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Process and Apparatus for the Production of Polyurethane Foam by Means of Liquid Carbon Dioxide as Foaming Agent
Process and Apparatus for the Production of Polyurethane Foam by Means of Liquid Carbon Dioxide as Foaming Agent
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机译:以液态二氧化碳为发泡剂生产聚氨酯泡沫的方法和设备
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摘要
In a process for adding a metered amount of carbon dioxide into a polyol flow at a pressure just above the equilibrium pressure for the dissolved gas, one or more metered polyol flows (P1, P2 and P3) are combined and a branch pipe (22) feeds part of the flow to a pump (23) which raises the polyol pressure to a suitable level for the addition of the carbon dioxide at a static mixer (24) and maintaining it in a fluid state in the polyol. The part flow then recombines with the main polyol flow and pressure is reduced to a level just above that at which the carbon dioxide vaporises and the polyol flow is mixed with an isocyanate (2). Also claimed are: (i) the production of polyurethane foam using liquid carbon dioxide as the blowing agent; and (ii) the apparatus for the above process, comprising a polyol branch pipe (22) with a pressure increasing pump (23), a carbon dioxide injecting system (25), a static mixer (24) and a by-pass pipe (21) for the main polyol flow, and a pressure holding valve (6) after the recombining point for the branch and main flows, which is followed by a foam component mixer (1) with a pressure relaxation valve (4) at the outlet.
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