工业评述2001～2002年国外塑料工业进展

收集了2001年7月到2002年6月有关国外塑料工业的相关期刊资料,介绍了2001年到2002年国外塑料工业的发展情况,提供了世界各地域塑料原材料的产量及构成比,日本、美国、加拿大、德国、法国、比利时、墨西哥、芬兰、西班牙等国家的树脂产量、消费量及增长率,以及日本、西欧、北美等地区的不同品种塑料原料消费量和增长率统计.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、通用热固性树脂(酚醛、聚氨酯、不饱和树脂、环氧树脂)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)不同品种的顺序,对树脂的产量、消费量及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等有关技术作了详细的介绍.     

2006～2007年世界塑料工业进展

收集了2006年7月～2007年6月世界塑料工业的相关资料,介绍了2006～2007年世界塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

1998～1999年国外塑料工业进展

收集了 1998年 7月到 1999年 6月国外塑料工业相关期刊资料 ,介绍了 1998～ 1999年国外塑料工业进展。提供了日本、美国、加拿大、德国、法国、比利时、意大利、英国、西班牙、匈牙利、马来西亚等国通用热塑性树脂、工程塑料、通用热固性树脂、特种工程塑料的产量和增长率 ,提供了美国、日本、德国、韩国、法国、比利时、荷兰、意大利和其他国家以及亚洲、欧洲、北美洲、中南美洲、非洲和大洋洲等地域的树脂产量及构成比 ,此外还提供了中国台湾的树脂产量。按通用热塑性塑料、通用热固性塑料、通用工程塑料和特种工程塑料分类 ,对其合成工艺、树脂品种延伸、新的应用开发等工业技术作了详尽的介绍     

国内外丁基橡胶生产现状及市场前景

丁基橡胶()是世界上第四大合成橡胶(SR)IIR胶种,是异丁烯和异戊二烯在Friedel-Craft催化剂作用下进行阳离子聚合反应的产物。由于丁基橡胶具有优良的气密性和良好的耐热、耐老化、耐臭氧、耐溶剂、电绝缘、减震及低吸水等性能,使得其在内胎、水胎、硫化胶囊、气密层、胎侧、电线电缆、防水建材、减震材料、药用瓶塞、食品(口香糖基料)、橡胶水坝、防毒用具、粘合剂、内胎气门芯、防腐蚀制品、码头护舷、桥梁支撑垫以及耐热运输带等方面具有广泛的应用。一、世界丁基橡胶生产现状及市场前景1.生产现状目前,世界上只有美国、德国、俄罗斯、…     

树脂基复合材料成型工艺研究进展

主要综述了树脂基复合材料的几种成型工艺,包括RTM、VARTM、CRTM、LRTM、RFI、VARI、SCRIMP、SRIM、TERM,各自的发展现状、成型原理、特点等.     

沁阳市沁龙化学防腐有限公司

<正>河南省沁阳市沁龙化学防腐有限公司是从事研制生产多功能新型螺旋溜槽、摇床、旋流分级机、磁选机、浮选机、搅拌槽、打砂机、玻璃钢冷却塔、风机、管道、防腐贮罐等多种产品的专业公司,已有近三十年的生产历史,通过了ISO9001:2000质量体系认证。主导产品为多功能新型螺旋溜槽、摇床,是选别有色金属、黑色金属、非金属、贵重金属的理想选矿设备,如金矿、银矿、沙金矿、锡矿、钛铁矿、硫铁矿、赤铁矿、褐铁矿、铬铁矿、钨矿、钽泥矿、煤矿、独居石、蓝宝石、重晶石、金红石、锆英石、硅砂等。现有8000多台设备在全国各地矿山使用。在鞍钢、马钢、首钢、包钢、唐钢、安钢、武钢、柳     

业态分散 规模偏小 品牌难提升 生意冷清 竞争激烈 商家难支撑——商丘 亳州 阜阳泛家居行业经销商调查报告

10月27日-11月20日,笔者一行4人对河南商丘、安徽毫州、阜阳3个市的市区和郊区泛家居行业进行了普查,共走访调查经销商1250多家,走访各种规模的建材城、建材街、家具市场、装饰建材市场10个,填写《全国泛家居行业经销商普查表》1200多份,调查涵盖陶瓷、卫浴、家具、橱柜、衣柜、厨房电器、五金锁具、楼梯、门窗、地板、涂料、淋浴房、家装、红木、木雕、吊顶、竹家居、石材、管材、建材、水暖、太阳能、灯饰LED、饰品、地毯、木制品、铁艺、布艺、墙纸、家纺、晾衣架、背景墙、隐形纱窗等30多个泛家居细分行业。     

