CN107719943A - 一种用于包装材料的防刮伤透明薄膜及其制备方法 - Google Patents
一种用于包装材料的防刮伤透明薄膜及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种用于包装材料的防刮伤透明薄膜,包括位于所述的薄膜上层的PMMA层和设于所述的PMMA层下表面的PETG或APET层,所述的PMMA层的厚度占总厚度的5~40%,所述的PETG或APET层的厚度占总厚度的20~95%;进一步,还可在所述的PETG或APET层的下表面设PMMA层。本发明以PMMA层为包装材料的外表层,提供了良好的耐刮花性能,避免因轻微摩擦而被刮花;更优的耐候性能,即使长期暴露于日照风雨中外观变化也很小;更好的耐候性,在储存、运输、使用过程中也不软化变形、发粘,此外,PMMA层本身的易脆性及成本的缺陷通过PET层得到克服。
Description
技术领域
本发明属于外包装材料技术领域,特别涉及一种用于包装材料的防刮伤透明薄膜及其制备方法。
背景技术
塑料透明薄膜在包装领域有广泛的用途,主要有PET、PC、PMMA、PVC、PP、PE和PS等材质,其中,PVC不符合环保趋势,在许多国家、企业被禁用;PP、PE的透明度较差;PS较容易脆裂,加工性一般,且不能进行溶剂胶接;PMMA透光率和硬度都比其它几种材料高,透光率可达93%,洛氏硬度(R标尺)达118,不易刮伤,可进行溶剂胶接、热封、超声波焊接等加工;而且耐候性是所有热塑性塑料里最好的,耐温比PETG高,热变形温度约84℃,但成本较高,与PETG、PC接近,加工中也容易脆裂;PC的透明度也较高,强度也很高,但成本很高,且不能用溶剂胶接,在需要快速接合的加工领域(如手工盒)使用受到限制;PET分为普通无定形PET(俗称APET)和PETG,环保性好,其中,APET薄膜成本远低于PC和PMMA,但因其容易结晶发白,不能用溶剂胶接、热封等工艺加工;PETG因在聚合过程中加入了1,4-环己烷二甲醇形成不结晶的共聚物,所以可溶剂胶接、热封、超声波焊接等加工工艺,但成本与PC相当,且硬度太低,洛氏硬度(R标尺)只有105左右;耐温也比较差,热变形温度只有70℃左右。
市场上外包装材料常用的薄膜为PET膜,其存在表层硬度不高,很容易因轻微摩擦而被刮花,影响美观和透光使用的效果,且热变形温度低,耐候性差的缺陷。尤为重要的,本领域技术人员也还知道,虽然PMMA在硬度、透光率和耐候性方面上均表现的较优越,但除了其本身存在加工易脆裂的缺陷外,其成本高也限制了在包装材料上的使用,因此,研发一种既具有PET膜性质又具有PMMA性质,且成本相对较低的外包装材料薄膜显得极为重要。
此外,现有技术主要将PMMA制成触摸屏的基础材料光学薄膜,利用其具有导电层镀敷性能以涂布加硬剂制成防刮伤光学薄膜,因此,并不会想到利用PMMA自身的硬度来辅助改善其他材料的硬度,特别是因成本因素不会将其应用在包装领域上。透明PETG的牌号选择范围比较窄,洛氏硬度基本在105~108(R标尺),透明PMMA和PC有各种硬度的材料,有的PMMA硬度比PETG低,也有的PC硬度比PMMA高,如伊斯曼化学的PETG GN120的洛氏硬度(R标尺)为107,三菱的PMMAShinkoLite-P UT-300的洛氏硬度(R标尺)为100,盛禧奧的PC300-6洛氏硬度(R标尺)则为118。本发明选用硬度比PETG高的PMMA作耐刮花的表面层,而上述基础材料光学薄膜则对硬度没要求。
发明内容
本发明提供了一种用于包装材料的防刮伤透明薄膜及其制备方法,通过至少在PETG或APET层的上表面设置一层PMMA层,即以PMMA层为包装材料的上表面层或上下表面层,PETG或APET层为包装材料的下表面层或夹心层,既利用了PMMA在硬度、透光率和耐候性方面上及加工上可溶剂胶接等优越特性,又利用了PETG或APET的柔韧性及成本低廉等优点,即利用一方在某一性能上的优势以解决另一方在该性能的劣势,且兼顾成本因素,使得本发明的薄膜具有耐刮花性能、耐候性能、高透明度及在进行刻压、冲切、折叠等加工过程而不破裂,且成本相对较低等优点。
本发明的技术方案如下:
一种用于包装材料的防刮伤透明薄膜,包括位于所述的薄膜上层的PMMA层和设于所述的PMMA层下表面的PETG或APET层,所述的PMMA层的厚度占总厚度的5~40%,所述的PETG或APET层的厚度占总厚度的20~95%。
在本发明的其中一个实施例,在所述的PETG或APET层的下表面还设有PMMA层,其厚度占总厚度的5~40%。
