Efficient moisture-proof lining bag for container and preparation method of efficient moisture-proof lining bag

Abstract

The invention relates to the technical field of container transportation and packaging, and particularly discloses an efficient moisture-proof lining bag for a container and a preparation method of the efficient moisture-proof lining bag. The preparation method of the efficient damp-proof lining bag for the container comprises the steps that the braid layer on the outer side and the blocking layer on the inner side are prepared, and the silicon-containing interface mixing layer is arranged on one side of the blocking layer; preparing a first moistureproof coating and a second moistureproof coating, respectively coating the first moistureproof coating and the second moistureproof coating on two sides of the braid layer, and curing to form a first moistureproof coating and a second moistureproof coating; the side, without the silicon-containing interface mixing layer, of the blocking layer is attached to the side, coated with the second moisture-proof coating, of the weaving layer, and after heat sealing, cutting and bonding are conducted according to the specific size. The efficient damp-proof lining bag for the container prepared by the preparation method of the efficient damp-proof lining bag for the container can be used in the field of container packaging and transportation, and has excellent damp-proof barrier property and durability.

Description

Technical Field

[0001] The present application relates to the technical field of container transport packaging, and more specifically, to a high-efficiency moisture-proof liner bag for a container and a preparation method thereof. Background Art

[0002] With the rapid development of global trade, container shipping has become one of the most important modes of transportation in international logistics. Controlling the internal environment is crucial to the safety and quality of goods. Flexible container liner bags, a key component of container transportation, are primarily used to load and protect various bulk cargoes, including non-hazardous chemicals, minerals, and agricultural products. These are particularly sensitive to moisture and environmental factors, such as electronics, food, pharmaceuticals, and some chemical raw materials. These goods are susceptible to environmental influences during transportation, leading to moisture, deterioration, or contamination, resulting in economic losses and safety risks.

[0003] In response to the aforementioned related technologies, the inventors discovered that existing flexible container liner bags are typically made of materials such as low linear density polyethylene (LLDPE). Although these materials have certain moisture-proof properties, in extreme humidity environments or during long-term transportation, especially when transporting dry bulk cargo inside sea containers, the moisture-proof and barrier properties of existing container liner bags cannot meet the high standards of cargo protection required. They cannot effectively prevent condensation caused by temperature fluctuations inside the container or moisture released by the cargo itself, which can cause the cargo to become damp and affect its quality. Summary of the Invention

[0004] In order to improve the moisture-proof performance and barrier performance to the external environment of flexible liner bags for containers, the present application provides a high-efficiency moisture-proof liner bag for containers and a preparation method thereof.

[0005] In a first aspect, the present application provides a method for preparing a high-efficiency moisture-proof liner bag for a container, which adopts the following technical solution: A method for preparing a high-efficiency moisture-proof liner bag for a container comprises the following steps: An outer braided layer and an inner barrier layer are prepared, and a silicon-containing interface mixed layer is provided on one side of the barrier layer; preparing a first moisture-proof coating and a second moisture-proof coating, and coating the first moisture-proof coating and the second moisture-proof coating on both sides of the braided layer respectively, and forming a first moisture-proof coating and a second moisture-proof coating after curing; The barrier layer is laminated on the side without the silicon-containing interface mixed layer and the braided layer is coated with the second moisture-proof coating. After heat sealing, the layers are cut and bonded according to a specific size to obtain the product.

[0006] By adopting the above technical solution, the present application sets up a double-layer bag design of an outer woven layer and an inner barrier layer to form an effective moisture-proof barrier system.

[0007] The outer woven layer provides greater strength to withstand weight and impact during transport, reducing the risk of breakage. The inner barrier layer further enhances the liner bag's moisture and barrier properties, increasing its durability and protection from the external environment.

[0008] The provision of moisture-proof coatings inside and outside the woven layer further enhances the bag's moisture-proof properties, effectively preventing the inward penetration of water vapor and the invasion of other harmful substances on the bulk cargo inside, effectively protecting the contents from damage by moisture and other environmental factors. The introduction of the innermost silicon-containing interfacial hybrid layer introduces hydrophobic silicon groups on the surface of the barrier layer plastic film, which can significantly reduce the moisture vapor transmission rate of the barrier layer. This provides the final layer of protection in the liner bag's moisture barrier system, protecting the bulk cargo inside from adverse environmental factors such as external water vapor.

