固相法低度氯化聚乙烯耐老化性能的研究

用室温对折断裂试验,研究固相法低度氯化聚乙烯老化性能,当氯含量约为7.4％时,其老化时间发生突跃,老化时间发生突跃时,氯含量与试样的氯化温度和老化温度有关.     

Union production of low chlorinated polyethylene and chlorinated paraffin via a carbon tetrachloride solvent free process

A novel process for producing low chlorinated polyethylene (LCPE) with chlorinity of 28–33% by weight is presented, in which a reactive solvent, paraffin, is used as a green solvent to replace the commonly used inert solvent, carbon tetrachloride (CTC), an ozone depleting substance (ODS) being phased out under the Montreal Protocol. This process utilizes the principle that paraffin can dissolve high density polyethylene (HDPE) at about 135°C and the resulting solution can be chlorinated by chlorine forming two useful products simultaneously, viz chlorinated paraffin (CP) and LCPE, which are mutual soluble even at lower temperature e.g.70°C. The present process is superior to the conventional CTC solvent method because it can reduce the solvent emission dramatically, enhance the volume efficiency of reactor and achieve a union production of LCPE and CP under atmospheric pressure. The structure and properties of LCPE produced by two different methods are determined by differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectrometer, proton magnetic resonance (¹H NMR), and gel permeation chromatography (GPC). The results indicate that polyethylene chain can be homogeneously chlorinated in paraffin as in CTC solvent via a radical mechanism, and the chlorinity of CP and LCPE is virtually same under optimal conditions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

凉水河污染对土壤和地下水的影响

在凉水河下游取河床底泥及河床下部土样,分析其NH3-N、磷和有机物的变化,发现底泥对NH3-N和磷的去除发挥了很大作用,分别是下部土壤吸附量的10倍和1倍多;土中5种氯代烃均有检出,是河水长期渗漏积累的结果。凉水河流域内的野外试验结果表明,凉水河对地下水存在污染,污染组分主要是CODCr,NH3-N也有一定污染,其他无机污染组分如NO3-N,Cr6+,TP和Pb2+对地下水的影响较小,氯代烃对地下水也有一定影响。据推测,凉水河污染对地下水的影响范围大概在河两侧80 m范围内。     

Chlorinated organics from chlorine used in water treatment

The contribution from impurities in chlorine to levels of chlorinated organics found in potable water after chlorination was investigated. Techniques for sampling of chlorine and gas chromatography (GC) determination of chlorinated organics in chlorine are described. The detection limits were better than 1 ppm for each of chloromethane, dichloromethane, chloroform, carbon tetrachloride, trichloroethylene, tetrachloroethylene, hexachloroethane, hexachloropropane and hexachlorobenzene in chlorine. With the exception of chloroform which occasionally accounted for nearly 1 μg l⁻¹ in water, the levels of the nine compounds in chlorine accounted for less than 0.1 μg l⁻¹ of each compound in chlorinated water from 10 Canadian treatment plants. The occurrence of these nine and 28 additional chlorinated organics previously detected in water supplies was determined by aid of liquid-liquid extraction of water samples. Seven compounds, including chloroform, carbon tetrachloride, trichloroethylene and tetrachloroethylene were detected, usually at levels ranging from 0.1 to 1 μg l⁻¹ in chlorinated water from the treatment plant.     

氯化橡胶的生产与应用

本文着重介绍氯化橡胶的生产方法、市场前景和应用。     

聚丙烯用粘合剂的研究

以氯化聚乙烯接 马来酸酐的接枝物为基料,制得性能优良,使用方便的聚丙烯发泡材料用粘合剂。     

高强度高阻燃矿用电缆CPE护套材料及其制备方法

以氯化聚乙烯为骨架材料,研究了矿用电缆橡皮护套配方,对硫化、补强填充、阻燃、老化和稳定体系进行选择,重点对阻燃和抗撕性能进行讨论,确定了该护套橡胶的优化配方。对橡胶护套性能进行了测定,实验结果表明,护套橡胶性能优良。     

辽河中下游水体中有机氯农药的残留调查

对辽河中下游水及沉积物中有机氯农药 (OCPs)进行了分析测定。由色谱测得的结果表明 ,水和沉积物中所检出的OCPs浓度分别为 7.5 9～ 34.98ng/L和 0 .45～ 7.2 6ng/g。水中OCPs的浓度与其他几个水体水中的浓度接近或略低。毓宝台大桥 (L0 2 )水中六六六 (HCHs包括 )明显高于其他站点 ,且α HCH所占比例与工业产品中该异构体比例基本接近 ,因此 ,在L0 2上游附近应有HCHs污染源存在。各个站点滴滴涕及其降解产物 (DDTs)在水和沉积物两相中的分配不均匀 ,且相差较大 ,说明悬浮物在整个监测河段上的沉降极不均匀     

氯化聚丙烯生产、应用与市场

介绍了氯化聚丙烯国内外生产现状、产品性能和市场状况，重点介绍水相法合成技术进展与产品应用，分析现状并提出一些发展建议。     

CPP/AN/S接枝共聚物合成及粘接性能研究

用丙烯腈 (AN)、苯乙烯 (S)对氯化聚丙烯 (CPP)进行接枝共聚 ,考察了不同条件下制得的CPP/AN/S接枝共聚物胶粘剂对聚烯烃材料的粘接性能 ,结果表明CPP/AN/S共聚物胶粘剂对聚烯烃材料具有较好的粘接性能。