High-dispersion PA color master batch and preparation method thereof

Abstract

The invention relates to the technical field of compositions of high-molecular compounds, in particular to a high-dispersion PA color master batch and a preparation method thereof. The color master batch is prepared from the following raw materials in parts by weight: 80 to 90 parts of polyamide resin, 10 to 20 parts of modified iron oxide orange, 1 to 5 parts of anthraquinone pigment, 0.5 to 1 part of antioxidant, 0.5 to 1.5 parts of light stabilizer and 1 to 5 parts of dispersing agent. The invention also provides a preparation method of the composition. Compared with the prior art, the color master batch prepared by the invention has the advantages of high dispersity, good coloring property, excellent high temperature resistance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer compound compositions, and in particular to a highly dispersed PA masterbatch and a preparation method thereof. Background Art

[0002] Polyamide masterbatch is a masterbatch designed for polyamide (PA) plastics. It needs to have some special properties to meet the requirements of polyamide materials in processing and application. Polyamide, also often called nylon, is a thermoplastic linear polymer with high strength, good heat resistance, wear resistance, chemical corrosion resistance and self-lubricating properties. The technical requirements of polyamide masterbatch are very special, the most important of which are light resistance, migration and dispersibility in the injection molding process. The special requirements of polyamide masterbatch include: heat resistance. Since the melt temperature of polyamide injection molding is high, polyamide 6 usually reaches 220°C, and polyamide 66 is as high as 260°C, so the colorant used must be able to withstand such high temperatures. Reducibility. The amide group in polyamide shows strong reducing properties when melted, which causes many organic pigments to fade during processing. Therefore, the types of pigments suitable for polyamide are quite limited. Boiling resistance. Polyamide materials are easy to absorb water. Injection molded parts usually need to be boiled in water to eliminate internal stress, which requires that the pigments used will not fade under boiling conditions. Polyamide masterbatches are widely used in the coloring of polyamide plastics, such as nylon 6, nylon 66, etc. They have shown extraordinary application value in many fields such as textiles, engineering, and automobiles.

[0003] CN103694683A discloses a masterbatch for nylon, which is composed of the following components: gray colorant, polyamide resin, composite stabilizer, dehumidifier, light-induced energy storage luminous powder, dispersant; the composite stabilizer includes at least two of hindered phenol antioxidants, phosphite antioxidants, copper halide stabilizers, hindered amine light stabilizers, anti-hydrolysis agents, benzophenones, and benzotriazole ultraviolet absorbers. Compared with the prior art, the present invention mainly adopts the compounding of multiple stabilizers to make various stabilizers produce synergistic effects, ensure the stability of the material during the processing and in long-term outdoor use, and the mechanical properties of the material are better, which is suitable for the design and application of high-end nylon products with long-term weather resistance requirements.

[0004] CN117659452A belongs to the technical field of masterbatch, specifically a polyamide masterbatch and a preparation method thereof, the preparation method comprising the following steps: S1: uniformly mixing color powder particles and a dispersant, and fully grinding them under low temperature conditions to obtain a color paste; S2: adding polyamide and a coupling agent into the color paste and stirring and mixing them at high speed to disperse the materials to obtain a mixture A; S3: placing the mixture A obtained in S3 in an air drying device for drying to obtain a dried mixture B; S4: placing the mixture B obtained in S4 in a twin-screw extruder, and utilizing the screw rotation of the twin-screw extruder to extrude and granulate the material; S5: placing the extruded particles in a cooling device for cooling to obtain the finished polyamide masterbatch, the Delta E value of the polyamide masterbatch obtained in this way is closer to 0, that is, the polyamide masterbatch obtained in this way is closer to the standard color sample and has better quality.

[0005] During the preparation of polyamide masterbatch, although the screw rotation of the twin-screw extruder can achieve a certain degree of dispersion of the pigment, the reverse process of pigment particle agglomeration will also occur, making it difficult to achieve uniform dispersion of the pigment particles; and the compatibility between the pigment particles and the polyamide resin is poor, the actual pigment content in the masterbatch fluctuates greatly, and the dyeing is uneven, which will affect the later coloring effect of the masterbatch. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a highly dispersed PA masterbatch and a preparation method thereof.

