CN114702281B - Loose-proof impervious self-repairing waterproof mortar and preparation method thereof - Google Patents
Loose-proof impervious self-repairing waterproof mortar and preparation method thereof Download PDFInfo
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- CN114702281B CN114702281B CN202210402395.2A CN202210402395A CN114702281B CN 114702281 B CN114702281 B CN 114702281B CN 202210402395 A CN202210402395 A CN 202210402395A CN 114702281 B CN114702281 B CN 114702281B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a loosening-preventing and permeability-preventing type self-repairing waterproof mortar and a preparation method thereof, wherein the mortar takes cement as a main body and is characterized by comprising the following components in percentage by weight: 10-40% of Portland cement; 0.08 to 0.3 percent of curing initiator; 0.5-3% of water reducer; 10-60% of quartz sand; 3-15% of filler; 0.66-1.2% of polymer liquid; sodium hydroxide 0.42-0.54%; 0.09-0.12% of cross-linking agent; 0.018-0.03% of crosslinking accelerator; 5-10% of deionized water. According to the scheme of the invention, the anti-seepage capability of the mortar can be greatly improved, the self-repairing defect is achieved, the anti-seepage and plugging-stopping functions are recovered, the anti-seepage strength of the mortar with very low initial anti-seepage strength (0.3 MPa) of the test piece can be improved by several times to very high degree (more than or equal to 1.6 MPa), and the requirement of engineering waterproof use can be met.
Description
Technical Field
The invention belongs to the technical field of special impervious mortar materials, and particularly relates to loosening-resistant impervious self-repairing waterproof mortar and a preparation method thereof.
Background
The existing waterproof material mainly comprises waterproof coiled materials and waterproof paint. The waterproof coiled material mainly comprises a modified asphalt coiled material, a self-adhesive asphalt waterproof coiled material and a high polymer coiled material. The modified asphalt coiled material is like SBS and APP coiled materials which are popular in the current waterproof material market, the flame spray gun is required to carry out on-site surface hot melting, open fire is required, the technical requirement is high, and the surface hot melt adhesive is easy to coke. The width of the coiled material is only one meter, and the coiled material is much lapped when being paved, and the coiled material needs to be cut according to the shape requirement of the base layer, so that the lapped quantity is larger, and the hidden danger of seam water resistance is easily caused; the self-adhesive asphalt waterproof coiled material has the problems of weak adhesive force and easy falling off; the adhesion of the polymer coiled material and the base layer adopts a neoprene adhesive, which has poor water resistance and is easy to cause waterproof failure due to degumming, so the adhesion of the polymer coiled material becomes a key of waterproof quality. The problems and technical defects of the material performance limit the improvement and perfection of the waterproof engineering quality, and a complete scheme is required to be provided to solve the problems.
The waterproof paint is waterproof excellent material, asphalt waterproof paint and polymer waterproof paint. The present macromolecule waterproof paint has better performance and can be made into color, thus the color of the roof is more abundant. The polymer coating adopted at present adopts water emulsion coating based on water emulsion, which adopts cold construction, but the solid content is low and generally not more than (60-70%), the coating thickness in each pass is limited by curing conditions, the coating cannot be quite thick, the film forming needs multiple passes of coating, and the water of the emulsion cannot volatilize under humid conditions, so that the emulsion cannot be cured, and the coating is very inconvenient. The thickness of the waterproof paint is required to be painted for many times to meet the waterproof technical specification, so that the efficacy is greatly influenced, and the application range is limited.
However, the materials are only used for surface protection of building mortar and structures, and the improvement of the body is difficult. Because the aging time of the organic material is short, the organic material is difficult to have the same service life as inorganic materials such as mortar. In addition, the construction conditions are also limited to a certain extent, and are influenced by factors such as the appearance of a building structure, the environment and the like, so that the construction is difficult under a plurality of conditions.
The mortar body is improved, the waterproof and defect repairing capability of the mortar body is improved, and the mortar body is one of very important means for improving the waterproof and anti-seepage performances of a building. At present, polymer emulsion and rubber powder are adopted to be mixed into mortar to improve the compactness and the water resistance. But the cement has no ability to solve the problems of construction and proportioning and the defect loosening and leakage occurring in the later period of cement solidification.
In engineering practice, waterproof mortars are widely used. However, the waterproof failure of the mortar can be caused by the influences of the mortar mixing ratio, the construction method, the maintenance condition and the like and some technological errors. Some water leakage conditions are very complex, and the existing engineering maintenance technology is difficult to operate or has very high maintenance cost, so that great trouble is caused to the use of waterproof mortar.
