Heat insulation waterproof high strength packaging bag and manufacturing process for the same

Abstract

To provide a packaging bag with good heat insulation and water proof properties, high strength, resistance to wrinkles, deformation and breakage, good protection for an article, and wide application range.SOLUTION: A heat insulation, water proof, and high strength packaging bag is made of a composite paper, the composite paper includes: an outer water proof layer; an outer paper layer; a first adhesive layer; a heat insulation buffer layer; a second adhesive layer; an inner paper layer; and an inner water proof layer, which are installed in this order, and the first adhesive layer and the second adhesive layer are elastic adhesive layers. The manufacturing process includes bonding the first adhesive layer to the insulation buffer layer, then bonding the outer paper layer, holding the temperature and drying, bonding the second adhesive layer to the insulation buffer layer, then bonding the outer paper layer, holding the temperature and drying, applying a water proof agent to the outer paper layer and the inner paper layer, respectively, forming the outer water proof layer and the inner water proof layer, drying, producing the composite paper, cutting the composite paper, and combining there.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application relates to the field of packaging materials. More specifically, it relates to a heat-insulating, waterproof and high-strength packaging bag and its manufacturing process.

Background Art

[0002] Packaging bags are used for packaging articles. Different types of articles need to use packaging bags with different required functions.

[0003] In order to improve the environmental protection and recyclability of packaging bags, recyclable papers such as kraft paper and cardboard are generally used to make packaging bags. Currently, ordinary environmentally friendly packaging bags can be divided into the following several types. The first type is a packaging bag made of single-layer kraft paper. Such a packaging bag has the advantage of being lightweight, but its heat-insulating performance, waterproof performance and pressure resistance are all low. The second type is a packaging bag made of composite cardboard. Such a packaging bag has good pressure resistance, but its heat-insulating and waterproof properties are ordinary. The third type is a packaging bag made by laminating kraft paper and heat-insulating foam. Such a packaging bag has good heat-insulating performance, but it is not environmentally friendly, and during transportation, wrinkles and damage are likely to occur on the packaging bag, and its waterproof property is also low, reducing the protective performance for articles. Therefore, there is a need to further improve the current environmentally friendly packaging bags.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to solve the problems that the current environmentally friendly packaging bags have low heat-insulating and waterproof performances, are prone to wrinkles and damage during transportation, and the protective performance for articles is reduced, this application provides a heat-insulating, waterproof and high-strength packaging bag and its manufacturing process.

Means for Solving the Problems

[0005] In a first aspect, the present application provides a heat-insulating, waterproof and high-strength packaging bag, and adopts the following technical solutions.

[0006] A heat-insulating, waterproof and high-strength packaging bag, which is made of composite paper, and the composite paper includes an outer waterproof layer, an outer paper layer, a heat-insulating buffer layer, an inner paper layer and an inner waterproof layer that are sequentially laminated. The outer paper layer and the heat-insulating buffer layer are laminated by a first adhesive layer, the inner paper layer and the heat-insulating buffer layer are laminated by a second adhesive layer, and both the first adhesive layer and the second adhesive layer are elastic adhesive layers.

[0007] By adopting the above technical solutions, the packaging bag of the present application is manufactured by combining composite paper. Among them, the inner paper layer and the outer paper layer play a role in improving the supportability of the packaging bag, improving the pressure resistance strength of the packaging bag, making the packaging bag not easily damaged. The heat-insulating buffer layer can block the internal and external air flow, play a good heat-insulating and heat-preserving effect, and also have a good buffering effect. When the packaging bag receives external pressure, wrinkles and damage are not likely to occur, improving the protective effect on the packaged items. The outer waterproof layer and the inner waterproof layer have a waterproof effect, further block moisture and air flow, and further improve the waterproof and heat-insulating properties of the packaging bag. The first adhesive layer plays a role in laminating the outer paper layer and the heat-insulating buffer layer, and the second adhesive layer plays a role in laminating the inner paper layer and the heat-insulating buffer layer. The first adhesive layer and the second adhesive layer are installed as elastic adhesive layers and can cooperate with the heat-insulating buffer layer. When the packaging bag receives external pressure, due to the action of the outer paper layer, the heat-insulating buffer layer and the inner paper layer, it evenly disperses and repels the external pressure, reducing the problem that the inner paper layer and the outer paper layer are likely to wrinkle, improving the pressure resistance strength of the packaging bag, and making the packaging bag not easily damaged.

