A water-in-sand coating material and a preparation method thereof

Abstract

The application discloses a kind of anti-bleeding water-in-sand coatings and preparation method thereof, belong to the technical field of exterior wall decorative coating, its technical scheme main point is a kind of anti-bleeding water-in-sand coatings, including the following weight parts of raw materials: base paint 550-650 parts, granulation liquid 200-300 parts, continuous phase 100-200 parts, the base paint includes water 296-336 parts, bactericide 2-5 parts, dispersing agent 1-3 parts, titanium white 5-8 parts, defoaming agent 3-5 parts, hydrophobic modified cellulose 3-5 parts, hydroxyethyl cellulose 4-5 parts, ethylene glycol 10-14 parts, film-forming aid 10-15 parts, multifunctional aid 1-2 parts, acrylic emulsion 160-200 parts, S482 protective glue 3-5 parts, wetting agent 0.1-0.2 parts, 80-120 mesh calcined color sand 420-460 parts, modified guar gum 1-3 parts, sodium tetraborate decahydrate 1-3 parts;The bactericide is composed of DMB long-acting bactericide and HF rapid bactericide, to improve the effect of the toughness of color particle in water-in-sand coatings.

Description

Technical Field

[0001] This invention relates to the field of exterior wall decorative coatings, and in particular to a waterproof, color-coated sand-coated coating and its preparation method. Background Technology

[0002] Water-based sand coating is a type of coating composed of water-based emulsion, sand, and additives. Its appearance and texture are similar to real stone paint, but the sand particles in water-based sand coating are smaller, resulting in a finer coating surface. Therefore, water-based sand coating is suitable for interior and exterior wall surfaces, columns, lines, and other decorations, and is especially suitable for application on flat or slightly flat surfaces.

[0003] Existing water-based sand-colored coatings mostly use color paste to coat white sand as colored particles. However, there are problems with using color paste for color matching: the color paste contains a lot of wetting agent. When matching darker colored particles, more color paste is added, resulting in more wetting agent being introduced. The increase in wetting agent will reduce the gelation of the colored particles and reduce their toughness. During the granulation process, the colored particles are prone to breakage, which will lead to color bleeding in the coating. Summary of the Invention

[0004] To address the problem of poor toughness of color particles in existing water-based sand coatings, this invention provides an anti-seepage colored water-based sand coating and its preparation method.

[0005] The present invention provides a water-based anti-seepage colored sand coating and its preparation method, which adopts the following technical solution:

[0006] A water-based sand-coated coating with anti-seepage properties comprises the following raw materials in parts by weight: 550-650 parts base paint, 200-300 parts granulation liquid, and 100-200 parts continuous phase. The base paint comprises 296-336 parts water, 2-5 parts bactericide, 1-3 parts dispersant, 5-8 parts titanium dioxide, 3-5 parts defoamer, 3-5 parts hydrophobically modified cellulose, 4-5 parts hydroxyethyl cellulose, 10-14 parts ethylene glycol, 10-15 parts film-forming aid, 1-2 parts multifunctional additive, 160-200 parts acrylic emulsion, 3-5 parts S482 protective colloid, 0.1-0.2 parts wetting agent, 420-460 parts 80-120 mesh calcined colored sand, 1-3 parts modified guar gum, and 1-3 parts sodium tetraborate decahydrate.

[0007] The bactericide consists of DMB long-acting bactericide and HF fast-acting bactericide.

[0008] By employing the above technical solution, hydrophobically modified cellulose, hydroxyethyl cellulose, and S482 protective colloid undergo a reaction, and the negative charge on the surface of S482 protective colloid interacts with the polar hydroxyl groups to form a gel cluster of a certain strength that is insoluble in water. The network structure between the gel clusters encapsulates the calcined colored sand, resulting in a gel layer on the outer surface of the calcined colored sand. The reaction between the acrylic emulsion and the S482 protective colloid increases the thickness of the gel layer, providing better protection for the calcined colored sand and preventing particle breakage during granulation. This gives the water-based sand coating excellent anti-bleeding properties. In addition, sodium tetraborate decahydrate combines with the hydroxyl groups on the modified guar gum molecular chain to form an interwoven, stable three-dimensional network structure, which can effectively improve the adhesion of the water-based sand coating and strengthen the network structure between the gel clusters, effectively enhancing the toughness of the colored particles.

[0009] Preferably, the modified guar gum is obtained by the following preparation method: S1: 35-45g of tetraethylene glycol is dissolved in 50ml of tetrahydrofuran, and 8-12g of sodium hydroxide is dissolved in 60ml of water to form an aqueous sodium hydroxide solution. The tetrahydrofuran solution containing tetraethylene glycol and the aqueous sodium hydroxide solution are mixed under ice bath conditions. Then, tetrahydrofuran containing toluene-4-sulfonyl chloride is added dropwise. The reaction is stirred in an ice bath for 3-4 hours. The reaction solution obtained is extracted with dichloromethane, and then dehydrated and filtered to obtain an activated tetraethylene glycol solution.

