Special pigment for super-weather-resistant waterproof wall painting and preparation method thereof

Abstract

The invention belongs to the technical field of pigments, and particularly relates to a special super-weather-resistant waterproof pigment for murals and a preparation method thereof.The special super-weather-resistant waterproof pigment for the murals is prepared from, by weight, 100 parts of distilled water, 70-75 parts of phthalocyanine blue, 15-20 parts of modified nano materials, 20-25 parts of polyvinyl alcohol, 5-10 parts of sodium bicarbonate, 7-12 parts of talcum powder and 3-5 parts of polytetrafluoroethylene powder. 4-8 parts of polyvinyl pyrrolidone, 2-3 parts of sodium citrate and 5-8 parts of a mixed surfactant. The prepared special pigment for the wall painting is good in weather resistance, fire resistance and water resistance, high in storage stability and extremely high in use value.

Description

Technical Field

[0001] This application belongs to the technical field of pigments and relates to a special pigment for super weather-resistant and waterproof murals and a preparation method thereof. Background Art

[0002] The in-situ protection of tomb murals is a complex and delicate task aimed at maximizing the retention of the original information and historical value of the murals. Since murals are often located in underground environments and have experienced long-term natural erosion and human damage, the protection work needs to consider a variety of factors and technical means.

[0003] The pigments used in tomb murals will face various problems in a humid environment. These problems will not only affect the appearance of the murals but also make it difficult to preserve them in the long term: (1) Many pigments used in ancient murals are water-soluble, such as certain plant dyes and mineral pigments. In a humid environment, moisture will cause these pigments to dissolve and migrate, resulting in the diffusion and blurring of colors; (2) Moisture will promote the dissolution of salts in the soil and rock and move to the surface of the murals along with the water. When the water evaporates, the salts will crystallize, causing the peeling or blistering of the pigment layer. (2) A humid environment is an ideal condition for the growth of molds and other microorganisms. Molds will form spots on the surface of the murals, which not only affect the beauty but also further damage the pigments and substrate materials; (3) The metabolic activities of microorganisms will produce acidic substances, which will corrode the pigments and substrate, resulting in the degradation and damage of the murals. (4) Salts will chemically react with the pigments and substrate materials in a humid environment to form new compounds. These compounds may cause further damage to the murals, such as corrosion and discoloration.

[0004] In order to protect tomb murals from the influence of a humid environment, the following measures are mainly taken in the prior art: (1) Install dehumidification equipment to keep the relative humidity in the tomb between 45% and 65%. (2) Coat a transparent moisture-proof material, such as acrylic resin, on the surface of the murals to prevent water penetration. (3) Treat the murals with a mildew inhibitor to inhibit the growth of molds. (4) Chemical restoration: Use chemical reagents to remove salt crystals and other harmful substances. Through these measures, tomb murals can be effectively protected to a certain extent and their preservation life can be extended, but there is currently no special pigment for murals that has good comprehensive effects of weather resistance, heat and humidity resistance, and water resistance at the same time. Summary of the Invention

[0005] One of the purposes of this application is to provide a special pigment for super weather-resistant and waterproof murals and a preparation method thereof.

[0006] The present application provides a special pigment for super weather-resistant and waterproof murals, comprising the following components in parts by weight: 100 parts of distilled water, 70 - 75 parts of phthalocyanine blue, 15 - 20 parts of modified nanomaterials, 20 - 25 parts of polyvinyl alcohol, 5 - 10 parts of sodium bicarbonate, 7 - 12 parts of talcum powder, 3 - 5 parts of polytetrafluoroethylene powder, 4 - 8 parts of polyvinylpyrrolidone, 2 - 3 parts of sodium citrate, and 5 - 8 parts of mixed surfactants.

[0007] In some embodiments of the present application, the preparation method of the modified nanomaterials comprises the following steps:

[0008] (1) Mix titanium dioxide, cerium oxide, and single-walled carbon nanotubes to obtain nanomaterials;

[0009] (2) Disperse 50 parts of nanomaterials in 150 - 160 parts of tetrahydrofuran by weight to obtain a mixed solution A; dissolve 20 - 25 parts of alkyd resin in 130 parts of tetrahydrofuran to obtain a mixed solution B;

[0010] (3) Mix the mixed solution A prepared in step (2) with the mixed solution B, stir at 150 - 200 rpm for 30 - 40 min, pour it into 550 - 600 parts of absolute ethanol, precipitate, filter, wash, and dry to obtain modified nanomaterials.

