Color-blocking pigment compositions, their preparation methods and applications

Abstract

This invention discloses a color-blocking pigment composition, its preparation method, and an acrylic pigment containing the color-blocking pigment composition. The color-blocking pigment composition comprises pigment particles and a resin coating the pigment particles. Because the pigment particles of this invention are coated with resin, when applied to different pigment, coating, ink, or paint systems, different colors exhibit clear boundaries and do not mix, greatly enriching the color gradation of the product. Simultaneously, the resin coating treatment significantly improves the product's lightfastness.

Description

Technical Field

[0001] This invention belongs to the field of pigments, specifically relating to color-blocking pigment compositions, their preparation methods, and applications. Background Technology

[0002] Acrylic paint is a type of painting pigment that has advantages such as color that does not easily turn gray, bright colors, quick drying, resistance to peeling, water resistance, and strong covering power, and is widely used both domestically and internationally.

[0003] Among acrylic paint products, fluid acrylic paint has become a relatively new and popular choice due to its unique advantages. Fluid acrylic painting offers the following benefits: the paint exhibits excellent fluidity, allowing multiple colors to collide and permeate each other as they flow, spreading outwards like water to create a variety of striking and intriguing patterns. This fluidity allows the paint to move freely, bringing dynamism and rhythmic variation to the painting.

[0004] Currently, fluid pigments mainly involve diluting ordinary acrylic pigments with thinners to enhance their flowability. However, this approach introduces several problems. Thinners, typically composed of organic solvents and a small amount of water, are used to reduce pigment concentration, making the pigment thinner and easier to apply. However, thinners contain toxic components, such as organic solvents, which can harm the human body. Furthermore, they still suffer from low fluidity, leading to color mixing in splash painting and unclear boundaries between mixed colors. CN109054552A discloses a method for preparing an auxiliary medium for splash painting acrylic pigments. This involves preparing an acrylic emulsion with a predetermined mass fraction, wherein the acrylic acid mass fraction is greater than or equal to 88% and less than or equal to 95%. An antifoaming agent, wetting agent, thickener, and film-forming aid are sequentially added to the acrylic emulsion to obtain a mixture that helps improve the fluidity of the acrylic pigment, resulting in clearer, non-mixing splashes, improved penetration between different color layers, and preservation of the three-dimensional shape after drying. However, this patent still does not solve the problems of color mixing and unclear boundaries. Summary of the Invention

[0005] To address the aforementioned problems, the present invention provides a color-blocking pigment composition, a method for preparing the same, an acrylic pigment comprising the color-blocking pigment composition, and applications of the color-blocking pigment composition.

[0006] One aspect of the present invention provides a color-blocking pigment composition comprising pigment particles and a resin coating the pigment particles.

[0007] According to one embodiment of the present invention, the resin is one or more of phenolic resin, aldehyde-ketone resin, polyvinyl butyral, chlorinated polypropylene resin, polyimide, and styrene-maleic anhydride copolymer; and / or the pigment particles are one or more of inorganic pigment particles and organic pigment particles; for example, the inorganic pigments and organic pigments are selected from one or more of titanium dioxide, zinc oxide, lithopone, lead chromium yellow, iron yellow, lead chromate silicate, strontium calcium yellow, transparent yellow, benzidine yellow, Hansa yellow, lemon yellow, iron oxide red, scarlet, chrome red, transparent red, phthalocyanine blue, ultramarine, carbon black, iron black, and aniline black.

[0008] According to another embodiment of the present invention, the color-blocking pigment composition further includes an emulsifier and / or a thickener.

[0009] According to another embodiment of the present invention, the emulsifier has a hydrophilic-hydrophobic molecular chain; preferably, the emulsifier is selected from one or more of fatty alcohol polyoxyethylene ether, fatty acid glyceride polyoxyethylene ether, polyethylene glycol polyether, polyoxyethylene alkylphenol ether, and polyoxyethylene polyoxypropylene block copolymer.

[0010] Another aspect of the present invention provides a method for preparing a color-blocking pigment composition, comprising: coating pigment particles with resin.

[0011] According to one embodiment of the present invention, the resin coating of the pigment particles comprises: dissolving an emulsifier in deionized water to form a mixture a; dispersing the pigment particles in the mixture a to obtain a semi-solid mixture b; adding the resin to a solvent to form a mixture d; adding the mixture d to the semi-solid mixture b and dispersing to form an emulsion e; and removing the solvent from the emulsion e to obtain the color-blocking pigment composition.

[0012] According to another embodiment of the present invention, the emulsifier has a hydrophilic-hydrophobic molecular chain. The emulsifier is selected from one or more of fatty alcohol polyoxyethylene ethers, fatty acid glyceride polyoxyethylene ethers, polyethylene glycol polyethers, polyoxyethylene alkylphenol ethers, and polyoxyethylene-polyoxypropylene block copolymers.

[0013] According to another embodiment of the present invention, the mixture a further includes a thickener.

[0014] According to another embodiment of the present invention, before adding the mixture d to the semi-solid mixture b, the semi-solid mixture b is processed into an intermediate product c with a predetermined particle size, and then the mixture d is added to the intermediate product c and dispersed to obtain an emulsion e′. Finally, the solvent in the emulsion e′ is removed to obtain the color-blocking pigment composition.

[0015] According to another embodiment of the present invention, the total weight of all components of the color-blocking pigment composition is 100 parts, wherein the pigment particles are 20-50 parts by weight, the resin is 5-20 parts by weight, the emulsifier is 5-20 parts by weight, the thickener is 1-5 parts by weight, the solvent is 10-20 parts by weight, and the deionized water is 20-40 parts by weight.

