Antibacterial temperature-regulating graphite felt comfort layer and preparation method thereof

Abstract

The application provides an antibacterial temperature-adjusting jute comfort layer and a preparation method thereof, and relates to the technical field of comfort layer processing. The comfort layer is composed of an elastic jute support layer, a composite temperature-adjusting layer and a surface antibacterial layer arranged from bottom to top. The elastic jute support layer is composed of common jute fibers and acetic acid modified jute fibers. The composite temperature-adjusting layer is composed of phase change temperature-adjusting fibers and acetic acid modified jute fibers. The surface antibacterial layer is composed of phase change temperature-adjusting fibers and antibacterial modified jute fibers. The application overcomes the shortcomings of the prior art, and develops a new comfort layer with temperature-adjusting and antibacterial effects by modifying natural jute and compounding phase change fiber materials, so that the comfort and market value of the product are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of comfort layer processing technology, specifically to an antibacterial and temperature-regulating graphite hemp comfort layer and its preparation method. Background Technology

[0002] The mattress core comfort layer is a crucial component located between the fabric layer and the support layer, directly impacting the firmness, fit, and support of the mattress. Current comfort layers are typically made from the following materials: latex, memory foam, sponge, 3D materials, coconut / mountain palm fiber, and natural animal fibers. Latex is known for its elasticity and breathability, but using it exclusively is costly, and it's prone to powdering in humid environments. Memory foam and sponge are generally soft, but their breathability is average. 3D materials offer high breathability but are firmer and more expensive. Coconut / mountain palm fiber provides good support and breathability, but is relatively firm and offers only average noise reduction. Natural animal fibers like wool offer good overall comfort but are expensive and difficult to care for. Therefore, using composite fiber materials to balance softness and comfort with cost-effectiveness is a key design principle for current mattress core comfort layer designs.

[0003] The main function of the comfort layer in the mattress core is to provide comfort for the human body when sleeping. It is necessary to maintain good support and elasticity, and on this basis, provide good temperature regulation. This is the main idea of ​​high-end mattress development. Existing research shows that phase change materials are a new type of energy material with energy storage and temperature regulation functions. Electrospinning technology can encapsulate phase change materials in polymers to form phase change temperature-regulating fibers. Fabrics with temperature regulation effects can be prepared through textile technology. However, these fibers often have poor support and are usually used as fabrics for close-fitting clothing, making it difficult to apply them to mattresses.

[0004] Hemp fiber is a natural bast fiber derived from the male hemp plant. It has properties such as breathability, durability, antibacterial and anti-mite properties, and environmental sustainability. It is widely used in textiles, home filling materials, and other fields. However, basic hemp fiber has poor elasticity, and if it is directly made into a mattress, the overall comfort will be low. Generally, it is modified or combined with other fibers. Based on this, the preparation of a new comfort layer with temperature-regulating function using natural hemp fiber combined with phase change composite fiber has certain market prospects. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an antibacterial and temperature-regulating graphite hemp comfort layer and its preparation method. By modifying natural hemp and combining it with phase change fiber materials, a novel comfort layer with temperature-regulating and antibacterial effects is developed, effectively improving the comfort and market value of the product.

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

[0007] An antibacterial and temperature-regulating graphite hemp comfort layer is disclosed, comprising, from bottom to top, an elastic hemp support layer, a composite temperature-regulating layer, and a surface antibacterial layer. The elastic hemp support layer is composed of ordinary hemp fiber and acetate-modified hemp fiber. The composite temperature-regulating layer is composed of phase-change temperature-regulating fiber and acetate-modified hemp fiber. The surface antibacterial layer is composed of phase-change temperature-regulating fiber and antibacterial modified hemp fiber. The acetate-modified hemp fiber is prepared by steaming hemp fiber, soaking it in acetic acid, adjusting the pH to neutral, and then removing and micro-treating it. The phase change temperature-regulating fiber is obtained by wave drying; the phase change temperature-regulating fiber is an electrospun fiber composed of dodecanoic acid dodecyl ester / polyvinylidene fluoride / nano Al2O3 / nano graphite tube; the antibacterial modified hemp fiber is obtained by alkali treatment of hemp fiber followed by soaking in a gel solution prepared from carboxymethyl cellulose, sodium alginate, silver nitrate, shea butter extract, nano graphite tube, and food-grade glycerin, followed by drying; and the shea butter extract is obtained by drying and pulverizing shea butter, then extracting it in ethanol solutions of 60%, 70%, and 85% concentrations, followed by drying.

