WO2023159290A1 - Procédé de recyclage de matériaux de polyéthylène à haute et basse densité, produit lamellaire sous forme de plaque de tissu plastique et son utilisation - Google Patents

Procédé de recyclage de matériaux de polyéthylène à haute et basse densité, produit lamellaire sous forme de plaque de tissu plastique et son utilisation Download PDF

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Publication number
WO2023159290A1
WO2023159290A1 PCT/BR2023/050059 BR2023050059W WO2023159290A1 WO 2023159290 A1 WO2023159290 A1 WO 2023159290A1 BR 2023050059 W BR2023050059 W BR 2023050059W WO 2023159290 A1 WO2023159290 A1 WO 2023159290A1
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WO
WIPO (PCT)
Prior art keywords
ldpe
hdpe
density polyethylene
sheets
fabric
Prior art date
Application number
PCT/BR2023/050059
Other languages
English (en)
Portuguese (pt)
Inventor
Leonardo SZAJDENFISZ JARLICHT
Original Assignee
Szajdenfisz Jarlicht Leonardo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from BR102022003444-3A external-priority patent/BR102022003444A2/pt
Application filed by Szajdenfisz Jarlicht Leonardo filed Critical Szajdenfisz Jarlicht Leonardo
Publication of WO2023159290A1 publication Critical patent/WO2023159290A1/fr

