A flexible flat strip material structure close to automatic magnetic passive release, and a magnetic watch strap and buckle

Abstract

The utility model discloses a flexible flat strip material structure close to automatic magnetic attraction and passive release, the structure includes a flexible NdFeB magnetic strip, and also includes a flexible magnetic strip with the same shape and size as the magnetic strip, and the two magnetic strips are tightly covered with a middle flexible isolation layer and an outer flexible decorative layer in sequence. The structure is easy to produce and has a wide range of uses. It is close to automatic magnetic attraction and can only be released passively. It is flexible, heat-resistant, moisture-resistant and corrosion-resistant. The magnetic attraction is evenly distributed on the entire surface of the attraction. The adsorption length can be adjusted at will. The magnetic adsorption can be maintained in a curved or straight state. The magnetic force of the non-attractive outward surface is sharply weakened. The two magnetic strips of this structure are respectively installed on two parts that need to be frequently combined, fixed and released, such as a magnetic watch strap and a buckle, which is extremely convenient.

Description

Technical Field

[0001] The utility model belongs to the field of magnetic materials, and particularly relates to a flexible flat strip material structure close to automatic magnetic attraction and passive release, and a magnetic attraction watchband and a buckle. Background Art

[0002] The application of magnetic attraction in strip products is developing rapidly, and there are many products on the market, each with its own advantages;

[0003] Publication (Announcement) No.: TWM645981U, an improvement on a watch strap structure, mainly comprising: a first watch strap is sequentially formed by a first watch strap buckle, each link component, each link component and a watch strap mounting component, and a second watch strap is sequentially formed by a second watch strap buckle, each link component, each link component and a watch strap mounting component, wherein the first watch strap buckle and the second watch strap buckle can be mutually attracted and positioned by first magnetic suction components and second magnetic suction components disposed inside, and then fastened and fixed or detached by a pressing buckle and a snap component, in addition, the first watch strap and the second watch strap can utilize the pivoting mechanism in each link component to extend and retract the adjacent link components to be detached or pivotally positioned, and the first watch strap buckle and the second watch strap buckle can allow the user to quickly and conveniently fasten the first watch strap and the second watch strap, and at the same time, the pivoting mechanism of each link component can achieve the effect of quick disassembly and quick installation, and the strap range can be arbitrarily and quickly adjusted according to the thickness of the user's wrist. However, the patent relies on the local magnetic attraction of the magnetic attraction component, and does not involve the overall magnetic attraction of the strap and the flexibility of the magnetic attraction component itself;

[0004] Publication (Announcement) No.: CN108272324A A self-priming closed magnetic strip for a flexible door curtain and a preparation method thereof, discloses a self-priming closed magnetic strip for a flexible door curtain and a preparation method thereof and a preparation method thereof, comprising at least one pair of adjacent flexible magnetic strips of the same material wrapped in the edge of the flexible door curtain, the magnetic strips comprising a tightly connected permanent magnetic layer and a soft magnetic layer, and a pair of magnetic strips with mutually attracted sides with different north and south poles on the front and back sides, the side thickness of the magnetic strips is not more than 5mm, and the width of the front and back sides is not less than the thickness. The preparation method of the magnetic strip comprises the following steps: the permanent magnetic layer and the soft magnetic layer are calendered separately, the soft magnetic layer is tightly connected to the front and back surfaces of the permanent magnetic layer by lamination or gluing, the strips are rolled up, and the magnetic strips are magnetized along the thickness direction. The present invention realizes uniform adsorption of the side of the door closing magnetic strip, good door closing effect, better user experience, thinner magnetic strip thickness, easy striping and mass production of products, higher productivity and yield rate, and lower production cost. However, the patent does not involve corrosion protection measures for the magnetic material of the magnetic strip, nor does it involve the comprehensive requirements for flexibility, magnetic force and mechanical properties of flexible products with flexural magnetic adsorption and retention characteristics;

[0005] For flexible strip products that can automatically attract and maintain a bent shape when attracted, stronger magnetic attraction is required. However, stronger magnetic attraction requires more magnetic materials and thicker structures, which poses more challenges to the mechanical strength of magnetism, such as heat resistance, corrosion resistance, and flexibility. These also reversely restrict the flexibility, fit, corrosion resistance, and mechanical strength of the strip products. Utility Model Content

[0006] To this end, the utility model discloses a flexible flat strip material structure close to automatic magnetic attraction and passive release. The two magnetic strips attracted to each other in the structure have sufficient surface magnetism and magnetic adsorption force. After magnetic attraction, they can remain curved or straight, and are soft and fit. The magnetic strips also have improved resistance to temperature and humidity and acid and alkali corrosion.

