Pressure-resistant and wear-resistant polymer alloy, tailing conveying hose and manufacturing method

Abstract

The invention belongs to the technical field of tailing conveying pipes, and particularly relates to a pressure-resistant and wear-resistant polymer alloy, a tailing conveying hose and a manufacturing method. The polymer alloy is prepared from a modified thermoplastic polyurethane elastomer. The modified thermoplastic polyurethane elastomer is prepared from the following materials in parts by weight: 70 to 100 parts of polyether type thermoplastic polyurethane elastomer, 30 to 50 parts of thermoplastic polyester elastomer, 15 to 25 parts of chlorinated polyethylene and 10 to 20 parts of ABS (Acrylonitrile Butadiene Styrene) terpolymer. A polyester fiber woven layer is used as an inner layer, a modified thermoplastic polyurethane elastomer is used as an inner layer and an outer layer, and the tailing conveying hose is prepared by adopting a permeation co-extrusion method. The hose has the advantages of being resistant to pressure and abrasion, light in weight, not prone to scaling, convenient to disassemble, good in terrain adaptability and suitable for serving as a tailing conveying hose.

Description

Technical Field

[0001] The invention belongs to the technical field of tailings conveying pipes, and in particular relates to a pressure-resistant and wear-resistant polymer alloy and a tailings conveying hose and a manufacturing method. Background Art

[0002] The tailings slurry discharged from non-ferrous metal beneficiation and ferrous metal beneficiation has high abrasiveness and corrosiveness and needs to be transported to the tailings pond for storage. At present, the mainstream transportation method in China is to use a pressure pump station for pressurization, and use a tailings conveying pipe for long-distance transportation. After reaching the tailings pond, it is discharged through a branch pipeline. This tailings conveying pipe is a special pipe that combines the characteristics of pressure resistance, wear resistance, corrosion resistance, and impact resistance. The tailings conveying pipes currently used include steel pipes, high-density polyethylene pipes (HDPE), ceramic composite pipes, ultra-high molecular weight polyethylene pipes, and wire mesh skeleton polyethylene composite pipes.

[0003] This type of pipeline is expensive and bulky, and its transportation, disassembly and maintenance costs are high. After the design life of the tailings pond is reached, it is difficult to recycle its branch pipeline. For example, the steel tailings conveying pipe has a high abrasion rate due to its poor corrosion resistance, and it is also prone to scaling of the pipe wall. HDPE has better corrosion resistance to water and acids, alkalis and salts than steel, but its abrasion rate is still no better than that of steel tailings conveying pipes. Ultra-high molecular weight polyethylene (UHMWPE) has good self-lubricating properties, so it has wear resistance, but poor impact resistance. Therefore, steel tailings conveying pipes are still the mainstream. In real scenarios, tailings conveying pipes are very easy to wear and corrode, resulting in problems such as short pipeline life and high replacement frequency. You Wei et al. reported the problem of severe wear of steep slope tailings conveying pipelines, but the solution adopted was "avoiding the entry of ore blocks into the tailings, reducing the pipe diameter and other transformation measures" (You Wei, Ma Binjie, Cui Changzhi. Countermeasures for wear of tailings pipes in steep slope sections. Modern Mining, 2009). In addition, steel pipes are heavy, pose safety risks and have high transportation costs; they are connected by flanges or welding, and the length of a single pipe is short, which makes installation troublesome and labor-intensive; they are fixed in position and lack flexibility and mobility; they are affected by complex terrain, and the construction and installation workload is large. The tortuous ground and fault changes can easily damage the pipeline laying, causing production safety risks; when the tailings pond is full, it is difficult to recycle, and the subsequent maintenance process is complicated and costly. The UHMWPE lining has a low extrusion rate and low output.

[0004] It is generally believed that the mixing of thermoplastic polyester elastomer (TPU) and thermoplastic polyester elastomer (TPEE) will reduce the wear resistance of thermoplastic polyurethane elastomer. Currently, there are few studies on thermoplastic polyester elastomer and thermoplastic polyester elastomer polymer alloys, and the research on the application of such polymer alloys in tailings conveying pipes is still blank.

