Super-flexible travertine-like coating and preparation method thereof

Abstract

The invention relates to a super-flexible travertine-like coating and a preparation method thereof. The super-flexible travertine-imitating coating comprises a coarse primer, a fine primer and a dispensing coating, the coarse primer comprises 80-120-mesh first colored sand, more than 200-mesh and less than 150-mesh first colored sand and 200-mesh first colored sand, and the weight ratio of the first colored sand to the first colored sand is (2.8-3): 1: (1.3-1.5); the fine primer comprises nano cellulose and second colored sand, the second colored sand has two particle sizes of more than 200 meshes and less than 150 meshes and 200 meshes, and the weight ratio of the second colored sand with the particle sizes of more than 200 meshes and less than 150 meshes to the second colored sand with the particle sizes of 200 meshes is (1.1-1.3): 1; the point material coating comprises nano cellulose. A coating obtained by the super-flexible travertine-imitating coating is high in initial flexibility and not prone to cracking, and certain rigidity can be kept in the later period.

Description

Technical Field

[0001] The present application relates to the field of architectural coatings, and in particular to an ultra-flexible travertine-like coating and a preparation method thereof. Background Art

[0002] With the abundance of materials, people's requirements for buildings are getting higher and higher. Among building materials, the most highly respected is the gorgeous and natural stone with good protective properties. However, due to the difficulty in transporting natural stone, the development of stone has a greater impact on the surrounding environment, heavy weight, high price, poor safety, acid rain resistance, and complex construction, which limits its development. As a result, imitation stone paint has emerged, which is a new type of paint that can simulate the texture and color of natural stone.

[0003] The imitation stone paint is based on acrylic resin emulsion and elastic resin solution. Through the reasonable proportion and color matching of white quartz sand and artificial calcined colored sand, it is sprayed with a high-pressure spray gun to present a rich imitation stone coating.

[0004] In view of the above-mentioned related technologies, the applicant found that the existing imitation stone coatings have problems such as poor imitation of stone, complex construction, single color, and need to use multiple spray guns if multiple colors are desired. In addition, the most serious problem is that in order to create a texture during the construction process, a certain thickness is required, and a spatula is needed to pull out grooves to shape the hole feeling of the travertine. In this way, the surface is uneven and more prone to fracture layers. If the thickness is too large, it is easy to cause the phenomenon of dry surface but not dry inside. After the external film is formed, the internal part slowly dries and shrinks, tearing and breaking the film that has already formed on the surface, and the overall anti-cracking performance is poor. Summary of the invention

[0005] In a first aspect, the present application provides an ultra-flexible travertine-like paint, which adopts the following technical solution.

[0006] A super-flexible travertine-like paint, comprising a coarse base paint, a fine base paint and a dot paint; The rough base coating comprises a rough base slurry, a first colored sand, a titanium dioxide slurry, a thickener, and water; the first colored sand comprises three particle sizes of greater than 120 mesh and less than 80 mesh, greater than 200 mesh and less than 150 mesh, and 200 mesh; the weight ratio of the first colored sand greater than 120 mesh and less than 80 mesh, greater than 200 mesh and less than 150 mesh, and 200 mesh is (2.8-3):1:(1.3-1.5); The fine base coating comprises fine surface slurry, second colored sand, thickener and water; the second colored sand comprises two particle sizes of greater than 200 mesh and less than 150 mesh and 200 mesh, and the weight ratio of the second colored sand greater than 200 mesh and less than 150 mesh to 200 mesh is (1.1-1.3):1; the fine surface slurry comprises nanocellulose, and the weight ratio of nanocellulose to the fine base coating is (1.8-2.2):100; The dotting material coating comprises a dotting material base paint, a dotting material granulation liquid and a dotting material continuous phase; the dotting material base paint and the dotting material continuous phase both comprise nanocellulose, the weight ratio of the nanocellulose in the dotting material base paint to the dotting material coating is (1.8-2.2):100, and the weight ratio of the nanocellulose in the dotting material continuous phase to the dotting material coating is nanocellulose (0.35-0.50):100.

