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哪些因素會影響拉伸膜的粘度

作者：兴亚閱讀量：发布日期：2022/7/18 16:29:14

信息摘要：

哪些因素會影響拉伸膜粘度，讓我們一起來分析一下。

1、分子量對粘度的影響：

分子量不同,粘合性能不同,高分子量PIB使纏繞膜具有較高的剝離粘合力,但隨著PIB分子量的增加,搭接粘合力會減弱；如果分子量太低,則容易揮發,導致粘度保持時間太短。因此,增加PIB分子量可以使拉伸纏繞膜具有良好的粘合力。

2、添加量對粘度的影響：

拉伸膜的粘度與加入的PIB量相關。然而,在PIB的添加越過3％後,拉伸膜的自粘性的增加變得不顯明。如果PIB的添加量不斷增加,則PIB會在拉伸膜表面沈澱,導致拉伸膜的自粘性不均勻,乃至拉伸膜卷也很難打開。爲了拉伸膜的性能,並考慮到原材料的成本,PIB的量應控制在1％至3％之間。PIB具有滲出過程,並且通常需要約三天來包裹膜表面以産生粘度。

3、拉伸纏繞膜的儲存溫度對粘度的影響：

PIB的迁移速度与存储温度有关。环境温度升高,PIB迁移率增加,粘度增加。因此,拉伸膜要符合所需的粘度,应贮存在较高的温度下,一般放置一周后就可符合使用要求。但是,在30°C以上的环境中长期保存,PIB会出现大量沉淀,容易产生拉伸膜尺寸或纸芯出现粘连的现象,因此符合粘度要求后,应放在 -15°C-40°C环境储存。

PIB是一种粘性液体物质。当PIB与聚乙烯共挤时,材料不能平滑地挤出设备。为了便于生产,已经开发出用于生产聚乙烯 -拉伸缠绕膜的高浓度PIB增稠母料。该母料是以预定比例混合PIB和聚乙烯制成的,常用于塑料制品的生产。该母料具有相似的形态,流动性好,使用方便。

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哪些因素會影響拉伸膜的粘度

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