Recyclable aluminum template and preparation method thereof

Abstract

The invention provides an aluminum template capable of being recycled for multiple times and a preparation method thereof. The aluminum template capable of being recycled for multiple times comprises an aluminum template body, a peelable glue layer is bonded to the aluminum template body, a PET film material layer is fixed outside the peelable glue layer, and the PET film material layer is coated with a UV coating. The preparation method comprises the following steps: S1, carrying out roller coating on the PET film material layer with UV gloss oil, and then carrying out UV curing treatment, so that a UV coating is formed on the PET film material layer; s2, the face, away from the UV coating, of the PET film material layer is coated with peelable glue in a roller coating mode, then drying is conducted, and a peelable glue layer is formed; and S3, the peelable glue layer is attached to the aluminum formwork body, and the aluminum formwork capable of being used repeatedly and circularly is obtained. The problems that an aluminum formwork is prone to damage, short in service life and low in repeated use frequency are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building membrane panels, and in particular relates to an aluminum template that can be recycled and reused multiple times and a preparation method thereof. Background Art

[0002] In construction, building formwork is an indispensable temporary structure. It maintains the correct position during the pouring and hardening of concrete, and bears its own weight and external loads. Building formwork consists of three major parts: the board surface, the supporting structure and the connecting parts. The board surface is used to cover the concrete or steel bars, the supporting structure supports the board surface and keeps it firm and not deformed, and the connecting parts firmly connect the board surface and other supporting structures. Building formwork is usually removed after the concrete structure or component is poured. Their design and material selection must take into account the convenience of operation, durability and cost-effectiveness.

[0003] However, no matter what kind of formwork, concrete often remains on its surface, which affects its use effect and repeated service life. To solve this problem, there are currently the following solutions, such as the use of release agents and spray coatings in the field of aluminum formwork. During on-site construction, the release agent must be manually applied before each use of the aluminum formwork. The traditional release agent will react with the concrete during demolding. The color of the concrete surface after demolding is ugly, and the release agent will fail after dissolving and flowing in water, resulting in sticky slurry and falling corners on the concrete surface, which requires manual repair later. The flow of the release agent will also affect the safety of on-site construction. Workers will accidentally slip when stepping on the release agent, resulting in safety accidents. After the release agent fails, the mold retaining agent will come into direct contact with the concrete. If it exceeds 2-3 times, the mold retaining agent will fail, causing the aluminum formwork to be corroded. The application of traditional release agents causes a waste of manpower and material resources, increases construction costs, and is not conducive to safe construction. However, the release agent is easy to lose during use, which still affects the service life of the aluminum formwork. Although the coating solves the problem of release agent loss, it is inevitably damaged during daily wear with concrete, which also affects the reusability of the aluminum formwork. Summary of the invention

[0004] The invention provides an aluminum template which can be recycled and reused multiple times and a preparation method thereof, which solves the problems that the aluminum template is easy to be damaged, has a short service life and a low number of reusable times.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A recyclable aluminum template comprises an aluminum template body, a peelable adhesive layer is bonded to the aluminum template body, a PET film layer is fixed outside the peelable adhesive layer, and a UV coating is coated outside the PET film layer. The aluminum template body is an aluminum template that is not sprayed with a mold retaining agent, a mold release agent, etc.

[0007] The aluminum template composed of the aluminum template body, the peelable adhesive layer, the PET film layer, and the UV coating can be used repeatedly when applied to building construction. The aluminum template body can also be reused many times. When the UV coating on the PET film layer is damaged, the peelable adhesive layer can be peeled off from the aluminum template body, and a new peelable PET protective film layer (peelable adhesive layer + PET film layer + UV coating) can be pasted to maintain the sustainable use performance of the aluminum template body.

[0008] Preferably, the UV coating is prepared from UV varnish, and the thickness of the UV coating is 15-40 um. The UV coating of the present invention has anti-scratch and anti-fouling properties.

[0009] Preferably, the UV varnish is cured by an excimer lamp. The excimer lamp curing method can form a microstructure on the surface of the UV coating, thereby having a better anti-scratch effect.

[0010] Preferably, the PET film layer is a BOPET film layer, and the thickness of the PET film layer is 30-150um. The PET film layer serves as a bearing film for the peelable adhesive layer and the UV coating, and also serves to protect the aluminum template body. If it is too thin, it is easily damaged under the action of external force, reducing its protective effect. PET is a hard plastic, and if it is too thick, its brittleness is relatively large, and brittle failure is likely to occur during the bonding process. Therefore, the present invention selects BOPET film as the PET film layer, and controls the thickness to be between 30-150um, that is, it is not easy to be damaged and has suitable flexibility, and brittle failure will not occur during the bonding process.