[0007] Although organic pigments are brightly colored and have good tinting power, they have relatively poor light resistance and weather resistance, and the dispersion of organic pigments in polymers may be uneven, which is prone to migration phenomena such as solvent extraction, contact migration and surface blooming, which will affect the appearance and performance of the product. Inorganic pigments have excellent anti-fading properties, better durability, and acid and alkali resistance, but inorganic pigments may be difficult to disperse evenly in the medium, resulting in uneven dyeing. The present invention uses iron oxide orange as an orange pigment for PA masterbatch, and in order to improve the dispersibility of iron oxide orange in PA, it is modified. Since iron oxide orange is an inorganic pigment mixed with iron oxide red and iron oxide yellow, iron oxide yellow, also known as hydroxyl iron oxide, contains hydroxyl groups on the surface, and the metal ions on the surface of iron oxide red are partially exposed, which can react with moisture in the environment to form hydrogen bonds, thereby generating hydroxyl groups on the surface. Therefore, the surfaces of both are very easy to absorb water, and there is usually a layer of water molecules on the periphery of the particles, so that the solid particles of the pigment form aggregates or barriers that isolate each other, resulting in poor dispersibility. Polyamide is easy to absorb water and usually needs to be boiled in water to eliminate internal stress. This requires that the pigment used will not fade under boiling conditions and cannot easily absorb water, and the thermal stability of iron oxide orange cannot currently meet the requirements of high-temperature processing of polyamide. Therefore, the present invention modifies iron oxide orange and obtains a polymer dispersant by preparing it. When the dispersant is mixed with the powder, the pH of the polymer solution is adjusted to a weak alkaline state, and the polymer is converted into an ionic dispersant. The carboxylate ions in the solution are adsorbed on the surface of the particles, making the surface of the particles negatively charged, increasing the repulsive force between the particles and improving the dispersibility of the powder. The carboxylate group acts as an anchoring group and is closely adsorbed with the iron oxide orange, and the long alkyl chain acts as a free hanging side chain to form a hydrophobic group to form a steric hindrance, preventing the pigment particles from aggregating with each other and forming a hydrophobic barrier, while aromatic rings such as benzene rings and naphthalene rings can improve thermal stability, so that the modified iron oxide orange has better high temperature resistance. Anthraquinone pigments are famous for their bright colors and high purity. Compared with the darker colors of inorganic pigments, anthraquinone pigments have more obvious absorption characteristics in the visible light band. Therefore, compounding iron oxide orange with anthraquinone pigments may improve the overall color brightness and saturation of the masterbatch, making the color performance of the finished product brighter and more vivid. Anthraquinone pigments can make up for the limitations of iron oxide orange under certain extreme high temperatures, while avoiding the decomposition of organic pigments due to high temperatures. Anthraquinone pigments themselves have good light resistance, especially good absorption of ultraviolet rays. When used in combination with iron oxide orange, a double protective layer can be formed to enhance the light stability of the masterbatch in outdoor applications or long-term exposure to ultraviolet conditions. This means that the pigment will not fade or degrade easily under long-term exposure to light. The use of modified iron oxide orange and anthraquinone pigments together in PA masterbatch can obtain a masterbatch with high dispersibility, good coloring performance and good high temperature resistance.

[0008] To achieve the above object, the present invention provides a highly dispersed PA masterbatch, comprising the following raw materials in parts by weight: 80-90 parts of polyamide resin, 10-20 parts of modified iron oxide orange, 1-5 parts of anthraquinone pigment, 0.5-1 part of antioxidant, 0.5-1.5 parts of light stabilizer and 1-5 parts of dispersant.

[0009] The preparation method of the modified iron oxide orange comprises the following steps: X1. Add 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, phenyl methacrylate, 2-naphthyl methacrylate, N-hexadecyl methacrylamide, an initiator, and trifluoromethanesulfonic acid to tetrahydrofuran, heat to 70-80° C. under an inert atmosphere, polymerize for 4-8 hours, cool to 0-5° C., remove the inert atmosphere, then add petroleum ether to produce a precipitate, filter, and dry the filter cake to obtain a polymer dispersant; X2. Disperse iron oxide orange in ethanol, add polymer dispersant, add sodium hydroxide aqueous solution to adjust the pH to 7-8, and after uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0010] Furthermore, the anthraquinone pigment is Pigment Yellow 147.

