CN114834171A - 聚乙烯包材的环保印刷工艺 - Google Patents
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Abstract
本发明涉及一种聚乙烯包材的环保印刷工艺,制备三层共挤聚乙烯复合膜,其中电晕层共混熔融有纳米壳聚糖粉末;往耐蒸煮水性聚氨酯油墨中加入硅烷偶联剂和三乙烯二胺,调节pH值;电晕后在电晕层表印,然后95~100℃烘干、收卷。本发明在三乙烯二胺催化和烘干温度条件下电晕层表面的壳聚糖中的羟基使环氧基开环反应,在三乙烯二胺催化和碱性pH9左右条件下环氧基与壳聚糖中的氨基偶联形成共价键,同时结合电晕层表面的电晕处理使得耐蒸煮水性聚氨酯油墨与聚乙烯结合牢固以及KH‑560更易与壳聚糖的羟基和氨基以及电晕层反应结合,三者协同增强油墨的附着牢度的同时保证壳聚糖耐水解和抗菌持久效力。
Description
技术领域
本发明涉及聚乙烯包材技术领域,具体涉及一种聚乙烯包材的环保印刷工艺。
背景技术
食品安全与食品包装安全密不可分,包材在对食品提供保护、防止食品受外界微生物或其它物质的污染、防止或减少食品氧化和其它反应方面有着不可替代的作用,是食品保藏的重要手段。聚乙烯包材是一类应用广泛的食品级包材。
由于要对所包装的物体进行识别,这就需要对聚乙烯薄膜进行印刷,在聚乙烯薄膜表面印刷上各种信息以供人们获取。水性油墨简称水墨,是由连结料、色料、水和助剂经复合研磨加工而成的,因具有VOC含量低、不易燃、无毒和无异味等特点而成为唯一经美国食品药品协会认可的环保型油墨。水性油墨主要用于凹版印刷和柔性版印刷,产品多为包装用塑料薄膜等,主要用于食品包装、烟酒包装、儿童玩具包装等领域,因此对油墨的安全性、耐水性和粘附性的要求很高。
另外,为赋予聚乙烯薄膜表层抗菌性能,如中国公开专利文献(CN109517245A)公开了一种可降解复合包装膜,其原料由以下重量份的组分组成:低密度聚乙烯45~55份、聚乳酸20~35份、乙烯-乙烯醇共聚物15~20份、马铃薯淀粉10~20份、壳聚糖8~15份等。本发明通过优选原材料,并合理配比,制得的可降解复合包装膜,废弃于自然界后,发生光和生物双降解,可快速降解,通过壳聚糖带有的抗菌活性赋予薄膜一定的抗菌性能。但是,发挥抗菌活力主要是薄膜表面的壳聚糖,壳聚糖易水解而失去抗菌效力,且也容易导致表印的油墨脱落。
发明内容
本发明目的在于提供一种聚乙烯包材的环保印刷工艺,具有良好持久的抗菌效力且油墨附着力强。
为实现上述发明目的,本发明采用的技术方案是:
聚乙烯包材的环保印刷工艺,包括如下步骤:
S1、制备三层共挤聚乙烯复合膜,其中电晕层共混熔融有纳米壳聚糖粉末;
S2、往耐蒸煮水性聚氨酯油墨中加入3g/L~8g/L硅烷偶联剂KH-560和1g/L~2g/L三乙烯二胺,调节pH值至8.7-9.0,搅拌均匀;
S3、将步骤S1的三层共挤聚乙烯复合膜装在凹版印刷机的放卷轴上,将步骤S2的油墨送入凹版印刷机的墨槽内,电晕后用刮墨刀刮掉除版印滚筒上凹部的其他部分的油墨,通过压印滚筒将凹部的油墨转印到电晕层上,再印刷一层保护光油,然后95℃~100℃烘干、收卷。
优选地,所述步骤S2还包括加入稀释剂进行稀释至25℃粘度为18±2mPa·s。
优选地,所述稀释剂为乙酸正丙酯和/或乙酸正丁酯。
优选地,所述步骤S1的电晕层的电晕值为45-52达因。
优选地,所述步骤S3的压印滚筒的压力为3Pa~5Pa。
优选地,所述步骤S3的烘干速度为100m/min~200m/min,烘干时间300s~400s。