[0008] Preferably, a first buffer structure is provided on one side of the outer waterproof layer close to the heat-insulating buffer layer, and a second buffer structure is provided on one side of the inner waterproof layer close to the heat-insulating buffer layer. The first buffer structure and the second buffer structure are the same, and the first buffer structure and the second buffer structure are symmetrically installed.

[0009] By adopting the above technical solution, the first buffer structure and the second buffer structure are symmetrically arranged, and the structures of the first buffer structure and the second buffer structure are the same. When the packaging bag receives external pressure, the first buffer structure of the outer paper layer and the second buffer structure of the inner paper layer cooperate with the heat insulation buffer layer, and the surface of the packaging bag uniformly buffers and rebounds against the external pressure, further improving the pressure resistance performance of the packaging bag and reducing the occurrence of wrinkles and damages on the packaging bag.

[0010] Preferably, the first buffer structure is composed of several convex portions, and the horizontal height of the convex portions gradually increases along the middle region to the peripheral edge region of the outer paper layer.

[0011] By adopting the above technical solution, the horizontal height of the convex portion near the middle region of the outer paper layer is low, and the horizontal height of the convex portion near the peripheral edge region of the outer paper layer is high. The thickness of the first adhesive layer between the middle region of the outer paper layer and the heat insulation buffer layer is increased, and the thickness of the first adhesive layer between the peripheral edge region of the outer paper layer and the heat insulation buffer layer is decreased. The middle region of a general packaging bag is easily pressed and wrinkled. Therefore, the first adhesive layer and the heat insulation buffer layer corresponding to the middle region of the outer paper layer play a good cooperative role, generate a buffering effect on the middle region of the outer paper layer, disperse the pressing action that the outer paper layer is about to receive to the surrounding, improve the pressure resistance strength of the packaging bag, and further make the packaging bag less likely to wrinkle and less likely to be damaged.

[0012] Furthermore, the horizontal height of the convex portion in the middle region of the outer paper layer in the present application is 1 / 3 to 3 / 4 of the height of the outer paper layer. While the outer paper layer has good isolation performance, it also has better buffering elasticity, reducing the occurrence of wrinkles and damages on the packaging bag.

[0013] Preferably, the distribution density of the convex portions gradually decreases along the middle region to the peripheral edge region of the outer paper layer.

[0014] By adopting the above technical solution, the middle region of the packaging bag is prone to wrinkles when pressed from the outside. Therefore, by increasing the distribution density of the convex portions in the middle region of the outer paper layer, the pressure can be evenly dispersed, reducing the occurrence of wrinkles and damage. The first buffer structure forms a cooperative effect with the first adhesive layer and the heat insulation buffer layer to evenly disperse and release the pressure. In the process of combining the edge region of the packaging bag, the packaging bag itself needs to have wrinkles. Therefore, the thickness of the peripheral edge region of the outer paper layer is controlled to be thick, making it easy to shape and enabling the packaging bag to maintain a three-dimensional shape, having buffer performance and being difficult to deform.

[0015] Preferably, the heat insulation buffer layer is any one of aerogel cotton, silicone cotton, and urethane.

[0016] By adopting the above technical solution, the heat insulation buffer layer has excellent heat insulation and buffer elasticity, and can improve the heat preservation and buffer performance of the manufactured packaging bag.

[0017] Preferably, both the first adhesive layer and the second adhesive layer are formed by curing with an adhesive, and the adhesive is 40 - 60 parts of polyurethane emulsion 12 - 22 parts of thickener 4 - 8 parts of wetting agent 0.5 - 2 parts of long-chain alkyl silane coupling agent prepared from raw materials in parts by weight of 20 - 30 parts of water.

