A water-based scribbling multicolor paint and a preparation method thereof

Abstract

The application discloses scribbling water-based multicolor paint, which is prepared from the following raw materials in parts by weight: water-based emulsion, deionized water, color particles, scribbling modifier, dispersing agent, wetting agent, defoaming agent, thickening agent, film-forming aid, mildew-proof agent, nano-silica aerogel and alkaline pH regulator. The water-based emulsion is composed of silicone-acrylate emulsion and elastic emulsion at a mass ratio of 3-5:1. The color particles are prepared by granulating color paint and protective glue solution at a weight ratio of 1.5-2.5:1. The protective glue solution is prepared from deionized water, slip agent and magnesium lithium silicate. The paint has the advantages of multicolor three-dimensional decoration effect, low VOC, environmental protection, repeated active hand-drawing scribbling without trace, long-term storage stability of color particles without bleeding, high elasticity and resistance to repeated scrubbing, long-acting waterproof, mildew-proof and alkali-proof, substrate universality, strong adhesion and the like, and is suitable for the personalized wall painting requirements of civil household, campus and public space.

Description

Technical Field

[0001] This invention belongs to the field of water-based architectural coatings technology, specifically relating to a water-based multicolor paint that can be used for graffiti and its preparation method. Background Technology

[0002] With the personalization of home decoration, the popularization of children's aesthetic education, and the continuous growth of market demand for public interactive display walls, graffitiable wall paint and water-based multicolor imitation stone paint are the two mainstream wall decoration materials. However, the existing technical systems of the two types of products have performance incompatibilities, and the industry currently lacks an integrated single-component solution.

[0003] 1. Standard water-based monochrome graffiti whiteboard paint

[0004] Most commercially available water-based whiteboard graffiti paints are single-layer matte coatings, capable of producing only white or light gray monochrome finishes, lacking the three-dimensional, stone-like decorative effect of colored particles. Their formulas prioritize a smooth, easy-to-write surface, lacking waterproof, mildew-proof, and acid / alkali-resistant protection systems. When applied to humid environments such as kitchens, bathrooms, basements, and exterior walls in southern regions, the coating is prone to efflorescence, mold growth, chalking, and peeling. Furthermore, conventional graffiti paints use a single soft emulsion, resulting in insufficient mechanical elasticity of the paint film. After repeated wet rubbing, the surface of the paint film wears down, becomes mottled, and exposes the underlying substrate, leading to a short service life.

[0005] 2. Traditional water-based multi-colored imitation stone coating

[0006] Existing water-based multicolor paints rely on colored water-based base paints for color matching to achieve multicolor stone-like decorative effects. Their formulations focus solely on decoration and basic protection, lacking erasable functionality. The paint film has high porosity and surface tension, allowing water-based markers and watercolors to easily penetrate the film, leaving permanent marks after wiping with water or neutral detergents. Adding slippery surface additives to improve erasable performance damages the protective colloidal structure of the colored particles, directly causing issues like color bleeding, mixing, and paint delamination during storage. Furthermore, traditional multicolor paints use rigid emulsions for film formation; repeated rubbing and wiping cause the film to crack and colored particles to detach, making them unsuitable for frequent graffiti cleaning scenarios.

[0007] 3. Technical limitations of existing prior art documents

[0008] Patent CN112961561A discloses a water-based iridescent paint. The solution of this patent only has basic waterproof and passive anti-graffiti (resistance to the penetration of external stains) effects. It does not construct a surface modification system adapted to active hand-painting and erasing, and cannot support user-controlled graffiti and traceless erasing. The structure of the colored particle protective colloid is simple, and the pigment is prone to diffusion and bleeding during long-term storage, which limits the range of color mixing. It does not combine with elastic emulsion to improve the wear resistance and resilience of the paint film, and the paint film will be damaged after long-term wiping.

[0009] Patent CN101845260B discloses a fully water-based multicolor coating. This patent only optimizes the granulation and stabilization process of colored particles. The formulation system does not introduce graffiti-modifying functional components and does not have any pen-erasing function, so it cannot be used for interactive graffiti walls.

[0010] 4. Existing technological bottlenecks

[0011] Currently, the industry lacks an integrated water-based coating that can simultaneously achieve all of the following properties: colorful three-dimensional stone-like decoration, low VOC environmental protection, repeated hand-painted graffiti with no streaks after wiping with water, stable colored particles with no bleeding during long-term storage, high elasticity and resistance to repeated scrubbing, long-lasting waterproof, mildew-proof and alkali-resistant properties, and high adhesion to multiple substrates. Existing alternatives involve a two-layer, multi-coat application of "colorful primer + special graffiti topcoat," which is cumbersome, has poor interlayer adhesion, high overall construction costs, and is prone to peeling and delamination defects during on-site application, limiting its application scenarios. Summary of the Invention

[0012] In view of this, this application provides a water-based multicolor paint that can be graffitied and its preparation method. The paint has the advantages of colorful three-dimensional decorative effect, low VOC environmental protection, repeated active hand-painted graffiti that can be wiped without leaving a trace, stable color particles for long-term storage without bleeding, high elasticity and resistance to repeated scrubbing, long-lasting waterproof, mildew-proof and alkali-resistant, universal substrate compatibility, and strong adhesion. It is suitable for personalized wall coating needs in civil home decoration, campuses and public spaces.

