CN104136510A - 形成离型层的方法 - Google Patents
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Abstract
一种在基材上形成硅酮离型层的方法,其用于数字胶印系统的中间转印构件,该方法包括:a)在该基材上提供可固化的第一底漆;b)在该基材上提供可固化的第二底漆;c)在该可固化的第一底漆和第二底漆上提供可固化的硅酮离型组合物;以及d)固化该第一底漆、第二底漆和离型组合物。
Description
背景技术
数字印刷机的HP Indigo生产线是以数字胶印彩色技术为基础,其结合了纸质印刷(ink-on-paper)的高品质和在纸张、箔纸和塑料的广泛基材上的多色印刷。这些数字印刷机提供了成本合算的小批量印刷、按需服务以及实时动态颜色转换。
数字胶印系统通过使用数字控制的激光在光电成像印板(photo imaging plate,PIP)的带电表面上产生潜像来工作。根据来自数字图像文件的数字指令来控制激光。数字指令通常包括以下参数中的一个或多个:图像颜色、图像间距、图像强度、颜色层的顺序等。然后将特定的油墨涂覆于PIP的部分带电表面,恢复所需图像。然后将该图像从PIP转印至加热后的胶印滚筒,并从胶印滚筒转印至所需的基材,该基材借助于压印滚筒放在与胶印滚筒相接触的地方。油墨在加热后的胶布上流动。由于胶布在将图像从PIP转印至最终基材时所起的作用,有时可将其称为“中间转印构件”(ITM)。
例如,在Hewlett-Packard(HP)White Paper Publication,“Digital Offset Color vs.Xerography and Lithography”中叙述了典型数字胶印机操作的详细说明。具体而言,能用于产生所公开的印刷品的数字印刷机的实例为HP的数字印刷机Indigo Press.TM.1000、2000、4000,或从Hewlett-Packard Company of Palo Alto,California,USA制造并且可商购的新型印刷机。
为了在转印油墨的过程中均匀施加压力并适应基材表面的轻微变化,胶布通常由弹性材料形成,例如合成橡胶。然而,由于优异的油墨释放性质,通常优选硅酮,用于胶布的最外层。这样的硅酮层是现有技术中已知离型层的一个实例。
然而,由于所需的硅酮的释放性质和橡胶的性质使得在它们各自的表面处难以形成化学键,因此在橡胶底层上涂覆硅酮离型层非常困难。已知的方法包括在橡胶上涂覆底漆层,等待底漆变干,或将底漆固化,在这之前涂覆硅酮离型层。这是耗时的而不是有效的制造方法。
而且,当使用例如铂催化剂在额外的固化反应中形成硅酮离型层时,来自底部橡胶层或胶布之下胶印滚筒本体的化合物会使催化剂中毒而抑制或阻止固化反应。这对于所得的硅酮离型层的质量是不利的。
发明内容
在以下描述中,出于解释说明的目的,为了提供对本发明系统和方法的全面理解,公开了大量具体的细节。然而,对于本领域技术人员显而易见的是,在没有这些具体细节的情况下也能够实现本发明的设备、系统和方法。说明书中的提及的“一个实例”或类似语言表达意制指连同该实例一起描述的具体特征、结构或特性包含于至少一个实例中,而不必包含于其他实例中。
根据本发明的一个实例,描述了在基材上提供硅酮离型层的方法。该方法适用于在制造数字胶印系统的中间转印构件时提供硅酮离型层。首先将描述这样的数字胶印系统的一个实例。
图1是一种示例性数字胶印系统(100)的图示,其在该实例中为数字液体电致成像(Liquid Electro Photographic,LEP)印刷系统。术语“液体电致成像”或“LEP”是指其中将液体调色剂涂覆到具有静电电荷的图案的表面上以形成对应于该静电电荷图案的液体调色剂图案的印刷方法。然后将该液体调色剂的图案转印到至少一个中间表面,然后转印至印刷介质。在数字LEP系统的操作过程中,油墨图像在光成像滚筒的表面上形成。将这些油墨图像转印至加热后的胶印滚筒,然后转印至印刷介质。光成像滚筒连续旋转,穿过不同的位置(station)以形成下一图像。
在示例性的数字LEP系统(100)中,所需的图像以数字形式被传输至印刷系统(100)。所需的图像可以包括文本、图形或图像的任意组合。所需的图像最初在光成像滚筒(105)上形成,被转印至胶印滚筒(120)外部上的胶布(122),然后被转印至印刷介质(140)。胶布(122)此外也可被称作中间转印构件(ITM)。
