High-corrosion-resistance and high-wear-resistance polyolefin drainage and blow-off pipeline material and preparation method thereof

Abstract

The invention discloses a high-corrosion-resistance and high-wear-resistance polyolefin drainage and blow-off pipeline material and a preparation method thereof, and relates to the technical field of pipeline materials, the pipeline material adopts a three-layer composite structure, and the three-layer composite structure sequentially comprises a reinforced polyolefin outer layer, a functional transition layer and a wear-resistant and corrosion-resistant inner layer from outside to inside. The pipeline material adopts a three-layer layered design, the outer layer provides stable supporting strength, the function transition layer strengthens interlayer combination, the wear-resistant and corrosion-resistant inner layer focuses core protection, and all the materials work synergistically, so that the effect of optimizing corrosion resistance and wear resistance at the same time is achieved, and the problems that the performance of an existing single material is short, and the cost is low are effectively solved. The problems of corrosion damage, abrasion, leakage and the like of the pipeline in a complex sewage environment are prevented, long-term stable operation of a drainage and pollution discharge system is guaranteed, and the method successfully adapts to use scenes such as chemical wastewater and mine drainage which have strict requirements on material performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline materials, in particular to a high-corrosion-resistant and high-wear-resistant polyolefin drainage and sewage pipeline material and a preparation method thereof. BACKGROUND

[0002] Polyethylene is referred to as "HDPE" for short, HDPE is a kind of thermoplastic resin with high crystallinity and non-polarity, the original state of HDPE is milky white, and the thin section is translucent to a certain extent, PE has excellent resistance to most of the characteristics of living and industrial chemicals, the polyolefin drainage and sewage pipeline is a new type of drainage and sewage pipeline made of polyolefin resin as basic material, through modification treatment (such as adding activated rigid particles, grafting elastomer, etc.) and combining with steel belt reinforcing structure, its outer wall is provided with spiral steel belt reinforcing rib, has the characteristics of high strength, corrosion resistance, etc., and is suitable for drainage and sewage system in municipal, building and other fields.

[0003] At present, due to poor corrosion resistance of concrete pipe and steel pipe, it is easy to be eroded by sewage chemical substances or electrochemical corrosion, leading to structural deterioration, although HDPE pipe is resistant to corrosion, but it is insufficient in sand-containing sewage, the wear rate is fast, the glass steel pipe is weak in impact resistance and poor in environmental protection, and it cannot adapt to the complex sewage conveying environment with high corrosion and high wear at the same time, resulting in that the finished pipeline is easy to appear corrosion damage, wear and leakage or delamination in actual use, the service life is greatly shortened, frequent maintenance and replacement are needed, not only the engineering operation and maintenance cost is increased, but also the stable operation of the drainage and sewage system is seriously affected, and it is difficult to meet the long-term use demand in harsh scenes such as chemical wastewater and mine drainage. SUMMARY

[0004] In view of the defects of the prior art, the present application provides a high-corrosion-resistant and high-wear-resistant polyolefin drainage and sewage pipeline material and a preparation method thereof, which solves the problems mentioned in the background art.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a high-corrosion-resistant and high-wear-resistant polyolefin drainage and sewage pipeline material, characterized in that: the pipeline material adopts a three-layer composite structure, from outside to inside, it is reinforced polyolefin outer layer, functional transition layer and wear-resistant and corrosion-resistant inner layer in sequence; The reinforced polyolefin outer layer comprises, by mass percentage: polyolefin matrix 80%-85%, basalt fiber 3%-5%, calcium carbonate 2%-4%, silane coupling agent 2%-3%, antioxidant 1%-2%, lubricant 1%-2%, colorant 0.5%-1%; The functional transition layer comprises, by mass percentage: maleic anhydride grafted polyolefin 60%-70%, ethylene-vinyl acetate copolymer 20%-30% and organic titanium coupling agent 3%-5%; The wear-resistant and corrosion-resistant inner layer comprises, by mass percentage, polyurethane elastomer 80-85%, alumina ceramic powder 5-8%, graphene 1-2%, hydroxyl-containing alkoxyl silicone oligomer 3-5%, and wear-resistant agent 2-3%.

