Effect of High-Temperature Calcined Wheat Straw Powder after Lignin Removal on Properties of Waterborne Wood Coatings

Yan, Xiaoxing; Wang, Lin; Qian, Xingyu

doi:10.3390/coatings9070444

Cited by 10 publications

(11 citation statements)

References 32 publications

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“…Adding thermochromic ink to waterborne wood coatings can change the color of waterborne coatings with the change of temperature, make the product display different colors with the change of season, and make the product more humanized and changeable. The waterborne wood coating is environmentally friendly because it does not increase VOC emissions [15,16], and it is superior to oil-based paint in environmental sustainability and performance stability [17,18]. Microencapsulation is needed to keep the entire thermochromic system together and protect it from the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

2019

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Wood surface decoration and protection has become a topic of public concern. In this paper, a temperature-sensitive and reversible thermochromic waterborne wood coating was prepared by using Chinese fir board as the base material and a waterborne wood coating with the pigment slurry of thermochromic microcapsules as the paint base. The optical properties, mechanical properties and chemical resistance of the waterborne wood coating were tested, and its microstructure was analyzed. The results showed that when the concentration of thermochromic pigment slurry was 30.0%, the thermochromic property of the waterborne wood coating was best. The gloss of the waterborne wood coating with 15.0% pigment slurry of thermochromic microcapsules was high. The concentration of thermochromic pigment slurry had no effect on the adhesion, impact resistance, or chemical resistance of the waterborne wood coating. Based on the above results, the waterborne wood coating on Chinese fir had the best comprehensive performance when the concentration of thermochromic pigment slurry was 15.0%. This work will provide a technical reference for the industrialization of the thermochromic coating film on wood.

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Section: Introductionmentioning

confidence: 99%

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

2019

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“…The band at 1732 cm −1 is the C=O group with strong and sharp characteristics, which may be aldehyde or ketone. It can be seen from Figure 4 that there were absorption peaks representing C=C-H near 810 cm −1 , and the C-O stretching vibration band and the C-C skeleton stretching vibration absorption at 1150 cm −1 [24]. When the pigment powder was added to the primer, all peaks were not disappeared apart from -OH group, which basically did not affect the discoloration effect of the pigment powder, and still had the discoloration ability.…”

Section: The Fourier Transform Infrared Spectroscopy (Ftir) Analysis mentioning

confidence: 96%

Influence of Thermochromic Pigment Powder on Properties of Waterborne Primer Film for Chinese Fir

2019

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This study chose organic thermochromic pigment powder and waterborne wood primer as the paint base, and Chinese fir board as the substrate to prepare thermochromic waterborne coatings with different concentrations of thermochromic pigment powder. The best concentration of thermochromic pigment powder for waterborne primer film on Chinese fir surface was explored. The experimental results showed that the color-changing property of the primer film was the best when the concentration of pigment powder in primer film was 5.0%–10%. There was a negative correlation between the gloss of the primer and the concentration of pigment powder. The gloss of the primer film was the highest when the concentration of pigment powder was 5%. When the concentration of pigment powder is 0%–20% and 25.0%–30%, the adhesion of the coating is grade 0 and grade 1, respectively. The resistance to the impact of primer film increased with the increase of concentration of pigment powder, but the resistance to the impact of primer film with 0%–30% of thermochromic pigment powder concentration was similar. Scanning electron microscopy showed that the higher the concentration of thermochromic pigment powder, the more particles and agglomeration. When the concentration of pigment powder was 5%, the distribution of particles was uniform and no agglomeration, and the microstructure of primer film was the best. Infrared spectroscopy showed that there was no difference in the composition of the paint film from 0% to 30%. The results showed that the comprehensive property of waterborne primer film on Chinese fir was better when the pigment concentration was 5%. Waterborne thermochromic primer film provides a potential application for the development of intelligent furniture in different temperature ranges.

