无溶剂法合成二月桂酸二丁基锡催干剂及性能研究

以月桂酸、二丁基氧化锡为起始原料,无溶剂反应,生成二月桂酸二丁基锡,通过红外光谱(IR)、电感耦合等离子体原子发射光谱法(ICP-AES)确定化合物结构及锡含量。二月桂酸二丁基锡对AC-1017树脂有明显催干作用,随着用量的增加,表干时间越来越短,硬度均为F。     

热稳定剂二月桂酸二丁基锡合成工艺改进

对新型热稳定剂二月桂酸二丁基锡合成条件进行了研究。根据直接法合成二月桂酸二丁基锡的反应机理,通过改变反应温度、反应时间和配料比,并对实验方法作了一定的改进。当碘丁烷13g,Sn粉3g,四丁基溴化铵0.7g时,反应温度为125～140℃,反应时间为4h,二月桂酸二正丁基锡产量为12.8g,产率为98.8%。分别加入了20mL水和20mL甲烷进行萃取分离后使二月桂酸二正丁基锡最终产率可达到80%以上。     

二月桂酸二丁基锡催化合成通用型不饱和聚酯树脂

介绍了二月桂酸二丁基锡催化合成通用型不饱和聚酯树脂的新工艺，克服了传统工艺的缺点，可加快反应速度，提高产品的质量。讨论了二月桂酸二丁基锡催化剂存在下反应条件对缩聚反应的影响。确定了适宜的催化剂用量和反应温度。     

二月桂酸二丁基锡的应用及研究进展

二月桂酸二丁基锡作为一种具有性能优异的有机锡添加剂,在工业、农业等各个领域都获得了广泛的应用.简要介绍了二月桂酸二丁基锡在聚氯乙烯、聚氨酯及其他行业的应用情况和研究进展,并对其在各个领域的应用情况进行了展望.     

二月桂酸二丁基锡催化合成不饱和聚酯涂料的新工艺研究

本文研究了二月桂酸二丁基锡催化合成通用型不饱和聚酯树脂的新工艺。通过反应温度、催化剂用量、反应时间、原料配比、真空度等反应条件的改变,讨论了二月桂酸二丁基锡催化剂存在下反应条件对缩聚的影响。并用旋转黏度计法测定产物黏度,用加热烘焙法测定产物的含固量。从而确定适宜的催化剂用量和反应温度。实验结果表明,用二月桂酸二丁基锡催化合成不饱和聚酯涂料的新工艺,克服了传统工艺的缺点,可加快反应速度,降低反应温度,提高产品的质量。另外,先加入邻苯二甲酸酐,后加入活性较好的顺丁烯二酸酐也有利于反应的顺利进行。     

热稳定剂二月桂酸二丁基锡合成工艺改进

在PVC的加工过程中，加工温度高于其热分解温度。为此人们进行了大量的研究工作，发现如果聚氯乙烯塑料中含有少量的诸如铅盐、金属皂、酚、芳胺等杂质时，既不影响其加工性能和应用，又能在一定程度上起到延缓其热分解的作用，从而促使了热稳定剂研究领域的发展。二月桂酸二丁基锡是一种新型热稳定剂，值得研究。陕西科技大学化学与化工学院郭睿和吴从华等用三步法合成了该热稳定剂。     

正二月桂基酰亚胺合成与表征

以月桂酸为原料合成了正二月桂基酰亚胺,并用红外,紫外,核磁共振,质谱,元素分析等手段对其结构进行了表征。     

三月桂酸单丁基锡对PVC热稳定性的影响

用刚果红试纸测试含有三月桂酸单丁基锡和二月桂酸二丁基锡的PVC的静态热稳定性和脱HCl温度。研究发现:采用三月桂酸单丁基锡,PVC的初期热稳定性优于二月桂酸二丁基锡,而长期热稳定性略差于二月桂酸二丁基锡;采用三月桂酸单丁基锡,PVC的脱HCl温度与含有二月桂酸二丁基锡的大致一样。用Brabender流变仪测试含有三月桂酸单丁基锡和二月桂酸二丁基锡的PVC的润滑性和动态热稳定性,根据流变仪扭矩的大小进行分析可知,三月桂酸单丁基锡的润滑性低于二月桂酸二丁基锡;采用三月桂酸单丁基锡后,PVC的动态热稳定性劣于二月桂酸二丁基锡。     

