超支化分散剂与表面活性剂复配对颜料分散体系的影响

超支化聚合物的合成与应用是目前研究的热点.应用自制的超支化分散剂(Hyperb舢ched dispersant,HPD)与不同的表面活性剂复配,制备水性颜料分散体系,研究其他表面活性剂种类、超支化分散剂与表面活性剂比例等条件对颜料分散体系的粒径及其分布、离心、稳定性等性能的影响.实验结果表明:超支化分散剂与非离子表面活性剂复配比为7:3、与阴离子表面活性剂复配比为6:4时,体系的分散性和稳定性较好.超支化分散剂与阴离子分散剂复配效果较好.     

超分散剂对紫色中性墨水颜料分散影响及应用

研究了超分散剂聚环氧乙烷-稠环芳烃嵌段共聚物的用量、研磨时间对颜料紫23粒径、热稳定性及离心稳定性的影响.通过TEM观察墨水微观分散状态,并结合FTIR分析分散剂对颜料紫23的作用机制.结果表明:添加质量分数为15％的超分散剂,2500 r/min研磨2.5 h,紫色色浆粒径可达138 nm,且稳定性最佳.该分散剂与颜料紫23的吸附作用推动力应为分散剂的疏水基团(稠环芳烃)与颜料紫23结构中苯环结构通过 π-π堆积作用发生吸附,从而引起C—H键的红外吸收发生变化.用自制紫色色浆调制的中性墨水,触变值为5.48,符合行业标准,该墨水长期储存性、线条落墨情况、耐水性均较好.     

中性墨水颜料吸附性与分散稳定性研究

中性墨水的流变性和颜料分散稳定性是影响中性墨水品质的两个重要因素,这两个因素又直接受到分散树脂、增稠剂种类与稳态吸附量的影响。本文考查了不同颜基比下增稠剂吸附颜料粒子的量对墨水表观黏度及触变值的影响,并在理想条件下,选择复配碱溶胀型增稠剂对墨水流变性和稳定性进行研究。结果表明,分散树脂与增稠剂对颜料粒子存在动态竞争吸附;当墨水体系中颜基比为3:1,借助0.4% ALCOGUARD 5800与1.0% T-938复合增稠,所制备的中性墨水具有良好的流变性能与分散稳定性。     

超分散剂对紫色中性墨水颜料分散影响及应用

研究了超分散剂聚环氧乙烷-稠环芳烃嵌段共聚物的用量、研磨时间等对颜料紫23粒径、热稳定性及离心稳定性的影响。通过TEM观察墨水微观分散状态,并结合FTIR分析分散剂对颜料紫23的作用机制。结果表明：添加质量分数为15%的超分散剂,2800r/min研磨2.5h,紫色色浆粒径可达138nm,且分散稳定性最佳。该分散剂与颜料紫23的吸附作用推动力应为分散剂的疏水基团（稠环芳烃）与颜料紫23结构中苯环结构通过π-π堆积作用发生吸附,从而引起C—H键的红外吸收发生变化。用自制紫色色浆调制的中性墨水,触变值为5.47,符合国家标准,该墨水长期储存性、线条落墨情况、耐水性均较好。     

高分子分散剂对UV喷墨色浆分散稳定性的影响

为提高UV喷墨色浆的分散稳定性,对比研究了聚酯型和丙烯酸嵌段型高分子分散剂对UV喷墨色浆的颜料平均粒径、粒径分布、耐热稳定性及离心稳定性的影响。结果表明,当分散剂质量为颜料质量的20%时,UV喷墨色浆的分散稳定性较好。添加聚酯型分散剂和丙烯酸嵌段型分散剂的UV喷墨色浆粒径分别为207 nm和144 nm,颜料粒径分布指数(PDI)分别为0.312和0.200。加热5 d后,含聚酯型分散剂和丙烯酸嵌段型分散剂的UV喷墨色浆颜料平均粒径分别增加为原来的1.89倍和1.04倍。2种UV色浆的离心稳定性均在85%以上。     

陶瓷表面装饰墨水的制备研究

采用分散剂NNO与聚羧酸类化合物作为分散剂,以水为介质,通过砂磨分散研制无机颜料墨水,研究了该混合分散剂的比例,添加剂及含固量对无机颜料墨水性能的影响,经测试,所制墨水的粒径、粘度、表面张力等指标完全符合喷墨打印墨水的要求,其中黑色墨水的着色剂含量可达20%,打印于陶瓷上,经煅烧显色正常.     

