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chlorinated rubber coating

With the continuous improvement of China's economic level, the development of the machinery industry is getting faster and faster, and the field of anti-corruption materials necessary for the machinery industry has also ushered in the peak period of development. A large number of advanced performance, good quality anti-corrosion products began to put into the market. Chlorinated rubber coating has been recognized by the majority of users for its excellent performance and stands out in the fierce market competition. Since the 1960s, chlorinated rubber coatings have been widely used in shipbuilding, containers, water conservancy facilities, petrochemical and power construction as a supporting coating for tooth decay, and play an important role in the process of economic development.
Relevant data show that chlorinated rubber coatings account for only two to three percent of the overall anti-corrosion coatings market. Many users do not have a deep understanding of chlorinated rubber anticorrosive coatings, especially a small number of manufacturers in order to pursue economic interests, with other low-cost chlorine compounds to replace the normal components of chlorinated rubber coatings, disrupting the market, but also affected the development of chlorinated rubber coatings. In order to improve the understanding of the majority of anti-corrosion coating users of chlorinated rubber coating, promote the promotion and application of chlorinated rubber coating, and improve the development level of China's coating industry, now the author on the basis of long-term research, the basic properties of chlorinated rubber coating, classification, application and other content are introduced, hoping to help the majority of anti-corrosion coating users.

Overview of chlorinated rubber coating

Chlorinated rubber coating is made of chlorinated rubber resin produced by natural rubber or synthetic rubber as raw material as matrix resin, and then with corresponding auxiliary materials and solvents. Chlorinated rubber resin has high molecular saturation, no obvious polarity of molecular bonds, regular structure and excellent stability. From the appearance point of view, chlorinated rubber resin is a white powder solid, non-toxic, tasteless, no irritation. Chlorinated rubber coatings can be used flexibly, with a wide range of applications, and can be used with a variety of pigments as primer, intermediate paint or top paint. Among them, the most used is used as a topcoat for matching coatings. By modifying the chlorinated rubber resin with other resins, a variety of properties can be obtained or improved to achieve greater coating effect.

the properties of chlorinated rubber coating

1. Advantages of chlorinated rubber paint

1.1 Excellent medium resistance and weather resistance
After the chlorinated rubber coating is formed, the molecular bonds of the resin in the paint layer are firmly bonded, and the molecular structure is extremely stable. For this reason, the chlorinated rubber resin paint layer has good weather resistance and excellent resistance to water, acid, alkali, salt, ozone and other media. The permeability of water and gas is only ten percent of that of alkyd substances. From the perspective of many years of use practice, the chlorinated rubber paint layer also has a strong resistance to aliphatic solvents, refined oil and lubricating oil, and can be used for anti-mold treatment in humid environments, and the resistance to cathode stripping is extremely superior.
1.2 Good adhesion, good compatibility with other kinds of coatings
The green rubber coating used as the primer has a considerable degree of adhesion to the steel material. As a top paint, intermediate paint can be used with epoxy resin, polyurethane and other varieties of primer, the effect is very high. Chlorinated rubber coating is easy to repair, you can use chlorinated rubber coating to repaint, you can also use acrylic, various solvent-based coatings and all kinds of anti-fouling coatings for brushing repair.
1.3 Simple and convenient construction
Chlorinated rubber coating is a single component coating, the film formation time is very short, the construction speed is fast. The requirements for construction temperature of chlorinated rubber coating are relatively broad, and can be constructed from -5 degrees to 40 degrees above zero. The amount of diluent added during construction is very small, and even no diluent can be added, which reduces the volatilization of organic solvents and has good environmental performance. Chlorinated rubber coating can be directly applied on the surface of concrete members, and has good alkali resistance. When used in assembly line operations, the "wet against wet" method can be used for spraying, greatly improving production efficiency.

2. Shortcomings and shortcomings of chlorinated rubber coating

2.1 Chlorinated rubber coating dark color, poor brightness, easy to absorb dust, color is not durable, can not be used for decorative paint;
2.2 The heat resistance of the coating is extremely sensitive to water. In humid environments, heat resistance decreases significantly. The thermal decomposition temperature in the dry environment is 130 ° C, and the thermal decomposition temperature in the humid environment is only 60 ° C, which leads to the limited use environment of chlorinated rubber coating, and the maximum use environment temperature cannot exceed 70 ° C.
2.3 Chlorinated rubber paint has low solid content and thin film thickness. To ensure the film thickness, it must be sprayed repeatedly, which affects the production efficiency;
2.4 Chlorinated rubber coating has poor tolerance to aromatics and some kinds of solvents. Chlorinated rubber coating cannot be used as inner wall protection coating in environments where there may be intolerant substances, such as chemical pipeline, production equipment and storage tanks. At the same time, the chlorinated rubber coating can not be long-term basis with animal fats and vegetable fats;

the development direction of chlorinated rubber coating

1. Research on the flexibility of paint film Chlorinated rubber coatings are mostly used for anti-corrosion treatment of metal products.

Since the volume of metal products will change 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 contracts, the chlorinated rubber coating must have good flexibility to reduce the stress generated when the substrate is greatly expanded. At present, the main method to improve the flexibility of chlorinated rubber paint is to add chlorinated paraffin. From the experimental data, when the total amount of chlorinated paraffin reaches 20% of chlorinated rubber resin, the film flexibility can reach 1 ~ 2mm.

2. Research on modification technology
In order to improve the properties of paint film and expand the application range of chlorinated rubber coatings, researchers have carried out a lot of modification studies on chlorinated rubber coatings. By using chlorinated rubber with alkyd, epoxy ester, epoxy, coal tar pitch, thermoplastic acrylic acid and vinyl acetate copolymer resin, composite coating has made obvious progress in the flexibility of the paint film, weather resistance and corrosion resistance, and promoted the development of heavy corrosion protection coating industry.

3. Study on solid content of coatings
The solid content of chlorinated rubber coating is low and the thickness of the film is thin, so that to meet the requirements of the thickness of the film, it is necessary to increase the number of brushing times and affect the production efficiency. In order to solve this problem, it is necessary to start from the root and improve the solid content of paint. Since chlorinated rubber coatings are difficult to waterify, the solid content can only be reduced in order to ensure construction performance. At present, the solid content of chlorinated rubber coatings is between 35% and 49%, and the solvent content is high, which affects the environmental performance of coatings.

The main methods to improve the solid content of chlorinated rubber coatings are to adjust the chlorine gas inlet time and control the reaction temperature when producing chlorinated rubber resin.

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