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研究煅烧高岭土(国产普通煅烧高岭土PBK1250、进口普通煅烧高岭土Iceberg和氨基硅烷偶联剂改性陶土Burgess2211)在药用溴化丁基橡胶(BIIR)瓶塞胶料中的应用。结果表明:采用普通煅烧高岭土PBK1250的胶料与采用普通煅烧高岭土Iceberg的胶料硫化特性相当;采用改性陶土Burgess2211的胶料硫化速度较快,硬度、定伸应力和撕裂强度较高,拉断永久变形较小,采用普通煅烧高岭土Iceberg的胶料的拉断永久变形较大;采用普通煅烧高岭土Iceberg的药用BIIR瓶塞耐萃取性较好,采用普通煅烧高岭土PBK1250的药用BIIR瓶塞与药品的高温相容性略高。 相似文献
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分别对用不同粒径煅烧高岭土填充的卤化丁基橡胶进行了性能研究,由于团聚,胶料的硫化性能和物理机械性能受到了很大影响。在此基础上进一步对改性高岭土进行了研究。改性高岭土在胶料中的分散性可以得到明显改善,采用Si-69改性后胶料的综合性能最佳。高岭土的用量对胶料的性能也产生很大的影响。 相似文献
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丁基胶药用瓶塞质量控制湖北华强药用包装制品厂李吉生,程继刚瓶塞是瓶装药物的主要封口件和导出件,由于其与药物直接或间接接触,因此必须满足药物对其的要求。从生物角度要求,瓶塞必须无致热、无毒性:从卫生角度着眼,瓶塞必须洁净无菌;从药品的贮存来讲,瓶塞必须... 相似文献
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设计补强填料(炭黑N990/硫酸钡)用量和并用比不同的9个试验配方,研究炭黑N990/硫酸钡用量和并用比对氟醚橡胶胶料硫化特性、耐低温性能、物理性能、耐热空气老化性能、耐介质性能和压缩永久变形的影响。结果表明:炭黑N990/硫酸钡用量和并用比对氟醚橡胶硫化胶性能影响较大;随着炭黑N990/硫酸钡用量的增大,氟醚橡胶硫化胶的力学性能更好;氟醚橡胶硫化胶的耐低温性能主要由橡胶的分子结构决定,同时含胶率越高,硫化胶的耐低温性能越好;氟醚橡胶硫化胶的耐介质性能与其交联程度有关,当炭黑N990/硫酸钡用量增大时,橡胶与其形成的交联网络更加密集,硫化胶的耐介质性能提高。 相似文献
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虽然静态力学性能对轮胎的使用寿命起了重要作用,但是对动态性能也要有足够的重视。事实上,随着轮胎磨损,其性能就像一枚硬币的两面。 相似文献
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China clay (kaolin) has been modified with sodium salt of rubber seed oil (SRSO). SRSO was characterized using X‐ray diffraction (XRD), infrared spectroscopy (FTIR), and differential thermal analysis (DTA). XRD of the unmodified and SRSO‐modified kaolins showed an increase in the d‐(001) spacing of kaolin platelets from 7.15 to 14 Å. FTIR spectroscopy indicated possible grafting of the organic moiety of rubber seed oil (RSO) onto the clay surface. DTA of the SRSO‐modified kaolin indicated that the SRSO is more strongly bound in a constraint environment within the lamellae of kaolin. Natural rubber (NR) mix containing 10 phr of SRSO‐modified kaolin was found to cure faster than that of a similar mix containing unmodified kaolin. NR vulcanizates containing SRSO‐modified kaolin showed considerable increase in tensile modulus, tensile strength, and elongation at break indicating its potential as an organomodified nanofiller. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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A mineral sepiolite (magnesium silicate with microfibrilar morphology) was calcined at 325°C and its behavior as filler for ethylene‐propylene (EPM) compounds designed for electrical cable coating was studied. This calcined sepiolite is a material with good dielectric and physical properties and provides a reinforcing effect, increased when is treated with a coupling agent. The performance of this filler was compared to a commercial clay calcined at 1000°C. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 714–718, 2001 相似文献
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Locally sourced red earth (RE) was air‐dried, pulverized, and screened with a sieve of mesh size 75 nm. It was characterized in terms of its moisture content, loss on ignition, silica content, iodine adsorption number, oil absorption, pH, and metal oxide compositions. Natural rubber, standard Nigerian rubber used for this work was first characterized in terms of its dirt, ash and nitrogen contents, volatile matter, plasticity retention index, and Mooney viscosity. The RE was applied as filler wholly and in blends with standard carbon black, CB (N330) filler in the natural rubber compounding using efficient vulcanization system. The cure and