CN106519599B - 一种具有高稳定性多用途热收缩薄膜及其制备方法 - Google Patents

一种具有高稳定性多用途热收缩薄膜及其制备方法 Download PDF

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CN106519599B
CN106519599B CN201610935297.XA CN201610935297A CN106519599B CN 106519599 B CN106519599 B CN 106519599B CN 201610935297 A CN201610935297 A CN 201610935297A CN 106519599 B CN106519599 B CN 106519599B
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shrinkable film
high stability
melt
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plasticizer
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章云
张贝尼
张娃妮
柯模松
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Anhui Yi Caini Fibrous Material Science And Technology Ltd
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Abstract

本发明公开了一种具有高稳定性多用途新型热收缩薄膜及其制备方法；该高稳定性多用途新型热收缩薄膜采用三层构造：顶层，夹层，底层；夹层由以下原料组成：聚对苯二甲酸乙二酯聚合物、MBS、聚合物相容剂、稳定剂、增塑剂；顶层和底层成分相同，由以下原料组成：线性低密度聚乙烯、塑料光纤、无机填料石粉、光稳定剂、增塑剂。本发明的薄膜是一种强韧的，透明度极佳的双向收缩的热收缩膜，在包装过程中有非常出色的收缩率，并且封口牢固，持久，收缩温度范围广；在使用过程中能适应大部分自动式、半自动式包装机械的要求，是一种经济实惠型产品，可以广泛应用于食品、药品、消毒餐具、文体用品等各种产品的外包装。

