Method for preparing starch glue for lumber

Abstract

The present invention relates to a preparation method of starch glue for wood. Said invention uses starch as main raw material, and adopts the following steps: firstly, making starch undergo the processes of acidolysis, oxidation and graft copolymerization, etc., then adding modifying agent and complexing agent to make cross-linking modification, then heating and gelatinizing, cooling and successively adding the adjuvants of diluent, plasticizer and defoaming agent so as to obtain a starch glue with excellent performance for wood.

Description

technical field [0001] A preparation method of starch glue for wood belongs to the technical field of adhesive preparation methods. Background technique [0002] According to the different production materials and production methods of adhesives, wood adhesives can be divided into two categories: natural polymer glue and synthetic polymer glue. Natural polymer adhesives mainly include protein glue and starch glue. The history of using natural adhesives in my country is quite long. Since this kind of adhesive is made of natural materials, most of which are water-soluble. Generally speaking, the bonding strength, water resistance, heat resistance, chemical resistance and other properties are not high. Adhesive products cannot withstand harsh conditions and have a short service life. Therefore, the amount of natural polymer glue used in wood industry adhesives is becoming less and less. At present, synthetic polymer adhesives are mainly used. Among them, the most widely used a...

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Problems solved by technology

Starch has been used as an adhesive after gelatinization or oxidation modification for a long time, but its application range is greatly limited due to its poor moisture resistance, low initial adhesion, and slow drying speed, especially in wood adhesives. In the industry, few researchers use starch as the main raw material to develop wood adhesives. Most of the research is only adding a small amount of starch to wood adhesives such as white latex and urea-formaldehyde resins. The results are not significant for improving the performance of wood adhesives; there are also a small number of studies Those who directly compound starch or modified starch with polymers such as polyvinyl acetate emulsion, VAE emulsion, etc. in a certain proportion and add additives to make wood adhesives, although this method uses more starch than the previous method. There is a large increase, but because the compounding fails to change the starch properties too much, the water resistance and stability of the adhesive are still poor, and a large amount of additives such as formaldehyde must be added for improvement, which not only complicates the process, but also Increase costs, generate pollution