CN102189683A - 树脂部件的激光接合方法以及树脂部件的激光接合体 - Google Patents

树脂部件的激光接合方法以及树脂部件的激光接合体 Download PDF

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Publication number
CN102189683A
CN102189683A CN2011100316091A CN201110031609A CN102189683A CN 102189683 A CN102189683 A CN 102189683A CN 2011100316091 A CN2011100316091 A CN 2011100316091A CN 201110031609 A CN201110031609 A CN 201110031609A CN 102189683 A CN102189683 A CN 102189683A
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China
Prior art keywords
laser
resin component
resin
light absorber
laser bonding
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CN2011100316091A
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English (en)
Inventor
松尾直之
下田麻由
木部龙太
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Nitto Denko Corp
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Nitto Denko Corp
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Priority claimed from JP2010270428A external-priority patent/JP5555613B2/ja
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of CN102189683A publication Critical patent/CN102189683A/zh
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/168—Laser beams making use of an absorber or impact modifier placed at the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
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    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
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Abstract

本发明的目的是提供树脂部件的激光接合方法以及树脂部件的激光接合体，在介由光吸收剂进行树脂部件的激光接合时，即使发生激光输出功率变动、聚光密度变动这样的工序变动，也能够防止树脂部件的分解、碳化这样的产品不良的发生，能够迅速地实施激光接合。本发明提供的树脂部件的激光接合方法的特征在于，是使2个以上的树脂部件接触、并对配置在其接触面邻域的光吸收剂照射激光从而使树脂部件熔敷而接合的方法，前述树脂部件的至少任意一个是具有低于300℃的玻璃化转变点或熔点的热塑性树脂，前述光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上。

