Epoxy pouring sealant as well as preparation method and application thereof to nuclear power equipment

Abstract

The invention relates to an epoxy pouring sealant as well as a preparation method and application thereof to nuclear power equipment. The epoxy pouring sealant comprises a main agent and a curing agent with a weight ratio of 1:(0.5-2); the main agent comprises the following raw materials in parts by weight: 60-100 parts of poly-functional epoxy resin, 10-35 parts of phenolic epoxy resin, 10-50 parts of toughened and modified epoxy resin, 10-30 parts of an active diluent, 5-25 parts of an active toughening agent, 60-100 parts of functional inorganic pigments and fillers and 1-10 parts of an auxiliary; the curing agent comprises the following raw materials in parts by weight: 100-200 parts by weight of an anhydride curing agent, 0.1-3 parts of a promoting agent, 100-200 parts of functional inorganic fillers, 5-40 parts of a flame retardant and 1-10 parts by of an auxiliary. The epoxy pouring sealant provided by the invention has the advantages of gamma irradiation resistance, high and low temperature impact resistance, good air tightness, insulation properties and mechanical properties, low shrinkage rate, long service life and the like. The epoxy pouring sealant can meet a special application environment in a nuclear power plant.

Description

technical field [0001] The invention relates to an epoxy potting glue and a preparation method thereof, in particular to an epoxy potting glue resistant to nuclear radiation and high temperature, and a preparation method and application thereof. Background technique [0002] Since nuclear power equipment has been in contact with harsh environments such as nuclear radiation, high and low temperature, and breakdown voltage for a long time, the sealing and insulating materials on the equipment are prone to aging and failure, which affects the service life of the equipment; Potting glue on nuclear power equipment such as fuel containers. [0003] The existing domestic epoxy potting adhesives have poor product flexibility and air tightness, and the product is brittle; or the glass transition temperature is low, the potting adhesive has high viscosity, poor fluidity and castability, and the fast curing speed leads to internal Many bubbles and other defects remain, and the domesti...

AI Technical Summary

Problems solved by technology

[0002] Since nuclear power equipment has been in contact with harsh environments such as nuclear radiation, high and low temperature, and breakdown voltage for a long time, the sealing and insulating materials on the equipment are prone to aging and failure, which affects the service life of the equipment; Potting glue on nuclear power equipment such as fuel containers

[0003] The existing domestic epoxy potting adhesives have poor product flexibility and air tightness, and the product is brittle; or the glass transition temperature is low, the potting adhesive has high viscosity, poor fluidity and castability, and the fast curing speed leads to internal A lot of bubbles and other defects remain, and the domestic nuclear radiation-resistant epoxy potting compound is still a technical blank

At present, the radiation-resistant and high-temperature-resistant epoxy potting adhesives used in nuclear power plants mainly rely on foreign customized products, which are expensive and will still have cracking defects after long-term use

Obviously, the traditional high temperature resistant epoxy potting adhesive has been difficult to meet the technical requirements of nuclear power equipment

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