有机硅耐磨透明涂料

详细总结了构成有机硅耐磨涂料的主要原料，无机溶胶添加剂、溶剂及其他助剂，对兼有防雾性、可染色性、抗静电性、紫外吸收性的耐磨涂料进行了介绍，给出了ＪＤ涂覆液的制备及涂层的性能。     

亲水性有机硅杂化防雾涂料的制备及性能

采用Sol-Gel技术制备了二乙醇胺/有机硅杂化涂料, 并用FTIR、UV-Vis、AFM、TGA及接触角等测试技术对涂料及其涂层进行了分析表征. 结果表明, 该杂化涂料具有良好的成膜性. 由于膜层中存在大量的亲水性羟基基团, 使膜层具有良好的亲水性能和防雾效果. 固化后的聚合物膜层中无机相形成了三维交联网络, 赋予了膜层优异的耐磨性和热稳定性.     

壳聚糖基层状硅酸盐纳米复合材料

壳聚糖基层状硅酸盐纳米复合材料是采用简单的溶液插层法,将壳聚糖及其衍生物插层进入层状硅酸盐的纳米层间而获得的有机无机纳米杂化材料。该材料偶合了壳聚糖及其衍生物和层状硅酸盐的协同优势,为壳聚糖的研发应用开辟了新方向和新途径。本文在对壳聚糖和层状硅酸盐的特性及应用进行简单介绍的基础上,重点综述了壳聚糖基层状硅酸盐纳米复合材料的制备方法、插层机理及应用现状,并提出了目前存在的主要问题。     

水性防污涂料的研究进展

海洋污损生物是海洋资源开发首先要面对的问题。防污涂料是防除海洋污损生物的关键材料。传统的防污涂料虽然发展成熟,但以油性溶剂为介质,存在挥发性有机物(VOC)排放过高、环境污染严重的问题。不释放VOC的水性涂料符合绿色无污染的环保要求,是防污材料领域研究的热点。本文对最重要的四种水性防污涂料(污损释放型水性低表面能防污涂料、自抛光型水性防污涂料、污损阻抗型水凝胶海洋防污涂料、强碱释放型水性硅酸盐防污涂料)从防污机理、制备方法和存在的问题等几个方面进行了综述,并对水性防污涂料的发展趋势进行了展望。     

黄色含硫硅酸盐类无毒新颜料的制备

研究新型无毒无机颜料,逐步取代如铅铬黄、镉黄等无机颜料,日益引人注意。我们以价廉易得的自云石凹凸棒、蒙脱石、凹凸棒石粘土矿为原料,制得黄色硅酸盐类无毒新型颜料。研究了该类颜料的骨架结构与成分,及其发色机理。工艺过程如下:     

智能涂料制备方法探索与应用

智能涂料是近几年在新型特种功能涂料基础上发展起来的.本文主要对其制备方法、类别及应用进行了详细论述.智能涂料的制备可以从聚合物膜、颜料及制作工艺等方面入手,其中创造具有"开关"性质且依赖于外部环境的刺激/响应聚合物膜的设计最为重要,它关系到膜的形成和膜表面性质,是涂料智能化的关键所在.在合成方法上,活性/可控自由基聚合技术、表面接枝技术和层层自组装工艺等已经应用于智能聚合物膜的制备;另外,纳米技术应用于涂料,也是智能涂料另一制备方法,因其某些超强性能而被视为智能涂料的初级阶段.目前,整个智能涂料的发展还基本处于以纳米技术为基础的初级阶段,其中进展较大的品种有:自清洁、抗菌、防腐、隐身、发光、磁性等对光、电、磁、温、湿、压敏感的涂料,而以智能聚合物膜为基础的高层次智能涂料还基本处于研究开发阶段.     

可聚合纳米无机氧化物杂化材料的制备及其在紫外光固化涂料中的应用

可聚合纳米无机氧化物杂化材料在紫外光固化涂料中具有较好的分散性能.与涂料中的单体和预聚物进行光聚合形成有机/无机杂化网络结构的聚合物,从而提高涂料固化膜的热稳定性能、硬度和耐磨性能等,在紫外光固化涂料的制备方面有着广阔的应用前景.目前,该类杂化材料主要采用硅烷偶联剂改性、化学接枝改性和溶胶一凝胶方法制备.本文就可聚合纳...     

