A method for producing a high-pigment water-based furnace carbon black

Abstract

The present application relates to the technical field of carbon black preparation, and more particularly to a preparation method of water-based high-color furnace carbon black. Raw materials are added into a reaction furnace in proportion for firing, and after completion, first quenching water is added; second quenching water is set before grading grinding, and the carbon black is ground through the grading mill to remove coarse particles and destroy large carbon black aggregates; third quenching water containing a surfactant is added; a high-molecular dispersant is added; and after the carbon black is collected, dry granulation is performed to obtain the water-based high-color furnace carbon black. The water-based high-color furnace carbon black dispersion treatment process provided by the present application effectively mechanically depolymerizes and surface-activates the carbon black raw materials through the introduction of a grading mill pretreatment process, significantly reduces the size and bonding strength of the carbon black aggregates, and can fully expose the active sites on the surface of the carbon black particles, thereby greatly improving the action efficiency of the carbon black active agent and the dispersant in the subsequent dispersion process, and effectively reducing the potential impact of production costs and residual additives on the system performance.

Description

Technical Field

[0001] This invention relates to the field of carbon black preparation technology, and more specifically, to a method for preparing water-based high-pigment furnace carbon black. Background Technology

[0002] In the processing of polymer materials such as coatings, inks, and plastics, high-pigment carbon black is widely used to provide excellent blackness and tinting strength due to its small primary particle size, large specific surface area, and extremely high surface energy. However, due to its unique physicochemical properties, carbon black particles exhibit extremely strong van der Waals forces, especially high-pigment carbon black, which easily forms tightly packed, difficult-to-disintegrate agglomerates. This characteristic severely restricts the uniform dispersion of carbon black in the application medium, especially in polar aqueous media systems. Due to the inherent hydrophobicity of the carbon black surface and the lack of effective affinity, the dispersion difficulty is further exacerbated. Poor dispersion not only leads to a significant decrease in the blackness of the coloring system and unexpected hue shifts, but also easily triggers subsequent flocculation and sedimentation, ultimately impairing the overall performance and storage stability of the product.

[0003] To overcome the aforementioned dispersion defects, various carbon black modification and dispersion strategies have been developed in existing technologies. Firstly, post-treatment oxidation modification of carbon black introduces polar oxygen-containing functional groups such as carboxyl, hydroxyl, and carbonyl groups onto its surface, improving its surface polarity and hydrophilicity, thereby enhancing its wetting and dispersion performance in aqueous media. Secondly, adding small-molecule surfactants as wetting and dispersing aids reduces the interfacial tension at the carbon black / water interface, improving particle wetting efficiency and initial dispersion state. Thirdly, introducing polymeric dispersants utilizes their anchoring effect on the carbon black surface and the steric hindrance effect generated by the outward-extending polymer segments to effectively prevent the re-aggregation and flocculation of dispersed particles. While these methods improve the dispersion effect of carbon black to some extent, they still suffer from problems such as large amounts of additives, poor system adaptability, and insufficient long-term stability. Therefore, developing more efficient, universal, and stable carbon black dispersion technologies remains a current research hotspot and challenge in the industry. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one aspect of the present invention is to provide a method for preparing water-based high-pigment furnace black, the specific steps of which are as follows: S1. Add the raw material oil to the reactor for combustion reaction. After completion, add quench water once to terminate the carbon black reaction and control the temperature of the carbon black flue gas. S2. A secondary quench water system is set before the classifier to control the temperature of the carbon black flue gas. The carbon black passes through the classifier to remove coarse particles and break down large carbon black aggregates. S3. Add three quenching waters containing surfactants to control the temperature of carbon black flue gas; S4. Add a polymeric dispersant; S5. Water-based high-pigment furnace black is obtained by dry granulation after carbon black collection.

[0005] Preferably, the raw material in S1 is 100% anthracene oil, the flow rate of the raw oil is 1700-1900 kg / h, and the flow rate of the potassium formate solution is 3-5 kg / h.

[0006] Preferably, the air flow rate of the reactor in S1 is 6000-7000 Nm. 3 / h, combustion temperature is 1750-1950℃, primary quench water temperature is controlled at 900-1000℃.

[0007] Preferably, the temperature of the secondary quench water in S2 is controlled at 400-500℃.

[0008] Preferably, the grading mill in S2 has a mesh size of 800-2500.

[0009] Preferably, the temperature of the three quenching water cycles in S3 is controlled at 250-270℃.

[0010] Preferably, the surfactant content in S3 is 20%-50%, and the flow rate of the three quench water stages is 1200-1800 kg / h.

