CN107351496B - 一种高阻隔型双向拉伸共挤薄膜及制备方法 - Google Patents
一种高阻隔型双向拉伸共挤薄膜及制备方法 Download PDFInfo
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Abstract
本发明公开了一种高阻隔型双向拉伸共挤薄膜及其制备方法,该薄膜由上表层、上中层、芯层、下中层和下表层组成,所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物和液体抗静电剂构成,所述液体抗静电剂的质量占芯层总质量的1‑3%;所述阻隔层是由改性丙烯腈树脂和抗粘连母料构成,所述抗粘连母料的质量占阻隔层总质量的1‑6%;所述粘合层由乙烯‑醋酸乙烯共聚物构成。本发明薄膜有五层结构,其上、下表层为具有阻隔性能的树脂,经过挤出双向拉伸制成阻隔膜,减少了涂布机等后续加工设备的投入,具有加工简单、成本低的优点,同时避免了涂布过程中存在溶剂污染和能源消耗等问题。
Description
技术领域
本发明涉及薄膜技术领域,具体涉及一种高阻隔型双向拉伸共挤薄膜及制备方法。
背景技术
我国市场高阻隔性塑料包装材料已经成为塑料包装材料的重要发展方向之一,现在已经开发出多种性能优异的新型高阻隔性材料,这些新型材料将会在食品和医药等包装方面得到广泛应用。
高阻隔膜是指保护包装内容物、避免污染物和氧气、水蒸气、液体及气味等小分子物质渗入,同时也能够防止包装内容物渗出的包装薄膜。高阻隔膜的高阻隔性是指在23℃、65%相对湿度的标准状态下,氧气的透过量<5ml/M2Day,水蒸汽的透过量<2g/M2Day。
对于传统的阻隔膜如PVDC涂布膜等,存在阻隔性受环境温湿度影响较大、废弃物易产生污染、须使用专门涂布设备增加成本等问题,使得阻隔膜发展受到限制。
发明内容
本发明的目的是提供一种高阻隔型双向拉伸共挤薄膜及其制备方法。
本发明主要技术方案为:
一种高阻隔型双向拉伸共挤薄膜,该薄膜由上表层、上中层、芯层、下中层和下表层组成,其特征在于:所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物和液体抗静电剂构成,所述液体抗静电剂的质量占芯层总质量的1-3%;所述阻隔层是由改性丙烯腈树脂(AMA)和抗粘连母料构成,所述抗粘连母料的质量占阻隔层总质量的1-6%;所述粘合层由乙烯-醋酸乙烯共聚物(EVA)构成。
进一步方案,所述乙烯-醋酸乙烯共聚物是由乙烯(PE)20-40%、乙酸乙烯酯(VA)为余量构成。
所述改性丙烯腈树脂(AMA)是由丙烯腈/甲基丙烯酸甲酯共聚物构成。
所述液体抗静电剂为乙氧基胺或甘油单硬脂酸酯。
所述抗粘连母料是由玻璃微珠状二氧化硅和等规聚丙烯载体组成,其中二氧化硅的质量占抗粘连母料总质量的25~45wt%,所述二氧化硅的粒径为2~4μm。
所述上表层、下表层的厚度均为1-4μm。
所述上、下中层的厚度均为1-3μm。
本发明的另一个发明目的是提供上述一种高阻隔型双向拉伸共挤薄膜的制备方法,其制备步骤如下:
a、将芯层原料等规聚丙烯均聚物和液体抗静电剂加到主挤出机中,经加热成熔融状态;将阻隔层原料改性丙烯腈树脂和抗粘连母料分别加入两台辅助挤出机中加热熔融;再将粘合层原料乙烯-醋酸乙烯共聚物(EVA)分别加入另外两台辅助挤出机中加热熔融;
b、将上述熔体分别经300~400目滤网过滤后,按上表层、上中层、芯层、下中层和下表层的顺序在五层结构模头中汇合挤出成膜片,然后利用贴片气刀将该膜片贴附到激冷辊上快速冷却形成铸片,最后经25~35℃水浴进一步冷却定型,通过橡胶辊筒及压缩空气对冷却后的铸片进行除水;
c、除水后的铸片进入纵向拉伸工序,首先经过110℃~150℃辊筒预热,然后于110℃~120℃下进行4.0~5.0倍纵向拉伸,并在120~140℃下热定型;
d、热定型后的膜片进入横向拉伸工序,首先在165℃~180℃下进行预热,并于150~160℃下进行8.0~9.0倍横向拉伸,再于150℃~170℃进行热定型;
e、定型后的薄膜经过40~60℃风冷后进入牵引系统展平,经厚度在线检测、电晕处理和收卷得成品。
