Unsaturated polyester resin

Unsaturated polyester resin

Unsaturated polyester resin is generally composed of unsaturated dicarboxylic acid diol or saturated unsaturated diacids and diols condensation with ester and unsaturated double bonds of linear polymers. Usually, polyester polycondensation is 190 ~ 220 DEG C, until it reaches the expected value (or viscosity), in polyester shrinkage at the end of the reaction, while still hot by adding a certain amount of vinyl monomer, viscous liquid, such a polymer solution for unsaturated polyester resin [1].

Unsaturated polyester resin is a chemical raw material, commonly used in the surface of the object is thick, curing, the use of brush paint as a general, the layers of the stack, curing process, such as the release of harmful gases.

Unsaturated polyester resin is one of the most commonly used thermosetting resin, which is composed of saturated dicarboxylic acid, unsaturated diacids and diols condensation of linear polymers, formed by crosslinking monomer or active solvent dilution resin solution with a certain viscosity, referred to as up.

Performance features

1 excellent process performance. This is the biggest advantage of unsaturated polyester resin. Can be cured at room temperature, under normal pressure, the process performance is flexible, especially for large and on-site production of glass steel products. After curing, the comprehensive properties of the resin was good, and the mechanical properties of the resin was slightly lower than that of the epoxy resin, but better than that of the phenolic resin. Corrosion resistance, electrical properties and flame retardant properties can be obtained by choosing appropriate grade of resin to meet the requirements, resin color light, can be made into transparent products.

2 varieties. Variety, wide range, low prices. The disadvantage is that the storage period is short.

Physical property

The relative density of unsaturated polyester resin is about 1.11 to 1.20, while the volume shrinkage of unsaturated polyester resin is relatively large, and some physical properties of the cured resin are as follows:

The heat resistance. The thermal deformation temperature of the vast majority of unsaturated polyester resin in the 50 ~ 60, some of the good heat resistance of the resin can reach 120. The red hot expansion coefficient is 1 (130 ~ 150) * 10-6 C.

The mechanical properties of. Unsaturated polyester resin with high tensile, bending, compression strength.

The resistance to chemical corrosion. Unsaturated polyester resin water, dilute acid, dilute alkali performance better, the performance of organic solvent resistance difference, at the same time, resin chemical corrosion resistance varies according to the chemical structure and geometry switch can have very big difference.

The dielectric properties. Dielectric properties of unsaturated poly acid resin.