CN111961368B - 一种印刷pe薄膜的耐水耐油抗冻的凹版表印油墨 - Google Patents
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Abstract
本发明涉及一种印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，包括以下组分及含量：2‑氯甲基苯乙烯5‑8％，氯醚树脂4‑8％，磷酸酯化双淀粉3‑5％，四氢呋喃树脂2‑4％，色粉8‑15％，聚氨酯树脂15‑25％，丙烯酸树脂10‑20％，抗返粘剂1‑2％，附着力促进剂2‑3％，抗静电剂0.5％，分散剂1‑2％，固化剂2‑5％，溶剂余量。本发明通过添加组分及其含量的合理选择，在不改变凹版油墨本身的细度、流动性、透明度、遮盖力、色相等参数的前提下，使原本无法在PE基材上做到有效耐水、耐油的表印油墨，得以实现。本发明的油墨印刷在PE基材后，经过干燥，熟化后，在‑20℃环境中存放24小时，再用食用油浸泡30分钟，取出后，在沾有食用油的情况下反复揉搓100次，基材上的油墨无折痕且不掉色。
Description
技术领域
本发明属于涂料油墨技术领域，尤其涉及一种印刷PE薄膜的耐水耐油抗冻的凹版表印油墨。
背景技术
聚乙烯(PE)是结构最简单的高分子，人们常常提的方便袋就是聚乙烯，食品包装一般都是采用聚乙烯。聚乙烯无极性，化学性质稳定，几乎不溶于任何溶剂，比较难以印刷。市场上95％的食品包装特别是凹版印刷包装都是采用溶剂型油墨印刷。因此油墨生产制造者就必须生产相对应的聚乙烯薄膜专用油墨，来适应薄膜其本身性能，满足印刷厂的印刷要求。近年来，随着人民生活水平的不断提升，不仅带动了包装工业的飞速增长，也促进了塑料凹版油墨技术及市场的不断发展。对用于肉类，海鲜食材的包装袋，一般是在冷冻柜中，温度在-20℃左右，这需要油墨具有较好的抗冻性。包装肉类，海鲜食材等食品的包装袋在存放时，可能会沾染一部分食用油在包装袋上，因此需要油墨具有较好的耐油性。现有的包装袋一般为复合包装，但成本高，而选用表印包装，可极大的节约成本，但无法做到抗油，耐低温环境。因此研发一种适用于印刷包装肉类、海鲜食材等食品的PE薄膜的耐水耐油抗冻的凹版表印油墨是目前所有油墨工程技术人员共同探讨和面对的重大课题。
发明内容
本发明的目的在于提供一种印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，以解决现有技术存在的问题。
一种印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，包括以下组分及含量：2-氯甲基苯乙烯5-8％，氯醚树脂4-8％，磷酸酯化双淀粉3-5％，四氢呋喃树脂2-4％，色粉8-15％，聚氨酯树脂15-25％，丙烯酸树脂10-20％，抗返粘剂1-2％，附着力促进剂2-3％，抗静电剂0.5％，分散剂1-2％，固化剂2-5％，溶剂余量。
四氢呋喃树脂与固化剂反应可形成三维网状的热固性塑料，四氢呋喃树脂在固化反应过程中收缩率小，固化物的粘结性、耐热性、耐化学药品性以及力学性能和电气性能优良的特点。氯醚树脂可以提高油墨的溶剂释放性。磷酸酯化双淀粉防止低温过程中出现龟裂现象；增强抗冻能力，增加墨层柔软效果。2-氯甲基苯乙烯能与固化剂发生交联反应。
2-氯甲基苯乙烯的结构式如下：
优选的，所述溶剂包括乙酯15-25％、异丙醇10-30％、丁酯25-40％、正丙酯40-45％。
优选的，包括以下组分及含量：2-氯甲基苯乙烯6％，氯醚树脂5％，磷酸酯化双淀粉3％四氢呋喃树脂2％，色粉10％，聚氨酯树脂28％，丙烯酸树脂15％，抗返粘剂1％，附着力促进剂2％，抗静电剂0.5％，分散剂1％，固化剂3％，溶剂余量。
优选的，所述溶剂包括乙酯20％、异丙醇15％、丁酯25％、正丙酯40％。
优选的，所述固化剂为羟基反应型固化剂。
上述印刷PE薄膜的耐水耐油抗冻的凹版表印油墨的制备方法，主要包括以下步骤：
(1)依次加入2-氯甲基苯乙烯，氯醚树脂，磷酸酯化双淀粉，四氢呋喃树脂，色粉，丙烯酸树脂和溶剂，充分搅拌均匀；
(2)再依次加入抗返粘剂，附着力促进剂，抗静电剂，分散剂，再次搅拌均匀，将搅拌均匀后在研磨机中进行研磨；
(3)再加入聚氨酯树脂，溶剂，搅拌均匀后送检，检测合格后包装入库。
优选的，步骤(2)研磨后细度小于15微米。
由树脂和溶剂的混合液为载体，将色粉，添加剂通过有效的搅拌和研磨均匀的分散在溶剂与树脂的混合载体中成为油墨成品，印刷在承印物上之后，通过挥发干燥使溶剂成分完全挥发，干燥后的油墨粘附在承印物上。本发明工作原理为通过在以聚氨酯为主体树脂的油墨中添加2-5％的固化剂，以特定的双组分工艺，干燥、熟化后，使印刷品达到极佳的耐水、耐油效果。
