氯磺化聚乙烯橡胶的无铅硫化

简要介绍氯磺化聚乙烯橡胶(CSM)的无铅硫化.CSM无铅硫化体系主要有季戊四醇、双马来酰亚胺、氢化松香、环氧树脂和过氧化物硫化体系等,其中季戊四醇、双马来酰亚胺和环氧树脂硫化体系胶料的综合性能较好,具有实用性.耐水性能差是无铅硫化CSM存在的主要问题,今后应探索多种无铅硫化剂并用的复合无铅硫化体系并开展耐水性吸酸剂的研究.     

过氧化物硫化氯磺化聚乙烯的试验研究

研究过氧化物硫人经氯磺化聚乙烯胶料的硫化特性，探讨共硫化剂、防老剂等对胶料在充化特性的影响。试验表明，ＣＳＭ胶料采用有机过氧化物硫化时的抗焦烧性及耐热老化性比采用金属氧化物、硫黄及季戊四醇硫化要好；共硫化剂采用ＨＶＡ－２、ＴＡＩＣ；在有炭黑填充的配方中用防老剂ＮＢＣ，在非炭黑填充的配方中用防老剂ＤＤＡ／４０２０时胶料综合性能较好。     

硫化体系对氯磺化聚乙烯橡胶性能的影响

文中研究了硫化体系对氯磺化聚乙烯橡胶性能的影响．其中着重分析了这种橡胶的耐天候老化性能。     

氯磺化聚乙烯橡胶生产与应用

氯磺化聚乙烯(筒称CSM)是低密度聚乙烯或高密度聚乙烯经过氯化和氯磺化反应制得的一种特种橡胶。分子量一般在20000-30000之间，CSM具有独特的综合性能，具有良好的着色性、耐油、耐热、抗氧化性、耐候性、耐腐蚀性、阻燃性、耐磨性和韧性。因而用途广泛。     

环氧树脂硫化体系对氯磺化聚乙烯橡胶性能的影响

研究环氧树脂硫化体系对氯磺化聚乙烯橡胶（CSM）性能的影响。结果表明,硫化体系的种类对CSM性能影响较大,金属氧化物硫化胶的硬度和拉伸强度高,环氧树脂和过氧化物硫化胶的拉断伸长率高、压缩永久变形小。环氧树脂硫化体系的促进剂和活性剂对CSM性能的影响不是非常明显。环氧树脂硫化体系中对拉伸强度影响最大的因素是硫化剂环氧树脂,对拉断伸长率影响最大的因素是促进剂TRA。     

增塑剂在氯磺化聚乙烯橡胶中的应用

研究增塑剂DOP、DOS和氯化石蜡对氯磺化聚乙烯橡胶(CSM)性能的影响。结果表明:加入不同品种增塑剂或随着增塑剂用量的增大,CSM胶料的门尼粘度下降,t10和t90延长,交联程度降低,硫化胶的拉断伸长率增大,其他物理性能和耐热空气老化性能均下降,氧指数呈减小趋势,耐低温性能提高;增塑剂DOS对CSM硫化胶耐低温性能的改善效果最大,增塑剂DOP次之,氯化石蜡最小;增塑剂DOS用量为40份的CSM硫化胶达到了耐严寒的要求。     

增塑剂在氯磺化聚乙烯橡胶中的应用

研究增塑剂DOP、DOS和氯化石蜡对氯磺化聚乙烯橡胶（CSM）性能的影响。结果表明：加入不同品种增塑剂或随着增塑剂用量的增大,CSM胶料的门尼粘度下降,t₁₀和t_{90延长,交联程度降低,硫化胶的拉断伸长率增大,其他物理性能和耐热空气老化性能均下降,氧指数呈减小趋势,耐低温性能提高;增塑剂DOS对CSM硫化胶耐低温性能的改善效果最大,增塑剂DOP次之,氯化石蜡最小;增塑剂DOS用量为40份的CSM硫化胶达到了耐严寒的要求。}     

新工艺合成促进剂CZ的鉴定试验

主要对我所采用新工艺合成的促进剂ＣＺ在常用胶种，如天然橡胶（ＮＲ）、丁腈橡胶（ＮＢＲ）及丁苯橡胶（ＳＢＲ）中的配合性能及物理性能进行了试验，并同兰化公司助剂厂传统方法合成的促进剂ＣＺ进行了全面比较。试验结果表明，采用新工艺合成的促进剂ＣＺ，性能稳定，效果良好，具有与老产品同样的促进效果。     

The Effect of Accelerator/Sulphur Ratio on the Cure Time and Torque Maximum of Epoxidized Natural Rubber

