Non-Newtonian liquid, method for producing the non-Newtonian liquid, and polymer composite

Abstract

The subject of the application is a non-Newtonian fluid, a method for obtaining a non-Newtonian fluid, and a polymer composite. The non-Newtonian fluid comprises from 60 to 80 parts by weight of polyethylene glycol and from 20 to 40 parts by weight of hydrophilic colloidal silica, and further preferably comprises at most 1 part by weight of bentonite or at most 1 part by weight of expanded perlite. The method for obtaining a shear-thickening non-Newtonian fluid is carried out in such a way that, in the first stage, the hydrophilic colloidal silica is dried at a temperature of from 100°C to 140°C for a time of from 4 to 6 hours, and then 20 to 40 parts by weight of it is weighed. In the second stage, it is divided into portions and introduced in portions into polyethylene glycol, being in an amount of from 60 to 80 parts by weight. wt., with continuous mixing, wherein after each addition of a portion of colloidal silica to polyethylene glycol, mixing is carried out at an initial speed of 100 to 500 rpm. / min, and furthermore, the system is cooled by means of a water jacket at a water temperature from 20°C to 25°C. As the viscosity of the liquid increases, the mixing speed is increased to a value of from 5000 to 10000 rpm. Portions of colloidal silica are introduced into the polyethylene glycol at time intervals of at least 15 min. In the third stage, after all portions of colloidal silica have been added to the polyethylene glycol, the system is mixed at a speed of from 2000 to 10000 rpm for at least 40 min. The polymer composite has at least one reinforcement layer impregnated with a non-Newtonian liquid which comprises from 60 to 80 parts by weight of polyethylene glycol and from 20 to 40 parts by weight of hydrophilic colloidal silica, and further preferably comprises at most 1 part by weight of bentonite or at most 1 part by weight of expanded perlite.