Talk about the application of chlorinated rubber coating in heavy anti-corrosion coating

China Coatings Online News Information
Cui Liang Feng Shaohua (Qingdao University of Science and Technology, Qingdao, Shandong 266041)
Abstract: Chlorinated rubber coatings are one of China's heavy anti-corrosion coatings, playing an important role in the national economic construction. However, due to its own poor environmental performance, with the enhancement of people's awareness of environmental protection, especially in the country introduced a ban on CCl4 production of chlorinated rubber resin today, the development of chlorinated rubber coatings gradually showed signs of decline. This paper analyzes the advantages and disadvantages of the performance of chlorinated rubber coatings, and discusses the future research focus and development direction of chlorinated rubber coatings.keywords: chlorinated rubber coatings, heavy anti-corrosion coating industry, energy conservation and environmental protection
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with China's economic level continues to improve, the development of the machinery industry is getting faster and faster, as the machinery industry must be anti-corruption materials in the field ushered in the development of the peak. A large number of advanced performance, high-quality anti-corrosion products into the market. Chlorinated rubber coatings with its excellent performance by the vast number of users recognized in the fierce market competition stand out. Since the 1960s, chlorinated rubber coatings have been widely used in shipbuilding, containers, water conservancy facilities, petrochemical and power construction as tooth decay coatings, and play an important role in the process of economic development. Data show that chlorinated rubber coatings account for only 2 to 3 percent of the total anti-corrosion coatings market. Many users do not know much about chlorinated rubber anticorrosive coatings, especially a few manufacturers in order to pursue economic benefits, with other low-cost chlorine-containing compounds instead of the normal parts of chlorinated rubber coatings, disrupting the market, but also affected the development of chlorinated rubber coatings. In order to enhance the understanding of chlorinated rubber coatings by the vast number of anti-corrosion coating users, promote the promotion and application of chlorinated rubber coatings, improve the level of development of China's paint industry, the author on the basis of long-term research, the basic performance of chlorinated rubber coatings, classification, application and other content, I hope that the vast number of anti-corrosion coating users can help.1. Chlorinated rubber coating overview
Chlorinated rubber coating is based on natural rubber or synthetic rubber as raw materials produced by the chlorinated rubber resin as a base resin, and then with the corresponding accessories, solvents and made. Chlorinated rubber resin molecular saturation is high, molecular bonds are not obvious polarity, structural regulation, stability is excellent. From the appearance, chlorinated rubber resin is a white powder solid, non-toxic, tasteless, non-irritating. Chlorinated rubber coatings are flexible and widely suitable for use with a wide range of pigments, available as primers, intermediate or finishes. One of the most commonly used is as a paint for use in the matching coating. By modifiing chlorinated rubber resins with other resins, a variety of properties can be obtained or improved for greater coating use.2. Chlorinated rubber coating performance introduction
2.1 advantages of chlorinated rubber coatings
2.1.1 excellent media resistance and weather resistance
For this reason, chlorinated rubber resin lacquer layer has good weather resistance, for water, acid, alkali, salt, ozone and other media resistance is excellent. The passing rate of water and gas is only 10 percent that of alcoholic acid. From the practice of many years of use, chlorinated rubber lacquer layer also has a strong fatty hydrocarbon solvent, refined oil and lubricants tolerance, can be used in wet environment mold treatment, anti-cathode peeling performance is extremely superior.2.1.2 adhesion is good, and other varieties of paint matching good
as a primer used in the green rubber coating for steel materials have a considerable degree of adhesion. As a paint, intermediate paint can be used with epoxy resin, polyurethane and other varieties of primer matching use, the effect is very high. The chlorinated rubber coating is easy to repair and can be repainted with chlorinated rubber coatings, or patched with acrylics, various solvent-based coatings and various anti-fouling coatings.2.1.3 Construction is simple and convenient
chlorinated rubber coating belongs to a single-part coating, film-forming time is very short, the construction speed is fast. Chlorinated rubber coatings on the construction temperature requirements are relatively broad, minus 5 degrees to minus 40 degrees can be constructed. The amount of thinner added during construction is very small, even without thinner, thus reducing the volatility of organic solvents, environmental performance is better. Chlorinated rubber coating can be applied directly to the surface of concrete components, and has better alkali resistance. When used in pipeline operations, the "wet touch wet" method can be used for spraying, greatly improving production efficiency.2.2 Shortcomings and deficiencies of chlorinated rubber coatings
2.2.1 Chlorinated rubber coatings are gray, poor brightness, easy to absorb dust, color is not durable, can not be used for decorative paint.
2.2.2 coating is extremely sensitive to water. In humid environments, heat resistance is significantly reduced. The temperature of thermal decomposition in dry environment is 130 degrees, and the temperature of thermal decomposition in humid environment is only 60 degrees, which leads to the limited use environment of chlorinated rubber coating, and the maximum temperature of use can not exceed 70 degrees.2.2.3 chlorinated rubber coating solid content is low, paint film thickness is thin, to ensure the thickness of paint film, it is necessary to repeatedly spray, affecting production efficiency.
