A marble streaky color masterbatch and its preparation method

Abstract

This application relates to the technical field of marble masterbatch, and specifically discloses a marble streak masterbatch and a preparation method thereof. A marble streak masterbatch is made from raw materials including the following parts by weight: 14 - 16 parts of pigment, 60 - 70 parts of carrier resin, 2.5 - 3.5 parts of lubricant, 2 - 5 parts of flame retardant, 8 - 10 parts of modified composite fiber, and 3 - 5 parts of modified multi-walled carbon nanotube; the preparation method is: after mixing and dispersing the pigment, carrier resin, lubricant, flame retardant, modified composite fiber, and modified multi-walled carbon nanotube, put them into an extruder, and obtain the marble streak masterbatch through melt extrusion granulation. The marble streak masterbatch obtained in this application can exhibit significantly excellent stability when affected by drastic temperature changes in the environment.

Description

Technical Field

[0001] This application relates to the technical field of marble masterbatch, and more specifically, it relates to a marble flow pattern masterbatch and a preparation method thereof. Background Art

[0002] A flow pattern masterbatch is a special pigment mainly used in plastic products, which can present a unique flow pattern effect, making the surface of the product have wavy textures, thereby increasing the aesthetics and added value of the product, and forming a unique decorative effect.

[0003] Among them, the marble flow pattern masterbatch is a coloring material that can endow plastic products with a marble texture effect. Its generation principle is based on the fact that during the co-extrusion process of two incompatible resins, due to the differences in melting point and viscosity, the dispersion is uneven, resulting in a striped pattern effect, similar to the texture of natural marble or dolomite. At the same time, the marble flow pattern masterbatch is composed of three basic elements: pigments or dyes, carriers, and additives. It is an aggregate obtained by uniformly attaching an excessive amount of pigments or dyes to the resin. Its production process mainly includes mixing and dispersion and extrusion granulation. When the pigments and additives are uniformly dispersed in the carrier resin, the mixed material is further plasticized and mixed under high temperature and the shearing action of the screw.

[0004] Regarding the above related technologies, the inventor believes that the flow pattern masterbatch usually needs to have good color stability. However, when the flow pattern masterbatch is affected by drastic temperature changes in the environment, it is prone to decomposition, deterioration, and color phase shift, ultimately resulting in an obvious color difference compared with the flow pattern masterbatch in the initial state, affecting the stability of its application.

[0005] Therefore, there is an urgent need to propose a solution to solve the above technical problems. Summary of the Invention

[0006] In order to improve the stability of the marble flow pattern masterbatch when affected by drastic temperature changes in the environment, this application provides a marble flow pattern masterbatch and a preparation method thereof.

[0007] In a first aspect, this application provides a marble flow pattern masterbatch, adopting the following technical solution:

[0008] A marble flow pattern masterbatch is made from raw materials comprising the following parts by weight:

[0009] Pigment 14 - 16 parts;

[0010] Carrier resin 60 - 70 parts;

[0011] Lubricant 2.5 - 3.5 parts;

[0012] Flame retardant 2 - 5 parts;

[0013] 8 - 10 parts of modified composite fiber;

[0014] 3 - 5 parts of modified multi - walled carbon nanotubes;

[0015] The modified composite fiber is obtained by the following method:

[0016] S1. Take the polyamide chip raw material, dry it and then prepare its formic acid solution to obtain a polyamide solution; disperse the montmorillonite raw material in a DMF solvent to obtain a montmorillonite dispersion;

[0017] S2. Stir the polyamide solution in step S1, and add the montmorillonite dispersion during the stirring process. After mixing evenly, perform electrospinning to obtain the modified composite fiber;

[0018] The modified multi - walled carbon nanotubes are obtained by the following method:

[0019] Take the multi - walled carbon nanotube raw material, disperse it in water, add cetyltrimethylammonium bromide, stir while heating, and then obtain the modified multi - walled carbon nanotubes after suction filtration, washing and drying.

[0020] By adopting the above technical scheme, montmorillonite has a unique layered one - dimensional nanostructure, and both the cold - resistance and heat - resistance properties of polyamide are excellent. After compounding montmorillonite with polyamide, by utilizing the large specific surface area and small - size effect of nanoparticles, the obtained modified composite fiber can have a tightly - bound structural characteristic, and by using the complementary enhancement between montmorillonite and polyamide, when affected by drastic temperature changes, it can exhibit excellent structural stability; therefore, when applied to marble flow - pattern masterbatch under the influence of drastic temperature changes, by using the structural network formed by the anisotropy of the fiber, the internal structure stability of the marble flow - pattern masterbatch under drastic temperature changes can be significantly improved.