[0011] Furthermore, the initiator is methyl-2-[methyl(4-pyridine)dithiocarbonate]propionate.

[0012] Furthermore, the molar ratio of the 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, phenyl methacrylate, 2-naphthyl methacrylate, N-hexadecyl methacrylamide, initiator and trifluoromethanesulfonic acid is 1:15~25:15~25:40~50:0.1~0.3:0.1~0.3.

[0013] Furthermore, the solid-liquid ratio of the iron oxide orange to the ethanol is 1:5-10 g / mL.

[0014] Furthermore, the amount of the polymer dispersant is 5-10 wt % of the iron oxide orange.

[0015] Furthermore, the antioxidant is one of antioxidant 1010, antioxidant 1076, and antioxidant 1035.

[0016] Furthermore, the light stabilizer is a benzotriazole light stabilizer.

[0017] Furthermore, the dispersant is one of polypropylene wax, polyethylene wax and stearic acid.

[0018] A method for preparing highly dispersed PA masterbatch comprises the following steps: The modified iron oxide orange is mixed evenly with polyamide resin, antioxidant, light stabilizer and dispersant, and then extruded and granulated to obtain highly dispersed PA masterbatch.

[0019] Beneficial effects of the present invention: 1. Compared with the prior art, the pigment of the present invention is modified before being mixed with polyamide resin for extrusion granulation, and the modified pigment is then mixed with polyamide to prepare polyamide masterbatch, resulting in good compatibility between the pigment and polyamide, and the prepared masterbatch has excellent coloring effect.

[0020] 2. The present invention modifies the pigment by means of a polymer dispersant. The carboxylate in the dispersant acts as an anchoring group and is tightly adsorbed to the iron oxide orange, while the long alkyl chain acts as a freely hanging side chain and acts as a hydrophobic group to form a steric hindrance, thereby preventing the pigment particles from aggregating with each other and forming a hydrophobic barrier. Aromatic rings such as benzene rings and naphthalene rings can improve thermal stability, thereby obtaining a masterbatch with high dispersibility, good coloring performance and good high temperature resistance. DETAILED DESCRIPTION

[0021] Iron oxide orange, model: 960, Guangzhou Hongte Chemical.

[0022] Pigment Yellow 147, Model: F324234, Wuhan Lanabai Pharmaceutical Chemical.

[0023] 2-(Ethylmercaptothiocarboxymethylthio)-2-methylpropanoic acid, CAS No.: 881037-62-3.

[0024] N-hexadecylmethacrylamide, CAS number: 59447-77-7.

[0025] Methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate, CAS number: 1158958-92-9.

[0026] Polyamide resin PA6, brand: YH800, Hunan Yuehua Chemical Industry.

[0027] Polyethylene wax, Ceridust 3620, Clariant, Germany.

[0028] Example 1 A method for preparing a highly dispersed PA masterbatch comprises the following steps, measured in parts by weight: 15 parts of modified iron oxide orange are mixed evenly with 85 parts of polyamide resin PA6, 3 parts of pigment yellow 147, 1 part of antioxidant 1010, 1 part of light stabilizer UV326 and 3 parts of polyethylene wax, and then extruded and granulated to obtain highly dispersed PA masterbatch.

[0029] The preparation method of the modified iron oxide orange comprises the following steps, calculated in parts by weight: X1. Add 2.24 parts of 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, 32.4 parts of phenyl methacrylate, 42.4 parts of 2-naphthyl methacrylate, 123.6 parts of N-hexadecyl methacrylamide, 0.27 parts of methyl-2-[methyl(4-pyridine)dithiocarbonate]propionate, and 0.224 parts of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran, heat to 80° C. under an inert atmosphere, polymerize for 6 hours, cool to 0° C., remove the inert atmosphere, then add petroleum ether to produce a precipitate, filter, and dry the filter cake to obtain a polymer dispersant; X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL, add 1.2 parts of a polymer dispersant, add 0.5 mol / L sodium hydroxide aqueous solution to adjust the pH to 8, and after uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0030] Example 2 The process is basically the same as Example 1, but the amount of the polymer dispersant used is 0.9 parts.

