共查询到18条相似文献,搜索用时 93 毫秒
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对于高品质的滑雪蜡来说,其防水程度是提升速度的关键。有很多不同的添加剂被用来增强滑雪蜡配方的防水性和耐久性,其中最受欢迎的添加剂便是氟化物添加剂。遗憾的是,此类添加剂不能很好地溶解在蜡基质中,这就限制了其应用。作为各个国家/地区参赛队伍的滑雪蜡供应商之一———HOLMENKOL公司力求找到一种新的途径,使滑雪蜡技术能够突破现有添加剂的局限性。在试用了来自GE拜耳有机硅实验室(GE Bayer Silicone Laboratories)的硅油后,HOLMENKOL/GE联合小组发现一种刚好具有所需化学性质的候选材料。GE的这种有机硅材料不仅增强了… 相似文献
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氯化石蜡是氯碱厂平衡氯气生产的一个重要系列产品。制1吨氯蜡—70,耗氯1.4吨左右。氯化石蜡在国民经济各部门获得广泛的应用,如用作涂料、油墨的添加剂,塑料、橡胶的添加型阻燃剂,织物的防火、防水处理剂等。下面简要介绍氯化石蜡的制造方法及其应用。 相似文献
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本文围绕提高涂料的高装饰性,采用新型添加剂-蜡粉,在不同品种中对添加剂的选择及使用方法等进行了探讨。 相似文献
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考虑蜡沉积影响因素的复杂性和最小二乘支持向量机在小样本预测方面的优势,基于最小二乘支持向量机预测的原理,通过优化最小二乘支持向量机的参数,建立了蜡沉积速率的预测模型,并对蜡沉积速率进行了预测。结果表明:该方法在样本数量较小时仍具有较高的精度,蜡沉积速率的预测值和实验值的吻合程度较好;最小二乘支持向量机建模时可以得到直观的函数表达式,而神经网络方法却不能得到模型的显式表达式,因此该方法具有明显的优势;应用径向基核(RBF)作为核函数时,不同初值的正则化参数?和核函数宽度?对预测结果具有较大影响,使用时应合理选择。 相似文献
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Rice bran oil (RBO) is well known for its high wax content (2–4%). A good separation of waxes must be ensured through the
formation of crystals that can be removed with a minimal retention of oil to maintain high yields of refined oil. In the present
study, the form and size distribution of RBO wax crystals were investigated using a laser diffraction technique. An attempt
was made to study the effect of cooling on growth and size distribution of RBO wax crystals in hexane medium, and it showed
that high cooling rate and low temperature induces the formation of a great number of small nuclei. In addition, experiments
were performed to evaluate the effect on the growth of wax crystals of successive additions of gum and pure TG to the medium.
The entire experiment was designed to optimize the temperature and incubation time of wax crystallization to facilitate the
efficient separation of wax from crude RBO-hexane miscella using membrane technology. 相似文献
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G. Rivarola M. C. Añón A. Calvelo 《Journal of the American Oil Chemists' Society》1985,62(10):1508-1513
Cooling conditions and wax content in oil determine the morphologies adopted by crystals. At high cooling rates (K) and low
temperatures of the refrigerant (Tf), nucleation temperatures are low. This induces the formation of a great number of small nuclei. However, at low K and high
Tf, nucleation temperatures are high, producing a few large nuclei. The wax/oil equilibrium curve was determined; it allows
the evaluation of the wax remaining in the oil after a given treatment. In addition, experiments were performed to evaluate
crystal separation from oil. The increase of temperature from 10 to 25 C and the presence of soaps in the oil facilitate wax
separation. These results give additional information that can improve operating conditions and make the choice of technological
alternatives in wax separation easier. 相似文献
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从水泥基渗透结晶防水材料的基本性能出发,通过数据分析提出该种材料在预防建筑物二次渗漏防水性能方面作用在逐步减小;从水泥颗粒28天水化深度结合激光粒径分析仪数据,推算出建筑物残余有效水泥含量已经非常低,水泥基渗透结晶防水材料活性物质水化反应原材料需求不足;根据规范提出的施工方法,推断出水泥基渗透结晶防水材料在建筑物二次渗漏防水时因可参与反应的原料过少其防水性能已经失效。 相似文献
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水泥基渗透结晶型防水涂料是一种新型防水涂料,在混凝土中可以形成不溶于水的结晶体,填塞毛细孔道,使混凝土致密、防水,提高混凝土的耐久性。本研究通过正交试验配制水泥基渗透结晶型防水涂料,研究了不同的材料组成对其力学性能的影响,从而为水泥基渗透结晶型防水涂料的研究开发以及产品的优化提供理论依据。 相似文献
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Wax deposition, precipitation, and gelation make the transport of crude oil in pipelines challenging. The effect of several ethylene copolymers, and small molecules with a long alkyl chain, on wax formation was investigated for n-C32H66 in decane and de-aromatized white oil. Addition of a small amount of EVA (ethylene-co-vinyl acetate) copolymers delayed nucleation by reducing the onset temperature and the wax appearance temperature. They modified the wax crystal-structure and morphology from large plates to tiny particles by adsorbing to the wax surfaces and inhibiting growth. Viscosity and the pour-point were improved by inhibiting the formation of large aggregates. It was demonstrated that the content of vinyl acetate groups in EVA copolymers affected wax crystallization. The small molecules, propylene copolymers, and ethylene copolymers with ethyl acrylate, maleic anhydride, and ethylene glycol showed a weak inhibiting effect. The effect of wax inhibitors was determined by the content and by the type of structure-disturbing groups in the copolymers. 相似文献
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介绍了防水透湿织物的分类方法,按防水透湿机理介绍了三类防水透湿织物的现状,并展望了防水透湿技术的发展趋势。 相似文献