High temperature resistant far infrared radiation material that can generate negative ions

Abstract

The present invention discloses a high temperature resistant far-infrared radiation material capable of generating negative ions, and belongs to the technical field of far-infrared radiation material preparation. The high temperature resistant far-infrared radiation material capable of generating negative ions is composed of the following components in parts by weight: 20-30 parts of boron nitride, 10-15 parts of light shale, 12-15 parts of titanium dioxide, 2-5 parts of heat-resistant agent, 2-5 parts of negative ion enhancer, 40-60 parts of distilled water, wherein the heat-resistant agent is prepared by cellulose nanofiber, n-dodecyltrimethoxysilane and polylactic acid, and the negative ion enhancer is prepared by N-hexadecyldiethanolamine, dimethyl adipate and montmorillonite. The far-infrared radiation material prepared by this method has excellent high temperature resistance, mechanical properties and the ability to generate negative ions.

Description

Technical Field

[0001] The invention belongs to the technical field of far-infrared radiation material preparation, and in particular relates to a high-temperature resistant far-infrared radiation material capable of generating negative ions. Background Art

[0002] Negative ions, known as "vitamins of the air," are crucial for improving indoor air quality and enhancing human health. At the same time, improving energy efficiency and reducing energy waste in high-temperature industrial environments are pressing challenges. Therefore, there is an urgent need to develop a far-infrared radiant material that is both heat-resistant and capable of generating negative ions.

[0003] Traditional far-infrared radiating materials, such as biochar (e.g., high-temperature bamboo charcoal, binchotan charcoal), carbon fiber products, tourmaline and its products, and far-infrared ceramics, while performing well in far-infrared radiation, have limitations in terms of high-temperature resistance and negative ion production. For example, while biochar and carbon fiber effectively radiate far-infrared rays, their structure and properties may change under high-temperature conditions, affecting their far-infrared radiation effectiveness. Tourmaline requires a certain degree of thermoelectric or piezoelectric effect to generate negative ions, and its high-temperature resistance is limited. While far-infrared ceramics can improve their high-temperature resistance through different formulations and firing processes, their internal structure and far-infrared radiation performance are also affected by sustained high-temperature conditions.

[0004] Patent CN110105918A discloses a far-infrared radiating material capable of generating negative ions and its preparation method. The far-infrared radiating material is composed of 0-20 parts by weight of boron nitride, 10-70 parts of light shale, and 30-90 parts of a transition metal oxide. The material is prepared through mixing, grinding, calcining, and re-grinding. The far-infrared radiating material resonates with water molecules in the air through far-infrared radiation, causing the water molecules to break apart and separate, becoming "active" molecules. The "activated" water molecules continue to break apart, forming negative ions. The far-infrared radiating material can directly interact with water in the air, without the need for other external forces or the addition of negative ion-generating substances such as tourmaline or photocatalysts, to continuously release negative ions within a space. However, the high-temperature resistance and negative ion-generating performance of the material prepared by this method still need to be improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature resistant far-infrared radiation material that can generate negative ions, so as to solve the technical problems of the prior art far-infrared radiation materials having poor high-temperature resistance and negative ion generation performance.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The invention provides a high-temperature resistant far-infrared radiation material capable of generating negative ions. The material is composed of the following components in parts by weight: 20-30 parts of boron nitride, 10-15 parts of light shale, 12-15 parts of titanium dioxide, 2-5 parts of a heat-resistant agent, 2-5 parts of a negative ion enhancer, and 40-60 parts of distilled water. The heat-resistant agent is prepared from cellulose nanofibers, n-dodecyltrimethoxysilane, and polylactic acid, and the negative ion enhancer is prepared from N-hexadecyldiethanolamine, dimethyl adipate, and montmorillonite.

[0008] Preferably, the method for preparing the heat-resistant agent comprises the following steps:

[0009] Q1: Cellulose nanofibers were added to a container containing ethanol, and then n-dodecyltrimethoxysilane was added dropwise. After stirring for reaction, the mixture was washed to obtain a nanofiber suspension.

[0010] Q2: After the nanofiber suspension is centrifuged, the supernatant is removed, and the precipitate is ultrasonically dispersed in ethyl acetate. Then, polylactic acid is added and stirred until completely dissolved. The stirring reaction is continued. After the reaction is completed, it is placed in a fume hood and allowed to stand, and vacuum dried to obtain a heat-resistant agent.

[0011] In the above process, cellulose nanofibers are first modified with n-dodecyltrimethoxysilane to obtain a nanofiber suspension, which is then compounded with polylactic acid to prepare a heat-resistant agent.

[0012] Preferably, in Q1, the ratio of cellulose nanofibers, ethanol and n-dodecyltrimethoxysilane is (20-30) g: (200-300) mL: (1-1.2) mL, the stirring reaction time is 1-4 h, and the mixture is washed with deionized water 2-3 times and then washed with ethanol 1-2 times.

[0013] Preferably, in Q2, the centrifugal speed is 8000-12000 rpm, the centrifugation time is 10-15 min, the amount ratio of precipitate, ethyl acetate and polylactic acid is (8-12) g: (30-45) mL: (20-28) g, the stirring reaction time is continued for 1-2 h, the standing time is 10-12 h, and the vacuum drying temperature is 35-38 ° C, and the time is 20-24 h.

