通过包覆含铝物质提高氧化铁黄颜料的耐热性能

氧化铁黄的耐热性能较差,177℃便开始脱水变色,因此在塑料和高温涂料行业的应用受到限制。通过水热法和沉淀法相结合的方式,在氧化铁黄表面包覆一层含铝物质,制备耐热型包覆氧化铁黄颜料,探讨水热处理时间、温度及pH值对包覆铁黄耐热性能的影响。得到了最佳反应条件如下:pH为8、180℃水热处理6h时,铁黄的耐热温度可达240℃,色差为2.58。同时分析了不同pH值条件下包覆铁黄耐热性能差异的原因,结果表明:主要是由包覆层形成物质不同引起,其中pH为4和6时,包覆层为钠明矾石和羟基氧化铝的混合物;pH为8和10时,包覆层为羟基氧化铝;与未包覆铁黄相比,包覆铁黄的耐热性能明显提升。     

水合二氧化硅在TiO_2上的沉积及颜料性能影响

通过液相化学沉淀法采用水合二氧化硅对TiO2进行了表面包覆,对包覆过程的温度、pH值、包覆量对产品颜料性能的影响进行了系统研究,并对其机理进行了分析。结果表明,水合二氧化硅的沉积量(质量分数)随温度的升高而增加,膜层形态发生变化,且在碱性环境下明显高于酸性环境。水合二氧化硅适宜的沉积条件为pH=9.5,80℃,沉积量为2%—3%,此时沉积率可达到77%,产品的综合颜料性能较好。     

铝包膜TiO2的膜层结构对颜料性能的影响

以偏铝酸钠为包膜剂，采用液相沉淀法在TiO2粒子表面包覆Al2O3膜。采用TEM、SEM、XRF等手段表征无机膜层，通过测试包膜TiO2样品的耐候性、光泽度、亮度等评价其颜料性能。研究以HRTEM结合晶格计算分析膜层氧化铝晶型，并对包膜pH和温度对包膜TiO2的膜层结构和颜料性能的影响进行了实验研究。结果表明，酸性条件下包膜TiO2的膜层氧化铝为无定形，样品耐候性较优；pH=10时膜层氧化铝为勃姆石型和拜耳石型混合晶型，以勃姆石型为主，产品颜料性能优异；pH>11时膜层氧化铝为拜耳石型，产品颜料性能较差。温度升高会增加膜层氧化铝的结晶度，提高包膜TiO2产品的颜料性能。     

包覆型耐温氧化铁黄颜料制备技术研究进展

氧化铁黄颜料受热易脱水变色,因此其在塑料加工和烘烤型涂料等高温场合中应用受到限制。本文对国内外有关通过表面包覆方法提高氧化铁黄颜料耐温性的相关技术进行了综述,涉及的方法包括水热法、沉淀法、聚合反应包覆法等,并对各种方法的优缺点进行了比较。此外,氧化铁黄原位改性合成、固相法合成铁酸盐等耐温黄色颜料新技术将有广阔的市场前景。     

双覆层包膜法制备彩色云母珠光颜料

通过双覆层包膜法在自制云母钛表面包覆一层其它金属氧化物,而制备出彩色云母珠光颜料.钴着黑色珠光颜料的最适宜工艺条件为:水解温度100℃,pH值7～8,对应于10 g云母钛的硝酸钴加入量为25～30 mL,水解反应时间为2.0 h,煅烧条件是在600℃下保温1.5 h.镍着灰绿色珠光颜料的最适宜工艺条件为:水解温度90 ...     

提高包膜钛白颜料性能的试验研究

分析了不同包膜因素、包膜剂加入量及包膜工艺对包膜二氧化钛颜料性能的影响。结果表明,在TiO2粒子表面包覆二氧化硅的量最好为2％～3％,得到的包膜钛白粉的耐候性和消色力迭到最佳,而采用复合单包铝的工艺也可以迭到既能提高二氧化钛的耐候性,又不降低二氧化钛的消色力等颜料性能指标的目的,有利于提高二氧化钛制品的应用性能和延长其使用寿命。     

超耐候性TiO2颜料的包膜工艺

耐候性是TiO2颜料的一项重要性能,采用致密硅包膜新工艺将使TiO2颜料具有超耐候性,本文从包膜剂加入方式、包膜剂加入量、温度、pH值等方面对超耐候性包膜工艺进行研究,讨论了致密硅包膜原理,用酸溶率评价包膜效果.在并流加入方式、包膜剂加入量3.5%、温度90 ℃、pH值为9.5～10和Al2O3包覆的条件下制备出超耐候性TiO2颜料,其抗老化试验结果超过6 000 h.     

