Hot melt type phenolic resin modified by using enzymatic hydrolysis lignin or derivatives thereof, and preparation thereof

Abstract

The invention provides enzymatic lignin or a derivative for the enzymatic lignin, namely modified hot-melt phenol-formaldehyde resin and a preparation method thereof, wherein the enzymatic lignin or the derivative for the enzymatic lignin, phenols, aldehydes and catalysts are taken as raw materials. The preparation method comprises the following steps: the enzymatic lignin or the derivative for the enzymatic lignin is mixed with the phenols according to the proportion; the mixture is heated and dissolved, added with the aldehydes and the catalysts, and subjected to heating and refluxing for a period of time; and residual water in the system is distilled, and the enzymatic lignin or the derivative for the enzymatic lignin, namely the modified hot-melt phenol-formaldehyde resin is obtained. The preparation method fully utilizes reproducible biological resources, overcomes the defects caused by extracting lignosulphonate from paper-making 'black liquor' in the prior art, can replace partial raw materials of the petrochemical industry, reduce the cost of preparing the phenol-formaldehyde resin by adopting phenyl hydroxide, select proper types of enzymatic lignin additives according to the modification requirements of different types of hot-melt phenol-formaldehyde resin, and improve the performance of the enzymatic lignin or the derivative for the enzymatic lignin, namely the modified hot-melt phenol-formaldehyde resin, has simple technology, is easy to implement, reduces the production cost, and improves the competitive power of products.

Description

technical field

[0001] The invention belongs to the field of polymer thermoplastic material preparation, and more specifically relates to an enzymatically hydrolyzed lignin or its derivative modified hot-melt phenolic resin and a preparation method thereof. Background technique

[0002] Phenolic resin is a commonly used polymer material, it has low cost, bulk density , good flame retardancy, good processability and other characteristics, it has been widely used in many industries. However, phenolic resin is synthesized from phenol and formaldehyde as the main raw materials. Phenol is a product of petrochemical or coal chemical industry. With the shortage of these mineral resources, the cost of raw materials is increasing day by day, and the traditional phenolic resin production faces difficulties in sustainable development.

[0003] There have been reports on the modification of lignin extracted from papermaking black liquor to prepare phenolic resins. However, the structu...