2.2.4 The chlorinated rubber coating is poorly resistant to aromatics and certain types of solvents, and the chlorinated rubber coating cannot be used as an inner wall protection coating in environments where there may be impatient substances such as chemical plant pipes, production equipment, tanks, etc. At the same time, chlorinated rubber coating can not be long-term basis with animal fats and vegetable fats.3. Discussion on the environmental protection of chlorinated rubber
The base resin of chlorinated rubber coatings is produced from natural rubber or synthetic rubber chlorination. CCl3 or CCl4 used in the production process is highly polluting to atmospheric pollution, and CCl3 or CCl4, which escapes in the production process, is the main source of pollution of chlorinated rubber coatings. In order to control pollutant emissions and protect the environment, China's environmental protection department in 2005 and 2010 issued restrictions, prohibition of the use of CCl4 regulations. Affected by this, many domestic enterprises began to implement environmentally friendly chlorinated rubber resin research and development, production projects to improve the environmental performance of chlorinated rubber coatings to meet the new needs of the market.the development direction of chlorinated rubber coatings
4.1 Research on the flexibility of lacquer film
chlorinated rubber coatings are mostly used in anti-corrosion treatment of metal products. Because the volume of metal products changes significantly when the temperature changes, in order to ensure that the quality of the paint film is not seriously affected when the substrate expands and shrinks, the chlorinated rubber coating must have good flexibility to reduce the stress caused by the large expansion of the substrate. At present, the method to improve the flexibility of chlorinated rubber paint layer is mainly to add chlorinated paraffin. From the experimental data, when the total amount of chlorinated wax added to 20% of the chlorinated rubber resin, the film flexibility can reach 1 to 2mm.4.2 Research on modified technology
In order to improve the performance of lacquer film and expand the application range of chlorinated rubber coatings, researchers have carried out a large number of modified studies on chlorinated rubber coatings. Through the use of chlorinated rubber with alcoholic acid, epoxy, epoxy, coal coking asphalt, thermoplastic acrylic and ethylene acetate copolymer resin, made a composite coating, in the paint film flexibility, weather resistance and corrosion resistance has made significant progress, and promoted the development of heavy anti-corrosion coating industry.4.3 On the study of coating solid content
the solid content of chlorinated rubber coating is low, the thickness of paint film is thin, so to meet the thickness requirements of paint film, it is necessary to improve the number of brushes, affecting production efficiency. In order to solve this problem, we must start from the root, improve the coating content.
because the chlorinated rubber coating is difficult to hydrate, in order to ensure the construction performance can only lower the solid content. The current solid content of chlorinated rubber coating is between 35 percent and 49 percent, and the solvent content is high, which affects the environmental performance of the coating. The method of increasing the solid content of chlorinated rubber coating is mainly to adjust the chlorine air infestion time and control the reaction temperature when producing chlorinated rubber resin.5. The future prospect of chlorinated rubber
the proportion of chlorinated rubber coatings in the field of heavy anti-corrosion industry would have been small, with the strengthening of national environmental protection requirements, the development space of chlorinated rubber coatings was further compressed. In terms of performance, chlorinated rubber coatings still have strong vitality. Therefore, it is particularly important to improve the environmental characteristics and overall performance level of chlorinated rubber coatings and enhance their market competitiveness to meet the requirements of modern society. Ship repair, non-standard containers, hydroelectric power engineering, chemical and navigational standard manufacturing and transportation facilities are the main development direction of chlorinated rubber coatings in the future. In the above areas, chlorinated rubber has a strong applicability. With the development of China's economy, the above-mentioned areas will usher in a new peak development, thus bringing a broader market space for chlorinated rubber coatings.conclusion,
, the coating performance of chlorinated rubber coating is excellent, is one of the important anti-corrosion coatings. However, due to environmental protection and other reasons, the market situation of chlorinated rubber coatings is more serious. Improving solid content and improving environmental performance is the main development direction of chlorinated rubber coatings in the future. In addition, through the study of modified, and constantly improve the comprehensive performance of chlorinated rubber coatings, chlorinated rubber coatings to meet market demand, open up the application of an important means. With the further development of China's industry, the role of chlorinated rubber coatings in shipbuilding, chemical industry, water conservancy, power facilities and other aspects will be further strengthened, improve the adaptability and performance of chlorinated rubber coatings in the above-mentioned areas, is an important task for chlorinated rubber coatings manufacturers in the future.Reference
Li Minfeng. Container Coatings and Coating Technology (M).1 Edition. Beijing: Chemical Press, 2002.
, Yin Shaoming, Guo Xiaojun, etc. Development of anti-corrosion coatings for chlorinated rubber for marine use. Shanghai Coatings, 2014 (4): 17-24.