CN113088143A - High-density low-water-permeability water-based outer wall polymer coating material and preparation method thereof - Google Patents
High-density low-water-permeability water-based outer wall polymer coating material and preparation method 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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- 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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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Abstract
The high-density low-water-permeability water-based exterior wall polymer coating material is a formula of a small-particle-size ultrahigh-Tg emulsion, a special dispersing agent is a mixture of anionic polycarboxylate ammonium salt, fine-particle-size sericite powder, emulsifying wax and an organic silicon hydrophobic auxiliary agent, and the water permeability resistance of a paint film is improved mainly from the aspects of compactness and hydrophobicity of the paint film. Compared with the conventional formula, the formula disclosed by the invention has the advantages of excellent water permeability resistance, excellent scrubbing resistance and the like, has a good wall surface protection function, and meets higher requirements of consumers.
Description
Technical Field
The invention belongs to the field of coating properties, and particularly relates to a high-density low-water-permeability water-based outer wall polymer coating material.
Background
With the increasing demands of consumers on functionality and decorativeness of coatings, most of the conventional coatings have been far from meeting the demands of consumers. The external wall coating of building, the function mainly has two: decorative functions and protective functions. The protective function refers to that the coating film of the coating has the function of resisting the erosion of rain, snow, ultraviolet rays, acid rain, dust and the like to the outer wall and the wall surface, and one of the protective functions has the main function of preventing water from penetrating through the coating layer and entering the wall surface substrate and preventing the water from causing harm to the wall structure and the heat insulation system of the outer wall of the building, so the impermeability of the coating film of the coating becomes one of the main performances.
If external water leaks into the wall surface, water in pores and cracks of the wall surface can be frozen when meeting a severe cold climate environment, the volume of the water can expand by 9 percent, and the material is extruded, so that the phenomena of corrosion and peeling of the weak part are generated. If the building structure is reinforced concrete, the water intrusion causes the reinforcing steel bars to be corroded, and the section is reduced. The corrosion body volume of the steel bar can expand by 1-4 times, so that tiny cracks in the concrete are expanded, and the protective layer can be seriously cracked. These can seriously affect the integrity, durability and safety of the building structure. For an external thermal insulation system of an external wall, the heat conductivity coefficient of the thermal insulation material can be improved due to the invasion of moisture, and the thermal insulation effect is reduced. Therefore, the water permeability resistance of the coating film of the exterior wall coating is improved, and the coating film is one of the main performances of high-quality exterior wall coatings.
Disclosure of Invention
The more compact the coating film is, the smaller the microscopic pores are, the lower the water permeability of the coating film is, and if the coating film does not have any pores which can be penetrated by water, water cannot penetrate through the coating film to enter a wall body.
In order to solve the problems, the invention is realized by the following technical scheme:
the high-density low-water-permeability water-based outer wall polymer coating material comprises the following components in parts by weight:
the special dispersant is anionic polycarboxylate ammonium salt, and generates a water-insoluble high molecular compound when the coating is dried, so that the coating has better water resistance; meanwhile, due to the special structure, the dispersant has higher dispersing efficiency than the common dispersant.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the mica powder is a composition of two flaky mica powders: a composition prepared from mica powder with the average grain diameter less than or equal to 3um and the average grain diameter between 5 and 8um according to the weight part ratio of 1: 3.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the high-Tg small-particle-size emulsion is a pure acrylic emulsion with ultrahigh glass transition temperature Tg fine particle size used for plastic paint or general industrial paint, the particle size distribution of the emulsion is 10-100 nm, the weight percentage of the solid content is 47.5-48.5%, the glass transition temperature Tg is 55-60 ℃, and the minimum film forming temperature MFFT is 50-55 ℃.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the hydrophobic auxiliary agent is a composition of emulsifying wax and organosilicon hydrophobic auxiliary agent according to the weight part ratio of 5:7, wherein the emulsifying wax in the hydrophobic auxiliary agent is mainly used for generating the surface water droplet effect, but has poor air permeability; the organosilicon hydrophobic auxiliary agent is mainly used for preventing water seepage and water from passing through, and has poor dripping effect and good air permeability. The water repellent and air permeable effects of the two are the best under the proportion. .