Description

一种具有高稳定性多用途热收缩薄膜及其制备方法
技术领域
本发明属于热收缩包装材料领域，具体涉及一种高稳定性多用途热收缩薄膜及其制备方法。
背景技术
聚酯热收缩薄膜是一种新型热收缩包装材料；由于它具有易于回收、无毒、无味、机械性能好、特别是符合环境保护等特点，在发达国家聚酯已成为取代聚氯乙烯热收缩薄膜的理想替代品。随着中国塑料包装工业的不断发展和人民生活水平的不断提高，目前果汁、汽水等饮料大多采用综合性能优良、有较好阻隔性能、无毒无味的聚酯塑料瓶进行包装，其用量十分可观。据统计，目前全国聚酯饮料瓶用量至少达25万吨以上，与之配套的聚酯热收缩标签薄膜用量则可达2-3万吨。另外，热收缩膜也广泛应用于药品、消毒餐具、文体用品、工艺礼品、印刷品、五金塑料制品、电话机、电子电器等等各种产品的外包装；尤其是在不规则形体物品或商品的组合式(集束)包装方面，既能满足商品的防潮防尘、防触摸偷换、透明展示等功能，又能增加产品外观吸引力，也可用于代替各类纸盒，不但节约包装成本，而且符合包装潮流。收缩膜(袋)可加工制成：平口袋、圆弧形袋、梯形袋、立体袋等异形袋子。
但是，普通聚酯是结晶型高聚物，普通聚酯薄膜经过特殊工艺处理只能得到30％以下的热收缩率。另外聚酯热收缩膜运用于托盘包装，要求聚酯薄膜能够均衡收缩，这样预先印刷在薄膜的图案在收缩后不会扭曲太厉害。若要获得更高热收缩率的聚酯薄膜，也必须进行改良。为解决当前的问题，本发明提供了一种具有高稳定性，均衡收缩，拉伸强度高，延伸率大、自粘性好，透明度高等多用途新型热收缩薄膜及其制备方法。
发明内容
本发明所要解决的第1个技术问题是提供一种高稳定性多用途热收缩薄膜。
本发明所要解决的第2个技术问题是上述热收缩薄膜的制备方法。
本发明解决的问题是一种具有高稳定性多用途热收缩薄膜，该薄膜采用三层构造：顶层，夹层，底层；顶层，夹层，底层；夹层由以下重量份数计的原料组成：聚对苯二甲酸乙二酯聚合物85-90、甲基丙烯酸甲酯、丁二烯、苯乙烯三元共聚物MBS 5-10、聚合物相容剂2-4、稳定剂0.2-1、增塑剂0.2-1；顶层和底层成分相同，由以下重量份数计的原料组成：线性低密度聚乙烯(LLDPE)70-75、塑料光纤(POF)15-25、无机填料石粉2-4、光稳定剂5-8、增塑剂0.2-1。
所述聚合物相容剂为PE相容剂WP120或马来酸酐接枝SEBS。
所述稳定剂为TF-500JP、A100A或BO-349中的一种。
所述增塑剂为邻苯二甲酸二丁酯或邻苯二甲酸二辛酯。
所述线性低密度聚乙烯(LLDPE)的产品规格为7042、3305、3224中的一种。
所述塑料光纤(POF)的型号为POF001。
所述无机填料石粉为活性碳酸钙粉、滑石粉或重晶石粉中的一种。
所述光稳定剂为光稳定剂770、光稳定剂944、光稳定剂622中的一种。
上述热收缩薄膜的制备方法，包括以下步骤：
(1)干燥处理：将聚对苯二甲酸乙二酯聚合物、线性低密度聚乙烯、塑料光纤、光稳定剂放置于80-90℃的鼓风干燥箱中干燥6-10h后取出；
(2)熔融挤出：按配方比例将MBS、聚合物相容剂、稳定剂、增塑剂和经过干燥处理的聚对苯二甲酸乙二酯聚合加入主挤出机中加热成熔融状态，经过过滤得到作为夹层的主挤熔体；辅助挤出机按配方比例加入无机填料石粉、增塑剂和经过干燥处理的线性低密度聚乙烯、塑料光纤、光稳定剂，在经过加热熔融、抽真空处理后得到作为顶层和底层的辅挤熔体；将主挤熔体和辅挤熔体在三层模头中汇合挤出；其中主挤出机熔融温度为250-260℃，辅助挤出机熔融温度为200-220℃，汇合挤出温度为220-240℃；
(3)流延铸片：熔融挤出的熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后从模唇口流延至冷却转鼓上而形成铸片；其中，冷却转鼓的冷却水温度控制在20-30℃；
(4)单向拉伸：将经由步骤(3)得到的铸片通过预热之后再加热，趁热进行横向拉伸和纵向拉伸倍数处理；其中，拉伸的预热温度为90-100℃，时间为15-30min，拉伸温度为105-115℃，拉伸倍数为3-4倍；
(5)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到热收缩薄膜成品。
本发明的有益效果：本发明的聚酯膜具有高稳定性，均衡收缩，拉伸强度高，延伸率大、自粘性好，透明度高等特点；对堆放在托板上的货物进行缠绕包装，使包装物更加稳固整洁，更超强防水。
具体实施方式
以下对本发明的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明，并不用于限制本发明。实施例中，MBS、线性低密度聚乙烯LLDPE 3305、7042，马来酸酐接枝SEBS、PE相容剂WP120、邻苯二甲酸二丁酯、邻苯二甲酸二辛酯、滑石粉、重晶石粉、稳定剂TF-500JP为盖德化工网市售品；塑料光纤POF001为深圳市三凯光电技术有限公司市售品；光稳定剂944、770为南京华立明化工有限公司市售品。
实施例1
一种具有高稳定性多用途热收缩薄膜，该薄膜采用三层构造：顶层，夹层，底层；顶层，夹层，底层；夹层由以下重量份数计的原料组成：聚对苯二甲酸乙二酯聚合物87、甲基丙烯酸甲酯、丁二烯、苯乙烯三元共聚物MBS 9、马来酸酐接枝SEBS 3、稳定剂TF-500JP 0.5、邻苯二甲酸二丁酯0.5；顶层和底层成分相同，由以下重量份数计的原料组成：线性低密度聚乙烯(LLDPE)3305 72、塑料光纤(POF)18、重晶石粉3、光稳定剂944 6.5、邻苯二甲酸二丁酯0.5。
上述热收缩薄膜的制备方法，包括以下步骤：
(1)干燥处理：将聚对苯二甲酸乙二酯聚合物、线性低密度聚乙烯、塑料光纤、光稳定剂放置于85℃的鼓风干燥箱中干燥8h后取出；
(2)熔融挤出：按配方比例将MBS、聚合物相容剂、稳定剂、增塑剂和经过干燥处理的聚对苯二甲酸乙二酯聚合加入主挤出机中加热成熔融状态，经过过滤得到作为夹层的主挤熔体；辅助挤出机按配方比例加入无机填料石粉、增塑剂和经过干燥处理的线性低密度聚乙烯、塑料光纤、光稳定剂，在经过加热熔融、抽真空处理后得到作为顶层和底层的辅挤熔体；将主挤熔体和辅挤熔体在三层模头中汇合挤出；其中主挤出机熔融温度为250℃，辅助挤出机熔融温度为210℃，汇合挤出温度为230℃；
(3)流延铸片：熔融挤出的熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后从模唇口流延至冷却转鼓上而形成铸片；其中，冷却转鼓的冷却水温度控制在27℃；
(4)单向拉伸：将经由步骤(3)得到的铸片通过预热之后再加热，趁热进行横向拉伸和纵向拉伸倍数处理；其中，拉伸的预热温度为96℃，时间为25min，拉伸温度为110℃，拉伸倍数为3倍；
(5)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到热收缩薄膜成品。
实施例2
一种具有高稳定性多用途热收缩薄膜，该薄膜采用三层构造：顶层，夹层，底层；顶层，夹层，底层；夹层由以下重量份数计的原料组成：聚对苯二甲酸乙二酯聚合物89、甲基丙烯酸甲酯、丁二烯、苯乙烯三元共聚物MBS 6、PE相容剂WP120 3.4、稳定剂TF-500JP 1、邻苯二甲酸二辛酯0.6；顶层和底层成分相同，由以下重量份数计的原料组成：线性低密度聚乙烯(LLDPE)7042 75、塑料光纤(POF)16、滑石粉2、光稳定剂770 6、邻苯二甲酸二辛酯1。
上述热收缩薄膜的制备方法，包括以下步骤：
(1)干燥处理：将聚对苯二甲酸乙二酯聚合物、线性低密度聚乙烯、塑料光纤、光稳定剂放置于90℃的鼓风干燥箱中干燥10h后取出；
(2)熔融挤出：按配方比例将MBS、聚合物相容剂、稳定剂、增塑剂和经过干燥处理的聚对苯二甲酸乙二酯聚合加入主挤出机中加热成熔融状态，经过过滤得到作为夹层的主挤熔体；辅助挤出机按配方比例加入无机填料石粉、增塑剂和经过干燥处理的线性低密度聚乙烯、塑料光纤、光稳定剂，在经过加热熔融、抽真空处理后得到作为顶层和底层的辅挤熔体；将主挤熔体和辅挤熔体在三层模头中汇合挤出；其中主挤出机熔融温度为260℃，辅助挤出机熔融温度为220℃，汇合挤出温度为240℃；
(3)流延铸片：熔融挤出的熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后从模唇口流延至冷却转鼓上而形成铸片；其中，冷却转鼓的冷却水温度控制在30℃；
(4)单向拉伸：将经由步骤(3)得到的铸片通过预热之后再加热，趁热进行横向拉伸和纵向拉伸倍数处理；其中，拉伸的预热温度为100℃，时间为30min，拉伸温度为115℃，拉伸倍数为4倍；
(5)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到热收缩薄膜成品。
使用本发明制备的高稳定性多用途新型热收缩薄膜的技术参数如下：

