Expansion-type fireproof paint used for lost foam

Abstract

The invention discloses an expansion-type fireproof paint used for lost foam, which comprises the following components by weight: 35-45 parts of composite resin, 8-12 parts of n-butyl acetate, 6-9 parts of ammonium polyphosphate, 4-6 parts of chlorinated terphenyls, 3-5 parts of glass wool, 0.6-0.8 parts of potassium ammonium polyphosphate, 2-4 parts of nano-sized magnesium hydroxide, 1.2-1.5 parts of charring agent, 3-5 parts of hydroxyethyl cellulose and 0.5-0.7 parts of sodium fluosilicate. The composite resin prepared by the components with specific proportion can effectively increase the fireproof limitation, compared with a single resin, the fireproof time is increased by 6-8 minutes; the prepared paint has excellent stability can be used for coating on the surface of the lost foam, expandable graphite and nano-sized magnesium hydroxide in the components have cooperation flame retardation effect, and can bear the high/low temperature cycle influence.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to an intumescent fireproof coating for lost foam. technical background [0002] Traditional casting coatings only play a barrier role between castings and molds to prevent sand sticking. However, ordinary casting coatings are prone to sand sticking due to poor adhesion, low strength, poor fire resistance, and large gas generation at high temperatures. , Trachoma, porosity, carbon residue and other defects. Sand sticking in castings is because the coating does not effectively block and isolate, or the chemical reaction between the coating and the high-temperature metal liquid occurs. Poor paint adhesion is mainly manifested in the fact that the paint peels off during sand filling and vibration, causing sand sticking to castings; the large expansion coefficient of paint is manifested in the fact that when the paint is in contact with high-temperature metal liquid, the h...

AI Technical Summary

Problems solved by technology

The high-temperature liquid metal is oxidized and chemically reacts with the coating and the casting mold to form metal oxides, which have strong adhesion to the coating and molding sand, and can firmly adhere the molding sand to the surface of the casting to form a series of low-melting compounds, resulting in Casting sticky sand, sometimes although no sticky sand is produced, a layer of paint that is difficult to remove adheres to the surface of the casting, and sticky dust is produced