[0016] Different color pastes can be obtained by adjusting different pigment ratios. Through the above preparation method, resin-coated pigment pastes can be obtained. The pigment particles are first pre-emulsified to ensure overall dispersibility. At the same time, during the organic solvent removal process, due to the gas exchange operation of the system, the organic solvent can be discharged from the entire slurry system more quickly and timely. Compared with the direct heating and drying operation, the evaporation rate is more linear, so a more uniform microcapsule system can be obtained. At the same time, the microcapsule system can enhance the dispersibility of pigment particles, resulting in a more dispersed pigment system and improving the overall color development of the paste.

[0017] A third aspect of the present invention provides an acrylic pigment comprising the above-described color-blocking pigment composition.

[0018] According to one embodiment of the present invention, the acrylic pigment comprises: 10-30 parts by weight of acrylic emulsion, 5-15 parts by weight of film-forming agent, 5-15 parts by weight of diluent, 1-8 parts by weight of dispersant, 0.1-3 parts by weight of antifungal and bactericidal agent, 20-40 parts by weight of deionized water, and 10-40 parts by weight of the color-blocking pigment composition, wherein the total weight of all components in the acrylic pigment is 100 parts by weight.

[0019] The fourth aspect of the present invention provides the application of the above-described color-blocking pigment composition or the color-blocking pigment composition prepared by the above-described preparation method in pigments, coatings, inks, and paints.

[0020] The color-blocking pigment composition of the present invention, because the pigment particles are coated with resin, exhibits a clear distinction between different colors when applied to various pigment, coating, ink, and paint systems, preventing color mixing and greatly enriching the color gradation of the product. Furthermore, the resin coating treatment significantly improves the pigment particles' resistance to sunlight.

[0021] The acrylic pigment of this invention employs a resin-coated pigment particle composition, which increases the dispersion of the pigment in the system, resulting in a finer texture and more vibrant colors. Simultaneously, the resin coating treatment of the pigment particles significantly enhances lightfastness, resulting in a significantly higher lightfastness rating for the resulting fluid acrylic pigment compared to ordinary acrylic pigments. Furthermore, the raw materials used in the acrylic pigment of this invention are all non-toxic, the production process is green and safe, and the resulting pigment is non-toxic and harmless, ensuring safe and reliable use. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to specific embodiments. The scope of protection of the present invention is not limited to the following embodiments; these examples are provided for illustrative purposes only and do not limit the present invention in any way.

[0023] The color-blocking pigment composition of the present invention includes pigment particles and a resin coating the pigment particles. The resin-coated pigment particles in the color-blocking pigment composition of the present invention effectively prevent color mixing when different colors are mixed in a system containing the pigment. Simultaneously, because the pigment particles are coated with resin, lightfastness is significantly improved.

[0024] In optional embodiments, the resin used may be one or more of phenolic resin, aldehyde-ketone resin, polyvinyl butyral, chlorinated polypropylene resin, polyimide, and styrene-maleic anhydride copolymer. The pigment particles may be one or more of inorganic and organic pigment particles. For example, the inorganic and organic pigments are selected from one or more of titanium dioxide, zinc oxide, lithopone, lead chrome yellow, iron yellow, lead chromate silicate, calcium strontium yellow, transparent yellow, benzidine yellow, Hansa yellow, lemon yellow, iron oxide red, scarlet, chrome red, transparent red, phthalocyanine blue, ultramarine, carbon black, iron black, and aniline black.

[0025] In optional embodiments, the color-blocking pigment composition further includes an emulsifier and / or a thickener. The emulsifier can modify the surface of the pigment particles, promoting resin encapsulation of the pigment particles and facilitating the formation of microcapsule structures. Preferably, the emulsifier has a hydrophilic-hydrophobic molecular chain, such as one or more selected from fatty alcohol polyoxyethylene ethers, fatty acid glyceride polyoxyethylene ethers, polyethylene glycol polyethers, polyoxyethylene alkylphenol ethers, and polyoxyethylene-polyoxypropylene block copolymers. The thickener can increase the viscosity of the composition system, reduce the sedimentation of pigment particles in the system, and maintain the stability of the composition system. The thickener can be, but is not limited to, carboxymethyl cellulose series, xanthan gum, polyvinylpyrrolidone, cellulose ethers, etc.

[0026] The method for preparing the color-blocking pigment composition of the present invention includes: coating pigment particles with resin. The pigment particles can be coated with resin in any suitable manner to form a microcapsule structure.

[0027] In an optional embodiment, the method of coating pigment particles with resin may include: adding an emulsifier to deionized water and completely dissolving it to form a mixture a; adding pigment particles to mixture a and dispersing them to obtain a semi-solid mixture b; adding resin to a solvent to form a mixture d; adding mixture d to the semi-solid mixture b and dispersing it to form an emulsion e; and removing the solvent from the emulsion e to obtain a color-blocking pigment composition.

[0028] In this embodiment, the process of dispersing pigment particles in mixture a involves surface modification of the pigment particles using an emulsifier. By modifying the surface of the pigment particles with an emulsifier, a more uniform microcapsule system can be obtained. Simultaneously, the microcapsule system enhances the dispersibility of the pigment particles, resulting in a more dispersed pigment system and improving the overall color rendering of the pigment composition. Preferably, the emulsifier has hydrophilic-hydrophobic molecular chains. The emulsifier is selected from one or more of fatty alcohol polyoxyethylene ethers, fatty acid glyceride polyoxyethylene ethers, polyethylene glycol polyethers, polyoxyethylene alkylphenol ethers, and polyoxyethylene-polyoxypropylene block copolymers.

