CN106009185A - 一种pe热收缩膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种PE热收缩膜及其制备方法,涉及包装材料领域,它由以下重量份的原料制备而成:乙烯‑醋酸乙烯共聚物40‑60份、聚‑3羟基丁酸酯50‑60份、高密度聚乙烯60‑70份、线性低密度聚乙烯40‑50份、抗氧剂1‑2份、热稳定剂1‑3份、阻燃剂1‑5份、润滑剂1‑3份、开口剂1‑3份,增塑剂2‑4份,通过这些原材料之间的相互协作作用,使得制备的PE收缩膜具有多种优良的性能,具有较强的抗撞击,抗撕裂性能,同时透明性和表面光泽性好,易降解,不会对环境造成污染,本发明的制备方法简单、易操作,能够实现大规模生产。
Description
技术领域
本发明涉及包装材料领域,特别涉及一种PE热收缩膜及其制备方法。
背景技术
随着我国经济的持续发展,包装行业对热收缩膜的需求量日益增多,应用范围也不断扩大,由于热收缩膜不仅在力学性能、包装、贮存、运输、防潮和外观等方面具有良好的综合性能,易于回收和原料的循环使用,满足了环保的要求,而且在自动包装线上提高了包装效率,降低了综合包装成本,正逐步取代传统的包装成为散件集合包装首选。
然而现有技术中的热收缩膜,性能单一,存在着强度低,容易破裂,透明性和表面光泽性差,以及不易降解,对环境造成污染等问题。
如中国申请号为200910156660.8的发明专利公开了一种聚乙烯热收缩膜,有以下组分及重量百分比组成:低密度聚乙烯:50%-65%,茂金属聚乙烯:30%-47%,聚乙烯抗静电剂:1%-5%。此发明提供的聚乙烯热收缩膜虽然具有良好的抗撞击,抗撕裂性能,但是透明性和表面光泽性差,且不易降解。
发明内容
本发明所要解决的技术问题是提供一种PE热收缩膜及其制备方法,以解决现有技术中导致的性能单一,存在着强度低,容易破裂,透明性和表面光泽性差,以及不易降解,对环境造成污染等上述多项缺陷。
为实现上述目的,本发明提供以下的技术方案:一种PE热收缩膜,它由以下重量份的原料制备而成:乙烯-醋酸乙烯共聚物40-60份、聚-3羟基丁酸酯50-60份、高密度聚乙烯60-70份、线性低密度聚乙烯40-50份、抗氧剂1-2份、热稳定剂1-3份、阻燃剂1-5份、润滑剂1-3份、开口剂1-3份,增塑剂2-4份。
优选的,所述线性低密度聚乙烯的熔体流动速率为0.2-1.2g/10min,密度为0.850-0.900g/cm3。
优选的,所述抗氧剂为PS-802抗氧剂。
优选的,所述阻燃剂为溴化环氧树脂。
优选的,所述润滑剂为含氟聚合物加工助剂与聚乙烯的混合体。
优选的,所述开口剂为二氧化硅与聚乙烯的混合体。
优选的,所述增塑剂为己二酸脂。
一种PE热收缩膜的制备方法,包括以下步骤:
(1)按照上述重量份数称取原料;
(2)在75-85℃往反应釜中加入乙烯-醋酸乙烯共聚物、聚-3羟基丁酸酯、高密度聚乙烯、线性低密度聚乙烯、抗氧剂、热稳定剂、阻燃剂、润滑剂、开口剂,增塑剂,并以150-180rpm转速搅拌20-30min;
(3)将反应釜内温度升高至280-300℃,压力降至60pa以下,在此条件下反应1-3h得到聚合熔体,然后将制备的聚合熔体挤出、切粒、干燥,得到PE聚酯切片;
(4)将上述PE聚酯切片熔融挤出、模头铸片、铸片缠卷、双向拉伸、冷却定型、测量厚度、收卷、分切复卷,包装、成品。
优选的,所述熔融挤出温度为280-320℃,所述双向拉伸温度为120-160℃,所述测量厚度为30-40μm。
