Nanometer composite far-infrared health-care functional material and preparation method thereof

Abstract

The invention relates to the field of health-care materials, in particular to a nano-composite far-infrared health-care functional material and a preparation method thereof. The preparation method of the nano composite far-infrared health-care functional material comprises the following steps: step 1, preparing aminated tourmaline nano powder; step 2, preparing activated tourmaline nano powder; and step 3, preparing the modified tourmaline nano powder. The health-care functional material disclosed by the invention is prepared by taking tourmaline nano powder as a base material and carrying out surface composite modification on the tourmaline nano powder. The modified tourmaline nano powder prepared by the invention not only solves the problem of dispersibility of far infrared nano powder in traditional medical health care products (such as gel or liquid), but also enhances the application effect of the nano powder, enhances the firmness of the product, promotes wound healing, reduces pain and inflammation, prevents bacterial infection and the like.

Description

Technical Field

[0001] The present invention relates to the field of health-care materials, and in particular to a nano-composite far-infrared health-care functional material and a preparation method thereof. Background Art

[0002] Far-infrared nanopowder is a new nanocomposite far-infrared health-promoting material with unique physical properties and broad application potential. Far-infrared powder is typically made from minerals such as alumina, silica, and sodium silicate, through high-temperature calcination and nanotechnology. At room temperature, its infrared emissivity within the 2-18μm wavelength range reaches 92%, and its particle size can be controlled between 80 nanometers and 1250 mesh. It combines an ultrafine nanostructure with chemical stability. Its radiant energy matches the human body's natural far-infrared wavelength, allowing it to be efficiently absorbed and converted into a warming effect.

[0003] Far-infrared nanopowders work by dilating capillaries to accelerate blood flow, increasing normal microcirculatory blood flow by 2-3 times and significantly improving tissue oxygen supply. They also activate biomolecules, promote the excretion of sweat and toxins, enhance metabolic efficiency, and improve sub-health conditions such as fatigue and insomnia. They also soothe joint pain and muscle soreness caused by sports injuries and chronic strain, relaxing tense muscles and reducing lactic acid accumulation. Some products inhibit the release of inflammatory factors and accelerate wound healing through physical heating, providing a therapeutic aid for superficial inflammation of the skin. They can also effectively decompose harmful substances such as formaldehyde, ammonia, and sulfides in synergy with ultraviolet light, combining air purification and sterilization capabilities.

[0004] Far-infrared nanopowders are suitable for making far-infrared fibers, far-infrared thermal underwear, far-infrared functional cards, far-infrared medical patches, ointments, far-infrared thermal and antibacterial clothing, far-infrared coatings, far-infrared paints, far-infrared ceramics, far-infrared self-heating products, far-infrared building materials, and far-infrared antibacterial packaging materials. In practical applications, the addition level of far-infrared powder is generally 3-20%, with the specific amount varying depending on the characteristics of the product.

[0005] When using far-infrared nanopowder to make plasters, larger particles will appear after being added to the glue. This may be due to the uneven size of the nanopowder or the wide distribution resulting in poor dispersion, which will affect its effect and stability in practical applications. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a nano-composite far-infrared health-care functional material and a preparation method thereof.

[0007] The purpose of the present invention is achieved by adopting the following technical solutions:

[0008] In a first aspect, the present invention provides a method for preparing a nanocomposite far-infrared health-care functional material, comprising the following steps:

[0009] Step 1, preparing amination tourmaline nanopowder:

[0010] A mixed solvent of ethanol and deionized water is prepared, and then tourmaline nanopowder and silane coupling agent KH-550 are added to the mixed solvent. The mixture is first ultrasonicated at room temperature for 5-10 minutes, then transferred to a water bath, kept stirred at 60-80°C for 4-10 hours, centrifuged and the solid is collected, washed with water, and dried to obtain amination tourmaline nanopowder.

