CN106318255B - 一种透明胶带的制备工艺 - Google Patents

一种透明胶带的制备工艺 Download PDF

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CN106318255B
CN106318255B CN201610730603.6A CN201610730603A CN106318255B CN 106318255 B CN106318255 B CN 106318255B CN 201610730603 A CN201610730603 A CN 201610730603A CN 106318255 B CN106318255 B CN 106318255B
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张孝俤
王翠冈
俞健钧
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Jiangsu Wohang High Technology Co.,Ltd.
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Abstract

本发明涉及一种透明胶带的制备工艺,所述制备工艺包括以下步骤:第一步,制备透明胶带用水性压敏胶;第二步,将第一步中的水性压敏胶通过涂布机以220‑250m/min的速度涂覆于双向拉伸聚丙烯薄膜基材层上,涂布后进85‑130℃烘箱进行高温塑化后生成稳定的水性压敏胶胶黏层;第三步,收卷。本发明的优点在于:本发明透明胶带的制备工艺,通过对制备过程中用水性压敏胶配方的改进,将配方中的乳化剂十二烷基硫酸钠改用十二烷基苯磺酸钠,进而使得乳化剂的使用量,大大减少,从而可提高水性压敏胶的涂布速度,缩短水性压敏胶烘干时间,且烘干时间与传统工艺相比,可以缩短18%~28%,进而大大提高了生产效率。

Description

一种透明胶带的制备工艺
技术领域
本发明属于胶粘材料技术领域,特别涉及一种透明胶带的制备工艺。
背景技术
OPP透明胶带是以双向拉伸聚丙烯薄膜为基材,然后再经过加温均匀涂抹压敏胶乳液所制成的胶带。OPP胶带属于高质量和高性能的胶带,且在极端恶劣的气候下,其性能也是良好的。使用OPP胶带可以对仓库里货物进行封存、对集装箱进行装运,还可以防止货物偷窃、违法开启等。
现OPP透明胶带的生产工艺过程中,水性压敏胶一般以180m/min涂布速度进行涂布,使得烘干时间长,进而使得整个生产工序时间增长,大大降低了生产效率。
因此,研发一种能够提高涂布速度、缩短烘干时间,进而提高生产效率的透明胶带的制备工艺是非常有必要的。
发明内容
本发明要解决的技术问题是提供一种能够提高涂布速度、缩短烘干时间,进而提高生产效率的透明胶带的制备工艺。
为解决上述技术问题,本发明的技术方案为:一种透明胶带的制备工艺,其创新点在于:所述制备工艺包括以下步骤:
第一步,制备透明胶带用水性压敏胶,该水性压敏胶进一步通过以下工艺获得:
步骤1.在反应容器A中加入去离子水、乳化剂、甲基丙烯酸甲酯、丙烯酸、丙烯酸酯类化合物和丙烯酸丁酯进行乳化聚合反应,乳化聚合反应结束后,再加入引发剂,得到乳化液,且所述去离子水、十二烷基苯磺酸钠乳化剂、甲基丙烯酸甲酯、丙烯酸、丙烯酸酯类化合物、丙烯酸丁酯和引发剂的质量比为8-25:1-10:1-10:0.5-10:1-15:20-60:0.2-2;