Description

树脂部件的激光接合方法以及树脂部件的激光接合体
技术领域
本发明涉及使树脂部件与树脂部件接合的树脂部件的接合方法，以及2个以上的树脂部件接合而成的树脂部件的接合体。
背景技术
以往，作为将树脂部件与树脂部件接合的方法，采用通过激光使树脂部件之间熔敷的方法。在通过激光使该树脂部件之间熔敷的情况下，通常采用下述方法：使这些树脂部件与树脂部件在其表面相互面接触的状态下重叠，对该叠合的部分照射激光使构成树脂部件的表面的树脂材料熔融从而形成熔敷部的方法；使树脂部件的端部与端部对接、并以跨过两者的方式叠合其他树脂部件，对该叠合的部分照射激光使构成树脂部件的表面的树脂材料熔融从而形成熔敷部的方法等。
这样的利用熔敷来进行的树脂部件的接合是通过如下方法进行的：在要熔敷的地方配置光吸收剂，对配置有该光吸收剂的地方照射激光，使该照射的激光从树脂部件的背面侧透射到表面侧并到达光吸收剂，通过该光吸收剂吸收激光，将激光的光能转变为热能，由此来熔敷前述树脂部件的面接触的地方。作为用于照射的激光，例如，可以使用红外线激光、近红外线激光，作为配置在树脂部件的面接触的地方的光吸收剂，可以使用炭黑、卟啉系吸收剂等在红外区域、近红外区域具有吸收峰的物质(参照下述专利文献1和2)。
通过使用这样的使用了光吸收剂的激光熔敷方法，在使对激光具有高透明性的树脂部件之间的熔敷中，可以通过仅使树脂部件的界面发热、熔融而熔敷。
然而，在上述那样的使用了光吸收剂的激光熔敷方法中，在发生例如，作为激光光源的激光振荡器的输出功率变动、被加工物的表面凹凸导致聚光密度变动这样的制造工序中的预料之外的变动时，有时由激光供给的热量过剩，结果存在下述问题，作为被加工物的树脂部件变得高于预定的加热温度而发生分解或者碳化反应，产生产品不良。尤其，在以玻璃化转变温度Tg、熔点不那么高的树脂部件为接合对象、并提高激光输出功率迅速进行激光接合这种情况下，上述那样的问题变得更显著。
现有技术文献
专利文献
专利文献1：日本特表2002-526261号公报
专利文献2：日本特许3682620号公报
发明内容
发明要解决的问题
本发明是鉴于这样的现有技术的问题点而进行的，目的在于，提供在借助光吸收剂进行树脂部件的激光接合时，即使在发生激光输出功率变动、聚光密度变动这样的工序变动时，也能够防止树脂部件的分解、碳化这样的产品不良的发生，并且能够迅速地实施激光接合的树脂部件的激光接合方法以及树脂部件的激光接合体。
用于解决问题的方案
本发明是为了解决上述那样的现有技术的问题而进行的，本发明的树脂部件的激光接合方法的特征在于，是使2个以上的树脂部件接触、并对配置在其接触面邻域的光吸收剂照射激光使树脂部件熔敷来进行接合的树脂部件的激光接合方法，前述树脂部件的至少任意一个是具有低于300℃的玻璃化转变点(以下，有时简记为Tg)或熔点的热塑性树脂，前述光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上。
此外，本发明的树脂部件的激光接合体的特征在于，是通过使2个以上的树脂部件接触、并对配置在其接触面邻域的光吸收剂照射激光使树脂部件之间熔敷接合而成的树脂部件的激光接合体，前述树脂部件的至少任意一个是具有低于300℃的玻璃化转变点或熔点的热塑性树脂，前述光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上。
发明的效果
本发明的树脂部件的接合方法和接合体中，配置在接触面邻域的光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上，因而，在通过激光照射而供给了部分过剩的热能的情况下，该过剩的热能使光吸收剂自身分解。因此，在采用具有低于300℃的玻璃化转变点或熔点的热塑性树脂作为被激光接合的树脂部件的任意一个时，即使在发生例如，作为激光源的激光振荡器的输出功率变动、被加工物的表面凹凸导致聚光密度变动这样的预料之外的变动时，从激光供给的热能也不会过剩，能够抑制该树脂部件的分解、碳化反应，并且能够防止产品不良的发生。
