Aldehyde-free soybean modified wood bonding agent and method for preparing same

Abstract

The invention provides an aldehyde-free soybean modified wood bonding agent and a method for preparing the same. The aldehyde-free soybean modified wood bonding agent belongs to the protein-based bonding agent. The bonding agent is characterized in that: the soybean meal undergoes the three-step modification treatment which comprises the modification treatment by using mixed solution of alkali and ethanol in the early stage, the cross-linking modification by using a compound cross-linking agent in the intermediate stage and cutting by using an inorganic acid thinning agent to reduce viscosityin the final stage to prepare the bonding agent, wherein the compound cross-linking agent is the mixture of polyphosphate, sodium dodecyl sulfate and catechol containing a defoaming agent in propertyquantity; and the cutting thinning agent is the water-soluble inorganic acid. The invention provides an aldehyde-free soybean modified wood bonding agent having the advantages of low cost of raw materials, high bonding strength, high water resistance, easy coating and unnecessary high-temperature hot pressing and a method for preparing the same. The bonding agent provided by the invention solves the problems of low bonding strength and poor water resistance existing in the commercially available aldehyde-free soybean protein bonding agent, is environment-friendly and resource-saving, also solves the problems of high viscosity and poor coating process existing in the soybean protein bonding agent and is applied to the bonding of various wood products.

Description

technical field [0001] The invention relates to a non-formaldehyde soybean modified wood adhesive and a preparation method thereof. Belongs to protein-based adhesives. In particular it relates to viscosity reducers for the wood industry. Background technique [0002] Soybean adhesives have developed rapidly due to their ability to replace fossil resources, rich sources of raw materials, low prices, and safety and environmental protection. However, it is used in the plywood manufacturing industry, and its bonding strength and water resistance are lower than traditional urea-formaldehyde resin wood adhesives. [0003] Therefore, in the preparation of soybean-based wood adhesives, chemical modification, physical modification and enzyme modification are used to optimize and improve its performance. Among them, chemical modification is the most effective, including acid-base modification, urea modification, etc. Modification, acylation modification, surfactant modification, cr...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, soy protein isolates are generally used as raw materials for the preparation of soybean adhesives, and the production cost is relatively high; some people even use aldehyde crosslinking agents or mix them with urea-formaldehyde resins and phenolic resins to improve their bonding strength and bonding water resistance, resulting in Formaldehyde hazards still exist in soybean-based wood adhesives; commercially available formaldehyde-free soybean protein adhesives have the disadvantages of low bonding strength and poor water resistance, and users have to use high-temperature hot-pressing processes, resulting in waste of heat energy; in addition, soybean protein adhesives also have high viscosity. , Poor gluing process and other shortcomings, need to be improved

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