羰基合成原料气中羰基硫、二氧化碳脱除技术的探讨

采用NHD工艺,在近4 MPa的压力下,将羰基合成原料气中的羰基硫与二氧化碳脱除。为降低能耗,进一步优化气体净化流程,设想采用变压吸附工艺,在进压缩机前将二氧化碳脱除。考察了羰基硫与二氧化碳在吸附剂上的选择性。     

炭黑/黏土/丁苯橡胶纳米复合材料的性能

研究了用1份(质量,下同)或2份黏土替代5份或10份炭黑对炭黑/黏土/丁苯橡胶纳米复合材料性能的影响。结果表明,用少量黏土非等量替代炭黑后,复合材料的物理机械性能变化不大;复合材料的耐磨性能随炭黑用量的减少而降低,耐屈挠疲劳性能随黏土用量增加而提高。当炭黑与黏土的填充量分别为45份和2份时,复合材料的物理机械性能和动态生热与填充50份炭黑时相当。     

Parameters governing strain induced crystallization in filled natural rubber

A series of in situ synchrotron X-ray diffraction experiments are performed during the stretching of weakly and highly vulcanized carbon black (CB), silica and grafted silica filled natural rubber sample (NR). Conversely to literature, Mullins effect observed after one stretching cycle modifies the strain induced crystallization (SIC) behaviour of the sample. The onset of crystallization is ruled by the strain amplification induced by the filler presence. Moreover, fillers (CB and silica) behave as additional crosslinks into NR network, through filler-rubber interactions that either accelerate or slow down the crystallization rate depending on NR matrix chemical crosslink density. This is consistent with the assumption that effective network density, which is due to chemical crosslinks, entanglements, and filler-rubber interactions, controls the crystallization rate.     

SSM一步法炼胶工艺对胎面气孔率的影响

试验研究SSM一步法炼胶工艺对半钢子午线轮胎胎面气孔率的影响。结果表明,与传统胎面四段炼胶工艺相比,SSM一步法炼胶工艺生产的胎面胶料的炭黑分散度等级和分散性指数均较高,胶料的流动性提高,物理性能提升,可降低挤出胎面的断面气孔率,最终提升成品轮胎的胎面稳定性、外观质量及耐磨性能。     

提高客车轮胎行驶里程的方法研究

研究轮胎结构和胎面胶配方等因素对295/80R22.5客车轮胎行驶里程的影响。结果表明:采用适当加宽胎面、降低行驶面弧度高、胎肩反弧等设计的直条花纹,胎体骨架材料采用增强钢丝帘线1×3+9+15×0.22+1×0.15,胎面胶配方主体材料采用天然橡胶/炭黑N134,轮胎耐久性能提高,同轮位单胎行驶里程、整车平均行驶里程、单位磨耗里程均显著提高。     

土木工程中碳纤维复合材料的运用研究

碳纤维复合材料是随着纤维增强材料的一个重要组成部分,碳纤维复合材料对于结构补强加固十分有效,其施工质量高,施工效率高,加固效果和综合效益好,具有轻质高强、可设计性强的特点。因此,对碳纤维复合材料的研究和探索,一直是土木工程中关注的重点内容。     

活性炭纤维对水溶液中醋酸丁酯的吸附性能研究

研究了以活性炭纤维为吸附剂从水溶液中吸附醋酸丁酯的吸附静力学、动力学规律及动态吸附特性。实验表明，活性炭纤维对醋酸丁酯的吸附量较大，吸附速度快，动态吸附、脱附性能好。该方法可行，具有一定的实用价值。     

Carbon induced phase transformation in electrospun TiO2/multiwall carbon nanotube nanofibers

Nanofibers of titania and composite nanofibers of titania and multiwall carbon nanotubes were synthesized by electrospinning using a sol-gel process combined with activated carbon nanotubes. The relationships of treatment temperature, carbon nanotube content on the crystal phase, fiber morphology, and electric properties are reported. It is found that the rutile phase becomes more prominent at low heat treatment temperatures with an increase of carbon content in nanofibers, be it for higher amount of carbon due to reducing atmosphere or due to an increase in MWCNT. Atmospheric control and lower heat treatment temperatures enable crystalline nanocomposite fibers of anatase where the level of rutile is below the detection limit of XRD or Raman spectroscopy. This work provides a new path to fabricate electrospun TiO₂/MWCNT nanocomposite nanofibers with limited C-induced rutile phase.     

Sintering behaviour of silicon carbide matrix composites reinforced with multilayer graphene

The scope of this paper includes preparation and characterisation of dense silicon carbide matrix composites reinforced with multilayer graphene (MLG). Application of graphene as a reinforcement phase should simultaneously improve mechanical properties of SiC matrix composites and act as one of the sintering activators. In the present work the mechanical properties and the microstructure changes of samples sintered with different additions of graphene (0.5, 1, 2, 3, 4 wt%) and boron (0.3, 1 and 2 wt%) were examined. The composites were consolidated at two different temperatures (1800 °C and 1900 °C) using the Spark Plasma Sintering method (SPS). Reference samples with the addition of graphite as a source of carbon (1 and 3 wt%) were also sintered in the same conditions. The abovementioned amounts of graphite are an optimal content which is essential to obtain high density of samples [1], [2], [3], [4], [5], [6], [7], [8], [9]. The influence of MLG on density, mechanical properties and phase structure of the sintered samples were investigated. A high rate of densification for the composites with 0.3 wt% of B and 1 wt% of MLG sintered at 1900 °C was observed. Moreover, these composites showed the highest average of microhardness (2663 HV0.5) and single-phase structure.