CN111848025A - Capillary crystalline cement-based waterproof coating and preparation method thereof - Google Patents
Capillary crystalline cement-based waterproof coating and preparation method thereof Download PDFInfo
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- CN111848025A CN111848025A CN202010564582.1A CN202010564582A CN111848025A CN 111848025 A CN111848025 A CN 111848025A CN 202010564582 A CN202010564582 A CN 202010564582A CN 111848025 A CN111848025 A CN 111848025A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
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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
- 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
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Abstract
The invention relates to the technical field of waterproof coatings and preparation methods thereof, in particular to a capillary crystalline cement-based waterproof coating, which comprises the following components: 3-8 parts of medical stone composite super absorbent resin, 5-10 parts of crystallization activator, 30-50 parts of portland cement, 15-30 parts of quartz sand and 10-25 parts of inorganic filler. The preparation method comprises the following steps: grinding and dispersing the raw materials uniformly to obtain the product. The invention solves the problem of low compactness of concrete and poor waterproof performance caused by the cement-based crystalline waterproof coating in the prior art. The permeable crystallization type cement-based waterproof coating can be added with the medical stone composite water-absorbent resin to improve the water retention of the coating, thereby ensuring the hydration of cement and the sustainable permeation of crystallization activators. After construction, the medical stone composite water-absorbing resin continuously permeates into concrete capillary pores after the hydration of the crystallization activating agent is ensured through the water retention-release process, reacts and crystallizes in the concrete capillary pores, so that the capillary pores are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of waterproof coatings and preparation methods thereof, in particular to a capillary crystalline cement-based waterproof coating and a preparation method thereof.
Background
The cement-base waterproof paint is a kind of powdery waterproof paint containing active compound, and is a kind of rigid, permeable crystalline waterproof slurry prepared by mixing unique active chemical substances in the presence of water. Active substances contained in the product permeate into capillary pores in the substrate under the drive of water by utilizing the porosity of a concrete structure on a wet base surface through capillary phenomenon, and the capillary phenomenon generates chemical reaction to form a water-insoluble dendritic fiber crystal which is integrated with the substrate, thereby directly playing a good waterproof and reinforcing effect on the concrete structure.
The cement-based capillary crystalline waterproof coating has the advantages of energy conservation, environmental protection, no harm to human health, simple production process, low cost, simple and convenient construction process, long waterproof effect, wide application prospect and the like. Most of the commonly used cement-based waterproof materials belong to surface sealing waterproof agents, the waterproof effect only acts on the surface, the waterproof materials cannot automatically and deeply permeate into the structure, and the permeation resistance pressure is low; the waterproof effect is not lasting, a continuous degradation process is generated along with the time, once the waterproof layer is damaged, the waterproof capability is lost, and the secondary anti-permeability capability is not realized.
The active chemical substance contained in the cement-based permeable crystalline waterproof material permeates into the concrete structure on a wet base surface by utilizing the porosity of the concrete structure through capillary phenomenon and utilizing the hydrophilicity of the material, and water is taken as a carrier to permeate into the concrete structure until reaching the place with cracks and leakage in the concrete. After the cement-based permeable crystalline waterproof material is in contact with water, calcium hydroxide precipitated in the hydration reaction process of calcium silicate and cement is catalyzed to be in interactive reaction with the calcium silicate, a water-insoluble dendritic fiber crystal is formed, and the calcium hydroxide is expanded in water in a concrete structure, so that capillary holes and cracks in the structure are filled and compacted, and therefore water is blocked, the aim of preventing water is fulfilled, and the self-waterproof capacity of concrete is improved.
However, most of the currently used crystalline waterproof coatings are based on quick-setting cement, so that the construction time can be reduced, but because hydration and permeation of the crystalline activating substances require participation of water, if the crystalline activating substances are solidified too early, the crystalline activating substances cannot permeate into concrete pores, and the waterproof performance of the concrete is reduced. At the same time, although the existing rigid crystalline waterproof coating has good compressive strength, the waterproof coating is easy to shrink due to drying, chemical shrinkage and carbonization shrinkage in the drying process due to strong rigidity, so that the volume of the waterproof coating shrinks to form cracks on the surface layer of the waterproof coating, and the waterproof performance of the waterproof coating is reduced.
