Easy-to-release aluminum film plate and preparation method thereof

Abstract

The present invention discloses an easy-to-release aluminum film plate and a preparation method thereof. The method comprises the following steps: step 1, degreasing the surface of the aluminum film plate, then cleaning and drying it; step 2, roller coating the dried aluminum film plate; step 3, ultraviolet curing the aluminum film plate after roller coating; wherein the coating comprises, by weight, 35-40 parts of polyurethane acrylate, 10-20 parts of epoxy acrylate, 15-25 parts of trimethylolpropane triacrylate, 10-15 parts of adipic acid diacrylate, 3-10 parts of anticoagulant, 1-5 parts of 2-hydroxy-2-methyl-1-phenylacetone, 1-3 parts of polydimethylsiloxane, and 5-10 parts of filler; the anticoagulant is prepared by heating and melting dehydroabietic acid and C5 petroleum resin in a preset mass ratio, and grinding them into fine powder after cooling. The present invention aims to achieve efficient demoulding of concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of building aluminum formwork, in particular to an easy-to-release aluminum film plate and a preparation method thereof. Background Art

[0002] Aluminum formwork is widely used in construction projects. Cost control requires repeated use, and to protect and maximize the number of uses within a single project, it can be sprayed with paint. However, the coatings currently available for aluminum formwork have limited performance, including poor hardness, poor water and corrosion resistance, an uneven surface, and difficulty cleaning concrete adhesion. Consequently, the protective and release properties of these coatings are limited, with the coating peeling off after just two or three uses. To ensure optimal release, most aluminum formwork requires a layer of release agent applied to the surface before use to prevent adhesion. Release agents for aluminum formwork are primarily water-based or oil-based liquid coatings, requiring multiple applications and requiring a long film formation time of approximately 5-8 hours. Furthermore, the application process requires careful attention to thickness and uniformity, and the surface must be kept level to prevent the release agent from dripping. Consequently, due to construction environment constraints, effective film formation is difficult to achieve. Furthermore, the excessive use of release agents not only impacts project progress, but also poses health risks to on-site construction workers due to long-term exposure.

[0003] The existing patent publication number is CN101372562A, which is an effective UV-curable hydrophobic and anti-fouling coating and its preparation method. The UV-curable hydrophobic and anti-fouling coating is prepared by adding modified nano-silica to a photosensitive resin, dispersing and defoaming to obtain the UV-curable hydrophobic and anti-fouling coating. The modified nano-silica accounts for 0.1% to 20% of the mass of the photosensitive resin in terms of silica mass. The modified nano-silica is prepared by the following method: adding nano-silica particles to an organic solvent containing a surfactant, stirring evenly, vacuum drying, and crushing to obtain the modified nano-silica. Although the preparation method is simple and easy to operate, the UV-curable hydrophobic and anti-fouling coating has good hydrophobic and self-cleaning properties. Whether it can be applied to the surface of an aluminum template to achieve multiple effective demolding of the aluminum template remains to be considered. Therefore, it is urgent to propose an aluminum template that can be repeatedly and efficiently demolded. Summary of the Invention

[0004] The main purpose of the present invention is to provide an easy-to-release aluminum film plate and a preparation method thereof, aiming to solve the technical problem of poor repeated demoulding effect of existing aluminum templates.

[0005] To achieve the above object, the present invention provides a method for preparing an easily demoulding aluminum film plate, the method comprising the following steps:

[0006] Step 1: Degreasing the surface of the aluminum film, and then cleaning and drying it;

[0007] Step 2, roller coating the dried aluminum film;

[0008] Step 3, subjecting the aluminum film plate coated with the coating to ultraviolet curing treatment;

[0009] The coating comprises, by weight, 35 to 40 parts of polyurethane acrylate, 10 to 20 parts of epoxy acrylate, 15 to 25 parts of trimethylolpropane triacrylate, 10 to 15 parts of adipic acid diacrylate, 3 to 10 parts of anticoagulant, 1 to 5 parts of 2-hydroxy-2-methyl-1-phenylacetone, 1 to 3 parts of polydimethylsiloxane, and 5 to 10 parts of filler;

[0010] The anticoagulant is prepared by heating and melting dehydroabietic acid and C5 petroleum resin in a preset mass ratio, and grinding the mixture into fine powder after cooling.

