CN111826001A

CN111826001A - Ultrahigh-insulation inorganic coating and preparation method thereof

Info

Publication number: CN111826001A
Application number: CN201910244442.3A
Authority: CN
Inventors: 王晓亮
Original assignee: Huancheng Shanghai New Materials Technology Development Co ltd
Current assignee: Huancheng Shanghai New Materials Technology Development Co ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-10-27

Abstract

The invention discloses an ultrahigh-insulation inorganic coating, a preparation method and a coating method thereof, wherein the ultrahigh-insulation inorganic coating comprises silica sol, mica powder and a functional auxiliary agent, the weight of the silica sol is 2.5-50% of the weight of a main coating, and the weight of the mica powder is 5-80% of the weight of the silica sol. The ultrahigh-insulation inorganic coating disclosed by the invention takes silica sol as a binder, does not need organic resin, and can still keep the resistivity above 10^10 ohm x cm under a high-temperature condition and a high ultraviolet aging environment, so that the coating has excellent high-temperature resistance and high weather resistance.

Description

Ultrahigh-insulation inorganic coating and preparation method thereof

Technical Field

The invention relates to the technical field of coating preparation, in particular to an ultrahigh-insulation inorganic coating and a preparation method thereof.

Background

In the field of electronic and electrical appliances, a coating needs to be coated on the surface of an electronic component to ensure the insulation property of the electronic component, and in the preparation of the existing coating, a common technical means is to select high-insulation organic polymer resin (such as polyimide) as a connecting material. The high polymer resin cannot have the characteristics of high temperature resistance (more than 500 ℃) and high weather resistance. Under truly harsh conditions, these insulating coatings will fail.

Disclosure of Invention

The invention aims to solve the technical problem of providing an ultrahigh-insulation inorganic coating, which can solve the problems that the coating adopting high-molecular resin as a connecting agent in the prior art does not have high temperature resistance and high weather resistance, and therefore, the invention also provides a preparation method of the ultrahigh-insulation inorganic coating.

In order to solve the problems, the invention adopts the following technical scheme:

the invention provides an ultrahigh-insulation inorganic coating, which comprises 2.5-50% by weight of silica sol, 5-80% by weight of mica powder and a functional auxiliary agent.

Preferably, the silica sol is a silica sol.

Preferably, the functional assistant comprises a dispersant, a thickener and a leveling agent.

As a preferable technical scheme, the diameter-thickness ratio of the mica powder is 50, and the particle size is 400 meshes.

In a second aspect of the present invention, a method for preparing an ultra-high insulation inorganic coating is provided, which is used for preparing the ultra-high insulation inorganic coating, and comprises the following steps:

step one, adding silica sol and functional auxiliary agent into a stirrer at normal temperature;

step two, opening stirring, and gradually adding the mica powder into the stirrer;

and step three, continuously stirring for 30 minutes.

As a preferred technical scheme, the third step further comprises the step of grinding the mixed solution in a three-roll grinder.

In a third aspect of the present invention, there is provided a coating method of an ultra-high insulation inorganic paint, using the ultra-high insulation inorganic paint, comprising the steps of: and coating the inorganic coating on the surface of the substrate, and curing at normal temperature for 24 hours, or at 200 ℃ for 2 hours, or at 500 ℃ for 5 minutes, or at 650 ℃ for 2 minutes.

The ultrahigh-insulation inorganic coating disclosed by the invention takes silica sol as a binder, does not need organic resin, and can still keep the resistivity above 10^10 ohm x cm under a high-temperature condition and a high ultraviolet aging environment, so that the coating has excellent high-temperature resistance and high weather resistance.

Drawings

FIG. 1 is a graph showing a comparison of the volume resistance of the insulating layer obtained in example 1 of the present invention and the insulating layer of polyamide.

Detailed Description

Example 1

Taking 100g of silica sol with 20 percent of solid content, diluting the silica sol to 800ml with water, and preparing aqueous dispersion with the solid content of the silica being 2.5 percent; under the condition of rapid stirring, 10g of phlogopite powder (the diameter-thickness ratio is 50, the particle size is 400 meshes) is added into the mixture, the obtained liquid is brushed on the surface of a copper plate, the mixture is cured at room temperature for 24 hours, and the electric insulation property is tested. And then, after the glass is treated in a muffle furnace at 650 ℃ for 5 minutes, the glass is naturally cooled, and the electrical insulation property is tested.

Example 2

100g of silica sol with the solid content of 60 percent is taken, 40g of phlogopite powder (the diameter-thickness ratio is 50, the particle size is 800 meshes) is added under the condition of rapid stirring, and the obtained viscous liquid is transferred into a three-roller grinding machine and ground until the fineness is 20 microns. Thus preparing the high-viscosity inorganic insulating paint suitable for silk screen printing. The paint was screen printed onto a copper plate and treated in a muffle furnace at 650 degrees celsius for 10 minutes. The bulk resistance was tested to be above 10 ohms-cm to the power of 10.

Example 3

100g of silica sol with the solid content of 40 percent is taken, 2g of phlogopite powder (the diameter-thickness ratio is 50, the particle size is 200 meshes) is added under the condition of rapid stirring, the obtained coating is brushed on a copper plate, and the mixture is treated in a muffle furnace at 650 ℃ for 10 minutes. The bulk resistance was tested to be above 10 ohms-cm to the power of 10.

The insulation layer obtained in example 1 was compared with a polyamide insulation layer, and the test results are shown in fig. 1.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. The ultrahigh-insulation inorganic coating is characterized by comprising the following components: the coating comprises silica sol, mica powder and a functional auxiliary agent, wherein the weight of the silica sol is 2.5-50% of the weight of the main coating, and the weight of the mica powder is 5-80% of the weight of the silica sol.

2. The ultra-high insulation inorganic paint according to claim 1, wherein the silica sol is silica sol.

3. The ultra-high insulation inorganic paint according to claim 1, wherein the functional additives comprise a dispersant, a thickener and a leveling agent.

4. The ultra-high insulation inorganic paint as claimed in claim 1, wherein the mica powder has a diameter-thickness ratio of 50 and a particle size of 400 mesh.

5. A method for preparing an ultra-high insulation inorganic paint for preparing the ultra-high insulation inorganic paint according to any one of claims 1 to 4, comprising the steps of:

and step three, continuously stirring for 30 minutes.

6. The method for preparing an ultra-high insulation inorganic coating material according to claim 5, further comprising a step of grinding the mixed solution in a three-roll grinder after the step three.

7. A coating method of an ultra-high insulation inorganic coating material, which adopts the ultra-high insulation inorganic coating material of any one of claims 1 to 4, is characterized by comprising the following steps: and coating the inorganic coating on the surface of the substrate, and curing at normal temperature for 24 hours, or at 200 ℃ for 2 hours, or at 500 ℃ for 5 minutes, or at 650 ℃ for 2 minutes.