Anti-static shielding bag

Abstract

The invention relates to the technical field of anti-static, in particular to an anti-static shielding bag. The anti-static shielding bag comprises a first sealing piece and a second sealing piece, the edge of the first sealing piece and the edge of the second sealing piece are sealed, and a containing cavity is formed between the first sealing piece and the second sealing piece; the first sealing piece and the second sealing piece each comprise a first anti-static layer, a wear-resistant coating, a paper base layer, a conductive layer, a water-based polymer layer and a second anti-static layer which are sequentially arranged in a stacked mode in the direction from the interior of the containing cavity to the exterior of the containing cavity. And the first sealing sheet and the second sealing sheet both adopt paper base layers to replace traditional plastic base layers, so that remarkable advantages in multiple aspects can be brought, and particularly, the performance in the aspects of environmental protection, functional adaptation and sustainable development is outstanding.

Description

Technical Field

[0001] This disclosure relates to the field of antistatic technology, and in particular to an antistatic shielding bag. Background Technology

[0002] In the electronics industry, static electricity poses a significant threat to various precision electronic components and integrated circuits, potentially causing malfunctions, accidental operation, or even component breakdown and premature aging, severely impacting product quality and production yield. Therefore, anti-static shielding bags used to package these electronic products are crucial materials for ensuring their safety during transportation and storage.

[0003] Currently, most antistatic shielding bags on the market are made primarily of plastic materials such as PET / PE. These materials take 100-200 years to degrade naturally, and their widespread use puts enormous pressure on the environment. With the continuous advancement of global plastic reduction policies and the increasing environmental, social, and corporate governance requirements of enterprises, the electronics industry has an urgent need for plastic-reduced, plastic-free, and biodegradable packaging, and urgently requires biodegradable antistatic shielding bag alternatives. Summary of the Invention

[0004] This disclosure provides an antistatic shielding bag to at least solve the above-mentioned technical problems existing in the prior art.

[0005] This disclosure provides an antistatic shielding bag, comprising: a first sealing sheet and a second sealing sheet, wherein the edges of the first sealing sheet and the edges of the second sealing sheet are sealed together, and an accommodating cavity is formed between the first sealing sheet and the second sealing sheet;

[0006] Along the direction from inside the accommodating cavity to outside the accommodating cavity, both the first sealing sheet and the second sealing sheet include a first antistatic layer, a wear-resistant coating, a paper base layer, a conductive layer, a water-based polymer layer, and a second antistatic layer stacked sequentially.

[0007] Furthermore, both the first antistatic layer and the second antistatic layer are prepared by the following method, the method comprising:

[0008] A quaternary ammonium salt compound, water, and an organic solvent are mixed to obtain a slurry;

[0009] The slurry is coated onto the surface of the wear-resistant coating, and after drying, a first antistatic layer is formed on the surface of the wear-resistant coating.

[0010] The slurry is coated onto the surface of the aqueous polymer layer, and after drying, a second antistatic layer is formed on the surface of the aqueous polymer layer.

[0011] Furthermore, in the slurry, based on the total mass of the slurry (100%), the mass concentration of the quaternary ammonium salt compound is 1% to 5%, the mass concentration of the water is 80% to 90%, and the mass concentration of the organic solvent is 5% to 10%.

[0012] Furthermore, the surface resistance of the first antistatic layer is 10. 7 Ω~10 8 Ω;

[0013] The surface resistance of the second antistatic layer is 10. 7 Ω~10 8 Ω.

[0014] Furthermore, the basis weight of the paper substrate is 80 g / m³. 2 In this case, the tensile strength σb of the paper base layer is ≥40MPa.

[0015] Furthermore, the thickness of the conductive layer is 300–500 angstroms, and the resistance of the conductive layer is less than 10 Ω·cm. 4 Ω.

[0016] Furthermore, the thickness of the conductive layer is 300–500 angstroms, and the shielding effectiveness (SE) is 30–50 dB.

[0017] Furthermore, the coating amount of the aqueous polymer layer is 1.2 g / m². 2 ~3.0g / m 2 .

[0018] Furthermore, the wear-resistant coating is made of water-based polyurethane material.