[0010] S2: Add 2-3g of guar gum to 3-4g of isopropanol and stir. Add 0.3-0.5g of sodium hydroxide at 25-30℃ for alkalization for 20-30 minutes. Then, add the activated tetraethylene glycol solution obtained in step S1 at 50-55℃ and react for 3-5 hours. Filter and dry to obtain modified guar gum.

[0011] Guar gum has a slow dissolution rate due to the hydrogen bonding within its molecules, and spherical micelles and bubbles appear during dissolution. However, by modifying guar gum using the above-mentioned technical solution, its hydrophilicity is increased, and the modification process improves the hydrogen bonding within the guar gum molecules, thus increasing the dissolution rate of the modified guar gum. Furthermore, after the modified guar gum is fully swollen, the molecular interactions and entanglement increase the intermolecular forces, resulting in better stability of the water-based sand coating. In addition, the three-dimensional spatial network structure formed by the reaction of modified guar gum with sodium tetraborate decahydrate has improved shear resistance, which can further prevent the colored sand particles from breaking during granulation.

[0012] Preferably, the calcined colored sand is obtained by the following preparation method: S1: 3-5 parts by weight of pigment are added to 15-25 parts by weight of an aqueous solution containing 10-20 wt% water-based superdispersant, and the pigment paste is obtained by ultrasonic dispersion;

[0013] S2: Add 8-10 parts by weight of aluminum dihydrogen phosphate and 0.3-0.5 parts by weight of boric acid to 100 parts by weight of quartz sand, then add the pigment paste obtained in step S1, stir evenly, and calcine at 600-700℃ for 3-5 hours to obtain calcined colored sand.

[0014] By adopting the above technical solution, after the pigment is dispersed by the water-based dispersant, the pigment is more completely coated on the surface of the natural sand and can adhere to the surface of the natural sand more evenly. In addition, the addition of aluminum dihydrogen phosphate can improve the bonding strength between the quartz sand and the pigment paste, reduce the probability of pigment falling off, and improve the wear resistance of the calcined colored sand.

[0015] Preferably, the hydrophobic modified cellulose comprises HE-10K hydrophobic modified cellulose and HM-10K hydrophobic modified cellulose in a weight ratio of 1:2.

[0016] By adopting the above technical solution, the hydrophobic modified cellulose, composed of HE-10K hydrophobic modified cellulose and HM-10K hydrophobic modified cellulose, can effectively improve the coating effect on calcined colored sand and reduce color bleeding.

[0017] Preferably, the granulation solution comprises, by weight, 1000 parts water, 1-2 parts long-lasting bactericide, 20-30 parts S80 protective colloid, 1-2 parts xanthan gum, 1-1.5 parts carboxymethyl cellulose, 1-2 parts multifunctional additive, and 1-2 parts rapid bactericide.

[0018] Preferably, the continuous phase comprises, by weight, 240-260 parts water, 1-2 parts long-acting bactericide, 25-35 parts nanocellulose, 1-2 parts Plus330 hydrophobically modified cellulose, 25-35 parts ethylene glycol, 25-35 parts film-forming aid, 1-2 parts multifunctional aid, 430-460 parts RS-3799A emulsion, 180-220 parts RS-3765 emulsion, 2-4 parts rapid bactericide, 2-3 parts thickener, and 10-30 parts silica sol.

[0019] By adopting the above technical solution, after adding silica sol to the continuous phase, the combined use of silica sol with cellulose and emulsion can form a more stable hardened protective layer on the surface of color particles with high density, thereby effectively improving the strength of water-based sand coatings.

[0020] A second aspect of the present invention is to provide a method for preparing a water-based sand-coated coating that prevents seepage, comprising the following steps:

[0021] S1: Preparation of base paint

[0022] S11: Mix S482 protective adhesive with some water and disperse it for 40-50 minutes at a speed of 1200±10r / min to form a protective adhesive solution with a concentration of 10%.

[0023] S12: Mix the remaining water, long-acting bactericide, dispersant, and defoamer at a speed of 300±10 r / min. Then, while stirring, add titanium dioxide, hydrophobically modified cellulose, and hydroxyethyl cellulose. Adjust the speed to 500±10 r / min and continue stirring for 5-10 min. Then, add ethylene glycol, film-forming aid, and multifunctional additive. Finally, adjust the speed to 1300 r / min and disperse for 5-15 minutes.

