A high-strength basalt fiber drainage pipe and its production process

Abstract

The invention discloses a high-strength basalt fiber drainage pipe and a production process thereof, belonging to the field of drainage pipes. The invention discloses a high-strength basalt fiber drainage pipe and a production process thereof. The inner layer and the outer layer are both composited with basalt fiber reinforcement material and high-performance polyester resin. The basalt fiber has high strength characteristics and provides good structural strength for the drainage pipe. Then, a mixture of styrene-butadiene rubber and polyurethane is used in the middle layer to form a leak-proof self-healing polymer rubber layer, so that when it is pierced by foreign objects and leaks, it can automatically repair itself by utilizing the fluidity and high viscosity of the mixture, thereby enhancing the reliability and safety of the drainage pipe and reducing the probability of leakage of the drainage pipe. A cobalt chloride component is also added to the outer layer as a leakage detection component. When leakage occurs, the cobalt chloride at the leakage port will absorb water and change color, so that the leakage can be detected more intuitively, quickly and accurately, and the problem can be discovered and handled in a timely manner.

Description

Technical Field

[0001] The invention relates to the field of drainage pipes, and more specifically to a high-strength basalt fiber drainage pipe and a production process thereof. Background Art

[0002] In the field of modern drainage engineering, the performance requirements for drainage pipes are increasing day by day. Traditional drainage pipes often face many problems during use, such as insufficient strength and easy rupture, poor corrosion resistance resulting in a short service life, and difficult to detect leakage.

[0003] With the continuous advancement of science and technology, the research and development of new materials has brought new opportunities for the innovation of drainage pipes. As a high-performance inorganic fiber material, basalt fiber has excellent properties such as high strength, corrosion resistance, and high temperature resistance, and has broad application prospects in the field of drainage pipes. However, single basalt fiber materials still have limitations in some aspects, such as the lack of effective self-healing ability when dealing with leakage problems;

[0004] At the same time, in the process of using the drainage pipe, timely detection of leakage points is crucial to ensure the normal operation of the drainage system. The commonly used detection methods are often complicated and not intuitive enough. Therefore, the development of a new type of drainage pipe with high strength, good corrosion resistance, automatic leakage detection and self-repair function and its advanced production process has become an urgent problem to be solved in the current drainage engineering field. Therefore, we proposed a high-strength basalt fiber drainage pipe and its production process to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a high-strength basalt fiber drainage pipe and its production process, wherein both the inner and outer layers are composited with basalt fiber reinforced materials and high-performance polyester resins. The basalt fiber has high strength characteristics and provides good structural strength for the drainage pipe; then the middle layer uses a mixture of styrene-butadiene rubber and polyurethane to form a leak-proof self-healing polymer rubber layer, so that when it is pierced by foreign objects and leaks, it can automatically repair itself by utilizing the fluidity and high viscosity of the mixture, thereby enhancing the reliability and safety of the drainage pipe and reducing the probability of leakage of the drainage pipe; cobalt chloride is also added to the outer layer as a leakage detection component. When a leak occurs, the cobalt chloride at the leaking port will absorb water and change color, which can detect the leak more intuitively, quickly and accurately, and facilitate timely discovery and handling of the problem.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A high-strength basalt fiber drainage pipe, comprising an inner layer, an intermediate layer and an outer layer, wherein the inner layer is composited by a basalt fiber reinforcement material and a high-performance resin, wherein the basalt fiber reinforcement material is basalt fiber, and the basalt fiber is 25-40 parts by weight, and the high-performance resin is a high-temperature resistant and corrosion-resistant polyester resin, and the polyester resin is 30-45 parts by weight;

[0010] The middle layer is a leak-proof self-healing polymer rubber layer, which is a mixture of styrene-butadiene rubber and polyurethane, and the ratio of the mixed components is 2:1, which is 15-25 parts by weight;

[0011] The outer layer includes basalt fiber reinforcement material and high-performance resin, and also includes corrosion-resistant resin material, flame retardant, toughening agent and cobalt chloride as a component for detecting water leakage. The corrosion-resistant resin material is a polytetrafluoroethylene resin with excellent corrosion resistance, and the polytetrafluoroethylene resin is 30-40 parts by weight. The flame retardant is decabromodiphenyl ether, and the decabromodiphenyl ether is 20-25 parts by weight. The toughening agent is a styrene-butadiene-styrene block copolymer with good elasticity and processing properties, and the styrene-butadiene-styrene block copolymer is 5-10 parts by weight. The cobalt chloride is 10-14 parts by weight.

