EP0784640A1 - Composition de polyurethanne - Google Patents

Composition de polyurethanne

Info

Publication number
EP0784640A1
EP0784640A1 EP95932132A EP95932132A EP0784640A1 EP 0784640 A1 EP0784640 A1 EP 0784640A1 EP 95932132 A EP95932132 A EP 95932132A EP 95932132 A EP95932132 A EP 95932132A EP 0784640 A1 EP0784640 A1 EP 0784640A1
Authority
EP
European Patent Office
Prior art keywords
isocyanate
prepolymer
polyol
resin mixture
polymeric polyol
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
EP95932132A
Other languages
German (de)
English (en)
Inventor
Francesco Ciro Scognamiglio
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.)
Hyperlast Ltd
Original Assignee
Hyperlast 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 Hyperlast Ltd filed Critical Hyperlast Ltd
Publication of EP0784640A1 publication Critical patent/EP0784640A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0041—Foam properties having specified density
    • C08G2110/0066—≥ 150kg/m3
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2350/00—Acoustic or vibration damping material

Definitions

  • This invention relates to microcellular polyurethane products that have application as engineering components such as spring assisters, buffers, vibration isolators and the like.
  • microcellular polyurethane products are manufactured by forming a prepolymer or quasi-prepolyer from the total or partial reaction of a high molecular weight polyhydroxy component such as a polyester or polyether with naphthalene di- isocyanate (NDI).
  • NDI naphthalene di- isocyanate
  • the prepolymer or quasi- prepolymer is then reacted with water, a glycol, a catalyst together with appropriate additives to produce a microcellular material.
  • NDI naphthalene di- isocyanate
  • vapour pressure of NDI at the normal processing temperature is sufficiently high to give rise to the emission of toxic vapours.
  • the relatively long in-mould time required to produce the microcellular polyurethane which leads to high production cost and equipment cost.
  • MDI 4,4'-di-phenylmethane di- isocyanate
  • Moulded products made by casting or pouring method and by high pressure impingement mixing had inferior compression set and inferior performance under dynamic compressive stress.
  • Spring assisters in motor vehicles suspension applications are also required to meet very precise stress strain characteristics, which means that the density and modulus of the material must be controlled within very close limits. With conventional processes this can only be achieved with a limited number of moulding techniques.
  • a method of manufacturing a microcellular polyurethane comprising reacting a polymeric polyol having a molecular weight of at least 1000, a diol or diamine having from 2 to 20 carbon atoms and 4,4'-di-phenylmethane di-isocyanate (MDI) to produce a polyurethane having a density of from 0.3 to 0.7 g/cc.
  • MDI 4,4'-di-phenylmethane di-isocyanate
  • a prepolymer or quasi-prepolymer is formed from the poly ⁇ ieric polyol which is preferably a diol, triol or tetrol having a molecular weight of at least 1000 and the MDI.
  • the prepolymer is then reacted with a resin mixture formed from a pclymeric polyol which is preferably the same as the polymeric polyol used to form the prepolymer and the diol or diamine having 2 to 20 carbons.
  • the resin mixture may also include additives such as chain extenders, catalysts, surface active agents, blowing agents and the like.
  • the equivalent weight of the resin mixture, expressed as mg of KOH per gram of material is preferably in the range 200 to 300.
  • a preferred procedure for carrying out the invention to produce moulded products is as follows:-
  • Pre-heating (i) a prepolymer comprising the di-isocyanate and a polymeric polyol and (ii) a resin mixture of a polymeric polyol together with a diol or diamine having from 2 to 20 carbons, a chain extender, one or more catalysts, one or more surface- active agents, a blowing agent and other additives as may be required by technical or commercial considerations.
  • the injection moulded component may require no after treatment other than to remove sprue.
  • the polymeric polyol is, as already stated, one having a molecular weight of at least 1000, preferably about 2000.
  • Preferred polymeric polyols are difunctional polyester polyols having an equivalent weight of about 110, such as poly (hexamethylene) adipate, poly (butylene) adipate and poly (epsilon caprolactone), and polyether polyols such as poly (propylene) oxide and poly (tetramethylene) glycol. Combinations and co- polymers of more than one polymeric polyol can be used if desired.
  • the di-isocyanate used in the invention is preferably an alkyl or aryl substituted alkyl di-isocyanate such as 4,4'-diphenylmethane di- isocyanate (MDI).
  • MDI 4,4'-diphenylmethane di- isocyanate
  • the amounts of di-isocyanate and polyol used are preferably in the molar range 2:1 to 5:1, more particularly 2.4:1 to 5:1 di-isocyanate to polyol.
