Advantages and main classifications of thermoplastic rubber

Thermoplastic rubberAbbreviationTR，Yes一A material between rubber and plastic,It is a kind of rubber that has rubber properties at room temperaturespanSex,Material that can be plasticized and molded at high temperatures,This material has 一Some (or all) areoneA component that can show rubber elasticity. There are internal molecules that can form intermolecular cross-links at room temperature. Constraint components,At high temperatures, the aggregation of these constrained components will melt or melt and become plastic.

The advantages of this material are as follows:

①It can be quickly formed using the molding machine used for thermoplastic resin, andNo need to vulcanize;

②Changing the chemistry of raw materialsKnotstructure, various elastomers with properties similar to soft vulcanized rubber to plastics can be produced;;

③ ​​prepared BombThe body is thermoplastic because it is not cross-linked, and the waste can be recycled. This product can be divided into the following categories according to the type of polymer.

（1) Polystyrene MainlySBS(styrene–dingethylene–vinegarAcid vinyl copolymer, ethylene-acrylate structure polymer, polyethylene Ethylene-butyl rubber graft copolymer, etc..These polymers can be used directly,But it is usually used after cross-linking with organic peroxide. Polyethylene-butyl rubber graft copolymer isHighDensity polyethylene, low density polyethylene and unsaturation are1.4% butyl rubber joint technology, with appropriate elasticity, due to its excellent electrical properties, it is usually used as electrical insulation material.

Thermoplastic rubber is the successor to natural rubber and synthetic rubber The third generation of rubber that emerged later has obvious advantages in saving energy and manpower, so it has developed rapidly in recent years and is also being developed domestically. But from a technical perspective, there are still shortcomings. First of all, there is a problem of poor heat deformation resistance. The oil resistance and solvent resistance of polystyrenes need to be improvedyuIncrease, the thermal decomposition resistance, chemical resistance, and hydrolysis resistance of polyurethanes need to be improved, and polyolefinHydrocarbonGeneral characteristics of the class Poor.

Polyester has more comprehensive properties，But due to incomplete separation between the constrained phase and the rubber phase, The result is high stress at low elongation.