Basalt fiber reinforced pipe and 3D printing forming method thereof

Abstract

The invention discloses a basalt fiber reinforced pipe and a 3D printing forming method thereof, and relates to the technical field of pipe manufacturing. The basalt fiber reinforced pipe is prepared from the following raw materials in parts by weight: 27 to 35 parts of thermosetting resin, 45 to 59 parts of continuous basalt fiber, 9 to 23 parts of chopped basalt fiber, 0.1 to 0.5 part of basalt fiber surfacing felt, 0.1 to 0.5 part of resin surfacing felt, 1 to 4 parts of curing agent and 0.2 to 0.6 part of accelerant, according to the basalt fiber reinforced pipe, thermosetting resin serves as a base material, and continuous basalt fibers wound in the annular direction and short-cut basalt fibers distributed in a three-dimensional mode serve as reinforcing materials. The basalt fiber reinforced pipe has remarkable salt resistance and corrosion resistance, can replace existing steel pipes, HDPE pipes and the like for radioactive waste liquid discharge, water taking and water drainage of a nuclear power plant, and achieves the multiple purposes of environment friendliness, weight reduction, quality improvement, corrosion resistance improvement and the like.

Description

Technical Field

[0001] The present application relates to the technical field of pipe manufacturing, and in particular to a basalt fiber reinforced pipe and a 3D printing method thereof. Background Art

[0002] Basalt fiber is the only environmentally friendly glass fiber product so far. It is made of a kind of volcanic eruptive rock (including basalt and basaltic andesite) formed by volcanic eruption condensation as raw material. It is a continuous fiber quickly drawn after high-temperature melting. It is taken from natural ore without any additives. The main components are SiO2 and metal ion compounds. The composite material made of basalt fiber as a reinforcing material has outstanding temperature resistance, high tensile strength, excellent resistance to seawater and chemical media, and certain radar stealth performance. At present, the carbon steel pipes used in the radioactive waste liquid discharge system and the three-circuit water system of nuclear power plants have problems such as corrosion, scaling, aging and maintenance; some power plants have been upgraded to use high-density polyethylene (HDPE) pipes, but there are still high transportation and installation costs, manufacturing process restrictions, limited application scenarios, and high prices for the pipes themselves. At present, in order to solve the problem of defects of steel pipes and HDPE pipes, new materials are expected to be used instead. Basalt fiber materials are lighter in weight, more corrosion-resistant, more environmentally friendly, and have better mechanical properties. 3D printed basalt fiber pipes resistant to seawater corrosion and radiation, as well as pipe fittings for outdoor construction connections, are developed using basalt fiber materials. They can provide more options for nuclear power plant radioactive waste liquid discharge pipes, seawater intake pipes, and non-sewage drainage pipes, and replace traditional discharge pipes and intake pipes. Based on this, this application proposes a basalt fiber reinforced pipe and a 3D printing method thereof. Summary of the invention

[0003] The main purpose of this application is to provide a basalt fiber reinforced pipe and its 3D printing method, aiming to solve the technical problem that existing steel pipes and HDPE pipes cannot meet the requirements for use of nuclear power plant discharge pipes and water intake pipes.

[0004] To achieve the above object, the present application proposes a basalt fiber reinforced pipe, which includes the following raw materials by weight: 27-35 parts of thermosetting resin, 45-59 parts of continuous basalt fiber, 9-23 parts of chopped basalt fiber, 0.1-0.5 parts of basalt fiber surface felt, 0.1-0.5 parts of resin surface felt, 1-4 parts of curing agent and 0.2-0.6 parts of accelerator;

[0005] The basalt fiber reinforced pipe uses the thermosetting resin as a matrix material, and uses the hoop-wound continuous basalt fibers and the three-dimensionally distributed chopped basalt fibers as reinforcement materials.

[0006] Optionally, the linear density of the continuous basalt fiber is one of 590tex-610tex, 2280tex-2520tex or 4680tex-4920tex.

