Preparation and characterization of a novel environment-friendly urea-glyoxal resin of improved bonding performance

Cao, Liang; Pizzi, A.; Zhang, Qianyu; Tian, Heng; Lei, Hong; Xi, Xuedong; Du, Guanben

doi:10.1016/j.eurpolymj.2021.110915

Cited by 25 publications

(18 citation statements)

References 30 publications

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“…Further, MHG resins are also unique because they are highly resistant to boiling water as boiling water soaking bonding strength has never been reported for other glyoxal-related adhesives. According to the results in the literature, − ,,,,− only dry bonding strengths of plywood were reported for pure MG and UG, and a few studies reported cold water soaking bonding strengths. ,,− As for other composite adhesives, to make them more stable toward hydrolysis, more components were used with glyoxal, such as oxidized cassava starch and polyethyleneimine (PEI), leading to, namely, UG-oxidized cassava starch (UGCS) and polyethyleneimine-UG (HBPEIUG) adhesives. Note that PEI is also a branched polyamine containing terminal amino groups.…”

Section: Results and Discussionmentioning

confidence: 99%

Long-Chain Polyamine-Glyoxal Wood Adhesive: Formaldehyde-Free, Green Synthesis, and Ultra-Performances

Jiang,

Duan,

Liu

et al. 2023

ACS Sustainable Chem. Eng.

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Formaldehyde emission from wood-based products has been a threat to human health and the environment due to the use of formaldehyde-based adhesives. Glyoxal (G) was once regarded as a promising substitute for formaldehyde due to its formaldehyde-like reactivity and low toxicity. However, many studies have indicated that the urea-glyoxal (UG) and melamine-glyoxal (MG) reactions did not lead to the desired adhesion property due to cyclization reactions. To prevent cyclization, in this study, a long-chain melamine-1,6-hexanediamine (MH) polymer was used with glyoxal to fabricate wood adhesive via a facile and clean strategy. In contrast to previously reported glyoxal-related wood adhesives, the MHG adhesive exhibited a lower cure temperature, much higher bonding strength, and far superior water resistance. Particularly, when a low hot-press temperature of 80 °C was applied, a dry bonding strength above 2.42 MPa (100% wood failure) and a wet bonding strength (boiling in water for 3 h) of 1.62 MPa were achieved for plywood. With a higher cure temperature of 120 °C applied, a bonding strength above 1.50 MPa was retained with 100% wood failure even after boiling for 72 h. Structural characterizations suggested that the outstanding performances of the MHG adhesive can be attributed to easy formation of highly stable conjugated imine bonds (−N�C−C�N−).

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Section: Results and Discussionmentioning

confidence: 99%

Long-Chain Polyamine-Glyoxal Wood Adhesive: Formaldehyde-Free, Green Synthesis, and Ultra-Performances

Jiang,

Duan,

Liu

et al. 2023

ACS Sustainable Chem. Eng.

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“…Many commercial aldehyde crosslinkers, including glyoxal, glutaraldehyde, and formaldehyde, have been studied and commonly applied in wood-based composite materials and resins to enhance their strength and water resistance. [20][21][22][23][24] Chabba and Netravali found that crosslinking soy protein concentrate-based (SPC) resins with 10% (w/w) glutaraldehyde increased the fracture stress and Young's modulus by 20% and 35%, respectively, along with improvement in moisture resistance. 25 When modified with 5% (w/w) formaldehyde, SPI films significantly increased tensile strength by about 20% and Young's modulus by 15%.…”

Section: Introductionmentioning

confidence: 99%

Self‐healing efficiency of cinnamaldehyde‐crosslinked soy protein resins with elongated soy protein microcapsules

Yong,

Netravali

2024

J of Applied Polymer Sci

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Self‐healing green thermoset soy protein isolate (SPI) based resins, crosslinked with cinnamaldehyde (CA), were developed. Self‐healing was achieved using elongated microcapsules (MCs) as against spherical MCs that have been used in most earlier studies. MCs containing SPI solution as healant within poly(d,l‐lactide‐co‐glycolide) shells were prepared using Water‐in‐oil‐in‐water (w/o/w) emulsion solvent evaporation (ESE) technique. Process parameters such as sodium tripolyphosphate (STP) and poly(vinyl alcohol) (PVA) concentrations and stirring speed were optimized to obtain elongated MCs. The average aspect ratio of MCs was over four. SPI resins crosslinked with 10% CA (10%CA‐SPI) increased Young's modulus and fracture stress by 54% and 87%, respectively, compared with their noncrosslinked counterpart. The resins containing 15% elongated MCs (15%MC‐10%CA‐SPI) showed self‐healing efficiencies of over 42% in fracture stress and about 35% in toughness recovery, after 24 h of healing. Improvement in self‐healing can be attributed to the high aspect ratio of the MCs that increases the probability of MCs being in the path of the microcracks and releasing the healant. Elongated MCs also contain higher amount of healant than spherical ones of same diameter. Self‐healing resins and composites can not only help prevent their premature failure but also improve their performance as well as service life and safety.

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“…So far, various aldehydes have been used as substitutes for formaldehyde, such as glyoxal, furfural or glutaraldehyde. However, although these compounds are less volatile than formaldehyde, they are still classified as cancerogenic mutagenic reprotoxic by the European Chemicals Agency [15,16] …”

Section: Introductionmentioning

confidence: 99%

“…However, although these compounds are less volatile than formaldehyde, they are still classified as cancerogenic mutagenic reprotoxic by the European Chemicals Agency. [15,16] One compound that has been considered as a formaldehyde substitute is HMF, which according to the literature can be produced either from fructose or directly from glucose and occurs as a by-product of sulfite pulping processes and is thus bio-based. [17] Various applications of HMF condensation products with urea, lignins or tannins in particle boards have already been investigated in individual publications, but these do not yet fulfill the properties desired by the industry.…”

Section: Introductionmentioning

confidence: 99%

Novel Synthetic Strategy for the Production of Fully Bio‐Based Binders Using 2,5‐Diformylfuran

et al. 2023

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In this work, resol based binders were prepared with lignin, resorcinol and the bio-based aldehydic platform chemicals 5hydroxymethylfurfural (HMF) and 2,5-diformylfuran (DFF). In preliminary studies, the solubility and stability of DFF in aqueousalkaline conditions was investigated. Various binders were prepared to investigate the influence of the HMF-DFF ratio and the influence of the aldehyde concentration on the molar mass, rheological properties and curing characteristics of the final binders. It is shown that significantly higher molecular weights and viscosities are obtained by using DFF instead of HMF. The properties of the final binder could also be affected by the precise choice of DFF concentration, as this resulted in higher levels of crosslinking. This work offers a novel type of fully bio-based binder that consists of non-toxic components and is therefore less hazardous than some conventional binders.

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Preparation and characterization of a novel environment-friendly urea-glyoxal resin of improved bonding performance

Cited by 25 publications

References 30 publications

Long-Chain Polyamine-Glyoxal Wood Adhesive: Formaldehyde-Free, Green Synthesis, and Ultra-Performances

Long-Chain Polyamine-Glyoxal Wood Adhesive: Formaldehyde-Free, Green Synthesis, and Ultra-Performances

Self‐healing efficiency of cinnamaldehyde‐crosslinked soy protein resins with elongated soy protein microcapsules

Novel Synthetic Strategy for the Production of Fully Bio‐Based Binders Using 2,5‐Diformylfuran

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