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Method of manufacture of objects of a rigid material expands based on polyvinyl chloride, articles obtained by this process and their applications
Method of manufacture of objects of a rigid material expands based on polyvinyl chloride, articles obtained by this process and their applications
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机译:基于聚氯乙烯的硬质材料膨胀体的制造方法,通过该方法获得的制品及其应用
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摘要
A continuous process for making rigid PVC foam objects by extruding a preform from an initial PVC mixture, optionally cutting the preform into blanks, and expanding the preform or the blanks in water heated to a temperature above 70 DEG C. The initial mixture contains polyvinyl chloride, at least a first blowing agent capable of generating a gas, for example an isocyanate or a polyisocyanate, and at least one organic anhydride (and does not contain any added inert particles finely divided therein). The initial mixture may also contain less than one weight percent of a second blowing agent, for example azobisisobutyronitrile or azodicarbonamide. The objects produced possess heat- and sound-insulating properties.
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