[0008] Preferably, the specific preparation method of the acetate-modified hemp fiber includes the following steps:

[0009] S1-1. Boil hemp fiber in boiling water for 20-30 minutes, then soak it in ice water for 10-15 minutes. Repeat the boiling and ice water soaking steps 3-5 times to obtain pretreated hemp fiber for later use.

[0010] S1-2. Place the pretreated hemp fiber in an acetic acid solution with a pH of 3-4 and soak it in a water bath at 45-50℃ for 30-40 minutes. Then adjust the pH to neutral, rinse it with ethanol, and then microwave dry it to obtain acetic acid modified hemp fiber.

[0011] Preferably, the specific preparation method of the phase change temperature-regulating fiber includes the following steps:

[0012] S2-1. Mix polyvinylidene fluoride, nano-Al2O3 and nano-graphite tubes in a mass ratio of 100:0.1:0.2 to obtain a mixture. Place the mixture in 5-6 times its volume of mixed solvent and stir in a water bath at 70-80℃ to obtain a fiber shell liquid for later use.

[0013] S2-2. Dodecanoic acid dodecyl ester, which becomes liquid after heating, is used as the fiber core liquid. The fiber core liquid and fiber shell liquid are added to a coaxial spinning machine for electrospinning. The flow rate of the fiber core liquid is controlled at 0.009 mm / min, the flow rate of the fiber shell liquid is 0.07 mm / min, the spinning voltage is 15 KV, and the spinning temperature is 35℃ to obtain phase change temperature-regulating fiber.

[0014] Preferably, the mixed solvent is obtained by mixing acetone and N,N-dimethylacetamide in a mass ratio of 1.5-2:1.

[0015] Preferably, the method for preparing the antibacterial modified flax fiber includes the following steps:

[0016] S3-1. Preparation of shea butter extract: Shea butter is dried to constant weight at 45-50℃ and then pulverized through an 80-mesh sieve to obtain powder. The powder is added to 5-8 times its volume of 60% ethanol solution, ultrasonically extracted, and then filtered. The residue is added to 5-8 times its volume of 70% ethanol solution, ultrasonically extracted again, and then filtered. The residue is added to 5-8 times its volume of 85% ethanol solution, ultrasonically extracted again, and then filtered. The three filtrates are combined, vacuum concentrated, and then freeze-dried to obtain shea butter extract.

[0017] S3-2. Prepare materials according to the following mass ratio: carboxymethyl cellulose: sodium alginate: silver nitrate: shea butter extract: nano-graphite tube: food-grade glycerin = 8:1:0.1:0.4:0.1:3;

[0018] S3-3. Mix shea butter extract and nano-graphite tubes and add them to 3-5 times the volume of deionized water. Stir thoroughly and then add food-grade glycerin dropwise while stirring at 1200-1400 r / min. The resulting mixture is ready for use.

[0019] S3-4. Mix carboxymethyl cellulose, sodium alginate, silver nitrate and the mixture, then add 3-5 times the volume of deionized water, stir at 800-1000 r / min for 10-15 min to obtain a mixed gel solution for later use.

[0020] S3-5. Soak the hemp fiber in an alkaline solution with a pH of 9-10 for 20-30 minutes, then remove it, rinse it with ethanol, and then soak it in the mixed adhesive solution for 20-30 minutes. Remove it, roll it to remove excess mixed adhesive solution, comb it out, and then dry it to obtain antibacterial modified hemp fiber.

