Three sources-in-one bio-MOFs doped silicone acrylic emulsion-based waterborne flame-retarding coatings with formaldehyde adsorption property

Wang, Yachao; Kou, Xiaofei; Zhao, JiangPing; Xin, Aiyuan

doi:10.1016/j.porgcoat.2022.107329

Cited by 6 publications

(5 citation statements)

References 57 publications

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“…The diffraction peak of DAL disappears at 21.48°(compared with LS), and slight diffraction peaks appear 34,35 Due to the cross-linking of the organic structure, the broadened diffraction peak at 21.48°r eplaces the small peak, which indicates that the obtained DAL has a smaller grain size. 36 Additionally, the amorphous area of DAL (Area = 26 924) showed noticeable shrinkage compared to LS (Area = 28 709) in Figure 4. The mechanical mixing of DOPO and LS promotes the activation and formation of DAL.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…The diffraction peak of DAL disappears at 21.48° (compared with LS), and slight diffraction peaks appear at 22.42 and 37.02°. Moreover, the intensity of the diffraction peaks at 25.42 and 31.78° is significantly reduced, indicating that the structure of the newly formed substance has changed compared with the original LS. , Due to the cross-linking of the organic structure, the broadened diffraction peak at 21.48° replaces the small peak, which indicates that the obtained DAL has a smaller grain size . Additionally, the amorphous area of DAL (Area = 26 924) showed noticeable shrinkage compared to LS (Area = 28 709) in Figure .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterization of Sodium Lignosulfonate-Based Phosphorus-Containing Intermediates and Its Composite Si–P–C Silicone-Acrylic Emulsion Coating for Flame-Retardant Plywood

Lai,

Wang,

et al. 2024

Langmuir

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Through the substitution reaction between 9,10dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and sodium lignosulfonate (LS), a novel phosphorus-containing sodium lignosulfonate (DAL) was successfully synthesized via the solvothermal method and used as a multifunctional flame retardant to prepare a novel silicone-acrylic emulsion (SAE) composite Si− P−C coating. The structure of DAL was determined by X-ray diffraction (XRD), attenuated total reflection infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and nuclear magnetic resonance (solid-state 13 C NMR and 31 P NMR). The results demonstrated that incorporating an appropriate dosage of DAL (0.9 g, 1.5 wt %) into SAE-based composite coatings enhances flame retardancy and reduces heat release and smoke production during burning. The peak heat release rate (p-HRR) decreases from 236.7 to 120.3 kW•m −2 , total smoke production (TSP) decreases by 71.1%, and the flame-retardant index increases from 1.00 to 4.58. Meanwhile, the coating is transformed into a dense and nonflammable vitreous polyphosphate barrier layer during the firing process to prevent heat or mass transfer. Furthermore, the pyrolysis kinetics identify that the 3D Z−L−T model governs the coatings' pyrolysis, and the appropriate DAL makes the pyrolysis E α climb from 300.98 to 331.30 kJ•mol −1 at 358−439 °C. Hence, this study presents a new synthesis method of multifunctional flame retardant DAL, studies the excellent properties and cross-linking mechanism of DAL-doped SAEcomposite Si−P−C coatings, and explores a halogen-free, low-carbon, and clean eco-technology strategy.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Sodium Lignosulfonate-Based Phosphorus-Containing Intermediates and Its Composite Si–P–C Silicone-Acrylic Emulsion Coating for Flame-Retardant Plywood

Lai,

Wang,

et al. 2024

Langmuir

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“…The characteristic peak at 1000 cm −1 is attributed to the asymmetric telescopic vibration of C-C. The peak at 1450 cm −1 is assigned to -OH group bending vibrations because water is present in the acrylic acid [36]. This result indicates that the introduction of sodium silicate and MCA is without altering the chemical structure of acrylic acid.…”

Section: Characterization Of Flame-retardant Coatingsmentioning

confidence: 94%

A Novel Intumescent MCA-Modified Sodium Silicate/Acrylic Flame-Retardant Coating to Improve the Flame Retardancy of Wood

