TPU material as elastomer is a material between rubber and plastic

TPU material oil resistant, water resistant, resistant to mildew. The characteristic of TPU material recycling. TPU as elastomer is a material between rubber and plastic, it from its rigidity, rigidity of TPU can be made of elastic modulus is measured. Rubber elastic modulus is usually in ~ 0 mpa, TPU in 0 ~ 000 mpa, plastics ( Nylon, ABS, PC, POM) In 000 ~ 0000 mpa. TPU hardness range is wide, from the Shore A 60 to Shore D 80 and in the entire hardness range with high elasticity; TPU in wide temperature range 40 ~ 20 ℃, with flexible, without the need for a plasticizer; TPU to oil ( Mineral oil, animal and plant oils and lubricating oil) And many solvents have good resistance ability; TPU and good weather resistance, excellent high energy ray resistance. Known as abrasion resistance, tear resistance, bending strength is good; High tensile strength, elongation, long-term low compression permanent deformation rate are the obvious advantages of TPU. Here are the TPU properties including three aspects: mechanical properties, physical properties and environmental performance. 。 Mechanical properties: the mechanical properties of TPU elastomer mainly includes: hardness, tensile strength, compression performance, tear strength, resilience and wear-resisting performance, flexor interference resistance, etc. , and the mechanical properties of TPU elastic plastic, in addition to these performance, and higher shear strength and impact energy, etc. （ 一) Hardness: hardness material deformation resistance, a measure of the ability of the nicks and scratches. TPU hardness usually use Shao Er A ( 海岸) And Shao Er D ( 海岸D) Determination of hardness tester, Shao Er used to compare A soft TPU, Shao Er D for harder TPU. Hardness is mainly composed of hard segment content of TPU structure, hard segment content, the higher the TPU hardness will rise. Hardness after rising, TPU other performance will also change, increase tensile modulus and tearing strength, rigidity and compressive stress ( Load capacity) , reduce elongation and density and dynamic heat production increase, the environmental resistance increase. There is a certain relationship between hardness and temperature of TPU. From room temperature cooling temperature cooled to mutations ( - 4 ~ - 2℃） No obvious change, hardness; Mutations in temperatures, TPU hardness increases suddenly become very hard and loss of elasticity, this is because the soft segment the results of the crystallization. （ b） Hardness and stretch stress and elongation of the relationship and the relationship between hardness and tear strength. With the increase of TPU hardness, 00% stretch stress and stretch stress increased rapidly, 300% elongation decreased. This is mainly due to the increase of hard segment content, results: the high hard segment content, the formation of hard segment is more easy to form crystal or crystalline structure to increase the number of physical crosslinking and limit material deformation. If make the material deformation must improve stress, so as to improve the stretching stress and elongation decreased at the same time. TPU hardness and tear strength, with the increase of hardness and tear strength increased rapidly, its reason is the same as the modulus of explanation. The formula and properties of TPU can be carried out so many kinds of permutation and combination. But in the real design formula and the industrial production, but will because of raw materials, More than multivariate alcohol and isocyanate and chain extender) Mutual restriction, which can be used for high end real application development is very difficult.