High-pressure-resistant epoxy resin water conveying pipeline for mine and preparation process thereof
Through a three-layer composite structure and precise manufacturing process, the problems of high pressure resistance, lightweight, flame retardancy and antistatic properties of water pipelines for mining have been solved, achieving reliability and durability in harsh environments and possessing the advantage of lifetime maintenance-free operation.
Patent Information
- Application Number
- CN202511838879.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-02-27
AI Technical Summary
Existing mine water pipelines cannot simultaneously meet the multiple requirements of high pressure resistance, lightweight, flame retardancy, and antistatic properties.
The mining high-pressure resistant epoxy resin water pipeline adopts a three-layer composite structure. The inner lining, structural reinforcement layer and outer protective layer are composed of specific components and materials. They are formed through precise manufacturing processes such as centrifugal casting and wet winding. Combined with multiple toughening, reinforcement and flame retardant designs, it ensures a strong bond and excellent performance between the layers.
It enables long-term stable operation of pipelines in high-pressure and corrosive mining environments, meets multiple requirements such as high pressure resistance, lightweight, flame retardancy and antistatic properties, has excellent mechanical properties and safety, and basically achieves lifetime maintenance-free operation.
Smart Images
Figure CN121574495A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of pipeline, in particular to a high-pressure-resistant epoxy resin water pipeline for mine and a preparation process thereof. BACKGROUND
[0002] The water pipelines used in mines include cast iron pipes, steel pipes and plastic pipes, each of which has different defects and is difficult to meet the multiple requirements of high-pressure resistance, lightweight, flame retardation and antistatic property. SUMMARY
[0003] The first technical problem to be solved by the present application is to provide a high-pressure-resistant epoxy resin water pipeline for mine meeting the multiple requirements of high-pressure resistance, lightweight, flame retardation and antistatic property.
[0004] To solve the above first technical problem, the technical scheme adopted by the present application is as follows: a pipe body, the pipe body is composed of an inner lining layer, a structure reinforcing layer and an outer protective layer from inside to outside, the inner lining layer comprises the following components by weight: epoxy resin 100 parts by weight liquid carboxyl-terminated nitrile rubber 8-12 parts by weight core-shell polymer microparticles 3-5 parts by weight nano-silicon dioxide 2-4 parts by weight conductive carbon black 5-8 parts by weight aromatic amine curing agent 50-90 parts by weight accelerator 1-2 parts by weight The structure reinforcing layer comprises the following components by weight: epoxy resin 100 parts by weight carbon fiber 200-300 parts by weight aramid fiber 50-100 parts by weight microencapsulated red phosphorus flame retardant 60-90 parts by weight carbon nanotube 1-3 parts by weight The outer protective layer comprises the following components by weight: epoxy resin 100 parts by weight aluminum hydroxide flame retardant 15-20 parts by weight wear-resistant filler 15-25 parts by weight conductive carbon black and metal oxide conductive powder 8-12 parts by weight surface-active antistatic agent 2-4 parts by weight ultraviolet absorber 5-10 parts by weight anti-aging agent 2-8 parts by weight
[0005] Additional technical features include that the epoxy resin is a mixture of bisphenol A type epoxy resin and phenolic epoxy resin, the mass ratio of bisphenol A type epoxy resin and phenolic epoxy resin is 70:30, and the core-shell polymer microparticle is polybutadiene-styrene-methyl methacrylate; The carbon fibers and aramid fibers in the structural reinforcement layer are combined in the form of hoop winding and spiral winding, the hoop winding mainly uses carbon fibers, the spiral winding uses an alternating auxiliary layer of carbon fibers and aramid fibers, the angle of the hoop winding is 85-90 degrees, and the angle of the spiral winding is 15-20 degrees; The thickness of the inner lining layer is 0.3-0.5 mm, and the thickness of the outer protective layer is 0.8-1.2 mm; The outer surface of the inner lining layer is provided with a micro-thread pattern, and the outer surface of the outer protective layer is provided with an orange peel texture; The wear-resistant filler of the outer protective layer is silicon carbide or aluminum oxide.
[0006] The second technical problem to be solved by the present application is to provide a preparation process of a high-pressure-resistant epoxy resin water conveying pipeline for mines.
