EP3728372A1

EP3728372A1 - Polyurethane hybrid polymers and process for the production thereof

Info

Publication number: EP3728372A1
Application number: EP18819103.5A
Authority: EP
Inventors: Hans-Detlef Arntz; Koichi Kawamura; Gerlinde Koss-Nasser; Erhard Michels
Original assignee: Covestro Deutschland AG
Current assignee: Covestro Deutschland AG
Priority date: 2017-12-21
Filing date: 2018-12-14
Publication date: 2020-10-28
Also published as: US10889679B2; EP3502154A1; US20200308333A1; WO2019121355A1; CN111527117A

Abstract

The present invention relates to polyurethane hybrid polymers and to a process for producing same.

Description

Polyurethane hybrid polymers and a process for their preparation

The present invention relates to polyurethane hybrid polymers and a process for their

Production.

For polymer materials, the water absorption of the material material used is an important property. Thus, the water absorption of polyurethanes is strongly influenced by the polyols used; e.g. ethylene oxide-rich polyether polyols have a higher tendency to absorb water than propylene oxide-rich polyether polyols. Water absorption leads to material softening, swelling and susceptibility to mechanical damage. Although the use of polyester polyols can reduce water absorption, such products are susceptible to hydrolysis-induced polymer degradation.

Semi-crystalline hydrocarbon compounds which can react with isocyanates via OH, NH or SH groups and thus help to reduce the water absorption can be helpful

Polyurethane hybrid material accessible. Examples of such compounds are known from the literature. These are polyacrylates and / or polystyrenes containing corresponding isocyanate-reactive groups.

JOURNAL OF POLYMER SCIENCE, Part A, Polymer Chemistry 2013, Vol. 51, pages 318-326 describes the preparation of polystyrene diols, which are described, for example, in chlorobenzene as

Solvent be reacted with diisocyanate to polyurethane. After removal of the solvent and drying, a polyurethane precipitate is obtained. The solvent is required for the reaction to take place to the polyurethane.

Journal of Applied Polymer Science, vol. 70, pages 613-627 (1998) discloses poly (urethane-block-methyl methacrylate) copolymers and poly (urethane-block-styrene) copolymers in butanone

Solvent prepared by means of polyurethane macroazoinitiatoren (PUMAI). In a first step, these polyurethane macroazo initiators (PUMAI) are prepared from methylenediphenyl diisocyanate (MDI) and azobis (2-cyanopropanol (ACP) in butanone.) The resulting NCO-terminated

Radical initiator in butanone is reacted with hydroxypolycaprolactone (PCL) to PUMAI. Thereafter, these PUMAI are subjected to block copolymerization e.g. reacted with styrene. The yield is low. These block copolymers prepared in this way are compared with blends of polyurethane and polystyrene.

Polymer 46 (2005), pages 11294-11300 describes polyurethane-polystyrene copolymers, the 2-hydroxyethyl acrylate-terminated isophorone diisocyanate-polytetramethylene glycol NCO prepolymer is prepared by RAFT (Reversible Addition Fragmentation Chain Transfer) polymerization with styrene using 4 - ((benzodithioyl) methyl) benzoic acid as the RAFT agent. The Styrolkoniponente is polymerized on the already existing polyurethane. The resulting copolymer films show low water absorption (15-18%). Overall, however, the films of the polyurethane-polystyrene copolymers show a significantly increased hardness and tensile strength with a greatly reduced elongation at break compared to the pure films made of polyurethane.

The object of the present invention was to provide polyurethanes which have a low water absorption, which can be prepared simultaneously and without the use of solvents, and in which rapid phase stability of the mixture of the

Output components is achieved.

The aforementioned object could be achieved, surprisingly, by incorporating polystyrene and / or polyacrylonitrile into the polyurethane framework, specifically via the use of

Polystyrene polyols and / or polyacrylonitrile polyols as the starting compound, though

Polystyrene polyol compounds with number average molecular weights of> 1000 g / mol and polyacrylonitrile compounds with number average molecular weights of> 3000 g / mol are usually solid, whereby their immediate processibility in the conventional processing technology for the production of polyurethanes is severely limited. For this reason, polystyrene polyols and polyacrylonitrile could previously be used only in solvents.

