木质素的碱催化水热降解及其在酚醛树脂胶黏剂中的应用

打开文本图片集

关键词：木质素；水热降解；酚醛树脂；胶黏剂中图分类号：TS79 文献标识码：A DOI：10.11980/j.issn.0254-508X.2025.09.001

Alkali-catalyzed Hydrothermal Degradationof Ligninand Its Application to Phenolic Resin Adhesives

WANG Ning ZHOU Xuesong* （ColegeofLightIdustryScienceadEngineeing，outhChnaUniversityfTechnolog，GuangzhouGuangdongProvince064） （*E-mail：xszhou@scut. edu.cn）

Abstract：Acetatelignin（AAL）wasdegradedbyhdrotheraltreatmentwiththeaimofincreasingitsreactivefunctionalgroupcontent whileregulatingitselativemolecularweight，andreplacingpartofpenolwiththelow-molecular-weightacetatelignin（DAAL）obtaed throughhydrothealdegadatiotopreprelign-basedphnolic（D）resinhesive.Tefectsofhdroteralreatmentcoditios， suchareactiontemperature，eactiontime，andalkalidosage，onthemolecularweight，phenolichydroxylandmethoxylontentofacetate ligninwereivesigatedTefetsofignrothealdgaationoeicaladcalpropetisoflg-sedolic inadhesives，suchaswoodchipondingstrengt，theraltabity，andfreformaldehydecontentwereanalyzd.Teresultssoedtat when the hydrothermal degradation conditions were 20% alkali content （relative to the lignin mass fraction），reaction temperature of 200 ℃ andreactiontimeof15Omin，thephenolichydroxylcontentinDAALwashigherandthemethoxycontentwaslower，andthenumber-averagemolecularweightdecreasedfrom989to329；theperformanceofDLPFpreparedwithdegradedligninwasthebest，withawoodchip bonding strength of 1.35 MPa，and the free formaldehyde and free phenol contents were 0. 11% and 0 54% ，respectively.

Keywords：lignin；hydrothermal degradation；phenolic resin；adhesives

木质素具有独特的多酚结构和丰富的活性基团，其能在碱性条件下代替部分苯酚，与甲醛缩聚制备在工业领域中广泛使用的酚醛树脂胶黏剂]。（剩余11920字）