Abstract

The development of eco-friendly adhesives for wood composite products has been a major topic in the field of wood science and product engineering. Although the research on tannin-based and soybean protein-based adhesives has already reached, or at least nears, industrial implementation, we also face a variety of remaining challenges with regards to the push for sustainable adhesives. First, petroleum-derived substances remain a pre-requisite for utilization of said adhesive systems, and also the viscosity of these novel adhesives continues to limit its ability to serve as a drop-in substitute. Within this study, we focus upon the development of an eco-friendly plywood adhesive that does not require any addition of petroleum derived reagents, and the resultant liquid adhesive has both high solid contents as well as a manageably low viscosity at processing temperatures. Specifically, a system based on sucrose and ammonium dihydrogen phosphate (ADP) was synthesized into an adhesive with ~80% solid content and with viscosities ranging from 480–1270 mPa·s. The bonding performance of all adhesive-bound veneer specimens satisfied GB/T 9846-2015 standard at 170 °C hot pressing temperature. To better explain the system’s efficiency, in-depth chemical analysis was performed in an effort to understand the chemical makeup of the cured adhesives as well as the components over the time course of curing. Several new structures involving the fixation of nitrogen speak to a novel adhesive molecular network. This research provides a possibility of synthesizing an eco-friendly wood adhesive with a high solid content and a low viscosity by renewable materials, and this novel adhesive system has the potential to be widely utilized in the wood industry.

Highlights

  • Nowadays, the development of bio-based materials has been a main topic in the field of material science and technology [1,2,3,4]

  • To evaluate the bond performance of SADP adhesives, three-ply plywood was fabricated using the synthesized SADP adhesives, and the results of dry and wet shear strength are shown in Figures 3 and 4

  • The profiles visualized in both figures show that the shear strength of the boards bonded with SADP 1 and SADP 2 exhibited a positive relationship with hot pressing temperature

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Summary

Introduction

The development of bio-based materials has been a main topic in the field of material science and technology [1,2,3,4]. Compared to novel bio-based materials, the traditional wood-based materials are more heavily utilized by societies worldwide Most of these materials (such as particleboard [5], plywood [6,7,8,9], medium density fiberboard [10], and oriented strand board [11]) are manufactured by bonding wooden elements with adhesives derived from petroleum. To avoid the utilization of formaldehyde, the isocyanate-based resins are developed and used in wood industry, the raw materials of these adhesives are derived from fossil resources, which are not renewable and continue to decrease These concerns have spurred manufacturers of wood based materials towards critical research to establish product portfolios that contain more sustainable and green products within

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