CN110023434B - 电池用粘着胶带 - Google Patents
电池用粘着胶带 Download PDFInfo
- Publication number
- CN110023434B CN110023434B CN201680091020.1A CN201680091020A CN110023434B CN 110023434 B CN110023434 B CN 110023434B CN 201680091020 A CN201680091020 A CN 201680091020A CN 110023434 B CN110023434 B CN 110023434B
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- Prior art keywords
- adhesive
- adhesive tape
- release agent
- battery
- rubber
- Prior art date
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- 125000000217 alkyl group Chemical group 0.000 claims description 26
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
- C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
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Abstract
本发明公开一种电池用粘着胶带,其为具有基材以及设置于该基材的一个面的粘着剂层的电池用粘着胶带,其特征在于,在该基材的与设有该粘着剂层的面相反一侧的面涂布有脱模剂,涂布有该脱模剂的面依据JIS K 7125:1999得到的静摩擦系数和动摩擦系数的最大值为0.6以下,并且,该电池用粘着胶带通过改善电池部件插入性从而能够提高电池的生产率。
Description
技术领域
本发明涉及一种电池用粘着胶带,更详细地说,涉及一种通过改善电池部件插入性从而能够提高电池的生产率的电池用粘着胶带。
背景技术
以往,在铅蓄电池、镍镉电池、镍氢电池、锂离子电池等二次电池中,出于芯固定、电极取出口的绝缘、终端固定、绝缘间隔物等各种目的而使用粘着胶带。二次电池例如通过在使用粘着胶带进行元件固定后,将电极组插入电池壳中,并封入电解液从而制造。
专利文献1中记载了一种二次电池用粘着胶带,其特征在于,在厚度30~300μm的聚丙烯膜基材面,以干燥时厚度10~50μm的层的形式具有以由聚异丁烯橡胶和/或丁基橡胶构成的橡胶成分以及饱和烃树脂作为主成分的粘着剂层。而且,说明了该粘着胶带对电解液稳定且能够长时间高水准地维持电池的输出功率。
专利文献2中记载了一种电池用粘着胶带,其为在基材的至少一个面具有粘着剂层且在非水系电解液二次电池内部使用的电池用粘着胶带,在60℃下,在碳酸亚乙酯/碳酸二乙酯混合溶剂中浸渍8小时后的厚度变化率为20%以下,浸渍后的180°剥离粘着力为0.5N/10mm以上。而且说明了,该粘着胶带不会引起电解液特性的降低,也不会引起由压迫导致的正/负极活性物质和隔膜的破坏、集电体与活性物质的密合性降低,能够进一步改善电极在电池壳内的装入适应性。
近年来,伴随以可穿戴终端为代表的终端的小型化,电池的小型化也发展,电极组表面、电池壳内部的空间也逐渐变小。因此,对电池用粘着胶带也要求薄型化。