[0006] Preferably, the polyolefin matrix is a high-crystallinity and high-density polyolefin, the crystallinity of the polyolefin matrix is ≥ 85%, and the melt index of the polyolefin matrix is 0.5-2.0 g / 10 min.

[0007] Preferably, the basalt fiber has a length of 1-3 mm and a diameter of 10-20 μm; the calcium carbonate is nano-sized calcium carbonate, the particle size of the calcium carbonate is 50-100 nm, and the surface of the calcium carbonate is modified with stearic acid.

[0008] Preferably, the alumina ceramic powder is specifically nano-sized alumina ceramic powder, the particle size of the alumina ceramic powder is 20-50 nm, the graphene is single-layer graphene, the flake size of the graphene is 0.5-5 μm, and the thickness of the graphene is 0.34-1.0 nm.

[0009] Preferably, the antioxidant is one or a mixture of both of antioxidant 1010 and antioxidant 1076, the lubricant is one or a mixture of both of zinc stearate and ethylene bis-stearamide, and the wear-resistant agent is polytetrafluoroethylene micro powder, the particle size of the wear-resistant agent being 1-5 μm.

[0010] Preferably, the grafting rate of the maleic anhydride grafted polyolefin is 0.8%-1.5%, and the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 25%-35%.

[0011] A preparation method of a high-corrosion-resistance and high-wear-resistance polyolefin drainage and sewage pipeline material and a pipeline finished product, the preparation method of the pipeline material and the pipeline comprising: S1, the basalt fiber is soaked in a solution of the silane coupling agent for 1-2 h, then dried at a temperature of 100°C for 2 h for pretreatment, the calcium carbonate and the alumina ceramic powder are dried at a temperature of 100-120°C for 3-4 h respectively, and the water content is controlled to be less than 0.1%; S2, the reinforced polyolefin outer layer is granulated: the polyolefin matrix, the pretreated basalt fiber, the pretreated calcium carbonate, the premix, the antioxidant, the lubricant, and the colorant are put into a conical twin-screw extruder, and then subjected to staged temperature control, melt extrusion, and cooling and granulation to obtain reinforced polyolefin outer layer granules; S3, the functional transition layer granulation: the maleic anhydride grafted polyolefin, the ethylene-vinyl acetate copolymer, the organic titanium coupling agent are put into a conical twin-screw extruder, melt extrusion is carried out at the temperature of 150-175 DEG C, cooling granulation is carried out, and functional transition layer granules are obtained; S4, the wear-resistant anticorrosion inner layer granulation: the polyurethane elastomer, the pretreated alumina ceramic powder, the graphene, the hydroxyl-containing alkoxyl organosilicon oligomer and the wear-resistant agent are put into a conical twin-screw extruder, melt extrusion is carried out in stages, cooling granulation is carried out, and wear-resistant anticorrosion inner layer granules are obtained; S5, the reinforced polyolefin outer layer granules, the functional transition layer granules and the wear-resistant anticorrosion inner layer granules are added to corresponding hoppers of a three-layer co-extrusion pipeline extruder, and extrusion molding is carried out, and after the reinforced polyolefin outer layer granules, the functional transition layer granules and the wear-resistant anticorrosion inner layer granules are extruded in three layers from outside to inside, the pipeline is obtained after cooling, traction and cutting.

[0012] Preferably, the temperature distribution of the conical twin-screw extruder for the reinforced polyolefin outer layer granulation is as follows: 1 zone 160 DEG C, 2 zone 165 DEG C, 3 zone 170 DEG C, 4 zone 175 DEG C, 5 zone 180 DEG C, 6 zone 185 DEG C, 7 zone 195 DEG C and 8 zone 190 DEG C, the feeding speed is 10-20 r / min, the main machine current is 50-55 A, the melt pressure is 20-25 MPa, the cooling water temperature is 0-10 DEG C, and the flow rate is 8-12 t / h.

