Heat preservation and insulation basalt fiber polyethylene composite pipe

Abstract

The utility model discloses a heat preservation and insulation basalt fiber polyethylene composite pipe, relates to polyethylene composite pipe field, the composite pipe from inside to outside includes polyethylene layer, axial fiber layer, heat preservation layer, radial fiber layer, polyurea protective layer, axial fiber layer and radial fiber layer all adopt basalt fiber material. According to the structure, the strength of the composite pipe is enhanced, the thickness of the composite pipe can be reduced, the preparation difficulty and the transportation difficulty are reduced, and the cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of polyethylene composite pipes, in particular to a thermal insulation basalt fiber polyethylene composite pipe. Background Art

[0002] Pipeline thermal insulation is an indispensable part of industrial production and civil life, especially in the fields of energy, construction, petroleum, chemical industry, etc. The main purpose of pipeline thermal insulation is to reduce the heat loss of pipelines when conveying media and the influence of external temperature on the media in the pipelines, improve the thermal insulation performance of pipelines, and prevent energy waste and environmental problems caused by heat loss in pipelines.

[0003] Different pipe types and usage environments require different insulation methods. Existing insulation methods and materials include external insulation, lining insulation, and interlayer insulation. External insulation refers to building an insulation layer on the outside of the pipe to wrap the pipe. Lining insulation refers to adding insulation materials to the inside of the pipe, which can be directly installed on the inner wall of the pipe. The insulation layer is usually sandwiched between the pipe and the lining by color steel plates, which has the effect of insulation, moisture-proof and corrosion-resistant. Interlayer insulation refers to dividing the outer wrapping layer of the pipe into two layers, with corresponding insulation materials in the middle. The gap between the interlayers is usually insulated with steam or heat transfer fluid.

[0004] At the same time, most of the pressure-resistant pipes in the current market are made of thermoplastic materials, such as PE and PP. Most of the means to enhance the pressure resistance are to strengthen the outer layer, such as steel mesh reinforced PE, fiber reinforced PP, etc. However, due to the low strength of thermoplastic materials, the product thickness must reach a certain size to meet the working pressure requirements, and increasing the product thickness will increase the pressure in production, transportation and storage.

[0005] Therefore, the current pipeline structure and conventional materials cannot meet the requirements of the pressure-resistant pipeline to resist internal pressure. In addition, the existing pipeline thermal insulation process usually adds a thermal insulation layer outside the pipeline, which is difficult to construct, high in cost, and difficult to maintain in the later stage. Utility Model Content

[0006] One purpose of the utility model is to provide a thermal insulation basalt fiber polyethylene composite pipe to solve the problem of weak internal pressure resistance and thermal insulation of the polyethylene composite pipe.

[0007] This purpose is achieved by adopting the following technical solutions:

[0008] A thermal insulation basalt fiber polyethylene composite pipe comprises, from inside to outside, a polyethylene layer, an axial fiber layer, an insulation layer, a radial fiber layer, and a polyurea protective layer, wherein the fiber materials of the axial fiber layer and the radial fiber layer are both basalt fibers.

[0009] The axial fiber layer is a mesh structure formed by winding along the axial direction of the composite tube. The radial fiber layer is a spiral structure spirally wound on the composite tube. The distance between two adjacent fibers in the radial fiber layer is greater than or equal to 0. Preferably, the fibers in the radial fiber layer are located in the gap formed by the axial fiber layer.

[0010] The utility model adopts basalt fiber filaments to weave into an interlaced mesh structure along the axial direction of the composite pipe. At the same time, the basalt fiber filaments are spirally wound on the composite pipe, and radial and longitudinal interactions occur. From a physical structure point of view, the ring stiffness of this structure is higher than that of the existing pipe, and the ability to resist damage caused by external pressure and settlement is stronger. At the same time, the tensile strength and flexibility of the pipe are greatly improved.

[0011] Secondly, a method for preparing a thermal insulation basalt fiber polyethylene composite pipe comprises the following steps:

[0012] Extruding a polyethylene material through a die to obtain a tubular polyethylene layer;

[0013] Winding the braided fibers on the polyethylene layer along the axial direction of the composite tube to obtain an axial fiber layer;

[0014] During the process of weaving the axial fiber layer, a thermal insulation layer is sprayed on the axial fiber layer;

[0015] After spraying the insulation layer, spirally winding fibers on the insulation layer to obtain a radial fiber layer;

[0016] A polyurea protective layer is sprayed on the radial fiber layer to obtain a composite pipe.