[0007] Optionally, the chopped basalt fibers are obtained by directly cutting the continuous basalt fibers with a cutter during 3D printing and mixing them into the printed and wound tubular structure. The length of the chopped basalt fibers is 30 mm-50 mm, and the linear density is 590 tex-610 tex, 2280 tex-2520 tex or 4680 tex-4920 tex.

[0008] Optionally, the thickness of the basalt fiber surface felt is 0.30 mm-0.40 mm, and the surface density of the basalt fiber surface felt is 27 g / m 2 -33g / m 2 The thickness of the resin surface felt is 0.09mm-0.13mm, and the surface density of the resin surface felt is 23g / m 2 -29g / m 2 .

[0009] Optionally, the thermosetting resin includes at least one of isophthalic resin, orthophthalic resin, vinyl resin and epoxy resin.

[0010] Optionally, the curing agent includes one of methyl ethyl ketone peroxide, dimethyl phthalate and methyl ethyl ketone; and the accelerator includes cobalt acetate.

[0011] Optionally, the basalt fiber reinforced pipe comprises an inner lining layer, a structural layer and an outer surface layer;

[0012] The raw materials of the inner lining layer include thermosetting resin, chopped basalt fibers and basalt fiber surface felt;

[0013] The raw materials of the structural layer include thermosetting resin, continuous basalt fiber and chopped basalt fiber;

[0014] The raw materials of the outer layer include thermosetting resin, chopped basalt fibers and resin surface felt.

[0015] The present application also proposes a method for preparing a basalt fiber reinforced pipe, comprising the following steps:

[0016] A continuous output mold is used and preheated, thermosetting resin and basalt fiber surface felt are sequentially added into the feeding area of ​​the printing device, and the lining cutting yarn device is turned on to embed the short chopped basalt fiber, and then a curing agent and an accelerator are added for curing and molding to obtain the lining layer;

[0017] Then, the inner lining layer is pushed outward, thermosetting resin and continuous basalt fiber are sequentially added into the feeding area of ​​the printing device, the structural cutting yarn device is turned on, the continuous basalt fiber is circumferentially reciprocated, and the inner lining cutting yarn device is turned on to embed the chopped basalt fiber, and the structural layer is printed on the inner lining layer;

[0018] Continue to push outward, put thermosetting resin and resin surface felt in the feeding area of ​​the printing device in turn, and embed short chopped basalt fibers by the lining cutting yarn device, and print the outer surface layer on the structural layer;

[0019] After being integrally solidified and formed, the inner lining layer, the structural layer and the outer surface layer enter the cutting and grinding zone, where they are cut and ground according to the set length and the socket size to obtain a basalt fiber reinforced pipe.

[0020] Optionally, in the step of using a continuously output mold and preheating the mold, the preheating temperature of the mold is 80°C-100°C.

[0021] Optionally, in the pushing outward step, the pushing speed is 6mm / s-7mm / s.

[0022] This application has at least the following beneficial effects:

[0023] The basalt fiber reinforced pipe of the present application adopts thermosetting resin, continuous basalt fiber, chopped basalt fiber, basalt fiber surface felt, resin surface felt, curing agent and accelerator as raw materials, thermosetting resin as matrix material, hoop-wound continuous basalt fiber and three-dimensionally distributed chopped basalt fiber as reinforcing materials, forming a three-dimensional reinforced pipe wall structure, and the pipe wall adopts two reinforcement methods of hoop-wound continuous fiber and three-dimensionally distributed chopped fiber at the same time, and the pipe wall is connected into a whole by the chopped basalt fiber, which overcomes the defects of the interlayer structure, and adopts the 3D printing molding method, which can make the multi-layer structure printed at the same time and continuously printed, further ensuring the integrity of the pipe and achieving the effect of reinforcing the pipe, and because the basalt fiber material has high strength, high modulus, high and low temperature resistance, acid and alkali resistance, oxidation resistance, The basalt fiber reinforced pipe of the present application has excellent properties such as radiation resistance, heat insulation and sound insulation, fire retardancy, high compression strength and shear strength, which makes it have significant salt resistance and corrosion resistance, and can be applied to radioactive waste liquid discharge pipes. There is no need to add additional anti-corrosion protection during engineering use, and it meets the use requirements of nuclear power waste liquid discharge pipes, drainage pipes and water intake pipes. In addition, it has high design flexibility. Large pipes with a diameter of more than 3000mm can be directly manufactured on site, and the length of the pipe can be made as needed, which is convenient for transportation and installation and saves related costs. The weight of basalt fiber pipes of the same specification, length and pressure level can be reduced by 25%-120% compared with ordinary steel pipes and PE pipes. It can replace the current steel pipes, HDPE pipes, etc. for radioactive waste liquid discharge, water intake and drainage in nuclear power plants, and achieve multiple goals such as environmental friendliness, weight reduction and quality improvement, and improved pipeline corrosion resistance. At the same time, the pipe leakage monitoring system uses optical fiber as a sensor detection system, and directly wraps the optical fiber and continuous basalt fiber into the pipe body, which can accurately locate the leakage point, with reliable monitoring and low error rate. It also has the advantages of low cost, long life, simple operation and maintenance, and agile transmission of perception information. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the basalt fiber reinforced pipe described in Example 1 of the present application;

[0026] Figure 2 This is a schematic diagram of the structure of the basalt fiber reinforced sleeve described in Example 2 of the present application.

[0027] Reference numerals:

[0028] 1- lining layer; 2- structural layer; 21- pipe inner structural layer; 22- pipe main structural layer; 23- pipe outer structural layer; 24- sleeve main structural layer; 25- sleeve outer structural layer; 3- outer surface layer.

[0029] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] In view of the technical problems existing in the prior art, the embodiment of the present application provides a basalt fiber reinforced pipe, which includes the following raw materials by weight: 27-35 parts of thermosetting resin, 45-59 parts of continuous basalt fiber, 9-23 parts of chopped basalt fiber, 0.1-0.5 parts of basalt fiber surface felt, 0.1-0.5 parts of resin surface felt, 1-4 parts of curing agent and 0.2-0.6 parts of accelerator;

[0032] The basalt fiber reinforced pipe uses the thermosetting resin as a matrix material, and uses the hoop-wound continuous basalt fibers and the three-dimensionally distributed chopped basalt fibers as reinforcement materials.

[0033] The basalt fiber reinforced pipe of the present application adopts thermosetting resin, continuous basalt fiber, chopped basalt fiber, basalt fiber surface felt, resin surface felt, curing agent and accelerator as raw materials, thermosetting resin as matrix material, and hoop-wound continuous basalt fiber and three-dimensionally distributed chopped basalt fiber as reinforcement materials, forming a three-dimensional reinforced pipe wall structure, and the pipe wall adopts two reinforcement methods of hoop-wound continuous fiber and three-dimensionally distributed chopped fiber at the same time, and the pipe wall is connected into a whole by the chopped basalt fiber, thereby overcoming the defects of the interlayer structure, and because the basalt fiber material has excellent characteristics such as high strength, high modulus, high and low temperature resistance, acid and alkali resistance, oxidation resistance, radiation resistance, heat insulation and sound insulation, fire retardancy, high compression strength and high shear strength The basalt fiber reinforced pipe of the present application has significant salt resistance and corrosion resistance, and can be applied to radioactive waste liquid discharge pipes. There is no need to add additional anti-corrosion protection during engineering use, and it meets the use requirements of nuclear power waste liquid discharge pipes, drainage pipes and water intake pipes. In addition, its design is highly flexible. Large pipes with a diameter of more than 3000mm can be directly manufactured on site, and the length of the pipe can be made as needed, which is convenient for transportation and installation and saves related costs. The weight of basalt fiber pipes of the same specification, length and pressure level can be reduced by 25%-120% compared with ordinary steel pipes and PE pipes. It can replace the current steel pipes, HDPE pipes, etc. for radioactive waste liquid discharge, water intake and drainage in nuclear power plants, and achieve multiple goals such as environmental friendliness, weight reduction and quality improvement, and improved pipeline corrosion resistance.

