WO2018090359A1 - 一种加热膨胀规律型卷曲的压敏胶粘片及其制作方法 - Google Patents

一种加热膨胀规律型卷曲的压敏胶粘片及其制作方法 Download PDF

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WO2018090359A1
WO2018090359A1 PCT/CN2016/106560 CN2016106560W WO2018090359A1 WO 2018090359 A1 WO2018090359 A1 WO 2018090359A1 CN 2016106560 W CN2016106560 W CN 2016106560W WO 2018090359 A1 WO2018090359 A1 WO 2018090359A1
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film
adhesive sheet
heat
sensitive adhesive
die
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PCT/CN2016/106560
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English (en)
French (fr)
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姚海瑞
覃国飞
陆金亮
王宜金
尹嘉菲
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东莞市澳中电子材料有限公司
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Priority to PCT/CN2016/106560 priority Critical patent/WO2018090359A1/zh
Publication of WO2018090359A1 publication Critical patent/WO2018090359A1/zh

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    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • 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
    • C09J201/00—Adhesives based on unspecified macromolecular compounds

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  • the present invention relates to an adhesive sheet, in particular to a pressure-sensitive adhesive sheet which is heated and expanded in a regular shape and a method for producing the same.
  • the most direct way to solve the above problems is to improve the coating efficiency of the positive and negative electrodes, reduce the position of the pole piece welding, and increase the coating amount of the positive and negative electrodes.
  • the application of the present invention is directed to the above problems existing in the prior art, and provides a positive battery for a lithium battery.
  • the heat-expanding type crimped pressure-sensitive adhesive sheet which reserves the position of the pole piece in the coating process of the negative electrode slurry and the manufacturing method thereof, provide a more precise die-cutting under the requirement of ensuring the corresponding baking expansion temperature
  • the method and the design; the heat-expanding regular type crimped pressure-sensitive adhesive sheet, after heating and expanding, the film can be more regularly curled, the direction is the same, the curling degree and the expansion multiple can completely push up the lithium battery pole piece coated slurry.
  • the adhesive sheet after expansion needs to be slightly sticky and cannot be blown away by the wind of the oven duct, resulting in contamination of the pole piece slurry.
  • the invention provides a heat-expanding type curl-type pressure-sensitive adhesive sheet for preserving a welding position of a pole piece in a coating process of a positive and negative electrode of a lithium battery, which provides a precise die-cut design; The physical effects achieved after die-cutting change and improve the performance of the tape itself, such as the curl and regularity of the tape.
  • the heat-expanding type crimped pressure-sensitive adhesive sheet according to the present application has been filed by the present applicant, and the heat-expanding type crimped pressure-sensitive adhesive sheet is made of the following mass percentage components. to make:
  • the heat-expandable polymer material is 15.5% to 33.5%;
  • the method for manufacturing the above-mentioned heat-expanding type crimped pressure-sensitive adhesive sheet comprises the following steps:
  • the pressure sensitive adhesive, the heat-sensitive expansion polymer material, the crosslinking agent, the inorganic filler, the organic solvent are mixed according to the above ratio, and stirred at a speed of 600 to 1500 r / min under a high speed mixer for 15 to 40 minutes to obtain an adhesive;
  • the oven or knife coater oven temperature is set between 60 ⁇ 120 ° C;
  • the dried adhesive is applied to the release surface of the 16-50 um PET release film at the bonding device of the coater, and other release films such as OPP and PP;
  • the film is placed at a temperature of 30 to 70 ° C for 24-48 hours to obtain a heat-expandable and loss-sensitive pressure-sensitive adhesive tape.
  • the heat-expanding type crimping pressure-sensitive adhesive sheet of the invention is designed as follows: the film and the release film coil are designed as follows: the long side or the short side of the adhesive sheet is parallel with the wide side of the release film, and the release film is The width specification is larger than the vertical side of the adhesive sheet, and the distance between the two sides of the adhesive sheet is ⁇ 1mm; the size of the release film is as follows: length: 100-500m, width: 20-100mm; size of the adhesive sheet: length: 10 ⁇ 50mm , width: 10 ⁇ 50mm; film - film spacing ⁇ 1mm, and the above dimensional specifications deviation ⁇ ⁇ 0.2mm.
  • the heat-expanding regular type pressure-sensitive adhesive sheet of the invention is designed as follows: the film shape is a rectangular shape containing a knife crease, the film length is 10 to 50 mm, the width is 10 to 50 mm, and the knife crease
