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CN106676946A - 一种多功能碳纳米管复合包装纸 - Google Patents

一种多功能碳纳米管复合包装纸 Download PDF

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CN106676946A
CN106676946A CN201710014998.4A CN201710014998A CN106676946A CN 106676946 A CN106676946 A CN 106676946A CN 201710014998 A CN201710014998 A CN 201710014998A CN 106676946 A CN106676946 A CN 106676946A
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carbon nanotube
paper
nanotube composite
composite packaging
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田然
杨玺
李辉
田原
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China Tobacco Yunnan Industrial Co Ltd
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03Non-macromolecular organic compounds
    • D21H17/05Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/11Halides
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/10Coatings without pigments
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06Paper forming aids
    • D21H21/08Dispersing agents for fibres
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/36Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04Physical treatment, e.g. heating, irradiating
    • D21H25/06Physical treatment, e.g. heating, irradiating of impregnated or coated paper

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  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Paper (AREA)

Abstract

本发明公开了一种多功能碳纳米管复合包装纸。以甘蔗纸浆为原料,经打浆、疏解制成纸浆分散液;将碳纳米管置于硝酸和硫酸的混合物中浸泡改性,用去离子水洗涤到中性,加入阳离子分散剂球磨分散,制成zeta电位为正的碳纳米管分散液;混合两种分散液成形为湿纸幅,再经浸胶、压榨和干燥制得产品。本发明赋予了纸张导电、耐高温、抗菌等性能,实现了真正意义上的纳米包装。该产品可以代替常规的包装用锡箔纸,特别适于食品包装的通电加热、抗菌等需求。碳纳米管均匀牢固的附着在纸浆纤维上,经摩擦、反吹碳纳米管不会脱落,同时显著增加纸张的结合强度。本发明工艺简便,成本低廉,具有良好的应用前景。

Description

一种多功能碳纳米管复合包装纸
技术领域
本发明属于包装材料技术领域,具体是涉及一种具有导电、加热、杀菌等特殊功能的碳纳米管复合包装纸。
背景技术
常规产品的包装需要普通的纸板箱就可以满足,而且成本较低,但要防止有害微生物的入侵、防止发生化学反应就需要包装材料具备除包装之外的其他功能,特别是一些有特殊用途的物品还需要包装纸材具有可加热、导电、防静电等多种功能。碳纳米管由于本身比表面积较大,耐高温,具有卓越的导热性能,极高的电学特性、优良的力学性质,并且也是一种很好的无机抗菌材料,因此有着很广泛的用途。采用碳纳米管和普通纸张纤维结合可以赋予纸张碳纳米管的许多优异性能,不仅可以作为包装材料,还可以实现特殊的用途。
现有技术中,有采用过滤方法复合碳纳米材料,但截留率低,碳纳米材料在普通植物纤维的空隙之间主要是成堆吸附。还有常规负载的碳纳米材料与植物纤维之间主要采用交联剂来固定,交联剂粒子容易将碳纳米材料包埋,纸张的导电、散热都受到了很大影响。另外还有报道采用石墨烯复合普通植物纤维作为包装用材,但该技术往往让纸张的透气性能变差,且容易脱落、掉粉,所以限制了其使用范围。
发明内容
本发明的目的在于针对现有技术的不足,提供一种多功能碳纳米管复合包装纸,赋予纳米包装纸材导电、耐高温、杀菌的性能,并防止包装纸中的纳米粒子脱落。
本发明的目的通过以下技术方案予以实现。
除非另有说明,本发明所采用的百分数均为质量百分数。
一种多功能碳纳米管复合包装纸,制备方法包括以下步骤:
(1)以风干甘蔗渣为原料,采用氧碱制浆,经过打浆、疏解制成纸浆分散液;
(2)将硝酸和硫酸按质量比1:3混合,碳纳米管置于混合酸中浸泡5h改性,再用去离子水洗涤到中性,风干备用;
(3)取备用的碳纳米管按质量比2:3加入阳离子分散剂,进行球磨分散,制成碳纳米管分散液,碳纳米管分散液zeta电位为正;
(4)取所述纸浆分散液和碳纳米管分散液按1:1的体积比混合,并搅拌让两种浆料电荷有效中合;
(5)在成形器上成形为湿纸幅,成形时通过真空抽吸脱水;
(6)成形后的湿纸幅再经过浸胶、压榨和干燥,即获得所需的碳纳米管复合包装纸。
所述的阳离子分散剂优选为十六烷基三甲基溴化铵。
调节所述真空抽吸脱水的真空度,使成形后的湿纸幅干度为20±1%。
所述的浸胶采用聚氨酯浸胶,并进行超级压光处理。
所述的干燥其工艺条件为温度90℃,时间15min;最终纸页干度为95±1%。
相对于现有技术,本发明具有以下优点:
(1)本发明采用碳纳米管来实现纸张的纳米特性,赋予纸张导电、耐高温、抗菌等性能,实现了真正意义上的纳米包装。该产品可以代替常规的包装用锡箔纸,特别适于食品包装的通电加热、抗菌等需求。
(2)采用含半纤维素较多的甘蔗渣纸浆,为碳纳米管复合过程提供更多的支链和官能团。
(3)碳纳米管经硝酸和硫酸制成的混酸浸泡改性后引入亲水基团,大大改善了碳纳米管的亲水性。
(4)采用十六烷基三甲基溴化铵分散碳纳米管溶液,能与阴离子、非离子、两性表面物质有良好的配位性;同时还能够改变碳纳米管分散液的电负性,使溶液整体带正电荷,从而有效提高了碳纳米管在纸浆中的留着率,使碳纳米管均匀牢固的附着在纸浆纤维上,经过摩擦、反吹测定,碳纳米管不会脱落,同时显著增加纸张的结合强度。
附图说明
图1为本发明碳纳米管复合包装纸的制备工艺示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步的详细说明,但附图和实施例并不是对本发明技术方案的限定,所有基于本发明教导所作的变化,都应该属于本发明的保护范围。
实施例1
制备碳纳米管复合包装纸,制备工艺流程见图1。
按表1的制浆工艺制备甘蔗渣纸浆,通过筛选采用得率49.8%纸浆浆料,称取一定的绝干浆料,经过PFI在10%浆浓下打浆、打浆度打到45°SR,通过疏解机疏解3000转,加水配制成2%浆料分散液;相同的方法配制两份,并分别测定其Zeta电位,相关结果见表2。取5ml硝酸和15ml硫酸混合,将碳纳米管置于混合酸中浸泡5h改性,使碳纳米管表面接枝上羧基和羟基官能团,再用去离子水洗涤到中性并风干。加入十六烷基三甲基溴化铵(质量为1.5倍碳纳米管)作为分散剂,进行球磨分散,球磨浓度1/600,制成碳纳米管分散液,赋予碳纳米管分散液zeta电位为正,分别测定其zeta电位,测试结果见表2,分别是+56.8mv和+70.2mv。按定量110g/m2的纸样称取配好纸浆分散液,将纸浆分散液和碳纳米管分散液按1:1体积混合,并搅拌让两种浆料电荷有效中合,然后在成形器上成形为湿纸幅,成形时通过真空抽吸脱水,调节真空度,使成形后的湿纸幅干度为20±1%。对湿纸幅采用2%聚氨酯浸胶,并进行超级压光处理,压榨,在温度90℃下干燥15min,控制最终纸页干度为95±1%,获得所需的碳纳米管复合包装纸。
纸张分别测定其相关性能,其中通过荧光白度的变化来衡量碳纳米管在纸浆中的留着率,具体见表3;从表3还可以看出,添加碳纳米管后赋予了纸张一定的导电性,纸张的电阻率在4200mΩ·cm左右,同时添加碳纳米管复合的纸张抗菌效率达到99%以上,满足了抗菌类产品包装纸的相关要求。
表1.制浆实验条件
注:蒸煮液比1:6,最高温度120℃,升温计时从80℃开始;
表2.浆料的zeta电位变化
注:两种浆料按相同体积进行混合;
表3.复合纸性能测定
注:抗菌率采用无纺布为空白样,统一采用吸收法测定,抗菌主要针对大肠杆菌和金黄色葡萄球菌。
实施例2
重复实施例1,有以下不同点:分别取纸浆样两份制备浆料(配制浆料电荷测定见表4),一份直接成形、施胶(2%聚氨酯)作为空白样;一份采用电荷为+50.2mv的碳纳米管分散液混合,搅拌后成形抄纸,两组样都采用90℃条件进行烘干,并测定相关性能指标,具体指标见表5;最终结果表明:复合纸页电阻率为3800mΩ·cm、抗菌率为99.9%,而普通纸张导电性和抗菌率都基本没有,其他性能指标均达到功能包装纸的要求,纸张的外面匀度较好,样品经过反吹颗粒脱落计数法测定,结果表面纸张表面碳纳米管粒子无脱落现象,相关性能指标满足包装的要求。
表4.浆料电荷测定
注:两种浆料按1:1体积进行混合;
表5.复合纸性能测定
注:表中普通纸张由于电阻率太大,无法测定其导电性;抗菌率采用吸收法测定。

