A chlorinated rubber-based flexible permeation-resistant anticorrosive coating and a method for preparing the same
A flexible, impermeable, and anti-corrosion coating based on chlorinated rubber was prepared by combining chlorinated rubber particles with epoxy resin. This method solves the problems of low repair efficiency and inconsistent construction of traditional coatings, and achieves efficient and simple coating repair with excellent anti-corrosion performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN THERMAL POWER RES INST CO LTD
- Filing Date
- 2026-05-26
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional coating repair methods are inefficient, their application results are greatly affected by environmental factors, it is difficult to achieve uniform standards, and they cannot effectively prevent corrosion and damage to coatings in marine environments.
A flexible, impermeable, and anti-corrosion coating based on chlorinated rubber was prepared by combining chlorinated rubber particles with epoxy resin and then using a stirring, settling, and rolling process to form a cross-linked network that blocks the penetration of corrosive media.
A method for rapidly repairing damaged coatings in marine environments is provided, which has excellent impermeability and flexibility, can adapt to complex curved surfaces and structural deformations, and is easy to apply with high coating performance consistency.
Smart Images
Figure CN122255831A_ABST
Abstract
Description
Technical Field
[0001] This disclosure belongs to the field of coating technology, specifically relating to a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating and its preparation method. Background Technology
[0002] In environments subject to frequent vibrations such as ship collisions, wave impacts, and strong winds, pile foundations inevitably experience partial coating failure and peeling, exposing the substrate to the environment and accelerating pile foundation corrosion.
[0003] Traditional repair methods cannot solve the corrosion problem in the repair area in one go. They usually require one trip to sea for sanding, one trip for applying primer, and one trip for applying topcoat. This repair method is not only inefficient, but the construction effect is also greatly affected by on-site factors such as local climate characteristics, the interval between sea trips, and the skill level of the workers, making it difficult to achieve a uniform standard of repair results. Summary of the Invention
[0004] This disclosure aims to at least solve one of the technical problems existing in the prior art, and to provide a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating and its preparation method.
[0005] One aspect of this disclosure provides a method for preparing a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating, the method comprising: Chlorinated rubber granules are added to tetrachloroethylene and stirred thoroughly. After being drained, chlorinated rubber granules are obtained. The chlorinated rubber particles are added to the epoxy resin stock solution and stirred thoroughly until the chlorinated rubber particles can be stably suspended in the stock solution to form a mixture. Add the curing agent to the mixture and stir thoroughly to obtain an epoxy base solution containing chlorinated rubber particles; The epoxy raw liquid containing chlorinated rubber particles is placed in a mold and left to stand to obtain a film. The film is then subjected to multiple rolling processes on a roller press to obtain a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0006] Optionally, the chlorinated rubber particles have a particle size of 100-200 μm.
[0007] Optionally, the chlorinated rubber particles are added to tetrachloroethylene and stirred thoroughly for 20-40 minutes.
[0008] Optionally, the content of the chlorinated rubber particles is 25-50% of the mass of the solid content of the epoxy resin stock solution.
[0009] Optionally, the curing agent content is 4-10% of the solid content of the epoxy resin stock solution by mass.
[0010] Optionally, the curing agent is added to the mixture and stirred thoroughly for at least 30 minutes.
[0011] Optionally, the epoxy raw material containing chlorinated rubber particles is placed in the mold and left to stand for 6-24 hours.
[0012] Optionally, when the film is rolled multiple times on a roller press, the thickness of the film after the first roll is 2-7 mm, and the thickness of each roll is not less than 2 / 3 of the original film thickness.
[0013] Optionally, the thickness of the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is 1-1.5 mm.
[0014] In another aspect of this disclosure, a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is provided, wherein the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is prepared by the preparation method described above.
[0015] This disclosure discloses a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating and its preparation method. The preparation method includes: adding chlorinated rubber particles to tetrachloroethylene and stirring thoroughly, followed by draining to obtain chlorinated rubber particles; adding the chlorinated rubber particles to an epoxy resin stock solution and stirring thoroughly until the chlorinated rubber particles are stably suspended in the stock solution to form a mixture; adding a curing agent to the mixture and stirring thoroughly to obtain an epoxy stock solution containing chlorinated rubber particles; placing the epoxy stock solution containing chlorinated rubber particles in a mold and allowing it to stand to obtain a film; and repeatedly rolling the film on a roller press to obtain a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating. This flexible coating provides isolation performance against corrosive media at sea comparable to that of traditional coatings at the time of manufacture, while also possessing certain tensile strength, flexural strength, and corrosion resistance. Attached Figure Description
[0016] Figure 1 This is a flowchart illustrating the preparation method of a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating according to a specific embodiment of this disclosure.
