A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material and its preparation method

Abstract

The present application relates to a high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material and a preparation method thereof. The high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material adopts an aluminum foil material layer, a composite glue layer, and a PVC material layer arranged from top to bottom. The composite glue layer includes the following components: composite glue and a curing agent. The composite glue layer is formed by curing the composite glue. The composite glue includes the following components: polyurethane, silicate, inorganic ceramic powder, textile fiber, and ethanol. The preparation method thereof includes preparing an aluminum foil material layer and a PVC material layer, coating the composite glue on the surface of the PVC material layer, bonding the aluminum foil material layer and the PVC material layer by a laminating process, spraying a curing agent, and drying. The present application prepares a special composite glue layer, and the glue layer has high barrier properties and high strength characteristics, which can meet the requirements of using the aluminum foil-laminated PVC sandwich coating material made from the composite glue layer as an energy material for gas storage and power generation.

Description

Technical Field

[0001] The present application relates to the technical field of coating materials, and in particular to a high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material and a preparation method thereof. Background Art

[0002] PVC mesh coating material is a composite material composed of PVC and a specific coating. This material is made by special processing of PVC and coating. It has excellent waterproof, oil-proof, anti-fouling and wear-resistant properties. It also has the advantages of being lightweight, durable, easy to process and manufacture. Due to these characteristics, PVC mesh coating material is widely used in various fields, such as construction, packaging, transportation, electronics, etc. In the electronics field, it can be used to make various waterproof and oil-proof electronic products and components.

[0003] In related technologies, aluminum foil coating is added to the PVC mesh coating material to form a new composite material. This material combines the waterproof, oil-proof, anti-fouling, and wear-resistant properties of the PVC mesh coating material with the metallic luster, corrosion resistance, and barrier properties of aluminum foil. It is widely used in various occasions that require high strength, high wear resistance, high waterproofness, and high barrier properties.

[0004] It is currently used as an energy material for gas storage power generation. However, due to the high requirements for air permeability of energy materials for gas storage power generation, it is required to have a lower air permeability, that is, according to the test method of DIN 53380-2, the air permeability is required to be less than 250 (cm 3 / (m 2 ·d·bar)), and the air permeability of the aluminum foil coated PVC sandwich coating material in the related art is far from meeting the requirements. In order to solve this problem, a high-barrier, high-strength aluminum foil coated PVC sandwich coating material and a preparation method thereof are provided. Summary of the Invention

[0005] In order to solve the problem in the related art that the air permeability of the aluminum foil coated PVC mesh coating material does not meet the requirements of being used as a gas storage and power generation energy material, the present application provides a high-barrier, high-strength aluminum foil coated PVC mesh coating material and a preparation method thereof.

[0006] In the first aspect, the present application provides a high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material using the following technical solutions:

[0007] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which consists of an aluminum foil material layer, a composite glue layer, and a PVC material layer arranged in sequence from top to bottom;

[0008] The composite glue layer is formed by curing the composite glue and the curing agent in a weight ratio of 1: (0.2-0.25);

[0009] The composite glue comprises the following components in parts by weight: 40-60 parts of polyurethane, 30-50 parts of silicate, 10-20 parts of inorganic ceramic powder, 5-10 parts of textile fiber, and the balance is ethanol.

[0010] By adopting the above technical solution, the obtained aluminum foil coated PVC mesh coating material has low air permeability while maintaining high barrier and high strength properties, and can meet the requirements for use as a gas storage and power generation energy material.

[0011] The reasons may be: 1) Aluminum foil has good moisture resistance and very high gas barrier properties. The combination of aluminum foil with PE and PET materials further enhances the barrier properties of the materials;

[0012] 1. The composite glue layer made of polyurethane, silicate, inorganic ceramic powder, textile fiber, ethanol and curing agent not only makes the layers tightly bonded, but also effectively reduces the chance of gas permeation, thereby increasing the rigidity, barrier properties and toughness of the glue layer;

[0013] At the same time, ethanol can make the ingredients in the fabric glue dissolve and diffuse better, thereby improving the viscosity and adhesion of the glue and making the glue layer more uniform and compact. It helps to quickly form a dry coating after applying the glue, thereby improving the stability of the adhesive structure. In the subsequent drying process, the ethanol evaporates and these ingredients will form a uniform coating on the joint surface, further enhancing the bonding effect.

