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Contacts:Elena
Phone:+86-769-88029572
Skype:china.elena22
E-mail:china_elena@163.com
Address:No. 138, First Sutong Road, Dajingjiu Plastic Market, Changping Town, Dongguan City, Guangdong Province, China

The main characteristics of the TPU


TPU main features are:
Hardness range: by changing the ratio of TPU reaction components, you can get different hardness of products, and with the increase in hardness, its products still maintain good flexibility and abrasion resistance.
High mechanical strength: outstanding carrying capacity TPU products, impact resistance and damping performance. TPU
Cold outstanding: TPU relatively low glass transition temperature, at minus 35 degrees still maintain good flexibility, flexibility and other physical properties.
Processing performance: TPU processing methods may be common thermoplastic material processing, such as injection molding, extrusion, calendering and the like. At the same time, TPU polymer materials with certain properties can be processed together complementary polymer alloy.
Oil, water, mold-resistant.
Recycling is good.
TPU elastomer is interposed as a material between rubber and plastic, which look out from its rigidity, the rigidity of the elastic modulus of the TPU can be measured. Elastic modulus of the rubber is generally 1 ~ 10Mpa, TPU at 10 ~ 1000Mpa, plastics (nylon, ABS, PC, POM) in 1000 ~ 10000Mpa. TPU relatively wide hardness range from Shore A 60 ~ Shore D 80 and a high elasticity over the entire hardness range; TPU over a wide temperature range of -40 ~ 120 ℃, has flexibility, without the need for a plasticizer; TPU of oil (mineral oil, animal and vegetable oils and lubricants), and many have good solvent resistance; TPU as well as good weather resistance, extremely excellent resistance to high-energy radiation properties. Known as wear resistance, tear resistance, yield strength are scrambling excellent; high tensile strength, elongation, low long-term compression set and other significant advantages are the TPU.
TPU performance presented here consists of three areas: mechanical properties, physical properties and environmental performance.
1. Mechanical properties: mechanical properties of TPU elastomers include: hardness, tensile strength, compressive properties, tear strength, resilience and wear resistance, Qu immunity, etc., and the mechanical properties of TPU flexible plastic, in addition to these performance, there are high shear strength and impact energy and so on.
(A) Hardness: Hardness is an indicator material resist deformation, nicks and scratches ability. TPU with Shore hardness is usually A (Shore A) and Shore D (shore D) hardness tester, TPU, Shore D Shore A is used for softer harder TPU. Hardness is mainly determined by the content of hard segment TPU structure, hard segment content is higher, the hardness of the TPU will rise. After the increase in hardness, other properties of TPU will change, increasing the tensile modulus and tear strength, rigidity and compressive stress (load capacity) to increase, decrease elongation, increase the density and dynamic heat, increasing environmental resistance. TPU hardness and temperature there is a relationship. Cooling from room temperature to changes in temperature (-4 ~ -12 ℃), no significant change in hardness; mutation temperature, TPU sudden increase in the hardness becomes hard and loses its elasticity, which is a result of the soft segment crystallization.
(B) the relationship between hardness and modulus and hardness and tear strength of the relationship between stress and elongation. With the increase of TPU hardness, 100% modulus and 300% modulus increased rapidly, the elongation decreased. This is mainly due to the hard segment content increases result: high hard segment content, they form the hard phase segment times more easy to form crystals or crystalline structure increases the number of physical crosslinking limit material deformation. Ruoshi deformation of the material must be increased stress, thereby improving modulus while elongation decreased. Relationship TPU hardness and tear strength, hardness increased with the rapid increase in tear strength, modulus, and also on the grounds of the same explanation.
TPU formulations and performance may be very many kinds of permutations and combinations. But in reality the design and formulation of industrial production, but because the raw materials (polyol and isocyanate and chain extender) mutual restraints, so that truly is very difficult for very high-end R & D applications.
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