Bidirectional humidifying bag and preparation method thereof

Abstract

The invention discloses a two-way humidifying bag, which belongs to the technical field of humidifying, and comprises a humidifying core material and a packaging body for packaging the humidifying core material, the humidifying core material is formed by adsorbing a saturated salt solution by a porous carrier, the mass ratio of the salt solution to the porous carrier is 1: (1-3), the saturated salt solution comprises the following components in percentage by weight: 30% of water, 30-70% of citrate and 0-40% of chlorine salt, and the saturated salt solution comprises the following components in percentage by weight: 20-30% of water, 30-70% of citric acid and 0-40% of chlorine salt. The mass ratio of the water to the citrate to the chlorine salt is 10: (10-23): (0-13), the packaging body is of a three-layer composite structure and sequentially comprises an outer protection layer, a middle layer and an inner contact layer from outside to inside, the outer protection layer is made of PET, the inner contact layer is made of PE, inner air holes are evenly distributed in the inner contact layer in an array mode, outer air holes corresponding to the inner air holes in a staggered mode are formed in the outer protection layer, and the middle layer is made of PE. And the hole positions of the outer air holes correspond to gap areas among the four adjacent inner air holes. Two-way precise humidity adjustment is achieved, the packaging body is excellent in air permeability and humidity resistance, core material leakage is effectively avoided, and the humidity balance rate is increased.

Description

Technical Field

[0001] This invention relates to the field of humidity control technology, and in particular to a two-way humidity control pack and its preparation method. Background Technology

[0002] In the field of food preservation, humidity control is one of the core factors determining quality and safety. Traditional desiccants or humidification methods only provide one-way adjustment and are insufficient to cope with the dynamic fluctuations in humidity in the storage environment. However, the emergence of two-way humidity control packs is reshaping the standards of food preservation with their intelligent and precise humidity management capabilities.

[0003] The core importance of a two-way humidity control pack lies in its ability to actively maintain a preset, stable humidity balance point (such as 65%RH). Its internal high-performance humidity control material can respond bidirectionally to environmental changes: when the ambient humidity is too high, it absorbs excess moisture to prevent food from becoming damp and moldy; when the environment is too dry, it releases the stored moisture to effectively prevent food from drying out, cracking, hardening, losing weight, and losing flavor due to dehydration. This dynamic balancing ability is unmatched by one-way dehumidifiers.

[0004] In the prior art, the moisture-regulating core material in the two-way humidity-regulating package is formed by adsorbing saturated salt solution with a gelling substance. The packaging body is a two-layer composite structure. The gelling substance has extremely high viscosity, and moisture mainly diffuses slowly through the surface. The two-layer composite structure of the packaging body has poor air permeability and moisture-proof performance, the core material is prone to leakage, and it further limits the exchange rate and reduces the humidity balance rate. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a two-way humidity regulating bag that can absorb moisture in high humidity environments and release moisture in low humidity environments, thereby achieving two-way precise humidity regulation. It also has a large humidity regulating capacity, strong durability, excellent air permeability and moisture-proof performance, effectively avoids core material leakage, and improves the humidity balance rate.

[0006] The objective of this invention is achieved through the following technical solution: A two-way humidity regulating package includes a humidity regulating core material and a packaging body encapsulating the humidity regulating core material. The humidity regulating core material is formed by adsorbing a saturated salt solution onto a porous carrier. The porous carrier is at least one of a metal-organic framework material, mesoporous silica, and activated carbon fiber. The mass ratio of the salt solution to the porous carrier is 1:(1-3). By weight percentage, the saturated salt solution comprises 30% water, 30-70% citrate, and 0-40% chloride. The mass ratio of water, citrate, and chloride is 10:(10-23):(0-13). The packaging body... It is a three-layer composite structure, which is prepared by coating, lamination and hot pressing. The three layers are, from the outside to the inside, an outer protective layer, an intermediate layer and an inner contact layer. The outer protective layer is made of PET, the inner contact layer is made of PE, and the intermediate layer is parchment or glassine paper that has been fluorinated or siliconized. The inner contact layer has an array of evenly arranged internal vent holes, and the outer protective layer has external vent holes that are staggered and corresponding to the internal vent holes. The positions of the external vent holes correspond to the gap areas between four adjacent internal vent holes.

[0007] Furthermore, the inner vent hole diameter of the inner contact layer is 0.1-0.5 mm, and the hole spacing is 2-5 mm; the outer vent hole diameter of the outer protective layer is 0.3-0.8 mm, and the hole spacing is 3-6 mm.

[0008] Furthermore, the porous carrier is a composite material of metal-organic framework material and mesoporous silica, with a mass ratio of 1:(1-2).