Disclosure of Invention
In view of the above problems, a first object of the present invention is to provide a loosening and seepage-resistant self-repairing waterproof mortar, which is suitable for building surfaces and solves the problems of loosening and micro-cracking caused by excessive mixing water, improper maintenance, etc. of the mortar.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the anti-loosening impervious self-repairing waterproof mortar takes cement as a main body and comprises the following components in percentage by weight:
10-40% of Portland cement; 0.08 to 0.3 percent of curing initiator;
0.5-3% of water reducer; 10-60% of quartz sand;
3-15% of filler; 0.66-1.2% of polymer liquid;
sodium hydroxide 0.42-0.54%; 0.09-0.12% of cross-linking agent;
0.018-0.03% of crosslinking accelerator; 5-10% of deionized water.
Preferably, the waterproof mortar comprises the following components in percentage by weight:
20-35% of Portland cement; 0.08 to 0.2 percent of curing initiator;
0.5-2% of water reducer; 10-40% of quartz sand;
3-15% of filler; 0.7-1.2% of polymer liquid;
sodium hydroxide 0.42-0.54%; 0.09-0.12% of cross-linking agent;
0.018-0.03% of crosslinking accelerator; and deionized water 7-8%.
Furthermore, the filler is one or two of talcum powder, active calcium carbonate and wollastonite powder, and is used for adjusting the heat of hydration reaction and reducing the cost and is used as an auxiliary material.
Further, the self-repairing agent adopts one or a mixture of more than one of polyamide and polyacrylate high-low crosslinked polymer.
Furthermore, the water reducer adopts one of lignosulfonate, melamine water reducer and powdery polycarboxylate.
Further, the curing initiator is one of ammonium persulfate and sodium persulfate.
Further, the polymer liquid is one of acrylic acid monomer and acrylamide.
Further, the cross-linking agent is one of polyethylene glycol diallyl ether, polyalkylene oxide dialkyi glycol and N, N-methylene bisacrylamide.
Further, the crosslinking accelerator is one of triethanolamine and polyethylene glycol.
The invention further provides a preparation method of the loosening-resistant and permeability-resistant self-repairing waterproof mortar, which comprises the following process steps:
(1) Slowly dripping sodium hydroxide solution into polymer liquid under ice bath or cooling water condition for neutralization to obtain neutral sodium salt solution, controlling the neutralization temperature to be lower than 40 ℃, adding cross-linking agent and cross-linking promoter, and stirring uniformly to obtain self-repairing agent;
(2) Mixing Portland cement and quartz sand according to a certain proportion, adding a filler according to a certain proportion, adding a curing initiator, and uniformly stirring a water reducer;
(3) Uniformly mixing water which is not more than 20% of the cement amount with the self-repairing agent obtained in the step (1), pouring into the dry-mixed cement powder, stirring into a plastic state, and wiping and calendaring the base layer.
The waterproof mortar is coated on the surface layer of the building. When the mortar is used and leakage occurs, the self-curing in water or in a wet state for a period of time can greatly improve the anti-seepage capability, achieve the self-repairing defect and recover the anti-seepage and plugging functions. The anti-seepage strength of the anti-seepage material can be improved in an anti-normal state, for example, after breakdown after the water pressure is increased, the anti-seepage strength can be improved again, and the anti-seepage capability of the anti-seepage material can be recovered. And the repairing capability is still realized after the repairing device is broken down for a plurality of times. The anti-seepage structure has obvious repairing effect, and can improve the mortar anti-seepage strength of the test piece with very low initial anti-seepage strength (0.3 MPa) by several times to very high degree (more than or equal to 1.6 MPa), so that the requirement of engineering waterproof use can be met.
The invention has the advantages that the process of crosslinking the sodium salt of the water-absorbing polymer and the hydration process of cement are carried out simultaneously, and the surface of the water-absorbing polymer is chelated under the condition of rich calcium ions and aluminum ions. Meanwhile, a certain amount of water is increased in the later stage of cement hydration, and the curing degree of mortar is increased. This chelation is limited to water-absorbing polymer surfaces. An egg-shaped material is formed, which is very hard on the surface and soft on the inside. When cement mortar is broken down by water, the polymer has low strength and is broken by the surface strength, so that the internal material can absorb water to expand to block the water channel. And promote hydration crystallization of the unhydrated cement. At the same time, the surface is chelated, more crust is formed, and expansion is stopped. If the water pressure rises again, the shell breaks again, again creating more shell. Greatly improves the impermeability of the mortar.
