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Over the next five years, the application of epoxy resins in the coatings sector will witness significant structural growth. As a core supporting material, the demand for curing agents will increase synchronously. The following analysis is conducted from three dimensions: application trends, driving factors, and demand forecast for curing agents. I. Application Trends of Epoxy Resin Coatings: Parallel Development of Environmental Upgrading and Application Scenario Expansion 1. Environmental Policies Drive Water-Based and High-Solid-Content Transformation Stringent global restrictions on VOC (Volatile Organic Compound) emissions (e.g., the EU REACH Regulation, China’s Emission Standards for Air Pollutants from the Coatings, Inks, and Adhesives Industry) are driving the transformation of epoxy resin coatings toward water-based and high-solid-content directions. Benefiting from its low-VOC characteristics, water-based epoxy resin coatings are seeing a rapid increase in penetration in fields such as building floors and industrial anti-corrosion. It is expected that the global water-based curing agent market will reach 1.36 billion US dollars by 2031, with a Compound Annual Growth Rate (CAGR) of 5.8%. Meanwhile, high-solid-content coatings, due to their high construction efficiency and excellent performance, are experiencing significant demand growth in large-scale infrastructure projects such as wind power equipment and bridges. 2. Explosive Demand in Emerging Fields Wind Power Equipment: Driven by the "dual carbon" policy (carbon peaking and carbon neutrality), China’s wind power installed capacity is expected to reach 650 GW by 2025. The demand for epoxy resin coatings for wind turbine blades will exceed 1.2 million tons, leading to a surge in the demand for anhydride-based curing agents. New Energy Vehicles: Scenarios such as battery pack protection and charging pile insulation have a strong demand for high-weather-resistance epoxy coatings. It is expected that the relevant market scale will exceed 5 billion yuan by 2025, with the annual demand for amine-based curing agents growing by 25%. Yueyang Zhongzhan Technology specializes in the production of amine-based curing agents and epoxy accelerators (DMP-30/K54). For inquiries, please contact us via phone or email: 13975090964. Electronic Packaging: The upgrading of the 5G base station and semiconductor industries is driving the demand for electronic-grade epoxy coatings. The market scale is expected to reach 8–10 billion yuan by 2025, with the proportion of latent curing agents rising to 15%. 3. Technological Iteration Toward High Performance and Functionalization Technological breakthroughs such as low-temperature curing (the curing agents produced by Yueyang Zhongzhan Technology can still cure at -5℃) and resistance to extreme environments (e.g., anhydride systems that withstand high temperatures of up to 180℃) will promote the application of epoxy resin coatings in high-end fields such as aerospace and hydrogen energy storage and transportation. At the same time, nano-modification technologies (e.g., graphene-reinforced coatings) can improve the wear resistance of coatings by more than 30%, further expanding application scenarios. II. Growth Logic for Curing Agent Demand: Resonance Between Market Expansion and Structural Upgrading 1. Market Scale Expansion Drives Basic Demand The global epoxy coating market is expected to grow from 39.549 billion US dollars in 2024 to 77 billion US dollars in 2030, with a CAGR of 4.99%. Assuming the dosage ratio of curing agents to epoxy resins is approximately 1:10 (dominated by amine-based types), the demand for curing agents will reach 770,000 tons by 2030. As a core growth engine, China’s epoxy coating market reached 124.978 billion yuan in 2024 and is expected to exceed 200 billion yuan by 2030, corresponding to a curing agent demand of about 200,000 tons. 2. Application Structure Upgrading Drives Demand for High-End Curing Agents Amine-Based Curing Agents: They will remain dominant (accounting for over 70%), but the proportion of high-performance modified amines (e.g., low-viscosity, low-toxicity products) will increase from 45% in 2024 to 60% in 2030, mainly driven by the automotive primer and wind turbine blade markets. For example, the high-temperature-resistant curing agent ZH150 produced by Yueyang Zhongzhan Technology can withstand temperatures up to 150℃, featuring excellent performance and has been applied in well-known automobile manufacturers. Anhydride-Based Curing Agents: Demand in the wind turbine blade and electronic packaging fields is surging. The market scale is expected to reach 1.5 billion yuan by 2030, with a CAGR of 12%. Bio-Based Curing Agents: Driven by sustainable development policies, the penetration rate of cashew phenol-based and other bio-based products will increase from 5% in 2024 to 15% in 2030, mainly used in green building coatings. 