CN113637421A - 一种可降解胶带及其制备方法 - Google Patents

一种可降解胶带及其制备方法 Download PDF

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CN113637421A
CN113637421A CN202110894665.1A CN202110894665A CN113637421A CN 113637421 A CN113637421 A CN 113637421A CN 202110894665 A CN202110894665 A CN 202110894665A CN 113637421 A CN113637421 A CN 113637421A
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黄爱宾
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Abstract

本发明公开了一种可降解胶带及其制备方法。一种可降解胶带,包括基膜层、离型层以及胶黏层;基膜层两面分别涂布离型层、胶黏层;所述的基膜层由PBAT或PBAT/PLA共混物拉伸而成;离型层由包含硅油的原料制成;胶黏层由聚乙二醇与二氯二苯砜合成。本发明可降解胶带可以应用于快递、物流、纸箱封合等领域,具有环保可降解、防水防潮、强度韧性高等优点,解决了现有快递行业普通BOPP胶带与纸箱不易拆分和带来的白色污染的问题。

Description

一种可降解胶带及其制备方法
技术领域
本发明属于包装辅助材料制造领域,具体涉及一种可降解胶带及其制备方法。
背景技术
胶带由基膜和胶黏剂两部分组成,通过粘结使得两个不相连的物品连接在一起。胶带的用途非常广泛,按照用途可分为电工绝缘胶带、耐高温胶带、保护膜胶带、封箱胶带、地毯胶带等。
目前快递行业大量使用封箱胶带,胶带基膜材料大多为BOPP或者PVC等材质,胶黏剂大多为丙烯酸酯类或乙烯-醋酸乙烯酯共聚物类胶黏剂,其性能优异,具备压敏胶性质,但无论基膜材料还是胶黏剂材料均为合成非降解材料,在其大量使用过程中,与纸箱不易分离,造成纸箱回收困难,同时非降解材料易造成白色污染。
中国专利公开号CN109796895A、CN109679519A、CN109517224A等专利文献提出了采用植物胶黏剂等方法解决胶带降解问题,这些专利公开技术方案虽有其优点,但植物胶黏剂不具备压敏性质,且涂胶工艺复杂,无法采用传统非降解胶带的涂胶工艺,给使用与推广上带来不便。
鉴于存在上述问题,有必要研发一种涂胶工艺简便、使用方便、避免白色污染的可降解的胶带。
发明内容
本发明的主要目的旨在于提供一种涂胶工艺简便、使用方便、可避免白色污染问题的可降解胶带及其制备方法。本发明可降解胶带具有环保可降解等优点,可有效减少白色污染,解决了现有快递行业用胶带不环保的问题。
本发明采取如下技术方案:
一种可降解胶带,包括基膜层、离型层以及胶黏层;基膜层两面分别涂布离型层、胶黏层;基膜层由PBAT(聚己二酸/对苯二甲酸丁二酯)或PBAT/PLA(聚己二酸/对苯二甲酸丁二酯/聚乳酸)拉伸而成;离型层由包含硅油的原料制备而成;胶黏层由聚乙二醇(优选聚乙二醇200、400、600、800)与二氯二苯砜合成。
优选的,基膜层包含以下重量分数的组分:
PBAT 60-80份
PLA 20-35份
增塑剂环氧大豆油0.5-3份
润滑剂0.2-0.8份
偶联剂0.1-0.5份。
优选的,离型层由包含硅油的原料成分:
乙烯基聚二甲基硅氧烷(重量分数90份)
甲基含氢聚硅氧烷(重量分数4份)
铂金催化剂(优选氯铂酸-异丙醇重量分数1份)
锚固剂(优选3-缩水甘油醚氧基丙基三乙氧基硅烷重量分数0.6份)
抑制剂(优选甲基丁炔醇重量分数0.1份)
溶剂甲苯(优选重量分数300份)。
本发明还公开了一种前述可降解胶带的制备方法,按如下步骤:
(1)制备基膜层,调配胶黏剂以及离型剂;
(2)基膜层的一面涂布离型剂,形成离型层;
(3)基膜层的另一面涂布胶黏剂,形成胶黏层。
优选的,胶黏剂涂覆于基膜层的方式为热熔复合或溶液复合。
优选的,基膜层的制备步骤:PBAT或PBAT/PLA共混物与一定量增塑剂环氧大豆油制备并挤出,制膜,双向拉伸获得。
优选的,基膜层的制造步骤中,采用双螺杆挤出造粒,单螺杆挤出吹膜,挤出加工温度165-190℃,膜双向拉伸。拉伸定型温度控制为纵向定型温度控制在60-70℃,横向定型温度控制在100-110℃。
优选的,胶黏层的制备步骤如下:
