共查询到19条相似文献,搜索用时 140 毫秒
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化工废水成分复杂多样,含有高浓度的氨氮、酚、油等,成分中含有毒性物质。目前采用的处理工艺分离效率低、成本高、能耗高,且需要加入多种药剂,极易造成二次污染。大孔树脂可以吸附化工废水中的油、酚物质,实现化工废水的资源化、无害化处理,通过对大孔树脂在化工废水中吸附能力的影响因素研究,发现实现大孔树脂吸附能力最大化的环境,实现大孔树脂在化工废水中的最大吸附能力。 相似文献
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采用环氧树脂(E-51)与氰酸酯树脂共聚以改善氰酸酯树脂的韧性,研究了环氧树脂的加入量,后处理温度、湿热老化以及紫外光老化等条件对改性后树脂体系力学性能的影响规律,采用扫描电子显微镜对断口形貌进行了分析。结果表明环氧树脂可以明显改善氰酸酯树脂的韧性,环氧树脂含量为30%(质量百分数,下同)的体系的冲击强度和弯曲强度分别比改性前提高了100%和50%随环氧树脂用量的增加,改性树脂的冲击强度和弯曲强度提高,树脂表现为明显的韧性断裂;改性体系经2000℃、后处理2h的力学性能最佳;湿热老化和紫外光老化都使改性树脂体系的冲击强度和弯曲强度降低,而后者的影响较弱,当环氧树脂用量低于30%时冲击强度和弯曲强度的保持率均高于95%。 相似文献
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随着工业化进程的推进,高浓度有机废水的产生量与日俱增,环境威胁日益严重。因此,如何有效处理高浓度有机废水已成为一个重要的科学问题。膜分离技术以其分离效率高、能耗低、无相变、应用范围广等优势,受到了广泛关注和应用。为此,利用Citespace对相关文章进行可视化分析,综述了膜生物反应器、超滤、纳滤、反渗透、膜组合工艺以及改性膜材料在高浓度有机废水处理中的研究进展。同时,分析了高浓度有机废水及污泥处理过程中的资源化现状。最后,总结了膜分离技术用于高浓度有机废水处理的难点和存在问题,在此基础上,对如何加强污水资源化管理和优化废水排放技术进行了展望。 相似文献
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以废树脂为原料,通过改进氧化工艺,采用环保型氧化剂双氧水直接氧化制备苯并噻唑,附加值高,变废为宝,改善生态环境。以苯并噻唑收率为考察指标,探讨了投料比(甲苯/树脂)、氧化剂比例(双氧水/树脂)、反应时间、反应温度等因素对氧化反应的影响。最佳工艺实验条件:投料比(甲苯/树脂)2倍、氧化剂比例(双氧水/树脂)1.22倍、反应时间8 h、反应温度60℃。此工艺不经过氢氧化钠溶解过滤步骤直接用双氧水氧化,直接用甲苯溶解原料,省去甲苯萃取步骤,简化工艺流程,节约大量成本,同时废水含盐量大大降低,后续处理较容易。可为生产促进剂M产生的废树脂资源化利用提供一条新工艺方法。 相似文献
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介绍了两步法高品质环氧树脂生产新工艺,针对其工艺过程以及吸收处理挥发性溶剂产生的高浓度有机废水污染防治措施进行分析和论述,并提出替代方案。 相似文献
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丙烯酸改性F-44环氧树脂及其光固化性能研究 总被引:8,自引:0,他引:8
研究了丙烯酸改性F - 44环氧树脂的制备条件 ,包括催化剂的用量、反应时间、反应温度对丙烯酸转化率的影响。发现当反应温度为 95℃、催化剂的用量为单体质量的 1 5 %时 ,6h之内反应即可完成 ;用紫外光曝光、FT -IR跟踪碳碳双键含量变化的办法测试并证实了改性树脂具有优良的光敏性 ,紫外光曝光 5s后 ,双键反应程度达到 6 0 % ;残留 5 0 %环氧基的丙烯酸改性F - 44树脂制成的漆膜在紫外光曝光后的附着力达到 1级 ,并在质量分数为 10 %的酸、碱溶液及丙酮、甲苯中 2 5℃浸泡 1h无变化。采用FT -IR对所合成的树脂的结构进行了表征 ,证实改性树脂中含有环氧基、丙烯酸结构 相似文献
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Advanced chemical recycling of carbon fiber reinforced plastic (CFRP) was developed using supercritical methanol. In this method, the thermosetting epoxy resin in CFRP was converted to a thermoplastic resin by the selective decomposition of the bridged structure by supercritical methanol at 270 °C and 8 MPa for 90 min and the resin dissolved in supercritical methanol. On the other hand, the carbon fiber was fully recovered from CFRP without the plastic component and it had no thermal damage. The bridged structure in the epoxy resin could be formed again by adding a cross-linker to the recovered thermoplastic resin and the thermosetting resin was reproduced. This was the first attempt on the recycling of thermosetting epoxy resin. However, in order to maintain the strength of the recycled epoxy resin to that of virgin epoxy resin, the proper ratio of the recovered thermoplastic resin to virgin epoxy resin was determined. The recovered carbon fiber from CFRP maintained the shape of the plain fabric and the reduction of the tensile strength was less than 9% compared with the virgin one. The recovered carbon fiber could be used to make a recycled CFRP with epoxy resin and cross-linker, the strength of which was close to that of virgin CFRP. 相似文献
