Combined Fire Retardant Action of Phosphonated Structures and Clay Dispersion in Epoxy Resin

Investigation of the effect of nitrate oxide graphite on the parameters of char layer, obtained from the system of ammonium polyphosphate / melamine / pentaerythritol / epoxy resin under the influence of temperatures of 200–800 °С. Methodology. A fire retardant mixture was chosen as a model intumescent system ammonium polyphosphate / melamine / pentaerythritol. As a polymer component was used bisphenols A / F epoxy resin together with a polyamidoamine hardener. Nitrate oxide graphite was obtained by oxidation of natural scaly graphite with fuming nitrogen acid. The effect of impurities of nitrate oxide graphite was determined by thermogravimetry on the intumescence coefficient of intumescent compositions and the mass of the char residue intumescent compositions in temperature range of 200–800 °С. Findings. The influence of nitrate oxide graphite on the characteristics was studied of char layer of epoxy intumescent system ammonium polyphosphate / melamine / pentaerythritol / epoxy resin. The study of thermal oxidative degradation was carried out intumescent compositions in the temperature range 200–800 °С. It was shown that intercalated graphite compounds increase the thermal stability of the formed char layer at temperatures > 600 °С. Determined intumescence coefficients and thermogravimetric analysis of modified intumescent systems was performed nitrate oxide graphite with different degrees of intercalation, in the conditions of 200–800 °С. It was established that the optimal parameters of the char layer are in terms of volume intumescence coefficient and mass of the char residue are provided by graphites, which contain 15–25% of intercalant in its composition. But the results obtained allow us to determine nitrate oxide graphite as a promising modifier of epoxy intumescent systems to increase its fire protection efficiency. Originality. The influence of degree of intercalation of nitrate oxide graphite was studied on the characteristics of char layer of epoxy intumescent system for the first time. Practical value. The optimal content of intercalant in nitrate oxide graphite was established for the development of formulations of intumescent epoxy coatings with increased fire retardant properties.

Download Full-text

Development of fire retardant epoxy-based gelcoats for carbon fibre reinforced epoxy resin composites

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2020.106015 ◽

2021 ◽

Vol 151 ◽

pp. 106015

Author(s):

Ákos Pomázi ◽

Andrea Toldy

Keyword(s):

Carbon Fibre ◽

Epoxy Resin ◽

Fire Retardant ◽

Resin Composites ◽

Epoxy Resin Composites

Download Full-text

FIRE PROTECTIVE EFFICIENCY OF INTUMESCENT TYPE EPOXIDE COATING

JOURNAL of Donetsk mining institute ◽

10.31474/1999-981x-2021-1-143-153 ◽

2021 ◽

pp. 143-153

Author(s):

Lyubov Vakhitova ◽

◽

Nadiya Taran ◽

Konstantin Kalafat ◽

Volodymyr Bessarabov ◽

...

Keyword(s):

Epoxy Resin ◽

Epoxy Resins ◽

Flame Retardants ◽

Practical Importance ◽

Fire Retardant ◽

Practical Significance ◽

Protective Efficiency ◽

Intumescent Coating ◽

Polymer Component ◽

Intumescent System

Purpose. The purpose of this work is to study the thermal degradation of epoxy polymers and nanocomposites based on them in a fire retardant intumescent coating having a composition – ammonium polyphosphate / melamine / pentaerythritol. Methods. Thermogravimetric studies have been performed on the device “Thermoscan-2”, fire tests were performed by the method of “Bunsen burner”. Results. The influence of the structure of epoxy resin as a polymer component of the intumescent system on oxidative thermal destruction and fire retardant efficiency of reactive coating has been researched. The obtained results allow us to state that the best result has been demonstrated by Araldite GY 783 – epoxy resin of bisphenols A/F with a reactive solvent. The thermal properties of various epoxy resins and nanocomposites based on them with organomodified montmorillonite have been studied. It was found that montmorillonite in the nanocomposite increases the decomposition temperature of epoxy resin. Scientific novelty. It has been shown that the variation of the polymer component of the intumescent coating has little effect on the swelling rate, but the fire retardant efficiency of the intumescent composition containing epoxy resin of bisphenols A/F is higher than the same characteristic for the composition based on epoxy resin of bisphenol A. It has been established that the exclusion of pentaerythritol from the formulation of the epoxy intumescent system causes the formation of a more regular and durable char insulation layer. It has been proved that the use of additional, including nanostructured flame retardants, namely, modified montmorillonite, can increase the fire retardant efficiency of the coating. Practical significance. The obtained results are of practical importance for the development of new scientific approaches to the design of fire-fighting materials with improved performance characteristics through the use of polymers that provide the construction of a thermostable thermal insulation char layer. Through a series of systematic tests, it has been demonstrated that the use of nanoclay and nanocomposites based on epoxy resins allows to improve the formulations of intumescent coatings with high performance with the help of budget nanotechnologies.

Download Full-text

GC/MS Identification of Pyrolysis Products from Fire-retardant Brominated Epoxy Resin

Journal of Fire Sciences ◽

10.1177/0734904105047006 ◽

2005 ◽

Vol 23 (3) ◽

pp. 227-245 ◽

Cited By ~ 14

Author(s):

A. I. Balabanovich ◽

M. P. Luda ◽

L. Operti

Keyword(s):

Epoxy Resin ◽

Fire Retardant ◽

Pyrolysis Products ◽

Brominated Epoxy Resin

Download Full-text

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.842.314 ◽

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.

Download Full-text