[0029] Mixture a may also include a thickener. When a thickener is included, the process of forming mixture a can be achieved by dissolving the emulsifier and thickener in deionized water. The process of forming mixture a can be carried out under stirring. The stirring speed can be 200-800 rpm, and the stirring time can be 50-120 min. Preferably, the stirring speed is 80-100 min, and the stirring time is 400-600 rpm. Adding a thickener can increase the viscosity of the system, thereby reducing the sedimentation of pigment particles in the system and maintaining the stability of the system. Suitable thickeners can be, but are not limited to, carboxymethyl cellulose series, xanthan gum, polyvinylpyrrolidone, cellulose ethers, etc.

[0030] Pigment particles can be added to mixture a under stirring and dispersed evenly to obtain a semi-solid mixture b. The stirring speed can be 200-800 rpm, and the stirring time can be 50-120 min. Preferably, the stirring speed is 80-100 min, and the stirring time is 400-600 rpm.

[0031] Subsequently, the resin-containing mixture d can be directly added to the semi-solid mixture b to disperse and form emulsion e. Alternatively, the semi-solid mixture b can be processed, for example, by grinding, to obtain an intermediate product c with a predetermined particle size, and then the mixture d can be added to the intermediate product c to disperse evenly and form emulsion e′. Finally, the solvent in emulsion e or emulsion e′ is removed to obtain a color-blocking pigment composition. Both of the above methods can yield a color-blocking pigment composition including resin-coated pigment particles. However, including the step of processing the semi-solid mixture b to obtain the intermediate product c with a predetermined particle size can reduce the particle size of the pigment particles, prevent pigment particle agglomeration, and improve the dispersibility of the pigment particles. Thus, a color-blocking pigment composition with finer particles and a more stable structure is obtained. The grinding process of the semi-solid mixture b can be performed by multiple grindings, for example, 3-10 times, preferably 5-8 times. The particle size of the processed intermediate product c is 3-50 μm, preferably 10-40 μm. The process of adding the mixture d to the semi-solid mixture b or the intermediate product c to form emulsion e or e′ can be carried out under stirring. For example, the stirring speed can be 800-3000 rpm, and the stirring time can be 50-120 min. Preferably, the stirring speed is 1000-2000 rpm, and the stirring time is 80-100 min.

[0032] The resin in mixture d encapsulates the pigment particles in the system, forming a microcapsule structure. The resin can be, for example, but not limited to, phenolic resin, aldehyde-ketone resin, polyvinyl butyral, chlorinated polypropylene resin, polyimide, styrene-maleic anhydride copolymer, etc. The solvent dissolves and disperses the resin in the system, ensuring complete dispersion of the resin molecules to form the mixture. This results in the formation of an encapsulation structure in the color-blocking pigment composition system. Suitable solvents can be, for example, but not limited to, toluene, xylene, dichlorotoluene, chloroform, ethyl acetate, tetrahydrofuran, acetone, diethyl ether, dimethyl ether, etc. The process of forming mixture d can be carried out under stirring. The stirring speed can be 200-800 rpm, and the stirring time can be 50-120 min. Preferably, the stirring speed is 80-100 min, and the stirring time is 400-600 rpm.

[0033] The method for removing solvent from emulsion e or e′ can be any suitable manner. For example, but not limited to, removing solvent by heating. The heating temperature can be 30-60°C, and the time can be 24-48 hours. Preferably, the heating temperature is 45-50°C, and the heating time is 35-40 hours. During solvent removal, the system can be ventilated to allow the solvent to be discharged more rapidly and promptly from the entire slurry system. Compared to direct heating and drying, the evaporation rate is more linear, thus resulting in a more uniform microcapsule system. Simultaneously, the microcapsule system enhances the dispersibility of pigment particles, resulting in a more dispersed pigment system and improving the overall color development of the pigment paste.

[0034] The proportions of all components in the preparation of the color-blocking pigment composition can be selected appropriately according to actual needs. For example, with a total weight of 100 parts, the composition may include 20-50 parts by weight of pigment particles, 5-20 parts by weight of resin, 5-20 parts by weight of emulsifier, 1-5 parts by weight of thickener, 10-20 parts by weight of solvent, and 20-40 parts by weight of deionized water. Preferably, the proportions are 30-40 parts by weight of pigment particles, 8-15 parts by weight of resin, 7-15 parts by weight of emulsifier, 2-4 parts by weight of thickener, 8-12 parts by weight of solvent, and 25-35 parts by weight of deionized water.

[0035] The method of the present invention can obtain pigment compositions of different colors by adjusting the proportions of different color pigments.

[0036] This invention also provides an acrylic paint comprising the above-described color-blocking pigment composition. When the acrylic paint containing the above-described color-blocking pigment composition is mixed with acrylic paints in different color systems for painting, there is a clear sense of boundary between different colors, and color mixing does not occur, greatly enriching the sense of layering in the painting. At the same time, due to the special treatment of the pigment molecules, the lightfastness is greatly improved, and the resulting fluid acrylic paint has a significantly higher lightfastness rating than ordinary acrylic paints.

[0037] In an optional embodiment, the acrylic pigment comprises: 10-30 parts by weight of acrylic emulsion, 5-15 parts by weight of film-forming agent, 5-15 parts by weight of diluent, 1-8 parts by weight of dispersant, 0.1-3 parts by weight of antifungal and bactericidal agent, 20-40 parts by weight of deionized water, and 10-40 parts by weight of color-blocking pigment composition, wherein the total weight of all components in the acrylic pigment is 100 parts by weight. The raw materials used in the fluid acrylic pigment of the present invention are all non-toxic, the production process is green and safe, and the resulting pigment is non-toxic and harmless, making it safe and reliable to use.

