钼酸铵对硅丙乳液防火涂料阻燃抑烟性能的影响

以硅丙乳液为基料,以聚磷酸铵(APP)、季戊四醇(PER)和三聚氰胺(MEL)为阻燃体系,以钼酸铵[(NH4)6Mo7O24·4H2O]为阻燃抑烟协效剂,制备了防火涂料。通过大板燃烧法与热重法(TGA)分析了不同钼酸铵含量的防火涂料的热性能,测试了其烟密度。通过扫描电镜和红外光谱对炭层的微观结构进行了表征。结果表明,钼酸铵对硅丙乳液防火涂料的阻燃抑烟性能影响显著,当APP的质量分数为22.6%、PER为10.2%、MEL为13.6%、钼酸铵含量为0.3%时,所制备的防火涂料的耐燃时间达到65min,残炭量23%,产烟量很低,烟密度等级为21.3。     

粉煤灰对钢结构阻燃涂料的影响

以有机硅改性苯丙乳液为基料,以聚磷酸铵(APP)、季戊四醇(PER)、三聚氰胺(MEL)为阻燃体系,加入粉煤灰作为抑烟剂,制备粉煤灰含量不同的膨胀型钢结构防火涂料并进行耐火性能及烟密度的测试。结果表明,加入粉煤灰的阻燃涂料试样烟密度均降低;部分试样能降低涂料燃烧后的最高温度;部分试样升到最高温度所需时间延长。     

氧化钼与钼酸铵对防火涂料阻燃抑烟性能的影响

以硅丙乳液为基料,聚磷酸铵(APP)、季戊四醇(PER)、三聚氰胺(MEL)为阻燃体系,以氧化钼与钼酸铵为阻燃抑烟协效剂,制备了防火涂料。通过大板燃烧法与热重分析法(TGA)分析了防火涂料的热性能,通过、扫描电镜(SEM)和红外光谱(IR)分析仪分析了炭层的微观结构及成分组成,通过建材烟密度仪测定了其烟密度。结果表明,钼系化合物对硅丙乳液防火涂料的阻燃抑烟性能影响显著,氧化钼与钼酸铵的复配混合物的抑烟效果明显优于它们单独一种的抑烟效果,烟密度等级(SDR)最低,仅为8.7,并对抑烟机理进行了初步探讨。     

羟基磷灰石对聚氨酯防火涂料阻燃抑烟性能的影响

以聚氨酯(PU)清漆为基料,聚磷酸铵(APP)、季戊四醇(PER)、三聚氰胺(MEL)为膨胀阻燃体系,配以高温颜填料钛白粉,加入羟基磷灰石(HAP)作为阻燃抑烟助剂,制备了膨胀型聚氨酯防火涂料。通过模拟大板燃烧和建材烟密度测试仪对耐燃时间和生烟量进行了测试。利用傅里叶红外测试仪(FTIR)和扫描电镜(SEM)对炭层的组成和微观形貌进行了表征,并通过热重分析仪(TGA)对防火涂料的热稳定性进行了表征。结果发现,当HAP的添加量为25.0份时,阻燃和抑烟的综合效果最佳,耐燃时间在150 min以上,烟密度等级降低近13.0。     

水镁石在水性膨胀型钢结构防火涂料中的应用

以防火涂料用典型的膨胀型阻燃体系(APP/PER/MEL)为主,用无机阻燃剂部分替代有机阻燃剂,研究无机填料阻燃剂对膨胀型防火涂料性能的影响,为防火涂料的生产成本控制提供参考。     

水性饰面型防火涂料的制备及其耐火性能研究

以可膨胀石墨(EG)和绢云母为新的阻燃材料,三聚氰胺(MEL)、聚磷酸铵(APP)、季戊四醇(PER)为膨胀阻燃体系,水性乳液为基体制备水性饰面型防火涂料;采用自制高温电炉装置,研究EG与绢云母配比、膨胀阻燃体系、基体拼合对水性饰面防火涂料性能的影响.结果表明,可膨胀石墨和绢云母的质量比为5∶3,APP/MEL/PER的质量比为4∶3∶3,氯偏乳液与纯丙AC261P乳液质量比为22∶3时,制备的防火涂料涂层受热膨胀效果显著,形成了“窝状”构的膨胀炭质层,炭质层孔洞均匀致密,与基材粘附性好、强度高,耐火性能最好,耐火时间高达22min.     

