Chlorinated rubber coatings have excellent water resistance, acid resistance, alkali resistance, rust prevention performance, fast drying, convenient construction, and can be dried at -30 ℃. They are widely used in the fields of ship and chemical engineering, power generation, oil refining, steel, water conservancy engineering, and other steel structure coating heavy anti-corrosion coatings. Although chlorinated rubber itself is non-toxic, odorless, and environmentally friendly, the carbon tetrachloride used in the production process can damage the ozone layer that protects the Earth's atmosphere. Therefore, starting from 2005, the State Environmental Protection Administration decided to stop and restrict the use of carbon tetrachloride in the production of chlorinated rubber in accordance with the Montreal Convention, and completely stopped using carbon tetrachloride by 2010. Although research institutions and enterprises in China have been exploring and developing the aqueous phase method for producing chlorinated rubber since the 1980s, in order to replace the production process of producing chlorinated rubber from carbon tetrachloride, it seems that the research and development of this technology has become more urgent. ?

Chlorinated rubber has been used in the paint industry for 70 years. The British Steel Research Association conducted research and application on the protection of underwater steel structures with chlorinated rubber coatings as early as the early 1950s. However, due to limitations in the manufacturing technology of chlorinated rubber and coatings, the paint film was too thin and impractical, and had to give up. In 1960, ICI Company in the UK produced chlorinated rubber containing 67% chlorine, which greatly improved the performance of chlorinated rubber. The following year, ICI company successfully developed chlorinated rubber thick film coatings, and with the emergence of airless high-pressure spraying technology, chlorinated rubber coatings made rapid progress. ?

Since the 1960s, China's chlorinated rubber and chlorinated rubber coatings have been developed successfully by Shanghai Electrochemical Factory (now Shanghai Chloroalkali Chemical Group Company). The chlorinated rubber production technology has been developed successfully by Shanghai Kailin Paint Factory, and the chlorinated rubber series coatings have achieved rapid development since their promotion and application in the 1970s, and have been widely welcomed by the anti-corrosion industry. The enterprises in China that use carbon tetrachloride method to produce chlorinated rubber have rapidly expanded from Shanghai to Jiangsu, Zhejiang, Guangdong, Shandong, Fujian, Anhui, and other places. The number of production enterprises has rapidly increased to nearly 10, with an annual production capacity of about 5000 tons, meeting the needs of the domestic market. ?

Yulong Chemical New Materials Co., Ltd. in Fenghua City, Zhejiang Province has been developing the technology of producing chlorinated rubber through aqueous phase method since the late 1990s. According to the company, the water phase chlorinated rubber production process developed by screening and using auxiliary systems in the reaction process has solved the technical problem of stability. In the second half of 2004, Shanghai Kailin Paint Factory conducted a full performance test on aqueous chlorinated rubber to verify whether it met the performance indicators of carbon tetrachloride chlorinated rubber. The aqueous chlorinated rubber production process removes carbon tetrachloride from traditional processes, meeting the requirements of the Montreal Convention for prohibiting and restricting the use of carbon tetrachloride. ?

The experimental results show that the quality indicators of chlorinated rubber produced by aqueous phase method have reached the quality indicators of domestic chlorinated rubber and foreign chlorinated rubber produced by carbon tetrachloride solvent method. The thermal stability of aqueous chlorinated rubber does not change color after more than 30 minutes on Congo red test paper, which is superior to domestic solvent chlorinated rubber and the same as imported carbon tetrachloride solvent chlorinated rubber. The coating made of chlorinated rubber using aqueous phase method has conventional properties such as appearance, viscosity, fineness, dryness, adhesion, flexibility, and impact resistance, which meet the technical requirements of ship paint products from Shanghai Kailin Paint Factory and have the same properties as chlorinated rubber made by domestic and imported carbon tetrachloride solvent method. The anti rust paint and topcoat made of chlorinated rubber using aqueous phase method meet the technical requirements for ship paint in terms of salt water resistance, fresh water resistance, salt spray resistance, and other test and construction indicators, and have the same performance as domestic and imported carbon tetrachloride solvent chlorinated rubber. The results of the storage stability test indicate that the viscosity changes of the CR-2 chlorinated rubber aluminum powder anti rust paint and topcoat prepared by the aqueous phase method are within the normal range, and the storage stability after coating is the same as that of the solvent chlorinated rubber.