Halogen-free flame-retardant polyurethane sealant

Abstract

The invention discloses a halogen-free flame-retardant polyurethane sealant which are prepared from the following components in parts by weight: 50 to 60 parts of polyurethane resin, 6 to 12 parts ofstyrene-butadiene-styrene segmented copolymer, 2 to 5 parts of plasticizer, 30 to 50 parts of filler, 2 to 4 parts of castor oil, 2 to 8 parts of cross-linking agent, 1 to 10 parts of coupling agent,1 to 3 parts of polyethylene wax, 4 to 8 parts of flame retardant, 0.5 to 1.5 parts of zinc borate and 1 to 3 parts of ultraviolet absorbent. The flame retardant is prepared mainly from nanoscale Mg-Al hydrotalcite and polyaspartic acid by modification. The halogen-free flame-retardant polyurethane sealant not only has excellent flame retardance and has no pollution, but also has excellent adhesive property.

Description

technical field [0001] The invention belongs to the technical field of building sealing materials, and in particular relates to a halogen-free flame-retardant polyurethane sealant. Background technique [0002] The sealing material refers to the material that can withstand the displacement of the joint to achieve the purpose of airtightness and watertightness and is embedded in the joint of the building, called the sealing material. Seal materials include metal materials (aluminum, lead, indium, stainless steel, etc.), non-metallic materials (rubber, plastic, ceramics, graphite, etc.), composite materials (such as rubber-asbestos board, airgel felt-polyurethane), but The most used is rubber-like elastomer material. Polyurethane resin is widely used as a main sealing material raw material. However, due to the difficulty in processing polyurethane itself, the product quality is relatively average, and the bonding strength cannot meet the current use requirements, making the b...

AI Technical Summary

Problems solved by technology

The flame retardant efficiency of inorganic hydroxide flame retardants is low, and a large amount of addition is required to achieve the purpose of flame retardancy, which has a great impact on product performance; the problem of moisture absorption of red phosphorus flame retardants has a great impact on the final performance of the colloid. At the same time, there is a risk of explosion of red phosphorus when processing glue in a vacuum airtight environment; the types of polyphosphates include melamine polyphosphate, melamine pyrophosphate, etc. These flame retardants have low flame retardant efficiency in practical applications, and there are easy-to-dissolve problems

Although halogenated flame retardants have the characteristics of high flame retardant efficiency, due to the release of a large amount of toxic gases when they burn, there is a tendency to gradually limit their application in recent years.