[0005] In the study of TPU blends, TPU is usually used as an auxiliary material rather than a matrix. Among them, TPU and ABS terpolymer [a terpolymer of three monomers: acrylonitrile A, butadiene (B), and styrene (S)] have been proven to be able to be blended in any ratio and produce a synergistic effect. The wear resistance, toughness, and low-temperature performance of the material can be improved, and the oil resistance is also significantly improved. Yang Jianjun and others found that the comprehensive performance is best when TPU accounts for 5-20% of the blend. The urethane bonds in TPU are unstable and easily degraded, resulting in poor thermal stability. Studies have shown that chlorinated polyethylene (CPE) can inhibit thermal degradation and improve the thermal stability of TPU. However, it leads to a decrease in the mechanical properties of the alloy. Chu Wenjuan conducted a relatively in-depth study on TPEE / TPU alloys. The research found that in TPEE / TPU alloy, when TPU is polyether TPU, the material strength increases first and then decreases with the increase of TPU content, and the best strength is when the TPU weight is 20 parts (Chu Wenjuan. Preparation and structure and performance research of high-strength TPEE / TPU plastic alloy. Master's thesis of Beijing University of Chemical Technology, 2010).

[0006] In order to overcome the shortcomings of existing tailings conveying pipes such as poor wear resistance, easy corrosion, complex replacement and high replacement cost, in addition to adding tailings screening procedures or changing pipe diameters, modifying the pipe materials of tailings conveying pipes may be a more thorough, effective and convenient strategy. Summary of the invention

[0007] In view of the above technical problems, the purpose of the present invention is to provide a polymer alloy suitable for use as the inner wall of a tailings conveying pipe; further provide a tailings conveying hose, and provide a method for preparing the tailings conveying hose. The inventor has conducted extensive research on the materials and preparation methods of tailings conveying pipes, and conducted experimental tests and tailings field tests, and obtained a tailings conveying hose that is pressure-resistant, wear-resistant, and corrosion-resistant and easy to install and disassemble (lightweight and bendable), which can be used to replace existing tailings conveying pipes, and is particularly suitable as a branch discharge pipeline for connection and replacement as needed.

[0008] To achieve the above object, the scheme of the present invention is as follows:

[0009] First, the present invention provides a pressure-resistant and wear-resistant polymer alloy. The polymer alloy is made of a modified thermoplastic polyurethane elastomer with a thermoplastic polyurethane elastomer as a matrix; the modified thermoplastic polyurethane elastomer is made of materials including the following materials in parts by weight: 70 to 100 parts of polyether thermoplastic polyurethane elastomer, 30 to 50 parts of thermoplastic polyester elastomer, 15 to 25 parts of chlorinated polyethylene, and 10 to 20 parts of ABS terpolymer.

[0010] Preferably, in order to improve the weather resistance and other properties of the tailings conveying pipe, the preparation materials of the modified thermoplastic polyurethane elastomer also include the following materials in weight ratio: 2-4 parts of hydrolysis stabilizer, 2-5 parts of antioxidant, 4-6 parts of antifriction agent, 0.5-1 part of weathering agent; 0.2-0.5 parts of heat stabilizer. Further preferably, the hydrolysis stabilizer is KSJ-936 (i.e., polymeric carbodiimide), the antioxidant is antioxidant 1010 [i.e., tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester], the antifriction agent is molybdenum disulfide (industrial grade), the weathering agent is light stabilizer 119 (CAS No.: 106990-43-6), and the heat stabilizer is BASF Irganox245.

[0011] In a preferred embodiment, the modified thermoplastic polyurethane elastomer is made of the following materials in parts by weight: 75 parts of polyether thermoplastic polyurethane elastomer, 30 parts of thermoplastic polyester elastomer; 16 parts of chlorinated polyethylene, 12 parts of ABS terpolymer, 2 parts of hydrolysis stabilizer, 2 parts of antioxidant, 4 parts of wear reducer, 0.5 parts of weathering agent, and 0.2 parts of heat stabilizer.

[0012] In a preferred embodiment, the modified thermoplastic polyurethane elastomer is made of the following materials in parts by weight: 85 parts of polyether thermoplastic polyurethane elastomer, 35 parts of thermoplastic polyester elastomer; 20 parts of chlorinated polyethylene, 16 parts of ABS terpolymer, 2.5 parts of hydrolysis stabilizer, 2.5 parts of antioxidant, 5 parts of wear reducer, 0.7 parts of weathering agent, and 0.3 parts of heat stabilizer.

