CN108263061A - 一种高阻隔易降解绿色包装膜及其制备方法 - Google Patents
一种高阻隔易降解绿色包装膜及其制备方法 Download PDFInfo
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Abstract
一种高阻隔易降解绿色包装膜及其制备方法,属于复合高分子材料中的包装薄膜技术领域。本发明在现有三层共挤聚乙烯薄膜工艺基础上,以疏水改性聚乙烯作为外层,聚乙烯、高阻隔性能的聚乙二醇、聚乙二醇‑聚甲基丙烯酸酯二嵌段共聚物和马来酸酐接枝聚丙烯作为中层,亲水改性的纳米层状氢氧化物作为阻氧层填料和甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物共混改性聚乙烯作为内层,通过三层共挤流延,制得高阻隔易降解绿色包装膜。本发明制备所得包装膜成本低、生产工艺简单、同时兼具优异的氧气和水蒸气阻隔性,且易降解。
Description
技术领域
本发明涉及一种高阻隔易降解绿色包装膜及其制备方法,具体涉及一种高阻隔、易降解三层共挤包装薄膜及其制备方法,属于复合高分子材料中的包装薄膜技术领域。
背景技术
据报道,全世界每人每年平均消耗约90kg的合成聚合物,其中大部分为不可生物降解或回收再利用的。全球每年会生产超过2.7亿吨的塑料,其中1800万吨流入了海洋,目前已经累积了24.4万吨,塑料已成为生态环境的一大灾难。虽然我们使用的塑料袋、塑料瓶等产品中,许多都标记着“可回收”、“可降解”,然而事实上,这些塑料制品的回收程度有限。我国每年生产各类塑料制品占世界消费总量的25%以上,是世界第一生产消费大国。另外,随着人们生活水平的提高,食品种类越来越丰富,对食品的包装要求越来越高,使用高阻隔性薄膜,可防止由于氧气等气体的渗透而引起微生物繁殖;防止由于氧气渗透而引起内容物的氧化;防止香味、溶剂等的渗出,提高内容物的储存性。高阻隔性薄膜,还应具有较强的水汽阻隔性,防止由于水汽的渗透而引起内容物的霉变。因此,如何制备同时兼具高阻隔性能和易降解性的低成本包装薄膜则是包装薄膜技术领域急需解决的问题。
发明内容
本发明的目的在于克服上述不足之处,提供一种高阻隔易降解绿色包装膜及其制备方法,其在现有三层共挤聚乙烯薄膜工艺基础上,以疏水改性聚乙烯作为外层,聚乙烯、高阻隔性能的聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物(PEG-PMMA)和马来酸酐接枝聚丙烯(PP-g-MAH)作为中层,纳米层状氢氧化物作为阻氧层填料和甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物共混改性聚乙烯作为内层,通过三层共挤流延,制得一种高阻隔易降解绿色包装膜。
按照本发明提供的技术方案,在现有三层共挤聚乙烯薄膜工艺基础上,采用聚环己内酯和三硬脂酸甘油酯疏水改性的聚乙烯共混物作为外层;采用聚乙烯、高阻隔性能的聚乙二醇、聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物和马来酸酐接枝聚丙烯作为中层,聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物和马来酸酐接枝聚丙烯除作为相容剂外,其中马来酸酐接枝聚丙烯还具有光降解促进剂的作用;采用亲水改性的纳米层状氢氧化物作为阻氧层填料和甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物共混改性聚乙烯作为内层,纳米级层状氢氧化物不仅起到多层物理阻断氧气通路的作用,同时可以使少量渗入的氧气被增韧剂甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物中的环氧基消耗掉,通过三层共挤流延,制得高阻隔易降解绿色包装膜。
一种高阻隔易降解绿色包装膜,其包括复合在一起的外层薄膜、中层薄膜和内层薄膜;
按质量比计配方如下:
外层薄膜为低密度聚乙烯︰线性低密度聚乙烯︰聚环己内酯︰三硬脂酸甘油酯,比例依次为1︰7~8︰1︰0.1~0.5;
中层薄膜为线性低密度聚乙烯︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯,比例依次为4~5︰3~5︰0.001~0.005︰1;
内层薄膜为低密度聚乙烯︰线性低密度聚乙烯︰纳米层状氢氧化物︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物,比例依次为1︰7~9︰1~2︰0.1~0.5。
进一步地,所述纳米层状氢氧化物为纳米层状氢氧化镁铝或纳米层状氢氧化镁铁。
所述高阻隔易降解绿色包装膜的制备方法,步骤如下:
(1)纳米层状氢氧化物的制备:将摩尔比为5︰1︰1的固体氢氧化钠︰六水合硝酸镁︰九水合硝酸铁或九水合硝酸铝,加入行星球磨机中,在料球比1︰2~5和1︰1.2的转速比下振磨混合反应40~100min,将所得微粉水洗至中性,在真空度5~20kPa、50~70℃下真空干燥30~60min,即得纳米层状氢氧化物;
