CN102085755A - 具有聚合物层的固体喷墨打印头及其工艺 - Google Patents
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Abstract
打印头组件包括多个被聚合物粘结剂粘结在一起成堆栈的功能板。与该聚合物粘结剂接触的这些功能板的表面经历涂覆过程,该涂覆过程包括在应用粘结剂之前提供助粘剂(即聚多巴胺)涂层。该粘结剂可为可交联丙烯酸粘结剂或热塑性聚酰亚胺。通过将该功能板浸润至多巴胺缓冲溶液中一段足够形成具有预定厚度涂层的时间来施加该聚多巴胺涂层。通过将这些功能板浸没在该多巴胺缓冲溶液中并且同时将该多巴胺溶液的pH值维持在足够使该多巴胺聚合的值,接着将这些板转移至具有不足以维持该聚合反应的pH值的溶液中,来控制该涂层的厚度。
Description
技术领域
本公开涉及多层打印头(例如用于固体喷墨打印机的打印头)的构造。特别地,本公开关注制造该打印头时该多个层粘附在一起的方式。
背景技术
固体喷墨打印机包括打印头,其包括一个或多个充满墨的通道,该通道在一侧与供墨室或池连通,在相对侧具有孔口(orifice),通常被称为喷嘴。发电器,例如压电换能器,放置于这些通道内,靠近该喷嘴,以产生压力脉冲。另一类系统,誉为热喷墨或发泡喷墨,经由靠近该喷嘴的发热电阻产生高速液滴。在靠近该孔或喷嘴的每个墨通道内部,代表数字信息的打印信号在电阻层产生电流脉冲,引起邻近的墨几乎瞬时蒸发并产生泡。
用于固体喷墨打印机的打印头组件的一个示例如图1所示。该组件10包括一系列功能板,每个功能板完成一个赋予的功能,用以控制熔融墨经过该组件分散至基板上。在特定的实施方式中,该打印头组件10包括喷射管板组件11、带有PZT板坯12的压电换能器板13、高脚板(stand-off plate)14、电路板15、转向器板(diverter plate)17、歧管板19和柔性外壁20。该打印头组件10的堆栈也可包括将该转向器板17粘结至该电路板15的离散(discrete)粘结层16,以及将该转向器板17粘结至该歧管19的粘结层18。
这些板通常由铝和/或不锈钢形成。在某些打印头组件中,这些金属板铜焊(brazed)在一起。然而,改进的打印头已经使用聚合物粘结剂膜来连接该堆栈内的这些金属元件。特别地,粘结剂膜被应用于相邻的打印头元件之间,且该堆栈被加热并被紧压直至该粘结剂固化。一种常用的粘结剂是名为R1500的热固型丙烯酸类聚合物。已发现,聚合物膜,例如该R1500膜,会在该聚合物与该金属本身之间具有低于最佳的界面,以至于该粘结剂界面在较高的荷载下会切变。
因此,在用于将打印头堆栈固定在一起的粘结剂与该堆栈内的金属板之间需要改进的界面。
发明内容
为了满足这一需求,提供改善聚合物膜与该打印头组件的该金属板元件之间的粘结力的助粘剂。在一个实施方式中,用聚多巴胺涂覆金属元件的表面。接着将该聚合物粘结剂施加至该涂覆的元件。该聚多巴胺增强了该聚合物粘结剂与该金属之间的粘结力,造成提高的搭接剪切强度,并且提高了破坏载荷。
在一个实施方式中,用于制作用于固体喷墨打印机的打印头组件(其中该打印头包括堆叠在一起的多个功能板)的方法包括:用助粘剂层涂覆相邻的功能板,将粘结剂施加于这些功能板的该助粘剂层,以及用涂覆的功能板形成功能板堆栈。
在一个方面,用助粘剂层涂覆相邻的功能板的步骤包括提供多巴胺缓冲溶液,该溶液具有适合支持该多巴胺聚合的pH值,以及将这些功能板的至少一个浸润一段时间,该一段时间适于将该板涂覆具有预定厚度的聚多巴胺层。该多巴胺缓冲溶液可具有约8.5的初始pH值。在氧化条件下,该多巴胺在被浸润的元件上形成聚多巴胺层。维持该pH足够形成所需聚多巴胺涂层厚度的时间,其后该pH值被调整至足够停止该厚度增长的值,例如约7.0。
附图说明
图1是适用于固体喷墨打印机的打印头的元件分解图。
图2是根据一个公开的实施方式,聚多巴胺膜形成的示意图。
图3是显示该聚多巴胺膜的涂层厚度生长与涂覆时间之间函数的图表。
