Polyurethane foam gum with nickel and graphene for compositely enhancing electromagnetic shield effect

Abstract

The invention discloses a polyurethane foam gum with nickel and graphene for compositely enhancing electromagnetic shield effect, 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, 2-3 parts of octylphenol polyoxyethylene ether, 3-4 parts of organic silicone resin, 4-5 parts of graphene, 7-8 parts of anhydrous ethanol, 9-10 parts of a DMF solution, and 2-3 parts of nickel powder. The polyurethane foam gum can be foamed on site and can be uniformly adhered in grooves of a switch cabinet, thereby achieving excellent sealing performance. The polyurethane foam gum also has the effect of electromagnetic shield so as to avoid influence on devices in the cabinet due to electromagnetic wave, thereby prolonging service life.

Description

technical field [0001] The invention relates to the technical field of styrofoam, in particular to a polyurethane styrofoam compounded with nickel and graphene to enhance the electromagnetic shielding effect. 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-resilie...

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.