CN112029344A - Polymer cement-based coating with good compatibility and preparation method and application thereof - Google Patents
Polymer cement-based coating with good compatibility and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
- C09D143/04—Homopolymers or copolymers of monomers containing silicon
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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Abstract
The invention relates to the technical field of polymer cement-based coatings, in particular to a polymer cement-based coating with good compatibility, and a preparation method and application thereof. The coating comprises the following raw materials in parts by weight: 45-55 parts of polymer emulsion, 15-20 parts of cement, 0.2-0.5 part of alcohol, 15-18 parts of filler, 10-13 parts of mica powder, 0.25-0.88 part of additive and 10-15 parts of water. The modification target of the invention is cement, and then the polar group on the surface of the alcohol compatibilizer is utilized to make the alcohol compatibilizer adsorb on the surface of cement particles through physical or weak chemical action, so that a layer of water solvation film is covered on the surface of the cement particles, the particle steric hindrance between emulsion particles and cement is reduced, the release of cement calcium ions is slowed down, the damage effect of the cement on the emulsion in the early stage is small, emulsion colloidal particles are protected from being damaged, and the compatibility of polymer emulsion and the cement is improved.
Description
Technical Field
The invention relates to the technical field of polymer cement-based coatings, in particular to a technical scheme capable of effectively improving the compatibility of a polymer cement-based coating.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The polymer emulsion is a complex system with multiple phases coexisting, is in a metastable state under thermodynamics and is very easily influenced by external factors. In a polymer cement-based coating system, early hydration of cement absorbs water, and a large amount of electrolyte ions are generated in the system, so that the system is in an alkaline environment, the emulsion breaking and flocculation problems of the emulsion are easily caused, the application performance of the emulsion is restricted, and the emulsion cannot be well compatible with the cement, so that the emulsion and the cement cannot form a uniform material.
At present, the method for improving the compatibility of the polymer cement-based coating mainly comprises the addition of an emulsifier, and the commonly used emulsifier is roughly divided into a nonionic emulsifier and an anionic emulsifier, wherein the nonionic emulsifier mainly forms a hydration film on the surface of monomer particles, and the mutual contact between the particles is prevented by utilizing the steric hindrance effect, so that the monomer particles are stable; the latter is to form a negative electric layer on the monomer surface, the negative electric layer attracts positrons in liquid phase to form a stable double electric layer, and particles repel each other to achieve stability.
However, calcium ions released by hydration of cement increase the concentration of cations in the electric double layer in an emulsion using an anionic emulsifier, which substantially increases the cations entering the compact layer, while the cations in the dispersed layer decrease, and further, the electric double layer is compressed, the Zeta potential decreases, the potential energy barrier decreases, and particles are easily coagulated, thereby breaking the emulsion. In the emulsion using the non-ionic emulsifier, the calcium ions can damage the surface hydration film due to the salting-out effect of the metal cations, so that the emulsion is damaged. Meanwhile, the emulsifier has certain toxic action on human bodies and certain pollution on the environment.
Disclosure of Invention
Aiming at the defects, the invention aims to provide the polymer cement-based coating with good compatibility as well as the preparation method and the application thereof. In order to achieve the above object, the technical solution of the present invention is specifically as follows:
in a first aspect of the present invention, a polymer cement-based coating with good compatibility is provided, wherein the raw material composition of the coating comprises the following components by weight: 45-55 parts of polymer emulsion, 15-20 parts of cement, 0.2-0.5 part of alcohol, 15-18 parts of filler, 10-13 parts of mica powder, 0.25-0.88 part of additive and 10-15 parts of water.
Further, the polymer emulsion includes any one of a pure acrylic emulsion (polymerized entirely by an acrylic monomer), a styrene-acrylic emulsion (polymerized by a styrene monomer and an acrylic monomer), a silicone-acrylic emulsion (polymerized by a silicone monomer and an acrylic monomer), a fluorine-acrylic emulsion (polymerized by a fluorine monomer and an acrylic monomer), and the like. Optionally, the polymer emulsion has a solids content of 45-55%.
Further, the cement includes any one of ordinary portland cement, sulphoaluminate cement, white portland cement, and the like.