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the filler is one or a combination of more of calcined kaolin, talcum powder and calcium carbonate.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the defoaming agent is one or a combination of an organic silicon defoaming agent and a mineral oil defoaming agent; and/or
The wetting agent is nonionic and is one or a combination of more of sugar derivatives, alcohol ether type and phenol ether type; and/or
The cosolvent is a diol cosolvent; and/or
The film-forming auxiliary agent is one or a combination of more of alcohol ester solvents, Texanol and Coasol; and/or
The thickening agent and the rheological agent are respectively and independently selected from one or a combination of more of cellulose thickening agent, alkali swelling thickening agent, polyurethane thickening agent and inorganic thickening agent; and/or
The pH regulator is one or a combination of organic alcamines and organic amines; and/or
The mildew preventive is one or a combination of a plurality of benzimidazole methyl carbamate, 2-n-octyl-4-isothiazoline-3-ketone and butyl carbamate-3-iodo-2-propynyl ester; and/or
The preservative is one or a combination of more of 1, 2-benzisothiazolin-3-one (BIT), 5-chloro-2-methyl-4-isothiazolin-3-one/2-methyl-4-isothiazolin-3-one (CMIT/MIT).
The high-density low-water-permeability water-based exterior wall polymer coating material can be prepared according to conventional conditions or conditions recommended by manufacturers, but better product effects can be obtained by using the preparation method disclosed by the invention for preparation.
The invention also relates to a preparation method of the high-density low-water-permeability water-based exterior wall polymer finishing material, which comprises the following steps:
a. wherein said first mixture is prepared as follows:
preparing by using a dispersion disc, and uniformly mixing the first part of water, the thickening agent, the pH regulator, the defoaming agent, the special dispersing agent, the wetting agent, the mica powder, the pigment, the filler and the second part of water under the stirring condition;
b. wherein said second mixture is prepared as follows:
and (2) preparing by using the same dispersion disc, adding a film forming substance, a cosolvent, a film forming aid, a mildew preventive, a preservative, a rheological agent, a hydrophobic aid and third water into the first mixture, and uniformly mixing to prepare a second mixture, so as to obtain the high-density low-water-permeability water-based exterior wall polymer coating material.
The preparation method of the high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the stirring speed in the preparation process of the first mixture is 200-600 revolutions per minute;
the dispersing and stirring speed in the first mixture preparation process is 1200-1800 rpm;
the stirring speed in the preparation process of the second mixture is 600-1000 revolutions per minute.
The preparation method of the high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the stirring speed in the preparation process of the first mixture is 200-300 r/min;
the dispersing and stirring speed in the first mixture preparation process is 1200-1800 rpm;
the stirring speed in the preparation process of the second mixture is 600-900 revolutions per minute.
The glass transition temperature Tg of the emulsion of the film forming substance used in the conventional formula is between 5 and 40 ℃, the minimum film forming temperature MFFT ranges from 0 to 35 ℃, and the particle size ranges from 150nm to 500 nm; the dispersant in the conventional formula is a common dispersant, and the filler mainly comprises calcium carbonate, talcum powder and the like.
The invention mainly improves the water permeability resistance of the paint film from the aspects of compactness and hydrophobicity of the paint film:
improving the compactness of a paint film: the film forming matter is emulsion with superhigh glass transition temperature Tg of 55-60 deg.c, minimum film forming temperature MFFT of 50-55 deg.c and grain size of 10-100 nm. The powder with different grain diameters is proportioned under the guidance of the powder accumulation principle to reduce the porosity, so that the powder in the paint film is more densely accumulated and less film-forming substances are needed. The extender is prepared from sericite powder with particle size (the ratio of powder of less than 3um to powder of 5 um-8 um is 1:3, the accumulation is more compact), talcum powder and the like, and the mica powder can form a structural cured paint film parallel to the paint film to enable the paint film to be more compact.