[0018] By adopting the above technical solution, the compressive strength and wrinkle resistance performance of the manufactured heat-insulating, waterproof and high-strength packaging bag are further improved, and in order to realize the bonding stability between multiple layers, the adhesive of the present application is used. The adhesive of the present application uses polyurethane emulsion as the resin body. The polyurethane emulsion has good adhesion and has good elasticity and toughness after curing. The thickener plays a role in improving adhesiveness, can support the polyurethane emulsion, and further improves the adhesiveness of the prepared adhesive. The wetting agent can generate a good synergistic effect with the thickener, improves the uniform dispersion performance on the surface of the heat-insulating buffer layer of the prepared adhesive, can uniformly infiltrate and disperse in the gap between the first buffer structure and the second buffer structure, and can stably bond the outer paper layer, the heat-insulating buffer layer and the inner paper layer. The long-chain alkyl silane coupling agent has a long carbon chain and can further improve the dispersion stability between the polyurethane emulsion, the thickener and the wetting agent. Thereby, the prepared adhesive has good adhesive stability and elasticity after curing.

[0019] Preferably, the thickener is Calculated by parts by weight, 10 to 18 parts of starch are added to 80 to 120 parts of water, 0.3 to 0.8 parts of 1 to 2 mol / L hydrochloric acid aqueous solution are added dropwise, the temperature is raised to 65 to 85 °C, and stirred for 30 to 60 min to prepare starch hydrolyzate in step A1, and 0.2 to 0.5 parts of diethylene glycol, 0.1 to 0.3 parts of acrylate copolymer and 1 to 3 parts of magnesium aluminum silicate are added to the starch hydrolyzate, stirred uniformly, and prepared by step A2 of preparing a thickener.

[0020] By adopting the above technical solution, first, starch is hydrolyzed under acidic conditions to loosen and stably disperse the molecular structure of starch, improve the water absorption and swelling effects of starch, enhance the supporting effect on the polyurethane emulsion, and then diethylene glycol, an acrylate copolymer, and magnesium aluminum silicate are added and formulated with the starch hydrolyzate. Diethylene glycol has a flexible long-chain ether chain segment and can improve the dispersibility of the acrylate copolymer and magnesium aluminum silicate in the starch hydrolyzate. The addition of the acrylate copolymer and magnesium aluminum silicate can further improve the fluidity and adsorption performance of the starch hydrolyzate. The prepared thickener can stably adsorb onto the polyurethane emulsion and has good adhesion stability.

[0021] Preferably, the wetting agent is composed of oleylamine polyoxyethylene ether and polyvinyl alcohol, and the weight ratio of oleylamine polyoxyethylene ether to polyvinyl alcohol is 1:(0.2 - 0.6).

[0022] By adopting the above technical solution, a suitable ratio of oleylamine polyoxyethylene ether and polyvinyl alcohol has a good synergistic effect, can improve the wettability and adhesion performance of the prepared adhesive, and further improve the adhesion stability between the outer paper layer, heat insulation buffer layer, and inner paper layer of the packaging bag.

[0023] Preferably, the adhesive is prepared by step B1 of adding the wetting agent to water and stirring uniformly to prepare a mixed solution, and step B2 of adding a polyurethane emulsion, a thickener, and a long-chain alkyl silane coupling agent to the mixed solution and stirring uniformly to prepare the adhesive.

[0024] By adopting the above technical solution, first, the sizing agent is dissolved in water to form a mixed solution that is uniformly dispersed. Under the action of the sizing agent, the polyurethane emulsion, thickening agent, and long-chain alkyl silane coupling agent are uniformly dispersed, and an adhesive with a stable system and excellent adhesion performance is prepared.

[0025] In a second aspect, the present application provides a manufacturing process for a heat-insulating, waterproof, and high-strength packaging bag, and adopts the following technical solutions.

[0026] A manufacturing process for a heat-insulating, waterproof, and high-strength packaging bag, comprising: Step S1 of applying an adhesive to one side of the heat-insulating buffer layer to form a first adhesive layer, then laminating an outer paper layer, heat-insulating, and drying; Step S2 of applying an adhesive to the side of the heat-insulating buffer layer away from the outer paper layer to form a second adhesive layer, then laminating an outer paper layer, heat-insulating, and drying; Step S3 of applying a waterproof agent to the inner paper layer to form an inner waterproof layer, applying a waterproof agent to the outer paper layer to form an outer waterproof layer, drying, and manufacturing a composite paper; S4 of cutting and combining the composite paper to manufacture a heat-insulating, waterproof, and high-strength packaging bag.

