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. 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 having a glass transition temperature Tg of −20° C. or above; and V-2) a filler having a Mohs hardness of at least 5.

2. The two-component system according to claim 1, 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.

3. The two-component system according to claim 1, wherein the component A additionally comprises: A-2) a retarder selected from the group consisting of lignosulfonates; cellulose derivatives, hydroxycarboxylic acids, synthetic retarders, inorganic compounds, and mixtures thereof.

4. The two-component system according to claim 1, wherein at least one of the components A and/or B comprises: V-3) a curing accelerator.

5. The two-component system according to claim 4, 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.

6. The two-component system according to claim 1, 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.

7. The two-component system according to claim 1, wherein the hardening activator is an alkalizing agent.

8. 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 1 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.

Description

EXAMPLE 1

(1) 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:

(2) TABLE-US-00001 Suspension of passivated Slurry 2 of US 2014/0343194 having a quick-setting cement: cement content of about 60%; Polymer 1 (Tg = 24° C.): Pure acrylate copolymer, solids content 50% by weight; Polymer 2 (Tg = −43° C.): Pure acrylate copolymer, solids content 70% by weight; Pigment dispersant: Dispex AA 4030, BASF SE; Emulsifier: Lutensol AT 18, BASF SE; Inorganic thickener: Attagel 50; Thickener: Rheovis PU 1270, BASF SE; Filler: Silica sand F36 (Mohs hardness 7); Talc (Mohs hardness 1); Accelerator: Peramin AXL 80, Kerneos, Paris, France; Retarder: Sodium gluconate, BASF SE. The formulations were standardized to the same polymer contents.

(3) TABLE-US-00002 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 3 3 3 3 3 solution (20% strength) Intermediate total B 4.5 4.5 4.5 4.5 4.5 Overall total 100 100 100 100 100 Pull-outforce 1380 N 824 N 324 N 284 N 115 N (24 h) specific 1.50 N/mm.sup.2 0.90 N/mm.sup.2 0.35 N/mm.sup.2 0.31 N/mm.sup.2 0.12 N/mm.sup.2 curing time 60 min 12 h 30 min 90 min 20 min *Comparative experiment

(4) For comparison, the pull-out force of a market product based on epoxide is 2760 N.

(5) 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.