钛白粉在溶剂型涂料中分散性的研究

从钛白粉表面性质出发 ,研究了钛白粉在溶剂型涂料中的分散机理 ,分析了影响钛白粉分散性的因素和提高分散性的途径。     

表面处理剂对钛白粉在丙烯酸涂料中性能的影响

通过不同的有机表面处理剂对钛白粉进行有机包覆,并以其制备溶剂型涂料。采用高速分散和混合振荡法,考察了丙烯酸树脂体系中钛白粉的分散性、分散稳定性以及遮盖力等应用指标。对比实验表明,不同的有机表面处理剂对钛白粉在丙烯酸树脂体系中性能有较大影响,其中经过有机处理后的R2钛白粉在此体系中性能较好,能够达到国外同类产品的应用性能指标。     

清洁涂装工艺的探讨

本文结合清洁涂装工艺，探讨了水性环保型涂料的应用，简述了水性涂料生产施工设备易清洗、颜料分散性较溶剂型差、表面张力较溶剂型高、水分蒸发慢等特点，并介绍了水性涂料特殊的施工要求及其在木制品、塑料制品和汽车制造方面的涂装。     

有机改性钛白粉效果及对涂料性能影响

采用醇类有机剂对金红石型钛白粉进行有机表面改性，实验研究不同醇类改性剂对钛白粉改性效果。并评价改性钛白粉在涂料体系中分散性、遮盖力、光泽等影响。实验结果表明：采用改性钛白粉R3产品粉体指标、分散稳定性及涂料体系性能均较好。通过红外光谱表征，有机改性剂在钛白粉表面形成包覆。     

表面处理条件不同对锆铝包覆类型钛白粉产品质量的影响

从无机包覆条件和不同的有机处理方式,研究了锆铝包覆类型的钛白粉,对产品质量的各影响因素,特别是引起吸油量指标偏高的因素,做出了评价。结果表明,打浆分散剂的选择、无机包覆量和无机处理选择合适的条件,有机处理使用硅烷偶联剂能够在溶剂型涂料和油墨中获得卓越的吸油量和良好的分散性。     

行业快讯

国家质检总局公布溶剂型木器涂料产品抽查结果;2008年全球钛白粉市场需求达510万t     

水性涂料中钛白粉颜料性能与应用性能的关系研究

通过实验研究了水性涂料配方和钛白粉颜料体积浓度的关系,系统研究了钛白粉消色力、亮度及分散性等性能指标对水性涂料涂膜遮盖力、光泽和耐候性的影响。结果表明：当加入水性涂料的钛白粉颜料性能较高时,对应的水性涂料漆膜的遮盖力较高、光泽度较高,表现为正线性关系;加入的钛白粉颜料性能对水性涂料漆膜的白度和耐候性影响较小。     

一种颜料级钛白粉在水性体系中分散性的评价方法

通过大量的试验,配制出一种适合于钛白粉生产企业进行产品水分散性测试的水性涂料,提出了水分散性的测试新方法,建立起判别钛白粉分散性与遮盖力的判别要求,能够有效地指导钛白粉生产企业来提高产品的水性分散,服务于直接客户,方法简捷、快速,具有较高的实用性。     

二氧化硅消剂剂在溶剂型木器涂料中的应用

阐述了溶剂型木器涂料对SiO2消光剂的要求，影响消光性的因素，SiO2的分散性防沉，以及SiO2消光剂的选择。     

浅析钛白粉分散程度对涂层性能的影响

钛白粉被认为是目前世界上性能最好的一种白色颜料,广泛应用于涂料、塑料、造纸、印刷油墨、化妆品等工业。分散性是钛白粉的重要指标之一,当钛白粉被分散在涂料体系中,其分散程度对涂层性能的影响是至关重要的。本实验将钛白粉在涂料中分散到不同程度,将不同分散程度的浆料制成涂层,通过检测涂层的各个指标,找出钛白粉分散程度对涂层性能的影响规律。     

染料敏化太阳能电池光阳极制备及其应用

本文采用二氧化钛(P25),粘结剂及溶剂,研磨数小时得到均匀分散的纳米二氧化钛浆料,通过涂布法在FTO导电玻璃衬底上制备了光阳极,并用其组装成染料敏化太阳能电池。经过优化二氧化钛和粘结剂的比例,得到平整、致密、均匀的二氧化钛薄膜。对二氧化钛薄膜进行FTIR、SEM和光学显微镜表征,并对组装电池进行光电性能测试,研究了二氧化钛浆料不同制备条件对太阳能电池性能的影响。结果表明,二氧化钛粉末和粘结剂质量比为4∶3时,制备的二氧化钛浆料稳定性高;涂布厚度为20μm时,电池性能较好。组装的染料敏化太阳能电池在100mW/cm2模拟太阳光照下,光电转换效率达到2.51%。     

Determination of titanium dioxide in soaps by furnace atomic absorption spectrometry

A procedure for the determination of titanium dioxide in soaps by furnace atomic absorption spectrometry is described. The method has the advantage of being rapid and simple. After the soap is dispersed in water, the titanium dioxide content is determined directly without any preliminary treatment with acids and bases to solubilize the titanium dioxide.     