Chinese patent publication No. CN106978028B discloses a polymer cement-based waterproof coating with a photocatalytic function, which consists of an inner layer coating and an outer layer coating. The invention also discloses a preparation method of the polymer cement-based waterproof coating. The construction method can greatly shorten the construction period, and finally reduce the surface drying time by 1-3 h and the actual drying time by 2-4 h. Nano TiO 22As an ultraviolet screening agent, a double-layer material is formed by utilizing the difference of the grain diameter and the crystal form, and the rutile type nano TiO with large grain diameter at the inner layer2Reflecting ultraviolet ray, external layer small grain size anatase type nano TiO2Absorb ultraviolet rays and obviously improve the aging resistance of the coating. The polymer cement-based waterproof coating has high content of nano titanium dioxide, so that the polymer cement-based waterproof coating has high overall cost and no universality.
Chinese patent publication No. CN110550901A discloses a cement-based capillary crystalline waterproof coating, which mainly comprises portland cement, silica sand and active chemical substances, is a gray powder material, can be constructed by a dry scattering method or a brushing method, and has strong permeability on the surface of a cement base. However, the waterproof coating is a full-rigid material, so that cracking is easy to occur in the drying process, and meanwhile, the silicate cement is high in drying speed, so that the crystallization activator cannot penetrate into concrete capillary pores to crystallize and block the capillary pores, and the waterproof performance is reduced.
In the prior art, the drying speed of a crystallization activator in a cement-based crystallization type waterproof coating is high, so that the crystallization activator does not permeate into concrete pores, and the problem of low compactness and poor waterproof performance of concrete is caused.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention aims to provide a permeable crystalline cement-based waterproof coating for solving the problem of poor waterproof performance due to low compactness of concrete caused by the cement-based crystalline waterproof coating in the prior art, and also provides a preparation method of the permeable crystalline cement-based waterproof coating. The permeable crystallization type cement-based waterproof coating can be added with the medical stone composite water-absorbent resin to improve the water retention of the coating, thereby ensuring the hydration of cement and the sustainable permeation of crystallization activators. After construction, the medical stone composite water-absorbing resin continuously permeates into concrete capillary pores after the hydration of the crystallization activating agent is ensured through the water retention-release process, reacts and crystallizes in the concrete capillary pores, so that the capillary pores are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is improved.
In order to attain the above and other related objects,
the invention provides a permeable crystallization type cement-based waterproof coating, which comprises the following components in parts by weight: 3-8 parts of medical stone composite super absorbent resin, 5-10 parts of crystallization activator, 30-50 parts of portland cement, 15-30 parts of quartz sand and 10-25 parts of inorganic filler.
The super absorbent resin is a novel functional polymer material, has hydrophilic groups, can absorb a large amount of water, swells and can keep the synthetic resin without outflow of water, such as starch grafted acrylate, grafted acrylamide, high-substitution-degree crosslinked carboxymethyl cellulose, crosslinked carboxymethyl cellulose grafted acrylamide, crosslinked hydroxyethyl cellulose grafted acrylamide polymer and the like, can generally absorb water which is equivalent to more than 100 times of the volume of the resin, and the highest water absorption rate can reach more than 1000 times.
Compared with the common super absorbent resin, the medical stone composite super absorbent resin has better water retention performance and saline water absorption performance. Before water absorption, the composite super absorbent resin (namely the medical stone composite super absorbent resin) with medical stone intercalated is mutually close and wound together and mutually crosslinked into a net structure, thereby achieving the integral fastening. When contacting with water, water molecules permeate into the medical stone composite super absorbent resin through capillary action and diffusion action, and ionized groups on chains are ionized in water. The polymer chains are stretched and swollen due to electrostatic repulsion between the same ions on the chains. Due to the requirement of electric neutrality, counter ions cannot migrate to the outside of the resin, and the ion concentration difference between the solution inside and outside the resin forms reverse osmosis pressure. The water further enters the medical stone composite super absorbent resin under the action of reverse osmosis pressure to form hydrogel.
