CN106978130B - 一种标签标识用uv压敏胶 - Google Patents
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Abstract
本发明公开了一种标签标识用UV压敏胶及其制备方法,所述压敏胶由环氧改性丙烯酸酯预聚物、聚氨酯改性丙烯酸酯预聚物、丙烯酸酯单体、光引发剂、流变剂组成;其中环氧改性丙烯酸酯预聚物占8‑10%重量比;聚氨酯改性丙烯酸酯预聚物占50‑60%重量比;丙烯酸酯单体占25‑35%重量比;光引发剂占1‑4%重量比;增粘树脂占1‑2%重量比;流变剂占0.2‑0.5%重量比。本发明的标签标识用UV压敏胶具有固化速度快、初粘力大、90°和180°剥离力强、剥离后无残胶及工艺适应性宽的优点。
Description
技术领域
本发明涉及压敏胶技术领域,涉及一种利用两种丙烯酸酯预聚物复配制得一种可紫外光固化用于标签标识行业的压敏胶水,尤其是涉及到一种用环氧丙烯酸酯改性聚氨酯丙烯酸酯的可自由基聚合的压敏胶,具体涉及一种标签标识用UV压敏胶。
技术背景
随着工业技术的进步和标签行业的日益精细化,传统的压敏胶已在某些应用场合达不到要求,如像对待普通油墨一样使用普通的印刷设备上胶,在局部进行印刷,在剪切力和剥离力之中均有一个较理想的值,低表面能表面的粘结等,这些对传统压敏胶都构成了挑战。
UV压敏胶可以克服传统压敏胶一些固有的缺点,但是目前市场上UV压敏胶还存在内聚强度不够、初粘力弱、剥离力弱等问题,本发明就是顺应目前市场上存在的UV压敏胶存在的问题而研发出的一种高初粘和高剥离力的UV压敏胶产品。
发明内容
针对上述技术中存在的不足之处,本发明提供一种高初粘、高剥离力、固化速度快及工艺适应性宽的标签标识用UV压敏胶。
为实现上述目的,本发明提供一种标签标识用UV压敏胶,由环氧改性丙烯酸酯预聚物、聚氨酯改性丙烯酸酯预聚物、丙烯酸酯单体、光引发剂、流变剂组成;其中环氧改性丙烯酸酯预聚物占8-10%重量;聚氨酯改性丙烯酸酯预聚物占50-60%重量;丙烯酸酯单体占25-35%重量;光引发剂占1-4%重量;增粘树脂占1-2%重量;流变剂占0.2-0.5%重量。
其中,所述环氧改性丙烯酸酯预聚物由75-80%重量双酚A环氧树脂E51、8-10%重量丙烯酸、0.2-0.3%重量三乙胺及12-15%重量双羟基聚醚聚合而成。
其中,所述聚氨酯改性丙烯酸酯预聚物由60-63%重量双羟基聚醚、20-22%重量六亚甲基二异氰酸酯、15-18%重量丙烯酸羟乙酯及0.2-0.3%重量二月桂酸二丁基锡聚合而成。
其中,所述丙烯酸酯单体为丙烯酸丁酯、丙烯酸异辛酯、丙烯酸异癸酯、丙烯酸月桂酯中的一种或两种以上混合物。
其中,所述光引发剂为自由基裂解型引发剂:苯偶姻及其衍生物、苯偶酰缩酮衍生物、酰基膦氧化物及α-羟烷基苯酮中的一种或两种以上混合物。
其中,所述增粘树脂为松香树脂。
其中,所述流变剂为气相二氧化硅R974、气相二氧化硅R972及气相二氧化硅A200的一种或两个以上混合物。
其中,所述环氧改性丙烯酸酯占8%重量;所述聚氨酯改性丙烯酸酯占58%重量;所述丙烯酸酯单体为丙烯酸十二烷基酯占28%重量;所述光引发剂为1-羟基环己基苯基甲酮占4%重量;所述增粘树脂为松香树脂占1.5%重量;所述流变剂为气相二氧化硅R974占0.5重量比。
本发明的有益效果是:区别于现有技术的情况,本发明的UV压敏胶具有高初粘、高剥离力、无溶剂环保及工艺适应性宽的优点。
本发明的压敏胶已经取得了有益技术效果,解决了本发明声称的技术问题,本发明在上述发明的基础上为了进一步的提高压敏胶的固化速度,在上述发明的基础上,进一步添加压敏胶加速固化剂,所述的加速固化剂是由聚硫醇与乙二胺混合而成,所述聚硫醇与乙二胺的重量比为3:1,所述的加速固化剂的添加量是环氧改性丙烯酸酯预聚物和聚氨酯改性丙烯酸酯预聚物总量的0.3-1.7%。
具体的本发明还提供一种标签标识用UV压敏胶,由环氧改性丙烯酸酯预聚物、聚氨酯改性丙烯酸酯预聚物、丙烯酸酯单体、光引发剂、流变剂组成;其中环氧改性丙烯酸酯预聚物占8-10%重量;聚氨酯改性丙烯酸酯预聚物占50-60%重量;丙烯酸酯单体占25-35%重量;光引发剂占1-4%重量;增粘树脂占1-2%重量;流变剂占0.2-0.5%重量;进一步添加压敏胶加速固化剂,所述的加速固化剂是由聚硫醇与乙二胺混合而成,所述聚硫醇与乙二胺的重量比为3:1,所述的加速固化剂的添加量是环氧改性丙烯酸酯预聚物和聚氨酯改性丙烯酸酯预聚物总量的0.3-1.7%。
本发明进一步的有益效果是:区别于现有技术的情况,本发明的UV压敏胶还具有固化速度快的优点。
具体实施方法
