Preparation method of molecular chain soft segment flame retardant polyurethane foam

Abstract

The invention provides a preparation method of molecular chain soft segment flame retardant polyurethane foam, and the molecular chain soft segment flame retardant polyurethane foam is prepared from the following components in parts by weight: 80-110 parts of polyhydric alcohol, 3-10 parts of a chain extender, 1-5 parts of a foaming agent, 1-6 parts of an amine catalyst, 0.1-1 part of a gel catalyst, 2-8 parts of a surfactant, 10-80 parts of a reaction type liquid molecule HEP and 60-130 parts of isocyanate. The prepared soft segment flame retardant polyurethane foam has excellent and long-lasting flame retardancy, is good in flexibility, can be used for preparing soft flame-retardant materials, and is especially used for preparing soft loading flame retardant materials in cabins of household appliances, product package, medical health, automobiles, rail transit, aircrafts and other transportation tools, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of flame-retardant materials, and in particular relates to a method for preparing flame-retardant polyurethane foam with a soft molecular chain segment. Background technique [0002] Polyurethane foam has the advantages of light weight, low thermal conductivity, and good dimensional stability for cushioning and shock absorption. Widely used in automotive interiors, home furnishing, product packaging and medical and health industries. However, while polyurethane foam brings safety to people, there are also some hidden dangers. Mainly because of its flammable characteristics, it poses a threat to people's life and safety. [0003] The molecular chain segments in polyurethane foam contain a large amount of carbon and hydrogen elements, which are prone to combustion. At the same time, its low-density and high-porosity structure will greatly accelerate heat loss and combustion speed. In addition, polyurethane foam will...

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Problems solved by technology

However, although the addition of flame retardants can give polyurethane foams long-lasting and excellent flame retardancy, it will also bring new problems to polyurethane foams. For example, expandable graphite as flame retardants can improve the flame retardancy of polyurethane foams. performance, but its compatibility with the matrix is ​​poor, and the addition of it will lead to deterioration of the mechanical properties of polyurethane foam, and the migration and shedding of flame retardants will occur, which will have a great negative effect on the application of polyurethane foam; in addition, traditional addition The introduction of flame retardants will increase the compressive strength of polyurethane foam, increase the brittleness of polyurethane foam, and limit its application in household, product packaging, medical and health care, etc.

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