覆铜板用环氧树脂的改性研究进展

本文介绍了环氧树脂在覆铜板中的使用情况和当前国内外对环氧树脂进行改性的研究现状，并介绍了今后覆铜板用环氧树脂的研究方向。     

Kinetics of esterification of cycloaliphatic epoxies with methacrylic acid

The esterification of cycloaliphatic epoxy resins CER I and CER II containing glycidyl and cyclohexane epoxy groups, respectively, as their reactive units was carried out using a 1 : 0.9 stoichiometric ratio of resin and methacrylic acid in the presence of triphenylphosphine. The reaction was performed at 80, 85, 90, 95, and 100°C and it followed second‐order kinetics. The specific rate constants, calculated by regression analysis, were found to obey an Arrhenius expression. Kinetic and thermodynamic parameters, activation energy, frequency factor, entropy, enthalpy, and free energy of the reaction, revealed that the reaction was spontaneous and irreversible and produced a highly ordered activated complex. The reactivity of CER II was found to be higher than that of CER I. The difference in the reactivity of the cycloaliphatic epoxies was explained by proposing a reaction mechanism. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3197–3204, 2002     

板集煤矿立井钢板井壁安全高效施工工艺

介绍板集煤矿立井钢板井壁安全高效施工工艺。     

改性环氧带锈涂料的研究

研究了以改性环氧树脂和聚乙烯醇缩丁醛为基料的钢铁带锈涂料 ,通过对成膜物质、转化剂、渗透剂、颜料等的研究 ,得到了集稳定、转化、渗透为一体的多功能涂料。经过实验测试 ,该涂料的各项性能指标均达到了设计要求 ,并且本工艺方案简单易行、省时高效 ,具有较高的实用价值。     

阳离子交换树脂催化合成十三碳二元酸二乙酯

以强酸性阳离子交换树脂为催化剂,十三碳二元酸与乙醇为原料合成十三碳二元酸二乙酯,考察了影响反应的因素。结果表明:醇酸摩尔比为4∶1,催化剂用量为酸质量的2%,在3分子筛脱水的情况下反应7 h,酯化率达98.4%,并且催化剂可重复使用3次。     

FR-4敷铜板专用四溴双酚A环氧树脂生产工艺优化

介绍了FR 4敷铜板专用CYD 5 2 1 A 80四溴双酚A环氧树脂的性能、生产原理、工艺流程及生产工艺的再优化 ,使产品色度、粘度指标均达到FR 4敷铜板的高标准要求。产品质量稳定 ,为CYD 5 2 1 A 80产品国产化奠定了技术基础。     

Characterization of water penetration inside organic coatings by capacitance measurements

Knowledge of the solution of transport equations allows one to determine parameters which are needed to evaluate the protective properties of organic coatings, particularly the penetration of water inside the coatings. The form of equations representing the processes of transport and their usefulness should be verified by experimental results. The mathematical aspect of the problem is studied in the framework of the theory of partial differential equations. Various methods of solving the equations, the problem of their univocal character, their regularity and properties are considered. The form of a particular solution depends on the imposed problem. The method of determination of the depth of water penetration inside the organic coatings is based upon the solutions of the transport equation. The use of Boltzmann transformation allows the concentration profiles dependent on additional parameters (e.g., temperature) to be represented. The solutions of the diffusion equation for various limiting conditions as well as the methods of determination of diffusion coefficient are presented. The method of evaluation of the depth of medium penetration inside the protective coating in the case of a non-stationary process is described. The use of Boltzmann transformation made it easier to analyse the solution of the diffusion equation. The dependence of the water diffusion coefficient in epoxide-phenol lacquer coatings on temperature was determined and the applicability of Arrhenius' law was found in the temperature range from 303 to 363 K. Knowledge of the diffusion coefficients enabled the time of water penetration inside organic coatings to be determined.     

环氧树脂基阻尼复合材料研究进展

简要阐述了高聚物阻尼材料的阻尼机理,综述了环氧树脂胶液的阻尼性能及其影响因素、纤维增强环氧树脂阻尼复合材料以及无机填料/环氧树脂阻尼复合材料的研究状况,指出了环氧树脂基阻尼材料的发展方向及前景。     

尼龙和聚醋短纤维填充胶料的流变性能

研究了尼龙和聚酯短纤维填充胶料的流变性能，探讨了预处理、温度、短纤维用量等因素对流变性能的影响，分析了短纤维自身性与胶料流变性能之间的依赖关系。     

高效脱漆剂的研制

根据环氧改性的有机硅树脂涂层在有机脱漆剂中的溶胀时间和脱落时间,确定了最佳的脱漆剂配方组成,研究了脱漆剂中各成分对脱漆剂性能的影响。