Polyurethane coating with crosslinking agent

Polyurethane coating with crosslinking agent,In the manufacture of polyurethane powder coating, to avoid the crosslinking reaction at room temperature and coating provides excellent storage stability, must be used by the crosslinking agent of isocyanate to protect it.

Although there are quite a lot of isocyanate and a variety of sealants can exist in many different combinations, but only in caprolactam closed isophorone diisocyanate derivative truly of commercial value.

Caprolactam closed IPDI derivatives. Caprolactam closed different fluorine ketone diisocyanate derivative is polyurethane crosslinking agent of powder coating is the most widely used. They should have appropriate melting range, that they used for powder coating cross-linking agent, can use standard extrusion process of powder.

When the system is appropriate catalyst, can unlock temperature and crosslinking rate adjustment to adapt to the ordinary conditions of crosslinking ? in 160-160 of the most commonly used react ? caprolactam closed isophorone diisocyanate (IPDI, such as B1530). Caprolactam closed IPDI prepolymer, different catalysts used to accelerate the reaction between isocyanate and alcohols.

Chlorinated polyether powder coating. Chlorinated polyether has excellent chemical stability, coating of many kinds of acid, alkali and solvents have good corrosion resistance, dissolving resistance, chemical stability after ptfe, mechanical and friction performance is very good also. Chlorinated polyether powder coating is mainly used in chemical equipment, pipe lining, instrumentation equipment shell, etc. The downside is poor and metal adhesion. By adding additives can be improved and the adhesion of the metal.

Latex emulsion powder is by spray drying manufacture, most is a kind of vinyl acetate copolymer. Use latex powder to produce coating latex powder coating. Stir in water construction, is currently the most green metope paint 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


Powder coating construction technology and requirements: the so-called powder electrostatic spraying is the principle of using high voltage electrostatic corona electric field. On the diversion standard spray gun head metal connected to high voltage anode, by spraying the workpiece grounding form the positive, between the gun and workpiece to form a strong static electric field.

When compressed air as carrier gas, the powder coating powder for powder from the barrel of the pipe to the spray gun guide rod, because the guide rod connected to high voltage anode of corona discharge, near its produced negative charge, make the powder with negative charge, and entered into the field intensity high electrostatic field, under the dual role of electrostatic force and the carrier gas, powder evenly to ground surface formation thickness uniformity of powder layer, heat curing into durable coating.

Coating process flow. Deal with a dry remove moisture, spraying inspection before a baking a check a finished product construction general powder coating construction requirements

In order to make the characteristics of the powder coating can give full play to and extend the service life of the coating. When spraying, the coated material is completely grounding, in order to increase the powder coating spray efficiency.

Powder spraying immediately after inspection, if discover the defect should be handled in time, if finding defects after curing, the only local without affecting the smaller range, the coated surface decoration, color powder can be used with the acetone diluted to repair, if large range and influence the surface quality, use sand paper burnish, spraying again or use the paint remover to remove coating, Suo powder again.

After recycling powder should be filtered to remove impurities, according to certain proportion and the new powder mixing action.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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