Wiredrawing inflatable mattress and production process thereof

Abstract

The invention discloses a wiredrawing inflatable mattress and a production process thereof, and relates to the technical field of mattresses. The preparation method comprises the following steps: firstly, inducing heterogeneous bubble nucleation of aminated polyhedral oligomeric silsesquioxane grafted and modified thermoplastic polyurethane by combining supercritical CO2 high pressure with rapid pressure relief, assisting with a gradient annealing process, and meanwhile, introducing ion exchange method loaded aldehyde quaternary ammonium salt modified nano-montmorillonite as a heterogeneous nucleating agent to prepare a thermoplastic polyurethane microcellular foaming film; then, amino-functionalized nano tourmaline powder is introduced into a micropore interface through a vacuum-assisted impregnation technology, a far infrared radiation enhancement system is constructed, aldehyde groups on the surface of montmorillonite and amino groups of the thin film are subjected to a Schiff base condensation reaction, amino groups on the surface of tourmaline and the polyurethane thin film are subjected to hydrogen bond crosslinking bonding, and a three-dimensional interpenetrating network structure is formed; finally, interface bonding is achieved through the surface micro-melting of the thermoplastic polyurethane film and the mechanical interlocking effect of the PVC base material. The prepared mattress composite surface layer has the effects of high strength, high breathability and high elasticity.

Description

Technical Field

[0001] The present invention relates to the technical field of mattresses, and particularly to a wire-drawing inflatable mattress and its production process. Background Art

[0002] As a lightweight and easy-to-store sleep product, the wire-drawing inflatable mattress is widely used in outdoor camping, temporary accommodation and other occasions. Its traditional background technology mainly adopts the production process of PVC material and drawstring structure. However, there are some defects in this traditional technology, especially in terms of resilience and breathability. First of all, the resilience of the traditional wire-drawing inflatable mattress is insufficient. Due to the limited elasticity of PVC material, the mattress is prone to aging and hardening after being used for a period of time, resulting in a decline in the resilience performance of the mattress. In addition, the drawstring structure is prone to damage during long-term use, affecting the overall stability of the mattress and further weakening the resilience. Secondly, poor breathability is another significant problem. The PVC material itself has poor breathability, and the mattress is prone to accumulate heat and moisture during use, causing the user to feel stuffy and uncomfortable. Especially in outdoor environments, the lack of good breathability will increase the risk of health problems such as rheumatism.

[0003] In order to solve these problems, some new wire-drawing inflatable mattresses adopt high-frequency welding technology and environmentally friendly materials, such as thermoplastic polyurethane elastomer (TPU), to improve the elasticity and breathability of the mattress. These improvements have alleviated the defects of traditional mattresses to a certain extent, but still need to be further optimized to achieve a better use experience. Summary of the Invention

[0004] The purpose of the present invention is to provide a wire-drawing inflatable mattress and its production process to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a wire-drawing inflatable mattress, the wire-drawing inflatable mattress includes a multi-layer composite structure and a mattress main body structure, the mattress main body structure: a surface layer, a wire-drawing layer and a bottom layer, wherein, the wire-drawing layer is made of polyester fiber filaments, and the surface layer and the bottom layer are PVC / TPU composite materials;

[0006] The preparation steps of the PVC / TPU composite material:

[0007] (1) Place the aminated thermoplastic polyurethane in a film-making mold, heat it to a molten state, blend it with modified montmorillonite at a mass ratio of 100:3-6, and then carry out supercritical CO at 24-26 MPa and 155-160 °C for 120-180 min 2Saturated penetration is carried out, followed by rapid pressure relief to induce the formation of a microporous structure with an average pore diameter of 50 μm. Then, it is heat-preserved at 100 - 120 °C for 30 - 50 min to eliminate internal stress, and then slowly cooled at a rate of 5 - 7 °C / min to 60 - 80 °C and heat-preserved for 40 - 60 min to regulate the crystallization behavior. Finally, it is naturally cooled to room temperature to obtain a microporous thermoplastic polyurethane film with a thickness of 0.1 - 0.2 mm.

[0008] (2) Load the modified tourmaline powder onto the film. Place the loaded sample in a drying oven at 50 °C and dry for 6 h, then raise the temperature to 80 °C and heat-preserve for 24 h, and then raise the temperature to 130 °C and heat-preserve for 2 h, and naturally cool to room temperature to obtain the modified thermoplastic polyurethane film.

[0009] (3) Use a 35W fiber laser with a laser wavelength of 1064 nm and a laser scanning speed of 200 mm / s to etch a micron-level dovetail groove array with a depth of 100 - 200 μm on the surface of the modified thermoplastic polyurethane film. Subsequently, asymmetric hot pressing is carried out under a pressure of 0.5 MPa to compound the film with polyvinyl chloride fibers. The temperature on the side of the modified thermoplastic polyurethane film is 160 °C, and the temperature on the side of the polyvinyl chloride fibers is 120 °C. The diameter of the polyvinyl chloride fibers is 0.5 - 1 mm, and the mass ratio of the modified thermoplastic polyurethane film to the polyvinyl chloride fibers is 2 - 3:2, and the pressure is maintained for 90 - 150 s to prepare the composite surface layer material.