[0014] 3) The PVC material layer provides structural support, further improving the overall barrier properties of the material.

[0015] Preferably, the silicate is one or more of magnesium silicate, iron silicate, calcium silicate and aluminum silicate.

[0016] By adopting the above technical solution: the silicate added in the preparation of raw materials makes the prepared composite glue have the characteristics of strong adaptability, excellent bonding strength and the like.

[0017] Preferably, the fabric fibers are one or more of wool, cotton, and linen.

[0018] By adopting the above technical solution, the fabric fibers added to the raw materials make the prepared composite glue have the advantage of strong bonding force.

[0019] Preferably, the aluminum foil material layer comprises a PE layer, an aluminum foil layer and a PET layer laminated in sequence from top to bottom.

[0020] By adopting the above technical solution: the multi-layer structure design also makes the layers tightly bonded, which helps to prevent gas from penetrating between layers and further enhances the barrier properties of the product.

[0021] Preferably, the composite glue is prepared by the following preparation steps:

[0022] S1. Mixing polyurethane, 30-50 wt% of silicate, and textile fibers, and heating and melting them to obtain a mixture A;

[0023] S2. Adding the remaining silicate and inorganic ceramic powder to mixture A to obtain mixture B;

[0024] S3. Add ethanol to mixture B, stir evenly, and seal to obtain the mixture.

[0025] By adopting the above technical solution, the prepared composite glue layer not only meets a certain lamination fastness, but also ensures low air permeability and achieves greater barrier properties.

[0026] Preferably, the PVC material layer includes a polyester fiber mesh and a PVC layer coated on both sides of the polyester fiber mesh, and the PVC layer is made by coating and curing a PVC paste.

[0027] By adopting the above technical solution: the use of polyester fiber mesh provides a good skeleton for the PVC layer and enhances the structural strength. The coating and curing of PVC paste can ensure that the PVC layer is tightly combined with the polyester fiber mesh to form a dense barrier layer and reduce gas permeation.

[0028] Preferably, the PVC paste comprises the following components in parts by weight:

[0029] 100 parts of PVC resin powder, 60-75 parts of plasticizer, 3-6 parts of stabilizer, 2-4 parts of soybean oil, 10-18 parts of titanium dioxide, 10-45 parts of calcium carbonate, 0-15 parts of flame retardant, 1-3 parts of anti-UV agent, 1-2 parts of antioxidant, and 1.5-3 parts of mildew inhibitor.

[0030] By adopting the above technical solution, the PVC paste prepared from the above components has significant advantages in terms of adhesion and air permeability requirements.

[0031] Preferably, the PVC paste further comprises 3-6 parts of composite glue.

[0032] By adopting the above technical solution, the polyester fiber mesh and the PVC layer can be firmly bonded together, which is conducive to ensuring that a better fixing effect can be achieved after bonding.

[0033] Preferably, the PVC material layer further includes a back mounting layer provided on a side away from the composite glue layer.

[0034] By adopting the above technical solution: performing surface treatment on the side of the PVC material layer away from the composite glue layer to form a back mounting layer, it is beneficial to achieve the effect of anti-fouling and self-cleaning, and at the same time can further improve its barrier performance and its own structural strength.

[0035] In the second aspect, the present application provides a method for preparing a high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which adopts the following technical solution:

[0036] A method for preparing a high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, the preparation steps are as follows:

[0037] A1. Prepare the aluminum foil material layer and the PVC material layer separately;

[0038] A2. Then apply a layer of composite glue on the upper surface of the PVC material layer;

[0039] A3. Finally, the aluminum foil layer and the PVC layer are bonded together using a laminating process, and curing agent is sprayed on them. The layers are placed in a drying oven at 60-80°C for 48-72 hours for drying and curing.

