CN115537052B - Lithium silicate-based exterior wall inorganic coating capable of preventing snail mark from being generated - Google Patents
Lithium silicate-based exterior wall inorganic coating capable of preventing snail mark from being generated Download PDFInfo
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- CN115537052B CN115537052B CN202211305517.2A CN202211305517A CN115537052B CN 115537052 B CN115537052 B CN 115537052B CN 202211305517 A CN202211305517 A CN 202211305517A CN 115537052 B CN115537052 B CN 115537052B
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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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
- C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
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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
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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Abstract
The invention relates to an external wall inorganic coating for preventing snail marks based on lithium silicate, and belongs to the technical field of building materials. The inorganic coating for the outer wall based on lithium silicate and capable of preventing snail marks comprises the following raw materials: deionized water, a thickening agent, a dispersing agent, a wetting agent, a foam inhibitor, bentonite, attapulgite, kaolin, modified zeolite, heavy calcium, titanium white, modified lithium silicate, a defoaming agent and a leveling agent. The modified lithium silicate is used as a film forming material, the modified zeolite is used as a special filler to prevent the generation of snail marks, and the inorganic coating for the outer wall has the advantages of good water resistance, alkali resistance, stain resistance and the like, and has excellent snail mark generation preventing effect and color retention, so that the inorganic coating for the outer wall is an inorganic coating with excellent performance, and can meet the various demands of consumers.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to an external wall inorganic coating for preventing snail marks based on lithium silicate.
Background
In recent years, inorganic coatings are increasingly widely applied, and especially have a wider application prospect on the outer wall. The inorganic flat coating construction cost is low, the color is rich, and the maintenance cost is low. However, inorganic exterior walls, especially dark colored exterior walls, are susceptible to snail marks, seriously impairing the decorative effect of the exterior wall coating and inhibiting the development of the inorganic exterior wall coating.
The problem of snail mark of the exterior wall coating is very common in the building coating, and the water-based exterior wall coating contains some water-soluble organic substances, such as dispersing agents, wetting agents, thickening agents, emulsifying agents and the like, when rainwater or dew wets the exterior wall surface, the water-soluble organic substances in the paint film are dissolved and carried out by water, and irregular strip marks are formed on the surface of the paint film. The water-soluble organic substances are macromolecular compounds with certain molecular weight, and the macromolecular compounds can form a bright irregular paint film after migrating to the surface of the paint film, which is equivalent to the local finishing of the paint film, and is similar to the trace remained after snails climb through, namely snail trace, also called rain trace. Snail marks can cause different gloss on the surface of a paint film, the change of gloss can cause different colors to look, the appearance of the outer wall surface is seriously influenced, and the influence on the dark outer wall is more obvious.
Conditions for snail mark generation: 1. the paint film is not fully cured, water-soluble organic substances are easy to separate out, and snail marks are most easy to appear within 48 hours after the paint film is coated. 2. The snail mark is most easily generated in the case of light rain due to the influence of weather conditions, and in this case, water-soluble organic substances in a paint film are very easily extracted by rainwater. When the rainwater is large, although water-soluble organic substances can be precipitated, the water-soluble organic substances can be quickly washed away by the rainwater, and snail marks can not be formed by coalescence on the surface of a paint film. The temperature difference between day and night is large, the humidity is large, dew is easily formed on the paint surface due to large fog, large water drops are formed by condensation, water-soluble organic substances in a paint film can be precipitated, and after the water comes out, the water evaporates, bright water-soluble organic substances are left, and snail marks are formed. 3. Influence of paint type and paint color. Since the oil paint does not contain water-soluble organic substances, snail marks are not generated generally, the low-end external wall emulsion paint is not easy to generate, and the white and light-colored external wall paint is not easy to see even if generated due to luster. As a large amount of color paste is added into the dark exterior wall coating, more water-soluble organic substances are introduced, and snail marks are more easily generated.
Snail marks seriously affect the decorative effect of the exterior wall coating, especially the flat-coated colored paint surface, thereby affecting the popularization of the inorganic exterior wall coating, and therefore, the development of the exterior wall inorganic coating capable of effectively preventing snail marks from generating has great significance.
Chinese patent CN114716852A, a lithium silicate inner and outer wall paint and a preparation method thereof, discloses a modified lithium silicate-based inner and outer wall paint and a preparation method thereof, but the paint only researches the stability of inorganic paint and does not pay attention to the effect of the paint on preventing snail marks.
