纳米高岭土在氯化聚乙烯橡胶中的应用

研究了纳米高岭土对氯化聚乙烯橡胶（CM140B）的填充补强作用。结果表明：随着纳米高岭土用量的增加,CM140B硫化胶的焦烧时问、正硫化时间均逐渐延长。添加少量的纳米高岭土时,CM140B硫化胶的拉伸强度、拉断仲长率、撕裂强度、门尼粘度、硬度均减小。增加纳米高岭土用量,CM140B硫化胶的拉伸强度、拉断伸长率、定伸应力、撕裂强度、门尼粘度、硬度均逐渐增加。纳米高岭土对CM140B的补强效果与半补强炭黑和白炭黑相当,但其正硫化时间较自炭黑的短,且门尼粘度远远低于白炭黑的数值。与非纳米高岭士相比,使用纳米高岭土填充的CM140B综合性能优异。     

CM/CR共混胶性能的研究

研究了CM/CR共混胶的硫化特性、力学性能和动态力学性能,并测试分析了其交联密度和断面微观结构。结果表明,随着CM用量的增大,共混胶硫化程度降低,硫化时间延长,交联密度减小;力学性能先增加后减小,CM用量达到30份时其值达到最优;随着CM用量的增大,共混胶弹性模量和粘性模量均增大,损耗因子减小,CR粘辊性能得到明显改善。CM用量为30份时,共混胶具有明显的"海-岛"结构,CM岛相粒子数量较多,粒径尺寸约为0.5μm,且分散均匀。     

动态预硫化工艺对CR/CM共硫化性能的影响

研究了动态预硫化工艺温度对氯丁橡胶(CR)和氯化聚乙烯橡胶(CM)共硫化特性、物理性能和交联密度的影响。结果表明,随着动态预硫化温度的升高,共混胶的正硫化时间(tc90)先减少后增加,焦烧时间(tc10)、拉伸强度和交联密度先增大后减小,拉断伸长率逐渐减小。共混胶中CR相对应的玻璃化温度向高温方向移动,对应共混胶中的交联键分布向CM相偏移。动态预硫化工艺可明显改善CR/CM共混胶的共硫化性能和物理性能,且预硫化温度在110~120℃时,共硫化性能最佳。     

氯化聚乙烯与氯磺化聚乙烯的结构与性能及共混硫化体系

主要研究了氯化聚乙烯(CM)与氯磺化聚乙烯(CSM)的结构与性能及共混硫化体系。结果表明:随着氯含量的增加,CM的玻璃化温度逐渐升高。同样氯含量的CM的玻璃化温度高于CSM,且残余结晶度高于CSM。在CSM中并用适量的CM,可以提高CSM的加工安全性,并提高硫化效率;共混胶的拉伸强度和100%定伸应力随着CM用量增加逐渐增加,拉断伸长率和撕裂强度逐渐减小;随着CM用量的增加,共混胶的耐老化及耐油性能下降;噻二唑硫化体系硫化的共混胶硫化时间短,并且硫化胶的综合性能较好。     

橡胶型氯化聚乙烯与氯丁胶共混物的性能研究

研究了橡胶型氯化聚乙烯(CM)与氯丁橡胶(CR)共混物的性能。通过改变硫化体系、CR／CM并用比、填料的品种及用量，考察这些因素对CR／CM硫化胶性能的影响。实验结果表明：与噻二唑类硫化体系相比，硫脲类硫化体系硫化的橡胶具有较大的拉伸强度、撕裂强度和断裂伸长率。在CR／CM并用体系中，随着CM用量的增加，硫化胶的拉伸强度、撕裂强度下降。在HAF、SRF、SiO2、CaCO3种填料中，HAF、SiO2对CR／CM的补强效果最好，最佳用量为20～30份。     

聚醚型聚氨酯橡胶／氯丁橡胶共混物性能的研究

研究了聚醚型聚氨酯橡胶/氯丁橡胶共混物复合交联体系及其对共混硫化胶物理机械性能的影响;探讨了聚氨酯橡胶/氯丁橡胶共混胶料的硫化特性,共混硫化胶的力学性能、耐热老化性能和动态力学性能.结果表明:硫黄/MgO体系能够很好地硫化PUR/CR共混胶;当共混胶中PUR用量在0～100份范围内,共混胶的焦烧时间和正硫化时间均先减小后增加,最小转距和最大转距都降低;拉伸强度、撕裂强度和硬度均随PUR用量的增加而增加.拉断伸长率在PUR用量为40份时最大;共混硫化胶的耐热老化性能随着PUR用量的增加而增加,其拉仲强度保持率和拉断伸长率保持率呈上升趋势;动态力学研究表明,PUR和CR有很好的相容性,玻璃化温度随着PUR用量的增加而降低.     