[0011] Optionally, the method for preparing the coating in step 2 comprises the following steps:

[0012] In a light-proof environment, start stirring and add preset weight portions of polyurethane acrylate, epoxy acrylate, trimethylolpropane triacrylate, adipic acid diacrylate, anticoagulant, 2-hydroxy-2-methyl-1-phenylpropanone, polydimethylsiloxane and anticoagulant in sequence at a speed of 400-800 r / min, and maintain stirring at a speed of 400-800 r / min for 30-40 minutes;

[0013] Then add the filler at 600-1000 r / min and stir for one hour, and finally disperse at 3000-4000 r / min for 10-20 minutes.

[0014] Optionally, the mass ratio of dehydroabietic acid to C5 petroleum resin in the anticoagulant is (40-60): (30-70).

[0015] Optionally, in step 3, the UV curing light power is 200-300W, the distance is 10-15 cm, and the time is 5-15 minutes.

[0016] Optionally, in step 2, the coating amount is 8-10 g / m 2 .

[0017] Optionally, the anticoagulant has a particle size of 50-200 μm.

[0018] Optionally, the temperature at which the dehydroabietic acid and C5 petroleum resin are heated and melted is 60-150°C.

[0019] Optionally, the filler includes one of kaolin and talc.

[0020] In addition, in order to achieve the above-mentioned purpose, the present invention also provides an easy-to-release aluminum film plate, which is prepared by any of the above-mentioned methods for preparing the easy-to-release aluminum film plate.

[0021] Beneficial effects:

[0022] 1) In the preparation method of the easy-to-release aluminum film sheet of the present invention, an anticoagulant composed of dehydroabietic acid and C5 petroleum resin is added to the coating, and ultraviolet light curing is performed, and the coating rolled on the surface of the aluminum film sheet is cured to prepare a concrete mortar formwork. The prepared aluminum film sheet can be demolded more than 15 times, and the template surface has basically no obvious sticky film, no bubbles, the surface is clean, and the surface of the prefabricated part is smooth.

[0023] 2) The efficient demoulding mechanism of the aluminum film sheet in the present invention is that after the coating is cured by ultraviolet light, the carboxyl functional groups of the dehydroabietic acid component, which is an anticoagulant component, present on the surface of the cured coating have a retarding effect, which can interfere with the formation of Si-O-Si bonds, making it difficult for the concrete surface to solidify and adhere to the surface of the aluminum formwork. In addition, the carbon ring of the dehydroabietic acid after ultraviolet light curing is highly compatible with the coating system, thereby increasing the dense connection between the various parts of the internal coating after curing. In addition, the C5 petroleum resin in the component provides a good hydrophobic effect, thereby enhancing the hydrophobicity of the aluminum formwork surface, ultimately improving the demoulding effect of the aluminum film sheet.

[0024] 3) The particle size of the anticoagulant is controlled within 50-200 μm to enhance the efficient interaction between the components in the anticoagulant and other components after the coating is cured and the concrete surface, thereby improving the demoulding effect of the aluminum film board. DETAILED DESCRIPTION

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments.

[0027] The present invention provides an embodiment of a method for preparing an easily demoulding aluminum film plate, the method comprising the following steps:

[0028] Step 1: Degrease the aluminum stencil surface, then clean and dry it. Generally, soak the aluminum stencil in a degreasing solution for 10-20 minutes, then scrub it, rinse it with clean water, and finally dry it at 60-80°C for 1-2 hours. This step effectively removes impurities from the aluminum stencil surface, allowing the paint to adhere more firmly to the surface and improve protection after the paint cures.

[0029] Step 2: Roll-coat the dried aluminum film.

[0030] Specifically, the coating comprises, by weight, 35-40 parts of polyurethane acrylate, 10-20 parts of epoxy acrylate, 15-25 parts of trimethylolpropane triacrylate, 10-15 parts of adipic acid diacrylate, 3-10 parts of an anticoagulant, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 1-3 parts of polydimethylsiloxane, and 5-10 parts of a filler. The filler comprises one of kaolin and talc. The filler can form an anti-wear protective layer after mixing with other coating components, thereby imparting an anti-wear effect to the coating on the surface of the aluminum template after curing.

