News Details
Hydrophobic coating crosslinking agent
2017-6-10 15:27:39
Hydrophobic coating crosslinking agent
The ability of stain resistance is a common defect of traditional exterior wall paint, and it restricts its application to a certain extent. As a result, the coating that has self-cleaning function is a hot spot for research and development.
Clean contaminated needs not only high inputs such as building exterior wall, and the use of surfactants can cause serious pollution to the environment, thus has the function of self-cleaning effect coating arises at the historic moment.
Self-cleaning coatings to outdoor objects with the aid of the natural conditions such as rain erosion surface is clean, not only can reduce maintenance costs, reduce the demand for labor to minimize pollution to the environment at the same time, can be widely used in high-rise building, curtain wall, bridge and vehicle, wind power and other fields.
Crosslinking agents are mainly used in polymers. Because the molecular structure of the polymer materials as one long line, not crosslinked intensity at the low, easy to break, and there is no elastic, the effect of crosslinking agent is to produce chemical bonds between the molecules of the form, the linear molecules each other together, form a mesh structure.
The foundation of hydrophobic self-cleaning coating. Is common in nature through the formation of hydrophobic surface to achieve the phenomenon of self cleaning function, such as represented by lotus leaves and flowers of many kinds of plants, insects, the legs and wings are showing low adhesion, self-cleaning ability, this phenomenon is known as the "lotus effect".
The biomimetic principle of "lotus leaf effect" is the foundation of self-cleaning technology development. In the 1970 s, the university of Bonn, Germany, plant home W.B arthlott Neinhuis and systematically studied the self-cleaning effect of lotus leaf surface, through electronic microscope found with countless microns mastoid lotus leaf surface, and its surface is covered with nanometer wax crystals.
In 2002, the Chinese academy of sciences (htma Jiang Lei etc. The study found that there are still nanostructures, lotus leaf surface micro mastoid mastoid average is 5 ~ 9 microns in diameter, each mastoid is about 124 nm in diameter distribution of their surface villus, the study also found that there is also a nano structure between the mastoid.
Numerous studies have confirmed that micron, nano-scale microscopic coarse structure and low surface energy of wax crystals, the function of the lotus leaf surface with a high water contact Angle and low rolling Angle, thus performance surplus hydrophobic self-cleaning effect.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
The self-cleaning behavior of hydrophobic coatings is derived from its high water contact Angle and low rolling Angle. When the water droplets are on the surface of the hydrophobic surface, the droplets cannot be expanded automatically, keeping their spherical state and reducing the area of contact with the coating. When the surface has a smaller Angle, droplet on the coating surface rolling and adhesion on the surface of the water pollutants was taken, which have the effect of self-cleaning.
Method of preparation of hydrophobic self-cleaning surface. Suitable surface roughness and low surface wettability can be closely related to surface microstructure. Hydrophobic preparation usually adopt silane on the surface of the water meter or fluorocarbon chain can reduce the surface, but research shows that on the smooth surface of objects through chemical method can adjust the surface does not fully realize the purpose of the super hydrophobic self-cleaning.
Therefore, it is better to realize the self-cleaning by constructing the proper microstructure and introducing low surface energy. At present, the method of preparing the hydrophobic surface of the hydrophobic effect is more than that, and the method is usually used to achieve the desired effect.
Suitable surface roughness and low surface energy are the key to realizing self-cleaning. According to the principle of "lotus effect" from the clean, achieve the way of hydrophobic self-cleaning basically has two kinds: one is the modified low surface energy materials on rough surface, usually used for the preparation of hydrophobic on the surface of the water meter low surface energy materials mainly include polysiloxane, fluorocarbon compounds and other organic matter (such as polyethylene, polystyrene, etc.); 2 it is in the building of a similar to a lotus leaf surface hydrophobic material surface coarse structure, the preparation methods with inorganic nanoparticles (such as TiO2 and SiO2, ZnO) modification, laser/plasma/chemical etching, template method, electrostatic spinning method, sol-gel, self-assembly, electrochemical deposition and chemical vapor deposition, etc.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The ability of stain resistance is a common defect of traditional exterior wall paint, and it restricts its application to a certain extent. As a result, the coating that has self-cleaning function is a hot spot for research and development.