CR用量对NR/SBR/CR共混胶力学性能及水性胶浆附着力的影响

研究了极性胶CR的加入对NR/SBR共混胶硫化特性以及力学性能的影响,同时研究了CR的加入对胶浆黏合情况的影响。结果表明,随着共混胶中CR用量的增大,共混胶的硫化程度明显增大,硫化速度变快;共混胶扯断强度先增大后降低,扯断伸长率减小,100%定伸强度增大,硬度增大;加入成浆体系会使共混胶力学性能明显下降;胶浆黏合情况方面,随共混胶中CR用量的增大,剥离强度先增大后降低,随附胶量的增加,剥离强度逐渐下降。     

MPU硫化胶及PAM/CM和MPU/PAM/CM共混胶性能研究

采用高温密炼机和开炼机制备MPU、PAM/CM共混胶及MPU/PAM/CM共混胶,研究了各组共混胶硫化特性、耐油老化前后物理机械性能.研究发现,拉伸时,小变形下MPU/PAM/CM和PAM/CM出现不同程度的屈服,大变形下MPU/PAM/CM的拉伸行为趋向于MPU硫化胶,表现出一定程度的韧性;MPU/PAM/CM的物理...     

丁腈橡胶/乙丙橡胶并用胶性能的研究

研究丁腈橡胶(NBR)/三元乙丙橡胶(EPDM)并用比对力学性能、老化性能和耐油性能的影响以及增容剂对共混胶性能的影响.结果表明,在NBR/EPDM共混胶中随EPDM用量的增加,硫化胶的硬度、拉伸强度、撕裂强度和定伸应力呈现下降趋势、拉断伸长率及耐低温性能有所改善,降低了NBR的耐汽油性能,但提高了耐含乙醇汽油性能.随着增容剂CM用量的增加,硫化胶拉伸强度、撕裂强度、100％定伸应力及硬度都呈增大趋势,采用扫描电镜可以清晰的看到添加CM改性后NBR/EPDM共混胶相容性得到显著改善.     

氯丁橡胶/氯磺化聚乙烯共混胶的性能研究

主要研究了氯丁橡胶(CR)与氯磺化聚乙烯(CSM)的共混比对其共混胶的硫化特性、物理性能、耐老化性能及不同填充体系对CR/CSM共混胶物理性能的影响。实验结果表明:随着CSM用量的增加,CR/CSM共混胶的硬度、拉伸强度逐渐增加,撕裂强度和拉断伸长率呈下降趋势;老化后共混胶的拉伸强度和硬度均有提高,共混胶的撕裂强度和拉断伸长率均有降低。当CR与CSM的共混比为60:40时,随着高岭土用量的增加,共混胶的物理性能呈现下降趋势。     

CM和HDPE对再生橡胶物理机械性能的影响

研究CM和HDPE对再生橡胶物理机械性能的影响。结果表明,再生橡胶的门尼粘度随着CM用量的增加而降低,随着HDPE用量的增加而增加。再生橡胶的拉伸强度和拉断伸长率随着CM和HDPE用量的增加逐渐增加;扫描电镜研究表明,添加CM的再生橡胶硫化胶的拉伸断面相对平整,断层更均匀。综合比较当CM用量为8phr时,再生橡胶的综合性能最佳。     

CM与弹性体共混改性的研究概况

主要论述了弹性体型氯化聚乙烯(CM)与天然橡胶、丁苯橡胶、丁腈橡胶、三元乙丙橡胶、氯磺化聚乙烯橡胶、氯丁橡胶、顺丁橡胶、1,2-聚丁二烯橡胶、聚丙烯酸酯橡胶、氯醚橡胶共混改性领域的研究概况.     

Physical properties of natural rubber/organoclay nanocomposites compatibilized with epoxidized natural rubber

Onium ion‐modified montmorillonite (organoclay) was melt compounded with natural rubber (NR) in an internal mixer and cured by using a conventional sulfuric system. Epoxidized natural rubber with 50 mol % epoxidation (ENR 50) was used in 10 parts per hundred rubber (phr) as a compatibilizer. The effect of organoclay with different filler loading up to 10 phr was studied. Cure characteristics were determined by a Monsanto MDR2000 rheometer, whereas the tensile, compression, and tear properties of the nanocomposites were measured according to the related ASTM standards. While the torque maximum and torque minimum increased slightly, both scorch time and cure time reduced with the incorporation of organoclay. The tensile strength, elongation at break, and tear properties went through a maximum (at about 2 phr) as a function of the organoclay content. As expected, the hardness, moduli at 100% (M100) and 300% elongations (M300) increased continuously with increasing organoclay loading. The compression set decreased with incorporation of organoclay. The dispersion of the organoclay in the NR stocks was investigated by X‐ray diffraction and transmission electron microscopy. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1083–1092, 2006     

Property modification of chloroprene rubber by addition of ultra-fine acrylic rubber powder

Abstract

The role of ultra-fine pre-vulcanised acrylic rubber powder (ACMP) in properties of chloroprene rubber (CR) was studied. ACMP was incorporated into CR at various loadings and the properties of the ACMP filled CR were investigated. Owing to the high thermoplastic nature of the ACMP, better processability is obtained with increasing ACMP loading. Even though the presence of ACMP gives negative effect on cure rate and state of cure, both modulus and hardness of the vulcanisates increase continuously with increasing ACMP loading. The tensile strength is also improved with increasing ACMP loading up to 20 phr. Nevertheless, elasticity and abrasion resistance of the vulcanisates are impaired as the concentration of ACMP is increased. This is mainly attributed to the combination of dilution effect and reduced crosslink density. Since ACMP is fully saturated and highly polar, the incorporation of ACMP into CR gives rise to enhanced aging and oil resistance of the vulcanisates.     

