共查询到20条相似文献,搜索用时 140 毫秒
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本文基于CAD/CAE技术对汽车内饰件转向护板注塑模具进行了设计。运用Pro/E软件对模具进行了三维设计,使用Moldflow对模具进行了CAE分析,优化了浇口位置,合理设计了排气槽,提高了设计效率,创新了塑料模具设计方式。根据产品结构,采用动模中心凸起布局,应用斜顶机构实现侧抽芯,简化了模具结构,提高了模具设计质量,降低了制造成本。 相似文献
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焙烧炉燃烧系统油改天然气研究与应用 总被引:1,自引:0,他引:1
介绍了炭素焙烧炉燃烧系统由燃油改为天然气的过程,以及使用效果和效益分析,真正实现了清洁生产,达到了理想的节能效果,改善了工艺水平、降低了生产成本、提高了生产效率、净化了工作环境。 相似文献
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介绍了炭素焙烧炉燃烧系统由燃油改为天然气的过程以及使用效果和效益分析,通过改造真正实现了清洁生产,达到了节能效果,改善了工艺水平,降低了生产成本,提高了生产效率,净化了工作环境。 相似文献
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阐述了一种煤制甲醇加碱工艺的技术改进,解决了国内现有工艺技术弊端,降低了设备投资,缩小了占地面积,减少了操作人员劳动强度,减轻了环境污染,并通过了三年多的生产运行验证。 相似文献
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本文介绍了用磷酸代替盐酸进行活性炭酸洗的方法,该法避免了环境污染,简化了工艺过程,改善了劳动环境,降低了产品成本,提高了产品质量。 相似文献
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以D-山梨醇为引发剂,二甲亚砜为溶剂,氢氧化钾为催化剂,环氧乙烷为单体,阴离子开环聚合合成了多官能度聚乙二醇。详细考察了催化剂、引发剂、溶剂、聚合温度等因素对聚合产物的性能影响。初步确定了聚合条件,聚合温度100~110℃,聚合时间6h。通过官能度的理论计算和测试证明合成的聚合物为多官能度聚乙二醇。 相似文献
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Leo G. J. van der Ven Roel Leuverink Harmanna Henderiks Ruud van Overbeek 《Progress in Organic Coatings》2003,48(2-4):214-218
The durability of topcoats is dependent on a large number of factors such as polymer composition, stabilization package and the conditions during the weathering process. For obvious reasons, prediction of the long-term (5–10 years) durability of coatings is very important. Some background information concerning the weathering process as well as methods to trace the degradation during exposure is given. The rate-determining factor for the degradation of PUR coatings is photo-oxidation. The photo-oxidation rate (POR) is controlled by the polymer structure but also stabilizers such as hindered amine light stabilizers (HALS) have a large influence. The prediction of the durability of clearcoats is based on tracing of the POR and of the HALS longevity during exposure. The POR is measured using FTIR-PAS. The HALS longevity is determined by ESR. The results show that degradation can be detected much earlier compared to methods as gloss loss and time-to-cracking. Moreover, detection of differences between systems after short exposure times as well as prediction of the long-term durability are possible. Service life prediction (SLP) of clearcoats based on these chemical–analytical methods become more reliable as with the classical approach. 相似文献
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新型双季铵盐杀菌剂的合成及其杀菌性能研究 总被引:1,自引:0,他引:1
以乙二胺、甲酸、甲醇和氯乙酸乙酯为原料,合成了双季铵盐杀菌剂,以绿藻为模型,探讨了双季铵盐的浓度和投加时间对其杀菌性能的影响。结果表明,当双季铵盐的浓度为0.3 g/mL时,杀菌效果较好,3 d可实现79.25%的杀菌率,且投加时间越长,灭菌效果越显著。 相似文献
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瓜儿胶改性及其衍生物在造纸工业的应用 总被引:7,自引:0,他引:7
介绍了瓜儿胶的羟烷基及阳离子醚化改性技术,瓜儿胶与丙烯酰胺、丙烯氰等乙烯基单体的接枝共聚改性,总结了各种引发体系下接枝率,接枝效率等指标的优化条件。论述了瓜儿胶衍生物在造纸湿部作为助留助滤剂、增强剂的应用,并指出今后的发展前景。 相似文献
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用于化妆品中的彩色超细二氧化钛研制 总被引:9,自引:0,他引:9
介绍了一种制备颜色超细二氧化钛的方法。实验以水合氧化铁为改性剂,采用氢氧化钠和醋酸钠为沉淀剂,在以氢氧化钠为沉淀剂的实验中进行了单因素实验,之后对产品进行了分散性和紫外屏蔽性质测定 。 相似文献
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Crack-Growth Resistance of Microcracking Brittle Materials 总被引:15,自引:0,他引:15
A mechanics model of microcrack toughening is presented. The model predicts the magnitude of microcrack toughening as well as the existence of R -curve effects. The toughening is predicated on both the elastic modulus diminution in the microcrack process zone and the dilatation induced by microcracking. The modulus effect is relatively small and process-zone-size-independent. The dilatational effect is potentially more substantial, as well as being the primary source of the R curve. The dilatational contribution is also zone-size-dependent. The analysis demonstrates that microcrack toughening is less potent than transformation toughening. 相似文献