CN110733217A - 一种单向拉伸多层共挤聚乙烯扭结膜 - Google Patents
一种单向拉伸多层共挤聚乙烯扭结膜 Download PDFInfo
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Abstract
一种单向拉伸多层共挤聚乙烯扭结膜,包括表层、芯层和内层,表层由高密度聚乙烯、线性低密度聚乙烯及乙烯‑α烯烃共聚物混合组成,芯层由高密度聚乙烯为载体,添加抗静电母料、抗黏连母料,内层由高密度聚乙烯、线性低密度聚乙烯及乙烯‑α烯烃共聚物混合组成,表层和内层的树脂190℃的熔体流动速率为0.2~1g/10min,芯层载体树脂190℃的的熔体流动速率7~10g/10min。将三层物料放入三台不同的挤出机熔融,经过层分配器进入模具,流延冷却成片材,再进一步冷却送入纵向拉伸机进行单向拉伸,制备的扭结膜密度小,透明度高,气密、耐油、防腐、防潮、印刷、焊接性能好,包装扭结回弹力小,有广泛的应用前景。
Description
技术领域
本发明涉及一种薄膜材料和其制备方法,具体的是一种一种单向拉伸多层共挤聚乙烯扭结膜及其制备方法。
背景技术
扭结膜是食品包装中应用极为广泛的复合软包装材料,在糖果、蜜饯果丹类等棒状或圆柱状的产品中,经常应用到扭结包装膜。目前市场上常用的扭结膜包括聚氯乙烯(PVC)扭结膜、聚酯(PET)扭结膜、聚苯乙烯(BOPS)扭结膜、双向拉伸聚丙烯(BOPP)复合镀铝扭结膜、玻璃纸等5大类。在此5种结构中,传统的玻璃纸由于生产过程对环境造成极大影响,且价格较高,考虑到材料成本和物料供给的稳定性,故不选用玻璃纸。PVC扭结膜具有良好的化学稳定性,不易被酸碱侵蚀,但对光、热、紫外线灯不稳定,耐热温度低,若加热温度高易放出氯化氢和析出增塑剂,影响内装物质的质量,且PVC难以回收再利用。PET扭结膜、双向拉伸聚丙烯(BOPP)复合镀铝扭结膜在环保角度上优于PVC扭结膜,但其密度大,成本高,扭结性能差。BOPS扭结膜刚性较大,易发脆,推广困难。因此,开发一种符合环保要求,成本适中,扭结性能良好的扭结包装材料已势在必行。
发明内容
本发明的目的在于为了克服现有技术存在的缺陷而提供一种加工容易、性价比高、扭结性好的单向拉伸多层共挤聚乙烯扭结膜及制备方法。
本发明的技术方案如下:
一种单向拉伸多层共挤聚乙烯扭结膜,包括表层、芯层和内层,
第一层为表层,由高密度聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物混合组成,其中,
高密度聚乙烯 50-70%重量比
线性低密度聚乙烯 15-30%重量比
乙烯-α烯烃共聚物 15-30%重量比;
第二层为芯层,由高密度聚乙烯为载体,添加抗静电母料、抗黏连母料,其中,
高密度聚乙烯 85-95%重量比
抗静电母料 1-10%重量比
抗黏连母料 1-10%重量比
第三层为内层,由高密度聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物混合组成,其中,
高密度聚乙烯 50-70%重量比
线性低密度聚乙烯 15-30%重量比
乙烯-α烯烃共聚物 15-30%重量比。
其中,表层和内层的树脂190℃的熔体流动速率为0.2~1g/10min。
其中,芯层载体树脂190℃的的熔体流动速率优选7~10g/10min。
其中,芯层的抗静电剂为聚乙烯食品包装用无胺型抗静电剂。
其中,内层的聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物均采用食品级。
优选的,外层和内层,高密度聚乙烯重量比为60-65%,线性低密度聚乙烯重量比为15-25%,乙烯-α烯烃共聚物重量比为15-25%。