[0009] Furthermore, the citrate is at least one of sodium citrate and potassium citrate, and the chloride is at least one of sodium chloride, potassium chloride, and magnesium chloride.

[0010] Furthermore, the total thickness of the packaging body is 0.3-0.8 mm, and the thickness ratio of each layer is outer protective layer: middle layer: inner contact layer = 1:(0.5-1.5):1.

[0011] Compared with existing technologies, the bidirectional humidity control pack of the present invention has the following beneficial effects: (1) The humidity regulating core material of the present invention is composed of a saturated salt solution and a porous carrier in a specific ratio. The compound system of citrate and chloride can achieve bidirectional regulation of a wide humidity range. It can quickly adsorb water in a high humidity environment and slowly release water in a low humidity environment, effectively maintaining the environmental humidity in a suitable range and adapting to various humidity fluctuation scenarios.

[0012] (2) The porous carrier of the present invention uses high-performance adsorption materials such as metal-organic framework materials and mesoporous silica. Its unique pore structure has a large specific surface area and excellent adsorption stability, which can firmly adsorb saturated salt solutions, avoid salt solution loss, and greatly improve the humidity control capacity and service life of the humidity control core material. Compared with existing humidity control packs, the humidity control duration can be extended by more than 30%.

[0013] (3) The packaging body of the present invention adopts a three-layer composite structure. The outer protective layer and the inner contact layer are made of PET or PE material, which has high mechanical strength and wear resistance. The middle layer is made of parchment paper or glassine paper that has been fluorinated or siliconized, which has excellent hydrophobic and moisture-proof performance. The ventilation holes of the inner and outer protective layers are staggered to take into account both ventilation efficiency and leakage prevention performance, effectively avoid core material leakage, and at the same time improve the moisture-proof ability of the humidity-regulating package to ensure stable humidity-regulating effect.

[0014] (4) The saturated salt solution of the present invention uses environmentally friendly components such as citrate and chloride, and does not release toxic or harmful substances. It will not cause corrosion or pollution to the items being humidified (such as food, cultural relics, electronic components, etc.), and is highly safe to use. It can be widely used in many fields such as food preservation, cultural relic protection, and electronic equipment storage.

[0015] (5) The preparation of the moisture-regulating core material of the present invention only requires mixing and adsorbing the porous carrier with the saturated salt solution. The packaging body is prepared by conventional coating, lamination, composite and hot pressing processes. The preparation process is simple, the production process is convenient, the cost is low, and it is easy to achieve large-scale production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the packaging structure of the bidirectional humidity regulating pack of the present invention.

[0017] In the diagram: 10. Packaging body; 11. Outer protective layer; 111. Outer vent; 12. Middle layer; 13. Inner contact layer; 131. Inner vent. Detailed Implementation

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] A two-way humidity regulating package includes a humidity regulating core material and a packaging body that encapsulates the humidity regulating core material.

[0022] The humidity-regulating core material is formed by adsorbing saturated salt solution onto a porous carrier. The porous carrier is a metal-organic framework material (UiO-66). The mass ratio of salt solution to porous carrier is 1:1. This ratio allows the porous carrier to fully adsorb the saturated salt solution while avoiding the risk of leakage due to excessive salt solution, thus ensuring that the humidity-regulating core material has the best humidity-regulating capacity and structural stability.

[0023] By weight percentage, the saturated salt solution comprises 30% water, 50% sodium citrate, and 20% magnesium chloride, with a mass ratio of 10:17:7. The citrate and chloride mixture can be precisely adjusted to achieve different humidity ranges by changing the ratio. Both components exhibit good biocompatibility and environmental friendliness, and will not cause corrosion or pollution to the items being humidified or the environment.

[0024] like Figure 1 As shown, the packaging body has a three-layer composite structure, consisting of an outer protective layer, a middle layer, and an inner contact layer from the outside to the inside. It is prepared by a process of coating, lamination, and hot pressing, with a total thickness of 0.3 mm. The thickness ratio of each layer is outer protective layer: middle layer: inner contact layer = 1:0.5:1.

[0025] The outer protective layer is made of PET material, and the inner contact layer is made of PE material. The inner contact layer has an evenly distributed array of internal vent holes with a diameter of 0.1mm and a spacing of 2mm. The outer protective layer has external vent holes that are staggered with the internal vent holes, and the positions of the external vent holes correspond to the gap areas between four adjacent internal vent holes to ensure no straight airflow channels. The diameter of the external vent holes is 0.3mm and the spacing of the holes is 3mm. The middle layer is made of fluorinated parchment paper with a thickness of 0.1mm. It has hydrophobic and breathable properties. The staggered arrangement of the outer layer relative to the inner layer can form a "double protection-stabilized flow" system with the middle layer: it blocks straight channels through staggered holes and further blocks water vapor by utilizing the hydrophobic properties of the middle layer. This perfectly matches the "long-lasting and stable humidity regulation" requirement of the humidity regulating core material, effectively prevents leakage of humidity regulating core material particles, and enhances the moisture-proof performance of the packaging, preventing rapid intrusion of external moisture or rapid loss of moisture from the core material. Example

[0026] A two-way humidity regulating package includes a humidity regulating core material and a packaging body that encapsulates the humidity regulating core material.

