RAPID-CURING TWO-COMPONENT SILICONE COMPOSITION HAVING A LONGER MIXER OPEN TIME
20230357510 · 2023-11-09
Assignee
Inventors
Cpc classification
C08L83/00
CHEMISTRY; METALLURGY
C08L83/00
CHEMISTRY; METALLURGY
C08G2190/00
CHEMISTRY; METALLURGY
International classification
Abstract
A two-component silicone composition including a component (A) including at least one hydroxyl-terminated polydiorganosiloxane (P); preferably at least one filler; between 0.05% and 5.0% by weight of emulsified water, based on component (A); and a component (B) including at least one noncondensable polydiorganosiloxane (W) as a plasticizer; at least one organosilane (V) as a crosslinker; at least one catalyst (K) for the crosslinking of polydiorganosiloxanes; wherein all organosilanes (V) preferably have the same hydrolyzable alkoxysilane groups, preferably methoxysilane groups; and catalyst (K) is a tin complex having two mercaptide ligands of formula (V), where ligands (L.sup.1) are each independently alkyl mercaptides coordinated via sulfur, especially C.sub.6 to C.sub.16 alkyl mercaptides, where ligands (L.sup.1) optionally have methyldialkoxysilane groups, preferably methyldimethoxysilane groups, and ligands (L.sup.2) are each independently alkyl ligands, especially C.sub.6 to C.sub.14 alkyl ligands; and component (B) contains less than 5% by weight of carbon black based on component (B).
Claims
1. A two-component silicone composition consisting of a component A comprising i) at least one hydroxyl-terminated polydiorganosiloxane P; ii) optionally at least one filler; iii) between 0.05% and 5.0% by weight of emulsified water, based on component A; and a component B comprising i) at least one noncondensable polydiorganosiloxane W as plasticizer; ii) at least one organosilane V as crosslinker; iii) at least one catalyst K for the crosslinking of polydiorganosiloxanes; wherein catalyst K is a tin complex of formula (V) that has two mercaptide ligands, ##STR00011## where ligands L.sup.1 are each independently alkyl mercaptides coordinated via sulfur, where ligands L.sup.1 optionally have methyldialkoxysilane groups, and ligands L.sup.2 are each independently alkyl ligands; and component B contains less than 5% by weight of carbon black, based on component B.
2. The two-component silicone composition as claimed in claim 1, wherein the hydroxyl-terminated polydiorganosiloxane P is a polydiorganosiloxane P′ of the formula (I) ##STR00012## where the radicals R.sup.1 and R.sup.2 are each independently linear or branched, monovalent hydrocarbyl radicals that have 1 to 12 carbon atoms and optionally include one or more heteroatoms, and optionally one or more C—C multiple bonds and/or optionally cycloaliphatic and/or aromatic components; and n is chosen such that the weight-average molecular weight M.sub.w of the polydiorganosiloxane P′ relative to polystyrene is 500 to 250000 g/mol.
3. The two-component silicone composition as claimed in claim 2, wherein the hydroxyl-terminated polydiorganosiloxane P′ is a polydiorganosiloxane P1 of the formula (I), where n is chosen such that the weight-average molecular weight M.sub.w of the polydiorganosiloxane P1 relative to polystyrene is 30000 to 80000 g/mol; or in that the polydiorganosiloxane P′ used is a mixture of i′) at least one hydroxyl-terminated polydiorganosiloxane P2 of the formula (I), where n is chosen such that the weight-average molecular weight M.sub.w of the polydiorganosiloxane P2 relative to polystyrene is >80000 to 250000 g/mol; and ii′) at least one hydroxyl-terminated polydiorganosiloxane P3 of the formula (I), where n is chosen such that the weight-average molecular weight M.sub.w of the polydiorganosiloxane P3 relative to polystyrene is 500 to ≤30000 g/mol; or in that the polydiorganosiloxane P′ used is a mixture of i″) at least one hydroxyl-terminated polydiorganosiloxane P1 of the formula (I), where n is chosen such that the weight-average molecular weight M.sub.w of the polydiorganosiloxane P1 relative to polystyrene is 30000 to 80000 g/mol; and ii″) at least one hydroxyl-terminated polydiorganosiloxane P3 of the formula (I), where n is chosen such that the weight-average molecular weight M.sub.w of the polydiorganosiloxane P3 relative to polystyrene is 500 to ≤30000 g/mol.
