硫化工艺对卤化丁基橡胶瓶塞性能影响因素分析

讨论了硫化工艺对卤化丁基橡胶药用瓶塞性能的影响因素及其调整方法。     

硅氧烷硫化体系对药用卤化丁基橡胶塞性能的影响

硅氧烷硫化体系是药用卤化丁基橡胶塞的一种特殊硫化体系。本文研究了硅氧烷硫化体系对药用丁基橡胶塞性能的影响。试验结果表明,硅氧烷硫化体系是卤化丁基橡胶塞一种有效的无锌无硫的硫化体系,并且用其生产的药用卤化丁基橡胶塞在与一些活性较高的药品上应用时有较好的相容性,可以达到覆膜胶塞的水平。     

硅氧烷硫化体系对药用氯化丁基橡胶塞性能的影响

研究硅氧烷硫化体系对药用氯化丁基橡胶(CIIR)胶塞性能的影响。结果表明:随着硅氧烷用量的增大,CIIR胶料的硫化程度总体增大;当硅氧烷用量为2份时,CIIR胶塞提取液的澄清度最小;以硅氧烷硫化的CIIR胶塞与头孢菌素的相容性较好,可以达到覆膜CIIR胶塞和进口CIIR胶塞的水平。     

硫化体系对CR／CⅡR共混硫化胶性能的影响

研究了ZnO／S硫化体系、TCY／树脂复合硫化体系、Pb3O4／树脂复合硫化体系对CR／CⅡR共混胶硫化特性、物理机械性能、耐热老化性能、耐油性能的影响。结果表明：采用ZnO／S硫化体系，共混胶的硫化速度较快，转矩较高；采用3种硫化体系的共混胶力学性能相当，而采用TCY／树脂复合硫化体系硫化的共混胶老化后力学性能保持率比ZnO／S／有机促进剂硫化体系高；采用ZnO／S／有机促进剂硫化体系的共混硫化胶耐油性能稍好。     

硫化体系对热塑性硫化胶性能的影响

采用动态硫化法制备了丁基橡胶(IIR)/聚丙烯热塑性硫化胶(TPV),研究了不同硫化体系对TPV的硫化特性、热性能、动态力学性能和微观相态结构的影响。结果表明,由酚醛树脂硫化体系(PRV)、硫黄硫化体系(SV)和硫载体硫化体系(SCV)制备而得的TPV(依次相应为PRV-TPV、SV-TPV和SCV-TPV)中,PRV-TPV的动态硫化时间最长,SCV-TPV的转矩最小,流变性能最好;PRV-TPV的交联密度最大,SCV-TPV的交联密度最小;PRV-TPV的储能模量最大,Payne效应最弱。TPV的拉伸强度由大到小依次是PRV-TPV、SV-TPV、SCV-TPV,老化后强度的变化规律与老化前相同;PRV-TPV的耐热性能最佳。SV-TPV和SCV-TPV有2个损耗因子(tan δ)峰,PRV-TPV有1个tan δ峰,且玻璃化转变温度较高;PRV-TPV和SV-TPV的熔融温度(T_m)相差不大,而SCV-TPV的T_m较高;SV-TPV和SCV-TPV的结晶温度(T_c)相差不大,PRV-TPV的T_c较高。PRV-TPV和SV-TPV的相态结构为明显的海岛相态结构,PRV-TPV中的IIR交联颗粒粒径较小; SCV-TPV呈不明显的海岛相态结构,且IIR交联颗粒以拉伸的长条状为主。     

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。     

动态硫化工艺对丁基橡胶/聚丙烯热塑性硫化胶性能的影响

考察了3种不同动态硫化工艺(M 1、M 2和M 3)对丁基橡胶(IIR)/聚丙烯(PP)热塑性硫化胶(TPV)结构与性能的影响,并考察了转子转速和动态硫化时间对IIR/PP TPV物理机械性能的影响。结果表明,不同动态硫化工艺制备的TPV的Payne效应均随着应变的增大而减小,采用M 3工艺制备的TPV的网络结构最强。采用3种工艺制备的TPV的拉伸强度由大到小依次为:M 3、M 2、M 1。采用M 2和M 3工艺制备的TPV中IIR与PP相容性较好。不同动态硫化工艺制备的TPV中IIR均呈不规则长条状分散在PP中,采用M 1工艺制备的TPV中交联IIR颗粒的尺寸最大,采用M 3工艺制备的TPV中交联IIR相颗粒和滑石粉填料分散较均匀。随着动态硫化过程中转子转速的提高及动态硫化时间的延长,采用M 3工艺制备的TPV的拉伸强度和扯断伸长率均先增加后减小。当转子转速为80 r/min、动态硫化时间为5 min时,IIR/PP TPV的物理机械性能较好。     

硫化体系对CR/CIIR共混硫化胶性能的影响

研究了ZnO/S硫化体系、TCY/树脂复合硫化体系、Pb3O4/树脂复合硫化体系对CR/CIIR共混胶硫化特性、物理机械性能、耐热老化性能、耐油性能的影响。结果表明:采用ZnO/S硫化体系,共混胶的硫化速度较快,转矩较高;采用3种硫化体系的共混胶力学性能相当,而采用TCY/树脂复合硫化体系硫化的共混胶老化后力学性能保持率比ZnO/S/有机促进剂硫化体系高;采用ZnO/S/有机促进剂硫化体系的共混硫化胶耐油性能稍好。     