[0009] Optionally, based on weight, the raw materials of the braided layer include 31-41 parts of HDPE resin, 14-21 parts of methyl silicone resin and 0.3-0.6 parts of lubricant; the raw materials of the barrier layer include 37-51 parts of LLDPE resin, 15-23 parts of polytrifluorochloroethylene, 8-12 parts of LDPE resin and 0.5-1.5 parts of antibacterial agent.

[0010] Optionally, the raw material of the braided layer further includes an antioxidant and an antistatic agent, and the raw material of the barrier layer further includes a compatibilizer and an antistatic agent.

[0011] By adopting the above technical solution, the presence of the antioxidant further extends the service life of the braided layer and prevents it from being degraded due to oxidation.

[0012] Optionally, the lubricant is polyethylene wax.

[0013] By adopting the above technical solution, polyethylene wax is used as a lubricant, which improves the processing performance of the raw materials and facilitates the preparation of the braided layer and the coating.

[0014] Optionally, the antibacterial agent is selected from any one of nano-silver or nano-titanium dioxide or a combination of the two.

[0015] By adopting the above technical solution, nanosilver or nanotitanium dioxide has excellent antibacterial properties, which helps to keep the liner bag clean and hygienic, reduce material degradation caused by microbial growth, and improve the durability of the liner bag.

[0016] Optionally, the method for preparing the braided layer comprises the following steps: S1: proportionally mix HDPE resin, methyl silicone resin and lubricant and other raw materials uniformly to obtain a mixture; S2: melt-extrude the mixture into a film at 260-280℃, then cool the film, draw, cut, stretch and set, and wind to obtain a spinning fiber, the fineness of the spinning fiber being 1000-1400 denier; S3: weave the spinning fiber into a woven layer in a plain weave manner, the warp density of the woven layer being 13-16 strands / cm, and the weft density being 13-16 strands / cm.

[0017] By adopting the above technical solution, the introduction of methyl silicone resin can effectively improve the weather resistance and chemical corrosion resistance of the woven layer.

[0018] The woven layer formed by the preparation method has excellent flexibility, wear resistance and impact resistance, and can form an effective barrier between the internal bulk cargo and the external environment to prevent the internal cargo from being damaged due to environmental influence.

[0019] Optionally, the preparation method of the barrier layer comprises the following steps: S1: proportionally mix LLDPE resin, polytrifluorochloroethylene, LDPE resin and antibacterial agent and other raw materials uniformly, melt at 220-240℃, extrude into a mold, then blow-mold into a film and shape at 170-200℃ to obtain a bag film; S2: pretreat the surface of the bag film by argon plasma bombardment cleaning to obtain a pretreated bag film; S3: form a silicon-containing interface mixed layer on one side of the pretreated bag film by plasma immersion ion implantation method, using 150-250sccm of tetramethylsilane and 80-120sccm of acetylene as mixed reaction gas, depositing at 8.5-9.2Pa vacuum degree and 0.8-1kv voltage for 90-120min.

[0020] By adopting the above technical solution, using LLDPE resin, polytrifluorochloroethylene and LDPE resin as main components significantly improves the flexibility, strength and barrier performance of the inner barrier layer, the use of polytrifluorochloroethylene significantly improves the chemical stability and corrosion resistance of the barrier layer, further ensuring the barrier protection performance of the inner barrier layer.

[0021] By hollow cathode plasma immersion ion implantation on the surface of the film, using a mixture of tetramethylsilane and acetylene as the reaction gas, a dense silicon-containing interface mixed layer of silicon-doped diamond-like carbon coating is formed on the surface of the pretreated bag film, significantly improving the barrier protection performance of the inner barrier layer against water vapor, oxygen and other gases.

[0022] The silicon element in the silicon-containing interface mixed layer can adsorb moisture molecules to form SiOx(OH)y gel, thereby reducing the permeability of moisture molecules. When the barrier layer is subjected to external pressure or temperature changes, the silicon element can also desorb and release the adsorbed moisture molecules, further reducing the moisture permeability of the barrier layer and improving the moisture barrier performance of the liner bag.

[0023] Optionally, the first moisture-proof coating is formed by curing a first moisture-proof paint, and the first moisture-proof paint is a water-based polyurethane paint.

[0024] By adopting the above technical solution, the water-based polyurethane coating has excellent waterproof and wear-resistant properties and flexibility. The cured first moisture-proof coating serves as the outermost layer of the liner bag for the container, forming an effective barrier between the inside of the liner bag and the external environment, thereby improving the moisture-proof and wear-resistant properties of the liner bag.