3. Intensified Regional Market Differentiation Creates Structural Opportunities The Asia-Pacific region (especially China) contributes over 60% of the global incremental demand, while the European and American markets focus more on high-endization and environmental compliance. For instance, the demand for anhydride-based curing agents for wind turbine blades in China grows by 18% annually, while the European automotive coatings market tends to prefer water-based amine-based curing agents. Emerging markets such as India and Southeast Asia, driven by accelerated industrialization, see an average annual growth of over 10% in epoxy coating demand, promoting the expansion of localized production capacity for amine-based curing agents. III. Quantitative Forecast of Curing Agent Demand and Risk Tips 1. Demand Forecast Model Baseline Scenario: Assuming a 5% annual growth rate of epoxy resin coatings and a 1:10 dosage ratio of curing agents to resins, the global demand for curing agents will increase from 550,000 tons in 2025 to 700,000 tons in 2030, with a CAGR of approximately 4.8%. Optimistic Scenario: If the demand for wind power and new energy vehicles exceeds expectations, coupled with the increased penetration of water-based curing agents, the CAGR could reach 5.5%, with demand hitting 750,000 tons by 2030. Pessimistic Scenario: If raw material price fluctuations or economic recession suppress investment, the CAGR may drop to 3.5%, with demand reaching around 650,000 tons by 2030. 2. Key Variables and Risks Raw Material Costs: Oversupply of bisphenol A may lead to low epoxy resin prices, stimulating coating demand but compressing profit margins; epichlorohydrin, affected by glycerol price fluctuations, may push up the cost of high-end curing agents. Technological Substitution: The risk of substitution by polyurethane and acrylic resins in some fields (e.g., automotive topcoats) should be watched, especially in price-sensitive markets. Overcapacity: The expansion of amine-based curing agent production capacity in China (e.g., Anhui Hengtai’s new 5,000-ton/year capacity) may intensify price competition. IV. Conclusion Over the next five years, driven by environmental policies, emerging industries, and technological upgrading, epoxy resin coatings will maintain steady growth, with a synchronous increase in curing agent demand. Amine-based curing agents will remain dominant, but anhydride-based and bio-based products will present significant structural opportunities in specific fields. Enterprises need to pay attention to risks such as raw material price fluctuations, regional market differentiation, and technological substitution, and seize opportunities through differentiated product layouts (e.g., low-temperature curing and high-solid-content systems) and capacity optimization (e.g., localized production in Southeast Asia). It is expected that by 2030, the global demand for curing agents for epoxy coatings will reach 650,000–750,000 tons, with China accounting for over 40% and becoming the world’s largest market.   Yueyang Zhongzhan Technology specializes in the production of amine-based curing agents and epoxy accelerators (DMP-30/K54). For inquiries, please contact us via phone or email: 13975090964.

The following explanation is divided into two aspects: 1. Principle of Use 650 polyamide curing agent is a low-molecular-weight polyamide produced by the reaction of fatty acid dimers with polyamines. Its molecular structure contains a large number of primary amino groups (-NH?) and secondary amino groups (-NH-), and these reactive amino groups can undergo a ring-opening addition reaction with the epoxy groups (-C-O-C-) in epoxy resins:   Primary amino groups first react with epoxy groups, opening the ring to form hydroxyl groups (-OH) and secondary amine structures; The generated secondary amino groups further react with other epoxy groups, continuing the ring-opening process and forming a cross-linked structure; Finally, through three-dimensional network crosslinking, the epoxy resin is transformed from a liquid state to a solid state, and at the same time, it is tightly combined with reinforcements (such as fibers, fabrics) in composite materials, endowing the materials with mechanical strength, chemical resistance and other properties. 2. Feeding Ratio The ratio is mainly calculated based on the epoxy equivalent weight (EEW) of the epoxy resin (millimoles of epoxy groups per gram of resin) and the active hydrogen equivalent weight (AHEW) of 650 polyamide (millimoles of active hydrogen per gram of curing agent). In practical applications, the mass ratio is often used for simplification:   For commonly used bisphenol A epoxy resins (e.g., E-44 with an epoxy equivalent weight of approximately 210-240; E-51 with an epoxy equivalent weight of approximately 180-200), the addition amount of 650 polyamide curing agent is usually 20%-40% (relative to the mass of epoxy resin). Example: 100 parts of E-51 epoxy resin mixed with 30-40 parts of 650 polyamide can cure at room temperature (curing time is about 24-72 hours), and the product has good flexibility; If it is necessary to accelerate the curing speed, a small amount of accelerator (e.g., DMP-30, with an addition amount of 1%-3% of the resin mass) can be added. In this case, the dosage of 650 polyamide can be appropriately reduced to 20-30 parts.   The specific ratio needs to be adjusted according to the composite material’s requirements for curing speed, hardness and flexibility. It is recommended to verify through experiments to match the actual process needs.   Yueyang Zhongzhan Technology produces 650 polyamide curing agent and DMP-30 epoxy accelerator, with stable quality that has been recognized by customers for many years. Welcome to inquire. Contact: 13975090964.