[0010] Further, in the step (1), the rapid pressure relief rate is 300 MPa / s.

[0011] Further, in the step (1), the preparation method of the modified montmorillonite is as follows: Disperse sodium-based montmorillonite in deionized water at a concentration of 5 wt%, add aldehyde-based quaternary ammonium salt according to a molar ratio of 1:1 - 1.2, and carry out an ion exchange reaction for 24 - 48 h. After centrifuging at 8000 rpm for 10 min, take the solid and dry it at 50 °C for 3 h to obtain the modified montmorillonite.

[0012] Further, in the step (2), the loading method is as follows: Prepare a 5 wt% ethanol dispersion of the modified tourmaline powder and ethanol, disperse it by ultrasonic wave at 45 kHz for 20 min, then add the microporous thermoplastic polyurethane film into the dispersion and soak for 10 min, and load it onto the film through three vacuum cycle impregnations, with each vacuum degree of -0.1 MPa and a time of 30 min.

[0013] Further, the multi-layer composite structure includes a surface skin-friendly layer and various functional hierarchical structures including the fabric. The skin-friendly layer is pure cotton, and the various functional hierarchical structures including the fabric are at least one of ice bean cool feeling fabric, graphene, energy stone, waterproof and breathable film layer, memory sponge layer with special elasticity, heat insulation layer, and electric blanket.

[0014] Further, the multi-layer composite structure is vacuum adsorbed on the main structure of the mattress and integrally sewn with a flat zipper through laser positioning.

[0015] Further, the wire drawing layer is a three-dimensional cross wire drawing structure or an adjustable wire drawing structure.

[0016] Further, the wire drawing layer is prepared by using a high-strength space fabric production process, including the following preparation steps:

[0017] S1. Select polyester fiber filaments - polyethylene terephthalate fiber filaments, and then use a knitting machine for knitting. When knitting, the warp and weft density is 16×20. For 1-5 combs, 250D is used, for 2-4 combs, 500D is used, and for 3 combs, 200D is used to pass through 8 holes 88 times, and the pile warp on each side is strengthened with double warp;

[0018] S2. After knitting, check the semi-finished product after knitting to see if there are defects on the surface of the semi-finished product. After the inspection, wash the semi-finished product. The washing water temperature is 40-50°C. At the same time, the semi-finished product needs to be soaked for 1-2 minutes. After washing, dry it. Lay the semi-finished product flat on the net and dry it with a fan;

[0019] S3. Then draw the edges of the semi-finished product. When drawing the wire, 500D double warp is used to walk in a straight line, and 8 continuous dense penetrations are made in the middle, and the strip width is about 1.5 cm;

[0020] S4. Knit the middle of the semi-finished product. When knitting the middle, 88 wires are drawn through the air, 16 needles are used, and the empty spacing is 12-16 cm, so that an arc is formed after inflation, and the air pressure should be less than 3 PSI;

[0021] S5. Iron the upper surface and the lower surface of the space fabric respectively. The ironing temperature is 100-120°C. Before ironing, a small amount of water needs to be evenly sprayed on the upper surface and the lower surface of the space fabric, or a wet towel wrung out after washing is placed at the ironing place and ironed on the wet towel; then use hot press lamination. Place the space fabric and the TPU film on a flat plate, and then use a cylinder to roll left and right on the space fabric and the TPU film, and at the same time use a heating element to heat the cylinder;

[0022] S6. Evenly apply an adhesive on the surface of the space fabric, then stick the two sides of the space fabric coated with the adhesive to each other, place the adhered space fabric on a pressing plate for pressing, the pressing time is 1-3 minutes, and after pressing, put it into the dryer to dry the upper and lower surfaces of the space fabric to obtain a high-strength space fabric, and the hot air temperature is 25-35°C.

[0023] Furthermore, the inflatable drawstring is designed with different inflation amounts to achieve different drawstring lengths, and an inflatable drawstring mattress for baby sleep with a sunken middle and raised edges is formed by inflation.

[0024] Furthermore, when the mattress is deflated, through simple operations, the mattress can be automatically rolled up and preliminarily fixed, reducing the trouble of manual storage.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0026] The present invention utilizes supercritical CO 2 foaming combined with nano-montmorillonite / tourmaline synergistic modification of thermoplastic polyurethane film, and laser compounding with polyvinyl chloride fiber to prepare a high-strength, highly breathable, and highly elastic composite surface material for a health care mattress.

