CN114525047A - Green environment-friendly exterior wall coating and preparation method thereof - Google Patents
Green environment-friendly exterior wall coating and preparation method thereof Download PDFInfo
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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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Abstract
The application belongs to the field of coatings, and relates to a green environment-friendly exterior wall coating and a preparation method thereof. The green environment-friendly exterior wall coating comprises the following components: silica sol, a modifier composition, a dispersing agent, a defoaming agent, a filler, an emulsion, a thickening agent, a pH regulator, a mildew-proof bactericide and water; wherein, the modifier composition comprises 1: (3-10): (2-8) sodium stearate, sodium methylsilicate and potassium pyrophosphate. The preparation method of the green environment-friendly exterior wall coating comprises the following steps: uniformly mixing water, a dispersing agent and a filler, adding a thickening agent and an emulsion, adding a pH regulator, adding silica sol, uniformly mixing, adding a modifier composition, a mildew-proof bactericide and a defoaming agent, and uniformly mixing to obtain the environment-friendly exterior wall coating. The green environment-friendly exterior wall coating is ideal, can reduce the cracking phenomenon of a coating and has good comprehensive performance.
Description
Technical Field
The application relates to the field of coatings, in particular to a green environment-friendly exterior wall coating.
Background
The paint can be coated on the surface of an object by different construction processes to form a continuous solid film with firm adhesion and certain strength. The coating can be divided into organic coating, inorganic-organic composite coating and inorganic coating according to the types of the base materials. In recent years, with the development of the coating industry towards low cost and environmental protection, compared with the traditional organic coating, the inorganic-organic composite coating has the advantages of low organic solvent content, environmental friendliness, rich colors and low cost, and is an environment-friendly exterior wall coating.
However, when the inorganic-organic composite coating is used as an exterior wall coating, during construction in summer, the temperature of the environment for coating operation of the exterior wall is too high, so that the volatilization of water in the coating is accelerated, and the drying of the coating is too fast, so that the coating of the coating is easy to crack, and the overall appearance of a building and the service life of the coating are influenced.
In conclusion, the inventor of the application thinks that the prior industry lacks a green environment-friendly exterior wall coating with low cracking probability and better comprehensive performance.
Disclosure of Invention
In order to reduce the cracking phenomenon of the coating in the high-temperature environment in summer, the application provides a green environment-friendly exterior wall coating and a preparation method thereof.
The application provides green environmental protection exterior wall coating, adopts following technical scheme:
the green environment-friendly exterior wall coating comprises the following components in parts by weight: 80-110 parts of silica sol, 3-15 parts of modifier composition, 1.5-5 parts of dispersing agent, 0.5-3 parts of defoaming agent, 30-50 parts of filler, 50-100 parts of emulsion, 0.5-2 parts of thickening agent, 0.2-2 parts of pH regulator, 2-5 parts of mildew-proof bactericide and 40-60 parts of water;
wherein the content of the first and second substances,
the modifier composition comprises the following components in a weight ratio of 1: (3-10): (2-8) sodium stearate, sodium methylsilicate and potassium pyrophosphate.
By adopting the technical scheme, the modifier composition of sodium stearate, sodium methyl silicate and potassium pyrophosphate is added into the coating as a modifying substance of the coating. Experimental data show that after the modifier composition is added, the coating does not crack after forming a film at the testing temperature of 33-37 ℃; compared with the coating without the modifier composition, the coating has the advantages that the scrubbing resistance and the mould resistance are reduced, the bonding strength is kept at the same level, the water resistance is not obviously reduced, but the indexes meet the technical performance requirements in the general technical requirements of the building exterior wall coating. Analysis the reason why the coating can be slowed down to crack under the high-temperature environment in the application is that the modifier composition of sodium methyl silicate, sodium stearate and potassium pyrophosphate is added to assist in strengthening the network structure of silica sol and emulsion and stabilize the internal structure of the coating. After sodium methyl silicate is added, the sodium methyl silicate is dissolved in water and can be hydrolyzed to generate methyl silanol, the methyl silanol is grafted to a reticular coating film formed by silica gel and emulsion through dehydration condensation, and the sodium stearate and the potassium pyrophosphate are cooperated to stabilize a reticular structure in the coating to play a role in water retention. In addition, the exterior wall coating does not contain harmful substances such as toluene, heavy metals, free formaldehyde and the like, and is an ideal green and environment-friendly exterior wall coating which can reduce the cracking phenomenon of a coating and has better comprehensive performance.
