INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Ying Zhu,Fudong Zhang,Ruohong Bian,Guodong Zeng,Jiongjiong Li,Yan Lyu,Jianzhang Li
The preparation of industrial lignin-based adhesives generally requires the use of large amounts of petrochemical products or toxic and hazardous reagents, which severely limits their widespread application in the wood-based panel industry. In this study, we present a novel approach for synthesizing an eco-friendly lignin-based wood adhesive using aminated alkali lignin (AAL) and epoxy-terminated hyperbranched polyester (EHBP). The AAL was prepared by aminating alkali lignin through a green and formaldehyde-free method. The EHBP was synthesized by grafting epichlorohydrin onto biomass-derived hyperbranched polyester. The resulting adhesive performed excellent bonding strength of 2.41 MPa and debonding work of 0.711 J, which were 3.63 and 15.2 times higher than those of the pure lignin adhesive, respectively. This exceptional bonding strength surpassed that of most previously reported biomass adhesives. The moisture uptake value of the adhesive decreased by 75.6 % and the residual rate increased by 239.2 %. In addition, the prepared adhesive exhibited enhanced mold resistance. Importantly, the adhesive was primarily composed of biomass materials and their derivatives and was less costly than most commercial formaldehyde-based and bio-based adhesives. This work presents new possibilities for the high-value utilization of industrial lignin and the development of formaldehyde-free and environmentally friendly adhesives.
研究领域:
材料科学
·
环境科学
·
林业工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jinying Ma,Hanzhong Xiao,Wan Zheng,Baicun Hao,Xinman Li,Yujia Wang,Yang Shi,Xin Huang
Conventional tannin adhesives prepared by the phenol-aldehyde condensation mechanism suffer from the formaldehyde problem. Herein, we developed environmentally benign and formaldehyde-free tannin-derived non-covalent (TNC) adhesives by manipulating the multiple-hydrogen bonding interactions between tannins and poly(vinyl alcohol) (PVA). The as-prepared TNC adhesives featured exceptional interfacial compatibility due to the amphiphilic nature of tannins, which were also capable of providing high-performance non-covalent adhesion to different substrates, including wood, glass and iron. Molecular dynamics simulations combined with the hydrogen-bond breaking experiments manifested that the hydrogen-bonding interactions between tannins and PVA were essential for the TNC adhesives to accomplish high-performance adhesion. The TNC adhesives were further applied in noncovalent adhesion of xylem fibers to prepare high-performance functional materials featured with high static bending strength. Based on this strategy, a series of environmentally benign and formaldehyde-free tannin-derived adhesives were also successfully developed by using larch tannins and black wattle tannins, respectively.
研究领域:
材料科学
·
胶粘剂化学
·
环境友好型材料
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Xinhang Li,Huiyu Chen,Wentao Wang,Yaqing Liu,Peihua Zhao
A novel formaldehyde-free phosphorus–nitrogen flame retardant with multiple reactive groups, dioxo (3-triethylphosphite-5-chlorine−1−triazine) neopentyl glycol (DTCTNG), has been synthesized and was applied to cotton fabrics. The molecular structure of DTCTNG was characterized by FTIR , 1 H NMR , and 31 P NMR. The thermal degradation property of DTCTNG was assessed by thermogravimetric analysis (TGA), which revealed that it has good thermal stability on the high temperature condition. To achieve a covalent bond between DTCTNG and fiber matrix, the finishing conditions of cotton fabrics with different add-on's DTCTNG were investigated by using TGA, vertical flammability test, limiting oxygen index (LOI) and scanning electron microscope test (SEM). The water resistance of the treated cotton fabrics under optimal finishing condition was studied by LOI test. Furthermore, the mechanism of cross-linking reaction between DTCTNG and cotton fiber was discussed by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). All the results showed that cotton fabrics treated with DTCTNG has good flame retardancy and steady water resistance.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ying Zhu,Ruohong Bian,Yang Yu,Jiongjiong Li,Cheng Li,Yan Lyu,Xiaona Li,Jing Luo,Jianzhang Li
