Reinforced surface treatment compound

Abstract

A compound for reinforcing surface treatment, particularly a compound for waterproofing and reinforcing surface treatment of concrete containing water glass, containing 1 to 10% by weight of bis(γ-triethoxysilylpropylsilylpropyl)tetrasulfide, 89.9 to 98% by weight of an aqueous lithium silicate solution, and 0.1 to 1% by weight of a water glass stabilizer.

Description

[Technical field]

[0001] The present invention relates to a compound for reinforcing surfaces, in particular to a compound for waterproofing concrete surfaces containing water glass. [Background technology]

[0002] From existing technology, it is known that concrete is a composite material composed of binders, fillers, water, and mixtures. The most common type of concrete is cement concrete, where the binder is cement and the filler is aggregate. Furthermore, the most used type of cement is asphalt concrete. The properties and uses of cement are influenced by the type of filler as well as the binder, for example for heat-resistant cements, cements with a high amount of aluminates are used.

[0003] To improve its mechanical properties, iron reinforcement, cables, wires, various fibers, such as carbon or glass, are added to concrete. Also, lightweight concrete is produced with a porous structure, and the admixture is fly ash from coal combustion.

[0004] The main problem for the durability of concrete structures is the ongoing alkali-silica reaction. This is a series of undesirable events between the concrete solution containing alkaline sodium and potassium oxides, hydroxide ions from calcium hydroxide and silica (which form both natural and artificial aggregates for concrete). Silica dissolves and decomposes under the influence of hydrophilic hydroxide ions and metal cations from the cement present, and then forms hygroscopic porous gels from polymetal silicates, mCaO.nSiO2.pH2O, mCaO.nAl2O3.pH2O, mCaO.nFe2O3.pH2O, etc., which can adsorb water and swell in a humid environment. This causes stresses in the concrete, leading to the formation of a lightweight coating of alkali-silicate gel on the surface of the concrete, cracking, surface spalling, spalling, and overall collapse.

[0005] To extend the durability of concrete and reduce corrosion, many methods are used. For example, concrete reinforcement agents can be used that prevent moisture from penetrating into the concrete and causing a chemical reaction between the alkali in the concrete, the silica in the aggregate, and the water based on water glass. Some people use ordinary sodium or potassium water glass. However, they are completely unsuitable, because the extremely opposite sodium and potassium cations participate in and promote the formation of hygroscopic gels. In addition, sodium and potassium cations are large and cannot penetrate the sealing surface uniformly. This imbalance of gel formation and internal pressure intensifies the entire decomposition process. Sodium and potassium hardeners have a very high solubility in water and absorb it, as a result of which the alkali-silica reaction is again promoted.

[0006] Other concrete preservatives used include alkoxysilanes. These are transparent hydrophobic preparations that prevent the penetration of water and chlorides into the concrete. This eliminates corrosion of the concrete. Examples are methyltrimethoxysilane, propyltrimethoxysilane, dodecyltrimethoxysilane, and similar compounds derived from ethoxysilane, etc.

[0007] From the Russian patent document RU 2544854, a thermal insulation coating for plaster and concrete is known, which contains a styrene acrylate dispersion, diethylene glycol and volatile oil, the compound being highly flammable, toxic and environmentally unfriendly. The disadvantage is that the coating is not waterproof and therefore cannot be used on external walls etc. It forms a thin film on the concrete surface and does not act to a certain depth.

[0008] From the further Chinese patent document CN109321074, a waterproof coating for building materials is known, which contains a small amount of water glass and whose main component is toxic acrylonitrile. The disadvantages of this coating are that it is organic in nature, thermally unstable and not environmentally friendly. It forms a thin film on the concrete surface and does not work to a certain depth.

[0009] An epoxy coating for the treatment of concrete against water is known from Korean patent document KR 101783331. This coating acts only as a surface film which does not strengthen the concrete in the depth direction and does not prevent the alkali-silica reaction.

[0010] A known coating for concrete based on sodium and potassium glass is known from Czech patent application CZ PV 1991-2211. As mentioned above, sodium and potassium glass is not suitable for concrete coating, since the sodium and potassium atoms are large and cannot penetrate the concrete structure and do not interfere with destructive processes.

[0011] A compound of potassium silicate and lithium silicate is known from the further Korean patent document KR 100820276. A disadvantage of this compound is the presence of toxic boric acid.

[0012] From Korean patent document KR 100982229, a compound containing sodium silicate and potassium silicate is known. This compound further contains up to 10% by weight of a lithium compound. This coating is not very effective.

[0013] From the Czech patent application CZ PV 1996-3066 a coating for concrete roofs, or possibly metal and glass, is known, which contains a significantly significant amount of silicon oxide, as well as sodium, lithium, potassium and other oxides, mainly aluminum and pigments. As fillers, layered silicates, mica are used, slag, sand, etc. can be added. The disadvantage of this coating is that it acts only on the surface of the treated material.

[0014] From the Czech patent application CZ PV 2000-2127 a compound for the formation of a waterproofing film for cement systems, wood and tiles is known. It is a compound of lime, sucrose or glycerol and sodium metasilicate in water. The disadvantage is the short life of the protective layer formed in this way. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Russian Patent No. RU2544854 [Patent Document 2] Chinese Patent No. CN109321074 [Patent Document 3] Korean Patent No. KR101783331 [Patent Document 4] Czech Republic Patent Application No. CZ PV 1991-2211 [Patent Document 5] Korean Patent No. KR 100820276 [Patent Document 6] Korean Patent No. KR 100982229 [Patent Document 7] Czech Republic Patent Application No. CZ PV 1996-3066 [Patent Document 8] Czech Republic Patent Application No. CZ PV 2000-2127 Summary of the Invention [Problem to be solved by the invention]

[0016] From the above current state of the art, it is clear that the main drawback of the known current state of the art is that the known means for treating the surface of concrete do not protect the concrete, but on the contrary often cause its destruction. Another drawback is that the known compositions have a relatively short service life.

