Pink TAED bleaching activator particles and preparation method thereof

Abstract

The invention provides pink TAED bleaching activator particles and a preparation method thereof. The pink TAED bleaching activator particles are prepared by mixing and pinching a TAED bleaching activator, a coloring agent, a binder, other auxiliaries and water, the coloring agent is a transition metal coordination compound which takes manganese and iron ions as central atoms and polydentate macrocyclic organic molecules of a plurality of donor atoms of N, NR, PR, O or S with lone pair electrons as ligands. The method has the advantages that the stability and the activating and bleaching effect of the bleaching activator particles are improved, and compared with the prior art, the method has better environmental protection performance, stability, product identification and tracking performance, product attractiveness and energy-saving and emission-reducing effects.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of oxygen-based bleaching activator particles, and in particular to pink TAED bleaching activator particles and a preparation method thereof. Background Art

[0002] Compared to chlorine bleaches, oxygen-based bleaches are not only environmentally friendly, but also offer advantages such as high whiteness, good whiteness stability, and compatibility with a wide range of fibers and their blends, making them widely used. However, oxygen-based bleaches, such as sodium perborate or sodium percarbonate, typically require high temperatures (≥60°C) or strong alkaline conditions to fully exert their bleaching effect. This results in high energy consumption during the rinsing process and high alkalinity in the wastewater discharged during the rinsing process.

[0003] Tetraacetylethylenediamine, or TAED, is an amide-based bleach activator. When used in conjunction with sodium percarbonate bleach, it effectively enhances bleaching performance and reduces rinse temperatures, contributing to energy conservation and emission reduction during the rinse process, as well as promoting a low-carbon lifestyle. TAED, due to its outstanding bleach activation performance, is widely used as a low-temperature oxygen-based bleaching aid in daily chemical detergents. In this sector, to highlight the product's superior bleaching properties and enable tracking, identification, and functional indication of the TAED component, TAED is typically mixed with organic pigments and colorants and then granulated to create TAED granules with a specific color. When added to daily chemical detergent base powder, the vibrant and brightly colored TAED granules, particularly red TAED granules, not only enhance the product's overall appearance and make it more attractive, but also further enhance its recognition, aiding user identification and selection.

[0004] However, existing bleach activator coloring and granulation processes primarily use traditional organic pigments as the bleach activator colorant. For example, Kao Corporation's patent TW401457B mixes and granulates a bleach activator, a binder, and cyanine green or phthalocyanine blue pigments to produce green or blue bleach activator granules. Another example, Lion Corporation's patent JP1997013089A, proposes dispersing a bleach activator, a dye, and / or a pigment in a liquid binder under anhydrous conditions and then mixing and granulating the resulting colored bleach activator granules. While traditional organic pigments offer excellent coloring properties, they can impart a vibrant color to the bleach activator granules and facilitate tracking and identification of the corresponding component products within detergents. However, bleach activator particles prepared using traditional organic pigments as colorants can dissolve or penetrate into fabric fibers during the washing process, causing not only spots or discoloration in the fabric, affecting its appearance, but also residual pigment components in the fabric that may have an impact on human health. Furthermore, the pigments may contain environmentally harmful chemicals that are released into the water during the washing process, easily causing environmental pollution. Furthermore, organic pigments themselves have a certain degree of hiding power, and after being colored by organic pigments, the bleach activator particles will weaken their bleaching activation effect, resulting in poor bleaching results. Furthermore, the non-water-soluble nature of organic pigments can easily lead to uneven dispersion of the colorant within the bleach activator particles, affecting the color and appearance of the bleach activator particles.

[0005] Therefore, developing a new colored bleach activator particle and a preparation method thereof is an important research topic to improve the above-mentioned defects of the current bleach activator particles. Summary of the Invention

[0006] The present invention aims to provide a pink TAED bleaching activator particle which is efficient and stable, improves product identification and tracking, function indication, and improves overall aesthetics, and a preparation method thereof.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A pink TAED bleach activator granule is prepared by mixing a TAED bleach activator, a colorant, a binder, other additives, and water. The weight percentages of the components are as follows: a TAED component content of 50-90 wt%, a colorant component content of 0.1%-10 wt%, a binder component content of 5-20 wt%, an inorganic additive component content of 0-10 wt%, and a moisture content of less than 3.0%. Preferably, the TAED component content is 70-85 wt%, the colorant component content is 1-6 wt%, the binder component content is 8-15 wt%, and the moisture content is less than 1.5 wt%.