The process according to the invention is distinguished, in particular, by preparing NCO prepolymers from polystyrene polyols and / or polyacrylonitrile polyols with polyisocyanates, which are processed in a further step to give polyurethane hybrid polymers.

The invention provides polyurethane hybrid polymers of polyisocyanates (A) and isocyanate-reactive group-containing compounds (B) in a molar ratio of NCO groups to OH and / or NPI groups of from 0.8 to 1 to 3.5: 1 from the reaction of a) at least one NCO prepolymer as polyisocyanate (A),

b) at least one isocyanate-reactive group-containing compound (B) from the group consisting of polyester polyols, polyether polyols, Polyetheresterpolyolen and amino-terminated polyethers and

c) optionally chain extenders and / or crosslinkers (C) in the presence of d) optionally catalysts (D)

e) optionally auxiliaries and / or additives (E), wherein the NCO prepolymer has an NCO content of 10 to 40 wt .-% and at least one polyisocyanate (A ') from the group consisting of aliphatic and aromatic polyisocyanates and at least one polyol component (B ') from the group consisting of polystyrene polyol having a number average molecular weight of> 1000 g / mol, preferably> 1500 g / mol, more preferably 2000 g / nolole and polyacrylonitrile polyol having a number average molecular weight of> 2000 g / mol, preferably> 3000 g / mol, and optionally at least one further polyol (B ") is prepared from the group consisting of polyester polyols, polyether polyols and polyetheresterpolyols.

Another object of the invention is a process for the preparation of polyurethane hybrid polymers, wherein polyisocyanates (A) containing isocyanate-reactive groups

Compounds (B) and optionally chain extenders and / or crosslinkers (C) in the presence of optionally catalysts (D) and optionally auxiliaries and / or additives (E) in a molar ratio of NCO groups to OH and / or NH groups of 0.8 to 1 to 3.5 to 1 are reacted, characterized in that i) as polyisocyanate (A) an NCO prepolymer having an NCO content of 10 to 40 wt .-% is used,

which comprises at least one polyisocyanate (A ') selected from the group consisting of aliphatic and aromatic polyisocyanates and at least one polyol component (B') selected from the group consisting of polystyrene polyol having a number-average molecular weight of> 1000 g / mol, preferably> 1500 g / mol, particularly preferably 2000 g / mol and polyacrylonitrile polyol having a number average molecular weight of> 2000 g / mol, preferably> 3000 g / mol, and optionally at least one further polyol (B ") from the group consisting of polyester polyols, polyether polyols and polyether ester polyols, and ii) as isocyanate-reactive group-containing compound (B) at least one compound from the group consisting of polyester polyols, polyether polyols, polyether ester polyols and amino-terminated polyethers is used. The process according to the invention enables the direct incorporation of polystyrene and / or polyacrylonitrile units into polyurethanes.

The polystyrene and polyacrylonitrile polyols used are compounds which have the following formula and are prepared as follows:

2n RCH = CH ₂ + H [0-R '] _{m is} 0-C (0) -R ", -SC (S) -SR' -C (0) -0 [-R'-0] _m -H ->

H- [0-R'-] _m OC (O) -R "- [CH ₂ -CH (R) -] _n SC (S) -S - [- CH ₂ -CH (R) -]" - R "-C (O) -O [-R'-O] _m -H

Here R is an aromatic radical C6H5 or a nitrile radical CN. N, n ', m and m' are each an integer> 1. R 'and R "are alkylene radicals.

As the isocyanate-reactive compound (B) with which the isocyanate-terminated prepolymers can be processed, any compound useful in polyurethane production having at least two isocyanate-reactive groups having hydrogen atoms can be used. Polyetherpolyols, polyesterpolyols, polyetheresterpolyols and amino-terminated polyethers or mixtures thereof are preferably used as compounds which are reactive toward isocyanate groups. Particularly preferred are polyether polyols.

As component (B "), preference is given to polyether polyols, polyester polyols and

Polyetheresterpolyole or mixtures thereof used.

