CN115974502A - Waterproof and impervious repair mortar and preparation method thereof - Google Patents
Waterproof and impervious repair mortar and preparation method thereof Download PDFInfo
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- CN115974502A CN115974502A CN202211678974.6A CN202211678974A CN115974502A CN 115974502 A CN115974502 A CN 115974502A CN 202211678974 A CN202211678974 A CN 202211678974A CN 115974502 A CN115974502 A CN 115974502A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of concrete admixtures, in particular to waterproof and anti-permeability repair mortar and a preparation method thereof, wherein the raw materials of the waterproof and anti-permeability repair mortar comprise ordinary portland cement, fast-hardening sulphoaluminate cement, gypsum, quartz sand, a silica-coated core-shell structure hydrophobic material, redispersible latex powder, a water-retaining thickening material, lithium carbonate and a water reducing agent; the silica-coated core-shell structure hydrophobic material is prepared by adding a silica-based polymer-based network polymer into an aqueous solution mixed by an organic silicon water repellent and a dispersing agent, and filtering and drying; the silicon dioxide-based polymer-based network polymer is obtained by mixing an oil-in-water emulsion and a prehydrolysate, washing and drying, wherein the oil-in-water emulsion is prepared by uniformly mixing a surfactant and urea-formaldehyde resin and then dripping water; the prehydrolyzate is obtained by heating triacetoxyethylsilane in an acidic aqueous solution. The repair mortar has good waterproofness, permeation resistance, tensile bonding strength and water retention.
Description
Technical Field
The invention relates to the field of building materials, in particular to waterproof and anti-permeability repair mortar and a preparation method thereof.
Background
Concrete is the most used building structural material at present, and the concrete is inevitably cracked and damaged in engineering application due to unreasonable design of concrete structure, construction defects, environmental erosion, improper maintenance and other reasons and the aging of the concrete. The cracking and damage of the concrete will seriously affect the normal use of the concrete structure, and if the concrete structure is not repaired, the concrete structure will bring great potential safety hazard and economic loss.
The existing repair materials include traditional inorganic repair materials such as ordinary portland cement repair mortar, polymer repair materials and polymer modified repair materials, such as polymer cement-based concrete structural waterproof and anticorrosion repair mortar disclosed in patent document with application number CN201010265386.0, and waterproof flexible cement-based dry mixed finishing repair mortar disclosed in patent document with application number CN 201610250722.1.
Because the common cement-based repair mortar is a typical brittle material, the common cement-based repair mortar has a porous loose structure, and has the defects of poor anti-permeability performance, low interface bonding strength, poor freeze-thaw resistance, poor corrosion resistance and the like, particularly the defects of extremely poor anti-permeability performance and overlarge brittleness, high compression-fracture ratio and poor deformation coordination capability. The organic repairing material uses various polymers as cementing materials, and has the advantages of high bonding strength, short curing time, good durability and the like, but has poor compatibility with cement base materials and high cost.
Therefore, the waterproof and anti-permeability repair mortar which has the advantages of good waterproofness, excellent anti-permeability, high tensile bonding strength and good water retention performance is urgently needed to be provided.
Disclosure of Invention
In order to solve the problems of poor compatibility and easy water seepage of the existing cement-based repair mortar in the background art, the invention provides waterproof and anti-permeability repair mortar, wherein the raw materials comprise ordinary portland cement, quick-hardening sulphoaluminate cement, gypsum, quartz sand, a silica-coated core-shell structure hydrophobic material, redispersible latex powder, a water-retaining thickening material, lithium carbonate and a water reducing agent;
the silica-coated core-shell structure hydrophobic material is prepared by adding a silica-based polymer-based network polymer into an aqueous solution mixed by an organic silicon water repellent and a dispersing agent, and filtering and drying;
the silicon dioxide-based polymer-based network polymer is prepared by mixing an oil-in-water emulsion and a prehydrolyzate, adjusting the pH value to 2.0-4.0, stirring at 40-95 ℃, reacting, washing and drying, wherein the oil-in-water emulsion is prepared by uniformly stirring a surfactant and urea-formaldehyde resin at 40-100 ℃ and then dripping water; the prehydrolyzate is obtained by heating triacetoxyethyl silane in an acidic aqueous solution.