[0009] The colorant uses a transition metal coordination compound. As a potential new type of pigment / dye substance, the transition metal coordination compound can change the physicochemical structural characteristics of the coordination compound by regulating factors such as the transition metal central atom, ligand type, coordination number and coordination environment, and accurately regulate the absorption of light of a specific wavelength to produce a specific color. The transition metal central atom can provide a hybrid orbital to stabilize the electrons of the ligand, ensuring that the transition metal organic coordination compound has excellent light / thermal stability and chemical stability; at the same time, some transition metal coordination compounds have special optical properties (fluorescence or phosphorescence) and can be used for security marking or biological marking, further enhancing its application value as a colorant. In response to the problems currently existing in the preparation of TAED particles using traditional organic pigments as colorants, this patent proposes a soluble transition metal coordination compound as a colorant to prepare a bright pink TAED bleaching activator particle. More specifically, manganese is used as the central atom of the coordination compound, and polynitrogen heterocycles are used as ligands to construct a soluble manganese-based-transition metal coordination complex as a colorant to prepare bright pink TAED particles. Compared with other transition metal coordination compounds, it has less impact on the body and the environment, and at the same time has bright colors and excellent photothermal stability and chemical stability, and has a certain promoting effect on peroxide bleaching, so as to solve the problems of pigment residue and covering in the washing process of traditional organic pigment-colored TAED, and uneven color dispersion in bleaching activator particles.

[0010] The colorant is a transition metal coordination compound having a manganese or iron ion as a central atom and a multidentate macrocyclic organic molecule having a donor atom such as N, NR, PR, O, or S with a lone pair of electrons as a ligand. The central atom of the transition metal coordination compound is preferably an iron ion in a divalent or trivalent oxidation state or a manganese ion in a trivalent or tetravalent oxidation state. Trivalent or tetravalent manganese ions, which have low biological toxicity and no environmental impact, are further preferred, and tetravalent manganese ions are even more preferred. The ligands of the transition metal coordination compound are preferably macrocyclic molecules containing N, NR, O with lone pair electron donor atoms, such as 1,4,7-triazacyclononane, 1,4,7-trimethyl-1,4,7-triazacyclononane, 1,5,9-trimethyl-1,5,9-triazacyclododecane, 1,2-bis-(4,7-dimethyl-1,4,7-triazacyclo-1-yl)ethane, 1,4,7,10-tetraazacyclododecane and its derivatives, 1,4,8,11-tetraazacyclotetradecane Alkane and its derivatives, 2,2′,2″-terpyridine and its derivatives, as well as 15-crown ether 5 and its derivatives, 18-crown ether 6 and its derivatives, 24-crown ether 8 and its derivatives; further preferred are 1,4,7-trimethyl-1,4,7-triazacyclononane and 1,2-bis-(4,7-dimethyl-1,4,7-triazacyclo-1-yl)ethane; further preferred are multidentate macrocyclic molecules containing atoms such as N and NR; and further preferred are 1,4,7-trimethyl-1,4,7-triazacyclononane.

[0011] The transition metal coordination compound of the above preferred combination is used, such as [MnⅣ2(μ

[0012] -O)3(Me-TACN)2](PF6)2, [MnⅣ2(μ-O)3(Me-TACN)2](SO4), [MnⅣ2(μ

[0013] -O)3(Me-TACN)2](OAc)2, [MnIV2(μ-O)3(Me-TACN)2](Cl)2.

[0014] The added binder and other additives can improve the cohesion and strength of the colored TAED particles.

[0015] The binder is one or more mixtures of fatty acids, fatty alcohol alkoxy compounds, and high molecular weight polymers. Fatty acid binders are preferably C8 to C22 organic fatty acids, such as one or more mixtures of lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and linoleic acid. Fatty alcohol alkoxy binders are preferably C8 to C22 fatty alcohol ethoxy compounds, propoxy compounds, or ethoxy-propoxy copolymers that are solid at room temperature. High molecular weight polymer binders are preferably natural high molecular weight polymers, modified natural high molecular weight polymers, and synthetic anionic, cationic, and amphiphilic high molecular weight polymers.

[0016] Natural polymer binders and modified natural polymer binders are preferably cellulose and its derivative binders, such as hydroxypropyl methylcellulose, carboxymethyl cellulose, ethyl cellulose, etc.; polysaccharide binders are such as gelatin, chitosan, sodium alginate, etc.; starch and modified starch binders are such as corn starch, potato starch, modified cross-linked starch, etc. Synthetic polymer binders are preferably synthetic polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylates (salts) and copolymers, povidone, and polyvinyl acetate.