4. The two-component silicone composition as claimed in claim 2, wherein the radicals R.sup.1 and R.sup.2 are alkyl radicals having 1 to 5 carbon atoms.
5. The two-component silicone composition as claimed in claim 1, wherein organosilane V contains between 0% and 50% by weight, based on component B, of at least one first organosilane V1 of formula (I); and ##STR00013## Contains between 2% and 60% by weight, based on component B, of at least one second organosilane V2 of formula (II); ##STR00014## and contains up to 25% by weight, based on component B, of further organosilanes V3 having hydrolyzable alkoxysilane groups Si—OR.sup.a that are not covered by the formulas (I) and (II); where R.sup.a is a hydrogen atom or an ethyl group or a methyl group; R.sup.b is a divalent linear or branched alkyl radical or alkenyl radical having 2 to 20 carbon atoms, and R.sup.c is a divalent linear or branched alkyl radical that has 2 to 20 carbon atoms and contains at least one secondary amino group; with the proviso that the composition contains less than 10 mol %, based on the amount of organosilane V2, of organosilanes having epoxy groups.
6. The two-component silicone composition as claimed in claim 5, wherein organosilane V3 comprises at least one silane of the formula (III), ##STR00015## where the radical R.sup.3 is each independently a linear or branched, monovalent hydrocarbyl radical that has 1 to 12 carbon atoms and optionally includes one or more heteroatoms, and optionally one or more C—C multiple bonds and/or optionally cycloaliphatic and/or aromatic components; the radical R.sup.4 is a radical R.sup.a; and p has a value of 0 to 4, with the proviso that, if p has a value of 3 or 4, at least p-2 radicals R.sup.3 each have at least one group reactive with the hydroxyl groups of the polydiorganosiloxane P.
7. The two-component silicone composition as claimed in claim 5, wherein the organosilane V2 comprises at least one organosilane of formula (IIa), ##STR00016## where R.sup.d is a divalent linear or branched alkyl radical that has 2 to 10 carbon atoms and optionally contains a hydroxyl group and an ether oxygen, and R.sup.e is a divalent linear or branched alkyl radical that has 2 to 10 carbon atoms and optionally contains a secondary amino group.
8. The two-component silicone composition as claimed in claim 7, wherein the organosilane V2 is either an organosilane V2a in which the radicals R.sup.d and R.sup.e in formula (IIa) are both a divalent linear or branched alkyl radical having 2 to 10 carbon atoms; or an organosilane V2b in which radical R.sup.e in formula (IIa) is a divalent linear or branched alkyl radical having 2 to 10 carbon atoms that optionally contains a secondary amino group, and radical R.sup.d contains a divalent linear or branched alkyl radical having 2 to 10 carbon atoms, additionally contains one of the two structural elements shown in formula (IIb); ##STR00017## or are a mixture of an organosilane V2a and an organosilane V2b, where the organosilanes V2a and V2b mentioned are present in component B in a weight ratio of between 1:2 and 2:1.
9. The two-component silicone composition as claimed in claim 8, wherein organosilane V2 comprises an organosilane V2a, organosilane V2a being present in an amount of between 5% and 20% by weight based on component B, and organosilane V2 comprises an organosilane V2b, organosilane V2b being present in an amount of between 5% and 20% by weight based on component B, and in that at least one organosilane V3 is present in an amount of between 2.5% and 20% by weight based on component B, and in that the catalyst K is present in component B in an amount of between 0.1% and 1.5% by weight based on component B.
10. The two-component silicone composition as claimed in claim 7, wherein organosilane V2b is a radical R.sup.e a divalent C.sub.5 alkyl radical that has a secondary amino group in the carbon chain and radical R.sup.d is a linear divalent C.sub.6 alkyl radical that has an ether oxygen in the carbon chain and also has a hydroxyl group.
11. The two-component silicone composition as claimed in claim 1, wherein, in the catalyst K of the formula (V), both ligands L.sup.1 are dodecyl mercaptide and both ligands L.sup.2 are octyl.
