US20150299439A1 - Polymer composition from mixed plastic waste - Google Patents
Polymer composition from mixed plastic waste Download PDFInfo
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- US20150299439A1 US20150299439A1 US14/299,310 US201414299310A US2015299439A1 US 20150299439 A1 US20150299439 A1 US 20150299439A1 US 201414299310 A US201414299310 A US 201414299310A US 2015299439 A1 US2015299439 A1 US 2015299439A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
- B29B17/0042—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/30—Polymeric waste or recycled polymer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2425/02—Homopolymers or copolymers of hydrocarbons
- C08J2425/04—Homopolymers or copolymers of styrene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the present solution belongs to the field of environment-friendly recovering of plastic waste, more specifically to the field of recycling unsorted mixed plastic waste into new materials.
- Plastic packing e.g. plastic bags, plastic packing of ham, cheese, yoghurt, and other food products and consumer goods, and other plastic packing, plastic dishes
- other plastic waste box pallets, garden furniture, buckets, plastic sledges, car bumpers, canisters, pipes, bobbins, computer cases, TV sets, plastic refrigerator details, etc.
- Such solutions pollute the environment, are costly, and at the same time waste material that could be used as raw material for new applications.
- Initial sorting of waste and subsequent recycling of single-type plastics into uniform mass, granules or new products are the generally grown solutions for recycling plastic. Recycling is performed based on one specific type of plastic, e.g. LDPE, HDPE, or PET, in the course of which the sorted plastic waste is washed, broken up, dried and granulated.
- the plastic granules produced based on the recovered single-type polymer can be used by the plastics industry as raw material for manufacturing new products.
- sorting plastic waste by their types is, however, very costly and time-consuming, difficult to sort mixed plastic waste is mostly not recycled, and due to that mixed plastic waste is channelled to incineration or landfilling.
- the solution provided describes recycling of plastic waste of different types, including plastic waste of small and large volume weights, together with other materials (metal, wood, sawdust, paper, rubber, fibres) or unknown materials. It is generally known that plastics of different types mix poorly or not at all, in case of this solution yet other poorly miscible materials are added in the course of recycling. The material mixture obtained as a result is of poor quality, unstable, of non-uniform composition and low weatherproofness. Multiple-stage heating at high temperatures makes the process complicated, costly and time-consuming. This solution assumes that the recycled material containing plastics has been previously sorted. In addition to that fatty acids must be added during recycling that in turn further complicates the process.
- a polymer composition from mixed plastic waste comprising plastic waste of different types, wherein the polymer composition is obtained from recycled unidentified, uncleaned, unsorted, compacted and homogenized plastic waste of small volume weight, comprising: polyethylene (PE), approximately 50-60% of its total volume; polypropylene (PP), approximately 20-30% of its total volume; polystyrene (PS), approximately 5-10% of its total volume; and a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume.
- PE polyethylene
- PP polypropylene
- PS polystyrene
- the polymer composition from mixed plastic waste of this invention has the following properties: Density of the material in agglomerated phase: 380-450 kg/m 3 ; Density of the material in melted and solidified phase: 950-1050 kg/m 3 ; Melt flow index (g/10 min.): 1-5; Melting temperature: 165-180° C.; Color: grey; Moisture content: below 1%; Fraction size: up to 10 mm; Tensile modulus (Elongation 50 mm/min): 642.76-854.28 MPa; Tensile stress at maximum load (Elongation 50 mm/min): 14.6-17.01 MPa; Flexural modulus (Bending rate 20 mm/min): 1126-1723 Mpa; Impact strength Charpy (Hammer 4 J): 1,938-3,544 kJ/m 2 ; and Heat deflection temperature: 80-82° C.
- the polymer composition from mixed plastic waste of this invention may additionally comprise unidentified, uncleaned, unsorted, homogenized plastic waste of large volume weight so that the plastic waste content is: compacted and homogenized plastic waste of small volume weight, approximately 50-75% of the total volume, and homogenized plastic waste of large volume weight, approximately 25-50% of the total volume.
- the polymer composition from mixed plastic waste of this invention may additionally comprise unidentified, uncleaned, unsorted homogenized plastic waste of large volume weight, an additional component X, and additives Y, and wherein the polymer composition comprises: recycled plastic waste of small volume weight, approximately 55-60% of the total volume; plastic waste of large volume weight, approximately 10-20% of the total volume, and additionally polystyrene (PS), approximately 10-20% and polypropylene (PP) approximately 10-20% of the total volume, and additives Y approximately 0.2-10%.
- the additional component X may be either a single-type polymer or mixture of single-type polymers.
- the additive Y may be a pigment, UV protective agent, antioxidant, foaming agent, mineral substance, glass fibre substance and/or textile fibre substance.
- the objective of the present invention is to propose a stable and homogeneous material mixture, free from the shortcomings of the prior are, recycled from unsorted, unwashed and unidentified mixed plastic waste. More specifically, the objective of the invention is to propose a material mixture recycled from unsorted, unwashed, unidentified plastic waste with small and large volume weights.
- the traditional polymer recycling process handles polymeric raw materials that are accurately identified and have very clear properties characteristic to polymers of a specific type.
- the polymer composition from mixed plastic waste of the present invention comprises mixtures of different polymer materials, including mixtures of not accurately identified recovered polymer materials, keeping the production process stable and simultaneously fulfilling the requirements established for end material being produced.
- the polymer composition of the present solution can be used as raw material for manufacturing various plastic products, e.g. terrace tables, matchboards, furniture, fence modules, noise barrier systems, building and finishing materials, etc.
- plastic products e.g. terrace tables, matchboards, furniture, fence modules, noise barrier systems, building and finishing materials, etc.
- the polymer material waste is not separated by types, and distinguishing between plastic household waste of different colours is not necessary. This enables valuation of plastic waste several hundred times more highly than by their one-time incineration as waste fuel, landfilling, utilising as filling material or in some other way.
- the advantage of the polymer composition of the present invention over other currently known solutions is the fact that plastic waste is recycled without involving a specific polymer sorting process, counterweighting the plastic products thrown on the market.
- the end products manufactured of the polymer composition recycled from unidentified mixed plastic waste according to the solution of the present invention are weatherproof, maintenance-free and fully recyclable again after decades of use, thus creating a new “endless” usage cycle for plastic waste.
- Profiles manufactured of the polymer composition of the present invention can be widely used and utilised as a basis for creating certified product groups like noise barriers, terrace systems and other building systems; when applying this process, wood resources are spared by adopting maintenance-free and more weatherproof products as an alternative.
- the plastic waste is collected and sorted separately by specific polymer types.
- the present solution does not distinguish different polymer types for producing the polymer composition.
