耐磨紫外光固化水性木器涂料的研究

以水溶性聚氨酯丙烯酸酯为基础配制紫外光固化水性木器涂料,加入纳米氧化铝,考察了体系黏度、二氧化硅、偶联剂对纳米氧化铝分散稳定性的影响,测试了其附着力、硬度、光泽度、耐水性、耐醇性和耐磨性等性能。结果显示,该涂料具有良好的耐水性、耐醇性和耐磨性。     

信息荟萃

2006201纳米级助剂Byk-Chemie与美国Nanophase Technologies Corporation合作推出若干纳米级助剂,其中有纳米氧化铝、纳米二氧化硅等,它们均能改善涂料的耐划伤性,适用于所有涂料配方,还包括UV固化体系。其牌号有Nanobyk-3602、Nanobyk-3610和Nanobyk-3650等。这类纳米级助剂最     

耐磨涂料

耐磨损和耐化学性好的复合材料、硅氮烷或硅氧烷涂料溶液及用该溶液制备的材料,板材用耐磨损装饰涂料,含硅烷改性氧化铝纳米粒子的耐划伤涂料,含PTFE、二硫化钼和聚酰胺酰亚胺树脂的汽车发动机活塞外缘部分用涂料组合物，长距离输水管线用耐磨环氧涂料的研究[编者按]     

木器涂料

木质底材用具有平衡的耐裂纹性和硬度的反应性热熔融型涂料组合物；含丝粉和氧化铝粉末的触感好的涂料、其涂装产品及涂装木器；透明阻燃硝基木器漆的研制；[编者按]     

多功能水性环氧自流平地坪涂料的配方设计

在普通水性环氧自流平地坪涂料的基础上,通过添加7%的纳米氧化铝和适量的高沸点溶剂和乳化剂,研制出一种水性环保耐磨以及耐油污涂装的多功能水性环氧自流平地坪涂料,其耐油污涂装、耐磨性能优异。     

水性建筑涂料不同性状涂膜耐沾污性研究

选取不同水性建筑涂料对其耐沾污性进行研究。结果表明,涂膜的粗糙度、吸水率、硬度、静水接触角对涂膜的耐沾污性有重要影响,并简要分析了涂膜耐沾污的原理,为耐沾污水性涂料的研制开发提供科学依据。     

不同色系儿童房装饰用内墙涂料耐污渍性试验方法改进探究

目前内墙涂料的耐污渍性能主要通过反射系数来评判,但不适用于不同色系儿童房装饰用内墙涂料。实验通过检测添加不同颜色色浆的儿童房装饰用内墙涂料的耐污渍性,探索了不同色系涂料色彩的保留性和持久性;通过引入色差表征涂料及其老化后的耐污渍性,填补了目前不同色系儿童房装饰用内墙涂料耐污渍性检测的空白,为完善涂料耐污渍性测定方法提供参考。     

全氟碳涂层的耐沾污性能测试研究

在参考相关文献中关于涂层耐沾污测试方法的基础上,结合国内涂层的耐沾污性测试标准,对有机硅乳液涂料(A)、丙烯酸酯乳液涂料(B)和全氟丙烯酸酯乳液涂料(C)进行耐沾污性测试对比,结果表明:总体耐沾污性顺序为C>A,B,同时证明了全氟丙烯酸酯涂料具有优秀的耐水性、耐酸碱性和耐沾污性能。     

氟树脂改性丙烯酸树脂

美加涂料红狮水性漆（北京）有限公司的李学燕研究了氟树脂与丙烯酸树脂以1：1的比例混溶配制的涂料的性能，以及该涂料与纯氟树脂涂料和纯丙烯酸涂料的物理性能、耐化学品性、耐沾污性、耐紫外线性的试验比较。     