[0007] By adopting the above technical scheme, the particle size of the first colored sand in the coarse primer is larger than the particle size of the second colored sand in the fine primer, that is, a structure of coarse primer and fine topcoat is formed, and the two are inlaid with each other, thereby improving the bonding performance between the primer and the topcoat, reducing the probability of cracking of the coating, and improving the flexibility of the coating.

[0008] In addition, nanocellulose is a kind of nano-level biomass material made by mechanical grinding and acid hydrolysis of wood cellulose microcrystalline particles, with natural, non-toxic, renewable characteristics, its main component is beta-glucan, is an important component of plant cell wall.Nanocellulose has a higher aspect ratio, about 1000:1, or even larger.This high aspect ratio gives nanocellulose unique properties and application potential.Nanocellulose is added in fine primer and dot coating in this application, on the one hand, the toughness of nanocellulose itself is conducive to improving the toughness of coating, on the other hand, the nanocellulose in matrix has water conductivity, in the process of coating drying, conduction moisture, moisture is guided from high content side to low content side, i.e., the moisture of inner layer is guided to outer layer, on the one hand, the drying of coating is accelerated, on the other hand, the phenomenon of drying outside and not drying inside can be avoided, it is ensured that the coating is dried inside and outside at the same time, and the internal film drying and shrinkage are avoided to tear and break the film that has not been thoroughly dried outside, and the probability of cracking of coating is reduced.

[0009] Further, based on the weight of the dot-based paint, the dot-based paint includes 310-320 parts of water, 0.5-1 parts of dispersant, 3.5-5 parts of defoamer, 28-33 parts of nanocellulose, 72-78 parts of calcined kaolin, 7-9 parts of cellulose, 3.5-4.5 parts of ethylene glycol, 5-7 parts of film-forming aid, 0.8-1.1 parts of multifunctional additive, 95-106 parts of emulsion, 3-4 parts of protective glue, 1.8-2.3 parts of fungicide, 0.2-0.5 parts of wetting agent, and 440-460 parts of third colored sand with a particle size greater than 200 mesh and less than 150 mesh; Based on the weight of the dot-feed granulation liquid, the dot-feed granulation liquid includes 965-975 parts of water, 2.8-3.4 parts of fungicide, 22-27 parts of protective glue, 1.2-1.3 parts of cellulose, 1.2-1.3 parts of xanthan gum, and 0.8-1.3 parts of multifunctional additive; In terms of the weight parts of the dot material continuous phase, the dot material continuous phase includes 140-150 parts of water, 3.2-4 parts of bactericide, 28-35 parts of nanocellulose, 0.4-0.6 parts of cellulose, 42-43 parts of film-forming aid, 23-27 parts of ethylene glycol, 1.3-1.7 parts of multifunctional aid, 740-760 parts of emulsion, and 3.7-3.8 parts of thickener; The weight ratio of the dot material base paint, the dot material granulation liquid and the dot material continuous phase is 67:18:15.

[0010] Further, based on the weight of the fine noodle slurry, the fine noodle slurry includes 310-320 parts of water, 1-2 parts of dispersant, 3.8-4.1 parts of defoamer, 48-53 parts of nanocellulose, 9-11 parts of bentonite, 7.3-7.7 parts of cellulose, 62-63 parts of heavy calcium, 187-188 parts of talc, 28-33 parts of ethylene glycol, 22-23 parts of film-forming aid, 1-2 parts of multifunctional aid, 295-305 parts of emulsion, 3.5-4.3 parts of bactericide, and 2.8-3.3 parts of thickener; Calculated by weight of the fine base coating, the fine base coating comprises 395-410 parts of fine surface slurry, 540-560 parts of second colored sand, 2.5-3.5 parts of thickener, and 45-50 parts of water.

[0011] Further, based on the weight of the coarse bottom slurry, the coarse bottom slurry includes 510-530 parts of water, 2.8-3.3 parts of defoaming agent, 9-10 parts of bactericide, 0.5-1.5 parts of dispersant, 4.6-5.2 parts of bentonite, 5.6-6.3 parts of suspending agent, 9-11 parts of lithium magnesium silicate, 23-28 parts of ethylene glycol, 12-13 parts of film-forming aid, 2.8-3.3 parts of multifunctional aid, 120-130 parts of heavy calcium, 48-55 parts of fourth colored sand, 220-230 parts of emulsion, and 2.8-3.2 parts of thickener; Calculated by weight of the rough base coating, the rough base coating includes 420-430 parts of rough base slurry, 550-560 parts of first colored sand, 8-12 parts of titanium dioxide slurry, 7-9 parts of thickener, and 1-3 parts of water.

