A method for forming a wood grain pattern on the surface of an aluminum alloy profile and an aluminum alloy profile

Abstract

The present invention discloses a method for forming a wood grain pattern on the surface of an aluminum alloy profile, which comprises the following operating steps: Step 1: Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment; Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, perform magnetron sputtering with a silicon dioxide target to form a silicon dioxide layer in the pores of the anodic oxidation layer, place the sputtered aluminum alloy profile back into the anodic oxidation tank for soaking treatment, and then use a silane coupling agent for surface treatment after soaking; Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing; Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable sleeve outside the wood grain film, bake it for heat transfer printing, and remove the heat shrinkable sleeve and the wood grain film after the transfer printing is completed. The present invention also discloses an aluminum profile prepared by the above method. This technical solution effectively improves the bonding strength of the wood grain pattern and extends the service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal surface treatment, and particularly relates to a method for forming a wood grain pattern on the surface of an aluminum alloy profile and an aluminum alloy profile. Background Art

[0002] Aluminum profiles have strong corrosion resistance, non-ferromagnetism, formability and recyclability, so they are widely used in daily production and life. With the improvement of people's requirements for product packaging and decoration, the production requirements of aluminum profiles have also increased accordingly. Most people like a living environment close to nature, but using wood for decoration has low practicability and is prone to erosion and decay, and high-grade wood is expensive.

[0003] In order to meet the market needs, various wood grain prints are required on the surface of existing aluminum alloy profiles, which avoids secondary treatment during decoration and meets people's needs. However, existing wood grain aluminum alloy profiles have certain service life problems, mainly due to the bonding strength between the wood grain pattern on their surface and the aluminum alloy. Existing technologies mainly form an anodic oxidation layer on the surface of the aluminum alloy to improve the bonding strength between the wood grain pattern and the aluminum alloy, but the bonding strength between the wood grain pattern itself and the anodic oxidation layer is not high, and at the same time, the wood grain pattern is easily scratched and peeled off by the outside. Summary of the Invention

[0004] In view of the above existing technical problems, the present invention provides a method for forming a wood grain pattern on the surface of an aluminum alloy profile and an aluminum alloy profile to solve the problem of insufficient wear resistance of the imitation wood grain pattern of existing aluminum alloy profiles. The method for forming a wood grain pattern on the surface of the aluminum alloy profile and the aluminum alloy profile can effectively improve the bonding strength of the wood grain pattern and improve the service life.

[0005] The present invention provides a method for forming a wood grain pattern on the surface of an aluminum alloy profile, including the following operating steps:

[0006] Step 1: Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains acid solution or alkali solution, and a porous anodic oxidation layer is formed on the surface of the aluminum alloy profile.

[0007] Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, wash and dry it, perform magnetron sputtering with a silicon dioxide target to form a silicon dioxide layer in the pores of the anodic oxidation layer, place the sputtered aluminum alloy profile back into the anodic oxidation tank for soaking treatment, and then perform surface treatment with a silane coupling agent after soaking.

[0008] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing.

[0009] Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable tube outside the wood grain film, bake for thermal transfer printing, and remove the heat shrinkable tube and the wood grain film after the transfer printing is completed.

[0010] Further, before the anodizing treatment, the aluminum alloy profile is cleaned and degreased, and then the aluminum alloy profile is subjected to alkaline etching treatment.

[0011] Further, after the alkaline etching treatment, the surface of the aluminum alloy profile is polished.

[0012] Further, during the magnetron sputtering process, the vacuum degree is controlled to be 0.9 - 1.3×10-4 Pa, the power is 50 - 70 W, and the protective gas is argon.

[0013] Further, the silane coupling agent is selected from amino silane coupling agents or epoxy silane coupling agents.

[0014] Further, the amino silane coupling agent is selected from N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and the epoxy silane coupling agent is selected from γ-glycidoxypropyltributoxysilane.

[0015] Further, the thermal transfer printing process is carried out under vacuum conditions, and ultrasonic treatment is applied to the aluminum alloy profile at the same time.

