CN107268332A - 一种热敏纸及其制备方法 - Google Patents
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Abstract
本发明属于特种纸制备技术领域,具体涉及一种热敏纸及其制备方法。本发明先利用改性酪素乳液对原纸进行预处理,随后将面涂层填料、面涂层粘结剂、显色剂溶液、润滑剂、无色染料溶液与水混合配制成面涂层涂布液,再将保护层填料、有机乳液、硬脂酸锌、异氰酸酯与水混合配制成保护层涂布液,将面涂层涂布液涂布于预处理原纸上,形成面涂层,再将保护层涂布液通涂布于面涂层上,形成保护层后经热风干燥,制得干燥纸张,再将干燥纸张经软压光处理,即得热敏纸,本发明所得热敏纸具有较长的保存期限,热敏纸上发色图文可长期保持清晰,抗褪色能力较强,同时本发明热敏纸机械性能优异,是一种理想的记录用纸。
Description
技术领域
本发明属于特种纸制备技术领域,具体涉及一种热敏纸及其制备方法。
背景技术
热敏纸是一种经过特殊涂层涂布的加工纸,即在纸的表面给予热能,使得显色剂发生物理或化学性质变化而得到图像,达到记录效果的信息用纸。一般来说,热敏纸由原纸、合成纸等作为基材,由填充料、无色染料、显色剂、胶黏剂和增感剂等组分构成的涂层组成。它的发色原理是:当传真机接受记号输入,激发电子束“热头”升温,在某个特定的温度区域内诱导热敏变色层产生化学变化,无色染料分子中的内酯环断开,引起电子迁移生成醌型结构,出现了发色基团,此时立刻显示清晰的文字和图像。热敏纸具有打印装置小巧灵活、打印耗材单一便宜、打印操作简单方便、打印过程安静快速和打印产品精细清晰等特点,因此在电子计算机终端打印、传真通讯记录、各种证券打印、医疗器械及各种测试仪器的终端记录等领域的到广泛应用。
近年来,随着信息技术高速发展,票据打印机技术和条形码技术得到广泛应用,热敏纸由于其独特的性能、快速的产生图像的优越性,在方便的条形码标签、条形码记录信息和票据打印领域方面得到快速增长。但是,相比较其他记录纸,热敏纸也存在一些不足,主要是现有热敏纸的保存期较短、抗褪色能力差,不利于票据、材料等的长期保存。因此,亟待开发一种保存期限长、抗褪色能力较好的热敏纸产品。
发明内容
本发明主要解决的技术问题:针对现有热敏纸存在保存期较短、抗褪色能力差的缺陷,提供了一种热敏纸及其制备方法。
为了解决上述技术问题,本发明所采用的技术方案是:
一种热敏纸,包括原纸,面涂层料和保护层料,其中面涂层料涂布量为6~8g/m2,保护层料涂布量为2~4g/m2;
所述的面涂层料是由以下重量份数的原料组成:10~20份面涂层填料,10~20份面涂层粘结剂,10~40份显色剂溶液,8~10份润滑剂,10~20份无色染料溶液;
所述的保护层料是由以下重量份数的原料组成:20~40份保护层填料,40~50份有机乳液,3~5份硬脂酸锌,10~12份异氰酸酯;
所述的热敏纸具体制备步骤如下:
(1)将面涂层料配制成质量分数为30~40%的面涂层涂布液,通过涂布机将面涂层涂布液涂布于原纸上,控制涂布量为6~8g/m2;
(2)将保护层料配制成质量分数为40~60%的保护层涂布液,通过涂布机将保护层涂布液涂布于面涂层上,控制涂布量为2~4g/m2;
(3)待保护层涂布液涂布结束,经热风干燥至含水率低于8%,得干燥纸张,再经软压光1次,即得热敏纸。
所述的原纸规格为40~50g/m2,厚度4~6μm,pH值5.0~5.4。
