Determining the effect of the composition of an aluminosilicate binder on the rheotechnological properties of adhesives for wood

Main rheotechnological properties of aluminosilicate adhesives for gluing wood arrays have been investigated. It was established that for adhesives based on the alkaline aluminosilicate binding agent with a composition of Na 2 O×Al 2 O 3 ×4.5SiO 2 ×17.5H 2 O dynamic viscosity in the range of speeds from 0 to 200 RPM varies from 6.933 sP to 368.4 Sp, and the mean plastic viscosity takes the magnitude of 86.27 sP. At the same value of surface tension and cohesive work, the smallest angle of wetting (cosQ=0.7973) and the largest coefficients of wetting ( s =0.8986) and spreadability ( f =–6.5 mN/m), as well as the work of adhesion forces ( Wa =58.23 mN/m), wetting ( Wa =58.23 mN/m), are demonstrated by beech backing, followed by alder, ash, pine, birch, and oak. For adhesives based on the alkaline aluminosilicate binding agent with a composition of Na 2 O×Al 2 O 3 ×6SiO 2 ×20H 2 O dynamic viscosity in the speed range from 0 to 200 RPM varies from 5.340 sP to 374.4 sP, and the mean plastic viscosity takes the magnitude of 85.72 sP. At the same value of surface tension and cohesive work, the smallest angle of wetting (cosQ=0.5876) and the largest coefficients of wetting ( s =0.7938) and spreadability ( f =–19.34 mN/m), as well as the work of adhesion forces ( Wa =74.46 mN/m), wetting ( Ww =27.56 mN/m), are demonstrated by alder backing, followed by pine, oak, birch, beech, and ash. For the adhesive with a composition of Na 2 O×Al 2 O 3 ×4.5SiO 2 ×17.5H 2 O, at low values of shear rate, from 0.0378 to 1.05 1/sec, the shear force increases from 26.21 dyne/cm 2 to 48.64 dyne/cm 2 . The data obtained significantly exceed the same indicators for a liquid glass at high shear rates, from 14 to 39 1/sec. For the adhesive with a composition of Na 2 O×Al 2 O 3 ×6SiO 2 ×20H 2 O, at low shear speeds there is a sharp increase in the shear effort, from 40 to 110 dyne cm 2 . This is due to the dispersion processes in the silica component. At an increase in the shear speed values from 5 to 42 1/sec, the shear effort increases from 110 to 158 dyne/cm 2 . This relates to the stabilization of viscosity values with the formation of a homogeneous adhesive structure