News Details
The coating is made of pure epoxy system
2017-5-3 16:27:31
The coating is made of pure epoxy system. Epoxy powder coating is the earliest developed thermosetting powder coating. A variety of epoxy powder coating products can be obtained by means of different types of crosslinking agents, such as amines, organic acids or anhydride and phenols. So it still occupies the dominant position in many large area coating, protective coating, functional powder coating application and so on. In many of the available epoxy powder crosslinking agent, and can realize low temperature/fast crosslinked varieties, so epoxy system in the field of low temperature/quick crosslinking also has fairly good prospects.
Containing epoxy groups of epoxy resin is the film-forming resin epoxy powder system, bisphenol A is the most commonly used in the two glycidyl ether oligomer, that is, known as E - 12. In order to form an insoluble three-dimensional network coating, it is necessary to coordinate the linear epoxy resin with appropriate crosslinking agent. The crosslinking agent for epoxy resin is the first compound that can produce crosslinking reactions with epoxy in resin. Based on the ability to react with epoxy in the crosslinking agent
Different from the active groups, the epoxy crosslinking agent can be classified as amines containing amines, compounds containing carboxyl, and compounds containing hydroxyl. The following will introduce several kinds of epoxy crosslinking agents which can be used in powder coatings and their development in low temperature crosslinking.
Droplets in contact with the solid surface molecules are attractive depends on their position, in order to achieve balance, system toward minimizing the free energy of per unit area, as a result, the surface to minimize classic droplets. According to the famous Young equation, these three interfacial forces are in equilibrium: gamma sv = gamma sl + gamma lvcos theta
In which gamma sv = surface tension of the substrate in which the vapor in the powder coating is exposed
Gamma lv = powder coating with the surface tension of the vapor in itself
Gamma sl = the interfacial tension between powder coating and substrate
Theta = contact Angle is the Angle between the tangent of the liquid drop surface and the surface of the solid.
Cos theta = (gamma sv-gamma sl)/gamma lv
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Known as the infiltration Angle, > 90 ° said liquid infiltration not solid surface; < 90 ° can said liquid wetting solid surface, = 0 ° = 1 liquid can fully wetting solid surface. As a result, gamma sv tries to spread the liquid along the substrate surface, while gamma and gamma lv try to contract the liquid. So, reduce molten powder coating and surface tension between the gas gamma lv, reduce molten powder between the substrate and the surface tension of the gamma sl can promote the invasion and spreading of powder coating to the substrate.
The Nix and Dodge equations quantitatively give the influence of the powder particles in the fusion phase. The Orchard equation describes the effects of the combined phase of the flow. Are two process, and the results show that the high surface tension and low viscosity to flow, but on the other hand, low surface tension and increase the wettability, spreading molten coating on the substrate, thereby reducing defects, at the same time, the melt viscosity is too low will lead to flow to hang and so on. Therefore, it is necessary to combine the two counterfactors to balance the ultimate performance in practice.
For solvent-based coating with the evaporation of the solvent, the surface tension of the coating surface can form high and surface viscosity will increase with the volatilization of solvent, also reduces the surface temperature of the heat along with, so will cause the lower level is poor, the surface tension of the temperature difference and the difference of viscosity, these comprehensive factors resulted in the imbalance of film up and down, up and down in order to make the system to maintain balance will have the impetus, keeps up and paint flow until the final viscosity to stop the flow.
At this point the surface tension disappears, resulting in the surface of the final flattening. In fact in the coating can form irregular flow balance in the up and down, the edge of the hexagonal network, also known as the benard cell (boehner eddy current), source point located in the central part of cellular (low surface tension), and the coating is piled up to the edge of the cell (high surface tension).
Because this convection causes the current to rise around the vortex, if the coating is illiquid, it will see the orange peel phenomenon. This is related to the surface tension gradient and wettability of the coating. When coating viscosity is low and the coating is thicker, it is not obvious when the viscosity increases and the film thickness is reduced.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Containing epoxy groups of epoxy resin is the film-forming resin epoxy powder system, bisphenol A is the most commonly used in the two glycidyl ether oligomer, that is, known as E - 12. In order to form an insoluble three-dimensional network coating, it is necessary to coordinate the linear epoxy resin with appropriate crosslinking agent. The crosslinking agent for epoxy resin is the first compound that can produce crosslinking reactions with epoxy in resin. Based on the ability to react with epoxy in the crosslinking agent
Different from the active groups, the epoxy crosslinking agent can be classified as amines containing amines, compounds containing carboxyl, and compounds containing hydroxyl. The following will introduce several kinds of epoxy crosslinking agents which can be used in powder coatings and their development in low temperature crosslinking.
Droplets in contact with the solid surface molecules are attractive depends on their position, in order to achieve balance, system toward minimizing the free energy of per unit area, as a result, the surface to minimize classic droplets. According to the famous Young equation, these three interfacial forces are in equilibrium: gamma sv = gamma sl + gamma lvcos theta
In which gamma sv = surface tension of the substrate in which the vapor in the powder coating is exposed
Gamma lv = powder coating with the surface tension of the vapor in itself
Gamma sl = the interfacial tension between powder coating and substrate
Theta = contact Angle is the Angle between the tangent of the liquid drop surface and the surface of the solid.
Cos theta = (gamma sv-gamma sl)/gamma lv
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Known as the infiltration Angle, > 90 ° said liquid infiltration not solid surface; < 90 ° can said liquid wetting solid surface, = 0 ° = 1 liquid can fully wetting solid surface. As a result, gamma sv tries to spread the liquid along the substrate surface, while gamma and gamma lv try to contract the liquid. So, reduce molten powder coating and surface tension between the gas gamma lv, reduce molten powder between the substrate and the surface tension of the gamma sl can promote the invasion and spreading of powder coating to the substrate.
The Nix and Dodge equations quantitatively give the influence of the powder particles in the fusion phase. The Orchard equation describes the effects of the combined phase of the flow. Are two process, and the results show that the high surface tension and low viscosity to flow, but on the other hand, low surface tension and increase the wettability, spreading molten coating on the substrate, thereby reducing defects, at the same time, the melt viscosity is too low will lead to flow to hang and so on. Therefore, it is necessary to combine the two counterfactors to balance the ultimate performance in practice.
For solvent-based coating with the evaporation of the solvent, the surface tension of the coating surface can form high and surface viscosity will increase with the volatilization of solvent, also reduces the surface temperature of the heat along with, so will cause the lower level is poor, the surface tension of the temperature difference and the difference of viscosity, these comprehensive factors resulted in the imbalance of film up and down, up and down in order to make the system to maintain balance will have the impetus, keeps up and paint flow until the final viscosity to stop the flow.
At this point the surface tension disappears, resulting in the surface of the final flattening. In fact in the coating can form irregular flow balance in the up and down, the edge of the hexagonal network, also known as the benard cell (boehner eddy current), source point located in the central part of cellular (low surface tension), and the coating is piled up to the edge of the cell (high surface tension).
Because this convection causes the current to rise around the vortex, if the coating is illiquid, it will see the orange peel phenomenon. This is related to the surface tension gradient and wettability of the coating. When coating viscosity is low and the coating is thicker, it is not obvious when the viscosity increases and the film thickness is reduced.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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