CN106380962A - 一种水性树脂基热转印色带及其制备方法 - Google Patents
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Abstract
本发明公开了一种水性树脂基热转印色带及其制备方法，该热转印色带包括承载基材，耐热爽滑背涂，释放层和粘附层，所述释放层包括水性蜡乳液、水性树脂乳液、表面活性剂和去离子水，所述粘附层包括水性树脂乳液、水性蜡乳液、无机颜料、分散剂、表面活性剂和去离子水，其中粘附层的黏度在2000‑10000CPS，释放层的黏度在100‑500CPS。本发明热转印色带的释放层和粘附层中所用的乳液全部为水性乳液，不添加任何有机溶剂，环保无污染。
Description
技术领域
本发明涉及一种热转印色带，具体涉及一种水性树脂基热转印色带。
背景技术
树脂基色带含有较高比例的树脂成分，打印需要的能级相比于蜡基和混合基要高，但具有最优异的耐磨耐刮擦性能，且印迹质量更为优秀。主要适用于用PET(聚酯)、PVC(聚氯乙烯)、PE(聚乙烯)、BOPP(聚丙烯)等为材料的高档标签。
目前大多数的树脂基热转印色带仍为溶剂型，如专利名称为“一种热转印色带及其制备方法”，专利号为200510008696.3的中国专利中公开了一种溶剂型树脂基热转印色带的制备方法。在生产过程中，运用了大量的丁酮、环己酮、乙酸乙酯等溶剂，这将会对环境造成严重的污染，同时也危害到生产人员的身体健康。另外，溶剂的回收和后处理也大大增加了产品生产制造的成本，不利于市场竞争。近年来，人们环保意识渐渐提高，限制可挥发性物质排放量(VOC)已在各国相继成为法规，溶剂使用受限已经成为一种必然的趋势。
在热转印色带生产行业中，几乎没有企业能够做到全水性原料生产，或者以全水性材料为原料的产品质量远远未能达到溶剂型材料为原料生产的产品。
发明内容
为解决上述问题，本发明提出一种水性树脂基热转印色带及其制备方法。使用本发明方法制得的水性树脂基热转印色带质量优异，且工艺相对简单、环保。
具体而言，一方面，本发明提供一种水性树脂基热转印色带，该热转印色带包括承载基材，耐热爽滑背涂，释放层和粘附层，所述释放层包括水性蜡乳液、水性树脂乳液、表面活性剂和去离子水，所述粘附层包括水性树脂乳液、水性蜡乳液、无机颜料、分散剂、表面活性剂和去离子水，其中粘附层的黏度在2000-10000CPS，释放层的黏度在100-500CPS。
优选的，本发明热转印色带的释放层物料配比如下：水性蜡乳液为10％-60％，水性树脂乳液为20％-50％，表面活性剂为0.5％-2.5％，其余为去离子水。
更优选的，本发明热转印色带的释放层物料配比如下：水性蜡乳液为10％-40％，水性树脂乳液为20％-30％，表面活性剂为0.5％-1.5％，其余为去离子水。
优选的，本发明热转印色带的粘附层物料配比如下：水性树脂乳液40％-60％，水性蜡乳液2％-10％，无机颜料5％-10％，分散剂2％-3％，表面活性剂0.5％-2.5％，其余为去离子水。
更优选的，本发明热转印色带的粘附层物料配比如下：水性树脂乳液40％-50％，水性蜡乳液4％-8％，无机颜料6％-8％，分散剂2％-2.5％，表面活性剂1％-2％，其余为去离子水。
优选的，本发明热转印色带的释放层和粘附层中的水性蜡乳液选自水性巴西蜡乳液或其复合的水性蜡乳液、水性小烛树蜡乳液或其复合的水性蜡乳液；更优选的是，选自水性巴西蜡乳液。
优选的，本发明热转印色带的释放层所用的水性树脂乳液选自水性EVA树脂乳液、水性EEA树脂乳液或水性丙烯酸树脂乳液；更优选的，选自水性EVA树脂乳液和/或水性丙烯酸树脂乳液。
优选的，本发明热转印色带的粘附层所用的水性树脂乳液选自水性氯乙烯共聚物乳液或水性聚酯乳液；更优选的，水性聚酯乳液选自聚对苯二甲酸乙二醇酯乳液。
优选的，本发明热转印色带所采用的无机颜料为炭黑，表面活性剂surfynol 104，分散剂为ZetaSperse 3400。
优选的，本发明热转印色带所采用的承载基材为聚酯薄膜，厚度为3-10μm。