[0013] Preferably, the temperature distribution of the conical twin-screw extruder for the wear-resistant anticorrosion inner layer granulation is as follows: 1 zone 155 DEG C, 2 zone 160 DEG C, 3 zone 165 DEG C, 4 zone 170 DEG C, 5 zone 175 DEG C, 6 zone 180 DEG C, 7 zone 185 DEG C and 8 zone 180 DEG C, the feeding speed is 15-25 r / min, the main machine current is 45-50 A, the melt pressure is 18-22 MPa, the cooling water temperature is 0-10 DEG C, and the flow rate is 8-12 t / h.

[0014] Preferably, the barrel temperature of the three-layer co-extrusion pipeline extruder is 160-195 DEG C, the die temperature is 190-200 DEG C, the traction speed is 0.5-1.5 m / min, the head of the pipeline extruder adopts a gradually changing flow channel design, including an inner layer, a transition layer and an outer layer, and the interface fusion temperature of the inner layer and the transition layer and the transition layer and the outer layer is 175-185 DEG C.

[0015] The application provides a high-corrosion-resistance and high-wear-resistance polyolefin drainage and sewage pipeline material and a preparation method thereof. (1) The pipeline material adopts a three-layer design, the outer layer provides stable support strength, the functional transition layer strengthens the interlayer bonding, the wear-resistant and corrosion-resistant inner layer focuses on core protection, and each layer of material cooperates to achieve the effect of simultaneously optimizing corrosion resistance and wear resistance, effectively avoiding the performance short board of single material, preventing corrosion damage, wear and leakage and other problems in complex sewage environment, ensuring long-term stable operation of the drainage and sewage system, and successfully adapting to harsh material performance requirements in chemical wastewater, mine drainage and other use scenarios.

[0016] (2) Through three-layer targeted material combination and structure optimization, the single material design which easily leads to performance conflict is abandoned, and the integrity of the overall structure of the pipeline and the ability to resist environmental interference are strengthened, the stability and anti-deterioration ability of the pipeline structure are improved, the maintenance and replacement frequency caused by delamination and structural failure of the pipeline is reduced, the actual use cycle of the pipeline is prolonged, the labor and material costs of long-term operation and maintenance of the project are reduced, the influence of frequent maintenance on the continuous operation of the drainage and sewage system is avoided, and the use reliability and comprehensive benefit of the overall project are improved.

[0017] (3) Each layer of material is free of toxic and harmful ingredients, and through the design of a multi-layer stacked structure, it meets the use requirements in high corrosion, high wear and complex geological conditions, and takes into account the environmental protection and working condition adaptability, which not only does not cause additional burden to the environment during production or use, but also fully meets the use requirements of different harsh drainage and sewage scenes, widens the application range of the pipeline, provides a safe and reliable solution for various complex sewage conveying projects, realizes the unity of engineering practicability and environmental protection, and improves the comprehensive value of engineering construction. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The material and pipeline preparation steps block diagram of the high corrosion-resistant and high wear-resistant polyolefin drainage and sewage pipeline material and its preparation method. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0020] Please refer to Figure 1The application provides a high-corrosion-resistance and high-wear-resistance polyolefin drainage and sewage pipeline material and a preparation method thereof, and achieves the above object through the following technical scheme. The reinforced polyolefin outer layer comprises, in percentage by mass, 80-85% of a polyolefin matrix, 3-5% of basalt fibers, 2-4% of calcium carbonate, 2-3% of a silane coupling agent, 1-2% of an antioxidant, 1-2% of a lubricant and 0.5-1% of a colorant. The functional transition layer comprises, in percentage by mass, 60-70% of maleic anhydride grafted polyolefin, 20-30% of ethylene-vinyl acetate copolymer and 3-5% of an organic titanium coupling agent. The wear-resistance and corrosion-resistance inner layer comprises, in percentage by mass, 80-85% of a polyurethane elastomer, 5-8% of alumina ceramic powder, 1-2% of graphene, 3-5% of a hydroxyl-containing alkoxyl organosilicon oligomer and 2-3% of a wear-resistance agent.

[0021] The polyolefin matrix is a high-crystallinity and high-density polyolefin, the crystallinity of the polyolefin matrix is greater than or equal to 85%, and the melt index of the polyolefin matrix is 0.5-2.0 g / 10 min.