[0021] Preferably, the ultrasonic extraction power in step S3-1 is 400-600W, and the extraction time for a single extraction is 20-30 minutes.

[0022] Preferably, in the elastic flax support layer, ordinary flax fiber accounts for 30%-40%, and acetate-modified flax fiber accounts for 60%-70%; in the composite temperature-regulating layer, phase change temperature-regulating fiber accounts for 50%-60%, and acetate-modified flax fiber accounts for 40%-50%; in the surface antibacterial layer, phase change temperature-regulating fiber accounts for 20%-30%, and antibacterial modified flax fiber accounts for 70%-80%.

[0023] The preparation method of the antibacterial and thermoregulating graphite hemp comfort layer includes the following steps:

[0024] (1) Mix ordinary flax fiber and acetate-modified flax fiber evenly, and then form an elastic flax support layer after carding, web laying and needle punching.

[0025] (2) The phase change temperature-regulating fiber and acetate-modified hemp fiber are mixed evenly, and then combed, laid and needle-punched to form a composite temperature-regulating layer;

[0026] (3) The phase change temperature regulating fiber and antibacterial modified flax fiber are mixed evenly, and after carding, web laying and needle punching, an antibacterial surface layer is formed;

[0027] (4) Place the elastic flax support layer inside the rectangular enclosure, then cover the composite temperature regulating layer on the elastic flax support layer, and hot press and needle punch to shape it, thus completing the composite of the composite temperature regulating layer and the elastic flax support layer.

[0028] (5) The surface antibacterial layer is pressed onto the composite temperature regulating layer of step (4) above, and hot pressing and needle punching are continued to form a composite structure of elastic flax support layer, composite temperature regulating layer and surface antibacterial layer from bottom to top, which is an antibacterial temperature regulating graphite flax comfort layer.

[0029] Preferably, the temperature for hot-press needle punching is 45-55℃, the pressure is 0.5-1.0MPa, and the setting time is 1-2min.

[0030] This invention provides an antibacterial and temperature-regulating graphite hemp comfort layer, which has the following advantages compared with the prior art:

[0031] This invention uses natural hemp fiber and acetate-modified hemp fiber in a certain proportion to prepare an elastic hemp support layer, which can effectively ensure the overall support and elasticity of the comfort layer and overcome the problem of poor elasticity and easy deformation of natural hemp. At the same time, a composite temperature-regulating layer and a surface antibacterial layer are made by using phase change fiber material, acetate-modified hemp fiber and antibacterial modified hemp fiber. This can effectively store heat, keep warm and control temperature. The antibacterial modified hemp fiber prepared by preparing a glue solution with carboxymethyl cellulose, sodium alginate, silver nitrate, shea butter extract, nano-graphite tubes and food-grade glycerin can effectively inhibit bacteria and bacteria for a long time, and ensure the overall comfort of the comfort layer. This comprehensively improves the application value and commercial value of the comfort layer. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the comfort layer structure in an embodiment of the present invention;

[0033] In the diagram: 1. Elastic flax support layer; 2. Composite temperature regulating layer; 3. Surface antibacterial layer. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. 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.

[0035] Example 1:

[0036] Preparation of raw material fibers:

[0037] 1. Preparation of acetic acid modified hemp fiber:

[0038] (1) Boil the hemp fiber in boiling water for 25 minutes, then soak it in ice water for 15 minutes. Repeat the boiling and ice water soaking steps 4 times to obtain pretreated hemp fiber for later use.

[0039] (2) The pretreated hemp fiber was placed in an acetic acid solution with a pH of 3.5 and soaked in a water bath at 45°C for 35 minutes. Then the pH was adjusted to neutral, and the fiber was rinsed with ethanol and then dried in a microwave to obtain acetic acid modified hemp fiber.

