A kind of heat-curable powder coating composition and preparation method thereof
A technology for powder coatings and compositions, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of inability to produce powder coating compositions, no coatings, etc.
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[0231] Correspondingly, see figure 2 , the present invention also discloses a preparation method of a thermally curable powder coating composition, comprising:
[0232] S101, dividing the D component into two F components and G components with the same or different weights;
[0233] According to the formulation of the powder coating composition, a certain amount of D component is selected, and D component is divided into two F components and G components with the same weight or different weights. Based on the total added amount of component D, the content of component F is in the range of 1-35wt%, and the content of component G is in the range of 1-35wt%. Preferably, based on the total amount of component D added, the amount of component F is 5-30wt% of the total amount of component A, component B and component C, and the amount of component G is the 5-30wt% of the total amount of the A component, B component and C component. More preferably, based on the total amount of c...
Embodiment 1
[0263] Take 204g of component A M-BES, which is an active hydrogen donor for Michael addition reaction. Then take B component M-XS-2181g, which is the acceptor of Michael addition reaction. Take 50.35g of catalyst EA-1 prepared above, 6g of triglycidyl isocyanurate TGIC; take 51g of C component M-C30-1, which is the reaction diluent. Mix the above materials evenly. The temperature of the extruder was set at 100° C. and the rotation speed was 300 rpm. Extrude the material through an extruder, then cool the extrudate, crush the cooled material with a coffee grinder, and sieve to prepare a powder coating with an average particle size of 30 μm, that is, the first powder particle P1.
[0264] The triglycidyl isocyanurate TGIC is pulverized into a powder with an average particle diameter of 15 μm by a jet mill, namely the second powder particle P2. Mix P1 and P2 evenly according to the ratio of 94:6, put them into a jet mill and pulverize them. Control the average particle size ...
Embodiment 2
[0275] Take A-component polyester resin M-BES 204g, this is the Michael addition reaction active hydrogen donor. Then take 181g of B component M-XS-2, which is the acceptor of Michael addition reaction. 50.35g of catalyst EA-1 prepared above, 12g of solid epoxy resin with an epoxy equivalent of 200; take 51g of C component M-C30-1, which is the reaction diluent. Mix the above materials evenly, set the temperature of the extruder to 100° C., and the rotation speed to 300 rpm. Extrude the material through an extruder, then cool the extrudate, crush the cooled material with a coffee grinder, and sieve to prepare a powder coating with an average particle size of 30 μm, that is, the first powder particle P1.
[0276] The epoxy resin with an epoxy equivalent of 200 was pulverized into a powder with an average particle diameter of 15 μm, namely the second powder particles P2, by jet milling. Mix P1 and P2 evenly according to the ratio of 92:8, put them into the jet mill and pulveri...
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