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A kind of halogen-free flame-retardant polyimide foam material and preparation method thereof

A polyimide and foam material technology, applied in the field of halogen-free flame retardant polyimide foam material and its preparation, can solve the secondary hazards of toxic gas and corrosive gas, the thickening effect of liquid raw materials, and the blockage of conveying pipelines. and other problems, to achieve the effect of facilitating production and maintenance, simple mixing and preparation process, and reducing pressure

Active Publication Date: 2021-07-27
CHANGZHOU TIANSHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems existing in the prior art that the use of solid flame retardants will cause uneven dispersion in the foam, thickening effect on liquid raw materials, blockage of pipelines or residues on pipe walls, etc. Toxic gas and corrosive gas secondary hazards will be produced when the agent is burned

Method used

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  • A kind of halogen-free flame-retardant polyimide foam material and preparation method thereof
  • A kind of halogen-free flame-retardant polyimide foam material and preparation method thereof
  • A kind of halogen-free flame-retardant polyimide foam material and preparation method thereof

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preparation example Construction

[0042]A preparation method of a halogen-free flame-retardant polyimide foam material, comprising the following steps:

[0043] Step 1: Pour isocyanate into tank A;

[0044] Step 2: Dissolving the aromatic dianhydride in the solvent;

[0045] Step 3: Add foaming agent and flame retardant to the solution prepared in Step 2, stir well and pour into tank B;

[0046] Step 4: Stir the foam stabilizer and catalyst evenly and pour them into tank C;

[0047] Step 5: Stir tanks A, B and C respectively, and then remove the air in the raw materials through vacuuming and nitrogen ventilation;

[0048] Step 6: Control the flow of material tanks A, B, and C by computer, inject them into the mold car for foaming after high-speed mixing in a closed mixing chamber, and then perform microwave treatment or heat treatment to prepare the polyimide foam material.

[0049] As a preferred preferred embodiment of the present invention, step 2 is specifically adding the formulated amount of dianhydr...

Embodiment 1

[0055] The polyimide foam material was prepared according to the formula of 20wt% isocyanate, 50wt% aromatic dianhydride, 15wt% solvent, 2wt% blowing agent, 5wt% flame retardant, 5wt% foam stabilizer and 3wt% catalyst. Specifically, 20 parts of polyaromatic isocyanate (PMDI) is poured into tank A. Take 20 parts of 3,3',4,4'-biphenyl dianhydride, 10 parts of 3,3',4,4'-benzophenone tetracarboxylic dianhydride and 20 parts of 4,4'-diphenyl ether dianhydride , was added to 15 parts of N-methylpyrrolidone, and stirred at 110°C until the solid was completely dissolved. Then wait for the solution to cool down to 35°C, add 1 part of water, 1 part of ethylene glycol-600, 3 parts of diphenyl phosphate and 2 parts of octyldiphenyl phosphite, stir well and pour it into the B material tank. Take 2 copies of DC198, 3 copies of B8487, 2 copies 8154 and 1 copy A-33, stir evenly and pour into C material tank. Set the stirring speed of material tank A to 500rpm, the stirring speed of mate...

Embodiment 2

[0057] According to the formula 50wt% of isocyanate, 20wt% of aromatic dianhydride, 18wt% of solvent, 4wt% of blowing agent, 1wt% of flame retardant, 6wt% of foam stabilizer, and 1wt% of catalyst to prepare polyimide foam material. Specifically, 30 parts of diphenylmethane diisocyanate (MDI), 10 parts of methyl diisocyanate (TDI) and 10 parts of hexamethylene diisocyanate (HDI) were poured into the material tank A. Add 20 parts of 2,3,3',4'-diphenyl ether tetracarboxylic dianhydride into a mixed solvent of 9 parts of dimethyl sulfoxide and 9 parts of ethanol, and stir at 92°C until the solid is completely dissolved. Then wait for the solution to cool to 20°C, add 1 part of methanol, 2 parts of n-pentane, 1 part of tetrahydrofuran, 0.5 part of trioleyl phosphate and 0.5 part of m-phenylene tetraphenyl bisphosphate, stir well and pour into B in the tank. Take 4 copies of DC6154, 2 copies L-620, 0.5 parts 5 and 0.5 parts -15, Stir evenly and pour into C material tank. Set...

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Abstract

The invention provides a halogen-free flame-retardant polyimide foam material and its preparation method. A closed injection machine controlled by a computer is used to precisely control the flow rate of each raw material, so that the raw materials are directly injected into the upper opening after being mixed at a high speed in a closed mixing chamber. It is foamed in a fixed-size mold car with a mouth, and then driven through a guide rail into a large microwave oven and a heating oven for further heating and curing, and finally a halogen-free flame-retardant polyimide foam material that can be continuously prepared is obtained. The invention only adds liquid halogen-free flame retardants, adopts liquid foaming one-step method to prepare polyimide foam materials, and the mixing and preparation process is simple, avoiding uneven dispersion of solid flame retardants such as powder or flakes, and damage to liquid raw materials Thickening effect, blockage of pipeline or pipe wall residue, etc., and also avoid the problem of toxic corrosive gas produced by halogen-containing flame retardants. The prepared foam material has the characteristics of uniform cell size distribution, excellent heat resistance, mechanical properties, flame retardancy and smoke suppression, and the like.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a halogen-free flame-retardant polyimide foam material and a preparation method thereof. Background technique [0002] Polyimide foam material was invented in the 1960s, along with the emergence and growth of lightweight composite materials such as sound absorption and thermal insulation in high-tech fields such as missiles, rockets, liquefied natural gas pipelines, space shuttles and low-temperature fuel storage tanks. develop. In recent years, developed countries have carried out research on "low-cost technology" of polyimide foam materials, while domestic research on polyimide foam materials is still relatively concentrated in scientific research institutes and universities, which can continuously produce high-performance polyimide foam materials. There are fewer imide foam companies. [0003] Due to the requirements of light weight and weight reduction, the demand for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08K5/523C08K5/526C08K5/521C08K5/524C08J9/12C08J9/14C08L79/08
CPCC08G73/1035C08J9/125C08J9/141C08J9/142C08J2203/182C08J2203/202C08J2379/08C08K5/521C08K5/523C08K5/524C08K5/526
Inventor 郑逸良曾辉
Owner CHANGZHOU TIANSHENG NEW MATERIALS CO LTD
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