Replaceable magnetic suction silica gel heat transfer printing trademark and preparation method thereof

Abstract

The invention relates to the technical field of transfer printing trademarks, and discloses a replaceable magnetic suction silica gel heat transfer printing trademark and a preparation method thereof.The preparation method comprises the following steps that surface roughening treatment is conducted on a neodymium iron boron solid magnet; mixing the platinum catalytic addition type liquid silica gel with a silane coupling agent; gradient heating vulcanization is carried out; a hot melt adhesive film is attached to the surface of the silica gel composite layer; according to the replaceable magnetic suction silica gel heat transfer printing trademark and the preparation method thereof, flexible integration of a magnetic suction function and pattern customization is achieved through a sandwich type composite structure, a user can freely replace the trademark theme through magnetic suction, and the social contact and collection requirements of the Z generation are met; and meanwhile, gradient vulcanization and nitrogen protection are adopted, the vulcanization temperature is controlled within the tolerance range of the magnet, and demagnetization is avoided in combination with the epoxy resin coating.

Description

Technical Field

[0001] The present invention relates to the technical field of transfer trademarks, and in particular to a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof. Background Art

[0002] Cultural and creative products, as the name suggests, refer to cultural and creative products. These are high-value-added products created and enhanced through the development and utilization of intellectual property rights, leveraging the wisdom, skills, and talents of creative individuals, the creation and enhancement of cultural resources and cultural products through modern technology. Innovation and creativity are at the core of cultural and creative product development, while intellectual property protection is the lifeblood of these products. Innovation and creativity allow products to carry culture, connect culture with the market, and achieve both economic and social benefits. While innovation and creativity are the most valuable, they are also the most vulnerable.

[0003] Traditional cultural and creative trademarks (such as metal badges and offset printing patterns) have the following problems: single function, fixed and non-replaceable patterns, and inability to meet users' personalized matching needs; insufficient stability, with metal pins easily damaging clothing and viscose trademarks having poor washability; process limitations, with magnets easily demagnetized during high-temperature vulcanization, and low interfacial bonding strength between magnets and silicone, resulting in a short product lifespan. In existing technologies, the combination of magnetic attraction and thermal transfer technology faces technical bottlenecks such as temperature sensitivity (the operating temperature of neodymium iron boron magnets is ≤80°C, while silicone vulcanization requires 120-180°C), interfacial debonding, and the formation of a weak bonding layer between the liquid silicone and the magnet surface after curing, making industrial mass production difficult;

[0004] In view of this, we propose a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof, comprising the following steps:

[0007] S1. Surface roughening treatment is performed on the NdFeB solid magnet, with a roughness of Ra ≥ 3.2 μm, followed by spraying a 0.1 mm thick high-temperature resistant epoxy resin layer with a temperature resistance of ≥ 200°C;

[0008] S2, mixing platinum catalyzed addition type liquid silicone with silane coupling agent, adding pre-treated solid magnet, and forming a silicone-magnet composite layer by vacuum degassing process, with the residual bubble content ≤0.1%;

[0009] S3, perform gradient temperature vulcanization, first vulcanize at 120℃ for 30min, then increase the temperature to 180℃ for 15min, and the vulcanization process is carried out under nitrogen protection environment;

[0010] S4, laminating a hot melt adhesive film on the surface of the silicone composite layer and forming a sandwich structure by hot pressing;

[0011] S5. Use rotary magnetizing fixture combined with finite element simulation to perform post-magnetization treatment to ensure that the surface magnetic induction intensity is ≥0.3T.

[0012] Optionally, the solid magnet is an N38-N45 neodymium iron boron magnet with a surface nickel plating layer thickness of ≥5 μm and a dimensional accuracy of ±0.1 mm.

[0013] Optionally, the liquid silicone is LSR liquid silicone with a hardness of ShoreA30-50, a tensile strength ≥8MPa, and a temperature resistance range of -40°C to 120°C.

[0014] Optionally, the solid magnet is an N38-N45 neodymium iron boron magnet with a surface nickel plating layer thickness of ≥5 μm and a dimensional accuracy of ±0.1 mm.

[0015] Optionally, the silane coupling agent is KH-550 or KH-570, and the added amount is 1-3 wt% of the mass of the liquid silicone.

[0016] Optionally, the hot melt adhesive film is made of EVA or TPU, and the hot pressing molding temperature is 150-180° C., the pressure is 0.5-1 MPa, and the time is 10-20 seconds.

[0017] Optionally, the thermal transfer lamination temperature is 180-200°C, the time is 15-18 seconds, and the lamination yield is ≥98%.

[0018] Optionally, the pressure of the vacuum degassing process is ≤-0.08MPa, and the degassing time is 10-15min; the tear strength of the product is ≥15MPa, the number of reuses is ≥5 times, and the magnetic attraction force is ≥2N.

