Composite concrete anti-permeability internal curing agent as well as preparation and application thereof
By preparing a composite concrete anti-seepage internal curing agent, and using materials such as paraffin emulsion and polyvinyl alcohol to form an isolation-water retention layer on the concrete surface, the problem of leakage in underground pipe corridors was solved, the anti-seepage performance was improved, and the cost and construction complexity were reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LINFEN XINGUANG BUILDING MATERIALS CO LTD
- Filing Date
- 2026-02-02
- Publication Date
- 2026-05-19
AI Technical Summary
In existing technologies, secondary disasters and safety hazards caused by leakage in underground utility tunnels, especially in old urban areas and densely populated areas, are difficult to effectively improve the seepage prevention performance due to the complexity and high cost of existing anti-seepage concrete curing agents.
A composite concrete anti-seepage internal curing agent is used, which is composed of paraffin emulsion, cellulose xanthate grafted acrylate, polyvinyl alcohol and polyacrylamide. It is prepared through a specific process to form an isolation-water retention composite functional layer. After being sprayed on the concrete surface, it is cured under natural conditions for 24 hours.
It significantly improves the impermeability of concrete, reduces material costs and mix design complexity, enhances production and construction convenience, and ensures the overall impermeability and safety of concrete.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of concrete curing agent technology, and more specifically, to a composite concrete anti-seepage internal curing agent and its preparation and application. Background Technology
[0002] Leakage in underground utility tunnels has become a major hidden danger in urban safety and environmental protection. Leaks within the tunnels not only cause secondary disasters such as soil erosion and ground subsidence, but also contaminate drinking water or transported media, threatening public health. Especially in mature areas such as old urban areas, densely populated areas, and transportation hubs, the complex underground pipe networks and aging facilities mean that leaks can further induce a chain of risks such as methane accumulation and gas leakage, and even trigger serious safety accidents such as explosions and fires, causing huge casualties and property losses. Therefore, improving the seepage prevention capabilities of the utility tunnel structure itself is crucial. Currently, impermeable concrete is commonly used as the main seepage prevention method in engineering projects. Its impermeability is mainly achieved through optimizing aggregate proportions, adding admixtures, and strengthening curing. Among these, concrete curing agents, as a surface coating material, form a protective film on the concrete surface through polymer components, effectively inhibiting premature moisture evaporation, thereby ensuring the compactness, strength, and long-term impermeability durability of the concrete structure, becoming one of the important technical measures to improve the seepage prevention performance of underground utility tunnels. Summary of the Invention
[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one aspect of the present invention is to provide a composite concrete anti-seepage internal curing agent, wherein the raw materials of the curing agent include 10-30 parts by weight of paraffin emulsion, 10-40 parts of cellulose xanthate grafted acrylate, 10-40 parts of polyvinyl alcohol, 1-5 parts of polyacrylamide and 15-30 parts of water.
[0004] Another objective of this invention is to provide a method for preparing a composite concrete anti-seepage internal curing agent, the specific steps of which are as follows: S1. Heat the water, then add polyvinyl alcohol to the water and mix, maintain the water temperature, ultrasonically disperse and mechanically stir until uniform to obtain the first emulsion; S2. Paraffin emulsion and cellulose xanthate grafted acrylate are slowly added to the first emulsion in sequence, while maintaining the water temperature. The mixture is magnetized by an electromagnetic magnetizer and mechanically stirred until homogeneous to obtain the second emulsion. S3. Slowly add polyacrylamide to the second emulsion, maintain the water temperature, and stir at high speed until uniform, finally obtaining a composite concrete anti-seepage internal curing agent.
[0005] Preferably, the water in S1 is heated to 60°C.
[0006] Preferably, in step S1, the water temperature is maintained at 60°C, and the mixture is ultrasonically dispersed and mechanically stirred for 30 minutes.
[0007] Preferably, in step S2, the water temperature is maintained at 60°C, and the electromagnetic magnetizer is used to magnetize and mechanically stir for 60 minutes.
[0008] Preferably, in step S3, the water temperature is maintained at 60°C, and the mixture is stirred at high speed for 30 minutes.
[0009] Preferably, the rotational speed in S3 is 5000 r / min.
[0010] Preferably, the preparation method comprises 10-30 parts paraffin emulsion, 10-40 parts cellulose xanthate-grafted acrylate, 10-40 parts polyvinyl alcohol, 1-5 parts polyacrylamide, and 15-30 parts water.
