Acrylic pigment rod and manufacturing method thereof

Abstract

The invention discloses an acrylic pigment rod and a manufacturing method thereof. The acrylic pigment rod comprises the following raw materials: 30-60% of a solvent, 3-18% of a water-soluble adhesive, 5-15% of stearic acid, 5-20% of a sodium hydroxide solution, 8-15% of a humectant, 1-3% of a dispersant and 3-10% of a pigment. The water-soluble adhesive contains a water-soluble acrylic resin. The preparation method comprises the following steps: uniformly mixing the pigment, the dispersing agent and part of the humectant, grinding to obtain a color paste, dissolving the water-soluble adhesive in the solvent to obtain an adhesive solution, and putting the stearic acid, the sodium hydroxide solution, the humectant and the color paste into the adhesive solution to obtain a pigment semi-finished product; and pouring the pigment semi-finished product into a pen body mold, and cooling and molding to obtain the acrylic pigment rod. The manufacturing method is simple and reasonable, and the obtained acrylic pigment rod has the advantages that the acrylic pigment rod can be used for smoothly writing and drawing on various base materials, is good in covering power and soluble in water, and enables a picture to have a shading effect; and the market demand is met.

Description

Technical Field

[0001] The invention relates to the technical field of pigments, in particular to an acrylic pigment stick and a manufacturing method thereof. Background Art

[0002] As is known to all, acrylic paint is a new type of paste-like painting pigment mixed with acrylic emulsion, color particles and various additives (including thickeners, fillers, etc.), which is generally filled into paint bottles (boxes) or aluminum tubes for use. In the above raw material composition of acrylic paint, acrylic emulsion is a high molecular polymer emulsion with a molecular weight generally between 10,000 and 50,000, which is obtained by polymerization reaction of acrylic monomers containing double bonds (such as one or more of acrylic acid, methacrylic acid, vinyl acrylic acid, ethyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, etc.) under the conditions of initiator and emulsifier, and is used as an adhesive.

[0003] Acrylic paint itself is a water-soluble paint, but after drying, the acrylic emulsion in the acrylic paint will form a water-resistant film with good water resistance, making the paint coating water-resistant. In this way, when consumers use acrylic paint, they need to squeeze the acrylic paint (paste) onto the palette and dip it or mix the color before use, which makes it inconvenient to carry and create, and it is easy to stain the skin and clothes.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to overcome the above defects, the present invention provides an acrylic paint stick and a production method thereof. The production method is simple, reasonable and easy to operate. The prepared acrylic paint stick has many advantages, such as being able to write and draw smoothly on various substrates, having bright colors and good covering power, being easy to overlap colors, being water-soluble after the coating is dried, and making the picture have a smudge effect, etc.; the market demand is well met.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an acrylic paint stick, which has the following raw material formula by weight percentage: 30% to 60% of solvent, 3% to 18% of water-soluble adhesive, 5% to 15% of stearic acid, 5% to 20% of sodium hydroxide solution, 8% to 15% of moisturizing agent, 1% to 3% of dispersant and 3% to 10% of pigment; wherein the water-soluble adhesive contains a water-soluble acrylic resin with a molecular weight of 1000 to 10000.

[0007] As a further improvement of the present invention, based on the total weight of the raw materials of the acrylic paint stick, the water-soluble adhesive is composed of 3% to 15% of a water-soluble acrylic resin and 0% to 3% of an adhesive auxiliary material; wherein the molecular weight of the water-soluble acrylic resin is 3000 to 8500; and the adhesive auxiliary material is selected from at least one of polyvinyl alcohol, cellulose, gum arabic, dextrin and maleic acid resin.

[0008] As a further improvement of the present invention, the bonding auxiliary material accounts for 10% to 20% of the total weight of the water-soluble adhesive.

[0009] As a further improvement of the present invention, based on the total weight of the raw materials of the acrylic paint stick, the solvent consists of 30% to 55% water and 0% to 5% ammonia solution; wherein the water is selected from distilled water or purified water, and the concentration of the ammonia solution is 25%.

