Properties of a new renewable sesame protein adhesive modified by urea in the absence and presence of zinc oxide

Wei, Xiaobo; Wang, Xuede; Li, Yaoran; Ma, Yixin

doi:10.1039/c7ra07578b

Cited by 16 publications

(9 citation statements)

References 29 publications

(30 reference statements)

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“…The viscosity of the USP/GUSP adhesives gradually decreased with increasing shear rate. This phenomenon showed that the sesame protein adhesives were shear-thinning fluids, and this result was consistent with Wei et al (2017). The initial viscosity of the USP adhesive without glyoxal addition was 71560 mPa•s.…”

Section: Rheology Properties Analysissupporting

confidence: 81%

“…Sesame (Sesamum indicum L.) is primarily cultivated in Asian and African countries as a traditional oilseed crop, while China has been the first and greatest sesame production and consumption industry in the world (Pathak et al 2014;Wei et al 2017). Sesame seeds have the highest protein (25%) and oil content (55%) among all oilseed crops (Raja et al 2007a,b;Wei et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Performance of a formaldehyde-free sesame protein adhesive modified by urea in the presence and absence of glyoxal

Wei

Wang

2021

BioRes

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Sesame cake and meal, byproducts of the sesame oil process industry and mainly used as feed and fertilizer, are often not optimally utilized and are wasted when the material could be used as a high-quality protein source. This research primarily emphasizes the preparation of a sesame protein-based adhesive with urea and glyoxal modification to use as a wood adhesive. The performance and characterization of the urea and glyoxal modified sesame protein adhesive (USP and GUSP, respectively) were measured precisely. After glyoxal was added, the water resistance of the GUSP adhesive was significantly enhanced, reaching the standard for Type II plywood. The formaldehyde emission test showed that the GUSP adhesive could be utilized as a formaldehyde-free wood adhesive, having a significantly lower than the demand of the E0 level (i.e., 0.5 mg/L). Furthermore, increasing the glyoxal content in the adhesives enhanced the thermal stability but not significantly. A substance with a crosslinking structure was formed from the reaction between the sesame protein and glyoxal, which enhanced the water resistance. Meanwhile, the fractured structure of the GUSP adhesive having a compact surface also was propitious to enhance the water resistance. Thus, the GUSP adhesive could be used as a novel adhesive in plywood fabrication.

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Section: Rheology Properties Analysissupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Performance of a formaldehyde-free sesame protein adhesive modified by urea in the presence and absence of glyoxal

Wei

Wang

2021

BioRes

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“…Liu et al [9] found that undecylenic acid with hydrophobic carbon chain and active carboxyl group was an efficient modifier to enhance the wet shear strength of soya protein isolate-based adhesives. Wei et al [10] discovered that after adding zinc oxide, the wet shear strengths of the sesame protein-based adhesives were improved due to the chelation reaction between sesame protein and Zn 2+ .…”

Section: Introductionmentioning

confidence: 99%

“…Wei et al . [ 10 ] discovered that after adding zinc oxide, the wet shear strengths of the sesame protein-based adhesives were improved due to the chelation reaction between sesame protein and Zn 2+ .…”

Section: Introductionmentioning

confidence: 99%

Effect of urea concentration on properties of peanut protein isolate, arachin and conarachin-based adhesives during urea-epichlorohydrin modification

Chen

2021

R. Soc. open sci.

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To lay a theoretical basis for the preparation of peanut protein-based adhesives and promote the sustainable development of the adhesive industry, properties of peanut protein isolate (PPI), arachin and conarachin-based adhesives modified by urea and epichlorohydrin (ECH) were investigated under different urea concentrations. When the urea concentration was 2 mol l −1 , the wet shear strength of the PPI-based adhesive was 1.24 MPa with the best water resistance. With the increase of urea concentration from 0 to 4 mol l −1 , the apparent viscosity of the PPI-based adhesive increased from 3.87 to 136.80 Pa s and the solid content increased from 18.11% to 31.11%. Compared with conarachin-based adhesive, the properties of arachin-based adhesive were improved more obviously during the combined modification. Scanning electron microscopy images illustrated that when the urea concentration was 2 mol l −1 , the surface of the PPI-based adhesive was more compact and smoother, which was beneficial to the improvement of water resistance and related to the structure changes of arachin and conarachin components. Fourier-transform infrared spectroscopy results indicated that different urea concentrations caused the change of ester and ether bonds in the PPI-based adhesive, which was mainly related to arachin component. Thermogravimetry results suggested that when the urea concentration was 2 mol l −1 , the decomposition temperature of protein skeleton in the PPI-based adhesive reached a maximum of 314°C exhibiting the highest thermal stability. The improvement of the thermal stability of conarachin was greater than that of arachin during the combined modification.

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“…Plant proteins are high-quality renewable resources for formaldehyde-free wood adhesives, and have received widespread attention. A number of previous studies have focused on plant protein-based adhesives, including adhesives based on soy [6], cotton [7], wheat [8] and sesame proteins [9]. Nevertheless, there are few studies on the preparation of wood adhesives based on peanut proteins.…”

Section: Introductionmentioning

confidence: 99%

Peanut meal-based wood adhesives enhanced by urea and epichlorohydrin

Chen

Liu

et al. 2019

R. Soc. open sci.

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Peanut meal (PM) has recently emerged as a potential protein source for wood adhesives, owing to superior features such as high availability, renewability and eco-friendliness. However, the poor properties of unmodified PM-based wood adhesives, compared with their petroleum-derived counterparts, limit their use in high-performance applications. In order to promote the application of PM-based wood adhesives in plywood industry, urea (U) and epichlorohydrin (ECH) were used to enhance the properties of the adhesives and the modification mechanism was investigated. PM-based wood adhesives made with U and ECH were shown to possess sufficient water resistance and exhibited higher apparent viscosity and solid content than without. Fourier-transform infrared spectroscopy results suggested that U denatured PM protein and expose more reactive groups, allowing ECH to react better with U-treated PM protein to form a dense, cross-linked network which was the main reason for the improvement of the properties. The crystallinity increased from 2.7% to 11% compared with the control, indicating that the molecular structure of the resultant adhesive modified by U and ECH became more regular and compact owing to the cross-linked network structure. Thermogravimetry tests showed that decomposition temperature of the protein skeleton structure increased from 307°C to 314°C after U and ECH modification. Scanning electron microscopy images revealed that using U and ECH for adhesives resulted in a smooth protein surface which prevented moisture penetration and improved water resistance. PM-based adhesives thus represent potential candidates to replace petroleum-derived adhesives in the plywood industry, which will effectively promote the rapid development of eco-friendly adhesives and increase the added value of PM.

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Properties of a new renewable sesame protein adhesive modified by urea in the absence and presence of zinc oxide

Abstract: Sesame protein (SP) is a new renewable resource for wood adhesives because of its brilliant performance, which is non-toxic and harmless to human health during the process of using plywood.

Cited by 16 publications

References 29 publications

Performance of a formaldehyde-free sesame protein adhesive modified by urea in the presence and absence of glyoxal

Performance of a formaldehyde-free sesame protein adhesive modified by urea in the presence and absence of glyoxal

Effect of urea concentration on properties of peanut protein isolate, arachin and conarachin-based adhesives during urea-epichlorohydrin modification

Peanut meal-based wood adhesives enhanced by urea and epichlorohydrin

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