Hydroxyl alkyl amide coating crosslinking agent

Hydroxyl alkyl amide coating crosslinking agent,Hydroxyl alkyl amide of HAA again, it is one of the outdoor polyester resin crosslinking agent. Long TGIC (different cyanuric acid three glycidyl ester) as a crosslinking agent widely used powder coating, but because of TGIC has high potential genetic toxicity and irritation, 2011 national ministry for inclusion in the backward production technology and equipment and products.

Therefore hydroxyl alkyl amide type powder coatings will gradually become almost the only choice of outdoor weatherability powder coating. For this crosslinking agent in the use of the matters needing attention in the process of listed below:

Resin matching problem. Due to the low activation energy hydroxyl alkyl amide, therefore cannot use the traditional TGIC with carboxyl polyester, and to choose special polyester hydroxyl alkyl amide.

Coating of pinhole yellowing problem. Hydroxyl alkyl amide and carboxyl polyester crosslinking reaction with water, easy to produce pinhole coating, unfavorable and thick coating, formula of degassing agent 0.4%, appropriate coating thickness of 90 microns below, there would be no pinhole.

Sensitive hydroxyl alkyl amide of benzoin, white or other powder coating preparation should avoid benzoin and its mixture to do light color powder need to add 0.8% of antioxidant B900.

Powder on the absorption of moisture problem. As water-soluble hydroxyalkyl amide fine, when using the storage and made of waterproof, moistureproof, should be paid attention to when the finished powder powder formula does not need to increase electric agent or alumina, but you can type plus R972 hydrophobic silica. Powder after moisture absorption on the poor, the coating adhesion is poor.

Melt mixing crosslinking. Hydroxyl alkyl amide system with other system of the manufacture of powder processing method is basically the same, but in order to strengthen the dispersivity of the hydroxyl alkyl amide, extrusion temperature should be slightly higher, at about 115-120 ℃, recommended as crosslinking temperature 180 ℃ for 15 minutes.

Coating by four basic components: commonly film-forming material (resin, emulsion), paint (including inert pigment), solvents and additives (fertilizer).

1 film forming material is the main element of the film, including grease, oil processing products, cellulose derivatives, natural resin, synthetic resin and synthetic latex. Film-forming material also includes some nonvolatile reactive diluent, it is to make the coating firmly attached to the coated surface form a continuous film, the main material is the foundation of a coating, determines the basic characteristics of coating.




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


2 additives such as antifoaming agent, leveling agent, etc., and some special function additives, such as substrate wetting agents, etc. These additives are generally not film-forming and adding quantity is little, but the basic material to form coating process and durability plays a quite important role.

3 pigment generally divided into two kinds, a kind of pigments, common titanium pigment, chrome yellow, etc., and for inert pigment, which is often said that the packing, such as calcium carbonate, talcum powder.

4 including hydrocarbon solvent. Solvent (mineral oil, kerosene, gasoline, benzene, toluene, xylene, etc.), alcohols, ethers and ketones and esters. Solvent and water is the main function of scatter film-forming binders to form a viscous liquid. It is helpful to the construction and improvement of some of the performance of coating.

According to the coating used in the main film forming material coating can be divided into oily coating, fiber coating, composite coating and inorganic coating; According to the coating or paint film properties can be divided into solution, emulsion, sol, powder, there is light, extinction and the colorful art paint, etc.

The coating is one of the new trend for the development of imitation stone paint research and application. Imitation stone paint is through the coating to imitate true stone adornment effect, more energy conservation and environmental protection, and more safety, also known as the liquid rock. Which include water bag, water bag colorful coating sand and colorful coating, fluorocarbon lacquer and so on. Because of its lower cost, adornment effect is more and more safe and widely used in the market.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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