然而,本发明人等认为:如专利文献1和2所记载的、仅使以往的粘着胶带薄型化时,在用于小型化的电池的用途中不一定充分。具体地说,例如在电池的制造工序中将电极组等电池部件插入电池壳内部等空间时,如果在电极组等电池部件的表面或空间内部使用粘着胶带则非常难以插入这样的课题受到了关注。以往的粘着胶带的电池部件插入性差,这可能会使电池的生产率降低。这样的课题在专利文献1和2中并未进行任何研究。
现有技术文献
专利文献
专利文献1:日本特开平9-165557号公报
专利文献2:日本特开2013-140765号公报
发明内容
发明要解决的课题
本发明的目的在于解决以上的课题。即,本发明的目的在于提供一种通过改善电池部件插入性从而能够提高电池的生产率的电池用粘着胶带。
用于解决课题的方法
本发明人等为了实现上述目的而进行了深入研究,结果发现:在构成粘着胶带的基材的一个面涂布脱模剂,并将该涂布面的摩擦系数调节至特定范围是非常有效的,从而完成了本发明。
即,本发明为一种电池用粘着胶带,其为具有基材以及设置于该基材的一个面的粘着剂层的电池用粘着胶带,其特征在于,在该基材的与设有该粘着剂层的面相反一侧的面涂布有脱模剂,涂布有该脱模剂的面依据JIS K 7125:1999得到的静摩擦系数和动摩擦系数的最大值为0.6以下。
发明效果
根据本发明,能够提供一种通过改善电池部件插入性从而能够提高电池的生产率的电池用粘着胶带。具体地说,例如即使在将电极组插入电池壳时在电极组的表面或电池壳内部使用了粘着胶带,由于该粘着胶带的基材表面的摩擦系数低,因此也能够将电极组非常顺利地插入电池壳中。因此,本发明的粘着胶带在提高小型化或薄型化的电池的生产率方面非常有用。
具体实施方式
[基材]
本发明的粘着胶带的基材种类没有特别限制,可以使用已知能够用于粘着胶带的各种基材。特别优选为塑料膜。作为具体例子,可列举聚乙烯膜、聚丙烯膜等聚烯烃膜、聚对苯二甲酸乙二醇酯膜、聚对苯二甲酸丁二醇酯膜、聚苯硫醚膜、聚酰亚胺膜、聚酰胺膜。另外也可以根据需要对基材实施电晕处理、等离子体处理、火焰处理、锚固剂处理等处理。其中,从具有适于电池用途的耐热性、耐药品性的方面出发,优选为聚烯烃膜、聚酰亚胺膜。
基材的厚度优选为4~200μm,更优选为6~100μm,特别优选为15~60μm。
[脱模剂]
在本发明的粘着胶带的基材的一面(与设有粘着剂层的面相反一侧的面)涂布有脱模剂。脱模剂的种类没有特别限制,可以使用公知的各种脱模剂。作为脱模剂,优选长链烷基系、有机硅系脱模剂,特别优选长链烷基系。
作为长链烷基系脱模剂,例如可以使用具有长链烷基的丙烯酸烷基酯的聚合物、具有长链烷基的丙烯酸烷基酯与其他乙烯基单体的共聚物、使聚乙烯醇与长链烷基异氰酸酯反应而得到的反应物。长链烷基的碳原子数优选为12以上,更优选为12~22。作为长链烷基系脱模剂,也可以使用市售品。作为市售品的具体例子,可列举作为以长链烷基侧基聚合物(pendant polymer)作为主成分的有机溶剂可溶型长链烷基系脱模剂的、LionSpecialty Chemicals公司制的“PEELOIL(注册商标)1010”。长链烷基系脱模剂的干式涂布量(涂布干燥后的固体成分量)优选为0.001~0.5g/m2,更优选为0.02~0.45g/m2,特别优选为0.03~0.40g/m2。
作为有机硅系脱模剂,例如可以使用加成反应型、缩合反应型、阳离子聚合型、自由基聚合型的有机硅系脱模剂。其中,优选为包含通过加成聚合进行固化的脱模剂成分的加成反应型有机硅系脱模剂。作为有机硅系脱模剂,也可以使用市售品。作为市售品的具体例子,可列举以能够通过烯基与SiH基的加成聚合而固化的脱模剂成分作为主成分的作为加成反应型有机硅系脱模剂的信越化学株式会社制的商品名“KS-847T”。有机硅系脱模剂的干式涂布量(涂布干燥后的固体成分量)优选为0.1~0.4g/m2,更优选为0.1~0.3g/m2,特别优选为0.1~0.25g/m2。