- Plastics of small and large volume weights are separated in the course of collecting the waste to achieve the objective, after that non-plastics like glass, metal, textiles, paper, wood, aluminium, copper, sand, etc. are separated from both sets of plastics, and the mixed plastic waste is then recycled to a homogeneous polymer mixture by breaking up, compacting and granulating. Thereat plastic waste is not separated by polymer types.
- Plastics of smaller volume weight (0.1-0.15 (up to 0.4) t/m 3 ) are, e.g. light volatile plastic packing created in households like plastic bags, plastic packing of ham, cheese, yoghurt and other food products or consumer goods, etc. This plastic packing forms the most problematic and continuously growing type of plastic waste that can today mainly be either landfilled or incinerated.
- this group of plastics of small volume weight averagely comprises: PE 50-60% of the total volume; PP 20-30% of the total volume; PS 5-10% of the total volume; other unidentified plastics (e.g. PA, PET, POM, PC, PET, composite plastics, etc.) 1-10% of the total volume.
- Plastics of large volume weight are plastic waste of household or industrial origin, requiring utilisation. These are, e.g. discarded box pallets, garden furniture, buckets, plastic sledges, car bumpers, canisters, pipes, bobbins, computer cases, TV sets, plastic refrigerator details, etc.
- this group comprises, e.g.: PS; PP; PE (LDPE and HDPE); HIPS; ABS; PC; PS/PP (compounds); PP/HD (compounds); MIX plastics (a quantity of plastics where determining the type of plastic has not succeeded).
- FIG. 1 presents unidentified, uncleaned, unsorted mixed plastic waste of small volume weight
- FIG. 2 presents the compacted and homogenized fraction of the polymer composition of the present invention according to the preferred embodiment, recycled from mixed plastic waste presented in FIG. 1 ;
- FIG. 3 presents unidentified, uncleaned, unsorted mixed plastic waste of large volume weight
- FIG. 4 presents the compacted and homogenized fraction of the polymer composition of the present invention according to an alternative embodiment, recycled from mixed plastic waste presented in FIG. 3 ;
- FIG. 5 presents the fraction of the polymer mixture composition of the present invention according to another alternative embodiment, recycled from mixed plastic waste presented in FIG. 2 and FIG. 4 ;
- FIG. 6 presents a sample product profile obtained from the polymer composition of the present invention presented in FIG. 5 ;
- FIG. 7 presents the congealed molten mass (mixture A 1 ) of the polymer composition of the present invention presented in FIG. 2 ;
- FIG. 8 presents the congealed molten mass (mixture A 2 ) of the polymer composition of the present invention presented in FIG. 2 ;
- FIG. 9 presents the congealed molten mass of the single-type identified polypropylene plastic, known from the state of the art.
- FIG. 10 presents the congealed molten mass of the polymer composition of the present invention presented in FIG. 5 ;
- FIG. 11 presents the block diagram of the process for obtaining the polymer composition of the present invention from the mixed plastic waste.
- the polymer composition of the present invention from mixed plastic waste comprises a homogeneous polymer mixture recycled from unsorted, unidentified, uncleaned plastic waste of different densities, various colours, small volume weight and/or large volume weight.
- the polymer composition of the present invention presented in FIG. 2 from compacted and homogenized mixed plastic waste comprises plastic waste of different types, and according to the preferred embodiment the polymer composition is obtained from recycled unidentified, uncleaned, unsorted plastic waste of small volume weight, containing:
- the properties of the polymer composition are as follows.
- the unidentified plastic material portion of the polymer composition comprises, e.g. polyamides (PA), Polyethylene terephthalate (PET), Polyacetal (POM), Polycarbonate (PC).
- PA polyamides
- PET Polyethylene terephthalate
- POM Polyacetal
- PC Polycarbonate
- the composition comprises unidentified, uncleaned, unsorted, homogenized plastic waste of large volume weight:
- the composition additionally comprises recycled unidentified, uncleaned, unsorted, plastic household waste of large volume weight, whereas the recycled plastic waste of large volume weight comprises polypropylene (PP), HD polyethylene (HDPE), LD polyethylene (LDPE), polystyrene (PS), ABS, PET, PS/PP compounds, PP/HD compounds, other unidentified types of plastic material.
- PP polypropylene
- HDPE high polyethylene
- LDPE LD polyethylene
- PS polystyrene
- ABS PET
- PS/PP compounds polystyrene
- PP/HD compounds polystyrene
- FIGS. 7 and 8 The examples of such embodiment are presented in FIGS. 7 and 8 , whereas larger PET content is evident in FIG. 7 in the form of unmelted pieces.
- the composition comprises a mixture of recycled unidentified, uncleaned, unsorted plastic household waste of small and large volume weights, with a component X and additives Y added to it, whereas the component X is preferably either a single-type polymer or a mixture of single-type polymers made up from polystyrene (PS) and polypropylene (PP), chosen from a sorted source, and having been added in such a ratio that the polymer composition obtained comprises:
- PS polystyrene
- PP polypropylene
- the properties of the polymer composition are as follows.
- additives Y e.g. pigments in PE-carrier, UV protective agents, antioxidants, foaming agent, mineral and structure supplementing additives, glass fibre substances, textile fibre substances and/or mineral additives have been added.
- the composition should comprise a sufficient quantity of polymers of similar properties and similar molecular formulas.
- these are polystyrene and polypropylene, with the preferred content in the composition being 5-15%.
- the composition is obtained from plastic waste of small volume weight has 70-90% of PE/PP, having a similar molecular formula. The molten mass of the plastics with similar molecular formulas will dominate when melted.
- the polymer composition is obtained from plastic waste of large volume weight also has 70-90% of PE/PP, having a similar molecular formula. The molten mass of the plastics with similar molecular formulas will dominate when melted.
- Components X and additives Y are additionally added as substances controlling the subsequent production process as appropriate, i.e. the behaviour of the molten plastic mass is controlled through them in the course of recycling the composition.
- PS polystyrene
- a foaming agent When, e.g. a foaming agent is added by manufacturing products from the polymer composition of the present invention, formation of gases in the molten plastic mass is stimulated, at the time of its cooling the gases start to expand, and seek a way out from the molten plastic mass.
- the volume weight of the end product can be changed by varying the dosages of the foaming agent.
- the gases start to expand, and seek a way out from the molten plastic mass.
- Polypropylene moves within the surface layers of the molten mass during the process, binding the former mass of similar molecular formula with itself, and momentarily forming a layer non-permeable to gases, when coming into contact with the cold calibrator wall.
- Polystyrene moves within the middle layers of the molten mass.
- PS polystyrene
- the congealing rate of polystyrene (PS) is higher than that of the rest of the mass, and it is located in the middle layers of the molten mass, a structure not allowing the product being manufactured no longer to collapse, is created at the time of cooling.
