Fabrication and Characterization of EVA Resins as Adhesives in Plywood

Abstract

The practical problem of free formaldehyde pollution in the plywood industry is that polyethylene films have been shown to be able to replace some urea–formaldehyde resins for wood adhesives. To broaden the variety of thermoplastic plywood, reduce the hot-press temperature, and save energy consumption, an ethylene–vinyl acetate (EVA) film was selected as a wood adhesive to manufacture a novel wood–plastic composite plywood via hot-press and secondary press processes. The effects of the hot-press and secondary press processes at different levels on the physical–mechanical properties of EVA plywood (tensile shear strength, 24 h water absorption, and immersion peel performance) were evaluated. The results showed that the properties of the resulting plywood using the EVA film as an adhesive could meet the type III plywood standard. The optimum hot-press time was 1 min/mm, the hot-press temperature was 110–120 °C, the hot-press pressure was 1 MPa, the dosage film was 163 g/m2, the secondary press time was 5 min, the secondary press pressure was 0.5 MPa, and the secondary press temperature was 25 °C. EVA plywood can be used in indoor environments.

Improving the Shear and Tack Strengths of Chlorinated Poly(propylene carbonate) through Chain Extension with Polylactic Acid for Biodegradable Hot Melt Adhesives

“…The contact pressure between the two substrates was provided by two butterfly clips (size: 32 mm) with a pressure of approximately 1.2 MPa. The results were averaged among five groups of samples …”

Modified pine needles as a formaldehyde scavenger for urea-formaldehyde resin in plywood production

“…Plywood is a valuable wood-based material characterized by a layered structure, widely used in construction, furniture manufacturing, internal design, as packing material etc. (Zhang et al 2023). The wide range of its applications results from many bene cial properties, among others, great durability, tensile strength and resistance to deformation.…”

Combustion behavior, mechanical performance and application for vinyl acetate–ethylene copolymer emulsion containing melamine amino trimethyl phosphate and sodium lignosulfonate

“…The consumption of VAE polymer emulsion is around 500,000 ~ 600,000 tons per year in China, and the VAE has been widely used in adhesives, 2 coatings, 3 and generic bonding of various polar and non‐polar materials, 4 and so on. It is reported that the VAE polymer emulsion can be used as a formaldehyde‐free adhesive to prepare plywood 5 . And the plywood materials are created by applying adhesives onto the surface of wood veneers, followed by a pressing technique.…”