CN113832767A - 一种热敏纸用水性涂布液及其制备方法 - Google Patents
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Abstract
本发明提供了一种热敏纸用水性涂布液,其包括改性环氧树脂、羧基丁苯胶乳、羧甲基纤维素、附着力促进剂、表面活性剂和水。本申请提供的水性涂布液通过加入上述组分并调整上述组分的含量,使得水性涂布液形成的涂层具有防水、防油性能,使合成热敏纸基材在长期保存环境中不会出现涂层脱落导致印刷掉墨、字迹消失的现象。
Description
技术领域
本发明涉及印刷技术领域,尤其涉及一种热敏纸用水性涂布液及其制备方法。
背景技术
热敏纸又称为热敏传真纸、热敏记录纸或热敏复印纸。热敏纸是一种加工纸,其制作原理是在普通纸基上涂敷微粒粉末,成分是无色染料苯酚类或其他酸性物质,以薄膜相隔,在受热条件下薄膜融化,粉末混合起显色反应。常规此变色层所用的化学试剂有十几种,但至少有下列化合物:无色染料,该染料的品种甚广,最常用的是荧光化合物;显色剂约占20%以下,常用的有双酚、对羟基苯甲酸;增感剂约占10%以下,其中含有苯磺酸酰胺类化合物;填料约占50%以下,常用的有微粒碳酸钙;胶黏剂约占10%以下,如聚乙酸乙烯;稳定剂,如对酞酸二苯酰;润滑剂等。热敏纸的工作原理是:将打印信息输入收银机等设备,激发打印头升温,诱导热敏纸变色层发生化学变化,从而显示清晰的文字和图像。
若热敏纸上显色的字迹不稳定、易消褪,导致文件内容难以辨认。目前,传统的纸质热敏纸标签,由于在冷链使用环境中,容易被冷凝水泡烂,造成信息不可识别,因此以合成纸为基材的合成热敏纸需求在增大。但是合成纸基材表面极其平滑,同时润湿张力低,涂层不容易涂布或者涂层与基材的粘着性表现差,在冷链使用环境中,反复的冷热交替会让热敏合成纸的涂层脱落。
另外,有些相关领域还要求感热记录材料具备一定的透明性,比如食品标签领域,生产厂家信息、食品原材料、保质期等信息被要求在标签上表示,因此由于包含的内容过多使得标签大型化,如果是传统的不透明标签,会让消费者因为看不到食物的内容而放弃购买,而透明热敏纸基材为透明高分子薄膜,也会遇到上述合成热敏纸相同的问题。
发明内容
本发明解决的技术问题在于提供一种热敏纸用水性涂布液,本申请提供的水性涂布液作为热敏纸涂层具有防水、防油性能。
有鉴于此,本申请提供了一种热敏纸用水性涂布液,按100重量份计,包括:
优选的,所述改性环氧树脂选自环氧改性丙烯酸树脂。
优选的,所述表面活性剂为质量比为(4~6):1的微晶蜡乳液和阳离子聚丙烯酰胺乳液的混合物。
优选的,所述改性环氧树脂的含量为40~48重量份。
优选的,所述羟基丁苯胶乳的含量为3~6重量份。
优选的,所述羟甲基纤维素的含量为4~8重量份。
优选的,所述附着力促进剂的含量为6~8重量份。
优选的,所述表面活性剂的含量为0.2~0.4重量份。
本申请还提供了所述的热敏纸用水性涂布液的制备方法,包括:
按照各组分配比,将改性环氧树脂、羟基丁苯胶乳、羟甲基纤维素和水混合,再加入附着力促进剂和表面活性剂,得到热敏纸用水性涂布液。
优选的,所述混合采用搅拌的方式进行,所述搅拌的转速为100~500转/min,所述搅拌的时间为30~60min。
本申请提供了一种热敏纸用水性涂布液,其包括改性环氧树脂、羧基丁苯胶乳、羧甲基纤维素、附着力促进剂、表面活性剂和水。本申请提供的水性涂布液中的改性环氧树脂由环氧基与羧基发生酯化反应改性,使聚合物链间发生交联反应,形成交联网状结构,为涂膜提供网状结构,使涂膜具有良好的物理性能,耐水性好;羧基丁苯胶乳可优化防水性;羟甲基纤维素具有良好的成膜性,作为助剂可以减小纸面的气孔,提高纸张的抗水抗油性;附着力促进剂具有稳固整体附着力的作用;表面活性剂的加入使表面张力降低,在热敏纸上涂布形成的涂膜均匀平整。因此,本申请提供的水性涂布液通过加入上述组分并调整上述组分的含量,使得水性涂布液形成的涂层具有防水、防油性能,使合成热敏纸基材在长期保存环境中不会出现涂层脱落导致印刷掉墨、字迹消失的现象。
具体实施方式
为了进一步理解本发明,下面结合实施例对本发明优选实施方案进行描述,但是应当理解,这些描述只是为进一步说明本发明的特征和优点,而不是对本发明权利要求的限制。
