External magnetic field response curing device for yellowing inhibition type curing agent

Abstract

The invention provides an external magnetic field response curing device for a yellowing inhibition type curing agent, which comprises a reaction chamber internally provided with a vapor chamber; a heating device is arranged on the lower bottom surface of the soaking plate and comprises an electric heating wire, the electric heating wire is wound on an electric heating wire mounting seat, and the electric heating wire mounting seat is mounted on the bottom surface of the reaction chamber; the at least four magnetic field modules are arranged on the left side, the right side, the upper portion and the lower portion of the vapor chamber respectively, and a plurality of permanent magnets arranged according to a Halbach array are arranged on the sides, facing the vapor chamber, of the magnetic field modules. The feeding module is in transmission connection with the magnetic field module; the PLC control driver is electrically connected with the heating device and the feeding module, in the curing process of the curing agent, by rotating the Halbach array or changing the array distance, a magnetic field which changes vertically and horizontally can be generated, directional arrangement of magnetic particles in the curing agent is promoted, ordering of molecular chains is accelerated, heat is rapidly conducted from the vertical longitudinal direction and the parallel transverse direction, and the curing effect of the curing agent is improved. The effects of uniformly controlling the temperature and increasing the capsule rupture rate are achieved.

Description

Technical Field

[0001] This invention relates to the field of curing agents, and more specifically to an external magnetic field responsive curing device for yellowing-inhibiting curing agents. Background Technology

[0002] Epoxy resins are prone to yellowing after curing due to oxidation, ultraviolet radiation, or heat, severely affecting their optical properties and aesthetics. Traditional antioxidants (such as BHT) have limited effectiveness and are prone to migration and failure. In recent years, the synergistic application of smart responsive microencapsulation technology and imidazole derivative promoters has become an innovative direction for solving this problem. By encapsulating inert gases (such as nitrogen) or highly efficient antioxidants (such as hindered phenols) in polyurea-formaldehyde / silica composite wall materials, nanocapsules with diameters of 50–200 nm are constructed. When the resin develops microcracks due to external stimuli (such as ultraviolet radiation or thermal stress), the capsule wall ruptures, releasing active substances that dynamically neutralize free radicals and block oxidation chain reactions.

[0003] Currently, curing devices are generally used to accelerate the curing process, such as CN120620529A, which describes a rapid resin curing device and its usage method. However, existing curing devices often suffer from defects such as localized overheating or insufficient curing of the resin due to uneven heating. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an external magnetic field responsive curing device for yellowing-inhibiting curing agents, which at least solves the technical problem of uneven heating in the curing process of existing curing agents.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] An external magnetic field responsive curing device for a yellowing-inhibiting curing agent includes a reaction chamber with a heat spreader plate inside to meet the temperature requirements of the curing process. A heating element for heating the heat spreader plate is mounted on its lower surface. The heating element includes a heating wire coiled on a heating wire mounting base mounted on the bottom surface of the reaction chamber. At least four magnetic field modules are provided, positioned on the left, right, top, and bottom of the heat spreader plate. Each magnetic field module has multiple permanent magnets arranged in a Heilbeck array on its side facing the heat spreader plate. A feed module is connected to the magnetic field modules to drive the corresponding magnetic field modules closer to or further away from the heat spreader plate. A PLC control driver is electrically connected to the heating elements and feed modules to apply a driving voltage to the heating elements and feed modules according to control commands.

[0007] Optionally, the feed module includes a connecting rod and a drive assembly. One end of the connecting rod is connected to the magnetic field module, and the other end is connected to the drive assembly for transmission. The drive assembly is used to drive the connecting rod to slide back and forth along a preset direction.

[0008] Optionally, the feed module further includes brackets symmetrically arranged on both sides of the connecting rod, and the brackets are provided with a slide bar that is slidably connected to the connecting rod on the side facing the connecting rod.

[0009] Optionally, limiting grooves are provided on both sides of the connecting rod to slide in connection with the corresponding slide bars.

[0010] Optionally, a rotating module for driving the magnetic field module to rotate is further provided between the magnetic field module and the feed module.