[0038] In acrylic pigments, acrylic emulsions act as a binder in the system, enhancing pigment adhesion and ensuring uniform coloring. Suitable acrylic emulsions include, but are not limited to, one or more of the following: styrene-acrylate copolymer emulsions, acrylate-ethylene tert-carbonate copolymer emulsions, silicone-acrylate copolymer emulsions, and all-acrylate copolymer emulsions.

[0039] Film-forming agents in the system promote film formation of acrylic paints during application, ensuring the formation of a film-like structure, promoting the plastic flow and elastic deformation of polymer compounds, and improving coalescence properties. Suitable film-forming aids include, but are not limited to, one or more of the following: ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol n-butyl ether, and propylene glycol phenyl ether.

[0040] The diluent in the system alters the viscosity and flowability of the pigment without affecting its color and gloss, thus allowing for better creation. There are no particular limitations on the diluent, as long as it does not adversely affect the purpose of this invention. Suitable diluents include, but are not limited to, one or more of ethylene glycol, diethylene glycol, propylene glycol, glycerol, isopropanol, and n-butanol.

[0041] The dispersant plays a wetting and dispersing role in the system, ensuring that the pigment particles maintain a certain degree of dispersion in the mixture. Wetting the system also makes it easier for the fluid acrylic paint to adhere to the medium during painting. There are no particular limitations on the dispersant, as long as it does not adversely affect the purpose of this invention. Suitable dispersants include, but are not limited to, one or more of the following: acrylic block copolymers, polyoxyethylene-styrene polymers, high molecular weight block copolymers containing pigment-affinity groups, and polyphosphate solutions.

[0042] Antifungal and bactericidal agents play a role in preventing and sterilizing the finished acrylic paint in the system, ensuring the long-term shelf life of the product. Suitable antifungal and bactericidal agents include, but are not limited to, one or more of benzoic acid, p-hydroxybenzoic acid, sorbic acid, propionic acid, dehydroacetic acid and their salts.

[0043] The color-blocking pigment paste plays a coloring role in the system, and the unique formulation system enables the composition system to prevent the mixing of different colors.

[0044] Preferably, the acrylic pigment comprises: 15-25 parts by weight of acrylic emulsion, 8-12 parts by weight of film-forming agent, 8-10 parts by weight of diluent, 3-5 parts by weight of dispersant, 0.5-1 parts by weight of antifungal and bactericidal agent, 25-35 parts by weight of deionized water, and 20-30 parts by weight of color-blocking pigment composition.

[0045] The method for preparing acrylic pigment of the present invention can be used to moderate the above components by any suitable method to obtain acrylic pigment.

[0046] In an optional embodiment, the preparation method of acrylic pigment may include: adding acrylic emulsion to deionized water, stirring evenly, adding a dispersant, and continuing to stir until no obvious bubbles are present to obtain a homogeneous mixture 1; stirring and mixing a film-forming agent, a diluent, and a mildew inhibitor evenly to obtain a homogeneous mixture 2; stirring and mixing mixture 1 and mixture 2 evenly to obtain mixture 3; adding the color-blocking pigment composition to mixture 3 under slow stirring, and stirring evenly until no obvious particles are present to obtain an acrylic pigment.

[0047] The processes for obtaining mixtures 1, 2, and 3 can all be carried out under stirring, with a stirring speed of 800-3000 rpm and a stirring time of 50-120 min. Preferably, the stirring speed is 1000-2000 rpm and the stirring time is 80-100 min.

[0048] The process of adding the color-blocking pigment composition to mixture 3 and dispersing it evenly can also be carried out under stirring. The stirring speed can be 200-800 rpm, and the stirring time can be 80-200 min. Preferably, the stirring speed is 400-600 rpm, and the stirring time is 100-150 min.

[0049] This invention reshapes the acrylic paint formulation system, developing a novel fluid acrylic paint system with color-blocking properties. Compared to existing acrylic paints, the fluid acrylic paints of different color systems obtained by this invention do not exhibit color mixing when mixed, and also possess clear and distinct boundaries in ink splash painting, greatly enhancing the sense of depth in the painting. Furthermore, by modifying the pigment particles with an emulsifier, the dispersion of pigment particles in the system is increased, thereby further enhancing the vibrancy of the painting and significantly improving its painting performance.

[0050] The present invention is further described below through specific examples. However, these examples are merely exemplary and do not constitute any limitation on the scope of protection of the present invention. Unless otherwise specified, the reagents, materials, and instruments used in the following embodiments and comparative examples are commercially available.

[0051] In the following examples and comparative examples, the parts refer to parts by weight.

[0052] Example 1

[0053] Ten parts of octadecyl alcohol polyoxyethylene ether (Taizhou Jiayin Chemical Co., Ltd.) and four parts of sodium carboxymethyl cellulose (Shaanxi Rankang Biotechnology Co., Ltd.) were added to 35 parts of deionized water and stirred slowly at 400 rpm until completely dissolved to form a uniform mixture. Then, 33 parts of pigment red powder (Anhui Jingzhicai New Material Co., Ltd.) were added to the mixture while stirring slowly and stirred for 80 minutes to disperse evenly into a semi-solid mixture. The semi-solid mixture was then ground five times by a three-roll mill to obtain fine granular semi-solid material, thus obtaining the grinding intermediate.