附图说明
图1是表示第一实施方式的树脂部件的激光接合方法的侧视图。
图2是表示通过第一实施方式的激光接合方法接合得到的树脂部件的接合体的侧视图。
图3是表示第二实施方式的树脂部件的激光接合方法的侧视图。
图4是表示通过第二实施方式的激光接合方法接合得到的树脂部件的接合体的侧视图。
图5是表示第三实施方式的树脂部件的激光接合方法的侧视图。
图6是表示通过第三实施方式的激光接合方法接合得到的树脂部件的接合体的侧视图。
图7是表示对实施例及比较例中使用的光吸收剂使用差热天平测得的重量减少量的测定结果的图。
附图标记说明
10a、10b、10c    树脂部件
20               光吸收剂
30               载置台(stage)
40               加压单元
50               激光
具体实施方式
以下，参照附图说明本发明的优选实施方式。
图1是表示本发明的第一实施方式的树脂部件的激光接合方法的侧视图，附图标记10a、10b表示片状的树脂部件，附图标记50表示激光。此外，图2是表示通过该第一实施方式的激光接合方法接合得到的树脂部件的接合体的侧视图。
如图1所示，第一实施方式的树脂部件的激光接合方法是，在使片状的树脂部件10a、10b的各端部上下叠合的状态下，使该树脂部件10a、10b的接触面熔融从而进行粘接的方法。具体而言，在该树脂部件10a、10b的接触面涂布光吸收剂20，通过照射激光50使该光吸收剂20发热，该热使得前述树脂部件10a、10b的接触面熔融，从而进行这些树脂部件10a、10b的接合。
对于作为接合对象的树脂部件10a、10b，只要至少任意一方是在其接合面具备具有低于300℃的Tg或熔点的热塑性树脂的树脂部件即可，对其材质没有特别的限定。
作为具有低于300℃的Tg或熔点的热塑性树脂，例如可列举出聚碳酸酯树脂、聚乙烯醇树脂、聚乙烯树脂、聚丙烯树脂、聚对苯二甲酸乙二醇酯树脂、聚氯乙烯树脂、三乙酰基纤维素、聚甲基丙烯酸甲酯树脂、环烯烃聚合物、降冰片烯树脂、聚甲醛树脂、聚醚醚酮树脂、聚醚酰亚胺树脂、聚酰胺酰亚胺树脂、聚丁二烯树脂、聚氨酯树脂、聚苯乙烯树脂、聚甲基戊烯树脂、聚酰胺树脂、聚缩醛树脂、聚对苯二甲酸丁二醇酯树脂、乙烯乙酸乙烯酯树脂等。
此外，按照JI S K7121(1987)，使用差示扫描量热计(Seiko Instruments Inc制造，DSC6220)，以10℃/min升温，求出DSC曲线，并由其外推求得玻璃化转移起始温度，从而能够得到Tg。
该树脂部件的厚度优选为1μm以上且10mm以下。该树脂部件的厚度低于1μm时，该树脂部件的操作变得困难，为10mm以上时，有可能由于该树脂部件的光吸收导致激光衰减，到达光吸收剂的效果降低，导致生产率降低。
此外，只要激光接合的层也即树脂部件10a、10b中的至少任意一方的接合面为前述热塑性树脂即可，因此，该树脂部件可以是单层、或者也可以是层叠结构，对层叠的其它层的性质没有特别的限制。此外，接合面的热塑性树脂、层叠的其它层中，可以含有抗氧化剂、阻燃剂、交联剂、光稳定剂、颜料、填充材料等任意的添加剂。
其中，对于配置在激光照射侧的树脂部件，优选树脂部件整体具有30％以上的透光率，更优选具有50％以上的透光率。
作为前述光吸收剂20，可以采用使用差热天平加热到350℃测定的重量减少量为40％以上的光吸收剂，进而，优选采用加热到400℃测定的重量减少量为60％以上的光吸收剂。
通过使用这样的物性的光吸收剂，即使在发生例如，激光振荡器的输出功率变动、被加工物的表面凹凸导致的聚光密度变动这样的制造工序中的预料之外的变动的情况下，也能够防止光吸收剂被加热到400℃以上，能够防止树脂部件的分解、碳化反应。
