Development and Research of High Performance Clearcoat with Ultra-Curing(Fast Drying)for Automotive Refinish
The main problems and solutions of fast drying clearcoat for automotive refinish were discribed.A polyol ultra-curing resin synthesized from p-hydroxybenzoic acid as hydroxyl monomer is used as the main resin in addition to the hyperbranched polyester HPE as the auxiliary resin,the dibutyltin dilaurate(T-12)as drying agent,the MAK and EEP with high dissolving power and low volatilization rate as main solvent to prepare the clearcoat.The hardener is prepared using Bayer 4470 and BasfHI-100 at a ratio of 1:6.The mixed composition of the clearcoat and the hardener has long activation period and slow dust-free drying time,meanwhile,it can be sprayed on a whole carbody surface.The cured film shows fast drying behavior and good hardness and crosslink density.The clearcoat has good prospects in the field of automotive refinish.
resinhyperbranched polyesterdibutyltin dilauratevolatilization ratespray for whole carbodycrosslink densityquick refinish
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