共查询到20条相似文献，搜索用时 0 毫秒
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Joanna Izdebska-Podsiadły Marta Samoraj Konrad Blachowski Leszek Markowski Henryk Godlewski Tomasz Dąbrowa Zuzanna Żołek-Tryznowska 《Polymer Engineering and Science》2021,61(12):3118-3124
This research aims at comparing the interactions between the water-based printing ink and polylactide (PLA) printing base. As a reference base, a polyethylene terephthalate (PET) film was chosen. The wettability of both films was investigated. The Owens–Wendt method was applied to calculate the surface free energy (SFE). The values of SFE and its polar and dispersive components were compared with the surface tension (ST) of the ink and the polar and dispersive components of ST. The wetting envelopes of the investigated PLA and PET films are presented. Finally, the bonding strength between the dried ink layer and the printing base was analyzed. The PET film exhibited higher values of SFE. However, the bonding strength between the dried ink layer and the printing base was higher for PLA films. Our results reveal that PLA films can be an excellent choice as packaging materials, with comparable or even better print quality than conventional fossil-based plastics. 相似文献
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A. O. Baranov T. I. Medintseva L. A. Zhorina A. N. Zelenetskii E. V. Prut 《应用聚合物科学杂志》1999,73(8):1563-1567
The main factors influencing the dispersivity of rubbers (nitrile and ethylene–propylene) in nylon 6 (PA-6) and polypropylene (PP) are investigated. On the basis of an equation, describing the influence of interfacial tension and viscosity ratio of disperse and matrix phases on the average size of dispersed phase particles, analysis of dispergation process in researched blended systems has been conducted. The limits of applicability of a given equation were established. It was shown that the best dispersivity of rubbers in the PA matrix is observed in that case when the viscosity values of initial components of a blend are close to each other. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1563–1567, 1999 相似文献
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聚酯型水性聚氨酯乳液粒径分布及乳液膜耐水性的研究 总被引：2，自引：0，他引：2
用自制的聚酯伯二醇分别与四甲基苯二甲基异氰酸酯(TMXDI) 或异佛尔酮二异氰酸酯(IPDI)为主要原料,二羟甲基丙酸(DMPA)为亲水单体,水合肼为扩链剂,在DMPA投料相同的条件下,采用预聚体分散法,制备了TMXDI预聚体和IPDI预聚体的水性聚氨酯乳液.利用Autossizer Loc粒度分布仪测定了两种类型乳液的粒径分布.结果表明:TMXDI预聚体与IPDI预聚体水性聚氨酯乳液粒径分布不同,黏度较低的TMXDI预聚体,乳液粒径分布为单峰,均比黏度较高的IPDI预聚体乳液的粒径分布小;对于TMXDI预聚体水性聚氨酯乳液,随预聚体黏度的降低,乳液粒径分布变窄,说明预聚体的黏度对乳液的粒径分布有影响.通过乳液膜耐水性的对比,乳液膜的耐水性与聚酯伯二醇的结构有关. 相似文献
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油品运动粘度是石油产品重要的质量指标之一。油品粘度测定的准确性要求也较高。运动粘度测定过程中受较多因素影响,根据笔者多年的分析测试经验,其中最主要的影响因素为:油品在毛细管中的流动时间、水浴温度以及粘度计的位置。通过实验测试,考察这3个因素的影响结果,并得出结论。 相似文献
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Moisture content is unevenly distributed and hard to measure when agricultural products are dried using microwave drying. A low-field nuclear magnetic resonance/imaging (NMR/MRI) and microwave vacuum drying (MVD) combination equipment was developed. The residual moisture content, distribution, and state of water (free, immobilized, and bound) in fresh corn kernels during MVD were quickly measured in real time. NMR results indicated that the amplitude of free and immobilized water decreased very rapidly at the early stage of MVD, while the amplitude of bound water experienced a similar rapid decrease at the last stage. MRI results indicated that the moisture content was always distributed unevenly during MVD, especially at the early stage. The moisture distribution tended to become uniform when drying progressed and the bound water became dominant. The residual moisture content of corn kernels and integral (total) amplitude of NMR were found to fit well with a linear model (R2?>?0.991, P?相似文献