[0040] By adopting the above technical solution: under the above conditions, it is possible to ensure that the composite glue fully reacts and achieves a good curing effect. In addition, the composite glue can form a highly adhesive coating with the surface of the substrate, thereby improving the adhesion and durability, and reducing the defective rate. In addition, the curing time is relatively short, which can improve production efficiency and reduce production costs.

[0041] The high-barrier, high-strength aluminum foil-laminated PVC mesh coating material prepared by the above steps has extremely low air permeability, good barrier properties, high strength, and can be used in various relatively harsh environments. All process production conditions can be easily implemented, raw materials are also easily obtained, the steps are simple and not cumbersome, and it has high production value and economic benefits.

[0042] In summary, this application includes at least one of the following beneficial technical effects:

[0043] 1. This application prepares a special composite glue layer that has high barrier properties and high strength characteristics. The high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material made from the composite glue layer can be used as an energy material for gas storage power generation.

[0044] 2. This application adopts a series of simple process steps, such as coating, surface treatment, coating with composite glue, lamination, etc., which makes the entire preparation process relatively simple and reduces production costs. DETAILED DESCRIPTION

[0045] The present application is further described in detail below with reference to the examples. Except for the special instructions below, the raw materials used in the present application are all common commercially available materials.

[0046] Preparation Examples 1-6

[0047] A composite glue, the amount of each component (kg) is shown in the following table, and is prepared by the following preparation method:

[0048] Divide the silicate into two parts and add equal amounts into S1 and S2 respectively;

[0049] S1. First, polyurethane, 50 wt% silicate, and fabric fiber are heated and melted at 195° C. to obtain a mixture A;

[0050] The silicate is aluminosilicate with an average particle size of 10 μm, and the fabric fiber is short-cut wool fiber;

[0051] S2. Add the remaining silicate and inorganic ceramic powder to mixture A, and mix at 3000 rpm for 75 min to obtain mixture B;

[0052] S3. Add ethanol to mixture B, stir at 2800 rpm for 30 min, and then seal the mixture to obtain the product.

[0053] Table: Components and weights of composite glue in Preparation Examples 1-6 (kg)

[0054]

[0055]

[0056] Preparation Example 7-11

[0057] A composite glue is different from Preparation Example 1 in that the total amount of silicate added to S1 and S2 remains unchanged, but the specific types selected are different, as shown in the following table.

[0058] Table: Comparison of silicate types in Preparation Examples 7-11

[0059]

[0060] Preparation Examples 12-15

[0061] A composite glue is different from Preparation Example 1 in that the total amount of fabric fibers added in S1 remains unchanged, but the specific types selected are different, as shown in the following table.

[0062] Table: Comparison of fabric fiber types in Preparation Examples 12-15

[0063]

[0064]

[0065] Preparation Example 16

[0066] A composite glue, which differs from Preparation Example 1 in that the silicate is added in one go, that is, all the silicate is added into S1.

[0067] Preparation Examples 17-22

[0068] A PVC paste, the dosage of each component (kg) is shown in the following table:

[0069] The titanium dioxide is purchased from Lomon Billions LR-108 titanium dioxide;

[0070] The plasticizer was purchased from Jiangsu Sendi's dioctyl terephthalate DOTP;

[0071] The stabilizer is KQ-315 purchased from Bangtai Petrochemical;

[0072] The flame retardant was purchased from Doher-605 of Doher Chemical;

[0073] The anti-UV agent was purchased from Dongguan Shenghao's HF1130-111;

[0074] Antioxidant 1098 was purchased from Changzhou Youfeng Chemical;

[0075] The mildew inhibitor was purchased from Shanghai Huishi Chemical HSA-FM;

[0076] Table: Components and weights (kg) of PVC pastes in Preparation Examples 17-22

[0077]

[0078]

[0079] Performance testing

[0080] (1) Peel strength test

[0081] Three equal-sized samples (0.1*0.1 cm) were taken from the left, middle, and right areas of the prepared aluminum foil-laminated PVC mesh coating material sample, and tested using a peel force tester.

