Composite ore pulp conveying pipeline with POE (Polyolefin Elastomer) as wear-resistant layer and preparation method of composite ore pulp conveying pipeline

Abstract

The invention relates to the field of fiber reinforced composite materials, and particularly discloses a composite ore pulp conveying pipeline with POE as a wear-resistant layer and a preparation method thereof.The pipeline is of a four-layer composite structure and comprises the wear-resistant layer, a base layer, a reinforcing layer and an outer protective layer from inside to outside; the wear-resistant layer is composed of a POE elastomer; the base layer is formed by modified PE; the reinforcing layer is composed of a glass fiber belt; and the outer protective layer is made of PE. Wherein the wear-resistant layer has an excellent wear-resistant effect; the base layer provides supporting strength for the wear-resistant layer, the melting point problem of double-layer co-extrusion and the bonding force problem between the two layers are solved, and production and processing are convenient. On the basis, the reinforcing layer and the outer protective layer are compounded in sequence, so that impact and friction of coarse particle ore pulp on the inner wall of the pipeline under high pressure are reduced, the service life of the pipeline is prolonged, flowing of high-pressure slurry is facilitated, and the transportation efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of fiber-reinforced composite materials, and in particular relates to a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. Background Art

[0002] The origins of slurry pipeline transportation technology can be traced back to a US patent for coal slurry transportation in 1891. Early applications were primarily short-distance trials. It wasn't until 1957, when the first long-distance coal slurry pipeline (174 km long, 254 mm diameter) was completed in Ohio, USA, that slurry pipelines officially entered the industrial application stage. As an efficient and low-carbon transportation method, slurry pipelines have enormous potential in terms of efficiency and environmental protection. Their main application scenarios are as follows: ① Mining industry: slurry transportation in metal and non-metallic mines (such as tailings and sand and gravel); ② Petrochemical industry: transportation of drilling mud, crude oil, and chemical raw materials; ③ Water conservancy projects: transportation of river dredging mud; ④ Construction industry: transportation of concrete; ⑤ Environmental protection: sewage treatment and sludge transportation.

[0003] my country's slurry pipeline transportation technology started slowly, initially primarily used for tailings discharge. In the 1980s, influenced by foreign technology, research into high-concentration slurry transportation began. With technological advancements, my country has achieved significant results in the localization of equipment, facilities, and pipes. To reduce slurry wear on pipeline walls, researchers have conducted research on pipe wear resistance. Patent application CN119060445A discloses a wear-resistant polyolefin pipe lining material and a method for preparing the pipe. The lining material comprises polyolefin resin and silicone masterbatch. The silicone masterbatch, primarily composed of polysiloxane, serves as the sole modified filler. This reduces melt fracture during the product's processing and molding process, and increases the crosslink density of the polyolefin, making the material less susceptible to breakage under impact, bending, and friction. For example, patent application CN116144111 A discloses a wear-resistant and corrosion-resistant polypropylene steel-plastic composite pipe and its preparation method. This pipe includes a carbon steel pipe and a wear-resistant and corrosion-resistant polypropylene composite pipe compounded on the inner wall of the carbon steel pipe. The wear-resistant and corrosion-resistant polypropylene is modified by using a composite filler formed by compounding graphene, crystallized ceramic particles, and modified molybdenum disilicide to modify the resin system containing a compatibilizer, so that a dense passivated silica layer is formed inside the steel-plastic composite pipe, imparting excellent wear and corrosion resistance. Although the above patent application has improved the wear resistance of the pipe in different aspects, problems such as inner wall damage and pipe rupture still exist when facing the transportation of high-pressure coarse slurry. Summary of the Invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a slurry conveying pipeline with a four-layer composite structure. From the inside to the outside, the pipeline comprises a wear-resistant layer, a base layer, a reinforcement layer, and an outer protective layer. The innermost layer improves the wear resistance of the wear-resistant layer by polarity modification of grafted POE, rigidity enhancement of cycloolefin polymer, wear-resistant optimization of surface-treated silicon carbide, and mechanical reinforcement of wollastonite. For the base layer that provides support strength for the wear-resistant layer, the melting point problem of double-layer co-extrusion and the adhesion problem between the two layers are solved by changing the viscosity of the PE melt and introducing silicon dioxide, thereby facilitating production and processing. On this basis, by sequentially compounding the reinforcement layer and the outer protective layer, the impact and friction of the coarse-particle slurry on the inner wall of the pipeline under high pressure are reduced, the pipeline life is increased, the flow of high-pressure slurry is facilitated, and the transportation efficiency is improved.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: On one hand, the present invention provides a composite slurry conveying pipeline with POE as a wear-resistant layer. The pipeline has a four-layer composite structure, which, from the inside to the outside, comprises a wear-resistant layer, a base layer, a reinforcement layer, and an outer protective layer; the wear-resistant layer is composed of a POE elastomer; the base layer is composed of modified PE; the reinforcement layer is composed of a glass fiber tape; and the outer protective layer is composed of PE.

