Efficient halogen-free anti-inflaming polyurethane hard foam and preparation method thereof

Abstract

The invention relates to efficient halogen-free anti-inflaming polyurethane hard foam and a preparation method thereof. The foam contains 40 to 50 % of polymer MDI, 30 to 40 % of polyether polyalcohol, 1 to 5 % of foam stabilizer, 0.1 to 5 % of foaming agent, 1 to 10 % of ternary cladding microencapsulation red phosphorus, 0 to 10 % of dimethyl methyl phosphonate (DMMP), 0 to 10 % of 2,4,6-triphosphoric diethyl ester-1,3,5-triazine (CNCTP), according to weight percentage. The preparation method comprises the steps of: proportionally and uniformly mixing the ternary cladding microencapsulation red phosphorus, the dimethyl methyl phosphonate (DMMP) or the 2,4,6-triphosphoric diethyl ester-1,3,5-triazine (CNCTP), the foam stabilizer, the foaming agent and the polyether polyalcohol at room temperature, rapidly mixing with polymer MDI, and then foaming. The invention has the advantages of small moisture absorption property, high anti-inflaming property, small influence on mechanical property, and the like.

Description

technical field [0001] The invention relates to a high-efficiency halogen-free flame-retardant polyurethane rigid foam and its preparation method, especially a new type of ternary coating microencapsulated red phosphorus and dimethyl methylphosphonate (DMMP), 2, 4, 6 -Diethyl triphosphate-1,3,5-triazine (CNCTP) synergistically prepares rigid polyurethane foam with high-efficiency flame-retardant properties, and its molecular structure formula is CNCTP. technical background [0002] Polyurethane rigid foam is a polymer composite material with superior performance, which has the characteristics of low density, high strength, low thermal conductivity, strong adhesion, and convenient construction. It can be used not only as thermal insulation material, but also as structural load-bearing material, widely used in construction, transportation, refrigerators, freezers, petrochemical pipelines, aviation and military, etc. With the continuous expansion of the application range of po...

AI Technical Summary

Problems solved by technology

As the substance with the highest phosphorus content, red phosphorus has good flame retardant properties and has received widespread attention due to its small amount of addition. However, it easily absorbs moisture in humid air and forms toxic gases such as PH3, which affects the storage and use of red phosphorus. Therefore, it is often coated and modified, and binary coating is commonly used, which can reduce the release of toxic gases, reduce moisture absorption and increase compatibility with the matrix, but the flame retardant efficiency is affected to a certain extent.