Polyolefin wear-resistant material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of high polymer materials, and relates to a polyolefin wear-resistant material and a preparation method and application thereof, the polyolefin wear-resistant material comprises polyolefin, a styrene elastomer, a thermoplastic polyurethane elastomer, mineral oil and a compatilizer, the compatilizer is obtained by initiating an initiator to generate free radicals to promote the grafting monomer to be grafted to the main chain of the ethylene-octene copolymer; the styrene elastomer and the thermoplastic polyurethane elastomer are selected to be matched, and the compatilizer taking the ethylene-octylene copolymer as a main chain is added to improve the compatibility of all the components, so that the obtained polyolefin wear-resistant material has good wear resistance on the premise that the wear-resistant filler is not required to be added; the excellent wear resistance, the good processing fluidity and the balanced mechanical property can be obtained, and the cost is low.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, and relates to a polyolefin wear-resistant material, its preparation method and application. Background Technology

[0002] Polyolefin materials mainly include polyethylene (PE), polypropylene (PP) and ethylene-vinyl acetate copolymer (EVA), etc. Due to their excellent chemical stability, corrosion resistance, low density and processing cost, they are widely used in the manufacture of pipeline systems for transporting various media, such as slurry transport pipes, chemical fluid pipes, water supply and drainage pipes, etc.

[0003] Currently, among polyolefin materials used in pipeline systems, especially high-density polyethylene (HDPE) and ultra-high molecular weight polyethylene (UHMWPE), their wear resistance is still insufficient under harsh working conditions where they are subjected to the scouring of high-speed particulate media inside the pipeline. This leads to rapid thinning of the pipeline wall, shortened service life, and even leakage risks, which greatly limits the further application of polyolefin pipelines in heavy wear fields such as mining, metallurgy, power, and dredging. In the prior art, wear-resistant fillers are commonly used to improve the wear resistance of polyolefins. For example, CN101182381A discloses a modified polypropylene material and its preparation method. This material is composed of at least a polymer matrix mainly composed of polypropylene and a β nucleating agent. Other wear-resistant modifiers and various additives may also be added. Its characteristic is that the polypropylene matrix contains a β crystal form, that is, the crystal morphology of polypropylene in the matrix material is partially or completely transformed from the usual α crystal form to the β crystal form. This invention improves the wear resistance of polyolefins by adding fillers or fibers, but it can easily lead to the deterioration of the material's toughness and may also cause new problems such as difficulty in the flow processing of the obtained wear-resistant material, anisotropy, or contamination of the medium.

[0004] Therefore, developing a polyolefin abrasive with excellent wear resistance, good processing fluidity, low cost, and balanced mechanical properties remains a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a polyolefin wear-resistant material, its preparation method, and its application. The polyolefin wear-resistant material, through the rational combination of its various components, can possess excellent wear resistance, good processing fluidity, balanced mechanical properties, and low cost, making it suitable for application in the field of wear-resistant pipelines.

[0006] To achieve this objective, the present invention employs the following technical solution: In a first aspect, the present invention provides a polyolefin abrasion-resistant material, wherein the polyolefin abrasion-resistant material comprises the following components in parts by weight: 10-50 parts by weight of polyolefin; 10-30 parts by weight of styrene-based elastomers; 20-40 parts by weight of thermoplastic polyurethane elastomer; 10-20 parts by weight of mineral oil; Compatibilizer 10-20 parts by weight; The compatibilizer is obtained by initiating free radicals through an initiator, which then promotes the grafting of the grafted monomers to the main chain of the ethylene-octene copolymer.

[0007] The content of the polyolefin can be 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, or 50 parts by weight, etc.

[0008] The content of the styrene elastomer can be 10 parts by weight, 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, or 30 parts by weight, etc.

[0009] The content of the thermoplastic polyurethane elastomer can be 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, or 40 parts by weight, etc.

[0010] The mineral oil content can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, or 20 parts by weight, etc.

