High-dispersion PA masterbatch and its preparation method

Abstract

The present invention relates to the technical field of compositions of high molecular compounds, and particularly relates to a highly dispersed PA masterbatch and a preparation method thereof. The masterbatch 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 part of antioxidant, 0.5-1.5 parts of light stabilizer, and 1-5 parts of dispersant. The present invention also provides a preparation method thereof. Compared with the prior art, the masterbatch prepared by the present invention has the advantages of high dispersibility, good coloring performance, excellent high temperature resistance, etc.

Description

Technical Field

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

[0002] Polyamide masterbatch is designed specifically for polyamide (PA) plastics and needs to possess some special properties to meet the requirements of polyamide materials in processing and applications. Polyamide, also commonly known as nylon, is a thermoplastic linear polymer with high strength, good heat resistance, wear resistance, chemical corrosion resistance, and self-lubricating properties. The technical requirements for polyamide masterbatch are very special, and the most important ones are light resistance, migration, and dispersibility in the injection molding process. The special requirements for polyamide masterbatch include: heat resistance. Since the melt temperature during polyamide injection molding is relatively high, polyamide 6 usually reaches 220°C, while polyamide 66 is even as high as 260°C. Therefore, the colorants used must be able to withstand such high temperatures. Reducing property. The amide groups in polyamide show strong reducing properties during melting, which causes many organic pigments to fade during the processing. Therefore, the types of pigments suitable for polyamide are quite limited. Boiling water resistance. Polyamide materials are prone to absorbing water, and injection-molded parts usually need to be treated with boiling water to eliminate internal stress. This requires that the pigments used do not fade under boiling water conditions. Polyamide masterbatch is widely used in the coloring of polyamide plastics, such as nylon 6, nylon 66, etc., and they have demonstrated extraordinary application value in multiple 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, moisture remover, photoluminescent powder, dispersant; the composite stabilizer includes at least two of hindered phenol antioxidants, phosphite antioxidants, copper halide stabilizers, hindered amine light stabilizers, hydrolysis inhibitors, benzophenones, and benzotriazole ultraviolet absorbers. Compared with the prior art, the present invention mainly uses the compounding of multiple stabilizers to enable various stabilizers to produce a synergistic effect, ensuring the stability of the material during processing and 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 its preparation method. The preparation method includes the following steps: S1: Uniformly mix color powder particles and a dispersant, and conduct sufficient grinding under low-temperature conditions to obtain a color paste; S2: Put polyamide and a coupling agent into the color paste and carry out high-speed stirring and mixing to disperse the materials and obtain mixture A; S3: Place the mixture A obtained in S3 into a drying device for drying to obtain dried mixture B; S4: Put the mixture B obtained in S4 into a twin-screw extruder, and use the rotation of the screws of the twin-screw extruder to extrude and granulate the materials; S5: Place the extruded particles into 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 process of the polyamide masterbatch, although the rotation of the screws of the twin-screw extruder can achieve a certain degree of dispersion of the pigment, at the same time, there will also be an inverse process of agglomeration of the pigment particles, 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 its preparation method.

