Color master batch composition, preparation method thereof and corresponding polyolefin product

Abstract

The invention relates to a polymer, a color master batch composition and a corresponding polyolefin product. By designing and synthesizing an alternating copolymer of maleic anhydride and a vinyl monomer, a polar succinic anhydride chain segment and a non-polar long-carbon alkyl chain segment are alternately formed on a main chain of the alternating copolymer, so that the steric hindrance effect of the polymer and the dispersion and coating effects on the pigment are further improved. The alternating copolymer of maleic anhydride and a vinyl monomer and low-molecular-weight polyethylene wax are used as dispersing agents to be applied to the color master batch composition, the dispersing performance and the anti-aging effect on pigments can be improved, and finally prepared polyolefin products are lower in color difference, more stable in coloring performance and better in ultraviolet aging resistance. Meanwhile, a light component byproduct alpha olefin dimer generated in the alpha olefin coordination polymerization process is also utilized, the application field of the low-molecular-weight poly alpha olefin is expanded, and the economic value of the low-molecular-weight poly alpha olefin is improved.

Description

Technical Field

[0001] The present invention belongs to the technical fields of polymer dispersant synthesis and masterbatch formulation, and particularly relates to a polymer, a masterbatch composition, a preparation method thereof, and a corresponding polyolefin product. Background Art

[0002] Currently, the method of using masterbatch to color polyolefin products is the most common. A masterbatch refers to an aggregate prepared by uniformly attaching an ultra-constant amount of pigment to a thermoplastic resin through a special method, also known as a pigment concentrate, which is a high-efficiency colorant dedicated to a new type of polymer material. The primary condition for the application of masterbatch in plastic products is to enable the pigment to be uniformly dispersed in the plastic, thereby endowing the plastic with rich colors without affecting other properties of the plastic products. Poor dispersion of the pigment in the carrier resin easily causes miscellaneous color spots or streaks on the surface of polyolefin products, thus affecting the appearance gloss and transparency of polyolefin products.

[0003] The prerequisite for improving the strength, transparency, and brightness of plastic products and enhancing the utilization rate of pigments is to improve the dispersion of pigments in the masterbatch and reduce the average particle size of pigments. Among them, whether the pigment can achieve the best dispersion effect in the carrier resin of the masterbatch mainly depends on three factors: the characteristics of the pigment itself, efficient processing equipment, or an efficient dispersant.

[0004] Regardless of the selection of the processing technology method of the masterbatch, the characteristics of the dispersant used in the formula play a decisive role in the dispersion effect of the pigment. In the processing stage of the masterbatch, the dispersant penetrates into the voids and holes in the pigment agglomerates, reduces the surface tension and mutual attraction of the particles, and efficiently transfers the shear force of the equipment, thereby effectively opening the agglomerated pigment particles. In addition, the dispersant also coats the pigment particles, and uses charge repulsion, steric hindrance, or entropy effect to prevent the refined pigment particles from agglomerating again, thereby exerting its stabilizing effect. The addition of the dispersant can also accelerate the wetting between the polymer and the pigment, reduce the surface tension between the polymer and the pigment, increase their affinity, improve the compatibility between the pigment and the carrier resin, and the dispersant can also improve the fluidity and processing performance of the masterbatch.

[0005] Amphiphilic polymers are usually used as dispersants for masterbatch. The amphiphilic copolymer contains molecular segments with significantly different properties (such as hydrophilicity, lipophilicity, complexing ability, etc.), which can increase the compatibility of pigment molecules with large polarity differences in the carrier resin. The current prior art US8153731 mentions the preparation of comb polymers by reacting styrene-maleic anhydride copolymers with primary amino-terminated polyalkylene oxides used as wetting agents and / or dispersants. US4755563 proposes the use of block copolymer dispersants containing ionic moieties, where the block copolymers are prepared by group transfer polymerization technology and can be used as pigment dispersants. As a dispersant, such block copolymers lack long carbon chain hydrocarbon groups, which can play a role in dispersing pigment particles, but their steric hindrance effect is not prominent enough, and the improvement of the weather resistance of polyolefin products is limited.

[0006] On the other hand, the commercial compatibilizers PE-g-MAH, PP-g-MAH, and POE-g-MAH are all grafted with the polar monomer maleic anhydride on non-polar polyethylene, polypropylene, or ethylene-octene copolymer. However, the distribution of polar monomers is uneven, and there is a lack of regularly distributed long carbon chains to provide a steric hindrance effect to maintain dispersion stability. Even for POE-g-MAH containing long carbon chain lipophilic hydrocarbon groups, their distribution on the molecular chain is irregular, resulting in a reduced effect on pigments when used as a dispersant in masterbatch and failing to exert the steric hindrance effect of long chain hydrocarbon groups.

[0007] Therefore, the weather resistance and color difference of polyolefin products prepared from current masterbatch are difficult to meet market demands, and there is an urgent need for polymer dispersants that can increase the compatibility between pigments and carrier resins, as well as masterbatch compositions with better pigment dispersibility and weather resistance. Summary of the Invention

[0008] Aiming at the defects of the prior art, the present invention designs and synthesizes a copolymer of maleic anhydride and donor vinyl monomers, alternately forming polar succinic anhydride segments and non-polar hydrocarbon segments. When this copolymer is combined with low molecular weight polyethylene wax as a dispersant for masterbatch compositions, it can more effectively exert the steric hindrance effect, improve the dispersion effect on pigment particles, and also have a stronger shielding effect on pigment particles. After ultraviolet light irradiation aging, the polyolefin products have a lower color difference.

[0009] To achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0010] In the first aspect, a polymer, the molecular segments of the polymer include at least one or a combination of two of the following structures:

[0011] Or

[0012] Preferably, the molecular segments of the polymer include the following structure:

[0013] Among them, n is a positive integer greater than or equal to 1, and R 1 is a straight-chain alkane with 4 to 18 carbon atoms, and R 2 is a straight-chain alkane with 6 to 20 carbon atoms. Preferably, R 1 is a straight-chain alkane with 4 to 8 carbon atoms, and R 2 is a straight-chain alkane with 10 to 20 carbon atoms.