所述的原纸还可以为预处理原纸,具体预处理步骤如下:将改性酪素乳液喷涂于原纸正反两面,控制单面涂覆量为2~4g/m2,待涂覆结束,经气流干燥至含水率低于10%,即得预处理原纸;所述的改性酪素乳液为硅烷偶联剂/丙烯酸酯改性酪素乳液。
所述的面涂层填料为镁铝水滑石、煅烧高岭土、气相白炭黑、纳米氧化锌或纳米二氧化钛中的一种。
所述的面涂层粘结剂为丁苯胶乳、羧甲基纤维素、糊化淀粉、聚乙烯醇或壳聚糖中的一种。
所述的显色剂溶液是由以下重量份数的原料配制而成:30~50份2,4-二苯砜基苯酚,4~6份壳聚糖,0.2~0.6份戊二醛,2~4份硼砂和60~80份水。
所述的润滑剂为硬脂酸锌或硬脂酰胺中的一种。
所述的无色染料溶液是由以下重量份数的原料配制而成:30~50份2-苯氨基-3-甲基-6-二丁氨基荧烷,4~6份壳聚糖,0.2~0.5份戊二醛和70~80份水。
所述的保护层填料为轻质碳酸钙或硅烷偶联剂改性纳米二氧化硅中的一种。
所述的有机乳液为固含量10~15%的聚苯乙烯丙烯酸乳液。
本发明的有益效果是:
(1)本发明技术方案首先利用改性酪素乳液对原纸预处理,热敏纸所用原纸中含有害成分,在使用过程中,原纸中有害成分会对热敏显色层产生不利影响,导致热敏纸保存期短,抗褪色能力差,而酪素主要成分为含磷蛋白质,含有氨基、亚氨基、羧基等多种官能团,可与原纸中纤维形成牢固的化学键,在原纸正反两面形成粘着力强,耐高温和抗磨屏蔽层,可有效屏蔽原纸中有害成分对显色颜料的干扰,且能充当连接料的角色,提高原纸与面涂层的结合强度,从而使产品热敏纸保存期有效延长,抗褪色能力得以提高; (2)本发明通过加入硼砂,避免产品在存放过程中发生变质,同时辅以壳聚糖和戊二醛,可在制备过程中在体系中形成三维交联网络,提高涂布后的涂层结合强度,使显色剂和无色染料稳定分散于体系中形成的三维交联网络中,对显色剂和无色染料起到一定的保护作用,避免在存放过程中失效,提高其保存期。
具体实施方式
按重量份数计,在带搅拌器的三口烧瓶中依次加入20~40份酪素,8~10份三乙醇胺,80~120份去离子水,于温度为60~65℃,转速为300~500r/min条件下,恒温搅拌混合2~4h,再依次加入去离子水等质量的丙烯酸酯乳液,酪素质量0.5~0.8倍的硅烷偶联剂KH-570,继续恒温搅拌反应2~3h,得硅烷偶联剂/丙烯酸酯改性酪素乳液,再将所得硅烷偶联剂/丙烯酸酯改性酪素乳液均匀喷涂于原纸正反两面,控制单面涂覆量为2~4g/m2,待涂覆结束,将涂覆后的原纸经气流干燥至含水率低于10%,得预处理原纸,再按重量份数计,依次取10~20份面涂层填料,10~20份面涂层粘结剂,10~40份显色剂溶液,8~10份润滑剂,10~20份无色染料溶液,与水混合配制成质量分数为30~40%的面涂层涂布液,随后按重量份数计,依次取20~40份保护层填料,40~50份有机乳液,3~5份硬脂酸锌,10~12份异氰酸酯,与水混合配制成质量分数为40~60%的保护层涂布液,再将所得面涂层涂布液通过涂布机涂布于预处理原纸上,控制涂布量为6~8g/m2,形成面涂层,随后将所得保护层涂布液通过涂布机涂布于面涂层上,控制涂布量为2~4g/m2,形成保护层,将形成保护层后的原纸经60~65℃热风干燥至含水率低于8%,得干燥纸张,再将所得干燥纸张在2~4N/mm的线压力下软压光1次,即得热敏纸。所述的原纸规格为40~50g/m2,厚度4~6μm,pH值5.0~5.4。