Specifically, the preparation method of the silica-coated core-shell structure hydrophobic material comprises the following steps:
heating, stirring and uniformly mixing a surfactant and urea-formaldehyde resin at 40-100 ℃, and slowly dripping distilled water to prepare an oil-in-water emulsion, wherein the dosage of the surfactant is 5-20% of that of the urea-formaldehyde resin, and the dosage of the distilled water is 7-10 times of the total dosage of the surfactant and the urea-formaldehyde resin;
placing triacetoxyethylsilane in an acidic aqueous solution with the pH value of 1.5-4.0, and heating in a water bath until a transparent pre-hydrolysate is obtained, wherein the dosage of the acidic aqueous solution is 2-3 times that of the triacetoxyethylsilane;
and (2) dropwise adding the prehydrolysate into an oil-in-water emulsion, adjusting the pH value of the solution to 2.0-4.0, stirring and reacting at 40-95 ℃ for 3-6 h at the rotating speed of 300-600 rpm, cooling to room temperature, repeatedly washing and drying to obtain the silicon dioxide-based polymer-based network polymer, wherein the pH value of the solution can be adjusted by hydrochloric acid, acetic acid or nitric acid.
And (2) uniformly stirring the organic silicon water repellent and a dispersing agent in water to obtain a core layer, taking the prepared silica-based polymer-based network polymer as a shell layer, adding the shell layer into the core layer while stirring, continuously stirring for 2-3 h, filtering and drying to obtain the silica-coated shell-core structure hydrophobic material.
In one embodiment, the amount of the surfactant is 5-20% of the mass of the urea-formaldehyde resin; the dosage of the triacetoxyethyl silane is 0.5 to 2 times of the mass of the urea-formaldehyde resin.
In one embodiment, the surfactant is one or more of alkylphenol ethoxylates, polyoxyethylene sorbitan monooleate, alkylbenzene sulfonates, alkylsulfonates, and gum arabic.
In one embodiment, the acidic aqueous solution is prepared by adding hydrochloric acid, acetic acid or nitric acid into water.
In one embodiment, the dispersant is one of sodium dodecylbenzene sulfonate and sodium dodecyl sulfate.
In one embodiment, the mass ratio of the organosilicon water repellent to the dispersant is 1:2 to 3.5.
In one embodiment, the mass ratio of the core layer to the shell layer is 1:2 to 5.
In one embodiment, the water-retaining agent comprises, by weight, 200-300 parts of ordinary portland cement, 150-250 parts of quick-hardening sulphoaluminate cement, 20-50 parts of gypsum, 350-500 parts of quartz sand, 10-30 parts of silica-coated shell-core structure hydrophobic material, 50-100 parts of redispersible latex powder, 1-3 parts of water-retaining thickening material, 0.3-1.0 part of lithium carbonate and 0.5-5 parts of water reducing agent.
In one embodiment, the Portland cement is Portland cement with the strength grade being more than or equal to 42.5.
In one embodiment, the redispersible latex powder is at least one of polyethylene vinyl acetate, polyethylene vinyl acetate-vinyl versatate, polystyrene-acrylate, and polyacrylate.
In one embodiment, the water-retaining thickening material is at least one of Methylcellulose (MC), hydroxyethylcellulose (HEC), hydroxyethylmethylcellulose (HEMC), and Hydroxypropylmethylcellulose (HPMC).
In one embodiment, the water reducing agent is a powdery polycarboxylate water reducing agent with a water reducing rate of more than or equal to 25%.