[0013] In a preferred embodiment, the modified thermoplastic polyurethane elastomer is made of the following materials in parts by weight: 90 parts of polyether thermoplastic polyurethane elastomer, 45 parts of thermoplastic polyester elastomer; 25 parts of chlorinated polyethylene, 20 parts of ABS terpolymer, 4 parts of hydrolysis stabilizer, 4 parts of antioxidant, 6 parts of wear reducer, 1 part of weathering agent, and 0.5 parts of heat stabilizer.

[0014] Secondly, the present invention provides a tailings conveying hose, which is prepared using the aforementioned pressure-resistant and wear-resistant polymer alloy. The tailings conveying hose consists of an inner lining layer, an intermediate layer and an outer layer. The intermediate layer is a polyester fiber braided layer, and the inner lining layer and the outer layer are made of the modified thermoplastic polyurethane elastomer.

[0015] Preferably, the method for preparing the tailings conveying hose comprises the following steps:

[0016] S1 middle layer preparation: select polyester fiber to weave the middle layer as the belt blank;

[0017] S2 co-extrusion hose: the strip blank is placed on the outside of the inner mold of the penetration co-extrusion equipment and placed in the outer mold; the extruder is heated to a temperature of 190-210°C; a modified thermoplastic polyurethane elastomer is added for penetration co-extrusion to form the inner layer and the outer layer of the hose. Preferably, in step S1, the middle layer texture is a forward double twill; the weft fiber is 3000D aramid fiber with a weaving density of 24.5 strands / 10cm; the warp fiber is 6000D aramid fiber with a weaving density of 601 strands / 10cm.

[0018] Further preferably, the step S2 further comprises the following steps:

[0019] S21: drying polyether type thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, chlorinated polyethylene, and ABS terpolymer in an oven respectively; premixing polyether type thermoplastic polyurethane elastomer and thermoplastic polyester elastomer to obtain mixture A; premixing chlorinated polyethylene and ABS terpolymer to obtain mixture B;

[0020] S22: mixing a hydrolysis stabilizer, a friction reducing agent, an antioxidant and a heat stabilizer in a powdering machine to obtain a mixture C;

[0021] S23: adding mixture A and mixture C into a powdering machine, heating and mixing, and then adding a weathering agent and mixing to obtain mixture D;

[0022] S24: Add the mixture D to a twin-screw extruder granulator, add the mixture B from a side feed port, and granulate to obtain a modified thermoplastic polyurethane elastomer.

[0023] Preferably, in step S21, the pre-mixed polyether-type thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, chlorinated polyethylene, and ABS terpolymer are placed in an oven at 90° C. and dried for 4 hours.

[0024] Wherein, preferably, in step S22, the mixing temperature of the hydrolysis stabilizer, the friction reducer, the antioxidant and the heat stabilizer is 40° C., the mixing speed is 400 rpm, and the time is 25 min.

[0025] Among them, preferably, in step S23, before adding the weathering agent, the mixing temperature of mixture A and mixture C is 40°C, the mixing stirring speed is 400 rpm, and the time is 25 min; after adding the weathering agent, the mixing temperature is 40°C, the mixing stirring speed is 500 rpm, and the time is 10 min.

[0026] Among them, preferably, in step S24, the twin-screw extrusion temperature is set to: zone 1 temperature 160°C, zone 2 temperature 170°C, zone 3 temperature 175°C, zone 4 temperature 180°C, zone 5 temperature 185°C, zone 6 temperature 190°C, zone 7 temperature 195°C, zone 8 temperature 200°C, zone 9 temperature 205°C, and die head temperature 210°C.

[0027] The pressure-resistant and wear-resistant polymer alloy and tailings conveying hose of the present invention have at least the following advantages:

[0028] 1. The inner and outer layers of the hose are made of modified TPU, which has better abrasion resistance and corrosion resistance than steel pipes and other plastic pipes;

[0029] 2. The inner wall of the hose is smooth and not easy to scale, and the pipeline transportation friction is low;

[0030] 3. The hose has good flexibility and light weight. It can withstand large angle bending during construction and use. In the actual construction process, it can effectively reduce the impact of pipeline bending and drop caused by terrain undulations and surface faults;

[0031] 4. The pipe material has a low heat transfer coefficient and good insulation performance. The maximum operating temperature can reach 60°C, and no other anti-corrosion and insulation materials are needed;

