CN108045042A - 一种增韧型蒸煮膜及其制备方法 - Google Patents

一种增韧型蒸煮膜及其制备方法 Download PDF

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CN108045042A
CN108045042A CN201711064986.9A CN201711064986A CN108045042A CN 108045042 A CN108045042 A CN 108045042A CN 201711064986 A CN201711064986 A CN 201711064986A CN 108045042 A CN108045042 A CN 108045042A
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layer
toughening
ethylene
mass percent
hot sealing
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蔡岩胜
蔡扬龙
刘桂华
陈小锋
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Hubei Moral Prestige Packaging Science And Technology Ltd
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Hubei Moral Prestige Packaging Science And Technology Ltd
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    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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Abstract

本发明属于蒸煮膜技术领域。一种增韧型蒸煮膜，它由热封层、芯层、增韧层、电晕层依次层叠布置流延共挤而成；所述热封层的材料中各原料占所述热封层的质量百分数分别为：三元无规共聚聚丙烯树脂40‑50％、乙烯‑醋酸乙烯共聚物40‑50％、改性母料10‑20％；所述芯层的材料中各原料占所述芯层的质量百分数分别为：拉丝级聚丙烯树脂30‑50％、乙丙弹性体25‑35％、茂金属聚乙烯25‑35％；所述增韧层的材料中各原料占所述增韧层质量百分数分别为：聚丙烯树脂65‑75％、乙丙弹性体5‑10％、高密度聚乙烯15‑25％，聚酰胺树脂5‑10％，马来酸酐0.01‑0.2％。所述蒸煮膜的抗穿刺性能优异、阻隔性能好、耐高温。

Description

一种增韧型蒸煮膜及其制备方法
技术领域
本发明属于蒸煮膜技术领域，具体涉及一种增韧型蒸煮膜及其制备方法。
背景技术
蒸煮膜是进行热加工处理时所用的塑料膜。目前食品包装行业所使用的蒸煮膜大多是由聚丙烯制成，但是由于聚丙烯原料本身的特点决定了所制成的蒸煮膜在理化性能上有诸多不足。在制袋成型包装后，由于蒸煮膜与产品的相互摩擦，会出现破袋，刮伤的缺陷。现有蒸煮膜的抗穿刺性能、抗拉扯性能较差，理化性能指标较低。
发明内容
本发明所要解决的技术问题是提供一种增韧型蒸煮膜及其制备方法，以解决现有的蒸煮膜不能满足市场需求的问题。
为了实现上述目的，本发明所采取的技术方案是：一种增韧型蒸煮膜，由热封层、芯层、增韧层、电晕层依次层叠布置流延共挤而成；所述的热封层、芯层、增韧层、电晕层所占质量百分数分别为：17-18％、26-27％、37-38％、17-18％；
所述热封层的材料采用三元无规共聚聚丙烯(PP)树脂、乙烯-醋酸乙烯共聚物(EVA)和改性母料混合而成，各原料占所述热封层的质量百分数分别为：三元无规共聚聚丙烯(PP)树脂40-50％、乙烯-醋酸乙烯共聚物(EVA)40-50％、改性母料10-20％；
