【摘要】 以丙烯酸丁酯(BA)、醋酸乙烯酯(VAc)、丙烯酸(AA)单体为基础,采用双丙酮丙烯酰胺(DAAM)/己二酸二酰肼(ADH)外交联体系,通过预乳化和半连续加料工艺制备了外交联型丙烯酸酯乳液压敏胶。采用红外光谱(FTIR)、透射电镜(TEM)、热重分析(TGA)等手段对其进行了表征和分析。并研究了软硬单体配比〔m(BA)∶m(VAc)〕、官能单体(AA)用量及外交联体系(DAAM/ADH)用量对压敏胶性能的影响。结果表明,通过调节软硬单体配比和官能单体用量可以使压敏胶性能达到一个较优的水平。当m(BA)∶m(VAc)=85∶15,w(AA)=3%时,压敏胶初粘力为17号球,180°剥离强度为504 N/m,室温持粘力>30 d,高温(100℃)持粘力为140 min。外交联体系DAAM/ADH的引入可以在对初粘力和180°剥离强度影响较小的情况下显著提高压敏胶的高温持粘力到540 min,从而得到高温持粘力优异的外交联型丙烯酸酯乳液压敏胶。更多还原

【Abstract】 A series of post cross-linked acrylic emulsion adhesives were synthesized by pre-emulsion technology and semi-continuous emulsion polymerization.Butyl acrylate(BA),vinyl acetate(VAc) and acrylic acid(AA) were used as main monomers and diacetone-acrylamide(DAAM) /adipic dihydrazide(ADH) as post cross-linker.The emulsion polymer was characterized by means of Fourier transform infrared(FTIR) analysis,transmission electron microscopy(TEM) and thermo-gravimetric analysis(TGA).The polymer structures and the cross-linking between emulsion particles have been characterized by means of FTIR spectroscopy and TEM photographs,respectively.TGA indicated its potential use in the environment of high temperature.The corresponding pressure sensitive adhesive(PSA) tapes with a thickness of 50 μm were prepared.Their properties,including tack,180° peel strength,and shear strength at room temperature and 100 ℃,and the influence of m(BA):m(VAc),AA content and DAAM/ADH content on those properties were studied.The results show that the best properties were obtained when m(BA):m(VAc) was 85:15 and AA content was 3%.The tack ball size was 17,180° peel strength was 504 N/m,room temperature shear strength was more than 30 d,and 100 ℃ shear strength was 140 min.Further introduction of DAAM/ADH significantly improved 100 ℃ shear strength of the PSA tapes to 540 min at little sacrifice of their tack property and 180° peel strength,which could be explained by the mechanism of post cross-linking.更多还原