CN111516342A - 一种pe抗紫外线热缩膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种PE抗紫外线热缩膜及其制备方法,涉及热缩膜技术领域。其技术要点是:一种PE抗紫外线热缩膜,包括外层、中层和内层,所述外层包括如下重量份数的组分:C6茂金属聚乙烯:23‑27份;C8茂金属聚乙烯:23‑27份;LDPE:48‑52份;所述中层包括如下重量份数的组分:LDPE:60‑63份;HDPE:33‑38份;抗UV母粒:2‑5份;所述内层包括如下重量份数的组分:C6茂金属聚乙烯:23‑28份;C8茂金属聚乙烯:23‑28份;LDPE:46‑50份;抗UV母粒:1‑3份。通过上述各组分原料制备出来的PE热缩膜具备抗紫外线功能,保证透明度,以及具有包装美观、低成本的优点。
Description
技术领域
本发明涉及热缩膜技术领域,更具体地说,它涉及一种PE抗紫外线热缩膜及其制备方法。
背景技术
热缩膜用于各种产品的销售和运输,其主要作用是稳固、遮盖和保护产品。收缩膜必须具有较高的耐穿刺性,良好的收缩性和一定的收缩应力。在收缩过程中,薄膜不能产生孔洞。在热缩膜中,用途最广泛的为PE热缩膜,PE薄膜是一种韧性很好的材料,不容易用普通的塑料粉碎机粉碎,广泛适用于酒类、易拉罐类、矿泉水类、各种饮料类、布匹等产品的整件集合包装,该产品柔韧性好,抗撞击、抗撕裂性强,不易破损、不怕潮、收缩率大。由于收缩膜经常适用于室外,因此对热收缩膜的抗紫外线性能的要求比较高,然而目前市场上的PE热收缩膜的抗紫外线性能欠佳,现有产品采用里层复合一层黑膜的方案来解决抗紫外线的问题,但是这种膜完全不透明,影响美观,制造成本高。
因此,需要提出一种新的方案来解决上述问题。
发明内容
针对现有技术存在的不足,本发明的目的一在于提供一种PE抗紫外线热缩膜,其具备抗紫外线功能,保证透明度,以及具有包装美观、低成本的优点。
本发明的目的二在于提供一种PE抗紫外线热缩膜的制备方法,其原料易得、成本低廉且制备工艺简单。
为实现上述目的一,本发明提供了如下技术方案:
一种PE抗紫外线热缩膜,包括外层、中层和内层,所述外层包括如下重量份数的组分:
C6茂金属聚乙烯:23-27份;
C8茂金属聚乙烯:23-27份;
LDPE:48-52份;
所述中层包括如下重量份数的组分:
LDPE:60-63份;
HDPE:33-38份;
抗UV母粒:2-5份;
所述内层包括如下重量份数的组分:
C6茂金属聚乙烯:23-28份;
C8茂金属聚乙烯:23-28份;
LDPE:46-50份;
抗UV母粒:1-3份。
通过采用上述技术方案,现有产品采用在内层复合一层黑膜的方案,起完全不透明,影响美观,制造成本高,本发明采用内层、中层和外层复合的方式,充分发挥各层的功效,使得PE热缩膜保持良好的收缩属性和高透明度,具有吸收紫外光线功能,保持12-15个月,而使得内容物(饮料、日化产品)不被紫外线分解,保持集束包装透明美观,低成本。
本发明通过在内层和中层加入抗UV母粒,达到吸收紫外线的效果,使得紫外光与抗UV母粒发生放热反应,将紫外线转换成热量释放,在波长290-390nm有效;此外内外层高比例C6+C8组合可提高热缩膜的热封宽度和抗污性,抑制迁移。
进一步优选为,所述外层包括如下重量份数的组分:
C6茂金属聚乙烯:25份;
C8茂金属聚乙烯:25份;
LDPE:50份;
所述中层包括如下重量份数的组分:
LDPE:61.5份;
HDPE:35份;
抗UV母粒:3.5份;
所述内层包括如下重量份数的组分:
C6茂金属聚乙烯:25份;
C8茂金属聚乙烯:25份;
LDPE:48份;
抗UV母粒:2份。
通过采用上述技术方案,上述各层内所用组分为最优组分,采用上述各重量份数的组分制作出来的PE热缩膜具有最优的抗UV特性。
进一步优选为,所述抗UV母粒由抗氧剂和紫外线吸收剂按照比例1:(2-3)组成。
通过采用上述技术方案,本发明中的抗UV母粒为抗氧剂和紫外线吸收剂经优化复合加工而成,使用该母粒能够有效降低热缩膜因受热氧化而引起的降解作用和因受紫外线光照而引起的降解作用,从而显著提高PE热缩膜的抗老化性能,延长热缩膜的使用寿命,以及保护包装内容物。