所述芯层的材料由拉丝级聚丙烯树脂、乙丙弹性体和茂金属聚乙烯(线型)混合而成，各原料占所述芯层的质量百分数分别为：拉丝级聚丙烯树脂30-50％、乙丙弹性体25-35％、茂金属聚乙烯25-35％；
所述增韧层的材料由拉丝级聚丙烯树脂、乙丙弹性体，高密度聚乙烯(HDPE)，聚酰胺树脂和马来酸酐混合而成，各原料占所述增韧层质量百分数分别为：聚丙烯树脂65-75％、乙丙弹性体5-10％、高密度聚乙烯15-25％，聚酰胺树脂5-10％，马来酸酐0.01-0.2％；
在上述技术方案的基础上，本发明还可以有如下进一步的具体选择或优化选择。
具体的，所述电晕层的材料采用聚丙烯(如：上海石化PP聚丙烯塑料粒子F800EDF，可提供良好的电晕润湿张力)和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：聚丙烯75-85％、乙烯-甲基丙烯酸甲酯共聚物15-25％；或为丙烯-乙烯无规共聚物和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：丙烯-乙烯无规共聚物75-85％、乙烯-甲基丙烯酸甲酯共聚物15-25％。
具体的，所述改性母料由低密度聚乙烯、茂金属聚乙烯(线型)和滑爽剂混合而成，各原料所占质量百分数分别为：低密度聚乙烯65-75％，茂金属聚乙烯(线型)10-20％、滑爽剂5-15％。
优选的，所述爽滑剂为芥酸酰胺。
具体的，所述低密度聚乙烯的密度为0.925g/cm3以下。
此外，本发明还提供了制备上述增韧型蒸煮膜的方法，其包括如下步骤：
1)按热封层、芯层、增韧层、电晕层所占质量百分数分别为：17-18％、26-27％、37-38％、17-18％，选取热封层、芯层、增韧层、电晕层的材料；
2)将热封层、芯层、增韧层、电晕层依次层叠布置流延四层共挤，得到增韧型蒸煮膜。
本发明的有益效果是：
1、所述增韧型蒸煮膜抗穿刺性能优异(耐冲击性优秀)。柔韧性好，蒸煮效果好，且不易变形。
2、所述增韧型蒸煮膜耐高温，承受135℃以上70分钟高温蒸煮，蒸煮后不破袋漏气，无热变形。
3、该方法制备的蒸煮膜的热封强度较高(为17N/104度)，由于其优异的阻隔性能，保鲜效果优良。
4、此膜可用于超低温(80-95℃)热封，提高机包速度，生产效率提高40-50％。
附图说明
图1是本发明的结构示意图。
图中：1-热封层，2-芯层，3-增韧层，4-电晕层。
具体实施方式
为了更好地理解本发明，下面结合附图及具体实施例进一步阐明本发明的内容，但本发明的内容不仅仅局限于下面的实施例。
实施例1：
如图1所示，本发明提供了一种增韧型蒸煮膜，由热封层1、芯层2、增韧层3、电晕层4依次层叠布置流延四层共挤而成；所述的热封层、芯层、增韧层、电晕层所占质量百分数分别为：18％、27％、37％、18％；
所述的热封层的材料采用三元无规共聚聚丙烯(PP)树脂、乙烯-醋酸乙烯共聚物(EVA)和改性母料混合而成，各原料占所述热封层的质量百分数分别为：三元无规共聚聚丙烯(PP)树脂50％、乙烯-醋酸乙烯共聚物(EVA)40％、改性母料10％，；
所述的芯层的材料由拉丝级聚丙烯树脂、乙丙弹性体和茂金属聚乙烯(线型)混合而成，各原料占所述芯层的质量百分数分别为：拉丝级聚丙烯树脂30％、乙丙弹性体35％、茂金属聚乙烯35％；
所述的增韧层的材料由拉丝级聚丙烯树脂、乙丙弹性体，高密度聚乙烯，聚酰胺树脂和马来酸酐混合而成，各原料占所述增韧层质量百分数分别为：聚丙烯树脂74.9％、乙丙弹性体5％、高密度聚乙烯15％，聚酰胺树脂5％，马来酸酐0.1％；
所述的电晕层的材料采用聚丙烯(如：上海石化PP聚丙烯塑料粒子F800EDF，可提供良好的电晕润湿张力)和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：聚丙烯75％、乙烯-甲基丙烯酸甲酯共聚物25％。
所述的改性母料由低密度聚乙烯(密度为0.925g/cm3以下)、茂金属聚乙烯(线型)和芥酸酰胺混合而成，各原料占所述电晕层质量百分数分别为：低密度聚乙烯65％，茂金属聚乙烯(线型)20％、芥酸酰胺15％。
上述增韧型蒸煮膜的制备方法如下：
1)按热封层、芯层、增韧层、电晕层所占质量百分数分别为：18％、27％、37％、18％，选取热封层、芯层、增韧层、电晕层的材料；