根据一个示例性实例,通过旋转光充电单元(110)之下的光成像滚筒(105)的干净的裸露段而在光成像滚筒(105)上形成图像。光充电单元(110)包括充电装置,例如电晕线、充电辊或其他充电装置以及激光成像部分。均匀的静电电荷通过光充电单元(110)堆积在光成像滚筒(105)上。由于光成像滚筒(105)连续转动,其经过光充电单元(110)的激光成像部分,光充电单元(110)驱散成像区域的所选部分中的静电电荷以留下不可见的静电电荷图案,该图案表示待印刷的图像。
油墨通过二进制油墨显影器(Binary Ink Developer,BID)单元(115)被转移至光学成像滚筒(105)上。每种油墨颜色有一个BID单元(115)。在印刷过程中,适合的BID单元与光成像滚筒(105)啮合。啮合的BID单元将油墨均匀的膜送至光成像滚筒(105)。油墨含有带电荷的颜料颗粒,该颗粒被吸引至光成像滚筒(105)的成像区域上的相反电场。油墨从不带电的非成像区域被排斥。现在光成像滚筒(105)在其表面上具有单色油墨图像。
光成像滚筒(105)继续转动并将油墨图像转印至可加热的胶印滚筒(120)的ITM(122)。胶印滚筒将图像从ITM转印至卷绕在压印滚筒(130)上的介质片材。如以下将要进一步描述的,对于最终图像中所要包括的每个着色的油墨层,可重复这个过程。
印刷介质(140)从右侧进入印刷系统(100),越过进料盘(125),并卷绕到压印滚筒(130)上。由于印刷介质(140)接触胶印滚筒(120)的ITM(122),单色油墨图像被转印至该印刷介质(140)。光成像滚筒(105)的产生、转印和清洁为连续过程,每分钟产生和转印数百幅图像。
为了形成单色图像(例如黑白图像),印刷介质(140)穿过压印滚筒(130)和胶印滚筒(120)一次就完成了所需的图像。对于彩色印刷,印刷介质(140)被保留在压印滚筒(130)上,并且使其随着胶印滚筒穿过滚距(nip)(127)与胶印滚筒(120)多次接触。在每次接触时,可将另外的彩色平面至于印刷介质(140)上。术语滚距(nip)是指当两个辊最接近时这两个辊之间的区域。当介质片材或其他材料穿过滚距时,可调节两个辊之间的距离以在该介质上产生压力。
例如,为了产生四色图像,光充电单元(110)在从第二BID单元(115)接收第二油墨颜色的光成像滚筒(105)上形成第二图案。如上所述,该第二油墨图案被转印至ITM(122)并且由于印刷介质(140)随着压印滚筒(130)连续转动而被压印到该印刷介质(140)上。连续进行这一过程直至在印刷介质上形成具有全部四个色彩平面的所需的图像。完成在印刷介质(140)上形成所需的图像之后,该印刷介质(140)可离开机器或者被复制以在印刷介质(140)的反面产生第二图像。由于印刷系统是数字化的,因此操作者能在任何时间改变待印刷的图像,而不需手动重新设置。
图2是根据本发明一个实例的包括ITM的胶印滚筒的一个实例的截面图。胶印滚筒(120)包括基部(150),例如金属滚筒。ITM包括设置在基部(150)上的橡胶层(152)、设置在橡胶层(152)上的底漆层(154)、以及设置在底漆层(154)上的硅酮离型层(156)。该橡胶层此外也可被称为基材(152)。在一些实例中,橡胶层(152)可包含丙烯酸橡胶和固化系统的混合物,该丙烯酸橡胶包含填充有碳黑珍珠(carbon black pearls)130(Cabot,Two Seaport Lane,Suite1300,Boston,MA02210,USA)的丙烯酸树脂Hi-Temp4051EP(Zeon Europe GmbH,Niederkasseler Lohweg177,40547Düsseldorf,Germany),该固化系统可包含例如NPC-50促进剂(衍生自Zeon的铵盐)。该丙烯酸橡胶是至少部分固化的。
任何适合的橡胶都可用于橡胶层152,包括但不限于丁腈橡胶(NBR)、氢化丁腈橡胶(HNBR)、聚氨酯弹性体(PU)、氟烃弹性体和氟硅酮中的任意物质。
现在将要描述在基材上提供硅酮离型层的方法的示例性实例。该方法适用于,但不限于数字胶印系统用的ITM。例如,本发明的方法可在并非用于ITM的不同基材上用于提供硅酮离型层。在示例性实例之后,描述了具体的实例。
