Studies on Interfacial Characteristics of Highly Dispersible Silica Reinforced Epoxidized Natural Rubber Compounds

The present work examines the effect of two different specific surface areas of highly dispersible silica (HDS)-reinforced epoxidized natural rubber (ENR) composites. The influences of different blend ratio between ENRs consisting 25 and 50?mol% of epoxidation-based (ENR-25/ENR-50) composites was studied in detail. The primary objective is to investigate the interfacial area of HDS surface involved in filler-to-rubber interaction mechanisms for the better reinforcement. Notable improvement in overall properties of these green composites are corroborated with various meticulous characterization including cure characteristics, specific bound rubber content, physicomechanical, dynamic mechanical properties, etc. Increasing the specific surface area of HDS and their subsequent interface with ENR matrix invokes its superior dispersion. Small angle X-ray scattering (SAXS) has been used to analyze the particles network and clusters establishment in green composites. The present SAXS method provides a unique insight into the cluster formation according to the Beaucage model. However, SAXS results demonstrate that particles networks can be effectively suppressed by increasing specific surface area of HDS.     

800g/kg丁噻隆水分散粒剂的研制

丁噻隆是一种广谱性的脲类除草剂。在800g/kg丁噻隆水分散粒剂挤压法造粒配方筛选过程中,通过流点法筛选出润湿剂,通过经验法筛选出分散剂等助剂,在此配方基础上进行了小规模的重复放大试验,得到了800g/kg丁噻隆水分散粒剂挤压法造粒的优化配方。     

60% ZJ0862水分散粒剂的研制

ZJ0862是浙江省化工研究院有限公司和中国科学院上海有机化学研究所合作创制成功的具有自主知识产权的新型水稻田除草剂。在60% ZJ0862水分散粒剂挤压法造粒配方筛选过程中,文章通过流点法筛选出了润湿剂,通过经验法筛选出了分散剂等助剂,在此配方基础上进行了重复验证试验,得到了60% ZJ0862水分散粒剂挤压法造粒的优化配方。     

36%唑草酮·苯磺隆水分散粒剂的研制

介绍了36%唑草酮·苯磺隆水分散粒剂的研究过程,通过对载体、润湿剂、分散剂、崩解剂、填料的筛选,最后确定了36%唑草酮·苯磺隆水分散粒剂的优选配方。各组分及含量为:唑草酮22%、苯磺隆14%、载体A40%、EFW3%、木质素磺酸钠7%、硫酸钠3%、玉米淀粉补足100%。试验结果表明,按该配方生产的水分散粒剂在水中分散性好,悬浮率高,润湿时间小于90 s,崩解时间小于60 s,各项指标均符合水分散粒剂的质量要求。     

超微细改性氢氧化铝的工艺研究

采用改进的精制拜尔法制备超微细改性氢氧化铝,在种分过程中加入分散改性剂,解决了粒子团聚问题,提高了产品质量,实现粒子的表面改性,使晶种能多次循环使用,有效地降低了成本。优惠工艺条件为:αk=1.4、晶种系数1.5、分解温度40℃、分解时间为4h时,分解率53.68%,产品的平均粒径0.50μm。     

Study on water‐dispersible colloids in saline–alkali soils by atomic force microscopy and spectrometric methods

Recent studies have revealed that water‐dispersible colloids play an important role in the transport of nutrients and contaminants in soils. In this study, water‐dispersible colloids extracted from saline–alkali soils have been characterized by atomic force microscopy (AFM), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), and UV absorption spectra. AFM observation indicated that the water‐dispersible colloids contain some large plates and many small spherical particles. XRD, XPS, and UV absorption measurement revealed that the water‐dispersible colloids are composed of kaolinite, illite, calcite, quartz and humic acid. In addition, UV absorption measurement demonstrated that the humic acids are associated with clay minerals. Water‐dispersible colloids in the saline–alkali soils after hydrolyzed polymaleic anhydride treatment and an agricultural soil (nonsaline–alkali soil) were also investigated for comparison. The obtained results implied that the saline–alkali condition facilitates the formation of a large quantity of colloids. The use of AFM combined with spectrometric methods in the present study provides new knowledge on the colloid characteristics of saline–alkali soils. Microsc. Res. Tech. 79:525–531, 2016. © 2016 Wiley Periodicals, Inc.     

Water‐dispersible nanocomposites of polyaniline and montmorillonite

The polymerization of aniline (ANI) in aqueous medium in the presence of (NH₄)₂S₂O₈ and montmorillonite (MMT) resulted in the formation of a nanocomposite (PANI–MMT). The inclusion of PANI in the composite was confirmed by FTIR studies. The extent of PANI loading in the composite increased with ANI concentration at a fixed oxidant/MMT amount and with the oxidant amount at a fixed ANI and MMT weight, but decreased with an MMT amount at a fixed ANI and oxidant level. TGA revealed a higher stability for the PANI–MMT composite relative to PANI and confirmed a PANI loading of ca. 51% in the composite. The conductivity increased in all the cases. XRD analysis revealed no expansion of the d₀₀₁ spacing at 9.8 Å, implying no intercalation of PANI within the MMT layers. Scanning electron micrography studies revealed interesting morphological features for the composites. Transmission electron micrography analysis revealed distinctive features and confirmed the formation of PANI–MMT composite particles of diameters in the 300‐ to 400‐nm range. These composites could be obtained as stable colloids in the presence of poly (N‐vinyl pyrrolidone) under selective conditions. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2948–2956, 2000     

70%苯菌灵水分散粒剂的研制

以悬浮率、分散性、崩解性、热贮稳定性为标准,通过对不同润湿分散剂、崩解剂、粘结剂的筛选,得到70%苯菌灵水分散粒剂的最佳制剂配方为:苯菌灵原药70%,润湿分散剂脂肪醇硫酸酯盐AS 6.0%,崩解剂硫酸铵3.0%,粘结剂聚乙二醇2.0%,高岭土19%,该水分散粒剂悬浮率≥90%,分散性良好,热贮稳定性合格。     

80%特丁净水分散粒剂的研制

水分散粒剂是一种对环境友好的农药新剂型。研究了80%特丁净水分散粒剂的制备方法,确定了润湿剂、分散剂和填料的品种及用量,得到了优化配方,并对制剂样品的性能进行了测定,其结果符合水分散粒剂要求。     

丙烯酸-苯乙烯磺酸钠-甲基丙烯酸羟乙酯共聚物分散剂的合成及其应用

以丙烯酸(AA)、苯乙烯磺酸钠(SSS)和甲基丙烯酸羟乙酯(HEMA)为单体,经聚合反应得AA-SSS-HEMA三元共聚物钠盐分散剂,研究了其对BaSO4和农药莠去津的分散效果,用扫描电镜、光散射粒度分析仪等对分散后颗粒的表面形态及粒径分布进行表征. 结果表明,当单体的摩尔配比AA:SSS:HEMA=4:1:0.6、反应温度70℃、引发剂量占单体总量12%、聚合时间为2 h时,所制备的分散剂对BaSO4分散效果最好,悬浮率达到98.99%. 该分散剂对75%莠去津水分散粒剂的悬浮率为95.47%,与国外分散剂产品罗地亚T36的分散效果接近.