scholarly journals Preparation and Synergistic Effect of Chitosan/Sodium Phytate/MgO Nanoparticle Fire-Retardant Coatings on Wood Substrate through Layer-By-Layer Self-Assembly

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 848 ◽  
Author(s):  
Feiyue Zhao ◽  
Tingli Tang ◽  
Sijie Hou ◽  
Yanchun Fu
Keyword(s):  
Self Assembly ◽  
Energy Dispersive Spectrometry ◽  
Oxygen Index ◽  
Fire Retardant ◽  
Layer By Layer ◽  
Wood Substrate ◽  
Limiting Oxygen Index ◽  
Mgo Nanoparticles ◽  
Sodium Phytate ◽  
Mgo Nanoparticle

Fire-retardant chitosan/sodium phytate/MgO nanoparticle (CH/SP/nano-MgO) coatings were loaded on a wood substrate via electrostatic layer-by-layer self-assembly and characterized by scanning electron microscopy and energy-dispersive spectrometry. The flammability and thermal degradation of the original wood and wood samples treated with chitosan, chitosan/sodium phytate, chitosan/sodium phytate/MgO nanoparticles were studied by limiting oxygen index (LOI), exposure combustion experiments and thermogravimetric analysis (TGA), respectively. The CH/SP/nano-MgO coating served as an intumescent fire-retardant system that created a physical protection cover and exhibited the best fire retardant performance. The LOI value was 30.2% and required approximately 16–17 s to self-extinguish when exposed to air. The TGA curves also showed that char formation protected the wood from combustion.

scholarly journals Surface Properties of Spray-Assisted Layer-By-Layer ElectroStatic Self-Assembly Treated Wooden Take-Off Board

2021 ◽  
Vol 11 (2) ◽  
pp. 836
Author(s):  
Yi Wan ◽  
Sijie Hou ◽  
Mengyao Guo ◽  
Yanchun Fu
Keyword(s):  
Self Assembly ◽  
Treated Wood ◽  
Contact Angles ◽  
Water Repellent ◽  
Layer By Layer ◽  
Air Exposure ◽  
Limiting Oxygen Index ◽  
Sodium Phytate ◽  
Static Contact ◽  
Combustion Tests

Wooden take-off board is easy to crack, deform, discolor, and decay when it is used outdoors, which not only increases maintenance costs but also reduces its service life. Multifunctional coatings with UV-resistant, water-repellent, and flame-retardant properties were successfully obtained on the surface of a wooden take-off board substrate by spray-assisted layer-by-layer self-assembly. The coatings consisted of positively-charged chitosan, Al (OH)3, and negatively-charged sodium phytate through electrostatic adsorption several times. The treated wood exhibited high UV resistance, and the color remained constant after 720 hours of ultraviolet irradiation. The wettability of the wood surface after treatment became superhydrophobic, with initial static contact angles as high as 140°. In addition, limiting oxygen index and air exposure combustion tests were used to verify that chitosan, sodium phytate, and aluminum hydroxide could synergistically confer significant fire resistance to modified wood.

scholarly journals Flame-Retardant Wood Composites Based on Immobilizing with Chitosan/Sodium Phytate/Nano-TiO2-ZnO Coatings via Layer-by-Layer Self-Assembly

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 296 ◽  
Author(s):  
Lin Zhou ◽  
Yanchun Fu
Keyword(s):  
Flame Retardant ◽  
Flame Retardancy ◽  
Self Assembly ◽  
Composite Coatings ◽  
Wood Products ◽  
Layer By Layer ◽  
Zno Nanoparticle ◽  
Nano Tio2 ◽  
Limiting Oxygen Index ◽  
Sodium Phytate

Composite coatings of inorganic nanomaterials with polyelectrolytes are promising materials for wood modification. Endowing wood with flame retardancy behavior can not only broaden the range of applications of wood, but also improve the safety of wood products. In this work, chitosan/sodium phytate/TiO2-ZnO nanoparticle (CH/SP/nano-TiO2-ZnO) composite coatings were coated on wood surface through layer-by-layer self-assembly. The morphology and chemical composition of the modified wood samples were analyzed using scanning electron microscopy and energy dispersive spectrometry. The thermal degradation properties and flame retardancy of the samples treated with different assembly structures were observed by thermogravimetric analysis, limiting oxygen test, and combustion test. Due to the presence of an effective intumescent flame retardant system and a physical barrier, the CH/SP/nano-TiO2-ZnO coatings exhibited the best flame retardant performance and required only approximately six seconds for self-extinguishing. The coated samples had a limiting oxygen index of 8.4% greater than the original wood.