[0007] Although organic pigments are bright in color and have good coloring power, their lightfastness and weather resistance are relatively poor. Moreover, the dispersion of organic pigments in polymers may be uneven, prone to migration phenomena such as solvent extraction, contact migration, and surface blooming, which will affect the appearance and performance of products. Inorganic pigments, on the other hand, have excellent anti-fading properties, better durability, and are also resistant to acid and alkali. However, inorganic pigments may be more difficult to disperse evenly in the medium, resulting in uneven dyeing. In the present invention, iron oxide orange is used as an orange pigment in PA masterbatch. In order to improve the dispersibility of iron oxide orange in PA, it is modified. Since iron oxide orange is an inorganic pigment composed of a blend of iron oxide red and iron oxide yellow, and iron oxide yellow, also known as iron hydroxide, has hydroxyl groups on its surface, and some of the metal ions on the surface of iron oxide red are exposed and can react with moisture in the environment to form hydrogen bonds, thus generating hydroxyl groups on the surface. Therefore, both of them are extremely prone to absorb water on the surface. Usually, there is a layer of water molecules around the particles, causing the solid particles of the pigment to form aggregates or mutually isolated barriers, resulting in poor dispersibility. Polyamide is easy to absorb water and usually needs to be treated by boiling water to eliminate internal stress. This requires that the pigments used do not fade under boiling water conditions, are not easy to absorb water, and the current thermal stability of iron oxide orange cannot meet the requirements of high-temperature processing of polyamide. Therefore, in the present invention, iron oxide orange is modified by preparing a polymer dispersant. When the dispersant is mixed with the powder, the pH of the polymer solution is adjusted to weakly alkaline, and the polymer is converted into an ionic dispersant. The carboxylate ions in the solution are adsorbed on the particle surface, making the particle surface negatively charged, increasing the repulsive force between particles and improving the dispersibility of the powder. The carboxylate group acts as an anchoring group and tightly adsorbs to iron oxide orange, while the long alkyl chain acts as a freely hanging side chain to form a steric hindrance as a hydrophobic group, 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 the 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 relatively dull colors of inorganic pigments, the absorption characteristics of anthraquinone pigments in the visible light band are more obvious. 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 more bright and vivid. Anthraquinone pigments can make up for the limitations of iron oxide orange at certain extremely high temperatures and avoid the decomposition of organic pigments due to excessive temperature. Anthraquinone pigments themselves have good lightfastness, especially good ultraviolet absorption performance. When used in combination with iron oxide orange, a double protective layer can be formed, enhancing the light stability of the masterbatch under outdoor applications or long-term exposure to ultraviolet conditions. This means that the pigments will not fade or degrade easily when exposed to light for a long time. Applying the 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, which 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 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:

[0010] X1. Add 2-(ethyl mercaptothiocarbonylthio)-2-methylpropionic acid, phenyl methacrylate, 2-naphthyl methacrylate, N-hexadecyl methacrylamide, initiator, and trifluoromethanesulfonic acid into tetrahydrofuran. After heating to 70-80 °C in an inert atmosphere and polymerizing for 4-8 h, cool to 0-5 °C, remove the inert atmosphere, and then add it to petroleum ether to produce precipitation. Filter, and the filter cake is dried to obtain a polymer dispersant.

[0011] X2. Disperse iron oxide orange in ethanol, add the polymer dispersant, add an aqueous sodium hydroxide solution to adjust the pH to 7-8. After dispersing evenly, filter, and the filter cake is dried to obtain the modified iron oxide orange.

[0012] Further, the anthraquinone pigment is pigment yellow 147.

[0013] Further, the initiator is methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate.

[0014] Further, the molar ratio of 2-(ethyl mercaptothiocarbonylthio)-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.

[0015] Further, the solid-liquid ratio of iron oxide orange to ethanol is 1:5-10 g / mL.

[0016] Further, the amount of the polymer dispersant is 5-10 wt% of iron oxide orange.

[0017] Further, the antioxidant is one of antioxidant 1010, antioxidant 1076, and antioxidant 1035.

[0018] Further, the light stabilizer is a benzotriazole light stabilizer.

[0019] Further, the dispersant is one of polypropylene wax, polyethylene wax, and stearic acid.

[0020] A preparation method of a highly dispersed PA masterbatch comprises the following steps:

[0021] After uniformly mixing the modified iron oxide orange with polyamide resin, antioxidant, light stabilizer and dispersant, extruding and granulating, a highly dispersed PA masterbatch is obtained.

[0022] Advantages of the present invention:

[0023] 1. Compared with the prior art, before the pigment of the present invention is mixed and extruded with polyamide resin for granulation, the pigment is first modified, and the modified pigment is then mixed with polyamide to prepare a polyamide masterbatch, resulting in good compatibility between the pigment and polyamide, and the prepared masterbatch has excellent coloring effect.

