共查询到18条相似文献，搜索用时 62 毫秒
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水泥发泡混凝土具有质轻、隔热性能优良的特点,常作为保温填充材料。提出了一种污泥处理方法,并利用处理后的淤泥与水泥、粉煤灰等材料混合,生产出发泡轻质混凝土,为城市污泥处理问题提供了一种切实可行的减量化、稳定化的处理途径。通过后期的工程实践证明,采用该方法生产的污泥发泡轻质混凝土材料在仓库保温结构中得到了成功的应用。 相似文献
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综述了近年来发泡鞋底材料的研究现状和发展趋势,着重介绍了以聚氯乙烯(PVC)、乙烯-醋酸乙烯酯共聚物(EVA)、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、聚氨酯(PU)为基体的几种典型发泡鞋底材料,并提出发泡鞋底材料应朝着功能化和环保化方向发展的建议。 相似文献
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发泡聚乙烯醇（PVOH）吸液性能研究 总被引：2，自引：0，他引：2
在恒温恒湿条件下对发泡聚乙烯醇（PVOH）试样吸收水、酒精的特性进行了测试分析．结果表明：发泡PVOH试样在承受一定压力的情况下吸水性能略有降低;试样被压缩至8000N后平衡吸水量明显升高;试样自然吸收酒精量约为自然吸水量的5．2倍;吸收酒精后,试样尺寸约增加了20％;压缩至8000N后,再做吸酒精试验,其平衡吸酒精量基本不变,且达到吸收平衡的时间缩短． 相似文献
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利用深度萃取脱油方法制备的高软化点硬沥青材料, 通过熔融共混的方法对聚苯乙烯进行添加改性, 并通过高压渗透发泡剂的方法进行预发泡处理, 对蒸汽发泡后的泡沫聚苯乙烯进行了压缩强度, 吸水性, 发泡倍率等表征, 结果表明硬沥青的添加不会对材料的发泡性能产生影响, 但压缩强度会有所降低。 相似文献
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《淮北师范大学学报》2016,(4)
采用重氮盐法对多壁碳纳米管(MWNT)进行磺化改性,增强碳纳米管在水中的分散性,然后以水为溶剂,以溶液共混法制备高分散性的碳纳米管/聚乙烯醇(MWNT/PVA)纳米复合材料,用红外(FTIR)、扫描电镜(SEM)、热重(TGA)等手段对复合材料的微观结构和性能进行表征和分析.结果表明:该方法可以将碳纳米管均匀地分散在聚乙烯醇(PVA)基体材料中,形成高分散性的碳纳米管/聚乙烯醇纳米复合材料,并且在碳纳米管含量较低的情况下就可以有效地增强聚乙烯醇的耐热性能. 相似文献
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百利包(PrePak)是液态乳制品的一种包装形式,是含有高阻隔材料(EVOH)的五层共挤结构塑料复合包装膜,也有用聚乙烯醇(PVA)高阻隔水性涂布液加工的无菌复合包装膜。文中就百利包纯牛奶这种产品,依据HACCP体系对生产过程进行危害分析,确定了包材灭菌、CIP清洗、原料奶验收、超高温灭菌、无菌灌装、封合成型等六个关键控制点,制定了HACCP计划,确保乳品的安全性。 相似文献
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《实验室研究与探索》2020,(7):24-27
设计了高温高压条件下泡排剂性能评价方法,即重力击打发泡法和通气发泡法,并通过测试市售泡排剂产品对比研究了两种方法适用性。其中重力击打发泡法在高压条件下不适用,高压下垂直下落的液柱分散,击打产生泡沫量不足,且压力越高,液柱分散程度越大。通气发泡法在高温高压条件下适用,测试参数为发泡时间、消泡时间、携液率,110℃、4.5 MPa条件下测试两种泡排剂,并评价出B型泡排剂高温高压条件下稳泡性优于A型泡排剂。 相似文献
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水基化生漆的膜性能研究 总被引：2，自引：0，他引：2
以漆酚基乳化剂（UE）／聚乙烯醇（PVA）混合体系为乳化剂,将天然生漆水基化,并采用扫描电子显微镜（SEM）、热分析（TG）等手段表征水基化生漆（RLE）涂膜．结果表明,水基化生漆膜具有优良的耐化学腐蚀性及耐热性,其物理机械性能与天然生漆相似． 相似文献
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To prevent expanded polystyrene (EPS) beads from rising up to the surface in the molding process of EPS lightweight concrete, vibration with pressure was applied and the polyvinyl acetate (PVA) emulsion was adopted to im-prove its mechanical properties. The mechanical properties, thermal properties and durability of EPS lightweight concrete were tested. The microstructures of EPS lightweight concrete were observed by scanning electron microscope (SEM). Vibration with pressure reduces the number of small cracks. The 180 d compressive strength and flexural strength increase obviously as a large amount of PVA was added. The mixed amount of PVA has no obvious influence on the thermal per-formance when it is not more than 10% of the cement. Vibration with pressure and surface modification of EPS beads by PVA improve the combination of EPS beads with cement stone and the mechanical properties of EPS lightweight con-crete. 相似文献
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以甲醛作交联剂,甘油为增塑剂,用溶液共混法制备了明胶-葡甘聚糖-聚乙烯醇缓释肥料包膜．测定了包膜的吸水率、拉伸强度和断裂伸长率,考察了明胶、葡甘聚糖、聚乙烯醇的质量比,甲醛、甘油用量对包膜的耐水性能和力学性能的影响,同时研究了包膜中尿素的释放性能．结果表明：在50℃下,当甲醛用量为5ml,甘油用量为0．5ml,明胶、葡甘聚糖、聚乙烯醇的质量比为4：3：3时,制备出的包膜综合性能较好,膜中尿素有良好的缓释性能．该条件下包膜中原料之间产生了较强的相互作用,形成了一个较稳定的复合体,且具有良好的缓释性能． 相似文献
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文物防紫外线保护新材料研究 总被引：2，自引：0，他引：2
