New manufacturing methodology for boron-based rods for remedial treatments of wood: solubilities and some physical and t
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New manufacturing methodology for boron‑based rods for remedial treatments of wood: solubilities and some physical and thermal properties of the rods Seçil Aydın1 · Evren Terzi2 · S. Nami Kartal2 · Sabriye Pişkin1 · Serpil Kılıç Depren3 · Aysel Kantürk Figen1 Received: 12 May 2020 / Accepted: 28 September 2020 © Springer Nature Switzerland AG 2020
Abstract Boron-based rods are ideal for remedial treatments in wood attacked by decay fungi, insects and termites as well as for preventive treatments of high-risk areas in structural timbers and logs internally. This study evaluated the solubility, some physical and thermal properties of the boron-based rods manufactured from either raw ulexite mineral, raw colemanite mineral, di-sodium octaborate tetrahydrate (DOT), and their combination of silica-based plasticizer. This is the first attempt to produce ulexite and colemanite-based boron rods with/without additional compound by an extruder. To take the advantages of boron minerals, rods were produced with paste mixtures of boron compounds and plasticizer by a single-screw extrusion method. Solubility and thermal resistance tests as well as micro-hardness tests were performed to determine the quality and strength of the rods for discussing the on-site applications. The paste content was an important factor affecting the transport processes during single screw extrusion with special emphasis on the rod formation. No macro-structural changes were observed when the boron rods were exposed to heat at 30, 50, 70, 100, and 200 °C. According to the Kruskal–Wallis test, no significant difference was observed in micro-hardness values of thermally treated boron-based rods; however, at high temperatures up to 50 °C, there was a decrease in hardness of DOT rods. The rods manufactured by extrusion methods showed similar water solubility when compared to raw ulexite and colemanite minerals. Keywords Rods · Boron · Ulexite · Colemanite · Remedial treatments · Wood
1 Introduction There is a continually growing interest in the use of remedial treatments to increase the service life of wood and wooden structures against biodegradation by fungi, insects, and termites. The service life of wooden members in buildings can be considerably increased by remedial or in-place treatments by using various technologies and preservative chemicals. Such wood protecting chemicals for remedial treatments are generally categorized as shown
[1, 2]: (1) Thixotropic pastes and preservative greases, (2) oil borne and waterborne solutions, and emulsions, (3) preservative rods and pads, and (4) liquid and solid fumigants. The main aim of remedial treatments is to distribute preservative compounds into the zones of a wood member in structures exposed to moisture/wetting or not previously protected by wood protecting chemicals [3]. Various modes of movement and efficacy are available for each chemical stated above. Solubility and distribution of
* Aysel Kantürk Figen, [email protected] | 1Department of Chemical Engineering, Faculty of Chemistry‑Metallu
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