Polyvinyl chloride-polyvinylidene emulsion based concrete bridge structure surface protective coating material and preparation method thereof

Abstract

The invention relates to a polyvinyl chloride-polyvinylidene emulsion based concrete bridge structure surface protective coating material and a preparation method thereof. Most of existing concrete surface protective coatings are poor in carbonization resistance and ageing resistance and complex in painting process. The coating material is composed of 80-90 parts of polyvinyl chloride-polyvinylidene emulsion, 1-3 parts of bentonite, 0.3-1 part of aqueous antiager, 1-5 parts of titanium dioxide, 1-5 parts of sericite, 2-10 parts of functional assistant system and 2-9 parts of adjustment assistant system, wherein the adjustment assistant system is composed of antifoaming agent, dispersing agent and leveling thickener according to the mass ratio of 2:1:4. The coating material enables concrete to have excellent protective effects under accelerated carbonizing conditions, carbonization of the concrete is decelerated, the coating material is excellent in ageing resistance, the coating painting process is simple, all procedures from production to construction are safe and environment-friendly, and environment pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of concrete protection, and in particular relates to a protective coating material for the surface of concrete bridge structures based on chlorine partial emulsion and a preparation method thereof. Background technique [0002] Concrete is a widely used building material with excellent durability, but under the long-term erosion of the general atmospheric environment (carbon dioxide, water, oxygen, etc.) and its own performance defects (pores, micro-cracks, etc.), concrete carbonation will occur Corrosion, and directly lead to the occurrence of corrosion of its internal steel bars, thus causing a series of diseases such as concrete spalling, rust swelling cracks, etc., seriously restricting the durability and safety of concrete bridges. [0003] Carbonation of concrete is mainly due to CO 2 Diffusion penetrates into the interior of the concrete, and the pores near the reinforcement in the concrete Ca(OH) ...

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Problems solved by technology

[0004] At present, the existing concrete surface protective coatings mainly have the following shortcomings: First, the anti-carbonation performance is poor, and the carbonation depth is generally greater than the specification requirements (standard requirements ≤ 1mm), concrete The phenomenon of carbonization corrosion is serious, which in turn causes the corrosion of internal steel bars, leading to concrete rust and peeling and other diseases; second, the anti-aging performance is poor, and similar domestic protective coatings will appear wrinkling, yellowing, cracking, powdering, etc. to varying degrees in about 800 hours The aging damage of the paint causes the paint to lose its protective effect; the third is that the painting process is complicated and the coating dosage is large. Before painting, domestic similar products often need to apply a layer of primer on the concrete surface, and then paint 2~3 coats For protective coatings, the coating dosage is about 0.5Kg / m2~1.0Kg / m2; the fourth is poor environmental protection, and many of the existing domestic concrete protective coatings contain VOC , causing harm to the environment

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