- Sufficient mixing of polystyrene (PS) and the rest of the molten plastic mass in the molten state and under pressure takes place at the same time, ensuring the homogeneity, and preserving porous content for the product, that in turn yields ca. 0.5-0.8 t/m 3 as the density of the profile.
- polystyrene (PS) and/or polypropylene (PP) is additionally added to the polymer composition, obtained from the unidentified, uncleaned, and unsorted plastic household waste mixture of small and large volume weights of the present invention.
- PS polystyrene
- PP polypropylene
- a test specimen of very good quality, obtained with a test melting equipment can be seen in case of the embodiment presented in FIG. 8 .
- the surface structure is uniform, with light gloss. This indicates the pureness and quality of mixture A.
- polystyrene (PS) and polypropylene (PP) are additionally added to the mixture, approximately 5% of both.
- FIG. 2 presents the polymer composition of the present invention.
- Granulated plastic waste obtained by recycling a single-type polymer could have a similar appearance.
- the differences between the polymer composition of the present invention, and a granulated single-type polymer are clearly evident when comparing their hardened molten masses.
- Hardened molten masses of the preferred embodiment of the polymer composition of the present invention are presented in FIG. 7 and FIG. 8 . Less uniform fusing due to the foreign matter (sand, organic matter, soil, dust, paper) present in the plastic mixture is clearly visible. Virtually no gloss is evident. The test specimen can be broken in half by hand.
- Hardened molten mass of similar appearance obtained from a single-type polymer is presented in FIG. 9 for comparison.
- the hardened molten mass has been obtained from sorted and washed single-type plastic material, more specifically polypropylene (PP).
- PP polypropylene
- the test specimen corresponding to mixture C is presented in FIG. 10 .
- the quality of mixture C is primarily assessed visually.
- the test specimen shown in FIG. 9 has been used as reference. The more uniform the fusing quality, the higher the quality of mixture C, that directly affects the efficiency of the production process, to achieve the product shown in FIG. 6 .
- FIG. 11 presents the block diagram of the process for obtaining the polymer composition of the present invention from the mixed plastic waste.
- the polymer composition of the present invention, obtained from mixed plastic waste comprises a homogeneous polymer mixture recycled from unsorted, unidentified, uncleaned plastic waste of different densities, various colours, small volume weight and large volume weight.
- Plastic waste of small volume weight Collected plastic waste of small volume weight, separated from other waste flows, and pressed together, are conveyed to the plastic waste recycling line where preliminary breaking up is performed; after that non-plastic waste is separated (e.g. by way of magnetic and air separation), and the preliminarily broken-up mixture of plastic waste is routed to recycling.
- the plastic waste is also mixed during the separation.
- Plastic waste of small volume weight is compacted in the course of recycling as plastics of this type have large cubages and are light volatile. Additional disintegration is performed during the compacting process, accompanied by continuous mixing and heating of the plastic mixture, until melting of the plastic mixture.
- the plastics are dirty, other organic or inorganic material, still remaining in the plastic waste after the preceding separation of the non-plastic waste, is also destroyed or melted into uniform mass in the course of the breaking up, mixing and heating process.
- the compacting process is completed by quick cooling of the obtained mixture, and subsequent breaking up of the hardened mass to a fraction having a size of approximately 1 to 10 mm, preferably 5.1 to 10 mm.
- the agglomerate obtained is then routed to homogenisation.
- the volume of the plastic mixture is compacted approximately ten times in the course of this process.
- the mass of plastic waste transformed to the molten state in the course of the compacting process is rapidly cooled.
- cooled water preferably at the temperature of approximately 4° C. to 10° C., is added to it, resulting in the molten mass hardening within a short space of time.
- the blades of the compacting equipment initially used to break up the plastic mixture and mix the molten mass, start to break up the hardened mass. Breaking up is performed until obtaining an agglomerate of uniform fraction.
- the compacting system reduces the cubage of plastic waste, increases their density, mixes the plastic waste in the molten state, destroys the organic and bacterial material, and creates a stable material mixture, with a fraction size of approximately 3 to 10 mm, and moisture content below 1%, suitable for the subsequent production process.
- a device with its blade system equipped with the drive and power unit sufficient to operate the blade system during the mixing and breaking up various plastic materials, and after that during the breaking up of the mass of hardened plastics, has been used as the compacting system.
- the blades of the blade system have been designed so as to enable them to break up the plastic waste mixture, mix this mixture in its molten state, and also function as the disintegrating mechanism after cooling the melted mass until its hardening.
- the temperature of the agglomerate obtained is approximately 115° C. to 165° C. when conveyed out of the compacting system.
- the agglomerate obtained is routed to drying and homogenisation, in the course of which the material mixture is mixed through, and a material of uniform properties is obtained.
- the material passes through an additional cooling cycle lasting several hours, during which the material is mixed, and gradually cooled, this way stabilising the properties of the polymers for the subsequent production cycle.
- the after-cooler is designed to preserve the plastic properties and fraction of the material.
- the material is conveyed to the homogenisation system where mixing of the material takes place.
- the homogenisation system comprises a container mixer of at least 28 m 3 , enabling to mix the materials with each other, and homogenise the raw material mixture by batches of at least 10 to 15 tons.
- inflow of warm air has been added to the container mixer of the present solution, to also achieve efficient drying along with the mixing.
- Plastic waste of large volume weight Collected plastic waste of large volume weight, separated from other waste flows, and pressed together, is broken up, non-plastic waste is separated from it, it is dried, if necessary, and homogenized.
- Plastic waste of higher density (from 0.4 tons per m 3 ) is broken up to a fraction of 3 to 10 mm in the course of the production process.
- the polymer materials are mixed in large quantities starting from 5 tons in the drying mixer tower and homogenisation tower.
- the homogenisation process unifies the properties of the polymers, and the drying process decreases the moisture content of the materials below 1%.
- inflow of warm air has been added to the drying mixer tower to obtain the polymer mixture of the present invention, so efficient drying would also be achieved along with the mixing.
Abstract
A polymer composition from mixed plastic waste is disclosed. The composition comprises plastic waste of different types obtained from recycled unidentified, uncleaned, unsorted, compacted and homogenized plastic waste. Preferably the plastic waste comprises polyethylene (PE), approximately 50-60% of its total volume; polypropylene (PP), approximately 20-30% of its total volume; polystyrene (PS), approximately 5-10% of its total volume; a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume. The mixture of unidentified plastics comprises polyamides (PA), Polyethylene terephthalate (PET), Polyacetal (POM), and Polycarbonate (PC).
Description
- This application claims priority of European application number EP 14165118, filed on Apr. 17, 2014 and the contents of which is fully incorporated herein by reference.