[0019] Furthermore, the wear-resistant coating has a coating amount of 3 g / m². 2 ~5g / m 2 The coefficient of friction μ ≤ 0.3.

[0020] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0021] The antistatic shielding bag provided in this embodiment includes a first sealing sheet and a second sealing sheet. The edges of the first sealing sheet and the second sealing sheet are sealed together, forming a receiving cavity between them. Along the direction from the inside of the receiving cavity to the outside, both the first and second sealing sheets include a first antistatic layer, a wear-resistant coating, a paper base layer, a conductive layer, a water-based polymer layer, and a second antistatic layer, which are sequentially stacked. In the antistatic shielding bag provided in this embodiment, both the first and second sealing sheets use a paper base layer instead of a traditional plastic base layer, which brings many significant advantages, especially in terms of environmental protection, functional compatibility, and sustainable development.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0023] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0024] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0025] Figure 1 A schematic diagram of the structure of the antistatic shielding bag provided in an embodiment of this disclosure is shown;

[0026] Figure 2 A schematic diagram of the sealing sheet in the antistatic shielding bag provided in this embodiment is shown.

[0027] The labels in the diagram are as follows: 1. First sealing sheet; 2. Second sealing sheet; 3. Receptacle; 11. First antistatic layer; 12. Wear-resistant coating; 13. Paper base layer; 14. Conductive layer; 15. Water-based polymer layer; 16. Second antistatic layer. Detailed Implementation

[0028] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0029] Combination Figure 1 and Figure 2As shown, the antistatic shielding bag provided in this embodiment includes a first sealing sheet 1 and a second sealing sheet 2. The edges of the first sealing sheet 1 and the second sealing sheet 2 are sealed together, forming a cavity 3 between the first sealing sheet 1 and the second sealing sheet 2. Along the direction from the inside of the cavity 3 to the outside of the cavity 3, both the first sealing sheet 1 and the second sealing sheet 2 include a first antistatic layer 11, a wear-resistant coating 12, a paper base layer 13, a conductive layer 14, a water-based polymer layer 15, and a second antistatic layer 16, which are sequentially stacked. The paper base layer 13 itself has a certain rigidity and stiffness, providing stable structural support for the antistatic shielding bag. Combined with the wear-resistant coating 12, it enhances tear resistance. Simultaneously, the loose structure of the plant fibers provides slight cushioning performance to the bag, helping to protect the sensitive electronic components inside the antistatic shielding bag. The wear-resistant coating 12 provides physical protection to the inside of the antistatic shielding bag, ensuring the stability of the overall structure and function. The wear-resistant coating 12 forms a protective film on the surface of the paper base layer 13, reducing the possibility of damage to the antistatic shielding bag due to friction.

[0030] The wear-resistant coating 12 has good adhesion to the adjacent first antistatic layer 11 and paper base layer 13, which can enhance the connection strength between the three layers, avoid interlayer separation caused by external force, and indirectly ensure the coordinated operation of the entire multi-layer structure.

[0031] The wear-resistant coating 12 can be made of high-hardness, scratch-resistant materials such as modified resins and nano-reinforced coatings, which can resist mechanical friction that may occur during the packaging process, such as contact with hard electronic components and wear from repeated opening and closing operations, reduce the risk of damage to the inside of the bag, and extend the service life of the shielding bag.

[0032] The conductive layer 14 can be composed of conductive materials such as carbon black, metal foil, or conductive fibers, forming a continuous conductive network. When static electricity is generated inside or outside the bag, it can be quickly conducted to the outside of the bag or grounded through the conductive layer 14, preventing static electricity from accumulating locally to a voltage sufficient to break down electronic components and reducing electrostatic discharge (ESD) damage to sensitive items at its source. The conductive layer 14 can also utilize the "Faraday cage" principle to reflect or absorb external electromagnetic radiation such as radio waves and magnetic fields, preventing them from penetrating the bag and affecting internal electronic components; at the same time, it can also prevent internal items, such as devices with electromagnetic radiation, from interfering with the outside environment, making it particularly suitable for packaging products such as chips and circuit boards that are sensitive to electromagnetic environments.