[0014] Preferably, the polymer includes at least one or a combination of the following molecular chain segments:

[0015] Furthermore, the weight-average molecular weight of the polymer is not less than 5000, and the number-average molecular weight is not less than 1500.

[0016] In a second aspect, a method for preparing the above-mentioned polymer includes: performing free radical polymerization on maleic anhydride and an α-olefin dimer to obtain a maleic anhydride-α-olefin dimer copolymer; or, reacting a straight-chain alkyl primary amine with the maleic anhydride-α-olefin dimer copolymer to obtain an N-alkyl maleamide-α-olefin dimer copolymer.

[0017] Among them, an initiator is used in the free radical polymerization, and the initiator includes: one or a combination of two of azo initiators or peroxide initiators. Preferably, the azo initiator is selected from: azodiisobutyronitrile (AIBN), and the peroxide initiator is selected from: benzoyl peroxide (BPO).

[0018] Preferably, the preparation method includes: performing free radical polymerization on maleic anhydride and a 1-hexene (C6) dimer, a 1-octene (C8) dimer, or a 1-decene (C10) dimer.

[0019] Preferably, the preparation method includes reacting 1-octadecylamine with the maleic anhydride-α-olefin dimer copolymer.

[0020] Among them, the structure of the α-olefin dimer is: Among them, a and b are independent of each other, and their values can be the same or different. The value ranges of a and b are 1-17.

[0021] Preferably, the α-olefin dimer is obtained by coordination polymerization of a metallocene catalyst system and one or more linear α-olefins, and the number of carbon atoms of the linear α-olefin ranges from 6 to 20. Among them, the metallocene catalyst system includes at least one metallocene catalyst, and the metallocene catalyst is an inorganic-organic complex containing at least one metallocycle or metallocycle derivative as a ligand and at least one Group IVB transition element as a central atom. Preferably, the central atom is selected from zirconium (Zr).

[0022] In a third aspect, the application of the above-mentioned polymer in the preparation of masterbatch.

[0023] In a fourth aspect, a masterbatch composition includes: carrier resin, pigment, dispersant, and other additives.

[0024] Among them, the dispersant is selected from the combination of the above-mentioned polymer and polyethylene wax. The polyethylene wax is selected from polyethylene wax with a weight-average molecular weight not exceeding 3000 and a polydispersity coefficient not exceeding 1.50. Preferably, the polyethylene wax is selected from any one or a combination of POLYWAX1000 or POLYWAX2000 of Baker Hughes.

[0025] The carrier resin is selected from thermoplastic resins and is used as a carrier for pigments. The carrier resin is selected from: homopolyethylene, homopolypropylene, linear low-density polyethylene, metallocene polyethylene, metallocene polypropylene, ethylene-propylene random copolymer, ethylene-propylene block copolymer, ethylene-vinyl acetate copolymer, and metallocene polyolefin elastomer, either alone or in combination.

[0026] The pigment is selected from at least one or a combination of inorganic pigments and organic pigments. The inorganic pigments are selected from: iron oxide red, chrome red, iron oxide yellow, chrome yellow, iron oxide orange, zinc yellow, zinc sulfide, titanium dioxide, zinc white, cobalt blue, iron blue, manganese blue, cobalt green, chromium oxide, cobalt violet, manganese violet, iron oxide black, carbon black, either alone or in combination. The organic pigments are selected from: aromatic heterocyclic pigments, perylene-based pigments, monoazo pigments, diazo pigments, azo condensation pigments, diazo condensation pigments, amino ketone pigments, either alone or in combination. Preferably, the organic pigments are selected from aromatic heterocyclic pigments, specifically including any one or a combination of phthalocyanine, benzimidazolone, quinophthalone, quinacridone, violanthrone, dioxazine, isoindoline, and thioindigo. At the same time, these pigments can be in any form of dry powder, a single pigment dispersion prepared according to conventional methods, or a mixed dispersion of multiple pigments;

[0027] Preferably, the pigment is selected from a mixture of inorganic pigments and organic pigments.

[0028] Other additives include one or a combination of two of antioxidants or UV stabilizers. Among them, the antioxidants are selected from the combination of antioxidant 1010 and antioxidant 1076, and the UV stabilizers are selected from the combination of light stabilizer 531 and light stabilizer 2908.

[0029] Furthermore, the above-mentioned masterbatch composition further includes a filler. Among them, the filler is selected from one or a mixture of more than one of heavy calcium carbonate, light calcium carbonate, magnesium carbonate, clay, talcum powder, barium sulfate, calcium sulfate, mica powder, aluminum hydroxide, calcium hydroxide, hydrotalcite, molecular sieve, kaolin or wollastonite. Adding the filler can enhance the surface hardness of the masterbatch and reduce the production cost of the masterbatch at the same time.

[0030] Furthermore, the above-mentioned masterbatch composition, by mass percentage of its components in the composition, includes: carrier resin 15 - 30 wt%, pigment 55 - 70 wt%, dispersant 5 - 15 wt%, other additives 0.1 - 1.5 wt%;

[0031] Preferably, the above-mentioned masterbatch composition, by mass percentage of its components in the composition, includes: carrier resin 20 - 30 wt%, pigment 60 - 70 wt%, dispersant 5 - 15 wt%, other additives 0.1 - 1.0 wt%;

[0032] Furthermore, the above-mentioned masterbatch composition, by mass percentage of its components in the composition, includes: carrier resin 15 - 30 wt%, pigment 55 - 70 wt%, dispersant 5 - 15 wt%, filler 1 - 5 wt%, other additives 0.1 - 1.5 wt%.

[0033] Fifth aspect, the preparation method of the above-mentioned masterbatch composition includes: mixing the pigment and the dispersant, grinding and pulverizing them, then mixing them with the carrier resin and other additives, then making them uniformly dispersed through melt blending, and then pelletizing, drying and packaging.