Optionally, the modifier composition comprises 1: (3-5): (2-3) sodium stearate, sodium methyl silicate and potassium pyrophosphate.
Experimental data shows, among the modifier composition, there is the influence in the adhesive force and the water proofness of coating by the weight ratio of sodium stearate, methyl sodium silicate and potassium pyrophosphate, and this application is through adopting above-mentioned technical scheme, carries out the preferred to the ratio of the raw materials of modifier composition, and the outer wall coating adhesive force that makes increases, and water resistance promotes.
Optionally, the modifier composition further comprises sodium alginate, and the weight ratio of the sodium alginate to the sodium methylsilicate is 1 (5-8).
By adopting the scheme, the sodium alginate is added into the modifier composition, so that the stability of the modifier composition can be improved in an auxiliary manner, the silica sol and the emulsion are more fully modified in the coating by the modifier composition, and an obvious modification effect is achieved.
Optionally, the emulsion is selected from one of styrene-acrylic emulsion and pure acrylic emulsion.
Aiming at the application, the styrene-acrylic emulsion, the pure acrylic emulsion and the silica sol have consistent electrical properties, the stability of a mixed system is good, and the toughness, the impact resistance and the like of the coating are excellent.
Optionally, the filler is selected from one or more of calcium carbonate, talcum powder and titanium dioxide.
The filler has good binding property with silica sol, and can play a role in improving the filling performance of the coating and reducing the cost in a paint film. The talcum powder has good lubricity, and is beneficial to improving the dispersibility of the filler in the coating; the calcium carbonate can improve the performances of the coating such as cracking resistance, adhesive force, bonding strength and the like; the titanium dioxide is soft, and is beneficial to improving the toughness of the coating.
Optionally, the thickener is hydroxyethyl cellulose.
According to the application, the hydroxyethyl cellulose is a common thickener in the coating, has an obvious thickening effect, can endow the coating with a certain water retention effect, and simultaneously can endow the coating with certain thixotropy to prevent the coating from precipitating and layering in the storage process.
Optionally, the dispersant is a sodium polycarboxylate dispersant.
For the application, the sodium polycarboxylate dispersing agent has the characteristics of excellent comprehensive performance, good water resistance, small foaming degree, reduction of viscosity of grinding materials, improvement of storage stability of coatings, increase of gloss, leveling and the like.
In a second aspect, the application provides a preparation method of the green environment-friendly exterior wall coating, which adopts the following technical scheme: the preparation method of the green environment-friendly exterior wall coating comprises the following steps:
uniformly mixing water, a dispersing agent and a filler, adding a thickening agent and an emulsion, adding a pH regulator, adding silica sol, uniformly mixing, adding a modifier composition, a mildew-proof bactericide and a defoaming agent, and uniformly mixing to obtain the environment-friendly exterior wall coating.
The coating can be obtained by a mixing mode, traditional processing equipment can be adopted for preparation, and the processing process is easy to control.
