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Method for preparing hydrophilic nano silica for silicone sealant

A nano-silica, silicone sealant technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of limited hydrophilicity, reduced hydrophilicity, affecting curing, etc. The effect of enhancing adhesion, expanding application range, and shortening curing time

Inactive Publication Date: 2016-11-09
安徽敬业纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-silica has many unique properties due to its ultra-fine nano-scale, which can greatly improve the strength, anti-aging, chemical resistance and weather resistance of the material, but its hydrophilicity is limited, especially when compared with other silicone sealants. After the raw materials are mixed, the hydrophilicity is greatly reduced, which affects the solidification with water, so it is necessary to chemically modify the structure of nano-silica to improve its hydrophilicity

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] (1) Add concentrated hydrochloric acid dropwise to water glass solution (formed by adding water to 10g water glass) with a mass concentration of 40% under stirring, control the pH value of the solution at 5-6, and then microwave at a microwave frequency of 2450MHz and a power of 700W 10min, then cool naturally to 50-60°C, keep warm for 3h, then continue microwave treatment for 5min, the resulting mixed solution is left to stand at 0-5°C for 8h, filtered, the filter residue is washed three times, and finally dried at 100-110°C for 5h to obtain Intermediate I;

[0014] (2) Grind the intermediate I into powder, then add 1.5g of hydrolyzed polymaleic anhydride and 0.2g of tetrabutylammonium chloride, add 30g of isopropanol to the mixed powder after grinding for 1h, fully mix and let stand for 30min, Then microwave treatment at a microwave frequency of 2450MHz and a power of 700W for 10 minutes to obtain intermediate II;

[0015] (3) Add 0.5g of polyethylene glycol 400 and ...

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PUM

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Abstract

The invention discloses a method for preparing hydrophilic nano silica for a silicone sealant and relates to the technical field of nanometer materials. Water glass and concentrated hydrochloric acid are taken as raw materials to manufacture nano silica; and hydrolytic polymaleic anhydride, tetrabutylammonium chloride, polyethylene glycol 400 and polyoxyethylene lauryl ether are utilized to chemically modify the hydrophilic nano silica, to obtain the hydrophilic nano silica. The granularity of the hydrophilic nano silica reaches 20-30 nm. The prepared hydrophilic nano silica is applied to the silicone sealant, not only can shorten curing time of the silicone sealant and water, but also enhances caking property, weather resistance, vibration resistance and high-low temperature resistance, and effectively expands the use range of the sealant.

Description

Technical field: [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing hydrophilic nano silicon dioxide for silicone sealants. Background technique: [0002] Silicone sealant is a paste made of polydimethylsiloxane as the main raw material, supplemented with crosslinking agent, filler, plasticizer, coupling agent, and catalyst in a vacuum state. Cures with water in the air to form elastic silicone rubber. Nano-silica has many unique properties due to its ultra-fine nano-scale, which can greatly improve the strength, anti-aging, chemical resistance and weather resistance of the material, but its hydrophilicity is limited, especially when compared with other silicone sealants. The hydrophilicity of raw materials is greatly reduced after mixing, which affects the solidification with water. Therefore, it is necessary to chemically modify the structure of nano-silica to improve its hydrophilicity. Invention content: [0...

Claims

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Application Information

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IPC IPC(8): C09J11/04C09J183/04
CPCC09J11/04C08K3/36C08K9/04C08K9/08C08K2201/011C09J183/04
Inventor 陈敬陈太林伏传久
Owner 安徽敬业纳米科技有限公司
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