[0054] Ten parts of phenolic resin (Jinan Nuochuang Chemical Co., Ltd.) were added to eight parts of toluene solvent (Hubei Xingyan New Material Technology Co., Ltd.). The mixture was slowly stirred at 400 rpm until completely dissolved and homogeneous. The mixture was then added to the grinding intermediate under continuous rapid stirring at 1000 rpm to form a homogeneous emulsion. The homogeneous emulsion was placed in a sealed container, stirred slowly at 500 rpm, and dried at 45°C. During the drying process, the sealed container was ventilated, and nitrogen gas was introduced to remove the organic solvent that had evaporated due to heat. The drying was continued for 35 hours until the organic solvent had completely evaporated, resulting in a microcapsule-structured color-blocking pigment paste (color-blocking pigment composition).

[0055] Add 20 parts of styrene-acrylate copolymer emulsion (Langfang Bingxian New Building Materials Co., Ltd.) to 25 parts of deionized water, stir at 1000 rpm until uniformly mixed, then add 3 parts of acrylic block copolymer (Efka PX4701 Shanghai Jingyan Chemical Co., Ltd.), and continue stirring for 80 minutes until no obvious bubbles are present, to obtain a uniform mixture 1.

[0056] 12 parts of ethylene glycol butyl ether (Jinan Qizhi Chemical Technology Co., Ltd.), 9.5 parts of ethylene glycol (Wuxi Yuanzhiquan Chemical Products Co., Ltd.), and 0.5 parts of sodium benzoate (Langfang Qianyao Technology Co., Ltd.) were stirred at 1000 rpm until homogeneous to obtain a homogeneous mixture 2. Mixture 1 and mixture 2 were stirred at 1000 rpm for 100 min until homogeneous to obtain mixture 3. 30 parts of color-blocking pigment paste were added to mixture 3 while stirring slowly at 500 rpm. The mixture was stirred for 120 min until homogeneous and free of obvious particles, thus obtaining a red fluid acrylic pigment.

[0057] Example 2

[0058] 10 parts of polyethylene glycol glycerol ether (Nantong Xitai Chemical Co., Ltd.) and 2 parts of xanthan gum (Henan Xinzhiyuan Chemical Products Co., Ltd.) were added to 33 parts of deionized water and stirred slowly at 400 rpm until completely dissolved to form a uniform mixture. Then, 30 parts of tartrazine pigment (Linyi Xinlei Pigment Co., Ltd.) and 5 parts of transparent yellow pigment (Xinxiang Deke Effect Pigment Co., Ltd.) were added to the mixture while stirring slowly. The mixture was stirred for 80 minutes to disperse evenly and form a semi-solid mixture. The semi-solid mixture was then ground 5 times by a three-roll mill to obtain a fine granular semi-solid material, which is the grinding intermediate.

[0059] Ten parts of polyvinyl butyral resin (Jiangsu Kafer New Material Technology Co., Ltd.) were added to ten parts of xylene solvent (Jiangyin Ouchen Chemical Co., Ltd.). The mixture was slowly stirred at 400 rpm until completely dissolved and homogeneous. The mixture was then added to the grinding intermediate under continuous rapid stirring at 1000 rpm to form a homogeneous emulsion. The homogeneous emulsion was placed in a sealed container, and the mixture was slowly stirred at 500 rpm and heated to 45°C for drying. During the drying process, the sealed container was ventilated, and nitrogen gas was introduced to remove the organic solvent that had evaporated due to the heat. The drying was continued for 35 hours until the organic solvent had completely evaporated, resulting in a microcapsule structure colorant pigment paste.

[0060] Add 15 parts of acrylate-ethylene tert-carbonate copolymer emulsion (Shandong Li'ang New Material Technology Co., Ltd.) to 29 parts of deionized water, stir at 1000 rpm until homogeneous, then add 5 parts of polyoxyethylene-styrene polymer (HH2003F Guangzhou Houhuan Chemical Additives Co., Ltd.), and continue stirring for 80 minutes until no obvious bubbles are present, to obtain a homogeneous mixture 1.

[0061] 12 parts of propylene glycol methyl ether (Jiangyin Ouchen Chemical Co., Ltd.), 8 parts of propylene glycol (Jinan Zesheng Chemical Co., Ltd.), and 1 part of p-hydroxybenzoic acid (Jiangsu Jiujia Biotechnology Co., Ltd.) were stirred at 1000 rpm until homogeneous to obtain a homogeneous mixture 2. Mixture 1 and mixture 2 were stirred at 1000 rpm for 100 min until homogeneous to obtain mixture 3. 30 parts of color-blocking pigment paste were added to mixture 3 while stirring slowly at 500 rpm. The mixture was stirred for 120 min until homogeneous and free of obvious particles, thus obtaining a yellow fluid acrylic pigment.

[0062] Example 3

[0063] 15 parts of polyethylene glycol monolaurate ether (Wuhan Huaxiang Kejie Biotechnology Co., Ltd.), 3 parts of polyvinylpyrrolidone (Jinan Mingxin Chemical Co., Ltd.), and 25 parts of deionized water were added and stirred slowly at 400 rpm until completely dissolved to form a uniform mixture. Then, 20 parts of phthalocyanine blue pigment (Suzhou Jiajisen New Material Technology Co., Ltd.) and 10 parts of ultramarine pigment (Henan Tianchou Chemical Products Co., Ltd.) were added to the mixture while stirring slowly. The mixture was stirred for 80 minutes to disperse evenly and form a semi-solid mixture. The semi-solid mixture was then ground 5 times by a three-roll mill to obtain a fine granular semi-solid material, which is the grinding intermediate.