更为优选的,高密度聚乙烯的重量比为65%,线性低密度聚乙烯重量比为15%,乙烯-α烯烃共聚物重量比为20%。
本发明所选树脂熔体流动速率,以及其优选方法的目的,主要基于所选树脂熔体流动速率在该范围内,树脂的分子量分布适中,树脂熔融混合后熔体能成均一状态,便于进行单向拉伸。另一方面所选树脂熔体流动速率在该范围内,分子量偏高,单向拉伸生产稳定性较好,能满足大倍率取向,所选树脂混合一是在纵向形成高的拉伸强度,二是在横向能保持较高的断裂伸长率,在包装过程中不易产生横向开裂。本发明所称的脂熔体流动速率是按照GB/T 3682-2000的方法,在190摄氏度,2.16Kg载荷的条件下测量的。
本发明还提供一种单向拉伸多层共挤聚乙烯扭结膜的制备方法,采用如下步骤:
(1)按照前述的配方的内容,准备表层、芯层、内层物料,
(2)将三层物料放入三台不同的挤出机熔融,经过层分配器进入模具,流延冷却成片材,再进一步冷却送入纵向拉伸机进行单向拉伸,其中,纵向拉伸机包括预热区、拉伸区、定型区和冷却区,预热区有3组预热辊,辊筒直径为300~400mm,结构为夹套式镜面辊,内部通导热油;
拉伸区有4组拉伸辊,其中2组辊筒组成低速辊,辊筒直径为180~200mm,结构为夹套式镜面辊,内部通导热油;2组辊筒组成高速辊,辊筒直径为180~200mm,一组结构为夹套式镜面辊,另一组为橡胶辊,内部通导热油;
定型区有2组定型辊,辊筒直径为300~400mm,结构为夹套式镜面辊,内部通导热油;冷却区有1组预热辊,辊筒直径为300~400mm,结构为夹套式镜面辊,内部通冷却水。
(3)将单向拉伸的薄膜表面处理后送入牵引和收卷卷取。
其中,挤出机长径比为28~35,;挤出机几何压缩比为2~4;挤出机的加工温度在170~250℃,层分配器及模具温度在210~235℃,拉伸温度在95~135℃,定型温度为125~130℃,拉伸倍数为大倍率拉伸,范围为5.8~8倍,拉伸间隙为小间隙,控制范围为2~3mm,低速辊与高速辊的速度比值为拉伸倍数,低速辊与高速辊的间距为拉伸间隙。
优选的,挤出机几何压缩比为3。
优选的,挤出机长径比为33。
其中,层分配器的作用是调解表层、芯层和内层的比例。
有益效果:(1)与现有技术相比,本发明的优点在于采用多层共挤聚乙烯使得扭结膜的密度小,透明度高和气密、耐油、防腐、防潮、印刷、焊接性能好,包装扭结回弹力小。
(2)本发明通过将多层共挤聚乙烯进行单向拉伸使得扭结膜在纵向获得较高的力学性能,而且横向也具有较好的断裂伸长率,使得横向不易开裂,能满足糖果包装机器的高速性。
(3)本发明所生产扭结膜能回收再利用,生产过程中无废气、废料、废水产生,对环境无不利影响。
附图说明
图1是本发明的三层结构示意图
其中1是表层,2是芯层,3是内层。
具体实施方式
实施例1
(1)表层物料的配方为:以该层树脂的总重量100%计,高密度聚乙烯树脂(牌号HM5000)60%,线性低密度聚乙烯(牌号7042)20%,乙烯-α烯烃共聚物(牌号8150)20%;
(2)芯层物料的配方为:以该层树脂的总重量100%计,高密度聚乙烯树脂(牌号HM5000)95%,抗静电母料4%,抗黏连母料1%;
(3)内层物料的配方为:以该层树脂的总重量100%计,食品级高密度聚乙烯树脂(牌号8003)60%,食品级线性低密度聚乙烯(牌号7050)20%,食品级乙烯-α烯烃共聚物(牌号8003)20%;
(4)将表层、芯层、内层物料各自混合均匀后加入三台不同的挤出机熔融,挤出机长径比为33,压缩比为3,加工温度为180~240℃,表层、芯层、内层主机速度为50rpm、60rpm、50rpm;熔体经过层分配器进入模具挤出片材,层分配器及模具温度为220~230℃;片材冷却后进入纵向拉伸,拉伸温度为90~128℃,拉伸倍数为6倍;薄膜经过表面处理后进行卷取。薄膜最终厚度为20μm,其中表层、芯层、内层比例为15%、65%、20%。
