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Thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property and preparation method of thermoplastic polyurethane elastomer

A thermoplastic polyurethane and elastomer technology, applied in the field of polyurethane materials, can solve the problems of reduction, reduced mechanical properties, and impact on use, and achieves the effects of good mechanical properties, large intermolecular forces, excellent ultra-low temperature resistance and mechanical properties.

Pending Publication Date: 2022-01-28
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, the low temperature resistance and mechanical properties of TPU are contradictory. When the soft segment content increases, the hard segment content decreases relatively. At this time, the flexibility of the TPU chain segment is good, and the low temperature resistance performance is improved, but its mechanical properties will decrease
The TPU synthesized in the prior art cannot take into account the excellent low temperature resistance and mechanical properties at the same time, which affects its use in the field of extreme low temperature

Method used

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  • Thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property and preparation method of thermoplastic polyurethane elastomer
  • Thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property and preparation method of thermoplastic polyurethane elastomer
  • Thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property and preparation method of thermoplastic polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Take 50.0g of polytetrahydrofuran ether diol (molecular weight: 2000) and dehydrate it under vacuum condition at 120°C for 2h, then pass it through Ar for protection, cool down to 60°C, add 8.3277g of 4,4'-dicyclohexylmethane diisocyanate, After 1 hour of reaction, 0.0020 g of dibutyltin dilaurate as a catalyst was added, and after 3 hours of reaction to obtain a polyurethane prepolymer, 100 g of dehydrated tetrahydrofuran was added, and the temperature was lowered to 0° C. in an ice-water bath. Dissolve 0.4959 g of imidazoline in tetrahydrofuran, transfer to a constant pressure dropping funnel and add dropwise to the polyurethane prepolymer solution, and the dropwise addition ends after 1 hour. The reaction was continued for 3 hours at room temperature, injected into a mold, placed at room temperature for 12 hours, and then transferred to an oven at 70°C to dry for 4 days to obtain a thermoplastic polyurethane elastomer.

Embodiment 2

[0050] Take 50.0g of polytetrahydrofuran ether diol (molecular weight: 2000) and dehydrate it under vacuum condition at 120°C for 2h, then pass it through Ar protection, cool down to 80°C, add 8.2772g of 4,4'-dicyclohexylmethane diisocyanate, After 1 hour of reaction, 0.0020 g of dibutyltin dilaurate as a catalyst was added, and after 2 hours of reaction to obtain a polyurethane prepolymer, 110 g of dehydrated toluene was added, and the temperature was lowered to 0° C. in an ice-water bath. Dissolve 0.5513g of piperazine in toluene, transfer to a constant pressure dropping funnel and add dropwise to the polyurethane prepolymer solution, and the dropwise addition ends in 1h. The reaction was continued for 2 hours at room temperature, injected into a mold, placed at room temperature for 12 hours, and then transferred to an oven at 60°C for 7 days to obtain a thermoplastic polyurethane elastomer.

Embodiment 3

[0052] Take 50.0g of polytetrahydrofuran ether diol (molecular weight: 2000) and dehydrate it under vacuum condition at 120°C for 2h, then pass it through Ar for protection, cool down to 60°C, add 10.8371g of 4,4'-dicyclohexylmethane diisocyanate, After 1 hour of reaction, 0.0026 g of dibutyltin dilaurate as a catalyst was added, and after 3 hours of reaction to obtain a polyurethane prepolymer, 100 g of dehydrated tetrahydrofuran was added, and the temperature was lowered to 0° C. in an ice-water bath. Dissolve 1.6629 g of 2-methylpiperazine in toluene, transfer it to a constant pressure dropping funnel and add it dropwise to the polyurethane prepolymer solution, and the addition ends after 1 hour. The reaction was continued for 2 hours at room temperature, injected into a mold, placed at room temperature for 12 hours, and then transferred to an oven at 80°C to dry for 2 days to obtain a thermoplastic polyurethane elastomer.

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Abstract

The invention relates to a thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property and a preparation method of the thermoplastic polyurethane elastomer, and belongs to the field of polyurethane materials. A soft chain segment of the thermoplastic polyurethane elastomer is composed of polytetrahydrofuran ether glycol, and a hard chain segment of the thermoplastic polyurethane elastomer is composed of 4, 4'-dicyclohexylmethane diisocyanate and a novel small-molecule binary secondary amine cyclic chain extender. The thermoplastic polyurethane elastomer with ultralow temperature resistance and high mechanical property is prepared by a two-step method through solution polymerization. The synthesis method is simple, the glass transition temperature can be as low as -104 DEG C, and the material is suitable for an extremely cold environment; and meanwhile, the mechanical property of the thermoplastic polyurethane elastomer is also considered, and the tensile strength reaches up to 47 MPa.

Description

technical field [0001] The invention relates to the field of polyurethane materials, in particular to a thermoplastic polyurethane elastomer with ultra-low temperature resistance and high mechanical properties and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) is a linear polymer formed by the copolymerization of soft and hard segments. The synthetic raw materials are all bifunctional. In addition to the high elasticity of rubber and the high strength of plastics, It is also fusible and soluble, and is widely used in the fields of national defense and national economy such as aerospace, medical equipment, ships, automobiles, and decorative materials. It has successfully ranked among the world's sixth largest synthetic materials. [0003] Due to the thermodynamic incompatibility of the soft segment and hard segment of TPU, the soft segment phase and the hard segment phase can be aggregated to form independent micro-domai...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/10C08G18/32
CPCC08G18/6685C08G18/4854C08G18/10C08G18/758C08G18/3246
Inventor 刘锋耿燕斐
Owner ZHENGZHOU UNIV
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