CN107760107A - 一种水性光学变色油墨及其制备方法 - Google Patents
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Abstract
本发明提供了一种水性光学变色油墨及其制备方法，按照重量百分比由以下原料组分组成：水性丙烯酸成膜分散体30％‑40％，水性聚氨酯分散体30％‑40％，润湿分散剂1％‑5％，流平剂0.5％‑2％、消泡剂0.1％‑1％、防冻剂1％‑3％，增稠剂1％‑3％，光变粉10％‑20％，蜡粉1％‑2％，水5‑12％，以上各组分的质量百分比总和为100％。本发明以水作为稀释剂，彻底改变有机物在印刷品中的残留问题，同时达到了油墨在干燥无污染，挥发性有机物零排放的目的。水性分散体改善印刷过程堵网现象和提高油墨的复溶性。专用光学变色颜料在水性体系中光变特性弱，色差变化大。
Description
技术领域
本发明涉及油墨领域，具体是一种水性光学变色油墨及其制备方法。
背景技术
随着市场经济的发展，越来越多的名牌产品提出了防伪技术应用的需求，现有的范围印刷油墨应用范围窄，价格较高，与承印物基材之间的附着力差，光变特性弱，色差变化小。另外在现有的光学变色油墨中，都含有或多或少的挥发性有机化合物，尤其在丝网印刷、凸版印刷、凹版印刷、平板印刷中所使用的油墨都含有挥发性有机化合物。由于在易挥发性的有机化合物中，一般都会含有许多对人体、对环境有害的物质成分，这些有害的物质成分可能会通过包装物渗透到食品、药品等直接与人体接触的中物体上，因此含有挥发性的有机化合物的油墨，因此，世界卫生组织及中国政府，在用于食品类、药品等包装物在印刷品中挥发性有机化合物的含量受到了严格的限定。在现有技术中也有一些挥发性有机化合物含量较低的水性油墨、水性光学变色油墨，例如中国专利00104371.4；02158999.2；95120946.9；97198466.2；93110632.X；200510019369.8中公开了相关的技术方案，上述专利文献中所公开的技术方案，只适用于打印机专用油墨，或适用于书写笔芯的专用油墨，或是一些简单包装品的印刷。而目前在印刷行业中大批量使用的丝网印刷、凸版印刷、凹版印刷、平板印刷专用油墨中还含有较多的易挥发性有机化合物，且不易达到防伪的效果。因此，有必要对现有的含有易挥发性有机化合物的光学变色油墨的配方及生产工艺进行改进。
发明内容
针对上述现有技术的不足，本发明提供一种水性光学变色油墨及其制备方法，可彻底改变有机物在印刷品中的残留问题，同时达到了油墨在干燥过程中无污染。
一种水性光学变色油墨，按照重量百分比由以下原料组分组成：水性丙烯酸成膜分散体30％-40％，水性聚氨酯分散体30％-40％，润湿分散剂1％-5％，流平剂0.5％-2％、消泡剂0.1％-1％、防冻剂1％-3％，增稠剂1％-3％，光变粉10％-20％，蜡粉1％-2％，水5-12％，以上各组分的重量百分比总和为100％。
进一步的，所述水性光学变色油墨按照重量百分比由以下原料组分组成：水性丙烯酸成膜分散体35％，水性聚氨酯分散体35％，润湿分散剂1％，流平剂0.5％、消泡剂0.2％、防冻剂2％，增稠剂3％，光变粉10％，蜡粉2％，水11.3％。
进一步的，所述水性丙烯酸成膜分散体的TG值(玻璃化转变温度)为20-50℃，所述水性聚氨酯分散体的模量为20-60Mpa。
一种水性光学变色油墨的制备方法，包括如下步骤：
(1)按照原料组分重量配比，在常温、常压下将水性丙烯酸成膜分散体、水性聚氨酯分散体制成混合液；用200目滤布预先过滤好后再用；
(2)将步骤(1)所得的混合液在分散机中进行分散，在分散过程中添加水、润湿分散剂、流平剂、消泡剂、防冻剂和增稠剂，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在30分钟；
(3)用分散机分散在步骤(2)中得到的混合液，且在分散过程中添加光变粉、蜡粉，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在45分钟。
本发明中润湿分散剂、流平剂、消泡剂、防冻剂，增稠剂，光变粉及蜡粉等原料均通过购买得到。所述水性丙烯酸成膜分散体和水性聚氨酯分散体为实验室制备得到。
