CN105593312B - 白色颜料分散体 - Google Patents
白色颜料分散体 Download PDFInfo
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- CN105593312B CN105593312B CN201380079862.1A CN201380079862A CN105593312B CN 105593312 B CN105593312 B CN 105593312B CN 201380079862 A CN201380079862 A CN 201380079862A CN 105593312 B CN105593312 B CN 105593312B
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- tio
- latex
- ink
- pigment
- effective density
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0532—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts
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Abstract
白色颜料分散体包含10至60重量%的低有效密度的TiO2,1至40重量%的胶乳,和余量的分散介质。还公开了使用低有效密度的TiO2的墨水和用于制备低有效密度的TiO2的方法。
Description
背景
喷墨印刷已经成为在各种介质表面(特别是纸张和照片介质基底)上记录图像的普遍方式存在多个原因。这些原因中的一些包括低的印刷机噪音、高速记录的能力和多色记录的能力。此外,可以对于消费者而言相对低的价格获得这些优点。关于喷墨墨水化学,大多数的商用喷墨墨水是水基的。因此,它们的成分通常是水溶性的,如在许多染料的情况下,或是水分散性的,如在颜料的情况下。此外,喷墨墨水具有低的粘度以适应热喷墨体系结构常见的高频喷射和发射(firing)室再填充过程。
在喷墨印刷中,在印刷装置和墨水接收物之间没有物理接触的情况下,使墨水流体的微小液滴直接投射至墨水接收物(receiver)的表面上。该印刷装置以电子方式存储印刷数据并且控制用于以成像方式(image-wise)喷出液滴的机构。通过跨过墨水接收物移动印刷头或以反过来的方式或两者来完成印刷。
在将喷墨墨水喷射至墨水接收物上时,该墨水通常包含液体载色体(vehicle)和一种或多种固体,例如染料或颜料和聚合物粘结剂。将容易理解的是这样的墨水的最佳组成取决于使用的印刷方法和待印刷的墨水接收物的性质。
在具有低亮度的表面(例如黑色表面)上印刷时,白色喷墨墨水提供了具有良好可见度的记录产品。此外,白色墨水对于标记工业产品如由塑料产品制成的那些也是有用的,并且还适合于印刷至木材、金属、玻璃、瓷器和皮革上,因此已经从各方面对其进行研究。
附图简要说明
根据一个实例,图1是制造低有效密度的二氧化钛的流程图。
根据一个实例,图2显示制造低有效密度的二氧化钛的第一合成路径的示意图。
根据一个实例,图3显示制造低有效密度的二氧化钛的第二合成路径的示意图。
根据一个实例,图4是以不透明度(以%表述)和墨水通量(以ng/300th表述)为坐标显示出白色墨水的良好不透明度(遮盖力)的图。
发明详述
在以下的描述中,阐明了许多细节以提供对本文中公开的实例的理解。然而,将理解的是所述实例可以在没有这些细节的情况下实践。尽管已经公开了有限数量的实例,但是应该理解的是存在来自其中的多种修改和变型。可以使用相同的附图标记来指示图中的相似或等同的要素。