[0012] By adopting the above technical solution, the raw materials of the coarse primer, the fine primer and the dot paint are limited, so that the three can penetrate each other and improve the initial toughness of the coating.

[0013] Furthermore, the particle size of heavy calcium in the fine surface slurry is 800 mesh, and the particle size of talcum powder is 800 mesh; the particle size of heavy calcium in the coarse bottom slurry is 400 mesh, and the particle size of the fourth colored sand is 200 mesh.

[0014] By adopting the above technical solution, it is beneficial to further strengthen the interlocking structure between the primer and the topcoat, improve the bonding performance between the primer and the topcoat, reduce the probability of cracking of the coating, and improve the flexibility of the coating.

[0015] Furthermore, the nanocellulose is modified nanocellulose, and the modification method is as follows: 1) dispersing nanocellulose in water to obtain a suspension; 2) Under stirring conditions, dropwise add the sodium dodecylbenzene sulfonate solution to the suspension obtained in 1) to obtain a reaction system, heat the reaction system to 40-50° C., control the pH value of the reaction system to 7-9, and stir the reaction for 1.5-2.5 hours; 3) After the reaction is completed, centrifuge, wash and dry to obtain modified nanocellulose.

[0016] The high aspect ratio of nanocellulose makes it easy to agglomerate in the coating matrix, and the bonding force with the coating matrix is ​​poor, which will have an adverse effect on the mechanical properties of the coating. By adopting the above technical solution, the surface of nanocellulose is modified by sodium dodecylbenzene sulfonate, and there are a large number of hydroxyl groups on the surface of nanocellulose. The hydrophilic end of sodium dodecylbenzene sulfonate is combined with these hydroxyl groups and wrapped outside the nanocellulose, that is, the hydrophilic end of sodium dodecylbenzene sulfonate is combined with the hydroxyl groups on the surface of nanocellulose, and the hydrophobic end faces the organic phase, which reduces the surface energy, improves the dispersion stability and compatibility, improves the bonding performance of nanocellulose with the coating matrix, and ensures the mechanical properties of the coating.

[0017] Furthermore, the weight ratio of the sodium dodecylbenzene sulfonate to the nanocellulose is 1:(3-4).

[0018] Furthermore, the concentration of the suspension is 0.2-0.5wt%, and the concentration of the sodium dodecylbenzene sulfonate solution is 0.4-0.8wt%.

[0019] Furthermore, the stirring speed is 400-600 r / min, and the dropping speed is 1-3 mL / min.

[0020] By adopting the above technical scheme, the ratio of sodium dodecylbenzene sulfonate to nanocellulose is controlled. There are a large number of hydroxyl groups on the surface of nanocellulose. The hydrophilic end of sodium dodecylbenzene sulfonate combines with these hydroxyl groups. If the dosage is too little, the surface of nanocellulose cannot be fully covered, and it is difficult to achieve a good modification effect; if the dosage is too much, it may cause the surfactant molecules to aggregate with each other, which will affect the modification effect and coating performance. In addition, the concentrations of sodium dodecylbenzene sulfonate solution and nanocellulose dispersion are limited, and the stirring speed during the reaction process is limited, so that the sodium dodecylbenzene sulfonate molecules are more likely to fully contact each nanocellulose particle, thereby improving the uniformity of the coating. That is, the modified nanocellulose prepared by the present application can achieve uniform coating of nanocellulose by sodium dodecylbenzene sulfonate, and improve its dispersibility and compatibility in the coating matrix.

[0021] In a second aspect, the present application provides a method for preparing an ultra-flexible travertine-like coating, using the following technical solution.

[0022] A method for preparing a super-flexible travertine-like coating comprises the following steps: S1. Preparation of rough primer Add the first colored sand to the coarse base slurry and mix evenly, then add the titanium dioxide slurry and mix evenly, finally add the thickener and water and mix evenly, and pack separately to obtain the coarse base coating; S2. Preparation of fine base coating Add the second colored sand to the fine surface slurry and mix evenly, then add the thickener and water and mix evenly, and package separately to obtain a fine base coating; S3. Preparation of dot coating Add the dot material base paint to the dot material granulation liquid, mix and then granulate, add the granulated material to the dot material continuous phase, mix evenly, and pack separately to obtain the dot material paint.

