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Preparation method of silicon dioxide antireflection film

A technology of silicon dioxide and anti-reflection coating, which is applied in the direction of coating, etc., can solve the problems of being unsuitable for industrial mass production, high heat treatment temperature, and cumbersome production process, etc. small effect

Active Publication Date: 2018-04-20
湖南兴威新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, acid catalysis is the silica sol prepared under acidic conditions. The prepared silica anti-reflection film is relatively dense and has good friction resistance, but the anti-reflection effect is not good; while alkali catalysis is alkaline conditions. The silica sol prepared below has larger pores and better anti-reflection effect, but the friction resistance is relatively low.
[0004] In view of the above defects, some improvements have been made in the prior art, such as preparing multi-layer silica superimposed films, or adding organic polymers such as polyethylene glycol to silica sol, but most of these methods have poor controllability. , the production process is cumbersome, and the silicon dioxide anti-reflective coating has defects such as high heat treatment temperature in the later stage, which is not suitable for industrial mass production

Method used

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  • Preparation method of silicon dioxide antireflection film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment provides a kind of preparation method of silicon dioxide anti-reflection film, it comprises the following steps:

[0031] Step 1, using a silicon compound, a solvent, an inhibitor, deionized water and an acid catalyst as raw materials to prepare a clear sol by a sol-gel method under acidic conditions;

[0032] Step 2. Stir and add ammonia water and ethyl acetate to the clear sol obtained in step 1, and react for 0.5-24 hours under the condition of constant temperature reflux at a temperature of 40-100°C to obtain a milky white silica sol; among them, the silicon compound The mass percentage content of the solvent is 2-10%, the mass percentage content of the solvent is 60-90%, and the mass percentage content of water is 1-40%;

[0033] Step 3, using the milky white silica sol obtained in step 2 to coat the surface-treated substrate to form a film;

[0034] Step 4: Heat-treat the film obtained in Step 3 to obtain a silicon dioxide anti-reflection f...

Embodiment approach

[0051] Step 1. Weigh 5g of tetraethyl orthosilicate and mix with 50ml of ethanol, stir at room temperature for 2 hours, then slowly drop in 5ml of glacial acetic acid with a dropping funnel, stir while dripping, continue stirring for 1 hour after dropping, record It is liquid A; mix 5g of deionized water, 1ml of concentrated hydrochloric acid and 25ml of ethanol, stir at room temperature for 1 hour, and record it as liquid B; use a dropping funnel to slowly drop all liquid B into the vigorously stirred liquid A After dripping, continue to stir for 3.5 hours, and the obtained sol is recorded as liquid C, and aged at room temperature for 24-48 hours, and finally a clear sol is obtained;

[0052] Step 2. Pour the clarified sol into a three-necked flask, mix in 0.5ml of ammonia water and 5ml of ethyl acetate under stirring, and react for 2 hours under constant temperature reflux at 80°C to obtain a milky white silica sol;

[0053] Step 3. After aging the milky white silica sol obt...

Embodiment 3

[0057] On the basis of embodiment 1, this embodiment further provides a specific implementation mode:

[0058] Step 1. Weigh 8g of tetraethyl orthosilicate and mix with 60ml of ethanol, stir at room temperature for 2 hours, then slowly drop in 2ml of glacial acetic acid with a dropping funnel, stir while dripping, continue stirring for 1 hour after dropping, record It is liquid A; mix 20g of deionized water, 2ml of concentrated hydrochloric acid and 30ml of ethanol, stir at room temperature for 1 hour, and record it as liquid B; use a dropping funnel to slowly drop all liquid B into the vigorously stirred liquid A After dripping, continue to stir for 3.5 hours, and the obtained sol is recorded as liquid C, and aged at room temperature for 24-48 hours, and finally a clear sol is obtained;

[0059] Step 2. Pour the clarified sol into a three-necked flask, mix in 0.5ml of ammonia water and 5ml of ethyl acetate under stirring, and react for 2 hours under constant temperature reflu...

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Abstract

The invention discloses a preparation method of a silicon dioxide antireflection film. The preparation method comprises the following steps of preparing a clear sol by using raw materials like a silicon compound, a solvent, a suppressor, deionized water and acid catalyst under an acidic condition through a sol-gel method; stirring and adding aqueous ammonia and ethyl acetate into the clear sol, and reacting for 0.5-24 hours in a 40-100DEG C constant temperature backflow condition, so as to prepare milky white silicon dioxide sol, wherein the milky white silicon dioxide sol contains 2-10 mass percent of silicon compound, 60-90 mass percent of solvent and 1-40 mass percent of water; and applying the milky white silicon dioxide sol onto a substrate with the surface treated, so as to obtain acoating. The silicon dioxide antireflection coating prepared by the method has higher air porosity and lower refractive index, and has much better antireflection effect while maintaining the frictionresistance. The preparation method is low in production cost, slightly affects surrounding environment, and is suitable for large-scale production and application of industry.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide anti-reflection film materials, in particular to a preparation method of a friction-resistant silicon dioxide anti-reflection film. Background technique [0002] At present, anti-reflection coatings, as an important field of functional coatings, have been widely used in various modern industries. For example, anti-reflection coatings are playing an increasingly important role in various optical lenses, glass screens of optoelectronic products, lasers and solar cells in daily life. [0003] In the prior art, it is a relatively common method to prepare an anti-reflection coating with silicon dioxide, and the process mostly adopts a sol-gel method, which is mainly divided into an acid-catalyzed method and an alkali-catalyzed method. Under normal circumstances, acid catalysis is the silica sol prepared under acidic conditions. The prepared silica anti-reflection film is relatively dense and h...

Claims

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Application Information

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IPC IPC(8): C03C17/25
CPCC03C17/25C03C2217/213C03C2217/78C03C2218/11C03C2218/116C03C2218/32
Inventor 王云周剑飞李宏建夏辉
Owner 湖南兴威新材料有限公司