[0064] 15 parts of chlorinated polypropylene resin (Wuhan Huaxiang Kejie Biotechnology Co., Ltd.) were added to 12 parts of ethyl acetate (Shandong Baihua Chemical Co., Ltd.), and the mixture was slowly stirred at 400 rpm until completely dissolved to form a homogeneous solution. The solution was then added to the grinding intermediate under continuous rapid stirring at 1000 rpm to form a homogeneous emulsion. The homogeneous emulsion was placed in a sealed container, and the mixture was slowly stirred at 500 rpm and heated to 45°C for drying. During the drying process, the sealed container was ventilated, and nitrogen gas was introduced to remove the organic solvents that had evaporated due to heat. The drying process was continued for 35 hours until the organic solvents had completely evaporated, resulting in a microcapsule-structured color-blocking pigment paste.

[0065] Add 25 parts of organosilicon-acrylate copolymer emulsion (Guangzhou Batai New Material Technology Co., Ltd.) to 25 parts of deionized water, stir at 1000 rpm to mix evenly, then add 5 parts of high molecular weight block copolymer containing pigment affinity groups (FS-229 Guangzhou Fangzhong Chemical Co., Ltd.), and continue stirring for 80 min until no obvious bubbles are present, to obtain a homogeneous mixture 1.

[0066] 10 parts of propylene glycol ethyl ether (Shandong Chenyu Chemical Co., Ltd.), 9 parts of glycerol (Jinan Zesheng Chemical Co., Ltd.), and 1 part of potassium sorbate (Jiangsu Jiujia Biotechnology Co., Ltd.) were stirred at 1000 rpm until homogeneous to obtain a homogeneous mixture 2. Mixture 1 and mixture 2 were stirred at 1000 rpm for 100 min until homogeneous to obtain mixture 3. 25 parts of color-blocking pigment paste were added to mixture 3 under slow stirring at 500 rpm and stirred for 120 min until homogeneous and free of obvious particles, thus obtaining a blue fluid acrylic pigment.

[0067] Example 4

[0068] Seven parts of dodecylphenol polyoxyethylene ether (Errek (Shandong) Chemical Group Co., Ltd.) and two parts of cellulose ether (Shanghai Kaiyin Chemical Co., Ltd.) were added to 31 parts of deionized water and stirred slowly at 400 rpm until completely dissolved to form a uniform mixture. Then, 20 parts of pigment titanium dioxide (Hebei Weicai Pigment Co., Ltd.) and 20 parts of pigment carbon black (Tianjin Yiborui Chemical Co., Ltd.) were added to the mixture while stirring slowly. The mixture was stirred for 80 minutes to disperse evenly and form a semi-solid mixture. The semi-solid mixture was then ground five times by a three-roll mill to obtain fine granular semi-solid material, which is the grinding intermediate.

[0069] Eight parts of styrene-maleic anhydride copolymer (Dongguan Jingke Polymer Co., Ltd.) were added to 12 parts of tetrahydrofuran (Jinan Qihang Chemical Technology Co., Ltd.). The mixture was slowly stirred at 400 rpm until completely dissolved and homogeneous. The mixture was then added to the grinding intermediate under continuous rapid stirring at 1000 rpm to form a homogeneous emulsion. The homogeneous emulsion was placed in a sealed container, and the mixture was slowly stirred at 500 rpm and heated to 45°C for drying. During the drying process, the sealed container was ventilated, and nitrogen gas was introduced to remove the organic solvents that had evaporated due to heat. The drying process was continued for 35 hours until the organic solvents had completely evaporated, resulting in a microcapsule-structured color-blocking pigment paste.

[0070] Add 23.5 parts of all-acrylate copolymer emulsion (Jinan Yuanxiang Chemical Co., Ltd.) to 35 parts of deionized water, stir at 1000 rpm to mix evenly, then add 3 parts of polyphosphate solution (Shanghai Hongjun New Material Technology Co., Ltd.), and continue stirring for 80 minutes until no obvious bubbles are present, to obtain a homogeneous mixture 1.

[0071] Eight parts of dipropylene glycol monomethyl ether (Yangzhou Longfei Environmental Protection New Materials Co., Ltd.), ten parts of isopropanol (Wuxi Yuanzhiquan Chemical Products Co., Ltd.), and 0.5 parts of sodium dehydroacetate (Langfang Qianyao Technology Co., Ltd.) were stirred at 1000 rpm until homogeneous to obtain a homogeneous mixture 2. Mixture 1 and mixture 2 were stirred at 1000 rpm for 100 min until homogeneous to obtain mixture 3. Twenty parts of color-blocking pigment paste were added to mixture 3 under slow stirring at 500 rpm and stirred for 120 min until homogeneous and free of obvious particles, thus obtaining a gray fluid acrylic pigment.

[0072] Comparative Example 1

[0073] Ten parts of octadecyl alcohol polyoxyethylene ether (Taizhou Jiayin Chemical Co., Ltd.), four parts of sodium carboxymethyl cellulose (Shaanxi Rankang Biotechnology Co., Ltd.), and 35 parts of deionized water were added and stirred slowly at 400 rpm until completely dissolved to form a uniform mixture. Then, 33 parts of pigment red powder (Anhui Jingzhicai New Material Co., Ltd.) were added to the mixture while stirring slowly and stirred for 80 minutes to disperse evenly into a semi-solid mixture. The semi-solid mixture was then ground five times by a three-roll mill to obtain a fine granular semi-solid material, thus obtaining the ground pigment paste.