Clean contaminated needs not only high inputs such as building exterior wall, and the use of surfactants can cause serious pollution to the environment, thus has the function of self-cleaning effect coating arises at the historic moment.
Self-cleaning coatings to outdoor objects with the aid of the natural conditions such as rain erosion surface is clean, not only can reduce maintenance costs, reduce the demand for labor to minimize pollution to the environment at the same time, can be widely used in high-rise building, curtain wall, bridge and vehicle, wind power and other fields.
Crosslinking agents are mainly used in polymers. Because the molecular structure of the polymer materials as one long line, not crosslinked intensity at the low, easy to break, and there is no elastic, the effect of crosslinking agent is to produce chemical bonds between the molecules of the form, the linear molecules each other together, form a mesh structure.
The foundation of hydrophobic self-cleaning coating. Is common in nature through the formation of hydrophobic surface to achieve the phenomenon of self cleaning function, such as represented by lotus leaves and flowers of many kinds of plants, insects, the legs and wings are showing low adhesion, self-cleaning ability, this phenomenon is known as the "lotus effect".
The biomimetic principle of "lotus leaf effect" is the foundation of self-cleaning technology development. In the 1970 s, the university of Bonn, Germany, plant home W.B arthlott Neinhuis and systematically studied the self-cleaning effect of lotus leaf surface, through electronic microscope found with countless microns mastoid lotus leaf surface, and its surface is covered with nanometer wax crystals.
In 2002, the Chinese academy of sciences (htma Jiang Lei etc. The study found that there are still nanostructures, lotus leaf surface micro mastoid mastoid average is 5 ~ 9 microns in diameter, each mastoid is about 124 nm in diameter distribution of their surface villus, the study also found that there is also a nano structure between the mastoid.
Numerous studies have confirmed that micron, nano-scale microscopic coarse structure and low surface energy of wax crystals, the function of the lotus leaf surface with a high water contact Angle and low rolling Angle, thus performance surplus hydrophobic self-cleaning effect.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
The self-cleaning behavior of hydrophobic coatings is derived from its high water contact Angle and low rolling Angle. When the water droplets are on the surface of the hydrophobic surface, the droplets cannot be expanded automatically, keeping their spherical state and reducing the area of contact with the coating. When the surface has a smaller Angle, droplet on the coating surface rolling and adhesion on the surface of the water pollutants was taken, which have the effect of self-cleaning.
Method of preparation of hydrophobic self-cleaning surface. Suitable surface roughness and low surface wettability can be closely related to surface microstructure. Hydrophobic preparation usually adopt silane on the surface of the water meter or fluorocarbon chain can reduce the surface, but research shows that on the smooth surface of objects through chemical method can adjust the surface does not fully realize the purpose of the super hydrophobic self-cleaning.
Therefore, it is better to realize the self-cleaning by constructing the proper microstructure and introducing low surface energy. At present, the method of preparing the hydrophobic surface of the hydrophobic effect is more than that, and the method is usually used to achieve the desired effect.
Suitable surface roughness and low surface energy are the key to realizing self-cleaning. According to the principle of "lotus effect" from the clean, achieve the way of hydrophobic self-cleaning basically has two kinds: one is the modified low surface energy materials on rough surface, usually used for the preparation of hydrophobic on the surface of the water meter low surface energy materials mainly include polysiloxane, fluorocarbon compounds and other organic matter (such as polyethylene, polystyrene, etc.); 2 it is in the building of a similar to a lotus leaf surface hydrophobic material surface coarse structure, the preparation methods with inorganic nanoparticles (such as TiO2 and SiO2, ZnO) modification, laser/plasma/chemical etching, template method, electrostatic spinning method, sol-gel, self-assembly, electrochemical deposition and chemical vapor deposition, etc.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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