纳米羧甲基淀粉在微涂纸中的应用

摘要

采用双螺杆挤压技术制备了纳米羧甲基淀粉(NCMS),并研究其作为涂布胶黏剂用于微量涂布纸的性能,结果表明:颗粒达纳米级,且颗粒平面较平整;NCMS和氧化淀粉均为负电性,且NCMS的负电荷密度较低;NCMS具有优良的成膜性,且膜强度高,拉伸强度4.67 MPa,断裂伸长率为26.9%.NCMS取代氧化淀粉制备轻涂纸涂料,能显著提高涂料的保水性能,当NCMS用量14%时,涂料的保水值为43.6 g/m2,涂布纸的印刷表面强度为0.89 m/s,纸页的纵向抗张指数为47.8(N·m)/g,横向抗张指数为21.7(N·m)/g,油墨吸收性为36.8%,印刷光泽度61%.与20%普通氧化淀粉相比,保水性能提高25.3%,涂料的黏度下降12.4%,制得的涂布纸的印刷表面强度、抗张强度均有不同程度提高.%In this study, the nano carboxymethy starch(NCMS) was prepared by dual screw extrusion and was used as coating adhesive in micro weight coated paper ( MWC ) .The results showed that the surface of NCMS particle was smooth and it had excellent film-forming and high film strength .The tensile strength of film can reach to 4.67 MPa,breaking elongation 26.9%. The negative charge density of NCMS is lower than that of common oxidized starch .For the paper coating formula of micro weight coated paper , when the dosage of NCMS used as the coating adhesive was 14%, the water retention properties of coating was increased evidently and the water retention value was 43.6 g/m2;the IGT printing surface strength of MWC was 0.89 m/s;the longitudinal and transverse tensile index was 47.8 and 21.7( N· m)/g separately; the ink absorption of MWC was 36.8% and 61%separately.Comparing with 20%common oxidized starch coating formulation ,the water retention properties of coating was increased by 25.3%, coating viscosity was decreased by 12.4%, and the IGT printing surface strength and tensile index of MWC were improved in different degree .