抗冲改性聚氯乙烯(PVC-M)给水管材管件中锡的测定与分析  

Determination and analysis of tin in impact modified polyvinyl chloride(PVC-M)water supply pipes and fittings

作　　者：章丽丽 刘慧敏 沈鑫宇 Zhang Lili;Liu Huimin;Shen Xinyu(Jiangsu Chengxin Test and Certification Co.LTD.,Jiangyin 214434,Jiangsu,China)

机构地区：[1]江苏澄信检验检测认证股份有限公司,江苏江阴214434

出　　处：《橡塑技术与装备》2025年第5期53-56,共4页China Rubber/Plastics Technology and Equipment

摘　　要：采用微波消解法对PVC-M给水管材管件及其原料进行处理,采用浸泡法和超声波法对PVC-M给水管材管件进行浸泡,用氢化物原子荧光法测定原料中的锡含量及浸泡液中的锡迁移量。PVC-M管材、管件中锡含量超过100 mg/kg,相应的人造自来水浸泡液中锡迁移量也超过标准限值0.002 mg/L。原料PVC树脂粉、抗冲加工改性剂MBS、填充剂、着色剂中锡含量较低,锡主要来自于添加的钙锌复合稳定剂和有机锡热稳定剂。为了避免锡对环境和人体健康造成威胁,涉水PVC-M管件管材生产企业应使用无毒无害的热稳定剂,确保生产出来的PVC-M给水管材管件符合《生活饮用水输配水设备及防护材料卫生安全评价规范》(2001)要求。This study used microwave digestion method to treat PVC-M water supply pipes,fittings and their raw materials,and conducted immersion experiments on PVC-M water supply pipes and fittings using immersion method and ultrasonic method.Determine the tin content in the raw material and the tin migration amount in the soaking solution by hydride atomic fluorescence method.The results showed that the tin content in PVC-M pipes and fittings exceeded 100 mg/kg,and the corresponding tin migration in the artificial tap water immersion solution also exceeded the standard limit of 0.002 mg/L.After analysis,the tin content in the PVC resin powder,impact processing modifier MBS,filler,and coloring agent in the raw materials is relatively low.Tin mainly comes from the added calcium zinc composite stabilizer and organic tin heat stabilizer.To avoid the threat of tin to the environment and human health,it is recommended that water related PVC-M pipe manufacturers use non-toxic and harmless heat stabilizers to ensure that their products comply with the relevant requirements of the Hygienic and Safety Evaluation Specification for Drinking Wate r Transmission and Distribution Equipment and Protective Materials(2001).

关 键 词：给水用抗冲改性聚氯乙烯(PVC-M) 给水管材管件 热稳定剂 氢化物原子荧光法 锡 

分 类 号：TQ320.772[化学工程—合成树脂塑料工业]