[0011] The polyolefin wear-resistant material provided by this invention comprises a specific proportion of polyolefin, styrene-based elastomer, thermoplastic polyurethane elastomer, mineral oil, and compatibilizer. The compatibilizer is specifically defined as being obtained by initiating free radicals through an initiator to graft graft monomers onto the ethylene-octene copolymer backbone. By adding styrene-based elastomer and thermoplastic polyurethane elastomer, which have significant advantages in wear resistance, and using a compatibilizer with the ethylene-octene copolymer as the backbone, the compatibilization between the components is improved. The ethylene-octene copolymer is selected as the backbone of the compatibilizer because it has advantages such as good compatibility with other components and high elastic recovery rate. This further improves the wear resistance, processing performance, and mechanical properties of the resulting polyolefin wear-resistant material. Without the addition of wear-resistant fillers, the resulting polyolefin wear-resistant material achieves excellent wear resistance, good processing fluidity, low cost, and balanced mechanical properties, making it suitable for application in the field of wear-resistant pipelines, especially as a pipeline inner wall material.

[0012] Preferably, the polyolefin includes polyethylene and / or ethylene-octene copolymer.

[0013] The polyolefin wear-resistant material provided by this invention can have excellent wear resistance without using high-end polyolefin materials that are difficult to process, such as UHMWPE, and can further ensure even better processing performance.

[0014] Preferably, the number-average molecular weight of the styrene elastomer is ≥300,000, such as 350,000, 400,000, 450,000, 500,000, 550,000, 600,000, 700,000, 800,000, 900,000 or 1,000,000.

[0015] Preferably, the styrene-based elastomer is a star-shaped resin.

[0016] Preferably, the thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer.

[0017] Preferably, the mineral oil includes white oil and / or naphthenic oil.

[0018] Preferably, the grafting rate of the compatibilizer is 0.5-1%, for example, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95% or 1%.

[0019] Preferably, the initiator comprises 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

[0020] Preferably, the grafting monomer includes glycidyl methacrylate. The glycidyl methacrylate is selected as the grafting monomer because the epoxy functional groups on the glycidyl methacrylate have high reactivity with thermoplastic polyurethane elastomers.

[0021] Preferably, the method for preparing the compatibilizer includes: mixing an initiator and a graft monomer, adding an ethylene-octene copolymer, and reacting to obtain the compatibilizer.

[0022] Preferably, the mass ratio of the initiator, graft monomer, and ethylene-octene copolymer is (0.1~0.4):(2~6):(93.6~97.9), for example, 0.1:2:93.6, 0.15:2.5:94, 0.2:3:94.5, 0.25:4:95, 0.3:4.5:96, 0.35:5:97, or 0.4:6:97.9, etc.

[0023] Preferably, the reaction temperature is 80~190℃, such as 80℃, 90℃, 100℃, 120℃, 140℃, 160℃, 180℃ or 190℃.

[0024] Preferably, the polyolefin abrasion-resistant material further includes fillers.

[0025] Preferably, the filler content in the polyolefin wear-resistant material is 0.1 to 2 parts by weight, such as 0.1 parts by weight, 0.2 parts by weight, 0.4 parts by weight, 0.6 parts by weight, 0.8 parts by weight, 1 part by weight, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, or 2 parts by weight. The addition of the filler can further improve the wear resistance of the obtained polyolefin wear-resistant material, but its addition amount is relatively low, which can effectively avoid the problem of poor compatibility of various components due to excessive filler addition.

[0026] Preferably, the filler comprises any one or a combination of at least two of titanium dioxide, talc, calcium carbonate, silica, or polytetrafluoroethylene powder.

[0027] Preferably, the polyolefin abrasion-resistant material further includes an antioxidant.

[0028] Preferably, the antioxidant content in the polyolefin abrasion-resistant material is 0.1 to 0.5 parts by weight, such as 0.1 parts by weight, 0.15 parts by weight, 0.2 parts by weight, 0.25 parts by weight, 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, 0.45 parts by weight, or 0.5 parts by weight.

