基于自由基沉淀聚合法的超细包覆有机颜料的制备

Preparation of ultrafine encapsulated pigment dispersion by free-radical sediment polymerization

为提高有机颜料的耐光和耐气候牢度,改善有机颜料与基材的相容性,拓宽有机颜料的应用领域,采用聚合物包覆的方法对有机颜料进行表面改性。采用自由基沉淀聚合法在有机颜料黄13(P.Y.13)表面包覆苯乙烯马来酸(PSMA)共聚物,研究PSMA结构对包覆颜料性能的影响。结果表明,聚合单体用量、聚合单体配比和引发剂用量对包覆P.Y.13的粒径和接触角有显著影响。当聚合单体的质量为P.Y.13的24%,马来酸与苯乙烯物质的量比为1∶1,引发剂的质量为聚合单体的0.8%时,所制备包覆颜料的粒径较大,包覆层较厚,包覆颜料分散体稳定性较好。红外光谱(IR)和透射电镜(TEM)证实P.Y.13表面包覆了PSMA。

Polymer encapsulating method was adopted for the surface modification of organic pigment with the purposes of improving the lightfastness and weather fastness of the pigment,enhancing its compatibility with the substrate,and broadening the application field of the pigment.In this study,ultrafine C.I.Pigment Yellow 13 /poly-styrene-maleic acid（P.Y.13 /PSMA composite） dispersion was prepared by free-radical precipitation polymerization.The effects of PSMA structure on the property of the encapsulated pigment were investigated.Experimental results revealed that the weight ratio of feeding monomers to pigment（WC/P）,the molar ratio of feeding maleic acid to styrene（Mm/s） and the weight ratio of feeding initiator to monomer（Wi/c） in aqueous medium had significant influences on particle size and contact angle of the P.Y.13 /PSMA composite dispersion.The optimal P.Y.13 /PSMA composite dispersion was achieved when using WC/P at 24%,Mm/s at 1.0 and Wi/c at 0.8%.Fourier transform infrared（FTIR） spectra and transmission electron microscopy（TEM） demonstrated that P.Y.13 was successfully encapsulated with PSMA.