Polyurethane foam with heat conductivity coefficient enhanced by hollow glass beads

Abstract

The invention discloses polyurethane foam with heat conductivity coefficient enhanced by hollow glass beads. The polyurethane foam is prepared from, by weight, 150-160 parts of diphenyl-methane-diisocyanate, 100-105 parts of propoxylated glycerin, 100-110 parts of castor oil, 5-6 parts of glycerol, 40-43 parts of diethyl phosphate, a proper 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, 4-5 parts of polyacrylamide, 3-4 parts of ethoxylated lauryl alcohol sulfate, 6-7 parts of hollow glass beads, 20-23 parts of cyclohexane, 0.2-0.22 part of n-propylamine, 0.6-0.7 part of silane coupling agent KH550 and a proper amount of deionized water. The prepared foam can be foamed on the spot, has the characteristics of being uniform in foaming, high in cell density and low in heat conductivity coefficient, is used for sealing of a switch cabinet, and is high in binding strength, good in sealing and excellent in heat preservation performance.

Description

technical field [0001] The invention relates to the technical field of styrofoam, in particular to a polyurethane styrofoam whose thermal conductivity is enhanced by hollow glass microspheres. 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 slo...

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.