APPLIED CLAY SCIENCE
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2020
·
IF 4.605
Zhengmao Ding,Jie Li,Wei Xin,Yunjun Luo
A large-scale exfoliation method to obtain high-quality and mono-layered montmorillonite (Mt) nanosheets via the aggregation of polyethyl-phosphate glycol ester (Exolit OP 550) was proposed. Small-angle X-ray diffraction (XRD), transmission electron microscope (TEM), selected area electron diffraction (SAED), and atomic force microscopy (AFM) examinations indicated that 30.0 wt.% of layered Mt. were exfoliated into mono-layered nanosheets in Exolit OP 550 after a mechanical stirring process at 60 °C for 12 h. This exfoliation concentration was increased by 67–650% compared with that of other works. The Mt. nanosheets with Exolit OP 550 were then assembled into environment-friendly waterborne polyurethane (OPWPU) coating by in situ polymerization. A significant decrease of 60° gloss, from 30.2 GU to 0.3 GU, was observed. Many large, uniform, and continuous spherical particles on the surface of OPWPU nanocoatings were found by scanning electron microscopy (SEM), which resulted in a rough surface that almost completely diffused incident light. Besides, limiting oxygen index (LOI), cone calorimeter testing (CCT), and SEM results suggested that the OPWPU nanocomposites also had improved fire retardancy, especially the peak heat release rate was decreased by a maximum of 39.2%. This study may open up new possibilities for the application of Mt. nanosheets in polymers.
研究领域:
材料科学
·
纳米技术
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 2
·326
·
IF 3.426
Qiwen Yong,Jinming Chang,Qi Liu,Feng Jiang,Daidong Wei,Haijun Li
Matt polyurethane coating was successfully prepared through the synergistic effect of castor oil and phenolic epoxy resin into polyurethane backbone. The formation mechanism may be ascribed to the modulus mismatch between the partially modified epoxy polyurethane and partially unmodified polyurethane. Scanning electron microscopy (SEM) was used to observe the micro-rough surface morphologies. Atomic force microscopy (AFM) and three-dimensional (3D) surface profilometer were applied to calculate a series of surface roughness parameters in different dimensions, such asSa,Sq,Sp,Sv,Sz,Sku,Ssk, etc. The exciting results of this paper—the correlation of surface roughness on measurement length and gloss—are explored in detail. It reveals the extrinsic property of measured roughness with measurement length and provides guidance for what kind of incident angle gloss meters (20°, 60°, and 85°) best describe the gloss of matt polyurethane coating.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
Coatings
·
2017
·Vol. 8
·期 1
·9
·
IF 2.175
Xiaoxing Yan,Xingyu Qian,Rong Lu,Tetsuo Miyakoshi
A waterborne ultraviolet (UV)-curing coating was prepared on the surface of wood materials with modification of talcum powder and calcium carbonate (CaCO3). When the waterborne UV-curing coatings on the surface of wood materials (WUVCW) was radiated for 1 min by UV (λ = 365 nm) and dried at 40 °C for 10 min, it showed good hardness, adhesion, and impact strength, with controlling the talcum content of 2.0% and CaCO3content of 1.0%, respectively. When the content of talcum powder was higher than 2%, the mechanical properties and gloss of the WUVCW decreased, and when the talcum powder of WUVCW increase to more than 5%, a matte surface appeared after curing. When CaCO3and talcum powder were present at the same time, the mechanical properties of WUVCW were better than those of only CaCO3or talcum powder.Keywords:modification;interior waterborne coating;UV;mechanical properties;gloss
研究领域:
材料科学
·
木材科学与技术
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Construction Materials
·
2022
·
IF 4.934
Yun Shen,Jing Lu,Changcai Cui
The grinding and polishing of curved stone involve many steps, limiting the process's efficiency. This study proposes a one-step grinding and polishing process to simplify the process and achieve efficient machining. It is achieved by developing the grinding and polishing tools and realizing the entire process on the robotic processing platform, and the tool design is based on the surface roughness of the machined workpiece. The grinding tool is made by selecting the appropriate glue to achieve the connection from carving to polishing. Similarly, the polishing tool is made by selecting the appropriate gel compound system to achieve a high glossiness curved stone surface. The results show that the grinding tool made of epoxy resin YT-CC301 can reduce the curved stone's roughness from 16.281 µm to below 400 nm, and the connection from carving to polishing can be realized by one step. The polishing tool made of sodium alginate and carboxylated chitosan gel compound system or sodium alginate and sodium carboxymethyl cellulose gel compound system can polish the surface of the ground curved stone to the roughness of less than 15 nm, and the surface glossiness can reach more than 120. Therefore, a single step of grinding and polishing of curved stone is achieved.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 44
·27620-27626
·
IF 3.361
Zhixian Lin,Zhe Sun,Chengping Xu,Aiqin Zhang,Jun Xiang,Haojun Fan