浅谈化学品仓库火灾的扑救

化学品仓库集中存放着许多化工产品，这些产品性质复杂，多数有易爆、易燃、有毒、有腐蚀性的特点，扑救这类化学品的火灾是一项比较复杂的工作。如不能用水（包括水蒸气和含水的泡沫剂）扑救的化学品就有金属钠、钾、钙、镁、钍、铝粉、铝镁合金、氰化钠、硼氢化物、电石、磷化钙、发烟硫酸、氯磺酸、三氯化磷、五氯化二磷、无水氯化铝、过氧化钠、氯化硫酰、四氯化硅、五氨化锑、氯乙酰、苯基氯硅烷等忌水物质。     

秦皇岛玻璃工业研究设计院矿山所为您提供

正硅砂、砂岩、长石、白云石、石灰石等玻璃原料的实验室及半要业试验硅砂、砂岩、长石、白云石、石灰石等玻璃原料的采矿、选矿设计和工程总承包硅砂、砂岩、长石、白云石、石灰石矿的技术改造及技术咨询     

传统手工艺的当代价值

自然界,为人类提供了生存、生活,以及进行创造的物质基础。人们在自然界的劳动实践中,获取了竹、木、柳、藤、草、棉、革、漆、土、玉、石、陶、瓷、金、银、铜、铁、锡等成为生活用品的材料。随着造物活动的扩大,人们也创造了与这些材质相适应的雕、镂、刻、削、染、缝、绘、髹、铸、琢、磨等工艺。     

迷宫密封压缩机连杆结构有限元分析

以ZW-30/11.27型迷宫密封压缩机的连杆为研究对象,利用三维有限元法在压缩机连杆的受拉、受压两种状态下进行了有限元结构力学分析,并得到连杆应力的计算结果,为连杆的设计制造提供了理论依据。     

Effect of the density of the electronic states at the valence orbital of the bridge redox molecule on the dependence of the tunnel current on the overvoltage in the case of fully adiabatic electron transition

Effect of the density of the electronic states at the valence orbital of the bridge redox molecule on the dependence of the tunnel current on the overvoltage and on the width at half maximum of the current-overvoltage curve is studied. A number of the approximate expressions for the density of states, the tunnel current and the width are obtained in the fully adiabatic limit for different particular cases. It is shown that at small values of the coupling of the electronic levels of the electrodes with the valence orbital of the redox molecule and the small values of the bias voltage two regions of the reorganization Gibbs energy exist with different dependence of the width on the reorganization Gibbs energy. The results of calculations of the density of states, the tunnel current and the width are presented and used for the interpretation of the experimental data [N.G. Tao, Phys. Rev. Lett. 76 (1996) 4066, I. Visoly-Fisher, K. Daie, Y. Terazono, C. Herrero, F. Fungo, L. Otero, E. Durantini, J.J. Silber, L. Sereno, D. Gust, T.A. Moore, A.L. Moore, S.M. Lindsay, PNAS 103 (2006) 8686].     

丙交酯制备过程中几种影响因素的研究

以L-乳酸为原料在催化剂存在的条件下,加热脱水、裂解合成了L-丙交酯。研究了脱水温度、脱水时间、裂化反应温度及催化剂种类对丙交酯产率的影响。通过正交实验确定的最优反应条件为:脱水温度120℃、脱水时间4h、裂化温度240℃、催化剂为辛酸亚锡,并通过工艺的改进,大幅提高了丙交酯的产率,达到56.9%。     

Determination of the Equilibrium Composition of the Product Mixture in the Reaction of Oxidizing Ammonolysis of Methane

Application of the advanced Hook‐Jeeves method for the solution of systems of nonlinear equations has led to determination of the equilibrium composition of the product mixture formed in the reaction of oxidizing ammonolysis of methane (OAM). It is shown that the composition crucially depends on the number of the considered parallel and sequential reactions. It is established that no thermodynamic restrictions exist both for the formation of formic acid in the course of the OAM reaction and for the subsequent conversion of formic acid to hydrogen cyanide.     

Evaluation of the ratio of the evaporation energy to the activation energy for estimating the thermodiffusion coefficient

Thermodiffusion has an important role in displacements of hydrocarbon reservoir. The ratio of the evaporation energy to the activation energy of viscous flow in pure limits, τ_pure,k, is of a great importance in estimating the thermodiffusion coefficient for non‐associating fluid mixtures. Several methods may be used to estimate τ_pure,k which causes different values for thermodiffusion coefficients. A fixed value for τ_pure,k was considered to predict the thermodiffusion coefficient. In this paper, Abbasi et al.'s [J. Non‐Equilib. Thermodyn. 2010;35:1–14] model and Shukla and Firoozabadi's model have been applied to predict thermodiffusion coefficients for linear chain hydrocarbon binary mixtures. The results show a very good performance of the simple approach in respect to the previous models in estimating thermodiffusion coefficients. © 2011 Canadian Society for Chemical Engineering     

