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A kind of organosilicon modified thermoplastic polyurethane elastomer and preparation method thereof

A thermoplastic polyurethane and elastomer technology, which is applied in the field of organosilicon-modified thermoplastic polyurethane elastomer and its preparation, can solve the problems of poor water resistance of TPU, poor heat resistance of TPU, and poor thermal stability of groups, etc. Water and thermal stability, good structural regularity, water resistance improvement effect

Active Publication Date: 2020-12-15
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The molecular structure of TPU contains a large amount of urethane bond (-NH-COO-) structure formed by the reaction, and the excess isocyanate can further react with the urethane and urea formed by the reaction to form allophanate and urea respectively. Biuret structure, although this can improve the mechanical properties of the elastomer, but the thermal stability of these groups is poor, so the heat resistance of TPU is poor, in general, its long-term use temperature can not exceed 80 ° C, short-term The use temperature cannot exceed 120°C; in addition, TPU has poor performance in water resistance, and these deficiencies limit the application range of TPU

Method used

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  • A kind of organosilicon modified thermoplastic polyurethane elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Put 20 parts by weight of polypropylene glycol with a molecular weight of 1000 into the reactor, raise the temperature to about 100°C, vacuum dehydrate it for 2 hours, then cool it down to 50°C and stop vacuuming, add 2 parts by weight of dry polypropylene glycol with a molecular weight of 1000 butyl-terminated polydimethylsiloxane, 10 parts by weight of melted 4,4'-diphenylmethane diisocyanate, stirred rapidly, and after the temperature was stabilized, slowly raised the temperature and controlled the reaction temperature at 70°C , measure the content of NCO in the prepolymer with the di-n-butylamine method every 0.5h, after the NCO content is stable, connect the vacuum device and carry out vacuum degassing for 0.5h, obtain the thermoplastic polyurethane elastomer prepolymer; The degree of vacuum is 0.5kPa.

[0027] (2) Mix 5 parts by weight of 1,4-butanediol, 0.1 part by weight of dibutyltin dilaurate, 0.1 part by weight of Irganox1010 and 0.1 part by weight of Tin...

Embodiment 2

[0029] (1) Put 40 parts by weight of polybutylene adipate with a molecular weight of 2000 into the reactor, heat up to about 120°C, vacuum dehydrate for 4 hours, then cool it down to 60°C and stop vacuuming, add 5 wt. Parts dry molecular weight is 2000 terminal butyl-terminated polydimethylsiloxane, 15 parts by weight of melted hexamethylene diisocyanate, stirring rapidly, after the temperature stabilizes, slowly heat up and control the reaction temperature at 80 ℃, measure the content of NCO in the prepolymer by the di-n-butylamine method every 0.5h, after the NCO content is stable, connect the vacuum device to carry out vacuum degassing for 1h, and obtain the thermoplastic polyurethane elastomer prepolymer; The degree of vacuum is 0.1kPa.

[0030] (2) 8 parts by weight of 3,3'-dichloro-4,4'-diphenylmethanediamine, 0.2 parts by weight of stannous octoate, 0.2 parts by weight of Irganox1076 and 0.1 parts by weight of Tinuvin571 are mixed uniformly, and then added to the step (...

Embodiment 3

[0032] (1) Put 60 parts by weight of polytetrahydrofuran diol with a molecular weight of 3000 into the reactor, heat up to about 110°C, vacuum dehydrate for 3 hours, then cool it down to 55°C and stop vacuuming, add 10 parts by weight of dry polytetrahydrofuran diol 3000 hydroxypropyl-terminated polydimethylsiloxane, 20 parts by weight of melted 4,4'-dicyclohexylmethane diisocyanate, stirred rapidly, and after the temperature was stabilized, the temperature was slowly raised and the reaction temperature was controlled at 90 ℃, measure the content of NCO in the prepolymer by the di-n-butylamine method every 0.5h, after the NCO content is stable, connect the vacuum device to carry out vacuum degassing for 1h, and obtain the thermoplastic polyurethane elastomer prepolymer; The degree of vacuum is 0.3kPa.

[0033] (2) Mix 6 parts by weight of 1,4-butanediol, 0.5 parts by weight of dibutyltin dilaurate, 0.5 parts by weight of Irganox1010 and 0.5 parts by weight of Tinuvin770, and t...

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Abstract

The invention belongs to the field of high polymer material research, and provides an organic silicon modified thermoplastic polyurethane elastomer (TPU) in order to overcome the defects of poor temperature resistance and hydrophobic property of the existing TPU. The elastomer consists of the following components in parts by weight: 20-60 parts of macromolecular dihydric alcohol, 2-10 parts of terminal hydroxyalkyl end-blocked polydimethylsiloxane, 10-20 parts of diisocyanate, 2-8 parts of a micromolecular chain extender, 0.1-0.5 part of a catalyst, 0.1-0.5 part of an antioxidant and 0.1-0.5 part of an ultraviolet light absorber. Due to the unique chemical structure and composition, organic silicon has a series of excellent properties, such as high temperature and low temperature resistance and hydrophobic property, which just can make up the defects of the TPU. The invention also provides a preparation method of the elastomer, the preparation method adopts a prepolymer two-step process and is less in side reaction, and the prepared TPU is good in structural regularity.

Description

technical field [0001] The invention belongs to the field of polymer material research, and in particular relates to an organosilicon-modified thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (hereinafter referred to as TPU) is a linear polymer material polymerized from macromolecular diols, diisocyanates and small molecular diols or diamines. TPU is a block copolymer. The soft segment is formed by the reaction of diisocyanate and macromolecular diol, and the hard segment is formed by the reaction of diisocyanate and small molecule diol. The alternating molecular structure of soft segment and hard segment forms a microphase region. And produce microscopic phase separation; in addition, due to the existence of a large number of polar groups, hydrogen bonds can be formed within and between molecules of TPU to generate physical cross-linking points, so when deformed, there will be no slidin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/61C08G18/12
CPCC08G18/12C08G18/4009C08G18/4238C08G18/4825C08G18/61C08G18/3206C08G18/3814
Inventor 钱涛刘海龙刘海兵
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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