Powder coating UV light crosslinking agent

Powder coating UV light crosslinking agent

UV light crosslinking powder coating used in wood coating, such as medium density fiberboard (MDF), aluminum and magnesium alloy coating, plastic coating, auto evaporator, heavy workpieces, such as pieces of pre-loaded and coil coating, etc.

UV powder coating of economical performance in do not use solvent, no VOC emissions, accord with environmental protection, coating cross-linking temperature is low, is advantageous to the heat sensitive substrate, coating crosslinked speed, equipment is small in size, save a space.

Electron beam crosslinking (EBC) instead of UV crosslinking (UV) also can be used as a metal, wood, medium density fiberboard (MDF) and other heat sensitive substrate using the radiation crosslinking of powder coatings.

The energy of the electron beam varies from 125 keV to 2.5 MeV, while UV radiation only has 3.3 eV when X = 360 nm. When using the unsaturated polyester resin and other unsaturated polymeric material, electron impact causes the formation of free radicals, even without the help of light initiator can also cause polymerization reaction immediately.

The effect of soaking time on the absorption rate of the film. Raise the temperature can significantly increase the crosslinking reaction rate and reduce the bibulous rate of film, the reason is that under the high temperature, emulsion of ammonia volatilization quickly, creating ketone hydrazine crosslinking weakly acidic environment; At the same time, the high temperature accelerated the crosslinking reaction rate and increase system utilization rate of the junction, junction got behind each other hand in 3 d mesh structure, make the film become more dense.

180 ~ 120 ℃ range the crosslinking degree and bibulous rate changed little, and under 120 ℃ curing began to appear at the turning point, a strikingly low crosslinking degree, bibulous rate is obviously on the high side. Therefore, in the process of printing film cured at 120 ℃ can guarantee enough crosslinking, it compared the general printing products need to be cured at 160 ℃ above, ketone hydrazine crosslinking adhesive can relatively low temperature curing, achieve the goal of energy conservation and emissions reduction.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


Using FT - IR, the ATR infrared spectrogram, laser particle size analyzer to characterize the composition and the structure of copolymer emulsion, infrared spectra analysis showed that the ketone carbonyl and hydrazide ketone hydrazine crosslinking reaction, functional groups of various monomer absorption peak reproduction are characterized in the figure; When DAAM is used under 3%, the emulsion is blue, smooth and fine, and the size of the particle size is narrower.

DAAM dosage and adding methods and the stability and emulsion performance of the polymerization process are important. The experimental results show that DAAM monomer can be added in the later stage of polymerization, which can increase the distribution density on the surface of the emulsion and provide better crosslinking effect. When DAAM USES 1.5 percent, the emulsion is better.

The introduction of ketohydrazid crosslinking into the polymerization system can improve the application performance of the printing adhesive by effectively improving the emulsion tolerance and mechanical properties. The experiment found that, on the basis of the amount of DAAM, which is 1.5%, m (ADH) : m (DAAM) = 0.8 ~ 1 was the best emulsion. Ketoid crosslinking is a better way to achieve the low temperature solidification of pigment printing, and energy saving and emission reduction.

The dispersant, da-02, influences the mixing of emulsion and cement. In the process of polymer cement waterproof coating production, cement powder dispersion is a very important production link, its direct relation to the leakage of waterproof coating, construction, appearance and performance of the coating. The cement particles and water can not be fully wetted and reunite, resulting in increased viscosity. In order to spread the cement powder well in the emulsion, it is necessary to add the right amount of dispersants in the process of storage.

The effect of da-02 on emulsion and cement mixing. The experiment showed that the viscosity of the mixture was significantly reduced after the addition of the dispersant, da-02, and the liquid was good and easy to construct. This is because the DA - 02 after join the mixed slurry dispersant, by fully mixing grinding, adsorption on the surface of the paint that crushed into fine particles, to form solid particle surface bilayer structure and outer dispersant polar end strong affinity with water and increased the degree of wetting by water, solid particles due to electrostatic repulsion between solid particles and the space steric effect and away from, to prevent the spread of solid particle formation of harmful flocculation again, can keep the dispersion system in a stable state of suspension.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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