[0012] Furthermore, the diameter of the basalt fiber is 7-25 μm, and the length of the basalt fiber is 3-20 mm.

[0013] A high-strength basalt fiber drainage pipe production process comprises the following steps:

[0014] Step 1: preparing the inner layer material, pre-treating the basalt fiber, removing impurities and performing surface activation treatment, adding the basalt fiber and the polyester resin in proportion by weight into the first extruder, and extruding to obtain the inner layer tube blank;

[0015] Step 2: preparing the intermediate layer material, adding the mixture of styrene-butadiene rubber and polyurethane in parts by weight into the second extruder, and extruding the intermediate layer material onto the inner layer tube blank to form a composite tube blank with an intermediate layer;

[0016] Step 3: prepare the outer layer material, mix basalt fiber, polyester resin, polytetrafluoroethylene resin, decabromodiphenyl ether, styrene-butadiene-styrene block copolymer and cobalt chloride by weight, add them into the third extruder, extrude the outer layer material onto the composite tube blank with the middle layer, and form a three-layer high-strength basalt fiber drainage pipe;

[0017] Step 4: The extruded high-strength basalt fiber drainage pipe is cooled, sized and cut, and then quality tested to ensure that the product meets quality standards.

[0018] Furthermore, in the step 1, the pretreatment of the basalt fiber includes cleaning with a water-based fiber cleaning agent for 20-30 minutes, drying at a temperature of 50-70°C for 1-2 hours after cleaning, and then using plasma surface activation treatment for 30-45 minutes. Before the basalt fiber and the polyester resin are added to the first extruder, they must be premixed at a temperature of 60-70°C for 30-45 minutes to ensure the uniformity of the mixture.

[0019] Furthermore, in the step 2, before adding the mixture of styrene-butadiene rubber and polyurethane into the second extruder, it is necessary to pre-mix it at a temperature of 40-50° C. for 30-45 minutes to ensure the uniformity of the mixture.

[0020] Furthermore, in step three, before the outer layer material is added to the third extruder, it needs to be pre-mixed by a high-speed stirring device, with a stirring temperature of 60-70° C., a stirring speed of 800-1200 rpm, and a stirring time of 20-30 minutes to ensure that all ingredients are fully mixed.

[0021] Furthermore, the extrusion temperature of the first extruder is 180-220°C and the pressure is 5-8MPa, the extrusion temperature of the second extruder is 150-180°C and the pressure is 4-6MPa, and the extrusion temperature of the third extruder is 160-200°C and the pressure is 10-12MPa.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] (1) In this scheme, both the inner and outer layers are made of basalt fiber reinforced materials and high-performance polyester resin. Basalt fiber has high strength characteristics, which provides good structural strength for the drainage pipe. Then the middle layer uses a mixture of styrene-butadiene rubber and polyurethane to form a leak-proof self-healing polymer rubber layer, so that when it is pierced by foreign objects and leaks, it can automatically repair itself by using the fluidity and high viscosity of the mixture, thereby enhancing the reliability and safety of the drainage pipe and reducing the probability of leakage.

[0025] (2) In this solution, cobalt chloride is added to the outer layer as a component for detecting water leakage. When a water leakage occurs, the cobalt chloride at the leaking point will absorb water and change color, which can detect the water leakage more intuitively, quickly and accurately, making it easier to find and deal with the problem in a timely manner.