The permeable crystallization type cement-based waterproof coating increases the water retention performance of the coating by virtue of the excellent water absorption performance of the medical stone composite water-absorbent resin, and finally ensures the hydration of cement and the sustainable permeation of a crystallization activator.
After construction, the medical stone composite water-absorbing resin is subjected to a water retention-release process, so that the crystalline activator is ensured to continuously permeate into concrete pores after hydration, reacts and crystallizes in the concrete pores (forming water-insoluble dendritic fiber crystallisates), and expands water in a concrete structure, so that the pores and cracks in the structure are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is also improved.
Meanwhile, the flexibility of the cement base can be improved by adding the medical stone composite water-absorbing resin, and the medical stone composite water-absorbing resin has excellent water retention performance and saline water absorption performance, so that water can be gradually released from the medical stone composite water-absorbing resin after water in the cement base is evaporated, and the cement base is prevented from being plastically contracted to form cracks due to water evaporation, so that the effect of preventing the cement base from cracking is achieved.
The water-absorbing resin is added into the waterproof coating after being modified by the medical stone, so that the compressive strength of the coating is not reduced, the tensile strength of the coating can be improved, the cement-based coating has good flexibility, and the problems of poor compactness and strong rigidity and easiness in cracking of the concrete waterproof coating are solved.
Further, the capillary crystalline cement-based waterproof coating comprises the following components in parts by weight: 4-6 parts of medical stone composite super absorbent resin, 7-9 parts of crystallization activator, 35-45 parts of portland cement, 20-25 parts of quartz sand, 15-20 parts of inorganic filler and 2-6 parts of water reducer.
The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump constant of concrete. Most of the water reducing agents belong to anionic surfactants, such as lignosulfonate, naphthalene sulfonate formaldehyde polymer, polycarboxylic acid high-efficiency water reducing agent and the like. After the concrete mixture is added, the dispersion effect on cement particles is achieved, the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.
Further preferably, the permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 5 parts of medical stone composite super absorbent resin, 8 parts of crystallization activator, 39 parts of portland cement, 22 parts of quartz sand, 17 parts of inorganic filler and 4 parts of water reducer.
Further, the medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 3-8 parts of acrylic acid, 10-20 parts of water, 2-6 parts of medical stone, 0.5-1 part of ammonium persulfate and 0.5-1 part of N, N' -methylene bisacrylamide.
Acrylic acid and N, N' -methylene bisacrylamide are subjected to polymerization reaction, ammonium persulfate is used as an initiator, and medical stone is intercalated to finally form the medical stone composite super absorbent resin.
Maifanitum is a natural silicate mineral, and is a compound mineral or medicinal rock with no toxicity and harm to living things and certain bioactivity. The main chemical component of medical stone is inorganic aluminosilicate. The medical stone has porosity (spongy porosity), huge surface area and strong adsorption capacity. Therefore, the medical stone composite super absorbent resin formed by intercalating the medical stone has a synergistic effect on the aspect of water retention on the basis of the common super absorbent resin, and has better water retention performance and salt water absorption performance.
Further, the crystallization activator is at least one of ethylenediamine diphthalic acetate, gluconate, hydroxyethylidene diphosphate and ethylenediamine tetramethylene phosphate.
The crystallization activator permeates into concrete capillary after hydration, reacts and crystallizes in the concrete capillary (forming branch and tendril fiber crystallisates which are insoluble in water), and expands in water inside a concrete structure, so that the capillary and cracks in the structure are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is also improved.
Further, the inorganic filler comprises the following components in parts by weight: 0.8-1.2 parts of aluminum hydroxide, 0.3-0.6 part of zinc oxide, 0.3-0.6 part of lithium chromate and 1.2-1.5 parts of sodium-based nano bentonite.