在公开和描述本发明之前,将理解的是本公开内容不限于本文中公开的特定方法步骤和材料,因为这样的方法步骤和材料可以在某种程度上变化。还将理解的是本文中使用的术语仅用于描述特定实例的目的。该术语不意在是限制性的,因为本公开内容的范围意在仅被所附权利要求书及其等同内容所限制。
应注意的是除非上下文另有明确指出,否则如本说明书和所附权利要求书中所用的单数形式“一个”、“一种”和“所述”包括复数的指代物。
如本文中所用,“液体载色体”、“载色体”或“液体介质”指的是其中可以使本公开内容的着色剂分散或溶解以形成喷墨墨水的流体。液体载色体是本领域中已知的,并且根据本公开内容的实例可以使用各种各样的墨水载色体。这样的墨水载色体可以包括各种不同试剂的混合物,其包括但不限于表面活性剂、有机溶剂和助溶剂、缓冲剂、生物杀灭剂、粘度改进剂、螯合剂、稳定剂、抗结垢剂(anti-kogation agent)和水。虽然不是液体载色体本身的一部分,但是除着色剂之外,该液体载色体可以携带固体添加剂,例如聚合物、胶乳、UV可固化材料、增塑剂、盐等。此外,术语“水性液体载色体”或“水性载色体”指的是包含水作为溶剂的液体载色体。
如本文中所用,“助溶剂”指的是用于分散颜料或用于聚合反应的存在于墨水载色体中的任何溶剂,其包括有机溶剂和/或水。这样的助溶剂还通过控制溶剂和/或水的蒸发、墨水的粘闭(puddling)等来促进喷墨印刷头中良好的喷嘴健康(health)。
如本文中所用,“颜料”通常包括颜料着色剂、磁性颗粒、金属颗粒、金属氧化物如氧化铝、二氧化硅、二氧化钛、和/或其它陶瓷、有机金属化合物或其它不透明颗粒,无论这样的颗粒物是否赋予颜色。因此,尽管本说明书主要例示了对颜料着色剂的使用,但是术语“颜料”可以更普遍地用于不仅描述颜料着色剂,而且还描述其它颜料如有机金属化合物、铁氧体、陶瓷等。然而在一些实例中,所述颜料为颜料着色剂。
如本文中所用,“取代的”表示化合物或部分的氢原子被另一原子如碳原子或杂原子替代,其是被称为取代基的基团的一部分。取代基包括例如烷基、烷氧基、芳基、芳氧基、烯基、烯氧基、炔基、炔氧基、巯基烷基、巯基烯基、巯基炔基、巯基芳基等。
如本文中所用,“杂原子”指的是氮、氧、卤素、磷或硫。
如本文中所用,“烷基”指的是支链、无支链或环状饱和烃基团,尽管不是必需的,但是所述基团通常包含1至约8个碳原子。烷基包括但不限于例如甲基、乙基、正丙基、异丙基、正丁基、异丁基、叔丁基和辛基,以及例如环烷基如环戊基和环己基。如本文中所用,“取代的烷基”指的是被一个或多个取代基取代的烷基。术语“杂烷基”指的是其中至少一个碳原子被杂原子替代的烷基。如果没有另外说明,术语“烷基”包括未取代的烷基、取代的烷基和杂烷基。
如本文中所用,Tg是如通过以下福克斯方程(Fox equation)所计算的玻璃化转变温度:共聚物Tg = 1 / [Wa(Tg A) + Wb(Tg B) + …],其中Wa = 共聚物中单体A的重量分数且Tg A是单体A的均聚物Tg值,Wb = 单体B的重量分数且Tg B是单体B的均聚物Tg值等。
如本文中所用,术语“约”用于通过假设给定值可“略高于”或“略低于”端点来为数值范围端点提供灵活性。该术语的灵活性的程度可以通过特定变量指示并且将在本领域技术人员的知识之内以基于经验和本文中的相关描述确定。
如本文中所用,为了方便起见可使多个项目、结构要素、组成要素和/或材料呈现于共同的列表中。然而,这些列表应该被解释为如同该列表的每个成员被个体地确认为单独和唯一的成员。因此,在没有相反说明的情况下,这样的列表的个体成员均不应仅基于它们呈现于共同的组中而被解释为同一列表的任何其它成员的事实等同物。
