The effect of some wood preservatives on the thermal degradation of Scots pine

Fire-resistance and thermal degradation were evaluated for particleboards incorporated with colemanite and common boron-based fire retardants (zinc borate and boric acid:borax mixture). The main purpose of this study was to suggest an alternative fire retardant to be used in particleboards with low cost and considerably lower environmental impact compared to common boron-based fire retardants. For this purpose, the colemanite mineral was chosen as a raw boron mineral because of its good fire performance demonstrated previously in wood-plastic composites. The test compounds were incorporated into the furnish during the particleboard manufacturing process. Fire performance tests and thermal degradation analysis were then performed in the treated particleboard specimens. Mass loss calorimeter tests were applied to determine the oxidative thermal degradation properties of the produced particleboards, whilst thermogravimetric analyses were used to evaluate the non-oxidative thermal behavior of the particleboards. The lowest peak heat release rate and the highest activation energy values were recorded for the boric acid:borax mixture-incorporated particleboards at a loading level of 10%. Overall the results showed that colemanite had a lower fire-retardant property in the particleboards compared to the common boron-based compounds tested in the study.

“…al. 1997;Orfao et al 1999;Wang et al 2004;Prins et al 2006;Gao et al 2006;Di Blasi 2008;Shen et al 2009;Gašparovič et al 2010;Tomak et al 2012).…”

Section: Thermal Analysis Results and Activation Energy Calculationunclassified

“…A char layer acts a thermal barrier on wood surface and saves the wood component especially cellulose against a severe thermal degradation. Some types of fire retardants have a similar mechanism of action (Karastergiou and Philippou 2000;Wang 2004;Gao 2006;Tomak et al 2012).…”

Section: Thermal Analysis Results and Activation Energy Calculationmentioning

confidence: 99%

Thermal Degradation of Particleboards Incorporated with Colemanite and Common Boron-based Fire Retardants

Terzi

2018

“…The lowest weight loss was observed in the particleboards coated with 5.0% BA. This result reflects that BA activates charring and retards fire in wood (Tomak et al 2012).…”

Section: Fire Performancementioning

confidence: 58%

Effects of Coating with Calcite together with Various Fire Retardants on the Fire Properties of Particleboard

Özdemir

Tutuş

2016

The fire properties of particleboard coated with calcite and a variety of fireretardants (FR) was investigated. Four different chemicals, boric acid (BA), borax (BX), dolomite (DOL), and melamine (MEL), were added at the concentration of 1.0%, 3.0%, and 5.0% by oven-dry weight of calcite. The particleboard panels were tested according to the ASTM-E 69 standard to investigate their fire-retardant properties. The determination of weight loss, temperature, and the release of O2, CO, and NO by the samples was measured and recorded over 30 s intervals during combustion of the materials. The results indicated that the BA coatings exhibited better thermal stability than the other chemicals. Consequently, the lowest weight loss and temperature was found for specimens treated with 5.0% BA. These chemicals were effective relative to the fire properties of coated particleboard surfaces, depending on the type and ratio of the chemicals to the calcite.

“…When the boride decomposes it absorbs a large amount of heat with the help of water loss at a high temperature, so the surface temperature of the materials is reduced (Wang et al 2004). At the same time, boron oxide from the pyrolysis products forms a viscous coating that covers the surface of the materials, which acts a barrier against oxygen and heat (Tomak et al 2012).…”

Section: Analysis Of Hrr and Thrmentioning

confidence: 99%

Flame Retardant Properties of Laminated Bamboo Lumber Treated with Monoammonium Phosphate (MAP) and Boric acid/Borax (SBX) Compounds

Jin¹,

Jiang²,

Wen³

et al. 2017

This study aimed to improve the flame-retardant properties of laminated bamboo lumber (LBL) using phosphorus-nitrogen-boron flame retardants (FRs). The combination of a 7:3 ratio of monoammonium phosphate (MAP) and boric acid/borax compounds (SBX), and 74.32 kg/m 3 of FRs (10.3% weight gain), exhibited enhanced fireproofing performance for LBL materials. A commercial flame retardant (guanylurea phosphate) (GUP) was systematically studied as a comparison. A cone calorimeter and a thermal analyzer were used to characterize the combustion behavior and thermal stability, respectively. The flame retardants morphology in bamboo cell cavities was investigated using scanning electron microscopy (SEM) and an energy dispersive X-ray analysis (EDXA). The results showed that at a heat flux of 50 kW/m 2 , the heat release rate and the total heat release of LBL samples treated with MAP-SBX flame retardants decreased more considerably than that of the untreated samples. The use of MAP-SBX not only promoted carbonization of LBL greatly but also indicated a good performance of smoke and combustion suppression as well as for the GUP. Flame retardants were confirmed to penetrate into the cell cavities of the bamboo using SEM and EDXA.