High stable water chain alkyl silane emulsion and preparation method thereof

Abstract

The invention relates to a highly stable aqueous chain alkyl silane emulsion and a preparation method. The emulsion includes continuous aqueous phase, dispersed hydrolyzable alkoxy silane oil phase and emulsifier; the weight ratio of hydrolyzable alkoxy silane, emulsifier and water is 10 to 65:2 to 15:20 to 88. The hydrolyzable alkoxy silane oil phase is composed of chain alkyl trialkoxysilane R1Si (OR2) 3, trialkoxysilane R3Si (OR2) 3 or dialkoxysilane R4R5Si (OR2) 2 and the corresponding hydrolysis polycondensation oligomer, wherein, substituents R1 and R4 are C1 to 18 chain alkyls, R2 is methyl, ethyl, propyl, etc., and R3 and R5 are acryloyl oxy propyl, ethenyl, amino propyl, Gamma-glycidyl ether oxyl, etc. The emulsifier is nonionic and ionic complex, including OP series, Span series, Tween series and a composite system composed of sodium dodecyl sulfonate, sodium dodecyl sulfate and dodecyl benzene sulfonate.

Description

technical field [0001] The invention relates to a highly stable water-based chain alkyl silane emulsion and a preparation method thereof, which are widely used in architectural waterproof coatings for building interior and exterior decoration, cement, marble, granite, ceramic tiles and other silicate materials. Background technique [0002] Organosilicon is widely used because of its excellent performance. For example, it can be used as an excellent functional waterproof coating. According to its dispersion medium, it can be divided into solvent type and water emulsion type. [0003] U.S. Patent No. 3 772 065, U.S. 4 937 104 proposed that trioxane-based organosilane and siloxane be dissolved in organic solvents (such as ethanol, hydrocarbon solvents) for waterproofing of masonry and mineral materials, but due to Organic solvents are usually flammable, expensive, and have adverse effects on the environment and physiology, so their applications are limited. [0004] With the ...

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Problems solved by technology

[0009] Since the application of alkoxysilane in water emulsion can cause the reaction of hydrolysis and polycondensation of alkoxysilane to form siloxane, the particle size of the emulsion increases with time, thereby affecting its stability. Therefore, a stable hydrolyzable Alkoxysilane emulsions have great difficulties, and the above-mentioned patents do not solve the problem of particle size increasing with time, and most of them use special equipment such as high-speed dispersers or homogenizers, which have high preparation costs and are not conducive to large-scale industrialization. Production