[0011] Furthermore, the rotating module includes a connecting seat connected to the end of the connecting rod, a rotating motor is provided on the side of the connecting seat away from the heat spreader, a rotating shaft is rotatably connected to the connecting seat, one end of the rotating shaft is connected to the output end of the rotating motor, and the other end of the rotating shaft is connected to the magnetic field module.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides an external magnetic field responsive curing device for a yellowing-inhibiting curing agent, comprising a reaction chamber, a magnetic field module, and a feeding module; the reaction chamber is equipped with a heat spreader to meet the temperature requirements of the yellowing-inhibiting curing agent during the curing process; wherein the yellowing-inhibiting curing agent contains magnetic particles; at least four magnetic field modules are provided and distributed on the left, right, top, and bottom of the heat spreader, and the magnetic field modules facing the heat spreader are provided with multiple permanent magnets arranged in a Halebeck array; the feeding module is drivenly connected to the magnetic field modules to drive the corresponding magnetic field modules closer to or further away from the heat spreader. During the curing process of the curing agent, by rotating the Halebeck array or changing the array spacing, a magnetic field that changes vertically and horizontally can be generated, promoting the directional arrangement of magnetic particles in the curing agent, accelerating the ordering of molecular chains, allowing the curing agent to quickly absorb heat from the heat spreader and then conduct it rapidly from the vertical longitudinal direction and the parallel transverse direction, improving the thermal conductivity of the entire system, achieving the effect of uniform temperature control and increasing the capsule rupture rate, while significantly enhancing the yellowing inhibition effect. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is an external contour view of the external field coupling response loading device of this application;

[0015] Figure 2 This is a schematic diagram of the internal structure of the external field coupling response loading device of this application;

[0016] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0017] Figure 4 An exploded view of the connection between the connecting rod and the connecting seat;

[0018] Figure 5 This is a schematic diagram of the feed module.

[0019] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0020] Figure label:

[0021] 1-Outer shell, 2-Reaction chamber, 3-Heating plate, 4-Magnetic field module, 5-Rotation module, 6-Feed module, 7-Inner support frame;

[0022] 21-Back plate, 22-Slot, 51-Connecting seat, 52-Rotary motor, 61-Connecting rod, 62-Electric cylinder;

[0023] 611-Limiting groove, 612-Bracket, 613-Sliding bar. Detailed Implementation

[0024] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0025] Please see Figure 1-2This invention provides an external magnetic field responsive curing device for a yellowing-inhibiting curing agent, comprising a reaction chamber 2, a magnetic field module 4, and a feeding module 6. The reaction chamber 2 is equipped with a vapor chamber plate 3 to meet the temperature requirements of the yellowing-inhibiting curing agent during the curing process. The yellowing-inhibiting curing agent comprises epoxy resin and magnetic microcapsules. The magnetic microcapsules contain magnetic particles and UV-531 (2-hydroxy-4-n-octyloxybenzophenone). The preparation method of the magnetic microcapsules can refer to the preparation method provided in Example 1 of CN 104288122 B. The difference from Example 1 of CN 104288122 B is that 3wt% of UV-531 (2-hydroxy-4-n-octyloxybenzophenone) is added to the PVA aqueous solution. In this embodiment, the vapor chamber plate 3 is horizontally placed. During curing, the curing agent to be tested is placed on the surface of the vapor chamber plate 3. The vapor chamber plate 3 has a surrounding barrier, presenting a shallow dish shape, to allow for the placement of more curing agent, thereby controlling the thickness of the cured product. The bottom surface of the heat spreader 3 is provided with a heating device for heating the heat spreader 3. Preferably, the heating device includes a heating wire, which is coiled on a heating wire mounting base. The heating wire mounting base has several mounting grooves, and the heating wire is coiled in the mounting grooves. The heating wire mounting base is fixedly installed at the bottom of the reaction chamber, which can be fixed by bonding or welding. The heat spreader 3 is fixedly connected to the heating wire mounting base, for example, by screw connection. Therefore, the heating wire uses the heating wire mounting base to maintain contact with the heat spreader 3 for heating the heat spreader 3.

[0026] The function of the heat spreader 3 is to uniformly conduct the heat generated by the heating device to the curing agent, so as to achieve uniform heating. During the curing process, the heat released by the curing agent is relatively uniformly diffused, generating a relatively uniform temperature field. This makes the thermal shrinkage and chemical shrinkage generated inside the curing agent relatively consistent, resulting in a small performance and stress gradient inside the product. Consequently, the thermal stress and curing shrinkage stress generated inside the product are small, thereby reducing the probability of curing, bending, matrix cracking, and delamination phenomena in the cured product.