[0027] First, an intermittent high-pressure autoclave supercritical fluid foaming technology is adopted. Using supercritical CO 2 as a physical foaming agent, under high-pressure conditions, molecular chain saturation penetration of amino-functionalized cage-like silsesquioxane graft-modified thermoplastic polyurethane is carried out. Combining a rapid pressure release rate to induce high-density heterogeneous bubble nucleation, and supplemented by a gradient annealing process to regulate the molecular chain orientation and crystallization kinetic behavior. At the same time, ion-exchange method is introduced to load nano-montmorillonite modified with aldehyde-based quaternary ammonium salt as a heterogeneous nucleating agent. Through its intercalation and expansion effect of the layered structure, the dispersibility of the thermoplastic polyurethane matrix is optimized. Finally, a thermoplastic polyurethane microporous foaming film with a pore size distribution in the micron range is prepared, significantly improving its air permeability coefficient and dynamic resilience;

[0028] Second, further introduce amino-functionalized nano-tourmaline powder into the film through a vacuum-assisted impregnation process. Utilizing the micro-nano multi-level roughened surface of the microporous wall and the high surface energy effect of tourmaline powder, a far-infrared radiation enhancement system is constructed. The nano / micron multi-level structure of the microporous wall reflects far-infrared rays multiple times, increasing the far-infrared emissivity of the material, continuously radiating in the biologically active band, promoting human blood circulation and relieving muscle fatigue; at the same time, through the combination of the aldehyde group on the surface of montmorillonite and modified thermoplastic polyurethane, and the formation of hydrogen bond cross-linking bonds between the amino group on the surface of tourmaline and the polyurethane film, a three-dimensional interpenetrating network structure is formed, enhancing the tensile strength of the composite material; The whole process adopts supercritical CO 2 clean foaming and laser-induced surface topological structuring composite technology, and realizes interface bonding through the mechanical interlocking effect of the surface micro-melting of the thermoplastic polyurethane film and the PVC substrate, replacing traditional solvent-based adhesives, and finally forming a high-strength, highly breathable, and highly elastic composite surface material for a health care mattress. Detailed implementation mode

[0029] The following will describe the technical solutions in the embodiments of the present invention clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In order to more clearly illustrate the method provided by the present invention, the following embodiments are used for detailed description. The test methods for various indicators of a drawn inflatable mattress manufactured in the following embodiments are as follows:

[0031] Air permeability: The composite surface layer materials prepared in the examples and comparative examples were tested for air permeability. The test method refers to GB / T5453-1997, and the test conditions are a pressure difference of 100 Pa / mmH 2 O, the test area is 50 cm 2 , the temperature is 20 °C, the relative humidity is 65%, and the specimen size is 5 cm × 15 cm.

[0032] Elasticity: The composite surface layer materials prepared in the examples and comparative examples were tested for elasticity. The test method refers to GB / T3923.1-2013 for testing the tensile properties of fabrics.

[0033] Strength: The composite surface layer materials prepared in the examples and comparative examples were tested for strength. The test method refers to GB / T3923.1-2013 for testing the breaking strength of fabrics.

[0034] Negative ion generation amount: The composite surface layer materials prepared in the examples and comparative examples were tested according to the method in GB / T 30128-2013.

[0035] Example 1: A preparation method of a composite surface layer:

[0036] (1) Add 80 g of tertiary amine and 25 g of bromobutyraldehyde to a three-necked flask, then add 200 mL of absolute ethanol, introduce nitrogen protection, stir at a rate of 350 rpm, heat up to 55 °C, and reflux for 8 h; after the reaction is completed, cool to room temperature, distill off the solvent under reduced pressure, then add 200 mL of acetone to precipitate the product, filter and wash with cold acetone 3 times, and dry at 60 °C for 12 h to obtain aldehyde-based quaternary ammonium salt; in high-purity N 2Under protection, 30 parts of water-removed polytetrahydrofuran were dissolved in dry acetone, stirred at 120 rpm for 40 min, 0.1 part of the catalyst dibutyltin dilaurate was added and heated to gentle boiling, then 50 parts of isophorone diisocyanate were slowly added, and the mixture was refluxed for 3 h. 1 part of amino-functionalized cage-like silsesquioxane was added, and after continuing the reaction for 1 h, heating was stopped. The obtained emulsion was allowed to stand at room temperature until there were no obvious bubbles, and then slowly poured into a polytetrafluoroethylene mold. It was allowed to stand at room temperature for 1 d to obtain amino-functionalized thermoplastic polyurethane; Sodium montmorillonite was dispersed in deionized water at a concentration of 5 wt%, and aldehyde-based quaternary ammonium salt was added according to a molar ratio of 1:1 for a 24-h ion exchange reaction. After centrifugation at 8000 rpm for 10 min, the solid was dried at 50 °C for 3 h to obtain modified montmorillonite;