[0026] (3) In terms of fine control of the production process, this scheme uses a special water-based fiber cleaning agent to clean, dry and pre-treat the basalt fiber with plasma surface activation treatment, which improves the bonding performance between the basalt fiber and the resin, ensures the quality of the inner layer of the tube blank, and makes the basalt fiber pretreatment more standardized. At the same time, three extruders are used to perform three extrusion molding for different layers of materials. The three extruders are set with specific temperatures and pressures for different layers of materials, so that each layer of material is extruded and molded under the best conditions, ensuring the production quality and efficiency of the drainage pipe. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are clearly and completely described below; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] 1. Material preparation

[0030] Inner layer material: basalt fiber (7 μm in diameter, 3 mm in length, 25 parts by weight), then cleaned with a German fairy brand water-based fiber cleaning agent, the main ingredients of which are anionic surfactants containing sodium alkyl sulfonate and sodium fatty alcohol ether sulfate, as well as foaming agents, solubilizers, flavors, water, pigments and preservatives. The cleaning time is 20 minutes, dried at 50°C for 1 hour, and then plasma surface activated for 30 minutes, and then premixed with polyester resin (30 parts by weight) at 60°C for 30 minutes.

[0031] Middle layer material: a mixture of styrene-butadiene rubber and polyurethane (mixing ratio of 2:1, 15 parts by weight), pre-mixed at 40°C for 30 minutes.

[0032] Outer layer materials: basalt fiber (25 parts by weight), polyester resin (30 parts by weight), polytetrafluoroethylene resin (30 parts by weight), decabromodiphenyl ether (20 parts by weight), styrene-butadiene-styrene block copolymer (5 parts by weight), cobalt chloride (10 parts by weight), stirred at 800 rpm for 20 minutes at 60°C.

[0033] (II) Production process

[0034] Inner layer molding: Add the prepared inner layer material into the first extruder (extrusion temperature is 180°C, pressure is 5MPa) for extrusion molding to obtain the inner layer tube blank.

[0035] Middle layer composite: add the middle layer material to the second extruder (extrusion temperature is 150℃, pressure is 4MPa) and extrude it onto the inner layer tube to form a composite tube.

[0036] Outer layer coating: The outer layer material is added to the third extruder (extrusion temperature is 160°C, pressure is 10MPa) and extruded onto the composite tube blank to obtain a high-strength basalt fiber drainage pipe.

[0037] (III) Post-processing and testing:

[0038] Sizing: During the sizing process, a high-precision sizing die is used to ensure that the outer diameter of the drainage pipe is accurate and consistent, with the error controlled within the range of 0.5-1 mm;

[0039] Cooling: The cooling process adopts segmented cooling method, which quickly reduces the surface temperature of the drain pipe through segmented air cooling to avoid the effect of water cooling on the discoloration of the cobalt chloride component in the outer layer;

[0040] Cutting: Cutting is done by automated cutting equipment, with precise cutting according to the preset length of 20 cm, and the number of cut sections is 1;

[0041] Quality inspection: The quality inspection process includes appearance inspection and dimension inspection. Appearance inspection mainly checks whether the surface of the drainage pipe is smooth and whether there are defects such as cracks, bubbles, impurities, etc.; dimension inspection uses precision measuring tools to measure the outer diameter, wall thickness, and length parameters of the drainage pipe to ensure that it meets the design requirements.

[0042] Example 2

[0043] 1. Material preparation

[0044] Inner layer material: basalt fiber (diameter 16μm, length 12㎜, weight 32 parts), then cleaned with German fairy brand water-based fiber cleaning agent, its main components are anionic surfactants containing sodium alkyl sulfonate and sodium fatty alcohol ether sulfate, as well as foaming agent, solubilizer, flavor, water, pigment and preservative. The cleaning time is 25 minutes, dried at 55℃ for 1.5 hours, activated for 38 minutes, and premixed with polyester resin (weight 38 parts) at 65℃ for 38 minutes.

[0045] Middle layer material: mixture of styrene-butadiene rubber and polyurethane (20 parts by weight), pre-mixed at 45°C for 38 minutes.

[0046] Outer layer materials: basalt fiber (32 parts by weight), polyester resin (32 parts by weight), polytetrafluoroethylene resin (35 parts by weight), decabromodiphenyl ether (23 parts by weight), styrene-butadiene-styrene block copolymer (8 parts by weight), cobalt chloride (12 parts by weight), stirred at 65°C and 1000 rpm for 25 minutes.

[0047] (II) Production process

[0048] Inner layer molding: The inner layer material is extruded into an inner layer tube blank in the first extruder (190°C, 6MPa).

[0049] Middle layer composite: The middle layer material is extruded onto the inner layer tube blank in the second extruder (165℃, 5MPa).

