CN116118305A - 一种高摩擦系数流延聚丙烯薄膜及其制备方法 - Google Patents
一种高摩擦系数流延聚丙烯薄膜及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种高摩擦系数流延聚丙烯薄膜及其制备方法,属于功能性薄膜材料技术领域。薄膜由上至下依次由电晕层、中间层和热封层组成;电晕层主料为三元共聚聚丙烯,辅料为丙烯‑乙烯‑丁烯三元聚合物、乙烯‑丁烯高聚物或乙烯‑辛烯高聚物、合成硅石类防粘剂;中间层包括拉丝级聚丙烯和聚烯烃弹性体,热封层均聚注塑级聚丙烯树脂。本发明严格控制电晕层中主料与辅料的配比,避免出现由于爽滑剂迁移而降低摩擦系数的问题,使摩擦系数能达到0.6‑0.8,并且辅料还能作为成核剂改善主料聚丙烯的结晶性能,增强力学性能,显示出更高的耐磨性。
Description
技术领域
本发明涉及一种高摩擦系数流延聚丙烯薄膜及其制备方法,属于功能性薄膜材料技术领域。
背景技术
功能性薄膜指用聚氯乙烯、聚乙烯、聚丙烯、聚苯乙烯以及其他树脂制成的薄膜,在中国的产量约占中国塑料制品总产量的20%,是塑料制品中产量增长最快的类别,其广泛地应用于食品包装、医药包装、文化用品包装及农产品采后包装等领域。
在实际应用中发现,制备生产的功能性薄膜存在易拉断、打滑、包装生产线断流等问题,而这些问题的出现首先需要从摩擦系数上进行查找。摩擦系数是量度塑料功能性薄膜滑动特性的一项重要指标,薄膜材料表面爽滑并具有适当的摩擦系数对于薄膜包装工艺来说非常重要,生产不同用途的包装材料对摩擦系数的要求也不尽相同,当内层摩擦系数过小时,有可能引起制袋成型时叠料不稳定而产生错边,外层摩擦系数过小可能引起拖动结构打滑造成电眼跟踪和切段定位不准,影响包装效率。
中国专利CN104015448A公开了一种摩擦系数可控的流延聚丙烯薄膜及其制备方法,其制备的薄膜中高分子爽滑剂均匀的分散在热封层,由于爽滑剂分子质量高,与主体树脂的相容性好,不会造成因为储存或使用环境温度高低变化发生迁移,不会影响薄膜表面摩擦系数的变化;中国专利CN106113856A公开了一种未拉伸聚丙烯薄膜,其不使用爽滑剂成分制备得到了动摩擦系数为0.7的未拉伸聚丙烯薄膜,可用于食品包装行业;中国专利CN114456501A公开了一种超高耐磨型BOPP薄膜及其制备方法,其在表层加入高对称度柔性分子链结构的助剂,减小了烟膜表面摩擦时的剪切力,实现较低摩擦系数,提高薄膜耐磨性。
当采用聚丙烯薄膜制备低温充气食品包装,由于食品体积小,生产速率高,要求包装薄膜的摩擦系数高;同时聚丙烯薄膜在自动封装过程中容易出现打滑现象,因此迫切需要一种高摩擦系数的聚丙烯薄膜满足高速生产的需求。同时高摩擦系数的聚丙烯薄膜在进行印刷包装时,油墨可以更好的附着在聚丙烯薄膜的表面,防止因油墨附着力不足造成的印刷错误。
发明内容
本发明提供了一种高摩擦系数流延聚丙烯薄膜及其制备方法,其能够避免薄膜在制备低温充气食品包装的自动封装过程中打滑,提高封装效率。
本发明采用的技术方案如下:
一种高摩擦系数流延聚丙烯薄膜,由电晕层、中间层和热封层组成;其中电晕层由30%-50%主料三元共聚聚丙烯及50%-70%辅料组成;
中间层由95%-99%拉丝级聚丙烯和1%-5%聚烯烃弹性体组成;
热封层为均聚注塑级聚丙烯树脂。
优选的,三元共聚聚丙烯为PP TF402或PP TF400。
优选的,辅料为由丙烯-乙烯-丁烯三元聚合物,POE和爽滑剂组成,其中三种辅料配比为41:10:8。
进一步优选的,丙烯-乙烯-丁烯三元聚合物为PP TF400或PP C5908,POE为5980FL,爽滑剂为AB6018PP。
优选的,电晕层,中间层与热封层的厚度比为3:8:3,三层的总厚度为28μm。
一种高摩擦系数流延聚丙烯薄膜的制备方法,具体包括以下步骤:
(1)将各种原料混合均匀后进行洁净计量下料,冲料至晶点直径在0.5-1.5mm之间,数量在30个/1000m2以下;
(2)程序式控温:设置熔融挤出机的温度为180-250℃,过滤器、传输管道、分配器以及T型模头的温度为220-240℃;
(3)将混合物料通过挤出机螺杆熔融剪切塑化,得到熔体;
(4)将熔体通过碟片式过滤器进行二次过滤;
(5)将过滤后的熔体进入通过分配器按照不同比例进行挤出分配,经过T型模头后流延,然后冷却结晶,定型成膜,其中,挤出量为580-620kg/h,流延速度为180-220m/min;