当以PMMA为薄膜包装材料的上表面层或上下表面层时,其厚度占总厚度优选为7~20%,所述的PETG或APET层2的厚度占总厚度的30~90%。
优选为,所述的薄膜的总厚度为0.1~6mm,进一步优选为0.1~3mm,更为优选为0.15~0.95mm。
优选为,所述的薄膜的硬度比PETG或APET层的硬度高,具体所述的薄膜的洛氏硬度R标尺不小于110。
优选为,所述的薄膜的透光率大于86%,进一步优选为所述的薄膜的透光率大于90%。
优选为,所述的PMMA层可不含有PET或含有少量的PET,PET的含量范围为0~50%;,所述的PETG或APET层可不含有PMMA或含有少量PMMA,PMMA的含量范围为0~50%。
本发明还公开了一种上述的用于包装材料的防刮伤透明薄膜的制备方法,包括PMMA从一台挤出机挤出塑化,熔融物料流向分配器,PETG或APET从另一台挤出机挤出塑化,熔融物料也流向分配器,其中,PMMA在分配器分成一层或两层熔融料流,在分配器与PETG或APET层的一侧或两侧叠合在一起,形成两层或三层结构的薄膜。
与现有技术相比,本发明的有益效果如下:
一、本发明的一种用于包装材料的防刮伤透明薄膜,通过在PETG或APET层的上表面设置一PMMA层,以PMMA层为包装材料的外表层,以提供良好的耐刮花性能,避免因轻微摩擦而被刮花,保持了美观和透光的效果,且长期在室外暴露于日照风雨中外观变化很小,具有更优的耐候性能;
二、本发明的一种用于包装材料的防刮伤透明薄膜,还充分利用了PMMA的高透光率,提高了产品整体的透光率,且PMMA的热变形温度为84℃,比PETG热变形温度(约70℃)高14℃,能更好的耐受储存、运输、使用过程中的高温环境而不软化变形、发粘;
三、本发明的一种用于包装材料的防刮伤透明薄膜,PMM的缺点被PET层很好的克服,PET层不易脆裂,可以进行刻压、冲切、折叠等加工而不破裂,而且当使用APET时,APET成本低廉,在多数应用情况下APET层是所述薄膜的主体用料,有效地较低了产品的成本。
当然,实施本发明的任一产品并不一定需要同时达到以上所述的所有优点。
附图说明
图1为本发明的一种用于包装材料的防刮伤透明薄膜的结构示意图;
图2为本发明的一种用于包装材料的防刮伤透明薄膜的另一结构示意图。
具体实施方式
下面结合具体实施例,进一步阐述本发明。应该理解,这些实施例仅用于说明本发明,而不用于限定本发明的保护范围。在实际应用中本领域技术人员根据本发明做出的改进和调整,仍属于本发明的保护范围。
为了更好的说明本发明,下方结合附图对本发明进行详细的描述。
如图1所示,本发明的一种用于包装材料的防刮伤透明薄膜,包括位于所述的薄膜上层的PMMA层1和设于所述的PMMA层1下表面的PETG或APET层2,即PET层,所述的PMMA层1的厚度占总厚度的5~40%,所述的PETG或APET层2的厚度占总厚度的20~95%。
在本发明的另一个具体实施例,如图2所示,在所述的PETG或APET层2的下表面还设有PMMA层3,其厚度占总厚度的5~40%。
其中,当以PMMA为薄膜包装材料的上表面层或上下表面层时,其厚度占总厚度优选为7~20%,所述的PETG或APET层2的厚度占总厚度的30~90%。
此外,在所述的薄膜的各层材料中还可添加不明显影响薄膜透光率的各类添加剂,如抗氧剂、紫外线吸收剂、润滑剂和增加PMMA层与PET层结合力的偶联剂等。
本发明还公开了一种上述的用于包装材料的防刮伤透明薄膜的制备方法,包括PMMA从一台挤出机挤出塑化,熔融物料流向分配器,PETG或APET从另一台挤出机挤出塑化,熔融物料也流向分配器,其中,PMMA在分配器分成一层或两层熔融料流,在分配器与PETG或APET层的一侧或两侧叠合在一起,形成两层或三层结构的薄膜。
即:PMMA在分配器分成两层熔融料流,在分配器与PET层两侧叠合在一起,形成三层结构的薄膜;和,PMMA在分配器处无须分成两层,直接与PET层叠合,形成两层结构的薄膜。叠合后的两层或三层熔融物料继续流向模头,从模头流出后进入三辊快速冷却成型,经修边收卷,即可制得所述薄膜。
此外,还可采用模内复合的共挤工艺生产所述透明薄膜,即两层或三层熔融物料不在分配器叠合,而是进入模头后叠合在一起;且本领域的技术人员还知道,生产所述三层共挤透明薄膜时,PMMA也可以用两台挤出机挤出塑化,形成两股熔融料与另一台挤出机挤出塑化输出的PET熔融料进行叠合。
实施例1