[0027] By adopting the above technical solution, a packaging bag with excellent heat-insulating performance, excellent waterproof performance, and being resistant to wrinkles, deformation, and damage is manufactured.

Advantages of the Invention

[0028] As described above, the present application has the following beneficial effects.

[0029] 1. The heat-insulating, waterproof, and high-strength packaging bag of the present application is composed of an outer waterproof layer, an outer paper layer, a first adhesive layer, a heat-insulating buffer layer, a second adhesive layer, an inner paper layer, and an inner waterproof layer. It has good heat-insulating performance and waterproof performance, is resistant to wrinkles, deformation, and damage, has a good protective effect on the packaged items, and has a wide range of applications.

[0030] 2. By installing a first buffer structure on one side close to the heat insulation buffer layer of the outer waterproof layer and a second buffer structure on one side close to the heat insulation buffer layer of the inner waterproof layer, the structures of the first buffer structure and the second buffer structure are the same. The first buffer structure is composed of a plurality of protruding parts. The horizontal height of the protruding parts gradually increases from the middle region to the peripheral edge region of the outer paper layer, and the distribution density of the protruding parts gradually decreases from the middle region to the peripheral edge region of the outer paper layer. The thickness of the first adhesive layer between the middle region of the outer paper layer and the heat insulation buffer layer is increased, while the thickness of the first adhesive layer between the peripheral edge region of the outer paper layer and the heat insulation buffer layer is decreased. When the packaging bag receives external pressure, the outer paper layer, the first adhesive layer, the heat insulation buffer layer, the second adhesive layer and the inner paper layer form a cooperative structure, which can evenly disperse the pressure, reduce the occurrence of wrinkles and damage. The edge region of the packaging bag needs to wrinkle itself during the combination process. Therefore, the thickness of the peripheral edge region of the outer paper layer is controlled to be thick, which is easy to shape and can keep the packaging bag in a three-dimensional shape. It has buffer performance and is not easy to deform.

[0031] 3. Prepare an adhesive using polyurethane emulsion, thickener, wetting agent, long-chain alkyl silane coupling agent and water. Among them, the thickener is composed of starch, diethylene glycol, acrylic ester copolymer and magnesium aluminum silicate, and the wetting agent is composed of oleylamine polyoxyethylene ether and polyvinyl alcohol. The thickener and the wetting agent produce a good synergistic effect and stably adsorb the polyurethane emulsion. The prepared adhesive has good adhesion stability. The first adhesive layer and the second adhesive layer formed after curing have good elasticity, which can further improve the strength and buffer performance of the packaging bag.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying out the Invention

[0033] Hereinafter, the present application will be described in more detail with reference to Drawings 1 to 3 and Examples.

[0034] The following are the sources and specifications of some raw materials of the present application. The raw materials in the preparation examples and examples of the present application can all be obtained commercially. The raw materials used in the present application include, but are not limited to, the specific model numbers and manufacturers disclosed below. Raw materials having the same specification parameters and performance can all be used. 1. Regarding starch, corn starch, industrial grade, with a content of 99%. 2. Regarding the acrylate copolymer, Carbomer U21, under the brand name Lubrizol. 3. Regarding magnesium aluminum silicate, 325 mesh, with a content of 99%, pH = 6.3, and whiteness of 90%. 4. Regarding kaolin, kaolin is calcined, 325 mesh, with a density of 2.54 - 2.60 g / cm 3 and 5. Regarding the polyurethane emulsion, under the brand name Bayer, with a content of 40 - 50%, a viscosity of 700 - 1500 mPa·s at 25 °C, pH = 7 - 9, and a density of 1.04 - 1.09 g / cm 3 and 6. Regarding oleylamine polyoxyethylene ether, it is oleylamine polyoxyethylene (2) ether. 7. Regarding polyvinyl alcohol, with a molecular weight of 25,000 - 35,000 daltons, a content of 99%, and pH = 4.5 - 6.5.

