大豆蛋白改性酚醛树脂制备及其固化特性研究

采用富含氨基的大豆蛋白对酚醛树脂进行共缩聚改性，探索蛋白对酚醛树脂低温快速固化的影响。通过检测树脂的pH、固含量、凝胶时间，以及结合红外、热重、差示扫描量热分析等方法对改性的酚醛树脂的各项性能进行研究。结果表明，大豆蛋白改性酚醛树脂具有良好的理化特性和胶接性能，其中30%SPF树脂制备胶合板的胶合强度高，达到1.30 MPa;大豆蛋白与苯酚、甲醛发生了共缩聚反应，形成的大豆蛋白-苯酚-甲醛共缩聚树脂结构具有优异的热稳定性，且具有较低的固化温度。该研究解决了酚醛树脂存在的固化温度高、固化速率慢、高度依赖化石资源等缺点，为其在木材工业中广泛应用提供依据。

Preparation and Curing Properties of Soybean Protein Modified Phenolic Resin

Phenolic resin is one of the most widely used wood adhesives in the wood-based panel industry.It has the features of high bonding strength,excellent water resistance,and good weather resistance.However,drawbacks of phenolic resins such as high curing temperature,low curing rate,and high dependence on petrochemical resources,which severely limit its wide applications in the wood industry.In order to solve the above-mentioned shortcomings,this study modified phenolic resin using soybean protein via co-condensation,and explored the effect of plant protein on the fast curing of phenolic resin at low temperature.Various properties of soybean protein modified phenolic resin were studied by detecting the resin’s pH,solid content,gel time,as well as Fourier transform infrared analysis (FTIR),thermogravimetric analysis (TG),differential scanning calorimetry analysis (DSC),and other measurements.The results showed that the soybean protein modified phenolic resin had good physical/chemical properties and high bonding strength.Among the adhesives tested,the plywood prepared with 30% SPF resin had the highest bonding strength,reaching up to 1.30 MPa.Polycondensation reactions occurred between the soybean protein,phenol,and formaldehyde,leading to the formation of soybean protein-phenol-formaldehyde resin with co-polycondensation structures that had excellent thermal stability and lower curing temperature.