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Preparation method of high-hardness thermoplastic polyurethane elastomer

A technology of thermoplastic polyurethane and polyurethane prepolymer, which is applied in the field of preparation of high-hardness thermoplastic polyurethane elastomer, can solve the problems of low permanent deformation rate, narrow processing temperature range, brittle TPU, etc., and achieve good stability and good comprehensive performance. and processability, excellent heat resistance effect

Active Publication Date: 2014-09-24
苏州奥斯汀新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness range of TPU is quite wide, from Shao A60 to Shao D80 and has high elasticity throughout the hardness range; TPU has good flexibility in a wide temperature range (-40 to 120); TPU also has good weather resistance, Excellent resistance to high-energy rays, and its abrasion resistance, tear resistance, and bending strength are excellent; high tensile strength, high elongation, and low long-term compression set rate are all significant features of TPU. However, when the hardness of TPU reaches a certain value (Shore D50-80), its processing performance will deteriorate, which greatly limits the application of high-hardness TPU, so the development of high-hardness TPU with excellent processing performance has become a research topic. Hotspots in
High-hardness TPU has a high content of hard segments and a high degree of aggregation of hard segments, which makes TPU brittle, and the processing temperature range is generally narrow, resulting in defects in the product and easy dents on the surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 270g of polyadipate-3-methyl-1,5-pentanediol ester diol with a number average molecular weight of 2000 into a 1L reactor, raise the temperature to 150°C at a speed of 20°C / min, and the vacuum degree reaches -0.085MPa, Dehydration at this temperature for 2h. It was then cooled to 75°C, and the vacuum was relieved by blowing nitrogen. Add 260g of TODI into the polyol (TODI needs to be heated to 80°C in advance and kept at a constant temperature), stop the reaction when the NCO% content reaches 12%, to obtain a polyurethane prepolymer, and put it in a vacuum oven at 80°C for heat preservation. Get 20g of polyester diol with a number average molecular weight of 600, 30g of 1,4-butanediol, 5g of trimethylolpropane, 0.1g of bismuth isooctanoate, 2,6-di-tert-butyl-4-methylphenol 0.36g and 0.144g of 2-hydroxy-4-methoxybenzophenone were mechanically stirred at 1200-2000rpm for 10-60s, and when the exothermic temperature reached 70-130°C, the reaction was stopped to obtain a...

Embodiment 2

[0031] Add 230 g of polybutylene adipate with a number average molecular weight of 3000 to a 1-liter reactor, raise the temperature to 150 °C at a rate of 20 °C / min, and vacuum to -0.085 MPa, and dehydrate at this temperature for 2 hours. Then it was cooled to 80°C, and the vacuum was relieved by blowing nitrogen gas. Add 260g of TODI into the polyol (TODI needs to be heated to 80°C in advance and kept at a constant temperature), stop the reaction when the NCO% content reaches 18%, and obtain a polyurethane prepolymer, which is then kept in a vacuum oven at 80°C. Take 15g of polyester diol with a number average molecular weight of 400, 40g of 1,4 butanediol, add 8g of 2-methyl-1,3-propanediol, 0.06g of tetrabutyl titanate, tetrakis (4-hydroxy-3, 0.36g of 5-tert-butylphenylpropionate) pentaerythritol ester, 0.144g of 2-hydroxy-4-methoxybenzophenone and mechanical stirring at 1200-2000rpm for 10-60s, when the exothermic temperature reaches 70-130℃ , to stop the reaction to obta...

Embodiment 3

[0034] Add 180g of poly-1,6-hexanediol adipate with a number average molecular weight of 2000 into a 1-liter reactor, raise the temperature to 150°C at a rate of 20°C / min, and vacuum to -0.085MPa, and dehydrate at this temperature for 2 hours . It was then cooled to 85°C, and the vacuum was relieved by blowing nitrogen. Add 260g of TODI into the polyol (TODI needs to be heated to 80°C in advance and kept at a constant temperature), stop the reaction when the NCO% content reaches 23%, to obtain a polyurethane prepolymer, and put it in a vacuum oven at 80°C for heat preservation. Get the polyester diol 10g that the number average molecular weight is 200, add new diol 50g, 1,3-bis(2-hydroxyethoxy) benzene 6g, stannous octoate 0.04g, 2,6-di-tert-butyl- 0.36g of 4-methylphenol, 0.144g of 2,2'-dihydroxy-4-methoxybenzophenone, stir mechanically at 1200-2000rpm for 10-60s, stop when the exothermic temperature reaches 70-130℃ reaction to obtain thermoplastic polyurethane elastomer. ...

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Abstract

The invention discloses a preparation method of a high hardness polyurethane thermoplastic elastomer. The method comprises the following steps: 1) adding polyester macromolecular dihydric alcohol and a catalyst into a reaction kettle, heating for a vacuum dehydration reaction, then adding 3-3-di methyl-4,4-biphenyl diisocyanate, and conducting heating reaction to obtain a polyurethane prepolymer; and 2) heating and melting the polyester macromolecular dihydric alcohol, catalyst, a chain extender, an antioxidant and a light stabilizer, and fully mixing the mixture with the polyurethane prepolymer obtained in the step 1) to obtain a thermoplastic polyurethane elastomer; and conducting post curing to obtain the high hardness thermoplastic polyurethane elastomer. The high hardness thermoplastic polyurethane elastomer prepared by the method disclosed by the invention can be used in the occasions of guide roller frames, brassie, machinery parts, seals or auto parts, has good comprehensive properties and processing properties, and is an environment-friendly product used as a substitute for general plastics and part of the engineering plastics.

Description

technical field [0001] The invention relates to a preparation method of a thermoplastic polyurethane elastomer, in particular to a preparation method of a high-hardness thermoplastic polyurethane elastomer. Background technique [0002] Thermoplastic polyurethane elastomer (also known as TPU) new material is called "epoch-making new polymer material" and is one of the six most promising synthetic materials in the world. [0003] TPU is a (AB) n-type block linear or a small amount of branched, cross-linked polymer material. The hardness range of TPU is quite wide, from Shao A60 to Shao D80 and has high elasticity throughout the hardness range; TPU has good flexibility in a wide temperature range (-40 to 120); TPU also has good weather resistance, Excellent resistance to high-energy rays, and its abrasion resistance, tear resistance, and bending strength are excellent; high tensile strength, high elongation, and low long-term compression set rate are all significant features ...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/10
CPCC08G18/10C08G18/7685C08G18/6674
Inventor 艾玲汪泽恒杨廷廷陈海风
Owner 苏州奥斯汀新材料科技有限公司
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