[0035] Regarding the preparation example of the thickener Preparation Example 1 Preparation Example 1 discloses a thickener and is prepared by the following steps. In A1, 1 kg of starch was added to 8 kg of water, 0.03 kg of 1 mol / L hydrochloric acid aqueous solution was added dropwise, the temperature was raised to 65 °C, and stirred for 30 min to prepare a starch hydrolyzate. In A2, 0.02 kg of diethylene glycol, 0.01 kg of carbomer U21 and 0.1 kg of magnesium aluminum silicate were added to the starch hydrolyzate, and stirred for 20 min under the condition that the stirring speed was 300 r / min to prepare a thickener.

[0036] Preparation Examples 2 to 3 The differences between Preparation Examples 2 to 3 and Preparation Example 1 are that the raw material usage amounts and preparation conditions are different. Specifically, refer to Table 1 below.

[0037] JPEG2025113954000002.jpg125162

[0038] Preparation Comparative Example 1 The difference between Preparation Comparative Example 1 and Preparation Example 1 is that diethylene glycol is replaced with the same amount of polyethylene glycol 400, and the others are the same as Preparation Example 1.

[0039] Preparation Comparative Example 2 The difference between Preparation Comparative Example 2 and Preparation Example 1 is that magnesium aluminum silicate is replaced with the same amount of kaolin, and the others are the same as Preparation Example 1.

[0040] Preparation Comparative Example 3 The difference between Preparation Comparative Example 3 and Preparation Example 1 is that carbomer U21 is replaced with the same amount of hydroxyethyl methylcellulose, and the others are the same as Preparation Example 1.

[0041] Preparation Comparative Example 4 The difference between Preparation Comparative Example 4 and Preparation Example 1 is that magnesium aluminum silicate is replaced with the same amount of carbomer U21, and the others are the same as Preparation Example 1.

[0042] Preparation Examples of Adhesives Preparation Example 4 Preparation Example 4 discloses an adhesive, which is prepared in the following steps: In B1, 0.4 kg of polyvinyl alcohol was added to 2 kg of water as a wetting agent, and stirred for 20 min at a temperature of 60 °C and a stirring speed of 300 r / min to prepare a homogeneous mixture. In B2, 4 kg of polyurethane emulsion, 1.2 kg of hydroxyethyl methyl cellulose as a thickener, and 0.05 kg of dodecyltrimethoxysilane as a silane coupling agent were added to the mixture, and stirred for 30 min at a stirring speed of 500 r / min to prepare a homogeneous adhesive.

[0043] Preparation Examples 5 - 6 The differences between Preparation Examples 5 - 6 and Preparation Example 1 are the raw material usage amounts and preparation conditions. Specifically, refer to Table 2 below.

[0044] JPEG2025113954000003.jpg171157

[0045] Preparation Examples 7 - 13 The differences between Preparation Examples 7 - 13 and Preparation Example 4 are the sources of the thickener. Specifically, refer to Table 3 below.

[0046] JPEG2025113954000004.jpg86145

[0047] Preparation Example 14 The difference between Preparation Example 14 and Preparation Example 7 is the wetting agent. The wetting agent in Preparation Example 14 is composed of oleylamine polyoxyethylene ether and polyvinyl alcohol, with the usage amount of oleylamine polyoxyethylene ether being 0.33 kg and that of polyvinyl alcohol being 0.07 kg. Otherwise, it is the same as Preparation Example 7.

[0048] Preparation Example 15 The difference between Preparation Example 15 and Preparation Example 7 is that the wetting agent in Preparation Example 15 is composed of oleylamine polyoxyethylene ether and polyvinyl alcohol, the usage amount of oleylamine polyoxyethylene ether is 0.25 kg, and the usage amount of polyvinyl alcohol is 0.15 kg. Otherwise, it is the same as Preparation Example 7.

[0049] Preparation Comparative Example 5 The difference between Preparation Comparative Example 5 and Preparation Example 7 is that the long-chain alkylsilane coupling agent is replaced with the same amount of methyltriethoxysilane coupling agent. Otherwise, it is the same as Preparation Example 14.