图4是多巴胺的化学结构式图。
具体实施方式
在一个实施方式中,多巴胺缓冲溶液被用于在金属基板例如该打印头组件10的金属元件上,形成聚多巴胺涂层。在一个特定的实施方式中,羟基酪胺盐酸盐多巴胺(化学结构式如图4所示),来源于Sigma-Aldrich公司,用来源于Teknova公司的Tris缓冲液(100mM TrisHCL,500mM NaCl)缓冲。将该多巴胺在该Tris缓冲液中10∶1(2mg至1mL的比例)稀释至pH值约8.5,如图2所述。在被浸润至该多巴胺缓冲溶液之前,清洗该基板S,例如由超声清洗和O2等离子喷洒。
将该基板S在该多巴胺缓冲溶液中浸润产生所需聚多巴胺涂层厚度所必需的一段时间。该涂层厚度是浸润时间的函数,如图3的图表所示。优选地,在该段时间内该溶液的pH值维持在约8.5,以便利该多巴胺的聚合过程。当达到对于所需厚度的该涂覆时间时,通过将该溶液的pH值降低至低于达到该多巴胺的聚合所必需的pH值,终止该多巴胺的反应。已发现,通过用合适的较低pH溶液(例如氯化钠)稀释,降低该pH值至约7.0,足够终止该聚多巴胺的涂覆过程。然后移走该涂覆的基板S′并在室温下风干。
该助粘剂层的厚度最好足够覆盖该打印头元件的所有表面形貌并在该聚多巴胺和该聚合物粘结剂之间提供最佳的界面。另一方面,该聚多巴胺层不应该太厚以至于不必要地增加用于该打印头组件的该元件堆栈的厚度。在某些实施方式中,已发现优选厚度是介于约7nm和约60nm之间,其与介于约4-9小时的涂覆时间相关,如图3的图表所反映的。
在该打印头10的制造中,每个金属层(例如该转向器板17和歧管19)用助粘剂(例如如上所述的该聚多巴胺)涂覆。接着在组装(assembly)之前,将该聚合物粘结剂施加至这些涂覆的元件。举例来说,该聚合物粘结剂可为可交联丙烯酸粘结剂,或热塑性聚酰亚胺。此处举例,该聚合物粘结剂为R1500粘结剂。
该组装最好维持在最佳的温度和压力以完善该聚多巴胺-粘结剂界面并接着固化该聚多巴胺-粘结剂界面与待粘合的这些金属基板之间的粘结。在特定的测试中,不锈钢测试条被涂覆并接着被用R1500粘结剂在196℃和95psi下粘合70分钟。对于具体的粘结剂和基板而言,这些适当的条件会与本例不同,且会根据实验或经验容易地决定。
用十个搭接剪切样品实施强度测试。四个对照样品未用该聚多巴胺助粘剂处理。相反,不锈钢条仅用该R1500粘结剂粘合。在剩余的六个样品中,不锈钢条用该聚多巴胺助粘剂和如上所述的该R1500粘结剂粘合。这些样品中的三个在该多巴胺溶液被浸润八小时,产生约60nm的涂层厚度。另三个样品在该多巴胺溶液中被浸润三小时,由此产生约7nm的较薄涂层。
这些对照,或未处理的样品产生约1758psi的平均搭接剪切强度。具有60nm聚多巴胺涂层的这些测试样品产生约1994psi的平均搭接剪切强度。这些7nm的较薄聚多巴胺涂层获得了约2041psi的较大的平均搭接剪切强度。每个处理过的样品显示出比这些未处理的样品更大的搭接剪切强度。
在测试之前并不清楚在高处理温度(几乎200℃)下,该聚多巴胺是否保持其增粘特性。如上述结果所示,该聚多巴胺涂层在高温下并未降解。这个结果还证实该聚多巴胺涂层能够经受住该打印头组件10的高操作温度(高至约250℃)。
另外,该聚多巴胺层是否会干扰该粘结剂固化的能力是不确定的。在所描述的实施方式中,该粘结剂R1500是可交联丙烯酸类聚合物。如上所述的测试结果揭示,该聚多巴胺对该R1500粘结剂的交联反应不具有反作用。
该聚多巴胺涂层可被施加至任何粘结在一起以形成该打印头组件的元件,特别是与聚合物粘结剂粘结的元件。该聚多巴胺涂层作为用于粘合的金属元件例如该打印头10的这些不锈钢和铝元件的助粘剂,尤其有效。该打印机的其他元件也会受益于此处公开的该聚多巴胺涂层的增粘特性。
可以预期,该助粘剂涂层会对各种可交联丙烯酸粘结剂例如此处公开的该R1500粘结剂有效。可以进一步预期,该助粘剂涂层会对其他热固型粘结剂例如硅树脂、环氧树脂、双马来酰亚胺、酚醛树脂,和举例来说,热塑性聚酰亚胺有效。