[0006] The present invention first extrudes the wear-resistant layer and the base layer into a tube, and then winds the glass fiber tape on the base layer, wherein the base layer provides support strength for the thinner wear-resistant layer, facilitating the subsequent winding of the glass fiber tape. At the same time, the glass fiber tape also significantly improves the pressure resistance of the pipeline.

[0007] In some embodiments, the POE elastomer is prepared as follows: S1, the grafting monomer, dicumyl peroxide and POE are mixed evenly, and melt-extruded at 150-190° C. to obtain double-grafted POE; S2. Add triethylamine to polymaleic acid, adjust the pH to 7.5-8.5, add silicon carbide powder after mixing and stirring, add anhydrous ethanol solution containing a silane coupling agent after stirring for 20-40 minutes, stir for 1-3 hours, collect the precipitate, wash and dry to obtain surface-treated silicon carbide; S3. Using a twin-screw extruder, melt-blend the double-grafted POE in step S1, cycloolefin polymer, surface-treated silicon carbide, wollastonite and zinc stearate in step S2 at 150-160° C. and 180-220 r / min, and extrude to obtain the POE elastomer.

[0008] In some embodiments, in step S1, the grafting monomer comprises 2-hydroxyethyl acrylate and maleic anhydride.

[0009] In a first aspect of the present invention, POE is grafted with 2-hydroxyethyl acrylate and maleic anhydride to improve the interaction between the polymer matrix and the inorganic filler. The anhydride group of maleic anhydride utilizes its strong polarity to bond to the inorganic filler through hydrogen bonds or covalent bonds; the hydroxyl group of 2-hydroxyethyl acrylate forms a hydrogen bond network with the filler surface, and the ester group enhances the interface bonding through van der Waals forces; and the introduction of 2-hydroxyethyl acrylate compensates for the problem of excessive polarity that may be caused by single maleic anhydride grafting, forming a multi-level interface effect, improving the interface bonding strength, and the strong interface bonding enables the load to be efficiently transferred from the matrix to the hard filler, reducing the wear caused by interface peeling and improving the wear resistance; further, the enhanced polarity of POE helps to strengthen the chemical bonding with PE, thereby reducing the risk of extrusion delamination. At the same time, the enhanced polarity can also absorb lubricating media such as water or oil in the slurry to reduce the friction coefficient.

[0010] In some embodiments, in step S2, the mass ratio of the polymaleic acid, silicon carbide powder and silane coupling agent is (1-5): (1-10): (1-2).

[0011] The present invention improves the wear resistance of the composite material by utilizing the high hardness of silicon carbide powder. Silicon carbide powder is first coated with polymaleic acid that is negatively charged after alkali treatment, and then a silane coupling agent is added to enrich the silane coupling agent on the surface of the silicon carbide powder, thereby increasing the effective collision between the silane coupling agent and the silicon carbide surface and improving the grafting rate of the silane coupling agent. This alleviates the problem of uneven dispersion of the silicon carbide material caused by self-polymerization of the silane coupling agent during the melt extrusion process.

[0012] In some embodiments, in step S3, the wear-resistant POE elastomer contains, by weight, 55 to 75 parts of double-grafted POE, 6 to 12 parts of cycloolefin polymer, 5 to 10 parts of surface-treated silicon carbide, 8 to 15 parts of wollastonite, and 0.5 to 1 part of zinc stearate.