[0025] Optionally, the second moisture-proof coating is formed by curing a second moisture-proof paint. The raw materials of the second moisture-proof paint include, by weight, 37-42 parts of acrylic modified silicone resin, 12-16 parts of water-based EAU acrylic emulsion, 5.5-6.5 parts of curing agent, 0.1-0.2 parts of wetting agent, 0.1-0.2 parts of dispersant, 0.1-0.2 parts of defoaming agent, 0.3-0.6 parts of film-forming aid, 3-5 parts of nano-silica, 6-8 parts of graphene oxide and 12.5-16.5 parts of water.

[0026] By employing this technical solution, the graphene oxide sheet structure can be stacked layer by layer, acting as a physical filler to form a dense physical barrier within the second moisture-proof coating. This effectively extends the diffusion path for water molecules and makes it more difficult for them to pass through. Furthermore, the addition of graphene oxide increases the mechanical strength and toughness of the braided layer, further enhancing the liner's ability to withstand external pressure and abrasion, thereby reducing the risk of water molecule penetration caused by liner damage.

[0027] Nano-silica has a high specific surface area and activity, and can also absorb water molecules, increasing the density and barrier properties of the coating.

[0028] Mixing graphene oxide with nano-silica can significantly improve the dispersibility of nano-silica and maximize the moisture-proof barrier performance of the second moisture-proof coating.

[0029] Optionally, the curing agent is a water-based polyurea resin curing agent.

[0030] By adopting the above technical solution, a water-based polyurea resin curing agent is obtained, which has good bonding properties and water resistance, and helps to improve the stability and durability of the coating.

[0031] Optionally, the thickness of the first moisture-proof coating is 0.5-1 mm, and the thickness of the second moisture-proof coating is 0.1-0.3 mm.

[0032] By adopting the above technical solution, it helps to ensure the moisture-proof effect of the coating at this thickness setting without excessively increasing the weight and cost of the material.

[0033] In a second aspect, the present application provides a high-efficiency moisture-proof liner bag for a container, which adopts the following technical solution: A high-efficiency moisture-proof liner bag for a container is prepared by the preparation method of a high-efficiency moisture-proof liner bag for a container of the present application.

[0034] In summary, this application has the following beneficial effects: 1. This application prepares an outer woven layer and an inner barrier layer by rationally designing different types of resin formulas, thereby forming a liner bag matrix with excellent strength and toughness and forming an effective moisture-proof barrier system inside the liner bag. At the same time, the liner bag of this application can effectively withstand the impact and wear during container transportation.

[0035] 2. The present application sets a first moisture-proof coating and a second moisture-proof coating on the inner and outer sides of the woven layer. The setting of the first moisture-proof coating further improves the wear resistance and durability of the liner bag and reduces the risk of coating cracking. The setting of the second moisture-proof coating significantly improves the moisture-proof barrier performance of the woven layer by adsorbing water molecules and extending the movement path and forward difficulty of water molecules.

[0036] 3. In the present application, a silicon-containing interfacial mixed layer is deposited on the surface of the pretreated bag film by immersion ion implantation using hollow cathode plasma on one side of the barrier layer, i.e., the inner side of the liner bag. The introduction of silicon elements gives the barrier layer the ability to adsorb and desorb moisture molecules. When moisture is released inside the liner bag, it can also effectively adsorb water molecules, thereby playing an internal moisture-proof role and effectively improving the moisture-proof barrier performance of the liner bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the layer structure of a high-efficiency moisture-proof liner bag for containers in the present application.

[0038] Explanation of the accompanying drawings: 1. Braided layer; 11. First moisture-proof coating layer; 12. Second moisture-proof coating layer; 2. Barrier layer; 21. Silicon-containing interface mixed layer. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to preparation examples, embodiments and comparative examples. raw material

