Back surface repair material and preparation method thereof

Abstract

The present invention discloses a backwater surface repair material comprising the following components, by weight: 20-25 parts sulfoaluminate cement, 5-10 parts fly ash, 40-50 parts quartz sand, 10-15 parts slag, 4-5 parts sodium silicate, 5-10 parts modified nano-titanium oxide, 20-30 parts silicone-acrylic emulsion, 0.1-0.2 parts defoamer, 0.1-0.2 parts water reducer, and 20-30 parts water. The present invention also discloses a method for preparing the backwater surface repair material. The backwater surface repair material provided by the present invention is both rigid and flexible, has good film-forming properties, strong anti-penetration properties, and excellent substrate bonding performance.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a back-water surface repair material and a preparation method thereof. Background Art

[0002] Leaks are common in buildings, and the correct repair methods and materials are crucial. Repair methods and materials differ for the front and back sides of buildings. The term "front" refers to the front side of a building, relative to the back side. Think of it like a container: the inner wall, where the water contacts, is the "front" side, while the outer wall is the back. When a leak develops, due to the pressure, gravity, and tension of the water, a simple treatment of the inner wall compresses the material at the leak, clinging tightly to the inner wall and sealing the leak. However, if the container is already full of water, the leak persists, making treatment of the outer wall more difficult. Therefore, addressing the back side of a building remains a major challenge in waterproofing projects, especially repairs. This places high demands on the materials used to repair the back side.

[0003] Waterproofing materials typically include flexible and rigid materials. Flexible waterproofing materials cannot be used on backwater surfaces. Rigid waterproofing materials must be used to repair leaks on backwater surfaces. Currently, commonly used rigid waterproofing materials include waterproof concrete, waterproof mortar with admixtures and additives, polymer cement waterproof mortar, inorganic waterproof plugging materials, and cement-based penetrating crystalline waterproofing materials, all of which use cement as a continuous phase. Patent application number 202010046168.1 provides a transparent waterproof coating for treating backwater surface seepage. This material is simple to apply and can solve backwater surface leak problems in one go. It comprises the following ingredients, by weight: 45-50 parts silane-modified polyether No. 1, 43-50 parts silicon-modified polymer No. 2, 1-2 parts silane coupling agent, 1-3 parts light stabilizer, 2-3 parts dispersant, 3-5 parts silane penetrant, and 0.5-1 part film-forming aid. Patent application number 202110883430.2 provides a waterproof adhesive for backwater surface plugging and anti-seepage, and its preparation method; it is composed of the following raw materials by weight: 40-60 parts epoxy resin, 10-20 parts trihydroxy polyether, 3-6 parts butanediol diglycidyl ether, 6-10 parts sodium silicate, 3-6 parts 2,6-di-tert-butyl-4-methylphenol, 3-5 parts nano-cerium oxide, 30-45 parts ultrafine silica powder, 0.8-1.2 parts sodium dodecylbenzene sulfonate, 4-7 parts functional additive, 2-5 parts thixotropic agent, 1.0-2.5 parts wetting agent, 0.8-1.5 parts defoaming agent, 2.8-4.2 parts accelerator, 2.5-5.8 parts dewatering agent, and 1.2-2.0 parts penetrant. The above-mentioned prior art waterproofing materials do not bond well with the substrate when applied on a damp substrate, resulting in poor film formation, which affects the repair effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to address the deficiencies in the existing technology, to provide a back-water surface repair material and a preparation method thereof. The back-water surface repair material provided by the present invention is both rigid and flexible, has good film-forming properties, strong anti-penetration ability, and excellent bonding performance with the substrate.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A backwater surface repair material, comprising the following components in parts by weight:

[0007] 20-25 parts of sulphoaluminate cement, 5-10 parts of fly ash, 40-50 parts of quartz sand, 10-15 parts of slag, 4-5 parts of sodium silicate, 5-10 parts of modified nano titanium oxide, 20-30 parts of silicone acrylic emulsion, 0.1-0.2 parts of defoaming agent, 0.1-0.2 parts of water reducing agent, and 20-30 parts of water.