采用无机纳米复合技术，利用溶胶—凝胶方法的分配交联和紫外线吸收剂的添加等工艺手段，筛选出适于文物保护环境的防紫外线照射，又不影响文物展示效果的羟基苯酮类、苯并三唑类及能有效消除弦光。又不影响观赏效果的聚乙烯醇类新型防护材料，以便用以不同环境下的文物保护工作。 相似文献
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The main thrust of this research was to determine the effectiveness of polyvinyl alcohol (PVA) powder in enhancing the durability of short GFRC materials. Accelerated aging of the materials was achieved through low-pressure steam curing in a moist chamber. The strength and ductility of GFRC were measured by the direct tension test, which showed that incorporation of PVA powder into GFRC could improve its mechanical behaviour and turn it from brittle to ductile. To investigate the mechanism of the tensile strength enhancement, the fiber-matrix interface was examined by polarizing optical microscopy and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDAX). It was found that PVA powder tended to migrate to the fiber-matrix interfacial zone and thus prevented the accumulation of calcium hydroxide in this area. PVA film around the fiber resulted in a more ductile interfacial microstructure and better bonding between fiber and matrix, which should be responsible for enhancing the tensile property and preventing the aging of GFRC. Furthermore, PVA powder reduced the microhardness and brittleness at the interface. 相似文献
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采用表面活性剂与矿物材料物理发泡相结合制备动物蛋白发泡剂,并采用泡浆分开混合法制备泡沫混凝土,考察了发泡剂掺入量对泡沫混凝土干容重、抗压强度、吸水率的影响。实验结果表明,当发泡剂掺入量为1150 mL时,泡沫混凝土的干容重为700 kg·m-3;抗压强度为4 MPa,吸水率为23%,泡沫混凝土的干容重相当于普通水泥混凝土的1/2-1/10。 相似文献
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Selective laser melting (SLM) is one type of additive manufacturing which produces metal parts by powder bed fusion. Since the materials undergo repeated and sharp heating/cooling cycles, the SLMed parts have unique microstructures. The relations among SLM processing parameters, resultant microstructures, and mechanical properties have been investigated by many researchers. However, the wear performance of SLMed materials under various contact conditions has not been carried out until recently. This paper is a presentation of previous and recent research related to wear performance. This is a crucial aspect if SLM is to be expanded to produce friction pairs. Wear rates and mechanisms of the SLMed materials under dry, boundary lubrication, cavitation erosion, and corrosion conditions are discussed and compared with conventionally processed (CP) materials. SLMed materials benefit from fine grains and high hardness, which have higher wear resistance than CP materials. Moreover, a unique tribo-layer on the surface of the SLMed part is found to protect the bulk material under boundary lubrication conditions. An optimized combination of processing parameters increases part density, which further improves the wear resistance. Future work includes studying the influence of pores on the deforming and lubricating behaviors from dry conditions to different lubrication regimes. The final target is to actively control the processing parameters to obtain desirable material properties for improving wear performance. 相似文献
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超细粉体的制备方法 总被引：4，自引：0，他引：4
徐羽展 《浙江教育学院学报》2005,(5):53-59
超细粉体具有一些普通物质所不具备的特性,其中纳米材料具有广泛的应用价值.综述了纳米材料的主要制备方法,包括固相法(机械粉碎法、固相反应法)、液相法(沉淀法、水热法、微乳液法、溶胶凝胶法、水解法、溶剂蒸发法、电化学法)和气相法(气体中蒸发法、气相化学反应法、溅射法、流动油面上真空沉积法、金属蒸气合成法)等.简要讨论了各种制备方法的进展. 相似文献