[0050] Outer layer coating: The outer layer material is extruded onto the composite tube blank in the third extruder (180℃, 11MPa).

[0051] (III) Post-processing and testing:

[0052] Sizing: During the sizing process, a high-precision sizing die is used to ensure that the outer diameter of the drainage pipe is accurate and consistent, with the error controlled within the range of 0.5-1 mm;

[0053] Cooling: The cooling process adopts segmented cooling method, which quickly reduces the surface temperature of the drain pipe through segmented air cooling to avoid the effect of water cooling on the discoloration of the cobalt chloride component in the outer layer;

[0054] Cutting: Cutting is done by automated cutting equipment, with precise cutting according to the preset length of 20 cm, and the number of cut sections is 1;

[0055] Quality inspection: The quality inspection process includes appearance inspection and dimension inspection. Appearance inspection mainly checks whether the surface of the drainage pipe is smooth and whether there are defects such as cracks, bubbles, impurities, etc.; dimension inspection uses precision measuring tools to measure the outer diameter, wall thickness, and length parameters of the drainage pipe to ensure that it meets the design requirements.

[0056] Example 3

[0057] 1. Material preparation

[0058] Inner layer material: basalt fiber (diameter 25μm, length 20㎜, weight 40 parts), then cleaned with German fairy brand water-based fiber cleaning agent, its main components are anionic surfactants containing sodium alkyl sulfonate and sodium fatty alcohol ether sulfate, as well as foaming agent, solubilizer, flavor, water, pigment and preservative. The cleaning time is 30 minutes, dried at 70℃ for 2 hours, activated for 45 minutes, and premixed with polyester resin (weight 45 parts) at 70℃ for 45 minutes.

[0059] Middle layer material: mixture of styrene-butadiene rubber and polyurethane (25 parts by weight), pre-mixed at 50°C for 45 minutes.

[0060] Outer layer materials: basalt fiber (40 parts by weight), polyester resin (40 parts by weight), polytetrafluoroethylene resin (40 parts by weight), decabromodiphenyl ether (25 parts by weight), styrene-butadiene-styrene block copolymer (10 parts by weight), cobalt chloride (14 parts by weight), stirred at 70°C and 1200 rpm for 30 minutes.

[0061] (II) Production process

[0062] Inner layer molding: The inner layer material is extruded in the first extruder (220℃, 8MPa).

[0063] Middle layer composite: The middle layer material is extruded onto the inner layer tube blank in the second extruder (180℃, 6MPa).

[0064] Outer layer coating: The outer layer material is extruded onto the composite tube blank in the third extruder (200℃, 12MPa).

[0065] (III) Post-processing and testing:

[0066] Sizing: During the sizing process, a high-precision sizing die is used to ensure that the outer diameter of the drainage pipe is accurate and consistent, with the error controlled within the range of 0.5-1 mm;

[0067] Cooling: The cooling process adopts segmented cooling method, which quickly reduces the surface temperature of the drain pipe through segmented air cooling to avoid the effect of water cooling on the discoloration of the cobalt chloride component in the outer layer;

[0068] Cutting: Cutting is done by automated cutting equipment, with precise cutting according to the preset length of 20 cm, and the number of cut sections is 1;

[0069] Quality inspection: The quality inspection process includes appearance inspection and dimension inspection. Appearance inspection mainly checks whether the surface of the drainage pipe is smooth and whether there are defects such as cracks, bubbles, impurities, etc.; dimension inspection uses precision measuring tools to measure the outer diameter, wall thickness, and length parameters of the drainage pipe to ensure that it meets the design requirements.

[0070] Comparative Example 1

[0071] 1. Material preparation

[0072] Inner layer material: ordinary glass fiber (30 parts by weight) is used to replace basalt fiber, mixed with polyester resin (35 parts by weight), and mixed at 60°C for 30 minutes.

[0073] Middle layer material: Use single styrene butadiene rubber (20 parts by weight) instead of the mixture of styrene butadiene rubber and polyurethane, pre-mixed at 40°C for 30 minutes.

[0074] Outer layer material: remove polytetrafluoroethylene resin, add ordinary polyethylene resin (30 parts by weight), reduce decabromodiphenyl ether to 15 parts, and reduce styrene-butadiene-styrene block copolymer to 3 parts. Stir the ingredients at 60°C and 800 rpm for 20 minutes.

