Aluminum formwork release agent

Abstract

The application relates to the field of aluminum formworks, and particularly discloses an aluminum formwork demoulding agent. The aluminum formwork demoulding agent comprises the following components in parts by weight: 100-120 parts of polydimethylsiloxane, 20-40 parts of a microcapsule composition, 20-30 parts of a silane coupling agent, 40-60 parts of an elastomer emulsion and 80-100 parts of a solvent, wherein the microcapsule composition comprises polyoxyethylene resin and fluorocarbon resin. The aluminum formwork demoulding agent has the advantages of solving the problem that pores are easily formed on the surface of concrete after the use of an oily demoulding agent.

Description

TECHNICAL FIELD

[0001] The application relates to the field of aluminum formworks, in particular to an aluminum formwork release agent. BACKGROUND

[0002] In traditional construction, wooden formworks are the main formwork materials used. However, with the continuous expansion of the scale of construction and the demand for accelerating construction speed, wooden formworks face a series of problems, such as heavy weight, easy deformation, easy deformation due to moisture, and difficulty in repeated use. These problems limit the improvement of construction efficiency and quality. In order to overcome the shortcomings of traditional wooden formworks and meet the requirements of modern buildings for high efficiency, environmental protection and economy, aluminum formworks have gradually emerged and developed rapidly.

[0003] Aluminum formworks are made of high-strength aluminum alloy materials, which have a lighter weight compared to traditional wooden formworks, making it easier to transport during construction. At the same time, aluminum formworks have characteristics such as corrosion resistance, oxidation resistance, and wear resistance, and can be used for a long time. Aluminum formworks can be designed and manufactured according to specific building requirements to meet various structural forms, sizes and load requirements. It can adapt to various building shapes, such as straight lines, curves, stairs, etc. The aluminum formwork system adopts modular design, which is easy to install and quick. Through the combination and assembly of connectors, bolts and other components, the construction time and labor cost are reduced. Due to the durability and reliability of aluminum formwork materials, it can be reused multiple times, effectively reducing the cost of formworks and reducing the impact on the environment.

[0004] However, aluminum formworks often have the problem of concrete residue on their surface. Currently, release agents are commonly used to solve this problem. The existing release agents are oil-based release agents and water-based release agents. Oil-based release agents have good adhesion, but the solvents in oil-based release agents will quickly evaporate, forming a large number of bubbles on the surface of the concrete, making the concrete surface rough and porous, which leads to problems such as strength reduction and cracking of the concrete. In addition, oil-based release agents can reduce the surface tension of the concrete surface, causing water to accumulate and form small bubbles on the surface of the concrete. This phenomenon is commonly referred to as "surface adsorption". While water-based release agents have good release effect, they are easily washed away by rain, so repeated brushing is required, making the construction process complex. SUMMARY

[0005] In order to solve the problem of easy formation of pores on the surface of the concrete after using oil-based release agents, the application provides an aluminum formwork release agent.

[0006] The aluminum formwork release agent provided by the application adopts the following technical scheme:

[0007] An aluminum form release agent comprises, by weight, polydimethylsiloxane 100-120 parts, microcapsule composition 20-40 parts, silane coupling agent 20-30 parts, elastomer emulsion 40-60 parts, and solvent 80-100 parts, wherein the microcapsule composition comprises polyoxyethylene resin and fluorocarbon resin.

[0008] By adopting the above technical solution, the polydimethylsiloxane reduces the friction between the concrete and the aluminum form through lubrication, making the concrete release more smoothly and reducing the generation of residues. The silane coupling agent improves the overall durability by enhancing the adhesion between the concrete and the elastomer emulsion, reducing surface defects after release. The addition of the elastomer emulsion can adjust the flexibility and elasticity of the aluminum form release agent, adapt to the surface changes and movements of the aluminum form, and improve the service life and reliability.

