纳米钛酸钡颗粒砂磨分散工艺研究

本文研究了使用砂磨机进行纳米颗粒分散时的流量设定和磨球选择。为了确保砂磨过程中磨球不会逸出或者聚集在砂磨机的一端，浆料在研磨腔体中的上升速度应小于浆料液面上升速度，因此使用不同粒径的磨球都有最大限制流量。研磨过程的分散效率采用田中粉碎方程进行计算，结合实验结果可以计算出被粉碎钛酸钡颗粒的粉碎强度，结合分散效率的曲线可计算出适当的磨球粒径，实验中要达到较高的分散效率，所需的磨球粒径为0.08～0.10mm。     

水性悬浮体系的工艺探讨

水悬浮体系的制备过程中,立式砂磨机和卧式砂磨机是目前普遍使用的关键设备,其加工过程对产品的储存物理稳定性影响很大。为了研究了这两类砂磨机和研磨时间对悬浮体系研磨效率及贮存物理稳定性的影响,我们进行了一系列实验对比,结果表明,通过延长研磨时间,可以降低悬浮体系中颗粒的平均粒径和粒径分布（粒径〈3μm的百分比）,提高悬浮体系粘度,从而改善悬浮体系的物理稳定性。在相同条件下,卧式砂磨机的研磨效率比立式砂磨机的要高。     

分散染料后处理工艺对粒径影响研究

本文着重研究了分散红斑Ｓ－５ＢＬ在实验室和生产用砂磨机中，砂磨工艺各参数以及后处理工艺条件对粒径及其分布的影响，探讨了砂磨工艺条件对粒径及其分布的关系。     

德国研磨分散技术

<正>OMEGA~经济型分散机特点●有效分散粒子和色素的团聚●小粒径以及狭窄的粒径分布●显著降低了分散期间温度的上升●可再生的产品质量●清洗方便和产品更换快速●温和分散●适应高、低粘度的产品●高产量、低能耗以及低维护成本●结构紧凑(更好地节省空间)高速砂磨机ZETA~LMZ特点●高能密度(2 kW/dm~2)销棒式砂磨机,具有较小的长度/直径比例●设计适用于大流量生产(连续式或循环式)●产品粒径分布窄●砂磨机分离系统效率高●可使用小的研磨珠子小粒径为90μm●研磨简体的材料可根据耐磨性,耐腐蚀性的要求加以更换     

不同研磨料介质在砂磨机中的研磨效果

砂磨机依靠圆周速度约为10m/s的高速旋转叶轮激烈地搅拌砂磨机中的珠状研磨介质和漆浆,产生强有力的剪切作用,使颜料分散到漆料之中,制成细度符合要求的涂料。因此在涂料的生产过程中,砂磨机中选用何种研磨介质甚为重要。研磨介质的研磨效果与其成份、密度、粒径和强度等因素有关。本文着重介绍三种不同成份研磨介质的分散效果。     

分散染料后处理工艺对粒径影响研究

本文着重研究了分散红玉S-5BL在实验室和生产用砂磨机中,砂磨工艺各参数以及后处理工艺条件对粒径及其分布的影响,探讨了砂磨工艺条件对粒径及其分布的关系.     

水性分散体系超微粉碎研磨工艺探讨

以炭黑为分散相制备水性分散体系,通过研究不同类型砂磨机、研磨方式和研磨量对研磨效果及研磨效率的影响,提出了一种适合规模化、大批量超微粉碎研磨的多级组合研磨工艺。关键词：水性分散体系;超微粉碎;炭黑;砂磨机;研磨工艺     

砂磨机在分散染料后处理中的应用

我厂自一九七○年开始生产分散染料,其品种有:分散黄RGFL、分散红3B和分散蓝2BLN。目前年产量约350吨。染料后处理中的砂磨采用两种形式:砂磨机砂磨和砂磨锅砂磨。分散黄1970年开始采用砂磨机砂磨,现已有十余年历史。分散蓝1981年开始采用砂磨锅与砂磨机相结合的形式进行砂磨。现将砂磨机在分散染料后处理中的应用情况汇报如下:一、砂磨机在分散黄染料后处理中的应用及改进分散黄1970年采用砂磨机进行砂磨,起初是齿轮泵打料连续砂磨,砂磨时间长,一机料约     

