共查询到20条相似文献,搜索用时 187 毫秒
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一、前言潜性固化剂是近年来发展比较迅速的一类环氧树脂固化剂。含有潜性固化剂的环氧树脂配合物,在常温下可贮存较长时间;在加热或其他外来因素作用下,能迅速固化。随着环氧液型胶粘剂、单包装涂料、粉末涂料及注射成型模塑料的开发,以及消除公害、简化操作工艺的要求,使潜性固化剂应用日 相似文献
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本文研究了一类新型含硫阴离子表面活性剂(R-SES)的物化性能,包括表面张力、临界胶束浓度、泡沫性、润湿性、乳化性和分散性。结果表明,这是一类性能优良的表面活性剂。 相似文献
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层状钛基氧化物是一类典型的阳离子型层状材料,因其氧化还原性、层间离子可交换性和作为催化剂载体等特性而成为一类新型的固体催化剂。主要介绍了层状钛基氧化物的制备方法,离子交换、剥离、组装等改性后的材料在催化领域及其他领域的应用。 相似文献
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聚酰亚胺纤维及其应用 总被引:6,自引:0,他引:6
聚酰亚胺纤维以耐辐射性、耐高温性、高强度等优异的性能成为当前高技术纤维的主要品种之一。本文着重介绍聚酰亚胺纤维的结构、性能、制备方法、工艺控制以及产品应用。 相似文献
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Chlorinated polyvinyl chloride (CPVC) is often used in injection molding for products that demand high heat resistance. However, proper control of its flow properties is difficult. To improve flow behavior some internal lubricants are usually used, but they reduce heat resistance of the products. Upper critical solution temperature (UCST) lubricants were found to enhance its flow properties, and also high heat resistance was retained. They act as internal lubricants during processing, improving flow and phase separation during cooling. Therefore they are present essentially as inert filler and thus have little effect on heat distortion temperature. 相似文献
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In this article properties and possible applications of the polyamide from isophthalic acid and hexamethylenediamine are described. This product shows a high transparency, and its mechanical and electrical properties are practically independent of its moisture content. Other typical properties of polyamides such as mechanical strength, impact strength, chemical resistance and tracking resistance are retained. 相似文献
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The potential of di-methyl ether (DME) as an alternative fuel for compression-ignition engines: A review 总被引:1,自引:0,他引:1
This paper reviews the properties and application of di-methyl ether (DME) as a candidate fuel for compression-ignition engines. DME is produced by the conversion of various feedstock such as natural gas, coal, oil residues and bio-mass. To determine the technical feasibility of DME, the review compares its key properties with those of diesel fuel that are relevant to this application. DME’s diesel engine-compatible properties are its high cetane number and low auto-ignition temperature. In addition, its simple chemical structure and high oxygen content result in soot-free combustion in engines. Fuel injection of DME can be achieved through both conventional mechanical and current common-rail systems but requires slight modification of the standard system to prevent corrosion and overcome low lubricity. The spray characteristics of DME enable its application to compression-ignition engines despite some differences in its properties such as easier evaporation and lower density. Overall, the low particulate matter production of DME provides adequate justification for its consideration as a candidate fuel in compression-ignition engines. Recent research and development shows comparable output performance to a diesel fuel led engine but with lower particulate emissions. NOx emissions from DME-fuelled engines can meet future regulations with high exhaust gas recirculation in combination with a lean NOx trap. Although more development work has focused on medium or heavy-duty engines, this paper provides a comprehensive review of the technical feasibility of DME as a candidate fuel for environmentally-friendly compression-ignition engines independent of size or application. 相似文献
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介绍新型高效波纹管水冷器的性能和与其它水冷器对比使用结果,证明这种换热器具有高效、节能的特点。 相似文献
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主要介绍了复合材料夹层结构用泡沫塑料的品种、性能特点、国内外发展情况等。泡沫塑料具有密度低、比强度大、隔音、防震、电绝缘、耐热等特点。同时阐述了泡沫塑料作为复合材料芯材的应用,尤其是在直升机用复合材料芯材的应用。 相似文献
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