[0027] Therefore, in this embodiment, at least four magnetic field modules 4 are provided and distributed on the left, right, top, and bottom of the heat spreader 3, and the magnetic field module 4 has multiple permanent magnets arranged in a Halebeck array on the side facing the heat spreader 3; the feed module 6 is drively connected to the magnetic field module 4 to drive the corresponding magnetic field module 4 to move closer to or away from the heat spreader 3. A PLC control driver, electrically connected to the heating device and the feed module, is used to apply driving voltage to the heating device and the feed module according to control commands. The PLC control driver is a conventional technology and will not be described in detail here.

[0028] Preferably, a rotating module 5 for driving the magnetic field module 4 to rotate is provided between the magnetic field module 4 and the feeding module 6, so as to realize the alternating change of magnetic field lines and magnetic force, which is beneficial to the rupture of magnetic microcapsules.

[0029] The Helbeck array achieves directional focusing of the magnetic field by arranging permanent magnets according to a specific pattern (such as rotating the magnetization direction of adjacent magnets by 45°). This arrangement causes the magnetic field lines to converge on one side of the array (increasing the magnetic field strength by about 40%), while almost canceling them out on the other side, creating a "one-sided enhancement" effect. In solidification applications, the uniformity of the magnetic field distribution and the intensity gradient can be precisely controlled by adjusting the array's geometric parameters (such as the number of magnetic poles and magnet size) and arrangement (such as ring or linear). The present invention employs a Heilbeck array, which has the following advantages: (1) Improved magnetic field utilization: Reduced magnetic leakage, achieving a high-intensity magnetic field with fewer magnets, reducing energy consumption and cost; (2) Optimized magnetic field uniformity: Through multi-polar arrangement (such as an 8-pole or 24-pole array), a uniform magnetic field is formed in the target area (such as the curing agent layer), reducing local overheating or uneven curing; (3) Dynamic disturbance capability: By rotating the array or changing the array spacing, a magnetic field that changes up and down and left and right can be generated, promoting the directional arrangement of magnetic particles in the curing agent, accelerating the ordering of molecular chains, allowing the curing agent to quickly absorb heat from the heat spreader and conduct it rapidly from the vertical longitudinal direction and the parallel transverse direction. Under the action of the magnetic field, the magnetic particles improve the thermal conductivity of the entire system, achieving the effect of temperature control and increasing the capsule rupture rate. Specifically, during the curing process of the curing agent, the heat spreader is heated, and the upper magnetic field moves downward, causing the magnetic particles in the curing agent to gather upward (float), realizing the accelerated vertical transfer of heat from the lower high-temperature area upward. The upper magnetic field is reset after running for a set time or meeting the set conditions, and the lower magnetic field moves upward, causing the magnetic particles accumulated at the top to sink. The upper and lower magnetic fields are used alternately to continuously and rapidly transfer the heat from the bottom upward. Similarly, the left and right magnetic fields move laterally in opposite directions or simultaneously, allowing the heat to diffuse laterally between layers at an accelerated speed. As time goes by, the rotating magnetic field is used to further disturb the capsule to break and thermally stir.

[0030] For further improvements to the above scheme, please refer to Figure 3-4 The feed module 6 includes a connecting rod 61 and a drive assembly. One end of the connecting rod 61 is connected to the magnetic field module 4, and the other end is connected to the drive assembly. The drive assembly drives the connecting rod 61 to reciprocate along a preset direction. The drive assembly can be a cylinder, electric cylinder, or similar structure. The feed module 6 also includes brackets 612 symmetrically arranged on both sides of the connecting rod 61. Each bracket 612 has a slide bar 613 slidably connected to the connecting rod 61 on its side facing the connecting rod 61. Limiting grooves 611 are provided on both sides of the connecting rod 61, slidably connected to the corresponding slide bars 613. The cooperation between the limiting grooves 611 and the slide bars 613 guides and supports the connecting rod 61. (See also: [link to application]). Figure 5-6The feed module 6 is set outside the reaction chamber 2, that is, outside the back plate 21 of the reaction chamber 2, and a slot 22 is opened on the back plate 21 for the connecting rod 61 to pass through. The bracket 612 is set inside the back plate 21 and fixed with screws.

[0031] As a further improvement to the above solution, the rotating module 5 includes a connecting seat 51 connected to the end of the connecting rod 61. A rotating motor 52 is provided on the side of the connecting seat 51 away from the heat spreader 3. A rotating shaft is rotatably connected to the connecting seat 51. One end of the rotating shaft is connected to the output end of the rotating motor 52, and the other end of the rotating shaft is connected to the magnetic field module 4.

