With the advancement of heavy-duty anti-corrosion coating technology and the application of modern spraying equipment, especially high-pressure airless spraying equipment, solvent-free double-port spraying equipment, powder spraying equipment, etc., heavy anti-corrosion coatings are extended to special anti-corrosion coatings. This paper, published by the Technical Support Division of Xianghua Coating Phosphate (Chengdu), provides a comprehensive description of the major application industries for heavy-duty coatings.

1 main application areas

Heavy-duty anti-corrosion coatings are mainly used in harsh environments with outstanding corrosion problems and industrial sectors that are not convenient for short-term maintenance. The application areas are as follows:

1 Emerging marine engineering: offshore facilities, coastal and bay structures, offshore oil rigs;

2 Modern transportation: highway guardrails, bridges, boats, containers, trains and railway facilities, automobiles, airport facilities;

3 Energy industry: hydraulic equipment, water tanks, gas tanks, petroleum refining equipment, petroleum storage equipment (oil pipes, oil tanks), power transmission and transformation equipment, nuclear power, coal mines;

4 Large-scale industrial enterprises: papermaking equipment, medical equipment, food and chemical equipment, metal containers inside and outside walls, pipes of chemical, steel and petrochemical plants, storage tanks, mining smelting, cement plant equipment, ground with corrosive media, walls, cement components.

5 Municipal facilities: gas pipelines and their facilities (such as gas cabinets), natural gas pipelines, drinking water facilities, garbage disposal equipment, etc.

1 The development of modern industry:

Created material conditions and a broad market for heavy-duty coatings, from land (such as heavy-duty anti-corrosion coatings to highways, urban rail transit, nuclear power plants, radio and television towers, etc.) to the ocean, from underground to space, from traditional industries to emerging Industry has provided a broad stage for heavy-duty coatings. For example, desalination and seawater utilization projects have opened up a new field and market for heavy-duty coatings and applications. In the oil-rich Middle East, the sea is backed by the desert, which is a typical water-deficient area. To solve the water source, it mainly relies on seawater desalination technology. Industrial water for mining and petroleum also has to resort to water treatment projects for seawater use. According to statistics, in 1975, the world's daily production of fresh water was 2 million m3, and in 1994 it reached 20 million m3, which has increased 10 times in 20 years. Seawater desalination and seawater utilization facilities in the United States, Japan, and Israel must face the erosion of seawater. Due to the peculiarities of seawater corrosion, more stringent requirements are imposed on heavy-duty coatings used in these facilities. As a result, water-based heavy-duty anti-corrosion coatings for seawater desalination and seawater utilization have emerged and will develop accordingly. Due to the increasing application of heavy-duty anti-corrosion coatings, heavy-duty anti-corrosion coatings have developed rapidly. In industrial coatings, heavy-duty anti-corrosion coatings account for 5% to 7% of total coatings.

2 Promotion of environmental protection:

With the development of modern industry, the concentration of carbon dioxide and hydrocarbons in the atmosphere is increasing, which not only causes global temperature rise, but also causes one-time pollution to the environment, and some organic matter reacts with nitrogen oxides in the air. Produces toxic ozone, etc., causing secondary pollution that is greater than one-time pollution. According to statistics, the world releases about 20 million tons of hydrocarbons per year to the atmosphere, most of which is painted by paint. The amount of organic solvent discharged into the atmosphere by the paint manufacturing is 2% of the amount of the coating, and the organic solvent volatilized into the atmosphere during the coating process is 50% to 80% of the amount of the coating. In order to eliminate the pollution of paint coating to the atmosphere, heavy anti-corrosion coatings are developing towards high solids (currently, high solids solvent-based heavy-duty anticorrosive coatings, most of which are epoxy type), solvent-free, and water-based. Among them, high solids and water-based are the main features of the development and application of heavy-duty coatings. (The chlorinated rubber heavy-duty anti-corrosion coating used in the Sydney Harbour Bridge has a solvent content of 500g/L, and its solvent is volatilized into the atmosphere, causing serious pollution to the environment).

Variety with superior performance will be more widely used

Excellent overall performance includes:

1 Excellent anti-corrosion performance: good adhesion, excellent anti-corrosion performance and long service life. According to this requirement, Xianghe Coatings Co., Ltd. has developed a new heavy-duty anti-corrosion coating that combines epoxy heavy-duty anti-corrosion coating and chlorosulfonated polyethylene rubber heavy-duty anti-corrosion coating, which has excellent acid, salt and seawater resistance. Anti-aging and other properties to meet the needs of the market.

2 Excellent construction performance: It can be cured like normal anti-corrosion coating at room temperature, and it is easy to construct. It can be operated by unskilled people. (The reason why chlorinated rubber heavy-duty anti-corrosion coating can get a lot of applications is mainly because of this reason). The construction of the heavy-duty anti-corrosion coating integrated with the epoxy and rubber of Xianghe brand is basically the same as that of the ordinary two-component epoxy anti-corrosion coating, and it is cured at room temperature, so that ordinary constructors can also master it.

3 Excellent environmental performance: the traditional solvent-based anti-corrosion coating can only achieve 50-60% solid content, while the solid fraction of high-solids anti-corrosion coating can be as high as 70%-80%, even 90%-100%, solvent reduction Half, showing good environmental performance. The solid content of heavy anti-corrosion coatings produced by Xianghe Company is more than 75%, and some even up to 90%, which not only reduces solvent pollution, but also reduces the cost of use.

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