芯棒旋转式口模挤出玻纤增强聚丙烯管的研究  

GFRPP PIPES PREPARED BY MANDRELROTATING EXTRUSION

作　　者：蒋龙[1] 申开智[1] 

机构地区：[1]四川联合大学塑料工程系

出　　处：《高分子材料科学与工程》1998年第3期133-134,137,共3页Polymer Materials Science & Engineering

基　　金：国家自然科学基金

摘　　要：利用旋转芯棒口模成功地挤出了玻纤增强聚丙烯管。扫描电镜研究发现该玻纤管中玻纤沿管周向大量取向，并且取向程度由内壁到外壁逐渐降低。强度测试表明该玻纤管的周向强度由普通挤出的８４ＭＰａ提高到现在的１３５ＭＰａ。由于玻纤的周向取向，挤出管材的出模膨胀及周向热膨胀率皆有所降低。A die with rotatable mandrel was designed. The mandrel rotated during extruding glass fiber reinforced polypropylene pipes. The orientation of the glass fibers in GFRPP pipes has been studied. Under the shearing stress of rotating mandrel and the inner surface of female die, the orientation of glass fibers has a angle gradient across the pipe wall. The tensile strength in the hoop direction increases from 84 MPa to 135 MPa with the increase of mandrel rotating speed. Owning to the obstruction of oriented glass fibers, thermal expansion ratio and die swell decrease in hoop direction.

关 键 词：芯棒 旋转式口模 聚丙烯 玻璃钢 增强塑料 管材 

分 类 号：TQ327.110[化学工程—合成树脂塑料工业]