High-dispersity dye color paste as well as preparation method and application thereof
By combining multi-stage grinding with specific dispersants, the problem of dye particle aggregation during the preparation of disperse dye pastes was solved, achieving high dispersibility and stability, and improving the dyeing effect on polylactic acid fabrics.
Patent Information
- Application Number
- CN202511478177.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-01-16
AI Technical Summary
In the existing technology, disperse dye pastes have problems such as dye particles easily agglomerating and precipitating during the preparation process, resulting in poor dyeing uniformity, low dyeing rate and poor color fastness. In particular, the dyeing effect on polylactic acid fabrics is not good. In addition, conventional dispersants may affect the fluorescence properties of dyes and the viscosity stability of the paste.
The dye powder was processed using a two-stage mixing and two-stage grinding combined with a three-stage nano-grinding method. Styrene-maleic anhydride copolymer and modified polyether were used as dispersants. A stable dispersion system was formed through multi-stage grinding and stirring. Methyl cinnamate and anisene were added to improve dispersion performance and compatibility. The pH value was adjusted to 5 for polylactic acid fabric dyeing.
It significantly improves the dispersion performance and stability of dye pastes, enhances the dyeing uniformity and color fastness of polylactic acid fabrics, avoids particle aggregation, and strengthens the diffusion performance of dyes in fabrics and the wetting effect of dispersants.
Abstract
Description
Technical Field
[0001] This invention belongs to the field of ink paste technology for printing and dyeing, and specifically relates to a highly dispersible dye paste, its preparation method, and its application. Background Technology
[0002] In the current dyeing and printing industry, disperse dyes are an important class of non-water-soluble dyes. They contain polar groups such as -NO2, -NH2, -OH, and -CN and are widely used in the dyeing and printing of polyester and cellulose fibers. However, due to the lack of hydrophilic groups in their molecular structure, they have poor water solubility, which makes it easy for dye particles to aggregate and precipitate. This affects the uniformity of dyeing, the dyeing rate, and the color fastness of the final product. The aggregation of dye particles may also clog screens and nozzles, and even affect the diffusion performance of the dye, reducing production efficiency.
[0003] To address this issue, the introduction of dispersants has become a key technology. Dispersants adsorb onto the surface of dye particles, forming a stable hydrophilic protective layer. Utilizing electrostatic repulsion or steric hindrance, they ensure uniform dispersion of the dye in the aqueous medium, preventing aggregation and precipitation. Common dispersants include lignin sulfonates, naphthalene sulfonate formaldehyde condensates, and fatty alcohol polyoxyethylene ethers, which can improve the storage stability, high-temperature dispersibility, and dyeing reproducibility of dyes. However, for fluorescent dyes such as Disperse Red 362, lignin sulfonates and naphthalene sulfonate formaldehyde condensates typically reduce the fluorescence properties of the dye, resulting in a darker color. Furthermore, because lignin is easily decomposed into small molecules at high temperatures, it causes instability in the viscosity of the dye paste. Fatty alcohol polyoxyethylene ethers alone do not provide sufficient charge stability and are prone to causing sedimentation problems in the dye paste.
[0004] Furthermore, existing technologies typically involve directly mixing the dye powder and dispersant for primary grinding when preparing disperse dye pastes. This results in poor and unstable dispersion performance of the prepared dye pastes and dye liquors. Additionally, dye liquors prepared by grinding conventional dispersants and powders have poor dyeing effects on polylactic acid fabrics. Summary of the Invention
[0005] The purpose of this invention is to provide a highly dispersible dye paste, its preparation method, and its application, which solves the above-mentioned technical problems, provides dye paste with good dispersibility and stability, and has a good dyeing effect on polylactic acid fabrics.
[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a method for preparing a highly dispersible dye paste, comprising the following steps:
[0007] S1. Grinding: The dye powder undergoes two-stage mixing and two-stage grinding. The disperse dye powder is first mixed in a pneumatic mixer for 5-10 minutes, then ground in a first-stage disc mill for 10-12 minutes, resulting in a disperse dye powder particle size ≤1200nm. The disperse dye powder is then pneumatically conveyed to a second-stage pneumatic mixer for 5-10 minutes, and then ground in a second-stage horizontal turbine mill for 15-20 minutes, resulting in a disperse dye powder particle size ≤500nm and a PDI ≤0.6.