[0011] Preferably, the side of the PET film layer that contacts the UV coating is subjected to corona treatment, which can improve the adhesion between the UV coating and the PET film.

[0012] Preferably, the peelable adhesive layer is a polyurethane peelable adhesive layer or an acrylic peelable adhesive layer.

[0013] Preferably, the adhesive force between the peelable adhesive layer and the aluminum template body is 8-30N / 25cm. If the adhesive force is too small, the adhesion will be weak and the film layer will fall off. If the adhesive force is too large, after the aluminum template body is repeatedly used, it will be difficult to remove the peelable PET protective film from the aluminum template body when it needs to be replaced, and it is easy to leave residual adhesive on the aluminum template body.

[0014] Preferably, the thickness of the peelable adhesive layer is 20-100 um. Further preferably, the thickness of the peelable adhesive layer is 20-50 um. The thickness of the peelable adhesive layer of the present invention is related to the adhesive force. Too thin or too thick will produce the aforementioned adverse effects, that is, too thin will lead to weak adhesion, and too thick will be difficult to detach from the aluminum template body.

[0015] In addition, the increase in thickness of the PET film layer and the peelable adhesive layer of the present invention will also increase the cost.

[0016] As a general inventive concept, the present invention provides a method for preparing an aluminum template that can be recycled and reused multiple times, comprising the following steps:

[0017] S1: Roll-coat UV varnish on the PET film layer, and then perform UV curing treatment to form a UV coating on the PET film layer;

[0018] S2: Roll-coat the peelable adhesive on the side of the PET film layer facing away from the UV coating, and then dry it to form a peelable adhesive layer;

[0019] S3: Laminating the peelable adhesive layer onto the aluminum template body to obtain an aluminum template that can be recycled and reused multiple times.

[0020] Preferably, between step S2 and step S3, the following steps are further included: covering the peelable adhesive layer with a release protective film; before pasting the peelable adhesive layer to the aluminum template body, tearing off the release protective film;

[0021] The release protective film has a thickness of 10-50 um, and the adhesive force between the peelable adhesive layer and the release protective film is 2-5 N / 25 cm.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The aluminum template of the present invention can be recycled and reused many times. It is not necessary to pre-treat the aluminum template body. The peelable PET protective film layer (peelable adhesive layer + PET film layer + UV coating) can be directly pasted. After pasting the peelable PET protective film layer, the aluminum template body, wherein the UV coating has an excellent demoulding effect, and the cooperation of each layer can form a protection for the aluminum template body to prevent the aluminum template body from being corroded. After the UV coating is damaged, the peelable adhesive layer can be peeled off from the aluminum template body, and a new peelable PET protective film can be pasted. The aluminum template body can also be pasted with the peelable PET protective film layer again for use, that is, the template body can be reused many times.

[0024] 2. The aluminum template with a peelable PET protective film layer can achieve the effect of using coating protection alone, and the aluminum template can be reused many times, with a single service life of more than 30 cycles, and the overall service life of the aluminum film plate is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 Schematic diagram of the structure of the aluminum template that can be recycled multiple times in the embodiment.

[0027] In the figure: 1. Aluminum template body; 2. Peelable adhesive layer; 3. PET film layer; 4. UV coating. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0029] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0031] Embodiment 1:

[0032] An aluminum template that can be recycled and reused multiple times, such as Figure 1 As shown, it comprises an aluminum template body 1 , a peelable adhesive layer 2 is bonded to the aluminum template body 1 , a PET film layer 3 is fixed outside the peelable adhesive layer 2 , and a UV coating 4 is coated outside the PET film layer 3 .

[0033] The UV coating 4 is prepared from UV varnish; the thickness of the UV coating 4 is 25 um.

[0034] The PET film layer 3 is a BOPET film layer, and the thickness of the PET film layer 3 is 100 um. The side of the PET film layer 3 contacting the UV coating 4 is subjected to corona treatment.

[0035] The peelable adhesive layer 2 is a polyurethane peelable adhesive layer; the bonding force between the peelable adhesive layer 2 and the aluminum template body 1 is 20N / 25cm; the thickness of the peelable adhesive layer 2 is 45um; the polyurethane peelable adhesive layer is prepared from polyurethane peelable adhesive.