金红石型二氧化钛的无机有机包膜研究

为提高二氧化钛的颜料性能和分散性,以六偏磷酸钠为分散剂,用化学液相沉积法对金红石型二氧化钛初品进行了锆、铝氧化物无机包膜,然后再对其进行有机包膜.研究了无机包膜过程中二氧化钛的分散、浆液pH、反应时间、浆料温度对二氧化钛蓝光白度(Wr和光泽度(L)的影响,得到包覆锆、铝氧化物的优化工艺条件.经无机包膜明显改善了样品的白度和光泽度.并用透射电镜(TEM)和X射线光电子能谱(XPS)对二氧化钛样品进行了表征.最后对经过无机、有机包膜后的二氧化钛进行了各种颜料性能(遮盖力、相对消色力、细度、吸油量)检测和沉降性实验,结果表明其颜料性能和分散性得到明显改善.     

幻彩型人工氟金云母钛珠光颜料制备工艺的研究

利用液相沉积法对不同粒径的氟金云母钛珠光颜料制备工艺进行了研究。探讨了反应温度、TiCl4浓度、TiCl4加料速度对幻彩系列颜料珠光效果的影响以及TiCl4用量与颜料幻彩颜色的对应关系。采用扫描电子显微镜(SEM)观察云母钛珠光颜料的表面TiO2膜形貌。研究结果表明:在反应温度为78℃、TiCl4浓度为1.5～2.0 mol/L时得到珠光颜料光泽好,其表面包覆的TiO2膜平整、连续、致密、粒径在40 nm左右。氟金云母的平均粒径越小,TiCl4的最佳加料速度越快。制备同一色彩珠光颜料时,不同粒径的氟金云母所需包覆的TiO2量以单位比表面积计基本相同,所以在颜料色彩相同情况下,只要测得氟金云母的比表面积,即可推算出不同粒径云母所需包覆的TiO2量。     

四针状氧化锌晶须的氧化硅包覆改性（英文）

通过并流中和法对T-Zn Ow进行氧化硅包覆改性,改善了与有机高分子材料的相容性。利用红外光谱、X射线衍射、扫描电子显微镜、激光粒度分析等手段对包覆后的T-Zn Ow进行了表征,探讨了p H值、陈化时间、温度以及SiO_2包覆量对包覆效果的影响。结果表明:晶须表面成功包覆了非晶态硅氧化合物;包膜后的T-Zn Ow粒径减小,分散性能大幅度提高;实现均匀完整包覆的最佳工艺条件为:包膜p H=9~10,陈化时间5 h,反应温度90℃,SiO_2包覆量10%(质量分数)。     

Al（OH）3@Zn（OH）2双层包覆氧化铁黄合成及其耐热性能研究

采用共沉淀法对铁黄颜料进行Al（OH）₃/Zn（OH）₂双层异相包覆,提升其耐热性能,并通过XRD、TG-DTA、FT-IR、SEM&EDS等手段对包覆前后铁黄颜料的微观结构进行表征。研究结果表明,包覆质量分数为40%的Al（OH）₃时铁黄颜料的耐热性能较好;第二层包覆Zn（OH）₂,最优包覆质量分数为30%,样品在240 ℃时色差值为1.84。XRD测试结果表明,Al（OH）₃和Zn（OH）₂包覆并没有改变氧化铁黄的特征峰,两者可能以无定形态包覆在铁黄粒子表面。SEM、EDS、FT-IR测试表明,Al（OH）₃/Zn（OH）₂已成功对铁黄颜料进行了包覆;此外,还出现了片状结构对应Al（OH）₃自身成核现象,包锌后出现了团聚现象。TG-DTA表征显示,包覆后样品升温脱水分两步,低温吸热峰对应包覆层物质的脱水,高温吸热峰偏向更高温度,对应包覆颜料耐热性能的提升。     

Preparation of high near-infrared reflectance mica/(Ni,Sb)-co-doped rutile yellow composite pigment via mechanochemical pretreatment and sintering