[0016] Further, the thermal transfer printing process controls the vacuum degree to be 0.2 - 0.5 and the temperature to be 147°C - 167°C

[0017] The present invention also provides an aluminum alloy profile prepared by the method as described above.

[0018] According to the method for forming a wood grain pattern on the surface of an aluminum alloy profile provided by the present invention, a PVDF fluorocarbon powder is used to form the bottom layer of the transferred wood grain, which has good bonding strength with the transferred wood grain. At the same time, in order to improve the bonding strength between the PVDF fluorocarbon powder after melting and the anodized layer, a silicon dioxide layer is deposited on the surface of the holes in the anodized layer by magnetron sputtering. At the same time, the silicon dioxide layer is treated with an acid solution or an alkaline solution in the anodizing tank, so that the silicon dioxide layer has silanol groups, which is conducive to the hydrolysis and condensation combination with the silane coupling agent, improving the affinity with the PVDF fluorocarbon powder, thereby obtaining a highly stable wood grain pattern, effectively avoiding the shedding of the wood grain pattern and extending the service life. Specific Embodiments

[0019] The technical solutions in the present invention will be clearly and completely described below. Obviously, the described ones are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The present invention provides a method for forming a wood grain pattern on the surface of an aluminum alloy profile, including the following operation steps:

[0021] Step 1: Place the aluminum alloy profile in an anodizing tank for anodizing treatment. The anodizing tank contains acid solution or alkali solution, and a porous anodic oxide layer is formed on the surface of the aluminum alloy profile.

[0022] Step 2: Take out the aluminum alloy profile from the anodizing tank, clean and dry it, perform magnetron sputtering with a silicon dioxide target to form a silicon dioxide layer in the pores of the anodic oxide layer, place the sputtered aluminum alloy profile back into the anodizing tank for immersion treatment, and then perform surface treatment with a silane coupling agent after immersion.

[0023] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing.

[0024] Step 4: Cover a wood grain film on the surface of the aluminum alloy profile, put a heat shrinkable tube outside the wood grain film, bake it for thermal transfer printing, and remove the heat shrinkable tube and the wood grain film after the transfer printing is completed.

[0025] According to the method for forming a wood grain pattern on the surface of an aluminum alloy profile provided by the present invention, PVDF fluorocarbon powder is used to form the bottom layer of the transferred wood grain, which has good bonding strength with the transferred wood grain. At the same time, in order to improve the bonding strength between the PVDF fluorocarbon powder after melting and the anodic oxide layer, a silicon dioxide layer is deposited on the surface of the pores of the anodic oxide layer by magnetron sputtering. At the same time, the silicon dioxide layer is treated with the acid solution or alkali solution in the anodizing tank to make the silicon dioxide layer carry silanol groups, which is conducive to hydrolysis condensation bonding with the silane coupling agent, improving the affinity with the PVDF fluorocarbon powder, thereby obtaining a wood grain pattern with high stability, effectively avoiding the shedding of the wood grain pattern and prolonging the service life.

[0026] In one embodiment, before the anodizing treatment, the aluminum alloy profile is cleaned and degreased, and then alkali etching treatment is performed on the aluminum alloy profile.

[0027] In one embodiment, after the alkali etching treatment, the surface of the aluminum alloy profile is polished.

[0028] In one embodiment, during the magnetron sputtering process, the vacuum degree is controlled to be 0.9 - 1.3×10-4 Pa, the power is 50 - 70 W, and the protective gas is argon.

[0029] In one embodiment, the silane coupling agent is selected from an amino-silane coupling agent or an epoxy-silane coupling agent.

[0030] In one embodiment, the amino-silane coupling agent is selected from N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and the epoxy-silane coupling agent is selected from γ-glycidoxypropyltributoxysilane.

[0031] In one embodiment, the thermal transfer process is carried out under vacuum conditions, and ultrasonic treatment is applied to the aluminum alloy profile simultaneously.

