用毛细管粘度计测定易沉降固液悬浮体的粘度

测定固液悬浮体粘度时,流体进入毛细管前应有良好的搅拌,但它将引起入口端额外的端效应.本文引入了一个惯性校正项,可以有效地解决搅拌下毛细管粘度计的标定及固液悬浮体粘度的测量问题.根据上述标定结果用毛细管粘度计对氨性溶液与镍红土矿配成的矿浆进行了粘度测定.实验表明,固体粒子体积浓度较低时,该流体近似牛顿流体,其粘度与体积浓度的关系可用Vand方程式表示,即μ/μ_0=exp(bc_V).     

聚氯乙烯用自动粘度计

日本旭工程公司研制了一种粘度测定自动化,测定时间大幅度缩短,测定数据可靠性高的(毛细管式)自动粘度计。该种FAV—P型自动粘度计,除粘度管、起始温调方式、冲洗方式改进和测定时间缩短外,测定方式自动化,而且一台装置可同时测定数种粘度,测定准确度高。该种自动粘度计可用于聚氯乙烯、聚丙烯、聚     

大豆蛋白/聚丙烯酰胺复合膜的性能研究

制备浓度6%的聚丙烯酰胺与大豆蛋白浆液,研究聚丙烯酰胺含量对浆液的粘度、pH值、粘附力以及浆膜断裂强度、断裂伸长率、耐磨性、吸湿性和水溶性的影响。结果表明,随着聚丙烯酰胺含量的增加,浆液的粘度与粘附力不断增大,pH值降低,浆膜耐磨性变化不大,水溶性有所降低,断裂强度先增大后减小,断裂伸长率则先减小后增大。在聚丙烯酰胺含量40%时,断裂强度为32.374 N,断裂伸长率为23.065%,吸湿率为20.53%,浆膜柔韧性和吸湿性得到显著改善,可以应用于经纱上浆。     

大豆蛋白/聚丙烯酰胺复合膜的性能研究

制备浓度6%的聚丙烯酰胺与大豆蛋白浆液,研究聚丙烯酰胺含量对浆液的粘度、pH值、粘附力以及浆膜断裂强度、断裂伸长率、耐磨性、吸湿性和水溶性的影响。结果表明,随着聚丙烯酰胺含量的增加,浆液的粘度与粘附力不断增大,pH值降低,浆膜耐磨性变化不大,水溶性有所降低,断裂强度先增大后减小,断裂伸长率则先减小后增大。在聚丙烯酰胺含量40%时,断裂强度为32.374 N,断裂伸长率为23.065%,吸湿率为20.53%,浆膜柔韧性和吸湿性得到显著改善,可以应用于经纱上浆。     

漫话橡胶测试仪器设备（三）

三、橡胶门尼粘度计橡胶门尼粘度计主要用来测定生胶或混炼胶门尼粘度以及胶料的焦烧时间和硫化速度。所谓门尼粘度即用门尼粘度计测得的生胶或混炼胶的粘度,也就是在一定的温度、时间、压力下,被测胶样对门尼粘度计转子的转动所产生剪切力矩的大小。由于胶料的塑性不同,转子所承受的剪切力矩的大小也不同。这表现在显示装置上的数值越大,即门尼值越大,门尼粘度越高,也就是塑性越低。以门尼粘度计测定的门尼焦烧则是以时间表示混炼胶初期硫化特征的。它是根据被测胶样门尼粘度的变化,来测定在一定温度下开始出现硫化现象的时间,其转…     

用熔体的零切粘度和熔融指数研究聚丙烯的分子量分布

本文采用自制落球粘度计测定了用高效催化剂和化学降解两种方法生产的常用纤维级聚丙烯的零切粘度η_0,并与熔融指数仪测得的熔融指数MI值相结合求得聚丙烯分子量分布指数α值。研究表明,本法测得的η_0与熔体流变仪测得的η_0基本相符。本文还探讨了影响η_0测试的诸因素,在正确操作情况下,测试误差可小于5%。本仪器简单、价廉,在聚丙烯生产厂可推广使用作为指导生产工艺的依据。     

胶粘剂粘度测定方法(旋转粘度计法)

1 适用范围本标准适用于胶粘剂绝对粘度的测定。 2 定义粘度是流体的内摩擦,是一层流体与另一层流体作相对运动的阻力,以厘泊表示。 3 仪器设备 3.1 旋转粘度计:测量误差小于±0.5％。 3.2 超级恒温槽:温度波动范围小于±0.5℃。     

