Effect of stearic acid and epoxy silane on the structure and flame-retardant properties of magnesium hydroxide/ethylene vinyl acetate copolymer/very low density polyethylene composites

2012 ◽  
Vol 126 (1) ◽  
pp. 13-20 ◽  
Author(s):  
He Rong ◽  
Xu Man ◽  
Zhong Lisheng ◽  
Xie Darong ◽  
Tuo Xinlu ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Flame Retardant ◽  
Vinyl Acetate ◽  
Magnesium Hydroxide ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Flame Retardant Properties ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

scholarly journals Enhanced Flame Retardancy in Ethylene–Vinyl Acetate Copolymer/Magnesium Hydroxide/Polycarbosilane Blends

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 36
Author(s):  
Tiefeng Zhang ◽  
Chunfeng Wang ◽  
Yongliang Wang ◽  
Lijun Qian ◽  
Zhidong Han
Keyword(s):  
Synergistic Effect ◽  
Flame Retardant ◽  
Vinyl Acetate ◽  
Magnesium Hydroxide ◽  
Ethylene Vinyl Acetate ◽  
Infrared Spectrometry ◽  
Limiting Oxygen Index ◽  
Blending Method ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

A polymer ceramic precursor material—polycarbosilane (PCS)—was used as a synergistic additive with magnesium hydroxide (MH) in flame-retardant ethylene–vinyl acetate copolymer (EVA) composites via the melt-blending method. The flame-retardant properties of EVA/MH/PCS were evaluated by the limiting oxygen index (LOI) and a cone calorimeter (CONE). The results revealed a dramatic synergistic effect between PCS and MH, showing a 114% increase in the LOI value and a 46% decrease in the peak heat release rate (pHRR) with the addition of 2 wt.% PCS to the EVA/MH composite. Further study of the residual char by scanning electron microscopy (SEM) proved that a cohesive and compact char formed due to the ceramization of PCS and close packing of spherical magnesium oxide particles. Thermogravimetric analysis coupled with Fourier-transform infrared spectrometry (TG–FTIR) and pyrolysis–gas chromatography coupled with mass spectrometry (Py–GC/MS) were applied to investigate the flame-retardant mechanism of EVA/MH/PCS. The synergistic effect between PCS and MH exerted an impact on the thermal degradation products of EVA/MH/PCS, and acetic products were inhibited in the gas phase.

scholarly journals ОПТИМІЗАЦІЯ ЕКСПЛУАТАЦІЙНИХ ВЛАСТИВОСТЕЙ ВОГНЕЗАХИСНОГО ПОЛІМЕРНОГО ІНТУМЕСЦЕНТНОГО ПОКРИТТЯ

2020 ◽  
Vol 138 (5) ◽  
pp. 79-86
Author(s):  
Н. А. Таран ◽  
К. В. Калафат ◽  
Л. І. Вахітова ◽  
В. П. Плаван
Keyword(s):  
Flame Retardant ◽  
Vinyl Acetate ◽  
Expansion Coefficient ◽  
Water Resistance ◽  
Ethylene Vinyl Acetate ◽  
Complex Compounds ◽  
Intumescent Coatings ◽  
Flame Retardant Properties ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Study of the effect of intumescent complex compounds on the basis of aminoderivatives of 2,4,8,10-tetraoxа-3,9-diphosphaspiro[5,5] undecane on the flame retardant properties and water resistance of the ethylene vinyl acetate copolymer in the flame retardant polymer compositions. The structure of intumescent compounds has been confirmed by the methods of elemental analysis and IR spectroscopy, the flame retardant properties of the intumescent systems have been investigated using the method of thermogravimetric analysis. Methods of synthesis of intumescent compounds based on 2,4,8,10-tetraoxа-3,9-diphosphaspiro[5,5]undecane and urea, melamine, dicyandiamidе and mixtures there of have been developed. The synthesized compounds have been shown to enhance the flame retardant properties of the ethylene vinyl acetate copolymer, exhibit an intumescent effect and participate in the construction of a char thermal insulation layer. It has been shown that the water resistance of fire retardant systems with the participation of intumescent complex compounds is much higher than the systems of ammonium polyphosphate / melamine / pentaerythritol composition. The expansion coefficient of intumescent systems containing of intumescent compounds to decrease by 10 - 20% after hydrothermal effects, while, as the expansion coefficient of the traditional intumescent system  in the same conditions is reduced by 40%. According to the results of accelerated hydrothermal tests, the stability of polymeric intumescent coatings with the participation of intumescent complex compounds to the action of moisture under conditions of temperature difference was determined. The obtained results indicate the prospect of using the investigated intumescent compounds for the creation of new technologies of intumescent coatings for wood with a long operation life.

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