[0027] The humidity-regulating core material is formed by adsorbing saturated salt solution onto a porous carrier. The porous carrier is a composite material of metal-organic framework (UiO-66) and mesoporous silica (mass ratio of 2:3). This composite material combines the high specific surface area of ​​metal-organic framework with the excellent pore structure of mesoporous silica, which can significantly improve the adsorption capacity and adsorption stability of saturated salt solution, prevent the loss of salt solution during the humidity regulation process, and thus improve the humidity regulation durability of the humidity-regulating pack.

[0028] The mass ratio of salt solution to porous carrier is 1:2. By weight percentage, the saturated salt solution includes 30% water, 40% potassium citrate, and 30% sodium citrate, with a mass ratio of water, potassium citrate, and sodium citrate of 10:13:10.

[0029] The packaging body has a three-layer composite structure, manufactured through processes such as lamination, coating, lamination, and hot pressing, with a total thickness of 0.5mm. The thickness ratio of each layer is outer protective layer: middle layer: inner contact layer = 1:1:1. This thickness design ensures that the packaging body has sufficient mechanical strength to prevent damage during use, while also taking into account breathability and moisture-proof performance, enabling long-term stable use of the humidity regulating pack.

[0030] The outer protective layer is made of PET material, the inner contact layer is made of PE material, and the middle layer is made of fluorinated glassine paper with a thickness of 0.2mm. The inner contact layer has an evenly distributed array of internal vent holes with a diameter of 0.3mm and a spacing of 3mm. The outer protective layer has staggered external vent holes with a diameter of 0.5mm and a spacing of 4mm. Example

[0031] A two-way humidity regulating package includes a humidity regulating core material and a packaging body that encapsulates the humidity regulating core material.

[0032] The humidity-regulating core material is formed by adsorbing saturated salt solution onto a porous carrier. The porous carrier is a composite material of activated carbon fiber and mesoporous silica (mass ratio 1:1).

[0033] The mass ratio of salt solution to porous carrier is 1:3. By weight percentage, the saturated salt solution includes 30% water, 30% sodium citrate, and 30% sodium chloride, with a mass ratio of water, sodium citrate, and sodium chloride of 10:10:13.

[0034] The packaging body has a three-layer composite structure, manufactured through processes such as lamination, coating, lamination, and hot pressing, with a total thickness of 0.8mm. The thickness ratio of each layer is outer protective layer: middle layer: inner contact layer = 1:1.5:1. The outer protective layer is made of PET material, the inner contact layer is made of PE material, and the middle layer is made of fluorinated glassine paper with a thickness of 0.3mm. The inner contact layer has evenly arranged internal vent holes with a diameter of 0.5mm and a spacing of 5mm. The outer protective layer has staggered external vent holes with a diameter of 0.8mm and a spacing of 6mm.

[0035] Comparative Example 1 Comparative Example 1 of the present invention provides a two-way humidity regulating bag, the specific implementation of which is the same as that of Example 1, except that the humidity regulating core material is formed by adsorbing a saturated salt solution with a gelling substance, the gelling substance being xanthan gum, and the mass ratio of the salt solution to the gelling substance being 100:5.

[0036] Comparative Example 2 Comparative Example 2 of the present invention provides a two-way humidity regulating package, the specific implementation of which is the same as that of Example 2, except that the packaging body is a two-layer composite structure, which is prepared by coating, laminating and hot pressing processes, with a total thickness of 0.5 mm. The thickness ratio of each layer is outer protective layer: inner contact layer = 1:1. The outer protective layer is made of kraft paper and the inner contact layer is made of PE material.

[0037] Comparative Example 3 Comparative Example 3 of the present invention provides a two-way humidity regulating package, including a humidity regulating core material and a packaging body for encapsulating the humidity regulating core material.

[0038] The moisture-regulating core material is formed by adsorbing a saturated salt solution onto a gelling substance. The composition of the salt solution is the same as in Example 3. Xanthan gum is selected as the gelling substance, and the mass ratio of the salt solution to the gelling substance is 100:5.

[0039] The packaging body is a two-layer composite structure, which is made by lamination, coating, lamination and hot pressing. The total thickness is 0.5mm, and the thickness ratio of each layer is 1:1 for the outer protective layer and the inner contact layer. The outer protective layer is made of kraft paper and the inner contact layer is made of PE material.