Preparation and Properties of Recycled-Polyester Nanocomposite Fibers Synergistic Modified with Phosphorus Containing Flame-Retardant and α-Zirconium Phosphate

2014 ◽  
Vol 789 ◽  
pp. 174-177 ◽  
Author(s):  
Zhi Hao Wu ◽  
Li Li Li ◽  
Shuai Shuai Jiang ◽  
Ze Xu Hu ◽  
Yu Chen Mao ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Melt Spinning ◽  
Zirconium Phosphate ◽  
Oxygen Index ◽  
Fire Retardant ◽  
Limiting Oxygen Index ◽  
Phosphorus Containing ◽  
Fire Retardant Properties ◽  
Nanocomposite Fibers ◽  
Positive Effect

Recycled-polyester (RPET) was melt blended with the phosphorus-containing flame retardant (FRP) and α-zirconium phosphate (α-ZrP). The thermal properties of RPET/FRP/α-ZrP composites were analyzed. Modified RPET fibers were prepared through melt spinning of dried RPET nanocomposite chips. The mechanical properties and fire-retardant properties of RPET/FRP/α-ZrP fibers containing different α-ZrP contents were tested. The results show that the synergism of α-ZrP and FRP exerts a positive effect on the mechanical and the flame-retardant property of RPET, leading to nanocomposite fibers of 1.9cN/dtex and 31.6% limiting oxygen index (LOI) value.

scholarly journals Decomposition and Flammability of Polyimide Graphene Composites

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 168
Author(s):  
Caroline Akinyi ◽  
Jimmy Longun ◽  
Siqi Chen ◽  
Jude O. Iroh
Keyword(s):  
Thermal Stability ◽  
Oxygen Index ◽  
Fire Retardant ◽  
Analysis Data ◽  
Condensation Polymerization ◽  
Limiting Oxygen Index ◽  
Thermally Stable Polymers ◽  
Decomposition Behavior ◽  
Polyimide Nanocomposite

Polyimide-graphene composites were synthesized by in-situ condensation polymerization and the thermal stability and decomposition behavior of the composites were studied. Polyimides, because of their aromatic backbone, are a class of fire-retardant polymers. Their high char retention ≥50% at testing temperatures ≥600 °C makes them thermally stable polymers. The effect of nanographene sheets on the decomposition behavior of polyimide is presented in this paper. It is shown that the reinforcement of polyimide with nanographene sheets significantly decreased the rate of decomposition of polyimide and increased the char retention of the composite. Thermogravimetric analysis data were used to assess the thermal stability, rate of mass loss and predicted limiting oxygen index of the neat polyimide and composites. Results obtained showed around a 43% decrease in the rate of polyimide degradation at 50 wt.% graphene loading. The limiting oxygen index of the polyimide nanocomposite was calculated by using the char retention, and it was found to increase by up to 24% at 50 wt.% graphene loading over that for the neat matrix.

Synthesis of a Flame Retardant and Hydrophobic Epoxy Resin with Multiple Elements Synergistic Effect for Tunnel Seepage Prevention Application

2020 ◽  
Vol 842 ◽  
pp. 314-325
Author(s):  
Bin Lin
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Oxygen Index ◽  
Fire Retardant ◽  
Practical Application ◽  
Water Contact ◽  
Limiting Oxygen Index ◽  
New Perspective ◽  
Grouting Materials

Epoxy resin (EP) mortar usually used to repair the cracking of concrete structure under damp environment, but EP is extremely flammable, thus it’s extremely imperative to design a novel multifunction EP grouting materials with flame retardancy and waterproofness for the practical application. Targeting ingenious decoration of EP grouting materials, multiple flame retardant elements (phosphorus, nitrogen and fluorine) are concurrently introduced into a fire retardant and the fire retardant defined as DDM-FNP. The obtained DDM-FNP/EP grouting composite possess high thermal stability, flame retardancy and hydrophobicity. The limiting oxygen index (LOI) value of DDM-FNP/EP composites has a significant improve, which is increased from 26.7 (EP-0) to 35.8 (EP-4). Composites with more than 10 wt% of DDM-FNP could pass UL-94 V-0 rating without dripping. Compared with EP-0, the PHRR and THR of EP-4 are decreased by 31.1% and 21.6%, respectively. In addition, due to the introduction of the F element, the water contact angle of EP composites is changed from 75.2° (hydrophilicity) to 98.6° (hydrophobicity) after the introduction of a certain amount of DDM-FNP flame retardant. Therefore, this work provide a new perspective to design a multifunction EP grouting composite and improve the value of practical application on seepage prevention of tunnel.

Thermal Degradation and Fire Retrandancy of Wood Impregnated with Nitrogen Phosphorus Flame Retardant

2014 ◽  
Vol 931-932 ◽  
pp. 152-156 ◽  
Author(s):  
Atchariyaphorn Phromsaen ◽  
Prinya Chindaprasirt ◽  
Salim Hiziroglu ◽  
Pornnapa Kasemsiri
Keyword(s):  
Weight Loss ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Degradation Rate ◽  
Oxygen Index ◽  
Fire Retardant ◽  
Limiting Oxygen Index ◽  
Running Water ◽  
Nitrogen Phosphorus