[0074] Add 20 parts of styrene-acrylate copolymer emulsion (Langfang Bingxian New Building Materials Co., Ltd.) to 25 parts of deionized water, stir at 1000 rpm until uniformly mixed, then add 3 parts of acrylic block copolymer (Efka PX4701 Shanghai Jingyan Chemical Co., Ltd.), and continue stirring for 80 minutes until no obvious bubbles are present, to obtain a uniform mixture 1.

[0075] 12 parts of ethylene glycol butyl ether (Jinan Qizhi Chemical Technology Co., Ltd.), 9.5 parts of ethylene glycol (Wuxi Yuanzhiquan Chemical Products Co., Ltd.), and 0.5 parts of sodium benzoate (Langfang Qianyao Technology Co., Ltd.) were stirred at 1000 rpm until homogeneous to obtain a homogeneous mixture 2. Mixture 1 and mixture 2 were stirred at 1000 rpm for 100 minutes until homogeneous to obtain mixture 3. 30 parts of pigment paste were added to mixture 3 while stirring slowly at 500 rpm, and stirred for 120 minutes until homogeneous and free of obvious particles, thus obtaining a red fluid acrylic pigment.

[0076] Comparative Example 2

[0077] 10 parts of polyethylene glycol glycerol ether (Nantong Xitai Chemical Co., Ltd.), 2 parts of xanthan gum (Henan Xinzhiyuan Chemical Products Co., Ltd.), and 33 parts of deionized water were added and stirred slowly at 400 rpm until completely dissolved to form a uniform mixture. Then, 30 parts of lemon yellow pigment (Linyi Xinlei Pigment Co., Ltd.) and 5 parts of transparent yellow pigment (Xinxiang Deke Effect Pigment Co., Ltd.) were added to the mixture while stirring slowly. The mixture was stirred for 80 minutes to disperse evenly and form a semi-solid mixture. The semi-solid mixture was then ground 5 times by a three-roll mill to obtain a fine granular semi-solid material, which yielded the ground color paste.

[0078] Add 15 parts of acrylate-ethylene tert-carbonate copolymer emulsion (Shandong Li'ang New Material Technology Co., Ltd.) to 29 parts of deionized water, stir at 1000 rpm until homogeneous, then add 5 parts of polyoxyethylene-styrene polymer (HH2003F Guangzhou Houhuan Chemical Additives Co., Ltd.), and continue stirring for 80 minutes until no obvious bubbles are present, to obtain a homogeneous mixture 1.

[0079] 12 parts of propylene glycol methyl ether (Jiangyin Ouchen Chemical Co., Ltd.), 8 parts of propylene glycol (Jinan Zesheng Chemical Co., Ltd.), and 1 part of p-hydroxybenzoic acid (Jiangsu Jiujia Biotechnology Co., Ltd.) were stirred at 1000 rpm until homogeneous to obtain a homogeneous mixture 2. Mixture 1 and mixture 2 were stirred at 1000 rpm for 100 min until homogeneous to obtain mixture 3. 30 parts of pigment paste were added to mixture 3 under slow stirring at 500 rpm and stirred for 120 min until homogeneous and free of obvious particles, thus obtaining a yellow fluid acrylic pigment.

[0080] The acrylic pigments prepared in Examples 1-4 and Comparative Examples 1-2 were tested using the following methods:

[0081] Paintability Test: Following the standard QB-T 4289-2012 Acrylic Paint, use a 12mm texture brush to apply the sample at 150g / m². 2 ~200g / m 2Apply paint evenly to drawing paper, and grade the descriptive quality after it dries.

[0082] Advantages: Smooth drawing, vibrant colors, and even color application;

[0083] Good: The drawing is fluent, but the colors are average, and the swatches are unevenly colored.

[0084] Poor: The drawing is not smooth, the colors are dull, and the swatches are unevenly colored.

[0085] Fineness test: Use a QXD-100 scraper fineness tester. Take one part of the sample, add three parts of No. 3 ink, mix thoroughly with a mixing knife on a white porcelain plate, then take a portion of it and place it on the top of the fineness tester and scrape it down from top to bottom with a scraper. The reading limit is indicated by the number of densely packed particles exceeding 15 points.

[0086] Lightfastness test: The sample is evenly coated onto drawing paper using a coating machine. After it dries naturally, it is placed in a lightfastness tester along with wool strips conforming to GB / T730-2008 and exposed to sunlight for 72 hours. The grade is then determined after the sample is removed.

[0087] Cold resistance test: The sample is placed in a refrigerator at (-18±2)℃ and frozen for 24 hours. After being taken out and restored to room temperature, the sample is observed to see if there are any abnormalities.

[0088] Safety: Sample pretreatment, determination of the amount of transferred elements, and evaluation of results shall be carried out in accordance with the provisions of EN71-3.

[0089] The test results are shown in Table 1 below.

[0090] Table 1

[0091]

[0092] The test results in Table 1 demonstrate that the fluid acrylic pigments prepared by this invention, due to their unique pigment preparation process and special modification, exhibit superior paintability and lightfastness compared to acrylic pigments prepared using conventional methods. This is because the pigments undergo more stringent dispersion treatment, resulting in significantly improved dispersibility and more vibrant colors. Regarding lightfastness, the unique microcapsule structure of the pigments greatly reduces the damaging effects of light on pigment molecules, leading to a significant improvement in lightfastness. Furthermore, the coating of the pigments with a film does not significantly reduce the overall fineness of the pigment system; it remains comparable to pigments without a coating structure, maintaining high fineness. Additionally, the fluid acrylic pigments prepared by this invention meet the standard requirements for cold resistance and safety.

