Method for preparing nano-silica-containing polyimide hybrid material

A technology of nano-silica and imitation leather, which is applied in the chemical industry and can solve problems affecting dimensional stability, affecting the quality and use of substrates, curling, warping or twisting of substrates, etc.

Inactive Publication Date: 2010-06-02
DONGGUAN UNIV OF TECH
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Problems solved by technology

Therefore, not only will it affect the dimensional stability, but it will also easily cause

Method used

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Embodiment

[0015] In a reaction kettle filled with nitrogen, ultrasonically mix 3% nano-silica, 1% coupling agent KH550 and 98% toluene for 30-60 minutes, stir at 140°C for 8 hours; cool down to normal temperature, and then Add 0.26% paraformaldehyde and 0.51% bisphenol A to the above sol, stir and heat up to 85°C, and react for 5-7 hours to obtain a transparent modified silica sol; under nitrogen protection, add 5% diamine mono PAPB and ODA were added into N, N-dimethylacetamide, and stirred for more than 2 minutes to completely dissolve them; The time interval is 20 minutes, and the polyamic acid solution is obtained by stirring for 5 hours; then the modified silica sol is added to the obtained polyamic acid solution, and stirred for 15 hours to obtain a mixed glue; finally, the prepared The obtained glue solution was placed at a temperature of 80° C., and was vacuum-dried for 4 hours, at a temperature of 150° C., for 2 hours, and at a temperature of 270° C., for 3 hours to obtain a na...

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Abstract

The invention provides a method for preparing nano-silica-containing polyimide hybrid material. The preparation method comprises the following steps: ultrasonically mixing nano-silica, coupling agents and toluene in a reaction kettle filled with nitrogen; stirring the mixture at a certain temperature to cool the mixture to room temperature; adding paraformaldehyde and the phenol to the sol so as to obtain transparent modified silica sol; adding diamine monomer PAPB and ODA to N,N-dimethylacetamide under nitrogen protection and stirring to completely dissolve the obtained product; adding an equimolar amount of pyromellitic dianhydride equally divided to the solution in two steps so as to obtain polyamide acid solution; adding the obtained modified silica sol to the obtained polyamide acid solution so as to obtain mixed glue solution; and placing the obtained glue solution at a certain temperature for vacuum drying so as to obtain the nano-silica-containing polyimide hybrid material. Compared with non-hybrid polyimide, the composite material synthesized by the method has better mechanical properties, thermal stability and lower coefficient of thermal expansion.

Description

technical field [0001] The invention relates to a preparation method of a polyimide hybrid material containing nano silicon dioxide in the field of chemical industry Background technique [0002] Aromatic polyimide (PI) has excellent dielectric properties, mechanical properties, thermal stability, oxidation stability, chemical resistance and radiation resistance, and has a wide range of applications. [0003] In recent years, electronic products have developed towards high performance and miniaturization, which requires electronic components and substrates on which they are mounted to also develop towards high performance and high density. [0004] General-purpose polyimide first prepares its prepolymer-polyamic acid, then forms a film, and is imidized at high temperature to form polyimide. The film has certain flexibility, strong mechanical properties and thermal stability, and has very broad application prospects in the electronics industry. [0005] However, during the ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08K9/04
Inventor 周显宏武秀文兰善红李纠蒋欣刘煜平
Owner DONGGUAN UNIV OF TECH
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