High-barrier inflatable cushion and preparation process therefor

Abstract

The present invention relates to the technical field of high-barrier inflatable cushions. Disclosed are a high-barrier inflatable cushion and a preparation process therefor. The preparation process for the high-barrier inflatable cushion comprises the following steps: material feeding, heating, vacuum pressing, spray cooling, air-cooled drying, cutting, and heat sealing. The high-barrier inflatable cushion consists of an airbag forming material and an airbag base material. The airbag forming material is formed by laminating a TPU-EVOH composite material and Lycra fabric, the total thickness of the TPU-EVOH composite material is 0.4-0.8 mm, and the gram weight of the Lycra fabric is 150-230 g / m2. The airbag base material is formed by laminating a TPU-EVOH composite material and non-woven fabric, the total thickness of the TPU-EVOH composite material is 0.1-0.3 mm, and the gram weight of the non-woven fabric is 60-80 g / m2.

Description

A high-barrier inflatable cushion and its manufacturing process Technical Field

[0001] This invention relates to the field of high-barrier inflatable pad technology, specifically a high-barrier inflatable pad and its manufacturing process. Background Technology

[0002] With the increasing demand for high-performance materials in the packaging industry, inflatable mats, as an important protective material, are widely used in fields such as electronic products, pharmaceutical packaging, and food transportation. Traditional inflatable mats mostly use materials such as polyethylene (PE) and polypropylene (PP). These materials usually have a certain degree of cushioning and impact resistance, but they are significantly lacking in gas barrier properties and mechanical properties, which limits their performance in high-end applications.

[0003] In existing technologies, EVOH (ethylene-vinyl acetate copolymer), as a material with excellent gas barrier properties, is commonly used in food and pharmaceutical packaging. EVOH can effectively prevent the permeation of gases such as oxygen and carbon dioxide, extending the shelf life and storage stability of products. However, while EVOH has excellent gas barrier properties, its water resistance is poor and it is easily affected by moisture, leading to a decrease in its barrier performance in humid environments. Furthermore, EVOH is relatively brittle, making it difficult to meet the flexibility and toughness requirements of inflatable pads in practical applications. Therefore, using EVOH alone in inflatable pads cannot simultaneously achieve good gas barrier properties and mechanical properties.

[0004] On the other hand, TPU (thermoplastic polyurethane) materials are widely used in fields requiring high mechanical properties due to their excellent elasticity, abrasion resistance, and tensile strength. In inflatable mat applications, TPU provides good cushioning and durability, but its gas barrier properties are relatively weak. TPU material itself does not possess the superior gas barrier capabilities of EVOH, resulting in insufficient protection against moisture and oxidation, and an inability to effectively address gas permeation issues caused by prolonged exposure to air. Therefore, the shortcomings of traditional materials in terms of gas barrier performance and mechanical properties pose challenges for existing inflatable mats in demanding applications. Technical issues

[0005] This invention aims to address the shortcomings of existing inflatable mats in terms of gas barrier performance and mechanical properties. Specifically, traditional materials used in existing inflatable mats, such as polyethylene (PE) and polypropylene (PP), while possessing certain cushioning and impact resistance, suffer from poor gas barrier performance and mechanical properties. While EVOH exhibits excellent gas barrier performance, it suffers from poor water resistance, high brittleness, and decreased barrier performance in humid environments. TPU materials, although possessing good mechanical properties, exhibit relatively weak gas barrier performance. These problems limit the use of inflatable mats in high-end applications and urgently require solutions through reasonable material combinations and manufacturing processes. Technical solutions

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A manufacturing process for a high-barrier inflatable pad includes the following steps:

[0008] S1: Feeding: Unwind the airbag molding material TPU layer with the top facing up and feed it;

[0009] S2: Heating: Move the airbag molding material to the heating chamber and heat it;

[0010] S3: Vacuum pressure: After heating, the airbag forming material is moved to the forming chamber, vacuum adsorption, and pressure shaping;

[0011] S4: Spray cooling: After molding is completed, the airbag molding material is moved to the spray chamber for spray cooling;

[0012] S5: Air-cooled drying: After cooling, the airbag forming material is moved to the air-drying chamber for air-cooled drying;

[0013] S6: Cutting: After drying, the airbag forming material is moved to the cutting area and cut to obtain the airbag semi-finished product;

[0014] S7: Heat sealing: Heat sealing a semi-finished airbag and an airbag base material to obtain a high-barrier inflatable cushion.

[0015] Furthermore, the airbag molding material is made of TPU-EVOH composite material and Lycra fabric, and the airbag base material is made of TPU-EVOH composite material and non-woven fabric.

[0016] Furthermore, in step S2, the heating temperature is 350-400℃, and the heating time is 15-30s;

[0017] Furthermore, in step S3, the vacuum adsorption time is 10-60s, and the pressure setting time is 80-100s;

[0018] Furthermore, in step S4, the spray pressure during the spray cooling process is 0.2-0.5 MPa, and the spray time is 1-5 seconds.

[0019] Furthermore, in step S5, the air-cooled drying time is 50-100 seconds.

[0020] Furthermore, in the airbag molding material, the total thickness of the TPU-EVOH composite material is 0.4-0.8 mm, and the weight of the Lycra fabric is 150-230 g / m². 2 ;

[0021] Furthermore, in the airbag base material, the total thickness of the TPU-EVOH composite material is 0.1-0.3 mm, and the nonwoven fabric basis weight is 60-80 g / m². 2 .