the physicomechanical properties of the compounds and vulcanizates were, respectively, measured as function of filler loading. The results were compared with those of the standard carbon black (N330)‐filled natural rubber. It was found, that the RE‐filled natural rubber showed substantial reinforcement of the rubber, though inferior to carbon black (N330) filled vulcanizates, the tensile strength of the carbon black‐filled vulcanizates is about one half times that of the RE‐filled vulcanizates. The tensile properties of the RE‐filled vulcanizates improved markedly by blending the RE‐filler with the carbon black (N330). © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
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A study of diatomite and calcined kaoline properties in anticorrosion protective coatings 总被引:2,自引:0,他引:2
Comparison of properties of diatomite and kaoline in paints were studied in dependence on their volume concentration (PVC). Model paints were prepared containing increasing filler contents, PVC = 5% up to the critical volume concentration of the pigment (CPVC). The properties of the prepared coatings were tested by laboratory corrosion tests in both the neutral salt mist and the condensation moisture environments. The effect of diatomite and kaoline PVC on mechanical and anticorrosion protective properties of coats based on epoxide and epoxy–ester binders was studied. It was established that diatomite can be used as a filler in anticorrosion protective coatings. 相似文献
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Kaolin modified with sodium salt of rubber seed oil as a reinforcing filler for blends of natural rubber,polybutadiene rubber and acrylonitrile–butadiene rubber
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Vijay V Raji Surya Ramakrishnan Rugmini Sukumar Methalayil Brahmakumar AR Ravindranatha Menon 《Polymer International》2015,64(11):1585-1593
Blends of natural rubber (NR) and synthetic rubbers are widely used in the rubber industry to meet specific performance requirements. Further, the emerging field of organomodified clay/rubber nanocomposites could provide a host of novel materials having a unique combination of properties to meet various stringent service conditions. Previous studies have shown that at very low dosages, china clay (kaolin) modified with sodium salt of rubber seed oil (SRSO) improved the cure characteristics and physico‐mechanical properties of NR. Results of the present study show improved cure characteristics and physico‐mechanical properties for blends of NR with butadiene rubber and nitrile rubber containing 4 phr of SRSO‐modified kaolin as indicated by reduction in optimum cure time along with higher tensile strength, tensile modulus and elongation at break for their vulcanizates as compared to those containing unmodified kaolin. The SRSO‐modified kaolin/rubber nanocomposites showed improved flex resistance, reduced heat build‐up, tan delta and loss modulus and higher chemical crosslink density index, indicating a reinforcing effect of the SRSO‐modified kaolin, enabling the nanocomposites to have potential industrial applications. © 2015 Society of Chemical Industry 相似文献
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将新型旋转填充床反应器(RPB)应用于阳离子聚合制备丁基橡胶(IIR)过程。实验初步考察了旋转填充床转子转速(N)和聚合温度(Tp)等工艺参数对聚合产物IIR分子量和分子量分布的影响规律。研究结果表明:在实验条件下,当N=1200 r·min-1、Tp=-100℃时,采用超重力法新工艺制备的IIR的数均分子量达到2.89×105,分子量分布指数达到1.99。同时,物料停留时间小于1 s (现工艺30~60min),单位设备体积的生产效率提高了2~3个数量级。随着N的增大和Tp的降低,聚合产物IIR的分子量升高,而分子量分布变化不大。 相似文献