[0009] The polyoxyethylene resin and fluorocarbon resin in the microcapsule composition are uniformly dispersed in the coating in the form of tiny particles, forming a protective film that can prevent the oil-based release agent from excessive adsorption on the concrete surface and reduce the formation of pores. It improves the smoothness and density of the concrete surface. The polyoxyethylene resin and fluorocarbon resin have good anti-sticking and lubricating properties, which can reduce the adhesion between the concrete and the aluminum form, making the release easier and smoother. The fluorocarbon resin has excellent weather resistance and chemical resistance, which can maintain stability in external environments. The fluorocarbon resin in the microcapsule composition provides additional durability and protection to the concrete, making it more resistant to ultraviolet light, oxidation, and other environmental factors, allowing the coating to be reused.

[0010] Optionally, the mass ratio of the polyoxyethylene resin to the fluorocarbon resin in the microcapsule composition is (3-5):(5-7).

[0011] By adopting the above technical solution, the polyoxyethylene resin has better anti-sticking and wetting properties, while the fluorocarbon resin has better weather resistance and chemical resistance. By adjusting the ratio of the polyoxyethylene resin and the fluorocarbon resin, the effect of the microcapsule composition can be optimized, solving the problem of pore formation on the concrete surface after the use of the oil-based release agent, and the coating of the release agent attached to the aluminum form can be used for 20-25 times.

[0012] Optionally, the preparation method of the microcapsule composition comprises the following steps:

[0013] S1, resin mixing: uniformly mix the polyoxyethylene resin and the fluorocarbon resin to obtain a resin mixture;

[0014] S2, microemulsification process: dissolve the resin mixture in dimethylformamide to form a resin solution, add sodium dodecyl sulfate emulsifier to the resin solution, and treat with ultrasonic waves to form a stable emulsion in which the polyoxyethylene resin and fluorocarbon resin are dispersed in the form of fine particles in the solvent;

[0015] S3, crosslinking reaction: add an epoxy resin crosslinking agent to the resin emulsion after microemulsification, incubate at 40-80°C, and continue the crosslinking reaction for 2-6 hours to form a three-dimensional network structure of the dispersed microcapsule particles;

[0016] S4, microcapsule collection: obtain the microcapsule composition by centrifugation and filtration.

[0017] By adopting the above technical solution, the emulsifier has the dual properties of hydrophilicity and hydrophobicity. During the emulsification process, the emulsifier molecules will be arranged on the interface of the polyoxyethylene resin and the fluorocarbon resin to form a stable boundary layer (surfactant adsorption layer). This boundary layer can prevent the aggregation and precipitation of particles and maintain the dispersion state of the microcapsules. Ultrasonic treatment can be used in the microemulsification process to break up large particles, promote the mixing of the emulsifier and the resin, and uniformly disperse the polyoxyethylene resin and the fluorocarbon resin in the solvent. The mechanical action of ultrasonic waves breaks up aggregates by generating high-frequency vibrations, dispersing them into smaller particles, and providing a local high-shear field, which helps the emulsifier mix with the resin. The functional groups in the epoxy resin crosslinking agent react with the active groups in the polyoxyethylene resin and the fluorocarbon resin to form covalent bonds. In this way, the molecules between the polyoxyethylene resin and the fluorocarbon resin can be crosslinked with each other to form a three-dimensional network structure. This network structure gives the microcapsules higher stability and durability, and the crosslinked microcapsules form a stable protective film in the coating, thereby improving the durability of the aluminum film plate release agent forming the coating, and reducing the formation of pores.

[0018] Optionally, the aluminum template release agent also includes 5-10 parts by weight of palmitic acid.

[0019] By adopting the above technical solution, the palmitic acid has the properties of a surfactant, which can improve the wettability and interfacial compatibility of the microcapsule composition with the surface of the aluminum template. This helps to improve the adhesion and stability of the microcapsules on the template surface. The addition of palmitic acid can promote the uniform dispersion of the polyoxyethylene resin, fluorocarbon resin, and other ingredients. It can effectively prevent the deposition and aggregation of the ingredients in the microcapsules, maintaining the stability and consistency of the microcapsules. Palmitic acid has good lubricating properties, which can reduce the friction between the concrete and the aluminum template. This helps to reduce the formation of pores on the surface of the concrete.