NDJ-1型旋转式粘度计试测小结

NDJ-1型旋转式粘度计是用于测量液体的粘性阻力与液体的绝对粘度的新型仪器.广泛适用于测定油脂、油漆、塑料、食品、药物、胶粘剂等各种流体的粘度.我们用它来测定泥浆粘度和厚化度的.仪器的主要技术指标:测定范围:中粘度:10-100000厘泊     

介绍一种改进的称球法粘度计

一、概述粘度是玻璃的一个重要工艺性质.它影响着玻璃的熔制、均化、成型等工艺过程.玻璃粘度值随组成和温度而变.在生产和科研中经常需要测定玻璃的粘度——温度曲线,研究组成对粘度变化的影响.测定玻璃熔体粘度的仪器已有多种.平衡称球法(又称落球法)粘度计的测定范围为10~0～10~4泊~((1.2)).转球法粘度计测定范围为1×10~(-1)～5×10~4泊~((3)(4)).通用粘度计     

煤沥青粘度测定方法的探讨

1前言现阶段，用于测定试样粘度的方法较多，如用思氏粘度计测定液体试样粘度，但此方法仅能测定低温度下液体试样的粘度值；而用于测定高软化点沥青的方法还不多。虽然有些单位能测定此项目，一般采用日产全自动、高精度的YZ—丙—207—2型粘度计测定煤沥青粘度，但此仪器价格     

Three phase flow of gasndashcoal slurry mixtures in vertical tubes

The pressure drop and liquid and slurry phase holdups of a cocurrent flow of gasNdashoil and gasNdashcoalNdashoil slurry mixture in cylindrical columns (1.85 and 2.85 cm-ID) were investigated. The effect of viscosity (43.1-315 cp) was determined using solutions of two different mineral oils and of four different concentrations of coalNdashoil mixtures. The liquid and slurry holdups increased with liquid flowrate and liquid viscosity and decreased with gas flow rate. For solid concentrations in the range 0-35 wt% with the size of coal employed (0.07-0.16 mm) the slurry behaved like a homogeneous Newtonian fluid. The data for frictional pressure drop and phase holdups were correlated in terms of the ratio of fluid velocity, and the Reynolds and Weber numbers of the liquid and slurry phases.     

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

As a preliminary study for the gasification of an anthracite and petroleum coke mixture, viscosity was measured at various temperatures (20–50 °C), slurry concentrations (60–70 wt%) and additive amounts (0–0.8 wt%) by using an LV-II type viscometer. In addition, four types of different additives, sodium naphthalene sulfonate, poly(methyl methacrylate), polypropylene and a polypropylene glycol based additive, were applied to Korean anthracite, petroleum coke and mixtures of these materials, and the viscosity data were compared. Viscosity dependency values for coal, anthracite, bituminous and sub-bituminous coal, were compared, and it was found that a high content of moisture and particularly ash increases CWS viscosity. The four types of additives tested in this research can effectively diminish the viscosity of coal and especially petroleum coke-water slurry by more than 70% to 95%, respectively. Moreover, the sodium naphthalene sulfonate-based additive reduced the viscosity of coal and petroleum coke-water slurry best, especially at concentrations in excess of 65 wt%. Based on these results, highly loaded slurry created by mixing anthracite and petroleum coke with additives was achieved.     

Effects of fibre length and mixing routes on fibre reinforced shell for investment casting

Shell for investment casting is key in obtaining casting with high performances. In this study, carbon fibres were mixed with slurry, silica sol, and sanding materials to prepare fibre reinforced shell for investment casting. Suspension properties, slurry viscosity, and shell strength were all investigated. Failure surface of shell was observed by scanning electron microscopy (SEM). Results indicated that suspension percentage and viscosity of slurry containing fibre and silica sol were higher than those of fibre free slurry. The viscosity of slurry increased as carbon fibre length rose. Comparison of different mixing methods and fibre lengths revealed that addition of carbon fibre with 4?mm in length into silica sol under ultrasonic agitation yielded maximum bending strength of 3.97?MPa. SEM data illustrated that the longer fibres might increase bonding area, leading to increased shell strength.     