[0017] The binder in the TAED particle mixing and granulation process is further preferably a natural polymer material such as sodium carboxymethyl cellulose or a copolymerized polyacrylic acid salt polymer material, and further preferably sodium carboxymethyl cellulose with a degree of substitution of 0.6-0.8, a viscosity of less than 15 mPa.s, a purity of 85% or more, and a pH value of 6-8, or a partially neutralized or fully neutralized sodium salt of acrylic acid-maleic anhydride copolymer with a relative molecular mass of 2000-70000 g / mol and a pH value of 4-8.

[0018] The auxiliary agent is an inorganic auxiliary agent such as calcium sulfate or sodium sulfate, and sodium sulfate is more preferably used, so as to improve the stability and overall aesthetics of the colored TAED particles.

[0019] A method for preparing pink TAED bleach activator granules comprises: mixing TAED powder, a transition metal coordination compound colorant, a binder, an inorganic additive, and water all at once or in stages, then extruding the mixture into strips using an extruder. The particle shape and size are controlled using a rotary cutter in conjunction with a granulator, and the mixture is dried and sieved to obtain a colored TAED granule product of the target size. A staged mixing method is preferred, with a dry and wet mixing method being further preferred. Specifically, in the mixing stage, the TAED powder, binder, and inorganic additive are first dry-mixed in a dry mixer for 10 to 50 minutes, followed by spraying an aqueous solution containing 5 to 15 wt% of the transition metal coordination compound colorant into the wet mixer for kneading for 10 to 60 minutes.

[0020] The dry blending mixer is preferably a plowshare mixer, a ribbon mixer, a zero-gravity mixer and a double-helix cone mixer, and is particularly preferably a double-helix cone mixer.

[0021] The kneader is preferably a single-layer kneader or a double-layer jacketed kneader, and particularly preferably a double-layer jacketed bonding machine to control the temperature of the material in the bonding machine.

[0022] The extruder is preferably a disc extruder, a single-screw extruder, a twin-screw extruder and a multi-screw extruder, preferably a screw extruder.

[0023] The colored TAED particles are preferably dried in an oven, a moving bed, or a fluidized bed, with fluidized bed drying being more preferred. The drying temperature is preferably controlled at 50°C to 100°C, preferably 60°C to 90°C, and particularly preferably 70°C to 80°C.

[0024] The average size of the sieved colored TAED particle product is 0.1-1.6 mm, preferably 0.2-1.2 mm, more preferably 0.3-1.0 mm.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The present invention discloses pink TAED bleaching activator particles and a preparation method thereof, which solve the problems of pigment residue and covering during the washing process of conventional organic pigment-colored bleaching activator particles, as well as uneven dispersion in the bleaching activator particles. The invention also improves the stability and activation bleaching effect of the bleaching activator particles. Compared with existing technologies, the invention has better environmental performance, stability, product identification and tracking performance, product aesthetics, and energy saving and emission reduction effects.

[0027] Specifically, the use of transition metal coordination compounds as colorants to replace traditional organic pigments avoids the residue of pigments on fabrics during the washing process and their adverse effects on the environment and human health, while also solving the problem of pigment color loss on fabrics. Since transition metal coordination compounds have excellent solubility and stability in aqueous solution, they have good dispersibility and coloring properties during the granulation process with TAED powder. TAED particles have uniform color and good product identification and tracking properties, making them convenient for users to identify and use, and more conducive to improving the overall aesthetics of washing products. In addition, TAED particles colored with transition metal coordination compounds can further enhance the bleaching effect of peroxides, reduce rinsing temperatures, achieve energy conservation and emission reduction, and promote low-carbon living, which is in line with current environmental protection trends and requirements. DETAILED DESCRIPTION

[0028] Comparative Case 1

[0029] Preparation of pink TAED particles: 0.1 kg of chindisin red pigment was pre-dispersed in 1.9 kg of water to prepare a slurry with a pigment concentration of 5 wt%; 4 kg of TAED powder, 1.0 kg of sodium carboxymethyl cellulose-CMC powder, and 1.4 kg of sodium sulfate were added to a 15 L conical screw mixer and mixed thoroughly for 20 minutes; the mixed TAED, CMS, and Na2SO4 mixture was transferred to a 15 L double-layer jacketed kettle kneader and the chindisin red pigment slurry was evenly sprayed on the surface of the kneader material using a fluid delivery pump and a nozzle. After the slurry spraying was completed, the kneader continued to knead the wet material for 20 minutes; the uniformly kneaded wet material was extruded through a twin-screw extruder (equipped with a 1.0 mm extrusion mesh) with a screw diameter of Φ25 mm and a yield of 5 kg / h; the extrudate was cut by a rotary cutter, and the speed of the rotary cutter was controlled at 200 rpm; the cut particles entered the fluidized bed for drying, and the drying temperature was controlled at 70°C; the dried material was sieved through a 0.3 mm-1.0 mm target grading screen to obtain 4.2 kg of pink TAED particles, and the product yield after screening was 65%.