Wang,

Ran,

Shao

et al. 2024

Molecules

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The incompatibility between inorganic flame retardants and organic acrylic coatings represents a significant challenge that requires resolution. This work selected environmentally friendly organic aqueous acrylic coatings as the substrate, sodium silicate hydrate as the inorganic flame retardant, and melamine cyanurate (MCA) as the flame-retardant modifier and the flame-retardant co-modifier, with the objective of improving the dispersion and flame-retardant properties of sodium silicate hydrate in the aqueous acrylic coatings. Subsequently, the sodium silicate/MCA/waterborne acrylic acid flame-retardant coating was prepared. The flame-retardant treatment was then applied to poplar veneer in order to create a flame-retardant poplar veneer. The dispersion of the flame-retardant coating was characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX), and X-ray diffractometry (XRD). Furthermore, the flame-retardant properties of the flame-retardant poplar veneer were analyzed by thermogravimetry (TG), limiting oxygen index (LOI), and cone calorimeter. The results demonstrated that the MCA-modified sodium silicate flame retardant was well dispersed in aqueous acrylic coatings. The results of the flame-retardant properties of the poplar veneer indicated that the ignition time of the 9% flame retardant-treated poplar veneer was increased by 122.7%, the limiting oxygen index value was increased by 43.0%, and the peak heat release rate (pHRR), the peak total heat release rate (pTHR), and the peak mass loss rate were decreased by 19.9%, 10.8%, and 27.2%, respectively, in comparison to the non-flame retardant-treated poplar veneer. Furthermore, the residual char mass increased by 14.4%, and the residual char exhibited enhanced thickness, density, and regularity. The results demonstrated that MCA was an effective promoter of sodium silicate dispersion in acrylic coatings. Furthermore, the sodium silicate/MCA/waterborne acrylic flame-retardant coating significantly enhance the flame retardancy of wood, and its flame retardant mechanism was consistent with the synergistic silicone–nitrogen expansion flame-retardant mechanism. This work presents a novel approach to enhancing the dispersion of inorganic flame retardants in organic coatings, offering a valuable contribution to the advancement of research and application in the domains of innovative flame retardant coatings and flame retardant wood.

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“…Since the adsorption technology does not require saponification in the separation process of nickel and cobalt, it avoids the generation of salty wastewater and shows potential advantages [14][15][16]. Adsorption materials are divided into organic materials and inorganic materials, such as chelating resin [17], cellulose [18], chitosan [19], inorganic silicone [20], activated carbon [21], etc. Among them, inorganic silica gel has been widely studied due to its excellent characteristics, such as high mechanical strength and stable physicochemical properties [22,23].…”

Section: Introductionmentioning

confidence: 99%

Insight into the Mechanism of Cobalt-Nickel Separation Using DFT Calculations on Ethylenediamine-Modified Silica Gel

Yang

Yuan

et al. 2023

Materials

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The separation of Co(II) and Ni(II) from leaching solution is gaining interest because Co(II) and Ni(II) are increasingly used in emerging strategic areas, such as power batteries. Herein, the surface of silica gel is functionalized with 1,2-ethylenediamine and used for the separation of Co(II) and Ni(II). The Co(II) removal efficiency of the modified silica is 80.2%, with a 4-fold improvement in the separation factor. The geometry, frequency, and electrostatic potential of the ethylenediamine modified silica gel (en/SG) are calculated. The corresponding properties of M2+ (M-Co, Ni) adsorbed on en/SG in an aqueous solution are simulated and analyzed. The results show that ethylenediamine tends to form [Men(H2O)4]2+ after binding to M2+, and the binding ability of Co(II) to ethylenediamine is stronger. Besides, the thermodynamic calculations show that en/SG has a more negative Gibbs free energy when absorbing Co(II) in aqueous solution, so en/SG is more inclined to bind with Co(II) preferentially. It is the difference in complexation ability between Ni, Co, and ethylenediamine that enlarges the difference in the original physical adsorption, thus strengthening the separation performance. This work will provide guidance for a rational design of high-performance nickel-cobalt adsorption materials.

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Three sources-in-one bio-MOFs doped silicone acrylic emulsion-based waterborne flame-retarding coatings with formaldehyde adsorption property

Cited by 6 publications

References 57 publications

Synthesis and Characterization of Sodium Lignosulfonate-Based Phosphorus-Containing Intermediates and Its Composite Si–P–C Silicone-Acrylic Emulsion Coating for Flame-Retardant Plywood

Synthesis and Characterization of Sodium Lignosulfonate-Based Phosphorus-Containing Intermediates and Its Composite Si–P–C Silicone-Acrylic Emulsion Coating for Flame-Retardant Plywood

A Novel Intumescent MCA-Modified Sodium Silicate/Acrylic Flame-Retardant Coating to Improve the Flame Retardancy of Wood

Insight into the Mechanism of Cobalt-Nickel Separation Using DFT Calculations on Ethylenediamine-Modified Silica Gel

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