[0011] Preferably, the flow rate of the polymeric dispersant in S4 is 100-200 kg / h.

[0012] Preferably, the polymeric dispersant in S4 is added via nozzle atomization.

[0013] The beneficial effects of this invention are as follows: The water-based high-pigment furnace carbon black dispersion process provided by this invention introduces a staged mill pretreatment step to effectively depolymerize and surface-activate the carbon black raw material, significantly reducing the size and bonding strength of carbon black agglomerates. This pretreatment step can fully expose the active sites on the surface of carbon black particles, thereby greatly improving the effectiveness of carbon black activators and dispersants in the subsequent dispersion process. Excellent wetting and dispersion effects can be achieved with a lower amount of additives, effectively reducing production costs and the potential impact of additive residues on system performance.

[0014] The process of this invention is simple and easy to operate, and it is easy to connect with existing carbon black production lines or downstream application processes. It has good prospects for industrial application. The water-based high-pigment furnace black product treated by this invention has a fundamentally improved dispersion performance in water-based media. Users do not need to add any additional dispersing agents. They can achieve highly uniform dispersion of carbon black by simply stirring for 10-20 minutes. This significantly simplifies the customer's usage process and reduces the application threshold and formulation complexity.

[0015] The water-based high-pigment furnace carbon black dispersion system prepared using this invention exhibits excellent blackness and stable and consistent hue. Furthermore, the dispersed particles maintain good suspension stability and are not prone to flocculation and sedimentation. This ensures the color consistency and performance reliability of the final coating, ink, or color paste products during long-term storage and use, meeting the stringent requirements for color quality in high-end application fields.

[0016] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0019] Example 1 The air flow rate for 100% anthracene oil entering the reactor is 6000-7000 Nm. 3 / h, combustion temperature is 1800-1850℃, raw material oil flow rate is 1700-1900 kg / h, potassium formate solution flow rate is 3-5 kg / h, add quench water once to terminate carbon black reaction, the temperature of quench water once is controlled at 900-1000℃. Before collecting carbon black, an air classifier mill is set up. Before the 800-2500 mesh classifier mill, a secondary quench water is set up with the temperature controlled at 400-500℃. The carbon black passes through the classifier mill to remove impurities and deagglomerate large carbon black aggregates, ensuring that the D97 particle size is more concentrated. After the classifier mill, three quench water treatments are performed. Sodium polycarboxylate dispersant is added to the quench water in a 1:1 ratio and stirred evenly. The carbon black flue gas temperature is controlled at 250-270 ℃, and the flow rate of the three quench water treatments is 1200-1800 kg / h. The micro-droplets formed by the atomization of the quench water containing surfactants through the nozzle can significantly increase the contact area between the surfactants and carbon black particles, improve the hydrophobic properties, dispersion stability and wettability of carbon black. Adding polyacrylate polymeric dispersant at a flow rate of 100-200 kg / h, the micro-droplets formed by the polymeric dispersant atomized through the nozzle can significantly increase the contact area between the polymeric dispersant and the carbon black particles, completely encapsulate the carbon black particles, improve the steric hindrance effect, and prevent the carbon black particles from re-aggregating. After collection, carbon black is dry-granulated, resulting in tiny particles that are dust-free and easy to weigh.

[0020] Example 2 The air flow rate for 100% anthracene oil entering the reactor is 6000-7000 Nm. 3 / h, combustion temperature is 1800-1850℃, raw material oil flow rate is 1700-1900 kg / h, potassium formate solution flow rate is 3-5 kg / h, add quench water once to terminate carbon black reaction, the temperature of quench water once is controlled at 900-1000℃. An air classifier mill is set up before carbon black collection. A secondary quench water is set up before the 800-2500 mesh classifier mill, and the temperature is controlled at 400-500℃. The carbon black passes through the classifier mill to remove impurities and deagglomerate large carbon black agglomerates, ensuring that the D97 particle size is more concentrated. After the classifier mill, three quench water treatments are performed. Polyurethane polymeric dispersant is added to the quench water in a 1:1 ratio and stirred evenly. The carbon black flue gas temperature is controlled at 250-270 ℃, and the flow rate of the three quench water treatments is 1200-1800 kg / h. The micro-droplets formed by the atomization of the quench water containing surfactants through the nozzle can significantly increase the contact area between the surfactants and carbon black particles, improve the hydrophobic properties, dispersion stability and wettability of carbon black. Adding polyacrylate polymeric dispersant at a flow rate of 100-200 kg / h, the micro-droplets formed by the polymeric dispersant atomized through the nozzle can significantly increase the contact area between the polymeric dispersant and the carbon black particles, completely encapsulate the carbon black particles, improve the steric hindrance effect, and prevent the carbon black particles from re-aggregating. After collection, carbon black is dry-granulated, resulting in tiny particles that are dust-free and easy to weigh.

