High-performance seawater corrosion-resistant non-porous glass steel prepreg tape and preparation process thereof
By preparing high-performance non-porous fiberglass prepreg tape and laying it on the inner wall of steel pipe, the corrosion problem of LNG gasification pipelines for seawater discharge from power plants was solved, achieving long-term stable use and corrosion protection in seawater environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2026-03-31
- Publication Date
- 2026-07-03
AI Technical Summary
Existing pipeline corrosion protection technologies cannot effectively meet the high corrosion resistance requirements of power plant seawater gasification LNG pipelines. In particular, the fiberglass lining material of large-diameter steel pipes is prone to deformation and difficult to completely fill in the corrosive environment of seawater. Ordinary fiberglass lining materials cannot meet the corrosion protection performance requirements.
High-performance, non-porous fiberglass prepreg tape is used. Through the preparation process, the glass fiber fabric layer is immersed in high-temperature molten prepreg and extruded. Combined with release layer and freeze treatment, a fiberglass prepreg tape with flow channels is formed and laid on the inner wall of steel pipe to form a fiberglass lining.
It improves the corrosion resistance of the pipeline, ensures long-term stable use in seawater environment, avoids liquid water penetration and corrosion of the inner wall, and enhances the pipeline's waterproof and corrosion-resistant capabilities.
Smart Images
Figure CN122323404A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pipeline corrosion technology, specifically to a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion and its preparation process. Background Technology
[0002] In the seawater cooling systems of coastal thermal power plants, steel pipelines are often protected against corrosion using solvent-free liquid epoxy coatings and epoxy powder coatings. These measures only meet basic requirements; however, in highly corrosive environments, the anti-corrosion layer is prone to failure, affecting the long-term operation of the pipelines. In particular, the LNG vaporization pipelines from the seawater discharged from power plants are typically several kilometers long, made of Q235 steel, and have a single route, making them highly susceptible to seawater corrosion. Once perforation occurs, it will severely impact the operation of the LNG receiving terminal, thus placing higher demands on the effectiveness of internal anti-corrosion measures.
[0003] Currently, the main pipeline corrosion protection technologies include the following: (1) According to GB / T23258-2020 Code for Internal Corrosion Control of Steel Pipelines, epoxy resin-based GRP materials are suitable for corrosion protection requirements in warm seawater. However, the fiberglass lining fabrication method provided in the standard is only applicable to seamless oil pipes with a diameter of ≤250mm. This method is not applicable to threaded steel pipes with a diameter of DN2200. The method in the standard is to prefabricate fiberglass pipes of equal length, insert them into steel pipes, and inject resin slurry for bonding. This method is suitable for small-diameter seamless steel pipes, and thin-walled fiberglass pipes with small diameters are not easily deformed. However, for large-diameter steel pipes, thin-walled fiberglass pipes are easily deformed, and the excess height of the threaded weld seam hinders grouting, making it difficult to ensure that the gap is completely filled and thus failing to meet the quality requirements. (2) TCBMF95-2020TCCPA19-2020 Composite pipe with fiberglass reinforced concrete lining discloses a circular pipe made of fiberglass reinforced plastic (FRP) as the inner lining and reinforced concrete as the structural layer. However, it requires that the FRP be installed using a sealing ring type flexible connection. The steel pipe used in the LNG gasification pipeline of the power plant is welded, so this FRP lining installation method is not applicable.
[0004] While the methods described in the aforementioned technical standards cannot meet the corrosion resistance requirements of LNG pipelines used for LNG vaporization from seawater discharged from power plants, these standards indicate that theoretically, installing fiberglass reinforced plastic (FRP) linings on the inner wall of steel pipes can effectively improve the pipeline's corrosion resistance. However, because LNG pipelines for LNG vaporization from seawater discharged from power plants operate in a corrosive seawater environment, this places higher demands on the corrosion resistance of the FRP lining materials, which ordinary FRP lining materials cannot meet. Summary of the Invention
[0005] To address the aforementioned technical problems, this invention provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion and its preparation process.
