Waterproof coating and preparation method thereof

Abstract

A waterproof coating comprises, by weight, 75-85% of a special high polymer emulsion, 0.5-1.5% of a water repellent, 0.1-0.5% of a defoaming agent, 0.1-0.5% of a thickening agent, 0.5-1.0% of a coupling agent, 0.1-0.5% of a bactericide and 15-25% of water, wherein the special high polymer emulsion comprises 15-25% of butyl acrylate, 8-20% of methyl methacrylate, 8-20% of styrene, 0.2-1.0% of methacrylic acid, 0.1-0.5% of acrylamide, 0.5-2% of an organosilicon monomer, 0.5-2% of a compound emulsifier, 0.02-0.2% of a buffer agent, 0.3-1.2% of an initiator, 0.05-0.2% of a defoaming agent, 0.1-0.5% of a pH adjusting agent, 0.05-0.2% of an antiseptic bactericide and 45-55% of water. The invention also discloses a preparation method of the waterproof coating. The waterproof coating disclosed bythe invention is good in water white resistance, environment-friendly and non-toxic, and the strength of a waterproof film is improved while the low-temperature film forming performance is guaranteed.

Description

technical field [0001] The scheme belongs to the field of chemical materials, specifically the application field of building chemical materials. Background technique [0002] Waterproofing of exterior walls is an important part of construction engineering. Leakage is also a prominent quality problem in buildings. Leakage not only disrupts people's normal life, but also directly affects the service life of the entire building. Commonly used in the market Some polymer compound coatings are painted on the surface of the exterior wall as a waterproof layer to improve the waterproof performance of the building. [0003] However, in the long-term practice process, it has been found that there are two problems in the waterproof coating in the prior art: first, the water whitening resistance is poor, mainly because there are more hydrophilic materials such as surfactants in the raw materials of the waterproof coating, which are hydrophilic Molecules with polar groups in water mater...

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Problems solved by technology

[0003] However, in the long-term practice process, it has been found that there are two problems in the waterproof coating in the prior art: first, the water whitening resistance is poor, mainly because there are more hydrophilic materials such as surfactants in the raw materials of the waterproof coating, which are hydrophilic Molecules with polar groups in water materials have great affinity for water and can attract water molecules. Water can spread on the surface of hydrophilic materials, and can automatically absorb water into the material through capillary action, resulting in material Whitening, destroying the internal structure of the material, affecting various properties of the waterproof material, obviously, this is very unfavorable for a waterproof material; then the existing waterproof coating uses harmful substances such as plasticizers, because the waterproof coating Generally, they are rigid high polymers to ensure that the waterproof coating has sufficient strength, and the low-temperature film-forming performance needs to be realized by plasticizers. Therefore, it is difficult for conventional high-polymer emulsions to balance the cohesive strength and low-temperature film-forming performance. A large-scale, large-scale use of materials, waterproof coatings contain plasticizers and other harmful substances will have adverse effects on the human body, the environment, etc.

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