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Preparation method for polyimide foam material

A foam material and polyimide technology, applied in the field of polymer material preparation, can solve problems such as poor thermal stability and mechanical properties, and achieve the effects of improved stability, stable control of foaming rate, and improved product stability

Inactive Publication Date: 2018-01-26
丁玉琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: Aiming at the problems of poor thermal stability and mechanical properties of traditional polyimide foam materials, a preparation method of polyimide foam materials is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Add calcium oxide and glycerin into the ball mill tank at a mass ratio of 20:1, and add zirconia ball milling beads at a mass ratio of 30:1, and mix for 4 hours to obtain ball mills, which are pretreated calcium oxide; In terms of parts, 20 parts of pyromellitic anhydride, 20 parts of polymethylene polyphenyl polyisocyanate, 150 parts of polar solvent, 10 parts of pretreated calcium oxide, 20 parts of water, 15 parts of absolute ethanol, 3 parts Parts of foam stabilizer, 6 parts of viscosity reducer, 3 parts of coupling agent; first add pyromellitic anhydride, polymethylene polyphenyl polyisocyanate and polar solvent into the reaction kettle, at a temperature of 75 ° C, the speed Under the condition of 400r / min, stir and react at a constant temperature for 4h to obtain a prepolymer; then mix the pretreated calcium oxide, absolute ethanol, foam stabilizer, viscosity reducer and coupling agent with a stirrer at a speed of 500r / min for 60min, A mixing aid was obtained; the...

example 2

[0024] In parts by weight, 20 parts of pyromellitic anhydride, 20 parts of polymethylene polyphenyl polyisocyanate, 150 parts of polar solvent, 20 parts of water, 15 parts of absolute ethanol, and 3 parts of foam stabilizer are taken successively. 6 parts of viscosity reducer, 3 parts of coupling agent; first add pyromellitic anhydride, polymethylene polyphenyl polyisocyanate and polar solvent into the reaction kettle, at a temperature of 75°C and a speed of 400r / min Under constant temperature, stirring and reacting for 4 hours, the prepolymer was obtained; then the absolute ethanol, foam stabilizer, viscosity reducer and coupling agent were stirred and mixed with a mixer at a speed of 500r / min for 60min, and the mixing aid was obtained; then the obtained prepolymer The body and the obtained mixing aid were added to a three-necked flask, and the three-necked flask was moved into an ice-water bath with a temperature of 4°C. Under the condition of a rotating speed of 600r / min, it...

example 3

[0026] In parts by weight, 20 parts of pyromellitic anhydride, 20 parts of polymethylene polyphenyl polyisocyanate, 150 parts of polar solvent, 10 parts of calcium oxide, 20 parts of water, 15 parts of dehydrated alcohol, 3 parts of Parts of foam stabilizer, 6 parts of viscosity reducer, 3 parts of coupling agent; first add pyromellitic anhydride, polymethylene polyphenyl polyisocyanate and polar solvent into the reaction kettle, at a temperature of 75 ° C, the speed Under the condition of 400r / min, stir and react at constant temperature for 4h to obtain a prepolymer; then stir and mix calcium oxide, absolute ethanol, foam stabilizer, viscosity reducer and coupling agent with a mixer at a speed of 500r / min for 60min to obtain a mixed Auxiliary agent; then add the obtained prepolymer and the obtained mixing auxiliary agent into a three-necked flask, and move the three-necked flask into an ice-water bath with a temperature of 4°C, and keep stirring and cooling at a constant tempera...

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Abstract

The invention discloses a preparation method for a polyimide foam material and belongs to the technical field of high polymer material preparation. According to the technical scheme disclosed by the invention, the method comprises the following steps: firstly, adding pyromellitic dianhydride, polyisocyanate and polar solvent into a reaction kettle; stirring and reacting under constant temperature,thereby acquiring a prepolymer; stirring and mixing calcium oxide, absolute ethyl alcohol, foam stabilizer, viscosity reducer and coupling agent, thereby acquiring a mixed additive; mixing the prepolymer with the mixed additive, cooling and then performing programmed heating; adding absolute ethyl alcohol and water under constant-temperature stirring state; reacting, thereby acquiring a sizing agent; and performing injection molding, programmed heating and curing, and then cooling and de-molding, thereby acquiring the polyimide foam material. The polyimide foam material prepared according tothe technical scheme provided by the invention is capable of promoting the thermal stability thereof, obviously promoting the mechanical properties thereof and promoting the popularization and application thereof in various fields.

Description

technical field [0001] The invention discloses a preparation method of a polyimide foam material, which belongs to the technical field of polymer material preparation. Background technique [0002] With the rapid development of aerospace, navigation and other scientific and technological fields, traditional foam plastics (such as PS, PU, ​​PVC, etc.) can no longer meet the requirements in terms of strength, stiffness and heat resistance, so the development of high-performance foam plastics has become the Research directions and hotspots in the field. The characteristics of materials used in aerospace and military ships are intrinsically flame retardant, environmentally friendly and non-toxic, wide temperature range, low thermal conductivity, radiation resistance, light weight, easy processing and installation, etc. Excellent comprehensive properties, It can serve for a long time under extreme conditions such as ultra-high temperature, ultra-low temperature, high salt spray,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08G18/32C08L79/08C08L75/04C08L91/00C08K9/04C08K3/26C08K5/42C08K5/544
Inventor 丁玉琴许蘅陈龙
Owner 丁玉琴
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