To sum up, the application comprises the following beneficial technical effects:
1. according to the application, the modifier composition is added into the exterior wall coating taking the silica sol and the emulsion as film forming substances to modify the coating, and the sodium stearate, the sodium methyl silicate and the potassium pyrophosphate are compounded, so that the coating net structure of the silica sol and the emulsion can be enhanced, the internal structure of the coating is stabilized, and the cracking resistance of the exterior wall coating in a high-temperature construction environment is improved;
2. by adding a proper amount of sodium alginate, the dispersibility and stability of the modifier composition in the coating are improved, and the comprehensive properties of the modified exterior wall coating, such as adhesive force, cracking resistance and the like, are further improved;
3. the prepared exterior wall coating does not contain harmful substances such as toluene, heavy metals and free formaldehyde, meets the requirements of green environment-friendly coatings, and is a green environment-friendly exterior wall coating with better comprehensive performance.
Detailed Description
The present application is described in further detail below.
Introduction of raw materials
The sources and model descriptions of some of the raw materials used in the following examples and comparative examples are shown in Table 1.
Table 1 introduction of sources and types of raw materials
Examples
Examples 1 to 1
The green environment-friendly exterior wall coating comprises the following preparation raw materials in parts by weight: 80kg of silica sol, 15kg of modifier composition, 1.5kg of sodium salt dispersant, 3kg of defoaming agent, 30kg of filler, 100kg of emulsion, 0.5kg of hydroxyethyl cellulose, 2kg of pH regulator, 2kg of mildew-proof bactericide and 60kg of water;
wherein, the modifier composition comprises 1: 3: 8, adopting styrene-acrylic emulsion as the emulsion, adopting calcium carbonate as the filler, namely 1.25kg of sodium stearate, 3.75kg of sodium methyl silicate and 10kg of potassium pyrophosphate.
The preparation method of the green environment-friendly exterior wall coating comprises the following steps:
uniformly mixing water, a dispersing agent and a filler, adding a thickening agent and an emulsion, adding a pH regulator, adding silica sol, uniformly mixing, adding a modifier composition, a mildew-proof bactericide and a defoaming agent, and uniformly mixing to obtain the environment-friendly exterior wall coating.
Examples 1 to 2
The green environment-friendly exterior wall coating comprises the following preparation raw materials in parts by weight: 95kg of silica sol, 9kg of modifier composition, 3kg of sodium salt dispersant, 1.5kg of defoaming agent, 40kg of filler, 75kg of emulsion, 1kg of hydroxyethyl cellulose, 1kg of pH regulator, 2.5kg of mildew-proof bactericide and 50kg of water;
wherein, the modifier composition comprises 1: 10: 2, namely 0.69kg of sodium stearate, 6.92kg of sodium methyl silicate and 1.38kg of potassium pyrophosphate; the emulsion adopts styrene-acrylic emulsion, and the filler adopts talcum powder and titanium dioxide in a weight ratio of 1: 1;
the preparation method of the green environment-friendly exterior wall coating comprises the following steps:
uniformly mixing water, a dispersing agent and a filler, adding a thickening agent and an emulsion, adding a pH regulator, adding silica sol, uniformly mixing, adding a modifier composition, a mildew-proof bactericide and a defoaming agent, and uniformly mixing to obtain the environment-friendly exterior wall coating.
Examples 1 to 3
The green environment-friendly exterior wall coating comprises the following preparation raw materials in parts by weight: 110kg of silica sol, 3kg of modifier composition, 5kg of sodium salt dispersant, 0.5kg of defoaming agent, 50kg of filler, 50kg of emulsion, 2kg of hydroxyethyl cellulose, 0.2kg of pH regulator, 5kg of mildew-proof bactericide and 40kg of water;
wherein, the modifier composition comprises 1: 6: 5, namely 0.25kg of sodium stearate, 1.5kg of sodium methyl silicate and 1.25kg of potassium pyrophosphate, wherein the emulsion is styrene-acrylic emulsion, and the filler is talcum powder and titanium dioxide in a weight ratio of 1: 1;
the preparation method of the green environment-friendly exterior wall coating comprises the following steps:
uniformly mixing water, a dispersing agent and a filler, adding a thickening agent and an emulsion, adding a pH regulator, adding silica sol, uniformly mixing, adding a modifier composition, a mildew-proof bactericide and a defoaming agent, and uniformly mixing to obtain the environment-friendly exterior wall coating.