[0021] The modified multi - walled carbon nanotubes are obtained by surface organic modification of multi - walled carbon nanotubes. They can exhibit excellent dispersibility in the marble flow - pattern masterbatch, show excellent binding properties with other component raw materials, and through the excellent thermal conductivity of the modified multi - walled carbon nanotubes themselves, an excellent thermal conductivity regulation effect can be formed inside the marble flow - pattern masterbatch, thereby significantly reducing the easy destruction of stability caused by a large thermal energy change gradient generated under drastic temperature changes.

[0022] Meanwhile, when the modified composite fiber and the modified multi - walled carbon nanotubes are used in a compounded manner, in addition to being able to exert their own excellent functions, they also have a synergistic compounding effect, and can build a tightly - bound thermal regulation and enhancement network structure inside the marble flow - pattern masterbatch, so that the marble flow - pattern masterbatch can exhibit significantly excellent stability when affected by drastic temperature changes in the environment.

[0023] Preferably, the weight ratio of the modified composite fiber to the modified multi-walled carbon nanotube is 18:7.

[0024] By adopting the above technical solution, when the modified composite fiber and the modified multi-walled carbon nanotube with the above weight ratio are used in combination, the structure system formed by the two can be relatively uniform and form a relatively complete coverage in the marble flow pattern masterbatch, and thus can exert better effects during the application process, and finally obtain a marble flow pattern masterbatch with better quality.

[0025] Preferably, the diameter of the modified composite fiber is 300 - 500 nm.

[0026] By adopting the above technical solution, when the modified composite fiber with the above diameter is applied, it can be relatively uniformly dispersed among the raw materials, and can form a relatively uniform structure network with each other, and form a better matching system with the modified multi-walled carbon nanotube, and thus can exert better effects, and finally obtain a marble flow pattern masterbatch with better quality.

[0027] Preferably, the diameter of the modified multi-walled carbon nanotube is 10 - 30 nm, and the length is 1 - 2 μm.

[0028] By adopting the above technical solution, when the modified multi-walled carbon nanotube with the above specifications is applied, it can be uniformly dispersed in the mixing system of the marble flow pattern masterbatch, and can form a relatively uniform thermal regulation and enhancement network structure after being compounded and combined with the modified composite fiber, and the performance of this structure in thermal regulation and structure enhancement is better, significantly improving the stability of the marble flow pattern masterbatch when affected by drastic temperature changes in the environment.

[0029] Preferably, in the modified composite fiber, the weight ratio of montmorillonite to polyamide is 1:(8 - 12).

[0030] By adopting the above technical solution, when montmorillonite and polyamide with the above weight ratio are combined and applied, the obtained modified composite fiber is relatively excellent in terms of structural strength performance and temperature resistance variability, and thus can exert better effects after application, which is beneficial to obtaining a marble flow pattern masterbatch with better quality under drastic temperature changes.

[0031] Preferably, the lubricant is zinc stearate.

[0032] By adopting the above technical solutions, the lubricant can quickly wet the pigments, enabling the pigments to be evenly dispersed within the polymer, thereby effectively suppressing the re-aggregation of pigment particles, promoting particle refinement, and ensuring that the obtained marble streak masterbatch is not prone to adhesion and caking during the processing, guaranteeing the uniformity and stability of the product; and the above types of lubricants are all suitable for the preparation of marble streak masterbatch and can exert excellent and stable corresponding effects during application.

[0033] Preferably, the flame retardant is a phosphorus-based flame retardant.

[0034] By adopting the above technical solutions, the flame retardant endows the marble streak masterbatch with excellent flame retardant performance, can effectively inhibit the combustion of the material, and improves the fire safety performance of the product; and the above types of flame retardants are all suitable for the preparation of marble streak masterbatch, can be evenly dispersed among other component raw materials, and exhibit good compatibility, thereby exerting excellent and stable corresponding effects.