[0036] The method for preparing the aluminum template that can be recycled and reused in this embodiment comprises the following steps:

[0037] S1: Roll-coat UV varnish on the PET film layer 3, and then use an excimer lamp to cure it, so that a UV coating 4 is formed on the PET film layer 3;

[0038] S2: Roll-coating a polyurethane peelable adhesive on the side of the PET film layer 3 facing away from the UV coating 4, and then drying the roll to form a peelable adhesive layer 2;

[0039] S3: Laminating the peelable adhesive layer 2 onto the aluminum template body 1 to obtain an aluminum template that can be recycled and reused multiple times.

[0040] Embodiment 2:

[0041] An aluminum formwork that can be recycled and reused multiple times, such as Figure 1 As shown, it comprises an aluminum template body 1 , a peelable adhesive layer 2 is bonded to the aluminum template body 1 , a PET film layer 3 is fixed outside the peelable adhesive layer 2 , and a UV coating 4 is coated outside the PET film layer 3 .

[0042] The UV coating 4 is prepared from UV varnish, and the thickness of the UV coating 4 is 23 um.

[0043] The PET film layer 3 is a BOPET film layer, and the thickness of the PET film layer 3 is 70 um. The side of the PET film layer 3 that contacts the UV coating 4 is subjected to corona treatment.

[0044] The peelable adhesive layer 2 is an acrylic peelable adhesive layer; the adhesive force between the peelable adhesive layer 2 and the aluminum template body 1 is 25N / 25cm. The peelable adhesive layer 2 has a thickness of 50um; the acrylic peelable adhesive layer is prepared from acrylic peelable adhesive.

[0045] The method for preparing the aluminum template that can be recycled and reused in this embodiment comprises the following steps:

[0046] S1: Roll-coat UV varnish on the PET film layer 3, and then use an excimer lamp to cure it, so that a UV coating 4 is formed on the PET film layer 3;

[0047] S2: Roll-coat the side of the PET film layer 3 facing away from the UV coating 4 with acrylic peelable adhesive, and then dry it to form a peelable adhesive layer 2;

[0048] S3: Laminating the peelable adhesive layer 2 onto the aluminum template body 1 to obtain an aluminum template that can be recycled and reused multiple times.

[0049] Embodiment 3:

[0050] An aluminum formwork that can be recycled and reused multiple times, such as Figure 1 As shown, it comprises an aluminum template body 1 , a peelable adhesive layer 2 is bonded to the aluminum template body 1 , a PET film layer 3 is fixed outside the peelable adhesive layer 2 , and a UV coating 4 is coated outside the PET film layer 3 .

[0051] The UV coating 4 is prepared from UV varnish, and the thickness of the UV coating 4 is 25 um.

[0052] The PET film layer 3 is a BOPET film layer, and the thickness of the PET film layer 3 is 100 um. The side of the PET film layer 3 contacting the UV coating 4 is subjected to corona treatment.

[0053] The peelable adhesive layer 2 is a polyurethane peelable adhesive layer, and the bonding force between the peelable adhesive layer 2 and the aluminum template body 1 is 16N / 25cm. The peelable adhesive layer 2 has a thickness of 35um; the polyurethane peelable adhesive layer is prepared from polyurethane peelable adhesive.

[0054] The method for preparing the aluminum template that can be recycled and reused in this embodiment comprises the following steps:

[0055] S1: Roll-coat UV varnish on the PET film layer 3, and then use an excimer lamp to cure it, so that a UV coating 4 is formed on the PET film layer 3;

[0056] S2: Roll-coat the side of the PET film material layer 3 away from the UV coating 4 with a polyurethane peelable adhesive, and then dry it to form a peelable adhesive layer 2; cover the peelable adhesive layer 2 with a PE release protective film; and roll it by hand to obtain a rolled film material;

[0057] Before the peelable adhesive layer 2 is pasted to the aluminum template body 1, the PE release protective film is torn off; the bonding force between the peelable adhesive layer 2 and the centrifugal membrane is 3N / 25cm.

[0058] S3: Laminating the peelable adhesive layer 2 onto the aluminum template body 1 to obtain an aluminum template that can be recycled and reused multiple times.

[0059] Comparative Example 1:

[0060] An aluminum formwork that can be used repeatedly, such as Figure 1 As shown, it comprises an aluminum template body 1 , a peelable adhesive layer 2 is bonded to the aluminum template body 1 , a PET film layer 3 is fixed outside the peelable adhesive layer 2 , and a UV coating 4 is coated outside the PET film layer 3 .

[0061] The UV coating 4 is prepared from UV varnish, and the thickness of the UV coating 4 is 25 um.

