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Preparation method for polyamide imide foam

A polyamide-imide and foam technology, applied in the field of polymer synthesis, can solve the problems of high performance and high price of polyimide foam, low performance and low price of polymer foam, etc., achieve high cost performance, reduce overall cost, and promote The effect of promotion and application

Inactive Publication Date: 2019-01-11
溧阳华晶合成材料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low performance and low price of traditional polymer foam and high performance and high price of polyimide foam, the present invention provides a preparation method of polyamideimide foam, which is a brand-new, cost-effective green Environmentally friendly preparation method

Method used

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  • Preparation method for polyamide imide foam

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preparation example Construction

[0026] The preparation method of the polyamide-imide foam of the present embodiment may further comprise the steps:

[0027] 1) According to parts by weight, take 168-250 parts of diisocyanate, 125-192 parts of trimellitic anhydride, 0-113 parts of aromatic dianhydride, and 1-3 parts of catalyst;

[0028] 2) First add diisocyanate and trimellitic anhydride (and aromatic dianhydride) into the reaction kettle, after heating to 135-175°C, carry out constant temperature stirring and dispersion at a stirring speed of 200-800r / min, then add catalyst and continue constant temperature Stir and react to obtain the prepolymer, then pour out the cooled prepolymer and use a pulverizer to pulverize the cooled prepolymer to obtain the foam precursor powder;

[0029] 3) Spread the obtained foam precursor powder in a mould, after high-temperature foaming and imidization, let stand to cool down to room temperature naturally, and demould to obtain a polyamide-imide foam material.

[0030] Pref...

Embodiment 1

[0032] According to parts by weight, successively get 250 parts of diphenylmethane diisocyanate, 192 parts of trimellitic anhydride, 3 parts of 1,3,5-tris(dimethylaminopropyl)-1,3,5-hexahydrotriazine; Add diphenylmethane diisocyanate and trimellitic anhydride into the reaction kettle, and stir at a constant temperature for 3-5 minutes at a temperature of 135-175°C and a rotational speed of 200-800r / min. After the trimellitic anhydride is uniformly dispersed, then add the catalyst into the reaction kettle. Then, at a temperature of 135-175°C and a rotation speed of 200-800r / min, after stirring at a constant temperature for 30-60 minutes, pour out the resin in the kettle while it is hot, cool it to room temperature naturally, and then use a pulverizer to pulverize the cooled solid resin into Foam precursor, sieved with 60 mesh for future use. Spread the obtained foam precursor in the mold, place the mold in an oven at 190-260°C, foam and age at a constant temperature for 60-120 ...

Embodiment 2

[0034] According to parts by weight, successively get 174 parts of toluene diisocyanate, 192 parts of trimellitic anhydride, 2 parts of 1,3,5-tris(dimethylaminopropyl)-1,3,5-hexahydrotriazine; Add diisocyanate and trimellitic anhydride into the reaction kettle, and stir at a constant temperature for 3-5min at a temperature of 135-175°C and a rotation speed of 200-800r / min. -175°C, rotation speed 200-800r / min, after stirring at constant temperature for 30-60min, pour out the resin in the kettle while it is hot, cool it down to room temperature naturally, and then crush the cooled solid resin into a foam precursor with a pulverizer. 60 mesh sieve for later use. Spread the obtained foam precursor in the mold, place the mold in an oven at 190-260°C, foam and age at a constant temperature for 60-120 minutes, then remove the mold from the oven, let it stand and cool down to room temperature naturally, and demould to obtain polyamide imide foam.

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Abstract

The invention discloses a preparation method for polyamide imide foam and belongs to the field of polymer synthesis methods. The preparation method comprises the following steps: adding diisocyanate,trimellitic anhydride, aromatic dianhydride and catalyst into a reaction kettle, heating the reaction kettle and then reacting while stirring at a constant temperature, thereby acquiring a prepolymer;pouring out the prepolymer, cooling down and utilizing a grinder to grind the cooled prepolymer into a foam precursor; spreading the foam precursor in a mould; foaming at high temperature to performclosed-loop curing, standing and naturally cooling to room temperature, and then de-molding, thereby acquiring the polyamide imide foam material. The polyamide imide foam material prepared according to the invention has the characteristics of high / low temperature resistance of polyimide, fire resistance and high strength of polyamide, and is low in cost. The foaming technology for generating CO2 from self-reaction without dissolvent reaction is capable of boosting the popularization and application of the polyamide imide foam in more fields.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis methods, and relates to a solvent-free two-step method for preparing polyamide-imide foam. Background technique [0002] Due to its low density and light weight, polymer foam is often used in thermal insulation, insulation, sound insulation, shock absorption and other fields. Commonly used polymer foams are the first and second generation polymer foams made of polyolefin, polyurethane and phenolic formaldehyde, but the strength, temperature resistance, physical and chemical stability, and flame resistance of these materials cannot meet some requirements. special field requirements. [0003] Typical polyimides are polymers containing aromatic rings and aromatic heterocyclic structures, which have the best performance in terms of strength, high temperature / low temperature resistance, insulation, chemical stability, radiation resistance, self-flammability, heat insulation, and noise reduct...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J9/02
CPCC08G73/10C08G73/1003C08J9/02C08J2379/08
Inventor 钱时昌钱炜葛俊华
Owner 溧阳华晶合成材料有限公司
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