Anti-corrosion sealing strip and method for preparing anti-corrosion sealing strip

Abstract

The invention discloses an anti-corrosion sealing strip which is characterized in that the anti-corrosion sealing strip comprises a fiber rope base body and anti-corrosion sealing cement gum fully impregnated in the fiber rope base body and on the surface of the fiber rope base body; the anti-corrosion sealing strip comprises the following raw materials in parts by mass: 15-25 parts of an adhesive, 10-15 parts of a filler, 3-5 parts of a high-molecular polymer, 0.5-1.0 part of an anti-rust agent and the balance of a fiber rope, wherein the anti-corrosion sealing strip is in a semi-solidified state after being prepared and is never solidified. The invention further discloses a method for preparing the anti-corrosion sealing strip.

Description

Technical Field

[0001] This application relates to the field of anti-corrosion sealing technology, and in particular to an anti-corrosion sealing strip for metal surfaces and a method for preparing the anti-corrosion sealing strip. Background Technology

[0002] In modern industry, bolted ball joints serve as the "skeleton hub" of spatial grid structures, and expansion joints as "safety buffers" in piping systems, playing a crucial role. However, these structural components are complex in construction, especially in recessed and gap areas (such as the sleeves of bolted ball joints and the bellows of the working body of expansion joints), where moisture and corrosive media easily accumulate, leading to severe corrosion problems. Particularly in harsh environments such as marine, soil, and chemical plants, corrosion can significantly reduce the mechanical properties of structural components, threatening system safety.

[0003] Currently, the following protective methods are mainly used for such complex structural components. Anti-corrosion coatings are the most common method. However, these coatings have extremely high requirements for surface treatment (usually requiring sandblasting to remove rust), and if the treatment is not up to standard, the adhesion will be severely insufficient. Furthermore, for complex shapes such as bolted ball joints or bellows, it is difficult to ensure uniform coating thickness; too thin a layer provides insufficient protection, while too thick a layer is prone to sagging or cracking. In particular, bellows undergo displacement deformation during operation, which traditional hard coatings cannot adapt to, easily leading to cracking failure. Existing hemp fiber ropes are mainly used for binding or packaging; although they have anti-corrosion treatment, it mainly targets the rope itself and does not have a sealing function for metal surfaces. Existing rubber sealing strips are usually pre-formed solid structures that cannot fill irregular gaps and mainly rely on elastic compression for sealing, making them poorly suited for such complex joint structures.

[0004] Therefore, there is an urgent need for a corrosion-resistant material that can adapt to complex structural deformations, requires no strict surface treatment, and can provide long-lasting sealing protection. Summary of the Invention

[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide an anti-corrosion sealing strip and its preparation method. This sealing strip has excellent corrosion resistance, sealing performance, flexibility, and weather resistance, and never hardens. It can adapt to the deformation of structural components and provide long-term anti-corrosion sealing for protected areas (especially recesses and gaps).

[0006] To achieve the above objectives, this application discloses the following technical solution: an anti-corrosion sealing strip, characterized in that the anti-corrosion sealing strip comprises a fiber rope matrix and an anti-corrosion sealing putty fully impregnated inside and on the surface of the fiber rope matrix; wherein, the raw materials of the anti-corrosion sealing strip, by weight, include: 15-25 parts of adhesive, 10-15 parts of filler, 3-5 parts of polymer, 0.5-1.0 parts of rust inhibitor, and the balance being fiber rope; wherein, the anti-corrosion sealing strip is semi-solid and never hardens after preparation.

[0007] According to an optional embodiment, the adhesive is selected from one or a combination of two of petroleum grease and lubricating grease, and the full cone penetration value of the adhesive at 25°C is 22~34mm.

[0008] According to an optional embodiment, the polymer is selected from one or more combinations of liquid resin, polyisobutylene, butyl rubber, and nitrile rubber; the viscosity of the polymer is 100~300 Pa·s.

[0009] According to an optional embodiment, the filler is selected from one or more combinations of talc powder, mica powder, calcium carbonate powder, barite, bentonite, and wollastonite powder; the rust inhibitor is selected from one or more combinations of sulfonate, benzotriazole, and dodecenylsuccinic acid.

[0010] According to an optional embodiment, the rust inhibitor is calcium petroleum sulfonate, benzotriazole, or dodecenylsuccinic acid; the filler is a combination of mica powder and talc powder with a flaky structure.

[0011] According to an optional embodiment, the fiber rope is made of plant fibers, animal hair or synthetic fibers twisted together; the fiber rope matrix has a porous oil-absorbing structure before impregnation.