[0020] Optionally, the elastomer emulsion is selected from one of an acrylic emulsion or a polyurethane emulsion.

[0021] By adopting the technical scheme, the elastomer emulsion can form a separation film to effectively separate the concrete from the aluminum formwork. This can prevent the concrete from directly contacting the aluminum formwork and reduce adhesion and residue. The components in the elastomer emulsion have filling and repairing capabilities. When the concrete is separated from the aluminum formwork, the components in the emulsion can fill the gaps and repair surface damage, making it more uniform and smooth. The elastomer emulsion provides an additional protective layer after the concrete hardens. This helps prevent moisture penetration and erosion, reducing the formation of pores and cavities in the concrete.

[0022] Optionally, the solvent is selected from one or more of isopropyl alcohol, butanol, and citrus oil.

[0023] By adopting the technical scheme, isopropyl alcohol and butanol as organic solvents have strong solubility, which can dissolve microcapsule composition, silane coupling agent and other ingredients. This helps to ensure that each component is fully dissolved and uniformly mixed, improving the stability and consistency of the product. Isopropyl alcohol and butanol have low boiling points and volatility, which can quickly evaporate and reduce the formation of residues. The components in the citrus oil have low viscosity, which can effectively reduce the overall formula viscosity. This helps to improve the coating performance of the product, making it easier to coat on the surface of the aluminum formwork, achieving uniform coating.

[0024] Optionally, it also includes 15-30 parts by weight of nano calcium carbonate.

[0025] By adopting the technical scheme, nano calcium carbonate has small particle size and high specific surface area, which can fill the small pits and defects on the surface of the aluminum formwork at the microscale. This helps to improve the flatness and density of the coating, reducing the formation of pores and voids. Nano calcium carbonate has good reinforcing effect, which can improve the hardness, compressive strength and wear resistance of the coating. It can increase the mechanical stability of the coating, making it more durable and durable. Nano calcium carbonate can play a role in rheological adjustment in the coating, improving the coating performance and uniformity of the coating. Nano calcium carbonate has excellent barrier properties, which can effectively prevent the penetration of oxygen, moisture and other chemicals. This helps to enhance the corrosion resistance and weather resistance of the coating, prolonging the service life of the aluminum formwork.

[0026] Optionally, the nano calcium carbonate particle size is 10-50 nm.

[0027] By adopting the technical scheme, since the nano calcium carbonate particles are very small and have a large specific surface area, they can better fill the small pits and defects on the surface of the aluminum formwork. This will improve the flatness and density of the coating, reduce the formation of pores and voids, and increase the hardness and strength of the coating, making it more durable and durable.

[0028] In summary, the present application has the following advantages:

[0029] 1. The polyoxyethylene resin and fluorocarbon resin in the microcapsule composition are uniformly dispersed in the coating in the form of tiny particles, forming a protective film that prevents excessive adsorption of the oil-based release agent on the concrete surface and reduces the formation of air holes. It improves the smoothness and density of the concrete surface. The polyoxyethylene resin and fluorocarbon resin have good anti-adhesion and lubrication properties, which can reduce the adhesion between the concrete and the aluminum formwork, making the release easier and smoother. The fluorocarbon resin has excellent weather resistance and chemical resistance, which can maintain stability in external environment. The fluorocarbon resin in the microcapsule composition provides additional durability and protection to the concrete, making it more resistant to environmental factors such as ultraviolet light and oxidation, allowing the coating to be reused.

[0030] 2. The polyoxyethylene resin in the application has better anti-adhesion and wetting properties, while the fluorocarbon resin has better weather resistance and chemical resistance. By adjusting the ratio of polyoxyethylene resin and fluorocarbon resin, the effect of the microcapsule composition can be optimized, solving the problem of air holes on the concrete surface after using the oil-based release agent. The coating of the release and protection integrated agent attached to the aluminum formwork can be used for 20-25 times.

