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Preparation method of polyamideimide fine powder

A technology of polyamideimide and polyamic acid amic acid is applied in the field of preparation of polyamideimide fine powder, and can solve the problems of preparing polyamideimide fine powder, unable to adopt solution precipitation method, etc.

Inactive Publication Date: 2015-12-02
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that the solution precipitation method cannot be used to prepare polyamide-imide fine powder in the prior art, and a new preparation method of polyamide-imide fine powder is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Under the protection of nitrogen, the N-methylpyrrolidone solution of 20L of polyamic acid with an apparent viscosity of 500mPas was pressurized to 1MPa through a booster pump, and the compressed nitrogen of 1MPa was mixed with the pressurized polyamic acid solution at the same time. Spray from the spout. The atomized droplets enter the spray precipitation tower equipped with 50L of vigorously stirred methanol solution, and the stirring rate is controlled at 600rpm. After the spraying was completed, the above mixture was added into the washing and filtering tower for washing and filtering twice, and the residual amount of NMP solvent was 3.9 wt%. The obtained polyamide-amic acid powder was vacuum-dried at 80° C. for 12 hours, and thermally imidized at 200° C. for 4 hours to obtain a polyamide-imide fine powder with a D50 particle size of 32.6 μm.

Embodiment 2

[0021] Under the protection of nitrogen, 20L of N,N-dimethylacetamide solution of polyamic acid with an apparent viscosity of 2000mPas is pressurized to 5MPa through a booster pump, and at the same time, the compressed air of 5MPa is mixed with the pressurized polyamideamide The acid solution is mixed and sprayed from the spout. The atomized droplets enter the spray precipitation tower equipped with 100L of vigorously stirred ethanol solution, and the stirring rate is controlled at 600rpm. After the spraying is completed, the above mixture is added into the washing and filtering tower for washing and filtering twice, and the residual amount of DMAc solvent is 3.1 wt%. The obtained polyamide-amic acid powder was vacuum-dried at 120° C. for 8 hours, and heat-treated at 230° C. for 3 hours to obtain a polyamide-imide fine powder with a D50 particle size of 28.2 μm.

Embodiment 3

[0023] Under the protection of nitrogen, pressurize 20L of DMAc solution of polyamic acid with an apparent viscosity of 10000mPas to 0.5MPa through a booster pump, and at the same time mix 0.5MPa compressed air with the pressurized polyamic acid solution and send it from the nozzle squirt. The atomized droplets enter the spray precipitation tower equipped with 100L of vigorously stirred ethanol solution, and the stirring rate is controlled at 600rpm. After the spraying was completed, the above mixture was added into the washing and filtering tower for washing and filtering twice, and the residual amount of DMAc solvent was 9.2wt%. The obtained polyamide-amic acid powder was vacuum-dried at 150° C. for 8 hours, and heat-treated at 230° C. for 3 hours to obtain a polyamide-imide fine powder with a D50 particle size of 487 μm.

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PUM

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Abstract

The invention relates to a preparation method of polyamideimide fine powder, which mainly solves the problem that the solution precipitation process can not be used for preparing polyamideimide fine powder in the prior art. The technical scheme is as follows: the preparation method comprises the following steps: adding a polyamide amide acid or polyamideimide polymer solution prepared by solution polycondensation into a high pressure atomizer or centrifugal atomizer to atomize the polymer solution into micron-sized atomized liquid drops, adding the atomized liquid drops into a precipitant to precipitate and form superfine polyamide amide acid or polyamideimide powder, washing, filtering and drying to obtain the final product. The technical scheme well solves the problem above, and can be used for preparing polyamideimide fine powder.

Description

technical field [0001] The invention relates to a preparation method of polyamideimide fine powder. Background technique [0002] The polyamide-imide molecular structure contains flexible amide bonds and rigid imine groups. Therefore, it not only has the properties of high temperature resistance, high modulus, high strength, solvent resistance, low creep and self-lubrication of typical polyimide; it also has excellent molding processing capabilities, such as molding, extrusion and injection molding. Molding of polyamideimide. It is worth pointing out that polyamide-imide has excellent performance retention at high temperatures, and can be used as one of the candidate materials to replace metals. It is widely used in high-temperature load-bearing and pressure-bearing structural parts, wear-resistant and lubricating parts, such as gears and bearings. , gaskets, adapters and casings, etc. [0003] The synthesis method of polyamide-imide under the prior art is mainly solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08J3/12C08L79/08C08G73/14
Inventor 卞卿卿叶良苏余敏强揭元萍张春雷
Owner SHANGHAI HUAYI GRP CO
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