1. Concept: Solvent type baking paint purposed acrylic resin and hydroxy acrylic resin are collectively referred to as thermosetting acrylic resin, with "-OH", except that the film forming material is the same as melamine formaldehyde (commonly known as amino) resin or epoxy Resins, etc., crosslink under high-temperature barbecue conditions; because Amino resin is a ring structure, there are many cross-linking points, the formation of a dense network structure, high fastness, coating hardness and chemical resistance is better.

2. Application: Acrylic resin for baking paint Because it needs to be cross-linked at high temperature (generally 110°C-180°C), two or even more kinds of groups, the coating is more resistant to Solvent and abrasion than hydroxy acrylic resin. Anti-bending, weather resistance, adhesion and other properties are also outstanding. Therefore, these resins are used in many applications such as automobiles, motorcycles, coils, and other plating materials.

3. Selection: Acrylic resin film for baking paint is much more complex than hydroxy acrylic resin. In addition to taking into account the reaction of "-OH" and amino group, the reaction of carboxyl group and amino group is also considered, as well as other acrylic resin system for baking paint. Functional groups such as epoxy groups. Therefore, only lower TG and molecular weight are needed for the acrylic resin for baking paint, and the desired coating performance can be obtained. Resin application engineers should consult with the manufacturer when selecting the paint resin (general formula designers are not very clear about the modified groups in the resin).

Attached: Carboxyl group: Regardless of the thermoplastic or thermosetting acrylic resin, a certain amount of carboxyl monomers is added to the formulation in a more or lesser degree. The amount of carboxyl monomer added is reflected in the Acid value of the resin. In addition to considering the use of silver (or copper) paint, the high Acid value of the resin system will significantly improve both the wetting and dispersing of the pigment and the adhesion to the substrate. At the same time, carboxyl groups play a catalytic and promotional role in the cross-linking reaction rate and cross-linking density of "-OH" and Amino resin or polyisocyanate resin; however, the amount of carboxyl groups cannot be infinitely increased because of the carboxyl group's polarity. Larger than a certain amount, the dilution of the resin will be poor, Viscosity will be relatively large, and if it is a thermosetting system, the storage stability of the coating will not be guaranteed.