TiCl_4气相氧化法制备金红石型TiO_2的工艺

以粗TiC l4(98.0%)为主要原料,通过白矿物油除钒提纯处理后,采用气相氧化法制备出金红石型TiO2,并分析了粉体的相关性能。研究表明,制备的金红石型TiO2具有较高的晶型转化率(100.0%)、白度(102.08%)和消色力(123%),且粒度适宜(258 nm)、粒度分布较窄、近似球形、分散性好等优异性能。A lC l3蒸气在气相反应中起到了晶型转化剂的作用。当A lC l3加入量增加至2.6%以上时,TiO2的晶型转化率达到了最大值100.0%。     

全消光聚酯及纤维的研究开发

为生产高附加值的涤纶产品,将不同方法配制的二氧化钛乙二醇浆料加入聚酯聚合釜,合成全消光聚酯切片,再将全消光聚酯切片制备成全消光聚酯纤维。测试了全消光聚酯切片和纤维的性能,分析了纺丝过程中聚酯的黏度降,用扫描电镜观察了二氧化钛在纤维中的分布情况。试验结果表明:两种二氧化钛乙二醇浆料都可以合成全消光聚酯切片;该聚酯切片的可纺性、牵伸性及热稳定性均较好;二氧化钛在纤维中分散均匀。     

Energy transfer between fluorescent organic pigments

Energy transfer between fluorescent organic pigments (fluorophors) dispersed in a paint vehicle was studied for mixtures of a yellow, a red, and an orange fluorescent pigment, and for mixtures of these with titanium dioxide. Radiative energy transfer occurs among the fluorophors, but not between them and titanium dioxide A shift to longer wavelengths of the emission peak of a fluorophor with increasing paint-film thickness was noted and was ascribed to reabsorption and reemission of fluoresced radiation within the overlapping excitation and emission region typical of these organic fluorophors.     

Rheological studies of the cure of epoxy/polyester powder coatings containing titanium dioxide

The cure characteristics of a series of powder coatings containing titanium dioxide dispersed in an epoxy/polyester matrix are reported. The titanium dioxide pigments were produced via both the chloride and sulfate routes and coated with varying amounts of alumina and silica. Comparison data for formulations containing zinc oxide and silica are also included. The time to gelation for these powder coatings depends on a number of factors. Increasing the level of flow agent significantly reduces the time to gelation. The presence of traces of zinc inhibits cure in the case of the sulfate-based pigments. Varying levels of alumina and silica in the coating on the titanium dioxide coating also influence the time to gelation. Increasing the level of silica on the chloride-based coating increases the time to gelation, whereas in the case of the sulfate based coating the time to gelation is shortened. These differences are attributed to the effects of zinc in the coating and the effectiveness of the dicyandiamide catalysts.     

A New Oxidation Catalyst System using Fluorous Cobalt(II) Species in Water-supercritical Carbon dioxide (C–H free environment)

Stabilized water droplet dispersed in supercritical carbon dioxide fluid is demonstrated to be an excellent alternative solvent system to acetic acid for air oxidation of a number of alkyl aromatic hydrocarbons using Co(II) species at mild conditions.     

Coagulation and Flotation of Colloidal Titanium Dioxide

Abstract

The foam separation of dispersed and coagulated titanium dioxide was investigated using anionic and cationic collector surfactants in a batch flotation system. Aluminum sulfate was used as the coagulating agent, and ethanol served as the frother. Removal was studied as a function of pH with coagulant and collector concentrations as parameters.     

Photoelectrochemical response of TiO2 pigmented membranes

Titanium dioxide pigments have been dispersed in a porous nitrocellulose matrix applied to a vitreous carbon electrode. Illumination of these coated electrodes with monochromatic light in the near UV region gives rise to photocurrents which have been shown to correspond to the oxidation or reduction of hydrogen peroxide produced at the illuminated titanium dioxide particles. Ring-disc and pulsed photocurrent measurements have been used to investigate how the photochemical reaction is coupled by diffusion to the electrochemical detection of hydrogen peroxide. The results of the study suggest that the photocatalytic properties of semi-conductor dispersions may be characterized using similar coated electrodes.     

稳定的多色电泳分散液制备及低电压电子纸显示

为提高电子纸电泳分散液(电泳液)的稳定性并降低使用电压,采用毕克公司的BYK161和BYK110对二氧化钛等颜料复配,制备高稳定的红、绿、蓝、黄、黑各色电泳液,组装成电子纸器件,通过紫外分光光度计对电子纸颜料的反射特征峰进行动力学测试,研究它们的对比度与双稳性,经测定:所得电子纸具有相同的开关时间(470—510 ms),沉降时间(t_(1/3))为72 h,对比度可达7,具有良好的双稳性,适用于低电压多色电子纸显示。