CN111675993B - 一种瓶盖印刷新工艺 - Google Patents

一种瓶盖印刷新工艺 Download PDF

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CN111675993B
CN111675993B CN202010713212.XA CN202010713212A CN111675993B CN 111675993 B CN111675993 B CN 111675993B CN 202010713212 A CN202010713212 A CN 202010713212A CN 111675993 B CN111675993 B CN 111675993B
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车俊峥
车皓橦
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Foshan Tongjun Environmental Protection Technology Co ltd
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Abstract

本发明公开了一种瓶盖印刷新工艺,包括胶粘剂印刷步骤,具体为:通过凸印的方式,将表面附着胶粘剂压印于铁皮上,胶粘剂为单组份高温固化聚氨酯胶粘剂,其由聚氨酯预聚体与扩链剂复配而成,聚氨酯预聚体的合成材料包括聚醚多元醇、聚酯多元醇、二异氰酸酯、催化剂、有机溶剂以及封端剂,二异氰酸酯中的异氰酸酯基与聚醚多元醇、聚酯多元醇总的羟基的摩尔比为2:1~4:1,聚醚多元醇和聚酯多元醇的摩尔比为1:1~3:1。本发明采用凸版的印刷辊压印胶粘剂于铁片上,避免了传统的涂布胶粘剂于铁片上所带来的胶粘剂的浪费,而采用对应的胶粘剂,保证了其对于印刷辊凸位还是对于铁片来说均具有良好的吸附性能。

Description

一种瓶盖印刷新工艺
技术领域
本发明涉及铁瓶盖制造领域,特别涉及一种瓶盖印刷新工艺。
背景技术
现有的瓶盖生产工艺:首先在整张马口铁全版印好图案,再将粘合剂均匀地刷在整张铁皮上,然后将铁皮加热(150~180℃),在这个过程中,胶黏剂中的溶剂挥发,胶黏剂预固化;然后将该铁皮用冲压机冲出铁皮盖,再将熔融的垫片材料加注到铁盖上;最后将加有熔融的垫片材料的铁盖冲压定型。而在该过程中,当冲压机冲出铁皮盖后,剩余的铁片,即为花铁,一般被当成废品卖掉,花铁上还留存之前已涂的粘合剂,这造成了很多涂料及粘合剂都涂在没用的地方,涂料及粘合剂浪费严重。另外,在整个瓶盖的生产过程中,生产设备较多,从上述生产过程中看,至少需要印刷机、涂料机、烘房等设备,过程复杂,需要的投入也就增多,同时在生产过程中需把关的环节也变多,这容易造成加重企业的负担。
因此,亟需一种瓶盖生产工艺,既能简化生产工艺,同时还能节省粘合剂的使用,从而降低企业的生产费用。
发明内容
本发明要解决的技术问题是提供一种瓶盖印刷新工艺,该工艺通过印刷辊轮直接将粘合剂印制于铁片上,一方面可以彻底解决粘合剂附着于花铁上浪费的问题,另一方面使得整个工艺无需进行铁片的涂布,减少了涂料机这个环节,实现了生产工艺的简化。
为了解决上述技术问题,本发明的技术方案为一种瓶盖印刷新工艺,包括胶粘剂印刷步骤,具体如下:
胶粘剂印刷:通过凸印的方式,将表面附着胶粘剂压印于铁皮上,该胶粘剂为单组份高温固化聚氨酯胶粘剂,其由聚氨酯预聚体与扩链剂复配而成,聚氨酯预聚体的合成材料包括聚醚多元醇,聚酯多元醇,二异氰酸酯,催化剂,有机溶剂,其中,二异氰酸酯中的异氰酸酯基与聚醚多元醇、聚酯多元醇总的羟基的摩尔比为2 : 1 ~ 4 : 1,聚醚多元醇和聚酯多元醇的摩尔比为1 : 1 ~ 3 : 1。