[0034] Preferably, the pigment and the dispersant are mixed and ground to an average particle size not exceeding 10 μm;

[0035] Preferably, the pigment, the dispersant, the carrier resin and other additives are mixed at a temperature not lower than 100 °C, and the stirring speed is not lower than 40 r / min;

[0036] Further, a twin-screw extruder is used to melt and blend the masterbatch composition to make it evenly dispersed. The temperature for melt blending is 150 - 300 °C; preferably, the temperature for melt blending is 180 - 250 °C; more preferably, the temperature for melt blending is 220 °C; the screw speed for melt blending is not less than 200 rpm; preferably, the screw speed for melt blending is 200 - 400 rpm; more preferably, the screw speed for melt blending is 220 rpm.

[0037] In a sixth aspect, a polyolefin product is prepared from the masterbatch composition described above; wherein, the polyolefin product includes films or injection molded parts of polyethylene and polypropylene.

[0038] The beneficial effects of the present invention are as follows: The method of free radical polymerization is designed to synthesize an alternating copolymer of maleic anhydride and vinyl monomers. By taking advantage of the significant difference in the electronic effects of the two monomers, which easily form an alternating copolymer arranged in a head-to-tail manner during the free radical polymerization process, a series of alternating polymers are synthesized based on α-olefin dimers using free radical initiators, including: maleic anhydride-α-olefin dimer copolymer and N-alkyl maleamide-α-olefin dimer copolymer.

[0039] Polar succinic anhydride segments and non-polar long carbon hydrocarbon segments are alternately formed on the main chain of this alternating copolymer. The distribution of polar segments and non-polar segments is more uniform and regular, thereby further increasing the steric hindrance effect of the polymer and the dispersion and coating effects on pigments, thus improving the dispersion performance of pigments and the anti-aging effect. However, due to the relatively high molecular weight of the copolymer itself, a low molecular weight polyethylene wax is used as a dispersant in combination, which has both dispersion and lubrication effects, helping the masterbatch composition to be more evenly melt-mixed. The finally prepared polyolefin product has a lower color difference, more stable coloring performance, and better ultraviolet light aging resistance. At the same time, this route also utilizes the light component by-product α-olefin dimer generated during the α-olefin coordination polymerization process, thereby expanding the application field of low molecular weight poly-α-olefins and increasing their economic value. Description of the Drawings

[0040] Figure 1 is the 1H-NMR spectrum of 1-hexene (C6) dimer ( 1 H-NMR).

[0041] Figure 2 is the 1H-NMR spectrum of 1-octene (C8) dimer ( 1 H-NMR).

[0042] Figure 3 is the 1H-NMR spectrum of 1-decene (C10) dimer ( 1 H-NMR).

[0043] Figure 4 1H-NMR spectrum of the maleic anhydride-α-olefin dimer copolymer prepared in Example 1 1 1H-NMR

[0044] Figure 5 1H-NMR spectrum of the N-octadecyl maleamide-α-olefin dimer copolymer prepared in Example 2 1 1H-NMR

[0045] Figure 6 1H-NMR spectrum of the maleic anhydride-α-olefin dimer copolymer prepared in Example 3 1 1H-NMR

[0046] Figure 7 1H-NMR spectrum of the N-octadecyl maleamide-α-olefin dimer copolymer prepared in Example 4 1 1H-NMR

[0047] Figure 8 1H-NMR spectrum of the maleic anhydride-α-olefin dimer copolymer prepared in Example 5 1 1H-NMR

[0048] Figure 9 1H-NMR spectrum of the N-octadecyl maleamide-α-olefin dimer copolymer prepared in Example 6 1 1H-NMR

[0049] Figure 10 Molecular weight distribution curves of maleic anhydride-α-olefin dimer copolymer (a) and N-octadecyl maleamide-α-olefin dimer copolymer (b) prepared using 1-hexene (C6) dimer as raw material

[0050] Figure 11 Molecular weight distribution curves of maleic anhydride-α-olefin dimer copolymer (c) and N-octadecyl maleamide-α-olefin dimer copolymer (d) prepared using 1-octene (C8) dimer as raw material

[0051] Figure 12 Molecular weight distribution curves of maleic anhydride-α-olefin dimer copolymer (e) and N-octadecyl maleamide-α-olefin dimer copolymer (f) prepared using 1-decene (C10) dimer as raw material

[0052] Figure 13 Torque-time curves during the mixing process of the masterbatch composition samples prepared in Examples 9, 11, 17 and Comparative Examples 1, 2 tested at 160 °C and a screw speed of 80 r / min Detailed Description of the Invention

[0053] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] If the specific experimental conditions are not specified in the embodiments, they are usually in accordance with the conventional conditions in the art or in accordance with the conditions recommended by the reagent company; the materials, reagents, etc. used in the embodiments, unless otherwise specified, can be obtained through commercial channels.

[0056] Preparation of α-olefin dimer: First, poly-α-olefin dimer is obtained by coordination polymerization of linear α-olefin. The polymerization reaction is carried out in a 2000 mL PARR high-pressure stirring reactor. First, the reactor is heated to above 100 °C and evacuated and baked for 1 h, during which it is replaced with high-purity nitrogen multiple times to remove water / oxygen impurities in the reactor. Subsequently, the reactor temperature is adjusted to the reaction temperature of 70 °C by circulating cooling water through the jacket, 800 mL of α-olefin is added, the stirring rate is started at 500 rpm, and after stirring for 15 min, the main catalyst, the handle-type metal-organic compound siloxane-bridged bis(cyclopentadienyl)zirconium dichloride (Yapei Technology), dissolved in 350 mL of n-hexane is added to the reactor. The corresponding structural formula is: And co-catalyst modified methylaluminoxane (MMAO-12, with an Al content of 7 wt%, solvent is toluene, from Millipore Sigma), chain transfer agent triisobutylaluminum (TIBA, 0.1 mol / L dissolved in hexane solvent, from Millipore Sigma). The concentration of the metallocene main catalyst in the polymerization reaction system is 0.3 mmol / L (calculated as Zr), the concentration of MMAO-12 in the polymerization reaction system is 30 mmol / L (calculated as Al), and the concentration of TIBA in the polymerization reaction system is 30 mmol / L (calculated as Al). Open the nitrogen valve to fill nitrogen to a pressure of 0.15 MPa, end the reaction after 1 h, open the vent pipe to relieve pressure, discharge the crude product from the reaction kettle, add 10 mL of acidified ethanol to the crude product to terminate the reaction, then add activated clay accounting for 3 wt% of the total amount of the crude product to adsorb and remove catalyst residues, and then perform pressure filtration to obtain a filtrate. The filtrate is subjected to vacuum distillation to separate α-olefin dimers with different carbon numbers.

