CN108129783A - 一种高性能包装用复合薄膜 - Google Patents

一种高性能包装用复合薄膜 Download PDF

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CN108129783A
CN108129783A CN201711416639.8A CN201711416639A CN108129783A CN 108129783 A CN108129783 A CN 108129783A CN 201711416639 A CN201711416639 A CN 201711416639A CN 108129783 A CN108129783 A CN 108129783A
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姚启明
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Anhui Province Linquan County Wanlong Plastic Packaging Co Ltd
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Abstract

本发明公开了一种高性能包装用复合薄膜,由如下重量份原料制成:聚乙烯醇60‑70份、纳米二氧化钛15‑20份、硅灰15‑20份、甘油6‑9份、纳米Au38(SCH2CH2CH3)24团簇0.5‑1份;所述复合薄膜的制备方法,包括如下步骤:(1)对聚乙烯醇进行改性;(2)将改性聚乙烯醇送入恒温鼓风干燥箱进行干燥;(3)制备改性聚乙烯醇母液;(4)制备共混改性聚乙烯醇复合薄膜母液;(5)流延成膜。本发明的复合薄膜以聚乙烯醇为基料,科学掺杂了纳米二氧化钛和硅灰,使得复合薄膜的抗拉强度、热稳定性和耐水性都得到了提高,有着良好的透光性和较低的雾度;纳米二氧化钛耐老化、耐高温、综合性能优良、抗菌性稳定,能够提高复合薄膜的抗菌性能。