[0011] Step 2, preparing activated tourmaline nanopowder:

[0012] S1, mixing the aminated tourmaline nanopowder and N,N-dimethylformamide, and ultrasonically homogenizing at room temperature to obtain an aminated tourmaline nanopowder solution;

[0013] S2. Add 4-methacrylamidosalicylic acid to N,N-dimethylformamide, stir evenly in an ice-water bath, introduce nitrogen as a protective gas, add 1-ethyl-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide in sequence, and stir for 0.5-1 h to obtain an activated reaction solution;

[0014] S3, the activation reaction solution was heated to room temperature, and NH2-NPS solution was added dropwise under the condition of protection from light, and stirring was performed while adding dropwise. After the addition was completed, stirring was performed for 24-48 hours. After the reaction was completed, the solid was collected by centrifugation, washed and dried to obtain activated tourmaline nanopowder;

[0015] Step 3, preparing modified tourmaline nanopowder:

[0016] Mix 2-hydroxyethyl acrylate and anhydrous ethanol, stir thoroughly, add activated tourmaline nanopowder, ultrasonicate at room temperature for 5-10 minutes, add an azo initiator under nitrogen protection, stir at 70-80°C for 24-48 hours, cool to room temperature after the reaction, wash three times with methanol, and vacuum dry to obtain modified tourmaline nanopowder;

[0017] Preferably, in step 1, the particle size of the tourmaline nanopowder is 100-500 nanometers.

[0018] Preferably, in step 1, the mass volume ratio of tourmaline nanopowder, KH-550, deionized water and ethanol is 1 g: (0.11-0.33) g: (10-20) mL: (5-15) mL.

[0019] Preferably, in S1 of step 2, the mass volume ratio of the aminated tourmaline nanopowder and N,N-dimethylformamide is 1 g:(10-20) mL.

[0020] Preferably, in S2 of step 2, the mass volume ratio of 4-methylacrylamidosalicylic acid, 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC), N-hydroxysuccinimide (NHS) and N,N-dimethylformamide is 1 g:(0.72-0.93) (0.81) g:(0.69-0.85) (0.78) g:(10-20) mL.

[0021] Preferably, in S3 of step 2, the volume ratio of the amination tourmaline nanopowder solution to the activation reaction solution is 1:2.1-3.6.

[0022] Preferably, in step 3, the mass volume ratio of activated tourmaline nanopowder, 2-hydroxyethyl acrylate and anhydrous ethanol is 1 g: (0.23-0.46) (0.35) g: (10-20) mL.

[0023] Preferably, in step 3, the azo initiator is AIBN (azobisisobutyronitrile) or ABVN (azobisisoheptanenitrile), and the added amount is 1.8%-3.6% of the mass of the activated tourmaline nanopowder.

[0024] In a second aspect, the present invention provides a nano-composite far-infrared health-care functional material, which is prepared by the above-mentioned preparation method.

[0025] The beneficial effects of the present invention are:

[0026] The present invention prepares a nanocomposite far-infrared health-care functional material. This material is prepared by surface-compositely modifying tourmaline nanopowder as a base material. The modified tourmaline nanopowder prepared in the present invention not only solves the dispersibility issues of far-infrared nanopowders in traditional health-care products (such as gels or liquids), but also enhances their application effectiveness, improving product firmness, promoting wound healing, reducing pain and inflammation, and preventing bacterial infection.

[0027] 2. Tourmaline nanopowder, as a far-infrared nanopowder material, has high negative ion production and far-infrared emissivity. It emits far-infrared rays in the 4–14μm band at room temperature, promoting heat transfer and microcirculation. When used in healthcare products such as plasters, it can regulate the body's ion balance, promote physical and mental relaxation, activate cells, enhance natural healing rates, and inhibit oxidation and aging.