[0035] In a second aspect, the present application provides a method for preparing a marble streak masterbatch, adopting the following technical solutions:

[0036] A method for preparing a marble streak masterbatch includes the following steps:

[0037] (1) Prepare raw materials including pigments, carrier resin, lubricant, flame retardant, modified composite fiber, and modified multi-walled carbon nanotubes according to the ratio.

[0038] (2) After mixing and dispersing the pigments, carrier resin, lubricant, flame retardant, modified composite fiber, and modified multi-walled carbon nanotubes in step (1), put them into an extruder, and obtain the marble streak masterbatch through melt extrusion and pelletization.

[0039] By adopting the above technical solutions, the above preparation method is simple to operate, suitable for large-scale industrial production, and the raw materials are mixed and produced by the one-pot method, with high production efficiency; meanwhile, during the operation of the above preparation method, the raw materials can fully cooperate and exert excellent effects, and a marble streak masterbatch with excellent and stable quality can be obtained.

[0040] Preferably, during the melt extrusion and pelletization process in step (2), it is carried out at a feeding first zone temperature of 175 - 185 °C, a plasticizing second zone temperature of 215 - 225 °C, a homogenizing third zone temperature of 235 - 245 °C, and a final section cooling water bath temperature of 8 - 10 °C, and the screw speed is 140 - 160 rpm.

[0041] By adopting the above technical solutions, in the melt extrusion granulation process in step (2), through the cooperation of the above temperature parameters, it can be ensured that the raw material components can be fully melted and mixed, and a better cooperation effect can be exerted; and subsequently, by controlling the screw speed to obtain an appropriate shearing effect, it is helpful for the full mixing and uniform plasticization of the materials, and finally ensure that excellent quality marble streaky masterbatch is obtained. The first feeding zone is usually the position near the feeding port, and its main function is to quickly melt the raw materials so as to enter the subsequent part of the barrel; the second plasticizing zone is responsible for further improving the fluidity of the mixed materials and preparing for the flow of the mixed materials during the extrusion process; the third homogenizing zone is the area with the highest temperature, and its purpose is to ensure that the mixed materials can maintain good fluidity during extrusion, while avoiding adverse effects caused by overheating.

[0042] In summary, the present application has the following beneficial effects:

[0043] In the present application, the specially prepared modified composite fibers and modified multi-walled carbon nanotubes are used in combination in the marble streaky masterbatch. Through the synergistic combination of the two, a tightly bound thermal regulation enhancement network structure can be built inside the marble streaky masterbatch, so that the obtained marble streaky masterbatch can exhibit significantly excellent stability when affected by drastic temperature changes in the environment. Specific embodiments

[0044] The present application will be further described in detail below in combination with preparation examples, examples and comparative examples.

[0045] Except as otherwise specified, the raw materials used in the preparation examples, examples and comparative examples of the present application are all commercially available.

[0046] The pigment is selected as high-temperature resistant phthalocyanine green G, purchased from Zhengzhou Guangwang Biotechnology Co., Ltd., phthalocyanine green G type 5319;

[0047] The carrier resin is selected as low-density polyethylene, purchased from Ineos 19N930;

[0048] The lubricant is zinc stearate;

[0049] The flame retardant is purchased from Clariant halogen-free phosphorus-based flame retardant Exolit OP 950;

[0050] The polyamide chip is PA6, purchased from Sinopec Baling YH-3400;

[0051] Montmorillonite is purchased from Tuoyi New Materials (Guangzhou) Co., Ltd., with a particle size specification of 80 nm;

[0052] The multi-walled carbon nanotube raw material is purchased from Guangzhou Hongwu Materials Technology Co., Ltd.

[0053] Preparation examples of raw materials and / or intermediates

[0054] Preparation Example 1

[0055] A modified composite fiber is prepared by the following method:

[0056] S1. Take polyamide chip raw materials, dry them and then prepare their formic acid solution to obtain a polyamide solution with a mass fraction of 18%; disperse montmorillonite raw materials in a DMF solvent to obtain a montmorillonite dispersion with a mass fraction of 8%;

[0057] S2. Stir the polyamide solution in step S1, and add the montmorillonite dispersion during the stirring process. After mixing evenly, perform electrospinning to obtain the modified composite fiber.

[0058] Note: In the above-obtained modified composite fiber, the weight ratio of montmorillonite to polyamide is 1:10. The diameter of the modified composite fiber is 400 nm.