[0017] It is an object of the present invention to provide a concrete treating compound which acts not only on the surface but also in the interior of concrete structures while significantly extending the service life of the treated concrete structures. [Means for solving the problem]

[0018] The above-mentioned drawbacks are largely eliminated, and the object of the present invention is achieved by a compound for reinforcing surface treatment, in particular a compound for waterproofing reinforcing surface treatment of concrete containing water glass, according to the present invention, the compound contains 1 to 10% by weight of bis(γ-triethoxysilylpropyl) L) It is characterized by containing tetrasulfide, 89.9-98% by weight of an aqueous solution of lithium silicate, and 0.1-1% by weight of a water glass stabilizer. The advantage of this compound is that it protects not only the concrete surface but also its internal structure for a long time. Very advantageously, a silane is used, which is most preferably bis(γ-triethoxysilylpropyl) L) In addition to its hydrophobizing function, this organic sulfide, in combination with lithium water glass, forms bridges between the concrete substrate and the water glass. Each molecule reacts simultaneously with both the concrete and the water glass particles. The advantage is that bis(γ-triethyloxysilyl) Rup Ropi L)The difference is that tetrasulfides are bifunctional molecules that contain two types of reactive functional groups. A tetrasulfide group is a chain of four sulfur atoms. The so-called disulfide bonds between the four sulfur atoms break down and a metal cation (lithium) binds to the free sulfur atom to form a thiolate. The triethoxysilyl group is sensitive to hydrolysis, and the hydrolyzed siloxy groups bind to the silica particles, resulting in cross-linking. This additive radically changes the overall behavior of the lithium water glass itself. It increases the interconnection with the concrete, filling the porous surface structure of the concrete well. A flexible solid impermeable film is formed on the concrete surface. The concrete is shiny but not slippery. The shiny surface reflects light well, which increases the effect of the lighting in the room and at the same time improves the overall appearance of the floor.

[0019] Advantageously, the waterglass stabilizer is a hydrophilic alkoxyalkyl-ammonium salt.

[0020] Advantageously, the lithium silicate aqueous solution has a molar ratio of SiO2 to Li2O within the range of 3.5 to 4.5.

[0021] The main advantage of the compound according to the invention is that it contains lithium water glass, which prevents practically all retarding processes occurring in concrete. It prevents alkali-silica reactions, carbonation and sulfation, as well as biological attack and leaching by soft water. At the same time, after hardening it reinforces the material and, thanks to its low viscosity, penetrates into the concrete joints and prevents water penetration. At the same time, it is vapor-permeable, allowing the evaporation of residual water from the concrete. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Example 1

[0023] The concrete surface waterproofing reinforcement compound contains 1.3% by weight of bis(γ-triethoxysilylpropyl) L)It contains tetrasulfide, 97.8% by weight of an aqueous lithium silicate solution, and 0.9% by weight of a water glass stabilizer.

[0024] The waterglass stabilizer is a hydrophilic alkoxyalkyl-ammonium salt of N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine in the form of a 98% aqueous solution.

[0025] The lithium silicate aqueous solution has a molar ratio of SiO2 to Li2O of 3.5.

[0026] The resulting compound is poured onto the concrete surface.

[0027] Example 2

[0028] The concrete surface waterproofing reinforcement compound contains 1% by weight of bis(γ-triethoxysilylpropionate). L) It contains tetrasulfide, 98% by weight of an aqueous lithium silicate solution, and 1% by weight of a water glass stabilizer.

[0029] The waterglass stabilizer is a hydrophilic alkoxyalkyl-ammonium salt of N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine in the form of a 98% aqueous solution.

[0030] The lithium silicate aqueous solution has a molar ratio of SiO2 to Li2O of 4.5.

[0031] The resulting compound is poured onto the concrete surface.

[0032] Example 3

[0033] The concrete surface waterproofing reinforcement compound is 10% by weight of bis(γ-triethoxysilylpropyl) L) It contains tetrasulfide, 89.9% by weight of an aqueous lithium silicate solution, and 0.1% by weight of a water glass stabilizer.

[0034] The waterglass stabilizer is a hydrophilic alkoxyalkyl-ammonium salt of N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine in the form of a 98% aqueous solution.

[0035] The lithium silicate aqueous solution has a molar ratio of SiO2 to Li2O of 4.03.

[0036] The resulting compound is poured onto the concrete surface. [Industrial Applicability]

[0037] The reinforcing surface treatment compound can be used in particular for the waterproof reinforcing surface treatment of concrete, but also for any surface treatment, in particular for building materials containing calcium.

Claims

1. 1 to 10% by weight of bis(γ-triethoxysilylpropylsilylpropyl)tetrasulfide; 89.9 to 98% by weight of an aqueous solution of lithium silicate; A compound for reinforcing surface treatment, comprising: 0.1 to 1% by weight of a water glass stabilizer.

2. 2. The reinforcing surface treatment compound according to claim 1, characterized in that said water glass stabilizer is a hydrophilic alkoxyalkyl-ammonium salt.

3. The compound for reinforcing surface treatment according to claim 1 or 2, characterized in that the lithium silicate aqueous solution has a molar ratio of SiO2 to Li2O of 3.5 to 4.5.