[0029] Preferably, the antioxidant comprises any one or a combination of at least two of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butyl)phosphite, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, or 2,6-di-tert-butyl-p-cresol.

[0030] In a second aspect, the present invention provides a method for preparing the polyolefin abrasion-resistant material as described in the first aspect, the method comprising the following steps: (1) Styrene-based elastomers and mineral oil are mixed to obtain a mixture; (2) The mixture obtained in step (1), thermoplastic polyurethane elastomer, compatibilizer, polyolefin, optional filler and optional antioxidant are mixed, and then extruded, plasticized, stretched and water-cooled and pelletized to obtain the polyolefin wear-resistant material.

[0031] Preferably, the mixing temperature in step (1) is 30~50℃, such as 30℃, 32℃, 34℃, 36℃, 38℃, 40℃, 42℃, 44℃, 46℃, 48℃ or 50℃.

[0032] Preferably, the mixing time in step (1) is 5 to 10 minutes, such as 5 minutes, 5.5 minutes, 6 minutes, 6.5 minutes, 7 minutes, 7.5 minutes, 8 minutes, 8.5 minutes, 9 minutes, 9.5 minutes or 10 minutes.

[0033] Preferably, the mixing in step (1) is carried out under stirring conditions with a rotation speed of 1000~1500 r / min (e.g., 1000 r / min, 1100 r / min, 1200 r / min, 1300 r / min, 1400 r / min or 1500 r / min, etc.).

[0034] Preferably, the mixing temperature in step (2) is 30~50℃, such as 30℃, 32℃, 34℃, 36℃, 38℃, 40℃, 42℃, 44℃, 46℃, 48℃ or 50℃.

[0035] Preferably, the mixing time in step (2) is 10 to 20 minutes, such as 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes, 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes or 20 minutes.

[0036] Preferably, the mixing in step (2) is carried out under stirring conditions with a rotation speed of 1000~1500 r / min (e.g., 1000 r / min, 1100 r / min, 1200 r / min, 1300 r / min, 1400 r / min or 1500 r / min, etc.).

[0037] Preferably, the extrusion plasticizing in step (2) is carried out in a twin-screw extruder.

[0038] Preferably, the twin-screw extruder includes a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone, a seventh zone, an eighth zone, a ninth zone, a tenth zone, and an eleventh zone connected in sequence; The temperature in Zone 1 is 80-90℃ (e.g., 80℃, 81℃, 82℃, 83℃, 84℃, 85℃, 86℃, 87℃, 88℃, 89℃, or 90℃, etc.); the temperature in Zone 2 is 120-140℃ (e.g., 120℃, 122℃, 124℃, 126℃, 128℃, 130℃, 132℃, 134℃, 136℃, 138℃, or 140℃, etc.); the temperature in Zone 3 is 150-170℃ (e.g., 150℃, 152℃, 154℃, 156℃, 158℃, 160℃, 162℃, 164℃, 166℃, 168℃, or 170℃, etc.); and the temperature in Zone 4 is 160℃. The temperatures in Zone 1-11 are as follows: ~180℃ (e.g., 160℃, 162℃, 164℃, 166℃, 168℃, 170℃, 172℃, 174℃, 176℃, 178℃, or 180℃, etc.); Zone 5 has temperatures of 180-190℃ (e.g., 180℃, 182℃, 184℃, 186℃, 188℃, or 190℃, etc.); Zone 6 has temperatures of 190-200℃ (e.g., 190℃, 192℃, 194℃, 196℃, 198℃, or 200℃, etc.); and Zones 7-11 all have temperatures of 195-200℃ (e.g., 195℃, 196℃, 197℃, 198℃, 199℃, or 200℃, etc.).

[0039] Thirdly, the present invention provides an application of the polyolefin abrasion-resistant material as described in the first aspect in pipelines.