水性钢结构防火涂料的制备及其耐火性能研究

以水性树脂为基体,聚磷酸铵(APP)、三聚氰胺(MEL)、季戊四醇(PER)为膨胀阻燃体系,可膨胀石墨(EG)和绢云母为填料制备了水性膨胀型钢结构防火涂料;研究了基体拼合、膨胀阻燃体系、EG与绢云母配比对钢结构防火涂料性能的影响。结果表明:氯偏乳液与纯丙AC261P乳液质量比为22:3,APP、MEL、PER的质量比为4:3:3,可膨胀石墨和绢云母的质量比为5:3时,制备的防火涂料涂层受热膨胀倍率为5.68倍,形成了"蜂窝状"结构的膨胀炭质层,孔洞均匀致密,与钢板粘附性好、强度高,耐火性能好,耐火极限高达2 997 s。     

钢结构用水性膨胀型防火涂料的制备及性能研究

以高岭土及含锆陶瓷纤维作为增强填料,聚醋酸乙烯酯乳胶和醋叔乳胶的混合液为基料,多聚磷酸铵(APP)、三聚氰胺(MEL)、季戊四醇(PER)为膨胀阻燃体系,开发了一种燃烧后具有高强度膨胀炭层的水性膨胀型防火涂料.研究了乳胶类型、膨胀阻燃体系各组分配比、颜基比、高岭土及含锆陶瓷纤维对水性膨胀型防火涂料性能及炭层强度的影响....     

室内钢结构水性超薄型防火涂料的研制

以聚磷酸铵(APP)、季戊四醇(PER)和三聚氰胺(MEL)为膨胀阻燃体系,醋叔乳液为基料,配以无机增强填料和助剂,制备了水性室内超薄型钢结构防火涂料。讨论了基料、阻燃体系的三组分添加量、阻燃体系与基料比例、颜料和填料对防火性能的影响。结果表明:自制的室内钢结构水性超薄型防火涂料各项技术指标均达到甚至超过GB/T 14907—2002要求,耐火极限达90 min。     

聚苯乙烯的无卤阻燃研究

采用正交设计法分析了聚磷酸胺(APP)、季戊四醇(PER)、三聚氰胺(MEL)作为一种混合体系对聚苯乙烯(PS)的阻燃作用。实验表明,酸源、炭源、气源组成的膨胀型阻燃剂有良好的阻燃效果,PER对PS阻燃性能的影响显著。各个因子对材料力学性能和加工性能的影响不同:PER用量是影响拉伸强度、弯曲强度和流动性的主要因素;APP用量是影响无缺口冲击强度的主要因素;MEL用量是影响缺口冲击强度的主要因素。当APP、PER、MEL 的用量分别为30,20,5摩尔份时,阻燃PS获得较好的综合性能。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

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。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

我国聚碳酸酯工业发展概况

介绍我国聚碳酸酯生产能力和消费需求,对聚碳酸酯在信息工业中的应用作了简短介绍     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

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     

气化给煤系统故障分析

气化给煤装置自投运以来,出现了气化煤仓堵煤、称重给煤机输送皮带因跑偏而损伤以及清扫装置故障频繁等问题,多次造成气化系统减负荷运行。通过对出现的各种问题进行分析,找到了产生这些问题的原因,并有针对性地采用配煤和改进清扫链等措施,使出现的问题得到了极大的改善。     

醋酸纤维素取代基分布与性质的关系

分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。     

Generalization of vdW type of equations of state

1 INTRODUCTIONBecause of importance of equations of state (EOS)in science and industry,hundreds forms of EOS havebeen presented since latter 19th century.It seems impossible to develop a general equation covering vari-ous kinds of EOS.But for cubic EOS,several generalequations have been reported already. Martin presented the first general equation whichis following p=RT/V-α(T)/(υ β)(υ γ) δ(T)/υ(υ β)(υ γ) (1) Kumar et a1.presented an equation called the most general form of a density-cubic or, alterna tively,volume-cubic mathematical equation,the form of which is as follows     

船舶柴油机涡轮增压器的清洗

采用喷射清洗剂的方法，清洗涡轮叶片积炭。