[0022] Furthermore, the method for preparing the airbag molding material or airbag base material includes the following steps:

[0023] TPU-EVOH composite material is obtained by co-extruding EVOH and TPU materials through casting. PUR moisture-curing hot melt adhesive is applied to the EVOH surface of the TPU-EVOH composite material to obtain an adhesive layer. The adhesive layer is heated to 120-140℃, and Lycra fabric or non-woven fabric is bonded to the EVOH surface. After standing for 24 hours, it is cured in an environment with 50-70% humidity and 15-30℃ for 4-7 days to obtain airbag molding material or airbag base material. The thickness of TPU material is 0.15-0.8mm, the thickness of EVOH material is 0.02-0.05mm, and the peel strength of the adhesive layer is 35-60N.

[0024] Furthermore, the EVOH material includes any one of EVOH, EVOH copolymer, and EVOH nanocomposite material.

[0025] Furthermore, the preparation method of the EVOH copolymer includes the following steps: (Z)-3-bromo-1-cyclooctene is added to a mixture of acetone and sodium bicarbonate aqueous solution, heated under reflux for 1-1.5 h, filtered, concentrated filtrate, extracted with diethyl ether, separated ether phase, dried and concentrated, and vacuum distilled to obtain 3-hydroxy-1-cyclooctene; 3-hydroxy-1-cyclooctene and pyridine are added to dichloromethane, acetyl chloride is added under ice bath conditions, stirred at room temperature for 3-3.5 h, the reaction mixture is added to 2 mol / L hydrochloric acid solution, the organic phase is separated, the aqueous phase is extracted with dichloromethane, the combined organic phase is washed with saturated sodium bicarbonate aqueous solution, dried and concentrated with magnesium sulfate, and vacuum distilled to obtain (Z)-cyclooctyl-2-en-1-yl acetate;

[0026] (Z)-cyclooctyl-2-en-1-yl acetate was added to a reaction vessel, followed by toluene. The mixture was degassed using a three-cycle freeze-pump-thaw cycle. Argon gas was introduced, and the mixture was heated to 40-42°C. A second-generation GRUBBS catalyst was added, and the reaction was maintained at this temperature for 24 hours. Vinyl ethyl ether was added to quench the reaction mixture. The reaction mixture was then added to methanol to separate the polymer. The polymer was then added to dichloromethane and purified again by precipitation in methanol. 2,6-Di-tert-butyl-p-cresol was added to the polymer and the mixture was vacuum dried at 70-72°C for 24 hours to obtain a polyolefin monomer. The polyolefin monomer was then hydrogenated and deprotected to obtain an EVOH copolymer.

[0027] Furthermore, the hydrogenation process includes the following steps: adding polyolefin monomers into a container, adding xylene, 2,6-di-tert-butyl-p-cresol, and tributylamine, stirring evenly, adding p-toluenesulfonyl hydrazine, heating to 140-145°C and refluxing for 8 hours, cooling to room temperature, rotary evaporating, adding the mixed product to methanol for precipitation and purification, and drying under vacuum at 70°C for 24 hours to obtain an intermediate.

[0028] Furthermore, the deprotection process includes the following steps: adding the intermediate to tetrahydrofuran, adding 25wt% sodium methoxide solution, stirring and reacting for 24h, adding acidic methanol until the reaction pH is acidic, filtering, washing the filtrate with methanol, precipitating and purifying in methanol, adding the polymer to hexafluoroisopropanol and heating to 50°C to dissolve, and drying under vacuum at 70°C for 24h to obtain the EVOH copolymer.

[0029] Furthermore, the method for preparing the second-generation GRUBBS catalyst includes the following steps: adding the second-generation GRUBBS catalyst into a container, evacuating the vacuum, introducing argon gas, adding toluene, and stirring until homogeneous.

[0030] Furthermore, in the preparation of 3-hydroxy-1-cyclooctene, the concentration of sodium bicarbonate aqueous solution is 0.03 mol / L; in the preparation of (Z)-cyclooct-2-en-1-yl acetate, the molar ratio of 3-hydroxy-1-cyclooctene:pyridine:acetyl chloride is 0.1:0.15:0.15; in the preparation of EVOH copolymer, the molar ratio of (Z)-cyclooct-2-en-1-yl acetate:GRUBBS second-generation catalyst is 29.7:0.0074.

[0031] Furthermore, the preparation method of the EVOH nanocomposite material includes the following steps:

[0032] The mixed nanofiller was added to deionized water and ultrasonically dispersed. Tris-HCl buffer solution was added and stirred until homogeneous. Dopamine hydrochloride aqueous solution was added and stirred for 24 h. The mixture was centrifuged, the solid product was collected, and freeze-dried to obtain the dopamine-modified mixed nanofiller.

[0033] EVOH copolymer was added to N,N-dimethylformamide, heated to 70-72℃ and stirred until homogeneous, cooled to room temperature, and then dopamine-modified mixed nanofiller and boric acid aqueous solution were added in sequence. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70-72℃ and vacuum heat-treated for 6-7 hours, treated with hydrazine vapor, and vacuum dried at 50-70℃ to obtain EVOH nanocomposite material.