[0082] The movable test head is attached to the sample surface, and a load is applied between the composite glue layer and the sample surface. The tester records the peel force under different loads and analyzes the test results.

[0083] (2) Air permeability test

[0084] The specific testing standard refers to DIN 53380-2:2006 Testing of plastics. Determination of gas transmission rate. Part 2: Plastic film pressure gauge method. The gas transmission rate is calculated to characterize the air permeability of aluminum foil coated PVC sandwich coating material samples.

[0085] Example

[0086] Example 1

[0087] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is prepared by the following preparation steps:

[0088] A1. The PVC paste prepared in Preparation Example 22 was applied to both the upper and lower surfaces of the polyester mesh layer to form a 3 mm thick PVC layer. The lower surface of the bottom PVC layer was surface treated to form a back-mounting layer. PE and PET layers were laminated on the upper and lower surfaces of the aluminum foil, respectively, to form a 3 mm thick aluminum foil layer.

[0089] A2. The composite glue prepared in Preparation Example 1 was applied to the upper surface of the PVC material layer to form a 3 mm thick composite glue layer;

[0090] A3. Finally, the aluminum foil layer and the PVC layer are bonded together using a laminating process. Polyisocyanate accounting for 20% of the composite glue weight is sprayed on them. The layers are then placed in a 60°C drying oven for at least 48 hours to cure.

[0091] Example 2

[0092] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which differs from Example 1 in that the aluminum foil material layer in A1 only contains aluminum foil.

[0093] Example 3

[0094] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which differs from Example 1 in that in A1, PVC paste is only coated on either the upper or lower surface of the polyester fiber mesh layer.

[0095] Example 4

[0096] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which differs from Example 1 in that the lower surface of the PVC layer in A1 is not surface treated.

[0097] Example 5

[0098] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which differs from Example 1 in that A3 is placed in an 80°C drying oven for at least 24 hours.

[0099] The samples prepared in Examples 1-5 were taken and their adhesion and air permeability were tested according to the above measurement steps and standards. The average values of the test results were recorded in the table below.

[0100] Table: Performance test results of Examples 1-5

[0101]

[0102]

[0103] As can be seen from the table above, the peel strength in Example 1 is 260 N / mm and the gas transmission rate is 242 cm 3 / (m·d·bar), has good adhesion performance, and meets the requirements of energy materials for gas storage and power generation;

[0104] It can also be seen from the data in the above table that in Examples 1-5, the peel strength is between 193-260 N / mm, and the gas transmission rate is between 242-323 cm 3 / (m·d·bar), the interval span is relatively large;

[0105] Analyze the possible reasons:

[0106] 1. Without any pretreatment of the aluminum foil, it cannot achieve strong adhesion by itself. It may be necessary to apply thicker glue to barely maintain adhesion, which will cause a certain degree of waste of resources.

[0107] 2) Single-sided coating of PVC paste reduces the bonding surface area and lacks a double-sided barrier layer, resulting in decreased adhesion and increased air permeability. In order to maintain the barrier properties and stability of the material, double-sided coating is necessary.

[0108] 3) Surface treatment of the lower surface of the PVC layer will make the surface of the material rough and reduce the air permeability; on the other hand, it can also form a back-mounting layer to enhance the barrier properties and achieve anti-fouling and self-cleaning effects;

[0109] 4) The drying temperature of 80°C may cause ethanol to evaporate rapidly, resulting in uneven distribution of the mixed glue after spraying the curing agent, with some places being thick and some places being thin, which is not conducive to forming a stable composite glue layer. At the same time, the curing time of 24 hours may not be enough to complete the curing reaction, resulting in a slight decrease in the air permeability and adhesion of the obtained material. The preparation steps used in Example 1 are:

[0110] In A1, PVC paste is applied on both sides to form a stable base and surface layer structure. Surface treatment is performed to form a back-mounting layer to improve overall barrier properties. This step is the foundation of the entire preparation process, providing a stable structural foundation and ensuring adhesion for subsequent steps.

