The development trend of heavy-duty anticorrosive coatings industry in China

In the paint industry, the output of anticorrosive coatings is the second largest variety of coatings after architectural coatings, generally divided into conventional anticorrosive coatings and heavy anticorrosive coatings.

Conventional anticorrosive coatings refer to coatings that have anticorrosive effect on metal and other substrates and prolong their service life under general environmental conditions; Heavy-duty anticorrosive coatings refer to coatings that can be applied in relatively harsh corrosive environments and have a longer protection period than conventional anticorrosive coatings. Class I anticorrosive coatings. Heavy duty anticorrosive coatings are the most powerful, representative and influential protective coatings with the greatest development potential. They are also one of the important indicators to measure the development level of a country's coatings industry.

Heavy-duty anticorrosive coatings have two distinct characteristics: one is that they can be used under harsh conditions and have long-term anticorrosive life; the other is that they are thick-film coated. The dry film thickness of general anticorrosive coatings is about 100 or 150 microns, while that of heavy-duty anticorrosive coatings is over 200 or 300 microns, and there are 500-1,000 microns, or even more.

Heavy-duty anticorrosive coatings are mainly used in ships, containers, petrochemical industry, building steel structures, railways, bridges, electric power and water conservancy projects and many other important areas related to the national development strategy and economic lifeline. Heavy-duty anticorrosive coatings play a very important role in escorting economic development.

The trend of development of heavy-duty anticorrosive coatings is

1. Waterborne

With the increasing urgency and strictness of environmental protection requirements of the public, the development of low energy consumption, low pollution and High Performance Waterborne heavy-duty anticorrosive coatings has become one of the current research hotspots. The key to the development of waterborne heavy-duty anticorrosive coatings is the development of water-soluble film-forming resins. At present, waterborne epoxy, fluorocarbon and waterborne polyurethane anticorrosive coatings have been successfully developed. However, water-borne heavy-duty anticorrosive coatings are still vulnerable to flash corrosion, water resistance and mechanical properties of the film are relatively poor, and need to be further improved. As an important part of heavy-duty anticorrosive coatings, anti-rust pigments play an important role in slowing down metal corrosion. Common anti-rust pigments containing heavy metals, although they have excellent properties, can cause great pollution to the environment, so they are gradually limited in practical use. In recent years, the use of environmentally friendly anti-rust pigments instead of traditional anti-rust pigments has become the current development direction of environmentally friendly heavy-duty anti-rust coatings. However, in order to completely replace the traditional toxic anti-rust pigments, it is necessary to intensify research and development on the theory and application of non-toxic anti-rust pigments.

2. Multi-functional

Single-function heavy-duty anticorrosive coatings are far from meeting the enormous needs of modern paint industry, and it is imperative to diversify the functions of heavy-duty anticorrosive coatings. For example, composite ceramic high temperature resistant anticorrosive coating, conductive polyaniline heavy-duty anticorrosive coating, self-healing heavy-duty anticorrosive coating, nano-composite powder zinc-infiltration aggravating anticorrosive coating. In order to promote the development and product upgrading of heavy-duty anticorrosive coatings and seize the commanding heights of the development of the world's heavy-duty anticorrosive coatings, we must attach great importance to the multifunction of heavy-duty anticorrosive coatings.

3. Integration of coating and painting

Three-component coating, seven-component construction. Paint itself can be said to be a semi-finished product. Only when it is combined with painting can it be turned into finished product. It can be seen that the importance of painting quality directly determines the final engineering quality. Up to now, the integrated system management of coatings is still the top priority of the coatings industry in China. In the development of coatings products, we must take into account the study of coating technology. Only after the integration of coating and painting can we achieve the "reliability" of the final product. At the same time, the new coating technology will also promote the upgrading of coatings products. In recent years, the cost of surface treatment and labor of base materials before painting has increased gradually, which has promoted the development of low-treatment surface primer products. The development of wet-rust primer has been promoted by wet sand blasting and high-pressure water rust removal processes. Of course, the new coating process also puts forward higher requirements for the construction performance of paint products, which also promotes the performance improvement of heavy-duty anticorrosive coatings. To sum up the above analysis, it is necessary to strengthen the painting standards of the industry, enhance the technical service ability, and establish a high-quality technical service team.

The development direction of anticorrosive coatings is energy saving, environmental protection, high performance and functionalization. This also requires the paint industry to develop towards water-based, solvent-free or high solidification, powder, high performance and multi-function, low surface treatment, heavy metallization and other low pollution, pollution-free direction. Various waterborne coatings, high solid/solvent-free coatings, low surface treatment primers, nano-modified coatings, conductive polyaniline coatings, one-component moisture curable polyurethane coatings, ultra-high pressure water jet cleaning technology, peel-off protective coatings and new anti-fouling coatings for marine environment have been continuously concerned. Annotation and development. The development of environmentally friendly industrial heavy-duty anticorrosive coatings is a high-tech project being actively explored by many developed countries, and it is also a new field in China. In the field of heavy-duty anticorrosion, some environmentally friendly and efficient products have been widely used due to the early integration with foreign technology and the drive of various laws and policies.