The invention also provides a preparation method of the waterproof and anti-permeability repair mortar, and specifically relates to
And uniformly mixing ordinary portland cement, quick-hardening sulphoaluminate cement, gypsum, quartz sand, a shell-core structure hydrophobic material, redispersible latex powder, a water-retaining thickening material, lithium carbonate and a water reducing agent according to a proportion to prepare the dry powder waterproof and anti-permeability repair mortar.
Compared with the prior art, the waterproof and anti-permeability repair mortar provided by the invention has the following technical principles and beneficial effects:
(1) The core layer of the core-shell structure hydrophobic material coated by the silicon dioxide prepared by the invention is the organic silicon water repellent and the dispersing agent, and the shell layer is the silicon dioxide-based polymer-based network polymer, so that the water absorption of the cement-based material and the permeability of the surface of the mortar and capillary tubes can be greatly reduced, the anti-corrosion capability of the mortar is improved, and the waterproof performance of the repair mortar is further improved.
(2) The repair mortar of the invention adopts a ternary system of cementing materials (ordinary portland cement, quick-hardening sulphoaluminate cement and gypsum) to generate ettringite in the hydration process, and the shrinkage of the cement is compensated by the principle of micro-expansion of the ettringite. And the combination of the quick-hardening sulphoaluminate cement and the lithium carbonate is adopted, so that the setting time of the repair mortar can be adjusted.
(3) The redispersible latex powder is added into the repair mortar, the polymer particles are attached to the cement hydration product and are filled in the internal pores of the mortar, and the cement hydration product and the polymer form a mutually interlaced space network membrane structure along with the cement hydration action and the polymer film forming process, so that the repair mortar has a certain connection action on the mortar, improves the adhesion between the cement hydration product and the aggregate, slows down the cracking of the mortar, and improves the crack resistance, the toughness, the breaking strength and the impermeability of the mortar.
(4) The waterproof and impervious repair mortar provided by the invention has better waterproofness, impermeability, tensile bonding strength, water retention property and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention also provides the following embodiments:
example 1
(1) Preparation of silica-coated core-shell structure hydrophobic material
S1: uniformly mixing 30g of alkylphenol polyoxyethylene and 150g of urea-formaldehyde resin under heating and stirring at 40 ℃, and slowly dropwise adding 1500g of distilled water to prepare an oil-in-water emulsion;
placing 150g of triacetoxyethylsilane in 300g of acetic acid aqueous solution with the pH value of 2.2, and placing the solution in a water bath at the temperature of 60 ℃ to hydrolyze by 50 min to obtain a transparent prehydrolyzate;
and dropwise adding the prehydrolysate into an oil-in-water emulsion, adjusting the pH value of the solution to 2.5 +/-0.1, stirring and reacting for 6 hours at 40 ℃ at the rotating speed of 300rpm, cooling to room temperature, repeatedly washing and drying to obtain the silicon dioxide-based polymer-based network polymer.
S2: and (2) stirring and mixing 10g of organic silicon water repellent and 20g of sodium dodecyl benzene sulfonate uniformly in water, then adding 60g of silicon dioxide-based polymer-based network polymer while stirring, continuing stirring for 2 hours, filtering and drying to obtain the silicon dioxide-coated core-shell structure hydrophobic material.
(2) Preparation of waterproof and impervious repair mortar
Weighing 200 parts of P.O52.5R ordinary Portland cement, 250 parts of fast-hardening sulphoaluminate cement, 20 parts of gypsum, 500 parts of quartz sand, 30 parts of silica-coated shell-core structure hydrophobic material, 50 parts of polyethylene vinyl acetate, 1 part of methyl cellulose, 0.3 part of lithium carbonate and powdery polycarboxylate superplasticizer
540P 5 parts, and uniformly mixing to prepare dry powder waterproof and anti-permeability repair mortar.