The aluminum hydroxide has a certain flame retardant effect, and can enhance the flame retardant property of the waterproof coating. The zinc oxide can enhance the thermal stability and toughness of the waterproof coating. The sodium-based nano-swelling can improve the specific gravity, the wear resistance, the weather resistance and the like of the waterproof coating. The aluminum hydroxide, the zinc oxide, the lithium chromate and the sodium-based nano bentonite are used for enhancing the overall strength of the waterproof coating and simultaneously enhancing the ductility and the flame retardant property of the waterproof coating.
Further, the water reducing agent is a powdery polycarboxylic acid high-efficiency water reducing agent.
In a second aspect of the present invention, there is provided a method for preparing the above capillary crystalline cement-based waterproof coating, comprising: the medical stone composite super absorbent resin, the crystallization activator, the silicate cement, the quartz sand and the inorganic filler are ground and dispersed uniformly according to the weight part ratio to obtain the permeable crystallization type cement-based waterproof coating.
The permeable crystallization type cement-based waterproof coating increases the water retention performance of the coating by virtue of the excellent water absorption performance of the medical stone composite water-absorbent resin, and finally ensures the hydration of cement and the sustainable permeation of a crystallization activator. After construction, the medical stone composite water-absorbing resin is subjected to a water retention-release process, so that the crystalline activator is ensured to continuously permeate into concrete pores after hydration, reacts and crystallizes in the concrete pores (forming water-insoluble dendritic fiber crystallisates), and expands water in a concrete structure, so that the pores and cracks in the structure are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is also improved. Meanwhile, the flexibility of the cement base can be improved by adding the medical stone composite water-absorbing resin, and the medical stone composite water-absorbing resin has excellent water retention performance and saline water absorption performance, so that water can be gradually released from the medical stone composite water-absorbing resin after water in the cement base is evaporated, and the cement base is prevented from being plastically contracted to form cracks due to water evaporation, so that the effect of preventing the cement base from cracking is achieved.
The preparation process of the permeable crystallization type cement-based waterproof coating is relatively simple and is suitable for industrial production.
Further, the grinding and dispersing process specifically comprises the following steps: grinding the mixture in a ball mill at a speed of 45-65 r/min for 30-60 min, and standing for 3-8 min. The permeable crystallization type cement-based waterproof coating is prepared into uniform and fine slurry through ball milling in the preparation process, and has better ductility and construction performance.
Further, the specific preparation process of the medical stone composite super absorbent resin comprises the following steps: according to the weight ratio of the components, adding acrylic acid into water, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 65-75 ℃, carrying out polymerization reaction for 5-8 hours, and drying to obtain the medical stone composite super absorbent resin.
Acrylic acid and N, N' -methylene bisacrylamide are subjected to polymerization reaction, ammonium persulfate is used as an initiator, and medical stone is intercalated to finally form the medical stone composite super absorbent resin.
As mentioned above, the permeable crystallization type cement-based waterproof coating and the preparation method thereof have the following beneficial effects:
1. the permeable crystallization type cement-based waterproof coating increases the water retention performance of the coating by virtue of the excellent water absorption performance of the medical stone composite water-absorbent resin, and finally ensures the hydration of cement and the sustainable permeation of a crystallization activator.
2. After construction, the medical stone composite water-absorbing resin is subjected to a water retention-release process, so that the crystalline activator is ensured to continuously permeate into concrete pores after hydration, reacts and crystallizes in the concrete pores (forming water-insoluble dendritic fiber crystallisates), and expands water in a concrete structure, so that the pores and cracks in the structure are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is also improved.
3. The addition of the medical stone composite water-absorbent resin can improve the flexibility of a cement base, and the medical stone composite water-absorbent resin has excellent water retention performance and saline water absorption performance, so that the medical stone composite water-absorbent resin can gradually release water after water in the cement base is evaporated, so that the cement base is prevented from plastically shrinking to form cracks due to water evaporation, and the effect of preventing the cement base from cracking is achieved.
4. The water-absorbing resin is added into the waterproof coating after being modified by the medical stone, so that the compressive strength of the coating is not reduced, the tensile strength of the coating can be improved, the cement-based coating has good flexibility, and the problems of poor compactness and strong rigidity and easiness in cracking of the concrete waterproof coating are solved.
