SLG型连续式粉体表面改性机应用研究

在论述粉体表面改性设备应具备的工艺特性的基础上 ,介绍了新研制开发的SLG型连续式粉体表面改性机的结构、工作原理、性能特点以及在重钙、轻钙、纳米氧化锌、纳米碳酸钙、煅烧高岭土等无机粉体表面改性中的应用。工业应用结果表明 ,SLG型连续式粉体表面改性机对粉体和表面改性剂具有良好的分散性 ,能使它们充分和机会均等地接触 ,对粉体 ,特别是对超细粉体和无机纳米粉体的表面改性或处理效果较好 ,且能耗低、无粉尘污染、操作简单、运行平稳。

SLG型连续式粉体表面改性机改性机理析疑

在SLG型连续式粉体表面改性机向市场推广过程中 ,不少专家和用户就该设备的改性原理并与传统重力型搅拌式改性设备作对比后 ,提出了一些问题 ,本文就此作出详细的解答和说明。

SLG型粉体表面改性机的温度调控规律

为系统研究改性腔的温度调控规律,在SLG-200型粉体表面改性机上搭建温度自动测控系统,实现对改性腔温度的自动监控和对"风门/料门开度"的计算机调控;建立以"风门/料门开度"为输入变量、以"改性腔温度"为输出变量的静态模型和传递函数模型,探究了空载运行条件下改性机"风门/料门开度"对温度的影响规律。实验结果表明:在空载运行条件下,"风门/料门开度"的变化对改性温度的调节作用是非线性的,风门开度的有效调节范围为20%～80%;风门比料门的开度变化对温度的调节作用更显著;风门开度由小变大时,传递函数的增益先增大后减小,特征时间常数先减小后增大。

CM型连续式粉体复合改性机的研制

首先简述了中国粉体改性设备的技术现状,阐述了CM(蜂巢磨,Cell Mill)型连续式复合改性机的结构特点、技术参数、关键技术、工艺流程、操作要点和改性效果评价等。该改性机集深度干燥、研磨解聚、复合改性和分散处理等多种功能于一体,是一种高度连续化的粉体复合改性机,具有结构紧凑、体积小、操作简便、运行平稳、劳动强度低、噪声小等特点,其发明是中国粉体连续式复合改性和分散处理技术的重要进步。

连续改性机对硝酸铵连续改性的研究

介绍了改性粉状硝铵炸药改性设备的现状与进展。通过扫描电镜研究了由连续改性机改性的硝酸铵的表面形貌 ,对硝酸铵改性过程进行了探讨。结果表明 ,连续改性机的改性效果优于轮碾机 。

硝酸铵改性机中气流运动基于Cosmos Floworks的有限元分析

介绍了利用CosmosF loW orks进行流体分析的工作模式,并介绍了利用CosmosF loW orks进行计算模拟和分析改性机内气流变化的实例。

无机粉体表面改性技术发展现状与趋势

表面改性是无机粉体的主要加工技术之一,对提高无机粉体的应用性能和应用价值有着至关重要的作用。从粉体表面改性方法、工艺、设备、表面改性剂及其配方等方面综述了无机粉体表面改性技术现状;从表面改性工艺与设备、改性剂及其配方、层状硅酸盐矿物粉体的插层以及表面无机复合改性等方面综述了非金属矿物表面改性技术的新进展;并对无机粉体表面改性技术的发展前景和发展趋势进行了展望。

超微细煤系煅烧高岭土改性工艺及其应用

国内现在的改性1250目以上超微细煤系煅烧高岭土主要来自进口,本文探讨了1250目以上超微细煤系煅烧高岭土的表面改性设备、工艺及其应用,通过使用SLG型连续式粉体表面改性机及自配改性配方对超微细煤系煅烧高岭土的表面处理,大大提高了粉体表面的改性效果,增强了高岭土产品作为填料在有机高分子体系中的应用能力。

有机蒙脱土在有机物废水中的应用

蒙脱土是一类性能优良的吸附材料,对该类材料进行有机改性,在有机废水处理方面表现出较好的吸附效果。综述了有机蒙脱土对有机物废水处理的最新研究进展,并展望了该类材料的发展和应用前景。

Characterization of adsorptive capacity and mechanisms on adsorption of copper, lead and zinc by modified orange peel

A novel adsorbent was prepared by modifying orange peel with sodium hydroxide and calcium chloride. The morphological and characteristics of the adsorbent were evaluated by infrared spectroscopy （IR）, scanning electron microscopy （SEM） and N2-adsorption techniques. The adsorption behavior of Cu^2＋, Pb^2＋ and Zn^2＋ on modified orange peel （SCOP） was studied by varying parameters like pH, initial concentration of metal ions. Equilibrium was well described by Langmuir equation with the maximum adsorption capacities for Cu^2＋, Pb^2＋ and Zn^2＋ of 70.73, 209.8 and 56.18 mg/g, respectively. Based on the results obtained in batch experiments, breakthrough profiles were examined using a column packed with SCOP for the separation of small concentration of Pb^2＋ from an excess of Zn^2＋ followed by elution tests. Ion exchange with Ca^2＋ neutralizing the carboxyl groups of the pectin was found to be the predominant mechanism.