Compared with the prior art, the invention has the following beneficial effects:
1. the water-absorbing polymer added into the cement material can absorb water and expand immediately after meeting water, the viscosity is increased, the workability is greatly affected, the water-absorbing polymer can shrink after losing water, and a plurality of cracks can be generated by the water-absorbing polymer, so that the water-absorbing polymer is difficult to use. The method thoroughly solves the contradiction that the water-absorbing polymer swells to damage the cement solidification, and can simultaneously perform chain extension and hydration of the water-absorbing material.
2. The free calcium ions of cement are utilized to chelate the water absorbing material in a short time, so that the water absorbing material temporarily loses expansibility, and when the hydraulic pressure force breaks down the polymer balance system, the water channel is immediately expanded and blocked. Achieving the self-repairing performance.
3. Self-healing can also be used in dry and wet alternate environments and still function in the event of repeated cracking.
1. 4, the water absorption rate and the curing time of the water absorbing material can be controlled, and the application range is wider. Since the water absorption of the water absorbing material is determined by the degree of crosslinking at the time of its production, that is, the proportion of the crosslinking agent and the amount of the crosslinking accelerator. The proportion and the absolute value dosage are adjusted. The required water absorption and strength can be obtained. This prevents too high a degree of crosslinking and makes it difficult to expand with water. Affecting repair capability. But also prevents the water absorption from being reduced when the crosslinking degree is too low. The strength of the mortar is lowered due to excessive water absorption. The curing time is controlled by the amount of ammonium persulfate and sodium persulfate as the curing initiator. The amount of the curing agent can control the increase speed of the polymer molecular weight of the curing agent to be matched with the curing speed of the cement material, so that the curing agent becomes solid after the cement is cured, the bonding rate is improved, the curing strength of the cement is prevented from being influenced by too slow speed, and the curing agent and the cement are separated from each other too fast speed.
5. The filler is added into the system as an auxiliary material, so that on one hand, the heat of hydration reaction is regulated, and on the other hand, the cost can be reduced.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The waterproof mortar comprises the following components in percentage by weight:
the preparation method of the waterproof mortar comprises the following steps:
and dissolving sodium hydroxide with deionized water to prepare sodium hydroxide solution, and cooling to room temperature. Slowly dropwise adding sodium hydroxide solution under ice bath or through cooling water to neutralize equimolar acrylic acid to obtain neutral sodium acrylate solution, and controlling the neutralization process temperature below 40 ℃. And adding a crosslinking agent polyethylene glycol diallyl ether and an accelerator triethanolamine, and uniformly stirring to obtain the self-repairing agent.
Silicate cement and quartz sand (river sand) are mixed according to a proportion, wollastonite powder with the proportion of 10 percent is added, ammonium persulfate with the proportion of 0.09 percent and water reducer (lignosulfonate) with the proportion of 1 percent are added, and the mixture is stirred uniformly.
Mixing water with the self-repairing agent and water accounting for 20% of the cement amount, pouring into the dry-mixed cement powder, stirring to form a plastic state, and wiping and calendaring the base layer.
Test of permeation resistance:
example 2
The waterproof mortar comprises the following components in percentage by weight:
the preparation method of the waterproof mortar comprises the following steps:
sodium hydroxide is dissolved by water to prepare sodium hydroxide solution, and the solution is cooled to room temperature. Slowly dropwise adding sodium hydroxide solution under ice bath or through cooling water to neutralize equimolar acrylic acid to obtain neutral sodium acrylate solution, and controlling the neutralization process temperature below 40 ℃. And adding a cross-linking agent N, N-methylene bisacrylamide and an accelerator polyethylene glycol, and uniformly stirring to obtain the self-repairing agent.
Mixing Portland cement and quartz sand (river sand) in proportion, adding talcum powder in proportion of 5%, adding sodium persulfate in proportion of 0.1%, and stirring to obtain water reducer (powdery polycarboxylate) in proportion.
Mixing water with the self-repairing agent and water accounting for 20% of the cement amount, pouring into the dry-mixed cement powder, stirring to form a plastic state, and wiping and calendaring the base layer.