[0034] Furthermore, the mixed nanofiller is prepared from MXene modified with 3-aminopropyltriethoxysilane and graphene oxide.

[0035] Furthermore, in the preparation process of the dopamine-modified mixed nanofiller, the pH of the Tris-HCl buffer solution is 8.5; in the preparation process of the EVOH nanocomposite material, the amount of dopamine-modified mixed nanofiller added is 5-10 wt% of the mass of the EVOH copolymer, and the amount of boric acid added is 5-20 wt% of the mass of the EVOH copolymer.

[0036] Furthermore, the preparation method of the mixed nanofiller includes the following steps: adding lithium fluoride to a 9M hydrochloric acid solution, stirring evenly, adding titanium aluminum carbide powder under ice bath conditions, heating to 35-36℃ for 24h, washing the reaction suspension with deionized water, centrifuging, collecting the precipitate, washing the precipitate to neutral pH, ultrasonically dispersing the precipitate in deionized water, centrifuging, collecting the supernatant, purging with nitrogen, and freeze-drying to obtain MXene;

[0037] MXene was added to an aqueous ethanol solution and ultrasonically dispersed under a nitrogen atmosphere. The pH of the suspension was adjusted to 3-4, and 3-aminopropyltriethoxysilane was added. The mixture was stirred at room temperature for 24 h. The suspension was washed with ethanol, centrifuged, and freeze-dried to obtain modified MXene. Modified MXene and graphene oxide were added to N,N-dimethylformamide and ultrasonically dispersed under a nitrogen atmosphere. Carbodiimide, 1-hydroxybenzotriazole hydrate, and N,N-diisopropylethylamine were added, and the mixture was reacted under a nitrogen atmosphere for 24 h. The product was washed with N,N-dimethylformamide and deionized water and freeze-dried to obtain mixed nanofiller.

[0038] Furthermore, in the preparation of MXene, the mass ratio of lithium fluoride to titanium aluminum carbide is 1.95:2.9; in the preparation of modified MXene, the mass ratio of MXene to 3-aminopropyltriethoxysilane is 1:2; and in the preparation of mixed nanofillers, the mass ratio of modified MXene: graphene oxide: carbodiimide: 1-hydroxybenzotriazole hydrate: N,N-diisopropylethylamine is 125:125:67:67:1. Beneficial effects

[0039] 1. This invention achieves controlled polymerization of cyclic olefins through ring-opening metathesis polymerization of (Z)-3-bromo-1-cyclooctene, followed by hydrogenation and deprotection processes to prepare EVOH copolymers with regionally regular molecular structures. Unlike commercially available EVOH (EVOH-44 has 44 mol% ethylene units and EVOH-32 has 32 mol% ethylene units), the EVOH copolymers prepared by this invention have 75 mol% ethylene units, and their arrangement is linear and highly regular, providing excellent gas barrier properties for inflatable pads.

[0040] 2. To further improve the gas barrier properties and mechanical properties of the inflatable pad based on the aforementioned EVOH copolymer, this invention incorporates a self-made dopamine-modified mixed nanofiller into the EVOH copolymer and adds boric acid as a crosslinking agent to induce crosslinking. Boric acid ions induce crosslinking between the EVOH copolymer and the dopamine-modified mixed nanofiller, enhancing the interfacial interaction between the filler and the matrix resin. A crosslinked network is formed between the EVOH copolymer, boric acid, and the dopamine-modified mixed nanofiller. Simultaneously, during the heat treatment crosslinking process, the dopamine-modified mixed nanofiller also crosslinks with each other through the action of boric acid, resulting in a denser lateral and longitudinal spacing between the sheet-like fillers, thus increasing the complexity of the gas channels. The introduction of the composite filler provides the inflatable pad with excellent gas barrier properties, mechanical properties, and thermal stability.

[0041] 3. The mixed nanofiller in the dopamine-modified mixed nanofiller of the present invention is prepared by covalent bonding of MXene and graphene oxide with 3-aminopropyltriethoxysilane. The mixing gap of the mixed nanofiller is larger than that of the original MXene and graphene oxide. The purpose is to facilitate the subsequent dopamine modification and the introduction of borate ions for crosslinking with EVOH copolymer, so that the subsequent crosslinking network is more compact, the interfacial interaction is enhanced, and the gas barrier properties and mechanical properties are improved. Attached Figure Description

[0042] Figure 1 is a schematic diagram of the preparation process steps of a high-barrier inflatable pad according to the present invention;

[0043] Figure 2 is a schematic diagram of the 36-bubble seat cushion structure of a high-barrier inflatable cushion according to the present invention.

[0044] Figure 3 is a schematic diagram of the 49-bubble seat cushion structure of a high-barrier inflatable cushion according to the present invention.

[0045] Figure 4 is a schematic diagram of the structure of a high-barrier inflatable pad for preventing bedsores according to the present invention;

[0046] Figure 5 is a schematic diagram of the shoulder strap structure of a high-barrier inflatable cushion according to the present invention;

[0047] Figure 6 is a schematic diagram of the structure of a high-barrier inflatable bicycle mat according to the present invention;

[0048] Figure 7 is a schematic diagram of the double-sided seat cushion structure of a high-barrier inflatable cushion according to the present invention;

[0049] Figure 8 is a schematic diagram of the structure of an electric massage seat cushion with high barrier inflatable pad according to the present invention. The best embodiment of the present invention

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In the following examples, the following commercially available EVOH specifications were used: ethylene content 32 mol%, purchased from Sigma-Aldrich; TPU model: HF-1380A, purchased from Huafeng Group; Lycra fabric purchased from Lycra Company; nonwoven fabric purchased from Shandong Huaye Nonwoven Fabric Co., Ltd.; PUR moisture-curing hot melt adhesive model: 3930, purchased from Kain Chemical; (Z)-3-bromo-1-cyclooctene CAS: 7422-06-2; graphene oxide purchased from Sigma-Aldrich; dopamine hydrochloride purchased from Aladdin; and all other raw materials were commercially available.