进一步优选,胶粘剂呈凝胶状。
进一步优选,聚醚多元醇包括聚氧化丙烯多元醇、聚四氢呋喃多元醇、四氢呋喃-氧化丙烯共聚多元醇、聚乙二醇中的至少一种,聚醚多元醇的分子量范围在400 ~ 4000。
进一步优选,聚酯多元醇包括己二酸系聚酯多元醇、聚己内酯聚酯多元醇中的至少一种,聚酯多元醇的分子量范围在1000 ~ 2000。
进一步优选,二异氰酸酯包括甲苯二异氰酸酯、异佛尔酮二异氰酸酯、二苯基甲烷二异氰酸酯、二环己基甲烷二异氰酸酯、六亚甲基二异氰酸酯中的至少一种。
进一步优选,所述催化剂的用量为聚醚多元醇,聚酯多元醇,二异氰酸酯总质量的0.2 ~ 0.4%;再进一步优选,再进一步优选,所述的催化剂为单独的有机锡催化剂或为有机锡催化剂和有机铋催化剂的混合物;更进一步优选,所述催化剂同时包含有机锡催化剂和有机铋催化剂;再更进一步优选,所述有机锡催化剂包括二月桂酸二丁基锡、辛酸亚锡、二(十二烷基硫)二丁基锡、二醋酸二丁基锡中的至少一种,所述有机铋催化剂选自新癸酸铋、月桂酸铋、异辛酸铋、环烷酸铋中的至少一种;所述的有机锡催化剂和有机铋催化剂在添加到反应体系之前按质量比1:1-2进行混合。
进一步优选,有机溶剂包括甲苯、二甲苯、丙酮、乙酸乙酯中的至少一种。
进一步优选,聚氨酯预聚体中的异氰酸酯基与扩链剂含有的羟基的摩尔比为2 :1~ 1 : 1;再进一步优选,所述扩链剂包括1,3-丁二醇、1,4-丁二醇、丙二醇、丙三醇、三羟甲基丙烷中的至少一种。
进一步优选,封端剂与异氰酸酯基的摩尔比为1 : 2 ~ 3 : 2,封端剂包括丙酮肟、甲乙酮肟、苯酚、邻氯苯酚、己内酰胺中的至少一种。
进一步优选,一种单组份高温固化聚氨酯胶粘剂的制备方法如下:
S1.在反应器里添加上述的聚醚多元醇,聚酯多元醇,二异氰酸酯,预热至75 ~ 85℃;
S2.滴加上述催化剂,反应时间为30分钟至2小时;
S3.滴加封端剂,反应温度为45 ~ 75℃,反应时间为30分钟至1小时;
S4.在所述的步骤S3的基础上通过有机溶剂调节反应体系的黏度,用量为整个反应体系体积的1 ~ 10%;
S5.加入所述扩链剂,反应温度为55 ~ 75℃,反应时间为15分钟至1小时。
采用上述技术方案,由于采用凸版的印刷辊直接附着胶粘剂并压印于铁片上,避免了传统的涂布胶粘剂于铁片上所带来的胶粘剂的浪费,而采用相匹配的胶粘剂技术,则保证了本发明方案的实现,其对于印刷辊凸位还是对于铁片来说均具有良好的吸附性能。
具体实施方式
下面对本发明的具体实施方式作进一步说明。在此需要说明的是,对于这些实施方式的说明用于帮助理解本发明,但并不构成对本发明的限定。此外,下面所描述的本发明各个实施方式中所涉及的技术特征只要彼此之间未构成冲突就可以相互组合。
传统的金属瓶盖涂布胶粘剂的工艺,其所带来的是冲出位置外的铁片位置的胶粘剂的大量浪费,而本发明通过改变其工艺制造过程,彻底解决了该问题,传统的瓶盖制造过程为图案印刷、涂布胶粘剂、烘干、冲压、垫片材料加注以及最后的铁盖冲压定型,而采用本发明的技术,其制造过程为图案印刷、胶粘剂压印、烘干、冲压、垫片材料加注以及最后的铁盖冲压定型,胶粘剂压印是指直接通过凸印辊轮附着胶粘剂,然后将其压印于铁片对应位置处,而实现该过程,需要相应的胶粘剂进行配合,而传统的瓶盖制造过程中所用的胶粘剂,其只是适合用于涂布,由于其粘度小,同时对金属,特别是辊轮凸位处的附着力有限,导致了传统用于涂布的胶粘剂并不适用于本发明的工艺。
而本发明中采用的胶粘剂,通过将聚醚多元醇,聚酯多元醇,二异氰酸酯进行复配,制成预聚体,并进一步与扩链剂进行反应,所得的胶粘剂在150℃下只需9-13分钟即可固化,并且由于其为单组分高温固化的聚氨酯,在使用时无需再考虑与其他组分进行提前混合,同时制得的胶粘剂储存性能优异,常温密闭储存时间超过100天,另外胶粘剂固化后,经在铁片上测试,其拉伸强度可达到12.1Mpa,完全满足作为铁片与垫片的吸附介质。而由于其具有强的吸附性能,因此辊轮凸位的设计可以更加合理化,如可以通过试验减少辊轮凸位的表面积,从而做到在保证吸附效果的情况下,减少胶粘剂的用量。
