A kind of modified soybean protein-based adhesive and preparation method thereof

Abstract

The invention discloses a modified soybean protein-based adhesive and a preparation method thereof. Prepared from 1-8 parts of sodium formate, the preparation steps include dispersing defatted soybean protein powder and urea in a dispersion medium, adding a cross-linking enhancer and sodium benzoate, and stirring evenly to obtain it; the advantages of the present invention are: simple production process and convenient operation , the adhesive produced does not contain formaldehyde, and the main raw materials are derived from renewable substances.

Description

technical field [0001] The invention relates to an adhesive, in particular to a modified soybean protein-based adhesive used for preparing plywood and a preparation method thereof, belonging to the field of adhesives. Background technique [0002] With the improvement of people's living standards and the continuous and stable development of construction, decoration, packaging and other industries, the output of wood-based panels in my country has grown rapidly. In 2013, the total output of wood-based panels in my country was 272 million m 3 , accounting for about 50% of the world's total production. Among them, the particle board is 13.58 million m 3 , a year-on-year increase of 5.3%; fiberboard 59.83 million m 3 , a year-on-year increase of 4.0%; plywood 157 million m 3 , an increase of 10.5% year-on-year. The total output of wood-based panels, plywood, furniture, and wood flooring has ranked first in the world for many years in a row. [0003] The adhesives commonly ...

AI Technical Summary

Problems solved by technology

For example: 1) Although the use of low molar ratio modified urea-formaldehyde resin adhesives can effectively reduce the formaldehyde emission of wood-based panel products, the bonding strength of the products is often reduced, which cannot meet the requirements of use; and it can lead to prolonged curing time and reduced production efficiency; 2) Adding formaldehyde scavenger to urea-formaldehyde resin adhesives for wood-based panels can effectively reduce the release of free formaldehyde from wood-based panels, but it often reduces the bonding strength of wood-based panels at the same time; at the same time, the price of general formaldehyde scavenger is often much higher than that of urea-formaldehyde resin adhesives. Adding improves product cost and reduces product competitiveness; 3) Carry out post-processing to wood-based panels, as the invention patent application with publication number CN1526528 discloses a method for preparing E1 / EO grade environment-friendly wood-based panels using ammonia vacuum method. Manufacturing process; the utility model patent with publication number CN2394770 discloses a treatment device for reducing formaldehyde emission from wood-based panels. These post-processing methods not only make the manufacturing process of wood-based panels complicated, but also require huge investment in post-processing equipment and significantly increase production costs. ; 4) The use of other environmentally friendly adhesives, such as isocyanate adhesives, has led to a substantial increase in the production cost of wood-based panels and increased difficulty in the production process, which is difficult for enterprises and users to accept; Unglue

In summary, although the above measures can effectively reduce the release of free formaldehyde from wood-based panels, they cannot completely solve the problem of formaldehyde release, or cannot be popularized due to reasons such as high production costs.

[0005] In addition, the currently widely used wood-based panel adhesives also have the problem of dependence on fossil resources of raw materials, which do not meet the requirements of sustainable development

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