步骤2.在反应容器B中加入去离子水,并升温至70-80℃,然后依次加入pH缓冲剂和引发剂,再次升温至75-85℃,待温度稳定后,开始滴加步骤1中的乳化液,滴加温度控制在81-83℃,滴加时间控制在4-5h,且所述去离子水与引发剂的质量比为8-25:0.3-3;
步骤3.乳化液全部滴加完成后,保温0.5-1.5h,然后降温至70-75℃,开始滴加氧化剂和还原剂,所述氧化剂和还原剂的质量比为1:1,滴加完成后,保温30-40min,再降温;
步骤4.待温度降温至55-60℃,加入分子量调节剂于反应容器B中,并搅拌反应30-40min,取样测含量,再补加适量的去离子水,得到水性压敏胶粗品,且分子量调节剂与去离子水的质量比为0.1-1:4-10;
步骤5.将步骤4中的水性压敏胶粗品降温至50-55℃,然后过滤即得水性压敏胶;
第二步,将第一步中的水性压敏胶通过涂布机以220-250m/min的速度涂覆于双向拉伸聚丙烯薄膜基材层上,涂布后进85-130℃烘箱进行高温塑化后生成稳定的水性压敏胶胶黏层;
第三步,收卷。
进一步地,所述第一步中丙烯酸酯类化合物为丙烯酸羟乙酯或丙烯酸羟丙酯或两者的混合物;引发剂为过硫酸铵或过硫酸钾或两者的混合物;分子量调节剂为正十二硫醇或叔十二硫醇或两者的混合物;氧化剂为叔丁基过氧化氢;还原剂为甲醛次硫酸氢钠或抗坏血酸或两者的混合物。
进一步地,所述水性压敏胶胶黏层的厚度为20-24µm。
本发明的优点在于:
(1)本发明透明胶带的制备工艺,通过对制备过程中用水性压敏胶配方的改进,将配方中的乳化剂十二烷基硫酸钠改用十二烷基苯磺酸钠,进而使得乳化剂的使用量,大大减少,从而可提高水性压敏胶的涂布速度,缩短水性压敏胶烘干时间,且烘干时间与传统工艺相比,可以缩短18%~28%,进而大大提高了生产效率;
(2)本发明透明胶带的制备工艺,制备过程中,使用的水性压敏胶,添加了分子量调节剂,其具有较强的转移能力,只需少量加入便可明显降低产品分子量,并可通过调节其用量来控制分子量;且分子量调节剂选用的是正十二硫醇或叔十二硫醇或两者的混合物,为常用的分子量调节剂,成本相对较低;添加的氧化剂叔丁基过氧化氢,为重要的有机氧化物,可用作聚烯酸乳液聚合单体消除后的引发剂,提高聚合反应速率,进而保证产品的储存期;添加的还原剂甲醛次硫酸氢钠或抗坏血酸或两者的混合物,具有较强的还原性,能够用作水性压敏胶的活化剂,增加水性压敏胶的活性。
具体实施方式
下面的实施例可以使本专业的技术人员更全面地理解本发明,但并不因此将本发明限制在所述的实施例范围之中。
实施例1
本实施例透明胶带的制备工艺,该制备工艺包括以下步骤:
第一步,制备透明胶带用水性压敏胶,该水性压敏胶进一步通过以下工艺获得:
步骤1. 在乳化釜中加入8kg去离子水、10kg乳化剂、10kg甲基丙烯酸甲酯、10kg丙烯酸、15kg丙烯酸羟乙酯或丙烯酸羟丙酯或两者的混合物及60kg丙烯酸丁酯进行乳化聚合反应,乳化聚合反应结束后,再加入2kg引发剂,得到乳化液;
步骤2. 在反应锅中加入8kg去离子水,并升温至70-80℃,然后依次加入pH缓冲剂及3kg过硫酸铵或过硫酸钾或两者的混合物,再次升温至75-85℃,待温度稳定后,开始滴加步骤1中的乳化液,滴加温度控制在81-83℃,滴加时间控制在4-5h;
步骤3. 乳化液全部滴加完成后,保温0.5-1.5h,然后降温至70-75℃,开始滴加1kg叔丁基过氧化氢及1kg甲醛次硫酸氢钠或抗坏血酸或两者的混合物,滴加完成后,保温30-40min,再降温;
