CN106120430A - 一种耐机械浆的热敏纸 - Google Patents

一种耐机械浆的热敏纸 Download PDF

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CN106120430A
CN106120430A CN201610487798.6A CN201610487798A CN106120430A CN 106120430 A CN106120430 A CN 106120430A CN 201610487798 A CN201610487798 A CN 201610487798A CN 106120430 A CN106120430 A CN 106120430A
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heat
sensitive paper
coating
parts
paper
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李奕廷
陈汉彬
李娟�
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Gold HuaSheng Paper (SuZhou Industrial Park) Co Ltd
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Abstract

本发明公开了一种耐机械浆的热敏纸。所述耐机械浆的热敏纸是由原纸层、底涂层及面涂层组成。其中原纸层为含有机械浆成份的原纸，在原纸层上面依次有涂布底涂层和面涂层。本发明解决了传统热敏纸中，原纸含有机械浆的热敏纸张，在高温高湿的条件下存放长时间后，造成的热敏打印不良问题。

Description

一种耐机械浆的热敏纸
技术领域
本发明涉及造纸技术领域，具体涉及一种耐机械浆的热敏纸。
背景技术
近年来，热敏纸张的使用范围越来越广泛。从一般生活常见的收银单、票据单、物流标签，超市里的食品标签、计量标签，甚至交通票据等等，越来越多的范围都可以见到热敏纸张的使用。
在大幅增加的热敏纸张的需求量中，中低端产品为主流，同时伴随着国内的低价竞争，使得许多热敏纸厂纷纷选用成本较低廉的机械浆，降低原纸的成本。然而，中低端产品中所使用的显色剂多为2，2-二(4-羟基苯基)丙烷(BPA)，这些使用2，2-二(4-羟基苯基)丙烷作为显色剂的热敏纸张，在常温下长时间保存时，显色剂的功能性会被机械浆中的化学物质慢慢影响，导致纸张发色变淡甚至无法读取。
发明内容
为解决以上技术问题，本发明提供了一种耐机械浆的热敏纸，其在高温高湿的条件下存放长时间后，热敏打印良好，发色保存率高。
为实现上述技术目的，本发明的技术方案如下：一种耐机械浆的热敏纸，由原纸层、底涂层及面涂层组成；原纸层为含有机械浆成份的原纸，在原纸层上依次涂覆底涂层和面涂层；所述底涂层的组成为：填料50％～90％、胶黏剂5％～25％及助剂0％～5％；所述面涂层的组成为：填料20％～50％、胶黏剂5％～25％、显色剂15％～45％、增感剂15％～40％、无色染料5％～25％、润滑剂5％～15％及助剂1～5％。
其中，所述填料为轻质碳酸钙、煅烧高岭土、片状瓷土、塑性颜料中的一种或多种。
其中，所述胶黏剂为胶乳、淀粉、聚乙烯醇中的一种或多种。
其中，所述胶乳为苯丙烯酸胶乳、苯乙烯丙烯酸树脂、丁苯胶乳中的一种或多种。
其中，所述助剂为分散剂、增粘剂、消泡剂中的一种或多种。
其中，所述显色剂溶液为以显色剂30～40份、聚乙烯醇3～4份，混合配制面成的32％～42％浓度的混合液；所述显色剂为4，4′-磺酰基双[2-(2-丙烯基)]苯酚、2，4二苯砜基苯酚、4-羟基-4′异丙氧基二苯砜中的一种或多种。
其中，所述增感剂溶液为以增感剂30～40份、聚乙烯醇3～4份，混合配制而成的32％～42％浓度的混合液；所述增感剂为乙二醇二苯醚、二苯砜中的至少一种。
其中，所述无色染料溶液为以无色染料30～40份、聚乙烯醇3～4份，混合配制成的38％～48％浓度的混合液；所述无色染料为2-苯氨基-6-二丁氨基-3-甲基-荧烷、2-(2-4-二甲苯胺基)-3-甲基-6-二乙氨基荧烷中的至少一种。
其中，所述面涂层的润滑剂为硬脂酸锌、硬脂酸钙、石蜡中的一种或多种。
本发明还提供所述耐机械浆的热敏纸的制备方法，按照所述底涂层的组成配制成底涂层涂布液，以涂布机将所述底涂层涂布液涂布于含有机械浆的原纸层上，涂布量为3～9g/m2；
按照所述面涂层的组成配制成面涂层涂布液，以涂布机将所述面涂层涂布液涂布于底涂层上，涂布量为4～10g/m2。
所述底涂层的组成为：填料50％～90％、胶黏剂5％～25％及助剂0％～5％；所述面涂层的组成为：填料20％～50％、胶黏剂5％～25％、显色剂溶液15％～45％、增感剂溶液15％～40％、无色染料溶液5％～25％、润滑剂5％～15％及助剂1～5％。
所述底涂层涂布液浓度为20％～40％。
所述面涂层涂布液浓度为20％～35％。
所述填料为轻质碳酸钙、煅烧高岭土、片状瓷土、塑性颜料中的一种或多种。
所述胶黏剂为胶乳、淀粉、聚乙烯醇中的一种或多种。
所述胶乳为苯丙烯酸胶乳、苯乙烯丙烯酸树脂、丁苯胶乳中的一种或多种。
所述助剂为分散剂、增粘剂、消泡剂中的一种或多种。
所述显色剂溶液为：显色剂30～40份、聚乙烯醇3～4份，混合配制成32％～42％浓度的混合液，在湿式研磨机中研磨到0.3～1.5微米的混合液。
所述增感剂溶液为：增感剂30～40份、聚乙烯醇3～4份，混合配制成32％～42％浓度的混合液，在湿式研磨机中研磨到0.2～1.7微米的混合液。
所述无色染料溶液为：无色染料30～40份、聚乙烯醇3～4份，混合配制成38％～48％浓度的混合液，在湿式研磨机中研磨到0.2～1.2微米的混合液。