[0040] Compared with the prior art, the present invention has the following beneficial effects: The polyolefin wear-resistant material provided by this invention comprises a specific proportion of polyolefin, styrene-based elastomer, thermoplastic polyurethane elastomer, mineral oil, and a compatibilizer. The compatibilizer is obtained by initiating free radicals through an initiator to graft graft monomers onto the ethylene-octene copolymer backbone. By adding styrene-based elastomer and thermoplastic polyurethane elastomer, which have significant advantages in wear resistance, and using a compatibilizer with the ethylene-octene copolymer backbone to improve the compatibility between the components, the wear resistance of the resulting polyolefin wear-resistant material is further improved, ensuring that its mortar wear rate is no higher than 0.35%. It also helps to improve its processing performance and mechanical properties. The final polyolefin wear-resistant material achieves excellent wear resistance, good processing fluidity, low cost, and balanced mechanical properties without the need for wear-resistant fillers, making it suitable for application in the field of wear-resistant pipelines, especially as a pipeline inner wall material. Detailed Implementation

[0041] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0042] The "range" disclosed in this invention can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. This type of range definition can include or exclude endpoints; any endpoint can be independently included or excluded, and they can be arbitrarily combined, meaning any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for specific parameters, it is understood that ranges of 60~110 and 80~120 are also expected. Furthermore, if minimum range values ​​1 and 2 are listed, and maximum range values ​​3, 4, and 5 are also listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this invention, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0" and "5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥2, it is equivalent to listing integers such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For instance, when a parameter is described as an integer selected from "2~10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0043] In this invention, "a combination of at least two" refers to a quantity greater than or equal to two, unless otherwise specified. For example, "any combination of one or at least two" means one or more or more items. It can be understood that when referring to "a combination of at least two," it refers to any suitable combination of multiple items, that is, a combination of "at least two" items carried out in a manner that does not conflict with and enables the implementation of this invention.

[0044] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0045] The term "embodiment" as used in this invention means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment or implementation of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0046] Those skilled in the art will understand that the order in which the steps are written in the methods of the various embodiments does not imply a strict execution order. The detailed execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, but are preferably performed sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), meaning that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0047] In this invention, open-ended technical features or solutions described using terms such as "comprising" do not exclude additional members beyond those listed unless otherwise specified. They can be considered as providing both closed-ended features or solutions comprised of the listed members and open-ended features or solutions that include additional members beyond the listed members. For example, A includes a1, a2, and a3. Unless otherwise specified, it may also include other members or exclude additional members. This can be considered as providing both technical features or solutions where "A is composed of a1, a2, and a3" or "A is selected from a1, a2, and a3," and technical features or solutions where "A includes not only a1, a2, and a3, but also other members."

[0048] In this invention, unless otherwise specified, the features or solutions corresponding to "and / or" include any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. For example, "A and / or B" represents a group consisting of A, B, and "a combination of A and B". "Containing A and / or B" can mean "containing A, containing B, and containing A and B", or "containing A, containing B, or containing A and B", and can be appropriately understood according to the context.

[0049] In this invention, the terms "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," "fourth," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on the quantity.

[0050] In this invention, "optional" means that something is optional, that is, it refers to any one of the two parallel solutions of "having" or "not having". If there are multiple "optional" options in a technical solution, unless otherwise specified, and there are no contradictions or mutual constraints, then each "optional" option is independent.

[0051] In this invention, "room temperature" generally refers to 4℃~35℃, and can refer to 20℃±5℃. In some embodiments of this invention, room temperature refers to 20℃~30℃.

[0052] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0053] Information on some of the raw materials involved in the following examples and comparative examples is shown below: (1) Polyethylene: purchased from Shanghai SECCO Petrochemical Co., Ltd., grade LLDPE 0220AA; (2) Ethylene-octene copolymer: purchased from Saudi Basic Industries (China) Investment Co., Ltd., grade POEC0570D; (3) Styrene elastomers: number average molecular weight of 800,000, purchased from LG Chem in South Korea, brand name SEBS LG-501; (4) Thermoplastic polyurethane elastomer: purchased from Shandong Yinuowei Polyurethane Co., Ltd., brand name TPU3380; (5) White oil: purchased from Guangdong Zhonghai Nanlian Energy Co., Ltd., brand name 68# industrial white oil; (6) Naphthenic oil: purchased from Guangdong Zhonghai Nanlian Energy Co., Ltd., brand name is naphthenic oil 4010.

