CN103980622A - 一种bopp薄膜用高表面张力复合型爽滑抗粘连母料及其生产工艺 - Google Patents

一种bopp薄膜用高表面张力复合型爽滑抗粘连母料及其生产工艺 Download PDF

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CN103980622A
CN103980622A CN201410228384.2A CN201410228384A CN103980622A CN 103980622 A CN103980622 A CN 103980622A CN 201410228384 A CN201410228384 A CN 201410228384A CN 103980622 A CN103980622 A CN 103980622A
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surface tension
masterbatch
film
high surface
district
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涂志刚
陈伟文
钟永强
张莉琼
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ZHONGSHAN BALANCE PLASTIC SCIENCE AND TECHNOLOGY Co Ltd
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ZHONGSHAN BALANCE PLASTIC SCIENCE AND TECHNOLOGY Co Ltd
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Abstract

本发明公开了一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料及其生产工艺，该母料包括以下重量百分比组分：聚丙烯共聚物65％-80％，高效爽滑剂3％-5％，高分散性抗粘连剂3％-5％，接枝聚合物14-25％；其制备方法为称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型。本发明改善了爽滑剂和抗粘连剂共存对所生产的薄膜的摩擦系数、透明度、雾度和表面张力等综合性能的影响，使得生产的BOPP薄膜摩擦系数小且稳定，透光率高，雾度小，表面张力稳定，使用性能稳定，适于高速生产和使用。