  • the pressure-sensitive adhesive sheet with heating and expansion type curling according to the application of the invention has the same curling rule and direction after the film is heated and expanded at 90-180 ° C: the two long sides are curled in a roll shape along the short side direction, and the curl degree is greater than 50% of the short side size.
  • the present invention provides the above-mentioned heat-expanding type crimped pressure-sensitive adhesive sheet, and a manufacturing method thereof, such as Next steps:
  • the base film comprises a PET film, a PP film or a PI film.
  • the transition protective film is a low-viscosity protective film for temporary traction fixation, which is commercially available.
  • the precision is ⁇ 0.1 mm.
  • the die-cutting punching takes 100-400 punches per minute.
  • step 3 three automatic winding sticks are placed in the back section of the die-cutting die, and the die-cut products, the die-cutting waste and the transition protective film are respectively wound up.
  • the invention discloses a heat-expanding and regular-type crimped pressure-sensitive adhesive sheet, wherein the die-cutting method comprises a bonding base film, a laminated transition protective film, punching, removing waste, and winding continuous synchronous operation, and has high precision. There is no pattern of the release film being punctured, lacking film and clearing the edge; the die-cut graphic design of the heat-expanding and loss-sensitive pressure-sensitive adhesive tape provided by the invention has a rectangular shape and contains creases of length and length.
  • the long edge of the tape is curled inward along the short side, and the part of the expansion stress is released at the crease of the knife, which makes the tape curl direction and regularity better, and better adjusts the residual viscosity during the expansion of the tape to ensure the residual viscosity.
  • the appearance of the slurry is damaged due to irregular curl during the coating and baking of the lithium battery slurry.
  • FIG. 1 is a view showing a die cutting method for a heat-expanding type crimped pressure-sensitive adhesive sheet according to the present invention.
  • FIG. 2 is a diagram showing a roll-shaped diagram of a heat-expanding type crimped pressure-sensitive adhesive sheet according to the present application
  • FIG. 3 is a diagram showing a die-cut specification design of a heat-expanding type crimped pressure-sensitive adhesive sheet according to the present application
  • FIG. 4 is a schematic view showing the curling condition of the heat-expanding type crimped pressure-sensitive adhesive sheet without knife crease die cutting after high-temperature baking foaming according to the application of the present invention
  • Fig. 5 is a schematic view showing the heat-expanding type crimped pressure-sensitive adhesive sheet according to the present invention in accordance with the graphic design of the present invention.
  • a process flow chart of a die-cutting method for a heat-expanding type crimped pressure-sensitive adhesive sheet according to the present application includes the following steps:
  • No. G1 the first tension fit, so that the adhesive tape is attached to the release film;
  • No. C die-cut transition protective film coil (adhered to the back side of the release film, temporarily fixed to prevent the release film from being punched and damaged);
  • No. G2 the second bonding, so that the back surface of the release film is bonded to the transition protection film;
  • No. G3 the third pressing roller, fixing the film and the release film when the waste is peeled off;
  • No. H Die-cut film winding (rolling the release film and punched film on the take-up roll).
  • FIG. 2 it is a roll-up diagram of a heat-expanding type crimped pressure-sensitive adhesive sheet according to the application of the present invention, wherein:
  • FIG. 3 is a schematic diagram of a die-cutting specification design of a heat-expanding type crimped pressure-sensitive adhesive sheet according to the present application:
  • 6, 7 film die cutting knife mark width, 6 ⁇ 7 and 6 ⁇ 3 (film width), length 1 ⁇ 45mm;
  • the length difference between the left and right sides of the die-cut length is ⁇ 0mm;
  • Fig. 4 is a heat-expanding type of crimped pressure-sensitive adhesive sheet with a cutting specification, without knife crease die-cutting, and curling after high-temperature baking and foaming: the film has four sides curling direction and irregularity.
  • FIG. 5 is a die-cutting heating test for the heat-expanding type of crimped pressure-sensitive adhesive sheet according to the present invention.
  • the opening of the knife crease is opened, a part of the expansion stress is released to the left and right sides, and the curling rate is effectively controlled.
  • Curl degree due to the difference in the length of the long and short sides of the rectangular figure, the deformation of the long side is short The edge deformation is large and the force is small, so the long side is curled inward along the short side direction, and the curling regularity and the directionality are consistent after the tape is expanded.
  • the pressure-expandable adhesive sheet of the heat-expanding type curled in the application of the present invention has the same curling direction and regularity after the foaming of the tape by designing precision die-cut forming.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Adhesive Tapes (AREA)