How to Determine the Exact Ratio of Epoxy Resin to Curing Agent in Waterborne Epoxy Paint in Practical Operations In practical operations, the exact ratio of epoxy resin to curing agent in waterborne epoxy paint needs to be determined comprehensively based on theoretical calculations, product characteristics, and actual working conditions. The core is to ensure complete reaction between the two and match performance requirements. Here are the specific steps and methods: I. Core Theoretical Basis: Matching Epoxy Equivalent Weight and Active Hydrogen Equivalent Weight Obtain Key Parameters Request the "epoxy equivalent weight (EEW)" of the epoxy resin from the supplier: the number of millimoles of epoxy groups per gram of resin (unit: mmol/g). For example, the EEW of E-51 waterborne epoxy is approximately 0.5-0.55 mmol/g. Obtain the "active hydrogen equivalent weight (AHEW)" of the curing agent: the number of millimoles of active hydrogen per gram of curing agent (unit: mmol/g). For example, the AHEW of waterborne polyamide 650 is approximately 0.3-0.35 mmol/g. Theoretical Ratio Calculation Following the principle of "total epoxy groups = total active hydrogen," the formula is: Curing agent mass = Epoxy resin mass × (Epoxy resin EEW ÷ Curing agent AHEW)   Example: For 100g of E-51 waterborne epoxy (EEW = 0.5 mmol/g) paired with a waterborne polyamide with AHEW = 0.33 mmol/g, the theoretically required curing agent mass = 100 × (0.5 ÷ 0.33) ≈ 151.5g (but in practice, it will be lower due to the influence of solvents in the waterborne system). II. Practical Operation Steps: From Reference to Verification Step 1: Start with the Supplier's Recommended Ratio Almost all suppliers of waterborne epoxy and curing agents provide a clear recommended ratio (e.g., "epoxy resin: curing agent = 100:30"). This is the optimal initial value based on product characteristics (already considering the impact of solvents and additives in the waterborne system on the reaction).   Example: A certain brand of E-44 waterborne dispersion recommends a ratio of 100:25-30 with waterborne T31 curing agent, which can be directly used as the starting point for testing. Step 2: Verify the Rationality of the Ratio Through Small-Sample Testing Prepare small samples with different ratios (adjusted within ±5% of the recommended range) and test key performances:   Test Item Test Method Qualification Criteria (Example) Curing completeness After curing at 25°C for 7 days, wipe the paint film surface with acetone for 30 seconds No stickiness, no dissolution marks Mechanical properties Test film hardness (pencil hardness tester) and adhesion (cross-cut test) Hardness ≥ 2H, adhesion ≤ Grade 1 Pot life Observe the system state after mixing and record the time from mixing to thickening/stratification Pot life ≥ 2 hours (meeting construction needs) Water resistance Immerse the paint film in distilled water for 24 hours No blistering, no peeling, no significant discoloration   If curing is incomplete (sticky) under a certain ratio, it indicates insufficient curing agent, and the ratio needs to be increased; If the paint film is too brittle (cracks in bending tests), it indicates excessive curing agent, and the ratio needs to be reduced. Step 3: Adjust the Ratio According to Working Conditions Construction temperature: Low-temperature environment (<15°C): Curing reaction slows down. The amount of curing agent can be appropriately increased (e.g., +5% of the upper limit of the recommended ratio), or 0.5%-2% of waterborne accelerator (such as waterborne DMP-30) can be added; High-temperature environment (>30°C): Reaction accelerates. The amount of curing agent needs to be reduced (e.g., -5% of the lower limit of the recommended ratio) to avoid brittle paint film. Substrate characteristics: Porous substrates (e.g., concrete, wood): Curing agent may be absorbed by the substrate, requiring an increase in dosage (+5%); Smooth metal substrates: The recommended ratio can be used