Hydrophobicity aspect of the paint film: according to the invention, a special dispersant of the polycarboxylate anionic polymer is selected, and the polycarboxylate anionic polymer dispersant generates a polymer which is difficult to dissolve in water in the coating drying process, so that a paint film has higher water resistance and has higher dispersion efficiency than a common ammonium salt dispersant due to the special structure of the dispersant; the hydrophobic auxiliary agent is emulsified wax and organosilicon hydrophobic auxiliary agent. The emulsifying wax is mainly used for generating a water droplet effect, and the air permeability is poor; the organosilicon hydrophobic auxiliary agent prevents water from permeating, the water drop effect is poor, but the air permeability is good, and the water repellency and the air permeability of the paint film are the best under the selected proportion. The invention relates to a formula of a mixture of a small-particle-size ultrahigh-Tg emulsion, a special dispersant ammonium polycarboxylate anionic polymer, fine-particle-size sericite powder, emulsifying wax and an organic silicon hydrophobic auxiliary agent.
The high-compactness low-water-permeability water-based outer wall polymer coating material adopts the emulsion with a small grain size and ultrahigh glass transition temperature Tg to improve the compactness of a paint film; meanwhile, selecting a fine-particle-size mica powder mixture to form a structure parallel to the surface of the paint film in the curing process of the paint film so as to improve the compactness of the paint film; the powder particle size accumulation principle guides to reduce the powder accumulation porosity so as to reduce the amount of bonding materials required for completely wrapping the powder, emulsifying wax and organic silicon hydrophobic auxiliary agent are selected and mixed according to a certain proportion by utilizing the hydrophobicity of the surface of a paint film, and the water repellency and the air permeability of the paint film are optimal; the special dispersant generates water-insoluble polymers during the drying of the paint film, which is beneficial to improving the water permeability resistance of the paint film. Compared with the conventional formula, the formula disclosed by the invention is excellent in water permeability resistance and scrubbing resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. The simple improvement of the preparation method of the invention on the premise of the conception of the invention belongs to the protection scope of the invention.
Through long-term research, the main performance of the high-density low-water-permeability water-based outer wall polymer coating material completely meets the performance requirement through a sample test.
Example 1: preparation method of high-density low-water-permeability water-based outer wall polymer coating material
The preparation method of the high-density low-water-permeability water-based exterior wall polymer finishing material comprises the following steps of:
a. wherein said first mixture is prepared as follows:
preparing by using a dispersion disc, and uniformly mixing the first part of water, the thickening agent, the pH regulator, the defoaming agent, the special dispersing agent, the wetting agent, the mica powder, the pigment, the filler and the second part of water under the stirring condition;
b. wherein said second mixture is prepared as follows:
and (2) preparing by using the same dispersion disc, adding a film forming substance, a cosolvent, a film forming aid, a mildew preventive, a preservative, a rheological agent, a hydrophobic aid and third water into the first mixture, and uniformly mixing to prepare a second mixture, so as to obtain the high-density low-water-permeability water-based exterior wall polymer coating material.
The preparation method of the high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the stirring speed in the preparation process of the first mixture is 200-600 revolutions per minute;
the dispersing and stirring speed in the first mixture preparation process is 1200-1800 rpm;
the stirring speed in the preparation process of the second mixture is 600-1000 revolutions per minute.
The preparation method of the high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the stirring speed in the preparation process of the first mixture is 200-300 r/min;
the dispersing and stirring speed in the first mixture preparation process is 1200-1800 rpm;
the stirring speed in the preparation process of the second mixture is 600-900 revolutions per minute.
The high-density low-water-permeability water-based outer wall polymer coating material is prepared from the following components in parts by weight in the following table 1:
TABLE 1 composition of high-density low-permeability water-based exterior wall polymer coating material (parts by weight)
The high-density low-water-permeability water-based outer wall polymer coating material disclosed by the invention has the main performance completely meeting the performance requirement through a small sample test.
