Preparation method of expansible graphite modified high-flame-retardant rigid polyurethane foam

Abstract

The invention discloses a preparation method of expansible graphite modified high-flame-retardant rigid polyurethane foam. The preparation method includes the steps that firstly, white materials are prepared, wherein polyester polyol, polyether polyol, structural flame retardant polyether polyol, foam homogenizing agents, liquid fire retardant, fermentation catalysts, gel type catalysts, trimerization catalysts and water are evenly mixed, then graphite is added, foaming agents are added to the evenly mixed mixture, and the white materials are obtained; the prepared white materials are mixed with black materials according to the mass ratio of 1:1.5-1.8, the mixture is stirred and injected into a constant-temperature die for foam aging, and the rigid polyurethane foam is obtained, wherein the black materials are polyisocyanates. By means of the preparation method of the expansible graphite modified high-flame-retardant rigid polyurethane foam, the oxygen index of the rigid polyurethane foam is raised, the combustion performance can reach the non-combustible level, the mechanical strength and size stability are good, and the heat conductivity coefficient is low; compared with a similar product in the market, a great price advantage is achieved, and machining and forming are easy; the added fire retardant is free of volatility, not prone to being separated out, low in toxicity and durable in flame retardant effect.

Description

technical field [0001] The invention belongs to the field of cold-preservation materials for pipelines and storage tanks, and in particular relates to a preparation method of expandable graphite-modified high flame-retardant polyurethane rigid foam. Background technique [0002] Polyurethane rigid foam is a high-performance polymer composite material with low thermal conductivity, relatively light weight, good dimensional stability, high strength, waterproof, shockproof, solvent resistance and aging resistance and many other advantages. However, the material has poor flame retardancy and high temperature resistance, so its application in certain fields is limited. As the country has higher and higher requirements for the combustion performance of flame-retardant products and components in public places, polyurethane is facing more and more challenges in terms of fire resistance. Polyurethane rigid foam insulation materials with high flame resistance will be more and more pop...

AI Technical Summary

Problems solved by technology

However, the use of a large amount of flame retardants will affect the mechanical properties and foaming process of polyurethane rigid foam

In addition, after the oxygen index reaches 28, it is difficult to improve the flame retardant performance of polyurethane rigid foam.

And every time the oxygen index increases by one level, the cost will increase a lot. The polyurethane rigid foam with an oxygen index above 28 on the market is expensive.

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