氯化丁基橡胶和氯丁橡胶的并用研究

本文通过试验主要研究了并用比例、硫化体系、炭黑品种及用量等因素对CIIR/CR并用胶物理机械性能、耐老化性能及耐臭氧老化性能等的影响。结果发现在CIIR/CR并用胶中随CIIR用量比例的增加,其硫化胶的扯断伸长率会随之提高。CIIR的加入对会有效改善CR的耐老化性能及耐臭氧老化性能。炭黑N550在用量为40~50份时,CIIR/CR硫化胶物理机械性能相对较好。     

氯化丁基橡胶罩体材料的研究

对国内外的防毒面具罩体材料进行对比分析，选择了氯化丁基橡胶做罩体材料并进行了配方设计实验研究，选出了较好配方，进行了性能对比和防毒面具罩体试制，达到了预期目的。     

聚丙烯无卤阻燃材料的研究与展望

综述了近年来国内外聚丙烯阻燃技术、阻燃剂及阻燃机理的研究现状，并对其发展前景进行了展望。     

溴化丁基橡胶/氯化丁基橡胶并用胶的制备及性能

用差示扫描量热仪测定了溴化丁基橡胶/氯化丁基橡胶(BIIR/CIIR)共混胶的玻璃化转变温度,研究了不同并用比(质量比)共混胶的相容性、硫化特性以及力学性能和热稳定性。结果表明,不同并用比的BIIR/CIIR共混胶仅有1个玻璃化转变温度,表明BIIR和CIIR具有良好的相容性;BIIR的焦烧时间比CIIR短,共混胶的焦烧时间介于BIIR和CIIR之间,而正硫化时间比BIIR和CIIR都长;共混硫化胶的拉伸强度、撕裂强度均优于BIIR和CIIR硫化胶,热稳定性与BIIR相当;当BIIR/CIIR的并用比为80/20时,共混硫化胶的综合性能最好。     

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.     

氯化丁基橡胶/聚丙烯共混改性的研究

采用橡胶与塑料共混改性的方法，制备了具有较好加工工艺性能的氯化丁基橡胶／聚丙烯共混物。研究了橡塑共混比、共混温度以及硫化时间对共混物力学性能的影响。结果表明：氯化丁基橡胶／聚丙烯共混配比为90／10，炭黑30份，氧化锌5份，氧化镁2份，促进剂DM2份，促进剂TMTD1份，硬脂酸1份时，可获得综合性能良好的共混胶料。     

氯化丁基橡胶/丁腈橡胶宽温域阻尼材料的制备及性能研究

制备氯化丁基橡胶(CIIR)/丁腈橡胶(NBR)宽温域阻尼材料,研究CIIR/NBR并用比以及765树脂、木质纤维素和石墨烯的用量对并用胶阻尼性能的影响。结果表明,当CIIR/NBR并用比为30/70,765树脂、木质纤维素和石墨烯的用量分别为4,10和5份时,并用胶具有较宽的阻尼温域。     

Long-time sulfenamide-accelerated sulfur vulcanization of natural rubber/chlorobutyl rubber compounds

Sulfenamide-accelerated sulfur vulcanization of natural rubber/chlorobutyl rubber compounds has been investigated at temperatures from 155 to 175°C over 0.1 to 400 min. Continuous measurements in a Cone Rheometer were used to estimate the extent of crosslinking, which was plotted against cure time. On the basis of a kinetic analysis, two first-order vulcanization reactions, crosslinking and degradation, have been evaluated. Over the temperature range studied, there is no significant difference between the values of activation energy for these reactions. The rate of the degradation is slower by a factor of 20 than the rate of crosslinking. The degradation reaction can be limited by increasing the “efficiency” of the vulcanizing system.     

无卤阻燃型天然橡胶的研究

该文研究了阻燃剂种类和用量对天然橡胶硫化胶的阻燃性能、力学性能和硫化特性的影响。结果表明：单用氢氧化铝时,随着用量增加,硫化胶阻燃性能上升,但力学性能有所下降,氢氧化铝用偶联剂A151表面改性处理后,硫化胶力学性能有所改善;红磷作为阻燃剂用量比较少,在提高硫化胶阻燃性的同时可改善其力学性能;氢氧化铝、红磷和三氧化二锑并用可产生较好的阻燃协同效果,同时会加快橡胶的硫化速度。     

硅橡胶阻燃材料的研究

分别探讨了氢氧化铝、氢氧化镁和硼酸锌等无机阻燃剂的用量对硅橡胶的阻燃性能及力学性能的影响。结果表明：当用量超过15份时，3种阻燃剂都能满足电缆附件的阻燃要求；在相同的用量下，氢氧化铝的阻燃性能优于氢氧化镁和硼酸锌；氢氧化铝用量为30份时，硅橡胶综合性能达到最佳。并且考察了软化剂1，2-丙二醇用量对硅橡胶综合性能的影响，得出其最佳用量为2份。     

用常温塑化法再生氯化丁基橡胶

研究了硫化促进剂种类、硫黄及硬脂酸用量对氯化丁基橡胶再生胶物理机械性能的影响.结果表明,单独使用促进剂CZ时硫化再生胶的综合性能较好,拉伸强度达到6.1 MPa,扯断伸长率达到679%,焦烧安全性良好.硫化再生胶的最大转矩随着硫黄用量的增加而增大,胶料的硫化平坦性较好,无硫化返原现象.当硫黄用量为0.5份(质量)时,硫化再生胶拉伸强度最高;超过1.5份(质量)后出现喷霜现象.硬脂酸的使用会对硫化再生胶的物理机械性能产生负面影响.     