[0028] 3. The present invention modifies tourmaline nanopowder, retaining its far-infrared emission, negative ion release, and trace element release capabilities while also exhibiting improved dispersibility, strength, and application effectiveness. The core-shell structure formed by the polymerization of acrylamide on the tourmaline surface increases the tourmaline's decomposition temperature, and the resulting hydrophilic gel continuously provides a water environment for the tourmaline. The sulfonamide group charge synergizes with the tourmaline's electrostatic field, increasing negative ion release by 30%-40% in an environment with 60% humidity. Furthermore, the salicylamide groups on the tourmaline surface have antipyretic and analgesic effects, assisting tourmaline in treating fever-induced headaches, neuralgia, arthralgia, and active rheumatism.

[0029] 4. Compared with traditional far-infrared nanopowders, the nanocomposite far-infrared health-care functional materials prepared by the present invention have the advantages of dispersibility, mechanical strength and environmental responsiveness. They can be applied to a variety of products with ophthalmic health care effects, such as eye masks, eye patches, functional glasses frame materials, etc. In addition, they can also be used in daily necessities such as plasters, knee pads, and insoles. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the presence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be regarded as the scope of the present invention.

[0031] In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0032] The present invention will be further described below with reference to the following examples.

[0033] Example 1

[0034] A method for preparing a nanocomposite far-infrared health-care functional material comprises the following steps:

[0035] Step 1, preparing amination tourmaline nanopowder:

[0036] Prepare a mixed solvent of 10 mL of ethanol and 15 mL of deionized water, then add 1 g of tourmaline nanopowder NPS with a particle size of 300 nm and 0.22 g of silane coupling agent KH-550 to the mixed solvent, first ultrasonicate at room temperature for 8 minutes, then transfer to a water bath, keep stirring at 70°C for 7 hours, centrifuge and collect the solid, wash with water and dry to obtain amination tourmaline nanopowder NH2-NPS;

[0037] Step 2, preparing activated tourmaline nanopowder:

[0038] S1. Mix 1 g of NH2-NPS and 15 mL of N,N-dimethylformamide, and ultrasonicate at room temperature to obtain an NH2-NPS solution.

[0039] S2. 1 g of 4-methacrylamidosalicylic acid was added to 15 mL of N,N-dimethylformamide, and the mixture was stirred in an ice-water bath. Nitrogen was introduced as a protective gas, and 0.78 g of N-hydroxysuccinimide (NHS) and 0.81 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC) were added in sequence. After stirring for 0.5 h, an activation reaction solution was obtained.

[0040] S3. Warm the activation reaction solution to room temperature, and add NH2-NPS solution dropwise under light-shielding conditions. The volume ratio of NH2-NPS solution to activation reaction solution is 1:2.8. Stir while adding dropwise. After the addition is complete, stir at a speed of 300 r / min for 36 hours. After the reaction is completed, centrifuge and collect the solid, wash and dry to obtain AMSa-NPS;

[0041] Step 3, preparing modified tourmaline nanopowder:

[0042] 0.35 g of 2-hydroxyethyl acrylate and 15 mL of anhydrous ethanol were mixed and stirred thoroughly. Then, 1 g of AMSa-NPS was added. The mixture was ultrasonicated at room temperature for 5-10 min. Under nitrogen protection, 2.4% thermal initiator AIBN (azobisisobutyronitrile) by weight of AMSa-NPS was added. The mixture was stirred at 75°C for 36 h. After the reaction was completed, the mixture was cooled to room temperature, the solid was collected by centrifugation, washed three times with methanol, and vacuum dried to obtain modified tourmaline nanopowder, i.e., nanocomposite far-infrared health-care functional material.

[0043] Example 2

[0044] A method for preparing a nanocomposite far-infrared health-care functional material comprises the following steps:

[0045] Step 1, preparing amination tourmaline nanopowder:

[0046] Prepare a mixed solvent of 5 mL of ethanol and 10 mL of deionized water, then add 1 g of 100 nm tourmaline nanopowder NPS and 0.11 g of silane coupling agent KH-550 to the mixed solvent, first ultrasonicate at room temperature for 5 minutes, then transfer to a water bath, keep stirring at 60°C for 4 hours, centrifuge and collect the solid, wash with water and dry to obtain amination tourmaline nanopowder NH2-NPS;

[0047] Step 2, preparing activated tourmaline nanopowder:

[0048] S1. Mix 1 g of NH2-NPS and 10 mL of N,N-dimethylformamide, and ultrasonicate at room temperature to obtain an NH2-NPS solution.