[0017] Figure 2 This is a physical image of the coating of Embodiment 1 of this disclosure.
[0018] Figure 3 This is a physical image of the coating of Embodiment 2 of this disclosure.
[0019] Figure 4 This is a photograph of a 5mm thick coating in Embodiment 2 of this disclosure.
[0020] Figure 5 This is a physical image of a 3mm thick coating in Embodiment 2 of this disclosure.
[0021] Figure 6 This is a physical image of a 2mm thick coating in Embodiment 2 of this disclosure.
[0022] Figure 7 This is a photograph of a coating with a thickness of 1.5 mm in Embodiment 2 of this disclosure.
[0023] Figure 8 This is a physical image of the coating of Embodiment 3 of this disclosure.
[0024] Figure 9 This is a physical image of the coating of Embodiment 4 of this disclosure.
[0025] Figure 10 This is a physical image of the coating of Embodiment 5 of this disclosure.
[0026] Figure 11 This is a physical image of the coating of Embodiment 6 of this disclosure.
[0027] Figure 12 The diagrams are of the process of water absorption rate test of the adhesive film coating in Examples 1-4 of this disclosure; wherein, (a) is of the process of water absorption rate test of the adhesive film in Example 1, (b) is of the process of water absorption rate test of the adhesive film in Example 2, (c) is of the process of water absorption rate test of the adhesive film in Example 3, and (d) is of the process of water absorption rate test of the adhesive film in Example 4.
[0028] Figure 13 The diagram shows the bending test process of the adhesive film coating in Example 1 of this disclosure; wherein, (a) is the shape of the adhesive film before bending in Example 1, (b) is the shape of the adhesive film after bending in Example 1, and (c) is the shape of the adhesive film after bending deformation in Example 1.
[0029] Figure 14 The images shown are SEM images of the cross-sections of the adhesive film coatings of Examples 1-6 of this disclosure; wherein, (a) is the SEM image of Example 1, (b) is the SEM image of Example 2, (c) is the SEM image of Example 3, (d) is the SEM image of Example 4, (e) is the SEM image of Example 5, and (f) is the SEM image of Example 6.
[0030] Figure 15 These are hyper-depth-of-field images of the cross-section of the film coating of Examples 1-6 of this disclosure; wherein, (a) is the hyper-depth-of-field image of Example 1, (b) is the hyper-depth-of-field image of Example 2, (c) is the hyper-depth-of-field image of Example 3, (d) is the hyper-depth-of-field image of Example 4, (e) is the hyper-depth-of-field image of Example 5, and (f) is the hyper-depth-of-field image of Example 6. Detailed Implementation
[0031] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this disclosure and represent a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the protection scope of this disclosure.
[0032] As shown in Figure 1, one aspect of this disclosure provides a method S100 for preparing a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating, specifically including the following steps S110~S140: S110. Add chlorinated rubber granules to tetrachloroethylene and stir thoroughly. Use a filter screen to collect and drain the chlorinated rubber granules to obtain chlorinated rubber granules.
[0033] In step S110, the particle size of the chlorinated rubber particles is 100-200 μm.
[0034] In step S110, the time for fully stirring the chlorinated rubber particles added to tetrachloroethylene is 20-40 min, for example, preferably 30 min.
[0035] S120. Add the drained chlorinated rubber granules to the epoxy resin stock solution and stir thoroughly until the chlorinated rubber granules can be stably suspended in the stock solution, until the color of the curing agent and the color of the epoxy stock solution are evenly mixed to form a mixture.
[0036] In step S120, the mass ratio of chlorinated rubber particles to epoxy resin solid content is 25-50%.
[0037] In step S120, the mass concentration of the epoxy resin stock solution is 20-50%.
[0038] S130. Add the curing agent to the mixture and stir thoroughly to obtain an epoxy base solution containing chlorinated rubber particles.
[0039] In step S130, the content of the curing agent is 4-6% of the mass of the epoxy resin stock solution, for example, preferably 5%.
[0040] In step S130, the mass fraction of the curing agent is 8-12%, for example, preferably 10%.