[0013] The present invention achieves multi-component synergistic enhancement of mechanical properties while balancing costs through polarity modification of double-grafted POE, rigidity enhancement of cycloolefin polymer, wear resistance optimization of surface-treated silicon carbide, and mechanical reinforcement of wollastonite.

[0014] In some embodiments, the modified PE is prepared by the following steps: melt-blending PE, hexafluorobutyl methacrylate, and silicon dioxide at 140-160° C. for 10-30 min, and extruding to obtain the modified PE.

[0015] In some embodiments, the mass ratio of PE to hexafluorobutyl methacrylate is 1:(0.03-0.06).

[0016] In some embodiments, the mass ratio of PE to silicon dioxide is 1:(0.04-0.08).

[0017] The present invention introduces hexafluorobutyl methacrylate into PE to change the PE melt viscosity, making it close to the above-mentioned POE elastomer, solving the melting point problem of double-layer co-extrusion and facilitating production and processing; at the same time, the addition of silicon dioxide helps to form a fluorine-silicon synergistic reinforcement network, further improving the impact resistance of the pipeline, facilitating the flow of high-pressure slurry, and improving transportation efficiency; in addition, the optimization of PE also enhances the interfacial bonding strength with the POE elastomer, solving the adhesion problem between the wear-resistant layer and the base layer.

[0018] Another aspect of the present invention provides a method for preparing the composite slurry conveying pipeline with POE as a wear-resistant layer. The specific steps are as follows: co-extruding a POE elastomer and a modified PE to obtain an inner tube with a wear-resistant layer and a base layer distributed from the inside out; wrapping a glass fiber tape on the obtained inner tube in a flat and 45-65° circumferential direction using a winding machine to form a reinforcement layer; coating the surface of the reinforcement layer with PE to obtain an outer protective layer; and obtaining a composite slurry conveying pipeline with POE as a wear-resistant layer after cooling.

[0019] In some embodiments, the thickness of the wear-resistant layer is 2.5-5.0 mm, the thickness of the base layer is 2-14 mm, the thickness of the reinforcement layer is 0.6-6 mm; and the thickness of the outer protective layer is 2-10 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The composite slurry conveying pipeline provided by the present invention comprises, from the inside to the outside, a wear-resistant layer, a base layer, a reinforcement layer, and an outer protective layer. During preparation, the wear-resistant layer and the base layer are first compositely extruded into a tube, then a glass fiber tape is wound on the base layer, and finally an outer protective layer composed of thermoplastic PE is composited. The wear-resistant layer is composed of a POE elastomer, and the POE elastomer improves the wear resistance of the wear-resistant layer by polarity modification of grafted POE, rigidity enhancement of cycloolefin polymer, wear-resistant optimization of surface-treated silicon carbide, and mechanical reinforcement of wollastonite. The base layer is composed of modified PE, which provides support strength for the thinner wear-resistant layer and facilitates the subsequent winding of the glass fiber tape. Mainly by changing the PE melt viscosity and introducing silicon dioxide, the melting point problem of double-layer co-extrusion and the adhesion problem between the two layers are solved, and production and processing as well as the flow of high-pressure slurry are facilitated. Combined with the improved pressure resistance of the glass fiber tape, the impact and friction of coarse-particle slurry on the inner wall of the pipeline under high pressure are reduced, the pipeline life is increased, the flow of high-pressure slurry is facilitated, and the transportation efficiency is improved. DETAILED DESCRIPTION

[0021] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples are illustrative of the present invention and are intended only to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the scope of the present invention may be made without departing from the spirit or scope of the present invention.

[0022] It is worth noting that the raw materials used in the following preparation examples and embodiments, unless otherwise specified, were obtained from any commercially available manufacturer: The cycloolefin polymer model is E48R; The number average molecular weight of polymaleic acid is 750 ± 50; The particle size of silicon carbide powder is 10±2μm; Wollastonite is needle-shaped with an aspect ratio of 14±4:1; POE is ENGAGE™ 8480 polyolefin elastomer with an octene content of 20 wt% and an Mw of 94,500 g / mol; The particle size of silica is 500 ± 50 nm; The glass fiber tape was purchased from Chengzi Tainuo (Shandong) New Material Technology Co., Ltd., and the resin matrix was PE.