[0049] S2. 1 g of 4-methacrylamidosalicylic acid was added to 10 mL of N,N-dimethylformamide, and the mixture was stirred in an ice-water bath. Nitrogen was introduced as a protective gas, and 0.69 g of N-hydroxysuccinimide (NHS) and 0.72 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC) were added in sequence. After stirring for 0.5 h, an activation reaction solution was obtained.

[0050] S3. Warm the activation reaction solution to room temperature, and add NH2-NPS solution dropwise in a light-shielding condition. The volume ratio of NH2-NPS solution to activation reaction solution is 1:2.1. Stir while adding dropwise. After the addition is complete, stir at a speed of 200 r / min for 24 h. After the reaction is completed, centrifuge and collect the solid, wash and dry it to obtain AMSa-NPS.

[0051] Step 3, preparing modified tourmaline nanopowder:

[0052] 0.23 g of 2-hydroxyethyl acrylate and 10 mL of anhydrous ethanol were mixed and stirred thoroughly. Then, 1 g of AMSa-NPS was added. The mixture was ultrasonicated at room temperature for 5 min. Under nitrogen protection, 1.8% thermal initiator AIBN (azobisisobutyronitrile) based on the mass of AMSa-NPS was added. The mixture was stirred at 70°C for 24 h. After the reaction was completed, the mixture was cooled to room temperature, washed with methanol three times, and vacuum dried to obtain modified tourmaline nanopowder, i.e., nano-composite far-infrared health-care functional material.

[0053] Example 3

[0054] A method for preparing a nanocomposite far-infrared health-care functional material comprises the following steps:

[0055] Step 1, preparing amination tourmaline nanopowder:

[0056] Prepare a mixed solvent of 15 mL of ethanol and 20 mL of deionized water, then add 1 g of 500 nm tourmaline nanopowder NPS and 0.33 g of silane coupling agent KH-550 to the mixed solvent, first ultrasonicate at room temperature for 10 minutes, then transfer to a water bath, keep stirring at 80°C for 10 hours, centrifuge and collect the solid, wash with water and dry to obtain amination tourmaline nanopowder NH2-NPS;

[0057] Step 2, preparing activated tourmaline nanopowder:

[0058] S1. Mix 1 g of NH2-NPS and 20 mL of N,N-dimethylformamide, and ultrasonicate at room temperature to obtain an NH2-NPS solution.

[0059] S2. 1 g of 4-methacrylamidosalicylic acid was added to 20 mL of N,N-dimethylformamide, and the mixture was stirred uniformly in an ice-water bath. Nitrogen was introduced as a protective gas, and 0.85 g of N-hydroxysuccinimide (NHS) and 0.93 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC) were added in sequence. After stirring for 1 h, an activation reaction solution was obtained.

[0060] S3. Warm the activation reaction solution to room temperature, and add NH2-NPS solution dropwise under light-shielding conditions. The volume ratio of NH2-NPS solution to activation reaction solution is 1:3.6. Stir while adding dropwise. After the addition is complete, stir at a speed of 500 r / min for 48 h. After the reaction is completed, centrifuge and collect the solid, wash and dry to obtain AMSa-NPS;

[0061] Step 3, preparing modified tourmaline nanopowder:

[0062] 0.46 g of 2-hydroxyethyl acrylate and 20 mL of anhydrous ethanol were mixed and stirred thoroughly, and then 1 g of AMSa-NPS was added. The mixture was ultrasonicated at room temperature for 10 minutes. Under nitrogen protection, 3.6% thermal initiator AIBN (azobisisobutyronitrile) of the mass of AMSa-NPS was added, and the mixture was stirred at 80°C for 48 hours. After the reaction was completed, the mixture was cooled to room temperature, washed with methanol three times, and vacuum dried to obtain modified tourmaline nanopowder, i.e., nano-composite far-infrared health-care functional material.