- The present solution belongs to the field of environment-friendly recovering of plastic waste, more specifically to the field of recycling unsorted mixed plastic waste into new materials.
- As the use of plastic products is very widespread, reuse of the plastic waste represents a huge challenge. Plastic packing (e.g. plastic bags, plastic packing of ham, cheese, yoghurt, and other food products and consumer goods, and other plastic packing, plastic dishes) and other plastic waste (box pallets, garden furniture, buckets, plastic sledges, car bumpers, canisters, pipes, bobbins, computer cases, TV sets, plastic refrigerator details, etc.) form the most problematic and continuously growing type of waste, that according to common solutions can today be mainly landfilled, incinerated or used as filling material. Such solutions pollute the environment, are costly, and at the same time waste material that could be used as raw material for new applications.
- Initial sorting of waste and subsequent recycling of single-type plastics into uniform mass, granules or new products are the generally grown solutions for recycling plastic. Recycling is performed based on one specific type of plastic, e.g. LDPE, HDPE, or PET, in the course of which the sorted plastic waste is washed, broken up, dried and granulated. The plastic granules produced based on the recovered single-type polymer can be used by the plastics industry as raw material for manufacturing new products. As sorting plastic waste by their types is, however, very costly and time-consuming, difficult to sort mixed plastic waste is mostly not recycled, and due to that mixed plastic waste is channelled to incineration or landfilling.
- As far as known, no suitable solution has been found for recycling polymers of different types. When comparing polymer materials to other materials like glass and metals, the polymers of a plastic need longer processes to enable their recovery. The biggest problem is posed by the fact that polymers of different types are immiscible with each other because of their different molecular weights and long polymer chains. Heating the polymers is not sufficient for decomposing polymer molecules; therefore, the polymers to be recovered must often have identical compositions to achieve effective mixing. When plastics of different types are simultaneously melted together, they usually do not mix—like oil and water—and will lie in layers.
- Because of such problems the unsorted waste of mixed plastics remains unused by the plastics industry; also sorting plastic waste from households and other consumers by their types is very costly or almost impossible. Standard plastics industries manufacturing hundred millions tons of plastic products to be used, are configured to work with virgin, or initial single-type plastic granules (LDPE, HDPE, PS, PP, PET, AB, composites, (PS/PP, PP/PE, PS/PC), HIPS, EPS, PA, POM, PC, etc.), and their technological production solutions are not capable of handling mixed and contaminated plastic waste.
- The scientific base known up to now does not support effective solutions for mixing different and recovered polymers; the opinion that this cannot be achieved has become dominant.
- Experiments attempting to recycle mixed plastic waste of different types are known from the state of the art. Such solutions, however, also involve sorting and/or adding of other materials during the recycling process, to facilitate better binding of the mixture obtained by recycling. For example, a solution involving recycling of different waste into granules is known from the international patent application WO2012009005. Wastewater and several other types of waste are added to plastic waste according to this solution. The material obtained using this solution is not homogeneous. International patent application WO0238276 describes a process and device for recycling plastic household waste, but the solution requires preliminary cleaning and sorting of the plastics.
- The process described in U.S. Pat. No. 6,274,637B1 for producing a material mixture from mixed plastics, plastic waste or other unidentified or known plastics, and manufacturing products from it by mixing, breaking up, thermal processing, and moulding/cooling can be considered the closest known solution from the state of the art. According to this solution pre-sorted plastic materials, other substances, and additives (fatty acids are used) are mixed together. The mixture of all components is thermally processed in the course of up to twelve-stage and up to 400° C. heating cycle, and the outcoming mass is either cooled or conveyed to product manufacturing. This solution uses either an extruder or injection moulding machine device. The fraction size of the material produced by recycling is 0.1 to 5 mm. The solution provided describes recycling of plastic waste of different types, including plastic waste of small and large volume weights, together with other materials (metal, wood, sawdust, paper, rubber, fibres) or unknown materials. It is generally known that plastics of different types mix poorly or not at all, in case of this solution yet other poorly miscible materials are added in the course of recycling. The material mixture obtained as a result is of poor quality, unstable, of non-uniform composition and low weatherproofness. Multiple-stage heating at high temperatures makes the process complicated, costly and time-consuming. This solution assumes that the recycled material containing plastics has been previously sorted. In addition to that fatty acids must be added during recycling that in turn further complicates the process. Only one embodiment has been provided as an example: a product manufactured from cable waste, and a mixture of PVC, PE and rubber granules. No other process parameters aside from temperature ranges have been specified for the solution provided, including, e.g. pressure, time or other conditions to be monitored during the process.
- Considering the properties of the materials listed for the solution provided, and the incomplete process specification, such solution is not practicable according to the opinion of a person skilled in the art.
- The biggest shortcoming of the prior art solutions is producing an extremely unstable mass by mixing and melting different plastics, that cannot be managed by the currently known plastic processing process, let alone enable a stable raw material to be achieved and finished products to be manufactured from it.
- A polymer composition from mixed plastic waste is disclosed where the composition comprises plastic waste of different types, wherein the polymer composition is obtained from recycled unidentified, uncleaned, unsorted, compacted and homogenized plastic waste of small volume weight, comprising: polyethylene (PE), approximately 50-60% of its total volume; polypropylene (PP), approximately 20-30% of its total volume; polystyrene (PS), approximately 5-10% of its total volume; and a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume.
- The polymer composition from mixed plastic waste of this invention has the following properties: Density of the material in agglomerated phase: 380-450 kg/m3; Density of the material in melted and solidified phase: 950-1050 kg/m3; Melt flow index (g/10 min.): 1-5; Melting temperature: 165-180° C.; Color: grey; Moisture content: below 1%; Fraction size: up to 10 mm; Tensile modulus (Elongation 50 mm/min): 642.76-854.28 MPa; Tensile stress at maximum load (Elongation 50 mm/min): 14.6-17.01 MPa; Flexural modulus (Bending rate 20 mm/min): 1126-1723 Mpa; Impact strength Charpy (Hammer 4 J): 1,938-3,544 kJ/m2; and Heat deflection temperature: 80-82° C.
- The polymer composition from mixed plastic waste of this invention may additionally comprise unidentified, uncleaned, unsorted, homogenized plastic waste of large volume weight so that the plastic waste content is: compacted and homogenized plastic waste of small volume weight, approximately 50-75% of the total volume, and homogenized plastic waste of large volume weight, approximately 25-50% of the total volume.
