CN106751552A - 一种具有双层结构的高抗刺穿强度改性热收缩薄膜及其制备方法 - Google Patents

一种具有双层结构的高抗刺穿强度改性热收缩薄膜及其制备方法 Download PDF

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CN106751552A
CN106751552A CN201610986960.9A CN201610986960A CN106751552A CN 106751552 A CN106751552 A CN 106751552A CN 201610986960 A CN201610986960 A CN 201610986960A CN 106751552 A CN106751552 A CN 106751552A
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double
shrinkable film
melt
modified heat
antioxidant
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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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Anhui Yi Caini Fibrous Material Science And Technology Ltd
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Abstract

本发明公开了一种具有双层结构的高抗刺穿强度改性热收缩薄膜及其制备方法；该高抗刺穿强度改性热收缩薄膜采用双层构造：内层和外层；外层由以下原料组成：聚对苯二甲酸乙二酯聚合物、聚氯乙烯、无机填料石粉、聚合物相容剂、无毒有机锡稳定剂；内层由以下原料组成：乙烯‑乙酸乙烯酯共聚物、玻纤粉、抗氧剂、增塑剂。本发明的薄膜是一种高抗刺穿强度，透明度极佳的双向收缩的热收缩膜，同时具有高透明度和收缩功能强等优点，在包装过程中稳固性好，降低了运输过程中的破损、倒塌、散包等现象，能适应大部分自动式、半自动式包装机械的要求，可广泛应用在外贸出口、造纸、五金、塑料化工、建材、食品医药行业。