[0050] (Example 1) Example 1 discloses a heat-insulating, waterproof and high-strength packaging bag, which is manufactured by cutting and combining composite paper. Referring to FIG. 1, the composite paper includes an outer waterproof layer, an outer paper layer, a heat-insulating buffer layer, an inner paper layer and an inner waterproof layer which are sequentially laminated. The outer paper layer and the heat-insulating buffer layer are laminated through a first adhesive layer, the inner paper layer and the heat-insulating buffer layer are laminated through a second adhesive layer, the outer waterproof layer and the inner waterproof layer are PE waterproof layers, the outer paper layer and the inner paper layer are both kraft papers, the thickness of the kraft paper is 0.1 - 1 mm, and the thickness of the kraft paper in this example is 0.5 mm. The heat-insulating buffer layer is aerogel cotton, silicone cotton, urethane, etc. The heat-insulating buffer layer in this example is silicone cotton, the thickness of the heat-insulating buffer layer is 0.1 - 2 mm, and the thickness of the heat-insulating buffer layer in this example is 1 mm. The first adhesive layer and the second adhesive layer are both elastic adhesive layers, which are prepared by curing the adhesive.

[0051] The heat-insulating, waterproof and high-strength packaging bag is manufactured through the following steps: In S1, a commercially available adhesive is applied to one side of the heat-insulating buffer layer, and the application amount is controlled to 30 g / m 2 to form the first adhesive layer, and then the outer paper layer is laminated, kept warm at 40 °C for 20 min, and then dried at 100 °C. In S2, a commercially available adhesive is applied to the side of the heat-insulating buffer layer away from the outer paper layer, and the application amount is 30 g / m2 Control it to form a second adhesive layer, then laminate the outer paper layer, keep it warm at 40°C for 20 minutes, and then dry it at 100°C. In S3, melt the PE material to form a PE waterproof agent, cast and coat it on the inner paper layer to form an inner waterproof layer, coat the PE waterproof agent on the outer paper layer to form an outer waterproof layer, and control the coating amount of the PE waterproof agent to 10 g / m 2 Control it, dry it at 20°C, with a drying time of 30 minutes, and manufacture the composite paper. In S4, cut and combine the composite paper to manufacture a heat-insulating, waterproof and high-strength packaging bag. Among them, for the commercially available adhesive, it is an aqueous polyurethane adhesive, with the brand of Dibang Nano-Technology, having a viscosity of 100 - 450 cps at 25°C, a solid content of 40%, and a pH of 7.0 - 8.5. For the PE material, it is low-density polyethylene, with the brand of Dow Chemical and the model number of 4203. For the aerogel cotton, the thermal conductivity is 0.02 W / (m·K), the pressure resistance is 18 MPa, and the density is 180 - 220 kg / m 3 Yes. For the silicone cotton, the thermal conductivity is 0.02 W / (m·K), and the density is 120 - 160 kg / m 3 Yes. For the urethane, it is EPE foam cotton, with the thermal conductivity of 0.02 W / (m·K) and the density of 28 - 35 kg / m 3 Yes.

[0052] (Examples 2 - 3) The differences between Examples 2 - 3 and Example 1 are that the manufacturing process parameters are also different and the origin of the adhesive is different. Specifically, refer to Table 4 below.

[0053] JPEG2025113954000005.jpg165159

[0054] (Example 4) The difference between Example 4 and Example 1 is as follows. Referring to FIG. 2, the structure of the composite paper is different. One side of the outer waterproof layer close to the heat insulation buffer layer has a first buffer structure, and one side of the inner waterproof layer close to the heat insulation buffer layer has a second buffer structure. The first buffer structure and the second buffer structure are symmetrically installed. Among them, the first buffer structure is composed of several protruding parts, and the horizontal height of the protruding parts gradually increases from the middle region of the outer paper layer to the peripheral edge region. The first buffer structure and the second buffer structure are the same, and the distribution density of the protruding parts is the same. Otherwise, it is the same as Example 1.

[0055] (Example 5) The difference between Example 5 and Example 4 is as follows. Referring to FIG. 3, on the basis of Example 4, the distribution density of the protruding parts gradually decreases from the middle region of the outer paper layer to the peripheral edge region, and the distribution density of the protruding parts of the inner paper layer is the same as that of the outer paper layer. Otherwise, it is the same as Example 4.

[0056] (Examples 6 - 18) The difference between Examples 6 - 18 and Example 5 is that the origin of the adhesive is different. Specifically, refer to Table 5 below.

