Promotion by copper (II)-modified montmorillonite of the drying property of oriental lacquer sap

Yang, Jianhong; Zhu, Jianfeng; Shen, Fengqin; Zhou, Ming

doi:10.1016/j.porgcoat.2018.01.023

Cited by 22 publications

(16 citation statements)

References 36 publications

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“…The stability of these emulsions was observed at room temperature. After they were applied on a glass with a thickness of 50 μm, their drying properties were measured using an automatic drying time tester according to the method in the literature 35 .…”

Section: Preparation Of Various Urushiol/h 2 O Emulsions and Their Prmentioning

confidence: 99%

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Polymerization mechanism of natural lacquer sap with special phase structure

Yang

Chen

Zhu

et al. 2020

Sci Rep

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Lacquer sap is a water-in-oil natural emulsion with high viscosity. in nature, it exudes from the phloem of lacquer tree to repair its wounds in the presence of o 2. So far, it is unclear how rapid and smooth polymerization of urushiol is achieved in such a viscous sap. Here, we find that there is a diffuse interface layer with 2.43 nm of thickness between two phases. The interface layer consists of urushiol, urushiol-laccase complex, urushiol-stellacyanin complex and water-insoluble glycoprotein. Polymerization of urushiol is realized by multicomponent synergistic effect. Radicals are first formed by laccase-catalyzed oxidation of urushiol at the interface layer, then are transferred to the urushiol oil phase via wate-insoluble glycoprotein and initiate the polymerization of urushiol there. Stellacyanin inhibits the formation of certain radicals and controls the concentration of phenoxy radicals at the interface layer. Through the inhibition of radicals by stellacyanin and the electron transfer mediated by water-insoluble glycoprotein, the polymerization of urushiol at the interface layer is inhibited. This ensures that o 2 can continuously penetrate into the aqueous phase to oxidize the reduced laccase so that the urushiol polymerization can continue smoothly. this polymerization mechanism provides an idea for developing new chemical reaction systems.

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Section: Preparation Of Various Urushiol/h 2 O Emulsions and Their Prmentioning

confidence: 99%

“…1 H NMR spectra were recorded on a Bruker AVANCE III 400 MHz NMR spectrometer (Germany). Samples were prepared according to the method in the literature 35 . In the drying process, samples were taken out and extracted with THF.…”

Section: Scientific Reports |mentioning

confidence: 99%

Polymerization mechanism of natural lacquer sap with special phase structure

Yang

Chen

Zhu

et al. 2020

Sci Rep

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“…Gao et al found that the presence of hexamethylenetetramine (HMTA) in RL had a positive influence on the performances of lacquer films as it improved the morphology, luster, distinctness of image (DOI), hardness, thermal stability and alkali resistance of the coating membranes [ 8 ]. Yang et al incorporated copper (II)-modified montmorillonite (Cu (II)-MMT) with RL, thereby considerably shortening the drying time of resulting membranes in low humidity while improving the gloss and thermal stability of the membranes [ 9 ]. Xu et al used a water-assisted assembly method to produce urushiol-formaldehyde polymer (UFP) membranes that had a porous structure—and thus good hydrophobic properties and acid and alkali resistance [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Improvement of Using Raw Lacquer and Electrospinning on Properties of PVP Nanofilms

Zhang

Liu

et al. 2020

Nanomaterials

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Raw lacquer (RL), ethanol being used as the solvent, was added to polyvinyl pyrrolidone (PVP) and then electrospun into RL/PVP nanofilms. Manufacturing parameters such as RL/PVP ratio, voltage, flow velocity, needle type, and the distance between syringe and the collection board were systematically investigated. A scanning electronic microscope (SEM) was used to observe the surface morphology of nanofilms; the block drop method was used to measure the water contact angle; the mechanical properties of RL/PVP nanofilms of different proportions were tested by universal material testing machine; and Fourier-transform infrared spectroscopy (FT-IR) was used to characterize the structure. Based on the water resistance and acid resistance measurements, the proposed nanofilms demonstrated to be water and acid resistant were successfully produced. The results show that PVP that melts in water becomes incompatible with water after adding raw lacquer, and the acid resistance is greatly improved. Furthermore, the smaller the fiber diameter, the better the mechanical properties of the nanofilms are under low ratio of RL/PVP. With a high proportion of RL/PVP, the inner structure of the nanofilm is denser, and the water resistance and acid resistance are better. The dense structure can protect the inner material of the nanofilms.

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“…For example, raw lacquer is extremely inflammable, highly viscous, and demands a long curing time. Additionally, it lacks ease of processing and alkali resistance, and these disadvantages restrict its industrial application to a considerable extent, especially the inflammable attribute, which is a hidden danger to the occurrence of Polymers 2021, 13, 2858 2 of 16 fire. Therefore, raw lacquer needs to be reinforced with combustion resistance in order to reduce the loss of the finance and ensuring the public safety, which is significant to broaden the use of raw lacquer.…”

Section: Introductionmentioning

confidence: 99%

“…Xia et al employed UV lights to solidify raw lacquer films and successfully shortened the curing time [12]. Yang et al used copper modified montmorillonite (Cu(II)-MMT) as the highly efficient catalysis and proved that it could accelerate the curing time of urushiol, improving the luster and thermal stability concurrently [13]. Gao et al modified raw lacquer with hexamethylenetetramine (HMTA), during the thermal curing condition HMTA was dissociated into amine and formaldehyde, the latter of which underwent the condensation reaction along with urushiol [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Compound Phosphorus-Nitrogen Intumescent Flame Retardant for Applications to Raw Lacquer

Shiu

Lou

et al. 2021

Polymers

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Raw lacquer (RL) is a natural polymer compound with highly promising applications; however, its inflammable attribute restricts the industrial applications. In this study, melamine is used to formulate tri (1-melamine-2-propanol) phosphate (FR-1), after which it is synthesized with ammonium phosphate (FR-2) and diatomite to form a compound phosphorus-nitrogen intumescent flame retardant (IFR). Next, IFR is used as the filling agent that then cross-links with RL, and as such RL/IFR membranes are formed after the curing. The limiting oxygen index (LOI) measurement, the vertical combustion test (UL-94), the microshape calorimetric analysis (CCT), and the thermal gravimetric analysis (TGA) are conducted to examine the combustion resistance and thermal stability of the membranes. Fourier transform infrared spectroscopy (FT-IR) and electron scanning microscope (SEM) are performed to separately characterize the structure and compatibility; the mechanical properties of the membranes are also evaluated. The vertical combustion test results confirm that with 30 wt% of IFR, RL/IFR membranes acquire 12.3% higher LOI and a vertically combustion of V-0 level. The TGA indicates that RL/IFR membranes demonstrate a greater adhesion level, a higher rigidity, and better luster than pure RL membranes.

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Promotion by copper (II)-modified montmorillonite of the drying property of oriental lacquer sap

Cited by 22 publications

References 36 publications

Polymerization mechanism of natural lacquer sap with special phase structure

Polymerization mechanism of natural lacquer sap with special phase structure

A Study on the Improvement of Using Raw Lacquer and Electrospinning on Properties of PVP Nanofilms

Synthesis of a Compound Phosphorus-Nitrogen Intumescent Flame Retardant for Applications to Raw Lacquer

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