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酚醛树脂是优良的胶粘剂材料，但存在易排放有毒物质、原料不可再生等缺陷。为了有效改善上述情况，提出一种采用木质素改性酚醛树脂的方法。在碱性条件下对木质素进行改性，然后用改性后的木质素与苯酚的邻、对位发生取代反应合成木质素基酚醛树脂。通过傅里叶变换红外光谱仪、紫外分光光度计等仪器表征，探究了不同木质素取代率制备的酚醛树脂的特征，系统测试了改性后胶粘剂的固体含量和胶合强度。通过单因子实验得到最佳实验条件为醛酚质量比1.5∶1、木质素取代率30%、碱质量分数15%，该条件下制备得到的胶粘剂固体含量为52.33%，胶合强度达到2.21 MPa。分别用红麻木质素改性酚醛树脂、工业木质素改性酚醛树脂和未改性酚醛树脂胶粘剂黏合人造板，测试不同板材的胶合强度。结果表明：工业木质素改性酚醛树脂的胶合强度为未改性酚醛树脂的56%，红麻木质素改性酚醛树脂的胶合强度为未改性酚醛树脂的79%，表明所制备得到的红麻木质素基酚醛树脂优于工业木质素基酚醛树脂。
Abstract：Phenolic resin is an excellent adhesive material, but it has drawbacks such as the emission of toxic substances and the use of non-renewable raw materials. To effectively address these issues, a method of modifying phenolic resin with lignin is proposed. Lignin is modified under alkaline conditions, and then lignin-based phenolic resin is synthesized by the ortho-para substitution reaction of the modified lignin with phenol. The characteristics of phenolic resins prepared with different lignin substitution rates are investigated using Fourier transform infrared spectroscopy(FTIR) and ultraviolet spectrophotometry(UV), and the solid content and bonding strength of the modified adhesives are systematically tested. Through single-factor experiments, the optimal experimental conditions are determined to be an aldehyde-phenol mass ratio of 1.5∶1, a lignin substitution rate of 30%, and an alkali dosage of 15%. Under these conditions, the solid content of the prepared adhesive is 52.33%, and the bonding strength reaches 2.21 MPa. Woodbased panels are bonded using kenaf lignin-modified phenolic resin, industrial lignin-modified phenolic resin, and unmodified phenolic resin adhesives, and the bonding strength of different panels is tested. The results show that the bonding strength of industrial lignin-modified phenolic resin is 56% of that of unmodified phenolic resin, while the bonding strength of kenaf lignin-modified phenolic resin is 79% of that of unmodified phenolic resin, indicating that the prepared kenaf lignin-based phenolic resin is superior to industrial lignin-based phenolic resin.
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基本信息:
DOI：10.12194/j.ntu.20240201001
中图分类号:TQ433.431
引用信息:
[1]王世星,吕万万,赵润格等.木质素改性酚醛树脂胶粘剂的制备及应用[J].南通大学学报(自然科学版),2024,23(02):82-88.DOI:10.12194/j.ntu.20240201001.
基金信息:
生物多糖纤维成形与生态纺织国家重点实验室自主课题（RZ2200002465）