[0030] Comparative Case 2

[0031] Preparation of pink TAED granules: The preparation steps for TAED granules were the same as those in Comparative Example 1, except that 0.1 kg of Pigment Red 122 (2,9-dimethylquinacridone) was used instead of chindisin red pigment to prepare the colorant solution. Sieving yielded 4.5 kg of bright pink TAED granules, yielding a 69% yield after sieving.

[0032] Implementation Case 1

[0033] Synthesis of [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2: Based on a 1L double-layer jacketed reactor with stirring, 220g of deionized water, 0.4 mol of tetrahydrate-dichloromanganese (MnCl2.4H2O) and 0.4 mol of 1,4,7-trimethyl-1,4,7-triazacyclononane ligand (Me3TACN) were added in sequence, and mixed and coordinated at 25°C for 30 minutes to initially obtain a brown-yellow solution; further, the temperature in the reactor was lowered to 5°C, and 250g of a pre-configured mixture prepared by 125g-10wt% NaOH and 5wt% H2O2 was added. solution, and carry out oxidation reaction at a constant temperature for 2 hours; further, add 25g-35wt% hydrochloric acid solution to adjust the pH value of the solution to 6, and remove brown-black impurities in the solution by suction filtration; further, remove water in the solution by vacuum evaporation and concentration at a temperature below 50°C to obtain a red solid powder; further, dissolve the red solid powder in 200g ethanol solution, filter to remove insoluble NaCl salt solid, and remove the ethanol solvent from the filtrate by vacuum evaporation to obtain 82g red [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2 complex, the product purity is higher than 98wt%, and the yield is about 80%.

[0034] Preparation of pink TAED particles: First, 0.1 kg of [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2 red powder material was used as a colorant and pre-dissolved in 1.9 kg of water to prepare a red solution with a concentration of 5 wt%; further, 4 kg of TAED powder, 1.0 kg of sodium carboxymethyl cellulose-CMC powder and 1.4 kg of sodium sulfate were added to a 15 L conical screw mixer in sequence and fully mixed for 20 minutes; further, the evenly mixed TAED, CMS and Na2SO4 mixture was transferred to a 15 L double-layer jacketed kettle kneader, and the prepared coloring solution was delivered to the kneader through a fluid delivery pump and a nozzle. The mixture was evenly sprayed on the surface of the material in the kneader, and after the solution spraying was completed, the wet material was kneaded for 20 minutes; further, the evenly kneaded wet material was extruded through a twin-screw extruder (equipped with a 1.0 mm extrusion mesh) with a screw diameter of Φ25 mm and a yield of 5 kg / h; further, the extrudate was cut by a rotary cutter, and the speed of the rotary cutter was controlled at 200 rpm; further, the cut particles were sent to a fluidized bed for drying, and the drying temperature was controlled at 70°C; further, the dried material was sieved through a 0.3 mm-1.0 mm target grading screen to obtain 4.8 kg of bright pink TAED particles, and the product yield after sieving was 75%.

[0035] Implementation Case 2

[0036] Synthesis of [MnⅣ2(μ-O)3(Me-TACN)2](SO4)]: This synthesis follows the same steps as the synthesis of [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2 in Example 1, except that 0.4 mol of manganese sulfate tetrahydrate (MnSO4.4H2O) is used instead of manganese dichloride tetrahydrate (MnCl2.4H2O); and approximately 15g-50wt% sulfuric acid solution is used instead of hydrochloric acid solution for pH adjustment; ultimately, 96.5g of red [MnⅣ2(μ-O)3(Me-TACN)2](SO4) crystalline powder is obtained, with a product purity exceeding 98wt% and a product yield of up to 90%.

[0037] Preparation of pink TAED particles: The steps for preparing TAED particles were the same as those in Example 1, except that 0.1 kg of [MnⅣ2(μ-O)3(Me-TACN)2](SO4)] was used instead of [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2] to prepare the colorant solution. Finally, 4.6 kg of bright pink TAED particles were obtained by sieving, with a product yield of 70% after sieving.