2,3,4,5-四溴邻苯二甲酸二丁基锡的合成及表征

以２,３,４,５ 四溴邻苯二甲酸酐和二丁基氧化锡为原料,以四氢呋喃为溶剂,于６０℃反应１６ｈ。合成了２,３,４,５ 四溴邻苯二甲酸二丁基锡,其产率可达８３８％。产物用１ＨＮＭＲ、１３ＣＮ ＭＲ、ＩＲ及元素分析进行了表征。     

磷酸二月桂酯及其盐的合成研究

研究了以三氯氧磷与月桂醇为原料合成磷酸二月桂酯(C12-DAP)及其盐的工艺条件,考察了反应温度、反应时间和物料配比等因素对酯化反应与水解反应进程的影响,通过优化实验方法,选择了适宜的合成工艺条件。磷酸二月桂酯可定量转化为磷酸二月桂酯钠盐。     

Cure kinetics of cyanate ester resin using microencapsulated dibutyltin dilaurate as catalyst

Dibutyltin dilaurate (DBTDL) catalyst-filled microcapsules (MCs) were used to catalyze the reaction of thermosetting cyanate ester (CE) resins. Dynamic differential scanning calorimetry (DSC) experiments were performed at multiple heating rates (β) to investigate the effects of the MC content (0.125, 0.25, and 0.5 %) on the cure kinetics of CE resins. The kinetic parameters of CE/MC systems, including activation energy (E _a), preexponential factor (A), and reaction order (n), were analyzed using the Flynn–Wall–Ozawa method, Kissinger method, Crane method, Ozawa isoconversional method, and Coats–Redfern method. The results indicate that, as the MC content increases, the reaction temperature of CE/MC system gradually shifts to low temperature owing to the increase of the DBTDL catalyst released from MCs under heating conditions. Compared to the unencapsulated DBTDL, the encapsulated DBTDL can decrease the E _a, A, and the reaction rate constant of CE resins due to the gradual release of DBTDL from MCs and the homogeneous dispersion of the released DBTDL in CE resins. The E _a, A, and the reaction rate constant of CE/MC systems are effectively adjusted by the MC content and heating process. The reaction orders for all CE/MC systems are close to 1. The reaction model of CE/MCs is considered as a two-dimensional nucleation (A ₂).     

Catalytic mechanisms of triphenyl bismuth,dibutyltin dilaurate,and their combination in polyurethane-forming reaction

The catalytic mechanisms of triphenyl bismuth (TPB), dibutyltin dilaurate (DBTDL) and their combination have been studied in a model polyurethane reaction system consisting of copolyether (tetrahydrofuran–ethyleneoxide) and N-100; NMR spectroscopy was used to detect the associations between reactants and catalysts. A relatively stable complex was shown to be formed between hydroxyl and isocyanate; the catalysts showed different effects on the isocyanate–hydroxyl complex, therefore resulting in different curing characteristics. The formation of hydrogen bonding between the complexed hydroxyl and other hydroxyl or the resulting urethane provided an “auto-catalysis” to urethane formation. DBTDL destroyed the isocyanate–hydroxyl complex before catalyzing the reaction through the formation of a ternary complex, whereas TPB was able to activate the isocyanate–hydroxyl complex directly to form urethane. The reaction catalyzed by the combination of TPB and DBTDL gained advantages from the multiple catalytic entities, i.e., TPB, DBTDL, and a TPB–DBTDL complex. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:1217–1225, 1997     

Effects of dibutyltin dilaurate and epoxidized soya bean oil on the thermal stability of chlorinated natural rubber from latex