[0010] As a further improvement of the present invention, the ammonia solution accounts for 0.8% to 5% of the total weight of the raw materials of the acrylic paint sticks.

[0011] As a further improvement of the present invention, the moisturizing agent is selected from at least one of glycerin, propylene glycol, polyethylene glycol, 1,3-butylene glycol and sorbitol.

[0012] As a further improvement of the present invention, based on the total weight of the raw materials of the acrylic paint stick, the moisturizing agent is composed of 5% to 10% propylene glycol and 3% to 5% sorbitol.

[0013] As a further improvement of the present invention, the concentration of the sodium hydroxide solution is 10%; and the dispersant is a water-soluble polymer dispersant.

[0014] The present invention also provides a method for making an acrylic paint stick, comprising the following steps:

[0015] S1: uniformly mix the formulated amount of pigment and dispersant, and a part of the moisturizer, and put them into a grinding device for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use;

[0016] S2: firstly putting a formulated amount of solvent into a reaction kettle, then putting a formulated amount of water-soluble adhesive into the solvent in a manner of adding while stirring, and then heating and stirring until the water-soluble adhesive is completely dissolved to obtain an adhesive solution;

[0017] S3: adding a formulated amount of stearic acid to the obtained adhesive solution, stirring until the stearic acid is completely melted, and then adding a formulated amount of sodium hydroxide solution to perform a saponification reaction; after the saponification reaction is performed for a set time, adding the remaining moisturizer and the color paste obtained in S1, and continuing to stir until mixed to obtain a pigment semi-finished product;

[0018] S4: pouring the obtained semi-finished pigment into a pen body mold, and obtaining the acrylic pigment stick after cooling and molding.

[0019] As a further improvement of the present invention, in the above S1, the grinding equipment is a three-roller grinder;

[0020] In the above S2, the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C;

[0021] In the above S3, the pH value of the obtained pigment semi-finished product is 9-10.

[0022] The beneficial effects of the present invention are as follows: ① The present invention optimizes and innovates the raw material formula of the acrylic paint stick, so that the acrylic paint stick has the following advantages: it can write and paint smoothly on various substrates, has bright colors and good covering power, is easy to overlap colors, and is water-soluble after the coating is dried, so that the picture has a smudge effect, and many other advantages; it meets the market demand very well. ② The preparation method of the acrylic paint stick provided by the present invention is simple, reasonable, and easy to operate, and the relevant raw materials are easy to obtain, the cost is not high, and it is more environmentally friendly. ③ The acrylic paint stick obtained by the present invention has a simple structure and is convenient to carry and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the method for making the acrylic paint stick of the present invention;

[0024] Figure 2 The tinting test diagrams are of the acrylic paint stick obtained in Example 2 of the present invention and the paint stick comparison sample obtained in Comparative Example 1 painted on dry and clean glass respectively; wherein, Figure 2 Figure (a) is a test diagram of the colorability of the paint stick obtained in Comparative Example 1 painted on glass; Figure (b) is a test diagram of the colorability of the acrylic paint stick obtained in Example 2 painted on glass;

[0025] Figure 3 The test charts are the test results of the acrylic paint stick obtained in Example 4 of the present invention and the paint stick comparison sample obtained in Comparative Example 1 for the coverage test; wherein, Figure 3 Figure (A) is a test chart of the covering property test of the pigment stick obtained in Comparative Example 1; Figure (B) is a test chart of the covering property test of the acrylic pigment stick obtained in Example 4. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to specific embodiments, but the present invention is not limited to these embodiments.

