硅藻土对单宁酸/淀粉/聚乙烯醇木材用复合胶黏剂的性能影响
Effect of Diatomite on Properties of Tannic Acid/Starch/Polyvinyl Alcohol Composite Adhesives for Wood
金志翔 1夏英 1陈浩哲 1刘雪婷 1于洪健 1王事捷1
作者信息
- 1. 大连工业大学纺织与材料工程学院,辽宁大连 116034
- 折叠
摘要
制备了硅藻土(Diatomite)增强单宁酸(Tannic acid)/淀粉(Starch)/聚乙烯醇(PVA)胶黏剂(DTSP),探究了硅藻土添加量对DTSP胶黏剂性能的影响.采用傅里叶变换红外光谱(FT-IR)对DTSP胶黏剂的化学结构进行了表征.结果表明,硅藻土通过硅羟基与淀粉基胶黏剂中的羟基形成氢键从而发生交联.采用扫描电子显微镜(SEM)对固化后胶层的断面进行分析,可以观察到添加了硅藻土的DTSP胶黏剂与未添加硅藻土的TSP胶黏剂相比较为粗糙,这表明DTSP胶黏剂形成了稳定而坚韧的交联网络.通过对胶黏剂的固化性能和黏结性能测试,当硅藻土的添加量为3%时,DTSP胶黏剂的综合性能最优,其木材-木材拉伸剪切强度为3.16 MPa,经过24h去离子水浸泡后的拉伸剪切强度为1.37 MPa.与TSP胶黏剂相比,固化时间缩短了20 min,固含量由26.15%提升至36.25%.吸湿率和饱和吸湿率都有下降,接触角也由 70.2°提升至 85.7°.
Abstract
Diatomite enhanced tannic acid/starch/polyvinyl alcohol(PVA)adhesives(DTSP)were prepared,and the effect of diatomite addition on the performance of DTSP adhesives was investigated.The chemical structure of the DTSP adhesive was characterized by Fourier transform infrared spectroscopy(FT-IR).The results showed that diatomite crosslinks by forming hydrogen bonds with hydroxyl groups in starch-based adhesives through silica hydroxyl groups.The cross-section of the cured adhesive layer was analyzed by scanning electron microscopy(SEM),and it was observed that the DTSP adhesive had a rougher surface than the TSP adhesive without added diatomite,indicating the DTSP adhesive layer formed the stable and toughness cross-linking network.By testing the curing and bonding properties of the adhesives,when the diatomite was added at a level of 3%,the DTSP adhesive had the best overall performance,with a wood-wood tensile shear strength of 3.16 MPa,and a tensile shear strength of 1.37 MPa after soaking in water for 24 hours,the curing time was shortened by 20 minutes and the solid content was increased from 26.15%to 36.25%,compared with the TSP adhesive.The moisture absorption rate and saturated moisture absorption rate were decreased,and the contact angle was also improved from 70.2° to 85.7°.
关键词
硅藻土/淀粉/胶黏剂/交联Key words
diatomite/starch/adhesive/cross-linking引用本文复制引用
基金项目
辽宁省教育厅项目(A类)(LJKZ0513)
辽宁省振兴人才计划(XLYC1906017)
出版年
2024
NETL
NSTL
万方数据