12. The two-component silicone composition as claimed in claim 1, wherein the weight ratio of component A to component B is ≥1:1.
13. An adhesive, sealant, coating or casting compound comprising the two-component silicone composition as claimed in claim 1.
14. The adhesive, sealant, coating or casting compound as claimed in claim 13, configured for use in window construction or facade construction.
15. A cured silicone composition, wherein it is obtainable from a two-component silicone composition as claimed in claim 1 by mixing component A with component B.
Description
EXAMPLES
[0201] Working examples are presented hereinbelow, which are intended to further elucidate the described invention. The invention is of course not limited to these described working examples.
Preparation of the Silicone Compositions
[0202] The following compositions were produced:
[0203] As components A and B, the constituents listed in Tables 2 to 5 were mixed together in the specified percentages by weight in a dissolver at room temperature under an inert atmosphere, and stirred in until a macroscopically homogeneous paste was obtained.
[0204] The prepared components A and B were sealed in separate containers in an airtight manner. Upon application, components A and B were mixed in the required weight ratio using a speed mixer (Hauschild & Co. KG, Germany).
Description of the Test Methods
[0205] To measure the pot life (also open time) of the composition, components A and B were mixed together by means of a tumbling mixer in a weight ratio as specified in Tables 6 to 9 (A:B=13:1 or A:B=3:1), after first being conditioned at 23° C. in a closed cartridge for 24 hours. A wooden spatula was then introduced into the mass. The spatula was used to determine at one-minute intervals whether the mixed mass is still pasty in character. As soon as the mass shows partially elastic behavior, the pot life is considered to have been attained. Measurements with artificially aged compositions were also carried out. Before undergoing the test program mentioned above, these were first heated at 70° C. for 7 days in closed containers, the respective components A and components B being heated separately from each other in a closed manner.
[0206] The method for determining the elongation at break and the tensile strength and the production of the test specimens required for this purpose are described in ISO 527.
[0207] Measurements were carried out at 23° C. and 50% relative humidity on a type 1B test specimen (ISO 527-2) and with a strain rate of 200 mm/min.
Preparation of Crosslinker V2b
[0208] N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane (Geniosil® GF 91, Wacker) was mixed with an equimolar amount of 3-glycidoxypropyltrimethoxysilane (Geniosil® GF 80, Wacker) in a glass vessel under a nitrogen atmosphere. The vessel was closed and left at 23° C. for 7 days. The resulting mixture, which was free of detectable epoxy groups, was used as organosilane V2b without workup.
Origin or Preparation of Catalysts K1 to K8
[0209] K1: Fomrez® UL-32 (Galata Chemicals) [0210] K2: TIB KAT® 318 (TIB Chemicals) [0211] K3: Fomrez® UL-22 (Galata Chemicals) [0212] K4: Fomrez® UL-21 (Galata Chemicals) [0213] K5: 0.012 mol of dioctyltin diacetate (TIB KAT® 229, TIB Chemicals) was stirred with 0.025 mol of 3-mercaptopropylmethyldimethoxysilane (Gelest) in a sealed glass vessel under a nitrogen atmosphere at 23° C. for 24 h. [0214] K6: 0.012 mol of dioctyltin diacetate (TIB KAT® 229, TIB Chemicals) was stirred with 0.025 mol of 3-mercaptopropyltrimethoxysilane (Gelest) in a sealed glass vessel under a nitrogen atmosphere at 23° C. for 24 h. [0215] K7: 0.012 mol of dioctyltin diacetate (TIB KAT® 229, TIB Chemicals) was stirred with 0.025 mol of octadecyl mercaptan (Aldrich) in a sealed glass vessel under a nitrogen atmosphere at 23° C. for 24 h. [0216] K8: 0.012 mol of butyltin triacetate (TIB KAT® 220, TIB Chemicals) was stirred with 0.037 mol of dodecyl mercaptan (Aldrich) in a sealed glass vessel under a nitrogen atmosphere at 23° C. for 24 h.