Blends of plasticized poly(vinyl chloride) and waste flexible poly(vinyl chloride) with waste nitrile rubber powder

Blends of poly(vinyl chloride) (PVC) with varying contents of plasticizer and finely ground powder of waste nitrile rubber rollers were prepared over a wide range of rubber contents through high‐temperature blending. The effects of rubber and plasticizer (dioctyl phthalate) content on the tensile strength, percentage elongation, impact properties, hardness, abrasion resistance, flexural crack resistance, limiting oxygen index (LOI), electrical properties, and breakdown voltage were studied. The percentage elongation, flexural crack resistance, and impact strength of blends increased considerably over those of PVC. The waste rubber had a plasticizing effect. Blends of waste plasticized PVC and waste nitrile rubber showed promising properties. The electrical properties and LOI decreased with increasing rubber and plasticizer content. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1552–1558, 2004     

Effects of hygrothermally decomposed polyurethane on the curing and mechanical properties of carbon black‐filled epoxidized natural rubber vulcanizates

Hygrothermally decomposed polyurethane (HD‐PUR) was mixed up to 20 phr in epoxidized natural rubber (with 50 mol % epoxidation; ENR50) recipes, and the curing and mechanical behaviors were studied. Mechanical testing of the ENR50/HD‐PUR vulcanizates determined the tensile, tear, compression‐set, hardness, abrasion, hysteresis, and resilience properties. No significant changes were observed in the tensile properties with the incorporation of HD‐PUR. The ENR50 compounds showed an increase in compression set with increasing HD‐PUR content. Rubbers cured by a semi‐efficient vulcanization system gave the best overall performance. A further improvement in curing and mechanical properties was achieved by the carbon black grade N330 being replaced with a more active grade (N375). © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2265–2276, 2002     

氯化聚乙烯橡胶自由发泡性能的研究

试验研究氢氧化铝、滑石粉和三氧化二锑的用量对氯化聚乙烯橡胶(CM)自由发泡材料的泡孔结构、密度和阻燃性能的影响。结果表明:随着氢氧化铝或滑石粉填料用量的增大,发泡CM的密度增大,泡孔尺寸变小,均匀性变差,发泡体的氧指数随填料用量增大而不断增大,阻燃性能得到提高。三氧化二锑对CM发泡材料泡孔结构及密度影响不大,但在氢氧化铝用量为20份时,少量三氧化二锑能显著提高材料的氧指数。     

丁基橡胶及卤化丁基橡胶阻尼材料的研究进展

介绍了丁基橡胶的阻尼性能及应用,阐述了丁基橡胶、氯化丁基橡胶及溴化丁基橡胶阻尼材料的研究进展.指出提高损耗因子和拓宽阻尼温域是丁基橡胶基高性能阻尼材料的研究方向,丁基橡胶与其他橡胶共混、开发合适的硫化体系和填料是提高丁基橡胶基阻尼材料性能的重要手段.     

CPE在钢丝增强橡胶软管中的应用

介绍了氯化聚乙烯(CPE)与氯丁橡胶、丁苯橡胶并用,制备钢丝增强橡胶软管外胶胶料。产品具有良好的耐候性、抗臭氧性、抗冲击性、耐化学药品性和耐油性等特点,达到GB3683-92要求。而且生产成本低、易于微机控制、减轻了劳动强度。     

Premature vulcanization behaviors of rubber compounds under high shear rates processing

The premature vulcanization behaviors of six kinds of common rubber (NR, BR, SBR, NBR, CR, and EPDM) compounds containing curing agents were studied in a wide processing temperature range (100–140°C) and rotor speed range (30–70 rpm) using a Brabender torque rheometer, which can supply the rubber compounds a high shear rates processing condition. After comparison with the Mooney scorch time (MSt₅), it is shown that Mooney scorch time cannot predict the premature vulcanization time under high shear rate processing. Six models were put forward based on the data obtained from the Brabender mixing head. The regression analysis and variance analysis showed that these models could simulate the premature vulcanization time very well. An explanation was given based on the reactivity and of rubber chain segments: the increasing reactivity and the impact probability of reactive rubber chain segment under high shear rate is the main reason of shorter scorch time of rubber compounds under high shear rate internal mixing. © 2006 Wiley Periodicals, Inc. JAppl PolymSci 102: 5414–5420, 2006