排序方式: 共有35条查询结果,搜索用时 15 毫秒
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丙纶强力丝在加工过程中,聚丙烯在高温下发生分解,产生有害烟气,造成操作环境污染,危害人体健康.采用提高抽风机位置,加大排风量,改进风机换气次数等措施,除烟率达85%以上. 相似文献
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邱运亮 《湖南环境生物职业技术学院学报》2005,11(1):13-16
以MS 6-BA2.5mg/L NAA0.2mg/L为初代培养基,以MS 6-BA2.0mg/L NAA0.1mg/L为增殖培养基,1,3MS IBA0.5mg/L为生根培养基,添加不同浓度的PP333,其结果表明:初代培养基中添加0.5mg/LPP333有利于库拉索芦荟外植体出芽,增殖培养基中添加0.1-0.5mg/LPP333对库拉索芦荟试管苗增殖有效,而在生根培养基中添加0.5—1.0mg/LPP333有利于生根和移栽,其中以1/3MS IBA0.5mg/L PP3330.5mg/L培养基对库拉索芦荟试管苗生根和移栽有良好效应. 相似文献
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Optimization of the recovery of plastics for recycling by density media separation cyclones 总被引:1,自引:0,他引:1
Gent Malcolm Richard Menendez MarioToraño Javier Torno Susana 《Resources, Conservation and Recycling》2011,55(4):472-482
Material recovery processes are presented as the optimum option for recycling plastic wastes as a means of recovering hydrocarbon resources. There exist a large variety of automated material recovery processes for recycling of such wastes but each with significant limitations. Of these, the separation based on differences in densities is advocated as the optimum process either for producing recycled products or preparing wastes for subsequent recovery processing.Density separation processes based on cyclone type density media separation (DMS) is presented as an important, potential method for increasing plastics recycling process capacities. It is demonstrated to have the capacity to separate a significantly larger range of particle sizes than those presently processed industrially. The mathematical relationship for the prediction of quality of typical LARCODEMS type density media separations by particle size and density as expressed by the Ecart Probable is presented.A proposed device configuration is presented for density media separation to optimize the recovery and purity of both density fractions produced. It is also suggested that to be economically viable, a large scale of operation is required for industrial plastics recycling operations recovering and producing a number of different plastics with a purity to be used as a substitute for virgin material. 相似文献
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利用废旧冰箱拆解的聚氨酯泡沫塑料(PU)和聚丙烯(PP)、聚丙烯接枝马来酸酐(PP-g-MAH)为原料,采用物理化学回收技术制备PU/PP复合材料。用正交实验法分析PU填充量、PU粒径和PP-g-MAH 3个因素对PU/PP复合材料力学性能影响的显著性。结果表明,PU填充量对PU/PP复合材料拉伸性能有显著影响,对冲击性能和弯曲性能没有显著影响;在本文的实验范围内,PU粒径对PU/PP复合材料的力学性能影响不大;而PP-g-MAH投加量对PU/PP复合材料具有一定的影响。确定的优化工艺配方为:PU 40%;PU粒径选择2.00 mm;PP-g-MAH投加量10%。采用优化工艺制备的PU/PP复合材料的密度为1 042.88 kg/m3;冲击强度为2.9 kJ/m2;拉伸强度为10.30 MPa;拉伸模量为1 100 MPa;弯曲强度为18.5 MPa;弯曲模量为733 MPa。 相似文献
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气液膜接触器分离混合气中CO2过程研究 总被引:1,自引:2,他引:1
建立了膜接触器吸收CO2 ,溶液热再生连续循环实验装置 ,评价了疏水性PP(聚丙烯 )微孔膜 ,MDEA(N 甲基二乙醇胺 )溶液及添加活化剂PZ(哌嗪 )的活化MDEA溶液吸收CO2 传质过程。结果表明 :在溶液浓度 2 5mol L ,气速0 5~ 3 0L min,液速 15~ 15 0mL min时 ,总传质系数Kov为 1 0× 10 - 5~ 3 6× 10 - 5m s(MDEA) ,1 6× 10 - 5~ 4 5×10 - 5m s(MDEA +PZ)。采用阻力层无因次关联方程模型预测Kov值 ,计算值和实验值符合较好。基于模型和实验结果 ,将PZ的吸收行为作为溶液的活化作用 ,在计算Kov值时 ,考虑活化作用因素并归结于化学增强因子E中 ,模型能更好地预测实验结果。实验证明在单一醇胺组份MDEA中添加少量PZ能提高总传质系数Kov值 相似文献
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新型膨胀型阻燃剂的合成及其在聚丙烯(PP)中的应用 总被引:1,自引:0,他引:1
以氨基三甲叉磷酸(ATMP)、尿素为原料采用热缩合法合成新型膨胀型阻燃剂一ATU。用傅里叶红外光谱及元素分析表征ATU的结构及组成。将ATU与常见碳源季戊四醇进行复配,应用于PP材料的阻燃。研究发现ATU集气源酸源于一身,对于PP阻燃效果明显,甚至好于同比例的APP。极限氧指数仪和垂直燃烧仪测试材料燃烧等级;微型燃烧量热仪(MCC)研究了材料燃烧过程中热释放情况;热重分析(TGA)和扫描电镜(SEM)分别从材料的热降解及成炭原理方面上对ATU的阻燃机理进行了研究。 相似文献