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High hardness thermoplastic polyurethane elastomer and preparation method thereof

A technology of thermoplastic polyurethane and high hardness, which is applied in the field of thermoplastic polyurethane elastomer and its preparation, and can solve problems such as difficulty in realizing the shape recovery function of thermoplastic materials, insufficient phase separation of soft and hard segments, and reduction of crosslinking structure between molecular chains. Achieve excellent processability, improve heat resistance and lower melting point

Active Publication Date: 2022-02-08
ZHEJIANG HUAFENG THERMOPLASTIC POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some application fields, high-hardness thermoplastic polyurethane elastomers are required to maintain a good elastic modulus in water-soaked conditions for a long time for use, while the elastic modulus of ordinary thermoplastic polyurethane elastomers drops significantly in water-soaked environments
In addition, for high-hardness thermoplastic polyurethane elastomers, as the content of hard segments increases, the phase separation of soft and hard segments is insufficient, and the cross-linking structure between molecular chains decreases, making it difficult to achieve the shape recovery that some thermoplastic materials can have. Function

Method used

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  • High hardness thermoplastic polyurethane elastomer and preparation method thereof
  • High hardness thermoplastic polyurethane elastomer and preparation method thereof
  • High hardness thermoplastic polyurethane elastomer and preparation method thereof

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preparation example Construction

[0059] The preparation of the embodiments of the present invention all adopts the same preparation steps, specifically including the following steps:

[0060] (1) Heat the polyol (a) to 150°C, and when it is completely melted, add the polyol (b) and stir well to form component A;

[0061] Among them, if a catalyst or additive is added, it is added in step (1) and blended with component A;

[0062] (2) Heat the diisocyanate to 50°C and form component B after melting completely;

[0063] (3) Heat the diol to 50°C to form component C;

[0064] (4) Mix components A, B and C and add them to the front of the extruder for polymerization reaction. The reaction temperature is 210°C. When components A, B and C start to react, Then add monohydric alcohol in the middle section to continue the reaction, the above-mentioned reaction time is 5 min, and finally cool down to below the thermoplastic polyurethane melting point temperature to obtain a high-hardness thermoplastic polyurethane el...

Embodiment 1

[0071] Weigh the following raw materials in parts by weight:

[0072] 57.6 parts of diisocyanate

[0073] Polyol (a) 15.1 parts

[0074] Polyol (b) 3 parts

[0075] 26.3 parts of dihydric alcohol

[0076] Monohydric alcohol 2 parts

[0077] in:

[0078] Diisocyanate is diphenylmethane diisocyanate, polyol (a) is polybutylene adipate with a number average molecular weight of 2000 g / mol, polyol (b) is trimethylolpropane, diol It is 1,6-hexanediol, and the monohydric alcohol is 1-stearyl alcohol;

Embodiment 2

[0080] Weigh the following raw materials in parts by weight:

[0081] 49.5 parts of diisocyanate

[0082] Polyol (a) 27.7 parts

[0083] Polyol (b) 5 parts

[0084] 21.7 parts of dihydric alcohol

[0085] Monohydric alcohol 4 parts

[0086] in:

[0087] Diisocyanate is diphenylmethane diisocyanate, polyol (a) is polybutylene adipate with a number average molecular weight of 2000 g / mol, polyol (b) is trimethylolpropane, diol It is 1,6-hexanediol, and the monohydric alcohol is 1-stearyl alcohol;

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Abstract

The invention discloses a high-hardness thermoplastic polyurethane elastomer and a preparation method thereof, which are prepared by reacting the following components by mass: 45-65 parts of diisocyanate, 8-35 parts of polyol (a), and polyol (b ) 2~5 parts, diol 20~35 parts, monohydric alcohol 1~5 parts. Benefits of the present invention: the obtained thermoplastic polyurethane elastomer still has excellent processability even at high hardness, and the elastic modulus of the obtained high-hardness thermoplastic polyurethane elastomer does not significantly decrease after soaking in water for a long time, and it is unexpectedly found that , under certain temperature conditions and has the function of shape recovery.

Description

technical field [0001] The invention relates to a thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer molecules are mainly composed of soft segments and hard segments, and the soft segments and hard segments have a tendency to spontaneously separate in thermodynamics, forming a soft segment phase and a hard segment phase. The hard segment acts as a physical cross-linking point phase to endow thermoplastic polyurethane with strength, and the soft segment phase endows thermoplastic polyurethane with elastic body. The synthesis of thermoplastic polyurethane elastomer mainly involves three raw materials: polyisocyanate, oligomer polyol (ammonia) and chain-extending crosslinking agent. Each raw material has a lot of choices, which gives thermoplastic polyurethane elastomer a very Rich options and designability. The hardness range of elastomers is very wide, and the hardness ranges from Shore 5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/28C08G18/48
CPCC08G18/6644C08G18/2825C08G18/3206C08G18/4238C08G18/6677C08G18/4854C08G18/4277
Inventor 施龙敏陈斌马肥李俊江袁仁能陈光静陈明
Owner ZHEJIANG HUAFENG THERMOPLASTIC POLYURETHANE
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