DE1669932A1 - Process for the production of objects from polyurethane foam - Google Patents

Description

DR. F. ZUM8TEIN - DR. E. AS β MAN N DR. R. KOENIQ8BERQER - DIPU-PHYe-R-HOLZBAUER

TCLCFOM: «8 * 47 · UfWl SB 1 · 11

• mnMMM>, 2UMMT · MONOHBN Λ

POSTAL ACCOUNT: MONOHCN Ml · ·
BANK ACCOUNT:

ΘΟ / zö

Case DH 4066

DUNLOP RUBBER COMPANY LIMITED, London, UK

SIK = B XS =: ======= 3

Process for the manufacture of articles from polyurethane

scheum.

The invention relates to a method for producing polyurethane foams and in particular a method of making molded flexible articles from polyurethane foam, where no high temperature hardening is necessary.

Polyurethane resins are made into a ·· polyol uod • ines polyisocyanates (or polyisothiocyanates) la present a propellant obtained. Lake propellant is sweckaäSigerweiae Carbon dioxide, which in each case is a result of the reactions, by which the polyurethane is formed is obtained. For example, a foam-forming mass can be produced, by a polymeric polyol and polyisooyanate under BiI-

009649/1938

extension of a polyurethane prepolymer nit free Ieocyanatgruppen ungeeetst is "dee then with a compound _t as water, is ungesetst containing aktiTe hydrogen atone, the Kohlendioxyderseugung does su cause woduroh the resulting polyurethane is gesohäuat" Polyurethanschäune may alternatively after dea " In a single step process, a polymeric polyoil, a polyisocyanate and an active hydrogen-containing compound Susanne are mixed with any other required constituent parts and the reaction of the constituents of the composition yields a polyurethane which is simultaneously topped by the carbon dioxide dispersed in the process will.

When the desired polyurethane material is intended for use in the manufacture of large objects such as mattresses, the participants in the action are bred together and the mixture is poured into a bowl, with the resulting polyurethane being foamed by the carbon dioxide sucked in during the reaction which results in a self-supporting polyurethane "Ieio" which, after gelling, can be cut into the «desired objects». However, if the polyurethane sauna products are to be used for the manufacture of smaller objects with a more difficult design, for example for seat cushions, the "body ^n- process is by far not as important and precautions are often taken to avoid the polyurethane approach

009849/1938

a closed form, while the mixture of the reactants is introduced into the form, which is neglected and left long enough to form the polyurethane foam and gel to the form of the form It is necessary to use conventional polyisocyanates, such as volylenediisocyanates, to subject the shaped article to a further stage of ripening, which normally involves removing the shaped article from the pore and heating it in a hot air oven. The susateliohe stage is inexpedient and increases the capacity of the molded products because of the increased product ionization, the "space required to accommodate the furnaces and their high capital capacity as well as the fuel necessary for their production"

According to the present invention, a method is provided obtained by the molded polyurethane foam object without the need for the above mentioned level. According to a feature of the invention, therefore flexible polyurethane foam against tape made by a polymeric polyol with an organic Polyiaooyanat sur reaction is brought, the polyol iat a polyoxypropylene with το »ithylenoxid derived Eettenendgruppen, the Polyieocyanat Contains?, 3 or 4 bentol rings, each of which is mindeetena

009849/1938

OWÖINAL INSPECTED

carries a laooyanatgruppe and the rings are connected to one another by ethylene groups, and wherein the reaction mixture, which contains the polyol and the polyioocyanate, is given in a form and allowed to harden without the application of heat. The fact that polyisocyanate is one of the technical products known as MSI or P.Α · Ρ _β I. Bind.

H.D.I, iet a dileocyanate of the Vorael

iind P.A.P.I. let a steadily droned Mieohun .; τοη di, tri and Tetraeooyanaten, the approximately three Iaooyaiiatgruppen per mole · kül contains · Vif the Mieohuiig is simply viewed in such a way that ei · three ionooyanate groups per molecule contains "can" all a formula τοη isomers dt r the following general Yornel

Where

009849/1938

be considered.

Dae in the inventive process used polymeric Polyol 1st sweckmäßigerweise a Polyäthertriol having a molecular weight of from 3000 to 700O ₉ in particular from 3000 to 5000, in "splelswelse of 4600 to 500Oo If also been found let that triols provide very satisfactory Srgebniese, the polyol need not necessarily have three hydroxyl groups and can, for example, be a petrol or hexol or a mixture of poly oils with a different number of hydroxyl groups per molecule . Regardless of the type of polyol component, it preferably has a hydroxyl number.1 from 24 to 56, in particular from 33 to 5 *> * for example from 33 to 34 »

The polyol may suitably be any block copolymer of propylene oxide, ie of 1 _s 2-propylene oxide and ethylene oxide, wherein the greater part of the length of the polymer is the chain of groups derived from propylene oxide and a smaller part of the length of the Chain at the ends of which consists of groups derived from ethylene oxide. Suitable polyols are well known generally commercially available as "polyols having Äthylenoxydspitze" (ethylene oxide tipjed polyol) · The polyol may, for example, a diol leg ₉ which has been initiated by water CDER a Dihydroxyglykol by a polymerization in bulk, Wurd prepared> * ₉ or the polyol can be known as Tr.tol or a tetrol that is preceded by e: \ ne

009849/1938

Polymer! sat ion is produced in mass, which is worrlen by a Polyhydroxy alcohol, for example glycerine, or a polyamine has been initiated. The use of a polyoxypropylene triol old a glycerine middle piece and oxyethylene bands are special preferred.

