提高离子交换树脂净水功能的研究   总被引：1，自引：0，他引：1  

邬泽成  何建平 《西南大学学报(自然科学版)》1996,18(3):296-298

对过度老化与中毒的离子交换树脂，进行饱和ＮａＣｌ处理，“反处理”和醇再处理等，可使树脂重新活化，恢复出水质量与数量。  相似文献   

天然胶乳的补强研究进展     

罗文杰  汪志芬  李思东  方林  林华 《热带生物学报》2011,(4):383-388

综述了近年来天然胶乳的无机粒子、有机粒子、树脂乳液及其他填料对天然胶乳的补强研究进展,并对未来胶乳补强技术的发展方向做了简单的分析.  相似文献   

Effects of Liquid Crystalline Epoxy Resin on the Properties of Bio-based Cardanol-furfural Resin北大核心CSCD     

Zhang K.Tang G.Yan Z.Ma L.Huang X. 《林产化学与工业》2018,(4):41-46

By using polarized optical microscopy, differential scanning calorimetry, scanning electron microscopy and impact strength measurements,the effects of liquid crystalline on the morphologies, thermal properties and mechanical properties of the composite resins were studied. It was found that the synthesized 4,4-diglycidyloxybiphenyl (BP) and sulfanilamide (SAA) were used to generate novel liquid crystalline (LC) epoxy resins notably. The results revealed that the curing of the cardanol-furfural resins was accelerated and the thermal properties were considerably improved by adding the LC epoxy resins.When the addition of BP-SAA was 50%, the glass transition temperature increased from 60.4 ℃ to 70.2 ℃, and the thermal decomposition temperature increased from 300.3 ℃ to 377.4 ℃, respectively. When the addition of BP-SAA was 30%, the impact strength of the modified resins was 15 kJ/m2 and about three-fold higher than that of the unmodified counterpart. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.  相似文献   

三种大孔吸附树脂纯化茶黄素的研究     

郁军  王丽璞  岳鹏翔  房婉萍  陈暄  黎星辉 《茶叶科学》2011,31(5):447-452

采用NKA-9、AB-8和ADS-7 3种不同极性的大孔吸附树脂研究纯化茶黄素的工艺条件。比较大孔树脂的类型、pH值、上样速度、除杂液质量分数、样品洗脱液质量分数和体积对茶黄素纯度的影响,初步确定工业纯化茶黄素的工艺。结果表明,NKA-9的纯化效果明显优于AB-8和ADS-7,采用NKA-9纯化茶黄素的最佳工艺条件为：pH值为3,上样速度2BV/h,先用1BV 15%的乙醇除杂,再用3BV 90%的乙醇洗脱。纯化后茶黄素的纯度为44.1%。各单体纯化条件与上述纯化条件不尽相同,单体纯度与纯化条件密切相关。  相似文献   

Horizontal matter fluxes and leaching losses in urban and peri‐urban agriculture of Kabul,Afghanistan     

Zikrullah Safi  Martina Predotova  Eva Schlecht  Andreas Buerkert 《植物养料与土壤学杂志》2011,174(6):942-951

Little is known about nutrient fluxes and nutrient‐use efficiencies in urban and peri‐urban agriculture (UPA) of rapidly expanding cities in developing countries. Therefore, horizontal flows of carbon (C), nitrogen (N), phosphorus (P), and potassium (K) as well as leaching losses of mineral N and P were measured over 2 years in three representative agricultural production systems of Kabul. These comprised 21 gardens and 18 fields dedicated to vegetable farming, cereal farming, and table‐grape production (vineyards). Across sites (fields and gardens) biennial inputs averaged 375 kg N ha^–1, 155 kg P ha^–1, 145 kg K ha^–1, and 15 kg C ha^–1 while with harvests 305 kg N ha^–1, 40 kg P ha^–1, 330 kg K ha^–1, and 7 kg C ha^–1 were removed. In vegetable gardens, biennial net balances were 80 kg N ha^–1, 75 kg P ha^–1, –205 kg K ha^–1, and 4 kg C ha^–1, whereas in cereal farming biennial horizontal balances amounted to –155 kg N ha^–1, 20 kg P ha^–1, –355 kg K ha^–1, and 5 kg C ha^–1. In vineyards, corresponding values were 295 kg N ha^–1, 235 kg P ha^–1, 5 kg K ha^–1, and 3 kg C ha^–1. Annual leaching losses in two selected vegetable gardens varied from 70 to 205 kg N ha^–1 and from 5 to 10 kg P ha^–1. Night soil and irrigation water were the major sources among the applied nutrient inputs in all studied farming systems, contributing on average 12% and 25% to total N, 22% and 12% to total P, 41% and 53% to total K, and 79% and 10% to total C, respectively. The results suggest that soils in extensive cereal fields are at risk of N and K depletion and in vegetable gardens of K depletion, while vineyards may be oversupplied with nutrients possibly contributing to groundwater contamination. This merits verification.  相似文献   