[0034] Specifically, the basalt fiber reinforced pipe may include a main pipe, pipe fittings (elbows, flanges or blind plates, tees or crosses, reducers, etc.) and sleeve joints.

[0035] As an implementation method of the present application, the linear density of the continuous basalt fiber is one of 590tex-610tex, 2280tex-2520tex or 4680tex-4920tex.

[0036] Specifically, the linear density of basalt fiber, also called tex, refers to the weight in grams of 1000-meter-long yarn at a specified moisture regain. The linear density of basalt fiber has a wide range, ranging from 68tex to 9600tex. According to different application requirements, basalt fibers with different linear densities can be selected. The linear density specifications of the continuous basalt fiber used in this application are 590tex-610tex, 2280tex-2520tex or 4680tex-4920tex.

[0037] As an implementable embodiment of the present application, the chopped basalt fiber is directly cut by a cutter during the 3D printing process, and the continuous basalt fiber is mixed into the printed and wound pipe structure. The length of the chopped basalt fiber is 30mm-50mm, and the linear density is 590tex-610tex, 2280tex-2520tex or 4680tex-4920tex.

[0038] The chopped basalt fibers of the present application can be embedded into the tube structure after the continuous basalt fibers are cut by the cutter of the yarn cutting device during the 3D printing process, so that they are three-dimensionally distributed in the tube structure, thereby connecting the tube wall with a multi-layer structure into a whole to overcome the defects of the interlayer structure.

[0039] As an implementation method of the present application, the thickness of the basalt fiber surface felt is 0.30 mm-0.40 mm, and the surface density of the basalt fiber surface felt is 27 g / m 2 -33g / m 2 The thickness of the resin surface felt is 0.09mm-0.13mm, and the surface density of the resin surface felt is 23g / m 2 -29g / m 2 .

[0040] Specifically, basalt fiber surface felt is a thin felt produced by papermaking process with basalt chopped fibers or basalt chopped fibers and other chopped fibers as main raw materials. Basalt fiber surface felt has the characteristics of uniform fiber dispersion, good processing performance, smooth surface, stable size, fast resin impregnation speed, good paving, high strength and corrosion resistance. It can be compounded with resin to give the product a bright and smooth surface, while improving the interlaminar shear strength, weather resistance, water resistance and corrosion resistance of the product; the specific physical and chemical properties of resin surface felt are widely used in many fields, including automobiles, consumer products, chemical containers, electronic products and fuel cell diaphragms, etc. Its surface density ranges from 6g / m 2 -100g / m 2 The variability of its surface density enables it to adapt to different application requirements and provide excellent performance. Preferably, the surface density of the basalt fiber surface felt used in this application is 30g / m 2 The surface density of the resin felt is 26g / m 2 , which is used in pipes in combination with reinforcing materials to improve the durability and corrosion resistance of the pipes.

[0041] As an implementation method of the present application, the thermosetting resin includes at least one of isophthalic resin, orthophthalic resin, vinyl resin and epoxy resin.

[0042] Specifically, thermosetting resin has excellent comprehensive properties, including high strength, good heat resistance, excellent electrical properties, corrosion resistance, aging resistance, good dimensional stability, etc. After being cured under the action of a curing agent and an accelerator, it can form a network structure due to intermolecular crosslinking, making it have the characteristics of high rigidity, high hardness, high temperature resistance, and non-flammability, so that the formed pipe product has good stability and excellent performance. The thermosetting resin used in this application is preferably an isophthalic resin.