[0037] (2) The amino-functionalized thermoplastic polyurethane was placed in a film-making mold, heated to the molten state, and blended with the modified montmorillonite at a mass ratio of 100:3 at a rotation speed of 200 rpm. The premix was placed in an autoclave and subjected to supercritical CO 2 saturation permeation at 24 MPa and 155 °C for 120 min, and then rapidly depressurized at a rate of 300 MPa / s to induce the formation of a microporous structure with an average pore diameter of 50 μm; Then it was kept at 100 °C for 30 min to eliminate internal stress, and then slowly cooled at a rate of 5 °C / min to 60 °C and kept for 40 min to control the crystallization behavior. Finally, it was naturally cooled to room temperature to prepare a microporous thermoplastic polyurethane film with a thickness of 0.1 mm;

[0038] (3) Tourmaline powder with a diameter of 200 nm and 3-aminopropyltriethoxysilane were refluxed in ethanol at a mass ratio of 1:0.1 for 6 h at 60 °C to achieve amino-functionalization to prepare modified tourmaline powder; Then the modified tourmaline powder and ethanol were prepared into a 5 wt% ethanol dispersion and ultrasonicated at 45 kHz for 20 min for dispersion. Then the microporous thermoplastic polyurethane film was added to the dispersion and soaked for 10 min, and it was loaded on the film through three vacuum cycle impregnations, with a vacuum degree of -0.1 MPa each time and a time of 30 min; The loaded sample was dried in an oven at 50 °C for 6 h, then heated to 80 °C and kept for 24 h, and then heated to 130 °C and kept for 2 h, and naturally cooled to room temperature to obtain the modified thermoplastic polyurethane film;

[0039] (4) A 35W fiber laser with a laser wavelength of 1064nm and a laser scanning speed of 200mm / s is used to etch a micro-scale dovetail groove array with a depth of 100μm on the surface of the modified thermoplastic polyurethane film. Subsequently, the film and polyvinyl chloride fiber are asymmetrically hot-pressed under a pressure of 0.5MPa, with the temperature on the modified thermoplastic polyurethane film side being 160°C and that on the polyvinyl chloride fiber side being 120°C. The diameter of the polyvinyl chloride fiber is 0.5mm, and the mass ratio of the modified thermoplastic polyurethane film to the polyvinyl chloride fiber is 2:2. After holding the pressure for 90s, interface bonding is achieved through micro-melting mechanical interlocking to prepare the composite surface layer material.

[0040] Example 2: A method for preparing a composite surface layer:

[0041] (1) 90g of tertiary amine and 30g of bromobutyraldehyde are added to a three-necked flask, followed by 200mL of absolute ethanol. Nitrogen is introduced for protection, the stirring rate is 450rpm, and the temperature is raised to 60°C for reflux reaction for 10h. After the reaction is completed, it is cooled to room temperature, the solvent is removed by vacuum distillation, and then 200mL of acetone is added to precipitate the product. After filtration, it is washed 3 times with cold acetone and dried at 60°C for 12h to obtain aldehyde group quaternary ammonium salt. Under high-purity N 2 protection, 35 parts of dehydrated polytetrahydrofuran is dissolved in dry acetone, stirred at 120rpm for 40min, 0.8 part of the catalyst dibutyltin dilaurate is added and heated to gentle boiling, and then 55 parts of isophorone diisocyanate is slowly added. After reflux reaction for 3h, 5.5 parts of amino-functionalized cage-like octasilsesquioxane is added, and the reaction continues for 1h before stopping heating. The obtained emulsion is left to stand at room temperature until there are no obvious bubbles, and then slowly poured into a polytetrafluoroethylene mold. After standing at room temperature for 1d, amino-functionalized thermoplastic polyurethane is obtained. Sodium montmorillonite is dispersed in deionized water at a concentration of 5wt%, and aldehyde group quaternary ammonium salt is added according to a molar ratio of 1:1.1 for an ion exchange reaction for 36h. After centrifugation at 8000rpm for 10min, the solid is taken and dried at 50°C for 3h to obtain modified montmorillonite.

[0042] (2) The amino-functionalized thermoplastic polyurethane is placed in a film-making mold and heated to the molten state. It is blended with the modified montmorillonite at a mass ratio of 100:4.5. The premix is placed in an autoclave and subjected to supercritical CO 2 saturated penetration at 25MPa and 157.5°C for 150min. Subsequently, the pressure is rapidly released at a rate of 300MPa / s to induce the formation of a microporous structure with an average pore diameter of 50μm. Then, it is quickly transferred to the film-making mold, then kept at 110°C for 40min to eliminate internal stress, and then slowly cooled at a rate of 6°C / min to 70°C and kept at this temperature for 50min to regulate the crystallization behavior. Finally, it is naturally cooled to room temperature to obtain a microporous thermoplastic polyurethane film with a thickness of 0.15mm.