[0013] To achieve the above objectives, this application employs the following technical solution:

[0014] A water-based multicolor paint suitable for graffiti is mainly prepared from the following components in the following weight ratios:

[0015] 35-45 parts of aqueous emulsion,

[0016] 7.6–30 parts deionized water

[0017] 30-35 parts of colored particles,

[0018] Apply 2-6 parts of paintable modifier.

[0019] Dispersant 0.2-0.4 parts,

[0020] Wetting agent 0.1-0.5 parts,

[0021] Defoamer 0.1-0.4 parts,

[0022] Thickener 0.3–1.0 parts,

[0023] Film-forming aid 1.5–2.0 parts,

[0024] 0.1–0.3 parts of antifungal agent,

[0025] 0.6–1.5 parts of nano-silica aerogel

[0026] 0.1–0.3 parts of alkaline pH adjuster;

[0027] The aqueous emulsion is composed of silicone-acrylic emulsion and elastic emulsion in a mass ratio of 3-5:1;

[0028] The colored particles are granulated from colored paint and protective adhesive solution at a weight ratio of 1.5-2.5:1;

[0029] The protective adhesive solution is mainly prepared from the following components in the following weight ratio: 93.8-94.9 parts deionized water, 0.1-0.2 parts slip agent, and 5-6 parts lithium magnesium silicate.

[0030] Among them, nano-silica aerogel has a porous hollow microstructure, which can form multiple synergistic effects with compounded water-based emulsions, graffiti modifiers, and slip agents: ① It fills the micropores inside the paint film, reduces the porosity of the paint film, blocks the penetration of water-based graffiti pigments into the paint film, reduces pen residue from the source, and helps improve the performance of traceless erasing; ② The aerogel particles are uniformly dispersed in the paint film to form a micro-support skeleton, which works with the elastic emulsion to offset the shear stress generated by repeated wiping, and improves the overall wear resistance and crack resistance of the paint film. Yes, it can extend the scrub resistance life; ③ The porous structure can adsorb trace amounts of free water and alkaline ions in the system, and together with lithium magnesium silicate protective glue, it can reduce the diffusion rate of pigment particles, inhibit pigment bleeding and storage stratification; ④ Combined with the silicon-oxygen bond structure of silicone-acrylic emulsion, it can synergistically improve the coating's water resistance, acid and alkali resistance, and alkali resistance, and improve the protective effect in humid environments such as kitchens, bathrooms, and basements; ⑤ The low-density porous structure of aerogel can reduce the overall film-forming shrinkage stress of the coating, reduce micro-cracks in the paint film after construction, and improve the smoothness and three-dimensional texture of the coating.

[0031] The protective colloid forms a dense, hydrated, isolating protective layer on the surface of the colored particles, blocking the inter-diffusion of pigments from different water-based color pastes and inhibiting color bleeding at its source. Simultaneously, it prevents the paintable modifier from directly contacting the colored particles, avoiding swelling and damage to the protective layer. This invention employs a silicone-acrylic emulsion + elastic emulsion composite film-forming system, synergistically improving the elasticity, abrasion resistance, and substrate adhesion of the paint film. Even after multiple wet rubbings, the paint film shows no cracking, powdering, loss of gloss, or colored particle detachment. This invention constructs a magnesium-lithium silicate composite protective colloid to encapsulate the colored particles, preventing pigment diffusion across particles, solving defects such as colored particle bleeding, storage delamination, and color mixing during application, and extending the stability period of the coating at room temperature.

[0032] The coating of this invention is a single-component, water-based, multi-color coating. A single coat can simultaneously achieve a multi-colored, three-dimensional stone-like decoration without on-site mixing. It has a storage stability period of ≥12 months. After the paint film forms, it can be repeatedly written on with water-based markers and watercolors. Within 24 hours of writing, wiping with water or neutral detergent will leave no pen marks, no loss of gloss, and no color particle peeling, eliminating the need for a double-layer application of primer and topcoat. Furthermore, the entire formula of this invention is free of aromatic hydrocarbons and high-boiling-point ester solvents, and the VOC content is far below the national standard limit, making it suitable for high environmental protection requirements such as children's rooms and enclosed indoor spaces.

[0033] Preferably, the room temperature Brinell viscosity of the silicone-acrylic emulsion is 100–1500 (cps, 25℃, rotor No. 3, 60 r / min), and the minimum film-forming temperature is 40 ± 2 °C; the room temperature Brinell viscosity of the elastic emulsion is 400–3600 (cps, 25℃, rotor No. 3, 30 r / min), and the minimum film-forming temperature is <0 °C. The silicone-acrylic emulsion has the advantages of water and weather resistance, while the elastic emulsion can improve the resilience of the paint film. The synergistic effect of the two is that the silicone-acrylic emulsion provides the coating with basic waterproof, alkali-resistant, and outdoor weather-resistant properties, while the elastic emulsion counteracts the frictional shear stress generated by repeated wiping, synergistically preventing the paint film from cracking, chalking, and breaking.

