A production process for high color strength organic pigments

Abstract

The present invention belongs to the technical field of pigment production, and particularly relates to a production process of high-color-intensity organic pigments. The specific steps include: preparing a pigment slurry, preparing a composite slurry, pigmentation treatment, pressure filtration and washing, and preparing high-color-intensity organic pigments. In the production process of the present invention, the organic pigment filter cake is slurried and combined with bismuth oxychloride, which can effectively change the polarity of the organic pigment, improve the dispersibility, form a natural barrier for the organic pigment, and improve the coloring ability of the organic pigment. At the same time, the hydrolysis reagent triethanolamine is added and acts together with bismuth oxychloride to prepare organic pigments with small particle size and stability, making the organic pigments easy to dye functional chemical fibers. In the pigmentation stage, two solvents, DMF and NMP, are used in combination, which helps to better disperse the organic pigment particles and improve the efficiency of pigmentation treatment. The production process of the high-color-intensity organic pigments of the present invention is short in time, high in efficiency and environmentally friendly, and is applicable to a variety of organic pigments.

Description

Technical Field

[0001] The present invention belongs to the technical field of pigment production, and particularly relates to a production process of high color strength organic pigments. Background Art

[0002] Pigments refer to substances that are insoluble in media such as water and oil and color the object to be colored in a highly dispersed particulate state, and can be divided into two major categories: organic pigments and inorganic pigments. Compared with inorganic pigments, organic pigments have the characteristics of a complete color spectrum, bright colors, high coloring power, low toxicity, good durability, etc., and their uses have become increasingly widespread in recent years. With the continuous development of organic pigment technology, its application fields have also been continuously expanding, and higher requirements have been put forward for organic pigments. In the dyeing of functional chemical fibers, compared with ordinary chemical fibers, the requirements are more refined and demanding. The selected organic pigments not only need to have excellent coloring power and color fastness to ensure the brightness and durability of colors, but also must avoid damaging the functional characteristics of the fibers themselves. Moreover, the organic pigments and their dyeing processes used are green and environmentally friendly, reducing the impact on the environment.

[0003] Currently, the production processes of organic pigments have the disadvantages of high unit energy consumption and large amounts of waste emissions. There is little research on the application of organic pigments in the field of dyeing functional chemical fibers. Some existing organic pigments have problems such as insufficient color strength, poor dyeing stability, and low color fastness during dyeing, resulting in the need to use a higher proportion of pigments to achieve the desired color depth. This not only increases the production cost, but also may affect the physical properties of the fibers, and the dyeing stability is poor. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention proposes a production process of high color strength organic pigments. The production process of the high color strength organic pigments of the present invention is short in time, high in efficiency and green and environmentally friendly. It can prepare organic pigments with high color strength, high coloring power, high color fastness and good stability, which are easy to dye functional chemical fibers and have strong adsorption. The organic pigments can be well adsorbed onto the chemical fibers, showing bright colors. After the organic pigment cake is slurried to form a slurry and combined with bismuth oxy chloride, it can effectively change the surface polarity of the organic pigment particles, enabling it to form a natural barrier to the organic pigments, improving the coloring ability of the organic pigments, protecting the pigments from interference such as temperature and ultraviolet rays and causing decolorization. At the same time, the hydrolysis reagent triethanolamine is added to make the organic pigment particles small and stable, improve the light fastness of the pigments, reduce fading caused by ultraviolet irradiation, and make it more evenly distributed on the fiber surface. The surfactant can form a stable adsorption layer between the pigment particles and the solvent, preventing the pigment particles from re-aggregating and improving the stability of the dispersion system. The production process of the high color strength organic pigments prepared by the present invention can be used for a variety of organic pigments, making them have better color strength, coloration, transparency and stability.