[0043] (3) Functionalize tourmaline powder with a diameter of 200 nm with 3-aminopropyltriethoxysilane at a mass ratio of 1:0.2 by refluxing in ethanol for 6 h at a temperature of 60 °C to prepare modified tourmaline powder; then configure the modified tourmaline powder into a 5 wt% ethanol dispersion with ethanol, disperse it by ultrasonic wave at 45 kHz for 20 min, then add the microporous thermoplastic polyurethane film into the dispersion and soak it for 10 min, and load it on the film through three vacuum cycle impregnations, with a vacuum degree of -0.1 MPa each time and a time of 30 min; place the loaded sample in a drying oven at 50 °C for 6 h, then raise the temperature to 80 °C and keep it warm for 24 h, and then raise the temperature to 130 °C and keep it warm for 2 h, and naturally cool to room temperature to obtain the modified thermoplastic polyurethane film;

[0044] (4) Use a 35 W fiber laser with a laser wavelength of 1064 nm and a laser scanning speed of 200 mm / s to etch a micron-level dovetail groove array with a depth of 150 μm on the surface of the modified thermoplastic polyurethane film, and then perform asymmetric hot pressing to compound the film with polyvinyl chloride fibers at a pressure of 0.5 MPa, where the temperature on the modified thermoplastic polyurethane film side is 160 °C and the temperature on the polyvinyl chloride fiber side is 120 °C, the diameter of the polyvinyl chloride fiber is 0.75 mm, and the mass ratio of the modified thermoplastic polyurethane film to the polyvinyl chloride fiber is 2.5:2, and keep the pressure for 120 s to achieve interfacial bonding through micro-melting mechanical interlocking to prepare the composite surface layer material.

[0045] Example 3: A preparation method of a composite surface layer

[0046] (1) Add 100 g of tertiary amine and 35 g of bromobutyraldehyde to a three-necked flask, then add 200 mL of anhydrous ethanol, introduce nitrogen protection, stir at a rate of 550 rpm, raise the temperature to 65 °C, and reflux for 12 h; after the reaction is completed, cool to room temperature, distill off the solvent under reduced pressure, then add 200 mL of acetone to precipitate the product, filter and wash it with cold acetone 3 times, and dry it at 60 °C for 12 h to obtain aldehyde-based quaternary ammonium salt; under high-purity N 2 protection, dissolve 40 parts of dehydrated polytetrahydrofuran in dry acetone, stir at 120 rpm for 40 min, add 1.5 parts of the catalyst dibutyltin dilaurate and heat to slightly boiling, then slowly add 60 parts of isophorone diisocyanate, reflux for 3 h, add 10 parts of amino-functionalized cage-like silsesquioxane, continue the reaction for 1 h and then stop heating, let the obtained emulsion stand at room temperature until there are no obvious bubbles, and then slowly pour it into a polytetrafluoroethylene mold, and stand at room temperature for 1 d to obtain amino-functionalized thermoplastic polyurethane; disperse sodium montmorillonite in deionized water at a concentration of 5 wt%, add aldehyde-based quaternary ammonium salt according to a molar ratio of 1:1.2 for an ion exchange reaction for 48 h, after centrifuging at 8000 rpm for 10 min, take the solid and dry it at 50 °C for 3 h to obtain modified montmorillonite;

[0047] (2) Place the aminated thermoplastic polyurethane in a film-making mold, heat it to the molten state, blend it with the modified montmorillonite at a mass ratio of 100:6, with a rotation speed of 400 rpm and a melting temperature of 180 °C. Place the premix in an autoclave and carry out supercritical CO 2 saturated penetration at 26 MPa and 160 °C for 180 min, and then quickly depressurize at a rate of 300 MPa / s to induce the formation of a microporous structure with an average pore diameter of 50 μm; then quickly transfer it to the film-making mold, then keep it at 120 °C for 50 min to eliminate internal stress, and then slowly cool it to 80 °C at a rate of 7 °C / min and keep it for 60 min to regulate the crystallization behavior. Finally, cool it naturally to room temperature to obtain a microporous thermoplastic polyurethane film with a thickness of 0.2 mm;

[0048] (3) Carry out amino-functionalization of tourmaline powder with a diameter of 200 nm and 3-aminopropyltriethoxysilane at a mass ratio of 1:0.3 by refluxing in ethanol for 6 h at a temperature of 60 °C to prepare modified tourmaline powder; then configure the modified tourmaline powder and ethanol into a 5 wt% ethanol dispersion, disperse it by ultrasonic wave at 45 kHz for 20 min, and then add the microporous thermoplastic polyurethane film to the dispersion and soak it for 10 min. Through three vacuum cycle impregnations, with a vacuum degree of -0.1 MPa each time and a time of 30 min, load it on the film; place the loaded sample in a drying oven at 50 °C for 6 h, then raise the temperature to 80 °C and keep it for 24 h, and then raise the temperature to 130 °C and keep it for 2 h, and cool it naturally to room temperature to obtain the modified thermoplastic polyurethane film;

[0049] (4) Use a 35 W fiber laser with a laser wavelength of 1064 nm and a laser scanning speed of 200 mm / s to etch a micron-level dovetail groove array with a depth of 200 μm on the surface of the modified thermoplastic polyurethane film. Subsequently, carry out asymmetric hot pressing of the film and polyvinyl chloride fiber at a pressure of 0.5 MPa, with the modified thermoplastic polyurethane film side at 160 °C and the polyvinyl chloride fiber side at 120 °C. The diameter of the polyvinyl chloride fiber is 1 mm, and the mass ratio of the modified thermoplastic polyurethane film to the polyvinyl chloride fiber is 3:2, and keep the pressure for 150 s to achieve interfacial bonding through micro-melting mechanical interlocking to prepare the composite surface layer material.