Further, the alcohol includes at least one of polyvinyl alcohol, sorbitol, mannitol, and galactitol. In the present invention, the above alcohols are used as the compatibilizer, and the mechanism of action is: because the polar group (hydroxyl) of the alcohol substance has strong polarity, the alcohol substance can be adsorbed on the surfaces of cement hydration product particles and emulsion particles through the hydroxyl group to be used as a bridge, one end of the hydroxyl group is combined with water molecules, and the other end of the hydroxyl group is combined with the surfaces of the cement hydration product or the emulsion particles, so that a layer of solvation water film is covered on the alcohol substance, the particle steric hindrance between the emulsion particles and cement is reduced, the release of cement calcium ions is slowed down, and the compatibility of the emulsion and the cement is improved.
Further, the filler comprises any one or more of light calcium carbonate, talcum powder, silicon dioxide, heavy calcium, fly ash, metakaolin and the like; optionally, the fineness of the filler is 150-250 meshes. Wherein, the light calcium carbonate has the characteristics of small particle size, fine particles and good suspension property, and the heavy calcium carbonate has low cost. The talcum powder can improve the precipitability of the coating, and improve the mechanical force and water resistance of the coating. The quartz powder has good suspension property and thickening capability, and is beneficial to improving the durability of the coating. The fly ash is low in cost and is beneficial to improving the grindability of the coating. The metakaolin has good suspension property and is easy to disperse, and a coating film can be endowed with good leveling property.
Furthermore, the mica powder has a unique sheet structure, so that cracks are prevented from being generated, and the durability of the coating is improved.
Further, the additive comprises at least one of a dispersant, a film-forming aid, a defoaming agent and the like, and optionally, 0.05 to 0.08 part of the dispersant, 0.1 to 0.3 part of the film-forming aid and 0.1 to 0.5 part of the defoaming agent.
Further, the dispersant may be selected from sodium hexametaphosphate and the like. The film-forming assistant can be ester alcohol film-forming assistant and the like. The defoaming agent can be selected from organosilicon defoaming agents and the like.
In a second aspect of the present invention, there is provided a method for preparing the compatibility of the polymer cement-based paint, comprising the steps of:
(1) mixing the cement, the filler and the mica powder in proportion and then uniformly stirring to obtain mixed powder.
(2) And (2) uniformly mixing the polymer emulsion and water, then adding the alcohol compatibilizer and the additive, uniformly stirring, then adding the mixed powder obtained in the step (1), uniformly stirring, and standing to obtain the emulsion.
Further, in the step (1), the stirring time is 20-30min, so that the solid raw materials are fully and uniformly mixed, and the influence on the performance of the coating due to uneven dispersion of the solid raw materials in the coating is avoided.
Further, in the step (2), the polymer emulsion and the water are mixed by stirring, optionally, the stirring time is 2-3min, and the polymer emulsion and the water are premixed to uniformly disperse the emulsion in the water.
Further, in the step (2), firstly, the dispersant in the admixture is added to fully disperse the compatibilizer in the emulsion, and then the defoaming agent and the film-forming assistant in the admixture are added.
In a third aspect of the present invention, there is provided the use of the polymer cement-based coating with good compatibility in the field of construction engineering, for example, for waterproofing of buildings, structures, tunnels, bridges, kitchens, bathrooms, and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method is different from the conventional method for modifying the polymer emulsion, the modified target of the method is cement, and further, the method utilizes the polar group on the surface of the alcohol compatibilizer to enable the alcohol compatibilizer to be adsorbed on the surface of cement particles through physical or weak chemical action, so that a layer of water solvation film is covered on the surface of the cement particles, the particle steric hindrance between emulsion particles and cement is reduced, the release of cement calcium ions is slowed down, and the compatibility of the emulsion and the cement is improved.
(2) The addition of the alcohol compatibilizer of the invention has no significant negative effect on the Zeta potential of the emulsion (reduces the Zeta potential of the emulsion). Compared with the traditional mode of adding the emulsifier, the consumption of the alcohol compatibilizer is greatly reduced (the consumption of the traditional emulsifier is 4 percent of the mass of the coating, but the consumption of the alcohol compatibilizer is only 0.52 percent at most), the generation cost of the coating is saved, and the coating is non-toxic and harmless to a human body, environment-friendly and simple in preparation process.