Example 2
(1) Preparation of silica-coated core-shell structure hydrophobic material
S1: uniformly mixing 30g of polyoxyethylene sorbitan monooleate and 150g of urea-formaldehyde resin under heating and stirring at 60 ℃, and slowly dropwise adding 1500g of distilled water to prepare an oil-in-water emulsion;
placing 300g of triacetoxyethylsilane in 600g of hydrochloric acid aqueous solution with the pH value of 2.1, and placing the mixture in a water bath at the temperature of 60 ℃ to hydrolyze for 50 min to obtain a transparent prehydrolyzate;
and (3) dropwise adding the prehydrolysate into an oil-in-water emulsion, adjusting the pH value of the solution to 3.0 +/-0.1, stirring and reacting for 3 hours at the temperature of 55 ℃ at the rotating speed of 450rpm, cooling to room temperature, repeatedly washing and drying to obtain the silicon dioxide-based polymer-based network polymer.
S2: stirring and mixing 10g of organic silicon water repellent and 30g of sodium dodecyl benzene sulfonate uniformly in water, then adding 120g of silicon dioxide based polymer-based network polymer while stirring, continuing stirring for 2 hours, filtering and drying to obtain the silicon dioxide coated core-shell structure hydrophobic material.
(2) Preparation of waterproof and anti-permeability repair mortar
Weighing 300 parts of P.O52.5 ordinary Portland cement, 200 parts of quick-hardening sulphoaluminate cement, 30 parts of gypsum, 450 parts of quartz sand, 20 parts of silica-coated shell-core structure hydrophobic material, 60 parts of polyacrylate, 2 parts of hydroxyethyl cellulose, 0.5 part of lithium carbonate, and a powdery polycarboxylate superplasticizer
540P 1 part, mixing well to obtain dry productPowdery waterproof and anti-permeability repair mortar.
Example 3
(1) Preparation of silica-coated core-shell structure hydrophobic material
S1: uniformly mixing 15g of alkylbenzene sulfonate and 100g of urea-formaldehyde resin under the condition of heating and stirring at 70 ℃, slowly dropwise adding 1500g of distilled water to prepare an oil-in-water emulsion;
50g of triacetoxyethylsilane was put in 150g of an aqueous hydrochloric acid solution having a pH value of 2.1, and hydrolyzed in a water bath at 60 ℃ for 50 min to obtain a transparent prehydrolyzate;
and dropwise adding the prehydrolysate into an oil-in-water emulsion, adjusting the pH value of the solution to 2.0 +/-0.1, stirring and reacting for 4 hours at the temperature of 60 ℃ at the rotating speed of 500rpm, cooling to room temperature, repeatedly washing and drying to obtain the silicon dioxide-based polymer-based network polymer.
S2: stirring and mixing 10g of organic silicon water repellent and 35g of sodium dodecyl sulfate in water uniformly, then adding 180g of silicon dioxide based polymer-based network polymer while stirring, continuing stirring for 2 hours, filtering and drying to obtain the silicon dioxide coated shell-core structure hydrophobic material.
(2) Preparation of waterproof and impervious repair mortar
Weighing 250 parts of P.O 42.5R ordinary Portland cement, 250 parts of quick-hardening sulphoaluminate cement, 40 parts of gypsum, 400 parts of quartz sand, 10 parts of silica-coated shell-core structure hydrophobic material, 100 parts of polyvinyl acetate-vinyl versatate, 3 parts of hydroxyethyl methyl cellulose, 1 part of lithium carbonate and a powdery polycarboxylic acid water reducer
540P 2 parts, and uniformly mixing to prepare dry powder waterproof and anti-permeability repair mortar.
Example 4
(1) Preparation of silica-coated core-shell structure hydrophobic material
S1: uniformly mixing 5g of Arabic gum and 100g of urea-formaldehyde resin under heating and stirring at 90 ℃, and slowly dropwise adding 1500g of distilled water to prepare an oil-in-water emulsion;
placing 150g of triacetoxyethylsilane in 300g of nitric acid aqueous solution with the pH value of 2.1, and placing the solution in a water bath at the temperature of 60 ℃ to hydrolyze by 50 min to obtain a transparent prehydrolyzate;
and (3) dropwise adding the prehydrolysate into an oil-in-water emulsion, adjusting the pH value of the solution to 4.0 +/-0.1, stirring and reacting for 5 hours at 95 ℃ at the rotating speed of 600rpm, cooling to room temperature, repeatedly washing and drying to obtain the silicon dioxide-based polymer-based network polymer.
