As the wood-based panel market expands, impregnated paper is a key surface-decoration material for furniture, flooring, and construction panels, with melamine-formaldehyde (MF) adhesive-impregnated paper prevailing for its adhesion, water resistance, and abrasion resistance. The intrinsic brittleness of MF adhesive, however, makes decorative plywood prone to surface cracking, and moisture fluctuations under hot-cold cycling or extreme climates further shorten service life. We synthesized a hyperbranched polysiloxane (HBPSi-NH2) from 3-aminopropyltriethoxysilane (APTES) and 2-methyl-1,3-propanediol (MPD) and used it to toughen MF adhesive. The modified MF adhesive-impregnated paper was hot pressed onto plywood to evaluate the adhesive, the impregnated paper, and the resulting decorative plywood. Mechanistically, HBPSi-NH2 provides Si-O-C flexible segments that offer low-energy rotational pathways, while surface Si-OH groups form reversible hydrogen bonds with MF -NH2 and -OH groups, creating recoverable energy-dissipation units within the three-dimensional network. This architecture strengthens HBPSi-NH2/MF interfacial interactions and promotes stress redistribution and energy dissipation under tension, thereby enhancing toughness. At 2 wt% HBPSi-NH2, the 4HBPSi-NH2/MF adhesive-impregnated paper reached 20.2% elongation at break, nearly double the neat MF counterpart (10.2%). After hot-press lamination to plywood, the surface showed no detectable cracking. Collectively, these results demonstrate that HBPSi-NH2 effectively toughens MF adhesive and helps prevent cracking in decorative plywood.

Casein aqueous ink was widely used in the area of paper printing as finishing materials for wood-based furniture products. However, the water-based ink has poor water resistance limiting the application. In this study, the ink binder of casein was modified with compound of N-methylolacrylamide (NMA), diacetone acrylamide (DAAM), and caprolactam (CPL) to enhance the water resistance, while balancing the glue absorption capacity. The effect of NMA concentration on the performance of casein aqueous ink was also assessed. The modified aqueous inks were roll-coated on the decorative base paper. The results showed that the stability, hydrophilicity and water resistance of the modified casein were significantly enhanced. Therefore, remove redundancy casein inks showed significant improvements on water stability, water resistance and glue absorption. When the content of NMA was 1.5 g, the average hydrodynamic size and the absolute value of Zeta potential of casein were 350 nm and -45 mV, respectively, showing the improved stability in water system. Thus, the surface contact angle of casein was minimal of 34.1 degrees, and the water retention rate was maximal at 72.5%. The maximum water retention rate of the modified casein ink was obtained at NMA content of 1.5 g with hydrodynamic size of 120 nm and zeta potential of - 31 mV, At this time, remove repetition of casein ink reached 136%, which was a significant increase of 29.5% uptake compared with the unmodified casein ink. These findings indicate that there is a strong correlation between the stability, water resistance, and hydrophilicity of casein and the stability and water resistance of casein inks, and that modified casein has a great potential for application as a water-based ink joining material for decorative papers.

ABSTRACT To investigate the permeability of formaldehyde‐free waterborne polyurethane acrylate adhesives during the impregnation of decorative paper, this study examines permeability from the perspectives of both the adhesive and the base paper. Four adhesive formulations were used to impregnate 70 g/m 2 decorative base paper to evaluate the effect of different adhesive compositions on permeability. Subsequently, based on the optimal adhesive formulation identified, the influence of crosslinker content on the permeability was further investigated. Finally, the selected adhesive formulation was applied to base papers with different grammage, both printed and unprinted, to examine the effect of paper‐related factors. The penetration process and curing behavior were characterized using a dynamic penetration analyzer, ultra‐depth microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and Fourier‐transform infrared spectroscopy (FT‐IR). The results indicate that the viscosity of the adhesive directly affects its permeability. As the grammage of the decorative paper increases, the fiber content per unit area rises, leading to reduced permeability of the adhesive. Consequently, the impregnation process takes longer with increasing paper grammage. After printing, ink particles fill some of the surface and internal pores of the paper, resulting in decreased permeability. During the high‐temperature curing stage after impregnation, the crosslinker reacts with carboxyl groups in the adhesive system, hydroxyl groups in the paper fibers, and other active functional groups, forming a three‐dimensional crosslinked network that enhances the internal bond strength of the impregnated paper. By systematically investigating permeability from both adhesive and paper perspectives, this study provides a theoretical foundation for the production of decorative paper and supports its practical application in industrial settings.

