ISOCYANATE-AMINE-BASED CHEMICAL ANCHOR WITH IMPROVED PERFORMANCE, AND USE THEREOF

Abstract

A multi-component resin system can be used for producing a mortar composition based on isocyanate amine adducts for the chemical fastening of construction elements. A mortar composition based on isocyanate amine adducts can be produced from the multi-component resin system. A method can be used for the chemical fastening of construction elements in mineral substrates with the mortar composition based on the isocyanate amine adducts.

Claims

1: A multi-component resin system, containing: an isocyanate component, which comprises at least one aliphatic and/or aromatic polyisocyanate having an average NCO functionality of 2 or more, and an amine component, which comprises at least one amine which is reactive to isocyanate groups and has an average NH functionality of 2 or more, with the proviso that the multi-component resin system is free of polyaspartic acid esters, the isocyanate component and/or the amine component comprises at least one filler and at least one rheology additive, and a total filling level of a mortar composition produced by mixing the isocyanate component and the amine component is in a range from 30 to 80%, wherein the isocyanate component and/or the amine component contains a silane.

2: The multi-component resin system according to claim 1, wherein the silane has at least one Si-bound hydrolyzable group.

3: The multi-component resin system according to claim 2, wherein the silane comprises a further functional group.

4: The multi-component resin system according to claim 3, wherein the silane is selected from the group consisting of a 3-aminopropyltrialkoxysilane, a 3-glycidyloxyalkyltrialkoxysilane, a bis(3-trialkoxysilylpropyl) amine, a 3-mercaptopropyltrialkoxysilane, a 3-(meth)acryloyloxyalkyltrialkoxysilane, an alkenylalkoxysilane, a tetraalkoxysilane, and a mixture of two or more thereof.

5: The multi-component resin system according to claim 1, wherein the silane is contained in an amount of up to 10 wt. %.

6: The multi-component resin system according to claim 1, wherein both the isocyanate component and the amine component comprise at least one filler and the at least one rheological additive.

7: The multi-component resin system according to claim 6, wherein a filling level of the isocyanate component and a filling level of the amine component is from 10 to 70 wt. %, based in each case on a total weight of the isocyanate component and the amine component, respectively.

8: The multi-component resin system according to claim 1, wherein the at least one aliphatic and/or aromatic polyisocyanate and the at least one amine are present in a quantity ratio in which a ratio of the average NCO functionality of the at least one aliphatic and/or aromatic polyisocyanate to the average NH functionality of the at least one amine is between 0.3 and 2.0.

9: The multi-component resin system according to claim 1, wherein the isocyanate component comprises at least one aromatic polyisocyanate selected from the group consisting of 1,4-phenylene diisocyanate, 2,4- and 2,6-toluylene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, tetramethylxylylene diisocyanate, 1,5-naphthylene diisocyanate, diphenylene methane-2,4′- and -4,4′-diisocyanate, triphenylmethane-4,4′,4″-triisocyanate, bis- and tris-(isocyanatoalkyl)-benzene, toluene, and xylene.

10: The multi-component resin system according to claim 1, wherein the isocyanate component comprises at least one aliphatic polyisocyanate selected from the group consisting of hexamethylene diisocyanate (HDI), trimethyl HDI (TMDI), pentane diisocyanate (PDI), 2-methylpentane-1,5-diisocyanate (MPDI), isophorone diisocyanate (IPDI), 1,3- and 1,4-bis(isocyanatomethyl)cyclohexane (H6XDI), bis(isocyanatomethyl)norbornane (NBDI), 3(4)-isocyanatomethyl-1-methyl-cyclohexyl isocyanate (IMCI), and 4,4′-bis(isocyanatocyclohexyl)methane (H12MDI).

11: The multi-component resin system according to claim 1, wherein the total filling level is in a range from 35 to 65 wt. %, based on a total weight of the multi-component resin system.

12: The multi-component resin system according to claim 1, wherein the at least one amine which is reactive to isocyanate groups is selected from the group consisting of 4,4′-methylene-bis[N-(1-methylpropyl)phenylamine], an isomer mixture of 6-methyl-2,4-bis(methylthio)phenylene-1,3-diamine and 2 methyl-4,6-bis(methylthio)phenylene-1,3-diamine, 4,4′-methylenebis(2,6-diethylaniline), 4,4′-methylenebis(N-sec-butylcyclohexanamine), 3,3′-diaminodiphenylsulfone, N,N′-di-sec-butyl-p-phenylenediamine, 2,4,6-trimethyl-m-phenylenediamine, and a mixture thereof.

13: The multi-component resin system according to claim 1, wherein the multi-component resin system is a two-component resin system.

14: A mortar composition, produced by mixing the isocyanate component and the amine component of the multi-component resin system according to claim 1.

15: A method, comprising: chemically fastening a construction element in a borehole, with the mortar composition according to claim 14.

16: A method, comprising: chemically fastening a construction element in a mineral substrate, with the multi-component resin system according to claim 1.

17: A method for improving pull-out strength of a composition in cleaned boreholes, comprising: mixing a silane into a multi-component resin system based on an isocyanate amine adduct for chemical fastening.