另一方面，本发明还提供了一种水性树脂基热转印色带的制备方法，其特征在于，包括以下步骤：
a、将水性蜡乳液、水性树脂乳液、表面活性剂和去离子水分散均匀，用去离子水调节黏度和固含量，制成释放层乳液；
b、将释放层乳液涂布在带有耐热爽滑背涂层的承载基材上；
c、将水性树脂乳液、水性蜡乳液、无机颜料、分散剂、表面活性剂和去离子水分散均匀，研磨，用去离子水调节粘度和固含量，制成粘附层乳液；
d、将粘附层乳液涂布于已涂好释放层的承载基材上，制得水性树脂基热转印色带。
本发明粘附层乳液经研磨后的细度小于2.5μm，温度10-20℃，目的是使涂布时膜面更加均匀、细腻，打印时图案更加清晰。
本发明热转印色带的粘附层含有高比例的高分子树脂材料，在应用时黏度在2000-10000CPS，而释放层主体为水性蜡乳液，在应用时的黏度在100-500CPS，由于两者在不同数量级上的黏度，转印时不会相互渗透，靠释放层释放，粘附层的粘性，最终能够得到非常清晰的转印文字和图像。
本发明热转印色带的释放层和粘附层也可都选用高比例的高分子树脂材料，使释放层和粘附层在应用时，其黏度都保持在一个较高的水平，转印时同样不会相互渗透，主要靠粘附层的高极性，高粘性，使其能够带着释放层一起吸附在各种材料上，最终能够得到非常清晰的转印文字和图像。
本发明还提出了一种增加产品耐溶剂擦拭性能的方案，即在释放层中的树脂材料选择了在一定温度及环境的条件下，能够自交联的材料，转印后，释放层在图像或文字的表层覆盖，由于该种树脂的自交联作用，在其表面形成了一层保护膜，为产品提供了优良的耐磨耐刮擦性能和耐溶剂擦拭能力。
优选的，所述自交联作用的是树脂为水性丙烯酸树脂。
本发明还提出了另一种增加产品耐溶剂擦拭性能的方案，可以在释放层中添加热引发的交联剂，转印后，释放层在图像或文字的表层覆盖，由于交联剂的作用，在其表面形成了一层保护膜，为产品提供了优良的耐磨耐刮擦性能和耐溶剂擦拭能力。
具体实施方式
下面结合实施例对本发明作更进一步的说明，但本发明的实施方式不限于此。以下实施例中，释放层乳液粘度范围为100-500CPS，粘附层乳液粘度范围为2000-10000CPS；粘附层和释放层中使用的水性蜡乳液均为水性巴西蜡乳液，水性聚酯乳液为聚对苯二甲酸乙二醇酯乳液(PET)，表面活性剂均为美国空气化工公司的surfynol 104，分散剂为美国空气化工公司的ZetaSperse 3400。下述实施例中所使用的实验方法如无特殊说明，均为常规方法，所述组分的用量均以重量份计。
实施例1
将10重量份水性蜡乳液、15重量份水性EVA树脂乳液、35份水性丙烯酸树脂乳液、1重量份的表面活性剂和39重量份去离子水混合搅拌，分散均匀，制得释放层涂布液；设定涂布机的烘道温度为80℃，将释放层涂布液涂于带有耐热爽滑背涂层的厚度为4.5μm的聚酯薄膜上，涂布量为1g/m2，得到带有释放层的基材。
将45重量份水性氯乙烯共聚物乳液、5重量份水性蜡乳液、2.5重量份分散剂、1.5重量份表面活性剂、8重量份炭黑和38重量份去离子水混合搅拌，分散均匀，研磨至细度2.5μm以下制成粘附层涂布液；设定涂布机的烘道温度为90℃，将粘附层涂布液涂于涂有释放层的基材上，涂布量为1g/m2，得到水性树脂基热转印色带。
实施例2
将40重量份水性蜡乳液、10重量份水性EVA树脂乳液、10重量份水性丙烯酸树脂乳液、1重量份表面活性剂和39份去离子水混合搅拌，分散均匀，制得释放层涂布液；设定涂布机的烘道温度为80℃，将释放层涂布液涂于带有耐热爽滑背涂层的厚度为4.5μm的聚酯薄膜上，涂布量为1g/m2，得到带有释放层的基材。
将45重量份水性聚酯乳液、5重量份水性蜡乳液、2.5重量份分散剂、1.5重量份表面活性剂、8重量份炭黑和38重量份去离子水混合搅拌，分散均匀，研磨至细度2.5μm以下制成粘附层涂布液；设定涂布机的烘道温度为90℃，将粘附层涂布液涂于涂有释放层的基材上，涂布量为1g/m2，得到水性树脂基热转印色带。
实施例3
