*Abrasion and scratch resistant
*Increases or inhibits slippage
*Matte or improve gloss
*Improve hand feel
*Improves adhesion of plastic films
When the internal pressure in the small bubbles is enough to blow up the energy of the coating film, the small bubbles will burst and the air inside will go to the atmosphere. If the coating film has lost its leveling properties at this time, the small bubbles that escaped from the air cannot be bridged. Stomata will form typical particles or particles with volcanic craters, which becomes a serious problem of the coating film.
If the defoamer is added to the powder coating, the defoamer can reduce the melt viscosity of the powder coating, and at the same time reduce the surface tension of the coating, so that the blisters and pinholes on the surface of the coated object will be affected by the baking temperature and the pressure will increase. It is easy to blow up the leveling uncured coating film and run into the atmosphere. At the same time, the de-bubble coating film gap can be easily bridged and leveled, so that the coating film avoids particles and particles, or produces particles with volcanic craters or Particles,
Because the defoaming mechanism of water-based coatings and solvent-based coatings is completely different from that of powder coatings, the defoaming agents used in wax for water-based coatings and solvent-based coatings cannot be directly used in powder coatings. Due to the particularity of powder coatings, there are not as many defoamers used in powder coatings as in water-based coatings and solvent-based coatings. At present, the commonly used defoamers in powder coatings are: Hubei Laisi New Chemical Materials Co., Ltd. The foaming agent YPE. is a white fluid powder with a melting point of 134~140℃ and a volatile content of less than 0.3%. The addition amount is 0.5%~0.8% of the total formula, and it is dispersed by melt extrusion mixing method. The ordinary defoamer ZS-601 of Hangzhou Zhongshun Chemical Industry and Trade Co., Ltd. is a white powder, and the dosage is about 1% to 2% of the total formula: the high-efficiency defoamer ZS603 is a white powder, suitable for cast iron, cast aluminum and thermal For coatings such as galvanized parts, the dosage is 2%~2.5% of the total formula, all dispersed by melt extrusion mixing method. The defoamer HW-601 of Hangzhou Hongwei Chemical Industry and Trade Co., Ltd. is a white powder, and the dosage is the formula About 2% of the total amount is dispersed by melt-extrusion mixing method, and many auxiliary companies sell defoamers for powder coatings.
Matting agent and matting curing agent
In the powder coating formulation, the matting agent is through physical action, and the matting curing agent is the auxiliary agent for matting the powder coating film through chemical and physical action. The matting effect of the matting agent is mainly caused by the poor compatibility between the matting agent and the film-forming material. It is mainly a physical effect. The physical method of matting is also the use of fillers, such as matting barium sulfate, kaolin, Wollastonite powder and mica powder can also achieve a certain degree of matte coating. In addition, a method of matting with matting resin or the like is also effective. The extinction range of this physical extinction method is relatively narrow, especially the extinction method with matting fillers can only be applied to the range where the gloss is as low as 60% (60*).
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