Thermoplastic Vulcanizate (English for Thermoplastic Vulcanizate), referred to as TPV, thermoplastic rubber vulcanized rubber referred to as thermoplastic rubber (English Thermoplastic Rubber), referred to as TPR, but this name is easily confused with other types of thermoplastic elastomer (English Thermoplastic Elastomer) Together, because thermoplastic elastomers are often called thermoplastic rubbers, especially styrenic elastomers, it seems that at least in China, "TPR" has become its proprietary name. When it comes to TPR, it means SBS, SEBS. Thermoplastic elastomers, such as styrene elastomers, are inseparable from the consumption of styrenic elastomers in the consumer and consumer end products sectors.
The name of the thermoplastic vulcanized rubber, if it is more detailed, it should be thermoplastic dynamic vulcanized rubber (English Thermoplastic Dyamic Vulcanizate), adding the word "dynamic" is more specific to the process of producing this thermoplastic vulcanized rubber - dynamic vulcanization, which The process refers to vulcanizing the rubber during the melt blending of the rubber and the thermoplastic, and of course the rubber is continuously vulcanized while being mixed with the thermoplastic, so that the vulcanized rubber is distributed as a dispersed phase in the continuous phase of the thermoplastic. The corresponding thermoplastic static vulcanized rubber means that the rubber is first vulcanized according to the conventional method, and then the vulcanized rubber is ground into a powder by a milling device, and finally blended with the molten thermoplastic. In theory, this method can also be made. A good performance TPV, but so far, is only in the laboratory stage.
TPV is mainly composed of two parts, one is plastic, as the continuous phase, and the other is rubber as the dispersed phase. Usually the rubber needs to be combined with a softening oil or plasticizer. Vulcanizing agents and some auxiliary auxiliaries are also essential. In addition, in order to reduce costs or improve performance in some aspects, some inorganic fillers will be added.
Many TPVs can be formed between plastics and rubber, but only individual blends have practical value after dynamic vulcanization. Currently commercialized are PP/PE/EPDM, PP/NBR, PP/ACM, PS/SEBS. In the book "Thermoplastic Elastomers" of the Chemical Press, 99 rubber/plastic blends prepared from 11 rubbers and 9 plastics were reviewed. It was found that the best properties of rubber/thermoplastics were dynamically vulcanized. For the mixture, the following conditions must be met:
(1) surface energy matching of two polymers of plastic and rubber;
(2) The rubber entanglement molecular chain length is low;
(3) The crystallinity of the plastic is greater than 15%. When (PA66) plastic and rubber have a relatively large difference in polarity or surface energy, a suitable compatibilizer can be added and then dynamically vulcanized to obtain a blend with excellent properties.
1, good elasticity and compression deformation resistance, environmental resistance, aging resistance is equivalent to EPDM rubber, and its oil and solvent resistance is comparable to general-purpose neoprene.
2, the application temperature range is wide (– 60-150 ° C), soft hardness application range (25A-54D), the advantages of easy dyeing greatly improve the freedom of product design.
3, excellent processing performance: can be processed by injection molding, extrusion and other thermoplastic processing methods, efficient, simple and easy, no need to add equipment, high fluidity, small shrinkage.
4, green, environmentally friendly, recyclable, and repeated use of six times without significant decline in performance, in line with EU environmental requirements.
5, light weight (0.90-0.97), uniform appearance quality, high surface quality, feel good.
Based on the above performance characteristics, TPV has a certain substitution in terms of comprehensive performance and comprehensive cost compared with traditional rubber materials, other TPE elastomers (including TPRSBS, SEBS, TPU, etc.) or PVC and other plastic materials in a wide range of applications. Advantages, thus providing new options for product companies in product innovation, product value-added, and competitiveness.
TPV is the abbreviation of Thermoplastic Vulcanizate. The Chinese name is thermoplastic EPDM dynamic vulcanized elastomer or thermoplastic EPDM dynamic vulcanized rubber. It is a high-vulcanized ethylene propylene diene monomer EPDM microparticle dispersed in continuous polypropylene PP phase. Molecular elastomer material. The physical properties and functions of TPV at room temperature are similar to those of thermosetting rubber, which is characterized by thermoplastics at high temperatures and can be processed quickly, economically and conveniently. TPV thermoplastic EPDM dynamic vulcanized elastomer/rubber The vulcanized rubber material is dynamically vulcanized to disperse ethylene propylene diene monomer EPDM in a polypropylene PP plastic matrix with particles below 2 microns in size, giving the rubber and plastic properties very good. The combination of high performance elastomer materials with excellent overall performance.
Main properties of TPV thermoplastic EPDM dynamically vulcanized elastomer/rubber:
1. TPV can be used in the temperature range of -60 ° C ~ 135 ° C, and the application temperature range is wide;
2, TPV hardness range between 25A ~ 65D, can meet a wide range of hardness requirements;
3, TPV has good weather resistance, excellent anti-aging, ozone and UV resistance;
4, TPV does not need to be vulcanized, can be directly processed by injection, extrusion, calendering, blow molding, etc., which can shorten the processing process and reduce the processing cost;
5, TPV environmental performance similar to EPDM (EPDM), oil and solvent resistance similar to neoprene;
6, TPV is easy to weld, reusable, environmentally friendly and non-toxic.
Main features of TPV thermoplastic EPDM dynamically vulcanized elastomer/rubber:
1. Excellent anti-aging performance and good weathering and heat resistance;
2, excellent resistance to permanent deformation;
3. Excellent tensile strength, high toughness and high resilience;
4, excellent environmental performance and reusable;
5, excellent electrical insulation properties;
6, a wide range of hardness;
7, a wide range of operating temperatures;
8, the color is diversified, there are all transparent, translucent, light-colored series, easy to color, easy to form;
9, can be co-injection or extrusion molding with PP, PA, PC, ABS, PS, PBT, PET and other materials.