to avoid reduced adhesion due to excess. Performance requirements: Pursuing high corrosion resistance (e.g., industrial anti-corrosion): Slightly excessive curing agent (+3% of the recommended ratio) to ensure sufficient cross-linking; Pursuing flexibility (e.g., wood coating): Slightly insufficient curing agent (-3% of the recommended ratio) to retain a small amount of unreacted epoxy groups for improved elasticity. III. Precautions Mixing uniformity: Waterborne systems are prone to demulsification due to ratio deviations. First, stir the epoxy resin evenly, then slowly add the curing agent and stir at high speed for 2-3 minutes (rotational speed 300-500 rpm). Batch consistency: Epoxy equivalent weight/active hydrogen equivalent weight may vary slightly between different batches of products. Small-sample testing should be repeated for each new batch of materials. Recording and iteration: Record each ratio and corresponding performance to form an "optimal ratio database" suitable for your own working conditions (e.g., in a workshop at 20°C, the ratio of E-51 waterborne epoxy + 650 waterborne polyamide at 100:32 achieves the best results).   Through the four steps of "theoretical calculation → supplier reference → small-sample testing → working condition adjustment," the ratio in practical operations can be accurately determined, ensuring a balance between paint film performance and construction efficiency.

What are the application scenarios of 2950 epoxy accelerator? ZH2950 epoxy accelerator (such as Huntsman Accelerator 2950 or Yueyang Zhongzhan Technology ZH2950) is a high-efficiency co-reactive accelerator. Its core function is to significantly shorten curing time and improve system performance by catalyzing the cross-linking reaction between epoxy groups and curing agents. Its application fields cover multiple industrial scenarios, as follows: I. Epoxy coatings and floor systems 1. Solvent-free epoxy coatings ?Application scenarios: Fields with strict requirements on VOC emissions, such as industrial floors, inner walls of storage tanks, and pipeline anti-corrosion. ?Advantages: ?Excellent low-temperature curing ability, enabling complete curing within 24 hours even at 5°C, suitable for winter construction or cold storage floors. ?When used with polyamide curing agents, it can increase curing speed by 30%-50% without significantly shortening the pot life. ?Typical case: For solvent-free epoxy coatings in ship ballast tanks, adding 1%-3% of 2950 can accelerate curing while maintaining coating flexibility and salt spray resistance. 2. Solvent-based epoxy coatings ?Application scenarios: Ship maintenance coatings (such as Araldite® GZ 7071 X 75 system), container coatings, and anti-corrosion paints for steel structures. ?Advantages: ?The pot life is approximately twice as long as that of traditional tertiary amine accelerators (such as DMP-30), facilitating large-area construction. ?At high dosages (e.g., 20 parts), it can cure quickly at 5°C, meeting the needs of emergency repairs. 3. Waterborne epoxy coatings ?Application scenarios: Environmentally friendly industrial coatings and architectural decorative coatings. ?Advantages: ?Excellent compatibility with waterborne amine curing agents, avoiding demulsification, and improving the initial water resistance and anti-corrosion performance of the paint film. ?The recommended addition amount is 5%-10% of the curing agent mass, which can shorten the surface drying time of waterborne epoxy to 2-4 hours at room temperature. II. Composite materials and adhesives 1. Composite material molding ?Application scenarios: Wind turbine blades, FRP products, and mold processing. ?Advantages: ?When used with polyamide or polyamine curing agents, it can reduce the viscosity of the resin system, promote fiber wetting, and improve the flexural strength and impact resistance of the cured product. ?It maintains high curing efficiency even in low-temperature environments (e.g., 5°C), reducing