[0034] Preferably, the colored paint is made by mixing a white base paint with a water-based colorant;

[0035] The white base paint is mainly composed of the following components in the following weight ratios: 38.5-56.9 parts deionized water, 0.8-1.2 parts hydroxyethyl cellulose, 0.1-0.3 parts dispersant, 0.1-0.3 parts wetting agent, 0.1-0.3 parts alkaline pH adjuster, 0.1-0.3 parts mildew inhibitor, 0.2-0.5 parts defoamer, 1.2-1.6 parts film-forming aid, 1.5-2 parts titanium dioxide, 2-5 parts calcined kaolin, 30-40 parts of the aqueous emulsion, and 7-10 parts of the protective colloid solution.

[0036] The water-based emulsion contained in the main components of the white base paint is the same as the water-based emulsion contained in the main components of the water-based multicolor paint that can be painted. The protective adhesive solution contained in the main components of the white base paint is the same as one of the protective adhesive solutions in the components of the colored particles.

[0037] Preferably, the preparation method of the white base paint includes the following steps: weighing deionized water, hydroxyethyl cellulose, dispersant, wetting agent, alkaline pH adjuster, antifungal agent, defoamer, film-forming aid, titanium dioxide and calcined kaolin according to the formula, adding them to a dispersion tank, controlling the rotation speed at 800-1200 r / min, high-speed dispersion for 20-30 min until the material fineness is <50 μm, then adding aqueous emulsion and protective colloid solution, controlling the rotation speed at 200-400 r / min, stirring for 5-10 min to obtain the white base paint.

[0038] Preferably, the preparation method of the protective adhesive solution includes the following steps: weighing deionized water, slip agent and lithium magnesium silicate according to the formula, placing them in a disperser, and dispersing them at high speed for 20-30 minutes at a speed of 800-1200 r / min until all components are completely dissolved to obtain the protective adhesive solution.

[0039] Preferably, the graffiti-friendly modifier is a polyether-modified polysiloxane, with hydrophilic polyethers (EO-terminated) at both ends of its molecule. This allows for easy dispersion in water-based coatings and water-based resin emulsions, providing significant slip enhancement, scratch resistance, anti-blocking, and anti-graffiti effects, while also exhibiting excellent leveling and wetting properties. This preferred graffiti-friendly modifier is uniformly distributed on the paint film surface, precisely controlling the surface tension of the paint film and balancing the clarity of water-based pigment writing with the wiping and peeling properties of the ink: it enhances the spreadability of water-based pigments during writing, resulting in clear lettering; during wiping, it weakens the interfacial bonding between the pigment and the paint film, allowing the ink to be easily peeled off with water. Furthermore, this graffiti-friendly modifier does not damage the pigment particle structure or the overall paint film.

[0040] Preferably, the dispersant is an ammonium salt dispersant, which can effectively disperse colored particles and powder raw materials and prevent them from agglomerating;

[0041] The wetting agent is a nonionic wetting agent, which can improve the wetting performance of the coating on various substrates, thereby enhancing the adhesion between the coating and the substrate.

[0042] The defoamer is an organosilicon defoamer, which can effectively eliminate bubbles generated during the preparation and application of the coating, ensuring a smooth and even coating surface.

[0043] The thickener is a polyurethane thickener, which can flexibly adjust the viscosity of the coating by changing the amount added, making it easier to apply and improving the storage stability of the coating.

[0044] The film-forming aid is dodecyl alcohol ester, which can effectively reduce the film-forming temperature of the emulsion and improve the density and abrasion resistance of the coating.

[0045] The antifungal agent is an isothiazolinone antifungal agent, which has excellent antifungal and antibacterial properties and can effectively prevent the coating from growing mold in a humid environment.

[0046] The alkaline pH adjuster is ammonia water. This alkaline pH adjuster can adjust the pH value of the coating to 8-9, ensuring the stable coexistence of all components of the water-based emulsion, protective adhesive solution and paintable modifier (polyether modifier) ​​without flocculation or stratification.

[0047] The titanium dioxide is rutile titanium dioxide.

[0048] Preferably, the slip agent is silicone-modified polyethylene wax micro powder, which can be evenly distributed on the paint film surface to form a lubricating film, reduce friction loss from repeated wiping, and significantly increase the number of scrub resistance cycles; at the same time, it can form a double-layer easy-to-wipe interface with the graffiti modifier, achieving double the easy removal of pen marks.

[0049] This application also provides a method for preparing the above-mentioned water-based multicolor paint that can be used for graffiti, comprising the following steps:

[0050] (1) Preparation of colored paint: According to the required color, the white base paint is mixed with the corresponding water-based color paste to obtain the colored paint of various colors;

[0051] (2) Preparation of colored particles: According to the mixing weight ratio of colored paint to protective adhesive solution of 1.5-2.5:1, the colored paint prepared in step (1) is mixed with the protective adhesive solution, and the rotation speed is controlled at 200-300r / min for granulation. After granulation for 5-8 minutes, the desired colored particles are obtained.

[0052] (3) Preparation of water-based multicolor paint for graffiti: Weigh out deionized water, water-based emulsion, dispersant, wetting agent, defoamer, film-forming aid, mildew inhibitor, nano silica aerogel and alkaline pH adjuster according to the formula, place them in a disperser, stir for 10-15 minutes at a speed of 300-500 r / min until they are evenly mixed, add thickener, continue stirring for 5-8 minutes, add colored particles and graffiti modifier, control the speed at 100-200 r / min, stir for 8-12 minutes to ensure that the colored particles are evenly dispersed and do not agglomerate, and after stirring evenly, the water-based multicolor paint for graffiti is obtained.