[0057] Separation conditions of α-olefin dimers: When the α-olefin is 1-hexene (C6), collect the fraction at 70 - 90 °C under a vacuum of 7 torr to separate the C6 dimer; when the α-olefin is 1-octene (C8), collect the fraction at 100 - 120 °C under a vacuum of 0.8 torr to separate the C8 dimer; when the α-olefin is 1-decene (C10), collect the fraction at 110 - 130 °C under a vacuum of 0.5 torr to separate the C10 dimer.

[0058] Example 1

[0059] Synthesis of maleic anhydride-α-olefin dimer alternating copolymer: Mix maleic anhydride (9.80 g, 0.1 mol), 1-hexene (C6) dimer (16.80 g, 0.1 mol) and mixed xylene (XYL solvent, 30 mL) in a reaction flask filled with nitrogen, and then place the flask in a constant-temperature oil bath. After maintaining at an external bath temperature of 110 °C for 10 min, add a 5 mL solution of benzoyl peroxide (BPO) dissolved in toluene (BPO concentration is 0.1 mol / L) to the reaction flask and mix. Continue to maintain the oil bath temperature at 110 °C and react for 4 h. Subsequently, remove the solvent under reduced pressure, wash the residue in batches with methanol (3 × 30 mL), perform suction filtration, and take the filter cake for vacuum drying to obtain 19.9 g of a white powdery product, which is maleic anhydride-α-olefin dimer alternating copolymer.

[0060] Example 2

[0061] Synthesis of N-octadecyl maleamide-α-olefin dimer alternating copolymer: 10 g of the product obtained in Example 1 and 1-octadecylamine (28.30 g, 0.105 mmol) were placed in a reaction flask filled with nitrogen and mixed. The reaction mixture was kept stirring at 130 °C for 10 h, cooled, filtered with methanol (3 × 30 mL) in batches, and the filter cake was taken for vacuum drying to obtain 30.4 g of a light yellow powdery product, which is N-octadecyl maleamide-α-olefin dimer alternating copolymer.

[0062] Example 3

[0063] Synthesis of maleic anhydride-α-olefin dimer alternating copolymer: Maleic anhydride (9.80 g, 0.1 mol), 1-octene (C8) dimer (22.40 g, 0.1 mol) and 50 mL of XYL solvent were mixed in a reaction flask filled with nitrogen, and then the flask was placed in a constant temperature oil bath. After maintaining at an external bath temperature of 110 °C for 10 min, a 5 mL solution of benzoyl peroxide (BPO) dissolved in toluene (BPO concentration: 0.1 mol / L) was added to the reaction flask and mixed. The oil bath temperature was continuously maintained at 110 °C for 4 h, and then the solvent was removed under reduced pressure. The residue was washed with methanol (3 × 30 mL) in batches, filtered, and the filter cake was taken for vacuum drying to obtain 27.6 g of a white powdery product, which is maleic anhydride-α-olefin dimer alternating copolymer.

[0064] Example 4

[0065] Synthesis of N-octadecyl maleamide-α-olefin dimer alternating copolymer: 10 g of the product obtained in Example 3 and 1-octadecylamine (28.30 g, 0.105 mmol) were placed in a reaction flask filled with nitrogen and mixed. The reaction mixture was kept stirring at 135 °C for 12 h, cooled, filtered with methanol (3 × 30 mL) in batches, and the filter cake was taken for vacuum drying to obtain 29.8 g of a light yellow powdery product, which is N-octadecyl maleamide-α-olefin dimer alternating copolymer.

[0066] Example 5

[0067] Synthesis of maleic anhydride-α-olefin dimer alternating copolymer: Maleic anhydride (9.80 g, 0.1 mol), 1-decene (C10) dimer (28.00 g, 0.1 mol) and 60 mL of XYL solvent were mixed in a reaction flask filled with nitrogen, and then the flask was placed in a constant-temperature oil bath. After maintaining at an external bath temperature of 110 °C for 10 min, a 5 mL solution of benzoyl peroxide (BPO) dissolved in toluene (BPO concentration: 0.1 mol / L) was added to the reaction flask and mixed. The oil bath temperature was continuously maintained at 110 °C for 4 h, and then the solvent was removed under reduced pressure. The residue was washed batchwise with methanol (3 × 30 mL), filtered by suction, and the filter cake was taken for vacuum drying to obtain 39.2 g of a white powdery product, which is maleic anhydride-α-olefin dimer alternating copolymer.

[0068] Example 6

[0069] Synthesis of N-octadecyl maleamide-α-olefin dimer alternating copolymer: 10 g of the product obtained in Example 5 and 1-octadecylamine (28.30 g, 0.105 mmol) were placed in a reaction flask filled with nitrogen and mixed. The reaction mixture was kept stirring at 135 °C for 12 h, cooled, washed batchwise with methanol (3 × 30 mL), filtered by suction, and the filter cake was taken for vacuum drying to obtain 29.1 g of a light yellow powdery product, which is N-octadecyl maleamide-α-olefin dimer alternating copolymer.