[0027] The present invention discloses an acrylic paint stick and a method for making the same. The method is simple, reasonable and easy to operate. The acrylic paint stick has the advantages of being able to write and draw smoothly on various substrates, having bright colors and good covering power, being easy to overlap colors, being water-soluble after the coating is dried, and making the picture have a smudge effect, etc., and the market demand is well met. The reason for this is that the present invention optimizes and innovates the raw material formula of the acrylic paint stick. The specific description is as follows:

[0028] 1. Making the acrylic paint stick of the present invention;

[0029] Embodiment 1:

[0030] This embodiment 1 provides an acrylic paint stick, which is made by the following production steps: Figure 1 As shown,

[0031] S1: 0.5 kg of titanium dioxide, 8 kg of red iron oxide, 2 kg of water-soluble polymer dispersant (such as dispersant Solsperse 27000) and 2 kg of propylene glycol are mixed evenly and put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use. It can be understood that the obtained color paste is a paste, and further, the fineness of the obtained color paste can be preferably controlled to be 20 μm ± 5 μm.

[0032] S2: First, 47.74 kg of pure water and 3.5 kg of 25% ammonia solution (i.e., the concentration of the ammonia solution is 25%) are added to the reactor, and then 11 kg of water-soluble acrylic resin (molecular weight is preferably 3000-8500) is added to the above solvent (i.e., a mixture of pure water and 25% ammonia solution) in a stirring and adding manner, and then heated and stirred until the water-soluble acrylic resin is completely dissolved to obtain an adhesive solution; it can be understood that during the above heating and stirring process, the ammonia solution will promote the rapid dissolution of the water-soluble acrylic resin and can also adjust the entire reaction system to be in an alkaline environment; then the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C to facilitate a good saponification reaction in the subsequent process.

[0033] S3: Add 8 kg of stearic acid to the obtained adhesive solution, and after stirring until the stearic acid is completely melted, slowly add 11.26 kg of 10% sodium hydroxide solution (i.e., the concentration of the sodium hydroxide solution is 10%) to carry out a saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 3 kg of propylene glycol, 3 kg of sorbitol, and the color paste obtained in S1 in turn, continue stirring until mixed, and obtain a pigment semi-finished product with a pH value of 9 to 10.

[0034] S4: Pour the obtained semi-finished pigment into a pen body mold, and after cooling to room temperature, the acrylic pigment stick I can be obtained.

[0035] Embodiment 2:

[0036] This embodiment 2 also provides an acrylic paint stick, which is made by the following production steps:

[0037] S1: 2.5 kg of titanium dioxide, 4 kg of permanent yellow, 1.5 kg of water-soluble polymer dispersant (such as dispersant Solsperse 27000) and 5 kg of propylene glycol are mixed evenly and put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use. It can be understood that the obtained color paste is a paste, and further, the fineness of the obtained color paste can be preferably controlled to be 15 μm ± 5 μm.

[0038] S2: First, 39.35 kg of pure water and 0.95 kg of 25% ammonia solution are added to the reactor, and then 3 kg of water-soluble acrylic resin (molecular weight is preferably 3000-8500) is added to the above solvent (i.e., a mixture of pure water and 25% ammonia solution) in a stirring and adding manner, and then heated and stirred until the water-soluble acrylic resin is completely dissolved to obtain an adhesive solution; it is understandable that during the above heating and stirring process, the ammonia solution will promote the rapid dissolution of the water-soluble acrylic resin and can also adjust the entire reaction system to be in an alkaline environment; then the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C to facilitate a good saponification reaction in the subsequent process.

[0039] S3: Add 14 kg of stearic acid to the obtained adhesive solution, and after stirring until the stearic acid is completely melted, slowly add 19.7 kg of 10% sodium hydroxide solution to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 5 kg of propylene glycol, 5 kg of sorbitol, and the color paste obtained in S1 in turn, continue stirring until mixed, and obtain a pigment semi-finished product with a pH value of 9 to 10.

[0040] S4: Pour the obtained semi-finished pigment into a pen body mold, and after cooling to room temperature, the acrylic pigment stick II can be formed.

[0041] Embodiment 3:

[0042] This embodiment 3 also provides an acrylic paint stick, which is made by the following production steps:

[0043] S1: 5 kg of titanium dioxide, 5 kg of permanent red, 3 kg of water-soluble polymer dispersant (such as dispersant Solsperse W100) and 3 kg of propylene glycol are mixed evenly and then put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use. It can be understood that the obtained color paste is a paste, and further, the fineness of the obtained color paste can be preferably controlled to be 20 μm ± 5 μm.