Suitable polyether polyols may be prepared by known methods, for example by anionic polymerization with alkali metal hydroxides, such as sodium or potassium hydroxide, or alkali metal such as sodium, sodium or potassium, or potassium isopropoxide as catalysts and with the addition of at least one starter molecule containing 2 to 8 reactive hydrogen atoms bound, or by cationic polymerization with Lewis acids, such as antimony pentachloride and borofluoride etherate, or bleaching earth as catalysts of one or more alkylene oxides having 2 to 4

Carbon atoms are prepared in the alkylene radical. Next, as catalysts also

Multimetal cyanide compounds, so-called DMC catalysts can be used. Suitable alkylene oxides are, for example, tetrahydrofuran, 1, 3-propylene oxide, 1, 2 or 2,3-butylene oxide, styrene oxide and preferably ethylene oxide and 1, 2-propylene oxide. The alkylene oxides can be used individually, alternately in succession or as mixtures. Suitable starter molecules are, for example: water, organic dicarboxylic acids such as succinic acid, adipic acid, phthalic acid and terephthalic acid, aliphatic and aromatic, optionally N-mono-, N, N and N, N'-dialkyl-substituted diamines having 1 to 4 carbon atoms in the alkyl radical, such as optionally mono- and dialkyl-substituted ethylenediamine, diethylenetriamine, triethylenetetramine, 1,3-propylenediamine, 1,3- or 1,4-butylenediamine, 1, 2, 1, 3, 1, 4, 1, 5 and 1, 6 Hexamethylenediamine, phenylenediamines, 2,3-, 2,4- and 2,6-toluenediamine and 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane.

Also suitable as starter molecules are: alkanolamines, such as ethanolamine, diethanolamine, N-methyl and N-ethyl-ethanolamine, N-methyl and N-ethyldiethanolamine and triethanolamine and ammonia. Preference is given to using polyhydric, especially dihydric to polyhydric alcohols, such as ethanediol, 1,2- and 1,3-propanediol, diethylene glycol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, glycerol, trimethylolpropane, pentaerytrite, glucose , Fructose and sucrose.

The polyether polyols, preferably polyoxyethylene, polyoxypropylene, and polyoxypropylene polyoxyethylene polyols, have a number average functionality of from 1.5 to 5.0, preferably from 1.8 to 4.2, and more preferably from 2.0 to 3.5, and number average molecular weights of preferably 32 to 1500, more preferably 60 to 1000 and especially 60 to 800.

The different functionalities are preferred by the use

get different starter.

The polyester polyols which can be used according to the invention have predominantly hydroxyl end groups.

In contrast, they have carboxylate end groups only to a very minor extent.

Suitable polyester polyols may have molecular weights in the range from 250 Da to 10,000 Da, preferably from 300 Da to 6000 Da. The number of hydroxyl end groups in the polyester polyol can be 2 to 6. The average functionality of the polyester polyols is preferably> 2 to <3.

Low molecular weight polyols which can be used to prepare the polyesterpolyols are preferably those having hydroxyl functionalities of 2 to 6. In preferred embodiments, they have between 2 and 36, more preferably between 2 and 12, carbon atoms. Preferably, at least 90 mol%, particularly preferably 100 mol%, of all alcohol groups of the alcohol component of which the polyester is synthesized originate from unbranched a, w-diols (based on a total content) Alcohol groups in the alcohol component from which the polyester is built up, from 100 mol%)). Very particular preference is given to polyols from the group:

Ethylene glycol and diethylene glycol including their higher homologues, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1, 10-decanediol, 1,1,1-undecanediol, 1,12-dodecanediol, including their higher homologs.

Of course, mixtures of these polyols with each other or with other polyols can be used, in the latter case, the said polyols preferably contribute at least 90 mol% of all hydroxyl groups.

Generally possible, although not preferred, is the additional use of polyols from the group:

1, 2-propanediol, dipropylene glycol and its higher homologues, 2-methylpropanediol-l, 3,

Neopentyl glycol, 3-Methylpentandiol-l, 5, glycerol, pentaerythritol, 1,1,1-trimethylolpropane and carbohydrates having 5 to 12 carbon atoms (such as isosorbide). These can also be mixed with each other or with other polyols. In any case, however, contribute

Use of these polyols, the unbranched a, w-diols identified above as very particularly preferred at least 90 mol% of all hydroxyl groups.