[0008] As a preferred embodiment of the above technical solution, the modified nano-titanium oxide is nano-titanium oxide coated with silicate cement or silicone-acrylic emulsion.

[0009] As a preferred embodiment of the above technical solution, the preparation method of the modified nano-titanium oxide is as follows: the nano-titanium oxide is dried, silicate cement, silicone acrylic emulsion and deionized water are mixed to prepare an atomized mixture, the atomized mixture is loaded into a water sprayer, sprayed onto the surface of the dried nano-titanium oxide, left at room temperature, and then dried to prepare the modified nano-titanium oxide.

[0010] As the preferred embodiment of the above technical solution, every 100cm 3 When nano-titanium oxide is modified, the usage ratio of silicate cement, silicone acrylic emulsion and deionized water is 5g, 2-3ml and 20ml respectively.

[0011] As a preferred embodiment of the above technical solution, the time of standing at room temperature is 20 hours, the drying temperature is 60-70° C., and the mixture is dried to a constant weight.

[0012] As a preferred embodiment of the above technical solution, the solid content of the silicone acrylic emulsion is 40-50%.

[0013] As a preferred embodiment of the above technical solution, the defoaming agent is an organosilicon defoaming agent, and the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.

[0014] In order to better solve the above technical problems, the present invention also provides a method for preparing a back water surface repair material, comprising the following steps:

[0015] Sulphoaluminate cement, fly ash, quartz sand, slag, sodium silicate and water are added into a mixer for the first stirring, and then modified nano titanium oxide, silicone acrylic emulsion, defoamer and water reducer are added for the second stirring and mixing to prepare a backwater surface repair material.

[0016] As a preferred embodiment of the above technical solution, the first stirring and the second stirring are both at 800-1500 rpm, and the time is both 10-30 minutes.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] The back-water surface repair material provided by the present invention includes sulfoaluminate cement, fly ash, quartz sand, slag, sodium silicate, modified nano titanium oxide, silicone acrylic emulsion, defoamer, water reducer and water. The polymer emulsion formed by the chelation, cross-linking and hybridization of inorganic materials and organic materials in the silicone acrylic emulsion not only has good film-forming properties, but also has strong anti-penetration ability, excellent mechanical properties, and excellent bonding properties with the base layer. The addition of modified nano titanium oxide can effectively improve the weather resistance of the material. The addition of slag and sodium silicate, sodium silicate can activate the slag to generate hydrated calcium silicate and hydrated calcium aluminum silicate, thereby reducing the preparation cost of the repair material while ensuring the mechanical properties of the back-water surface repair material. The present invention also coats the surface of the nano titanium oxide with aluminum silicate cement and silicone acrylic emulsion, which can not only effectively improve the hydrophobic properties of the nano titanium oxide, but also improve the mechanical properties of the nano titanium oxide; the back-water surface repair material provided by the present invention has excellent mechanical properties and good anti-penetration properties. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the following examples. It should be understood that these examples are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

[0020] Example 1

[0021] Nano-titanium oxide with an average particle size of 30 nm was dried, and 5 g of Portland cement, 2 ml of silicone-acrylic emulsion with a solid content of 48% and 20 ml of deionized water were mixed to prepare an atomized mixture. The atomized mixture was loaded into a water sprayer and sprayed to a volume of 100 cm 3 The dried nano-titanium oxide surface was placed at room temperature for 20 hours, and then dried at 60°C to constant weight to obtain modified nano-titanium oxide;

[0022] In parts by weight, 23 parts of sulphoaluminate cement, 6 parts of fly ash, 40 parts of quartz sand, 10 parts of slag, 4 parts of sodium silicate and 20 parts of water were added to a mixer and stirred at 800 rpm for 30 minutes. Then, 5 parts of modified nano-titanium oxide, 20 parts of silicone-acrylic emulsion with a solid content of 48%, 0.1 parts of defoaming agent and 0.1 parts of water reducing agent were added and stirred at 800 rpm for 30 minutes to prepare a back-water surface repair material.

