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Organic silicon fluoro water proofing agent and its preparation method

A technology of waterproofing agent and silicone, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of large-scale application gap and high price, and achieve the effects of improving solvent resistance, reducing water absorption ratio, and improving waterproof life

Active Publication Date: 2006-01-11
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] At room temperature, put 100 parts of methyltriethoxysilane, 88 parts of hydroxyfluorosilicone oil with a hydroxyl value of 5%, and 120 parts of ethanol in a reaction bottle, and add 1 part of 10 -5 mol / L dilute hydrochloric acid as 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 / LMe 3 SiNHSiMe 3 Adjust the pH value of the reaction system to neutral with the ethanol solution; distill off the solvent, ethanol and unreacted water generated 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 50% organosilicon fluorine resin prepolymer solution, which is the organosilicon fluorine water repellent. Its γ(R / Si) was 1.5. According to JC / T 902-2002, the measured water absorption ratio is: 8.9%, and the contact angle is 134°; while the γ(CH 3 The water absorption ra...

Embodiment 2

[0021] At room temperature, put 100 parts of methyltriethoxysilane, 22 parts of hydroxyfluorosilicone oil with a hydroxyl value of 6%, and 80 parts of ethanol in a reaction bottle, and add 1 part of 10 -5 mol / L dilute hydrochloric acid as 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 Me 3 SiNHSiMe 3 Adjust the pH value of the reaction system to neutral with the ethanol solution; distill off the solvent, ethanol and unreacted water generated 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 a 40% organosilicon fluorine resin prepolymer solution, which is the organosilicon fluorine water repellent. Its γ(R / Si) was 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] At room temperature, 100 parts of methyltriethoxysilane, 790 parts of hydroxyfluorosilicone oil with a hydroxyl value of 4%, 100 parts of ethanol, and 500 parts of acetone were placed in a reaction bottle, and 1 part of 10 -5 mol / L dilute hydrochloric acid as 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 Me 3 SiNHSiMe 3 Adjust the pH value of the reaction system to neutral with the ethanol solution; distill off the solvent, ethanol and unreacted water generated 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, and filter to obtain 1700 parts of a 50% organosilicon fluororesin prepolymer solution, which is Organosilicon fluorine water repellent, its γ(R / Si) is 1.9. According to JC / T902-2002, the measured water absorption ratio is: 10.4%, and the contac...

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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 also relates to a preparation method of the 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 retardant, non-toxic and non-corrosive, especially its unique water repellency and air permeability, it is considered as an ideal waterproof coating, and is widely used Applied to the waterproof protection of buildings and material surfaces. Silicone building waterproofing agent chemically reacts with the surface of building materials to form a layer of insoluble silicone resin film with a thickness of several molecules on the surface of the substrate, reducing the surface tension of building materials to that of silicone and increasing the water resistance. Therefore, it is hydrophobic; at the same time, air and wat...

Claims

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Application Information

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