优选地,所述步骤S3的版印滚筒的网线为80~110线,针角为130~150度,网点深度为35μm~45μm,铬层硬度800HV~900HV。
优选地,所述电晕层包括20-30份熔融指数为0.24g/10min~0.28g/10min、密度为0.9225g/cm3~0.9230g/cm3的LDPE,30-40份熔融指数为0.45g/10min~0.55g/10min、密度为0.9162g/cm3~0.9168g/cm3的m-LLDPE,10-20份熔融指数0.98g/10min~1.12g/10min、密度为0.919g/cm3~0.921g/cm3的8碳m-LLDPE、1-3份PPA助剂以及8-15份纳米壳聚糖粉末。
与现有技术相比,本发明具有以下有益效果:
本发明在电晕层原料中加入壳聚糖赋予复合膜良好的初始抗菌性能,在油墨中加入硅烷偶联剂搅拌耐蒸煮水性聚氨酯油墨和三乙烯二胺实现油墨均匀分散,在三乙烯二胺催化和烘干温度条件下电晕层表面的壳聚糖中的羟基使KH-560的环氧基开环反应,在三乙烯二胺催化和碱性pH9左右条件下KH-560的环氧基与壳聚糖中的氨基偶联形成共价键,同时结合电晕层表面的电晕处理使得耐蒸煮水性聚氨酯油墨与聚乙烯结合牢固以及KH-560更易与壳聚糖的羟基和氨基以及电晕层反应结合,三者协同增强油墨的附着牢度的同时保证壳聚糖耐水解和抗菌持久效力,再者采用耐蒸煮水性聚氨酯油墨制得的复合膜图案良好的耐高温性和耐水性。
具体实施方式
实施例1
本实施例提供一种聚乙烯包材的环保印刷工艺,包括如下步骤:
S1、制备三层共挤聚乙烯复合膜:热封层原料包括35份熔融指数为1.0g/10min、密度为0.915g/cm3的m-LLDPE,15份熔融指数为0.252g/10min、密度为0.9225g/cm3的LDPE,抗静电剂0.3份、爽滑剂0.3份、开口剂1份以及1.5份PPA助剂。中层原料包括20份熔融指数为0.81g/10min、密度为0.912g/cm3的m-LLDPE,15份熔融指数为0.23g/10min、密度为0.922g/cm3的LDPE,35份熔融指数1.02g/10min、密度为0.908g/cm3的4碳LLDPE、1份爽滑剂以及2份PPA助剂。电晕层包括30份熔融指数为0.24g/10min、密度为0.9230g/cm3的LDPE,30份熔融指数为0.55g/10min、密度为0.9168g/cm3的m-LLDPE,15份熔融指数0.98g/10min、密度为0.92g/cm3的8碳m-LLDPE、1份PPA助剂以及10份纳米壳聚糖粉末。
S2、往中之星耐蒸煮PE环保凹印油墨中加入5g/L硅烷偶联剂KH-560和1g/L三乙烯二胺,调节pH值至8.8,搅拌均匀,加入乙酸正丙酯进行稀释至25℃粘度为18mPa·s。
S3、将步骤S1的三层共挤聚乙烯复合膜装在凹版印刷机的放卷轴上,将步骤S2的油墨送入凹版印刷机的墨槽内,电晕至46达因后用刮墨刀刮掉除版印滚筒上凹部的其他部分的油墨,版印滚筒的网线为80线,针角为130度,网点深度为35μm,铬层硬度900HV;通过压印滚筒将凹部的油墨转印到电晕层上,压印滚筒的压力为5Pa,再印刷一层保护光油,然后100℃烘干、收卷,烘干速度为180m/min,烘干时间320s。
实施例2
本实施例提供一种聚乙烯包材的环保印刷工艺,包括如下步骤:
S1、制备三层共挤聚乙烯复合膜:热封层原料包括30份熔融指数为1.05g/10min、密度为0.91g/cm3的m-LLDPE,25份熔融指数为0.25g/10min、密度为0.923g/cm3的LDPE,抗静电剂0.5份、爽滑剂0.5份、开口剂1.5份以及3份PPA助剂。中层原料包括25份熔融指数为0.82g/10min、密度为0.915g/cm3的m-LLDPE,10份熔融指数为0.25g/10min、密度为0.923g/cm3的LDPE,40份熔融指数1.03g/10min、密度为0.905g/cm3的4碳LLDPE、2份爽滑剂以及3份PPA助剂。电晕层包括20份熔融指数为0.28g/10min、密度为0.9228g/cm3的LDPE,40份熔融指数为0.45g/10min、密度为0.9162g/cm3的m-LLDPE,10份熔融指数1.12g/10min、密度为0.919g/cm3的8碳m-LLDPE、2份PPA助剂以及8份纳米壳聚糖粉末。
S2、往旭川化学XCU-8035A-5中加入3g/L硅烷偶联剂KH-560和1.5g/L三乙烯二胺,调节pH值至9.0,搅拌均匀,加入乙酸正丁酯进行稀释至25℃粘度为18mPa·s。
S3、将步骤S1的三层共挤聚乙烯复合膜装在凹版印刷机的放卷轴上,将步骤S2的油墨送入凹版印刷机的墨槽内,电晕至45达因后用刮墨刀刮掉除版印滚筒上凹部的其他部分的油墨,版印滚筒的网线为100线,针角为140度,网点深度为40μm,铬层硬度800HV;通过压印滚筒将凹部的油墨转印到电晕层上,压印滚筒的压力为3Pa,再印刷一层保护光油,然后95℃烘干、收卷,烘干速度为130m/min,烘干时间400s。
实施例3
本实施例提供一种聚乙烯包材的环保印刷工艺,包括如下步骤:
S1、制备三层共挤聚乙烯复合膜:热封层原料包括40份熔融指数为1.0g/10min、密度为0.918g/cm3的m-LLDPE,20份熔融指数为0.25g/10min、密度为0.9225g/cm3的LDPE,抗静电剂0.3份、爽滑剂0.2份、开口剂1份以及2份PPA助剂。中层原料包括20份熔融指数为0.8g/10min、密度为0.913g/cm3的m-LLDPE,20份熔融指数为0.25g/10min、密度为0.9225g/cm3的LDPE,30份熔融指数1.05g/10min、密度为0.910g/cm3的4碳LLDPE、1份爽滑剂以及1份PPA助剂。电晕层包括25份熔融指数为0.25g/10min、密度为0.9225g/cm3的LDPE,35份熔融指数为0.5g/10min、密度为0.9165g/cm3的m-LLDPE,20份熔融指数1g/10min、密度为0.920g/cm3的8碳m-LLDPE、3份PPA助剂以及15份纳米壳聚糖粉末。
S2、往旭川化学XCU-8035A-5中加入8g/L硅烷偶联剂KH-560和2g/L三乙烯二胺,调节pH值至9.0,搅拌均匀,加入乙酸正丙酯进行稀释至25℃粘度为20mPa·s。
S3、将步骤S1的三层共挤聚乙烯复合膜装在凹版印刷机的放卷轴上,将步骤S2的油墨送入凹版印刷机的墨槽内,电晕至48达因后用刮墨刀刮掉除版印滚筒上凹部的其他部分的油墨,版印滚筒的网线为110线,针角为150度,网点深度为45μm,铬层硬度900HV;通过压印滚筒将凹部的油墨转印到电晕层上,压印滚筒的压力为5Pa,再印刷一层保护光油,然后98℃烘干、收卷,烘干速度为150m/min,烘干时间360s。
对比例1
该对比例1与实施例3的区别仅在于:烘干温度为60℃。
对比例2
该对比例2与实施例3的区别仅在于:印刷前未电晕。
对比例3
该对比例3与实施例3的区别仅在于:油墨中不加三乙烯二胺和KH-560。