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • 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
    • 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 invention relates to a process for recycling discarded high-density polyethylene (HDPE) and low-density polyethylene (LDPE) materials, which is carried out by means of thermal pressing.
  • the present invention also relates to the laminated product in the form of a plastic fabric sheet with specific qualities obtained by the recycling process.
  • plastic materials In recent decades, the development and use of these plastic materials has not only brought benefits, but has also caused a high increase in waste generation, mainly because these materials are used as packaging for rapid disposal. It is estimated that more than 50% of plastic materials produced are intended for single-use applications.
  • the plastics found in waste are mainly polyethylene (PE) and polyethylene terephthalate
  • Polyethylene materials can be classified according to their density:
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • PEAB - high density polyethylene
  • Ultra high molecular weight polyethylene UHMWPE
  • the most popular polyethylene materials are high density polyethylene (HDPE) and low density polyethylene (LDPE).
  • High-density polyethylene was initially developed as a packaging film.
  • HDPE high-density polyethylene
  • its use has increased a lot in several applications in the industrial sector.
  • High-density polyethylene is an unbranched linear chain polymer, translucent and characterized by its rigidity and resistance to rupture. HDPE is easily molded and has a low cost.
  • Low density polyethylene LDPE is the simplest and cheapest polymer on the market due to its high worldwide production. LDPE is a polymer that combines toughness, high impact strength, high flexibility, good processability, stability and good electrical properties. It is highly resistant to water and some aqueous solutions, even under high temperatures, but is slowly attacked by oxidizing agents. At room temperature, aliphatic, aromatic and chlorinated solvents cause swelling, and it is poorly soluble in polar solvents such as alcohols, esters and ketones.
  • LDPE manufactures films for industrial and agricultural packaging, bubble wrap, films for liquid and solid food packaging, laminated and plasticized films for food, packaging for pharmaceutical and hospital products, toys, housewares and coating for wires and cables, tubes and hoses, among others.
  • Cost reduction in the production of products by the industry It is more profitable to produce a product from recycled HDPE and LDPE than to produce it from virgin plastics.
  • PEAB and LDPE are well accepted in recycling centers, as they are polymers that are easy to recycle. Most recycling companies collect discarded products from
  • HDPE and LDPE transport them to processing facilities.
  • the Chinese publication CN111451244 proposes a specific hot melt recovery processing method for plastic bags, and additionally refers to a hot melt recovery processing device for plastic bags.
  • PP polypropylene
  • LDPE low-density polyethylene
  • HDPE High Density Polyethylene
  • the article describes a process sequence that combines cutting, tying, twisting, hot drawing and heat setting, resulting in the production of high quality polyethylene yarns. strength with mechanical properties comparable to those of melt-spun polyethylene fibers.
  • the yarns obtained can be useful in various applications, such as textiles, floors and leisure products.
  • thermoplastic plastic waste which can be melted again by heating, at a specific temperature, so that other products, as desired, can form .
  • Plastic products that can be recycled include PET (polyethylene terephthalate), HDPE
  • the present invention relates to a process for recycling high-density polyethylene (HDPE) and low-density polyethylene (LDPE) materials that is carried out by means of thermal pressing (Process called FUS ⁇ O VAIQUE) and comprises the following steps:
  • the present invention also relates to plastic fabric sheet obtained by the process.
  • the aforementioned plastic fabric sheet is a laminar product composed of 100% recycled material. Since plastic fabric sheet consists of HDPE, LDPE or a mixture of HDPE and LDPE and it has an upper surface and an opposite lower surface.
  • the present invention relates to a process for recycling high density polyethylene materials
  • HDPE high-density polyethylene
  • LDPE low-density polyethylene
  • a plastic fabric sheet is understood to be a product with a flat surface with defined dimensions of length, width and thickness, and which includes two opposing surfaces composed of HDPE, HDPE or a mixture of
  • HDPE and HDPE in different proportions.
  • the recycled HDPE and LDPE products of the present invention have characteristics that are not found in other HDPE and LDPE materials manufactured by another recycling process.
  • heat pressing is a process in which the material composed of HDPE, LDPE or the mixture of HDPE and LDPE separated is positioned in the specified quantity and color, undergoes specific heating and pressure, simultaneously, resulting in the formation of the plastic fabric sheet.
  • the recycling process begins with the collection and separation of discarded HDPE and LDPE materials, which may be mentioned in this application only as plastic materials or materials.
  • HDPE used in the present invention are market plastic bags, garbage bags; plastics used in works to cover or isolate areas, packaging for pet bottles/beers; plastic bags for gifts and trade (varied colors and sizes), fabric roll wrappers (textile industry); wrappings of clothes from production (transparent bags) among others.
  • LDPE are bubble wrap, garbage bags, plastic film, transparent/colorless supermarket bags (used to carry fruits, vegetables, legumes), industrial bags, medical serum bags, films for general use, shrink films, flexible packaging for milk or yogurt, shopping and supermarket bags, garbage bags, wrapping for plant seedlings, among others.
  • discarded materials of high density polyethylene (HDPE) and low density polyethylene (LDPE) of different origins and colors are used.
  • the discarded HDPE materials can be, but not limited to, made up of plastic market bags, garbage bags; plastics used in works (to cover/isolate places), packaging for pet bottles/beers; plastic bags for gifts and trade (varied colors and sizes), fabric roll wrappers (textile industry), clothing wrappers from production (transparent bags) .
  • the LDPE materials can be, but not limited to, garbage bags, plastic film, transparent/colorless supermarket bags (used to carry fruits, vegetables, legumes), industrial bags, medical serum bags, films for general use ; shrink films, flexible packaging for milk or yogurt, shopping and supermarket bags, garbage bags, wrapping for plant seedlings and bubble wrap.
  • the washing time can be adjusted according to the dirt condition of the collected plastic material. If necessary, additional cleaning cycles can be added to the cleaning step.
  • THE DRYING STAGE of discarded plastic material comprises two steps: (i) centrifugation of the material; and (ii) oven drying (if necessary). After washing is complete, the still wet plastic material is transferred to the centrifuge machine for drying. The plastic material goes through a cycle of 30 to 45 minutes of centrifugation for total extraction of the washing water. Then, to complete the drying process, the material is transferred to an oven. In the greenhouse, 4 to 6 lamps of 250W are used, automotive drying lamps. The number of lamps varies according to the size of the greenhouse. The material remains in the kiln for the time required for total drying, generally between 1h and 12h, depending on the amount of material that is placed in the kiln.
