Preparation and characterization of urea–formaldehyde adhesives modified with glyoxalated tannin

Xu, Gaoxiang; Tian, Heng; Xi, Xuedong; Song, Jiaxuan; Lei, Hong; Du, Guanben

doi:10.1007/s00107-022-01819-1

Cited by 11 publications

(7 citation statements)

References 36 publications

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“…Pure chitosan adhesive has a higher dry/wet bonding strength. We compared the boiling water resistance of the pure chitosan adhesive with formaldehyde-based adhesives (UF, , PF, , and MUF − ) and biobased adhesives (e.g., cellulose-based and sucrose-based) (Figure e). Pure chitosan adhesive is still competitive, in terms of bonding performance.…”

Section: Resultsmentioning

confidence: 99%

High-Performance Wet Adhesion of Wood with Chitosan

Chen,

Liu,

Cai

et al. 2024

ACS Sustainable Chem. Eng.

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Strong adhesion is desirable when using wood with a wide range of moisture contents, but most of the existing adhesives face challenges in bonding wood under high-humidity conditions. Here, we report a simple strategy that involves the one-step dissolution of chitosan powder in acetic acid at room temperature, followed by direct use of the resulting chitosan slurry as an adhesive on dry/wet wood veneers. Mechanical interlocks and hydrogen bonds at cell wall interfaces provided strong adhesion. Moreover, heat treatment induced recrystallization and cross-linking of chitosan chains, resulting in a high cohesion. Meanwhile, heat treatment caused the acetylation reaction between the protonated amino groups (NH3 +) of chitosan and acetate groups (CH3COO–) to produce hydrophobic acetyl groups. In addition, we prepared wooden products such as plywood (dry veneers) and wooden straws (wet veneers) using wood veneers with different moisture contents. The tensile shear strengths under 63 °C water and under boiling water of plywood were 1.12 and 0.81 MPa, respectively. The compressive strength of wooden straws is up to 35.32 MPa, which was higher than that of existing commercial straws (such as paper straws, polypropylene straws, and plastic straws). The chitosan wet adhesive showed good water resistance, high bonding strength, environmental degradability, and nontoxicity, thus providing a highly promising alternative to traditional wood composite adhesives.

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Section: Resultsmentioning

confidence: 99%

High-Performance Wet Adhesion of Wood with Chitosan

Chen,

Liu,

Cai

et al. 2024

ACS Sustainable Chem. Eng.

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“…Moreover, the majority of plywood specimens bonded using TUF resin displayed low formaldehyde release, with those prepared at 70 °C and 1.5 h showcasing a reduction of nearly 39% in emissions. To obtain glyoxalated tannin (GT), Xu et al 38 employed glyoxal to activate bayberry tannins. Subsequently, they utilized this GT to modify UF resins (Fig.…”

Section: Biomass In Wood Adhesivesmentioning

confidence: 99%

Recent progress of biomass in conventional wood adhesives: a review

Tian,

Wang,

et al. 2023

Green Chem.

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“…Tannin, a comple large in molecular weight with electrostatic and hydrogen bonding with re saccharides [34,35], so the viscosity of the tannin solution was large (951.1 fore, excessive viscosity was an unavoidable problem during the preparatio adhesives using tannins. High viscosity resulted in poor fluidity of the adhe ing adhesive application and adhesive distribution during hot-pressing a the bonding performance of the prepared plywood [5,39]. Sucrose molecu hydroxyl radicals with a strong affinity for water molecules and are far sma than tannins, so the viscosity of pure sucrose solution was very small, on When the m(tannin):m(sucrose) was 80:20 or 60:40, the viscosities of the t adhesives were 948.9 mPa•s and 919.2 mPa•s, respectively, and this decline the increase in sucrose.…”

Section: The Effect Of Mass Ratio Of the Tannin To Sucrose On The Per...mentioning

confidence: 99%

“…Therefore, excessive viscosity was an unavoidable problem during the preparation of the wood adhesives using tannins. High viscosity resulted in poor fluidity of the adhesives, hindering adhesive application and adhesive distribution during hot-pressing and degrading the bonding performance of the prepared plywood [5,39]. Sucrose molecules are rich in hydroxyl radicals with a strong affinity for water molecules and are far smaller molecules than tannins, so the viscosity of pure sucrose solution was very small, only 55.3 mPa•s.…”

Section: The Effect Of Mass Ratio Of the Tannin To Sucrose On The Per...mentioning

confidence: 99%

Fully Bio-Based Adhesive from Tannin and Sucrose for Plywood Manufacturing with High Performances

Xiao

Liang

et al. 2022

Materials

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Fully bio-based adhesives are beneficial to reduce the dependence of the wood adhesive industry on synthetic resins based on petrochemical resources and enhance the market competitiveness of adhesives. A fully bio-based wood adhesive composed of tannin and sucrose was developed and successfully used in the preparation of plywood. Effects of the preparation technology on the bonding strength and water resistance of plywood were investigated, and the properties of the adhesive were analyzed by Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG) and X-ray diffraction (XRD) in this study. The results showed that: (1) Compared with other biomass adhesives, tannin–sucrose adhesive had the characteristics of high-solid content and low viscosity, which had the potential to prepare particleboard and fiberboard. (2) A proper mass ratio of tannin to sucrose was key to obtaining a tannin–sucrose adhesive with better properties. (3) The optimum preparation process of tannin–sucrose adhesive for plywood was as follows: hot-pressing temperature of 210 °C, hot-pressing time of 1.2 min/mm, m(tannin):m(sucrose) of 60:40 and adhesive loading of 160 g/m2. Under these conditions, the water-resistant bonding strength of the plywood was 0.89 MPa, which met the strength requirements of the Type II standard of plywood in GB/T 17657-2013. (4) The hot-pressing temperature played a decisive role in the tannin–sucrose adhesive, and the good performance of the plywood was maintained when the temperature was 210 °C or above. Thus, the prepared tannin–sucrose adhesive had high-bonding strength, good water resistance and thermal stability.

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Preparation and characterization of urea–formaldehyde adhesives modified with glyoxalated tannin

Cited by 11 publications

References 36 publications

High-Performance Wet Adhesion of Wood with Chitosan

High-Performance Wet Adhesion of Wood with Chitosan

Recent progress of biomass in conventional wood adhesives: a review

Fully Bio-Based Adhesive from Tannin and Sucrose for Plywood Manufacturing with High Performances

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