水性黑色陶瓷墨水的稳定性研究

采用研磨分散法制备了水性黑色陶瓷墨水,主要研究溶剂含量和分散剂种类对陶瓷墨水性能的影响,同时对不同厂家生产的分散剂种类进行筛选。选出溶剂、分散剂在最佳分散效果时的添加量,进一步考查溶剂和分散剂对陶瓷墨水粒径的影响,从而对陶瓷墨水配方进行优化。测试结果表明:制备的水性黑色陶瓷墨水在30天内不发生分层,保持良好的稳定性。     

白板笔黑墨水的研制

使用均匀设计方法进行白板笔黑墨水的配方优化,并且采用炭黑颜料制备剂,与聚乙烯醇缩丁醛来调整墨水的粘度,采用保湿剂SY-7,S-80复配来调整墨水的脱帽时间,采用BOP与CMD-370来解决擦净率.将白板笔墨水的生产过程中预分散、砂磨、高压均质机进行优化组合.     

中性墨水用碳黑色浆的分散稳定性

通过分散剂的筛选,研制了配置中性笔墨水的水性碳黑色浆. 提出了用于表征碳黑色浆分散稳定性的离心分离-吸光光度方法,并初步实验验证了其可行性. 优化了分散剂的用量,并研究了砂磨时间对色浆存储稳定性的影响. 结果表明,具有芳环结构的高分子嵌段共聚物是制备碳黑水性色浆的优良分散剂. 以碳黑颜料为基准,当苯乙烯-马来酸酐树脂铵盐溶液分散剂用量为20%、砂磨2 h时,得到平均粒径为117.1 nm的碳黑色浆,放置15 d后平均粒径为160.0 nm,具有较优的存储稳定性,以此色浆制备的中性墨水具有良好的存储稳定性和书写性能.     

中性墨水颜料的吸附性与分散稳定性

考察了不同颜基比下增稠剂添加量对墨水表观黏度及触变值的影响和复配碱溶胀型增稠剂对墨水流变性和稳定性的影响。结果表明,分散树脂与增稠剂对颜料粒子存在动态竞争吸附;当墨水颜基比为3∶1,添加占体系总质量0.4%的ALCOGUARD 5800(增稠剂A)与1.0%的T-938(增稠剂B)复合增稠时,所制备中性墨水的流变参数为:触变环面积1 478.30 Pa/s,屈服应力5.19 Pa,触变值4.03,均与日本米库尼墨水参数相当,且离心稳定性系数为96.7%,恒温加热微观分散均匀。     

Preparation and characterization of waterborne ceramic ink with submicron-sized praseodymium-doped zirconium silicate pigment by water-based diblock polymer dispersants

Two diblock polymer dispersants (i.e., PMAA-b-AMPS and PSSS-b-GMA) were synthesized and used as water-based dispersants for dispersion and stabilization of waterborne ceramic ink with submicron-sized praseodymium-doped zirconium silicate (Pr-ZrSiO₄) pigment. The color property, dispersion, and stability of the pigment particles in aqueous suspension were determined by colorimetry, laser particle size analysis, and sedimentation test. The adsorption mechanism of carbon chains of dispersants on the particle surface was analyzed by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and electrokinetic potential measurement. Also, the viscosity, surface tension and stability of waterborne ceramic ink with the pigment particles were measured by rheometry, surface tension analysis and standing settlement. The results show that the submicron-sized pigment particles in waterborne ceramic ink show optimum dispersibility and stability at 5 wt% addition of diblock polymer dispersants PMAA-b-AMPS and PSSS-b-GMA mixed in a mass ratio of 9:1. This could be since the mixed dispersants provide the more interparticle electrostatic repulsion and steric hindrance energies due to the proper adsorption on the particle surfaces. It is indicated that adding 20 wt% of diethylene glycol monobutyl ether into the waterborne ceramic ink can effectively enhance the viscosity and reduce the surface tension, thus satisfying the applied requirements in inkjet printing. In addition, the jettability of waterborne ceramic ink on a simulated ceramic green body was also evaluated based on semi-empirical analysis.     