[0031] Furthermore, the preparation method of the coating comprises the following steps:

[0032] Stirring is started and preset weight portions of polyurethane acrylate, epoxy acrylate, trimethylolpropane triacrylate, adipic acid diacrylate, anticoagulant, 2-hydroxy-2-methyl-1-phenylpropanone, polydimethylsiloxane and anticoagulant are added in sequence at a speed of 400-800 r / min, and stirring is maintained at a speed of 400-800 r / min for 30-40 minutes; then, a filler is added at a speed of 600-1000 r / min and stirred for one hour, and finally, the mixture is dispersed at a speed of 3000-4000 r / min for 10-20 minutes to obtain a coating for an aluminum film plate. The entire coating preparation process is carried out under light-proof conditions.

[0033] Furthermore, the anticoagulant is prepared by heating and melting dehydroabietic acid and C5 petroleum resin in a preset mass ratio, grinding the mixture into fine powder after cooling, and controlling the obtained powder particle size to be 50-200 μm, and controlling the heating and melting temperature to be 60-150° C. The generated anticoagulant contains a carboxyl functional group.

[0034] Furthermore, the coating amount of the coating is 8-10g / m 2 , the coating amount can be adjusted accordingly according to actual needs.

[0035] Step 3: subjecting the aluminum film plate coated with the coating to ultraviolet curing treatment.

[0036] Specifically, under the action of ultraviolet light, the coating applied to the surface of the aluminum film plate can make the carboxyl functional group of the dehydroabietic acid in the anticoagulant component have a retarding effect. The principle is that the carboxyl functional group can interfere with the formation of Si-O-Si bonds. That is, when the aluminum film plate is normally loaded with concrete, the surface of the concrete is not easy to solidify and adhere to the surface of the aluminum formwork, thereby making it convenient to remove the concrete from the aluminum film plate without adding a release agent, and it can also be reused many times.

[0037] Furthermore, after UV curing, the carbon rings of dehydroabietic acid are highly compatible with the other coating components, thereby increasing the dense connection between the internal components of the cured coating and improving adhesion to the aluminum stencil surface. The principle is that the aluminum stencil surface is roller-coated with a coating primarily composed of a highly adhesive epoxy acrylate. After UV curing, a cured layer with strong adhesion to the aluminum stencil surface is formed, thereby protecting the aluminum stencil. Typically, the UV curing process is performed at a light power of 200-300W, at a distance of 10-15cm, and for 5-15 minutes.

[0038] Furthermore, the mass ratio of dehydroabietic acid to C5 petroleum resin in the anticoagulant is (40-60): (30-70). Preferably, the mass ratio of dehydroabietic acid to C5 petroleum resin is 50:50 or 40:60. The C5 petroleum resin also has a good hydrophobic effect in the cured coating.

[0039] Furthermore, in order to better illustrate the effect of the aluminum film plate obtained by the above method, the following is a detailed description through specific examples:

[0040] Example 1

[0041] Preparation of anticoagulant: Heat 50 parts of dehydroabietic acid and 50 parts of C5 petroleum resin to 110°C and melt them, then grind them into fine powder after cooling. The particle size is controlled to be about 100 microns to obtain the anticoagulant.

[0042] Preparation of coating: Start stirring and add 40 parts of polyurethane acrylate, 20 parts of epoxy acrylate, 20 parts of trimethylolpropane triacrylate, 10 parts of adipic acid diacrylate, 3 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 2.5 parts of polydimethylsiloxane, and 3 parts of anticoagulant in sequence by weight at a speed of 400 r / min. Keep stirring at 600 r / min for 30 minutes, then add 10 parts of kaolin at 1000 r / min and stir for one hour, and then disperse at 4000 r / min for 10 minutes to obtain the coating. The whole process should be kept away from light.

[0043] Aluminum film plate coating preparation: Degrease the aluminum template surface, clean it several times and dry it at 80℃; then put the dried aluminum template into the coating equipment production line, and roll-coat the aluminum template with the prepared coating, controlling the coating amount to 8g / m 2 , and perform UV curing treatment, wherein the UV curing power is 200W, the distance is 15cm, and the time is 15min.

