Use of reaction resin mixtures with predefined polarity for setting the robustness of a mortar composition and method for setting the robustness of a mortar composition

Abstract

A non-polar reaction resin mixture can be used to improve the adhesion of a mortar composition based on radically polymerizable compounds, in particular based on urethane (meth)acrylates, on the surface of semi-cleaned and/or damp boreholes in mineral substrates. The use of a non-polar reaction resin mixture in the corresponding mortar composition reduced the sensitivity thereof to dampness and inadequate cleaning conditions, so that mortar compositions are obtained overall which are characterized by improved robustness against external influences.

Claims

1. A method. comprising: mixing a non-polar reaction resin mixture into a mortar composition based on radically polvmerizable compounds, wherein the non-polar reaction resin mixture contains a reaction resin, and one or more reactive diluents.

2. The method according to claim 1, wherein the mortar composition based on radically polymerizable compounds is a multi-component reaction resin system.

3. The method according to claim 1, wherein the non-polar reaction resin mixture has a polarity <7 mN/m.

4. The method according to claim 1, wherein the reaction resin comprises at least one compound selected from the group consisting of a compound based on urethane (tneth)acrylate, a compound based on epoxy (meth)acrylate, a compound based on a (tneth)acrylate of an alkoxylated bisphenol, and a compound based on further ethylenically unsaturated compounds.

5. The method according to claim 1, wherein the one or more reactive diluents has little or no dipole moment.

6. The method according to claim 1, wherein the one or more reactive diluents is selected from the group consisting of ethyl methacrylate (EMA), 3,3,5-trimethylcyclohexyl methacrylate (TMCHMA), isobornyl methacrylate (IBOMA), isobutyl methacrylate (i-BMA), tetrahydrofurfuryl methacrylate (THFMA), 2-ethylhexyl methacrylate (2-HEMA), cyclohexyl methacrylate (c-HMA), allyl methacrylate (AMA), benzyl methacrylate (BNMA), isodecyl methacrylate (IDMA), 1,12-dodecanediol dimethacrylate (1,12-DDDDMA), 1,6-hexanediol dimethacrylate (1,6-HDDMA), 1,4-butanediol dimethacrylate (1,4-BDDMA), 1,3-butanediol dimethacrylate (1,3-BDDMA), ethylene glycol dimethacrylate (EGDMA), and glycerol dimethacrylate.

7. A resin component based on radically polymerizable compounds for a multi-component reaction resin system, comprising: at least one non-polar reaction resin mixture containing at least one reaction resin and one or more reactive diluents.

8. A multi-component reaction resin system, comprising: the resin component according to claim 7, and a hardener component arranged separately to inhibit a reaction.

9. A cartridge or film pouch containing the multi-component reaction resin system according to claim 8, which comprises two or more separate chambers in which the resin component and the hardener component are arranged.

10. A method for improving adhesion of a mortar composition based on radically polytnerizable compounds on a surface of a semi-cleaned and/or damp borehole in a mineral substrate, the method comprising: providing a reaction resin, mixing the reaction resin with one or more reactive diluents to produce a non-polar reaction resin mixture, and using the non-polar reaction resin mixture thus produced in a resin component of a multi-component reaction resin system.

11. The method according to claim 2, wherein the multi-component reaction resin system is a two-component reaction resin system.

Description

EXAMPLES

[0096] The resin components non-polar 1 to 5 (according to the invention) and polar 1 to 4 (not according to the invention) were produced by mixing the constituents given in Tables 1 and 2.

TABLE-US-00001 TABLE 1 Constituents of the resin components non-polar 1 to non-polar 5 [in wt. %] Non- Non- Non- Non- Non- Constituent polar 1 polar 2 polar 3 polar 4 polar 5 Reaction Urethane methacrylate 32.64 32.66 32.67 32.65 32.68 resin oligomer (difunctional) Reactive diluent Butanediol-1,4- 9.05 32.67 32.68 32.66 32.69 dimethacrylate (BDDMA) Hydroxypropyl 1.23 1.23 1.23 1.23 1.23 methacrylate (HPMA) 3,3,5-trimethylcyclohexyl 31.42 — — — — methacrylate (TMCHMA) Tricyclodecanediol 23.60 — — — — dimethacrylate (TCDDMA) Allyl methacrylate (AMA) — 31.44 — — — Isobutyl methacrylate (i- — — 31.44 — — BMA) Cyclohexyl methacrylate — — — 31.43 — (c-HMA) Ethyl methacrylate — — — — 31.45 Para-toluidine accelerator 1.70 1.70 1.70 1.70 1.70 TEMPOL inhibitor 0.35 0.30 0.28 0.32 0.25