Drawings
Fig. 1 shows the water-repellent paint obtained in example 6 and water in a ratio of 1: 0.5 stirring, coating on a 60X 40X 3mm glass plate, and placing in an incubator.
FIG. 2 is a sample diagram of the sample of FIG. 1 after being placed in the incubator 72 h.
Fig. 3 shows the water-repellent paint obtained in comparative example 1 and water in a ratio of 1: 0.5 stirring, coating on a 60X 40X 3mm glass plate, and placing in an incubator.
FIG. 4 is a sample diagram of the sample of FIG. 3 after being placed in the incubator 72 h.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 3 parts of medical stone composite super absorbent resin, 5 parts of crystallization activator (ethylenediamine-di-o-phenyl-acetic acid sodium), 30 parts of portland cement, 15 parts of quartz sand, 10 parts of inorganic filler and 2 parts of powdery polycarboxylic acid high-efficiency water reducing agent (powdery polycarboxylic acid high-efficiency water reducing agent M13 purchased from Henan Maxam chemical Co., Ltd.);
the medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 3 parts of acrylic acid (the neutralization degree is 60%), 10 parts of water, 2 parts of medical stone, 0.5 part of ammonium persulfate and 0.5 part of N, N' -methylene-bisacrylamide;
The inorganic filler comprises the following components in parts by weight: 0.8 part of aluminum hydroxide, 0.3 part of zinc oxide, 0.3 part of lithium chromate and 1.2 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 65 ℃, carrying out polymerization reaction for 8 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 60min at the speed of 45r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
Example 2
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 8 parts of medical stone composite super absorbent resin, 10 parts of crystallization activator (sodium hydroxyethylidene diphosphate), 50 parts of portland cement, 30 parts of quartz sand, 25 parts of inorganic filler and 6 parts of powdery polycarboxylic acid high-efficiency water reducing agent (powdery polycarboxylic acid high-efficiency water reducing agent M13 purchased from Henan Mekenem chemical Co., Ltd.);
The medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 8 parts of acrylic acid (the neutralization degree is 60%), 20 parts of water, 6 parts of medical stone, 1 part of ammonium persulfate and 1 part of N, N' -methylene-bisacrylamide;
the inorganic filler comprises the following components in parts by weight: 1.2 parts of aluminum hydroxide, 0.6 part of zinc oxide, 0.6 part of lithium chromate and 1.5 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 75 ℃, carrying out polymerization reaction for 5 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 30min at the speed of 65r/min in the ball mill, and standing for 8min to obtain the permeable crystallization type cement-based waterproof coating.
Example 3
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 4 parts of medical stone composite super absorbent resin, 7 parts of crystallization activator (ethylene diamine tetraacetic acid sodium phosphate), 35 parts of portland cement, 20 parts of quartz sand, 15 parts of inorganic filler and 3 parts of powdery polycarboxylic acid high-efficiency water reducing agent (powdery polycarboxylic acid high-efficiency water reducing agent M13 purchased from Henan Mekenum chemical Co., Ltd.);
The medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 4 parts of acrylic acid (the neutralization degree is 60%), 12 parts of water, 4 parts of medical stone, 0.7 part of ammonium persulfate and 0.7 part of N, N' -methylene-bisacrylamide;
the inorganic filler comprises the following components in parts by weight: 0.9 part of aluminum hydroxide, 0.4 part of zinc oxide, 0.4 part of lithium chromate and 1.3 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 70 ℃, carrying out polymerization reaction for 7 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 50r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
Example 4
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 6 parts of medical stone composite super absorbent resin, 9 parts of crystallization activator (ethylenediamine-di-o-phenyl-sodium acetate), 45 parts of portland cement, 25 parts of quartz sand, 20 parts of inorganic filler and 6 parts of powdery polycarboxylic acid high-efficiency water reducer (powdery polycarboxylic acid high-efficiency water reducer M13 purchased from Henan Maxam chemical Co., Ltd.);
The medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 6 parts of acrylic acid (the neutralization degree is 60%), 15 parts of water, 5 parts of medical stone, 0.7 part of ammonium persulfate and 0.8 part of N, N' -methylene-bisacrylamide;
the inorganic filler comprises the following components in parts by weight: 1.0 part of aluminum hydroxide, 0.5 part of zinc oxide, 0.5 part of lithium chromate and 1.4 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 70 ℃, carrying out polymerization reaction for 6 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 55r/min in the ball mill, and standing for 6min to obtain the permeable crystallization type cement-based waterproof coating.