[0059] Preparation Example 2

[0060] A modified composite fiber, different from Preparation Example 1 in that the weight ratio of montmorillonite to polyamide is 1:8.

[0061] Preparation Example 3

[0062] A modified composite fiber, different from Preparation Example 1 in that the weight ratio of montmorillonite to polyamide is 1:12.

[0063] Preparation Example 4

[0064] A modified composite fiber, different from Preparation Example 1 in that the diameter of the modified composite fiber is 3008 nm.

[0065] Preparation Example 5

[0066] A modified composite fiber, different from Preparation Example 1 in that the diameter of the modified composite fiber is 8500 nm.

[0067] Preparation Example 6

[0068] A modified multi-walled carbon nanotube is prepared by the following method:

[0069] Take multi-walled carbon nanotube raw materials and disperse them in water to obtain a multi-walled carbon nanotube aqueous dispersion with a mass fraction of 5%; then add cetyltrimethylammonium bromide, and the weight ratio of cetyltrimethylammonium bromide to carbon nanotubes is 1:2. After heating to 80 °C and stirring for 4 h, perform suction filtration, washing and drying to obtain the modified multi-walled carbon nanotube.

[0070] Note: The diameter of the modified multi-walled carbon nanotube obtained by the above operation is 20 nm and the length is 1.5 μm.

[0071] Preparation Example 7

[0072] A modified multi-walled carbon nanotube, which is different from Preparation Example 6 in that the diameter of the modified multi-walled carbon nanotube is 10 nm and the length is 1 μm.

[0073] Preparation Example 8

[0074] A modified multi-walled carbon nanotube, which is different from Preparation Example 6 in that the diameter of the modified multi-walled carbon nanotube is 30 nm and the length is 2 μm.

[0075] Example 1

[0076] A marble streaky masterbatch, the raw materials required for its preparation and their corresponding weights are shown in Table 1, and it is obtained through the following steps:

[0077] (1) Prepare the raw materials including pigment, carrier resin, lubricant, flame retardant, modified composite fiber and modified multi-walled carbon nanotube according to the ratio;

[0078] (2) After mixing and dispersing the pigment, carrier resin, lubricant, flame retardant, modified composite fiber and modified multi-walled carbon nanotube in step (1), put them into an extruder, and obtain the marble streaky masterbatch through melt extrusion and pelletization.

[0079] Note: For the above operations, during the melt extrusion and pelletization process in step (2), it is carried out at a feeding first zone temperature of 180 °C, a plasticizing second zone temperature of 220 °C, a homogenizing third zone temperature of 240 °C, and a final stage cooling water bath temperature of 9 °C, and the screw speed is 150 rpm. The modified composite fiber is obtained from Preparation Example 1. The modified multi-walled carbon nanotube is obtained from Preparation Example 6.

[0080] Examples 2 - 3

[0081] A marble streaky masterbatch, which is different from Example 1 in that the raw materials required for its preparation and their corresponding weights are shown in Table 1.

[0082] Table 1 Raw materials required for the preparation of Examples 1 - 3 and their weight parts (kg / part)

[0083] Component Example 1 Example 2 Example 3 Pigment 15 14 16 Carrier resin 65 60 70 Lubricant 3 2.5 3.5 Flame retardant 3.5 2 5 Modified composite fiber 9 8 10 Modified multi-walled carbon nanotube 4 3 5

[0084] Example 4

[0085] A marble streaky masterbatch, which is different from Example 1 in that during the melt extrusion and pelletization process in step (2), it is carried out at a feeding first zone temperature of 175 °C, a plasticizing second zone temperature of 215 °C, a homogenizing third zone temperature of 235 °C, and a final stage cooling water bath temperature of 8 °C, and the screw speed is 140 rpm.

[0086] Example 5

[0087] A marble streaky masterbatch, different from Example 1, in the process of melt extrusion granulation in step (2), the feeding first zone is at 185°C, the plasticizing second zone is at 225°C, the homogenizing third zone is at 245°C, and the temperature of the final stage cooling water bath is 10°C, and the screw speed is 160 rpm.

[0088] Example 6

[0089] A marble streaky masterbatch, different from Example 1, in that the total weight parts of the modified composite fiber and the modified multi-walled carbon nanotube remain unchanged, and the weight part ratio between the two is adjusted to 18:7.

[0090] Example 7

[0091] A marble streaky masterbatch, different from Example 1, in that the modified composite fiber is obtained from Preparation Example 2.

