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The advantages and disadvantages of fast curing polyester for powder coating

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Do you have heard of fast-curing powder coatings? If you haven't heard of it, Xiao Bian has popularized it for you. In fact, the traditional concept is that adding a curing accelerator in the formulation of powder coatings can quickly achieve the goal of rapid curing; however, excessive dependence on auxiliaries will often bring about other adverse rickets. , For example: worsening of leveling, fading of yellowing of baking, poor heat storage performance of powder, etc. So what's the use of fast curing polyester in powder coatings? Or is there any defect? Lets come look.

1. Fast-curing polyesters The following aspects are often helpful in the use of powder coatings. such as:

(1) Improve the cross-link density, thereby improving the mechanical properties such as film hardness, cross-cut adhesion and impact resistance;

(2) reduce the curing temperature or shorten the curing time, to achieve low-temperature curing or rapid curing;

(3) Preventing the melt flow and leveling of the powder, realizing the appearance control of the texture size and stereoscopic effect;

(4) Interspersed with slow or medium speed curing systems interfering with each other to achieve a reduction in apparent gloss while leveling.

However, at the same time as the fast-curing polyester obtained the above advantages, other disadvantages have gradually emerged. such as:

(1) poor thermal storage stability, the resulting powder coatings tend to clump;

(2) The leveling performance of the coating film is poor, and orange peels and the like easily occur. For this reason, a successful fast-curing polyester product must balance the two contradictory indicators of mechanical properties and leveling performance, thermal storage stability and curing conditions. In order to apply different types of powder coatings, the fast curing polyesters are different in the research and development and production engineering for the above indicators; therefore, the classification is different, and the use characteristics are also different.

2 Application of Fast Curing Polyester in Thermal Transfer Powder Coatings

Thermal transfer powder coatings have always been difficult problems are tearing paper. If the tearing effect is good, there will be no impressions or marks, and the transfer production efficiency will be high. If the tearing or sticking is not good, the marks will be obvious and the production efficiency will be low. After many experiments, the results show that the factors that affect the transfer of paper film tearing are:

(1) The higher the hardness and hardness of the coating, the better the tearing of the paper;

(2) The degree of complete curing of the polyester, the faster and more complete the curing speed, the better tearing of the tearing paper;

(3) The distribution of molecular weight of polyester, the larger the molecular weight, and the narrower the distribution, the better the tearing of paper.

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