本实施例1的一种用于包装材料的防刮伤透明薄膜,包括位于所述的薄膜上层的PMMA层1、设于所述的PMMA层1下表面的APET层2和在所述的APET层2的下表面还设有的PMMA层3,所述的PMMA层1的厚度占总厚度的10%,所述的APET层2的厚度占总厚度的80%,所述的PMMA层3的厚度占总厚度的10%,所述的薄膜的总厚度为0.3mm。其制备方法为:将PMMA粒料、APET粒料分别进行干燥处理,输送至共挤片材机组挤出成型;性能测试结果,如表一所示,且同等厚度的PETG/APET/PETG薄膜材料的性能,如表二所示。
表一
表二
实施例2
本实施例2的一种用于包装材料的防刮伤透明薄膜,包括位于所述的薄膜上层的PMMA层1和设于所述的PMMA层1下表面的APET层2,所述的PMMA层1的厚度占总厚度的20%,所述的APET层2的厚度占总厚度的80%,所述的薄膜的总厚度为0.25mm。其制备方法为:PMMA粒料和PET粒料进行干燥处理,然后输送至共挤片材机组挤出成型;性能测试,如表三所示,且同等厚度的PETG/APET薄膜材料的性能,如表四所示。
表三
表四
实施例3
本实施例3的一种用于包装材料的防刮伤透明薄膜,包括位于所述的薄膜上层的PMMA层1、设于所述的PMMA层1下表面的APET层2和在所述的APET层2的下表面还设有的PMMA层3,所述的PMMA层1的厚度占总厚度的7%,所述的APET层2的厚度占总厚度的86%,所述的PMMA层3的厚度占总厚度的7%,所述的薄膜的总厚度为0.3mm。其制备方法为:将PMMA粒料、APET粒料分别进行干燥处理,输送至共挤片材机组挤出成型;性能测试,如表五所示,且同等厚度的PETG薄膜材料的性能,如表六所示,同等厚度的PETG/APET/PETG片材在厚度大于1mm时APET容易因冷却速度太慢而结晶发白,严重影响透明度,在此不作对比。
表五
表六
以上公开的本发明优选实施例只是用于帮助阐述本发明。优选实施例并没有详尽叙述所有的细节,也不限制该发明仅为所述的具体实施方式。显然,根据本说明书的内容,可作很多的修改和变化。本说明书选取并具体描述这些实施例,是为了更好地解释本发明的原理和实际应用,从而使所属技术领域技术人员能很好地理解和利用本发明。本发明仅受权利要求书及其全部范围和等效物的限制。
Claims (10)
1.一种用于包装材料的防刮伤透明薄膜,其特征在于,包括位于所述的薄膜上层的PMMA层和设于所述的PMMA层下表面的PETG或APET层,所述的PMMA层的厚度占总厚度的5~40%,所述的PETG或APET层的厚度占总厚度的20~95%。
2.根据权利要求1所述的用于包装材料的防刮伤透明薄膜,其特征在于,在所述的PETG或APET层的下表面还设有PMMA层,其厚度占总厚度的5~40%。
3.根据权利要求1或2所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的薄膜的总厚度为0.1~6mm。
4.根据权利要求3所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的薄膜的总厚度为0.1~3mm。
5.根据权利要求4所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的薄膜的总厚度为0.15~0.95mm。
6.根据权利要求1或2所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的薄膜的洛氏硬度R标尺不小于110。
7.根据权利要求1或2所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的薄膜的透光率大于86%。
8.根据权利要求7所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的薄膜的透光率大于90%。
9.根据权利要求1或2所述的用于包装材料的防刮伤透明薄膜,其特征在于,所述的PMMA层还含有少量的PET,PET的含量范围为0~50%;所述的PETG或APET层还含有少量的PMMA,PMMA的含量范围为0~50%。
10.一种如权利要求1~9所述的用于包装材料的防刮伤透明薄膜的制备方法,其特征在于,包括PMMA从一台挤出机挤出塑化,熔融物料流向分配器,PETG或APET从另一台挤出机挤出塑化,熔融物料也流向分配器,其中,PMMA在分配器分成一层或两层熔融料流,在分配器与PETG或APET层的一侧或两侧叠合在一起,形成两层或三层结构的薄膜。
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