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1.
钼改性酚醛树脂黏结剂的研究   总被引:8,自引:0,他引:8  
在反应釜中按一定比例加入苯酚、甲醛、钼改性荆,酸性条件下,加热搅拌2~4h,0.08MPa下真空脱水,得到黏度适中的钼改性酚醛树脂。对钼酚醛树脂进行TG和DSC分析,结果表明:改性树脂固化温度为160℃左右,热分解温度为534.8℃。红外光谱分析表明:钼元素确实已经接枝到酚醛树脂的分子链中。  相似文献
2.
子午线轮胎带束层中应力的有限元分析   总被引:8,自引:4,他引:4  
闫相桥  王友善 《轮胎工业》2000,20(8):463-467
利用自己开发的轮胎结构有限元分析软件软件详细地分析了全钢子午线轮胎带束层中的应力在调向和带束层宽度方向上的变化规律。结果表明,轮民地面的接触对带束层中应力的仅限于轮胎与地面的接触区域。在轮胎与地面接触的最低截面上,带束层端部的应力与胎冠中心处带束层应力的比例随着轮胎下降量的增大而增大。  相似文献
3.
高取代度羧甲基淀粉的制备   总被引:5,自引:0,他引:5  
用玉米淀粉、氯乙酸和氢氧化钠为原料,在乙醇溶剂中反应制备了取代度为0.6的羧甲基淀粉。采用正交设计试验考察了物料配比、反应温度、反应时间对产物取代度的影响,确定了最佳反应条件。  相似文献
4.
13%吡虫啉微胶囊剂防治蚜虫药效试验   总被引:2,自引:1,他引:1  
田间试验结果表明,13%吡虫啉微胶囊剂对菜蚜、棉蚜的防效突出。施用1-1.2g a.i./667m^2防效达90%以上,持效期30天以上,相同用药量吡虫啉微胶囊剂防效及持效明显优于可湿性粉剂。  相似文献
5.
石刻保护有机硅-丙烯酸酯乳液涂料的研究   总被引:1,自引:0,他引:1  
通过种子乳液聚合制备了有机硅-丙烯酸酯乳液涂料,用于石刻文物的防风化。采用正交设计试验探讨了单体配比、乳化剂用量、引发剂对乳液性能的影响,确定了最佳反应条件。并用FT-IR、TEM、DSC对产物结构进行了表征。  相似文献
6.
聂王焰  胡敬年 《农药》1997,36(10):48-50
本文考察了可降解可除草地膜在田间裸露降解情况和应用于黄瓜栽培中的降解情况及抑制效果。试验表明我们研制的可降解可除草地膜降解情况良好,抑草效果显著,这对减缓“白鬼污染”,保护农业生态环境促进农业的增产增收极具意义。  相似文献
7.
周艺峰  聂王焰 《农药》1995,34(9):8-10
采用氨水替代氢氧化钠,双氧水替代氯气和空气或亚硝酸钠米制备福美双--二硫化四甲基秋兰姆。研究出最佳反应条件。产品收率高、质量好,副产肥料硫酸铵,对环境不产生污染,并成功地实现了工业化生产。  相似文献
8.
As a part of long-term project aimed at super polyolefin blends, in this work, we report the mechanical reinforcement and phase morphology of the immiscible blends of polypropylene (PP) and polystyrene (PS) achieved by dynamic packing injection molding (DPIM). The shear stress (achieved by DPIM) and interfacial interaction (obtained by using styrene-butadiene-styrene (SBS) as a compatibilizer) have a great effect on phase morphology thus mechanical properties. The shear-induced morphology with core in the center and oriented zone surrounding the core was observed in the cross-section areas of the samples. The phase inversion was also found to shift towards lower PS content under shear stress, at 70 wt% in the core and 30 wt% in the oriented zone, compared with 80 wt% for static samples (without shear). The tensile strength, tensile modules and impact strength were found largely increase by means of either shear stress or compatibilizer. The PS particle size is greatly reduced with adding of SBS, and the reduced particle size results in greater resistance to deformation, which causes the co-continuous structure at oriented zone change into droplet morphology. The morphology resulting from blending and processing was discussed based on effect of interfacial tension, shear rate, phase viscosity ratio and composition. The observed change of mechanical properties was explained based on the combined effect of phase morphology (droplet-matrix or co-continuous phase) and molecular orientation under shear stress.  相似文献
9.
介绍以醋酸乙烯酯和丙烯酸酯为主要原料,研制出的性能好,卷烟车速达6000支/min的高速卷烟胶。并探讨了各种因素对产品性能的影响。  相似文献
10.
Electro catalyst Pt–Co/multi-walled C nanotubes were synthesized by using the modified polyol method with glycol as reducer. The magnetic-field-assisted fabrication of membrane electrode assemblies (MEAs) for proton exchange membrane fuel cells (PEMFCs) was proposed, to orient catalyst layers and increase the efficiency of catalyst utilization. PEMFCs with the magnetic-field-treated MEA (M-MEA) exhibited significant performance improvement over common MEA (C-MEA) without magnetic-field treatment. Under the same operating conditions, the maximum power density of MEA increased from 149.6 to 223.8 mW cm?2 when C-MEA was replaced by M-MEA. Scanning electron microscope images showed that catalysts exhibited a “cluster-like structure” in M-MEA opposed to a chaotic arrangement in C-MEA. Electrochemical impedance spectroscopy measurements revealed that M-MEA reaction resistance was lower than that of C-MEA. Cyclic voltammetry data showed an increment of almost 29.6 % in electrochemical surface area as a result of the magnetic-field treatment.  相似文献
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