[0033] Water-based polymers possess excellent wettability and adhesion, enabling them to tightly bond adjacent conductive layers 14 and the second antistatic layer 16. Simultaneously, they form a stable bond with the paper base layer 13, preventing delamination or peeling of the layers during folding, stretching, or external impact, thus ensuring the structural integrity of the shielding bag. Compared to traditional oil-based adhesives, water-based polymers use water as a solvent, contain no volatile organic compounds, reducing environmental pollution during production. Furthermore, they are better suited to the biodegradable properties of the paper base layer 13, ensuring that adhesive residues do not negatively impact the overall environmental friendliness.

[0034] The first antistatic layer 11, which comes into direct contact with items such as electronic components or precision devices inside the accommodating cavity 3, can suppress the generation and accumulation of internal static electricity. Through its antistatic properties, the first antistatic layer 11 can prevent items from generating static electricity due to friction or contact, or prevent static electricity from accumulating locally inside the bag, or reduce static electricity transfer caused by friction between the antistatic shielding bag and the internal items. This eliminates the risk of breakdown or damage to sensitive items caused by electrostatic discharge, ensuring that items are always in a low-static-risk environment during the packaging process. It is especially suitable for products such as microelectronic components and chips that are extremely sensitive to static electricity.

[0035] The second antistatic layer 16 is located on the outermost layer of the antistatic shielding bag and is in direct contact with the external environment. It can prevent static electricity in the external environment from being conducted to the inside through the surface of the bag, forming an external static protection barrier.

[0036] The first antistatic layer 11 and the second antistatic layer 16 are located on the inner side (side of the accommodating cavity 3) and the outer side of the bag body, respectively, and together they can form a two-way electrostatic protection system.

[0037] In the electrostatic shielding bag provided in this embodiment, both the first sealing sheet 1 and the second sealing sheet 2 use a paper base layer 13 instead of a traditional plastic base layer, which brings many significant advantages, especially in terms of environmental protection, functional compatibility and sustainable development.

[0038] In some specific embodiments, both the first antistatic layer 11 and the second antistatic layer 16 are prepared by the following method: mixing a quaternary ammonium salt compound, water, and an organic solvent to obtain a slurry; coating the slurry onto the surface of the wear-resistant coating 12, and after drying, forming the first antistatic layer 11 on the surface of the wear-resistant coating 12; coating the slurry onto the surface of the aqueous polymer layer 15, and after drying, forming the second antistatic layer 16 on the surface of the aqueous polymer layer 15. The quaternary ammonium salt compound is a cationic antistatic agent. Its molecular structure contains hydrophilic groups (such as ammonium ions) and hydrophobic groups. After coating and forming a film, it can absorb trace amounts of moisture from the air through the hydrophilic groups, forming a continuous conductive water film on the coating surface. This allows static electricity to dissipate quickly through the water film, achieving an ionic conductivity effect, which is particularly suitable for maintaining stable antistatic performance in low-humidity environments. The hydrophobic groups in the molecule can form a good bond with the surfaces of the wear-resistant coating 12 and the aqueous polymer layer 15, ensuring that the antistatic layer is not easily detached due to friction or wiping, thus extending the duration of the antistatic effect.

[0039] The solvent components in the slurry can slightly wet the surface of the wear-resistant coating 12 or the water-based polymer layer 15, so that the quaternary ammonium salt coating and the wear-resistant coating 12 or the water-based polymer layer 15 form a chemical or physical bond, reducing the risk of peeling of the antistatic layer from the wear-resistant coating 12 or the water-based polymer layer 15, ensuring the integrity of the multi-layer structure, and reducing the possibility of the antistatic layer falling off due to friction.

[0040] In some specific embodiments, the slurry contains, by weight (100%), quaternary ammonium salt compounds at a concentration of 1%–5%, water at a concentration of 80%–90%, and organic solvents at a concentration of 5%–10%. This maximizes material utilization while ensuring antistatic effects.

