The current situation and progress of epoxy resin coatings in the field of marine anti-corrosion

Marine anti-corrosion coating refers to a kind of functional coating which can play a protective role against corrosion in marine engineering substation in the marine environment, and is one of the most important research objects in marine engineering coatings for a long time. Marine engineering equipment from put into use to end-of-life recovery, must continue to be subject to the marine environment corrosion, so anti-corrosion work is the key to marine engineering.
Marine Anti-corrosion Profile
Epoxy resin anti-corrosion coating is a widely used type of anti-corrosion coatings, in the marine anti-corrosion coatings have an important position
China
. For a long time, epoxy anti-corrosion coatings have become the darlings of marine anti-corrosion coatings because of their corrosion resistance, chemical resistance, acidity and alkalinity, as well as high strength, high hardness and wear resistance.
the 21st century, the competition in the marine industry has become more and more fierce, because the marine resources are very large, so the world attaches great importance to the development of marine industry. The particularity of the marine environment makes the development of marine industry much more difficult than that of ordinary industry. With the rapid development of marine engineering and ship technology, the development of marine industry is still in its preliminary stage, and all countries in the world want to take the lead in the development of marine industry.
, the problem of anti-corrosion has been an inevitable problem in the offshore operation of machinery and equipment, so marine anti-corrosion has always been an important part of marine industrial development. Among the many anti-corrosion technologies, coating protection has become the most commonly used marine anti-corrosion technology because of its economy and practicality. The development of marine anti-corrosion coatings is more valuable in modern industry. Today's marine industry to marine engineering and ship technology as the main body, ships, bridges, offshore platforms, docks and other equipment are mostly steel structure, and steel structure in the marine environment by the corrosion effect is very serious. Marine anti-corrosion work is not only related to the normal operation of marine engineering, but also related to the safety of marine industry, superior performance of anti-corrosion coatings can greatly improve the safety of marine operations.
A marine anti-corrosion coating
marine anti-corrosion coating according to the nature of the substing can be divided into two categories, one is steel structure anti-corrosion coating, the other is non-steel structure anti-corrosion coating. The former is mainly for ships, bridges, submarine steel pipes and other steel materials-based equipment and basic projects, the latter is the role of bridges, docks and other materials such as concrete, rubber-based equipment and basic projects. Because the marine environment has the characteristics of strong corrosion, long corrosion time and many unexpected factors, it is required that marine anti-corrosion coatings have the characteristics of heavy corrosion, stable performance, long service life and simple coating operation. With the development of the times, people will carry out more and more activities in the field of marine, the construction of marine engineering will show a rapid development momentum. Marine anti-corrosion coatings with excellent anti-corrosion protection can effectively protect marine engineering and avoid the phenomenon of steel structure leakage and breakage, which will greatly improve the safety of the marine working environment.
development status
marine anti-corrosion coatings as the main technology of marine engineering protection, in all countries of the world are the focus of research, and has many important research results. Countries committed to the development of marine industry have listed the study of marine anti-corrosion coatings as an important part of marine industrial development, it can be said that the level of marine anti-corrosion coatings is an important standard to measure the level of marine industrial development of a country. The research of marine anti-corrosion coating has the characteristics of high technical difficulty, long research and development cycle and large investment in research and development, and needs a lot of capital and technical personnel as the basis of research and development work.
china's marine anti-corrosion coating research in recent years has made great progress, but in the paint corrosion performance, cost control, production process, coating process and so on, there is still a large gap with foreign countries.
marine anti-corrosion coatings are mainly epoxy anti-corrosion coatings, polyurethane anti-corrosion coatings, rubber anti-corrosion coatings, organic (inorganic) silicone resin coatings and organic (inorganic) zinc-rich coatings. At present, the research direction of marine anti-corrosion coating is mainly to improve the service life of the coating, low surface treatment to reduce the cost of coating, high solid content and low solvent volume to reduce the pollution caused by solvent volatility. The research of marine anti-corrosion coatings is now in a period of rapid development, with the increase of national investment in marine industry, the development of marine anti-corrosion coatings will be possible to make a breakthrough. The research of the former has laid a good foundation for the development of marine anti-corrosion coatings, and the research of marine anti-corrosion coatings will enter a period of rapid development in the future.