[0038] Implementation Case 3

[0039] Synthesis of [MnⅣ2(μ-O)3(Me-TACN)2](CH3COO)]: This synthesis is the same as the synthesis steps of [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2 in Example 1, except that 0.4 mol of tetrahydrated manganese acetate (Mn(CH3COO)2.4H2O) is used instead of tetrahydrated manganese dichloride (MnCl2.4H2O); and about 40g-56wt% acetic acid solution is used instead of hydrochloric acid solution for pH adjustment; finally, 75g of red [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2 is obtained.

[0040] -O)3(Me-TACN)2](CH3COO)] crystal powder, the product purity is higher than 98wt%, and the product yield can reach 75%.

[0041] Preparation of pink TAED particles: The preparation steps of TAED particles were the same as those in Example 1, except that 0.1 kg [MnⅣ2(μ-O)3(Me-TACN)2](CH3COO)] was used instead of [MnⅣ2(μ

[0042] -O)3(Me-TACN)2](Cl)2] was used to prepare a colorant solution; and finally 4.7 kg of bright pink TAED particles were obtained by sieving, with a product yield of 72% after sieving.

[0043] Implementation Case 4

[0044] Synthesis of [MnⅣ2(μ-O)3(Me-TACN)2](PF6)2; Based on a 1L double-layer jacketed reactor with stirring, 220g of deionized water, 0.4 mol of tetrahydrate-manganese dichloride (MnCl2.4H2O) and 0.4 mol of 1,4,7-trimethyl-1,4,7-triazacyclononane ligand (Me3TACN) were added in sequence, and mixed and coordinated at 25°C for 30 minutes to initially obtain a brown-yellow solution; further, the temperature in the reactor was reduced to 5°C, and 250g of a pre-configured 125g-10wt% NaOH solution and 5wt% NaOH solution were added. % H2O2 solution, and carry out oxidation reaction at a constant temperature for 2 hours; further, add 25g-35wt% hydrochloric acid solution to adjust the pH value of the solution to 6, and remove brown-black impurities in the solution by suction filtration; further, dissolve 0.4 mol of potassium hexafluorophosphate in 200g deionized water, and add it to the reactor for crystallization reaction for 3 hours; further reduce the temperature of the reactor to 10°C, filter and dry, and 129g of red [MnⅣ2(μ-O)3(Me-TACN)2](PF6)2 crystal powder can be obtained, the product purity is higher than 98wt%, and the yield is about 83%.

[0045] Preparation of pink TAED particles: The steps for preparing TAED particles were the same as those in Example 1, except that 0.1 kg of [MnⅣ2(μ-O)3(Me-TACN)2](PF6)2 was substituted for [MnⅣ2(μ-O)3(Me-TACN)2](Cl)2] in the colorant solution. Finally, 5.0 kg of bright pink TAED particles were obtained by sieving, with a product yield of 77%.

[0046] Particle Color Stability Test: 10g of each pink TAED granule prepared in Comparative Example 1, Comparative Example 2, and Examples 1-4 were weighed, labeled, and placed in a constant temperature and humidity chamber at 40°C and 75% RH for color stability testing. A colorimeter was used to analyze changes in the luminance L* value, red-green a* value, and yellow-blue b* value of the TAED granules after 0, 14, and 28 days to assess color stability. The results of the color difference analysis are shown in Table 1.

[0047] Table 1 Analysis on color stability of colored TAED particles prepared by comparison case and implementation case

[0048]

[0049]

[0050] Comparison of bleaching activation efficiency: Weigh IEC-A standard detergent base powder (sodium dodecylbenzenesulfonate -9.7wt%, C12-18 fatty alcohol ethoxylate mixture -5.2wt%, C12-20 fatty acid sodium -3.6wt%, foam inhibitor -4.5wt%, 4A molecular sieve -32.5wt%, sodium carbonate -11.8%, maleic anhydride-acrylic acid copolymer sodium salt -5.2wt%, sodium silicate -3.4wt%, CMC -1.3wt%, diethylenetriamine penta (methylene phosphonic acid) -0.8wt%, sodium sulfate -9.8wt% A cleaning solution containing 8.8g of 12.2wt% water (12.2wt%), 1g of sodium percarbonate, and 0.2g of the prepared pink TAED particles was prepared using 1L of tap water. The cleaning agent was rinsed in an RHLQ vertical detergent at a 30°C temperature for 20 minutes. Detergency tests were conducted on four standard stains: coffee, red wine, tea, and oil. The whiteness of the stains was measured before and after washing using an SC-80 whiteness meter at a wavelength of 475nm. The whiteness difference between the stains was used to evaluate the cleaning performance of the pink TAED-based cleaning solution. The rinsing test results are shown in Table 2.

