Polyurethane rigid foam composite polyether

Abstract

The invention relates to polyurethane rigid foam composite polyether and belongs to the technical field of polyurethane foam plastic. The polyurethane rigid foam composite polyether consists of the following raw materials in part by weight: 100 parts of polyether polyol, 0.1 to 0.5 part of catalyst I, 0.5 to 1.5 parts of catalyst II, 1.0 to 1.5 parts of catalyst III, 0.5 to 0.8 part of catalyst IV, 1.5 to 2.5 parts of silicone oil, 1.5 to 2.5 parts of water and 15 to 20 parts of mixture consisting of cyclopentane and 365mfc / 227, wherein the polyether polyol adopts four kinds of different polyols. The heat conductivity coefficient of foam prepared from the composite polyether and isocyanate is obviously lower than that of cyclopentane foam. In the reaction process of the isocyanate and the composite material, a wider operating range can be achieved. Sensitivity of parameters such as the reaction materials, moulds, environmental conditions and the like is reduced.

Description

technical field [0001] The invention belongs to the technical field of polyurethane foam plastics, in particular to a combination polyether of cyclopentane and HFC-365mfc / 227 co-foaming polyurethane rigid foam. 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 commonly used blowing agents are mainly cyclopentane and HFC-365mfc. The two blowing agents have their own advantages and disadvantages: when cyclopentane is used, it can provide a better comprehensive bal...

AI Technical Summary

Problems solved by technology

The two blowing agents have their own advantages and disadvantages: when cyclopentane is used, it can provide a better comprehensive balance in terms of boiling point and gas phase thermal conductivity, the price is relatively low, zero ODP, and GWP are negligible, but the blowing agent is safe Poor, at the same time the prepared foam density is higher, and the thermal insulation performance of the foam is slightly worse; when the foam is prepared by HFC-365mfc, the prepared foam has high compressive strength, high dimensional stability, low core density, and high thermal insulation performance. However, there is a flash point problem, and the safety performance of the foaming agent is not good, so HFC-365mfc (1,1,1,3,3-pentafluorobutane) and HFC-227 (1,1,1,2,3 , 3,3-heptafluoropropane) mixture (no flash point), there is currently a mixed blowing agent HFC-365mfc / 227 (weight ratio: 365mfc: 365mfc: 227=87:13)

[0003] In order to reduce the cost of foam and improve the low thermal conductivity of foam, the technology of mixing cyclopentane and HFC-245fa as blowing agent has been reported, but there is no mention of foam formulation technology

Simultaneously, the above-mentioned prior art also has the following common problems: because the boiling range of the blowing agent is small, it will be greatly affected by the environmental conditions when foaming

Images