- The polymer composition from mixed plastic waste of this invention may additionally comprise unidentified, uncleaned, unsorted homogenized plastic waste of large volume weight, an additional component X, and additives Y, and wherein the polymer composition comprises: recycled plastic waste of small volume weight, approximately 55-60% of the total volume; plastic waste of large volume weight, approximately 10-20% of the total volume, and additionally polystyrene (PS), approximately 10-20% and polypropylene (PP) approximately 10-20% of the total volume, and additives Y approximately 0.2-10%. The additional component X may be either a single-type polymer or mixture of single-type polymers. The additive Y may be a pigment, UV protective agent, antioxidant, foaming agent, mineral substance, glass fibre substance and/or textile fibre substance.
- The objective of the present invention is to propose a stable and homogeneous material mixture, free from the shortcomings of the prior are, recycled from unsorted, unwashed and unidentified mixed plastic waste. More specifically, the objective of the invention is to propose a material mixture recycled from unsorted, unwashed, unidentified plastic waste with small and large volume weights.
- The traditional polymer recycling process handles polymeric raw materials that are accurately identified and have very clear properties characteristic to polymers of a specific type. The polymer composition from mixed plastic waste of the present invention comprises mixtures of different polymer materials, including mixtures of not accurately identified recovered polymer materials, keeping the production process stable and simultaneously fulfilling the requirements established for end material being produced.
- The polymer composition of the present solution can be used as raw material for manufacturing various plastic products, e.g. terrace tables, matchboards, furniture, fence modules, noise barrier systems, building and finishing materials, etc. Unlike known solutions, according to the present solution the polymer material waste is not separated by types, and distinguishing between plastic household waste of different colours is not necessary. This enables valuation of plastic waste several hundred times more highly than by their one-time incineration as waste fuel, landfilling, utilising as filling material or in some other way.
- The advantage of the polymer composition of the present invention over other currently known solutions is the fact that plastic waste is recycled without involving a specific polymer sorting process, counterweighting the plastic products thrown on the market. The end products manufactured of the polymer composition recycled from unidentified mixed plastic waste according to the solution of the present invention are weatherproof, maintenance-free and fully recyclable again after decades of use, thus creating a new “endless” usage cycle for plastic waste. Profiles manufactured of the polymer composition of the present invention can be widely used and utilised as a basis for creating certified product groups like noise barriers, terrace systems and other building systems; when applying this process, wood resources are spared by adopting maintenance-free and more weatherproof products as an alternative.
- In the conventional plastic waste recycling process the plastic waste is collected and sorted separately by specific polymer types. The present solution does not distinguish different polymer types for producing the polymer composition.
- Plastics of small and large volume weights are separated in the course of collecting the waste to achieve the objective, after that non-plastics like glass, metal, textiles, paper, wood, aluminium, copper, sand, etc. are separated from both sets of plastics, and the mixed plastic waste is then recycled to a homogeneous polymer mixture by breaking up, compacting and granulating. Thereat plastic waste is not separated by polymer types.
- Plastics of smaller volume weight (0.1-0.15 (up to 0.4) t/m3) are, e.g. light volatile plastic packing created in households like plastic bags, plastic packing of ham, cheese, yoghurt and other food products or consumer goods, etc. This plastic packing forms the most problematic and continuously growing type of plastic waste that can today mainly be either landfilled or incinerated. Statistically this group of plastics of small volume weight averagely comprises: PE 50-60% of the total volume; PP 20-30% of the total volume; PS 5-10% of the total volume; other unidentified plastics (e.g. PA, PET, POM, PC, PET, composite plastics, etc.) 1-10% of the total volume.
- Plastics of large volume weight (>0.4 t/m3) are plastic waste of household or industrial origin, requiring utilisation. These are, e.g. discarded box pallets, garden furniture, buckets, plastic sledges, car bumpers, canisters, pipes, bobbins, computer cases, TV sets, plastic refrigerator details, etc. Statistically this group comprises, e.g.: PS; PP; PE (LDPE and HDPE); HIPS; ABS; PC; PS/PP (compounds); PP/HD (compounds); MIX plastics (a quantity of plastics where determining the type of plastic has not succeeded).
- The present invention is explained more precisely with references to figures added, where:
-
FIG. 1 presents unidentified, uncleaned, unsorted mixed plastic waste of small volume weight; -
FIG. 2 presents the compacted and homogenized fraction of the polymer composition of the present invention according to the preferred embodiment, recycled from mixed plastic waste presented inFIG. 1 ; -
FIG. 3 presents unidentified, uncleaned, unsorted mixed plastic waste of large volume weight; -
FIG. 4 presents the compacted and homogenized fraction of the polymer composition of the present invention according to an alternative embodiment, recycled from mixed plastic waste presented inFIG. 3 ; -
FIG. 5 presents the fraction of the polymer mixture composition of the present invention according to another alternative embodiment, recycled from mixed plastic waste presented inFIG. 2 andFIG. 4 ; -
FIG. 6 presents a sample product profile obtained from the polymer composition of the present invention presented inFIG. 5 ; -
FIG. 7 presents the congealed molten mass (mixture A1) of the polymer composition of the present invention presented inFIG. 2 ; -
FIG. 8 presents the congealed molten mass (mixture A2) of the polymer composition of the present invention presented inFIG. 2 ; -
FIG. 9 presents the congealed molten mass of the single-type identified polypropylene plastic, known from the state of the art; -
FIG. 10 presents the congealed molten mass of the polymer composition of the present invention presented inFIG. 5 ; -
FIG. 11 presents the block diagram of the process for obtaining the polymer composition of the present invention from the mixed plastic waste. - The polymer composition of the present invention from mixed plastic waste comprises a homogeneous polymer mixture recycled from unsorted, unidentified, uncleaned plastic waste of different densities, various colours, small volume weight and/or large volume weight.
- The polymer composition of the present invention presented in
FIG. 2 , from compacted and homogenized mixed plastic waste comprises plastic waste of different types, and according to the preferred embodiment the polymer composition is obtained from recycled unidentified, uncleaned, unsorted plastic waste of small volume weight, containing: -
- polyethylene (PE), approximately 50-60% of its total volume;
- polypropylene (PP), approximately 20-30% of its total volume;
- polystyrene (PS), approximately 5-10% of its total volume;
- a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume.
- The properties of the polymer composition are as follows.
-
- Density of the material in agglomerated phase: 380-450 kg/m3
- Density of the material in melted and solidified phase: 950-1050 kg/m3
- Melt flow index (g/10 min.): 1-5, preferably 2.5-3.5
- Melting temperature: 165-180° C.
- Color: grey
- Moisture content: below 1%
- Fraction size: up to 10 mm
- Tensile modulus (Elongation 50 mm/min): 642.76-854.28 MPa
- Tensile stress at maximum load (Elongation 50 mm/min): 14.6-17.01 MPa
- Flexural modulus (Bending rate 20 mm/min): 1126-1723 MPa
- Impact strength Charpy (Hammer 4 J): 1,938-3,544 kJ/m2
- Heat deflection temperature: 80-82° C.
