Adhesive composition for veneer sheets and preparation technique thereof

Abstract

The invention relates to the technical field of adhesives, particularly an adhesive composition for veneer sheets and a preparation technique thereof. The adhesive composition is composed of the following substances in parts by mass: 120-150 parts of water, 25-35 parts of polyvinyl alcohol, 100-120 parts of 42% urea solution, 10-16 parts of bentonite, 10-20 parts of thickener, 10-15 parts of preservative, 0.3-0.6 part of moldproof bactericide, 3.5-6.8 parts of iodine weed, 20-30 parts of melamine urea-formaldehyde resin, 5-10 parts of foaming agent and 20-30 parts of filler. The pH value of the adhesive composition is 3-5. The adhesive composition for veneer sheets avoids using formaldehyde, benzene, toluene and other toxic substances, can satisfy the demands of people for green construction materials and high-grade furniture in home decoration, and is suitable for demands of people. The artificial sheet produced by using the product can completely implement no toxicity, no harm and environment friendliness. The adhesive composition has the advantages of no environmental pollution in the production process, short curing time and long effective service life.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to an adhesive composition for plywood and a preparation process thereof. Background technique [0002] At present, the adhesives used in plywood production are still mainly formaldehyde-based adhesives. Among them, phenolic resin adhesives are mostly used to produce outdoor type I plywood, and urea-formaldehyde resin adhesives are mostly used to produce indoor type II plywood. In the process of production and use, free formaldehyde will be released from the connected products, which will endanger people's health. As consumers' awareness of environmental protection is increasing, the production of formaldehyde-based adhesives, especially urea-formaldehyde resin adhesives for bonding indoor products, is under pressure. increasingly strict restrictions. The release of harmful formaldehyde gas can be reduced by improving the production process of urea-formaldehyde resin glue, or ado...

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Problems solved by technology

[0002] At present, the adhesives used in plywood production are still mainly formaldehyde-based adhesives, of which phenolic resin adhesives are mostly used to produce outdoor type I plywood, and urea-formaldehyde resin adhesives are mostly used to produce indoor type II plywood. In the process of production and use, free formaldehyde will be released from the connected products, which will endanger people's health. As consumers' awareness of environmental protection is increasing, the production of formaldehyde-based adhesives, especially urea-formaldehyde resin adhesives for bonding indoor products, is subject to increasingly strict restrictions

The release of harmful formaldehyde gas can be reduced by improving the production process of urea-formaldehyde resin glue, or adopting appropriate post-treatment methods for the bonded products, but this not only increases the cost, but also cannot completely solve the problem of free formaldehyde release

[0003] In the article "Development of Hot-pressed Starch-based Waterborne Isocyanate Wood Adhesive" published in the Journal of Northeast Forestry University 2008-7, it was introduced that "a wood adhesive with a large amount of annual cornstarch as the main raw material and high comprehensive performance ", but the preparation process of this adhesive is complicated, and the production cost cannot be greatly reduced

Patent No. 200410017054.5 introduces a wood adhesive with vegetable protein as the main raw material and its preparation method, but the wood adhesive prepared by this formula and method has poor water resistance, and there is a lack of product quality in industrial production. Stability, and the pressure of the hot-pressed thermometer required for plate production is high, and the quality of the produced plate is difficult to guarantee

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