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软聚氯乙烯的阻燃抑烟研究 总被引:5,自引:0,他引:5
本文借助氧指数法,差热分析,热重分析研究了Al(OH)3,Mg(OH)2,Sb2O3对软质PVC的阻燃作用和锌化合物对软PVC的抑烟作用。结果表明,Sb2O3对软PVC的阻燃效果优于Al(OH)3和Mg(OH)2的;由Sb2O3,CaCO3和锌化合物组成的阻燃抑烟体系,对软PVC具有良好的阻燃抑烟效果。 相似文献
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无机阻燃剂对软PVC阻燃消烟的研究 总被引:2,自引:0,他引:2
用氧指数法、垂直燃烧法研究了无机阻燃剂Al(OH)3、Mg(OH)2、ZnO、MgO、Sb2O3在软PVC中的阻燃消烟作用。实践结果表明:ZnO对软PVC的阻燃消烟作用优于其它阻燃剂,对制品的综合性能影响较小。 相似文献
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本文增补和修订了适用于芳烃的UNIFAC基因相互作用参数(aCHO,COOH,aCOOH,CHO);(aAcCH2,CHO、aCHC,AcCH2);(aAcCH2,COOH、aCOOH,AcCH2)。将其用于计算甲苯、苯甲醛、苯甲酸体系三对二元VLE和预测三元VLE数据,均获得令人满意的拟合结果。 相似文献
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1—2折流换热器流体温度沿程变化及其LMTD的计算 总被引:1,自引:0,他引:1
1-2折流换热器流体温度沿程变化及其LMTD的计算梁日忠THEVARIATIONOFFLUIDTEMPERATUREALONGSIDPASSANDTHECALUATIONOFLMTDIN1-2BAFFLEHEATEXCHANGER1前言换热器设计中,... 相似文献
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本文讨论了影响PVAc醇解的主要因素,并采用气压式毛细管流变仪测定了部分醇解PVAc-CH3OH溶液的流变性能。结果表明:PVAc的醇解度均随NaOH浓度,醇解温度和醇解时间的增加而增加。 相似文献
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马来酸酐接枝PVC及PVC—g—MAH/CaCO3体系性能的研究 总被引:1,自引:0,他引:1
通过在挤出机中熔融反应,将马来酸酐接枝到PVC分子链上,并研究了PVC-g-MAH/CaCO3体系的力学性能和树热性能。红外光谱证明MAH基团被引入了PVC分子链上,并验证MAH是通过打开C=C双链参与反应。PVC-g-MAH/CaCO3的维卡软化点略高于PVC/CaCO3。 相似文献
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对磷酸盐类化学结合陶瓷材料,根据所用原料的不同将其划分为不同的几个体系进行了综述。重点介绍了Al2O3-P2O5-H2O、MgO-P2O5-H2O、ZnO-P2O5-H2O、ChO-P2O5-H2O、CaO-Al2O3-P2O5H2O和CaO-SiO2-P2O5-H2O等体系中材料的制备方法、显微结构、反应机理及性能特点。由于磷酸盐类化学结合陶瓷材料具有低温制备、性能良好等特点,因而具有广阔的应用前景和发展前途。 相似文献
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采用钛盐光度法测定O3/H2O2系统中的/H2O2,考察了pH值、O3/H2O2摩尔比、钛盐用量和显色时间的影响,确定了最佳的测定条件;通过加标回收率实验和对比实验,证明了该方法的可靠性.结果表明,pH值为3.0、λ=385nm、草酸钛钾浓度2.5mmol·L-1和显色时间8min条件下,H2O2浓度0~45mg·L-... 相似文献
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为制备出高纯度氧化锂,首先从单水氢氧化锂与过氧化氢的摩尔比、反应温度、乙醇与过氧化氢体积比三个方面对锂回收率的影响进行研究,得到合成过氧化锂的最佳工艺条件;然后在过氧化锂热分解过程中,从焙烧温度、焙烧时间对锂转化率的影响进行分析,从而得到了最佳焙烧条件;最终得到合成高纯度氧化锂的最佳工艺条件。 相似文献
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通过测试盖玻片对水的动态接触角,研究不同的化学清洗、晾干和烘干以及烘干时间对盖玻片的亲水性的影响。结果表明,在食人鱼溶液、氨水双氧水溶液(H2O2/NH4OH/H2O,1∶1∶5,体积比)、盐酸双氧水溶液(HCl/H2O2/H2O,1∶1∶6,体积比)和NaOH溶液(5%)等4种洗涤液中,用食人鱼溶液清洗或依次用食人鱼溶液、氨水双氧水溶液和盐酸双氧水溶液清洗的盖玻片的亲水性较好;长时间晾干或烘干皆对亲水性不利,高温烘干,最好选择100℃、1~2 h。 相似文献
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An atomic-level insight into the H2 adsorption and oxidation on the Fe2O3 surface during chemical-looping combustion was provided on the basis of density functional theory calculations in this study.The results indicated that H2 molecule most likely chemisorbs on the Fe2O3 surface in a dissociative mode.The decomposed H atoms then could adsorb on the Fe and O atoms or