[0005] To achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a production process for high-color-intensity organic pigments, and the high-color-intensity organic pigments are prepared from the following raw materials: organic pigment filter cake, bismuth oxychloride, rosin, triethanolamine, silane coupling agent, surfactant, and a mixed solution of DMF (dimethylformamide) and NMP (N-methylpyrrolidone);

[0007] The production process for the high-color-intensity organic pigments is specifically as follows:

[0008] S1. Prepare a pigment slurry:

[0009] Put the organic pigment filter cake into a ball mill for pulverization. After pulverization, add it to water to form a slurry with a mass fraction of 10 - 30%, and add rosin. The mass ratio of rosin to the organic pigment filter cake is 1:20 - 40, and stir to form a slurry;

[0010] S2. Prepare a composite slurry:

[0011] First, add bismuth oxychloride to isopropanol, then mix it with the slurry obtained in step S1, and add the hydrolysis reagent triethanolamine. The dosage ratio of bismuth oxychloride, isopropanol, and triethanolamine is 1 - 5 g:30 mL:0.1 g. Stir at 70 °C for 30 - 60 min to prepare a pigment dispersion system. After adding a silane coupling agent and absolute ethanol at 60 °C, stir for 30 min, and then perform ultrasonic treatment for 30 min under an ultrasonic cell disruptor, and adjust the pH to 5 - 7 to obtain a composite slurry;

[0012] S3. Pigmentation treatment:

[0013] Add the mixed solution of DMF (dimethylformamide) and NMP (N-methylpyrrolidone) to the pigmentation kettle of the composite slurry, add a surfactant, and magnetically stir for 30 - 120 min. Perform pigmentation treatment at 100 - 120 °C for 2 h to obtain a mixed material;

[0014] S4. Pressure filtration and washing:

[0015] Send the mixed material to a filter press for pressure filtration. The filtrate is collected and recycled. The crude product after removing DMF and NMP is washed with water to obtain a wet filter cake;

[0016] S5. Prepare high-color-intensity organic pigments:

[0017] Send the qualified wet filter cake after washing to a belt dryer for drying. The particulate matter generated in the drying process is treated by a secondary wet packed tower for dust removal and discharged after reaching the standard. The condensate generated by wet dust removal is returned to the washing and pressure filtration process, and high-color-intensity organic pigments are obtained after drying.

[0018] Preferably, the silane coupling agent is at least one of KH-550, KH-560, and KH-570.

[0019] Preferably, the surfactant is DBS (sodium dodecylbenzenesulfonate) or SDS (sodium dodecyl sulfate).

[0020] Furthermore, in the mixed solution of DMF (dimethylformamide) and NMP (N-methylpyrrolidone), the volume ratio of DMF (dimethylformamide) to NMP (N-methylpyrrolidone) is 1:1, and the mixed solution of DMF (dimethylformamide) and NMP (N-methylpyrrolidone) accounts for 5-10% of the mass of the composite slurry, and the surfactant accounts for 1-5% of the mass of the composite slurry.

[0021] Furthermore, the specification model of the ultrasonic cell disruptor is JY92-II, the specification model of the belt dryer is CDG-1800, the specification model of the secondary wet packing tower is matched with the belt dryer, and the specification model of the filter press is 150 m 2 。