[0052] The preparation method of the mixed nanofiller in the following embodiments includes the following steps: 1.95g of lithium fluoride is added to 60mL of 9M hydrochloric acid solution and stirred evenly. 2.9g of titanium aluminum carbide powder is added under ice bath conditions, and the mixture is heated to 35°C for 24h. The reaction suspension is washed with deionized water, centrifuged, and the precipitate is collected. The pH of the precipitate is washed to neutral, and the precipitate is ultrasonically dispersed in deionized water. The mixture is centrifuged, the supernatant is collected, purged with nitrogen, and freeze-dried to obtain MXene.

[0053] 100 mg of MXene was added to an ethanol-water solution with a volume ratio of 9:1 and ultrasonically dispersed under a nitrogen atmosphere. The pH of the suspension was adjusted to 3, and 200 mg of 3-aminopropyltriethoxysilane was added. The mixture was stirred at room temperature for 24 h. The suspension was washed with ethanol, centrifuged, and freeze-dried to obtain modified MXene. 125 mg of modified MXene and 125 mg of graphene oxide were added to 50 mL of N,N-dimethylformamide and ultrasonically dispersed under a nitrogen atmosphere. 67 mg of carbodiimide, 67 mg of 1-hydroxybenzotriazole hydrate, and 1 g of N,N-diisopropylethylamine were added. The mixture was reacted under a nitrogen atmosphere for 24 h. The product was washed with N,N-dimethylformamide and deionized water and freeze-dried to obtain mixed nanofillers.

[0054] Example 6: A manufacturing process for a high-barrier inflatable cushion includes the following steps: S1: Feeding: The TPU layer of the airbag molding material is rolled up with the roll facing upwards and fed;

[0055] S2: Heating: Move the airbag molding material to the heating chamber and heat at 130°C for 15 seconds;

[0056] S3: Vacuum pressure: After heating, the airbag forming material is moved to the forming chamber, vacuum adsorption for 10s, and pressure shaping for 80s;

[0057] S4: Spray cooling: After molding, the airbag molding material is moved to the spray chamber for spray cooling; 0.2MPa spray pressure, spray cooling for 1s;

[0058] S5: Air-cooled drying: After cooling, move the airbag forming material to the air-drying chamber and air-cool it for 50 seconds.

[0059] S6: Cutting: After drying, move the airbag forming material to the cutting area and cut it to obtain the airbag semi-finished product;

[0060] S7: Heat sealing: Heat sealing a semi-finished airbag and an airbag base material together to obtain a high-barrier inflatable cushion.

[0061] The preparation method of the airbag molding material includes the following steps: EVOH material and TPU material are co-extruded by casting to obtain a TPU-EVOH composite material; PUR moisture-curing hot melt adhesive is applied to the EVOH surface of the TPU-EVOH composite material to obtain an adhesive layer; the adhesive layer is heated to 120℃; Lycra fabric is bonded to the EVOH surface; the mixture is left to stand for 24 hours; and then cured for 4 days in an environment with 50% humidity and 20℃ to obtain the airbag molding material; the total thickness of the TPU-EVOH composite material is 0.4 mm, and the weight of the Lycra fabric is 150 g / m². 2 .

[0062] The preparation method of the airbag base material includes the following steps: EVOH material and TPU material are co-extruded by casting to obtain a TPU-EVOH composite material; PUR moisture-curing hot melt adhesive is applied to the EVOH surface of the TPU-EVOH composite material to obtain an adhesive layer; the adhesive layer is heated to 120℃; non-woven fabric is then bonded to the EVOH surface; the mixture is left to stand for 24 hours; and then cured for 4 days in an environment with 50% humidity and 20℃ to obtain the airbag base material; the total thickness of the TPU-EVOH composite material is 0.1 mm, and the basis weight of the non-woven fabric is 60 g / m². 2 .

[0063] In the preparation of airbag molding materials and airbag base materials, EVOH material is an EVOH nanocomposite material;

[0064] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg of mixed nanofiller is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0065] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 10g of dopamine-modified mixed nanofiller and a boric acid aqueous solution containing 20g of boric acid were added sequentially. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain the EVOH nanocomposite material. Embodiments of the present invention

[0066] Example 1: Referring to Figure 1, the preparation process of a high-barrier inflatable cushion includes the following steps: S1: Feeding: The airbag molding material TPU layer is unwound with the unwound material facing upwards and fed;

[0067] S2: Heating: Move the airbag molding material to the heating chamber and heat at 130°C for 15 seconds;

[0068] S3: Vacuum pressure: After heating, the airbag forming material is moved to the forming chamber, vacuum adsorption for 10s, and pressure shaping for 80s;

[0069] S4: Spray cooling: After molding, the airbag molding material is moved to the spray chamber for spray cooling; 0.2MPa spray pressure, spray cooling for 1s;

[0070] S5: Air-cooled drying: After cooling, move the airbag forming material to the air-drying chamber and air-cool it for 50 seconds.