[0011] In some embodiments of the present application, the alkyd resin is purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd., CAS No. 63148 - 69 - 6.

[0012] In some embodiments of the present application, the weight ratio of titanium dioxide, cerium oxide, and single-walled carbon nanotubes is 1:(0.3 - 0.6):(1.2 - 1.5).

[0013] In some embodiments of the present application, the particle size of the titanium dioxide is 10 - 15 nm, the specific surface area is 30 - 40 m 2 / g, the diameter of the single-walled carbon nanotubes is 1 - 2 nm, the length is 5 - 30 μm, and the specific surface area is 120 m 2 / g; the particle size of nano cerium oxide is 5 - 15 nm, and the specific surface area is 20 - 40 m 2 / g.

[0014] The environment where funerary murals are located is often relatively humid. Especially when the tomb is excavated, the environment originally below the groundwater level comes into contact with the outside air, and the humidity conditions change, which easily causes the mural materials to absorb moisture and expand, delaminate or fall off; excessive light not only causes the colors of the murals to fade, but may also accelerate the aging process of the mural materials. Phthalocyanine Blue is a widely used organic pigment with bright colors and good coloring power. However, Phthalocyanine Blue is highly sensitive to light and is prone to photodegradation when exposed to ultraviolet light for a long time, resulting in color fading or darkening. The present invention attempts to improve the weather resistance of Phthalocyanine Blue pigment by adding nanomaterials, but the effect is not ideal. The present invention can improve the weather resistance of Phthalocyanine Blue pigment by using alkyd resin to modify the nanomaterials. The modified nanomaterials have better compatibility with other components in the system. The three nanomaterials produce a synergistic effect through compounding, making the pigment have higher chemical stability and antioxidant properties, and at the same time can well shield the irradiation of light. It can also improve the fire resistance of the pigment.

[0015] In some embodiments of the present application, the mixed surfactant includes sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether and polyethylene glycol stearate PEG-100 in a weight ratio of 1:(1.2 - 1.4):(0.5 - 0.7).

[0016] In some embodiments of the present application, the preparation method of fatty alcohol polyoxyethylene ether includes the following steps:

[0017] (1) Mix magnesium nitrate, magnesium carbonate and an aqueous sodium hydroxide solution with a concentration of 15 - 20 wt%, stir at 15°C - 25°C for 20 - 30 min, then filter, dry, calcine at 800°C - 900°C for 6 - 8 h, and pass through a 100-mesh sieve to obtain a catalyst;

[0018] (2) Under a nitrogen atmosphere, add 265 - 268 parts by weight of ethylene oxide to 280 parts by weight of octyldecanol (CAS No.: 85566 - 12 - 7, Zhejiang Boju New Materials Co., Ltd.), 0.3 - 0.35 parts by weight of dodecyldimethylbenzylammonium chloride (CAS: 139 - 07 - 1) and 0.15 - 0.16 parts by weight of the catalyst at 130 - 135°C and 0.01 MPa, keep the temperature for reaction for 0.6 - 0.8 h, and then cool to obtain fatty alcohol polyoxyethylene ether.

[0019] The present invention attempts to improve the storage stability of pigments by adding commercially available surfactants, but the effect is not ideal. By compounding commercially available surfactants with self-made surfactants, the present invention can improve the storage stability of raw materials, and at the same time improve the moisture and heat resistance and waterproof performance of pigments. Different molecular weights of fatty alcohol polyoxyethylene ethers will affect the dispersibility and emulsifying properties of surfactants. The fatty alcohol polyoxyethylene ether prepared in the present invention is compounded with sodium dodecyl sulfate and polyethylene glycol stearate PEG-100. Since different types of surfactants have different hydrophilic-lipophilic balances, compounding can more effectively disperse pigment particles and prevent sedimentation and caking. The compounded surfactant can form a denser protective layer on the surface of the pigment, reduce the penetration of moisture, and prevent performance degradation caused by moisture.