(5)按照标准GB/T 1401-2006进行拉伸侧能测试,测得拉伸强度(纵向)为140MPa,断裂伸长率(纵向)为50%,横向断裂伸长率大于800%。
实施例2
(1)表层物料的配方为:以该层树脂的总重量100%计,高密度聚乙烯树脂(牌号HM5000)60%,线性低密度聚乙烯(牌号7042)25%,乙烯-α烯烃共聚物(牌号8150)15%;
(2)芯层物料的配方为:以该层树脂的总重量100%计,高密度聚乙烯树脂(牌号HM5000)94%,抗静电母料4%,抗黏连母料2%;
(3)内层物料的配方为:以该层树脂的总重量100%计,食品级高密度聚乙烯树脂(牌号8003)60%,食品级线性低密度聚乙烯(牌号7050)25%,食品级乙烯-α烯烃共聚物(牌号8003)15%;
(4)将表层、芯层、内层物料各自混合均匀后加入三台不同的挤出机熔融,挤出机长径比为33,压缩比为3,加工温度为180~240℃,表层、芯层、内层主机速度为50rpm、60rpm、50rpm;熔体经过层分配器进入模具挤出片材,层分配器及模具温度为220~230℃;片材冷却后进入纵向拉伸,拉伸温度为90~128℃,拉伸倍数为6.5倍;薄膜经过表面处理后进行卷取。薄膜最终厚度为20μm,其中表层、芯层、内层比例为15%、70%、15%。
(5)按照标准GB/T 1401-2006进行拉伸侧能测试,测得拉伸强度(纵向)为160MPa,断裂伸长率(纵向)为40%,横向断裂伸长率大于700%。
实施例3
(1)表层物料的配方为:以该层树脂的总重量100%计,高密度聚乙烯树脂(牌号HM5000)70%,线性低密度聚乙烯(牌号7042)15%,乙烯-α烯烃共聚物(牌号8150)15%;
(2)芯层物料的配方为:以该层树脂的总重量100%计,高密度聚乙烯树脂(牌号HM5000)94%,抗静电母料5%,抗黏连母料1%;
(3)内层物料的配方为:以该层树脂的总重量100%计,食品级高密度聚乙烯树脂(牌号8003)60%,食品级线性低密度聚乙烯(牌号7050)15%,食品级乙烯-α烯烃共聚物(牌号8003)25%;
(4)将表层、芯层、内层物料各自混合均匀后加入三台不同的挤出机熔融,挤出机长径比为33,压缩比为3,加工温度为180~240℃,表层、芯层、内层主机速度为50rpm、60rpm、50rpm;熔体经过层分配器进入模具挤出片材,层分配器及模具温度为220~230℃;片材冷却后进入纵向拉伸,拉伸温度为90~128℃,拉伸倍数为6倍;薄膜经过表面处理后进行卷取。薄膜最终厚度为20μm,其中表层、芯层、内层比例为15%、70%、15%。
(5)按照标准GB/T 1401-2006进行拉伸侧能测试,测得拉伸强度(纵向)为150MPa,断裂伸长率(纵向)为45%,横向断裂伸长率大于700%。
本发明所述的实施例并不限于以上所述实施例,通过前述公开的数值范围,在就具体实施例中进行任意替换,从而可以得到无数个实施例,对此不一一例举。
Claims (9)
1.一种单向拉伸多层共挤聚乙烯扭结膜,包括表层、芯层和内层,其特征在于,
第一层为表层,由高密度聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物混合组成,其中,
高密度聚乙烯 50-70%重量比
线性低密度聚乙烯 15-30%重量比
乙烯-α烯烃共聚物 15-30%重量比;
第二层为芯层,由高密度聚乙烯为载体,添加抗静电母料、抗黏连母料,其中,
高密度聚乙烯 85-95%重量比