进一步优选为,所述抗氧剂为二苯胺。
通过采用上述技术方案,高温,光照易引起高分子材料中某些弱键的断裂或分子结构的交联,从而导致PE材料老化而无法使用,本发明采用二苯胺为抗氧剂,其加入到抗UV母粒中,可抑制或减缓聚合物分子链的断裂,从而延长PE热缩膜的使用寿命。
进一步优选为,所述紫外线吸收剂为水杨酸酯类、苯并三唑类和氯代苯并三唑类中的一种。
通过采用上述技术方案,水杨酸酯类、苯并三唑类和氯代苯并三唑类均为高效的光稳定剂和紫外线吸收剂,其可与紫外线发生放热反应,将紫外线转换为热量释放,保护PE热缩膜,避免紫外线破坏热缩膜结构。
进一步优选为,所述中层还包括重量份数为10-15份的纳米二氧化钛。
通过采用上述技术方案,纳米二氧化钛是白色疏松粉末,屏蔽紫外线作用强,有良好的分散性和耐候性,其加入到中层膜中可起到一定的抗紫外线效果。
进一步优选为,所述外层远离中层的一面还粘合有紫外光反射膜。
通过采用上述技术方案,通过设置紫外光反射膜,当热缩膜受到光照射时,紫外光反射膜先对光线进行反射,使得大部分光无法通过紫外光反射膜,少量通过的光再由外层、中层和内层进行吸收和处理,从而使得光线弱化,以赋予热缩膜更加优良的耐紫外线特性。
为实现上述目的二,本发明提供了如下技术方案:
一种PE抗紫外线热缩膜的制备方法,包括以下步骤:
S1,称取上述重量份的原料,在70-80℃的反应釜中加入各组分原料并以150-250rpm转速搅拌30-40min;
S2,将反应釜内温度升高至280-300℃,压力降到90Pa以下,在此条件下反应2.5-3h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切片;
S3,将上述PE聚切片熔融挤出、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。
通过采用上述技术方案,上述各原料易得、成本低廉且制备工艺简单,得到的PE热缩膜具备抗紫外线功能,保证透明度,以及具有包装美观、低成本的优点。
综上所述,与现有技术相比,本发明具有以下有益效果:
(1)本发明通过在内层和中层加入抗UV母粒,达到吸收紫外线的效果,使得紫外光与抗UV母粒发生放热反应,将紫外线转换成热量释放,在波长290-390nm有效;此外内外层高比例C6+C8组合可提高热缩膜的热封宽度和抗污性,抑制迁移;
(2)本发明采用二苯胺为抗氧剂,其加入到抗UV母粒中,可抑制或减缓聚合物分子链的断裂,从而延长PE热缩膜的使用寿命;
(3)本发明通过在最外层设置紫外光反射膜,当热缩膜受到光照射时,紫外光反射膜先对光线进行反射,使得大部分光无法通过紫外光反射膜,少量通过的光再由外层、中层和内层进行吸收和处理,从而使得光线弱化,以赋予热缩膜更加优良的耐紫外线特性。
附图说明
图1为本发明实施例1中PE抗紫外线热缩膜的制备工艺流程图。
具体实施方式
下面结合附图和实施例,对本发明进行详细描述。
实施例1:一种PE抗紫外线热缩膜,各组分及其相应的重量份数如表1所示,并通过如下步骤制备获得:
步骤一,按照表1称取各原料,在70℃的反应釜中加入各组分原料并以150rpm转速搅拌30min;
步骤二,将反应釜内温度升高至280℃,压力降到90Pa以下,在此条件下反应2.5h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切片;
步骤三,将上述PE聚切片熔融挤出、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。
本实施例中的抗UV母粒由抗氧剂和紫外线吸收剂按照比例1:2组成,其中抗氧剂为二苯胺,紫外光吸收剂为水杨酸酯。
实施例2-6:一种PE抗紫外线热缩膜,与实施例1的不同之处在于,各组分及其相应的重量份数如表1所示。
表1实施例1-6中各组分及其重量份数
实施例7:一种PE抗紫外线热缩膜,与实施例1的不同之处在于,由如下制备步骤获得:
步骤一,按照实施例6中各原料重量份数称取各原料,在80℃的反应釜中加入各组分原料并以250rpm转速搅拌40min;
步骤二,将反应釜内温度升高至300℃,压力降到90Pa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切片;