[0019] Compared with the prior art, the present invention provides a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof, which has the following beneficial effects:

[0020] 1. This replaceable magnetic silicone thermal transfer trademark and its preparation method achieve the flexible integration of "magnetic function + pattern customization" through a sandwich composite structure. Users can freely change the trademark theme through magnetic attraction, meeting the social and collection needs of Generation Z. At the same time, gradient vulcanization + nitrogen protection is used to control the vulcanization temperature within the tolerance range of the magnet, where the tolerance range is 120-180°C. Combined with epoxy resin coating, demagnetization is avoided, and the demagnetization rate is reduced by more than 60% compared with traditional processes. Surface roughening + coupling agent treatment enhances the magnet-silicone interface bonding strength, and no delamination or shedding occurs after a 48-hour salt spray test.

[0021] 2. This replaceable magnetic silicone heat transfer trademark and its preparation method replace metal pins and disposable offset printing, can be reused more than 5 times, and is in line with the trend of sustainable consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the process structure of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1:

[0025] like Figure 1 As shown, the present invention provides a technical solution: a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof, comprising the following steps:

[0026] S1. Surface roughening treatment is performed on the NdFeB solid magnet, with a roughness of Ra ≥ 3.2 μm, followed by spraying a 0.1 mm thick high-temperature resistant epoxy resin layer with a temperature resistance of ≥ 200°C;

[0027] S2, mixing platinum catalyzed addition type liquid silicone with silane coupling agent, adding pre-treated solid magnet, and forming a silicone-magnet composite layer by vacuum degassing process, with the residual bubble content ≤0.1%;

[0028] S3, perform gradient temperature vulcanization, first vulcanize at 120℃ for 30min, then increase the temperature to 180℃ for 15min, and the vulcanization process is carried out under nitrogen protection environment;

[0029] S4, laminating a hot melt adhesive film on the surface of the silicone composite layer and forming a sandwich structure by hot pressing;

[0030] S5. Use rotary magnetizing fixture combined with finite element simulation to perform post-magnetization treatment to ensure that the surface magnetic induction intensity is ≥0.3T.

[0031] The solid magnets are N38-N45 NdFeB magnets with a nickel plating thickness of 5μm or greater and a dimensional accuracy of ±0.1mm. The liquid silicone rubber is LSR with a hardness of Shore A30-50, a tensile strength of 8MPa or greater, and a temperature resistance range of -40°C to 100°C. The solid magnets are N38-N45 NdFeB magnets with a nickel plating thickness of 5μm or greater and a dimensional accuracy of ±0.1mm. The silane coupling agent is KH-550 or KH-570, added at a level of 1-3wt% of the liquid silicone rubber.

[0032] It is worth noting that the hot melt adhesive film is made of EVA or TPU, and the hot pressing temperature is 150-180℃, the pressure is 0.5-1MPa, and the time is 10-20s. The thermal transfer lamination temperature is 185-200℃, the time is 15 seconds, and the lamination yield is ≥98%.

[0033] In addition, the pressure of the vacuum degassing process is ≤-0.08MPa, and the degassing time is 10-15min; the product's tear strength is ≥15MPa, the number of reuses is ≥5 times, and the magnetic attraction force is ≥2N.

[0034] The replaceable magnetic silicone thermal transfer trademark in this embodiment includes a sandwich composite structure, which includes a bottom layer (silicone base), a middle layer (magnetic layer) and a surface layer (hot melt adhesive layer);

[0035] Among them, the bottom layer is made of LSR liquid silicone, which provides flexibility and support, with a hardness of ShoreA30-50 and a temperature resistance of -40℃~120℃; the middle layer is embedded with NdFeB solid magnets, the surface is roughened and coated, the magnetic attraction force is ≥2N, and the surface magnetic induction intensity is ≥0.3T; the surface layer is a hot-melt adhesive film (such as EVA or TPU), and the pattern is thermally transferred through hot pressing molding, and the thermal transfer bonding yield is ≥98%.

[0036] Example 2:

[0037] like Figure 1 As shown, the present invention provides a technical solution: a replaceable magnetic silicone thermal transfer trademark and a preparation method thereof, comprising the following steps:

[0038] S1. Surface roughening treatment is performed on the NdFeB solid magnet, with a roughness of Ra ≥ 3.2 μm, followed by spraying a 0.1 mm thick high-temperature resistant epoxy resin layer with a temperature resistance of ≥ 200°C;

[0039] S2, mixing platinum catalyzed addition type liquid silicone with silane coupling agent, adding pre-treated solid magnet, and forming a silicone-magnet composite layer by vacuum degassing process, with the residual bubble content ≤0.1%;

[0040] S3, perform gradient temperature vulcanization, first vulcanize at 120℃ for 30min, then increase the temperature to 180℃ for 15min, and the vulcanization process is carried out under nitrogen protection environment;

[0041] S4, laminating a hot melt adhesive film on the surface of the silicone composite layer and forming a sandwich structure by hot pressing;

[0042] S5. Use rotary magnetizing fixture combined with finite element simulation to perform post-magnetization treatment to ensure that the surface magnetic induction intensity is ≥0.3T.

