液相沉积法制备金云母钛珠光颜料

以耐高温性能优于绢云母的金云母为基材,TiCl4为沉淀剂,SnCl4为晶型促进剂,通过液相沉积法成功制备金云母钛珠光颜料。通过X射线衍射(XRD)和扫描电子显微镜(SEM)分析对金云母钛珠光颜料的结构进行表征,重点探讨了该种液相沉积法对金云母钛珠光颜料的制备效果。结果表明TiO2纳米粒子均匀地包覆于金云母表面,且TiO2纳米粒子粒径均匀,分散性好。     

云母钛珠光颜料液相沉积剂制备工艺的研究

本文研究了不同的云母钛珠光颜料液相沉积剂的制备工艺。根据钛的含氧酸盐和无氧酸盐的理化性质、水解机理的不同,分别配制了4种不同的钛盐溶液(①Ti(SO4)2 H2SO4,②Ti(SO4)2加热分解 H2SO4,③TiCl4 HCl,④TiCl4 H2SO4)作为制备云母钛珠光颜料的液相沉积剂。实验结果表明:以第③种方案配制的钛盐溶液在云母表面进行液相包膜后,所得云母钛珠光颜料的质量较好。     

双覆层云母珠光颜料制备研究

采用液相沉积法制备云母钛珠光颜料,在制备单覆层TiO2／Mica的基础上再包裹一层Cr2O3得到双覆层云母钛,针对形成双覆层中探讨沉积过程的主要条件一煅烧温度和包覆剂滴加速度对反应形成覆层效果的影响,结果表明：当反应滴定速度为0．5mL／min,煅烧温度为800℃时达到最佳珠光效果。最后通过热重分析仪分析双覆层云母钛的稳定性良好。     

金红石型云母钛珠光颜料的合成研究

采用化学诱导法合成金红石型云母钛珠光颜料 ,以SnCl4及其复配物为金红石诱导促进剂 ,在 85 0℃、0 5h的焙烧条件下合成得到了完全金红石型的云母钛珠光颜料。由正交试验得到了金红石化学诱导促进剂最佳复合配方为 :m(云母 )∶m(SnCl4)∶m(ZnO)∶m(C助剂 ) =10 0∶3∶2∶4。此方法缩短了焙烧时间 ,并使颜料表面的TiO2 相转变温度降低了约 10 0℃ ,使制得的耐候性云母钛珠光颜料具有高的珠光光泽     

化学诱导法制备金红石型云母钛珠光颜料

用化学诱导法制备金红石型云母钛珠光颜料，通过SEM，XRD等手段研究了化学诱导剂对颜料表面膜层微观结构及金红石含量的影响。结果表明：用少量SnO2，Fe2O3等金属氧化物对云母进行预膜处理，可有效地抑制云母基片对表层TiO2晶型转化的不利影响，诱导和促进TiO2的低温相变，提高颜料的珠光光泽。以SnO2-ZnO-C助剂为复合金红石诱导促进剂，在较低的焙烧温度（850℃）和较短的焙烧时间（0.5h）内制得了完全金红石化的云母钛珠光颜料，并从结构入手对诱导机理进行了初步探讨。     

氧化钕改性云母钛光干涉颜料的制备及表征

采用均匀沉淀法,以尿素为沉淀剂,在干涉色为绿色的云母钛表面包覆稀土氧化钕,制得了Nd2O3/TiO2/Mica稀土珠光颜料。研究了氧化钕的不同加入量对珠光效果及紫外吸收性能的影响。结果表明,云母钛表面包覆5%Nd2O3的紫外吸收性能明显高于云母钛本身,起到了很好的紫外屏蔽作用,且其珠光效果也为最佳。而且具有绿-淡紫随角异色效应。     

云母钛珠光颜料的研制

对钛盐的沉析特性、云母精制、颜料制备进行了探讨。研制出云母－钛珠光颜料，即二氧化钛包覆云母，包覆层明显，珠光效果显著。     

掺杂锡云母钛珠光颜料的制备及光学性能探讨

为了获得高耐候性、耐热性、光泽度的云母钛珠光颜料,以不同锡盐和四氯化钛混合溶液作为沉积剂,采用化学液相沉积法,通过改变锡盐的类型、掺杂量等工艺参数制备出不同金红石晶型比例的云母钛珠光颜料。分别采用X射线衍射(XRD)、扫描电镜(SEM)和测色仪对获得的云母钛珠光颜料进行晶型、形貌和反射率的表征。结果表明:2价锡(Sn2+)不能促使云母钛向金红石型转化,而4价锡(Sn4+)是一种良好的金红石型云母钛珠光颜料导晶剂,其最佳掺杂量为10%(物质的量分数),最佳煅烧温度为800℃。在该条件下制备的二氧化钛产品金红石型比率达到93%,经扫描电镜观察发现,产品表面平整光滑,反射率测试结果证明其光学性能最佳。     

液相化学沉积法制备云母珠光颜料的初期研究

云母珠光颜料是以天然或合成云母粉为基础性材料,使其外层表面包覆较高折光率的无机金属型氧化物透明纳米膜而制备的,通过可见光的反射或衍射机理展现出从柔和缎面到耀眼闪烁的不同斑斓色彩的珠光光泽的颜料。     

纳米(1-x)SnO2·xSb2O3复合云母钛导电珠光颜料的制备

以尿素为沉淀剂,利用均相沉淀法制备出纳米(1-x)SnO2·xSb2O3复合云母钛导电珠光颜料,研究了不同反应基质、基质的加料方式,在基质表面包覆掺锑二氧化锡(简称ATO)的量以及ATO组成中Sn4+/Sb3+的最佳摩尔比等工艺参数与颜料导电性及珠光效应的关系;从云母钛表面结构特点入手,利用双电层概念,探讨了ATO与基质云母钛的复合机理.     