[0063] Example 4

[0064] A method for preparing a nanocomposite far-infrared health-care functional material comprises the following steps:

[0065] Step 1, preparing amination tourmaline nanopowder:

[0066] Prepare a mixed solvent of 10 mL of ethanol and 15 mL of deionized water, then add 1 g of 300 nm tourmaline nanopowder NPS and 0.22 g of silane coupling agent KH-550 to the mixed solvent, first ultrasonicate at room temperature for 10 minutes, then transfer to a water bath, keep stirring at 80°C for 5 hours, centrifuge and collect the solid, wash with water and dry to obtain amination tourmaline nanopowder NH2-NPS;

[0067] Step 2, preparing activated tourmaline nanopowder:

[0068] S1. Mix 1 g of NH2-NPS and 15 mL of N,N-dimethylformamide, and ultrasonicate at room temperature to obtain an NH2-NPS solution.

[0069] S2. 1 g of 4-methacrylamidosalicylic acid was added to 15 mL of N,N-dimethylformamide, and the mixture was stirred in an ice-water bath. Nitrogen was introduced as a protective gas, and 0.72 g of N-hydroxysuccinimide (NHS) and 0.78 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC) were added in sequence. After stirring for 0.5 h, an activation reaction solution was obtained.

[0070] S3. Warm the activation reaction solution to room temperature, and add NH2-NPS solution dropwise in a light-shielding condition. The volume ratio of NH2-NPS solution to activation reaction solution is 1:2.5. Stir while adding dropwise. After the addition is complete, stir at a speed of 300 r / min for 30 h. After the reaction is completed, centrifuge and collect the solid, wash and dry it to obtain AMSa-NPS.

[0071] Step 3, preparing modified tourmaline nanopowder:

[0072] 0.32 g of 2-hydroxyethyl acrylate and 12 mL of anhydrous ethanol were mixed and stirred thoroughly. Then, 1 g of AMSa-NPS was added and ultrasonicated at room temperature for 10 min. Under nitrogen protection, 2.1% thermal initiator AIBN (azobisisobutyronitrile) of the mass of AMSa-NPS was added. The mixture was stirred at 75°C for 32 h. After the reaction was completed, the mixture was cooled to room temperature, washed with methanol three times, and vacuum dried to obtain modified tourmaline nanopowder, i.e., nano-composite far-infrared health-care functional material.

[0073] Example 5

[0074] A method for preparing a nanocomposite far-infrared health-care functional material comprises the following steps:

[0075] Step 1, preparing amination tourmaline nanopowder:

[0076] Prepare a mixed solvent of 10 mL of ethanol and 15 mL of deionized water, then add 1 g of 200 nm tourmaline nanopowder NPS and 0.18 g of silane coupling agent KH-550 to the mixed solvent, first sonicate at room temperature for 7 minutes, then transfer to a water bath, keep stirring at 70°C for 8 hours, centrifuge and collect the solid, wash with water and dry to obtain ammoniated tourmaline nanopowder NH2-NPS;

[0077] Step 2, preparing activated tourmaline nanopowder:

[0078] S1. Mix 1 g of NH2-NPS and 15 mL of N,N-dimethylformamide, and ultrasonicate at room temperature to obtain an NH2-NPS solution.

[0079] S2. 1 g of 4-methacrylamidosalicylic acid was added to 15 mL of N,N-dimethylformamide, and the mixture was stirred in an ice-water bath. Nitrogen was introduced as a protective gas, and 0.83 g of N-hydroxysuccinimide (NHS) and 0.9 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide (EDC) were added in sequence. After stirring for 1 h, an activation reaction solution was obtained.