Due to the paradox between abrasion-resistance and extinction, the development of a self-matting waterborne polyurethane (SMWPU) coating accompanied by excellent abrasion-resistance is still a challenge. Herein, a kind of hydroxyalkyl-terminated polysiloxane modified SMWPU was prepared and employed for matting leather/synthetic leather finishing. Simultaneously, the influences of hydrophilic chain extender and polysiloxane loadings on the matting effect and abrasion resistance of the coating were investigated in detail. The results indicated that the gloss of the coating was closely related to the hydrophilic chain extender content, and a stable emulsion and optimal matting effect could be achieved when a 1.6 wt% (based on solid content) hydrophilic chain extender was employed. With the introduction of polysiloxane, the silicon element content on the coating surface increased from 0% to 9.26%, just as expected, and an enhanced abrasion resistance of the coating was obtained. Specifically, the coating weight loss ratio was reduced from 2.36 wt% to 0.41 wt%, and obvious surface damage did not occur after 500 abrasions. Although the surface roughness and matting effect of the coating decreased slightly due to the introduction of silicone, the gloss of the modified coating was less than 1.5° (60° incidence angle), still exhibiting an excellent matting effect. Another interesting result was the elevation of anti-hot-pressing, compared with that of the unmodified one, and the gloss of the modified coating showed no changes under a 10 MPa, 150 °C hot-pressing condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Bao Zhang,Tao Zou,Meng Wang,Weichen Pan,Junfeng Yang,Xiaohong Peng
Self-matting waterborne polyurethane (WPU) with rough surface is often accompanied by poor antibacterial property, which greatly limits its service life. Here, a gemini quaternary ammonium (GQM) with hydrophilic and antimicrobial properties was designed and synthesized. 1,3,5-tris (2-hydroxyethyl) hexahydro-1,3,5-Triazine (TNO) was used as a crosslinking agent, and GQM was selected as chain extender to prepare antibacterial and self-matting WPU resin. The effects of TNO and GQM on the morphology, particle size, gloss, antibacterial rate, and hydrophilicity of WPU were investigated. The results showed that the introduction of TNO and GQM significantly enhanced the self-matting effect and antibacterial activity of WPU. When the contents of TNO and GQM were 1.2 wt % and 4 wt %, the average particle size of emulsion was 6.53 μm, the gloss of coating was 11.05 GU. It is also significant to be noted that the antibacterial rates of S. aureus and E. coli were 95.69 % and 95.18 %, respectively. This prepared WPU was endowed with self-matting and antibacterial properties simultaneously. This finding can provide a novel insight into the research of antibacterial polymers and antiglare coatings.
研究领域:
材料科学
·
高分子化学
·
抗菌材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ziyong Zhou,Jun Xu,Junliang Lu,Jun Li,Wei Zhang,Kefu Chen
The functional chemicals in conventional personal care products may have negative effects on both human body and the environment, and natural proteins are gaining increasing attention as alternatives to functional chemical. However, due to the poor absorption of proteins on the surface of the hair, it cannot perform their function well. In this study, a protein-based multifunctional complexes, made of keratin and cationic cellulose nanocrystals by opposite charged-induction, were prepared for improving the glossiness and reducing hair thermal-photo damage. By changing the ratio of keratin and cationic cellulose nanocrystals in complexes, the optical properties and oil delivery property were studied. It was found that the protein-based complexes could improve the glossiness of substrate and have synergistic reducing UV transmittance, especially UVB. Besides, the complexes with high ratio of C-CNC were beneficial for the deposition of silicone oil onto hair. And after treated with the complexes or the resulting emulsion, the water evaporation of hair during heat treatment and the hair damage during light radiation were effectively reduced to improve the thermal-photo protection for hair. This study was expected to provide new design for improving adsorption of protein on the substrate and developing protein multifunctional application in personal care.
研究领域:
材料科学
·
化妆品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Ming Liu,Guoqiang Shao,Pengpeng Lv,Jun Li,Qingshan Zhu
The fluidization quality significantly affects the mass transfer and the deposition reaction, which determine the uniformity of deposited TiO 2 thin films on fluorophlogopite particles. It was found that the effective addition ratio of nano-TiO 2 particles is above 0.2 wt% to realize fluidization of fluorophlogopite particles. The addition of nano-TiO 2 particles leads to competitive deposition between free TiO 2 particles and fluorophlogopite particles, which decreased the coating rate of TiO 2 on fluorophlogopite particle. Besides, the existence of free TiO 2 particles on pearlescent pigment particles decreases the glossiness. The gas-solid ratio primarily determines the number of the free TiO 2 particles on pearlescent pigment particles. It was summarized that the optimal value of addition ratio of nano-TiO 2 is 0.4 wt% with the gas-solid ratio of ∼0.05 m 3 kg −1 h −1 to enhance the fluidization quality on the one hand, and to reduce the free TiO 2 particles on the other hand.
研究领域:
化学工程
·
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）