[0023] In summary, this application has the following beneficial effects: The present application forms a structure of coarse primer and fine topcoat by adding colored sand of different particle sizes to coarse primer and fine primer, and the two are mutually inlaid, so as to improve the bonding performance between primer and topcoat, reduce the probability of cracking of the coating, and improve the flexibility of the coating. At the same time, nanocellulose is added to both the fine primer and the dot coating. On the one hand, the toughness of the nanocellulose itself is conducive to improving the toughness of the coating. On the other hand, the nanocellulose in the matrix has water conductivity. During the drying process of the coating, the water is conducted and the water is guided from the high-content side to the low-content side, that is, the water of the inner layer is guided to the outer layer. On the one hand, the drying of the coating is accelerated, and on the other hand, the phenomenon of drying outside and not drying inside can be avoided. It is found that the coating is dried at the same time inside and outside, and the internal film is prevented from drying and shrinking, which will tear and break the film that has not been thoroughly dried outside, and reduce the probability of cracking of the coating. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with embodiments.

[0025] Raw materials and intermediate preparation examples raw material The raw materials in this application can be obtained from the market, see Table 1 for details: Table 1 Raw material sources ; ; ; ; Preparation Example Preparation Example 1 A modified nanocellulose, the preparation method of which is: 1) adding 350 kg of nanocellulose into deionized water, and using an ultrasonic processor to ultrasonically disperse the mixture to obtain a suspension with a concentration of 0.3 wt%; 2) Dissolve 100 kg of sodium dodecylbenzene sulfonate in water to obtain a sodium dodecylbenzene sulfonate solution with a concentration of 0.6 wt %. Add the sodium dodecylbenzene sulfonate solution dropwise to the suspension obtained in 1) at a rate of 2 mL / min under stirring at 500 r / min to obtain a reaction system. Heat the reaction system to 45° C., control the pH value of the reaction system to 8, and stir the reaction for 2 h. 3) After the reaction is completed, centrifuge, wash and dry to obtain modified nanocellulose.

[0026] Preparation Example 2 Different from Preparation Example 1, in step 1) of Preparation Example 2, 300 kg of nanocellulose was added to deionized water, and the mixed solution was ultrasonically dispersed using an ultrasonic processor to obtain a suspension with a concentration of 0.3 wt%.

[0027] Preparation Example 3 Different from Preparation Example 1, in step 2) of Preparation Example 3, 400 kg of nanocellulose was added to deionized water, and the mixed solution was ultrasonically dispersed using an ultrasonic processor to obtain a suspension with a concentration of 0.3 wt%.

[0028] Preparation Example 4 Different from Preparation Example 1, in step 1) of Preparation Example 4, 450 kg of nanocellulose was added to deionized water, and the mixed solution was ultrasonically dispersed using an ultrasonic processor to obtain a suspension with a concentration of 0.3 wt%.

[0029] Preparation Example 5 Different from Preparation Example 1, the concentration of the suspension in Preparation Example 5 is 0.2 wt %, and the concentration of the sodium dodecylbenzene sulfonate solution is 0.8 wt %.

[0030] Preparation Example 6 Different from Preparation Example 1, the concentration of the suspension in Preparation Example 6 is 0.5 wt %, and the concentration of the sodium dodecylbenzene sulfonate solution is 0.4 wt %.

[0031] Preparation Example 6 A titanium dioxide slurry, the preparation method of which is as follows: 1) Add 260kg water, 8kg dispersant, 2kg wetting agent, 3kg bactericide, 2kg defoamer and 15kg ethylene glycol to the mixing tank, stir at 400r / min until evenly mixed, then add 700kg titanium dioxide, increase the speed to 800r / min, rinse the tank wall with 5.2kg water, and stir for 8min; then add 3.8kg BR30000H, increase the speed to 1000r / min, high-speed disperse for 20 and stir for 5min; finally add 1kg KNE-905, increase the speed to 1300r / min, disperse for 20min, and inspect and package after passing.

