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METHOD FOR MANUFACTURING ARTICLES COMPRISING EXPANDED RIGID MATERIAL BASED ON VINYL POLYCHLORIDE, OBJECTS OBTAINED BY THIS PROCESS AND THEIR APPLICATIONS
METHOD FOR MANUFACTURING ARTICLES COMPRISING EXPANDED RIGID MATERIAL BASED ON VINYL POLYCHLORIDE, OBJECTS OBTAINED BY THIS PROCESS AND THEIR APPLICATIONS
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机译:基于聚氯乙烯的膨胀硬质材料制品的制造方法,所获得的对象及其应用
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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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