Dispersing agent for water-based nano pigment color paste and preparation method of dispersing agent

Abstract

The invention discloses a dispersing agent for water-based nano pigment color paste, and relates to the technical field of water-based paint preparation, the dispersing agent comprises 50-150 parts of a polyether modified polyol compound, 30-80 parts of modified polyacrylate, 10-50 parts of a nonionic surfactant, 5-30 parts of a thickener, 700-850 parts of an environment-friendly solvent and 5-20 parts of a surface modifier; the invention further discloses a preparation method of the dispersing agent for the water-based nano pigment color paste. The preparation method comprises the following steps: preparing materials; adding the polyether modified polyol compound into the stirring container; adding modified polyacrylate into the polyether modified polyol compound solution; a nonionic surfactant is added; adding a thickening agent from a natural plant source; adding an environment-friendly solvent; and adding a surface modifier. The dispersing agent disclosed by the invention not only can effectively disperse pigment particles and prevent agglomeration of the pigment, but also can maintain good flowability and proper viscosity of the pigment and ensure high stability of color paste.

Description

Technical Field

[0001] The invention relates to the technical field of water-based coating preparation, and in particular to a dispersant for water-based nano pigment paste and a preparation method thereof. Background Art

[0002] As an important high-performance coating and printing material, water-based nano-pigment paste is widely used in coatings, inks, cosmetics, plastics and other industries. Water-based nano-pigment paste has low toxicity, low pollution and good environmental friendliness, and plays an increasingly important role in the coatings industry. However, the dispersibility, stability and rheological properties of nano-pigments are often key challenges in the production process.

[0003] In the preparation process of nano pigments, the use of dispersants plays a vital role. The role of dispersants is mainly to reduce the mutual attraction between pigment particles and prevent pigment particles from agglomerating, thereby improving the dispersibility and stability of pigments in aqueous solvents. In addition, the selection of dispersants needs to take into account the affinity between pigments and solutions, dispersion effect, rheological properties, and environmental friendliness of the final product. Existing water-based nano pigment dispersants mostly use traditional surfactants or high molecular weight thickeners. However, these dispersants often have problems such as insufficient stability, unsatisfactory dispersion effect or environmental pollution in practical applications. Therefore, the development of a new, environmentally friendly and excellently dispersible water-based nano pigment color paste dispersant has important application value. Summary of the invention

[0004] In order to solve the above technical problems, a dispersant for water-based nano-pigment paste and a preparation method thereof are provided. This technical solution solves the above problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A dispersant for water-based nano pigment paste, the dispersant is prepared from the following materials:

[0007] 50-150 parts of polyether modified polyol compounds, 30-80 parts of modified polyacrylates, 10-50 parts of nonionic surfactants, 5-30 parts of thickeners, 700-850 parts of environmentally friendly solvents and 5-20 parts of surface modifiers.

[0008] Preferably, the dispersant is prepared from the following materials:

[0009] 100 parts of polyether modified polyol compounds, 55 parts of modified polyacrylates, 30 parts of nonionic surfactants, 26 parts of thickeners, 770 parts of environmentally friendly solvents and 12 parts of surface modifiers.

[0010] A method for preparing a dispersant for water-based nano pigment paste, the preparation steps are:

[0011] S1: Prepare materials, including 100 parts of polyether-modified polyol compounds, 55 parts of modified polyacrylates, 30 parts of nonionic surfactants, 26 parts of thickeners, 770 parts of environmentally friendly solvents, and 12 parts of surface modifiers;

[0012] S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved;

[0013] S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed;

[0014] S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes;

[0015] S5: Add a natural plant-derived thickener to the solution, and raise the temperature to 60-70°C while continuously stirring to ensure that the thickener is completely dissolved and fully mixed with other ingredients;

[0016] S6: Add the environmentally friendly solvent to the above mixture and continue stirring until the solution is uniform and there are no obvious bubbles;

[0017] S7: Add the surface modifier to the solution, continue stirring until completely mixed, cool the reaction mixture naturally to room temperature, remove impurities and undissolved particles by filtering, and obtain a uniform and transparent water-based nano-pigment color paste dispersant.

[0018] Preferably, the S2 specifically includes:

[0019] Prepare a stirring container, accurately weigh 100 parts of the polyether-modified polyol compound, and pour it into the stirring container;

[0020] Place the stirring container in a heating source and gradually heat the solution to 50-60°C. During the heating process, use a magnetic stirrer to continuously stir at a speed of 100-300 rpm;

[0021] By observing the state of the solution in the stirring container, determine whether it has been completely dissolved. If the solution is uneven and precipitated, adjust the heating and stirring conditions.