The conversion of industrial lignin into wood adhesives offers a solution to issues related to formaldehyde pollution and the reliance on petrochemical resources of traditional formaldehyde-based resins, while promoting environmental and energy sustainability. However, conventional methods for preparing lignin-based adhesives generally involve the use of materials like formaldehyde, organic solvents, and costly epoxy, hindering their industrial application. This study introduces a novel approach for producing eco-friendly lignin-based wood adhesives using aminated lignin-Cu nanoparticles. The lignin-Cu nanoparticles were synthesized in water as a single solvent through a sedimentation method. Amination modification was achieved by grafting amino-terminated hyperbranched polyamide onto the nanoparticles via a Schiff base reaction. The prepared adhesive demonstrated a remarkable bonding strength of 1.51 MPa and debonding work of 0.272 J, which were 2.75 and 6.33 times higher than those of the pure lignin adhesive, respectively. Moreover, the adhesive exhibited improved water resistance with a wet shear strength of 1.15 MPa and sustained mildew resistance for approximately 100 days. Notably, this adhesive was synthesized without the use of formaldehyde, phenol, acids, or organic solvents, minimizing reliance on fossil resources and lowering costs compared to many formaldehyde-based and biomass adhesives. This research opens up new avenues for the efficient utilization of industrial lignin and the production of formaldehyde-free, environmentally friendly adhesives, which holds significant promise for energy conservation, emission reduction, and sustainable development within the wood-based panel industry.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 12
·7553-7567
·
IF 3.917
Liu Mingsheng,Huang Shuo,Zhang Guangxian,Zhang Fengxiu
Abstract A durable and effective flame retardant (FR) was synthesized in this work by taking advantage of the high reactivity of a cyclodiphosphazane derivative, without the use of formaldehyde. The FR is halogen-free and has the synergistic effect of phosphorus, nitrogen and silicon. Fire resistance of the cotton fabrics is significantly enhanced after the FR treatment. The limiting oxygen indices of cotton treated with 30% FR increase from 18.2 to 52.9% and decrease to 27.2% after 50 launder cycles, demonstrating that the proposed material is a durable FR. The thermo-gravimetric analysis results indicate that compared with the control cotton, the degradation process of the treated cotton occurred at a lower temperature range, the degree of degradation was lower, and the residue is improved. The total heat release and the effective heat combustion values are notably lower for the treated cotton than the control cotton. Furthermore, mechanical property tests demonstrate that the tensile strength is largely retained, while the bending length of the treated cotton partly increases. The surface morphology of the treated cotton is investigated with scanning electron microscopy. Fourier transform infrared and elemental analysis show that the FR was successfully grafted onto the surface of the cotton fabric. 1 H, 13 C, and 31 P nuclear magnetic resonance verify the chemical structure of the FR.
Graphic abstract
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 18
·9889-9899
·
IF 3.917
Tian Peixiu,Liu Mingsheng,Wan Caiyan,Zhang Guangxian,Zhang Fengxiu
Abstract A flame retardant ammonium salt of diethylene glycol phosphonate (ADGP) is synthesized using low-cost materials (diethylene glycol, phosphoric acid, and urea). The flame retardant is grafted on the cotton fabrics via P–O–C covalent bonds. The structure of the flame retardant is characterized by nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR). The combustion performance of the treated and untreated cotton fabrics is evaluated based on vertical flammability, limiting oxygen index (LOI), and cone calorimetry. As the concentration of the flame-retardant ADGP increased, the cotton fabric treated with 40% ADGP exhibited an LOI of 43.7% and superior fire resistance, whereas physiological comfort showed a decrease. Scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were used to characterize the surface morphology, chemical composition, and crystal structure of the control and treated cotton fabrics. The thermal stability of the treated and untreated cotton fabrics is determined by thermogravimetric analysis. The results indicated that the treated cotton showed superior flame retardancy. Graphic abstract
研究领域:
材料科学
·
纺织工程
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产品关联
DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2023
·Vol. 38
·期 4
·545-553
·
IF 1.2
Min Liang,Jingya Gong,Jianfeng Xu,Ru Liu,Ling Long
Formaldehyde-free adhesives are gaining attention due to their compatibility with green production methods. Decorative base paper (DBP) is known for its physical strength and printability and has a high ability for absorbing aldehyde-free adhesives for impregnation. In this paper, DBP was prepared with TiO 2 and SiO 2 combined with polyvinyl alcohol (PVA), where the amount of TiO 2 was reduced in the pulp process. The prepared DBP was impregnated by aldehyde-free adhesive and hot-pressed on wood-based panels. The results showed that upon SiO 2 coating, the surface smoothness of base paper increased by 132.3 %, whereas the tensile strength increased by 33.6 %. Furthermore, the colour density of cyan, magenta, yellow and black colours increased by 75.4 %, 99.2 %, 51.9 % and 90.5 %, respectively. The surface properties like surface bonding strength and wear resistance of the covered wood-based panels were found to satisfy the standard requirements, which indicates the products can be used for furniture products.