[0032] 5. The construction is simple, fast and convenient, which improves the construction efficiency of tailings conveying pipeline. The length of a single pipeline can reach more than 1 km. Through the quick connector connection, the welding process can be omitted, which saves human resources, shortens the construction period, and facilitates later maintenance and recycling;

[0033] 6. Easy to transport and store, the bending radius can generally be controlled within 1.5m, and the transportation cost is low. It has very ideal advantages for slurry transportation pipelines with a length of about 10km and has very significant engineering application significance. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific embodiments. It should be understood that the specific embodiments are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0035] The materials and equipment used in the following examples are as follows:

[0036] (1) Thermoplastic polyurethane elastomer TPU uses Shanghai Yidan 5088AL polyether type, with performance requirements of hardness 88A, tensile strength>40MPa, elongation>485%, tear strength>120KN / M, density 1.10±0.04g / cm3, melting temperature 180~230℃;

[0037] (2) Thermoplastic polyester elastomer TPEE uses Shanghai Yidan HP4041, with a hardness of 40D, tensile strength>25MPa, elongation>500%, tear strength>80KN / m, bending modulus>60Mpa, density 1.16g / cm3, melting temperature 180-210°C, and shrinkage rate 0.6%;

[0038] (3) Chlorinated polyethylene CPE uses Tianteng PE-C130, with a chlorine content of about 30%, a hardness of less than 65A, a thermal decomposition temperature of 165°C, a tensile strength of 6 to 8MPa, a mass fraction of volatile matter, less than 0.4%, and a mass fraction of ash less than 4.5%;

[0039] (4) ABS terpolymer uses Chimei PA-777D, with a melt index of 5.5g / 10min and a density of 1.06g / cm 3 , yield strength 45MPa, heat deformation temperature 115℃;

[0040] (5) The hydrolysis stabilizer is selected from polymeric carbodiimide Raine KSJ-936, with a density of about 0.95 g / cm3 and a viscosity of about 16 to 24 mPa.s;

[0041] (6) The friction reducer is industrial grade molybdenum disulfide, with a particle size of 325 mesh, neutral pH, component content MoS2 ≥ 98.5%, and a density of 4.5 g / cm 3 ;

[0042] (7) Antioxidant: pentaerythritol ester: antioxidant 1010, content ≥ 98.0%, volatile matter ≤ 0.5%, ash ≤ 0.1%;

[0043] (8) The weathering agent uses high molecular weight triazine-piperidine condensate particles: light stabilizer 119, absorption wavelength> 300nm, melting point 115~150℃, with the characteristics of low volatility, migration resistance, high temperature resistance, etc., and can be used in weak acidic environment;

[0044] (9) Heat stabilizer: BASF Irganox 245, which is odorless, low volatile, and highly resistant to extraction. The preferred molecular weight is 586.8, the melting point range is 76-79°C, and the specific gravity is 1.14 g / cm 3 .

[0045] Example 1 Preparation of pressure-resistant and wear-resistant polymer alloy (modified TPU particles)

[0046] Table 1 Material list for the preparation of pressure-resistant and wear-resistant polymer alloys (parts by weight)

[0047] materials Ingredients 1 Ingredients 2 Ingredients 3 TPU 75 servings 85 copies 90 servings TPEE 30 servings 35 servings 45 servings CPE 16 servings 20 servings 25 servings ABS 12 servings 16 servings 20 servings Hydrolysis Stabilizer 2 servings 2.5 servings 4 servings Antioxidants 2 servings 2.5 servings 4 servings Friction reducer 4 servings 5 servings 6 servings Weathering agent 0.5 serving 0.7 parts 1 serving Heat Stabilizer 0.2 parts 0.3 parts 0.5 serving

[0048] According to the ingredients in Table 1, take the materials and prepare them. The steps are as follows:

[0049] TPU, TPEE, CPE and ABS were placed in an oven at 90°C and dried for 4 hours respectively; TPU and TPEE were premixed to obtain mixture A; CPE and ABS were premixed to obtain mixture B.