[0007] A flexible flat strip material structure close to automatic magnetic attraction and passive release, comprising a flexible NdFeB magnetic strip and a flexible magnetic strip with the same shape and size as the magnetic strip, the two magnetic strips are tightly coated with a middle flexible isolation layer and an outer flexible decorative layer in sequence, and the two magnetic strips are in an attraction or release state;

[0008] The coating covers all surfaces of the magnetic strip, especially enhancing the anti-dew measures at the sides and corners of the magnetic strip;

[0009] Placing magnetic circuit paper on the flat surface of the flexible NdFeB magnetic strip will display a multi-pole parallel linear magnetization magnetic circuit along the length direction of the magnetic strip;

[0010] One of the flexible magnetic strips with the same shape and size as the flexible NdFeB magnetic strip is a flexible NdFeB magnetic strip. If a magnetic circuit paper is placed on its flat surface, a multi-pole parallel linear magnetized magnetic circuit along the length of the magnetic strip is displayed, which is paired with the magnetic circuit on the flat surface of the other flexible NdFeB magnetic strip in the structure and attracts each other.

[0011] The magnetic path is formed by electromagnetic pulses;

[0012] The magnetic circuit is greatly weakened on the opposite sides of the flattened opposing surfaces of the two magnetic strips in the structure, i.e., the non-opposing surfaces;

[0013] The flexible NdFeB magnetic strip is in the core layer, which is a composite structure in which NdFeB powder is evenly distributed in the CPE matrix component;

[0014] In a specific embodiment, the NdFeB magnetic strip is formed by calendering;

[0015] In a specific embodiment, the median particle size D50 of the NdFeB powder particles is greater than 4 μm and less than 50 μm;

[0016] In a specific embodiment, the surface magnetism of the flat suction surface of the flexible NdFeB magnetic strip is 1300~2200Gs, and the surface magnetism of the suction decorative surface is 1560~1650Gs;

[0017] In a specific embodiment, the flexible NdFeB magnetic strip and the flexible magnetic material magnetic strip with the same shape and size as the flexible NdFeB magnetic strip have the same thickness of 1.30-2.40±0.05mm, the same width of 10.0-22.0±0.5mm, and the same length of 8.0-13.5±0.5cm;

[0018] In a specific embodiment, the size is the size of the bare magnetic strip itself;

[0019] In a specific embodiment, the isolation layer is one of a UV coating, a flexible PET, a flexible PE, a flexible PP, a flexible PU, a flexible PVC, a flexible TPU, and a flexible EVA film, and the thickness of the isolation layer is 0.005 to 0.10 mm;

[0020] In a specific embodiment, the close covering method is one of gluing, heat sealing, laminating and coating;

[0021] In a specific embodiment, the flexible decorative layer is one of leather and textile, and has a thickness of 0.30~0.60±0.05mm;

[0022] In a specific embodiment, the flexible magnetic strip having the same shape and size as the magnetic strip is one of an iron-based flexible magnetic strip, an iron-rubber flexible magnetic strip, and a samarium-iron-nitrogen magnetic strip. This structure does not include the following magnetic watch straps;

[0023] A magnetic watch strap, comprising a group of flexible flat strip material structures for automatic magnetic attraction and passive separation as described in any of the above items, wherein the flexible flat strip material structures are both flexible NdFeB magnetic strips, and the two watch straps can only be separated passively when they are close to each other and automatically attracted to each other;

[0024] A magnetic buckle comprises two groups of flexible flat strip material structures that are close to automatic magnetic attraction and passive release as described in any of the above items, wherein the two groups of flexible NdFeB magnetic strips and the flexible magnetic strips that attract each other are respectively installed on the bag cover and the bag body to form two groups of buckles, thereby realizing automatic mutual attraction and passive release of the buckles. Beneficial Effects

[0025] The core layer of the magnetic stripe for attraction is a flexible NdFeB composite structure. The design of the particle size and the coordination of CPE make the magnetic stripe itself flexible enough. After tightly covering the middle layer and the decorative outer layer of the flexible isolation film, it still maintains sufficient flexibility, ensuring sufficient flexibility and smooth fit when bending.