[0075] (II) Production process

[0076] Inner layer molding: Add the inner layer material into the first extruder, and control the extrusion temperature of the first extruder to 170°C and the pressure to 4MPa to extrude and mold the inner layer tube blank.

[0077] Middle layer compounding: add the middle layer material into the second extruder, and control the extrusion temperature of the second extruder to 140°C and the pressure to 3MPa, and extrude it onto the inner layer tube to form the middle layer tube.

[0078] Outer layer coating: add the outer layer material into the third extruder, and control the extrusion temperature of the third extruder to 150°C and the pressure to 8MPa, and extrude it onto the middle layer tube blank to form a composite tube body.

[0079] (III) Post-processing and testing:

[0080] Sizing: During the sizing process, a high-precision sizing die is used to ensure that the outer diameter of the drainage pipe is accurate and consistent, with the error controlled within the range of 0.5-1 mm;

[0081] Cooling: The cooling process adopts water cooling, which can accelerate the hardening and shaping efficiency of the composite pipe body;

[0082] Cutting: Cutting is done by automated cutting equipment, with precise cutting according to the preset length of 20 cm, and the number of cut sections is 1;

[0083] Quality inspection: The quality inspection process includes appearance inspection and dimension inspection. Appearance inspection mainly checks whether the surface of the drainage pipe is smooth and whether there are defects such as cracks, bubbles, impurities, etc.; dimension inspection uses precision measuring tools to measure the outer diameter, wall thickness, and length parameters of the drainage pipe to ensure that it meets the design requirements.

[0084] Comparative Example 2

[0085] 1. Material preparation

[0086] Inner layer material: basalt fiber (35 parts by weight) and polypropylene resin (35 parts by weight) with poor high temperature resistance are mixed at 60°C for 30 minutes.

[0087] Middle layer material: a mixture of styrene-butadiene rubber and polyurethane (18 parts by weight), premixed at 40°C for 30 minutes.

[0088] Outer layer material: basalt fiber (35 parts by weight), polyester resin (35 parts by weight), polytetrafluoroethylene resin (32 parts by weight), decabromodiphenyl ether (18 parts by weight), styrene-butadiene-styrene block copolymer (6 parts by weight), each component is stirred at 60°C at a speed of 800 rpm for 20 minutes.

[0089] (II) Production process

[0090] Inner layer molding: Add the inner layer material into the first extruder, and control the extrusion temperature of the first extruder to 195°C and the pressure to 6MPa to extrude and mold the inner layer tube blank.

[0091] Middle layer compounding: add the middle layer material into the second extruder, and control the extrusion temperature of the second extruder to 160°C and the pressure to 4.5MPa, and extrude it onto the inner layer tube to form the middle layer tube.

[0092] Outer layer coating: add the outer layer material into the third extruder, and control the extrusion temperature of the third extruder to 175°C and the pressure to 10MPa, and extrude it onto the middle layer tube blank to form a composite tube body.

[0093] (III) Post-processing and testing:

[0094] Sizing: During the sizing process, a high-precision sizing die is used to ensure that the outer diameter of the drainage pipe is accurate and consistent, with the error controlled within the range of 0.5-1 mm;

[0095] Cooling: The cooling process adopts water cooling, which can accelerate the hardening and shaping efficiency of the composite pipe body;

[0096] Cutting: Cutting is done by automated cutting equipment, with precise cutting according to the preset length of 20 cm, and the number of cut sections is 1;

[0097] Quality inspection: The quality inspection process includes appearance inspection and dimension inspection. Appearance inspection mainly checks whether the surface of the drainage pipe is smooth and whether there are defects such as cracks, bubbles, impurities, etc.; dimension inspection uses precision measuring tools to measure the outer diameter, wall thickness, and length parameters of the drainage pipe to ensure that it meets the design requirements.

[0098] Comparative Example 3

[0099] 1. Material preparation

[0100] Inner layer material: basalt fiber (28 parts by weight) is mixed with polyester resin (42 parts by weight). During the pretreatment of basalt fiber, the cleaning time is extended to 40 minutes, the drying temperature is increased to 80°C, the drying time is extended to 3 hours, the surface activation treatment time is extended to 60 minutes, the premixing temperature is increased to 80°C, and the premixing time is extended to 60 minutes.