[0071] S6: Cutting: After drying, move the airbag forming material to the cutting area and cut it to obtain the airbag semi-finished product;

[0072] S7: Heat sealing: Heat sealing a semi-finished airbag and an airbag base material together to obtain a high-barrier inflatable cushion.

[0073] The preparation method of the airbag molding material includes the following steps: EVOH material and TPU material are co-extruded by casting to obtain a TPU-EVOH composite material; PUR moisture-curing hot melt adhesive is applied to the EVOH surface of the TPU-EVOH composite material to obtain an adhesive layer; the adhesive layer is heated to 120℃; Lycra fabric is bonded to the EVOH surface; the mixture is left to stand for 24 hours; and then cured for 4 days in an environment with 50% humidity and 20℃ to obtain the airbag molding material; the total thickness of the TPU-EVOH composite material is 0.4 mm, and the weight of the Lycra fabric is 150 g / m².2 .

[0074] The preparation method of the airbag base material includes the following steps: EVOH material and TPU material are co-extruded by casting to obtain a TPU-EVOH composite material; PUR moisture-curing hot melt adhesive is applied to the EVOH surface of the TPU-EVOH composite material to obtain an adhesive layer; the adhesive layer is heated to 120℃; non-woven fabric is then bonded to the EVOH surface; the mixture is left to stand for 24 hours; and then cured for 4 days in an environment with 50% humidity and 20℃ to obtain the airbag base material; the total thickness of the TPU-EVOH composite material is 0.1 mm, and the basis weight of the non-woven fabric is 60 g / m². 2 .

[0075] In the preparation of airbag molding materials and airbag base materials, the EVOH material is ordinary commercially available EVOH.

[0076] Example 2: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH copolymer;

[0077] The preparation process of EVOH copolymer includes the following steps: 25g of (Z)-3-bromo-1-cyclooctene is added to a mixture of 200mL acetone and 100mL 0.03mol / L sodium bicarbonate aqueous solution, heated under reflux for 1h, filtered, concentrated the filtrate, extracted with diethyl ether, separated the ether phase, dried and concentrated, and vacuum distilled to obtain 3-hydroxy-1-cyclooctene; 0.1mol of 3-hydroxy-1-cyclooctene and 0.15mol of pyridine are added to 200mL of dichloromethane, 0.15mol of acetyl chloride is added under ice bath conditions, stirred at room temperature for 3h, the reaction mixture is added to 2mol / L hydrochloric acid solution, the organic phase is separated, the aqueous phase is extracted with dichloromethane, the combined organic phase is washed with saturated sodium bicarbonate aqueous solution, dried and concentrated with magnesium sulfate, and vacuum distilled to obtain (Z)-cyclooctyl-2-en-1-yl acetate;

[0078] 29.7 mmol (Z)-cyclooctyl-2-en-1-yl acetate was added to the reaction vessel, followed by 20 mL of toluene. The mixture was degassed using three freeze-pump-thaw cycles. Argon gas was introduced, and the mixture was heated to 40 °C. 0.0074 mmol of GRUBBS second-generation catalyst was added, and the reaction was maintained at this temperature for 24 h. 1 mL of vinyl ethyl ether was added to quench the reaction mixture. The reaction mixture was then added to methanol to separate the polymer. The polymer was then added to dichloromethane and purified again by precipitation in methanol. 2 mg of 2,6-di-tert-butyl-p-cresol was added to the polymer and the mixture was dried under vacuum at 70 °C for 24 h to obtain a polyolefin monomer. The polyolefin monomer was then hydrogenated and deprotected to obtain an EVOH copolymer.

[0079] The hydrogenation process includes the following steps: 40.5 mmol of polyolefin monomer is added to a container, along with 250 mL of xylene, 80 mg of 2,6-di-tert-butyl-p-cresol, and 29 mL of tributylamine. The mixture is stirred until homogeneous, p-toluenesulfonyl hydrazine is added, and the mixture is heated to 140 °C and refluxed for 8 h. After cooling to room temperature, the mixture is rotary evaporated. The mixed product is then added to methanol for precipitation and purification, and finally dried under vacuum at 70 °C for 24 h to obtain an intermediate.

[0080] The deprotection process includes the following steps: 6.2g of intermediate is added to tetrahydrofuran, 16g of 25wt% sodium methoxide solution is added, the mixture is stirred and reacted for 24h, acidic methanol is added until the reaction pH is acidic, the mixture is filtered, the filtrate is washed with methanol, the polymer is added to hexafluoroisopropanol and heated to 50°C to dissolve, the polymer is added to methanol to precipitate and purify, and the mixture is placed at 70°C and vacuum dried for 24h to obtain the EVOH copolymer.

[0081] The method for preparing the second-generation GRUBBS catalyst includes the following steps: adding 0.0074 mmol of the second-generation GRUBBS catalyst into a container, evacuating the container, introducing argon gas, adding 1 mL of toluene, and stirring until homogeneous.

[0082] The remaining steps are the same as in Example 1.

