1.Styrene TPE

　　Styrene TPE, also known as TPS, for butadiene or isoprene and styrene block type copolymer, its performance is closest to SBR rubber. At present, the world production of TPS has reached more than 700,000 t, accounting for about half of all TPE. The representative type is styrene - butadiene - styrene block copolymer (SBS), widely used in the shoe industry, has largely replaced rubber; At the same time in the adhesive cloth, rubber board and other industrial rubber products in the use is also expanding. SBS is also used as a large number of PS plastic impact modifier, but also asphalt pavement pavement wear, crack, anti-soft and anti-skid excellent modifier. The SBS modified PS plastics can not only greatly improve the impact resistance like rubber, but also have a very good transparency. Compared with SBR rubber and WRP powder, SBS modified asphalt pavement is more easily dissolved in asphalt. As a result, although more expensive, it is still widely used. Nowadays, more with waterproof coil material further popularize building housetop, subway, tunnel, groove waterproof, moistureproof above. SBS and s-sbr, NP rubber and made of sponge, than the original PVC, EVA plastic sponge more full of rubber touch, and than vulcanized rubber to light, bright color, pattern clear. Accordingly, suit to make the sponge of rubber shoe medium sole not only, also be the ideal material that travel shoe, athletic shoe, fashionable dress shoe is one-time outsole.

　　In recent years, isoprene substituted butadiene block styrene polymer (SIS) developed rapidly, its output has accounted for about 1/3 of TPS, about 90% used in adhesives. The hot melt adhesive made by SIS is not only superior in viscosity, but also good in heat resistance. SBS and SIS the biggest problem is not heat, the use temperature generally can not exceed 80℃. At the same time, its strong elongation, weather resistance, oil resistance, wear resistance and so on can not be compared with rubber. For this reason, in recent years, the United States and Europe and other countries have made a series of performance improvements on it. SEBS and SEPS with saturated hydrogenation of SBS and SIS have appeared successively. SEBS(with BR hydrogenation as soft chain segment) and SEPS(with IR hydrogenation as soft chain segment) can greatly improve the impact strength, weather resistance and heat aging resistance. In 1984, mitsubishi chemical made a better performance mixture based on SEBS and SEPS, and named the saturated TPS as "Rubberron". Therefore, SEBS and SEPS are not only universal, but also blending materials used in engineering plastics to improve the weather resistance, wear resistance and heat aging resistance. Therefore, SEBS and SEPS are quickly developed into compatibilizers of nylon (PA), polycarbonate (PC) and other engineering plastics "alloys". In addition, many new varieties such as high transparency TPS for epoxy resin and non-toxic TPS for health care have been developed.

　　SBS or SEBS and PP plastic melt blend, can also form IPN type TPS. The so-called IPN is actually two kinds of polymer with networks running through each other, so it is also called interpenetrating network compound. Although most of them belong to thermosetting resins, there are also many TPE thermoplastic elastomers in the form of a cross continuous phase. IPN - TPS formed with SBS or SES as substrate and other engineering plastics can be directly coated without pretreatment. The coating is not easy to scratch, and has a certain oil resistance, elasticity coefficient in the low temperature wide temperature range without any change; The cold resistance and heat resistance of engineering plastics are greatly improved. Styrene compounds and rubber grafting copolymerization can also become TPE with thermoplastic, EPDM/ styrene, BR/ styrene, ci-iir/styrene, NP/ styrene and so on have been developed.

　　2.Olefin TPE

　　Olefin TPE is a blend with PP as the hard chain segment and EPDM as the soft chain segment, TPO for short. Due to its lighter specific gravity than other TPE (only o.88), its heat resistance as high as 100℃, weather resistance and ozone resistance, it has become another rapidly developing TPE variety. Since it was first listed in the United States in 1972 under the trade name of TPR by UniroyaI, it has enjoyed double-digit growth for many years, with production reaching 30,000 t in 2000 and an estimated 400,000 t in 2002. Now, TPO has become the main rubber and plastic materials in the fields of automobile and household appliances, such as the United States, Japan and Europe. Especially in the car has accounted for 3/4 of its total, with its manufacturing car bumper, has basically replaced the original metal and PU. In 1973, the TPO of dynamic partial vulcanization appeared, especially after the successful development of complete dynamic vulcanization TPO named Santoprere by Mansanto company in 1981, the performance was greatly improved, and the maximum temperature could reach 120℃. This dynamic vulcanization type TPO is called TPV for short. It is mainly used to add a crosslinking agent that can vulcanize the mixture of PP and EPDM in the TPO when it is mixed in the melt, and to make the particles of completely vulcanized fine EPDM crosslinked rubber fully dispersed in the PP matrix by using the force of high shear of mixer, screw machine and other machines. Through the "particle effect" of this cross-linked rubber, TPO's compression deformation resistance, heat aging resistance, oil resistance, etc. have been significantly improved, and even reached the level of CR rubber, so people call it thermoplastic vulcanized rubber.