Test of permeation resistance:
example 3
The waterproof mortar comprises the following components in percentage by weight:
the preparation method of the waterproof mortar comprises the following steps:
sodium hydroxide is dissolved by water to prepare sodium hydroxide solution, and the solution is cooled to room temperature. Slowly dropwise adding sodium hydroxide solution under ice bath or through cooling water to neutralize equimolar acrylamide to prepare neutral acrylamide sodium salt solution, and controlling the neutralization temperature to be lower than 40 ℃. And adding a crosslinking agent of polyalkylene oxide and an accelerator of triethanolamine, and uniformly stirring to obtain the self-repairing agent.
Silicate cement and quartz sand (river sand) are mixed according to a certain proportion, then 0.25% of ammonium persulfate and 1% of water reducer (powdery polycarboxylate) are added and stirred uniformly.
Mixing water with the self-repairing agent and water accounting for 20% of the cement amount, pouring into the dry-mixed cement powder, stirring to form a plastic state, and wiping and calendaring the base layer.
Test of permeation resistance:
Claims (8)
1. the loosening-proof impervious self-repairing waterproof mortar takes cement as a main body, and is characterized by comprising the following components in percentage by weight:
10-40% of Portland cement; 0.08 to 0.3 percent of curing initiator;
0.5-3% of water reducer; 10-60% of quartz sand;
3-15% of filler; 0.66-1.2% of polymer liquid;
sodium hydroxide 0.42-0.54%; 0.09-0.12% of cross-linking agent;
0.018-0.03% of crosslinking accelerator; 5-10% of deionized water;
the waterproof mortar is coated on a building surface layer in a scraping way, when leakage occurs, the waterproof mortar can repair defects by itself, restore the anti-seepage function, still has the capability of repairing after being broken down for a plurality of times, and can obtain the anti-seepage strength which is improved by a plurality of times compared with the initial anti-seepage strength;
the polymer liquid is one of acrylic acid monomer and acrylamide;
the preparation method of the waterproof mortar comprises the following process steps:
slowly dripping sodium hydroxide solution into polymer liquid under ice bath or cooling water condition for neutralization to obtain neutral sodium salt solution, controlling the neutralization temperature to be lower than 40 ℃, adding cross-linking agent and cross-linking promoter, and stirring uniformly to obtain self-repairing agent;
mixing Portland cement and quartz sand according to a proportion, adding a filler, a curing initiator and a water reducing agent, and uniformly stirring;
uniformly mixing water which is not more than 20% of the cement amount with the self-repairing agent obtained in the step (1), pouring into the dry-mixed cement powder, stirring into a plastic state, and wiping and calendaring the base layer.
2. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, which is characterized by comprising the following components in percentage by weight:
20-35% of Portland cement; 0.08 to 0.2 percent of curing initiator;
0.5-2% of water reducer; 10-40% of quartz sand;
3-15% of filler; 0.7-1.2% of polymer liquid;
sodium hydroxide 0.42-0.54%; 0.09-0.12% of cross-linking agent;
0.018-0.03% of crosslinking accelerator; and deionized water 7-8%.
3. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, wherein the filler is one or two of talcum powder, activated calcium carbonate and wollastonite powder.
4. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, wherein the self-repairing agent is one of polyamide and polyacrylate high-low crosslinked polymers.
5. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, wherein the water reducer is one of lignosulfonate, melamine water reducer and powdery polycarboxylate.
6. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, wherein the curing initiator is one of ammonium persulfate and sodium persulfate.
7. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, wherein the cross-linking agent is one of polyethylene glycol diallyl ether, polyalkylene oxide glycol and N, N-methylene bisacrylamide.
8. The anti-loosening and anti-permeability self-repairing waterproof mortar according to claim 1, wherein the crosslinking accelerator is one of triethanolamine and polyethylene glycol.
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| CN114702281B true CN114702281B (en) | 2023-07-14 |
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| CN106118481A (en) * | 2016-06-29 | 2016-11-16 | 浙江鲁班建筑防水有限公司 | Self-healing polymers cement waterproof paint and preparation method thereof |
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| DE19812246C2 (en) * | 1998-03-20 | 2001-06-28 | Pci Augsburg Gmbh | Flowable, hydraulically setting mortar system and its use |
| CN106082893B (en) * | 2016-06-29 | 2019-02-05 | 浙江工业大学 | Leak selfreparing waterproof mortar and preparation method thereof |
| CN113880526B (en) * | 2021-11-02 | 2022-11-15 | 中国科学院过程工程研究所 | Building material with waterproof self-repairing function and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106118481A (en) * | 2016-06-29 | 2016-11-16 | 浙江鲁班建筑防水有限公司 | Self-healing polymers cement waterproof paint and preparation method thereof |
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