[0062] The PET film layer 3 is a BOPET film layer, and the thickness of the PET film layer 3 is 100 um. The side of the PET film layer 3 contacting the UV coating 4 is subjected to corona treatment.

[0063] The peelable adhesive layer 2 is a polyurethane peelable adhesive layer, and the bonding force between the peelable adhesive layer 2 and the aluminum template body 1 is 6N / 25cm. The peelable adhesive layer 2 has a thickness of 15um; the polyurethane peelable adhesive layer is prepared from polyurethane peelable adhesive.

[0064] The preparation method of the aluminum template that can be recycled and reused multiple times in this comparative example is the same as that in Example 1.

[0065] Comparative Example 2:

[0066] The utility model relates to an aluminum formwork for construction, comprising an aluminum formwork and a UV coating coated on the aluminum formwork.

[0067] The preparation method of the aluminum formwork for construction in this comparative example comprises the following steps:

[0068] The aluminum template is sprayed with UV varnish, and then cured with an excimer lamp to form a UV coating on the aluminum template to obtain an aluminum template for construction.

[0069] Performance Test:

[0070] The appearance of the aluminum templates in Examples 1-3 and Comparative Examples 1-2 after being recycled for 30 times and the difficulty of recycling the aluminum templates were tested. The specific test results are shown in Table 1.

[0071] Table 1:

[0072]

[0073]

[0074] As can be seen from Table 1, the aluminum templates of Examples 1-3 pasted with the peelable PET protective film layer (peelable adhesive layer 2 + PET film layer 3 + UV coating 4) of the present invention have good protection effects. After 30 cycles of use, the UV coating is only partially worn, that is, the number of cycles is more than 30. If the peelable adhesive layer 2 is thinner, the bonding force is weaker, such as in Comparative Example 1, the number of cycles of the aluminum template pasted with the peelable PET protective film layer is reduced. After 20 uses, the protective film layer is partially peeled off and mortar is stuck. In Comparative Example 2, the UV coating is directly applied to the aluminum template. After the coating is partially worn, it needs to be melted before it can be used again.

[0075] The above combined with the accompanying drawings are preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, changes, improvements and modifications to these embodiments should be considered as the protection scope of the present invention.

Claims

1. An aluminum template that can be recycled and reused multiple times, characterized in that: The aluminum template that can be recycled and reused multiple times comprises an aluminum template body (1), a peelable adhesive layer (2) is bonded to the aluminum template body (1), a PET film layer (3) is fixed outside the peelable adhesive layer (2), and the PET film layer (3) is coated with a UV coating (4) outside.

2. The recyclable aluminum formwork according to claim 1 is characterized in that: The UV coating (4) is prepared from UV varnish, and the thickness of the UV coating (4) is 15-40 um.

3. The recyclable aluminum formwork according to claim 2 is characterized in that: The UV varnish is cured by an excimer lamp.

4. The recyclable aluminum formwork according to claim 1 is characterized in that: The PET film material layer (3) is a BOPET film material layer, and the thickness of the PET film material layer (3) is 30-150 um.

5. The recyclable aluminum formwork according to claim 1 is characterized in that: The side of the PET film layer (3) in contact with the UV coating (4) is subjected to corona treatment.

6. The recyclable aluminum formwork according to claim 1 is characterized in that: The peelable adhesive layer (2) is a polyurethane peelable adhesive layer or an acrylic peelable adhesive layer.

7. The recyclable aluminum formwork according to claim 1 is characterized in that: The bonding force between the peelable adhesive layer (2) and the aluminum template body (1) is 8-30N / 25cm.

8. The recyclable aluminum formwork according to claim 1, characterized in that: The thickness of the peelable adhesive layer (2) is 20-50 um.

9. A method for preparing a recyclable aluminum template as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Roll-coating UV varnish on the PET film layer (3), and then UV curing, so that a UV coating (4) is formed on the PET film layer (3); S2: Roll-coating a peelable adhesive on the side of the PET film layer (3) facing away from the UV coating (4), and then drying the roll to form a peelable adhesive layer (2); S3: Laminating the peelable adhesive layer (2) onto the aluminum template body (1) to obtain an aluminum template that can be recycled and reused multiple times.

10. The preparation method according to claim 9, characterized in that: Between step S2 and step S3, the following steps are also included: covering the peelable adhesive layer (2) with a release protective film; before sticking the peelable adhesive layer (2) to the aluminum template body (1), tearing off the release protective film; The release protective film has a thickness of 10-50 um, and the adhesive force between the peelable adhesive layer (2) and the release protective film is 2-5 N / 25 cm.

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