[0043] The solid magnets are N38-N45 NdFeB magnets with a nickel plating thickness of 5μm or greater and a dimensional accuracy of ±0.1mm. The liquid silicone rubber is LSR with a hardness of Shore A30-50, a tensile strength of 8MPa or greater, and a temperature resistance range of -10°C to 120°C. The solid magnets are N38-N45 NdFeB magnets with a nickel plating thickness of 5μm or greater and a dimensional accuracy of ±0.1mm. The silane coupling agent is KH-550 or KH-570, added at a level of 1-3wt% of the liquid silicone rubber.

[0044] It is worth noting that the hot melt adhesive film is made of EVA or TPU, and the hot pressing temperature is 150-180℃, the pressure is 0.5-1MPa, and the time is 10-20s. The thermal transfer lamination temperature is 180-190℃, the time is 16 seconds, and the lamination yield is ≥98%.

[0045] In addition, the pressure of the vacuum degassing process is ≤-0.08MPa, and the degassing time is 10-15min; the product's tear strength is ≥15MPa, the number of reuses is ≥5 times, and the magnetic attraction force is ≥2N.

[0046] The replaceable magnetic silicone thermal transfer trademark in this embodiment includes a sandwich composite structure, which includes a bottom layer (silicone base), a middle layer (magnetic layer) and a surface layer (hot melt adhesive layer);

[0047] Among them, the bottom layer is made of LSR liquid silicone, which provides flexibility and support, with a hardness of ShoreA30-50 and a temperature resistance of -40℃~120℃; the middle layer is embedded with NdFeB solid magnets, the surface is roughened and coated, the magnetic attraction force is ≥2N, and the surface magnetic induction intensity is ≥0.3T; the surface layer is a hot-melt adhesive film (such as EVA or TPU), and the pattern is thermally transferred through hot pressing molding, and the thermal transfer bonding yield is ≥98%.

[0048] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made based on the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A replaceable magnetic silicone thermal transfer trademark and its preparation method, characterized by: The steps include: S1. Surface roughening treatment is performed on the NdFeB solid magnet, with a roughness of Ra ≥ 3.2 μm, followed by spraying a 0.1 mm thick high-temperature resistant epoxy resin layer with a temperature resistance of ≥ 200°C; S2, mixing platinum catalyzed addition type liquid silicone with silane coupling agent, adding pre-treated solid magnet, and forming a silicone-magnet composite layer by vacuum degassing process, with the residual bubble content ≤0.1%; S3, perform gradient temperature vulcanization, first vulcanize at 120 ° C for 30 minutes, then increase the temperature to 180 ° C for 15 minutes, and the vulcanization process is carried out under nitrogen protection environment; S4, laminating a hot melt adhesive film on the surface of the silicone composite layer and forming a sandwich structure by hot pressing; S5. Use rotary magnetizing fixture combined with finite element simulation to perform post-magnetization treatment to ensure that the surface magnetic induction intensity is ≥0.3T.

2. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The solid magnet is an N38-N45 neodymium iron boron magnet with a nickel plating layer thickness of ≥5 μm and a dimensional accuracy of ±0.1 mm.

3. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The liquid silicone is LSR liquid silicone with a hardness of ShoreA30-50, a tensile strength of ≥8MPa, and a temperature resistance range of -40°C to 120°C.

4. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The solid magnet is an N38-N45 neodymium iron boron magnet with a nickel plating layer thickness of ≥5 μm and a dimensional accuracy of ±0.1 mm.

5. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The silane coupling agent is KH-550 or KH-570, and the addition amount is 1-3wt% of the mass of the liquid silicone.

6. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The hot melt adhesive film is made of EVA or TPU, and the hot pressing molding temperature is 150-180° C., the pressure is 0.5-1 MPa, and the time is 10-20 seconds.

7. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The thermal transfer lamination temperature is 180-200° C., the lamination time is 15-18 seconds, and the lamination yield is ≥98%.

8. The replaceable magnetic silicone thermal transfer trademark and its preparation method according to claim 1, characterized in that: The pressure of the vacuum degassing process is ≤-0.08MPa, and the degassing time is 10-15min; the tearing strength of the product is ≥15MPa, the number of reuses is ≥5 times, and the magnetic attraction force is ≥2N.

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