## 1 Introduction
According to the study, the PVAc adhesive did not show performance enhancement after MWCNTs were added, but UF showed significant strength and wood failure improvements in all glued wood species. [PERSON] et al. [19] modified epoxy adhesives using nanofillers such as MWCNTs and used graphene nanoplatelets (GNPs) to modify specific characteristics. The nanofillers were added into the epoxy adhesive, where it was established that MWCNTs at 2% wt. and GNP at 8% wt. increased the electrical and thermal conductivity, respectively, keeping the same glue bond mechanical properties as neat epoxy resin. CETIN [20] reinforced a polyurethane wood adhesive using MWCNTs to obtain a better impact behavior on aluminum honeycomb sandwich composite structures. The structure was formed by a carbon fiber composite (CFRC) glued with neat polyurethane (PU) and polyurethane blended with MWCNTs at a concentration of 0.1% and 0.2% wt. Reinforced samples by MWCNTs showed the best results, reaching the highest maximum load and impact resistance values at a concentration of 0.1% MWCNT. [PERSON] and [PERSON] [21] also modified phenol-formaldehyde (PF) wood resin by carbon nanotubes (CNTs), at concentrations between 1% and 5% wt. PF adhesives with CNTs incorporated showed higher thermal stability and bonding strength at dry and wet conditions than neat PF adhesives. Lignosulfonate is originated from the pulp and paper process during sulfite treatment [22], where sulfonate groups are incorporated into lignin, making it soluble in water, which is possible because of the presence of sulfonate and carboxylic groups [23]. In addition, its aromatic and aliphatic elements play a fundamental role in obtaining a good relationship between the adhesive and surface, as well as interphases, which contribute to its good behavior as a surfactant [24; 25], making it an efficient dispersant agent for the manufacture of several industrial products [22]. Applying lignocellulosic application to adhesives Lignosulfonate has been applied to improve the performance of wood adhesives. [PERSON] et al. [26] developed a phenol-formaldehyde (PF) adhesive, incorporating from 20% to 100% of LIGNO on it, to manufacture particleboard panels. The study showed that mechanical properties were acceptable enough until 80% of LIGNO substitution, making it an interesting alternative for new wood adhesives generation. [PERSON] et al. [27] modified polyurethane adhesive by LIGNO, where good adhesion strength was attributed to an efficient blend homogenization and a good polymeric cross-linked network, revealing a significant cure activation energy. [PERSON] et al. [28] developed a LIGNO-based wood adhesive by enzymatic polymerization. A wood solid adhesion test showed that LIGNO-based adhesives had similar mechanical properties as polyvinyl acetate adhesive (PVAc-D3), but it was observed that wood specimens glued with LIGNO adhesives failed into the glue line, and there was no wood failure. [PERSON] et al. [29] developed different LIGNO-based adhesives to manufacture particle board panels with the presence of some cross-linking agents. Resistance to static bending results showed that most of the wood specimens glued with LIGNO-based adhesives reached the minimum value (0.35 N/mm\({}^{2}\)) required by European standards. The present work aims to Improve the mechanical and thermal properties of PVAc-D3 wood adhesives, since its low performance under adverse conditions restricts its industrial applications. This preliminary study is focused on finding an efficient alternative as a reinforcing agent to extend PVAc-D3 adhesive use fields. That is why, as a first approach to find a reinforcing filler for PVAc-D3 adhesive, it was sought to achieve an equal or similar performance as PVAc-D4 to study the glue line quality against moisture, and temperature variation, using non-toxic and convenient materials.