[0007] To solve the above-mentioned second technical problem, the technical solution adopted by the present application includes the following steps: First step: inner lining layer preparation The inner lining layer is prepared by centrifugal casting, a mixed liquid composed of 100 parts by weight of epoxy resin, 8-12 parts by weight of liquid carboxyl-terminated nitrile rubber, 3-5 parts by weight of core-shell polymer microparticles, 2-4 parts by weight of nano-silicon dioxide, 5-8 parts by weight of conductive carbon black, 50-90 parts by weight of aromatic amine curing agent, and 1-2 parts by weight of accelerator is injected into a rotating mold to form an inner lining layer with uniform thickness and no defects under the action of centrifugal force, the inner lining layer is arranged on a mandrel, and the curing degree of the inner lining layer is controlled at 85%-90% to maintain a certain reaction activity, so as to facilitate the formation of a firm chemical bond with the structural reinforcement layer; Second step: structural reinforcement layer preparation The structural reinforcement layer is prepared using a wet winding process. A computer-controlled four-axis winding machine achieves precise fiber layup. Before production, the winding profile is designed based on the pipe diameter and pressure rating, determining parameters such as winding angle, yarn width, and winding tension. During preparation, 200-300 parts by weight of carbon fiber and 50-100 parts by weight of aramid fiber are passed through a resin impregnation tank containing a mixture of 100 parts by weight of epoxy resin, 60-90 parts by weight of microencapsulated red phosphorus flame retardant, and 1-3 parts by weight of carbon nanotubes. The mixture is then wound onto the inner lining layer via a guide head along a pre-defined path. During winding, fiber tension is precisely controlled: 20-25 N for circumferential winding and 15-20 N for helical winding, maintained constant through a closed-loop tension control system to prevent fiber loosening or over-tension. Environmental conditions are strictly controlled during winding, with temperature maintained at 23±2℃ and relative humidity controlled at 50%±10%. To prevent temperature fluctuations from causing changes in resin viscosity and affecting fiber impregnation, each layer is compacted with a compaction roller to remove air bubbles and ensure good interlayer bonding. Fiber position, resin content, and layer thickness are monitored in real time throughout the winding process to ensure the product meets design requirements. Step 3: Preparation of the outer protective layer A mixture of 100 parts by weight epoxy resin, 15-20 parts by weight aluminum hydroxide flame retardant, 15-25 parts by weight wear-resistant filler, 8-12 parts by weight conductive carbon black and metal oxide conductive powder, 2-4 parts by weight surfactant antistatic agent, 5-10 parts by weight ultraviolet absorber, and 2-8 parts by weight anti-aging agent is sprayed onto the outer wall of the structural reinforcement layer before curing. Curing employs a staged programmed temperature curing process. The curing cycle consists of three steps: a gel stage, a curing stage, and a post-curing stage. The gel stage is carried out at 80℃ for 2 hours. During this stage, the resin viscosity gradually decreases and then rapidly increases, eventually reaching a gel state. This stage uses a slow heating method, with the heating rate controlled at 0.5-1℃ / min. To prevent the rapid release of volatiles and the formation of bubbles, the curing stage is carried out at 120℃ for 4 hours. During this stage, the cross-linking reaction of the resin is basically completed, and the pipe acquires most of its mechanical properties. The post-curing stage is carried out at 150℃ for 2 hours. This stage aims to increase the cross-linking density of the resin, especially the curing degree of phenolic epoxy resin, thereby improving the heat resistance and long-term service performance of the pipe. During the curing process, the mold is kept rotating at a uniform speed (5-10 rpm) to prevent the resin from flowing under gravity and to ensure uniform wall thickness. For large-diameter pipes (>300 mm), a low air pressure (0.2-0.5 MPa) needs to be applied inside the pipe to support the pipe structure and prevent deformation during the curing process. After curing, a programmed cooling method is used, with the cooling rate controlled at 1-2℃ / min, until 60℃ is reached. Step 4: Demolding After the tube is wrapped and sprayed, remove the tube from the mandrel.
[0008] This invention provides a high-pressure resistant epoxy resin water conveyance pipe for mining, which adopts a three-layer composite structure consisting of an inner lining layer, a structural reinforcement layer, and an outer protective layer, as detailed below: As the first line of defense for pipelines, the inner lining primarily provides excellent sealing and corrosion resistance. This layer uses modified epoxy resin as the main material, and the addition of appropriate amounts of liquid-terminated carboxyl-terminated nitrile butadiene rubber (CTBN) and nano-silica effectively enhances the toughness and surface hardness of the lining. In the specific design, the thickness of the inner lining is controlled within the range of 0.3-0.5 mm, ensuring both pipeline flexibility and sufficient wear resistance. Conductive carbon black is also added to the material formulation of the inner lining, giving the inner layer a certain degree of antistatic capability and preventing static electricity buildup. To enhance the bonding strength between the inner lining and the structural reinforcement layer, the outer surface of the inner lining is designed with fine spiral patterns. This structure not only increases the interlayer bonding area but also optimizes stress distribution when the pipeline is subjected to internal pressure. The curing system for the inner lining uses aromatic amine curing agents, which have high heat distortion temperature and crosslinking density, ensuring the long-term stability of the pipeline under high temperature and high pressure environments.
