首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
常温法精细硫化胶粉在轮胎胶料中的应用研究   总被引:2,自引:0,他引:2       下载免费PDF全文
张萍  邓涛  许国玉  李晓勇  赵树高 《橡胶工业》2001,48(10):596-602
以常温法80目精细胶粉用于载重轮胎的胎面和胎侧胶料为例,系统考察了这两种胶料掺用胶粉后的加工性能及其硫化胶的物理性能,其中着重对胶粉在胶料中的分散状态,硫化胶各项常规物理性能以及动态力学性能等进行了试验研究和对比。结果表明,轮胎胶料中掺用80目精细硫化胶粉对其加工性能影响不大,有利于胶料的混炼操作及胎面的流动性,但用量以小于15份为宜;经精炼的胶粉还可以改善胎面胶的撕裂强度、 拉伸强度及耐磨性。  相似文献   

2.
采用四乙烯五胺(TEPA)、六次甲基四胺(HMTA)作为改性剂,分别在150℃、160℃条件下对80目、120目冷冻法胶粉进行改性,并考察了改性胶粉对SBR硫化特性、加工性能及物理性能的影响。结果表明,以HMTA作为改性剂,在150℃条件下改性的胶粉明显改善了SBR硫化胶的物理性能。  相似文献   

3.
朱之锋  刘瑞强  崔淑芳 《轮胎工业》2007,27(10):610-613
试验研究常温粉碎胶粉在轿车子午线轮胎胎侧胶中的应用效果.结果表明,在轿车子午线轮胎胎侧胶中加入胶粉和白炭黑,硫化胶拉伸性能有所降低,耐屈挠性能提高,综合物理性能变化不大;胶粉和白炭黑对胶料的加工性能和轮胎成品性能无明显不良影响.  相似文献   

4.
炭黑和碳纳米管对丁腈橡胶性能的影响   总被引:1,自引:0,他引:1       下载免费PDF全文
王彦  段友顺  于洋  夏琳  辛振祥 《橡胶工业》2016,63(9):545-547
研究炭黑和碳纳米管对常温和高温下丁腈橡胶(NBR)物理性能和耐热空气老化性能的影响。结果表明,增大炭黑用量或加入碳纳米管,胶料的Payne效应增强,加工性能降低,常温下硫化胶的耐热空气老化性能变化不大;与常温相比,高温下硫化胶的物理性能和耐热空气老化性能显著降低。  相似文献   

5.
研究了胶粉及活化胶粉胶料的加工流变性能。结果表明,胶人及活化胶粉的加入均能缩短胶料的硫化时间,对硫化速度影响不大;采用素炼法及共素炼法均可明显提高活化胶粉胶料硫化胶的物理机械性能;随活化胶粉用量的增加,炭黑共混胶料的粘度变化不大,挤出胀大比减小。  相似文献   

6.
系统研究了采用常温粉碎、水射流粉碎、湿法粉碎和冷冻粉碎等工艺制备的4种胶粉基本性质及其在丁苯橡胶(SBR)中的应用性能。结果表明,4种胶粉(GTR)的表面形貌和组成以及在丁苯橡胶中的使用性能均有较大差异,其中湿法胶粉比表面积较大,冷冻法胶粉表面形貌光滑。将4种胶粉分别加入到丁苯橡胶中,相应混炼胶的t90和t10均缩短;随着胶粉用量的增大,t90和t10均持续缩短。在实验范围内,湿法胶粉硫化胶拉伸强度均优于其他胶粉硫化胶。胶粉表面形貌粗糙,比表面积较高,其SBR硫化胶拉伸强度较高。  相似文献   

7.
《弹性体》2017,(5)
对常温法破碎的轮胎胶粉进行表面活化改性制备了活化胶粉,并将水切割胶粉(WRP)及活化后的常温胶粉应用于胎冠胶中,研究了WRP及活化胶粉对并用胶的门尼黏度、硫化特性及物理机械性能的影响。结果表明,WRP和活化胶粉的加入均使混炼胶的门尼黏度升高,且随着胶粉用量增加,门尼黏度值呈增高趋势;并用胶的硫化特性表明,由于胶粉对硫黄的吸附作用,并用胶的硫化速度降低、正硫化时间延长;硫化胶的拉伸性能和撕裂强度均随着胶粉的掺入而降低,耐磨性提高,且硫化胶老化后硬度增大,拉伸强度升高,拉断伸长率下降。  相似文献   

8.
研究冷冻法废轮胎胶粉的粒径和用量对丁苯橡胶(SBR)性能的影响。结果表明:随着冷冻法废轮胎胶粉用量的增大,SBR混炼胶的t_(s1)和t_(90)明显缩短,但在胶粉用量达到10份后变化不大,F_L呈增大趋势,F_(max)呈减小趋势,门尼粘度逐渐增大,胶粉粒径对门尼粘度影响不大;SBR硫化胶的100%定伸应力和300%定伸应力逐渐提高,拉伸强度和拉断伸长率逐渐降低,撕裂强度变化不大,阿克隆磨耗量逐渐增大;加入冷冻法废轮胎胶粉后SBR硫化胶的储能模量明显提高,损耗因子增大。  相似文献   

9.
研究冷冻法废轮胎胶粉的粒径和用量对丁苯橡胶(SBR)性能的影响。结果表明:随着冷冻法废轮胎胶粉用量的增大,SBR混炼胶的t_(s1)和t_(90)明显缩短,但在胶粉用量达到10份后变化不大,F_L呈增大趋势,F_(max)呈减小趋势,门尼粘度逐渐增大,胶粉粒径对门尼粘度影响不大;SBR硫化胶的100%定伸应力和300%定伸应力逐渐提高,拉伸强度和拉断伸长率逐渐降低,撕裂强度变化不大,阿克隆磨耗量逐渐增大;加入冷冻法废轮胎胶粉后SBR硫化胶的储能模量明显提高,损耗因子增大。  相似文献   

10.
GMA原位改性炭黑对EPDM胶料性能的影响   总被引:5,自引:1,他引:4       下载免费PDF全文
姜其斌  贾德民  杨军 《橡胶工业》2004,51(4):205-208
探讨甲基丙烯酸缩水甘油酯(GMA)原位改性炭黑对EPDM胶料硫化特性和硫化胶性能的影响。结果表明,GMA起连接炭黑与橡胶的作用.对胶料的硫化特性影响显.提高了硫化胶的物理性能、粘合性能和常温(30~60℃)下的减震阻尼性能;GMA用量为5份时,EPDM胶料的硫化速度较快,硫化胶的表观交联密度较大,物理性能和粘合性能较好。  相似文献   

11.
12.
Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.  相似文献   

13.
In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.  相似文献   

14.
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.  相似文献   

15.
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.  相似文献   

16.
17.
18.
Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.  相似文献   

19.
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号