本发明选用感热材料作为显色剂，相较国内主流中低端市场产品所使用的显色剂，更环保且稳定性更佳，解决了传统的原纸含有机械浆的热敏纸张，在高温高湿的条件下存放长时间后造成的热敏打印不良问题。本发明的热敏纸可以在60℃，90％RH(高温高湿)的条件下存放100小时后，不受原纸中机械浆的影响，热敏打印仍有优异的发色能力。
具体实施方式
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本发明所限定的范围。
实施例1
底涂层涂料制备：煅烧高岭土与丙烯酸塑性颜料1∶1混合，添加量为总量的80％，聚乙烯醇添加量为总量的8％，丁苯胶乳添加量为总量的10％，及2％的助剂(分散剂、增粘剂、消泡剂)，配置成浓度30％的底涂层涂布液。以涂布机将上述的底涂层涂布液涂布于含有机械浆原纸层上，涂布量为7g/m2。
制备显色剂溶液：4，4′-磺酰基双[2-(2-丙烯基)]苯酚38份、聚乙烯醇3.5份，混合配制成38％浓度的显色剂混合液，在湿式研磨机中研磨到1.0微米的显色剂混合液。
制备增感剂溶液：二苯砜38份、聚乙烯醇3.5份，混合配制成38％浓度的增感剂混合液，在湿式研磨机中研磨到1.0微米的增感剂混合液。
制备无色染料溶液：2-苯氨基-6-二丁氨基-3-甲基-荧烷38份、聚乙烯醇3.5份，混合配制成38％浓度的无色染料混合液，在湿式研磨机中研磨到0.8微米的无色染料混合液。
面涂层涂料制备：煅烧高岭土与丙烯酸塑性颜料1∶1混合，添加量为总量的25％，丁苯胶乳添加量为总量的9％，上述显色剂溶液添加量为总量的23％，上述增感剂溶液添加量为总量的23％，上述无色染料溶液添加量为总量的13％，石蜡添加量为总量的6％及1％的助剂(分散剂、增粘剂、消泡剂)。配置成浓度30％的面涂层涂布液。以涂布机将上述的面涂层涂布液涂布于面涂层上，涂布量为6.5g/m2。
实施例2
底涂层涂料制备：煅烧高岭土与丙烯酸塑性颜料1∶1混合，添加量为总量的75％，聚乙烯醇添加量为总量的10％，丁苯胶乳添加量为总量的12％，及3％助剂(分散剂、增粘剂、消泡剂)。配置成浓度为32％的底涂层涂布液。以涂布机将上述的底涂层涂布液涂布于含有机械浆原纸层上，涂布量为8g/m2。
制备显色剂溶液为：4-羟基-4′异丙氧基二苯砜40份、聚乙烯醇3.5份，混合配制成38％浓度的显色剂混合液，在湿式研磨机中研磨到0.8微米的显色剂混合液。
制备增感剂溶液为：二苯砜40份、聚乙烯醇3.5份，混合配制成38％浓度的增感剂混合液，在湿式研磨机中研磨到1.2微米的增感剂混合液。
制备无色染料溶液为：2-苯氨基-6-二丁氨基-3-甲基-荧烷38份、聚乙烯醇3.5份，混合配制成38％浓度的无色染料混合液，在湿式研磨机中研磨到0.8微米的无色染料混合液。
面涂层涂料制备：轻质碳酸钙与丙烯酸塑性颜料1∶1混合，添加量为总量的25％，丁苯胶乳添加量为总量的11％，上述显色剂溶液添加量为总量的23％，上述增感剂溶液添加量为总量的23％，上述无色染料溶液添加量为总量的12％，石蜡添加量为总量的5％及1％助剂(分散剂、增粘剂、消泡剂)。配置成浓度为28％的面涂层涂布液。以涂布机将上述的面涂层涂布液涂布于面涂层上，涂布量为6.0g/m2。
对比例1
底涂层涂料制备：煅烧高岭土与丙烯酸塑性颜料1∶1混合，添加量为总量的80％，聚乙烯醇添加量为总量的8％，丁苯胶乳添加量为总量的9％，及3％助剂(分散剂、增粘剂、消泡剂)。配置成浓度在32％底涂涂布液。以涂布机将上述的底涂层涂布液涂布于含有机械浆原纸层上，涂布量为7g/m2。
制备显色剂溶液为：2，2-二(4-羟基苯基)丙烷38份、聚乙烯醇3.5份，混合配制成38％浓度的显色剂混合液，在湿式研磨机中研磨到1.2微米的显色剂混合液。
制备增感剂溶液为：苯甲基2-萘基醚38份、聚乙烯醇3.5份，混合配制成38％浓度的增感剂混合液，在湿式研磨机中研磨到1.2微米的增感剂混合液。
制备无色染料溶液为：2-苯氨基-6-二丁氨基-3-甲基-荧烷38份、聚乙烯醇3.5份，混合配制成38％浓度的无色染料混合液，在湿式研磨机中研磨到0.8微米的无色染料混合液。
面涂层涂料制备：片状瓷土与丙烯酸塑性颜料1∶1混合，添加量为总量的25％，丁苯胶乳添加量为总量的10％，上述显色剂溶液添加量为总量的23％，上述增感剂溶液添加量为总量的23％，上述无色染料溶液添加量为总量的12％，石蜡添加量为总量的6％及1％助剂(分散剂、增粘剂、消泡剂)。配置成浓度在28％面涂涂布液。以涂布机将上述的面涂层涂布液涂布于面涂层上，涂布量为6.0g/m2。
将以上述实施例1、实施例2于含有机械浆的原纸层上进行涂布，制成底涂层及面涂层涂布的成纸。使用TH-M2/N2动发色仪打印黑色块，并使用光密度仪测量发色密度。在60℃，90％RH(高温高湿)条件下进行加速老化100小时后，再次使用光密度仪测量先前使用TH-M2/N2动发色仪打印黑色块位置的发色密度，计算其发色密度保存率可达80％以上。
上述发色密度保存率(％)计算方式为：(打印完存放前的黑色块发色密度)/(打印完存放后的黑色块发色密度)*100％。
将以上述对比例于含有机械浆原纸层上进行涂布，制成底涂层及面涂层涂布的成纸。使用TH-M2/N2动发色仪打印黑色块，并使用光密度仪测量发色密度。在60℃，90％RH(高温高湿)条件下进行加速老化100小时后，再次使用光密度仪测量先前使用TH-M2/N2动发色仪打印黑色块位置的发色密度，计算其发色密度保存率仅在50％以下。
说明实施例1、实施例2的纸样在耐机械浆的性能有明显的改善。
本发明选用感热材料作为显色剂，环保且稳定性佳，解决了传统的原纸含有机械浆的热敏纸张，在高温高湿的条件下存放长时间后造成的热敏打印不良问题。本发明的热敏纸可以在60℃，90％RH(高温高湿)的条件下存放100小时后，不受原纸中机械浆的影响，热敏打印仍有优异的发色能力。
以上为对本发明实施例的描述，通过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 (9)

