Research progress and evaluation of functional mineral powder materials for waterborne coatings
2019-07-21 05:02:17
Institution: National Non-metallic Mineral Resources Comprehensive Utilization Engineering Technology Research Center, Zhengzhou 450006, China
Abstract: The application of functional mineral powder materials such as zeolite, tourmaline, montmorillonite and vermiculite in waterborne coatings was introduced. The properties and research progress of mineral materials and coatings were evaluated.
Introduction Waterborne coatings are an important type in the coating family. They are different from organic solvents in oily coatings. They are a general term for a wide range of coatings that use water as a dispersing solvent. They can be subdivided into acrylic acid and vinyl acetate depending on the film forming material. The homopolymerization, copolymerization or blending series of styrene, silicone, fluororesin, etc. are mainly used as interior and exterior wall coatings for architectural decoration, and their application is closely related to the living environment of human beings. With the establishment of the pillar industry status of China's national economy and the continuous improvement of people's living standards, the variety, output and consumption of waterborne architectural coatings continue to increase, and its function and quality have received much attention in recent years. According to relevant information [1], the domestic production of waterborne architectural coatings has reached 40% of the total coatings.
Water-based paints can be easily divided into two types: ordinary decorative paints and functional decorative paints. Among them, functional decorative paints not only have the decorative function of ordinary decorative paints, but also give paint some special functions. Among the water-based paint series, there are many varieties of functional coatings, such as antibacterial coatings, weathering coatings, negative ion coatings, environmental purification coatings, fireproof coatings, waterproof coatings, mildew coatings, anti-mosquito coatings, heat-resistant coatings, Elastomeric coatings, etc., can also be used to increase the special functions of coatings, but the functional decorative coatings produced by mineral powder materials are mainly antibacterial coatings, negative ion coatings, environmental purification coatings, weathering coatings, etc. The main typical mineral powder materials that function are zeolite, tourmaline, montmorillonite, vermiculite, and the like.
Functional decorative coatings not only provide consumers with new products and consumption concepts, but also broaden the application range of waterborne coatings, increase the practicality and product grade of architectural waterborne coatings, and improve the status of waterborne coatings in building decoration materials. And the role, but also brought good economic and social benefits for the paint production enterprises, which also led to the development of the upstream mineral functional materials processing industry.
2 Typical functional mineral powder materials and functions for waterborne coatings 2.1 Zeolite 2.1.1 Structure of zeolite Zeolite is a mineral composed of siloxane tetrahedrons arranged in a three-dimensional space and connected to form a three-dimensional structure. Silicone tetrahedron Part of the silicon can be replaced by aluminum, and the silicon and aluminum tetrahedrons are connected by a common oxygen bridge to form an aggregate. Different aluminum and silicon substitution ratios and connection methods form special micropores and channels, which constitute a natural structure with different structures and varieties. Synthetic zeolite minerals (such as common A-type, X-type, Y-type, Z-type zeolite, etc.); at the same time, due to silicon, aluminum replacement, the aggregate has a certain amount of negative charge; in order to maintain the aggregate charge balance, in the micro A certain amount of metal ions such as Na+, K+, and Ca2+ are adsorbed in the pores and channels, but the interaction between the adsorbed ions is weak, and the adsorbed ions in the pores can be further stabilized by Cu2+ and Zn2+.
Substituting heavy metal ions such as Ag +, Cd2+ and Hg 2+ , the product after replacement has laid a foundation for the antibacterial action of zeolite.
The adsorption and exchange of ions in the pores of zeolite are restricted by the composition of zeolite silica-alumina, crystal structure, specific surface area, type and location of cations, adsorption and exchange environment. Different zeolites have certain selectivity and saturation for exchange between different metal ions. Sex. Taking Y-type zeolite as an example, Li+, K+, and Ag+ can completely replace Na+ in the pores of the zeolite, while Rb+ and Cs+ can only be partially substituted; when the degree of exchange is greater than 68%, the Y-type zeolite has a monovalent cation. The order of selective exchange is: Ag+>Na
+>K +>Li+ and so on.
2.1.2 Role of Zeolite in Waterborne Coatings The zeolite after heavy metal exchange treatment is mainly used as an antibacterial coating in waterborne functional coatings. The antibacterial principle is the use of zeolites to carry Cu2 + , Zn2+ , Ag + , Cd2+ Heavy metal ions such as Hg2+ denature the bacterial microbial structure, inhibiting or killing the growth of bacteria on the surface of the coating coating, and achieving the purpose of using the antibacterial coating to keep the coating self-cleaning and purifying the environment. Due to the special microporous structure of the zeolite and the selective combination of the supported metal ions and the skeleton, the antibacterial metal ions can be slowly released at a certain rate after the coating is applied, so that the coating has a long-term antibacterial effect. The antibacterial agent prepared by using the zeolite carrier has the characteristics of broad spectrum, long-lasting, safety and good stability, and provides high-quality and economical raw materials for mass production of antibacterial coatings, and also promotes research and industrial development of antibacterial mineral materials. .........