作为该光吸收剂，可以采用颜料、染料等中的满足上述条件的各种物质。此外，作为该光吸收剂的具体的使用方法，可列举出：在前述树脂部件的接合面上形成含有该光吸收剂的层的方法；或者使前述树脂部件的接合面含有该光吸收剂的方法。在树脂部件的接合面上形成层的情况下，可以采用例如，用有机溶剂等稀释光吸收剂后通过适当的涂布手段进行涂布的方法。此外，干燥后该层的厚度优选为1μm以下，进而，更优选为0.5μm以下。含有光吸收剂的层的厚度超过1μm时，有可能妨碍被接合的2个树脂部件的相容。此外，作为该含有光吸收剂的层的光吸收性优选为20％以上、更优选为30％以上。含有光吸收剂的层的涂布幅度可以根据激光照射范围适当最优化。
作为所述光吸收剂，例如，可列举的炭黑、卟啉系吸收剂、酞菁系吸收剂、萘酞菁系吸收剂、聚甲炔系吸收剂、二苯基甲烷系吸收剂、三苯基甲烷系吸收剂、醌系吸收剂、偶氮系吸收剂、二亚胺盐(diimmonium salt)等。作为这些光吸收剂的具体例子，可以适宜使用美国Gentex Corporation以“Clearweld”商品名市售的光吸收剂。该美国Gentex Corporation制造的“Clearweld”使用差热天平加热到350℃测定的重量减少量为60％。
此外，本发明中的使用差热天平得到的重量减少量，更具体地是通过下述实施例中记载的方法来测定的。
此外，作为吸收剂的涂布方法，例如可以使用针尖分配器(needle tip dispenser)、喷墨打印、丝网印刷、2流体式、1流体式或超声波式喷雾、印模等一般的方法。
作为使树脂部件相互叠合的方法，优选的是，例如，如图1所示，在载置台30上配置作为接合对象的至少2片树脂部件10a、10b使其叠合，使用加压单元40从其上方进行按压，并在固定该树脂部件的状态下照射激光50。
作为前述加压单元，可以适宜使用具备对所用激光显示高透明性的玻璃作为加压单元的加压单元。加压强度优选为0.5～100kgf/cm2，更优选为1～20kgf/cm2。只要能够对激光照射部施加负载，对该加压单元的形状就没有特别的限定，例如，可以使用平板状、圆筒状、球状的加压单元。对加压单元的厚度没有特别的限定，但过薄时，由于应变导致不能进行良好的加压，过厚时，激光的利用效率降低，因此，为3mm以上且低于30mm是优选的，为5mm以上且低于20mm是更优选的。作为加压单元的材质，例如，可以使用熔融石英、无碱玻璃、TEMPAX(商品名)、PYREX(商品名)、维克玻璃、D263、OA10、AF45等。为了提高激光的利用效率，优选玻璃部件对所用的激光波长具有高的透明性，具体而言，透光率为50％以上是优选的，为70％以上是更优选的。
此外，从对大面积均匀地加压从而在其全部区域进行良好的接合的观点考虑，优选在加压单元与树脂部件之间插入透光性良好且有缓冲性的橡胶、树脂材料等(以下，称作相间材料)。作为该相间材料，例如可列举出有机硅橡胶、聚氨酯橡胶等橡胶系材料、聚乙烯等树脂材料。相间材料的厚度为50μm以上且低于5mm是优选的，为1mm以上且低于3mm是更优选的。低于50μm时，缺乏缓冲性，为5mm以上时，可能由于吸收、散射导致激光的利用效率降低。相间材料优选对所用的激光波长具有30％以上的透光率，具有50％以上的透光率是更优选的。
此外，作为前述载置台30的材质，可以使用金属、陶瓷、树脂、橡胶等。为了对宽的面积均匀地加压从而得到良好的接合状态，优选使用橡胶。进而，为了提高与接合后的片材的剥离性、为了提高耐热性，可以对该橡胶的表面进行表面处理，或者在该橡胶上配置其它树脂部件等。
此外，对照射的激光50没有特别的限定，例如，可列举出半导体激光、光纤激光、飞秒激光、YAG激光等固体激光、CO2激光等气体激光。
在这些中，从廉价且易于获得面内均匀强度的激光方面考虑，优选半导体激光、光纤激光。
此外，在防止树脂自身的分解且容易促进熔融方面，连续波的CW激光(Continuous-Wave Laser)比瞬间投入高能量的脉冲激光更合适。
此外，激光的输出功率、功率密度、光斑大小、照射次数、扫描速度等可以根据树脂材料的种类、厚度、光吸收率等适宜选择。
此外，通过使照射激光50的位置在接触面的面方向移动，能够使大面积的接触面之间熔敷。具体而言，例如，可以使利用聚光透镜聚光成所期望的光束尺寸的斑束(spot beam)对所期望的溶接部位进行扫描照射，从而可以进行大面积的熔敷。此外，也可以通过恒流扫描仪(Galvano-Scanner)在固定激光头的状态下仅扫描光束，进而，也可以通过使用衍射光学元件这样的光学元件将激光光束整形成所期望的形状，从而不进行扫描而是一次性地实施大面积的熔敷。
