CN111234282A - 一种无铝高亮转移膜及其制备方法 - Google Patents

一种无铝高亮转移膜及其制备方法 Download PDF

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CN111234282A
CN111234282A CN202010036553.8A CN202010036553A CN111234282A CN 111234282 A CN111234282 A CN 111234282A CN 202010036553 A CN202010036553 A CN 202010036553A CN 111234282 A CN111234282 A CN 111234282A
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aluminum
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桂柳春
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Shandong Fuyang Packaging Materials Co ltd
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Abstract

本发明涉及一种无铝高亮转移膜,属于包装材料领域,其制备方法包括如下工艺步骤:首先将自制的涂布液涂覆在基底层表面形成涂覆层,然后再分别经120℃、135℃、165℃、200℃、185℃的烘箱烘干成型制亮;本发明旨在替代传统镀铝工序,制得能够达到铝层效果的无铝高亮转移膜,大大降低了生产成本,又有利于环保。

Description

一种无铝高亮转移膜及其制备方法
技术领域
本发明涉及塑料包装技术领域,具体涉及一种用于包装材料的无铝高亮转移膜的制备方法。
背景技术
PET膜具有优异的物理性能、化学性能及稳定性、透明性、可回收性,可广泛的应用于磁记录、感光材料、电子、电气绝缘、工业用膜、包装装饰等领域。其中镀铝离型膜是以PET膜为基材,在PET膜上设置镀铝膜层,以达到外观整洁、无褶皱,兼具防水效果的膜层,且其进一步通过在镀铝膜层上设置离型物质,从而实现降低PET薄膜表面的附着力,以达到离型的效果。
现有技术的镀铝离型膜结构如附图2所示,包括三层结构铝层-涂覆层-基底层,底层基底层为PET聚脂膜,是以优质的纤维级聚酯切片(粘度为0.64)为主要原料,采用先进的工艺配方,经过枯燥、熔融、挤出、铸片和拉伸制成的高档薄膜。该种转移膜产品的工艺流程为:涂布→镀铝→成品膜分切。涂布工艺为:用PET聚脂薄膜经过涂布机的凹印版,凹版辊网穴内粘有15%左右固含量的溶剂型涂料瞬间反粘在PET聚脂薄膜表面,经过涂布机烘箱135度左右的温度烘干,85%的溶剂(包括:丁酮、丁脂、乙脂、甲醚、乙醚类)由液态变为雾态排放到空中,造成空气污染;涂层为溶剂型转移树脂层,是采用丙烯酸树脂、乙酸乙烯脂-丁二烯-苯乙烯聚合物、苯烯酸-丙烯酸共和物与丁脂、乙脂、甲醚类溶剂组成的涂料,经过膜生产设备的涂布机的涂布凹版网版辊网穴转移到PET聚脂膜表面,烘干后形成固态的树脂层;镀铝工艺:用涂布出的半成品经镀铝机的高真空抽排,99.99%高纯度铝丝在1600度左右的高温下溶化成雾态,飞粘在涂布出的半成品膜表面涂层上形成了铝分子层;最后将镀铝后的半成品膜进行分切修边,切成复合工序所有的成品膜规格。
上述工艺中的镀铝工艺,由于金属铝不容易降解,不仅不利于环保,而且镀铝工序中的真空镀铝机购置价格通常在1000万元人民币,生产成本较高。
发明内容
本发明所要解决的技术问题是针对现有技术的不足,提供一种无需镀铝工序即可形成具有铝层效果的无铝高亮转移膜的制备方法,大大降低了生产成本,又有利于环保。
本发明解决上述技术问题的技术方案如下:一种无铝高亮转移膜的制备方法,其特征在于,包括如下工艺步骤:
S1、涂布:涂布液涂覆在基底层表面形成涂覆层;
所述涂布液的制备过程为:用A料与B料混合,在催化剂条件下加入二硬脂酰磷脂酰胆碱经过一定的温度进行反应得到聚氨酯预聚体,然后在聚氨酯预聚体内加入枸杞多糖、三氟三氯乙烷、五氟苄醇、三乙胺进行中和反应再加水就形成涂布液;涂布液涂覆在聚酯基底表面即形成水性转移聚氨脂树脂层;
所述A料采用聚四氢呋喃醚二醇或聚碳酸酯二醇,B料采用异佛尔酮二异氰酸酯或六亚甲基二异氰酸酯,催化剂采用二月桂酸二丁基锡或有机铋;
S2、烘干成型制亮:依次经过第一道烘箱烘温120度、第二道烘箱烘温135度、第三道烘箱烘温165度、第四道烘烘箱烘温200度、第五道烘烘箱烘温185度。
最后进行分切修边,切成所需成品膜规格。
进一步的,所述涂布工艺是采用基底层经过涂布机的凹印版,凹版辊网穴内粘有的涂布液瞬间反粘在基底层表面,经过涂布机烘箱烘干。
进一步的,所述基底层采用PET聚酯膜。
进一步的,所述聚氨酯预聚体的制备过程中反应温度为160-170℃。
进一步的,所述涂布液中各原料分别占如下重量份数:
A料 270
B料 151
催化剂 0.5
二硬脂酰磷脂酰胆碱 135
枸杞多糖 3
三氟三氯乙烷 5
五氟苄醇 2
三乙胺 18
进一步的,所述涂布液的固含量为15%。
另外,所述三乙胺还可以替换成N,N二甲基乙醇胺。