[0031] Example 3 The process is basically the same as Example 1, but the amount of the polymer dispersant used is 1.5 parts.

[0032] Comparative Example 1 A method for preparing a highly dispersed PA masterbatch comprises the following steps, measured in parts by weight: Mix 15 parts of iron oxide orange, 85 parts of polyamide resin PA6, 1 part of antioxidant 1010, 1 part of light stabilizer UV326 and 3 parts of polyethylene wax evenly, extrude and granulate to obtain highly dispersed PA masterbatch.

[0033] Comparative Example 2 A method for preparing a highly dispersed PA masterbatch comprises the following steps, measured in parts by weight: 15 parts of modified iron oxide orange are mixed evenly with 85 parts of polyamide resin PA6, 3 parts of pigment yellow 147, 1 part of antioxidant 1010, 1 part of light stabilizer UV326 and 3 parts of polyethylene wax, and then extruded and granulated to obtain highly dispersed PA masterbatch.

[0034] The preparation method of the modified iron oxide orange comprises the following steps, calculated in parts by weight: X1. Add 2.24 parts of 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, 20 parts of methyl methacrylate, 42.4 parts of 2-naphthyl methacrylate, 123.6 parts of N-hexadecyl methacrylamide, 0.27 parts of methyl-2-[methyl(4-pyridine)dithiocarbonate]propionate, and 0.224 parts of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran, heat to 80° C. under an inert atmosphere, polymerize for 6 hours, cool to 0° C., remove the inert atmosphere, then add petroleum ether to produce a precipitate, filter, and dry the filter cake to obtain a polymer dispersant; X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL, add 1.2 parts of a polymer dispersant, add 0.5 mol / L sodium hydroxide aqueous solution to adjust the pH to 8, and after uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0035] Comparative Example 3 A method for preparing a highly dispersed PA masterbatch comprises the following steps, measured in parts by weight: 15 parts of modified iron oxide orange are mixed evenly with 85 parts of polyamide resin PA6, 3 parts of pigment yellow 147, 1 part of antioxidant 1010, 1 part of light stabilizer UV326 and 3 parts of polyethylene wax, and then extruded and granulated to obtain highly dispersed PA masterbatch.

[0036] The preparation method of the modified iron oxide orange comprises the following steps, calculated in parts by weight: X1. Add 2.24 parts of 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, 32.4 parts of phenyl methacrylate, 28.4 parts of butyl methacrylate, 123.6 parts of N-hexadecyl methacrylamide, 0.27 parts of methyl-2-[methyl(4-pyridine) dithiocarbonate] propionate, and 0.224 parts of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran, heat to 80° C. under an inert atmosphere, polymerize for 6 hours, cool to 0° C., remove the inert atmosphere, then add petroleum ether to produce a precipitate, filter, and dry the filter cake to obtain a polymer dispersant; X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL, add 1.2 parts of a polymer dispersant, add 0.5 mol / L sodium hydroxide aqueous solution to adjust the pH to 8, and after uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0037] Comparative Example 4 A method for preparing a highly dispersed PA masterbatch comprises the following steps, measured in parts by weight: 15 parts of modified iron oxide orange are mixed evenly with 85 parts of polyamide resin PA6, 3 parts of pigment yellow 147, 1 part of antioxidant 1010, 1 part of light stabilizer UV326 and 3 parts of polyethylene wax, and then extruded and granulated to obtain highly dispersed PA masterbatch.

[0038] The preparation method of the modified iron oxide orange comprises the following steps, calculated in parts by weight: X1. Add 2.24 parts of 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, 32.4 parts of phenyl methacrylate, 42.4 parts of 2-naphthyl methacrylate, 68 parts of N-(3-dimethylaminopropyl)methacrylamide, 0.27 parts of methyl-2-[methyl(4-pyridine)dithiocarbonate]propionate, and 0.224 parts of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran, heat to 80° C. under an inert atmosphere, polymerize for 6 hours, cool to 0° C., remove the inert atmosphere, then add petroleum ether to produce a precipitate, filter, and dry the filter cake to obtain a polymer dispersant; X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL, add 1.2 parts of a polymer dispersant, add 0.5 mol / L sodium hydroxide aqueous solution to adjust the pH to 8, and after uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0039] Comparative Example 5 The same as Example 1, the only difference is that Pigment Yellow 147 is not added.