[0111] In A2, the application of composite glue can increase the adhesion and ensure the appropriate coating thickness. This step not only enhances the adhesion between the PVC material layer and the aluminum foil material layer, but also provides a guarantee for the further processing and performance of the material. This step further enhances the adhesion of the material on the basis of A1, ensuring the close bonding between the aluminum foil material layer and the PVC mesh coating material. In A3, the lamination process is adopted to ensure the close bonding between the aluminum foil material layer and the PVC material layer. The spraying of polyisocyanate further strengthens the chemical bonding between the layers. The long-term placement in a 60°C drying oven ensures the complete cross-linking and bonding between the layers, improving the overall performance and stability of the material. This step is the finishing part of the entire preparation process. It ensures the close bonding and complete curing between the layers, thereby obtaining a high-barrier, high-strength aluminum foil-laminated PVC mesh coating material with excellent performance.

[0112] In summary, each preparation step in Example 1 influences each other and works together to ensure the high barrier and high strength properties of the final material. Each step is necessary and is closely related to and influences each other. Through the rational design and control of these steps, a high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material with excellent performance can be obtained.

[0113] Examples 6-10

[0114] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material, which differs from Example 1 in that the usage of the composite glue in S2 is different, and the specific corresponding relationship is shown in the table below.

[0115] Table: Comparison table of composite glue usage in Examples 6-10

[0116] Group Composite glue Example 6 Prepared from Preparation Example 2 Example 7 Prepared from Preparation Example 3 Example 8 Prepared from Preparation Example 4 Example 9 Prepared from Preparation Example 5 Example 10 Prepared from Preparation Example 6

[0117] Comparative Example 1

[0118] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that an equal amount of acetone is used instead of polyethanol.

[0119] Comparative Example 2

[0120] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that an epoxy resin with the same molecular weight as the polyurethane is selected and an equal amount of the epoxy resin is used instead of the polyurethane.

[0121] Comparative Example 3

[0122] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that an equal amount of polyorganosiloxane is used instead of silicate.

[0123] Comparative Example 4

[0124] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that calcium carbonate powder with the same particle size as the inorganic ceramic powder is selected, and an equal amount of calcium carbonate powder is used instead of the inorganic ceramic powder.

[0125] Comparative Example 5

[0126] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that an equal amount of chopped carbon nanotubes is used instead of chopped textile fibers.

[0127] The samples prepared in Examples 6-10 and Comparative Examples 1-5 were taken and their adhesion and air permeability were tested according to the above measurement steps and standards. The average values of the test results were recorded in the table below.

[0128] Table: Performance test results of Examples 6-10 and Comparative Examples 1-5

[0129]

[0130] As can be seen from the table above, the peel strength in Examples 6-10 is in the range of 207-262 N / mm, and the gas transmission rate is 183-230 cm 3 / (m·d·bar), the air permeability can meet the requirements of being used as a gas storage and power generation energy material, and the adhesion is strong, among which Examples 8-9 can be used as preferred examples;

[0131] It can also be seen from the above table that as the input amount of aluminosilicate increases, the bonding strength also increases accordingly, but as the input amount of wool continues to increase, the bonding strength decreases slightly, referring to Examples 7 and 9, and the amount of ethanol used as a solvent cannot be too small, otherwise it will lead to a significant decrease in bonding strength.

[0132] As for Comparative Examples 1-5, the peel strength is in the range of 171-221 N / mm, and the gas transmission rate is 224-268 cm 3 / (m·d·bar), and the gas transmission rate in Comparative Example 10 is 268cm 3 / (m·d·bar), which obviously does not meet the requirements. In addition, the adhesion performance of Examples 6-10 is not very good either;

[0133] Analyze the possible reasons:

[0134] 1) Although both acetone and ethanol are excellent glue solvents, acetone is more volatile than ethanol and may volatilize excessively during the drying process, thereby reducing the bonding strength. In addition, the molecular structure of acetone is different from that of ethanol, which may affect the cross-linking degree and density of the coating, thereby increasing the gas permeability of the coating. In addition, acetone is a strong irritant and its large-scale use may cause damage to the human body.