[0040] Unless otherwise specified, the raw materials used in the preparation examples, examples and comparative examples in this application are all commercially available products, specifically: HDPE resin, selected from Dushanzi Petrochemical, DMDA-8008H; Methyl silicone resin, selected from Dayi Chemical, VMQ101; LLDPE resin, selected from Exxon, LL6101XR; Polychlorotrifluoroethylene, selected from Jusheng, JS1790; LDPE resin, selected from LyondellBasell, 1800H; Nanosilver, selected from KEPUYIN, J67; Nano titanium dioxide, selected from Klamar, with an average particle size of 100 nm; Water-based polyurethane coating, selected from Baichang, BZ-7; Antioxidant, selected from Kangjin Chemical, antioxidant 1010; Compatibilizer, polyphthalamide, selected from DuPont, 51G35HSL; Antistatic agent, selected from Shandong Juli Antistatic, JL-AS-3; Lubricant, polyethylene wax, selected from Shoucheng, 110; Acrylic modified silicone resin, selected from Jipeng, JP-R03; Water-based EAU acrylic emulsion, selected from Xin Guangli, LA-6166A; Water-based polyurea resin curing agent, selected from Jinwanli, J-6736; Wetting agent, selected from Evonik Digo, Twin4100; Dispersant, selected from BYK, BYK163; Defoaming agent, selected from BYKA500; Film-forming aid, selected from Runtai Chemical, 23812, Nano-silicon dioxide, selected from Manli, ML-SiO2; Graphene oxide, selected from Youmo, YJ-2024.

[0041] Preparation Example of the Second Moisture-Proof Coating

[0042] Preparation Example 1 The second moisture-proof coating, the raw materials and amounts are shown in Table 1, wherein the curing agent is a water-based polyurea resin curing agent.

[0043] Table 1

[0044] The preparation method of the second moisture-proof coating comprises the following steps: S1. The curing agent, wetting agent, dispersant, defoamer, film-forming agent and water are mixed to form a curing component; S2. mixing nano-silica and graphene oxide to form a mixed powder; S3. Evenly mix the acrylic modified silicone resin, water-based EAU acrylic emulsion, curing component and mixed powder to obtain.

[0045] Preparation Example 2-3 The second moisture-proof coating, the difference between Preparation Example 2-3 and Preparation Example 1 is that the raw materials and amounts are as shown in Table 1, and the other steps are the same as Preparation Example 1.

[0046] Preparation Example 4 The second moisture-proof coating differs from Preparation Example 1 in that no nano-silicon dioxide is added, and the nano-silicon dioxide in the raw material is replaced by an equal mass of graphene oxide. The other steps are the same as Preparation Example 1.

[0047] Preparation Example 5 The second moisture-proof coating differs from Preparation Example 1 in that graphene oxide is not added, and the graphene oxide in the raw material is replaced by nano-silicon dioxide of equal mass. The other steps are the same as Preparation Example 1. Example

[0048] A high-efficiency moisture-proof liner bag for containers, such as Figure 1 As shown, it includes a woven layer 1 and an adjacent barrier layer 2, a first moisture-proof coating 11 is provided on one side of the woven layer 1, and a second moisture-proof coating 12 is provided on the other side, the barrier layer 2 is adjacent to the first moisture-proof coating 11 on the side close to the woven layer 1, and a silicon-containing interface mixed layer 21 is provided on the side of the barrier layer 2 away from the woven layer 1. Example 1

[0049] A high-efficiency moisture-proof liner bag for a container comprises an outer woven layer 1 and an inner barrier layer 2. A first moisture-proof coating 11 is provided on one side of the woven layer 1, and a second moisture-proof coating 12 is provided on the other side. The first moisture-proof coating 11 is formed by curing a first moisture-proof coating, which is a water-based polyurethane coating. The second moisture-proof coating 12 is formed by curing a second moisture-proof coating, which is obtained according to Preparation Example 1. The raw materials and amounts of the woven layer 1 are shown in Table 2, and the raw materials and amounts of the barrier layer 2 are shown in Table 3. The antibacterial agent is nanosilver.