[0022] The basalt fibers have a length of 1-3 mm and a diameter of 10-20 μm; the calcium carbonate is nano calcium carbonate, has a particle size of 50-100 nm and is modified on the surface with stearic acid.

[0023] The alumina ceramic powder is nano alumina ceramic powder, has a particle size of 20-50 nm; the graphene is single-layer graphene, has a sheet size of 0.5-5 μm and a thickness of 0.34-1.0 nm.

[0024] The antioxidant is one or a mixture of two of antioxidant 1010 and antioxidant 1076; the lubricant is one or a mixture of two of zinc stearate and ethylene bis-stearamide; and the wear-resistance agent is polytetrafluoroethylene micro powder, has a particle size of 1-5 μm.

[0025] The grafting rate of the maleic anhydride grafted polyolefin is 0.8-1.5%, and the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 25-35%.

[0026] The application further provides a preparation method of the high-corrosion-resistance and high-wear-resistance polyolefin drainage and sewage pipeline material and a pipeline finished product. S1, basalt fibers are soaked in a solution of silane coupling agent for 1-2 hours, then dried at a temperature of 100℃ for 2 hours for pretreatment, and then calcium carbonate and alumina ceramic powder are dried at a temperature of 100-120℃ for 3-4 hours, with a water content controlled below 0.1%; S2, the outer layer of reinforced polyolefin is granulated: the polyolefin matrix, the pretreated basalt fibers, the pretreated calcium carbonate, the premix, the antioxidant, the lubricant and the colorant are put into a conical twin-screw extruder, and then subjected to staged temperature control, melt extrusion, cooling and granulation to obtain the outer layer of reinforced polyolefin particles; S3, the functional transition layer is granulated: the maleic anhydride grafted polyolefin, the ethylene-vinyl acetate copolymer and the organic titanium coupling agent are put into a conical twin-screw extruder, and then subjected to melt extrusion at a temperature of 150-175℃, cooling and granulation to obtain the functional transition layer particles; S4, the inner layer of wear-resistant and corrosion-resistant layer is granulated: the polyurethane elastomer, the pretreated alumina ceramic powder, the graphene, the hydroxyl-containing alkoxyl organosilicon oligomer and the wear-resistant agent are put into a conical twin-screw extruder, and then subjected to staged temperature control, melt extrusion, cooling and granulation to obtain the inner layer of wear-resistant and corrosion-resistant particles; S5, the outer layer of reinforced polyolefin particles, the functional transition layer particles and the inner layer of wear-resistant and corrosion-resistant particles are added to corresponding hoppers of a three-layer co-extrusion pipe extruder for extrusion molding, and then subjected to cooling, traction and cutting to obtain the pipe.

[0027] The temperature distribution of the conical twin-screw extruder for the outer layer of reinforced polyolefin granulation is as follows: zone 1 160℃, zone 2 165℃, zone 3 170℃, zone 4 175℃, zone 5 180℃, zone 6 185℃, zone 7 195℃ and zone 8 190℃, the feeding speed is 10-20r / min, the main motor current is 50-55A, the melt pressure is 20-25MPa, the cooling water temperature is 0-10℃ and the flow rate is 8-12t / h.

[0028] The temperature distribution of the conical twin-screw extruder for the inner layer of wear-resistant and corrosion-resistant granulation is as follows: zone 1 155℃, zone 2 160℃, zone 3 165℃, zone 4 170℃, zone 5 175℃, zone 6 180℃, zone 7 185℃ and zone 8 180℃, the feeding speed is 15-25r / min, the main motor current is 45-50A, the melt pressure is 18-22MPa, the cooling water temperature is 0-10℃ and the flow rate is 8-12t / h.

[0029] The barrel temperature of the three-layer co-extrusion pipe extruder is 160-195℃, the die temperature is 190-200℃, the traction speed is 0.5-1.5m / min, the head of the pipe extruder adopts a gradually changing flow channel design, including an inner layer, a transition layer and an outer layer, and the interface fusion temperature of the inner layer and the transition layer, and the transition layer and the outer layer is 175-185℃.

