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A kind of water-based hydrophobic agent and preparation method thereof

A hydrophobic agent, water-based technology, applied in the direction of coating, etc., can solve the problems of unstable properties of silica sol, unsatisfactory hydrophobic effect, etc., and achieve the effects of easy promotion, extended shelf life, and low price

Active Publication Date: 2017-08-25
鹤山市顺鑫实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of the modified silica sol are not stable, and the hydrophobic effect is not satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Stir 100 parts of acidic silica sol and 23 parts of polyacrylic acid emulsion evenly, add 1 part of anionic surfactant (mixed by Span 80 and Tween 20 in a weight ratio of 1:1), and heat up to 40-60°C under stirring , 7 parts of silicone modifier (mixed by methyltrimethoxysilane and hexadecyltrimethoxysilane according to the weight ratio of 7:3) were added dropwise within 1.5h, kept for 5h, and cooled under stirring.

Embodiment 2

[0020] Stir 100 parts of acidic silica sol and 30 parts of polyacrylic acid emulsion evenly, add 0.8 parts of anionic surfactant (mixed by Emcol EO-50 and Tween 40 at a weight ratio of 1:1), and heat up to 55°C while stirring. Add 5 parts of organosilicon modifier (octadecyltriethoxysilane) dropwise within 1.5 hours, keep warm for 5 hours, and cool under stirring.

Embodiment 3

[0022] Stir 100 parts of acidic silica sol and 20 parts of polyacrylic acid emulsion evenly, add 1 part of anionic surfactant (mixed by MOA-3 and PEG400 according to the weight ratio of 1:1), heat up to 45°C under stirring, within 1.5h Add 10 parts of organosilicon modifier (methyltriethoxysilane) dropwise, keep warm for 5 hours, and cool under stirring.

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PUM

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Abstract

The invention discloses a water-based hydrophobic agent, which comprises 80-120 parts of acidic silica sol, 20-30 parts of polyacrylic acid emulsion, 0.5-1 part of anionic surfactant and 5-10 parts of organosilicon modifier according to parts by weight . The anionic surfactant is formed by mixing two types of anionic surfactants with hydrophilic-lipophilic balance values ​​of 2-7 and 12-17. The invention also discloses a preparation method of the water-based hydrophobic agent. The water-based hydrophobic agent of the present invention has a wide range of applications, low raw material price, green and environmental protection, easy to popularize, and the shelf life is extended by more than 3 times; the initial contact angle of the hydrophobic film formed by the water-based hydrophobic agent is as high as 140°, which belongs to super-hydrophobic, and is resistant to scrubbing. Has better durability.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a water-based hydrophobic agent and a preparation method thereof. Background technique [0002] Water-based hydrophobic agent is an aqueous dispersion of a mixture of compounds, which can form a special water-resistant structure (change the contact angle) after film formation, making the surface of the object extremely hydrophobic, water-repellent, and waterproof. At present, there are many kinds of hydrophobic agents, which are generally silicone emulsions. They are added as additives to latex paints, and there are certain requirements for the amount of addition. If the amount is small, the effect will be affected. If the amount is too large, the quality of the paint film will be affected. And the price is high, not suitable for use in some low-grade materials. Silica sol is green and environmentally friendly, cheap and easy to obtain, and its surface can be modified by organic silicon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/00C09D7/12
Inventor 刘德强林国旺李秋凯李良
Owner 鹤山市顺鑫实业有限公司