[0083] Example 3: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH nanocomposite material;

[0084] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg of mixed nanofiller is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0085] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 5g of dopamine-modified mixed nanofiller and 5g of boric acid aqueous solution were added sequentially. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain EVOH nanocomposite material.

[0086] The remaining steps are the same as in Example 1.

[0087] Example 4: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH nanocomposite material;

[0088] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg of mixed nanofiller is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0089] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 7g of dopamine-modified mixed nanofiller and a boric acid aqueous solution containing 15g of boric acid were added sequentially. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain the EVOH nanocomposite material.

[0090] The remaining steps are the same as in Example 1.

[0091] Example 5: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH nanocomposite material;

[0092] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg of mixed nanofiller is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0093] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 7g of dopamine-modified mixed nanofiller and a boric acid aqueous solution containing 20g of boric acid were added sequentially. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain the EVOH nanocomposite material.

[0094] The remaining steps are the same as in Example 1.

[0095] Example 7: A manufacturing process for a high-barrier inflatable cushion: A 36-bubble cushion was prepared according to the method disclosed in Example 1, as shown in Figure 2. This 36-bubble cushion uses a mold with 36 airbag positions to vacuum-adsorb and press the airbag molding material into shape. After cutting and heat sealing, a fabric padding layer is added to the bottom surface, followed by edge binding and sewing. The two corner airbags each have a built-in inflation nozzle and a built-in deflation nozzle on the back. Due to the high-barrier properties of the airbag material of this invention, this 36-bubble cushion reduces the need for inflation during use, provides comfort, and has a long service life.

[0096] Example 8: A manufacturing process for a high-barrier inflatable cushion: A 49-bubble cushion was prepared according to the method disclosed in Example 1, as shown in Figure 3. The structure and performance of this 49-bubble cushion are similar to those of Example 7, but with more, smaller, and flatter airbags, resulting in a larger contact area with the human body and a different user experience. It features built-in inflation and deflation nozzles. Due to the high-barrier properties of the airbag material, inflation operations are reduced during use, and its service life is long.

[0097] Example 9: A manufacturing process for a high-barrier inflatable mattress: The anti-bedsore mattress prepared according to the method disclosed in Example 1 is shown in Figure 4. The air bladders of this anti-bedsore mattress are arranged to meet the needs of patients with bedsores or those who need to prevent bedsores, effectively improving user comfort. It is equipped with built-in inflation and deflation nozzles. Due to the high-barrier properties of the air bladder material, inflation operations can be reduced during use, resulting in a long service life.

[0098] Example 10: A manufacturing process for a high-barrier inflatable cushion: The shoulder strap prepared according to the method disclosed in Example 1 is shown in Figure 5. This shoulder strap is used for the shoulder strap of a heavy-duty backpack. Its air bladder is closed and does not have an inflation valve. Due to the high-barrier properties of the air bladder material, it has a long service life.

[0099] Example 11: A manufacturing process for a high-barrier inflatable mat: The bicycle mat prepared according to the method disclosed in Example 1 is shown in Figure 6. The shape and airbag layout of the bicycle mat are designed according to the needs of the rider. The top airbag has a built-in inflation / deflation nozzle on the back. Due to the high-barrier properties of the airbag material, the inflation operation can be reduced during use, resulting in a long service life.

[0100] Example 10: A manufacturing process for a high-barrier inflatable cushion: A double-sided seat cushion prepared according to the method disclosed in Example 1 is shown in Figure 7. This double-sided seat cushion is made by vacuum adsorption and pressure shaping of the airbag molding material, followed by heat sealing two identical airbag semi-finished products. The backs of the two airbags in the middle of the top edge are respectively equipped with built-in inflation and deflation nozzles. Due to the high-barrier properties of the airbag material, inflation operations can be reduced during use, resulting in a long service life.

[0101] Example 11: A manufacturing process for a high-barrier inflatable cushion: An electric massage cushion prepared according to the method disclosed in Example 1 is shown in Figure 8. This electric massage cushion also includes an electric massager inside the air bladder. Due to the high-barrier properties of the air bladder material, it has a long service life.

[0102] Comparative Example 1: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH nanocomposite material;

[0103] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg of graphene oxide is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0104] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 5g of dopamine-modified mixed nanofiller and 5g of boric acid aqueous solution were added sequentially. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain EVOH nanocomposite material.

[0105] The remaining steps are the same as in Example 1.

[0106] Comparative Example 2: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH nanocomposite material;

[0107] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg MXene is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0108] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 5g of dopamine-modified mixed nanofiller and 5g of boric acid aqueous solution were added sequentially. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain EVOH nanocomposite material.

[0109] The remaining steps are the same as in Example 1.

[0110] Comparative Example 3: A manufacturing process for a high-barrier inflatable cushion: In the preparation of the airbag molding material and the airbag base material, the EVOH material is an EVOH nanocomposite material;

[0111] The preparation method of EVOH nanocomposite material includes the following steps: 100 mg of mixed nanofiller is added to 250 mL of deionized water, ultrasonically dispersed, 100 mL of Tris-HCl buffer solution is added, stirred evenly, 100 mL of dopamine hydrochloride aqueous solution is added, stirred and reacted for 24 h, centrifuged, the solid product is collected, and freeze-dried to obtain dopamine modified mixed nanofiller.