[0017] After the polyurea protective layer is sprayed, the axial fiber layer, the thermal insulation layer, the radial fiber layer and the polyurea protective layer are solidified into an integrated structure, wherein the axial fiber layer is a single layer or multiple layers, the radial fiber layer is a single layer or multiple layers, and the spirally wound fibers in the radial fiber layer are single strands or multiple strands.

[0018] Among them, the thermal insulation layer of this structure is a nano-ceramic thermal insulation layer. Spraying the nano-ceramic high-temperature resistant thermal insulation coating on the basalt fiber filaments can effectively ensure the flame retardancy, high-temperature resistance, waterproofness, thermal insulation, wear resistance and mechanical strength of the pipeline. It has the advantages of light bulk density, good thermal stability, low thermal conductivity, small heat capacity, good resistance to mechanical vibration, small thermal expansion, and good thermal insulation performance. In addition, the axial fiber layer, thermal insulation layer, radial fiber layer, and polyurea protective layer are solidified into an integrated structure to form a superimposed layer-by-layer static spatial structure that does not generate heat convection and heat conduction, further improving the thermal insulation effect. The number of pores between the nano-ceramic thermal insulation layers increases, and the contact with the fiber filaments increases, thereby increasing the heat conduction path, hindering the heat conduction process, reducing heat convection, heat conduction and heat radiation, and improving thermal insulation performance.

[0019] At the same time, the polyurea protective layer can resist the influence of environmental factors such as ultraviolet rays and high temperature, and has the ability of anti-corrosion, anti-pollution, acid and alkali resistance. Polyurea coating has high elongation at break and strength, while maintaining good adhesion and wear resistance. In addition, it can be used for a long time within a certain temperature range and withstand short-term high temperature shock. Therefore, spraying the polyurea protective layer on the radial fiber layer allows the basalt fiber to have better airtightness, waterproofness, chemical resistance, wear resistance and pressure resistance.

[0020] Moreover, the axial fiber layer, thermal insulation layer, radial fiber layer and polyurea protective layer are solidified into an integrated structure, which can not only further improve the thermal insulation performance and pressure resistance, but also replace the reinforcement layer, thermal insulation layer and fixed layer to reduce the thickness of the pipeline, improve the strength of the winding braided layer, and solve the technical problem of too low thickness of the winding braided layer caused by the reinforcement layer, thermal insulation layer and fixed layer.

[0021] The nano-ceramic insulation layer and the polyurea protective layer are respectively applied to the basalt fiber to form the thermal insulation layer and the reinforcement layer of the composite pipe. Under the premise of ensuring the pressure resistance grade of the composite pipe, the thickness of the layer can be reduced to improve the economic benefits of the composite pipe. The quality of the composite pipe is reduced by 60% compared with the traditional polyethylene composite pipe, thereby reducing the energy consumption cost during long-distance transportation.

[0022] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0023] The utility model discloses a thermal insulation basalt fiber polyethylene composite pipe. Compared with the existing composite pipe, the outermost layer of the structure is directly protected by polyurea material, and does not need to be wrapped with epoxy resin and other materials, which effectively improves the strength of the composite pipe and reduces the thickness of the pipe.

[0024] The axial fiber layer, thermal insulation layer, radial fiber layer, and polyurea protective layer of this structure are solidified into an integrated structure. The thermal insulation layer is inside the composite pipe and solidified into an integrated structure with the fiber filaments. The two structures complement each other, which can not only further improve the strength of the pipeline, but also enhance the thermal insulation effect of the pipeline. The thermal insulation layer will not directly contact the material inside the pipeline, further improving the service life of the pipeline. At the same time, compared with the existing structure in which the thermal insulation layer is sandwiched between the pipeline and the lining by the color steel plate, this structure has better thermal insulation effect, simpler preparation process, and is more suitable for use in a wider range of fields.