在本发明中,基材的涂布有该脱模剂的面依据JIS K 7125得到的静摩擦系数和动摩擦系数的最大值为0.6以下,优选为0.5以下,更优选为0.4以下,特别优选为0.3以下。摩擦系数的测定方法的具体条件记载于实施例一栏中。在本发明中,由于将静摩擦系数和动摩擦系数的最大值设为这样的特定范围内,因此能够显著改善电池部件插入性。
在以往的粘着胶带中,也存在将脱模剂涂布于基材的一面的粘着胶带。但是,在这种情况下脱模剂涂布的目的在于使卷绕状态的粘着胶带容易反卷。即,如果处于卷绕状态的下侧粘着胶带的基材与上侧粘着胶带的粘着剂层之间被牢固地粘接则难以反卷,因此通过在基材的上侧涂布脱模剂从而缓和了该粘接力。另一方面,本发明的目的不是提高反卷性,而是改善电池部件插入性。而且,以往的用于提高粘着胶带的反卷性的产品设计与本发明的用于改善电池部件插入性的产品设计不同。
例如,为了提高反卷性只要大量地涂布脱模剂即可,但如果只是大量地涂布脱模剂,则静摩擦系数和动摩擦系数的最大值未必降低。实际上,在后述的实施例中,也存在如下种类的脱模剂,即:如果大量地涂布则静摩擦系数和动摩擦系数的最大值反而会变高。而且,静摩擦系数和动摩擦系数的最大值不仅受到脱模剂的量、种类的影响,还受到基材本身本来具有的摩擦系数(涂布脱模剂前的基材表面的摩擦系数)的影响。因此,在本发明中,为了将静摩擦系数和动摩擦系数的最大值设为上述特定的范围内,适当选择脱模剂和基材的种类,且适当调节脱模剂的量。基材本身(涂布脱模剂前的基材)的影响静摩擦系数和动摩擦系数的最大值优选为1.5以下,更优选为1.0以下。
[粘着剂层]
作为构成本发明的粘着胶带的粘着剂层的粘着剂,例如可以使用橡胶系粘着剂、丙烯酸系粘着剂、有机硅系粘着剂。它们可以单独使用或混合两种以上来使用。
橡胶系粘着剂的种类没有特别限制,可以使用以橡胶成分作为主成分的各种公知的橡胶系粘着剂。作为橡胶成分的具体例子,可列举丁基橡胶、聚异丁烯橡胶、异戊二烯橡胶、苯乙烯-异丁烯-苯乙烯三嵌段共聚物、苯乙烯-异戊二烯嵌段共聚物、苯乙烯-丁二烯橡胶、苯乙烯异戊二烯-苯乙烯嵌段共聚物、苯乙烯-丁二烯-苯乙烯嵌段共聚物、苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物、苯乙烯-乙烯-丙烯-苯乙烯嵌段共聚物、苯乙烯-乙烯-丙烯嵌段共聚物橡胶等合成橡胶;和天然橡胶。也可以并用两种以上的橡胶成分。特别是从耐热性、耐药品性、耐候性、绝缘性等特性方面出发,优选合成橡胶,更优选丁基橡胶、聚异丁烯橡胶、或它们的混合物。丁基橡胶一般是指以异丁烯和1~3质量%的异戊二烯的共聚物作为主成分的橡胶。
在粘着剂层中使用橡胶系粘着剂的情况下,优选进一步配合饱和烃树脂。饱和烃树脂为不具有不饱和键的烃树脂,是用于提高粘着剂层的粘着性的成分。由于饱和烃树脂为仅由饱和烃构成的树脂,因此在将粘着胶带用于例如二次电池内的浸渍于电解液的部位或有可能与电解液接触的部位的情况下,即使在反复充电/放电时的高电压/高能量下也难以发生分解反应,具有优异的稳定性。
饱和烃树脂的种类没有特别限制,例如可以使用作为增粘剂已知的各种脂环族系或脂肪族系的饱和烃树脂。也可以并用两种以上的饱和烃树脂。特别优选脂环族系的饱和烃树脂,更优选通过氢化处理除去了不饱和键的烃树脂。作为饱和烃树脂的市售品,有氢化石油树脂。氢化石油树脂是指通过对石油树脂(例如芳香族系石油树脂、脂肪族系石油树脂、脂环族系成分与芳香族成分的共聚石油树脂等)进行氢化处理而得到的树脂。其中,优选为对芳香族系石油树脂进行氢化处理而得到的氢化石油树脂(脂环族系的饱和烃树脂)。优选的氢化石油树脂也可以作为市售品(例如荒川化学工业(株)制,ARCON(注册商标)P-100)获得。饱和烃树脂的含量相对于100质量份粘着剂成分优选为0.01~100质量份,更优选为0.01~80质量份,特别优选为0.01~50质量份。如果饱和烃树脂的含量多,则粘着性进一步提高。