[0050] The hydrolysis stabilizer, the antifriction agent, the antioxidant and the heat stabilizer were mixed in a small high-speed powder mill (Zhangjiagang Beifa Machinery SRLZ100 / 200) at a mixing speed of 400 rpm, a mixing temperature of 40° C. and a mixing time of 25 min to prepare a mixture C;

[0051] The dried mixture A and mixture C were added from the feeding port to a small high-speed powder mill (Zhangjiagang Beifa Machinery SRLZ100 / 200) for high-speed mixing, the temperature was set at 40°C, and the mixture was mixed for 25 minutes. Finally, the weathering agent was added from the feeding port and mixed at 500 rpm for 10 minutes to obtain a mixture D.

[0052] Step S4: Add the mixture D to a twin-screw extruder granulator (Nanjing Ruiya TSE-20 / 600-5.5-48), add the mixture B from the side feed port, and granulate to obtain modified TPU particles.

[0053] The twin-screw extrusion temperature is set as follows: zone 1 temperature 160°C, zone 2 temperature 170°C, zone 3 temperature 175°C, zone 4 temperature 180°C, zone 5 temperature 185°C, zone 6 temperature 190°C, zone 7 temperature 195°C, zone 8 temperature 200°C, zone 9 temperature 205°C, and die head temperature 210°C.

[0054] Example 2 Preparation of tailings conveying hose

[0055] The three pressure-resistant and wear-resistant polymer alloys of Example 1 (ie, the three modified TPU particles finally prepared) were used to prepare tailings conveying hoses respectively.

[0056] Braided tape blank:

[0057] The middle layer is woven with polyester filament fiber, and the texture is forward twill. Among them, the weft can be double weft specification 3000D, twist S6, and the design weaving density is 22 bundles / 10cm; the warp can be double warp specification 3000D, twist S12, and the design weaving density is 390 bundles. The folding width is 480±1mm, and the plug diameter is 309±0.5mm.

[0058] 3. Co-extrusion hose:

[0059] The hose was produced by percolation coextrusion using commercially available dies.

[0060] Specifically, the obtained modified TPU particles are dried, the strip blank is sleeved on the outside of the inner mold of the penetration co-extrusion equipment and placed in the outer mold, the heated extruder extrudes the modified TPU through the extruder, and then penetrates into the strip blank and the inner mold. When the inner mold is filled with the infiltrated modified TPU, the infiltrated modified TPU overflows from the through hole of the strip blank, and the overflowed modified TPU forms the inner layer of the hose under the extrusion of the inner mold and the strip blank. Further, the modified TPU is extruded to the outside of the strip blank through the extruder, and the modified TPU outside the strip blank forms the outer layer of the hose under the extrusion of the strip blank and the outer mold. Thus, the modified TPU is formed as the inner layer and outer layer of the hose, and the strip blank infiltrated with the modified TPU is used as the hose middle layer hose.

[0061] The drying temperature of the modified TPU particles is preferably 90°C to 100°C, and the drying time is preferably 4 hours. The modified TPU particles have good stability within the range of 90°C to 100°C. However, ordinary technicians in this field can increase or decrease the drying temperature as needed, such as decreasing the drying temperature to extend the drying time.

[0062] The extrusion temperature of the extruder is preferably 190° C. to 210° C. Within this temperature range, the modified TPU particles have good stability and are in a flowable state, which is convenient for thermoplastic processing.

[0063] Example 3 Performance test of tailings conveying hose

[0064] The co-extruded hose prepared in Example 2 was used as a test sample, and the ring tube abrasion simulation test was used to test the ring tube abrasion parameters of the test sample for 600 hours.

[0065] 1. Samples and Preparation

[0066] The following comparative tailings conveying hose was prepared according to the methods of Examples 1 and 2 (i.e., the strip blank layer was the same as that of the example):

[0067] Comparative Example 1: TPU tailings conveying hose

[0068] This comparative example does not use TPEE, CPE, and ABS. The proportions of TPU, hydrolysis stabilizer, antioxidant, antifriction agent, weathering agent, and heat stabilizer are the same as those of ingredient 3 in Table 1 of Example 1.

[0069] Comparative Example 2: TPU+CPE tailings conveying hose

[0070] This comparative example does not use TPEE and ABS. The proportions of TPU, CPE, hydrolysis stabilizer, antioxidant, antifriction agent, weathering agent and heat stabilizer are the same as those of ingredient 3 in Table 1 of Example 1.

[0071] Comparative Example 3: TPU+ABS tailings conveying hose

[0072] This comparative example does not use TPEE, CPE, TPU, ABS, hydrolysis stabilizer, antioxidant, wear reducer, weathering agent, and heat stabilizer. The material ratio is the same as ingredient 3 in Table 1 of Example 1.