[0093] To verify the difference in color mixing properties between the acrylic pigments prepared in Examples 1-4 and Comparative Examples 1-2, a quantitative color mixing property test was conducted on the prepared acrylic pigments. The test method followed the CIE Lab test in GB / T 8424.1-2001 "Textiles - Tests for Color Fastness - Determination of Surface Color". The CIE Lab test, proposed by the International Commission on Illumination (CIE) in 1976, divides the color space into three channels based on the human eye's color perception characteristics: luminance (L), red-green (a), and yellow-blue (b). The specific implementation is as follows:

[0094] The sample was prepared according to the standard "QB-T 4289-2012 Acrylic Paint" using a 12mm texture brush at a concentration of 150g / m². 2 ~200g / m 2 The drawing is applied evenly on the drawing paper, and after it dries, it is tested using a colorimeter that meets the requirements of GB / T8424.1-2001.

[0095] The color L, a, and b values ​​of test examples 1-4 were tested respectively as color standard sample values, numbered ①-④;

[0096] After mixing Example 1 and Example 2, the L, a, and b values ​​of different regions of the mixed color were measured, numbered ⑤-⑥, and compared with ①-②.

[0097] After mixing Examples 3 and 4, the L, a, and b values ​​of different regions of the mixed color were measured, numbered ⑦-⑧, and compared with ③-④.

[0098] The color L, a, and b values ​​of Comparative Example 1 and Comparative Example 2 were used as color standard sample values, numbered ⑨-⑩;

[0099] After mixing comparative examples 1 and 2, the L, a, and b values ​​of different regions of the mixed color were measured, with the following serial numbers: And compare it with ⑨-⑩.

[0100] The test results are shown in Table 2-4.

[0101] Table 2

[0102]

[0103]

[0104] Table 3

[0105] Serial Number L a b ③ 49.03 -14.77 -45.12 ④ 67.46 -0.36 2.48 ⑦ 49.12 -15.01 -45.21 ⑧ 67.41 -0.35 2.43

[0106] Table 4

[0107]

[0108] Comparing the test data in Table 2-4, it can be seen that the L, a, b values ​​of the fluid acrylic paint prepared using the method of this invention, after mixing different colors, are quite close to the L, a, b values ​​of the original colors at different boundary positions, showing no obvious color mixing phenomenon. However, for acrylic paints prepared without this color-blocking pigment paste, the L, a, b values ​​after mixing are significantly different from the original colors, indicating a significant color mixing phenomenon. The clear boundary after mixing improves the painting performance of fluid acrylic paints, greatly enhancing the sense of layering and three-dimensionality of the artwork, improving the unique "fluid" properties of fluid acrylic paints, and ultimately enhancing the quality of the acrylic paints.

[0109] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A propylene pigment, characterized by, The color-blocking pigment composition is prepared by coating pigment particles with a resin, including: The resin coating the pigment particles includes: An emulsifier is dissolved in deionized water to form a mixture a; The pigment particles are added to the mixture a to form a semi-solid mixture b; The resin is added to a solvent to form a mixture d; The mixture d is added to the semi-solid mixture b to form an emulsion e; and The solvent is removed from the emulsion e to form the color-blocking pigment composition; The emulsifier has a hydrophilic-hydrophobic molecular chain; The resin is one or more of a phenolic resin, an aldehyde-ketone resin, a polyvinyl butyral, a chlorinated polypropylene resin, a polyimide, and a styrene-maleic anhydride copolymer; The solvent is one or more of toluene, xylene, dichlorotoluene, chloroform, ethyl acetate, tetrahydrofuran, acetone, diethyl ether, and dimethyl ether; The acrylic paint includes 10-30 parts by weight of an acrylic emulsion, 5-15 parts by weight of a film-forming agent, 5-15 parts by weight of a diluent, 1-8 parts by weight of a dispersant, 0.1-3 parts by weight of a mildew-proof fungicide, 20-40 parts by weight of deionized water, and 10-40 parts by weight of the color-blocking pigment composition, wherein the total weight of all components in the acrylic paint is 100 parts.

2. The propylene pigment according to claim 1, characterized in that, The emulsifier is one or more of a fatty alcohol polyoxyethylene ether, a fatty acid glyceride polyoxyethylene ether, a polyethylene glycol polyether, a polyoxyethylene alkyl phenol ether, and a polyoxyethylene polyoxypropylene block copolymer.

3. The propylene pigment according to claim 1, characterized in that, The mixture a further includes a thickening agent.

4. The propylene pigment according to claim 1, characterized in that, The semi-solid mixture b is processed into an intermediate product c having a predetermined particle size before the mixture d is added to the semi-solid mixture b to form an emulsion e', and the solvent is removed from the emulsion e' to form the color-blocking pigment composition.

5. The propylene pigment according to claim 3, characterized in that, The total weight of all components in the color-blocking pigment composition is 100 parts, wherein the pigment particles are 20-50 parts by weight, the resin is 5-20 parts by weight, the emulsifier is 5-20 parts by weight, the thickening agent is 1-5 parts by weight, the solvent is 10-20 parts by weight, and the deionized water is 20-40 parts by weight.

6. The propylene pigment according to claim 1, characterized in that, The pigment particles are one or more of inorganic pigment particles and organic pigment particles.

7. The propylene pigment according to claim 6, characterized in that, The inorganic pigment and the organic pigment are one or more of titanium dioxide, zinc oxide, lithopone, lead chrome yellow, iron yellow, lead chromate silicate, strontium calcium yellow, transparent yellow, benzidine yellow, Hansa yellow, lemon yellow, iron red, large red powder, chrome red, transparent red, phthalocyanine blue, ultramarine, carbon black, iron black, and aniline black.

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