步骤4. 待温度降温至55-60℃,加入1kg正十二硫醇或叔十二硫醇或两者的混合物于反应锅中,并搅拌反应30-40min,取样测含量,再补加4kg的去离子水,得到水性压敏胶粗品;
步骤5. 将步骤4中的水性压敏胶粗品降温至50-55℃,然后用200目过滤袋过滤即得水性压敏胶;
第二步,将第一步中的水性压敏胶通过涂布机以220m/min的速度涂覆于双向拉伸聚丙烯薄膜基材层上,涂布后进85-130℃烘箱进行高温塑化后生成厚度为20-24µm稳定的水性压敏胶胶黏层;
第三步,收卷。
实施例2
本实施例透明胶带的制备工艺,该制备工艺包括以下步骤:
第一步,制备透明胶带用水性压敏胶,该水性压敏胶进一步通过以下工艺获得:
步骤1. 在乳化釜中加入25kg去离子水、1kg乳化剂、1kg甲基丙烯酸甲酯、0.5kg丙烯酸、1kg丙烯酸羟乙酯或丙烯酸羟丙酯或两者的混合物及20kg丙烯酸丁酯进行乳化聚合反应,乳化聚合反应结束后,再加入0.2kg引发剂,得到乳化液;
步骤2. 在反应锅中加入25kg去离子水,并升温至70-80℃,然后依次加入pH缓冲剂及0.3kg过硫酸铵或过硫酸钾或两者的混合物,再次升温至75-85℃,待温度稳定后,开始滴加步骤1中的乳化液,滴加温度控制在81-83℃,滴加时间控制在4-5h;
步骤3. 乳化液全部滴加完成后,保温0.5-1.5h,然后降温至70-75℃,开始滴加0.1kg叔丁基过氧化氢及0.1kg甲醛次硫酸氢钠或抗坏血酸或两者的混合物,滴加完成后,保温30-40min,再降温;
步骤4. 待温度降温至55-60℃,加入0.1kg正十二硫醇或叔十二硫醇或两者的混合物于反应锅中,并搅拌反应30-40min,取样测含量,再补加10kg的去离子水,得到水性压敏胶粗品;
步骤5. 将步骤4中的水性压敏胶粗品降温至50-55℃,然后用200目过滤袋过滤即得水性压敏胶;
第二步,将第一步中的水性压敏胶通过涂布机以250m/min的速度涂覆于双向拉伸聚丙烯薄膜基材层上,涂布后进85-130℃烘箱进行高温塑化后生成厚度为20-24µm稳定的水性压敏胶胶黏层;
第三步,收卷。
实施例3
本实施例透明胶带的制备工艺,该制备工艺包括以下步骤:
第一步,制备透明胶带用水性压敏胶,该水性压敏胶进一步通过以下工艺获得:
步骤1. 在乳化釜中加入16.5kg去离子水、5.5kg乳化剂、5.5kg甲基丙烯酸甲酯、5.25kg丙烯酸、8kg丙烯酸羟乙酯或丙烯酸羟丙酯或两者的混合物及40kg丙烯酸丁酯进行乳化聚合反应,乳化聚合反应结束后,再加入1.1kg引发剂,得到乳化液;
步骤2. 在反应锅中加入16.5kg去离子水,并升温至70-80℃,然后依次加入pH缓冲剂及1.65kg过硫酸铵或过硫酸钾或两者的混合物,再次升温至75-85℃,待温度稳定后,开始滴加步骤1中的乳化液,滴加温度控制在81-83℃,滴加时间控制在4-5h;
步骤3. 乳化液全部滴加完成后,保温0.5-1.5h,然后降温至70-75℃,开始滴加0.55kg叔丁基过氧化氢及0.55kg甲醛次硫酸氢钠或抗坏血酸或两者的混合物;
步骤4. 待温度降温至55-60℃,加入0.55kg正十二硫醇或叔十二硫醇或两者的混合物于反应锅中,并搅拌反应30-40min,取样测含量,再补加7kg的去离子水,得到水性压敏胶粗品;
