硫化促进剂DM的合成

<正> 1 前言 DM(二硫化二苯并噻唑)是一种性能优良的噻唑类橡胶硫化促进剂。与其他秋兰姆类、胍类、二硫带氨基甲酸盐类、次磺酰胺类等促进剂相比,噻唑类硫化促进剂具有快速硫化,硫化曲线平坦,物理性能好,操作安全可靠的特点。在噻唑类促进剂中,DM因有两个促进基和一个防焦基团,具有焦烧时间长、毒性小的优点,是目前国内外应用最为广泛的硫化促进剂之一。其合成方法主要是以促进剂M为原     

加工促进剂的作用和效果

本文叙述加工促进剂在橡胶工业中的广泛应用。同时还举例说明塑炼／混炼工艺对加工促进剂的基本需求,例如,加工促进剂降低胶料粘度,从而减少混炼能量或时间。另外,加工促进剂保证填充剂具有良好的分散性／混合性,赋予胶料良好的粘弹性质。加工促进剂将得到更进一步的广泛应用。正如我们所知道的那样,加工促进与润滑／均匀剂一样,以改善挤出和注压性能为目的。     

复配留香型洗衣液的研制

随着各种形式的洗衣机进入家庭,人们对日用洗涤用品的要求也愈来愈高,不仅要求去污力强,还要求洗后留有香味且使用方便,为此我们开展了复配留香型洗衣液的研制。     

橡胶粘合促进剂的研制与开发

本文评述了钴盐橡胶合促进剂的研究进展，比较了各种粘合促进剂对橡胶－钢丝帘线的粘合性能，成功地研制开发了一种新型橡胶粘合促进剂，其主要性能指标与国际上著名的橡胶粘合促进Ｍａｎｏｂｏｎｄ６８０Ｃ基本一致，是一咱高附加值精细化工产品。     

复配混凝剂预处理促进剂CBS生产废水工艺的研究

研究复配混凝剂预处理促进剂CBS生产废水工艺。结果表明：在复配混凝剂用量为3.0 kg·t-1,混凝反应pH值为7.5,温度为55 ℃条件下预处理,促进剂CBS生产废水CODcr去除率达72%以上,多效蒸发蒸汽用量降低,蒸发效率提高,多效蒸发出的盐满足工业用盐要求,蒸馏中水经生化处理后水质满足回用要求,节约了清水用量。     

GC-MS法鉴定硫化橡胶促进剂的研究

本实验采用气相色谱-质谱联用仪来分析硫化橡胶的丙酮抽提液,从而确定橡胶制品中所用的促进剂类型。实验结果表明,虽然部分促进剂在橡胶硫化过程中发生了分解及重组反应,但是通过其单体及反应产物的特征离子基本可以定性硫化胶中所使用的促进剂类型,其中噻唑类和次磺酰胺类促进剂由于都含有苯并噻唑碎片,故当有次黄酰胺类的促进剂存在时,不能确定该配方中是否含有促进剂M。     

The behavior of dithiocarbimate derivative as safety accelerator of natural rubber compounds

A conventional vulcanization system containing tetrabutylammonium bis(4‐methylphenyldithiocarbimato)zincate(II) (ZNIBU) was used for curing of natural rubber (NR) compounds. Rheometric (t_s1, t₉₀, and CRI) and mechanical properties, such as tensile and tear strengths and modulus at 300%, were measured to evaluate the acceleration potential of ZNIBU. Commercial accelerators (TMTD, MBTS, and CBS) and a binary system CBS/ZNIBU were also tested for comparison purposes. It was observed that ZNIBU alone does not give either safe scorch time or cure rates appropriate for industrial applications. Nevertheless, mechanical properties are comparable to those given by the other accelerators used. As for the binary system, positive synergistic effects can be found in tear strength and modulus of NR vulcanizates. Besides, ZNIBU does not contribute for the formation of nitrosamines in the vulcanization process. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