[0020] In some embodiments of the present application, the weight ratio of magnesium nitrate, magnesium carbonate and sodium hydroxide is 1:(2-4):(5-7).

[0021] The present invention provides a method for preparing the super weather-resistant and waterproof mural special pigment, which includes the following steps: adding components into a reaction tank, stirring while adding, and obtaining a crude slurry after uniform stirring, and then entering a grinding machine for grinding. The fineness of the ground slurry is above 1000 mesh to obtain the super weather-resistant and waterproof mural special pigment.

[0022] Compared with the prior art, the present application obtains at least the following technical effects, for example:

[0023] (1) By using alkyd resin to improve the nanomaterials, the present invention can improve the weather resistance of phthalocyanine blue pigments; at the same time, it can also improve the fire resistance of pigments.

[0024] (2) By compounding commercially available surfactants with self-made surfactants, the present invention can improve the storage stability of raw materials, and at the same time improve the moisture and heat resistance and waterproof performance of pigments. Detailed Embodiments

[0025] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below. However, it should be understood that the description herein is only used to explain the present invention and is not used to limit the scope of the present invention.

[0026] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The reagents and instruments used herein are all commercially available, and the related characterization means can be referred to the relevant descriptions in the prior art and will not be elaborated herein.

[0027] Example 1

[0028] This embodiment provides a special pigment for super weather-resistant waterproof murals, which comprises the following components in parts by weight: 100 parts of distilled water, 72 parts of phthalocyanine blue, 18 parts of modified nanomaterials, 23 parts of polyvinyl alcohol, 7 parts of sodium bicarbonate, 9 parts of talcum powder, 4 parts of polytetrafluoroethylene powder, 6 parts of polyvinylpyrrolidone, 3 parts of sodium citrate and 6 parts of mixed surfactant.

[0029] Phthalocyanine blue, Pengxia Furnace Lining Material Processing Factory, Lingshou County. Polyvinyl alcohol, Henan Shoujie Chemical Products Co., Ltd. Talcum powder, Shanghai Yuanjiang Chemical Co., Ltd., 8000 mesh. Polytetrafluoroethylene powder, Nanjing Tianshi New Materials Technology Co., Ltd., PTFE-200D. Polyvinylpyrrolidone, Wenzhou Shoucheng Chemical Technology Co., Ltd., polyvinylpyrrolidone k30.

[0030] The preparation method of the modified nanomaterials comprises the following steps:

[0031] (1) Mix titanium dioxide, cerium oxide and single-walled carbon nanotubes in a weight ratio of 1:0.4:1.3 to obtain nanomaterials; the particle size of the titanium dioxide is 10-15 nm, and the specific surface area is 30-40 m 2 / g, purchased from Beijing Decodaojin Technology Co., Ltd.; the diameter of the single-walled carbon nanotubes is 1-2 nm, the length is 5-30 μm, and the specific surface area is 120 m 2 / g, purchased from Xianfeng Nano; the particle size of nano cerium oxide is 5-15 nm, and the specific surface area is 20-40 m 2 / g, purchased from Beijing Decodaojin Technology Co., Ltd.

[0032] (2) By weight, disperse 50 parts of nanomaterials in 155 parts of tetrahydrofuran to obtain a mixed solution A; dissolve 22 parts of alkyd resin in 130 parts of tetrahydrofuran to obtain a mixed solution B;

[0033] (3) Mix the mixed solution A prepared in step (2) with the mixed solution B, stir at 170 rpm for 40 min, pour it into 580 parts of absolute ethanol, precipitate, filter, wash, and dry to obtain the modified nanomaterials.

[0034] The alkyd resin is purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd., CAS No. 63148-69-6.

[0035] The mixed surfactant comprises sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether and polyethylene glycol stearate PEG-100 in a weight ratio of 1:1.3:0.6.