  • Clean and dry HDPE and LDPE waste material can be sent directly to primary separation or stored for later separation.
  • THE PRIMARY SEPARATION STAGE of plastic materials comprises 2 steps: (a) separation according to their type (HDPE and LDPE) and; (b) in the sequence are separated by color. In this step, the size of the piece of plastic is not taken into account.
  • the WEIGHING AND SECONDARY SEPARATION STEPS occur concurrently and the materials are separated and weighed according to the type and sheet of plastic fabric to be obtained. Since the sheets of plastic fabric can be: rigid sheets or more flexible sheets, which can be made up of HDPE, LDPE or a mixture of HDPE and LDPE in different proportions.
  • rigid sheets are understood to be plastic fabric sheets that have the following characteristics: greater resistance to tears, greater resistance to tension, greater final weight, less susceptible to bending.
  • more flexible sheets are understood to be plastic fabric sheets with greater flexibility when compared to rigid sheets and which have the following characteristics: more susceptible to folds/creases, more malleable, easier cutting edge, lower final weight, tensile strength, tear resistant.
  • the secondary separation of the material is more detailed for HDPE materials, as material of different colors is received.
  • the material is separated and organized according to a standard color spectrum.
  • the secondary separation occurs in a simpler way because the color spectrum is limited.
  • the weighing step is important to guarantee the type of fabric sheet formed, the final weight of the product after pressing and to ensure that the amount of material is uniform for each type of fabric sheet to be produced. Weighing is carried out on a precision scale and the weight of the discarded material used varies according to the sheet of plastic fabric to be produced.
  • THE THERMAL PRESSING STAGE in a heat press machine comprises the steps of: (a) transferring the separated and weighed discarded material to the press machine thermal; (b) adjust the temperature and time of the process according to the type of plastic sheet to be obtained; (c) application of thermal pressure for defined time and temperature; and (d) flipping the formed sheet over and repeating the step of applying thermal pressure to the other side of the formed sheet.
  • separate and heavy plastic material is transferred to the heat press machine. Since the adjustment of temperature and time to which the material will be subjected, and the type of material used and its weight are adjusted according to the type of plastic sheet of interest. Since both the rigid fabric sheets and the more flexible fabric sheets can be constituted only of HDPE or LDPE or by mixing HDPE and LDPE in different proportions.
  • the ideal weight of the discarded material used to produce the fabric sheets is the amount of material needed to produce the sheets. Since the ideal weight of discarded HDPE or LDPE material added to the machine is in the range of: 200 to 400g of HDPE or LDPE for rigid sheets containing only HDPE or LDPE; (b) 120g to 280g of HDPE for more flexible sheets containing only HDPE; and (c) 150g to 350g of LDPE for more flexible sheets containing only LDPE.
  • the plastic material to be added to the machine must be in the proportions of: (a) 0.5:2; 1:2 and 1.5:2 of LDPE and HDPE by total weight of weighed material (before pressing) to obtain stiff fabric sheets; and (b) 1:0.5; 1:1 and 1.5:1 of
  • the total weight of material to be used can vary from 180g to 400g.
  • the ideal weight of 300g to 350g of HDPE and LDPE is preferred for sheets of rigid fabric containing a mixture of HDPE and LDPE and from 200g to 250g of HDPE and LDPE for more flexible sheets of fabric containing a mixture of HDPE and LDPE. More preferably, the ideal weight of 150g of LDPE and 200g of PEAB to obtain the rigid fabric sheets and 150g of LDPE and 130g of PEAB to obtain the most flexible fabric sheets.
  • rigid sheets obtained with HDPE or LDPE have a final weight in the range of 200g to 300g.
  • the more flexible fabric sheets composed of HDPE have a final weight in the range of 180g to 210g and the more flexible fabric sheets composed of LDPE have a final weight in the range of 200g to 230g.
  • the sheets of rigid fabric and more flexible fabric, composed of a mixture of HDPE and LDPE have a final weight in the range of 200g to 300g and 200g to 230g, respectively.
  • the time and temperature at which the material will remain in the heat press machine varies for each type of plastic fabric plate that is desired to be obtained.
  • the preferred parameters for obtaining each type of plastic fabric sheet It is important to note that the pressing step can be performed up to three times for the same sheet. The need to repeat the process for the same plate is due to the need to check the integrity of the material in the intervals between steps. But preferably the process takes place twice: once for the top and once for the bottom.
  • For more flexible HDPE fabric sheets For more flexible HDPE fabric sheets:
  • Temperature- between 120°C-135°C and Time between 15s-20s being preferably the temperature of 130°C and the Time
  • LDPE fabric sheets temperature- between 125°C-135°C and Time between 10s-15s, preferably temperature 130°C and time 20s; d.
  • LDPE fabric sheets For more flexible LDPE fabric sheets:
  • HDPE and LDPE Temperature - 125°C-155°C and Time between 20s-
  • the temperature being preferably 140°C and the time 20s; f.
  • the plastic fabric sheet After carrying out the pressing process on the back, the plastic fabric sheet is finished.
  • the plastic fabric undergoes a trimmed finish and the remaining unmelted plastic is removed, configuring its dimension better.
  • VAIQUE plastic fabric sheet
  • HDPE, LDPE or a mixture of HDPE and LDPE in various proportions will comprise an upper surface and an opposite lower surface, both surfaces being smooth or textured.
  • Such a laminar product in the form of a plastic fabric sheet will have dimensions in length and width that vary between 94 cm and 100 cm in length and 64 cm and 70 cm in width, with a preferred product being a square-shaped sheet with dimensions of 100 cm by 70 cm .
  • the sheet of plastic fabric may be of a single color, or may be multicolored. This will depend on the color selection of the plastics used in the heat pressing process.
  • HDPE, LDPE or mixtures of HDPE and LDPE obtained by the previously described recycling process, covering all types of products that can be molded such as: rigid plastic fabric sheets and more flexible plastic fabric sheets and any type of product that can be produced by the described process.
  • LDPE or a mixture of recycled HDPE and LDPE produced according to the process of the present invention will present qualities that differ from other products made of different materials or from other products made from the same virgin material, such as: durability, versatility, impermeability, resistance to changes in temperature, resistance to atmospheric changes, high mechanical resistance, ease of cleaning, chemical resistance, it is texturable, it is antibacterial, and made entirely of recycled material, that is, 100% made of recycled material. These qualities confer a technical advantage over recycled products already known from the state of the art.

