The UV powder coating crosslinking agent

The UV powder coating crosslinking agent,Bisphenol A epoxy resin and solid state polymerization of vinyl ether resin light can be achieved by cationic polymerization, but at present most of the time, the UV powder coating light crosslinking or by free radical polymerization, such as methyl acrylic polyester system, unsaturated polyester, polyurethane acrylate system.

UV crosslinking on the powder coating process is the biggest characteristic is divided into two distinct phases, flat stage will not occur in the molten coating resin crosslinking, early for peace in addition to the bubble fully coating provides plenty of time.

The UV crosslinking can obviously reduce the temperature of heating and crosslinking process (120 ~ 140 ℃), avoid excessive heating of base material, powder coating is more broad application fields, such as wood, plastic, paper, thermal alloy and containing temperature sensitive parts of metal components, etc.

But UV light crosslinking varieties of powder coatings is limited, because: some organic pigments in paint is not resistant to UV light of direct illuminate, or opaque pigments absorption characteristics of UV light, make the bad coating crosslinked.

Deep not crosslinked coating, such as by coating the shape of the structure is complex, part cannot be UV light direct illuminate that the uneven.

Thermal crosslinking unsaturated resin powder coatings generally made from unsaturated resin, thermal initiator, flow ping agent, fillers and pigments and other components. Crosslinking mechanism of the unsaturated resin is thermal initiator decomposition when heated molten state to produce free radicals, in the process of free radicals and growing chain radical end up an atom from other molecules become stable macromolecular, and made out of atoms and become a new free radical, to trigger a new chain unsaturated double bonds continue to increase, to continue the polymerization reaction, since the crosslinking resin under the effect of free radicals of crosslinking reaction.

Resin in the active double bond density, thermal initiator decomposition temperature and the dosage of powder coating preparation and performance of all have important influence, is the basis of the powder formula design and the key.




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


Spray drying powder coating is to pass through the atomized powder coating slurry, make contact with the hot air moisture evaporation, quickly get uniform atomization droplets size distribution and uniform powder coating.

VAMP of supercritical fluid method (Vedoc Advanced Manufacturing Process) is the principle of the mixing various ingredients added to the powder coating blade high pressure reaction kettle, filled carbon dioxide in the kettle to the critical state, supercritical carbon dioxide make coating various ingredients fluidization and mixing evenly, and then through the nozzle spray into required size of the product, the technology advantage is without melting extrusion mixing step, prevent gel, enlarge the application range, can be used in the past, hard to use raw materials.

Dosage of additives in the powder coating formulation is very small, but its role is not to be ignored, commonly used additives have flow ping agent, degassing agent, matting agent, wax powder, edge covering modifier etc.

These additives are usually reserved to be stable in the powder coating to play its proper function, so the use of additives with epoxy, polyester, acrylic resin has good compatibility, etc.

In the preparation of the crosslinking powder coating of low temperature flow ping agent's main function is to reduce the molten surface tension of the powder coating, to flow immediately prior to coating in cross stitch, avoid the orange peel and causing surface defects such as shrinkage cavity, thus to make a small amount of flow ping agent give full play to the role, formula of uniform flow ping agent must be fully dispersed, advance dispersed into the carrier resin flow ping agent distribution effect is better, more conducive to the play a role in the process of low temperature melting crosslinking.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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