2)将热封层、芯层、增韧层、电晕层依次层叠布置流延四层共挤，得到增韧型蒸煮膜。
经性能检测，发现制得的上述增韧型蒸煮膜在135℃高温蒸煮70分钟，蒸煮后不破袋漏气，无热变形。市场同类产品热封强度为8N/108度，本发明的热封强度较高(为17N/104度)。现有的蒸煮膜的热封温度一般为110-120℃，本发明的热封温度可降至80-95℃。对本发明的增韧型蒸煮膜进行耐穿刺性实验：用耐穿刺仪实验穿刺本发明的增韧型蒸煮膜，15N，可达到60次穿刺而不破；同样条件下，现有的蒸煮膜穿刺5次就破。本发明穿刺次数多，说明本发明的增韧型蒸煮膜的韧性好，能防割伤、防碰伤，抗穿刺性能优异(耐冲击性优秀)。
实施例2：
如图1所示，本发明提供了一种增韧型蒸煮膜，它由热封层1、芯层2、增韧层3、电晕层4依次层叠布置流延四层共挤而成；所述的热封层、芯层、增韧层、电晕层所占质量百分数分别为：17％、27％、38％、18％；
所述的热封层的材料采用三元无规共聚聚丙烯(PP)树脂、乙烯-醋酸乙烯共聚物(EVA)和改性母料混合而成，各原料占所述热封层的质量百分数分别为：三元无规共聚聚丙烯(PP)树脂40％、乙烯-醋酸乙烯共聚物(EVA)40％、改性母料20％，；
所述的芯层的材料由拉丝级聚丙烯树脂、乙丙弹性体和茂金属聚乙烯(线型)混合而成，各原料占所述芯层的质量百分数分别为：拉丝级聚丙烯树脂50％、乙丙弹性体25％、茂金属聚乙烯25％；
所述的增韧层的材料由拉丝级聚丙烯树脂、乙丙弹性体，高密度聚乙烯，聚酰胺树脂和马来酸酐混合而成，各原料占所述增韧层质量百分数分别为：聚丙烯树脂64.99％、乙丙弹性体5％、高密度聚乙烯20％，聚酰胺树脂10％，马来酸酐0.01％；
所述的电晕层的材料采用聚丙烯(如：上海石化PP聚丙烯塑料粒子F800EDF，可提供良好的电晕润湿张力)和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：聚丙烯85％、乙烯-甲基丙烯酸甲酯共聚物15％。
所述的改性母料由低密度聚乙烯、茂金属聚乙烯(线型)和滑爽剂混合而成，各原料所占质量百分数分别为：低密度聚乙烯75％，茂金属聚乙烯(线型)10％、滑爽剂15％。
上述一种增韧型蒸煮膜的制备方法如下：
1)按热封层、芯层、增韧层、电晕层所占质量百分数分别为：17％、27％、38％、18％，选取热封层、芯层、增韧层、电晕层的材料；
2)将热封层、芯层、增韧层、电晕层依次层叠布置流延四层共挤，得到增韧型蒸煮膜。
经性能检测，发现制得的上述增韧型蒸煮膜在135℃高温蒸煮70分钟，蒸煮后不破袋漏气，无热变形。
市场同类产品热封强度为8N/108度，本发明的热封强度较高(为17N/104度)。
现有的蒸煮膜的热封温度一般为110-120℃，本发明的热封温度可降至80-95℃。
对本发明的增韧型蒸煮膜进行耐穿刺性实验：用耐穿刺仪实验穿刺本发明的增韧型蒸煮膜，15N，可达到60次穿刺而不破；同样条件下，现有的蒸煮膜穿刺5次就破。本发明穿刺次数多，说明本发明的增韧型蒸煮膜的韧性好，能防割伤、防碰伤，抗穿刺性能优异(耐冲击性优秀)。
实施例3：
如图1所示，本发明提供了一种增韧型蒸煮膜，它由热封层1、芯层2、增韧层3、电晕层4依次层叠布置流延四层共挤而成；所述的热封层、芯层、增韧层、电晕层所占质量百分数分别为：18％、26％、38％、18％；
所述的热封层的材料采用三元无规共聚聚丙烯(PP)树脂、乙烯-醋酸乙烯共聚物(EVA)和改性母料混合而成，各原料占所述热封层的质量百分数分别为：三元无规共聚聚丙烯(PP)树脂40％、乙烯-醋酸乙烯共聚物(EVA)50％、改性母料10％，；
所述的芯层的材料由拉丝级聚丙烯树脂、乙丙弹性体和茂金属聚乙烯(线型)混合而成，各原料占所述芯层的质量百分数分别为：拉丝级聚丙烯树脂40％、乙丙弹性体25％、茂金属聚乙烯35％；
所述的增韧层的材料由拉丝级聚丙烯树脂、乙丙弹性体，高密度聚乙烯，聚酰胺树脂和马来酸酐混合而成，各原料占所述增韧层质量百分数分别为：聚丙烯树脂69.8％、乙丙弹性体10％、高密度聚乙烯15％，聚酰胺树脂5％，马来酸酐0.2％；