"Skin-tactile" coatings with a wrinkled surface and comfortable tactile sensation are widely used in furniture, wood-based panels, and decorative materials. However, their performance is often negatively influenced by external factors including temperature, humidity, and friction, thus compromising the product quality. To address this, by leveraging organic-inorganic synergistic toughness to enhance tactile and thermal properties, in this study we present a UV-curable wood coating with wrinkled surface, reinforced with SiO2-loaded casein (CA)-modified cellulose nanofibers (S-CNFs) to form an entangled structure. CA reacts with aldehyde- modified cellulose nanofibers (CNFs) via a Schiff-base reaction between amino and aldehyde groups, which also improves the CNF dispersibility in the UV-cured coating. The resulting wrinkled structure, combined with S-CNFs, exhibits superior tactile performance, achieving a 13 % stress relaxation rate, a rebound residual distance of 0.6 mm, and a friction coefficient of 0.2. Additionally, the modified wood coating demonstrates enhanced thermal stability: compared to the control, the heat release rate (HRR), total heat release (THR), and total smoke release (TSR), decrease by 28 %, 54 %, and 46 % respectively. Furthermore, the wrinkled structure endows the coating with self-matting property, hydrophobicity, and excellent durability. This facile strategy offers a promising approach to prepare durable, aesthetically pleasing skin-tactile coatings, with significant potential applications.

Abstract Inspired by natural wrinkled surfaces, artificial surfaces with biomimetic wrinkled structures have been widely used to improve optical properties, wettability, and antibacterial properties. However, the preparation of wrinkled structures has the disadvantages of long-time consumption and complex processes. Herein, we prepared a self-wrinkling polyurethane-acrylate (PUA) wood coating via biomimetic self-wrinkling patterns by using a light-emitting diode (LED)/excimer/mercury lamp curing system, which was capable of self-matting, anti-fingerprint and skin-tactile performance. By adjusting the irradiation intensity in the curing system, the wavelength (λ) and amplitude (A) of wrinkles on the coating surface were controlled to enhance the coating performance. After curing by the LED, excimer, and mercury lamps at energy intensities of 500, 30, and 300 mW/cm2 respectively, the self-wrinkling coating showed excellent surface performance. The self-wrinkling coating represented low gloss of 4.1 GU at 85°, high hardness of 4H. Interestingly, the coating surface had a high hydrophobicity (104.5°) and low surface energy (29–30 mN/m) and low coefficient (COF) of friction (0.1–0.2), which were consistent with those of the human skin surface. Besides, the wrinkled structure also improved the thermal stability of the coating samples. This study provided a promising technique for the mass production of self-wrinkling coatings that could be used in wood-based panels, furniture, and leather.

With the changes in people's living standards and aesthetic perspectives, the matting films with wrinkled surfaces play a crucial role in fields such as decorative materials, wooden furniture, wood-based panels and industrial coatings. In this paper, the UV-cured polyurethane acrylate (PUA) films with self-matting and anti-fingerprint performance on the wood-based panels was prepared and developed the wrinkled surface by using excimer/mercury dual UV curing. The results showed that the roughness, wavelengths (lambda) and amplitudes (A) of wrinkles surface were positively correlated with the excimer irradiation time and negatively correlated with the mercury lamp irradiation time. Furthermore, the increasing irradiation time improved the degree of curing and crosslink density of the cured films, which enhanced the mechanical properties and durability of the cured film. Consequently, the prepared UV-cured PUA film exhibited excellent self-matting with a gloss of 3.4 GU at an incident angle of 60 degrees and maintained the gloss value < 5 GU after 500 times rubs and 1 hour corrosion. Additionally, the self-matting films with wrinkled surface enhanced the hydrophobicity and anti-fingerprint performance of the surface. Besides, the cured film presented high physical performance with hardness of 4 H and adhesion of 0 grade. These results provide a reference for the further application of self-matting films in wood-based panels, furniture and interior decoration fields.