[0044] S2: First, 47.19 kg of pure water and 4.77 kg of 25% ammonia solution are added to the reactor, and then 15 kg of water-soluble acrylic resin (molecular weight is preferably 3000-8500) is added to the above solvent (i.e., a mixture of pure water and 25% ammonia solution) in a stirring and adding manner, and then heated and stirred until the water-soluble acrylic resin is completely dissolved to obtain an adhesive solution; it is understandable that during the above heating and stirring process, the ammonia solution will promote the rapid dissolution of the water-soluble acrylic resin and can also adjust the entire reaction system to be in an alkaline environment; then the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C to facilitate a good saponification reaction in the subsequent process.

[0045] S3: Add 5 kg of stearic acid to the obtained adhesive solution, and after stirring until the stearic acid is completely melted, slowly add 7.04 kg of 10% sodium hydroxide solution to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 2 kg of propylene glycol, 3 kg of sorbitol, and the color paste obtained in S1 in turn, continue stirring until mixed, and obtain a pigment semi-finished product with a pH value of 9 to 10.

[0046] S4: Pour the obtained semi-finished pigment into a pen body mold, and after cooling to room temperature, the acrylic pigment stick III can be formed.

[0047] Embodiment 4:

[0048] This embodiment 4 also provides an acrylic paint stick, which is made by the following production steps:

[0049] S1: 6 kg of titanium dioxide, 3 kg of permanent pink, 2.5 kg of water-soluble polymer dispersant (such as dispersant Solsperse W100) and 3 kg of 1,3-butanediol are mixed evenly and put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use. It can be understood that the obtained color paste is a paste, and further, the fineness of the obtained color paste can be preferably controlled to be 15 μm ± 5 μm.

[0050] S2: First, 44.11 kg of distilled water and 2.39 kg of 25% ammonia solution are added to the reactor, and then 1.5 kg of cellulose and 6 kg of water-soluble acrylic resin (molecular weight is preferably 3000-8500) are added to the above solvent (i.e., a mixture of pure water and 25% ammonia solution) in a stirring and adding manner, and then heated and stirred until the water-soluble acrylic resin and the cellulose are completely dissolved to obtain an adhesive solution; it can be understood that during the above heating and stirring process, ① the ammonia solution will promote the rapid dissolution of the water-soluble acrylic resin and can also adjust the entire reaction system to an alkaline environment; ② while the cellulose plays a thickening role, the gelatinized cellulose can also promote the improvement of the hydrophilicity of the water-soluble acrylic resin; then the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C to facilitate the good saponification reaction in the subsequent process.

[0051] S3: Add 10 kg of stearic acid to the obtained adhesive solution, and after stirring until the stearic acid is completely melted, slowly add 12.5 kg of 10% sodium hydroxide solution to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 5 kg of propylene glycol, 4 kg of sorbitol, and the color paste obtained in S1 in turn, continue stirring until mixed, and obtain a pigment semi-finished product with a pH value of 9 to 10.

[0052] S4: Pour the obtained semi-finished pigment into a pen body mold, and after cooling to room temperature, the acrylic pigment stick IV can be formed.

[0053] Embodiment 5:

[0054] This embodiment 5 also provides an acrylic paint stick, which is made by the following production steps:

[0055] S1: 6Kg of titanium dioxide, 2Kg of permanent violet, 2Kg of water-soluble polymer dispersant (such as dispersant Solsperse W100) and 3Kg of 1,3-butanediol are mixed evenly and put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use. It can be understood that the obtained color paste is a paste, and further, the fineness of the obtained color paste can be preferably controlled to be 20 μm ± 5 μm.