Experimental study of the influences of the pellet shape on the bulk density and the frictional behavior of polypropylene

Bulk solids are the raw material for almost every polymeric thermoplastic product. Their properties determine the quality of solids conveying and also influence the melting behavior of the material in processing units. This study investigates the influence of pressure and temperature on the bulk density of two thermoplastic polypropylene pellets of different shapes. Furthermore, the external friction dependent on temperature and pressure of those materials is examined at conditions usually occurring in the solids conveying zone of smooth barrel plasticating units. The experiments are carried out using a tribometer for polymer pellets which was adapted for these tests by making the sample chamber, the piston, and the cylindrical roll heatable. The tests show that long cylindrical pellets exhibit low bulk densities at low pressure and temperature, which can be increased dramatically—even above the values of spheroidal pellets—as those parameters increase. Moreover, the external coefficient of friction is always higher for the long cylinders and strongly dependent on the temperature. Those facts add up and can cause a higher output of single‐screw extruders. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42197.     

On the effect of the nature of the side chain over the crystalline structure in aliphatic polyketones

The crystalline structure of a number of random polymers of perfectly alternating l-olefins/carbon monoxide aliphatic polyketones has been studied by wide angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), differential scanning calorimetry (DSC) and Raman spectroscopy. From previous studies, WAXS, Raman and DSC have shown to be suitable techniques for the characterisation of the two crystalline polymorphs, α (denser) and β, detected in ethene/carbon monoxide (ECO) and in ethene/propene/carbon monoxide (EPCO) polymers. In this paper for the first time, polyketones with butene and hexene as the second olefin are reported. It was found that the ethene/propene/carbon monoxide polymers and ethene/butene/carbon monoxide (EBCO) polymers, predominately contain the β-rich crystalline phase. The crystalline density of this phase drops with increasing second olefin content, albeit at a faster pace for propene polymers. From the latter results, and from the behaviour of the melting point, crystallinity, and crystal thickness across composition, inclusion of methyl and ethyl side chains into the crystals as defects was inferred. Ethene/hexene/carbon monoxide (EHCO) polymers do seem to behave differently: they show lower crystallinity, the presence of a larger quantity of the denser α crystals and a relatively high and constant crystalline density for the β phase throughout composition; observations that unambiguously support the exclusion argument for the butyl branches. The above behaviour is surprising since for instance in polyethylene copolymers it is considered that only methyl branches can enter the crystal lattice. The relative presence of α crystals was found to decrease with increasing the concentration of branches and in the order EHCO>EBCO>EPCO.     

Study of the effects of heat removal on the copying accuracy of the electrochemical machining process

The ECM process with a moving cathode tool is simulated with the aim to study the influence of the temperature on the uniformity or copying quality of the removal rate. Two temperature dependent electrode reaction models are presented and used for solving the charge conservation and internal energy balance equations, in combination with the Navier–Stokes equations for viscous incompressible flow. The level set method is used for tracking the anode interface. The heat conduction through electrodes and the heat production by the electrode reactions are found to play an important role.     

Reducing the effect of impurity content of the caustic on the viscosity of viscose

Conclusions Reducing fluctuations in impurity concentration in the caustic to low-frequency disturbances makes it possible to reduce their effect on the viscosity of viscose.To reduce fluctuations in impurity concentration to a low frequency, it is necessary to introduce continuous schemes for the preparation of alkali with automatic regulation or separate systems for preparation with periodic make-up of one tank which constantly stands ready for delivery and which performs the role of a filter.Translated from Khimicheskie Volokna, No. 2, pp. 27–28, March–April, 1990.     

Statistical analysis of the strength reliability of the MAX phases

A good comprehension of the mechanical property stability is crucial in promoting the structural applications of the MAX phases. This study aims to determine the most suitable intensity distribution for the experimental flexural strength of present Ti₃AlC₂ and previous Ti₃SiC₂, optimize the fitting parameters, and explore the error sources. After comparing two-parameter Weibull, three-parameter (3P) Weibull, and other three distributions, the 3P-Weibull distribution is the most suitable for the MAX phases. The different parameter estimation methods, rank estimators, and minimum used sample numbers of 3P-Weibull were tested to determine safe and accurate parameter values for engineering application. Furthermore, the 3P-Weibull modulus (2.32 for Ti₃AlC₂ and 2.04 for Ti₃SiC₂) indicates that the MAX phases occupy a middle ground between typical metals and ceramics, attributing to their high fracture toughness and the R-curve behavior. These findings would open up prospects for the standardization of testing methods for the Weibull statistics of the MAX phases.