Low molecular weight polycarboxylic acid equivalents which can be used to prepare the polyesterpolyols have, in particular, 2 to 36, preferably 2 to 12, carbon atoms. The low molecular weight

Polycarboxylic acid equivalents may be aliphatic or aromatic. They are preferably selected from the group:

Succinic acid, fumaric acid, maleic acid, maleic anhydride, glutaric acid, adipic acid,

Sebacic acid, suberic acid, azelaic acid, 1, 10-decanedicarboxylic acid, 1. 1 2-dodecane-carboxylic acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, pyromellitic acid and trimellitic acid.

Of course, it is also possible to use mixtures of these low molecular weight polycarboxylic acid equivalents with one another or with other polycarboxylic acid equivalents, in which latter case the polycarboxylic acids mentioned preferably contribute at least 90 mol% of all the carboxyl groups. If hydroxycarboxylic acids, including their internal anhydrides (lactones), are used or co-used, it is preferred to use caprolactone and / or 6-hydroxycaproic acid.

As the polyetherester polyols, the compounds described in EP1702941A1 can be used.

As amino-terminated polyether polyols, for example, the so-called Jeffamine® Huntsman, such as. B. D-230, D-400, D-2000, T-403, T-3000, T-5000, or corresponding products of BASF, such as. As polyetheramine D230, D400, D200, T403, T5000 or polytetrahydrofuranamines (BASF product: Polytetrahydrofuranamin 1 700) are used.

As chain extenders and / or crosslinkers (C) substances are used which have at least two isocyanate-reactive groups, wherein the substances have at least one free SH, OH or NH group. Specifically, the following compounds are illustrative: ethylenediamine, 1,2-propanediol, 1,3-propanediol, glycerol, 2,3-butanediol, 1,3-butanediol, 1,4-butanediol, 2-methylpropan-1, 3-diol, 1, 2-pentanediol, l, 3-pentanediol, 1, 4-pentanediol, l, 5-pentanediol, 2,2-dimethyl-propane-l, 3-diol, 2-methyl-butan-l, 4- diol, 2-methylbutan-1,3-diol, monoethylene glycol, 1,1-trimethylolethane, 3-methyl-1,5-pentanediol, 1,1-trimethylolpropane, 1,6-hexanediol, 1,7- Heptanediol, 2-ethylhexane-1, 6-diol, 1,8-octanediol, 1, 9-nonanediol, 1, 10-decanediol 1, 1-unddecanediol, 1, 12-dodecanediol, diethylene glycol, triethylene glycol, 1, 4 Cyclohexanediol, l, 3-cyclohexanediol, toluenediamines or derivatives thereof, such as 3,5-diethyl-tolylene-2,4-diamine, triethylene glycol diamine and water. Preferably, the molecular weight of the chain extender in this preferred embodiment is between 100 and 400 g / mol, particularly preferably between 100 and 200 g / mol and in particular between 100 and 150 g / mol.

As polyisocyanates (A '), preference is given to using aromatic polyisocyanates for the preparation of the prepolymers in the case of the subsequent reaction with polystyrene polyols.

Preferably, aromatic polyisocyanates of the general formula R (NCO) z are used, wherein R is a polyvalent organic radical having an aromatic, and z is an integer of at least 2. Examples for this are: 4,4'-diisocyanatobenzene, 1, 3-diisocyanato-o-xylene, 1, 3-diisocyanato-p-xylene, 1, 3-diisocyanato-mxylol, 2,4-diisocyanato-l-chlorobenzene, 2,4-diisocyanato -l-nitrobenzene, 2,5-diisocyanato-1-nitrobenzene, m-phenylene diisocyanate, p-phenylene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, mixtures of 2,4- and 2,6-toluene diisocyanate, 1, 5-naphthalene diisocyanate, 1-methoxy-2,4-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, 4,4'-biphenylene diisocyanate, 3,3'-dimethyl 4,4'-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate and 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate; Triisocyanates such as 4,4 ', 4 "-triphenylmethane triisocyanate and 2,4,6-toluene triisocyanate, and tetraisocyanates such as 4,4'-dimethyl-2,2'-5,5'-diphenylmethane tetraisocyanate.