Abstract

The cure time of accelerated sulphur vulcanization of Epoxidized Natural Rubber (ENR 25) was studied while one grade of unmodified natural rubber– Standard Malaysian Rubber Light (SMR L) was used as a control. Five accelerators, viz. 2-mercaptoben-zothiazole (MBT), tetramethylthiuram disulphide (TMTD), zinc dimethyldithiocarbamate (ZDMC), N-tert-butyl-2-benzothiazylsulphenamide (TBBS) and diphenylguanidine (DPG) were used in the study and the vulcanization systems used were conventional vulcanization (CV), semi-efficient vulcanization (semi-EV) and efficient vulcanization (EV). Monsanto Moving-Die Rheometer (MDR 2000) was used to determined the cure time in the temperature range of 100-180°C. The results indicate that cure time decreases exponentially with increasing temperature for the two rubbers studied. At a fixed curing temperature, ENR 25 shows shorter cure time compared to that of SMR L. This has been attributed to the activation of the double bond by the adjacent epoxide group in ENR 25. Studies of the effect of varying amounts of M Bata a fixed sulphur concentration show that cure time decreases as the accelerator concentration increases. ENR 25 shows higher torque maximum than SMR L. This observation can be related to the oxirane group which is bulky and thus accounts for increased glass; transition temperature with increase in the level of epoxidation. Of the vulcanization systems, CV shows the highest torque maximum followed by semi-EV and than EV. This trend can be attributed to the amount of active sulphurating agent which increases with increasing accelerator concentration. It was also found that the influence of accelerator/sulphur ratio becomes less significant as vulcanization temperature increases.     

Hydrogen Peroxide as a Resin Cure Accelerator

The reaction of hydrogen peroxide with conventional resin adhesives was sufficiently exothermic for the heat to accelerate and improve resin cure in the hotpress. As a consequence, pressing times for medium density fibreboard, particleboard, and plywood could be reduced by up to 30% and, in some cases, better resin cure permitted a reduction in binder level. Differences in the interaction of hydrogen peroxide with various adhesives were observed and a catalyst was found to enhance the exothermic effect.

The behaviour of hydrogen peroxide in combination with a tannin-based binder and wood fibre was studied over a wide temperature range. Below 60°C the system was stable. At 70°C the initial reaction was endothermic followed by a slow exothermic reaction. At hotpressing temperatures the exothermic reaction was rapid but controllable. It was concluded that the hydrogen peroxide-tannin-fibre system does not impose an additional safety hazard on medium density fibreboard plant operation.     

新型酚醛树脂固化反应动力学及固化机理研究

采用DSC热分析对S酚醛树脂的固化过程进行了动力学研究,得出了该树脂的固化工艺温度及固化动力学参数,其凝胶化温度、固化温度和后处理温度分别为360.7K、421.6K和463.4K;反应级数n=0.912、表观活化能E=76.14kJ·mol^-1,反应频率因子A=4.704×10^8min^-1。采用红外光谱分析初步探讨了该树脂的固化机理,结果表明其固化反应主要是苄羟基与苯环邻位上活泼氢产生交联缩合反应,少量为苄羟基之间的缩合反应。     

新型硫化促进剂TBSI在丁腈橡胶中的应用研究

研究了TBSI在丁腈橡胶中的硫化促进性能，并与NS，CZ，TMTD和DM促进剂进行了对比。结果表明，TBSI作NBR硫化促进剂时，焦烧时间长，硫化胶强度高，但硫化速度较慢。当TBSI与TMTD，DM或M组成活化的次磺酰胺并用体系时，不但保证了焦烧安全性，缩短了正硫化时间，而且还进一步提高了硫化胶的300％定伸应力。经4h过硫化反应后，TBSI／TMTD体系的300％定伸应力保持约80％，而NS不足60％。     

固化促进剂在耐候粉末涂料用聚酯树脂中的应用研究

研究了耐候粉末涂料用聚酯树脂合成中固化促进剂的作用;讨论了固化促进剂的选择、加入量、加入时机对树脂性能及涂层固化性能的影响;分析了固化促进剂对不同配方聚酯合成的影响。     

氯磺化聚乙烯的合成与应用

介绍了聚乙烯、氯化聚乙烯及氯磺化聚乙烯的生产技术、加工应用进展及发展前景。     

橡胶硫化促进剂DZ合成新工艺

采用促进剂DM和二环己胺为原料,以氨气为缚酸剂,用甲醇做溶剂合成橡胶硫化促进剂DZ。并通过实验得到优化工艺条件:n(DM)∶n(二环己胺)∶n(氯代二环己胺)=1∶1.2∶1.2,反应温度为60~65℃和反应时间为5~10min,在此工艺条件下循环套用后合成橡胶硫化促进剂DZ的总收率可接近100%。     

促进剂DZ/CZ并用体系硫化特性的研究

从并用比和用量两个角度考察促进剂ＤＺ／ＣＺ并用体系的硫化特性，以探讨替代促进剂ＮＯＢＳ的可能性。研究表明，促进剂ＤＺ，ＣＺ并用仅起互补作用。因为促进剂ＣＺ在交联密度和效率上均强于促进剂ＤＺ，所以并用体系的特性转变前移至１：０．５左右的并用比处。促进剂ＤＺ／ＣＺ固定并用比在硫化特性曲线上与促进剂ＮＯＢＳ只有一个相交点，只有变并用比体系才能在整个用量范围内与促进剂ＮＯＢＳ相近。提出了促进剂ＤＺ／ＣＺ变     

硫化促进剂CBS合成新工艺

研究了一种用未经精制的粗Ｍ与环己胺反应硫化促进剂ＣＢＳ的新工艺。新工艺具有原料消耗低，经济效益好的特点，同时还避免了因精制原料，Ｍ而带来的大量废水，对该工艺最佳条件进行了讨论。