Two-component polyurethane waterproof coating and preparation method thereof

Abstract

The invention provides a two-component polyurethane waterproof coating. The two-component polyurethane waterproof coating comprises a component A and a component B, wherein the component A comprises 45 to 60 parts of polyether polyol 330N, 70 to 85 parts of polyether polyol 220, 5 to 15 parts of a plasticizer, 15 to 20 parts of toluene diisocyanate and 10 to 15 parts of diphenylmethane diisocyanate; and the component B comprises 25 to 30 parts of polyether 330N, 15 to 25 parts of 3,3'-dichloro-4,4'-diamino diphenyl methane, 20 to 30 parts of diisononyl ortho-phthalate, 100 to 110 parts of chlorinated paraffin, 120 to 150 parts of light calcium carbonate, 45 to 55 parts of fly ash, 2 to 5 parts of a dispersant, 0.6 to 1.5 parts of an antifoaming agent, 0.3 to 2 parts of dibutyltin dilaurateand 0.5 to 1 part of a heat stabilizer 903. The invention provides the two-component polyurethane waterproof coating and the preparation method thereof. According to the invention, through physical activities like particle effect and micro-aggregate effect of the fly ash, cementitious activities of a product can be promoted, and performances of the product are improved; meanwhile, by utilizationof a composite cross-linking agent, the proportion of rigid chain segments in a molecular chain is increased, so tensile strength and hardness are enlarged.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a two-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coating is a polymer waterproof coating made of isocyanate and polyether polyol as the main raw material, mixed with various additives and fillers. It is divided into two types: single-component and two-component. Coated on the base layer, it can form a continuous, flexible and seamless rubber waterproof membrane after reaction and curing. Among them, the two-component polyurethane waterproof coating is widely used in construction, furniture coating, industrial machinery manufacturing, automobile, It is one of the coating varieties with better comprehensive performance widely used at present. [0003] Patent CN101418184 discloses a two-component polyurethane waterproof coating, which is composed of components A and B in parts by weight; component A cons...

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Problems solved by technology

[0003] Patent CN101418184 discloses a two-component polyurethane waterproof coating, which is composed of components A and B in parts by weight; component A consists of 60-70 parts of toluene diisocyanate MDI, 7-10 parts of polyether N-330, 16.8 -30.9 parts of polyether N-220, 2-3 parts of amino-terminated polyether resin and 0.1-0.2 parts of stabilizer tartaric acid; component B consists of 20-30 parts of polyether N-330, 0.5-1 part of antioxidant, 3 - Composed of 5 parts of coloring pigment, 4-8 parts of vulcanizing agent MOCA, 10-20 parts of minus tetra oil, 8-20 parts of chlorinated paraffin, 4-8 parts of plasticizer DOP and 15-20 parts of sericite powder, the coating has The advantages of high solid content, high strength, and high elongation at break are especially suitable for high-speed railways, highways, passenger dedicated lines, and concrete bridge decks with passenger and cargo lines as waterproof layers, but its acid and alkali resistance is not high

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