18: A method, comprising: chemically fastening a construction element in a borehole, with the multi-component resin system according to claim 1.

19: A method, comprising: chemically fastening a construction element in a mineral substrate, with the mortar composition according to claim 14.

Description

Examples

[0105] The following compounds were used to prepare the comparative composition and the composition according to the invention:

TABLE-US-00001 Hexamethylene-1,6-diisocyanate low-viscosity, aliphatic polyisocyanate Covestro AG homopolymers resin based on hexamethylene diisocyanate (equivalent weight approx. 179; NCO content according to M105-ISO 11909 23.5 ± 0.5 wt. %, monomeric HDI according to M106-ISO 10283 < 0.25%; viscosity (23° C.) M014-ISO 3219/A.3 730 ± 100 mPa .Math. s; Desmodur ™ N 3900) Mixture of 6-methyl-2,4- Ethacure ® 300 Curative Albermale bis(methylthio)phenylene-1,3-diamine and (dimethylthiotoluene diamine 95-97%, Corporation 2-methyl-4,6-bis(methylthio)phenylene-1,3- monomethylthiotoluene diamine 2-3%; diamine equivalent weight with isocyanates 107) 3-glycidyloxypropyltrimethoxysilane Dynasylan ® GLYMO Evonik Resource Efficiency GmbH 3-methacryloxypropyltrimethoxysilane Dynasylan ® MEMO Evonik Resource Efficiency GmbH Vinyltrimethoxysilane Dynasylan ® VTMO Evonik Resource Efficiency GmbH Zeolite powder Purmol ® 3ST (synthetic potassium-type Zeochem AG zeolite having a pore size of 3 Å, a primary crystal size of 4.6 μm and a particle size of 24 μm; residual water (550° C., 2 h) ≤ 1.5% w/w; water adsorption (50% rH, 20° C., 24 h) ≥ 22% w/w) Quartz powder Millisil ™ W12 Quarzwerke Frechen Silica Cab-O-Sil ™ TS- 720 Cabot

[0106] The comparative composition and the compositions according to the invention of the isocyanate component and the amine component are shown in Table 1 below.

TABLE-US-00002 TABLE 1 Compositions of the isocyanate component and the amine component [wt. %] for the comparative example and examples 1 to 4 according to the invention; use of different silanes Comparison 1 2 3 4 Isocyanate Hexamethylene-1,6-diisocyanate 37.5 36 36 36 36 component homopolymer (Desmodur ® N3900) Silane 3-glycidyloxypropyltrimethoxysilane 3 (Dynaslan ® Glymo) 3-trimethoxysilylpropylmethacrtylate 3 (Dynaslan ® Memo) Vinyltrimethoxysilane (Dynaslan ® 3 VTMO) 3-glycidyloxypropyldimethoxysilane 3 Quartz powder (W12) 52 50.5 50.5 50.5 50.5 Silica 1.5 1.5 1.5 1.5 1.5 Zeolite powder 3 3 3 3 3 Aniline (6-methyl-2,4-bis(methylthio)phenylene- 49.5 49.5 49.5 49.5 49.5 component 1,3-diamine/2-methyl-4,6- bis(methylthio)phenylene-1,3-diamine (DMTDA) Quartz powder (W12) 49 49 49 49 49 Silica 1.5 1.5 1.5 1.5 1.5

[0107] To produce the mortar compositions, the isocyanate component and the amine component were each first produced individually. For this purpose, the constituents indicated in Table 1 were combined and homogenized in a dissolver (PC Laborsystem GmbH, 8 min; 3500 rpm) under vacuum (80 mbar) to form an air-bubble-free pasty composition. The isocyanate component and the amine component were then combined with one another and mixed in a speed mixer for 30 seconds at 1500 rpm. The mortar compositions obtained in this way were each filled into a single-component hard cartridge and injected into a borehole using an extrusion device.

[0108] In order to determine the bond stresses (load values) of the cured fastening compositions, anchor threaded rods Hilti HAS-M12 were inserted into hammer-bored boreholes in C20/25 dry concrete having a diameter of 14 mm and a borehole depth of 72 mm. Here, the boreholes were first cleaned twice with compressed air (6 bar), then twice with a cleaning brush and then again twice with compressed air (6 bar). The boreholes cleaned in this way were then filled halfway with the comparative composition and the compositions according to the invention, and the anchor threaded rods were inserted to an embedding depth of 60 mm. The bond stresses were determined by centrally pulling out the anchor threaded rods. In each case, five anchor threaded rods were inserted and, after 24 hours of curing at approximately 21° C., the bond stress was determined. The fastening compositions were ejected out of the cartridges via a static mixer (HIRT-RE-M mixer; Hilti Aktiengesellschaft) and injected into the boreholes.

[0109] The bond stresses obtained using the mortar formulations described above for dry boreholes (premium cleaning) are listed in Table 2 below.

TABLE-US-00003 TABLE 2 Results of the determination of the bond stresses Comparison 1 2 3 4 Bond stress [N/mm.sup.2] 28.8 33.2 32.6 34.3 30.7

[0110] The results show that the compositions according to the invention have a significantly higher performance in well-cleaned, dry boreholes.