电解多功能天车打壳机构非正常失效的分析及解决方案

主要分析了电解多功能天车打壳机构中打击头、夹套、拉杆非正常失效的原因,并提出了解决的方案.     

Investigations of surface characterization of silicone rubber due to tracking phenomena under a.c. and d.c. voltages

In the present work, tracking phenomena has been studied with silicone rubber material under the a.c. and d.c. voltages following IEC-587 standards. The surface condition of the tracked zone was analysed using wide angle X-ray diffraction (WAXD) and thermogravimetric differential thermal analysis (TG-DTA) studies. The tracking time was different for a.c. and d.c. voltages.     

模具表面的激光热处理研究

对各种材料的模具表面激光热处理工艺进行了比较 ,在不同工艺条件下得到了不同的效果 ,并得到了较佳的工艺参数 ,在模具表面激光热处理方面收到了良好的效果     

Thermoplastic elastomeric composition based on maleic anhydride–grafted ground rubber tire

Ground rubber tire (GRT) powder was maleated in an internal mixer using maleic anhydride and dicumyl peroxide at 160°C. Maleated GRT was characterized by using X‐ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, wettability, and differential scanning calorimetry. The physical properties of the dynamically vulcanized 60 : 40, rubber : plastic composition based on acrylated high‐density polyethylene as the plastic phase and ethylene propylene diene rubber containing maleated GRT as the rubber phase were found to be greater than the corresponding composition containing nonmaleated GRT. The blend was found to be reprocessable, like themoplastic elastomers. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 370–378, 2002; DOI 10.1002/app.10348     

丁腈橡胶/导电粒子复合材料的正温度系数(PTC)特性

将导电粒子碳黑和铜粉分别与丁腈橡胶混合制备导电聚合物复合材料，其中碳黑（Ｎ５５０）／丁腈橡胶复合材料的电阻率随温度的变化呈现较强的正温度系数（ＰＴＣ）效应。讨论了掺入导电粒子浓度、结构和表面性质以及混炼硫化工艺等对该类材料的室温电阻率及ＰＴＣ效应的影响。     

Microstructure-related fracture toughness and fatigue crack growth behaviour in toughened, anhydride-cured epoxy resins

Fracture toughness and fatigue crack propagation (FCP) of plain and modified anhydride-cured epoxy resin (EP) were studied at ambient temperature. Liquid carboxyl-terminated acrylonitrile-butadiene (CTBN) and silicon (SI) rubber dispersions were used as tougheners for the EP. The morphology of the modified EP was characterized by dynamic mechanical analysis (DMA) and by scanning electron microscopy (SEM). The fracture toughness, K_c, of the compositions decreased with increasing deformation rate. K_c of the EP was slightly improved by CTBN addition and practically unaffected by incorporation of the SI dispersion when tests were performed at low cross-head speed, v. Both modifiers improved K_c at high v, and also the resistance to FCP, by shifting the curves to higher stress intensity factor ranges, ΔK, by comparison with the plain EP. It was established that both fracture and fatigue performance rely on the compliance, J_R, at the rubbery plateau, and thus on the apparent molecular mass between crosslinks, M_c. The failure mechanisms were less dependent upon the loading mode (fracture, fatigue), but differed basically for the various modifiers. Rubber-induced cavitation and shear yielding of the EP were dominant for CTBN, whereas crack bifurcation and branching controlled the cracking in SI-modified EP. The simultaneous use of both modifiers resulted in a synergistic effect for both the fracture toughness at high deformation rate and the FCP behavior.     

顺丁橡胶生产过程"门尼升值"的原因研究

研究了顺丁橡胶生产过程中门尼升值的原因。结果表明，顺丁橡胶生产后处理的膨胀干燥过程存在门尼升值现象。不同内在质量的顺丁橡胶门尼升值不同，正常条件下门尼升值发生于门尼粘度的测试过程。     

Y型密封圈橡胶模设计

介绍了Y型橡胶模具的设计 ,重点对模具结构和模腔尺寸进行了分析和阐述 ,经生产验证 ,此模具结构合理 ,定位可靠 ,操作方便 ,从而为同类产品的设计提供了参考。     

中国橡胶工业崛起之思考

中国已经成为橡胶工业大国,不少产品名列世界前茅,橡胶工业已是占全国GDP 1%的制造业。从2000—2004年橡胶消耗量、汽车轮胎生产量、非轮胎制品用胶量等方面的统计数据中可以看出我国橡胶工业已经崛起,分析了崛起的原因,对存在的问题进行了思考,提出了解决的方法。