Deflocculants for tape casting of TiO2 slurries

Five dispersants, polycondensed fatty acid, castor oil, phosphate ester, polyvinyl butyral (B79), polyvinyl butyral (B98) are used as dispersant. The dispersability of TiO₂ slurries is studied through ESA measurement, rheological characterization and FTIR test. ESA measurement shows that the adsorption of PVB79 and phosphate ester is of physical and chemical type, respectively. Rheology, TG–DTA and sedimentation measurements show that in the absence of binder, PVB79 is the best dispersant; after the addition of binder, phosphate ester is the best one. The adsorption of dispersants on powder surface is also characterized by FTIR. The dispersion and stability mechanism is discussed.     

水性油墨分散技术研究进展

结合国内外研究现状,对水性油墨的分散稳定机制、影响分散性的主要因素进行了综述分析,分析表明:颜料自身的可润湿性、粒径及粒径分布、树脂的特性、油墨的黏度及p H值都与水性油墨的分散性密切相关。在此基础上,阐述了提升分散性及分散稳定性的主要途径,包括对颜料进行表面改性处理、使用表面活性剂或超分散剂、设计颜料表面形貌及进行颜料预分散。并提出:随着国家产业调整的进一步深入,环保型水性油墨必将逐步取代传统溶剂型油墨,进一步提升水性油墨的质量已是当务之急。     

Synthesis of reactive self-adhesive branched polyurethane dispersant for textile pigment printing

A series of reactive branched polyurethane dispersants (BPUs) were successfully synthesized based on epoxy as reactive group and nitrogen-containing heterocycles as anchoring group. The branched polyurethane was adopted an ''A₂ + B₃'' approach with diisocyanate prepolymer and trimethylolpropane. The structure, molecular weight, and thermodynamic property of BPUs were characterized. The pigment dispersions were prepared with BPUs as the dispersant by ball milling, and then the characteristic parameters such as pigment particle size, viscosity, stability, color properties, and fastness were evaluated. Excellent dispersing performances were observed that the particle size of five dispersions were below 200 nm, with the viscosity as low as 6–9 mPa·s. It is worth noting that the pigment dispersion prepared by BPU exhibited excellent stability and self-adhesive performance. These dispersions were printed on cotton fabrics without adhesives, their water washing fastness was approximately grade 4. And the dry rubbing and wet rubbing fastnesses were 3 and 2–3, respectively.     

Influence of different dispersants on the quality and stability of aqueous quinacridone magenta pigment dispersion for ink-jet applications

The stability of water-based pigment dispersions is a key factor in determining their utility in ink-jet applications, and the appropriate choice of dispersant plays a special role. Among the pigment formulations tested to date, literature data on magenta pigments are very limited. Thus, the goal of this work was to study the influence of the type and loading of dispersants on the quality and stability of quinacridone magenta pigment dispersions. Three different commercially available dispersants were tested: (1) a cationic styrene-maleic anhydride copolymer, (2) an anionic polyacrylate, and (3) a nonionic alkyl ethoxylate. Pigment and dispersing agents were analysed using the Fourier Transform–infrared method. The stability of pigment dispersions was determined by comparative studies of changes in the pigment particle size, viscosity, pH, filtration time, optical density and gloss during the accelerated ageing test. Moreover, Turbiscan AGS and LUMiFuge analysers were used for evaluations of the instability of the dispersions. The properties of each dispersing agent affected the performances of the different dispersants. The highest stability for the pigment formulations was provided using the nonionic dispersant (small particle size, < 60 nm; the lowest viscosity < 60 mPa·s at the optimal dispersant content; favourable results of the filtration test; the highest pigment dispersability, proven by optical density and gloss). The Turbiscan AGS and LUMiFuge results indicated that the stability of all tested quinacridone magenta pigment dispersions was excellent (Turbiscan Stability Index values below three, and no significant differences in transmission profiles, respectively). However, it was found that the measurement results were influenced by the viscosity of the formulations.     

