Utilization of Polypropylene Film as an Adhesive to Prepare Formaldehyde-free, Weather-resistant Plywood-like Composites: Process Optimization, Performance Evaluation, and Interface Modification

Abstract

To develop formaldehyde-free wood-based composites, plywood-like composites (WV/PPF) were prepared using wood veneer (WV) with polypropylene film (PPF) as a novel formaldehyde-free, water-resistant adhesive. To prepare WV/PPF, the effects of hot-pressing conditions (temperature, 165 to 195 °C; pressure, 0.9 to 1.3 MPa; duration, 40 to 70 s/mm; and adhesive dosage between adjacent WVs, 100 to 200 g/m 2 ) were investigated. Results showed that conditions at 180 °C, 0.9 MPa, 70 s/mm, and 150 g/m 2 gave WV/PPF desirable physical-mechanical properties. Then, WV/PPF was compared with plywood-like composites using, respectively, polyethylene film (PEF), urea-formaldehyde resin (UFR), and phenol-formaldehyde resin (PFR) as adhesives. Results showed that the physical-mechanical properties of WV/PPF were favored over WV/PEF and WV/UFR, and were comparable to those of WV/PFR. Maleic anhydride grafted polypropylene (MAPP) or γ-aminopropyltriethoxysilane (APTES) surface modification of WV was performed to enhance the interface compatibility of WV/PPF. Results showed that the physical-mechanical properties of modified WV/PPF were favored over those of WV/PFR; MAPP modification was better for shear properties, while APTES modification was better for dimensional stability and flexural properties. Overall, the environmental and technological benefits demonstrated the potential of WV/PPF as a novel construction and building material.

Термопластичні Полімери У Виробництві Фанерної Продукції: Переваги, Можливості Та Перспективи Застосування

“…Найбільшого застосування отримало хімічне модифікування (застосування сумібілізаторів) -малеїновим ангідридом (Goto et al, 1982, Segerholm et al, 2010, Song et al, 2017, полімер модифікований малеїновим ангідридом та хлорований одночасно (Tang et al, 2011), вінілтриметоксиланом (силан А-171) (Fang et al, 2014), фталевим ангідридом, малеїновим ангідридом, у-амінопропілтритоксиланом, дихлордиетилсиланом (Matuana et al, 1998), а також термічне модифі-, а також термічне модифі-термічне модифікування деревини (за температури 200 о С впродовж 5, 30, 60 хв) (Follrich et al, 2006).…”

“…ПEHТ -поліетилен високої щільності, (Song et al, 2016); 5. ПП -поліпропілен, (Song et al, 2017); 6. КФС -карбамідо-формальдегідна смола, (Fang et al, 2013); 7.…”

“…КФС -карбамідо-формальдегідна смола, (Fang et al, 2013); 7. ФФС -феноло-формальдегідна смола, (Song et al, 2017); 8. EN 314-2: 1993 -європейський стандарт з міцності клеєвого з'єднання у виробництві фанери.…”

“…ПВХ 4 -полівінілхлорид (Matuana et al, 1998); 5. ПП 5 -поліпропілен (Song et al, 2017); 6. ПЕНТ 6поліетилен високої щільності (Tang et al, 2011).…”

Properties of Thermoplastic-Bonded Plywood: Effects of the Wood Species and Types of the Thermoplastic Films

“…The great advantage of such polymers is that the formaldehyde emission of the plywood made by recycled plastics is very low compared to that of ordinary plywood made with urea-formaldehyde resin: the amount of emission is almost zero [18]. Formaldehyde-free wood-plastic plywood has been successfully produced using thermoplastic polymers as wood adhesive [18][19][20][21][22][23][24]. The various thermoplastic polymers were used for veneer bonding: low-density polyethylene (LDPE) [25], high-density polyethylene (HDPE) [17,19,20,24,26,27], PS [21,28], PP [16,23], or PVC [29,30].…”