Waterproof paint and preparation method thereof

Abstract

The invention provides a waterproof paint, which comprises a composition A and a composition B, wherein the composition A comprises the following components in percentage by weight: 35 to 55 percent of methyl methacrylate resin, 0.5 to 1.5 percent of photosensitizer, 2 to 4.5 percent of accelerating agent, 18 to 35 percent of butyl methacrylate, 3 to 9 percent of butyl acrylate and 15 to 35 percent of silicon micro powder; the composition B comprises the following components in percentage by weight: 25 to 45 percent of methyl methacrylate resin, 0.7 to 2 percent of light stabilizer, 3 to 5 percent of initiator, 20 to 45 percent of methyl methacrylate resin, 5 to 15 percent of butyl acrylate, 10 to 30 percent of silicon micro powder and 0.4 to 1.2 percent of paraffin; and the weight ratio of the composition A to the composition B is 1:1-1:1.5. A waterproof layer formed by the waterproof paint has strong adhesive force, good flexibility, high strength and excellent thermostability, and can be exposed outdoors for long term, and has strong weather resistance and good waterproofness.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a waterproof coating and a preparation method thereof. Background technique [0002] In recent years, railway passenger dedicated lines, high-speed railways, intercity rail and other line projects have developed rapidly. Most of these lines are concrete bridges with a long design life. quite high. Especially for intercity tracks, in order to reduce the weight of concrete bridges, the waterproof layer of the concrete bridge deck no longer uses a concrete protective layer, so that the waterproof layer of the bridge deck will be directly exposed to the outdoors for a long time. Therefore, in addition to meeting the basic mechanical properties of the waterproof layer , has extremely high requirements on weather resistance. [0003] The waterproof layer is generally formed by spraying waterproof paint. The weather resistance of waterproof paint refers to the ability of the paint to withstand...

AI Technical Summary

Problems solved by technology

The tensile strength of polyurethane waterproof coating can reach more than 6MPa, and the elongation at break can reach more than 450%, but the weather resistance is very poor, and the surface of the waterproof layer formed after spraying must be covered with a concrete protective layer, while the waterproofing of the concrete bridge deck Adding a concrete protective layer on the surface of the layer is not conducive to reducing the self-weight of the concrete bridge

The tensile strength of polyurea elastomer waterproof coating can reach more than 16MPa, and the elongation at break can reach more than 450%, but the weather resistance is also very poor. Under long-term outdoor exposure, the waterproof layer formed by spraying is easy to pulverize, which affects waterproofing In order to ensure the waterproof performance of the layer, it is usually necessary to spray a layer of aliphatic polyurethane surface layer with better weather resistance on its surface, which not only increases the cost, but also complicates the construction process.