内墙涂料耐沾污性标准的方法研究

为了评定内墙涂料抵抗常见生活污渍污染的能力,通过研究国外建筑涂料耐沾污性能标准,针对国内的实际情况,采用涂膜污渍去除率评价的方法,并依据大量实验结果选定6种污渍(食用醋、红茶、蓝黑墨水、水溶黑色素、醇溶黑色素、凡士林炭黑混合物)作污染源,用浸渍法或刮涂法将其附着在涂层试板上,经中性洗涤剂擦洗后,通过测定样板无污渍污染和擦洗污染污渍后反射系数的变化评定涂层试板的耐沾污性。该方法可以判断内墙涂料的耐沾污性能优劣,并具有可操作性和重复性,弥补了国内内墙涂料耐沾污性检测标准的空白。     

影响氮化硅浆料流变特性的因素

通过对影响氮化硅浆料流变性因素的研究发现：不同的氮化硅粉体具有不同的等电点（ｉｓｏｅｌｅｃｔｒｉｃ ｐｏｉｎｇ,简称ＩＥＰ）。分散剂的引入明显改善浆料的流动性。对于粉体Ａ,当分散剂用量达１．２ｗｔ％时浆料具有最佳的流动性。颗粒尺寸及其形貌对浆料的流动性均有较大的影响：颗粒尺寸越大,颗粒形貌越不规则,浆料的流动性就越差。     

液-固混合悬浊液的压力雾化（Ⅱ）实验与结果

研究了混合液压力、固体质量分数、固体微粒直径、微粒密度对雾滴的体积-表面积直径（d₃₂）的影响.在实验中采用三维激光相位多普勒LDV/APV测试系统测定了最大概率分布的雾滴直径（d₃₂）,使用高速摄像仪记录了雾化的过程.研究发现混合液的压力和固体微粒密度对雾滴直径（d₃₂）的影响呈非单调性,雾滴直径（d₃₂）随其增大先减小、再增加;而雾滴直径随固体微粒的直径、混合液固体质量分数的增加而增大.实验结果与数学模型能较好地吻合,可为工业性设计提供理论依据.     

聚四氟乙烯主要成型制品及其生产工艺

介绍了聚四氟乙烯悬浮细粉、分散细粉和分散乳液的主要成型制品、技术指标和生产工艺等,此外还对聚四氟乙烯悬浮细粉填充改性的一般方法进行了举例说明。同时指出,增加聚四氟乙烯的品种以及对现有的品种进行系列化将是今后我国科研工作者的一个重要研究方向。     

Solid-liquid separation in suspension atomization

The aim of this paper is to define the conditions controlling the fragmentation process within the atomization of a suspension. Correlations for the droplet diameter of a suspension spray generated by a twin-fluid nozzle have been derived. Two separate regimes in suspension atomization have been identified with respect to the solid particle size. The atomized droplets from suspensions containing relatively fine solid particles are suspension droplets (containing liquid and solid particles). In this case a correlation for the drop size distribution in the spray of a twin-fluid nozzle has been deduced. Droplet size measurements in the suspension spray with varying solid particle sizes showed that when the suspended solid particle size exceeds a critical value, solid particles and liquid will be more and more separated. This effect is indicated by a bimodal size distribution in the suspension spray. It is shown that complete solid-liquid separation in the suspension spray may be achieved, where the pure liquid drops are significantly smaller than the separated solid particles. The critical process conditions where the solid-liquid separation process is found will be derived. Depending on the operating conditions of the atomizer, the resulting pure liquid droplet size is equal or less than the hydraulic diameter.     

电石渣硅铁用作重介质悬浮液加重质的研究

电石渣的排放及贮存量日益递增,电石渣硅铁的资源化利用也成为亟待解决的难题。为实现电石渣硅铁的高值化应用,以干法电石渣中分离出的磁性硅铁为加重质配制重介质悬浮液,并探究了悬浮液密度、黏土含量和硅铁粒度等因素对其粘度及沉降特性的影响。结果表明,增大悬浮液密度或黏土用量以及减小硅铁粒度均会使悬浮液的粘度提高,从而使加重质颗粒的沉降速度下降,稳定性得到提升。此外,为了进一步验证该悬浮液体系用于实际分选的可行性,将不同密度的悬浮液用于选煤浮沉试验分选混合煤样,在密度为1.30 g/cm³和1.40 g/cm³的重介质悬浮液中,浮煤产率高且灰分含量较初始煤样大幅降低,说明该悬浮液体系具有良好的分选性能。     

