Application of sodium carboxymethyl cellulose or carboxymethyl cellulose or carboxymethyl starch in improving the water resistance of wood adhesives

Abstract

The invention discloses a novel waterproof wood material adhesive and a preparation method thereof. Sodium carboxymethylcellulose or carboxymethylcellulose or carboxymethyl starch accounting for 0.3-0.8% is added to the adhesive. The adhesive is urea resin adhesive, waterborne polyurethane adhesive, acrylic ester adhesive, epoxy resin adhesive, isocyanate adhesive, phenolic resin adhesive, soy-based adhesive, starch adhesive, lignin adhesive, tannin adhesive and the like. Liquid sodium carboxymethylcellulose and carboxymethylcellulose can be directly added to the adhesive; powdery sodium carboxymethylcellulose, carboxymethylcellulose and carboxymethyl starch are added together with the last batch of solid raw materials in the production process. The waterproof wood material adhesive is high in bonding strength, good in waterproofing performance and low in cost; when the adhesive is used for manufacturing fiberboards or plywood, the water absorption expansion coefficient of panels is kept between 0.5 mm and 0.8 mm, the waterproofing performance is improved, the bonding strength is improved, and the adhesive is particularly suitable for manufacturing fiberboards.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and relates to the application of sodium carboxymethyl cellulose, carboxymethyl cellulose or carboxymethyl starch in improving the water resistance of wood adhesives. Background technique [0002] Urea-formaldehyde resin adhesive is the most used type of adhesive, especially in the manufacture of various wood-based panels in the wood processing industry, urea-formaldehyde resin and its modified products account for about 90% of the total amount of adhesive. However, it is easy to decompose when encountering strong acid and strong alkali, poor weather resistance, poor initial viscosity, large shrinkage, high brittleness, water resistance, and easy aging. The wood-based panels produced by urea-formaldehyde resin have the problem of formaldehyde release in the process of manufacture and use. , so it must be modified. In other words, although the early urea-formaldehyde resin adhesive products wer...

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Problems solved by technology

The products made by the above method either have poor bonding strength, poor water resistance, or high cost