[0101] Middle layer material: mixture of styrene-butadiene rubber and polyurethane (22 parts by weight), the premixing temperature was increased to 60°C, and the premixing time was extended to 60 minutes.

[0102] Outer layer materials: basalt fiber (38 parts by weight), polyester resin (38 parts by weight), polytetrafluoroethylene resin (42 parts by weight), decabromodiphenyl ether (28 parts by weight), styrene-butadiene-styrene block copolymer (12 parts by weight), stirring temperature is 80°C, stirring speed is 1500 rpm, and stirring time is 40 minutes.

[0103] (II) Production process

[0104] Inner layer molding: Add the inner layer material into the first extruder, and control the extrusion temperature of the first extruder to 230°C and the pressure to 9MPa to extrude and mold the inner layer tube blank.

[0105] Middle layer compounding: add the middle layer material into the second extruder, and control the extrusion temperature of the second extruder to 190°C and the pressure to 7MPa, and extrude it onto the inner layer tube to form the middle layer tube.

[0106] Outer layer coating: add the outer layer material into the third extruder, and control the extrusion temperature of the third extruder to 210°C and the pressure to 14MPa, and extrude it onto the middle layer tube blank to form a composite tube body.

[0107] (III) Post-processing and testing:

[0108] Sizing: During the sizing process, a high-precision sizing die is used to ensure that the outer diameter of the drainage pipe is accurate and consistent, with the error controlled within the range of 0.5-1 mm;

[0109] Cooling: The cooling process adopts water cooling, which can accelerate the hardening and shaping efficiency of the composite pipe body;

[0110] Cutting: Cutting is done by automated cutting equipment, with precise cutting according to the preset length of 20 cm, and the number of cut sections is 1;

[0111] Quality inspection: The quality inspection process includes appearance inspection and dimension inspection. Appearance inspection mainly checks whether the surface of the drainage pipe is smooth and whether there are defects such as cracks, bubbles, impurities, etc.; dimension inspection uses precision measuring tools to measure the outer diameter, wall thickness, and length parameters of the drainage pipe to ensure that it meets the design requirements.

[0112] Experimental part:

[0113] The prepared drain pipes were subjected to experimental tests respectively using the conditions of Examples 1 to 3 and Comparative Examples 1 to 3. The contents of the experimental tests included a steel needle puncture test on the drain pipe under constant water pressure conditions to observe whether there was rupture at the puncture position and whether there was leakage at the rupture, and then dripping water from the outer wall at the rupture to observe whether color was shown at the rupture, thereby facilitating determination of whether the rupture was easy to locate; and also included a tensile test on the drain pipe under different tensile strength conditions to obtain the elongation at tensile fracture, thereby facilitating determination of the tensile resistance of the drain pipe.

[0114] The experimental test results are shown in the following table:

[0115] Water supply pressure (MPa) Needle puncture pressure (MPa) Is the drain pipe broken? Is the rupture leaking? Does water dripping from the outside of the rupture show color? Tensile strength (MPa) Tensile elongation at break Example 1 3.5 5 yes no yes 380 0.5% Comparative Example 1 3.5 5 yes yes no 380 0.7% Example 2 3.5 6 yes no yes 400 0.4% Comparative Example 2 3.5 6 yes yes no 400 0.8% Example 3 3.5 8 yes no yes 420 0.2% Comparative Example 3 3.5 8 yes yes no 420 1%

[0116] It can be seen from the results in the table that the inner and outer layers are both made of basalt fiber reinforced materials and high-performance polyester resin composites. Basalt fiber has high strength characteristics and provides good structural strength for the drain pipe. Then the middle layer uses a mixture of styrene-butadiene rubber and polyurethane to form a leak-proof self-healing polymer rubber layer, so that when it is pierced by foreign objects and leaks, it can use the fluidity and high viscosity of the mixture to automatically repair itself, thereby enhancing the reliability and safety of the drain pipe and reducing the probability of leakage. Cobalt chloride is also added to the outer layer as a leak detection component. When a leak occurs, the cobalt chloride at the leaking port will absorb water and change color, which can detect the leak more intuitively, quickly and accurately, making it convenient to find and deal with the problem in a timely manner.