[0050] Table 2

[0051] Table 3

[0052] The method for preparing the above-mentioned high-efficiency moisture-proof liner bag for container comprises the following steps: 1. Preparation of braided layer 1: S1: Add HDPE resin, methyl silicone resin, antioxidant, lubricant and antistatic agent into a blender according to the proportion and stir and mix at a speed of 300 rpm / min to obtain a mixture; S2: adding the mixed material to a screw extruder, melt-extruding the film at 280° C., cooling the film with water, and then slitting, stretching, shaping, and winding the film to obtain a spun fiber with a fineness of 1000 deniers; S3: Weaving the spun fibers into a braided layer 1 in a plain weave manner, wherein the braided layer 1 has a warp density of 13 strands / cm and a weft density of 13 strands / cm; 2. Preparation of barrier layer 2: S1: Add LLDPE resin, polytrifluorochloroethylene, LDPE resin, compatibilizer, antibacterial agent and antistatic agent into a blender according to the proportion, stir and mix at 300 rpm / min, then add to a screw extruder, heat to 220°C to melt, extrude into a mold, and then blow mold into a film at 180°C to obtain a bag film; S2: pre-treating and cleaning the bag film surface by argon plasma bombardment cleaning to obtain a pre-treated bag film; S3: The pretreated film was placed on a sample holder in a vacuum chamber of a hollow cathode plasma device, and a plasma immersion ion implantation method was used. 150 sccm of tetramethylsilane and 80 sccm of acetylene were used as a mixed reaction gas. The deposition was performed at a vacuum degree of 8.5 Pa and a voltage of 0.8 kV for 120 min to form a silicon-containing interfacial mixed layer 21 on one side of the pretreated bag film to obtain a barrier layer 2. The thickness of the silicon-containing interfacial mixed layer 21 was 2.31 μm. 3. Apply the first moisture-proof coating and the second moisture-proof coating to both sides of the braided layer 1 respectively. After curing, a first moisture-proof coating 11 and a second moisture-proof coating 12 are formed. The thickness of the first moisture-proof coating 11 is 0.5 mm, and the thickness of the second moisture-proof coating 12 is 0.3 mm. 4. Lay the side of the barrier layer 2 without the silicon-containing interface mixed layer 21 on the side of the braided layer 1 coated with the second moisture-proof coating 12, heat-seal, cut and bond according to a specific size, and obtain the finished product. Example 2

[0053] A high-efficiency moisture-proof liner bag for a container, which differs from Example 1 in that the raw materials and amounts are as shown in Table 2-3, wherein the second moisture-proof coating is obtained from Preparation Example 2; the antibacterial agent is nano-titanium dioxide; The method for preparing the above-mentioned high-efficiency moisture-proof liner bag for container comprises the following steps: 1. Preparation of braided layer 1: S1: Add HDPE resin, methyl silicone resin, antioxidant, lubricant and antistatic agent into a blender according to the proportion and stir at 300 rpm / min to obtain a mixture; S2: adding the mixed material to a screw extruder, melt-extruding a film at 260° C., cooling the film with water, and then slitting, stretching, shaping, and winding to obtain a spun fiber having a fineness of 1200 deniers; S3: Weaving the spun fibers into a braided layer 1 in a plain weave manner, wherein the braided layer 1 has a warp density of 16 strands / cm and a weft density of 16 strands / cm; 2. Preparation of barrier layer 2: S1: Add LLDPE resin, polytrifluorochloroethylene, LDPE resin, compatibilizer, antibacterial agent and antistatic agent into a blender according to the proportion, stir and mix at 300 rpm / min, then add to a screw extruder, heat to 240°C to melt, extrude into a mold, and then blow mold into a film at 200°C to obtain a bag film; S2: pre-treating and cleaning the bag film surface by argon plasma bombardment cleaning to obtain a pre-treated bag film; S3: The pretreated film was placed on a sample holder in a vacuum chamber of a hollow cathode plasma device, and a plasma immersion ion implantation method was used. 250 sccm of tetramethylsilane and 120 sccm of acetylene were used as a mixed reaction gas. The deposition was performed at a vacuum degree of 9.2 Pa and a voltage of 1 kV for 90 min to form a silicon-containing interfacial mixed layer 21 on one side of the pretreated bag film to obtain a barrier layer 2. The thickness of the silicon-containing interfacial mixed layer 21 was 2.21 μm. 3. Apply the first moisture-proof coating and the second moisture-proof coating to both sides of the braided layer 1 respectively. After curing, a first moisture-proof coating 11 and a second moisture-proof coating 12 are formed. The thickness of the first moisture-proof coating 11 is 1 mm, and the thickness of the second moisture-proof coating 12 is 0.1 mm. 4. Lay the side of the barrier layer 2 without the silicon-containing interface mixed layer 21 on the side of the braided layer 1 coated with the second moisture-proof coating 12, heat-seal, cut and bond according to a specific size, and obtain the finished product. Example 3

