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WO1997011824A1 - Procede et appareil de melange a haute pression pour la production de mousses legeres de polyurethanne - Google Patents

Procede et appareil de melange a haute pression pour la production de mousses legeres de polyurethanne Download PDF

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Publication number
WO1997011824A1
WO1997011824A1 PCT/EP1996/004070 EP9604070W WO9711824A1 WO 1997011824 A1 WO1997011824 A1 WO 1997011824A1 EP 9604070 W EP9604070 W EP 9604070W WO 9711824 A1 WO9711824 A1 WO 9711824A1
Authority
WO
WIPO (PCT)
Prior art keywords
frothing
chamber
mixture
mixing
pressure
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/EP1996/004070
Other languages
English (en)
Inventor
Carlo Fiorentini
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.)
Afros SpA
Original Assignee
Afros SpA
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 Afros SpA filed Critical Afros SpA
Priority to DE29622866U priority Critical patent/DE29622866U1/de
Publication of WO1997011824A1 publication Critical patent/WO1997011824A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/76—Mixers with stream-impingement mixing head
    • B29B7/7663—Mixers with stream-impingement mixing head the mixing head having an outlet tube with a reciprocating plunger, e.g. with the jets impinging in the tube
    • B29B7/7668—Mixers with stream-impingement mixing head the mixing head having an outlet tube with a reciprocating plunger, e.g. with the jets impinging in the tube having a second tube intersecting the first one with the jets impinging in the second tube
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
    • B29B7/603—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material in measured doses, e.g. proportioning of several materials
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B29B7/726—Measuring properties of mixture, e.g. temperature or density
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7404—Mixing devices specially adapted for foamable substances
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/76—Mixers with stream-impingement mixing head
    • B29B7/7615—Mixers with stream-impingement mixing head characterised by arrangements for controlling, measuring or regulating, e.g. for feeding or proportioning the components
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]

