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WO1998009785A1 - Moulage unitaire solide - Google Patents

Moulage unitaire solide Download PDF

Info

Publication number
WO1998009785A1
WO1998009785A1 PCT/GB1997/002346 GB9702346W WO9809785A1 WO 1998009785 A1 WO1998009785 A1 WO 1998009785A1 GB 9702346 W GB9702346 W GB 9702346W WO 9809785 A1 WO9809785 A1 WO 9809785A1
Authority
WO
WIPO (PCT)
Prior art keywords
waste material
resin
mould
blending
blend
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/GB1997/002346
Other languages
English (en)
Inventor
Peter Thomas
Peter Leonard Jacobs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STRUMAT INTERNATIONAL Corp Ltd
Original Assignee
STRUMAT INTERNATIONAL Corp Ltd
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
Application filed by STRUMAT INTERNATIONAL Corp Ltd filed Critical STRUMAT INTERNATIONAL Corp Ltd
Priority to AU41239/97A priority Critical patent/AU4123997A/en
Publication of WO1998009785A1 publication Critical patent/WO1998009785A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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 the manufacture of unitary solid mouldings, and products made therefrom.
  • building elements or structural materials which comprise industrial or domestic waste bonded together by means of adhesive.
  • building elements or structural materials are breeze blocks (ashes and coal or coke bonded together with cement) , chipboard (woodchips bonded together with an adhesive) and synthetic slates (slate dust bonded together by means of adhesive) .
  • thermoplastics processing industry by-product material results from the production or processing of the thermoplastic materials. Providing an individual thermoplastic material can be kept free of contamination with other thermoplastics, it may be recycled for further processing and is therefore not waste material.
  • thermoplastics there are generally significant problems in processing mixtures of different types of thermoplastics.
  • polyethylene has very different processing characteristics to those of polyethylene terephthalate (PET) , both of which are common in food packaging.
  • PET polyethylene terephthalate
  • a method for improving the stiffness of such commingled plastics (mixed plastics waste) is disclosed in the Society of Plastic Engineering Annual Technical Conference 1995, Volume 53, Number 3, Pages 3752 to 3756.
  • the process disclosed is a continuous process and requires the application of external heat in order to enable a moulded body to be produced. This gives rise to the disadvantage that the process cannot be carried out away from an industrial processing plant.
  • the principal aim of the present invention is to provide a method of manufacturing a unitary solid moulding from waste material, using a batch process, which method can be easily carried out in the field.
  • a method of manufacturing a unitary solid moulding which method comprises :
  • waste material denotes any material that would normally have no further economic use, or would be dumped, in for example, a landfill, if the material were not used in the method according to the present invention.
  • the waste material may be industrial or domestic waste.
  • the resulting moulding is no longer thermoplastic in nature; it has the characteristics of a cured thermoset material.
  • the properties of the resulting element may be tailored depending on the nature of the thermoplastics present; for example, if a significant quantity of flexible thermoplastics is present, then the resulting moulding may have a degree of flexibility.
  • the resultant blend of step (d) is transferred to a mould prior to step (e) , preferably within thirty minutes of completion of blending in step (d) .
  • the receptacle may also function as the mould.
  • the blending in step d) is typically carried out in the receptacle by a tumbling action, or by means of a high speed mixer.
  • the high speed mixer comprises a blade, paddle or the like which is shaped to entrain air into the mix during the blending in step d) .
  • Such lightweight mouldings may be suitable as, for example, pallets or the like.
  • the amount of polyester resin present typically does not exceed 50% by weight of the mix.
  • the waste material may be pulverised to a particle size of less than 10mm.
  • the size of particles may be selected depending on the properties required; typically the waste material has an average particle size in the range of 1 to 3mm.
  • the thermoplastics preferably have respective softening temperatures typically not more than 250°C.
  • the thermoplastics are typically two or more types of plastics selected from ABS, polystyrene (for example high impact polystyrene) , unplasticised PVC, one or more polyolefins (such as polyethylene or polypropylene) , polyethylene terephthalate or other polyester, or a relatively low melting polyamid ' e.
  • thermosettable polyester resin used in the method according to the invention is selected so as to be capable of undergoing exothermic cure, preferably to generate a temperature up to approximately 250°C in the mould. Because a thermosettable polyester resin is used which undergoes exothermic cure, it is not necessary to apply external heating; the heat generated by the curing of the polyester resin is sufficient to soften the waste material and render the thermoplastics processable in the mould.
  • at least the interior of the receptacle is of a material to which the blend is substantially non-adhesive.
  • the receptacle may advantageously be a drum dimensioned to be received in a cement mixer, which removes the necessity to provide a completely purpose-designed machine. It is preferred that such a drum is lined with stainless steel or polypropylene.
  • the blend may be moulded in an open mould or, alternatively, under pressure (for example, with a weight acting on top of the blending mould, or under compression from a hydraulic ram or the like) .
  • the finely divided waste material should be substantially dry; if there is water present in the mixed thermoplastics, the amount may be minimised by size reduction. If necessary, further heating can be applied and/or a fan assisted dryer used in order to reduce the water content substantially below 10% by weight.
  • Curing accelerators such as cobalt salts, may be added at step (c) .
  • Other additives such as fire retardants, pigments or the like may also advantageously be added at step (c) .
  • the cured polyester is preferably present in a minor amount by weight of the final building element, with a major part of the weight being a matrix derived from the softened and subsequently hardened thermoplastics, such that the matrix is bonded together by the cured polyester.
  • the amount of polyester therefore preferably does not exceed 20% by weight of the blend to be moulded, a preferred amount being in the range 8 to 15% by weight.
  • the moulding consists primarily of the thermoplastics and the resin
  • further materials may be present in some cases.
  • further materials are cured thermoset resins, glass, paper and/or cardboard, and rubber compounds (for example, from used vehicle tyres) .
  • waste material should be substantially free of biologically degradable material, or metals, such as aluminium, steel or the like, which may be recycled independently (and are therefore not "waste” as referred to above) .
  • a large variety of structural or building elements can be produced as unitary solid mouldings according to the invention, such as bricks, blocks, roof tiles, pallets, boards (such as floors, skirtings or facings) , doors and joists.
  • the mixture was transferred to a mould and subjected to a compressive force via a 10kg weight placed on top of the material present in the mould.
  • the mix was then allowed to cure, without application of external heating, for five minutes.
  • the resulting moulding in the shape of security fencing, could be drilled, planed, sanded etc in a manner similar to wood.
  • the mix was tumbled in a drum, and the resulting blend transferred to a mould and subjected to a compressive force via a 10kg weight placed on top of the material present in the mould.
  • the mix was then allowed to cure, without application of external heating, for five minutes.
  • the resulting moulding in the shape of joists, could be drilled, planed, sanded etc in a manner similar to wood.
  • the resulting blend was transferred to a mould and subjected to a compressive force via a 10kg weight placed on top of the material present in the mould.
  • the mix was then allowed to cure, without application of external heating, for five minutes.
  • the resulting moulding in the shape of pallets, could be drilled, planed, sanded etc in a manner similar to wood.
  • the introduction of air to the blend prior to curing produced a durable yet lightweight pallet.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Pour préparer des moulages unitaires solides, on ajoute, dans un récipient, des matières de déchets finement divisées à un lot de résine de polyester thermodurcissable thermiquement; on mélange les matières de déchets et la résine de polyester puis on soumet la résine contenue dans le mélange résultant à un durcissement exothermique sans appliquer une chaleur extérieure pendant que le mélange est dans le moule.
PCT/GB1997/002346 1996-09-03 1997-09-02 Moulage unitaire solide Ceased WO1998009785A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41239/97A AU4123997A (en) 1996-09-03 1997-09-02 Unitary solid moulding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9618326.4 1996-09-03
GB9618326A GB9618326D0 (en) 1996-09-03 1996-09-03 Building element manufacture

