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.

The T31 curing agent is a commonly used epoxy resin curing agent. The following are its main components and uses: Main components: The main component of the T31 curing agent is phenolic amine, which is made through a polycondensation reaction of phenol, formaldehyde, ethylenediamine, etc. This complex structure endows the T31 curing agent with unique properties. Main uses: In the coating field: In coatings, the T31 curing agent can undergo a cross-linking reaction with epoxy resin to form a tough, wear-resistant, and corrosion-resistant coating. It is widely applied to anti-corrosion coatings in fields such as ships, bridges, and buildings, and can effectively protect the surface of objects from the erosion of the external environment. In the adhesive field: As a curing agent for epoxy resin adhesives, the T31 can endow the adhesives with good bonding strength and water resistance, and can be used for bonding various materials such as metals, ceramics, and glass. In the composite material field: When manufacturing composite materials, the T31 curing agent can enable better combination between the epoxy resin matrix and fiber-reinforced materials, improve the mechanical properties and stability of the composite materials, and is commonly used in fields such as aerospace and automotive manufacturing. In the electrical insulation field: The epoxy resin cured by the T31 curing agent has good insulation performance and can be used for insulation potting and insulation coatings of electrical equipment to ensure the safe operation of electrical equipment.

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.

Yueyang Zhongzhan Technology has obtained EcoVadis global certification and taken sustainable development to a new level Recently, Yueyang Zhongzhan Company was awarded a bronze medal rating by the international authoritative enterprise sustainable development evaluation platform EcoVadis for its performance in the field of sustainable development and fulfilling social responsibility practices, and its comprehensive score far exceeds the global average score of enterprises, marking a new level of sustainable development for the company. EcoVadis certification is one of the most authoritative evaluation systems in the global field of corporate social responsibility and sustainable development. Its certification assessment covers four core areas: environment, labor and human rights, business ethics, and sustainable procurement, aiming to promote continuous improvement of corporate social responsibility performance. Yueyang Zhongzhan Technology has demonstrated its practices in energy conservation and emission reduction, resource recycling, employee rights protection, and supply chain management during the certification process, and has been recognized by global authoritative institutions. As a leading provider of epoxy curing agents, accelerators, polyurethane additives, and catalyst solutions in China, Yueyang Zhongzhan adheres to innovation leadership and green development strategies. The company has strengthened the construction of the "ISO Quality Management System" and accelerated the domestic and international market layout of epoxy curing agents, accelerators, and key polyurethane additives. It not only maintains a leading position in the field of epoxy curing agents and accelerators, but also is committed to the research and application of anti-corrosion and acid resistant technology for automotive and marine coatings. It provides customized products for many well-known enterprises in China, solves and overcomes technical difficulties, and achieves the transformation and upgrading of standardized product supply to comprehensive customized solutions. Yueyang Zhongzhan Technology will take EcoVadis certification as an opportunity, guided by the concept of green technology development, further improve its social responsibility management system, continuously enhance its sustainable development capabilities, provide customers with more environmentally friendly and efficient solutions, provide new momentum for the sustainable development of the industry, and contribute Chinese wisdom to achieving the global "dual carbon" goal.  

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 

  Zhongzhan Technology Helps Well-known car enterprise Overcome Coating Technical Challenges and Unveils a New Chapter of Collaboration​ After more than a year of unremitting efforts and over a dozen sample improvements and deliveries, under the leadership of General Manager Yu Zhiliang and Technical Director Engineer Liu, the team of Zhongzhan Technology has successfully assisted Well-known car enterprise in overcoming the technical challenges of automotive coating anti-corrosion and acid resistance. This technological breakthrough not only demonstrates Zhongzhan Technology's profound expertise and innovative capabilities in the field of coating technology but also enables the company to smoothly become a supplier of coating additives for Well-known car enterprise Group, marking an important milestone in the cooperation between the two parties. The achievement of this result is a major victory for Zhongzhan Technology and also indicates that the company has taken a solid step in the field of automotive coating technology services. Zhongzhan Technology sincerely welcomes enterprises and individuals who have problems in coating anti-corrosion and acid resistance technology and need professional technical guidance to come for exchanges and cooperation. With advanced technology and rich experience, Zhongzhan Technology can provide customized production services according to the diverse coating needs of different customers, and tailor high-quality coating solutions for clients.​

Focus on epoxy amine additives (curing agents, promoters, etc.) research and development, production and management