Overview
Diamine curing agents are organic compounds containing two amine groups (–NH₂) that react with epoxy resins to form rigid, cross-linked polymers. They are widely used in industries requiring durable coatings, adhesives, or composite materials. Common types include ethylenediamine (EDA) and m-phenylenediamine (MPDA). These agents enable controlled curing at room or elevated temperatures, making them versatile for applications ranging from aerospace to construction. Their selection depends on factors like pot life, mechanical strength, and chemical resistance required for the final product.
Physical and Chemical Properties
Diamine curing agents typically exhibit low to moderate viscosity, facilitating easy mixing with epoxy resins. Their reactivity stems from primary amine groups, which form covalent bonds with epoxy groups. For example, EDA has a molecular weight of 60.1 g/mol and a boiling point of 116°C. Solubility in water and polar solvents like ethanol allows for formulation flexibility. However, their hygroscopic nature necessitates dry storage to prevent premature reactions. Key parameters like amine value (mg KOH/g) and equivalent weight determine curing efficiency and stoichiometric ratios.
Main Applications
In coatings, diamine hardeners enhance corrosion resistance for marine and industrial surfaces. They are critical in adhesives for automotive and aerospace assemblies due to high bond strength. Composites, such as carbon fiber-reinforced plastics, rely on these agents for matrix stabilization. Electrical encapsulants use diamines for insulation properties, while civil engineering employs them in grouts and sealants. Modified versions (e.g., polyetheramines) offer flexibility for niche applications like flexible coatings or impact-resistant materials.
Safety and Storage
Diamine curing agents are corrosive and may cause skin burns or respiratory irritation. Proper PPE—nitrile gloves, goggles, and fume hoods—is mandatory. Spills should be neutralized with acids (e.g., vinegar) and absorbed inertly. Storage requires airtight containers in cool (15–25°C), moisture-free environments. Shelf life ranges from 6–24 months, depending on the formulation. Inhibitors like benzyl alcohol may be added to extend stability for B2B bulk procurement.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO-certified production and batch-specific COAs (Certificates of Analysis). Key specs include amine value (200–500 mg KOH/g), viscosity (5–200 cP), and color (APHA <100). Bulk pricing negotiates at >1-ton quantities, with discounts for long-term contracts. Regional regulations (e.g., REACH, TSCA) must be verified. Alternatives like cycloaliphatic amines offer lower toxicity but higher costs—evaluate trade-offs per application needs.
Related Manufacturers
- 主营：磷酸三甲苯酯、氨基甲酸乙酯、磷酸甲苯二苯酯、双吗啉、甲乙酮肟、四乙基溴化铵、碳酸二丁酯、环烷酸铅、亚硫酸铵、二苯甲酮腙、石油磺酸钠、三乙醇胺、甲醇、乙醇、二甲苯、二氯甲烷、环烷酸铜、氨基甲酸甲酯、单过硫酸氢钾、氯化石蜡、三异丙醇胺、苄基三甲基氯化铵、苄基三乙基氯化铵、四乙基氯化铵、四甲基氯化铵、新癸酸铋
- 主营：聚苯胺、脯氨酸甲酯盐酸盐、苄基三甲基氯化铵
- 主营：双吗啉基二乙基醚、高铁酸钾
- 主营：环戊酮、甲酸镍、阻燃剂、双吗啉基二乙基醚、草酸镧、钼酸铵、催化剂、钒酸铋、溴氨酸、硝酸锆、碳酸镧、白僵菌、磷酸铁、钨酸酐、氟化镧、视黄醇、叔丁醇、杀螨剂、杀虫剂、醋酸钬、抗粘剂、氟化镥、肟菌酯、氢化钠、氯铂酸、氟化镁
- 主营：阻燃剂、催化剂、洗涤剂、硫酸铵、醋酸镧、起泡剂、清洗剂、碳酸钙、抗氧剂、灭火剂、交联剂、粘合剂、封头剂、丙二醇、酸二氢铝、聚乙烯醇、对氯溴苯、生物试剂、息香乙醚、异戊二醇、香精香料、4-丁二醇、2-氯丙烯腈、2-己基癸酸、二甲胺硼烷
- 主营：活化粉、厚涂助剂、催化剂、潜固化剂、扩链剂、流平剂、消泡剂、分散剂、防沉剂、触变剂、附着力促进剂、塑胶跑道技术支持、粘结胶技术支持
- 主营：丙烯酸、醋酸丁酯、桶装散水、双吗啉二乙基醚、醋酸甲酯、醋酸乙酯、碳酸乙烯酯、醋酸正丙酯
- 主营：uv结构胶、弹性垫圈、导电银胶、双85环氧灌封胶、环氧导热胶
- 主营：发热板、甘氨酸、阻燃剂、双吗啉基二乙基醚、深铬黄、胶黏剂、十八酸、正癸酸、羊脂酸、锂电池、光电极、消泡剂、丙酸铵、珠光片、油墨涂、赖氨酸、消光剂、水镁石、稀释剂、酸性红、羟乙基、梧桐胶、黄蜂蜡、abs树脂、铝钙石、脂肪酶
- 主营：乙酸镁、阻燃剂、热熔胶、聚合物、锂电池、光电极、泡泡糖、氯丁胶、碳酸镉、新癸酸、补差价、稀释剂、羟乙基、氧化铝、氧化铜、甲酸钾、c/c材料、碳酸锰、玻璃粉、硬光油、防腐剂、氧化铋、防水剂、聚丙烯、增粘树
- 主营：硫酸钡、覆盆子酮、胍基丙酸、早强防冻剂、食品级磷酸镁、二肌酸苹果酸、苯基膦酰二氯、食品级硫酸镁、二肌酸柠檬酸
- 主营：聚氨酯催化剂、二甲基苄胺、有机锌、双吗啉基二乙基醚、dmaee、dmdee、三聚催化剂、反应型催化剂、有机锡
- 主营：钢结构、久奈漆、汽车漆、固化剂地坪、氟碳漆、环氧防腐、环氧富锌、防锈底漆、醇酸防锈、聚氨酯桔、环氧清漆、红丹防锈漆、沥青防腐漆、聚氨酯磁漆、水性丙烯酸、醇酸调和漆、马路划线漆、丙烯酸磁漆、聚氨酯底漆、环氧导静电、硅酸锌底漆、磷酸锌底漆、丙烯酸底漆、丙烯酸彩瓦、氯化橡胶面漆、聚氨酯铝粉漆
- 主营：划线漆、道标识线
- 主营：地坪漆、环氧地坪漆、自流平地坪漆、自流平面漆、环氧彩砂面漆、环氧自流平面漆、聚氨酯罩面清漆、环氧富锌底漆、防锈漆、防腐漆、环氧云铁中间漆、氟碳面漆、金属氟碳漆、重防腐涂料、氟碳漆、丙烯酸聚氨酯面漆、氯磺化聚乙烯漆、玻璃鳞片胶泥、环氧腻子、环氧煤沥青漆