(3) Due to the addition of the compatibilizer, the destructive capacity of calcium ions released in the early stage of cement on the emulsion is weakened, so that emulsion particles can be tightly combined with cement particles, and the internal combination is compact, therefore, the alcohol compatibilizer also effectively improves the tensile strength and the film forming property of the polymer cement-based coating.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a Scanning Electron Microscope (SEM) image of a coating prepared according to a first embodiment of the invention.
Fig. 2 is a Scanning Electron Microscope (SEM) image of the coating material prepared in the first experimental example of the present invention.
FIG. 3 is a diagram showing the effect of demulsification and flocculation of an emulsion in a second experimental example of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
Further, as previously mentioned, current approaches to improving compatibility of polymer cement-based coatings are primarily the addition of emulsifiers. However, calcium ions released by hydration of cement increase the concentration of cations in the electric double layer in an emulsion using an anionic emulsifier, which substantially increases the cations entering the compact layer, while the cations in the dispersed layer decrease, and further, the electric double layer is compressed, the Zeta potential decreases, the potential energy barrier decreases, and particles are easily coagulated, thereby breaking the emulsion. In the emulsion using the nonionic emulsifier, the calcium ions can damage the surface hydration film due to the salting-out action of the metal cations, so that the emulsion is damaged. Therefore, the invention provides a technical scheme capable of effectively improving the compatibility of the polymer cement-based coating, and the technical scheme is further explained by combining the drawings and the specific embodiments in the specification.
First embodiment
A preparation method of a polymer cement-based coating comprises the following steps:
(1) homogenizing powder: 18 parts of Portland cement, 15 parts of light calcium carbonate powder (with the fineness of 150-180 meshes) and 12 parts of mica powder are placed in a stirrer to be stirred for 30min, so as to obtain mixed powder.
(2) Preparing the coating: weighing 48 parts by weight of styrene-acrylic emulsion and 13 parts by weight of deionized water, pre-stirring the two materials in a stirrer for 3min, then sequentially adding 0.2 part by weight of sorbitol and 0.05 part by weight of sodium hexametaphosphate, slowly stirring (400rpm) for 5min to fully disperse the compatibilizer in the emulsion, finally adding 0.3 part by weight of silicone defoamer and 0.3 part by weight of ester alcohol film-forming assistant, and continuously stirring slowly (400rpm) for 2min to obtain the base coating.
(3) And (3) adding the uniformly mixed powder obtained in the step (1) into the basic coating obtained in the step (2), stirring for 10min, and finally standing for 6min until bubbles disappear, thus obtaining the polymer cement-based coating.
Second embodiment
A preparation method of a polymer cement-based coating comprises the following steps:
(1) homogenizing powder: 15 parts by weight of sulphoaluminate cement, 18 parts by weight of silicon dioxide powder (fineness of 150-.
(2) Preparing the coating: weighing 45 parts by weight of silicone-acrylic emulsion and 14 parts by weight of deionized water, pre-stirring the two materials in a stirrer for 2min, then sequentially adding 0.3 part by weight of polyvinyl alcohol and 0.06 part by weight of sodium hexametaphosphate, slowly stirring (450rpm) for 3min to fully disperse the compatibilizer in the emulsion, finally adding 0.1 part by weight of silicone defoaming agent and 0.2 part by weight of ester alcohol film-forming assistant, and continuously stirring slowly (450rpm) for 2min to obtain the base coating.
(3) And (3) adding the uniformly mixed powder obtained in the step (1) into the basic coating obtained in the step (2), stirring for 10min, and finally standing for 5min until bubbles disappear, thus obtaining the polymer cement-based coating.
Third embodiment
A preparation method of a polymer cement-based coating comprises the following steps:
(1) homogenizing powder: 20 parts by weight of white Portland cement, 16 parts by weight of talcum powder (with the fineness of 210-.