1.一种耐机械浆的热敏纸，由原纸层、底涂层及面涂层组成，原纸层为含有机械浆成份的原纸，在原纸层上依次涂覆底涂层和面涂层，其特征在于，所述底涂层的组成为：填料50％～90％、胶黏剂5％～25％及助剂0％～5％；
所述面涂层的组成为：填料20％～50％、胶黏剂5％～25％、显色剂溶液15％～45％、增感剂溶液15％～40％、无色染料溶液5％～25％、润滑剂5％～15％及助剂1～5％。
2.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述填料为轻质碳酸钙、煅烧高岭土、片状瓷土、塑性颜料中的一种或多种。
3.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述胶黏剂为胶乳、淀粉、聚乙烯醇中的一种或多种。
4.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述助剂为分散剂、增粘剂、消泡剂中的一种或多种。
5.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述显色剂溶液为以显色剂30～40份、聚乙烯醇3～4份，混合配制面成的32％～42％浓度的混合液；所述显色剂为4，4′-磺酰基双[2-(2-丙烯基)]苯酚、2，4二苯砜基苯酚、4-羟基-4′异丙氧基二苯砜中的一种或多种。
6.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述增感剂溶液为以增感剂30～40份、聚乙烯醇3～4份，混合配制而成的32％～42％浓度的混合液；所述增感剂为乙二醇二苯醚、二苯砜中的至少一种。
7.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述无色染料溶液为以无色染料30～40份、聚乙烯醇3～4份，混合配制成的38％～48％浓度的混合液；所述无色染料为2-苯氨基-6-二丁氨基-3-甲基-荧烷、2-(2-4-二甲苯胺基)-3-甲基-6-二乙氨基荧烷中的至少一种。
8.如权利要求1所述的耐机械浆的热敏纸，其特征在于，所述面涂层的润滑剂为硬脂酸锌、硬脂酸钙、石蜡中的一种或多种。
9.如权利要求1～8任一项所述的耐机械浆的热敏纸的制备方法，其特征在于，按照所述底涂层的组成配制成底涂层涂布液，以涂布机将所述底涂层涂布液涂布于含有机械浆的原纸层上，涂布量为3～9g/m2；
按照所述面涂层的组成配制成面涂层涂布液，以涂布机将所述面涂层涂布液涂布于底涂上，涂布量为4～10g/m2。
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