[0135] 2) The molecular structures and properties of epoxy resin and polyurethane are different. The hardness and cross-linking degree of epoxy resin may be relatively low, which may cause the coating to shrink or deform easily during the drying process. In addition, the gas permeability of epoxy resin may be relatively high, which may also affect the gas permeability of the coating.

[0136] 3) Polyorganosiloxane has a low viscosity and a relatively soft texture, while the molecular structure of glass fiber is relatively disordered, resulting in relatively weak intermolecular interactions, which can easily cause the coating to shrink or deform during the drying process. In addition, the surface energy of glass fiber is relatively low, and its adhesion to the substrate is weak. There may be certain chemical incompatibility, resulting in reduced adhesion;

[0137] 4) Due to their unique molecular arrangement, carbon nanotubes have a high aspect ratio and a small diameter. This structure makes it easy for them to form a dense network structure in the coating, increasing the thickness of the coating. At the same time, due to the poor uniform dispersion of carbon nanotubes, localized accumulation may occur in the coating. In addition, carbon nanotubes may produce some structural defects such as holes, bends and fractures during the preparation and processing process. These defects may form "channels" or "bridges" in the coating, increasing the permeability of the coating.

[0138] Ethanol is a good solvent that is highly compatible with polyurethane, aluminosilicate, and other components, dissolving and mixing them. Acetone has different solubility and chemical properties than ethanol, and may not achieve the desired mixing effect and coating stability. Acetone may also change the viscosity, drying speed, and properties of the final coating, thereby affecting the entire preparation process and the final performance of the product.

[0139] Polyurethane has high elasticity and adhesive properties, while epoxy resin may not have these characteristics; therefore, replacing polyurethane with epoxy resin may affect the adhesion, elasticity and other properties of the coating; the compatibility of epoxy resin with aluminosilicate, inorganic ceramic powder and other components may vary, resulting in uneven mixing or reduced coating performance;

[0140] Aluminosilicate plays a key role in the preparation process, especially in its bonding and adhesion properties with polyurethane. The properties and chemical structure of polyorganosiloxane are different from those of aluminosilicate and may not provide the same adhesion and stability. The compatibility and chemical reaction of polyorganosiloxane with polyurethane, inorganic ceramic powder and other components may also be different, resulting in unstable coating performance. Inorganic ceramic powder plays a key role in providing barrier properties and enhancing adhesion. Although glass fiber is also a reinforcing material, its properties and functions may be different from those of ceramic powder, and it may not provide the same barrier properties and adhesion. Carbon nanotubes have excellent properties in certain aspects, such as strength and conductivity, but in this preparation process, textile fibers play a key structural role, providing the required strength and stability for the coating. Carbon nanotubes may not provide the same structural support, and the addition of carbon nanotubes may change the overall structure and chemical properties of the coating, thereby affecting adhesion, barrier properties and other properties.

[0141] In summary, each component has its unique and irreplaceable role in the preparation of high-barrier, high-strength aluminum foil-laminated PVC sandwich coating materials. Their properties and functions play a key role in the formation of composite glue. They work closely with each other and produce the expected chemical and physical effects, thereby affecting the performance of the final product.

[0142] Examples 11-15

[0143] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that the use of the composite glue is different. The specific corresponding relationship is shown in the table below.

[0144] Table: Comparison table of composite glue usage in Examples 11-15

[0145] Group Composite glue Example 11 Prepared from Preparation Example 7 Example 12 Prepared from Preparation Example 8 Example 13 Prepared from Preparation Example 9 Example 14 Prepared from Preparation Example 10 Example 15 Prepared from Preparation Example 11

[0146] The samples prepared in Examples 11-15 were taken and their adhesion and air permeability were tested according to the above measurement steps and standards. The average values of the test results were recorded in the table below.