[0009] The structural reinforcement layer is the core structure of the pipeline that withstands an internal pressure of 20 MPa, employing a fiber winding design that combines circumferential and helical directions. Circumferential winding primarily bears the circumferential stress caused by the internal pressure, using a winding angle of ±85°-90°; while helical winding primarily bears axial stress and external loads, using a winding angle of ±15°-20°. This multi-angle winding design ensures the pipeline exhibits uniform mechanical properties in all directions, avoiding weak points. A hybrid reinforcement scheme of carbon fiber and aramid fiber is selected, where carbon fiber provides extremely high stiffness and strength, while aramid fiber contributes excellent impact resistance and fatigue resistance. The fiber volume content is controlled between 60% and 70%, a proportion that fully utilizes the reinforcing effect of the fibers while ensuring sufficient wetting of the fibers by the resin matrix. Microencapsulated red phosphorus flame retardant and carbon nanotubes are also added to the resin matrix of the structural reinforcement layer; the former provides highly efficient flame retardant properties, while the latter constructs a three-dimensional conductive network, further enhancing the pipeline's antistatic capabilities.
[0010] The outer protective layer is the part of the pipeline that comes into direct contact with the external environment, requiring excellent wear resistance, impact resistance, and weather resistance. This layer uses toughened epoxy resin as the matrix, with added aluminum hydroxide flame retardant and wear-resistant fillers such as silicon carbide or alumina, the filler content controlled between 15% and 25%. The outer protective layer thickness is designed to be 0.8-1.2 mm, and the surface features an orange peel texture design to increase grip and wear resistance. In the material formulation of the outer protective layer, special attention is paid to the durability of antistatic properties. A dual conductive mechanism is constructed through the compounding of conductive carbon black and conductive metal oxide powder, ensuring that the surface resistance of the pipeline is stably maintained within the range of 10^5-10^8 Ω, meeting the requirements of mining safety standards. In addition, ultraviolet absorbers and anti-aging agents are added to the outer protective layer to address the potential solar aging issues faced by the surface portion of the mine.
[0011] This invention provides a high-pressure resistant epoxy resin water pipeline for mining, the performance advantages of which largely depend on its material formulation system. Through careful component design and ratio optimization, this system achieves long-term stable operation of the pipeline in high-pressure, corrosive mining environments. Details are as follows: Firstly, epoxy resin modified system The epoxy resin matrix is the core component of pipe composite materials, directly affecting the mechanical properties, heat resistance, and corrosion resistance of the pipe. A mixture of bisphenol A type epoxy resin (E-51) and phenolic epoxy resin (F-51) in a mass ratio of 70:30 is selected as the base resin. This combination maintains the good mechanical properties of bisphenol A type epoxy resin while utilizing the high crosslinking density and heat resistance of phenolic epoxy resin. In terms of resin modification, a multiple toughening mechanism is adopted: First, 8-12% of liquid carboxyl-terminated butadiene-acrylonitrile rubber (CTBN) is added, which forms rubber particles through phase separation, inducing crazing and shear bands to improve the toughness of the matrix; second, 3-5% of core-shell polymer microparticles are added, which are composed of polybutadiene-styrene-methyl methacrylate, and the shell has good compatibility with epoxy resin; finally, 2-4% of nano-silica is introduced, and its uniform dispersion in the resin is ensured through surface modification, and the size effect of nanoparticles is used to further increase the strength and toughness of the resin. The curing system uses 4,4'-diaminodiphenyl sulfone (DDS) as the main curing agent, combined with 1-2% 2-ethyl-4-methylimidazolium as an accelerator. As an aromatic amine curing agent, DDS provides a high glass transition temperature (≥160℃) and heat distortion temperature, ensuring the pipeline maintains good mechanical properties even at high temperatures. The curing process employs a stepped curing method: pre-curing at 80℃ for 2 hours, then curing at 120℃ for 4 hours, and finally curing at 150℃ for 2 hours. This staged curing process effectively controls the heat of curing, reduces internal stress, and improves the overall performance of the cured product. Secondly, the selection of reinforcing fibers. Reinforcing fibers are crucial for pipelines to withstand high pressure. To address the specific requirements of the mining environment, a hybrid reinforcement scheme combining carbon fiber and aramid fiber was adopted. The carbon fiber used was T700 grade 12K tow, with a tensile strength of 4.9 GPa, a modulus of 230 GPa, and an elongation at break of 2.1%. The aramid fiber used was Kevlar 49, with a tensile strength of 3.6 GPa, a modulus of 124 GPa, and an elongation at break of 2.8%. In terms of fiber configuration, the circumferential winding of the structural reinforcement layer primarily uses carbon fiber to provide extremely high circumferential strength and stiffness; while the helical winding employs alternating layers of carbon fiber and aramid fiber, utilizing the excellent impact resistance and fatigue resistance of aramid fiber to improve the pipeline's resistance to external impacts and pressure fluctuations. The surface treatment of the fibers has also been