在基材(例如丙烯酸橡胶层的外表面)上提供可固化的第一底漆。可使用棒涂工艺(rod coating process)来涂覆第一底漆。第一底漆包含有机硅烷和含钛的第一催化剂,例如有机钛酸盐或钛螯合物。在示例性实例中,有机硅烷为环氧硅烷,例如3-环氧丙氧基丙基三甲氧基硅烷(购自ABCR GmbH&Co.KG,Im Schlehert10D-76187,Karlsruhe,Germany,产品编号SIG5840),第一催化剂为例如AA75(购自DuPont,1007Market St.,Wilmington,Delaware,USA)。第一底漆通过例如缩合反应可固化。
还在基材上提供可固化的第二底漆。可使用棒涂工艺。第二底漆包含有机硅烷和第二催化剂。第二催化剂不同于第一催化剂,例如包含铂,并且例如是在溶液中具有如9%的铂的Karstedt催化剂(购自Johnson Matthey,5th Floor,25Farringdon Street,London EC4A4AB,United Kingdom)或SIP6831.2催化剂(购自Gelest,11East Steel Road,Morrisville,PA19067,USA)。在示例性实例中,有机硅烷为乙烯基硅烷,例如乙烯基三乙氧基硅烷(VTEO,购自Evonik,Kirschenallee,Darmstadt,64293,Germany)、乙烯基三乙氧基硅烷,烯丙基硅烷或不饱和硅烷。在一些实例中,第二底漆可包含其他的有机硅烷,例如环氧硅烷,如3-环氧丙氧基丙基三甲氧基硅烷(购自ABCR GmbH&Co.KG)。第二底漆通过例如加成反应可固化,因此通过不同于第一底漆的机制得到固化。
在该实例中,在已经涂覆到基材的第一底漆上提供第二底漆。因此,第二底漆由基材支撑,并且认为是在基材上但不与基材邻接。在其他实例中,可将第二底漆直接涂覆到基材上然后可将第一底漆涂覆到第二底漆上;在这种情况下,第一底漆在基材上但不与基材邻接。在其他实例中,可将第一底漆和第二底漆混合在一起,然后作为第一底漆和第二底漆的混合物涂覆至基材。当在基材上提供第一底漆和第二底漆时,基材是未固化的。
在第一底漆和第二底漆上提供硅酮离型制剂。可使用棒涂工艺。此时基材可为未固化的。第一底漆和第二底漆在基材上提供后可至少部分被吸收到未固化的基材材料中。例如以1.5至12微米的层厚提供硅酮离型制剂。在该实例中,硅酮离型制剂包含乙烯基硅油和氢化硅交联剂。硅酮离型层也可包含以下的至少一种:含铂催化剂,例如Karstedt型催化剂或Pt(O)与乙烯基硅氧烷配体的络合物;抑制剂,例如炔醇(acetylenic alcohol)、四甲基四乙烯基环四硅氧烷或四甲基二乙烯基二硅氧烷;和填充剂,例如无定形二氧化硅或碳黑。在示例性实例中,硅酮离型层包含乙烯基封端的聚二甲基硅氧烷,例如在25℃时粘度为500mPa·S并且乙烯基含量为0.14mmol/g的Polymer VS500,(购自Hanse Chemie,CharlottenburgerStraβe9,21502Geesthacht,Germany);乙烯基封端的具有链内乙烯基官能团的聚二甲基硅氧烷,例如在25℃时粘度为3000mPa·S并且乙烯基含量为0.4mmol/g的Polymer XPRV5000(购自Hanse Chemie);含有硅-氢化物基团的硅酮聚合物,例如SiH含量为4.2mmol/g的Crosslinker210(购自Hanse Chemie);二乙烯基四甲基二硅氧烷-铂(0)络合物,例如Catalyst510(购自Hanse Chemie);以及链炔醇(alkinol),例如Inhibitor600(购自Hanse Chemie)。硅酮离型制剂可通过例如加成反应固化。
提供硅酮离型制剂后,将第一底漆、第二底漆和硅酮离型制剂固化。上述固化可以同时进行,例如通过将基材与所涂覆的第一底漆、第二底漆和硅酮离型制剂置于室温下15分钟,之后在120℃固化1小时。在120℃固化1小时使得基材材料例如丙烯酸橡胶得到固化。
固化后,基材(152)就与硅酮离型层(156)一起提供,其粘附有包含第一底漆材料(其为固化的第一底漆)和第二底漆材料(其为固化的第二底漆)的底漆层(154)。根据该示例性实例,由于第一底漆和第二底漆中的第一催化剂和第二催化剂,第一底漆材料会包含钛,并且第二底漆材料会包含铂。
本发明的提供硅酮离型层的方法是有优势的。所得硅酮离型层对下面的基材具有优异的粘附性。而且,本发明的方法通过限制和防止来自胶印滚筒的主体和基材的使催化剂中毒的化合物到达第二底漆催化剂而减少或停止抑制硅酮离型制剂的固化,否则会限制或停止硅酮离型制剂的固化。不受任何理论的限制,据信随后提供第一底漆之后提供第二底漆提供了优异的粘附性并且针对有毒的抑制剂形成了屏障。在第一底漆和第二剂底漆中使用不同的第一催化剂和第二催化剂和/或不同的固化反应的组合据信有助于优异的粘附性和抑制减少的特性。设想通过改变第一底漆或第二底漆中催化剂的量,可控制屏障的效力以减少抑制。此外,通过在一个方法步骤中固化第一底漆、第二底漆和硅酮离型制剂,相比于需要在涂覆硅酮离型层之前固化或干燥底漆的现有技术,提供了在基材上提供硅酮离型层的更加有效的方法。