[0070] Example 7

[0071] Formulation of masterbatch: 15 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 9 wt% of maleic anhydride-α-olefin dimer alternating copolymer of Example 1, 2 wt% of POLYWAX2000 (polyethylene wax from Baker Hughes), 60 wt% of composite pigment (rutile titanium dioxide, pigment yellow 147, phthalocyanine green prepared according to a mass ratio of 4:1:1), 4 wt% of talc powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1).

[0072] Preparation of masterbatch: First, the pigment and dispersant were compounded. Rutile titanium dioxide, pigment yellow 147, and phthalocyanine green were mixed according to a mass ratio of 4:1:1 to obtain a composite pigment. The alternating copolymer of maleic anhydride-α-olefin dimer as the dispersant, POLYWAX2000 polyethylene wax, and the composite pigment were mixed and then ground by a jet mill (compressed air pressure: 0.7 MPa) to an average particle size not exceeding 10 μm.

[0073] The above mixture, carrier resin, filler and other additives were mixed in a ZJL-200 twin-screw torque rheometer at a screw speed of 80 r / min and a temperature of 160 °C for 20 min. Then, melt blending was carried out using a twin-screw extruder with the temperature controlled at 200 °C and the screw speed at 220 rpm. Through the shearing and mixing of the screw, the pigment was evenly dispersed in the carrier resin. Subsequently, pelletizing, drying and packaging processes were carried out to obtain the masterbatch.

[0074] Example 8

[0075] Formulation of the masterbatch: 8 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 8 wt% of the maleic anhydride-α-olefin dimer alternating copolymer of Example 1, 3 wt% of POLYWAX1000 (manufactured by Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide and iron oxide yellow formulated at a mass ratio of 85:15), 4 wt% of talcum powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 at a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 at a mass ratio of 3:1).

[0076] The preparation method of the masterbatch was the same as that of Example 7.

[0077] Example 9

[0078] Formulation of the masterbatch: 16 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 7 wt% of the N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 2, 2 wt% of POLYWAX2000 (manufactured by Baker Hughes) polyethylene wax, 62 wt% of composite pigment (rutile titanium dioxide, pigment yellow 147 and phthalocyanine green formulated at a mass ratio of 4:1:1), 3 wt% of talcum powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 at a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 at a mass ratio of 3:1). The preparation method of the masterbatch was the same as that of Example 7.

[0079] Example 10

[0080] Formulation of masterbatch: 8 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 8 wt% of N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 2, 3 wt% of POLYWAX1000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide and iron oxide yellow formulated by mass ratio of 85:15), 4 wt% of talcum powder, 0.5 wt% of UV stabilizer (light stabilizer 531 and light stabilizer 2908 compounded by mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010 and antioxidant 1076 compounded by mass ratio of 3:1).

[0081] The preparation method of the masterbatch is the same as that of Example 7.

[0082] Example 11

[0083] Formulation of masterbatch: 15 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 9 wt% of alternating copolymer of maleic anhydride-α-olefin dimer of Example 3, 2 wt% of POLYWAX2000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide, pigment yellow 147 and phthalocyanine green formulated by mass ratio of 4:1:1), 4 wt% of talcum powder, 0.5 wt% of UV stabilizer (light stabilizer 531 and light stabilizer 2908 compounded by mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010 and antioxidant 1076 compounded by mass ratio of 3:1). The preparation method of the masterbatch is the same as that of Example 7.

[0084] Example 12

[0085] Formulation of masterbatch: 8 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 8 wt% of alternating copolymer of maleic anhydride-α-olefin dimer of Example 3, 3 wt% of POLYWAX1000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide and iron oxide yellow formulated by mass ratio of 85:15), 4 wt% of talcum powder, 0.5 wt% of UV stabilizer (light stabilizer 531 and light stabilizer 2908 compounded by mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010 and antioxidant 1076 compounded by mass ratio of 3:1).

[0086] The preparation method of the masterbatch is the same as that of Example 7.

[0087] Example 13

[0088] The formulation of the masterbatch: 16 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 7 wt% of N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 4, 2 wt% of POLYWAX2000 (Baker Hughes) polyethylene wax, 62 wt% of composite pigment (rutile titanium dioxide, pigment yellow 147, phthalocyanine green formulated in a mass ratio of 4:1:1), 3 wt% of talc powder, 0.5 wt% of UV stabilizer (light stabilizer 531: light stabilizer 2908 compounded in a mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010: antioxidant 1076 compounded in a mass ratio of 3:1). The preparation method of the masterbatch is the same as that of Example 7.

[0089] Example 14

[0090] The formulation of the masterbatch: 8 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 8 wt% of N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 4, 3 wt% of POLYWAX1000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide, iron oxide yellow formulated in a mass ratio of 85:15), 4 wt% of talc powder, 0.5 wt% of UV stabilizer (light stabilizer 531: light stabilizer 2908 compounded in a mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010: antioxidant 1076 compounded in a mass ratio of 3:1).

[0091] The preparation method of the masterbatch is the same as that of Example 7.

[0092] Example 15

[0093] The formulation of the masterbatch: 15 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 9 wt% of maleic anhydride-α-olefin dimer alternating copolymer of Example 5, 2 wt% of POLYWAX2000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide, pigment yellow 147, phthalocyanine green formulated in a mass ratio of 4:1:1), 4 wt% of talc powder, 0.5 wt% of UV stabilizer (light stabilizer 531: light stabilizer 2908 compounded in a mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010: antioxidant 1076 compounded in a mass ratio of 3:1). The preparation method of the masterbatch is the same as that of Example 7.

[0094] Example 16

[0095] Formulation of the masterbatch: 8 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 8 wt% of maleic anhydride-α-olefin dimer alternating copolymer of Example 5, 3 wt% of POLYWAX1000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide, iron oxide yellow formulated in a mass ratio of 85:15), 4 wt% of talc powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1).

[0096] The preparation method of the masterbatch is the same as that of Example 7.