Shear rate-dependent structure of polymer-stabilized TiO2 dispersions

Opacity, gloss, stability, color acceptance, and other paint properties depend on the quality of pigment dispersion. We measured the shear rate-dependent structure of titanium dioxide (TiO₂) dispersions stabilized with commercial polymer dispersants in water. Two different MW polyacid dispersants and two different MW acrylate copolymers were used in this study. The experiments were conducted at the NIST Center for Neutron Research on the perfect crystal diffractometer for ultra-high resolution small-angle neutron scattering (USANS) measurements. The results for TiO₂ scattering and rheology show that shear induced dissociation occurs for certain dispersants and shear induced association of TiO₂ clusters is observed for other dispersants. The results suggest new ways to consider dispersant selection for paints and the quality of pigment dispersions.     

新型白板笔墨水的研制及性能优化

以聚乙烯醇缩丁醛树脂和丙烯酸树脂为成膜物质,以乙醇、异丙醇、乙酸丁酯等为溶剂,制得一种高性能白板笔墨水。考察了树脂配比、溶剂配比、润滑剂、pH值、表面活性剂等因素对墨水的稳定性、快干性、书写性能、可擦性及气味等性能的影响。通过两种树脂的复配,解决了单一树脂的涂膜发白、裂纹等缺点。实验发现,当树脂为墨水质量的6%,润滑剂1%,表面活性剂1%,pH值为4~5,乙醇∶异丙醇∶乙酸丁酯的质量比为7∶11∶2时,墨水的各项性能均较好。     

Influence of nano‐coated pigment ink formulation on ink‐jet printability and printing accuracy

Pigment ink was formulated with nano‐coated pigment dispersion, prepared via mini‐emulsion polymerization. To study the effect of nano‐coated pigment, surfactant and humectant on ink‐jet printability, the trajectory of droplets with different pigment ink composition was monitored. The effect of ink formulation on the accuracy of printing process of the pigment ink was discussed by study on line width and edge contour of printed patterns. Experimental results indicated that the additives and properties of the pigment ink had a great influence on droplet formation and precise positioning of the printed patterns. The optimal composition for the pigment ink as following: nano‐coated pigment dispersion was 20% w/w, surfactant (S‐465) was 1.5% w/w, humectant (diethylene glycol) was 30% w/w and defoamer (FB‐50) was 0.1% w/w. The prepared pigment ink exhibited excellent freeze–thaw, thermal and centrifugal stability. In addition, the optimal formula was beneficial to form a stable droplet and obtain high precision patterns.     

30%三唑锡悬浮剂的研制及作用机理分析

[目的]解决30%三唑锡悬浮剂分散稳定性的问题。[方法]为提高30%三唑锡悬浮剂分散稳定性,采用流点法对不同类型的分散剂进行初步筛选并测试表面张力,通过测试SC粒径、Zeta电势、悬浮率、流变性能确定分散剂配比与用量并对分散稳定机理进行分析。[结果]与单一分散剂制备SC相比,聚羧酸盐分散剂SD-816和聚氧乙烯醚磷酸酯分散剂SD-208复配体系制备的SC性能较优,其表观黏度、Zeta电势、粒径和悬浮率分别为386 mPa·s、-37.2 mV、2.58μm及98.4%。并且提出了聚羧酸盐分散剂和聚氧乙烯醚磷酸酯分散剂对农药三唑锡可能的分散机理。[结论]聚羧酸盐SD-816和聚氧乙烯醚磷酸酯SD-208的复配体系可同时提供静电排斥作用和空间位阻,明显改善SC体系的悬浮稳定性。     

MgO超细颗粒水分散体系的稳定性研究

研究了影响MgO颗粒在水介质中的分散稳定性的因素,并通过降沉实验和测定颗粒的Zeta电势、颗粒粒度以及分散剂在颗粒/水界面的吸附等温线等来解释相关机理。研究发现,阴离子表面活性剂SDS和阳离子表面活性剂CTAB能够吸附在颗粒/水界面,提高颗粒表面的Zeta电势,增加颗粒间静电排斥效应,从而阻碍颗粒间发生絮凝,提高体系的分散稳定性。而阳离子高分子聚合物聚乙烯亚胺(PEI)在颗粒表面形成多点吸附,从而阻碍其它PEI分子在颗粒表面的吸附,对MgO微粒分散体系的稳定性贡献较小。