[0022] Preferably, the S3 specifically includes:

[0023] Add the prepared modified polyacrylate to the polyether-modified polyol solution, and during the addition, the flow meter can be adjusted to ensure that the modified polyacrylate is added at a slow and uniform rate;

[0024] After the modified polyacrylate is added to the solution, stirring is continued, and the stirring speed is set to 200-400 rpm. At the same time, the temperature is gradually raised to a temperature range of 70-80°C, and the temperature is slowly raised by a constant temperature heating system;

[0025] When the temperature reaches 70-80°C, continue stirring, observe the solubility of the modified polyacrylate, and use a dispersion instrument to test it.

[0026] Preferably, the S4 specifically includes:

[0027] Prepare nonionic surfactants, including polyoxyethylene and alkylphenol polyoxyethylene ether, with the added amount of surfactant accounting for 1% to 5% of the total formula weight;

[0028] Add nonionic surfactant to the dissolved and evenly dispersed solution, add slowly using a syringe, and ensure that the surfactant is in full contact with the solution;

[0029] After adding the surfactant, continue stirring the solution for 30 minutes, and control the stirring speed at 200-600 rpm;

[0030] During the stirring process, observe the state of the solution regularly to ensure that the surfactant has been completely dissolved and well mixed with other components in the solution. Take samples to test the transparency, viscosity and dispersion of the solution to confirm whether the expected effect has been achieved.

[0031] After 30 minutes of stirring, the solution was tested for surfactant dispersion.

[0032] Preferably, the method of confirming whether the expected effect has been achieved by sampling and testing the transparency, viscosity and dispersion of the solution specifically includes:

[0033] A small sample was taken from the solution using a syringe and the clarity was observed by colorimetry;

[0034] Use a rotational viscometer to measure the viscosity of the sample and determine the fluidity and consistency of the solution;

[0035] A particle size analyzer is used to measure the particle size and distribution in the sample. The particle distribution calculation formula is:

[0036]

[0037] Where D i is the diameter of the particle, N i The diameter is D i The number of particles, D a is the average particle diameter.

[0038] Preferably, the S5 specifically includes:

[0039] A natural plant-derived thickener, which is one of xanthan gum, guar gum and sodium alginate, is added to the solution;

[0040] When adding the thickener, stir and start heating the solution to ensure that the temperature rises to the range of 60-70°C. Introduce an intelligent temperature control system to monitor and adjust the solution temperature in real time to ensure that the temperature is accurately controlled between 60-70°C.

[0041] Continue to maintain the stirring speed to ensure that the thickener is completely dissolved and evenly dispersed. The stirring time is 15 to 30 minutes;

[0042] Confirm the dissolution state, check the transparency, take samples to test the viscosity, and confirm whether the thickening effect meets expectations;

[0043] After the thickener is completely dissolved, gradually cool the solution to room temperature while keeping stirring.

[0044] Preferably, the S6 specifically includes:

[0045] Add the environmentally friendly solvent to the already uniform thickener solution in batches, and keep stirring evenly when adding the solvent;

[0046] Keep stirring continuously to ensure that the solvent and thickener solution are completely mixed and the solution reaches a uniform state. The stirring time is 10 to 20 minutes;

[0047] If bubbles appear in the solution, reduce the stirring speed to reduce the formation of bubbles and perform a slight degassing treatment under vacuum;

[0048] Take samples to test the viscosity and transparency of the solution, cool the solution naturally, and continue to stir gently during the cooling process to avoid the formation of bubbles.

[0049] Preferably, the S7 specifically includes:

[0050] Add the surface modifier to the solution and continue stirring to ensure that the surface modifier is fully mixed with the nano pigment and the solution to form a stable dispersion system. The stirring time is 15 to 30 minutes.

[0051] During the stirring process, observe the solution regularly to ensure that the surface modifier is completely combined with the pigment particles, the color is uniform, and there is no obvious agglomeration and stratification. If the pigment still agglomerates during the mixing process, add dispersant;

[0052] The reaction mixture was removed from the stirring environment and allowed to cool naturally at room temperature;

[0053] After the mixture is naturally cooled to room temperature, it is filtered through a filter cloth to remove incompletely dissolved particles, impurities and oversized particles to obtain a uniform and transparent water-based nano-pigment paste;

[0054] Observe the transparency and uniformity, use small samples to test the dispersion of pigments, and observe whether the solution has precipitation, stratification, and particle aggregation;