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0023] The production process of high-color-intensity organic pigments prepared by the present invention can be used for various organic pigments. The prepared organic pigments have high coloring intensity, stable color, small average particle size, high color fastness, are easy to dye functional chemical fibers and have good dyeing stability. The organic pigments themselves have low polarity, are prone to agglomeration and difficult to disperse. After combining them with bismuth oxychloride, the surface polarity of the organic pigment particles can be effectively changed, making them have better compatibility. Combining bismuth oxychloride on the surface of the organic pigment improves the dispersibility of the organic pigment, reduces particle aggregation, and increases wettability, dispersibility, specific surface area, coloring rate and transparency. Since nano-bismuth oxychloride has a large specific surface area, extremely strong activity and extremely strong adsorption properties, it can form a natural barrier for the organic pigment, improve the coloring ability of the organic pigment, and protect the pigment from decolorization caused by interference such as temperature and ultraviolet rays. Therefore, when the organic pigment modified with nano-bismuth oxychloride is applied to the dyeing of chemical fibers, due to the strong adsorption of bismuth oxychloride, the organic pigment can more easily penetrate into the internal structure of the fiber, thereby achieving a more uniform and deep dyeing effect, and endowing the fiber with additional enhanced effects such as antibacterial, anti-ultraviolet and anti-aging. Combining the organic pigment with bismuth oxychloride and adding the hydrolysis reagent triethanolamine at the same time makes the organic pigment have small and stable particle size, improves the light fastness of the pigment, reduces fading caused by ultraviolet irradiation, and makes it more evenly distributed on the fiber surface, thereby improving the dyeing uniformity and color. Adding a silane coupling agent at the same time can connect bismuth oxychloride and the organic pigment, prevent particle agglomeration, greatly improve the utilization rate of the organic pigment, make the particle size distribution uniform, enhance the color intensity of the pigment through the optical interference effect, and make the color of the dyed fiber more vivid. The interaction between the inorganic nanoparticles and the fiber enhances the adhesion of the pigment, thereby improving the rubbing fastness and making the dyed fiber more durable. In the pigmentation treatment stage, two solvents, DMF and NMP, are used in combination. The combined use of the two solvents helps to better disperse the organic pigment particles, improve the efficiency of the pigmentation treatment, further improve the color intensity and transparency of the organic pigment, and moreover, due to the synergistic effect of the mixture of these two solvents, together with the surfactant, only a small amount of the DMF and NMP mixture needs to be added to achieve the same effect, reducing the cost. The surfactant can reduce the surface tension of the pigment particles, making it easier for DMF and NMP to penetrate into the pigment agglomerates, thereby more effectively dispersing the pigment particles. The surfactant can form a stable adsorption layer between the pigment particles and the solvent, prevent the pigment particles from re-aggregating, and improve the stability of the dispersion system. Good dispersibility helps to improve the coloring power of the pigment, making the color of the pigment more uniform and vivid in the final product. The production process of high-color-intensity organic pigments prepared by the present invention can be used for various organic pigments, making them have better color intensity, coloring degree, transparency and stability. The high-color-intensity organic pigments prepared by the present invention have the characteristics of high coloring degree, good stability and environmental friendliness when used for dyeing functional chemical fibers. Description of the Drawings

[0024] Figure 1 This is the process flow chart for the production of high color strength organic pigments of the present invention;

[0025] Figure 2 This is the average particle size diagram of the high color strength organic pigments prepared by the present invention;

[0026] Figure 3 This is the color fastness to dry and wet rubbing of the high color strength organic pigments prepared by the present invention. Detailed implementation manners

[0027] To enable those skilled in the art to better understand the technical solution of the present invention and make the above features, objectives, and advantages of the present invention clearer and easier to understand, the present invention will be further described below in conjunction with embodiments. The embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0028] According to Figure 1 A process flow chart of a production process of high color strength organic pigments as shown, the specific embodiments of the present invention are as follows:

[0029] Example 1: This example provides a production process of high color strength organic pigments, and the specific steps are as follows:

[0030] S1, Prepare the pigment slurry:

[0031] Put the organic pigment filter cake into a ball mill for crushing. After crushing, add it to water to form a slurry with a mass fraction of 10%, and add rosin. The mass ratio of rosin to the organic pigment filter cake is 1:20, and stir to form a slurry;

[0032] S2, Prepare the composite slurry:

[0033] First, add bismuth oxychloride to isopropyl alcohol, then mix it with the slurry obtained in step S1, and add the hydrolysis reagent triethanolamine to it. The dosage ratio of bismuth oxychloride, isopropyl alcohol, and triethanolamine is 1 g:30 mL:0.1 g. Stir at 70 °C for 30 min to prepare a pigment dispersion system. After the pigment dispersion system is cooled to 60 °C, add silane coupling agent KH-550 and absolute ethanol. The volume ratio of silane coupling agent KH-550 to absolute ethanol is 1:15, and the addition amount of silane coupling agent KH-550 and absolute ethanol is 5% of the mass of the pigment dispersion system. After stirring at 200 rpm for 30 min, ultrasonically treat it under an ultrasonic cell disruptor for 30 min. Set the power of the ultrasonic cell disruptor to 99%, with continuous 5 s and intermittent 5 s, and adjust the pH to 5 with citric acid to obtain the composite slurry;

[0034] S3, Pigmentation treatment:

[0035] Add the DMF and NMP mixture to the pigmentation kettle containing the composite slurry. The DMF and NMP mixture is 5% of the mass of the composite slurry. Add the surfactant DBS (sodium dodecylbenzenesulfonate), and the surfactant DBS (sodium dodecylbenzenesulfonate) is 1% of the mass of the composite slurry. Stir magnetically at 500 rpm for 30 min, and conduct pigmentation treatment at 100 °C for 2 h to obtain a mixed material;

[0036] S4, pressure filtration and washing:

[0037] Feed the mixed material into a filter press for pressure filtration. The filtrate is collected and recycled. The crude product from which DMF and NMP are removed is washed with water to obtain a wet filter cake;

[0038] S5, preparation of high color strength organic pigment:

[0039] Send the washed qualified wet filter cake to a belt dryer for drying. The particulate matter generated in the drying process is treated by a secondary wet packed tower for dust removal and then discharged up to standard. The condensate generated by wet dust removal is returned to the pressure filtration and washing process. After drying, a high color strength organic pigment is obtained.

[0040] Example 2: This example provides a production process of high color strength organic pigment, and the specific steps are as follows:

[0041] S1, preparation of pigment slurry:

[0042] Put the organic pigment filter cake into a ball mill for crushing. After crushing, add it to water to form a slurry with a mass fraction of 20%, and add rosin. The mass ratio of rosin to the organic pigment filter cake is 1:30, and stir to form a slurry;

[0043] S2, preparation of composite slurry:

[0044] First, add bismuth oxychloride to isopropanol, then mix it with the slurry obtained in step S1, and add the hydrolysis reagent triethanolamine. The dosage ratio of bismuth oxychloride, isopropanol and triethanolamine is 3 g:30 mL:0.1 g. Stir at 70 °C for 40 min to prepare a pigment dispersion system. After the pigment dispersion system is cooled to 60 °C, add the silane coupling agent KH-560 and absolute ethanol. The volume ratio of the silane coupling agent KH-560 to absolute ethanol is 1:15, and the addition amount of the silane coupling agent KH-560 and absolute ethanol is 8% of the mass of the pigment dispersion system. After stirring and treating at 200 rpm for 30 min, conduct ultrasonic treatment under an ultrasonic cell disruptor for 30 min. Set the power of the ultrasonic cell disruptor to 99%, with continuous 5 s and intermittent 5 s, and adjust the pH to 6 with citric acid to obtain a composite slurry;

[0045] S3, pigmentation treatment:

[0046] Add the DMF and NMP mixture to the pigmentation kettle containing the composite slurry. The DMF and NMP mixture is 8% of the mass of the composite slurry. Add the surfactant DBS (sodium dodecylbenzenesulfonate), and the surfactant DBS (sodium dodecylbenzenesulfonate) is 3% of the mass of the composite slurry. Stir magnetically at 500 rpm for 60 min, and perform pigmentation treatment at 110 °C for 2 h to obtain a mixed material;

[0047] S4, pressure filtration and washing:

[0048] Feed the mixed material into a filter press for pressure filtration. The filtrate is collected and recycled. The crude product from which DMF and NMP are removed is washed with water to obtain a wet filter cake;

[0049] S5, prepare high-color-intensity organic pigment:

[0050] Send the washed qualified wet filter cake to a belt dryer for drying. The particulate matter generated in the drying process is treated by a secondary wet packed tower for dust removal and then discharged up to standard. The condensate generated by wet dust removal is returned to the pressure filtration and washing process. After drying, a high-color-intensity organic pigment is obtained.