Surface modification of calcium carbonate:A review of theories,methods and applications

Calcium carbonate,which is widely employed as a filler added into the polymer matrix,has large numbers of applications owing to the excellent properties such as low cost,non-toxicity,high natural reserves and biocompatibility.Nevertheless,in order to obtain the good filling effect,calcium carbonate needs to be surface modified by organic molecules so as to enhance the dispersion and compatibility within the composites.This review paper systematically introduces the theory,methods,and applications progress of calcium carbonate with surface modification.Additionally,the key factors that affect the properties of the composites as well as the current difficulties and challenges are highlighted.The current research progress and potential application prospects of calcium carbonate in the fields of plastics,rubber,paper,medicine and environmental protection are discussed as well.Generally,this review can provide valuable reference for the modification and comprehensive utilization of calcium carbonate.

Mechanism of coconut husk activated carbon modified by Mn(NO3)2

To study the mechanism by which activated carbon is modified by HNO3 and Mn(NO3)2,the pore texture and surface chemical characteristics of carbon materials in coconut husk activated carbon(AC)were examined via scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).After being modified by HNO3,the millipore character of AC became deformed,and the character of the adjacent pores remained consolidated.The surface manganites of Mn/AC-1 presented as block and reticular fiber structures,Mn/AC-2's surface manganites presented as petty mammock crystals,and Mn/AC-3's surface manganites were observed as gauze nanosheets that interlace to fill in the pore canal.Nitric acid modification was shown to enlarge surface pores but decrease the specific surface area of AC.Mn loading can be used to construct a new pore structure that,in turn,increased the total specific surface area as well as the specific surface area and the volume of the millipores.Mn/AC-2's pore structure was optimized at a calcination temperature of 500℃and a loading quantity of 5%.The ash content of AC was considerably reduced after modified by HNO3.The active materials for Mn/AC-1 mainly consisted of Mn3O4,with a few Mn2O3 crystals,whereas Mn/AC-2's materials were mainly Mn3O4 and some MnO crystals.Mn/AC-3 was exclusively composed of Mn3O4.HNO3 activation and Mn loading modification did not considerably affect the functional group species present on the catalyst.Modification conditions using the same loading quantities and higher calcination temperatures decreased the number of O—H and N—H bonds while conversely increasing the number of CC and C—O bonds.On the contrary,the use of a higher loading quantity while maintaining the same calcination temperature increased the number of O—H and N—H bonds.A higher loading quantity is beneficial for increasing Mn^4+species.A higher calcination temperature is beneficial for increasing Mn^3+species.The results can optimize the conditions under which Mn/AC catalyst modification occurs,thus improving the physical and chemical properties of carbon-based sorbents.

Surface Modification Mechanism of Fine Coal by Electrochemical Methods

In order to reveal the surface modification mechanism of fine coal by electrochemical methods, the structural changes of the coal surface before and after electrochemical modification were investigated by Fourier Transform In- frared Spectra (FTIR) and Raman Spectra. The results show that under certain electrochemical conditions, the oxy- gen-containing functional group in the coal structure and the oxygen content of absorption could be reduced and the floatability of coal improved. At the same time, the sulfur in the coal was reduced to the hydrophilic S2– which could be separated easily from coal. Thus electrochemical modification methods could be used to change the structure and func- tional group on the coal surface and to enhance the floatability of coal.

Layered Double Hydroxide Modified by PEGylated Hyaluronic Acid as a Hybrid Nanocarrier for Targeted Drug Delivery

In recent years, organic-inorganic hybrid nanocarriers are explored for effective drug delivery and preferable disease treatments. In this study, using 5-fluorouracil(5-FU)as electronegative model drug, a new type of organic-inorganic hybrid drug delivery system(LDH/HA-PEG/5-FU)was conceived and manufactured by the adsorption of PEGylated hyaluronic acid(HA-PEG)on the surface of layered double hydroxide(LDH, prepared via hydrothermal method)and the intercalation of 5-FU in the interlamination of LDH via ion exchange strategy. The drug loading amount of LDH/HA-PEG/5-FU achieved as high as 34.2%. LDH, LDH/5-FU and LDH/HA-PEG/5-FU were characterized by FT-IR, XRD, TGA, laser particle size analyzer and SEM. With the benefit of p Hdegradable feature of LDH and enzyme-degradable feature of HA, LDH/HA-PEG/5-FU showed p H-degradable and enzyme-degradable capacity in in vitro drug release. Moreover, the drug carrier LDH/HA-PEG contained biocompatible PEG and tumor-targeted HA, resulting in lower cytotoxicity and better endocytosis compared with LDH in vitro. It was suggested that the organic-inorganic hybrid drug delivery system, which was endowed with the properties of controlled release, low toxicity and tumor-targeting delivery for ameliorative cancer therapy, was advisable and might be applied further to fulfill other treatments.