[0032] The following table compares the performance of magnetic curing agents under a magnetic field with that of traditional non-magnetic curing agents under conventional experimental conditions:

[0033] index Magnetic curing agent (Haelbeck array) Traditional non-magnetic curing agents Curing time Shorten by 20%-30% (magnetic field accelerates the reaction) Relying on heat conduction, the process takes a long time. Temperature uniformity Magnetic field disturbance makes temperature distribution more uniform Localized overheating or insufficient curing may occur. Mechanical properties Tensile strength increased by 10%-20%, wear resistance enhanced Performance is greatly affected by the curing process. Energy consumption Magnetic field assistance reduces heating energy consumption by approximately 15%. Requires continuous heating, resulting in high energy consumption.

[0034] As shown in the table above, the external field coupling response loading device of the present invention has the following effects on the curing process of the magnetic curing agent:

[0035] 1) Shortened curing time: Magnetic field disturbance accelerates the Brownian motion of magnetic particles (such as Fe3O4), promoting cross-linking reactions and shortening the curing time by 20%-30%;

[0036] 2) Temperature field homogenization: Magnetic field disturbance makes the heat distribution more uniform, avoiding the material performance degradation caused by local high temperature, and improving the hardness uniformity by more than 15% after curing.

[0037] 3) Enhanced mechanical properties: The magnetic field induces the molecular chains to align in a specific direction, which increases the tensile strength of the material by 10%-20% after curing and significantly improves its wear resistance.

[0038] In summary, the Heilbeck array significantly improves the curing efficiency, uniformity, and material properties of magnetic curing agents through precise magnetic control and dynamic perturbation, demonstrating clear advantages over traditional non-magnetic curing agents in terms of time, energy consumption, and finished product quality.

[0039] Example 2: Comparative Test of Yellowing Performance

[0040] UV aging (ultraviolet accelerated aging) tests were conducted on ordinary curing agents, and yellowing and color difference values ​​were continuously monitored. The data are shown in Table 1.

[0041] The magnetic self-healing capsule prepared in Example 1 was used to obtain a magnetic yellowing inhibitor curing agent according to the steps shown in Example 2. The magnetic yellowing inhibitor curing agent was subjected to UV aging test and the yellowing and color difference values ​​were continuously monitored. The data are shown in Table 1.

[0042] The magnetic self-healing capsule prepared in Example 1 was used to obtain a magnetic yellowing inhibitor curing agent according to the steps shown in Example 2. The response loading device designed in this invention was used to perform a UV aging test on the magnetic yellowing inhibitor curing agent and continuously monitor the yellowing and color difference values. The data are shown in Table 1.

[0043] type Capsule rupture rate (24h) Initial yellowing index Accelerated yellowing index (100-hour UV aging) Color difference after accelerated aging ordinary curing agent / 1.5 32.5 ＞25 Yellowing-inhibiting curing agent 66% 1.5 18.6 12.6 Yellowing-inhibiting curing agent + external field response device 83% 1.6 6.6 4.8

[0044] Table 1 Comparison Test Table of Yellowing Performance

[0045] This table focuses on the aging resistance of curing agents, comparing the performance of three types of materials—"ordinary curing agents," "yellowing-inhibiting curing agents," and "yellowing-inhibiting curing agents + external field response"—in four dimensions: capsule rupture rate, initial yellowing index, yellowing index after accelerated aging, and color difference after accelerated aging. The results are as follows:

[0046] 1) Film breakage rate (24h):

[0047] This data reflects the material's short-term aging resistance. There is no data for ordinary curing agents. The yellowing-inhibiting curing agent (66%) and the "yellowing-inhibiting + external field response" (83%) both showed significant improvements, with the latter being higher, indicating that the external field response further enhanced the material's short-term aging resistance stability.

[0048] 2) Initial Yellowing Index: This data reflects the degree of yellowing of the material in its initial state.

[0049] The initial index differences among the three types of materials are small (ordinary 1.5, yellowing-inhibiting type 1.5, yellowing-inhibiting type + external field response 1.6), indicating that the yellowing-inhibiting curing agent and external field response have limited effects on "initial yellowing" and mainly play a role in inhibiting yellowing during the aging process.

[0050] 3) Accelerated aging yellowing index (100-hour UV aging): This data reflects the degree of yellowing of the material after accelerated aging by ultraviolet light.