[0040] 2. Preparation of phase change temperature-regulating fiber A:

[0041] (1) Polyvinylidene fluoride, nano Al2O3 and nano graphite tubes are mixed in a mass ratio of 100:0.1:0.2 to obtain a mixture. The mixture is placed in 5.5 times the volume of a mixed solvent (the mixed solvent is acetone and N,N-dimethylacetamide mixed in a mass ratio of 1.8:1) and stirred in a water bath at 75°C for 20 min to obtain a fiber shell liquid for later use.

[0042] (2) After heating dodecanoate to a liquid state, it is added to a 10 ml syringe connected to the capillary inside the coaxial needle as the fiber core liquid. The fiber shell liquid is placed into a 10 ml syringe connected to the outer shell of the coaxial spinning needle, and then injected into the coaxial spinning needle. The inner and outer needle specifications are 22G and 17G, respectively. The fiber shell liquid is controlled at 0.07 mm / min, the fiber core liquid flow rate is 0.009 mm / min, the spinning voltage is 15 KV, the spinning distance is 12 cm, and the spinning temperature is 35℃ to obtain phase change temperature-regulating fiber A.

[0043] 3. Preparation of phase change temperature-regulating fiber B:

[0044] (1) Mix polyvinylidene fluoride and nano Al2O3 at a mass ratio of 100:0.1 to obtain a mixture. Place the mixture in 5.5 times its volume of mixed solvent (the mixed solvent is acetone and N,N-dimethylacetamide mixed at a mass ratio of 1.8:1) and stir in a water bath at 75°C for 20 min to obtain a fiber shell liquid for later use.

[0045] (2) After heating dodecanoate to a liquid state, it is added to a 10 ml syringe connected to the capillary inside the coaxial needle as the fiber core liquid. The fiber shell liquid is placed into a 10 ml syringe connected to the outer shell of the coaxial spinning needle, and then injected into the coaxial spinning needle. The inner and outer needle specifications are 22G and 17G, respectively. The fiber shell liquid is controlled at 0.07 mm / min, the fiber core liquid flow rate is 0.009 mm / min, the spinning voltage is 15 KV, the spinning distance is 12 cm, and the spinning temperature is 35℃ to obtain phase change temperature-regulating fiber B.

[0046] 4. Preparation of antibacterial modified flax fiber A:

[0047] (1) Shea butter was dried to constant weight at 50°C and then pulverized through an 80-mesh sieve to obtain powder. The powder was added to 7 times the volume of 60% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the residue was added to 7 times the volume of 70% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the residue was added to 7 times the volume of 85% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the three filtrates were combined, concentrated under vacuum, and freeze-dried to obtain shea butter extract.

[0048] (2) Prepare materials according to the following mass ratio: carboxymethyl cellulose: sodium alginate: silver nitrate: shea butter extract: nano-graphite tube: food grade glycerin = 8:1:0.1:0.4:0.1:3;

[0049] (3) Mix shea butter extract and nano-graphite tubes and add them to 4 times the volume of deionized water. Stir well and then add food-grade glycerin dropwise while stirring at 1200 r / min during the dropwise addition. The resulting mixture is ready for use.

[0050] (4) Mix carboxymethyl cellulose, sodium alginate, silver nitrate and the mixture, then add 4 times the volume of deionized water, stir at 1000 r / min for 10 min to obtain a mixed gel solution for later use.

[0051] (5) Soak the hemp fiber in an alkaline solution with pH 9 for 30 minutes, then take it out, rinse it with ethanol, soak it in the mixed glue solution for 20 minutes, take it out, roll it to remove excess mixed glue solution, comb it out and dry it to obtain antibacterial modified hemp fiber A.

[0052] 5. Preparation of antibacterial modified flax fiber B:

[0053] The preparation method is basically the same as that of the above-mentioned antibacterial modified hemp fiber A, except for the difference in step (1):

[0054] (1) Shea butter was dried to constant weight at 50°C and then pulverized through an 80-mesh sieve to obtain powder. The powder was added to 7 times the volume of 60% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. The residue was then filtered. The residue was added to 7 times the volume of 60% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. The residue was then filtered. The three filtrates were combined, concentrated under vacuum, and freeze-dried to obtain shea butter extract.