本发明采用五层共挤方法制备一种高阻隔型双向拉伸共挤薄膜,该方法具有成本低、生产速度快等优点,减少了涂布设备使用成本以及生产过程中无污染废弃物,产品具有非常好的阻隔性、耐候性、耐溶剂性等,且绿色环保,满足食品包装使用要求。
本发明薄膜有五层结构,其上、下表层为具有阻隔性能的树脂,经过挤出双向拉伸制成阻隔膜,减少了涂布机等后续加工设备的投入,具有加工简单、成本低的优点,同时避免了涂布过程中存在溶剂污染和能源消耗等问题。
本发明制备的多层共挤BOPP高阻隔薄膜工艺简单且成本低,制成的高阻隔薄膜具有以下优点:
(1)具有优异的阻隔氧气的能力,能防止脂肪和蛋白质氧化变质;
(2)具有优异的阻隔水蒸气能力,能防止因水汽的进入或引起食物口味的变化;
(3)具有优异的阻隔香气的能力,以防止异味进入或香味的挥发,保证食品原质原味;
(4)具有良好的热封性能,以满足密闭保存的需要;
(5)具有一定的耐热性,以满足杀菌的要求,避免微生物破坏食物;
(6)具有良好的印刷性,以满足装潢美观需要;
(7)具有较强的力学性能,以保护食品,满足搬运和运输的需要。
具体实施方式
下面结合实施例对本发明做进一步描述
以下所述的实施方案,仅是本发明的较佳实施例而已,并非对本发明做任何形式的限制。凡是依据本发明的技术和方法实质对以上实施例所作的任何简单修改、等同变化与修饰,均仍属于本发明的技术和方法方案的范围内。
以下各实施中所有组分的用量为重量份。
各实施例中的乙烯-醋酸乙烯共聚物是由乙烯(PE)20-40%和余量为乙酸乙烯酯(VA)构成;改性丙烯腈树脂(AMA)是由丙烯腈/甲基丙烯酸甲酯共聚物构成。
实施例1
一种高阻隔型双向拉伸共挤薄膜,该薄膜由上表层、上中层、芯层、下中层和下表层组成,所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物99wt%和乙氧基胺1wt%构成;所述阻隔层是由改性丙烯腈树脂(AMA)99wt%和抗粘连母料1wt构成,所述粘合层由乙烯-醋酸乙烯共聚物(EVA)构成。
进一步方案,所述抗粘连母料是由玻璃微珠状二氧化硅和等规聚丙烯载体组成,其中二氧化硅的质量占抗粘连母料总质量的25wt%,所述二氧化硅的粒径为2μm。
进一步方案,所述阻隔层单层厚度为1-4μm,粘合层单层厚度为1-3μm。
其制备方法如下:
a、将芯层原料等规聚丙烯均聚物和液体抗静电剂加到主挤出机中,经加热成熔融状态;将阻隔层原料改性丙烯腈树脂(AMA)和抗粘连母料分别加入两台辅助挤出机中加热熔融;再将粘合层原料乙烯-醋酸乙烯共聚物(EVA)分别加入另外两台辅助挤出机中加热熔融;
b、将上述熔体分别经300~400目滤网过滤后,按上表层、上中层、芯层、下中层和下表层的顺序在五层结构模头中汇合挤出成膜片,利用贴片气刀将该膜片贴附到激冷辊上快速冷却形成铸片,然后经25~35℃水浴进一步冷却定型,通过橡胶辊筒及压缩空气对冷却后的铸片进行除水;
c、除水后的铸片进入纵向拉伸工序,首先经过110℃~150℃辊筒预热,然后于110℃~120℃下进行4.0~5.0倍纵向拉伸,并在120~140℃下热定型;
d、热定型后的膜片进入横向拉伸工序,首先在165℃~180℃下进行预热,并于150~160℃下进行8.0~9.0倍横向拉伸,再于150℃~170℃进行热定型;
e、定型后的薄膜经过40~60℃风冷后进入牵引系统展平,经厚度在线检测、电晕处理和收卷得成品。
实施例2
一种高阻隔型双向拉伸共挤薄膜,该薄膜由上表层、上中层、芯层、下中层和下表层组成,所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物98.5wt%和甘油单硬脂酸酯1.5wt%构成;所述阻隔层是由改性丙烯腈树脂(AMA)97wt%和抗粘连母料3wt%构成,所述粘合层由乙烯-醋酸乙烯共聚物(EVA)构成。
进一步方案,所述抗粘连母料是由玻璃微珠状二氧化硅和等规聚丙烯载体组成,其中二氧化硅的质量占抗粘连母料总质量的30wt%,所述二氧化硅的粒径为2μm。
进一步方案,所述阻隔层单层厚度为1-4μm,粘合层单层厚度为1-3μm。
制备方法同实施例1。
实施例3