[0021] Example 3 The air flow rate for 100% anthracene oil entering the reactor is 6000-7000 Nm. 3 / h, combustion temperature is 1800-1850℃, raw material oil flow rate is 1700-1900 kg / h, potassium formate solution flow rate is 3-5 kg / h, add quench water once to terminate carbon black reaction, the temperature of quench water once is controlled at 900-1000℃. An air classifier mill is set up before carbon black collection. A secondary quench water is set up before the 800-2500 mesh classifier mill, and the temperature is controlled at 400-500℃. The carbon black passes through the classifier mill to remove impurities and deagglomerate large carbon black agglomerates, ensuring that the D97 particle size is more concentrated. After the classifier mill, three quench water treatments are performed. 129 oily wetting and dispersing agent is added to the quench water in a 1:1 ratio and stirred evenly. The carbon black flue gas temperature is controlled at 250-270 ℃, and the flow rate of the three quench water treatments is 1200-1800 kg / h. The micro-droplets formed by the atomization of the quench water containing surfactants through the nozzle can significantly increase the contact area between the surfactants and carbon black particles, improve the hydrophobic properties, dispersion stability and wetting properties of carbon black. Adding polyacrylate polymeric dispersant at a flow rate of 100-200 kg / h, the micro-droplets formed by the polymeric dispersant atomized through the nozzle can significantly increase the contact area between the polymeric dispersant and the carbon black particles, completely encapsulate the carbon black particles, improve the steric hindrance effect, and prevent the carbon black particles from re-aggregating. After collection, carbon black is dry-granulated, resulting in tiny particles that are dust-free and easy to weigh.

[0022] The water-based high-pigment furnace black produced by the above process has an iodine absorption value of 275-295 g / kg and a DBP absorption value of 60-7010. -5 m 3 / kg, coloring strength 130-140%, nitrogen adsorption specific surface area 230-250 10 3 m 2 This water-based high-pigment furnace black has a high blackness (My value ≥ 220), good blue hue, and a hue deviation (dM value ≥ 1.5). It is readily dispersible in water; a color-stable carbon black suspension can be obtained by high-speed stirring for 10-20 minutes without grinding or the addition of activators or dispersants. After storage at 40°C for 4 weeks or at 70°C for 1 week, the color paste shows no significant changes in color, gloss, or haze. The product is in the form of small microspheres, making it convenient to use, dust-free, and suitable for inks, coatings, paints, and color pastes.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for preparing water-based high-pigment furnace black, characterized in that: The specific steps of the preparation method are as follows: S1. Add the raw material oil to the reactor for combustion reaction. After completion, add quench water once to terminate the carbon black reaction and control the temperature of the carbon black flue gas. S2. A secondary quench water system is set before the classifier to control the temperature of the carbon black flue gas. The carbon black passes through the classifier to remove coarse particles and break down large carbon black aggregates. S3. Add three quenching waters containing surfactants to control the temperature of carbon black flue gas; S4. Add a polymeric dispersant; S5. Water-based high-pigment furnace black is obtained by dry granulation after carbon black collection.

2. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The raw material in S1 is 100% anthracene oil, with a raw oil flow rate of 1700-1900 kg / h and a potassium formate solution flow rate of 3-5 kg / h.

3. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The air flow rate of the reactor in S1 is 6000-7000 Nm. 3 / h, combustion temperature is 1750-1950℃, primary quench water temperature is controlled at 900-1000℃.

4. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The temperature of the secondary quench water in S2 is controlled at 400-500℃.

5. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The grader in S2 has a mesh size of 800-2500.

6. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The temperature of the three quench water cycles in S3 is controlled at 250-270℃.

7. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The surfactant content in S3 is 20%-50%, and the flow rate of the three quench water stages is 1200-1800 kg / h.

8. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The flow rate of the polymeric dispersant in S4 is 100-200 kg / h.

9. The method for preparing water-based high-pigment furnace black according to claim 1, characterized in that: The polymeric dispersant in S4 is added via atomization through a nozzle.

10. The method for preparing water-based high-pigment furnace black according to claim 1, wherein the water-based high-pigment carbon black produced therefrom is used in inks, coatings, paints, and color pastes.