本文中可以范围的格式表述或呈现浓度、量和其它数值数据。将理解的是这样的范围格式仅仅为了方便和简洁而使用,并且因此应该被灵活地解释为不仅包括作为范围界限而明确叙述的数值,而且还包括该范围内所涵盖的所有的单个数值或子范围,如同明确叙述了每个数值和子范围。作为例示,“约1重量%至约5重量%”的数值范围应该被解释为不仅包括明确叙述的约1重量%至约5重量%的值,而且还包括所指示的范围内的个体值和子范围。因此,在该数值范围中包括个体值如2、3.5和4,和子范围如1至3、2至4和3至5等。该相同的原则适用于仅叙述一个数值的范围。此外,无论范围的宽度或描述的特征如何,这样的解释均应该适用。
用于喷墨应用的水基白色墨水分散体通常遭受分散体不稳定性。高密度(~4.7)氧化钛(TiO2)(白色印刷墨水中常用的白色颜料)的聚集和沉降是针对分散体不稳定性挑战的主要原因之一。尽管可以通过使用低于50nm(sub-50nm)的氧化钛颜料来克服该挑战,但是难以达到所需的白色不透明度,这是因为不合需要的增加的颜料透明度。因此,在许多情况下可以使用约100至250nm的白色颜料。然而,增加的颜料尺寸导致了分散体不稳定性,和在一些情况下导致差的喷射性能。
“低密度”氧化钛
概括地,用于制造低有效密度的TiO2的方法描述于图1中。该方法100包括:
提供具有表面的模板105;
用可以在高温下分解(reduce)至TiO2的含钛化合物包覆模板表面110;和
除去模板,从而形成多孔TiO2颗粒115。
根据本文中的教导,可以通过使用具有较低有效密度的氧化钛(二氧化钛, TiO2)颜料抑制由于沉降造成的分散体不稳定性。目前市售的TiO2颜料具有超过4的密度。“低密度”二氧化钛表示具有小于4的密度的二氧化钛。在一些实例中,本文中教导的实践中使用的二氧化钛的密度为约2.5至3.8。在任何情况下,已经通过将多孔性引入二氧化钛颗粒中来降低二氧化钛的密度。因此,可以更准确说明的是该二氧化钛具有比市售的TiO2颜料更低的“有效”密度。
在一些实例中,模板可以是聚合物模板或氧气泡。关于用于制备低有效密度的TiO2的路线I和II,下面给出进一步的细节。
水溶性钛盐的实例包括但不限于可以在高温下分解至TiO2的含钛化合物。实例包括硫酸氧钛、二异丙氧基双(乙酰丙酮)钛、乙醇钛(IV)和四(二乙基氨基)钛(IV)(tetrakis-(diethylamido)titanium(IV))。如本文中所用,“高温”表示至少500℃的温度。
除去模板的步骤可以包括煅烧。煅烧步骤可在至少500℃的温度下进行至少5小时。当然,如在煅烧程序中惯常的,在一些情况下可以采用单一温度,或是采用单一时间或是采用时间的步进序列(stepped sequence)。在其它情况下,可以采用温度和时间的步进序列。常规实验将确定合适的煅烧程序以产生具有低有效密度的TiO2颗粒。
为了降低密度,已经开发出两种化学合成路线以获得具有较低有效密度的“多孔”TiO2颜料。对于具有约2.5至3.8的密度的二氧化钛,可能意味着级别为约50%左右的多孔性。图2和3各自分别描述了形成所需的低有效密度的TiO2颜料的合成路径,路线I和路线II。
图2显示了第一合成路径的示意图,其描述了获得低有效密度的多孔TiO2白色颜料的合成路线I(聚合物乳液 + TiOSO4•xH2SO4•xH2O)。路线I基于聚合物模板法并且依靠Ti4 +与羧基配位的趋势。可以制备具有羧基的聚合物乳液模板。 Ti4+在(步骤A)的表面上并且然后可以使用硫酸氧钛使Ti4+能够吸附在该表面上(步骤B)。然后可以除去该聚合物模板,例如通过煅烧(步骤C)。两种聚合物已经被用于制备该模板乳液,即聚(甲基乙烯基醚-交替-马来酸)( poly(methyl vinyl ether-alt-maleic acid))和A-C 5180乙烯-丙烯酸(EAA)聚合物。