The special dispersant is anionic polycarboxylate ammonium salt, and generates a water-insoluble high molecular compound when the coating is dried, so that the coating has better water resistance; meanwhile, due to the special structure, the dispersant has higher dispersing efficiency than the common dispersant.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the mica powder is a composition of two flaky mica powders: a composition prepared from mica powder with the average grain diameter less than or equal to 3um and the average grain diameter between 5 and 8um according to the weight ratio of 1: 3.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the high-Tg small-particle-size emulsion is a pure acrylic emulsion with ultrahigh glass transition temperature Tg fine particle size used for plastic paint or general industrial paint, the particle size distribution of the emulsion is 10-100 nm, the weight percentage of the solid content is 47.5-48.5%, the glass transition temperature Tg is 55-60 ℃, and the minimum film forming temperature MFFT is 50-55 ℃.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the hydrophobic auxiliary agent is a composition of emulsifying wax and organosilicon hydrophobic auxiliary agent according to the weight part ratio of 5:7, wherein the emulsifying wax in the hydrophobic auxiliary agent is mainly used for generating the surface water droplet effect, but has poor air permeability; the organosilicon hydrophobic auxiliary agent is mainly used for preventing water seepage and water from passing through, and has poor dripping effect and good air permeability. The water repellent and air permeable effects of the two are the best under the proportion. .
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the filler is one or a combination of more of calcined kaolin, talcum powder and calcium carbonate.
The high-density low-water-permeability water-based outer wall polymer coating material is further optimized as follows:
the defoaming agent is one or a combination of an organic silicon defoaming agent and a mineral oil defoaming agent; and/or
The wetting agent is nonionic and is a sugar derivative, an alcohol ether type, a phenol ether type or a combination thereof; and/or
The cosolvent is a diol cosolvent; and/or
The film-forming auxiliary agent is one or a combination of more of alcohol ester solvents, Texanol and Coasol; and/or
The thickening agent and the rheological agent are respectively and independently selected from one or a combination of more of cellulose thickening agent, alkali swelling thickening agent, polyurethane thickening agent and inorganic thickening agent; and/or
The pH regulator is one or a combination of organic alcamines and organic amines; and/or
The mildew preventive is one or a combination of a plurality of benzimidazole methyl carbamate, 2-n-octyl-4-isothiazoline-3-ketone and butyl carbamate-3-iodo-2-propynyl ester; and/or
The preservative is one or a combination of more of 1, 2-benzisothiazolin-3-one (BIT), 5-chloro-2-methyl-4-isothiazolin-3-one/2-methyl-4-isothiazolin-3-one (CMIT/MIT).
The following are comparative examples.
Example 2
Putting 28 parts by weight of water into a dispersion tank, and stirring by using a dispersion disc, wherein the rotating speed is controlled at 200-300 revolutions per minute; sequentially adding 0.34 part by weight of hydroxyethyl cellulose thickener, 0.1 part by weight of organic amine pH regulator, 0.5 part by weight of special dispersant, 0.1 part by weight of nonionic wetting agent, 0.4 part by weight of a combination of an organic silicon defoaming agent and a mineral oil defoaming agent (the weight ratio of the two is 1: 3), 8 parts by weight of rutile titanium dioxide, 14 parts by weight of mica powder, 7 parts by weight of calcined kaolin and 11 parts by weight of heavy calcium carbonate, adding 1 part by weight of water, increasing the rotating speed to 1500-; then the rotating speed is reduced to 600-800 r/min, and then 23 parts by weight of high Tg small-particle size emulsion, 1.5 parts by weight of glycol cosolvent, 1.7 parts by weight of alcohol ester film-forming assistant, 0.1 part by weight of mildew preventive, 0.18 part by weight of preservative, 0.5 part by weight of rheological agent, 0.6 part by weight of hydrophobic assistant and 1.98 parts by weight of water are sequentially added to obtain a second mixture, namely the high-density low-water-permeability water-based exterior wall polymer coating material.
Comparative example 1
The difference from example 2 is that: 23 parts by weight of the ultrahigh glass transition temperature Tg small-particle size emulsion is changed into 23 parts by weight of the common exterior wall building emulsion paint emulsion.
Comparative example 2
The difference from example 2 is that: 0.5 part by weight of a special dispersant was changed to 0.5 part by weight of a general dispersant.