[0041] It should be understood that, generally speaking, epoxy-based coatings require the use of a curing agent to cross-link the epoxy resin monomers, forming a corrosion-resistant coating with good hydrophobic properties. Therefore, the epoxy resin used in this embodiment is the commercially available E41 type resin, and the curing agent is a linear amine-based curing agent prepared in the laboratory specifically for E41 type resin. Linear curing agents can only achieve good flexibility of the cross-linked film within a certain timeframe when combined with fillers possessing a certain degree of elasticity (such as rubber fillers, chlorinated rubber, and chlorosulfonated rubber).
[0042] In step S130, the curing agent is added to the mixture and stirred thoroughly for at least 30 minutes.
[0043] S140. The epoxy raw liquid containing chlorinated rubber particles is placed in a mold and left to stand. When the surface of the film is no longer sticky, it is taken out to obtain the film. The film is then rolled multiple times on a roller press to obtain a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0044] In step S140, the epoxy raw material containing chlorinated rubber particles is placed in a mold and left to stand for 6-24 hours.
[0045] It should be noted that the mold is preferably 3-10 mm thick.
[0046] In step S140, when the adhesive film is rolled multiple times on the roller press, the thickness of the adhesive film after the first roll is 2-7mm, and the thickness of each roll is not less than 2 / 3 of the original adhesive film thickness.
[0047] In step S140, the thickness of the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is 1-1.5 mm.
[0048] This invention addresses the problems of traditional repair methods, such as frequent sea trips and significant weather-dependent intervals, while also resolving the inconsistencies in coating corrosion resistance caused by variations in the construction environment (temperature, humidity, salinity, etc.) and worker skill levels. Firstly, this disclosure utilizes a composite of chlorinated rubber particles and epoxy resin, followed by roll forming, to obtain a flexible and easily folded film material, enabling it to adapt to complex curved surfaces and structural deformations (such as the micro-movements and thermal expansion / contraction of wind turbine towers). Secondly, chlorinated rubber itself possesses excellent water resistance, salt spray resistance, and impermeability. When uniformly dispersed as functional particles within an epoxy matrix and forming a cross-linked network with a curing agent, it effectively blocks the penetration of corrosive media (water, chloride ions), resulting in excellent impermeability.
[0049] It should also be noted that this chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is the anti-permeability layer in the composite coating. That is, as the middle layer of the composite coating, it is used in conjunction with the underlying adhesive layer and surface functional layer. This is equivalent to using this flexible anti-permeability and anti-corrosion coating with an adhesive layer to prepare a roll material similar to double-sided tape. Only simple surface treatment of the area to be repaired is required, and the flexible anti-permeability and anti-corrosion coating can be applied to the area to be repaired to achieve rapid repair of the anti-corrosion coating of offshore wind power equipment without the need for on-site mixing, brushing, curing and other processes.
[0050] In another aspect of this disclosure, a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is proposed. This chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is prepared by the preparation method described above. For the specific process, please refer to the description above, which will not be repeated here.
[0051] The chlorinated rubber-based flexible anti-permeability and anti-corrosion coating disclosed herein uses chlorinated rubber fillers that not only have good anti-permeability properties against conventional corrosive media (water and oxygen), but also have excellent anti-permeability properties against chloride ions, which are prone to causing coating damage in marine environments. This prevents chloride ions from penetrating and further accelerating the corrosion of the pile foundation. As a result, this chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is mainly used for the rapid repair and long-term anti-corrosion of damaged coatings in marine environments, and has anti-permeability properties comparable to traditional coatings.
[0052] The preparation method of chlorinated rubber-based flexible anti-permeability and anti-corrosion coating will be further explained below with reference to specific embodiments: Example 1 100 g of chlorinated rubber with a particle size of 100 μm was thoroughly stirred in tetrachloroethylene for 30 min and then drained. This was then added to 2000 g of epoxy resin stock solution with a mass concentration of 20% (the mass ratio of chlorinated rubber to epoxy stock solution solids was 25%), and stirred thoroughly until the chlorinated rubber particles were stably suspended in the stock solution. 20 g of curing agent (amine-based curing agent) with a mass fraction of 10% was added to the suspension and stirred thoroughly for 30 min until the color of the curing agent and epoxy stock solution were uniformly mixed. This mixture was then poured into a 3 mm thick mold and allowed to stand for 6 h. When the film surface was no longer sticky to the touch, it was removed and first rolled into a 2 mm film on a roller press, then rolled into a 1.5 mm film, and finally rolled into a 1.0 mm film. This film is the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0053] As shown in Table 1, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 1 had a water absorption mass of 0.4893g before immersion and a water absorption mass of 0.4995g after immersion, with a water absorption rate of 2.08%.
