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Powder coating is used for crosslinking agent
2017-9-1 12:17:23
Powder coating is used for crosslinking agent
In this paper, the effect of microparticle diameter crosslinking agent on the properties of powder coatings was discussed by introducing the properties of pure epoxy and pure polyester crosslinking agent in powder coatings.
The powder coating is a kind of environmental coating which is free of solvent and average particle size of 35 micron and is baked into film after electrostatic spraying. Mainly used in household appliances, steel doors and Windows, metal box and other workpieces.
With powder coating market constantly to develop and penetration, powder coatings manufacturers pay more attention to eliminate coating defects, improve coating roughness, decrease the temperature of coating crosslinked (energy saving), to achieve these, choose suitable with the micro particle size of crosslinking agent.
Through the different physical and chemical methods to the surface modification of micro particle size of crosslinking agent, to a certain extent change particles on the surface of the crystal structure to improve its reactivity, improving its dispersibility in the matrix, reinforcing and matrix interface binding force, achieve the goal of powder surface modification.
Solids are "activated" to varying degrees when they are subjected to various forms of mechanical force, such as friction, shear force and impact force. If the system only changes in physical nature and its composition and structure are invariable, it is called mechanical activation; If the structure or chemical composition of matter changes simultaneously, it is called chemical activation.
When mechanical force is very strong, so that the critical time is short of the formation of cracks in the mechanical action of the cracks of time, or the size of the particles by mechanical force is less than the formation of critical crack size, does not crack, and will produce plastic deformation and the accumulation of various defects, is the process of mechanical activation.
Micro particles due to the slip between the particles in the aggregate, the elastic deformation of particles and particle on the surface of the powders produced by lattice defects, the structure of the grain boundary irregular stress appears, the reduced fracture. After reaching the crushing equilibrium, the particle size will no longer change even if it continues to crush. But it works on particles
Chinese name: Diethyl toluene diamine(DETDA)
In this paper, the effect of microparticle diameter crosslinking agent on the properties of powder coatings was discussed by introducing the properties of pure epoxy and pure polyester crosslinking agent in powder coatings.
The powder coating is a kind of environmental coating which is free of solvent and average particle size of 35 micron and is baked into film after electrostatic spraying. Mainly used in household appliances, steel doors and Windows, metal box and other workpieces.
With powder coating market constantly to develop and penetration, powder coatings manufacturers pay more attention to eliminate coating defects, improve coating roughness, decrease the temperature of coating crosslinked (energy saving), to achieve these, choose suitable with the micro particle size of crosslinking agent.
Through the different physical and chemical methods to the surface modification of micro particle size of crosslinking agent, to a certain extent change particles on the surface of the crystal structure to improve its reactivity, improving its dispersibility in the matrix, reinforcing and matrix interface binding force, achieve the goal of powder surface modification.
Solids are "activated" to varying degrees when they are subjected to various forms of mechanical force, such as friction, shear force and impact force. If the system only changes in physical nature and its composition and structure are invariable, it is called mechanical activation; If the structure or chemical composition of matter changes simultaneously, it is called chemical activation.
When mechanical force is very strong, so that the critical time is short of the formation of cracks in the mechanical action of the cracks of time, or the size of the particles by mechanical force is less than the formation of critical crack size, does not crack, and will produce plastic deformation and the accumulation of various defects, is the process of mechanical activation.
Micro particles due to the slip between the particles in the aggregate, the elastic deformation of particles and particle on the surface of the powders produced by lattice defects, the structure of the grain boundary irregular stress appears, the reduced fracture. After reaching the crushing equilibrium, the particle size will no longer change even if it continues to crush. But it works on particles
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).
The mechanical energy will destroy the crystalline structure of the granules, the lattice strain and lattice disruption increase. Due to mechanical activation, the activity of the reactants is enhanced so that the apparent activation energy of the chemical reaction can be greatly reduced, resulting in a significant increase in the reaction rate constant.
Crosslinking agent by strong mechanical action purpose with mechanical method was carried out on the powder surface activation, to a certain extent, change the particles on the surface of the crystal structure, dissolving properties (surface amorphization), chemical adsorption and reactivity (increasing surface active or reactive), etc., so as to increase the compatibility with matrix and wettability, improving its dispersibility in the matrix, reinforcing and matrix interface binding force, achieve the goal of powder surface modification.
Instruments and equipment: European and European g SCF - 106 laser particle size analyzer, impact meter, bending tester, double helix extruder, electrostatic spraying gun, constant temperature oven
Powder coating paint film preparation: after mixing the formula obtained beforehand, the melt extrusion, crushing, sieving, and then to spray on tinplate, respectively in different temperature and time of baking in the oven crosslinking, namely model.
The preparation of film coating was carried out according to GB/T 1727 -- 1992. The impact of paint film was determined by GB/T 1732-1993. The flexural toughness of the film was measured by GB/T 1731 -- 1993. Adhesion of paint film is carried out according to GB/T 9286-1998.
Is the use of laser granulometer particles of light scattering measurement of particle size (diffraction) phenomenon, namely the light in the process, encounter particles (obstacles), there will be a part of the deviation from the original direction of propagation, the smaller the particle size, the smaller the deviation vector. The particle size of crosslinking agent was determined by using laser granulometer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The mechanical energy will destroy the crystalline structure of the granules, the lattice strain and lattice disruption increase. Due to mechanical activation, the activity of the reactants is enhanced so that the apparent activation energy of the chemical reaction can be greatly reduced, resulting in a significant increase in the reaction rate constant.
Crosslinking agent by strong mechanical action purpose with mechanical method was carried out on the powder surface activation, to a certain extent, change the particles on the surface of the crystal structure, dissolving properties (surface amorphization), chemical adsorption and reactivity (increasing surface active or reactive), etc., so as to increase the compatibility with matrix and wettability, improving its dispersibility in the matrix, reinforcing and matrix interface binding force, achieve the goal of powder surface modification.
Instruments and equipment: European and European g SCF - 106 laser particle size analyzer, impact meter, bending tester, double helix extruder, electrostatic spraying gun, constant temperature oven
Powder coating paint film preparation: after mixing the formula obtained beforehand, the melt extrusion, crushing, sieving, and then to spray on tinplate, respectively in different temperature and time of baking in the oven crosslinking, namely model.
The preparation of film coating was carried out according to GB/T 1727 -- 1992. The impact of paint film was determined by GB/T 1732-1993. The flexural toughness of the film was measured by GB/T 1731 -- 1993. Adhesion of paint film is carried out according to GB/T 9286-1998.
Is the use of laser granulometer particles of light scattering measurement of particle size (diffraction) phenomenon, namely the light in the process, encounter particles (obstacles), there will be a part of the deviation from the original direction of propagation, the smaller the particle size, the smaller the deviation vector. The particle size of crosslinking agent was determined by using laser granulometer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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