[0032] Example Examples 1-3 A super-flexible travertine-like paint, the preparation method of which is as follows: S1. Preparation of rough primer According to the raw material ratio in Table 2, 10 kg of water was separated for standby use, and the remaining water was mixed with the defoamer, bactericide, and dispersant, and then bentonite, suspending agent, and lithium magnesium silicate were added in sequence, and each was added after an interval of 4 minutes, and stirred for 10 minutes after adding; then ethylene glycol, film-forming aid, and multifunctional aid were added and stirred for 15 minutes; then heavy calcium and snow white were added and dispersed with the reserved 10 kg of water; then the emulsion was added and mixed; finally, the thickener was added and mixed to obtain a coarse bottom slurry; Add the first colored sand to the coarse base slurry and mix evenly, then add the titanium dioxide slurry and mix evenly, finally add the thickener and water and mix evenly, and pack separately to obtain the coarse base coating; S2. Preparation of fine base coating According to the raw material ratio in Table 2, 10 kg of water was first separated for standby use, and the remaining water, dispersant, defoamer, nanocellulose, and bentonite were mixed and dispersed; then cellulose was added and dispersed for 3 minutes, and then heavy calcium, talcum powder, ethylene glycol, film-forming aid, and multifunctional aid were added and dispersed for 12 minutes; then fungicide was added and mixed; then the emulsion was added and mixed evenly; finally, a mixture of thickener and the reserved 10 kg of water was added and stirred for 5 minutes to obtain a fine noodle slurry; Add the second colored sand to the fine surface slurry and mix evenly, then add the thickener and water and mix evenly, and package separately to obtain a fine base coating; S3. Preparation of dot coating According to the proportions in Table 2, the protective glue is dispersed in 31.5 kg of water to obtain a protective glue dispersion; the remaining water, bactericide, dispersant, defoamer, nanocellulose, calcined kaolin, and cellulose are mixed and dispersed; then ethylene glycol, film-forming aid, and multifunctional aid are added and mixed; then the emulsion is added and mixed; then the protective glue dispersion is added and mixed; then the defoamer and wetting agent are added and mixed, and finally the snowflake white is added and mixed to obtain a spot material base paint; According to the proportions in Table 2, first take 500kg of water and mix it with the fungicide; then add protective gelatin, cellulose, and xanthan gum and disperse for 50 minutes; then add the multifunctional additive; finally, add the remaining water in sequence and mix to obtain the spot granulation liquid; According to the proportions in Table 2, the thickener is mixed with 4 kg of water to obtain a thickener solution; the remaining water is mixed with the bactericide; then nanocellulose is added to mix with cellulose; then a film-forming aid, ethylene glycol, and a multifunctional aid are added to mix; then the emulsion is added to mix; then the thickener solution is added to mix to obtain a continuous phase of the dot material; Add the dot material base paint to the dot material granulation liquid, mix and then granulate, add the granulated material to the dot material continuous phase, mix evenly, and pack separately to obtain the dot material paint.

[0033] Table 2 Raw material ratio table (kg) ; ; ; ; ; The first colored sand includes three particle sizes: larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh. The weight ratio of the first colored sand larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh is 2.9:1:1.4; the second colored sand includes two particle sizes: larger than 200 mesh and smaller than 150 mesh, and 200 mesh. The weight ratio of the second colored sand larger than 200 mesh and smaller than 150 mesh and 200 mesh is 1.2:1. The weight ratio of nanocellulose in the fine surface slurry to the fine base paint is 2:100; the weight ratio of nanocellulose in the dot base paint to the dot paint is 2:100, and the weight ratio of nanocellulose in the dot continuous phase to the dot paint is nanocellulose 0.45:100.

[0034] Example 4 Different from Example 2, in Example 4, the weight ratio of nanocellulose in the fine surface slurry to the fine base coating is 1.8:100; the weight ratio of nanocellulose in the dot base paint to the dot coating is 2.2:100, and the weight ratio of nanocellulose in the dot continuous phase to the dot coating is nanocellulose 0.4:100.

[0035] Example 5 Different from Example 2, in Example 5, the weight ratio of nanocellulose in the fine surface slurry to the fine base coating is 2.2:100; the weight ratio of nanocellulose in the dot base paint to the dot coating is 1.8:100, and the weight ratio of nanocellulose in the dot continuous phase to the dot coating is nanocellulose 0.5:100.