[0073] 2. Test methods and indicators

[0074] Preparation of ore pulp: The raw ore from the same source is crushed and ground, and the particle size of the ore sample is less than 2mm, and the error is less than 5%. The ore sample with qualified fineness is mixed with water in proportion to form a slurry with a weight concentration of 65%, and CaO (because lime is used as an adjuster in the ore dressing process) is added to adjust the slurry pH value to 8.2 to obtain the tailings slurry for testing.

[0075] Annular pipe circulation wear test: The tailings conveying pipe is connected to the annular pipe circulation wear test device through a flange transfer. After the tailings slurry is stirred evenly in the stirring tank, the slurry pump is turned on to conduct the annular pipe circulation wear test.

[0076] In order to maintain the stability of the sample particle size composition and eliminate the error caused by particle size changes in the abrasion test, the initial test time is 60 hours. After the test, the particle size composition and particle shape changes are analyzed to determine the time of each test. Under the condition of single particle size and single flow rate, no less than five independent repeated tests are carried out.

[0077] The test parameters are shown in Table 2.

[0078] Table 2 Annular tube cyclic wear test parameters

[0079]

[0080] Each test is conducted and the operating data are recorded: slurry concentration C, slurry flow rate Q, slurry temperature T. The data are measured and recorded every four hours. After each experiment, the slurry is sampled for particle size analysis.

[0081] The amount of abrasion is determined by weighing. The test specimen connected in series in the ring tube is removed after a specified period of operation and abrasion, and then cleaned of dirt and dried to a constant weight, and weighed using a precision electronic analytical balance.

[0082] Soaking and strength test: Use the tailings slurry as the soaking liquid; test the samples to be tested. Test the initial tensile strength of all samples by tensile testing machine in advance, take four months (120 days) as the soaking cycle, take a sample every one month (30 days) to test the tensile strength, and record the strength change.

[0083] Table 3 Strength and changes of delivery pipe samples

[0084]

[0085]

[0086] Table 4 Strength and changes of the conveying pipe samples in the ring pipe abrasion simulation test

[0087]

[0088] As shown in Tables 3 and 4, the three-layer hose prepared with ingredients 1-3 in Example 1 has higher initial strength and strength after immersion for 120 days than the three-layer hose in the comparative example, and is more wear-resistant.

Claims

1. A pressure-resistant and wear-resistant polymer alloy, characterized in that: The polymer alloy is made of modified thermoplastic polyurethane elastomer with thermoplastic polyurethane elastomer as the matrix; the modified thermoplastic polyurethane elastomer is made of materials including the following materials in parts by weight: 70-100 parts of polyether thermoplastic polyurethane elastomer, 30-50 parts of thermoplastic polyester elastomer, 15-25 parts of chlorinated polyethylene, and 10-20 parts of ABS terpolymer.

2. A pressure-resistant and wear-resistant polymer alloy according to claim 1, characterized in that: The modified thermoplastic polyurethane elastomer preparation materials also include the following materials in weight ratio: 2-4 parts of hydrolysis stabilizer, 2-5 parts of antioxidant, 4-6 parts of friction reducer, 0.5-1 part of weathering agent; and 0.2-0.5 part of heat stabilizer.

3. A pressure-resistant and wear-resistant polymer alloy according to claim 2, characterized in that: The hydrolysis stabilizer is KSJ-936, the antioxidant is antioxidant 1010, the wear reducer is molybdenum disulfide, the weathering agent is light stabilizer 119, and the heat stabilizer is BASF Irganox 245.

4. The pressure-resistant and wear-resistant polymer alloy according to claim 2, characterized in that: The modified thermoplastic polyurethane elastomer is made of the following materials in parts by weight: 75 parts of polyether thermoplastic polyurethane elastomer, 30 parts of thermoplastic polyester elastomer; 16 parts of chlorinated polyethylene, 12 parts of ABS terpolymer, 2 parts of hydrolysis stabilizer, 2 parts of antioxidant, 4 parts of wear reducer, 0.5 parts of weathering agent, and 0.2 parts of heat stabilizer.