Description

一种高性能包装用复合薄膜
技术领域
本发明属于复合薄膜技术领域,具体地,涉及一种高性能包装用复合薄膜。
背景技术
在食品包装行业,真空包装、充气包装、气调包装、高温蒸煮包装、无菌包装及涂覆、印刷复合基材的应用非常广泛,真空包装是将食品放入包装袋内,抽出包装袋内的空气,达到预定真空度后将其封口,其主要作用是除氧,以防止食品变质。充气包装是在抽真空后再冲入氮气、二氧化碳、氧气单一气体或两三种气体的混合。气调包装是采用气调保鲜气体(2-4种气体根据食品特性配比混合),对包装袋内的空气进行置换,改变包装袋内食品的外部环境,抑制细菌的生长繁衍,减缓新鲜食品新陈代谢的速度,从而延长食品的保鲜期或货架期。无菌包装是指将经过杀菌、已达到商业无菌状态的产品(液态奶及奶制品、饮料等),封闭在已杀菌的容器中,在无菌环境下进行灌注,灌装后包装容器保持密封的一种包装方法。与真空包装、充气包装、气调包装及高温蒸煮包装、无菌包装及涂覆、印刷、复合基材技术同步发展的是复合软包装薄膜,真空包装、充气包装、气调包装及高温蒸煮包装、无菌包装及涂覆、印刷复合基材技术的关键是保持包装薄膜的阻隔功能性和优良的热封性能。
包装材料的广泛使用离不开薄膜的使用,但是单一材料的薄膜往往有其自身的缺陷,因此,将各种材料复合在一起扬长避短符合市场发展趋势。
发明内容
针对上述背景技术中现有技术的不足,本发明提供了一种高性能包装用复合薄膜。
本发明的目的可以通过以下技术方案实现:
一种高性能包装用复合薄膜,由如下重量份原料制成:聚乙烯醇60-70份、纳米二氧化钛15-20份、硅灰15-20份、甘油6-9份、纳米Au38(SCH2CH2CH3)24团簇0.5-1份;
所述复合薄膜由如下步骤制成:
(1)改性聚乙烯醇:将纳米TiO2分散于蒸馏水中,经超声振荡混合均匀,缓慢加入聚乙烯醇颗粒,恒温搅拌均匀,得到聚乙烯醇-TiO2复合溶胶,胶体经胶磨后,真空抽滤脱气、静置,制得纳米TiO2改性聚乙烯醇;
(2)将改性聚乙烯醇送入恒温鼓风干燥箱进行干燥;
(3)将干燥后的改性聚乙烯醇加入去离子水中,恒温搅拌溶胀,再加入甘油,加热升温后恒温搅拌至改性聚乙烯醇完全溶化,制得改性聚乙烯醇母液;
(4)向改性聚乙烯母液中加入硅灰、纳米Au38(SCH2CH2CH3)24团簇,恒温搅拌至硅灰粉末与母液融合均匀,脱气处理,制得共混改性聚乙烯醇复合薄膜母液;
(5)使用流延法成膜,得到的膜置于恒温恒湿箱平衡30-48h,制得高性能包装用复合薄膜。
所述甘油的质量分数1%。
所述步骤(1)中纳米TiO2分散于蒸馏水制成0.015%-0.02%TiO2溶液,TiO2分散温度为95-100℃,分散时间为25-30min。
所述步骤(2)中干燥温度75-80℃,干燥时间10-12h。
所述步骤(3)中溶胀温度25-30℃,溶胀搅拌时间1-2h。
所述步骤(3)中加热升温至90-100℃,搅拌时间2-3h。
所述步骤(4)中恒温搅拌温度90-100℃,搅拌时间2-3h。
所述步骤(4)中脱气处理为-0.1MPa下脱气1-1.5h。
所述步骤(5)中流延成膜于60-70℃下干燥2-3h成膜。
所述步骤(5)中恒温恒湿箱相对湿度53%、温度28℃。
本发明的有益效果:
本发明的复合薄膜以聚乙烯醇为基料,科学掺杂了纳米二氧化钛和硅灰,使得复合薄膜的抗拉强度、热稳定性和耐水性都得到了提高,有着良好的透光性和较低的雾度;纳米二氧化钛具有耐老化、耐高温、综合性能优良、抗菌性稳定、长久等优点,纳米二氧化钛的加入能够提高复合薄膜的抗菌性能;同时,本发明在原料里添加了甘油,甘油能够起到增塑的效果。
具体实施方式
下面将结合实施例对本发明的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
一种高性能包装用复合薄膜,由如下重量份原料制成:聚乙烯醇60-70份、纳米二氧化钛15-20份、硅灰15-20份、甘油6-9份、纳米Au38(SCH2CH2CH3)24团簇0.5-1份;
甘油的质量分数1%;
纳米Au38(SCH2CH2CH3)24团簇是金团簇的纳米尺寸材料,微量加入能够增强薄膜的韧性;
所述复合薄膜的制备方法,包括如下步骤:
(1)对聚乙烯醇进行改性:将纳米TiO2溶于蒸馏水中,经超声振荡混合均匀,制成0.015%-0.02%TiO2溶液,然后缓慢加入聚乙烯醇颗粒,在95-100℃恒温搅拌25-30min,得到聚乙烯醇-TiO2复合溶胶,胶体经胶磨7-9遍后,真空抽滤脱气、静置,制得纳米TiO2改性聚乙烯醇;
(2)将改性聚乙烯醇送入恒温鼓风干燥箱于75-80℃干燥10-12h;
(3)将干燥后的改性聚乙烯醇加入去离子水中,于25-30℃下恒温搅拌溶胀1-2h,再加入甘油,升温至90-100℃下恒温搅拌2-3h至改性聚乙烯醇完全溶化,制得改性聚乙烯醇母液;
(4)向改性聚乙烯母液中加入硅灰、纳米Au38(SCH2CH2CH3)24团簇,并于90-100℃下恒温搅拌3-4h至硅灰粉末与母液融合均匀,在-0.1MPa下脱气1-1.5h,制得共混改性聚乙烯醇复合薄膜母液;
(5)使用流延法于60-70℃下干燥2-3h成膜,得到的膜置于53%相对湿度和28℃的恒温恒湿箱平衡30-48h,制得高性能包装用复合薄膜。
实施例1
一种高性能包装用复合薄膜,其制备方法包括如下步骤:
(1)对聚乙烯醇进行改性:将15份纳米TiO2溶于10000份蒸馏水中,经超声振荡混合均匀,制成0.15%TiO2溶液,然后缓慢加入60份聚乙烯醇颗粒,在95℃恒温搅拌25min,得到聚乙烯醇-TiO2复合溶胶,胶体经胶磨7遍后,真空抽滤脱气、静置,制得纳米TiO2改性聚乙烯醇;
(2)将改性聚乙烯醇送入恒温鼓风干燥箱于75℃干燥10h;
(3)将干燥后的改性聚乙烯醇加入去离子水中,于25℃下恒温搅拌溶胀1h,再加入6份甘油,升温至90℃下恒温搅拌2h至改性聚乙烯醇完全溶化,制得改性聚乙烯醇母液;
(4)向改性聚乙烯母液中加入15份硅灰、0.5份纳米Au38(SCH2CH2CH3)24团簇,并于90℃下恒温搅拌3h至硅灰粉末与母液融合均匀,在-0.1MPa下脱气1h,制得共混改性聚乙烯醇复合薄膜母液;
(5)使用流延法于60℃下干燥2h成膜,得到的膜置于53%相对湿度和28℃的恒温恒湿箱平衡30h,制得高性能包装用复合薄膜。
实施例2
一种高性能包装用复合薄膜,其制备方法包括如下步骤:
(1)对聚乙烯醇进行改性:将18份纳米TiO2溶于10000份蒸馏水中,经超声振荡混合均匀,制成0.18%TiO2溶液,然后缓慢加入65份聚乙烯醇颗粒,在97℃恒温搅拌28min,得到聚乙烯醇-TiO2复合溶胶,胶体经胶磨8遍后,真空抽滤脱气、静置,制得纳米TiO2改性聚乙烯醇;
(2)将改性聚乙烯醇送入恒温鼓风干燥箱于77℃干燥11h;
(3)将干燥后的改性聚乙烯醇加入去离子水中,于28℃下恒温搅拌溶胀1.5h,再加入7份甘油,升温至95℃下恒温搅拌2.5h至改性聚乙烯醇完全溶化,制得改性聚乙烯醇母液;
(4)向改性聚乙烯母液中加入18份硅灰、0.7份纳米Au38(SCH2CH2CH3)24团簇,并于95℃下恒温搅拌3.5h至硅灰粉末与母液融合均匀,在-0.1MPa下脱气1.2h,制得共混改性聚乙烯醇复合薄膜母液;
(5)使用流延法于65℃下干燥2.5h成膜,得到的膜置于53%相对湿度和28℃的恒温恒湿箱平衡40h,制得高性能包装用复合薄膜。
实施例3
一种高性能包装用复合薄膜,其制备方法包括如下步骤:
(1)对聚乙烯醇进行改性:将20份纳米TiO2溶于1000份蒸馏水中,经超声振荡混合均匀,制成0.2%TiO2溶液,然后缓慢加入70份聚乙烯醇颗粒,在100℃恒温搅拌30min,得到聚乙烯醇-TiO2复合溶胶,胶体经胶磨9遍后,真空抽滤脱气、静置,制得纳米TiO2改性聚乙烯醇;
(2)将改性聚乙烯醇送入恒温鼓风干燥箱于80℃干燥12h;
(3)将干燥后的改性聚乙烯醇加入去离子水中,于30℃下恒温搅拌溶胀2h,再加入9份甘油,升温至100℃下恒温搅拌3h至改性聚乙烯醇完全溶化,制得改性聚乙烯醇母液;
(4)向改性聚乙烯母液中加入20份硅灰、1份纳米Au38(SCH2CH2CH3)24团簇,并于100℃下恒温搅拌4h至硅灰粉末与母液融合均匀,在-0.1MPa下脱气1.5h,制得共混改性聚乙烯醇复合薄膜母液;
(5)使用流延法于70℃下干燥3h成膜,得到的膜置于53%相对湿度和28℃的恒温恒湿箱平衡48h,制得高性能包装用复合薄膜。
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)

