Two-component normal temperature non-curing asphalt polyurethane waterproof coating and preparation method thereof

Abstract

The invention discloses a two-component polyurethane asphalt waterproof coating and a preparation method thereof. The waterproof coating comprises a component A and a component B. The component A comprises modified polyurethane prepolymer obtained by a reaction of polyurethane prepolymer with first hydroxyl-terminated polybutadiene, and the polyurethane prepolymer is prepared by a reaction of polyol and polyisocyanate; the component B is prepared from petroleum asphalt, second hydroxyl-terminated polybutadiene, and a secondary amine curing agent and / or a primary amine curing agent; the first and second hydroxyl-terminated polybutadiene are respectively and independently selected from one or more combinations of compounds in a formula (I) (please see the specification for the formula), of structural monomers in the formula (I), monomers represented by a account for 10-30%, monomers represented by b account for 50-70%, and monomers represented by c account for 10-30%; the preparation method comprises the following step that the components A and B are respectively prepared and then mixed to obtain the waterproof coating; and according to the waterproof coating, the non-curing effect at the normal temperature can be achieved, the coating has good stability, good dispersion uniformity can always be maintained, and the stability of physical and mechanical properties and other properties of the coating can be ensured.

Description

technical field [0001] The invention belongs to the field of building waterproofing, in particular to a two-component room temperature non-curing asphalt polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Waterproof coating The waterproof film formed by the coating on the base layer after curing has certain strength, good extensibility, crack resistance, impermeability and weather resistance, and has good temperature adaptability, easy operation and easy maintenance. and maintenance. Compared with the waterproof membrane, the waterproof coating has strong adaptability to the base layer, and the waterproof layer has no seams, which is more reliable. Due to the above characteristics, waterproof coating is one of the main waterproof materials often used in waterproofing projects. [0003] Currently used waterproof coatings are generally emulsions or contain solvents, but solvents are gradually abandoned due to the need for environm...

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Problems solved by technology

[0004] However, although this patent achieves a better non-curing effect, in order to solve the poor compatibility between polyurethane prepolymer and petroleum asphalt, a specific compatibilizer is added, but these compatibilizers will gradually segregate over time The problems that come out, and then cause the polyurethane prepolymer and petroleum asphalt to delaminate each other, destroy the physical and mechanical properties of the coating, on the one hand reduce the storage stability, even if it has been applied to the wall waterproof, the gradually segregated compatibilizer will still reduce The performance of waterproof coating, on the other hand, this waterproof coating is a single component, which requires latent curing agent to react in the presence of water to produce amine or alcohol amine and then react with isocyanate group to cure, but after it is applied to the wall waterproof, It takes a long time for it to absorb moisture in the air or concrete to cross-link, which not only delays the construction period, but also has uneven cross-linking degree and insufficient cross-linking in the coating.

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