所述的面涂层填料为镁铝水滑石、煅烧高岭土、气相白炭黑、纳米氧化锌或纳米二氧化钛中的一种。所述的面涂层粘结剂为丁苯胶乳、羧甲基纤维素、糊化淀粉、聚乙烯醇或壳聚糖中的一种。所述的显色剂溶液是由以下重量份数的原料配制而成:30~50份2,4-二苯砜基苯酚,4~6份壳聚糖,0.2~0.6份戊二醛,2~4份硼砂和60~80份水。所述的润滑剂为硬脂酸锌或硬脂酰胺中的一种。所述的无色染料溶液是由以下重量份数的原料配制而成:30~50份2-苯氨基-3-甲基-6-二丁氨基荧烷,4~6份壳聚糖,0.2~0.5份戊二醛和70~80份水。所述的保护层填料为轻质碳酸钙或硅烷偶联剂改性纳米二氧化硅中的一种。所述的有机乳液为固含量10~15%的聚苯乙烯丙烯酸乳液。
实例1
按重量份数计,依次取10份镁铝水滑石,10份丁苯胶乳,10份显色剂溶液,8份润滑剂,10份无色染料溶液,与水混合配制成质量分数为30%的面涂层涂布液,随后按重量份数计,依次取20份轻质碳酸钙,40份固含量为15%的聚苯乙烯丙烯酸乳液,3份硬脂酸锌,10份异氰酸酯,与水混合配制成质量分数为40%的保护层涂布液,再将所得面涂层涂布液通过涂布机涂布于原纸上,控制涂布量为6g/m2,形成面涂层,随后将所得保护层涂布液通过涂布机涂布于面涂层上,控制涂布量为2g/m2,形成保护层,将形成保护层后的原纸经60℃热风干燥至含水率为7%,得干燥纸张,再将所得干燥纸张在2N/mm的线压力下软压光1次,即得热敏纸。所述的原纸规格为40g/m2,厚度4μm,pH值5.0。所述的显色剂溶液是由以下重量份数的原料配制而成:50份2,4-二苯砜基苯酚,6份壳聚糖,0.6份戊二醛,4份硼砂和80份水。所述的润滑剂为硬脂酸锌或硬脂酰胺中的一种。所述的无色染料溶液是由以下重量份数的原料配制而成:50份2-苯氨基-3-甲基-6-二丁氨基荧烷,6份壳聚糖,0.5份戊二醛和80份水。
实例2
按重量份数计,在带搅拌器的三口烧瓶中依次加入20份酪素,8份三乙醇胺,80份去离子水,于温度为60℃,转速为300r/min条件下,恒温搅拌混合2h,再依次加入去离子水等质量的丙烯酸酯乳液,酪素质量0.5倍的硅烷偶联剂KH-570,继续恒温搅拌反应2h,得硅烷偶联剂/丙烯酸酯改性酪素乳液,再将所得硅烷偶联剂/丙烯酸酯改性酪素乳液均匀喷涂于原纸正反两面,控制单面涂覆量为2g/m2,待涂覆结束,将涂覆后的原纸经气流干燥至含水率为9%,得预处理原纸,再按重量份数计,依次取10份镁铝水滑石,10份丁苯胶乳,10份显色剂溶液,8份润滑剂,10份无色染料溶液,与水混合配制成质量分数为30%的面涂层涂布液,随后按重量份数计,依次取20份轻质碳酸钙,40份固含量为15%的聚苯乙烯丙烯酸乳液,3份硬脂酸锌,10份异氰酸酯,与水混合配制成质量分数为40%的保护层涂布液,再将所得面涂层涂布液通过涂布机涂布于预处理原纸上,控制涂布量为6g/m2,形成面涂层,随后将所得保护层涂布液通过涂布机涂布于面涂层上,控制涂布量为2g/m2,形成保护层,将形成保护层后的原纸经60℃热风干燥至含水率为7%,得干燥纸张,再将所得干燥纸张在2N/mm的线压力下软压光1次,即得热敏纸。所述的原纸规格为40g/m2,厚度4μm,pH值5.0。所述的显色剂溶液是由以下重量份数的原料配制而成:50份2,4-二苯砜基苯酚,6份壳聚糖,0.6份戊二醛,4份硼砂和80份水。所述的润滑剂为硬脂酸锌或硬脂酰胺中的一种。所述的无色染料溶液是由以下重量份数的原料配制而成:50份2-苯氨基-3-甲基-6-二丁氨基荧烷,6份壳聚糖,0.5份戊二醛和80份水。