化学改性环氧树脂水基涂料的研究——涂膜性能

用对氨基苯甲酸改性环氧树脂 ,使其具有亲水亲油两亲性质 ,测定了改性产物和纯环氧树脂共混物的玻璃化转变温度 ,结果显示两者能够相容 ,并以改性产物及其与纯环氧树脂的混合物制备水基涂料 ,测定了涂膜的物理和化学性能。结果表明 ,涂膜性能优良 ,保持了溶剂型环氧涂料的抗冲击强度、光泽度和硬度等方面的优点 ,而附着力提高 ,同时柔韧性大为改善 ,涂膜耐水性和耐化学药品性能优良。     

剥离型硅橡胶/黏土纳米复合材料研究

利用层状硅酸盐制备有机 无机纳米复合材料是当前人们研究的热点[1,2 ] ,这类材料具有较常规聚合物 无机填料复合材料无法比拟的优点 ,可以明显改善高分子材料的物理机械性能、热稳定性、气体阻隔性、阻燃性、导电性、光学性等 .一般来说 ,聚合物 层状硅酸盐 (Ｐｏｌｙｍｅｒｌａｙｅｒｅｄｓｉｌｉｃａｔｅ ,ＰＬＳ)纳米复合材料可分为插层型和剥离型两种类型 .插层型纳米复合材料即聚合物插入到硅酸盐层中 ,硅酸盐在近程仍保持原有的有序晶体结构 ,在远程则是无序的 .对弹性体而言 ,硅酸盐含量在插层型杂化材料中的含量比较高 ,力学性能…     

聚丙烯/层状硅酸盐纳米复合材料的制备、结构和性能

聚丙烯／层状硅酸盐纳米复合材料可通过丙烯单体插层聚合、聚丙烯溶液插层和聚丙烯熔融插层等方法制备，得到插层型或剥离型纳米复合材料，形成了与传统填充型聚合物复合材料不同的微观结构，其机械性能，热性能，阻隔性能和流变性能等明显提高，由于聚丙烯的非极性及层状硅酸盐纳米复合材料制备方法的特殊性，该研究具有一定的理论价值。     

Effect of formulation of silica‐based solution on corrosion resistance of silicate coating on hot‐dip galvanized steel

Several silica‐based solutions with 50 g/l of SiO₂ were prepared from sodium silicate solutions and silica sol; the silicate conversion coatings were obtained by immersing hot‐dip galvanized steel sheets in these solutions. These solutions were characterized using high‐resolution transmission electron microscopy and ²⁹Si nuclear magnetic resonance; the morphology of the coatings was observed by SEM and atomic force microscopy while the corrosion resistance was evaluated by electrochemical measurements as well as neutral salt spray tests. The results show that the coatings obtained from the single silica sol solution had poor adhesion and the coating obtained from the sodium silicate solution with low SiO₂/Na₂O molar ratio was uneven. By adding the silica sol to the silicate solution with low molar ratio, uniform coatings with better protection property were obtained. According to the results of ²⁹Si nuclear magnetic resonance spectra, the effects of the distribution of silicate anions with various polymerization degrees in the silica‐based solutions on the microstructure and corrosion resistance of the silicate coatings are discussed. Copyright © 2016 John Wiley & Sons, Ltd.     

Hardness Equation for Ormosils

Hardness of ormosils coating on various kinds of substrates is important, and by considering recent progresses in understanding the hardness of ionic crystals or covalent crystals, new hardness equations for calculating the hardness of glasses or ormosils from chemical compositions were derived. When we applied an indenter to the surface of glass or sol-gel coatings, the surface of indenter is a declined one to the flat surface of glass or coating, thus the applied force should be analyzed by using the shear modulus, S, and Young's modulus, E. This is now well accepted for the analysis of hardness of ionic or covalent bonding inorganic materials. For example, by considering the binding energy and plastic deformation, Gilman showed that Hv of NaCl crystal can be calculated by an equation including elastic stiffness which indicated a good agreement between calculated and observed value. For covalent crystals he reported that the strength of chemical bonds could be correlated with the glide (shear) activation energy for covalent crystals quantitatively. These explanations are basically applied to the hardness of silicate glasses and ormosils. By considering both shear modulus and Young's modulus we have derived equations for calculating the hardness of glasses or ormosils from chemical composition, which includes packing density of atoms and bond energy per unit volume has been taken account. The agreements between calculated and observed hardness values for ormosils were comparatively good.     