A catalyst is preferably used in the polyurethane foam-forming composition but acceleration of the crosslinking or the chain expansion of the foam mass included and it can include the compounds, which are usually used as catalysts in the production of flexible polyurethane foams »find application« Suitable catalysts are, for example, amine catalysts, like one or more of the compounds'.? rläthylenediamine * H-dimethylethanolamine and S-methylmorpholine * Other suitable catalysts are metal compounds that are usually used as catalysts are used »for example esters, alkyl esters and salts of metals of groups 4t 5 and 6 of the periodic table, where the metals of group 4, especially the metals in the subgroup A, are preferred. Examples as bialkyl tin diesters of fatty acids, such as sibutyl indilaurate, dibutocyclin dilaurate, and divalent tin soaps, such as tin (IT} octoate, tin (II) isooctoate and tin (IZ) oleate. If necessary, the catalyst can be a misery from one or more amine catalysts and from one or of several metal compound catalysts comprise «»

009849/1938

The total amount of catalyst can be between 0.3 and 2 jt, in particular 0.5 to 1.5 pounds of the weight of the polyol make up.

tn the invention & Ben Terfahren can be a surface-active Means can be used, however, this is not essential. Any surface-active gown can be used, including in the past in Miaohungen but manufacture of flexible poly- urethana foams are incorporated, special silicone oils, • pielaweiae Folyailonn / Oxyelkyle n-Blookaiaohpolyaarieate.

If the propellant carbon dioxide is used, because of the use of water in the reaction, the water can be incorporated into the reaction as a liquid component or it can be prepared in the form of a liquid, which is supplied during the reaction, if the water is used as a liquid Loeponente is added * if the weight of the weight is normally ± m range from 2 to 5 pounds, but especially from 2.5 to 3.5 tons, based on the weight of the polyol.

The polyurethane replica-forming components can contain Kebenbeatandteile, beiapielBweiae SchauBatabiliaierungBaittel, Pignente, fillers and auxiliary blowing agents.

The following examples are intended to further illustrate the present invention without restricting it.

009849/1938

Example 1 to 10

These examples show the manufacture of flexible polyurethane foam molded articles without the use of a separate one Bärtung8stufe described.

The table below shows the ingredients used in each example and the weights in which these ingredients are used ». The polyol is a polyoxypropylene with chain end groups »derived from xthylene oxide. In Examples 1 to 5 and in Examples 7 to 10 the polyol has a molecular weight of 5,000, while in Example 6 the polyol has a molecular weight of 3,000. "Dabco" b & w. "Propanine A ^N are commercially available friethylenediamine and W-dimethylethanolamine products. Bas SillkonBl L.520 1st ein.Polynethylsiloxan / Oxyalkylen-Blookaischpolymerlsat ·

The foams are produced according to the following procedure!

The following four reaction components are formed from the ingredients educated:

A polyol

B a mixture of water »amine

catalyst or catalysts and silicone ul

009849/1938

C ■ polyocyanate D linn- (II) -ootoet (if used

det), dissolved in a small amount of the polyol

These four components then become a quadruple beam head at the same time where they are sunk together, and the resulting mixture is fed into an ion, which is then closed · Foaming and cross-linking of the foam takes place in the closed ponn without any procedural difficulties instead of and within 10 minutes after the closure of the form, a hardened polyurethane building product becomes This time is, of course, considerably less than that required when the molded product is placed in a hot air oven is hardened.

When a quadruple loading head is not available • teh, the reaction mixture can be obtained «by first the ingredients A and B are mixed, then C and then D is mixed in ο

009849/1938

Tabel

Example Mr. 1 5 2 3 4th 5 6th 7th 8th 9 10 Folyol 100 100 100 100 100 100 100 100 100 100 water 2, 5 2.5 2.5 2.5 3.5 2.5 2.5 3.5 2.5 2.5 Catalysts • ο
O
co "Baboo"
"Propamine * A" 0, mm
UO 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 GO
■ Ρ- H-MethylaerpnoliB 1
4th W. 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 co Tin (II) octoate - 0.4 0.4 0.4 0.4 0.5 0.2 0.2 0.2 0.2 1938 Silicone oil
M ₀ D ₀ I. 0,
44, 0.1
44.4 0.1
44.4 44.4 0.2
59.4 0.2
50.1 0.2
50.1 0.2
66 * 5 0.2
66.5 0.2
** ^ P.A.P.I «* Ht - M. ~ IN THE. ve 48, \ Ireon II (triochlorofluor
ine than) 10 10 10 10 10 10 - 10 - 10

Claims (1)

- 11 claims 1. Cold hardening processes for the production of molded flexible Polyurethane foam objects by umaetaung a polyeeren Polyola with an organic polyisocyanate, thereby marked » that the polyol is a polyoxypropylene bit chain end groups iat, which are derived from ethylene oxide, daa polysooyanate 2, 3 or 4 bencol rings each having at least one laooyanate group wear the rings with one another through kethylene groups are connected, and the reaction anisohung that the polyol and which contains Polyiaooyanate, fed into a vom and left behind without the application of heat. 2 c Yerfahrsn na oh Anepruoti 1, thereby ^ knowing «defl that Polyiaooyanat Diphenylmethandli8oeyanat iat. ? » Method according to claim 1, characterized in that daa Polyisocyanate P.A.P.I. is" 4 · Method according to one of the preceding claims, characterized in that the polyol is a triol with a «molecular weight from 3000 to 7000 iat " 5. The method according to claim 4, characterized in that the polyol has a molecular weight of 4800 to 9000 009849/1938 6. The method according to any one of the preceding claims, characterized in that the polyol has a hydroxyl number of 24 to 56 Has. 7. The method according to claim 6, characterized in that the Polyol has a hydroacyl number of 33 Ms 56 « 8 · Method according to one of the preceding claims, daduroh characterized in that the polyol has a Glyeerin «MitteletÜolr 009849/1938