用附着型促进剂制备橡胶/蒙脱土纳米复合材料

用附着型促进剂PBS在机械混炼插层法的基础上制备了天然橡胶/蒙脱土纳米复合材料。由于硫化后大部分促进剂基团都连在橡胶分子链上,因此用分子一端能和蒙脱土片层有相互作用的附着型硫化促进剂,可以大大增强蒙脱土和橡胶基体的相互作用,得到性能优良纳米复合材料。用PBS制备纳米复合材料其硫化体系活性能低,硫化胶交联密度增大,有机蒙脱土片层在橡胶基体中达到纳米级的分散,具有优良的力学性能,加入8%有机蒙脱土100%模量从1.2 MPa增至2.2 MPa,500%模量从8.12 MPa增至18.23 MPa,邵氏GA硬度从45增至55,而加入2%有机蒙脱土500%模量从8.12 MPa增至17.06 MPa,撕裂强度从36.31 kN/m增至43.65kN/m,加入2~10份有机蒙脱土时其效果相当于加入40份半补强炭黑。     

混合氧化法合成硫化促进剂CBS的新工艺研究

对以2-巯基苯并噻唑(促进剂M)和环己胺为初始原料,经双氧水和次氯酸钠"混合"氧化合成硫化促进剂N-环己基-2-苯并噻唑次磺酰胺(简称CBS)进行了研究.采用混合氧化法,即反应前期采用双氧水氧化,后期采用次氯酸钠氧化的工艺,不仅克服了双氧水氧化法产率低的缺点,同时有效的降低了产生废水的含盐量.考察了工艺条件对产品的影响,优化得到适宜的工艺条件,使产品的平均产率达95.0%(以M计),纯度为99.0%,产品为优级品.混合氧化法产生废水含盐量较次氯酸钠法减少67%.     

防晒化妆品包装发展趋势

介绍了几种防晒化妆品的包装及包装新材质。论述了目前防晒品包装的特点、包装潮流、包装分配体系的创新、包装材质的改进、变化多样的产品的外形及发展趋势。指出消费者对防晒产品使用的便捷性需求将是未来防晒化妆品包装的一个发展方向。     

绿色环保橡胶促进剂的配方研究

笔者研究了硫化促进荆M(2-巯基苯并噻唑)、促进剂CZ(N-环己基-2-苯并噻唑次磺酰胺)在橡胶制品中的应用，从经济环保的角度进行了新的配方设计，并进行了性能(邵尔A型硬度、抗拉强度、扯断伸长率和老化系数)测试。结果表明：同等条件下，生产相同的产品胶板，使用促进剂CZ的制品综合性能要优于使用促进剂M的制品，且用量少。     

浅议橡胶促进剂TBBS的开发

介绍了橡胶硫化促进剂ＴＢＢＳ 及其原料叔丁胺国内外状况及工艺路线。促进剂ＴＢＢＳ不会产生毒性物质亚硝胺。因此, 它将是一个很有发展前途的产品。     

橡胶促进剂NOBS废水处理工程实践

采用蒸发-催化氧化预处理橡胶促进剂NOBS废水,在进水COD≤20000mg/L情况下,预处理后COD约为1000mg/L.达到了预期处理效果。     

挤出用溴化丁基橡胶硫化体系的研究

溴化丁基橡胶几种典型硫化体系的对比实验,结果表明,用氧化锌体系硫化的溴化丁基橡胶具有良好的焦烧安全性,比较适宜于挤出用;加入促进剂HVA-2,可显著提高胶料的硫化速度和交联程度,并改善焦烧安全性;当氧化锌用量为4份,HVA-2用量为1.5份时,胶料具有较佳的综合物理性能和加工安全性。     

Physical,mechanical, and viscoelastic properties of natural rubber vulcanizates cured with new binary accelerator system

Natural rubber was vulcanized with a new binary accelerator system based on 1‐phenyl‐2,4‐dithiobiuret (DTB) and dicyclohexyl benzothiazyl sulfenamide. A significant reduction in cure time was observed with the addition of DTB. The cure kinetics was investigated and the activation energy was determined. The mechanical properties were improved by adding DTB, and the maximum values are shown at an optimum concentration. Estimates of the concentration of crosslinks and of the relative proportions of different types of crosslinks were made by the chemical characterization of the vulcanizates. The crosslink densities obtained from swelling measurements and stress–strain measurements were compared with those obtained from modulus measurements. All of them follow a similar trend and support the observed mechanical properties. A dynamic mechanical analysis of the mixes was carried out and the activation energy was determined from Arrhenius plots. The glass‐transition temperature was found to increase with the increase in crosslink density and frequency of measurements. The stress–strain curves were found to not deviate from the strain crystallizing nature of natural rubber. The mechanical properties, network characterization, and processing characteristics were used to optimize the DTB concentration. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 2193–2203, 2003