[0025] Therefore, this structure not only enhances the strength of the composite pipe, but also reduces the thickness of the composite pipe, reduces the difficulty of preparation and transportation, and effectively reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0027] Figure 1 is a schematic diagram of the structure of the composite tube in Example 1;

[0028] Figure 2 Schematic diagram of the axial fiber layer and the radial fiber layer in Example 1.

[0029] Marks and corresponding parts names in the attached drawings:

[0030] 1-composite pipe, 2-polyethylene layer, 3-axial fiber layer, 4-thermal insulation layer, 5-radial fiber layer, 6-polyurea protective layer. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0032] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, the composite pipe 1 includes a polyethylene layer 2, an axial fiber layer 3, a thermal insulation layer 4, a radial fiber layer 5, and a polyurea protective layer 6 from the inside to the outside.

[0035] The fiber materials of the axial fiber layer 3 and the radial fiber layer 5 are both basalt fibers. The thermal insulation layer 4 is a nano-ceramic thermal insulation layer.

[0036] like Figure 2 As shown, the axial fiber layer 3 is a mesh structure formed by winding along the axial direction of the composite tube 1. During winding, the longitudinal weaving device winds the basalt fiber filaments back and forth along the axial direction of the composite tube 1, and then weaves them into a mesh structure.

[0037] The radial fiber layer 5 is a spiral structure spirally wound on the composite tube 1. Preferably, the fibers in the radial fiber layer 5 are located in the gap formed by the axial fiber layer 3. When the composite tube is in use and is subjected to internal pressure, the composite tube is prone to bulge at the gap of the mesh structure of the axial fiber layer and rupture at the gap of the mesh fiber filaments. The radial fiber layer of this structure is wound at the mesh gap of the axial fiber layer 3, which can further increase the force in the radial direction and improve the overall strength.

[0038] In some embodiments, the axial fiber layer 3 is a single layer or multiple layers. When the axial fiber layer 3 is multiple layers, each layer is in contact with each other, and the wound fiber filaments of each layer are interlaced with each other, so as to reduce the gap size between the multiple axial fiber layers.

[0039] In some embodiments, the radial fiber layer 5 is a single layer or multiple layers, and when the radial fiber layer 5 and the axial fiber layer 3 are multiple layers, they are overlapped along the radial direction of the pipe. At the same time, the spirally wound fibers in each radial fiber layer 5 are single strands or multiple strands, and when spirally wound, two strands of fiber filaments can be wound, or one strand of fiber filament can be wound.

[0040] In some embodiments, in each radial fiber layer 5, the distance between two adjacent wound fiber filaments is greater than or equal to 0, that is, the two adjacent wound fiber filaments may be in contact with each other or have a distance therebetween. The specific setting is adjusted according to the actual strength performance requirements of the pipeline.

[0041] Example 2

[0042] On the basis of the above embodiment, a method for preparing a thermal insulation basalt fiber polyethylene composite pipe comprises the following steps:

[0043] A polyethylene layer 2 in a tubular shape is obtained by extruding polyethylene material through a die; woven fibers are wound on the polyethylene layer 2 along the axial direction of the composite pipe 1 to obtain an axial fiber layer 3; during the weaving of the axial fiber layer 3, a thermal insulation layer 4 is sprayed on the axial fiber layer 3; after the thermal insulation layer 4 is sprayed, fibers are spirally wound on the thermal insulation layer 4 to obtain a radial fiber layer 5; a polyurea protective layer 6 is sprayed on the radial fiber layer 5 to obtain the composite pipe 1. After the polyurea protective layer 6 is sprayed, the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 are cured into an integrated structure.

[0044] Example 3

[0045] On the basis of the above embodiment, this embodiment includes a first composite tube, a second composite tube, a third composite tube and a fourth composite tube.

[0046] The first composite tube includes a polyethylene layer 2, an axial fiber layer 3, an insulation layer 4, a radial fiber layer 5, and a polyurea protective layer 6 from the inside to the outside. Among them, the fiber materials of the axial fiber layer 3 and the radial fiber layer 5 are both basalt fibers. The insulation layer 4 is a nano-ceramic insulation layer, and the first composite tube is prepared by the preparation method of Example 2. Among them, the axial fiber layer 3 and the radial fiber layer 5 are both single layers, and the spirally wound fibers in the radial fiber layer 5 of each layer are single-strand fiber filaments. The distance between two adjacent fiber filaments in the radial fiber layer 5 of each layer is 0.5 cm.