In this study, the impact of incorporating cellulose nanofibrils (CNF) and carboxylated organo-montmorillonite (OMMT), separately or in combination, into a UV-curable wood coating was evaluated for performance enhancement. This study investigated the influence of nanoparticle loading percentage on the mechanical properties and thermal behavior of the coating, as well as the surface properties of digitally printed decorative wood-based panels. The results indicated that the addition of CNF or OMMT increased the viscosity of the polymer solutions. Although CNF randomly oriented within the matrices, OMMT adhered to the surface of the polymer matrix. Chemical crosslinking was observed between CNF/OMMT and the coating. The addition of CNF and OMMT improved the thermal stability of the neat UV curing coating. The tensile strength of nanocomposite films with a 6 wt% loading of CNF increased significantly from 7.63 MPa to 12.73 MPa compared to pure films. The reinforcing effect of CNF on the tensile performance was significantly better than that of OMMT. Adding CNF to the matte coating slightly improved the clarity of the printed decorative panels. When CNF and OMMT were added together in the coating, there was a synergistic enhancement in the low gloss and high pencil hardness of the panels. Highlights Both CNF and OMMT were chosen to achieve performance improvements A simple filling method was adopted for preparation of reinforced coating The nanocomposite films exhibited fine thermal and mechanical properties The better integrated property was obtained from the C + CNF3 + OMMT0.8 sample The physicochemical interaction of nanofiller with polymer molecule existed

Inspired from human skin, micro- and nano-wrinkled wood surface with skin-tactile performance was designed and developed using a waterborne UV-curable polyurethane acrylate coating and cellulose nofibers (CNF). To further improve the properties, the CNF was diacetylated to D-CNF and further grafted with a hyperbranched polymer containing rich end amino groups (HB-CNF). The surface structure and chemical reactions were characterized, and the skin-tactile performance of the coating was comprehensively investigated. The HB-CNF exhibited excellent dispersion in the coating, and extensive reactions occurred between the two through the -NH2 and terminal -NCO groups, resulting in much improved mechanical properties and durability. Microwrinkles with a width of approximately 12-15 mu m and a height of 8-14 mu m were created, and nanoprotrusions of wrinkles ranging from to 50-100 nm were obtained. The coated surface was hydrophobic and exhibited high resilience after compression, with a gloss of 3.3 GU at an incident angle of 60 degrees and a static friction coefficient of 0.26, both of which were similar to those of human skin. The results presented an effective strategy for high-performance wood products with a good feeling, which is helpful to improve the market competitiveness and meet the people's pursuit of a better life.

To enhance the surface properties of a thin ultraviolet (UV)-curable matte coating film (less than 20 mu m) for the digital printing decorative panels, the aldehyde-containing cellulose nanofibril (CNF) coupled with hyperbranched poly (amido amine) grafting was selected as a reinforcing agent. The viscoelastic properties of the coating and physical and mechanical characteristics of the corresponding decorative panels were evaluated. The results revealed that the incorporation of the modified CNF increased the viscosity of nanocomposite coatings at low shear rates, while at shear velocities exceeding 10 1/s, the viscosity approached that of the pure coating. The modified CNFs dispersed well in coatings and the nanocomposite coating showed excellent stability. Moreover, the incorporation of CNF clearly enhanced the tensile strength of the coating film. Additionally, the modified CNF physically and chemically bonded to the polymer chains within the UV-curable coating. Furthermore, the modified CNF facilitated the optimal distribution of silica in the acrylic polymer when added at 5 wt%. The panels with the modified matte coating exhibited marginally improved clarity compared to that of the original boards. Moreover, the inclusion of the modified CNF resulted in reduced gloss, enhanced hardness, and improved yellowing resistance compared to the original panels, thereby enhancing the quality of the new product.