- The unidentified plastic material portion of the polymer composition comprises, e.g. polyamides (PA), Polyethylene terephthalate (PET), Polyacetal (POM), Polycarbonate (PC). According to an alternative embodiment of the polymer composition of the present invention from mixed plastic waste, the composition comprises unidentified, uncleaned, unsorted, homogenized plastic waste of large volume weight:
-
- polyethylene (PE), approximately 50-60% of its total volume;
- polypropylene (PP), approximately 20-30% of its total volume;
- PS, ABS, PC, HIPS, approximately 5-10% of its total volume;
- mixture of unidentified plastic and other materials (e.g. sand, soil, organics, etc.), approximately 1-10% of its total volume.
- According to the alternative embodiment of the polymer composition of the present invention from mixed plastic waste, the composition additionally comprises recycled unidentified, uncleaned, unsorted, plastic household waste of large volume weight, whereas the recycled plastic waste of large volume weight comprises polypropylene (PP), HD polyethylene (HDPE), LD polyethylene (LDPE), polystyrene (PS), ABS, PET, PS/PP compounds, PP/HD compounds, other unidentified types of plastic material. The approximate plastic waste content of this polymer composition is as follows:
-
- recycled plastic waste of small volume weight, approximately 50-75% of the total volume, and
- plastic waste of large volume weight, approximately 25-50% of the total volume.
- The examples of such embodiment are presented in
FIGS. 7 and 8 , whereas larger PET content is evident inFIG. 7 in the form of unmelted pieces. - According to an alternative embodiment of the polymer composition of the present invention, the composition comprises a mixture of recycled unidentified, uncleaned, unsorted plastic household waste of small and large volume weights, with a component X and additives Y added to it, whereas the component X is preferably either a single-type polymer or a mixture of single-type polymers made up from polystyrene (PS) and polypropylene (PP), chosen from a sorted source, and having been added in such a ratio that the polymer composition obtained comprises:
-
- recycled plastic waste of small volume weight, approximately 50-75%, and preferably 55-60% of the total volume;
- recycled plastic waste of large volume weight, approximately 10-50%, and preferably 10-25% of the total volume, and additionally;
- polystyrene (PS), approximately 5-20% (preferably 5-15%) of the total volume, and polypropylene (PP) approximately 5-20% (preferably 5-15%) of the total volume, and
- additives Y approximately 0.2-10%, preferably 1-5%.
- The properties of the polymer composition are as follows.
-
- Density of the material: 979-1026 kg/m3
- Melt flow index (g/10 min.) approximately 2-5
- Melting temperature: 165-180° C.
- Tensile modulus (Elongation 50 mm/min): 794.97-864.70
- Tensile stress at maximum load (Elongation 50 mm/min): 18.11-21.04 MPa
- Flexural modulus (Bending rate 20 mm/min):
- Impact strength Charpy (Hammer 4 J): 1,348-1,938 kJ/m2
- Heat deflection temperature: 79-81° C.
- As the additives Y, e.g. pigments in PE-carrier, UV protective agents, antioxidants, foaming agent, mineral and structure supplementing additives, glass fibre substances, textile fibre substances and/or mineral additives have been added.
- To make plastic materials of different types mix with each other in the course of subsequent recycling of the composition of the present invention, the results of experiments have shown that the composition should comprise a sufficient quantity of polymers of similar properties and similar molecular formulas. According to the most preferable embodiment these are polystyrene and polypropylene, with the preferred content in the composition being 5-15%.
- The composition is obtained from plastic waste of small volume weight has 70-90% of PE/PP, having a similar molecular formula. The molten mass of the plastics with similar molecular formulas will dominate when melted. The polymer composition is obtained from plastic waste of large volume weight also has 70-90% of PE/PP, having a similar molecular formula. The molten mass of the plastics with similar molecular formulas will dominate when melted.
- Due to that, when the mixture obtained from plastic waste of large volume weight (presented in
FIG. 4 ) is additionally added to the composition obtained from plastic waste of small volume weight (presented inFIG. 2 ), then by melting such a polymer composition of the alternative embodiment of the present invention (presented inFIG. 5 ), the molten mass of the plastics with similar molecular formulas will dominate. - Components X and additives Y are additionally added as substances controlling the subsequent production process as appropriate, i.e. the behaviour of the molten plastic mass is controlled through them in the course of recycling the composition.
- Experiments have shown the property of the polypropylene (PP) to move within the surface layers of the mass molten in the course of the recycling process of the mixed plastic waste composition, binding the previous mass of polymers of similar molecular formulas, obtained on the basis of plastic waste of small and large volume weights. The product surface is formed when coming into contact with the wall of the product cooling mould, non-permeable to gases.
- Experiments have shown the property of polystyrene (PS) to move within the middle layers of the molten mass of the mixed plastic waste composition. As the cooling rate of polystyrene (PS) is higher than that of the rest of the mass of the mixed plastic waste composition, and polystyrene (PS) is located in the middle layers of the molten mass, cooling the product will create a product structure not allowing the product to collapse.
- Sufficient mixing of polystyrene (PS) and the rest of the molten plastic mass in the molten state of the polymer composition of the present invention and under pressure, ensuring the homogeneity and durability of the product, preserves porous content for the product, and this in turn yields ca. 0.5-0.8 t/m3 as the potential density of the product.
- When, e.g. a foaming agent is added by manufacturing products from the polymer composition of the present invention, formation of gases in the molten plastic mass is stimulated, at the time of its cooling the gases start to expand, and seek a way out from the molten plastic mass. The volume weight of the end product can be changed by varying the dosages of the foaming agent. At the time of cooling the gases start to expand, and seek a way out from the molten plastic mass. Polypropylene moves within the surface layers of the molten mass during the process, binding the former mass of similar molecular formula with itself, and momentarily forming a layer non-permeable to gases, when coming into contact with the cold calibrator wall. Polystyrene moves within the middle layers of the molten mass. As the congealing rate of polystyrene (PS) is higher than that of the rest of the mass, and it is located in the middle layers of the molten mass, a structure not allowing the product being manufactured no longer to collapse, is created at the time of cooling. Sufficient mixing of polystyrene (PS) and the rest of the molten plastic mass in the molten state and under pressure takes place at the same time, ensuring the homogeneity, and preserving porous content for the product, that in turn yields ca. 0.5-0.8 t/m3 as the density of the profile.
