Powder coating having magnetic polyester resin and preparation method of powder coating
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A polyester resin and powder coating technology, applied in the field of coatings, can solve the problem of inability to apply powder and the amount of powder, and achieve the effect of increasing the powder coating rate and improving the powder coating rate.
Inactive Publication Date: 2019-12-03
ANHUI SHENJIAN NEW MATERIALS
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Since electrostatic spraying has the gravity of the powder itself, the driving force of compressed air, and the attraction of the electrostatic field (the repulsive force exists simultaneously), there will be a Faraday cage effect in electrostatic spraying. When some complex workpieces are sprayed, powder cannot be applied or the amount of powder applied is very large. less phenomenon
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Embodiment 1
[0014] Present embodiment coating comprises the component of following mass parts:
[0015] Magnetic polyester resin: 45
[0016] TGIC: 2.87
[0017] Leveling agent GLP588: 1.2
[0018] Pigments: 25
[0019] Inorganic filler barium sulfate: 20.93
[0020] Auxiliary benzoin: 5
Embodiment 2
[0022] Present embodiment coating comprises the component of following mass parts:
[0023] Magnetic polyester resin: 60
[0024] TGIC: 3.83
[0025] Leveling agent GLP588: 1
[0026] Pigments: 18
[0027] Inorganic filler barium sulfate: 13.17
[0028] Auxiliary brightener: 4
Embodiment 3
[0030] Present embodiment coating comprises the component of following mass parts:
[0031] Magnetic polyester resin: 75
[0032] TGIC: 4.79
[0033] Leveling agent GLP588: 0.8
[0034] Pigments: 10
[0035] Inorganic filler barium sulfate: 4.41
[0036] Auxiliary Degasser: 5
[0037] The preparation method of the magnetic polyester resin in the above examples is as follows: 1251 parts by mass of neopentyl glycol, 120 parts of ethylene glycol and 100 parts of 2-methyl-1,3 propanediol are put into a reaction kettle, heated to 120°C and melted , stir, then add 2200 parts of terephthalic acid, 120 parts of isophthalic acid and 5 parts of esterification catalyst, heat to 245 ° C to maintain the reaction until the reactant is clear, take a sample, the acid value of the test sample is 13.4mgKOH / g, the viscosity It is 1100mPa.s; cool down to 230°C, then add 300 parts of isophthalic acid, 21 parts of succinic acid and 60 parts of adipic acid, raise the temperature to 245°C and ma...
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Abstract
The invention aims to provide a powder coating having magnetic polyester resin and a preparation method of the powder coating. The powder coating is prepared by a combination of the magnetic polyesterresin, TGIC, a levelling agent, a pigment, an inorganic filler and an auxiliary agent. Compared with a traditional powder coating, when electrostatic spraying is performed, the powder coating provided by the invention can overcome a Faraday cage effect, makes simple workpieces have a greatly improved coating rate when spray coating is performed, and makes complex workpieces, grooves and internalcorners coated effectively to form a complete coating film; and when the powder coating prepared from the magnetic polyester resin is electrostatically sprayed, after the front end of an electrostaticspray gun generates corona discharge, ferroferric oxide in the polyester resin is magnetic and forms magnetic attraction with a sprayed workpiece, the repulsive force of the Faraday cage effect is overcome, so that the powder coating is easily adsorbed onto the complex workpieces, the grooves and the internal corners, and the coating rate of the powder coating is greatly improved.
Description
technical field [0001] The invention relates to the technical field of coatings, in particular to a powder coating with magnetic polyester resin and a preparation method thereof. Background technique [0002] With people's awareness of environmental protection and the country's emphasis on environmental protection, powder coatings, as an environmentally friendly coating, are more and more widely used, and the quality of powder is getting better and better, but it is limited by the limitations of the spraying process, and some complex workpieces can be sprayed. There are also some defects that it is difficult to apply powder, or even not powdered, resulting in incomplete coating film and losing the function of protecting the substrate. At present, spraying powder coating mainly includes electrostatic spraying method, friction gun spraying method, roller coating method and fluidized bed method. Among them, the roller coating method and the fluidized bed method belong to the h...
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