Crystalline self-repairing polymer cement-based waterproof material and preparation method thereof

Abstract

The invention discloses a crystalline self-repairing polymer cement-based waterproof material and a preparation method thereof. The crystalline self-repairing polymer cement-based waterproof materialis prepared from the following raw materials in percentage by mass: 27 to 35 percent of Portland cement, 18 to 24 percent of quartz sand, 0.8 to 1 percent of vinyl silane coupling agent, 6 to 9.5 percent of an excitant, 0.2 to 0.5 percent of an ultraviolet light absorber and 30 to 48 percent of modified polyacrylate emulsion, the preparation method of the modified polyacrylate emulsion comprises the following steps: I, weighing; II, adding an acrylate monomer and methacrylic acid into ethanol, stirring and dissolving to obtain a solution A; III, adding sodium itaconate, sodium p-styrenesulfonate, tetrasodium iminodisuccinate and an initiator into deionized water, and stirring for dissolving to obtain a solution B; and IV, uniformly mixing the solution A and the solution B, transferring into a reaction kettle, and carrying out copolymerization reaction at 70-100 DEG C for 3-6 hours, thereby obtaining the product. According to the invention, structures such as -COONa and -SO3Na are introduced into a copolymer to form a copolymer emulsion with a chelating effect and an emulsifying and dispersing effect, so that a modified polyacrylate-concrete stably combined compact waterproof layeris formed.

Description

technical field [0001] The invention belongs to the technical field of waterproof materials, and in particular relates to a crystalline self-repairing polymer cement-based waterproof material and a preparation method thereof. Background technique [0002] Polymer cement-based waterproof material is a liquid material composed of polymer emulsion such as polyacrylate, polyvinyl acetate, styrene-butadiene rubber emulsion and various additives, and a matching powder composed of cement and graded sand. The two-component waterproof coating made of composite materials not only has the advantages of high elasticity of synthetic polymer materials, but also has the advantages of strong mechanical strength and good durability of inorganic materials. However, since the polymer cement-based waterproof coating is composed of organic polymer emulsion and inorganic cement powder, the compatibility and dispersion of the organic phase and the inorganic phase are poor, which affects the qualit...

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Problems solved by technology

For example, the patent application number CN201310213586.5 discloses a self-crystallizing polymer cement-based waterproof coating and a preparation method thereof, using nano-crystallization agents such as magnesium-lithium silicate, magnesium-aluminum silicate, and sodium-based bentonite to contact with water, and quickly Expanded crystals form a three-dimensional colloidal structure; for example, the patent application number CN201911323960.0 discloses a cement-based permeable crystalline waterproof material and its preparation method, using cyclobutane carboxylic acid and 18-crown-6 as catalysts, Make Ca 2+ and SiO 3 2- The reaction is more thorough; but the above-mentioned crystallization agent is mainly through physical changes or Ca in cement 2+ and SiO 3 2- However, it cannot completely solve the phenomenon of delamination and cracking due to the compatibility or dispersion of organic polymers, inorganic cement, and quartz sand powder.

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