无外加表面活性剂的苯乙烯悬浮聚合

针对传统悬浮聚合制备聚苯乙烯颗粒粒径分布宽、有效粒子收率低的问题,采用过硫酸铵/磷酸钙复合分散剂体系,在无外加表面活性剂情况进行苯乙烯悬浮聚合,制备了聚苯乙烯珠粒。通过对聚合稳定性、聚苯乙烯珠粒粒径及分布的测定与分析,考察了磷酸钙、过硫酸铵的用量及比例对悬浮聚合的影响,并分析了过硫酸胺对悬浮聚合的分散稳定机理。结果表明,当过硫酸铵和磷酸钙的用量分别为单体质量的0.01%和1.00%时,悬浮聚合体系稳定,得到的粒子透明性好,平均粒径为1.35 mm,粒径分布窄;通过改变过硫酸铵和磷酸钙的用量,可以调节聚苯乙烯珠粒的平均粒径。     

Shrinkage and dimensional accuracy of porous ceramics derived from capillary suspensions

Shrinkage and dimensional accuracy are of particular importance for industrial material production. High dimensional accuracy directly lowers finishing works and cost. Capillary suspension processing is a novel, easy method to produce highly porous ceramic materials. Their shrinkage and shape accuracy is investigated during processing using a laser microscope. The total shrinkage is reduced by 20% for capillary suspension compared to pure suspension. This results from an increase in linear shape accuracy for top radii as well as height. The linear shape accuracy is increased by 6% in top radius and by 16% in height by using the capillary suspension phenomenon. We also show that this capillary suspension method is applicable for continuous shaping processes, like extrusion. The combination of an easy, robust processing route with known dimensional accuracy and applicability for continuous shaping processes makes this capillary suspension processing route highly desirable for industrial processes.     

悬浮进样—石墨炉原子吸收法测定鸡全蛋粉中的铜、铅和镉的研究

直接悬浮进样石墨炉原子吸收法测定铜、铅和隔,样品不用消化,极大地简化了步骤,避免了样品的污染和损失。优化了悬浮液的配方,使鸡全蛋粉的水悬浮液均匀稳定。该法快速、简便、准确,结果满意。     

SUSPENSION CHARACTERISTICS OF LARGE CYLINDERS IN AGITATED TANKS

Considerable research has been done concerning solid suspension in agitated tanks. Typically, such studies concern slurries or granular material, such as sand, and involve minimum suspension rotational speeds or suspension homogeneity.

The objectives of this work are similar, however we are concerned with rather large cylinders of varying length to diameter ratios. The work involves: 1) the determination of minimum impeller rotational speed for suspension similar to criterion used by Zwietering, 2) the measurement of suspension heights and times, 3) an investigation into whether the correlations by Zwietering, Kolar and Rieger et al., can be used for predicting minimum suspension rotational speed and 4) weight fraction effects on minimum suspension rotational speed.     

SUSPENSION CHARACTERISTICS OF LARGE CYLINDERS IN AGITATED TANKS

Considerable research has been done concerning solid suspension in agitated tanks. Typically, such studies concern slurries or granular material, such as sand, and involve minimum suspension rotational speeds or suspension homogeneity.

The objectives of this work are similar, however we are concerned with rather large cylinders of varying length to diameter ratios. The work involves: 1) the determination of minimum impeller rotational speed for suspension similar to criterion used by Zwietering, 2) the measurement of suspension heights and times, 3) an investigation into whether the correlations by Zwietering, Kolar and Rieger et al., can be used for predicting minimum suspension rotational speed and 4) weight fraction effects on minimum suspension rotational speed.