Disclosure of Invention
Aiming at the problems that the existing inorganic exterior wall coating is easy to generate snail marks and seriously damages the decorative effect of the exterior wall coating, the invention provides the exterior wall inorganic coating which takes modified lithium silicate as a film forming material and takes modified zeolite as special filler to prevent snail marks from being generated, which not only has good water resistance, alkali resistance, stain resistance and other performances, but also has excellent snail mark generation preventing effect and color retention, is an inorganic exterior wall coating with excellent performance, and can meet the various demands of consumers.
The invention aims to provide an external wall inorganic coating for preventing snail marks based on lithium silicate.
Another object of the present invention is to provide a method for preparing the above-mentioned lithium silicate-based exterior wall inorganic coating material for preventing snail marks.
The aim of the invention can be achieved by the following technical scheme:
an external wall inorganic coating for preventing snail marks based on lithium silicate comprises the following components in parts by weight: 18-26 parts of deionized water; 0.2 to 0.5 part of thickener; 0.3 to 0.8 part of dispersing agent; 0.1 to 0.3 part of wetting agent; 0.05 to 0.2 portion of foam inhibitor; 0.2-1 part of bentonite; 0.5 to 2 portions of attapulgite; 5-12 parts of kaolin; 3-6 parts of modified zeolite; 8-15 parts of heavy calcium carbonate; 8-16 parts of titanium dioxide; 15-40 parts of modified lithium silicate; 0.1 to 0.3 part of defoaming agent; 0.2 to 0.5 portion of leveling agent.
The applicant of the present application has made a lithium silicate inner and outer wall coating based on modified lithium silicate, which has excellent physical properties, but the coating is poor in snail mark prevention effect.
Because of its special porous structure, zeolite has high specific surface area, and has two adsorption characteristics of selective adsorption and efficient adsorption, and is widely used in various fields. However, the silica structure on the surface of the natural zeolite has strong hydrophilicity, and cations outside the structure are easy to hydrolyze, so that the performance of the natural zeolite for adsorbing organic matters is poor, and in addition, the silica-alumina structure is negatively charged, so that the water-soluble organic matters on the surface of a paint film are difficult to remove by the natural zeolite.
According to repeated researches, the application finds that the zeolite is subjected to specific modification treatment, organic or inorganic impurities on the surface of the zeolite and in the micro-pore canal are removed, the exchange capacity of the zeolite per unit weight is improved, the exchange rate is accelerated, cations in the zeolite are reformed, the ion exchange property is improved, and silane modified lithium silicate is used as a film forming material to be compounded with other components in specific parts by weight to form the external wall inorganic coating which is based on lithium silicate and is used for preventing snail marks from being generated, so that snail marks can be effectively prevented from being generated. The modified zeolite can increase the roughness of the paint film surface, reduce the contact angle of water, improve the anti-condensation capability of a paint film, reduce the influence of different surface glossiness caused by snail marks, and the addition of the porous modified zeolite filler can absorb and retain water-soluble substances in the exterior wall paint, such as various surfactants, so that the water-soluble substances are not easily carried out by rainwater and the like.
As a preferred technical scheme of the invention, the modified zeolite is prepared by the following preparation method:
s1, dissolving KCl and NaOH in water, starting stirring, raising the temperature of the solution to 50 ℃, and slowly adding AL (OH) 3 Cooling to room temperature after complete dissolution, adding zeolite powder into the solution, continuously stirring for 3-4 hours, discarding the solution, washing the precipitate to be neutral by water, evaporating to be solid, calcining for 1.5-2 hours at 300-500 ℃, and grinding the obtained product to 1-5 mu m to obtain powder;
s2, adding the powder obtained in the step S1 into water, adding LiOH solution to adjust the pH value to 11-12.5, heating to 50-60 ℃, adding 3-urea propyl triethoxysilane, continuously adding methyl triethoxysilane, continuously stirring for 2-3 h, dehydrating, drying, and cooling to obtain the modified zeolite.
Preferably, the thickener is hydroxyethyl cellulose.
Preferably, the dispersant is a hydrophobically modified sodium salt of a polycarboxylic acid.
Preferably, the wetting agent is a silicone wetting agent.
Preferably, the suds suppressor and defoamer is a polyether modified silicone defoamer.
Preferably, the leveling agent is a polyurethane modified polyether thickener.
