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Polysiloxane acid imide foam and method for preparing same

A technology of polysiloxane imide and polysiloxane imide acid, which is applied in the field of polysiloxane imide foam and its preparation, can solve the problems that it is difficult to prepare bulk materials and foam materials, etc. Achieve the effect of good noise reduction performance, simple operation and excellent high temperature resistance

Inactive Publication Date: 2008-01-30
SHENZHEN HIFUTURE ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the preparation of silicon- or siloxane-containing monomers to some extent, but the method is difficult to use for the preparation of bulk materials and foams

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] About the preparation of ODPA / 4,4'-ODA system foam.

[0040] 1) Preparation of polysiloxane imide foam precursor

[0041]In a three-necked reaction flask equipped with a stirrer, 392 grams (y=1.96mol) of 4,4'-ODA was dissolved in a mixed solvent of 2400 grams of tetrahydrofuran and 800 grams of methanol, stirred to dissolve all the solids, and then in the Add 620 g (x=2.00 mol) ODPA to the solution, stir at 30°C for 10 to 12 hours, then add 18.0 g of γ-aminopropyltriethoxysilane for capping, and continue stirring for 3 to 5 hours until the reaction is complete , then add 30.0 grams of tetraethyl orthosilicate to react for 3 hours to 4 hours, finally add 30.0 grams of polymethylsiloxane and stir for 1 hour to 2 hours to form a homogeneous solution, and dry the solution at 70 ° C for 8 hours to 24 hours After grinding into powder, it is polysiloxane imide precursor powder.

[0042] 2) Foaming and imidization of polysiloxane imide precursor

[0043] 300 grams of the pow...

Embodiment 2

[0045] About the preparation of ODPA / 4,4'-ODA system foam.

[0046] 1) Preparation of polysiloxane imide foam precursor

[0047] The preparation method of the polysiloxaneimide foam precursor is the same as in Example 1.

[0048] 2) Foaming and imidization of polysiloxane imide precursor

[0049] 500 grams of the powder is pre-foamed into fragile microspheres at 140°C, and finally the microspheres are put into a high-temperature-resistant microporous breathable mold. Put it into a high-temperature heating furnace, heat at 250°C for 1 hour, and heat at 300°C for 1 hour, and cool to obtain polysiloxane imide foam.

Embodiment 3

[0051] About the preparation of ODPA / 4,4'-ODA system foam.

[0052] 1) Preparation of polysiloxane imide foam precursor

[0053] The preparation method of polysiloxane imide foam precursor is the same as embodiment 1

[0054] 2) Foaming and imidization of polysiloxane imide precursor

[0055] 1000 grams of the powder is pre-foamed into fragile microspheres at 140°C, and finally the microspheres are put into a high-temperature resistant microporous breathable mold. Put it into a high-temperature heating furnace, heat at 250°C for 1 hour, and heat at 300°C for 1 hour, and cool to obtain polysiloxane imide foam.

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Abstract

The invention relates to polysiloxane-imide foam and a preparation method thereof. The polysiloxane-imide foam is made by the steps: one or more than one sort of aromatic dianhydride is composed with one or more than one sort of aromatic diamine according to a certain proportion to get polyimide acid solution, then certain content of silicon-containing blocking agent, polysiloxane precursor and foam stabilizer are added sequentially, then the mixture is heated to remove small molecule volatiles so as to obtain polysiloxane precursor powder, then the powder is filled in a mould and frothed at high temperature to make soft elastic, semi-rigid and rigid polysiloxane-imide foam materials with a density of 0.01g / cm3-1.0g / cm3 and a glass transition temperature of 280 DEGC -350 DEG C. The polysiloxane-imide foam materials of the invention have good performances of high temperature resistance, low temperature resistance, flame retardancy, heat insulation and noise reduction and mechanical properties.

Description

technical field [0001] The invention relates to a polysiloxane imide foam and a preparation method thereof. Background technique [0002] The polysiloxane imide foam of the present invention is a foam prepared from polysiloxane polyimide, which belongs to the special engineering plastic of polyimide. [0003] Polyimide is a kind of polymer material with excellent comprehensive performance and outstanding heat resistance. It has been widely used in aviation, aerospace, microelectronics, nanometer, liquid crystal, separation membrane, laser and other fields. There are many kinds of polyimide products, mainly including: molding resins / parts, films, fibers, prepregs / composites, coatings, adhesives, soft and rigid foams, etc. [0004] The polyimide foam structural material not only maintains the heat resistance, flame retardancy, open flame resistance, no smoke, no halogen and ozone depletion of polyimide; it also has good flexibility and insulation properties of foam materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/04C08L79/08
Inventor 詹茂盛沈燕侠王凯
Owner SHENZHEN HIFUTURE ELECTRIC
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