[0012] This application also discloses a method for preparing an anti-corrosion sealing strip, characterized by the following steps: First step: adding adhesive and polymer to a vacuum mixing tank in proportion, heating and stirring until molten; Second step: adding filler to the obtained melt and stirring evenly, then adding rust inhibitor, and obtaining a flowing anti-corrosion sealing mortar under continuous heating and stirring conditions; Third step: immersing fiber rope into the anti-corrosion sealing mortar and performing high-temperature vacuum impregnation treatment to allow the anti-corrosion sealing mortar to penetrate into the fiber rope; Fourth step: pulling out the impregnated fiber rope, cooling and solidifying it into a semi-solid state to obtain the anti-corrosion sealing strip.

[0013] According to an optional implementation, in the third step, during the high-temperature vacuum impregnation process, the temperature inside the vacuum mixing tank is maintained to maintain the low viscosity and fluidity of the anti-corrosion sealing putty, ensuring that the putty displaces the air between the fiber bundles of the fiber rope.

[0014] According to an optional implementation, the fourth step also includes an extrusion sizing step: the semi-solid fiber rope is pulled out of the vacuum mixing tank by a traction device, and during the pulling process, the excess slurry on the surface of the fiber rope is removed by an extrusion die or scraper set on the traction device to control the diameter of the finished product.

[0015] According to an optional implementation, the first and second steps are carried out continuously in the same vacuum mixing tank, and a vacuum is maintained to remove air bubbles from the material before the rust inhibitor is added.

[0016] Compared with existing technologies, this application has the following technical advantages. The non-volatile content of the anti-corrosion sealing strip of this application is tested to be as high as 99.2% (100℃, 1h), with high raw material utilization, harmless to human health and the environment, and meeting environmental protection requirements. After being immersed in 10% H2SO4, 10% HCl, 10% NaOH, and 5% NaCl solutions for 7 days (23℃±2℃), the corrosion degree of the anti-corrosion sealing strip of this application is tested to be Grade A. This proves that it has extremely strong environmental adaptability and can resist corrosion from various chemical media such as acids, alkalis, and salts. The anti-corrosion sealing strip of this application does not require sandblasting or curing; it takes effect simply by wrapping. Its non-curing characteristic gives it excellent flexibility and adhesion, allowing it to fully adapt to the deformation of components such as bellows without cracking or falling off, and preventing water, oxygen, and corrosive media from entering the recesses and gaps of structural components. The anti-corrosion sealing strip of this application adopts a high-temperature vacuum impregnation process, which allows the anti-corrosion mortar to fully penetrate into the fiber rope, making it resistant to external pressure, non-delaminating, and able to withstand wind and rain. Attached Figure Description

[0017] In the following description, embodiments of the invention will be described in more detail with reference to the accompanying drawings, wherein: Figure 1 This is a method for preparing the anti-corrosion sealing strip of this application. Detailed Implementation

[0018] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and is not limited to the embodiments shown in the drawings. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0019] In various embodiments of this application, the anti-corrosion sealing strip macroscopically appears as a continuous rope-like body with a certain diameter (e.g., 1.0 mm to 6.0 mm). Structurally, the anti-corrosion sealing strip is a composite system consisting of a fiber rope matrix and an anti-corrosion sealing putty. The fiber rope matrix, as the skeleton material, provides the longitudinal tensile strength and creep resistance of the anti-corrosion sealing strip. Unlike traditional coatings, the anti-corrosion sealing strip of this application is not a simple "outer coating + inner core" structure. Instead, through a high-temperature vacuum impregnation process, the anti-corrosion sealing putty not only coats the surface of the fiber rope but also deeply penetrates and fills the spaces between each bundle of fiber filaments within the fiber rope. This impregnation structure results in a dense, non-porous state in the cross-section of the anti-corrosion sealing strip, with the anti-corrosion sealing putty completely replacing the air in the original fiber rope matrix. In terms of physical state, the anti-corrosion sealing strip remains semi-solid at room temperature and never hardens. Its surface has pressure-sensitive adhesiveness, and it feels like adhesive putty when touched by hand. However, thanks to the support of the fiber skeleton, it can still maintain its rope-like shape and will not flow or disintegrate.

[0020] First Implementation Method In this embodiment, the raw materials of the anti-corrosion sealing strip include, by weight, 15 parts of petrolatum with a full cone penetration value (at 25°C, the same below) of 34 mm, 6 parts of talc powder, 9 parts of mica powder, 3 parts of butyl rubber with a viscosity of 300 Pa·s, 1 part of calcium petroleum sulfonate, and the balance of cotton rope with a diameter of 1.0 mm.

[0021] Figure 1 This is a method for preparing the anti-corrosion sealing strip of this application. The method includes the following steps: S1. Add petroleum grease and butyl rubber into a vacuum mixing tank, heat and stir until molten; S2. Add talc powder and mica powder and stir evenly, then add calcium petroleum sulfonate and continue heating and stirring until the material is in a flowing state; S3. Immerse the cotton rope in the material for high-temperature vacuum impregnation. After full impregnation, cool it down until it is solidified into a semi-solid state. S4. Pull, squeeze out excess material and wind it into shape.