在一个实例中,制备部分中和的聚(甲基乙烯基醚-交替-马来酸)的溶液1和A-C5180 EAA聚合物的溶液2。具体地,在该实例中,溶液1由100.7g 聚(甲基乙烯基醚-交替-马来酸)、54.9g的50% NaOH和758.1g水组成。溶液2由194g 可获自Honeywell Waxes(Morristown, NJ)的A-C® 5180树脂(乙烯-丙烯酸共聚物)、51.6g 50%的NaOH和580.5g水组成。溶液3由150g TiOSO4•xH2SO4•xH2O和850g水组成。
为了制备低密度的TiO2,将1.0g 溶液1、5.16g溶液2和20g水合并以形成对酸具有非常好的稳定性的聚合物乳液。接下来,添加40g 溶液3以形成稳定的Ti(IV)聚合物乳液混合物。使水蒸发,并且将所得固体在550℃下煅烧1小时然后在660℃下煅烧5小时。
表I显示出在前体3(硫酸氧钛(IV)的溶液)的存在下,1和2的不同混合物的稳定性。如下表I中所示,1是稳定的溶液并且其在3中是不稳定的,然而2在3的存在下是稳定的。在1的低重量百分数(<16.24%)下,可以获得在前体3的存在下稳定的聚合物乳液。
表I. 溶液1+2的混合物的稳定性
特定构造单元(building block)的聚合物模板可以提高低有效密度的颜料的浮性(buoyancy)。更具体地,重复单元为甲基乙烯基醚-交替-马来酸,并且端基为甲基的具有约70K至120K的分子量(Mn)的聚合物模板可以与低有效密度的TiO2颜料很好地起作用(work)。这样的聚合物分散剂的实例包括聚(甲基乙烯基醚-交替-马来酸)。表面活性剂如Joncryl HPD 671和E-sperse可具有与聚(甲基乙烯基醚-交替-马来酸)相似的效果。在一些实例中,这些表面活性的混合物对于低有效密度的TiO2颜料可以特别好地起作用。
图3例示了形成低有效密度的TiO2的替代路径的概念,称为路线II。使用该路线,氧气泡用作模板以合成具有低有效密度的多孔和中空的TiO2颜料。
下面显示用于获得低有效密度的TiO2颜料的化学反应顺序。
Ti4+ + H2O → TiO2+ + 2H+
TiO2+ + H2O2 → [TiO(H2O2)]2+
2H2O2 → 2H2O + O2↑
CO(NH2)2 + 3H2O → NH3•H2O → TiO(OH)2↓ + 2NH4 + + H2O2
TiO(OH)2 → TiO2 + H2O。
在合成TiO2中空球的实例中,将100.1g 硫酸氧钛(IV) (TiOSO4•xH2SO4•xH2O)缓慢引入至59mL的30% H2O2溶液、11.4g CO(NH2)2和33.6g 蒸馏水的混合物,在磁力搅拌的情况下形成特征性的亮橙色溶液。然后,过夜搅拌该混合物,并且使水蒸发以产生深棕色的发粘的混合物。将该混合物在550℃下煅烧1小时,然后在660℃下煅烧5小时以获得最终产物(TiO2中空球)。
从化学反应的角度来看,首先,Ti4+离子与H2O反应以形成TiO2+离子。然后TiO2+离子与H2O2配位以形成[TiO(H2O2)]2+离子。同时,H2O2分解为作为模板使用的O2气泡(步骤D)。接下来,由于气泡的超大的比表面积,经指定数量的循环[TiO(H2O2)]2+离子吸附至O2气泡的表面上(步骤E形成单层且步骤F形成多层)。随温度上升的同时,尿素水解并且它转化成与[TiO(H2O2)]2+反应以形成TiO(OH)2沉淀的氨水(NH3·H2O)。接下来,TiO(OH)2脱水以形成TiO2壳(步骤G)。