(2) Preparing the coating: weighing 55 parts by weight of fluoropropane emulsion and 15 parts by weight of deionized water, pre-stirring the two materials in a stirrer for 3min, then sequentially adding 0.4 part by weight of mannitol and 0.08 part by weight of sodium hexametaphosphate, slowly stirring (500rpm) for 5min to fully disperse the compatibilizer in the emulsion, finally adding 0.5 part by weight of silicone defoaming agent and 0.1 part by weight of ester alcohol film-forming assistant, and continuously slowly stirring (500rpm) for 2min to obtain the base coating.
(3) And (3) adding the uniformly mixed powder obtained in the step (1) into the basic coating obtained in the step (2), stirring for 12min, and standing for 7min until bubbles disappear to obtain the polymer cement-based coating.
Fourth embodiment
A preparation method of a polymer cement-based coating comprises the following steps:
(1) homogenizing powder: placing 16 parts by weight of ordinary portland cement, 16 parts by weight of metakaolin (with the fineness of 170-.
(2) Preparing the coating: weighing 50 parts by weight of silicone-acrylic emulsion and 10 parts by weight of deionized water, pre-stirring the two materials in a stirrer for 3min, then sequentially adding 0.5 part by weight of galactitol and 0.08 part by weight of sodium hexametaphosphate, slowly stirring (500rpm) for 3min to fully disperse the compatibilizer in the emulsion, finally adding 0.4 part by weight of silicone defoamer and 0.2 part by weight of ester alcohol film-forming assistant, and continuously stirring slowly (500rpm) for 2min to obtain the base coating.
(3) And (3) adding the uniformly mixed powder obtained in the step (1) into the basic coating obtained in the step (2), stirring for 12min, and standing for 7min until bubbles disappear to obtain the polymer cement-based coating.
First test example
A preparation method of a polymer cement-based coating comprises the following steps:
(1) homogenizing powder: 18 parts of Portland cement, 15 parts of light calcium carbonate powder (with the fineness of 150-180 meshes) and 12 parts of mica powder are placed in a stirrer to be stirred for 30min, so as to obtain mixed powder.
(2) Preparing the coating: weighing 48 parts by weight of styrene-acrylic emulsion and 13 parts by weight of deionized water, pre-stirring the two materials in a stirrer for 3min, then adding 0.05 part by weight of sodium hexametaphosphate, slowly stirring (400rpm) for 5min, finally adding 0.3 part by weight of silicone defoaming agent and 0.3 part by weight of ester alcohol film-forming assistant, and continuously stirring slowly (400rpm) for 2min to obtain the base coating.
(3) And (3) adding the uniformly mixed powder obtained in the step (1) into the basic coating obtained in the step (2), stirring for 10min, and finally standing for 6min until bubbles disappear, thus obtaining the polymer cement-based coating.
Second test example
The calcium ion stability of the styrene-acrylic emulsion is researched on the basis of the commercially available styrene-acrylic emulsion, and the specific operation is as follows: a certain amount of the emulsion is weighed, a certain amount of calcium chloride solution is added, whether demulsification and flocculation exist is observed, and the effect is shown in figure 3.
Performance testing
(1) The microscopic morphologies of the polymer cement-based paint prepared in the first example and the first test example were observed by Scanning Electron Microscopy (SEM), and the results are shown in fig. 1 and 2, respectively. As can be seen from fig. 2: in the microstructure of the coating without the compatibilizer, a naked cement particle phase can be observed, and the polymer cannot completely wrap the cement particle phase. As can be seen from fig. 1: after the compatibilizer is added, the paint has an obvious polymer film structure and has no obvious defect, because the alcohol compatibilizer has the function of delaying cement hydration and forms a hydration film on the surface of cement particles, so that the sulphoaluminate cement has little damage effect on emulsion in the early stage, the emulsion particles naturally lose water and are cemented with the cement particles, and the film structure is complete.
(2) FIG. 3 is a diagram showing the effect of emulsion breaking and flocculation in the second experimental example of the present invention, and it can be seen from the diagram that the emulsion breaking and flocculation occurs when the compatibility of the polymer cement-based coating is improved by adding the conventional emulsifier, but the emulsion breaking and flocculation does not occur in the embodiment of the present invention.