Biomass waste, an attractive renewable carbon source, has great potential for carbon reduction. In recent years, high-performance porous carbon materials prepared from agricultural and forestry waste have demonstrated significant promise for applications in the field of dye wastewater purification. In this study, cork waste from Quercus variabilis was utilized as a raw material, melamine as a nitrogen source, and K2CO3 as a green activator to prepare nitrogen-doped porous cork activated carbon (NCAC) with a honeycomb structure. The results showed that NCAC-900, activated at 900 degrees C, exhibited a highly porous structure with an optimal specific surface area of 2051.35 m2/g and a pore volume of 1.18 cm3/g. To evaluate its adsorption performance towards rhodamine B (RhB), collaborative activation and post-treatment were employed to enhance the adsorption capacity of the dyes. NCAC-900 demonstrated excellent removal efficiency, with a theoretical maximum adsorption capacity of 2552.52 mg/g (at an adsorbent dosage of 0.2 g/L) in a 300 mg/L solution. Nitrogen doping effectively improved the adsorption capacity for RhB, fitting well to the quasi-secondary kinetic model (R2 = 0.9973-0.9999) and Langmuir isotherm (R2 = 0.7697-0.9523) for the adsorption kinetics and equilibrium data. A comparison with the existing literature also revealed that NCAC-900 possessed a remarkably fast adsorption rate of 12.82 mg/g/ min. Moreover, the resorption efficiency of NCAC-900 for RhB reached approximately 66.78% after five consecutive adsorption-desorption cycles. Additionally, the obtained nitrogen-doped cork activated carbon exhibited impressive adsorption capabilities of anionic dye Congo red (CR, qm=1499.14 mg/g) and cationic dye methylene blue (MB, qm=571.54 mg/g). In conclusion, our work presented a promising method for preparing excellent NCAC as an efficient adsorbent for wastewater dyes, offering new ideas and theoretical foundations for the high-value utilization of cork materials and the development of cork activated carbon.

Formaldehyde (HCHO) poses a significant threat as a common indoor air pollutant, leading to various health issues. However, effectively addressing HCHO removal at room temperature remains a considerable challenge. This paper presents the preparation of a robust, eco-friendly, and biodegradable composite cellulose nanofiber film, incorporating CeO2-Ag@MnO2 catalysts and TEMPO-oxidized cellulose nanofiber (TOCNF), for high-efficiency HCHO removal at room temperature. A CeO2-Ag@MnO2 ternary catalyst with a core-shell structure was constructed to enhance the catalytic oxidation activity and stability. This structure increased the number of active sites on the catalyst surface and enhanced the interfacial synergistic effect of Ce-Ag-Mn. The TOCNF physically adsorbed HCHO in the composite film, while the catalyst oxidized it to CO2 and water. The composite films, particularly those with 20 wt% CeO2-Ag@MnO2 catalyst, exhibited high HCHO removal rates of 91.2 % at 20 °C and 99.6 % at 60 °C. Furthermore, the TOCNF/20 CAM composite films demonstrated excellent mechanical properties and degradability. This composite film offers an efficient and eco-friendly solution for the catalytic oxidation of HCHO at room temperature.

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 TiO2 and SiO2 combined with polyvinyl alcohol (PVA), where the amount of TiO2 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 SiO2 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.