[0030] Example 1 The pipe material includes the following raw materials: The reinforced polyolefin outer layer: high crystallinity high density polyolefin matrix (crystallinity 88%, melt index 1.2 g / 10 min) 82%, basalt fiber (length 2 mm, diameter 15 μm) 4%, nano calcium carbonate (particle size 80 nm, surface modified with stearic acid) 3%, silane coupling agent KH-560 2.5%, antioxidant 1010 and antioxidant 1076 mixed at a ratio of 1:1 1.5%, zinc stearate 1.5%, colorant carbon black 0.5%.

[0031] The functional transition layer: maleic anhydride grafted polyolefin (grafting rate 1.2%) 65%, ethylene-vinyl acetate copolymer (vinyl acetate mass content 30%) 27%, organic titanium coupling agent 4%.

[0032] The wear-resistant and corrosion-resistant inner layer: polyurethane elastomer 82%, nano alumina ceramic powder (particle size 35 nm) 7%, single-layer graphene (flake diameter 2 μm, thickness 0.5 nm) 1.5%, hydroxyl-containing alkoxyl silicone oligomer 4.5%, polytetrafluoroethylene micro powder (particle size 3 μm) 3%; The pipe material and the method for preparing the pipe product: S1: The basalt fiber is soaked in a 4% silane coupling agent KH-560 solution for 1.5 h and then dried at 100℃ for 2 h; the nano calcium carbonate and the nano alumina ceramic powder are dried at 110℃ for 3.5 h respectively, and the water content is controlled at 0.08%.

[0033] S2: The reinforced polyolefin outer layer is granulated by using a conical twin-screw extruder, with the barrel temperature being 160℃ in zone 1, 165℃ in zone 2, 170℃ in zone 3, 175℃ in zone 4, 180℃ in zone 5, 185℃ in zone 6, 195℃ in zone 7, and 190℃ in zone 8, the feeding speed being 15 r / min, the main motor current being 52 A, the melt pressure being 22 MPa, the cooling water temperature being 5℃, and the flow rate being 10 t / h; The functional transition layer is granulated by using a conical twin-screw extruder, with the barrel temperature being 160℃, and the melt extrusion cooling granulation is performed; the wear-resistant and corrosion-resistant inner layer is granulated by using a conical twin-screw extruder, with the barrel temperature being 155℃ in zone 1, 160℃ in zone 2, 165℃ in zone 3, 170℃ in zone 4, 175℃ in zone 5, 180℃ in zone 6, 185℃ in zone 7, and 180℃ in zone 8, the feeding speed being 20 r / min, the main motor current being 48 A, the melt pressure being 20 MPa, the cooling water temperature being 5℃, and the flow rate being 10 t / h.

[0034] S3: The three kinds of granules are added into the corresponding hoppers of a three-layer co-extrusion pipe extruder, with the barrel temperature being 180℃ and the die temperature being 195℃, the pulling speed being 1.0 m / min, the die head being designed as a gradually changing flow channel, the interface fusion temperature being 180℃, and the finished product pipe being obtained through cooling, pulling, and cutting.

[0035] Example 2 The difference from Example 1 is that the proportion of polyolefin matrix in the reinforced polyolefin outer layer is adjusted to 80%, the proportion of basalt fiber is increased to 5%, and the remaining raw material components and preparation process are consistent with Example 1.

[0036] Example 3 The difference from Example 1 is that the proportion of nano-aluminum oxide ceramic powder in the wear-resistant and corrosion-resistant inner layer is adjusted to 5%, the proportion of polyurethane elastomer is increased to 84%, and the remaining raw material components and preparation process are consistent with Example 1.

[0037] Example 4 The difference from Example 1 is that the proportion of maleic anhydride grafted polyolefin in the functional transition layer is adjusted to 70%, the proportion of ethylene-vinyl acetate copolymer is reduced to 23%, and the remaining raw material components and preparation process are consistent with Example 1.

[0038] Example 5 The difference from Example 1 is that the proportion of silane coupling agent in the reinforced polyolefin outer layer is adjusted to 2%, the proportion of antioxidant mixture is increased to 2%, and the remaining raw material components and preparation process are consistent with Example 1.

