High-compression-resilience polyurethane foam adhesive for sealing

Abstract

The invention discloses a high-compression-resilience polyurethane foam adhesive for sealing. The polyurethane foam adhesive is prepared from the following raw materials in parts by weight: 150-160 parts of diphenylmethane diisocyanate, 100-105 parts of trihydroxy polyoxypropylene ether, 100-110 parts of castor oil, 5-6 parts of glycerol, 40-43 parts of diethyl phosphoric acid, a right amount of 1 mol / L sodium hydroxide solution, 13-15 parts of diatomite, 5-6 parts of distilled water, 2-3 parts of triethanolamine, 3-4 parts of dibutyltin dilaurate, 3-4 parts of fatty acid polyoxyethylene ester, 3-4 parts of silicone oil, 3-4 parts of lignite, 3-4 parts of melamine formaldehyde resin, 2-3 parts of n-octadecane, 1-1.5 parts of gelatin and a right amount of deionized water. The foam adhesive can be used for sealing switch cabinets and other cabinets by foam in place, and has the advantages of no seam, uniform elastomer inside bubble structure, favorable compression resilience and favorable sealing effect.

Description

technical field [0001] The invention relates to the technical field of styrofoam, in particular to a polyurethane styrofoam with good compression resilience and used for sealing. Background technique [0002] Two-component polyurethane adhesive is the most important type of polyurethane adhesive, usually composed of A component (main agent) and B component (curing agent), where A component is a hydroxyl component, B component For components containing free isocyanate groups, the two are packaged separately and can be formulated and used in a certain proportion. In our country, the research on foaming two-component polyurethane adhesives began in 1995 and was gradually put into use in the late 1990s. The foaming two-component polyurethane adhesive has the characteristics of porosity, low relative density, and high specific strength. According to different raw materials and formulas, it can be made into ordinary soft foam, hard foam, high-resilience foam and slow-rebound foam...

AI Technical Summary

Problems solved by technology

The traditional sealing process is to use the physical bonding method to bond the standard seal to the sealing position. This method has many defects such as low production efficiency, poor reliability, and unsightly appearance.

[0003] In the article "Preparation of Foaming Two-Component Polyurethane Adhesive", trihydroxypolyoxypropylene ether, castor oil and diphenylmethane diisocyanate are used as the main raw materials, glycerol is used as the chain extender, and water is used as the foaming agent. , through a suitable proportion, a foaming two-component polyurethane adhesive was synthesized by pre-polymerization method. The foamed adhesive foam was uniform and delicate, with high tensile and shear strength and excellent comprehensive performance. , but its heat resistance is poor and it is easy to burn. When it is used as the seal of a switch cabinet or a cabinet, it cannot meet the safety of use. This requires strengthening and modifying its thermal stability to improve its flame retardant performance.