聚合度为200、400、600或800的聚乙二醇与羟基等摩尔量的二氯二苯砜等比例混合,以二甲亚砜为溶剂,于135-160℃下蒸馏6-12小时,二甲苯蒸馏带走生成水分。反应结束后于乙醚中沉淀产物。采用N’N-二甲基甲酰胺溶解,乙醚再沉淀提纯。
优选的,胶黏层与基膜层的复合步骤如下:
基膜层涂布离型层,采用两辊转移涂布方式,在基膜层上单面涂布有机硅,远红外辐射干燥方式干燥,干燥冷却后收卷。再次放卷,基膜层在非涂布离型层的另一面涂布胶黏剂以形成胶黏层,涂布方法为溶液涂布,采用乙酸乙酯或N’N-二甲基甲酰胺溶解胶黏剂配制成胶黏剂溶液,采用200-250线数的凹版涂布黏合剂溶液在基膜层上,红外干燥,干燥温度控制在45-60℃。冷却,收卷,分切。
本发明通过制备胶带基材与胶黏剂层的合成制备实现了胶带可降解,而且通过该工艺制备的胶带胶黏剂层室温下具有压敏性,可广泛应用于快递行业的封箱作业,减少了白色污染。
附图说明
图1为一种优选实施例胶黏剂的合成过程示意图。
图2为一种优选实施例可降解胶带的制备方法路线图。
图3为可降解胶带在土壤中(pH=6.0-6.5的土壤)的降解试验图。
具体实施例
为使本发明实施例的目的、技术方案和优点更加清楚,下面将对本发明实施例的技术方案进行清楚、完整的描述。显然,所描述的实施例是本发明的一部分实施例,而不是全部的实施例。基于所描述的本发明的实施例,本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例,都属于本发明的保护范围。
除非另作定义,本发明公开所使用的技术术语或者科学术语应当为本发明所属领域内普通技术人员所理解的通常含义。
实施例一
一种可降解胶带的制备方法,按如下步骤:
按重量分数PBAT 68份,PLA 23份,增塑剂环氧大豆油2份,润滑剂硬脂酸0.5份,偶联剂钛酸酯0.1份,165-175℃双螺杆挤出造粒,170℃单螺杆挤出吹膜,吹胀比4.0,牵引比30。膜双向拉伸。拉伸定型温度控制为纵向定型温度控制在60-70℃,横向定型温度控制在100-110℃。
同时,称取一定量的二氯二苯砜,置于1L的圆底烧瓶中,加入羟基与二氯二苯砜等摩尔量的聚乙二醇400,用二氯亚砜作为溶剂,二甲苯作为带水剂,于160℃油浴下蒸馏12小时,产物置于无水乙醚中沉淀。采用N’N-二甲基甲酰胺溶解,乙醚再沉淀提纯。乙酸乙酯配制成胶黏剂溶液。
同时,配制有机硅离型剂:
乙烯基聚二甲基硅氧烷(重量分数90份)
甲基含氢聚硅氧烷(重量分数4份)
铂金催化剂(氯铂酸-异丙醇重量分数1份)
锚固剂(3-缩水甘油醚氧基丙基三乙氧基硅烷重量分数0.6份)
抑制剂(甲基丁炔醇重量分数0.1份)
溶剂甲苯(重量分数300份)。
采用两辊转移涂布方式,在基膜层上单面涂布有机硅离型剂,远红外辐射干燥方式干燥,干燥冷却后收卷。再次放卷,基膜层在非涂布离型层的另一面涂布胶黏剂,涂布方法为溶液涂布,胶黏剂溶液,采用250线数的凹版涂布黏合剂溶液在基膜层上,红外干燥,干燥温度控制在45-60℃。冷却,收卷,分切。
本实施例制得的胶带可应用于快递行业封合纸箱等领域,以期避免白色污染问题。
实施例二
一种可降解胶带的制备方法,按如下步骤:
按重量分数PBAT 60份,PLA 35份,增塑剂环氧大豆油3份,润滑剂硬脂酸0.8份,偶联剂钛酸酯0.2份,170-180℃双螺杆挤出造粒,190℃单螺杆挤出吹膜,吹胀比4.5,牵引比33。膜双向拉伸。拉伸定型温度控制为纵向定型温度控制在65-70℃,横向定型温度控制在100-110℃。
同时,称取一定量的二氯二苯砜,置于1L的圆底烧瓶中,加入羟基与二氯二苯砜等摩尔量的聚乙二醇200,用二氯亚砜作为溶剂,二甲苯作为带水剂,于140℃油浴下蒸馏10小时,产物置于无水乙醚中沉淀。采用N’N-二甲基甲酰胺溶解,乙醚再沉淀提纯。N’N-二甲基甲酰胺配制成胶黏剂溶液。
同时,配制有机硅离型剂:
乙烯基聚二甲基硅氧烷(重量分数90份)
甲基含氢聚硅氧烷(重量分数4份)
铂金催化剂(氯铂酸-异丙醇重量分数1份)
锚固剂(3-缩水甘油醚氧基丙基三乙氧基硅烷重量分数0.6份)
抑制剂(甲基丁炔醇重量分数0.1份),
溶剂甲苯(重量分数300份)。
采用两辊转移涂布方式,在基膜层上单面涂布有机硅离型剂,远红外辐射干燥方式干燥,干燥冷却后收卷。再次放卷,基膜层在非涂布离型层的另一面涂布胶黏剂,涂布方法为溶液涂布,胶黏剂溶液,采用200线数的凹版涂布黏合剂溶液在基膜层上,红外干燥,干燥温度控制在50-60℃。冷却,收卷,分切。
本发明可降解胶带可应用于快递、物流、纸箱封合等领域,具有环保可降解、防水防潮、强度韧性高等优点,解决了现有快递行业普通BOPP胶带与纸箱不易拆分和带来的白色污染的问题。