[0051] The ordinary curing agent (32.5) is much higher than the yellowing-inhibiting curing agent (18.6) and the "yellowing-inhibiting + external field response" (6.6), and the latter is the lowest. This indicates that the yellowing-inhibiting curing agent can effectively reduce yellowing due to aging, and the external field response further enhances the yellowing inhibition effect.

[0052] 4) Color difference after accelerated aging: This data reflects the degree of color change after the material ages.

[0053] Ordinary curing agent (>25) is much larger than yellowing-inhibiting curing agent (12.6) and "yellowing-inhibiting + external field response" (4.8), and the latter is the lowest, which is consistent with the trend of "yellowing index", further verifying the inhibitory effect of yellowing-inhibiting curing agent and external field response on "aging color difference".

[0054] Based on the above test results, the following conclusions can be drawn:

[0055] 1) Yellowing-inhibiting curing agents: By modifying or adding anti-yellowing additives (such as hindered amines, benzotriazoles, etc.), they block the yellowing mechanisms such as free radical reactions and oxidative degradation caused by ultraviolet rays, thereby inhibiting aging and yellowing.

[0056] 2) External field response: It may be a synergistic agent such as light stabilizer and antioxidant, which forms a "composite protection system" with yellowing-inhibiting curing agent, and synergistically improves aging resistance from multiple dimensions (such as anti-oxidation and light stability), ultimately achieving a further reduction in yellowing index and color difference;

[0057] 3) The test table directly demonstrates that yellowing-inhibiting curing agents can effectively improve aging yellowing, and the combination of "yellowing-inhibiting + external field response" can further enhance aging resistance, providing technical support for the application of curing agents in outdoor facilities, electronic packaging and other scenarios with high requirements for aging resistance.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. An external magnetic field responsive curing device for yellowing-inhibiting curing agents, characterized in that, include: The reaction chamber (2) is equipped with a heat spreader (3) to meet the temperature requirements of the curing process of the yellowing-inhibiting curing agent. A heating device for heating the heat spreader is provided on the bottom surface of the heat spreader. The heating device includes a heating wire, which is coiled on a heating wire mounting base. The heating wire mounting base is installed on the bottom surface of the reaction chamber. At least four magnetic field modules (4) are provided and are respectively located on the left, right, top and bottom of the heat spreader (3), and the magnetic field modules (4) are provided with a plurality of permanent magnets arranged in a Heilbeck array on the side facing the heat spreader (3); The feed module (6) is connected to the magnetic field module (4) for driving the corresponding magnetic field module (4) to move closer to or away from the heat exchange plate (3). The PLC control driver is electrically connected to the heating device and the feed module (6) and is used to apply driving voltage to the heating device and the feed module (6) according to the control command to make them work.

2. The external magnetic field responsive curing device for a yellowing-inhibiting curing agent according to claim 1, characterized in that, The feed module (6) includes: The connecting rod (61) is connected at one end to the magnetic field module (4) and at the other end to the drive assembly. The drive assembly is connected to the link (61) for driving the link (61) to slide back and forth in a preset direction.

3. The external magnetic field responsive curing device for a yellowing-inhibiting curing agent according to claim 2, characterized in that, The feed module (6) also includes brackets (612) symmetrically arranged on both sides of the connecting rod (61), and the brackets (612) are provided with a slide bar (613) slidably connected to the connecting rod (61) on the side facing the connecting rod (61).

4. The external magnetic field responsive curing device for a yellowing-inhibiting curing agent according to claim 3, characterized in that, Both sides of the connecting rod (61) are provided with limiting grooves (611) that are slidably connected to the corresponding slide bars (613).

5. An external magnetic field responsive curing device for a yellowing-inhibiting curing agent according to any one of claims 2-4, characterized in that, A rotating module (5) for driving the magnetic field module (4) to rotate is also provided between the magnetic field module (4) and the feed module (6).

6. The external magnetic field responsive curing device for a yellowing-inhibiting curing agent according to claim 5, characterized in that, The rotating module (5) includes a connecting seat (51) connected to the end of the connecting rod (61). A rotating motor (52) is provided on the side of the connecting seat (51) away from the heat spreader (3). A rotating shaft is rotatably connected to the connecting seat (51). One end of the rotating shaft is connected to the output end of the rotating motor (52) for transmission, and the other end of the rotating shaft is connected to the magnetic field module (4).

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