丙烯酸系粘着剂的种类没有特别限制,可以使用以丙烯酸系共聚物作为主成分的各种公知的丙烯酸系粘着剂。作为丙烯酸系共聚物,例如可以使用使(甲基)丙烯酸酯、含羧基的单体和根据需要的其他单体共聚而得到的丙烯酸系共聚物。作为(甲基)丙烯酸酯的具体例子,可列举(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸正丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸异丁酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸壬酯、(甲基)丙烯酸异壬酯、(甲基)丙烯酸月桂酯。作为含羧基的单体的具体例子,可列举(甲基)丙烯酸、衣康酸、巴豆酸、马来酸(酐)、富马酸、2-羧基-1-丁烯、2-羧基-1-戊烯、2-羧基-1-己烯、2-羧基-1-庚烯、乙酸乙烯酯。作为其他单体的具体例子,可列举(甲基)丙烯酸2-羟基乙酯、(甲基)丙烯酸3-羟基丙酯、(甲基)丙烯酸4-羟基丁酯等含羟基的单体、丙烯腈、苯乙烯、2-羟甲基乙基丙烯酰胺。
作为丙烯酸系共聚物,特别优选为包含具有碳原子数为4~12的烷基的(甲基)丙烯酸烷基酯(A1)、含羧基的单体(A2)、含羟基的单体(A3)、和根据需要具有碳原子数为1~3的烷基的(甲基)丙烯酸烷基酯(A4)作为构成成分的具有羟基和羧基的丙烯酸系聚合物(A)。
作为具有碳原子数为4~12的烷基的(甲基)丙烯酸烷基酯(A1)的具体例子,可列举(甲基)丙烯酸正丁酯、(甲基)丙烯酸异丁酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸异壬酯、(甲基)丙烯酸月桂酯。(甲基)丙烯酸烷基酯(A1)的含量在丙烯酸系共聚物(A)的构成成分(单体单元)100质量%中优选为70质量%以上,更优选为80质量%以上,特别优选为90质量%以上。
作为含羧基的单体(A2)的具体例子,可列举(甲基)丙烯酸、衣康酸、巴豆酸、马来酸(酐)、富马酸、2-羧基-1-丁烯、2-羧基-1-戊烯、2-羧基-1-己烯、2-羧基-1-庚烯。含羧基的单体(A2)的含量在丙烯酸系共聚物(A)的构成成分(单体单元)100质量%中优选为0.5~10质量%,更优选为1~7质量%,特别优选为1~5质量%。
作为含羟基的单体(A3)的具体例子,可列举(甲基)丙烯酸2-羟基乙酯、(甲基)丙烯酸3-羟基丙酯、(甲基)丙烯酸4-羟基丁酯。含羟基的单体(A3)的含量在丙烯酸系共聚物(A)的构成成分(单体单元)100质量%中优选为0.05~10质量%,更优选为0.07~7质量%,特别优选为0.1~5质量%。
作为具有碳原子数为1~3的烷基的(甲基)丙烯酸烷基酯(A4)的具体例子,可列举(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯。其中,优选(甲基)丙烯酸甲酯。(甲基)丙烯酸烷基酯(A4)的含量在丙烯酸系共聚物(A)的构成成分(单体单元)100质量%中优选为0~20质量%,更优选为0~10质量%,特别优选为0~5质量%。
丙烯酸系共聚物(A)也可以包含除成分(A1)~(A4)以外的单体作为构成成分。
在丙烯酸系粘着剂中通常使用与丙烯酸系共聚物的官能团具有反应性的交联剂。作为交联剂,例如可以使用异氰酸酯化合物、酸酐、胺化合物、环氧化合物、金属螯合物类、氮丙啶化合物、三聚氰胺化合物。交联剂的添加量相对于丙烯酸系共聚物100质量份通常为0.01~5质量份,优选为0.05~3质量份。