[0055] 6. Preparation of antibacterial modified flax fiber C:

[0056] The preparation method is basically the same as that of the above-mentioned antibacterial modified hemp fiber A, except for the difference in step (1):

[0057] (1) Shea butter was dried to constant weight at 50°C and then pulverized and passed through an 80-mesh sieve to obtain powder. The powder was added to 7 times the volume of 70% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the residue was added to 7 times the volume of 70% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the residue was added to 7 times the volume of 70% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the three filtrates were combined, concentrated under vacuum, and freeze-dried to obtain shea butter extract.

[0058] 7. Preparation of antibacterial modified flax fiber D:

[0059] The preparation method is basically the same as that of the above-mentioned antibacterial modified hemp fiber A, except for the difference in step (1):

[0060] (1) Shea butter was dried to constant weight at 50°C and then pulverized and passed through an 80-mesh sieve to obtain powder. The powder was added to 7 times the volume of 85% ethanol solution and extracted by ultrasonication at 600W for 25 min. After filtration, the residue was added to 7 times the volume of 85% ethanol solution and extracted by ultrasonication at 600W for 25 min. After filtration, the residue was added to 7 times the volume of 85% ethanol solution and extracted by ultrasonication at 600W for 25 min. After filtration, the three filtrates were combined, concentrated under vacuum, and freeze-dried to obtain shea butter extract.

[0061] 8. Preparation of antibacterial modified hemp fiber E:

[0062] The preparation method is basically the same as that of the above-mentioned antibacterial modified hemp fiber A, except for the differences in steps (2) and (3):

[0063] (2) Prepare materials according to the following mass ratio: carboxymethyl cellulose: sodium alginate: silver nitrate: shea butter extract: food grade glycerin = 8:1:0.1:0.4:3;

[0064] (3) Add shea butter extract to 4 times the volume of deionized water, stir thoroughly, then add food-grade glycerin dropwise, stirring at 1200 r / min during the dropwise addition process, and obtain a mixture for later use.

[0065] 9. Preparation of antibacterial modified flax fiber F:

[0066] (1) Shea butter was dried to constant weight at 50°C and then pulverized through an 80-mesh sieve to obtain powder. The powder was added to 7 times the volume of 60% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the residue was added to 7 times the volume of 70% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the residue was added to 7 times the volume of 85% ethanol solution and extracted by ultrasonication at 600W for 25 minutes. After filtration, the three filtrates were combined, concentrated under vacuum, and freeze-dried to obtain shea butter extract.

[0067] (2) Mix carboxymethyl cellulose, sodium alginate, silver nitrate, shea butter extract and nano-graphite tubes in a mass ratio of 8:1:0.1:0.4:0.1, then add 6 times the volume of deionized water and stir at 1000 r / min for 10 min to obtain a mixed adhesive solution for later use.

[0068] (3) Soak the hemp fiber in an alkaline solution with pH 9 for 30 minutes, then take it out, rinse it with ethanol, soak it in the mixed glue solution for 20 minutes, take it out, roll it to remove excess mixed glue solution, comb it out, and then dry it to obtain antibacterial modified hemp fiber F.

[0069] Example 2:

[0070] The antibacterial properties of the above-mentioned antibacterial modified flax fibers were tested using common pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, and Candida albicans as test bacteria.

[0071] Configure 10 respectively 8 CFU / mL *Escherichia coli* suspension, *Staphylococcus aureus* suspension, and *Candida albicans* suspension were prepared. Antimicrobial modified flax fiber for each group was pulverized through a 100-mesh sieve, sterilized by UV light, and then added to the bacterial suspensions (10% by mass). A control group was set up without the added antimicrobial modified flax fiber. After thorough mixing, 2 mL of the mixture was evenly spread onto agar plates and incubated under suitable conditions. Viable cell counts were calculated at 24 h and 72 h, and the inhibition rate was calculated with reference to the control group. The specific results are shown in Tables 1-2 below.

