Isocyanate curing with bound water

Abstract

The present invention proposes a multi-component composition comprising an isocyanate-reactive compound, an isocyanate compound, a source of chemically bound water, optionally a catalyst and optionally a CO2 scavenger. Furthermore, the present invention proposes a process for preparing a polyurea polymer by curing the multi-component composition with a source of chemically bound water. Finally, the present invention proposes the use of a specific source of chemically bound water for curing the polyurea polymer obtainable by the process and further the multi-component composition.

Description

[Technical field]

[0001] The present invention relates to a multi-component composition comprising an isocyanate-reactive compound, an isocyanate compound, a source of chemically bound water, optionally a catalyst and optionally a CO2 scavenger. Furthermore, the present invention relates to a process for preparing a polyurea polymer by curing the multi-component composition with a source of chemically bound water. Finally, the present invention relates to a polyurea polymer obtainable by the process and the use of a specific source of chemically bound water for curing the multi-component composition. [Background technology]

[0002] Polyurea is a type of elastomer that is the reaction product of an isocyanate component and a polyfunctional amine component or water. The isocyanate component can be aromatic or aliphatic. The isocyanate component can be a monomer, oligomer, prepolymer or polymer. Polyurea polymers are particularly suitable as adhesives, waterproofing agents, coating agents, potting materials and self-leveling materials.

[0003] The reaction of isocyanates with water to form polyureas has been used for a long time, but suffers from poor pot life times and leveling issues. Current formulations show a strong tendency to bubble formation due to the reaction between isocyanates and water, especially high thickness. In other words, the reaction between isocyanates and water is too fast for sufficient degassing or CO2 capture by basic additives, so-called "CO2 scavengers". Therefore, there has been a strong need to slow down the reaction and extend the pot life time.

[0004] In US2015 / 0259465A1 (Abstract), this problem was partially solved by a two-component polyurethane composition containing a polyol, a polyisocyanate, a blocked amine (i.e., oxazolidino or aldimino groups - see claim 1) and a bismuth(III) or zirconium(IV) catalyst. The composition was easy to process, cured quickly and bubble-free, and had unexpectedly high strength when in the cured state. The composition could additionally contain water or water-generating substances (claim 14) that contained water, either coordinated or as water of crystallization, e.g. inorganic compounds.

[0005] However, EP 2706073A1 only concerns urethane polymers, not polyurea polymers. Moreover, the idea of ​​combining blocked amines with a small amount of water has disadvantages. Blocked aldimines, for example, react with some added water, resulting in primary amines and aldehydes. The odoriferous aldehydes with high VOC content are then released. Moreover, the equilibrium of the blocked amine / water / polyisocyanate system is strongly on the side of NCO reaction products, and the reaction is not strongly retarded. The present invention, in contrast, does not use blocked amines.

[0006] US 2017 / 355862 A1 (claim 1) discloses a fire protection composition comprising a material A containing an isocyanate compound, a material B containing a reactive component capable of reacting with the isocyanate compound and selected from the group consisting of compounds having at least two amino groups, the amino groups being, independently of one another, primary and / or secondary amino groups, and a material C containing an ablatively acting fire protection additive. Furthermore, claim 12 mentions inter alia aluminium hydroxide, ettringite and hydrous zeolite as component C. However, only calcium carbonate is used in the experiments of US 2017 / 355862 A1.

[0007] Paragraph

[0095] of US2017 / 355862A1 mentions that material C is divided so that there is no reaction or interference between the compounds contained in the composition, nor between these compounds and compounds of other materials. This may have worked for calcium carbonate, but not for aluminum hydroxide, ettringite and hydrous zeolite. These water-containing compounds would have reacted with the isocyanate component and consequently lost their ablative fire-stopping capabilities. Aluminum hydroxide, ettringite and hydrous zeolite are therefore not permitted in US2017 / 355862A1. On the other hand, US2017 / 355862A1 is silent about the usefulness of these compounds for isocyanate curing. Summary of the Invention [Problem to be solved by the invention]

[0008] The object of the present invention was to essentially avoid the disadvantages of the prior art. In particular, the rate of polyurea formation, or in other words the polyisocyanate / water reaction, should be slowed down, thus allowing an increase in pot life time. By slowing down the polyisocyanate / water reaction, foaming should become more controllable. However, both foamed and non-foamed reaction products were desired. The physical properties of the reaction product should be satisfactory.