[0043] As an implementation method of the present application, the curing agent includes one of methyl ethyl ketone peroxide, dimethyl phthalate and methyl ethyl ketone; and the accelerator includes cobalt acetate.

[0044] Specifically, the curing agent is a substance or mixture that enhances or controls the curing reaction. The curing process of the thermosetting resin must go through chemical reactions such as condensation, ring closure, addition or catalysis to cause the thermosetting resin to undergo irreversible changes. During the curing reaction of the thermosetting resin, a curing agent and an accelerator are required to promote the curing 3D printing process of the thermosetting resin.

[0045] As an implementation method of the present application, the basalt fiber reinforced pipe includes an inner lining layer, a structural layer and an outer surface layer;

[0046] The raw materials of the inner lining layer include thermosetting resin, chopped basalt fibers and basalt fiber surface felt;

[0047] The raw materials of the structural layer include thermosetting resin, continuous basalt fiber and chopped basalt fiber;

[0048] The raw materials of the outer layer include thermosetting resin, chopped basalt fibers and resin surface felt.

[0049] The embodiment of the present application also provides a method for preparing a basalt fiber reinforced pipe, comprising the following steps:

[0050] A continuous output mold is used and preheated, thermosetting resin and basalt fiber surface felt are sequentially added into the feeding area of ​​the printing device, and the lining cutting yarn device is turned on to embed the short chopped basalt fiber, and then a curing agent and an accelerator are added for curing and molding to obtain the lining layer;

[0051] Then, the inner lining layer is pushed outward, thermosetting resin and continuous basalt fiber are sequentially added into the feeding area of ​​the printing device, the structural cutting yarn device is turned on, the continuous basalt fiber is circumferentially reciprocated, and the inner lining cutting yarn device is turned on to embed the chopped basalt fiber, and the structural layer is printed on the inner lining layer;

[0052] Continue to push outward, put thermosetting resin and resin surface felt in the feeding area of ​​the printing device in turn, and embed short chopped basalt fibers by the lining cutting yarn device, and print the outer surface layer on the structural layer;

[0053] After being integrally solidified and formed, the inner lining layer, the structural layer and the outer surface layer enter the cutting and grinding zone, where they are cut and ground according to the set length and the socket size to obtain a basalt fiber reinforced pipe.

[0054] The present application first uses a thermosetting resin as the matrix material of the inner lining layer, and simultaneously puts in a basalt fiber surface felt, and embeds short basalt fibers through a cutting yarn device, and then uses a curing agent and an accelerator to promote the curing and molding of the thermosetting resin, thereby printing out the inner lining layer; then uses a thermosetting resin as the matrix material of the structural layer, and makes the continuous basalt fibers circumferentially reciprocally wound on the structural layer resin, and simultaneously embeds short basalt fibers, and prints out the structural layer on the inner lining layer; then uses a thermosetting resin as the matrix material of the outer layer, and simultaneously puts in a resin surface felt, and Chopped basalt fibers are embedded and the outer layer is printed on the structural layer. The materials and amounts of the lining layer, structural layer and outer layer are discharged at one time by the control mechanism and solidified in the printing device as a whole, thereby ensuring the integrity of the pipe. The pipe wall is connected into a whole through the annular continuous fibers and the three-dimensionally distributed chopped fibers, overcoming the defects of the interlayer structure. The design is highly flexible and can be printed continuously. Pipes of the required size specifications can be printed quickly and accurately, and can be modified and adjusted at any time during the design process, greatly shortening the production cycle and cost.

[0055] Specifically, 3D printing curing molding is achieved by adding curing agent and accelerator to thermosetting resin to cause curing and cross-linking reaction. The bond strength between the resin molecular chains will increase, and a solid structure will gradually be formed. When a layer of resin is completely cured, the printing platform will move up a layer, and the above process will be repeated until the entire tube is printed.

