China's heavy anti-corrosion paint development trend? These are the big trends you need to know!

Heavy anti-corrosion coatings
this paper describes the characteristics of the development of heavy anti-corrosion coatings in China, especially to improve the energy-saving and environmental protection performance of heavy anti-corrosion coatings is the primary task at present.
including standardized design, ensure coating service life, promote high-solid content, low VOC heavy anti-corrosion coatings, the development and application of low-surface treatment coatings, the development of water-based heavy anti-corrosion coatings and so on. In particular, the article points out that standardizing the coating of heavy anti-corrosion coatings is also one of the important responsibilities of developing heavy anti-corrosion coatings
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China's heavy anti-corrosion coating industry belongs to ships, containers, bridges, petrochemicals, electricity, railway engineering, construction steel structure seven departments. Their start with the reform and opening up basically synchronized, and the starting point is high. In the past 30 years, China's heavy anti-corrosion coating industry in the rapid economic development, has entered a high-speed growth of the golden period, the paint industry has become the fastest-growing, with the earliest international contact, the highest added value of the market sector.
In the past two years, as China's economy has entered the new normal development, especially in the "13th Five-Year Plan", the state has seized the best time for technological innovation and structural adjustment, in order to stabilize development, to avoid the adverse effects of the adjustment and growth of the heavy anti-corrosion coating industry such as industrial overcapacity, excessive consumption of resources, ecological deterioration, general ineconsistencies and other ills, from 2018 onwards, the development of heavy anti-corrosion coatings has the following characteristics.
The growth rate of heavy anti-corrosion coating production slowed down
It is clear from Table 1 that the growth rate of heavy anti-corrosion paint production in China has gradually slowed down, and in recent years, China's market economy has gradually shown weakness, especially in 2015 with the leading marine paint, the same industry is at a low ebb, in 2016 there was a reduction in production to 260,000 tons; In 2017, although there was a sharp increase in bridge and railway engineering coatings, the growth rate of heavy anti-corrosion coatings was slower (see table 1).
Table 1, China's total amount of paint and heavy anti-corrosion paint production
heavy anti-corrosion paint market competition is fierce
after the reform and development, the world's major heavy anti-corrosion coating companies into China, joint venture or wholly-owned way to build factories in China, from the container, marine industry gradually expanded to marine engineering bridges and other industries, foreign paint companies strong into the Chinese market, with its technical varieties management, service advantages, in China's urban attack slightly, has completed the domestic production and strategic layout of China's anti-corrosion paint market (see table II).
Table 2, the major domestic market brand
In China's construction of the world's largest coal chemical Fluor project, the owners designated AkzoNobel and Jotun and other companies' coatings; Increased competitiveness in the market. But domestic enterprises can also resist the pressure to develop in the competition. "Chongqing Three Gorges", "Zhejiang Fish Children", "Northwest Yongxin", "Shanxi Baotashan", "Lanling" and other large factories with a strong technical background to petrochemical, bridges, non-standard containers, military and other industries. According to incomplete statistics, the country has more than a dozen paint factory sales amount of more than 300 million, of which the number of domestic enterprises accounted for one-third, competition has also promoted the development of heavy anti-corrosion paint industry.
the supporting and advanced nature of heavy anti-corrosion coatings has been improved
from a technical point of view: for more severe corrosion environment, corrosion-resistant life is relatively long, thick-filmed coatings are called heavy anti-corrosion coatings. The application of heavy anti-corrosion coatings is extensive and involves all the key areas of modern industry. With the new norms and standards at home and abroad, the advanced and supporting features of heavy anti-corrosion coatings and coatings in China continue to improve.
to China's bridge coating as an example to illustrate. Such as the world's longest cross-sea bridge steel box beam implementation of the full coating package (see table 3): table
, Hong Kong-Zhuhai-Macao Bridge steel box beam coating package
At present, there is also an arc zinc spray (aluminum) instead of primer, and then with heavy anti-corrosion coatings, compared to iso14713 international standards, composite coating has a service life of more than 20 years. (see Table 4) This package requires a surface treatment level of GB8923 Sa3, and a high environmental awareness requirement for operators. There is a tendency to gradually reduce this kind of supporting scheme with high energy consumption and high cost.
