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Method for preparing PA6 polyamide thermoplastic elastomer

A thermoplastic elastomer and polyamide technology, which is applied in the field of preparation of PA6 series polyamide thermoplastic elastomer, can solve the problems of high purity requirements of reaction raw materials, low polymer molecular weight, difficult reaction control, etc., and achieves high polymer molecular weight, Easy to react and reduce volatilization effect

Active Publication Date: 2014-05-07
FUJIAN JINJIANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrolysis ring-opening method needs to add volatile and toxic substances isocyanate at high temperature, which will cause harm to experimenters
However, the anion polymerization method has the disadvantages that the reaction is not easy to control, the purity of the reaction raw materials is high, the molecular weight of the polymer is not high, and the product performance is general.

Method used

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  • Method for preparing PA6 polyamide thermoplastic elastomer
  • Method for preparing PA6 polyamide thermoplastic elastomer
  • Method for preparing PA6 polyamide thermoplastic elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1000g of PTMG with a molecular weight of 2000 and 348.32g of TDI into the polymerization kettle A, at 70 ° C and N 2 Under protective conditions, react for 3h, cool down to 50°C, add a mixed solution of 200ml of DMF and PMDA (109.06g), and continue to react for 6h to obtain heat-resistant modified polyurethane.

[0020] Add 2000g caprolactam, 100g aminocaproic acid, 12.5g adipic acid, 25g SEED to the polymerization kettle B, at 250°C and N 2 Under protective conditions, the reaction was carried out for 8h. That is to obtain low molecular weight PA6.

[0021] The prepared heat-resistant modified polyurethane was added to the polymerization kettle B in an amount of 20% by mass, and reacted for 3 hours to obtain a PA6 series polyamide thermoplastic elastomer. The tensile strength is 37MPa, the elongation at break is 300%, and the Shore hardness is 55D.

Embodiment 2

[0023] 1000g of PTMG with a molecular weight of 1000 and 348.32g of MDI were added to the polymerization kettle A, at 70°C and N 2 Under protective conditions, react for 3h, cool down to 50°C, add a mixed solution of 200ml of DMF and PMDA (109.06g), and continue to react for 6h to obtain heat-resistant modified polyurethane.

[0024] Add 2000g caprolactam, 100g aminocaproic acid, 6.25g adipic acid, 25g SEED to the polymerization kettle B, at 250°C and N 2 Under protective conditions, the reaction was carried out for 8h. That is to obtain low molecular weight PA6.

[0025] The prepared heat-resistant modified polyurethane was added to the polymerization kettle B in an amount of 30% by mass, and reacted for 3 hours to obtain a PA6 series polyamide thermoplastic elastomer. The tensile strength is 45MPa, the elongation at break is 200%, and the Shore hardness is 70D.

Embodiment 3

[0027] Add 1000g PTMG and 348.32g TDI to the polymerization kettle A, at 70 ° C and N 2 Under protective conditions, react for 3h, cool down to 50°C, add a mixed solution of 200ml of DMF and PMDA (109.06g), and continue to react for 6h to obtain heat-resistant modified polyurethane.

[0028] Add 2000g caprolactam, 100g aminocaproic acid, 12.5g adipic acid, 25g SEED to the polymerization kettle B, at 250°C and N 2 Under protective conditions, the reaction was carried out for 8h. That is to obtain low molecular weight PA6.

[0029] The prepared heat-resistant modified polyurethane was added to the polymerization kettle B in an amount of 50% by mass, and reacted for 3 hours to obtain a PA6 series polyamide thermoplastic elastomer. The tensile strength is 24MPa, the elongation at break is 500%, and the Shore hardness is 35D.

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Abstract

The invention discloses a method for preparing a PA6 polyamide thermoplastic elastomer material. The polyamide elastomer comprises heat-resisting modified polyurethane and low molecular weight PA6 prepolymer with a carboxylation end, according to mass fraction, wherein the heat-resisting modified polyurethane accounts for 10%-60% of the total mass of the polymer, and the hard segment of the low molecular weight PA6 prepolymer with the carboxylation end accounts for 40%-90% of the total mass of the polymer. The low molecular weight PA6 with the carboxylation end is prepared by hydrolysis ring opening polymerization and forms soft segment prepolymer with the heat-resisting modified polyurethane, after 5-6 hours of nucleophilic reaction at high temperature, the polymer is obtained, and the polymer is extracted by boiling water and is dried so as to obtain the final product. The PA6 polyamide thermoplastic elastomer has high strength, strong wear resistance, good elasticity, adjustable hardness, simple technology, and strong practicability, and offsets the defects of the prior art.

Description

technical field [0001] The invention relates to a preparation method of PA6 series polyamide thermoplastic elastomer; in particular, it relates to a preparation method for generating PA6 series polyamide thermoplastic elastomer through nucleophilic reaction of heat-resistant polyurethane prepolymer and terminal carboxylated low molecular weight PA6. Background technique [0002] Polyamide thermoplastic elastomer is a thermoplastic elastomer with excellent properties and a wide range of uses. Combination of hard segments consisting of polyamide and soft segment blocks consisting of polyether or polyester. Its synthesis methods are divided into two categories: one is hydrolysis ring-opening method; the other is anionic polymerization method. Patent 101747510A and patent CN101735451A respectively disclose a method and a method for preparing block copolymer thermoplastic elastomer by esterification and polycondensation of block hard segment and polyether soft segment composed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/60C08G18/48C08G18/10C08G69/16
CPCC08G18/10C08G18/603C08G18/6692C08G69/16C08G18/346
Inventor 李杰吴华新易春旺刘静坤胡嘉丽周丽娜金爱萍邓永秀
Owner FUJIAN JINJIANG TECH