[0072] Table 1. Antibacterial rate of each group of antibacterial modified hemp fiber after 24 hours

[0073]

[0074] Table 2. Antibacterial rate of antibacterial modified hemp fiber in each group after 72 hours.

[0075]

[0076] The above tests show that antibacterial modified flax fiber A has a better antibacterial effect and better overall antibacterial stability.

[0077] Example 3:

[0078] Preparation of antibacterial and thermoregulating graphite hemp comfort layer:

[0079] (1) Mix ordinary flax fiber and acetic acid modified flax fiber evenly (ordinary flax fiber accounts for 35% and acetic acid modified flax fiber accounts for 65%), and form an elastic flax support layer after carding, web laying and needle punching.

[0080] (2) The phase change temperature regulating fiber A and the acetate modified hemp fiber are mixed evenly (the phase change temperature regulating fiber A accounts for 55% and the acetate modified hemp fiber accounts for 45%), and after carding, web laying and needle punching, a composite temperature regulating layer is formed.

[0081] (3) Mix phase change temperature regulating fiber A and antibacterial modified flax fiber A evenly (phase change temperature regulating fiber A accounts for 25% and antibacterial modified flax fiber A accounts for 75%), and form a surface antibacterial layer after carding, web laying and needle punching.

[0082] (4) Place the elastic flax support layer inside the rectangular enclosure, then cover the composite temperature regulating layer on the elastic flax support layer, and hot press and needle punch to shape (control the temperature at 50℃, the pressure at 0.8Mpa, and the time at 1.5min) to complete the composite of the composite temperature regulating layer and the elastic flax support layer.

[0083] (5) Press the surface antibacterial layer onto the composite temperature-regulating layer of step (4) above, and continue hot pressing and needle punching to shape the layer. The temperature is controlled at 50°C, the pressure is 0.8 MPa, and the time is 1.5 min. This forms a composite structure of elastic flax support layer, composite temperature-regulating layer and surface antibacterial layer from bottom to top, which is an antibacterial temperature-regulating graphite flax comfort layer.

[0084] Comparative Example 1:

[0085] Preparation of antibacterial and thermoregulating graphite hemp comfort layer:

[0086] The preparation method in this comparative example is the same as in Example 3, except that the acetic acid modified hemp fiber is replaced with ordinary hemp fiber.

[0087] Comparative Example 2:

[0088] Preparation of antibacterial and thermoregulating graphite hemp comfort layer:

[0089] The preparation method in this comparative example is the same as in Example 3, except that ordinary hemp fiber is replaced with acetic acid modified hemp fiber.

[0090] Comparative Example 3:

[0091] Preparation of antibacterial and thermoregulating graphite hemp comfort layer:

[0092] The preparation method in this comparative example is the same as in Example 3, except that phase change temperature regulating fiber A is replaced with phase change temperature regulating fiber B.

[0093] Comparative Example 4:

[0094] Preparation of antibacterial and thermoregulating graphite hemp comfort layer:

[0095] The preparation method in this comparative example is the same as in Example 3, except that phase change temperature-regulating fiber A is replaced with acetic acid modified hemp fiber.

[0096] Detection:

[0097] Referring to the preparation methods of Example 3 and Comparative Examples 1-4 above, the thickness of the comfort layer in each group was set to 4 cm, the thickness of the elastic hemp support layer was 2 cm, the thickness of the composite temperature regulating layer was 1 cm, and the thickness of the surface antibacterial layer was 1 cm.

[0098] 1. 80 kg / m² is used for each comfort layer group. 2 The comfort layer was pressed under normal temperature and pressure for 48 hours, then the pressure was removed, and the height h of each group was measured after 5 min, 10 min, 20 min, and 40 min of rest. The rebound rate was calculated (rebound rate = h / 10 × 100%). The specific test results are shown in Table 3 below:

[0099] Table 3

[0100]

[0101] As shown in the table above, the comfort layer prepared by mixing acetate-modified flax fiber and ordinary flax fiber in Example 3 has the best overall resilience and can achieve rapid rebound. In Comparative Example 1, the acetate-modified flax fiber was replaced with ordinary flax fiber, resulting in poor overall resilience. In Comparative Example 2, the ordinary flax fiber was replaced with acetate-modified flax fiber, which had good early resilience but was prone to permanent deformation. In addition, the use of phase change temperature-regulating fiber A can also ensure the resilience of the comfort layer to a certain extent.