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Automat layout detection of color yarns is necessary for weaving and producing processes of yarn‐dyed fabrics. This study presents a novel approach to inspect the layout of color yarns of double‐system‐mélange color fabrics automatically, which is Part III of the series of studies to develop a computer vision‐based system for automatic inspection of color yarn layout for yarn‐dyed fabrics. The inspection of single‐system‐mélange color fabrics has been realized in Part I of the series of studies. Integrating the projection‐based region segmentation method proposed in Part I and the FCM‐based stepwise classification method proposed in Part II, the proposed approach is composed of three steps: (1) fabric region segmentation, (2) fabric region selection, and (3) layout of color yarns recognition. In the first step, the fabric regions are segmented by the projection‐based region segmentation method. In the second step, the reasonable fabric regions are selected by analyzing their color histograms and comparing their weft color's frequency. In the third step, the layout of color yarn is recognized by the FCM‐based stepwise classification method, and the precise layouts of color warps and wefts are produced. The experimental analysis proved that the proposed method can recognize the layout of color yarns of double‐system‐mélange color fabrics correctly by testing four different color fabrics and three pieces of same yarn‐dyed fabrics. © 2016 Wiley Periodicals, Inc. Col Res Appl, 42, 250–260, 2017 相似文献
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根据热固性粉末涂料研制、生产及施工应用中的一些问题,对当前国内粉末涂料生产控制及优化配方筛选,介入基础理论研究及实际应用,同时在应用施工中技术操控对施工质量的影响及解决途径进行了探讨。 相似文献
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对2013年南方某城市供水管网各采样点数据进行整理,根据管网的拓扑结构选取其中具有代表性的14个采样点进行水质调查分析,阐明该区管网的水质现状。分析所选用的水质因子为浊度、余氯、p H、耗氧量和菌落总数,并采用Pearson和Spearman相关性分析法进行分析。结果表明不同采样点水样的浊度、p H和耗氧量相差不大,而余氯则与菌落总数呈显著的负相关关系;耗氧量季节性变化最明显,与水温呈显著地负相关关系;管网中水的p H受原水p H影响,呈折线下降趋势;管网末梢与供水交界区域水质稳定性差,需加强监控。 相似文献
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A novel water‐soluble polymer was prepared by copolymerization and sulfomethylation using acrylamide (AM) and N‐allylbenzamide (NABI) as raw materials under mild conditions. The effects of ratio of AM to NABI, initiator concentration, reaction temperature, pH, and monomer concentration on the copolymerization were studied. The sulfonates copolymer was characterized by infrared (IR) spectroscopy, 1H NMR spectroscopy, elemental analysis, and atomic force microscopy (AFM). It was found that the sulfonates copolymer could achieve up to 25%, 30% retention rate of the viscosity at a high temperature (120°C) and a vigorous shear condition (1000 s?1). It was also found that the sulfonates copolymer had moderate salt tolerance (NaCl, CaCl2, and MgCl2·6H2O) and its viscosity could be restored to the original value when the shear rate changed from 170 to 510 s?1 and 510 to 170 s?1. At last, the enhanced oil recovery (EOR) of the sulfonates copolymer was tested by core flood, and with up to 10.6% EOR was afforded in presence of 5000 mg/L NaCl brine at 60°C. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
