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Method for preparing phenolic foam containing expanded graphite

A technology of expanded graphite and phenolic foam, which is applied in the field of polymer foam materials, can solve the problems of brittleness and easy slag drop, poor mechanical properties of phenolic foam, etc., and achieve the effects of low cost, good mechanical properties, and wide sources

Active Publication Date: 2016-05-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention can effectively improve the disadvantages of poor mechanical properties of the phenolic foam, high brittleness and easy slag drop, improve the mechanical properties of the phenolic foam, and make the phenolic foam have wider application prospects

Method used

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  • Method for preparing phenolic foam containing expanded graphite

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Effect test

Embodiment 1

[0028] A preparation method of phenolic foam containing expanded graphite, the method may further comprise the steps:

[0029] (1) Add 100mg of polyacrylic acid and 100mg of N,N'-dicyclohexylcarbodiimide to 50ml of expanded graphite tetrahydrofuran solution with a mass concentration of 0.1% (the particle size of expanded graphite is 100 mesh), and after ultrasonic mixing for 0.5h , at N 2 Protected, under the condition of 60°C, magnetically stirred for 4h, the product was washed with tetrahydrofuran for 3 times and dried to obtain polyacrylic acid-modified expanded graphite;

[0030] (2) 100 mg of polyacrylic acid-modified expanded graphite and 100 mg of N, N'-dicyclohexylcarbodiimide prepared in step (1) were dispersed in 100 mL of anhydrous tetrahydrofuran, and ultrasonically dispersed for 1 h, then in N 2 Under protective conditions, add the dispersion liquid dropwise to 2.8g γ-glycidoxypropyltrimethoxysilane, stir at 60°C for 4h, centrifuge and dry to obtain γ-glycidoxypr...

Embodiment 2

[0035] A preparation method of phenolic foam containing expanded graphite, the method may further comprise the steps:

[0036](1) 100mg polyacrylic acid, 100mgN, N'-dicyclohexylcarbodiimide was added to 50ml mass concentration of 5% expanded graphite tetrahydrofuran solution (the particle size of expanded graphite was 200 mesh), after ultrasonic mixing for 2h, in N 2 Protected, under the condition of 50°C, magnetically stirred for 10h, the product was washed twice with tetrahydrofuran and dried to obtain polyacrylic acid-modified expanded graphite;

[0037] (2) 100 mg of polyacrylic acid-modified expanded graphite and 150 mg of N, N'-dicyclohexylcarbodiimide prepared in step (1) were dispersed in 100 mL of anhydrous tetrahydrofuran, and ultrasonically dispersed for 1 h, then in N 2 Under protective conditions, add the dispersion liquid dropwise to 7.5g γ-glycidoxypropyltrimethoxysilane, stir at 60°C for 4h, centrifuge and dry to obtain γ-glycidoxypropyltrimethoxysilane Expan...

Embodiment 3

[0041] A preparation method of phenolic foam containing expanded graphite, the method may further comprise the steps:

[0042] (1) 100mg polyacrylic acid, 100mgN, N'-dicyclohexylcarbodiimide was added to 50ml mass concentration of 0.5% expanded graphite tetrahydrofuran solution (the particle size of expanded graphite was 500 mesh), after ultrasonic mixing for 1h, in N 2 Protected, under the condition of 70°C, magnetically stirred for 8 hours, the product was washed with tetrahydrofuran for 5 times and dried to obtain polyacrylic acid-modified expanded graphite;

[0043] (2) 100 mg of polyacrylic acid-modified expanded graphite and 200 mg of N, N'-dicyclohexylcarbodiimide prepared in step (1) were dispersed in 100 mL of anhydrous tetrahydrofuran, and ultrasonically dispersed for 1 h, then in N 2 Under protective conditions, add the dispersion liquid dropwise to 5g γ-glycidoxypropyl trimethoxysilane, stir at 60°C for 4 hours, centrifuge and dry to obtain γ-glycidoxypropyl trime...

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Abstract

The invention discloses a method for preparing phenolic foam containing expanded graphite. According to the method, firstly, polyacrylic acid is adopted to modify expanded graphite; secondly, gamma-epoxy propoxy propyl trimethoxy silane is adopted to modify expanded graphite so that silane modified expanded graphite alkene can be prepared; finally, phenolic resin containing expanded graphite is prepared through reaction between phenol and paraformaldehyde, and phenolic foam is further prepared. By means of the method, the defects that the mechanical property of phenolic foam is poor, fragility is large, and dreg falling occurs frequently can be effectively improved, the mechanical property of phenolic foam is improved, and phenolic foam has a wider application prospect range.

Description

technical field [0001] The invention relates to polymer foam materials, in particular to a method for preparing phenolic resin and phenolic foam by using modified expanded graphite. Background technique [0002] Phenolic foam is one of the most widely used flame retardant insulation materials. Phenolic foam has many excellent properties, such as high temperature resistance, heat resistance, stable structure, low smoke, and flame retardancy. Phenolic foam has abundant raw materials and simple production process. The cost is low, and the cost of phenolic foam is only two-thirds of that of polyurethane foam. The quality of phenolic foam is light, but its specific strength is large, and its size is relatively stable. It can even be used for a long time at -30°C, and the dimensional change rate at this time is only 1%, and the phenolic foam can be used at a high temperature of 150°C for a long time. Conditions of use. Phenolic foam related products are very versatile and are use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08L61/10C08K9/06C08K7/24C08K3/04C08K3/22C08G8/10
CPCC08G8/10C08J9/145C08J2361/10C08L61/06C08L2201/02C08L2203/14C08L2205/03C08L83/04C08K9/06C08K7/24C08K3/04C08K2003/2227
Inventor 俞科静钱坤卢雪峰孙洁肖学良罗霞
Owner JIANGNAN UNIV
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