此外，在上述那样的树脂部件的接合方法中，调整激光50的照射条件和/或上述加压条件，在熔敷部位的树脂材料之间的界面消失的状态下进行熔敷是优选的。通过使界面消失，能够使其充分的相容，实现粘接强度的提高，此外，也可以成为光的透过性等良好的物质。
根据本第一实施方式的树脂部件的接合方法，在树脂部件10a和树脂部件10b的接合面配置有光吸收剂，所述光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上，因此，即使在激光振荡器的输出功率变动、或者激光的聚光密度变动、照射了过量激光的情况下，也能够抑制该光吸收剂的温度过度升高，能够防止树脂部件的分解、碳化。
此外，本发明的树脂部件的激光接合方法和激光接合体不限于上述第一实施方式，可以对接合的树脂部件的位置关系、光吸收剂的配置场所等进行各种改变。以下，作为其它实施方式，对第二及第三实施方式进行说明。
图3是表示本发明的第二实施方式的树脂部件的接合方法的侧视图，图4是表示通过第二实施方式的接合方法接合得到的树脂部件的接合体的侧视图。
如图3所示，本第二实施方式中，按照作为接合对象的片状的树脂部件10a、10b的各个端部在同一平面上对接的方式配置，以与这些树脂部件10a和10b两者都重叠的方式叠合其它树脂部件(第三树脂部件)10c，将该第三树脂部件10c与前述树脂部件10a、10b的接触面分别熔融来进行粘接。具体而言，以介于树脂部件10a与第三树脂部件10c之间以及介于树脂部件10b与第三树脂部件10c之间的方式配置光吸收剂20，通过对这些光吸收剂20照射激光50使各个接合面的树脂部件熔敷，介由树脂部件10c使树脂部件10a与树脂部件10b接合。
因此，本实施方式中，在同一平面上对接地配置的树脂部件10a和10b、或者在它们之上配置的第三树脂部件10c中，至少任一个是在接合面具备具有低于300℃的Tg或熔点的热塑性树脂的树脂部件即可。
此外，该第二实施方式中，光吸收剂20、激光50、载置台30以及加压单元40可以采用与前述第一实施方式相同的物质。
此外，图5是表示本发明的第三实施方式的树脂部件的激光接合方法的侧视图，图6是表示通过该第三实施方式的激光接合方法接合而得到的树脂部件的接合体的侧视图。
如图5所示，本第三实施方式中，以使作为接合对象的片状的树脂部件10a、10b的各个端部在同一平面上对接的方式配置，以与这些树脂部件10a和10b两者重叠的方式叠合发热介质11，通过由该发热介质11供给的热使前述树脂部件10a与树脂部件10b的接触面熔融从而进行粘接，之后，剥离发热介质11。树脂部件10a、10b中的至少任意一方具备具有低于300℃的Tg或熔点的热塑性树脂。
更具体而言，本第三实施方式的激光接合方法中，以介于树脂部件10a与发热介质11之间以及介于树脂部件10b与发热介质11之间的方式配置光吸收剂20，通过对该光吸收剂20照射激光50使树脂部件10a与树脂部件10b的接合面的树脂部件熔敷，从而使树脂部件10a与树脂部件10b接合。发热介质11在其表面涂布有光吸收剂20，通过光吸收剂20将照射的激光的能量转换为热能传递到树脂部件，因此，树脂部件之间熔敷后被剥离除去。该发热介质11、如图5所示，可以以从表面背面两面夹持树脂部件的方式配置，或者，也可以仅配置在表面和背面的任意一面。
实施例
接着，列举实施例进一步详细地说明本发明，但只要不超出本发明的要旨，本发明不限于以下的实施例。
实施例1
实施例1中所用的使用材料如下。
使用材料
·树脂部件A  材质三乙酰基纤维素(FUJIFILM Corporation制造，Tg170℃，熔点275℃)
厚度80μm
形状10mm×50mm
·光吸收剂A Gentex Corporation制造商品名“Clearweld LD 120C”(使用差热天平加热到350℃测定的重量减少量为60％)
·激光        波长        940nm