[0036] Example 6 Different from Example 2, the first colored sand in Example 6 includes three particle sizes: larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh, and the weight ratio of the first colored sand larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh is 3:1:1.3; the second colored sand includes two particle sizes: larger than 200 mesh and smaller than 150 mesh and 200 mesh, and the weight ratio of the second colored sand larger than 200 mesh and smaller than 150 mesh and 200 mesh is 1.1:1.

[0037] Example 7 Different from Example 2, the first colored sand in Example 7 includes three particle sizes: larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh, and the weight ratio of the first colored sand larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh is 2.8:1:1.5; the second colored sand includes two particle sizes: larger than 200 mesh and smaller than 150 mesh and 200 mesh, and the weight ratio of the second colored sand larger than 200 mesh and smaller than 150 mesh and 200 mesh is 1.3:1.

[0038] Embodiment 8-13 Different from Example 2, in Examples 8-13, the nanocellulose was replaced by the modified nanocellulose from Preparation Examples 1-6, respectively.

[0039] Comparative Example Comparative Example 1 Different from Example 1, the particle sizes of the first colored sand and the second colored sand in Comparative Example 1 are both 200 meshes.

[0040] Comparative Example 2 Different from Example 1, the first colored sand in Comparative Example 2 includes two particle sizes: larger than 200 mesh and smaller than 150 mesh and 200 mesh, and the weight ratio of the second colored sand larger than 200 mesh and smaller than 150 mesh and 200 mesh is 1.2:1; the second colored sand includes three particle sizes: larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh, and the weight ratio of the first colored sand larger than 120 mesh and smaller than 80 mesh, larger than 200 mesh and smaller than 150 mesh, and 200 mesh is 2.9:1:1.4.

[0041] Comparative Example 3 Different from Example 1, in Comparative Example 3, an equal amount of water was used to replace nanocellulose.

[0042] Performance Testing Preparation of coating samples: The rough primer is sprayed with a real stone paint spray gun, with a dosage of 1.5kg / ㎡, and can be dried for 24 hours before proceeding to the next process; The fine primer is sprayed with a real stone paint spray gun, with a dosage of 1.5kg / ㎡; Immediately after spraying, spray the spot paint, which is sprayed with a multi-color spray gun at a dosage of 0.5kg / ㎡; Immediately after spraying the spot material, smooth the surface with a spatula, spread the spot material into stripes, and create a sense of travertine holes. After drying for 48 hours, grind and polish, remove dust, and then apply the topcoat. After drying for 24 hours, it is completed.

[0043] The initial drying crack resistance and flexibility of the above coating samples were tested in accordance with "Multilayer Architectural Coatings" GBT9779-2015; the experimental wind speed in the initial drying crack resistance was 4-6m / s, the heat treatment time in the flexibility test was 8h and 10h, and the low temperature treatment time was 4h and 5h. The test results are shown in Table 3.

[0044] Table 3 Performance test results

[0045] Minor cracks refer to cracks with less than 3 cracks; obvious cracks refer to cracks with greater than or equal to 3 and less than 5 cracks; multiple cracks refer to cracks with greater than or equal to 5.

[0046] Combining Examples 1-13 and Comparative Examples 1-3, and combining Table 3, it can be seen that the coatings obtained in Examples 1-13 had no cracks when the initial drying crack resistance performance test was carried out at a wind speed of 4 m / s, and the coatings obtained in Examples 1-13 had no cracks when the flexibility test was carried out after heat treatment for 8 hours and low temperature treatment for 4 hours. Under the same working conditions, the coatings obtained in Comparative Examples 1-3 will produce cracks. This shows that the coatings obtained in the present application have better processing drying crack resistance and flexibility.