Description

一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料及其生产工艺
【技术领域】
本发明涉及一种高表面张力复合型爽滑抗粘连母料及其生产工艺，尤其涉及一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料及其生产工艺，属于塑料薄膜用功能助剂技术领域。
【背景技术】
在包装材料中，BOPP薄膜在包装领域中有着十分广泛的应用，而且随着市场的不断扩展，BOPP薄膜生产和使用向高速度、高品质和自动化方向发展。由于树脂本身不具有爽滑性和抗粘连性，在BOPP薄膜的生产过程中，为了防止BOPP薄膜之间发生粘连，影响薄膜的高速使用性能，需要在BOPP薄膜的表层添加爽滑剂和抗粘连剂来解决这些问题。
目前，BOPP薄膜的爽滑抗粘连母料都存在一些普遍的问题。问题一是影响光泽度和透明性，由于某一些类型爽滑剂的迁移，在薄膜表面积聚，以及助剂的稳定性都对薄膜的透光率和雾度造成影响，而且随着时间增加光泽度和透明性衰减加重，有些抗粘连剂则极大地影响薄膜的光泽度和透明性，使薄膜性能的达不到指标要求；问题二是表面摩擦系数的偏高。有的爽滑抗粘连母料所生产的薄膜存在摩擦系数逐渐偏大，摩擦系数达不到要求，有一些薄膜的爽滑性能没有持续性，摩擦系数很快提高，影响薄膜的高速使用性能，从而降低客户的生产效率；问题三是表面张力问题。这是一个比较普遍的问题，由于一般大量采用迁移性爽滑剂和抗粘连剂，助剂的迁移可以迅速降低薄膜的摩擦系数，但也降低了薄膜的表面张力，使表面张力衰减过快，对薄膜的印刷、涂覆、镀铝或复合等二次加工都有较大的影响,如何协调解决爽滑性、抗粘连性、光学性能以及表面张力之间的技术矛盾是目前现有技术的一大难题。以上问题都对薄膜的质量和使用产生较大的影响。
现有技术中，也有对BOPP薄膜的功能性母料进行改进的，例如中国专利(专利申请号:200810027413.3):一种BOPP薄膜用的无机抗粘连母料及其生产工艺和专利(申请号：201010193708.5)：一种BOPP薄膜用的复合型爽滑母料及其生产工艺。但这两个技术方案都属于单一性能的功能性母料，而无法将两种功能集中在一个母料中，由于薄膜需要同时具备爽滑抗粘连性能，就必须同时添加两种母料才能达到同样效果，而添加两种母料时，必须混合均匀才可添加，这就存在着分散均匀性问题，影响薄膜爽滑抗粘连性能的稳定性。另一方面，功能单一的母料，就意味着生产时要运行多次工艺路线，生产两次功能母料，从生产，添加工艺上，功能单一的母料都势必带来成本高的负担。
【发明内容】
本发明的目的在于克服现有技术的缺点，提供一种使BOPP薄膜摩擦系数小且稳定，透光率高，雾度小，表面张力稳定，使用性能稳定，协调了爽滑抗粘连性能，光学性能以及表面张力之间的技术矛盾，适于高速生产使用的BOPP薄膜用高表面张力复合型爽滑抗粘连母料。
本发明的另一目的是提供一种上述高表面张力复合型爽滑抗粘连母料的生产工艺。
本发明为了实现上述目的，采用以下技术方案：
一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于包括以下重量百分比组分：
上述各组分含量之和为100％。
上述母料中还添加适量抗氧剂，抗氧剂以母料上述其他组分总和100％为基数添加。
本发明中的聚丙烯共聚物为乙烯-丙烯共聚物和乙烯-丙烯-辛烯共聚物中的一种或两种。
本发明中的高效爽滑剂为分子量50000-500000的硅酮、有机硅含量为80％以上和平均粒径为3-10微米的硅酮粉、分子量范围为5000-10000的高分子量聚乙烯蜡、分子量范围为5000-15000的高分子量聚丙烯蜡中的一种或几种的混合物。
本发明中的高分散性抗粘连剂为平均粒径3-50微米的二氧化硅颗粒、平均粒径3-50微米的有机硅树脂颗粒、平均粒径3-50微米的有机玻璃微珠，平均粒径3-50微米的硅藻土中的一种或几种的混合物。
本发明中的接枝聚合物为聚丙烯接枝马来酸酐、聚乙烯接枝马来酸酐、EPDM接枝马来酸酐、POE接枝马来酸酐、聚丙烯接枝甲基丙烯酸缩水甘油酯、聚丙烯接枝甲基丙烯酸、聚丙烯接枝丙烯酰胺中的一种或几种的混合物。
制备上述BOPP薄膜用高表面张力复合型爽滑抗粘连母料的生产工艺，其特征在于包括以下步骤：
称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型。
本发明生产工艺中双螺杆挤出机的生产温度范围控制在160℃-205℃，双螺杆挤出机的熔体压力控制在1.0Mpa-5.0Mpa，熔体温度控制在185℃-195℃，主机电流控制在设备额定电流的80-85％，主机转速控制在270r/min-350r/min，喂料转速控制在25r/min-40r/min，具体地各区生产温度如表一所示：
表一：
本发明所述薄膜用的高表面张力复合型爽滑抗粘连母料是采用高效爽滑剂和高分散的抗粘连剂复配而成，抗粘连剂减少了薄膜的接触面，超爽滑剂在表面形成滑动层，使薄膜具有优良的爽滑性。在适当的使用条件下，薄膜摩擦系数可达到0.2以下。而且，本发明的抗粘连剂对薄膜的光学性能没有影响。同时，采用了一种极性接枝聚合物，用于印刷或复合薄膜，薄膜的表面张力保持良好，电晕处理后，表面张力高且衰减慢。
