Cement waterproof agent and method for preparing same

Abstract

The invention discloses a cement waterproof agent. The cement waterproof agent is prepared from the raw materials of latex of styrene-acrylic acid copolymers, purified water, self-emulsifying type paraffin, a defoaming agent, an oxidant and a mildew inhibitor. The method for preparing the cement waterproof agent comprises the following steps of: adding purified water in a reaction kettle, and heating the purified water to the temperature of 80 and 90 DEG C; adding the self-emulsifying type paraffin while stirring, adding the defoaming agent, the oxidant and the mildew inhibitor in sequence after the self-emulsifying type paraffin is completely dissolved, and stopping heating; and when the mixed solution is cooled to the temperature of below 40 DEG C, adding the latex of styrene-acrylic acid copolymers and evenly stirring, adjusting a pH value to a set value, and obtaining the finished product. The cement waterproof agent is waterborne opaque milk white liquid. The cement waterproof agent can resist water, moisture, freezing, pressure and cracks, does not contain organic solvents, is non-toxic and harmless to bodies of production and operating personnel, and does not cause environmental pollution; and by adding a proper amount of lithopone and the like, a novel super waterproof paint can be produced.

Description

technical field [0001] The invention relates to a chemical polymer emulsion-like waterproofing agent used as an effective component of mortar and concrete, in particular to a cement waterproofing agent and a preparation method thereof. Background technique [0002] Concrete itself is porous and not all spaces are filled with aggregate in solid state. The cement will produce pores through the hydration process, and air bubbles will also be generated during the concrete mixing process. When the free water combines with the voids in the concrete, the final concrete structure will have water permeability, so that the water will enter the concrete structure under static pressure or capillary action, and damage the concrete structure over time. The look will also age, lose its luster and smudge causing fading. Although the concrete manufacturing industry uses high-quality aggregates, the cement is mixed in an appropriate proportion and fully cured, the inherent pores in the conc...

AI Technical Summary

Problems solved by technology

However, expansion agents are mostly used in underground projects, where the underground working temperature changes little and moderately, and the concrete dries and shrinks and shrinks when heated and cooled, and has a good waterproof effect, but it is not ideal for underground use.

In recent years, many projects have adopted the technical measures of composite waterproofing of rigid plates and flexible joints, that is, the so-called rigid-flexible waterproof layer with appropriate structural deformation. Rigid plates are mainly made of self-compacting concrete, hydrophobic concrete or expansive concrete, self-stressed concrete, etc. The joints are divided into boards, and flexible materials such as ointment are used to caulk the joints, but the boundary is difficult to handle, and the quality of the caulking paste is often not good enough. After a winter freeze-thaw cycle, it is very easy to be brittle, and the ointment and the concrete are completely separated. become a source of leakage, resulting in waterproof failure