[0044] Example 2

[0045] Preparation of anticoagulant: Heat 40 parts of dehydroabietic acid and 60 parts of C5 petroleum resin to 60°C and melt them, then grind them into fine powder after cooling. The particle size is controlled to be about 200 microns to obtain the anticoagulant.

[0046] Preparation of coating: Start stirring and add 35 parts of polyurethane acrylate, 15 parts of epoxy acrylate, 15 parts of trimethylolpropane triacrylate, 15 parts of adipic acid diacrylate, 3.5 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 3 parts of polydimethylsiloxane, and 5 parts of anticoagulant in sequence at a speed of 500 r / min. Keep stirring at 800 r / min for 30 minutes, then add 5 parts of kaolin at 1000 r / min and stir for one hour, and then disperse at 4000 r / min for 10 minutes to obtain the coating. The whole process should be kept away from light.

[0047] Aluminum film plate coating preparation: Degrease the aluminum template surface, clean it several times and dry it at 80℃; then put the dried aluminum template into the coating equipment production line, and roll-coat the aluminum template with the prepared coating, controlling the coating amount to 8g / m 2 , and perform UV curing treatment, wherein the UV curing power is 300W, the distance is 10cm, and the time is 5min.

[0048] Example 3

[0049] Preparation of anticoagulant: Heat 60 parts of dehydroabietic acid and 70 parts of C5 petroleum resin to 150°C and melt them. Grind them into fine powder after cooling. The particle size is controlled to be about 50 microns to obtain the anticoagulant.

[0050] Preparation of coating: Start stirring and add 40 parts of polyurethane acrylate, 10 parts of epoxy acrylate, 25 parts of trimethylolpropane triacrylate, 10 parts of adipic acid diacrylate, 5 parts of 2-hydroxy-2-methyl-1-phenylpropanone, 1 part of polydimethylsiloxane, and 3 parts of anticoagulant in sequence at a speed of 800 r / min. Maintain stirring at a speed of 1000 r / min for 30 minutes, then add 10 parts of kaolin at 1000 r / min and stir for one hour, and then disperse at a speed of 3000 r / min for 20 minutes to obtain the coating. The entire process should be kept away from light.

[0051] Aluminum film plate coating preparation: Degrease the aluminum template surface, clean it several times and dry it at 80℃; then put the dried aluminum template into the coating equipment production line, and roll-coat the aluminum template with the prepared coating, controlling the coating amount to 10g / m 2 , and perform UV curing treatment, wherein the UV curing power is 200W, the distance is 15cm, and the time is 15min.

[0052] Example 4

[0053] Preparation of anticoagulant: Heat 40 parts of dehydroabietic acid and 30 parts of C5 petroleum resin to 150°C and melt them. Grind them into fine powder after cooling. The particle size is controlled to be about 100 microns to obtain the anticoagulant.

[0054] Preparation of coating: Start stirring and add 35 parts of polyurethane acrylate, 15 parts of epoxy acrylate, 20 parts of trimethylolpropane triacrylate, 15 parts of adipic acid diacrylate, 1 part of 2-hydroxy-2-methyl-1-phenylpropanone, 2 parts of polydimethylsiloxane, and 10 parts of anticoagulant in sequence at a speed of 600 r / min. Keep stirring at 400 r / min for 30 minutes, then add 8 parts of kaolin at 800 r / min and stir for one hour, and then disperse at 34000 r / min for 10 minutes to obtain the coating. The whole process should be kept away from light.

[0055] Aluminum film plate coating preparation: Degrease the aluminum template surface, clean it several times and dry it at 80℃; then put the dried aluminum template into the coating equipment production line, and roll-coat the aluminum template with the prepared coating, controlling the coating amount to 10g / m 2 , and perform UV curing treatment, wherein the UV curing power is 250W, the distance is 10cm, and the time is 10min.

[0056] Comparative Example 1

[0057] The same as Example 1, except that during the preparation of the anticoagulant, the particle size of the anticoagulant is controlled to be 300-500 μm.

[0058] Comparative Example 2

[0059] Same as Example 1, no anticoagulant was added to the coating.

[0060] Comparative Example 3

[0061] The same as Example 1, except that the aluminum film plate is not UV-cured.

[0062] Furthermore, the aluminum film plates prepared in Examples 1-4 and Comparative Examples 1-2 were used for concrete mortar formwork, and the surface effects of the formwork were observed after demolding for 15-20 times, as shown in Table 1 below.

