Hydroxyl alkyl amide (HAA) coating crosslinking agent

Hydroxyl alkyl amide (HAA) coating crosslinking agent,HAA hydroxyl alkyl amide class is the floorboard of the crosslinking agent, instead of TGIC HAA started in 2003 to become the world's first big weatherability powder coating crosslinking agent.

The two basic varieties on the market today, they are: 1) N, N, N % N % - four [- hydroxyethyl] adipic acid [N, N, N % N % - tetrakis (-) hydroxylethyl adipamide] 2) N, N, N % N % - four [-- hydroxypropyl] adipic acid [N, N, N % N % - tetrakis (- hydroxylpropyl) adipamide] Primid crosslinking mechanism is its hydroxyl alkyl group and the esterification reaction between polyester carboxyl, water is a by-product reaction.

Between hydroxyl alkyl amide and carboxyl reaction activity is the cause of formation of the intermediates of mouth oxazoline salt structure, end carboxyl polyester and esterification reaction between the hydroxyl alkyl amide is the intermediate oxazoline salt through the mouth, don't need a catalyst or accelerator.

XL552 and chemical structure on the only difference between QM1260 is the second product is in the position of hydroxyl additional methyl. Both Primids is white crystalline solid melting point around 120 ?.

The main difference is in the heated directly with a gas stove, QM1260! Good colour retention and change into the hydrolytic stability. From the perspective of toxicology Primid is completely safe, don't be labeling of recognized non-toxic raw materials.

With polyester and hydroxyl alkyl amide as basic material of powder coatings in crosslinking reaction are the main disadvantages of split water bubble formation, when they cause pinhole and foaming in coating thickness range. Slow down the crosslinking reaction can improve the degassing, namely in a long time to maintain a low melt viscosity. So far still think Primid polyester powder coating reaction is not adjusted.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine Raw material ：

TDA industrial, Sichuan production

Ethylene (Et) polymer grade, Shanghai production

TEA industrial imports

A reagent grade additives


Their latest hydroxyl alkyl amide crosslinking agent PrimidSF4510! . Because of its gelling time is longer and unique rheological properties, make it has extremely good mobility, improved degassing behavior, particularly suitable for high gloss powder coating, the exhaust (porous) base material such as aluminum and hot dip galvanized coating on steel and used for coating thickness. PrimidSF4510 can be seen as the outdoor durability of liquidity of powder coatings with excellent crosslinking agent.

Because of TGIC toxicity and harm to the environment, since the 1990 s, many countries have banned or restricted in the world for its application. Appeared in the powder coatings industry and its many alternatives, in which performance is close to TGIC, affect the largest and the most widely application scope for hydroxyl alkyl amide (Primid XL552).

To promote the hydroxyl alkyl amide (T105) you have to research its differences with TGIC. T105 is through its three epoxy group and carboxyl polyester carboxyl reaction of curing, its reactivity is relatively small, there is no by-product in the process of reaction. Although nitrogen molecules containing three atoms, but closed triazine ring, make it stability without the structure of oxidation. And it is oil soluble, has good compatibility with carboxyl polyester.

T105 is through its four hydroxyl and carboxyl polyester carboxyl reaction of curing, its reactivity is opposite bigger, reaction process with water. Contains two bare nitrogen atoms in molecules, making it more easily oxidized and lose stability. And it is water soluble, and carboxyl polyester completely incompatible, only scattered in the carboxyl polyester.

By contrast can be seen in the above, in addition to the T105 has bad compatibility with carboxyl polyester should strengthen outside mixing dispersion on processing technology, in fact, there are two big quality problem: due to the reaction process with water generated easy forming pinhole and surface defects; Due to the bare a nitrogen atom and yellowing. And this two problems can be properly solve through the selection of the resin.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com