SB-20砂磨机分散效果的提高

简述了SB 2 0砂磨机的原理 ,影响砂磨机分散效率的因素 ,以及提高砂磨机分散效果的途径。     

卧式砂磨机制备硫化包在乳胶行业的应用

乳胶行业分散体的研磨,基本采用单种分散体,立式研磨。但生产的混合硫化包粒径大,操作繁琐。利用卧式砂磨机采用高速锆珠研磨,细化胶乳硫化包(分散体)物质粒径,从而提高安全套等薄制品产品质量。同时比对市场售卖胶乳硫化包,从粒径,产品性能上比较,得出结论。     

分散剂对红色颜料分散体系稳定性的影响及其在白板笔墨水中的应用

以高分子化合物——聚乙烯醇缩丁醛(PVB)、聚氧乙烯聚氧丙烯嵌段共聚物(F68)、聚乙烯吡咯烷酮(PVP)及其分别与非离子型表面活性剂脂肪醇聚氧乙烯醚(AEO-6)复配作为分散剂,研究不同分散剂对醇溶性白板笔墨水红色颜料分散体系稳定性的影响。通过离心分离-吸光度测试、粒径分析判断其稳定性;通过流变性测试探究高分子化合物与AEO-6之间的作用关系。将稳定性好的分散剂用于制备红色白板笔墨水,并通过流变性测试、粒径分析表征墨水的稳定性能。结果表明,采用3种高分子分散剂的红色颜料分散体系稳定性好,且添加质量分数为1%PVB的体系稳定性最佳。在高分子分散剂与AEO-6复配分散的颜料体系中,高分子分散剂对体系稳定性起主导作用,AEO-6并没有起到明显的作用。在红色白板笔墨水中,PVB分散的墨水体系稳定性最佳,此结果与红色颜料分散体系相一致。     

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.     

Preparation of cationic pigment dispersions by surface grafting of polystyrene‐maleic anhydride with glycidyltriethylammonium chloride

Novel cationic pigment dispersions, which have potential uses in inkjet inks and coloration of textile and paper, were prepared by grafting quarternary ammonium groups onto the surface of polystyrene‐maleic anhydride encapsulated C. I. pigment yellow 14 (PY 14) powder. It is shown that the Zeta potentials greatly rely on the reaction time and temperature. And also, when the weight ratio of glycidyltriethylammonium chloride (GTA) to encapsulated PY 14 powder was 3 : 1, the Zeta potential of modified pigment dispersion reached to + 35.05 mV. Just due to the high Zeta potential of the prepared cationic pigment dispersions, the prepared cationic pigment dispersion shows good dispersion stability and a narrow size distribution with the average particle size of 202.9 nm. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

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.     

Preparation of styrene‐maleic acid copolymers and its application in encapsulated pigment red 122 dispersion

Styrene‐maleic acid copolymers were synthesized by free radical polymerization. Encapsulated pigment red 122 dispersions were prepared by sedimentation with these copolymers. Effects of copolymer structure such as molar content of maleic acid, molecular weight, and the amount of copolymers on stability and particle size of dispersion were investigated. The results showed that encapsulated pigment dispersion with higher stability, smaller particle size, and narrower particle distribution could be achieved when the molar content of maleic acid was at 0.43 and the intrinsic viscosity was at 79.65 ml/g with amount of copolymers 10%. The encapsulated layer was about 5 nm which could be observed by TEM. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

The use of new blockcopolymeric dispersing agents for waterborne paints — theoretical and practical aspects

Newly developed blockcopolymeric dispersing agents are evaluated in their performance with a number of pigments in order to obtain a deeper understanding of the dispersing process and of the factors that affect the stability of waterborne binder free pigment concentrates. Special attention is paid to the variation of the amphiphilic ionic/non-ionic and hydrophobic/hydrophilic properties of these new dispersants. By measuring particle surface charges and particle size distributions of pigment pastes and by determining relevant properties of the films obtained after application the effect of a number of binders and other paint components on the stability of dispersions is also evaluated. Guidelines for efficient and economically optimum preparation of pigmented waterborne paints are given.     