[0147] Table: Performance test results of Examples 11-15

[0148]

[0149] As can be seen from the table above, the peel strength of Examples 12-16 is in the range of 248-261 N / mm, and the gas transmission rate is 248-277 cm 3 / (m·d·bar), wherein the adhesive strength performance is good, but the air permeability does not meet the use requirements except for Example 7;

[0150] It can be seen that the air permeability of high-barrier, high-strength aluminum foil-laminated PVC sandwich coating materials made of different types of silicates is different. The reasons may be as follows:

[0151] Magnesium silicate and calcium silicate may have a significant impact on the air permeability of the glue. Due to the characteristics of magnesium silicate and calcium silicate, it may reduce the adhesion of the glue, thereby affecting its sealing performance and increasing the air permeability. On the one hand, iron silicate may help to improve the rigidity and durability of the material, but on the other hand, it may also increase the air permeability to a certain extent. Aluminum silicate generally has good adhesion and sealing properties, but its mixed use with other silicates may cause a certain decline in its performance.

[0152] These silicates affect the adhesion and sealing properties of the glue, resulting in increased air permeability, so the type and amount of silicates added need to be carefully selected to obtain better performance.

[0153] Examples 16-19

[0154] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that the use of the composite glue is different. The specific corresponding relationship is shown in the table below.

[0155] Table: Comparison table of composite glue usage in Examples 17-20

[0156] Group Composite glue Example 16 Prepared from Preparation Example 12 Example 17 Prepared from Preparation Example 13 Example 18 Prepared from Preparation Example 14 Example 19 Prepared from Preparation Example 15

[0157] The samples prepared in the above examples were taken and then tested for adhesion and air permeability according to the above measurement steps and standards. The average values of the test results were recorded in the following table.

[0158] Table: Performance test results of Examples 17-20

[0159]

[0160] As can be seen from the table above, the peel strength in Examples 16-19 is in the range of 237-248 N / mm, and the gas transmission rate is 259-330 cm 3 / (m·d·bar), among which the bonding strength is applicable, but the air permeability does not meet the use requirements; it can be seen that the air permeability of high-barrier, high-strength aluminum foil-laminated PVC sandwich coating materials made of different types of textile fibers cannot meet the requirements. The reasons may be as follows:

[0161] As the types of fabric fibers increase (from cotton to cotton, linen, cotton, wool, and finally to cotton, linen, and wool), the interactions and network structures between fibers become more complex. This complex fiber network may hinder the sealing performance to a certain extent, thereby increasing its air permeability.

[0162] Moreover, polyurethane can form different chemical bonds and physical entanglements with different types of fibers. When interacting with multiple fibers (such as cotton, linen, and wool), this complex chemical and physical cross-linking may affect the viscosity and sealing properties to a certain extent, thereby increasing the air permeability.

[0163] Example 20

[0164] A high-barrier, high-strength aluminum foil-laminated PVC mesh coating material, which differs from Example 1 in that the composite glue used is prepared from Preparation Example 16.

[0165] The samples prepared in Example 20 were taken and then tested for adhesion and air permeability according to the above measurement steps and standards. The average value of the test results was recorded in the table below.

[0166] Table: Performance test results of Example 20

[0167]

[0168] From the above table, it can be seen that the peel strength in Example 20 is 214 N / mm and the gas transmission rate is 233 cm 3 / (m·d·bar), which basically meets the requirements for gas storage and power generation energy materials, but compared with Example 1, its bonding strength has a slight decrease, and the air permeability has further decreased, which is better than the air permeability of Example 1;

[0169] The reasons are analyzed as follows: 1) The compatibility between components such as polyurethane and wool and silicate is crucial to the performance of the composite glue. When the method of adding silicate changes, it may affect the compatibility between these components, thereby affecting the performance of the final product; 2) A one-time addition method may cause uneven distribution of silicate in the mixture, thereby affecting its interaction with other components such as polyurethane and wool. This uneven distribution may affect the bonding strength to a certain extent.

[0170] Examples 21-25

[0171] A high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material is different from Example 1 in that the usage of the PVC paste is different. The specific corresponding relationship is shown in the table below.