Publications (1)

Publication Number Publication Date
WO1998009785A1 true WO1998009785A1 (fr) 1998-03-12

Family

ID=10799308

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002346 Ceased WO1998009785A1 (fr) 1996-09-03 1997-09-02 Moulage unitaire solide

Country Status (4)

Country Link
AU (1) AU4123997A (fr)
GB (1) GB9618326D0 (fr)
WO (1) WO1998009785A1 (fr)
ZA (1) ZA977858B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004183A1 (fr) * 2001-07-03 2003-01-16 Strumat Limited Traitement de dechets
EP1447196A1 (fr) * 2003-02-13 2004-08-18 Louis Chometon Procédé de recyclage de matériaux plastiques

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937249A1 (de) * 1989-11-09 1991-05-16 Basf Ag Dekorative formteile aus kunststoff-abfall
JPH04209632A (ja) * 1990-11-30 1992-07-31 Ashimori Ind Co Ltd 管路の内張り材
DE4125267A1 (de) * 1991-07-31 1993-02-04 Bayer Ag Recycling-kunststofformmasse
EP0568893A1 (fr) * 1992-05-07 1993-11-10 Bayer Ag Recyclage de plastiques mis en forme
EP0572844A1 (fr) * 1992-05-30 1993-12-08 BASF Aktiengesellschaft Procédé pour la préparation d'une composition à mouler durcissable
WO1996011793A1 (fr) * 1994-10-17 1996-04-25 New Style S.P.A. Procede ecologique de fabrication de boutons pour vetements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3937249A1 (de) * 1989-11-09 1991-05-16 Basf Ag Dekorative formteile aus kunststoff-abfall
JPH04209632A (ja) * 1990-11-30 1992-07-31 Ashimori Ind Co Ltd 管路の内張り材
DE4125267A1 (de) * 1991-07-31 1993-02-04 Bayer Ag Recycling-kunststofformmasse
EP0568893A1 (fr) * 1992-05-07 1993-11-10 Bayer Ag Recyclage de plastiques mis en forme
EP0572844A1 (fr) * 1992-05-30 1993-12-08 BASF Aktiengesellschaft Procédé pour la préparation d'une composition à mouler durcissable
WO1996011793A1 (fr) * 1994-10-17 1996-04-25 New Style S.P.A. Procede ecologique de fabrication de boutons pour vetements

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 9237, Derwent World Patents Index; AN 92-304167, XP002049931 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003004183A1 (fr) * 2001-07-03 2003-01-16 Strumat Limited Traitement de dechets
EP1447196A1 (fr) * 2003-02-13 2004-08-18 Louis Chometon Procédé de recyclage de matériaux plastiques
FR2851192A1 (fr) * 2003-02-13 2004-08-20 Louis Chometon Procede de recyclage de materiaux plastiques rigides et semi-rigides, ainsi que substitut de granulat obtenu, sous-couche et materiau d'application btp comportant un tel substitut

Also Published As

Publication number Publication date
GB9618326D0 (en) 1996-10-16
ZA977858B (en) 1998-05-27
AU4123997A (en) 1998-03-26

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