Definitions

  • the present invention relates to the production of frothed polyurethane foams, and more precisely it refers to a 5. process and to a high-pressure mixing apparatus for the production of polyurethane foams from a reactive mixture of chemical components comprising a polyol, an isocyanate, additives and a very low-boiling inert blowing agent, such as liguid C0 2 , which is mixed at a liquid state.
  • Typical self-cleaning high-pressure mixing apparatus for the production of foamed polyurethane material are descri ⁇ bed in several prior patents, for example in US-A- 3,706,515, US-A-4,175,874, US-A-4,332,335 and US-A- 4,440,500.
  • a high-pressure mixing apparatus comprises a cylindrical mixing chamber into which the reactive chemical components supplied at high pressure are injected; the components are thoroughly mixed together owing to the violent inpingiment between the jets, resulting in a
  • liquid polyurethane mixtures which foam due to C0 2 gener- ated by the chemical reaction which takes place between the polyol and water (chemical C0 2 ) inside the cavity of a mould.
  • frothing is also well known in the production of polyu ⁇ rethane foams; according to this technique, a non-reactive, low-boiling inert gas, or blowing agent, is suitably added and mixed with the reactive polyurethane components, and the resulting mixture is frothed by releasing the pressure io. when pouring into the cavity of the mould, so as to cause rapid frothing or pre-expansion of the polyurethane mixture in the form of a very dense cream, prior to the start of the chemical reaction between the components, and the polymerization phase.
  • EP-A-0,070,486 illustrates the use of a throttling member at the outlet of the mixing chamber
  • the invention therefore rela ⁇ tes to a process for the production of a frothed polyuret-
  • the invention relates to a high-pressure mixing apparatus, in particular for the
  • the apparatus comprising: a body defining a mixing chamber (10) having a longitudinal axis, in which the polyurethane components and the blowing agent are mixed at io. a first pressure value (Pl) sufficient to keep the blowing agent in a liquid state; wherein the mixing chamber (10) is connected to a discharge duct differently oriented with respect to the same mixing chamber (10) of the mixing apparatus, and wherein throttling means (26) are provided
  • said mixing chamber (10) being connected to the discharge duct (19) via an intermediate frothing chamber (18), in combination with back-pressure generating means provided between the frot ⁇ hing chamber (18) and the discharge duct (19) for genera-
  • the innovative aspect of the invention therefore lies in control mode of the pressure conditions inside the mixing chamber and of the mixture immediately after leaving the
  • the invention therefore allows application of the frothing technique to high-pressure mixing apparatus at self-clea ⁇ ning type, which totally eliminate the use of solvents and 20. parts to be removed, replaced or thrown away.
  • - Figure 1 is a schematic view showing a first configura- 25. tion of an apparatus according to the invention
  • - Figure 2 is a schematic view showing a second configura ⁇ tion of an apparatus according to the invention
  • FIG. 3 is a cross-sectional view of a preferred embodi ⁇ ment of an apparatus according to the invention.
  • the apparatus substantially comprises a mixing chamber 10, for example cylindrical in shape, having a longitudinal axis vertically directed in Figure 1, and a very short length, ranging between 2 to 2.5 diameters of the same chamber or less, into which the
  • reactive chemical components such as for example a polyol and an isocyanate contained in the tanks A and B, together with the respective additives, are injected into the mixing chamber via nozzles 11 and 12.
  • the components A and B and the additives are supplied at high pressure into the cham-
  • ber 10 in stoichiometrically metered quantities by means of respective volumetric pumps 13 and 14.
  • Reference 15 deno ⁇ tes, moreover, the supply of a low-boiling, inert, blowing agent, in particular liquid C0 2 , which is injected into the duct for supplying one of the components, for example into
  • the stream of polyol in quantities of between 1 and 10 per cent by weight of the said polyol.
  • sufficient to keep the blowing agent in the liquid state for example at a pressure of between 5 and 20 bar, or greater, which is
  • the outlet 17 of the mixing chamber 10 which opens into a successive intermediate frothing chamber 18 is partially restricted by arranging in between a throttling member which can be provided by any io. suitable means, as explained further below.
  • the longitudinal axis of the chamber 18 is moreover angu ⁇ larly arranged, for example perpendicular to the longitudi ⁇ nal axis of the chamber 10, said intermediate chamber 18 opening out into a discharge duct 19 consisting of a cylin-
  • the longitudinal axis of the duct 19 is in turn arranged at an angle, for example perpendicular to the longitudinal axis of the
  • intermediate chamber 18 extending over a substantial length. According to the present invention, it is necessary that the intermediate chamber 18, also referred to as frothing chamber, will have a substantial length which will maximise the controlled releasing of the blowing agent; more preci-
  • a partial frothing step of the mixture under pressure controlled conditions takes place, so as to generate in the vicinity and immediately after the outlet 17 of the mixing chamber, a back-pressure P2 lower than the pressure Pl io. existing inside the mixing chamber 10, for example a pres ⁇ sure P2 ranging between 0.2 and 2 bar sufficient to keep initially the mixture in a semi-liquid state to prevent uncontrolled or sudden explosion of the said mixture.
  • the apparatus has therefore been provided with means for throttling the outlet of the mixing chamber, in combination with means for deviation of the mixture from the chamber 10 to chamber 18 and to the duct 19 suitable for generating inside the chamber 18 a
  • back-pressure P2 necessary for preventing high output speed of the flow and for quieting the frothing mixture.
  • These means may be realized in any suitable form for allowing, in their combination, the mixing of the blowing agent in liquid form and generation of the required back-pressure
  • Figure 2 shows a configuration of the flow path substan ⁇ tially similar to that of Figure 1, with the difference that now the frothing chamber 18 is shorter in length having its outlet 20 which opens out between the discharge 5.
  • duct 19 and a rear dead-end chamber 21 defining a dead zone for accumulation of the frothing mixture, which in this example is arranged at the rear end and axially ali ⁇ gned to the discharge duct 19 but, if required, could also be differently positioned.
  • liquid surface which constitutes a continuation of the mixing chamber wall or a liquid cushioning at the bottom of the discharge duct which tends to further dampen the mixtu- re .
  • Figure 3 of the accompanying drawings shows a practical embodiment of a high-pressure mixing apparatus, of the self-cleaning type, on the basis of which both the functiono- 5.
  • nal diagram of Figure 1 and that of Figure 2 can be perfor ⁇ med.
  • the apparatus has a body 22 formed by several parts, comprising a small mixing chamber 10 of substantially cylindrical shape, which has sliding inside it a cleaning plunger 23 connected to the piston member 24 of a first hydraulic actuating cylinder 25.
  • mixing chamber 10 opens out at right angles into an inter ⁇ mediate frothing chamber 18, of suitable length, having a diameter greater than that of the mixing chamber 10; a second cleaning plunger 26 slides inside the chamber 18, being connected to the piston member 27 of a second hydrau-
  • Figure 3 shows moreover means for adjusting the stroke of the plunger 26, for example consisting of an adjustable stop 29 which can be operated by screwing so as to define the retracted position of the piston 27, in order to adjust or vary the throttling degree
  • the intermediate or frothing chamber 18 in turn leads into a wide discharge duct 19 arranged angularly, i.e. perpendi ⁇ cularly with respect to the said chamber, having sliding inside a third cleaning plunger 30 connected to the piston 5.
  • All the hydraulic cylinders can be operated in an appro ⁇ priate sequence to move the respective cleaning plunger between a retracted position, shown in Figure 3, where the mixing chamber 10 opens out into the frothing chamber 18 io. and where the frothing chamber 18 opens out into the di ⁇ scharge duct 19, and an advanced position to close the apparatus; in this position the cleaning plunger 23 acts first of all, expelling the residual mixture inside the chamber 10 towards the frothing chamber 18; then the dea ⁇ ls, ning plunger 26 is actuated to expel the residual mixture from the frothing chamber 18 into the discharge duct 19 and, finally, the cleaning plunger 30 acts to expel the residual mixture inside the discharge duct 19, operating in the reverse sequence during opening of the apparatus.
  • the cleaning plunger 30 of the discharge duct 19 may be moved between a totally advanced position, where it closes the outlet of the frothing chamber 18 and duct 19 and a first retracted position where the tip of the plunger 30 is
  • retraction of the plunger 30 with respect to the chamber 18 may be between 0.5 to 1 times the diameter of the plunger itself, or less. It is obvious that in the second case the frothing chamber 18 may also be shorter by three diameters and the actuating cylinder 32 may be provi- lo. ded with a suitable adjustable stop device, for example such as that indicated by 29 for the actuating cylinder 28.
  • the two chambers 10 and 18, as well as the discharge duct 19, have their longitudinal axes lying on a same plane; however, a different tridimentional
  • the mixing chamber 10 had a diameter of 12 mm and a sub- io. stantially corresponding length; the frothing chamber 18 had a diameter of 16 mm and a length of 32 mm; the discharge duct 19 had a diameter of 30 mm and a length of 90 mm.
  • a mixture of polyurethane components of conventional formu ⁇ lation was used, adopting liquid C0 2 as the blowing agent, in a quantity of five parts by weight with respect to the polyol of the reactive mixture.
  • the pumps 13 and 14 were preset for an overall throughput 20. of the apparatus of 400 g per second, measuring a pressure Pl close to atmospheric pressure inside the mixing chamber 10, entirely unsuitable for mixing, in the liquid state, of the blowing agent; no damping effect of the flow was obtai- ned at the outlet of the chamber 10.
  • the frothed mixture which emerged from the apparatus was directly poured into the open cavity of a mould.
  • the resultant frothed mixture led to the formation of a foam of inconsistent quality, with irregular cells and io. large cavities.
  • a throttling means was provided at the outlet of the mixing chamber 10, by advancing the
  • the foam 20 was performed at a pressure of about 17 bar, measuring a pres ⁇ sure of about 1.5 Bar inside the frothing chamber 18 near the outlet of the mixing chamber 10.
  • the foam had a density of about 27 kg/m 3 , with a homoge ⁇ neous and fine cell structure, devoid of any large cavi ⁇ ties.
  • the quality of the foam was considered to be of a commercially acceptable quality.
  • a pressure P2 of about 1.3 bar was measured inside the frothing chamber 18, and a pressure again of about 17 bar 15. was measured inside the mixing chamber.
  • the frothed mixture emerged in a very gentle and controlled manner, as in the previous example, obtaining in this case a foam of improved quality, having a density of about 26 kg/m 3 , and a homogeneous cell structure totally devoid of 20. voids and cavities.
  • the frothing technique can therefore be advantageously used in high-pressure mixing for the production of frothed, polyurethane foams having superior quality, by suitably controlling the release of