所述的电晕层的材料为丙烯-乙烯无规共聚物和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：丙烯-乙烯无规共聚物75％、乙烯-甲基丙烯酸甲酯共聚物25％。
所述的改性母料由低密度聚乙烯、茂金属聚乙烯(线型)和滑爽剂混合而成，各原料所占质量百分数分别为：低密度聚乙烯75％，茂金属聚乙烯(线型)20％、滑爽剂5％。
上述一种增韧型蒸煮膜的制备方法如下：
1)按热封层、芯层、增韧层、电晕层所占质量百分数分别为：18％、26％、38％、18％，选取热封层、芯层、增韧层、电晕层的材料；
2)将热封层、芯层、增韧层、电晕层依次层叠布置流延四层共挤，得到增韧型蒸煮膜。
经性能检测，发现制得的上述增韧型蒸煮膜在135℃高温蒸煮70分钟，蒸煮后不破袋漏气，无热变形。
市场同类产品热封强度为8N/108度，本发明的热封强度较高(为17N/104度)。
现有的蒸煮膜的热封温度一般为110-120℃，本发明的热封温度可降至80-95℃。
对本发明的增韧型蒸煮膜进行耐穿刺性实验：用耐穿刺仪实验穿刺本发明的增韧型蒸煮膜，15N，可达到60次穿刺而不破；同样条件下，现有的蒸煮膜穿刺5次就破。本发明穿刺次数多，说明本发明的增韧型蒸煮膜的韧性好，能防割伤、防碰伤，抗穿刺性能优异(耐冲击性优秀)。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (8)

1.一种增韧型蒸煮膜，其特征在于，由热封层、芯层、增韧层、电晕层依次层叠布置流延共挤而成；所述的热封层、芯层、增韧层、电晕层所占质量百分数分别为：17-18％、26-27％、37-38％、17-18％；
所述热封层的材料采用三元无规共聚聚丙烯树脂、乙烯-醋酸乙烯共聚物和改性母料混合而成，各原料占所述热封层的质量百分数分别为：三元无规共聚聚丙烯树脂40-50％、乙烯-醋酸乙烯共聚物40-50％、改性母料10-20％；
所述芯层的材料由拉丝级聚丙烯树脂、乙丙弹性体和线型茂金属聚乙烯混合而成，各原料占所述芯层的质量百分数分别为：拉丝级聚丙烯树脂30-50％、乙丙弹性体25-35％、线型茂金属聚乙烯25-35％；
所述增韧层的材料由拉丝级聚丙烯树脂、乙丙弹性体，高密度聚乙烯，聚酰胺树脂和马来酸酐混合而成，各原料占所述增韧层质量百分数分别为：聚丙烯树脂65-75％、乙丙弹性体5-10％、高密度聚乙烯15-25％，聚酰胺树脂5-10％，马来酸酐0.01-0.2％。
2.根据权利要求1所述的一种增韧型蒸煮膜，其特征在于：所述电晕层的材料采用聚丙烯和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：聚丙烯75-85％、乙烯-甲基丙烯酸甲酯共聚物15-25％。
3.根据权利要求2所述的一种增韧型蒸煮膜，其特征在于：所述的电晕层采用的聚丙烯为上海石化PP聚丙烯塑料粒子F800EDF。
4.根据权利要求1所述的一种增韧型蒸煮膜，其特征在于：所述的电晕层的材料为丙烯-乙烯无规共聚物和乙烯-甲基丙烯酸甲酯共聚物混合而成，各原料占所述电晕层质量百分数分别为：丙烯-乙烯无规共聚物75-85％、乙烯-甲基丙烯酸甲酯共聚物15-25％。
5.根据权利要求1所述的一种增韧型蒸煮膜，其特征在于：所述的热封层的材料中的所述改性母料由低密度聚乙烯、茂金属聚乙烯和滑爽剂混合而成，各原料所占所述改性母料质量百分数分别为：低密度聚乙烯65-75％，茂金属聚乙烯10-20％、滑爽剂5-15％。
6.根据权利要求5所述的一种增韧型蒸煮膜，其特征在于：所述改性母料中的所述爽滑剂为芥酸酰胺。
7.根据权利要求5所述的一种增韧型蒸煮膜，其特征在于：所述低密度聚乙烯的密度为0.925g/cm3以下。
8.一种如权利要求1至7任一项所述的增韧型蒸煮膜的制备方法，其特征在于，包括如下步骤：
1)按所述热封层、芯层、增韧层、电晕层所占质量百分数分别选取热封层、芯层、增韧层、电晕层的材料；
2)将热封层、芯层、增韧层、电晕层依次层叠布置流延共挤，得到增韧型蒸煮膜。
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