[0009] These objects are achieved by the technical features of the independent claims. The dependent claims relate to preferred embodiments. [Means for solving the problem]

[0010] Surprisingly, it has been found that chemically bound water slows down the polyurea formation reaction, thus increasing the pot life time and making foam formation more controllable. This reaction may be carried out with or without a CO2 scavenger as an additional key ingredient. In the latter, the formed CO2 is converted, for example, to CaCO3.

[0011] In the present case, a primary reaction occurs between the polyol and / or polyfunctional amine with the NCO groups. A secondary reaction occurs by reaction of the NCO groups with chemically bound water via the amine groups, with simultaneous formation of CO2. This second reaction is delayed by masking of the water, thus leading to an increase in the overall pot life of the system. The water is chemically bound as water of crystallization, such as in ettringite. The CO2 scavenger can be, for example, Ca(OH)2, but the CO2 scavenger can also be a water-containing crystalline compound, such as ettringite itself.

[0012] According to a first aspect, the present invention provides a multi-component composition comprising: (A) an isocyanate-reactive compound; (B) an isocyanate compound selected from the group consisting of polyisocyanates and NCO-terminated prepolymers; (C) a source of chemically bound water; (D) optionally a catalyst; and (E) optionally a CO2 scavenger. The source of chemically bound water acts as an isocyanate curing agent in the multi-component composition.

[0013] General definition As used herein, the term "multi-component" refers to a composition that includes two or more components, each of which may also be a mixture of several compounds. Parts of the multi-component may be mixed together as needed, and the multi-component may also be several separate packaged items that can be mixed on-site for use.

[0014] As used herein, the term "prepolymer" refers to a monomer or system of monomers that have been reacted to an intermediate molecular mass state. This material can be further polycondensed via reactive groups to a fully cured, high molecular weight state. Usually, the reaction products of polyols or polyfunctional amines with polyisocyanates are NCO-terminated.

[0015] As used herein, the term "additive" refers to additives that are included in a formulated system to enhance its physical or chemical properties and provide a desired result. Such additives include, but are not limited to, dyes, pigments, toughening agents, impact modifiers, rheology modifiers, plasticizers, thixotropes, natural or synthetic rubbers, fillers, reinforcing agents, thickeners, opacifiers, inhibitors, fluorescent or other markers, heat degradation inhibitors, heat resistance agents, surfactants, wetting agents, defoamers, dispersants, flow or slip aids, biocides, and stabilizers.

[0016] As used herein, the term "alkyl", either by itself or in combination with other alkyl further terms, is understood to mean the radical of an aliphatic saturated hydrocarbon group, which may be branched or unbranched, for example methyl, ethyl, propyl, butyl, isobutyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl or dodecyl or isomers thereof.

[0017] As used herein, the term "alkenyl", either by itself or in combination with other alkenyl further terms, is understood to mean a straight or branched radical having at least one double bond, such as vinyl, allyl, propenyl, butenyl, butadienyl, pentenyl, pentadienyl, hexenyl or hexadienyl or an isomer thereof.

[0018] As used herein, the term "cycloalkyl", either by itself or in combination with other cycloalkyl further terms, is understood to mean a fused or non-fused, saturated, monocyclic or polycyclic hydrocarbon ring, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl or its isomers.

[0019] As used herein, the term "alkoxy", either by itself or in combination with other alkoxy further terms, is understood to mean a linear or branched, saturated, radical having the formula -O-alkyl, wherein the term "alkyl" is as defined above, e.g. methoxy, ethoxy, propoxy, butoxy, pentoxy or hexoxy or its isomers.

[0020] As used herein, the term "aryl", either by itself or in combination with other aryl further terms, is understood to include fused or non-fused aryl such as phenyl or naphthyl, where phenyl is optionally substituted with 1-5 groups and naphthyl is optionally substituted with 1-7 groups. The term "aryloxy" means -O-aryl. The term "arylalkoxy" means -O-alkyl-aryl and alkylaryloxy means -O-aryl-alkyl. The term "aryl" is also meant to include heteroaryl.

[0021] As used herein, the term "hetero" is understood to mean a saturated or unsaturated radical interrupted by at least one heteroatom selected from the group consisting of oxygen (O), nitrogen (N) and sulfur (S).