[0036] The preparation method of the fatty alcohol polyoxyethylene ether comprises the following steps:

[0037] (1) Mix magnesium nitrate, magnesium carbonate and an aqueous sodium hydroxide solution with a concentration of 17 wt% at 20 °C, stir for 25 min, then filter, dry, calcine at 850 °C for 7 h, and sieve through a 100-mesh sieve to obtain the catalyst; the weight ratio of magnesium nitrate, magnesium carbonate and sodium hydroxide is 1:3:6.

[0038] (2) Under a nitrogen atmosphere, add 267 parts by weight of ethylene oxide to 280 parts by weight of octyldecanol (CAS No.: 85566-12-7, Zhejiang Boju New Materials Co., Ltd.), 0.32 parts by weight of dodecyldimethylbenzylammonium chloride (CAS: 139-07-1), and 0.16 parts by weight of the catalyst at 132 °C and 0.01 MPa, hold the reaction for 0.7 h, and then cool to obtain fatty alcohol polyoxyethylene ether.

[0039] The preparation method of the super weather-resistant and waterproof mural special pigment includes the following steps: Add the components into a reaction tank, stir while adding, and stir evenly to obtain a crude slurry, which then enters a grinding machine for grinding. The fineness of the ground slurry is above 1000 mesh to obtain the super weather-resistant and waterproof mural special pigment.

[0040] Example 2

[0041] This example provides a super weather-resistant and waterproof mural special pigment, which includes the following components in parts by weight: 100 parts of distilled water, 75 parts of phthalocyanine blue, 15 parts of modified nanomaterials, 25 parts of polyvinyl alcohol, 5 parts of sodium bicarbonate, 12 parts of talc powder, 3 parts of polytetrafluoroethylene powder, 8 parts of polyvinylpyrrolidone, 2 parts of sodium citrate, and 8 parts of mixed surfactants.

[0042] Phthalocyanine blue, Pengxia Furnace Lining Materials Factory, Lingshou County. Polyvinyl alcohol, Henan Shoujie Chemical Products Co., Ltd. Talc powder, Shanghai Yuanjiang Chemical Co., Ltd., 8000 mesh. Polytetrafluoroethylene powder, Nanjing Tianshi New Materials Technology Co., Ltd., PTFE-200D. Polyvinylpyrrolidone, Wenzhou Shoucheng Chemical Technology Co., Ltd., polyvinylpyrrolidone k30.

[0043] The preparation method of the modified nanomaterials includes the following steps:

[0044] (1) Mix titanium dioxide, cerium oxide and single-walled carbon nanotubes with a weight ratio of 1:0.3:1.2 to obtain nanomaterials; the particle size of the titanium dioxide is 10-15 nm, and the specific surface area is 30-40 m 2 / g, purchased from Beijing DeKeDaoJin Technology Co., Ltd.; the diameter of the single-walled carbon nanotubes is 1-2 nm, the length is 5-30 μm, and the specific surface area is 120 m 2 / g, purchased from Xianfeng Nano; the particle size of nano cerium oxide is 5-15 nm, and the specific surface area is 20-40 m 2 / g, purchased from Beijing Decod Island Gold Technology Co., Ltd.

[0045] (2) By weight, 50 parts of the nanomaterial were dispersed in 160 parts of tetrahydrofuran to obtain a mixed solution A; 20 parts of alkyd resin were dissolved in 130 parts of tetrahydrofuran to obtain a mixed solution B.

[0046] (3) The mixed solution A and the mixed solution B prepared in step (2) were mixed, stirred at 200 rpm for 40 min, poured into 550 parts of absolute ethanol, and precipitated. The precipitate was filtered out, washed, and dried to obtain the modified nanomaterial.

[0047] The alkyd resin was purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd., CAS No. 63148-69-6.

[0048] The mixed surfactant includes sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether, and polyethylene glycol stearate PEG-100 with a weight ratio of 1:1.2:0.5.

[0049] The preparation method of the fatty alcohol polyoxyethylene ether includes the following steps:

[0050] (1) Magnesium nitrate, magnesium carbonate, and an aqueous sodium hydroxide solution with a concentration of 15 wt% were mixed, stirred at 25 °C for 30 min, filtered, dried, calcined at 800 °C for 8 h, and passed through a 100-mesh sieve to obtain a catalyst; the weight ratio of magnesium nitrate, magnesium carbonate, and sodium hydroxide was 1:2:7.