[0097] Example 17

[0098] Formulation of the masterbatch: 16 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 7 wt% of N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 6, 2 wt% of POLYWAX2000 (Baker Hughes) polyethylene wax, 62 wt% of composite pigment (rutile titanium dioxide, pigment yellow 147, phthalocyanine green formulated in a mass ratio of 4:1:1), 3 wt% of talc powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1). The preparation method of the masterbatch is the same as that of Example 7.

[0099] Example 18

[0100] Formulation of the masterbatch: 8 wt% of linear low-density polyethylene (LLDPE) with an MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with an MI of 30 g / 10 min, 8 wt% of N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 6, 3 wt% of POLYWAX1000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide, iron oxide yellow formulated in a mass ratio of 85:15), 4 wt% of talc powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1).

[0101] The method for preparing the masterbatch is the same as that in Example 7.

[0102] Comparative Example 1

[0103] The formulation of the masterbatch: 16 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 9 wt% of polyethylene wax POLYWAX2000 (Baker Hughes), 62 wt% of composite pigment (rutile titanium dioxide, Pigment Yellow 147, phthalocyanine green prepared according to the mass ratio of 4:1:1), 3 wt% of talcum powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1).

[0104] The method for preparing the masterbatch is the same as that in Example 7.

[0105] Comparative Example 2

[0106] The formulation of the masterbatch: 16 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 9 wt% of N-octadecyl maleamide-α-olefin dimer alternating copolymer of Example 4, 62 wt% of composite pigment (rutile titanium dioxide, Pigment Yellow 147, phthalocyanine green prepared according to the mass ratio of 4:1:1), 3 wt% of talcum powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1).

[0107] The method for preparing the masterbatch is the same as that in Example 7.

[0108] Comparative Example 3

[0109] The formulation of the masterbatch: 16 wt% of linear low-density polyethylene (LLDPE) with MI of 50 g / 10 min, 9 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 7 wt% of FB521 type polyolefin elastomer grafted maleic anhydride (POE-g-MAH) copolymer (Jia Yirong Polymer), 2 wt% of polyethylene wax POLYWAX2000 (Baker Hughes), 62 wt% of composite pigment (rutile titanium dioxide, Pigment Yellow 147, phthalocyanine green prepared according to the mass ratio of 4:1:1), 3 wt% of talcum powder, 0.5 wt% of UV stabilizer (a compound of light stabilizer 531 and light stabilizer 2908 in a mass ratio of 3:1), 0.5 wt% of antioxidant (a compound of antioxidant 1010 and antioxidant 1076 in a mass ratio of 3:1).

[0110] The method for preparing the masterbatch is the same as that in Example 7.

[0111] Comparative Example 4

[0112] Formulation of the masterbatch: 8 wt% of linear low density polyethylene (LLDPE) with MI of 50 g / 10 min, 16 wt% of metallocene polyethylene (m-PE) with MI of 30 g / 10 min, 8 wt% of CMG9801 type polypropylene grafted maleic anhydride (PP-g-MAH) copolymer (Jia Yirong Polymer), 3 wt% of POLYWAX2000 (Baker Hughes) polyethylene wax, 60 wt% of composite pigment (rutile titanium dioxide and iron oxide yellow formulated by mass ratio of 85:15), 4 wt% of talc powder, 0.5 wt% of UV stabilizer (light stabilizer 531: light stabilizer 2908 compounded by mass ratio of 3:1), 0.5 wt% of antioxidant (antioxidant 1010: antioxidant 1076 compounded by mass ratio of 3:1). The method for preparing the masterbatch is the same as that in Example 7.

[0113] Among them, the polyethylene wax used in the above examples or comparative examples is POLYWAX1000 or POLYWAX2000 of Baker Hughes, and the corresponding product molecular weights and properties are shown in Table 1. It can be seen from the data in Table 1 that the weight average molecular weight of the polyethylene wax does not exceed 3000, the molecular weight distribution is very narrow, not exceeding 1.40, and its melt drop point is greater than 110 °C, belonging to hard wax.

[0114] Table 1

[0115] <![CDATA[M w > <![CDATA[M n > <![CDATA[PD(M w / M n )]]> Penetration (dmm) Drop melting point (°C) POLYWAX1000 1190 848 1.40 1.0 113 POLYWAX2000 2536 1890 1.34 0.5 126

[0116] The test characterizations for the polymers (maleic anhydride-α-olefin dimer alternating copolymer or N-octadecyl maleamide-α-olefin dimer alternating copolymer) prepared in Examples 1-6 include: elemental analysis (C, H, N, O) was carried out on a PerkinElmer Series IICHNS / O Analyzer 2400. Gel permeation chromatography (GPC) analysis was performed using an Agilent PLGPC 220 chromatograph equipped with a PLgel Olexis column. GPC used tetrahydrofuran containing 5% acetic acid as the eluent (flow rate of 1 mL / min), the test temperature was 40 °C, and polystyrene was used as the molecular weight calibration standard. The structural characterization of the copolymer sample was carried out by nuclear magnetic resonance hydrogen spectrum ( 1 1H-NMR, the solvent was CDCl 3 3). Among them, the results of elemental analysis are shown in Table 2, 1 the results of 1H-NMR are shown in the appendix of the specification Figure 1-9, the test results of GPC can be found in the attached specification Figure 10-12 .

[0117] Table 2

[0118]

[0119] From the data in Table 2 and the attached specification Figure 1-12 it can be seen that the polymer elements prepared in Examples 1, 3, and 5 contain C, H, and O, and the molecular weight M w ranges from 5000 to 50000. The size of the molecular weight is related to the carbon number of the selected α-olefin dimer. The higher the carbon number of the α-olefin dimer, the higher the molecular weight of the polymer prepared.

[0120] Based on Examples 1, 3, and 5, Examples 2, 4, and 6 add 1-octadecylamine to carry out a ring-opening reaction with maleic anhydride, thereby increasing the number-average molecular weight and weight-average molecular weight of the polymer, and introducing N element into the polymer at the same time.

