短语词组短语polyvinyl butyral modified resin 聚乙烯醇缩丁醛改性树脂butyral l resin 丁缩醛树脂Polyvinyl Butyral Resin 聚乙烯醇缩丁醛树脂;烯醇缩丁醛 返回 butyral resin