本发明对于凸印的具体实施并无限制,只要其能够完成于铁片表面的进行胶粘剂的压印即可,其具体的实施可以为辊轮滚动的方式,也可以是单个凸位的阵列组合。
实施例1
本实施例胶粘剂的制备:
具体的反应条件为:
S1.在反应器里添加聚氧化丙烯二醇,己二酸聚酯二醇,甲苯二异氰酸酯,其中异氰酸酯基和羟基的摩尔比为2 : 1,聚氧化丙烯二醇和己二酸聚酯二醇的摩尔比为1 : 1,预热至75 ~ 85℃;
S2.在S1的温度条件下,滴加二月桂酸二丁基锡催化剂,其用量为S1步骤中反应体系总质量的0.4%,反应时间为30分钟至2小时;
S3.滴加封端剂丙酮肟,封端剂与甲苯二异氰酸酯的异氰酸酯基的摩尔比为1 :2,反应温度为45 ~ 75℃,反应时间为30分钟至1小时;
S4.在步骤S3的基础上通过甲苯调节反应体系的黏度,用量为整个反应体系体积的7%;
S5. 加入扩链剂1,3-丁二醇,反应温度为55 ~ 75℃,反应时间为15分钟至1小时,其中异氰酸酯基和扩链剂中含有的羟基的摩尔比为2 : 1,反应完成后即得到单组份高温固化聚氨酯胶粘剂。
对聚氨酯胶粘剂的固化性能,力学性能以及储存性能按国家标准进行测试,其中,拉伸强度参照GB/T 528-2009检测;分别测试15分钟以及7天固化后的情况,对应作为初粘强度和终粘强度的检测。
经测试,本实施例的胶粘剂符合生产工艺的需求,具体性能参数如下:
将聚氨酯胶粘剂置于金属板上,在150℃下加热10分钟即固化;
而对聚氨酯胶粘剂的力学性能进行测试,初粘强度为0.46MPa,终粘强度为7.5Mpa,拉伸强度10.3Mpa,断裂伸长率为330%;
将制备的胶粘剂置于物料槽中,而将胶粘剂设置成凝胶状,更有利于辊轮凸位附着胶粘剂,辊轮平移至该物料槽上方并滚动,使该辊轮的凸位完全附着胶粘剂,后平移到铁片上方,于铁片的一端开始进行滚动压印,将胶粘剂压印于设定的位置处,再将铁片于150~180℃条件下烘干,预固化,再通过冲压机冲出铁皮盖,后将熔融的垫片材料加注到铁盖上;最后将加有熔融的垫片材料的铁盖冲压定型,即完成瓶盖的制作。
实施例2
本实施例中:
聚醚多元醇选择聚四氢呋喃三元醇;
聚酯多元醇选择聚己内酯聚酯二醇;
二异氰酸酯选择异佛尔酮二异氰酸酯;
有机锡催化剂选择辛酸亚锡;
有机溶剂选择甲苯;
扩链剂选择1,4-丁二醇;
封端剂选择甲乙酮肟;
其中,异氰酸酯基(异佛尔酮二异氰酸酯)和羟基(聚四氢呋喃三元醇、聚己内酯聚酯二醇加总)的摩尔比为3 : 1,聚四氢呋喃三元醇和聚己内酯聚酯二醇的摩尔比为2 : 1,辛酸亚锡添加量为反应体系总质量的0.3%,异氰酸酯基和扩链剂中含有的羟基的摩尔比为1: 1,封端剂与异氰酸酯基的摩尔比为2 : 2,采用有机溶剂二甲苯调节反应体系的黏度,用量为反应体系体积的3%。
胶粘剂制备步骤参照实施例1,经测试,本实施例的胶粘剂符合生产工艺的需求,具体性能参数如下:
将聚氨酯胶粘剂置于金属板上,在150℃下加热13分钟即固化;
而对聚氨酯胶粘剂的力学性能进行测试,初粘强度为0.40MPa,终粘强度为7.1Mpa,拉伸强度11.5 Mpa,断裂伸长率为305%;
本实施例采用单个凸位阵列的方式进行胶粘剂的压印,本实施例除上述区别外,其他制备条件及步骤均与实施例1相同。
实施例3
本实施例中:
聚醚多元醇选择四氢呋喃-氧化丙烯共聚二醇;
聚酯多元醇选择聚己内酯聚酯三醇;
二异氰酸酯选择二苯基甲烷二异氰酸酯;
有机锡催化剂选择二(十二烷基硫)二丁基锡;
有机溶剂选择丙酮;
扩链剂选择丙二醇;
封端剂选择苯酚;
