80%碱式硫酸铜水分散粒剂的配方研究

主要研究了润湿剂、分散剂、崩解剂和填料等因素对碱式硫酸铜80%水分散粒剂性能的影响,确定了碱式硫酸铜水分散粒剂的配方组成:碱式硫酸铜80%、Morwet EFW 3%、Morwet D-425 5%、T/36 3%、羧甲基淀粉钠3%,白炭黑补足至100%。经过试验分析表明,产品悬浮率达到90%以上,崩解时间小于1 min,热贮[(54±2)℃]分解率小于5%,产品各项指标符合水分散粒剂的要求。     

50%烯酰吗啉水分散颗粒剂配方研究

通过对润湿分散剂、崩解剂等助剂进行筛选,确定了50%烯酰吗啉水分散粒剂的配方.最佳配方为50%烯酰吗啉,润湿剂K12和FLA-1分别为1%和6%,分散剂为4%FLB-1,崩解剂为5%尿素,硫酸钠作为填料.结果表明:该产品分散良好,悬浮率大于90%,润湿时间小于60 S,崩解性能良好,热贮分解率小于5%,各项指标均符合水分散粒剂的要求.     

40%烯酰吗啉水分散粒剂的配方研究

通过对润湿分散剂、助崩解剂等助剂的筛选,确定了40%烯酰吗啉水分散粒剂的最佳配方为烯酰吗啉40%,萘磺酸盐分散剂6%,丁基萘磺酸钠2%,尿素5%,果糖0.3%,填料为高岭土。简述了该剂型的特点、配制方法及生产工艺,介绍了产品性能及其测定方法。研究结果表明,该产品分散性好,悬浮率大于90%,润湿时间小于30s,崩解时间小于1min,热贮分解率小于5%,各项指标均符合水分散粒剂的要求。     

几种聚羧酸盐分散剂在50%烯酰吗啉WDG中的应用评价

通过对润湿分散剂、助崩解剂等助剂的筛选,确定了50%烯酰吗啉水分散粒剂的最佳配方为烯酰吗啉50%,聚羧酸盐分散剂6%,十二烷基硫酸钠2%,硫酸铵3%,填料为高岭土。简述了该剂型的特点、配制方法及生产工艺,介绍了产品性能及其测定方法,并与进口助剂的性能进行了比较。研究结果表明,LG-03、GY-D1252和GY-D1256的分散性能良好,制成的水分散粒剂分散性好,悬浮率大于90%,润湿时间小于30 s,崩解良好,热贮分解率小于5%,SD-1401助剂分散性能不理想。     

50%醚菌酯水分散粒剂配方研究

通过对分散剂、湿润剂、崩解剂、粘着剂和填料等各种助剂的筛选,确定了50%醚菌酯水分散粒剂的最佳配方为:醚菌酯含量50%,分散剂(木质素磺酸钙 Morwet-450)20%,湿润剂Witconol NP-100 0.4%,崩解剂羧甲基淀粉钠5%,粘着剂NJ 1%,陶土补足到100%.最终得到的产品悬浮率高(大于90%),崩解时间短(小于20s),分散性和湿润性好,热贮稳定性合格,各项技术指标均超过了水分散粒剂的要求.     

80％戊唑醇水分散粒剂的研究

通过对分散剂、湿润剂、崩解剂和填料等各种助剂的筛选,确定了80％戊唑醇水分散粒剂的最佳配方:戊唑醇含量80％;分散剂:PO-EO嵌段聚醚5％;湿润剂:月桂醇聚氧乙烯基醚2％;崩解剂:羧甲基淀粉钠5％;高岭土补足.试验结果表明:该产品悬浮率90％以上,崩解时间小于30 s,热贮[(54±2)℃,14 d]分解率小于3％,产品各项指标符合水分散粒剂的要求.     

36%噻虫啉水分散粒剂的研制

用不同种类的分散剂、润湿剂、崩解剂、填料进行配方组合,制成制剂后检测其悬浮率、崩解性等指标,确定了36%噻虫啉水分散粒剂的制剂生产配方为噻虫啉36%,萘磺酸盐混合物10%,萘磺酸盐10%,硫酸铵20%,轻质钙33.2%.该配方制剂经热贮稳定性检测,有效成分分解率小于1.1%,悬浮率大于93.3%,润湿时间小于23 s,崩解性时间为33 s,达到水分散粒剂的产品标准要求.     

80%精噁·灭草松水分散粒剂的研究

采用旋转造粒工艺,对80%精噁·灭草松水分散粒剂的配方进行了研究。通过对润湿剂、分散剂、崩解剂及填料的筛选,确定了优化配方,并对产品性能进行了测定。产品悬浮率在90%以上,其他各项技术指标均符合水分散粒剂要求。     

松香衍生物分散剂的合成及应用

以苯乙烯磺酸钠（SSS）、丙烯酸（AA）、松香衍生物（MPAHEMA）为单体合成了一种新型共聚物分散剂.结果表明,当单体SSS,AA,MPAHEMA的摩尔比为1.0：3.5：0.2、引发剂的质量分数为单体总质量的8%、反应温度80 ℃、反应时间为2 h时,制得的分散剂对硫酸钡的分散效果最佳.此分散剂用于加工75%阿特拉津水分散粒剂（WG）,分散剂的最佳用量为6%,悬浮率可以达到90.8%,悬浮率和最大持留量均高于进口分散剂（T/36）制成的水分散粒剂.     