[0063] Table 1 - Demolding effect test of examples and comparative examples

[0064]

[0065] As can be seen from the above, in Examples 1-4, the coating of the present invention is used and the aluminum film plate that is easy to release is prepared using the coating, and the aluminum film plate finally obtained can be reused for more than 15 times.

[0066] In Comparative Example 1, the anticoagulant used is 300-500 microns, which is not within the particle size range of the present invention, thereby reducing the effect of the anticoagulant after ultraviolet light curing, thereby affecting the demoulding effect of the aluminum film plate; at the same time, the coating in Comparative Example 2 is directly prepared into the aluminum film plate coating without adding an anticoagulant, and the demoulding effect of the aluminum film plate finally obtained is poor; in Comparative Example 3, although the particle size of the anticoagulant is controlled within the particle size range of the present invention, ultraviolet light curing is not performed, and finally the demoulding effect of the aluminum film plate obtained cannot reach the effect of the present invention.

[0067] It can be seen that in the present invention, an anticoagulant composed of dehydroabietic acid and C5 petroleum resin is used as a modifying additive and added to the coating of the present invention in a corresponding proportion. After UV curing, the carboxyl functional group of the dehydroabietic acid component present on the surface of the formed cured coating has a retarding effect, which can interfere with the formation of Si-O-Si bonds, making it difficult for the concrete surface to cure and adhere to the surface of the aluminum formwork. The carbon ring of the dehydroabietic acid is well compatible with the coating system, thereby increasing the dense connection between the internal parts of the cured coating. In addition, the C5 petroleum resin in the component provides a good hydrophobic effect, thereby enhancing the hydrophobicity of the aluminum formwork surface, and ultimately improving the demoulding effect of the aluminum film plate.

[0068] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0069] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the description and content of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing an easy-to-release aluminum film plate, characterized in that: The method comprises the following steps: Step 1: Degreasing the surface of the aluminum film, and then cleaning and drying it; Step 2, roller coating the dried aluminum film; Step 3, subjecting the aluminum film plate coated with the coating to ultraviolet curing treatment; The coating comprises, by weight, 35 to 40 parts of polyurethane acrylate, 10 to 20 parts of epoxy acrylate, 15 to 25 parts of trimethylolpropane triacrylate, 10 to 15 parts of adipic acid diacrylate, 3 to 10 parts of anticoagulant, 1 to 5 parts of 2-hydroxy-2-methyl-1-phenylacetone, 1 to 3 parts of polydimethylsiloxane, and 5 to 10 parts of filler; The anticoagulant is obtained by heating and melting dehydroabietic acid and C5 petroleum resin in a preset mass ratio at 60-150° C., and grinding the mixture into 50-200 μm fine powder after cooling. The mass ratio of dehydroabietic acid to C5 petroleum resin is (40-60):(30-70).

2. The method for preparing the easy-to-release aluminum film plate according to claim 1, wherein: The preparation method of the coating in step 2 comprises the following steps: In a light-proof environment, start stirring and add preset weight portions of polyurethane acrylate, epoxy acrylate, trimethylolpropane triacrylate, adipic acid diacrylate, anticoagulant, 2-hydroxy-2-methyl-1-phenylpropanone, polydimethylsiloxane and anticoagulant in sequence at a speed of 400-800 r / min, and maintain stirring at a speed of 400-800 r / min for 30-40 minutes; Then add the filler at 600-1000 r / min and stir for one hour, and finally disperse at 3000-4000 r / min for 10-20 minutes.

3. The method for preparing the easy-to-release aluminum film plate according to claim 1, wherein: In step 3, the UV curing light power is 200-300W, the distance is 10-15cm, and the time is 5-15min.

4. The method for preparing an easily demoulding aluminum film sheet according to claim 1, wherein: In step 2, the coating amount is 8-10g / m 2 .

5. The method for preparing the easy-to-release aluminum film plate as claimed in claim 1, characterized in that: The filler includes one of kaolin and talc.

6. An easy-to-release aluminum film plate, characterized in that: The easy-to-release aluminum film plate is prepared by the preparation method of the easy-to-release aluminum film plate according to any one of claims 1 to 5.

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