[0121] The tests for the masterbatch composition samples prepared in Examples 7-18 and Comparative Examples 1-3 include:

[0122] Dispersion test of masterbatch in polyolefin: The prepared masterbatch was added to polypropylene, and a sample sheet with a thickness of 2.5 mm was obtained by injection molding with an injection molding machine, and a polypropylene film was obtained by calendering at 200 °C. Observe the size of the pigment particles therein, and count the number of pigment particles with diameters of 5 μm, 10 μm, 30 μm, and more than 100 μm, and thus conduct a dispersion rating. The specific rating indicators are shown in Table 3.

[0123] Table 3

[0124] Grade 5 4 3 2 1 Average particle size of pigment ions / μm ＜5 5-10 10-30 30-100 ＞100

[0125] Total color difference test: Referring to the method of Q / SYRD-R-2014-2014 polyolefin masterbatch standard, the masterbatch and polypropylene pellets were mixed at a mass ratio of 1:8. After blending, they were injection molded into test specimens at 200 °C. The color difference meter of LS173 (Shenzhen Linshang Technology Co., Ltd.) was used to measure the test specimens and the standard samples respectively under the D65 light source, and thus ΔL, Δa, and Δb were obtained. Further, ΔE was calculated according to Equation (1).

[0126]

[0127] Weather resistance test: The test specimens obtained by injection molding at 200 °C were placed in an ultraviolet aging test chamber and aged under the same conditions for 1000 h. After removal, ΔL, Δa, and Δb were continuously measured according to the method of total color difference measurement, and the total color difference ΔE after aging was calculated. The weather resistance of the masterbatch was judged by the value of the total color difference ΔE after aging, and the ΔE value was used to evaluate the color consistency and matching degree.

[0128] Balanced torque test: During the preparation of the masterbatch, when the dispersant, pigment, carrier resin, filler, and other additives were mixed well, the torque-time curve of the corresponding sample was further measured by a torque rheometer at 160 °C and a screw speed of 80 r / min (the corresponding attached drawing is Figure 13 ), and the balanced torque and the time to reach the maximum torque were obtained therefrom.

[0129] The test results of the masterbatch composition samples prepared in Examples 7-18 and Comparative Examples 1-3 are listed in Table 4.

[0130] Table 4

[0131]

[0132]

[0133] From the data in Table 4, it can be seen that the masterbatch prepared in Examples 7-18 using the maleic anhydride-α-olefin dimer alternating copolymer or N-octadecyl maleamide-α-olefin dimer alternating copolymer prepared in Examples 1-6 has better dispersibility, a lower particle size of the pigment particles in the polypropylene film prepared by calendering, a smaller total color difference of the polypropylene test plate obtained by injection molding, and a smaller total color difference after 1000 hours of aging, and higher aging resistance. From the torque-time curve and balanced torque of the material melt blending in the torque rheometer, it can be seen that the balanced torque of the formulation in Examples 7-18 is lower during the material blending process, which indicates that adding the polymer prepared in Examples 1-6 is beneficial to improving the compatibility between the pigment particles and the organic components in the formulation, and has an obvious effect on increasing the interfacial binding between the two.

[0134] In addition, through the data analysis of Table 4, it was also found that the alternating copolymer prepared using α-olefin dimers with more carbon chains has better dispersion and compatibility effects, and the color difference of the prepared polyolefin products is lower and the aging resistance is higher. By analyzing Examples 7-10, Examples 11-14, and Examples 15-18 with the same number of carbon atoms, it was found that the N-octadecyl maleamide-α-olefin dimer copolymer prepared by further reacting 1-octadecylamine with maleic anhydride has better dispersion and coating protection effects on the pigment particles in the masterbatch composition, and the color difference of the corresponding polyolefin products is lower and the aging resistance is better.

[0135] The formulation of the masterbatch composition proposed in Comparative Example 1 did not add maleic anhydride-α-olefin dimer copolymer or N-octadecyl maleamide-α-olefin dimer copolymer, and used low-molecular-weight POLYWAX2000 polyethylene wax alone as a dispersant. Therefore, the dispersion effect on pigment particles was poor. Its molecular weight was low and it lacked non-polar long side chains for dispersing and coating pigment particles. The color difference of the subsequent prepared polypropylene sample was large and the aging resistance was poor. The equilibrium torque during the material mixing process was higher, indicating poor compatibility between components and making it more difficult to mix.

[0136] The formulation of the masterbatch composition in Comparative Example 2 used the maleic anhydride-α-olefin dimer alternating copolymer prepared in Example 3 alone for dispersion, without adding low-molecular-weight polyethylene wax POLYWAX1000 or POLYWAX2000. From the Figure 11 (c) GPC results, the corresponding molecular weights M of the alternating copolymer prepared in Example 3 w = 10821, M n = 5665, PD = 1.91. It can be seen that the alternating copolymer has a relatively high molecular weight and lacks low-molecular-weight components during the dispersion process, resulting in a relatively low dispersion grade. The equilibrium torque during the material mixing process of the masterbatch composition is high, and the corresponding polypropylene sample has a large color difference and poor aging resistance.

[0137] In Comparative Examples 3 and 4, the commercial graft polymers POE-g-MAH and PP-g-MAH were used together with low-molecular-weight polyethylene wax as dispersants for the masterbatch composition. The dispersion effect on pigment particles was still lower than that of Examples 7-18. The color difference of the prepared polypropylene sample and the color difference after aging were higher than those of Examples 7-18. This is because POE-g-MAH and PP-g-MAH are graft copolymers, and the grafting sites of MAH are randomly distributed without obvious rules. The distribution of the low-polar carbon skeleton and the high-polar maleic anhydride monomer is uneven. In addition, POE is a copolymer of ethylene and α-olefin. Compared with the alternating copolymer prepared in Examples 1-6, the distribution of α-olefin in the molecular chain is uneven. Therefore, the steric hindrance effect of the long carbon chain is difficult to play effectively, thus affecting the dispersion effect on pigment particles. PP-g-MAH is made by grafting maleic anhydride onto polypropylene, and the carbon chain of the PP segment is too short, and there is also a problem that the steric hindrance effect is difficult to play.

