Protective coating material for concrete bridge structure surface based on pure acrylic emulsion and preparation method thereof

Abstract

The invention relates to a concrete bridge structure surface protective coating material based on pure acrylic emulsion and a preparation method thereof. Most of the conventional concrete surface protective coatings are poor in carbonization resistance and ageing resistance and complex in brushing process steps. The concrete bridge structure surface protective coating material is prepared by mixing the following components together in parts by weight: 75 to 85 parts of pure acrylic emulsion, 1 to 3 parts of pure acrylic emulsion, 0.3 to 0.5 part of a water-based anti-aging agent, 1 to 3 parts of titanium pigment, 1 to 3 parts of sericite, 3 to 7 parts of a functional auxiliary agent system, 1.5 to 3.5 parts of a regulating auxiliary agent system, 0.5 to 2 parts of a leveling-type thickening agent and 5 to 10 parts of water, wherein the functional auxiliary agent system consists of a hydrophobing agent, a stain-resistant agent and an adhesive force accelerant in a mass ratio of 3:1:2; and the regulating auxiliary agent system consists of an antifoaming agent and a dispersant in a mass ratio of 1:6. By adopting the concrete bridge structure surface protective coating material, concrete achieves an excellent protection effect under an accelerated carbonization condition, the carbonization of the concrete is delayed, the ageing resistance of the concrete is excellent, the coating brushing process steps are simple, and all links from production to construction are safe and environment-friendly without environmental pollution.

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 pure acrylic 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) 2 The...

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Problems solved by technology

[0004] At present, the existing concrete surface protective coatings mainly have the following disadvantages: First, the anti-carbonation performance is poor, and the carbonation depth is generally greater than the specification requirement (the specification requirement is ≤1mm). The second is the poor anti-aging performance. The same kind of protective coatings in China will appear wrinkling, yellowing, cracking, powdering and other aging damage in about 800 hours, resulting in the loss of protective effect of the coating; the third is the painting process. It is complicated and has a large amount of coating. Before painting similar domestic products, it is often necessary to apply a layer of primer on the concrete surface, and then apply 2~3 protective coatings. The coating amount is about 0.5Kg / m 2 ~1.0Kg / m 2 ; The fourth is poor environmental protection. Many of the existing domestic concrete protective coatings contain VOC, which is harmful to the environment.

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