Low-volatile and environment-friendly silane paste impregnant and preparation method thereof

Abstract

The invention relates to a low-volatile and environment-friendly silane paste impregnant and a preparation method thereof. The silane paste impregnant is prepared from the following formula raw materials by weight percent: 40-70% of alkyl alkoxy silane, 10-40% of a reactive siloxane oligomer, 4-15% of cyclic siloxane, 0.5-2% of a surface active agent and 10-20% of deionized water. The silane pasteimpregnant provided by the invention is prepared by taking the alkyl alkoxy silane with two functional groups, the cyclic siloxane, the alkyl alkoxy silane with three functional groups, and the siloxane oligomer as main components and cooperatively using a small amount of the surface active agent; the prepared silane paste impregnant not only meets the requirements of JTJ 275-2000 Anti-corrosionTechnical Specification for Concrete Structures in Harbour Engineering, but also produces less volatilization loss in a construction process; after the silane paste impregnant is used, volatile organic compounds-methanol / ethanol generated in a reaction in a paste curing process are significantly reduced, so that the environment is better protected; furthermore, the silane paste impregnant is shortin curing time after construction, and a water drop effect can be generated within a short time.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-volatility and environment-friendly silane paste impregnating agent and a preparation method thereof. Background technique [0002] Research at home and abroad shows that building waterproofing is an effective method to improve the durability of concrete structures. Silane materials in building waterproof materials are widely used in various construction projects because of their excellent waterproof durability and air permeability. Silane is a high-permeability waterproof material, sprayed on the concrete surface in the form of solution, emulsion or paste, which can improve the waterproof and anti-corrosion performance of concrete. As for the solution type silane protective agent, its application is limited because there is usually a solvent component in the formula, which is likely to cause environmental pollution. Emulsion-based silane protective...

AI Technical Summary

Problems solved by technology

[0003] Existing technologies such as: patent CN101746988A uses a large amount of organic solvents in the process of producing silane paste, which is not conducive to environmental protection, and will cause a lot of pollution during construction and use

The preparation process of the silane paste disclosed in the patent CN104926366A is complicated, and the production process needs to be heated, which will cause an increase in production energy consumption

In the preparation method of silane paste protective agent disclosed in patent CN101367670A, the content of emulsifier is as high as 4.0% or more, and the use of a large amount of emulsifier will reduce the waterproof protection performance of silane paste

Contain a large amount of thickeners-hydrophobic silicon dioxide and hydrogenated castor oil in the prescription of silane paste protective agent disclosed in CN106186803A, although hydrophobic silicon dioxide can increase the viscosity of system, but silane paste is brushed to the substrate surface, After infiltration and curing, this inorganic thickener will eventually remain on the surface of the substrate, resulting in changes in the appearance of the substrate surface

The formula of the silane paste disclosed by CN103626518A contains fumed silica and perfluoroalkylsilane-perfluoropropyltriethoxysilane, perfluorooctyltriethoxysilane, although the use of perfluoroalkylsilane can Increase penetration depth and surface hydrophobicity, but expensive, not suitable for mass production and promotion

[0004] In summary, there are various problems in the existing silane paste impregnating agent and its preparation technology, either the amount of emulsifier or thickener used is too large, the waterproof and protective effect is insufficient, or the added fumed silica will remain in the Changes in the appearance of the substrate can be caused by adding expensive additives, regardless of the cost of the product. Moreover, the main ingredients in these silane paste formulations are basically small molecule alkyltrimethoxysilane or alkyltriethylsilane Oxysilane, not only the volatilization of silane itself, but also the release of a large amount of methanol / ethanol during later curing, which is not conducive to environmental protection