Composite insulating varnish and preparation method thereof

A technology of composite insulation and insulating paint, applied in coatings, fire-retardant coatings, polyester coatings, etc., can solve the problems of difficult to greatly increase the thermal decomposition temperature, difficult to ensure product quality stability, difficult to reduce the preparation cost, etc. Achieve the effect of excellent easy processing characteristics, low cost and excellent electrical insulation performance

Active Publication Date: 2017-04-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are deficiencies in both the product and its preparation method. First, the inorganic nanopowder doped in the product is too small, with a particle size of only 10-200nm. In the imide resin, it is not only difficult to increase the initial thermal decomposition temperature of the product, but also difficult to ensure the stability of the product quality; secondly, the preparation method is not only time-consuming and labor-intensive, but also energy-consuming, which takes a long time It is difficult to use a high-speed disperser to disperse the inorganic nano-powder in the polyimide resin, and it takes a long time to grind the polyimide resin added with the inorganic nano-powder, which makes it extremely difficult to reduce the preparation cost

Method used

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  • Composite insulating varnish and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The concrete steps of preparation are:

[0032] Step 1, first, according to the volume ratio of tetraethyl orthosilicate to 0.2g / L silicate sheet aqueous solution is 0.6:1, tetraethyl orthosilicate is added dropwise into the silicate sheet aqueous solution to obtain a mixed liquid; wherein, the silicate flakes are sericite flakes. Then hydrochloric acid was added to the mixed solution to adjust its pH value to 1, and then hydrolyzed for 1 hour to obtain a precursor solution.

[0033] Step 2, the precursor solution is first dried and then ground to obtain an approximate figure 1 The silicate-silicon dioxide hybrid shown; wherein, the drying temperature of the precursor solution is 40° C. and the drying time is 6 hours. Then according to the weight ratio of the organic insulating varnish and the silicate-silicon dioxide hybrid is 90:10, add the silicate-silicon dioxide hybrid to the organic insulating varnish under stirring; wherein, the organic insulating varnish is F...

Embodiment 2

[0035] The concrete steps of preparation are:

[0036] Step 1. First, according to the volume ratio of tetraethyl orthosilicate to 0.2g / L silicate flake aqueous solution is 0.7:1, tetraethyl orthosilicate is added dropwise into the silicate flake aqueous solution to obtain mixed liquid; wherein, the silicate flakes are sericite flakes. Then hydrochloric acid was added to the mixed solution to adjust its pH value to 1.5, and then hydrolyzed for 2 hours to obtain a precursor solution.

[0037] Step 2, the precursor solution is first dried and then ground to obtain an approximate figure 1 The silicate-silicon dioxide hybrid shown; wherein, the drying temperature of the precursor solution is 45° C. and the drying time is 5.5 hours. According to the weight ratio of the organic insulating varnish and the silicate-silicon dioxide hybrid is 92:8, the silicate-silicon dioxide hybrid is added to the organic insulating varnish under stirring; wherein, the organic insulating varnish is ...

Embodiment 3

[0039] The concrete steps of preparation are:

[0040] Step 1. First, according to the volume ratio of tetraethyl orthosilicate to 0.2g / L silicate sheet aqueous solution is 0.8:1, tetraethyl orthosilicate is added dropwise into the silicate sheet aqueous solution to obtain a mixed liquid; wherein, the silicate flakes are sericite flakes. Then hydrochloric acid was added to the mixed solution to adjust its pH value to 2, and then hydrolyzed for 2.5 hours to obtain a precursor solution.

[0041] Step 2, the precursor solution is first dried and then ground to obtain the following figure 1 The silicate-silicon dioxide hybrid shown; wherein, the drying temperature of the precursor solution is 50° C. and the drying time is 5 hours. Then according to the weight ratio of the organic insulating varnish to the silicate-silicon dioxide hybrid is 95:5, add the silicate-silicon dioxide hybrid to the organic insulating varnish under stirring; wherein, the organic insulating varnish is F...

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Abstract

The invention discloses a composite insulating paint and a preparation method thereof. The insulating paint consists of an organic insulating paint and a silicate-silicon dioxide hybrid in a weight ratio of (90-99):(1-10), wherein the silicate-silicon dioxide hybrid is obtained by loading silicon dioxide particles on the surface of a silicate sheet, the length and the width of the silicate sheet are 1-20 microns, the thickness of the silicate sheet is less than or equal to 1 micron, the silicate sheet is one of or a mixture of two of sericite and kaolin, and the particle size of the silicon dioxide particles is 0.1-2 microns. The preparation method comprises the following steps: firstly, dropwise adding tetraethyl orthosilicate into an aqueous solution of the silicate sheet to obtain a mixed solution; secondly, adding hydrochloric acid into the mixed solution, and then performing hydrolysis to obtain a precursor solution; thirdly, drying the precursor solution, and then milling to obtain the silicate-silicon dioxide hybrid; and finally, adding the silicate-silicon dioxide hybrid into the organic insulating paint while stirring to prepare the target product. The composite insulating paint has relatively high initial decomposition temperature and thermal stability, and can be widely applied to insulating places needing high temperature resistance and fireproof performance.

Description

technical field [0001] The invention relates to an insulating varnish and a preparation method thereof, in particular to a composite insulating varnish and a preparation method thereof. Background technique [0002] Insulating varnish is an indispensable material in the modern electrical industry, and it can play a very good insulating and protective effect on electronic devices, conductor wires, etc. At present, the commonly used insulating varnish is mainly composed of organic polymer materials. Although it has excellent electrical insulation properties and processing characteristics, it is easy to decompose in some high-temperature applications, such as special motors working in high-temperature environments. , The defect of poor high temperature resistance. In order to solve this problem, various efforts have been made, such as a polyimide / inorganic nanocomposite insulating varnish disclosed on January 11, 2006 in the Chinese invention patent application publication CN ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D179/08C09D167/06C09D175/04C09D5/25C09D5/18C09D7/12
Inventor 包超谭肃张献丁欣胡坤郑康田兴友
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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