Polyurethane foam gum with expandable graphite and diatomite to cooperatively enhance flame retarding

Abstract

The invention discloses polyurethane foam gum with expandable graphite and diatomite to cooperatively enhance flame retarding, which is prepared from, by weight, 150-160 parts of diphenyl methane diisocyanate, 100-105 parts of trihydroxy polyoxypropylene ether, 100-110 parts of castor oil, 5-6 parts of glycerol, 40-43 parts of diethyl phosphate, a proper amount of a 1 mol / L sodium hydroxide solution, 13-15 parts of diatomite, 5-6 parts of distilled water, 2-3 parts of triethanol amine, 3-4 parts of dibutyltin dilaurate, 3-4 parts of lauryl sodium sulfate, 5-6 parts of silicon oil, 3-4 parts of the expandable graphite, a proper amount of anhydrous ethanol, 0.8-1 part of cetyl trimethyl ammonium bromide, and a proper amount of deionized water. The foam gum is used for sealing switch cabinets and machine cabinets, is high in strength and is wear-resistant, can achieve on-site foaming and reduce production cost, has high total sealing performance, has simple and easy-to-control production process, and is safe and environment-friendly.

Description

Technical field [0001] The invention relates to the technical field of styrofoam, in particular to a polyurethane styrofoam reinforced with expandable graphite and diatomite in flame retardancy. Background technique [0002] Two-component polyurethane adhesives are the most important category of polyurethane adhesives, usually composed of component A (main agent) and component B (curing agent), where component A is a hydroxyl component and component B It is a component containing free isocyanate groups, and the two are packaged separately and can be formulated for use in a certain proportion. In my 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, high specific strength, etc. It can be made into ordinary soft foam, rigid foam, high resilience foam and slow resilience foam according to differ...

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.