[0023] Preparation Example 1 The preparation steps of POE elastomer-A are as follows: S1. 4 g of 2-hydroxyethyl acrylate, 2 g of maleic anhydride, 0.3 g of dicumyl peroxide and 200 g of POE were mixed uniformly, and melt-extruded at 180° C. to obtain double-grafted POE; S2, triethylamine is added to 300g polymaleic acid, the pH is adjusted to 8, 1kg silicon carbide powder is added after mixing and stirring, 500g of anhydrous ethanol solution containing 100g KH550 is added after stirring for 30min, and the precipitate is collected after stirring for 2h, washed, and dried to obtain surface-treated silicon carbide; S3. By weight, 65 parts of the double-grafted POE prepared in step S1, 9 parts of cycloolefin polymer, 7 parts of the surface-treated silicon carbide prepared in step S2, 12 parts of wollastonite, and 0.7 parts of zinc stearate are melt-blended at 155° C. and 200 r / min using a twin-screw extruder, and extruded to obtain the POE elastomer-A.

[0024] Preparation Example 2 The preparation steps of POE elastomer-B are different from those of Preparation Example 1 in that: In step S1, maleic anhydride is replaced by an equal amount of 2-hydroxyethyl acrylate.

[0025] Preparation Example 3 The preparation steps of POE elastomer-C are different from those of Preparation Example 1 in that: In step S1, 2-hydroxyethyl acrylate is replaced by an equal amount of maleic anhydride.

[0026] Preparation Example 4 The preparation steps of POE elastomer-D are different from those of Preparation Example 1 in that: Step S2 is replaced by: stirring 1 kg of silicon carbide powder and 500 g of 20 wt% KH550 anhydrous ethanol solution for 2 h, collecting the precipitate, washing, and drying to obtain surface-treated silicon carbide.

[0027] Preparation Example 5 The preparation steps of POE elastomer-E are different from those of Preparation Example 1 in that: In step S3, the cycloolefin polymer is replaced by an equal amount of di-grafted POE-A.

[0028] Preparation Example 6 The preparation steps of POE elastomer-F are as follows: S1, triethylamine was added to 300g of polymaleic acid, the pH was adjusted to 8, 1kg of silicon carbide powder was added after mixing and stirring, and 500g of anhydrous ethanol solution containing 100g of KH550 was added after stirring for 30min. After stirring for 2h, the precipitate was collected, washed, and dried to obtain surface-treated silicon carbide; S2. By weight, 65 parts of POE, 9 parts of cycloolefin polymer, 7 parts of the surface-treated silicon carbide in step S2, 12 parts of wollastonite and 0.7 parts of zinc stearate were melt-blended at 155° C. and 200 r / min using a twin-screw extruder, and extruded to obtain the POE elastomer-F.

[0029] Preparation Example 7 The preparation steps of POE elastomer-G are as follows: S1. 4 g of 2-hydroxyethyl acrylate, 2 g of maleic anhydride, 0.3 g of dicumyl peroxide and 200 g of POE were mixed uniformly, and melt-extruded at 180° C. to obtain double-grafted POE; S2. By weight, 65 parts of the double-grafted POE prepared in step S1, 9 parts of cycloolefin polymer, 7 parts of silicon carbide powder, 12 parts of wollastonite and 0.7 parts of zinc stearate were melt-blended at 155° C. and 200 r / min using a twin-screw extruder, and extruded to obtain the POE elastomer-G.

[0030] Preparation Example 8 The preparation steps of modified PE-A are as follows: 1000 g of PE (high-density PE, model 8008H), 40 g of hexafluorobutyl methacrylate and 60 g of silica were melt-blended at 150° C. for 30 min and extruded to obtain modified PE-A.

[0031] Preparation Example 9 The preparation steps of modified PE-B are as follows: 1000 g of PE (high-density PE, model 8008H), 70 g of hexafluorobutyl methacrylate and 60 g of silica were melt-blended at 150° C. for 30 min and extruded to obtain modified PE-B.