[0032] The heat shrinkable tube can produce a tightening and pressing effect on the wood grain film under heating conditions, which is beneficial to pressing the transfer pattern on the wood grain film onto the aluminum alloy profile. Through the action of the vacuum conditions, it is beneficial to remove the bubbles in the heat shrinkable tube. At the same time, the PVDF fluorocarbon powder will soften during the thermal transfer process. Applying ultrasonic treatment to the aluminum alloy profile is beneficial to the penetration of the thermal transfer pattern into the PVDF fluorocarbon powder layer and improves the bonding strength.

[0033] In one embodiment, the vacuum degree is controlled to be 0.2 - 0.5 and the temperature is 147°C - 167°C during the thermal transfer process.

[0034] The present invention also provides an aluminum alloy profile prepared by the method as described above.

[0035] The present invention is further explained through specific embodiments as follows: Example 1

[0036] Step 1: Clean and degrease the aluminum alloy profile, and then perform alkaline etching on the aluminum alloy profile. After the alkaline etching treatment, polish the surface of the aluminum alloy profile. Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains an acidic solution, and a porous anodic oxidation layer is formed on the surface of the aluminum alloy profile;

[0037] Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, perform magnetron sputtering using a silicon dioxide target, control the vacuum degree to be 1.1×10-4 Pa, the power to be 60 W, and the protective gas to be argon to form a silicon dioxide layer in the pores of the anodic oxidation layer. Place the sputtered aluminum alloy profile back into the anodic oxidation tank for soaking treatment, and then perform surface treatment with a silane coupling agent after soaking;

[0038] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing;

[0039] Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable tube outside the wood grain film, apply ultrasonic treatment to the aluminum alloy profile, bake for thermal transfer printing, and control the vacuum degree to be 0.3 and the temperature to be 165°C.

[0040] After the transfer printing is completed, remove the heat shrinkable tube and the wood grain film. Example 2

[0041] Step 1: Clean and degrease the aluminum alloy profile, and then perform alkaline etching treatment on the aluminum alloy profile. After the alkaline etching treatment, polish the surface of the aluminum alloy profile. Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains acid solution, and a porous anodic oxidation layer is formed on the surface of the aluminum alloy profile;

[0042] Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, perform magnetron sputtering with a silicon dioxide target, control the vacuum degree to be 1.1×10-4 Pa, the power to be 60 W, and the protective gas to be argon, form a silicon dioxide layer in the pores of the anodic oxidation layer, place the sputtered aluminum alloy profile back into the anodic oxidation tank for immersion treatment, and perform surface treatment with a silane coupling agent after immersion;

[0043] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing;

[0044] Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable tube outside the wood grain film, bake for thermal transfer printing, and control the vacuum degree to be 0.3 and the temperature to be 165°C.

[0045] After the transfer printing is completed, remove the heat shrinkable tube and the wood grain film.

[0046] Comparative Example 1

[0047] Step 1: Clean and degrease the aluminum alloy profile, and then perform alkaline etching treatment on the aluminum alloy profile. After the alkaline etching treatment, polish the surface of the aluminum alloy profile. Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains acid solution, and a porous anodic oxidation layer is formed on the surface of the aluminum alloy profile;

[0048] Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, and perform surface treatment with a silane coupling agent;

[0049] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing;

[0050] Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable tube outside the wood grain film, apply ultrasonic treatment to the aluminum alloy profile, bake for thermal transfer printing, and control the vacuum degree to be 0.3 and the temperature to be 165°C.

[0051] After the transfer is completed, remove the heat-shrinkable sleeve and the wood grain film.

[0052] Comparative Example 2

[0053] Step 1: Clean and degrease the aluminum alloy profile, and then perform alkaline etching on the aluminum alloy profile. After the alkaline etching treatment, polish the surface of the aluminum alloy profile. Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains an acid solution, and a porous anodic oxidation layer is formed on the surface of the aluminum alloy profile;

[0054] Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, perform magnetron sputtering with a silica target, control the vacuum degree to be 1.1×10-4 Pa, the power to be 60 W, and the protective gas to be argon, form a silica layer in the pores of the anodic oxidation layer, and perform surface treatment with a silane coupling agent;

[0055] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing;

[0056] Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat-shrinkable sleeve outside the wood grain film, apply ultrasonic treatment to the aluminum alloy profile, perform thermal transfer by baking, and control the vacuum degree to be 0.3 and the temperature to be 165 °C.

