Mg(OH)2 and PDMS-coated cotton fabrics for excellent oil/water separation and flame retardancy

Solvent‐free synthetic methods have received more attention because of their reducing chemical waste and simplifying the process. A series of functionalized magnesium hydroxides (FMHs) were successfully modified with siloxanes containing different functional groups (Octyl: OTES, Octadecyl: OTMS, Phenyl: PTMS, Vinyl: VTEO, and 3‐Aminopropyl: APS) via a solvent‐free mechanochemical method. Ball milling conditions (such as reaction time, siloxane/MH ratio), the morphology, surface properties and particle size of the FMHs were investigated in detail and the results showed that both of the adjustment of particle size and the modification of surface of MH were successfully achieved at one time within 20 min. All FMHs were successfully converted from hydrophilic to hydrophobic except for the sample modified by the silane containing APS group. The influence of the different functional groups and particle size of FMHs on the mechanical properties and flame retardancy of styrene‐ethylene‐butadiene‐styrene (SEBS)/polypropylene (PP) composites were discussed. Compared with original MH/SEBS/PP, the FMHs/SEBS/PP composites have better tensile strength and elongation at break. When 68 wt% of FMHs were added to the SEBS/PP matrix, the composites can pass V‐0 rating of UL‐94 testing, and their limiting oxygen index values are above 32.3%. Meanwhile, the composites also exhibited strong smoke suppression.

Section: Introductionmentioning

confidence: 99%

Study of the effect of different functionalized magnesium hydroxide prepared by mechanochemical method on the flame retardancy and mechanical properties of styrene‐ethylene‐butadiene‐styrene/polypropylene composites

Wang

Chu

et al. 2022

“…It achieves flame retardancy by releasing a large amount of water and diluting the fuel that maintains combustion. In addition, water also absorbs the heat generated in the combustion zone, and MH can form a metal oxide coating to serve as an insulating protective layer during combustion 20–22 . Nanometerized MH can improve the flame retardancy, mechanical performances, and other properties of polymers because of its small size and thus, large surface effect 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Construction of thermoplastic cellulose esters matrix composites with enhanced flame retardancy and mechanical properties by embedding hydrophobic magnesium hydroxide

Zhang

Zhou

Zhang

et al. 2021

Biomass‐based composites with renewability and biodegradability have attracted extensive researches, but their applications are hindered by poor mechanical properties and flame retardancy. Cellulose ester matrix composites (CEMC), a kind of biomass‐based composites, were prepared with inorganic crystals as flame retardant and reinforcement. Cellulose acetate oleate (CAO) prepared by mechanical activation‐assisted solid‐phase reaction was used as thermoplastic matrix. Hydrophobic oleate‐magnesium hydroxide (O‐MH), which was surface‐modified with oleic acid, was embedded into CAO to prepare O‐MH/CAO composites by hot pressing. The introduction of oleoyl contributed to favorable thermoplasticity of cellulose ester, resulting in enhanced thermal stability and mechanical properties of CEMC. The uniform dispersion of O‐MH in the CAO matrix via metal–organic coordination increased the mechanical properties and flame retardancy of O‐MH/CAO composites, ascribing to the toughening effect and combustion inhibition effect induced by O‐MH. This study provides a feasible technology for fabricating the CEMC with outstanding thermal stability and mechanical properties.

“…It is a direct method to endow paper with flameretardant by adding flame-retardant. Additive-type flameretardants, such as Al(OH) 3 , Mg(OH) 2 , CaSiO 3 , and Mg-Al Hydrotalcites, [3][4][5][6][7] are directly added to the paper making process. Due to its low flame-retardant efficiency, the amount of inorganic flame-retardant is often large, which damages the mechanical properties of the paper.…”

Section: Introductionmentioning

confidence: 99%

Smoldering suppression and synergistic effect of alginate fiber‐based composite paper by flame‐retardant lyocell fiber

Tian

et al. 2021

The application of traditional cellulosic paper is limited because of its flammability, so it is necessary to explore new materials that can be used in the field of flame-retardant paper. Based on the synergistic effect between fibers, flameretardant lyocell (FRL) and calcium alginate (FRL/Ca-Alg) composite paper is prepared by a simple but efficient method. The thermal degradation process of the composite paper is analyzed by thermogravimetric (TG) and TG analysis coupled with Fourier transform infrared, the flame retardancy of the composite paper is analyzed by vertical flammability (VF) tests, limiting oxygen index test and cone calorimetry test, and the morphology of the residue after VF tests is observed by scanning electron microscopy. It is found that, the Ca-Alg releases a large amount of CO 2 before ignited, which delayed the ignited time of the composite paper; FRL reduces the effective combustion heat of composite paper during combustion, and the compact char formed by FRL effectively inhibits the smoldering of Ca-Alg in the end stage of combustion. Based on these, the synergistic flame-retardant effect of composite paper is proposed.