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

L'invention concerne un procédé et un appareil de mélange à haute pression pour la production d'une mousse légère de polyuréthanne. Deux composés chimiques réactifs et un agent gonflant à point d'ébullition bas (CO2) sont mélangés dans un récipient mélangeur à haute pression comprenant une chambre de mélange (10) communiquant avec une conduite d'évacuation (19). Le mélange passe par un étranglement pour générer à l'intérieur de la chambre de mélange (10) une pression suffisante pour maintenir l'agent gonflant à l'état liquide. Le mélange est soumis à un écumage par libération de l'agent gonflant dans la chambre d'écumage (18) située entre la chambre de mélange (10) et la conduite d'évacuation (19). Une contre-pression est produite dans le mélange par l'écumage dans la chambre d'écumage (18) sur une longueur substantielle et à un changement de la direction d'écoulement du mélange à écumage sur le trajet entre la chambre d'écumage (18) et la conduite d'évacuation (19).
PCT/EP1996/004070 1995-09-25 1996-09-18 Procede et appareil de melange a haute pression pour la production de mousses legeres de polyurethanne Ceased WO1997011824A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29622866U DE29622866U1 (de) 1995-09-25 1996-09-18 Hochdruckmischvorrichtung zur Erzeugung von geschäumtem Polyurethanschaumstoff

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI95A001975 1995-09-25
IT95MI001975A IT1277651B1 (it) 1995-09-25 1995-09-25 Procedimento e apparecchiatura di miscelazione ad alta pressione, per la produzione di schiume poliuretaniche pre-espanse

Publications (1)