mold occupancy time. 2. Structural adhesives ?Application scenarios: Metal-to-metal bonding, electronic component packaging, and automotive part assembly. ?Advantages: ?Accelerates the curing reaction of epoxy-amine systems, enabling the shear strength to reach more than 80% of the maximum value within 24 hours. ?It can replace part of the curing agent dosage (e.g., reduce by 10%-20%), maintaining bonding performance while reducing costs. III. Polyurethane systems 1. Polyurethane adhesives and elastomers ?Application scenarios: Shoe material bonding, automotive interior parts, and industrial elastomers. ?Advantages: ?Adding 1%-3% can significantly shorten the demolding time (e.g., from 8 hours to 3 hours), improving production efficiency. ?Reacts with isocyanates to form urea bonds, enhancing the wear resistance and tear resistance of elastomers. 2. Polyurethane foams and coatings ?Application scenarios: Rigid polyurethane foam insulation materials and polyurethane waterproof coatings. ?Advantages: ?Catalyzes the trimerization reaction of isocyanates to form stable isocyanurate ring structures, improving the high-temperature resistance of foams (up to 150°C or higher). ?When compounded with foaming catalysts such as PC-41, it can adjust foam density and closed-cell rate. IV. Special industrial fields 1. Electronic packaging materials ?Application scenarios: Semiconductor packaging and circuit board potting. ?Advantages: ?Low odor and low toxicity, meeting the environmental protection requirements of the electronics industry. ?Promotes the curing of epoxy-anhydride systems and reduces dielectric loss (<0.005), meeting the needs of high-frequency electronic components. 2. Concrete repair materials ?Application scenarios: Bridge crack repair and airport runway emergency repair. ?Advantages: ?Can cure quickly on wet substrates, forming strong bonding with concrete substrates (tensile strength > 3MPa). ?It can be formulated into two-component epoxy mortar with a compressive strength of over 60MPa. V. Performance comparison and selection suggestions Performance indicator 2950 epoxy accelerator Traditional DMP-30 accelerator Low-temperature curing ability Completely cures within 24 hours at 5°C Curing slows down significantly below 10°C Pot life (solvent-based) Twice as long as DMP-30 Relatively short, about 2-3 hours Flexibility of cured product Not easy to become brittle, excellent yellowing resistance Prone to increased brittleness at high dosages Odor and toxicity Low odor, low VOC emissions Strong pungent odor Compatibility with water-based systems Excellent, not easy to demulsify Requires pre-emulsification, otherwise prone to stratification   Selection suggestions: ?Low-temperature environment: 2950 is preferred, as its curing efficiency at 5°C is more than 3 times that of DMP-30. ?Water-based systems: 2950 is the first choice to avoid demulsification caused by traditional accelerators. ?High-end coatings: If long-term weather resistance and aesthetics are required, 2950 has better yellowing resistance. VI. Usage precautions ? Ratio control: ? ?Epoxy systems: Calculate the theoretical dosage based on "epoxy equivalent weight/active hydrogen equivalent weight", usually 1%-5% of the resin mass. ?Polyurethane systems: The recommended addition amount is 0.5%-2% of the isocyanate mass; excessive dosage may cause foam shrinkage. ? Mixing process: ? ?2950 must be fully mixed with the curing agent first, then added to the resin, and stirred at high speed for 2-3 minutes (300-500r/min) to ensure uniform dispersion. ? Storage conditions: ? ?Store in a sealed container in a cool and dry place, avoid contact with water, and the shelf life is usually 12 months. ZH2950 epoxy accelerator produced by Yueyang Zhongzhan Technology, as an upgraded version of DMP-30, has passed SGS environmental certification and is widely used in shipbuilding, wind power, electronics and other fields. Welcome to call (13975090964) for customized solutions.

