不溶性硫磺用稳定剂研究进展

介绍了不溶性硫磺发展历史和形成机理,详述稳定剂对提高不溶性硫磺稳定性的作用机理。按不溶性硫磺生产工序对稳定剂进行了聚合、淬冷、萃取和充油分类,指出不溶性硫磺聚合、淬冷、萃取和充油稳定剂的发展趋势。     

不溶性硫磺的制备技术与工业现状

简要概述了不溶性硫磺的发展历史、形成机理和主要应用,着重从原料预处理、聚合反应、淬冷、固化、萃取和充油等方面阐述了不溶性硫磺的制备技术,并介绍了不溶性硫磺的工业发展现状。     

不溶性硫磺合成方法及生产工艺研究进展

文章介绍了不溶性硫磺的性质、形成机理及合成方法,并对生产过程中高温硫磺淬冷、固化、萃取、充油等工序工艺条件的选取作了较详细的讨论,指出了高含量（高转化率）、高温稳定性、高分散性、低静电、防爆、防腐、节能环保是不溶性硫磺产品未来的发展方向。     

不溶性硫黄的制备技术

以普通硫黄为原料,考察了低温熔融法工艺条件、稳定剂的加入、填充油和萃取剂的选择对不溶性硫黄(IS)含量、收率及产品稳定性的影响.结果表明,适宜的聚合工艺条件为:聚合温度为260℃,聚合时间为1h,室温去离子水作为淬冷液,固化温度为60℃,固化时间为4h,硫黄聚合转化为IS可达40%以上;聚合产品的固化过程、提高萃取温度以及在淬冷、萃取、充油过程中稳定剂的加入能较显著提高产品的稳定性;溶剂SL可以替代二硫化碳成为新的萃取剂并确定了其相应的萃取工艺条件.确定了淬冷液、萃取剂、填充油中适宜的稳定剂及其添加量,最终IS产品120℃、15min时的热稳定性达到49%以上,居同类工艺领先水平.     

不溶性硫黄的生产技术进展

介绍不溶性硫黄的生产方法,对比气化法和熔融法2种主流方法的优缺点。介绍不溶性硫黄的生产工艺过程中淬冷、固化、萃取提纯、充油等步骤。按用途和类型归纳不溶性硫黄用稳定剂的研究进展,展望我国不溶性硫黄的发展前景并提出建议。     

低温熔融法不溶性硫磺的生产工艺

介绍了低温熔融法生产不溶性硫磺新工艺。该工艺主要分为4个工序:(1)中品位不溶性硫磺的制备;(2)高品位不溶性硫磺的制备;(3)充油型不溶性硫磺的制备;(4)萃取剂的蒸发回收利用。制备的充油型不溶性硫磺性能指标优于化工行业标准HG/T2525-93,产品高温稳定性达到90%以上。     

二流体雾化喷枪在不溶性硫磺生产中的应用

不溶性硫磺（又称聚合硫或μ形硫）是指不溶于二硫化碳的聚合硫磺,其相对分子质量约30000。不溶性硫磺分充油型和非充油型两大类,橡胶工业中使用的不溶性硫磺绝大多数为充油型产品。充油型不溶性硫磺具有在胶料中分散性好、制品硫化交联点均匀的特性,因此用不溶性硫磺硫化的橡胶具有很好的不喷霜性,并能有效预防胶料焦烧、增进橡胶与钢丝或化纤帘子线的粘合。不溶性硫磺的生产方法主要有接触法、气化法、低温液相法等,目前气化法使用较多;     

不溶性硫磺淬冷新工艺和稳定剂的研究

不溶性硫磺简称μ硫,是生产子午线轮胎的专用硫化剂。本论文以山东华鲁恒升化工股份有限公司硫回收工艺中生产的硫磺为原料,采用低温熔融法制备不溶性硫磺,研究了淬冷工艺及稳定剂对不溶硫磺物性的影响,并对制得的产品进行表征。根据μ硫聚合机理以及熔融法反应条件,从多种稳定剂中筛选出效果较好的Si O_2、纳米Si O_2、苯甲酸和对氯苯甲酸四种稳定剂做重点研究,研究不同种类的稳定剂对不溶性硫磺物性的影响,并对最佳添加量进行了研究。实验结果显示对氯苯甲酸是最有效的稳定剂。     

不溶性硫磺的萃取和热稳定性研究

研究了用二硫化碳作萃取剂时萃取时间、萃取温度、萃取剂用量等因素对不溶性硫磺含量的影响,并考察多种稳定剂对不溶性硫磺热稳定性的影响。试验结果表明,在室温条件下萃取时间60 min、不溶性硫磺粗品与二硫化碳质量比1：5时,可获得不溶性硫磺质量分数90%以上的高品质不溶性硫磺产品。在105℃石蜡油恒温15 min条件下,采用橡胶促进剂类复合稳定剂和有机锡类复合稳定剂时试样的热稳定性较好,最高分别达到90.27%和94.77%。     

不溶性硫磺低温熔融法聚合工艺研究

研究了不溶性硫磺低温熔融法聚合工艺,考察熔融聚合温度、聚合反应时间、升温速率、淬冷液温度等不同工艺条件对不溶性硫磺含量的影响,得到最佳工艺参数。     

Flame-retardant poly(ethylene terephthalate)

Poly(ethylene terephthalate) containing hexabromobenzene, tricresyl phosphate, or a combination of triphenyl phosphate and hexabromobenzene, pentabromotoluene, or octabromobiphenyl was extruded or spun at 280°C into monofilaments or low-denier yarn, respectively. Only combinations of the phosphorus- and halogen-containing compounds resulted in flame-retardant poly(ethylene terephthalate) systems, without depreciating their degree of luster and color quality. The melting temperature, the reduced viscosity, and the thermal stability above 400°C of these flame-retardant systems were in most cases comparable to those of poly(ethylene terephthalate) itself. Phosphorus-bromine synergism was proposed with flame inhibition occurring mostly in the gas phase.     