[0011] Another objective of this invention is to provide an application of a composite concrete anti-seepage internal curing agent, wherein the composite concrete anti-seepage internal curing agent is evenly sprayed onto the concrete surface by a sprayer after the initial setting of the concrete, and cured under natural conditions for 24 hours.
[0012] Preferably, the spray thickness is 1 cm.
[0013] The beneficial effects of this invention are as follows: Through the emulsifying and dispersing effect of paraffin emulsion, polyvinyl alcohol and polyacrylamide are uniformly coated on the concrete surface, forming a unique "isolation-water retention" composite functional layer: on the one hand, the paraffin emulsion effectively blocks the intrusion of external moisture; on the other hand, polyvinyl alcohol and polyacrylamide work synergistically to exert excellent water retention, allowing the internal moisture of the concrete to be retained. This synergistic mechanism significantly improves the overall impermeability of the concrete. Meanwhile, the raw materials used in this invention are more streamlined compared to existing curing agent technologies. While ensuring that performance is not affected or even optimized, the raw material composition is effectively simplified, not only reducing material costs and the complexity of formulation, but also improving the convenience of production and construction, making it more practical and economical.
[0014] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. Detailed Implementation
[0015] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0016] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.
[0017] Example 1 Take 2.5 kg of water and heat it to 60°C. Then add 1 g of polyvinyl alcohol to the water and mix. Keep the water temperature at 60°C, ultrasonically disperse and mechanically stir for 30 min to obtain the first emulsion. 3.0 kg of paraffin emulsion and 1.0 kg of cellulose xanthate-grafted acrylate were slowly added to the first emulsion in sequence. The water temperature was maintained at 60°C, and the mixture was magnetized with an electromagnetic magnetizer and mechanically stirred for 60 min to obtain the second emulsion. 0.5 kg of polyacrylamide was slowly added to the second emulsion, the water temperature was kept at 60℃, and the mixture was stirred at high speed for 30 minutes at a speed of 5000 r / min. Finally, the composite concrete anti-seepage internal curing agent was obtained.
[0018] Example 2 Take 3.0 kg of water and heat it to 60°C. Then add 1.0 kg of polyvinyl alcohol to the water and mix. Keep the water temperature at 60°C, ultrasonically disperse and mechanically stir for 30 min to obtain the first emulsion. 4.0 kg of paraffin emulsion and 1.5 kg of cellulose xanthate-grafted acrylate were slowly added to the first emulsion in sequence. The water temperature was maintained at 60°C, the emulsion was magnetized by an electromagnetic magnetizer and mechanically stirred for 60 min to obtain the second emulsion. 0.25 kg of polyacrylamide was slowly added to the second emulsion, the water temperature was kept at 60℃, and the mixture was stirred at high speed for 30 minutes at a speed of 5000 r / min. Finally, the composite concrete anti-seepage internal curing agent was obtained.
[0019] Example 3 Take 4.0 kg of water and heat it to 60°C. Then add 2.5 kg of polyvinyl alcohol to the water and mix. Keep the water temperature at 60°C, ultrasonically disperse and mechanically stir for 30 min to obtain the first emulsion. 5.0 kg of paraffin emulsion and 4.0 kg of cellulose xanthate-grafted acrylate were slowly added to the first emulsion in sequence. The water temperature was maintained at 60°C, and the mixture was magnetized with an electromagnetic magnetizer and mechanically stirred for 60 min to obtain the second emulsion. 0.75 kg of polyacrylamide was slowly added to the second emulsion, the water temperature was kept at 60℃, and the mixture was stirred at high speed for 30 minutes at a speed of 5000 r / min. Finally, the composite concrete anti-seepage internal curing agent was obtained.
[0020] Example 4 Take 5.0 kg of water and heat it to 60°C. Then add 1.5 kg of polyvinyl alcohol to the water and mix. Keep the water temperature at 60°C, ultrasonically disperse and mechanically stir for 30 min to obtain the first emulsion. 2.0 kg of paraffin emulsion and 2.0 kg of cellulose xanthate-grafted acrylate were slowly added to the first emulsion in sequence. The water temperature was maintained at 60°C, and the mixture was magnetized with an electromagnetic magnetizer and mechanically stirred for 60 min to obtain the second emulsion. 0.4 kg of polyacrylamide was slowly added to the second emulsion, the water temperature was kept at 60℃, and the mixture was stirred at high speed for 30 minutes at a speed of 5000 r / min. Finally, the composite concrete anti-seepage internal curing agent was obtained.