[0047] Combining Example 1 with Comparative Examples 1-3 and Table 3, it can be seen that the initial drying crack resistance and flexibility of the coating obtained in Example 1 are better than those of Comparative Examples 1-3. This may be because a coarse primer and a fine topcoat structure are formed in the present application, and the two are inlaid with each other, thereby improving the bonding performance between the primer and the topcoat, reducing the probability of cracking of the coating, and improving the flexibility of the coating; and nanocellulose has water conductivity. During the drying process of the coating, it conducts moisture and guides the moisture from the high-content side to the low-content side, that is, guides the moisture in the inner layer to the outer layer. On the one hand, it accelerates the drying of the coating, and on the other hand, it can avoid the phenomenon of drying outside and not drying inside. It is found that the coating ensures that the inside and outside are dried at the same time, and the internal film is prevented from drying and shrinking, tearing and breaking the external film that has not been completely dried, thereby further reducing the probability of cracking of the coating.

[0048] Combining Example 2 with Examples 8-13 and Table 3, it can be seen that the initial drying crack resistance and flexibility of the coatings obtained in Examples 8-13 are better than those in Example 2. This may be because the nanocellulose is surface-coated and modified with sodium dodecylbenzene sulfonate. There are a large number of hydroxyl groups on the surface of the nanocellulose. The hydrophilic end of the sodium dodecylbenzene sulfonate is combined with these hydroxyl groups and wrapped around the nanocellulose, that is, the hydrophilic end of the sodium dodecylbenzene sulfonate is combined with the hydroxyl groups on the surface of the nanocellulose, and the hydrophobic end faces the organic phase, which reduces the surface energy, improves the dispersion stability and compatibility, improves the bonding performance of the nanocellulose with the coating matrix, and ensures the mechanical properties of the coating.

[0049] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A super-flexible travertine-like paint, characterized in that: Including coarse primer, fine primer and spot paint; The rough base coating comprises a rough base slurry, a first colored sand, a titanium dioxide slurry, a thickener, and water; the first colored sand comprises three particle sizes of greater than 120 mesh and less than 80 mesh, greater than 200 mesh and less than 150 mesh, and 200 mesh; the weight ratio of the first colored sand greater than 120 mesh and less than 80 mesh, greater than 200 mesh and less than 150 mesh, and 200 mesh is (2.8-3):1:(1.3-1.5); The fine base coating comprises fine surface slurry, second colored sand, thickener and water; the second colored sand comprises two particle sizes of greater than 200 mesh and less than 150 mesh and 200 mesh, and the weight ratio of the second colored sand greater than 200 mesh and less than 150 mesh to 200 mesh is (1.1-1.3):1; the fine surface slurry comprises nanocellulose, and the weight ratio of nanocellulose to the fine base coating is (1.8-2.2):100; The dotting material coating comprises a dotting material base paint, a dotting material granulation liquid and a dotting material continuous phase; the dotting material base paint and the dotting material continuous phase both comprise nanocellulose, the weight ratio of the nanocellulose in the dotting material base paint to the dotting material coating is (1.8-2.2):100, and the weight ratio of the nanocellulose in the dotting material continuous phase to the dotting material coating is nanocellulose (0.35-0.50):

100.

2. The ultra-flexible travertine-like paint according to claim 1, characterized in that: Based on the weight of the dot-paint base paint, the dot-paint base paint includes 310-320 parts of water, 0.5-1 parts of dispersant, 3.5-5 parts of defoamer, 28-33 parts of nanocellulose, 72-78 parts of calcined kaolin, 7-9 parts of cellulose, 3.5-4.5 parts of ethylene glycol, 5-7 parts of film-forming aid, 0.8-1.1 parts of multifunctional aid, 95-106 parts of emulsion, 3-4 parts of protective glue, 1.8-2.3 parts of bactericide, 0.2-0.5 parts of wetting agent, and 440-460 parts of third colored sand with a particle size greater than 200 mesh and less than 150 mesh; Based on the weight of the dot-feed granulation liquid, the dot-feed granulation liquid includes 965-975 parts of water, 2.8-3.4 parts of fungicide, 22-27 parts of protective glue, 1.2-1.3 parts of cellulose, 1.2-1.3 parts of xanthan gum, and 0.8-1.3 parts of multifunctional additive; In terms of the weight parts of the dot material continuous phase, the dot material continuous phase includes 140-150 parts of water, 3.2-4 parts of bactericide, 28-35 parts of nanocellulose, 0.4-0.6 parts of cellulose, 42-43 parts of film-forming aid, 23-27 parts of ethylene glycol, 1.3-1.7 parts of multifunctional aid, 740-760 parts of emulsion, and 3.7-3.8 parts of thickener; The weight ratio of the dot material base paint, the dot material granulation liquid and the dot material continuous phase is 67:18:

15.

