Viscosity-adjustable thermosetting artificial board starch adhesive and preparation method thereof

Abstract

The invention discloses a viscosity-adjustable thermosetting artificial board starch adhesive and a preparation method thereof, and belongs to the technical field of adhesive preparation. In the mehtod, starch, as a main raw material, is subjected to acidolysis; then the viscosity of the adhesive is reasonably controlled by precisely controlling the pre-gelatinization temperature, the pre-gelatinization duration and the dripping speed of the cross-linking monomer and dropwise adding the cross-linking monomer and the initiator in sections; the control requirement of industrial production on thereaction precision is reduced, and the method can be widely applied to application fields with different requirements on the viscosity of the adhesive. The adhesive product prepared by the inventiondoes not release formaldehyde and has the advantage of environmental protection. Meanwhile, the adhesive disclosed by the invention is good in water resistance and strong in cohesion, various properties of the manufactured artificial board exceed the standard of class II artificial boards, and the adhesive is suitable for mass production and is widely applied to adhesion of hot-pressed wood decorations, artificial boards and plywood.

Description

technical field [0001] The invention relates to a thermosetting artificial board starch adhesive with adjustable viscosity and a preparation method thereof, belonging to the technical field of adhesive preparation. Background technique [0002] With the rapid development of the home improvement industry, the demand for wood panels is also increasing year by year. But at the same time, my country's per capita forest area is small, and it is still decreasing year by year. Therefore, the use of wood-based panels to replace wood has become the best choice to solve this problem. At present, most wood-based panels on the market are produced by hot-pressing technology, using "trialdehyde" series adhesives with thermosetting properties, but the above-mentioned adhesives have poor water resistance, raw materials are not renewable, and the release of harmful gases such as formaldehyde has adverse effects on the environment. [0003] Starch is a biomacromolecule with an extremely rich...

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Problems solved by technology

However, traditional starch-based adhesives still have many problems, such as poor water resistance. In addition, the proportion of starch in the total solid content of most starch-based adhesives is less than 50%, which greatly relies on non-renewable resources and is relatively expensive. High, poor environmental protection; our research and development team has successfully prepared a starch-based adhesive with a high starch content of 75% starch solid content, but at the same time, when the solid content of starch in the starch-based adhesive is too high, it will lead to adhesive failure. The viscosity is too high, it is difficult to apply to some relatively narrow places, and there are problems such as uneven reaction, unstable reaction system, etc.

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