[0050] Comparative Example 1

[0051] The difference between Comparative Example 1 and Example 2 lies in the differences in steps (1) and (2). Modify steps (1) and (2) to: (1) In high-purity N 2Under protection, 35 parts of water-removed polytetrahydrofuran were dissolved in dry acetone, stirred at 120 rpm for 40 min, 0.8 part of dibutyltin dilaurate as catalyst was added and heated to gentle boiling, then 55 parts of isophorone diisocyanate were slowly added, and reflux reaction was carried out for 3 h. 5.5 parts of amino-functionalized cage-like silsesquioxane were added, and after continuing the reaction for 1 h, heating was stopped. The obtained emulsion was left standing at room temperature until there were no obvious bubbles, and then slowly poured into a polytetrafluoroethylene mold. After standing at room temperature for 1 d, amino-functionalized thermoplastic polyurethane was obtained;

[0052] (2) The amino-functionalized thermoplastic polyurethane was placed in a film-making mold, heated to the molten state, and blended with montmorillonite at a mass ratio of 100:4.5. The premix was placed in an autoclave and subjected to supercritical CO 2 saturated penetration at 25 MPa and 157.5 °C for 150 min, and then rapidly depressurized at a rate of 300 MPa / s to induce the formation of a microporous structure with an average pore diameter of 50 μm; then quickly transferred to a film-making mold, and then kept at 110 °C for 40 min to eliminate internal stress, and then slowly cooled at a rate of 6 °C / min to 70 °C and kept for 50 min to regulate the crystallization behavior. Finally, it was naturally cooled to room temperature to obtain a microporous thermoplastic polyurethane film with a thickness of 0.15 mm; the remaining steps were the same as in Example 2.

[0053] Comparative Example 2

[0054] The difference between Comparative Example 2 and Example 2 lies in the differences in steps (1) and (2), and steps (1) and (2) were changed to: (1) 90 g of tertiary amine and 30 g of bromobutyraldehyde were added to a three-necked flask, then 200 mL of absolute ethanol was added, nitrogen protection was introduced, the stirring rate was 450 rpm, the temperature was raised to 60 °C, and reflux reaction was carried out for 10 h; after the reaction was completed, it was cooled to room temperature, the solvent was removed by vacuum distillation, then 200 mL of acetone was added to precipitate the product, and after filtration, it was washed 3 times with cold acetone and dried at 60 °C for 12 h to obtain aldehyde-group quaternary ammonium salt; the sodium-based montmorillonite was dispersed in deionized water at a concentration of 5 wt%, and the aldehyde-group quaternary ammonium salt was added according to a molar ratio of 1:1.1 for an ion exchange reaction for 36 h. After centrifugation at 8000 rpm for 10 min, the solid was taken and dried at 50 °C for 3 h to obtain modified montmorillonite;

[0055] (2) The thermoplastic polyurethane was placed in a film-making mold, heated to the molten state, and blended with the modified montmorillonite at a mass ratio of 100:4.5. The premix was placed in an autoclave and subjected to supercritical CO 2Saturated penetration, followed by rapid pressure relief at a rate of 300 MPa / s to induce the formation of a microporous structure with an average pore diameter of 50 μm; then quickly transferred to a film-making mold, and then kept at 110 °C for 40 min to eliminate internal stress, and then slowly cooled at a rate of 6 °C / min to 70 °C and kept for 50 min to regulate the crystallization behavior, and finally naturally cooled to room temperature to obtain a microporous thermoplastic polyurethane film with a thickness of 0.15 mm; the remaining steps are the same as in Example 2.

[0056] Comparative Example 3

[0057] The difference between Comparative Example 3 and Example 2 lies in step (3). Step (3) is changed to: After preparing a 5 wt% ethanol dispersion of tourmaline powder with a diameter of 200 nm and ethanol, ultrasonic disperse for 20 min at 45 kHz, and then add the microporous thermoplastic polyurethane film to the dispersion and soak for 10 min. Through three vacuum cycle impregnations, with a vacuum degree of -0.1 MPa each time and a time of 30 min, load it on the film; place the loaded sample in a drying oven at 50 °C and dry for 6 h, then heat up to 80 °C and keep for 24 h, and then heat up to 130 °C and keep for 2 h, and naturally cool to room temperature to obtain a modified thermoplastic polyurethane film; the remaining steps are the same as in Example 2.