[0024] S13: Add acrylic emulsion to the solution obtained in step S12, reduce the speed to 800±10 r / min, and stir for 5-10 min;

[0025] S14: Add the protective colloid solution, modified guar gum, and sodium tetraborate decahydrate obtained in step S11 to the solution obtained in step S13, and then adjust the speed to 1200±10 r / min and disperse for 5-10 min.

[0026] S15: Add a rapid bactericide, a wetting agent and calcined colored sand to the solution obtained in step S14 to obtain a base paint;

[0027] S2: Mix the base paint with the granulation liquid and granulate to obtain colored particles;

[0028] S3: Add the continuous phase to step S2, stir and mix to obtain water-based sand coating.

[0029] Preferably, the granulation solution is prepared as follows: by weight, 500 parts of water and 1-2 parts of long-acting bactericide are stirred and mixed evenly. Under the condition of 800±10 r / min, 20-30 parts of S80 protective colloid, 1-2 parts of xanthan gum, and 1-1.5 parts of carboxymethyl cellulose are added. After dispersing for 5-10 minutes, 1-2 parts of multifunctional adjuvant are added. The speed is adjusted to 1300 r / min and dispersed for 35-45 minutes. Then, 1-2 parts of rapid bactericide and 500 parts of water are added. The speed is adjusted to 400 r / min and dispersed for 5 minutes to obtain the granulation solution.

[0030] Preferably, the preparation of the continuous phase is as follows: by weight, 240-260 parts of water and 1-2 parts of long-acting bactericide are mixed at a speed of 500 r / min, then 25-35 parts of nanocellulose and 1-2 parts of hydrophobic modified cellulose are added and stirred for 5-10 min, then 25-25 parts of ethylene glycol, 25-35 parts of film-forming aid, and 1-2 parts of multifunctional aid are added, the speed is adjusted to 1300 r / min and stirred for 10-20 min, then the speed is adjusted to 600 r / min, then 430-460 parts of RS-3799A emulsion, 180-220 parts of RS-3765 emulsion, 2-4 parts of rapid bactericide, 2-3 parts of thickener, and 10-30 parts of silica sol are added, and stirred for 5-10 minutes to obtain the continuous phase.

[0031] In summary, the present invention has the following beneficial effects: The addition of modified guar gum and sodium tetraborate decahydrate to the base paint of this application can strengthen the gel layer formed by the reaction of S482 protective colloid with cellulose and emulsion, improve the toughness of the color particles, thereby reducing the occurrence of broken particles in the granulation process of calcined colored sand, thus effectively ensuring the anti-bleeding performance of the water-based sand coating. In addition, the addition of silica sol in the continuous phase can enable the combined use of silica sol with cellulose and emulsion to form a more stable hardened protective layer on the surface of the color particles with high density, thereby effectively improving the strength and adhesion of the water-based sand coating. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments.

[0033] The raw materials used in the preparation examples, embodiments, and comparative examples of this application are all commercially available.

[0034] The dispersant was purchased from BASF, model N40;

[0035] The multi-functional adjuvant was purchased from Solvay, model MP380;

[0036] The long-lasting bactericide was purchased from Osada Chemicals, model DMB.

[0037] HE-10K hydrophobic modified cellulose was purchased from Ashland; HM-10K hydrophobic modified cellulose was purchased from Shandong Yunying.

[0038] The acrylic emulsion was purchased from Showa, Japan, model number AP-4765;

[0039] 80-120 mesh calcined colored sand was purchased from Shuangjiang, Guangdong.

[0040] RS-3799A emulsion and RS-3765 emulsion were both purchased from Badifu.

[0041] The thickener was purchased from Dow Chemical, model TT935;

[0042] The film-forming aid was purchased from Runtian Chemical.

[0043] The defoamer was purchased from Deqian, model AP7010;

[0044] Both S482 and S80 protective adhesives were purchased from Jiangsu Haimings.

[0045] Carboxymethyl cellulose was purchased from AkzoNobel, product number 4000G;

[0046] The modified guar gum was purchased from Wuhan Penglei Biotechnology Co., Ltd.

[0047] The silica sol was purchased from Aurun Chemical, model S308.

[0048] Preparation Example 1

[0049] The preparation method of modified guar gum includes the following preparation steps:

[0050] S1: Dissolve 35g of tetraethylene glycol in 50ml of tetrahydrofuran, and dissolve 8g of sodium hydroxide in 60ml of water to form an aqueous sodium hydroxide solution. Mix the tetrahydrofuran solution containing tetraethylene glycol and the aqueous sodium hydroxide solution under ice bath conditions. Then add tetrahydrofuran containing toluene-4-sulfonyl chloride dropwise, and keep the mixture stirred in an ice bath for 3 hours. Extract the reaction solution obtained from the reaction with dichloromethane, and then remove water and filter to obtain an activated tetraethylene glycol solution.

