Production method of moisture-proof modified urea resin adhesive

Application number（歐洲專利號）:  CN20151143487

Abstract：The invention provides a moisture-proof modified urea resin adhesive. The moisture-proof modified urea resin adhesive is prepared from the following raw materials in parts by weight: 55-75 parts of modified urea resin, 4-8 parts of polyvinyl acetate emulsion, 0.4-0.9 part of vinyltrimethoxysilane and 25-35 parts of filler; the preparation method of the moisture-proof modified urea resin adhesive comprises the following steps: firstly, preparing the modified urea resin, adding formaldehyde at a time, adding urea at three times, and adding oxidized starch and furfuryl alcohol in the reaction process as modifiers, wherein the production of the modified urea resin is divided into three stages, namely a reaction initial stage, a reaction middle stage and a reaction later stage; adding the polyvinyl acetate emulsion and triethoxyisobutylsilane after polymerication at the later stage, stirring and mixing evenly and then adding the filler; due to the process, the gelation phenomenon in the polymerization process is avoided; the obtained urea resin is improved in water resistance and low in formaldehyde residue; if the urea resin is applied to producing an artificial board, the obtained artificial board can be applied to a high-humidity environment in the south, and is low in formaldehyde release amount.

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