医用丁基橡胶瓶塞生产技术现状和发展趋势

丁基橡胶瓶塞是药品内包装的更新换代产品，它以优异的化学稳定性、气密性、低萃取性和良好的生物性能，为药物质量提供了更可靠的保证。     

硫化体系对天然橡胶性能的影响

研究普通硫化体系和半有效硫化体系对天然橡胶(NR)各项性能的影响。结果表明:与普通硫化体系NR胶料相比,半有效硫化体系NR胶料的硫化返原程度小,物理性能、压缩疲劳性能、耐磨性能和耐热老化性能好,且随着促进剂用量的增大性能更优,但耐切割性能变差;随着硫化时间的延长,普通硫化体系和半有效硫化体系NR胶料的压缩疲劳温升和磨耗量均增大,且普通硫化体系胶料增幅更大。     

甲基乙烯基硅橡胶/丁基橡胶硫化性能和耐热性能研究

通过共混法制备了甲基乙烯基硅橡胶/丁基橡胶复合材料,用DSC研究了复合材料硫化前的结晶性能与硫化性能,用TG研究了复合材料硫化后的热分解性能。根据在不同升温速率下的DSC曲线,用Kissinger方程对复合体系的硫化性能进行动力学研究,得到了交联反应活化能为95.1 kJ/mol、反应级数n为0.78。TG测试表明,复合材料的耐热性介于二者之间。力学测试表明,该材料的综合物理力学性能较好,可以作为阻尼材料使用。     

Effect of the vulcanizing system on the mechanical properties of butyl rubber/ethylene propylene diene monomer–carbon black blends

The effect of the vulcanizing system on the mechanical properties of butyl rubber/ethylene propylene diene monomer–general purpose furnace black–(GPF) blends was studied with static and dynamic mechanical measurements for these blends. The classical theory of elasticity was applied to show the mechanical behavior of the rubber–polymer blend and to calculate the degree of crosslinking. From the dynamic mechanical measurements, the elastic modulus, internal friction, and thermal diffusivity were calculated. The observed variations were explained in view of the role played by both the vulcanizing system and the reinforcing carbon black. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1539–1544, 2003     

The effects of compatibility on the mechanical properties and fatigue resistance of butyl/EPDM rubber blends

In this study, compatibility of butyl/ethylene‐propylene‐diene rubbers in different ratios was investigated byviscometric technique. For evaluating polymer compatibility, the parameters Δb suggested by Krigbaum&Wall, ΔB and μ that were suggested by Chee were calculated. Data obtained from viscometric study were used for preparing new compound recipe. Mechanical and rheological properties of the new compounds were measured and the changes in the properties before and after thermal aging were determined. Replacement of ethylene‐propylene‐diene rubber with butyl rubber in appropriate ratio improved the fatigue resistance of the vulcanizates. Improvement of dynamic mechanical properties of polymer blends is expected only in the case of blending compatible polymers in appropriate ratios. The compatibility of blends in different ratios has been studied by viscometric technique and mechanical measurements and obtained very similar results. It has been concluded that viscometric determination of butyl/ethylene‐propylene‐diene rubbers compatibility could be used as a simple technique for predicting the mechanical properties of the same rubber blend that was related with solid phase compatibility. POLYM. COMPOS., 31:1869–1873, 2010. © 2010 Society of Plastics Engineers.     

热灌装瓶级PET切片加工性能的影响因素

对辽化聚酯厂生产的PET瓶片进行分析测试,从瓶片的分子结构参数与瓶片使用性能及加工性能之间的关系进行了分析,找到影响大容量热灌装瓶级PET切片产品品质的主要工艺控制因素,并对工艺进行了优化。     

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。     

Effect of vulcanizing system on the crosslink density of nitrile rubber compounds

The synergistic activity of binary accelerator systems in rubber vulcanization is well known. Binary accelerator systems are being widely used in industry and are becoming increasingly popular because of the fact that such mixed systems can produce a vulcanizate with superior mechanical properties compared to those of stock cured with a single accelerator. The authors have studied the performance of a binary accelerator system based on cyclohexyl benzothiazole sulfenamide (CBS), tetramethyl thiuram disulphide (TMTD) in the sulfur vulcanization of nitrile rubber. The amount of sulfur and accelerator was varied to change the network crosslink density of vulcanizates. The observed mutual activity has been discussed based on the mechanical properties and crosslink density. The physical crosslink density of the various nitrile rubber mixes was estimated using the Kinetic Theory of Elasticity. The mechanical properties of the various rubber compounds were related to the corresponding crosslink density estimated for each compound. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 2440–2445, 2005     

Toluene and butyl acetate removal from air by plasma-catalytic system

The decomposition of toluene and butyl acetate was investigated in a plasma-assisted catalytic system. The wire-cylinder plasma reactor using pulse for power source and Pt/Al₂O₃ catalyst was studied. It was found that plasma treatment significantly increases the removal effect of catalysts. The induced plasma increased the removal efficiency nearly by about 28% in 245 °C and nearly by 36% in 210 °C for butyl-acetate. These effects of the combined treatment are higher than the sum of individual steps. It means that this synergy is partly due to the catalytic oxidation with ozone and other active particles that are produced in the discharge.     

基于RS-485总线的硫化机群控系统设计

为适应硫化机自动化的需要，设计了一种利用RS-485总线把上位机和多台温度、压力控制器互联构成的集散系统。具体介绍了其系统的构成、网络通信的实现以及数据的采集。