[0054] A high-efficiency moisture-proof liner bag for a container, which differs from Example 1 in that the raw materials and amounts are as shown in Table 2-3, wherein the second moisture-proof coating is obtained from Preparation Example 3; the antibacterial agent is nanosilver and nanotitanium dioxide in a mass ratio of 1:1; The method for preparing the above-mentioned high-efficiency moisture-proof liner bag for container comprises the following steps: 1. Preparation of braided layer 1: S1: Add HDPE resin, methyl silicone resin, antioxidant, lubricant and antistatic agent into a blender according to the proportion and stir at 300 rpm / min to obtain a mixture; S2: adding the mixed material to a screw extruder, melt-extruding a film at 270° C., cooling the film with water, and then slitting, stretching, shaping, and winding to obtain a spun fiber having a fineness of 1400 denier; S3: Weaving the spun fibers into a braided layer 1 in a plain weave manner, wherein the braided layer 1 has a warp density of 15 strands / cm and a weft density of 15 strands / cm; 2. Preparation of barrier layer 2: S1: Add LLDPE resin, polytrifluoroethylene chloride, LDPE resin, compatibilizer, antibacterial agent and antistatic agent into a blender according to the proportion, stir and mix at 300 rpm / min, then add to a screw extruder, heat to 230°C to melt, extrude into a mold, and then blow mold into a film at 170°C to obtain a bag film; S2: pre-treating and cleaning the bag film surface by argon plasma bombardment cleaning to obtain a pre-treated bag film; S3: The pretreated film is placed on a sample holder in a vacuum chamber of a hollow cathode plasma device, and a plasma immersion ion implantation method is used. 200 sccm of tetramethylsilane and 100 sccm of acetylene are used as a mixed reaction gas. The deposition is performed at a vacuum degree of 8.8 Pa and a voltage of 1 kV for 100 min to form a silicon-containing interfacial mixed layer 21 on one side of the pretreated bag film to obtain a barrier layer 2. The thickness of the silicon-containing interfacial mixed layer 21 is 2.28 μm. 3. Apply the first moisture-proof coating and the second moisture-proof coating to both sides of the braided layer 1 respectively. After curing, a first moisture-proof coating 11 and a second moisture-proof coating 12 are formed. The thickness of the first moisture-proof coating 11 is 0.8 mm, and the thickness of the second moisture-proof coating 12 is 0.2 mm. 4. Lay the side of the barrier layer 2 without the silicon-containing interface mixed layer 21 on the side of the braided layer 1 coated with the second moisture-proof coating 12, heat-seal, cut and bond according to a specific size, and obtain the finished product. Example 4

[0055] A high-efficiency moisture-proof liner bag for a container, which differs from Example 1 in that the raw materials and amounts are as shown in Table 2-3; The method for preparing the above-mentioned high-efficiency moisture-proof liner bag for container comprises the following steps: 1. Preparation of braided layer 1: S1: Add HDPE resin, methyl silicone resin, antioxidant, lubricant and antistatic agent into a blender according to the proportion and stir at 300 rpm / min to obtain a mixture; S2: adding the mixed material to a screw extruder, melt-extruding the film at 280° C., cooling the film with water, and then slitting, stretching, shaping, and winding the film to obtain a spun fiber with a fineness of 1200 deniers; S3: Weaving the spun fibers into a braided layer 1 in a plain weave manner, wherein the braided layer 1 has a warp density of 16 strands / cm and a weft density of 16 strands / cm; 2. Preparation of barrier layer 2: S1: Add LLDPE resin, polytrifluorochloroethylene, LDPE resin, compatibilizer, antibacterial agent and antistatic agent into a blender according to the proportion, stir and mix at 300 rpm / min, then add to a screw extruder, heat to 240°C to melt, extrude into a mold, and then blow mold into a film at 200°C to obtain a bag film; S2: pre-treating and cleaning the bag film surface by argon plasma bombardment cleaning to obtain a pre-treated bag film; S3: The pretreated film is placed on a sample holder in a vacuum chamber of a hollow cathode plasma device, and a plasma immersion ion implantation method is used. 200 sccm of tetramethylsilane and 100 sccm of acetylene are used as a mixed reaction gas. The deposition is performed at a vacuum degree of 9 Pa and a voltage of 1 kV for 120 min to form a silicon-containing interfacial mixed layer 21 on one side of the pretreated bag film to obtain a barrier layer 2. The thickness of the silicon-containing interfacial mixed layer 21 is 2.34 μm. 3. Apply the first moisture-proof coating and the second moisture-proof coating to both sides of the braided layer 1 respectively. After curing, a first moisture-proof coating 11 and a second moisture-proof coating 12 are formed. The thickness of the first moisture-proof coating 11 is 0.6 mm, and the thickness of the second moisture-proof coating 12 is 0.3 mm. 4. Lay the side of the barrier layer 2 without the silicon-containing interface mixed layer 21 on the side of the braided layer 1 coated with the second moisture-proof coating 12, heat-seal, cut and bond according to a specific size, and obtain the finished product. Example 5

[0056] A high-efficiency moisture-proof liner bag for a container is different from Example 1 in that the second moisture-proof coating in step 3 is obtained from Preparation Example 4, and the other steps are the same as Example 1. Example 6

[0057] A high-efficiency moisture-proof liner bag for a container is different from Example 1 in that the second moisture-proof coating in step 3 is obtained from Preparation Example 5, and the other steps are the same as Example 1. Comparative Example

[0058] Comparative Example 1 A high-efficiency moisture-proof liner bag for a container differs from Example 1 in that the first moisture-proof coating is not applied in step 3, and the structure of the final liner bag does not include the first moisture-proof coating 11. The other steps are the same as Example 1.

