Since the beginning of the 1990s, the developed countries of the world have carried out a "green revolution" and promoted the development of the paint industry to make great strides in the direction of "green" coatings. Take industrial anti-corrosion coatings as an example. In 1992, the percentage of conventional solvent-based paints in North America accounted for 49%, and it dropped to 26% in 2000. Water-based paints, high-solids coatings, photo-curable coatings, and powder coatings rose from 51% in 1992 to 2002. 74% of the year. In Europe, conventional solvent-based coatings will drop from 49% in 1992 to 27% in 2002; while waterborne coatings, high-solids coatings, photocurable coatings and powder coatings will increase from 51% in 1992 to 73% in 2002. Heavy-duty coatings are moving in the direction of high performance, high efficiency, low energy consumption, and low pollution. The development of good high corrosion resistance resins and new pigments and fillers is the key to the development of heavy anti-corrosion coatings. Careful surface cleaning of coated substrates is the basis for the lifespan of heavy anti-corrosion coatings, scientific coating design requirements, and coating support. The scheme, painting construction technology, strict quality inspection and maintenance management are the guarantee for the anti-corrosion effect of heavy anti-corrosion coatings.
Water-based epoxy coating uses epoxy resin water emulsion as epoxy component, water-soluble amine as curing agent, and is formulated as a two-component waterborne epoxy resin anticorrosive primer. It is suitable for non-underwater applications that require extremely strict solvent distribution. Steel structure, and in the hardness, corrosion resistance, construction matching and other aspects have the performance equivalent to solvent-based epoxy paint, effectively reducing the VOC content, is the development direction of anti-corrosion coatings. Typical water-emulsion epoxy anti-corrosion coatings use styrene, acrylic acid and its esters as monomers, epoxy resins as modifiers, mixed emulsifiers using nonionic and anionic surfactants, and potassium persulfate as an initiator. Emulsion polymerization gave epoxy resin and acrylic resin emulsion. After the coating, the crosslinking reaction between the carboxyl group of acrylic acid and the epoxy group of the epoxy resin causes the coating to be cured and formed into a film, which has the advantages of acrylic resin and epoxy, and has good water resistance and resistance. Heat, light resistance, but also has good adhesion, solvent resistance and other advantages.
The biggest feature of water-dispersed anti-corrosion coatings is the use of water as the main solvent instead of xylene, gasoline and other solvents in common coatings, which not only reduces costs, but also reduces environmental pollution, and can be fire-proof and easy to transport and store, so it has broad application prospects. [18]. Experiments by Cui Dawei and others of the Beijing Nonferrous Metal Research Institute have proved that the hydrophilic groups on the resin can form organic salts with organic salt forming agents at room temperature, so that the resin has good water solubility; and in high temperature baking conditions In the next, salt-forming agents can evaporate relatively quickly, and certain specific groups on the resin can interact with hydrophilic groups, so that the film-forming cured resin contains almost no hydrophilic groups. Under the joint action of other additives, the final The film exhibits hydrophobic properties. Based on this principle, a water-based anti-corrosion coating that is resistant to high temperature alkaline water corrosion has been developed. Most epoxy resins are insoluble in water and only soluble in organic solvents such as aromatic hydrocarbons and ketones. The disadvantages of inflammable, explosive, toxic, and environmental pollution of organic solvents have caused inconvenience to storage, transportation and construction. With the increasing awareness of environmental protection, waterborne epoxy resins using water as the solvent or dispersion medium have received increasing attention. It is also one of the development directions of epoxy resin applications because of its good workability, construction on wet surfaces, low construction environment requirements, convenient cleaning, safe storage, transportation, and use, and low price.
Water-based epoxy coating uses epoxy resin water emulsion as epoxy component, water-soluble amine as curing agent, and is formulated as a two-component waterborne epoxy resin anticorrosive primer. It is suitable for non-underwater applications that require extremely strict solvent distribution. Steel structure, and in the hardness, corrosion resistance, construction matching and other aspects have the performance equivalent to solvent-based epoxy paint, effectively reducing the VOC content, is the development direction of anti-corrosion coatings. Typical water-emulsion epoxy anti-corrosion coatings use styrene, acrylic acid and its esters as monomers, epoxy resins as modifiers, mixed emulsifiers using nonionic and anionic surfactants, and potassium persulfate as an initiator. Emulsion polymerization gave epoxy resin and acrylic resin emulsion. After the coating, the crosslinking reaction between the carboxyl group of acrylic acid and the epoxy group of the epoxy resin causes the coating to be cured and formed into a film, which has the advantages of acrylic resin and epoxy, and has good water resistance and resistance. Heat, light resistance, but also has good adhesion, solvent resistance and other advantages.
The biggest feature of water-dispersed anti-corrosion coatings is the use of water as the main solvent instead of xylene, gasoline and other solvents in common coatings, which not only reduces costs, but also reduces environmental pollution, and can be fire-proof and easy to transport and store, so it has broad application prospects. [18]. Experiments by Cui Dawei and others of the Beijing Nonferrous Metal Research Institute have proved that the hydrophilic groups on the resin can form organic salts with organic salt forming agents at room temperature, so that the resin has good water solubility; and in high temperature baking conditions In the next, salt-forming agents can evaporate relatively quickly, and certain specific groups on the resin can interact with hydrophilic groups, so that the film-forming cured resin contains almost no hydrophilic groups. Under the joint action of other additives, the final The film exhibits hydrophobic properties. Based on this principle, a water-based anti-corrosion coating that is resistant to high temperature alkaline water corrosion has been developed. Most epoxy resins are insoluble in water and only soluble in organic solvents such as aromatic hydrocarbons and ketones. The disadvantages of inflammable, explosive, toxic, and environmental pollution of organic solvents have caused inconvenience to storage, transportation and construction. With the increasing awareness of environmental protection, waterborne epoxy resins using water as the solvent or dispersion medium have received increasing attention. It is also one of the development directions of epoxy resin applications because of its good workability, construction on wet surfaces, low construction environment requirements, convenient cleaning, safe storage, transportation, and use, and low price.
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