optimized according to the fiber type: carbon fiber undergoes nitric acid oxidation treatment to increase the number of surface-active groups; aramid fiber is treated with a silane coupling agent to improve its interfacial adhesion to epoxy resin. To maximize fiber reinforcement efficiency, precise control of fiber tension is crucial during the winding process. Circumferential winding employs higher fiber tension (20-25N) to ensure the fibers do not loosen during curing; helical winding uses lower fiber tension (15-20N) to prevent fiber slippage at intersections. This differentiated tension control effectively improves the fiber strength conversion efficiency, ensuring the safe operation of the pipeline under design pressure. Third, flame retardant system design The flame-retardant performance of pipelines is crucial for mine safety. The design employs an intumescent halogen-free flame-retardant system, achieving highly efficient flame retardancy through the synergistic effects of gaseous, condensing, and cooling mechanisms. The main body of the flame-retardant system consists of three parts: an acid source, a carbon source, and a gas source. The acid source is ammonium polyphosphate (APP), which catalyzes the dehydration and carbonization of carbonaceous materials upon heating. The carbon source is pentaerythritol (PER), which acts as a char-forming agent to create an expanded char layer. The gas source is melamine (MEL), which decomposes upon heating to release non-flammable gases. To address the specific characteristics of epoxy resin, 5-8% microencapsulated red phosphorus was added as a flame retardant synergist. Microencapsulation effectively solves the problems of red phosphorus's hygroscopicity, toxicity release, and poor compatibility with resin. During combustion, red phosphorus generates phosphoric acid derivatives, promoting dehydration and charring on the resin surface while reducing the generation of flammable gases. Furthermore, 15-20% aluminum hydroxide was added to the formulation, which begins to decompose endothermically above 200℃, releasing water vapor, diluting flammable gases, and forming a protective alumina layer on the material surface. Through a carefully designed flame-retardant system, the limiting oxygen index (LOI) of the pipeline can reach over 32%, and the UL-94 vertical flammability rating reaches V-0. It can effectively self-extinguish even under open flame conditions, and the smoke density produced during combustion is low, with minimal release of toxic gases, fully meeting the requirements of mine safety standards. Fourth, antistatic system design Antistatic properties are crucial for pipelines used in mining. The design employs a composite conductive filler system, constructing a three-dimensional conductive network using conductive fillers of different shapes and sizes. The system uses conductive carbon black as the main conductive filler, with an addition amount of 8-12%, utilizing the tunneling effect between carbon black particles to form basic conductive pathways. Simultaneously, 1-3% carbon nanotubes are added, leveraging their high aspect ratio and excellent conductivity to construct an auxiliary conductive network within the resin matrix, significantly reducing the conductive permeation threshold. To ensure uniform dispersion of the conductive filler, carbon nanotubes are first subjected to acid oxidation treatment to increase the number of surface hydroxyl and carboxyl groups, thereby improving compatibility with the resin. Then, they are pre-dispersed with epoxy resin using a three-roll mill to achieve a grinding fineness below 15 μm. The conductive carbon black is dispersed using a combination of high-speed stirring and ultrasonic treatment to ensure complete deagglomeration of the carbon black aggregates, forming a stable conductive network. In addition, 2-4% N-(3-dodecyloxy-2-hydroxypropyl)ethanolamine is added to the outer protective layer of the pipe as a surface-active antistatic agent. It can migrate to the pipe surface, adsorb moisture from the air to form a conductive layer, providing additional antistatic protection. Through this multi-layered antistatic design, the resistance values of both the inner and outer surfaces of the pipe can be stabilized within the range of 10^5-10^8 Ω, effectively preventing safety hazards caused by static electricity accumulation.
[0012] This invention provides a high-pressure resistant epoxy resin water pipeline for mining, employing a three-layer composite structure consisting of an inner lining layer, a structural reinforcement layer, and an outer protective layer. This structure meets multiple requirements for high pressure resistance, lightweight design, flame retardancy, and antistatic properties. This structural design, through the combination of different functional layers, achieves the pipeline's reliability and durability in harsh mining environments. The design phase incorporates advance planning based on the specific application environment. In terms of maintenance, it essentially achieves the advantages of being maintenance-free for its entire lifespan and reusable. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a high-pressure resistant epoxy resin water pipeline for mining according to the present invention. Detailed Implementation
[0014] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further explanation of the present invention regarding a high-pressure resistant epoxy resin water pipeline for mining and its manufacturing process.
[0015] like Figure 1As shown, the present invention provides a high-pressure resistant epoxy resin water pipeline for mining, comprising a pipe body 1, wherein the pipe body 1 consists of an inner lining layer 2, a structural reinforcement layer 3, and an outer protective layer 4 from the inside out.