[0047] The second composite pipe includes a polyethylene layer 2, an axial fiber layer 3, an insulation layer 4, and a polyurea protective layer 6 from the inside to the outside. The polyethylene material is extruded through a die to obtain a tubular polyethylene layer 2; the axial fiber layer 3 is obtained by winding woven fibers on the polyethylene layer 2 along the axial direction of the composite pipe 1; during the process of weaving the axial fiber layer 3, the insulation layer 4 is sprayed on the axial fiber layer 3; after spraying the insulation layer 4, the polyurea protective layer 6 is sprayed to obtain the second composite pipe. Among them, the fiber materials of the axial fiber layer 3 are all basalt fibers. The insulation layer 4 is a nano-ceramic insulation layer, and the axial fiber layer 3 is a single layer.

[0048] The third composite pipe is an existing polyethylene composite pipe.

[0049] The fourth composite pipe includes a polyethylene layer 2, an axial fiber layer 3, a thermal insulation layer 4, a radial fiber layer 5, and an epoxy resin layer from the inside to the outside. The fiber materials of the axial fiber layer 3 are all basalt fibers. The thermal insulation layer 4 is a nano-ceramic thermal insulation layer, and the axial fiber layer 3 is a single layer.

[0050] The first composite tube, the second composite tube, the third composite tube and the fourth composite tube were tested for tensile strength and Vicat softening temperature, and the test structure is shown in Table 1;

[0051] Table 1

[0052] Tensile strengthMpa Vicat softening temperature℃ The first composite pipe 2150 159 The second composite tube 1750 142 The third composite tube 1500 125 Fourth composite pipe 1860 129

[0053] Among them, the tensile strength is tested according to the method specified in GB / T 528-2009 standard "Test of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". As shown in Table 1, the first composite tube has the best tensile strength and high temperature resistance. The second composite tube does not have a radial fiber layer 5, and its tensile strength is poorer than that of the first composite tube, but better than the existing third composite tube. The outermost layer of the fourth composite tube is an epoxy resin layer. Although it also has good tensile strength, its performance is also worse than that of the first composite tube, and the Vicat softening temperature of the fourth composite tube is poor. At the same time, the thickness of the fourth composite tube is thicker, and the cost is higher during preparation, transportation, and use. Therefore, the composite tube structure of the utility model not only enhances the strength of the composite tube, but also reduces the thickness of the composite tube, reduces the difficulty of preparation and transportation, and effectively reduces the cost.

[0054] Example 4

[0055] On the basis of the above embodiment, the fifth composite pipe includes, from the inside to the outside, a polyethylene layer 2, an axial fiber layer 3, a thermal insulation layer 4, a radial fiber layer 5, and a polyurea protective layer 6. The fiber materials of the axial fiber layer 3 and the radial fiber layer 5 are both basalt fibers. The thermal insulation layer 4 is a nano-ceramic thermal insulation layer, and the fifth composite pipe is prepared by the preparation method of Example 2.

[0056] Among them, the thickness ratio of the polyethylene layer 2, the thermal insulation layer 4, and the polyurea protective layer 6 is 12-18:1-3:6-9. After the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 are cured into an integrated structure, the ratio of the polyethylene layer 2 to the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 that are cured into one is 12-18:7-14.

[0057] The fifth composite pipe includes, from the inside to the outside, a polyethylene layer 2, an axial fiber layer 3, a thermal insulation layer 4, a radial fiber layer 5, and a polyurea protective layer 6. The thickness ratio of the polyethylene layer 2, the thermal insulation layer 4, and the polyurea protective layer 6 of the fifth composite pipe is 15:1:7. The ratio of the polyethylene layer 2 to the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 that are solidified as one is 15:8.

[0058] The sixth composite pipe includes, from the inside to the outside, a polyethylene layer 2, an axial fiber layer 3, a thermal insulation layer 4, a radial fiber layer 5, and a polyurea protective layer 6. The thickness ratio of the polyethylene layer 2, the thermal insulation layer 4, and the polyurea protective layer 6 of the fifth composite pipe is 15:1:2. The ratio of the polyethylene layer 2 to the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 that are solidified as one is 15:2.