Comparative example 3
The difference from example 2 is that: 14 parts by weight of mica powder is changed into 14 parts by weight of ground calcium carbonate.
Comparative example 4
Also example 2, the difference is: 0.6 part by weight of hydrophobic auxiliary agent is changed into water, and the total amount is 100 parts.
The weight parts of each component in example 2 and comparative examples 1 to 4 are shown in Table 2.
TABLE 2 table of contents of components in example 2 and comparative examples 1 to 4 in parts by weight
| Components | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| The first part of water | 28 | 28 | 28 | 28 | 28 |
| Thickening agent | 0.34 | 0.34 | 0.34 | 0.34 | 0.34 |
| pH regulator | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Wetting agent | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Special dispersants | 0.5 | 0.5 | / | 0.5 | 0.5 |
| Ordinary dispersant | / | / | 0.5 | / | / |
| Defoaming agent | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Pigment (I) | 8 | 8 | 8 | 8 | 8 |
| Mica powder | 14 | 14 | 14 | / | 14 |
| Ground calcium carbonate | 11 | 11 | 11 | 25 | 11 |
| Calcined kaolin | 7 | 7 | 7 | 7 | 7 |
| The second part of water | 1 | 1 | 1 | 1 | 1 |
| High Tg small particle size emulsions | 23 | / | 23 | 23 | 23 |
| Common exterior wall emulsion | / | 23 | / | / | / |
| Cosolvent | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| Film forming aid | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 |
| Preservative | 0.18 | 0.18 | 0.18 | 0.18 | 0.1 |
| Mildew preventive | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Rheological agent | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Hydrophobic adjuvants | 0.6 | 0.6 | 0.6 | 0.6 | / |
| Third part of water | 1.98 | 1.98 | 1.98 | 1.98 | 2.66 |
The water permeability performance test under GB/T9755-2014 standard is carried out on the example 2 and the comparative examples 1 to 4 of the invention, the water permeability is less than or equal to 1.4mL in the standard 24 hours, and the result is shown in Table 3; the scrub resistance is shown in Table 4.
TABLE 3 Water Permeability test
| Water permeability mL | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| 1# | 1.3 | 1.6 | 1.5 | 1.4 | 1.5 |
| 2# | 1.1 | 1.8 | 1.4 | 1.6 | 1.7 |
| 3# | 1.4 | 1.8 | 1.5 | 1.6 | 1.7 |
| Mean value of water permeation | 1.27 | 1.73 | 1.47 | 1.53 | 1.63 |
TABLE 4 scrub resistance test
| Scrub resistant (second time) | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| 1# | 6000 | 3750 | 5850 | 5400 | 6000 |
| 2# | 5800 | 3800 | 5700 | 5500 | 5700 |
| 3# | 5900 | 3700 | 5700 | 5450 | 5850 |
| Mean scrub resistance | 5900 | 3750 | 5750 | 5450 | 5850 |
From the above data, it can be seen that the formulation of the present invention is superior in water permeation resistance and also superior in scrub resistance, etc., compared to the conventional formulation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; those skilled in the art should also realize that such equivalent variations, modifications, and alterations are possible in light of the above teachings without departing from the spirit and scope of the present invention; meanwhile, any equivalent changes, modifications and evolution made to the above embodiments according to the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The experimental method of the present invention, in which the specific conditions are not specified, is generally carried out under the conventional conditions or the conditions recommended by the manufacturers.
The various optimized technical schemes in the invention can be combined with each other unless otherwise stated.
Unless otherwise indicated, percentages and parts are percentages and parts by weight.
The experimental procedures described in the specification and examples, which do not specify specific conditions, are generally carried out under the conditions which are customary or recommended by the manufacturers.
The various starting materials, reagents, components used in the present invention are, unless otherwise indicated, the corresponding starting materials commonly used in the art.