Author: Sun Yaguang, Yuli Xiu
Abstract: The application of functional mineral powder materials such as zeolite, tourmaline, montmorillonite and vermiculite in waterborne coatings was introduced. The properties and research progress of mineral materials and coatings were evaluated.
Introduction Waterborne coatings are an important type in the coating family. They are different from organic solvents in oily coatings. They are a general term for a wide range of coatings that use water as a dispersing solvent. They can be subdivided into acrylic acid and vinyl acetate depending on the film forming material. The homopolymerization, copolymerization or blending series of styrene, silicone, fluororesin, etc. are mainly used as interior and exterior wall coatings for architectural decoration, and their application is closely related to the living environment of human beings. With the establishment of the pillar industry status of China's national economy and the continuous improvement of people's living standards, the variety, output and consumption of waterborne architectural coatings continue to increase, and its function and quality have received much attention in recent years. According to relevant information [1], the domestic production of waterborne architectural coatings has reached 40% of the total coatings.
Water-based paints can be easily divided into two types: ordinary decorative paints and functional decorative paints. Among them, functional decorative paints not only have the decorative function of ordinary decorative paints, but also give paint some special functions. Among the water-based paint series, there are many varieties of functional coatings, such as antibacterial coatings, weathering coatings, negative ion coatings, environmental purification coatings, fireproof coatings, waterproof coatings, mildew coatings, anti-mosquito coatings, heat-resistant coatings, Elastomeric coatings, etc., can also be used to increase the special functions of coatings, but the functional decorative coatings produced by mineral powder materials are mainly antibacterial coatings, negative ion coatings, environmental purification coatings, weathering coatings, etc. The main typical mineral powder materials that function are zeolite, tourmaline, montmorillonite, vermiculite, and the like.
Functional decorative coatings not only provide consumers with new products and consumption concepts, but also broaden the application range of waterborne coatings, increase the practicality and product grade of architectural waterborne coatings, and improve the status of waterborne coatings in building decoration materials. And the role, but also brought good economic and social benefits for the paint production enterprises, which also led to the development of the upstream mineral functional materials processing industry.
2 Typical functional mineral powder materials and functions for waterborne coatings 2.1 Zeolite 2.1.1 Structure of zeolite Zeolite is a mineral composed of siloxane tetrahedrons arranged in a three-dimensional space and connected to form a three-dimensional structure. Silicone tetrahedron Part of the silicon can be replaced by aluminum, and the silicon and aluminum tetrahedrons are connected by a common oxygen bridge to form an aggregate. Different aluminum and silicon substitution ratios and connection methods form special micropores and channels, which constitute a natural structure with different structures and varieties. Synthetic zeolite minerals (such as common A-type, X-type, Y-type, Z-type zeolite, etc.); at the same time, due to silicon, aluminum replacement, the aggregate has a certain amount of negative charge; in order to maintain the aggregate charge balance, in the micro A certain amount of metal ions such as Na+, K+, and Ca2+ are adsorbed in the pores and channels, but the interaction between the adsorbed ions is weak, and the adsorbed ions in the pores can be further stabilized by Cu2+ and Zn2+.
Substituting heavy metal ions such as Ag +, Cd2+ and Hg 2+ , the product after replacement has laid a foundation for the antibacterial action of zeolite.
The adsorption and exchange of ions in the pores of zeolite are restricted by the composition of zeolite silica-alumina, crystal structure, specific surface area, type and location of cations, adsorption and exchange environment. Different zeolites have certain selectivity and saturation for exchange between different metal ions. Sex. Taking Y-type zeolite as an example, Li+, K+, and Ag+ can completely replace Na+ in the pores of the zeolite, while Rb+ and Cs+ can only be partially substituted; when the degree of exchange is greater than 68%, the Y-type zeolite has a monovalent cation. The order of selective exchange is: Ag+>Na
+>K +>Li+ and so on.
2.1.2 Role of Zeolite in Waterborne Coatings The zeolite after heavy metal exchange treatment is mainly used as an antibacterial coating in waterborne functional coatings. The antibacterial principle is the use of zeolites to carry Cu2 + , Zn2+ , Ag + , Cd2+ Heavy metal ions such as Hg2+ denature the bacterial microbial structure, inhibiting or killing the growth of bacteria on the surface of the coating coating, and achieving the purpose of using the antibacterial coating to keep the coating self-cleaning and purifying the environment. Due to the special microporous structure of the zeolite and the selective combination of the supported metal ions and the skeleton, the antibacterial metal ions can be slowly released at a certain rate after the coating is applied, so that the coating has a long-term antibacterial effect. The antibacterial agent prepared by using the zeolite carrier has the characteristics of broad spectrum, long-lasting, safety and good stability, and provides high-quality and economical raw materials for mass production of antibacterial coatings, and also promotes research and industrial development of antibacterial mineral materials. .........
Author: Sun Yaguang, Yuli Xiu
Mackerel are canned in many different ways. At the cannery, the fish are washed, their heads are removed, and the fish are cooked, either by deep-frying or by steam-cooking, after which they are dried. Mackerels are then packed in either brine, tomato sauce, sunflower oil and vegetable oil.
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