Examples 1 to 4
The green environment-friendly exterior wall coating is different from the coating of the embodiment 1-2 in that: the modifier composition is prepared from different raw materials in a weight ratio of 1: 3: 3 sodium stearate, sodium methyl silicate and potassium pyrophosphate, namely 1.28kg of sodium stearate, 3.85kg of sodium methyl silicate and 3.85kg of potassium pyrophosphate.
Examples 1 to 5
The green environment-friendly exterior wall coating is different from the coating of the embodiment 1-2 in that: the modifier composition is prepared from different raw materials in a weight ratio of 1: 5: 2 sodium stearate, sodium methyl silicate and potassium pyrophosphate, namely 1.125kg of sodium stearate, 5.625kg of sodium methyl silicate and 2.25kg of potassium pyrophosphate.
Examples 1 to 6
The green environment-friendly exterior wall coating is different from the coating of the embodiment 1-2 in that: the modifier composition is prepared from different raw materials in a weight ratio of 1: 4: 2.5 of sodium stearate, sodium methyl silicate and potassium pyrophosphate, namely 1.2kg of sodium stearate, 4.8kg of sodium methyl silicate and 3kg of potassium pyrophosphate.
Example 2-1
The green environment-friendly exterior wall coating is different from the embodiments 1 to 5 in that: raw materials for preparing the modifier composition comprise sodium stearate, sodium methyl silicate, potassium pyrophosphate and sodium alginate, wherein the weight ratio of the sodium alginate to the sodium methyl silicate is 1: 5.
Examples 2 to 2
The green environment-friendly exterior wall coating is different from the coating of the embodiment 2-1 in that: in the raw materials for preparing the modifier composition, the weight ratio of sodium alginate to sodium methyl silicate is 1: 8.
Examples 2 to 3
The green environment-friendly exterior wall coating is different from the coating of the embodiment 2-1 in that: in the raw materials for preparing the modifier composition, the weight ratio of sodium alginate to sodium methyl silicate is 1: 6.5.
Comparative example
Comparative example 1
The existing green environment-friendly exterior wall coating is purchased from the market, is an organic-inorganic composite coating, takes water, a dispersing agent, silica sol, emulsion, titanium pigment, heavy calcium carbonate, a thickening agent, a defoaming agent and a dispersing agent as main raw materials, and has excellent water resistance and workability and better comprehensive performance.
Comparative example 2
Comparative example 2 differs from example 2-1 in that: the raw materials for preparing the green environment-friendly exterior wall coating have different component proportions, wherein the weight ratio of the components is 3: 5: 1: 2 sodium stearate, sodium methylsilicate, potassium pyrophosphate and sodium alginate.
Performance detection
The coatings prepared in examples 1-1 to 1-6, 2-1 to 2-3 and comparative examples 1 to 3 were tested for adhesion, environmental protection, and high-temperature initial-stage drying crack resistance.
The adhesive force test is rated according to the regulation in GB/T9286-1998, a concrete substrate is adopted, the adhesive force is rated as 0-5 and 5 in total, and the smaller the grade number is, the better the adhesive force is represented; the high-temperature initial-stage drying crack resistance test is carried out according to the specification of JG/T26-2022 of the inorganic building coating of the outer wall, a cement board substrate is adopted, the test temperature is (35 +/-2) DEG C, and whether the conditions of foaming, cracking, peeling and powder falling exist or not is observed; the water resistance is tested according to the specification of JG/T512-2017, the water resistance grades are divided into 2 grades I-II, the grading index is the water resistance time, the time is the grade I when the time is more than or equal to 96h, the time is the grade II when the time is more than or equal to 168h, and the longer the water resistance time is, the higher the grade is, the better the water resistance is. The results of the adhesion, high temperature early dry cracking resistance, water resistance and water-resistant time tests are shown in table 2.