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. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Claims (7)
1. The high-density low-water-permeability water-based outer wall polymer coating material is characterized in that:
the paint comprises the following components in parts by weight:
wherein the special dispersant is anionic polycarboxylic acid ammonium salt;
wherein the mica powder is a composition of two flaky mica powders: a composition prepared from mica powder with the average particle size of less than or equal to 3um and the average particle size of 5-8 um according to the weight part ratio of 1: 3;
the hydrophobic auxiliary agent is a composition of emulsifying wax and organosilicon hydrophobic auxiliary agent according to a weight ratio of 5: 7.
2. The high-density low-water-permeability water-based exterior wall polymer finishing material as claimed in claim 1, wherein:
the high-Tg small-particle-size emulsion is a pure acrylic emulsion with ultrahigh glass transition temperature Tg fine particle size used for plastic paint or general industrial paint, the particle size distribution of the emulsion is 10-100 nm, the weight percentage of solid content is 47.5-48.5%, the glass transition temperature Tg is 55-60 ℃, and the minimum film-forming temperature MFFT is 50-55 ℃.
3. The high-density low-water-permeability water-based exterior wall polymer finishing material as claimed in claim 1, wherein:
the filler is one or a combination of more of calcined kaolin, talcum powder and calcium carbonate.
4. The high-density low-water-permeability water-based exterior wall polymer finishing material as claimed in claim 1, wherein:
the defoaming agent is one or a combination of an organic silicon defoaming agent and a mineral oil defoaming agent; and/or
The wetting agent is nonionic and is a sugar derivative, an alcohol ether type, a phenol ether type or a combination thereof; and/or
The cosolvent is a diol cosolvent; and/or
The film-forming auxiliary agent is one or a combination of more of alcohol ester solvents, Texanol and Coasol; and/or
The thickening agent and the rheological agent are respectively and independently selected from one or a combination of more of cellulose thickening agent, alkali swelling thickening agent, polyurethane thickening agent and inorganic thickening agent; and/or
The pH regulator is one or a combination of organic alcamines and organic amines; and/or
The mildew preventive is one or a combination of a plurality of benzimidazole methyl carbamate, 2-n-octyl-4-isothiazoline-3-ketone and butyl carbamate-3-iodo-2-propynyl ester; and/or
The preservative is one or a combination of more of 1, 2-benzisothiazolin-3-one (BIT), 5-chloro-2-methyl-4-isothiazolin-3-one/2-methyl-4-isothiazolin-3-one (CMIT/MIT).
5. The preparation method of the high-density low-water-permeability water-based exterior wall polymer coating material as claimed in any one of claims 1 to 4, characterized in that:
it comprises the preparation of a first mixture and a second mixture:
a. wherein said first mixture is prepared as follows:
preparing by using a dispersion disc, and uniformly mixing the first part of water, the thickening agent, the pH regulator, the defoaming agent, the special dispersing agent, the wetting agent, the mica powder, the pigment, the filler and the second part of water under the stirring condition;
b. wherein said second mixture is prepared as follows:
and (2) preparing by using the same dispersion disc, adding a film forming substance, a cosolvent, a film forming aid, a mildew preventive, a preservative, a rheological agent, a hydrophobic aid and third water into the first mixture, and uniformly mixing to prepare a second mixture, so as to obtain the high-density low-water-permeability water-based exterior wall polymer coating material.
6. The preparation method of the high-density low-water-permeability water-based exterior wall polymer coating material of claim 5, which is characterized by comprising the following steps:
the stirring speed in the preparation process of the first mixture is 200-600 revolutions per minute;
the dispersing and stirring speed in the first mixture preparation process is 1200-1800 rpm;
the stirring speed in the preparation process of the second mixture is 600-1000 revolutions per minute.
7. The preparation method of the high-density low-water-permeability water-based exterior wall polymer coating material of claim 5, which is characterized by comprising the following steps:
the stirring speed in the preparation process of the first mixture is 200-300 r/min;
the dispersing and stirring speed in the first mixture preparation process is 1200-1800 rpm;
the stirring speed in the preparation process of the second mixture is 600-900 revolutions per minute.
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| CN116426200A (en) * | 2023-04-28 | 2023-07-14 | 广东坚派新材料有限公司 | Waterproof finish paint for outer wall and preparation method thereof |
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