鉴于现有技术中热敏纸的保存问题以及防水、防油的性能需求,本申请提供了一种能够延长热敏纸的保存期问题,提高了热敏纸的防水、防油性能的水性涂布液,具体的,本发明实施例公开了一种热敏纸用水性涂布液,按100重量份计,包括:
在本申请提供的水性涂布液中,所述的改性环氧树脂为环氧改性丙烯酸树脂,其是由环氧基与羧基发生酯化反应改性得到,其是聚合物链间发生交联反应,形成交联网状结构,为涂膜提供网状结构,使涂膜具有良好的物理性能和耐水性。所述改性环氧树脂的含量为30~50重量份,更具体的,所述改性环氧树脂的含量为40~50重量份,更具体地,所述改性环氧树脂的含量为40~48重量份。在本申请中,所述的环氧改性丙烯酸树脂具体为江门市恒光新材料有限公司6800型号。
所述的羧基丁苯胶乳具体为济南忠奥化工有限公司的ZA-7101。该胶乳粒子具有良好的疏水性,与水溶性胶粘剂相比,使用胶乳作为胶粘剂的涂层具有更好的防水性能。所述羧基丁苯胶乳的含量为2~8重量份,更具体地,所述羧基丁苯胶乳的含量为3~6重量份;所述羧基丁苯胶乳的含量过多则影响乳液的印刷性能。
所述的羟甲基纤维素是天然纤维素经碱化、醚化,引入水化羧甲基的线形聚合物,具有良好的成膜性,作为助剂进行产品表面施胶后可以减小纸面的气孔,提高纸张的抗水抗油性。在本申请中,所述羟甲基纤维素为长虹羟甲基纤维素。所述羟甲基纤维素的含量为4~10重量份,更具体地,所述羟甲基纤维素的含量为4~8重量份。所述羟甲基纤维素的含量过少则不能均匀成膜,含量过多成膜厚,影响纸张手感的同时性能过剩。
所述附着力促进剂用以提高水性涂布液的附着力,在本申请中,所述附着力促进剂具体为海明斯德谦Adherant 1121。所述附着力促进剂的含量为5~10重量份,更具体地,所述附着力促进剂的含量为6~8重量份。所述附着力促进剂的含量过少则附着力度不够,易出现印刷脱墨现象。
所述表面活性剂可降低表面张力,使涂布时乳液可以均匀成膜,其具体为微晶蜡乳液和阳离子聚丙烯酰胺乳液混合物,所述微晶蜡乳液的重量:阳离子聚丙烯酰胺乳液的重量=(4~6):1;更具体地,所述微晶蜡乳液的重量:阳离子聚丙烯酰胺乳液的重量=5:1。所述表面活性剂的含量为0.1~0.5重量份,更具体地,所述表面活性剂的含量为0.2~0.4重量份。所述表面活性剂的含量过多则会产生大量气泡,不利于涂布。
本申请还提供了所述热敏纸用水性涂布液的制备方法,包括:
按照各组分配比,将改性环氧树脂、羟基丁苯胶乳、羟甲基纤维素和软水混合,再加入附着力促进剂和表面活性剂,得到热敏纸用水性涂布液。
在制备的过程中,所述水性涂布液采用“一锅煮”的方法制备得到,在上述混合的过程中,所述混合采用搅拌的方式进行,所述搅拌的转速为100~500转/min,所述搅拌的时间为30~60min。
在本发明中,改性环氧树脂由环氧基与羧基发生酯化反应改性,使聚合物链间发生交联反应,形成交联网状结构,为涂膜提供网状结构,使涂膜具有良好的物理性能,耐水性好。羧基丁苯胶乳在本发明中起优化防水性的作用。羟甲基纤维素是天然纤维素经碱化、醚化,引入水化羧甲基的线形聚合物,具有良好的成膜性,作为助剂进行产品表面施胶后可以减小纸面的气孔,提高纸张的抗水抗油性。附着力促进剂在本发明中起稳固产品整体附着力的作用。表面活性剂的加入使表面张力降低,使本发明产品在热敏纸上涂布形成的涂膜均匀平整。
为了进一步理解本发明,下面结合实施例对本发明提供的热敏纸用水性涂布液及其制备方法进行详细说明,本发明的保护范围不受以下实施例的限制。
实施例1
采用“一锅煮”的方法,将40份改性环氧树脂、2份羟基丁苯乳胶、4份羟甲基纤维素和58.9份软水置于搅拌反应釜中,开启常温搅拌,速度为100转/分钟,搅拌30分钟后加入5份附着力促进剂和0.1份表面活性剂,搅拌10分钟后即可得到水性涂布液。
将上述得到的水性涂布液涂布于热敏纸基材上,喷墨打印后得到打印样张。测试防水性能优异,涂层不发白,不脱落,防油测试结果为12h不透油。印刷附着力测试结果为标准方法ISO 2409-2013的0级。
防油性能测试方法:将样品制备成长120mm,宽100mm的样品,在25±5℃条件下,在样品正上方20cm的高度滴下1.0g食用油,观察12小时以上,结果以样品背面没有透油为佳