TABLE-US-00002 TABLE 2 Constituents of the resin components polar 1 to 4 [in wt. %] Constituent Polar 1 Polar 2 Polar 3 Polar 4 Reaction Urethane 32.59 32.60 32.59 32.61 resin methacrylate oligomer (difunctional) Reactive Butanediol-1,4- — — 16.30 9.04 diluent dimethacrylate (BDDMA) Hydroxypropyl 32.60 32.61 1.23 1.23 methacrylate (HPMA) Tetraethoxylated 32.60 — — — bisphenol A dimethacrylate (E4BADMA) Ethylene glycol — 32.61 — 23.58 dimethacrylate (EGDMA) Glycerine — — 16.30 — dimethacrylate (GDMA) Glycerine — — 31.37 31.39 monomethacrylate (GMMA) Para-toluidine 1.70 1.70 1.70 1.70 accelerator TEMPOL inhibitor 0.50 0.47 0.52 0.45

[0097] Determination of Resin Polarity

[0098] As a measure of the polarity of the relevant reaction resin mixture, the polar proportion of the surface tension was taken, which was determined by means of contact angle measurement (drop contour analysis system G10/DSA10 from KRÜSS) on a non-polar reference surface (Teflon). The results of the polarity measurement are shown in Table 3.

[0099] Production of Two-Component Reaction Resin Systems

[0100] The production of two-component reaction resin systems using the reaction resin mixtures listed in Tables 1 and 2 was carried out according to the following procedure: 39.3 g of the resin component, 37.2 g quartz sand F32 (Quarzwerke) and 18.51 g Secar80 (aluminate cement), 0.4 g boric acid (SCL Italia) and 3 g hydrophobic silica (Cabot GmbH) were homogenized in the dissolver under vacuum to form a paste-like compound free of air bubbles.

[0101] The hardener component of the commercially available product HY150 Max from Hilti was used as the hardener component B. The resin components A were each used in a volume ratio of A:B=3:1. The compositions were mixed with one another by a static mixer by means of the Hilti BD 2000 dispenser and applied into a borehole.

[0102] Determination of Load Values

[0103] To determine the load values of the cured compositions, an anchor threaded rod M12 is used, which is dowelled into a borehole in concrete having a diameter of 14 mm and a borehole depth of 110 mm with the two-component reaction resin according to the invention. The average failure load is determined by centrally pulling out the threaded anchor rod with close support using high-strength threaded anchor rods. 5 anchor threaded rods are dowelled in each case and the load values thereof are determined after curing for 24 hours at room temperature (25° C.). The load values were determined on the one hand under reference conditions (dry, cleaned borehole (blowing out with compressed air, brushing with a wire brush (3×), blowing out with compressed air)) and on the other hand in a damp and semi-cleaned borehole (F1b) (blowing out with compressed air, brushing with a wire brush (1×), blowing out with compressed air)). The load values determined in this way are listed in Table 3 below as an average.

TABLE-US-00003 TABLE 3 Results of the measurement of the polarity of the reaction resin mixture and determination of the load values under reference conditions and under F1b conditions Resin component Bond stress Differ- with reaction Polarity Shrinkage [N/mm.sup.2] ence resin mixture [mN/m] [%] Reference F1b [%] Non-polar 1 0.4 1.3 17.5 ± 1.0 16.4 ± 0.8 −6.1 Non-polar 2 4.8 3.6 10.7 ± 0.4 12.6 ± 0.4 17.8 Non-polar 3 6.0 3.3 13.9 ± 0.6 13.2 ± 0.7 −4.9 Non-polar 4 6.7 2.9 16.3 ± 0.5 14.9 ± 0.6 −8.7 Non-polar 5 6.9 3.1 12.4 ± 0.8 11.6 ± 0.9 −6.2 Polar 1 8.7 1.9 19.9 ± 0.8 17.5 ± 0.7 −12.2 Polar 2 9.8 1.5 18.9 ± 0.3 13.3 ± 0.7 −29.5 Polar 3 10.1 2.0 18.2 ± 0.4 14.7 ± 0.5 −19.6 Polar 4 13.3 2.4 16.9 ± 0.7 13.7 ± 0.6 −19.2

[0104] The results in Table 3 show the influence of the polarity of the reaction resin mixture on the robustness of a two-component reaction resin system. The use of a non-polar reaction resin mixture in the corresponding mortar composition reduced the sensitivity thereof to dampness and inadequate cleaning conditions, so that mortar compositions are obtained overall which are characterized by improved robustness against external influences.