[0021] Example 5 Take 3.5 kg of water and heat it to 60°C. Then add 3.0 kg of polyvinyl alcohol to the water and mix. Keep the water temperature at 60°C, ultrasonically disperse and mechanically stir for 30 min to obtain the first emulsion. 4.0 kg of paraffin emulsion and 1.5 kg of cellulose xanthate-grafted acrylate were slowly added to the first emulsion in sequence. The water temperature was maintained at 60°C, the emulsion was magnetized by an electromagnetic magnetizer and mechanically stirred for 60 min to obtain the second emulsion. 0.25 kg of polyacrylamide was slowly added to the second emulsion, the water temperature was kept at 60℃, and the mixture was stirred at high speed for 30 minutes at a speed of 5000 r / min. Finally, the composite concrete anti-seepage internal curing agent was obtained.
[0022] Testing and Experiment The compressive strength and water absorption of the concrete sprayed with the composite concrete anti-seepage internal curing agent of the present invention were tested according to the method of JC / T945-2005. The experimental results are shown in Table 1.
[0023] Table 1. Capillary water absorption rate As shown in Table 1 above, especially Examples 4 and 5, their 24-hour water absorption rates (2.0 × 10³ and 1.8 × 10³ mm) are significantly lower than those of other examples and are generally superior to many existing curing agent technologies that require more raw materials. This indicates that the simplified formulation may result in a more efficient "isolation-water retention" synergistic mechanism, optimizing the impermeability. The compressive strength of all examples meets high-standard engineering requirements, proving that the simplified formulation does not weaken the protection of concrete strength.
[0024] The direct benefits of a simplified formula include: reduced costs: fewer types of raw materials make procurement and inventory management simpler, and raw material costs are easier to control.
[0025] Simplified formulation and production: Reduces the risk of measurement errors and process complexity when compounding multiple raw materials, and improves the stability of product batches and production efficiency.
[0026] Improved ease of application: A simple formula means that on-site dilution, spraying and other operations are easier to master, reducing the risk of performance fluctuations caused by improper proportions.
[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.
Claims
1. A composite concrete anti-seepage internal curing agent, characterized in that: The raw materials of the maintenance agent include 10-30 parts by weight of paraffin emulsion, 10-40 parts of cellulose xanthate-grafted acrylate, 10-40 parts of polyvinyl alcohol, 1-5 parts of polyacrylamide, and 15-30 parts of water.
2. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 1, characterized in that: The specific steps of the preparation method are as follows: S1. Heat the water, then add polyvinyl alcohol to the water and mix, maintain the water temperature, ultrasonically disperse and mechanically stir until uniform to obtain the first emulsion; S2. Paraffin emulsion and cellulose xanthate grafted acrylate are slowly added to the first emulsion in sequence, while maintaining the water temperature. The mixture is magnetized by an electromagnetic magnetizer and mechanically stirred until homogeneous to obtain the second emulsion. S3. Slowly add polyacrylamide to the second emulsion, maintain the water temperature, and stir at high speed until uniform, finally obtaining a composite concrete anti-seepage internal curing agent.
3. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 2, characterized in that: The water in S1 is heated to 60°C.
4. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 2, characterized in that: In step S1, the water temperature is maintained at 60°C, and the mixture is ultrasonically dispersed and mechanically stirred for 30 minutes.
5. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 2, characterized in that: In step S2, the water temperature is maintained at 60°C, and the electromagnetic magnetizer is used to magnetize and mechanically stir for 60 minutes.
6. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 2, characterized in that: In step S3, the water temperature is maintained at 60°C, and the mixture is stirred at high speed for 30 minutes.
7. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 2, characterized in that: The rotational speed in S3 is 5000 r / min.
8. The preparation method of the composite concrete anti-seepage internal curing agent according to claim 2, characterized in that: The preparation method comprises 10-30 parts paraffin emulsion, 10-40 parts cellulose xanthate grafted acrylate, 10-40 parts polyvinyl alcohol, 1-5 parts polyacrylamide, and 15-30 parts water.
9. The application of the composite concrete anti-seepage internal curing agent according to claim 1, characterized in that: The composite concrete anti-seepage internal curing agent is sprayed evenly onto the concrete surface using a sprayer after the concrete has initially set, and then cured under natural conditions for 24 hours.
10. The application of the composite concrete anti-seepage internal curing agent according to claim 9, characterized in that: The spray thickness is 1 cm.