[0051] S2: Add 2g of guar gum to 3g of isopropanol and stir. Add 0.3g of sodium hydroxide at 25℃ for alkalization for 20 minutes. Then, add the activated tetraethylene glycol solution obtained in step S1 at 50℃ and react for 3 hours. Filter and dry to obtain modified guar gum.

[0052] Preparation Example 2

[0053] The preparation method of modified guar gum includes the following preparation steps:

[0054] S1: Dissolve 45g of tetraethylene glycol in 50ml of tetrahydrofuran, and dissolve 12g of sodium hydroxide in 60ml of water to form an aqueous sodium hydroxide solution. Mix the tetrahydrofuran solution containing tetraethylene glycol and the aqueous sodium hydroxide solution under ice bath conditions. Then add tetrahydrofuran containing toluene-4-sulfonyl chloride dropwise, and keep the mixture stirred in an ice bath for 4 hours. Extract the reaction solution obtained from the reaction with dichloromethane, and then remove water and filter to obtain an activated tetraethylene glycol solution.

[0055] S2: Add 3g of guar gum to 4g of isopropanol and stir. Add 0.5g of sodium hydroxide at 30℃ for 30 minutes to alkalize. Then, add the activated tetraethylene glycol solution obtained in step S1 at 55℃ and react for 5 hours. Filter and dry to obtain modified guar gum.

[0056] Preparation Example 3

[0057] The preparation method of calcined colored sand includes the following preparation steps:

[0058] S1: Add 3 kg of pigment to 15 kg of an aqueous solution containing 10 wt% water-based superdispersant, and disperse by ultrasonication to obtain a pigment paste; wherein the physical properties of the water-based superdispersant are: viscosity 98 mPa·s, pH 8.3, effective ingredient content 46±2%, and density 1.13 kg / m³. 3 ;

[0059] S2: Add 8 kg of aluminum dihydrogen phosphate and 0.3 kg of boric acid to 100 kg of quartz sand, then add the pigment paste obtained in step S1, stir evenly, and calcine at 600℃ for 3 hours to obtain calcined colored sand.

[0060] Preparation Example 4

[0061] The preparation method of calcined colored sand includes the following preparation steps:

[0062] S1: Add 5 kg of pigment to 25 kg of an aqueous solution containing 20 wt% water-based superdispersant, and disperse by ultrasonication to obtain a pigment paste; wherein the physical properties of the water-based superdispersant are: viscosity 98 mPa·s, pH 8.3, effective ingredient content 46 ± 2%, and density 1.13 kg / m³. 3 ;

[0063] S2: Add 10 kg of aluminum dihydrogen phosphate and 0.5 kg of boric acid to 100 kg of quartz sand, then add the pigment paste obtained in step S1, stir evenly, and calcine at 700℃ for 5 h to obtain calcined colored sand.

[0064] Example 1

[0065] A method for preparing a water-based, sand-coated, impermeable coating includes the following steps:

[0066] S1: Preparation of base paint

[0067] S11: Mix 3 kg of S482 protective adhesive with 27 kg of water and disperse for 40 minutes at a speed of 1200±10 r / min to form a protective adhesive solution with a concentration of 10%.

[0068] S12: Mix 269 kg of water, 0.7 kg of long-acting bactericide, 1 kg of dispersant, and 1.5 kg of defoamer at a speed of 300 ± 10 r / min. Then, while stirring, add 5 kg of titanium dioxide, 3 kg of hydrophobically modified cellulose, and 4 kg of hydroxyethyl cellulose. Adjust the speed to 500 ± 10 r / min and continue stirring for 5 minutes. Then, add 10 kg of ethylene glycol, 10 kg of film-forming aid, and 1 kg of multifunctional aid. Finally, adjust the speed to 1300 r / min and disperse for 5 minutes. The hydrophobically modified cellulose is composed of HE-10K hydrophobically modified cellulose and HM-10K hydrophobically modified cellulose in a weight ratio of 1:2.

[0069] S13: Add 160 kg of acrylic emulsion to the solution obtained in step S12, reduce the speed to 800 ± 10 r / min, and stir for 5 min;

[0070] S14: Add the protective colloid solution obtained in step S11, 1 kg of modified guar gum, and 1 kg of sodium tetraborate decahydrate to the solution obtained in step S13, and then adjust the rotation speed to 1200±10 r / min and disperse for 5 min.