Fabrication by three‐phase emulsification of pellicular adsorbents customised for liquid fluidised bed adsorption of bioproducts

A novel dense pellicular adsorbent, custom‐designed for liquid fluidised bed adsorption of protein bioproducts, has been fabricated by coating zirconia–silica particles with agarose gel in a three‐phase emulsification process. A slurry feedstock comprising solid zirconia–silica particles (120 µm average diameter) suspended in an aqueous solution of agarose was emulsified in an oil–surfactant mixture in a stirred vessel to yield composite droplets. These were subsequently stabilised by cooling to form spherical pellicular particles characterised by a porous, pellicular coat cast upon a solid core. The impact of agitation speed, surfactant concentration, oil viscosity and slurry composition upon the pellicle depth and overall particle diameter was investigated. Pellicle depth decreased with increasing impeller speed and decreased oil viscosity, whilst increased slurry viscosity enhanced that parameter. Initial increases from low concentrations of Span 80 surfactant (0.1% w/v oil) reduced the depth of the agarose pellicle, but the highest values investigated (1.5% w/v oil) promoted particle aggregation. The fluidisation behaviour of particles fabricated under various conditions was characterised by the measurement of expansion coefficients and axial dispersion coefficients for the liquid phase when operated in a standard fluidised bed contactor. Both parameters were found to be comparable or superior to those reported for conventional, composite fluidised bed adsorbents. The controlled coating of porous agarose upon a solid core to yield specific pellicular geometries is discussed in the context of the fabrication of adsorbents customised for the recovery of a variety of bioproducts (macromolecules, nanoparticulates) from complex particulate feedstocks (whole broths, cell disruptates and unclarified bio‐extracts). Given the agreement between the size of the pellicular particles and the trends expected from theory, the large‐scale manufacture of such particles for customised industrial use is recommended. Copyright © 2003 Society of Chemical Industry     

铁黄合成体系流变特性

针对碱法铁黄制备过程,研究了体系的流变特性．在反应初期铁黄合成体系粘度较小,随反应进行体系粘度显著增大,在反应中后期反应液为满足幂指数规律的假塑性流体,并具有很强的剪切稀化行为．反应温度、碱比、搅拌转速和通气量等通过改变粒子的生成过程和粒子的形态来改变铁黄合成体系的流变特征．在铁黄合成体系中加人硅酸纳会使体系粘度显著下降,流变特性随之发生变化．     

Flow behavior of wakes in a three-phase slurry bubble column with viscous liquid medium

Flow behavior of wakes has been investigated in a three-phase slurry bubble column of 0.102 m ID and 1.5 m in height. The dependence of wake characteristics such as rising velocity, frequency, holdup and equivalent size on the operating variables was examined by employing an electric resistivity probe method. The gas velocity, liquid viscosity and solid content in the slurry phase were chosen as independent parameters. The rising velocity of wake region increased with an increase in the gas velocity (4.0–12.0 cm/s), liquid viscosity (1.0–50.0 mPa·s) or solid content (0–25 wt%) in the slurry phase. The frequency and holdup of wake phase increased with increasing gas velocity, but decreased with increasing liquid viscosity or solid content in the slurry phase. The equivalent size of wake phase increased with increasing gas velocity, liquid viscosity or solid content in the slurry phase. The wake properties and holdup were well correlated with operation variables within these experimental conditions.     

Particle dispersion in viscous three-phase inverse fluidized beds

Dispersion characteristics of low density fluidized particles such as polyethylene and polypropylene were investigated by using the stochastic method in three-phase inverse fluidized beds with viscous liquid medium ( in height). To establish the relationship between the pressure drop variation and the particle dispersion in test section, the histogram of pressure drop fluctuations were also measured and analyzed. Effects of operating variables such as gas and liquid velocities, liquid viscosity and media particle kind (density) on the fluctuating frequency, dispersion coefficient and exiting rate of media particles from the test section were determined. The fluctuating frequency and dispersion coefficient of particles increased with increasing gas or liquid velocity, but decreased considerably with increasing liquid viscosity in three-phase inverse fluidized beds. The dispersion coefficient of media particles of relatively higher density exhibited a value higher than that of lower density particles. The dispersion coefficients of particles were well correlated with operating variables in terms of dimensionless groups.     

Some features of the flow of a polypropylene melt in the formation of fibres

Conclusions 1. On passing through a spinneret orifice, a polypropylene melt behaves as a structured pseudoplastic liquid and its properties are described by flow laws analogous to the flow laws in a capillary viscometer.2. The dependence of the effective viscosity of a polypropylene melt on its molecular weight, temperature, and shear stress has been established in the form of a semiempirical equation.3. The effective viscosities of a polypropylene melt on flow through spinneret orifices in the formation of a fibre have been determined. It has been shown that a change in the effective viscosity does not affect the properties of the fibre.(VNIIV) All-Union Scientific Research Institute for Synthetic Fibres. Translated from Khimicheskie Volokna, No. 2, pp. 14–16, March–April, 1969.     

聚丙烯浆液浓度的测定及其影响因素的探讨

论述了通过双法兰差压变送器测定聚丙烯浆液密度，从而求和合反应釜中浆液浓度的方法，并进一步论了浆液浓度与平均停留时间，料位和聚合量等工艺参数之间的关系。