[0102] 2. Temperature conduction detection:

[0103] A constant temperature bag at 40℃ was placed on each comfort layer, and the temperature at the center point of the comfort layer was monitored in real time. After the temperature at the center point reached 40℃, the insulation bag was removed, and the time it took for the temperature at the center point to drop back to normal was measured. The specific results are shown in Table 4 below:

[0104] Table 4

[0105]

[0106] As shown in the table above, the comfort layer prepared in Example 3 can be quickly adjusted to the contact temperature and has a good heat storage effect, which can improve the overall comfort of the comfort layer.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An antibacterial and temperature-regulating graphite hemp comfort layer, characterized in that, The comfort layer consists of an elastic hemp support layer, a composite temperature regulating layer, and a surface antibacterial layer arranged sequentially from bottom to top. The elastic flax support layer is composed of ordinary flax fibers and acetate-modified flax fibers; The composite temperature-regulating layer is composed of phase change temperature-regulating fibers and acetate-modified flax fibers; The surface antibacterial layer is composed of phase change temperature-regulating fibers and antibacterial modified flax fibers; The acetic acid modified hemp fiber is obtained by steaming hemp fiber, soaking it in acetic acid, adjusting the pH to neutral, removing it, and then drying it in a microwave. The phase change temperature-regulating fiber is an electrospun fiber composed of dodecanoic acid dodecyl ester / polyvinylidene fluoride / nano Al2O3 / nano graphite tube. The antibacterial modified hemp fiber is prepared by alkali treatment of hemp fiber, soaking it in a solution made of carboxymethyl cellulose, sodium alginate, silver nitrate, shea butter extract, nano-graphite tubes, and food-grade glycerin, and then drying it. The shea butter extract is prepared by drying and pulverizing shea butter, then extracting it in ethanol solutions of 60%, 70%, and 85% concentrations, and then drying it.

2. The antibacterial and temperature-regulating graphite hemp comfort layer according to claim 1, characterized in that, The specific preparation method of the acetic acid modified hemp fiber includes the following steps: S1-1. Boil hemp fiber in boiling water for 20-30 minutes, then soak it in ice water for 10-15 minutes. Repeat the boiling and ice water soaking steps 3-5 times to obtain pretreated hemp fiber for later use. S1-2. Place the pretreated hemp fiber in an acetic acid solution with a pH of 3-4 and soak it in a water bath at 45-50℃ for 30-40 minutes. Then adjust the pH to neutral, rinse it with ethanol, and then microwave dry it to obtain acetic acid modified hemp fiber.

3. The antibacterial and temperature-regulating graphite hemp comfort layer according to claim 1, characterized in that, The specific preparation method of the phase change temperature-regulating fiber includes the following steps: S2-1. Mix polyvinylidene fluoride, nano-Al2O3 and nano-graphite tubes in a mass ratio of 100:0.1:0.2 to obtain a mixture. Place the mixture in 5-6 times its volume of mixed solvent and stir in a water bath at 70-80℃ to obtain a fiber shell liquid for later use. S2-2. Dodecanoic acid dodecyl ester, which becomes liquid after heating, is used as the fiber core liquid. The fiber core liquid and fiber shell liquid are added to a coaxial spinning machine for electrospinning. The flow rate of the fiber core liquid is controlled at 0.009 mm / min, the flow rate of the fiber shell liquid is 0.07 mm / min, the spinning voltage is 15 KV, and the spinning temperature is 35℃ to obtain phase change temperature-regulating fiber.