[0092] Example 8

[0093] A marble streaky masterbatch, different from Example 1, in that the modified composite fiber is obtained from Preparation Example 3.

[0094] Example 9

[0095] A marble streaky masterbatch, different from Example 1, in that the modified composite fiber is obtained from Preparation Example 4.

[0096] Example 10

[0097] A marble streaky masterbatch, different from Example 1, in that the modified composite fiber is obtained from Preparation Example 5.

[0098] Example 11

[0099] A marble streaky masterbatch, different from Example 1, in that the modified multi-walled carbon nanotube is obtained from Preparation Example 7.

[0100] Example 12

[0101] A marble streaky masterbatch, different from Example 1, in that the modified multi-walled carbon nanotube is obtained from Preparation Example 8.

[0102] Comparative Example 1

[0103] A marble streaky masterbatch, different from Example 1, in that the modified composite fiber is not used in the raw materials.

[0104] Comparative Example 2

[0105] A marble streaky masterbatch, different from Example 1, in that the modified multi-walled carbon nanotube is not used in the raw materials.

[0106] Comparative Example 3

[0107] A marble flow pattern masterbatch, which is different from that of Example 1 in that modified composite fibers and modified multi-walled carbon nanotubes are not used in the raw materials.

[0108] Comparative Example 4

[0109] A marble flow pattern masterbatch, which is different from that of Example 1 in that the modified composite fibers are replaced with polyamide fibers of the same specification in equal mass.

[0110] Comparative Example 5

[0111] A marble flow pattern masterbatch, which is different from that of Example 1 in that the modified multi-walled carbon nanotubes are replaced with multi-walled carbon nanotube raw materials in equal mass.

[0112] Performance detection test

[0113] Test samples: The marble flow pattern masterbatches obtained in Examples 1-12 were used as test samples 1-12, and the marble flow pattern masterbatches obtained in Comparative Examples 1-5 were used as control samples 1-5.

[0114] Test method: Place the marble flow pattern masterbatch in a high and low temperature alternating test chamber. The initial temperature is 25 °C. First, heat it to 120 °C at a rate of 2 °C / min, then cool it to -40 °C at a rate of 1.5 °C / min, and then heat it to 25 °C at a rate of 1 °C / min, which is recorded as 1 cycle. After continuously performing 20 cycles, the treated marble flow pattern masterbatch is obtained; then, the treated marble flow pattern masterbatch and the marble flow pattern masterbatch in the initial state are detected for color difference values using a DS-200 precision color difference meter, and the detection is performed four times, and the average value of the measured color difference values is recorded as the average color difference (ΔE). The larger the average color difference (ΔE), the worse the stability of the marble flow pattern masterbatch when affected by drastic temperature changes in the environment.

[0115] After the above tests were sequentially completed for test samples 1-12 and control samples 1-5, the corresponding results were recorded in Table 2.

[0116] Table 2 Test results of test samples 1-12 and control samples 1-5

[0117] Sample Average color difference (ΔE) Test sample 1 0.21 Test sample 2 0.28 Test sample 3 0.27 Test sample 4 0.30 Test sample 5 0.25 Test sample 6 0.18 Test sample 7 0.26 Test sample 8 0.31 Test sample 9 0.29 Test sample 10 0.32 Test sample 11 0.24 Test sample 12 0.23 Control sample 1 1.15 Control sample 2 1.08 Control sample 3 1.76 Control sample 4 0.62 Control sample 5 0.51

[0118] Combined with Example 1 and Comparative Examples 1-3 and Table 2, it can be seen that by compounding and using the specially prepared modified composite fiber and modified multi-walled carbon nanotubes in the marble streaky masterbatch, the stability of the marble streaky masterbatch under the influence of drastic temperature changes in the environment can be significantly improved, and the average color difference measured by the above tests is significantly reduced. If the modified composite fiber or modified multi-walled carbon nanotubes are used alone, although the corresponding effects can be improved to a certain extent, and the average color difference measured by the test is reduced to a certain extent, the reduction amplitude is limited, and the sum of the effects brought by the two used alone is far less excellent than the compounding of the two. Thus, it can be seen that the combination between the modified composite fiber and the modified multi-walled carbon nanotubes can bring a significant corresponding effect of 1+1>2 in the marble streaky masterbatch. Combined with Examples 4-5 and Table 2, it can be seen that if the modified composite fiber is replaced with polyamide fiber of the same specification in equal mass, or the modified multi-walled carbon nanotubes are replaced with multi-walled carbon nanotube raw materials in equal mass, the corresponding effects will all show obvious losses, and the corresponding compounding synergistic effect cannot be exerted.