(2)含亲水改性纳米层状氢氧化物的内层薄膜母粒的制备:按低密度聚乙烯:线性低密度聚乙烯:纳米层状氢氧化物:甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰7~9︰1~2︰0.1~0.5,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒;挤出机各部分操作温度分别为:175~180℃,180~190℃,190~200℃,190~200℃,180~190℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯︰线性低密度聚乙烯︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰7~8︰1 ︰0.1~0.5,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比4~5︰3~5︰0.001~0.005︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和步骤(2)所得内层薄膜母粒分别进行熔融塑化,操作温度为195~225℃,通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为2~15kg/h,收卷速度为0.5~5m/min;挤出机模头是T型模头,T型模头的操作温度为225~235℃,冷却辊冷却温度为10~20℃,得高阻隔易降解绿色包装膜,膜厚0.15~0.96mm,宽度150mm。
进一步地,步骤(3)所述三层共挤流延膜机的内层、中层和外层的挤出螺杆直径为20mm,长径比L/D为30︰1,内层、中层和外层的操作参数设置一致,需要改变时,三层的操作参数同步改变。
进一步地,步骤(2)所述双螺杆挤出机直径为20mm,长径比 L/D为36︰1。
本发明的有益效果:本发明在现有三层共挤聚乙烯薄膜工艺基础上,以疏水改性聚乙烯作为外层,聚乙烯、高阻隔性能的聚乙二醇、聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物和马来酸酐接枝聚丙烯作为中层,聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物和马来酸酐接枝聚丙烯除作为相容剂外,其中马来酸酐接枝聚丙烯还具有光降解促进剂的作用;采用亲水改性的纳米层状氢氧化物作为阻氧层填料和甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物共混改性聚乙烯作为内层,其中纳米级层状氢氧化物不仅起到多层物理阻断氧气通路的作用,同时可以使少量渗入的氧气被增韧剂甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物中的环氧基消耗掉,通过三层共挤流延,制得高阻隔易降解绿色包装膜。所得包装膜成本低、生产工艺简单、同时兼具优异的氧气和水蒸气阻隔性,且易降解。
具体实施方式
下面结合实施例,对本发明作进一步说明,但本发明的应用不限于此。实施例所用同向双螺杆挤出机:KS20,昆山科信橡塑机械有限公司(直径=20mm,长径比L/D=36:1);小型流延膜机(直径=20mm,长径比L/D=30︰1,上海谱展仪器科技有限公司,D-20);行星球磨机:XQM-2L型,北京鑫骉腾达仪器设备有限公司;万能材料试验机:1185,英国Instron公司;
甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物(佳易容相容剂江苏有限公司);马来酸酐接枝聚丙烯(牌号 3290, 美国Addivant);聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物PEG-PMMA(PEG:10500, PMMA:18000,厦门研科生物技术有限公司);低密度聚乙烯(牌号2426H,大庆石化);低密度聚乙烯(牌号2426H,扬巴);线性低密度聚乙烯(牌号7042,吉林石化);线性低密度聚乙烯(牌号7042,抚顺石化);如无特别说明,其它所用原料均为市售商品。
实施例1 高阻隔易降解绿色包装膜的制备
(1)纳米层状氢氧化镁铁的制备:将摩尔比为5︰1︰1的固体氢氧化钠︰六水合硝酸镁︰九水合硝酸铁,加入行星球磨机中,在料球比1︰2和1︰1.2的转速比下振磨混合反应40 min,将所得微粉水洗至中性,在真空度5kPa、50℃下真空干燥30min,即得纳米层状氢氧化镁铁;