[0071] S15: Add 1.5 kg of defoamer, 1.3 kg of rapid bactericide, 0.1 kg of wetting agent and 420 kg of calcined colored sand of 80-120 mesh to the solution obtained in step S14 to obtain the base paint;

[0072] S2: Preparation of granulation solution:

[0073] Mix 500 kg of water and 1 kg of long-acting bactericide evenly. Add 20 kg of S80 protective gel, 1 kg of xanthan gum, and 1 kg of carboxymethyl cellulose at a speed of 800 ± 10 r / min. After dispersing for 5 minutes, add 1 kg of multifunctional adjuvant, adjust the speed to 1300 r / min, and disperse for 35 minutes. Then add 1 kg of fast bactericide and 500 kg of water, adjust the speed to 400 r / min, and disperse for 5 minutes to obtain the granulation solution.

[0074] S3: Preparation of the continuous phase:

[0075] Mix 240 kg of water and 1 kg of long-acting bactericide at 500 rpm. Then add 25 kg of nanocellulose and 1 kg of Plus330 hydrophobic modified cellulose and stir for 5-10 minutes. Next, add 25 kg of ethylene glycol, 25 kg of film-forming aid, and 1 kg of multifunctional aid. Increase the speed to 1300 rpm and stir for 10 minutes. Then increase the speed to 600 rpm and add 430 kg of RS-3799A emulsion, 180 kg of RS-3765 emulsion, 2 kg of rapid bactericide, 2 kg of thickener, and 10 kg of silica sol. Stir for 5 minutes to obtain a continuous phase.

[0076] S4: Mix 550kg of base paint with 200kg of granulation liquid and granulate to obtain colored particles;

[0077] S5: Add 100kg of continuous phase to step S4, stir and mix to obtain water-based sand coating.

[0078] Example 2

[0079] A method for preparing a water-based, sand-coated, impermeable coating includes the following steps:

[0080] S1: Preparation of base paint

[0081] S11: Mix 4 kg of S482 protective adhesive with 36 kg of water and disperse for 40 minutes at a speed of 1200±10 r / min to form a protective adhesive solution with a concentration of 10%.

[0082] S12: Mix 280kg water, 1kg long-acting bactericide, 2kg dispersant, and 2kg defoamer at a speed of 300±10r / min. Then, while stirring, add 6.5kg titanium dioxide, 4kg hydrophobically modified cellulose, and 4kg hydroxyethyl cellulose. Adjust the speed to 500±10r / min and continue stirring for 5 minutes. Then, add 12kg ethylene glycol, 12kg film-forming aid, and 2kg multifunctional aid. Finally, adjust the speed to 1300r / min and disperse for 10 minutes. The hydrophobically modified cellulose is composed of HE-10K hydrophobically modified cellulose and HM-10K hydrophobically modified cellulose in a weight ratio of 1:2.

[0083] S13: Add 180 kg of acrylic emulsion to the solution obtained in step S12, reduce the speed to 800 ± 10 r / min, and stir for 10 min;

[0084] S14: Add the protective colloid solution obtained in step S11, 2 kg of modified guar gum, and 2 kg of sodium tetraborate decahydrate to the solution obtained in step S13, and then adjust the rotation speed to 1200±10 r / min and disperse for 10 min.

[0085] S15: Add 2kg of defoamer, 2kg of rapid bactericide, 0.1kg of wetting agent and 450kg of calcined colored sand of 80-120 mesh to the solution obtained in step S14 to obtain the base paint;

[0086] S2: Preparation of granulation solution:

[0087] Mix 500 kg of water and 2 kg of long-acting bactericide evenly. Add 25 kg of S80 protective gel, 1 kg of xanthan gum, and 1 kg of carboxymethyl cellulose at a speed of 800 ± 10 r / min. After dispersing for 5 minutes, add 1 kg of multifunctional adjuvant, adjust the speed to 1300 r / min, and disperse for 35 minutes. Then add 1 kg of fast bactericide and 500 kg of water, adjust the speed to 400 r / min, and disperse for 5 minutes to obtain the granulation solution.

[0088] S3: Preparation of the continuous phase:

[0089] 250 kg of water and 1 kg of long-acting bactericide were mixed at 500 rpm. Then, 30 kg of nanocellulose and 1 kg of Plus330 hydrophobic modified cellulose were added and stirred for 5 min. Next, 30 kg of ethylene glycol, 30 kg of film-forming aid, and 1 kg of multifunctional aid were added. The stirring speed was increased to 1300 rpm and the mixture was stirred and dispersed for 10 min. Then, the stirring speed was increased to 600 rpm, and 450 kg of RS-3799A emulsion, 200 kg of RS-3765 emulsion, 3 kg of rapid bactericide, 2 kg of thickener, and 20 kg of silica sol were added. After stirring and mixing for 5 min, a continuous phase was obtained.