Preferably, the modified lithium silicate is prepared by the following preparation method:
adding lithium silicate solution into a constant temperature device, controlling the temperature to be 50-60 ℃, and stirring; adding 3-urea propyl triethoxysilane, and then adding lithium hydroxide solution to adjust the pH to 11-12.5; and (3) continuously adding gamma-aminopropyl triethoxysilane, adding methyl triethoxysilane, stirring and reacting for 2 hours, and cooling to obtain the modified lithium silicate.
The preparation method of the lithium silicate-based antistatic wall inorganic paint comprises the following steps:
adding a proper amount of water into a dispersing cylinder, stirring, sequentially adding a thickening agent, a dispersing agent, a wetting agent and a foam inhibitor according to a formula, stirring for 40min at a rotating speed of 600-700 ℃, adding all powder materials such as titanium dioxide, heavy calcium, attapulgite, modified zeolite, kaolin and bentonite after the thickening agent is completely dissolved, continuously stirring, and adding modified lithium silicate; continuously stirring for 30min, adding a defoaming agent, a leveling agent and deionized water, and filtering to obtain the lithium silicate-based exterior wall inorganic coating for preventing snail marks.
The invention has the beneficial effects that:
(1) The modified zeolite increases the roughness of the paint film surface, can reduce the contact angle of water, improves the dewing resistance of the paint film, reduces the influence of different surface glossiness caused by snail marks, and the addition of the porous modified zeolite filler can absorb and retain water-soluble substances in the exterior wall paint, such as various surfactants, so that the water-soluble substances are not easy to be carried out by rainwater and the like.
(2) The modified lithium silicate can greatly reduce the introduction of an emulsifying agent, so that the paint film has a certain self-cleaning function by adding hydrophilic property, and even if snail marks are generated, the snail marks are easy to wash away by rainwater.
(3) The modified zeolite, the modified lithium silicate and other components are compounded in specific parts by weight, so that water-soluble organic substances in a paint film are greatly reduced, are not easily carried out by rainwater, but are trapped on the surface of the paint film, and are more easily washed out by the rainwater, and the external wall inorganic paint has excellent snail mark generation preventing effect and color retention.
(4) The exterior wall inorganic coating for preventing snail marks has good water resistance, alkali resistance, stain resistance and the like, and can meet the various demands of consumers.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific embodiments, structures, features and effects according to the present invention in conjunction with examples.
The hydroxyethylcellulose used in the present invention is 250HHBR of leish; the dispersant is 731A in the Dow chemical industry; the wetting agent is LCN407 of Craien; the foam inhibitor and the defoamer are 810 of Digao company; the heavy calcium is 1250-mesh heavy calcium of Guangdong source epitaxy powder material limited company; the titanium dioxide is R996 of the Szechwan python; the leveling agent is 621N of Santopaceae; unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
The inorganic paint formulations of examples 1 to 5 and comparative examples 1 to 3 are shown in tables 1 and 2
Table 1 examples 1 to 5 inorganic paint formulations (parts by mass)
Table 2 comparative examples 1 to 3 inorganic coating formulations (parts by mass)
Coating the coatings of examples 1-5 and comparative examples 1-3 on dark outer walls, brushing deionized water on the surfaces of paint films by wool in the drying process for 2h, 4h, 24h and 48h to form strips on the surfaces of the paint films, visually observing after the water volatilizes and dries, and respectively simulating and testing the generation of snail marks under the conditions of dewing and small rain, wherein the test results are shown in Table 3
TABLE 3 snail mark formation
From the above table, it is known that no obvious snail mark is generated under the conditions of dewing and little rain after the drying for 2h, 4h, 24h and 48h in examples 1-5, which shows that the modified zeolite is used as a coating, the silane modified lithium silicate is used as a film forming material and is compounded with other components according to specific weight parts to form the inorganic coating for the external wall based on lithium silicate and capable of preventing snail mark from generating, so that snail mark generation can be effectively prevented, and the coating has excellent snail mark generation preventing effect and color retention. In comparative example 1, however, no modified zeolite was added, severe snail marks were generated when dried for 2 hours, and slight snail marks were also generated after drying for 48 hours; in comparative example 2, the natural zeolite is used for replacing the modified zeolite, obvious snail marks are generated during drying for 2 hours and 4 hours, which proves that the natural zeolite is difficult to effectively adsorb water-soluble organic substances in the coating, and the snail mark generation prevention effect is poor; whereas the addition of too much modified zeolite in comparative example 3 resulted in too poor a coating dispersion to be tested.