70%啶虫脒水分散性粒剂的配方研究

以97.9%啶虫脒为原药,氯化铵为崩解剂,润湿剂M为润湿剂,萘磺酸甲醛缩合物加ZX–D9为分散剂,膨润土为填料,对70%啶虫脒水分散性粒剂的配方进行研究,并确定了最佳配方。实验结果表明,产品悬浮率达到90%以上,崩解时间小于1min,热贮[(54±2)℃,2周]分解率小于2.5%,产品各项指标符合水分散粒剂的要求。     

Mesomorphic transitions in a mixture of a flexible and a semi-rigid polymer

Phase studies on a mixture of two polymers are presented, one of which is mesomorphic. We have systematically examined the influence of the molecular weight of the flexible polymer (including the oligomers) and of the semi-flexible polymer. In addition to the effect of the molecular weight, specific interactions are important for compatibility and formation of a homogeneous mesomorphic phase. The nature of this phase is demonstrated to be cholesteric and the pitch is determined.     

Electrolytes: From a Thorn Comes a Rose,and from a Rose,a Thorn

In this article we take a stroll through the metaphorical rose garden, part of the flower garden, that is electrochemical storage systems. We take a closer look at batteries as the center‐pieces – the roses – and especially at the system component of batteries, the electrolyte and its development, throughout history. Just as a rose can only develop its unique beauty when taken good care of and provided with clean water and suitable nutrients, a battery cell cannot function without its electrolyte; the seemingly trivial component that has to juggle a multitude of requirements in order to make batteries truly bloom.     

Extraction into a flow of a fluid with a velocity gradient

Unsteady extraction from a system of semi-infinite capillaries to the flow of a fluid with a linear velocity gradient is studied. An assumption that the diffusion in the flow is a quasi-steady-state process is taken to obtain a linear equation for the local mass flux from the pore space, which involves fractional derivatives with respect to time and flow coordinate. Limiting solutions for the total diffusion flux at small and large times that cover the entire time interval are found.     

Detonation of a Column of a Chemically Active Bubbly Medium in a Liquid

The problem of a detonation wave propagating in a cylindrical column of a chemically active bubbly medium screened by a liquid from the tube walls is formulated and numerically solved within the framework of the Iordanskii–Kogarko two-phase model with allowance for energy dissipation due to acoustic radiation of bubbles. The wave structure of the reaction zone and the detonation velocity of the bubbly medium column are calculated. It is found that the self-sustaining wave can propagate with a velocity greater than the velocity of one-dimensional bubble detonation by a factor of 1.5–2.5.     

Drag of a cylinder moving near a wall in a yield stress fluid

The drag of a cylindrical obstacle moving at a constant velocity in a yield stress fluid close to a wall is studied experimentally and numerically. The wall influence has been explored for gap values between the cylinder of diameter D and the wall ranging from 0.01D to 100D, which corresponds, respectively, to hydrodynamic lubrication and to unconfined domain conditions. A model yield stress fluid (Carbopol gel) is used in the experiments. The viscous and plastic drag coefficients have been calculated and measured as depending on the Oldroyd number, in conditions where the yield stress effects are more important than those of viscosity and the inertia negligible. We have performed experimental and numerical validations in the Newtonian case and provided more specifically comparisons of our measured data on yield stress materials with those resulting from viscoplastic flow simulations. © 2018 American Institute of Chemical Engineers AIChE J, 64: 4118–4130, 2018     

Propagation of a burning front over a condensed material from a focus

Measured propagation speeds are given for the combustion front in a blind gap in a condensed substance, which are related to gap height and mean pressure. The front may propagate monotonically, which is characteristic of relatively high pressures and wide gaps, or as a result of additional burning foci arising at a certain distance from the main front. At low pressures and particularly with small gap heights, the front propagates in an unstable fashion over the surface.Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 4, pp. 49–53, July–August, 1992.     

When is a Beam a Plate?

Formulas associated with simple beam or plate theories are used extensively in structural design, to determine You's modulus, and to determine fracture strength of brittle nonmetallic materials. The question may arise as to whether the proper ratio of beam-width-to-beam-depth is such that the bent structural element can be considered as a beam and, if not, what is the correction factor that should be used with the simple beam formula. These questions are answered for a range of structural metallic and brittle nonmetallic materials.     

Behaviour of a large bubble flowing through a sudden constriction between a cylindrical pipe and a rectangular cross section channel

The behaviour of a single large bubble flowing through a sudden constriction between a cylindrical pipe and a channel of rectangular cross section is studied experimentally. Two types of constrictions are considered: an abrupt one and a smooth one. Image analysis displays the deformation of the large bubble generated in the upstream vertical pipe and flowing through each kind of constriction. Image processing allows an estimate to be made of the velocity of Dumitrescu bubbles upstream of the constriction and the velocity of a 2D cap bubble flowing downstream of the constriction in a rectangular-cross-section channel. When the large bubble flows through a constriction, its behaviour can be considered in two steps: a first step corresponding to the disengagement of the large bubble and a second step corresponding to its transient behaviour after detachment. In terms of disengagement, an abrupt constriction induces systematic break-up of the large bubble whereas, with a smooth constriction, the large bubble undergoes strong deformations but does not break up. After detachment, large bubbles relax in a similar way and their velocities tend towards the terminal velocity of the 2D cap bubble.