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Method for preparing cross-linked polyamide in body one-pot method

A technology of cross-linking polyamide and body, applied in the field of polyamide, can solve problems such as complicated preparation process, and achieve the effect of simple process and excellent performance

Inactive Publication Date: 2019-02-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cross-linked polyamides are mainly synthesized by two methods at present: (1) ring-opening polymerization-cross-linking method, utilizing anionic ring-opening polymerization of caprolactam or laurolactam to synthesize linear polyamides, and then combining with polyacyl caprolactam (JP 02032128 A ) or caprolactam-terminated polyisocyanate (US 20130079465 A1) is prepared by cross-linking; this method needs to be carried out at high temperature, and the preparation process is complicated

Method used

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  • Method for preparing cross-linked polyamide in body one-pot method
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  • Method for preparing cross-linked polyamide in body one-pot method

Examples

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Embodiment 1

[0030] 1) Michael addition reaction: 116 parts of hexamethylenediamine and 344 parts of methyl acrylate were weighed by weight fraction, and reacted at 50°C for 3 hours to obtain a diamine polyester mixture.

[0031] 2) Preparation of cross-linked polyamide: heat up the diamine polyester mixture obtained in step 1) to 170°C and react at normal pressure for 2 hours under the protection of nitrogen. -25mmHg) for 9 hours to obtain a cross-linked polyamide with a tensile strength of 38 MPa and an elongation at break of 25%.

Embodiment 2

[0033] 1) Michael addition reaction: 116 parts of hexamethylenediamine and 129 parts of methyl acrylate were weighed by weight fraction, and reacted at 50° C. for 3 hours to obtain a mixture of diamine polyesters.

[0034] 2) Preparation of cross-linked polyamide: heat up the diamine polyester mixture obtained in step 1) in Example 2 to 170°C and react under normal pressure for 40 minutes under nitrogen protection. React in a vacuum oven (25-30 mmHg) for 9 hours to obtain a cross-linked polyamide with a tensile strength of 45 MPa and an elongation at break of 21%.

Embodiment 3

[0036] 1) Michael addition reaction: 116 parts of hexamethylenediamine and 86 parts of methyl acrylate were weighed by weight fraction, and reacted at 60° C. for 3 hours to obtain a mixture of diamine polyesters.

[0037] 2) Preparation of cross-linked polyamide: heat up the diamine polyester mixture obtained in step 1) in Example 3 to 150°C and react under normal pressure for 20 minutes under nitrogen protection. React in a vacuum oven for 9 hours to obtain a cross-linked polyamide with a tensile strength of 3 MPa and an elongation at break of 69%.

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Abstract

The invention relates to a method for preparing cross-linked polyamide in a body one-pot method, which belongs to the technical field of polyamide. Diamine and (methyl) acrylate have the body Michaeladdition to generate a diamine polyester mixture, and the diamine polyester is heated, molten and polycondensated to obtain the cross-linked polyamide. The method is mild in reaction conditions, easyin obtaining raw materials, simple in procedures and environment-friendly in process, and the obtained cross-linked polyamide is excellent in mechanical performance.

Description

technical field [0001] The invention establishes a method for preparing cross-linked polyamide by utilizing diamine and (meth)acrylic acid ester in one pot. The specific method is to generate a diamine polyester mixture through bulk Michael addition reaction of diamine and (meth)acrylic acid ester, and to prepare cross-linked polyamide through melting and polycondensation at elevated temperature, which belongs to the technical field of polyamide. technical background [0002] Polyamide is a kind of polymer material with excellent comprehensive properties. It has superior mechanical properties, high strength, good toughness, and has the characteristics of oil resistance and corrosion resistance. It can meet the needs of industries and has great room for development. Nowadays, ordinary polyamides are mainly linear structures, and the synthesis processes of linear polyamides are generally divided into two categories: (1) polycondensation of dibasic acids and diamines; (2) ring-...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08J5/18C08L79/02
CPCC08G73/028C08J5/18C08J2379/02
Inventor 赵京波杨胜青张军营
Owner BEIJING UNIV OF CHEM TECH
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