超临界二氧化碳挤出发泡制备聚丁烯泡沫材料及性能  

Preparation and Properties of Polybutylene Foam Materials by Supercritical Carbon Dioxide Extrusion Foaming

作　　者：栾波 刘思彤 赖雄峰 冷栋梁 燕庆玲 李海艳 袁文博 LUAN Bo;LIU Sitong;LAI Xiongfeng;LENG Dongliang;YAN Qingling;LI Haiyan;YUAN Wenbo(Shandong Chambroad Petrochemicals Co.,Ltd.,Binzhou 256500,China;Shandong Chambroad Polyolefin Performance Material Co.,Ltd.,Binzhou 256500,China)

机构地区：[1]山东京博石油化工有限公司,山东滨州256500 [2]山东京博聚烯烃新材料有限公司,山东滨州256500

出　　处：《塑料工业》2024年第7期174-178,共5页China Plastics Industry

摘　　要：以超临界二氧化碳(sc-CO_(2))作为发泡剂,研究聚丁烯(PB)为发泡树脂的挤出发泡行为,考察发泡剂用量、口模温度及成核剂种类对发泡体系力学性能及泡孔结构的影响。采用扫描电子显微镜、万能实验拉力机、电子密度计对发泡材料的泡孔形态、泡孔尺寸、拉伸强度、密度进行测试。研究发现,当发泡剂用量由0.5 phr增加至4 phr时,样品密度先减小后增加,拉伸强度、泡孔密度逐渐减小,平均泡孔直径逐渐增大;当发泡剂用量为3 phr时,发泡倍率最大;当口模温度由130℃升高至140℃时,样品密度先减小后增加,拉伸强度逐渐减小,泡孔密度先升高后降低,平均泡孔直径逐渐增大,当口模温度为135℃时,发泡倍率及泡孔密度最高;分别采用滑石粉、碳酸钙、蒙脱土作为成核剂,当以滑石粉为成核剂时,聚丁烯发泡制品的泡孔尺寸均匀,泡孔密度可以达到1.37×10^(7)个/cm^(3)以上,发泡效果优于碳酸钙、蒙脱土两种成核剂。综上所述,聚丁烯发泡制品在口模温度为135℃、发泡剂用量为3 phr、成核剂为滑石粉时发泡效果最好。Using the supercritical carbon dioxide(sc-CO_(2))as the foaming agent,the extrusion foaming behaviors of polybutylene(PB)as the foaming resin were studied,and the effects of foaming agent dosage,die temperature and nucleating agent type on the mechanical properties and cell structures of foaming systems were investigated.Scanning electron microscope,universal experimental tension machine and electronic densimeter were used to test the cell morphologies,foam cell size,tensile strength and density of foaming materials.The results show that when the dosage of blowing agent increases from 0.5 phr to 4 phr,the sample density first decreases and then increases,the tensile strength and cell density gradually decrease,and the average foam cell diameter gradually increases.When the dosage of foaming agent is 3 phr,the foaming ratio is the largest.When the die temperature increases from 130℃to 140℃,the sample density first decreases and then increases,the tensile strength gradually decreases,the cell density first increases and then decreases,and the average cell diameter gradually increases.When the die temperature is 135℃,the foam ratio and cell density are the highest.Talc powder,calcium carbonate and montmorillonite were respectively used as the nucleating agents.When the talc powder is used as nucleating agent,the foam cell sizes of polybutylene foam products are uniform and the foam cell density could reach more than 1.37×10^(7)cells/cm^(3).The foaming effect of talc powder is better than that of calcium carbonate and montmoronite nucleating agents.In summary,the foaming effect of polybutylene foaming products is the best when the die temperature is 135℃,the dosage of foaming agent is 3 phr,and the nucleating agent is talc powder.

关 键 词：聚丁烯 挤出发泡 超临界二氧化碳 口模温度 成核剂 

分 类 号：TQ325.15[化学工程—合成树脂塑料工业]