Optical characterization of concentrated dispersions: applications to laboratory analyses and on‐line process monitoring and control

Light scattering methods are often used to study the stability of suspensions or emulsions and to estimate the dispersed phase properties such as particle size and volume fraction. However, such optical methods often require a previous dilution of the dispersion because of a limited measurement range, and are then unable to give information about the real physical state of dense heterogeneous media. A new technology based on multiple light scattering analysis and called Turbiscan has been recently developed by a French company, Formulaction, to fill this gap and to characterize both diluted and concentrated dispersions. In the first part, we review the physical concepts of multiple light scattering by dispersions. In relation to the optical analyser Turbiscan, we present physical and statistical models for the radiative transfer in dense suspensions. In the second part, we investigate the influence of particle volume fraction and particle size (polystyrene latex bead suspensions) on the backscattered and transmitted light fluxes measured by Turbiscan. The experimental data are compared with results from the physical models. In the last section, we use the optical analyser Turbiscan Lab to detect and characterize various concentrated dispersions destabilization (coalescence, flocculation, creaming and sedimentation), and then the Turbiscan On Line to monitor and characterize an emulsification process under ultrasonic agitation. Copyright © 2004 Society of Chemical Industry     

Group transfer polymerization and its use in water based pigment dispersants and emulsion stabilizers

Group transfer polymerization (GTP) can be used to make AB diblock acrylic polymers. It provides excellent control of the structure of these polymers. With a hydrophilic B block, these polymers have been used to prepare water based emulsions, pigment dispersions, and slurries. These systems have property advantages over emulsions and dispersions made with conventional stabilizers. These advantages include increased stability, smaller particle sizes, lower viscosities, and less moisture sensitivity. The structure of the AB diblock polymer affects the properties of both the pigment dispersion and the emulsion particle. The composition, size and ratio of each block affect the overall quality. For aqueous systems, a balance of hydrophobic ‘A’ blocks and very hydrophilic ‘B’ blocks is needed for optimum properties. The hydrophobic ‘A’ blocks, which are homo or copolymers of methacrylate monomers (such as butyl or ethylhexyl methacrylate), are surface active and can associate with either pigment or emulsion polymer surfaces. The hydrophilic ‘B’ blocks, which are neutralized acid or amine containing copolymers, provide both ionic as well as steric stabilization in water-borne systems.     

可聚合阳离子表面活性剂DMDB的合成及在颜料分散中的应用

以甲基丙烯酸二甲胺乙酯和1-溴代十二烷为原料,吩噻嗪为阻聚剂,在50℃恒温反应20 h,合成了可聚合阳离子表面活性剂——甲基丙烯酰氧乙基十二烷基二甲基溴化铵(DMDB),用FTIR、1HNMR对其结构进行了表征,研究了其水溶液的性质。以DMDB为分散剂,用超声波粉碎法制备了超细颜料分散体系,考察了DMDB质量分数分别为0.1%、0.3%、0.5%、0.7%、1%时超细颜料分散体系的性能,结果表明,当w(DMDB)≥0.3%时,分散体系的粒径小于300 nm,Zeta电位在25 mV左右,具有较好的离心稳定性。     

Preparation of nanoscale azo pigment yellow 13/poly(styrene–maleic acid) composite dispersions via free‐radical precipitation polymerization

Nanoscale azo pigment yellow 13 (PY13) was coated by poly(styrene–maleic acid) (PSMA) with a free‐radical precipitation polymerization, followed by the preparation of the dispersion. The effects of the PSMA structure on the particle size and centrifugal stability were investigated. The experimental results revealed that the particle size was large, and the stability of the PY13/PSMA dispersions was high when the molar ratio of the feeding maleic acid to styrene, the weight ratio of the feeding initiator to monomer, and the weight ratio of the feeding monomer to pigment were about 1.0, 0.6, and 20%, respectively. Fourier transform infrared spectroscopy, dynamic light scattering, and transmission electron microscopy indicated that PY13 was coated by PSMA. The PY13/PSMA dispersion was stable in the pH range 5.6–10.5. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010