[0016] The present invention provides a high-pressure resistant epoxy resin water transmission pipe for mining, the specific manufacturing process of which is as follows: Example 1
[0017] The steps for manufacturing a high-pressure resistant epoxy resin water transmission pipe for mining are as follows: Step 1: Inner Liner Preparation The inner liner is prepared by centrifugal casting. A mixture consisting of 100 parts by weight of epoxy resin, 8 parts by weight of liquid carboxyl-terminated nitrile rubber, 3 parts by weight of core-shell polymer microparticles, 2 parts by weight of nano-silica, 5 parts by weight of conductive carbon black, 50 parts by weight of aromatic amine curing agent, and 1 part by weight of accelerator is injected into a rotating mold. Under centrifugal force, a uniform and defect-free inner liner is formed. The inner liner is then placed on a mandrel. The curing degree of the inner liner is controlled at 85%-90% to maintain a certain reactivity, which facilitates a strong chemical bond with the structural reinforcement layer. Step 2: Fabrication of the structural reinforcement layer The structural reinforcement layer is prepared using a wet winding process. A computer-controlled four-axis winding machine achieves precise fiber layup. Before production, the winding profile is designed based on the pipe diameter and pressure rating, determining parameters such as winding angle, yarn width, and winding tension. During preparation, 200 parts by weight of carbon fiber and 50 parts by weight of aramid fiber are passed through a resin impregnation tank containing a mixture of 100 parts by weight of epoxy resin, 60 parts by weight of microencapsulated red phosphorus flame retardant, and 1 part by weight of carbon nanotubes. The mixture is then wound onto the inner lining layer via a guide head along a pre-defined path. During winding, fiber tension is precisely controlled: 20-25 N for circumferential winding and 15-20 N for helical winding, maintained constant through a closed-loop tension control system to prevent fiber loosening or over-tension. Environmental conditions are strictly controlled during winding, with temperature maintained at 23±2℃ and relative humidity controlled at 50%±10%. To prevent temperature fluctuations from causing changes in resin viscosity and affecting fiber impregnation, each layer is compacted with a compaction roller to remove air bubbles and ensure good interlayer bonding. Fiber position, resin content, and layer thickness are monitored in real time throughout the winding process to ensure the product meets design requirements. Step 3: Preparation of the outer protective layer A mixture of 100 parts by weight epoxy resin, 15 parts by weight aluminum hydroxide flame retardant, 15 parts by weight wear-resistant filler, 8 parts by weight conductive carbon black and metal oxide conductive powder, 2 parts by weight surfactant antistatic agent, 5 parts by weight ultraviolet absorber, and 2 parts by weight anti-aging agent was sprayed onto the outer wall of the structural reinforcement layer before curing. Curing employed a staged programmed temperature curing process. The curing cycle consisted of three steps: a gel stage, a curing stage, and a post-curing stage. The gel stage was conducted at 80℃ for 2 hours, during which the resin viscosity gradually decreased and then rapidly increased until a gel state was reached. This stage employed a slow heating method, with the heating rate controlled at 0.5-1℃ / min. To prevent the rapid release of volatiles and the formation of bubbles, the curing stage is carried out at 120℃ for 4 hours. During this stage, the cross-linking reaction of the resin is basically completed, and the pipe acquires most of its mechanical properties. The post-curing stage is carried out at 150℃ for 2 hours. This stage aims to increase the cross-linking density of the resin, especially the curing degree of phenolic epoxy resin, thereby improving the heat resistance and long-term service performance of the pipe. During the curing process, the mold is kept rotating at a uniform speed (5-10 rpm) to prevent the resin from flowing under gravity and to ensure uniform wall thickness. For large-diameter pipes (>300 mm), a low air pressure (0.2-0.5 MPa) needs to be applied inside the pipe to support the pipe structure and prevent deformation during the curing process. After curing, a programmed cooling method is used, with the cooling rate controlled at 1-2℃ / min, until 60℃ is reached. Step 4: Demolding After the tube is wrapped and sprayed, remove the tube from the mandrel. Example 2
[0018] The steps for manufacturing a high-pressure resistant epoxy resin water transmission pipe for mining are as follows: Step 1: Inner Liner Preparation The inner liner is prepared by centrifugal casting. A mixture consisting of 100 parts by weight of epoxy resin, 10 parts by weight of liquid carboxyl-terminated nitrile rubber, 4 parts by weight of core-shell polymer microparticles, 3 parts by weight of nano-silica, 6.5 parts by weight of conductive carbon black, 70 parts by weight of aromatic amine curing agent, and 1.5 parts by weight of accelerator is injected into a rotating mold. Under centrifugal force, a uniform and defect-free inner liner is formed. The inner liner is then placed on a mandrel. The curing degree of the inner liner is controlled at 85%-90% to maintain a certain reactivity, which facilitates a strong chemical bond with the structural reinforcement layer. Step 2: Fabrication of the structural reinforcement layer The structural reinforcement layer is prepared using a wet