[0039] Comparative Example 1 The difference from Example 1 is that a double-layer structure is used, the functional transition layer is removed, the mass proportion of the reinforced polyolefin outer layer is 75%, the mass proportion of the wear-resistant and corrosion-resistant inner layer is 25%, the proportion of each layer component remains unchanged, the remaining raw material components are consistent with Example 1, the functional transition layer granulation step is omitted in the preparation process, and the reinforced polyolefin outer layer particles and the wear-resistant and corrosion-resistant inner layer particles are directly double-layer co-extruded, and the remaining process parameters are consistent with Example 1.

[0040] Comparative Example 2 The difference from Example 1 is that the reinforced polyolefin outer layer does not contain basalt fiber, the proportion of polyolefin matrix is adjusted to 86%, and the proportion of the remaining raw material components remains unchanged, and the preparation process is consistent with Example 1.

[0041] Comparative Example 3 The difference from Example 1 is that the wear-resistant and corrosion-resistant inner layer does not contain graphene, the proportion of hydroxyl alkoxy organosilicon oligomer is adjusted to 6%, and the proportion of the remaining raw material components is the same as Example 1, and the preparation process is consistent with Example 1.

[0042] Test Example Corrosion resistance test (oxidation induction time test): 10mg±0.1mg of sample was cut from the finished pipeline prepared in Examples 1-5 and Comparative Examples 1-3, and after removing surface impurities, it was placed in a DSC aluminum crucible and sealed; The crucible was placed in a differential scanning calorimeter, and heated to 210°C at a rate of 10°C / min under nitrogen atmosphere, then switched to oxygen atmosphere, and kept the temperature constant. The time from switching to oxygen atmosphere to the appearance of the obvious exothermic peak of oxidation was recorded, which was the oxidation induction period (unit: min). Each sample was tested in triplicate, and the average value was taken as the final result.

[0043] Wear resistance test (friction coefficient test): A 50mm x 50mm sample was cut from the inner wall of the finished pipe prepared in Examples 1-5 and Comparative Examples 1-3, and the sample surface roughness was calibrated with a surface roughness tester (to ensure uniform initial roughness). The sample was fixed on the lower sample stage of the friction and wear tester, and a 45# steel ball (diameter 5mm) was used as the upper friction pair. A normal pressure of 5N was applied, and the sliding speed was set to 100mm / min with a sliding distance of 500m. The friction force change was recorded in real time during the test, and the average friction coefficient was calculated. Each sample was tested in triplicate, and the average value was taken as the final result.

[0044] Table 1 is the corrosion and wear resistance test results of the polyolefin drainage and sewage pipe ; Interlayer bonding force test (interlayer peeling strength test): A 25mm wide and 150mm long strip sample was cut from the finished pipe prepared in Examples 1-5 and Comparative Examples 1-3, and a 50mm initial peeling opening was carefully cut along the interlayer interface with a knife to ensure that only the target interlayer (outer layer and transition layer, transition layer and inner layer) was separated without damaging the body of each layer. The separated ends of the sample were fixed on the upper and lower clamps of the universal material testing machine, and the tensile speed was set to 50mm / min. The sample was continuously stretched until it was completely peeled off, and the maximum peeling force during the stretching process was recorded. The interlayer peeling strength (unit: N / mm) was calculated according to the peeling force and the width of the sample. Each sample was tested in triplicate, and the average value was taken as the final result.

[0045] Structural stability test (compressive strength test): A 300mm long pipe sample was cut from the finished pipe prepared in Examples 1-5 and Comparative Examples 1-3, and the ends were sealed with end plates to ensure that the sample axis was consistent with the loading direction of the pressure testing machine. A radial pressure was applied to the pipe at a loading rate of 2mm / min, and the pressure and displacement changes were recorded in real time. When the sample showed obvious plastic deformation (displacement reached 5% of the pipe diameter) or cracking, the maximum pressure value at that time was recorded. The compressive strength (unit: MPa) was calculated according to the pipe outer diameter, wall thickness and maximum pressure. Each sample was tested in triplicate, and the average value was taken as the final result.