Wrinkled surfaces exist widely in nature and organic living world, such as plants, insects, and skin. The optical, wettability and mechanical properties of materials can be enhanced by artificially preparing regular microstructure on the surface of materials. In this study, a novel self-wrinkled polyurethane-acrylate (PUA) wood coating with self-matting, anti-fingerprint performance and skin-tactile feeling curing by excimer lamp (EX) and ultraviolet (UV) was prepared. The wrinkles were formed on the surface of PUA coating at microscopic level after excimer and UV mercury lamp irradiation. The width and height of the wrinkles on the coating surface can be controlled to adjust the coating performance by changing the curing energy. When the PUA coating samples were cured by excimer lamp and UV mercury lamp with curing energy of 25-40 mJ cm-2 and 250-350 mJ cm-2, the excellent coating performances were observed. The gloss value of self-wrinkled PUA coating at 20° and 60° were less than 3 GU, while at 85° was 6.5 GU, which satisfied the demanding of matting coating. Besides, the fingerprints on the coating samples could disappear in 30 s and could still have anti-fingerprint performance after 150 times of anti-fingerprint tests. Furthermore, the pencil hardness, abrasion quantity and adhesion of self-wrinkled PUA coating were 3H, 0.045 g and 0 grade respectively. Finally, the self-wrinkled PUA coating has excellent skin-tactile feeling for touching. The coating can be applied to wood substrates, and has potential application in the field of wood-based panels, furniture and leather.

The loading of catalytic manganese dioxide (MnO2) nanoparticles onto an impregnated decorative paper has been an effective method for the removal of indoor formaldehyde (HCHO) pollutants. However, its preparation can present numerous challenges, including instability in dipping emulsions and leaching. In this investigation, a novel and stable formaldehyde-free polyacrylate dipping emulsion containing MnO2 particles was prepared and then back-coated on a decorative paper. To improve the dispersion and fixation, the MnO2 was modified with silane. HCHO can undergo physical adsorption on the cellulosic fibers present in the paper, while it can also undergo chemical degradation into CO2 within the MnO2 groups. The silane not only enhanced the interfacial adhesion to a polyacrylate resin but also increased the interlayer distance, thereby creating a larger space for HCHO absorption. The impregnated decorative paper back-coated with 10 wt % of silane-modified MnO2 exhibited a removal efficiency of approximately 90% for HCHO at 20 °C. The removal rate further improved to approximately 100% when the temperature was increased to 60 °C. Moreover, it is worth noting that the release of volatile organic compounds was exceptionally minimal. Additionally, the particleboard bonded with this impregnated decorative paper exhibited an extremely low emission of HCHO, with a value that approached 0 mg·L-1. Furthermore, the bonding strength of the surface remained unaffected. Therefore, this study provides a simple and eco-friendly method for effectively removing HCHO, which can enhance indoor air quality.

A durable and environmentally-friendly superhydrophobic coatings for liquid-food residue reduction were prepared by using stearic acid (SA) modified organic montmorillonite (SA@OMMT) and poly(dimethylsiloxane) (PDMS). Due to the natural hydrophobicity of SAs, SA@OMMT provides low surface energy as well as roughness for the coating. PDMS not only provided low sur -face energy in the coating but also contributed to the bonding of SA@OMMT as a result of its high adhesive properties. In addition, PDMS has good physical properties after curing, which can effectively improve the physical properties and durability of a superhydrophobic coating by the self-assembly method using a PDMS/n-hexane solution. For 1 wt.% SA@OMMT and 5 wt.% PDMS, the resulting SA@OMMT/PDMS (SOP) coating showed the water contact angle (WCA) and water sliding angle (WSA) of 156.3 degrees and 2 degrees, respectively. The prepared coatings have good physical and chemical stability, and they still have superhydrophobicity after physical abrasion tests and exposure to the cor-rosion solutions. In the meanwhile, the prepared coating also has flexibility and superhydrophobicity after bending and folding. Finally, the coating sur -face shows highly effective antifouling ability to liquid and solid pollutants. The coating can be applied against different substrates and has potential appli-cation in the field of liquid-food residue reduction.