In vitro response of hFOB cells to pamidronate modified sodium silicate coated cellulose scaffolds

The aim of the present study was to evaluate the suitability of cellulose-based scaffolds coated with pure sodium silicate gel and sodium silicate gels accumulated with different concentrations of the bisphosphonate pamidronate as scaffolds for attachment, proliferation and differentiation of human fetal osteoblasts (hFOB 1.19). Human osteoblasts were cultured in vitro for a period up to 14 days on different cellulose scaffolds. Unmodified and sodium silicate coated cellulose scaffolds were used as control. Two surface-coated modifications of cellulose were applied. The scaffolds were coated in a modified two-step dip coating process with pure sodium silicate gel and pamidronate enriched sodium silicate gel, respectively. In order to investigate the influence of the pamidronate, concentrations of 0.667 mg Na-pamidronate/ml sodium silicate solution, 0.333 mg Na-pamidronate/ml sodium silicate solution and 3.33 x 10(-3) mg Na-pamidronate/ml sodium silicate solution were used for the coating process. Cell proliferation, vitality and attachment were examined by means of cell counting, WST-1 test, fluorescence and scanning electron microscopy. The relative grade of differentiation of hFOB cells was examined by using quantitative real-time polymerase chain reaction (qRT-PCR) analysis for the gene expression of alkaline phosphatase and osteocalcin. Proliferation and differentiation of human osteoblasts was enhanced by the sodium silicate coatings accumulated with pamidronate compared to pure sodium silicate coatings. There was a reciprocal correlation of vitality with the concentration of pamidronate. The highest vitality was found on surfaces with the lowest pamidronate accumulation. Alkaline phosphatase, an early differentiation marker, was overexpressed after 7 days in cells on all pamidronate-containing surfaces (up to 350% compared to untreated cellulose). Osteocalcin, a late differentiation marker, was overexpressed after 14 days in cells on all coated surfaces (up to 300,000% compared to untreated cellulose). The results indicate that due to the modified coating procedure a homogeneous coating and thus, an enhancement of cell attachment and subsequent cellular functions can be achieved. Low concentrations of pamidronate seem to have a relevant effect on cell proliferation and vitality and, therefore, can be recommended for the improvement of the properties of a biomaterial.     

Ni-P-无机类富勒烯WS_2纳米材料化学复合镀层的制备及其摩擦学性能初步研究

用化学复合镀技术制备了含有无机类富勒烯硫化钨纳米材料的Ni-P-(IF-WS_2) 复合镀层。用环-块摩擦实验测试了Ni-P-(IF-SW_2)的摩擦学性能。研究结果表明 它比与Ni-P，Ni-P-(层状2H-WS_2)和Ni-P-石墨复合镀层具有更高的耐磨性能和更 低的摩擦系数。分析了无机类富勒烯纳米材料改善镀层摩擦学性能的机理。     

Optical Viscometry of Spinning Sol Coatings

Optical interferometric monitoring of spin coating (optospinography) has allowed close observation of the temporal evolution of a thin silicate sol film (typically at 2000 rpm, 100 Hz data acquisition). The kinematic viscosity data obtained, using a simple analytical model, are validated with those from a mineral oil standard, with agreement well within the experimental uncertainties. For spin coating in open air, the influence of variations in refractive index, rheological properties and air flow are discussed. Inflections in the temporal evolution of the optical thickness of silicate sol films are analyzed, which indicate the usefulness of optospinography, particularly when applied in the proximity of the rotation axis and evaporation is minimized, to monitor time variations in the kinematic viscosity of these sols during spin coating.     