[0057] After the transfer is completed, remove the heat-shrinkable sleeve and the wood grain film.

[0058] Comparative Example 3

[0059] Step 1: Clean and degrease the aluminum alloy profile, and then perform alkaline etching on the aluminum alloy profile. After the alkaline etching treatment, polish the surface of the aluminum alloy profile. Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains an acid solution, and a porous anodic oxidation layer is formed on the surface of the aluminum alloy profile;

[0060] Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, perform magnetron sputtering with a silica target, control the vacuum degree to be 1.1×10-4 Pa, the power to be 60 W, and the protective gas to be argon, form a silica layer in the pores of the anodic oxidation layer, place the sputtered aluminum alloy profile back into the anodic oxidation tank for immersion treatment, and clean and dry it after immersion;

[0061] Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing;

[0062] Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable tube outside the wood grain film, apply ultrasonic treatment to the aluminum alloy profile, and bake for thermal transfer. Control the vacuum degree at 0.3 and the temperature at 165 °C.

[0063] After the transfer is completed, remove the heat shrinkable tube and the wood grain film.

[0064] Result test

[0065] Cut the aluminum profiles prepared in the above examples and comparative examples into multiple test pieces, use compressed air to accelerate the spraying of silicon carbide abrasive onto the surface of the test pieces, and record the time when the wood grain pattern appears worn. The test results are shown in the following table:

[0066]

[0067] It can be seen from the test data in the above table that compared with the existing wood grain formation method, the method for forming a wood grain pattern on the surface of the aluminum alloy profile provided by the present invention can effectively improve the bonding strength of the wood grain pattern and extend its service life.

[0068] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for forming a wood grain pattern on the surface of an aluminum alloy profile, characterized in that, It includes the following operation steps: Step 1: Place the aluminum alloy profile in an anodic oxidation tank for anodic oxidation treatment. The anodic oxidation tank contains acid solution or alkali solution to form a porous anodic oxidation layer on the surface of the aluminum alloy profile; Step 2: Take out the aluminum alloy profile from the anodic oxidation tank, clean and dry it, perform magnetron sputtering with a silicon dioxide target to form a silicon dioxide layer in the pores of the anodic oxidation layer, place the sputtered aluminum alloy profile back into the anodic oxidation tank for soaking treatment, and then perform surface treatment with a silane coupling agent after soaking; Step 3: Spray PVDF fluorocarbon powder on the surface of the aluminum alloy profile and bake it for curing; Step 4: Cover the surface of the aluminum alloy profile with a wood grain film, put a heat shrinkable sleeve outside the wood grain film, bake for heat transfer printing, and remove the heat shrinkable sleeve and the wood grain film after the transfer printing is completed.

2. A method for forming a wood grain pattern on the surface of an aluminum alloy profile according to claim 1, characterized in that, Before the anodic oxidation treatment, the aluminum alloy profile is cleaned and degreased, and then alkali etching treatment is carried out on the aluminum alloy profile.

3. A method for forming a wood grain pattern on the surface of an aluminum alloy profile according to claim 2, characterized in that, After the alkali etching treatment, the surface of the aluminum alloy profile is polished.

4. A method for forming a wood grain pattern on the surface of an aluminum alloy profile according to claim 1, characterized in that, During the magnetron sputtering process, the vacuum degree is controlled to be 0.9 - 1.3×10 -4 Pa, the power is 50 - 70 W, and the protective gas is argon.

5. A method for forming a wood grain pattern on the surface of an aluminum alloy profile according to claim 1, characterized in that, The silane coupling agent is selected from amino silane coupling agent or epoxy silane coupling agent.

6. A method for forming a wood grain pattern on the surface of an aluminum alloy profile according to claim 1, characterized in that, The heat transfer printing process is carried out under vacuum conditions, and ultrasonic treatment is applied to the aluminum alloy profile at the same time.

7. An aluminum alloy profile, characterized in that, Prepared by the method according to any one of claims 1-6.

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