[0008] S2. Dispersant preparation: Add styrene-maleic anhydride copolymer and modified polyether to a sealed container, then add potassium persulfate as an initiator, and stir for 20-30 minutes at a speed of 800-1200 rpm to obtain the dispersant;
[0009] S3. Slowly add the ground disperse dye powder to the dispersant. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0010] S4, Nano Grinding: The uniformly mixed slurry enters the three-stage nano grinding system for grinding;
[0011] S5. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain a highly dispersible dye paste.
[0012] Further, in step S4, the diameters of the small-diameter grinding beads in the three-stage nano-grinding mill are 0.2 mm, 0.1 mm, and 0.04 mm, respectively. The first-stage grinding time is 2 min, the second-stage grinding time is 8 min, and the third-stage grinding time is 35-45 min. The maximum particle size of the disperse dye pigment is ≤110 nm, the PDI reaches 0.11, the Span is ≤0.6, and the D... 90 ≤ 99 nm.
[0013] Further, in step S2, the molar ratio of styrene-maleic anhydride copolymer to modified polyether is 2:1, and potassium persulfate accounts for 2% to 5% of the mass of the styrene-maleic anhydride and modified polyether mixture.
[0014] Furthermore, in step S2, the modified polyether has an EO-PO-EO structure, with the EO segment accounting for 40%~70% and the PO segment accounting for 30-60%. The end-capping agent of the modified polyether is a substance containing carboxyl and sulfonic acid groups.
[0015] Further, in step S2, a mixture of methyl cinnamate and anisene in a molar ratio of 1:1 is first added to a sealed container, wherein the molar ratio of the methyl cinnamate and anisene mixture to the styrene-maleic anhydride copolymer is 2:1.
[0016] Furthermore, in step S3, the mass ratio of disperse dye powder to dispersant is 10:(2~5).
[0017] A highly dispersible dye paste is prepared using the above-described preparation method.
[0018] An application of a highly dispersible dye paste, wherein the dye paste is prepared into a dye solution with pH=5 for dyeing polylactic acid fabrics.
[0019] The beneficial effects of this invention are:
[0020] 1. This application employs a two-stage mixing and two-stage grinding process for the dispersed dye powder. The dispersed dye powder is first mixed in a pneumatic mixer, and after uniform mixing, it is ground in a first-stage disc mill. After the first-stage grinding, it is mixed in a second-stage pneumatic mixer, and after uniform mixing, it is ground in a second-stage mill. This two-stage mixing and grinding process ensures uniform mixing of particles of different sizes. During grinding, it helps to concentrate the particle size distribution of the powder, avoiding uneven particle size, thus providing a guarantee for the subsequent nano-grinding system and improving dispersion efficiency. After the pigment and dispersant are uniformly mixed, they enter a three-stage nano-grinding system. Based on the minimum grinding bead size set for different levels of mills, the dye particle size can be reduced in a stepwise manner. Staged grinding can quickly achieve the required particle size, avoiding over-grinding that could cause particle agglomeration. It also improves the contact between the dispersant and the dye powder particles, enhancing the wetting and dispersing effect of the dispersant. After grinding in the three-stage nano-grinding system, the pigment PDI reaches 0.11, Span ≤ 0.6, and D 90 With a particle size of ≤ 90 nm and a maximum particle size of < 120 nm, the dispersion performance of the dispersed pigment is significantly improved.
[0021] 2. In this application, the anhydride groups in the styrene-maleic anhydride (SMA) molecular chain can be hydrolyzed to generate carboxyl groups, providing strong polar adsorption sites. Hydroxyl groups on the dye surface form hydrogen bonds or electrostatic interactions. The EO / PO block structure of the modified polyether combines with the SMA backbone through hydrophobic segments and extends into the solvent to achieve steric stability. This dual effect increases the absolute value of the zeta potential of the dispersion system by more than 30%, significantly improving the dispersion performance of the dye paste. The flexible movement of the modified polyether side chains can effectively buffer the collision energy of particles, prevent re-agglomeration, and further improve dispersion performance and stability.
[0022] 3. In this application, methyl cinnamate and anisene are added to the dispersant. On the one hand, methyl cinnamate can act as a wetting agent to wet the dye, and anisene can ensure that the modified polyether chain is always in an extended state, thereby improving the dispersion performance of the dye paste. On the other hand, methyl cinnamate can act as a carrier. Its aromatic ester structure can be well matched with polylactic acid materials. Moreover, since its solubility is similar to that of polylactic acid materials, it can diffuse into the interior of polylactic acid materials earlier than the dye to weaken the inter-fiber forces, so that the dye in the dispersed color paste can enter the interior of polylactic acid for dyeing more easily, thereby improving the dyeing uniformity of the dye solution prepared from the color paste.