其中,异氰酸酯基(二苯基甲烷二异氰酸酯)和羟基(四氢呋喃-氧化丙烯共聚二醇、聚己内酯聚酯三醇加总)的摩尔比为4 : 1,四氢呋喃-氧化丙烯共聚二醇和聚己内酯聚酯三醇的摩尔比为3 : 1,辛酸亚锡添加量为反应体系总质量的0.2%,异氰酸酯基和扩链剂中含有的羟基的摩尔比为1: 1,封端剂与异氰酸酯基的摩尔比为3 : 2,采用有机溶剂丙酮调节反应体系的黏度,用量为反应体系体积的10%。
胶粘剂制备步骤参照实施例1,经测试,本实施例的胶粘剂符合生产工艺的需求,具体性能参数如下:
将聚氨酯胶粘剂置于金属板上,在150℃下加热12分钟即固化;
而对聚氨酯胶粘剂的力学性能进行测试,初粘强度为0.35MPa,终粘强度为7.7Mpa,拉伸强度12.1 Mpa,断裂伸长率为373%;
本实施例采用辊轮的方式进行胶粘剂的压印,本实施例除上述区别外,其他制备条件及步骤均与实施例1相同。
实施例4
本实施例中:
聚醚多元醇选择聚乙二醇;
聚酯多元醇选择己二酸聚酯二醇;
二异氰酸酯选择六亚甲基二异氰酸酯;
催化剂选择二月桂酸二丁基锡和新癸酸铋,两者按质量比1:2进行混合;
有机溶剂选择乙酸乙酯;
扩链剂选择三羟甲基丙烷;
封端剂选择己内酰胺;
其中,异氰酸酯基(六亚甲基二异氰酸酯)和羟基(聚乙二醇、己二酸聚酯二醇加总)的摩尔比为2 : 1,聚乙二醇和己二酸聚酯二醇的摩尔比为1 : 1,催化剂添加量为反应体系总质量的0.3%,异氰酸酯基和扩链剂中含有的羟基的摩尔比为1: 1,封端剂与异氰酸酯基的摩尔比为2 : 2,采用有机溶剂乙酸乙酯调节反应体系的黏度,用量为反应体系体积的5%。
胶粘剂制备步骤参照实施例1,经测试,本实施例的胶粘剂符合生产工艺的需求,具体性能参数如下:
将聚氨酯胶粘剂置于金属板上,在150℃下加热10分钟即固化;
而对聚氨酯胶粘剂的力学性能进行测试,初粘强度为0.53MPa,终粘强度为7.9Mpa,拉伸强度10.5 Mpa,断裂伸长率为358%;
本实施例的聚氨酯胶粘剂无需冷藏,常温密闭储存时间超过100天。
本实施例采用辊轮的方式进行胶粘剂的压印,本实施例除上述区别外,其他制备条件及步骤均与实施例1相同。
实施例5
本实施例中:
聚醚多元醇选择聚乙二醇;
聚酯多元醇选择己二酸聚酯二醇;
二异氰酸酯选择六亚甲基二异氰酸酯;
催化剂选择辛酸亚锡和环烷酸铋,两者按质量比1:1进行混合;
有机溶剂选择乙酸乙酯;
扩链剂选择三羟甲基丙烷;
封端剂选择己内酰胺;
其中,异氰酸酯基(六亚甲基二异氰酸酯)和羟基(聚乙二醇、己二酸聚酯二醇加总)的摩尔比为2 : 1,聚乙二醇和己二酸聚酯二醇的摩尔比为1 : 1,催化剂添加量为反应体系总质量的0.3%,异氰酸酯基和扩链剂中含有的羟基的摩尔比为1: 1,封端剂与异氰酸酯基的摩尔比为2 : 2,采用有机溶剂乙酸乙酯调节反应体系的黏度,用量为反应体系体积的5%。
胶粘剂制备步骤参照实施例1,经测试,本实施例的胶粘剂符合生产工艺的需求,具体性能参数如下:
将聚氨酯胶粘剂置于金属板上,在150℃下加热9分钟即固化;
而对聚氨酯胶粘剂的力学性能进行测试,初粘强度为0.5MPa,终粘强度为8.4Mpa,拉伸强度10.3Mpa,断裂伸长率为378%;
本实施例的聚氨酯胶粘剂无需冷藏,常温密闭储存时间超过100天。
本实施例采用辊轮的方式进行胶粘剂的压印,本实施例除上述区别外,其他制备条件及步骤均与实施例1相同。
本发明的实施,一方面依赖于工艺过程的改进,另一方面依赖于新开发的聚氨酯胶粘剂的应用,该聚氨酯胶粘剂对金属的附着性强,通过初粘强度可以看出,本发明的初粘强度高,有利于附着于加工设备上,同时通过多种组分的配比,有利于改善对金属物件的附着性。
另外,通过将实施例1-3与实施例4-5对比可以发现,在实施例4-5中减少有机锡催化剂,并换成有机铋催化剂,本领域技术人员清楚,有机铋催化剂相对于有机锡催化剂来说,其催化效率要低得多,但其固化时间却并不比实施例1-3慢,而且反而更快,证明有机锡催化剂与有机铋催化剂一起可以加快催化效率,起到协同增效的作用,固化时间缩短也有利于加快生产流程。