[0054] like Figure 2As shown in the figure, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 1 is a physical image. The coating is a uniform solid film with no obvious bubbles, cracks or impurity spots. The surface is flat and smooth without any unevenness or defects.
[0055] like Figure 12 As shown in (a) in the experiment, the film did not dissolve, delaminate, or break during the experiment and always maintained its intact shape, indicating that the coating has good immersion resistance in the corrosive medium and there is no structural disintegration caused by medium penetration. This shows the coating's ability to isolate the corrosive medium.
[0056] like Figure 13 As shown, the film can be bent at a large angle during the test (judging from the shape in the figure, the bending angle is ≥90°), without any breakage, cracks or delamination caused by bending. This proves that the coating has good flexibility. After the bending test, the film has no permanent deformation and can recover to its original sheet shape without wrinkles or curling residue, indicating that the film coating has a certain elastic recovery ability.
[0057] like Figure 14 As shown in (a), according to the SEM image of the film, the particles are embedded in the epoxy resin matrix in an independent form, without any dense areas formed by local particle accumulation.
[0058] like Figure 15 As shown in (a), according to the cross-sectional SEM image of the film, there is no significant change in particle distribution and matrix structure from the edge to the center of the cross section.
[0059] Example 2 100 g of chlorinated rubber with a particle size of 200 μm was thoroughly stirred in tetrachloroethylene for 30 min and then drained. This was then added to 2000 g of epoxy resin stock solution with a mass concentration of 20% (the mass ratio of chlorinated rubber to epoxy stock solution solids was 25%), and stirred thoroughly until the chlorinated rubber particles were stably suspended in the stock solution. 20 g of curing agent (amine-based curing agent) with a mass fraction of 10% was added to the suspension and stirred thoroughly for 30 min until the color of the curing agent and epoxy stock solution were uniformly mixed. The mixture was then poured into a 10 mm thick mold and allowed to stand for 24 h. When the film surface was no longer sticky to the touch, it was removed and first rolled into a 7 mm film using a roller press. Then, films of 5 mm, 3 mm, 2 mm, and 1.5 mm were formed. This film is the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0060] As shown in Table 1, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 2 had a water absorption mass of 0.7828g before immersion and a water absorption mass of 0.7964g after immersion, with a water absorption rate of 1.70%.
[0061] like Figures 3 to 7As shown in the figure, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 2 has a uniform solid film shape, a smooth surface without obvious impurities, bubbles or cracks, and maintains its integrity as the film thickness gradually decreases, without cracking, tearing or local damage caused by rolling.
[0062] like Figure 12 As shown in (b) in the experiment, the film did not dissolve, delaminate, or break during the experiment and always maintained its intact shape, indicating that the coating has good immersion resistance in the corrosive medium and there is no structural disintegration caused by medium penetration. This shows the coating's ability to isolate the corrosive medium.
[0063] like Figure 14 As shown in (b), according to the SEM image of the film, the initial thickness of the film is greater because the mold thickness is 10mm. However, after multiple rolling processes, there is still no loose area inside in the SEM image.
[0064] like Figure 15 As shown in (b), according to the cross-sectional SEM image of the film, due to multiple rolling (from 7mm to 1.5mm), there is no delamination or stress cracks caused by rolling, which verifies the uniformity and safety of the rolling process.
[0065] Example 3 100 g of chlorinated rubber with a particle size of 150 μm was thoroughly stirred in tetrachloroethylene for 30 min and then drained. This was then added to 1000 g of 40% epoxy resin stock solution (the mass ratio of chlorinated rubber to epoxy stock solution solids was 25%), and stirred thoroughly until the chlorinated rubber particles were stably suspended in the stock solution. 20 g of 10% curing agent (amine-based curing agent) was added to the suspension and stirred thoroughly for 30 min until the color of the curing agent and epoxy stock solution were uniformly mixed. This mixture was then poured into a 3 mm thick mold and allowed to stand for 6 h. When the film surface was no longer sticky to the touch, it was removed and first rolled into a 2 mm film on a roller press, then rolled into a 1.5 mm film, and finally rolled into a 1.0 mm film. This film is the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0066] As shown in Table 1, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 3 had a water absorption mass of 0.9753g before immersion and a water absorption of 0.9918g after immersion, with a water absorption rate of 1.69%.
