Method to produce heat insulation material from foam polyethylene wastes

FIELD: construction.

SUBSTANCE: method includes grinding of wastes into rectangular fractions with side size of 5-10 mm and their placement between two moving meshy tapes of a conveyor. Afterwards the ground wastes are heated to the temperature of 120-130°C, then passed between cooling chambers, and a continuous tape is formed from heated mass with its simultaneous foaming in area of reduced air pressure. The produced material may be duplicated.

EFFECT: method makes it possible to simplify waste processing technology, to reduce costs by provision of waste-free production of heat-insulating material in the form of a continuous tape, from which units of the specified length are cut.

1 dwg, 1 tbl, 2 ex

 

The invention relates to the technology of recycling of macromolecular substances (polymers) in a porous or cellular articles or materials and can be used for thermal insulation of walls, floors, ceilings in the construction industry.

A known method of manufacturing insulating materials using waste penopropilena [EN 2327575, CL VV 5/22, 2006], in which a heat insulating material is produced by stacking fractions of crushed foamed polyethylene (penofolom) foil tape, foam, level special device and thermally glued with blowing hot air. The molding produced using heated rolls.

This method is quite laborious and requires fairly sophisticated equipment, waste penopropilena in it are sintered and density of the source material is greatly increased, which can lead to deterioration of the insulating properties of the material as a whole.

A known method of manufacturing insulating materials [SU 1620453, CL C08J 9/228, VS 67/20, 1991], which increase the insulating properties of the material, made in the form of blocks by layer-by-layer filling the granules of thermoplastic with a blowing agent, the lower and upper layers are filled with pellets of thermoplastic in the form of shredded waste is not spenno is of polyethylene. The heat treatment is carried out by the transmission fluid (oil), preheated to 210-230°C, through the elements of thermoform. The heat treatment time 10-30 minutes prior to the foaming of polystyrene granules crushed waste to fractions of various sizes from 6.0-30,0 mm

The main disadvantages of this method are its low productivity, high cost of energy (heat is spent on heating forms), the limit of the block size of the form.

There is a method of waste plastics for the production of lightweight concrete [CN 1239109, CL C08J 11/18, 1999, And], in which waste is not biodegradable foamed polystyrene and foamed polyethylene produced sheets of a thickness of 1-8 mm or particles of irregular shape, which after degreasing mixed with cement. From waste polyethylene foam in this way is not made of insulating material, and it is used only as an additive for the manufacture of lightweight concrete.

A method of producing a heat insulating material from waste polyethylene [EN 2022781, CL 08J 9/02], including layer-by-layer form granules of a thermoplastic polypropylene polymer with a blowing agent, which is used shredded waste is not foamed polyethylene, subsequent heat treatment unit at a temperature of 210-230°C for 10-30 min, with Nizhnii the upper layers in the form of filled with granules of thermoplastic, and the middle layer is a waste of foam, when the ratio of the volume of layer-by-layer filling out the form, crushed waste foamed polyethylene and the corresponding EPS in the range of 20:60:40 to 30:40:30.

The main disadvantages of this method are its low productivity, high cost of energy (heat is spent on heating forms), the limit of the block size of the form.

The objective of the proposed method is to increase productivity, simplification of processing waste, reducing costs by providing a waste-free production of heat-insulating material in the form of a continuous ribbon of waste polyethylene and is close to the density of the primary material.

The problem is solved in that in the method for insulating material from waste polyethylene, including the shredding of waste polyethylene, waste heat and cooling, pulverized waste foam on the rectangular fraction with the size of the parties of 5-10 mm, place the shredded waste to the lower of the two parallel mesh conveyor belts, heat fraction to a temperature of 120-130°C, pass them between cameras cooled and molded from a heated mass of continuous tape and simultaneously foamed it by creating between the belts of the conveyor zone bonigen the th air pressure 0.7-0.8 bar.

A comparison of the claimed technical solution with the known solutions of the prior art has shown that it differs in that the molded material in the form of a continuous ribbon of foam cooling in the zone of reduced to 0.7-0.8 MPa air pressure, which allows judges according to the criterion of "novelty".

The method is industrially applicable, and developed technical equipment meets the criterion of inventive step, since they explicitly do not follow from the prior art.

This latter does not identify any transformations, characterized by distinctive essential characteristics, to achieve the technical result.

The essence of the method is illustrated in the drawing, which shows an exemplary diagram of a device which can be implemented in the way.

Waste polyethylene in the form of strips or sheets are ground in a rectangular faction with the parties of 5-10 mm, the Crushed waste is placed in the hopper 1 with adjustable flap from which they are evenly filled on the mesh conveyor belt 2, the waste razravnivaetsya intended for this device 3. Next, a layer of waste is covered mesh upper conveyor belt 4. Synchronous movement of the two conveyors is carried out rollers 5, which through a common gearbox connected to the motor is m Together with conveyors layer waste enters the warm-up area, representing two cameras with 6 fans. Fusion rectangular waste fractions in a continuous sheet is carried out by blowing through them at a temperature of 120-140°C air top and bottom through the mesh conveyor. Next, the resulting sheet is molded and cooled. The molded sheet is cold shafts with passive rotation 7 above mesh top and at the bottom of the lower conveyors for the heating zone. Using a vacuum pump 8 creates a zone of reduced pressure where is forming. Sheet, entering into the area of low air pressure, expanding due to the air trapped in the crushed particles of waste foam, pressed through the conveyor to the inner surfaces of the tapes of both conveyors. As a result of this clamping occurs molding surfaces of the sheet, you get a continuous ribbon of foam with properties similar to the original material.

The table below shows the characteristics of the materials: 1) polyethylene; (2) the insulating material obtained by the claimed method, where ρ is the material density in kg/m2, λ is its conductivity.

№ № Nai is inovania material. ρ, kg/m3λ, W·m/°C
1Polyethylene foam (Ref)40to 0.032
2Insulating material, obtained according to the invention48being 0.036

For the density of the original waste polyethylene adopted the average density, resulting from the mixing of waste with different density.

The resulting material can be duplicated as with tape, foam, and other materials. It can also produce heat-insulating blocks of a given length and thickness. This greatly expands the possibilities of its application.

A method for insulating material from waste polyethylene, including the shredding of waste polyethylene, waste heat and cooling, characterized in that the pulverized wastes foam on the rectangular fraction with the size of the parties of 5-10 mm, place the shredded waste to the lower of the two parallel mesh conveyor belts, heat fraction to a temperature of 120-130°C, pass them between cameras cooled and molded from a heated mass of a continuous ribbon and completion of the froth it by creating between the belts of the conveyor zone of reduced air pressure 0.7-0.8 bar.



 

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13 cl, 2 tbl, 4 ex

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25 cl, 1 dwg, 6 tbl, 2 ex

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3 cl, 1 ex, 2 tbl

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2 tbl, 1 ex

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6 cl, 2 tbl, 11 ex

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1 cl, 1 tbl, 10 ex

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