[0051] (2) Under a nitrogen atmosphere, 280 parts by weight of octyldecanol (CAS No.: 85566-12-7, Zhejiang Boju New Materials Co., Ltd.), 0.3 parts by weight of dodecyldimethylbenzylammonium chloride (CAS: 139-07-1), and 0.16 parts by weight of the catalyst were added with 268 parts by weight of ethylene oxide at 130 °C and 0.01 MPa, and the mixture was kept at a constant temperature for 0.8 h and then cooled to obtain the fatty alcohol polyoxyethylene ether.

[0052] The preparation method of the super-weather-resistant and waterproof mural special pigment includes the following steps: The components were added into a reaction tank, stirred while adding, and the uniformly stirred crude slurry was then ground in a grinding machine. The fineness of the ground slurry was over 1000 mesh to obtain the super-weather-resistant and waterproof mural special pigment.

[0053] Comparative Example 1

[0054] The difference between this comparative example and Example 1 is that a super-weather-resistant and waterproof mural special pigment includes the following components in parts by weight: 100 parts of distilled water, 72 parts of phthalocyanine blue, 10 parts of modified nanomaterial, 27 parts of polyvinyl alcohol, 7 parts of sodium bicarbonate, 9 parts of talcum powder, 8 parts of polytetrafluoroethylene powder, 2 parts of polyvinylpyrrolidone, 3 parts of sodium citrate, and 10 parts of mixed surfactant.

[0055] Comparative Example 2

[0056] The difference between this comparative example and Example 1 is that titanium dioxide, cerium oxide and single-walled carbon nanotubes with a weight ratio of 1:1:1 are mixed to obtain a nanomaterial.

[0057] Comparative Example 3

[0058] The difference between this comparative example and Example 1 is that the particle size of titanium dioxide is 50 - 60 nm, and the specific surface area is 30 - 40 m 2 / g. The diameter of the single-walled carbon nanotubes is 4 - 6 nm, the length is 20 - 30 μm, and the specific surface area is 80 m 2 / g; the particle size of nano-aluminum oxide is 20 - 30 nm, and the specific surface area is 50 - 100 m 2 / g; and the particle size of nano-ceria is 30 - 50 nm, and the specific surface area is 40 - 60 m 2 / g.

[0059] Comparative Example 4

[0060] The difference between this comparative example and Example 1 is that the mixed surfactant includes sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether and polyethylene glycol stearate PEG - 100 with a weight ratio of 1:1:1.

[0061] The preparation method of fatty alcohol polyoxyethylene ether includes the following steps:

[0062] (1) Mix magnesium nitrate, magnesium carbonate and an aqueous sodium hydroxide solution with a concentration of 17 wt% at 20 °C, stir for 25 min, then filter, dry, calcine at 850 °C for 7 h, and pass through a 100-mesh sieve to obtain a catalyst; the weight ratio of magnesium nitrate, magnesium carbonate and sodium hydroxide is 1:3:6.

[0063] (2) Under a nitrogen atmosphere, add 280 parts by weight of octyldecanol (CAS No.: 85566 - 12 - 7, Zhejiang Boju New Materials Co., Ltd.), 0.32 parts by weight of dodecyldimethylbenzylammonium chloride (CAS: 139 - 07 - 1), and 0.16 parts by weight of the catalyst. At 132 °C and 0.01 MPa, add 267 parts by weight of ethylene oxide, keep the temperature for reaction for 0.7 h, and then cool to obtain fatty alcohol polyoxyethylene ether.

[0064] Comparative Example 5

[0065] The difference between this comparative example and Example 1 is that fatty alcohol polyoxyethylene ether is replaced by fatty alcohol polyoxyethylene ether AEO - 9, Shandong Jubang Chemical Co., Ltd.

[0066] Comparative Example 6

[0067] The difference between this comparative example and Example 1 is that the mixed surfactant comprises nonylphenol polyoxyethylene ether, Tween 60 and Span 80 with a weight ratio of 1:1.3:0.6.