TABLE-US-00001 TABLE 1 Catalyst L.sup.1 L.sup.1 L.sup.2 L.sup.2 K1 1-Dodecanethiolate 1-Dodecanethiolate Octyl Octyl K2 Neodecanoate Neodecanoate Octyl Octyl K3 1-Dodecanethiolate 1-Dodecanethiolate Methyl Methyl K4 ª
TABLE-US-00002 TABLE 2 Two-component silicone compositions 1 to 8. 2 3 4 6 8 Composition 1 Ref Ref Ref 5 Ref 7 Ref A OH-term. PDMS .sup.a 36.7 36.7 36.7 36.7 36.7 36.7 36.7 36.7 (viscosity (23° C.) 20 000 mPa .Math. s) (polymer P1) OH-term. PDMS .sup.a 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 (viscosity (25° C.) 34.5 mPa .Math. s) (polymer P3) Plasticizer W 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 (Wacker ® AK 100) .sup.b Polypropylene glycol 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 dispersion additive Silicone oil in water 0.46 0.46 0.46 0.46 0.46 0.46 0.46 0.46 emulsion (60% H.sub.2O) Hakuenka ® CCR-S 40.4 40.4 40.4 40.4 40.4 40.4 40.4 40.4 (hydrophobized precipitated chalk) Calciplast ® 4M 9.14 9.14 9.14 9.14 9.14 9.14 9.14 9.14 (hydrophobized ground chalk) B Plasticizer W 67.5 67.5 67.5 67.5 67.5 67.5 67.5 67.5 (Wacker ® AK 20 000) .sup.c Dynasylan ® 1124 5.26 5.26 5.26 5.26 5.26 5.26 5.26 5.26 (crosslinker V2a) Crosslinker V2b 19.53 19.53 19.53 19.53 19.53 19.53 19.53 19.53 (see method of preparation) Wacker ® Silane M1 2.63 2.63 2.63 2.63 2.63 2.63 2.63 2.63 Trimethoxy (methyl- trimethoxysilane) (crosslinker V3) Aerosil ® R972 4.25 4.25 4.25 4.25 4.25 4.25 4.25 4.25 (hydrophobic fumed silica) Catalyst K .sup.d K1 K2 K3 K4 K5 K6 K7 K8 All values in % by weight based on the respective component A or B; .sup.a OH-term. PDMS: OH-terminated polydimethylsiloxane; .sup.b Wacker Polymer AK 100: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 100 mPa .Math. s; .sup.c Wacker silicone oil AK 20 000: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 20 000 mPa .Math. s; .sup.d In each case 0.82% by weight of catalyst K, based on component B, was used.
TABLE-US-00003 TABLE 3 Two-component silicone compositions 9 to 16. Composition 9 10 11 12 13 14 15 16 A OH-term. PDMS .sup.a 36.7 36.7 36.7 36.7 36.7 36.7 36.7 36.7 (viscosity (23° C.) 20 000 mPa .Math. s) (polymer P1) OH-term. PDMS .sup.a 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 (viscosity (25° C.) 34.5 mPa .Math. s) (polymer P3) Plasticizer W 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.0 (Wacker ® AK 100) .sup.b Polypropylene glycol 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 dispersion additive Silicone oil in water 0.46 0.46 0.46 0.46 0.46 0.46 0.46 0.46 emulsion (60% H.sub.2O) Hakuenka ® CCR-S 40.4 40.4 40.4 40.4 40.4 40.4 40.4 40.4 (hydrophobized precipitated chalk) Calciplast ® 4M 9.14 9.14 9.14 9.14 9.14 9.14 9.14 9.14 (hydrophobized ground chalk) B Plasticizer W 67.5 67.5 67.5 67.5 67.5 67.5 67.5 67.5 (Wacker ® AK 20 000) .sup.c Dynasylan ® 1124 16.9 12.4 7.9 5.3 5.26 5.26 5.26 5.26 (crosslinker V2a) Crosslinker V2b 7.9 12.4 16.9 19.5 16.9 14.3 6.37 0 (see method of preparation) Wacker ® Silane 2.63 2.63 2.63 2.63 5.27 7.87 15.8 22.17 M1 Trimethoxy (methyl- trimethoxysilane) (crosslinker V3) Aerosil ® R972 4.25 4.25 4.25 4.25 4.25 4.25 4.25 4.25 (hydrophobic fumed silica) Catalyst K1 .sup.d 0.82 0.82 0.82 0.82 0.82 0.82 0.82 0.82 All values in % by weight based on the respective component A or B; .sup.a OH-term. PDMS: OH-terminated polydimethylsiloxane; .sup.b Wacker Polymer AK 100: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 100 000 mPa .Math. s; .sup.c Wacker silicone oil AK 20 000: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 20 000 mPa .Math. s; .sup.d Bis(dodecylthio)dioctylstannane.
