Hard polyurethane foam plastic and producing method thereof

Abstract

The invention relates to a pyrex polyurethane foam plastic and the production method thereof. The raw materials are polyisocyanate, conjugate polyether and blowing catalyst, wherein the blowing catalyst consists of HFC-245fa, pentamethylene and nucleating agent; portions of raw materials by weight are: 100 portions of conjugate polyether, 1 to 10 portions of HFC-245fa, 6 to 12 portions of pentamethylene, 0.1 to 2.2 portions of nucleating agent, 100 to 130 portions of polyisocyanate. The steps of the production method are: a) the HFC-245fa, the pentamethylene and the nucleating agent are put into circularly transferring pump to mix with circularly; b) polyether glycol monomer, water, catalyst and stabilizer are mixed to prepare conjugate polyether; c) the mixture of the blowing catalyst and the nucleating agent and the conjugate polyether are fed into a static mixer; d) the mixture obtained from the step reacts with polyisocyanate that yields effervescence. The foam plastic of the invention has the advantages of environmental protection and low cost, and comprehensive properties thereof equivalent to the foaming ability of CEC-11. The invention opens up a novel shortcut for the application of HFC-245fa, erases the cost burden while is used alone, thus HEC-245fa can be largely popularized and used.

Description

technical field [0001] The invention relates to the technical field of foamed plastics, in particular to a rigid polyurethane foamed plastic and a production method thereof. Background technique [0002] Rigid polyurethane foam has good thermal insulation performance and certain strength, and is often used as the insulation layer of refrigerators and freezers. The preparation method of traditional PU (polyurethane) foam plastics is to take CFC-11 (3 chloro-fluoromethane) as blowing agent, the mixture POL (comprising polyhydric alcohol, water, catalyst, stabilizing agent, blowing agent) of combination polyether ) is mixed with organic polyisocyanate (MDI) under high pressure to form a foam with a cellular foam structure. [0003] CFC-11 is a PU foaming agent with excellent thermal insulation performance. The thermal conductivity (K value) is 0.0074W / m·K (same below 10°C), the foam core density is 28-32kg / m3, and the boiling point is 23.8°C. The thermal conductivity of rigid...

AI Technical Summary

Problems solved by technology

Although c-pentane is easy to obtain and cheap, it is flammable and explosive, and its thermal insulation is poor. The K value of its hard foam is about 0.020W / m·K, and the core density is usually 35kg / m 3 About; while HFC-245fa is safe and non-combustible, the K value of hard foam is about 0.019W / m·K, and the core density is 31kg / m 3 Or so, but the production process is complicated and the price is high, which affects its promotion. Nucleating agents (such as 3M's perfluorocarbon FA-188, etc.) can effectively reduce the K value of PU foam and improve thermal insulation performance, but it is expensive

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