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Polyimide foam material and preparation method thereof

A technology of foam material and polyimide, which is applied in the field of polyimide foam material and its preparation, can solve problems such as cracking and high defective rate, achieve good application prospects, good temperature resistance and flame retardancy, and process The effect of good operability

Active Publication Date: 2016-11-23
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foam prepared by this method is very prone to cracking due to the discharge of a large amount of gas when the mold is unloaded, resulting in a high defective rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The present embodiment provides a kind of preparation method of polyimide foam material, wherein, this method comprises the following steps:

[0055] a. Synthesis of liquid A: take 3.12 kg of dimethylformamide, then add 4.83 kg of 3,3',4,4'-benzophenone tetra-acid dianhydride (BTDA) into it, and raise the temperature to 60°C. Add 460g of methanol, stir at constant temperature for 4 hours, and then add 580g of water. After the system is clarified, add catalyst triethanolamine 40g, stannous octoate 56g, silicone oil AK8805380g, stir well, cool down to room temperature, and put it into a small foaming machine A barrel ,stand-by;

[0056] b. Mix aromatic polyisocyanate PAPI and 4,4'-MDI at a mass ratio of 4:1, prepare 10kg of liquid B, and put it into the liquid B storage tank of the foaming machine;

[0057] c. Adjust the ratio of liquid A to liquid B to be 1:1, pour it into the plastic mold inside the pressure tank, inject the mixed solution for 4 seconds, then quickly c...

Embodiment 2

[0060] The present embodiment provides a kind of preparation method of polyimide foam material, wherein, this method comprises the following steps:

[0061] a. Synthesis of liquid A: Take 3.12 kg of dimethylformamide, then add 4.65 kg of 3,3',4,4'-diphenyl ether tetra-acid dianhydride (ODPA), heat up to 60°C, add 460g of methanol, stirred at constant temperature for 4 hours, then added 580g of water, after the system was clarified, added catalyst triethanolamine 46g, stannous octoate 69g, silicone oil DC193372g, stirred evenly, cooled to room temperature, and put it into a small foaming machine A barrel, stand-by;

[0062] B, mix aromatic polyisocyanate PAPI and PPDI with 4:1 mass ratio, prepare 10kg B liquid, pack in the B liquid storage tank of foaming machine;

[0063] c. Adjust the ratio of liquid A to liquid B to be 1:1, pour it into the plastic mold in the pressure tank, inject the mixed solution for 4 seconds, then quickly close the valve of the pressure vessel, inject...

Embodiment 3

[0066] The present embodiment provides a kind of preparation method of polyimide foam material, wherein, this method comprises the following steps:

[0067] a. Synthesis of liquid A: Take 3.12kg of dimethylformamide, and then add 3.22kgkg of 3,3',4,4'-benzophenone tetra-acid dianhydride (BTDA) and 1.09kg1,2, For 4,5-pyromellitic dianhydride (PMDA), heat up to 60°C, add 460g of methanol, stir at constant temperature for 4 hours, then add 580g of water, and then add catalyst triethanolamine 32g, 1,2-dimethyl 16g of imidazole, 56g of stannous octoate, 380g of silicone oil AK8805, stir evenly, cool down to room temperature, put into small foaming machine A barrel, and set aside;

[0068] B, the aromatic polyisocyanate PAPI (recorded as B liquid) 10kg is packed in the B liquid storage tank of foaming machine;

[0069] c. Adjust the ratio of liquid A to liquid B to be 1:1, pour it into the plastic mold in the pressure tank, inject the mixed solution for 4 seconds, then quickly clos...

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Abstract

The invention provides a polyimide foam material and a preparation method thereof. The method includes the following steps that aromatic dianhydride is added into a polar solvent and heated to be dissolved, and then fatty alcohol is added; a catalyst, water and a foam stabilizer are added, and a transparent polyimide foam precursor solution is obtained and recorded as a solution A; the solution A and aromatic polyisocyanate are mixed in the mass ratio of 1:(0.3-2), a mixed solution is obtained, the mixed solution is put into a pressure vessel, the pressure is rapidly supplemented to set pressure with gas, foaming is carried out under the set pressure, and after foaming is finished, non-imidized foam is obtained; the non-imidized foam is subjected to heat treatment to remove the solvent, the foam with the solvent removed is heated for imidization treatment, and the polyimide foam material is obtained. According to method, the density of the polyimide foam material can be regulated by regulating the pressure, and thus the polyimide foam material with the varying density can be easily obtained through the method.

Description

technical field [0001] The invention relates to a polyimide foam material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Polyimide foam material is a high-performance foam material with good mechanical properties, excellent flame retardant properties, and fire resistance. Compared with other types of foam plastics, it does not produce harmful gases during use and has a low density. , a wide range of performance adjustment, easy to install and disassemble, high temperature resistance, but also has excellent low temperature brittleness and other characteristics, has been widely used as heat insulation and noise reduction materials abroad. [0003] At present, there are two main methods for industrialized preparation of polyimide foam materials, one is a two-step method based on aromatic dianhydride and aromatic diamine as the main raw materials, and the other is based on aromatic dianhydride and aromatic d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J9/12C08L79/08
CPCC08G73/1035C08G2101/00C08J9/125C08J2379/08
Inventor 酒永斌翟宇翟彤曹巍刘暘李伯龙王连才曾心苗
Owner BEIJING RADIATION APPL RES CENT
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