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水基压铸脱模剂的特点以及使用注意事项

更新时间:2019-01-16 19:01:53点击次数:760次

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金属压铸脱模剂千炮捕鱼从最初的油基脱模剂发展到水基脱模剂,再到目前新兴的粉状脱模剂经历了相当长的过程。期间,铸件的质量不断提高,脱模剂的环保性也在逐渐提高,应用越来越广泛。目前压铸生产中绝大多数用的是水基脱模剂。水基脱模剂具有脱模性好、冷却效果强、无污染、铸件表面光洁、少气孔、有利于自动化操作等优点。而油类脱模剂易产生油雾,不环保等原因逐步被淘汰。粉状脱模剂性能优异但是成本过高,国外主要将其应用于真空压铸,国内对其研究不多。本文主要关注水基压铸脱模剂的成分及其使用,具体阐述了其性能要求对压铸件成型的质量影响及市场现状。

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2水基压铸脱模剂的使用

水基脱模剂的脱模作用依赖于喷涂后沉积在型腔表面厚度只有微米级的薄膜。实践证明,脱模剂的浓度、模温、喷涂方法等都能直接影响压铸件的质量。在压铸生产中水基脱模剂的使用应注意以下几个事项。一是脱模剂的选择。目前行业上并未对脱模剂的理化性能有统一检测标准,市场上鱼龙混杂,一些压铸厂只能凭感觉和经验走。选用不当,则模具受损,压铸件废品增多,损失不小。因此,选用脱模剂应精选讲诚信,有品牌,有实力,有技术的供应厂商。二是脱模剂的稀释和喷涂量应适量。如果脱 模剂用水稀释过高或喷涂量过少,容易产生较薄皮膜及局部油膜断裂,压铸件有拉伤,粘模等现象:如果脱模剂用水稀释过低或喷涂时量过多,不但浪费脱模剂,而且造成脱模剂厚皮膜形成慢溶液堆积,压铸件表面形成皱纹,沉积等。三是探索最佳喷涂条件。当脱模剂通过喷嘴时,碰嘴对其雾化并施加一定喷射力。在最佳状态下,液滴与型腔表面接触面积大,有利于模具降温,对脱模剂的沉积也最为有利。所以要尽量对型腔表面进行垂直喷涂,综合考虑压力、喷涂距离及型腔温度等因素来获得最佳喷涂条件。

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