共查询到20条相似文献,搜索用时 78 毫秒
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对比研究牌号为SE6660,SE6635和SE5563U的甲基乙烯基苯基硅橡胶(简称苯基硅橡胶)及其硫化剂DCBP和DBPH对航空航天领域的适用性。结果表明:SE5563U苯基硅橡胶的综合性能较好;采用硫化剂DBPH的SE5563U苯基硅橡胶交联密度大,抗撕裂性能好,压缩永久变形小,脆化温度为-110℃,非常适用于航空航天器材门窗系统密封材料。 相似文献
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在酸催化下,由乙醇与棕榈油反应制出了棕榈酸乙酯。在催化剂和乳化剂存在下,以棕榈酸乙酯、蔗糖为原料酯交换法合成出了蔗糖棕榈酸酯(SE),用红外光谱、激光电离质谱对SE进行了分析表征,详细考察了蔗糖粒度,乳化剂、催化剂用量,反应温度、压力及时间,原料配比等因素对SE产率的影响。通过制成易挥发衍生物方法,建立了分析SE组成的气相色谱方法。用正交实验法优化出了较佳合成条件,即n(棕榈酸乙酯)∶n(蔗糖)=3∶1,m(催化剂)∶m(蔗糖)=0 08∶1,m(乳化剂)∶m(反应物料)=0 12∶1,温度~125℃,压力~2 67kPa,时间~4h。该条件下,SE产率(以蔗糖计)在73 6%以上。 相似文献
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随着汽车制造业迅猛发展,全球汽车制造企业之间的竞争日趋激烈,如何加快产品研发速度,缩短开发周期,降低研发和制造成本,快速适应市场需求与变化是每个整车企业都在研究的课题。同步工程工作的开展对解决上述问题是一个有效的工作方法,同步工程对汽车产品及相关过程进行平行、一体化的设计,在产品的设计阶段提早预报和发现存在的影响产品制造、质量、销售等的缺陷,并及时给予改进。这一工艺工作方法现在正在被汽车企业所认识、引进和应用。在此介绍了根据从事汽车涂装同步工程过程中的一些经验,以及同步工程工作中的理论分析与思路,希望对同行业工程师有所借鉴。 相似文献
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从轿车车身部件的性能和工艺等方面对塑料的性能特点进行了讨论,介绍了目前塑料车身部件的应用现状和发展趋势。 相似文献
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轿车级RTM制品制造技术 总被引:2,自引:0,他引:2
本文针对轿车级FRP产品结构复杂、表面质量和尺寸精度要求高等特点,结合富康ZX轿车后举升门的研制,重点研究了轿车级RTM制品的模具设计与制造、原辅材料选用、工艺控制、性能测试与评价等技术关键。 相似文献
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Laraib Alam Khan Ali Hasan Mahmood Bilal Hassan Tahir Sharif Shahaab Khushnod Zaffar M. Khan 《Polymer Composites》2014,35(1):97-104
The advanced composite materials are increasingly being used in the automotives for their ultralight physical properties and super strong mechanical properties. This research examines the cost‐effective single‐step liquid resin infusion manufacturing process for developing all composite car body as the generally used sheet molding compound manufacturing process is highly capital intensive. Three different scaled down models of the Eco car were developed focusing on minimal weight and air drag coupled with aesthetics. Structural design and analysis was carried out using the Pro/E and Ansys tools. The Pro‐E model was scaled up to generate computer‐aided drafting drawings for tool development. Different stations were marked on the model and sliced virtually for development of pattern. Moreover, the mold was manufactured from carbon and glass/polyester composites for prototype manufacturing of the car body. This involved manual placement of desired number of carbon layers as preform on female side of the mold. The vacuum sucked the resin through a number of carefully selected entry ports which ensured effective resin distribution and impregnation. Polycarbonate wind shield was thermoformed in the convection oven according to streamlined geometry of car body and hinged. The car body was integrated with the compatible floor panels and accessories. The crumble zone shock absorber in the bumper was manufactured using successive layers of nomax honeycomb and polyvinyl chloride rigid foam to dampen the accidental shock. The car performed remarkably well in the Eco marathon race held at Malaysia, 35:97–104, 2014. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers 相似文献
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国外汽车涂装新技术点滴 总被引:1,自引:0,他引:1
将德国、美国、日本、比利时、加拿大等国外十几家汽车厂在涂装材料、涂装工艺、涂装设备及涂层质量测试方面的最新进展,向国内同行作了全新的介绍 相似文献