epoxy anti-corrosion coatings
epoxy anti-corrosion coatings are an important part of the field of anti-corrosion coatings, is currently one of the most commonly used anti-corrosion coatings. Epoxy resin coatings have the characteristics of large hardness and high adhesion after curing, which are not easily damaged, and their excellent acid, alkali and chemical resistance characteristics are also extremely important in anti-corrosion coatings. The development of epoxy anti-corrosion coatings will remain one of the focal points in the field of anti-corrosion coatings for some time to come.
In this era of reform and innovation, the combination of epoxy antiseptic coatings and different fillers and additives can create numerous possibilities, which makes epoxy anti-corrosion coatings in the new era of development in a leading position. And now people pay more and more attention to environmental protection, water-based epoxy resin anti-corrosion coating low volatile characteristics have become a breakthrough in the development of environmentally friendly anti-corrosion coating. Therefore, epoxy resin anti-corrosion coatings in today's marine anti-corrosion coatings in the field is of great research value.
Epoxy anticorrosion coating refers to a class of polymers containing two or more epoxy groups in a molecule, which, when used in combination with curing agents, can form a coating with high hardness, high adhesion, high chemical stability and high corrosion resistance. At present, there are many kinds of epoxy anti-corrosion coatings, only from the substation resin classification there are bisphenol A epoxy resin coatings and phenolic epoxy resin coatings and so on.
, epoxy anticorrosive coatings have become more diverse. The modified methods of epoxy anti-corrosion coatings are polymer modified, silicone modified and nanomaterials modified, etc., and the modified properties make epoxy anti-corrosion coatings get better performance.
progress in the research of epoxy anti-corrosion coatings
epoxy resin has been continuously developed since its successful synthesis in 1930. Researchers have done a lot of research from epoxy coating itself, to the structure of epoxy anticorrosion coating, to epoxy resin anticorrosion coating.
Wankai, Li Changcheng, etc. synthesized acrylic resin with epoxy group, and mixed with epoxy resin to prepare a modified epoxy resin anti-corrosion coating. After testing the viscosity, adhesion and corrosion resistance of the coating, it was found that the modified epoxy anti-corrosion coating has stronger adhesion and electrochemical properties than the unalvested epoxy anti-corrosion coating.
, Zhang Wei, etc. used zinc phosphate and mica iron oxide ash as fillers in the study of solvent-free epoxy anticorrosive coatings. The effects of coating volume concentration (PVC) and pigment-thinner quality ratio on coating corrosion resistance were analyzed, and zinc phosphate was shown to inhibit corrosion in anticorrosive coatings.
Viorel Panaite, Simona Boiciuc and other studies using mixed nanoparticle modified epoxy coating containing ZnO nanoparticles on naval steel corrosion performance, found that epoxy resin anti-corrosion coating in polarizing resistance and corrosion suppression rate, in the Black Sea sea after 120 days of real marine environment testing, modified epoxy anti-corrosion coating showed significantly improved corrosion behavior.
Prashant Gupta, Madhu Bajpai experimented with phenolic varnish epoxy resins in the study of epoxy anticorrosive coatings. Phenol epoxy resin has the disadvantages of poor impact strength, high rigidity and moisture absorption, so it is generally not used as the basis material of anti-corrosion coating, but its excellent chemical resistance, low shrinkage and good adhesion are very worthy of research performance. Siliconized epoxy resins are prepared by reacting silicone resins containing amine-based groups with phenolic epoxy resins, and interphenyls are used as curing agents. The resulting coating performs well in heat and chemical resistance and has important commercial value.
