Methanol Guide: morning analysis of methanol market on November 20

Powder coating itself is only a semi-finished product, and only after spraying and curing can it really become the final product. Consumers only pay attention to the effect and quality of coating, that is to say, the use of powder coating is as important as the production of powder coating, the powder with low quality, the spraying equipment is better, the pretreatment is more meticulous, and the coating process is better No matter how strict it is, it will not produce high-quality products; no matter how good the powder quality is, there will be no problems in the spraying equipment, process and pre-treatment, and there will be no high-quality products. However, the reality is that most of the domestic coating enterprises focus on the powder coating products themselves. If there are quality problems, they only look for problems in the powder, but not enough attention and Research on the coating construction process, resulting in a large number of problems Coating products can not achieve the desired effect. Each kind of powder coating has its own curing characteristic curve, which can achieve complete curing in a certain temperature and time range.

In order to improve efficiency and reduce cost, it is not advisable to shorten the curing time. If the curing temperature or time is not enough, it will lead to incomplete curing, the due performance can not be exerted, and its physics The characteristics will be greatly reduced, the chemical resistance will not be good, and the decoration, corrosion resistance and weather resistance will not achieve the expected results. Some coatings cured at low temperature are not as good as those cured at high temperature. In particular, some workpieces formed after curing will form small cracks at the stamping and bending places, and water will penetrate along the cracks, and quickly corrode the base material. We can see that the traffic barrier used outdoors will come out at the arc corner of the intersection soon after it is put into use The trace of rust is directly related to baking temperature and time and bending after spraying. Coatingol.com. Some people think that the heating temperature is lower, the reaction speed is lower, and the leveling can be better.

In fact, on the contrary, because after powder spraying, its melting and curing are almost carried out at the same time, the heating is rapid, the temperature rises fast, the viscosity of the system is rapidly reduced, and the leveling process has been completed before gelation, so the board surface has good leveling property and less orange peel. At the same time, the coating can wet the surface very well, improve its adhesion and durability. Due to the rapid curing, the internal stress of the film will be more, but due to the thin film, the effect of physical properties is very small. On the contrary, if the heating is slow, the viscosity of the system always keeps a high level, at this time, the curing has started, and with the reaction, the viscosity is increasing, so the leveling effect will not be good. In a word, if you want to heat quickly to reach the curing temperature in a short time, you can get the ideal coating effect and long-term protection function. If the heating temperature is low and the time is too long, the curing effect will occur before the powder coating melts, leveling and moistens the coating, and the physical properties are not ideal. At the same time, volatiles are hard to escape, which leads to the coating damage in advance under corrosive conditions, and the decorative and protective properties are not reflected