碱处理对油茶籽蛋白降解及其胶黏剂性能的影响

为了促进油茶产业的发展以及开发新的蛋白胶黏剂，以油茶籽蛋白为原料（蛋白质含量36%，纤维含量15%），采用碱（NaOH）对其进行降解处理，并与交联剂混合作为胶黏剂应用于胶合板的热压中。考察了NaOH加量对油茶籽蛋白水解度和降解液甲醛反应能力、黏度和胶黏剂胶合性能的影响，并对降解前后油茶籽蛋白进行了红外表征。结果表明：NaOH可使油茶籽蛋白有效降解，并产生活性基团和活性点；随着NaOH加量的增加，油茶籽蛋白水解度和降解液甲醛反应能力呈先急剧增加后缓慢增加的趋势，降解液黏度呈先增加后急剧减小再缓慢减小的趋势；所制备的胶合板的湿状胶合强度总体呈先增加后减小的变化趋势。NaOH加量为7%时，油茶籽蛋白降解液具有较高的反应活性、较大的内聚强度、较好的施胶性能和优良的胶合性能。

Effects of NaOH treatment on degradation of Camellia oleifera seed protein and its adhesive properties

In order to promote the development of Camellia oleifera industry and develop a new protein based adhesive, Camellia oleifera seed protein (protein content 36%, fiber content 15%) was degraded by NaOH, and then mixed with cross-linking agent and applied to hot pressing of plywood as adhesive. The effects of the amount of NaOH on the hydrolysis degree of Camellia oleifera seed protein, the viscosity and reaction ability with formaldehyde of the degradation solution and the bonding performance of the adhesive were investigated. The Camellia oleifera seed protein before and after degradation was characterized by in frared spectroscopy. The results showed that NaOH could effectively degrade Camellia oleifera seed protein and produce active groups and active sites. With the increase of NaOH amount, the hydrolysis degree and the reaction ability with formaldehyde increased rapidly at first and then increased slowly, and the viscosity increased rapidly at first and then decreased sharply and then decreased slowly, and the wet bonding strength of Camellia oleifera seed protein-based adhesive increased first and then decreased. When the amount of NaOH was 7%, the degradation solution of Camellia oleifera seed protein had higher reactivity, higher cohesive strength, better operation property, and better bonding performance.