　　3.Diene class TPE

　　Diene TPE is mainly isomers of natural rubber, so it is also known as thermoplastic trans natural rubber (1-nr). As early as 400 years ago, people as a natural rubber has been found this material, but because its production from the tree and three-leaf rubber different gutapo and balata wild trees, so called gutapo rubber, balata rubber. Although this t-nr has been used as submarine cable and golf ball leather for more than 100 years, its use has not been extended for a long time due to its thermoplastic state, strong crystallization and limited amount of supply.

　　The synthesis of T-NR- trans - isoprene rubber with organometallic catalyst is called TPI. Its microstructure is opposite to that of isoprene rubber (IR), with a trans-bonding of 99%, a crystallinity of 40%, and a melting point of 67℃, which is very similar to the natural gutapo and barata rubber. As a result, natural products have been gradually replaced and further developed for use in plastic surgery appliances, gypsum substitutes and sports protection equipment. In recent years, TPI has been successfully developed as a shape memory rubber material by virtue of its excellent crystallinity and temperature sensitivity.

　　Structurally, TPI is a thermoplastic rubber formed by combining the crystallinity of a high trans structure as a hard chain segment with the rest of the soft chain segments in the elastic phase state of any shape. Compared with other TPE, the advantage is good mechanical strength, injury resistance, and vulcanization, the disadvantage is the softening temperature is very low, generally only 40-70℃, the use is limited. BR rubber (cis-1, 4 polybutadiene) isomer - m-homolol, 2 polybutadiene, TPB for short. It is m-isopolybutadiene rubber with more than 90% l, 2-position binding, and is marketed as RB. The microstructural system is a block polymer composed of the crystal part of the same structure between the hard chain segment and the soft part of the soft chain segment. Although its heat resistance, mechanical strength is not as good as rubber, but with good transparency, weather resistance, electrical insulation and photodecomposition, widely used in shoes, sponge, light film and other industrial rubber products.

　　The biggest difference between TPB and other TPE is that it can be vulcanized. General TPE can not be vulcanized with sulfur, peroxides. But must use electronic wave, radiation and other special equipment. It can improve the problem of quality modification, thus improving TPE's heat resistance, oil resistance and poor durability. TPB can be processed within the range of melting point of 75-1 10℃. It can be used to produce non-vulcanized injection molding slippers and slippers, and can also use vulcanized foam to make middle soles of athletic shoes and travel shoes. Compared with EVA sponge midsole, it is not easy to collapse and deform, comfortable to wear, which is conducive to improving the sports effect. TPB film, with good air permeability, water resistance and transparency, is easy to decompose in light, very safe, especially suitable for families and vegetables, fruits fresh packaging.

　　4.Vinyl chloride TPE

　　Thermoplastic PVC and thermoplastic CPE into two categories, the former known as TPVC, the latter known as TCPE. TPVC is mainly a flexible modification of PVC, which can be divided into two forms: chemical polymerization and mechanical blending. Mechanical blending is mainly a blend of partially crosslinked NBR mixed with PVC (PVC/NBR). TPVC is actually an extension of soft PVC resin, just because the compression deformation has been greatly improved, thus forming a rubber-like PVC. This TPVC can be regarded as modified PVC and rubber substitutes, mainly used in the manufacture of rubber tubes, rubber plates, rubber cloth and some rubber pieces. At present, more than 70% of the consumption is in the automobile field, such as the steering wheel of the car, wiper strip and so on. For other USES, electric wires account for about 75% and waterproof film for buildings accounts for about 10%. In recent years, it has expanded to household appliances, horticulture, industry and raincoats for daily use.

　　5.Polyurethane TPE

　　Polyurethane TPE is a thermoplastic polyurethane rubber, or TPU for short, which is combined by hard chain segment of ammonia ester reacted with isocyanate and soft chain segment of polyester or polyether. TPU has excellent mechanical strength, abrasion resistance, oil resistance and flexural resistance, especially abrasion resistance. Shortcomings are heat resistance, heat resistance water, compression resistance is poor, the appearance of easy to yellow, easy to adhere to the mold processing. At present in Europe and the United States and other countries mainly used to manufacture ski boots, mountaineering boots and other sports goods, and a large number of production of various sports shoes, tourism shoes, consumption is very much. TPU can also produce automobile, machinery, watch and other parts through injection molding and extrusion, and a large number of high pressure hose (outer glue), pure hose, sheet, transmission belt, conveyor belt, wire and cable, tape and other products. Injection molding accounted for more than 40%, extrusion molding is about 35%.