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Polyimide/inorganic nano-composite insulating varnish and its preparation method

An inorganic nano-composite insulation technology, applied in the direction of coating, etc., can solve the problems of long-term heat resistance not higher than 250 ℃, rising operating temperature, and unsatisfactory heat resistance

Inactive Publication Date: 2007-11-21
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The polyimide insulating paint currently on the market is baked and cured to form a film, and its long-term heat resistance is generally not higher than 250°C. For some special application fields, its heat resistance still cannot meet the requirements of some high-tech products; Most of its thermal conductivity is relatively low, generally between 0.20 and 0.25W / (m K), which is not conducive to the heat dissipation of motor electrical windings and microelectronic components, resulting in a further increase in operating temperature and a decrease in reliability

Method used

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  • Polyimide/inorganic nano-composite insulating varnish and its preparation method
  • Polyimide/inorganic nano-composite insulating varnish and its preparation method
  • Polyimide/inorganic nano-composite insulating varnish and its preparation method

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Embodiment 1

[0020] In a 100L reactor, weigh 85Kg of solvent, the composition of the solvent is dimethylacetamide:toluene=60:40 (weight ratio), start stirring, add 15.00mol of 4,4'-diaminodiphenyl ether, room temperature Stir until completely dissolved. Turn on the cooling water of the reaction kettle, and slowly add 15.30 mol of pyromellitic dianhydride in batches, so that the temperature of the material does not exceed 45°C; after adding the dibasic anhydride, stir at room temperature for 3 to 5 hours; the viscosity of the material reaches the maximum Afterwards, rise to 50~85 ℃ and degrade until the material viscosity drops to 2.0~4.0 minutes (23±2 ℃, No. 4 cup method); at room temperature, add in the polyamic acid resin described in claim 1 The inorganic non-metallic nanopowder according to claim 1 with an average particle diameter of 10nm to 200nm is dispersed for 2 to 48 hours under high shear stress by a high-speed disperser, and then ground for 24 to 96 hours to obtain polyimide / in...

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Abstract

An insulating polyimide / inorganic nano-material paint is proportionally prepared from polyimide resin, inorganic nano-particles and solvent through adding binary amine to solvent, adding binary acid anhydride step by step, stirring, heating until the viscosity is lowered to 2.0-4.0, dispersing the inorganic non-metal nanoparticles in said polyamide resin, and grinding. Its durable high-temp resistance is more than 300 deg.C and its heat conductivity is 0.4-0.7 W / (m.K).

Description

technical field [0001] The invention relates to a polyimide / inorganic nano composite insulating varnish and a preparation method thereof. Background technique [0002] The polyimide insulating paint currently on the market is baked and cured to form a film, and its long-term heat resistance is generally not higher than 250°C. For some special application fields, its heat resistance still cannot meet the requirements of some high-tech products; Most of its thermal conductivity is relatively low, generally between 0.20 and 0.25W / (m·K), which is not conducive to the heat dissipation of motor electrical windings and microelectronic components, resulting in a further increase in operating temperature and a decrease in reliability. Contents of the invention [0003] The object of the present invention is to provide a polyimide / inorganic nanocomposite insulating varnish with ultra-high temperature resistance and high thermal conductivity and its preparation method. More than twi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/08C09D5/25
Inventor 饶保林史博
Owner GUILIN UNIVERSITY OF TECHNOLOGY