[0040] Test Example 1 The masterbatches prepared in the embodiments and control examples were subjected to performance tests, and the test reports are shown in Table 1.

[0041] Table 1 Masterbatch test report

[0042]

[0043] Test Example 2 The masterbatch prepared in the embodiment and the control example was mixed with the polyamide pellets in a mass ratio of 1:8, and the mixture was mixed and blended at 200°C or 270°C to form test specimens, and the test specimens were measured with a colorimeter, and the L, a, and b values ​​were obtained using the CIE color system. The specimens injected at 200°C were placed in a UV aging test box and aged for 500 hours under the same conditions, and the L, a, and b values ​​were measured after being taken out.

[0044] Table 2 Coloring performance and temperature resistance test results of masterbatch

[0045] In the test results of the colorimeter, "L", "a", and "b" refer to the L*, a*, and b* values ​​of the standard color samples used for comparison and reference in the CIELAB color space. These values ​​define the color characteristics of the reference sample: L standard (Lightness): Indicates the brightness or lightness of the color, ranging from 0 to 100, where 0 represents black and 100 represents white. In color measurement, the L standard value helps us judge the brightness and contrast of the surface of an object, thereby evaluating its appearance quality. a standard: Indicates the red-green color, ranging from -128 to +127, where -128 represents green and +127 represents red. A standard value greater than 0 indicates that the color is biased towards red, and less than 0 indicates that the color is biased towards green. The larger the absolute value of the value, the stronger the red-green color. b standard: Indicates the yellow-blue color, and the value range is also from -128 to +127, where -128 represents blue and +127 represents yellow. A standard value greater than 0 indicates that the color is biased towards yellow, and less than 0 indicates that the color is biased towards blue. The larger the absolute value, the stronger the yellow-blue color. In actual color measurement and comparison, by using a colorimeter to measure the L, a, and b values ​​of the sample to be tested and comparing them with these standard values, the difference between the two colors, namely the ΔE value, can be calculated. The calculation formula for the ΔE value is: ΔE=√((ΔL) 2 +(Δa) 2 +(Δb) 2 ). Among them, ΔL, Δa*, and Δb are the differences between the sample to be tested and the standard sample in L, a*, and b* respectively. This ΔE value can be used to evaluate the consistency and matching degree of color.

