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常见问题

PVC粘合剂常见品质异常及原因

作者:奥凯高分子  发布时间:2017-07-27 15:05  点击量:
  一、粘合剂过浓或过稀:
 
  PVC粘合剂中的固体成分比例偏低时,会出现粘合剂粘度值偏低,表现为粘合剂过稀,涂到管材上容易滴落。相反,则会出现粘合剂过浓,不好涂开、涂均匀。
 
  粘合剂不粘:
 
  二、当客户反映 PVC粘合剂不粘时,有以下可能原因:
 
  粘合剂本身粘结强度不够:原料或配方问题,影响整体的粘结效果;
 
  所粘雷电竞app下载的材质存在异常:管材/管件雷电竞app下载的组成成分中,可能由于碳酸钙含量偏高,导致PVC含量过低,胶水对其表面溶解不足,就会出现粘不紧;
 
  管材/管件的粘合面间隙过大/配合过松:涂粘合剂后两雷电竞app下载粘合面过小,粘合剂对其表面溶解不足,就会出现粘不紧;
 
  涂胶施工时操作方法不当而导致粘不紧,具体可参考《红叶牌胶黏剂使用方法》。
 
  三、粘合剂呈果冻状:
 
  当粘合剂中的固含量过高,或者温度下降时,粘合剂的流动性会下降,下降到一定的程度,就出现粘合剂呈果冻状,影响正常涂胶施工。
 
  当温度上升或溶剂含量增加,凝胶现象会缓解甚至消除。
 
  四、粘合剂发黄:
 
  一般情况下,我司生产的PVC粘合剂均为无色透明状的。但由于我司所有粘合剂都是采用铁罐装的,当铁罐表层的镀层失效后,带酸性的溶剂就会对铁罐存在一定的腐蚀作用,从而导致粘合剂带上轻微的黄色;
 
  我司粘合剂的溶剂中,只有二氯乙烷会带轻微的酸性,因此存放时间较长的新B级胶水确实会出现变黄的现象(一般5-6个月后),而给水、A级、B级胶水则能保持较高的透明度。
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