Introduction of TPEE plastic materials
TPEE (thermoplastic polyester elastomer) is a block copolymer containing a hard segment of polyester and a soft segment of polyether. The polyether soft segment and the uncrystallized polyester form an amorphous phase. The hard segment of the polyester partially crystallizes to form a crystalline microdomain, which functions as a physical crosslinking point. TPEE has the elasticity of rubber and the strength of engineering plastics; the soft section gives it elasticity, making it like rubber; the hard section gives it processing properties, making it like plastic; it has better processing properties and longer than rubber. Service life; compared with engineering plastics, it also has high strength and flexibility and dynamic mechanical properties.
Through the adjustment of the ratio of soft and hard sections, the hardness of TPEE can be from 30-82D of Shore, and its elasticity and strength are between rubber and plastic. Compared to other thermoplastic elastomers, the TPEE modulus is higher than other thermoplastic elastomers of the same hardness under low strain conditions. When modulus is an important design condition, TPEE can reduce the cross-sectional area of the product and reduce the amount of material. TPEE has a very high tensile strength. Compared with polyurethane (TPU), TPEE compressive modulus and tensile modulus are much higher. The same part can be subjected to larger loads with the same hardness of TPEE and TPU. Above room temperature, TPEE has a high flexural modulus, and at low temperatures, it is not as hard as TPU, so it is suitable for making cantilever beams or torque-type parts, especially suitable for making high-temperature parts. TPEE has low temperature flexibility and low temperature notched impact strength is superior to other TPEs, and wear resistance is comparable to TPU. Under low strain conditions, TPEE has excellent fatigue resistance and low loss of Shield. This feature combined with high elasticity makes this material an ideal material for multiple cycles of load use, gears, rollers, and flexibility. Couplings and belts can be used.
TPEE has excellent heat resistance, the higher the hardness, the better the heat resistance; TPEE does not lose weight after continuous heating for 10h at 110~140°C, and is heated at 160°C and 180°C for 10h respectively, and the weight loss is only 0.05% and 0.1%. Therefore, the use temperature of TPEE is very high, and the short-term use temperature is higher, which can adapt to the baking temperature of the automobile production line (150-160 ° C), and its mechanical performance loss at low and low temperatures is small. TPEE is used above 120 °C, its tensile strength is much higher than TPU. In addition, TPEE also has excellent low temperature resistance, TPEE brittle point is lower than -70 °C and the lower the hardness, the better the cold resistance, most TPEE can be - Long-term use at 40 °C. Due to the balanced performance of TPEE at high and low temperatures, it has a wide operating temperature range and can be used at -70 to 200 °C.
TPEE has excellent oil resistance and is resistant to most polar liquid chemical media (such as acids, bases, amine glycols) at room temperature, but does not work for halogenated hydrocarbons (except Freon) and phenols. Its ability to withstand chemicals increases as its hardness increases. TPEE is good for the swelling resistance and permeability resistance of most organic solvents, fuels and gases. The fuel permeability is only 1/3~1 of oil resistant rubber such as neoprene, chlorosulfonated polyethylene and nitrile rubber. /300 But TPEE has poor hot water resistance, and the addition of polycarbimide stabilizer can significantly improve its hydrolysis resistance.
TPEE has excellent chemical stability under many different conditions, such as water mist, ozone, outdoor atmospheric aging. Like most elastomers, degradation occurs under UV light. Therefore, for outdoor applications or products exposed to sunlight, UV protection additives should be added to the formulation, including carbon black and various pigments or other shielding materials. In addition, TPEE also has varying degrees of hydrolysis.
Excellent creep and fatigue resistance;
High impact resistance and excellent elasticity at low temperatures;
Strong chemical resistance, oil resistance and excellent heat resistance of various solvents (160 ° C);
Good mechanical properties;
Can be attached to ABS, PC, PVC, etc.;
Easy processing and excellent coloration;
Main application areas:
Widely used in the automotive industry, electrical and electronic industry, industrial parts and sporting goods, etc. For example, for the production of automotive airbag cover, car intake pipe, skate wheel, high and low temperature wire sheath and high-grade silent gear, etc. This product has been successfully adopted by Hyundai Motor and Kia Motors in the industrial field. TPEE is mainly used in fields requiring shock absorption, impact resistance, flex resistance, sealing and elasticity, oil resistance, chemical resistance and sufficient strength. Such as: polymer modification, automotive parts, high and low temperature resistant wire sheath, hydraulic hose, shoe material, transmission belt, rotating molded tire, flexible coupling, silencer gear, elevator slide, chemical equipment pipeline valve Anti-corrosion and wear-resistant high and low temperature materials.
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