Claims (9)

1.一种具有高稳定性多用途热收缩薄膜，其特征在于，该薄膜采用三层构造：顶层，夹层，底层；夹层由以下重量份数计的原料组成：聚对苯二甲酸乙二酯聚合物85-90、甲基丙烯酸甲酯、丁二烯、苯乙烯三元共聚物MBS 5-10、聚合物相容剂2-4、稳定剂0.2-1、增塑剂0.2-1；顶层和底层成分相同，由以下重量份数计的原料组成：线性低密度聚乙烯(LLDPE)70-75、塑料光纤POF 15-25、无机填料石粉2-4、光稳定剂5-8、增塑剂0.2-1。
2.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述聚合物相容剂为PE相容剂WP120或马来酸酐接枝SEBS。
3.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述稳定剂为TF-500JP，A100A或BO-349中的一种。
4.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述增塑剂为邻苯二甲酸二丁酯或邻苯二甲酸二辛酯。
5.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述线性低密度聚乙烯LLDPE的产品规格为7042、3305、3224中的一种。
6.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述塑料光纤POF的型号为POF001。
7.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述无机填料石粉为活性碳酸钙粉，滑石粉或重晶石粉中的一种。
8.根据权利要求1所述的一种具有高稳定性多用途热收缩薄膜，其特征在于：所述光稳定剂为光稳定剂770、光稳定剂944、光稳定剂622中的一种。
9.权利要求1-8任意一项所述的一种具有高稳定性多用途热收缩薄膜的制备方法，其特征在于，包括以下步骤：
(1)干燥处理：将聚对苯二甲酸乙二酯聚合物、线性低密度聚乙烯、塑料光纤POF、光稳定剂放置于80-90℃的鼓风干燥箱中干燥6-10h后取出；
(2)熔融挤出：经过干燥处理的聚对苯二甲酸乙二酯聚合物和MBS、聚合物相容剂、稳定剂、增塑剂加入主挤出机中加热成熔融状态，
经过过滤得到作为夹层的主挤熔体；辅助挤出机按配方比例加入线性低密度聚乙烯、塑料光纤POF和无机填料石粉、光稳定剂、增塑剂，在经过加热熔融、抽真空处理后得到作为顶层和底层的辅挤熔体；将主挤熔体和辅挤熔体在三层模头中汇合挤出；其中主挤出机熔融温度为250-260℃，辅助挤出机熔融温度为200-220℃，汇合挤出温度为220-240℃；
(3)流延铸片：熔融挤出的熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后从模唇口流延至冷却转鼓上而形成铸片；其中，冷却转鼓的冷却水温度控制在20-30℃；
(4)双向拉伸：将经由步骤(3)得到的铸片通过预热之后再加热，趁热进行横向拉伸和纵向拉伸倍数处理；其中，拉伸的预热温度为90-100℃，时间为15-30min，拉伸温度为105-115℃，拉伸倍数为3-4倍；
(5)收卷、分切：经过双向拉伸的薄膜通过测厚、牵引收卷、分切得到热收缩薄膜成品。
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