POLYVINYL ALCOHOL AND SILICA WHITE AS THE MODIFIERS OF THE POLYCHLOROPRENE GLUE PROPERTIES
In the modern context, the increased requirements are being set for various materials and for the products obtained from them, regarding their service properties, meeting which is possible by choosing correct raw materials and processing parameters in manufacturing. The existing properties of material can be changed, and the new ones may be added due to introducing the so-called modifying additives that change both service properties and processing properties of the material, facilitating the process of making the product of this material and reducing the manufacturing costs. However, fillers are the additives that ensure the maximum modification of the polymeric binder. Moreover, the fillers, unlike other additives, do not form homogenous materials when mixed with the binder, but are distributed over it as isolated particles of a separate phase. The present state of the art requires creating new adhesives having better service properties. Modern glues are multicomponent systems. Filler is the key component of a glue. Glues are filled in order to increase their viscosity, reduce their penetration into porous substrates, and ensure their thixotropic and anti-corrosion properties, atmospheric resistance, as well as to increase their cohesion strength, electro- and thermo-conductivity, and shock strength. Moreover, introducing the fillers allows reducing the glue shrinkage, enhancing the strength of glue joints, changing the deformation properties of the glue joint, and reducing the internal stresses in the glue joint. We propose to use polyvinyl alcohol (PVA-16/1), silica white (SW-100), and the combinations thereof in different doses to adjust the properties of polychloroprene adhesive 88Н. Introducing the polyvinyl alcohol, silica white, or the combinations thereof would ensure the necessary viscosity levels of glue compositions, the increase in the cohesion strength of glue films, enhancing the strength of the glue joint, and also allows adjusting the water- and thermal resistance of glue joints as compared to the non-modified adhesive 88Н. Thus, upon the research performed, we can state the reasonability of using PVA-16/1 and the combination of silica white and PVA-16/1 for adjusting the viscosity of adhesives without any decrease in their strength, thermal resistance, water resistance, or other properties. We can also recommend the above compounds for commercial use.