[0051] Table 2 Whiteness difference △R of dirty cloth test piece before and after washing

[0052] Coffee stained cloth Red wine stained cloth Tea-stained cloth Oily cloth Standard base powder 10 4 6 8 Comparative Case 1 18 6 12 16 Comparative Case 2 20 6 13 15 Implementation Case 1 32 9 18 21 Implementation Case 2 31 8 19 23 Implementation Case 3 32 9 18 23 Implementation Case 4 35 10 22 25

[0053] By comparing the experimental data on the color stability and rinse activation efficiency of TAED particles in Tables 1 and 2, it can be found that the bright pink TAED particles are prepared by using manganese as the central atom of the coordination compound and polynitrogen heterocycles as ligands to construct a soluble manganese-transition metal coordination complex as a colorant. Not only are the appearance and color of the TAED particles very stable, which is conducive to product identification, tracking and functional indication, and effectively improves the overall aesthetics of the detergent product; but the rinsing efficiency of the fabric is also significantly improved.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pink TAED bleach activator granule, prepared by mixing TAED bleach activator, colorant, binder and other additives with water, characterized by: The colorant is a transition metal coordination compound with manganese and iron ions as central atoms and multi-toothed macrocyclic organic molecules with several donor atoms of N, NR, PR, O or S with lone pair electrons as ligands; the mass percentages of the various components are as follows: the TAED component content is 50-90wt%, the colorant component content is 0.1%-10wt%, the binder component content is 5-20wt%, the inorganic auxiliary agent component content is 0-10wt%, and the moisture content is less than 3.0%.

2. The pink TAED bleach activator granules according to claim 1, characterized in that: The colorant is a transition metal coordination compound with a trivalent or tetravalent manganese ion as a central atom and a macrocyclic molecule with a donor atom such as N, NR or O having a lone pair of electrons as a ligand.

3. The pink TAED bleach activator granules according to claim 1, characterized in that: The colorant is a transition metal coordination compound with a tetravalent manganese ion as a central atom and multi-dentate macrocyclic molecules with N and NR atoms as ligands.

4. The pink TAED bleach activator granules according to claim 1, characterized in that: The binder is a mixture of one or more fatty acids, fatty alcohol alkoxy compounds, and high molecular polymers.

5. The pink TAED bleach activator granules according to claim 1, characterized in that: The binder is a natural macromolecular material such as sodium carboxymethyl cellulose or a macromolecular material such as copolymerized polyacrylate.

6. The pink TAED bleach activator granules according to claim 1, characterized in that: The binder is sodium carboxymethyl cellulose with a substitution degree of 0.6-0.8, a viscosity of less than 15 mPa.s, a purity of ≥85%, and a pH value of 6-8, or a partially or fully neutralized sodium salt of acrylic acid-maleic anhydride copolymer with a relative molecular mass of 2000-70000 g / mol and a pH value of 4-8.

7. The pink TAED bleach activator granules according to claim 1, characterized in that: The content of the TAED component is 70-85wt%, the content of the colorant component is 1-6wt%, the content of the binder component is 8-15wt%, and the water content is lower than 1.5wt%.

8. A method for preparing pink TAED bleach activator particles, characterized in that: TAED powder, transition metal coordination compound colorant, binder, inorganic additive and water are mixed all at once or in stages, and then extruded into strips using an extruder. The shape and size of the particles are controlled by a rotary cutter in combination with a granulator, and then dried and sieved to obtain a colored TAED particle product of the target size.

9. The method for preparing pink TAED bleach activator particles according to claim 8, characterized in that: In the mixing stage, TAED powder, binder and inorganic additives are first dry-mixed in a dry mixer for 10 to 50 minutes, and then an aqueous solution containing 5 to 15 wt% of a transition metal coordination compound colorant is sprayed into a wet mixer for kneading for 10 to 60 minutes.

10. The method for preparing pink TAED bleaching activator particles according to claim 9, characterized in that: The average size of the sieved colored TAED particle product is 0.1-1.6 mm, preferably 0.2-1.2 mm, more preferably 0.3-1.0 mm.

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