采用以上技术方案的有益效果是:本发明提供的PE热收缩膜,在线性低密度聚乙烯中加入高密度聚乙烯和低熔融指数的低密度聚乙烯进行改性,获得高强度的聚乙烯材料,力学性能得到了大幅提高,乙烯-醋酸乙烯共聚物的加入,使得产品的透明性和表面光泽性好,且抗老化和耐臭氧强度好,聚-3羟基丁酸酯的加入,不仅具有高的机械强度、热成型性能、而且还能够被生物完全降解,节能环保,开口剂的加入,为了防止薄膜制品粘连在一起,成型好,阻燃剂的加入使得PE收缩膜具有阻燃功能,本发明中还加入了抗氧剂、热稳定剂、润滑剂、开口剂,通过这些原材料之间的相互协作作用,使得制备的PE收缩膜具有多种优良的性能,具有较强的抗撞击,抗撕裂性能,同时透明性和表面光泽性好,易降解,不会对环境造成污染,本发明的制备方法简单、易操作,能够实现大规模生产。
具体实施方式
下面通过对实施例的描述,对本发明的具体实施方式作进一步详细的说明,以帮助本领域的技术人员对本发明的发明构思、技术方案有更完整、准确和深入的理解。
实施例1:
一种PE热收缩膜,它由以下重量份的原料制备而成:乙烯-醋酸乙烯共聚物40份、聚-3羟基丁酸酯60份、高密度聚乙烯60份、线性低密度聚乙烯40份、PS-802抗氧剂2份、热稳定剂1份、溴化环氧树脂1份、含氟聚合物加工助剂与聚乙烯的混合体3份、二氧化硅与聚乙烯的混合体3份,增塑剂为己二酸脂2份,其中线性低密度聚乙烯的熔体流动速率为0.2g/10min,密度为0.850g/cm3。
一种PE热收缩膜的制备方法,包括以下步骤:
(1)按照上述重量份数称取原料;
(2)在75℃往反应釜中加入乙烯-醋酸乙烯共聚物、聚-3羟基丁酸酯、高密度聚乙烯、线性低密度聚乙烯、抗氧剂、热稳定剂、阻燃剂、润滑剂、开口剂,增塑剂,并以150rpm转速搅拌30min;
(3)将反应釜内温度升高至280℃,压力降至60pa以下,在此条件下反应3h得到聚合熔体,然后将制备的聚合熔体挤出、切粒、干燥,得到PE聚酯切片;
(4)将上述PE聚酯切片熔融挤出、模头铸片、铸片缠卷、双向拉伸、冷却定型、测量厚度、收卷、分切复卷,包装、成品,熔融挤出温度为280℃,双向拉伸温度为120℃,测量厚度为30-40μm。
实施例2:
一种PE热收缩膜,它由以下重量份的原料制备而成:乙烯-醋酸乙烯共聚物60份、聚-3羟基丁酸酯50份、高密度聚乙烯70份、线性低密度聚乙烯50份、PS-802抗氧剂1份、热稳定剂3份、溴化环氧树脂5份、含氟聚合物加工助剂与聚乙烯的混合体1份、二氧化硅与聚乙烯的混合体1份,增塑剂为己二酸脂4份,其中线性低密度聚乙烯的熔体流动速率为1.2g/10min,密度为0.900g/cm3。
一种PE热收缩膜的制备方法,包括以下步骤:
(1)按照上述重量份数称取原料;
(2)在85℃往反应釜中加入乙烯-醋酸乙烯共聚物、聚-3羟基丁酸酯、高密度聚乙烯、线性低密度聚乙烯、抗氧剂、热稳定剂、阻燃剂、润滑剂、开口剂,增塑剂,并以180rpm转速搅拌20min;
(3)将反应釜内温度升高至300℃,压力降至60pa以下,在此条件下反应1h得到聚合熔体,然后将制备的聚合熔体挤出、切粒、干燥,得到PE聚酯切片;
(4)将上述PE聚酯切片熔融挤出、模头铸片、铸片缠卷、双向拉伸、冷却定型、测量厚度、收卷、分切复卷,包装、成品,熔融挤出温度为320℃,双向拉伸温度为160℃,测量厚度为30-40μm。
实施例3:
一种PE热收缩膜,它由以下重量份的原料制备而成:乙烯-醋酸乙烯共聚物50份、聚-3羟基丁酸酯55份、高密度聚乙烯65份、线性低密度聚乙烯45份、PS-802抗氧剂1.5份、热稳定剂2份、溴化环氧树脂3份、含氟聚合物加工助剂与聚乙烯的混合体2份、二氧化硅与聚乙烯的混合体2份,己二酸脂3份,线性低密度聚乙烯的熔体流动速率为0.7g/10min,密度为0.875g/cm3。
一种PE热收缩膜的制备方法,包括以下步骤:
(1)按照上述重量份数称取原料;
(2)在80℃往反应釜中加入乙烯-醋酸乙烯共聚物、聚-3羟基丁酸酯、高密度聚乙烯、线性低密度聚乙烯、抗氧剂、热稳定剂、阻燃剂、润滑剂、开口剂,增塑剂,并以165rpm转速搅拌25min;
