动态三螺杆挤出机制备热塑性硫化胶的研究

对比分析了动态热塑性硫化胶(TPV)的加工设备,着重介绍了附加振动力场的三螺杆反应挤出机的结构特点以及利用该机进行三元乙丙橡胶/聚丙烯(EPDM/PP)的动态全硫化,对制品的物理力学性能和微观结构分别进行了测试分析和电镜扫描。结果表明,振动力场作用下EPDM/PP共混体系反应挤出动态硫化加工可有效地实现动态硫化反应、硫化橡胶的粉碎和分散以及相态反转,振动力场的作用明显提高了TPV性能。     

神经网络-光度法同时测定食品中防腐剂和甜味剂

根据食品中常用防腐剂本甲酸和山梨酸及甜味剂糖精钠在紫外区均有吸收的特点，建立了一种以紫外分光光度法为基础对该三组分同时测定的方法，光谱数据采用作者自编的径向人工神经网络MATLAB程序进行处理，苯甲酸、山梨酸和糖精钠的平均标准偏差分别为1.60%、5.23%和1.21%，回收率大为95.0-102.0%之间，将该法应用于食品中二组分的测定，获得较为满意的结果。     

三峡工程用中热硅酸盐水泥品质指标控制的意义及方法

为确保用于大坝工程中水泥的质量, 1998年中国长江三峡工程开发总公司 (以下简称"总公司" )委托国家水泥质量监督检验中心对供应三峡大坝水泥的生产厂进行驻厂监督三峡工程用中热硅酸盐水泥 R2O和 MgO指标,并根据各厂的实际情况订出具体监控办法。笔者作为国家水泥质量监督检     

20%单氰乳剂剂型研究

本文所叙述的单氰乳剂，是一种新的复配农药制剂。它不仅增效作用显著，对为害农作物的蚜虫和红蜘蛛有很强的杀灭作用；而且其剂型独特，为国内尚不多见的水包油型的复配农药新制剂－微乳剂。该制剂生产工艺简单，产品性能稳定，常温贮存一年，有效成分分解率低于１．５％；在６０℃至－５℃范围内，其产品均为均相透明的液体，且乳化性能十分优良。目前该品种已取得农药登记，正式投产。     

Kinetics of the peracetic acid decomposition: Part II: pH effect and alkaline hydrolysis

The effect of pH on the decomposition of peracetic acid in an aqueous solution was studied. It was found that three potential reactions, namely i) the spontaneous decomposition, ii) the hydrolysis and iii) the transition metal catalysed decomposition, are responsible for the consumption of peracetic acid. The spontaneous decomposition reaches its maximum at pH 8.2, while both the hydrolysis and metal ion catalysed decomposition increase as the pH increases. At pH 10.5 and higher, the hydrolysis becomes dominant when the metal ion catalysed decomposition is minimized by the addition of DTMPA. The kinetics of the peracetic acid hydrolysis was developed, which can very well predict the development of peracetic acid and hydrogen peroxide during the decomposition reaction.     

Stresses of cohesionless granular flows in liquids

We construct constitutive relations for friction stress, slide stress and collision stress of cohesionless granular flows. We propose that the friction stress and slide stress could be neglected when τ_c/τ_e < 0.02, where τ_c represents the interval time experienced by a given particle between two consecutive binary collisions and τ_e the particle relaxation time. We applied these constitutive relations to a simulation of solid-liquid flow in an inclined chute and found the simulation results agree with experimental data.     

Preparations and properties of thermosensitive terpolymers of N‐isopropylacrylamide,sodium 2‐acrylamido‐2‐methyl‐propanesuphonate,and N‐tert‐butylacrylamide

Terpolymers based on N‐isopropylacrylamide, sodium 2‐acrylamido‐2‐methyl‐propanesulfonate, and N‐tert‐butylacrylamide were synthesized by free‐radical copolymerization with 2,2′‐azobisisobutyronitrile as an initiator. The lower critical solution temperatures (LCSTs) of the linear polymer aqueous solutions were determined by the measurement of the transmittance on UV at different temperatures. The influence of the polymer concentration, polymer composition, and ionic strength on the LCSTs of the linear polymers was investigated. The LCST decreased with increases in the hydrophobic monomer N‐tert‐butylacrylamide, polymer concentration, and ionic strength. The phase transition became sharp when the polymer concentration and ionic strength increased. Meanwhile, the crosslinked hydrogels were prepared with the same recipe used for the linear terpolymers, but a crosslinker was added to the reaction system. The swelling ratios of the hydrogels at various temperatures and salt solutions were determined. The hydrogels possessed both high swelling ratios and thermosensitivity. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

HS－900有机硅密封抗渗防水剂性能的研究

ＨＳ－９００有机硅密封抗渗防水剂是一种新型的有机硅改性硅酸盐防水材料。具有良好的抗渗性能和耐酸碱腐蚀能力。将其涂于低标号混凝土材料上，效果尤其明显。     

利用煤层气发展山西合成油工业探讨

介绍了国外利用天然气生产油口的生产工艺，探讨了山西省利用丰富的煤层气资源发展合成油的可能性和优势，并提出了相应的发展建议。     

强化单螺杆挤出机内层流混合的方法

综述了单螺杆挤出机内聚合物熔体层流混合机理的研究进展，对提高混合的措施进行了分析总结，指出了进一步强化混合效果的方法。