[0090] S4: Mix 600 kg of base paint with 250 kg of granulation liquid and granulate to obtain colored particles;

[0091] S5: Add 150 kg of continuous phase to step S4, stir and mix to obtain water-based sand coating.

[0092] Example 3

[0093] A method for preparing a water-based, sand-coated, impermeable coating includes the following steps:

[0094] S1: Preparation of base paint

[0095] S11: Mix 5 kg of S482 protective adhesive with 45 kg of water and disperse for 40 minutes at a speed of 1200±10 r / min to form a protective adhesive solution with a concentration of 10%.

[0096] S12: Mix 291kg water, 1.7kg long-acting bactericide, 3kg dispersant, and 2.5kg defoamer at a speed of 300±10r / min. Then, while stirring, add 8kg titanium dioxide, 5kg hydrophobically modified cellulose, and 5kg hydroxyethyl cellulose. Adjust the speed to 500±10r / min and continue stirring for 10min. Then add 14kg ethylene glycol, 15kg film-forming aid, and 2kg multifunctional aid. Finally, adjust the speed to 1300r / min and disperse for 15min. The hydrophobically modified cellulose is composed of HE-10K hydrophobically modified cellulose and HM-10K hydrophobically modified cellulose in a weight ratio of 1:2.

[0097] S13: Add 200 kg of acrylic emulsion to the solution obtained in step S12, reduce the rotation speed to 800 ± 10 r / min, and stir for 10 min;

[0098] S14: Add the protective colloid solution obtained in step S11, 3 kg of modified guar gum, and 3 kg of sodium tetraborate decahydrate to the solution obtained in step S13, and then adjust the rotation speed to 1200±10 r / min and disperse for 10 min.

[0099] S15: Add 2.5 kg of defoamer, 3.3 kg of rapid bactericide, 0.2 kg of wetting agent and 460 kg of calcined colored sand of 80-120 mesh to the solution obtained in step S14 to obtain the base paint;

[0100] S2: Preparation of granulation solution:

[0101] Mix 500 kg of water and 2 kg of long-acting bactericide evenly. Add 30 kg of S80 protective gel, 2 kg of xanthan gum, and 1.5 kg of carboxymethyl cellulose at a speed of 800 ± 10 r / min. After dispersing for 5 minutes, add 2 kg of multifunctional adjuvant, adjust the speed to 1300 r / min, and disperse for 35 minutes. Then add 2 kg of fast bactericide and 500 kg of water, adjust the speed to 400 r / min, and disperse for 5 minutes to obtain the granulation solution.

[0102] S3: Preparation of the continuous phase:

[0103] 260 kg of water and 2 kg of long-acting bactericide were mixed at 500 rpm. Then, 35 kg of nanocellulose and 2 kg of Plus330 hydrophobic modified cellulose were added and stirred for 10 min. Next, 35 kg of ethylene glycol, 35 kg of film-forming aid, and 2 kg of multifunctional aid were added. The stirring speed was increased to 1300 rpm and the mixture was stirred and dispersed for 10 min. Then, the stirring speed was increased to 600 rpm, and 460 kg of RS-3799A emulsion, 220 kg of RS-3765 emulsion, 4 kg of rapid bactericide, 3 kg of thickener, and 50 kg of silica sol were added. After stirring and mixing for 10 minutes, a continuous phase was obtained.

[0104] S4: Mix 650kg of base paint with 300kg of granulation liquid and granulate to obtain colored particles;

[0105] S5: Add 200 kg of continuous phase to step S4, stir and mix to obtain water-based sand coating.

[0106] Example 4

[0107] A method for preparing a water-based anti-seepage sand coating differs from Example 2 in that, in step S14, an equal amount of the modified guar gum obtained in Preparation Example 1 is used, while all other steps are the same as in Example 2.

[0108] Example 5

[0109] A method for preparing a water-based anti-seepage colored sand coating differs from Example 2 in that, in step S14, an equal amount of the modified guar gum obtained in Preparation Example 2 is used, while all other steps are the same as in Example 2.

[0110] Example 6

[0111] A method for preparing a water-based anti-seepage colored sand coating differs from Example 4 in that, in step S15, an equal amount of the calcined colored sand obtained in Preparation Example 3 is used, while all other steps are the same as in Example 4.

[0112] Example 7

[0113] A method for preparing a water-based anti-seepage colored sand coating differs from Example 4 in that, in step S15, an equal amount of the calcined colored sand obtained in Example 4 is used, while all other steps are the same as in Example 4.

[0114] Example 8

[0115] A method for preparing a water-based sand-coated anti-seepage coating differs from Example 7 in that no silica sol is added to the continuous phase, while all other aspects are the same as in Example 7.