[0055] Store the final water-based nanopigment paste in a sealed container.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] The dispersant of the present invention can not only effectively disperse the pigment particles and prevent the agglomeration of the pigment, but also maintain the good fluidity and appropriate viscosity of the pigment, thereby ensuring the high stability of the color paste. In addition, the environmentally friendly solvent and natural thickener used in the present invention can reduce the pollution to the environment, which is in line with the development trend of modern green chemical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a step flow framework diagram of the present invention. DETAILED DESCRIPTION

[0059] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0060] Embodiment 1

[0061] A method for preparing a dispersant for water-based nano pigment paste, the preparation steps are:

[0062] S1: Prepare materials, including 100 parts of polyether-modified polyol compounds, 55 parts of modified polyacrylates, 30 parts of nonionic surfactants, 26 parts of thickeners, 770 parts of environmentally friendly solvents, and 12 parts of surface modifiers;

[0063] S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved;

[0064] S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed;

[0065] S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes;

[0066] S5: Add a natural plant-derived thickener to the solution, and raise the temperature to 60-70°C while continuously stirring to ensure that the thickener is completely dissolved and fully mixed with other ingredients;

[0067] S6: Add the environmentally friendly solvent to the above mixture and continue stirring until the solution is uniform and there are no obvious bubbles;

[0068] S7: Add the surface modifier to the solution, continue stirring until completely mixed, cool the reaction mixture naturally to room temperature, remove impurities and undissolved particles by filtering, and obtain a uniform and transparent water-based nano-pigment color paste dispersant.

[0069] Embodiment 2

[0070] A method for preparing a dispersant for water-based nano pigment paste, the preparation steps are:

[0071] S1: Prepare materials, including 80 parts of polyether-modified polyol compounds, 40 parts of modified polyacrylates, 20 parts of nonionic surfactants, 5 parts of thickeners, 600 parts of environmentally friendly solvents, and 1 part of surface modifiers;

[0072] S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved;

[0073] S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed;

[0074] S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes;

[0075] S5: Add a natural plant-derived thickener to the solution, and raise the temperature to 60-70°C while continuously stirring to ensure that the thickener is completely dissolved and fully mixed with other ingredients;

[0076] S6: Add the environmentally friendly solvent to the above mixture and continue stirring until the solution is uniform and there are no obvious bubbles;

[0077] S7: Add the surface modifier to the solution, continue stirring until completely mixed, cool the reaction mixture naturally to room temperature, remove impurities and undissolved particles by filtering, and obtain a uniform and transparent water-based nano-pigment color paste dispersant.

[0078] Embodiment 3

[0079] A method for preparing a dispersant for water-based nano pigment paste, the preparation steps are:

[0080] S1: Prepare materials, including 110 parts of polyether-modified polyol compounds, 60 parts of modified polyacrylates, 40 parts of nonionic surfactants, and 30 parts of thickeners;

[0081] S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved;

[0082] S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed;

[0083] S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes;

[0084] S5: Add a natural plant-derived thickener to the solution, and raise the temperature to 60-70°C while continuously stirring to ensure that the thickener is completely dissolved and fully mixed with other ingredients to obtain a uniform and transparent water-based nano-pigment paste dispersant.

[0085] Embodiment 4

[0086] A method for preparing a dispersant for water-based nano pigment paste, the preparation steps are:

[0087] S1: Prepare materials, including 150 parts of polyether-modified polyol compounds, 80 parts of modified polyacrylates, 40 parts of nonionic surfactants, 30 parts of thickeners, and 600 parts of environmentally friendly solvents;

[0088] S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved;

[0089] S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed;

[0090] S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes;

[0091] S5: Add a natural plant-derived thickener to the solution, and raise the temperature to 60-70°C while continuously stirring to ensure that the thickener is completely dissolved and fully mixed with other ingredients;

[0092] S6: Add the environmentally friendly solvent to the above mixture and continue stirring until the solution is uniform and has no obvious bubbles. Remove impurities and undissolved particles through filtration to obtain a uniform and transparent water-based nano-pigment color paste dispersant.

[0093] Embodiment 5

[0094] A method for preparing a dispersant for water-based nano pigment paste, the preparation steps are:

[0095] S1: Prepare materials, including 200 parts of polyether-modified polyol compounds, 100 parts of modified polyacrylates, 50 parts of nonionic surfactants, 60 parts of environmentally friendly solvents, and 15 parts of surface modifiers;

[0096] S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved;

[0097] S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed;

[0098] S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes;

[0099] S5: Add the environmentally friendly solvent to the above mixture and continue stirring until the solution is uniform and there are no obvious bubbles;

[0100] S6: Add the surface modifier to the solution, continue stirring until completely mixed, cool the reaction mixture naturally to room temperature, remove impurities and undissolved particles by filtering, and obtain a uniform and transparent water-based nano-pigment color paste dispersant.

