共查询到19条相似文献,搜索用时 78 毫秒
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蛇纹石粉体表面改性研究 总被引:5,自引:2,他引:5
研究了Span60、硬脂酸、硼酸酯等8种表面活性剂对蛇纹石粉体的改性效果,确定Span60与硼酸酯以1:1复配型表面活性剂(B1S1)作为蛇纹石粉体的改性剂.以活化指数、浊液体积为表征指标,获得了B1S1湿法改性粉体的优化工艺条件:改性剂用量5%、改性温度70 ℃、改性时间30 min.利用SEM观察了粉体改性前后在环己烷中的分散情况.改性粉体红外光谱分析与热分析表明改性剂与粉体表面发生了化学键合与物理吸附,从而使粉体在非极性溶剂中表现出良好的分散性与悬浮稳定性. 相似文献
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无机粉体表面改性技术发展现状与趋势 总被引:2,自引:0,他引:2
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。 相似文献
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硅烷偶联剂对碳化硅粉体的表面改性 总被引:2,自引:0,他引:2
采用KH-550硅烷偶联剂对SiC粉体表面进行改性,得到了改性最佳工艺参数,分析了表面改性对SiC浆料分散稳定性的影响.结果表明:SiC微粉经硅烷偶联剂处理后没有改变原始SiC微粉的物相结构,只改变了其在水中的胶体性质;减少了微粉团聚现象.与原始SiC微粉相比,改性SiC微粉表面特性发生了明显变化,Zeta电位绝对值提... 相似文献
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介绍了粉体表面改性处理设备的原理及应用,指明了发展专用的且能完成“复合”工艺的表面改性处理设备是今后的发展方向。 相似文献
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表面活性剂对粉体的有机化改性 总被引:4,自引:0,他引:4
本文研究了用表面活性剂对无机粉体碳酸钙,钛白粉,白炭黑,凹凸棒土进行有机化改性的方法,制备了改性样品,测定了样品的比表面,接触角在液体石蜡中的粘度等物化性能,还考察了带有反应性基团的新型阳离子表面活性剂(CDMAAB)所改性样品等天然橡胶力学性能的影响,结果表明上述有机化改性是可行的。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(9):1181-1191
Plasma polymer films with encapsulated metal particles were prepared by simultaneous plasma polymerization and metal evaporation. Laser annealing (Nd-YAG, 1064 nm) causes dramatic changes in the particle size and shape without material ablation, but with changes in the surface topography. This results in changes in the optical plasma resonance absorption, as demonstrated by UV-visible-near-infrared (NIR) spectroscopy. The invariable transmission in the UV region of the plasma polymer matrix after laser annealing confirms that there is no material ablation. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) demonstrated particle size changes and modifications of the plasma polymer surface due to laser annealing. 相似文献
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The compatibility between polymer matrix and filler is a vital issue in the fabrication of composites with desirable properties. To enhance the interfacial adhesion between matrix and filler, various surface modification treatments are applied. The objective of this study was to increase the affinity of silica and poly(urethane-urea)s (PUUs), thereby improving the mechanical properties of the resulting composites. Stepwise surface modification of mesoporous silica with amine-containing dendrimers was done. Various techniques were used to confirm the surface-modified structure during the stepwise reaction. Additionally, the N2 adsorption–desorption method indicated a gradual reduction in surface area, pore diameter and pore volume of the particles, which warrants the gradual propagation of the dendrimers on the surface and also inside the pores. A type IV isotherm was obtained in this analysis. Two types of pre-synthesized PUUs were chosen for composite preparation containing the surface-modified silica with 0.5, 1, 2.5 and 5 wt% concentrations. Due to the high affinity of the dendrimers containing amine moieties on the particles with polyurethane, a proper dispersion of particles in the matrix was achieved based on scanning electron micrographs. Tensile measurements showed an increased Young's modulus and strength of polyurethane films as a result of addition of the particles. However, no significant improvement in the tensile performance of the composites was seen above 2.5 wt% particle loading due to some particle aggregations. © 2021 Society of Industrial Chemistry. 相似文献
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Preparation and properties of composite mineral powders 总被引:1,自引:0,他引:1
Mineral powders such as ground calcium carbonate (GCC) and wollastonite are widely used as fillers in plastics, rubber, paper, paints and other fields. The interface compatibility between the polymer matrix and the mineral particles is relatively weak, both because of the smooth cleavage surface and the sharp particle edges formed during pulverizing. It is beneficial therefore to modify the surface properties of mineral powders before they are used in a polymer composite. In this paper, we report the successful preparation of composite mineral particles, coated by nanoparticles of calcium carbonate of 20-100 nm particle size, by chemical reaction using the Ca(OH)2-H2O-CO2 system. The degree of nanoparticle coverage can reach 100% if the operating parameters are effectively controlled, and the specific surface area can be increased to three times the value before modification. Mechanical testing of polypropylene containing composite wollastonite powder as a filler shows an increase in the impact strength of 65% compared to similar samples prepared using conventional filler powder. 相似文献
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芳纶表面改性研究进展 总被引:17,自引:1,他引:17
简单回顾了芳纶的发展历史,阐述了表面涂层法、化学改性、物理改性等几种芳纶表面改性方法的研究现状,同时介绍了3种常用来表征纤维复合材料界面结合强度的方法,最后指出芳纶表面改性技术的发展方向。 相似文献
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