抗静电母料 1-10%重量比
抗黏连母料 1-10%重量比
第三层为内层,由高密度聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物混合组成,其中,
高密度聚乙烯 50-70%重量比
线性低密度聚乙烯 15-30%重量比
乙烯-α烯烃共聚物 15-30%重量比。
2.根据权利要求1所述的单向拉伸多层共挤聚乙烯扭结膜,其特征在于,表层和内层的树脂190℃的熔体流动速率为0.2~1g/10min。
3.根据权利要求1或2所述的单向拉伸多层共挤聚乙烯扭结膜,其特征在于,芯层载体树脂190℃的的熔体流动速率优选7~10g/10min。
4.根据权利要求1所述的单向拉伸多层共挤聚乙烯扭结膜,其特征在于,芯层的抗静电剂为聚乙烯食品包装用无胺型抗静电剂。
5.根据权利要求1或4所述的单向拉伸多层共挤聚乙烯扭结膜,其特征在于,内层的聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物均采用食品级。
6.根据权利要求1所述的单向拉伸多层共挤聚乙烯扭结膜,其特征在于,所述的外层和内层,高密度聚乙烯重量比为60-65%,线性低密度聚乙烯重量比为15-25%,乙烯-α烯烃共聚物重量比为15-25%。
7.一种单向拉伸多层共挤聚乙烯扭结膜的制备方法,采用如下步骤:
(1)准备表层、芯层、内层物料,
表层,由高密度聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物混合组成,其中,
高密度聚乙烯 50-70%重量比
线性低密度聚乙烯 15-30%重量比
乙烯-α烯烃共聚物 15-30%重量比;
芯层,由高密度聚乙烯为载体,添加抗静电母料、抗黏连母料,其中,
高密度聚乙烯 85-95%重量比
抗静电母料 1-10%重量比
抗黏连母料 1-10%重量比
内层,由高密度聚乙烯、线性低密度聚乙烯及乙烯-α烯烃共聚物混合组成,其中,
高密度聚乙烯 50-70%重量比
线性低密度聚乙烯 15-30%重量比
乙烯-α烯烃共聚物 15-30%重量比;
(2)将三层物料放入三台不同的挤出机熔融,经过层分配器进入模具,流延冷却成片材,再进一步冷却送入纵向拉伸机进行单向拉伸,其中,纵向拉伸机包括预热区、拉伸区、定型区和冷却区,预热区有3组预热辊,辊筒直径为300~400mm,结构为夹套式镜面辊,内部通导热油;
拉伸区有4组拉伸辊,其中2组辊筒组成低速辊,辊筒直径为180~200mm,结构为夹套式镜面辊,内部通导热油;2组辊筒组成高速辊,辊筒直径为180~200mm,一组结构为夹套式镜面辊,另一组为橡胶辊,内部通导热油;
定型区有2组定型辊,辊筒直径为300~400mm,结构为夹套式镜面辊,内部通导热油;冷却区有1组预热辊,辊筒直径为300~400mm,结构为夹套式镜面辊,内部通冷却水;
(3)将单向拉伸的薄膜表面处理后送入牵引和收卷卷取;
其中,挤出机长径比为28~35,;挤出机几何压缩比为2~4;挤出机的加工温度在170~250℃,层分配器及模具温度在210~235℃,拉伸温度在95~135℃,定型温度为125~130℃,拉伸倍数为大倍率拉伸,范围为5.8~8倍,拉伸间隙为小间隙,控制范围为2~3mm,低速辊与高速辊的速度比值为拉伸倍数,低速辊与高速辊的间距为拉伸间隙。
8.根据权利要求7所述的单向拉伸多层共挤聚乙烯扭结膜的制备方法,其特征在于,挤出机几何压缩比为3。
9.根据权利要求7所述的单向拉伸多层共挤聚乙烯扭结膜的制备方法,其特征在于,挤出机长径比为33。
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