[0053] This invention relates to a water-based multicolor paint suitable for graffiti, featuring a low-shear gradient speed and gentle granulation process. The granulation stage protects the integrity of the colored particles, resulting in a finished product that can be applied by roller, spray, or trowel. It exhibits excellent direct adhesion to concrete, gypsum board, solid wood, and metal sheets. Furthermore, this invention eliminates the need for double-layer composite coatings, simultaneously achieving both stone-like decoration and traceless graffiti functionality. This invention solves the following technical problems: balancing the stability of the colored particle system with the paint film's erasable and writeable properties, overcoming multiple technical contradictions such as the limited decorative appeal of monochrome graffiti paints, the lack of erasable functionality in traditional multicolor paints, the tendency for colored particles to bleed, the susceptibility of the paint film to friction damage, insufficient protection in humid environments, and a narrow range of applicable substrates.

[0054] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0055] (1) Excellent environmental performance: The present invention adopts an all-water-based formulation design, uses deionized water as the dispersion medium, does not contain harmful solvents, is an all-water phase dispersion system, is free of aromatic hydrocarbons and heavy esters, and has a VOC content ≤12 g / L, which is far below the national standard; it has no irritating volatile odor and can be widely used in homes, children's rooms and other scenarios with high environmental protection requirements.

[0056] (2) Combining colorful decorative properties and graffitiability: This invention isolates the graffiti modifier from damaging the colored particles through lithium magnesium silicate protective glue, while polyether-modified polysiloxane regulates the surface tension of the paint film, achieving the coexistence of two mutually exclusive properties: the colored particles can be freely matched to form a stone-like three-dimensional texture; the water-based pen can completely remove the pen marks by wiping with water within 24 hours, and the paint film still has no blooming, exposed base, or colored particles falling off after more than 10,000 scrub resistance tests, overcoming the defects of conventional multi-colored paints that cannot be erased and single-color graffiti paints that lack three-dimensional decoration.

[0057] (3) Excellent stability and construction performance: The present invention uses a compound system of silicone acrylic emulsion and elastic emulsion, combined with a special protective adhesive solution to prepare colored particles. The finished product does not separate, bleed, or agglomerate after 12 months of storage at room temperature. The coating viscosity is moderate and can be applied by roller brush, spraying and other construction methods. The construction is convenient and efficient, with good film-forming properties. The coating surface is flat and smooth, without construction defects such as bubbles and sagging.

[0058] (4) Outstanding protective performance: The silicone-acrylic emulsion and elastic emulsion compound system used in this invention enhances the elasticity and wear resistance of the coating, making it less prone to damage during graffiti cleaning and extending its service life. The addition of slip agent further improves the abrasion resistance of the coating. Water resistance test verifies that the coating does not blister, whiten, or peel off after being soaked in water for 5-14 weeks. At a paint film thickness of 150μm, it can withstand acid and alkali immersion for 450-550 hours without corrosion or loss of gloss. The isothiazolinone anti-mildew system has an anti-mildew level of 0-1, and does not mold in humid environments such as high humidity in the south, basements, kitchens and bathrooms. The elastic emulsion offsets frictional stress, making it less prone to damage after long-term scrubbing and extending the service life of the wall.

[0059] (5) Strong adhesion and wide range of applications: The coating has a dry adhesion of 0 to 1 on concrete cement mortar, gypsum board, solid wood board and metal anti-rust board, and can be applied directly without the need for a special primer; it can be used on the interior and exterior walls of buildings, children's interactive rooms, school graffiti walls, shopping mall cultural and creative display walls and cultural tourism public interactive walls, simplifying the construction process and reducing the overall coating cost. Detailed Implementation

[0060] The exemplary embodiments of the present invention are described in more detail below. These embodiments are intended to provide a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art. While exemplary embodiments of the present invention are shown, it should be understood that the invention should not be limited to the embodiments set forth herein.

[0061] The raw material source information for the following embodiments is as follows:

[0062] Silicone-acrylic emulsion: Badifu RS-8792;

[0063] Elastic emulsion: Badifu RS-9689AT;

[0064] Ammonium salt dispersant: Dow 1124;

[0065] Nonionic wetting agent: Clariant LCN 070;

[0066] Silicone-based defoamer: BYK-024;

[0067] Polyurethane thickener: Hemings Rheolate 278;

[0068] Film-forming aid: dodecyl alcohol ester (Eastman alcohol ester 12);

[0069] Isothiazolinone antifungal agent: Tol Acticide® MBS;

[0070] Organosilicon-modified polyethylene wax micro powder: Clariant 3920F;

[0071] Lithium magnesium silicate: Fenghong S482;

[0072] Rutile titanium dioxide: DuPont R-902;

[0073] Calcined kaolin: 1250 mesh calcined kaolin from Jinyang, Shanxi;

[0074] Hydroxyethyl cellulose: Aslan HS30000YP2;

[0075] Graffiti-friendly modifier: Beijing Baiyuan Chemical BY-9330;

[0076] Nano-silica aerogel: Cabot ENOVA IC3100 (USA);

[0077] Red / Black / Yellow Water-based Pigments: Clariant Water-based Pigment Series: Iron Red B130-CN, Iron Yellow R132-CN, Carbon Black Black N131;

[0078] Ammonia water: Jiangsu Surong New Materials Co., Ltd., 25% industrial grade ammonia water.