[0023] 4. The end-capping agent of the modified polyether in this application contains polar groups such as carboxyl groups and sulfonic acid groups, which can further enhance the compatibility with raw materials and further improve the dispersibility and stability of dye pastes. Detailed Implementation
[0024] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0025] Preparation of a highly dispersible dye paste
[0026] Example 1
[0027] S1. Grinding: The dye powder undergoes two-stage mixing and two-stage grinding. The disperse dye powder is first mixed in a pneumatic mixer for 5-10 minutes, then ground in a first-stage disc mill for 10-12 minutes, resulting in a disperse dye powder particle size ≤1200nm. The disperse dye powder is then pneumatically conveyed to a second-stage pneumatic mixer for 5-10 minutes, and then ground in a second-stage horizontal turbine mill for 15-20 minutes, resulting in a disperse dye powder particle size ≤500nm and a PDI ≤0.6.
[0028] S2. Dispersant preparation: First, add a mixture of methyl cinnamate and anisene in a molar ratio of 1:1 to a sealed container. Then, add styrene-maleic anhydride copolymer and modified polyether, wherein the molar ratio of styrene-maleic anhydride copolymer and modified polyether is 2:1, and the molar ratio of the methyl cinnamate and anisene mixture to the styrene-maleic anhydride copolymer is 2:1. Then, add potassium persulfate as an initiator, wherein the potassium persulfate accounts for 2% to 5% of the mass of the styrene-maleic anhydride and modified polyether mixture. Stir at 800 to 1200 rpm for 20 to 30 minutes to obtain a dispersant. The modified polyether has an EO-PO-EO structure, with EO segments accounting for 40% and PO segments accounting for 30%. The end-capping agent of the modified polyether is a substance containing carboxyl and sulfonic acid groups.
[0029] S3. Slowly add the ground disperse dye powder to the dispersant. The mass ratio of disperse dye powder to dispersant is 10:2. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0030] S4. Nano-grinding: The uniformly mixed slurry enters a three-stage nano-grinding system for grinding. The diameters of the small-diameter grinding beads in the three-stage nano-grinding machine are 0.2mm, 0.1mm, and 0.04mm, respectively. The first-stage grinding time is 2 minutes, the second-stage grinding time is 8 minutes, and the third-stage grinding time is 35~45 minutes. The maximum particle size of the disperse dye pigment is ≤110nm, PDI reaches 0.11, Span ≤ 0.6, and D... 90 ≤ 99 nm;
[0031] S5. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain highly dispersible dye paste F1.
[0032] Example 2
[0033] S1. Grinding: The dye powder undergoes two-stage mixing and two-stage grinding. The disperse dye powder is first mixed in a pneumatic mixer for 5-10 minutes, then ground in a first-stage disc mill for 10-12 minutes, resulting in a disperse dye powder particle size ≤1200nm. The disperse dye powder is then pneumatically conveyed to a second-stage pneumatic mixer for 5-10 minutes, and then ground in a second-stage horizontal turbine mill for 15-20 minutes, resulting in a disperse dye powder particle size ≤500nm and a PDI ≤0.6.
[0034] S2. Dispersant preparation: First, add a mixture of methyl cinnamate and anisene in a molar ratio of 1:1 to a sealed container. Then, add styrene-maleic anhydride copolymer and modified polyether, wherein the molar ratio of styrene-maleic anhydride copolymer and modified polyether is 3:1, and the molar ratio of the methyl cinnamate and anisene mixture to styrene-maleic anhydride copolymer is 2:1. Then, add potassium persulfate as an initiator, wherein the potassium persulfate accounts for 2% to 5% of the mass of the styrene-maleic anhydride and modified polyether mixture. Stir at 800 to 1200 rpm for 20 to 30 minutes to obtain a dispersant. The modified polyether has an EO-PO-EO structure, with EO segments accounting for 40% and PO segments accounting for 50%. The end-capping agent of the modified polyether is a substance containing carboxyl and sulfonic acid groups.
