Nano composite foaming agent for preparing polyurethane and preparation method thereof

Abstract

The invention discloses a nano composite foaming agent for preparing polyurethane, and particularly relates to the technical field of foaming agents, and the nano composite foaming agent comprises the following raw materials: 4, 4-oxo-bis (benzenesulfonyl) hydrazine, modified nano silicon dioxide and layered montmorillonite. The mesoporous silica is subjected to polymer grafting reaction after pore expansion treatment, so that the mesoporous silica has super-large mesoporous channels, the mesoporous silica has excellent dispersity and good interfacial compatibility, and then n-octyl alcohol is added to modify the mesoporous silica and acetone. The nano composite foaming agent can be more uniformly dispersed into polyurethane to reduce the local foaming agent amount, and the nano composite foaming agent provided by the invention not only has small particle size, but also has high loading capacity on a chemical foaming agent, so that microporous foamed plastic with better foaming quality can be obtained.

Description

technical field [0001] The invention relates to the technical field of foaming agents, more specifically, the invention relates to a nanocomposite foaming agent for preparing polyurethane and a preparation method thereof. Background technique [0002] In the field of polymer technology, polyurethane foam is currently the most commonly used polymer thermal insulation material. It has many advantages such as light weight, high strength, and thermal conductivity. It has been widely used in building energy-saving materials, automotive interiors, refrigeration insulation materials, Freezers and other specific areas. An important parameter to measure the excellent thermal insulation performance of polyurethane foam is the thermal conductivity. The heat conduction of polyurethane foam mainly depends on three ways: gas phase conduction in the cell, solid phase conduction in the foam body and heat radiation. When the temperature is low, the thermal radiation heat transfer is extrem...

AI Technical Summary

Problems solved by technology

[0004] However, the existing foaming agent for polyurethane has a large particle size and uneven distribution, which causes local overheating, is difficult to control the cell size, and greatly reduces foaming efficiency and quality, thus limiting its application in microcellular foam plastics.