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Crosslinking agent for HAA powder coatings
2017-7-3 23:23:44
Crosslinking agent for HAA powder coatings
In recent years, powder coating (powder) in 4 e (environmental protection, economy, efficiency and performance excellence), as an alternative to solvent-based paint main step by step, also become the largest applications in household appliances.
But with the people understanding of environmental protection and health, electrical home appliances with powder coating gradually to promote environmentally friendly direction development, this article focus on home appliances using environmentally friendly polyester/primid (HAA) (also called HAA) powder system.
There are three main systems for the use of household appliances: epoxy/polyester blended system, weathering polyester/TGIC system, weathering polyester/basic d system, and a small number of weathering polyurethane and acrylic systems. Among them, the environment-friendly weather - resistant polyester/primile d system HAA has been a hot issue in the global focus on the replacement of non-environment-friendly resistant polyester/TGIC systems.
The impetus for the HAA replacement. Three different melamine urea acid glycidyl ester (TGIC) is one of the earliest used in outdoor powder curing agent, its three epoxy group has high activity, high crosslinking density, and molecular shelf of triazine heterocyclic structure rigidity, the coating has good weatherability, heat resistance and hardness.
But TGIC of stimulus to human skin, eyes and irritability, can make the animal cells induced, changing some structures of the gene, and this change is heritable, according to the eu in 1998 of TGIC in-depth toxicological research, decided to conduct regulation of TGIC powder and labeled poison, so provide space for the development of other systems.
And so in 2000, basically solved the new substitute crosslinking agent of beta hydroxy alkyl amide (HAA) some key technology problems, especially tailored a series of coordinated polyester, polyester/TGIC is first appeared in Europe has fallen dramatically. But in some emerging countries, TGIC is still the preferred hardener. The reason is that although HAA has made great progress, many problems have not been solved properly.
As the global attention to the problems of chemical safety and health, comply with the REACH regulation, Germany GS certification, requirements, such as the United States the CPISA act of TGIC toxicity and replace technology development needs to cause enough attention.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Along with our country's "clean production promotion law" promulgated, the required production enterprises continued to improve the design, use of clean energy and raw material, adopt advanced production technology and equipment, improve management, to reduce pollution from fountainhead, eventually need to reduce or eliminate the harm to human health and the environment.
The growth of HAA curing agent in China is stable, and the average growth rate is 10% higher than that of TGIC curing agent.
Beta hydroxy alkyl amide is a compound containing many hydroxyl groups, low toxicity, mouse oral LD50 was only 1/20 of TGIC), no stimulation, no mutagenic, and thus reflects the friendly to environment and human health are relatively obvious. Because its hydroxyl is in beta position, it is affected by N atom, and has four functional groups, and the activity is very high, and the curing temperature is significantly reduced.
The methods of synthesizing beta-hydroxyalkylamide mainly include:
(1) the direct reaction of diyuan acid with hydroxyalamine was used to obtain a mixture of amide and ester.
(2) using hydroxyalcohol amine and ethylene oxide or chlorinated alcohol, the method can obtain high purity products. But the epoxy ethane is low and unsafe;
(3) using alkyl ester and hydroxyl, under alkali catalytic reaction, which is the main method of synthesis of beta hydroxy alkyl amide both at home and abroad, the initial production rate is not high, by-products, through technology improvement, the yield and purity are improved better.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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