及一种无铝高亮转移膜,其特征在于,采用如上所述的制备方法制得。
本发明的有益效果是:本发明通过自制的涂布液涂布在基底层形成涂覆层后,再经五级特定温度的烘箱处理,使水性聚氨脂树脂层形成有透光、高亮的涂层效果,可直接达到常规镀铝铝层的反射效果,从而取代高真空镀铝的工序工艺。无铝高亮转移膜表面特殊制成后的表面涂层替代了常规转移膜的膜涂层、铝分子所反射出的高光亮色相等,反射率高,用于包装材料表面能够准确显示出印刷后条码的信息输出。本发明减少了制模工序,大大降低了生产成本,且无镀铝工序更加环保,是整个行业节支成本、环保技术的进一步提升,本发明的无铝高亮转移膜产品能够满足现在PET市场的耐高、低温性能,无毒无味,高光亮高环保树聚氨脂树脂水层达到直接承印的效果,能适用于胶版印刷、凹版印刷、柔版印刷、丝网uv印刷等,安全性能好,减少膜制程工序、环保性能超强,也能保持原有的美观、华丽、新颖的外观包装,可直接用于食品包装、烟标包装、酒包包装等,对人们的生活带来了极大的方便。该项目研发环保性能超强、省用高价格的设备。
附图说明
图1是本发明无铝高亮转移膜的结构示意图;
图2是现有技术的镀铝离型膜结构示意图。
图中:1.基底层,2.涂覆层,3.铝层。
具体实施方式
实施例1
本实施例的无铝高亮转移膜,其制备方法包括如下步骤:
S1、涂布:涂布液涂覆在基底层表面形成涂覆层;具体地,基底层采用PET聚酯膜,采用PET聚酯膜经过涂布机的凹印版,凹版辊网穴内粘有固含量为15%的涂布液瞬间反粘在聚酯膜表面,经过涂布机烘箱烘干;
所述涂布液的制备过程为:用270重量份聚四氢呋喃醚二醇与151份异佛尔酮二异氰酸酯混合,在0.5份催化剂二月桂酸二丁基锡条件下加入135份二硬脂酰磷脂酰胆碱在160℃下反应得到聚氨酯预聚体,然后在聚氨酯预聚体内加入3份枸杞多糖、5份三氟三氯乙烷、2份五氟苄醇、18份三乙胺进行中和反应再加水制得固含量为15%的涂布液;
S2、烘干成型制亮:依次经过第一道烘箱烘温120度、第二道烘箱烘温135度、第三道烘箱烘温165度、第四道烘烘箱烘温200度、第五道烘烘箱烘温185度。
实施例2
本实施例的无铝高亮转移膜,其制备方法包括如下步骤:
S1、涂布:涂布液涂覆在基底层表面形成涂覆层;具体地,基底层采用PET聚酯膜,采用PET聚酯膜经过涂布机的凹印版,凹版辊网穴内粘有固含量为15%的涂布液瞬间反粘在聚酯膜表面,经过涂布机烘箱烘干;
所述涂布液的制备过程为:用270重量份聚四氢呋喃醚二醇与151份异佛尔酮二异氰酸酯混合,在0.5份催化剂二月桂酸二丁基锡条件下加入135份二硬脂酰磷脂酰胆碱在165℃下反应得到聚氨酯预聚体,然后在聚氨酯预聚体内加入3份枸杞多糖、5份三氟三氯乙烷、2份五氟苄醇、18份三乙胺进行中和反应再加水制得固含量为15%的涂布液;
S2、烘干成型制亮:依次经过第一道烘箱烘温120度、第二道烘箱烘温135度、第三道烘箱烘温165度、第四道烘烘箱烘温200度、第五道烘烘箱烘温185度。
实施例3
本实施例的无铝高亮转移膜,其制备方法包括如下步骤:
S1、涂布:涂布液涂覆在基底层表面形成涂覆层;具体地,基底层采用PET聚酯膜,采用PET聚酯膜经过涂布机的凹印版,凹版辊网穴内粘有固含量为15%的涂布液瞬间反粘在聚酯膜表面,经过涂布机烘箱烘干;
所述涂布液的制备过程为:用270重量份聚碳酸酯二醇与151份六亚甲基二异氰酸酯混合,在0.5份催化剂有机铋条件下加入135份二硬脂酰磷脂酰胆碱在170℃下反应得到聚氨酯预聚体,然后在聚氨酯预聚体内加入3份枸杞多糖、5份三氟三氯乙烷、2份五氟苄醇、18份N,N二甲基乙醇胺进行中和反应再加水制得固含量为15%的涂布液;
S2、烘干成型制亮:依次经过第一道烘箱烘温120度、第二道烘箱烘温135度、第三道烘箱烘温165度、第四道烘烘箱烘温200度、第五道烘烘箱烘温185度。
对比例1
步骤S1同实施例1,所不同的是,步骤S2采用在步骤S1中得到的涂覆层表面进行镀铝工艺,以替代烘干成型制亮工艺。
对比例2
步骤S1同实施例1,所不同的是,去除步骤S2烘干成型制亮工艺。
对比例3
步骤S1同实施例1,所不同的是,步骤S1中所用的涂布液采用现有技术中的水性苯丙烯酸乳液90%混合水性聚氨酯乳液10%制成。
分别对上述实施例和对比例所得膜进行印刷二维码处理,结果显示,各实施例和对比例1印制效果均较清晰,经扫描二维码信息输出准确,而对比例2和对比例3的印制效果明显差,经扫描二维码信息无法输出。
分别对上述实施例的无铝转移膜和对比例1的镀铝膜进行膜亮度测试(色差值检测),检测结果见表1。
表1 检测结果
实施例1 实施例2 实施例3 对比例1
L(亮度) 31.67 31.89 31.47 30.32
a(红、绿色) -0.11 -0.09 -0.10 0.05
b(黄、蓝色) 1.20 -1.31 -1.19 -0.26
由上述检测及表1数据可知,本发明的无铝高亮转移膜能够直接承印,且对所印刷二维码所含信息输出准确,同时亮度较好,即能够获得镀铝工艺所得转移膜作为包装材料的效果。
尽管上面已经示出和描述了本发明的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本发明的限制,本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (8)