防水性能测试方法:将样品制备成长120mm,宽100mm的样品,在静水压300-800mmH2O且在80℃的水温下涂覆布浸泡2小时,结果以涂层不脱落、不发白为佳。
实施例2
采用“一锅煮”的方法,将45份改性环氧树脂、3份羟基丁苯乳胶、6份羟甲基纤维素和37.7份软水置于搅拌反应釜中,开启常温搅拌,速度为100转/分钟,搅拌30分钟后加入8份附着力促进剂和0.3份表面活性剂,搅拌10分钟后即可得水性涂布液。
将上述得到的水性涂布液涂布于热敏纸基材上,喷墨打印后得到打印样张。测试防水性能优异,涂层不发白,不脱落,防油测试结果为12h不透油。印刷附着力测试结果为标准方法ISO 2409-2013的0级。
实施例3
采用“一锅煮”的方法,将50份改性环氧树脂、8份羟基丁苯乳胶、6份羟甲基纤维素和27.5份软水置于搅拌反应釜中,开启常温搅拌,速度为100转/分钟,搅拌30分钟后加入8份附着力促进剂和0.5份表面活性剂,搅拌10分钟后即可得水性涂布液。
将上述得到的水性涂布液涂布于热敏纸基材上,进行喷墨打印后得到打印样张。测试防水性能优异,涂层不发白,不脱落,防油测试结果为12h不透油。印刷附着力测试结果为标准方法ISO 2409-2013的0级。
对比例1
采用实施例1提供的制备方法,区别在于:不加附着力促进剂;测试防水结果为涂层不发白,不脱落,防油测试结果为12h不透油,附着力为1级。
对比例2
采用实施例1提供的制备方法,区别在于:不加羟甲基纤维素;测试其防水性结果为涂层发白,不脱,防油性结果为12h少量透油,印刷附着力测试结果为标准方法ISO 2409-2013的0级。
对比例3
采用实施例1提供的制备方法,区别在于:将羧基丁苯胶乳的含量改为10份,将水减少至50.9份;测试防水结果为涂层不发白,不脱落,防油测试结果为12h不透油,附着力为2级。
以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。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的前提下,还可以对本发明进行若干改进和修饰,这些改进和修饰也落入本发明权利要求的保护范围内。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (10)
2.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述改性环氧树脂选自环氧改性丙烯酸树脂。
3.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述表面活性剂为质量比为(4~6):1的微晶蜡乳液和阳离子聚丙烯酰胺乳液的混合物。
4.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述改性环氧树脂的含量为40~48重量份。
5.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述羟基丁苯胶乳的含量为3~6重量份。
6.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述羟甲基纤维素的含量为4~8重量份。
7.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述附着力促进剂的含量为6~8重量份。
8.根据权利要求1所述的热敏纸用水性涂布液,其特征在于,所述表面活性剂的含量为0.2~0.4重量份。
9.权利要求1~8任一项所述的热敏纸用水性涂布液的制备方法,包括:
按照各组分配比,将改性环氧树脂、羟基丁苯胶乳、羟甲基纤维素和水混合,再加入附着力促进剂和表面活性剂,得到热敏纸用水性涂布液。
10.根据权利要求9所述的制备方法,其特征在于,所述混合采用搅拌的方式进行,所述搅拌的转速为100~500转/min,所述搅拌的时间为30~60min。
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