[0040] This application also relates to a method for preparing the above-mentioned two-way humidity regulating bag and its application in regulating the relative humidity of air in a closed space. The method for preparing the two-way humidity regulating bag includes the following steps: S1: Dissolve the selected salts in water to prepare a saturated salt solution, and then prepare a three-layer packaging body through coating, lamination, and hot pressing. S2: Immerse the porous carrier in a saturated salt solution and obtain a moisture-conditioning core material loaded with salt solution after full adsorption; S3: Encapsulate the moisture-regulating core material in the packaging and heat-seal the edges.

[0041] Performance testing methods Two-way humidity regulation performance: The two-way humidity regulating packs (8g) prepared in the examples and comparative examples were placed in a 1-liter space with a certain humidity. The time required for the humidity change ΔRH20% in the space to be adjusted to the target value ±2% was recorded. The results are shown in the table below:

[0042] As can be seen from the above test results, the bidirectional humidity-regulating packs prepared in Examples 1-3 of this invention all have a wide range of bidirectional humidity-regulating capabilities. Unlike the "bulk absorption" of traditional gelling substances, the porous carrier provides a huge adsorption surface area and a fast capillary diffusion channel for water vapor. The porous carrier is a fast "surface and pore adsorption". The rapid moisture absorption characteristics of the porous carrier, combined with the highly permeable packaging body of the three-layer composite structure, allow water vapor to enter and exit quickly, thereby achieving a fast humidity balance rate.

[0043] This invention successfully developed a bidirectional humidity-regulating bag by optimizing the carrier-salt solution ratio of the humidity-regulating core material and combining it with a three-layer composite packaging design. This humidity-regulating bag possesses advantages such as precise bidirectional humidity regulation, long-lasting humidity regulation, leak-proof design, and environmental friendliness. It solves the technical problems of existing bidirectional humidity-regulating bags, such as poor air permeability and moisture-proof performance, easy leakage of the core material, and low humidity balancing rate. It can be widely used in various fields such as food preservation, cultural relic protection, electronic device storage, and home environment regulation, and has significant practical value and market potential.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A two-way humidity regulating pack, characterized in that: The product includes a humidity-regulating core material and a packaging body for encapsulating the humidity-regulating core material. The humidity-regulating core material is formed by adsorbing a saturated salt solution onto a porous carrier. The porous carrier is at least one of a metal-organic framework material, mesoporous silica, and activated carbon fiber. The mass ratio of the salt solution to the porous carrier is 1:(1-3). By weight percentage, the saturated salt solution comprises 30% water, 30-70% citrate, and 0-40% chloride. The mass ratio of water, citrate, and chloride is 10:(10-23):(0-13). The packaging body is a three-layer composite material. The composite structure is prepared by coating, laminating, and hot pressing. The three layers are, from the outside to the inside, an outer protective layer, an intermediate layer, and an inner contact layer. The outer protective layer is made of PET, the inner contact layer is made of PE, and the intermediate layer is parchment or glassine paper that has been fluorinated or siliconized. The inner contact layer has an array of uniformly arranged internal vent holes, and the outer protective layer has external vent holes that are staggered and corresponding to the internal vent holes. The positions of the external vent holes correspond to the gap areas between four adjacent internal vent holes.

2. The bidirectional humidity regulating pack according to claim 1, characterized in that: The inner vent holes of the inner contact layer have a diameter of 0.1-0.5 mm and a spacing of 2-5 mm, while the outer vent holes of the outer protective layer have a diameter of 0.3-0.8 mm and a spacing of 3-6 mm.

3. The bidirectional humidity regulating pack according to claim 1, characterized in that: The porous carrier is a composite material of metal-organic framework and mesoporous silica, with a mass ratio of 1:(1-2).

4. The bidirectional humidity regulating pack according to claim 1, characterized in that: The citrate is at least one of sodium citrate and potassium citrate, and the chloride is at least one of sodium chloride, potassium chloride, and magnesium chloride.

5. The bidirectional humidity regulating pack according to claim 1, characterized in that: The total thickness of the packaging body is 0.3-0.8mm, and the thickness ratio of each layer is outer protective layer: middle layer: inner contact layer = 1:(0.5-1.5):

1.

6. A method for preparing a bidirectional humidity-regulating pack as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S1: Dissolve the selected salts in water to prepare a saturated salt solution, and then prepare a three-layer composite packaging body through coating, lamination, and hot pressing. S2: Immerse the porous carrier in the saturated salt solution, and after full adsorption, obtain the moisture-conditioning core material loaded with salt solution; S3: The humidity-regulating core material is encapsulated in the packaging body and the edges are heat-sealed.

7. The application of a two-way humidity regulating bag according to any one of claims 1-5 in regulating the relative humidity of air in an enclosed space.

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