[0112] 100g of EVOH copolymer was added to N,N-dimethylformamide, heated to 70℃ and stirred until homogeneous, cooled to room temperature, and then 5g of dopamine-modified mixed nanofiller was added sequentially. The mixture was ultrasonically dispersed, added to a polytetrafluoroethylene container, heated to 70℃ and vacuum heat-treated for 6h, treated with hydrazine vapor, and vacuum dried at 50℃ to obtain EVOH nanocomposite material.

[0113] The remaining steps are the same as in Example 1.

[0114] Experiment: Barrier performance test: The TPU-EVOH composite materials prepared in Examples 1-6 and Comparative Examples 1-3 were used as test materials. The test materials were extruded to a thickness of 0.1 mm and a length and width of 200 mm × 200 mm. Barrier performance was tested according to GB / T 1038.1-2022. Experimental parameters: Test area 38.49 cm². 2 Barrier strength value ≥1, upper cavity purge and replacement time 607s, upper cavity gas pressure 9.898×10 4 The lower chamber degassing time is 60s, and the upper and lower chamber degassing time is 12h. The quality of the barrier performance is judged by the amount of gas permeation.

[0115] Mechanical property testing: The TPU-EVOH composite materials prepared in Examples 1-6 and Comparative Examples 1-3 were used as test materials and tested using a universal testing machine with a tensile rate of 50 mm / min.

[0116] The experimental data are shown in Table 1 below.

[0117] Table 1. Performance Test Data of Raw Materials for High-Barrier Inflatable Cushions

[0118] ;

[0119] Conclusion: The high-barrier inflatable pad raw material prepared by this invention has excellent barrier properties and mechanical properties.

[0120] Comparative Example 1 used graphene oxide to replace the mixed nanofiller, which resulted in a decrease in barrier properties and mechanical properties.

[0121] Comparative Example 2 showed that replacing the mixed nanofiller with MXene resulted in a decrease in barrier properties and mechanical properties.

[0122] Comparative Example 3 did not include boric acid aqueous solution, resulting in reduced barrier properties and mechanical properties. Industrial applicability

[0123] The high-barrier inflatable mat of this invention possesses excellent gas barrier and mechanical properties, making it suitable for various fields such as electronic products, pharmaceutical packaging, food transportation, and medical care. Its manufacturing process is simple, cost-controllable, and easy to industrialize, giving it high economic value and promising market prospects.

[0124] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A manufacturing process for a high-barrier inflatable cushion, characterized in that: Includes the following steps: S1： Feeding: Unwind the airbag molding material (TPU layer facing upwards) onto the roll and feed it. S2: Heating: Move the airbag molding material to the heating chamber and heat it; S3: Vacuum pressure: After heating, the airbag forming material is moved to the forming chamber, vacuum adsorption, and pressure shaping; S4: Spray cooling: After molding is completed, the airbag molding material is moved to the spray chamber for spray cooling; S5: Air-cooled drying: After cooling, the airbag forming material is moved to the air-drying chamber for air-cooled drying; S6: Cutting: After drying, the airbag forming material is moved to the cutting area and cut to obtain the airbag semi-finished product; S7: Heat sealing: Heat sealing a semi-finished airbag and an airbag base material to obtain a high-barrier inflatable cushion. The airbag molding material is made of TPU-EVOH composite material and Lycra fabric, while the airbag base material is made of TPU-EVOH composite material and non-woven fabric.

2. The manufacturing process of a high-barrier inflatable cushion according to claim 1, characterized in that: In step S2, the heating temperature is 350-400℃ and the heating time is 15-30s; in step S3, the vacuum adsorption time is 10-60s and the pressure setting time is 80-100s; in step S4, the spray pressure during the spray cooling process is 0.2-0.5MPa and the spray time is 1-5s; in step S5, the air-cooling drying time is 50-100s.

3. A high-barrier inflatable mat, characterized in that: In airbag molding materials, the total thickness of TPU-EVOH composite material is 0.4-0.8mm, and the weight of Lycra fabric is 150-230g / m². 2 In the airbag base material, the total thickness of the TPU-EVOH composite material is 0.1-0.3mm, and the nonwoven fabric basis weight is 60-80g / m². 2 .

4. A high-barrier inflatable mat according to claim 3, characterized in that: A method for preparing airbag molding material or airbag base material includes the following steps: TPU-EVOH composite material is obtained by co-extruding EVOH and TPU materials through casting. PUR moisture-curing hot melt adhesive is applied to the EVOH surface of the TPU-EVOH composite material to obtain an adhesive layer. The adhesive layer is heated to 120-140℃, and Lycra fabric or non-woven fabric is bonded to the EVOH surface. After standing for 24 hours, it is cured in an environment with 50-70% humidity and 15-30℃ for 4-7 days to obtain airbag molding material or airbag base material. The thickness of TPU material is 0.15-0.8mm, the thickness of EVOH material is 0.02-0.05mm, and the peel strength of the adhesive layer is 35-60N.