[0024] 2. The present invention modifies the pigment through a polymer dispersant. The carboxylate group in the dispersant is tightly adsorbed to iron oxide orange as an anchoring group, while the long alkyl chain acts as a free-hanging side chain to form a steric hindrance of the hydrophobic group, preventing the pigment particles from aggregating with each other, and forming a hydrophobic barrier. The aromatic rings such as benzene rings and naphthalene rings can improve the thermal stability, thus obtaining a masterbatch with high dispersibility, good coloring performance and good high-temperature resistance. Specific embodiments

[0025] Iron oxide orange, model: 960, Guangzhou Hongte Chemical Industry.

[0026] Pigment Yellow 147, model: F324234, Wuhan Lana White Pharmaceutical and Chemical Industry.

[0027] 2-(ethylmercaptothiocarbonothioylthio)-2-methylpropanoic acid, CAS No.: 881037-62-3.

[0028] N-hexadecylmethacrylamide, CAS No.: 59447-77-7.

[0029] Methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate, CAS No.: 1158958-92-9.

[0030] Polyamide resin PA6, grade: YH800, Hunan Yuehua Chemical Industry.

[0031] Polyethylene wax, Ceridust 3620, Clariant, Germany.

[0032] Example 1

[0033] A preparation method of a highly dispersed PA masterbatch includes the following steps, in parts by weight:

[0034] Mix 15 parts of modified iron oxide orange, 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 evenly, then extrude and granulate to obtain a highly dispersed PA masterbatch.

[0035] The preparation method of the modified iron oxide orange includes the following steps, in parts by weight:

[0036] X1. Add 2.24 parts of 2-(ethylmercaptothiocarbonothioylthio)-2-methylpropanoic acid, 32.4 parts of phenyl methacrylate, 42.4 parts of 2-naphthyl methacrylate, 123.6 parts of N-hexadecylmethacrylamide, 0.27 part of methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate, and 0.224 part of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran. After heating to 80 °C in an inert atmosphere and polymerizing for 6 h, cool to 0 °C, remove the inert atmosphere, and then add it to petroleum ether to produce precipitation. Filter, and the filter cake is dried to obtain a polymer dispersant;

[0037] X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL, then add 1.2 parts of the polymer dispersant, add 0.5 mol / L sodium hydroxide aqueous solution to adjust the pH to 8, disperse evenly, filter, and dry the filter cake to obtain the modified iron oxide orange.

[0038] Example 2

[0039] It is basically the same as Example 1, but the usage amount of the polymer dispersant is 0.9 part.

[0040] Example 3

[0041] It is basically the same as Example 1, but the usage amount of the polymer dispersant is 1.5 parts.

[0042] Control Example 1

[0043] A preparation method of a highly dispersed PA masterbatch includes the following steps, in parts by weight:

[0044] 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, then extrude and granulate to obtain a highly dispersed PA masterbatch.

[0045] Control Example 2

[0046] A preparation method of a highly dispersed PA masterbatch includes the following steps, in parts by weight:

[0047] Mix 15 parts of modified iron oxide orange, 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 evenly, then extrude and pelletize to obtain a highly dispersed PA masterbatch.

[0048] The preparation method of the modified iron oxide orange includes the following steps, in parts by weight:

[0049] X1. Add 2.24 parts of 2-(ethylmercaptothiocarbonothioylthio)-2-methylpropanoic acid, 20 parts of methyl methacrylate, 42.4 parts of 2-naphthyl methacrylate, 123.6 parts of N-hexadecylmethacrylamide, 0.27 part of methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate, and 0.224 part of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran. After heating to 80 °C in an inert atmosphere and polymerizing for 6 h, cool to 0 °C, remove the inert atmosphere, then add it to petroleum ether to produce precipitation, filter, and dry the filter cake to obtain a polymer dispersant;

[0050] 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 the polymer dispersant, adjust the pH to 8 with 0.5 mol / L sodium hydroxide aqueous solution, disperse evenly, filter, and dry the filter cake to obtain the modified iron oxide orange.

[0051] Control Example 3

[0052] A preparation method of a highly dispersed PA masterbatch includes the following steps, in parts by weight:

[0053] Mix 15 parts of modified iron oxide orange, 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 evenly, then extrude and pelletize to obtain a highly dispersed PA masterbatch.