[0023] Example 2

[0024] Nano-titanium oxide with an average particle size of 30 nm was dried, and 5 g of Portland cement, 3 ml of silicone-acrylic emulsion with a solid content of 48% and 20 ml of deionized water were mixed to prepare an atomized mixture. The atomized mixture was loaded into a water sprayer and sprayed to a volume of 100 cm 3 The dried nano-titanium oxide surface was placed at room temperature for 20 hours, and then dried at 70°C to constant weight to obtain modified nano-titanium oxide;

[0025] In parts by weight, 21 parts of sulphoaluminate cement, 7 parts of fly ash, 42 parts of quartz sand, 10 parts of slag, 5 parts of sodium silicate and 20 parts of water were added to a mixer and stirred at 1500 rpm for 10 minutes. Then, 6 parts of modified nano-titanium oxide, 20 parts of silicone-acrylic emulsion with a solid content of 48%, 0.1 parts of defoaming agent and 0.1 parts of water reducing agent were added and stirred at 1500 rpm for 10 minutes to prepare a back-water surface repair material.

[0026] Example 3

[0027] Nano-titanium oxide with an average particle size of 30 nm was dried, and 5 g of Portland cement, 2.5 ml of silicone-acrylic emulsion with a solid content of 48% and 20 ml of deionized water were mixed to prepare an atomized mixture. The atomized mixture was loaded into a water sprayer and sprayed to a volume of 100 cm 3 The dried nano-titanium oxide surface was placed at room temperature for 20 hours, and then dried at 65°C to constant weight to obtain modified nano-titanium oxide;

[0028] In parts by weight, 22 parts of sulphoaluminate cement, 5 parts of fly ash, 43 parts of quartz sand, 12 parts of slag, 4 parts of sodium silicate and 22 parts of water were added to a mixer and stirred at 900 rpm for 15 minutes. Then, 6 parts of modified nano-titanium oxide, 23 parts of silicone-acrylic emulsion with a solid content of 48%, 0.15 parts of defoaming agent and 0.1 parts of water reducing agent were added and stirred at 900 rpm for 15 minutes to prepare a back-water surface repair material.

[0029] Example 4

[0030] Nano-titanium oxide with an average particle size of 30 nm was dried, and 5 g of Portland cement, 2 ml of silicone-acrylic emulsion with a solid content of 48% and 20 ml of deionized water were mixed to prepare an atomized mixture. The atomized mixture was loaded into a water sprayer and sprayed to a volume of 100 cm 3 The dried nano-titanium oxide surface was placed at room temperature for 20 hours, and then dried at 65°C to constant weight to obtain modified nano-titanium oxide;

[0031] In parts by weight, 22 parts of sulphoaluminate cement, 6 parts of fly ash, 40 parts of quartz sand, 10 parts of slag, 5 parts of sodium silicate and 22 parts of water were added to a mixer and stirred at 1000 rpm for 15 minutes. Then, 5 parts of modified nano-titanium oxide, 20 parts of silicone-acrylic emulsion with a solid content of 48%, 0.1 parts of defoaming agent and 0.1 parts of water reducing agent were added and stirred at 1000 rpm for 10 minutes to prepare a back-water surface repair material.

[0032] Example 5

[0033] Nano-titanium oxide with an average particle size of 30 nm was dried, and 5 g of Portland cement, 3 ml of silicone-acrylic emulsion with a solid content of 48% and 20 ml of deionized water were mixed to prepare an atomized mixture. The atomized mixture was loaded into a water sprayer and sprayed to a volume of 100 cm 3 The dried nano-titanium oxide surface was placed at room temperature for 20 hours, and then dried at 60°C to constant weight to obtain modified nano-titanium oxide;

[0034] In parts by weight, 20 parts of sulphoaluminate cement, 6 parts of fly ash, 41 parts of quartz sand, 12 parts of slag, 4 parts of sodium silicate and 22 parts of water were added to a mixer and stirred at 800 rpm for 20 minutes. Then, 7 parts of modified nano-titanium oxide, 20 parts of silicone-acrylic emulsion with a solid content of 48%, 0.2 parts of defoaming agent and 0.2 parts of water reducer were added and stirred at 1000 rpm for 15 minutes to prepare a back-water surface repair material.

