Polyurethane composite polyether, polyurethane rigid foam and preparation method of polyurethane rigid foam

Abstract

The invention belongs to the technical field of polyurethane materials. In order to solve the problems that the polyurethane foam in the prior art has low flame retardancy, poor mechanical performance, large smoke amount, relatively low compression strength-density ratio, relatively low oxygen index-density ratio, relatively large smoke density, and the like, the invention provides polyurethane composite polyether, polyurethane rigid foam and a preparation method of the polyurethane rigid foam. The polyurethane composite polyether comprises a component A, and the component A comprises the following components in parts by weight: 30-70 parts of melamine polyol, 30-70 parts of phosphorus-containing polyester glycol, 10-20 parts of a smoke-suppression fire retardant, 10-25 parts of a physicalfoaming agent, 1-3 parts of a foam stabilizer, 1-2 parts of a chemical foaming agent and 2-5 parts of a catalyst. The polyurethane rigid foam comprises the component A and a component B, wherein thecomponent B is polymethylene polyphenyl polyisocyanate, the weight ratio of the component A to the component B is 1:(1.0-1.7). The polyurethane rigid foam also has the characteristics of high compressive strength-density ratio and high oxygen index-density ratio.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a polyurethane composite polyether, polyurethane rigid foam and a preparation method thereof. Background technique [0002] Polyurethane foam is a synthetic material with excellent performance. It has the advantages of high specific strength and small thermal conductivity. Driven by the national energy conservation and emission reduction policies, it has been widely used in building insulation and other fields. Polyurethane foam without flame retardant treatment has poor fire performance, and it is flammable and produces a lot of smoke when burned, which is often the main factor leading to casualties in fires. For this reason, it is often necessary to add a large amount of solid or liquid flame retardant materials to polyurethane foam in actual production. [0003] Solid flame retardant materials mainly include metal oxides such as Sb 2 o 3 etc., met...

AI Technical Summary

Problems solved by technology

Liquid flame retardant materials mainly include diethyl ethyl phosphonate, dimethyl propyl phosphonate, triethyl phosphate and tris(2-chloroisopropyl) phosphate, etc. In addition to the flame retardant performance, there are also disadvantages such as reducing the mechanical properties of the foam, increasing the amount of smoke generated when the foam burns, and significantly increasing the density of the core material of the foam. Specifically, it has a lower compressive strength density ratio and a lower oxygen index. Density ratio and greater smoke density

[0005] Therefore, a challenge that has always existed in the application of the existing polyurethane combination polyether and polyurethane rigid foam is how to meet lower thermal conductivity, lower smoke density, and lower feed density while improving flame retardancy , higher compressive strength density ratio and higher oxygen index density ratio and other parameters requirements

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