[0046] Table II is the test result of the structural performance of the polyolefin drainage and sewerage pipeline ; According to Table I and Table II, it can be seen that: The test results show that the performance of each of Examples 1-5 is significantly better than that of Comparative Examples 1-3, wherein Example 1 is the optimal formula, and Example 1, with a reasonable three-layer composite structure ratio, precise material parameter selection, and complete preparation process, performs best in the four core indicators of oxidation induction period, friction coefficient, interlayer peeling strength, and compressive strength, reflecting the synergistic optimization effect of each component and process.

[0047] Examples 2-5 deviate from the optimal parameters of Example 1 due to only a single variable, and the performance is slightly decreased but still maintains a high level, proving the fault tolerance and stability of the formula and process of the present application; Comparative Example 1 has a significant decrease in interlayer peeling strength due to the lack of a functional transition layer, verifying the key role of the functional transition layer in interlayer bonding; Comparative Example 2 has a significant decrease in compressive strength due to the lack of basalt fibers, indicating the importance of basalt fibers in strengthening the pipeline structure; and Comparative Example 3 has a significant shortening of the oxidation induction period due to the lack of graphene, reflecting the core value of graphene in corrosion prevention and barrier; In summary, the three-layer composite structure design, key component collocation, and preparation process of the present application are synergistic, effectively solving the performance deficiency problem of existing pipelines and achieving the simultaneous improvement of corrosion resistance, wear resistance, interlayer bonding strength, and structural stability.

[0048] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application.

Claims

1. A highly corrosion-resistant and highly wear-resistant polyolefin drainage and sewage pipe material, characterized in that: The pipe material adopts a three-layer composite structure, consisting of an outer layer of reinforced polyolefin, a functional transition layer, and a wear-resistant and corrosion-resistant inner layer from the outside to the inside. The reinforced polyolefin outer layer comprises, by weight percentage: 80%-85% polyolefin matrix, 3%-5% basalt fiber, 2%-4% calcium carbonate, 2%-3% silane coupling agent, 1%-2% antioxidant, 1%-2% lubricant, and 0.5%-1% colorant; The functional transition layer comprises, by weight percentage: 60%–70% maleic anhydride-grafted polyolefin, 20%–30% ethylene-vinyl acetate copolymer, and 3%–5% organotitanium coupling agent; The wear-resistant and corrosion-resistant inner layer comprises, by weight percentage: 80%-85% polyurethane elastomer, 5%-8% alumina ceramic powder, 1%-2% graphene, 3%-5% hydroxyalkoxy-containing organosilicon oligomer, and 2%-3% wear-resistant agent.

2. The high corrosion resistance and high wear resistance polyolefin drainage and sewage pipe material according to claim 1, characterized in that: The polyolefin matrix is ​​a highly crystalline and high-density polyolefin, with a crystallinity ≥85% and a melt index of 0.5-2.0 g / 10 min.

3. The high corrosion resistance and high wear resistance polyolefin drainage and sewage pipe material according to claim 1, characterized in that: The basalt fiber has a length of 1-3 mm and a diameter of 10-20 μm; the calcium carbonate is nano-sized calcium carbonate with a particle size of 50-100 nm, and the surface of the calcium carbonate is modified with stearic acid.

4. The high corrosion resistance and high wear resistance polyolefin drainage and sewage pipe material according to claim 1, characterized in that: The alumina ceramic powder is specifically nano-alumina ceramic powder with a particle size of 20-50 nm. The graphene is single-layer graphene with a sheet diameter of 0.5-5 μm and a thickness of 0.34-1.0 nm.

5. The high corrosion resistance and high wear resistance polyolefin drainage and sewage pipe material according to claim 1, characterized in that: The antioxidant is one or a mixture of antioxidant 1010 and antioxidant 1076; the lubricant is one or a mixture of zinc stearate and ethylene bis-stearamide; the wear-resistant agent is polytetrafluoroethylene micro powder; and the particle size of the wear-resistant agent is 1-5 μm.