[0067] like Figure 8 As shown in the figure, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 3 is a physical image. The film is uniform and solid, with no bubbles or impurities on the surface and no burrs on the edges.
[0068] like Figure 12As shown in (c), the film did not dissolve, delaminate, or break during the test and maintained its intact shape throughout, indicating that the coating has good immersion resistance in corrosive media and no structural disintegration caused by media penetration. This demonstrates the coating's ability to isolate corrosive media.
[0069] like Figure 14 As shown in (c), the SEM image of the film shows that there are no gaps in the transition area between the particles and the substrate.
[0070] like Figure 15 As shown in (c), according to the cross-sectional SEM image of the film, even when the edge area is magnified, there is still no interface peeling or tiny voids.
[0071] Example 4 100 g of chlorinated rubber with a particle size of 150 μm was thoroughly stirred in tetrachloroethylene for 30 min and then drained. This was then added to 800 g of 50% epoxy resin stock solution (the mass ratio of chlorinated rubber to epoxy stock solution solids was 25%), and stirred thoroughly until the chlorinated rubber particles were stably suspended in the stock solution. 20 g of 10% curing agent (amine-based curing agent) was added to the suspension and stirred thoroughly for 30 min until the color of the curing agent and epoxy stock solution were uniformly mixed. This mixture was then poured into a 3 mm thick mold and allowed to stand for 6 h. When the film surface was no longer sticky to the touch, it was removed and first rolled into a 2 mm film on a roller press, then rolled into a 1.5 mm film, and finally rolled into a 1.0 mm film. This film is the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0072] As shown in Table 1, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 4 had a water absorption mass of 0.9808 g before immersion and a water absorption mass of 0.9991 g after immersion, with a water absorption rate of 1.83%.
[0073] like Figure 9 As shown in the figure, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 4 has a smooth and flat surface, and will not crack or shrink unevenly after curing due to excessive resin concentration.
[0074] like Figure 12 As shown in (d) in the experiment, the film did not dissolve, delaminate, or break during the experiment and always maintained its intact shape, indicating that the coating has good immersion resistance in corrosive media and no structural disintegration caused by media penetration. This shows the coating's ability to isolate corrosive media.
[0075] like Figure 14As shown in (d), according to the SEM image of the film, even when the epoxy resin concentration is 50% (the highest concentration), there are no residual bubbles in the cross section due to the excessive viscosity of the resin. This indicates that the "static degassing + roller pressing densification" process effectively improves the micro-density of the coating. Of course, this is also the key reason for the low water absorption rate of the coating.
[0076] like Figure 15 As shown in (d), according to the cross-sectional SEM image of the film, there is still no interfacial peeling or micropores.
[0077] Example 5 100 g of chlorinated rubber with a particle size of 150 μm was thoroughly stirred in tetrachloroethylene for 30 min and then drained. This was then added to 1250 g of 20% epoxy resin stock solution (the mass ratio of chlorinated rubber to epoxy stock solution solids was 40%), and stirred thoroughly until the chlorinated rubber particles were stably suspended in the stock solution. 20 g of 10% curing agent (amine-based curing agent) was added to the suspension and stirred thoroughly for 30 min until the color of the curing agent and epoxy stock solution were uniformly mixed. This mixture was then poured into a 3 mm thick mold and allowed to stand for 6 h. When the film surface was no longer sticky to the touch, it was removed and first rolled into a 2 mm film on a roller press, then rolled into a 1.5 mm film, and finally rolled into a 1.0 mm film. This film is the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0078] As shown in Table 1, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 5 had a water absorption mass of 0.7552 g before immersion and a water absorption of 0.7679 g after immersion, with a water absorption rate of 1.68%.
[0079] like Figure 10 As shown in the figure, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 5 has a uniform film surface without any particle agglomeration marks. There is no surface roughness or local protrusion caused by the increase of the chlorinated rubber content to 40%, indicating that the process of "tetrachloroethylene pretreatment + thorough stirring until stable suspension" can effectively solve the dispersion problem of high proportion particles. The chlorinated rubber has good compatibility with the epoxy resin matrix and no phase separation occurs.
[0080] like Figure 14 As shown in (e), the SEM image of the film shows no signs of peeling at the interface, indicating that the curing agent not only achieves cross-linking and curing of the epoxy resin, but also promotes the interfacial bonding between the particles and the matrix, thus preventing the interfacial voids from becoming channels for the penetration of corrosive media.