(2)含亲水改性纳米层状氢氧化镁铁的内层薄膜母粒的制备:按低密度聚乙烯(牌号2426H,大庆石化) ︰线性低密度聚乙烯(牌号7042,吉林石化)︰纳米层状氢氧化镁铁︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰7︰1︰0.1,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒,挤出机各部分操作温度分别为:175 ℃,180℃, 190 ℃,190 ℃,180 ℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯(牌号2426H,大庆石化)︰线性低密度聚乙烯(牌号7042,吉林石化)︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰7︰1︰0.1,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯(牌号7042,吉林石化)︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比4︰3︰0.001︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和内层薄膜母粒分别进行混合熔融塑化,各部分操作温度为:195、220、225℃;通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为10kg/h,收卷速度为5m/min;挤出机模头是T型模头,T型模头的宽度上的操作温度为:235℃、230℃、225℃、225℃、225℃、230℃、235℃,冷却辊冷却温度为10℃,得高阻隔易降解绿色包装膜,膜厚0.24mm,宽度150mm。
实施例2 高阻隔易降解绿色包装膜的制备
(1)纳米层状氢氧化镁铝的制备:将摩尔比为5︰1︰1的固体氢氧化钠:六水合硝酸镁:九水合硝酸铝,加入行星球磨机中,在料球比1︰5和1︰1.2的转速比下振磨混合反应100 min,将所得微粉水洗至中性,在真空度20kPa、70℃下真空干燥60min,即得纳米层状氢氧化镁铝;
(2)含亲水改性纳米层状氢氧化镁铝的内层薄膜母粒的制备:按低密度聚乙烯(牌号2426H,扬巴) ︰线性低密度聚乙烯(牌号7042,抚顺石化)︰纳米层状氢氧化镁铝︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰9︰2︰0.5,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒,挤出机各部分操作温度分别为:180℃,190℃,200℃,200℃,190℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯(牌号2426H,扬巴)︰线性低密度聚乙烯(牌号7042,抚顺石化)︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰8︰1 ︰0.5,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯(牌号7042,抚顺石化)︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比5︰5︰0.005︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和内层薄膜母粒分别进行混合熔融塑化,各部分操作温度为:195℃、220℃、225℃;通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为2kg/h,收卷速度为0.5m/min;挤出机模头是T型模头,T型模头的宽度上的操作温度为:235℃、230℃、225℃、225℃、225℃、230℃、235℃,冷却辊冷却温度为20℃,得高阻隔易降解绿色包装膜,膜厚0.48mm,宽度150mm。
实施例3 高阻隔易降解绿色包装膜的制备
(1)纳米层状氢氧化镁铁的制备:将摩尔比为5︰1︰1的固体氢氧化钠︰六水合硝酸镁︰九水合硝酸铁,加入行星球磨机中,在料球比1︰3和1︰1.2的转速比下振磨混合反应50 min,将所得微粉水洗至中性,在真空度10kPa、60℃下真空干燥40min,即得纳米层状氢氧化镁铁;