Claims (5)

1.一种多功能碳纳米管复合包装纸,其特征在于:制备方法包括以下步骤:
(1)以风干甘蔗渣为原料,采用氧碱制浆,经过打浆、疏解制成纸浆分散液;
(2)将硝酸和硫酸按质量比1:3混合,碳纳米管置于混合酸中浸泡5h改性,再用去离子水洗涤到中性,风干备用;
(3)取备用的碳纳米管按质量比2:3加入阳离子分散剂,进行球磨分散,制成碳纳米管分散液,碳纳米管分散液zeta电位为正;
(4)取所述纸浆分散液和碳纳米管分散液按1:1的体积比混合,并搅拌让两种浆料电荷有效中合;
(5)在成形器上成形为湿纸幅,成形时通过真空抽吸脱水;
(6)成形后的湿纸幅再经过浸胶、压榨和干燥,即获得所需的碳纳米管复合包装纸。
2.根据权利要求1所述的多功能碳纳米管复合包装纸,其特征在于:所述的阳离子分散剂为十六烷基三甲基溴化铵。
3.根据权利要求1所述的多功能碳纳米管复合包装纸,其特征在于:调节所述真空抽吸脱水的真空度,使成形后的湿纸幅干度为20±1%。
4.根据权利要求1所述的多功能碳纳米管复合包装纸,其特征在于:所述的浸胶采用聚氨酯浸胶,并进行超级压光处理。
5.根据权利要求1所述的多功能碳纳米管复合包装纸,其特征在于:所述的干燥其工艺条件为温度90℃,时间15min;最终纸页干度为95±1%。
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Publication number Priority date Publication date Assignee Title
CN108570883A (zh) * 2017-03-13 2018-09-25 昆明纳太科技有限公司 碳纳米管复合滤纸及其制备方法
CN108570883B (zh) * 2017-03-13 2022-07-19 昆明纳太科技有限公司 碳纳米管复合滤纸及其制备方法

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Application publication date: 20170517