[0079] Example 1

[0080] A water-based multicolor paint suitable for graffiti is mainly prepared from the following components in the following weight ratios: 35 parts water-based emulsion, 30 parts deionized water, 30 parts colored particles, 2 parts graffiti modifier, 0.2 parts dispersant, 0.1 parts wetting agent, 0.1 parts defoamer, 0.3 parts thickener, 1.5 parts film-forming aid, 0.1 parts mildew inhibitor, 0.6 parts nano-silica aerogel, and 0.1 parts alkaline pH adjuster;

[0081] The colored particles are made by granulation of colored paint and protective adhesive solution at a weight ratio of 1.5:1;

[0082] The protective adhesive solution is mainly prepared from the following components in the following weight ratio: 94.9 parts deionized water, 0.1 parts slip agent, and 5 parts lithium magnesium silicate;

[0083] The colored paint is made by mixing white base paint with water-based color paste;

[0084] The white base paint is mainly composed of the following components in the following weight ratios: 56.9 parts deionized water, 0.8 parts hydroxyethyl cellulose, 0.1 parts dispersant, 0.1 parts wetting agent, 0.1 parts alkaline pH adjuster, 0.1 parts mildew inhibitor, 0.2 parts defoamer, 1.2 parts film-forming aid, 1.5 parts titanium dioxide, 2.0 parts calcined kaolin, 30 parts water-based emulsion, and 7.0 parts protective colloid solution;

[0085] In this embodiment, the aqueous emulsion is composed of silicone-acrylic emulsion and elastic emulsion in a mass ratio of 3:1. The paintable modifier is polyether-modified polysiloxane; the dispersant is an ammonium salt dispersant; the wetting agent is a nonionic wetting agent; the defoamer is an organosilicon defoamer; the thickener is a polyurethane thickener; the film-forming aid is dodecyl alcohol ester; the mildew inhibitor is an isothiazolinone mildew inhibitor; the alkaline pH adjuster is ammonia water; the slip agent is organosilicon-modified polyethylene wax micro powder; and the titanium dioxide is rutile titanium dioxide.

[0086] The preparation method of this water-based multicolor paint that can be used for graffiti is as follows:

[0087] (1) Preparation of protective adhesive solution: Weigh deionized water, slip agent and lithium magnesium silicate according to the formula, place them in a disperser, and disperse them at a high speed of 800 r / min for 20 min until all components are completely dissolved to obtain the protective adhesive solution.

[0088] (2) Preparation of white base paint: Weigh out deionized water, hydroxyethyl cellulose, dispersant, wetting agent, alkaline pH adjuster, mildew inhibitor, defoamer, film-forming aid, titanium dioxide and calcined kaolin according to the formula, add them to the dispersion tank, disperse at high speed of 800 r / min for 20 min until the fineness of the material is <50 μm, then add water emulsion and the protective colloid solution prepared in step (1), stir at 200 r / min for 5 min to obtain white base paint;

[0089] (3) Preparation of colored paint: According to the required color, the white base paint obtained in step (2) is mixed with red, black and yellow water-based color pastes to make colored paints of various colors.

[0090] (4) Preparation of colored particles: According to the mixing weight ratio of colored paint to protective adhesive solution of 1.5:1, the colored paint obtained in step (3) and the protective adhesive solution obtained in step (1) are mixed and granulated at a speed of 200r / min. After granulation for 5 minutes, colored particles with a particle size of 1-5mm are obtained.

[0091] (5) Preparation of water-based multicolor paints suitable for graffiti:

[0092] Weigh out the deionized water, water-based emulsion, dispersant, wetting agent, defoamer, film-forming aid, mildew inhibitor, nano silica aerogel and alkaline pH adjuster according to the formula, place them in a disperser, and stir at a low speed of 300 r / min for 10 min until all components are mixed evenly. Then add the thickener and continue stirring for 5 min. Then add the colored particles and graffiti modifier obtained in step (4) and stir at a speed of 100 r / min for 8 min to ensure that the colored particles are evenly dispersed and do not agglomerate. After stirring evenly, the graffiti-friendly water-based multicolor paint is obtained.

[0093] Performance testing: The VOC content of this coating is ≤10g / L, which meets the requirements of the national standard (GB 30981.1-2025 Limits of Hazardous Substances in Coatings Part 1: Architectural Coatings); graffiti can be completely removed by wiping with water for 30 seconds without leaving any residue or damage to the coating; the colored particles are evenly dispersed, and the finished product does not separate, bleed, or agglomerate after 12 months of storage at room temperature; the coating adhesion is Grade 1 (GB / T 9286 Cross-cut test for paint and varnish film); it withstands water immersion for 8 weeks without blistering, whitening, peeling, or loss of gloss; the 150μm thick coating can withstand acid and alkali for up to 480 hours; the mildew resistance is Grade 0; the waterproof rating is IP65; and the paint film shows no signs of blooming, substrate exposure, or colored particle peeling after more than 10,000 scrub tests.