winding process. A computer-controlled four-axis winding machine achieves precise fiber layup. Before production, the winding profile is designed based on the pipe diameter and pressure rating, determining parameters such as winding angle, yarn width, and winding tension. During preparation, 250 parts by weight of carbon fiber and 75 parts by weight of aramid fiber are passed through a resin impregnation tank containing a mixture of 100 parts by weight of epoxy resin, 75 parts by weight of microencapsulated red phosphorus flame retardant, and 2 parts by weight of carbon nanotubes. The mixture is then wound onto the inner lining layer via a guide head along a pre-defined path. During winding, fiber tension is precisely controlled: 20-25 N for circumferential winding and 15-20 N for helical winding, maintained constant through a closed-loop tension control system to prevent fiber loosening or over-tension. Environmental conditions are strictly controlled during winding, with temperature maintained at 23±2℃ and relative humidity controlled at 50%±10%. To prevent temperature fluctuations from causing changes in resin viscosity and affecting fiber impregnation, each layer is compacted with a compaction roller to remove air bubbles and ensure good interlayer bonding. Fiber position, resin content, and layer thickness are monitored in real time throughout the winding process to ensure the product meets design requirements. Step 3: Preparation of the outer protective layer A mixture of 100 parts by weight epoxy resin, 17.5 parts by weight aluminum hydroxide flame retardant, 20 parts by weight wear-resistant filler, 10 parts by weight conductive carbon black and metal oxide conductive powder, 3 parts by weight surfactant antistatic agent, 7.5 parts by weight ultraviolet absorber, and 5 parts by weight anti-aging agent was sprayed onto the outer wall of the structural reinforcement layer before curing. Curing employed a staged programmed temperature curing process. The curing cycle consisted of three steps: a gel stage, a curing stage, and a post-curing stage. The gel stage was conducted at 80℃ for 2 hours, during which the resin viscosity gradually decreased and then rapidly increased until a gel state was reached. This stage employed a slow heating method, with the heating rate controlled at 0.5-1℃ / min. To prevent the rapid release of volatiles and the formation of bubbles, the curing stage is carried out at 120℃ for 4 hours. During this stage, the cross-linking reaction of the resin is basically completed, and the pipe acquires most of its mechanical properties. The post-curing stage is carried out at 150℃ for 2 hours. This stage aims to increase the cross-linking density of the resin, especially the curing degree of phenolic epoxy resin, thereby improving the heat resistance and long-term service performance of the pipe. During the curing process, the mold is kept rotating at a uniform speed (5-10 rpm) to prevent the resin from flowing under gravity and to ensure uniform wall thickness. For large-diameter pipes (>300 mm), a low air pressure (0.2-0.5 MPa) needs to be applied inside the pipe to support the pipe structure and prevent deformation during the curing process. After curing, a programmed cooling method is used, with the cooling rate controlled at 1-2℃ / min, until 60℃ is reached. Step 4: Demolding After the tube is wrapped and sprayed, remove the tube from the mandrel. Example 3
[0019] The steps for manufacturing a high-pressure resistant epoxy resin water transmission pipe for mining are as follows: Step 1: Inner Liner Preparation The inner liner is prepared by centrifugal casting. A mixture consisting of 100 parts by weight of epoxy resin, 12 parts by weight of liquid carboxyl-terminated nitrile rubber, 5 parts by weight of core-shell polymer microparticles, 4 parts by weight of nano-silica, 8 parts by weight of conductive carbon black, 90 parts by weight of aromatic amine curing agent, and 2 parts by weight of accelerator is injected into a rotating mold. Under centrifugal force, a uniform and defect-free inner liner is formed. The inner liner is then placed on a mandrel. The curing degree of the inner liner is controlled at 85%-90% to maintain a certain reactivity, which facilitates a strong chemical bond with the structural reinforcement layer. Step 2: Fabrication of the structural reinforcement layer The structural reinforcement layer is prepared using a wet winding process. A computer-controlled four-axis winding machine achieves precise fiber layup. Before production, the winding profile is designed based on the pipe diameter and pressure rating, determining parameters such as winding angle, yarn width, and winding tension. During preparation, 300 parts by weight of carbon fiber and 100 parts by weight of aramid fiber are passed through a resin impregnation tank containing a mixture of 100 parts by weight of epoxy resin, 90 parts by weight of microencapsulated red phosphorus flame retardant, and 3 parts by weight of carbon nanotubes. The mixture is then wound onto the inner lining layer via a guide head along a pre-defined path. Fiber tension is precisely controlled during winding: 20-25 N for circumferential winding and 15-20 N for helical winding, maintained constant through a closed-loop tension control system to prevent fiber loosening or over-tension. Environmental conditions are strictly controlled during winding: temperature is maintained at 23±2℃, and relative humidity is controlled at 50%±10%. To prevent temperature fluctuations from causing changes in resin viscosity and affecting fiber impregnation, each