The effects of dibutyltin dilaurate (DBTL) and epoxidized soya bean oil (EBO) on the dehydrochlorination reaction of chlorinated natural rubber (CNR) from latex were studied by the measurement of the HCl evolving rate during the thermal degradation of CNR and by the determination of the amounts of cyclic conjugated dienes that formed on the CNR molecular chains. During the early stage of the thermal degradation of CNR at 150°C, HCl was eliminated, and the cyclic conjugated dienes formed on the CNR molecular chains. Under the effects of DBTL and EBO, the HCl evolving rates during the early stage of the thermal degradation of CNR were reduced, whereas the amounts of cyclic conjugated dienes formed on the CNR molecular chains were increased. Under the effects of mixtures from the compounding of DBTL with barium stearate or 2,2′‐methylene‐bis(4‐methyl‐6‐tert‐butyl‐phenol) as well as the compounding of EBO with 2,2′‐methylene‐bis(4‐methyl‐6‐tert‐butyl‐phenol), not only the HCl evolving rate from CNR but also the formation of cyclic conjugated dienes decreased, and this indicated that the compounded mixtures had synergistic functions against the thermal degradation of CNR. However, the mixture from the compounding of EBO with barium stearate had no synergistic effect on increasing the thermal stability of CNR. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1986–1991, 2006     

聚乙二醇月桂酸酯的合成研究

采用正交实验对聚乙二醇(PEG400)酯化月桂酸的工艺条件进行了研究,探讨了醇酸摩尔比、反应温度、催化剂用量和反应时间对产品皂化值的影响。结果表明,在醇酸摩尔比为1.05、反应温度为130℃~150℃、催化剂用量为0.3%~0.8%、反应时间为3 h~5 h的条件下,产品的皂化值指标在90 mgKOH/g~97 mgKOH/g,达到控制要求。     

A study of new manganese complexes as potential driers for alkyd paints

In the search for new autoxidation catalysts, the oxidative crosslinking of ethyl linoleate (EL) has been monitored using time-resolved FT-IR (Fourier transform IR spectroscopy), size-exclusion chromatography and GC/MS (gas chromotography/mass spectroscopy). These methods seem to be quite sensitive to changes in the structure of the catalyst. It has been found that the compound [Mn(acac)₃] (Hacac = 2,4-pentanedione) is an efficient catalyst for the oxidation and the oligomerization of EL, which is proposed to proceed not only via hydroperoxide decomposition, but also through substrate activation. The system [Mn(acac)₃] with added bpy (=2,2′-bipyridine) has a very high activity for the oxidation of EL. In situ formation of the species [Mn^II(acac)₂(bpy)] and [Mn^III(acac)₂(bpy)]⁺, and the high reactivities of these two species with hydroperoxides and with EL, respectively, are proposed as an explanation for the observed high oxidation rate. Presented at XXVIIIth FATIPEC Congress, organized jointly by the Hungarian Chemical Society (MKE) and the Polish Association of Chemical Engineers (SITPCHEM), in Budapest, Hungary, June 12–14, 2006.     

二丁基氧化锡在糖衍生物选择性合成中的应用

二丁基氧化锡和糖上的羟基选择性地形成亚甲锡烷基缩醛,通过聚合作用使处于聚合体不同位置的羟基显示了不同的电负性和亲核性,进行选择性反应合成糖衍生物.因此,利用二丁基氧化锡这种反应特性,分别对其在活性糖的保护、形成糖聚合体和糖基化等方面的应用进行了阐述,为该试剂在糖衍生物合成中的广泛应用提供参考.     

Review of autoxidation and driers

This article is an overview of the chemistry and driers used in autoxidatively cured coatings and in particular alkyds. The drying process for alkyds and other unsaturated fatty acid materials is based on a series of chemical reactions known as autoxidation. The autoxidative process is usually catalyzed by metal salts known as driers. Numerous of investigations have elucidated the catalytic activity and reaction mechanism of the drying process. Spectroscopic techniques, especially mass spectrometry, have been used to study the autoxidation process and its products. Recent investigations on the oxidative drying of alkyd coating films are presented with a focus on both metal based and more environmental friendly means of catalysis.     

A study on the synthesis and electrical properties of chelate polymers

Cu(II), Ni(II), and Co(II) chelate polymers of 4,4′-dihydroxy-3,3′-diacetyl biphenyl bisthiosemicarbazone (L-1), and 4,4′-dihydroxy 3,3′-dipropionyl biphenyl bis-thiosemicarbazone (L-2), have been prepared. The electrical resistivity and magnetic moment have been measured. The Hall effect and Seebeck effect studies of CuL-1 have shown it to be a p-type semiconductor, and the mechanism of transport is hopping type.