[0116] Comparative Example 1

[0117] A method for preparing a water-based sand-coated anti-seepage coating differs from Example 7 in that step S14 does not involve modified guar gum or sodium tetraborate decahydrate; all other steps are the same as in Example 7.

[0118] Comparative Example 2

[0119] A method for preparing a water-based anti-seepage sand coating differs from Example 7 in that no modified guar gum is used in step S14, while all other steps are the same as in Example 7.

[0120] Comparative Example 3

[0121] A method for preparing a water-based anti-seepage colored sand coating differs from Example 7 in that sodium tetraborate decahydrate is used in step S14, while all other steps are the same as in Example 7.

[0122] Comparative Example 4

[0123] A method for preparing a water-based anti-seepage colored sand coating differs from Example 7 in that, in step S14, an equal amount of guar gum is used instead of modified guar gum.

[0124] Performance testing

[0125] The adhesion and scrub resistance of the water-based sand coatings obtained in the above embodiments and comparative examples were tested. The water-based sand coatings obtained in the above embodiments and comparative examples were sprayed onto the test panels using a spray gun with a pressure of 0.5 MPa to see if any fragments would appear. The test results are shown in Table 1.

[0126] The scrub resistance was tested in accordance with the relevant provisions of HG / T4343-2012 "Waterborne Multicolor Architectural Coatings";

[0127] The adhesion test was conducted in accordance with the relevant provisions of GB / T9286-1998 "Cross-cut test for paint and varnish film", with grade 0 being the best and grade 5 being the worst.

[0128] Table 1. Test Results of Water-Based Sand Coating

[0129]

[0130]

[0131] As can be seen from the table above:

[0132] The water-based sand coating obtained in this application has good adhesion to the substrate, and can withstand more than 10,000 washes. After being sprayed at a pressure of 0.5 MPa, no fragments appeared, indicating that the color particles of this application have good toughness and the paint film surface also has excellent strength.

[0133] Compared with Example 7, when the base paint lacked modified guar gum and sodium tetraborate decahydrate, or lacked guar gum or sodium tetraborate decahydrate, the adhesion grade of the paint film decreased accordingly. Moreover, after being sprayed onto the test board, the color particles became fragmented, indicating that the color particles in the water-based sand coatings obtained in Comparative Examples 1-3 had poor toughness and the number of washes was also significantly reduced, indicating that the surface strength of the paint film decreased compared with Example 7.

[0134] Compared with Example 7, when guar gum was used instead of modified guar gum in Comparative Example 4, no fragmentation of the color particles occurred after spraying. However, the scrub resistance of the paint film decreased significantly compared with Example 7, indicating that the surface strength of the paint film decreased compared with Example 7.

[0135] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A stain blocking water in sand paint, characterized in that The raw materials include the following parts by weight: 550-650 parts base paint, 200-300 parts granulation liquid, and 100-200 parts continuous phase. The base paint includes 296-336 parts water, 2-5 parts bactericide, 1-3 parts dispersant, 5-8 parts titanium dioxide, 3-5 parts defoamer, 3-5 parts hydrophobically modified cellulose, 4-5 parts hydroxyethyl cellulose, 10-14 parts ethylene glycol, 10-15 parts film-forming aid, 1-2 parts multifunctional aid, 160-200 parts acrylic emulsion, 3-5 parts S482 protective colloid, 0.1-0.2 parts wetting agent, 420-460 parts calcined colored sand of 80-120 mesh, 1-3 parts modified guar gum, and 1-3 parts sodium tetraborate decahydrate. The bactericide is composed of DMB long-acting bactericide and HF fast-acting bactericide; The modified guar gum is obtained by the following preparation method: S1: 35-45g of tetraethylene glycol is dissolved in 50ml of tetrahydrofuran, and 8-12g of sodium hydroxide is dissolved in 60ml of water to form an aqueous sodium hydroxide solution. The tetrahydrofuran solution containing tetraethylene glycol and the aqueous sodium hydroxide solution are mixed under ice bath conditions. Then, tetrahydrofuran containing toluene-4-sulfonyl chloride is added dropwise. The reaction is stirred in an ice bath for 3-4 hours. The reaction solution obtained is extracted with dichloromethane, and then dehydrated and filtered to obtain an activated tetraethylene glycol solution. S2: Add 2-3g of guar gum to 3-4g of isopropanol and stir. Add 0.3-0.5g of sodium hydroxide at a temperature of 25-30℃ for alkalization for 20-30 minutes. Then, add the activated tetraethylene glycol solution obtained in step S1 at a temperature of 50-55℃ and react for 3-5 hours. Filter and dry to obtain modified guar gum. The calcined colored sand is obtained by the following preparation method: S1: 3-5 parts by weight of pigment are added to 15-25 parts by weight of an aqueous solution containing 10-20 wt% water-based superdispersant, and the pigment paste is obtained by ultrasonic dispersion. S2: Add 8-10 parts by weight of aluminum dihydrogen phosphate and 0.3-0.5 parts by weight of boric acid to 100 parts by weight of quartz sand, then add the pigment paste obtained in step S1, stir evenly, and calcine at 600-700℃ for 3-5 hours to obtain calcined colored sand. The granulation solution comprises, by weight, 1000 parts water, 1-2 parts long-lasting bactericide, 20-30 parts S80 protective colloid, 1-2 parts xanthan gum, 1-1.5 parts carboxymethyl cellulose, 1-2 parts multifunctional additive, and 1-2 parts rapid bactericide. The continuous phase comprises, by weight, 240-260 parts water, 1-2 parts long-lasting bactericide, 25-35 parts nanocellulose, 1-2 parts Plus330 hydrophobically modified cellulose, 25-35 parts ethylene glycol, 25-35 parts film-forming aid, 1-2 parts multifunctional aid, 430-460 parts RS-3799A emulsion, 180-220 parts RS-3765 emulsion, 2-4 parts rapid bactericide, 2-3 parts thickener, and 10-30 parts silica sol.