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. The inorganic coating for the outer wall based on lithium silicate and capable of preventing snail marks is characterized by comprising the following components in parts by weight: 18-26 parts of deionized water; 0.2 to 0.5 part of thickener; 0.3 to 0.8 part of dispersing agent; 0.1 to 0.3 part of wetting agent; 0.05 to 0.2 portion of foam inhibitor; 0.2-1 part of bentonite; 0.5 to 2 portions of attapulgite; 5-12 parts of kaolin; 3-6 parts of modified zeolite; 8-15 parts of heavy calcium carbonate; 8-16 parts of titanium dioxide; 15-40 parts of modified lithium silicate; 0.1 to 0.3 part of defoaming agent; 0.2 to 0.5 part of flatting agent;
the modified zeolite is prepared by the following preparation method:
s1, dissolving KCl and NaOH in water, starting stirring, raising the temperature of the solution to 50 ℃, and slowly adding Al (OH) 3 Cooling to room temperature after complete dissolution, adding zeolite powder into the solution, continuously stirring for 3-4 hours, discarding the solution, washing the precipitate to be neutral by water, evaporating to be solid, calcining for 1.5-2 hours at 300-500 ℃, and grinding the obtained product to 1-5 mu m to obtain powder;
s2, adding the powder obtained in the S1 into water, adding a LiOH solution to adjust the pH value to 11-12.5, heating to 50-60 ℃, adding 3-urea propyl triethoxysilane, continuously adding methyl triethoxysilane, continuously stirring for 2-3 h, dehydrating, drying, and cooling to obtain the modified zeolite;
the modified lithium silicate is prepared by the following preparation method:
adding lithium silicate solution into a constant temperature device, controlling the temperature to be 50-60 ℃, and stirring; adding 3-urea propyl triethoxysilane, and then adding lithium hydroxide solution to adjust the pH to 11-12.5; and (3) continuously adding gamma-aminopropyl triethoxysilane, adding methyl triethoxysilane, stirring and reacting for 2 hours, and cooling to obtain the modified lithium silicate.
2. The lithium silicate-based exterior wall inorganic coating for preventing snail mark generation according to claim 1, wherein the coating is characterized in that: the thickener is hydroxyethyl cellulose.
3. The lithium silicate-based exterior wall inorganic coating for preventing snail mark generation according to claim 1, wherein the coating is characterized in that: the dispersing agent is sodium polycarboxylate salt subjected to hydrophobic modification.
4. The inorganic coating for external walls for preventing snail marks based on lithium silicate according to claim 1, wherein the wetting agent is an organosilicon wetting agent.
5. The inorganic coating for external walls for preventing snail marks based on lithium silicate according to claim 1, wherein the foam inhibitor and defoamer are polyether modified silicone defoamer.
6. The inorganic coating for external walls for preventing snail marks based on lithium silicate according to claim 1, wherein the leveling agent is polyurethane modified polyether.
7. A method for preparing the lithium silicate-based exterior wall inorganic coating material for preventing snail mark generation according to any one of claims 1 to 6, comprising the steps of:
adding a proper amount of water into a dispersing cylinder, stirring, sequentially adding a thickening agent, a dispersing agent, a wetting agent and a foam inhibitor according to a formula, stirring for 40min at a rotating speed of 600-700 ℃, adding all powder materials such as titanium dioxide, heavy calcium, attapulgite, modified zeolite, kaolin and bentonite after the thickening agent is completely dissolved, continuously stirring, and adding modified lithium silicate; continuously stirring for 30min, adding a defoaming agent, a leveling agent and deionized water, and filtering to obtain the lithium silicate-based exterior wall inorganic coating for preventing snail marks.
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| CN202211305517.2A CN115537052B (en) | 2022-10-24 | 2022-10-24 | Lithium silicate-based exterior wall inorganic coating capable of preventing snail mark from being generated |
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| CN106893431A (en) * | 2017-03-10 | 2017-06-27 | 河北晨阳工贸集团有限公司 | The impermeabilisation anti-soil of resistance to rainprint wall finiss and preparation method thereof |
| CN114479585B (en) * | 2020-10-26 | 2023-02-10 | 立邦涂料（中国）有限公司 | Rain mark resistant high-color-retention high-polymer exterior wall coating and preparation method thereof |
| CN114716852A (en) * | 2022-03-21 | 2022-07-08 | 中山葆信涂料科技有限公司 | Lithium silicate paint for internal and external walls and preparation method thereof |
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