[0054] Preparation Example 1 A compatibilizer is prepared by the following steps: 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and glycidyl methacrylate are weighed and mixed at a mass ratio of 0.2:4 to obtain a reaction solution, which is then injected into a twin-screw extruder via a solution pump. Simultaneously, an ethylene-octene copolymer with a mass ratio of 4:95.8 to glycidyl methacrylate is fed into the twin-screw extruder via an automatic feeding system. The mixture is extruded and plasticized at 80~200℃ to obtain a compatibilizer with a grafting rate of 0.8%. During the twin-screw extrusion process, low-molecular-weight byproducts that did not participate in the reaction are removed by vacuuming.

[0055] Preparation Example 2 A compatibilizer is prepared by the following steps: 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and maleic anhydride are weighed and mixed in a mass ratio of 0.2:3.2 to obtain an excipient. Simultaneously, an ethylene-octene copolymer with a mass ratio of 3.2:96.6 with maleic anhydride is mixed evenly with the excipient and fed into a twin-screw extruder through an automatic feeding system. The mixture is then extruded and plasticized at 80~200℃ to obtain a compatibilizer with a grafting rate of 0.8%. During the twin-screw extrusion process, low-molecular-weight byproducts that did not participate in the reaction are removed by vacuuming.

[0056] Comparative Preparation Example 1 A compatibilizer, which differs from Preparation Example 1 only in that polyethylene is used instead of ethylene-octene copolymer, while the other substances, amounts and preparation methods are the same as those in Preparation Example 1.

[0057] Examples 1-5 and Comparative Examples 1-4 Examples 1-5 and Comparative Examples 1-4 each provide a polyolefin wear-resistant material, the components of which are shown in Table 1. In Table 1, the amount of each component is in "parts by weight". Table 1 The preparation methods of the polyolefin abrasion-resistant materials provided in Examples 1-5 and Comparative Examples 1-4 include the following steps: (1) Add styrene elastomer and mineral oil to a mixer in the proportions shown in Table 1, and stir for 10 min at 40°C and 1500 r / min to obtain a mixture; (2) The thermoplastic polyurethane elastomer, compatibilizer, polyolefin, filler and antioxidant are mixed in the proportions in Table 1 and added to a mixer. The mixture is stirred for 15 min at 40°C and 1500 r / min. The mixed material is then fed into a twin-screw extruder through an automatic feeding system for extrusion plasticization. The wear-resistant material extruded through the twin-screw die is subsequently subjected to strip cooling, pelletizing, air drying and packaging to obtain the polyolefin wear-resistant material. The twin-screw extruder comprises four zones connected in sequence: Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9, Zone 10, and Zone 11. The temperature of Zone 1 is 85℃, Zone 2 is 130℃, Zone 3 is 160℃, Zone 4 is 170℃, Zone 5 is 185℃, Zone 6 is 195℃, and Zones 7 through 11 are all 200℃.

[0058] Performance testing: (1) Melt index: Tested according to the method provided in GB / T 1033.1-2008; (2) Tensile strength and elongation at break: The test shall be conducted in accordance with the method provided in GB / T 1040.3-2006 (Type 5 dumbbell specimen); (3) Oxidation induction period at 200℃: The test was conducted according to the method provided in GB / T 19466.6-2009; (4) Mortar wear rate: Tested according to the method provided in SH / T 1818-2017.

[0059] The polyolefin abrasion-resistant materials provided in Examples 1-5 and Comparative Examples 1-4 were tested according to the above test methods. The test results are shown in Table 2. Table 2 According to the data in Table 2: The mortar wear rate of the polyolefin abrasives provided in Examples 1-5 is only 0.18-0.33%, which shows excellent wear resistance. All other properties meet the requirements of relevant standards and satisfy the application needs. The polyolefin abrasive provided in Example 1 has the best wear resistance.

