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I. Technical Overview
Decorative adhesive film paper produced using melamine-formaldehyde (MF) glue and melamine-modified urea-formaldehyde (MUF) glue impregnation process not only releases free formaldehyde, but is also quite brittle. When used as a surface finish for plywood and blockboard, surface cracking and other phenomena are likely to occur.
This technology develops a low-viscosity, low-molecular-weight, small-particle-size thermosetting formaldehyde-free adhesive. This adhesive is used for the first stage of impregnation of decorative paper, while the second stage uses traditional MF adhesive. After conventional decorative paper impregnation, drying, and hot-pressing processes, a low-formaldehyde decorative adhesive film paper finish is achieved for engineered wood panels. The low-formaldehyde decorative adhesive film paper produced by this technology has a low free formaldehyde release and a certain degree of flexibility. Engineered wood panels finished with this decorative adhesive film paper exhibit physical strength properties close to those of MF adhesive film paper finished panels.
II. Technical Features
(1) This technology significantly reduces the use of traditional melamine glue and urea-formaldehyde glue, and to a certain extent solves the problem of free formaldehyde release from decorative paper on engineered wood panels, thus achieving low-formaldehyde content in decorative paper. The formaldehyde release of the low-formaldehyde decorative adhesive film paper prepared by this technology can reach the F**** standard.
(2) The surface bonding strength and abrasion resistance of the low-formaldehyde decorative paper-faced artificial board produced by this technology are close to those of the melamine-coated decorative paper-faced panel. At the same time, it gives the decorative paper a certain degree of flexibility, which solves the problem of surface cracking of current decorative plywood and blockboard.
(3) The process and equipment conditions for the impregnation, drying and hot pressing finishing of the adhesive are compatible with the existing production and application conditions of decorative adhesive film paper, and can be produced under existing equipment and process conditions.
III. Technical Specifications
The formaldehyde release of the low-formaldehyde decorative adhesive film paper prepared by this technology is less than 0.3 mg/L, the surface bonding strength exceeds 1 MPa, and the decorative plywood does not crack, blister, or discolor after cold and heat cycling. It also achieves a level 5 resistance to pollution corrosion, dry heat, cracking, and water vapor.
IV. Market Prospects
This technology effectively solves the problem of preparing low-formaldehyde decorative film paper. While retaining the strength properties of traditional decorative paper, low-formaldehyde decorative film paper also possesses a certain degree of flexibility, effectively addressing the cracking issues of veneered plywood and blockboard. Simultaneously, the processing performance of the decorative film paper is improved, enabling different-sided coating. Therefore, it can be widely used in the processing of wood products such as furniture, cabinets, doors, and windows, involving a large industrial output value and possessing a promising long-term market prospect.