Possibilities of using sand-polymer composite materials in engineering products

Abstract

The article presents products for machine-building purposes, in which polymer composite materials are used. These products operate under friction, dynamic loads, aggressive chemical environments. Polymer composite materials are used because of the high deformation-strength characteristics and stamping of products. Products from sand-polymer composites are formed during the passage of several technological stages. Due to sufficient thermal stability, thermoplastics of the polyolefin class can be used as a polymer binder for the manufacture of parts in mechanical engineering. For parts operating under conditions of high elasticity, highly filled composites can be used. Sand-polymer composites based on polyethylene terephthal have increased deformation and strength characteristics. Such composites are highly resistant to aggressive media. Highly filled quartz-containing composites with polyhydroxyether are highly effective. The main components of sand-polymer composites are quartz sand and gravel mixtures. The deformation-strength properties of the obtained polymer composites depend on the composition of the fillers of their fractions. The use of lubricants and plasticizers improves the thermoforming of the composite due to an increase in the fluidity of the melt. An increase in the content of functional additives in place of an increase in quartz in the composite causes a decrease in its strength properties. An important stage in the production technology of a machine-building product is the mixing of the components of the sand-composite material. Mixing occurs in various ways: dry mixing of dispersed components and compounding of composite components to obtain superconcentrates.