Water-based epoxy protective coating system for nuclear power station concrete and preparation method of water-based epoxy protective coating system

Abstract

The invention relates to a water-based epoxy protective coating system for nuclear power station concrete, the water-based epoxy protective coating system is composed of water-based epoxy repair mortar, water-based epoxy putty and water-based epoxy finish paint; the water-based epoxy repair mortar is composed of a component A1, a component B1 and a component C according to a mass ratio of (0.1-0.2): 0.15: 1; the water-based epoxy putty is composed of a component A2 and a component B2 in a mass ratio of (1.5-2): 1; the water-based epoxy finish paint is composed of a component A3 and a component B1 in a mass ratio of (3-5): 1; the component A1 comprises 40-100% of a waterborne epoxy curing agent and the balance of deionized water; the component B1 comprises 60-100% of water-borne epoxy resin and the balance of deionized water; and the component C consists of 20-60% of Portland cement, 40-80% of sand and 0.1-3% of an auxiliary agent. The invention also provides a preparation method of the water-based epoxy protective coating system for the nuclear power station concrete.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a water-based epoxy protective coating system for nuclear power plant concrete and a preparation method thereof. Background technique [0002] With the increase of the power generation of nuclear power plants in my country, the radiation intensity is also increasing. The surface of the concrete structure in the nuclear power plant must be coated with protective coatings that are resistant to radiation and have stronger decontamination capabilities in order to provide a layer of protection for the microporous concrete surface. barrier to prevent radioactive substances from infiltrating into it and becoming an irremovable radioactive source, causing harm to the health of operating personnel; in addition, in the containment area of ​​the nuclear island, in addition to the above performance requirements, protective coatings also need to pass through damp heat and post-irradiation. S...

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Problems solved by technology

The coating is currently applied on the concrete surface of the containment shell of nuclear power plants. This coating can meet the design requirements of concrete coating materials for nuclear power plants. , which may lead to cracking of the coating; COSCO Kansai Paint Chemicals (Tianjin) Co., Ltd. discloses a special water-based epoxy coating for nuclear power plants and its preparation method (application number 201010616383.7), which is used on the concrete surface of the nuclear island area of ​​the nuclear power plant , it uses a single commercially available base material, and its coating performance is easily limited by the performance of the base material; in addition, in order to improve the decontamination rate of the coating, a part of silicon-containing additives is selected in the coating formula, so that although the decontamination rate It has been improved, but it has a certain impact on the adhesion between the coatings and the supporting performance of the coating system; Guangzhou Xiubo Chemical Co., Ltd. discloses a radiation-resistant coating for nuclear power plants and a preparation method thereof (application number 200810026300.1), It belongs to solvent-free epoxy coatings. Although it overcomes the harm caused by solvent volatilization, the inherent shortcomings of solvent-free epoxy coatings are: brittle coating film, poor impact resistance; short service life, which brings inconvenience to operation; The viscosity is high, the construction is inconvenient, and even specific construction tools are required. Therefore, its promotion and application have certain limitations.

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