The Influence of the Accelerated Aging Process on the Compressive Strength of Wood Treated with Components of a Salt Fire Retardant

Grześkowiak, Wojciech; Molińska-Glura, Marta; Przybylska, Marcelina

doi:10.3390/ma15144931

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…This technique is described in detail in our patent [14]. A similar stabilization result is achieved by using a urea-formaldehyde oligomer (UFC) pre-condensate, using the method of processing wood with urea-formaldehyde oligomer (described in detail in our patent [15].…”

Section: Experimental Partmentioning

confidence: 97%

Stabilization of shapes and dimensions of compressed wood using chemical and physical methods

et al. 2023

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Descriptions of methods and results of experiments on the preservation of geometry and dimensional parameters of compressed wood using chemical and physical methods are given. Wide ranges of substances were used as chemical stabilizers in urea aqueous solution (plasticizer during pressing). Wood treatment with ultrasound, liquid nitrogen and pulsed magnetic field was used as physical methods. Urotropine, urea-formaldehyde oligomer, phenol-formaldehyde resin, butyric anhydride and physical methods (liquid nitrogen and pulsed magnetic field), as well as ultrasound can be applied to increase form stability of pressed wood to the level of swelling in water and water absorption of natural wood (respectively, 15-20% and 30-45%). Cashew nut shell liquid is recommended to obtain stable pressed wood. The liquid, with a content of 6-12% (by dry residue) relative to the mass of dry wood during heat treatment in the temperature range of 150-155°C for 8 hours, gives limiting volume swelling 7-8% and limiting water absorption 14-18%. Fully stable compressed wood was obtained after exhaustive acetylation with acetic anhydride and subsequent maximum impregnation with phenol alcohols (more than 70% of content) and thermocatalytic curing. However, this method cannot be recommended due to high toxicity and material weakness.

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Section: Experimental Partmentioning

confidence: 97%

Stabilization of shapes and dimensions of compressed wood using chemical and physical methods

et al. 2023

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“…However, the use of flame retardants affects the mechanical properties of the wood. Grześkowiak et al [9] determined the effect of wood flame retardants on the compressive strength and elastic modulus of wood as a function of accelerated aging time. The wood was treated with solutions of chemical compounds included in the flame retardant formulations, i.e., monoammonium phosphate, boric acid, sodium tetraborate (borax), urea, monoammonium sulphate and diammonium phosphate, as well as commercially available formulations.…”

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confidence: 99%