Example 5
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 6 parts of medical stone composite super absorbent resin, 38 parts of crystallization activating agents (ethylenediamine-di-o-phenyl sodium acetate, sodium gluconate, hydroxyethylidene sodium diphosphate and ethylenediamine-tetra-subunit sodium phosphate), 40 parts of portland cement, 23 parts of quartz sand, 17 parts of inorganic filler and 5 parts of powdery polycarboxylic acid high-efficiency water reducing agent (powdery polycarboxylic acid high-efficiency water reducing agent M13 purchased from Henan Maxam chemical Co., Ltd.);
The medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 4 parts of acrylic acid (the neutralization degree is 60%), 16 parts of water, 5 parts of medical stone, 0.8 part of ammonium persulfate and 0.7 part of N, N' -methylene-bisacrylamide;
the inorganic filler comprises the following components in parts by weight: 1.1 parts of aluminum hydroxide, 0.5 part of zinc oxide, 0.4 part of lithium chromate and 1.3 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 70 ℃, carrying out polymerization reaction for 6 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 60r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
Example 6
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 5 parts of medical stone composite super absorbent resin, 8 parts of crystallization activator (ethylenediamine-di-o-phenyl-sodium acetate), 39 parts of portland cement, 22 parts of quartz sand, 17 parts of inorganic filler and 4 parts of powdery polycarboxylic acid high-efficiency water reducer (powdery polycarboxylic acid high-efficiency water reducer M13 purchased from Henan Maken chemical Co., Ltd.);
The medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 6 parts of acrylic acid (the neutralization degree is 60%), 16 parts of water, 4 parts of medical stone, 0.7 part of ammonium persulfate and 0.8 part of N, N' -methylene-bisacrylamide;
the inorganic filler comprises the following components in parts by weight: 1.0 part of aluminum hydroxide, 0.4 part of zinc oxide, 0.5 part of lithium chromate and 1.3 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 70 ℃, carrying out polymerization reaction for 7 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 60r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
Comparative example 1
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 8 parts of a crystallization activator (ethylenediamine-di-o-phenyl-acetic acid sodium), 39 parts of portland cement, 22 parts of quartz sand, 17 parts of an inorganic filler, and 4 parts of a powdery polycarboxylic acid high-efficiency water reducing agent (a powdery polycarboxylic acid high-efficiency water reducing agent M13 available from Henan Mekenem chemical Co., Ltd.);
The inorganic filler comprises the following components in parts by weight: 1.0 part of aluminum hydroxide, 0.4 part of zinc oxide, 0.5 part of lithium chromate and 1.3 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps: adding a crystallization activator, portland cement, quartz sand, an inorganic filler and a water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 60r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
The difference between the comparative example 1 and the example 6 is that the medical stone composite water-absorbent resin is not added in the comparative example 1.
Comparative example 2
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 5 parts of medical stone composite super absorbent resin, 8 parts of crystallization activator (ethylenediamine-di-o-phenyl-sodium acetate), 39 parts of portland cement, 22 parts of quartz sand, 17 parts of inorganic filler (aluminum hydroxide), and 4 parts of powdery polycarboxylic acid high-efficiency water reducing agent (powdery polycarboxylic acid high-efficiency water reducing agent M13 purchased from Henan Makenmu chemical Co., Ltd.);
the medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 6 parts of acrylic acid (the neutralization degree is 60%), 16 parts of water, 4 parts of medical stone, 0.7 part of ammonium persulfate and 0.8 part of N, N' -methylene-bisacrylamide.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 70 ℃, carrying out polymerization reaction for 7 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 60r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
Comparative example 2 is different from example 6 in that the inorganic filler of comparative example 2 is only aluminum hydroxide.
