Synthesis and properties of polycaprolactone-grafted poly(ether amine)comb hyperdispersants
In order to address the issue of inadequate dispersion of silica matting powder in UV-curable coatings,a polycaprolactone-grafted poly(ether amine)comb hyperdispersants(PEA-PCL)was synthesized.The obtained PEA-PCL were analyzed by infrared spec-troscopy,nuclear magnetic hydrogen spectroscopy,and gel permeation chromatography.The obtained PEA-PCL was added into the UV curable coating containing silica matting agent,and the matte coating were cured by UV irradiation.The flexible polyetheramine back-bone in the PEA-PCL and the tertiary amine group protruding from the PEA backbone were favorable for the hyperdispersant to adsorb the matting agent.At the same time,with the increase of density of the polycaprolactone chain segment,the spatial site resistance was improved.When the molar ratio of 1,4-butanediol diglycidyl ether to N,N-dimethylethylenediamine in the synthesis of the polyether amine main chain was 1∶0.8,and the side-chain polycaprolactone had a polymerization degree of 20,the resulting comb-shaped hy-perdispersant(PEA 1∶0.8-PCL20)showed the best dispersion effect on matting agent.When the addition amount of PEA 1∶0.8-PCL20 was 10％of the matting agent mass,UV curable coating showed a Newtonian fluid characteristic,and the leveling performance was improved,with a squeegee fineness of(23±0.5)μm.In addition,the elongation at break,tensile strength,light transmission,and gloss of the UV light cured coating were also enhanced.
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