Research on Flame Retardant Formaldehyde-Free Plywood Glued by Aqueous Polymer Isocyanate Adhesive

1) Due to pronounced mechanical performance and being environmental friendly, aqueous polymer isocyanate adhesive (API) has been widely applied in the production of formaldehyde-free wood products. In this study, flame retardant formaldehyde-free plywood was prepared by incorporation of flame retardants into the API adhesive. Partially phosphorylated poly (vinyl alcohol) (PPVA) which was prepared by reacting poly (vinyl alcohol) with phosphoric acid was used to replace PVA in API formula. In addition, Mg-Al layered double hydroxides (LDH) was chosen as additive flame retardant, replacing traditional filler CaCO3 in API adhesive formula. And then, the flame retardant API adhesive with main agent (PPVA replacing PVA70wt.%, SBR emulsion 30wt.%), curing agent 10wt.% (accounts for of the main agent), and 20wt.% LDHs (accounts of the main agent) was used to prepare flame retardant plywood. The effect of application of PPVA and Mg-Al LDH on bonding strength of plywood was investigated. The flammability characteristics of the plywood were determined by cone calorimeter test (CCT). The results revealed that compared with the plywood prepared with API adhesive, the use of PPVA and LDH enhanced the flame retardancy of plywood without negatively affecting bonding strength. The CCT tests indicated that the heat release and smoke production flame retardant API plywood were lower than those of the ordinary API glued plywood. Promising developments for flame retardant API adhesive were expected in future applications of flame retardant formaldehyde-free plywood.

[1]  Xiao-ji Shen,et al.  Ag nanoparticles supported on MgAl-LDH decorated wood veneer with enhanced flame retardancy, water repellency and antimicrobial activity , 2020 .

[2]  Yeonjung Han,et al.  Flame Retardancy of Wood Products by Spreading Concentration and Impregnation Time of Flame Retardant , 2020, Journal of the Korean Wood Science and Technology.

[3]  Hongjiu Hu,et al.  Effect of sodium dodecyl sulfate (SDS) on mechanical performance of polyvinyl-acetate-based emulsion polymer isocyanate , 2020 .

[4]  Rongjie Yang,et al.  Mechanical and flame‐retardant properties and thermal decomposition of vinyl ester resin modified by different phenyl silsesquioxanes , 2020 .

[5]  Yong‐Mook Kang,et al.  Rational design of phosphorylated poly(vinyl alcohol) grafted polyaniline for waterborne bio-based alkyd nanocomposites with high performance , 2020 .

[6]  Si-Yu Li,et al.  The effect of ammonium polyphosphate on the mechanism of phosphorous-containing hydrotalcite synergism of flame retardation of polypropylene , 2020 .

[7]  Jiapeng Li,et al.  Polyethylene glycol supported by phosphorylated polyvinyl alcohol/graphene aerogel as a high thermal stability phase change material , 2019 .

[8]  Xiaojun Zhu,et al.  Efficient flame-retardant and smoke-suppression properties of MgAlCO3-LDHs on the intumescent fire retardant coating for steel structures , 2019, Progress in Organic Coatings.

[9]  G. Wallace,et al.  Engineering the poly(vinyl alcohol)-polyaniline colloids for high-performance waterborne alkyd anticorrosion coating , 2019, Applied Surface Science.

[10]  YaChao Wang,et al.  Preliminary study on decanoic/palmitic eutectic mixture modified silica fume geopolymer-based coating for flame retardant plywood , 2018, Construction and Building Materials.

[11]  Matthew S. Hoehler,et al.  A novel application of silicone-based flame-retardant adhesive in plywood. , 2018, Materials & design.

[12]  Si-Yu Li,et al.  Effect of P3O105− intercalated hydrotalcite on the flame retardant properties and the degradation mechanism of a novel polypropylene/hydrotalcite system , 2018, Applied Clay Science.

[13]  Long Yan,et al.  Synergistic effects of organically modified montmorillonite on the flame-retardant and smoke suppression properties of transparent intumescent fire-retardant coatings , 2018, Progress in Organic Coatings.

[14]  T. Iwata,et al.  In-situ chemical structure analysis of aqueous vinyl polymer solution-isocyanate adhesive in post-cure process by using Fourier transform near infrared spectroscopy , 2018 .

[15]  Seung-Won Oh,et al.  Effect of Carbonization Temperature on the Surface Temperature of Carbonized Board , 2018, Journal of the Korean Wood Science and Technology.

[16]  Ji-won Park,et al.  Preparation of EVA/Intumescent/Nano-Clay Composite with Flame Retardant Properties and Cross Laminated Timber (CLT) Application Technology , 2018, Journal of the Korean Wood Science and Technology.

[17]  K. Hirota,et al.  Crystallisation of hydroxyapatite in phosphorylated poly(vinyl alcohol) as a synthetic route to tough mechanical hybrid materials. , 2017, Materials science & engineering. C, Materials for biological applications.

[18]  F. Richard,et al.  Multi-scale modeling of the thermal decomposition of fire retardant plywood , 2014 .

[19]  Sang-Bum Park,et al.  Decay Resistance and Anti-mold Efficacy of Wood Treated with Fire Retardants , 2013 .

[20]  Seung-Won Oh,et al.  Flame retardant performance of wood treated with flame retardant chemicals. , 2012 .

[21]  Sang-Bum Park,et al.  Combustion Characteristics of Bamboo Charcoal Boards , 2012 .

[22]  L. Ye,et al.  Flammability characteristics and flame retardant mechanism of phosphate-intercalated hydrotalcite in halogen-free flame retardant EVA blends , 2008 .