To determine the quality of the epoxy accelerator DMP-30 (2,4,6-tris(dimethylaminomethyl)phenol), a comprehensive evaluation can be conducted from aspects such as **appearance and physical property testing**, **chemical index analysis**, **application performance testing**, and **impurity and safety assessment**. The specific methods are as follows: ### **I. Appearance and Physical Property Testing** 1. **Appearance and State** - * *Normal Standard**: Colorless to light yellow transparent liquid, free of suspended matter or precipitation. - **Abnormality Judgment**: Dark color (such as tan), turbidity, or layering may indicate raw material oxidation, impurity residue, or deterioration due to improper storage. 2. **Odor** - **Normal Standard**: Characteristic amine odor (similar to ammonia or weak alkaline smell), without pungent stench or peculiar smell. - **Abnormality Judgment**: Strong rancid or putrid odor may indicate product decomposition or contamination. 3. **Density and Viscosity** - **Testing Method**: Measure using a densitometer or viscometer (such as a rotational viscometer), with reference to standard values (typically density: approximately 0.97–0.99 g/mL; viscosity: approximately 20–50 mPa·s/25°C). - **Quality Correlation**: Deviations from the standard range in density or viscosity may indicate unstable production processes or adulteration with other solvents. ### **II. Chemical Index Analysis** 1. **Amine Value (Key Index)** - **Testing Principle**: Determine the amino content through acid-base titration to reflect the active ingredient concentration. - **Standard Range**: Theoretical amine value is approximately **500–530 mgKOH/g** (purity ≥ 99%). - **Quality Judgment**: - Amine value close to the theoretical value: High purity and strong promoting effect. - Low amine value: May contain water, low-molecular impurities, or incomplete synthesis. 2. **Moisture Content** - **Testing Method**: Karl Fischer method (volumetric or coulometric method). - **Standard Requirement**: High-quality products have a moisture content ≤ 0.5% (some high-end products require ≤ 0.3%). - **Risk Warning**: Excessive moisture can cause emulsification in the epoxy resin system, affect curing effects, and even corrode metal substrates. 3. **pH Value** - **Testing Method**: Measure the pH of a 10% aqueous solution using a pH test strip or pH meter. - **Normal Range**: Alkaline, with a pH of approximately 10–12. - **Abnormality Judgment**: A pH lower than 9 (e.g., <9) may indicate the presence of acidic impurities or decomposition products, affecting the accelerator's activity. 4. **Purity and Impurities** - **Testing Method**: Analyze using gas chromatography (GC) or high-performance liquid chromatography (HPLC). - **Key Indicators**: - Main component (DMP-30) content ≥ 99%. - Impurities (such as free amines and phenolic by-products) ≤ 1%. - **Risk Points**: Impurities may cause abnormal curing speed, product discoloration, or degradation of mechanical properties. ### **III. Application Performance Testing** 1. **Curing Promotion Effect** - **Testing Method**: - Mix at a fixed ratio (e.g., 100 parts epoxy resin, 0.5–2 parts DMP-30) and observe the gel time (25°C). - High-quality products should control the gel time within **30–60 minutes** (specific time varies by epoxy resin type). - **Judgment Basis**: - Too short gel time: May contain excessive catalyst, leading to insufficient working time. - Too long gel time: Low accelerator activity, possibly due to insufficient purity or failure. 2. **Properties of Cured Products** - **Testing Items**: - **Mechanical Properties**: Tensile strength, flexural strength (refer to standards such as GB/T 2568 and GB/T 2567). - **Thermal Properties**: Glass transition temperature (Tg, DSC method), heat resistance (e.g., water resistance, aging resistance). - **Quality Correlation**: - High-quality accelerators should enable cured products to meet industry standards (e.g., tensile strength ≥ 30 MPa, Tg ≥ 60°C). - Significantly lower-than-expected performance may indicate poor compatibility between the accelerator and resin or cross-linking structure interference from impurities. 3. **Color Stability** - **Testing Method**: Age the cured epoxy resin sample under ultraviolet light or high temperature and observe color changes. - **Quality Requirement**: High-quality products should prevent yellowing or blackening of cured products, especially for light-colored or transparent products. ### **IV. Impurity and Safety Assessment** 1. **Heavy Metals and Harmful Substances** - **Testing Items**: Lead (Pb), mercury (Hg), cadmium (Cd), etc. (refer to RoHS and REACH regulations). - **Application Scenarios**: For applications in food contact, medical, and other fields, strict control of harmful impurities is required (e.g., Pb ≤ 10 ppm). 2. **Storage Stability** - **Testing Method**: Store the sample at 50°C for 7 days and observe changes in appearance and amine value. - **Quality Requirement**: Qualified products should show no obvious discoloration or layering, with an amine value decrease ≤ 5%. ### **V. Reference Standards and Supplier Qualifications** 1. **Implementation Standards**: - Domestic reference: General requirements for amine-based curing agents in HG/T 4883-2016 *Amine Curing Agents for Epoxy Resins*. - International reference: ASTM D2073 *Standard Test Methods for Amine Curing Agents*. 2. **Supplier Qualifications**: - Request a COA (certificate of analysis) and MSDS (material safety data sheet) , focusing on amine value, moisture, and purity data. - Prioritize manufacturers certified under the ISO 9001 quality management system to reduce batch stability risks. ### **Summary: Quick Judgment Steps** 1. **Preliminary Screening**: Observe appearance and odor, measure density/viscosity, and eliminate obviously abnormal products. 2. **Core Testing**: Commission third-party testing agencies to determine amine value, moisture, and purity (GC/HPLC). 3. **Application Verification**: Test curing speed and product performance through small samples to ensure they meet actual requirements. For extremely high-quality requirements (e.g., aerospace, electronic packaging), long-term aging tests and toxicological evaluations are recommended to avoid potential risks.

