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Organic silicon fluoro water proofing agent and its preparation method

A water repellent, silicone technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as high price and large-scale application gap, and achieve the effect of reducing water absorption ratio, improving solvent resistance, and improving elasticity

Active Publication Date: 2008-06-25
GUANGZHOU BAIYUN CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of fluorine-containing silane coupling agents, the current research on them is mostly on the theoretical level, and there is still a certain gap from the large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 100 parts of methyltriethoxysilane, 88 parts of hydroxy fluorosilicone oil with 5% hydroxyl value, and 120 parts of ethanol in the reaction flask at room temperature, and add 1 part of 10 under stirring. -5 Dilute hydrochloric acid of mol / L is a catalyst and 12 parts of water, heated to 80°C for 3 hours. After the reaction is complete, add 1 part of 10 -5 mol / L of Me 3 SiNHSiMe 3 Adjust the pH value of the reaction system to neutral with the ethanol solution; distill off the solvent and the ethanol and unreacted water produced by the reaction at 90°C. Raise the temperature to 110°C, continue the reaction for 0.5 hours, cool to room temperature, add 140 parts of ethanol to dissolve, and filter to obtain 280 parts of a silicone fluorine resin prepolymer solution with a concentration of 50%, which is the silicone fluorine waterproofing agent. Its γ(R / Si) is 1.5. According to JC / T 902-2002, the measured water absorption ratio is: 8.9% and the contact angle is 134°; while th...

Embodiment 2

[0021] Put 100 parts of methyltriethoxysilane, 22 parts of hydroxy fluorosilicone oil with 6% hydroxyl value, and 80 parts of ethanol in the reaction flask at room temperature, and add 1 part of 10 under stirring. -5 Dilute hydrochloric acid of mol / L is a catalyst and 15 parts of water, heated to 80°C for 3 hours. After the reaction is complete, add 1 part of 10 -5 mol / L of Me 3 SiNHSiMe 3 Adjust the pH value of the reaction system to neutral with the ethanol solution; distill off the solvent and the ethanol and unreacted water produced by the reaction at 90°C. Raise the temperature to 110°C, continue the reaction for 0.5 hours, cool to room temperature, add 120 parts of ethanol to dissolve, and filter to obtain 200 parts of the silicone fluororesin prepolymer solution with a concentration of 40%, which is the silicone fluorine water repellent. Its γ(R / Si) is 1.2. According to JC / T 902-2002, the measured water absorption ratio is 11.5% and the contact angle is 131°

Embodiment 3

[0023] Put 100 parts of methyltriethoxysilane, 790 parts of hydroxyfluorosilicone with 4% hydroxyl value, 100 parts of ethanol, and 500 parts of acetone in the reaction flask at room temperature, and add 1 part of 10 under stirring. -5 Dilute hydrochloric acid of mol / L is the catalyst and 12 parts of water, heated to 80°C for 5 hours. After the reaction is complete, add 1 part of 10 -5 mol / L of Me 3 SiNHSiMe 3 Adjust the pH value of the reaction system to neutral with the ethanol solution; distill off the solvent and the ethanol and unreacted water produced by the reaction at 90°C. Raise the temperature to 110°C, continue the reaction for 1.5 hours, cool to room temperature, add 350 parts of ethanol and 500 parts of acetone mixed solvent to dissolve, filter to obtain 1700 parts of a silicone fluororesin prepolymer solution with a concentration of 50%, which is Organosilicon fluorine waterproofing agent, its γ(R / Si) is 1.9. According to JC / T902-2002, the measured water absorption r...

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Abstract

An organic Si-F water-proofing agent is composed of solvent and the organic Si-F resin prepolymer which is prepared from one or more alkyl siloxane coupling agents and hydroxy F-Si oil through catalytic hydrolysis reaction. Its preparing process is also disclosed. Its advantages are high water-proofing effect and high resistance to solvent, acid, alkali and ageing.

Description

Technical field [0001] The invention relates to a waterproofing agent for building surfaces, and the invention also relates to a preparation method of a waterproofing agent for building surfaces. Background technique [0002] Silicone resin has excellent properties such as high and low temperature resistance, aging resistance, water repellency, electrical insulation, flame retardancy, non-toxic and non-corrosive, especially its unique water repellency and air permeability. It is considered an ideal waterproof coating and is widely used Used for waterproof protection of building and material surface. The organic silicon building waterproofing agent chemically reacts with the surface of the building material to form a layer of insoluble silicone resin film with a thickness of several molecules on the surface of the substrate, which reduces the surface tension of the building material to the surface tension of the organic silicon and increases the contact with water. The “anti-capil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/18
Inventor 郭庆中黄恒超伍青
Owner GUANGZHOU BAIYUN CHEM IND
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