两亲性木质素磺酸盐提高脲醛树脂储存稳定性的意外作用及其作为胶粘剂的应用。

Unexpected role of amphiphilic lignosulfonate to improve the storage stability of urea formaldehyde resin and its application as adhesives.

机构信息

Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Laboratory for Biomass Chemical Utilization, Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, 210042, Jiangsu, China; College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, Jiangsu, China.

Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Laboratory for Biomass Chemical Utilization, Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Key Laboratory of Biomass Energy and Material, Nanjing, 210042, Jiangsu, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037, Jiangsu, China.

出版信息

Int J Biol Macromol. 2020 Oct 15;161:755-762. doi: 10.1016/j.ijbiomac.2020.06.135. Epub 2020 Jun 17.

DOI:10.1016/j.ijbiomac.2020.06.135

PMID:32561279

Abstract

As the second-largest natural polymer, the utilization of lignin for practical applications has attracted increasing attention. In this study, lignosulfonate was employed to enhance the storage stability of urea formaldehyde (UF) resins. Cryo-scanning electron microscopy was firstly used to observe the influence of lignosulfonate addition on the colloidal morphology of UF resin. Moreover, adding lignosulfonate at different stages during the UF resins synthesis was also investigated to reveal its effect on storage stability. The potential interaction between lignosulfonate and UF resins was then analyzed via FT-IR, C CPMAS NMR, and zeta potential. It has been observed that lignosulfonate could increase the electrostatic repulsion of UF resins to avoid aging. No chemical reaction between UF resins and lignosulfonate was observed. After the elucidation of potential interaction, the effect of lignosulfonate on the curing process, thermal stability and adhesive performance of UF resins was systematically evaluated. Finally, as adhesives to fabricate eucalyptus plywood, the shear strength and formaldehyde release of UF resins with 20% addition of lignosulfonate could reach 0.88 MPa and 0.12 mg/L, respectively. Due to the excellent performance, low cost and wide availability of lignosulfonate, it might be industrially used as a stabilizer in the UF resins production.

摘要

木质素磺酸盐作为第二大天然聚合物，其在实际应用中的利用引起了越来越多的关注。在本研究中，木质素磺酸盐被用于提高脲醛（UF）树脂的储存稳定性。首先采用冷冻扫描电子显微镜观察木质素磺酸盐添加对 UF 树脂胶体形态的影响。此外，还研究了在 UF 树脂合成的不同阶段添加木质素磺酸盐对储存稳定性的影响。然后通过 FT-IR、C CPMAS NMR 和 ζ 电位分析木质素磺酸盐和 UF 树脂之间的潜在相互作用。结果表明，木质素磺酸盐可以增加 UF 树脂的静电排斥，以避免老化。UF 树脂和木质素磺酸盐之间未观察到化学反应。阐明潜在相互作用后，系统评估了木质素磺酸盐对 UF 树脂固化过程、热稳定性和胶合性能的影响。最后，作为用于制造桉树胶合板的胶粘剂，添加 20%木质素磺酸盐的 UF 树脂的剪切强度和甲醛释放量分别可达 0.88 MPa 和 0.12 mg/L。由于木质素磺酸盐具有优异的性能、低成本和广泛的可用性，因此它可能在工业上用作 UF 树脂生产中的稳定剂。