[0054] The preparation method of the modified iron oxide orange includes the following steps, in parts by weight:

[0055] X1. Add 2.24 parts of 2-(ethylmercaptothiocarbonothioylthio)-2-methylpropanoic acid, 32.4 parts of phenyl methacrylate, 28.4 parts of butyl methacrylate, 123.6 parts of N-hexadecylmethacrylamide, 0.27 part of methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate, and 0.224 part of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran. After heating to 80 °C in an inert atmosphere and polymerizing for 6 h, cool to 0 °C, remove the inert atmosphere, then add it to petroleum ether to produce precipitation, filter, and dry the filter cake to obtain a polymer dispersant;

[0056] X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL. Then add 1.2 parts of polymer dispersant and adjust the pH to 8 with 0.5 mol / L sodium hydroxide aqueous solution. After uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0057] Comparative Example 4

[0058] A preparation method of highly dispersed PA masterbatch, comprising the following steps, in parts by weight:

[0059] Mix 15 parts of modified iron oxide orange, 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 uniformly, then extrude and pelletize to obtain highly dispersed PA masterbatch.

[0060] The preparation method of the modified iron oxide orange comprises the following steps, in parts by weight:

[0061] X1. Add 2.24 parts of 2-(ethylmercaptothiocarbonothioylthio)-2-methylpropanoic acid, 32.4 parts of phenyl methacrylate, 42.4 parts of 2-naphthyl methacrylate, 68 parts of N-(3-dimethylaminopropyl)methacrylamide, 0.27 part of methyl-2-[methyl(4-pyridyl)dithiocarbonate]propionate, and 0.224 part of trifluoromethanesulfonic acid to 1500 parts of tetrahydrofuran. After heating to 80 °C in an inert atmosphere and polymerizing for 6 h, cool to 0 °C, remove the inert atmosphere, and then add it to petroleum ether to produce precipitation. Filter and dry the filter cake to obtain the polymer dispersant;

[0062] X2. Disperse 15 parts of iron oxide orange in ethanol with a solid-liquid ratio of 1:5 g / mL. Then add 1.2 parts of polymer dispersant and adjust the pH to 8 with 0.5 mol / L sodium hydroxide aqueous solution. After uniform dispersion, filter and dry the filter cake to obtain modified iron oxide orange.

[0063] Comparative Example 5

[0064] Basically the same as Example 1, the only difference is that pigment yellow 147 is not added.

[0065] Test Example 1

[0066] Conduct performance tests on the masterbatches prepared in the examples and comparative examples, and the test reports are shown in Table 1.

[0067] Table 1 Masterbatch Test Report

[0068]

[0069]

[0070] Test Example 2

[0071] The masterbatch prepared in the examples and comparative examples was mixed with polyamide pellets at a mass ratio of 1:8, and the mixture was injection-molded into test specimens at 200 °C or 270 °C. The test specimens were measured with a color difference meter, and the L, a, and b values were obtained using the CIE color system. The specimens injection-molded at 200 °C were placed in an ultraviolet aging test chamber and aged for 500 h under the same conditions, and then the L, a, and b values were measured after removal.

[0072] Table 2 Test results of the coloring performance and heat resistance of the masterbatch

[0073]

[0074] In the test results of the color difference meter, "L", "a", and "b" refer to the L*, a*, and b* values of the standard color sample for comparison in the CIELAB color space. These values define the color characteristics of the reference sample: L standard (Lightness): represents the brightness or lightness of the color, with a value range 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 object surface, thereby evaluating its appearance quality. a standard: represents the red-green chromaticity of the color, with a value range from -128 to +127, where -128 represents green and +127 represents red. An 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 number, the stronger the red-green degree of the color. b standard: represents the yellow-blue chromaticity of the color, also with a value range from -128 to +127, where -128 represents blue and +127 represents yellow. A b 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 of the number, the stronger the yellow-blue degree of the color. In actual color measurement and comparison, by measuring the L, a, and b values of the sample to be measured with a color difference meter and comparing them with these standard values, the degree of difference between the two colors, that is, the ΔE value, can be calculated. The calculation formula for the ΔE value is: ΔE = √((ΔL) 2 +(Δa) 2 +(Δb) 2 ). Where ΔL, Δa*, and Δb are the differences between the sample to be measured and the standard sample in L, a*, and b*, respectively. This ΔE value can be used to evaluate the color consistency and matching degree.