在薄膜的表层添加微米级颗粒状的抗粘连剂，由于在薄膜加工的温度条件下抗粘连剂不溶解，在薄膜的表层仍然以颗粒状存在，并且颗粒尺寸比表层大，所以会在表层凸起，薄膜叠合时或者薄膜使用时与设备接触的接触面大大减小，减少了薄膜阻力；薄膜的表层同时加入了爽滑剂，在薄膜外表面形成了一层润滑层，抗粘连颗粒与爽滑剂协同作用，可以显著降低摩擦系数。但是由于它们与机体材料聚丙烯不相容，可能极大地影响薄膜的光学性能，协调材料之间的相容性，保持一致的折光率很关键。聚丙烯接枝物的一端有非极性长烷基链，另一端是极性接枝基团，根据相似相容原理，聚丙烯接枝物中非极性长烷基链与基体聚丙烯有较好的相容性，极性接枝基团与抗粘连剂有较好的相容性，这样可以解决抗粘连剂与聚丙烯的界面相容，极性接枝基团可以赋予薄膜表面较高的表面张力。
本发明相对于现有技术，有以下优点：
本发明属于多性能的功能性母料，由于薄膜需要同时具备爽滑抗粘连性能，本发明只需一次性添加一种母料，添加量少，成本低；本发明直接添加，分散性良好，避免了功能添加剂的预分散问题，不存在分散不均匀的问题，影响薄膜爽滑抗粘连性能的稳定性。
本发明通过接枝聚合物对薄膜表面张力进行改良，电晕后薄膜表面张力高衰减慢且稳定性良好，适用于印刷、涂覆、镀铝或复合。
本发明改善了爽滑剂和抗粘连剂共存对所生产的薄膜的摩擦系数、透明度、雾度和表面张力等综合性能的影响，克服现有的技术中薄膜性能指标不平衡的缺陷，使得生产的BOPP薄膜摩擦系数小且稳定，透光率高，雾度小，表面张力稳定，使用性能稳定，适于高速生产和使用。
应用本发明添加母料生产的薄膜摩擦力小，表面张力大，使用时效性稳定，透光率高，雾度小，应用时使得生产效率提高，包装速度快，使用方便。
【具体实施方式】
下面结合具体实施例对本发明作进一步说明：
实施例1：
爽滑抗粘连母料的重量百分比组成如下：
其中的高效爽滑剂为硅酮、硅酮粉和聚丙烯蜡按重量比2：2：1的混合物；高分散性抗粘连剂为平均粒径3μm的二氧化硅颗粒、平均粒径5μm的有机硅树脂颗粒、平均粒径5μm的有机玻璃微珠按重量比2：3：5的混合物。
实施例1爽滑抗粘连母料的生产工艺为：称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型；
其中双螺杆挤出机的各区生产温度见表二，双螺杆挤出机的熔体压力为2.5Mpa，主机电流控制在42A，主机转速控制在300r/min，喂料转速控制在30r/min，切粒机转速为400r/min。
表二：
实施例2：
爽滑抗粘连母料的重量百分比组成如下：
其中的高效爽滑剂为聚乙烯蜡和硅酮粉的混合物；高分散性抗粘连剂为二氧化硅颗粒和硅藻土的混合物。
实施例2的生产工艺为：称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型；
其中双螺杆挤出机的各区生产温度的范围控制与实施例一相同，双螺杆挤出机的熔体压力为2.45Mpa，主机电流控制在43A，主机转速控制在300r/min，喂料转速控制在29r/min，切粒机转速为385r/min。
实施例3：
爽滑抗粘连母料的重量百分比组成如下：
其中的聚丙烯共聚物为乙烯-丙烯共聚物、乙烯-丙烯-辛烯共聚物的混合物，高效爽滑剂为硅酮粉，高分散性抗粘连剂为有机硅树脂，聚合物接枝物为聚丙烯接枝马来酸酐和EPDM接枝马来酸酐、POE接枝马来酸酐的混合物。
实施例3的生产工艺为：称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型；
其中双螺杆挤出机的各区生产温度的范围控制见表三，双螺杆挤出机的熔体压力为2.5Mpa，主机电流控制在43A，主机转速控制在300r/min，喂料转速控制在27r/min，切粒机转速为380r/min。
表三：
实施例4：
爽滑抗粘连母料的重量百分比组成如下：
其中的高效爽滑剂为硅酮和聚丙烯蜡的混合物，高分散性抗粘连剂为二氧化硅颗粒和有机玻璃微珠的混合物，聚合物接枝物为聚丙烯接枝马来酸酐和聚丙烯接枝丙烯酰胺的混合物。
实施例4的生产工艺为：称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型；
其中双螺杆挤出机的各区生产温度的范围控制与实施例3相同，双螺杆挤出机的熔体压力为1Mpa，主机电流控制在42A，主机转速控制在270r/min，喂料转速控制在25r/min切粒机转速为395r/min，。
实施例5：
爽滑抗粘连母料的重量百分比组成如下：
其中的高效爽滑剂为硅酮和聚丙烯蜡的混合物，高分散性抗粘连剂为二氧化硅颗粒和有机玻璃微珠的混合物，聚合物接枝物为聚丙烯接枝马来酸酐和聚丙烯接枝丙烯酰胺的混合物。
实施例5的生产工艺为：称取各组分原料，将称取的原料通过混料机以转速80r/min混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型；
其中双螺杆挤出机的各区生产温度的范围见表四，双螺杆挤出机的熔体压力为5Mpa，主机电流控制在42A，主机转速控制在350r/min，喂料转速控制在40r/min，切粒机转速为390r/min。
表四：
本发明爽滑抗粘连母料在BOPP薄膜生产中的使用量为3-5wt％。
将实施例1-5生产的爽滑抗粘连母料用于生产三层结构的21微米厚的BOPP薄膜，添加于薄膜的表层，添加量为3％，跟踪BOPP薄膜生产后间隔一周，两周和四周后的性能指标，其结果如表五所示。
表五：生产后一周、两周和四周的性能指标检测数据
(注：内面是指薄膜与机器导辊相接触的一面，外面是指薄膜不与机器导辊接触的一面)
由此可得，应用本发明的BOPP薄膜总体性能也有大幅改善。同时协调了抗粘连特性、爽滑特性、光学性能与表面张力之间的矛盾。生产的薄膜抗粘连性能良好，摩擦系数低、光泽度高、雾度低，而且薄膜的表面张力保持良好。