[0031] 3. The emulsifier in the application has hydrophilic and hydrophobic properties. During the emulsification process, the emulsifier molecules will be arranged on the interface of the polyoxyethylene resin and fluorocarbon resin, forming a stable boundary layer (surfactant adsorption layer). This boundary layer can prevent the aggregation and precipitation of particles, maintaining the dispersion state of the microcapsule. Ultrasonic treatment can be used in the microemulsification process to break down large particles, promote the mixing of emulsifiers and resins, and uniformly disperse the polyoxyethylene resin and fluorocarbon resin in the solvent. The mechanical action of ultrasonic waves breaks down the aggregates by generating high-frequency vibrations, making them disperse into smaller particles, and provides a local high shear field, which helps the emulsifier and resin to mix. The functional groups in the epoxy resin crosslinking agent react with the active groups in the polyoxyethylene resin and fluorocarbon resin, forming covalent bonds. In this way, the molecules between the polyoxyethylene resin and fluorocarbon resin can be crosslinked with each other, forming a three-dimensional network structure. This network structure gives the microcapsule higher stability and durability, and the crosslinked microcapsule forms a stable protective film in the coating, thereby improving the durability of the aluminum formwork release and protection integrated agent coating and reducing the formation of air holes. DETAILED DESCRIPTION

[0032] The application will be further described in conjunction with the following examples.

[0033] Preparation example of microcapsule composition

[0034] Preparation example 1

[0035] A process for preparing a microcapsule composition is:

[0036] S1, resin mixing: 400 g of polyoxyethylene resin and 600 g of fluorocarbon resin are weighed and placed in the same container. The polyoxyethylene resin and fluorocarbon resin are thoroughly mixed by stirring, and the mixed polyoxyethylene resin and fluorocarbon resin are ground by a ball mill to control the particle size in the range of 0.1-5 μm, obtaining 1000 g of resin mixture.

[0037] S2, microemulsification process: the resin mixture is added to 2000 g of dimethylformamide solvent to form a resin solution. Then, sodium dodecyl sulfate emulsifier is added to the resin solution, and the amount of emulsifier is 5% of the mass of the resin mixture. After stirring uniformly, ultrasonic treatment is performed, the ultrasonic frequency is 40 kHz, and the ultrasonic treatment time is 15 min. The ultrasonic treatment can utilize the action of high-frequency vibration to uniformly disperse the polyoxyethylene resin and fluorocarbon resin in the resin solution in the form of small particles, forming a stable emulsion system.

[0038] S3, crosslinking reaction: 100 g of epoxy resin crosslinking agent is added to the microemulsified resin emulsion, and the mixture is mixed thoroughly. Next, the mixture is kept in a constant temperature water bath at 60°C±5°C, and the constant temperature water bath is kept for 4 hours. In this process, the epoxy resin crosslinking agent reacts with the polyoxyethylene resin and fluorocarbon resin to form crosslinking points, so that the dispersed microcapsule particles are connected to each other, and finally a three-dimensional network structure is formed.

[0039] S4, microcapsule collection: the microcapsule composition after the crosslinking reaction needs to be collected and dried. The microcapsule is separated and collected from the reaction system by centrifugal filtration. The microcapsule is separated by a centrifuge, and then the supernatant is removed, leaving the precipitated microcapsule. The filter screen is used. The microcapsule composition is obtained.

[0040] Preparation Example 2

[0041] A process for preparing a microcapsule composition is: different from the preparation example 1 is that 300 g of polyoxyethylene resin and 700 g of fluorocarbon resin are weighed and placed in the same container in the S1 step. The polyoxyethylene resin and fluorocarbon resin are thoroughly mixed by stirring, and the mixed polyoxyethylene resin and fluorocarbon resin are ground by a ball mill to control the particle size in the range of 0.1-5 μm, obtaining 1000 g of resin mixture.

[0042] Preparation Example 3

[0043] A microcapsule composition is prepared by the following process:

[0044] Preparation Example 4

[0045] A microcapsule composition is prepared by the following process:

[0046] S1, Resin mixing: 400g of polyoxyethylene resin and 600g of fluorocarbon resin are weighed separately. The polyoxyethylene resin and fluorocarbon resin are ground separately by a ball mill to control the particle size within the range of 0.1-5 μm.