Comparative example 3
A permeable crystallization type cement-based waterproof coating comprises the following components in parts by weight: 1 part of medical stone composite super absorbent resin, 8 parts of crystallization activator (ethylenediamine-di-o-phenyl-sodium acetate), 39 parts of portland cement, 22 parts of quartz sand, 17 parts of inorganic filler and 4 parts of powdery polycarboxylic acid high-efficiency water reducer (powdery polycarboxylic acid high-efficiency water reducer M13 purchased from Henan Maken chemical Co., Ltd.);
The medical stone composite super absorbent resin comprises the following raw materials in parts by weight: 6 parts of acrylic acid (the neutralization degree is 60%), 16 parts of water, 4 parts of medical stone, 0.7 part of ammonium persulfate and 0.8 part of N, N' -methylene-bisacrylamide;
the inorganic filler comprises the following components in parts by weight: 1.0 part of aluminum hydroxide, 0.4 part of zinc oxide, 0.5 part of lithium chromate and 1.3 parts of sodium-based nano bentonite.
The preparation method of the permeable crystallization type cement-based waterproof coating comprises the following steps:
step one, adding acrylic acid into water according to the weight part ratio, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 70 ℃, carrying out polymerization reaction for 7 hours, and drying to obtain the medical stone composite super absorbent resin;
and step two, adding the medical stone composite super absorbent resin, the crystallization activator, the portland cement, the quartz sand, the inorganic filler and the water reducing agent into a ball mill according to the weight part ratio, grinding for 45min at the speed of 60r/min in the ball mill, and standing for 5min to obtain the permeable crystallization type cement-based waterproof coating.
The difference between the comparative example 3 and the example 6 is that the content of the medical stone composite super absorbent resin in the comparative example 3 is lower.
The performance tests of examples 1 to 6 and comparative examples 1 to 3 are carried out, and the test is carried out by referring to GB 18445-:
table form
From table 1, it can be derived:
the construction performance, appearance and the like of the comparative example 1 are not affected, but the drying speed of the crystallization activator is high because the medical stone composite water-absorbent resin is not added in the comparative example 1, so that the crystallization activator does not permeate into capillary pores of concrete, and the compactness of the concrete is low, and the waterproof performance is poor.
The workability, appearance and the like in comparative example 2 were not affected, but the inorganic filler had a certain effect on the water resistance without adding a substance for enhancing the folding and compression resistance of the waterproof coating.
The construction performance, appearance and the like in the comparative example 3 are not affected, but the content of the medical stone composite super absorbent resin is lower, so that the influence of the medical stone composite super absorbent resin on the whole waterproof coating is weakened.
In the waterproof coatings of embodiments 1 to 6, after construction, the maifanite composite water-absorbent resin is subjected to a water retention-release process, so that the hydrated crystal activator is ensured to continuously permeate into concrete pores, and reacts and crystallize in the concrete pores (to form water-insoluble dendritic fiber crystals), so that water expands in a concrete structure, the pores and cracks in the structure are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is also improved.
The waterproof coatings of example 6 and comparative example 1 were subjected to the following tests:
the test method comprises the following steps: the waterproof coatings obtained in example 6 and comparative example 1 were added with water (the ratio of waterproof coating to water was 1: 0.5), stirred, coated on glass plates of 60X 40X 3mm, and then placed in an incubator at a constant temperature of 40 ℃ to observe whether the coating cracked every 24 hours. FIG. 1 is a photograph showing the example 6 when it is not set in the incubator, and FIG. 2 is a photograph showing the example after it is set in the incubator 72 h; FIG. 3 is a photograph showing comparative example 1 when it is not set in the incubator, and FIG. 4 is a photograph showing comparative example after it is set in the incubator 72 h. As can be seen from FIGS. 1 to 4, the coating in example 6 did not crack after being dried in an incubator for 72 hours; the coating of comparative example 1, on the other hand, exhibited cracking after 72 hours of oven drying. Therefore, the cement-based flexibility can be improved and the cement-based cracking can be prevented by adding the medical stone composite water-absorbent resin, the water-absorbent resin is added into the waterproof coating after being modified by the medical stone, the compressive strength of the coating cannot be reduced, the tensile strength of the coating can be improved, the cement-based coating has good flexibility, and the problems of poor compactness and strong rigidity and easiness in cracking of the concrete waterproof coating are solved.