  • the preferred range of isocyanate groups to isocyanate reacting compounds is from 0.85:1 to 1.15:1.
  • Additives which are preferably included in the reaction mixture include one or more catalysts which are preferably secondary or tertiary amines, organometallic compounds such as organic tin compounds. By choosing the appropriate catalyst the cure time in the mould can be varied from twenty minutes to about three minutes. Using the same catalyst type the density of the product can be adjusted within the range 0.35 to 0.70 g/cc.
  • Particularly preferred catalysts include an amine salt sold under the name "Dabco" 33LV and an organotin compound sold under the name "Dabco” F12CL.
  • Other additives include sufactants, preferably non- silicone surfactants (because use of silicone will detract from the achievements of isotropy of the cells), antioxidants, bacteriostatic compounds and pigments. In the Examples all parts or percentages are by weight.
  • a quasi-prepolymer containing 20 to 22 wt% isocyanate group was prepared by the reaction between a polycaprolactone having an equivalent weight of approximately 1100 and 4,4'-diphenylmethane di- isocyanate.
  • the prepolymer was kept at a temperature of 42°C.
  • a resin mixture of the above polyester, 1,4- butane diol, water, tertiary amine catalyst, organometallic tin catalyst and a surface active agent was prepared and maintained at a temperature of 45°C.
  • the resin mixture was formulated to give an equivalent weight of 270.
  • Example I The process of Example I was repeated, but a polyol (resin) mixture having an equivalent weight of 230 and with 112 parts of prepolymer was mixed with 100 parts of polyol mixture (resin). Mouldings were produced as in Example I.
  • the density of the material was 250 kg/m 5 (moulded parts having a density of 450, 550 and 650 kg/m 3 could easily be produced from the same mixture with a demould time of less than 5 minutes).
  • the mouldings were then post cured for 12 hours at 90°C.
  • a quasi-prepolymer containing 14 to 16 wt% isocyanate groups was prepared by the reaction between a polyether glycol (PTMEG) having an equivalent weight of approximately 1100 and 4,4'- diphenylmethane di-isocyanate.
  • PTMEG polyether glycol
  • the quasi-prepolymer was kept at a temperature of 40°C.
  • a resin mixture of the above polyether 1,4- butane diol, water, tertiary amine catalyst, organometallic tin catalyst and a surface active agent was prepared and maintained at a temperature of 40°C.
  • the resin mixture was formulated to give an equivalent weight of 260.
  • the mouldings were then post cured for 6 hours at 90°C.
  • a quasi-prepolymer containing 14 to 16 wt% isocyanate group was prepared by the reaction between a polyethylene/butylene adipate having an equivalent weight of approximately 1050 and 4,4'-diphenylmethane di-isocyanate.
  • the prepolymer was kept at a temperature of 40°C.
  • a mixture of the above polyester linear and branched, 1,4-butane diol, water, tertiary amine catalyst, organometallic tin catalyst and surface active agent was pre-poured and maintained at 40°C.
  • the above mixture was formulated to give an equivalent weight of 240.
  • the density of the free foam was 230 kg/m J .
  • Moldded parts having a density of 450,550 and 650 kg/m 3 could easily be produced from the same mixture with a demould time of less than 5 minutes).
  • the mouldings were then post-cured for 16 hours at 90°C.
  • a dynamic fatigue test was carried out on a moulded product as illustrated in the accompanying drawing which shows an axial section through a typical spring assistor for a motor vehicle suspension.
  • the part was made in each of the Example formulations.
  • the part density was approximately 500 kg/m 3 .
  • the test comprised 200,000 compression cycles at 2HZ at a load of 4KN. On completion of test, the part showed that the permanent set did not exceed 5% and there was no evidence of any splits or cracks, internally or externally.
  • microcellular polyurethane products and particularly vehicle suspensions spring aids and jounce bumpers can be obtained in any desired internal and external configuration using high or low pressure liquid injection moulding technique, casting or othei fluid moulding techniques.
  • an advantage of the invention is that by the use of any of the conventional polyurethane dispensing machinery, articles can be produced by introducing the liquid mixture into closed moulds, thus atmospheric contamination by di-isocyanates can be more easily controlled and also the production cycle time can be reduced without incurring other processing penalties.
  • the invention permits the production of a wide range of part weights and configurations over a range of densities from 0.45 to 0.70 cc without any changes or adjustment to the process parameters or to the reacting mixtures.
  • the physical and dynamic properties of the moulded products are of a level which have not been achieved hitherto with MDI as the isocyanate.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

