The difference between zinc-rich epoxy and inorganic zinc-rich paint

With the use of zinc-rich primers, there are more and more zinc-rich primers on the market, such as the common epoxy-rich primer and inorganic zinc-rich primer what difference there is always a lot of doubt. What kind of paint is used?
1, the difference between zinc-rich primer and inorganic zinc-rich primer:
1, zinc-rich primer paint film toughness is better, easier to construct, and inorganic zinc-rich primer is easier to crack than it is.
2, inorganic zinc-rich primer on the base of the treatment requirements are relatively high, need to be fully flat, polished, but can be used directly, do not need to paint, and epoxy-rich zinc primer although there is no requirement for the base layer, but need to use epoxy intermediate paint on the base layer after treatment, and then brush
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3, inorganic zinc-rich paint in heat and solvent resistance, chemical resistance and conductive static electricity is better than zinc-rich epoxy paint, but the paint film flexibility and construction performance is poor. Inorganic zinc-rich paint in the construction of some special requirements, such as its curing to rely on higher relative humidity, surface porous requirements for fog spray technology, and epoxy zinc-rich paint construction requirements are much simpler than. The epoxy zinc-rich primer needs to be mixed with weather-resistant materials.
, epoxy-rich primer and inorganic zinc-rich primer application:
epoxy zinc-rich primer is widely used in a variety of steel coatings in atmospheric environments. For example: bridges, containers, towers, hulls, construction steel structures, etc.
structure corrosion-resistant system of a multi-coated system, the performance of zinc-rich epoxy and inorganic zinc-rich is basically the same, and the zinc-rich primer of epoxy can be used instead of the inorganic zinc-rich primer. From the construction point of view and construction speed point of view, epoxy zinc-rich primer is more suitable.
Recently, many large-scale steel construction projects in China have begun to use a large number of epoxy-rich zinc primers, such as the 2008 Olympic Games main venue (Dalian Zhenbang Paint), Beijing Airport Expansion (International and Haihong Paint), Shanghai Pudong International Airport Expansion (Shanghai Kailin Paint), Chongqing Tianmen Yangtze River Bridge (Jotun Paint) and so on. The main venue of the 2000 Sydney Olympic Games (international paint), the 2004 Athens Olympic Games (international paint) and so on, all use epoxy zinc-rich primers.
, inorganic zinc-rich primer applications are:
1, must use water-based coating of heavy anti-corrosion coating field. For example, cities that restrict the use of paint in the open.
2, the operating conditions exceed the long-term more than 100 degrees C, such as steam pipe outside the wall corrosion protection.
3, inorganical zinc-rich primer is also used in oil tanks or other chemical tank walls for corrosion paint.
4, high-strength bolted connection surface, inorganical zinc-rich primer anti-slip coefficient is high. Recommended options.
For the performance of the paint film, inorganic zinc-rich hardness is high, brittle, so it is not suitable for thin-walled steel structure, but very suitable for large steel structure, because the deformation of large steel structure is not large and inorganic zinc-rich hardness is high, after curing is not easy to break;
Inorganic zinc-rich is very difficult to fake, so, as long as strictly do, inorganic zinc-rich coating if done, the performance of the coating will be very good, and epoxy-rich zinc-rich primer false is too easy, and in a short period of time simply can not see the problem, resulting in the market low-zinc epoxy zinc-rich primer flooding.
inorganical zinc-rich primer quality seriously affected its various performance, so we must identify the formal brand and manufacturers, choose in line with the national standard of primer to buy.
3, zinc-rich epoxy and inorganic zinc-rich primer in the construction of advantages and disadvantages:
1, comparative projects: epoxy zinc-rich primer inorganic zinc-rich primer
2, curing environment: epoxy zinc-rich primer lower relative humidity Environment, no effect on curing reaction, inorganic zinc-rich primer low humidity will not cure, even if it has dried up, need to spray water to accelerate its curing reaction
3, stirring requirements: epoxy zinc-rich primer construction is simple, no need for continuous stirring; Machine zinc-rich primer If you stop stirring, zinc powder will precipitate
4, re-painting performance: epoxy zinc-rich primer coating is easy to coat, no need to close the paint; Special spraying techniques
5, re-painting interval: epoxy zinc-rich primer 23 degrees C 1.5 hours; inorganic zinc-rich primer time is very long, need to be cured test (MEK) to determine whether the construction of intermediate paint.
6, repair performance: epoxy zinc-rich primer damage area easy to repair, the United States SSPC steel structure coating association designated for inorganic zinc-rich primer repair
7, paint film flexibility: epoxy zinc-rich primer film than inorganic zinc-rich primer, small brittleness, good flexibility
Epoxy-rich zinc primer more than 125 micron paint film has the risk of cracking, inorganic zinc-rich primer more than 150 microns, paint film has the risk of cracking
At room temperature is very long, the curing test is required to coat the rear paint, and special fog spray technology is required, while the epoxy zinc-rich primer can be repainted in as little as 1.5 hours, conventional construction, high efficiency, can greatly shorten the tight construction period.