[0035] Example 6

[0036] Nano-titanium oxide with an average particle size of 30 nm was dried, and 5 g of Portland cement, 3 ml of silicone-acrylic emulsion with a solid content of 48% and 20 ml of deionized water were mixed to prepare an atomized mixture. The atomized mixture was loaded into a water sprayer and sprayed to a volume of 100 cm 3 The dried nano-titanium oxide surface was placed at room temperature for 20 hours, and then dried at 70°C to constant weight to obtain modified nano-titanium oxide;

[0037] In parts by weight, 21 parts of sulphoaluminate cement, 7 parts of fly ash, 42 parts of quartz sand, 10 parts of slag, 5 parts of sodium silicate and 20 parts of water were added to a mixer and stirred at 800 rpm for 20 minutes. Then, 6 parts of modified nano-titanium oxide, 20 parts of silicone-acrylic emulsion with a solid content of 48%, 0.15 parts of defoaming agent and 0.15 parts of water reducing agent were added and stirred at 1000 rpm for 15 minutes to prepare a back-water surface repair material.

[0038] According to the "Polymer Cement Waterproof Mortar" (JC / T984-2005), the performance of the back water surface repair material prepared in the above embodiment was tested, and the test results are shown in Table 1.

[0039] Table 1

[0040]

[0041]

[0042] It can be seen from the above test results that the repair material prepared by the present invention not only has excellent anti-permeability performance, but also has good mechanical properties and excellent bonding properties.

[0043] In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A backwater surface repair material, characterized in that: In parts by weight, it comprises the following components: 20-25 parts of sulphoaluminate cement, 5-10 parts of fly ash, 40-50 parts of quartz sand, 10-15 parts of slag, 4-5 parts of sodium silicate, 5-10 parts of modified nano-titanium oxide, 20-30 parts of silicone-acrylic emulsion, 0.1-0.2 parts of defoamer, 0.1-0.2 parts of water reducer, and 20-30 parts of water; the modified nano-titanium oxide is nano-titanium oxide coated with silicate cement and silicone-acrylic emulsion, and the preparation method of the modified nano-titanium oxide is as follows: drying the nano-titanium oxide, mixing the silicate cement, silicone-acrylic emulsion and deionized water to prepare an atomized mixture, charging the atomized mixture into a sprinkler, spraying it onto the surface of the dried nano-titanium oxide, leaving it at room temperature, and then drying it to prepare the modified nano-titanium oxide.

2. The back surface repair material according to claim 1, characterized in that: Every 100cm 3 When nano-titanium oxide is modified, the usage ratio of silicate cement, silicone acrylic emulsion and deionized water is 5g, 2-3ml and 20ml respectively.

3. The back surface repair material according to claim 1, characterized in that: The time for placing it at room temperature is 20 hours, the drying temperature is 60-70℃, and it is dried to constant weight.

4. The back water surface repair material according to claim 1, characterized in that: The solid content of the raw material and the silicone acrylic emulsion used in the modification of nano titanium oxide is 40-50%.

5. The back surface repair material according to claim 1, characterized in that: The defoaming agent is an organosilicon defoaming agent, and the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.

6. A method for preparing a backwater surface repair material according to any one of claims 1 to 5, characterized in that: The following steps are involved: Sulphoaluminate cement, fly ash, quartz sand, slag, sodium silicate and water are added into a mixer for the first stirring, and then modified nano titanium oxide, silicone acrylic emulsion, defoamer and water reducer are added for the second stirring and mixing to prepare a backwater surface repair material.

7. The method for preparing a backwater surface repair material according to claim 6, characterized in that: The rotation speed of the first stirring and the second stirring are both 800-1500 rpm, and the time of the first stirring and the second stirring are both 10-30 min.

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