Effect of nano clay on the constrained polymer volume of chlorobutyl rubber nanocomposites

The dynamic mechanical properties of chlorobutyl rubber nanocomposites containing different varieties of clay have been investigated. The clay moieties have been chosen so that they vary in their organic modification, modifier concentration, and d spacing. The viscoelastic properties such as storage modulus, damping behavior, and loss modulus of polymer composites depends on matrix filler interaction, crystallinity, and extent of crosslinking. The prepared composites were characterized by X Ray Diffraction, and the extend of exfoliation/intercalation was studied. It has been observed that the storage modulus of the composites increased with the addition of filler due to the enhancement in stiffness of the material. The damping behavior was found to decrease with the addition of filler and this was attributed to the restricted movement of the polymer segments. The higher surface area to volume ratio of the layered silicate resulted in the better interaction between the polymer matrix and filler. The variation of loss as well as storage modulus of the nanocomposites were evaluated as a function of filler loading, and a comparison of the properties of the rubber nanocomposites containing different organic clay was also carried out. Finally, a calculation of constrained volume of polymer chains was done in the nanocomposites. POLYM. COMPOS., 36:2135–2139, 2015. © 2014 Society of Plastics Engineer     

Effect of silica filler on aluminum-aluminum bonding by a self-vulcanizable blend based on chlorobutyl rubber and carboxylated nitrile rubber

Silica filler improves the aluminum-aluminum bonding by a self-vulcanizable rubber blend based on chlorobutyl rubber and carboxylated nitrile rubber. The joint peel strength depends on the filler loading, the state of cure, the molding temperature, and the adhesive film thickness. The higher peel strength in the filled adhesive system is due to filler reinforcement resulting in tear path deviation and the formation of Si—O—Al linkage at the aluminum-adhesive interface. Maximum peel strength was obtained at 10 phr filler loading, when the molding temperature was 180°C and the molding pressure was 0.35 MPa.     

Flame‐retarded polyethylene terephthalate with carbon microspheres/magnesium hydroxide compound flame retardant

A novel compound flame retardant (carbon microspheres/magnesium hydroxide, abbreviated as CMSs/MH) was used to improve the fire performance of polyethylene terephthalate (PET). LOI, UL94, and Cone test results showed that CMSs/MH/PET composites obtained the best fire performance at the mass ratio of CMSs to MH, which was 5:5, where the CMSs/MH content was 1.0 wt. % of PET. The Py‐CS‐MS, TGA‐DSC results, and morphology of char residue revealed the flame‐retardant mechanism. CMSs/MH increased the thermal stability of PET by increasing the activation energy at the initial combustion stage. At the second stage of combustion, CMSs/MH increased the chance of recombination of free radicals and slowed the combustion. Additionally, CMSs/MH promoted the cross‐linking of pyrolysis products and further improved the continuity of the char layer. Thus, a dense and continuous char layer of CMSs/MH/PET composites was produced; this char layer reduced the heat release rate and increased the amount of char residue.     

耐高温无卤阻燃硅橡胶的研究

以N,N-1,2-二乙基-双(1,3,5-三嗪-2,4,6-三胺)(ETT)为阻燃剂、硼酸锌和氧化锌为阻燃协效剂,制备耐高温无卤阻燃甲基乙烯基硅橡胶(MVQ)材料,并研究其阻燃性能、物理性能和耐热空气老化性能。结果表明,当阻燃剂ETT用量为56份、硼酸锌用量为3份、氧化锌用量为1份时,MVQ垂直燃烧级别达到FV-0,氧指数为38,综合物理性能和耐热空气老化性能均较好。     

无卤阻燃NR的性能研究

研究氢氧化镁、氢氧化镁/红磷并用以及氢氧化镁/红磷/纳米高岭土并用对NR胶料物理性能和阻燃性能的影响.结果表明,与单独使用氢氧化镁相比,氢氧化镁/红磷并用能有效提高胶料的氧指数,降低烟密度,改善胶料的物理性能;采用氢氧化镁/红磷/纳米高岭土并用可以进一步提高胶料的氧指数,烟密度较氢氧化镁/红磷并用胶料略大,但比单独使用氢氧化镁显著降低,且物理性能进一步提高.当氢氧化镁、红磷和纳米高岭土的用量分别为92,8和20份时,胶料的综合性能较好.