4. The antibacterial and temperature-regulating graphite hemp comfort layer according to claim 3, characterized in that: The mixed solvent is obtained by mixing acetone and N,N-dimethylacetamide in a mass ratio of 1.5-2:

1.

5. The antibacterial and temperature-regulating graphite hemp comfort layer according to claim 1, characterized in that, The preparation method of the antibacterial modified hemp fiber includes the following steps: S3-1. Preparation of shea butter extract: Shea butter is dried to constant weight at 45-50℃ and then pulverized through an 80-mesh sieve to obtain powder. The powder is added to 5-8 times its volume of 60% ethanol solution, ultrasonically extracted, and then filtered. The residue is added to 5-8 times its volume of 70% ethanol solution, ultrasonically extracted again, and then filtered. The residue is added to 5-8 times its volume of 85% ethanol solution, ultrasonically extracted again, and then filtered. The three filtrates are combined, vacuum concentrated, and then freeze-dried to obtain shea butter extract. S3-2. Prepare materials according to the following mass ratio: carboxymethyl cellulose: sodium alginate: silver nitrate: shea butter extract: nano-graphite tube: food-grade glycerin = 8:1:0.1:0.4:0.1:3; S3-3. Mix shea butter extract and nano-graphite tubes and add them to 3-5 times the volume of deionized water. Stir thoroughly and then add food-grade glycerin dropwise while stirring at 1200-1400 r / min. The resulting mixture is ready for use. S3-4. Mix carboxymethyl cellulose, sodium alginate, silver nitrate and the mixture, then add 3-5 times the volume of deionized water, stir at 800-1000 r / min for 10-15 min to obtain a mixed gel solution for later use. S3-5. Soak the hemp fiber in an alkaline solution with a pH of 9-10 for 20-30 minutes, then remove it, rinse it with ethanol, and then soak it in the mixed adhesive solution for 20-30 minutes. Remove it, roll it to remove excess mixed adhesive solution, comb it out, and then dry it to obtain antibacterial modified hemp fiber.

6. The antibacterial and temperature-regulating graphite hemp comfort layer according to claim 5, characterized in that: In step S3-1, the ultrasonic extraction power is 400-600W, and the extraction time for a single extraction is 20-30 minutes.

7. The antibacterial and temperature-regulating graphite hemp comfort layer according to claim 1, characterized in that: The elastic flax support layer contains 30%-40% ordinary flax fiber and 60%-70% acetate-modified flax fiber; the composite temperature-regulating layer contains 50%-60% phase change temperature-regulating fiber and 40%-50% acetate-modified flax fiber; the surface antibacterial layer contains 20%-30% phase change temperature-regulating fiber and 70%-80% antibacterial modified flax fiber.

8. A method for preparing an antibacterial, temperature-regulating graphite hemp comfort layer as described in any one of claims 1-7, characterized in that, The preparation method includes the following steps: (1) Mix ordinary flax fiber and acetate-modified flax fiber evenly, and then form an elastic flax support layer after carding, web laying and needle punching. (2) The phase change temperature-regulating fiber and acetate-modified hemp fiber are mixed evenly, and then combed, laid and needle-punched to form a composite temperature-regulating layer; (3) The phase change temperature regulating fiber and antibacterial modified flax fiber are mixed evenly, and after carding, web laying and needle punching, an antibacterial surface layer is formed; (4) Place the elastic flax support layer inside the rectangular enclosure, then cover the composite temperature regulating layer on the elastic flax support layer, and hot press and needle punch to shape it, thus completing the composite of the composite temperature regulating layer and the elastic flax support layer. (5) The surface antibacterial layer is pressed onto the composite temperature regulating layer of step (4) above, and hot pressing and needle punching are continued to form a composite structure of elastic flax support layer, composite temperature regulating layer and surface antibacterial layer from bottom to top, which is an antibacterial temperature regulating graphite flax comfort layer.

9. The preparation method according to claim 8, characterized in that: The hot-press needle punching and shaping temperature is 45-55℃, the pressure is 0.5-1.0MPa, and the shaping time is 1-2min.

Images