附图说明
附图说明了本文所述原理的实例,并且是说明书的一部分。所说明的实例仅为实施例,而不限制权利要求的范围。
图1是示例性数字胶印系统的图示;且
图2是根据本发明一个实例的中间转印构件的实例的截面图。
具体实施方式
现在将描述根据本发明提供硅酮离型层的方法的具体实施例。
实施例1
使用棒涂工艺,将底漆(P17参见下表1.1)涂布在未固化的丙烯酸层基材上。在该实施例中,将第一底漆和第二底漆混合在一起用于涂覆至基材。然后将加成固化的硅酮离型制剂(RL26参见下表1.2)涂布在所涂覆的底漆混合物上。
表1.1
表1.2
离型层(RL26) | 供应商 Wt% |
Polymer VS500 | Hanse Chemie 69.3 |
Polymer XPRV5000 | Hanse Chemie 17.3 |
Crosslinker210 | Hanse Chemie 8.7 |
Catalyst510 | Hanse Chemie 0.4 |
Inhibitor600 | Hanse Chemie 4.3 |
可将所涂覆的底漆和硅酮离型制剂置于室温(RT)下15分钟以使缩合固化开始。然后在120℃将所得ITM完全固化1小时。
然后用湿磨损测试来测量基材上硅酮离型层的粘附性,该测试包括在RT下将ITM在异构烷烃溶剂(isopar)中浸泡1分钟,然后用织物打磨。得到4/4的评分,使用以下1至4的标准来打分。
湿磨测试的评分:
1 容易-不费力容易地除去离型层;
2 中等-稍用力除去硅酮离型层;
3 良好-很费力除去硅酮离型层;以及
4 优异-无法除去硅酮离型层。
实施例2
使用与实施例1中相同的底漆和方法,但使用来自Johnson Matthey的另一种铂催化剂;参见表2。获得了丙烯酸基材上硅酮离型层的优异粘附性,评分4/4。
表2
实施例3
在本实施例中,将第一底漆和第二底漆分别涂覆在丙烯酸橡胶基材上。第一底漆为缩合固化系统,其含有钛缩合固化催化剂(Tyzor AA75);参见表3.1。随后涂覆第二底漆,其使用铂催化剂用于加成固化系统;参见表3.2。然后涂布加成固化硅酮离型制剂(参见表3.3)。
然后将胶布在120℃完全固化1小时。用湿磨测试来测量基材上硅酮离型层的粘附性,得到4/4的评分。
实施例3的硅酮离型制剂的优点在于,其具有很长的贮存期(数天),使得其可单独储存并且容易重复使用。
表3.1
表3.2
表3.3
离型层 | 供应商 Wt% |
Polymer VS2000 | Hanse Chemie 93.5 |
Crosslinker101 | Hanse Chemie 4.7 |
Inhibitor600 | Hanse Chemie 1.8 |
前文的描述仅为了举例说明和描述所述原理而提供。本说明书并非意在穷举或将这些原理限于所披露的任何具体形式。根据上述教导能够进行多种修改和变更。
Claims (15)
1.一种在基材(152)上形成硅酮离型层(156)的方法,所述方法用于数字胶印系统的中间转印构件,所述方法包括:
a)在所述基材上提供可固化的第一底漆;
b)在所述基材上提供可固化的第二底漆;
c)在所述可固化的第一底漆和第二底漆上提供可固化的硅酮离型制剂;以及
d)固化所述第一底漆、所述第二底漆和所述离型制剂。
2.根据权利要求1所述的方法,其中,所述第一底漆包含第一催化剂,且所述第二底漆包含第二催化剂。
3.根据权利要求2所述的方法,其中,所述第一催化剂包含钛,且所述第二催化剂包含铂。
4.根据权利要求1所述的方法,其中,所述第一底漆通过缩合反应可固化,且所述第二底漆通过加成反应可固化。
5.根据权利要求1所述的方法,其中,所述第一底漆包含环氧硅烷,并且所述第一催化剂包括有机钛酸盐或钛螯合物。
6.根据权利要求1所述的方法,其中,所述第二底漆包含乙烯基硅烷、烯丙基硅烷和不饱和硅烷中的至少一种,并且第二催化剂包括Karstedt催化剂或SIP6831.2催化剂。
7.根据权利要求1所述的方法,其中,所述硅酮离型制剂包含乙烯基硅油、氢化硅交联剂、Karstedt催化剂、含Pt(O)与乙烯基硅氧烷配体的络合物的催化剂、抑制剂、炔醇、四甲基四乙烯基环四硅氧烷、四甲基二乙烯基二硅氧烷、填充剂、无定形二氧化硅、碳黑、乙烯基封端的聚二甲基硅氧烷、乙烯基硅酮、二乙烯基四甲基二硅氧烷-铂(0)络合物和链炔醇中的至少一种。