[0075] As can be seen from the data in Table 2, the masterbatch prepared in the examples has good coloring performance and better stability under high temperature and ultraviolet light. Therefore, the prepared masterbatch still has good consistency after high temperature and ultraviolet treatment. Compared with Examples 2-3, there is little difference in the coloring performance of Example 1, and there is a slight difference in the ΔE value. This may indicate that the addition amount of the polymer dispersant in Example 1 is relatively optimal. Therefore, the dispersibility of iron oxide orange reaches the best effect, so that the color consistency can be better maintained. Compared with Example 1, in Comparative Example 1, iron oxide orange was not modified. Therefore, not only the coloring performance is poor, but also the color consistency after high temperature treatment is significantly worse. This is because iron oxide orange, as an inorganic pigment, has lower thermal stability than organic pigments. Therefore, modification treatment is required. Compared with Example 1, in Comparative Examples 2-3, the prepared polymer dispersant does not have aromatic rings such as benzene rings and naphthalene rings. Therefore, the thermal stability is inferior to that of Example 1. Compared with Example 1, in Comparative Example 4, the prepared polymer dispersant does not have long alkyl chains, so it cannot form a good steric hindrance effect and cannot form a hydrophobic barrier. Therefore, the compatibility with polyamide resin may be inferior to that of Example 1. For the polymer dispersant prepared in Example 1, when mixed with the powder, the pH of the polymer solution is adjusted to weakly alkaline, and the polymer is converted into an ionic dispersant. The carboxylate ions in the solution are adsorbed on the particle surface, making the particle surface negatively charged, increasing the repulsive force between particles and improving the dispersibility of the powder. The carboxylate group acts as an anchoring group and tightly adsorbs to iron oxide orange, while the long alkyl chain acts as a freely hanging side chain to form a steric hindrance of the hydrophobic group, preventing the pigment particles from aggregating with each other, and forming a hydrophobic barrier. In addition, the introduction of hydrophobic groups and amide groups also improves the compatibility with polyamide resin, and aromatic rings such as benzene rings and naphthalene rings can improve the thermal stability, so that the modified iron oxide orange has better high temperature resistance. The absorption characteristics of anthraquinone pigments in the visible light band are more obvious. 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 at certain extremely high temperatures, while avoiding the decomposition of organic pigments due to excessive temperature. Anthraquinone pigments themselves have good light resistance, especially good ultraviolet absorption performance. When used in combination with iron oxide orange, a double protective layer can be formed, enhancing the light stability of the masterbatch under outdoor applications or long-term exposure to ultraviolet light. This means that the pigment will not fade or degrade easily when exposed to light for a long time. Therefore, Example 1 has better ultraviolet aging resistance than Comparative Example 4. From the test results, it can be seen that applying modified iron oxide orange and Pigment Yellow 147 to PA masterbatch can obtain a masterbatch with high dispersibility and good coloring performance.

[0076] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. A highly dispersed PA masterbatch, characterized in that: The method 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; 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.

2. The highly dispersed PA masterbatch according to claim 1, characterized in that: The initiator is methyl-2-[methyl(4-pyridine)dithiocarbonate]propionate.

3. The highly dispersed PA masterbatch according to claim 1, 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.

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

5. The highly dispersed PA masterbatch according to claim 1, characterized in that: The amount of the polymer dispersant is 5-10 wt % of the iron oxide orange.

6. 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.

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

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

9. A method for preparing a highly dispersed PA masterbatch according to any one of claims 1 to 8, 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.

10. The method for preparing highly dispersed PA masterbatch according to claim 9, characterized in that: The method comprises the following steps, in parts by weight: 15 parts of modified iron oxide orange, 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 were mixed evenly, extruded and granulated to obtain highly dispersed PA masterbatch; 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.

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