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Modified hyperbranched polyimide resin preparation and application

A technology of polyimide resin and polyamic acid, which is applied in the direction of adhesives, etc., can solve the problem of reduced bond strength and achieve the effect of improving mechanical properties without reducing bond strength

Inactive Publication Date: 2019-05-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the bond strength of the brake pad bonding heat insulation layer is reduced under high temperature conditions, the invention provides a modified hyperbranched polyimide resin

Method used

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  • Modified hyperbranched polyimide resin preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Add 2.5g of 2,4,6 triaminopyrimidine, 8.88g of hexafluorodianhydride and 50ml of DMF into a completely dry four-necked flask equipped with a water separator, stir and dissolve at 25°C and then heat up to 60°C , N 2 The reaction was stirred and reacted for 24 hours under protection to obtain a hyperbranched polyamic acid solution.

[0020] Step 2: Add 2.42 g of tris-hydroxymethylaminomethane monomer to the hyperbranched polyamic acid solution obtained in the first step, and react at 60° C. for 24 hours to obtain a modified hyperbranched polyamic acid solution.

[0021] Step 3: remove the solvent from the modified hyperbranched polyamic acid solution obtained in the second step and heat it to 160° C. to obtain a modified hyperbranched polyimide resin.

Embodiment 2

[0023] Step 1: Add 5.00g of 2,4,6-triaminopyrimidine, 17.76g of hexafluorodianhydride and 100ml of DMF into a completely dry four-necked flask equipped with a water separator, stir and dissolve at 25°C and heat up to 60°C , N 2 The reaction was stirred and reacted for 24 hours under protection to obtain a hyperbranched polyamic acid solution.

[0024] Step 2: Add 4.84 g of tris-hydroxymethylaminomethane monomer to the hyperbranched polyamic acid solution obtained in the first step, and react at 60° C. for 24 hours to obtain a modified hyperbranched polyamic acid solution.

[0025] Step 3: remove the solvent from the modified hyperbranched polyamic acid solution obtained in the second step and heat it to 160° C. to obtain a modified hyperbranched polyimide resin.

Embodiment 3

[0027] Step 1: Add 7.50g of 2,4,6 triaminopyrimidine, 26.64g of hexafluorodianhydride and 150ml of DMF into a completely dry four-neck flask equipped with a water separator, stir and dissolve at 25°C and heat up to 60°C , N 2 The reaction was stirred and reacted for 24 hours under protection to obtain a hyperbranched polyamic acid solution.

[0028] Step 2: Add 7.26 g of tris-hydroxymethylaminomethane monomer to the hyperbranched polyamic acid solution obtained in the first step, and react at 60° C. for 24 hours to obtain a modified hyperbranched polyamic acid solution.

[0029] Step 3: remove the solvent from the modified hyperbranched polyamic acid solution obtained in the second step and heat it to 160° C. to obtain a modified hyperbranched polyimide resin.

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Abstract

The invention relates to a hyperbranched polyimide resin preparation method and application. The method includes steps: subjecting a dianhydride monomer and a triamine monomer to condensation polymerization; then, performing imidization; finally, introducing trihydroxymethyl aminomethane for modification. Prepared modified hyperbranched polyimide resin has excellent performances of high temperature resistance, adhesiveness and heat insulation and can be applied to adhesion and heat insulation of automobile brake pads and metal plates.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a preparation method of a modified hyperbranched polyimide resin and its application in the field of bonding automobile brake pads. Background technique [0002] Automobile brake pads are generally composed of steel plates, adhesive insulation layers and friction blocks. The friction block is composed of friction material and adhesive, which is squeezed on the brake disc or brake drum to generate friction during braking, so as to achieve the purpose of deceleration and braking of the vehicle. The heat insulation layer is composed of non-heat-conducting materials, and its purpose is to insulate heat and bond the friction block and the steel plate tightly together. The bonded heat insulation layer of brake pads currently on the market mainly uses phenolic resin and nitrile rubber. However, phenolic resin is harmful to the environment, and its heat-resistant limit temperature is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C09J179/08
Inventor 寿崇琦张耀文王艳丽
Owner UNIV OF JINAN