[0059] Comparative Example 2 A high-efficiency moisture-proof liner bag for a container differs from Example 1 in that the second moisture-proof coating is not applied in step 3, and the structure of the final liner bag does not include the second moisture-proof coating 12. The other steps are the same as Example 1.

[0060] Comparative Example 3 A high-efficiency moisture-proof liner bag for a container differs from Example 1 in that process S3 is not performed in step 2, and the structure of the liner bag finally obtained does not include a silicon-containing interface mixed layer 21. Other steps are the same as Example 1.

[0061] Comparative Example 4 A high-efficiency moisture-proof liner bag for a container differs from Example 1 in that the preparation of the barrier layer 2 in step 2 is not performed, and the structure of the final liner bag does not include the barrier layer 2. The other steps are the same as those in Example 1. Performance testing

[0062] The following relevant performance test tests were performed on the high-efficiency moisture-proof liner bags for containers obtained in Examples 1-6 and Comparative Examples 1-4. Each group of relevant tests was performed 3 times, and the average value of the 3 tests was taken as the final result and the final result was recorded in Table 4.

[0063] 1. Water Vapor Transmission Rate: Referring to the standard requirements and methods of GB / T 16928-1997, the high-efficiency moisture-proof container liner bags obtained in Examples 1-6 and Comparative Examples 1-4 were tested for water vapor transmission rate performance using a water vapor transmission rate tester.

[0064] 2. Oxygen Transmission Rate: With reference to the standard requirements and methods of GB / T 1038-2022, the high-efficiency moisture-proof liner bags for containers obtained in Examples 1-6 and Comparative Examples 1-4 were tested for oxygen transmission rate performance. The unit is cm 3 / (m 2 ·24h·0.1MPa).

[0065] 3. Antibacterial rate: Referring to the standard requirements and methods of QB / T 2591-2003, the high-efficiency moisture-proof liner bags for containers obtained in Examples 1-6 and Comparative Examples 1-4 were tested for their antibacterial rate.

[0066] 4. Tensile properties: Referring to the standard requirements and methods of Q / 370282HX003-2019, the high-efficiency moisture-proof liner bags for containers obtained in Examples 1-6 and Comparative Examples 1-4 were subjected to performance testing of tensile properties.

[0067] Table 4

[0068] The performance test results in Table 4 show that the high-efficiency moisture-proof container liner bag of the present application has excellent moisture-proof performance and barrier properties against the external environment. When using the liner bag to transport goods through a container, it can effectively prevent moisture from the internal and external environments of the container from penetrating into the liner bag and causing damage to the goods, thereby ensuring the quality of the goods. The high-efficiency moisture-proof container liner bag of the present application has excellent tensile strength and good durability. It can maintain higher strength when bearing weight and impact forces during transportation, reducing the risk of damage and preventing external adverse factors from entering the bag and damaging the goods due to damage to the liner bag itself.

[0069] Performance testing results for Examples 1-4 and Comparative Examples 1-4 demonstrate that the barrier layer significantly enhances the liner's water-resistant barrier properties. The silicon-containing interfacial hybrid layer, through its introduction of silicon, imparts moisture adsorption and desorption capabilities to the barrier layer. This effectively adsorbs moisture even when released from within the liner, providing internal moisture protection and effectively enhancing the liner's moisture-resistant barrier properties.

[0070] The setting of the first moisture-proof coating further improves the tensile strength and durability of the liner bag. The setting of the second moisture-proof coating significantly improves the moisture-proof barrier and antibacterial properties of the woven layer through the physical and chemical effects produced by graphene oxide and nano-silicon dioxide.