[0051] Example 3: This example provides a production process of high-color-intensity organic pigment, and the specific steps are as follows:

[0052] S1, prepare pigment slurry:

[0053] Put the organic pigment filter cake into a ball mill for crushing. After crushing, add it to water to form a slurry with a mass fraction of 30%, and add rosin. The mass ratio of rosin to the organic pigment filter cake is 1:40, and stir to form a slurry;

[0054] S2, prepare composite slurry:

[0055] First, add bismuth oxychloride to isopropyl alcohol, then mix it with the slurry obtained in step S1, and add the hydrolysis reagent triethanolamine. The dosage ratio of bismuth oxychloride, isopropyl alcohol and triethanolamine is 5 g:30 mL:0.1 g. Stir at 70 °C for 60 min to prepare a pigment dispersion system. After the pigment dispersion system is cooled to 60 °C, add the silane coupling agent KH-570 and anhydrous ethanol. The volume ratio of the silane coupling agent KH-570 and anhydrous ethanol is 1:15, and the addition amount of the silane coupling agent KH-570 and anhydrous ethanol is 10% of the mass of the pigment dispersion system. After stirring at 200 rpm for 30 min, perform ultrasonic treatment under an ultrasonic cell disruptor for 30 min. Set the power of the ultrasonic cell disruptor to 99%, with continuous 5 s and intermittent 5 s, and adjust the pH to 7 with citric acid to obtain a composite slurry;

[0056] S3, pigmentation treatment:

[0057] Add the DMF and NMP mixture to the pigmentation kettle containing the composite slurry. The DMF and NMP mixture is 10% of the mass of the composite slurry. Add surfactant SDS (sodium dodecyl sulfate), and surfactant SDS (sodium dodecyl sulfate) is 5% of the mass of the composite slurry. Stir magnetically at 500 rpm for 120 min, and perform pigmentation treatment at 120 °C for 2 h to obtain a mixed material;

[0058] S4, pressure filtration and washing:

[0059] Feed the mixed material into a filter press for pressure filtration. The filtrate is collected and recycled. The crude product from which DMF and NMP are removed is washed with water to obtain a wet filter cake;

[0060] S5, preparation of high color strength organic pigment:

[0061] Send the washed qualified wet filter cake to a belt dryer for drying. The particulate matter generated in the drying process is discharged up to standard after being treated by a secondary wet packing tower for dust removal. The condensate generated by the wet dust removal is returned to the pressure filtration and washing process. After drying, a high color strength organic pigment is obtained.

[0062] The difference between Comparative Example 1 and Example 1 is that triethanolamine was not added in step S1, and the rest is the same as Example 1.

[0063] The difference between Comparative Example 2 and Example 1 is that step S2 was cancelled, and the rest is the same as Example 1.

