Fire retardant coating for steel structure surface of nuclear power plant

Abstract

The invention relates to a fire retardant coating for a steel structure surface of a nuclear power plant. The fire retardant coating consists of components A, B and C at a weight ratio of (4-6): 1: 1, wherein the component A is a mixture composed of 15-35 parts of epoxy resin, 2-10 parts of reactive diluent, 5-15 parts of dehydration catalyst, 10-30 parts of carbonizing agent, 5-20 parts of foaming agent, 15-35 parts of fire retardant, 5-15 parts of smoke inhibitor, 10-30 parts of pigment and filler and 2-10 parts of auxiliaries; the component B is a mixture composed of 10-50 parts of toughened resin, 10-30 parts of pigment and filler and 2-10 parts of auxiliaries; the C component is an amine curing agent; and the toughened resin in the component B is hyper-branched polyester resin with a terminal carboxyl group. The fire retardant coating disclosed by the invention is more excellent than a normal intumescence fire retardant coating in binding strength, freezing and thawing cycle resistance, acid and base resistance, and fire retardant limit, and is specifically up to fire resistance requirements of the steel structure surface of the nuclear power plant.

Description

technical field [0001] The invention relates to a fireproof coating on the surface of a nuclear power plant steel structure. Background technique [0002] The construction of nuclear power plants has entered a broad development space in recent years. The surface coating of steel structures in nuclear power plants not only needs to have radiation resistance and medium resistance, but also requires good fire resistance. Due to the non-combustibility of the steel structure itself, the fire protection and heat insulation protection of the steel structure is often ignored. The steel material generally only has a fire resistance limit of 15 minutes under direct burning by a high-temperature flame, and will quickly lose its bearing capacity. Under the action of temperature in a fire, the strength of a steel structure is a function of temperature. When the temperature of the structure reaches 300, 500, and 600°C, its strength decreases by 1 / 3, 1 / 2, and 2 / 3 respectively, and the mec...

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Problems solved by technology

However, most intumescent fireproof coatings use acrylic resin or water-based resin as the film-forming material, which has poor chemical corrosion resistance, water resistance, and solvent resistance. The flame retardant is easy to migrate out of the coating, causing the coating to lose its original function. However, the fireproof coating with epoxy resin as the film former often affects the fireproof effect due to the brittleness of epoxy resin.

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