Method to produce heat insulation material from foam polyethylene wastes
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/m3||λ, W·m/°C|
|1||Polyethylene foam (Ref)||40||to 0.032|
|2||Insulating material, obtained according to the invention||48||being 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.
SUBSTANCE: invention relates to binder for co-extrusion based on a mixture of co-grafted polyolefins, as well as a multilayer structure containing the binder. The binder contains a mixture of at least homo- or copolymer of ethylene (A1), having density 0.940-0.980 g/cm3, and at least one copolymer of propylene (B) containing at least 51 wt % propylene. (Co)polymers of the said mixture are co-grafted with a functional monomer selected from carboxylic acids and their derivatives. The degree of graft polymerisation of the extrusion binder is more than 0.05 wt % and less than 0.5 wt % of the total weight of the said binder. The mixture is possibly diluted in at least a homo- or copolymer of ungrafted ethylene (A2). Said binder has density of 0.940-0.980 g/cm3.
EFFECT: disclosed binder has sufficient fluidity, high resistance to peeling of layers at temperature higher than 80°C, and is meant for use in a multilayer structure for protecting metal surfaces and for making packaging, rigid hollow housings, particularly bubbles or bottles, or flexible reservoirs, as well as multilayer films.
13 cl, 2 tbl, 4 ex
SUBSTANCE: invention relates to a polyolefin moulding composition with higher resistance to thermal-oxidative decomposition and is especially suitable for making pipes which are in prolonged thermal contact with liquids which contain oxidative disinfection substances. The moulding composition contains thermoplastic polyolefin and an organic polyoxy compound in amount of 0.01-1.0% of the total weight of the moulding composition, with general chemical formula R-[(CH2)n-O]m-H, where n is an integer from 1 to 10; m is an integer from 3 to 500 and R is a hydrogen atom, or an OH- group or an alkyl group containing 1-10 carbon atoms and which can additionally have substitutes such as OH, -COOH, -COOR, -OCH3 or -OC2H5. The moulding composition can also contain an unsaturated aliphatic hydrocarbon in amount of up to 5 wt %.
EFFECT: moulding composition has good processability when making pipes and endows pipes made from the composition with higher thermal stability and high rupture resistance combined with improved organoleptic properties.
9 cl, 1 tbl, 5 ex
SUBSTANCE: invention relates to use of an antioxidant to increase resistance of a polyolefin composition meant for making pipes to decomposition caused by contact with water, which contains CIO2. The antioxidant is selected from a) a group of phenols of formula I, where R is an unsubstituted or substituted aliphatic or aromatic hydrocarbon radical which can contain heteroatoms, or R is a heteroatom, R' and R" independently denote an unsubstituted or substituted hydrocarbon radical which can contain heteroatoms, or H, X1, X2 and X3 independently denote an unsubstituted or substituted hydrocarbon radical which can contain heteroatoms, or H or OH, where at least X1, X2 or X3 is OH, n assumes values from 1 to 4, and at least one of the phenol substitutes R, R' and/or R" contains at least one sulphur, phosphorus and/or nitrogen heteroatom or from b) amine compounds of formula II, where R1, R2, R3, R4, R5 and R6 independently denote a hydrogen atom or an aliphatic or aromatic hydrocarbon radical, possibly containing heteroatoms, or selected from c) sulphur-containing compounds of formula Ra-S-Rb III, where Ra and Rb independently denote an aliphatic or aromatic hydrocarbon radical, possibly containing heteroatoms.
EFFECT: antioxidant used has low susceptibility to extraction with water carried by a pipe made from such a polyolefin composition.
7 cl, 1 tbl, 2 ex
SUBSTANCE: invention relates to a polyethylene composition for making pipes, which contains a polymer base comprising two polyethylene fractions with different molecular weight, to a pipe containing said composition and to use of said composition to make articles, preferably pipes. The polymer base accounts for not less than 90 wt % of the overall composition and has density of 932-938 kg/m3.The fraction of ethylene homo- or copolymer (A) has lower average molecular weight than the fraction of ethylene homo- or copolymer. The polyethylene composition has melt flow rate MFR5 between 0.1 and 0.6 g/10 min and shearing stress η2.7 kPa between 85 and 230 kPa. The polyethylene composition has improved combination of properties, particularly high flexibility, high mechanical strength and good long-term stability.
EFFECT: pipes obtained from the disclosed polyethylene composition have good operational characteristics, long-term stability and good resistance to rapid propagation of cracks, which facilitates their use in conveying liquids under pressure.