[0080] S3. Warm the activation reaction solution to room temperature, and add NH2-NPS solution dropwise in a light-shielding condition. The volume ratio of NH2-NPS solution to activation reaction solution is 1:3. Stir while adding dropwise. After the addition is complete, stir at a speed of 200 r / min for 48 h. After the reaction is completed, centrifuge and collect the solid, wash and dry it to obtain AMSa-NPS.

[0081] Step 3, preparing modified tourmaline nanopowder:

[0082] 0.41 g of 2-hydroxyethyl acrylate and 15 mL of anhydrous ethanol were mixed and stirred thoroughly, and then 1 g of AMSa-NPS was added. The mixture was ultrasonicated at room temperature for 10 min. Under nitrogen protection, 3.2% thermal initiator AIBN (azobisisobutyronitrile) of the mass of AMSa-NPS was added, and the mixture was stirred at 80°C for 24 h. After the reaction was completed, the mixture was cooled to room temperature, washed with methanol three times, and vacuum dried to obtain modified tourmaline nanopowder, i.e., nano-composite far-infrared health-care functional material.

[0083] Comparative Example 1

[0084] A preparation method of a far-infrared health-care functional material, which differs from Example 1 in that traditional 300-nanometer tourmaline nanopowder NPS is used.

[0085] Comparative Example 2

[0086] A method for preparing a nano-composite far-infrared health-care functional material, which differs from Example 1 in that amino-treated tourmaline nanopowder is used, comprises the following steps:

[0087] Prepare a mixed solvent of 10 mL of ethanol and 15 mL of deionized water, then add 1 g of 300 nm tourmaline nanopowder NPS and 0.22 g of silane coupling agent KH-550 into the mixed solvent, first ultrasonicate at room temperature for 8 minutes, then transfer to a water bath, keep stirring at 70°C for 7 hours, centrifuge and collect the solid, wash with water and dry to obtain amino tourmaline nanopowder NH2-NPS.

[0088] Comparative Example 3

[0089] A method for preparing a nanocomposite far-infrared health-care functional material, which differs from Example 1 in that 4-methacrylamidosalicylic acid is not added, comprises the following steps:

[0090] Step 1, preparing amination tourmaline nanopowder:

[0091] Prepare a mixed solvent of 10 mL of ethanol and 15 mL of deionized water, then add 1 g of 300 nm tourmaline nanopowder NPS and 0.22 g of silane coupling agent KH-550 to the mixed solvent, first ultrasonicate at room temperature for 8 minutes, then transfer to a water bath, keep stirring at 70°C for 7 hours, centrifuge and collect the solid, wash with water and dry to obtain amination tourmaline nanopowder NH2-NPS;

[0092] Step 2, preparing modified tourmaline nanopowder:

[0093] 0.35 g of 2-hydroxyethyl acrylate and 15 mL of anhydrous ethanol were mixed and stirred thoroughly. Then, 1 g of NH2-NPS was added. The mixture was ultrasonicated at room temperature for 5-10 min. Under nitrogen protection, 2.4% thermal initiator AIBN (azobisisobutyronitrile) of the mass of NH2-NPS was added. The mixture was stirred at 75°C for 36 h. After the reaction was completed, the mixture was cooled to room temperature, washed with methanol three times, and vacuum dried to obtain modified tourmaline nanopowder, i.e., nano-composite far-infrared health-care functional material.

[0094] In order to more clearly illustrate the contents of the present invention, the performance of the far-infrared health-care functional materials prepared in Example 1 and Comparative Examples 1-3 of the present invention was tested, including the far-infrared wavelength range and normal emissivity. In addition, with Comparative Example 1 as the control standard, the compressive strength improvement rate and the aqueous suspension stability improvement rate of Example 1, Comparative Example 2 and Comparative Example 3 were respectively tested.

[0095] Among them, the detection of far-infrared wavelength range and normal emissivity refers to the measurement standard CAS115-2005 "Health Functional Textiles"; the negative ion release refers to SN / T 2558.2-2011 "Test Methods for Import and Export Functional Textiles" Part 2: Standard Measurement of Negative Ion Content (indoor static environment, humidity 60%, temperature 25°C).

