不同粒径和结构度炭黑填充集成橡胶的性能研究

研究不同粒径和结构度炭黑填充集成橡胶(SIBR)的性能。结果表明:高结构度的BL系列炭黑和大粒径的炭黑N774均使SIBR胶料的焦烧时间和硫化时间延长;随着炭黑结构度的提高,胶料的门尼粘度和交联密度增大;结构度最高的炭黑BL302填充硫化胶的定伸应力最大,耐老化性能最好;结构度大、粒径小的炭黑BL201填充胶料的Payne效应最强,生热也较大;在0℃下炭黑N774,N660,N550,N330,N220,BL201,BL101,BL302填充硫化胶的损耗因子依次减小,抗湿滑性能下降。     

不同炭黑对溶聚丁苯橡胶性能的影响

研究不同炭黑对溶聚丁苯橡胶(SSBR)性能的影响。结果表明:在密炼(一段混炼)过程中炭黑N330填充SSBR胶料的温度和功率均较高,不同炭黑填充SSBR胶料的粘-切依赖性大致相同;炭黑粒径越小、结构度越高,其填充SSBR胶料的Payne效应越显著;炭黑SP5000填充SSBR胶料的焦烧时间最长,炭黑N115,N234,N330和N550填充SSBR胶料的硫化速率稍快;粒径较小的炭黑填充SSBR硫化胶的物理性能和耐磨性能较优,但压缩温升较高;粒径相近而结构度较高的炭黑填充SSBR硫化胶的物理性能优于结构度较低的炭黑填充硫化胶;粒径较大的炭黑填充SSBR硫化胶的抗湿滑性能较好和滚动阻力较低,炭黑N774填充SSBR硫化胶的抗湿滑性能最好,且滚动阻力最低。     

不同炭黑填充溶聚丁苯橡胶的性能研究

研究不同粒径炭黑对溶聚丁苯橡胶(SSBR)性能的影响。结果表明:结构度高的炭黑填充SSBR混炼胶的加工性能较差;高结构度BL系列炭黑填充SSBR硫化胶的定伸应力、拉伸强度、撕裂强度和补强因子均比低结构度炭黑N220和N330填充硫化胶高;炭黑BL201,BL101,BL302,N220和N330填充SSBR混炼胶的剪切储能模量和剪切耗能模量依次减小,BL系列炭黑填充SSBR硫化胶在0℃下的损耗因子较小,抗湿滑性能较差。     

改性凯孚碳素在工程机械轮胎胎体帘布胶中的应用

研究改性凯孚碳素作为补强剂在工程机械轮胎胎体帘布胶中的应用。结果表明：填充改性凯孚碳素的工程机械轮胎胎体帘布胶的硫化特性与填充炭黑N660和N774的胶料基本相近,拉伸强度比填充炭黑N660的胶料小,与填充炭黑N774的胶料相近,拉断伸长率大,压缩疲劳温升比填充炭黑N660和N774的胶料低,回弹值比填充炭黑N660的胶料高;改性凯孚碳素填料/炭黑N660并用比为1/1填充胶料的性能与填充炭黑N774的胶料基本相同,可替代工程机械轮胎胎体帘布胶料中的炭黑N774,胶料性能符合企业的控制指标要求。     

填充体系对橡胶悬置元件性能的影响

研究填料种类、用量及并用比对橡胶悬置元件性能的影响。随着炭黑粒径的增大,胶料的门尼粘度和交联密度减小,硫化胶的耐老化性能提高,动静刚度比减小;随着炭黑N550用量的增大,硫化胶的硬度、定伸应力和撕裂强度提高,动静刚度比增大;随着白炭黑用量的增大,炭黑N774与白炭黑并用填充硫化胶的拉伸强度无明显变化,动静刚度比显著增大;在相同硬度下,纯白炭黑填充硫化胶的动静刚度比小于炭黑N774与白炭黑并用填充硫化胶。     

炭黑对高阻尼天然橡胶/溴化丁基橡胶并用胶性能的影响

研究不同种类炭黑对高阻尼天然橡胶/溴化丁基橡胶(NR/BIIR)并用胶性能的影响。结果表明:炭黑用量相同时,炭黑结构度越高、粒径越小,胶料物理性能越优;炭黑N774填充胶料的阻尼性能最优;对于相同硬度的高阻尼NR/BIIR并用胶,炭黑N110填充胶料的常温阻尼性能最优。     