[0081] like Figure 15As shown in (e), the cross-sectional SEM image of the film shows that even samples with a high chlorinated rubber content do not exhibit localized structural looseness due to particle accumulation, further confirming the overall compactness of the coating and its excellent anti-permeability properties.
[0082] Example 6 100 g of chlorinated rubber with a particle size of 150 μm was thoroughly stirred in tetrachloroethylene for 30 min and then drained. This was then added to 1000 g of 20% epoxy resin stock solution (the mass ratio of chlorinated rubber to epoxy stock solution solids was 50%), and stirred thoroughly until the chlorinated rubber particles were stably suspended in the stock solution. 20 g of 10% curing agent (amine-based curing agent) was added to the suspension and stirred thoroughly for 30 min until the color of the curing agent and epoxy stock solution were uniformly mixed. This mixture was then poured into a 3 mm thick mold and allowed to stand for 6 h. When the film surface was no longer sticky to the touch, it was removed and first rolled into a 2 mm film on a roller press, then rolled into a 1.5 mm film, and finally rolled into a 1.0 mm film. This film is the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
[0083] As shown in Table 1, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 6 had a water absorption mass of 0.7816 g before immersion and a water absorption of 0.7944 g after immersion, with a water absorption rate of 1.63%.
[0084] like Figure 11 As shown in the figure, the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating prepared in Example 6 has a smooth surface without particle agglomeration, surface cracks or voids.
[0085] like Figure 14 As shown in (f), according to the SEM image of the film, although chlorinated rubber accounts for 50%, the particles are still evenly distributed.
[0086] like Figure 15 As shown in (f), according to the cross-sectional SEM image of the film, the sample with a high chlorinated rubber content will not have a loose local structure due to particle accumulation.
[0087] In summary, all embodiments exhibited low water absorption rates (1.61%-2.0%), indicating that the coating possesses excellent anti-permeability properties. This means that the coating effectively isolates corrosive media such as seawater and moisture. The thickness of the film after roll pressing reached 1.0-1.5 mm, and bending tests demonstrated its good flexibility. SEM and ultra-depth-of-field images showed that the chlorinated rubber particles were uniformly dispersed without agglomeration, pores, or cracks, further ensuring anti-permeability.
[0088] Table 1 Water Absorption Test Data
[0089] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.
Claims
1. A process for the preparation of a chlorinated rubber based flexible permeation resistant anticorrosive coating characterized in that, The preparation method includes: Chlorinated rubber granules are added to tetrachloroethylene and stirred thoroughly. After being drained, chlorinated rubber granules are obtained. The chlorinated rubber particles are added to the epoxy resin stock solution and stirred thoroughly until the chlorinated rubber particles can be stably suspended in the stock solution to form a mixture. Add the curing agent to the mixture and stir thoroughly to obtain an epoxy base solution containing chlorinated rubber particles; The epoxy raw liquid containing chlorinated rubber particles is placed in a mold and left to stand to obtain a film. The film is then subjected to multiple rolling processes on a roller press to obtain a chlorinated rubber-based flexible anti-permeability and anti-corrosion coating.
2. The preparation method according to claim 1, characterized in that, The chlorinated rubber particles have a particle size of 100-200 μm.
3. The preparation method according to claim 1, characterized in that, The chlorinated rubber granules are added to tetrachloroethylene and stirred thoroughly for 20-40 minutes.
4. The preparation method according to claim 1, characterized in that, The content of the chlorinated rubber particles is 25-50% of the solid content of the epoxy resin stock solution by mass.
5. The preparation method according to claim 1, characterized in that, The curing agent content is 4-8% of the solid content of the epoxy resin stock solution by mass.
6. The preparation method according to claim 1, characterized in that, The curing agent is added to the mixture and stirred thoroughly for at least 30 minutes.
7. The preparation method according to claim 1, characterized in that, The epoxy raw material containing chlorinated rubber particles is placed in the mold and left to stand for 6-24 hours.
8. The preparation method according to claim 1, characterized in that, When the adhesive film is rolled multiple times on a roller press, the thickness of the adhesive film after the first roll is 2-7 mm, and the thickness of each roll is not less than 2 / 3 of the original thickness of the adhesive film.
9. The preparation method according to claim 1, characterized in that, The thickness of the chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is 1-1.5 mm.
10. A chlorinated rubber-based flexible anti-permeability and anti-corrosion coating, characterized in that, The chlorinated rubber-based flexible anti-permeability and anti-corrosion coating is prepared by the preparation method described in any one of claims 1 to 9.