Rigid cellular plastic with improved property and preparation method thereof

Abstract

The invention relates to a polyurethane rigid cellular plastic with improved property, which is prepared by the raw materials that are fully mixed in a high pressure foaming machine for reaction according to the ratio of parts by weight: composite polyether:mixed foaming agent:isocyanate = 100:7-27:110-150. The composite polyether is prepared by the components according to the ratio of parts by weight: composite polylols:foam stabilizer:catalyst:water:emulsifying agent= 100:1.0-4.0:0.5-5.0:0.5-3.5:0.5-10, wherein, the composite polylols comprise two or more polylols. Compared with cyclopentane foam and hydroflurocarbon foam, the heat conductivity coefficient of the foam prepared by the invention is obviously reduced; in the process of reaction between isocyanate and composite material, wider operating range can be obtained. The sensibility of the reaction towards parameters such as materials, mould, condition of circumstance and the like can be reduced.

Description

technical field [0001] The invention relates to a performance-improved rigid polyurethane foam and a preparation method thereof, belonging to the field of polymer chemical materials. 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. It is widely used in insulation and insulation fields such as refrigerators, freezers, cold storage panels, sandwich panels, pipeline insulation, refrigerated containers, and building energy conservation. In the production process of polyurethane rigid foam, currently commonly used blowing agents are mainly cyclopentane, HFC-245fa and HFC-365mfc. The three foaming agents have their own advantages and disadvantages: when cyclopentane is used, the density of the prepar...

AI Technical Summary

Problems solved by technology

The three foaming agents have their own advantages and disadvantages: when cyclopentane is used, the density of the prepared foam is relatively high, and the thermal insulation performance of the foam is slightly poor; The raw material prices of -245fa and HFC-365mfc are relatively high, and the cost of the prepared foam increases significantly

On the other hand, in order to reduce the foam cost and improve the low thermal conductivity of the foam, the technology of using cyclopentane and HFC-245fa as a mixed 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 foaming agent is small, it will be greatly affected by the environmental conditions when foaming

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