on the two neighboring O atoms of the surface.In particular,the H2 molecule adsorbed on an O top site could directly form H2O precursor on the O3-terminated surface.Further,the newly formed H-O bond was activated,and the H atom could migrate from one O site to another,consequently forming the H2O precursor.In the H2 oxidation process,the decomposition of H2 molecule was the rate-determining step for the O3-terminated surface with an activation energy of 1.53 eV.However,the formation of H2O was the rate-determining step for the Fe-terminated surface with an activation energy of 1.64 eV.The Fe-terminated surface is less energetically favorable for H2 oxidation than that the O3-terminated surface owing to the steric hindrance of Fe atom.These results provide a fundamental understanding about the reaction mechanism of Fe2O3 with H2,which is helpful for the rational design of Fe-based oxygen car-rier and the usage of green energy resource such as H2. 相似文献
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采用电化学方法研究钛和过氧钛三取代:α—K8H2[SiW9TiO40]·15H2O,β-K7H3[SiW9Ti3O40]·15H2O,α—K9H2[SiW9(TiO2)3O37]·12H2O,β—K8H2[SiW9(TiO2)3O37]·10H2O,K9[PW9Ti3O40]·5H2O和K9[PW9(TiO2)3O37]·10H2O的氧化还原性质。实验结果表明:过氧型杂多配合物的氧化性大于非过氧型的氧化性。对于Keggin结构的同一类型杂多配合物当中心离子不同时对其氧化性有影响。当中心离子为P时其氧化性强。对同一类型杂多酸盐,当为α和β两种异构体时,一般β型的氧化性大于α型。 相似文献
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The performance of UV/H2O2, UV/O3, and UV/H2O2/O3 oxidation systems for the treatment of municipal solid-waste landfill leachate was investigated. Main objective of the experiment was to remove total organic carbon (TOC), non-biodegradable organic compounds (NBDOC) and color. In UV/H2O2 oxidation experiment, with the increase of H2O2 dosage, removal efficiencies of TOC and color along with the ratio of biochemical oxygen demand (BOD) to chemical oxygen demand (COD) of the effluent were increased and a better performance was obtained than the system H2O2 alone. In UV/H2O2 oxidation, under the optimum condition H2O2 (0.2 time), removal efficiencies of TOC and color were 78.9% and 95.5%, respectively, and BOD/COD ratio was significantly increased from 0.112 to 0.366. In UV/O3 oxidation, with the increase of O3 dosage, removal efficiencies of TOC and color along with BOD/COD ratio of the effluent were increased and a better performance was obtained than the system O3 alone. Under the optimum condition UV/O3 相似文献
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O_3/H_2O_2法处理印染废水二级出水的试验研究 总被引:1,自引:0,他引:1
H2O2协同臭氧氧化实验中,对于初始pH值为6.8的500 mL废水,在臭氧投加量为48 mg,0.1 mL H2O2在反应前加注到反应器的条件下,O3/H2O2工艺的COD cr去除率比臭氧单独氧化提高了7.9%。对于O3/H2O2工艺,其最佳H2O2投加量随废水pH值的增加而减少;一次投加H2O2方式的COD cr去除率在大部分时间内都好于间歇投加H2O2方式。 相似文献