Mica/(Ni, Sb)-co-doped rutile yellow composite pigment with a high near-infrared reflectance was prepared via mechanochemical pretreatment and subsequent sintering. (Ni, Sb)-co-doped rutile yellow pigment was synthesized by a solid-phase method in the presence of sodium fluoride (NaF) as a mineralizer, and mica was peeled by ultrafine grinding. The pigment, mica and mica/pigment composite were characterized by X-ray diffraction, laser diffraction particle size analysis, nitrogen gas adsorption method, scanning electron microscopy, energy dispersive spectroscopy, ultraviolet–visible–near-infrared spectroscopy, CIEL*a*b* color scales, and infrared irradiation image, respectively. The results show that the temperature of synthesizing a pure rutile pigment in solid-phase reaction is reduced by 100°C due to the addition of mineralizer NaF. (Ni, Sb)-co-doped rutile pigment has better color rendering performance and near-infrared (NIR) reflectance. Ultrafine grinding produces the finer flatty mica particles with fresh reflective surfaces, thus improving NIR reflectance of peeled mica. In mica/pigment composite prepared via mechanochemical pretreatment and subsequent sintering, peeled mica has a synergistic effect on (Ni, Sb)-co-doped rutile pigment particles to further scatter near-infrared radiation through the multiple layer reflections, leading to a better heat insulation. The high near-infrared reflectance of composite pigment increases to 97.72%, and the b* value of the pigment synthesized with 1 wt% NaF is 37.77. For the irradiation infrared lamp, the surface temperature of aluminum plate coated with mica/(Ni, Sb)-co-doped rutile yellow composite pigment is 40.1 ± 0.2°C, which is lower than that of aluminum plate uncoated determined by thermal camera and thermocouple. When aluminum plate coated with mica/(Ni, Sb)-co-doped rutile yellow composite pigment is under sunshine, its surface temperature is 38.6 ± 0.2°C. In addition, the mechanism of preparing the composite pigment via mechanochemical pretreatment and subsequent sintering and the multiple structure reflection effect on peeled mica surface coated with (Ni, Sb)-co-doped rutile yellow pigment particles were also discussed.     

新型环氧防腐涂料的研究

采用在环氧树脂中加入纳米复合铁钛粉防锈颜料WD—D-325、固化剂、制备了新型环氧树脂防腐涂料。由于纳米技术的特性，该防腐涂料具有较高的防腐性、优异的附着力和柔韧性。实验确定了复合铁钛粉防锈颜料在环氧防腐涂料中的添加量。作为新型的环保颜料，复合铁钛粉防锈颜料可以替代红丹、锌铬黄等颜料。     

电熔镁砂涂层制备技术及防水性能研究

电熔镁砂作为高导热、耐高温的绝缘材料,在潮湿的空气中易水化变质而失去绝缘性。采用涂层法,以电熔镁砂、硝酸铝、三聚氰胺为原材料,在通氮气、1 250 ℃条件下,对电熔镁砂颗粒进行包覆。采用扫描电子显微镜（SEM）观察电熔镁砂颗粒表面已形成涂层,通过X射线衍射仪（XRD）分析表明包覆层为镁铝尖晶石,且无氮化镁、氮化铝、氮化碳。经过孔隙比表面积分析仪分析,完全包覆的电熔镁砂颗粒比表面积与之前相比有所增大。采用真空吸水干燥法检验吸水性能,检验结果显示,经过包覆的电熔镁砂颗粒吸水率降低了92.97%,最低吸水率达到0.167 2%。实验循环7次,吸水率仍能达到0.17%以下,该项研究为电熔镁砂防水技术提供了一条新途径。     

Sustained Release of Prindopril Erbumine from Its Chitosan-Coated Magnetic Nanoparticles for Biomedical Applications

The preparation of magnetic nanoparticles coated with chitosan-prindopril erbumine was accomplished and confirmed by X-ray diffraction, TEM, magnetic measurements, thermal analysis and infrared spectroscopic studies. X-ray diffraction and TEM results demonstrated that the magnetic nanoparticles were pure iron oxide phase, having a spherical shape with a mean diameter of 6 nm, compared to 15 nm after coating with chitosan-prindopril erbumine (FCPE). Fourier transform infrared spectroscopy study shows that the coating of iron oxide nanoparticles takes place due to the presence of some bands that were emerging after the coating process, which belong to the prindopril erbumine (PE). The thermal stability of the PE in an FCPE nanocomposite was remarkably enhanced. The release study showed that around 89% of PE could be released within about 93 hours by a phosphate buffer solution at pH 7.4, which was found to be of sustained manner governed by first order kinetic. Compared to the control (untreated), cell viability study in 3T3 cells at 72 h post exposure to both the nanoparticles and the pure drug was found to be sustained above 80% using different doses.     