在丙烯酸系粘着剂中也可以根据需要添加松香系、萜烯系、石油系、苯并呋喃-茚系、纯单体系、酚醛系、二甲苯系等增粘剂树脂;石蜡系操作油等矿物油、聚酯系增塑剂、包含植物性油等的软化剂、芳香族仲胺系、单酚系、双酚系、多酚系、苯并咪唑系、亚磷酸系等抗老化剂。另外,还可以配合如上所述的饱和烃树脂。
有机硅系粘着剂的种类没有特别限制,可以使用以有机硅成分作为主成分的各种公知的有机硅系粘着剂。作为有机硅成分,例如可列举以有机聚硅氧烷作为主成分的有机硅橡胶和有机硅树脂。只要在这样的有机硅成分中添加铂催化剂等催化剂、硅氧烷系交联剂、过氧化物系交联剂等交联剂进行交联/聚合即可。另外,也可以配合如上所述的饱和烃树脂。
以上说明的各粘着剂中也可以进一步根据需要包含其他成分。作为具体例子,可列举甲苯等溶剂;抗氧化剂、紫外线吸收剂、光稳定剂、抗静电剂等添加剂;炭黑、氧化钙、氧化镁、二氧化硅、氧化锌、氧化钛等填充剂或颜料。
粘着剂层例如可以通过在基材上涂布粘着剂,并通过加热发生交联反应从而形成。粘着剂层的厚度优选为1~50μm,更优选为2~40μm,特别优选为3~30μm。
也可以在基材与粘着剂层之间设置底涂剂层。作为底涂剂,例如可以使用包含通过酸改性导入了极性基团的聚合物和/或酸成分的底涂剂。作为具体例子,可列举使用含羧基的单体(例如,丙烯酸、甲基丙烯酸等不饱和一元羧酸;马来酸单甲酯等不饱和二元羧酸单酯)、或者含酸酐基的单体(例如,马来酸酐)通过接枝改性导入了极性基团的聚合物。经改性的聚合物的种类没有特别限制,但特别优选为聚丙烯系聚合物、聚乙烯系聚合物等聚烯烃系聚合物。作为底涂剂层中使用的酸成分的具体例子,可列举有机磺酸、羧酸等有机酸;硫酸、盐酸、磷酸等无机酸。其中,优选为酸改性聚烯烃系聚合物,更优选为酸改性聚丙烯系聚合物。底涂剂层的厚度优选为0.01~5μm,更优选为0.1~3μm,特别优选为0.2~2μm。
[电池用粘着胶带]
本发明的粘着胶带具有基材以及设置于基材的一个面的粘着剂层。而且,在基材的与设有粘着剂层的面相反一侧的面涂布有脱模剂,涂布有脱模剂的面依据JIS K7125得到的静摩擦系数和动摩擦系数的最大值为0.6以下。
本发明的粘着胶带为电池用粘着胶带。例如在二次电池(铅蓄电池、镍镉电池、镍氢电池、锂离子电池等)的电池制造工序中,可以用于芯固定、电极取出口的绝缘、终端固定、绝缘间隔物等各种目的。而且,本发明的粘着胶带由于静摩擦系数和动摩擦系数的最大值处于特定的范围内,因此电池部件插入性优异。例如,即使在将电极组插入电池壳中时在电极组的表面或电池壳内部使用了粘着胶带,由于该粘着胶带的基材表面的摩擦系数低,因此也能够将电极组非常顺利地插入电池壳中。因此,本发明的粘着胶带在提高小型化或薄型化的电池的生产率方面非常有用。
本发明的粘着胶带的粘着剂层优选层叠于距基材两侧端缘部0.5mm以上的内侧。根据这样的内侧层叠形态,能够防止粘着剂的渗出,成为非常适于电池用途的粘着胶带。
一般而言,粘着胶带以卷绕体的形式进行运输、保管。而且,处于卷绕状态的下侧粘着胶带的基材面的脱模剂转移至上侧的粘着胶带的粘着剂层,粘着胶带的粘着力有时会降低。因此,本发明的粘着胶带通过以下方法测定的残留粘接率优选为70~150%,更优选为75~130%,特别优选为80~120%,最优选为90~110%。
(残留粘接率)
使粘着胶带(1)的涂布有脱模剂的面与相同的粘着胶带(2)的粘着剂层侧贴合,在23℃老化20小时,然后剥离。然后,依据JIS Z 0237:2000测定粘着胶带(2)的对SUS板粘着力(a)和在不老化而进行剥离时粘着胶带(2)的对SUS粘着力(b),通过下式算出残留粘接率。
残留粘接率(%)=(a/b)×100%
本发明的粘着胶带的制造方法没有特别限制。例如,首先在基材的一面涂布脱模剂。然后,在另一面涂布粘着剂,在干燥等工序中通过加热除去溶剂而形成粘着剂层即可。也可以进一步根据需要在粘着剂层上贴合由涂布有剥离剂的PET膜等构成的脱模膜。