[0022] Steps S1 and S2 can be performed continuously within the same vacuum mixing tank. Before adding the rust inhibitor, a vacuum state can be maintained to remove air bubbles from the material. In step S3, during the high-temperature vacuum impregnation process, the temperature inside the vacuum mixing tank can be maintained to preserve the low viscosity and fluidity of the anti-corrosion sealing putty, ensuring that the putty displaces the air between the fiber bundles of the fiber rope. Step S4 may also include an extrusion sizing step: the semi-solid fiber rope is pulled out of the vacuum mixing tank using a traction device. During the pulling process, an extrusion die or scraper mounted on the traction device removes excess putty from the surface of the fiber rope, controlling the finished product diameter.

[0023] Second Implementation Method In this embodiment, the raw materials of the anti-corrosion sealing strip include, by weight, 25 parts of lubricating grease with a full cone penetration value of 22 mm, 5 parts of calcium carbonate powder, 5 parts of mica powder, 5 parts of polyisobutylene (polyethylene butylene) with a viscosity of 100 Pa·s, 0.8 parts of benzotriazole, and the balance of hemp rope with a diameter of 6.0 mm.

[0024] The preparation method is the same as the first embodiment, except that the raw material components and proportions are different.

[0025] Third Implementation Method In this embodiment, the raw materials of the anti-corrosion sealing strip include, by weight, 10 parts of lubricating grease with a full cone penetration value of 27.5 mm, 10 parts of petroleum grease with a full cone penetration value of 25.3 mm, 12 parts of mica powder, 2 parts of polyisobutylene with a viscosity of 212 Pa·s, 2 parts of liquid resin with a viscosity of 286 Pa·s, 0.5 parts of calcium petroleum sulfonate, 0.3 parts of dodecenyl succinic acid, and the balance of cotton rope with a diameter of 3.0 mm.

[0026] The preparation method is the same as in the first embodiment.

[0027] Fourth Implementation Method In this embodiment, the raw materials for the anti-corrosion sealing strip, by weight, include: 20 parts of petrolatum with a full cone penetration of 30 mm, a compound filler consisting of 5 parts of 800-mesh mica powder and 8 parts of 3000-mesh talc powder, 4 parts of butyl rubber with a viscosity of 200 Pa·s, 0.8 parts of benzotriazole, and the remainder being cotton rope. The anti-corrosion sealing strip prepared in this embodiment exhibits a maze-like microstructure. Due to the use of the compound filler of 800-mesh mica powder and 3000-mesh talc powder, and the typical lamellar structure of mica powder, during extrusion shaping and putty flow, the micron-sized lamellar filler tends to stack axially or tangentially between fiber bundles, forming a dense, fish-scale-like layered structure. This microstructure constructs complex, tortuous paths within the anti-corrosion sealing putty matrix, significantly extending the path length for external moisture, oxygen, and corrosive media to penetrate the sealing strip, thereby greatly improving its anti-permeability performance without increasing the diameter of the sealing strip.

[0028] Fifth Implementation Method In this embodiment, based on the first embodiment, two parts of ultrafine zinc powder are added as a sacrificial anode and one part of magnesium oxide as an acid neutralizer. This embodiment is specifically designed for marine atmospheric environments. Even if the sealing layer is mechanically damaged, resulting in trace seawater infiltration, the ultrafine zinc powder in the formula provides cathodic protection, and the magnesium oxide neutralizes the acidification trend of accumulated seawater. In the case of intentional scratches to the sealing layer, the base metal shows no rust propagation after a long-term salt spray test, demonstrating self-healing and active protection capabilities. In the anti-corrosion sealing strip of this embodiment, ultrafine zinc powder is uniformly dispersed in the putty matrix impregnated inside and outside the fiber rope. When the sealing strip is tightly wrapped around the surface of the metal component, the zinc powder particles in the putty can establish microscopic electrical contact with the protected metal substrate. Even if the surface of the sealing strip is mechanically scratched, causing local thinning of the putty layer, the zinc powder dispersed near the wound can still be preferentially oxidized as a sacrificial anode, combined with the neutralizing effect of magnesium oxide.

[0029] To verify the performance of the anti-corrosion sealing strip prepared by the method of this application, the physicochemical properties of the anti-corrosion sealing strip were tested, and the test results are shown in the table below: Table 1. Test results of the physical and chemical properties of the anti-corrosion sealing strip.