[0101] The following table shows the properties of the loose powder prepared in different embodiments.

[0102] Group Dispersibility stability Example 1 good good Example 2 middle good Example 3 middle middle Example 4 Low Low Example 5 good Low Comparative Example 1 Low middle

[0103] In summary, the advantages of the present invention are:

[0104] The polyether-modified polyol compound and modified polyacrylate used in the present invention can interact well with the nano-pigment particles in the aqueous solvent, significantly improving the dispersibility of the pigment. The structural design of the dispersant can effectively reduce the aggregation between the pigment particles and maintain the stable dispersion state of the pigment.

[0105] By introducing a surface modifier and a nonionic surfactant into the dispersant, the dispersant provided by the present invention has good dispersing and stabilizing effects, can prevent the reaggregation of pigment particles, prolong the storage period of the pigment paste, and improve the long-term stability of the paste;

[0106] The use of thickeners can adjust the rheological properties of the color paste, so that it has good application performance. By selecting thickeners from natural plant sources, such as xanthan gum, guar gum, etc., the present invention can maintain uniform distribution of the dispersant in the aqueous system, ensuring the coating and stability;

[0107] The environmentally friendly solvent and natural thickener used in the present invention are not only environmentally friendly, but also have low toxicity, which meets the requirements of current green chemistry and sustainable development. Compared with traditional solvents, the environmentally friendly solvents are less harmful to the human body and the environment, and reduce the emission of volatile organic compounds.

[0108] Due to the excellent performance of the dispersant, the water-based nano-pigment paste prepared with the dispersant has higher transparency, a more uniform surface after coating, no obvious particle precipitation or stratification, and can provide a higher visual effect for the end product;

[0109] The dispersant preparation method of the present invention has simple steps and is easy to operate, and the equipment and raw materials used are widely available, and has good industrial production potential. By accurately controlling parameters such as the addition amount of each component and the stirring temperature, the quality stability of the final dispersant can be effectively ensured.

[0110] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A dispersant for water-based nano pigment paste, characterized in that: The dispersant is prepared from the following materials: 50-150 parts of polyether modified polyol compounds, 30-80 parts of modified polyacrylates, 10-50 parts of nonionic surfactants, 5-30 parts of thickeners, 700-850 parts of environmentally friendly solvents and 5-20 parts of surface modifiers.

2. The dispersant for aqueous nano pigment paste according to claim 1, characterized in that: The dispersant is prepared from the following materials: 100 parts of polyether modified polyol compounds, 55 parts of modified polyacrylates, 30 parts of nonionic surfactants, 26 parts of thickeners, 770 parts of environmentally friendly solvents and 12 parts of surface modifiers.

3. A method for preparing a dispersant for water-based nano pigment paste, characterized in that: The preparation steps are: S1: Prepare materials, including 100 parts of polyether-modified polyol compounds, 55 parts of modified polyacrylates, 30 parts of nonionic surfactants, 26 parts of thickeners, 770 parts of environmentally friendly solvents, and 12 parts of surface modifiers; S2: Add the polyether-modified polyol compound into a stirring container, preheat it to 50-60°C, and continue stirring until it is completely dissolved; S3: slowly add modified polyacrylate to the polyether modified polyol compound solution, continue stirring and raise the temperature to 70-80°C until the modified polyacrylate is completely dissolved and evenly dispersed; S4: Add a nonionic surfactant to the solution and continue stirring for 30 minutes; S5: Add a natural plant-derived thickener to the solution, and raise the temperature to 60-70°C while continuously stirring to ensure that the thickener is completely dissolved and fully mixed with other ingredients; S6: Add the environmentally friendly solvent to the above mixture and continue stirring until the solution is uniform and there are no obvious bubbles; S7: Add the surface modifier to the solution, continue stirring until completely mixed, cool the reaction mixture naturally to room temperature, remove impurities and undissolved particles by filtering, and obtain a uniform and transparent water-based nano-pigment color paste dispersant.

4. The method for preparing a dispersant for water-based nano pigment paste according to claim 3, characterized in that: The S2 specifically includes: Prepare a stirring container, accurately weigh 100 parts of the polyether-modified polyol compound, and pour it into the stirring container; Place the stirring container in a heating source and gradually heat the solution to 50-60°C. During the heating process, use a magnetic stirrer to continuously stir at a speed of 100-300 rpm; By observing the state of the solution in the stirring container, determine whether it has been completely dissolved. If the solution is uneven and precipitated, adjust the heating and stirring conditions.

