醇溶性疏水交联型丙烯酸酯环保胶黏剂的制备与表征

Preparation and characterization of alcohol-soluble,hydrophobic and crosslinked acrylate environmental adhesive

以乙醇为溶剂,N,N’-亚甲基双丙烯酰胺为交联单体,丙烯酸十八酯为长链疏水单体,通过溶液聚合制备了一种丙烯酸酯环保胶黏剂。通过1HNMR,FTIR,GPC,SEM,TGA等对聚合物的结构和性能进行表征与测试。研究了反应时间、反应温度、交联单体和疏水单体的用量以及硬软单体物质的量比对聚合物和膜性能的影响。结果表明,当反应时间为4 h,反应温度为80℃,交联单体含量为1%(占单体总质量,下同),硬软单体物质的量比为2∶1时,聚合物重均相对分子质量为1.286×10^(5),热分解温度为309.3℃,玻璃化转变温度为85.2℃,胶膜硬度达到4H。疏水单体的加入提高了聚合物膜的拉伸强度和疏水性能,与没加疏水单体相比,加入3%疏水单体后,胶膜的拉伸强度提高了184.2%,达到0.79MPa;水接触角提高219.5%,达到78.6°。制备的环保型胶黏剂可用于含沙土壤的固化以及沙画、沙瓶画和浮雕画的固定等。

An environmental acrylate adhesive was prepared by solution polymerization using ethanol as solvent,N,N′-methylenebisacrylamide(MBA)as crosslinking monomer,octadecyl acrylate as long-chain hydrophobic monomer.The structure and properties of polymer were characterized by 1 HNMR,FTIR,GPC,SEM and TGA.The effects of reaction time,reaction temperature,dosage of crosslinking monomer,dosage of hydrophobic monomer and molar ratio of hard monomer to soft monomer on the polymer and polymer film were studied.The results showed that under the conditions of reaction time of 4 h,reaction temperature of 80℃,crosslinking monomer of 1%(based on the total mass of monomers,the same below),molar ratio of hard monomer monomer to soft monomer of 2∶1,the prepared polymer had a weight-average relative molecular mass of 1.286×10^(5),thermal decomposition temperature of 309.3℃,glass transition temperature of 85.2℃ and the film hardness reached to 4 H.The addition of hydrophobic monomer increased the tensile strength and hydrophobicity of the film.When hydrophobic monomer dosage was 3%,the tensile strength and water contact angle of the film was 0.79 MPa and 78.6°,which improved 184.2% and 219.5%,respectively,compared with no hydrophobic monomer.The prepared adhesive could be used for the solidification of sandy soil and the fixation of sand paintings,sand bottle paintings and relief paintings.