The difference between the polyester resin and the alkyd resin is that the raw material of the synthetic polyester resin does not contain fatty acids that are mainly represented by vegetable oils or oils. Polyesters can be divided into saturated polyesters and unsaturated polyesters. Saturated polyester means that the synthetic raw material does not contain unsaturated bonds other than benzene rings. The following Xiaobian introduces the relevant knowledge of polyester resin.
What are the main applications of polyester resins?
Polyester resins are used in three major areas: fibers, sheets and films, and bottle resins.
About 1/2 of the synthetic fibers in the fiber world are made of PET. Suitable for the production of high-strength fibers, papermaking nets, and high-strength films. PET sheet is a sheet used for pharmaceutical packaging after PVC sheet, especially after it is forbidden to use PVC for disposable packaging in some European countries, it becomes the main sheet for pharmaceutical packaging. The PET sheet is dried, extruded and cast into cast PET resin. The PET film is used as a high-grade packaging material for medical instruments, precision instruments, and electrical components, and as a base material for audio tapes, video tapes, motion picture films, computer floppy disks, and photographic films. PET can also be made into a stretch film for the packaging of various products and after aluminum plating or coating PVDC and then combined with other films to form a composite film.
PET is characterized by light weight, high strength, good toughness, transparency, high internal pressure after orientation stretching, good chemical stability, high barrier property, can be made into bottle containers for inflatable drinks and purified water, etc. package. The crystallized PET resin gas and water vapor have low permeability and have excellent gas barrier, water, oil and odor properties. It is non-toxic and odorless, has good hygienic safety and can be used directly in food packaging. It is a better heat-resistant packaging material, suitable for food containers for frozen foods and microwaves, and packaging for hot-filled foods.
The dielectric strength and volume resistivity of the polyester film are the largest in the plastic film and are the most used insulating materials in the plastic film. It is resistant to most solvents, high temperature resistance, is widely used in motors, capacitors, transformers, as a substrate for insulating materials, audio tapes, video tapes.
Polyester resin performance applications:
When synthesizing polyester resin, if some other structures are introduced through chemical modification, the polyester resin can have properties that are not originally possessed, so as to improve and highlight a certain performance purpose, so as to achieve special application performance requirements. Epoxy, acrylic, silicone-modified polyester resins.
The polyester resin used in the coating is generally a low molecular weight, amorphous, branched, crosslinkable polymer. It is generally made of polyhydric alcohols and polybasic esters, and has two structures of pure linearity and branched type. The film made of pure linear structure resin has better flexibility and processing performance; and it is prepared from branched structural resins. The hardness and weather resistance of the paint film are more prominent. Hydroxyl-terminated polyesters can be obtained by adjusting the polyester resin formulation such as polyol excess. If the acid is excess, then a carboxyl terminated polyester is obtained.
Editing summary: The above is Xiaobian's introduction to polyester resin related knowledge, more practical knowledge, please pay attention to Qijia information.
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