Patent EA-003826-B1 (EA)
Title: Material and method and device for producing the same
Inventor: MANES MICHAEL
IPC: C04B40/00
Filed: 2001-06-19
Abstract: 1. A method for producing a material which consists essentially of sand and polymers as well as optionally, a small quantity of aggregates, comprising the following steps: heating sand to a temperature between 300 to 800 degree C; supplying heated sand and polymer into a closed mixing container (7) provided with a ground electrodes (10)and a safety valve (9)with maintaining the mixing temperature, which is above the polymer melting temperature; mixing sand and polymer for producing a hot molten mixture; introducing said molten mixture into a mould (12); cooling the molten mixture under pressure until the molten mixture hardens in the mould; further cooling the hardened material at a normal pressure. 2. The method according to claim 1, characterized in that polymers are added into the heated sand with continuous aggregation the mixture, until the polymer content reaches 15-50% of the total molten mixture mass. 3. The method according to claim 1, characterized in that polymers are added into the heated sand with continuous aggregation the mixture, until the polymer content reaches 50-85% of the total molten mixture mass. 4. The method according to one of claims 1 to 3, characterized in that the molten mixture is cooled in the pressing mold (12) to a temperature between 60 to 100 degree C under pressure of 1 to 40 kPa. 5. The method according to one of claims 1 to 4, characterized in that prior to producing hot molten mixture polymer wastes are reduced to obtain polymer granulate. 6. The method according to one of claims 1 to 4, characterized in that sieved sand is used of 0.5 to 0.9 mm in size. 7. The method according to claim3, characterized in that prior to adding to polymers the heated sand is electrically discharged. 8. The method according to one of claims 1 to 7, characterized in that the polymer is heated to melting prior to mixing with sand. 9. The method according to one of claims 1 to 8, characterized in that one or several following aggregates are added into the hot molten mixture: organic or inorganic fibres; dyes; chemical softeners; plasticizers; lubricating agents; silicates. 10. The method according to one of claims 1 to 8, characterized in that during the step of cooling and prior to hardening the material solid elements are added into molten mixture for fixing them geometrically and forcingly in the material. 11. The method according to one of claims 1 to 10, characterized in that it is used to obtain one of the following subjects: electrical engineering elements, elements for floor coatings, manhole covers for underground channels. 12. A device for carrying out the method according to one of claims 1 to 11, comprising: a container (1) for storing sand and a container (2) for storing polymer; a hopper (3) for bulk materials into which the sand from the container (1) is supplied together, heat carrier (5) having heating contact surfaces(4) on which the sand is heated; a metering device (6) for receiving polymer from the container (2) and heated sand from the hopper (3) in predetermined quantities; a mixing tank (7), into which the predetermined quantities of sand and are supplied and mixed therein and discharged therefrom as a molten mixture; a ground electrode (10) disposed in the mixing container (7) for discharging electrostatic potentials a safety valve (9) disposed in the mixing chamber (7) guarding against an excess pressure in the mixing container; a mould (12) in which the molten mixture is cooled under pressure to hardened state.