layer is compacted with a compaction roller to remove air bubbles and ensure good interlayer bonding. Fiber position, resin content, and layer thickness are monitored in real time throughout the winding process to ensure the product meets design requirements. Step 3: Preparation of the outer protective layer A mixture of 100 parts by weight epoxy resin, 20 parts by weight aluminum hydroxide flame retardant, 25 parts by weight wear-resistant filler, 12 parts by weight conductive carbon black and metal oxide conductive powder, 4 parts by weight surfactant antistatic agent, 10 parts by weight ultraviolet absorber, and 8 parts by weight anti-aging agent was sprayed onto the outer wall of the structural reinforcement layer and then cured. The curing process employed a staged programmed temperature rise curing process. The curing cycle consisted of three steps: a gel stage, a curing stage, and a post-curing stage. The gel stage was carried out at 80℃ for 2 hours. During this stage, the resin viscosity gradually decreased and then rapidly increased, eventually reaching a gel state. This stage used a slow heating method, with the heating rate controlled at 0.5-1℃ / min. To prevent the rapid release of volatiles and the formation of bubbles, the curing stage is carried out at 120℃ for 4 hours. During this stage, the cross-linking reaction of the resin is basically completed, and the pipe acquires most of its mechanical properties. The post-curing stage is carried out at 150℃ for 2 hours. This stage aims to increase the cross-linking density of the resin, especially the curing degree of phenolic epoxy resin, thereby improving the heat resistance and long-term service performance of the pipe. During the curing process, the mold is kept rotating at a uniform speed (5-10 rpm) to prevent the resin from flowing under gravity and to ensure uniform wall thickness. For large-diameter pipes (>300 mm), a low air pressure (0.2-0.5 MPa) needs to be applied inside the pipe to support the pipe structure and prevent deformation during the curing process. After curing, a programmed cooling method is used, with the cooling rate controlled at 1-2℃ / min, until 60℃ is reached. Step 4: Demolding After the tube is wrapped and sprayed, remove the tube from the mandrel.
[0020] This invention provides a high-pressure resistant epoxy resin water pipeline for mining, employing a three-layer composite structure consisting of an inner lining layer 2, a structural reinforcement layer 3, and an outer protective layer 4. This structure meets multiple requirements for high pressure resistance, lightweight, flame retardancy, and antistatic properties. This structural design, through the combination of different functional layers, achieves the pipeline's reliability and durability in harsh mining environments. The design phase incorporates advance planning based on the specific application environment. In terms of maintenance, it essentially achieves the advantages of being maintenance-free for its entire lifespan and reusable.
[0021] The high-pressure resistant epoxy resin water pipeline for mining and its preparation process provided by the present invention are not limited to the above embodiments. Any modifications, equivalent substitutions and improvements made on the basis of the present invention should be included within the protection scope of the present invention.
Claims
1. A high-pressure resistant epoxy resin water pipeline for mining, comprising a pipe body, wherein the pipe body consists of an inner lining layer, a structural reinforcement layer, and an outer protective layer from the inside out, characterized in that: The inner lining layer comprises the following components in parts by weight: 100 parts by weight of epoxy resin Liquid-terminated carboxyl-terminated nitrile butadiene rubber, 8-12 parts by weight 3-5 parts by weight of core-shell polymer microparticles Nano-silica 2-4 parts by weight 5-8 parts by weight of conductive carbon black Aromatic amine curing agent 50-90 parts by weight Accelerator 1-2 parts by weight; The structural reinforcement layer comprises the following components in parts by weight: 100 parts by weight of epoxy resin Carbon fiber 200-300 parts by weight Aramid fiber 50-100 parts by weight Microencapsulated red phosphorus flame retardant 60-90 parts by weight Carbon nanotubes 1-3 parts by weight; The outer protective layer comprises the following components in parts by weight: 100 parts by weight of epoxy resin Aluminum hydroxide flame retardant, 15-20 parts by weight Wear-resistant filler 15-25 parts by weight Conductive carbon black and conductive metal oxide powder, 8-12 parts by weight Surfactant antistatic agent 2-4 parts by weight UV absorber 5-10 parts by weight Anti-aging agent 2-8 parts by weight.
2. The high-pressure resistant epoxy resin water pipeline for mining as described in claim 1, characterized in that: The epoxy resin is a mixture of bisphenol A type epoxy resin and phenolic epoxy resin, with a mass ratio of 70:30 between the bisphenol A type epoxy resin and the phenolic epoxy resin. The core-shell polymer particles are polybutadiene-styrene-methyl methacrylate.
3. The high-pressure resistant epoxy resin water pipeline for mining as described in claim 1, characterized in that: The structural reinforcement layer combines circumferential and helical winding of carbon fiber and aramid fiber. Circumferential winding mainly uses carbon fiber, while helical winding uses alternating layers of carbon fiber and aramid fiber. The circumferential winding angle is 85°–90°, and the helical winding angle is 15°–20°.