[0047] S2, Microemulsification process: 400g of polyoxyethylene resin and 600g of fluorocarbon resin are added to 1000g of dimethylformamide solvent to form a resin solution. Then, sodium dodecyl sulfate emulsifier is added to the resin solution, and the amount of emulsifier is 5% of the mass of polyoxyethylene resin and fluorocarbon resin, respectively. After stirring uniformly, ultrasonic treatment is performed, with an ultrasonic frequency of 40 kHz and a treatment time of 15 min. The ultrasonic treatment can utilize the action of high-frequency vibration to uniformly disperse the polyoxyethylene resin and fluorocarbon resin in the form of small particles in the solvent. The polyoxyethylene resin emulsion and fluorocarbon resin emulsion are mixed and stirred to form a stable emulsion system.

[0048] S3, Crosslinking reaction: 100g of epoxy resin crosslinking agent is added to the microemulsified resin emulsion and mixed thoroughly. Next, the mixture is incubated in a constant temperature water bath at 60°C±5°C for 4 hours. During this process, the epoxy resin crosslinking agent reacts with the polyoxyethylene resin and fluorocarbon resin to form crosslinking points, connecting the dispersed microcapsule particles to each other, and finally forming a three-dimensional network structure.

[0049] S4, Microcapsule collection: The microcapsule composition after the crosslinking reaction needs to be collected and dried. The microcapsules are separated and collected from the reaction system by centrifugal filtration. Centrifugation can be used to separate the microcapsules by a centrifuge, and then the supernatant is removed, leaving the precipitated microcapsules. Filtration uses a filter screen. The microcapsule composition is obtained.

[0050] Preparation Example 5

[0051] A microcapsule composition is prepared by the following process:

[0052] S1, resin mixing: 1000 g of fluorocarbon resin is weighed and placed in a container. The fluorocarbon resin is ground by a ball mill to control the particle size in the range of 0.1-5 pm.

[0053] S2, microemulsification process: The fluorocarbon resin is added to 2000 g of dimethylformamide solvent to form a resin solution. Then, sodium dodecyl sulfate emulsifier is added to the resin solution, and the amount of emulsifier is 5% of the mass of the fluorocarbon resin. After stirring uniformly, ultrasonic treatment is performed, the ultrasonic frequency is 40 kHz, and the ultrasonic treatment time is 15 min. The ultrasonic treatment can utilize the action of high-frequency vibration to uniformly disperse the fluorocarbon resin in the resin solution in the form of small particles, forming a stable emulsion system.

[0054] S3, crosslinking reaction: 100 g of epoxy resin crosslinking agent is added to the microemulsified resin emulsion, and the mixture is mixed thoroughly. Next, the mixture is incubated in a constant temperature water bath at 60°C±5°C for 4 hours. During this process, the epoxy resin crosslinking agent reacts with the fluorocarbon resin to form crosslinking points, connecting the dispersed microcapsule particles to each other, and finally forming a three-dimensional network structure.

[0055] S4, microcapsule collection: The microcapsule composition after the crosslinking reaction needs to be collected and dried. The microcapsules are separated and collected from the reaction system by centrifugal filtration. Centrifugation can separate the microcapsules using a centrifuge, and then the supernatant is removed, leaving the precipitated microcapsules. Filtration uses a filter screen. The microcapsule composition is obtained.

[0056] Preparation Example 6

[0057] A process for preparing a microcapsule composition is as follows:

[0058] S1, resin mixing: 1000 g of polyoxyethylene resin is weighed and placed in a container. The polyoxyethylene resin is ground by a ball mill to control the particle size in the range of 0.1-5 pm.

