Polyester resin

Polyester resin is the general term for high-molecular compounds formed by the condensation polymerization of diols or dibasic acids or polyols and polybasic acids. Polyester resins are divided into saturated polyester resins and unsaturated polyester resins. Unsaturated polyester adhesives are mainly composed of unsaturated polyester resins, pigments and fillers, initiators and other additives. The adhesive has low viscosity, is easy to wet, has good processability, and the cured adhesive layer has high hardness, good transparency, high brightness, can be quickly cured at room temperature under pressure, has good heat resistance, and excellent electrical properties. The disadvantages are large shrinkage rate, low adhesive toughness, poor resistance to chemical media and water, and it is used as a non-structural adhesive. It is mainly used for bonding fiberglass reinforced plastic, hard plastic, concrete, electrical tank sealing, etc.