硫铁矿烧渣水热法制备氧化铁红颜料工艺研究

在以硫铁矿烧渣为原料、氨水为沉淀剂水热法制备氧化铁红颜料试验中,研究了总铁含量、反应温度、反应时间、pH值及n（Fe~（2＋））/n（Fe~（3＋））等因素对氧化铁红Fe_2O_3含量和颜色色相的影响。研究表明,在总铁含量2.0 mol/L、反应温度200℃、反应时间0.5 h、pH=7～8和n（Fe~（2＋））/n（Fe~（3＋））=0.11的条件下,可以获得高性能鲜红色氧化铁红颜料,并对氧化铁红产品进行XRD和SEM表征,产品质量符合国家标准要求。     

A photo-curing study of a pigmented UV-curable alkyd

The photo-curing of a pigmented UV-curable tung oil alkyd system (UVTA) was investigated. The UV-curable alkyd was a Diels–Alder Adduct of trimethylolpropane trimethacrylate with a tung oil-based alkyd. A mixture of yellow iron oxide, red iron oxide, titanium dioxide and lamp black pigments were chosen to obtain an observed yellow color. The pigment mixture, UV-curable alkyd and a reactive diluent were formulated together and photo-cured via a free radical mechanism. The through and surface cure was assessed by thumb twist, blocking resistance and MEK single rub. The through cure and surface cure assessment showed that optimum cure was achieved using UV-A as a source with two photoinitiators: phenylbis(2,4,6-trimethylbenzoyl-phosphine oxide) at 2 wt% and 1-hydroxy-cyclohexyl-phenyl-ketone at 4 wt%. The effect of reactive diluent was also investigated. Ten different reactive diluents were used. After curing, pencil hardness, conical mandrel, impact resistance, cross cut adhesion and gloss were measured. In addition, dynamic mechanical thermal analysis (DMTA) was used to evaluate selected systems. The coatings tests showed that the use of long chain linear structure diluents, such as isodecyl methacrylate, provided UV-curable paint films with better impact resistance, flexibility, and adhesion over other reactive diluents.     

Development of T-ZnOw@Al2O3-incorporated low-temperature curing aluminium phosphate coating on Ti–6Al–4V alloy

In this study, a low-temperature curing aluminium phosphate coating was developed on a Ti–6Al–4V alloy by prolonged curing. The coating was composed of a phosphate binder, a T-ZnOw@Al₂O₃ core-shell curing agent, and an Al filler. The phosphate binder was produced by the reaction between phosphoric acid and aluminium hydroxide (P/Al = 3:1.4) and was mainly composed of Al(H₂PO₄)₃. The T-ZnOw@Al₂O₃ curing agent was produced by sol-gel routes and its core-shell microstructure was verified by transmission electron microscopy. The curing mechanism of the coating in the presence of T-ZnOw@Al₂O₃ was investigated by obtaining its thermogravimetric differential thermal analysis curves and measuring its weight loss. The results showed that zinc oxide was released during curing. Complete curing was achieved at a relatively low temperature of 70 °C after prolonged curing for 120 min (P:Zn = 10:1). This rendered the phosphate coating suitable for practical applications. Though the peculiar tetrapod-like shape of T-ZnOw disappeared after being surrounded by Al₂O₃, the refining of the T-ZnOw@Al₂O₃ core-shell particles resulted in a decrease in the curing time and an increase in the hardness of the coating (higher than that of the ZnO@Al₂O₃ curing agent). The Al filler improved the surface roughness and oxidation resistance of the coating at 800 °C. A crack-free aluminium phosphate coating was achieved at the P:Zn:Al mass ratio of 10:1:0.05.     

Surface characteristics of coating layers formed by coating pigments with different particle sizes and size distribution

The effects of coating color raw material variables were tested on absorbing and non-absorbing base materials. The particle size of the coating pigments was the main variable affecting the gloss of the non-absorbing base materials. Adding binders and increasing the drying temperature has a negative effect on the gloss development of both calendered and uncalendered coating layers. On calendered layers, coating layer films showed more gloss development than for coated papers, especially with coarse particles. Uncalendered calcium carbonate-coated papers have a higher PPS roughness than calendered clay-coated papers. The effectiveness of calendering, as described by “calenderability,” showed an increase in gloss with increasing number of nips, irrespective of size, and size distribution of pigment particles.