Halogen-free low-smoke flame-retardant type hard polyurethane foam material and preparation method thereof

Abstract

The invention relates to the technical field of preparing a hard polyurethane foam material, and particularly relates to a halogen-free low-smoke flame-retardant type hard polyurethane foam material and a preparation method thereof. The hard polyurethane foam material comprises the following components in parts by weight: 100 parts of polyether polyol, 50-70 parts of ammonium polyphosphate, 2-10 parts of zinc hydroxystannate, 20-25 parts of foaming agent, 2-5 parts of foam stabilizer, 1.1-1.5 parts of catalyst, 1.1-1.5 parts of water and 130-150 parts of isocyanate. By adopting the technical scheme in which ammonium polypolyphosphate, zinc hydroxystannate and polyether polyol are ground and dispersed in a planet ball mill in advance, the dispersion stability of ammonium polyphosphate in polyether can be effectively enhanced, the obtained combined white material cannot layer within one week, a powder flame retardant can be evenly dispersed in polyether, without settling or coagulating, and the prepared hard polyurethane foam does not collaps in structure at high temperature, incapable of melting, and small in the quantity of generated smoke.

Description

technical field [0001] The invention relates to the technical field of preparation of rigid polyurethane foam materials, in particular to a halogen-free, low-smoke, flame-retardant rigid polyurethane foam material and a preparation method thereof. Background technique [0002] Rigid polyurethane foam is a kind of thermal insulation material and structural material with excellent performance. Its biggest advantages are light weight, good thermal insulation performance, strong adhesion with other materials, high compressive strength and good dimensional stability. It can be widely used in fields that require thermal insulation. However, the rigid polyurethane foam prepared by the prior art has the problems of flammability, easy melting and dripping when burning, releasing toxic gases such as HCN and CO, and low oxygen index, which limits its application in refrigeration, Heating insulation and other building materials used in the field. The national standard GB8624-2012 "Cla...

AI Technical Summary

Problems solved by technology

However, ammonium polyphosphate has poor compatibility with polyols and is easy to settle, which affects the stability of polyether composite materials, so the application of APP in the polyurethane foam industry is limited.

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