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对秸秆发酵乙醇残渣进行磺甲基化改性,可有效提高残渣中改性木质素的反应活性;然后将磺甲基化改性发酵残渣用于脲醛树脂(UF)胶粘剂配方中,制备木材用改性UF胶粘剂。结果表明:当m(发酵残渣)∶m(甲醛)=10∶1、m(发酵残渣)∶m(亚硫酸钠)=5∶1和磺甲基化改性发酵残渣替代率为20%时,相应胶合板的各项性能都达到GB/T 14074—2006标准中的指标要求,其水煮3 h后的胶合强度≥0.7 MPa;该改性UF胶粘剂具有制备工艺简单、游离甲醛含量较低等优点,其应用前景良好。
Sulfomethylation of ethanol residues from straw fermentation can effectively improve the reactivity of the modified lignin in the residue. The sulfomethylated modified fermentation residue is then used in a urea formaldehyde resin (UF) adhesive formulation to prepare wood Modified UF adhesive. The results showed that when m (fermentation residue): m (formaldehyde) = 10:1, m (fermentation residue): m (sodium sulfite) = 5:1 and sulfomethylated modified fermentation residue replacement rate was 20% The properties of plywood meet the index requirements of GB / T 14074-2006 standard, and the bonding strength after boiling for 3 h is 0.7 MPa. The modified UF adhesive has the advantages of simple preparation process and lower free formaldehyde content, Its application prospects are good.