Abstract

La présente invention concerne un procédé de recyclage de matériaux de polyéthylène à haute densité (PEHD) et de polyéthylène à basse densité (PEBD) mis au rebut, réalisé au moyen d'un pressage thermique. Ce procédé de recyclage permet d'obtenir des produits présentant des qualités spécifiques, notamment des produits stratifiés sous forme de plaques de tissu plastique présentant des qualités spécifiques obtenues par le procédé de recyclage.
PCT/BR2023/050059 2022-02-23 2023-02-23 Procédé de recyclage de matériaux de polyéthylène à haute et basse densité, produit lamellaire sous forme de plaque de tissu plastique et son utilisation WO2023159290A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR1020220034443 2022-02-23
BR102022003444-3A BR102022003444A2 (pt) 2022-02-23 Processo para reciclagem de materiais de poletileno de alta e baixa densidade, produto laminar em forma de chapa de tecido plástico e seu uso

Publications (1)

Publication Number Publication Date
WO2023159290A1 true WO2023159290A1 (fr) 2023-08-31

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PCT/BR2023/050059 WO2023159290A1 (fr) 2022-02-23 2023-02-23 Procédé de recyclage de matériaux de polyéthylène à haute et basse densité, produit lamellaire sous forme de plaque de tissu plastique et son utilisation

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10781596B2 (en) * 2012-05-30 2020-09-22 Magma Flooring LLC Polymeric composites, resulting panels, and method for producing the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10781596B2 (en) * 2012-05-30 2020-09-22 Magma Flooring LLC Polymeric composites, resulting panels, and method for producing the same

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
AKHMAD SABARUDIN, ARENDRA ANIS, MU’ALIM: "Environmentally friendly plastic tiles for substituting wooden board, and its processing machine design", IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING, INSTITUTE OF PHYSICS PUBLISHING LTD., GB, vol. 1125, no. 1, 1 May 2021 (2021-05-01), GB , pages 012105, XP093088937, ISSN: 1757-8981, DOI: 10.1088/1757-899X/1125/1/012105 *
AKHMAD SABARUDIN, LUMINTU IDA, ARENDRA ANIS: "Development of Hot Press Molding for HDPE Recycling and Process Characterization", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY (ICST 2018), ATLANTIS PRESS, PARIS, FRANCE, 1 January 2018 (2018-01-01) - 19 October 2018 (2018-10-19), Paris, France, pages 925 - 928, XP093088939, ISBN: 978-94-625-2650-1, DOI: 10.2991/icst-18.2018.186 *
HIDALGO-SALAZAR, MIGUEL.: "Manufacturing rigid board by packaging waste containing aluminum and polyethylene", JOURNAL OF SCIENTIFIC AND INDUSTRIAL RESEARCH, vol. 70, no. 3, 2011, XP009548586 *

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