What are the functions of crosslinking agents?
English name: Cross linking agent. It is a substance that can act as a bridge between linear molecules, allowing multiple linear molecules to bond and crosslink into a network structure. A substance that promotes or regulates the formation of covalent or ionic bonds between polymer molecular chains.
What are the functions of crosslinking agents?
Crosslinking agents are mainly used in polymer materials (rubber and thermosetting resins). Because the molecular structure of polymer materials is like long lines, without cross-linking, their strength is low, they are easy to break, and they have no elasticity. The role of cross-linking agents is to create chemical bonds between linear molecules, connecting them together to form a network structure, thus improving the strength and elasticity of rubber. The cross-linking agent used in rubber is mainly sulfur, and accelerators need to be added.
1. Crosslinking and modification of various thermoplastic materials such as polyethylene, polyvinyl chloride, chlorinated polyethylene, EVA, polystyrene, etc. The general addition amount for thermal crosslinking is 1-3%, and the addition of diisopropylbenzene peroxide (DCP) is 0.2-1%; The dosage of irradiation crosslinking is 0.5-2%, and DCP can be omitted. Cross linking can significantly improve the heat resistance, flame retardancy, solvent resistance, mechanical strength, and electrical properties of the product. It significantly improves product quality and has no odor compared to crosslinking with a peroxide system alone. Typical applications include polyethylene, polyethylene/chlorinated polyethylene, polyethylene/EVA cross-linked cables, and polyethylene high and low foaming products.
2. The vulcanization assistance of special rubbers such as ethylene propylene rubber, various fluororubbers, CPE, etc. (used in combination with DCP, generally at a dosage of 0.5-4%) can significantly shorten the vulcanization time, improve strength, wear resistance, solvent resistance, and corrosion resistance.
3. Crosslinking of acrylic and styrene type ion exchange resins. It has lower dosage, higher quality, and can be used to prepare ion exchange resin with excellent properties such as anti fouling, high strength, large pore size, heat resistance, acid and alkali resistance, and oxidation resistance compared to divinylbenzene crosslinking agent. This is a newly developed and highly promising new type of ion exchange resin both domestically and internationally.
4. Modification of polyacrylic esters, polyacrylic esters, etc. It can significantly improve heat resistance, optical performance, and processing performance. Typical for heat-resistant modification of ordinary organic glass.
5. Modification of epoxy resin and DAP (diallyl phthalate) resin. Can improve heat resistance, adhesion, mechanical strength, and dimensional stability. Typically used for modifying epoxy potting and encapsulating materials.
6. Crosslinking and modification of unsaturated polyester and thermoplastic polyester. It can significantly improve heat resistance, chemical corrosion resistance, dimensional stability, weather resistance, and mechanical properties. Typically used to improve the heat resistance of hot pressed unsaturated polyester fiberglass products, the modified products can be used at temperatures above 180 ℃.
7. TAIC's own homopolymer—— Polyallyl isothiocyanate is a transparent, hard, heat-resistant, and electrically insulating resin that can also be used to bond glass and ceramics. Typically used for manufacturing multi-layer safety glass.
8. The internal plasticization of polystyrene and copolymerization modification of styrene with TAIC can produce transparent and crush resistant products.
9. A protective agent for metal heat resistance, radiation resistance, and weather resistance, TAIC prepolymer is baked and plated on metal surfaces, and its baked coating has excellent heat resistance, radiation resistance, weather resistance, and electrical insulation properties. Typical insulation materials used for manufacturing microelectronic products, such as printed circuit boards.
10. Used as an intermediate for UV curable coatings, photoresists, flame retardants, and flame retardant crosslinking agents. Typically used for synthesizing high-efficiency flame retardant TBC and flame retardant crosslinking agent DABC.