Procédé de production d'un polyuréthanne possédant une densité de l'ordre de 0,3 à 0,7 g/cc ainsi que de bonnes propriétés physiques et dynamiques, consistant à préchauffer un prépolymère consistant en un di-isocyanate de 4,4'-diphénylméthane et un polyol polymère possédant un poids moléculaire d'au moins 1000, puis à mélanger ce prépolymère avec un mélange résineux d'un polyol polymère qui peut être le même que le premier polyol.
EP95932132A 1994-10-05 1995-09-27 Composition de polyurethanne Ceased EP0784640A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9420107 1994-10-05
GB9420107A GB9420107D0 (en) 1994-10-05 1994-10-05 Polyurethane composition
PCT/GB1995/002289 WO1996011219A1 (fr) 1994-10-05 1995-09-27 Composition de polyurethanne

Publications (1)

Publication Number Publication Date
EP0784640A1 true EP0784640A1 (fr) 1997-07-23

Family

ID=10762399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95932132A Ceased EP0784640A1 (fr) 1994-10-05 1995-09-27 Composition de polyurethanne

Country Status (11)

Country Link
EP (1) EP0784640A1 (fr)
JP (1) JPH10507218A (fr)
KR (1) KR970706325A (fr)
CN (1) CN1167494A (fr)
AU (1) AU3530895A (fr)
BR (1) BR9509282A (fr)
CA (1) CA2201929A1 (fr)
CZ (1) CZ103997A3 (fr)
GB (1) GB9420107D0 (fr)
PL (1) PL319722A1 (fr)
WO (1) WO1996011219A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI245778B (en) * 2000-12-27 2005-12-21 Hitachi Chemical Co Ltd Photobase generating agent, and curable composition comprising the same
JP4459711B2 (ja) * 2004-05-12 2010-04-28 日本ポリウレタン工業株式会社 鉄道用パッドの製造方法
DE102005008242A1 (de) 2005-02-22 2006-08-24 Basf Ag Zylindrische Formkörper auf der Basis von zelligen Polyurethanelastomeren
DE102005008263A1 (de) * 2005-02-22 2006-08-24 Basf Ag Verfahren zur Herstellung von zylindrischen Formkörpern auf der Basis von zelligen Polyurethanelastomeren
US8642670B2 (en) 2008-03-14 2014-02-04 Basf Se Coarse-cell polyurethane elastomers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1534551A (fr) * 1966-12-06 1968-07-26 Elastomer Ag Procédé pour l'obtention de matériaux cellulaires en polyuréthanne fortement élastiques, résistants à la déchirure et au froid et possédant un poids spécifiquerelativement élevé
US3856716A (en) * 1971-03-10 1974-12-24 Laporte Industries Ltd High density polyurethane foams
GB1453794A (en) * 1974-01-11 1976-10-27 Interox Chemicals Ltd Polyurethane foams
DE2940856A1 (de) * 1979-10-09 1981-04-23 Elastogran GmbH, 2844 Lemförde Verfahren zur herstellung von gegebenenfalls zellhaltigen polyurethan-elastomeren
IT1240635B (it) * 1990-05-04 1993-12-17 Dow Italia Polimeri poliuretanici microcellulari preparati da tre polimeri di poli (tetrametilen) glicoli con gruppi isocianato terminali
DE4102174A1 (de) * 1991-01-25 1992-07-30 Basf Ag Verfahren zur herstellung von zelligen polyurethan-elastomeren unter verwendung von polyethercarbonatdiolen als ausgangskomponente

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9611219A1 *

Also Published As

Publication number Publication date
WO1996011219A1 (fr) 1996-04-18
BR9509282A (pt) 1997-11-18
AU3530895A (en) 1996-05-02
PL319722A1 (en) 1997-08-18
KR970706325A (ko) 1997-11-03
CZ103997A3 (en) 1997-11-12
CA2201929A1 (fr) 1996-04-18
JPH10507218A (ja) 1998-07-14
CN1167494A (zh) 1997-12-10
GB9420107D0 (en) 1994-11-16

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