桉木单板/聚氯乙烯膜复合材料的制备工艺

以人工林速生材桉木为基材,聚氯乙烯膜代替传统胶黏剂制备木塑复合材料,解决了甲醛释放、白色污染等问题。采用热压—冷压工艺,以热压温度、时间及塑料添加量3个因素为自变量,胶合强度为响应值,通过响应面分析确定了最优生产工艺;并采用扫描电子显微镜观察其界面形态,即热压温度为183℃,热压时间为452 s,塑料添加量为320 g/m~2。试验表明:桉木单板/聚氯乙烯膜制备木塑复合材料工艺具有可行性,其胶合强度达1.14MPa,满足GB/T 9846—2015标准中Ⅱ类胶合板的要求。     

埋地塑料排水管发展浅析

本文介绍了埋地硬聚氯乙烯排水管道的特点及现状,并且分析了其今后的发展前景和趋势,供设计施工参考.     

木质素/PVC复合材料的研究与发展

阐述了将木质素磺酸盐与聚氯乙烯(PVC)熔融挤出制备木质素/PVC复合材料。该产品物理力学性能优于普通人造板,无甲醛释放,可循环再利用,有很好的环境效益。     

PVC双壁波纹排水暗管开孔率试验研究

采用一维渗流试验装置研究了ＰＶＣ双壁波纹管用作农田排水时的适宜开孔率，试验表明：ＰＶＣ双壁波纹管用作农田排水暗管时开孔率不必要求过高，控制在２．５％￣３．０％之间即可满足生产要求。     

塑料暗管排降条件下麦田土壤水分变化规律模拟

应用非饱和土壤水分运动原理，对塑料暗管排水条件下分层土壤的水分运动进行了数值模拟，建立了数学模型。结果表明，模型计算的土壤水分分布结果和田间实测的土壤部面水分数据一致，应用该模型可以确定出试验区在一定外界气象条件下不同地下水降落速度时农田的受渍情况。     

Life cycle assessment of windows for the North American residential market: Case study

Abstract

A life cycle assessment (LCA) of residential windows was conducted to evaluate the environmental impacts of those made with aluminum-clad wood, polyvinyl chloride (PVC) and fiberglass frames for sale in North America. The LCA was a case study in which specific-site data were used for the manufacturing stage of each window, while published data were adapted to complete the life cycle inventories using Sima Pro software. These inventories were grouped into impact categories and scaled based on IMPACT 2002+ version 2.1 characterization and damage factors. The damage modeling indicated that the life cycle impacts are dominated by the combustion of non-renewable energy resources. The PVC life cycle used the most non-renewable energy and caused the most damage owing to that window's shorter service life. The disposal of aluminum cladding in the municipal waste stream caused greater aquatic ecotoxicity for the wood window. The sensitivity analysis revealed that replacing the virgin material in aluminum cladding with recycled content improved the life cycle impacts of the wood window. Using fiberglass or PVC to clad the wood window also improved the environmental performance. Other potential improvements to the life cycle impacts of the three windows include improving energy efficiency, particularly during the secondary manufacturing.     

油菜秆绿色装饰材料的初步研究

对油菜秸秆粉替代木粉与聚氯乙烯复合制备木塑复合材料进行了研究,在单因素试验基础上通过正交试验初步得到油菜秸秆粉与聚氯乙烯置备木塑复合材料的最佳条件.试验结果表明:经过碱处理的秸秆粉可以增强片材的弯曲强度,但是碱浓度过高反而会降低片材的弯曲强度;当PVC份数为240份、DOP含量为30%、稻壳填料配比3:2和加工温度170℃时,所制得的复合材料性能最佳:经钛酸酯偶联剂处理的改性秸秆粉能增强PVC板材的弯曲强度.     

茶碱PVC膜选择性电极的研究

In this Paper, PVC membrane Selective clectrodes are prepared for theophylline which are based on its ion-pair complexes with hexadecylt- rioctylammonium iodide (HTOA) , hexadecyltributyl-ammonium iodide (HTBA), hexadeeyltriophenylphosphonium iodide(HTPP), triphenyloctylphosphonium leoide(TPOP) and tri(p-tolyl) butylphosphonium iodide(TPTBP).The effects of the nature of associate counterions, the plastieizers and their concentrations in the membrane phase have been studied. The electrode based on theophylline-HTOA membrane has a sub-Nernstian response range from 2.0×10~2—6.3×10~(-5)mol/L,with an average slope of 48.0mV/pC. The limit of detection is 8.7×10~(-6)mol/L. The electrode responses were not affected by pH in the range 10-12. The potentiometric selectivity coefficients of various common inorganic and organic ions including those which are similar to theophylline in structure were determined. The Na_2CO_3-Na_2B_4O_7 buffer of pH 11 is selected as the background solution for potentiometric measurements. The electrode was used for determining the theophylline in pharmaceutical preparations with satisfactory results.     

PVC双壁波纹排水暗管滤水结构试验研究

为降低暗管工程施工成本,在实验室利用模拟实验装置研究了PVC双壁波纹排水暗管的滤水结构。试验表明在粉砂、粉质壤土等弱透水性介质中,PVC双壁波纹排水暗管的开空率达到1．6％就可满足农田地下排水要求,砂砾滤料的铺设厚度不应于4．5cm,生产实际中砂砾滤料的铺设厚度宜取9～12cm。     

刨花板家具部件的封边剥离性能的研究

采用全面试验设计和实时分析,对刨花板家具部件的封边剥离性能进行了研究。结果表明:PVC厚度对剥离强度的影响极显著,PVC厚度增加,剥离强度明显增大;剥离强度的平均值高于最小值的0.2～0.5倍;0.45mmPVC,16mm刨花板基材,在12mm/min剥离速度下,剥离强度最小,其值仅为2 686N/m;PVC越厚,基材越易发生折断;PVC厚度0.45mm的剥离破坏主要发生在刨花板与热熔胶之间,PVC厚度1mm的剥离破坏主要发生在PVC与热熔胶之间,2mm厚PVC封边条尚未开始剥离,刨花板基材即被折断;25mm厚刨花板基材的剥离强度波动差值低于16mm厚刨花板基材剥离强度波动差值。