Color: transparent light yellow liquid
Composition: polymer interface polymer
To solve the poor adhesion of nylon material when spraying paint
Usage: spraying, rubbing, soaking
Spraying film thickness: 3-5μm
Baking time: about 5-6 minutes
Baking temperature: about 65 degrees
In some powder coating formulations, brighteners can improve the gloss of the coating film, such as sand grain and wrinkle powder coatings. Therefore, some manufacturers use a variety of brighteners to promote it. In most formulations, the brightening effect is not Obviously, after adding this additive, the appearance of the coating film has been significantly improved. In fact, its function is comprehensive, not a single function, unlike the leveling agent, which is particularly prominent. Therefore, it is necessary to decide whether to add brightener and how much it should be based on the type of leveling agent and other additives in the ptfe modified pe wax density powder coating formulation, as well as the requirements for the appearance of the coating film.
The degassing agent is used to make the air, moisture contained in the powder coating and the volatile substances such as small molecular compounds produced during the crosslinking and curing reaction of the powder coating escape when the powder coating is melted and leveled to form a film, and the escape is small. The pinholes of molecular compounds should be closed in time to prevent the film from producing small pinholes or pig pores and other maladies.
The degassing agent commonly used in powder coatings is benzoin, also known as benzophenone (commonly known as benzoin). Anzac is a white or light yellow odorous product, with a melting point of 133~137°C, a boiling point of 344°C, slightly soluble It is soluble in hot acetone and hot ethanol in water and ether. Its disadvantage is that it causes yellowing of the coating film under high temperature conditions. In order to overcome the shortcomings of benzoin, new degassing agents such as silicone modified benzoin and synthetic wax that are not easy to change color under baking and curing conditions have been developed. DSM observes the shrinkage of bubbles through a microscope and studies the effect of benzoin on the degassing of polyester epoxy powder. In the process of melting, leveling and solidification of powder coatings with benzoin, the bubbles shrink very quickly, the viscosity of the coating has not changed, and almost all bubbles disappear.
When benzoin is not added, the bubbles shrink very slowly. The degassing effect of benzoin on different gases: when benzoin is not added, the contraction speeds of nitrogen, oxygen and air bubbles are almost the same; while when benzoin is added, the contraction speed of oxygen bubbles is significantly faster than that of air bubbles, and the contraction speed of nitrogen bubbles is slower. Without benzoin, the air bubble shrinkage rate is similar. Benzoin begins to vaporize at 100°C in an inert gas environment. At 200°C, more than 90% of the coating film volatilizes. The same trend occurs in the air, but the product is not benzoin, but benzoyl, the oxide of benzoin. Benzoyl is a yellow-colored substance, and the yellowing of the coating film is related to this phenomenon. In addition, some believe that the purity of benzoin is not high, and the high impurity content is another important reason for the yellowing of the coating film.
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