[0056] S2: First, 46.32 kg of distilled water and 3.18 kg of 25% ammonia solution are added to the reactor, and then 1 kg of dextrin and 9 kg of water-soluble acrylic resin (molecular weight is preferably 3000-8500) are added to the above solvent (i.e., a mixture of pure water and 25% ammonia solution) in a stirring and adding manner, and then heated and stirred until the water-soluble acrylic resin and the dextrin are completely dissolved to obtain an adhesive solution; it can be understood that during the above heating and stirring process, ① the ammonia solution will promote the rapid dissolution of the water-soluble acrylic resin and can also adjust the entire reaction system to an alkaline environment; ② while the dextrin plays a thickening role, the gelatinized dextrin can also promote the improvement of the hydrophilicity of the water-soluble acrylic resin; then the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C to facilitate the good saponification reaction in the subsequent process.

[0057] S3: Add 7 kg of stearic acid to the obtained adhesive solution, and after stirring until the stearic acid is completely melted, slowly add 13.5 kg of 10% sodium hydroxide solution to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 3 kg of 1,3-butanediol, 4 kg of sorbitol, and the color paste obtained in S1 in turn, continue stirring until mixed, and obtain a pigment semi-finished product with a pH value of 9 to 10.

[0058] S4: pouring the obtained semi-finished pigment into a pen body mold, and cooling it to room temperature to obtain an acrylic pigment stick V.

[0059] Embodiment 6:

[0060] This embodiment 6 also provides an acrylic paint stick, which is made by the following production steps:

[0061] S1: 2 kg of titanium dioxide, 4 kg of phthalocyanine blue, 1.5 kg of a water-soluble polymer dispersant (such as dispersant Solsperse 27000) and 2 kg of propylene glycol are mixed evenly and then put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use. It can be understood that the obtained color paste is a paste, and further, the fineness of the obtained color paste can be preferably controlled to be 20 μm ± 5 μm.

[0062] S2: First, 51 kg of distilled water and 5 kg of 25% ammonia solution are added to the reactor, and then 2 kg of cellulose, 1 kg of gum arabic and 13 kg of water-soluble acrylic resin (molecular weight is preferably 3000-8500) are added to the above solvent (i.e., a mixture of pure water and 25% ammonia solution) while stirring, and then heated and stirred until the water-soluble acrylic resin, cellulose and gum arabic are completely dissolved to obtain an adhesive solution; it can be understood that during the above heating and stirring process, ① the ammonia solution will promote the rapid dissolution of the water-soluble acrylic resin and can also adjust the entire reaction system to an alkaline environment; ② while cellulose and gum arabic play a thickening role, the gelatinized cellulose can also promote the improvement of the hydrophilicity of the water-soluble acrylic resin; then the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C to facilitate the good saponification reaction in the subsequent process.

[0063] S3: Add 5 kg of stearic acid to the obtained adhesive solution, and after stirring until the stearic acid is completely melted, slowly add 7.5 kg of 10% sodium hydroxide solution to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 3 kg of propylene glycol, 3 kg of 1,3-butanediol, and the color paste obtained in S1 in turn, continue to stir until mixed, and obtain a pigment semi-finished product with a pH value of 9 to 10.

[0064] S4: pouring the obtained semi-finished pigment into a pen body mold, and cooling it to room temperature to obtain an acrylic pigment stick VI.

[0065] 2. Make comparative samples;

[0066] Comparative Example 1:

[0067] Comparative Example 1 provides a pigment stick comparison sample, which is made using the following production steps:

[0068] S1: 2.5 kg of titanium dioxide, 4 kg of permanent yellow, 1.5 kg of water-soluble polymer dispersant (such as dispersant Solsperse W100) and 2 kg of propylene glycol are mixed evenly and put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use.

[0069] S2: First, add 59.92 kg of pure water into the reactor, then add 10 kg of stearic acid into the above pure water, and after stirring until the stearic acid is completely melted, slowly add 14.08 kg of 10% sodium hydroxide solution to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), add 3 kg of propylene glycol, 3 kg of sorbitol, and the color paste prepared in S1 in turn, continue stirring until mixed, and obtain the pigment semi-finished product A.