[0057] JPEG2025113954000006.jpg164138

[0058] Performance Detection Test Next, performance tests are performed on the heat - insulating, waterproof and high - strength packaging bags manufactured in Examples 1 - 18. (1) Crease Resistance Test Based on the test method in GB / T 13024 - 2003, the crease resistance (unit: times) of the heat - insulating, waterproof and high - strength packaging bags is tested, and the detection results are detected and recorded. (2) Bursting Strength Test Based on the test method in GB / T 13024 - 2003, the bursting index (unit: kPa·m 2 / g) of the heat - insulating, waterproof and high - strength packaging bags is tested, and the detection results are detected and recorded. (3) Peel Strength Test Refer to the test method in GB / T 34444-2017, test the peel strength (unit: N / cm) of the heat-insulating and waterproof high-strength packaging bag, detect and record the detection results. The following are the performance test data of the heat-insulating and waterproof high-strength packaging bags manufactured in Examples 1 to 18. Specifically, refer to Table 6 below.

[0059] JPEG2025113954000007.jpg145165

[0060] As can be seen by referring to Table 6 with reference to Examples 1 to 5, the first buffer structure of the outer paper layer and the second buffer structure of the inner paper layer of the present application can cooperate with the heat-insulating buffer layer to improve the strength of the manufactured packaging bag, the interlayer adhesion is more stable, and wrinkles and deformations are less likely to occur. The convex portions in Example 2 are uniformly distributed, while the convex portions in Example 3 have a decreasing distribution density in order from the central region to the peripheral edge region. As can be seen from the data, the peel strength in Example 2 is slightly greater than that in Example 3. Using convex portions with uniform distribution may be more advantageous for lamination. However, the folding resistance and burst index in Example 2 are both significantly greater than those in Example 3. The difference in the distribution density of the convex portions can improve the strength of the manufactured packaging bag. Overall, the performance of the packaging bag in Example 3 is better.

[0061] As can be seen by referring to Table 6 with reference to Examples 1 to 5 and Examples 6 to 15, the adhesive stability of the adhesive prepared using the thickener of the present application can be further improved, and the strength of the manufactured packaging bag can be improved. However, in Examples 12 to 15, starch, diethylene glycol, carbomer U21, and magnesium aluminum silicate were not used in the formulation, resulting in a decrease in the strength of the manufactured packaging bag and a decrease in folding resistance. Starch, diethylene glycol, carbomer U21, and magnesium aluminum silicate produce a good synergistic effect, explaining that the strength of the manufactured packaging bag is good.

[0062] As can be seen by referring to Table 6 with reference to Examples 9 to 11 and Examples 16 to 17, when oleylamine polyoxyethylene ether and polyvinyl alcohol in a suitable ratio of the present application are formulated and used, a good synergistic effect with the thickener can be generated, and further, the adhesive stability between the layers of the packaging bag can be improved, and the strength of the produced packaging bag can be improved.

[0063] As can be understood by referring to Table 6 with reference to Examples 16 to 17 and Example 18, the strength of the packaging bag produced using a long-chain alkyl silane coupling agent can be improved.

[0064] In summary, in the present application, a composite paper is formed by laminating an outer waterproof layer, an outer paper layer, a first adhesive layer, a heat insulation buffer layer, a second adhesive layer, an inner paper layer, and an inner waterproof layer. The packaging bag produced from this composite paper has good heat preservation performance, waterproof performance, and strength. Moreover, it is cured using the adhesive of the present application to form the first adhesive layer and the second adhesive layer, which have good elasticity and adhesiveness, and are less likely to wrinkle and deform after receiving external pressure. Furthermore, the buffer performance and strength of the produced packaging bag are improved.

[0065] This specific embodiment is merely for explaining the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications without creative contributions to this embodiment as needed, but as long as they are within the scope of the claims of the present application, they will all be protected by the patent law.

Explanation of Reference Signs

[0066] 1... outer waterproof layer, 2... outer paper layer, 21... first buffer structure, 3... first adhesive layer, 4... heat insulation buffer layer, 5... second adhesive layer, 6... inner paper layer, 61... second buffer structure, 7... inner waterproof layer.