- To improve the quality, polystyrene (PS) and/or polypropylene (PP) is additionally added to the polymer composition, obtained from the unidentified, uncleaned, and unsorted plastic household waste mixture of small and large volume weights of the present invention. For example, according to the embodiment presented in
FIG. 7 , polystyrene (PS) and polypropylene (PP) are additionally added to the mixture, approximately 12% of both. - A test specimen of very good quality, obtained with a test melting equipment can be seen in case of the embodiment presented in
FIG. 8 . The surface structure is uniform, with light gloss. This indicates the pureness and quality of mixture A. In case of such embodiment polystyrene (PS) and polypropylene (PP) are additionally added to the mixture, approximately 5% of both. -
FIG. 2 presents the polymer composition of the present invention. Granulated plastic waste, obtained by recycling a single-type polymer could have a similar appearance. The differences between the polymer composition of the present invention, and a granulated single-type polymer are clearly evident when comparing their hardened molten masses. - Hardened molten masses of the preferred embodiment of the polymer composition of the present invention are presented in
FIG. 7 andFIG. 8 . Less uniform fusing due to the foreign matter (sand, organic matter, soil, dust, paper) present in the plastic mixture is clearly visible. Virtually no gloss is evident. The test specimen can be broken in half by hand. - Hardened molten mass of similar appearance, known from the state of the art, obtained from a single-type polymer is presented in
FIG. 9 for comparison. In this case the hardened molten mass has been obtained from sorted and washed single-type plastic material, more specifically polypropylene (PP). The quality of fusing is clearly visible, no lumpiness is evident, the mass of plastic has congealed uniformly. Very hard to break by hand. - The test specimen corresponding to mixture C is presented in
FIG. 10 . The quality of mixture C is primarily assessed visually. The test specimen shown inFIG. 9 has been used as reference. The more uniform the fusing quality, the higher the quality of mixture C, that directly affects the efficiency of the production process, to achieve the product shown inFIG. 6 . -
FIG. 11 presents the block diagram of the process for obtaining the polymer composition of the present invention from the mixed plastic waste. The polymer composition of the present invention, obtained from mixed plastic waste comprises a homogeneous polymer mixture recycled from unsorted, unidentified, uncleaned plastic waste of different densities, various colours, small volume weight and large volume weight. - Collected plastic waste of small volume weight, separated from other waste flows, and pressed together, are conveyed to the plastic waste recycling line where preliminary breaking up is performed; after that non-plastic waste is separated (e.g. by way of magnetic and air separation), and the preliminarily broken-up mixture of plastic waste is routed to recycling. The plastic waste is also mixed during the separation. Plastic waste of small volume weight is compacted in the course of recycling as plastics of this type have large cubages and are light volatile. Additional disintegration is performed during the compacting process, accompanied by continuous mixing and heating of the plastic mixture, until melting of the plastic mixture. As the plastics are dirty, other organic or inorganic material, still remaining in the plastic waste after the preceding separation of the non-plastic waste, is also destroyed or melted into uniform mass in the course of the breaking up, mixing and heating process.
- The compacting process is completed by quick cooling of the obtained mixture, and subsequent breaking up of the hardened mass to a fraction having a size of approximately 1 to 10 mm, preferably 5.1 to 10 mm. The agglomerate obtained is then routed to homogenisation.
- The volume of the plastic mixture is compacted approximately ten times in the course of this process. The mass of plastic waste transformed to the molten state in the course of the compacting process is rapidly cooled. For example cooled water, preferably at the temperature of approximately 4° C. to 10° C., is added to it, resulting in the molten mass hardening within a short space of time.
- The blades of the compacting equipment, initially used to break up the plastic mixture and mix the molten mass, start to break up the hardened mass. Breaking up is performed until obtaining an agglomerate of uniform fraction.
- The compacting system reduces the cubage of plastic waste, increases their density, mixes the plastic waste in the molten state, destroys the organic and bacterial material, and creates a stable material mixture, with a fraction size of approximately 3 to 10 mm, and moisture content below 1%, suitable for the subsequent production process. For example, a device with its blade system equipped with the drive and power unit sufficient to operate the blade system during the mixing and breaking up various plastic materials, and after that during the breaking up of the mass of hardened plastics, has been used as the compacting system. The blades of the blade system have been designed so as to enable them to break up the plastic waste mixture, mix this mixture in its molten state, and also function as the disintegrating mechanism after cooling the melted mass until its hardening. Further, a heating mechanism is additionally added to the compacting system, if required. As a result of the high temperature created in the course of the compacting system process, the temperature of the agglomerate obtained is approximately 115° C. to 165° C. when conveyed out of the compacting system.
- The agglomerate obtained is routed to drying and homogenisation, in the course of which the material mixture is mixed through, and a material of uniform properties is obtained. Unlike the generally known processes that route the compacted clean single-type polymer materials to subsequent regranulate production, according to the present invention the material passes through an additional cooling cycle lasting several hours, during which the material is mixed, and gradually cooled, this way stabilising the properties of the polymers for the subsequent production cycle.
- The after-cooler is designed to preserve the plastic properties and fraction of the material. After the after-cooling, the material is conveyed to the homogenisation system where mixing of the material takes place. The homogenisation system comprises a container mixer of at least 28 m3, enabling to mix the materials with each other, and homogenise the raw material mixture by batches of at least 10 to 15 tons. Unlike known container mixers, inflow of warm air has been added to the container mixer of the present solution, to also achieve efficient drying along with the mixing.
- Collected plastic waste of large volume weight, separated from other waste flows, and pressed together, is broken up, non-plastic waste is separated from it, it is dried, if necessary, and homogenized. Plastic waste of higher density (from 0.4 tons per m3) is broken up to a fraction of 3 to 10 mm in the course of the production process. The polymer materials are mixed in large quantities starting from 5 tons in the drying mixer tower and homogenisation tower. The homogenisation process unifies the properties of the polymers, and the drying process decreases the moisture content of the materials below 1%. Unlike known container mixers, inflow of warm air has been added to the drying mixer tower to obtain the polymer mixture of the present invention, so efficient drying would also be achieved along with the mixing.
- After compacting and homogenisation of the mixed plastic waste of small volume weight, and homogenisation of the plastic waste of large volume weight, mixing of the plastic waste of small volume weight and the plastic waste of large volume weight is performed to obtain the polymer composition of the invention, whereas the percentage of the material mixture produced from the plastic waste of small volume weight is approximately from 50% to 75%, and the percentage of the material mixture produced from the plastic waste of large volume weight is approximately from 25% to 50%.
Claims (11)
1. A polymer composition from mixed plastic waste, comprising plastic waste of different types, wherein the polymer composition is obtained from recycled unidentified, uncleaned, unsorted, compacted and homogenized plastic waste of small volume weight, comprising:
polyethylene (PE), approximately 50-60% of its total volume;
polypropylene (PP), approximately 20-30% of its total volume;
polystyrene (PS), approximately 5-10% of its total volume; and
a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume.