TABLE-US-00004 TABLE 4 Two-component silicone compositions 17 to 24. Composition 17 18 19 20 21 22 23 24 A OH-term. PDMS .sup.a 36.7 36.7 36.7 36.7 36.7 36.7 36.7 36.7 (viscosity (23° C.) 20 000 mPa .Math. s) (polymer P1) OH-term. PDMS .sup.a 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 (viscosity (25° C.) 34.5 mPa .Math. s) (polymer P3) Plasticizer W 11.0 11.0 11.0 11.0 11.0 11.0 11.0 11.28 (Wacker ® AK 100) .sup.b Polypropylene glycol 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 dispersion additive Silicone oil in water 0.46 0.46 0.46 0.46 0.46 0.46 0.46 0.18 emulsion (60% H.sub.2O) Hakuenka ® CCR-S 40.4 40.4 40.4 40.4 40.4 40.4 40.4 40.4 (hydrophobized precipitated chalk) Calciplast ® 4M 9.14 9.14 9.14 9.14 9.14 9.14 9.14 9.14 (hydrophobized ground chalk) B Plasticizer W 67.5 67.5 67.5 67.5 67.5 67.5 67.5 67.5 (Wacker ® AK 20 000) .sup.c Dynasylan ® 1124 5.3 5.26 5.26 5.26 5.15 5.27 5.26 5.26 (crosslinker V2a) Crosslinker V2b (see 19.5 16.9 16.9 16.9 16.3 17.3 16.9 16.9 method of preparation) Methyltrimethoxysilane 0 4.9 1.74 0.87 5.16 5.27 0 5.26 (crosslinker V3) Octyltrimethoxysilane 2.62 0.36 3.52 4.39 0 0 0 0 (crosslinker V3) Phenyltrimethoxysilane 0 0 0 0 0 0 5.26 0 (crosslinker V3) Aerosil ® R972 4.26 4.26 4.26 4.26 4.26 4.26 4.26 4.26 (hydrophobically fumed silica) Catalyst K1 .sup.d 0.82 0.82 0.82 0.82 1.63 0.40 0.82 0.82 All values in % by weight based on the respective component A or B; .sup.a OH-term. PDMS: OH-terminated polydimethylsiloxane; .sup.b Wacker Polymer AK 100: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 100 mPa .Math. s; .sup.c Wacker silicone oil AK 20 000: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 20 000 mPa .Math. s; .sup.d Bis(dodecylthio)dioctylstannane.
TABLE-US-00005 TABLE 5 Two-component silicone compositions 25 and 26. Composition 25 26 A OH-term. PDMS .sup.a (viscosity (23° C.) 34.2 34.2 20 000 mPa .Math. s) (polymer P1) Plasticizer W (Wacker ® AK 100) .sup.b 8.5 8.5 Polypropylene glycol dispersion additive 1.1 1.1 Silicone oil in water emulsion (60% H.sub.2O) 0.40 0.40 Hakuenka ® CCR-S (hydrophobized 19.7 19.7 precipitated chalk) Calciplast ® 4M (hydrophobized ground chalk) 35.5 35.5 B Plasticizer W (Wacker ® AK 20 000) .sup.c 64.19 64.01 Methyltrimethoxysilane (crosslinker V3) 11.7 11.64 Crosslinker V2b (see method of preparation) 15.12 15.08 Dynasylan ® 1189 (N-(n-butyl)-3- 0 3.33 aminopropyltrimethoxysilane) (crosslinker V3) Silauest ® A-Link 15 (N-ethyl-3- 3.33 0 trimethoxysilyl-2-methylpropanamine) (crosslinker V3) Aerosil ® R972 (hydrophobically fumed silica) 5.3 5.3 Catalyst K1 .sup.a 0.82 0.82 All values in % by weight based on the respective component A or B; .sup.a OH-term. PDMS: OH-terminated polydimethylsiloxane; .sup.b Wacker Polymer AK 100: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 100 mPa .Math. s; .sup.c Wacker silicone oil AK 20 000: Trialkylsilane-terminated polydimethylsiloxane having a viscosity according to DIN 53018 of 20 000 mPa .Math. s; .sup.d Bis(dodecylthio)dioctylstannane
TABLE-US-00006 TABLE 6 Test data for compositions 1 to 6 and 25 to 26. 2 3 4 6 Composition 1 Ref. Ref. Ref. 5 Ref. 25 26 Pot life 13:1 26 3 6 >180 31 17 25 30 (w/w) [min] Pot life 3:1 11 <1 7 n/a 16 13 22 21 (w/w) [min] Pot life (a)* 13:1 28 n/m 5 n/m 40 30 n/m n/m (w/w) [min] Pot life (a)* 3:1 11.3 n/m 2.5 n/m 19 5.8 n/m n/m (w/w) [min] (a)*: Components A and B of these samples were aged beforehand in an oven at 70° C. for 7 d. n/m: Data were not measured. n/a: Not cured.