为了使本发明的目的和技术方案更加清楚明白,以下结合具体实施例,对本发明进一步详细说明。
本发明涉及到一种采用自制环氧改性丙烯酸酯和聚氨酯改性丙烯酸酯共混改性的压敏胶的制备,其具体制备方法:
1、环氧改性丙烯酸酯预聚物的制备:
将12份双羟基聚醚、78份环氧树脂、0.3份三乙胺加入到四口烧瓶中,升温至110℃反应3h,然后滴加8份丙烯酸,115℃保温反应3h。
2、聚氨酯改性丙烯酸预聚物的制备
将一定20份六亚甲基二异氰酸酯和0.3份二月桂酸二丁基锡加入到四口烧瓶中,通氮气保护,滴加60份双羟基聚醚,温度控制在60℃,保温2h,将温度升至80℃,滴加20份丙烯酸羟乙酯,保温7h。
实施例1由以下组份按重量配比得到
将上述组份搅拌均匀,并脱泡,以20微米厚度涂布于PET膜上,然后过1000W紫外光光固化机5-10s。
实施例2由以下组份按重量配比得到
将上述组份搅拌均匀,并脱泡,以20微米厚度涂布于PET膜上,然后过1000W紫外光光固化机5-10s。
实施例3由以下组份按重量配比得到
将上述组份搅拌均匀,并脱泡,以20微米厚度涂布于PET膜上,然后过1000W紫外光光固化机5-10s。
实施例4由以下组份按重量配比得到
将上述组份搅拌均匀,并脱泡,以20微米厚度涂布于PET膜上,然后过1000W紫外光光固化机5-10s。
在具体的实践中,将三个实施方案得到的UV压敏胶性能进行测试对比:
1剥离强度:按美国粘性胶带协会标准PSTC-1 180度剥离粘着力测试方法。
2环形初粘力:按:“不干标签及相关产品全球协会”的FINAT FTM9的测试方法。
3持粘力:按美国粘性胶带协会标准PSTC-7保持力测试方法。
以上对比测试结果可以看出,通过环氧丙烯酸酯改性聚氨酯丙烯酸酯所得UV压敏胶在初粘力、180°剥离力及持粘力能得到一个更好的平衡,各方面性能均非常优异。同时环氧丙烯酸酯和聚氨酯丙烯酸酯的比例须在一个合适的范围,环氧丙烯酸酯过多对初粘影响非常大,而聚氨酯丙烯酸酯对持粘影响较大。
在上述实施例1-4中的压敏胶的制备过程中,具体是在各组份搅拌均匀前进一步添加3:1的聚硫醇与乙二胺,所述的加速固化剂的添加量是环氧改性丙烯酸酯预聚物和聚氨酯改性丙烯酸酯预聚物总量的0.7%。然后脱泡,以20微米厚度涂布于PET膜上,然后过1000W紫外光光固化机8s。
然后对比使用上述加速固化剂与现有技术中普通的UV压敏胶(特选择不使用加速固化剂的UV压敏胶)的固化快慢情况,二者均是用于两块相同大小的胶接试样板,35秒之后将胶接试样板以规定的速率从胶接的开口处剥开,两块被粘物沿着被粘面长度的方向逐渐分离。通过挠性被粘物所施加的剥离力基本上平行于胶接面,通过90°剥离力来评价在35秒之内两种胶的固化速度,对比发现,使用加速固化剂的胶接试样板剥离力均值为21.7N/25mm,而未使用本发明的加速固化剂的上述现有技术中普通的UV压敏胶的90°剥离力均值为13.4N/25mm。
以上公开的仅为本发明的几个具体实例,但是本发明并非局限与此,任何本领域的技术人员能思之的变化都应落入本发明的保护范围。
Claims (6)
1.一种标签标识用UV压敏胶,所述压敏胶由环氧改性丙烯酸酯预聚物、聚氨酯改性丙烯酸酯预聚物、丙烯酸酯单体、光引发剂、增粘树脂、流变剂组成;其中环氧改性丙烯酸酯预聚物占8-10%重量;聚氨酯改性丙烯酸酯预聚物占50-60%重量;丙烯酸酯单体占25-35%重量;光引发剂占1-4%重量;增粘树脂占1-2%重量;流变剂占0.2-0.5%重量;
其中,所述环氧改性丙烯酸酯预聚物由75-78%重量双酚A环氧树脂E51、8-10%重量丙烯酸、0.2-0.3%重量三乙胺及12-15%重量双羟基聚醚聚合而成。
2.根据权利要求1所述的UV压敏胶,其特征在于所述聚氨酯改性丙烯酸酯预聚物由60-63%重量双羟基聚醚、20-22%重量六亚甲基二异氰酸酯、15-18%重量丙烯酸羟乙酯及0.2-0.3%重量二月桂酸二丁基锡聚合而成。
3.根据权利要求1所述的UV压敏胶,其特征在于所述丙烯酸酯单体为丙烯酸丁酯、丙烯酸异辛酯、丙烯酸异癸酯、丙烯酸月桂酯中的一种或两种以上混合物。
4.根据权利要求1所述的UV压敏胶,其特征在于所述光引发剂为自由基裂解型引发剂:苯偶姻及其衍生物、苯偶酰缩酮衍生物、酰基膦氧化物及α-羟烷基苯酮中的一种或两种以上混合物。
5.根据权利要求1所述的UV压敏胶,其特征在于所述增粘树脂为松香树脂。
6.根据权利要求1所述的UV压敏胶,其特征在于所述流变剂为气相二氧化硅R974、气相二氧化硅R972及气相二氧化硅A200的一种或两个以上混合物。
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