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Spherical silica/polyimides composite membrane, preparation thereof and applications

A silicon dioxide and polyimide technology, applied in insulators and other directions, can solve the problems of poor surface morphology consistency, difficult and uniform dispersion of inorganic particles, and decreased material properties and mechanical properties, and achieve low moisture absorption and excellent mechanical properties. , the effect of excellent corona resistance

Active Publication Date: 2008-10-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the addition of inorganic particles to polyimide can significantly improve the corona resistance of the film, the clustering effect of the inorganic particles often makes it difficult for the inorganic particles to disperse uniformly in the polymer matrix resin; Inorganic particles are particles with irregular shapes, and the consistency of particle shape and surface morphology is poor, which will generate internal stress at the interface between inorganic particles and matrix resin, resulting in the decline of certain properties of the material (such as mechanical properties, etc.)

Method used

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  • Spherical silica/polyimides composite membrane, preparation thereof and applications

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Experimental program
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Effect test

Embodiment 1

[0047] 1.4080g spherical silica (average particle size: 0.06μm, specific surface area: 55.9m 2 / g, bulk density: 0.09g / cm 3 ) and 0.0704g γ-aminopropyltriethoxysilane were mixed with 170g N, N'-dimethylacetamide, and dispersed for 40 minutes with an ultrasonic disperser. Under the protection of nitrogen, add 14.9488g 1,3-bis(4-aminophenoxy)benzene to the above dispersed system; after the solid is completely dissolved, add 0.4214g bis-(γ-aminopropyl) tetra Methylpolysiloxane; 15.0888g of 3,3',4,4'-biphenyltetraacid dianhydride was added in batches under mechanical stirring. The reaction temperature was controlled at <30° C., and the reaction was stirred for 6 hours to obtain a spherical silica particle / polyamic acid mixed resin solution.

[0048] The prepared spherical silica particles / polyamic acid mixed resin solution was uniformly coated on a clean glass plate. Then, keep at 40°C for 5 hours, 100°C for 1 hour, 150°C for 1 hour, 200°C for 1 hour, 250°C for 1 hour, and 300°...

Embodiment 2

[0050] 2.8160g spherical silica (average particle size: 0.06μm, specific surface area: 55.9m 2 / g, bulk density: 0.09g / cm 3 ) and 0.1408g gamma-aminopropyltriethoxysilane were mixed with 170g N, N'-dimethylacetamide, and dispersed for 40 minutes using an ultrasonic disperser. Under the protection of nitrogen, add 14.9488g 1,3-bis(4-aminophenoxy)benzene to the above dispersed system; after the solid is completely dissolved, add 0.4214g bis-(γ-aminopropyl) tetra Methylpolysiloxane; 15.0888g of 3,3',4,4'-biphenyltetraacid dianhydride was added in batches under mechanical stirring. The reaction temperature was controlled at <30° C., and the reaction was stirred for 6 hours to obtain a spherical silica particle / polyamic acid mixed resin solution.

[0051] The prepared spherical silica particles / polyamic acid mixed resin solution was uniformly coated on a clean glass plate. Then, keep at 40°C for 5 hours, 100°C for 1 hour, 150°C for 1 hour, 200°C for 1 hour, 250°C for 1 hour, and...

Embodiment 3

[0053] 4.2240g spherical silica (average particle size: 0.06μm, specific surface area: 55.9m 2 / g, bulk density: 0.09g / cm 3 ) and 0.2112g gamma-aminopropyltriethoxysilane were mixed with 170g N, N'-dimethylacetamide, and dispersed for 40 minutes using an ultrasonic disperser. Under the protection of nitrogen, add 14.9488g 1,3-bis(4-aminophenoxy)benzene to the above dispersed system; after the solid is completely dissolved, add 0.4214g bis-(γ-aminopropyl) tetra Methylpolysiloxane; 15.0888g of 3,3',4,4'-biphenyltetraacid dianhydride was added in batches under mechanical stirring. The reaction temperature was controlled at <30° C., and the reaction was stirred for 6 hours to obtain a spherical silica particle / polyamic acid mixed resin solution.

[0054] The prepared spherical silica particles / polyamic acid mixed resin solution was uniformly coated on a clean glass plate. Then, keep at 40°C for 5 hours, 100°C for 1 hour, 150°C for 1 hour, 200°C for 1 hour, 250°C for 1 hour, and...

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Abstract

The invention discloses a spherical silicon dioxide / polyimide composite film and a method for making the same as well as an application. The method for making the spherical silicon dioxide / polyimide composite film comprises the following steps that: 1) spherical silicon dioxide particles are scattered into an organic solvent evenly to obtain the spherical silicon dioxide particle suspension liquid; 2) a surface treatment agent, a molecular weight modifying agent, an auxiliary adhesive, a flatting agent and aromatic series diamine are dissolved inside the spherical silicon dioxide particle suspension liquid; organic dicarboxylic anhydride is added to be stirred in order to obtain a spherical silicon dioxide / polyamide acid mixing resin solution; 3) the mixing resin solution is coated on the surface of a flat substrate and is heated up to make the solvent volatilize and complete the imide reaction to obtain the spherical silicon dioxide / polyimide composite film. The spherical silicon dioxide / polyimide composite film has good mechanical property, good corona resistance, low thermal coefficient of expansion and low moisture absorption ratio, and has important application value in an insulating system of a frequency conversion speed motor.

Description

technical field [0001] The invention relates to a polyimide composite film doped with spherical silica particles and its preparation method and application. The polyimide composite film has excellent mechanical properties, excellent corona resistance and low thermal expansion coefficient and low moisture absorption rate, it has important application value in the insulation system of variable frequency speed regulating motor. Background technique [0002] In recent years, the rapid development of frequency conversion speed regulation technology of AC motors has attracted great attention. Compared with the commonly used AC motor at present, the variable frequency speed regulating motor can save energy by 30-40%. Its remarkable energy saving effect makes it one of the high-tech that has been promoted and applied in recent years. However, one of the key problems in the development of frequency conversion speed regulation technology is the premature damage of the motor insulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L79/08C08K5/5415H01B17/62C08K3/36C08K5/17C08K5/09
Inventor 杨士勇芮嘉明范琳
Owner INST OF CHEM CHINESE ACAD OF SCI
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