[0119] Combined with Example 1 and Examples 4-5 and Table 2, it can be seen that in the melt extrusion granulation process in step (2), the feeding first zone is 175-185°C, the plasticizing second zone is 215-225°C, the homogenizing third zone is 235-245°C, and the final stage cooling water bath temperature is 8-10°C, and the screw speed is 140-160 rpm, which can ultimately ensure that the marble streaky masterbatch with excellent quality is obtained.

[0120] Combined with Examples 1-3 and Example 6 and Table 2, it can be seen that when the weight ratio of the modified composite fiber to the modified multi-walled carbon nanotubes is 18:7, it can play a better role effect during application, and finally obtain a marble streaky masterbatch with better quality, and the average color difference measured by the test is significantly lower.

[0121] Combined with Example 1 and Examples 7-10 and Table 2, it can be seen that in the modified composite fiber, when the weight ratio of montmorillonite to polyamide is 1:(8-12), and the diameter of the modified composite fiber is 300-500 nm, it can form a better cooperation system with the modified multi-walled carbon nanotubes during the application process and play a better role effect, and finally obtain a marble streaky masterbatch with better quality.

[0122] Combined with Example 1 and Examples 11-12 and Table 2, it can be seen that when the diameter of the modified multi-walled carbon nanotubes is 10-30 nm and the length is 1-2 μm, the marble streaky masterbatch can show excellent stability under the influence of drastic temperature changes in the environment.

[0123] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A marble streaky color masterbatch, characterized in that, It is made from raw materials comprising the following parts by weight: Pigment 14 - 16 parts; Carrier resin 60 - 70 parts; Lubricant 2.5 - 3.5 parts; Flame retardant 2 - 5 parts; Modified composite fiber 8 - 10 parts; Modified multi - walled carbon nanotube 3 - 5 parts; The modified composite fiber is obtained by the following method: S1. Take polyamide chip raw materials, dry them and then prepare its formic acid solution to obtain a polyamide solution; Disperse montmorillonite raw materials in a DMF solvent to obtain a montmorillonite dispersion; S2. Stir the polyamide solution in step S1, and add the montmorillonite dispersion during the stirring process. After mixing evenly, perform electrospinning to obtain the modified composite fiber; The modified multi - walled carbon nanotube is obtained by the following method: Take multi - walled carbon nanotube raw materials, disperse them in water, add cetyltrimethylammonium bromide, stir while heating, and after filtration, washing and drying, obtain the modified multi - walled carbon nanotube; The weight ratio of the modified composite fiber to the modified multi - walled carbon nanotube is 18:7; The diameter of the modified composite fiber is 300 - 500 nm; The diameter of the modified multi - walled carbon nanotube is 10 - 30 nm, and the length is 1 - 2 μm; In the modified composite fiber, the weight ratio of montmorillonite to polyamide is 1:(8 - 12).

2. The marble streaky color masterbatch according to claim 1, characterized in that: The lubricant is zinc stearate.

3. The marble streaky color masterbatch according to claim 1, characterized in that: The flame retardant is a phosphorus - based flame retardant.

4. The preparation method of the marble streaky color masterbatch according to claim 1, characterized in that: It includes the following steps: (1) Prepare raw materials comprising pigment, carrier resin, lubricant, flame retardant, modified composite fiber and modified multi - walled carbon nanotube according to the ratio; (2) After mixing and dispersing the pigment, carrier resin, lubricant, flame retardant, modified composite fiber and modified multi - walled carbon nanotube in step (1), put them into an extruder and perform melt extrusion granulation to obtain a marble - streaked color masterbatch.

5. The preparation method of the marble streaky color masterbatch according to claim 4, characterized in that: During the melt extrusion granulation process in step (2), it is carried out at a feeding first zone temperature of 175 - 185 °C, a plasticizing second zone temperature of 215 - 225 °C, a homogenizing third zone temperature of 235 - 245 °C, and a final section cooling water bath temperature of 8 - 10 °C, and the screw speed is 140 - 160 rpm.