[0022] The term "substituted" means that one or more hydrogens on the specified atom are replaced by a selected group, provided that the normal valence of the specified atom in its current state is not exceeded and that the substitution results in a stable compound. Combinations of substituents and / or variables are permissible only if such combinations result in stable compounds. Suitable substituents are meant to include, but are not limited to, C1-C6-alkyl-, cyano-, amino-, halogen-, hydroxyl-, or oxo (resulting in aldehyde or keto) groups.

[0023] The term "optionally substituted" means optional substitution with the specified groups, radicals or moieties. Unless otherwise specified, an optionally substituted radical may be mono- or polysubstituted, and the substituents in the case of polysubstitution may be the same or different from each other.

[0024] Unless otherwise stated, all percentages ("%") are "percent by weight." "Parts" are "parts by weight." All percentages of compositions are intended to add up to 100%.

[0025] The meaning of the term "comprising" should be interpreted as including all the specifically mentioned features as well as the optional unspecified ones, whereas the term "consisting of" includes only the features specified. The term "comprising" therefore includes the subordinate term "consisting of."

[0026] The radical definitions given above generally or within the preferred ranges apply to the final products as well as to the starting materials and intermediates. These radical definitions can be combined with each other as desired, i.e. including combinations between the general definitions and / or the respective preferred ranges and / or embodiments.

[0027] All embodiments and preferred embodiments disclosed in this specification can be combined as desired and are also considered to be covered within the scope of the present invention.

[0028] Unless otherwise stated, temperature refers to room temperature and pressure refers to atmospheric pressure.

[0029] Organic Isocyanate-Reactive Component (A) As organic isocyanate-reactive compound (A) it is possible to use any of the known compounds selected from the group consisting of polyols and polyfunctional amines and used in the production of polyurethanes.

[0030] It is preferable to use polyols having at least two hydroxyl groups, for example polyols having a functionality of 2 to 8. By way of example, it is possible to use compounds selected from the group of hydroxyl-terminated polyethers (polyether polyols), polyesters (polyester polyols) or polycarbonates (polycarbonate polyols) and mixtures thereof.

[0031] Polyether polyols are produced, for example, from epoxides, such as propylene oxide and / or ethylene oxide, or from tetrahydrofuran, together with hydrogen-active starter compounds, such as aliphatic alcohols, phenols, amines, carboxylic acids, water or compounds based on natural substances, such as sucrose, sorbitol or mannitol, using a catalyst. As polyester polyols, it is preferable to use dihydric or trihydric polyethers having an equivalent weight of about 100 to about 1500.

[0032] Polyester polyols are produced, for example, from aliphatic or aromatic dicarboxylic acids and polyhydric alcohols, polythioether polyols, polyesteramides, hydroxylated polyacetals and / or hydroxylated aliphatic polycarbonates, preferably in the presence of an esterification catalyst.

[0033] Polycarbonate polyols include those prepared by the reaction of diols such as 1,3-propanediol, 1,4-butanediol, diethylene glycol, triethylene glycol, or thiodiglycol with phosgene or diaryl carbonates such as diphenyl carbonate. These high molecular weight polyols may have a number average molecular weight of about 400 to about 15,000.

[0034] Suitable polyols are (poly)ethylene glycol, (poly)1,2- and 1,3-propylene glycol, (poly)2-methyl-1,3-propanediol, (poly)1,2-, 1,3-, 1,4- and 2,3-butanediol, (poly)1,6-hexanediol, (poly)1,8-octanediol, (poly)neopentyl glycol, (poly)cyclohexanedimethanol, (poly)cyclohexane-1,4-diol, (poly)1,4-bishydroxymethylcyclohexane, (poly)1,5-pentanediol, (poly)3-methyl-1,5-pentanediol, (poly)1,12-dodecanediol, diethylene glycol, triethylene glycol, Polyether polyols including, but not limited to, polyester polyols from aliphatic and / or aromatic sources, such as glycerol, sorbitol, trimethylolpropane, 1,2,4-butanetriol, 1,2,6-hexanetriol, pentaerythritol, polycaprolactone, adipates, terephthalate esters, polycarbonates, polyethylene glycol, polypropylene glycol, polytetramethylene glycol (all of which are possible starting materials for prepolymers with ≧2 -NCO functional groups). Polyhydroxylated natural oils and their derivatives, modified castor oil, etc. are also suitable. In addition, mixtures of the above compounds may be used.