5. The pressure-resistant and wear-resistant polymer alloy according to claim 2, characterized in that: The modified thermoplastic polyurethane elastomer is made of the following materials in parts by weight: 85 parts of polyether thermoplastic polyurethane elastomer, 35 parts of thermoplastic polyester elastomer; 20 parts of chlorinated polyethylene, 16 parts of ABS terpolymer, 2.5 parts of hydrolysis stabilizer, 2.5 parts of antioxidant, 5 parts of wear reducer, 0.7 parts of weathering agent, and 0.3 parts of heat stabilizer.

6. The pressure-resistant and wear-resistant polymer alloy according to claim 2, characterized in that: The modified thermoplastic polyurethane elastomer is made of the following materials in parts by weight: 90 parts of polyether thermoplastic polyurethane elastomer, 45 parts of thermoplastic polyester elastomer; 25 parts of chlorinated polyethylene, 20 parts of ABS terpolymer, 4 parts of hydrolysis stabilizer, 4 parts of antioxidant, 6 parts of wear reducer, 1 part of weathering agent, and 0.5 parts of heat stabilizer.

7. A tailings conveying hose comprising a pressure-resistant and wear-resistant polymer alloy as claimed in any one of claims 1 to 6, characterized in that: The tailings conveying hose consists of an inner lining layer, a middle layer and an outer layer, the middle layer is a polyester fiber braided layer, and the inner lining layer and the outer layer are made of the modified thermoplastic polyurethane elastomer.

8. The method for preparing the tailings conveying hose according to claim 7, characterized in that: The steps include: S1 middle layer preparation: select polyester fiber to weave the middle layer as the belt blank; S2 co-extrusion hose: The strip blank is placed outside the inner mold of the permeation co-extrusion equipment and placed in the outer mold; The extruder is heated to a temperature of 190-210° C. The modified thermoplastic polyurethane elastomer is added for penetration co-extrusion to form a hose inner layer and a hose outer layer.

9. The method for preparing the tailings conveying hose according to claim 8, characterized in that: The step S2 further comprises the following steps: S21: drying polyether type thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, chlorinated polyethylene, and ABS terpolymer in an oven respectively; premixing polyether type thermoplastic polyurethane elastomer and thermoplastic polyester elastomer to obtain mixture A; premixing chlorinated polyethylene and ABS terpolymer to obtain mixture B; Step S22: mixing the hydrolysis stabilizer, the friction reducing agent, the antioxidant and the heat stabilizer in a powder grinder to obtain a mixture C; Step S23: adding mixture A and mixture C into a powdering machine, heating and mixing, and then adding a weathering agent and mixing to obtain mixture D; Step S24: Add the mixture D to a twin-screw extruder granulator, add the mixture B from a side feed port, and granulate to obtain a modified thermoplastic polyurethane elastomer.

10. The method for preparing the tailings conveying hose according to claim 9, characterized in that: In the step S1, the middle layer texture is selected as forward double twill; the weft fiber is selected as 3000D aramid fiber with a weaving density of 24.5 strands / 10cm; the warp fiber is selected as 6000D aramid fiber with a weaving density of 601 strands / 10cm.

11. The method for preparing a tailings conveying hose according to claim 9, characterized in that: In the step S21, the pre-mixed polyether-type thermoplastic polyurethane elastomer, thermoplastic polyester elastomer, chlorinated polyethylene, and ABS terpolymer are placed in an oven at 90° C. and dried for 4 hours.

12. The method for preparing a tailings conveying hose according to claim 9, characterized in that: In step S22, the mixing temperature of the hydrolysis stabilizer, the friction reducing agent, the antioxidant and the heat stabilizer is 40° C., the mixing speed is 400 rpm, and the time is 25 min.

13. The method for preparing a tailings conveying hose according to claim 9, characterized in that: In step S23, before adding the weathering agent, the mixing temperature of mixture A and mixture C is 40° C., the mixing stirring speed is 400 rpm, and the time is 25 min; after adding the weathering agent, the mixing temperature is 40° C., the mixing stirring speed is 500 rpm, and the time is 10 min.

14. The method for preparing a tailings conveying hose according to claim 9, characterized in that: In step S24, the twin-screw extrusion temperature is set to: zone 1 temperature 160°C, zone 2 temperature 170°C, zone 3 temperature 175°C, zone 4 temperature 180°C, zone 5 temperature 185°C, zone 6 temperature 190°C, zone 7 temperature 195°C, zone 8 temperature 200°C, zone 9 temperature 205°C, and die head temperature 210°C.

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