The Mechanism of Asphalt Modification by Crumb Rubber

To investigate the mechanism of asphalt modification by crumb rubber,the interactions between FCC slurry and rubber particles were evaluated at different temperatures and time.The rules of the change in mass of SARA composition in FCC slurry were obtained before and after its interaction with rubber particles,which showed that crumb rubber not only absorbed saturates and aromatics but also resins.Asphaltenes promoted the desulfurization or degradation of crumb rubber during the interaction between asphalt and crumb rubber.

Laboratory investigation on effects of organic montmorillonite on performance of crumb rubber modified asphalt

In this paper,organic montmorillonite(OMMT)was added into crumb rubber modified asphalt(CRMA)to improve its high temperature performance,anti-aging performance and storage stability.The effects of different OMMT content on properties of CRMA were studied.The rutting factor obtained by dynamic shear rheological(DSR)test was adopted to evaluate the high-temperature performance.The creep stiffness and m value determined by the bending beam rheometer(BBR)test were employed to evaluate the low-temperature performance.The softening point,ductility,rutting factor before and after rolling thin film ovens test(RTFOT)and pressure aging vessel test(PAV)were compared to characterize the aging properties.Moreover,the segregation test after being reserved for 48 h and 7 d was conducted,and the softening point and rutting factor of upper and lower layers of segregation pipe were adopted to evaluate the storage stability.The results indicated that the high-temperature performance and anti-aging performance were developed with the increasing content of OMMT,while the low-temperature performance deteriorated.The storage stability was improved with the increasing content of OMMT before the content exceeded 4%,after which the storage stability declined.Taking account of all factors,it is suggested that the optimum content of OMMT is 3%−4%.

Study and Characterization of Organically Modified Silica-Zirconia Anti-Graffiti Coatings Obtained by Sol-Gel

In this work, it is presented the synthesis and characterization of transparent and colorless organic-inorganic hybrid anti-graffiti protective materials obtained by sol-gel method. This type of materials is based on MTES （methyltriethoxysilane）, TPOZ （tetrapropoxide of zirconium） and PDMS （polydimethylsiloxane）. The synthesis has been carried out at 25, 35 and 45 ℃ in order to evaluate the role of temperature in the structure, microstructure and anti-graffiti behavior as well. The incorporation of zirconium within the organic modified silica network, of sols after being gelled and dried, is evident by a shoulder which increased with temperature situated at 950 cml （Si-O-Zr bonds）, and it is homogenously dispersed inside the matrix avoiding the formation of large ZrO2 precipitates. As the temperature increases, the hydrolysis and condensation reactions occur in more extension and thus, the obtained sols are more cross-linked and present more Si-O-Zr linkages. The promising anti-graffiti beha＇4ior of the protectNe hybrids was qualitatively determined being the spot removal higher than 90%.

Experimental Study on the Surface Modification of Ultra Thin DLC Films

Surface modification of Diamond-like carbon (DLC) films was carried out in order to estimate the reliability of the ultra thin DLC films. The wear resistance, conductivity and mechatronic reliability of the films were studied by contact atomic force microscope (AFM), electric force microscope (EFM) and conductive AFM. The failure mechanism of pits formed and the reason for conductivity changed of DLC films were examined.

Preparation and properties of organic-inorganic modified SiO_2 thin films

Polydimethylsiloxane （PDMS）, tetraethoxysilane （TEOS）, ethyl alcohol （EtOH） and deionized water were main raw materials to prepare silicone-modified hybrid thin films using sol-gel method. The effect of the contents of H2O and PDMS on thin films was studied. When the volume ratio of H20 to TEOS is 0.5, the optimum quality of thin films is obtained. And the gelation time is affected slightly by H20 content. Uniform thin films are obtained when the volume ratio of PDMS to TEOS is 0.2. Yet, the sol would be inactive in 6 d. Various properties of thin films were studied, including hardness, adhesive quality, hydrophobic property, corrosion protection property, and abrasion resistance. Test results show that the pencil hardness is generally 3-6 H, and adhesive quality achieves the highest standard of 0. When the sintering temperature is below 400℃, the contact angle is about 95° and hydrophobic films are obtained. The abrasion resistance of thin films is better than that of aluminum alloy when the sintering temperature is higher than 300℃. And the excellent corrosion protective effect is obtained by single-layer coating when the sintering temperature is higher than 400℃.