3. The ultra-flexible travertine-like paint according to claim 1, characterized in that: Based on the weight of the fine noodle slurry, the fine noodle slurry includes 310-320 parts of water, 1-2 parts of dispersant, 3.8-4.1 parts of defoamer, 48-53 parts of nanocellulose, 9-11 parts of bentonite, 7.3-7.7 parts of cellulose, 62-63 parts of heavy calcium, 187-188 parts of talc, 28-33 parts of ethylene glycol, 22-23 parts of film-forming aid, 1-2 parts of multifunctional aid, 295-305 parts of emulsion, 3.5-4.3 parts of bactericide, and 2.8-3.3 parts of thickener; Calculated by weight of the fine base coating, the fine base coating comprises 395-410 parts of fine surface slurry, 540-560 parts of second colored sand, 2.5-3.5 parts of thickener, and 45-50 parts of water.

4. The ultra-flexible travertine-like paint according to claim 3, characterized in that: Based on the weight of the coarse bottom slurry, the coarse bottom slurry includes 510-530 parts of water, 2.8-3.3 parts of defoaming agent, 9-10 parts of bactericide, 0.5-1.5 parts of dispersant, 4.6-5.2 parts of bentonite, 5.6-6.3 parts of suspending agent, 9-11 parts of lithium magnesium silicate, 23-28 parts of ethylene glycol, 12-13 parts of film-forming aid, 2.8-3.3 parts of multifunctional aid, 120-130 parts of heavy calcium, 48-55 parts of fourth colored sand, 220-230 parts of emulsion, and 2.8-3.2 parts of thickener; Calculated by weight of the rough base coating, the rough base coating includes 420-430 parts of rough base slurry, 550-560 parts of first colored sand, 8-12 parts of titanium dioxide slurry, 7-9 parts of thickener, and 1-3 parts of water.

5. The ultra-flexible travertine-like paint according to claim 4, characterized in that: The particle size of the heavy calcium in the fine surface slurry is 800 mesh, and the particle size of the talc powder is 800 mesh; the particle size of the heavy calcium in the coarse bottom slurry is 400 mesh, and the particle size of the fourth colored sand is 200 mesh.

6. The ultra-flexible travertine-like paint according to claim 1, characterized in that: The nanocellulose is modified nanocellulose, and the modification method is as follows: 1) dispersing nanocellulose in water to obtain a suspension; 2) Under stirring conditions, dropwise add the sodium dodecylbenzene sulfonate solution to the suspension obtained in 1) to obtain a reaction system, heat the reaction system to 40-50° C., control the pH value of the reaction system to 7-9, and stir the reaction for 1.5-2.5 hours; 3) After the reaction is completed, centrifuge, wash and dry to obtain modified nanocellulose.

7. The ultra-flexible travertine-like paint according to claim 6, characterized in that: The weight ratio of the sodium dodecylbenzene sulfonate to the nanocellulose is 1:(3-4).

8. The ultra-flexible travertine-like paint according to claim 6, characterized in that: The concentration of the suspension is 0.2-0.5 wt %, and the concentration of the sodium dodecylbenzene sulfonate solution is 0.4-0.8 wt %.

9. The ultra-flexible travertine-like paint according to claim 6, characterized in that: The stirring speed is 400-600 r / min, and the dropping speed is 1-3 mL / min.

10. A method for preparing the ultra-flexible travertine-like coating according to any one of claims 1 to 9, characterized in that The following steps are involved: S1. Preparation of rough primer Add the first colored sand to the coarse base slurry and mix evenly, then add the titanium dioxide slurry and mix evenly, finally add the thickener and water and mix evenly, and pack separately to obtain the coarse base coating; S2. Preparation of fine base coating Add the second colored sand to the fine surface slurry and mix evenly, then add the thickener and water and mix evenly, and package separately to obtain a fine base coating; S3. Preparation of dot coating Add the dot material base paint to the dot material granulation liquid, mix and then granulate, add the granulated material to the dot material continuous phase, mix evenly, and pack separately to obtain the dot material paint.

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