Coal Tar Enamel Research

Coal-tar enamel is both an old pipe coating material and a new one. The history of its applications is over a century. Because coal-tar enamel has unique physical chemistry performance and economy practicability, such as good adhesion, excellent water resistance, high electrical resistivity, resistance to root penetration and so on. This shows that coal-tar enamel will be widely used in the pipeline protection area of our country in the future.The coal-tar enamel is a kind of product that is restricted by the source of the raw materials. Not all of the country can produce coal-tar enamel with their own raw materials. So, to produce coal-tar enamel with domestic raw materials will be deeply influnce in our pipeline protection area.Though coal-tar enamel has been used widely, there are some problems in industrialization manufacture. Material choice, manufacture and applications rest on the experience. The research of the volatility, toxicity and disposal of the smoke of coal-tar enamel has not been taken out deeply and by the members inside and outside the country. And the physical chemistry performance has no analysis in theory and scientific measure standard. So, the industrialization manufacture and applications of coal-tar enamel are limited and difficult to meet the yield needs. To solve these problems, this article studies the performance of coal-tar enamel. The tasks finished are listed as follows:1. Start with the production and treatment of coal-tar enamel sample and the coal-powder's function, it is studied that how to improve the quality of coal-tar enamel. This provides the choice of coal-powder material with academic basis, avoids the blindness of manufacture and enormously enlarges the source of coal powder.2. The thermal and rheological property is studied and the relations between specific heat, specific gravity, viscosity, heat conduction factor and temperature or shears are determined. These provide some necessaryparameters for the equipments' design of coal-tar enamel's producing and direct the production.3. The volatility of coal-tar enamel is one of the important performances that can affect the applied area of this coating. After a series of experiments, this paper educes a conclusion about how the flue dust of coal-tar enamel working on the organism. This conclusion is very meaningful for the coal-tar enamel's general application.4. Flue dust treatment is a necessary step in the processing of coal-tar enamel. Based on the research of the experiments, this paper has designed a new industry device. This device has been proved by field practice that each target of the product has reached the requirement of environment criterions.5. The experiments with the influence on the physical performance of coal-tar enamel's heat-stability, new-old enamel ratio, the temperature of the steel tube and the coating temperature has been done. The research result can coach the perform and application of coal-tar enamel and it is great meaningful to improve the integrate performance and enlarge the apply area of coal-tar enamel.In one word, the research on coal-tar enamel in this paper has solved presently actual problem of its industry production and application. It has been taken to fact that we can produce good coal-tar enamel by the raw materials made in our country, which is widely used in 4000km (more than 20%) pipeline. The producing and coating technology of coal-tar enamel has been improved and developed. The process has been advanced, the quality has been improved, and the environment problem has been solved. So the urgent technique problem in the industrialized production of coal-tar enamel has been solved and the whole technique level in industrialized production and application has been improved. The technical target of coal-powder has been firstly ensured in the world in this paper. The influence of the coal-tar enamel flue dust to the organism has been discussed in this paper. Anyway, the results will be actual meaningful to the coal-tar enamel's p...