S2: stirring and mixing 10g of organic silicon water repellent and 23g of sodium dodecyl sulfate in water uniformly, then adding 165g of silicon dioxide based polymer-based network polymer while stirring, continuing stirring for 2 hours, filtering and drying to obtain the silicon dioxide coated core-shell structure hydrophobic material.
(2) Preparation of waterproof and anti-permeability repair mortar
Weighing 280 parts of P.O 42.5 ordinary portland cement, 150 parts of fast-hardening sulphoaluminate cement, 50 parts of gypsum, 350 parts of quartz sand, 10 parts of silica-coated shell-core structure hydrophobic material, 70 parts of polystyrene-acrylate, 2 parts of hydroxypropyl methyl cellulose, 0.7 part of lithium carbonate, and powdery polycarboxylate superplasticizer
540P 3 parts, and uniformly mixing to prepare dry powder waterproof and anti-permeability repair mortar.
It should be noted that the specific parameters or some reagents in the above embodiments are specific examples or preferred embodiments of the present invention, and are not limited thereto; those skilled in the art can adapt the same within the spirit and scope of the present invention.
The invention also provides the following comparative examples
Comparative examples 1 to 4
The silica-coated core-shell structure hydrophobic materials of examples 1 to 4 were removed, respectively, to obtain comparative examples 1 to 4.
Comparative example 5
The quality of organosilicon water repellent is adopted to replace the silica-coated core-shell structure hydrophobic material in the embodiment 1, and the rest is consistent with the embodiment 1.
Comparative example 6
The multicomponent copolymer water repellent was used in place of the silica-coated core-shell hydrophobic material of example 1 in equal mass, and the rest was the same as example 1.
Comparative example 7
P.o52.5r ordinary portland cement was used instead of the rapid hardening sulfoaluminate cement and gypsum in example 1, and the remainder was in accordance with example 1.
The mortar prepared in each example and comparative example was subjected to a performance test according to JCT 2381-2016 repair mortar, and the results are shown in Table 1:
TABLE 1
From the results in table 1, it can be seen that the waterproof and impervious repair mortar prepared by the examples has the advantages of excellent impermeability, small water absorption, high strength, good adhesion with the base layer, low shrinkage, and the like.
Compared with the conventional water repellent or hydrophobic material, the silica-coated core-shell structure hydrophobic material provided by the invention has the advantages that the tensile adhesive strength, the waterproof performance and the anti-permeability capability of the finished mortar are obviously improved.
As can be seen from comparative example 7, the invention adopts ordinary portland cement, quick-hardening sulphoaluminate cement and gypsum as the cementing materials, and can effectively improve the shrinkage of mortar compared with the cementing materials of single ordinary portland cement.
In conclusion, the waterproof and impervious repair mortar provided by the invention has better waterproofness, impermeability, tensile bonding strength and dry shrinkage resistance, and effectively overcomes the defects of poor compatibility and easy water seepage of the existing cement-based repair mortar.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The waterproof and impervious repair mortar is characterized in that the raw materials comprise ordinary portland cement, quick-hardening sulphoaluminate cement, gypsum, quartz sand, a silica-coated shell-core structure hydrophobic material, redispersible latex powder, a water-retaining thickening material, lithium carbonate and a water reducing agent;
the silica-coated core-shell structure hydrophobic material is prepared by adding a silica-based polymer-based network polymer into an aqueous solution mixed by an organic silicon water repellent and a dispersing agent, and filtering and drying;
the silicon dioxide-based polymer-based network polymer is prepared by mixing an oil-in-water emulsion and a prehydrolyzate, adjusting the pH value to 2.0-4.0, stirring at 40-95 ℃, reacting, washing and drying, wherein the oil-in-water emulsion is prepared by uniformly stirring a surfactant and urea-formaldehyde resin at 40-100 ℃ and then dripping water; the prehydrolyzate is obtained by heating triacetoxyethylsilane in an acidic aqueous solution.