Claims (8)

1.一种可降解胶带,其特征在于,包括基膜层、离型层以及胶黏层;所述的基膜层两面分别涂布离型层、胶黏层;所述的基膜层由PBAT或PBAT/PLA共混物拉伸而成;所述的离型层由包含硅油的原料制成;所述的胶黏层由聚乙二醇与二氯二苯砜合成。
2.如权利要求1所述的可降解胶带,其特征在于:所述的基膜层包含以下重量分数的组分:
Figure FDA0003197384570000011
3.如权利要求1所述的可降解胶带,其特征在于:所述的离型层由包含硅油的原料包含以下重量分数的组分:
Figure FDA0003197384570000012
4.一种如权利要求1-3任一项所述可降解胶带的制备方法,其特征是按如下步骤:
(1)制备基膜层,调配胶黏剂以及离型剂;
(2)基膜层的一面涂布离型剂,形成离型层;
(3)基膜层的另一面涂布胶黏剂,形成胶黏层。
5.根据权利要求4所述的一种可降解胶带的制备方法,其特征在于,所述的胶黏剂涂覆于基膜层的方式为热熔复合或溶液复合。
6.根据权利要求4所述的一种可降解胶带的制备方法,其特征在于,所述基膜层的制备步骤:PBAT或PBAT/PLA共混物与一定量增塑剂环氧大豆油制备并挤出,制膜,双向拉伸获得。
7.根据权利要求6所述的一种可降解胶带的制备方法,其特征在于,所述基膜层的制备步骤中,采用双螺杆挤出造粒,单螺杆挤出吹膜,挤出加工温度165-190℃,膜双向拉伸,拉伸定型温度控制为纵向定型温度控制在60-70℃,横向定型温度控制在100-110℃。
8.根据权利要求4-7任一项所述的一种可降解胶带的制备方法,其特征在于,胶黏剂的制备步骤如下:聚合度为200、400、600或800的聚乙二醇与羟基等摩尔量的二氯二苯砜等比例混合,二甲亚砜为溶剂,135-160℃下蒸馏6-12小时,二甲苯蒸馏带走生成水分;反应结束后于乙醚中沉淀产物;采用N’N-二甲基甲酰胺溶解,乙醚再沉淀提纯。
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