[0006] The technical solution adopted in this invention is as follows: In a first aspect, the present invention provides a process for preparing a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, comprising the following steps: (1) Glass fiber fabric layer is prepared using glass fiber bundles; (2) The glass fiber fabric layer is immersed in high-temperature molten prepreg and extruded to obtain the prepreg tape body; (3) The prepreg tape body is combined with the release layer and then frozen to obtain the finished fiberglass prepreg tape.
[0007] Furthermore, the specific process for preparing the glass fiber fabric layer in step (1) is as follows: (11) Determine the arrangement direction of the upper glass fiber bundle and the lower glass fiber bundle; (12) Arrange several upper glass fiber bundles and lower glass fiber bundles in a determined arrangement direction, and then sew the upper glass fiber bundles and lower glass fiber bundles together.
[0008] Furthermore, in step (11), the angle between the arrangement direction of the upper glass fiber bundle and the arrangement direction of the lower glass fiber bundle is 45°~90°.
[0009] Furthermore, in step (2), the prepreg is composed of a resin matrix and a curing agent. The resin matrix is one or more of unsaturated polyester resin, epoxy resin, and phenolic resin, preferably epoxy resin, and the resin matrix content in the prepreg is not less than 40 wt%.
[0010] Furthermore, in step (3), the release layer is disposed on the upper and lower surfaces of the prepreg tape body.
[0011] Furthermore, in step (3), the release layer is a PET release film.
[0012] Furthermore, the freezing temperature in step (3) is -20~-10℃.
[0013] Secondly, the present invention provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, the prepreg tape comprising a prepreg tape body and release layers covering both sides of the prepreg tape body.
[0014] Furthermore, the glass fiber fabric layer has a flow channel formed by the gap between two adjacent glass fiber bundles.
[0015] Thirdly, the present invention also provides the application of a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion in steel pipe corrosion protection, namely, at least one layer of fiberglass prepreg tape is pasted onto the inner wall of the steel pipe to form a fiberglass lining structure.
[0016] The beneficial effects of this invention are as follows: This invention provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion and its manufacturing process. The fiberglass prepreg tape includes a prepreg tape body and a release layer covering the outside of the prepreg tape body. The prepreg tape body is obtained by impregnating a fiberglass fabric layer with a prepreg composed of resin and a curing agent under pressure. The prepreg not only fills the interior of the fiberglass fabric layer but also covers its outer surface, giving the prepreg tape body not only waterproof and corrosion-resistant properties but also a certain strength. Furthermore, this invention facilitates rapid resin filling by arranging multiple layers of fiberglass bundles within the fiberglass fabric layer in different directions and creating flow channels. Simultaneously, the gas generated during resin filling is easily discharged during extrusion, resulting in a high-performance, non-porous fiberglass prepreg tape. Applying this fiberglass prepreg tape to the inner wall of a pipeline effectively improves the pipeline's corrosion resistance, ensuring long-term stable use in seawater environments. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 A process flow diagram for preparing the high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion provided by this invention; Figure 2 A schematic diagram of the structure of the high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion provided by the present invention; Figure 3 A schematic diagram of the glass fiber fabric layer in the high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion provided by the present invention.