脱模剂、粘着剂的涂布法没有特别限制,例如可以使用采用了辊涂机、模涂机、唇涂机、迈耶棒涂布机、凹版涂布机等的方法。脱模剂、粘着剂的干燥法也没有特别限制,例如可以使用热风干燥法。
实施例
以下,通过实施例进一步详细地说明本发明。但是,本发明不限于这些实施例。
<实施例1~6>
通过以下方法测定用作基材的厚度20μm的双轴拉伸聚丙烯膜[东丽(株)制,TORAYFAN(注册商标)](OPP膜,脱模剂涂布前)的静摩擦系数和动摩擦系数的最大值,结果其最大值为0.43。
(静摩擦系数和动摩擦系数的最大值的测定)
依据JIS K7125测定静摩擦系数和动摩擦系数的最大值。具体地说,使用摩擦系数测定机((株)东洋精机制作所公司制),在滑片的重量200g、接触面积6.3cm×6.3cm、拉伸速度100mm/分钟的条件下测定静摩擦系数和动摩擦系数,将其中最高的值设为“最大值”。
在该OPP膜的一个面按照干式涂布量(涂布干燥后的固体成分量)为表1记载的量的方式涂布作为脱模剂的长链烷基系脱模剂(Lion Specialty Chemicals株式会社制,PEELOIL(注册商标)1010)并干燥。然后,通过相同的方法测定基材的涂布有脱模剂的面的静摩擦系数和动摩擦系数的最大值。将结果示于表1中。
将以上那样在一面实施了脱模剂处理的该OPP膜用作基材,在另一个面涂布包含100质量份丁基橡胶(埃克森化学(株)制,商品名Butyl 365)和40质量份氢化石油树脂(脂环族系的饱和烃树脂)(荒川化学工业(株)制,ARKON(注册商标)P-100)作为主成分的橡胶系粘着剂,并干燥,形成厚度5μm的粘着剂层,得到橡胶系粘着胶带。
另外,代替橡胶系粘着剂而使用在包含丙烯酸系聚合物作为主成分的丙烯酸系粘着剂100质量份中添加了1质量份异氰酸酯系交联剂(日本聚氨酯(株)制,CORONATE(注册商标)L)的粘着剂组合物,该丙烯酸系聚合物包含(甲基)丙烯酸2-乙基己酯60质量%、丙烯酸正丁酯36.4质量%、丙烯酸3.5质量%、丙烯酸2-羟基乙酯0.1质量%作为构成成分,除此以外,与上述同样地操作,形成厚度10μm的粘着剂层,得到丙烯酸系粘着胶带。
<实施例7~8和比较例1>
作为脱模剂,使用有机硅系脱模剂(信越化学株式会社制,KS-847T),按照干式涂布量为表2记载的量的方式涂布,除此以外,与实施例1~6同样地操作,制作橡胶系粘着胶带和丙烯酸系粘着胶带。
<实施例9~10和比较例2~3>
作为基材,使用厚度25μm的聚酰亚胺膜[东丽-杜邦(株)制,KAPTON(注册商标)100H](PI膜,摩擦系数的最大值=1.45),按照干式涂布量为表3记载的量的方式涂布作为脱模剂的长链烷基系脱模剂,除此以外,与实施例1~6同样地操作,制作橡胶系粘着胶带和丙烯酸系粘着胶带。
<实施例11~12和比较例4>
作为脱模剂,使用有机硅系脱模剂(信越化学株式会社制,KS-847T),按照干式涂布量为表4记载的量的方式涂布,除此以外,与实施例9~10同样地操作,制作橡胶系粘着胶带和丙烯酸系粘着胶带。
<实施例13~17>
作为基材,使用厚度25μm的聚对苯二甲酸乙二醇酯膜[东丽(株)制,LUMIRROR(注册商标)](PET膜,摩擦系数的最大值=0.81),按照干式涂布量为表5记载的量的方式涂布作为脱模剂的长链烷基系脱模剂,除此以外,与实施例1~6同样地操作,制作橡胶系粘着胶带和丙烯酸系粘着胶带。
评价以上的实施例1~13和比较例14的各粘着胶带的电池部件插入性。另外,对于实施例1~8和比较例1的各粘着胶带还测定了残留粘接率。其评价/测定方法如下所述。将结果示于表1~5中。
(残留粘接率)