该结构形态不同于商用TiO2颜料的结构形态。基于简单的干质量-体积计算,已经确定TiO2颜料的有效密度降低了~35%。
用低有效密度的二氧化钛配制的墨水
基于如通过上面公开的方法之一所制备的具有低有效密度的合成后原样(as-synthesized)的TiO2颜料配制白色墨水分散体。在一些实例中,该颜料在研磨之后可以具有约100至300 nm的粒度。
高速高剪切磨碎机用于生产各种分散体。在典型的研磨过程中,在3,000至4,000rpm的速度下将低有效密度的TiO2颜料(5至25% NVS-非挥发性固体)与分散剂混合物混合约3小时。
研磨介质对平均颜料尺寸的影响显示于表II中,其中需要0.1mm以达到~280nm的颜料尺寸。通过ZETA-sizer来确定粒度。
表 II. 研磨介质对平均颜料尺寸的影响*
研磨珠的尺寸(mm) | 粒度(nm) |
0.5 | 1650 |
0.2 | 380 |
0.1 | 280 |
*墨水研磨基料:TiO2 1g;分散剂 0.5g;水 98.5g,研磨珠 100 cm3;研磨时间 3小时;研磨rpm 3,000。
经由平均粒度随时间的演变和颜料沉降的目视检查(visual inspection)监测分散体稳定性。表III显示在各个检查点处经由动态光散射对粒度的测量。令人有兴趣注意的是在至少45天的时期内,平均粒度保持相对恒定。此外,没有观察到白色颜料的可视沉降。
表 III. 作为时间的函数的粒度
时间(天) | 粒度(nm) |
0 | 287 |
15 | 291 |
30 | 285 |
45 | 287 |
白色颜料分散体可包含:约10至60 重量%的低有效密度的TiO2;约1至40 重量%的胶乳;和余量的分散介质。合适的胶乳的实例可包括苯乙烯-丙烯酸系胶乳、聚氨酯胶乳、聚乙酸乙烯酯、丙烯腈-丁二烯-苯乙烯(ABS)胶乳、丙烯酸系聚合物和聚(乙烯-丙烯酸)。
合适的分散介质的实例可包括水和低碳醇及其混合物。如本文中所用的“低碳醇”表示具有2至6个碳原子的醇,例如乙醇、丙醇、丁醇、戊醇和己醇及其异构体。
配制基于制备的经研磨的基料和胶乳纳米颗粒(即充当光学间隔物(opticalspacer))的存在的白色墨水分散体,并且用热喷墨印刷头针对可喷射性对其进行测试。胶乳和经研磨的基料的实例分别显示于表IV和VI中。经研磨的基料与胶乳一起的稳定性进一步显示于表V中,其中 U = 不稳定和S = 稳定。Tg为约20℃的胶乳(胶乳 3)被视为具有与经研磨的基料特别好的相容性。
表 IV. 胶乳的实例
胶乳* | 详情 |
1 | HP-787-M1 12A19W009,非常高的T<sub>g</sub> (>120℃)的胶乳,NVS = 31.3% |
2 | HPL 10046-139 (T<sub>g</sub> ~ 77℃) NVS = 20.2% |
3 | HPL 3212-84-1 (T<sub>g</sub> ~ 20℃) NVS = 21.5% |
4 | ROPAQUE™ ULTRA |
* 胶乳1至3的信息(每种胶乳中单体的重量百分数,其中Sty = 苯乙烯,BA = 丙烯酸丁酯,MAA = 甲基丙烯酸,HMA = 甲基丙烯酸己酯,EGDMA = 乙二醇二甲基丙烯酸酯):
HP-787-M1 12A19W009: Sty:BA:MAA:EGDMA= 90:5:4:1;
HPL 10046-139: Sty:HMA:MAA:EGDMA=20:73:6:1;
HPL 3212-84-1: Sty:BA:MAA:EGDMA=82.5:14:3:0.5;
可获自Dow Chemical Co. (Midland, MI)的ROPAQUE™ Ultra是为提供最有效的干遮盖(dry hiding)而设计的非成膜的合成颜料(不透明的中空球聚合物颜料)。