[0019] The diagram is labeled as follows: 1. Prepreg tape body; 2. Release layer; 3. Glass fiber fabric layer; 4. Upper glass fiber bundle; 5. Lower glass fiber bundle; 6. Flow channel. Detailed Implementation
[0020] This invention provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion and its preparation process. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0021] Example 1 Reference Figure 1This embodiment provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, and its specific preparation process is as follows: (1) Glass fiber fabric layer is prepared using glass fiber bundles; The specific process is as follows: First, determine the arrangement direction of the upper glass fiber bundle and the lower glass fiber bundle, arrange several upper glass fiber bundles and the lower glass fiber bundles perpendicularly, and then sew the upper glass fiber bundles and the lower glass fiber bundles together to obtain a glass fiber fabric layer. Moreover, the glass fiber fabric layer prepared by this method has a flow channel, which is formed by the gap between two adjacent glass fiber bundles. (2) The glass fiber fabric layer is immersed in high-temperature molten prepreg and extruded to obtain the prepreg tape body; The specific process is as follows: the prepreg (the mass ratio of epoxy resin to curing agent is 1:0.5) is melted at high temperature and conveyed to the impregnation mold. The glass fiber fabric is pulled and passed through the impregnation mold. After being fully impregnated, it is squeezed by pressure rollers to squeeze out the air and obtain the prepreg tape body. (3) The prepreg tape body is combined with the release layer and then subjected to freezing treatment to obtain the finished fiberglass prepreg tape; The specific process is as follows: cover the upper and lower surfaces of the prepreg tape body with PET release film, and then freeze-mold at -10℃ to obtain the finished fiberglass prepreg tape.
[0022] Example 2 This embodiment provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, and its specific preparation process is as follows: (1) Glass fiber fabric layer is prepared using glass fiber bundles; The specific process is as follows: First, determine the arrangement direction of the upper glass fiber bundle and the lower glass fiber bundle. Arrange several upper glass fiber bundles and lower glass fiber bundles with an angle of 80° between their arrangement directions. Then, sew the upper glass fiber bundles and lower glass fiber bundles together to obtain a glass fiber fabric layer. Moreover, the glass fiber fabric layer prepared by this method has a flow channel, which is formed by the gap between two adjacent glass fiber bundles. (2) The glass fiber fabric layer is immersed in high-temperature molten prepreg and extruded to obtain the prepreg tape body; The specific process is as follows: the prepreg (the mass ratio of epoxy resin to curing agent is 1:0.5) is melted at high temperature and conveyed to the impregnation mold. The glass fiber fabric is pulled and passed through the impregnation mold. After being fully impregnated, it is squeezed by pressure rollers to squeeze out the air and obtain the prepreg tape body. (3) The prepreg tape body is combined with the release layer and then subjected to freezing treatment to obtain the finished fiberglass prepreg tape; The specific process is as follows: cover the upper and lower surfaces of the prepreg tape body with PET release film, and then freeze-mold at -20℃ to obtain the finished fiberglass prepreg tape.
[0023] Example 3 This embodiment provides a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, and its specific preparation process is as follows: (1) Glass fiber fabric layer is prepared using glass fiber bundles; The specific process is as follows: First, determine the arrangement direction of the upper glass fiber bundle and the lower glass fiber bundle. Arrange several upper glass fiber bundles and lower glass fiber bundles at an angle of 45° between their arrangement directions. Then, sew the upper glass fiber bundles and lower glass fiber bundles together to obtain a glass fiber fabric layer. Moreover, the glass fiber fabric layer prepared by this method has a flow channel, which is formed by the gap between two adjacent glass fiber bundles. (2) The glass fiber fabric layer is immersed in high-temperature molten prepreg and extruded to obtain the prepreg tape body; The specific process is as follows: the prepreg (the mass ratio of epoxy resin to curing agent is 1:0.4) is melted at high temperature and conveyed to the impregnation mold. The glass fiber fabric is pulled and passed through the impregnation mold. After being fully impregnated, it is squeezed by pressure rollers to squeeze out the air and obtain the prepreg tape body. (3) The prepreg tape body is combined with the release layer and then subjected to freezing treatment to obtain the finished fiberglass prepreg tape; The specific process is as follows: cover the upper and lower surfaces of the prepreg tape body with PET release film, and then freeze-mold at -20℃ to obtain the finished fiberglass prepreg tape.