(2)含亲水改性纳米层状氢氧化镁铁的内层薄膜母粒的制备:按低密度聚乙烯(牌号2426H,扬巴) ︰线性低密度聚乙烯(牌号7042,吉林石化):纳米层状氢氧化镁铁︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰8︰1.5︰0.2,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒,挤出机各部分操作温度分别为:180℃,190℃,190℃,200℃,180℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯(牌号2426H,扬巴) ︰线性低密度聚乙烯(牌号7042,吉林石化)︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰7.5︰1 ︰0.3,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯(牌号7042,吉林石化)︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比5︰4︰0.003︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和内层薄膜母粒分别进行混合熔融塑化,各部分操作温度为:195℃、220℃、225℃;通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为5kg/h,收卷速度为4m/min;挤出机模头是T型模头,T型模头的宽度上的操作温度为:235℃、230℃、225℃、225℃、225℃、230℃、235℃,冷却辊冷却温度为12℃,得高阻隔易降解绿色包装膜,膜厚0.15mm,宽度150mm。
实施例4 高阻隔易降解绿色包装膜的制备
(1)纳米层状氢氧化镁铝的制备:将摩尔比为5︰1︰1的固体氢氧化钠︰六水合硝酸镁︰九水合硝酸铝,加入行星球磨机中,在料球比1︰4和1︰1.2的转速比下振磨混合反应70 min,将所得微粉水洗至中性,在真空度15kPa、55℃下真空干燥50min,即得纳米层状氢氧化镁铝;
(2)含亲水改性纳米层状氢氧化镁铝的内层薄膜母粒的制备:按低密度聚乙烯(牌号2426H,大庆石化) ︰线性低密度聚乙烯(牌号7042,抚顺石化)︰纳米层状氢氧化镁铝︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰9︰1︰0.4,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒,挤出机各部分操作温度分别为:175℃,180℃,200℃,200℃,180℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯(牌号2426H,大庆石化)︰线性低密度聚乙烯(牌号7042,抚顺石化)︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰8︰1︰0.1,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯(牌号7042,抚顺石化)︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比5︰3︰0.001︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和内层薄膜母粒分别进行混合熔融塑化,各部分操作温度为:195℃、220℃、225℃;通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为8kg/h,收卷速度为1m/min;挤出机模头是T型模头,T型模头的宽度上的操作温度为:235℃、230℃、225℃、225℃、225℃、230℃、235℃,冷却辊冷却温度为15℃,得高阻隔易降解绿色包装膜,膜厚0.96mm,宽度150mm。
实施例5高阻隔易降解绿色包装膜的制备
(1)纳米层状氢氧化镁铁的制备:将摩尔比为5︰1︰1的固体氢氧化钠:六水合硝酸镁:九水合硝酸铁,加入行星球磨机中,在料球比1︰3和1︰1.2的转速比下振磨混合反应80 min,将所得微粉水洗至中性,在真空度20kPa、65℃下真空干燥35min,即得纳米层状氢氧化镁铁;
(2)含亲水改性纳米层状氢氧化镁铁的内层薄膜母粒的制备:按低密度聚乙烯(牌号2426H,大庆石化) ︰线性低密度聚乙烯(牌号7042,抚顺石化)︰纳米层状氢氧化镁铁︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰7︰2︰0.2,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒,挤出机各部分操作温度分别为:175℃,180℃,200℃,200℃,190℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯(牌号2426H,大庆石化)︰线性低密度聚乙烯(牌号7042,抚顺石化)︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰8︰1︰0.5,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯(牌号7042,抚顺石化)︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比4︰4︰0.003︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和内层薄膜母粒分别进行混合熔融塑化,各部分操作温度为:195℃、220℃、225℃;通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为15kg/h,收卷速度为3m/min;挤出机模头是T型模头,T型模头的宽度上的操作温度为:235℃、230℃、225℃、225℃、225℃、230℃、235℃,冷却辊冷却温度为18℃,得高阻隔易降解绿色包装膜,膜厚0.60mm,宽度150mm。