Claims (10)

1.一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于包括以下重量百分比组分：
上述各组分含量之和为100％。
2.根据权利要求1所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于所述的聚丙烯共聚物为乙烯-丙烯共聚物、乙烯-丙烯-辛烯共聚物中的一种或两种。
3.根据权利要求1所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于所述的高效爽滑剂为分子量50000-500000的硅酮、有机硅含量为80％以上和平均粒径为3-10微米的硅酮粉、分子量范围为5000-10000的聚乙烯蜡、分子量范围为5000-15000的聚丙烯蜡中的一种或几种的混合物。
4.根据权利要求1所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于所述的高分散性抗粘连剂为平均粒径3-50μm的二氧化硅颗粒、平均粒径5-50μm的有机硅树脂颗粒、平均粒径5-50μm的有机玻璃微珠，平均粒径3-50μm的硅藻土中的一种或几种的混合物。
5.根据权利要求1所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于所述接枝聚合物为聚丙烯接枝马来酸酐、聚乙烯接枝马来酸酐、EPDM接枝马来酸酐、POE接枝马来酸酐、聚丙烯接枝甲基丙烯酸缩水甘油酯、聚丙烯接枝甲基丙烯酸、聚丙烯接枝丙烯酰胺中的一种或几种的混合物。
6.根据权利要求1所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料，其特征在于还包括适量抗氧剂。
7.制备权利要求1-6任一项所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料的生产工艺，其特征在于包括以下步骤：
称取各组分原料，将称取的原料通过混料机混合均匀，再将混合好的原料经由双螺杆挤出机熔融挤出，再经干燥、冷却、切粒成型。
8.根据权利要求7所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料的生产工艺，其特征在于所述的混料机的转速为80r/min。
9.根据权利要求7所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料的生产工艺，其特征在于所述双螺杆挤出机的生产温度范围控制在160℃-205℃，所述的双螺杆挤出机的熔体压力控制在1.0Mpa-5.0Mpa，主机电流控制在设备额定电流的80-85％，主机转速控制在270r/min-350r/min，喂料转速控制在25r/min-40r/min。
10.根据权利要求9所述的一种BOPP薄膜用高表面张力复合型爽滑抗粘连母料的生产工艺，其特征在于所述双螺杆挤出机的生产温度具体为1区：160-170℃，2区：175-185℃，3区：180-190℃，4区：185-195℃，5区：195-205℃，6区：195-205℃，7区：195-205℃，8区：190-200℃，9区：185-195℃，10区：185-195℃，机头温度：185-195℃，物料温度：185-195℃。
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CN107932942B (zh) * 2017-12-15 2020-06-02 广东威孚包装材料有限公司 一种用于精密打印的bopp薄膜及其制备方法
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