16 cl, 1 tbl, 3 ex
SUBSTANCE: thermoplastic material, having a polyethylene matrix which contains 1-70 pts. wt polypropylene per 100 pts. wt polyethylene matrix, is used to make medical and hygienic films. After heating, said material is passed through a pressing zone between cooled rollers, where the initial film-type linen is heated to molten state of the material of the polyethylene matrix but not up to temperature of molten polypropylene.
EFFECT: inproved operational characteristics of film-type linen including for films with thickness equal to less than 20 mcm.
25 cl, 1 dwg, 6 tbl, 2 ex
SUBSTANCE: invention relates to a polyethylene moulding composition for pressure casting finished parts, for example bottle tops and bottles, and to a method of preparing said moulding composition. The composition has polymodal molecular weight distribution and contains an ethylene homopolymer (A) with low molecular weight, an ethylene copolymer (B) with high molecular weight an ethylene copolymer (C) with ultrahigh molecular weight. At temperature 23°C, the moulding composition has density of 0.948-0.957 g/cm3, melt flow rate MFR (190°C/2.16 kg) of 1-2.7 dg/min and coefficient of viscosity VN3 of the mixture of ethylene homopolymer A, copolymer B and ethylene copolymer C, measured in accordance with ISO/R 1191 in decalin at temperature 135°C ranging from 150 to 240 cm3/g.
EFFECT: besides processability, the moulding composition has high mechanical strength and rigidity, excellent organoleptic properties and high cracking resistance under the effect of the surrounding medium.
12 cl, 2 tbl, 2 ex
SUBSTANCE: polymer base is not less than 90 wt % of the overall composition and has density of 940-947 kg/m3.The fraction of homo- or copolymer of ethylene (A) has lower average molecular weight than the fraction of homo- or copolymer of ethylene. The polyethylene composition has melt flow rate MFR5 of 0.1-0.5 g/10 min and viscosity reduction index during shear (2.7/210) of 10-49, has better combination of properties, in particular high flexibility and high mechanical strength and good long-term stability.
EFFECT: pipes made from the disclosed polyethylene composition have good performance properties, especially in terms of flexibility and rapid propagation of cracks while preserving minimal required strength, processing characteristics, impact viscosity and resistance to slow propagation of cracks.
14 cl, 1 tbl, 3 ex
SUBSTANCE: composition contains a mixture of a low molecular weight polyethylene component and a high molecular weight polyethylene component and a binding agent containing at least 0.0025 wt % polysulphonyl azide. The mixture has sine peak on the lamella thickness distribution (LTD) curve.
EFFECT: prolonged wear resistance of pipes under gas or water pressure, resistance to cracking under stress associated with environmental factors, resistance to slow formation of cracks, to fast crack propagation and to creep under internal stress.
64 cl, 3 dwg, 24 tbl, 6 ex
SUBSTANCE: film is made from a composition having multi-modal molecular-weight distribution and density between 0.940 and 0.948 g/cm3. The composition contains 40-60 wt % of a first fraction of an ethylene polymer made from a homopolymer A, 25-45 wt % of a second fraction of ethylene polymer made from a first copolymer B of ethylene and at least one first comonomer from a group of olefins having 4-8 carbon atoms and 10-30 wt % of a third fraction of ethylene polymer made from a second copolymer C of ethylene and at least one second comonomer from a group of olefins having 4-8 carbon atoms. The first copolymer B of ethylene has molecular weight which is less than that of the second copolymer C of ethylene, but greater than that of homopolymer A.
EFFECT: disclosed thin films have improved mechanical properties, particularly impact resistance when testing the films using a falling pointed load, with high rate of collection without deterioration of stability of the molten bubble.
12 cl, 2 tbl, 3 ex
SUBSTANCE: invention relates to a polyethylene moulding composition having multi-modal molecular-weight distribution, especially suitable for films made via extrusion blowing, having thickness between 8 and 200 mcm. The polyethylene moulding composition has density between 0.953 and 0.960 g/cm3 and MFR190/5 of the end product after extrusion between 0.10 and 0.50 dg/min. The composition contains 42-52 wt % of a first fraction of ethylene polymer made from a homopolymer A, having a first molecular weight, 27-38 wt % of a second fraction of ethylene polymer made from another homopolymer or a first copolymer B of ethylene and at least one first comonomer from a group of olefins having 4-8 carbon atoms,whereby the first copolymer B has a second molecular weight greater than the said first molecular weight, and 15-25 wt % of a third fraction of ethylene polymer made from a second copolymer C having a third molecular weight greater than the second molecular weight.