What is polyamide curing agent 3115? Polyamide curing agent 3115 is a high molecular weight epoxy resin curing agent with the following characteristics and application fields: -* * Characteristics** -High viscosity: Its viscosity is ≥ 100000pps at 25 ℃, appearing as a light yellow or orange red transparent viscous liquid. -* * Excellent Performance * *: It has excellent water resistance, corrosion resistance, bonding performance, good wettability to color and substrate, and excellent chemical resistance. -* * Longer applicable period * *: After mixing with epoxy resin, it has a longer applicable period and can meet certain construction operation time requirements. -Low comprehensive cost: Stable price, good compatibility with resin, no need for curing, can reduce usage costs and operational difficulties. -* * Technical indicators** -Amine value: 200-220mgKOH/g. -Density: 0.97 ± 0.01 at 25 ℃. -Chromaticity: Orange red. -* * Active hydrogen equivalent * *: 175. -Recommended dosage: For liquid epoxy resin (EEW=190), the recommended dosage per 100 parts of epoxy resin is 100: （80 - 100）。 -* * Application Fields** -Ship anti-corrosion coating: It can provide good anti-corrosion protection for ships and resist the erosion of seawater, sea breeze, etc. -Pipeline anti-corrosion: It can be used for anti-corrosion coating on the surface of pipelines to extend their service life. -* * Bonding, joint filling, grouting, etc. * *: It has good bonding performance and can be used for bonding, joint filling, and grouting operations of various materials, such as repairing and sealing building structures.

What are the raw materials for polyamide curing agent 3115 and what are their respective proportions? Polyamide curing agent 3115 is typically synthesized from a dimer of vegetable oleic acid and ethylene amine. But the specific proportion of raw materials is usually a technical secret of the enterprise and is generally not fully disclosed. According to the general synthesis principles and related research of some polyamide curing agents, the raw materials and general situation involved are as follows: -* * Dimer acid compounds * *: such as dimer acids obtained by mixing one or more of soybean oil fatty acids, cottonseed oil fatty acids, rapeseed oil fatty acids, tall oil fatty acids, etc. in any proportion and polymerizing. In the synthesis of polyamide curing agents, dimer acid compounds generally account for a large proportion, possibly around 50% -70% (by weight). -Amine compounds: Common ones include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, etc. They are generally used as raw materials for reacting with dimer acids, and form polyamide structures through condensation reactions between amine groups and carboxyl groups of dimer acids. Its proportion may be around 30% -50% by weight. Different manufacturers may make appropriate adjustments to raw materials based on product performance requirements, resulting in differences in the proportion of raw materials.