[0035] Low molecular weight polyols can also be added as chain extenders or crosslinkers. Low molecular weight polyols refer to low molecular weight polyols having a molecular weight of less than 400 and at least two hydroxyl groups. Suitable polyols having a low molecular weight are in particular diols, triols or both, in each case having a molecular weight of less than 350, preferably 60-300, in particular 60-250. For example, aliphatic, cycloaliphatic and / or aromatic diols having 2 to 14, preferably 2 to 10, carbon atoms, such as ethylene glycol, 1,2-, 1,3-propanediol, 1,2-, 1,3-pentanediol, 1,10-decanediol, 1,2-, 1,3-, 1,4-dihydroxycyclohexane, diethylene and triethylene glycol, dipropylene and tripropylene glycol, 1,4-butanediol, 1,6-hexanediol, and triols such as bis(2-hydroxyethyl)hydroquinone, 1,2,4-, 1,3,5-trihydroxycyclohexane, glycerol and trimethylolpropane, as well as low molecular weight, hydroxyl-containing polyalkylene oxides based on ethylene oxide and / or 1,2-propylene oxide and the abovementioned diols and / or triols, can be used as starter molecules. Among the polyols listed above, castor oil is particularly mentioned and is preferred.

[0036] Polyfunctional amines are amines with a functionality of ≧2. The amine component may be linear or branched. The backbone of the amine component may contain aliphatic, aromatic, aliphatic-aromatic, cycloaliphatic and heterocyclic structures. The amine functionality itself is aliphatic, i.e., the nitrogen is not part of an aromatic ring. Preferred polyfunctional amines are amino-functional polyalkylene glycols, such as Jeffamine® from Huntsman Corp., e.g. Jeffamine D-230, D-400, D-2000, D-4000, T-403, T-3000, T-5000, ED-600, ED-2003, or amines of the general formula H2N-(CH2CH2-NH)o-CH2CH2-NH2, where o=1-10, such as diethylenetriamine. Polymers selected from polyamines, dendritic polyamines, polyimines (such as, for example, the Lupasol® type polyethyleneimines from BASF SE), polyamides, polyaminoamides, polyvinylamines or mixtures thereof are possible as the polyfunctional amine component. Also of interest are isophorone diamine and polyester diamines such as poly(1,4-butanediol) bis(4-aminobenzoate).

[0037] It should be noted that the multi-component compositions of the present invention do not contain blocked amines (such as oxazolidino or aldimino groups).

[0038] Isocyanate component (B) As component (B), any polyisocyanate and / or NCO-terminated prepolymer conventionally used to prepare polyurethane resins can be used herein. Suitable polyisocyanates include tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, isophorone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate (H12MDI), 1,4-cyclohexane diisocyanate (CHDI), 4,4'-diisocyanatodicyclohexyl-2,2-propane, p-phenylene diisocyanate, 2,4 and 2,6-toluene diisocyanate. The polyisocyanate may be any of the aliphatic, cycloaliphatic and aromatic polyisocyanates, including, but not limited to, tetramethyl xylene diisocyanate (TDI) or mixtures thereof, tolidine diisocyanate, 2,2'-, 2,4'- and 4,4'-diphenylmethane diisocyanate (MDI) or its oligomers or mixtures thereof, 1,2-naphthylene diisocyanate, xylylene diisocyanate, tetramethyl xylene diisocyanate (TMXDI) and mixtures thereof.

[0039] It is preferred to use toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), oligomeric MDI, hexamethylene diisocyanate (HDI), trimeric HDI and / or isophorone diisocyanate (IPDI). The above mentioned isocyanates can also be modified, for example to form uretedione, isocyanurate, carbodiimide, allophanate and urethane groups.

[0040] "Oligomeric MDI" is described by the following formula, where n=1-8: [ka]

[0041] "Trimeric HDI" is described by the formula: [ka]

[0042] The isocyanates used herein can also be isocyanate prepolymers containing NCO-terminated groups. These isocyanate prepolymers can be obtained by reacting the polyisocyanates described above to produce the prepolymers with isocyanate-reactive compounds such as polyols or polyfunctional amines at temperatures of, for example, 20 to 120° C. These prepolymers can have an isocyanate content of 2 to 25% and a number average molecular weight of about 500 to about 30,000.