8.根据权利要求1所述的方法,其中,所述硅酮离型制剂使用包含铂的催化剂通过加成反应可固化。
9.根据权利要求1所述的方法,其中,在步骤a)、b)和c)中,所述基材包含未固化的丙烯酸橡胶,所述丙烯酸橡胶在进行步骤a)、b)和c)之后固化。
10.根据权利要求1所述的方法,其中,所述可固化的第一底漆和所述可固化的第二底漆在步骤a)和b)中作为所述可固化的第一底漆和第二底漆的混合物一起提供。
11.一种用于数字胶印系统的中间转印构件,包含基材(152),所述基材上的底漆层(154),以及所述底漆层上的硅酮离型层(156),所述底漆层包含第一底漆材料和第二底漆材料。
12.根据权利要求11所述的中间转印构件,其中,所述第一底漆材料包含钛,且所述第二底漆材料包含铂。
13.根据权利要求11所述的中间转印构件,其中,所述第一底漆材料包含用第一催化剂固化的环氧硅烷,所述第一催化剂包括有机钛酸盐或钛螯合物,且所述第二底漆材料包含用第二催化剂固化的乙烯基硅烷、烯丙基硅烷和不饱和硅烷中的至少一种,所述第二催化剂包括Karstedt催化剂或SIP6831.2催化剂。
14.根据权利要求11所述的中间转印构件,其中,所述基材包含丙烯酸橡胶。
15.一种数字胶印系统,包含根据权利要求11所述的中间转印构件。
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CN108780293A (zh) * | 2016-07-06 | 2018-11-09 | 惠普印迪戈股份公司 | 释放层 |
CN110249269A (zh) * | 2017-04-10 | 2019-09-17 | 惠普印迪戈股份公司 | 中间转印件 |
CN111868945A (zh) * | 2019-01-28 | 2020-10-30 | 瓦克化学股份公司 | 通过激光转移印刷涂覆至少一个硅酮层的方法 |
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US20110123797A1 (en) * | 2006-07-25 | 2011-05-26 | Meir Soria | Laser printer systems, intermediate transfer members, primer layers for intermediate transfer members, and primer layer compositions |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108780293A (zh) * | 2016-07-06 | 2018-11-09 | 惠普印迪戈股份公司 | 释放层 |
CN110249269A (zh) * | 2017-04-10 | 2019-09-17 | 惠普印迪戈股份公司 | 中间转印件 |
US11135815B2 (en) | 2017-04-10 | 2021-10-05 | Hp Indigo B.V. | Intermediate transfer members |
CN110249269B (zh) * | 2017-04-10 | 2022-04-15 | 惠普印迪戈股份公司 | 中间转印件 |
CN111868945A (zh) * | 2019-01-28 | 2020-10-30 | 瓦克化学股份公司 | 通过激光转移印刷涂覆至少一个硅酮层的方法 |
CN111868945B (zh) * | 2019-01-28 | 2023-08-11 | 瓦克化学股份公司 | 通过激光转移印刷涂覆至少一个硅酮层的方法 |
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EP2771391B1 (en) | 2017-01-11 |
US20140369722A1 (en) | 2014-12-18 |
US9333534B2 (en) | 2016-05-10 |
EP2771391A1 (en) | 2014-09-03 |
WO2013060377A1 (en) | 2013-05-02 |
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