将30重量份水性蜡乳液、15重量份水性EVA树脂乳液、15重量份水性丙烯酸树脂乳液、1重量份表面活性剂和39份去离子水混合搅拌，分散均匀，制得释放层涂布液；设定涂布机的烘道温度为80℃，将释放层涂布液涂于带有耐热爽滑背涂层的厚度为4.5μm的聚酯薄膜上，涂布量为1g/m2，得到带有释放层的基材。
将45重量份水性聚酯乳液、5重量份水性蜡乳液、2.5重量份分散剂、1.5重量份表面活性剂、8重量份炭黑和38重量份去离子水混合搅拌，分散均匀，研磨至细度2.5μm以下制成粘附层涂布液；设定涂布机的烘道温度为90℃，将粘附层涂布液涂于涂有释放层的基材上，涂布量为1g/m2，得到水性树脂基热转印色带。
试验例1 本发明热转印色带打印效果试验
分别取实施例1-3制备的热转印色带，用热转印打印机在艾利公司的哑银标签纸上打印英文Arial字体“F”(16字号、12字号、10字号)、中文宋体“型”(12字号)以及横向和竖向细条码，观察打印后字符的印迹清晰度，试验结果见表1。
用耐磨耗试验机分别考察上述打印纸的印迹耐擦性，其中试验机的杠杆一头固定1mm的钢珠，杠杆施加2kg负荷；测试时杠杆带动钢珠在打印纸的字迹上来回匀速拖动，记录字迹被擦糊时拖动的次数，试验结果见表1。
表1 本发明热转印色带打印印迹清晰度和耐擦性测试结果
| 试验组 | 印迹清晰度 | 印迹耐擦性 |
| 实施例1 | 非常清晰 | 240次 |
| 实施例2 | 非常清晰 | 252次 |
| 实施例3 | 非常清晰 | 228次 |
由表1可知，采用本发明热转印色带打印字符的印迹清晰，色泽无突变，轮廓分明，无明显污点，印迹耐擦性良好，各项指标均符合热转印色带通用规范的标准。
以上实例是对本发明的说明，但其并非用以限定本发明的保护范围，任何熟悉该项技术的技术人员，在不脱离本发明的构思和范围内所做的更改与润饰，均应属于本发明的保护范围。
Claims (9)
1.一种水性树脂基热转印色带，其特征在于，该热转印色带包括承载基材，耐热爽滑背涂，释放层和粘附层，所述释放层包括水性蜡乳液、水性树脂乳液、表面活性剂和去离子水，所述粘附层包括水性树脂乳液、水性蜡乳液、无机颜料、分散剂、表面活性剂和去离子水，其中粘附层的黏度在2000-10000CPS，释放层的黏度在100-500CPS。
2.根据权利要求1所述的热转印色带，其特征在于，所述释放层物料配比如下：水性蜡乳液为10％-60％，水性树脂乳液为20％-50％，表面活性剂为0.5％-2.5％，其余为去离子水。
3.根据权利要求1所述的热转印色带，其特征在于，所述粘附层物料配比如下：水性树脂乳液40％-60％，水性蜡乳液2％-10％，无机颜料5％-10％，分散剂2％-3％，表面活性剂0.5％-2.5％，其余为去离子水。
4.根据权利要求1所述的热转印色带，其特征在于，所述释放层和粘附层中的水性蜡乳液选自水性巴西蜡乳液或其复合的水性蜡乳液、水性小烛树蜡乳液或其复合的水性蜡乳液，优选为水性巴西蜡乳液。
5.根据权利要求1所述的热转印色带，其特征在于，所述释放层所用的水性树脂乳液选自水性EVA树脂乳液、水性EEA树脂乳液或水性丙烯酸树脂乳液。
6.根据权利要求1所述的热转印色带，其特征在于，所述粘附层所用的水性树脂乳液选自水性氯乙烯共聚物乳液或水性聚酯乳液。
7.根据权利要求1所述的热转印色带，其特征在于，所述无机颜料为炭黑。
8.根据权利要求1所述的热转印色带，其特征在于，所述承载基材为聚酯薄膜，厚度为3-10μm。
9.一种权利要求1所述水性树脂基热转印色带的制备方法，其特征在于，包括以下步骤：
a、将水性蜡乳液、水性树脂乳液、表面活性剂和去离子水分散均匀，用去离子水调节黏度和固含量，制成释放层乳液；
b、将释放层乳液涂布在带有耐热爽滑背涂层的承载基材上；
c、将水性树脂乳液、水性蜡乳液、无机颜料、分散剂、表面活性剂和去离子水分散均匀，研磨，用去离子水调节粘度和固含量，制成粘附层乳液；
d、将粘附层乳液涂布于已涂好释放层的承载基材上，制得水性树脂基热转印色带。
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