[0056] As an implementable embodiment of the present application, in the step of using a continuously output mold and preheating the mold, the preheating temperature of the mold is 80°C-100°C.

[0057] As an implementable embodiment of the present application, in the step of pushing outward, the pushing speed is 6mm / s-7mm / s.

[0058] As an implementable embodiment of the present application, a fluid leakage monitoring system is added to the pipe. The pipe leakage monitoring system uses optical fiber as a sensor detection, introduces an incident pulse through a laser, and is equipped with pulse modulation to amplify the signal. The sensor optical fiber receives vibration, temperature, humidity, elements and other information. The received information is collected and identified by a central processing unit and transmitted to a terminal to realize the monitoring of fluid leakage in the pipe. The method of introducing optical fiber into the pipe is to replace the continuous basalt fiber in part of the structural layer with optical fiber, and directly wind the optical fiber and the continuous basalt fiber into the pipe body, which can accurately locate the leakage point, and the monitoring is reliable and the error rate is low. In addition, the system also has the advantages of low cost, long life, simple operation and maintenance, and agile and efficient transmission of perception information.

[0059] It should be noted that basalt fiber reinforced pipes with a diameter exceeding 3000mm can be directly manufactured on site, thus solving the problem of difficulty in transporting large-diameter pipes.

[0060] It should be noted that for pipelines manufactured on site, the maximum length straight pipe can be printed according to the site conditions to reduce the use of pipe joints and further reduce joint leakage problems.

[0061] It should be noted that the nominal diameter and pressure of basalt fiber reinforced pipes are manufactured in accordance with the standard requirements of composite material pipes. The specifications of basalt fiber reinforced pipes can correspond to the existing steel pipes and HDPE pipes in nuclear power plants, and there are a variety of sizes to choose from.

[0062] The above technical solution of the present application is described in detail below in conjunction with specific embodiments.

[0063] Example 1

[0064] A 3D printing molding method for a basalt fiber reinforced pipe, taking a basalt fiber reinforced pipe with an inner diameter of 987.9 mm, an outer diameter of 1026.0 mm, and a length of 12000 mm as an example, comprises the following steps:

[0065] A continuously output mold is used and preheated to 90°C. The isophthalic resin and basalt fiber surface felt are sequentially added into the feeding area of ​​the printing device, and the lining cutting yarn device is turned on to embed the short basalt fiber, and then the curing agent methyl ethyl ketone peroxide and the accelerator cobalt acetate are added for curing and molding to obtain the lining layer 1; wherein, the thickness of the basalt fiber surface felt is 0.35 mm, and the surface density is 30 g / m 2 ;

[0066] Then push the inner lining layer 1 outward at a speed of 6 mm / s, put isophthalic resin and continuous basalt fiber into the feeding area of ​​the printing device in sequence, start the structural cutting yarn device, perform hoop-reciprocating winding on the continuous basalt fiber, start the inner lining cutting yarn device to embed the short chopped basalt fiber, and print the structural layer 2 on the inner lining layer 1;

[0067] like Figure 1 As shown, the structural layer 2 includes a pipeline inner structural layer 21, a pipeline main structural layer 22 and a pipeline outer structural layer 23. The linear density of the continuous basalt fiber and the chopped basalt fiber in the pipeline inner structural layer 21 is 2400 tex, and the printing thickness is 3.5 mm; the linear density of the continuous basalt fiber and the chopped basalt fiber in the pipeline main structural layer 22 is 600 tex, and the printing thickness is 15.3 mm; the linear density of the continuous basalt fiber and the chopped basalt fiber in the pipeline outer structural layer 23 is 2400 tex, and the printing thickness is 3.5 mm;

[0068] Then, the speed of 6 mm / s is maintained and the push is continued. The isophthalic resin and the resin surface felt are sequentially put into the feeding area of ​​the printing device, and the chopped basalt fiber is embedded by the lining cutting yarn device, and the outer surface layer 3 is printed on the structural layer 2; the thickness of the resin surface felt is 0.11 mm, and the surface density is 26 g / m 2 ;

[0069] Among them, the length of the chopped basalt fiber is 40 mm;

[0070] After being integrally solidified and formed, the inner lining layer 1, the structural layer 2 and the outer surface layer 3 enter the cutting and grinding area, where they are cut and ground according to the set length and the socket size to obtain a basalt fiber reinforced pipe.

