A kind of hydrophobic silica sol precursor composition and preparation method thereof

A composition, silica sol technology, applied in the direction of alkali metal silicate coatings, coatings, etc., can solve the problems of short storage period, insufficient waterproofness, and insufficient dense film formation, so as to solve the problem of short storage period and realize water solubility. , the effect of improving hydrophobicity

Active Publication Date: 2022-02-25
厦门锶特材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above method directly obtains a sol-type product. Due to the thermodynamic instability of the sol itself, coupled with the decreased stability after modification, the product has a short storage period and is difficult to commercialize.
On the other hand, the preparation process is complex and has precise requirements on reaction conditions, water quality, pH value, etc., which is not conducive to large-scale production
More importantly, practice has shown that using hydrophobically modified silica sol directly as a waterproofing agent, although the hydrophobicity is excellent, the film formation is not dense enough, resulting in insufficient waterproofing, which still cannot meet the requirements of building waterproofing

Method used

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  • A kind of hydrophobic silica sol precursor composition and preparation method thereof
  • A kind of hydrophobic silica sol precursor composition and preparation method thereof
  • A kind of hydrophobic silica sol precursor composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Preparation of Hydrophobic Silica Sol Precursor Composition 1

[0072] a) 7 parts by weight of hexamethyldisiloxane (monofunctional silane component A), 40 parts by weight of dimethyldimethoxysilane (bifunctional silane component B), 5 parts by weight of KH550 ( Silane coupling agent C), 15 parts by weight of isobutanol (solvent D) and 10 parts by weight of triethanolamine (organic base E) are stirred evenly in a double-layer reactor with a reflux device, heated by hot oil to maintain the system The temperature was refluxed at 65°C to obtain the mixed solution X1,

[0073] b) 15 parts by weight of sodium hydroxide (inorganic base F) is added to 20 parts by weight of water and stirred evenly to obtain lye Y1,

[0074] c) Keep the temperature at reflux at 65°C, and add the lye Y1 into the mixed solution X1 under stirring. After the addition is complete, collect and distill off part of the small molecule solvent, raise the temperature to 90°C and reflux for 0.5h to obtain...

Embodiment 2

[0079] Preparation of Hydrophobic Silica Sol Precursor Composition 2

[0080] a) 5 parts by weight of hexamethyldisiloxane (monofunctional silane component A), 30 parts by weight of hydroxyl silicone oil (bifunctional silane component B), 5 parts by weight of KH790 (silane coupling agent C) 10 parts by weight of n-butanol (solvent D) and 15 parts by weight of diethanolamine (organic base E) are stirred evenly in a double-layer reactor with a reflux device, heated by heating oil, and the temperature of the system is kept at 70 ° C for reflux. Get the mixed solution X2,

[0081] b) 15 parts by weight of potassium hydroxide (inorganic base F) is added to 20 parts by weight of water and stirred evenly to obtain lye Y2,

[0082] c) Keep the temperature at 70°C and reflux, and add the lye Y2 into the mixed solution X2 under stirring. After the addition is complete, collect and distill off part of the small molecule solvent, raise the temperature to 95°C and reflux for 0.5h to obtai...

Embodiment 3

[0087] Preparation of Hydrophobic Silica Sol Precursor Composition 3

[0088] a) 10 parts by weight of hexamethyldisilazane (monofunctional silane component A), 35 parts by weight of dimethyldiethoxysilane (bifunctional silane component B), 5 parts by weight of KH560 ( Silane coupling agent C), 10 parts by weight of ethylene glycol butyl ether (solvent D) and 15 parts by weight of ethanolamine (organic base E) are stirred evenly in a double-layer reactor with a reflux device, and heated by hot oil to keep The temperature of the system was refluxed at 70°C to obtain a mixed solution X3,

[0089] b) 20 parts by weight of potassium hydroxide (inorganic base F) is added to 30 parts by weight of water and stirred evenly to obtain lye Y3,

[0090] c) Keep the temperature at reflux at 70°C, and add the lye Y3 into the mixed solution X3 under stirring. After the addition is complete, collect and fractionate the small molecule solvent, raise the temperature to 95°C and reflux for 0.5h...

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Abstract

The invention relates to a hydrophobic silica sol precursor composition and a preparation method thereof. The composition includes: 5-10 parts by weight of monofunctional silane component A, 30-50 parts by weight of bifunctional silane component B, 5-10 parts by weight of silane coupling agent C, 10-5 parts by weight 20 parts by weight of solvent D, 5-15 parts by weight of organic base E, 10-20 parts by weight of inorganic base F, 0.4-0.6 parts by weight of organosiloxane polyether G, 0.1-0.3 parts by weight of long-chain alkyl Benzenesulfonate H, 0.1-0.3 parts of organic silicon phosphate I and 10-40 parts of water glass J. The hydrophobic silica sol precursor composition prepared according to the invention and the waterproofing agent prepared therefrom not only improve the hydrophobicity, but also ensure sufficient waterproofness of the material.

Description

technical field [0001] The present invention relates to a hydrophobic silica sol precursor composition, specifically, the present invention relates to a hydrophobic silica sol precursor composition and a preparation method thereof, and the waterproofing agent composition can be applied to building waterproofing. Background technique [0002] The absorption of water and other harmful substances is one of the main factors that cause various lesions in buildings, and even cause structural or functional damage. Therefore, waterproof engineering has become an indispensable process in building construction. At present, the commonly used building waterproof materials are mainly methyl silicate aqueous solution, which is popular because of its safety, environmental protection, and economic advantages. Especially in the field of stone protection occupies a pivotal position. [0003] With the development of economy and society, people's living standards are improved, and the requirem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/08C09D183/06C09D183/14C09D1/04C04B41/84
CPCC09D183/08C09D183/06C09D183/14C09D1/04C04B41/495C04B41/84C04B41/009C04B28/00C04B41/4535
Inventor 倪永金祁正兵
Owner 厦门锶特材料科技有限公司
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