[0043] The polyols and polyfunctional amines that can be used to produce the isocyanate prepolymers are known to those skilled in the art, and more preferably, the polyols and polyfunctional amines used to produce the isocyanate prepolymers are those included in the description of the organic isocyanate-reactive compounds (A).

[0044] Chemically bound water (C) The multi-component composition includes a source of chemically bound water to carry out the urea-forming reaction. In contrast to physically bound water, the term "chemically bound water" means water that is bound in crystalline form, for example in ettringite, calcium silicate hydrate (CSH), aluminum hydroxide, zeolites and the like. These substances may also be used in combination with each other and / or in combination with a CO2 capture agent. The source of chemically bound water according to the present invention may be selected from the group consisting of ettringite, calcium silicate hydrate, aluminum hydroxide, zeolites and mixtures thereof, preferably selected from the group consisting of ettringite, calcium silicate hydrate, aluminum hydroxide and mixtures thereof.

[0045] When the multi-component composition is kept available in separate components, the chemically bound water and CO2 scavengers, if present, are usually stored together with the organic isocyanate-reactive compound, i.e., in component (A).

[0046] The chemically bound water must exhibit a sufficiently low vapor pressure in its carrier to allow a sufficiently long pot life and sufficiently low foaming of the reaction mixture. It is clear that the source of the chemically bound water must be selected according to the reactivity of the isocyanate compound.

[0047] Catalyst (D) The catalyst is an optional component. As the catalyst, it is possible to use all compounds that accelerate the polyurethane reaction and / or the urea reaction. Such compounds are known in the art. Preferably, the catalyst (D) includes alkaline catalysts such as amine-based catalysts and organometallic compound-based catalysts.

[0048] Examples of amine-based catalysts include bis(2-dimethylaminoethyl)ether, N,N,N,N,N-pentamethyldiethylenetriamine, N,N,N-triethylaminoethoxyethanol, N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine, dimethylcyclohexylamine, dimethylbenzylamine, triethylamine, triethylenediamine, pentamethyldipropylenetriamine, dimethylethanolamine, N-methylimidazole, N-ethylimidazole, tetramethylhexamethylenediamine, tris(dimethylaminopropyl)hexahydrotoluol, and the like. It is possible to use riazine, dimethylaminopropylamine, N-ethylmorpholine, diazabicycloundecene, diazabicyclononene, 2,2'-dimorpholinodiethyl ether, N,N,N'-trimethyl-N'-hydroxyethyl-bisaminoethyl ether, N,N,N'-trimethylaminoethyl-ethanolamine, N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine, N,N-bis(3-dimethylaminopropyl)-N-isopropanolamine and N-(3-dimethylaminopropyl)-N,N-diisopropanolamine or mixtures thereof.

[0049] As catalysts based on organometallic compounds it is possible to use, for example, tin(II) salts of organic carboxylic acids, such as tin(II) acetate, tin(II) octanoate, tin(II) ethylhexanoate and tin(II) laurate, and also organotin compounds such as dialkyltin(IV) salts of organic carboxylic acids, such as dibutyltin diacetate, dibutyltin dilaurate, dibutyltin maleate and dioctyltin diacetate, and also bismuth carboxylates, such as bismuth(III) neodecanoate, bismuth 2-ethylhexanoate and bismuth octanoate, or alkali metal salts of carboxylic acids, such as potassium acetate or potassium formate.

[0050] CO2 Capture Agent (E) The CO2 scavenger is an optional component. If a foamed product is desired, a CO2 scavenger should not be included. On the other hand, if a non-foamed product is desired, it may be advantageous to include a CO2 scavenger in the multi-component composition. Useful CO2 scavenger are known in the art, in particular MgO, CaO, Ca(OH)2 and cements such as Portland cement. CaO and Ca(OH)2 are most preferred. As mentioned above, the CO2 scavenger in a two-component system is usually stored together with the organic isocyanate-reactive compound, i.e., in the (A) component. It was shown below in experiments that ettringite can act as a CO2 scavenger alone.

