Formaldehyde-free soybean meal based artificial board adhesive and preparation method thereof

Abstract

The invention discloses a formaldehyde-free soybean meal based artificial board adhesive and a preparation method thereof. The formaldehyde-free soybean meal based artificial board adhesive is prepared from 60-70 parts of a dispersion medium, 20-35 parts of defatted soybean protein powder, 0.1-0.8 part of sodium hydroxide, 5-10 parts of polyethylene glycol, 0.5-3 parts of sodium bisulfite, 0.1-2.0parts of a crosslinking enhancer, and 1-5 parts of sodium benzoate. The preparation method includes: adding the defatted soybean protein powder, the crosslinking enhancer, sodium hydroxide, sodium bisulfite and polyethylene glycol into the dispersion medium, stirring the substances evenly, then conducting heat preservation at 60-80DEG C for 3-6h; and then cooling the obtained mixture to 25-35DEGC, adding sodium benzoate, and stirring the substances evenly. The method provided by the invention has the advantages of simple process and convenient operation, the produced adhesive is free of formaldehyde, the main raw materials come from renewable materials, and are safety and environment-friendly.

Description

technical field [0001] The invention relates to a wood-based panel adhesive, specifically a non-acrylic soybean meal-based wood-based panel cross-adhesive and a preparation method thereof, belonging to the field of wood-based panel 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 m3, accounting for about 50% of the world's total output. Among them, particleboard was 13.58 million m3, a year-on-year increase of 5.3%; fiberboard was 59.83 million m3, a year-on-year increase of 4.0%; plywood was 157 million m3, a year-on-year increase of 10.5%. 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] Adhesives c...

AI Technical Summary

Problems solved by technology

For example: 1), although the use of a low molar ratio modified urea-formaldehyde resin adhesive can effectively reduce the release of the base of the wood-based panel product, but the product's bonding strength is often reduced, which cannot meet the requirements of use, and can lead to prolonged curing time and reduced production efficiency; 2 ) Adding formaldehyde trapping agent to the formaldehyde resin adhesive for wood-based panels can effectively reduce the release of free carboxylate 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 traps is often far away Higher than urea-formaldehyde resin adhesive, its addition has improved product cost, has reduced product competitiveness; 3), wood-based panel is carried out aftertreatment, discloses a kind of adopting ammonia vacuum method to make each The manufacturing process of E1 / E0 environment-friendly wood-based panels; the utility model patent with the publication number CN2394770 discloses a treatment device for reducing the release of wood-based panels. These post-processing methods not only make the wood-based panel manufacturing process complicated, but also Moreover, the investment in post-processing equipment is large, and the production cost is obviously improved; 4), the use of other environmentally friendly adhesives, such as isocyanate acrylic adhesives, causes a substantial increase in the production cost of wood-based panels and increases the difficulty of the production process. It is difficult for users to accept; the wood-based panels made of ordinary protein adhesives have low bonding strength, and the wood-based panels are easy to open.

[0005] In summary, although the above measures can effectively reduce the high formaldehyde emission of wood-based panels, they cannot completely solve the problem of formaldehyde emission, or cannot be popularized due to reasons such as high production costs.

[0006] 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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