[0068] Performance Test

[0069] Perform performance tests on the super weather-resistant waterproof mural special pigments prepared in Examples 1-2 and Comparative Examples 1-6.

[0070] (1) Lightfastness test: Use a Q-SUN weather resistance tester (model Xe-1-S) and an X-RITE color densitometer. Apply the super weather-resistant waterproof mural special pigment on ordinary A4 paper with the same coating thickness. Under the condition of an environmental humidity of 90%, measure the change in color density before and after 1000 hours of Q-SUN irradiation. Evaluation criteria: A: less than 10%; B: 10-30%; C: greater than 30%.

[0071] (2) Damp heat resistance test: Apply the super weather-resistant waterproof mural special pigment on ordinary A4 paper with the same coating thickness. Place the dried material in a variable temperature environment. First, place it in an environment with a relative humidity of 90% and a temperature of 60°C for 7 days, then in an environment with a relative humidity of 60% and a temperature of 40°C for 7 days, and finally in an environment with a relative humidity of 40% and a temperature of 30°C for 7 days, and detect the color difference.

[0072] Use a color difference meter (such as a spectrophotometer) to measure the color data of the standard color plate and the sample respectively. The color difference meter provides three parameters: L* (brightness), a* (red-green axis), and b* (yellow-blue axis), which define the position of the color in the CIELAB color space.

[0073] Calculate the color difference E value:

[0074] The color difference E value (ΔE) can be calculated by the following formula:

[0075] Where:

[0076] ΔL*ΔL* is the brightness difference between the standard color plate and the sample;

[0077] Δa*Δa* is the red-green axis difference between the standard color plate and the sample;

[0078] Δb*Δb* is the yellow-blue axis difference between the standard color plate and the sample;

[0079] (3) Water resistance: Test according to GB / T5211.5-2008.

[0080] (4) Stability test: The special pigment for super weather-resistant waterproof murals was stored at room temperature (25°C) for one year and at high temperature (50°C) for 90 days respectively; it was stored under variable temperature conditions (stored at 4°C for 10 days, 25°C for 10 days, and 45°C for 10 days, for a total of 3 cycles), and whether sedimentation and stratification occurred were observed. If sedimentation or / and stratification occurred, it was recorded as failed; if no sedimentation or / and stratification occurred, it was recorded as passed.

[0081] The results are shown in Table 1.

[0082] Table 1 Performance test results

[0083]

[0084] From the above performance test results, it can be seen that the special pigments for super weather-resistant waterproof murals in Examples 1-2 have good weather resistance, high waterproofness, and good storage stability. In particular, the comprehensive performance of Example 1 is the most prominent, which is mainly due to the synergistic effect between components.

[0085] For the comparative examples, because the necessary technical solutions were not adopted, their performance in the corresponding performance tests was significantly worse than that of the examples. In Comparative Example 1, the component ratio was changed, and it can be seen that the comprehensive effect of the pigment decreased. In Comparative Example 2, the composition of the nanomaterials was different. In Comparative Example 3, the parameters of the nanomaterials were different. From the results, it can be seen that the weather resistance effect of the pigment decreased. In Comparative Example 4, the ratio of the mixed surfactants was different. In Comparative Example 6, the self-made fatty alcohol polyoxyethylene ether was replaced with fatty alcohol polyoxyethylene ether AEO-9. In Comparative Example 7, the types of surfactants used were different. It can be seen that the storage stability of the pigment decreased, and the effects of the damp heat resistance and waterproof performance also decreased. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0086] The applicant declares that the present application uses the above examples to illustrate a charge-induced affinity adsorption medium and its preparation method and application of the present application, but the present application is not limited to the above examples, that is, it does not mean that the present application must rely on the above examples to be implemented. Those skilled in the art should understand that any improvement to the present application, the equivalent replacement of each raw material of the products of the present application, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present application.

[0087] The preferred embodiments of the present application have been described in detail above. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept scope of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection scope of the present application.

[0088] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, this application will not separately describe various possible combination methods.