[0035] S3. Slowly add the ground disperse dye powder to the dispersant. The mass ratio of disperse dye powder to dispersant is 10:5. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0036] S4. Nano-grinding: The uniformly mixed slurry enters a three-stage nano-grinding system for grinding. The diameters of the small-diameter grinding beads in the three-stage nano-grinding machine are 0.2mm, 0.1mm, and 0.04mm, respectively. The first-stage grinding time is 2 minutes, the second-stage grinding time is 8 minutes, and the third-stage grinding time is 35~45 minutes. The maximum particle size of the disperse dye pigment is ≤110nm, PDI reaches 0.11, Span ≤ 0.6, and D... 90 ≤ 99 nm;
[0037] S5. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain highly dispersible dye paste F2.
[0038] Example 3
[0039] S1. Grinding: The dye powder undergoes two-stage mixing and two-stage grinding. The disperse dye powder is first mixed in a pneumatic mixer for 5-10 minutes, then ground in a first-stage disc mill for 10-12 minutes, resulting in a disperse dye powder particle size ≤1200nm. The disperse dye powder is then pneumatically conveyed to a second-stage pneumatic mixer for 5-10 minutes, and then ground in a second-stage horizontal turbine mill for 15-20 minutes, resulting in a disperse dye powder particle size ≤500nm and a PDI ≤0.6.
[0040] S2. Dispersant preparation: First, add a mixture of methyl cinnamate and anisene in a molar ratio of 1:1 to a sealed container. Then, add styrene-maleic anhydride copolymer and modified polyether, wherein the molar ratio of styrene-maleic anhydride copolymer and modified polyether is 2.5:1, and the molar ratio of the methyl cinnamate and anisene mixture to styrene-maleic anhydride copolymer is 2:1. Then, add potassium persulfate as an initiator, wherein the potassium persulfate accounts for 2% to 5% of the mass of the styrene-maleic anhydride and modified polyether mixture. Stir at 800 to 1200 rpm for 20 to 30 minutes to obtain a dispersant. The modified polyether has an EO-PO-EO structure, with EO segments accounting for 50% and PO segments accounting for 30%. The end-capping agent of the modified polyether is a substance containing carboxyl and sulfonic acid groups.
[0041] S3. Slowly add the ground disperse dye powder to the dispersant. The mass ratio of disperse dye powder to dispersant is 10:4. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0042] S4. Nano-grinding: The uniformly mixed slurry enters a three-stage nano-grinding system for grinding. The diameters of the small-diameter grinding beads in the three-stage nano-grinding machine are 0.2mm, 0.1mm, and 0.04mm, respectively. The first-stage grinding time is 2 minutes, the second-stage grinding time is 8 minutes, and the third-stage grinding time is 35~45 minutes. The maximum particle size of the disperse dye pigment is ≤110nm, PDI reaches 0.11, Span ≤ 0.6, and D... 90 ≤ 99 nm;
[0043] S5. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain highly dispersible dye paste F3.
[0044] Comparative Example 1
[0045] S1. Dispersant preparation: First, add a mixture of methyl cinnamate and anisene in a molar ratio of 1:1 to a sealed container. Then, add styrene-maleic anhydride copolymer and modified polyether, wherein the molar ratio of styrene-maleic anhydride copolymer and modified polyether is 2.5:1, and the molar ratio of the methyl cinnamate and anisene mixture to styrene-maleic anhydride copolymer is 2:1. Then, add potassium persulfate as an initiator, wherein the potassium persulfate accounts for 2% to 5% of the mass of the styrene-maleic anhydride and modified polyether mixture. Stir for 20 to 30 minutes at a speed of 800 to 1200 rpm to obtain a dispersant. The modified polyether has an EO-PO-EO structure, with the EO segment accounting for 50% and the PO segment accounting for 30%. The end-capping agent of the modified polyether is a substance containing carboxyl and sulfonic acid groups.
[0046] S2. Slowly add the ground disperse dye powder to the dispersant. The mass ratio of disperse dye powder to dispersant is 10:4. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0047] S3. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain a highly dispersible dye paste.
[0048] Comparative Example 2
[0049] S1. Grinding: The dye powder undergoes two-stage mixing and two-stage grinding. The disperse dye powder is first mixed in a pneumatic mixer for 5-10 minutes, then ground in a first-stage disc mill for 10-12 minutes, resulting in a disperse dye powder particle size ≤1200nm. The disperse dye powder is then pneumatically conveyed to a second-stage pneumatic mixer for 5-10 minutes, and then ground in a second-stage horizontal turbine mill for 15-20 minutes, resulting in a disperse dye powder particle size ≤500nm and a PDI ≤0.6.