使粘着胶带(1)的涂布有脱模剂的面与相同的粘着胶带(2)的粘着剂层侧贴合,在23℃老化20小时,然后剥离。然后,依据JIS Z 0237:2000测定粘着胶带(2)的对SUS板粘着力(a)和在不老化而进行剥离时粘着胶带(2)的对SUS粘着力(b),通过下式算出残留粘接率。
残留粘接率(%)=(a/b)×100%
(电池部件插入性)
用粘着胶带使小型二次电池用的卷绕电极组停止卷绕,按照以下基准评价将其插入至电池壳时的插入性。
“○”:能够顺利地插入。
“△”:能够勉强顺利地插入。
“×”:不能顺利地插入。
[表1]
[表2]
[表3]
[表4]
[表5]
<评价结果>
如表1~5所示,实施例1~17的粘着胶带的电池部件插入性优异。另一方面,比较例1~4的粘着胶带的电池部件插入性差。
使用了长链烷基系脱模剂的实施例1~6、9~10和16、比较例2~3中,脱模剂的涂布量增加时,摩擦系数的最大值降低。另一方面,使用了有机硅系脱模剂的实施例7~8和11~12、比较例1和4,脱模剂的涂布量增加时,摩擦系数的最大值反而变高。
使用了长链烷基系脱模剂的实施例1~6中,脱模剂的涂布量增加时,丙烯酸系粘着剂中的残留粘接率变低。这可认为是因为粘着胶带(1)的基材上的长链烷基系脱模剂的一部分会转移至粘着胶带(2)的粘着剂层。另一方面,使用了有机硅系脱模剂的实施例7~8、比较例1中,脱模剂的涂布量增加时,残留粘接率反而变高。这可认为是因为虽然有机硅系脱模剂的一部分转移至粘着剂层,但有机硅系脱模剂本身具有粘着性。另外,在实施例1~8和比较例1的任一个中,使用了橡胶系粘着剂的粘着胶带与使用了丙烯酸系粘着剂的粘着胶带相比残留粘接率高。
产业上的可利用性
本发明的电池用粘着胶带由于电池部件插入性优异,因此例如在卷绕型电池的制造中,通过用于使卷绕电极组停止卷绕,从而能够将电极组容易地插入电池壳中。因此,对于电池、特别是小型或薄型电池的生产率提高非常有用。
Claims (10)
1.一种电池用粘着胶带,其为具有基材以及设置于该基材的一个面的粘着剂层的电池用粘着胶带,其特征在于,在该基材的与设有该粘着剂层的面相反一侧的面涂布有脱模剂,涂布有该脱模剂的面依据JIS K 7125:1999得到的静摩擦系数和动摩擦系数的最大值为0.6以下,
该脱模剂为长链烷基系脱模剂或有机硅系脱模剂,
该长链烷基系脱模剂的干式涂布量为0.001~0.5g/m2,
该有机硅系脱模剂的干式涂布量为0.1~0.25g/m2。
2.根据权利要求1所述的电池用粘着胶带,构成粘着剂层的粘着剂组合物含有橡胶系粘着剂、丙烯酸系粘着剂或有机硅系粘着剂。
3.根据权利要求2所述的电池用粘着胶带,橡胶系粘着剂的橡胶成分为聚异丁烯橡胶和/或丁基橡胶。
4.根据权利要求2所述的电池用粘着胶带,粘着剂组合物包含橡胶系粘着剂和饱和烃树脂。
5.根据权利要求4所述的电池用粘着胶带,饱和烃树脂为氢化石油树脂。
6.根据权利要求1所述的电池用粘着胶带,粘着剂层的厚度为1~50μm。
7.根据权利要求1所述的电池用粘着胶带,基材为塑料膜。
8.根据权利要求1所述的电池用粘着胶带,基材的厚度为4~200μm。
9.根据权利要求1所述的电池用粘着胶带,粘着剂层被层叠于距基材两侧端缘部0.5mm以上的内侧。
10.根据权利要求1所述的电池用粘着胶带,通过以下方法测定的残留粘接率为70~150%,
残留粘接率:
使粘着胶带1的涂布有脱模剂的面与相同的粘着胶带2的粘着剂层侧贴合,在23℃老化20小时,然后剥离,然后,依据JIS Z 0237:2000测定粘着胶带2的对SUS板粘着力a和在不老化而进行剥离时粘着胶带2的对SUS粘着力b,通过下式算出残留粘接率,
残留粘接率(%)=(a/b)×100%。
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