表面改性SiO2纳米微粒的表征及摩擦学性能

文中采用透射电镜、X射线粉末衍射仪、FT-IR光谱仪对改性SiO2纳米微粒进行了结构表征,并考察了其在油性介质中的分散性及在往复摩擦试验机和四球摩擦试验机上的摩擦学行为.结果表明,此二氧化硅纳米微粒粒径为10～20nm,表面键合有机碳链化合物,在润滑基础油中有很好的分散性,作为润滑油添加剂具有显著的抗磨减摩性.     

Synthesis of CaWO4：Eu3＋ phosphor powders via ethylene glycol route and its optical properties

Eu3+ doped CaWO4 with tetragonal system were prepared at comparatively low temperature (125 ?C) in ethylene glycol medium. The phosphor was further investigated by X-ray diffractometer (XRD), photoluminescence spectrophotometer (PL), Fourier transform infra red (FT-IR) spectroscopy and transmission electron microscopy (TEM). XRD analysis indicated a decrease in the unit cell volume of CaWO4 with increasing Eu3+ ion concentration. It indicated the homogeneous substitution of Ca2+ ions in CaWO4 by the Eu3+ ions. TEM images showed that the particle size ranged from 20 to 200 nm and it could extend the application of the nanoparticles. The photoluminescence study showed that the intensity of electric dipole transition (5D0→7F2) at 614 nm dominated over the magnetic dipole transition (5D0→7F1) at 592 nm. The optimum concentration of Eu3+ for the highest luminescence was found to be 20 at.%. The as prepared samples were found to be dis-persible in water and methanol.     

相对分子质量和磺化度对木质素磺酸钠农药分散剂性能的影响

测定了美国Meadwestvaco公司的VSI系列的9种木质素磺酸钠(简称木钠)的结构特征,发现木钠的相对质量分数很高,基本都在90%以上。以各木钠为分散剂,制备烯酰吗啉水分散粒剂(WG),并测定其热贮前后应用性能,结果发现,较高的相对分子质量(简称分子量)和磺化度的木钠,有利于提高WG的悬浮率。D80木钠作分散剂的WG热贮后悬浮率最高,为95.89%。进一步考察了WG的分散稳定性,结果发现,在磺化度相近时,提高木钠分子量有利于提高WG悬浮液的分散稳定性;而分子量相近时,木钠的磺酸基对WG分散稳定性影响较小。D80木钠的烯酰吗啉WG悬浮液静置15min才出现沉淀,沉淀层厚度为0.47mm,稳定性最好。     

高浓度固体农药80%吡蚜酮水分散粒剂的研制

通过对80%高浓度吡蚜酮水分散粒剂的配方研究,并用正交试验方法以润湿性和崩解性2种指标对80%吡蚜酮水分散粒剂的表面活性剂组成及其配比进行了筛选,各组成及其含量为:吡蚜酮原药80%/DIS213 5%、WET-800 3%、葡萄糖2%、硫酸铵6%、玉米淀粉补足100%。结果表明,该制剂配方分散性好,悬浮率为95%,润湿时间20 s,崩解时间60 s,热贮(54±2)℃14 d后合格,各项指标均符合水分散粒剂的质量标准。     

20%氟啶脲水分散粒剂的研制

水分散粒剂是一种环保的农药新剂型。研究了20%氟啶脲水分散粒剂的制备方法,确定了润湿剂、分散剂、粘结剂、崩解剂的品种及用量,得到了优化配方,并对制剂样品的性能进行了测定,达到合格水分散粒剂要求。     

水分散粒剂中助剂的性能及发展分析

对助剂在水分散粒剂中的作用原理、应用现状、发展趋势进行了综述。重点介绍了分散剂的作用及应用品种。着重论述了表面活性剂在水分散粒剂中的发展趋势,指出了专用型表面活性剂、分子量大的分散剂、表面活性高、环境相容性好的新型表面活性剂是当今表面活性剂发展的主要方向。     

甲氨基阿维菌素苯甲酸盐-HTlc杂化物水分散粒剂的优化配方

[目的]筛选出26％甲氨基阿维菌素苯甲酸盐-HTlc杂化物水分散粒剂的最佳配方.[方法]通过对润湿剂、分散剂、崩解剂、黏结剂等助剂的筛选,采用正交试验设计的方法确定了最佳配方.[结果]甲氨基阿维菌素苯甲酸盐-HTlc杂化物78％,润湿剂SDS+RS为6％,分散剂Morwet D425为5％,崩解剂尿素为10％,黏结剂蔗糖为1％.[结论]制剂悬浮率90％以上,崩解时间小于180 s,热贮[(54±2)℃,14 d]分解率小于5％,产品各项指标符合水分散粒剂的要求.     

A New Type of Dispersant [Sodium Salt of Styrene–Methacrylic Acid Copolymer (SSMA)/Montmorillonite (MMT) Nanocomposite] for Pesticide Water Dispersible Granules

A new type of dispersant [sodium salt of styrene–methacrylic acid copolymer (SSMA)/montmorillonite (MMT) nanocomposite] with different content of the MMT was synthesized through in situ solution free radical copolymerization. X‐ray diffraction measurements and electron microscopy observations prove that SSMA molecules can enter the interlayer space of MMT and form an intercalated structure. There are both fully intercalated and partly intercalated structures in the nanocomposites, which are related to the loading content of MMT. Transmission and scanning electron microscopy images indicate that the exfoliation degree of MMT in the nanocomposites decrease with increasing MMT content. Infrared spectroscopy (FTIR) analysis shows that there are hydrogen‐bonding interactions between carboxyl groups of SSMA and hydroxyl groups of MMT. Atrazine water dispersible granules were prepared by using SSMA/MMT nanocomposite as dispersant and their suspensibility in aqueous solution was determined to evaluate the dispersion properties of the nanocomposite. The results show that the addition of MMT can not only increase the steric effect of the SSMA to improve its dispersion properties, but also reduce the production cost of SSMA. The optimum loading content of MMT is 10 wt%.     

呋喃丹水分散粒剂的配制实验研究

在制备质量分数5%呋喃丹水分散粒剂的配方实验中,我们进行了不含呋喃丹原料的空白颗粒剂的配方实验,并对空白颗粒的磨损率、崩解性、分散性进行了测定,从中筛选出载体、分散剂、湿润剂制备空白颗粒的最佳配方,实验证明该配方作为质量分数为5%呋喃丹水分散粒剂最终颗粒的配方,其制剂性能优良.     

独一味分散片的制备及质量控制

目的:利用均匀设计筛选出独一味分散片的最佳处方。方法:通过调节崩解剂的含量、粘合剂的浓度等因素,制备独一味分散片,考查崩解时限、混悬性、溶出度等因素,对处方进行筛选。结果:优化处方为A4B6C3,即维晶纤维素含量为11%,交联聚乙烯吡咯烷酮含量为15%,聚乙烯吡咯烷酮K30浓度为7%。对优选处方的试验表明:崩解时限小于3min,分散均匀性试验能通过2号筛网,混悬性较好,溶出度好。结论:本方法简单、可靠,优选处方的独一味分散片达到中国药典(2010年版)要求。