[0096] The test results are shown in Table 1:

[0097] Table 1 Performance of different infrared health functional materials

[0098] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Far infrared wavelength range 4~14μm 4~14μm 4~14μm 4~14μm Normal emissivity 0.98 0.90 0.92 0.95 <![CDATA[Negative ion release amount (ions / cm 3 )]]> 4459 3328 3672 4205 Compressive strength improvement rate 28％-36％ / 2％-5％ 15％-25％ Suspension stability improvement rate 50％-60％ / 30％-40％ 50％-60％

[0099] As shown in Table 1, compared to Comparative Example 1, the nanocomposite far-infrared health-care functional material prepared in Example 1 of the present invention has a higher normal emissivity, indicating that it has a strong thermal radiation capacity and can more effectively transfer heat. The negative ion release rate is also significantly increased, by 30%-40%. In addition, the compressive strength and suspension stability are also significantly improved.

[0100] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0101] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a nanocomposite far-infrared health-care functional material, characterized in that: The following steps are involved: Step 1, preparing amination tourmaline nanopowder: A mixed solvent of ethanol and deionized water is prepared, and then tourmaline nanopowder and silane coupling agent KH-550 are added to the mixed solvent, ultrasonically homogenized at room temperature, and then heated. After that, the mixture is centrifuged, washed with water, and dried to obtain amino tourmaline nanopowder. Step 2, preparing activated tourmaline nanopowder: S1. Adding aminated tourmaline nanopowder to N,N-dimethylformamide to prepare an aminated tourmaline nanopowder solution; S2. Add 4-methacrylamidosalicylic acid to N,N-dimethylformamide, and then add 1-ethyl-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide, and stir evenly to obtain an activation reaction solution; S3, mixing the activation reaction solution and the aminated tourmaline nanopowder solution, stirring for 24-48 hours, and after the reaction is completed, centrifuging, washing and drying to obtain activated tourmaline nanopowder; Step 3, preparing modified tourmaline nanopowder: Mix 2-hydroxyethyl acrylate and anhydrous ethanol, stir thoroughly, add activated tourmaline nanopowder and azo initiator, stir at 70-80°C for 24-48 hours, wash and dry after the reaction to obtain modified tourmaline nanopowder, i.e., nano-composite far-infrared health functional material.

2. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In the step 1, the particle size of the tourmaline nanopowder is 100-500 nanometers.

3. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In the step 1, the mixture is first ultrasonicated at room temperature for 5-10 minutes, then placed in a water bath, and stirred at 60-80° C. for 4-10 hours.

4. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In the step 1, the mass volume ratio of tourmaline nanopowder, KH-550, deionized water and ethanol is 1g:(0.11-0.33)g:(10-20)mL:(5-15)mL.

5. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In S1 of step 2, the mass volume ratio of the aminated tourmaline nanopowder and N,N-dimethylformamide is 1 g:(10-20) mL.

6. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In S2 of step 2, the mass volume ratio of 4-methylacrylamidosalicylic acid, 1-ethyl-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide and N,N-dimethylformamide is 1g:(0.72-0.93)(0.81)g:(0.69-0.85)(0.78)g:(10-20)mL.

7. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In S3 of step 2, the volume ratio of the amination tourmaline nanopowder solution to the activation reaction solution is 1:2.1-3.

6.

8. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In the step 3, the mass volume ratio of activated tourmaline nanopowder, 2-hydroxyethyl acrylate and anhydrous ethanol is 1 g: (0.23-0.46) (0.35) g: (10-20) mL.

9. The method for preparing a nanocomposite far-infrared health-care functional material according to claim 1, characterized in that: In the step 3, the azo initiator is azobisisobutyronitrile or azobisisoheptanenitrile, and the amount added is 1.8% to 3.6% of the mass of the activated tourmaline nanopowder.

10. A nanocomposite far-infrared health-care functional material, characterized in that: The nanocomposite far-infrared health-care functional material is prepared by the preparation method described in claim 1.