Table 4, winged gate bridge steel box beam outside supporting scheme
In the bridge coating package, polyurethane, fluorocarbon, polysilica paint is the most commonly used three kinds of high-performance paint. After continuous research and development and engineering applications in recent years, the appearance quality, construction performance and service life of these paints have been significantly improved. In particular, the number of fluorocarbon finishes increased rapidly. In addition to AkzoNobel, Jotun, PPG, Xuanwei and other large international companies can produce polysilicone paint, China's "Three Gorges", "Shengxin", "Da Nang" and other polysilicae paint has also been used in the bridge coating.
with the increasing number of new concrete bridges, novel heavy anti-corrosion coatings are gradually replacing traditional coatings. With a certain degree of advanced Hangzhou Bay Bridge concrete coating matching scheme (see Table 5) is for different parts of the corrosion characteristics of the design of different coating matching system.
Table 5, Hangzhou Bay Bridge concrete protective coating supporting program for more than
years, the practical application of multi-engineering, China's bridge protection coating variety structure and supporting composition has been basically shaped (see Table 6).
Table 6, China's bridge paint varieties composition and supporting structure
practice has proved that: heavy anti-corrosion coating matching, reasonable structure and composition, and promote the rapid development of China's bridge industry.
energy-saving and environmental protection of heavy anti-corrosion coatings has been improved
China's heavy anti-corrosion coating technology in accordance with environmental protection, energy-saving concept to achieve sound development is in line with China's environmental policy is an important direction.
Symological Design
conducts a comprehensive cost analysis and evaluation of the innovative concept of full-life analysis (LCC) applied by large design institutes in anti-corrosion engineering, and the true meaning of coating service life needs to be fully understood in the supporting design of heavy anti-corrosion coatings. It is neither the life of the structure nor the commercial guarantee period for coating quality by the coating manufacturer, but the service life of the coating.
If in accordance with ISO12944 international standards and ISO14713 arc zinc spray (aluminum) layer to increase corrosion environment, coating thickness, coating life, such as the relationship between the closure of anti-corrosion coatings, proposed greater than 15 years, 20 years and other coating life. The service life of the coating is usually defined by the steel structure ISO4628 standard, which refers to the number of years from the beginning of service to the first overhaul of the coating. The first overhaul begins when the coating rust level reaches Ri3, i.e. the equivalent of 1% of the rust area. At this time, the performance price ratio is the highest and most economical.
environmental standards
in recent years, due to environmental regulations, has been completely prohibited in the heavy anti-corrosion paint industry use of red dan coatings. Epoxy asphalt coatings have also been gradually banned in marine engineering to protect the marine environment.
anti-corrosion coating works of key projects such as the Hong Kong-Zhuhai-Macao Bridge, the heavy metal composition and content of the selected supporting coatings are limited in accordance with the RoHs2011/65 and EUCO950-2008 standards, as detailed in Table 7.
Table 7, Hong Kong-Zhuhai-Macao Bridge supporting coatings
heavy metal ion content requirements
in the marine industry, organized by the Ministry of Environmental Protection, "China for anti-fouling paint DDT alternative project" completed, screening out 14 DDT alternative anti-fouling paint varieties, the revision of the "ship anti-fouling paint DDD content testing and determination" (GB/T 25011-2010) standard, "Ship anti-fouling paint tin total test and determination" (GB/T26085-2010) standard, and developed and promulgated the "environmental marking product technical requirements of ship anti-fouling paint" (HJ 2515-2012) standard.
To promote the application of high solid weight heavy anti-corrosion coatings
high solid content of paint VOC content is low, low degree of damage to the environment and human health, and actively develop and promote the application of high solid content, low VOC content of environmentally friendly coatings is one of the important directions of harmless paint. Taking the commonly used eythoxy cloud iron mid-layer paint as an example, the increase in solid content significantly reduced the VOC content (see Table 8).
table 8, a variety of epoxy cloud iron intermediate lacquer solid content and VOC value
high solid content of heavy anti-corrosion coatings, airless spray paint up to 250 m DFT or more. Reducing the number of construction channels, curing the film at room temperature, and excellent edge covering performance are undoubtedly beneficial to the energy saving and emission reduction of the coating project.
The Hong Kong-Zhuhai-Macao Bridge also put forward restrictions on the VOC content of the matching coatings (see Table 9).
Table 9, Hong Kong-Zhuhai-Macao Bridge on the supporting coating VOC restrictions
steel box beams on the inside of the coating, based on energy-saving, environmental protection considerations, the recent high solid or solvent-free epoxy coatings are actively promoting the application. The water-based solvent-free epoxy coating was successfully applied on the inside of the bridge steel box beam manufactured by Shanghai Zhenhua Heavy Industry.