Particularly preferred are toluene diisocyanates, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenyl methane diisocyanate, Polymethylenpolyphenylenpolyisocyanat, and derivatives, such as modified compounds of these isocyanates in the form of carbodimides, urethyimines, and / or isocyanurates and mixtures thereof.

For the preparation of the prepolymers in the case of the subsequent reaction with

On the other hand, polyacrylonitrile polyols preferably contain the known aliphatic,

Cycloaliphatic and / or araliphatic polyisocyanates and mixtures thereof in question.

Exemplary here are l, 6-hexamethylene diisocyanate, isophorone diisocyanate,

Pentamethylene diisocyanate, xylylene diisocyanate 1, 4-cyclohexane diisocyanate (CHDI),

Methyldicyclohexyldiisocyanate (H12-MDI) and the modified compounds of these isocyanates in the form of allophanates, biurets and carbodiimides, and dimers and trimers of isocyanates (U. Meier-Westhues, Polyurethanes - Coatings, Adhesives and Sealants, Hannover: Vincentz Network, 2007 (European Coatings Tech Files) ISBN 3-87870-334-1).

Particular preference is l, 6-hexamethylene diisocyanate, isophorone diisocyanate and

Methyldicyclohexyldiisocyanat

Suitable polyols (B ') for the preparation of the isocyanate-terminated prepolymers are the polyols based on acrylonitrile or styrene accessible via RAFT polymerization.

As catalysts (D) it is possible to use all catalysts customary for polyurethane production. Such catalysts are described, for example, in "Kunststoffhandbuch, Volume 7, Polyurethanes", Carl Hanser Verlag, 3rd edition 1993, Chapter 3.4.1. In this case, for example, organic metal compounds, preferably organic tin compounds, such as tin (II) salts of organic carboxylic acids, for example, tin (II) acetate, tin (II) octoate, tin (II) ethylhexanoate and tin (II) laurate, and the dialkyltin (IV) salts of organic carboxylic acids, eg, dibutyltin diacetate , Dibutyltin dilaurate, dibutyltin maleate and dioctyltin diacetate, as well as bismuth carboxylates such as bismuth (III) neodecanoate, bismuth 2-ethylhexanoate and bismuth octanoate or mixtures. Other possible catalysts are strongly basic amine catalysts. Examples of these are amidines, such as 2,3-dimethyl-3,4,5,6-tetrahydropyrimidine, tertiary amines, such as triethylamine,

Tributylamine, dimethylbenzylamine, N-methyl, N-ethyl, N-cyclohexylmorpholine, N, N, N ', N'-tetramethylethylenediamine, N, N, N', N'-tetramethylbutanediamine, N, N, N ', N' Tetramethylhexanediamine, pentamethyldiethylenetriamine, tetramethyldiaminoethyl ether, bis (dimethylaminopropyl) urea, dimethylpiperazine, 1, 2-dimethylimidazole, 1-azabicyclo- (3, 3, 0) -octane and preferably 1, 4- Diazabicyclo (2,2,2) octane and alkanolamine compounds such as triethanolamine, triisopropanolamine, N-methyl and N-ethyl-diethanolamine and dimethylethanolamine. The catalysts can be used singly or as mixtures. If appropriate, mixtures of metal catalysts and basic amine catalysts are used as catalysts (D). The catalysts (D) can be used, for example, in a concentration of 0.001 to 5 wt .-%, in particular 0.05 to 2 wt .-% as catalyst or catalyst combination, based on the weight of components (A) to (E) ,

As auxiliaries and / or additives (E) blowing agents, additives for thixotropy, fillers, antioxidants, dyes, pigments, release agents, optical brighteners and stabilizers against heat, light and / or UV radiation, plasticizers or surface-active substances can be used.