[0071] Before the pipeline leaves the factory, it is necessary to carry out pipeline inspection, including appearance quality, dimension measurement, verticality of pipe end face, Barcol hardness, insoluble content of resin, mass percentage of pipe wall components, initial mechanical properties, long-term performance, water pressure leakage, and seismic resistance test.

[0072] After testing, the pipeline obtained in this embodiment has a stiffness of 11344N, a hoop elastic modulus of 14006MPa, and an axial elastic modulus of 5545MPa.

[0073] Example 2

[0074] A 3D printing molding method for a basalt fiber reinforced pipe, taking a basalt fiber reinforced sleeve with an inner diameter of 1028.5 mm, an outer diameter of 1076.5 mm, and a length of 5000 mm as an example, comprises the following steps:

[0075] A continuous output mold is used and preheated to 85°C. Phthalate resin and basalt fiber surface felt are sequentially added into the feeding area of ​​the printing device. The lining cutting yarn device is turned on to embed short-cut basalt fibers with a linear density of 600 tex. Then, a curing agent, dimethyl phthalate, and an accelerator, cobalt acetate, are added for curing and molding to obtain an inner lining layer 1. The thickness of the basalt fiber surface felt is 0.32 mm and the surface density is 27 g / m 2 ;

[0076] Then push the inner lining layer 1 outward at a speed of 7 mm / s, put the orthophthalic resin and the continuous basalt fiber into the feeding area of ​​the printing device in turn, start the structural cutting yarn device, perform hoop-reciprocating winding on the continuous basalt fiber, start the inner lining cutting yarn device to embed the short chopped basalt fiber, and print the structural layer 2 on the inner lining layer 1;

[0077] like Figure 2 As shown, the structural layer 2 includes a sleeve main structural layer 24 and a sleeve outer structural layer 25. The linear density of the continuous basalt fiber and the short basalt fiber in the sleeve main structural layer 24 is 600 tex, and the printing thickness is 16.0 mm; the linear density of the continuous basalt fiber and the short basalt fiber in the sleeve outer structural layer 25 is 2400 tex, and the printing thickness is 11.7 mm.

[0078] Then, the speed of 7 mm / s is maintained and the push is continued. The phthalic resin and the resin surface felt are sequentially put into the feeding area of ​​the printing device, and the chopped basalt fiber is embedded by the lining cutting yarn device, and the outer surface layer 3 is printed on the structural layer 2; the thickness of the resin surface felt is 0.09 mm, and the surface density is 23 g / m 2 ;

[0079] Among them, the length of the chopped basalt fiber is 50 mm;

[0080] After being integrally solidified and formed, the inner lining layer 1, the structural layer 2 and the outer surface layer 3 enter the cutting and grinding area, where they are cut and ground according to the set length and the socket size to obtain a basalt fiber reinforced sleeve.

[0081] The sleeve needs to be tested for joints before leaving the factory. The main test items include initial leakage, external pressure change, internal pressure under lateral load, internal pressure under bending, and short-term water pressure.

[0082] After testing, the basalt fiber reinforced sleeve prepared in this embodiment has a stiffness of 11969N, a hoop elastic modulus of 12972MPa, and an axial elastic modulus of 3060MPa.