炭黑对IIR1751性能影响的研究

考察了不同炭黑对IIR1751橡胶硫化特性、交联密度、力学性能及动态力学性能的影响,并分析了炭黑在相应胶料中的分散状况。结果表明,随着炭黑比表面积的增大,IIR1751混炼胶门尼粘度增大,炭黑N375填充的胶料焦烧时间最长;粒径太小或结构度太高的炭黑均不利于在其混炼胶中分散,但炭黑N330在其混炼胶中分散性最好;炭黑N220填充的胶料交联密度最大;不同炭黑填充的IIR1751硫化胶tanδ峰值,ΔG′,G″有明显差别;炭黑N220,炭黑N347和炭黑N375填充的硫化胶永久变形较大,炭黑N330填充的胶料各项力学性能比较均衡。     

炭黑结构度及粒径变化对NBR动态生热及应力松弛的影响

研究了炭黑N220和炭黑N774结构度及粒径变化对NBR硫化胶动态生热及应力松弛的影响。结果表明,降低炭黑结构度且增大粒径,NBR胶料M_L和M_H均降低,t₁₀延长,同时还会加快硫化胶应力松弛过程,不可松弛分量和可松弛分量均降低。随着炭黑结构度降低、粒径增大和测试温度升高,硫化胶动态生热均有所降低。结合胶含量高的硫化胶低温Δtanδ变化较为明显。增大拉伸变形会提高应力松弛中不可松弛分量和可松弛分量。降低炭黑结构度、增大粒径且减小压缩变形量,硫化胶压缩应力松弛中可松弛分量减小。     

炭黑和硫化程度对天然橡胶硫化胶疲劳性能的影响

研究了4种不同粒径的炭黑和不同硫化程度对天然橡胶(NR)硫化胶在25℃和100℃下耐疲劳性能的影响。结果表明,NR硫化胶的疲劳性能与炭黑粒径、硫化程度和疲劳温度有关,不同炭黑填充的NR硫化胶在100℃下的疲劳寿命均高于25℃下的疲劳寿命,100℃下疲劳破坏后胶料的交联密度增高,而25℃下疲劳破坏后则降低;100℃下以工艺正硫化时间(t_(90))制备的胶料疲劳寿命高,填充大粒径炭黑有利于延缓胶料的初始破坏,25℃下以理论正硫化时间(t_(100))制备的胶料疲劳寿命高,填充小粒径炭黑有利于延缓胶料的初始破坏。     

废旧轮胎热裂解炭黑在低温氟橡胶胶料中的应用研究

研究废旧轮胎热裂解炭黑（CBp）在低温氟橡胶胶料中的应用,并与炭黑N990对比。结果表明：与炭黑N990填充低温氟橡胶胶料相比,CBp填充低温氟橡胶胶料的焦烧时间延长,交联程度增大;CBp填充低温氟橡胶胶料中填料-填料和填料-橡胶基体相互作用较炭黑N990填充低温氟橡胶胶料强;CBp填充低温氟橡胶硫化胶的硬度和定伸应力较大,但拉伸强度和拉断伸长率较小,而拉伸强度仍能达到15.8 MPa;CBp填充低温氟橡胶硫化胶的耐低温性能稍逊于炭黑N990填充低温氟橡胶硫化胶。     

与强者同场竞技 靠创新促进发展——访青岛福润德塑料挤出技术有限公司总经理赵炳仁先生

一年一届的中国国际塑料橡胶工业展览会(国际橡塑展),是全球多个行业寻找橡塑工业世界性商贸伙伴的机遇,也是企业开拓中国以至亚洲市场商机之"金钥匙"。在25届国     

Hydrogels reinforced with nanoclays with improved response rate

Two series of semiinterpenetrating networks (SIPN) based on linear hydrophilic poly(vinyl alcohol) (PVA) and thermo‐responsive poly(N‐isopropylacrylamide) (PNIPA), physically crosslinked with inorganic clay, are presented. The hydrogels with different crosslinking densities were prepared by varying the content of clay from 1 to 6 wt % and contained linear interpenetrant, PVA in the range of 0.5–1.5 wt %. The effect of clay content on swelling/deswelling behavior and phase transition in PNIPA gels, as well as the feasibility of reinforcing the gels with high molecular weight PVA, were analyzed. The thermal response of hydrogels, followed by DSC, confirmed that the insertion of hydrophilic PVA did not have a significant effect on the onset of the volume phase transition temperature, while the response was faster. The equilibrium degree of swelling of SIPNs and PNIPA hydrogels was in the range of 9–79 and decreased with increasing content of clay. The internal morphology and surface wettability of the hydrogels were investigated by scanning electron microscope analysis and contact angle measurements, respectively. The network structural parameters of the PNIPA and SIPN nanocomposites hydrogels, such as the average molecular weight between crosslinks, M_c, and effective crosslinking density, N_e, were determined by dynamic mechanical analysis. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44535.     