[0094] Example 2

[0095] A water-based multicolor paint suitable for graffiti is mainly prepared from the following components in the following weight ratios: 45 parts water-based emulsion, 7.6 parts deionized water, 35 parts colored particles, 6 parts graffiti modifier, 0.4 parts dispersant, 0.5 parts wetting agent, 0.4 parts defoamer, 1 part thickener, 2 parts film-forming aid, 0.3 parts mildew inhibitor, 1.5 parts nano-silica aerogel, and 0.3 parts alkaline pH adjuster;

[0096] The colored particles are made by granulation of colored paint and protective adhesive solution in a weight ratio of 2:1;

[0097] The protective adhesive solution is mainly prepared from the following components in the following weight ratio: 93.8 parts deionized water, 0.2 parts slip agent, and 6 parts lithium magnesium silicate;

[0098] The colored paint is made by mixing white base paint with water-based color paste;

[0099] The white base paint is mainly composed of the following components in the following weight ratios: 38.5 parts deionized water, 1.2 parts hydroxyethyl cellulose, 0.3 parts dispersant, 0.3 parts wetting agent, 0.3 parts alkaline pH adjuster, 0.3 parts mildew inhibitor, 0.5 parts defoamer, 1.6 parts film-forming aid, 2 parts titanium dioxide, 5 parts calcined kaolin, 40 parts water-based emulsion, and 10 parts protective colloid solution;

[0100] In this embodiment, the aqueous emulsion is composed of silicone-acrylic emulsion and elastic emulsion in a mass ratio of 5:1. The paintable modifier is polyether-modified polysiloxane; the dispersant is an ammonium salt dispersant; the wetting agent is a nonionic wetting agent; the defoamer is an organosilicon defoamer; the thickener is a polyurethane thickener; the film-forming aid is dodecyl alcohol ester; the mildew inhibitor is an isothiazolinone mildew inhibitor; the alkaline pH adjuster is ammonia water; the slip agent is organosilicon-modified polyethylene wax micro powder; and the titanium dioxide is rutile titanium dioxide.

[0101] The preparation method of this water-based multicolor paint that can be used for graffiti is as follows:

[0102] (1) Preparation of protective adhesive solution: Weigh deionized water, slip agent and lithium magnesium silicate according to the formula, place them in a disperser, and disperse them at a high speed of 1200 r / min for 30 min until all components are completely dissolved to obtain the protective adhesive solution.

[0103] (2) Preparation of white base paint: Weigh out deionized water, hydroxyethyl cellulose, dispersant, wetting agent, alkaline pH adjuster, mildew inhibitor, defoamer, film-forming aid, titanium dioxide and calcined kaolin according to the formula, add them to the dispersion tank, disperse at high speed of 1200 r / min for 30 min until the fineness of the material is <50 μm, then add the aqueous emulsion and the protective colloid solution prepared in step (1), stir at 400 r / min for 10 min to obtain white base paint;

[0104] (3) Preparation of colored paint: According to the required color, the white base paint obtained in step (2) is mixed with red, black and yellow water-based color pastes to make colored paints of various colors.

[0105] (4) Preparation of colored particles: According to the mixing weight ratio of colored paint and protective adhesive solution of 2:1, the colored paint obtained in step (3) and the protective adhesive solution obtained in step (1) are mixed and granulated at a speed of 300r / min. After granulation for 8min, colored particles with a particle size of 1-5mm are obtained.

[0106] (5) Preparation of water-based multicolor paints suitable for graffiti:

[0107] Weigh out the deionized water, water-based emulsion, dispersant, wetting agent, defoamer, film-forming aid, mildew inhibitor, nano silica aerogel and alkaline pH adjuster according to the formula, place them in a disperser, and stir at a low speed of 500 r / min for 15 min until all components are mixed evenly. Then add the thickener and continue stirring for 8 min. Then add the colored particles and graffiti modifier obtained in step (4), and stir at a speed of 200 r / min for 12 min to ensure that the colored particles are evenly dispersed and do not agglomerate. After stirring evenly, the graffiti-friendly water-based multicolor paint is obtained.

[0108] Performance testing: The VOC content of this coating is ≤12g / L, which meets the requirements of the national standard (GB 30981.1-2025 Limits of Hazardous Substances in Coatings Part 1: Architectural Coatings); graffiti can be completely removed by wiping with water for 30 seconds without leaving any residue or damage to the coating; the colored particles are evenly dispersed, and the finished product does not separate, bleed, or agglomerate after 12 months of storage at room temperature; the coating adhesion is Grade 1 (GB / T 9286 Cross-cut test for paint and varnish film); it withstands water immersion for 9 weeks without blistering, whitening, peeling, or loss of gloss; the 150μm thick coating can withstand acid and alkali for up to 500 hours; the mildew resistance is Grade 0; the waterproof rating is IP65; and the paint film shows no signs of blooming, substrate exposure, or colored particle peeling after more than 11,000 scrub tests.