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影响煤浆质量的因素主要有:煤种的选择,即煤化程度、氧碳比、内水含量、煤表面孔隙特性、灰分、哈氏可磨性等对成浆性能的影响;粒度级配;制浆工艺与设备的选择,包括破碎方式和给煤粒度、磨机类型、衬板材质、筛网型式;添加剂的选配;制浆水质;搅拌方式等。本文对各因素进行分析,以供同类型装置参考。 相似文献
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矿渣微粉颗粒群几何特征的图像分析 总被引：7，自引：0，他引：7
以QUANTITATIVE60 0图像分析仪为测试手段 ,由矿渣微粉的二维截面图像推断出其三维结构特征 ,同时获得矿渣微粉试样的级配 (大小、分布曲线 )、颗粒形状因子 (圆度、长短径之比 )等一系列颗粒群特征三维参数。结果表明 :①矿渣微粉颗粒群的累计质量 粒度分布符合Rosin Rammler分布和修正的Gauss分布 ,其中Rosin Rammler分布可以得到很高相关性的拟合直线 ,而Gauss分布能直观地反映粉体颗粒群的分布情况 ;②矿渣是颗粒状粉体 ,用圆度 粒度、长短Feret径之比 粒度、CurveLength 粒度和CurveWidth 粒度分布来描述矿渣微粉颗粒群的形状特征具有较好的规律性。矿渣微粉颗粒群的细组分更接近于球体 ,而粗组分更接近于长方体 相似文献
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为提高水焦浆的稳定性,采用A、B两种稳定剂制备水焦浆,考察对比了2种稳定剂对水焦浆的表观黏度和析水率的影响。结果表明,A物质的添加量为0.3%时,随着浓度的增加,流动性逐渐变差,表观黏度上升,由873 m Pa·s增至1 039 m Pa·s,析水率由11.61%降至8.57%。B物质的添加量为0.3%时,随着浓度的增加,流动性逐渐变差,表观黏度由891 m Pa·s增至1 187 m Pa·s,析水率逐渐下降,由6.30%降至3.45%。2种添加剂均可提高水焦浆的稳定性。随着2种稳定剂添加量的增加,水焦浆黏度有所增加,析水率逐渐降低,即稳定性增加。添加0.3%的B物质时浆体的黏度低于添加0.6%的A物质的水焦浆黏度,而浆体的析水率也优于添加0.6%的A物质水焦浆的析水率,因此B物质对稳定性的提升效果要优于A物质。 相似文献
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We have developed a zero‐shear viscous model in terms of temperature‐ and pressure‐dependent hole fraction computed from Simha‐Somcynsky Hole Theory. This model successfully interprets the viscosity data of PS, PP, and ABS as a function of hole fraction for a broad range of temperature and pressure. We have also introduced and discussed a new term: Viscoholibility; the derivative of logarithm of viscosity with respect to hole fraction. When the hole fraction takes highest available value, the viscoholibility approaches asymptotically to a constant value by which the viscosity changes linearly with the hole fraction. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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波式倾斜型太阳能蒸馏水器的试验研究 总被引：1，自引：0，他引：1
该试验是利用太阳能为热源,采用水汽饱和冷凝蒸馏提纯新工艺而设计的太阳能蒸馏水嚣。具有水质纯、出水量大、结构简单、造价低廉的突出优点。 相似文献
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The copolymers containing N‐vinyl‐2‐pyrrolidone (V) and methyl methacrylate (M) units of different compositions were synthesized by free radical bulk polymerization. The copolymer composition of these copolymers was determined by CHN analysis. The distortionless enhancement by polarization transfer (DEPT) technique was used to resolve the methine, methylene, and methyl resonance signals in the V/M copolymer. Comonomer reactivity ratios were determined by the Kelen–Tudos (KT) and nonlinear least‐square error‐in‐variable (EVM) methods. 1H–13C Heteronuclear shift quantum correlation spectroscopy (HSQC) and 1H–1H homonuclear total correlation spectroscopy (TOCSY) spectra were used for the resolution of the proton nuclear magnetic resonance (1H NMR) spectrum of the V/M copolymers. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1328–1336, 2002 相似文献
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针对独山子炼油厂循环水存在的问题,采取一系列的改进措施,诸如缓蚀阻垢剂评选、杀菌剂及投加方案的改进、水冷器工艺改进、旁滤系统改造、物料泄漏处理方法的创新和加强系统科学管理等,取得明显的效果和可观的经济效益。同时这些经验也可为其他炼油厂循环水水质改进提供借鉴。 相似文献