Research on microdiameter coating crosslinking agent

Research on microdiameter coating crosslinking agent.Is the use of laser granulometer particles of light scattering measurement of particle size (diffraction) phenomenon, namely the light in the process, encounter particles (obstacles), there will be a part of the deviation from the original direction of propagation, the smaller the particle size, the smaller the deviation vector. By means of laser granulometer, the measurement of the size of particle size before and after the cross-linking agent was modified.

According to GB/T 1731-1993, the film is flexible. Level 1: axis bar 35mm * 10mm * (1 + + 0.1) mm, curvature radius (0.5 + + 0.1) mm; Level 2: axis bar 35mm * 10mm * (2 + + 0.1) mm, curvature radius (1 + + 0.1) mm; The shaft bar 35mm * 10mm * (3 + + 0.1) mm, the radius of curvature (1.5 + + 0.1) mm.

Under the condition of 180 ℃ * 17 min film impact strength is not high, flexibility is very poor, the reason is that the epoxy crosslinking agent under the condition with epoxy cross-linking, and impact strength over 50 formula 2 in this condition, flexibility is good, its performance is superior to the formula 3 (after adding chemical surfactant crosslinking agent).

Epoxy crosslinking agent when the temperature reaches 200 ℃ * 15 min, crosslinking agent with epoxy crosslinking, its impact strength 50 s, while the impact strength of modified epoxy crosslinking agent of 40, but the flexibility with the formula 3, this may be due to high temperature and baking time.

The modified epoxy crosslinking agent can shorten the crosslinking time, and the effect is better than the catalyst before modification. At the same time, also found that the appearance of the epoxy modified before and after the coating has obvious changes, both at 180 ℃ and 200 ℃, its flow leveling effect is better than before modification coating effect.

This is due to the melting point of epoxy crosslinking agent is as high as above 200 ℃, the melting temperature of epoxy resin has been rapid crosslinking, crosslinking agent and epoxy hybrid implementation in the form of the former suspended. The relative density of epoxy crosslinking agent is greater than that of epoxy resin, the size of its size and the speed of crosslinking are closely related.




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


Of the modified epoxy crosslinking agent effectively decrease the temperature of the crosslinking system, improve the crosslinking rate and dispersion, and shrink short crosslinking time, improve the coating flow property.

Modified polyester crosslinking agent at 180 ℃ can completely crosslinking, the crosslinking temperature significantly below before modification of catalyst after crosslinking agent crosslinking temperature, this may be due to cross-linking agent by physical modification, the powder surface activated, its activity increases, the surface active points or reactive activity can significantly reduce, make the crosslinking effect is better than adding chemical activator; After reducing the size of the crosslinking agent, the combination of the polyester and the polyester was enhanced.

After the modification of crosslinking agent, the surface conditions of different powder coatings were improved, and the surface gloss increased. The crosslinking temperature of the crosslinking agent was significantly lower than the crosslinking temperature of the chemical active agent.

In powder coating, the crosslinking particle size of crosslinking agent has obvious effect on the crosslinking temperature and surface of the coating. The smaller the particle size, the lower the crosslinking temperature, the better the surface flow of the coating, and the decorative performance of the coating on the workpiece.

The microparticle diameter crosslinking agent can obviously improve the mechanical properties of powder coating, which is more favorable to the crosslinking of powder coatings. Not only the low temperature crosslinking saves the energy of heating, but also improves the protective properties of the coating, such as adhesion, corrosion resistance and weatherability.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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