[0109] Example 3

[0110] A water-based multicolor paint suitable for graffiti is mainly prepared from the following components in the following weight ratios: 40 parts water-based emulsion, 18.8 parts deionized water, 32 parts colored particles, 4 parts graffiti modifier, 0.3 parts dispersant, 0.3 parts wetting agent, 0.2 parts defoamer, 0.6 parts thickener, 1.8 parts film-forming aid, 0.2 parts mildew inhibitor, 1.2 parts nano-silica aerogel, and 0.2 parts alkaline pH adjuster;

[0111] The colored particles are granulated from colored paint and protective adhesive solution at a weight ratio of 2.5:1;

[0112] The protective adhesive solution is mainly prepared from the following components in the following weight ratio: 94.35 parts deionized water, 0.15 parts slip agent, and 5.5 parts lithium magnesium silicate;

[0113] The colored paint is made by mixing white base paint with water-based color paste;

[0114] The white base paint is mainly composed of the following components in the following weight ratios: 47.7 parts deionized water, 1 part hydroxyethyl cellulose, 0.2 parts dispersant, 0.2 parts wetting agent, 0.2 parts alkaline pH adjuster, 0.2 parts mildew inhibitor, 0.3 parts defoamer, 1.4 parts film-forming aid, 1.7 parts titanium dioxide, 4 parts calcined kaolin, 35 parts water-based emulsion, and 8 parts protective colloid solution;

[0115] In this embodiment, the aqueous emulsion is composed of silicone-acrylic emulsion and elastic emulsion in a mass ratio of 4:1. The paintable modifier is polyether-modified polysiloxane; the dispersant is an ammonium salt dispersant; the wetting agent is a nonionic wetting agent; the defoamer is an organosilicon defoamer; the thickener is a polyurethane thickener; the film-forming aid is dodecyl alcohol ester; the mildew inhibitor is an isothiazolinone mildew inhibitor; the alkaline pH adjuster is ammonia water; the slip agent is organosilicon-modified polyethylene wax micro powder; and the titanium dioxide is rutile titanium dioxide.

[0116] The preparation method of this water-based multicolor paint that can be used for graffiti is as follows:

[0117] (1) Preparation of protective adhesive solution: Weigh deionized water, slip agent and lithium magnesium silicate according to the formula, place them in a disperser, and disperse them at a high speed of 900 r / min for 25 min until all components are completely dissolved to obtain the protective adhesive solution.

[0118] (2) Preparation of white base paint: Weigh out deionized water, hydroxyethyl cellulose, dispersant, wetting agent, alkaline pH adjuster, mildew inhibitor, defoamer, film-forming aid, titanium dioxide and calcined kaolin according to the formula, add them to the dispersion tank, disperse at a high speed of 1000 r / min for 25 min until the fineness of the material is <50 μm, then add the aqueous emulsion and the protective colloid solution prepared in step (1), stir at a speed of 300 r / min for 8 min to obtain white base paint;

[0119] (3) Preparation of colored paint: According to the required color, the white base paint obtained in step (2) is mixed with red, black and yellow water-based color pastes to make colored paints of various colors.

[0120] (4) Preparation of colored particles: According to the mixing weight ratio of colored paint to protective adhesive solution of 2.5:1, the colored paint obtained in step (3) and the protective adhesive solution obtained in step (1) are mixed and granulated at a speed of 250 r / min. After granulation for 7 min, colored particles with a particle size of 1-5 mm are obtained.

[0121] (5) Preparation of water-based multicolor paints suitable for graffiti:

[0122] Weigh out the deionized water, water-based emulsion, dispersant, wetting agent, defoamer, film-forming aid, mildew inhibitor, nano silica aerogel and alkaline pH adjuster according to the formula, place them in a disperser, and stir at a low speed of 400 r / min for 12 min until all components are mixed evenly. Then add the thickener and continue stirring for 6 min. Then add the colored particles and graffiti modifier obtained in step (4), and stir at a speed of 150 r / min for 10 min to ensure that the colored particles are evenly dispersed and do not agglomerate. After stirring evenly, the graffiti-friendly water-based multicolor paint is obtained.

[0123] Performance testing: The VOC content of this coating is ≤15g / L, which meets the requirements of the national standard (GB 30981.1-2025 Limits of Hazardous Substances in Coatings Part 1: Architectural Coatings); graffiti can be completely removed by wiping with water for 20 seconds without leaving any residue or damage to the coating; the colored particles are evenly dispersed, and the finished product does not delaminate, bleed, or agglomerate after being stored at room temperature for ≥14 months; the coating adhesion is grade 0 (GB / T 9286 Cross-cut test for paint and varnish film); it withstands water immersion for 14 weeks without blistering, whitening, peeling, or loss of gloss; the 150μm thick coating can withstand acid and alkali for up to 550 hours; the mildew resistance is grade 0; the waterproof rating is IP65; and the paint film shows no signs of blooming, substrate exposure, or colored particle peeling after more than 12,000 scrub tests.

[0124] Products bearing patents CN112961561A and CN101845260B were selected as comparative examples and tested simultaneously with Example 3 of this invention, under the same test conditions: the coating consumption of the test samples was uniformly 0.45 kg / m². 2 After curing in a constant temperature and humidity chamber for 14 days, the results were tested and are shown in Table 1 below.

[0125] Table 1

[0126]

[0127] The test results show that neither of the two coatings disclosed in CN112961561A and CN101845260B can simultaneously achieve multi-colored stable granulation and traceless graffiti writing, and their protective, environmental protection and storage performance are significantly weaker than that of the present invention. The present invention achieves excellent comprehensive technical effects.