What accelerators and curing agents are used in epoxy asphalt anti-corrosion coatings? The commonly used accelerators and curing agents in epoxy asphalt anti-corrosion coatings are as follows: accelerator DMP-30 (2,4,6-tris (dimethylaminomethyl) phenol) 6: is a commonly used epoxy accelerator. It is a colorless or light yellow viscous liquid that is soluble in alcohols, benzene, acetone, and cold water. In epoxy asphalt anti-corrosion coatings, it can effectively accelerate the curing reaction speed and shorten the curing time. The recommended dosage is generally 3% -15% of the epoxy curing dose. As the dosage increases, the curing speed accelerates, but the brittleness of the cured material may increase. curing agent Polyamide curing agent: The molecular structure contains flexible fatty acids and active amine groups. When mixed with epoxy resin, the curing reaction is mild and has a long usable time. The epoxy resin cured with it has good toughness, and the amount of polyamide resin added can be adjusted greatly. The relative weighing accuracy requirement is not very strict. Meanwhile, polyamide curing agents are actually non-toxic, and the epoxy resin cured with them is non-toxic and can be applied in the food industry. Polyamine curing agent: With high reactivity, it can cure epoxy asphalt coatings at room temperature or lower temperatures. For example, fatty amine curing agents such as ethylenediamine and diethylenetriamine have fast curing speeds, but they have relatively high irritant odors and toxicity; Aromatic amine curing agents such as meta phenylenediamine have good heat resistance and mechanical properties, but the curing temperature is higher and the curing time is longer. Phenolic curing agent: It has good heat resistance and chemical corrosion resistance. The cured coating can maintain good performance in high temperature and chemical corrosion environments. However, its curing process is relatively complex and may require higher curing temperatures and longer curing times. Anhydride curing agent 4: such as phthalic anhydride, maleic anhydride, etc. When acid anhydride reacts with epoxy resin, it usually needs to be carried out at a higher temperature. The cured product has good heat resistance and mechanical properties, and its chemical corrosion resistance is better than that of amine curing agents. Which company produces DMP-30 with the best cost-effectiveness? The DMP-30 produced by Yueyang Zhongzhan Technology has a quality standard far exceeding the national standard, and its performance surpasses that of some foreign brands. Those who have used it all say good. Which company produces the most cost-effective polyamide curing agent? Polyamide curing agent, brand 650651, is the main brand produced by Yueyang Zhongzhan Technology, with excellent quality and price, and worry free after-sales service. Hurry up and make a phone call to ask: 13975090964

What are the accelerators for epoxy resin powder coatings? In epoxy resin powder coatings, the function of accelerators is to speed up the curing reaction rate, lower the curing temperature, or shorten the curing time. The following are common types of accelerators: Amine-based accelerators Tertiary amines: Such as triethylamine, triethanolamine, 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30), etc. Triethylamine can accelerate the reaction rate between epoxy resin and acid anhydride curing agents; DMP-30 is a highly active accelerator that can be used in curing systems such as epoxy-acid anhydride and epoxy-phenolic. It can significantly reduce the curing temperature and shorten the curing time. Imidazoles: Such as 2-methylimidazole, 2-ethyl-4-methylimidazole, etc. These accelerators have high activity and are used in small amounts, and they have good accelerating effects on curing systems such as epoxy-dicyandiamide and epoxy-acid anhydride. For example, in the epoxy-dicyandiamide system, 2-methylimidazole can make the curing reaction proceed rapidly at a relatively low temperature. Organometallic compounds Organotin compounds: For example, dibutyltin dilaurate, stannous octoate, etc. Dibutyltin dilaurate is commonly used in epoxy-polyester powder coatings. It can promote the reaction between the carboxyl groups in the polyester resin and the epoxy groups in the epoxy resin, accelerate the curing process, and improve the cross-linking density and performance of the coating. Organozinc compounds: Such as zinc naphthenate, zinc octoate, etc. They can be used as accelerators for the epoxy-acid anhydride curing system, reducing the activation energy of the curing reaction and making the reaction easier to occur. Quaternary ammonium salts and quaternary phosphonium salts Quaternary ammonium salts: Such as tetramethylammonium chloride, tetrabutylammonium bromide, etc. These accelerators can promote the curing reaction of epoxy resin through ionic action and can play a role in accelerating the curing in some epoxy-amine curing systems. Quaternary phosphonium salts: For example, ethyltriphenylphosphonium bromide. It has good thermal stability and shows excellent accelerating effects in high-temperature curing powder coating systems, improving the curing rate and performance of the coating. Other accelerators Borides: Such as boron trifluoride monoethylamine complex. It is a strong Lewis acid and has a strong accelerating effect on the curing of epoxy resin. It is commonly used in curing systems such as epoxy-amine and epoxy-phenolic. However, when using it, attention should be paid to controlling the dosage to avoid affecting the performance of the coating. Yueyang Zhongzhan Technology specializes in the production of epoxy accelerators DMP-30/K54. The product quality far exceeds the national standards. The production process is mature, and the product performance is excellent. Epoxy coating production enterprises are welcome to establish long-term and friendly cooperation with us directly. Contact person: Ms. Kim Xie Mobil/Whatsapp: 008613975090964