2. The waterproof and impervious repair mortar of claim 1, wherein: the dosage of the surfactant is 5-20% of the mass of the urea-formaldehyde resin; the dosage of the triacetoxyethyl silane is 0.5 to 2 times of the mass of the urea-formaldehyde resin.
3. The waterproof and impervious repair mortar of claim 1, wherein: the surfactant is one or more of alkylphenol polyoxyethylene, polyoxyethylene sorbitan monooleate, alkylbenzene sulfonate, alkyl sulfonate and acacia.
4. The waterproof and impervious repair mortar of claim 1, wherein: the acidic aqueous solution is obtained by adding hydrochloric acid, acetic acid or nitric acid into water for regulation.
5. The waterproof and impervious repair mortar of claim 1, wherein: the dispersant is one of sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.
6. The waterproof and impervious repair mortar of claim 1, wherein: the cement comprises, by weight, 200-300 parts of ordinary portland cement, 150-250 parts of quick-hardening sulphoaluminate cement, 20-50 parts of gypsum, 350-500 parts of quartz sand, 10-30 parts of silica-coated shell-core structure hydrophobic material, 50-100 parts of redispersible latex powder, 1-3 parts of water-retaining thickening material, 0.3-1.0 part of lithium carbonate and 0.5-5 parts of water reducing agent.
7. The waterproof and impervious repair mortar of claim 1, wherein: the ordinary portland cement is ordinary portland cement with the strength grade of more than or equal to 42.5.
8. The waterproof and impervious repair mortar of claim 1, wherein: the redispersible latex powder is at least one of polyethylene vinyl acetate, polyethylene-vinyl versatate, polystyrene-acrylate 5 and polyacrylate.
9. The waterproof and impervious repair mortar of claim 1, wherein: the water-retaining thickening material is at least one of methylcellulose, hydroxyethyl cellulose, hydroxyethyl methylcellulose and hydroxypropyl methylcellulose.
10. Method 0 for preparing a waterproof and impervious repair mortar according to any one of claims 1 to 9, comprising the following preparation steps: and uniformly mixing the ordinary portland cement, the quick-hardening sulphoaluminate cement, the gypsum, the quartz sand, the shell-core structure hydrophobic material, the redispersible latex powder, the water retention thickening material, the lithium carbonate and the water reducing agent according to the proportion to obtain the dry powder waterproof and anti-permeability repair mortar.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103951365A (en) * | 2014-04-15 | 2014-07-30 | 华南理工大学 | Portland cement-sulphate aluminum cement-gypsum-polymer composite waterproof mortar and preparation method thereof |
| CN110451898A (en) * | 2019-08-16 | 2019-11-15 | 北京市高强混凝土有限责任公司 | A kind of early strong repairing mortar of polymer |
| CN111777367A (en) * | 2020-07-15 | 2020-10-16 | 浙江忠信新型建材股份有限公司 | Waterproof repair mortar for building wall and preparation method thereof |
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- 2022-12-26 CN CN202211678974.6A patent/CN115974502A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103951365A (en) * | 2014-04-15 | 2014-07-30 | 华南理工大学 | Portland cement-sulphate aluminum cement-gypsum-polymer composite waterproof mortar and preparation method thereof |
| CN110451898A (en) * | 2019-08-16 | 2019-11-15 | 北京市高强混凝土有限责任公司 | A kind of early strong repairing mortar of polymer |
| CN111777367A (en) * | 2020-07-15 | 2020-10-16 | 浙江忠信新型建材股份有限公司 | Waterproof repair mortar for building wall and preparation method thereof |
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