[0026] Relying on electromagnetic pulse magnetization, the magnetic properties of NdFeB magnetic strips can be fully exerted. Under the condition of sufficient magnetic force of the strap, the magnetic strips can be thin enough to reduce weight and save materials; at the same time, the isolation layer in the middle helps to provide sufficient tensile and mechanical strength, which guarantees the corrosion resistance and magnetic retention of NdFeB.

[0027] Because the magnetic properties are evenly distributed over the entire flat mutually attracting surface of the magnetic strip, the adsorption length can be adjusted automatically and randomly as needed without discontinuity; although the adsorption force changes with the size of the adsorption area and weakens with the thickness of the isolation layer, the surface magnetic strength of 1900-2200Gs in the embodiment can satisfy the strip material in a bent state; the surface magnetic and magnetic attraction of the non-attracting surface drop sharply, reducing the influence of magnetic attraction on the periphery;

[0028] It is easy to produce and has a wide range of uses. It is close to automatic magnetic attraction, can only be released passively, and has flexible, curved or straight magnetic adsorption. The two magnetic strips of this material structure are installed separately on the two parts that need to be frequently combined, fixed and released, which is extremely convenient.

[0029] The technical solution of the present application is further described below in conjunction with the accompanying drawings, and its beneficial effects will also be reflected therein. The selection of the thickness of the isolation layer in Examples 1 and 2 is not a limitation on the technical solution of the present application, and any non-creative additions, combinations, decorations, and replacements to the technical solution will fall within the scope of protection of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 , the magnetic circuit paper is placed on the flat surface of two flexible NdFeB magnetic strips of the attraction structure to display the magnetic circuit;

[0031] Figure 2 , the cross-sectional structure of the magnetic strip;

[0032] Figure 3 , the two straps are maintained in a magnetically curved shape by magnetic attraction;

[0033] Figure 4 , the structure of the magnetic strip connecting part;

[0034] In the figure, 1a is a flexible NdFeB magnetic strip; 1b is a flexible magnetic strip attracted to it; 2 is a flexible isolation layer; 3 is a flexible decorative layer; 4 is a single-sided multi-pole parallel magnetization magnetic circuit along the length direction of the magnetic strip; 5 is a connection structure. DETAILED DESCRIPTION

[0035] Example 1, reference Figure 1 , the magnetic circuit paper is placed on the flat surface of the two flexible NdFeB magnetic strips that are attracted to each other, showing a multi-pole parallel straight line magnetization magnetic circuit along the length direction of the magnetic strip. The relative magnetic poles of the two magnetic strips are opposite, and the magnetic moment is the same: 4mm. The magnetic circuit paper includes a flexible NdFeB flat magnetic strip 1a and a flexible NdFeB magnetic strip 1b with the same shape and size as the two magnetic strips, forming a flexible flat strip material structure close to automatic magnetic attraction passive separation; refer to Figure 2, two magnetic strips are the core layer, calendering, and are a composite structure in which NdFeB powder is evenly distributed in the CPE matrix component; the median particle size D50 of the powder particles is a mixture of half 25μm and half 5μm, the length of the magnetic strip is 12.0±0.5cm, the thickness is 1.5±0.5mm, and the width is 16.0±0.5mm. The outer surfaces of the two magnetic strips are tightly glued and covered with a 0.1mm thick flexible TPU isolation film as the middle layer, and the anti-dew measures are especially enhanced on the sides and corners of the magnetic strips; and then tightly glued and covered with a 0.40±0.05mm thick flexible decorative layer of sheepskin; the surface magnetism of the flat opposing surfaces on the two magnetic strips 1a and 1b is measured to be 1900~2200Gs , the sheepskin surface is 1560-1650Gs, the magnetic force on the non-adsorbing surface on the back of the adsorbing surface is greatly weakened, and the adsorption forces of the embodiments 1-2 with the same size and appearance and the comparative examples 1-7 with the same size and appearance are recorded in detail in Table 1;

[0036]

[0037] Remark:

[0038] The iron glue, SmFeN magnetic strips and ferrite magnetic strips in Table 1 and Table 2 are all soft composite structures, with iron base, SmFeN and ferrite particles evenly distributed in the CPE matrix component; the tinplate in Tables 1 and 2 is flexible and has the same thickness of 1.5mm; the "direct" in Tables 1 and 2 refers to the adsorption force data on the opposing surfaces of the two magnetic strip core layers; the 1mm and 0.8mm intervals in the table are the data measured on sheepskin; the ratio = adsorption force on the surface of the decorative layer * 100 / direct adsorption force.

