航空密封腻子的再生

航空密封腻子储存一年后．已经变硬并且不能使用。试验发现：对其加入0．2份的TMTD并进行澳炼，腻子变得柔软并符合技术要求条件。除此之外，塑炼后的减于储存期仍为一年。     

Advances in layered double hydroxide (LDH)-based elastomer composites

This article reviews the advances in layered double hydroxide (LDH) materials and the synthesis of LDH-based elastomer composites. The potential of tuning the structure of LDH materials for desired properties and applications has attracted both academic and industrial interest in recent years. The modification of LDH materials and the use of such materials in the synthesis of composites with different elastomer matrices have been critically analyzed. Emphasis has been given to the use of Mg-Al LDHs and Zn-Al LDHs with different elastomers. The use of modified LDHs with elastomers substantially improves their mechanical, thermal and optical properties. Even “smart properties” of elastomers, such as reversible thermotropic optical characteristics, have been realized with the use of LDH-based multifunctional additives in rubber formulations. The flame retardance of some elastomer composites has also been enhanced with the use of modified LDHs. The possibility of replacing ZnO with LDH during rubber compounding has also been discussed, which would lead to drastic interventions in the well-established rubber processing technologies. LDH materials have also been reported to be biocompatible. Therefore, among the various possible applications of LDHs in different material development processes, their use in rubber technology offers the potential for environmentally friendly rubber products, even tires. Throughout this article, the structure, synthesis, properties and applications of elastomer/(LDH) composites are discussed, including suitable examples taken from the relevant literature.     

氧气一步氧化合成硫化促进剂TMTD

通过对目前国内外TMTD各种生产方法的比较,认为氧气一步氧化法较好。利用正交试验对氧气一步氧化法进行了研究,得到的最佳方案为反应温度40℃、压力0.5MPa、催化剂用量0.4mol/kmol二甲胺、原料配比二甲胺:二硫化碳=1:1.2(mol比)。     

硫化促进剂TMTD含量的测定

本文提出了TMTD含量的测定方法是将试样用氯仿溶解，然后采用分光光度法进行测定，该方法简便、快速、准确、省时，值得在实际生产中推广。     

发动机曲轴皮带轮减震圈配方设计优化

以天然橡胶为生胶,采用L9(34)正交试验法,研究了DCP、硫磺、TMTD变量对发动机曲轴皮带轮减震圈混炼胶性能的影响.结果表明,各因素对减震圈混炼胶的拉伸强度、断裂伸长率及其耐老化性能和压缩永久变形性能影响程度不同.TMTD对减震圈混炼胶的拉伸强度影响最大,而DCP对减震圈混炼胶热氧老化、压缩永久变形影响最为明显.经...     

降低TMTD装置二甲胺消耗的措施

分析了TMTD生产中原料二甲胺消耗偏高的原因,通过采取相应措施对装置进行工艺优化,使二甲胺消耗降低了38kg/t。     

燃气发生器衬层残渣研究

通过减少硫化剂ＴＭＴＤ,调整硫化时间,控制和防止后硫化,解决了燃气发生器的以丁腈橡胶为基的衬层残渣稳定性问题。经高温加速老化试验和燃气发生器试车验证,１００ｇ衬层中ＴＭＴＤ含量取０．４,０．５ｇ,硫化４ｈ,可确保燃气发生器正常工作。     

橡胶促进剂TMTD的合成研究

以二甲胺和二硫化碳为原料，以双氧水为氧化剂，制备了硫化促进剂TMTD（二硫化四甲基秋兰姆），讨论了反应温度、物料配比和反应时间对反应收率及产物纯度的影响，结果表明，较传统工艺相比，本工艺路 线显著提高反应收率，产品质量也有较大提高。     

硫磺硫化体系组成对EPDM／CM共混卷材力学性能的影响

通过调整硫化体系中硫磺（S）和硫化促进剂（TMTD）的用量，研究了EPDM／CM共混卷材的力学性能。结果表明，TMTD用量为1phr（每百克橡胶或树脂中的含量）时，S用量为1．5phr时EPDM／CM共混卷材的力学性能最佳；TMTD用量为1．5phr时，S用量为1．25phr时EPDM／CM共混卷材的力学性能最佳；后者综合性能优于前者。     

The limiting value of ZDMC formation: new insight into the reaction of ZNO and TMTD

The reaction of ZnO and tetramethylthiuram disulfide (TMTD) was reinvestigated in detail. Under conditions where evaporation of volatiles is possible, TMTD and an excess of ZnO are found to produce bis(dimethyldithiocarbamato)zinc(II) (ZDMC) in limiting amounts close to 60 mol %, irrespective of the ratio between ZnO and TMTD. This result points to the operation of more than one route toward ZDMC. When ZnO and TMTD are reacted in closed vessels in inert atmosphere, a nucleophilic reaction of ZnO with TMTD was confirmed by GC–mass spectroscopy (MS) detection of COS and NMR observation of tetramethylthiourea (TMTU). This route is found to account for about 70 mol % of the total amount of ZDMC formed. A previously unrecognized redox reaction between ZnO, sulfur, and TMTD, furnishing ZnSO₄ and ZDMC, is responsible for approximately 15 mol % of the amount of ZDMC. Other products that were detected are CO₂, CS₂, and tetramethylurea, whereas ZnSO₃, ZnS, and dioxygen were absent. Based on the latter observation, the operation of a mechanism constituting radical reduction of water by TMTD, yielding dioxygen, was excluded. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1247–1257, 1999