[0071] Performance testing results from Examples 1-4 and 5-6 demonstrate that the introduction of graphene oxide and nano-silicon dioxide into the second moisture-proof coating effectively enhances the liner's moisture barrier properties through the graphene oxide's sheet structure's resistance to the movement of water and air molecules and the nano-silicon dioxide's moisture adsorption. Furthermore, the graphene oxide nanosheets can interact with bacterial cell membranes, physically disrupting them and ultimately destroying the bacterial cell structure, leading to their death and further enhancing the liner's antibacterial properties.

[0072] The addition of graphene oxide also improves the mechanical strength and toughness of the woven layer, further enhancing the liner bag's ability to resist external pressure and wear, thereby reducing the risk of water molecule penetration caused by damage to the liner bag.

[0073] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing a high-efficiency moisture-proof liner bag for a container, characterized in that: The following steps are involved: An outer braided layer (1) and an inner barrier layer (2) are prepared, and a silicon-containing interface mixed layer (21) is provided on one side of the barrier layer (2); preparing a first moisture-proof coating and a second moisture-proof coating, coating the first moisture-proof coating and the second moisture-proof coating on both sides of the braided layer (1) respectively, and forming a first moisture-proof coating (11) and a second moisture-proof coating (12) after curing; The side of the barrier layer (2) without the silicon-containing interface mixed layer (21) is laminated to the side of the braided layer (1) coated with the second moisture-proof coating (12), and the two layers are heat-sealed and then cut and bonded to a specific size to obtain the product.

2. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 1, characterized in that: In parts by weight, the raw materials of the braided layer (1) include 31-41 parts of HDPE resin, 14-21 parts of methyl silicone resin and 0.3-0.6 parts of lubricant; The raw materials of the barrier layer (2) include 37-51 parts of LLDPE resin, 15-23 parts of polychlorotrifluoroethylene, 8-12 parts of LDPE resin and 0.5-1.5 parts of antibacterial agent.

3. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 2, characterized in that: The method for preparing the braided layer (1) comprises the following steps: S1: mixing HDPE resin, methyl silicone resin, lubricant and other raw materials in a proportion to obtain a mixture; S2: The mixture is melt-extruded at 260-280° C. to form a film, and the film is cooled, slit, stretched, shaped, and wound to obtain a spun fiber having a fineness of 1000-1400 denier; S3: Weaving the spun fibers into a woven layer (1) in a plain weave manner, wherein the warp density of the woven layer (1) is 13-16 strands / cm, and the weft density is 13-16 strands / cm.

4. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 2, characterized in that: The method for preparing the barrier layer (2) comprises the following steps: S1: LLDPE resin, polytrifluorochloroethylene, LDPE resin and antibacterial agent are mixed uniformly according to the ratio, melted at 220-240°C, extruded into a mold, and then blown into a film at 170-200°C to obtain a bag film; S2: pre-treating the bag film surface by argon plasma bombardment cleaning to obtain a pre-treated bag film; S3: By plasma immersion ion implantation, 150-250 sccm of tetramethylsilane and 80-120 sccm of acetylene are used as mixed reaction gases, and deposition is performed at a vacuum degree of 8.5-9.2 Pa and a voltage of 0.8-1 kV for 90-120 minutes to form a silicon-containing interface mixed layer (21) on one side of the pretreated bag film.

5. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 1, characterized in that: The first moisture-proof coating (11) is formed by curing a first moisture-proof paint, and the first moisture-proof paint is a water-based polyurethane paint.

6. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 1, characterized in that: The second moisture-proof coating (12) is formed by curing a second moisture-proof paint. The raw materials of the second moisture-proof paint include, by weight, 37-42 parts of acrylic modified silicone resin, 12-16 parts of water-based EAU acrylic emulsion, 5.5-6.5 parts of curing agent, 0.1-0.2 parts of wetting agent, 0.1-0.2 parts of dispersant, 0.1-0.2 parts of defoaming agent, 0.3-0.6 parts of film-forming aid, 3-5 parts of nano-silicon dioxide, 6-8 parts of graphene oxide and 12.5-16.5 parts of water.

7. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 6, characterized in that: The curing agent is a water-based polyurea resin curing agent.

8. The method for preparing a high-efficiency moisture-proof liner bag for a container according to claim 1, characterized in that: The thickness of the first moisture-proof coating (11) is 0.5-1 mm, and the thickness of the second moisture-proof coating (12) is 0.1-0.3 mm.

9. A high-efficiency moisture-proof liner bag for a container, characterized in that: The container-use moisture-proof liner bag is prepared by the method for preparing the high-efficiency moisture-proof liner bag for containers according to any one of claims 1 to 8.

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