[0030] According to the physicochemical test results in Table 1, the non-volatile content of the anti-corrosion sealing strip is as high as 99.2%, which means that the anti-corrosion sealing strip contains almost no volatile solvents. This not only ensures that the anti-corrosion sealing strip will not shrink or form pores due to solvent evaporation during use, thus maintaining long-term sealing performance, but also meets the high environmental protection standards required by modern industry.

[0031] After immersion in harsh environments of acids (sulfuric acid, hydrochloric acid), alkalis (sodium hydroxide), and salts (sodium chloride) for 7 days, the corrosion rating of the anti-corrosion sealing strip was Grade A (rust-free). This fully demonstrates that the petrolatum / lubricating grease matrix, polymer, and rust inhibitor in the anti-corrosion sealing strip of this application form a dense and stable protective layer, which can effectively block the penetration of highly corrosive media and is very suitable for complex corrosive environments such as marine and chemical industries.

[0032] As used herein, the singular forms “a,” “an,” and “the” should be interpreted as “at least one,” and therefore may include multiple entities of the same kind unless otherwise expressly stated. It should also be understood that the terms “comprising,” “including,” “including,” and / or “comprising” specify the presence of the stated features, actions, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, actions, integers, steps, operations, elements, components, and / or groups thereof.

[0033] The specific embodiments described above are merely for the purpose of more clearly illustrating the principles of this application, wherein the various components are clearly shown or described to make the principles of this application easier to understand. Without departing from the scope of this application, those skilled in the art can easily make various modifications or changes to this application, and all such modifications or changes should be included within the patent protection scope of this application.

Claims

1. A corrosion-resistant sealing strip, characterized in that, The anti-corrosion sealing strip includes a fiber rope matrix and anti-corrosion sealing putty that is fully impregnated inside and on the surface of the fiber rope matrix. The raw materials of the anti-corrosion sealing strip, by weight, include: 15-25 parts of adhesive, 10-15 parts of filler, 3-5 parts of polymer, 0.5-1.0 parts of rust inhibitor, and the remainder being fiber rope; The anti-corrosion sealing strip is semi-solid after preparation and never hardens.

2. The anti-corrosion sealing strip according to claim 1, characterized in that, The adhesive is selected from one or a combination of two of petroleum grease and lubricating grease, and the full cone penetration value of the adhesive at 25°C is 22~34mm.

3. The anti-corrosion sealing strip according to claim 1, characterized in that, The polymer is selected from one or more of liquid resin, polyisobutylene, butyl rubber, and nitrile rubber; the viscosity of the polymer is 100~300 Pa·s.

4. The anti-corrosion sealing strip according to claim 1, characterized in that, The filler is selected from one or more of talc powder, mica powder, calcium carbonate powder, barite, bentonite, and wollastonite powder; the rust inhibitor is selected from one or more of sulfonates, benzotriazole, and dodecenylsuccinic acid.

5. The anti-corrosion sealing strip according to claim 4, characterized in that, The rust inhibitor is calcium petroleum sulfonate, benzotriazole, or dodecenyl succinic acid; The filler is a combination of mica powder and talc powder with a flaky structure.

6. The anti-corrosion sealing strip according to claim 1, characterized in that, The fiber rope is made of plant fibers, animal hair or synthetic fibers twisted together; the fiber rope matrix has a porous oil-absorbing structure before impregnation.

7. A method for preparing an anti-corrosion sealing strip according to any one of claims 1-6, characterized in that, The method includes the following steps: First step: Add the adhesive and polymer to a vacuum mixing tank in proportion, and heat and stir until molten; The second step: Add filler to the obtained melt and stir evenly, then add rust inhibitor. Under continuous heating and stirring, a flowing anti-corrosion sealant is obtained. The third step: Immerse the fiber rope in the anti-corrosion sealant and perform high-temperature vacuum impregnation treatment to allow the anti-corrosion sealant to penetrate into the fiber rope. Fourth step: Pull out the impregnated fiber rope, cool it down and shape it into a semi-solid state to obtain the anti-corrosion sealing strip.

8. The method according to claim 7, characterized in that, In the third step, during the high-temperature vacuum impregnation process, the temperature inside the vacuum mixing tank is maintained to preserve the low viscosity and fluidity of the anti-corrosion sealing putty, ensuring that the putty displaces the air between the fiber bundles of the fiber rope.

9. The method according to claim 7, characterized in that, The fourth step also includes an extrusion sizing step: the semi-solid fiber rope is pulled out of the vacuum mixing tank by a traction device. During the pulling process, the excess slurry on the surface of the fiber rope is removed by an extrusion die or scraper set on the traction device to control the diameter of the finished product.

10. The method according to claim 7, characterized in that, The first and second steps are carried out continuously in the same vacuum mixing tank, and a vacuum is maintained before the rust inhibitor is added to remove air bubbles from the material.

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