In this research, the effect of diammoniumphosphate (DAP) as fire retardant additive during thermal degradation of wood samples from shorea obtuse (Dipterocarpaceae) has been investigated. Thermal properties of wood samples impregnated with DAP ranging from 0-40 %wt were characterized by thermogravimetric analysis (TGA) and limiting oxygen index (LOI). Leachability of DAP from impregnated samples kept under running water was also investigated. The results indicated that the rate of weight loss obtained from TGA reveal that impregnation of DAP reduced the degradation rate from 0.95%/°C to 0.56%/°C. Furthermore, LOI of woods specimens trended to be increase from 24.8 to 30.6 when they were treated with DAP having a range of 0-30 %wt. Based on the results of this study, wood samples impregnated with 30%wt of DAP can be classified as self-extinguishing materials and cloud meet the requirement for non-flammability in construction. The leachability test indicated that only trace amount of unreacted DAP leached from the samples.

scholarly journals Formation of Chitosan/Sodium Phytate/Nano-Fe3O4 Magnetic Coatings on Wood Surfaces via Layer-by-Layer Self-Assembly

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 51 ◽  
Author(s):  
Tingli Tang ◽  
Yanchun Fu
Keyword(s):  
Wood Surface ◽  
Self Assembly ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Chitosan Solution ◽  
Layer By Layer ◽  
Nanoparticle Suspension ◽  
Sodium Phytate ◽  
Assembly Method ◽  
Modified Wood

Magnetic wood would have potential uses in electromagnetic shielding and electromagnetic wave absorption. In this paper, magnetic coatings on a wood surface were synthesized using a layer-by-layer self-assembly method. As the cationic polyelectrolyte carrier, natural macromolecular chitosan was pre-immobilized on a wood surface first, followed by the alternate adsorption of anionic polyelectrolyte sodium phytate and positively-charged Fe3O4 nanoparticles. The concentration of pH-controlled chitosan solution, sodium phytate solution, and Fe3O4 nanoparticle suspension, soaking time, and the number of alternating sedimentary layers varied. The morphology and crystal structure of the Fe3O4 modified wood samples were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The magnetic hysteresis loops showed that the modified wood had magnetic properties which were improved as the number of assembled layers increased.

scholarly journals Synergistic Effect of APP and TBC Fire-Retardants on the Physico-Mechanical Properties of Strandboard

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 435
Author(s):  
Feiyu Tian ◽  
Deliang Xu ◽  
Xinwu Xu
Keyword(s):  
Mechanical Properties ◽  
Flame Retardants ◽  
Oxygen Index ◽  
Fire Retardant ◽  
Modulus Of Rupture ◽  
Fire Retardancy ◽  
Thickness Swelling ◽  
Cone Calorimetry ◽  
Limiting Oxygen Index ◽  
Polymeric Diphenylmethane Diisocyanate

This study explored the feasibility of fabricating fire-retardant strandboard with low mechanical properties deterioration to the physico-mechanical properties. A hybrid fire-retardant system of ammonium polyphosphate (APP) and 1,3,5-tris(2,3-dibromopropyl)-1,3,5-triazinane-2,4,6-trione (TBC) was investigated. Thermogravimetric analysis results show that both APP and TBC enhance the thermal stability and incombustibility of wood strands. An infrared spectrum was applied to investigate the effect of flame retardants on the curing behaviors of polymeric diphenylmethane diisocyanate (PMDI) resin. Based on the results of limiting oxygen index (LOI) and Cone calorimetry (CONE), APP and TBC both lead to a higher fire retardancy to strandboard. It is worth mentioning that the two flame retardants lead to evidently differential influences on the modulus of rupture (MOR), modulus of elasticity (MOE), internal bond (IB), and water-soaking thickness swelling (TS) properties of strandboard. Hence, a hybrid flame retardant is prominent in manufacturing strandboard with both good fire retardant and satisfying physico-mechanical properties.

Coating of lightweight wool fabric with nano clay for fire retardancy

2019 ◽  
Vol 110 (5) ◽  
pp. 764-770 ◽  
Author(s):  
Seiko Jose ◽  
Nachimuthu Shanmugam ◽  
Sekhar Das ◽  
Ajay Kumar ◽  
Pintu Pandit
Keyword(s):  
Oxygen Index ◽  
Fire Retardant ◽  
Wool Fabric ◽  
Limiting Oxygen Index ◽  
Analytical Instruments ◽  
Flammability Test ◽  
Nano Clay ◽  
Fire Retardant Properties ◽  
In Fire

Nano-kaolinite was applied to lightweight wool fabric for imparting fire retardant finish using pad batch as well as exhaust method. The effect of fire retardant treatments on the physico-mechanical properties of wool fabric was studied in detail. Nano-kaolinite incorporated fire retardant formulations showed high fire retardant performance in terms of inclined flammability test, limiting oxygen index (LOI) and thermogravimetric analysis. The characterization of nanoparticles was performed using various analytical instruments. The results inferred that nano-kaolinite treatment by both application methods is effective for improving the fire resistance of wool fabric. The treatment resulted up to 32% enhancement in fire retardant properties.

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