共查询到20条相似文献,搜索用时 62 毫秒
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采用响应曲面优化法(Response surface methodology)以丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为共聚单体,通过自由基聚合对聚丙烯酰胺类共聚物(PDA)进行制备研究。探讨了3个主要因子单体摩尔比、聚合体系p H、引发剂用量的最佳水平及各自变量间的交互作用对PDA得率的影响,通过该法设计得到了最佳优化条件:单体摩尔比n(AM)∶n(DMDAAC)=2.5∶1,聚合体系p H6.00,引发剂用量为单体总质量的1.00%。在模型提供的最优水平下PDA得率89.807%,与预测值91.6944%相吻合,表明所选模型准确、可靠。该方法为聚丙烯酰胺类共聚物的合成及应用提供了依据。 相似文献
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采用氧化还原引发剂和偶氮类引发剂组成复合引发体系,引发两性离子单体(DMAPS)与丙烯酰胺(AM)在盐溶液中进行自由基共聚合反应,获得了甜菜碱型两性离子共聚物P(AM-DMAPS)。采用红外光谱对共聚物进行表征。考察了单体总质量分数、引发剂用量、引发剂各组分摩尔比、反应温度等因素对聚合反应的影响。获得最佳反应条件:单体总质量分数30%,引发剂用量0.025%,反应温度20℃,氧化还原引发剂组分与偶氮引发剂组分的摩尔比1∶3。 相似文献
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水质稳定剂TJ-401的合成及其缓蚀阻垢分散性能研究 总被引:1,自引:0,他引:1
以水为溶剂,采用过氧化物-次磷酸盐为引发体系,用马来酸酐(MA)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、丙烯酸(AA)为单体在水相中合成了四元共聚物TJ-401水质稳定剂。讨论了单体配比、引发剂用量,反应温度等条件对产物缓蚀阻垢分散性能的影响.确定了TJ-401的合成工艺。结果表明:水质稳定剂TJ-401的性能较好,具有优异的阻碳酸钙垢、阻磷酸钙垢、分散三氧化二铁等阻垢分散性能及缓蚀性能,且阻碳酸钙垢性能和缓蚀性能优于TJ-301。 相似文献
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IA/AA/AMPS三元共聚物的合成及阻垢性能研究 总被引:3,自引:2,他引:1
以水作溶剂,过硫酸铵为引发剂,衣康酸(IA)、丙烯酸(AA)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)为单体,合成了IA/AA /AMPS三元共聚物.探讨了引发剂用量、链转移剂用量、反应温度等对共聚物阻垢性能的影响.结果表明,引发剂用量为单体总质量的4.5%,链转移剂用量为单体总质量的9.5%,反应温度为95℃时,共聚... 相似文献
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以过硫酸铵(APS)为引发剂,马来酸酐(MAH)、自制N-聚乙二醇单甲醚-N'-氨基甲酰马来酰亚胺(MPNCM)和甲基丙烯磺酸钠(SMAS)为聚合单体,合成N-聚乙二醇单甲醚-N'-氨基甲酰马来酰亚胺-甲基丙烯磺酸钠-马来酸酐共聚物(SP).通过FI-IR和1H-NMR谱图对SP结构进行表征.以净浆流动度为指标,考察了投料方式、引发剂用量、反应温度、MAH/SMAS摩尔比和MPNCM/SMAS摩尔比对净浆流动度的影响.实验结果表明:最佳反应条件为MPNCM/SMAS摩尔比为1.2,MAH/SMAS摩尔比5.0,并将0.15wt% APS和MPNCM、SMAS缓慢滴加到的MAH水溶液,控制反应温度为60℃.以最佳反应条件制备的SP具有较好的工作性能和分散效果,掺量为0.2wt%时,减水率达26.6%,净浆流动度达288 mm. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献
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