(3)将反应釜内温度升高至290℃,压力降至60pa以下,在此条件下反应2h得到聚合熔体,然后将制备的聚合熔体挤出、切粒、干燥,得到PE聚酯切片;
(4)将上述PE聚酯切片熔融挤出、模头铸片、铸片缠卷、双向拉伸、冷却定型、测量厚度、收卷、分切复卷,包装、成品,熔融挤出温度为300℃,所述双向拉伸温度为140℃,所述测量厚度为30-40μm。
基于上述,本发明提供的PE热收缩膜,在线性低密度聚乙烯中加入高密度聚乙烯和低熔融指数的低密度聚乙烯进行改性,获得高强度的聚乙烯材料,力学性能得到了大幅提高,乙烯-醋酸乙烯共聚物的加入,使得产品的透明性和表面光泽性好,且抗老化和耐臭氧强度好,聚-3羟基丁酸酯的加入,不仅具有高的机械强度、热成型性能、而且还能够被生物完全降解,节能环保,开口剂的加入,为了防止薄膜制品粘连在一起,成型好,阻燃剂的加入使得PE收缩膜具有阻燃功能,本发明中还加入了抗氧剂、热稳定剂、润滑剂、开口剂,通过这些原材料之间的相互协作作用,使得制备的PE收缩膜具有多种优良的性能,具有较强的抗撞击,抗撕裂性能,同时透明性和表面光泽性好,易降解,不会对环境造成污染,本发明的制备方法简单、易操作,能够实现大规模生产。
以上所述的仅是本发明的优选实施方式,应当指出,对于本领域的普通技术人员来说,在不脱离本发明创造构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。
Claims (9)
1.一种PE热收缩膜,其特征在于:它由以下重量份的原料制备而成:
乙烯-醋酸乙烯共聚物40-60份、聚-3羟基丁酸酯50-60份、高密度聚乙烯60-70份、线性低密度聚乙烯40-50份、抗氧剂1-2份、热稳定剂1-3份、阻燃剂1-5份、润滑剂1-3份、开口剂1-3份,增塑剂2-4份。
2.根据权利要求1所述的PE热收缩膜,其特征在于:所述线性低密度聚乙烯的熔体流动速率为0.2-1.2g/10min,密度为0.850-0.900g/cm3。
3.根据权利要求1所述的PE热收缩膜,其特征在于:所述抗氧剂为PS-802抗氧剂。
4.根据权利要求1所述的PE热收缩膜,其特征在于:所述阻燃剂为溴化环氧树脂。
5.根据权利要求1所述的PE热收缩膜,其特征在于:所述润滑剂为含氟聚合物加工助剂与聚乙烯的混合体。
6.根据权利要求1所述的PE热收缩膜,其特征在于:所述开口剂为二氧化硅与聚乙烯的混合体。
7.根据权利要求1所述的PE热收缩膜,其特征在于:所述增塑剂为己二酸脂。
8.一种如权利要求1-7任意一项所述的PE热收缩膜的制备方法,其特征在于:包括以下步骤:
(1)按照上述重量份数称取原料;
(2)在75-85℃往反应釜中加入乙烯-醋酸乙烯共聚物、聚-3羟基丁酸酯、高密度聚乙烯、线性低密度聚乙烯、抗氧剂、热稳定剂、阻燃剂、润滑剂、开口剂,增塑剂,并以150-180rpm转速搅拌20-30min;
(3)将反应釜内温度升高至280-300℃,压力降至60pa以下,在此条件下反应1-3h得到聚合熔体,然后将制备的聚合熔体挤出、切粒、干燥,得到PE聚酯切片;
(4)将上述PE聚酯切片熔融挤出、模头铸片、铸片缠卷、双向拉伸、冷却定型、测量厚度、收卷、分切复卷,包装、成品。
9.根据权利要求8所述的PE热收缩膜的制备方法,其特征在于:所述熔融挤出温度为280-320℃,所述双向拉伸温度为120-160℃,所述测量厚度为30-40μm。
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CN114407464B (zh) * | 2022-01-13 | 2024-02-23 | 珠海市德燊环保包装有限公司 | 一种高强度、耐撕破的pe膜及其制备方法与应用 |
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