[0058] Comparative Example 4

[0059] The difference between Comparative Example 4 and Example 2 lies in steps (2) and (3). Steps (2) and (3) are changed to: (2) Place the aminated thermoplastic polyurethane in a film-making mold, heat it to the molten state, and blend it with modified montmorillonite at a mass ratio of 100:4.5, and naturally cool to room temperature to obtain a thermoplastic polyurethane film with a thickness of 0.15 mm;

[0060] (3) Realize amino-functionalization of tourmaline powder with a diameter of 200 nm and 3-aminopropyltriethoxysilane at a mass ratio of 1:0.2 by refluxing in ethanol for 6 h at a temperature of 60 °C to prepare modified tourmaline powder; then prepare a 5 wt% ethanol dispersion of the modified tourmaline powder and ethanol, ultrasonic disperse for 20 min at 45 kHz, and then add the thermoplastic polyurethane film to the dispersion and soak for 10 min. Through three vacuum cycle impregnations, with a vacuum degree of -0.1 MPa each time and a time of 30 min, load it on the film; place the loaded sample in a drying oven at 50 °C and dry for 6 h, then heat up to 80 °C and keep for 24 h, and then heat up to 130 °C and keep for 2 h, and naturally cool to room temperature to obtain a modified thermoplastic polyurethane film; the remaining steps are the same as in Example 2.

[0061] Comparative Example 5

[0062] The difference between Comparative Example 5 and Example 2 lies in the difference in step (4). Step (4) is changed to: Using a polyurethane adhesive to compound a film and polyvinyl chloride fibers, the diameter of the polyvinyl chloride fibers is 0.75 mm, and the mass ratio of the modified thermoplastic polyurethane film to the polyvinyl chloride fibers is 2.5:2, to prepare a composite surface layer material; the remaining steps are the same as those in Example 2.

[0063] Comparative Example 6

[0064] The difference between Comparative Example 6 and Example 2 is that step (3) is absent. Step (4) is changed to: Using a 35W fiber laser with a laser wavelength of 1064 nm and a laser scanning speed of 200 mm / s to etch a microscale dovetail groove array with a depth of 150 μm on the surface of the microporous thermoplastic polyurethane film, and then implementing asymmetric hot pressing to compound the film and polyvinyl chloride fibers under a pressure of 0.5 MPa, where the temperature on the side of the microporous thermoplastic polyurethane film is 160 °C and the temperature on the side of the polyvinyl chloride fibers is 120 °C, the diameter of the polyvinyl chloride fibers is 0.75 mm, the mass ratio of the microporous thermoplastic polyurethane film to the polyvinyl chloride fibers is 2.5:2, and holding the pressure for 120 s to achieve interfacial bonding through micro-melting mechanical interlocking, to prepare a composite surface layer material; the remaining steps are the same as those in Example 2.

[0065] Effect Example

[0066] The following Table 1 shows the performance analysis results of a drawn and inflated mattress using Examples 1 to 3 and Comparative Examples 1 to 6 of the present invention.

[0067] Table 1

[0068]

[0069]

[0070] From the comparison of the experimental data of air permeability and elasticity between the examples and the comparative examples, it can be found that the present invention uses an intermittent autoclave supercritical fluid foaming technology with supercritical CO 2As a physical foaming agent, it saturates and penetrates the molecular chains of thermoplastic polyurethane graft-modified with amino-functionalized cage-like sesquioxane under high-pressure conditions. Combining with a rapid pressure-release rate to induce the nucleation of high-density heterogeneous bubbles, and supplemented by a gradient annealing process to regulate the molecular chain orientation and crystallization kinetic behavior. At the same time, an ion-exchange method is introduced to load nano-montmorillonite modified with aldehyde-based quaternary ammonium salt as a heterogeneous nucleating agent. Through its intercalation and expansion effect of the layered structure, the dispersibility of the thermoplastic polyurethane matrix is optimized. Finally, a thermoplastic polyurethane microporous foaming film with a micron-sized pore size distribution is prepared, significantly improving its air permeability coefficient and dynamic resilience. From the comparison of the experimental data of the strength of the examples and the comparative examples, it can be found that in the present invention, through the combination of the aldehyde groups on the montmorillonite surface and the amino groups of the modified thermoplastic polyurethane, and the formation of hydrogen bond cross-linking bonds between the amino groups on the tourmaline surface and the polyurethane film, a three-dimensional interpenetrating network structure is formed, improving the tensile strength of the composite material. From the comparison of the experimental data of the negative ion generation amount of the examples and the comparative examples, it can be found that in the present invention, an amino-functionalized nano-tourmaline powder is introduced at the microporous interface through a vacuum-assisted impregnation process. Utilizing the micro-nano multi-scale roughened surface of the microporous wall and the high surface energy effect of the tourmaline powder, a far-infrared radiation enhancement system is constructed. The nano / micron multi-scale structure of the microporous wall reflects the far-infrared rays multiple times, improving the far-infrared emissivity of the material, continuously radiating in the biologically active band, promoting human blood circulation and relieving muscle fatigue. The whole process uses supercritical CO 2 A composite technology of clean foaming and laser-induced surface topologization realizes interface bonding through the mechanical interlocking effect of the surface micro-melting of the thermoplastic polyurethane film and the PVC substrate, replacing the traditional solvent-based adhesive, and finally forming a high-strength, highly breathable, and highly elastic composite surface material for a health care mattress.