Abstract

本发明提供了一种加热膨胀规律型卷曲的压敏胶粘片，胶粘片的长边或者短边与离型膜的宽边相平行，胶片为矩形状且含有长短相间的折痕设计；胶片在90～180℃加热膨胀过程中两长边沿短边向内卷曲，刀折痕处释放了部分膨胀应力，使得胶带卷曲方向性及规律性极好呈卷筒状，且卷曲度大于短边尺寸的50％，更好的调节胶带膨胀过程中的残余粘性，确保不会造成在锂电池正负极浆料涂布烘烤时的卷曲不规律对浆料外观造成损伤。其模切包括贴合底膜、贴合过渡保护膜、冲切、除废料、收卷同步连续作业，精密度高，不存在离型膜被打穿、缺胶片及清边不齐情况。

Description

一种加热膨胀规律型卷曲的压敏胶粘片及其制作方法 技术领域
本发明申请涉及一种胶粘片，特别是一种加热膨胀规律型卷曲的压敏胶粘片及其制作方法。
背景技术
目前在电池制造中需要涂布正负极浆料，但涂布过程中为了预留极片焊接的空位采取了间歇式的涂布方法(也就是在铜箔或者铝箔上涂布一段浆料后要留出一段空白后再涂后一段)；这样的涂布方式大大降低了电池的生产效率，同时由于预留较大的空白位置焊接极片，使得电池整体的能量密度无法提高，且占用了较大的空间体积。
随着手机电池及动力汽车电池行业的飞速发展，对电池的能量密度、安全性、精巧型以及生产效率要求越来越高。而能解决以上问题最直接方法就是通过提高正负极浆料的涂布效率，缩小极片焊接预留位置，提高正负极浆料的涂布量。
现有技术中提到了一种易因拉伸变形保护膜的模切方法，涉及到的保护膜由于在收卷或者牵引过程中张力的作用导致胶带拉伸变形，其模切方法中一次贴合、二次贴合、冲切、收废、收卷流程需要在不同工艺下分段实施，无针对保护膜的模切图形设计。
从目前胶粘带的模切方法技术来看，模切工艺的连续性差，需要分段多步进行；现有技术中的一些胶带模切，对其模切的图形设计、模切的精确度以及模切后的应用效果不明确，且应用领域较为低端。
发明内容
本发明申请即是针对目前技术中存在的上述问题，提供一款用于锂电池正 负极浆料涂布过程中预留极片焊接位置的加热膨胀规律型卷曲的压敏胶粘片及其制作方法，在确保到达其相应烘烤膨胀温度要求下，提供一种较精密的模切方法及设计；所述的加热膨胀规律型卷曲的压敏胶粘片，加热膨胀后胶片四周能够较规律卷曲，方向一致，卷曲度及膨胀倍数能够完全顶起锂电池极片涂布的浆料，并且要求浆料四周不能被破坏；同时膨胀之后的胶粘片还需要有轻微粘性，不能被烘箱风道的风吹散，导致极片浆料的污染。
本发明申请提供了一款用于锂电池正负极浆料涂布过程中预留极片焊接位置的加热膨胀规律型卷曲的压敏胶粘片，提供了一种精密的模切设计；通过模切后达到的物理作用改变及完善胶带自身性能，如：胶带的卷曲度、规律性。
本发明申请所涉及的加热膨胀规律型卷曲的压敏胶粘片已经由本申请人申请了相关专利，所述的加热膨胀规律型卷曲的压敏胶粘片，由如下质量百分含量的成分制成：
1)压敏胶粘剂40.4％～66％；
2)热敏膨胀型高分子材料15.5％～33.5％；
3)交联剂0.8％～1.6％；
4)无机填料2.7％～4.5％；
5)有机溶剂15％～20％。
上述加热膨胀规律型卷曲的压敏胶粘片的制作方法，包括如下步骤：
A、将压敏胶粘剂、热敏膨胀型高分子材料、交联剂、无机填料、有机溶剂按照上述比例混合，并在高速搅拌机下以600～1500r/min的速度搅拌15～40min，得到胶粘剂；
B、将挤出式或刮刀式涂布机烘箱温度设置在60～120℃之间；
C、将搅拌均匀的胶粘剂用涂布机涂布在基膜电晕面，涂布速度为5～30m/min，涂布厚度15～70um，经过烘箱干燥，烘烤时间为1～3min，温度为60-120℃；
D、将干燥好的胶粘剂在涂布机的贴合装置处贴合至16～50um的PET离型膜的离型面，其他的离型膜如OPP、PP；
E、将贴合好的胶粘带进行收卷；
F、将收好的胶卷放置在30～70℃的温度下24-48小时即得加热膨胀失粘型压敏胶粘带。
本发明申请所述加热膨胀规律型卷曲的压敏胶粘片，胶片与离型膜卷料规格设计如下：胶粘片的长边或者短边与离型膜的宽边相平行，离型膜宽度规格大于与胶粘片的垂直边，且与胶粘片两边距≥1mm；离型膜尺寸如下：长：100～500m，宽：20～100mm；胶粘片尺寸为：长：10～50mm，宽：10～50mm；胶片与胶片之间间距≥1mm，且以上尺寸规格偏差＜±0.2mm。
本发明申请所述加热膨胀规律型卷曲的压敏胶粘片，胶片的规格设计如下：胶片形状为含有刀折痕的矩形状，胶片长：10～50mm，宽：10～50mm，刀折痕为长短相间相互平行或者同一规格长度相互平行，折痕打穿胶片且不能打穿离型膜，折痕的长：2～45mm，刀痕与刀痕间距：1～20mm；胶片倒角R＝0-5mm；且以上尺寸规格偏差＜±0.2mm。
本发明申请所述加热膨胀规律型卷曲的压敏胶粘片，胶片在90～180℃加热膨胀后卷曲规律及方向一致：两长边沿着短边方向内卷曲呈卷筒状，且卷曲度大于短边尺寸的50％。
