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Transparent antifogging agent and preparation method thereof

An anti-fogging agent and transparent technology, applied in chemical instruments and methods, other chemical processes, coatings, etc., can solve the problems of unsuitable for large-scale and long-term applications, volatile surfactants, short anti-fog timeliness, etc. problem, to achieve the effect of enhancing the ability to resist water vapor erosion, avoiding agglomeration, and overcoming insufficient wear resistance

Active Publication Date: 2018-01-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anti-fog agents that achieve anti-fog effects by adding surfactants, because the surfactants are volatile during use, resulting in short anti-fog timeliness, and are not suitable for large-scale and long-term applications
[0008] The patent disclosure specification of CN1259386C discloses a polyvinyl alcohol (PVA) as the main raw material, through the technical process of acetaldehyde, potassium dichromate and other substances to modify the polyvinyl alcohol and add loads to obtain the anti-fog function. Solvent, although it can be used for anti-fog, its preparation process contains harmful substances to the human body, and the process is relatively complicated

Method used

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  • Transparent antifogging agent and preparation method thereof
  • Transparent antifogging agent and preparation method thereof
  • Transparent antifogging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 2 g of polyvinyl alcohol (PVA) was dissolved in 98 g of hot water, heated and stirred until completely dissolved, and then cooled to room temperature to obtain a 2% polyvinyl alcohol aqueous solution A. Mix 300g of absolute ethanol, 5g of ammonia, and 20g of water and stir for 30 minutes, then add 6g of ethyl orthosilicate, keep at 60°C, and stir for 20 hours. Then 1 g of triaminopropyltriethoxysilane was added to obtain organosilane-modified SiO 2 Sol B. The A and B solutions were left to stand for 7 days, and 2 g of the B solution was slowly added to 10 g of the A solution under stirring conditions to obtain a transparent antifogging agent C solution. After cleaning the glass, apply C solution, dry at 80°C for 5 minutes, put the glass on a beaker filled with 80°C hot water, observe that the glass has a good anti-fog effect, and its anti-fog effect lasts for half a year , rinsing with water and wiping with a rag has no effect on this.

Embodiment 2

[0033] Dissolve 3 g of polyvinyl alcohol (PVA) in 97 g of hot water, heat and stir until completely dissolved, and then cool to room temperature to obtain a 3% polyvinyl alcohol aqueous solution A. Mix 300g of absolute ethanol, 5g of ammonia, and 20g of water and stir for 30 minutes, then add 8g of ethyl orthosilicate, keep at 60°C, and stir for 20 hours. Then 1 g of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane was added to obtain organosilane-modified SiO 2Sol B. The A and B solutions were left to stand for 7 days, and 2 g of the B solution was slowly added to 10 g of the A solution under stirring conditions to obtain a transparent antifogging agent C solution. After cleaning the glass, apply C solution, dry at 80°C for 5 minutes, put the glass on a beaker filled with 80°C hot water, observe that the glass has a good anti-fog effect, and its anti-fog effect lasts for half a year , rinsing with water and wiping with a rag has no effect on this.

Embodiment 3

[0035] 4g of polyvinyl alcohol (PVA) was dissolved in 96g of hot water, heated and stirred until completely dissolved, and then cooled to room temperature to obtain a 4% polyvinyl alcohol aqueous solution A. Mix 300g of absolute ethanol, 5g of ammonia water, and 20g of water and stir for 30min, then add 7g of ethyl orthosilicate, keep at 60°C, and stir for 20h. Then 1 g of 3-(trihydroxysilyl)-propanesulfonic acid was added to obtain organosilane-modified SiO 2 Sol B. The A and B solutions were left to stand for 7 days, and 2 g of the B solution was slowly added to 10 g of the A solution under stirring conditions to obtain a transparent antifogging agent C solution. After cleaning the glass, apply C solution, dry at 80°C for 5 minutes, put the glass on a beaker filled with 80°C hot water, observe that the glass has a good anti-fog effect, and its anti-fog effect lasts for half a year , rinsing with water and wiping with a rag has no effect on this.

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Abstract

The invention discloses a transparent antifogging agent. The transparent antifogging agent is composed of an organosilane-modified SiO2 sol and an aqueous polyvinyl alcohol solution, wherein a mass ratio of the organosilane-modified SiO2 sol to the aqueous polyvinyl alcohol solution is 1: 10-1, and the organosilane-modified SiO2 sol is prepared from ethyl orthosilicate and absolute ethyl alcohol under the action of an alkali catalyst, i.e., ammonia water. The invention also discloses a preparation method for the transparent antifogging agent. The transparent antifogging agent is low in cost; the preparation method is simple in steps; and an antifogging film has improved water vapor resistance, enhanced antifogging endurance and substantially improved mechanical strength.

Description

technical field [0001] The invention relates to the field of preparation of an antifogging agent, in particular to a transparent antifogging agent and a preparation method thereof. Background technique [0002] Transparent materials (such as glass and plastic) are widely used in industrial and agricultural production, daily life and military fields, such as telescopes, goggles, lenses of various camera equipment, bathroom glass and mirrors, car windshields and rearview mirrors , photovoltaic cover and so on. In these applications, the problems caused by surface fogging bring a lot of inconvenience to people's production and life, and cause losses. Therefore, the research and development of anti-fog technology, especially transparent anti-fog technology, has attracted much attention in the above fields and other fields with visual requirements. [0003] In the published literature and patent reports, the existing antifogging agents are mainly divided into two categories: hy...

Claims

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Application Information

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IPC IPC(8): C09K3/18C09D129/04C09D7/62
Inventor 宋伟杰李啸张贤鹏鲁越晖艾玲张景
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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