TABLE-US-00007 TABLE 7 Test data for compositions 7 to 12. 8 Composition 7 Ref. 9 10 11 12 Pot life 13:1 (w/w) [min] 22 >270 7 11 35 36 Pot life 3:1 (w/w) [min] 7.6 >270 4.25 7 17.5 11 Pot life (a)* 13:1 (w/w) 19 n/m 7 12 n/m n/m [min] Pot life (a)* 3:1 (w/w) 4.3 n/m 4.25 7.3 n/m n/m [min] Tensile strength 5 h [MPa] n/m n/m 1.66 1.59 1.12 1.2 Tensile strength 24 h [MPa] n/m n/m 1.65 1.68 1.47 1.43 Tensile strength 7 d [MPa] n/m n/m 1.59 1.7 1.67 1.29 Tensile strength (a)* 7 d n/m n/m 1.52 1.58 n/m n/m [MPa] (a)*: Components A and B of these samples were aged beforehand in an oven at 70° C. for 7 d. n/m: Data were not measured.
TABLE-US-00008 TABLE 8 Test data for compositions 13 to 18. Composition 13 14 15 16 17 18 Pot life 13:1 (w/w) [min] 31 30 20 15.5 50 30 Pot life 3:1 (w/w) [min] 10 9.9 6 4 13.5 10 Pot life (a)* 13:1 (w/w) 38 n/m n/m n/m n/m 34 [min] Pot life (a)* 3:1 (w/w) 12 n/m n/m n/m n/m 12 [min] Tensile strength 5 h [MPa] 1.61 1.76 1.38 1.45 0.6 n/m Tensile strength 24 h [MPa] 1.69 1.66 1.55 1.51 1.53 n/m Tensile strength 7 d [MPa] 1.69 1.77 1.72 1.48 1.69 1.81 Tensile strength (a)* 7 d 1.7 1.64 n/m n/m 1.64 1.78 [MPa] (a)*: Components A and B of these samples were aged beforehand in an oven at 70° C. for 7 d. n/m: Data were not measured.
TABLE-US-00009 TABLE 9 Test data for compositions 19 to 24. Composition 19 20 21 22 23 24 Pot life 13:1 (w/w) [min] 52 50 16 40 12.5 31 Pot life 3:1 (w/w) [min] 9.5 10 10.3 9 6 9.75 Pot life (a)* 13:1 (w/w) 51 51 21 n/m 15 n/m [min] Pot life (a)* 3:1 (w/w) 10 10.5 8.75 n/m 6.3 n/m [min] Tensile strength 5 h [MPa] 0.76 0.5 1.73 0.85 1.64 1.64 Tensile strength 24 h [MPa] 1.54 1.69 1.84 1.56 1.58 1.65 Tensile strength 7 d [MPa] 1.68 1.87 1.73 1.65 1.51 1.68 Tensile strength (a)* 7 d 1.57 1.68 1.79 n/m 1.5 n/m [MPa] (a)*: Components A and B of these samples were aged beforehand in an oven at 70° C. for 7 d. n/m: Data were not measured.