本发明提供上述加热膨胀规律型卷曲的压敏胶粘片，其制作方法，包括如 下步骤：
1、按照上述百分含量配比及制作步骤制得加热膨胀规律型卷曲的压敏胶粘片初始卷料；
2、通过贴合与其宽度一致的离型膜保护胶面，在离型膜的背面贴合一层过渡保护膜，使在模切冲压时离型膜不被打穿；
3、然后用精度在±0.3mm的模刀进行模切冲切，收卷得到带离型膜与胶片的成品胶卷，同步收卷清除过渡保护膜废料及胶带废料。
进一步的，所述步骤1中，基膜包括PET膜、PP膜或PI膜。
进一步的，所述步骤2中，过渡保护膜为低粘的保护膜，用于临时牵引固定，市售可得。
优选的，所述步骤3中，精度为±0.1mm。
进一步的，所述步骤3中，所述模切冲切采取每分钟100-400次的冲压。
进一步的，所述步骤3中，模切后段有三个自动收卷棍放有管芯，分别收卷模切成品、模切废料和过渡保护膜。
本发明所提供的加热膨胀规律型卷曲的压敏胶粘片，其中模切方法，包括贴合底膜、贴合过渡保护膜、冲切、除废料、收卷同步连续作业，精密度高，不存在离型膜被打穿、缺胶片及清边不齐情况；本发明所提供的加热膨胀失粘型压敏胶粘带的模切图形设计，胶片为矩形状且含有长短相间的折痕设计，胶带在加热膨胀过程中长边沿短边向内卷曲，刀折痕处释放了部分膨胀应力，使得胶带卷曲方向性及规律性极好，更好的调节胶带膨胀过程中的残余粘性，确保在锂电池浆料涂布烘烤时由于卷曲不规律对浆料外观造成损伤。
附图说明
图1为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片的模切方法的工 艺流程图；
图2为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片模切后卷状图示；
图3为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片的模切规格设计图示；
图4为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片无刀折痕模切，在高温烘烤发泡后的卷曲情况示意图；
图5为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片按照本发明的图形设计模切加热膨胀卷曲情况示意图。
具体实施方式
以下结合具体实施方式对本发明申请所述的技术方案进行说明，目的是为了公众更好地理解所述技术方案，而不是对其进行任意限制。
如图1所示，为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片的模切方法的工艺流程图，所述的模切方法包括如下步骤：
序号A：涂布好的热膨胀失粘压敏胶粘带卷料；
序号B：离型膜卷料；
序号G1：第一次张力贴合，使胶粘带与离型膜贴合；
序号C：模切过渡保护膜卷料(与离型膜背面贴合，临时固定防止离型膜被冲切损坏)；
序号G2：第二次贴合，使离型膜背面与过渡保护膜贴合；
序号D：模切冲切刀具；
序号G3：第三次压合辊，废料剥离时固定胶片与离型膜；
序号E：胶粘带废料收卷；
序号F：过渡保护膜废料收卷；
序号H：模切胶卷收卷(将离型膜及冲切好的胶片卷于收卷辊)。
如图2所示，为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片模切后卷状图示，其中：
1：底膜的整体宽度(20～100mm)较胶片长度宽；
2：胶片的长度(10～50mm)；
3：胶片的宽度(10～50mm)；
4：胶片与底膜两边的距离(≥0mm)；
5：胶片与胶片的间距(≥1mm)。
图3，为本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片的模切规格设计图示：
6、7：胶片模切刀痕宽度，6≥7且6＜3(胶片的宽度)，长1～45mm；
8：模切刀痕与胶片宽边部距离；
9：模切刀痕与刀痕、刀痕与胶片平行边部的间距，1～20mm；
10：模切长短刀痕左右两边的长度差≥0mm；
11：模切倒角半径R＝0-5mm。
图4为此加热膨胀规律型卷曲的压敏胶粘片随一裁切规格，无刀折痕模切，在高温烘烤发泡后的卷曲情况：胶片四边卷曲方向、规律不一致。
图5为此加热膨胀规律型卷曲的压敏胶粘片按照本发明的图形设计模切加热测试，膨胀时刀折痕处开口打开向左右两边释放了部分膨胀应力，有效的控制了卷曲速率及卷曲度，由于矩形图形长短边尺寸差异，长边的变形度较短 边变形度大而且受力小，因此长边沿着短边方向向内卷曲，总体达到胶带膨胀后卷曲规律性、方向性一致。
本发明申请所述的加热膨胀规律型卷曲的压敏胶粘片，通过设计精密模切成形使胶带发泡后卷曲方向一致、规律。
应该理解的是，上述内容不是对所述技术方案的限制，事实上，在相同或近似的原理下，对所述技术方案进行的改进，等同变化与修饰，均仍属于本发明申请所要求保护的技术方案。