用二苄基甲苯代替氢化三联苯作高温导热油的研究

二苄基甲苯沸点高,凝固点低,热稳定性好,其理化及热学性质与氢化三联苯相近。研究证明,可用二苄基甲苯代替氢化三联苯或者两者掺混作高温导热油使用。     

Obtaining Solid Extractants Based on Mixtures of Tributylphosphate and Molecular Iodine and Researching the Extraction of Scandium from Chloride Solutions

Theoretical Foundations of Chemical Engineering - SOLEX, a solid extractant for extracting metal chlorides from solutions, has been obtained by impregnating tributyl phosphate (TBP) and iodine into...     

改性硅基杂化介孔材料阻燃PC/ABS研究

将自制的9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)接枝硅基杂化介孔材料(DM)、三苯基磷酸酯(TPP)和聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯塑料(ABS)共混制得阻燃PC/ABS复合材料。研究表明,当DM和TPP的质量分数为2%和6%时,复合材料的氧指数为28%,并达到UL 94 V-0阻燃级别;锥形量热仪进一步分析证实PC/ABS/TPP/DM体系的最大热释放速率和总热释放量均有大幅度下降;通过对炭层形貌及结构的研究表明,DM和TPP具有很好的协效作用,在燃烧过程中能促进PC/ABS复合材料生成微观致密的炭层,增强了PC/ABS复合材料的热稳定性。     

2,4,6-三溴苯胺对环氧固化物阻燃耐热性的影响

用氧指数(LOI)、TG法研究了2,4,6 三溴苯胺(TBA)对环氧树脂酸酐固化物阻燃耐热性的影响,结果表明TBA有较好的阻燃效果,其与Sb2O3和磷酸三苯酯(TPP)配用时具有协同阻燃效应,且对环氧树脂酸酐固化物的热稳定性影响较小。     

磷酸三苯酯改性酚醛纤维的制备及其性能研究

以磷酸三苯酯改性酚醛树脂为原料,采用熔融纺丝法制备出改性酚醛纤维,并对改性酚醛纤维的结构和性能进行了研究。结果表明:与纯酚醛纤维相比,磷酸三苯酯改性后的酚醛纤维韧性增加,其阻燃性和热稳定性明显提高;当磷酸三苯酯质量分数为7%时,改性酚醛纤维拉伸强度为114.2 MPa,弹性模量为3217 MPa,极限氧指数提高至41.86%,在空气气氛下600℃的残炭率增至75.0%,在氮气气氛下800℃的残炭率增至69.4%。     

Effect of minor addition of xanthan on cross‐linking of rice starches by dry heating with phosphate salts

Effects of xanthan on the crosslinking of normal and waxy rice starches using a mixture of phosphate salts (sodium trimetaphosphate and sodium tripolyphosphate, 99 : 1, dry solid basis) were investigated. The starch (158.4 g, dry solids) was dispersed in an aqueous solution containing xanthan and phosphate salts (1.6 and 0.6 g in 280 mL water, respectively), and the slurry was dried overnight at 45°C until the moisture content was less than 10%. The dry cake was then ground into powders and heated for 2 h at 130°C in a convection oven. The pasting viscosity, paste clarity, melting and in vitro digestion behaviors of the starches with modifying agents (xanthan and phosphate salts) were investigated. The heat treated starches displayed enhanced shear stability and reduced breakdown, as evidences of crosslinking. Xanthan (1.0% based on starch solids) enhanced the crosslinking effects in the viscosity profile. Waxy rice starch evidenced more profound viscosity changes than did normal rice starch, indicating it was more susceptible to the heat treatment. The waxy rice starch heated with the mixture of phosphate salts and xanthan exhibited a continuous increase in pasting viscosity without any breakdown. Under a DSC analysis, melting enthalpy decreased but melting temperature increased somewhat as results of the heat treatment with xanthan. In an in vitro digestion analysis, the starches treated with xanthan exhibited decreases in the maximum digestion level, and increases in the resistant starch (RS) content. Dry heating, however, increased the digestion rate and glycemic index (GI) regardless of the presence of phosphate salts or xanthan indicating that the starches were thermally degraded. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

New halogen‐free fire retardant for engineering plastic applications

A comparative study of the fire‐retardant efficiency of three commercial aryl phosphates—triphenyl phosphate (TPP), resorcinol bis(diphenyl phosphate) (RDP) and bisphenol A bis(diphenyl phosphate) (BDP)—in PC/ABS blends was carried out. The thermal and hydrolytic stability of the fire‐retardant resins, as well as their physical properties, was also studied. The use of RDP and BDP is preferred over TPP because of superior properties, whereas BDP shows better fire‐retardant efficiency, hydrolytic stability, and thermal stability than RDP.     

硝酸对硝基苯热稳定性的影响机理

引言硝基苯是重要的化工产品,主要用作生产苯胺的原料、橡胶硫化促进剂及其他有机合成的中间体[1]。在硝基苯的生产、储存、使用等过程中可能由于工艺波动或操作失误等原因混入一些杂质,这些杂质会影响硝基苯的热分解特性,有些还会加速其热分解过程,如果体系放热速度大于向环境的散     

碱洗粗磷酸三苯酯工艺研究

为了解决水洗粗磷酸三苯酯造成下水的酸，酚污染，介绍了新的工艺方法－碱洗法。