分别取上述实施例1-3(以下简称L1-L3)和对比例1-3(以下简称D1-D3)制得的聚乙烯包材做电晕层表面抗菌下降率、总迁移量、脱色试验以及油墨附着牢度变化情况,实验结果参见表1。
其中:电晕层表面抗菌性能参照QB/T 2591-2003附录A(分别测初始值A和浸水50℃/6h后抗菌值B,下降率X=(A-B)/A*100%),油墨附着牢度参照GB/T 13217.7-1991(○:残留90%以上,△:残留50-90%),脱色试验在100℃/2h高温处理后参照GB 31604.7-2016。
另,根据GB 31604.1-2015检测包材总迁移量,迁移实验条件为100℃/2h和121℃/1h,方法检出限为20,均未检出。
以上显示和描述了本发明创造的基本原理和主要特征及本发明的优点,本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明创造精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内,本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (8)
1.聚乙烯包材的环保印刷工艺,其特征在于,包括如下步骤:
S1、制备三层共挤聚乙烯复合膜,其中电晕层共混熔融有纳米壳聚糖粉末;
S2、往耐蒸煮水性聚氨酯油墨中加入3g/L~8g/L硅烷偶联剂KH-560和1g/L~2g/L三乙烯二胺,调节pH值至8.7-9.0,搅拌均匀;
S3、将步骤S1的三层共挤聚乙烯复合膜装在凹版印刷机的放卷轴上,将步骤S2的油墨送入凹版印刷机的墨槽内,电晕后用刮墨刀刮掉除版印滚筒上凹部的其他部分的油墨,通过压印滚筒将凹部的油墨转印到电晕层上,再印刷一层保护光油,然后95℃~100℃烘干、收卷。
2.根据权利要求1所述的聚乙烯包材的环保印刷工艺,其特征在于:所述步骤S2还包括加入稀释剂进行稀释至25℃粘度为18±2mPa·s。
3.根据权利要求2所述的聚乙烯包材的环保印刷工艺,其特征在于:所述稀释剂为乙酸正丙酯和/或乙酸正丁酯。
4.根据权利要求1所述的聚乙烯包材的环保印刷工艺,其特征在于:所述步骤S2的电晕层的电晕值为45-52达因。
5.根据权利要求1所述的聚乙烯包材的环保印刷工艺,其特征在于:所述步骤S3的压印滚筒的压力为3Pa~5Pa。
6.根据权利要求1所述的聚乙烯包材的环保印刷工艺,其特征在于:所述步骤S3的烘干速度为100m/min~200m/min,烘干时间300s~400s。
7.根据权利要求1所述的聚乙烯包材的环保印刷工艺,其特征在于:所述步骤S3的版印滚筒的网线为80~110线,针角为130~150度,网点深度为35μm~45μm,铬层硬度800HV~900HV。
8.根据权利要求1所述的聚乙烯包材的环保印刷工艺,其特征在于:所述步骤S1的电晕层包括20-30份熔融指数为0.24g/10min~0.28g/10min、密度为0.9225g/cm3~0.9230g/cm3的LDPE,30-40份熔融指数为0.45g/10min~0.55g/10min、密度为0.9162g/cm3~0.9168g/cm3的m-LLDPE,10-20份熔融指数0.98g/10min~1.12g/10min、密度为0.919g/cm3~0.921g/cm3的8碳m-LLDPE、1-3份PPA助剂以及8-15份纳米壳聚糖粉末。
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