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环氧改性水性聚氨酯的合成工艺及性能研究 总被引:1,自引:0,他引:1
采用甲苯二异氰酸酯(TDI)、聚醚二元醇(GE-210)、1,4-丁二醇(BDO)、二羟甲基丙酸(DMPA)、环氧树脂(E-128)和丙烯酸羟丙酯(HPA)为主要原料,制备环氧改性水性聚氨酯乳液。研究预聚体中的—NCO和—OH物质的量之比(R)及小分子扩链剂、亲水扩链剂、环氧树脂的加入量,对粒径、黏度、贮存稳定性和涂膜耐水性的影响。实验结果表明:预聚体中R值为6~7;小分子扩链剂BDO用量为7%~8%;亲水扩链剂DMPA的用量为6%~7%;环氧树脂添加量为6%~7%时,乳液外观及稳定性最好,涂膜的耐水性能优异,可以作为一种性能优异的涂料用水性聚氨酯树脂。 相似文献
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In 1996, the authors proposed a novel method to prepare micron-sized, hollow cross-linked polymer particles. This method is based on the self-assembling of phase separated polymer at interface with water, which was named SaPSeP method, formed by suspension polymerization of divinyl monomer in toluene droplet dissolving previously polystyrene. The SaPSeP method was developed to be applicable to polyaddition reaction system of epoxy resin with diamine. The presence of PS dissolving in epoxy/diamine/toluene droplets promotes the phase separation of the epoxy resin reacted with the diamine. The epoxy resin molecules tend to adsorb at the interface of the droplets. These points were accord with the required conditions for the preparation of hollow particle by the SaPSeP method. Cured epoxy resin particles having one hollow were successfully prepared by the polyaddition reaction in the dispersed system of Epikote 806/630/604, of which equivalent ratio was 5/4/1. 相似文献
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环氧改性水性聚氨酯涂料的合成与性能研究 总被引:34,自引:5,他引:34
采用环氧树脂与聚醚、二羟甲基丙酸(DMPA)和甲苯二异氰酸酯(TDI)反应制备水性聚氨酯涂料。研究发现随着所用的环氧树脂的环氧值的降低,改性水性聚氨酯涂膜的硬度和拉伸强度逐渐提高,断裂伸长率则随着降低。选用环氧值为0.44的环氧树脂所合成的改性水性聚氨酯的涂膜硬度达到玻璃硬度0.70;随着环氧树脂添加量增大,涂膜机械性能增加。采用后添加环氧树脂的合成工艺,可制备贮存稳定的水性聚氨酯乳液;凝胶渗透色谱(GPC)分析表明环氧树脂改性水性聚氨酯提高了聚氨酯的分子量。性能测试表明环氧改性水性聚氨酯涂料具有涂膜硬度高、耐水性好和耐溶剂性好等优点。 相似文献
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利用甲苯精馏余热处理医药中间体生产过程中粗品废水的原理,设计出一套合理的三效蒸发污水处理装置,并对其效益进行了分析.分析结果表明,利用此装置,甲苯精馏余热得到综合利用,生产过程中的粗品废水得到基本处理,废水中的硫酸铵也可作为副产品进行销售,因此废水处理成本大大降低.此外,此装置的利用还可以避免原多效蒸发装置运行过程中产... 相似文献
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An epoxy resin (E‐51)‐modified acrylic–polyurethane emulsion with triethylenetetramine (TETA) serving as the postcrosslinking agent was synthesized. The curing reaction between E‐51 and the curing agent TETA during the film‐forming course was monitored and identified by an infrared spectrophotometer. The stabilities of the single‐pack emulsion during the polymerization course as well as the storage stage were investigated. The effect of the epoxy resin was studied in terms of the dispersion size of the emulsion, the mechanical properties, as well as the swell in water and toluene of the cast film, The emulsion was shown to be stable when the epoxy content was below 20% based on the mass of the polyacrylate in the system. The tensile strength and the modulus and the water and toluene resistance were enhanced with increase of the epoxy resin. In contrast, the elongation at break was decreased. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 470–475, 2003 相似文献