L.K. Aggarwal, P.C.Thapliyal, S.R. Karade prepare epoxy-slethyl alcohol resins using chlorool, bisphenol a epoxy resin and cashew phenol, and epoxy anticorrosive coatings based on this resin. Zinc powder, zinc phosphate, mica iron oxide and synthetic iron oxide are used as pigments and fillers in the preparation of coatings, and aromatic polyamine compounds are used as curing agents. It also studies the extrusion strength, elongation rate, binding with steel and water vapor permeability of the coating film. In comparison with unmodyensed anti-corrosion coatings, it is found that the anti-corrosion properties of modified epoxy anti-corrosion coatings are better, and mica iron oxide in coatings shows the best corrosion resistance, followed by zinc phosphate.
China's research on epoxy resin began in 1956, is the new China after the establishment of more attention to one of the industrial content, for a long time, epoxy resin anti-corrosion coatings are an important part of my research in the field of defense corrosion coatings. Nowadays, china, as a maritime power, in the environment of vigorously developing offshore industry, must have anti-corrosion coating research as a support, epoxy resin anti-corrosion coating in modern society still has good market prospects and application value.
progress of anti-corrosion and high thermal conductive coatings
In the marine industry, which is dominated by mechanical equipment, another problem that can not be ignored is the thermal conductivity of equipment. Marine industry to large-scale equipment-based, large-scale equipment often need a lot of power to drive, in the process of operation will produce a large amount of heat, the timely release of heat is a major problem.
this requires large equipment to be able to dissipate heat efficiently after applying an anti-corrosion coating, requiring a high thermal conductivity of the anti-corrosion coating. High thermal anti-corrosion coatings for the marine industry safety improvement is of great significance, if the equipment in time to release excess heat, not only affect the normal operation of the equipment, but also cause equipment damage or disaster, high thermal conductivity anti-corrosion coatings can make the equipment excess heat timely transmission to the environment, will greatly improve the safety and stability of equipment work. Therefore, in the field of anti-corrosion coatings, anti-corrosion coatings thermal conductivity, conductivity, heat resistance, wear resistance, etc. have become the content of research.
Sabyasachi Ganguli and other research graphite modified epoxy composite materials, the composite material conducted conductivity and thermal conductivity tests found that with the modified epoxy resin coating graphite content increased from 2% to 20%, modified thermal conductivity decreased, but the thermal conductivity has been significantly improved. After adding 20% graphite content, the composite material is 28 times more thermally conductive than when graphite is not added, and the thermal conductivity is increased from 0.2W/mK to 5.8W/mK.
Kiho Kim, Seokgyu Ryu, Jooheon Kim made an excellent thermally conductive corrosion-resistant coating from 1. 82W/mK increased to 3.9W/mK.
anti-corrosion thermal coating is a rapidly developing functional coating, which is mainly used in heat exchangers, petrochemicals and marine engineering. The environment for the use of anti-corrosion and high thermal conductive coatings is the marine environment, which has the characteristics of high salt content and high humidity, the corrosion of sea water, sea breeze and ocean atmosphere is particularly serious, and the attachment damage of marine life is a great challenge to the anti-corrosion work of marine engineering. In the context of the rapid development of marine industry, anti-corrosion coatings that can adapt to specific environments have greater application value. At present, there are a large number of marine engineering equipment in the course of operation will produce a large amount of heat, although the traditional anti-corrosion coatings can play an anti-corrosion role on the equipment, but it is not conducive to the release and transfer of heat, so with high thermal conductivity of anti-corrosion coatings have great research value.
Development Outlook
The study of thermal conductivity of anti-corrosion coatings is still in the development stage, and the formulation design of high thermal conductive coatings is relatively small, and most of them are concentrated in the field of heat exchangers and petrochemicals. The application of anti-corrosion high thermal coating is not wide enough, and its application in marine anti-corrosion coating is still in the groping stage. Therefore, the research of anti-corrosion high thermal conductive coatings still has a long way to go, the design of marine anti-corrosion coatings in the future, one of the important development directions, its back has a huge market value to be developed.