EFFECT: disclosed polyethylene moulding composition enables to obtain thin films with improve processing properties without deterioration of mechanical properties.
12 cl, 2 tbl, 3 ex
SUBSTANCE: invention relates to polymer foamed materials which absorb energy when a vehicle collides with obstacles, such as other vehicles. In particular, the invention pertains to an energy absorbing structural component which contains an amorphous thermoplastic cellular polymer which is a polystyrene polymer or a polystyrene copolymer which is in contact with the structural component, in which at least approximately 50% of the cells of the amorphous cellular polymer are closed and have average gas pressure between approximately 0.5 atm and approximately 1.4 atm at ambient temperature. The invention also relates to a method of making the energy absorbing structural component, involving: (a) mixing the amorphous thermoplastic polymer, which is a polystyrene polymer or polystyrene copolymer, and a foaming agent, (b) preparation of moulded polymer foamed material from the mixture of the polymer, which is a polystyrene polymer or polystyrene copolymer, and the foaming agent, in which the foamed material has at least approximately 50% closed cells, (c) processing the moulded foamed material such that closed cells have gas pressure between approximately 0.5 atm and approximately 1.4 atm in order to obtain processed moulded foamed material, and (d) attaching the processed moulded foamed material to the structural component to obtain an energy absorbing structural component.
EFFECT: obtaining foamed materials which absorb energy of a vehicle, which are cheap, are lightweight, have high energy absorption and can withstand the internal medium of an automobile.
43 cl, 5 ex, 1 tbl, 2 dwg
SUBSTANCE: described is a method for continuous production of products from foamed polystyrene, involving mixing a monomer with a blowing agent and functional additives, polymerisation of the reaction mixture. The method is distinguished by that the styrene monomer is premixed with a carbon dioxide blowing agent taken in liquid-phase supercritical state. Polymerisation is carried out in a frontal polymerisation reactor. Pressure at the output of the reactor is then dropped sharply, leading to foaming of the polymer mass, after which the obtained foamed polymer mass is injected into the mould of the product with its subsequent cooling. Also described is a device for realising the said method, where the said device has a monomer container, an inert gas container, a carbon dioxide container and a carbon dioxide flowmetre, mixers, a plunger pump, a compressor, a cryostat, an aerator for mixing the monomer with carbon dioxide, a frontal polymerisation reactor, a fine adjustment throttle valve, a mould and a condenser.
EFFECT: high-output, energy-saving, environmentally safe continuous method of making products from foamed polystyrene.
3 cl, 1 dwg, 1 tbl
SUBSTANCE: invention relates to the thermoplastic resin particles designed for forming the Styrofoam containers. The foaming thermoplastic resin particles are described, consisting of polymer obtained from the vinyl aromatic monomers, and bearing on their surface the covering composition at approximately 0.005 to 2.0 mass percent at particle mass. At that, the said covering composition includes the components selected from the group consisting of 1) liquid part and 2) solid part; and the said liquid part contains: a) from approximately 0.01 to 0.8 mass percents at a particles mass of polyethylene glycol with the apparent molecular weight from approximately 200 to 800; the said solid part contains the components selected from the group consisting of b) from approximately 0.01 to 1.0 mass percent at a mass of the polyolefin wax particles; c) from approximately 0.01 to 0.6 mass percent at a mass of the particles of the metal-containing salt of the higher fatty acids; d) from approximately 0.01 to 0.8 mass percents at a particles mass of polyethylene glycol with the apparent molecular weight from approximately 900 to 10000; and e) from approximately 0.01 to 0.1 mass percent at a mass of the fatty bisamide particles; and their combinations. Also, the styrofoam container and the formed article produced from the said foaming particles, are described. The covering composition for the said particles and the method for improvement the leakage resistance in the styrofoam container, are described.
EFFECT: prevention of oil and/or fat-containing liquid and food leakage, edge firmness improvement.
31 cl, 10 tbl, 10 ex
SUBSTANCE: invention relates to chemical industry, specifically to extraction of polyolefins from solutions in organic solvents and can be used to process polymer wastes. Described is a method of extracting components from solutions of polyolefins in organic solvents, involving cooling the solution, separating the polymer at excess pressure of 15-45 mm Hg and condensation of the solvent vapour at temperature 0-5°C, in which the solution of the polymer with concentration of 20-50% is continuously extruded through a draw plate with a circular cross section at a rate of 0.001-0.05 m/s while simultaneously cooling to temperature lower than the melting point of the polymer in the presence of the initial organic solvent.