Low surface treatment coatings are widely used in maintenance overhaul projects
energy-saving, environmentally friendly low-surface treatment coatings require surface treatment as low as > ISO 8501-1 St2; According to the resin type classification, mainly epoxy, in addition to alcoholic acid, acrylic acid, two-group polyurethane and single-group wet-cured polyurethane coatings. In addition to AkzoNobel, Haihong old people, PPG, and other large international companies, the domestic "Three Gorges", "Lanling", "Fish Child", "Xinhe", "Red Lion", "Bermuda" have also successfully developed low surface treatment coatings, the Ministry of Chemical Industry also set the technical standards and construction guidance of low surface treatment coatings, I believe that in the near future, low surface treatment coatings will be widely used in bridges, oil tanks, oil field equipment repair, play its role in environmental protection, energy conservation.
According to the survey, the recent application of low-surface treatment primers typical projects are (see table 10):
table 10, low-surface treatment paint engineering cases
actively promote the application of water-based coatings
In the marine industry, for example, water-based coatings in ship cabins and crew living compartments can reduce VOC emissions and improve productivity. Water-based workshop primers are also in the application promotion class, in addition to the above two advantages, but also can optimize welding, cutting speed, speed up the production process. However, the water-based heavy anti-corrosion coating in the performance and construction there are still a certain short plate, the development rate is the slowest. According to incomplete statistics, in 2016 the proportion of applications in seven industries is less than 3.5%
from a development perspective of the container industry, in 2018 it has to become a heavy anti-corrosion industry, more than 90% of the use of water-based complementary coatings industry. In March 2016, the China Container Association, the four major box-making groups, various paint suppliers and relevant certification bodies jointly signed a self-regulatory notarization, from July 1, 2016, all water-based coatings are used in Guangdong, Guangdong region in April 2017 Since the implementation of the "no solvent push water-based coatings
affected by water-based coatings, COSCO Kanswi, Zhongdao, Haihong company in the container industry's leading position was significantly excluded;
In the process of promoting container water-based coatings, each coating factory should actively study to improve product quality, reduce costs, in the coating process, adapt to three minutes a TEu production rhythm;
construction steel structure industry, but also more applications of water-based coatings, the industry is also an early application of water-based inorganic zinc-rich primer. From 1995 Pudong International Airport, Hangzhou International Airport to the 2008 Shanghai Pudong World Expo China Pavilion and other five venues have adopted water-based inorganic zinc-rich primer and solvent-based epoxy cloud iron mid-layer paint, polyurethane paint matching, and achieved good results.
there are currently more than 50 factories in the country will produce water-inorganic zinc-rich primers, the largest is Shanghai Menpuy New Materials Company, 2010 annual sales reached about 100 million. In addition, Jiangsu Newland, Langfang Zhongke, Shijiazhuang goldfish, Chongqing Three Gorges, Jiangsu Lanling and other key factories of water-inorganic inorganic zinc-rich primers have also been put into key projects. Jiangsu Huning steel machine, Shijiazhuang Jinhuan, Zhejiang Hang Xiao and other key steel structures are water-inorganic zinc-rich primer as a "universal primer" a large number of applications. It and solvent-based epoxy cloud iron mid-layer paint and other supporting performance is excellent, in accordance with the relevant provisions of ISO 12944-2, in C3, C4 corrosion environment conditions, there is more than 15 years of corrosion protection life. In 2011, water-inorganic inorganic zinc-rich primers accounted for more than one-third of the total number of primers in the construction steel industry.
Just as water-based paint factories, including "Menpula" and other water-based epoxy mid-layer paint, water-based polyurethane paint development, a number of domestic water-based paint products gradually replaced the water-based inorganic zinc-rich primer, with a single part, easy to operate, a full set of water-based low-cost competition and other ways, water-based inorganic zinc-rich primer squeezed out of the construction steel structure market. At present, water-based inorganic zinc-rich primer use to reduce the amount of paint in the end less than a quarter. Water-based coatings used in small and medium-sized construction steel construction projects are single components, fast-drying acrylic primers, finishes, low prices to 10 yuan / kg. Frequent fire-resistant coatings do not match the condition, and even the coating falls off. In particular, it is worth mentioning that the vast majority of construction steel mills do not have a full-time blasting room, paint room, heating and drying is difficult, winter can not be used. Construction steel structure industry to implement all water-based coatings,