[0032] Preparation Example 10 The preparation steps of modified PE-C are as follows: 1000 g of PE (high-density PE, model 8008H), 40 g of hexafluorobutyl methacrylate and 100 g of silica were melt-blended at 150° C. for 30 min and extruded to obtain modified PE-C.

[0033] Example 1 A composite slurry conveying pipeline with POE as the wear-resistant layer has a four-layer composite structure, consisting of a wear-resistant layer, a base layer, a reinforcement layer, and an outer protective layer from the inside to the outside; the wear-resistant layer is composed of POE elastomer-A; the base layer is composed of modified PE-A; the reinforcement layer is composed of glass fiber tape; and the outer protective layer is composed of PE (brand JHMGC100S).

[0034] The steps for preparing the composite slurry conveying pipeline in this embodiment are as follows: POE elastomer-A and modified PE-A are co-extruded to obtain an inner pipe with a wear-resistant layer with a thickness of 4mm and a base layer with a thickness of 5mm distributed from the inside to the outside. A glass fiber tape is wound on the obtained inner pipe in a flat and 55° circumferential direction using a winding machine to form a reinforcement layer with a thickness of 1.5mm; PE (brand JHMGC100S) is coated on the surface of the reinforcement layer to obtain an outer protective layer with a thickness of 4mm. After cooling, a composite slurry conveying pipeline with POE as the wear-resistant layer is obtained.

[0035] Example 2 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE elastomer-B.

[0036] Example 3 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE elastomer-C.

[0037] Example 4 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE elastomer-D.

[0038] Example 5 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE elastomer-E.

[0039] Example 6 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE elastomer-F.

[0040] Example 7 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE elastomer-G.

[0041] Example 8 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that modified PE-A is replaced by modified PE-B.

[0042] Example 9 This embodiment provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified PE-A is replaced by modified PE-C.

[0043] Comparative Example 1 This comparative example provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that POE elastomer-A is replaced by POE.

[0044] Comparative Example 2 This comparative example provides a composite slurry conveying pipeline with POE as a wear-resistant layer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified PE-A is replaced by PE (brand JHMGC100S).

[0045] Performance testing: 1. Friction and wear performance test: The interior of the pipes of Examples 1-9 and Comparative Examples 1-2 were tested according to the GB / T3960-2016 standard to obtain the wear amount.

[0046] 2. Impact strength test: refer to standard ISO 179-2.

[0047] 3. Interlayer bonding strength test: Test the bonding strength between the wear-resistant layer and the base layer with reference to the standard GB / T 14905-2009.

[0048] The results are shown in Table 1.

[0049] Table 1 It can be seen from the data in Table 1 that in Example 1, the pipeline as a whole has excellent impact resistance, and the wear resistance of the wear-resistant layer and the bonding strength between the wear-resistant layer and the base layer are good.

[0050] Compared with Example 1, the POE elastomer used in the wear-resistant layer in Examples 2-3 was grafted with only 2-hydroxyethyl acrylate and maleic anhydride, respectively. The interface bonding between the obtained single-grafted POE and the inorganic filler may be weakened, resulting in a decrease in wear resistance. Although the two have little effect on the impact strength, the bonding strength of Example 2 is reduced, which may be due to the reduction in polarity leading to a weakening of the chemical bond with PE; on this basis, combined with the ungrafted POE in Example 6, it was found that the wear resistance, impact resistance and bonding strength were further reduced.

[0051] Compared with Example 1, the POE elastomer used in the wear-resistant layer in Example 4 chose to directly add silane coupling agent when treating silicon carbide, which affected the wear resistance. The possible reason was that the silane coupling agent self-polymerized during the melt extrusion process, which led to uneven dispersion of the silicon carbide material. The silicon carbide in Example 7 was not treated, and the wear amount increased further, which may be due to the uneven distribution of silicon carbide.

[0052] Compared with Example 1, the POE elastomer used in the wear-resistant layer in Example 5 does not introduce cycloolefin polymer, which is not conducive to improving the wear resistance. The possible reason is that the high rigidity of cycloolefin polymer can compensate for part of the soft properties of POE elastomer, improve the overall hardness of the material, and improve the wear resistance.

