Matte powder coating powder is a kind of semi-finished product, only after spraying, cure to become a product, customers pay more attention to the effect after coating and the quality, therefore, to use powder coating powder manufacturing powder coating powder, poor quality, spraying equipment again good, pretreatment and fine, coating process and how strictly, it is impossible to produce high quality products; However, the quality of the powder spraying equipment, process, handle all the problems before, resulting in a decline in the quality of the product, but in fact, more attention of domestic paint company in the production of the powder coating powder, once appear quality problem, will find problems from the powder, and insufficient attention to the coating process and research, causing a lot of coating product cannot reach due effect.
Each has its own curing powder coatings powder characteristic curve, within a certain temperature and time can be achieved completely cured, in order to improve the efficiency, reduce cost and in violation of the law, shorten curing time of practice is not desirable, if curing temperature and time is not enough, can cause curing incomplete, should be the performance of the play not to come out, its physical properties significantly decreased, Chemical resistance will not be good, decorative, corrosion resistance, weather resistance are not up to the expected effect.
Some low-temperature curing coating even after fully cured, is not as good as high temperature curing coating performance, especially after curing some workpiece, forming small cracks in stamping, bending, water will penetrate along the crack, and quickly make the substrate corrosion, we can see the outdoor use of traffic fence, After being put into use, rust marks will appear at the arc bend of the intersection soon, which is directly related to the baking temperature and time and bending after spraying.
some people think that the heating temperature is lower, response speed, flow leveling can be better. In fact, the opposite, because after powder coating, the melting and solidification is almost at the same time, rapid heating, the temperature rises quickly, the system viscosity reduces rapidly, has been completed before the gel flow process, the board face good flowing property, and less orange leather.
At the same time, the coating can be very wet to the surface, can improve its adhesion, durability is good.
Due to the rapid curing, the internal stress of the film will be more, but because the film is thin, the physical characteristics have little effect.
On the contrary, if the heating is slow, the viscosity of the system always maintains a high level. at this time the curing has begun, as the reaction proceeds, the viscosity is increasing, the leveling effect will not be good.
Therefore, if you want to heat quickly, in the shortest time to reach the curing temperature, you can obtain the ideal coating and long-term protection, but if the heating temperature is too low, too long, then before the powder coating powder melting, leveling, wetting, curing phenomenon will occur, then its physical properties are not ideal.
In THE MEANTIME, VOLATILE MATERIAL ESCAPES HARD, FALL IN STRONG CORROSION ENVIRONMENT ACCORDINGLY, COATING CAN BE DESTROYED PREMATURELY, CANNOT GIVE FULL PLAY TO ADORNMENT ACTION AND PROTECTIVE ACTION.