应用实施例1 实施例1~5所得薄膜制品的力学性能测试
薄膜的拉伸强度按 GB/T 1040.3-2006,使用万能材料试验机进行测试,测试速度为10mm/min,结果见表1。
表1 薄膜的力学性能
应用实施例2 实施例1~5所得薄膜制品的室外自然条件下曝晒降解性能测试
结果见表2。
表2 自然条件下曝晒降解性能(纵向拉伸强度)
应用实施例3 实施例1~5所得薄膜制品的热氧化、生物降解性能及阻隔性能测试
按照美国标准ASTM D5988-03标准进行,将样品模拟垃圾填埋场或堆肥环境,放入70℃热老化箱处理60天,进行生物降解测试;用压差法气体渗透仪器(VAC–V1 型,济南兰光机电技术有限公司)对薄膜的水蒸气透过率和氧气透过率进行测试,结果见表3。
表3 热氧化、生物降解及阻隔性能测试
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员,在不脱离本发明构思的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围内。
Claims (5)
1.一种高阻隔易降解绿色包装膜,其特征在于:其包括复合在一起的外层薄膜、中层薄膜和内层薄膜;
按质量比计配方如下:
外层薄膜为低密度聚乙烯︰线性低密度聚乙烯︰聚环己内酯︰三硬脂酸甘油酯,比例依次为1︰7~8︰1︰0.1~0.5;
中层薄膜为线性低密度聚乙烯︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯,比例依次为4~5︰3~5︰0.001~0.005︰1;
内层薄膜为低密度聚乙烯︰线性低密度聚乙烯︰纳米层状氢氧化物︰甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物,比例依次为1︰7~9︰1~2︰0.1~0.5。
2.根据权利要求1所述高阻隔易降解绿色包装膜,其特征在于:所述纳米层状氢氧化物为纳米层状氢氧化镁铝或纳米层状氢氧化镁铁。
3.权利要求1所述高阻隔易降解绿色包装膜的制备方法,其特征在于步骤如下:
(1)纳米层状氢氧化物的制备:将摩尔比为5︰1︰1的固体氢氧化钠︰六水合硝酸镁︰九水合硝酸铁或九水合硝酸铝,加入行星球磨机中,在料球比1︰2~5和1︰1.2的转速比下振磨混合反应40~100min,将所得微粉水洗至中性,在真空度5~20kPa、50~70℃下真空干燥30~60min,即得纳米层状氢氧化物;
(2)含亲水改性纳米层状氢氧化物的内层薄膜母粒的制备:按低密度聚乙烯:线性低密度聚乙烯:纳米层状氢氧化物:甲基丙烯酸缩水甘油酯接枝辛烯乙烯共聚物的质量比1︰7~9︰1~2︰0.1~0.5,进行配料混合,混合料放入双螺杆挤出机中熔融造粒,得到内层薄膜母粒;挤出机各部分操作温度分别为:175~180℃,180~190℃,190~200℃,190~200℃,180~190℃;
(3)高阻隔易降解绿色包装膜的制备:外层薄膜组分配比:按低密度聚乙烯︰线性低密度聚乙烯︰聚环己内酯︰三硬脂酸甘油酯的质量比1︰7~8︰1 ︰0.1~0.5,配制外层混合料;中层薄膜组分配比:按线性低密度聚乙烯︰聚乙二醇︰聚乙二醇-聚甲基丙烯酸酯二嵌段共聚物︰马来酸酐接枝聚丙烯的质量比4~5︰3~5︰0.001~0.005︰1,配制中层混合料;分别在搅拌机中混合,然后在三层共挤流延膜机上,将外层混合料、中层混合料和步骤(2)制备所得内层薄膜母粒分别进行熔融塑化,操作温度为195~225℃,通过三层共挤流延膜机共挤出流延,外层︰中层︰内层的挤出转速比为1︰1︰1,共挤出量为2~15kg/h,收卷速度为0.5~5m/min;挤出机模头是T型模头,T型模头的操作温度为225~235℃,冷却辊冷却温度为10~20℃,得高阻隔易降解绿色包装膜,膜厚0.15~0.96mm,宽度150mm。
4.根据权利要求3所述高阻隔易降解绿色包装膜的制备方法,其特征在于:步骤(3)所述三层共挤流延膜机的内层、中层和外层的挤出螺杆直径为20mm,长径比L/D为30︰1,内层、中层和外层的操作参数设置一致,需要改变时,三层的操作参数同步改变。
5.根据权利要求3所述高阻隔易降解绿色包装膜的制备方法,其特征在于:步骤(2)所述双螺杆挤出机直径为20mm,长径比 L/D为36︰1。
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