[0070] S3: pouring the obtained pigment semi-finished product A into a pen body mold, and after cooling to room temperature, the pigment stick comparison sample A (also a colorful stick currently available on the market) can be formed.

[0071] Comparative Example 2:

[0072] Comparative Example 2 also provides a pigment stick comparison sample, which is made using the following production steps:

[0073] S1: 2 kg of titanium dioxide, 1.5 kg of phthalocyanine blue, 1.3 kg of a water-soluble polymer dispersant (such as dispersant Solsperse W100) and 2 kg of propylene glycol are mixed evenly and put into a three-roll mill for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use.

[0074] S2: First, 52.94 kg of pure water was added to the reactor, and then 15 kg of acrylic emulsion was added to the pure water while stirring, and then heated and stirred until the acrylic emulsion was completely dissolved to obtain an adhesive solution. * .

[0075] S3: Add 8 kg of stearic acid into the obtained adhesive solution * After stirring until the stearic acid is completely melted, 11.26 kg of 10% sodium hydroxide solution is slowly added to carry out saponification reaction; after the saponification reaction is carried out for a set time (such as 10 minutes), 3 kg of propylene glycol, 3 kg of sorbitol, and the color paste prepared in S1 are added in sequence, and stirring is continued until mixed to obtain a pigment semi-finished product B (also a commercially available acrylic pigment).

[0076] S4: Pour the obtained pigment semi-finished product B into a pen body mold, and after cooling to room temperature, a pigment stick comparison sample B can be obtained.

[0077] Note: The suffixes "Ⅰ", "Ⅱ"... "Ⅵ", "A", "B", etc. (such as acrylic paint stick Ⅰ, acrylic paint stick Ⅱ, paint stick comparison sample A, paint stick comparison sample B, etc.) in the component names in this application specification are only for the convenience of description and are not used to limit the scope of implementation of the patent of this invention.

[0078] 3. Pigment stick performance test;

[0079] 3.1) Performance test method of pigment stick;

[0080] The acrylic paint sticks prepared in Examples 1 to 6 of the present invention and the paint stick comparison samples prepared in Comparative Examples 1 to 2 were respectively subjected to performance tests, including:

[0081] ① Colorability test:

[0082] Use a paint stick to paint on a dry, clean, smooth substrate such as glass, ceramic, or plastic to check whether it can be colored and the state of the painted lines.

[0083] ② Coverage test:

[0084] First, use a paint stick of one color to apply a 30×30mm paint block (which can be understood as the "base color") on the tile. After the above block is dry, use a paint stick of another color to write and draw on the block to check whether the second coating can cover the block (base color) and whether it can be presented normally.

[0085] ③Adhesion test:

[0086] Use a paint stick to draw five consecutive circles with a diameter of 20 to 30 mm on the glass plate. After 1 minute, cover the circles with two layers of medical gauze, press a 500g special weight on them, and dry-rub back and forth 5 times to check whether the circles are erased.

[0087] ④Water solubility test:

[0088] Use a paint stick to paint on A4 paper, then use a brush dipped in water to rub back and forth on the coating 3 times to check whether it is water-soluble.

[0089] 3.2) Performance test results of pigment sticks;

[0090] Table 1 below shows the performance test results of the acrylic paint sticks obtained in Examples 1 to 6 of the present invention and the paint stick comparison samples obtained in Comparative Examples 1 to 2.

[0091] Table 1 Performance test results of acrylic paint sticks obtained in the present invention and paint stick comparison samples

[0092]

[0093] In order to better understand and demonstrate the performance test results of the above-mentioned pigment stick, the present invention also provides the attached Figure 2 and attached Figure 3 , among which, Figure 2 The tinting test diagrams of the acrylic paint stick obtained in Example 2 of the present invention and the paint stick comparison sample obtained in Comparative Example 1 painted on dry and clean glass are shown; Figure 3 The test graphs of the acrylic paint stick obtained in Example 4 of the present invention and the paint stick comparison sample obtained in Comparative Example 1 respectively undergoing covering property tests are shown.