[0041] In some specific embodiments, the surface resistance of the first antistatic layer 11 is 10. 7 Ω~10 8 Ω; the surface resistance of the second antistatic layer 16 is 10 Ω. 7 Ω~10 8 Ω. This allows the first antistatic layer 11 and the second antistatic layer 16 to form a weakly conductive layer, preventing significant electromagnetic reflection and ensuring compatibility with products sensitive to electromagnetic environments. The surface resistance of the first antistatic layer 11 and the second antistatic layer 16 is controlled to be within 10 Ω. 7 Ω~10 8 Ω represents the optimal balance between electrostatic protection efficiency, compatibility with multilayer structures, and safety in use. It can effectively eliminate internal and external static electricity while avoiding the risk of damage caused by excessive conductivity, ultimately ensuring that the entire multilayer structure can stably perform its antistatic function in scenarios such as electronic packaging and precision instrument protection.

[0042] In some specific embodiments, the basis weight of the paper base layer 13 is 80 g / m³. 2 Under the condition that the tensile strength σb of the paper base layer 13 is ≥40MPa. The basis weight of the paper base layer 13 is 80g / m³. 2 In this case, the paper thickness is 0.1mm to 0.15mm, resulting in a lighter weight per unit area, which directly reduces material usage and overall product weight. Meanwhile, the tensile strength is ≥40MPa, achieving high strength while maintaining lightweight construction. (80g / m²) 2 With a quantitative formula and a tensile strength of ≥40MPa, the paper base layer 13 possesses both appropriate stiffness and flexibility. Stiffness ensures that the material maintains its shape during use, such as allowing a shielding bag to open on its own for easy loading and unloading of items, avoiding inconvenience caused by excessive softness; flexibility ensures that the material can be folded and bent, such as conforming to the contours when packaging irregularly shaped items, while also preventing brittleness and cracking in harsh environments such as low temperatures, thus broadening its applicable scenarios.

[0043] In some specific embodiments, the thickness of the conductive layer 14 is 300–500 angstroms, and the resistance of the conductive layer 14 is less than 10 Ω·cm. 4 Ω. The thickness of the conductive layer 14 is 300-500 angstroms to avoid material stiffness and reduced folding performance caused by excessive thickness of the conductive layer 14, thus maintaining the flexibility and lightweight characteristics of the substrate. The conductive layer 14 maintains low resistance at an ultra-thin thickness of 300-500 angstroms, ensuring that the conductive layer 14 is free of pinholes and has good continuity, avoiding functional failure caused by local high resistance.

[0044] In some specific embodiments, the thickness of the conductive layer 14 is 300–500 angstroms, and the shielding effectiveness (SE) is 30–50 dB. The thickness of the conductive layer 14 (300–500 angstroms) avoids material stiffness and reduced folding performance caused by excessive thickness, maintaining the flexibility and lightweight characteristics of the substrate. The shielding effectiveness (SE) of 30–50 dB blocks electromagnetic interference from the external environment, preventing signal disruption in internal circuits.

[0045] In some specific embodiments, the coating amount of the aqueous polymer layer 15 is 1.2 g / m². 2 ~3.0g / m 2 For the conductive layer 14 and the second antistatic layer 16 that require interlayer bonding, 1.2 g / m 2 The above coating amount can form a continuous polymer film, ensuring that the interfacial adhesion meets the standard and avoiding delamination and peeling; 3.0 g / m 2 The following can prevent excessively thick adhesive layers due to over-coating, resulting in brittleness after drying, or surface contamination caused by excess polymer overflow. 1.2g / m 2 With a film thickness of ~3.0 g / m, the drying speed is faster in conventional drying processes, which can be matched with high-speed coating production lines to improve production efficiency.

[0046] In some specific embodiments, the wear-resistant coating 12 is made of waterborne polyurethane material. Waterborne polyurethane molecules contain a large number of urethane groups, resulting in a film with high strength, high elasticity, and good abrasion resistance. Compared to traditional waterborne acrylic coatings, its abrasion resistance can be improved by 30% to 50%, effectively resisting scratches from hard objects and repeated friction. The wear-resistant layer formed by waterborne polyurethane material has excellent elastic recovery, and is not prone to permanent scratches after external impact or friction, maintaining surface integrity.

