TWO-COMPONENT SYSTEM FOR FORMATION OF COHESIVE BONDS OR FOR CHEMICAL ANCHORING

Abstract

A two-component system for forming adhesive bonds or for chemical anchoring comprises a curable binder component A and an activator component B. The component A comprises: A-1) an inhibited hydraulic binder selected from among calcium aluminate cement, calcium sulfoaluminate cement and mixtures thereof; the component B comprises: B-1) a curing activator. At least one of the components A and/or B comprises: V-1) an organic binder; and V-2) a filler having a Mohs hardness of at least 5. The system is an aqueous system which is unproblematical from a health point of view. It is easy to process and quickly attains high strengths.

Claims

1.-11. (canceled)

12. A two-component system for forming adhesive bonds, or for chemical anchoring, comprising a curable binder component A and an activator component B, wherein the component A comprises: A-1) an inhibited hydraulic binder selected from the group consisting of calcium aluminate cement, calcium sulfoaluminate cement, and mixtures thereof; the component B comprises: B-1) a curing activator; and at least one of the components A and/or B comprises: V-1) an organic binder; and V-2) a filler having a Mohs hardness of at least 5.

13. The two-component system according to claim 12, wherein the hydraulic binder is inhibited by means of a setting inhibitor selected from the group consisting of boric acid, oxo acids of phosphorus, and salts thereof.

14. The two-component system according to claim 12, wherein the component A additionally comprises: A-2) a retarder.

15. The two-component system according to claim 14, wherein the retarder is selected from the group consisting of lignosulfonates; cellulose derivatives, hydroxycarboxylic acids, synthetic retarders, inorganic compounds, and mixtures thereof.

16. The two-component system according to claim 12, wherein at least one of the components A and/or B comprises: V-3) a curing accelerator.

17. The two-component system according to claim 16, wherein the curing accelerator is selected from the group consisting of lithium carbonate, lithium sulfate, lithium acetate, lithium silicate, sodium carbonate, sodium sulfate, sodium silicate, sodium aluminate, potassium chloride, potassium silicate, calcium formate, calcium chloride, calcium silicate hydrate, calcium aluminate, aluminum salts, and mixtures thereof.

18. The two-component system according to claim 12, wherein the filler is selected from the group consisting of sand, a-alumina, gravel, ground rock, glass flour, glass spheres, hollow glass spheres, glass fibers, metal fibers, and pyrogenic silicon dioxide.

19. The two-component system according to claim 12, wherein the organic binder has a glass transition temperature Tg of −20° C. or above.

20. The two-component system according to claim 12, wherein the hardening activator is an alkalizing agent.

21. A process for forming adhesive bonds or for chemical anchoring, wherein a) component A and component B of a two-component system according to claim 12 are mixed, b) the mixture is introduced into a recess of a substrate or an intermediate space between substrates and c) an anchoring element or reinforcing element is optionally introduced into the recess or the intermediate space.

22. An apparatus for mixing and dispensing the two-component system according to claim 12, comprising a first chamber comprising the component A, a second chamber comprising the component B, a mixing chamber which comprises at least one first inlet opening which is connected to the first chamber, at least one second inlet opening which is connected to the second chamber and at least one outlet opening for exit of the material from the mixing chamber and an actuator for conveying the first and second components into the mixing chamber.

Description

EXAMPLE 1

[0121] Masonry injection mortars having the composition indicated in Table 1 were produced; the % by weight indicated are based on the total weight of the two-component system. The following starting materials were used: [0122] Suspension of passivated quick-setting cement: Slurry 2 of US 2014/0343194 having a cement content of about 60%; [0123] Polymer 1 (Tg=24° C.): Pure acrylate copolymer, solids content 50% by weight; [0124] Polymer 2 (Tg=−43° C.): Pure acrylate copolymer, solids content 70% by weight; [0125] The formulations were standardized to the same polymer contents. [0126] Pigment dispersant: Dispex AA 4030, BASF SE; [0127] Emulsifier: Lutensol AT 18, BASF SE; [0128] Inorganic thickener: Attagel 50; [0129] Thickener: Rheovis PU 1270, BASF SE; [0130] Filler: Silica sand F36 (Mohs hardness 7); Talc (Mohs hardness 1); [0131] Accelerator: Peramin AXL 80, Kerneos, Paris, France; [0132] Retarder: Sodium gluconate, BASF SE.

TABLE-US-00001 TABLE 1 Starting materials Experiment 1 Experiment 2* Experiment 3* Experiment 4 Experiment 5* Cement (hardener) 25 0 25 25 25 Polymer 1 (hard) 36 36 — — 36 Polymer 2 (soft) — — — 26 — Water 0 25 36 10 0 Lutensol AT 18 (20%) 0.5 0.5 0.5 0.5 0.5 Dispex AA 4030 0.3 0.3 0.3 0.3 0.3 Sodium gluconate 0.2 0.2 0.2 0.2 0.2 Silica sand F36 15 15 15 15 — Hollow glass spheres 15 15 15 15 — Talc — — — — 30 Attagel 50 (A) 1 1 1 1 1 Peramin AXL80 2 2 2 2 2 Rheovis PU 1270 0.5 0.5 0.5 0.5 0.5 Intermediate total A 95.5 95.5 95.5 95.5 95.5 Water 0.5 0.5 0.5 0.5 0.5 Attagel 50 (B) 0.5 0.5 0.5 0.5 0.5 Peramin AXL80 0.5 0.5 0.5 0.5 0.5 Sodium hydroxide solution 3 3 3 3 3 (20% strength) Intermediate total B 4.5 4.5 4.5 4.5 4.5 Overall total 100 100 100 100 100 Pull-out force 1380N 824N 324N 284N 115N (24 h) 1.50 0.90 0.35 0.31 0.12 specific N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 curing time 60 min 12 h 30 min 90 min 20 min *Comparative experiment

[0133] For comparison, the pull-out force of a market product based on epoxide is 2760 N.

[0134] The examples show that the system according to the invention can quickly build up high strengths. Concomitant use of a filler having an insufficient Mohs hardness (experiment 5) leads to a worsened pull-out force. A composition without cement (experiment 2) cures slowly. Concomitant use of an organic binder having a high Tg (Tg above −20° C.; experiment 1 vs. experiment 4) is advantageous for a high pull-out force. The system according to the invention is an aqueous system which is unproblematical from a health point of view.