[0059] S2, microemulsification process: The polyoxyethylene resin is added to 2000 g of dimethylformamide solvent to form a resin solution. Then, sodium dodecyl sulfate emulsifier is added to the resin solution, and the amount of emulsifier is 5% of the mass of the polyoxyethylene resin. After stirring uniformly, ultrasonic treatment is performed, the ultrasonic frequency is 40 kHz, and the ultrasonic treatment time is 15 min. The ultrasonic treatment can utilize the action of high-frequency vibration to uniformly disperse the polyoxyethylene resin in the resin solution in the form of small particles, forming a stable emulsion system.

[0060] S3, Cross-linking reaction: 100 g of epoxy resin cross-linking agent is added to the micro-emulsified resin emulsion, and mixed thoroughly. Next, the mixture is kept in a constant temperature water bath at 60°C ± 5°C, and kept for 4 hours. During this process, the epoxy resin cross-linking agent reacts with the polyoxyethylene resin to form cross-linking points, and the dispersed microcapsule particles are connected to each other, and finally a three-dimensional network structure is formed.

[0061] S4, Microcapsule collection: The microcapsule composition after the cross-linking reaction needs to be collected and dried. The microcapsules are separated and collected from the reaction system by centrifugal filtration. Centrifugation can separate the microcapsules by using a centrifuge, and then the supernatant is removed, leaving the precipitated microcapsules. Filtration uses a filter screen. The microcapsule composition is obtained.

[0062] Example

[0063] Example 1

[0064] A preparation method of an aluminum template release agent is as follows:

[0065] Prepare 1000 g of polydimethylsiloxane, 200 g of microcapsule composition, 200 g of silane coupling agent, 400 g of elastomer emulsion, and 800 g of solvent, mix the components in a container and stir for 20 min to obtain an aluminum template release agent.

[0066] The microcapsule composition is prepared by Preparation Example 1, the elastomer emulsion is selected from an acrylic emulsion, and the solvent is selected from isopropyl alcohol.

[0067] Example 2

[0068] A preparation method of an aluminum template release agent is as follows:

[0069] Prepare 1200 g of polydimethylsiloxane, 400 g of microcapsule composition, 300 g of silane coupling agent, 600 g of elastomer emulsion, and 1000 g of solvent, mix the components in a container and stir for 20 min to obtain an aluminum template release agent.

[0070] The microcapsule composition is prepared by Preparation Example 1, the elastomer emulsion is selected from an acrylic emulsion, and the solvent is selected from isopropyl alcohol.

[0071] Example 3

[0072] A preparation method of an aluminum template release agent is as follows:

[0073] Prepare 1100 g of polydimethylsiloxane, 300 g of microcapsule composition, 250 g of silane coupling agent, 500 g of elastomer emulsion, and 900 g of solvent, mix the components in a container and stir for 20 min to obtain an aluminum template release agent.

[0074] The microcapsule composition is prepared according to Preparation Example 1, the elastomer emulsion is selected from an acrylic emulsion, and the solvent is selected from isopropyl alcohol.

[0075] Example 4

[0076] A preparation method of the aluminum formwork release agent is as follows:

[0077] The polydimethylsiloxane 1100 g, the microcapsule composition 300 g, the silane coupling agent 250 g, the elastomer emulsion 500 g, the solvent 900 g, and the palmitic acid 80 g are mixed in a container and stirred for 20 min to obtain the aluminum formwork release agent.

[0078] The microcapsule composition is prepared according to Preparation Example 1, the elastomer emulsion is selected from an acrylic emulsion, and the solvent is selected from isopropyl alcohol.

[0079] Example 5

[0080] A preparation method of the aluminum formwork release agent is as follows:

[0081] The polydimethylsiloxane 1100 g, the microcapsule composition 300 g, the silane coupling agent 250 g, the elastomer emulsion 500 g, the solvent 900 g, the palmitic acid 80 g, and the nano calcium carbonate 250 g are mixed in a container and stirred for 20 min to obtain the aluminum formwork release agent.

[0082] The microcapsule composition is prepared according to Preparation Example 1, the elastomer emulsion is selected from an acrylic emulsion, and the solvent is selected from isopropyl alcohol.

[0083] Example 6

[0084] A preparation method of the aluminum formwork release agent is as follows: the microcapsule composition is prepared according to Preparation Example 2.