[0046] From the data in Table 2, it can be seen that the masterbatch prepared in the embodiment has good coloring performance and better stability under high temperature and ultraviolet light, so the masterbatch prepared still has good consistency after high temperature and ultraviolet light treatment. Compared with Examples 2-3, Example 1 has little difference in coloring performance and slightly different ΔE values, which may indicate that the amount of polymer dispersant added in Example 1 is relatively optimal, so the dispersibility of iron oxide orange is achieved the best effect, thereby better maintaining the color consistency. Compared with Example 1, Control Example 1 did not modify the iron oxide orange, so not only the coloring performance is poor, but also the color consistency is significantly worse after high temperature treatment. This is because iron oxide orange, as an inorganic pigment, is not as thermally stable as organic pigments, so it needs to be modified. Compared with Example 1, the prepared polymer dispersants of Control Examples 2-3 do not have aromatic rings such as benzene rings and naphthalene rings, so the thermal stability is not as good as that of Example 1. Compared with Example 1, the prepared polymer dispersants of Control Example 4 do not have long alkyl chains and thus cannot form a good steric hindrance, and cannot form a hydrophobic barrier, so the compatibility with the polyamide resin may be not as good as that of Example 1. When the polymer dispersant prepared in Example 1 is mixed with the powder, the pH of the polymer solution is adjusted to weak alkalinity to convert the polymer into an ionic dispersant, and the carboxylate ions in the solution are adsorbed on the surface of the particles, making the surface of the particles negatively charged, increasing the repulsive force between the particles and improving the dispersibility of the powder. The carboxylate group acts as an anchoring group and is tightly adsorbed with the iron oxide orange, and the long alkyl chain acts as a freely hanging side chain to form a steric hindrance with the hydrophobic group, preventing the pigment particles from aggregating with each other and forming a hydrophobic barrier. The introduction of hydrophobic groups and amide groups also improves the compatibility with the polyamide resin, and aromatic rings such as benzene rings and naphthalene rings can improve thermal stability, so that the modified iron oxide orange has better high temperature resistance. Anthraquinone pigments have more obvious absorption characteristics in the visible light band. Therefore, compounding iron oxide orange with anthraquinone pigments may enhance the overall color vividness and saturation of the masterbatch, making the color of the finished product brighter and more vivid. Anthraquinone pigments can make up for the limitations of iron oxide orange under certain extreme high temperatures, while avoiding the decomposition of organic pigments due to excessive temperature. Anthraquinone pigments themselves have good light resistance, especially good absorption of ultraviolet rays. When used in combination with iron oxide orange, a double protective layer can be formed to enhance the light stability of the masterbatch in outdoor applications or long-term exposure to ultraviolet conditions. This means that the pigment will not fade or degrade easily when exposed to light for a long time. Therefore, Example 1 has better resistance to ultraviolet aging than Control Example 4. From the test results, it can be seen that the application of modified iron oxide orange and pigment yellow 147 to PA masterbatch can obtain a masterbatch with high dispersibility and good coloring performance.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A highly dispersed PA masterbatch, characterized in that: The invention comprises the following raw materials in parts by weight: 80-90 parts of polyamide resin, 10-20 parts of modified iron oxide orange, 1-5 parts of anthraquinone pigment, 0.5-1 parts of antioxidant, 0.5-1.5 parts of light stabilizer and 1-5 parts of dispersant.

2. The highly dispersed PA masterbatch according to claim 1, characterized in that: The preparation method of the modified iron oxide orange comprises the following steps: X1. Add 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, phenyl methacrylate, 2-naphthyl methacrylate, N-hexadecyl methacrylamide, an initiator, and trifluoromethanesulfonic acid to tetrahydrofuran, heat to 70-80° C. under an inert atmosphere, polymerize for 4-8 hours, cool to 0-5° C., remove the inert atmosphere, then add petroleum ether to produce a precipitate, filter, and dry the filter cake to obtain a polymer dispersant; X2. Disperse iron oxide orange in ethanol, add polymer dispersant, add sodium hydroxide aqueous solution to adjust the pH to 7-8, and after uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

3. The highly dispersed PA masterbatch according to claim 2, characterized in that: The initiator is methyl-2-[methyl(4-pyridine)dithiocarbonate]propionate.

4. The highly dispersed PA masterbatch according to claim 2, characterized in that: The molar ratio of the 2-(ethylmercaptothioformylthio)-2-methylpropionic acid, phenyl methacrylate, 2-naphthyl methacrylate, N-hexadecyl methacrylamide, initiator and trifluoromethanesulfonic acid is 1:15-25:15-25:40-50:0.1-0.3:0.1-0.

3.

5. The highly dispersed PA masterbatch according to claim 2, characterized in that: The solid-liquid ratio of the iron oxide orange to the ethanol is 1:5-10 g / mL.

6. The highly dispersed PA masterbatch according to claim 2, characterized in that: The amount of the polymer dispersant is 5-10 wt % of the iron oxide orange.

7. The highly dispersed PA masterbatch according to claim 1, characterized in that: The antioxidant is one of antioxidant 1010, antioxidant 1076 and antioxidant 1035; the light stabilizer is a benzotriazole light stabilizer.

8. The highly dispersed PA masterbatch according to claim 1, characterized in that: The anthraquinone pigment is Pigment Yellow 147.

9. The highly dispersed PA masterbatch according to claim 1, characterized in that: The dispersant is one of polypropylene wax, polyethylene wax and stearic acid.

10. A method for preparing a highly dispersed PA masterbatch according to any one of claims 1 to 9, characterized in that: The steps include: The modified iron oxide orange is mixed evenly with polyamide resin, anthraquinone pigment, antioxidant, light stabilizer and dispersant, and then extruded and granulated to obtain highly dispersed PA masterbatch.

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