与现有技术相比，本发明通过添加组分及其含量的合理选择，在不改变凹版油墨本身的细度、流动性、透明度、遮盖力、色相等参数的前提下，使原本无法在PE基材上做到有效耐水、耐油的表印油墨，得以实现。本发明通过2-氯甲基苯乙烯、氯醚树脂、四氢呋喃树脂、聚氨酯树脂、丙烯酸树脂与固化剂之间的相互协同作用，使本发明的油墨具有较好的耐油效果，墨印刷在PE基材后，经过干燥，熟化后，在-20摄氏度环境中存放24小时，再用食用油浸泡30分钟，取出后，在沾有食用油的情况下反复揉搓100次，基材上的油墨无折痕且不掉色。磷酸酯化双淀粉的加入不仅能防止低温过程中出现龟裂现象；增强抗冻能力，还能增加墨层柔软效果。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将对本发明作进一步地详细描述。
实施例1
一种印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，包括以下组分及含量：2-氯甲基苯乙烯6％，氯醚树脂5％，磷酸酯化双淀粉3％四氢呋喃树脂2％，色粉10％，聚氨酯树脂28％，丙烯酸树脂15％，抗返粘剂1％，附着力促进剂2％，抗静电剂0.5％，分散剂1％，羟基反应型固化剂3％，溶剂余量。溶剂包括乙酯20％、异丙醇15％、丁酯25％、正丙酯40％。
制备方法，主要包括以下步骤：
(1)依次加入2-氯甲基苯乙烯，氯醚树脂，磷酸酯化双淀粉，四氢呋喃树脂，色粉，丙烯酸树脂和溶剂，充分搅拌均匀；
(2)再依次加入抗返粘剂，附着力促进剂，抗静电剂，分散剂，再次搅拌均匀，将搅拌均匀后在研磨机中进行研磨，研磨后细度小于15微米；
(3)再加入聚氨酯树脂，溶剂，搅拌均匀后送检，检测合格后包装入库。
1、对实施例1的印刷PE薄膜的耐水耐油抗冻的凹版表印油墨进行耐水和耐油性测试，结果如下：
耐水：印刷品在2-5℃左右的自来水中完全浸没后取出，在印刷膜上还有水时反复揉搓50次，油墨不脱落。
耐油：印刷品在室温下的食用油中完全浸没后取出，在印刷膜上有食用油时反复揉搓50次，油墨不脱落。
本发明的油墨印刷在PE基材后，经过干燥，熟化后，在-20℃环境中存放24小时，再用食用油浸泡30分钟，取出后，在沾有食用油的情况下反复揉搓100次，基材上的油墨无折痕且不掉色。
2、对实施例1的印刷PE薄膜的耐水耐油抗冻的凹版表印油墨进行其它性能测试，结果如下：
细度：≤15um；
流动性：粘度在30-40之间，茶恩3号杯测试；
透明度：与常规油墨近似；
遮盖力：与常规油墨近似；
着色力：99
附着牢度/％：98
色相：与常规油墨近似，本体系颜色齐全。包含，白墨、原色黄、原色红、原色蓝、黑墨等。
稳定性测试：耐热100℃不胶化，冷冻-25℃不返粗没龟裂；放置半年没有出现分层、返粗、丢色现象。
对比例1
不含丙烯酸树脂，聚氨酯树脂的含量为43％。其它与实施例1相同。发现印刷时会造成反粘的现象，即印刷的油墨在收卷的时候粘住。而且固化效果不好，无法达到耐油的程度，做耐油测试时，可以揉搓掉。
对比例2
不含羟基反应型固化剂，其它与实施例1相似。未能达到耐油的效果，耐油实验过程中油墨脱落。
对比例3
不含2-氯甲基苯乙烯，其它与实施例1相似。耐油实验：印刷品在室温下的食用油中完全浸没后取出，在印刷膜上有食用油时反复揉搓50次后，油墨脱落。
对比例4
不含氯醚树脂，其它与实施例1相似。溶解释放性不好，印刷时收卷也会反粘。
对比例5
不含磷酸酯化双淀粉，其它与实施例1相似。冷冻-25℃有轻微返粗，而且会有龟裂现象。在-20℃环境中存放24小时，再用食用油浸泡30分钟，取出后，在沾有食用油的情况下反复揉搓不足10次。
对比例6
不含四氢呋喃树脂，其它与实施例1相似。耐热性能降低，耐热100℃出现胶化现象，耐热80℃不胶化。墨层起皱，不够柔软。
对比例7
将溶剂换成100％乙醇，挥发太快干，易吸水，造成膜层雾化不透明；油墨溶解不充分，油墨有增稠现象。
将溶剂换成100％丁酯，溶剂太慢干，造成溶剂残留大。
Claims (3)
1.一种印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，其特征在于，包括以下组分及含量：2-氯甲基苯乙烯6%，氯醚树脂 5%，磷酸酯化双淀粉3% 四氢呋喃树脂2%，色粉10%，聚氨酯树脂28%，丙烯酸树脂15%，抗返粘剂1%，附着力促进剂2%，抗静电剂0.5%，分散剂1%，固化剂3%，溶剂余量；所述固化剂为羟基反应型固化剂。
2.根据权利要求1所述印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，其特征在于，所述溶剂包括乙酯15-25%、异丙醇10-30%、丁酯25-40%、正丙酯40-45%。
3.根据权利要求2所述印刷PE薄膜的耐水耐油抗冻的凹版表印油墨，其特征在于，所述溶剂包括乙酯20%、异丙醇15%、丁酯25%、正丙酯40%。
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