Flame-retardant hard polyurethane foam material with expanded graphite in synergy with phosphorous-containing flame retardant, and preparation method thereof

Abstract

The invention relates to a flame-retardant hard polyurethane foam material with expanded graphite in synergy with phosphorous-containing flame retardant, made from, by weight, 100 parts of polyether polyol, 158-173 parts of isocyanate, 20-40 parts of DHDOPO (dihydroxy-containing DOPO), 15-25 parts of expanded graphite, 20-25 parts of a foaming agent, 2-5 parts of a foam stabilizer, and 1-1.5 parts of a catalyst; a preparation method of the flame-retardant hard polyurethane foam material with expanded graphite in synergy with phosphorous-containing flame retardant comprises the steps of preparing reactive flame retardant DHDOPO and preparing hard polyurethane foam. The invention has the advantages the phosphorus-containing flame retardant and the expanded graphite may cooperate to retard flaming, retarding effect is good, smoke production by combustion is low, and the retarding effect is permanent.

Description

technical field [0001] The invention belongs to the technical field of preparation of rigid polyurethane foam materials, and relates to a flame-retardant rigid polyurethane foam material in which expanded graphite cooperates with a phosphorus-containing flame retardant and a preparation method thereof. Background technique [0002] Polyurethane foams represent a wide variety of thermoset foaming materials with low thermal conductivity, excellent thermal insulation properties, high mechanical strength, strong adhesion and, most importantly, easy processing and shaping. Therefore, polyurethane foam is widely used in various fields, such as construction, oil pipeline, refrigeration and so on. However, the flame retardancy of polyurethane foam is poor, and its oxygen index (LOI) is only between 16-18vol%, and polyurethane foam releases a large amount of heat during combustion, and produces a large amount of toxic gases and smog such as CO and HCN , and reached the peak of combu...

AI Technical Summary

Problems solved by technology

However, expanded graphite cannot be flame retardant alone, especially when it exists in the form of solid particles. When used, it often leads to an increase in the viscosity of the raw material, which affects the foaming process of the material, and finally makes the distribution of expanded graphite in the matrix uneven.

At the same time, due to the small bonding force between the expanded graphite worm-like expanded carbon layer and the substrate, it is easy to fall off during the combustion process, thus limiting its use.

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