With the growing concern for environmental protection and personal health, utilizing bio-based impregnated resin has become a sustainable approach for producing aldehyde-free decorative paper and in-house decorations. Our current work focuses on the preparation of an aldehyde-free resin (AFR) by formulating quaternized cellulose nanofibrils (QCNFs, Ave. width 10 ± 3 nm, Ave. length of and >500 nm) with aqueous acrylate emulsion. We analyzed the synthesized QCNFs, acrylate emulsion, and AFR by using various methods, including FTIR, XPS, XRD, TGA/DTG, and rheometer, to evaluate their applicability for impregnated paper processing. At a low coating weight of 4.0 g/m2, a 30.8% increase and 4.9-times increase in tensile strength and contact angle were detected, respectively. Meanwhile, the free aldehyde emission from the AFR-coated paper was found to be 0.1 mg/L even at a high coating weight of 18.8 g/m2, which is far below the E0 level requirement in the JAS 234:2003 criteria. Therefore, the surface coating of the decorative base paper was found to be competitive in covering the porous structure of the paper, reinforcing its mechanical strength, and providing high water resistance. Moreover, the lower free aldehyde emission from the AFR-coated paper ensures its safety and potential application in house decoration products.

针对近期发表的绿色环保型超疏水涂层相关研究进行总结,从绿色环保型超疏水涂层的制备方法、研究进展和应用领域 3 个方面进行了综述.介绍了现阶段绿色环保超疏水涂层的制备原理和制备方法,简要概述了通过涂覆法、模板法、刻蚀法、静电纺丝法等制备方法的代表性应用研究,并分析了各自的优点以及目前存在的问题.着重介绍了天然蜡类、脂肪酸类、纤维素类和生物质类绿色环保型超疏水涂层的相关最新进展和制备方法,对不同种类的环保疏水涂层的优劣势进行了详细的分析.最后,对目前绿色环保超疏水涂层在自清洁、防腐以及油水分离涂层领域的应用进行了总结,针对目前绿色环保型超疏水涂层应用中所存在的问题提出了进一步研究的建议,并对未来的发展趋势进行了展望.

筛选了A、B两种聚氨酯丙烯酸酯UV固化涂料,将其涂饰在浸渍胶膜纸饰面刨花板表面,采用绝氧保护准分子灯预固化,制备了具有肤感的浸渍胶膜纸饰面刨花板,并对其表面形貌以及表面性能进行了研究.结果表明,经绝氧保护准分子灯预固化处理后,2种涂料涂饰浸渍胶膜纸饰面刨花板表面均能够产生褶皱、波纹的特征结构,具有细腻的肤感效果.此外,这种褶皱和波纹特征能实现光的全散射,赋予了饰面刨花板抗指纹功能.相比A涂料,B涂料的触感较好,光泽度较低,达到超哑光(60°测试条件下<5°),抗指纹性能较优,在手指接触后13 s左右指纹可消失.同时,B涂料制备的涂饰浸渍胶膜纸饰面刨花板表面性能良好,可以用于室内木质门、饰面木质墙板等立面产品.

多酚-铁络合的木材化学调色技术具有低碳、绿色、环保等特点,被列入"十三五"国家重点研发计划项目予以资助,取得了一系列的成果.本文从多酚-铁络合木材化学调色的机理、工艺、技术、新产品等方面梳理了多酚-铁络合木材调色技术的研究进展,分析木材多酚-铁络合在改变木材颜色、减少木材色差、增强木材纹理感、提高木材色牢度等方面的应用前景,剖析木材化学调色面临的机遇与挑战,以期为木材多酚化学调色技术的研究、推广和应用提供参考.

纸基饰面材料是人造板常用的表面装饰材料,不仅赋予人造板表面图案和花色,还具有一定的保护作用.本文对不同纸基饰面材料的发展概况、分类、特性和应用进行了概述,并介绍纸基饰面材料新技术.