[0047] In some specific embodiments, the abrasion-resistant coating 12 has a coating weight of 3 g / m². 2 ~5g / m 2 The coefficient of friction μ ≤ 0.3. If the coating amount is less than 3 g / m²... 2 Discontinuous coating can lead to increased local friction coefficients, compromising the overall low-friction effect; if the coating amount exceeds 5 g / m², further damage can occur. 2 While this might further reduce the coefficient of friction, it would lead to increased costs and drying energy consumption. Furthermore, an excessively thick film could affect the substrate's flexibility, ultimately weakening the user experience. A μ≤0.3 coating maximizes the functional value of the wear-resistant coating 12 at this application rate. Within a reasonable material usage range, it minimizes wear risk through low-friction characteristics, avoiding the shortcomings of the traditional approach of simply increasing coating thickness to improve wear resistance, thus achieving a more efficient protective design. The application rate of the wear-resistant coating 12 is 3 g / m². 2 ~5g / m 2 Combined with a friction coefficient μ≤0.3, it can form an effective protective film through an appropriate coating amount, and reduce friction damage with low friction characteristics. Ultimately, in scenarios such as electronic component packaging, it can provide reliable protection for sensitive items while improving ease of operation and controlling material costs.

[0048] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this disclosure can be achieved, and this is not limited herein.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] The above are merely specific embodiments of this disclosure, but the scope of protection of this patent is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An antistatic shielding bag, characterized in that, include: A first sealing piece (1) and a second sealing piece (2) are provided, wherein the edges of the first sealing piece (1) and the second sealing piece (2) are sealed together, and a receiving cavity (3) is formed between the first sealing piece (1) and the second sealing piece (2); Along the direction from inside the accommodating cavity (3) to outside the accommodating cavity (3), the first sealing sheet (1) and the second sealing sheet (2) each include a first antistatic layer (11), a wear-resistant coating (12), a paper base layer (13), a conductive layer (14), a water-based polymer layer (15), and a second antistatic layer (16) stacked in sequence.

2. The antistatic shielding bag according to claim 1, characterized in that, Both the first antistatic layer (11) and the second antistatic layer (16) are prepared by the following method, which includes: A quaternary ammonium salt compound, water, and an organic solvent are mixed to obtain a slurry; The slurry is applied to the surface of the wear-resistant coating (12), and after drying, a first antistatic layer (11) is formed on the surface of the wear-resistant coating (12); The slurry is coated on the surface of the aqueous polymer layer (15), and after drying, a second antistatic layer (16) is formed on the surface of the aqueous polymer layer (15).

3. The antistatic shielding bag according to claim 2, characterized in that, In the slurry, based on the total mass of the slurry (100%), the mass concentration of the quaternary ammonium salt compound is 1% to 5%, the mass concentration of the water is 80% to 90%, and the mass concentration of the organic solvent is 5% to 10%.

4. The antistatic shielding bag according to claim 2, characterized in that, The surface resistance of the first antistatic layer (11) is 10. 7 Ω~10 8 Ω; The surface resistance of the second antistatic layer (16) is 10. 7 Ω~10 8 Ω.

5. The antistatic shielding bag according to claim 1, characterized in that, The basis weight of the paper base layer (13) is 80 g / m³. 2 In the case of the paper base layer (13), the tensile strength σb ≥ 40 MPa.

6. The antistatic shielding bag according to claim 1, characterized in that, The conductive layer (14) has a thickness of 300–500 angstroms and a resistance of less than 10 Ω·cm. 4 Ω.

7. The antistatic shielding bag according to claim 1, characterized in that, The conductive layer (14) has a thickness of 300-500 angstroms and a shielding effectiveness (SE) of 30dB-50dB.

8. The antistatic shielding bag according to claim 1, characterized in that, The coating amount of the aqueous polymer layer (15) is 1.2 g / m². 2 ~3.0g / m 2 .

9. The antistatic shielding bag according to claim 1, characterized in that, The wear-resistant coating (12) is made of water-based polyurethane material.

10. The antistatic shielding bag according to claim 1, characterized in that, The wear-resistant coating (12) has a coating amount of 3 g / m. 2 ~5g / m 2 The coefficient of friction μ ≤ 0.3.

Images