Types and properties of Yutai Chemical-polyester coatings
Release time:
2022-11-30 15:52:05.854
It contains unsaturated bonds in the main chain of polyester, while alkyd resin contains unsaturated bonds in the side chain; It is cured by free radical polymerization with solvent containing unsaturated bond, while alkyd resin is polymerized by the action of oxygen in the air; However, oxygen can inhibit the polymerization of unsaturated polyester.
Type of polyester resin Polyester resin is the abbreviation of unsaturated polyester adhesive. Unsaturated polyester adhesive mainly consists of unsaturated polyester resin, initiator, accelerator, filler, thixotropic agent, etc. A linear structure (see linear polymer) polyester resin containing - CH=CH - double bond in the main chain can be mixed with olefinic monomers, such as styrene, acrylate, vinyl acetate, etc., and polymerized into insoluble and insoluble products at room temperature under the action of initiator and accelerator. The English abbreviation of unsaturated polyester is UP. It is mainly used to produce coil coating. Polyester resin is divided into saturated polyester resin and unsaturated polyester resin. The unsaturated polyester adhesive is mainly composed of unsaturated polyester resin, pigments and fillers, initiators and other additives. The adhesive has low viscosity, easy wetting, good processability, high hardness, good transparency, high brightness, rapid curing under pressure at room temperature, good heat resistance and excellent electrical properties. The disadvantages are large shrinkage rate, low adhesive toughness, poor chemical medium resistance and water resistance, which are used for non-structural adhesives. It is mainly used for gluing glass fiber reinforced plastic, hard plastic, concrete, electrical tank seal, etc. Saturated polyester resin (oil-free alkyd resin) is mainly used for the production of coil coatings. According to the different properties and structures of the resin, it can be used for the top coat, primer and back coat of the coil coatings, as well as the saturated polyester resin used for printing ink and thermal coated coil.
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