研究领域:
材料科学
·
绿色制造
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Wei Zhao,Hai-Bo Zhao,Jin-Bo Cheng,Wenxiong Li,Jiayan Zhang,Yu-Zhong Wang
Expandable polystyrene (EPS) foam, one of the most widely used thermal insulation of building materials, is highly flammable, while its traditional flame-retardant coating has been severely restricted by the low efficiency and the use of toxic formaldehyde adhesive. Herein, we demonstrate a formaldehyde-free phosphorus-containing polysiloxane coating that acts as both an adhesive and a flame retardant for EPS foams. In this design, on one hand, the high adhesion of the polysiloxane can evenly and tightly bind the EPS beads and expandable graphite (EG, a flame-retardant synergist filler) at a relatively low additive loading, thus leading to durable thermal insulation even under high humidity conditions. On the other hand, the functional coating can promote the formation of P/Si-containing graphited char layers during the combustion of the EPS composite, which can effectively isolate oxygen, heat, combustible compounds, and smoke particles. As a result, the EPS composite showed excellent flame retardancy with a high limiting oxygen index of 36%, a UL-94V-0 rating, and a significantly reduced peak heat release rate (−76%), while the smoke release can be greatly suppressed both in cone calorimetry and smoke density tests. This work provides a new strategy for the design of environmentally friendly coatings, which can give EPS foam high fire safety and excellent comprehensive performance.
研究领域:
材料科学
·
环境科学
·
建筑工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Yunchuan Zeng,Pengwu Xu,Weijun Yang,Hong Chu,Wei Wang,Weifu Dong,Mingqing Chen,Huiyu Bai,Piming Ma
The weak bonding strength and poor water resistance of soy protein-based adhesive have limited its application as a non-formaldehyde adhesive in wood manufacturing industry. In this work, a novel soy protein-based adhesive was prepared by introducing a tailor-made crosslinker with multiple epoxy groups and flexible long chains without any solvent or catalyst via a one-pot strategy. The multiple epoxy groups could react with the hydrophilic groups (hydroxyl and amino) on the soy protein molecules to construct densely crosslinking networks, which was proved by the sol–gel results. The crosslinking networks were beneficial to enhancing the bonding strength and water resistance of the adhesive. Consequently, the dry bonding strength and the wet bonding strength were increased from 1.11 MPa and 0.22 MPa to 2.79 MPa and 1.12 MPa, respectively, marking increments of 151% and 409% when compared to the pristine soy protein-based adhesive. The bonding strength was beyond the standard of type II plywood (≥0.7 MPa, GB/T17657 − 2013). Furthermore, the flexible long chains of the crosslinker was also conductive to improving the toughness of the adhesive. Therefore, this work may open a feasible way to produce non-formaldehyde adhesives with superior bonding strength and water resistance, and thus broadening the application of soy protein.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xiaoyu Gong,Tanglong Liu,Shanshan Yu,Yi Meng,Jie Lu,Yi Cheng,Haisong Wang
It is significant to develop low cost, environmental friendly and renewable bio-based adhesives without formaldehyde. In this paper, acetonitrile extracting lignin (AEL) was used as raw material, modified by phenol and mixed with aqueous of polyvinylpyrrolidone (K30), a biocompatible agent, to prepare a high-performance formaldehyde-free lignin-based adhesive. The results of the experiments showed the optimal condition as follows: the mole ratio of lignin to phenol 1:2, the reaction temperature 80 ℃, the reaction time 3 h, the concentration of K30 10%, mole ratio of PAEL to K30 1:0.4, the shear strength of the adhesive reach up to 1.70 MPa (Technical lignin-based adhesive only 0.11 MPa), and it was still as high as 1.02 MPa after soaking in water for 24 h. Compared with the adhesive (1.12 MPa) on the market, the as-prepared sample shows a much higher shear strength, meeting the National Primary Standard of plywood (≥1.0 MPa) and according with national standard.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Wood Material Science & Engineering
