The hottest epoxy coal tar pitch coating has been

Epoxy coal tar pitch paint has been hard for more than 20 years

epoxy coal tar pitch paint has been hard for more than 20 years

June 11, 2004

epoxy coal tar pitch paint, which has been used on a large scale for the first time in China since 1982, is still black, bright and hard after more than 20 years. At present, a new generation of product, epoxy coal tar pitch anticorrosive material, has been developed and has repeatedly been in-depth on-site for guidance - epoxy coal tar pitch cold wrapping tape, which has also improved the anticorrosive level of our country

the first generation of epoxy coal tar pitch coating was successfully developed in 1974, and the second generation was successfully developed in 1979. In 1987, the Ministry of petroleum prepared the technical standard for epoxy coal tar pitch anticorrosive coating of buried steel pipelines (SYJ) and the code for design of corrosion engineering of steel pipelines and storage tanks (SYJ). In 1991, the Ministry of petroleum formulated the code for construction and acceptance of epoxy coal tar pitch anticorrosive coating of buried steel pipelines (SYJ). In 1996, the Ministry of petroleum revised the above three standards again and issued the Chinese oil and gas industry standard sy/t

it has been 28 years since the first batch of samples of epoxy coal tar pitch coating were buried in Daqing, Qinhuangdao, Zhengzhou, Wuhan and Zhanjiang; The second generation product GH2 was used in the first station of Qinhuangdao oil transportation company for 11 kilometers in 1982 Φ 720mm to implement the development strategy of high-efficiency and green plastic granulator, pipeline corrosion prevention, as the first and largest industrial use, has achieved good results after 22 years. Later, epoxy coal tar pitch coating has been used in the underground water pipeline in front of the Military Museum of Beijing water supply company, which has a history of nearly 20 years; It has been used for 450 kilometers of gas pipes in the urban area of Harbin for more than 10 years; More than 40 kilometers of water supply pipelines used in the first and second phase projects of Beijing water source No. 9 plant have a history of more than 10 years, setting a precedent for the external corrosion prevention of large-diameter water supply pipelines in China. Epoxy coal tar pitch coating is also very successful in the anti-corrosion of oil storage tanks and other petrochemical equipment. More than 10 years ago, the top of 11 5000m3 oil tanks in Binnan initial station of Shengli Oilfield were all replaced with epoxy coal tar pitch for corrosion prevention overhaul, which is still intact; In 1989, the Asian Games Village sewage treatment plant has used epoxy coal tar pitch for anti-corrosion of activated sludge tanks (concrete tanks) for 15 years; Epoxy coal tar pitch is also used in the activated sludge tank and sewage pipeline of Beijing Gaobeidian sewage treatment plant, and the effect is very good. In 1986, the first phase project of Shijingshan Power Plant selected epoxy coal tar pitch, and its performance has remained unchanged for more than 10 years

at present, epoxy coal tar pitch has been used in various pipelines such as tap water, gas, natural gas and heat supply in petroleum, chemical industry, non-ferrous metals, electric power, coal, metallurgy, civil aviation, urban utilities and other industries. It is the most widely used anti-corrosion material in China. Recently, it has been used on a large scale in the Beijing Olympic Games project, the west east gas transmission project and Shanghai urban construction. According to experts from China epoxy resin industry association, epoxy coal tar pitch has the following advantages: first, the anti-corrosion coating has stable performance and long service life; Second, the construction is convenient, the coating is naturally solidified, and there is no need for heating equipment, which can be mechanized, semi mechanized or manual construction; Third, the coating cost is relatively low. Under the same rust removal conditions, the comprehensive cost (including transportation, processing, loss, etc.) is lower than all anti-corrosion materials, which is comparable to petroleum asphalt; Fourth, after more than 20 years of experience accumulation, we have formulated a set of technical standards from design to construction, which shows that its technology is mature and reliable. Of course, this product also has some disadvantages, such as slow curing at low temperature (below 10 ℃), and large influence of human factors on the proportion or mixing

for this reason, Langfang Donghua anti corrosion Engineering Co., Ltd. recently invented a new type of epoxy coal tar pitch anti-corrosion material - epoxy coal tar pitch cold wrapping tape. It is composed of cold winding tape and setting glue. It is made of polypropylene non-woven felt impregnated with epoxy asphalt finish after slitting and winding. The standard slitting width is 250 mm, and the machine speed is directly related to the driver speed. The length of each roll is 30 m. It can also be adjusted according to the special requirements of users. It is divided into ordinary type and thickened type according to the thickness. The setting glue is composed of sub packaged components a and B. according to the use temperature, it is divided into general-purpose type (used above 5 ℃) and low-temperature type (only used below 5 ℃). When leaving the factory, the cold wrapping tape and the setting glue are supplied together. During construction, the components a and B of the setting glue are mixed in equal quantities, and then the available resources are wasted according to the setting glue - cold wrapping tape - setting; The structure with large investment in combustion treatment is coated on the surface of the protected object, and the epoxy coal asphalt anticorrosive coating is formed after standing and natural curing. Polypropylene non-woven felt is selected as the base material of epoxy coal tar pitch cold winding belt. It is a synthetic fiber with high mechanical strength and good corrosion resistance, and the surface does not contain wax, and the thickness is uniform. Therefore, the anti-corrosion layer has flat surface, strong adhesion, few pinholes, and excellent electrical and anti-corrosion properties. At the same time, the setting glue adopts a special formula, the curing speed of the anti-corrosion coating is fast, the construction period is short, and the normal construction can be carried out all year round, which solves the construction problems in winter. It is convenient and fast to use this product for construction. One coat can meet the reinforced or extra reinforced anti-corrosion coating required by the Chinese petroleum and natural gas industry standard sy/t, which is more labor-saving and convenient than using epoxy coal tar paint and glass cloth