Claims

1. A special pigment for super weather-resistant waterproof murals, characterized in that, Comprising the following components in parts by weight: 100 parts of distilled water, 70 - 75 parts of phthalocyanine blue, 15 - 20 parts of modified nanomaterials, 20 - 25 parts of polyvinyl alcohol, 5 - 10 parts of sodium bicarbonate, 7 - 12 parts of talcum powder, 3 - 5 parts of polytetrafluoroethylene powder, 4 - 8 parts of polyvinylpyrrolidone, 2 - 3 parts of sodium citrate, and 5 - 8 parts of mixed surfactant.

2. The special pigment for super weather-resistant waterproof murals according to claim 1, wherein The preparation method of the said modified nanomaterials comprises the following steps: (1) Mix titanium dioxide, cerium oxide, and single - walled carbon nanotubes to obtain nanomaterials; (2) By weight, disperse 50 parts of the nanomaterials in 150 - 160 parts of tetrahydrofuran to obtain mixture A; dissolve 20 - 25 parts of alkyd resin in 130 parts of tetrahydrofuran to obtain mixture B; (3) Mix mixture A and mixture B prepared in step (2), stir evenly, pour into 550 - 600 parts of absolute ethanol, precipitate, filter, wash, and dry to obtain the modified nanomaterials.

3. The super weather-resistant and waterproof mural special pigment according to claim 2, characterized in that, The weight ratio of titanium dioxide, cerium oxide, and single - walled carbon nanotubes is 1:(0.3 - 0.6):(1.2 - 1.5).

4. The super-weather-resistant waterproof mural special pigment according to claim 3, characterized in that, The particle size of the titanium dioxide is 10 - 15 nm, and the specific surface area is 30 - 40 m 2 / g. The diameter of the single-walled carbon nanotubes is 1 - 2 nm, the length is 5 - 30 μm, and the specific surface area is 120 m 2 / g; The particle size of the nano cerium oxide is 5 - 15 nm, and the specific surface area is 20 - 40 m 2 / g.

5. The super-weather-resistant waterproof mural special pigment according to claim 2, characterized in that, The stirring condition in step (3) is stirring at 150 - 200 rpm for 30 - 40 min.

6. The super weather-resistant and waterproof mural special pigment according to claim 1, wherein, The said mixed surfactant comprises sodium dodecyl sulfate, fatty alcohol polyoxyethylene ether, and polyethylene glycol stearate PEG - 100 with a weight ratio of 1:(1.2 - 1.4):(0.5 - 0.7).

7. The super-weather-resistant waterproof mural special pigment according to claim 6, characterized in that, The preparation method of fatty alcohol polyoxyethylene ether comprises the following steps: (1) Mix magnesium nitrate, magnesium carbonate, and an aqueous sodium hydroxide solution with a concentration of 15 - 20 wt%, stir at 15℃ - 25℃ for 20 - 30 min, then filter, dry, calcine, and sieve through a 100 - mesh sieve to obtain a catalyst; (2) Under a nitrogen atmosphere, add 265 - 268 parts by weight of ethylene oxide to 280 parts by weight of octyldecanol, 0.3 - 0.35 parts by weight of dodecyldimethylbenzylammonium chloride, and 0.15 - 0.16 parts by weight of the catalyst at 130 - 135℃ and 0.01 MPa, keep the temperature for reaction for 0.6 - 0.8 h, and cool to obtain fatty alcohol polyoxyethylene ether.

8. The super weather-resistant and waterproof mural special pigment according to claim 7, characterized in that The weight ratio of magnesium nitrate, magnesium carbonate, and sodium hydroxide is 1:(2 - 4):(5 - 7).

9. The special pigment for super weather-resistant waterproof murals according to claim 7, characterized in that, The conditions of the said calcination are calcining at 800℃ - 900℃ for 6 - 8 h.

10. A method for preparing a super-weather-resistant and waterproof mural special pigment according to any one of claims 1 to 9, characterized in that, Comprising the following steps: Add the components into a reaction tank, stir while adding, stir evenly to obtain a crude slurry, then enter a grinder for grinding. The fineness of the ground slurry is above 1000 meshes to obtain a special pigment for super - weather - resistant and waterproof murals.

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