Gel point control method in synthesis technology of polyester for powder coatings

The invention discloses a gel point control method in a synthesis technology of polyester for powder coatings. In the process of preparing the polyester through reaction of polybasic acid and polyhydric alcohol, the reaction degree is controlled by determining the hydroxyl value or acid value in rea...

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Bibliographische Detailangaben
Hauptverfasser:	MA JIANPO, GUO FUQUAN, LI RISHENG, ZHU XINJUN, XU QINGLI, SHI ZHIWEI
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON CORRECTING FLUIDS DYES FILLING PASTES INKS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The invention discloses a gel point control method in a synthesis technology of polyester for powder coatings. In the process of preparing the polyester through reaction of polybasic acid and polyhydric alcohol, the reaction degree is controlled by determining the hydroxyl value or acid value in real time at the condensation polymerization stage, so that the system is controlled to end the reaction before the gel point, and gel generation is avoided. The gel point control method in the synthesis technology of the polyester for the powder coatings has the advantages that the technology is simple, curing efficiency is high, crosslinking point density is large, and the reaction system can be effectively controlled in real time.