共查询到20条相似文献,搜索用时 62 毫秒
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对乳化蜡的配方及乳化工艺条件进行了研究,当石蜡质量分数为10%~20%、氧化石蜡质量分数为3%,采用复合乳化剂硬脂酸与三乙醇胺(其质量比为5∶2,用量为7%),在85℃、800~1000r/min的条件下乳化20~30min可制得稳定性高、分散性好的乳化蜡。以此乳化蜡为原料,采用复合防锈剂,当防锈剂A与防锈剂C质量比为3∶1、加入量为6%时,可制得pH值为8~8.5、氨味小、半透明的防锈蜡,其主要性能与国外先进同类产品指标接近。 相似文献
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采用高温静态浸渍法,测定了聚丙焊缝在各类介质中的耐蚀性能,为改进焊接条件和进一步提高设备使用寿命提供参考数据。 相似文献
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对化工研磨行业广泛应用的砂磨锅进行了失效分析、锅壁结构改进及选用新型耐磨耐蚀材料等方面的研究。提出了新型波纹形护板结构砂磨锅和采用MS5铸钢制造砂磨锅,并取得良好的效果。 相似文献
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通过中性盐雾实验、全浸实验和电化学线性极化技术来测定不同镁含量合金镀层的耐蚀性,与现有先进金属镀层进行了耐蚀性比较,对镀层中镁含量与镀层耐蚀性的关系进行了研究,并通过扫描电镜观察镀层表面微观形貌,利用X-ray衍射测定镀层在Na2SO4溶液中的腐蚀产物,对Mg-Zn合金镀层的耐蚀机理进行了初步探讨. 相似文献
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为了克服油基清防蜡剂存在的有毒、易燃、密度小等特点,解决水基清防蜡剂存在的清蜡效率低、防蜡效果差等不足,本研究出具有低毒、不易燃烧、密度较大、清蜡效率高、防蜡效果好等优点的新型乳液型清防蜡剂,为油田的清蜡与防蜡工作、提高原油产量,打下了坚实的基础。 相似文献
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介绍橡胶防护蜡的组成、防护机理、防护效果的影响因素以及研究进展与应用现状。普遍使用的橡胶防护蜡是由石蜡和微晶蜡调配而成的混合蜡;橡胶防护蜡迁移到橡胶表面形成一层致密的保护薄膜,阻挡臭氧分子对橡胶大分子的攻击;橡胶防护蜡的碳数分布和正构烷烃/异构烷烃的比例对其在橡胶表面的防护效果影响较大,其熔点和环境温度也对其迁移有影响。国内橡胶防护蜡产品虽然有了一定的进步和发展,但在产品特性和质量方面与进口橡胶防护蜡产品存在一定的差距,稳定橡胶防护蜡产品原材料的质量以及其与不同橡胶及助剂体系的综合性研究是今后橡胶防护蜡产品开发方向之一。 相似文献
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目前,国内汽车出口在海运过程中主要使用面漆防护蜡对汽车外表面油漆进行保护,但存在使用过程中不环保、费人力、耗材料等一些问题.本文介绍了可剥离水性保护膜的特点、施工应用情况,并对应用效果进行了分析. 相似文献
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A novel granulation technology for producing spherical wax particles that makes use of the insolubility of wax and water is developed. The granulation is stably performed in a granulator with a water‐cooling tower. The granulation process is analyzed and the influences of key factors on the process are studied. Experiments are carried out with 58# semi‐refined wax and 70# crystallitic wax in an experimental granulator which has 118 nozzles (Di = 0.96 mm, Do = 1.28 mm). The process capacity and the corresponding particle diameter are 55–60 kg/h and 4–5 mm, respectively. Using the modified correlation of Scheele and Meister, suitable operation flow rates and the corresponding particle diameters for different nozzles can be predicted. This technology has the following advantages: good particle shape with excellent fluidity, high process capacity and heat‐transfer efficiency, and a small space for the granulator. It is also suitable for producing spherical particles of other materials, which have similar physical properties to wax. 相似文献
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研究防护蜡在轮胎胎侧胶中的应用效果,选用改性防护蜡HG72B和高温防护蜡H7075B与进口防护蜡进行对比。结果表明:在轮胎胎侧胶中添加防护蜡,能改善胶料的加工安全性,显著提高硫化胶的耐屈挠疲劳、耐热氧老化及动态力学性能;3种防护蜡在40 ℃下的臭氧老化防护效果相当;防护蜡HG72B的晶核小,形成的蜡膜致密度和均匀度高、厚薄适中,耐喷霜性能突出;防护蜡HG72B具有优异的50 ℃高温臭氧老化和天候老化防护效果,对于改善胎侧胶的外观具有显著的优势,高温防护蜡H7075B的防护效果略次于防护蜡HG72B,明显优于进口防护蜡。 相似文献
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A fuel for the hybrid rocket system was developed. The attempts made to improve the mechanical properties of wax by adding EVA (ethylene vinyl acetate) are illustrated. It was observed that the mechanical properties obtained by adding EVA to wax were dependent on the process of curing the fuel specimen. A proprietary method of curing the fuel specimen was established. The percentage elongation obtained with 20 % EVA and 80 % of wax was around 17 %, which was much higher than the values obtained with pure wax (4 %). It was observed from the study that the higher the percentage of EVA content in wax was, the better the mechanical properties were. Regression rate studies with EVA and wax combination were carried out. It was observed that the regression rate decreased upon addition of EVA in wax. This reduction was compensated by using a bluff body at the head end. The regression rate obtained with 20 % EVA and 80 % wax even with the use of bluff body is lower than that obtained with pure wax, but is around 3.5 times the regression rate obtained with polymeric fuels. 相似文献