Environment-friendly high-strength water-resisting and mildew-resisting adhesive for plywood and preparation method of environment-friendly high-strength water-resisting and mildew-resisting adhesive

Abstract

The invention discloses an environment-friendly high-strength water-resisting and mildew-resisting adhesive for a plywood and a preparation method of the environment-friendly high-strength water-resisting and mildew-resisting adhesive. The environment-friendly high-strength water-resisting and mildew-resisting adhesive is prepared from the following raw materials including polyvinyl alcohol, cassava starch, dibutyl phthalate, sodium pyrosulfite, tannic acid, jade powder, calcium silicate hydrate, asbestos powder, p-hydroxybenzoic acid hydrazide, diammonium hydrogen phosphate, hydroquinone, sodium diethylhexyl sulfosuccinate, triethyltin chloride, phenyl mercury oleate, borax and the like. The polyvinyl alcohol and the cassava starch are subjected to a cross-linking reaction so that crystallization degrees of the polyvinyl alcohol and the cassava starch are reduced and a new cross-linking structure is formed, and furthermore, the thermal stability of the adhesive is improved; the borax is added and the polyvinyl alcohol and the starch can be subjected to further cross linking, so that the cross-linking degree and the initial viscosity of the adhesive are improved, and furthermore, the water resistance and the bonding force of the adhesive can be improved; the triethyltin chloride, the phenyl mercury oleate, the p-hydroxybenzoic acid hydrazide and the like are added so that the mildew-resisting capability of the plywood can be improved.

Description

technical field [0001] The invention relates to an adhesive, in particular to an environment-friendly high-strength water-resistant and mildew-resistant adhesive for plywood and a preparation method thereof. Background technique [0002] With the continuous development of the wood industry and the expansion of the application range of wood-based panels, more and more solid wood products are replaced by wood-based panels, and its products are also widely accepted by consumers. Wood-based panels can be roughly divided into plywood, particle board, fiberboard, blockboard, etc. The products are mainly used in furniture manufacturing, construction, transportation, packaging materials, and civil equipment industries. The output of plywood in our country is huge, which occupies an important position in the wood-based panel products. Plywood requires the use of adhesives to bond and press wood chips during the manufacturing process [0003] Polyvinyl alcohol is a water-soluble pol...

AI Technical Summary

Problems solved by technology

However, the characteristics of polyhydric water-soluble polymers make polyvinyl alcohol wood adhesives have poor water resistance. If they are in a humid environment, mildew will occur, which will affect their service life.

Moreover, people often add formaldehyde, butyraldehyde or crotonaldehyde to acetalize polyvinyl alcohol, or add toluene diisocyanate and triphenylmethane triisocyanate to cross-link polyvinyl alcohol to improve the polyvinyl alcohol adhesive. The water resistance and bonding performance of the product have achieved relatively obvious modification effects, but due to the irritating odor and toxicity of aldehydes and isocyanates, it will cause indoor air pollution and affect people's health