5. The method for preparing a dispersant for water-based nano pigment paste according to claim 4, characterized in that: The S3 specifically includes: Add the prepared modified polyacrylate to the polyether-modified polyol solution, and during the addition, the flow meter can be adjusted to ensure that the modified polyacrylate is added at a slow and uniform rate; After the modified polyacrylate is added to the solution, stirring is continued, and the stirring speed is set to 200-400 rpm. At the same time, the temperature is gradually raised to a temperature range of 70-80°C, and the temperature is slowly raised by a constant temperature heating system; When the temperature reaches 70-80°C, continue stirring, observe the solubility of the modified polyacrylate, and use a dispersion instrument to test it.

6. The method for preparing a dispersant for water-based nano pigment paste according to claim 5, characterized in that: The S4 specifically includes: Prepare nonionic surfactants, including polyoxyethylene and alkylphenol polyoxyethylene ether, with the added amount of surfactant accounting for 1% to 5% of the total formula weight; Add nonionic surfactant to the dissolved and evenly dispersed solution, add slowly using a syringe, and ensure that the surfactant is in full contact with the solution; After adding the surfactant, continue stirring the solution for 30 minutes, with the stirring speed controlled at 200-600 rpm; During the stirring process, observe the state of the solution regularly to ensure that the surfactant has been completely dissolved and well mixed with other components in the solution. Take samples to test the transparency, viscosity and dispersion of the solution to confirm whether the expected effect has been achieved. After 30 minutes of stirring, the solution was tested for surfactant dispersion.

7. The method for preparing a dispersant for water-based nano pigment paste according to claim 6, characterized in that: The method of checking the transparency, viscosity and dispersion of the solution by sampling to confirm whether the expected effect has been achieved specifically includes: A small sample was taken from the solution using a syringe and the clarity was observed by colorimetry; Use a rotational viscometer to measure the viscosity of the sample and determine the fluidity and consistency of the solution; A particle size analyzer is used to measure the particle size and distribution in the sample. The particle distribution calculation formula is: Where D i is the diameter of the particle, N i The diameter is D i The number of particles, D a is the average particle diameter.

8. The method for preparing a dispersant for water-based nano pigment paste according to claim 7, characterized in that: The S5 specifically includes: A natural plant-derived thickener, which is one of xanthan gum, guar gum and sodium alginate, is added to the solution; When adding the thickener, stir and start heating the solution to ensure that the temperature rises to the range of 60-70°C. Introduce an intelligent temperature control system to monitor and adjust the solution temperature in real time to ensure that the temperature is accurately controlled between 60-70°C. Continue to maintain the stirring speed to ensure that the thickener is completely dissolved and evenly dispersed. The stirring time is 15 to 30 minutes; Confirm the dissolution state, check the transparency, take samples to test the viscosity, and confirm whether the thickening effect meets expectations; After the thickener is completely dissolved, gradually cool the solution to room temperature while keeping stirring.

9. The method for preparing a dispersant for water-based nano pigment paste according to claim 8, characterized in that: The S6 specifically includes: Add the environmentally friendly solvent to the already uniform thickener solution in batches, and keep stirring evenly when adding the solvent; Keep stirring continuously to ensure that the solvent and thickener solution are completely mixed and the solution reaches a uniform state. The stirring time is 10 to 20 minutes; If bubbles appear in the solution, reduce the stirring speed to reduce the formation of bubbles and perform a slight degassing treatment under vacuum; Take samples to test the viscosity and transparency of the solution, cool the solution naturally, and continue to stir gently during the cooling process to avoid the formation of bubbles.

10. The method for preparing a dispersant for water-based nano pigment paste according to claim 9, characterized in that: The S7 specifically includes: Add the surface modifier to the solution and continue stirring to ensure that the surface modifier is fully mixed with the nano pigment and the solution to form a stable dispersion system. The stirring time is 15 to 30 minutes. During the stirring process, observe the solution regularly to ensure that the surface modifier is completely combined with the pigment particles, the color is uniform, and there is no obvious agglomeration and stratification. If the pigment still agglomerates during the mixing process, add dispersant; The reaction mixture was removed from the stirring environment and allowed to cool naturally at room temperature; After the mixture is naturally cooled to room temperature, it is filtered through a filter cloth to remove incompletely dissolved particles, impurities and oversized particles to obtain a uniform and transparent water-based nano-pigment paste; Observe the transparency and uniformity, use small samples to test the dispersion of pigments, and observe whether the solution has precipitation, stratification, and particle aggregation; Store the final water-based nanopigment paste in a sealed container.

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