[0117] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-strength basalt fiber drainage pipe, comprising an inner layer, an intermediate layer and an outer layer, characterized in that: The inner layer is composited by a basalt fiber reinforcement material and a high-performance resin, wherein the basalt fiber reinforcement material is basalt fiber, and the basalt fiber is 25-40 parts by weight, and the high-performance resin is a high-temperature resistant and corrosion-resistant polyester resin, and the polyester resin is 30-45 parts by weight; The middle layer is a leak-proof self-healing polymer rubber layer, which is a mixture of styrene-butadiene rubber and polyurethane, and the ratio of the mixed components is 2:1, which is 15-25 parts by weight; The outer layer includes basalt fiber reinforcement material and high-performance resin, and also includes corrosion-resistant resin material, flame retardant, toughening agent and cobalt chloride as a component for detecting water leakage. The corrosion-resistant resin material is a polytetrafluoroethylene resin with excellent corrosion resistance, and the polytetrafluoroethylene resin is 30-40 parts by weight. The flame retardant is decabromodiphenyl ether, and the decabromodiphenyl ether is 20-25 parts by weight. The toughening agent is a styrene-butadiene-styrene block copolymer with good elasticity and processing properties, and the styrene-butadiene-styrene block copolymer is 5-10 parts by weight. The cobalt chloride is 10-14 parts by weight.

2. The high-strength basalt fiber drainage pipe according to claim 1, characterized in that: The diameter of the basalt fiber is 7-25 μm, and the length of the basalt fiber is 3-20 mm.

3. A high-strength basalt fiber drainage pipe production process, characterized in that: The following steps are involved: Step 1: preparing the inner layer material, pre-treating the basalt fiber, removing impurities and performing surface activation treatment, adding the basalt fiber and the polyester resin in proportion by weight into the first extruder, and extruding to obtain the inner layer tube blank; Step 2: preparing the intermediate layer material, adding the mixture of styrene-butadiene rubber and polyurethane into the second extruder according to parts by weight, and extruding the intermediate layer material onto the inner layer tube blank to form a composite tube blank with an intermediate layer; Step 3: prepare the outer layer material, mix basalt fiber, polyester resin, polytetrafluoroethylene resin, decabromodiphenyl ether, styrene-butadiene-styrene block copolymer and cobalt chloride in parts by weight, add them into the third extruder, extrude the outer layer material onto the composite tube blank with the middle layer, and form a three-layer high-strength basalt fiber drainage pipe; Step 4: The extruded high-strength basalt fiber drainage pipe is cooled, sized and cut, and then quality tested to ensure that the product meets quality standards.

4. The high-strength basalt fiber drainage pipe production process according to claim 3 is characterized in that: In the step 1, the pretreatment of the basalt fiber includes cleaning with a water-based fiber cleaning agent for 20-30 minutes, drying at a temperature of 50-70° C. for 1-2 hours after cleaning, and then using plasma surface activation treatment for 30-45 minutes. Before the basalt fiber and the polyester resin are added to the first extruder, they must be premixed at a temperature of 60-70° C. for 30-45 minutes to ensure the uniformity of the mixture.

5. The high-strength basalt fiber drainage pipe production process according to claim 3 is characterized by: In the step 2, before adding the mixture of styrene-butadiene rubber and polyurethane into the second extruder, it needs to be pre-mixed at a temperature of 40-50° C. for 30-45 minutes to ensure the uniformity of the mixture.

6. The high-strength basalt fiber drainage pipe production process according to claim 3 is characterized by: In step 3, before the outer layer material is added to the third extruder, it must be pre-mixed by a high-speed stirring device at a stirring temperature of 60-70° C., a stirring speed of 800-1200 rpm, and a stirring time of 20-30 minutes to ensure that all ingredients are fully mixed.

7. The high-strength basalt fiber drainage pipe production process according to claim 3 is characterized by: The extrusion temperature of the first extruder is 180-220°C and the pressure is 5-8MPa, the extrusion temperature of the second extruder is 150-180°C and the pressure is 4-6MPa, and the extrusion temperature of the third extruder is 160-200°C and the pressure is 10-12MPa.