Adhesive for wood-based panels and its preparation method and application

Abstract

The invention relates to an adhesive for artificial boards, and a preparation method and application thereof. The adhesive for artificial boards is prepared from a dispersion medium, a protein substance, an alkaline compound and a crosslinking reinforcer, wherein the crosslinking reinforcer is a tannin-glyoxal resin. The adhesive for artificial boards is free of formaldehyde, is mainly prepared from renewable substances, and thus, is an environment-friendly adhesive for artificial boards; the adhesive provided by the invention thoroughly solves the problem of formaldehyde pollution when in use, and ensures water resistance, adhesion strength and other practical properties of the adhesive; compared with the prior art, the components have favorable synergetic effects, so that the effect is enhanced; the preparation method is simple, does not need very long curing time, is convenient to operate and has high production efficiency; and generally, the method comprehensively utilizes the resources, saves the production cost, conforms to the principles of environmental protection and sustainable development, and has favorable application prospects.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to an adhesive for wood-based panels, its preparation method and application. Background technique [0002] With the rapid development of construction, decoration, packaging and other industries, the output of wood-based panels in my country has increased rapidly. In 2012, the total output of wood-based panels in my country was 286 million square meters, accounting for about 50% of the world's total output. Among them, particleboard was 12.89 million square meters, a year-on-year increase of 7.2%; fiberboard was 55.54 million square meters, a year-on-year increase of 13.1%; plywood was 142 million square meters, a year-on-year increase of 18.3%. The total output of wood-based panels, plywood, furniture and wood flooring has ranked first in the world for many years. [0003] The adhesives commonly used in the production of wood-based panels are formaldehyde-based synthetic resins,...

AI Technical Summary

Problems solved by technology

However, these technologies have many disadvantages

For example: 1) Although the use of a low molar ratio modified urea-formaldehyde resin adhesive can effectively reduce the formaldehyde emission of wood-based panel products, the bonding strength of the product is often reduced, which cannot meet the requirements of use; and the curing time is prolonged and the production efficiency is reduced; 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 also reduces the bonding strength of wood-based panels; at the same time, the price of general formaldehyde scavenger is often much higher than that of urea-formaldehyde resin adhesives. , its addition increases product cost and reduces product competitiveness; 3) Carry out post-processing to wood-based panels, such as the invention patent application with publication number CN1526528 (public date: September 8, 2004) discloses a method using The manufacturing process of E1 / EO grade environment-friendly wood-based panels prepared by ammonia vacuum method; the utility model patent with publication number CN2394770 (public date: September 6, 2000) 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; The production process is more difficult, which is difficult for both enterprises and users to accept; moreover, there may still be problems in the disposal of its glued products (for example, poisonous gas hydrogen cyanide may be produced during incineration); Low bonding strength of boards, wood-based boards are easy to open glue

In summary, although the above technical means 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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