表 V. 经研磨的基料与胶乳一起的稳定性
墨水 | 颜料载量 | 胶乳 | 稳定性 | 稀释后的稳定性 |
1 | 5% | 1至3% | U | U |
2 | 5% | 2至3% | U | U |
3 | 5% | 4至3% | U | U |
4 | 5% | 3至3% | S | S |
5 | 10% | 3至5% | S | S |
6 | 5% | 3至2.5%;4至2.5% | S | U |
7 | 5% | 3至1%;4至4% | S | U |
表V显示墨水4和5在浓缩和稀释两者的条件下均是稳定的。这些墨水可适合于用作白色墨水。
表 VI. 经研磨的基料的实例
颜料载量(TiO<sub>2</sub>): | 15% | 14% | 14% | 12% |
HP胶乳 | 5.4% | 5.2% | 4.4% | 3.7% |
聚合物分散剂 | 0.0% | 0.0% | 0.4% | 0.3% |
E-sperse 100 | 2.3% | 2.2% | 2.2% | 1.8% |
J671 | 2.75% | 2.65% | 1.36% | 1.15% |
DF31 | 0.37% | 0.37% | 0.57% | 0.49% |
在表IV中,HP胶乳是在HP实验室开发并且合成的苯乙烯-丙烯酸系胶乳。E-sperse100是可获自Ethox Chemicals, LLC (Greenville, SC)的表面活性剂,J671是Joncryl®HPD 671,其是可获自BASF (Freeport, TX)的苯乙烯-丙烯酸系颜料分散树脂。DF31是可获自Ethox Chemicals, LLC (Greenville, SC)的DEFOAMER 31。
使用HP热印刷头评估喷射性能。在使用典型的发射条件,注意到该墨水分散体的良好的平均滴落速度(>10m/s)。还注意到在丝网印刷(screening process)期间延长发射的情况下不存在喷嘴板的粘闭。
如图4中所示,在墨水分散体的墨水通量为~100ng/300th的情况下观察到>50%的不透明度,其中100ng/300th表示每{分数(1/300)}th的英寸单元为100ng。图4显示不透明度随增加的墨水覆盖量的演变。不透明度是对阻挡光线穿过介质的程度的量度。对于基于白色颜料的墨水而言,> 50%的不透明度被认为是可接受的。
墨水的基本组成可以包括约10至60重量百分比(重量%)的上述的白色颜料分散体,约1至10 重量%的助溶剂,和高至10 重量%的各种其它组分,例如表面活性剂、生物杀灭剂、杀真菌剂、螯合剂、缓冲剂和抗结垢剂及其混合物。
可以使用的助溶剂的种类包括脂族醇、芳族醇、二醇、乙二醇醚、聚乙二醇醚、己内酰胺、甲酰胺、乙酰胺和长链醇。这样的化合物的实例包括脂族伯醇、脂族仲醇、1,2-醇、1,3-醇、1,5-醇、乙二醇烷基醚、丙二醇烷基醚、聚乙二醇烷基醚的高级同系物(C6-C12)、N-烷基己内酰胺、未取代的己内酰胺、取代和未取代的甲酰胺两者、取代和未取代的乙酰胺两者等。可以使用的溶剂的具体实例包括2-吡咯烷酮、衍生的2-吡咯烷酮,其包括1-(2-羟乙基)-2-吡咯烷酮,2-甲基-1,3-丙二醇、四甘醇和乙基羟基丙二醇(EHPD),仅举几例。
如墨水制剂领域中的技术人员已知的,还可以使用许多表面活性剂中的一种或多种,并且所述表面活性剂可以是烷基聚环氧乙烷、烷基苯基聚环氧乙烷、聚环氧乙烷嵌段共聚物、炔属聚环氧乙烷、聚环氧乙烷(二)酯、聚环氧乙烷胺、质子化的聚环氧乙烷胺、质子化的聚环氧乙烷酰胺、聚二甲基硅氧烷共聚醇、取代的氧化胺等。使用的优选表面活性剂的具体实例包括SOLSPERSE、TERGITOL、DOWFAX等。如果包含,添加至制剂的表面活性剂的量可以为0.01重量%至10.0重量%。