Examples of suitable release agents are: reaction products of fatty acid esters with polyisocyanates, salts of polysiloxanes containing amino groups and fatty acids, salts of saturated or unsaturated (cyclo) aliphatic carboxylic acids having at least 8 carbon atoms and tertiary amines and in particular internal release agents such as carboxylic acid esters and / or amides prepared by esterification or amidation of a mixture of montanic acid and at least one aliphatic carboxylic acid having at least 10 C atoms with at least the functional

Alkanolamines, polyols and / or polyamines having molecular weights of 60 to 400 g / mol, as disclosed for example in EP 153 639, mixtures of organic amines, metal salts of stearic acid and organic mono- and / or dicarboxylic acids or their anhydrides, such as in DE A-3 607 447, or mixtures of an imino compound, the metal salt of a carboxylic acid and optionally a carboxylic acid, as disclosed, for example, in US 4,764,537. As blowing agents, it is possible to use all blowing agents known for the preparation of polyurethanes. These may include chemical and / or physical blowing agents. Such blowing agents are described, for example, in "Kunststoffhandbuch, Volume 7, Polyurethane", Carl Hanser Verlag, 3.

Edition 1993, chapter 3.4.5. Chemical blowing agents are compounds which form gaseous products by reaction with isocyanate. Examples of such propellants are water or carboxylic acids. By physical blowing agents are meant compounds which are dissolved or emulsified in the starting materials of polyurethane production and evaporate under the conditions of polyurethane formation. These are, for example, hydrocarbons, halogenated hydrocarbons and other compounds, such as fluorinated alkanes (hydrofluorocarbons - eg HFC245fa or HFC365mfc), such as perfluorohexane, chlorofluorocarbons, hydrofluoroolefins (HF01336mzz, HF01233zd)) and ethers, esters, ketones and / or acetals ,

The polyurethane hybrid polymers can be used for the production of hydrophobic compact coatings and hydrophobic hard and soft foams.

Examples:

Used raw materials:

KOH purity 98% Sigma-Aldrich Chemie GmbH

CS2 purity 99% Sigma-Aldrich Chemie GmbH

2-bromopropionic acid purity> 99% Sigma Aldrich Chemie GmbH

Cr (III) Cl ₃ purity 99% Acros Organ

Toluene purity 99.8% Sigma-Aldrich Chemie GmbH

PO (propylene oxide) purity 99.5% Sigma-Aldrich Chemie GmbH

Production RAFT Reasenz:

Provision of potassium trithiocarbonate and reaction of K CS ₃ with 2-

Bromopropionic acid to trithiocarbonate intermediate I

Preparation of the potassium trithiocarbonate was as disclosed in Macromolecules (2015), Vol. 45, page 4958. In a flask, 1230 ml of deionized water and 215 g of KOH were added with stirring and then 273 g of carbon disulfide were added and stirred.

At room temperature, 250 g of 2-bromopropionic acid was added dropwise and then stirred for 72 hours. The reaction solution was washed with CH 2 Cl 2 and acidified with concentrated HCl, filtered and dried. Volatiles were separated on a rotary evaporator. The yield of the intermediate I is 45.32 g or 36% (theoretical: 207.8 g, 0.82 mol). Propoxylation of Intermediate Compound I to RAFT Reagent II

In an autoclave, 18.75 g of the intermediate compound I in 120 g of toluene and 0.16 catalyst (TCl.sub.2) were initially introduced under nitrogen, then 58 g of propylene oxide were metered in in a nitrogen atmosphere, heated to 80 ° C. and stirred for 3.5 hours Connection became the

Reaction temperature increased to l00 ° C and stirred for 6 hours at this temperature.

After cooling the autoclave was filtered and rotary evaporated. The yield was 86%.