In conclusion, the permeable crystallization type cement-based waterproof coating disclosed by the invention can be added with the medical stone composite water-absorbent resin to increase the water retention of the coating, so that the cement hydration and the sustainable permeation of the crystallization activator can be ensured. After construction, the medical stone composite water-absorbing resin continuously permeates into concrete capillary pores after the hydration of the crystallization activating agent is ensured through the water retention-release process, reacts and crystallizes in the concrete capillary pores, so that the capillary pores are blocked, the compactness of the concrete is improved, and the waterproof performance of the concrete is improved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. The permeable crystallization type cement-based waterproof coating is characterized by comprising the following components in parts by weight: 3-8 parts of medical stone composite super absorbent resin, 5-10 parts of crystallization activator, 30-50 parts of portland cement, 15-30 parts of quartz sand and 10-25 parts of inorganic filler; the medical stone composite super absorbent resin is prepared from the following raw materials in parts by weight: 3-8 parts of acrylic acid, 10-20 parts of water, 2-6 parts of medical stone, 0.5-1 part of ammonium persulfate and 0.5-1 part of N, N' -methylene bisacrylamide; the specific preparation process of the medical stone composite super absorbent resin comprises the following steps: according to the weight ratio of the components, adding acrylic acid into water, stirring, adding medical stone, ammonium persulfate and N, N' -methylene bisacrylamide, stirring at a constant temperature of 65-75 ℃, carrying out polymerization reaction for 5-8 hours, and drying to obtain the medical stone composite super absorbent resin.
2. The permeable crystalline cement-based waterproof coating material as claimed in claim 1, wherein: the crystallization activator is at least one of ethylenediamine di-o-phenyl acetate, gluconate, hydroxyethylidene diphosphate and ethylenediamine tetramethylene phosphate.
3. The permeable crystalline cement-based waterproof coating material as claimed in claim 1, wherein: the inorganic filler comprises the following components in parts by weight: 0.8-1.2 parts of aluminum hydroxide, 0.3-0.6 part of zinc oxide, 0.3-0.6 part of lithium chromate and 1.2-1.5 parts of sodium-based nano bentonite.
4. A method for preparing a permeable crystalline cement-based waterproofing paint according to any one of claims 1 to 3, comprising: the medical stone composite super absorbent resin, the crystallization activator, the silicate cement, the quartz sand and the inorganic filler are ground and dispersed uniformly according to the weight part ratio to obtain the permeable crystallization type cement-based waterproof coating.
5. The preparation method of the permeable crystalline cement-based waterproof coating as claimed in claim 4, wherein the grinding and dispersing process comprises: grinding the mixture in a ball mill at a speed of 45-65 r/min for 30-60 min, and standing for 3-8 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830728A (en) * | 2021-01-13 | 2021-05-25 | 广东龙湖科技股份有限公司 | Self-maintenance permeable crystallization material for secondary grouting of shield, preparation method and application |
| CN113429176A (en) * | 2021-07-13 | 2021-09-24 | 长江水利委员会长江科学院 | Cement-based waterproof material based on osmotic crystallization principle |
-
2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830728A (en) * | 2021-01-13 | 2021-05-25 | 广东龙湖科技股份有限公司 | Self-maintenance permeable crystallization material for secondary grouting of shield, preparation method and application |
| CN113429176A (en) * | 2021-07-13 | 2021-09-24 | 长江水利委员会长江科学院 | Cement-based waterproof material based on osmotic crystallization principle |
| CN113429176B (en) * | 2021-07-13 | 2022-09-09 | 长江水利委员会长江科学院 | Cement-based waterproof material based on osmotic crystallization principle |
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