[0085] Example 7

[0086] A preparation method of the aluminum formwork release agent is as follows: the microcapsule composition is prepared according to Preparation Example 3.

[0087] Comparative Example

[0088] Comparative Example 1

[0089] A preparation method of the aluminum formwork release agent is as follows: the microcapsule composition is prepared according to Preparation Example 4.

[0090] Comparative Example 2

[0091] A preparation method of the aluminum formwork release agent is as follows: the microcapsule composition is prepared according to Preparation Example 5.

[0092] Comparative Example 3

[0093] A preparation method of an aluminum formwork release agent, which is different from that of Example 5 in that the microcapsule composition is prepared by Preparation Example 6.

[0094] Performance detection test

[0095] Detection method

[0096] The release agents obtained in Examples 1-15 and Comparative Examples 1-3 were tested as follows:

[0097] Wettability test: 50 ml of the release agent in each of Examples 1-7 and Comparative Examples 1-3 was uniformly coated on an aluminum formwork, and the coating thickness was controlled to be 0.5 mm ± 0.1 mm. After the coating was left to stand in a ventilated environment for 24 h, the contact angle between the release agent coating and the concrete surface was measured. The smaller the contact angle, the better the wettability of the release agent coating.

[0098] Surface detection: 200 ml of the release agent in each of Examples 1-7 and Comparative Examples 1-3 was uniformly coated on an aluminum formwork, and the coating thickness was controlled to be 0.5 mm ± 0.1 mm. After the coating was left to stand in a ventilated environment for 24 h, the same concrete was cast in different aluminum formworks. After the concrete was cured at a constant temperature of 25°C and a constant humidity of 60% for 7 days and then demolded, the surface of the demolded concrete was observed using a scanning electron microscope, the bubble area was recorded, and defects and damages were observed.

[0099] Durability test: 200 ml of the release agent in each of Examples 1-7 and Comparative Examples 1-3 was uniformly coated on an aluminum formwork, and the coating thickness was controlled to be 0.5 mm ± 0.1 mm. After the coating was left to stand in a ventilated environment for 24 h, the same concrete was cast in different aluminum formworks. After the concrete was cured at a constant temperature of 25°C and a constant humidity of 60% for 7 days and then demolded, the above concrete casting, curing, and demolding process was repeated again, and the effective number of times of repeated use of the release agent coating was recorded.

[0100] Table 1 detection data statistics

[0101]

[0102] It can be seen from the combination of Example 5 and Comparative Example 1 and Table 1 that the effect of uniformly mixing the polyoxyethylene resin and fluorocarbon resin and then microemulsifying is better than that of microemulsifying the polyoxyethylene resin and fluorocarbon resin separately and then mixing them, which indicates that the polyoxyethylene resin and fluorocarbon resin after uniform mixing can better form a crosslinked network, the crosslinking agent can more effectively react with the two resins to form more complete and uniform crosslinking points, thereby building a stable three-dimensional network structure. The resin system after uniform mixing is more conducive to the stability of the microcapsules. The interaction and compatibility between the molecules of the two resins are enhanced, which can provide a more uniform and continuous interface and reduce the difference in interfacial tension. This helps to prevent the aggregation and separation of the microcapsules, improves the stability of the system, thereby improving the durability of the coating formed by the aluminum panel release agent, and reducing the formation of pores.

[0103] It can be seen from the combination of Example 5 and Comparative Examples 2-3 and Table 1 that in Comparative Examples 2 and 3, only one kind of resin is used as the raw material of the microcapsule composition, and the effect of Example 5 is obviously better than that of Comparative Examples 2-3, which indicates that the use of polyoxyethylene resin and fluorocarbon resin together can optimize the effect of the microcapsule composition, and the use of polyoxyethylene resin and fluorocarbon resin together in the microcapsule composition can have a synergistic effect and complementary effect. The polyoxyethylene resin and fluorocarbon resin in the microcapsule composition are uniformly dispersed in the coating in the form of fine particles, forming a protective film that can prevent the excessive adsorption of the oily release agent on the surface of the concrete and reduce the formation of pores. It improves the smoothness and density of the concrete surface. The polyoxyethylene resin and fluorocarbon resin have good anti-sticking and lubricating properties, which can reduce the adhesion between the concrete and the aluminum mold panel, making the release easier and smoother. The fluorocarbon resin has excellent weather resistance and chemical resistance, which can maintain stability in external environments. The fluorocarbon resin in the microcapsule composition provides additional durability and protection to the concrete, making it more resistant to environmental factors such as ultraviolet light and oxidation, allowing the coating to be reused. Through this combined use, the pore problem caused by the use of oily release agent can be solved.