The RAFT reagent II may, for example, have the following structure:

H [-O-CH ₂ -CH (CH ₃ )] _m -O-C (O) -CH (CH ₃ ) -SC (S) -S-CH (CH ₃ ) -C (O) -O- [ CH ₂ -CH (CH ₃ ) -O-] _{m '} H with m and in'> 1

Reaction of RAFT reagent II with styrene to give a, w -polystyrene-di-ol TTT

19.31 g of RAFT reagent II, 108.5 g of styrene, 521.8 g of dioxane and 2.58 g of 2,2'-azobis (2,4-dimethylvaleronitrile) were initially charged in a three-necked flask. Then the atmosphere inside the apparatus was replaced by nitrogen. The reaction was carried out at 60 ° C under nitrogen for 22 hours. After the reaction was evaporated under vacuum while rotating and dried. The yield was 87.97 g (69%). The number average molecular weight was 2100 g / mol.

Preparation of Polyurethane-Polystyrene Hybrid Polymer and Polyurethane Polymer via NCO-

prepolymers

Used output connections:

Polystyrene diol III: number average molecular weight M _w : 2100 g / mol,

Glass transition temperature T _G : 40 ° C, decomposition temperature T _D : 190 ° C

Catalyst Dabco 33LV from Air Products Polyisocyanate 1 4,4'-diphenylmethane diisocyanate having an isocyanate content of 33.6

% By weight (Desmodur® 44M from Covestro Deutschland AG)

Polyisocyanate containing 2 oligomeric uretonimines 4,4 '-Diphenylmethandiisocyanat having an isocyanate content of 29.5 wt .-% (Desmodur® CD-S from Covestro Deutschland AG)

Polyether polyol 1 Gylzerin started polyether polyol from propylene oxide having an OH number of 42 mg KOH / g

Polyetherpolyol 2 Linear, propylene glycol initiated propylene oxide polyether polyol having an OH number of 56 mg KOH / g polyether polyol 3 glycerol started polyether polyol of propylene oxide and ethylene oxide having an OH number of 35 mg KOH / g

tripropylene

The polystyrene diol III was crushed, added at 80 ° C to the polyisocyanate component, where it dissolved and was converted to the NCO prepolymer.

The second NCO prepolymer was treated in the same way with the corresponding liquid

Polyol mixture produced.

The respective materials and quantities are shown in Table 1.

Table 1:

Both NCO prepolymers could be converted to the polyurethane under the conditions customary in polyurethane chemistry (room temperature, intensive stirring).

Both NCO prepolymers were reacted according to the amounts shown in Table 2 to the polyurethane or polyurethane-polystyrene hybrid polymer.

Table 2:

At first, there were no significant differences in processing. The reaction mixtures cleared after two minutes of stirring, but the reaction mixture containing the polystyrene diol prepolymer solidified much more rapidly. Surprisingly, even with a small proportion (4.5% by weight in the end product) of polystyrene diol, a significantly lower tendency (about 7%) of the end product to absorb water was found, while the other physical-mechanical properties were equally good compared to the comparison product.

Specimen preparation:

First, the catalyst with the polyol was intimately mixed with an Ika stirrer RW20 for 5 minutes. This mixture was added at room temperature to the amount of the respective prepolymer put in a paper cup and slowly stirred with a wooden stick. The mass of about 80g was transferred to a non-tempered aluminum mold (9x9x2cm ³ ) with removable frame. The reaction mixture was cured under these conditions.

Test Methods:

NCO content in [wt%] according to EN ISO 11909: 2007

Viscosity in [mPas] according to DIN 53019-1 (2008) at 25 ° C

Hardness in [Shore A] according to DIN 53506

Water absorption in [% by weight] Based on ISO 15512 (2016):

From the cast plates round discs were punched with 5cm diameter, their thickness was about 1 cm. They were dried for 4 days at 50 ° C in a desiccator with desiccant to constant weight. Thereafter, the desiccant was replaced with water. The samples were stored for three days at 50 ° C under these conditions before water uptake was determined to increase weight. Tension / tension measurement in

[N / mm ² ] according to DIN 53571 (1986)

DSC measurement according to EN ISO 11357-1 (2009)

Gel time in [min] is the time that has elapsed since the beginning of the mixing process until reaching the

Gel point passes. The gel point was determined with the Gel Timer from Gelnorm.

Compatibility in [min] is the time required to stir the reaction

components from a cloudy emulsion to a clear homogeneous mixture.