Description

一种具有双层结构的高抗刺穿强度改性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，具体涉及一种具有双层结构的高抗刺穿强度改性热收缩薄膜及其制备方法。
背景技术
热收缩薄膜是一种新型热收缩包装材料；这种材料不仅能降低包装生产成本、运输成本、降低包装体积，还因其有较高的透明度、良好的印刷性能、增加产品的货架期，竞争激烈的市场中能迅速抓住消费者目光、迎合消费者需求。因而在欧美发达国家已得到广泛重视和应用。热收缩薄膜广泛应用于食品、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。目前使用较多的收缩膜是PVC、PE、PP，其次有PVDC、PET、EVA、氯化橡胶等。
多层共挤收缩膜是近年来在POF收缩膜的基础上开发的一种新型高收缩率双向拉伸收缩膜，它可以使产品的物理机械性能发生改变。多层共挤收缩膜生产中通过不同的配方设计和交联度控制可以制得不同性能要求的产品，适应于不同的包装设备和产品。本发明提供了一种具有稳定性好，均衡收缩，延伸率好、透明度高等双层结构的高抗刺穿强度改性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具有双层结构的高抗刺穿强度改性热收缩薄膜。
本发明所要解决的第2个技术问题是上述改性热收缩薄膜的制备方法。
本发明解决的问题是一种具有双层结构的高抗刺穿强度改性热收缩薄膜，该薄膜采用双层构造：内层和外层；外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75-85、聚氯乙烯10-18、无机填料石粉2-4、聚合物相容剂2-4、无毒有机锡稳定剂0.2-1；内层由以下重量份数计的原料组成：乙烯-乙酸乙烯酯共聚物80-90、玻纤粉5-12、抗氧剂5-8、增塑剂0.2-1。
所述玻纤粉的规格型号为E(C)MG-250C。
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。
所述聚合物相容剂为改性聚丙烯酸酯或间-异丙烯基-2,2-二甲基苯酰异氰酸酯。
所述无毒有机锡稳定剂为硫醇甲基锡ST-181、有机锡ST-182、有机锡ST-189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。
所述抗氧剂选自抗氧剂1010、抗氧剂1076、抗氧剂168、抗氧剂264、抗氧剂1099中的一种。
上述改性热收缩薄膜的制备方法，包括以下步骤：
a)干燥处理：将聚对苯二甲酸乙二酯聚合物、聚氯乙烯、乙烯-乙酸乙烯酯共聚物经过流化床以100-120℃的温度干燥4-5h得到干燥原料；
b)熔融挤出：将无机填料石粉、聚合物相容剂、无毒有机锡稳定剂和经过步骤a)中干燥处理的聚对苯二甲酸乙二酯聚合物、聚氯乙烯按比例添加至主挤出机中加热至熔融状态，经过滤得到作为外层的主机熔体；辅助挤出机中按比例加入玻纤粉、增塑剂、抗氧剂和经过步骤a)中干燥处理的乙烯-乙酸乙烯酯共聚物，在经过熔融、抽真空处理后得到作为内层的辅挤熔体；主挤熔体和辅挤熔体在双层模头中汇合挤出；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℃；
c)流延铸片：熔融挤出的混合熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后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℃；
d)单向拉伸：将经由步骤c)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；
e)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到双层构造的热收缩薄膜成品。
本发明的有益效果：本发明的双层结构的高抗刺穿强度改性热收缩薄膜具有以下优点：
1、优异的自粘结性能；
2、良好的柔韧性和拉伸性,包缠能力强；
3、高抗刺穿强度；
4、高透明度和光泽度；
5、收缩功能强，回缩紧固性好；
6、被包物件整体稳固性好，降低了运输过程中的破损、倒塌、散包等现象。
具体实施方式
以下对本发明的具体实施方式进行说明。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，聚对苯二甲酸乙二酯聚合物、聚氯乙烯、乙烯-乙酸乙烯酯共聚物、玻纤粉、抗氧剂1010、1076，滑石粉、重晶石粉、邻苯二甲酸二丁酯、邻苯二甲酸二辛酯为盖德化工网市售品；硫醇甲基锡ST-181、有机锡ST-182为佛山市圣腾高分子材料有限公司市售品。
实施例1
一种具有双层结构的高抗刺穿强度改性热收缩薄膜，该薄膜采用双层构造：内层和外层；外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82、聚氯乙烯12、滑石粉3、改性聚丙烯酸酯2.5、硫醇甲基锡ST-181 0.5；内层由以下重量份数计的原料组成：乙烯-乙酸乙烯酯共聚物83、玻纤粉10、抗氧剂1010 6.5、邻苯二甲酸二丁酯0.5。
上述改性热收缩薄膜的制备方法，包括以下步骤：
a)干燥处理：将聚对苯二甲酸乙二酯聚合物、聚氯乙烯、乙烯-乙酸乙烯酯共聚物经过流化床以110℃的温度干燥4h得到干燥原料；
b)熔融挤出：将无机填料石粉、聚合物相容剂、无毒有机锡稳定剂和经过步骤a)中干燥处理的聚对苯二甲酸乙二酯聚合物、聚氯乙烯按比例添加至主挤出机中加热至熔融状态，经过滤得到作为外层的主机熔体；辅助挤出机中按比例加入玻纤粉、增塑剂、抗氧剂和经过步骤a)中干燥处理的乙烯-乙酸乙烯酯共聚物，在经过熔融、抽真空处理后得到作为内层的辅挤熔体；主挤熔体和辅挤熔体在双层模头中汇合挤出；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℃；
c)流延铸片：熔融挤出的混合熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后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28℃；
d)单向拉伸：将经由步骤c)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95℃，时间为25min，拉伸温度为110℃，拉伸倍数为3倍；
e)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到双层构造的热收缩薄膜成品。
实施例2
一种具有双层结构的高抗刺穿强度改性热收缩薄膜，该薄膜采用双层构造：内层和外层；外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80、聚氯乙烯13、重晶石粉2、改性聚丙烯酸酯4、有机锡ST-182 1；内层由以下重量份数计的原料组成：乙烯-乙酸乙烯酯共聚物82、玻纤粉10、抗氧剂1076 7、邻苯二甲酸二辛酯1。
上述改性热收缩薄膜的制备方法，包括以下步骤：
a)干燥处理：将聚对苯二甲酸乙二酯聚合物、聚氯乙烯、乙烯-乙酸乙烯酯共聚物经过流化床以120℃的温度干燥5h得到干燥原料；
b)熔融挤出：将无机填料石粉、聚合物相容剂、无毒有机锡稳定剂和经过步骤a)中干燥处理的聚对苯二甲酸乙二酯聚合物、聚氯乙烯按比例添加至主挤出机中加热至熔融状态，经过滤得到作为外层的主机熔体；辅助挤出机中按比例加入玻纤粉、增塑剂、抗氧剂和经过步骤a)中干燥处理的乙烯-乙酸乙烯酯共聚物，在经过熔融、抽真空处理后得到作为内层的辅挤熔体；主挤熔体和辅挤熔体在双层模头中汇合挤出；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℃；
c)流延铸片：熔融挤出的混合熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后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℃；
d)单向拉伸：将经由步骤c)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；
e)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到双层构造的热收缩薄膜成品。
使用本发明制备的双层结构的高抗刺穿强度改性热收缩薄膜的技术参数如下：

