Normal pentane foamed rigid polyurethane foam combined polyether for refrigerator

Abstract

The invention belongs to the technical field of polyurethane foam and particularly relates to a normal pentane (n-pentane) foamed rigid polyurethane foam combined polyether for a refrigerator, comprising the following raw materials in parts by weight: 100 parts of polyether polyol, 0.1-0.5 parts of catalyst I, 0.5-1.5 parts of catalyst II, 1.0-1.5 parts of catalyst III, 0.5-0.8 part of catalyst IV, 1.5-2.5 parts of silicone oil, 1.5-2.5 parts of water and 10-15 parts of n-pentane, wherein the polyether glycol comprises two or more than two polyalcohols. By adopting the combined polyether disclosed by the invention, the foam can be prepared at a normal temperature and a normal pressure; the process is simple and easy to operate; the foam performance can meet the use requirements; and the combined polyether has the advantages of zero ODP (ozone depletion potential) and low GWP (global warming pPotential) and belongs to environment-friendly products.

Description

technical field [0001] The invention belongs to the technical field of polyurethane foam, and in particular relates to a combination polyether of polyurethane rigid foam foamed by n-pentane used in refrigerators. Background technique [0002] Polyurethane foam is a foam product made of polyether polyol and isocyanate under the action of a blowing agent. It has excellent thermal insulation properties, mechanical properties, electrical properties, acoustic properties and chemical resistance, especially excellent thermal insulation properties. And widely used in refrigerators, freezers, water heaters, cold storage panels, sandwich panels, pipeline insulation, refrigerated containers, and other thermal insulation fields. In the production process of polyurethane rigid foam, the currently commonly used alkane blowing agents are mainly cyclopentane and isopentane. The two blowing agents have their own disadvantages: when cyclopentane is used, the safety of the blowing agent shoul...

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Problems solved by technology

The two blowing agents have their own disadvantages: when cyclopentane is used, the safety of the blowing agent should be considered, and the foam density prepared at the same time is relatively high, and the thermal insulation performance of the foam is slightly poor; when using isopentane to prepare foam, It should be considered that the solubility of isopentane in the combined polyether is poor, and there are high requirements for the polyether polyol used in the combined polyether; on the other hand, in order to reduce the foam cost and improve the low thermal conductivity of the foam, the ring The technology of mixing pentane and HFC-245fa as blowing agent has been reported, but no mention of foam formulation technology

Simultaneously above-mentioned existing alkane foaming technology also has the problem of following generality: because the boiling range of foaming agent is less, can be subjected to the influence of environmental conditions during foaming, as geographical environment, weather condition (humidity), influence foam Diffusion or foaming also affects the operability of foaming, and the foam density of the finished product is high, and the production cost is high

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