添加以抑制有害微生物的生长的添加剂的实例可以包括生物杀灭剂、杀真菌剂和其它抗微生物剂,其在墨水制剂中惯常使用。合适的抗微生物剂的实例包括但不限于NUOSEPT、UCARCIDE、VANCIDE、PROXEL及其组合。
可以包含螯合剂如EDTA(乙二胺四乙酸)以消除金属杂质的有害作用。如果存在,这样的螯合剂通常地占喷墨墨水组合物的0.01 重量%至2 重量%。还可以存在粘度改进剂,以及本领域技术人员已知的其它添加剂以视需要改进墨水的特性。这样的添加剂可以0 重量%至20 重量%存在于喷墨墨水组合物中。
各种缓冲剂或pH调节剂也可以任选用于本发明的喷墨墨水组合物中。典型的pH调节剂包括这样的pH控制溶液,如碱金属的氢氧化物和胺,例如氢氧化锂、氢氧化钠、氢氧化钾;柠檬酸;胺,例如三乙醇胺、二乙醇胺和二甲基乙醇胺;盐酸;和其它碱性或酸性组分。如果使用,pH调节剂通常占喷墨墨水组合物的小于约10 重量%。同样,可以使用的缓冲剂例如但不限于TRIS、MOPS、柠檬酸、乙酸、MES等。如果使用,缓冲剂通常占喷墨墨水组合物的小于约3 重量%,并且通常为约0.01 重量%至2 重量%,更常见为0.2 重量%至0.5 重量%。
可以使用的抗结垢剂包括磷酸锂、磷酸钠、脂肪醇烷氧基化物的磷酸酯等,以约0.01 重量%至5 重量%的量。
该白色墨水体系可以具有以下优点,包括在使用商用分散剂情况下高的抵抗沉降的颜料分散体稳定性,可接受水平的白色不透明度,和热印刷头(10至40ng的笔)的所需喷射条件内可靠的喷射。
Claims (3)
1.包含白色颜料分散体的喷墨墨水,所述墨水包含:
10至60 重量%的白色颜料分散体,所述白色颜料分散体包含:
10至60 重量%的有效密度在2.5至3.8范围内的TiO2,
1至40 重量%的胶乳,和
余量的分散介质;
1至10 重量%的助溶剂;和
至多10 重量%的组分,所述组分选自表面活性剂、生物杀灭剂、杀真菌剂、螯合剂、缓冲剂和抗结垢剂及其混合物,
其中所述TiO2具有从大于100 nm到300 nm范围内的粒度。
2.- 根据权利要求 1 所述 的喷墨墨水,其中所述胶乳选自苯乙烯-丙烯酸系胶乳、聚氨酯胶乳、聚乙酸乙烯酯、丙烯腈-丁二烯-苯乙烯(ABS)胶乳、丙烯酸系聚合物和聚(乙烯-丙烯酸)。
3.- 据权利要求 1 所述 的喷墨墨水,其中所述分散介质选自水和具有2至6个碳原子的醇及其混合物。
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US20160221836A1 (en) | 2016-08-04 |
US9981857B2 (en) | 2018-05-29 |
WO2015047306A1 (en) | 2015-04-02 |
EP3049482A4 (en) | 2016-09-28 |
EP3049482B1 (en) | 2019-09-04 |
BR112016006612B1 (pt) | 2022-06-21 |
CN105593312A (zh) | 2016-05-18 |
EP3049482A1 (en) | 2016-08-03 |
US9878920B2 (en) | 2018-01-30 |
BR112016006612A2 (pt) | 2017-08-01 |
US20180072585A1 (en) | 2018-03-15 |
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