EFFECT: possibility of carrying out a continuous process with fewer process steps due to exclusion of processes for drying the product and decantation of liquids and creating a cheaper process through exclusion of steps for heating the suspension and drying the product, which require extra equipment and power consumption.
1 tbl, 1 ex
SUBSTANCE: method of processing rubber-containing wastes or a mixture of rubber-containing and polymer wastes involves a preparation step, where the wastes are crushed with addition of abrasive materials and saturated with an organosilicon solvent whose boiling point is not higher than 80°C; a chemical decomposition step which is carried out in an alkaline medium at temperature 50-60°C for 8-12 hours; and a phase separation step.
EFFECT: efficient processing of rubber-containing wastes to obtain a liquid product which can be used as silicon-containing material for various production processes.
1 cl, 1 ex
SUBSTANCE: method of processing elastomeric wastes from production of high-moisture carbon-chain synthetic rubber involves dehydration in a closed rubber mixer, extrusion machine or an assembly with additional hot air blowing, unloading and processing on rollers. Spent bentonite and diatomite from production of plant oil are then added, cooled and an elastomeric composition having moisture content of not more than 2.0%, Mooney viscosity of 40-70 arbitrary units is obtained. The obtained product is further used in preparing rubber mixtures.
EFFECT: improved environmental friendliness, low cost of rubber mixtures.
2 tbl, 6 ex
SUBSTANCE: invention relates to method for thermal processing polymer components of worn-out car tyres, involving their loading into a reactor, pyrolysis in a gas medium with subsequent separation of pyrolysis products and unloading the solid residue. Crushed polymer components of worn-out car tyres are treated with an aqueous solution of cobalt chloride in amount of cobalt chloride of 2% of the weight of polymer components and subsequent drying of the treated material at room temperature. Pyrolysis is carried out in a nitrogen medium at atmospheric pressure at 450-460°C for 1.0-1.5 hours.
EFFECT: invention increases output of gaseous and liquid pyrolysis products, and increases heating capacity of the gaseous products.
3 cl, 1 ex, 2 tbl
SUBSTANCE: invention relates to processing rubber-containing wastes, particularly to recycling worn-out tyre casings and industrial rubber articles. The method of processing waste industrial rubber articles involves dissolving rubber crumbs in a naphthalene fraction of coal-tar resin by mixing a mixture of the components in a sealed container at 220-230°C for 15-30 minutes using microwave radiation at frequency of 2450 MHz and power of 450 W, in the following ratio of components of the mixture in wt %: rubber crumbs 10-40, naphthalene fraction of coal-tar resin - the rest.
EFFECT: improved environmental friendliness and reduced cost of the process, obtaining rubber-containing composite material with high adhesion to different surfaces.
2 tbl, 1 ex
SUBSTANCE: invention relates to a method of processing a regenerated polycondensation polymer for repeated use. The method involves supply of the used polycondensation polymer, selected from polyester or polyamide in molten state in a polymerisation container fitted with a porous plate having from 5 to 105 pores, where the said plate has cross sectional area from 0.01 to 100 cm2 and thickness from 0.1 to 300 mm. After releasing the polycondensation polymer through pores of the porous plate, the degree of polymerisation of the polycondensation polymer is increased at low pressure or in an atmosphere of an inert gas at low pressure of 50000 Pa or less while simultaneously lowering the polycondensation polymer along the carrying body in any form of wire, chain, grid, cubic lattice, thin film, porous plate and column formed as a result of piling filler of the right shape.
EFFECT: increased efficiency of the method combined with low expenses while preserving high quality of the processed polymer at the same time.
6 cl, 2 tbl, 11 ex
SUBSTANCE: method is described for processing polyethyleneterephthalate (PET) wastes, involving thermal treatment of the wastes in a sealed volume in a medium of a mixture of vapours released from the PET wastes during thermal treatment and atmospheric air in the volume, under the condition that 160°C ≤ t < 200°C and excess pressure of vapour and air is equal to 1.5-4.5 kgf/cm2, for 20-40 hours.
EFFECT: proposed method enables to obtain a powder product with particle size of 5-50 mcm, having high solubility in an alkaline solution and low degree of thermal decomposition.
1 cl, 1 tbl, 10 ex