以上对本发明的实施方式作了详细说明,但本发明不限于所描述的实施方式。对于本领域的技术人员而言,在不脱离本发明原理和精神的情况下,对这些实施方式进行多种变化、修改、替换和变型,仍落入本发明的保护范围内。

Claims (9)

1.一种瓶盖印刷新工艺,其特征在于:包括胶粘剂印刷步骤,具体如下,
胶粘剂印刷:通过凸印的方式,将表面附着胶粘剂压印于铁皮上,该胶粘剂为单组份高温固化聚氨酯胶粘剂,其由聚氨酯预聚体与扩链剂复配而成,聚氨酯预聚体的合成材料包括聚醚多元醇、聚酯多元醇、二异氰酸酯、催化剂、有机溶剂以及封端剂,其中,二异氰酸酯中的异氰酸酯基与聚醚多元醇、聚酯多元醇总的羟基的摩尔比为2 : 1 ~ 4 : 1,聚醚多元醇和聚酯多元醇的摩尔比为1 : 1 ~ 3 : 1, 所述胶粘剂呈凝胶状,所述聚醚多元醇包括聚氧化丙烯多元醇、聚四氢呋喃多元醇、四氢呋喃-氧化丙烯共聚多元醇、聚乙二醇中的至少一种,所述聚酯多元醇包括己二酸系聚酯多元醇、聚己内酯聚酯多元醇中的至少一种,所述封端剂包括丙酮肟、甲乙酮肟、苯酚、邻氯苯酚、己内酰胺中的至少一种。
2.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:聚醚多元醇的分子量范围在400 ~ 4000。
3.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:所述聚酯多元醇的分子量范围在1000 ~ 2000。
4.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:所述二异氰酸酯包括甲苯二异氰酸酯、异佛尔酮二异氰酸酯、二苯基甲烷二异氰酸酯、二环己基甲烷二异氰酸酯、六亚甲基二异氰酸酯的至少一种。
5.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:所述催化剂的用量为聚醚多元醇,聚酯多元醇,二异氰酸酯总质量的0.2 ~ 0.4%,所述的催化剂为单独的有机锡催化剂或为有机锡催化剂和有机铋催化剂的混合物,所述有机锡催化剂选自二月桂酸二丁基锡、辛酸亚锡、二(十二烷基硫)二丁基锡、二醋酸二丁基锡中的至少一种;所述有机铋催化剂选自新癸酸铋、月桂酸铋、异辛酸铋、环烷酸铋中的至少一种。
6.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:所述有机溶剂包括甲苯、二甲苯、丙酮、乙酸乙酯的至少一种,所述封端剂与异氰酸酯基的摩尔比为1 : 2 ~ 3 : 2。
7.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:所述异氰酸酯基与扩链剂含有的羟基的摩尔比为2 : 1~ 1 : 1,所述扩链剂包括1,3-丁二醇,1,4-丁二醇,丙二醇,丙三醇,三羟甲基丙烷的至少一种。
8.根据权利要求1-7中任一项所述的瓶盖印刷新工艺,其特征在于:所述胶粘剂的制备方法如下:
S1.在反应器里添加上述的聚醚多元醇,聚酯多元醇,二异氰酸酯,预热至75 ~ 85℃;
S2.滴加所述催化剂,反应时间为30分钟至2小时;
S3.滴加封端剂,反应温度为45 ~ 75℃,反应时间为30分钟至1小时;
S4.在所述的步骤S3的基础上通过有机溶剂调节反应体系的黏度,用量为整个反应体系体积的1 ~ 10%;
S5.加入所述扩链剂,反应温度为55 ~ 75℃,反应时间为15分钟至1小时。
9.根据权利要求1所述的瓶盖印刷新工艺,其特征在于:所述凸印的载体为辊轮或由柱体阵列而成。
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