[0050] S2. Dispersant preparation: Add styrene-maleic anhydride copolymer and modified polyether to a sealed container, wherein the molar ratio of styrene-maleic anhydride copolymer and modified polyether is 2.5:1, then add potassium persulfate as an initiator, the amount of potassium persulfate being 2%~5% of the mass of the styrene-maleic anhydride and modified polyether mixture, and stir for 20~30 min at a speed of 800~1200 rpm to obtain a dispersant. The modified polyether has an EO-PO-EO structure, and the EO segment accounts for 50% and the PO segment accounts for 30%. The end-capping agent of the modified polyether is a substance containing carboxyl and sulfonic acid groups.
[0051] S3. Slowly add the ground disperse dye powder to the dispersant. The mass ratio of disperse dye powder to dispersant is 10:4. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0052] S4. Nano-grinding: The uniformly mixed slurry enters a three-stage nano-grinding system for grinding. The diameters of the small-diameter grinding beads in the three-stage nano-grinding machine are 0.2mm, 0.1mm, and 0.04mm, respectively. The first-stage grinding time is 2 minutes, the second-stage grinding time is 8 minutes, and the third-stage grinding time is 35~45 minutes. The maximum particle size of the disperse dye pigment is ≤110nm, PDI reaches 0.11, Span ≤ 0.6, and D... 90 ≤ 99 nm;
[0053] S5. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain highly dispersible dye paste D2.
[0054] Comparative Example 3
[0055] S1. Grinding: The dye powder undergoes two-stage mixing and two-stage grinding. The disperse dye powder is first mixed in a pneumatic mixer for 5-10 minutes, then ground in a first-stage disc mill for 10-12 minutes, resulting in a disperse dye powder particle size ≤1200nm. The disperse dye powder is then pneumatically conveyed to a second-stage pneumatic mixer for 5-10 minutes, and then ground in a second-stage horizontal turbine mill for 15-20 minutes, resulting in a disperse dye powder particle size ≤500nm and a PDI ≤0.6.
[0056] S2. Dispersant preparation: First, add a mixture of methyl cinnamate and anisene in a molar ratio of 1:1 to a sealed container, then add a commercially available lignin sulfonate dispersant, wherein the molar ratio of the methyl cinnamate and anisene mixture to the lignin sulfonate is 2:1, then add potassium persulfate as an initiator, wherein the potassium persulfate accounts for 2% to 5% of the mass of the lignin sulfonate, and stir for 20 to 30 minutes at a speed of 800 to 1200 rpm to obtain the dispersant;
[0057] S3. Slowly add the ground disperse dye powder to the dispersant. The mass ratio of disperse dye powder to dispersant is 10:4. After the addition is complete, adjust the speed to 2500~3000 rpm and continue to stir and disperse for 30~45 minutes. During the stirring process, keep the temperature at 30~45℃ to obtain a uniformly mixed slurry.
[0058] S4. Nano-grinding: The uniformly mixed slurry enters a three-stage nano-grinding system for grinding. The diameters of the small-diameter grinding beads in the three-stage nano-grinding machine are 0.2mm, 0.1mm, and 0.04mm, respectively. The first-stage grinding time is 2 minutes, the second-stage grinding time is 8 minutes, and the third-stage grinding time is 35~45 minutes. The maximum particle size of the disperse dye pigment is ≤110nm, PDI reaches 0.11, Span ≤ 0.6, and D... 90 ≤ 99 nm;
[0059] S5. Color matching: The nano-ground slurry is transferred to the paint mixing tank and stirred at a speed of 500~800 rpm. During the stirring process, defoamer and leveling agent are added. After stirring is completed, the mixture is filtered to obtain highly dispersible dye paste D3.
[0060] Example 4
[0061] In the preparation of the above color paste, the dye powder used is Disperse Red 362. The disperse red pastes F1-F3 and D1-D3 prepared above are configured into a red dyeing solution with pH=5 and used to dye polylactic acid fabrics. The K / S value is measured to measure the uniformity of the color paste dyeing.
[0062] Zeta potential: Take a drop of dye paste suspension, dilute it 2500 times with deionized water, and test the zeta potential of the dye particle surface with a nanoparticle size analyzer under constant temperature of 25℃. Take the average value after 3 measurements.
[0063] Stability: Take the dye paste into a centrifuge tube and centrifuge at 3000 r / min for 15 min. Observe whether the paste is separated into layers or precipitates after centrifugation.