略论珠光颜料与涂料的色彩艺术

从云母钛珠光颜料所具有的多重光色效应出发，阐述以其配制的珠光涂料在轿车一类高装饰性涂装中的地位和作用，并探讨采用这种新型效应颜料创造全新色彩艺术效果的途径和方法     

锂云母珠光颜料在陶瓷釉料中的性能研究

通过白度和反射率对珠光颜料在陶瓷釉料中的着色力和珠光光泽进行了表征,探讨了PH值、水浴温度、锂云母:TiO2比例和煅烧温度对所制备的珠光颜料在制品白度和反射率的影响。XRD分析结果表明:当随着锂云母:TiO2比例增加(包覆次数的增加)时,白云母晶相和金红石相发生了较大变化,从而影响着釉面的白度和反射率。结果表明当锂云母:TiO2为100:62时,通过EDS测定并计算出TiO2的包覆率约达到22.12%。其釉面效果达到最优:白度为82%,反射率为45.7%     

High chroma pearlescent pigments designed by optical simulation

Pearlescent pigments are one of the most essential materials not only in paints, plastics, and printing inks, but also in cosmetics. Pigments with higher chroma, color purity, and brightness are in high demand all over the world. In this study we developed a high chroma pearlescent pigment for powder foundation. To produce the high chroma pearlescent pigment, we have designed the layer structure of a pearlescent pigment using computer simulation. In the simulation we have considered its layer structure, the complex refractive indices of the layers, and the thickness distribution of a mica substrate that was measured with Atomic Force Microscopy (AFM). The layer thicknesses have been optimized. The feature of this design is that iron oxide having selective light absorption has been adopted as the layer material to enhance certain wavelengths of the reflected light, which is one of the properties of high chroma. Thus, we have found that a mica substrate homogeneously coated with iron oxide which is further coated with colorless titanium dioxide has a high chroma compared to ordinary pearlescent pigments. The designed pigment has been synthesized by developing a novel manufacturing method to achieve a low roughness iron-oxide surface. We believe that this simulation is useful for designing other pearlescent pigments.     

提高银白珠光颜料质量的工艺研究

以生产钛白粉的中间产物硫酸氧钛为原料,用尿素作中和剂,制备银白珠光颜料。研究了钛液中铁的含量、终点pH值、尿素加入量、升温速率和反应时间,以及加入不同掩蔽剂对云母钛珠光颜料产品白度和亮度的影响。试验结果表明,利用冷冻除铁后的钛液,调节终点pH值为1.5,尿素与TiO2质量比为(5～7)∶1,缓慢升温反应4～5h,并加入硅酸盐等掩蔽剂后,所得银白珠光颜料与纯硫酸氧钛所制的产品白度相当,且亮度很好。     

高温气相法可控制备纳米TiO2

通过火焰反应器结构设计,实现TiCl4高温气相氧化过程可控制备纳米TiO2粒子,新型火焰设计保证了TiCl4低温进入高温反应区,预热过程隔离保护喷嘴,避免了结疤堵塞;通过实验条件控制颗粒平均粒径和粒径分布,较低的TiCl4气相浓度、较高的载气流速有利于小粒径TiO2颗粒的生成。载气流速增加,中心TiCl4火焰形态由层流向湍流发展,焰长缩短,颗粒平均粒径减小。CH4燃气流量增加,高温反应区扩大,颗粒停留时间增加,颗粒尺寸增大。二次氧气的补充,提高了氧气与TiCl4的预混,有效地减小了产品TiO2颗粒的粒径。获得的TiO2产品平均粒径在20～80 nm之间。     

Comparison of Titania Particles Between Oxidation of Titanium Tetrachloride and Thermal Decomposition of Titanium Tetraisopropoxide

Thermal decomposition of TTIP was compared with oxidation of TiCl 4 in morphology and primary particle size of produced TiO 2 particles in a tubular reactor 2.7 cm in diameter and 54 cm in length under equal rate constants. The reactor temperature was varied from 850 to 1000°C for TiCl 4 oxidation and from 492 to 579°C for TTIP decomposition. The lower and upper limits of decomposition temperature for TTIP were determined so that the rate constants become equal, at corresponding limits, between TiCl 4 oxidation and TTIP decomposition. In order to maintain constant concentration with variation of reactor temperature, the flow rate of dilution gas was adjusted to compensate for the volume change of gas with temperature. The precursor concentration at the reaction condition was in the range of 1.09 2 10 m 6 to 1.09 2 10 m 5 mol/L, and the residence time of 3.1 to 10.8 s was based on the reactor set temperature. Particles from TTIP were spherical, while those from TiCl 4 were polyhedral. A considerable fraction of the precursor admitted to the reactor was consumed on the tube wall by surface reaction to form a zone coated with TiO 2 . The loss of precursor to the wall was greater with TiCl 4 oxidation. The particle size was, however, larger by 20% with TiCl 4 oxidation. By replacing the straight reaction tube with a concentric tube, the loss could be reduced, thereby increasing the amount of TiCl 4 available for particle formation significantly; the particle size was similar, however. With the straight tube a mixture of TiCl 4 and oxygen entered the reactor and the reaction occurred over the gradual increase from 650°C to a reactor set temperature of 900°C. With the concentric tube, the reactants had been preheated separately and then brought into contact right at the set temperature. The difference in the history of temperature for reaction may have brought about a difference in nucleation rate and consequently yielded particles of similar size. By analyses of BET surface area, X-ray diffraction patterns, and thermogravimetric data, TiO 2 particles from both routes were nearly nonporous, showed anatase peaks in majority, and contained no appreciable volatiles.