[0138] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of them. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. Although the specific implementation manners of the present invention have been described above, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A polymer, characterized in that The molecular chain segments of the polymer include at least one or a combination of two of the following structures: or Wherein, n is a positive integer greater than or equal to 1, R1 is a straight-chain alkane of 4 to 18 carbon atoms, and R2 is a straight-chain alkane of 6 to 20 carbon atoms; further, the weight average molecular weight of the polymer is not less than 5000, and the number average molecular weight is not less than 1500.

2. The method for preparing a polymer according to claim 1, characterized in that: The preparation method comprises: subjecting maleic anhydride and alpha olefin dimer to free radical polymerization to obtain maleic anhydride-alpha olefin dimer copolymer; Alternatively, a linear alkyl primary amine is used to react with the maleic anhydride-α-olefin dimer copolymer to obtain an N-octadecyl maleamide-α-olefin dimer copolymer.

3. The preparation method according to claim 2, characterized in that: The free radical polymerization uses an initiator, and the initiator includes: one or a combination of an azo initiator or a peroxide initiator.

4. The preparation method according to claim 2, characterized in that: The structure of the alpha olefin dimer is: Among them, a and b are independent of each other, and the values ​​can be the same or different. The value range of a and b is 1-17.

5. The preparation method according to claim 2, characterized in that: The alpha olefin dimer is obtained by coordination polymerization of a metallocene catalyst system and one or more linear alpha olefins, wherein the number of carbon atoms in the linear alpha olefins ranges from 6 to 20; wherein the metallocene catalyst system comprises at least one metallocene catalyst, and the metallocene catalyst is an inorganic-organic complex containing at least one cyclopentadienyl or cyclopentadienyl derivative as a ligand and at least one Group IVB transition element as a central atom.

6. Use of the polymer as claimed in claim 1 in the preparation of masterbatch.

7. A masterbatch composition, characterized in that: The masterbatch composition includes: carrier resin, pigment, dispersant, and other additives; Wherein, the dispersant is selected from the combination of the above-mentioned polymer and polyethylene wax, and the polyethylene wax is selected from polyethylene wax having a weight average molecular weight not exceeding 3000 and a polydispersity coefficient not exceeding 1.50; The carrier resin is selected from thermoplastic resins and is used as a carrier of the pigment. The carrier resin is selected from one or more combinations of homopolymer polyethylene, homopolymer polypropylene, linear low-density polyethylene, metallocene polyethylene, metallocene polypropylene, ethylene-propylene random copolymer, ethylene-propylene block copolymer, ethylene-vinyl acetate copolymer and metallocene polyolefin elastomer; The pigment is selected from at least one or a combination of inorganic pigments and organic pigments. The inorganic pigment is selected from any one or a combination of iron oxide red, chrome red, iron oxide yellow, chrome yellow, iron oxide orange, zinc yellow, zinc sulfide, titanium dioxide, zinc white, cobalt blue, iron blue, manganese blue, cobalt green, chromium oxide, cobalt violet, manganese violet, iron oxide black, and carbon black. The organic pigment is selected from any one or a combination of aromatic heterocyclic pigments, perylene pigments, monoazo pigments, diazo pigments, azo condensation pigments, diazo condensation pigments, and aminoketone pigments. Preferably, the pigment is selected from a mixture of inorganic pigments and organic pigments; Other additives include: one or a combination of antioxidants or UV stabilizers, wherein the antioxidant is selected from a combination of antioxidant 1010 and antioxidant 1076, and the UV stabilizer is selected from a combination of light stabilizer 531 and light stabilizer 2908; Furthermore, the masterbatch composition described above also includes a filler, wherein the filler is selected from a mixture of one or more of heavy calcium carbonate, light calcium carbonate, magnesium carbonate, clay, talc, barium sulfate, calcium sulfate, mica powder, aluminum hydroxide, calcium hydroxide, hydrotalcite, molecular sieve, kaolin or wollastonite. Adding the filler can enhance the surface hardness of the masterbatch while reducing the production cost of the masterbatch.

8. The masterbatch composition according to claim 7, characterized in that: The masterbatch composition comprises, according to the mass percentage of each component in the composition: 15-30wt% of carrier resin, 55-70wt% of pigment, 5-15wt% of dispersant, and 0.1-1.5wt% of other additives; Preferably, the masterbatch composition described above comprises, according to the mass percentage of each component in the composition: 20-30wt% of carrier resin, 60-70wt% of pigment, 5-15wt% of dispersant, and 0.1-1.0wt% of other additives; Furthermore, the masterbatch composition described above includes, according to the mass percentage of each component in the composition: carrier resin 15-30wt%, pigment 55-70wt%, dispersant 5-15wt%, filler 1-5wt%, and other additives 0.1-1.5wt%.

9. The method for preparing the masterbatch composition according to any one of claims 7 and 8, characterized in that: The preparation method comprises: mixing the pigment and the dispersant, grinding and pulverizing the mixture, mixing the mixture with the carrier resin and other additives, and then melting and blending the mixture to make it uniformly dispersed, and then granulating, drying and packaging the mixture; Preferably, the pigment is mixed with a dispersant and ground to an average particle size of no more than 10 μm; Furthermore, a twin-screw extruder is used to melt-blend the masterbatch composition to make it uniformly dispersed, the temperature of the melt-blending is 150-300° C., and the screw speed of the melt-blending is not less than 200 rpm.

10. A polyolefin product, characterized in that: The polyolefin product is prepared from the masterbatch composition according to any one of claims 7 and 8; wherein the polyolefin product comprises a polyethylene or polypropylene film or an injection molded part.

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