[0024] The structure of the fiberglass prepreg prepared by the process in Examples 1-3 above is as follows: Figure 2 As shown, the fiberglass prepreg tape includes a prepreg tape body 1 and a release layer 2 covering the outside of the prepreg tape body. The prepreg tape body 1 is obtained by impregnating a fiberglass fabric layer 3 with a prepreg composed of resin and curing agent and then pressing it. The prepreg not only fills the interior of the fiberglass fabric layer but also covers the outer surface of the fiberglass fabric layer, forming a reinforced fiber composite material. The aforementioned prepreg tape body not only has waterproof and corrosion-resistant properties but also has a certain strength.
[0025] Additionally, refer to Figure 3The aforementioned glass fiber fabric layer 3 is woven from several upper glass fiber bundles 4 and lower glass fiber bundles 5, with a certain angle between the arrangement directions of the upper glass fiber bundles 4 and the lower glass fiber bundles 5. During the weaving process of the aforementioned glass fiber fabric layer 3, there is a certain gap between adjacent glass fiber bundles in each glass fiber bundle layer. This gap forms a flow channel 6, which enables rapid filling of the prepreg. In addition, after the prepreg is filled, the plane of the flow channel area is still slightly lower than other areas, that is, a certain flow channel structure is still retained after the prepreg is filled. When the prepreg tape is pasted onto the inner wall of the steel pipe, the flow channels will connect to form a ring-shaped flow structure. In this way, even if there is liquid water inside the pipe, the liquid water can only move circumferentially around the pipe along the ring-shaped flow structure, minimizing the possibility of liquid water penetrating the prepreg tape and reaching the inner wall of the steel pipe, further reducing the possibility of corrosion of the inner wall of the steel pipe.
[0026] Furthermore, in embodiments 1-3 above, by arranging the multi-layered glass fiber bundles within the glass fiber fabric layer in a perpendicular or angled manner and creating flow channels, gas during the prepreg filling process is facilitated to escape during extrusion, thereby obtaining a high-performance, non-porous fiberglass prepreg tape. Applying this fiberglass prepreg tape to the inner wall of a pipe effectively improves the pipe's corrosion resistance, thus ensuring long-term stable use.
[0027] It should be noted that any parts not mentioned in this invention can be achieved by using or referencing existing technologies.
[0028] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. A preparation process for a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, characterized in that, Including the following steps: (1) Glass fiber fabric layer is prepared using glass fiber bundles; (2) The glass fiber fabric layer is immersed in high-temperature molten prepreg and extruded to obtain the prepreg tape body; (3) The prepreg tape body is combined with the release layer and then frozen to obtain the finished fiberglass prepreg tape.
2. The preparation process of a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 1, characterized in that, The specific process for preparing the glass fiber fabric layer in step (1) is as follows: (11) Determine the arrangement direction of the upper glass fiber bundle and the lower glass fiber bundle; (12) Arrange several upper glass fiber bundles and lower glass fiber bundles in a determined arrangement direction, and then sew the upper glass fiber bundles and lower glass fiber bundles together.
3. The preparation process of a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 1, characterized in that, In step (11), the angle between the arrangement direction of the upper glass fiber bundle and the arrangement direction of the lower glass fiber bundle is 45°~90°.
4. The high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 1, characterized in that, In step (2), the prepreg is made by compounding a resin matrix and a curing agent. The resin matrix is one or more of unsaturated polyester resin, epoxy resin, and phenolic resin, and the resin matrix content in the prepreg is not less than 40wt%.
5. The preparation process of a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 1, characterized in that, In step (3), the release layer is applied to the upper and lower surfaces of the prepreg tape body.
6. The preparation process of a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 1, characterized in that, In step (3), the release layer is a PET release film.
7. The preparation process of a high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 1, characterized in that, The freezing temperature in step (3) is -20~-10℃.
8. A high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion, prepared using the process described in any one of claims 1-7.
9. The high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 8, characterized in that, The prepreg tape includes a prepreg tape body and release layers covering both sides of the prepreg tape body.
10. The high-performance, non-porous fiberglass prepreg tape resistant to seawater corrosion according to claim 8, characterized in that, The glass fiber fabric layer has a flow channel, which is formed by the gap between two adjacent glass fiber bundles.