同样可以预期,该助粘剂会对除了此处所公开的铝或不锈钢以外的构成打印头的材料有益。举例来说,可以预期,该助粘剂涂层会被有益地应用于非金属表面,例如由聚酰亚胺、聚醚酰亚胺、聚醚醚酮、聚砜、聚酰胺、聚苯硫醚和液晶聚合物构成的非金属表面。这些基板可以片状或以注塑的元件提供。进一步可以预期,某些陶瓷,例如氧化铝,也会从此次所公开的助粘剂涂层受益。
应当理解,上面描述的各种特征和功能,以及其他特征和功能,或者其等同,可更理想地被合并为许多其他不同的系统或应用。其后会被本领域普通技术人员完成的各种目前无法预料的或者不曾预料到的上述特征和功能的等同、修正、改变或改进,也将被涵盖在所附的权利要求范围内。
Claims (4)
1.打印头组件,其包括:
多个堆叠在一起的功能板;
位于相邻功能板之间的粘结层,用于将这些板粘结在一起;以及
位于至少一个功能板上的助粘剂涂层,其中该助粘剂涂层是在与该粘结层接触之前施加于该板的。
2.权利要求1的打印头组件,其中该助粘剂涂层是聚多巴胺涂层。
3.权利要求1的打印头组件,其中该粘结层包括可交联丙烯酸粘结剂。
4.权利要求1的打印头组件,其中该粘结层包括热塑性聚酰亚胺。
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US12/611,984 | 2009-11-04 | ||
US12/611,984 US8303076B2 (en) | 2009-11-04 | 2009-11-04 | Solid ink jet printhead having a polymer layer and processes therefor |
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CN103332014A (zh) * | 2012-02-24 | 2013-10-02 | 施乐公司 | 使用浸透的网状物以控制粘合剂结合线的质量 |
CN106552282A (zh) * | 2016-12-07 | 2017-04-05 | 武汉医佳宝生物材料有限公司 | 一种新型医用粘合剂 |
CN111868560A (zh) * | 2018-03-20 | 2020-10-30 | 帕诺森斯有限公司 | 取决于脉冲类型选择lidar脉冲检测器 |
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KR101340022B1 (ko) * | 2011-09-20 | 2013-12-10 | 한국과학기술원 | 폴리도파민 고속 코팅방법 |
US8752939B2 (en) | 2012-06-29 | 2014-06-17 | Xerox Corporation | Printhead and method of making the printhead |
DE102016222943B3 (de) * | 2016-11-21 | 2017-12-28 | Leibniz-Institut Für Polymerforschung Dresden E.V. | Metallisierte Oberflächen und Verfahren zu ihrer Herstellung |
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US20110102492A1 (en) | 2011-05-05 |
CN102085755B (zh) | 2013-12-04 |
KR20170013374A (ko) | 2017-02-06 |
US8303076B2 (en) | 2012-11-06 |
KR20110049704A (ko) | 2011-05-12 |
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