煤矿用阻燃钢丝绳芯输送带黏合胶的研制

介绍煤矿用阻燃钢丝绳芯输送带黏合胶的配方研制。主要讨论了主体材料的选择，硫化体系、补强体系、防护体系、软化增塑体系、阻燃体系的确定，从而优化煤矿用阻燃钢丝绳芯输送黏合胶配方设计。采用该黏合胶生产的输送带产品达到MT668—1997《煤矿用阻燃钢丝绳芯输送带技术条件》标准的要求。     

阻燃钢丝绳芯输送带粘合胶配方研制

介绍煤矿用阻燃钢丝绳芯输送带粘合胶的配方研制。在研制过程中发现,不同生产厂家的氯丁橡胶硫化速度不同;促进剂DM具有防焦烧的功效;防老剂BLE(c)对胶料与镀锌钢丝绳的粘合有帮助。采用该粘合胶生产的输送带产品能达到《煤矿用阻燃钢丝绳芯输送带技术条件》标准的要求。     

偶联剂FS-79在阻燃钢丝绳芯输送带粘合胶中的应用

研究偶联剂FS-79在阻燃钢丝绳芯输送带粘合胶中的应用.结果表明:在阻燃钢丝绳芯输送带粘合胶中加入适量的偶联剂FS-79,胶料硫化特性变化不大,物理性能略有改善.粘合性能明显提高,成品输送带各项性能满足MT 668-2008标准要求.     

矿用整芯阻燃带挤出法生产工艺的优点

随着煤矿装备水平的不断提高,煤矿运输向高能量、连续化方向发展。胶带输送机在煤矿得到越来越广泛的应用。目前,我国煤矿井下用阻燃抗静电输送带有煤矿用织物整芯阻燃输送带、煤矿用阻燃钢丝绳芯输送带、煤矿用阻燃钢丝绳牵引带、煤矿用织物叠层阻燃输送带等几种类型。其物理机械性能、使用性能均能满足相关产品标准的煤矿安全生产的要求。     

粘合树脂在阻燃钢丝绳芯输送带胶料中的应用

研究粘合树脂在阻燃钢丝绳芯输送带胶料中的应用。结果表明：加入粘合树脂后,钢丝绳芯胶的焦烧时间和胶料在钢丝绳中的渗透时间延长,胶料粘合强度保持率更高,输送带安全性提高;静态粘合强度与橡胶基体的强度有关,动态粘合强度为橡胶-钢丝绳粘合层破坏强度,可以更准确地反映粘合树脂与钴盐并用的增粘效果;在阻燃钢丝绳芯输送带芯胶中应用粘合树脂HT1005效果更优。     

煤矿用阻燃钢丝绳芯输送带粘合胶的研制

介绍煤矿用阻燃钢丝绳芯输送带粘合胶的配方研制。煤矿用阻燃钢丝绳芯输送带粘合胶优化配方为：氯丁橡胶70,顺丁橡胶30,氧化锌5,氧化镁4,硬脂酸1,防老剂2．5,炭黑30,阻燃剂50,硫黄1．0,促进剂1．5,增塑剂5。采用该粘合胶生产的输送带产品达到《煤矿用阻燃钢丝绳芯输送带技术条件》标准的要求。     

煤矿用芳纶绳芯阻燃输送带的研制

芳纶纤维的强度为同等质量钢铁的5倍,但密度仅为钢铁的1/5.为实现节能降耗,开发了芳纶绳芯代替钢丝绳芯阻燃输送带.结果表明,在输送带强度一致的情况下,使用芳纶绳芯代替钢丝绳芯生产的输送带重量下降了30％左右,同时产品性能满足MT668-2008标准要求.     

煤矿用钢丝绳芯智能阻燃输送带的研制

以氯丁橡胶、顺丁橡胶和天然橡胶为基材,通过在钢丝绳芯阻燃输送带中植入智能RFID电子芯片,研制出了一种无源且内嵌的钢丝绳芯智能输送带.结果表明,该输送带具有全球唯一性、可自动识别性和信息可读取性,实现了煤矿用钢丝绳芯输送带生命周期内的跟踪、识别和智能化管理.     

NR／SBR／BR阻燃抗静电胶料的研制

以NR／SBR／BR为基体材料设计阻燃抗静电胶料,研究该胶料的阻燃抗静电性能、物理机械性能和加工性能等。结果表明,NR／SBR／BR的比例为30／50／20时,并用胶的物理机械性能和安全性能较好;氯化石蜡70#、氧化锑、“克火星”防火剂、高效阻燃润滑剂MB—202和硼酸锌等对燃烧性能均有影响,而对滚筒摩擦指标影响最大的是MB—202。该胶料用作生产煤矿用阻燃钢丝绳芯输送带的覆盖胶,产品的各项性能达到MT668-1997标准的要求。     

煤矿用阻燃钢丝绳芯输送带的研制

介绍了煤矿用阻燃钢丝绳芯输送带的研制。主要包括骨架材料的选择、覆盖胶和粘合胶配方的设计以及实际生产工艺。经试验测试产品性能符合MT668-1997（煤矿用阻燃钢丝绳芯输送带技术条件》标准。     

Preparation and properties of poly(Nε,Nε-dicarboxymethyl-l-lysine)

