纳米TiO2复合荧光增白剂的制备及其在纸张中的应用

Preparation of Nano TiO2 Composite Fluorescent Whitening Emulsion and Its Application in the Paper

关键词:  高得率浆  三嗪氨基二苯乙烯型荧光增白剂  纳米TiO₂  白度  返黄抑制

Key Words:high yield pulp  triazine amino stilbene fluorescent whitening agent  nano TiO₂  whiteness  yellowing inhibition

摘要:以4,4-二氨基-2,2-二磺酸二苯乙烯（DSD酸）为母体，三聚氯氰为桥联剂，制备了三嗪氨基二苯乙烯型荧光增白单体（FBs）；再将FBs、丙烯酰胺、苯乙烯与改性纳米TiO₂共聚，制得纳米TiO₂复合荧光增白剂（FBs-TiO₂），并将其用于纸张表面涂布。结果表明，FBs-TiO₂成功制备，且稳定性更好；FBs-TiO₂涂布后，纸张白度由67.2%提高到87.2%，抗张强度由3.12 kN/m提高到4.87 kN/m，撕裂指数由13.8 mN·m²/g提高到17.4 mN·m²/g，并且紫外光老化48 h后，返黄值由10.40下降到6.66。说明FBs-TiO₂不但能提高纸张白度、抑制纸张返黄，还能有效增强纸张的表面强度和力学性能，是一种性能优异的造纸助剂。

Abstract:A triazine amino stilbene fluorescent whitening monomer （FBs） was prepared by using 4，4-diamino-2，2-disulfonic acid stilbene （DSD acid） as the parent and cyanuric trichloride as the bridging agent. FBs， acrylamide， styrene and modified nano TiO₂ were copolymerized to obtain nano TiO₂ composite fluorescent whitening emulsion （FBs-TiO₂）， which was used for paper surface coating. The results showed that FBs-TiO₂ was successfully prepared and had better stability. The whiteness increased from 67.2% to 87.2%， the tensile strength was enhanced from 3.12 kN/m to 4.87 kN/m， the tearing strength was increased from 13.8 mN·m²/g to 17.4 mN·m²/g after FBs-TiO₂ was coated on paper surface， the PC value decreased from 10.40 to 6.66 after 48 hours of UV aging. It was indicated that the FBs-TiO₂ not only improved the whiteness of paper and inhibit the yellowing of paper， but also significantly enhanced the surface strength and mechanical properties of paper. It was a papermaking additive with positive performance.