Claims (9)

  1. 一种加热膨胀规律型卷曲的压敏胶粘片，其特征在于，胶片与离型膜卷料规格为：胶粘片的长边或者短边与离型膜的宽边相平行，离型膜宽度规格大于与胶粘片的垂直边，且与胶粘片两边距≥1mm；离型膜尺寸如下：长：100～500m，宽：20～100mm；胶粘片尺寸为：长：10～50mm，宽：10～50mm；胶片与胶片之间间距≥1mm，且以上尺寸规格偏差＜±0.2mm。
  2. 根据权利要求1所述的加热膨胀规律型卷曲的压敏胶粘片，其特征在于，胶片的规格为：胶片形状为含有刀折痕的矩形状，胶片长：10～50mm，宽：10～50mm，刀折痕为长短相间相互平行或者同一规格长度相互平行，折痕打穿胶片且不能打穿离型膜，折痕的长：2～45mm，刀痕与刀痕间距：1～20mm；胶片倒角R＝0-5mm；且以上尺寸规格偏差＜±0.2mm。
  3. 根据权利要求1所述的加热膨胀规律型卷曲的压敏胶粘片，其特征在于：所述胶片在90～180℃加热膨胀后卷曲规律及方向一致，两长边沿着短边方向内卷曲呈卷筒状，且卷曲度大于短边尺寸的50％。
  4. 权利要求1所述的加热膨胀规律型卷曲的压敏胶粘片的制作方法，其特征在于，包括如下步骤：
    1)制得加热膨胀规律型卷曲的压敏胶粘片的初始卷料；
    2)通过贴合与其宽度一致的离型膜保护胶面，在离型膜的背面贴合一层过渡保护膜，为了使在模切冲压时离型膜不被打穿；
    3)然后用精度在±0.3mm的模刀进行模切冲切，收卷得到带离型膜与胶片的成品胶卷，同步收卷清除过渡保护膜废料及胶带废料。
  5. 权利要求4所述的加热膨胀规律型卷曲的压敏胶粘片的制作方法，其特征在于，所述步骤1)中，基膜包括PET膜、PP膜或PI膜。
  6. 权利要求4所述的加热膨胀规律型卷曲的压敏胶粘片的制作方法，其特 征在于，所述步骤2)中，过渡保护膜为低粘的保护膜，用于临时牵引固定，市售可得。
  7. 权利要求4所述的加热膨胀规律型卷曲的压敏胶粘片的制作方法，其特征在于，所述步骤3)中，精度为±0.1mm。
  8. 权利要求4所述的加热膨胀规律型卷曲的压敏胶粘片的制作方法，其特征在于，所述步骤3)中，所述模切冲切采取每分钟100-400次的冲压。
  9. 权利要求4所述的加热膨胀规律型卷曲的压敏胶粘片的制作方法，其特征在于，所述步骤3)中，模切后段有三个自动收卷棍放有管芯，分别收卷模切成品、模切废料和过渡保护膜。
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