Preparation and properties of silica sol/melamine glyoxal resin

Abstract

In this study, a composite modifier for wood impregnation is prepared, which is functional and environmentally friendly. The surface of silica sol was modified by using KH-560. The modified silica sol, melamine, and glyoxal were used as raw materials. The silica sol/melamine glyoxal resin (from now on referred to as Silica sol/MG) composite modifier was prepared based on in-situ polymerization. The physicochemical properties (viscosity, solid content and etc.) of the composite modifier were evaluated. The structural and thermal properties were characterized and analyzed by FTIR spectroscopy, particle size distribution, TG and DSC. The results showed that the viscosity and solid content of the composite modifier decreased with the increase in the mass of the silica sol. The FTIR spectroscopy showed peaks at 473 cm −1 and 1101 cm −1 , which were assigned to bending and stretching vibrations of the Si-O-Si bond, respectively, indicating that the modified silica sol was successfully introduced into the MG resin. When the modified silica sol mass fraction was 30%-40%, the particle size distribution of the composite modifier was relatively uniform. TG analysis found that the thermal stability of the composite modifier was significantly improved compared with the unmodified resin. DSC analysis showed that adding the modified silica sol reduced the curing temperature of the modifier from 115.5 °C to 107.9 °C.

Study on Modification of Poplar Wood via Composite Impregnation with Silica Sol/Melamine–Glyoxal Resin

“…As an environmentally friendly inorganic material with good thermal stability and biocompatibility, silica sol can effectively penetrate wood and form a stable space structure in the pore structure of wood due to its low viscosity and small particle size [15]. Combining silica sol with MG resin impregnation to modify poplar wood, enhancing its toughness and overall performance, holds significant value in raising its added value and expanding its range of applications [16].…”

“…In our previous study, KH-560 was used to modify the surface of silica sol. The silica sol/MG resin was prepared via in situ polymerization under weakly acidic conditions using melamine, glyoxal, and modified silica sol as raw materials and NaOH as catalyst [15]. In this study, we will further use the impregnation process to prepare poplar wood-modified material and explore the effect of the composite modifier on the physical and mechanical properties of the modified material.…”

Research on the Impregnation Process and Mechanism of Silica Sol/Phenolic Resin Modified Poplar Wood

“…The introduction of this method demonstrated the advantages of organic-inorganic co-polymer modification in the interaction between the phenolic resin and wood, thus achieving excellent impact performance not possessed by singular modification [20][21][22][23]. Therefore, this preparation method holds immense potential for widespread applications and is expected to play a significant role in the production of various high-performance composite materials [24][25][26].…”