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“…Huang et al [49,50] found that the reduced elastic modulus of bamboo fiber cell walls in the transverse direction was 5.91 GPa, and in the longitudinal direction, was 17.6 GPa, and the hardness was 0.37 GPa. The samples were embedded in epoxy resin, which might result in undesirable chemical modifications caused by epoxy impregnation [50,51]. Therefore, the influence of epoxy resin, the interface between the fiber and resin, and the microfibril angle of the fiber on the nanomechanical properties of PCF will be evaluated in future work.…”

Section: In Situ Nanoindentationmentioning

confidence: 99%

The Microstructure and Mechanical Properties of Poplar Catkin Fibers Evaluated by Atomic Force Microscope (AFM) and Nanoindentation

Shi

et al. 2019

Forests

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In this study, the microstructure and mechanical properties of poplar (Populus tomentosa) catkin fibers (PCFs) were investigated using field emission scanning electron microscope, atomic force microscopy (AFM), X-ray diffraction, and nanoindentation methods. Experimental results indicated that PCFs had a thin-wall cell structure with a large cell lumen and the hollow part of the cell wall took up 80 percent of the whole cell wall. The average diameters of the fiber and cell lumen, and the cell wall thickness were 5.2, 4.2, and 0.5 µm, respectively. The crystallinity of fibers was 32%. The AFM images showed that the orientation of microfibrils in cell walls was irregular and their average diameters were almost between 20.6-20.8 nm after being treated with 2 and 5 wt.% potassium hydroxide (KOH), respectively. According to the test of nanoindentation, the average longitudinal-reduced elastic modulus of the PCF S 2 layer was 5.28 GPa and the hardness was 0.25 GPa.Poplar (Populus tomentosa) catkin fiber (PCF) is a cotton-like catkin fiber covering the seeds of white poplar trees [7]. Poplar is a kind of fast-growing tree species with a short growth cycle and low price. It is mainly concentrated in the northeast, north China, and northwest areas. The total area of poplar forest in China exceeds 70,000 km 2 , and it increases year by year. Each poplar tree can harvest about 25 kg of catkins. The tassel fiber is mainly composed of cellulose and hemicellulose, as well as lignin, with a thin cell wall and large lumen [8]. During the period from April to June each year, PCFs float in the air, causing great trouble for the environment and residents' health. Zhang et al. [9] focused on poplar (Populus tomentosa) catkin fiber as a new resource for bioethanol production via enzymatic hydrolysis. Yin et al.[10] studied the water absorption and oil absorption of poplar catkins. They studied how to inhibit the production of PCFs, but not how to utilize them. There are few studies on the microstructure and mechanical properties of PCFs.In recent years, microscopic imaging and spectral characterization methods have been used in nanostructure and chemical composition analyses of cell walls of plant fibers like wood fibers [11][12][13][14][15][16], bamboo fibers [17][18][19][20][21][22], and cotton fibers [23,24]. Chen et al. [25] characterized the aggregation of microfibrils in the cross-section of thin-wall cells using the atomic force microscopy (AFM) technique. Xiao et al. [26] and Hao et al. [24] investigated the cell wall layer structure of kapok fibers using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) through formulating an efficient organic solvent system to isolate cellulose from lignin and concluded that both kapok and cotton fibers had similar multi-wall layer structures. Fernandes et al. [27] investigated the nanostructures of spruce fibers using a series of spectroscopic techniques, such as small angle neutron ray scanning (SANS) and wide-angle X-ray scattering (WAXS).Oliver and Pharr.[28]...

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Effect of High-Temperature Calcined Wheat Straw Powder after Lignin Removal on Properties of Waterborne Wood Coatings

Cited by 10 publications

References 32 publications

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

Effect of the Concentration of Pigment Slurry on the Film Performances of Waterborne Wood Coatings

Influence of Thermochromic Pigment Powder on Properties of Waterborne Primer Film for Chinese Fir

The Microstructure and Mechanical Properties of Poplar Catkin Fibers Evaluated by Atomic Force Microscope (AFM) and Nanoindentation

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