输出功率    30W
光斑        2mmΦ
·加压单元    材质        熔融石英玻璃
厚度        10mm
·载置台      硅橡胶(3mm厚)上层压有聚酰亚胺(Du Pont Kabushiki Kaisha制造，商品名“Kapton”125μm厚)的物质。
重量减少量的测定
使用差热天平(Thermo plus，Rigaku Corporation制造，TG8120系列高温型)测定重量减少量。测定条件如下。
·升温速率    10℃/min
·测定氛围气  N2
·测定温度    30～500℃
·保持时间    0min
图7是表示使用上述差热天平测定下述实施例及比较例中所使用的光吸收剂A的重量减少量的测定结果的图。
激光接合测试
在树脂部件A的端部的宽度10mm×长度10mm的范围涂布光吸收剂A并使其干燥，形成厚度为100nm的光吸收剂A的涂布层。该光吸收剂A的涂布层对波长为940nm的激光的透射率为40％。将该形成有涂布层的树脂部件A放置到载置台上，以覆盖光吸收剂的涂布层的方式叠合相同材质的另一树脂部件A，并通过加压单元以15kgf/cm2的压力从其上方按压。在按压了该加压单元的状态下，将上述条件的激光分别调节到30W和70W，以速度100mm/s进行单行扫描照射，进行树脂部件A的激光接合。
测试结果
目视观察经过上述激光接合测试的树脂部件后确认，在激光为30W和70W的任一情况下，树脂均以良好的状态接合，没有发生分解、碳化等。
实施例2
使用材料
·光吸收剂B    酞菁系染料(使用差热天平加热到350℃测定的重量减少量为42％)
其它材料使用与实施例1相同的材料。
激光接合测试
在甲苯中以1重量％的比例溶解上述光吸收剂B来制作光吸收剂溶液，在树脂部件A的端部的宽度10mm×长度10mm的范围以20mL/mm2的涂布量涂布光吸收剂溶液，并使甲苯挥发和干燥，由此形成了光吸收剂的涂布层。之后，与上述实施例1的激光接合测试同样地，以激光输出功率30W和70W进行激光接合。
测试结果
目视观察经过上述激光接合测试的树脂部件后确认，在激光为30W和70W的任一情况下，树脂均以良好的状态接合，没有发生分解、碳化等。
实施例3
使用材料
·树脂部件B  材质    聚对苯二甲酸乙二醇酯(PET，Tg67℃，熔点243℃)
厚度    50μm
形状    10mm ×50mm
其它材料使用与实施例1相同的材料。
激光接合测试
使用树脂部件B，除此之外，与上述实施例1的激光接合测试同样地，进行激光输出功率为30W和70W的激光接合。
测试结果
目视观察经过上述激光接合测试的树脂部件后确认，在激光为30W和70W的任一情况下，树脂均以良好的状态接合，没有发生分解、碳化等。
实施例4
使用材料
·树脂部件C  材质    聚碳酸酯(PC、Tg 146℃、熔点253℃)
厚度    70μm
形状    10mm×50mm
其它材料使用与实施例1相同的材料。
激光接合测试
使用树脂部件C，除此之外，与上述实施例1的激光接合测试同样地，进行激光输出功率为30W和70W的激光接合。
测试结果
目视观察经过上述激光接合测试的树脂部件后确认，在激光为30W和70W的任一情况下，树脂均以良好的状态接合，没有发生分解、碳化等。
实施例5
使用材料
·树脂部件D  材质    聚乙烯醇(KURARAY CO.，LTD.制造，无Tg，熔点210℃)
厚度    75μm
形状    10mm ×50mm
其它材料使用与实施例1相同的材料。
激光接合测试
使用树脂部件D并将激光输出功率改变为90W，除此之外，与上述实施例1的激光接合测试同样地，进行激光接合。
测试结果
目视观察经过上述激光接合测试的树脂部件后确认，树脂以良好的状态接合，没有发生分解、碳化等。
比较例1
<使用材料>
·光吸收剂C    山本化成公司制造，商品名“YKR”(使用差热天平加热到350℃测定的重量减少量为30％)
使用上述光吸收剂，除此之外，其它材料使用与实施例1相同的材料。
激光接合测试