[0051] As mentioned before, the isocyanate-reactive compound of the present invention may be selected from polyols, in particular polyether polyols, polyester polyols, polycarbonate polyols and mixtures thereof. However, the isocyanate-reactive compound of the present invention may also be selected from polyfunctional amines.

[0052] The isocyanate compound of the present invention may be selected from the group consisting of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), oligomeric MDI, hexamethylene diisocyanate (HDI), trimer HDI, isophorone diisocyanate (IPDI) and mixtures of two or more of these polyisocyanates. The isocyanate compound may also be selected from prepolymers of these isocyanates.

[0053] The source of chemically bound water of the present invention may be selected from ettringite, calcium silicate hydrate, aluminum hydroxide, zeolite and mixtures thereof.

[0054] The catalyst of the present invention may be selected from the group consisting of amine-based catalysts and organometallic compound-based catalysts, in particular dibutyltin dilaurate.

[0055] The CO2 capture agent of the present invention may be selected from CaO and Ca(OH)2 and mixtures thereof.

[0056] The multi-component composition of the present invention may be formulated as one mixture containing all the components and immediately starting to react, however, it is also possible that components (A) and (C), and optionally (D) and (E), are provided in one mixture (component), with the isocyanate compound (B) remaining available separately as another component.

[0057] According to a second aspect, the present invention provides a process for preparing a polyurea polymer by curing a multi-component composition with a source of chemically bound water, comprising mixing (A) an isocyanate-reactive compound, (B) an isocyanate compound selected from the group consisting of polyisocyanates and NCO-terminated prepolymers, (C) a source of chemically bound water, (D) an optional catalyst, and (E) an optional CO2 scavenger, and curing the mixture. Curing produces the polyurea polymer obtainable by this process.

[0058] According to a third aspect, the present invention provides the use of a source of chemically bound water selected from ettringite, calcium silicate hydrate, aluminium hydroxide, zeolite and mixtures thereof in a multi-component composition for hardening said composition, the multi-component composition comprising the following components: (A) an isocyanate-reactive compound; (B) an isocyanate compound selected from the group consisting of polyisocyanates and NCO-terminated prepolymers; (D) optionally a catalyst; (E) optionally a CO2 scavenger; Includes.

[0059] The invention will now be illustrated in more detail by the following examples. EXAMPLES

[0060] General Procedure The materials used are listed in Table 1 below. The components of Part A were mixed. The viscosity and density of these Part A were measured. The isocyanate compound was then added to Part A. The preparation was mixed in a high speed mixer (Hauschild DAC 600.1 FVZ) at 2000 rpm for 1 minute. The resulting freshly prepared reactive mixture was poured onto a polypropylene sheet, dried at 23°C / 50% relative humidity for 7 days, peeled off and measured.

[0061] The viscosity was measured according to DIN EN ISO 3219 with a Modular Compact Rheometer MCR 302 (Anton Paar). The density of the preparations was measured according to DIN EN ISO 2811-1. Shore A / D hardness: DIN 53505. Elongation at break / tensile strength: DIN EN ISO 527-1.

[0062] Example 1 Several multi-component compositions containing polyether diamine (i.e., poly(propylene glycol) bis(2-aminopropyl ether)) as the isocyanate-reactive compound and MDI prepolymer were formulated with various sources of water. In two batches, a CO2 scavenger was present. The individual formulations and their results are listed below in Table 2.

[0063] This was a very reactive system. Although 5% water could not reach sufficient pot life time (bound in zeolite, i.e. batches #4 and #5), chemically bound water such as in ettringite, Al(OH)3 and CSH increased the pot life time up to ≥ 2 hours. Even Ca(OH)2 could not suppress foaming in batch #5. A sufficient amount of ettringite (batch #2) was more successful in suppressing foaming than lime paste combined with ettringite (batch #1).

[0064] Example 2 Several multi-component compositions containing polyester diamine (i.e., poly(1,4-butanediol) bis(4-aminobenzoate)) as the isocyanate-reactive compound and MDI prepolymer were formulated with various sources of water. In two batches, a CO2 scavenger was present. The individual formulations and their results are listed below in Table 3.

[0065] This was a very reactive system. Although 5% water could not reach a sufficient pot-life time (although bound in zeolite, i.e. batches #11 and #12), chemically bound water such as in ettringite, Al(OH)3 and CSH increased the pot-life time to more than 2 hours. Ettringite alone (#10) was more successful than ettringite combined with lime paste (#9) in suppressing foaming.