Claims

1. Manufactured from composite paper, the composite paper includes an outer waterproof layer, an outer paper layer, a heat insulation and buffer layer, an inner paper layer, and an inner waterproof layer that are sequentially laminated. The outer paper layer and the heat insulation and buffer layer are laminated by a first adhesive layer, and the inner paper layer and the heat insulation and buffer layer are laminated by a second adhesive layer. Both the first adhesive layer and the second adhesive layer are elastic adhesive layers. A heat preservation, waterproof and high-strength packaging bag characterized by this.

2. It has a first buffer structure on one side close to the heat insulation and buffer layer of the outer waterproof layer, and a second buffer structure on one side close to the heat insulation and buffer layer of the inner waterproof layer. The first buffer structure and the second buffer structure are the same, and the first buffer structure and the second buffer structure are symmetrically installed. The heat preservation, waterproof and high-strength packaging bag according to claim 1, characterized by this.

3. The first buffer structure is composed of several protruding parts, and the horizontal height of the protruding parts gradually increases from the middle region to the peripheral edge region of the outer paper layer. The heat preservation, waterproof and high-strength packaging bag according to claim 2, characterized by this.

4. The distribution density of the protruding parts gradually decreases from the middle region to the peripheral edge region of the outer paper layer. The heat preservation, waterproof and high-strength packaging bag according to claim 3, characterized by this.

5. The heat insulation and buffer layer is any one of aerogel cotton, silicone cotton, and urethane. The heat preservation, waterproof and high-strength packaging bag according to claim 1, characterized by this.

6. Both the first adhesive layer and the second adhesive layer are formed by curing with an adhesive. The adhesive is 40 - 60 parts of polyurethane emulsion 12 - 22 parts of thickener 4 - 8 parts of wetting agent 0.5 - 2 parts of long-chain alkyl silane coupling agent Prepared from raw materials in parts by weight of 20 - 30 parts of water. The heat preservation, waterproof and high-strength packaging bag according to claim 1, characterized by this.

7. The thickener is Calculated in parts by weight, add 10 - 18 parts of starch to 80 - 120 parts of water, drop 0.3 - 0.8 parts of 1 - 2 mol / L hydrochloric acid aqueous solution, heat up to 65 - 85 °C, stir for 30 - 60 min to prepare starch hydrolyzate in step A1, and Prepared by adding 0.2 - 0.5 parts of diethylene glycol, 0.1 - 0.3 parts of acrylate copolymer and 1 - 3 parts of magnesium aluminum silicate to the starch hydrolyzate and stirring uniformly to prepare the thickener in step A2. The heat preservation, waterproof and high-strength packaging bag according to claim 6, characterized by this.

8. The wetting agent is composed of oleylamine polyoxyethylene ether and polyvinyl alcohol, and the weight ratio of the oleylamine polyoxyethylene ether to the polyvinyl alcohol is 1:(0.2 - 0.6). The heat-insulating waterproof high-strength packaging bag according to claim 6 is characterized by this.

9. The adhesive is prepared by step B1 of adding the wetting agent to water, stirring uniformly to prepare a mixed solution, and step B2 of adding a polyurethane emulsion, a thickening agent, and a long-chain alkyl silane coupling agent to the mixed solution, stirring uniformly to prepare the adhesive. The heat-insulating waterproof high-strength packaging bag according to any one of claims 6 to 8 is characterized by this.

10. Step S1 of applying the adhesive to one side of the heat-insulating buffer layer to form a first adhesive layer, laminating the outer paper layer, heat-insulating, and drying; Step S2 of applying the adhesive to the side of the heat-insulating buffer layer away from the outer paper layer to form a second adhesive layer, then laminating the outer paper layer, heat-insulating, and drying; Step S3 of applying a waterproof agent to the inner paper layer to form an inner waterproof layer, applying the waterproof agent to the outer paper layer to form an outer waterproof layer, drying, and manufacturing a composite paper; Step S4 of cutting and combining the composite paper to manufacture a heat-insulating waterproof high-strength packaging bag, including The manufacturing process of the heat-insulating waterproof high-strength packaging bag according to any one of claims 6 to 8 is characterized by this.

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