5. A high-barrier inflatable mat according to claim 4, characterized in that: The EVOH material includes any one of EVOH, EVOH copolymer, and EVOH nanocomposite material; the preparation method of EVOH copolymer includes the following steps: (Z)-3-bromo-1-cyclooctene is added to a mixture of acetone and sodium bicarbonate aqueous solution, heated under reflux for 1-1.5 h, filtered, concentrated filtrate, extracted with diethyl ether, separated ether phase, dried and concentrated, and vacuum distilled to obtain 3-hydroxy-1-cyclooctene; 3-hydroxy-1-cyclooctene and pyridine are added to dichloromethane, acetyl chloride is added under ice bath conditions, stirred at room temperature for 3-3.5 h, the reaction mixture is added to 2 mol / L hydrochloric acid solution, the organic phase is separated, the aqueous phase is extracted with dichloromethane, the combined organic phase is washed with saturated sodium bicarbonate aqueous solution, dried and concentrated with magnesium sulfate, and vacuum distilled to obtain (Z)-cyclooctyl-2-en-1-yl acetate; (Z)-cyclooctyl-2-en-1-yl acetate was added to a reaction vessel, followed by toluene. The mixture was degassed using a three-cycle freeze-pump-thaw cycle. Argon gas was introduced, and the mixture was heated to 40-42°C. A second-generation GRUBBS catalyst was added, and the reaction was maintained at this temperature for 24 hours. Vinyl ethyl ether was added to quench the reaction mixture. The reaction mixture was then added to methanol to separate the polymer. The polymer was then added to dichloromethane and purified again by precipitation in methanol. 2,6-Di-tert-butyl-p-cresol was added to the polymer and the mixture was vacuum dried at 70-72°C for 24 hours to obtain a polyolefin monomer. The polyolefin monomer was then hydrogenated and deprotected to obtain an EVOH copolymer.

6. A high-barrier inflatable mat according to claim 5, characterized in that: In the preparation of 3-hydroxy-1-cyclooctene, the concentration of sodium bicarbonate aqueous solution was 0.03 mol / L; in the preparation of (Z)-cyclooct-2-en-1-yl acetate, the molar ratio of 3-hydroxy-1-cyclooctene:pyridine:acetyl chloride was 0.1:0.15:0.15; in the preparation of EVOH copolymer, the molar ratio of (Z)-cyclooct-2-en-1-yl acetate:GRUBBS second-generation catalyst was 29.7:0.0074.

7. A high-barrier inflatable mat according to claim 5, characterized in that: The preparation method of EVOH nanocomposite materials includes the following steps: The mixed nanofiller was added to deionized water and ultrasonically dispersed. Tris-HCl buffer solution was added and stirred until homogeneous. Dopamine hydrochloride aqueous solution was added and stirred for 24 h. The mixture was centrifuged, the solid product was collected, and freeze-dried to obtain the dopamine-modified mixed nanofiller. EVOH copolymer was added to N,N-dimethylformamide, heated to 70-72℃ and stirred until homogeneous, cooled to room temperature, and then dopamine-modified mixed nanofiller and boric acid aqueous solution were added in sequence. The mixture was ultrasonically dispersed, and then added to a polytetrafluoroethylene container. The mixture was heated to 70-72℃ and vacuum heat-treated for 6-7 hours, treated with hydrazine vapor, and vacuum dried at 50-70℃ to obtain EVOH nanocomposite material. The mixed nanofiller was prepared from MXene modified with 3-aminopropyltriethoxysilane and graphene oxide.

8. A high-barrier inflatable mat according to claim 7, characterized in that: In the preparation of dopamine-modified mixed nanofillers, the pH of the Tris-HCl buffer solution is 8.5; in the preparation of EVOH nanocomposites, the amount of dopamine-modified mixed nanofillers added is 5-10 wt% of the mass of the EVOH copolymer, and the amount of boric acid added is 5-20 wt% of the mass of the EVOH copolymer.

9. A high-barrier inflatable mat according to claim 5, characterized in that: The preparation method of the mixed nanofiller includes the following steps: lithium fluoride is added to 9M hydrochloric acid solution and stirred evenly. Titanium aluminum carbide powder is added under ice bath conditions, heated to 35-36℃ and reacted for 24h. The reaction suspension is washed with deionized water, centrifuged, and the precipitate is collected. The pH of the precipitate is washed to neutral. The precipitate is ultrasonically dispersed in deionized water, centrifuged, and the supernatant is collected. Nitrogen gas is purged and freeze-dried to obtain MXene. MXene was added to an aqueous ethanol solution and ultrasonically dispersed under a nitrogen atmosphere. The pH of the suspension was adjusted to 3-4, and 3-aminopropyltriethoxysilane was added. The mixture was stirred at room temperature for 24 h. The suspension was washed with ethanol, centrifuged, and freeze-dried to obtain modified MXene. Modified MXene and graphene oxide were added to N,N-dimethylformamide and ultrasonically dispersed under a nitrogen atmosphere. Carbodiimide, 1-hydroxybenzotriazole hydrate, and N,N-diisopropylethylamine were added, and the mixture was reacted under a nitrogen atmosphere for 24 h. The product was washed with N,N-dimethylformamide and deionized water and freeze-dried to obtain mixed nanofiller.

10. A high-barrier inflatable mat according to claim 9, characterized in that: In the preparation of MXene, the mass ratio of lithium fluoride to titanium aluminum carbide is 1.95:2.9; in the preparation of modified MXene, the mass ratio of MXene to 3-aminopropyltriethoxysilane is 1:2; in the preparation of mixed nanofillers, the mass ratio of modified MXene, graphene oxide, carbodiimide, 1-hydroxybenzotriazole hydrate, and N,N-diisopropylethylamine is 125:125:67:67:1.

Images