[0128] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water-based multicolor paint suitable for graffiti, characterized in that, It is mainly prepared from the following components in the following weight ratios: 35-45 parts of aqueous emulsion, 7.6–30 parts deionized water 30-35 parts of colored particles, Apply 2-6 parts of paintable modifier. Dispersant 0.2-0.4 parts, Wetting agent 0.1-0.5 parts, Defoamer 0.1-0.4 parts, Thickener 0.3–1.0 parts, Film-forming aid 1.5–2.0 parts, 0.1–0.3 parts of antifungal agent, 0.6–1.5 parts of nano-silica aerogel 0.1–0.3 parts of alkaline pH adjuster; The aqueous emulsion is composed of silicone-acrylic emulsion and elastic emulsion in a mass ratio of 3-5:1; The colored particles are granulated from colored paint and protective adhesive solution at a weight ratio of 1.5-2.5:1; The protective adhesive solution is mainly prepared from the following components in the following weight ratio: 93.8-94.9 parts deionized water, 0.1-0.2 parts slip agent, and 5-6 parts lithium magnesium silicate.

2. The water-based multicolor paint that can be used for graffiti according to claim 1, characterized in that: The silicone-acrylic emulsion has a room temperature Brinell viscosity of 100–1500 cps at 25°C, rotor No. 3, and 60 r / min, and a minimum film-forming temperature of 40 ± 2°C; the elastic emulsion has a room temperature Brinell viscosity of 400–3600 cps at 25°C, rotor No. 3, and 30 r / min, and a minimum film-forming temperature of <0°C.

3. The water-based multicolor paint that can be used for graffiti according to claim 1, characterized in that: The colored paint is made by mixing white base paint with water-based color paste; The white base paint is mainly composed of the following components in the following weight ratios: 38.5-56.9 parts deionized water, 0.8-1.2 parts hydroxyethyl cellulose, 0.1-0.3 parts dispersant, 0.1-0.3 parts wetting agent, 0.1-0.3 parts alkaline pH adjuster, 0.1-0.3 parts mildew inhibitor, 0.2-0.5 parts defoamer, 1.2-1.6 parts film-forming aid, 1.5-2 parts titanium dioxide, 2-5 parts calcined kaolin, 30-40 parts of the aqueous emulsion, and 7-10 parts of the protective colloid solution.

4. The water-based multicolor paint that can be used for graffiti according to claim 3, characterized in that: The preparation method of the white base paint includes the following steps: weigh deionized water, hydroxyethyl cellulose, dispersant, wetting agent, alkaline pH adjuster, antifungal agent, defoamer, film-forming aid, titanium dioxide and calcined kaolin according to the formula, add them to the dispersion tank, control the rotation speed at 800-1200 r / min, disperse at high speed for 20-30 min until the material fineness is <50 μm, then add the aqueous emulsion and the protective colloid solution, control the rotation speed at 200-400 r / min, stir for 5-10 min to obtain the white base paint.

5. The water-based multicolor paint that can be used for graffiti according to claim 1, characterized in that: The preparation method of the protective adhesive solution includes the following steps: weigh deionized water, slip agent and lithium magnesium silicate according to the formula, place them in a disperser, and disperse them at high speed for 20-30 minutes at a speed of 800-1200 r / min until all components are completely dissolved to obtain the protective adhesive solution.

6. The water-based multicolor paint that can be used for graffiti according to claim 1, characterized in that: The graffiti-friendly modifier is a polyether-modified polysiloxane.

7. The water-based multicolor paint that can be used for graffiti according to claim 3, characterized in that: The dispersant is an ammonium salt dispersant; The wetting agent is a nonionic wetting agent; The defoamer is an organosilicon defoamer; The thickener is a polyurethane thickener; The film-forming aid is dodecyl alcohol ester; The antifungal agent is an isothiazolinone-type antifungal agent; The alkaline pH adjuster is ammonia water; The titanium dioxide is rutile titanium dioxide.

8. The water-based multicolor paint that can be used for graffiti according to claim 1, characterized in that: The slip agent is silicone-modified polyethylene wax micro powder.

9. The method for preparing the water-based multicolor paint that can be used for graffiti according to any one of claims 1-8, characterized in that: Includes the following steps: (1) Preparation of colored paint: According to the required color, the white base paint is mixed with the corresponding water-based color paste to obtain the colored paint of various colors; (2) Preparation of colored particles: According to the mixing weight ratio of colored paint to protective adhesive solution of 1.5-2.5:1, the colored paint prepared in step (1) is mixed with the protective adhesive solution, and the rotation speed is controlled at 200-300r / min for granulation. After granulation for 5-8 minutes, the desired colored particles are obtained. (3) Preparation of water-based multicolor paint for graffiti: Weigh out deionized water, water-based emulsion, dispersant, wetting agent, defoamer, film-forming aid, mildew inhibitor, nano silica aerogel and alkaline pH adjuster according to the formula, place them in a disperser, stir for 10-15 minutes at a speed of 300-500 r / min until they are evenly mixed, add thickener, continue stirring for 5-8 minutes, add colored particles and graffiti modifier, control the speed at 100-200 r / min, stir for 8-12 minutes to ensure that the colored particles are evenly dispersed and do not agglomerate, and after stirring evenly, the water-based multicolor paint for graffiti is obtained.

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