[0039] Results and Analysis 1:

[0040] Table 1 Example 1 has the strongest adsorption force compared with Example 2 and Comparative Examples 1-7, and can meet the adsorption requirements in the bending state and the straight state under the mutually attractive flexible magnetic strip structure;

[0041] The adsorption force decreases sharply with the increase of the distance between the two magnetic strips, but the retention ratio of samarium iron nitrogen is the largest, which is 44 and 38 respectively in the table. Therefore, under the condition that the isolation of the adsorption surface is less than 0.8mm, the adsorption force meets 160g / cm 2 Although less than 360g / cm 2 When the magnetic stripe structure is used, it can still be used;

[0042] The thickness of the isolation layer and the decorative layer can be adjusted according to actual conditions.

[0043] The mechanical properties of the two magnetic strips of the mutually attracted flexible magnetic strip structure were measured, and the results are recorded in Table 2;

[0044]

[0045] It does not crack when wrapped around a rod with a diameter of 0.8mm, which means it is still flexible when folded in half.

[0046] Reference Figure 3 A magnetic watch strap, comprising a group of flexible flat strip material structures for automatic magnetic passive separation as described in the first embodiment above, wherein the flexible NdFeB magnetic strip and the flexible NdFeB magnetic strip for opposite attraction are respectively connected to the two ends of the watch, and the two watch straps can only be separated passively when they are close to each other and automatically attracted to each other, and the two watch straps are magnetically attracted to maintain a curved shape, and the structure of the connection between the watch strap and the watch is referred to Figure 4 .

[0047] Take 3 strap samples and measure the reliability. The results are recorded in Table 3.

[0048]

[0049] Remark

[0050] Test method:

[0051] a. Soak the dust-free cloth thoroughly with acidic sweat and alkaline sweat, take out the dust-free cloth and wrap the strap samples respectively, and then place them in sealed plastic bags under the temperature and humidity conditions of 55℃ and 95%RH;

[0052] b. Take out the sample after a period of time and check the magnetic adsorption, appearance and physical properties;

[0053] The sweat formula is as follows:

[0054] a. Take 5g of sodium chloride and 5g of disodium hydrogen phosphate and add them to a 250ml beaker A;

[0055] b. Use a measuring tube to measure 100 ml of pure water and pour it into beaker A;

[0056] c. Stir the solution with a glass rod to fully dissolve the solid;

[0057] d. Carefully add sodium hydroxide solution to the mixed solution with a pipette to make its pH value reach 9.5;

[0058] e. Pour 50 ml of the mixed solution into beaker B. The solution in beaker B is the required alkaline sweat;

[0059] f. Carefully add glacial acetic acid solution to beaker A so that its pH reaches 4.7, and beaker A contains the desired acidic sweat;

[0060] Test results:

[0061] After the test, the appearance of the strap is normal. Although the surface of the core NdFeB magnetic strip is rusty, there is no obvious deformation, blistering, cracks, shedding or rust. The physical properties are normal and meet the requirements of Table 2.

[0062] The sheepskin strap has no appearance defects such as debonding, delamination, blistering, cracking, etc., and can meet the normal use of the strap;

[0063] The three magnetic stripe processing methods have better effects than the film processing.

[0064] Results and Analysis 2:

[0065] The mutually attractive magnetic strip structure needs to maintain the magnetic attraction in a curved state, and the flexibility and mechanical strength requirements are higher than those in a conventional straight state. It is also necessary to overcome the easy corrosion characteristics of neodymium iron boron. The results in Tables 1, 2, and 3 show that a magnetic watch strap with the structure of Example 1 can maintain the magnetic attraction of the watch strap in a curved state, and is resistant to high temperature, high humidity, and acid and alkali corrosion, meeting the actual use requirements of the watch strap.