Claims (8)

1.一种具有双层结构的高抗刺穿强度改性热收缩薄膜，其特征在于，该薄膜采用双层构造：内层和外层；外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75-85、聚氯乙烯10-18、无机填料石粉2-4、聚合物相容剂2-4、无毒有机锡稳定剂0.2-1；内层由以下重量份数计的原料组成：乙烯-乙酸乙烯酯共聚物80-90、玻纤粉5-12、抗氧剂5-8、增塑剂0.2-1。
2.根据权利要求1所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜，其特征在于：所述玻纤粉的规格型号为E(C)MG-250C。
3.根据权利要求1所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜，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。
4.根据权利要求1所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜，其特征在于：所述聚合物相容剂为改性聚丙烯酸酯或间-异丙烯基-2,2-二甲基苯酰异氰酸酯。
5.根据权利要求1所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜，其特征在于：所述无毒有机锡稳定剂为硫醇甲基锡ST-181、有机锡ST-182、有机锡ST-189中的一种。
6.根据权利要求1所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜，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。
7.根据权利要求1所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜，其特征在于：所述抗氧剂选自抗氧剂1010、抗氧剂1076、抗氧剂168、抗氧剂264、抗氧剂1099中的一种。
8.权利要求1-7任意一项所述的一种具有双层结构的高抗刺穿强度改性热收缩薄膜的制备方法，其特征在于，包括以下步骤：
a)干燥处理：将聚对苯二甲酸乙二酯聚合物、聚氯乙烯、乙烯-乙酸乙烯酯共聚物经过流化床以100-120℃的温度干燥4-5h得到干燥原料；
b)熔融挤出：将无机填料石粉、聚合物相容剂、无毒有机锡稳定剂和经过步骤a)中干燥处理的聚对苯二甲酸乙二酯聚合物、聚氯乙烯按比例添加至主挤出机中加热至熔融状态，经过滤得到作为外层的主机熔体；辅助挤出机中按比例加入玻纤粉、增塑剂、抗氧剂和经过步骤a)中干燥处理的乙烯-乙酸乙烯酯共聚物，在经过熔融、抽真空处理后得到作为内层的辅挤熔体；主挤熔体和辅挤熔体在双层模头中汇合挤出；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℃；
c)流延铸片：熔融挤出的混合熔体通过熔体计量泵、过滤器、熔体管道进入衣架式模头后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℃；
d)单向拉伸：将经由步骤c)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；
e)收卷、分切：经过单向拉伸的薄膜通过测厚、牵引收卷，分切得到双层构造的热收缩薄膜成品。
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CN107312294A (zh) * 2017-07-21 2017-11-03 江苏中大包装材料有限公司 一种层状式塑料薄膜的制备方法
CN114836009A (zh) * 2021-12-24 2022-08-02 浙江坤垣材料科技有限公司 一种低温热收缩膜及其制备方法
CN114672109B (zh) * 2022-04-02 2023-04-07 宜兴市光辉包装材料有限公司 Pvc热收缩标签膜及其制备方法

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CN101754853A (zh) * 2007-07-23 2010-06-23 纳幕尔杜邦公司 定向后显示收缩稳定性的可热收缩的多层膜或管

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107312294A (zh) * 2017-07-21 2017-11-03 江苏中大包装材料有限公司 一种层状式塑料薄膜的制备方法
CN114836009A (zh) * 2021-12-24 2022-08-02 浙江坤垣材料科技有限公司 一种低温热收缩膜及其制备方法
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