1.一种高性能包装用复合薄膜,其特征在于,由如下重量份原料制成:聚乙烯醇60-70份、纳米二氧化钛15-20份、硅灰15-20份、甘油6-9份、纳米Au38(SCH2CH2CH3)24团簇0.5-1份;
所述复合薄膜由如下步骤制成:
(1)改性聚乙烯醇:将纳米TiO2分散于蒸馏水中,经超声振荡混合均匀,缓慢加入聚乙烯醇颗粒,恒温搅拌均匀,得到聚乙烯醇-TiO2复合溶胶,胶体经胶磨后,真空抽滤脱气、静置,制得纳米TiO2改性聚乙烯醇;
(2)将改性聚乙烯醇送入恒温鼓风干燥箱进行干燥;
(3)将干燥后的改性聚乙烯醇加入去离子水中,恒温搅拌溶胀,再加入甘油,加热升温后恒温搅拌至改性聚乙烯醇完全溶化,制得改性聚乙烯醇母液;
(4)向改性聚乙烯母液中加入硅灰、纳米Au38(SCH2CH2CH3)24团簇,恒温搅拌至硅灰粉末与母液融合均匀,脱气处理,制得共混改性聚乙烯醇复合薄膜母液;
(5)使用流延法成膜,得到的膜置于恒温恒湿箱平衡30-48h,制得高性能包装用复合薄膜。
2.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述甘油的质量分数1%。
3.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(1)中纳米TiO2分散于蒸馏水制成0.015%-0.02%TiO2溶液,TiO2分散温度为95-100℃,分散时间为25-30min。
4.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(2)中干燥温度75-80℃,干燥时间10-12h。
5.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(3)中溶胀温度25-30℃,溶胀搅拌时间1-2h。
6.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(3)中加热升温至90-100℃,搅拌时间2-3h。
7.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(4)中恒温搅拌温度90-100℃,搅拌时间2-3h。
8.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(4)中脱气处理为-0.1MPa下脱气1-1.5h。
9.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(5)中流延成膜于60-70℃下干燥2-3h成膜。
10.根据权利要求1所述的一种高性能包装用复合薄膜,其特征在于,所述步骤(5)中恒温恒湿箱相对湿度53%、温度28℃。
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