2. The polymer composition from mixed plastic waste according to claim 1 , wherein the polymer composition has the following properties:
Density of the material in agglomerated phase: 380-450 kg/m3;
Density of the material in melted and solidified phase: 950-1050 kg/m3;
Melt flow index (g/10 min.): 1-5;
Melting temperature: 165-180° C.;
Color: grey;
Moisture content: below 1%;
Fraction size: up to 10 mm;
Tensile modulus (Elongation 50 mm/min): 642.76-854.28 MPa;
Tensile stress at maximum load (Elongation 50 mm/min): 14.6-17.01 MPa;
Flexural modulus (Bending rate 20 mm/min): 1126-1723 Mpa;
Impact strength Charpy (Hammer 4 J): 1.938-3.544 kJ/m2; and
Heat deflection temperature: 80-82° C.
3. The polymer composition from mixed plastic waste according to claim 1 , wherein the mixture of unidentified plastics comprises polyamides (PA), Polyethylene terephthalate (PET), Polyacetal (POM), and Polycarbonate (PC).
4. The polymer composition from mixed plastic waste according to claim 1 , wherein the composition additionally comprises unidentified, uncleaned, unsorted, homogenized plastic waste of large volume weight so that the plastic waste content is:
compacted and homogenized plastic waste of small volume weight, approximately 50-75% of the total volume, and
homogenized plastic waste of large volume weight, approximately 25-50% of the total volume.
5. The polymer composition from mixed plastic waste according to claim 1 , wherein the composition additionally comprises unidentified, uncleaned, unsorted homogenized plastic waste of large volume weight, an additional component X, and additives Y, and wherein the polymer composition comprises:
recycled plastic waste of small volume weight, approximately 55-60% of the total volume;
plastic waste of large volume weight, approximately 10-20% of the total volume, and additionally
polystyrene (PS), approximately 10-20% and polypropylene (PP) approximately 10-20% of the total volume, and
additives Y approximately 0.2-10%.
6. The polymer composition from mixed plastic waste according to claim 5 , wherein the polymer composition has the following properties:
Density of the material: 979-1026 kg/m3;
Melt flow index (g/10 min.): 2-5;
Melting temperature: 165-180° C.;
Tensile modulus (Elongation 50 mm/min): 794.97-864.70;
Tensile stress at maximum load (Elongation 50 mm/min): 18.11-21.04 Mpa;
Flexural modulus (Bending rate 20 mm/min);
Impact strength Charpy (Hammer 4 J): 1.348-1.938 kJ/m2; and
Heat deflection temperature: 79-81° C.
7. The polymer composition from mixed plastic waste according to claim 5 , wherein the homogenized plastic waste of large volume weight comprises polypropylene (PP), HD polyethylene (HDPE), LD polyethylene (LDPE), polystyrene (PS), ABS, PET, PS/PP compounds, PP/HD compounds, and other unidentified types of plastic material.
8. The polymer composition from mixed plastic waste according to claim 5 , wherein the component X is either a single-type polymer or mixture of single-type polymers.
9. The polymer composition from mixed plastic waste according to claim 5 , wherein the additive Y is a pigment, UV protective agent, antioxidant, foaming agent, mineral substance, glass fiber substance and/or textile fibre substance.
10. The polymer composition from mixed plastic waste, comprising plastic waste of different types, wherein the polymer composition is obtained from recycled unidentified, uncleaned, unsorted, homogenized plastic household waste of large volume weight.
11. The polymer composition from mixed plastic waste according to claim 10 , wherein the homogenized plastic waste of large volume weight comprises polypropylene (PP), HD polyethylene (HDPE), LD polyethylene (LDPE), polystyrene (PS), ABS, PET, PS/PP compounds, PP/HD compounds, and other unidentified types of plastic material.
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US15/237,647 Active US10301448B2 (en) | 2014-04-17 | 2016-08-16 | Polymer composition from mixed plastic waste |
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US11407016B2 (en) * | 2018-05-22 | 2022-08-09 | Louis Structures, LLC | Structural fill-materials from solid waste and method to produce |
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CA3110723A1 (en) * | 2018-09-07 | 2020-03-12 | 10942731 Canada Corporation | Method and system for forming a composite material |
US20230066052A1 (en) * | 2021-08-12 | 2023-03-02 | Tina Richter | Compositions and Methods for the Recycling of a Mixed Plastic Feedstock |
CH719093A1 (en) | 2021-10-27 | 2023-05-15 | Boxs Ag | Process and apparatus for producing a foamed polymer composite panel from mixed plastic waste. |
Citations (1)
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US6191228B1 (en) * | 1999-01-27 | 2001-02-20 | Polywood Inc. | Use of recycled plastics for preparing high performance composite railroad ties |
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DE3715646A1 (en) * | 1987-05-11 | 1988-11-24 | Hans Heinlein | Process for disposing of, reprocessing and reclaiming plastic wastes and floor-covering element or similar mould parts produced by this means |
US5075057A (en) * | 1991-01-08 | 1991-12-24 | Hoedl Herbert K | Manufacture of molded composite products from scrap plastics |
DE19625110A1 (en) | 1996-06-17 | 1997-12-18 | Finacor Anstalt | Plastic recycling process and process for the production of plastic materials |
US6494390B1 (en) * | 2000-05-24 | 2002-12-17 | Northwestern University | Solid state shear pulverization of multicomponent polymeric waste |
WO2002038276A1 (en) | 2000-11-01 | 2002-05-16 | Yash Vasant Joshi | Method for direct recycling of plastic wastes |
CN1659225B (en) * | 2002-04-12 | 2012-06-27 | Mba聚合物公司 | Multistep separation of plastics |
US20090029074A1 (en) * | 2004-10-11 | 2009-01-29 | John Sasine | Method and process for collecting and processing recyclable waste |
KR101017714B1 (en) * | 2006-04-27 | 2011-02-25 | 신닛뽄세이테쯔 카부시키카이샤 | Method of molding waste plastic and method of pyrolyzing waste plastic |
US8568645B2 (en) | 2010-07-12 | 2013-10-29 | Darrel S. Nelson | Method of making structural members using waste and recycled plastics |
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- 2014-06-09 US US14/299,310 patent/US20150299439A1/en not_active Abandoned
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US6191228B1 (en) * | 1999-01-27 | 2001-02-20 | Polywood Inc. | Use of recycled plastics for preparing high performance composite railroad ties |
Cited By (1)
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US11407016B2 (en) * | 2018-05-22 | 2022-08-09 | Louis Structures, LLC | Structural fill-materials from solid waste and method to produce |
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US10301448B2 (en) | 2019-05-28 |
US20160355663A1 (en) | 2016-12-08 |
EP2933289A1 (en) | 2015-10-21 |
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