硅酸铜色谱分离中性氨基酸研究

本文合成了一种新型无机离子交换剂—硅酸铜,对其进行了中性氨基酸(Gly,Ala)的色谱分离研究,并与硅酸锌的分离性能进行了比较,显现出较好的特性。     

An inorganic route to decorate graphene oxide with nanosilica and investigate its effect on anti‐corrosion property of waterborne epoxy

This paper reported an inorganic route that uses potassium silicate, which is one type of alkali silicate as an inorganic modifier, taking advantage of its instability and water condensation to decorate graphene oxide (GO) with nano‐SiO₂. The ingredients of prepared nanocomposites were characterized by Fourier‐transform infrared spectroscopy (FT‐IR) and X‐ray photoelectron spectroscopy (XPS), and the thermodynamic property was tested by thermal gravimetric analysis (TGA). Scanning electron microscopy (SEM) was used to observe the morphology of SiO₂‐GO nanocomposites. All the analyses above revealed the nano‐SiO₂ (<100 nm) was deposited on the surface of GO by chemical bonds. In the meantime, the dispersion test illustrated that nano‐SiO₂ played an important role in improving the dispersity of GO. The effect of SiO₂‐GO nanocomposites on barrier and corrosion protection performance of SiO₂‐GO nanocomposites was tested by immersion experiment and electrochemical impedance spectroscopy (EIS). The results indicated that GO was helped to block the corrosion of aggressive medium; moreover, SiO₂‐GO nanocomposites had the best anticorrosion performance and the slowest rate of corrosion because of its good dispersity with waterborne epoxy coatings.     

Thermal and neutron shielding properties of 10B containing UV cured hybrid coatings

¹⁰B containing organic–inorganic hybrid coating material based on a UV-curable formulation was prepared via anhydrous sol–gel technique. UV curable coatings were applied on Plexiglas (PMMA) substrates. The molecular structure of the coating material was analyzed by ATR-FTIR spectroscopy technique. The characterization of the UV-curable coating was evaluated by various techniques such as gel content, abrasion resistance, chemical resistance, pencil hardness, pendulum hardness, MEK rubbing test, contact angle, cross-cut test, gloss, transmittance test, neutron absorption, Limiting Oxygen Index and stress–strain tests. Hybrid coatings showed a significant enhancement in radiation shielding properties. The thermal behavior of coatings was also evaluated. It is observed that the thermal stability of coatings mainly depends on their boron and silicate contents. Results of all analysis conducted on hybrid films, and coatings were discussed.     

干凝胶无机整体柱的制备及评价

以硅酸钾为硅源,甲酰胺为催化剂在毛细管内原位聚合形成干凝胶柱,制备了一系列致密度不同的整体柱。该法在柱制备及高温干燥过程中不会发生柱床断裂和塌陷现象,此特点明显优于以烷氧基硅烷为前驱体制备无机整体柱的方法。考察了不同模数硅酸钾对整体柱柱床结构的影响,用扫描电镜(SEM)和氮吸附法对整体柱结构进行了表征,考察了整体柱柱压与流速的关系;对整体柱进行十八烷基修饰后,测定了反相整体柱(C18整体柱)对蒽的柱效,通过考察甲苯在该柱上的突破曲线,获得了其对甲苯的柱容量。结果显示该整体柱柱床刚性好,在高温、高柱压、高流速时柱床能保持其物理结构的稳定性,对蒽的柱效达到41400理论塔板/m,对甲苯的柱容量为61 ng。     

Macroporous Silicate Films by Dip-Coating

Macroporous silicate thick films were prepared by the sol-gel dip-coating method accompanied by the phase separation using the composition of methyl-trimethoxysilane (MTMS), nitric acid and dimethylformamide (DMF). The morphology of the film varied to a large extent depending on the time difference between hydrolysis and dipping of the coating solution. The films prepared by early coating had inhomogeneous submicrometer-sized pores on the surface of the film. At increased reaction times, relatively narrow sized internal macropores were observed and their size gradually decreased with the increase of reaction time.