[0064] The test results are shown in the table below:
[0065] sample K / S value absolute value of zeta potential (mV) stability F1 9.98 50 No fine particles F2 9.92 47 No fine particles F3 8.78 35 No fine particles D1 4.02 20 There are fine particles D2 4.52 23 There are fine particles D3 6.35 26 There are fine particles
[0066] In summary, styrene-maleic anhydride and modified polyether can effectively improve the dispersibility and stability of dye pastes as dispersants. Dispersed pastes treated by a two-stage mixing and two-stage grinding + three-stage nano-grinding system have good dispersibility and stability. Dispersed pastes with added methyl cinnamate and anisene have better coloring effect.
Claims
1. A process for the preparation of a high dispersion dye paste, characterized in that: The method comprises the following steps: S1, grinding: the dispersed dye toner is processed by two-stage mixing and two-stage grinding, the dispersed dye toner is mixed in a pneumatic mixer for 5-10 minutes, is ground in a first disc sand mill for 10-12 minutes, and the particle size of the dispersed dye toner is less than or equal to 1200 nm; the dispersed dye toner is transported to a second pneumatic mixer by pneumatic conveying, is mixed in the second pneumatic mixer for 5-10 minutes, is ground in a second horizontal turbine sand mill for 15-20 minutes, and the particle size of the dispersed dye toner is less than or equal to 500 nm and PDI is less than or equal to 0.6; S2, preparation of a dispersant: a styrene-maleic anhydride copolymer and a modified polyether are added to a closed container, an initiator potassium persulfate is added, and stirring is performed at a rotation speed of 800-1200 rpm for 20-30 minutes to obtain the dispersant; S3, the ground dispersed dye toner is slowly added to the dispersant, the rotation speed is adjusted to 2500-3000 rpm after the addition is completed, and stirring and dispersion are continuously performed for 30-45 minutes, the temperature is ensured to be 30-45 DEG C during the stirring process, and a uniformly mixed slurry is obtained; S4, nano-grinding: the uniformly mixed slurry is ground in a three-stage nano-grinding system; S5, color matching: the slurry after nano-grinding is transferred to a paint mixing tank, stirring is performed at a speed of 500-800 rpm, a defoaming agent and a leveling agent are added during the stirring process, and a high-dispersibility dye color paste is obtained after filtration.
2. A process for the preparation of a high dispersion dye paste according to claim 1, characterized in that: The diameter of the small particle size grinding beads of the three-stage nano grinder in the step S4 is 0.2 mm, 0.1 mm and 0.04 mm respectively, the first-stage grinding time is 2 min, the second-stage grinding time is 8 min, the third-stage grinding time is 35-45 min, the maximum particle size of the dispersed dye toner is ≤ 110 nm, the PDI reaches 0.11, the Span is ≤ 0.6, and the D 90 ≤ 99 nm.
3. A process for the preparation of a high dispersion dye paste as claimed in claim 1, wherein: In the step S2, the molar ratio of the styrene-maleic anhydride copolymer and the modified polyether is 2-3:1, and the potassium persulfate accounts for 2%-5% of the mass of the styrene-maleic anhydride and the modified polyether mixture.
4. A process for the preparation of a high dispersion dye paste as claimed in claim 1, wherein: In the step S2, the modified polyether has an EO-PO-EO structure, the EO segment accounts for 40%-70%, and the PO segment accounts for 30-60%, and the end-capping agent of the modified polyether is a substance containing a carboxyl group and a sulfonic acid group.
5. A process for the preparation of a high dispersion dye paste as claimed in claim 1, wherein: In the step S2, a mixture of cinnamyl methyl ester and anisalene is first added to the closed container, the mixture of cinnamyl methyl ester and anisalene is obtained by mixing the two at a molar ratio of 1:1, and the molar ratio of the mixture of cinnamyl methyl ester and anisalene to the styrene-maleic anhydride copolymer is 2:
1.
6. A process for the preparation of a high dispersion dye paste as claimed in claim 1, wherein: In the step S3, the mass ratio of the dispersed dye toner to the dispersant is 10: (2-5).
7. A high dispersion dye paste according to claim 1, characterized by: The preparation method is prepared by any one of claims 1-6.
8. Use of a highly dispersible dye paste according to claim 7, characterized in that: The dye color paste is configured into a dye liquor with pH=5, and is used for dyeing a polylactic acid fabric.