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A semi-aromatic polyamide thermoplastic elastomer and its continuous production method

A thermoplastic elastomer and semi-aromatic technology, applied in the field of thermoplastic elastomers, can solve the problems of low activity of aromatic diamines, high price of isocyanate, and decline in product performance, achieving short residence time, short reaction time, and reduced reaction time. the effect of time

Active Publication Date: 2021-08-03
ZHEJIANG NHU SPECIAL MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the low activity of aromatic diamines leads to long production time of semi-aromatic polyamide elastomers, and prolonged stay under high temperature conditions will lead to the decomposition of soft segments, resulting in a decrease in the performance of the final product
However, the products produced by the isocyanate method are not suitable for food and pharmaceutical applications, and the price of isocyanate is relatively high. The production process requires the use of a large amount of polar solvents, which is troublesome and polluting after treatment.

Method used

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  • A semi-aromatic polyamide thermoplastic elastomer and its continuous production method
  • A semi-aromatic polyamide thermoplastic elastomer and its continuous production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The 20 % sodium hydrogen hypophosphite aqueous solution and 5.29kg / h of water are dropped into the batching kettle together, and form slurry by continuous beating at 50°C. The slurry is pumped to the salt-forming tank and heated to 130°C by the steam generated during the dehydration process to dissolve into salt. Then it is pressurized to 0.7MPa by the pump and then sent to the dehydrator for dehydration. The dehydration temperature is controlled at 200°C, the water content is controlled at 15%, the dehydration residence time is 30min, and the steam from the dehydrator is used as the heat source of the salt forming kettle. Then use a pump to pressurize to 10MPa, transport the material to the preheater (heat exchanger) to preheat to 280 ° C, and the residence time is 5min; the prepolymerization reaction liquid is decompressed to 0.2MPa by the pressure reducing valve and then enters the flash evaporator. After the flash evaporation, the molten liquid material is decompre...

Embodiment 2

[0066] The 20 % sodium hydrogen hypophosphite aqueous solution and 5.29kg / h of water are dropped into the batching kettle together, and form slurry by continuous beating at 50°C. The slurry is pumped to the salt-forming tank and heated to 130°C by the steam generated during the dehydration process to dissolve into salt. Then it is pressurized to 0.7MPa by the pump and then sent to the dehydrator for dehydration. The dehydration temperature is controlled at 200°C, the water content is controlled at 15%, the dehydration residence time is 30min, and the steam from the dehydrator is used as the heat source of the salt forming kettle. Then use a pump to pressurize to 10MPa, transport the material to the preheater (heat exchanger) to preheat to 280 ° C, and the residence time is 5min; the prepolymerization reaction liquid is decompressed to 0.2MPa by the pressure reducing valve and then enters the flash evaporator. After the flash evaporation, the molten liquid material is decompre...

Embodiment 3

[0068] The 20 % sodium hydrogen hypophosphite aqueous solution and 5.29kg / h of water are dropped into the batching kettle together, and form slurry by continuous beating at 50°C. The slurry is pumped to the salt-forming tank and heated to 130°C by the steam generated during the dehydration process to dissolve into salt. Then it is pressurized to 0.7MPa by the pump and then sent to the dehydrator for dehydration. The dehydration temperature is controlled at 200°C, the water content is controlled at 15%, the dehydration residence time is 30min, and the steam from the dehydrator is used as the heat source of the salt forming kettle. Then use a pump to pressurize to 10MPa, transport the material to the preheater (heat exchanger) to preheat to 280 ° C, and the residence time is 5min; the prepolymerization reaction liquid is decompressed to 0.2MPa by the pressure reducing valve and then enters the flash evaporator. After the flash evaporation, the molten liquid material is decompre...

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Abstract

The invention discloses a continuous production method of a semi-aromatic polyamide thermoplastic elastomer, comprising: mixing an aromatic dibasic acid, a diamine and a molecular weight regulator with water and a catalyst to form a slurry, and then dissolving by heating A salt solution is formed; the molecular weight regulator is selected from dibasic acid monoesters; the salt solution prepared in the previous step is dehydrated and subjected to a prepolymerization reaction, and the obtained prepolymerization reaction solution is flashed; the flashed product and the polymer The post-polycondensation reaction of polyol is completed under the action of transesterification catalyst. The invention uses non-toxic and cheap aromatic dibasic acid as raw material to prepare semi-aromatic polyamide thermoplastic elastomer, the production process has high reactivity, short reaction time, melt system reaction, does not use organic solvent, and is environmentally friendly; The prepared semi-aromatic polyamide thermoplastic elastomer is mainly terminated by ester groups, has excellent thermodynamic and mechanical properties, and also has excellent hydrolysis resistance.

Description

technical field [0001] The invention relates to the technical field of thermoplastic elastomers, in particular to a semi-aromatic polyamide thermoplastic elastomer and a continuous production method thereof. Background technique [0002] Thermoplastic Elastomer (Thermalplastic Elastomer, TPE) is composed of resin segment (hard segment) and rubber segment (soft segment) with different chemical compositions. It is a polymer material between resin and rubber and taking into account the characteristics of rubber and thermoplastics. , known as the third generation of rubber materials. The force between the hard segments is sufficient to form a physical "cross-link", and the soft segment is a highly elastic chain segment with greater free rotation ability; and the soft and hard segments are arranged in an appropriate order and connected in an appropriate way. The cross-linking of hard segments (such as intermolecular hydrogen bonds) is physical cross-linking and is reversible: at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/28C08G69/44C08G69/40
CPCC08G69/28C08G69/40C08G69/44
Inventor 杜维元邓杭军周贵阳朱丹琪吴笑笑洪文刚沈金涛
Owner ZHEJIANG NHU SPECIAL MATERIALS