所述水性丙烯酸成膜分散体的制备方法为：原料组成：88份甲基丙烯酸甲酯、12份甲基丙烯酸、16份丙烯酸羟丙酯、1.8份过氧化苯甲酸叔丁酯、N，N二甲基乙醇胺12份、异丙醇45份、蒸馏水100份。
制作方法：(1)将甲基丙烯酸甲酯、甲基丙烯酸、丙烯酸羟丙酯、1份过氧化苯甲酸叔丁酯混合均匀得到单体引发剂混合物，取1/5的单体引发剂混合物加入异丙醇中，搅拌升温至65℃；将剩余的4/5单体引发剂混合物缓慢加入反应器内，加完后继续保温反应，然后再补加剩余的0.8份过氧化苯甲酸叔丁酯，保温反应，得到热固型丙烯酸树脂溶液；(2)将步骤(1)制备的热固型丙烯酸树脂溶液升温至74℃，高速搅拌下加入N,N-二甲基乙醇胺和蒸馏水转相成水性丙烯酸分散体，即得固体含量为42％的水性丙烯酸成膜分散体。
水性聚氨酯分散体的制备方法：在惰性气体保护下，搅拌下将苯二亚甲基二异氰酸酯加入到羟基丁苯橡胶中，反应1.5h，升温至80℃，加入1,4-丁二醇-2-磺酸钠和1,4-环己烷二甲醇，反应3.6h，降温至45℃，加入二甲基乙醇胺进行中和反应，反应1h，加入去离子水，转速600转/分钟下剪切分散，加入乙二胺进行扩链反应，反应2.5h，得到水性聚氨酯分散体。
本发明的有益效果：本发明水性光学变色油墨是以水作为稀释剂，因此，该水溶性光学变色油墨可彻底改变有机物在印刷品中的残留问题，同时达到了油墨在干燥过程中无污染，挥发性有机化合物零排放的目的，还可减少挥发性有机化合物对操作人员的危害，采用水性分散体改善印刷过程堵网现象并且提高了油墨的复溶性；另外该水性光学变色油墨还具有应用范围宽，价格较低，与承印物基材之间的附着力强，光变特性弱，色差变化大，适应各种材料上印刷的特点。该水溶性光学变色油墨的生产工艺与微缩胶囊油墨相比，其印刷出来产品的耐光性提高10倍。
具体实施方式
下面结合具体实施例对本发明做进一步的说明。
以下实施例中，所述消泡剂选自德国迪高公司的tego901W和/或tego810，所述催化剂为N，N二甲基乙醇胺。所述成膜剂为醇酯-12。所述流平剂为BYK-333，BYK-333为聚醚改性有机硅，安全环保，对环境无污染，可增进底材润湿性，表面滑爽性和光泽。
所述增稠剂选自疏水改性聚氨酯(RM-8W)和/或非离子型聚氨酯(105A)。
以下实施例中，所述水性丙烯酸成膜分散体的制备方法为：原料组成：88份甲基丙烯酸甲酯、12份甲基丙烯酸、16份丙烯酸羟丙酯、1.8份过氧化苯甲酸叔丁酯、N，N二甲基乙醇胺12份、异丙醇45份、蒸馏水100份。
制作方法：(1)将甲基丙烯酸甲酯、甲基丙烯酸、丙烯酸羟丙酯、1份过氧化苯甲酸叔丁酯混合均匀得到单体引发剂混合物，取1/5的单体引发剂混合物加入异丙醇中，搅拌升温至65℃；将剩余的4/5单体引发剂混合物缓慢加入反应器内，加完后继续保温反应，然后再补加剩余的0.8份过氧化苯甲酸叔丁酯，保温反应，得到热固型丙烯酸树脂溶液；(2)将步骤(1)制备的热固型丙烯酸树脂溶液升温至74℃，高速搅拌下加入N,N-二甲基乙醇胺和蒸馏水转相成水性丙烯酸分散体，即得固体含量为42％的水性丙烯酸成膜分散体。
以下实施例中，水性聚氨酯分散体的制备方法：在惰性气体保护下，搅拌下将苯二亚甲基二异氰酸酯加入到羟基丁苯橡胶中，反应1.5h，升温至80℃，加入1,4-丁二醇-2-磺酸钠和1,4-环己烷二甲醇，反应3.6h，降温至45℃，加入二甲基乙醇胺进行中和反应，反应1h，加入去离子水，转速600转/分钟下剪切分散，加入乙二胺进行扩链反应，反应2.5h，得到水性聚氨酯分散体。
实施例1
(1)在常温、常压下将重量比为35％的水性丙烯酸成膜分散体、35％的水性聚氨酯分散体制成混合液；用200目滤布预先过滤好后再用；
(2)将步骤(1)所得的混合液在分散机中进行分散，在分散过程中添加11.3％的水，1％的润湿分散剂，0.5％的流平剂，0.2％的消泡剂，2％的防冻剂，3％的增稠剂，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在30分钟；
(3)用分散机分散在步骤(2)中得到的混合液，且在分散过程中添加10％的光变粉、2％的蜡粉。所述分散机的转速控制在1000转/分钟。所述混合液在所述分散机中分散的时间应控制在45分钟。
实施例2
