Tannic acid and boric acid modified bean powder adhesive and preparation method thereof

Abstract

A tannic acid and boric acid modified soybean flour adhesives and preparation method thereof relates to an adhesive and a preparation method thereof. The invention solves the problems in the prior art such as poor water resistance, high PH value and strongly corrosive acid. The compositions of the invention are made according to a weight proportion of 100 shares of soybean flour, 600 shares of water, 2 to 10 shares of tannic acid and 2 to 10 shares of boric acid. The preparation method comprises the steps that: the soybean flour is dissolved into the water at the temperature between 30 DEG C and 35 DEG C and then kept in a water bath at a temperature between 30 DEG C and 35 DEG C for 3 to 8 minutes; the soybean flour was mixed with the boric acid solution after the soybean flour is stirred for even mixture; at intervals of 10-20 minutes, the tannic acid solution is add and stirred until even mixture and subjects to a reaction for 10 to 20 minutes. Compared with the prior art, the PH value of the adhesive of the invention is low; thereby the stimulated corrosion towards the adhesive material and production workers is reduced and the bonding strength is improved. The soybean flour made by the invention is applicable to plywood production and other packaging materials. The invention has the advantages of releasing no formaldehyde, low corrosive acid, good water resistance, high bonding strength, and simple producing technique. The invention belongs to an environmental-friendly adhesive.

Description

technical field [0001] The invention relates to an adhesive and a preparation method thereof, in particular to a tannic acid and boric acid modified soybean flour adhesive and a preparation method thereof. Background technique [0002] Soybean flour adhesive is a formaldehyde-free and environmentally friendly adhesive processed from defatted soybean flour. It can effectively utilize soybean processing residues, increase product added value, and increase farmers' income. Compared with the existing "aldehyde" adhesives, the wood-based panels bonded with it have no formaldehyde release during production and use, which is beneficial to environmental protection and harmless to the human body. Soybean gum was widely used in the early 20th century, but gradually declined due to the appearance of synthetic resins. In recent years, the oil crisis has intensified, prompting people to re-use renewable resources rationally and reduce dependence on petroleum products. Therefore, the res...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of tannic acid and boric acid modified soybean powder adhesive and its preparation method in order to solve the problems of poor water resistance, high alkalinity and strong corrosion of existing soybean gum

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