(6)测量并调整厚度,再在功率为25-35W/(m2/min)、电晕张力为60-70N/m、电晕压辊压力为0.4-0.5bar、中央驱动55±10N条件下对薄膜表面进行电晕处理后经牵引收卷成膜,其中收卷宽度为1700-3500mm;
本发明的有益效果在于:本发明制备得到了一种摩擦系数可以达到0.6-0.8的流延聚丙烯薄膜,适用于制备低温充气食品小包装,防止因摩擦系数较低而造成的在自动封装过程中出现打滑现象,提高自动封装速率。同时高摩擦系数的流延聚丙烯薄膜可以保证在印刷包装的过程中油墨更好的附着在薄膜上,提高印刷成品率。本发明通过控制电晕层中主料与辅料的配比,防止了由于爽滑剂迁移而造成薄膜摩擦系数降低,制备得到了具有良好的力学性能的聚丙烯薄膜包装材料。
附图说明
图1为本发明制备的高摩擦系数流延聚丙烯薄膜的结构示意图,图中1为电晕层,2为中间层,3为热封层。
具体实施方式
下述实施例中采用的原料分别为:
电晕层所用主料的成分为三元共聚聚丙烯,型号为TF402或TF400;
电晕层辅料1的成分为丙烯-乙烯-丁烯三元聚合物的型号为,型号为C5908或TF400,熔体质量流动速率8g/10min,拉伸屈服应力20MPa,维卡软化点113℃,弯曲模量600MPa,负荷变形温度(0.45MPa)56℃,洛氏硬度80R,雾度2.0%,熔融温度130℃,起始热封温度113℃;
电晕层辅料2为POE,型号为3980FL,熔体质量流动速率0.50g/10min,拉伸模量2.60MPa,抗张强度9.50MPa,断裂伸长率810%,维卡软化温度46.0℃,溶融温度55.0℃;
爽滑剂的型号为AB6018,成分为合成硅石类防粘剂;
拉丝级聚丙烯的型号为T03,其熔体质量流动速率为2.8g/10min,断裂伸长率为221.5%,屈服强度为33.9MPa,等规指数为97.6%;
聚烯烃弹性体的型号为6102FL,其密度为0.862g/cm3,熔融指数(190℃/2.16Kg)为1.4g/10min,其乙烯成分占16wt%,硬度为67,拉伸断裂强度>7.6MPa,拉伸率>800%,维卡软化温度为53.9℃。
均聚注塑级聚丙烯树脂的型号为V30G,其熔融指数为14.6g/10min,拉伸屈服强度为33.7MPa,等规指数为96.6%,黄色指数为2.6,颗粒外观为0.5g/kg,具有高等规度、较高流动性、低灰分等优点。
实施例1
一种高摩擦系数流延聚丙烯复合膜及其制备方法,具体包括以下步骤:
(1)原料预处理:将各原料进行洁净处理,冲料至晶点直径在0.5-15mm,晶点数量在30个/1000m2以下;
(2)将处理后各原料投入计量料斗按比例混合,然后分别进入相应的挤出机进行加压熔融塑化,得到熔体,其中控制挤出机A、B和C的入料口温度为35℃,1区、2区、3区温度为180℃、235℃和245℃;
(3)将塑化后的熔体通过碟片式过滤器进行过滤,其中过滤器的温度为220℃;
(4)将过滤后熔体通过分配器按照比例进行分配,通过T型模头三层共挤挤出,高速流延,冷却结晶成膜;其中挤出量为580kg/h,分配器和T型模头的温度为220℃,流延速度为180m/min;
(5)对步骤(4)得到的薄膜进行厚度测量,然后在电晕功率为25W/(m2/min),电晕张力为60N/m,电晕压辊压力为0.4bar,中央驱动55±10N条件下对电晕层表面进行电晕处理,然后经牵引收卷成膜,其中收卷宽度为1700-3500mm膜的收卷速度为80m/min;
(6)将薄膜静置24h后分切成适宜宽度,去除接头,电晕层朝内进行包装避免粉尘污染,然后打上表示与代号,废料集中打包回收。
具体配方比例如表1所示:
表1高摩擦系数流延聚丙烯薄膜配方表
实施例2
方法、步骤同实施例1,其中步骤(4)中的挤出量为600kg/h,分配器和T型模头的温度为230℃,流延速度为200m/min;
步骤(5)中的电晕功率为30W/(m2/min),电晕张力为65N/m,电晕压辊压力为0.45bar;
各原料的配方见表2:
表2高摩擦系数流延聚丙烯薄膜配方表
实施例3
方法、步骤同实施2,各原料的配方见表3:
表3高摩擦系数流延聚丙烯薄膜配方表
实施例4
方法、步骤同实施2,各原料的配方见表4:
表4高摩擦系数流延聚丙烯薄膜配方表
实施例5
方法、步骤同实施2,各原料的配方见表5:
表5高摩擦系数流延聚丙烯薄膜配方表
实施例6
方法、步骤同实施例1,其中步骤(4)中的挤出量为620kg/h,分配器和T型模头的温度为240℃,流延速度为220m/min;
步骤(5)中的电晕功率为35W/(m2/min),电晕张力为70N/m,电晕压辊压力为0.5bar;
各原料的配方见表6:
表6高摩擦系数流延聚丙烯薄膜配方表
对比例1
方法、步骤同实施例2,配方见表7:
表7高摩擦系数流延聚丙烯薄膜配方表
原料 | 配比 | 厚度 | |
挤出机A | 拉丝级聚丙烯 | 100% | 16μm |
挤出机B | 三元共聚聚丙烯TF402 | 100% | 6μm |
挤出机C | 聚丙烯树脂 | 100% | 6μm |
对比例2
方法、步骤同实施例2,配方见表8:
表8高摩擦系数流延聚丙烯薄膜配方表
对比例3
方法、步骤同实施例2,配方见表9:
表9高摩擦系数流延聚丙烯薄膜配方表
结果检测:取实施例1-6和对比例1-3制备得到的流延聚丙烯薄膜,根据GB 1006-88和QB/T 1125-2000等标准进行测试,检测其力学性能和摩擦系数等性能,结果见表10:
表10各实施例制备得到的流延聚丙烯薄膜的性能测试结果
从表10中的数据可以看出,相对于对比例1-3,实施例1-6制备得到的聚丙烯薄膜的摩擦系数可以达到0.7左右,且断裂伸长率等力学性能更强更稳定,因此能够满足低温充气包装的高速封装生产。
上述实施例仅为本发明的优选实施例,而不应理解为对本发明的限制,本发明的保护范围应当以权利要求记载的内容为准。本领域技术人员在不做出创造性劳动的前提下进行等同替换所得到的技术方案均属于本发明的保护范围之内。
Claims (10)
1.一种高摩擦系数流延聚丙烯薄膜,其特征在于:所述薄膜由电晕层、中间层和热封层组成,其中电晕层由30%-50%主料三元共聚聚丙烯及50%-70%辅料组成;
中间层由95%-99%拉丝级聚丙烯和1%-5%聚烯烃弹性体组成;
热封层为注塑级聚丙烯树脂。
2.根据权利要求1所述的一种高摩擦系数流延聚丙烯薄膜,其特征在于:所述三元共聚聚丙烯为PP TF402或PP TF400。
3.根据权利要求1所述的一种高摩擦系数流延聚丙烯薄膜,其特征在于:所述辅料为由丙烯-乙烯-丁烯三元聚合物,POE和爽滑剂组成,其中三种辅料配比为41:10:8。
4.根据权利要求3所述的一种高摩擦系数流延聚丙烯薄膜,其特征在于:所述丙烯-乙烯-丁烯三元聚合物为PP TF400或PP C5908,POE为5980FL,爽滑剂为AB6018PP。
5.根据权利要求1所述的一种高摩擦系数流延聚丙烯薄膜,其特征在于:所述电晕层,中间层与热封层的厚度比为3:8:3,三层的总厚度为28μm。
6.一种高摩擦系数流延聚丙烯薄膜的制备方法,其特征在于:包括以下步骤:
(1)将各种原料混合均匀后进行洁净计量下料,冲料至晶点达到要求;
(2)程序式控温:设置熔融挤出机、过滤器、传输管道、分配器以及T型模头的温度;
(3)将混合物料通过挤出机螺杆熔融剪切塑化,得到熔体;
(4)将熔体通过碟片式过滤器进行二次过滤;
(5)将过滤后的熔体进入通过分配器按照不同比例进行分配,经过T型模头后流延,然后冷却结晶,定型成膜;
(6)测量并调整厚度,表面电晕处理后经牵引收卷成膜;
(7)静置24h后分切、去除接头后包装。
7.根据权利要求6所述的一种高摩擦系数流延聚丙烯薄膜的制备方法,其特征在于:步骤(1)所述的晶点的要求为直径为0.5-1.5mm,数量在30个/1000m2以下。
8.根据权利要求6所述的一种高摩擦系数流延聚丙烯薄膜的制备方法,其特征在于:步骤(2)所述的挤出机的温度为180-250℃,分配器和T型模头的温度为220-240℃。
9.根据权利要求6所述的一种高摩擦系数流延聚丙烯薄膜的制备方法,其特征在于:步骤(5)所述的流延的速度为180-220 m/min,挤出量为580-620kg/h。
10.根据权利要求6所述的一种高摩擦系数流延聚丙烯薄膜的制备方法,其特征在于:步骤(6)所述表面电晕处理的功率为25-35 W/(m2/min),电晕张力为60-70N/m,电晕压辊压力为0.4-0.5bar,中央驱动为55±10N,收卷宽度为1700-3500mm。
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