[0094] From the attached Figure 2 It can be seen from the figure that the acrylic paint stick obtained in Example 2 of the present invention is easy to color when painting on glass, and the traces are full and smooth; Figure 2As shown in Figure (b) of the figure. However, when the pigment stick obtained in Comparative Example 1 is used for painting on glass, it is not easy to color, the line traces are shallow, and not smooth; Figure 2 As shown in Figure (a) in the figure, it can be understood that Figure 2 The colorability test chart shown is consistent with the colorability test results shown in Table 1.

[0095] From the attached Figure 3 It can be seen from the figure that the acrylic paint stick obtained in Example 4 of the present invention can completely cover the base color, as shown in the attached figure. Figure 3 As shown in Figure (B) in the figure; while the pigment stick comparison sample obtained in Comparative Example 1 cannot cover the base color and cannot be presented normally; as shown in the attached Figure 3 As shown in Figure (A) in the figure. Figure 3 The coverage test graph shown is consistent with the coverage test results shown in Table 1.

[0096] In summary, according to Table 1, Appendix Figure 2 and attached Figure 3 It can be seen that the pigment stick comparison sample obtained in Comparative Example 1 is water-soluble, so that a smudge effect can be achieved when writing or painting, but it cannot be written, painted, or attached to a smooth substrate. The pigment stick comparison sample obtained in Comparative Example 2 can be written, painted, or attached to a smooth substrate, but it is not water-soluble after drying, so that a smudge effect cannot be achieved when writing or painting. The acrylic pigment sticks prepared in Examples 1 to 6 can not only be written, painted, or attached smoothly on a smooth substrate, but are also water-soluble, so that a smudge effect can be achieved when writing or painting, enriching the painting skills of consumers, and the pigment that accidentally falls on the skin and clothing can be easily cleaned. It can be understood that the comprehensive performance of the acrylic pigment sticks prepared in the embodiments of the present invention is far superior to the pigment stick comparison samples prepared in Comparative Examples 1 and 2.

[0097] The reason why the acrylic paint stick prepared by the present invention can achieve the above advantages is that the present invention optimizes and innovates the raw material formula of the acrylic paint stick prepared by the present invention, which is specifically manifested in the following aspects: ① The present invention adopts water-soluble acrylic resin as the main material of the adhesive. On the one hand, based on the characteristics of acrylic resin, the acrylic paint stick can be smoothly written, painted, and attached on various substrates, especially smooth substrates. That is to say, the acrylic paint stick can be smoothly written, painted, and attached on various substrates such as paper, cloth, glass, plastic, ceramics, and metals; on the other hand, by virtue of the water solubility of the water-soluble acrylic resin, it can be ensured that the acrylic paint stick and the coating drawn by using the acrylic paint stick can still be water-soluble after drying. In this way, when using the acrylic paint stick for painting, a brush can be dipped in water to rub the surface of the coating to dissolve it according to the needs of painting, thereby achieving a smudge effect (similar to watercolor), and when the pigment is accidentally contaminated on the skin and / or clothing, it can be easily cleaned. In addition, the present invention also specifically optimizes the type of water-soluble acrylic resin, preferably using a water-soluble acrylic resin with a molecular weight of 1000 to 10000, and further preferably using a water-soluble acrylic resin with a molecular weight of 3000 to 8500. Based on the viscosity and water solubility of the above-mentioned types of water-soluble acrylic resins, the properties are in the most reasonable teaming state, which can not only make the coating drawn by the acrylic paint stick have excellent adhesion and covering power (easy to overlap colors), but also make the acrylic paint stick easy to pour and form. ② The present invention also preferably uses an ammonia solution and an adhesive auxiliary material, wherein the ammonia solution can promote the rapid dissolution of the water-soluble acrylic resin, greatly improve the production efficiency, and can cooperate with the sodium hydroxide solution to adjust the entire system to an alkaline environment, greatly improving the reaction stability of the entire system; the adhesive auxiliary material, while playing a thickening role, can also promote the improvement of the hydrophilicity of the water-soluble acrylic resin, thereby further improving the water solubility of the acrylic paint stick.