[0071] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claim.

Claims

1. A wire drawing air mattress, comprising a multi-layer composite structure and a mattress main structure, characterized in that: The mattress main structure includes a surface layer, a drawing layer and a bottom layer, wherein the drawing layer is polyester fiber, and the surface layer and the bottom layer are PVC / TPU composite materials; The preparation steps of the PVC / TPU composite material are: (1) placing the amino thermoplastic polyurethane in a film-making mold, heating it to a molten state, blending it with modified montmorillonite at a mass ratio of 100:3-6, and then performing supercritical CO2 saturation infiltration for 120-180 min at 24-26 MPa and 155-160° C., followed by rapid pressure relief to induce the formation of a microporous structure with an average pore size of 50 μm; then keeping it at 100-120° C. for 30-50 min to eliminate internal stress, then slowly cooling it to 60-80° C. at a rate of 5-7° C. / min and keeping it for 40-60 min to regulate crystallization behavior, and finally naturally cooling it to room temperature to obtain a microporous thermoplastic polyurethane film with a thickness of 0.1-0.2 mm; (2) loading the modified tourmaline powder onto the film; placing the loaded sample in a drying oven at 50° C. for 6 h, then heating it to 80° C. and keeping it for 24 h, then heating it to 130° C. and keeping it for 2 h, and naturally cooling it to room temperature to obtain a modified thermoplastic polyurethane film; (3) A 35W fiber laser with a laser wavelength of 1064nm and a laser scanning speed of 200mm / s is used to etch a micron-scale dovetail groove array with a depth of 100-200μm on the surface of the modified thermoplastic polyurethane film, and then the film and polyvinyl chloride fiber are asymmetrically hot-pressed under a pressure of 0.5MPa, wherein the modified thermoplastic polyurethane film side is 160°C, the polyvinyl chloride fiber side is 120°C, the diameter of the polyvinyl chloride fiber is 0.5-1mm, the mass ratio of the modified thermoplastic polyurethane film to the polyvinyl chloride fiber is 2-3:2, and the pressure is maintained for 90-150s to prepare a composite surface material.

2. A wire drawing air mattress according to claim 1, characterized in that: The rapid pressure relief rate in step (1) is 300 MPa / s.

3. The wire drawing air mattress according to claim 1, characterized in that: The modified montmorillonite preparation method in step (1) is as follows: sodium montmorillonite is dispersed in deionized water at a concentration of 5 wt%, aldehyde quaternary ammonium salt is added at a molar ratio of 1:1-1.2 to carry out ion exchange reaction for 24-48 hours, and after centrifugation at 8000 rpm for 10 minutes, the solid is dried at 50° C. for 3 hours to obtain the modified montmorillonite.

4. The wire drawing air mattress according to claim 1, characterized in that: The loading method in step (2) is as follows: after the modified tourmaline powder and ethanol are prepared into a 5wt% ethanol dispersion, the dispersion is dispersed by 45kHz ultrasound for 20 minutes, and then the microporous thermoplastic polyurethane film is added to the dispersion and immersed for 10 minutes, and then the film is loaded with the film through three vacuum cycle immersions, each with a vacuum degree of -0.1MPa and a time of 30 minutes.

5. The wire drawing air mattress according to claim 1, characterized in that: The multi-layer composite structure includes a surface skin-friendly layer and a hierarchical structure containing various functional fabrics, wherein the skin-friendly layer is pure cotton, and the hierarchical structure containing various functional fabrics is at least one of ice bean cool fabrics, graphene, energy stones, waterproof and breathable membrane layers, memory foam layers with special elasticity, thermal insulation layers, and electric blankets.

6. The wire drawing air mattress according to claim 1, characterized in that: The multi-layer composite structure is vacuum-adsorbed on the main structure of the mattress, and is positioned by laser and zipped and sewn into one piece.

7. The wire drawing air mattress according to claim 1, characterized in that: The wire drawing layer is a three-dimensional cross wire drawing structure or an adjustable wire drawing structure.

8. The wire drawing air mattress according to claim 7, characterized in that: The wire drawing layer is prepared by using a high-strength space cloth production process.

9. An application of a wire drawing air mattress, characterized in that: The inflatable wire drawing is designed with different inflation amounts so that the wire drawing lengths are different, and through inflation, a baby wire drawing inflatable mattress with a concave middle and high surroundings is formed for baby sleeping.

10. An application of a wire drawing air mattress, characterized in that: When the mattress is deflated, it can be automatically rolled up and initially fixed through simple operations, reducing the trouble of manual storage.

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