1.一种无铝高亮转移膜的制备方法,其特征在于,包括如下工艺步骤:
S1、涂布:涂布液涂覆在基底层表面形成涂覆层;
所述涂布液的制备过程为:用A料与B料混合,在催化剂条件下加入二硬脂酰磷脂酰胆碱经过一定的温度进行反应得到聚氨酯预聚体,然后在聚氨酯预聚体内加入枸杞多糖、三氟三氯乙烷、五氟苄醇、三乙胺进行中和反应再加水就形成涂布液;涂布液涂覆在聚酯基底表面即形成水性转移聚氨脂树脂层;
所述A料采用聚四氢呋喃醚二醇或聚碳酸酯二醇,B料采用异佛尔酮二异氰酸酯或六亚甲基二异氰酸酯,催化剂采用二月桂酸二丁基锡或有机铋;
S2、烘干成型制亮:依次经过第一道烘箱烘温120度、第二道烘箱烘温135度、第三道烘箱烘温165度、第四道烘烘箱烘温200度、第五道烘烘箱烘温185度。
2.根据权利要求1所述的无铝高亮转移膜的制备方法,其特征在于,所述涂布工艺是采用基底层经过涂布机的凹印版,凹版辊网穴内粘有的涂布液瞬间反粘在基底层表面,经过涂布机烘箱烘干。
3.根据权利要求1或2所述的无铝高亮转移膜的制备方法,其特征在于,所述基底层采用PET聚酯膜。
4.根据权利要求1所述的无铝高亮转移膜的制备方法,其特征在于,所述聚氨酯预聚体的制备过程中反应温度为160-170℃。
5.根据权利要求1所述的无铝高亮转移膜的制备方法,其特征在于,所述涂布液中各原料分别占如下重量份数:
A料 270
B料 151
催化剂 0.5
二硬脂酰磷脂酰胆碱 135
枸杞多糖 3
三氟三氯乙烷 5
五氟苄醇 2
三乙胺 18。
6.根据权利要求1所述的无铝高亮转移膜的制备方法,其特征在于,所述涂布液的固含量为15%。
7.根据权利要求1所述的无铝高亮转移膜的制备方法,其特征在于,所述三乙胺还可以替换成N,N二甲基乙醇胺。
8.一种无铝高亮转移膜,其特征在于,采用如权利要求1或7所述的制备方法制得。
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