TABLE 2 adhesion, Water resistance, Water-holding time, high temperature early drying crack resistance test results for the coatings
| Sample (I) | Adhesion/grade | High temperature early drying crack resistance | Water-tolerant time | Water resistance/grade |
| Example 1-1 | Level 1 | Without cracks | 125 | Ⅰ |
| Examples 1 to 2 | Level 1 | Without cracks | 158 | Ⅰ |
| Examples 1 to 3 | Level 1 | Without cracks | 113 | Ⅰ |
| Examples 1 to 4 | Level 0 | Without cracks | 135 | Ⅰ |
| Examples 1 to 5 | Level 1 | Without cracks | 175 | Ⅱ |
| Examples 1 to 6 | Level 1 | Without cracks | 151 | Ⅰ |
| Example 2-1 | Level 0 | Without cracks | 184 | Ⅱ |
| Examples 2 to 2 | Level 0 | Without cracks | 166 | Ⅰ |
| Examples 2 to 3 | Level 0 | Without cracks | 134 | Ⅰ |
| Comparative example 1 | Level 0 | Slight crack and powder falling phenomenon | 177 | Ⅱ |
| Comparative example 2 | Stage 2 | Obvious cracks, peeling-off phenomena and chalking phenomena | 99 | Ⅰ |
According to the test data recorded in Table 2, from examples 1-1 to 1-6 and examples 2-1 to 2-3, it can be seen that the high-temperature initial drying crack resistance of the environment-friendly exterior wall coating prepared by the method meets the standard requirements in the general technical requirements of the exterior wall coatings of buildings, the environment-friendly exterior wall coating is applied at the test temperature of (35 +/-2) DEG C, the dried coating has no cracks, and the environment of foaming, cracks, peeling and powder falling are avoided after drying for 6 hours.
The reason for analyzing the effect is that after the modifier composition is added to the environment-friendly exterior wall coating, the network structure of the silica sol and the emulsion is enhanced in an auxiliary manner, so that the internal structure of the coating is stabilized. After sodium methyl silicate is added, the sodium methyl silicate is dissolved in water and can be hydrolyzed to generate methyl silanol, and the methyl silanol is grafted to a reticular coating film formed by silica gel and emulsion through dehydration condensation to play a role in water retention. In addition, the sodium salt dispersing agent is added into the coating, so that the modified composition is favorably dispersed in the coating, and sodium stearate and potassium pyrophosphate in the modifier composition can assist sodium methyl silicate and calcium stearate to modify, so that a synergistic effect is generated, the high-temperature initial drying crack resistance of the coating is further improved, and the adhesion of the coating is ensured.
As can be seen from examples 1-4 to 1-6 and examples 1-2, the proportion of sodium stearate, sodium methyl silicate and potassium pyrophosphate has an influence on the water resistance of the coating, and the water resistance time of the prepared coating are obviously superior to those of other examples, which shows that the modifier composition adopts the components in a weight ratio of 1: 5: 3, the modification effect of the modifier composition can be improved, and the comprehensive performance of the coating can be improved.
In addition, as can be seen from the comparison between examples 2-1 to 2-3 and examples 1-5, the adhesion and water resistance of the coating prepared in examples 2-1 to 2-3 are significantly better than those of examples 1-5. Therefore, the adhesion and water resistance of the prepared coating are improved after the sodium alginate is added into the modifier composition. The sodium alginate can assist the sodium methyl silicate and the calcium stearate to generate a synergistic effect to modify, so that the high-temperature initial drying crack resistance of the coating is further improved, and the adhesion of the coating is ensured.
Compared with the comparative example 2, the adhesion and the high-temperature initial drying crack resistance of the coating prepared in the example 2-1 are obviously improved, which shows that the formula of the modifier composition containing sodium stearate, sodium methyl silicate, potassium pyrophosphate and sodium alginate has a great influence on the performance of the coating, and the components of the modifier composition can generate a synergistic effect, so that the comprehensive performance of the coating can be further improved under a proper proportion.