步骤5. 将步骤4中的水性压敏胶粗品降温至50-55℃,然后用200目过滤袋过滤即得水性压敏胶;
第二步,将第一步中的水性压敏胶通过涂布机以235m/min的速度涂覆于双向拉伸聚丙烯薄膜基材层上,涂布后进85-130℃烘箱进行高温塑化后生成厚度为20-24µm稳定的水性压敏胶胶黏层;
第三步,收卷。
下表是实施例1~3透明胶带的制备工艺与传统透明胶带的制备工艺的对比:
实施例1 实施例2 实施例3 传统
涂布速度/(m/min) 220 250 235 180
烘干时间/(min) 1.63 1.44 1.53 2
注:上述实施例与传统制备方法的对比,均以360m透明胶带为例进行比较的。
由上表可以看出,通过对制备过程中用水性压敏胶配方的改进,将配方中的乳化剂十二烷基硫酸钠改用十二烷基苯磺酸钠,进而使得乳化剂的使用量,大大减少,从而可提高水性压敏胶的涂布速度,缩短水性压敏胶烘干时间,且烘干时间与传统工艺相比,可以缩短18%~28%,进而大大提高了生产效率。
以上显示和描述了本发明的基本原理和主要特征以及本发明的优点。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 (3)

1.一种透明胶带的制备工艺,其特征在于:所述制备工艺包括以下步骤:
第一步,制备透明胶带用水性压敏胶,该水性压敏胶进一步通过以下工艺获得:
步骤1.在反应容器A中加入去离子水、十二烷基苯磺酸钠乳化剂、甲基丙烯酸甲酯、丙烯酸、丙烯酸酯类化合物和丙烯酸丁酯进行乳化聚合反应,乳化聚合反应结束后,再加入引发剂,得到乳化液,且所述去离子水、十二烷基苯磺酸钠乳化剂、甲基丙烯酸甲酯、丙烯酸、丙烯酸酯类化合物、丙烯酸丁酯和引发剂的质量比为8-25:1-10:1-10:0.5-10:1-15:20-60:0.2-2;
步骤2.在反应容器B中加入去离子水,并升温至70-80℃,然后依次加入pH缓冲剂和引发剂,再次升温至75-85℃,待温度稳定后,开始滴加步骤1中的乳化液,滴加温度控制在81-83℃,滴加时间控制在4-5h,且所述去离子水与引发剂的质量比为8-25:0.3-3;
步骤3.乳化液全部滴加完成后,保温0.5-1.5h,然后降温至70-75℃,开始滴加氧化剂和还原剂,所述氧化剂和还原剂的质量比为1:1,滴加完成后,保温30-40min,再降温;
步骤4.待温度降温至55-60℃,加入分子量调节剂于反应容器B中,并搅拌反应30-40min,取样测含量,再补加适量的去离子水,得到水性压敏胶粗品,且分子量调节剂与去离子水的质量比为0.1-1:4-10;
步骤5.将步骤4中的水性压敏胶粗品降温至50-55℃,然后过滤即得水性压敏胶;
第二步,将第一步中的水性压敏胶通过涂布机以220-250m/min的速度涂覆于双向拉伸聚丙烯薄膜基材层上,涂布后进85-130℃烘箱进行高温塑化后生成稳定的水性压敏胶胶黏层;
第三步,收卷。
2.根据权利要求1所述的透明胶带的制备工艺,其特征在于:所述第一步中丙烯酸酯类化合物为丙烯酸羟乙酯或丙烯酸羟丙酯或两者的混合物;引发剂为过硫酸铵或过硫酸钾或两者的混合物;分子量调节剂为正十二硫醇或叔十二硫醇或两者的混合物;氧化剂为叔丁基过氧化氢;还原剂为甲醛次硫酸氢钠或抗坏血酸或两者的混合物。
3.根据权利要求1所述的透明胶带的制备工艺,其特征在于:所述水性压敏胶胶黏层的厚度为20-24µm。
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