Study on carbon nanotube reinforced phenol formaldehyde resin/graphite composite for bipolar plate

Using carbon nanotubes (CNTs) after different Fenton treatments as a reinforcement and a phenol formaldehyde resin/graphite (PF/G) composite as matrix, a new composite for bipolar plate was formed by hot-pressing. The effects of Fenton, Fenton/ultrasonic and Fenton/ultraviolet treatments on the surface of the CNTs, and the bend strength and conductivity of bipolar plate composite produced using them were investigated. It was found that Fenton/UV treatment was an effective and advanced oxidation process, which could generate a large quantity of hydroxyl groups and few carboxyl groups on the sidewalls of the CNTs, but without severe damage. The functional groups on CNTs after Fenton/ultraviolet treatment can improve the interfacial adhesion between CNTs and matrix, which can improve the bend strength, but does not play an important role in the improvement of the conductivity. The bend strength and conductivity of the composite with 3% CNTs after Fenton/ultraviolet treatment are 68.6 MPa and 145.2 s cm⁻¹, respectively, when pressed at 240 °C for 60 min.     

Synthesis of Chelating Resin PETU and Its Adsorption to Ag(I)

A novel chelating resin (PETU) with thiourea groups in its main chain was synthesized by the reaction of O,O'-butane-1,4-diyl dicarbonisothiocyanatidate and triethylene tetraamine. The adsorption of Ag(I) on PETU was investigated by batch tests. The results showed that adsorption data fitted Boyd's diffusion equation of liquid film and the adsorption was controlled by liquid film diffusion. Under the temperatures between 15～60 ℃, the adsorption capacity decreased with the increase of temperature, and increased with the increase of initial concentration of Ag(I). The experimental data fitted Langmuir and Freundlich equations, and the correlation coefficients for Langmuir equation were between 0.9965～0.9998, and those for Freundlich equation were between 0.8211～0.9810, and increased with the adsorption temperature. △H, △G and △S calculated by thermodynamic formulae were all negative, which meant that the adsorption process was exothermic and spontaneous, and the entropy decreased during the process. XPS results showed that N, S and O atoms were the electron donors to coordinate with Ag.     

茶叶废料在脲醛树脂中的应用研究

将不同颗粒度的茶叶废料粉添加到脲醛树脂胶中,研究了茶叶废料的颗粒度、加入量等对脲醛树脂胶黏剂的游离甲醛含量、黏接胶合板的甲醛释放量及胶合强度的影响。实验结果表明,茶叶废料作为填料添加到脲醛树脂胶黏剂中,能够降低其游离甲醛含量以及其黏接胶合板的甲醛释放量;茶叶废料颗粒度越小,与脲醛树脂混合性越好,消除甲醛效果越显著;茶叶废料的适量加入不会降低胶合板胶合强度。     

硅烷改性环氧树脂自修复微胶囊的制备及应用

采用硅烷偶联剂γ-（2,3-环氧丙氧基）丙基三甲氧基硅烷（KH-560）对环氧树脂E-51进行改性,并以此为芯材,三聚氰胺-脲醛树脂（MUF）为壁材,原位聚合法合成微胶囊,探讨了微胶囊制备工艺,并用光学显微镜（OM）、扫描电子显微镜（SEM）、红外光谱仪（FTIR）、热重分析仪（TGA）等对其表面形貌、化学结构及热性能等进行了表征和测试;之后将改性后的微胶囊应用到自修复环氧树脂涂层中,考察了自修复涂层的力学性能和电化学性能。结果表明,当芯壁比为1.5：1、乳化剂质量分数为1.4%时,微胶囊为规则球形,表面粗糙、致密,大小均匀,平均粒径约为100μm,具有良好的热稳定性。当涂层中改性微胶囊质量分数为3%时,涂层的拉伸强度、弯曲强度、黏结强度及冲击强度均较高,且其较未改性微胶囊自修复涂层分别提高了14.9%、14.3%、16.0%和9.6%;与未改性微胶囊自修复涂层相比,改性微胶囊自修复涂层的电化学性能增强,且电化学阻抗值显著提高。     

国外圆筒仓的加固实例

要对单个圆筒仓进行加固是不成问题的 ,但要对整个筒仓群进行加固 ,那就很困难了。本文介绍了加拿大鲁帕达王子总粮站对筒仓群进行加固的工程实例 ,希望对我国类似工程的加固改造工作 ,能起到抛砖引玉的借鉴作用     

聚丙二醇二缩水甘油醚合成工艺研究

环氧丙烷聚醚是以 -OH为端基 ,当作为增韧剂与环氧树脂反应时 ,活性较小。通过将聚醚二端引入环氧基团 ,制备聚醚类二缩水甘油醚 ,以提高聚醚类增韧剂的增韧性和反应活性。对合成工艺参数和产品性能进行了探讨     

日本环氧树脂生产厂商发展概况

着重介绍日本环氧树脂主要生产厂商的发展概况     

新型环氧灌封胶的研究

通过环氧树脂、增韧剂、固化剂及固化促进剂的筛选 ,完成了一种在 130℃下、剪切强度大于 10MPa、不开裂、韧性好的环氧树脂灌封胶的研制工作 ,同时介绍了该灌封胶的主要性能指标     

玻璃钢贮油罐的防腐性能

本文详细介绍了间苯树脂缠绕玻璃钢地下贮油罐在美国应用的例子并进行了分析     

ABS树脂生产技术进展

论述了ＡＢＳ生产技术和高功能化ＡＢＳ，重点阐述了聚丁二烯胶乳合成技术和连续本体工艺，并对各种生产工艺进行了技术经济分析与比较。介绍了我国ＡＢＳ生产工艺，新产品开发和市场态势。