·
2025
·
IF 2.1
Yani Wang,Mengjie Jia,Yiyang Qi,Xiaoge Ji,Shijing Sun,Zhongyuan Zhao
In this study, a formaldehyde-free adhesive was developed for plywood, utilizing lactic acid (LA), polyvinyl alcohol (PVA), and polymeric methylene diisocyanate (p-MDI). The optimal adhesive formulation was achieved with a 7:3 mass ratio of LA to PVA, 60% solid content, and synthesized at 100°C for 2 h with 7.5% p-MDI incorporated as the curing agent. Plywood manufactured with this adhesive, under hot pressing conditions at 130°C for 10 min and a spread rate of 200 g/m², exhibited the highest wet shear strength of 0.95 MPa, exceeding the China National Standard GB/T 9846–2015 (wet strength of Class II plywood ≥ 0.7 MPa). Curing behavior was evaluated using insoluble mass proportion (IMP) and thermal analysis. After curing at 130°C for 10 min an IMP content of 51.3% was observed, and thermal analysis revealed that polymerization occurred between 120°C and 170°C. The curing mechanism was further investigated and the results indicated that reactions between the isocyanate groups of p-MDI and the hydroxyl, ester, and carboxyl groups of the prepolymer chains resulted in the formation of a crosslinked polymer network, which contributed to the superior bonding performance. This study provided a novel and eco-friendly approach for the development of formaldehyde-free adhesives for plywood applications.
研究领域:
材料科学
·
高分子化学
·
胶粘剂技术
·
木材科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yixin Yu,Ran Xu,Xuetong Wu,Bilian Wang,Mingzhen Zhang,Kelong Fan
Lignin, a major component of plant cell walls, is the most abundant source of natural aromatic polymers. Efficient production of its valuable degradation products requires highly selective catalysts. This study introduces a spin-state-modulated nanozyme system for precise lignin depolymerization into targeted biobased chemicals. Precise copper spin state control in two-dimensional (2D) copper-based metal organic framework (MOF) nanozymes, achieved via redox treatment and ligand exchange modulation, replicates natural laccase multicopper center spin synergy. Integrated experiments and theory reveal a volcano-shaped spin state-activity correlation, enabling synthesis of optimized nanozyme Cu(OH) 2 BDC-LA-OAc (COHBLO). This material demonstrates exceptional laccase-mimicking activity, with a peak reaction rate 70 times higher than natural laccase and a 5.14-fold specific activity increase. Through laccase-like catalysis, it selectively cleaves lignin β-O-4 linkages, directionally yielding fragments rich in phenolic hydroxyl groups. Their efficient reaction with epoxy groups produces a nanolignin-based epoxy adhesive. Featuring a three-dimensional cross-linked network, this adhesive delivers superior bonding under varied conditions. Its shear strength significantly surpasses commercial phenolic resins while eliminating conventional adhesive formaldehyde emissions. This study advances 2D MOF nanozyme design and establishes an integrated pathway from controlled lignin depolymerization to high-performance adhesive production, providing key theoretical and practical foundations for biomass valorization and sustainable adhesive development.
研究领域:
催化
·
材料科学
·
可持续化学
·
生物质高值化
·
纳米技术
·
高分子科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）