Electrodialysis with brine solutions oversaturated with calcium sulfate

Electrodialysis (ED) was applied to concentrate brine solutions of various concentrations — similar to effluentsfrom the desalination of brackish and industrial water — to about 20%. The consequent reduction in effluent volumes would facilitate a reduction in disposal costs. The energy requirement for concentrating solutions from 70 to 300 mN (0.4-1.8%) to 3.9 N (20%) was in the range 1.5-7.1 kWh/m³, in contrast to approximately 25 kWh/m³ by thermal evaporation. With the aim of preventing precipitation of CaSO4 on the membranes, laboratory-scale ED experiments were carried out on solutions of different compositions to determine the conditions that would lead to the precipitation of excess gypsum on gypsum seeds in a separate precipitator. The results were then applied in a pilot-scale ED unit in which the brine that circulated through the ED brine cells passed through a separate CaSO, precipitator containing gypsum seeds.     

Biological studies with cyclopropenoids inactivated with fatty acids

Cyclopropenoids inactivated by reactingSterculia foetida oil with cottonseed oil fatty acids were fed at three dietary levels to growing rats and laying hens for 4 weeks. At the termination of the experiments, all animals were autopsied and examined microscopically for pathological lesions, but no pathology that could be related to dietary treatment was observed. Hemoglobin, packed cell volume and plasma cholesterol were similar in animals fed all of the diets. Growth rate of rats and egg production of hens fed the experimental diets were similar to those of animals fed the control diet. After 3 and 6 months of storage, eggs from hens fed the inactivated cyclopropenoids were normal and showed no evidence of the unusual characteristics of cyclopropenoid feeding. Lipids of heart, liver and adipose tissues of all the rats and hens varied little from the normal fatty acid composition. Small amounts of three unidentified fatty acids were found in the adipose tissues of rats fed the higher levels of inactivated cyclopropenoids. The results of these feeding studies suggest that inactivation of cyclopropenoids with fatty acids eliminates the unusual biological effects attributable to cyclopropenoids. Presented at the AOCS Meeting, New Orleans, April 1970.     

高压电动机受潮现场处理的技术分析

山东铝业公司水泥厂（以下简称我厂）运行的大型高压电动机较多．有时由于长时间停运或者环境的潮湿，导致电动机的绝缘水平下降，致使电动机不能再次正常启动。因大型电动机是企业的关键设备，其运行好坏直接影响企业生产的正常与否，进而影响企业效益。     

以创新谋发展 以协作促转型

复合肥行业的转型升级已被列为化肥行业"十三五"规划重要内容。介绍我国复合肥行业转型发展期的特征,并提出在此形势下复合肥行业的发展思路;以创新谋发展,促进行业技术水平提高;以协作促转型,助推行业转型发展。     

以创新铸就名牌 以名牌促进发展

介绍厦门正新橡胶工业有限公司在观念、产品、管理和技术方面开展创新活动的经验。观念创新是名牌战略的灵魂,相互理解与支持、创建伙伴关系是公司对外往来的原则,坚决实施名牌战略,坚持以人为本、适才适用的原则;产品创新是占领市场的法宝,根据市场需求不断适时开发新产品;管理创新是维护品牌形象的前提,各项试验均执行企业内控标准,严把产品质量关;技术创新是实施名牌战略的源泉,以自有技术开发各种轮胎。通过开展创新活动,公司利税指标一直位居国内前列。     

Crosslinking of styrene-butadiene rubber with polyurethanes bicapped with benzyocyclobutene

Summary A polyurethane prepared from 1,9-nonanediol and toluene-2,4-diisocyanate with M_n=11,840, was capped on both ends in a reaction with 4-(benzocyclobutenyl) methanol. The polyurethane was used to crosslink styrene-butadiene rubber through Diels-Alder reactions on the benzocyclobutene functionality. The synthesis and characterization of 4-(benzocyclobutenyl) methanol, a molecule not reported previously, is presented. The crosslinking reaction was carried out on intimate mixtures of the telechelic polyurethane and SBR at elevated temperature and pressure. Various physical properties of the crosslinked material were studied.Work done at the Department of Chemistry, University of Akron, Akron, OH 44325, USA     

Boundary-Layer Structure with Hydrogen Combustion with Different Injection Intensities

Results of numerical simulation of the influence of intensity of hydrogen injection through a porous surface in the case of hydrogen burning in the boundary layer are presented. Turbulent characteristics of the flow were simulated using the k–epsiv; turbulence model with Chien's modification for low Reynolds numbers. The diffusion model (infinitely large burning rate) was used to describe the chemical reaction process, but the difference in diffusion coefficients of different substances was taken into account. A comparison of injection with and without combustion shows that the presence of a heat-release front delays the laminar–turbulent transition and significantly deforms the profiles of density and viscosity of the gas mixture. As the injection velocity increases, the flame front is shifted from the porous surface toward the outer edge of the boundary layer. The contributions of injection itself and combustion to reduction of skin friction are analyzed. Key wrds: boundary layer, combustion, porous injection, heat and mass transfer, friction.