4. The high-pressure resistant epoxy resin water pipeline for mining as described in claim 1, characterized in that: The thickness of the inner lining layer is 0.3-0.5 mm, and the thickness of the outer protective layer is 0.8-1.2 mm.
5. A high-pressure resistant epoxy resin water pipeline for mining as described in claim 1, characterized in that: The outer surface of the inner lining layer is provided with fine thread patterns, and the outer surface of the outer protective layer is provided with an orange peel texture.
6. A high-pressure resistant epoxy resin water pipeline for mining as described in claim 1, characterized in that: The wear-resistant filler in the outer protective layer is silicon carbide or aluminum oxide.
7. The manufacturing process of a high-pressure resistant epoxy resin water pipeline for mining as described in any one of claims 1, 2, 3, 4, 5, or 6, characterized in that... Includes the following steps: Step 1 Inner Liner Preparation The inner liner is prepared by centrifugal casting. A mixture consisting of 100 parts by weight of epoxy resin, 8-12 parts by weight of liquid carboxyl-terminated nitrile rubber, 3-5 parts by weight of core-shell polymer microparticles, 2-4 parts by weight of nano-silica, 5-8 parts by weight of conductive carbon black, 50-90 parts by weight of aromatic amine curing agent, and 1-2 parts by weight of accelerator is injected into a rotating mold. Under centrifugal force, a uniform and defect-free inner liner is formed. The inner liner is then placed on a mandrel. The curing degree of the inner liner is controlled at 85%-90% to maintain a certain reactivity, which facilitates a strong chemical bond with the structural reinforcement layer. Step 2: Fabrication of the structural reinforcement layer The structural reinforcement layer is prepared using a wet winding process. A computer-controlled four-axis winding machine achieves precise fiber layup. Before production, the winding profile is designed based on the pipe diameter and pressure rating, determining parameters such as winding angle, yarn width, and winding tension. During preparation, 200-300 parts by weight of carbon fiber and 50-100 parts by weight of aramid fiber are passed through a resin impregnation tank containing a mixture of 100 parts by weight of epoxy resin, 60-90 parts by weight of microencapsulated red phosphorus flame retardant, and 1-3 parts by weight of carbon nanotubes. The mixture is then wound onto the inner lining layer via a guide head along a pre-defined path. During winding, fiber tension is precisely controlled: 20-25 N for circumferential winding and 15-20 N for helical winding, maintained constant through a closed-loop tension control system to prevent fiber loosening or over-tension. Environmental conditions are strictly controlled during winding, with temperature maintained at 23±2℃ and relative humidity controlled at 50%±10%. To prevent temperature fluctuations from causing changes in resin viscosity and affecting fiber impregnation, each layer is compacted with a compaction roller to remove air bubbles and ensure good interlayer bonding. Fiber position, resin content, and layer thickness are monitored in real time throughout the winding process to ensure the product meets design requirements. Step 3: Preparation of the outer protective layer A mixture of 100 parts by weight epoxy resin, 15-20 parts by weight aluminum hydroxide flame retardant, 15-25 parts by weight wear-resistant filler, 8-12 parts by weight conductive carbon black and metal oxide conductive powder, 2-4 parts by weight surfactant antistatic agent, 5-10 parts by weight ultraviolet absorber, and 2-8 parts by weight anti-aging agent is sprayed onto the outer wall of the structural reinforcement layer before curing. Curing employs a staged programmed temperature curing process. The curing cycle consists of three steps: a gel stage, a curing stage, and a post-curing stage. The gel stage is carried out at 80℃ for 2 hours. During this stage, the resin viscosity gradually decreases and then rapidly increases, eventually reaching a gel state. This stage uses a slow heating method, with the heating rate controlled at 0.5-1℃ / min. To prevent the rapid release of volatiles and the formation of bubbles, the curing stage is carried out at 120℃ for 4 hours. During this stage, the cross-linking reaction of the resin is basically completed, and the pipe acquires most of its mechanical properties. The post-curing stage is carried out at 150℃ for 2 hours. This stage aims to increase the cross-linking density of the resin, especially the curing degree of phenolic epoxy resin, thereby improving the heat resistance and long-term service performance of the pipe. During the curing process, the mold is kept rotating at a uniform speed (5-10 rpm) to prevent the resin from flowing under gravity and to ensure uniform wall thickness. For large-diameter pipes (>300 mm), a low air pressure (0.2-0.5 MPa) needs to be applied inside the pipe to support the pipe structure and prevent deformation during the curing process. After curing, a programmed cooling method is used, with the cooling rate controlled at 1-2℃ / min, until 60℃ is reached. Step 4: Demolding After the tube is wrapped and sprayed, remove the tube from the mandrel.