[0060] Compared with Example 1, the polyolefin abrasives provided in Comparative Examples 1 to 4 all had higher mortar wear rates, indicating that their abrasion resistance was poor.

[0061] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A polyolefin abrasion-resistant material, characterized in that, The polyolefin abrasion-resistant material comprises the following components in parts by weight: 10-50 parts by weight of polyolefin; 10-30 parts by weight of styrene-based elastomers; 20-40 parts by weight of thermoplastic polyurethane elastomer; 10-20 parts by weight of mineral oil; Compatibilizer 10-20 parts by weight; The compatibilizer is obtained by initiating free radicals through an initiator, which then promotes the grafting of the grafted monomers to the main chain of the ethylene-octene copolymer.

2. The polyolefin abrasion-resistant material according to claim 1, characterized in that, The polyolefin includes polyethylene and / or ethylene-octene copolymer; Preferably, the number-average molecular weight of the styrene elastomer is ≥300,000; Preferably, the styrene-based elastomer is a star-shaped resin.

3. The polyolefin abrasion-resistant material according to claim 1 or 2, characterized in that, The thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer; Preferably, the mineral oil includes white oil and / or naphthenic oil.

4. The polyolefin abrasion-resistant material according to any one of claims 1 to 3, characterized in that, The grafting rate of the compatibilizer is 0.5% to 1%; Preferably, the initiator comprises 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane; Preferably, the grafting monomer comprises glycidyl methacrylate.

5. The polyolefin abrasion-resistant material according to any one of claims 1 to 4, characterized in that, The polyolefin abrasion-resistant material also includes fillers; Preferably, the filler content in the polyolefin abrasion-resistant material is 0.1 to 2 parts by weight; Preferably, the filler comprises any one or a combination of at least two of titanium dioxide, talc, calcium carbonate, silica, or polytetrafluoroethylene powder.

6. The polyolefin abrasion-resistant material according to any one of claims 1 to 5, characterized in that, The polyolefin abrasion-resistant material also includes antioxidants; Preferably, the antioxidant content in the polyolefin abrasion-resistant material is 0.1 to 0.5 parts by weight; Preferably, the antioxidant comprises any one or a combination of at least two of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butyl)phosphite, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, or 2,6-di-tert-butyl-p-cresol.

7. A method for preparing the polyolefin abrasion-resistant material according to any one of claims 1 to 6, characterized in that, The preparation method includes the following steps: (1) Styrene-based elastomers and mineral oil are mixed to obtain a mixture; (2) The mixture obtained in step (1), thermoplastic polyurethane elastomer, compatibilizer, polyolefin, optional filler and optional antioxidant are mixed, and then extruded, plasticized, stretched and water-cooled and pelletized to obtain the polyolefin wear-resistant material.

8. The preparation method according to claim 7, characterized in that, The mixing temperature in step (1) is 30~50℃, and the time is 5~10 min; Preferably, the mixing in step (1) is carried out under stirring conditions with a rotation speed of 1000~1500 r / min.

9. The preparation method according to claim 7 or 8, characterized in that, The mixing temperature in step (2) is 30~50℃, and the time is 10~20 min; Preferably, the mixing in step (2) is carried out under stirring conditions with a rotation speed of 1000~1500 r / min; Preferably, the extrusion plasticizing in step (2) is carried out in a twin-screw extruder; Preferably, the twin-screw extruder includes a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone, a seventh zone, an eighth zone, a ninth zone, a tenth zone, and an eleventh zone connected in sequence. The temperature of the first zone is 80~90℃, the temperature of the second zone is 120~140℃, the temperature of the third zone is 150~170℃, the temperature of the fourth zone is 160~180℃, the temperature of the fifth zone is 180~190℃, the temperature of the sixth zone is 190~200℃, and the temperature of the seventh to eleventh zones is 195~200℃.

10. The application of a polyolefin abrasion-resistant material as described in any one of claims 1 to 6 in a pipeline.

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