[0172] Table: Comparison of PVC paste usage in Examples 21-25

[0173] Group PVC paste Example 21 Prepared from Preparation Example 17 Example 22 Prepared from Preparation Example 18 Example 23 Prepared from Preparation Example 19 Example 24 Prepared from Preparation Example 20 Example 25 Prepared from Preparation Example 21

[0174] The samples prepared in Examples 21-25 were taken and then tested for adhesion and air permeability according to the above measurement steps and standards. The average value of the test results was recorded in the table below.

[0175] Table: Performance test results of Examples 21-25

[0176]

[0177] From the above table, it can be seen that the peel strength of Examples 21-25 is 232-240 N / mm, and the gas transmission rate is 243-248 cm 3 / (m·d·bar), good bonding strength, and can meet the requirements of gas storage and power generation energy materials;

[0178] For each component of the PVC paste, once the amount of PVC resin powder is determined, the proportion of other additives can be added as required, and their effects on adhesion and air permeability can be almost ignored.

[0179] In addition, in Examples 21-25, the content of composite glue in the PVC paste was 0, resulting in a decrease in the bonding ability between the PVC layer and the polyester fiber mesh layer. It can be seen from the peel strength that they are all lower than that of Example 1 in which the composite glue was added. As for the air permeability, compared with Example 1, there was a slight decrease.

[0180] The above are all modifications that a person skilled in the art can make to this embodiment as needed after reading this specification, which do not contribute creatively or solutions that obviously constitute technical inspiration. However, as long as they are within the scope of the claims of this application, they should be protected by patent law.

Claims

1. A high barrier, high strength aluminum foil coated PVC sandwich coating material, characterized in that: It consists of an aluminum foil material layer, a composite glue layer, and a PVC material layer arranged in sequence from top to bottom; The composite glue layer is formed by drying and curing the composite glue and curing agent in a weight ratio of 1: (0.2-0.25) in a drying room at 60-80°C for 48-72 hours; The composite glue comprises the following components in parts by weight: 40-60 parts of polyurethane, 30-50 parts of silicate, 10-20 parts of inorganic ceramic powder, 5-10 parts of textile fiber, and the balance is ethanol; Wherein, the silicate is an aluminum silicate with an average particle size of 10 μm; the fabric fiber is short-cut wool fiber; The aluminum foil material layer comprises a PE layer, an aluminum foil layer and a PET layer laminated in sequence from top to bottom; The PVC material layer comprises a polyester fiber mesh, a PVC layer coated on both sides of the polyester fiber mesh, and a back mounting layer on the side away from the composite glue layer. The PVC layer is made by coating and curing a PVC paste.

2. The high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material according to claim 1, characterized in that: The composite glue is prepared by the following preparation steps: S1. Mixing polyurethane, 30-50 wt% of silicate, and textile fibers, and heating and melting them to obtain a mixture A; S2. Adding the remaining silicate and inorganic ceramic powder to mixture A to obtain mixture B; S3. Add ethanol to mixture B, stir evenly, and seal to obtain the mixture.

3. The high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material according to claim 1, characterized in that: The PVC paste comprises the following components in parts by weight: 100 parts of PVC resin powder, 60-75 parts of plasticizer, 3-6 parts of stabilizer, 2-4 parts of soybean oil, 10-18 parts of titanium dioxide, 10-45 parts of calcium carbonate, 0-15 parts of flame retardant, 1-3 parts of anti-UV agent, 1-2 parts of antioxidant, and 1.5-3 parts of mildew inhibitor.

4. The high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material according to claim 3, characterized in that: The PVC paste also includes 3-6 parts of composite glue.

5. The method for preparing the high-barrier, high-strength aluminum foil-laminated PVC sandwich coating material according to any one of claims 1 to 4, characterized in that: The following preparation steps are adopted: A1. Prepare the aluminum foil material layer and the PVC material layer separately; A2. Then apply a layer of composite glue on the upper surface of the PVC material layer; A3. Finally, the aluminum foil layer and the PVC layer are bonded together using a laminating process, and curing agent is sprayed on them. The layers are placed in a drying oven at 60-80°C for 48-72 hours for drying and curing.

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