A new ampholytic homopolypeptide, $\text{poly}\text{(N}{}^{\mathrm{\epsilon }}\text{,N}{}^{\mathrm{\epsilon }}\text{-}\text{dicarboxy-methyl-}\text{l}\text{-lysine}\text{)}$, which has one tertiary amino and two carboxyl groups in the side chain has been derived from a hydrochloride salt of poly(L-lysine). The polymer in aqueous solution seems to be in the coil form with locally extended structure (LES) at neutral pH. In both the acidic and alkaline regions, the molar ellipticity of the polymer changes as a result of change in net charge on the side chain. The conformational changes may be from the coil with LES to other coiled forms. 5–7 M NaClO₄ and 80% aqueous methanol induce the α-helix in the polymer at neutral pH. Divalent cations, Cu²⁺ and Ca²⁺, do not induce any remarkably ordered structures such as α-helix or β-structure in the polymer in aqueous solution at any pH. Ultraviolet absorption studies show an absorption peak of the polymer-Cu²⁺ complex near 240 nm. Dependence of the peak intensity on pH at various q values ($\text{q =}\text{[}\text{Cu}{}^{\mathrm{2+}}\text{]}\text{[}\text{residue}\text{]}$) indicates the two steps of the complex formation. At q less than 0.64, the formation is described only with the first step. An average coordination number for Cu²⁺ at the first step was calculated to be about 2 by the method of Mandel and Leyte. The association constant of Cu²⁺ with the residue at the step was determined from the absorption data to be far smaller than that for the Cu²⁺-EDTA complex. The second step of the formation occurs in the case of large q but the absorption data for the second step cannot be obtained exactly due to precipitation.     

Wet Milling of Fe/Al/Al2O3 and Fe2O3/Al/Al2O3 Powder Mixtures

Wet milling of Al₂O₃-aluminide alloy (3A) precursor powders in acetone has been investigated by milling Fe/Al/Al₂O₃ and Fe₂O₃/Al/Al₂O₃ powder mixtures. The influence of the milling process on the physical and chemical properties of the milled powders has been studied. Particle refinement and homogenization were found not to play a dominant role, whereas plastic deformation of the metal particles leads to the formation of dislocations and a highly disarranged polycrystalline structure. Although no chemical reactions among the powder components in Fe₂O₃/Al/Al₂O₃ powder mixtures were observed, the formation of a nanocrystalline, ordered intermetallic FeAl phase in Fe/Al/Al₂O₃ powder mixtures caused by mechanical alloying was detected. Chemical reactions of Fe and Al particle surfaces with the atmosphere and the milling media lead to the formation of highly porous hydroxides on the particle surfaces. Hence the specific surface area of the powders increases, while the powder density decreases during milling. The fraction of Fe oxidized during milling was determined to be 0.13. The fraction of Al oxidized during milling strongly depends on the metal content of the powder mixture. It ranges between 0.4 and 0.8.     

Participation of lewis base on vinyl chloride polymerization with Al(C2H5)3CCl4 catalyst system

The polymerization of vinyl chloride has been investigated using an $\text{Al}\text{(}\text{C}{}_2\text{H}{}_5\text{)}{}_3\text{CCl}{}_4$ catalyst system in the presence of various Lewis bases. Effective Lewis bases are γ-butyrolactone, diglyme and diethylenetriamine which are multidentate. The rate of polymerization is dependent not only on the basicity of the Lewis base used but also on a coordination number of one. The latter is the predominant factor. For the effect of polymeric amines, a tentative hypothesis is discussed.     

Sintering of Si3N4-Y2O3-Al2O3

Sintering kinetics of the system Si₃N4-Y2O₃-Al₂O3 were determined from measurements of the linear shrinkage of pressed disks sintered isothermally at 1500° to 1700°C. Amorphous and crystalline Si₃N₄ were studied with additions of 4 to 17 wt% Y₂O₃ and 4 wt% A1₂O₃. Sintering occurs by a liquid-phase mechanism in which the kinetics exhibit the three stages predicted by Kingery's model. However, the rates during the second stage of the process are higher for all compositions than predicted by the model. X-ray data show the presence of several transient phases which, with sufficient heating, disappear leaving mixtures of β ' -Si₃N₄ and glass or β '-Si₃N₄, α '-Si₃N₄, and glass. The compositions and amounts of the residual glassy phases are estimated.     

Synthesis and Characterization of Ti0.33Ta0.33Nb0.33C and Ti0.33Ta0.33Nb0.33CxN1-x Whiskers

Ta_0.33Ti_0.33Nb_0.33C and Ta_0.33Ti_0.33Nb_0.33C _x N_{1− x} whiskers were synthesized via a carbothermal vapor-liquid-solid growth mechanism in the temperature range 900°-1450°C in Ar or N₂. The optimum temperature was 1250°C. Whiskers were obtained in a yield of 70-90 vol%. The whiskers were 0.5–1 µm in diameter and 10–30 µm in length. The starting materials that produced the highest whisker yield were: TiO₂, Ta₂O₅, Nb₂O₅, C, Ni, and NaCl. C was added to reduce the oxides, and Ni to catalyze whisker growth. NaCl was used as a source of Cl for vapor-phase transportation of Ta and Nb oxochlorides and Ti chlorides to the catalyst. The catalyst metal was recycled several times during the synthesis and was transported as NiCl₂( g ) according to thermodynamic calculations. The rate of formation and the chemical composition of the whiskers depended on the synthesis temperature, the choice of catalyst, and the atmosphere. At low temperatures, the whiskers were enriched in Nb and Ta, whereas the Ti content increased with increased synthesis temperature.