[0053] Compared with Example 1, the modified PE used in Examples 8-9 changed the amount of hexafluorobutyl methacrylate and silicon dioxide, respectively, which had little effect on the wear and impact resistance, but was not conducive to interlayer bonding, resulting in reduced bonding strength.

[0054] Combining Example 1 and Comparative Example 1, it can be seen that the wear resistance of commercially available POE has a large room for improvement, and the bonding strength between the wear-resistant layer formed thereby and the base layer is poor; from Example 1 and Comparative Example 2, it can be seen that directly using commercially available PE as the base layer, although it has little effect on the wear resistance, is not conducive to the bonding between the two layers.

[0055] The embodiments and comparative examples described above do not impose any form of limitation on the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A composite slurry conveying pipeline with POE as wear-resistant layer, characterized in that: The pipeline is a four-layer composite structure, which includes a wear-resistant layer, a base layer, a reinforcement layer, and an outer protective layer from the inside to the outside; the wear-resistant layer is composed of POE elastomer; the base layer is composed of modified PE; the reinforcement layer is composed of glass fiber tape; and the outer protective layer is composed of PE.

2. The composite slurry conveying pipeline according to claim 1, characterized in that: The preparation steps of the POE elastomer are as follows: S1, the grafting monomer, dicumyl peroxide and POE are mixed evenly, and melt-extruded at 150-190° C. to obtain double-grafted POE; S2. Add triethylamine to polymaleic acid, adjust the pH to 7.5-8.5, add silicon carbide powder after mixing and stirring, add anhydrous ethanol solution containing a silane coupling agent after stirring for 20-40 minutes, stir for 1-3 hours, collect the precipitate, wash and dry to obtain surface-treated silicon carbide; S3. Using a twin-screw extruder, melt-blend the double-grafted POE in step S1, cycloolefin polymer, surface-treated silicon carbide, wollastonite and zinc stearate in step S2 at 150-160° C. and 180-220 r / min, and extrude to obtain the POE elastomer.

3. The composite slurry conveying pipeline according to claim 2, characterized in that: In step S1, the grafting monomer comprises 2-hydroxyethyl acrylate and maleic anhydride.

4. The composite slurry conveying pipeline according to claim 2, characterized in that: In step S2, the mass ratio of the polymaleic acid, silicon carbide powder and silane coupling agent is (1-5): (1-10): (1-2).

5. The composite slurry conveying pipeline according to claim 2, characterized in that: In step S3, the wear-resistant POE elastomer contains, by weight, 55 to 75 parts of double-grafted POE, 6 to 12 parts of cycloolefin polymer, 5 to 10 parts of surface-treated silicon carbide, 8 to 15 parts of wollastonite, and 0.5 to 1 part of zinc stearate.

6. The composite slurry conveying pipeline according to claim 1, characterized in that: The preparation steps of the modified PE are as follows: PE, hexafluorobutyl methacrylate and silicon dioxide are melt-blended at 140-160° C. for 10-30 minutes, and the modified PE is obtained by extrusion.

7. The composite slurry conveying pipeline according to claim 6, characterized in that: The mass ratio of the PE to hexafluorobutyl methacrylate is 1:(0.03-0.06).

8. The composite slurry conveying pipeline according to claim 6, characterized in that: The mass ratio of the PE to the silicon dioxide is 1:(0.04-0.08).

9. A method for preparing a composite slurry conveying pipeline according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: POE elastomer and modified PE are co-extruded to obtain an inner tube with a wear-resistant layer and a base layer distributed from the inside out; a glass fiber tape is wrapped around the obtained inner tube in a flat and 45-65° circumferential direction using a winding machine to form a reinforcement layer; PE is coated on the surface of the reinforcement layer to obtain an outer protective layer; after cooling, a composite slurry conveying pipeline with POE as the wear-resistant layer is obtained.

10. The method for preparing a composite slurry conveying pipeline according to claim 9, characterized in that: The thickness of the wear-resistant layer is 2.5-5.0 mm, the thickness of the base layer is 2-14 mm, the thickness of the reinforcement layer is 0.6-6 mm; and the thickness of the outer protective layer is 2-10 mm.

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