使用上述光吸收剂C作为光吸收剂，除此之外，与实施例1同样地，实施激光输出功率为30W和70W的激光接合测试。
测试结果
目视观察经过上述激光接合测试的树脂部件确认，在激光为30W的情况下，能够实现没有树脂部件的分解、碳化等的良好的接合。然而，在激光为70W的情况下，在激光照射部散布有变色成黑色的部分，而且接合体发出烧焦的气味。由此可见，在该测试中，由于激光的过度照射导致树脂部件发生了碳化。
比较例2
使用材料
·光吸收剂D  在树脂中配合含有次甲基系油溶性染料的着色剂而制造的油墨型光吸收剂(ORIENT CHEMICAL INDUSTRIES CO.，LTD制造，商品名“eBIND ink”，使用差热天平加热到350℃测定的重量减少量为37％)
使用上述光吸收剂，除此之外，其它材料使用与实施例1相同的材料。
激光接合测试
使用上述光吸收剂D作为光吸收剂，除此之外，与实施例1同样地，实施激光输出功率为30W和70W的激光接合测试。
测试结果
目视观察经过上述激光接合测试的树脂部件确认，在激光为30W的情况下，能够实现没有树脂部件的分解、碳化等的良好的接合。然而，在激光为70W的情况下，在激光照射部分散布有变色成黑色的部分，而且接合体发出烧焦的气味。由此可见，在该测试中，与比较例1同样地，由于激光的过度照射导致树脂部件发生了碳化。
比较例3
使用材料
·树脂部件E  材质    热塑性聚酰亚胺(Tg：315℃)
厚度    50μm
形状    10mm×50mm
使用上述树脂部件，除此之外，其他材料使用与实施例1相同的材料。
激光接合测试
使用上述树脂部件E作为树脂部件，进而，将激光输出功率改变为90W，除此之外，与实施例1同样地实施激光接合测试。
测试结果
上述激光接合测试的结果，不能将树脂部件接合。认为这是因为，树脂部件E为高耐热性的热塑性聚酰亚胺，因此，没有获得能够将其熔融的热量。
比较例4
使用材料
·树脂部件E    (同上)
·光吸收剂D    (同上)
使用上述树脂部件E和光吸收剂D，除此之外，其它材料使用与实施例1相同的材料。
激光接合测试
使用上述树脂部件E作为树脂部件，使用上述光吸收剂D作为光吸收剂，进而，将激光输出功率改变为70W，除此之外，与实施例1同样地实施激光接合测试。
测试结果
上述激光接合测试的结果可以确认，能够接合高耐热性的热塑性聚酰亚胺。然而，目视观察树脂部件确认，在激光照射部散布有变色成黑色的部分。由此可见，在该测试中，由于激光的过度照射导致树脂部件发生了碳化。

Claims (2)

1.一种树脂部件的激光接合方法，其特征在于，是使2个以上的树脂部件接触、并对配置在其接触面邻域的光吸收剂照射激光使树脂部件熔敷来进行接合的树脂部件的激光接合方法，
所述树脂部件的至少任意一个是具有低于300℃的玻璃化转变点或熔点的热塑性树脂，所述光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上。
2.一种树脂部件的激光接合体，其特征在于，是通过使2个以上的树脂部件接触、并对配置在其接触面邻域的光吸收剂照射激光使树脂部件之间熔敷接合而得到的树脂部件的激光接合体，
所述树脂部件的至少任意一个是具有低于300℃的玻璃化转变点或熔点的热塑性树脂，所述光吸收剂使用差热天平加热到350℃测定的重量减少量为40％以上。
CN2011100316091A 2010-02-04 2011-01-27 树脂部件的激光接合方法以及树脂部件的激光接合体 Pending CN102189683A (zh)

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JP2008119839A (ja) * 2006-11-08 2008-05-29 Toyota Motor Corp 樹脂材のレーザ溶着方法および樹脂部品
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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