[0066] A magnetic buckle, comprising two groups of flexible flat strip material structures close to automatic magnetic attraction passive release as described in the above embodiment 2, wherein the flexible samarium iron nitrogen magnetic strip and the flexible samarium iron nitrogen magnetic strip attracted thereto are respectively connected to the bag body and the bag cover to form two groups of buckles, so as to realize the automatic mutual attraction passive release of the buckles close to each other, and the difference from the embodiment 2 is that the isolation during mutual attraction is less than 0.8 mm, the thickness of the isolation layer and the decorative layer is adjusted, and the suction force is between 360 g / cm 2 and 160g / cm 2 The structure of the connection between the magnetic strip and the bag body and cover is referenced Figure 4 , the two magnetic strips are magnetically attracted to keep them straight and vertical.

Claims

1. A flexible flat strip material structure close to automatic magnetic passive release, characterized by: It includes a flexible NdFeB magnetic strip and a flexible magnetic strip with the same shape and size as the NdFeB magnetic strip. The two magnetic strips are tightly covered with a middle flexible isolation layer and an outer flexible decorative layer in turn. The two magnetic strips are in a state of attraction or separation.

2. According to claim 1, a flexible flat strip material structure close to automatic magnetic attraction and passive release, characterized in that: Placing magnetic path paper on the flat suction surface of the flexible NdFeB magnetic strip will display a multi-pole parallel linear magnetization magnetic circuit along the length direction of the magnetic strip.

3. According to claim 1, a flexible flat strip material structure close to automatic magnetic attraction and passive release is characterized by: One of the flexible magnetic strips with the same shape and size as the one being attracted to it is a flexible NdFeB magnetic strip. If magnetic circuit paper is placed on its flat surface, a multi-pole parallel linear magnetized magnetic circuit will be displayed along the length of the magnetic strip, which will pair up with the magnetic circuit on the flat surface of another flexible NdFeB magnetic strip in the structure and attract each other.

4. A flexible flat strip material structure close to automatic magnetic attraction and passive release according to any one of claims 1 to 3, characterized in that: The flexible NdFeB magnetic strip is in the core layer, and is a composite structure in which NdFeB powder is evenly distributed in the CPE matrix component.

5. A flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 4, characterized in that: The median particle size D50 of the NdFeB powder particles is greater than 4 μm and less than 50 μm.

6. The flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 4, characterized in that: The surface magnetism of the flat suction surface of the flexible NdFeB magnetic strip is 1300-2200Gs, and the surface magnetism of the suction decorative surface is 1560-1650Gs.

7. The flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 1, characterized in that: The flexible NdFeB magnetic strip and the flexible magnetic strip with the same shape and size as the flexible magnetic strip have the same thickness of 1.30~2.40±0.05mm, the same width of 10.0~22.0±0.5mm, and the same length of 8.0~13.5±0.5cm.

8. The flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 1, characterized in that: The isolation layer is one of UV coating, flexible PET, flexible PE, flexible PP, flexible PU, flexible PVC, flexible TPU, and flexible EVA film, and the thickness of the isolation layer is 0.005~0.10mm.

9. The flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 1, characterized in that: The tight coating method is one of gluing, heat sealing, laminating and coating.

10. The flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 1, characterized in that: The decorative layer is one of leather and textile, and has a thickness of 0.30~0.60±0.05mm.

11. The flexible flat strip material structure close to automatic magnetic attraction and passive release according to claim 1, characterized in that: The flexible magnetic strip with the same shape and size as the magnetic strip is one of an iron-based flexible magnetic strip, an iron-gel flexible magnetic strip, and a samarium-iron-nitrogen magnetic strip.

12. A magnetic watch strap, characterized in that: It comprises a group of flexible flat strip material structures capable of passive separation near automatic magnetic attraction as described in any one of claims 1 to 10, wherein the flexible flat strip material structures are each composed of one flexible NdFeB magnetic strip, and the two watch straps can only be separated passively when they are close to each other and automatically attracted to each other.

13. A magnetic buckle, characterized by: It comprises two groups of flexible flat strip material structures capable of automatic magnetic attraction and passive release as described in any one of claims 1 to 11, wherein the two groups of flexible NdFeB magnetic strips and the flexible magnetic strips attracted thereto are respectively mounted on the bag cover and the bag body to form two groups of buckles, thereby realizing automatic mutual attraction and passive release of the buckles.

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