Sustained-release silane powder, super-hydrophobic cement-based flexible waterproof coating and preparation method thereof

Abstract

The invention relates to the technical field of waterproof materials, and more particularly discloses a super-hydrophobic cement-based flexible waterproof coating which is composed of a liquid material and a powder material. The liquid material is prepared from the following raw materials in parts by weight: 60 to 80 parts of vinyl versatate, 5 to 20 parts of modified carboxylic styrene-butadienelatex, 0.2 to 0.6 part of defoaming agent, 0.2 to 1 part of coalescing agent, 0.1 to 0.5 part of fungicide, and 5 to 20 parts of water; and the powder material is prepared from the following raw materials in parts by weight: 30 to 45 parts of portland cement, 5 to 10 parts of aluminate cement, 5 to 10 parts of gypsum, 0.4 to 2 parts of sustained-release silane powder, 20 to 40 parts of quartz sand, 5 to 20 parts of calcium triple superphosphate, 0.1 to 0.5 part of thixotropic agent, and 0.2 to 0.5 part of water reducer. The waterproof coating is extremely low in water absorption, excellent inwater resistance and anti-permeability, and high in bonding strength with mortar or concrete base surfaces, and thus can be used in a waterlogging environment for a long time.

Description

technical field [0001] The invention relates to the technical field of waterproof materials, in particular to a slow-release silane powder, a superhydrophobic cement-based flexible waterproof coating and a preparation method thereof. Background technique [0002] Waterproof materials have experienced four generations of development. The first generation of waterproof materials is asphalt membranes. Asphalt membranes still occupy a large share in the field of roof waterproofing due to their cheap price, low requirements for base materials and fast construction speed. Containing tar components will cause great pollution to the human body and the environment, and the outdoor durability is poor, and it is not easy to clean up during maintenance; the second-generation waterproof material is polyurethane, which contains volatile and toxic solvents, so it is prohibited to use , has been eliminated by the market; the third-generation waterproof material is acrylic, and acrylic is a ...

AI Technical Summary

Problems solved by technology

However, most cement-based waterproof coatings directly add silane or silane emulsion to the cement slurry, which cannot effectively improve the water absorption performance of the coating

Because after the cement is hydrated, the cement slurry is in an alkaline environment, and the silane functional group is hydrolyzed to form ≡Si-OH, which undergoes a dehydration condensation reaction with the hydroxyl group on the surface of the cement particle to form a hydrated siloxane group ≡Si-O-Si≡, and this This functional group is preferentially adsorbed on the surface of negatively charged silicate minerals to form a superhydrophobic group, which hinders the transport of the medium. Therefore, directly adding silane or silane emulsion to the cement slurry will seriously affect the hydration of the cement, resulting in cement hydration. The degree is low, the gel pores become more, and its own water absorption cannot be significantly reduced

Therefore, the durability of existing waterproof coatings still cannot meet the waterproof requirements of cement-based materials in long-term water immersion environments.

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