步骤三,将上述PE聚切片熔融挤出、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。
实施例8:一种PE抗紫外线热缩膜,与实施例1的不同之处在于,中层还包括重量份数为10份的纳米二氧化钛,纳米二氧化钛均匀分布在中层内。
实施例9:一种PE抗紫外线热缩膜,与实施例8的不同之处在于,外层离中层的一面还粘合有紫外光反射膜,本实施例中的紫外光反射膜采用授权公告号为CN106700111B的中国专利中实施例1中制备的反射膜。
对比例1:与实施例1的不同之处在于,本实施例中的热缩膜未加入抗UV母粒。
对比例2:与实施例1的不同之处在于,本实施例中的热缩膜所用原料采用普通聚乙烯代替C6+C8茂金属聚乙烯。
对比例3:与实施例1的不同之处在于,本实施例采用市售普通PE热缩膜。
试验:
拉伸强度测试:根据GB/T 1040.3-2006,使用电子万能材料试验机测定薄膜的(纵向)拉伸强度和断裂伸长率。试样尺寸为15mm*150mm,设定标距为100mm,拉伸速率为10mm/min,对实施例1-9和对比例1-3中的热缩膜进行测试。
抗紫外线测试:采用C/Z-UV型紫外老化试验箱,测试条件为8支40w的紫外荧光灯,温度范围RT+10-80℃,湿度69-95%;对实施例1-9和对比例1-3中的热缩膜分别处理4d,对比拉伸强度。结果计入下表2中。
表2试验结果
以上所述仅是本发明的优选实施方式,本发明的保护范围并不仅局限于上述实施例,凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理前提下的若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (8)
1.一种PE抗紫外线热缩膜,其特征在于,包括外层、中层和内层,所述外层包括如下重量份数的组分:
C6茂金属聚乙烯:23-27份;
C8茂金属聚乙烯:23-27份;
LDPE:48-52份;
所述中层包括如下重量份数的组分:
LDPE:60-63份;
HDPE:33-38份;
抗UV母粒:2-5份;
所述内层包括如下重量份数的组分:
C6茂金属聚乙烯:23-28份;
C8茂金属聚乙烯:23-28份;
LDPE:46-50份;
抗UV母粒:1-3份。
2.根据权利要求1所述的PE抗紫外线热缩膜,其特征在于,所述外层包括如下重量份数的组分:
C6茂金属聚乙烯:25份;
C8茂金属聚乙烯:25份;
LDPE:50份;
所述中层包括如下重量份数的组分:
LDPE:61.5份;
HDPE:35份;
抗UV母粒:3.5份;
所述内层包括如下重量份数的组分:
C6茂金属聚乙烯:25份;
C8茂金属聚乙烯:25份;
LDPE:48份;
抗UV母粒:2份。
3.根据权利要求2所述的PE抗紫外线热缩膜,其特征在于,所述抗UV母粒由抗氧剂和紫外线吸收剂按照比例1:(2-3)组成。
4.根据权利要求3所述的PE抗紫外线热缩膜,其特征在于,所述抗氧剂为二苯胺。
5.根据权利要求3所述的PE抗紫外线热缩膜,其特征在于,所述紫外线吸收剂为水杨酸酯类、苯并三唑类和氯代苯并三唑类中的一种。
6.根据权利要求1所述的PE抗紫外线热缩膜,其特征在于,所述中层还包括重量份数为10-15份的纳米二氧化钛。
7.根据权利要求2所述的PE抗紫外线热缩膜,其特征在于,所述外层远离中层的一面还粘合有紫外光反射膜。
8.根据权利要求1-7任一项所述的一种PE抗紫外线热缩膜的制备方法,其特征在于,包括以下步骤:
S1,称取上述重量份的原料,在70-80℃的反应釜中加入各组分原料并以150-250rpm转速搅拌30-40min;
S2,将反应釜内温度升高至280-300℃,压力降到90Pa以下,在此条件下反应2.5-3h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切片;
S3,将上述PE聚切片熔融挤出、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。
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