[0064] Experimental Example 1: According to the national standard GB 5211.19-88 "Determination of relative tinting strength and reduced color of colored pigments - Visual comparison method", the tinting strength of the high-color-intensity organic pigments prepared in Examples 1-3 and Comparative Examples 1-2 was tested. The organic pigments were mixed with the paint base at a mass ratio of 2:1. The paint base and the above pigments were weighed and ground on a grinder with a force of 1 kN. Each pass was 50 revolutions, and a total of 200 revolutions were ground. About 1 / 4 of the total volume of the slurry was taken out and stored in a suitable container, and then grinding was continued to 300 revolutions and 400 revolutions, and the same small part of the slurry was taken out as above. It was also stored in a suitable container and left for use. Weigh 3.0 g of white slurry, and grind it with the amount of the standard pigment dispersion of the selected dilution ratio under the minimum force. Each pass of grinding was 25 revolutions, and a total of 4 passes were ground. The collected reduced color slurry was left for use. The reduced color slurry of the sample was prepared in the same way. The prepared reduced color slurries were arranged on a colorless glass plate, and a wet film applicator was used to pull them down to form two opaque strips with a width of 25 mm and a contact side length of 40 mm and a uniform thickness. Gently wipe each color strip with a finger, and compare the difference in the color depth of the wiped and unwiped surfaces. If there is an obvious difference in the results, it is recorded. Continue to test the unwiped surface, and immediately compare the coloring intensity and hue of the two through the glass plate under scattered light or artificial daylight. If the color intensities are equal and the hues are the same, the reduced color is the same, and the relative tinting strength of the tested sample is 100%. The relative tinting strength of the test sample is calculated by the following formula: (b / a)×100% of the standard sample, where a is the mass of the sample that reaches the same coloring intensity as the standard, g; b is the mass of the standard sample, g.

[0065] Experimental Example 2: Using the high-color-intensity organic pigments prepared in Examples 1-3 and Comparative Examples 1-2 as samples, the utilization rate of the organic pigments was tested. The absorbance of the aqueous solution of the reaction bath before and after the experiment of the sample pigments was measured with a spectrophotometer, and the concentration of the organic pigments in the solution before and after the reaction was obtained according to the Lambert-Beer equation. The calculation formula for the utilization rate (%) of the organic pigments is as follows: Q1=(C1−C2) / C1 where Q1 is the utilization rate of the organic pigments, %; C1 is the concentration of the organic pigments in the solution before the reaction, mg / L; C2 is the concentration of the organic pigments in the solution after the reaction, mg / L.

[0066] Experimental Example 3: The fixation rate of the high color strength organic pigments prepared in Examples 1-3 and Comparative Examples 1-2 was tested. 1.000 g of the sample pigment was weighed with an electronic analytical balance and placed in a beaker. 50 mL of deionized water was added. The mouth of the beaker was sealed with plastic wrap and placed in a constant temperature biological shaker at 25 °C for 7 days. After filtration, the absorbance of the filtrate was measured with a spectrophotometer. According to the standard absorbance curve, the concentration of the filtrate was obtained, and then the amount of the organic pigment immersed in water was calculated. The formula for calculating the fixation rate (%) of the sample pigment in water is as follows: Q2=(m1 - m2) / m1, where Q2 is the fixation rate of the composite pigment, %; m1 is the amount of the organic pigment contained in the sample pigment, g; m2 is the amount of the organic pigment immersed in water, g.

[0067] Table 1

[0068]

[0069] As can be seen from the results in Table 1, the coloring power of Examples 1-3 is higher than that of the control group, indicating that the organic pigments prepared by the production process of the high color strength organic pigments of the present invention have good coloring power. The utilization rate of the organic pigments also reaches more than 90%, avoiding the waste of organic pigments, reducing the cost, and the fixation rate reaches 96.9%, indicating that it can be well adsorbed on the functional chemical fiber and has a good fixation rate.

[0070] Figure 2 It shows that the organic pigments prepared by the production process of the high color strength organic pigments of the present invention have a smaller particle size, indicating that through the production process of the present invention, organic pigments with small particle sizes are successfully prepared. These organic pigments with small particle sizes have various advantages, especially showing excellent performance in the dyeing process of functional chemical fibers. Specifically, due to their small particle sizes, the organic pigments with small particle sizes can more easily penetrate into the internal structure of the fiber, thus achieving a more uniform and in-depth dyeing effect. Such organic pigments with small particle sizes not only improve the dyeing uniformity and coloring rate, but also enhance the stability of the dyed fiber products. It shows that during use, the organic pigments are not easily detached from the fiber, thus ensuring the long-term color fastness and durability of the dyed fiber. In addition, the high specific surface area of the small particle pigments also helps to improve their adhesion on the fiber surface, further enhancing the durability of the dyeing. Figure 3 The results show that the organic pigments prepared by the production process of the present invention exhibit excellent performance in terms of color fastness to dry and wet rubbing. The color fastness to dry and wet rubbing of these organic pigments reaches above level 4, which is a relatively high level in international standards. This means that under normal use and washing conditions, the color of the dyed fiber will not easily fall off or fade due to rubbing, thus ensuring the appearance quality and service life of the dyed product.