(1)在常温、常压下将重量比为30％的水性丙烯酸成膜分散体、40％的水性聚氨酯分散体制成混合液；用200目滤布预先过滤好后再用；
(2)将步骤(1)所得的混合液在分散机中进行分散，在分散过程中添加6.5％的水，2％的润湿分散剂，1％的流平剂，0.5％的消泡剂，2％的防冻剂，1.5％的增稠剂，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在30分钟；
(3)用分散机分散在步骤(2)中得到的混合液，且在分散过程中添加15％的光变粉、1.5％的蜡粉。所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在45分钟。
实施例3
(1)在常温、常压下将重量比为35％的水性丙烯酸成膜分散体、30％的水性聚氨酯分散体制成混合液；用200目滤布预先过滤好后再用；
(2)将步骤(1)所得的混合液在分散机中进行分散，在分散过程中添加5.3％的水，3％的润湿分散剂，2％的流平剂，0.7％的消泡剂，2％的防冻剂，1％的增稠剂，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在30分钟；
(3)用分散机分散在步骤(2)中得到的混合液，且在分散过程中添加20％的光变粉、1％的蜡粉。所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在45分钟。
以上所述仅为本发明的具体实施方案的详细描述，并不以此限制本发明，凡在本发明的设计思路上所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
Claims (6)
1.一种水性光学变色油墨，其特征在于：按照重量百分比由以下原料组分组成：水性丙烯酸成膜分散体30％-40％，水性聚氨酯分散体30％-40％，润湿分散剂1％-5％，流平剂0.5％-2％、消泡剂0.1％-1％、防冻剂1％-3％，增稠剂1％-3％，光变粉10％-20％，蜡粉1％-2％，水5-12％，以上各组分的重量百分比总和为100％。
2.根据权利要求1所述的水性光学变色油墨，其特征在于：按照重量百分比由以下原料组分组成：水性丙烯酸成膜分散体35％，水性聚氨酯分散体35％，润湿分散剂1％，流平剂0.5％、消泡剂0.2％、防冻剂2％，增稠剂3％，光变粉10％，蜡粉2％，水11.3％。
3.根据权利要求1所述的水性光学变色油墨，其特征在于：所述水性丙烯酸成膜分散体按照重量份数由以下原料配置而成：甲基丙烯酸甲酯88份、甲基丙烯酸12份、丙烯酸羟丙酯16份、过氧化苯甲酸叔丁酯1.8份、N，N二甲基乙醇胺12份、异丙醇45份、蒸馏水100份。
4.根据权利要求1所述的水性光学变色油墨，其特征在于：所述水性聚氨酯分散体的制备方法：在惰性气体保护下，搅拌下将苯二亚甲基二异氰酸酯加入到羟基丁苯橡胶中，反应1.5h，升温至80℃，加入1,4-丁二醇-2-磺酸钠和1,4-环己烷二甲醇，反应3.6h，降温至45℃，加入二甲基乙醇胺进行中和反应，反应1h，加入去离子水，转速600转/分钟下剪切分散，加入乙二胺进行扩链反应，反应2.5h，得到水性聚氨酯分散体。
5.根据权利要求1-4任一项所述的水性光学变色油墨，其特征在于：所述水性丙烯酸成膜分散体的TG值为20-50，所述水性聚氨酯分散体的模量为20-60Mpa。
6.根据权利要求1-4任一项所述的水性光学变色油墨的制备方法，其特征在于包括如下步骤：
(1)先制备水性丙烯酸成膜分散体和水性聚氨酯分散体，再按照水性光学变色油墨的原料组分重量配比，在常温、常压下将水性丙烯酸成膜分散体、水性聚氨酯分散体制成混合液；用200目滤布预先过滤好后再用；
(2)将步骤(1)所得的混合液在分散机中进行分散，在分散过程中添加水、润湿分散剂、流平剂、消泡剂、防冻剂和增稠剂，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在30分钟；
(3)用分散机分散在步骤(2)中得到的混合液，且在分散过程中添加光变粉、蜡粉，所述分散机的转速控制在1000转/分钟，所述混合液在所述分散机中分散的时间应控制在45分钟。
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