2. A stain-blocking sand in water coating according to claim 1, characterized in that: The hydrophobic modified cellulose includes HE-10K hydrophobic modified cellulose and HM-10K hydrophobic modified cellulose in a weight ratio of 1:

2.

3. A process for the preparation of the barrier anti-color sand-coat according to any one of claims 1-2, characterized by: Includes the following steps: S1: Preparation of base paint S11: Mix S482 protective adhesive with some water and disperse it for 40-50 minutes at a speed of 1200±10r / min to form a protective adhesive solution with a concentration of 10%. S12: Mix the remaining water, long-acting bactericide, dispersant, and defoamer at a speed of 300±10 r / min. Then, while stirring, add titanium dioxide, hydrophobically modified cellulose, and hydroxyethyl cellulose. Adjust the speed to 500±10 r / min and continue stirring for 5-10 min. Then, add ethylene glycol, film-forming aid, and multifunctional additive. Finally, adjust the speed to 1300 r / min and disperse for 5-15 minutes. S13: Add acrylic emulsion to the solution obtained in step S12, reduce the speed to 800±10 r / min, and stir for 5-10 min; S14: Add the protective colloid solution, modified guar gum, and sodium tetraborate decahydrate obtained in step S11 to the solution obtained in step S13, and then adjust the speed to 1200±10 r / min and disperse for 5-10 min. S15: Add a rapid bactericide, a wetting agent and calcined colored sand to the solution obtained in step S14 to obtain a base paint; S2: Mix the base paint with the granulation liquid and granulate to obtain colored particles; S3: Add the continuous phase to step S2, stir and mix to obtain water-based sand coating.

4. A process for the preparation of a water in sand stain blocking coating as claimed in claim 3, wherein: The granulation solution is prepared as follows: by weight, 500 parts of water and 1-2 parts of long-acting bactericide are stirred and mixed evenly. Under the condition of 800±10 r / min, 20-30 parts of S80 protective colloid, 1-2 parts of xanthan gum, and 1-1.5 parts of carboxymethyl cellulose are added. After dispersing for 5-10 minutes, 1-2 parts of multifunctional adjuvant are added. The speed is adjusted to 1300 r / min and dispersed for 35-45 minutes. Then, 1-2 parts of rapid bactericide and 500 parts of water are added. The speed is adjusted to 400 r / min and dispersed for 5 minutes to obtain the granulation solution.

5. The method for preparing a water-based anti-seepage colored sand coating according to claim 3, characterized in that: The preparation of the continuous phase is as follows: by weight, 240-260 parts of water and 1-2 parts of long-acting bactericide are mixed at a speed of 500 r / min. Then, 25-35 parts of nanocellulose and 1-2 parts of hydrophobic modified cellulose are added and stirred for 5-10 min. Then, 25-25 parts of ethylene glycol, 25-35 parts of film-forming aid, and 1-2 parts of multifunctional aid are added. The speed is adjusted to 1300 r / min and stirred for 10-20 min. Then, the speed is adjusted to 600 r / min and 430-460 parts of RS-3799A emulsion, 180-220 parts of RS-3765 emulsion, 2-4 parts of rapid bactericide, 2-3 parts of thickener, and 10-30 parts of silica sol are added and stirred for 5-10 minutes to obtain the continuous phase.

Images