[0098] In summary, the present invention optimizes and innovates the raw material formula of the acrylic paint stick, so that the acrylic paint stick has the following advantages: being able to write and paint smoothly on various substrates, having bright colors and good covering power, being easy to overlap colors, being water-soluble after the coating is dried, and making the picture have a smudge effect, etc.; and the market demand is well met.

[0099] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An acrylic paint stick, characterized in that: The raw material formula is as follows, calculated by weight percentage: 30% to 60% solvent, 3% to 18% water-soluble adhesive, 5% to 15% stearic acid, 5% to 20% sodium hydroxide solution, 8% to 15% moisturizing agent, 1% to 3% dispersant and 3% to 10% pigment; Wherein, the water-soluble adhesive comprises a water-soluble acrylic resin with a molecular weight of 1000 to 10000.

2. The acrylic paint stick according to claim 1, characterized in that: Based on the total weight of the raw materials of the acrylic paint stick, the water-soluble adhesive consists of 3% to 15% of a water-soluble acrylic resin and 0% to 3% of an adhesive auxiliary material; wherein the molecular weight of the water-soluble acrylic resin is 3000 to 8500; and the adhesive auxiliary material is selected from at least one of polyvinyl alcohol, cellulose, gum arabic, dextrin and maleic acid resin.

3. The acrylic paint stick according to claim 2, characterized in that: The bonding auxiliary material accounts for 10% to 20% of the total weight of the water-soluble adhesive.

4. The acrylic paint stick according to claim 1, characterized in that: Based on the total weight of the raw materials of the acrylic paint stick, the solvent consists of 30% to 55% water and 0% to 5% ammonia solution; wherein the water is selected from distilled water or purified water, and the concentration of the ammonia solution is 25%.

5. The acrylic paint stick according to claim 4, characterized in that: The ammonia solution accounts for 0.8% to 5% of the total weight of the raw materials of the acrylic paint stick.

6. The acrylic paint stick according to claim 1, characterized in that: The moisturizing agent is selected from at least one of glycerin, propylene glycol, polyethylene glycol, 1,3-butylene glycol and sorbitol.

7. The acrylic paint stick according to claim 6, characterized in that: Based on the total weight of the raw materials of the acrylic paint stick, the moisturizing agent is composed of 5% to 10% of propylene glycol and 3% to 5% of sorbitol.

8. The acrylic paint stick according to claim 1, characterized in that: The concentration of the sodium hydroxide solution is 10%; the dispersant is a water-soluble polymer dispersant.

9. A method for making an acrylic paint stick as claimed in any one of claims 1 to 8, characterized in that: The production steps include: S1: uniformly mix the formulated amount of pigment and dispersant, and a part of the moisturizer, and put them into a grinding device for grinding to obtain a color paste with a fineness of 10 to 30 μm for standby use; S2: firstly putting a formulated amount of solvent into a reaction kettle, then putting a formulated amount of water-soluble adhesive into the solvent in a manner of adding while stirring, and then heating and stirring until the water-soluble adhesive is completely dissolved to obtain an adhesive solution; S3: adding a formulated amount of stearic acid to the obtained adhesive solution, stirring until the stearic acid is completely melted, and then adding a formulated amount of sodium hydroxide solution to perform a saponification reaction; after the saponification reaction is performed for a set time, adding the remaining moisturizer and the color paste obtained in S1, and continuing to stir until mixed to obtain a pigment semi-finished product; S4: pouring the obtained semi-finished pigment into a pen body mold, and obtaining the acrylic pigment stick after cooling and molding.

10. The method for making an acrylic paint stick according to claim 9, characterized in that: In the above S1, the grinding equipment is a three-roll grinder; In the above S2, the temperature of the obtained adhesive solution is maintained at 80°C ± 5°C; In the above S3, the pH value of the obtained pigment semi-finished product is 9-10.

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