6. The high corrosion resistance and high wear resistance polyolefin drainage and sewage pipe material according to claim 1, characterized in that: The grafting rate of the maleic anhydride-grafted polyolefin is 0.8%–1.5%, and the mass content of vinyl acetate in the ethylene-vinyl acetate copolymer is 25%–35%.

7. A material and a method for preparing a high corrosion-resistant and high wear-resistant polyolefin drainage and sewage pipe material as described in any one of claims 1-6, characterized in that: The pipe material and the method for preparing the pipe include: S1. The basalt fiber is soaked in the solution of the silane coupling agent for 1-2 hours and then dried at 100°C for 2 hours for pretreatment. The calcium carbonate and the alumina ceramic powder are then dried at 100-120°C for 3-4 hours, and the moisture content is controlled below 0.1%. S2. Granulation of the reinforced polyolefin outer layer: The polyolefin matrix, the pretreated basalt fiber, the pretreated calcium carbonate, the premix, the antioxidant, the lubricant and the colorant are fed into a conical twin-screw extruder, and the mixture is melt-extruded in stages with controlled temperature, cooled and granulated to obtain reinforced polyolefin outer layer particles. S3. Granulation of the functional transition layer: The maleic anhydride-grafted polyolefin, the ethylene-vinyl acetate copolymer, and the organic titanium coupling agent are fed into a conical twin-screw extruder, melt-extruded at a temperature of 150-175°C, cooled and granulated to obtain functional transition layer particles. S4. Granulation of the wear-resistant and corrosion-resistant inner layer: The polyurethane elastomer, the pretreated alumina ceramic powder, the graphene, the hydroxyl alkoxy organosilicon oligomer and the wear-resistant agent are fed into a conical twin-screw extruder, and the extrusion is carried out in stages with controlled temperature, followed by cooling and granulation to obtain wear-resistant and corrosion-resistant inner layer particles. S5. The reinforced polyolefin outer layer particles, the functional transition layer particles, and the wear-resistant and corrosion-resistant inner layer particles are added to the corresponding hopper of the three-layer co-extrusion pipe extruder and extruded. The reinforced polyolefin outer layer particles, the functional transition layer particles, and the wear-resistant and corrosion-resistant inner layer particles are extruded in a three-layer composite manner from the outside to the inside, and then cooled, pulled, and cut to obtain the pipe.

8. The preparation method of a high corrosion-resistant and high wear-resistant polyolefin drainage and sewage pipe material and the finished pipe product according to claim 7, characterized in that: The barrel temperature distribution of the conical twin-screw extruder for granulating the outer layer of reinforced polyolefin is as follows: Zone 1 160℃, Zone 2 165℃, Zone 3 170℃, Zone 4 175℃, Zone 5 180℃, Zone 6 185℃, Zone 7 195℃, and Zone 8 190℃. The feeding speed is 10-20 r / min, the main motor current is 50-55A, the melt pressure is 20-25MPa, the cooling water temperature is 0-10℃, and the flow rate is 8-12 t / h.

9. The preparation method of a high corrosion-resistant and high wear-resistant polyolefin drainage and sewage pipe material and the finished pipe product according to claim 7, characterized in that: The temperature distribution of the conical twin-screw extruder barrel for the wear-resistant and corrosion-resistant inner layer granulation is as follows: Zone 1 155℃, Zone 2 160℃, Zone 3 165℃, Zone 4 170℃, Zone 5 175℃, Zone 6 180℃, Zone 7 185℃, and Zone 8 180℃. The feeding speed is 15-25 r / min, the main motor current is 45-50A, the melt pressure is 18-22MPa, the cooling water temperature is 0-10℃, and the flow rate is 8-12t / h.

10. The preparation method of a high corrosion-resistant and high wear-resistant polyolefin drainage and sewage pipe material and the finished pipe product according to claim 7, characterized in that: The barrel temperature of the three-layer co-extrusion pipe extruder is 160-195℃, the die temperature is 190-200℃, and the traction speed is 0.5-1.5m / min. The die head of the pipe extruder adopts a gradient flow channel design, including an inner layer, a transition layer, and an outer layer. The interface fusion temperature between the inner layer and the transition layer, and between the transition layer and the outer layer, is 175-185℃.

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