According to the test data reported in Table 2, compared with comparative example 1, the adhesion of the coating materials prepared in examples 2-1 to 2-3 of the present application is close to that of the coating material prepared in the present application, the high temperature initial drying crack resistance is significantly improved, and the water resistance is reduced to a different extent. The technical scheme of the application can greatly improve the high-temperature initial drying crack resistance of the coating, and meanwhile, the adhesive force of the coating is ensured. When the silica sol is an unstable silica gel dispersion, the stability of the silica gel dispersion is affected after the modifier composition is added, so that the water resistance time and the water resistance of the coating are reduced to a certain extent.
In conclusion, the environment-friendly exterior wall coating prepared by the method is an ideal environment-friendly exterior wall coating which can reduce the cracking phenomenon of a coating and has better comprehensive performance.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The green environment-friendly exterior wall coating is characterized by comprising the following components in parts by weight: 80-110 parts of silica sol, 3-15 parts of modifier composition, 1.5-5 parts of dispersing agent, 0.5-3 parts of defoaming agent, 30-50 parts of filler, 50-100 parts of emulsion, 0.5-2 parts of thickening agent, 0.2-2 parts of pH regulator, 2-5 parts of mildew-proof bactericide and 40-60 parts of water;
wherein the content of the first and second substances,
the modifier composition comprises the following components in a weight ratio of 1: (3-10): (2-8) sodium stearate, sodium methylsilicate and potassium pyrophosphate.
2. The environment-friendly exterior wall coating of claim 1, wherein: the modifier composition comprises the following components in a weight ratio of 1: (3-5): (2-3) sodium stearate, sodium methyl silicate and potassium pyrophosphate.
3. The environment-friendly exterior wall coating of claim 1, wherein: the modifier composition also comprises sodium alginate, and the weight ratio of the sodium alginate to the sodium methylsilicate is 1 (5-8).
4. The environment-friendly exterior wall coating of claim 1, wherein: the emulsion is selected from one of styrene-acrylic emulsion and pure acrylic emulsion.
5. The environment-friendly exterior wall coating of claim 1, wherein: the filler is selected from one or more of calcium carbonate, talcum powder and titanium dioxide.
6. The environment-friendly exterior wall coating of claim 1, wherein: the thickening agent adopts hydroxyethyl cellulose.
7. The environment-friendly exterior wall coating of claim 1, wherein: the dispersant is a sodium polycarboxylate dispersant.
8. The preparation method of the green environment-friendly exterior wall coating according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
uniformly mixing water, a dispersing agent and a filler, adding a thickening agent and an emulsion, adding a pH regulator, adding silica sol, uniformly mixing, adding a modifier composition, a mildew-proof bactericide and a defoaming agent, and uniformly mixing to obtain the environment-friendly exterior wall coating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115109477A (en) * | 2022-07-12 | 2022-09-27 | 广西维一涂料制造有限公司 | Green environment-friendly exterior wall coating |
| CN116875093A (en) * | 2023-07-13 | 2023-10-13 | 山东辉石能源工程有限公司 | Liquid sol steel anti-corrosion coating and preparation method thereof |
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| CN103602106A (en) * | 2013-11-19 | 2014-02-26 | 青岛广联达精密机械有限公司 | Anti-cracking water-resistant coating |
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| CN102408220A (en) * | 2011-08-08 | 2012-04-11 | 华南理工大学 | All-in-one water-borne inorganic-organic hybrid architectural coating and preparation method thereof |
| CN103602106A (en) * | 2013-11-19 | 2014-02-26 | 青岛广联达精密机械有限公司 | Anti-cracking water-resistant coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115109477A (en) * | 2022-07-12 | 2022-09-27 | 广西维一涂料制造有限公司 | Green environment-friendly exterior wall coating |
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| CN114525047B (en) | 2023-03-24 |
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