(3) Table 1 shows the results of the Zeta potential of the emulsion obtained by the four groups of examples and blank groups according to the invention.
TABLE 1
In table 1, the blank is an emulsion without the addition of the alcoholic compatibilizer in the corresponding example, and it can be seen from the table that: the Zeta potential of the emulsion of the embodiment added with the alcohol compatibilizer is increased to different degrees because the Zeta potential is easy to form a hydrogen bond with water molecules through hydroxyl groups, and the hydrogen bond association between the water molecules enables the surface of emulsion particles to form a stable water film to prevent the contact between the particles.
(4) Table 2 shows the results of the effects of the first to fourth examples and the blank set of the present invention on the tensile strength of the coating material.
TABLE 2
In table 2, the blank is an emulsion without compatibilizer, as can be seen from the table: the alcohol-based compatibilizer can also enhance the tensile strength of the coating due to the addition of the alcohol-based compatibilizer: the destructive capacity of calcium ions released in the early stage of cement on the emulsion is weakened, so that emulsion particles can be tightly combined with cement particles, and the internal combination is compact; therefore, the tensile strength of the coating is improved along with the addition of the alcohol compatibilizer. In addition, as can also be seen from the test data in Table 2, the tensile strength has a tendency to increase first and then to be gentle, and when it reaches 0.5 parts by weight, the strength change becomes substantially flat. Therefore, it is generally recommended that the maximum addition amount of the compatibilizer is 0.5 parts by weight.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The polymer cement-based coating comprises the following raw materials in parts by weight:
2. the polymer cement-based coating according to claim 1, characterized in that: the polymer emulsion comprises any one of pure acrylic emulsion, styrene-acrylic emulsion, silicone acrylic emulsion and fluorine acrylic emulsion; preferably, the polymer emulsion has a solids content of 45-55%.
3. The polymer cement-based coating according to claim 1, characterized in that: the cement comprises any one of ordinary portland cement, sulphoaluminate cement and white portland cement.
4. The polymer cement-based coating according to claim 1, characterized in that: the filler comprises any one or more of light calcium carbonate, talcum powder, silicon dioxide, heavy calcium, fly ash and metakaolin; preferably, the fineness of the filler is 150-250 meshes.
5. The polymer cement-based coating according to claim 1, characterized in that: the additive comprises at least one of a dispersant, a film-forming assistant and a defoaming agent;
preferably, the dispersant is 0.05-0.08 part;
preferably, the film-forming assistant is 0.1-0.3 part;
preferably, the defoaming agent is 0.1 to 0.5 parts.
6. The polymer cement-based coating according to claim 5, characterized in that: the dispersant is sodium hexametaphosphate;
or the film-forming assistant is an ester alcohol film-forming assistant;
or the defoaming agent is a silicone defoaming agent.
7. The polymer cement-based coating according to any one of claims 1 to 6, characterized in that: the alcohol comprises at least one of polyvinyl alcohol, sorbitol, mannitol and galactitol.
8. The method of any one of claims 1 to 7, comprising the steps of:
(1) mixing cement, filler and mica powder in proportion and then uniformly stirring to obtain mixed powder;
(2) and (2) uniformly mixing the polymer emulsion and water, then adding the alcohol compatibilizer and the additive, uniformly stirring, then adding the mixed powder obtained in the step (1), uniformly stirring, and standing to obtain the emulsion.
9. The method for preparing the polymer cement-based paint compatibility according to the claim 8, wherein in the step (1), the stirring time is 20-30 min;
or, in the step (2), the mixing manner of the polymer emulsion and the water is stirring, and preferably, the stirring time is 2-3 min;
or in the step (2), firstly adding the dispersant in the additive, and then adding the defoaming agent and the film-forming assistant in the additive.
10. Use of a polymer cement-based coating according to any one of claims 1-7 and/or a polymer cement-based coating prepared according to the method of claim 8 or 9 in the field of construction engineering, preferably for waterproofing at least one of buildings, structures, tunnels, bridges, kitchens, bathrooms.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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