[0083] The above description is only an optional embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the inventive concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A basalt fiber reinforced pipe, characterized in that: By weight, it includes the following raw materials: 27-35 parts of thermosetting resin, 45-59 parts of continuous basalt fiber, 9-23 parts of chopped basalt fiber, 0.1-0.5 parts of basalt fiber surface felt, 0.1-0.5 parts of resin surface felt, 1-4 parts of curing agent and 0.2-0.6 parts of accelerator; The basalt fiber reinforced pipe uses the thermosetting resin as a matrix material, and uses the hoop-wound continuous basalt fibers and the three-dimensionally distributed chopped basalt fibers as reinforcement materials.

2. The basalt fiber reinforced pipe according to claim 1, characterized in that: The linear density of the continuous basalt fiber is one of 590tex-610tex, 2280tex-2520tex or 4680tex-4920tex.

3. The basalt fiber reinforced pipe according to claim 1, characterized in that: The chopped basalt fibers are directly cut by a cutter during the 3D printing process and mixed into the printed and wound pipe structure. The length of the chopped basalt fibers is 30 mm-50 mm, and the linear density is 590 tex-610 tex, 2280 tex-2520 tex or 4680 tex-4920 tex.

4. The basalt fiber reinforced pipe according to claim 1, characterized in that: The thickness of the basalt fiber surface felt is 0.30mm-0.40mm, and the surface density of the basalt fiber surface felt is 27g / m 2 -33g / m 2 The thickness of the resin surface felt is 0.09mm-0.13mm, and the surface density of the resin surface felt is 23g / m 2 -29g / m 2 .

5. The basalt fiber reinforced pipe according to claim 1, characterized in that: The thermosetting resin includes at least one of isophthalic resin, orthophthalic resin, vinyl resin and epoxy resin.

6. The basalt fiber reinforced pipe according to claim 1, characterized in that: The curing agent includes one of methyl ethyl ketone peroxide, dimethyl phthalate and methyl ethyl ketone; and the accelerator includes cobalt acetate.

7. The basalt fiber reinforced pipe according to claim 1, characterized in that: The basalt fiber reinforced pipe comprises an inner lining layer, a structural layer and an outer surface layer; The raw materials of the inner lining layer include thermosetting resin, chopped basalt fibers and basalt fiber surface felt; The raw materials of the structural layer include thermosetting resin, continuous basalt fiber and chopped basalt fiber; The raw materials of the outer layer include thermosetting resin, chopped basalt fibers and resin surface felt.

8. The 3D printing method for basalt fiber reinforced pipe according to any one of claims 1 to 7, characterized in that: The following steps are involved: A continuous output mold is used and preheated, thermosetting resin and basalt fiber surface felt are sequentially added into the feeding area of ​​the printing device, and the lining cutting yarn device is turned on to embed the short chopped basalt fiber, and then a curing agent and an accelerator are added for curing and molding to obtain the lining layer; Then, the inner lining layer is pushed outward, thermosetting resin and continuous basalt fiber are sequentially added into the feeding area of ​​the printing device, the structural cutting yarn device is turned on, the continuous basalt fiber is circumferentially reciprocated, and the inner lining cutting yarn device is turned on to embed the chopped basalt fiber, and the structural layer is printed on the inner lining layer; Continue to push outward, put thermosetting resin and resin surface felt in the feeding area of ​​the printing device in turn, and embed short chopped basalt fibers by the lining cutting yarn device, and print the outer surface layer on the structural layer; After being integrally solidified and formed, the inner lining layer, the structural layer and the outer surface layer enter the cutting and grinding zone, where they are cut and ground according to the set length and the socket size to obtain a basalt fiber reinforced pipe.

9. The 3D printing method for basalt fiber reinforced pipe according to claim 8, characterized in that: In the step of using the continuous output mold and preheating, the preheating temperature of the mold is 80°C-100°C.

10. The 3D printing method for basalt fiber reinforced pipe according to claim 8, characterized in that: In the step of pushing outward, the pushing speed is 6mm / s-7mm / s.

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