对比例:张家港市某纸业有限公司生产的热敏纸。
对本发明实例1~2制得的热敏纸和对比例的热敏纸进行性能检测,其检测结果如表1所示:
表1
保存期限:将打印发色后的热敏纸于温度为35℃,相对空气湿度为85%,且不受日光直接照射、避免与化学药品接触的环境中静置保存,观察热敏纸上发色图文保持清晰的年限,即为热敏纸保存期限。
综上所述,本发明制得的热敏纸具有较长的保存期限,热敏纸上发色图文可长期保持清晰,抗褪色能力较强,同时本发明热敏纸机械性能优异,是一种理想的记录用纸。
Claims (10)
1.一种热敏纸,包括原纸,面涂层料和保护层料,其中面涂层料涂布量为6~8g/m2,保护层料涂布量为2~4g/m2;
其特征在于,所述的面涂层料是由以下重量份数的原料组成:10~20份面涂层填料,10~20份面涂层粘结剂,10~40份显色剂溶液,8~10份润滑剂,10~20份无色染料溶液;
所述的保护层料是由以下重量份数的原料组成:20~40份保护层填料,40~50份有机乳液,3~5份硬脂酸锌,10~12份异氰酸酯;
所述的热敏纸具体制备步骤如下:
(1)将面涂层料配制成质量分数为30~40%的面涂层涂布液,通过涂布机将面涂层涂布液涂布于原纸上,控制涂布量为6~8g/m2;
(2)将保护层料配制成质量分数为40~60%的保护层涂布液,通过涂布机将保护层涂布液涂布于面涂层上,控制涂布量为2~4g/m2;
(3)待保护层涂布液涂布结束,经热风干燥至含水率低于8%,得干燥纸张,再经软压光1次,即得热敏纸。
2.根据权利要求1所述的热敏纸,其特征在于:所述的原纸规格为40~50g/m2,厚度4~6μm,pH值5.0~5.4。
3.根据权利要求1或2所述的热敏纸,其特征在于:所述的原纸还可以为预处理原纸,具体预处理步骤如下:将改性酪素乳液喷涂于原纸正反两面,控制单面涂覆量为2~4g/m2,待涂覆结束,经气流干燥至含水率低于10%,即得预处理原纸;所述的改性酪素乳液为硅烷偶联剂/丙烯酸酯改性酪素乳液。
4.根据权利要求1所述的热敏纸,其特征在于:所述的面涂层填料为镁铝水滑石、煅烧高岭土、气相白炭黑、纳米氧化锌或纳米二氧化钛中的一种。
5.根据权利要求1所述的热敏纸,其特征在于:所述的面涂层粘结剂为丁苯胶乳、羧甲基纤维素、糊化淀粉、聚乙烯醇或壳聚糖中的一种。
6.根据权利要求1所述的热敏纸,其特征在于:所述的显色剂溶液是由以下重量份数的原料配制而成:30~50份2,4-二苯砜基苯酚,4~6份壳聚糖,0.2~0.6份戊二醛,2~4份硼砂和60~80份水。
7.根据权利要求1所述的热敏纸,其特征在于:所述的润滑剂为硬脂酸锌或硬脂酰胺中的一种。
8.根据权利要求1所述的热敏纸,其特征在于:所述的无色染料溶液是由以下重量份数的原料配制而成:30~50份2-苯氨基-3-甲基-6-二丁氨基荧烷,4~6份壳聚糖,0.2~0.5份戊二醛和70~80份水。
9.根据权利要求1所述的热敏纸,其特征在于:所述的保护层填料为轻质碳酸钙或硅烷偶联剂改性纳米二氧化硅中的一种。
10.根据权利要求1所述的热敏纸,其特征在于:所述的有机乳液为固含量10~15%的聚苯乙烯丙烯酸乳液。
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