Polyacrylic imide foam material, and preparation method and application thereof

A technology of polyacrylimide and foam materials, applied in the field of polyacrylimide foam materials, can solve the problem that it is difficult to effectively control the release rate of free radical polymerization heat, and achieve high compressive strength and closed cell ratio. High and high temperature resistance performance

Active Publication Date: 2015-11-25
CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the preparation mechanism of PMI foam is free radical copolymerization, on the one hand, free radical initiation requires endothermic reaction, and on the other hand, free radical polymerization is an exothermic reaction. Therefore, in the actual production process, combined initiation polymerization is very difficult. Difficult to effectively control the release rate of free radical polymerization heat

Method used

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  • Polyacrylic imide foam material, and preparation method and application thereof
  • Polyacrylic imide foam material, and preparation method and application thereof
  • Polyacrylic imide foam material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 50 parts of methacrylic acid, 50 parts of methacrylonitrile, 20 parts of PMR ester ammonium salt 1, 3 parts of AIBN, 10 parts of TBPO, 5 parts of formamide, and 30 parts of amyl alcohol into a three-necked glass flask in sequence, , stirred at room temperature for 2 to 3 hours to form a homogeneous solution;

[0052] Transfer the above homogeneous solution to a mold consisting of 2 glass plates and a sealant frame, and polymerize under the following conditions: 80-90°C / 36-48 hours, 100-140°C / 48-60 hours to obtain a foam preform Polymer copolymer resin board;

[0053] Foaming the foam prepolymer copolymer resin plate obtained above at 200-220° C. to obtain a polyacrylimide foam plate blank;

[0054] The above obtained polyacrylimide foam board blank is machined to obtain a polyacrylimide foam material with a density of 110kg / m 3 , The cells are uniform, and the deformation at 180°C / 0.5MPa / 2h is 0.3%. After heat treatment (HT) at 190°C / 48h, the deformation at 180°C / ...

Embodiment 2

[0056] Add 50 parts of methacrylic acid, 45 parts of methacrylonitrile, 10 parts of PMR ester ammonium salt 3, 10 parts of TBPO, 8 parts of formamide, and 30 parts of isopropanol into a three-necked glass flask in sequence, under nitrogen protection, at room temperature Stir for 2 to 3 hours to form a homogeneous solution;

[0057] Transfer the above homogeneous solution to a mold consisting of 2 glass plates and a sealant frame, and polymerize under the following conditions: 80-90°C / 36-48 hours, 100-140°C / 48-60 hours to obtain a foam preform Polymer copolymer resin board;

[0058] Foaming the foam prepolymer copolymer resin plate obtained above at 200-220° C. to obtain a polyacrylimide foam plate blank;

[0059] The above obtained polyacrylimide foam board blank is machined to obtain a polyacrylimide foam material with a density of 50kg / m 3 , The cells are uniform, and the deformation at 130°C / 0.3MPa / 2h is 0.3%. After heat treatment (HT) at 190°C / 48h, the deformation at 150...

Embodiment 3

[0071] Add 50 parts of methacrylic acid, 50 parts of acrylonitrile, 15 parts of PMR ester ammonium salt 12, 5 parts of CABN, 10 parts of TAPB, 3 parts of formamide, 2 parts of carbonamide, 20 parts of tert-butanol, and 5 parts of water into In a three-necked glass flask, under the protection of nitrogen, stir at room temperature for 2 to 3 hours to form a homogeneous solution;

[0072] Transfer the above homogeneous solution to a mold consisting of 2 glass plates and a sealant frame, and polymerize under the following conditions: 80-90°C / 36-48 hours, 100-140°C / 48-60 hours to obtain a foam preform Polymer copolymer resin board;

[0073] Foaming the foam prepolymer copolymer resin plate obtained above at 200-220° C. to obtain a polyacrylimide foam plate blank;

[0074] The above obtained polyacrylimide foam board blank is machined to obtain a polyacrylimide foam material with a density of 75kg / m 3 , The cells are uniform, and the deformation at 150°C / 0.3MPa / 2h is 0.5%. After h...

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Abstract

The invention relates to a polyacrylic imide foam material prepared by an esterquat precursor, and a preparation method and application of the polyacrylic imide foam material. In a preparation process of polyacrylic imide foam prepolymer, the esterquat precursor of PMR type polyimide is added, endothermic reaction of amidation of the esterquat precursor is matched with exothermic reaction of free radical polymerization in the preparation process of the polyacrylic imide foam prepolymer, and the purpose of effectively controlling reaction speed of polyacrylic imide is achieved. The prepared polyacrylic imide foam material has the advantages of high closed porosity, good high-temperature resistance and high compression resistance. The density of prepared foam is 30-250kg/m (3), closed porosity is greater than 90%, and a glass transition temperature is greater than 220 DEG C. At a room temperature, the density of the prepared foam is greater than 110kg/m (3), and compression strength of the foam is greater than 3.0MPa; and at a high temperature of 180 DEG C and under pressure of 0.3MPa, the compression deformation rate of the foam of which the density is 110kg/m (3) is lower than 1% after the foam is technologically treated for 2 hours.

Description

technical field [0001] The invention belongs to the technical field of polyacrylimide foam materials, and in particular relates to a polyacrylimide foam material prepared by using an ester ammonium salt precursor, a preparation method and an application thereof. Background technique [0002] Polyacrylimide (PMI) foam first appeared in the 1960s. PMI foam was first invented by Dr. Schroeder Guenter of Germany in 1961, and successfully developed and commercialized by Rohm and Hass Co., Ltd. in 1972. Compared with other foam materials, the special structure of the dimethyl hexaimide ring in the PMI molecular chain endows it with better heat resistance stability, high specific strength, high specific modulus, and easy thermoforming , good anti-compression creep performance and anti-fatigue performance, 100% closed cells, low dielectric constant and no harmful substances released during combustion, etc. Blades and other fields are widely used. [0003] Subsequently, many domes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/44C08F8/32C08J9/02
Inventor 杨士勇胡爱军李克迪王志媛方勇张剑星
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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