A preparation of polyurethane hybrid polymers via the so-called one-shot process was surprisingly not possible. Even at a processing temperature of 50 ° C, the polystyrene diol apparently does not dissolve sufficiently rapidly in a reaction mixture consisting of polyether polyol, catalyst and diphenylmethane diisocyanate to participate in the reaction. However, it has surprisingly been found that the preparation can be carried out solvent-free, if the preparation is carried out via the Prepolymerweg.

Claims

Claims:

1. A process for the preparation of polyurethane hybrid polymers, wherein polyisocyanates (A) with isocyanate-reactive group-containing compounds (B) and optionally chain extenders and / or crosslinkers (C) in the presence of optionally catalysts (D) and optionally auxiliaries and / or additives ( E) in a molar ratio of

NCO groups to OH and / or NH groups of 0.8 to 1 to 3.5 to 1 are reacted, characterized in that i) as the polyisocyanate (A) is an NCO prepolymer having an NCO content of 10 up to 40% by weight is used,

which comprises at least one polyisocyanate (A ') selected from the group consisting of aliphatic and aromatic polyisocyanates and at least one polyol conjugate (ET) selected from the group consisting of polystyrene polyol having a number-average molecular weight of> 1000 g / mol, preferably> 1500 g / mol preferably 2000 g / ol and polyacrylonitrile polyol having a number average molecular weight of> 2000 g / mol, preferably> 3000 g / mol, which have the following formula and are prepared as follows:

2n RCH = CH ₂ + H- [O-R '-] _m O-C (O) -R "-SC (S) -SR" -C (O) -O [-R'-O] _m' - H ->

FI- [O-R '-] m O-C (O) -R "- [CH ₂ -CH (R) -] _n SC (S) -S - [- CH ₂ -CH (R) -]" · - R '-C (0) -0 [-R'- 0] _{m -H,}

wherein R is an aromatic radical C _E H _S or a nitrile group CN, n, n ', m and m' each represent an integer> 1 and R 'and R "are independently alkylene groups and optionally at least one further polyol ( B ") is prepared from the group consisting of polyesterpolyols, polyetherpolyols and polyetheresterpolyols, and ii) at least one compound (B) containing isocyanate-reactive groups

Compound from the group consisting of polyester polyols, polyether polyols, polyetherester polyols and amino-terminated polyethers is used.

2. Polyurethane hybrid polymers of polyisocyanates (A) and isocyanate-reactive

Group-containing compounds (B) in a molar ratio of NCO groups to OH and / or NH groups of 0.8 to 1 to 3.5 to 1 prepared from the reaction of a) at least one NCO prepolymer as the polyisocyanate (A ) b) at least one isocyanate-reactive group-containing compound (B) from the group consisting of polyester polyols, polyether polyols, polyether ester polyols and aminotermi-defined polyethers and

e) optionally adjuvants and / or additives (E), wherein the NCO prepolymer has an NCO content of 10 to 40 wt .-% and at least one polyisocyanate (A ') from the group consisting of aliphatic and aromatic polyisocyanates and at least one polyol component (B ') from the group consisting of polystyrene polyol having a number average molecular weight of> 1000 g / mol, preferably> 1500 g / mol, more preferably 2000 g / mol and polyacrylonitrile polyol having a number average molecular weight of> 2000 g / mol , preferably> 3000 g / mol, have the following formula and are prepared as follows: 2n RCH = CH ₂ + H- [O-R '-] _m 0-C (O) -R "-SC (S) -SR" -C (O) -O [-R'-O] _m -H ->

H- [O-R'-] _m O-C (O) -R "- [CH ₂ -CH (R) -] _n SC (S) -S - [- CH ₂ -CH (R) -]" R 'is -C (O) -O [-R'-O] _m -H, where R is an aromatic radical CeHs or a nitrile radical CN, n, n', m and m 'are each an integer> 1 and R 'and R "are independently alkylene radicals and if appropriate at least one further polyol (B") is hergesteht from the group consisting of polyester polyols, polyether polyols and polyetheresterpolyols.

3. Use of Polyurethanbybridpolymere for the production of hydrophobic compact coatings and hydrophobic hard and soft foams.