[0071] In summary, the organic pigment prepared by the present invention not only has good color fastness but also excellent abrasion resistance, which gives it significant advantages in the dyeing application of functional chemical fibers. Whether in the production process or in the performance of the final product, the high color strength organic pigment production process of the present invention demonstrates its unique application value and market potential.

[0072] The present invention and its embodiments have been described above. Such description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual application is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the spirit of the present invention, design similar methods and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A production process of high color strength organic pigments, characterized in that, The high color intensity organic pigment is prepared from the following raw materials: organic pigment filter cake, bismuth oxychloride, rosin, triethanolamine, silane coupling agent, surfactant, and a mixed solution of DMF and NMP; The production process of the high color intensity organic pigment is as follows: S1. Prepare the pigment slurry: Crush the organic pigment filter cake, add it to water after crushing to form a slurry, and add rosin, then stir to form the pigment slurry; S2. Prepare the composite slurry: First, add bismuth oxychloride to isopropanol, then mix it with the pigment slurry obtained in step S1 to form a mixture. Add the hydrolysis reagent triethanolamine to the mixture to prepare a pigment dispersion system. Add the silane coupling agent and absolute ethanol, stir, and then perform ultrasonic treatment. Adjust the pH to obtain the composite slurry; S3. Pigmentation treatment: Add the mixed solution of DMF and NMP to the pigmentation kettle containing the composite slurry, add the surfactant, and perform magnetic stirring for pigmentation treatment to obtain the mixed material; S4. Pressure filtration and washing: Perform pressure filtration on the mixed material, collect and reuse the filtrate, and obtain the wet filter cake after washing with water; S5. Prepare the high color intensity organic pigment: Dry the washed qualified wet filter cake to obtain the high color intensity organic pigment.

2. The production process of a high color strength organic pigment according to claim 1, characterized in that, In step S1, the mass fraction of the slurry is 10 - 30%, and the mass ratio of rosin to the organic pigment filter cake is 1:20 - 40.

3. The production process of a high color intensity organic pigment according to claim 1, characterized in that, The silane coupling agent is at least one of KH - 550, KH - 560, and KH - 570, and the surfactant is DBS or SDS.

4. The production process of a high color strength organic pigment according to claim 1, characterized in that, In step S2, the dosage ratio of bismuth oxychloride, isopropanol, and triethanolamine is 1 - 5 g:30 mL:0.1 g. In step S2, the ultrasonic treatment is to use an ultrasonic cell disruptor to treat for 30 min.

5. The production process of a high color strength organic pigment according to claim 1, characterized in that, In step S2, the volume ratio of the silane coupling agent to absolute ethanol is 1:15, and the addition amount of the silane coupling agent and absolute ethanol is 5 - 10% of the mass of the pigment dispersion system. The adjustment of pH is to add citric acid to adjust the pH value to 5 - 7.

6. The production process of a high color strength organic pigment according to claim 1, characterized in that, In step S3, the volume ratio of DMF to NMP in the mixed solution of DMF and NMP is 1:1, the temperature of the pigmentation treatment is 100 - 120 °C, and the time is 2 h.

7. The production process of a high color strength organic pigment according to claim 1, characterized in that, In step S3, the mixed solution of DMF and NMP is 5 - 10% of the mass of the composite slurry, and the surfactant is 1 - 5% of the mass of the composite slurry.

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