超声活化酶解木质素用于酚醛树脂的制备

Preparation of Phenol-Formaldehyde Resin Using Enzymatic Hydrolysis Lignin Activated with ultrasonic wave

植物纤维原料酶水解制燃料乙醇后的剩余残渣中含有大量酶解木质素,木质素作为天然酚类物质可以替代来自化石资源的苯酚用于酚醛树脂的合成。本研究首先从燃料乙醇生产残渣中提取酶解木质素,然后将酶解木质素通过超声波进行活化改性,通过Folin-Ciocalteu法测定活化效果。以超声活化的酶解木质素为原料,以高替代率替代苯酚合成酚醛树脂,测定了产物的胶合强度等性能,并以FT-IR、DSC对木质素基酚醛树脂进行表征。结果表明:超声波活化法有利于酶解木质素反应活性的提高,酚羟基含量可提高38.60%。经活化改性的酶解木质素替代比为60%时LPF的胶合强度性能仍可达到国家标准。

Lignocellulosic materials can be used for producing bioethanol leaving a lai^e number of enzymatic hydrolysis lignin （EHL）in the remaining residue. As a natural phenolic compound, lignin can be used to partially replace petrochemical phenol to pre-pare phenol - formaldehyde resin. In the work, EHL was extracted from the residue of bioethanol production and activated with ultra-sonic wave. Free phenolic group content was determined with FoLin - Ciocalteu method to evaluate the effect of ultrasonic activation. The ultrasonic activated EHL was used to replace phenol and synthesize lignin - phenol - formaldehyde （ LPF） resin. The resin was characterized with Fourier Transform Infrared Spectroscopy （FT -IR）and Differential Scanning Calorimetry （ DSC） , its properties were determined. The ultrasonic activation significantly improved the reaction activity of EHL and its phenolic group content was improved 38. 60%. Even 60% phenol was replaced with the EHL, the bonding strength of LPF meet the national standard.