| abstract |
FIELD: chemistry.SUBSTANCE: invention relates to a thermosetting composition of a coating powder, suitable for hardening at a temperature of 60-130°C. The composition includes a thermal initiation system and a resin system, in which a reaction ability of the thermal initiation system is such that the thermal initiation system ensures gelation time 2.5-1000 minutes at 60°C in butanedyol-dimethacrylate with determination in accordance with DIN 16945 with application of 1 wt % of the thermal initiation system in 99 wt % of butanedyol-dimethacrylate, and in which the quantity of the thermal initiation system is selected in such a way that when the composition of the coating powder is applied on a substrate and hardens at a temperature of 130°C for 20 min, the obtained coating sustains, at least, 50 double steps with abrasion in acetone. The resin system includes resin and a common cross-linking agent, in which resin contains reactionable nonsaturation, and in which the said reactionable nonsaturation represents double carbon-carbon bonds, bound directly to an electron-acceptor group. The common cross-linking agent is selected from a group of acrylates, methacrylates, vinyl esters, vinyl ethers, vinylamides, alkyne ethers, alkyne esters, alkyne amides, alkyne amines, propargyl ethers, propargyl esters, itaconates, enamines and their mixtures. Weight per the double bond in the resin system constitutes 100-1000 g/mol by determination with application ofH NMR, weight per nonsaturation in the common cross-linking agent constitutes 150-870 g/mol by determination with application ofH NMR. The composition of the coating powder is a single-component system. Also described is a method of obtaining the coating powder, a method of a substrate coating, the substrate and application of the coating powder composition for coating the thermosensitive substrate.EFFECT: coating powder compositions by the invention combine an ability to hardening at a low temperature with good processability in an extruder without gel formation.43 cl, 12 tbl, 7 ex |