[0059] The seventh composite pipe includes, from the inside to the outside, a polyethylene layer 2, an axial fiber layer 3, a thermal insulation layer 4, a radial fiber layer 5, and a polyurea protective layer 6. The thickness ratio of the polyethylene layer 2, the thermal insulation layer 4, and the polyurea protective layer 6 of the fifth composite pipe is 6:1:7. The ratio of the polyethylene layer 2 to the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 that are solidified as one is 6:9.

[0060] The fifth composite tube, the sixth composite tube, and the seventh composite tube were tested for tensile strength and Vicat softening temperature, and the test structure is shown in Table 2;

[0061] Table 2

[0062] Tensile strengthMpa Vicat softening temperature℃ Fifth composite pipe 2180 158 Sixth composite pipe 1985 148 Seventh composite pipe 2015 145

[0063] As shown in Table 2, the tensile strength and high temperature resistance of the fifth composite tube are the best, the tensile strength and high temperature resistance of the sixth composite tube are worse than those of the first composite tube and the fifth composite tube, the thickness of the polyurea protective layer 6 of the sixth composite tube is outside the protection scope of the utility model, and the thickness of the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 that are solidified into one are also outside the protection scope of the utility model, and its tensile strength and high temperature resistance are better than those of the second composite tube, but the tensile strength and high temperature resistance performance are poorer than those of the sixth composite tube.

[0064] The thickness of the polyethylene layer of the seventh composite pipe is outside the protection scope of the present invention, and its tensile strength is better than that of the sixth composite pipe, but worse than that of the fifth composite pipe. The adhesion performance between the polyethylene layer 2 of the seventh composite pipe and the axial fiber layer 3, the thermal insulation layer 4, the radial fiber layer 5, and the polyurea protective layer 6 that are solidified as one is poor, and its service life is shorter than that of the sixth composite pipe.

[0065] Therefore, when the thickness of the structure is within the protection scope of the utility model, it will have better tensile strength and thermal insulation effect.

[0066] The terms "first", "second", "third", etc. used herein are only used to distinguish the corresponding components for the sake of clarity of description, and are not intended to limit any order or emphasize importance, etc. In addition, the term "connected" used herein, unless otherwise specified, may refer to direct connection or indirect connection via other components.

[0067] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A thermal insulation basalt fiber polyethylene composite pipe, It is characterized in that The composite pipe (1) comprises, from the inside to the outside, a polyethylene layer (2), an axial fiber layer (3), a thermal insulation layer (4), a radial fiber layer (5), and a polyurea protective layer (6).

2. The thermal insulation basalt fiber polyethylene composite pipe according to claim 1, It is characterized in that The fiber materials of the axial fiber layer (3) and the radial fiber layer (5) are both basalt fibers.

3. The thermal insulation basalt fiber polyethylene composite pipe according to claim 1, It is characterized in that The axial fiber layer (3) is a mesh structure formed by winding along the axial direction of the composite tube (1).

4. The thermal insulation basalt fiber polyethylene composite pipe according to claim 2, It is characterized in that The radial fiber layer (5) is a helical structure helically wound on the composite tube (1).

5. The thermal insulation basalt fiber polyethylene composite pipe according to claim 4, It is characterized in that The distance between two adjacent fibers in the radial fiber layer (5) is greater than or equal to 0.

6. The thermal insulation basalt fiber polyethylene composite pipe according to claim 5, It is characterized in that The fibers in the radial fiber layer (5) are located in the gaps formed by the axial fiber layer (3).

7. The thermal insulation basalt fiber polyethylene composite pipe according to claim 1, It is characterized in that The thermal insulation layer (4) is made of nano ceramic material.

8. The thermal insulation basalt fiber polyethylene composite pipe according to claim 1, It is characterized in that The axial fiber layer (3) is a single layer or multiple layers.

9. The thermal insulation basalt fiber polyethylene composite pipe according to claim 1, It is characterized in that The radial fiber layer (5) is a single layer or multiple layers.

10. The thermal insulation basalt fiber polyethylene composite pipe according to claim 1, It is characterized in that The helically wound fibers in the radial fiber layer (5) are single strands or multiple strands.

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