Publication Number Publication Date
WO1997011824A1 true WO1997011824A1 (fr) 1997-04-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/004070 Ceased WO1997011824A1 (fr) 1995-09-25 1996-09-18 Procede et appareil de melange a haute pression pour la production de mousses legeres de polyurethanne

Country Status (3)

Country Link
DE (1) DE29622866U1 (fr)
IT (1) IT1277651B1 (fr)
WO (1) WO1997011824A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1186391A1 (fr) * 2000-09-05 2002-03-13 Hennecke GmbH Procédé pour la fabrication de pièces moulées en matières plastiques à partir d'un mélange réactif coulable
ITMI20082103A1 (it) * 2008-11-25 2010-05-26 Afros Spa Metodo e apparecchiatura per la miscelazione di componenti poliuretanici, con controllo dell'agente di espansione.
CN113001866B (zh) * 2019-12-20 2024-06-11 康隆股份公司 用于浇注无飞溅物的聚合物混合物的方法和设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141470A (en) * 1976-03-25 1979-02-27 Bayer Aktiengesellschaft Mixing head for mixing at least two reactive components
EP0070486A1 (fr) * 1981-07-22 1983-01-26 MASCHINENFABRIK HENNECKE GmbH Procédé et dispositif pour produire un mélange réactionnel de composants fluides au moins avec deux composantes de réaction capables de couler, réagissantes ensemble pour devenir une matière homogène ou de mousse
JPS58219029A (ja) * 1982-06-15 1983-12-20 Achilles Corp ポリウレタンフオ−ムの製造方法
EP0418585A1 (fr) * 1989-08-24 1991-03-27 Dow Corning Corporation Dispositif pour mélanger et appliquer de la mousse avec chambre pour former la mousse et procédé d'utilisation
DE4211458A1 (de) * 1992-04-06 1993-10-07 Hennecke Gmbh Maschf Einrichtung zum Herstellen eines fließfähigen Reaktionsgemisches aus mindestens zwei fließfähigen, miteinander zu Massivstoff oder Schaumstoff reagierenden Reaktionskomponenten
US5270014A (en) * 1991-03-19 1993-12-14 Krauss-Maffei Ag Apparatus for producing a foamed mass of a polyurea elastomer
US5277567A (en) * 1990-03-23 1994-01-11 Krauss Maffei Ag Apparatus for mixing reactive synthetic-resin components

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141470A (en) * 1976-03-25 1979-02-27 Bayer Aktiengesellschaft Mixing head for mixing at least two reactive components
EP0070486A1 (fr) * 1981-07-22 1983-01-26 MASCHINENFABRIK HENNECKE GmbH Procédé et dispositif pour produire un mélange réactionnel de composants fluides au moins avec deux composantes de réaction capables de couler, réagissantes ensemble pour devenir une matière homogène ou de mousse
JPS58219029A (ja) * 1982-06-15 1983-12-20 Achilles Corp ポリウレタンフオ−ムの製造方法
EP0418585A1 (fr) * 1989-08-24 1991-03-27 Dow Corning Corporation Dispositif pour mélanger et appliquer de la mousse avec chambre pour former la mousse et procédé d'utilisation
US5277567A (en) * 1990-03-23 1994-01-11 Krauss Maffei Ag Apparatus for mixing reactive synthetic-resin components
US5270014A (en) * 1991-03-19 1993-12-14 Krauss-Maffei Ag Apparatus for producing a foamed mass of a polyurea elastomer
DE4211458A1 (de) * 1992-04-06 1993-10-07 Hennecke Gmbh Maschf Einrichtung zum Herstellen eines fließfähigen Reaktionsgemisches aus mindestens zwei fließfähigen, miteinander zu Massivstoff oder Schaumstoff reagierenden Reaktionskomponenten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 073 (M - 287) 5 April 1984 (1984-04-05) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1186391A1 (fr) * 2000-09-05 2002-03-13 Hennecke GmbH Procédé pour la fabrication de pièces moulées en matières plastiques à partir d'un mélange réactif coulable
US6635200B2 (en) 2000-09-05 2003-10-21 Hennecke Gmbh Process and device for producing plastic moldings from a flowable reaction mixture
ITMI20082103A1 (it) * 2008-11-25 2010-05-26 Afros Spa Metodo e apparecchiatura per la miscelazione di componenti poliuretanici, con controllo dell'agente di espansione.
CN113001866B (zh) * 2019-12-20 2024-06-11 康隆股份公司 用于浇注无飞溅物的聚合物混合物的方法和设备

Also Published As

Publication number Publication date
DE29622866U1 (de) 1997-07-10
ITMI951975A1 (it) 1997-03-25
ITMI951975A0 (fr) 1995-09-25
IT1277651B1 (it) 1997-11-11

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