[0066] Example 3 Example 2 was repeated with carbodiimide modified MDI as the isocyanate component. The individual formulations and the results are listed in Table 4 below.

[0067] The results were essentially the same as in Example 2. The best results were obtained with ettringite as the source of chemically bound water (pot life times up to 5 hours in batch #17 and up to 3 hours in batch #18 - ettringite alone produced less foaming than ettringite combined with lime paste). Zeolite bound water was also suitable in this experiment.

[0068] Example 4 Example 1 was repeated with polytetramethylene glycol (Poly THF) as the isocyanate-reactive compound and trimer HDI as the isocyanate component. The individual formulations and results are listed in Table 5 below.

[0069] This was essentially a polyurethane system with only a few polyurea functionalities. All batches (except for the low A / B mix ratio Al(OH)3-batch #24) gave good pot life times. However, almost all batches gave foaming.

[0070] [Table 1]

[0071] [Table 2]

[0072] [Table 3]

[0073] [Table 4]

[0074] [Table 5]

Claims

1. Ingredients: (A) an isocyanate-reactive compound; (B) an isocyanate compound selected from the group consisting of polyisocyanates and NCO-terminated prepolymers; (C) a source of chemically bound water; (D) optionally a catalyst; (E) optionally CO ２ Scavenger and A multi-component composition comprising:

2. 2. The multi-component composition according to claim 1, wherein the isocyanate-reactive compound (A) is selected from polyols, in particular from polyether polyols, polyester polyols, polycarbonate polyols and mixtures thereof.

3. 3. The multi-component composition according to claim 1 or 2, wherein the isocyanate-reactive compound (A) is selected from polyfunctional amines.

4. 3. The multi-component composition according to claim 1 or 2, wherein the isocyanate compound (B) is selected from the group consisting of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), oligomeric MDI, hexamethylene diisocyanate (HDI), trimer HDI, isophorone diisocyanate (IPDI), and mixtures of two or more of these polyisocyanates.

5. 3. The multi-component composition according to claim 1 or 2, wherein the isocyanate compound (B) is selected from the group consisting of prepolymers of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), oligomeric MDI, hexamethylene diisocyanate (HDI), trimer HDI, isophorone diisocyanate (IPDI), and mixtures of two or more of these polyisocyanate prepolymers.

6. 3. The multi-component composition according to claim 1 or 2, wherein the source of chemically bound water (C) is selected from ettringite, calcium silicate hydrate, aluminum hydroxide, zeolite, and mixtures thereof.

7. 3. The multi-component composition according to claim 1, wherein the catalyst (D) is selected from the group consisting of amine-based catalysts and organometallic compound-based catalysts, in particular dibutyltin dilaurate.

8. The CO ２ The scavenger (E) is CaO and Ca(OH) ２ 3. The multi-component composition according to claim 1, wherein the polyol is selected from the group consisting of hydroxybenzoates, ...

9. 3. The multi-component composition according to claim 1 or 2, wherein components (A) and (C), and optionally (D) and (E), are provided in one component, and the isocyanate compound (B) is kept available separately in another component.

10. 1. A process for preparing a polyurea polymer by curing a multi-component composition with a source of chemically bound water, comprising: (A) an isocyanate-reactive compound; (B) an isocyanate compound selected from the group consisting of polyisocyanates and NCO-terminated prepolymers; (C) a source of chemically bound water; (D) optionally a catalyst; (E) optionally CO ２ Scavenger and and curing said mixture.

11. A polyurea polymer obtainable by the process according to claim 10.

12. 1. Use of a source of chemically bound water selected from ettringite, calcium silicate hydrate, aluminum hydroxide, zeolite and mixtures thereof in a multi-component composition for hardening the composition, said multi-component composition comprising the following components: (A) an isocyanate-reactive compound; (B) an isocyanate compound selected from the group consisting of polyisocyanates and NCO-terminated prepolymers; (D) optionally a catalyst; (E) optionally CO ２ Scavenger and Including, use.

13. 13. The use according to claim 12, wherein the source of chemically bound water is selected from ettringite, calcium silicate hydrate, aluminum hydroxide and mixtures thereof.

Images