硼改性酚醛树脂与丁腈橡胶比例对摩擦材料性能的影响   总被引：1，自引：0，他引：1  

刘军恒  何春霞  刘静  付菁菁  陆德荣 《农业工程学报》2013,29(18):84-89

为探究硼改性酚醛树脂与丁腈橡胶的质量比(BPF/NBR)对复合摩擦材料力学性能、耐热性能和摩擦磨损性能的影响,采用不同比例的丁腈橡胶和硼改性酚醛树脂作为复合摩擦材料基体,添加碳纤维、钢纤维、石墨、氧化铝粉和沉淀硫酸钡制成复合摩擦材料。对复合摩擦材料的密度、硬度、压缩强度和摩擦磨损性能进行了测试,用变焦距体视显微镜观察磨损表面,并分析其磨损机理。用差分扫描量热仪对摩擦材料进行耐热性分析。结果表明:BPF/NBR质量比对复合摩擦材料的力学性能、耐磨及耐热性影响较大;当硼改性酚醛树脂与丁腈橡胶质量比为6∶1时,复合摩擦材料有最高的密度、硬度和压缩强度,分别为1.933 g/cm~3、105 HRL和134 MPa;当硼改性酚醛树脂与丁腈橡胶质量比为5∶1时,摩擦材料的磨损量最小;随着BPF/NBR比例增大,复合摩擦材料表面抗犁削作用增强,黏着转移减弱。利用丁腈橡胶二次改性硼改性酚醛树脂能显著提高硼改性酚醛树脂的耐热性能,且硼改性酚醛树脂与丁腈橡胶的最佳比例介于4∶1和5∶1之间。  相似文献   

大孔吸附树脂纯化紫苏叶花色素苷的研究     

胡晓丹  张德权  孙爱东 《北京林业大学学报》2008,30(4):34-38

通过比较8种大孔吸附树脂对紫苏叶花色素苷粗提物的静态吸附和解吸性能,筛选出大孔吸附树脂XAD-7,并对其动态吸附和解吸条件(如上样液浓度、酸度、盐度、洗脱溶剂及流速等)进行研究。结果表明:将紫苏叶花色素苷上柱液用稀盐酸调节pH值至3.0,调整溶液花色素苷的浓度大于6.5 mg/mL,添加不超过10%的食盐,以10 BV/h的流速上柱5 h,至XAD-7树脂吸附饱和,然后用大量的0.1% HCl洗脱至洗脱液不含糖类等杂质,将30%的乙腈溶液用稀盐酸调节pH值至3.0,以2 BV/h的流速洗脱4 h,得到的精制品中花色素苷的含量为78.18%,树脂富集倍数为2.66。   相似文献   

大孔吸附树脂对冠毒素的吸附工艺研究   总被引：1，自引：0，他引：1  

周静  李仕祥  郭成志  吴晓玉 《西北农业学报》2008,17(5):132-138

从5种不同类型大孔吸附树脂中筛选出HZ-818树脂对发酵液中冠毒素进行静态、动态吸附性试验,考察不同条件下对发酵液中冠毒素吸附、解吸的影响。结果表明:在静态试验中,吸附4 h后达到平衡,最高吸附量为27.06 mg/g,COR在20℃、发酵液pH为5时吸附率最高,吸附曲线符合Langmuir曲线,采用1%氨水∶60%乙醇=1∶2的混合洗脱剂,回收率可达85.8%;在动态试验中,室温及调整发酵液pH为5时,上柱流速为4.5BV/h时,绝大部分COR能被树脂吸附,动态贯穿吸附量为30.87 mg/mL湿树脂,吸附率为91.63%;正交最佳吸附条件为:20℃,上柱pH 5,上柱流速为3 BV/h时,冠毒素吸附量最佳,吸附率为93.14%;随后用洗脱剂通过树脂,洗脱流速为4.5BV/h,其回收率可达86.62%。  相似文献   

苯酚-尿素-甲醛共缩聚树脂研制Ⅰ.合成与分析   总被引：9，自引：0，他引：9  

杜官本  李君  杨忠 《林业科学》2000,36(5)

以苯酚、尿素和甲醛为起点合成了一种苯酚—尿素—甲醛共缩聚 ,并对树脂性能和结构进行了全面分析评估。结果表明所合成的共缩聚树脂贮存稳定 ,固化速度快 ;差热分析和热重分析表明苯酚—尿素—甲醛共缩聚树脂的热行为与酚醛树脂十分相似而与脲醛树脂显著不同 ;13 CNMR结构分析中分别观测到源于共缩聚结构单元o -Ph -CH2 -NHCO -(δ =4 1 .5)和 p -Ph -CH2 -NHCO -(δ =4 4.8)的吸收 ;使用PUF共缩聚树脂压制的竹木复合中密度纤维板和竹大片刨花板 ,其板材的物理力学性能明显高于脲醛树脂而与常规酚醛树脂相近。  相似文献   

大孔吸附树脂分离纯化贯叶连翘中的金丝桃素     

薛晓丽  张克勤 《中国兽药杂志》2016,50(7):20-24

以贯叶连翘粗提浸膏为材料,考察六种大孔吸附树脂分离纯化金丝桃素的性能。采用静态、动态吸附方法筛选树脂,以中压分离方法确定分离纯化的条件。结果表明:HZ-801树脂以其高吸附率、高洗脱率成为优选的分离填料,其最佳分离纯化条件为:进样液质量浓度为0.1125 g/m L,进样速度为5.0 m L/min、洗脱速度为20 m L/min,0~95%乙醇溶液梯度洗脱,金丝桃素的纯度为79.11%。HZ-801可以较好分离纯化金丝桃素,纯化工艺具有较大实践性及参考价值。  相似文献