纤维素改性环氧酚醛树脂与环氧酚醛树脂的阻燃性

用热塑性环氧酚醛树脂与纸泥制备纸泥/环氧酚醛复合材料,将含卤素的阻燃剂三-2-氯乙基膦酸盐和无机阻燃剂(如氢氧化铝)加入到环氧酚醛树脂和纸泥/环氧酚醛聚合物中,用UL-94等级燃烧测试法测定体系的燃烧等级;用热重分析仪和差示扫描量热仪对复合材料进行热分析,研究两体系的阻燃性。结果表明,含磷型阻燃剂和无机阻燃剂对环氧酚醛树脂有阻燃作用,但只有卤化和磷酸化的阻燃剂能增强纸泥/环氧酚醛复合材料的阻燃性,原因是环氧酚醛树脂材料和纸泥/环氧酚醛复合材料的阻燃性取决于本身的热容和热分解行为。     

环氧改性聚氨酯

抗冲击抗反射的塑料镜片及其生产；含陶瓷的树脂组成物用及其制备装饰材料；生产无气泡粘接的含纤维聚合物；聚氨酯和丙烯酸树脂涂层的金属板材；耐光照的人造革片材；一种有空隙可透过空气和液体的纤维复合材料；选择增强地下建筑物的材料；增塑剂对环氧树脂的影响.     

环氧改性聚氨酯

20073185未来汽车设计的材料和结构概念叙述了作业中使用黏合剂连接与机械连接相结合技术的特性，这种混合连接技术在低的热负荷下，能使具有相当不同电化学位的材料之间进行粘结。在铝合金和含碳纤维材料的连接处使用铆钉和环氧树脂或聚氨酯黏合剂相结合，并对其老化与锈蚀特性进行了比较，     

带有环氧基团含氟共聚物对环氧涂料的改性

采用自由基乳液聚合的方法制备带有环氧基团的聚丙烯酸全氟烷基乙酯-甲基丙烯酸缩水甘油酯-苯乙烯无规共聚物P(FA-co-GMA-co-St),用红外光谱(FT-IR)和核磁共振(1H-NMR)对共聚物进行表征并将其用于环氧涂料的改性。XPS测试结果表明,带有环氧基团的含氟共聚物改性环氧涂层经蒸馏水浸泡48 h后接触角下降了15°为116°,表面氟元素含量下降了5.36%;而不带有环氧基团共聚物改性环氧漆膜经水浸泡48 h以后接触角下降了48°为88°,表面氟元素含量下降了7.94%。GMA单体的引入极大地提高了环氧涂层在湿润环境中的疏水性。     

FC环氧模塑料

环氧模塑料是用于电子元器件的封装材料,为发展电子工业的关键微电子化工材料之一。我国大约80%的集成电路、90%以上的分立器件已采用塑料封装.估计“八·五”期间全国的环氧模塑料用量可达到3000吨以上。因而,环氧模塑料已成了电子行业重要     

环氧沥青与环氧沥青混合料的研究及应用

环氧沥青混合料是一种非常好的钢桥面铺装路面磨耗层材料及超重载交通道路的筑路材料，有着广泛的应用前景。本文通过对环氧沥青及沥青沥青混合料的介绍，旨在说明并推广环氧沥青的研究与应用，同时，也为环氧沥青的工程应用提供简单的指导，并指出环氧沥青有着广阔的应用前景。     

环氧玻璃钢板材

二、压制板材前的准备工作 1.玻璃布的去腊处理 ACTT(B)在编织过程中所加石腊润滑剂,必须在浸胶合剂之前除去。将玻璃布放在250℃烘箱中除去挥发物质后,再在350℃马弗炉中灼烧至玻璃布颜色变白为止。 2.胶合剂的配制 将树脂加热至约60℃使之熔融成粘度较低的液体,然后加入估树脂量30％的,预先碾     

环氧改性不饱和聚酯

通过粘度、超声速率及折射率研究氯仿中的环氧／不饱和聚酯混合物的可混性；应用于防水材料的不饱和聚酯树脂的组成；反复使用的聚乙烯基对苯二酯中得到的乙烯基酯存在下的不饱和聚酯压缩特性及固化性能；环氧聚合物改性光敏性不饱和聚酯的制备；耐热双马来酰亚胺改性不饱和聚酯树脂；用于生产储存稳定的不饱和聚酯树脂的含引发剂的微胶囊.     

磷酸酯改性环氧粉末涂料

在环氧粉末涂料中,添加6%的十二烷基磷酸酯与固化剂双氰胺所成的盐(对于钢铁类底材,还应加1/2磷酸酯摩尔数的黄血盐),金属材料可以不经预处理而直接涂膜.所得涂膜具有良好的附着力,高的耐冲击强度和耐老化性能.此类涂料可节省约40%的涂装费.     

纸泥/环氧酚醛树脂复合物与环氧酚醛树脂的阻燃性研究

将含各类阻燃剂加入到环氧酚醛树脂和纸泥/环氧酚醛聚合物中,用UL-94等级燃烧测试法测定体系的燃烧等级,结果表明:TCEP和无机阻燃剂对环氧酚醛树脂有阻燃作用,但卤化和磷酸化的阻燃剂能增强纸浆/环氧酚醛复合材料的阻燃性.用热重分析仪和差示扫描量热仪对复合材料进行热分析研究阻燃机理,结果显示环氧酚醛树脂材料和纸泥/环氧酚醛复合材料的阻燃性取决于本身的热容和热分解行为.     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。