一种高阻隔型双向拉伸共挤薄膜,该薄膜由上表层、上中层、芯层、下中层和下表层组成,所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物98wt%和乙氧基胺2wt%构成;所述阻隔层是由改性丙烯腈树脂(AMA)96wt%和抗粘连母料4wt%构成,所述粘合层由乙烯-醋酸乙烯共聚物(EVA)构成。
进一步方案,所述抗粘连母料是由玻璃微珠状二氧化硅和等规聚丙烯载体组成,其中二氧化硅的质量占抗粘连母料总质量的35wt%,所述二氧化硅的粒径为3μm。
进一步方案,所述阻隔层单层厚度为1-4μm,粘合层单层厚度为1-3μm。
制备方法同实施例1。
实施例4
一种高阻隔型双向拉伸共挤薄膜,该薄膜由上表层、上中层、芯层、下中层和下表层组成,所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物97wt%和甘油单硬脂酸酯3wt%构成;所述阻隔层是由改性丙烯腈树脂(AMA)94wt%和抗粘连母料6wt%构成,所述粘合层由乙烯-醋酸乙烯共聚物(EVA)构成。
进一步方案,所述抗粘连母料是由玻璃微珠状二氧化硅和等规聚丙烯载体组成,其中二氧化硅的质量占抗粘连母料总质量的45wt%,所述二氧化硅的粒径为4μm。
进一步方案,所述阻隔层单层厚度为1-4μm,粘合层单层厚度为1-3μm。
制备方法同实施例1。
本发明不限于上述实施例,本领域技术人员根据本发明的揭示,不脱离本发明范畴所做出的改进和修改都应该在本发明的保护范围之内。
Claims (7)
1.一种高阻隔型双向拉伸共挤薄膜,该薄膜由上表层、上中层、芯层、下中层和下表层组成,其特征在于:所述上、下表层为阻隔层,上、下中层为粘合层;所述芯层是由等规聚丙烯均聚物和液体抗静电剂构成,所述液体抗静电剂的质量占芯层总质量的1-3%;所述阻隔层是由改性丙烯腈树脂和抗粘连母料构成,所述抗粘连母料的质量占阻隔层总质量的1-6%;所述改性丙烯腈树脂是由丙烯腈/甲基丙烯酸甲酯共聚物构成;所述粘合层由乙烯-醋酸乙烯共聚物构成。
2.根据权利要求1所述的一种高阻隔型双向拉伸共挤薄膜,其特征在于:所述乙烯-醋酸乙烯共聚物是由乙烯20-40%、乙酸乙烯酯为余量构成。
3.根据权利要求1所述的一种高阻隔型双向拉伸共挤薄膜,其特征在于:所述液体抗静电剂为乙氧基胺或甘油单硬脂酸酯。
4.根据权利要求1所述的一种高阻隔型双向拉伸共挤薄膜,其特征在于:所述抗粘连母料是由玻璃微珠状二氧化硅和等规聚丙烯载体组成,其中二氧化硅的质量占抗粘连母料总质量的25~45wt%,所述二氧化硅的粒径为2~4μm。
5.根据权利要求1所述的一种高阻隔型双向拉伸共挤薄膜,其特征在于:所述上表层、下表层的厚度均为1-4μm。
6.根据权利要求1所述的一种高阻隔型双向拉伸共挤薄膜,其特征在于:所述上、下中层的厚度均为1-3μm。
7.如权利要求1所述的一种高阻隔型双向拉伸共挤薄膜的制备方法,其特征在于:制备步骤如下:
a、将芯层原料等规聚丙烯均聚物和液体抗静电剂加到主挤出机中,经加热成熔融状态;将阻隔层原料改性丙烯腈树脂和抗粘连母料分别加入两台辅助挤出机中加热熔融;再将粘合层原料乙烯-醋酸乙烯共聚物分别加入另外两台辅助挤出机中加热熔融;
b、将上述经加热成熔融状态的原料分别经300~400目滤网过滤后,按上表层、上中层、芯层、下中层和下表层的顺序在五层结构模头中汇合挤出成膜片,然后利用贴片气刀将该膜片贴附到激冷辊上快速冷却形成铸片,最后经25~35℃水浴进一步冷却定型,通过橡胶辊筒及压缩空气对冷却后的铸片进行除水;
c、除水后的铸片进入纵向拉伸工序,首先经过110℃~150℃辊筒预热,然后于110℃~120℃下进行4.0~5.0倍纵向拉伸,并在120~140℃下热定型;
d、热定型后的膜片进入横向拉伸工序,首先在165℃~180℃下进行预热,并于150~160℃下进行8.0~9.0倍横向拉伸,再于150℃~170℃进行热定型;
e、定型后的薄膜经过40~60℃风冷后进入牵引系统展平,经厚度在线检测、电晕处理和收卷得成品。
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