The process of making powder coatings

 Powder coating as a new solvent-free 100% solid powder coating. It has the characteristics of solvent-free, non-polluting, recyclable, environmental protection, saving energy and resources, reducing labor intensity and coating mechanical strength.
it has two main categories: thermoplastic powder coatings (PE) and thermosolytic powder coatings
in
. The following describes the production process of a thermoo-solid powder coating.
thermoclytic powder coating refers to the thermostat resin as a film-forming substance, added to the cross-linking reaction of the curing agent after heating can form a non-melting hard texture coating. The coating does not soften like a thermoplastic coating at a higher temperature, but only breaks down.
Because the resin used in the thermoset powder coating is a pre-polymer with low polymerization and lower molecular weight, the coating has better leveling, good decoration, and the pre-polymer of low molecular weight can form a mesh cross-linking large molecule, so the coating has better corrosion resistance and mechanical properties. Therefore, the thermoo-solid powder coatings are developing particularly rapidly.
production process of thermoset powder coating
wred material preparation---- premixed---- molten extrusion---- cooling grinding---- oversieve---- finished packaging
production process
1 Preparation of ambigular polyester
adds 423.4 new glycols to a thermocouple reactor equipped with agitator, distillation column connected to a water-cooled condenser, nitrogen inlet and temperature regulator.
is heated to 130 degrees C by nitrogen stirring, with 719.6 servings of benzoic acid and 2.5 servings of trionic acid orthotintinin, gradually heated to 230 degrees C, starting at 180 degrees C Water is distilled from the reactor, and the acid value of the product obtained by the 230c reaction 3h is 34mg KOH/g, the hydroxyl value is 3mg KOH/g, and the viscosity is 2100mpa.s (6 preparation of
2 semicrystalline polyester
532.1 servings of 1,4-cyclohexane methanol, 15.9 copies of trihydroxy methamphetamine, 591 .3 servings of hetic acid and 2.5 servings of trionic acid butyl tin are added to a thermocouple reactor equipped with agitator, a distillation column connected to a water-cooled condenser, a nitrogen inlet and a temperature regulator.
is stirred with nitrogen to 140 degrees C, at which point the water begins to distill and gradually heats up to 220 degrees C.
When distillation stops at atmospheric pressure, add 1.0 servings of triglycerides and 1.0 servings of trionic acid orthotintin, and gradually add a vacuum of 6.67kpa, reacting to 5h at 220 degrees C.
the resulting product is 22mg KOH/g, hydroxyl is 3mg KOH/g, viscosity is 6500mpa.s (220C)
3
3C Preparation of oleic acid co-polymers
adds 80 servings of orthyl acetate to a thermocouple reactor equipped with agitator, distillation column connected to a water-cooled condenser, nitrogen inlet and temperature regulator. Heat and stir continuously, while blowing with nitrogen. At 125 degrees C, a mixture of 0.8 servings of statin peroxide in 20 servings of orthyl butyl lipids was added to 215min. After starting 5min, 22 styrenes, 24 styrene glycerides and 40 methamphetamines were added, with a total reaction time of 315min.
, after steaming out butyl acetate, the ICI200 degrees C viscosity of acrylic co-polymers is 1600 mpa.s
4
4 synthetic
The product is mixed with curing agent and pigment dry mix, and then the two screw extruder is used to melt and equalize at 85 degrees C, cool, add to the grinder for grinding, and then the powder is screened and packaged according to particle size requirements.