[0104] It can be seen from the combination of Examples 1-3 and Table 1 that by changing the component ratio of the aluminum mold panel release agent, the performance of the aluminum mold panel release agent can be optimized, which can effectively solve the problem of easy formation of pores on the surface of the concrete after the use of oily release agent, and improve the quality and smoothness of the concrete surface.

[0105] It can be seen from the combination of embodiments 3-5 and table 1 that the addition of palmitic acid can promote the uniform dispersion of polyoxyethylene resin, fluorocarbon resin and other ingredients. It can effectively prevent the deposition and agglomeration of ingredients in the microcapsule, maintain the stability and consistency of the microcapsule. Palmitic acid has good lubricating properties, which can reduce the friction between concrete and aluminum formwork. This helps to reduce the generation of pores on the surface of the concrete. Nano calcium carbonate has small particle size and high specific surface area, which can fill the small pits and defects on the surface of the aluminum formwork at the microscale. This helps to improve the flatness and density of the coating, reduce the formation of pores and voids.

[0106] It can be seen from the combination of embodiments 5-7 and table 1 that by adjusting the ratio of polyoxyethylene resin and fluorocarbon resin, the effect of the microcapsule composition can be optimized, the problem of easy formation of pores on the surface of the concrete after the use of oil-based release agent can be solved, and the coating of the release and protection integrated agent attached to the aluminum formwork can be used for 20-25 times.

[0107] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An aluminum mold releasing agent and preservative integrated agent, characterized by, By weight parts, including the following components: polydimethylsiloxane 100-120 parts, microcapsule composition 20-40 parts, silane coupling agent 20-30 parts, elastomer emulsion 40-60 parts, solvent 80-100 parts, the microcapsule composition includes polyoxyethylene resin and fluorocarbon resin; the mass ratio of polyoxyethylene resin and fluorocarbon resin in the microcapsule composition is (3-5):(5-7); the preparation method of the microcapsule composition includes the following steps: S1, resin mixing: uniformly mix polyoxyethylene resin and fluorocarbon resin to obtain a resin mixture; S2, microemulsion process: dissolve the resin mixture in dimethylformamide to form a resin solution, add an emulsifier to the resin solution, and treat with ultrasonic waves to form a stable emulsion, wherein the polyoxyethylene resin and fluorocarbon resin are dispersed in the form of small particles in the solvent; S3, crosslinking reaction: add an epoxy resin crosslinking agent to the resin emulsion after microemulsion, and incubate at 40-80℃ for 2-6 hours to make the dispersed microcapsule particles form a three-dimensional network structure; S4, microcapsule collection: obtain the microcapsule composition by centrifugation and filtration.

2. The one-pack agent for an aluminum mold according to claim 1, characterized by: Also including 5-10 parts of palmitic acid.

3. The one-pack agent for an aluminum mold according to claim 1, characterized by: The elastomer emulsion is selected from one or more of acrylic emulsion, polyurethane emulsion and latex emulsion.

4. The one-pack agent for an aluminum mold according to claim 1, characterized by: The solvent is selected from one or more of isopropyl alcohol, butanol and citrus oil.

5. The one-pack agent for an aluminum mold according to claim 1, characterized by: Also including 15-30 parts of nano calcium carbonate by weight.

6. The one-pack agent for an aluminum mold according to claim 5, wherein The nano calcium carbonate particle size is 10-50 nm.

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