[0014] Preferably, the preparation method of the negative ion enhancer comprises the following steps:

[0015] S1: adding N-hexadecyldiethanolamine, dimethyl adipate and n-butanol into a container, heating and stirring to mix, placing in a microwave reactor, and after the reaction is completed, rotary evaporation, recrystallization, suction filtration, washing, and vacuum drying to obtain an ammonium-containing compound;

[0016] S2: Add montmorillonite to distilled water, disperse it ultrasonically, slowly add the ammonium compound, stir and mix, and transfer it to a microwave reactor. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry, grind, and sieve to obtain a negative ion enhancer.

[0017] In the above process, N-hexadecyldiethanolamine and dimethyl adipate are used as raw materials to synthesize an ammonium-containing compound, and then the ammonium-containing compound is used to modify montmorillonite to obtain a negative ion enhancer.

[0018] Preferably, in S1, the molar ratio of N-hexadecyldiethanolamine and dimethyl adipate is (1.8-2.2): (0.88-1.12), the heating and stirring mixing time is 70-82°C, the microwave power of the microwave reactor is 600-700W, the reaction temperature is 110-120°C, the reaction time is 4-6h, ethyl acetate is added for recrystallization, and washed with ethyl acetate.

[0019] Preferably, in S2, the usage ratio of montmorillonite, distilled water and ammonium-containing compound is (4-6) g: (10-15) mL: (4-9) g, the mixing and stirring time is 1-2 h, the reaction power of the microwave reactor is 700-900 W, the reaction temperature is 80-90° C., the reaction time is 1-2 h, and the freeze-drying temperature is -30~-50° C.

[0020] Preferably, the method for preparing the high temperature resistant far-infrared radiation material capable of generating negative ions comprises the following steps:

[0021] Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture;

[0022] Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The present invention first uses cellulose nanofibers, n-dodecyltrimethoxysilane and polylactic acid as raw materials to prepare a heat-resistant agent, and then uses N-hexadecyldiethanolamine, dimethyl adipate and montmorillonite as raw materials to prepare a negative ion enhancer. The heat-resistant agent and the negative ion enhancer are added to the far-infrared radiation material to effectively improve its heat resistance, mechanical properties and ability to release negative ions.

[0025] 2. The present invention adds the prepared heat-resistant agent to the far-infrared radiation material, which can effectively improve the heat resistance and mechanical properties of the material. After the cellulose nanofibers are modified with n-dodecyltrimethoxysilane, their thermal stability can be effectively improved. After the modified cellulose nanofibers are compounded with polylactic acid, the thermal stability of the heat-resistant agent is further enhanced. The aspect ratio and high crystallinity of the cellulose nanofibers give the heat-resistant agent good barrier properties. Adding it to the far-infrared radiation material can form a denser network structure, effectively blocking heat transfer and improving the high temperature resistance of the material; the nanofibers can be evenly dispersed in the far-infrared radiation material to form an effective stress transfer path. When the material is subjected to external force, the presence of the heat-resistant agent can bear part of the stress and reduce the burden on the material. The presence of the network structure can also improve the mechanical properties of the material.

[0026] 3. The present invention adds the prepared negative ion enhancer to the far-infrared radiation material, which can effectively improve the material's ability to release negative ions. The hydroxyl groups contained on the surface of the negative ion enhancer will interact with water molecules in the air to form hydrogen bonds, thereby building a thin water film on the surface of the material, which is not only conducive to the generation of negative ions, but also when the original infrared rays emitted by the far-infrared material that match the radiation of the human body are irradiated to the surface of the water film, it will stimulate the resonance effect of the water molecules, allowing the water molecules to gain energy and decompose to produce negative ions and positive ions. At the same time, the modified montmorillonite absorbs positive ions and harmful substances in the air with its enhanced adsorption capacity, while the negative charge on its surface repels negative ions, making it easier for negative ions to be released into the air. The synergistic effect of adsorption and repulsion can improve the material's ability to release negative ions. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1: This example discloses a method for preparing a heat-resistant agent, comprising the following steps:

[0029] Q1: 25 g of cellulose nanofibers were added to a container containing 250 mL of ethanol, and then 1.1 mL of n-dodecyltrimethoxysilane was added dropwise. After stirring for 2 h, the mixture was washed three times with deionized water and once with ethanol to obtain a nanofiber suspension.

[0030] Q2: After the nanofiber suspension was centrifuged at 12000 rpm for 10 min, the supernatant was removed and 10 g of the precipitate was ultrasonically dispersed in 37.5 mL of ethyl acetate. Then 24 g of polylactic acid was added and stirred until completely dissolved. The stirring reaction was continued for 1 h. After the reaction was completed, it was placed in a fume hood and allowed to stand for 12 h. It was then vacuum dried at 38 ° C for 24 h to obtain a heat-resistant agent.

[0031] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps:

[0032] S1: 2.2 g of N-hexadecyldiethanolamine, 0.58 g of dimethyl adipate, and 10 mL of n-butanol were added to a container, heated to 75°C, stirred, and mixed. The mixture was then placed in a microwave reactor with a microwave power of 600 W and reacted at 110°C for 4 h. After the reaction was completed, the mixture was rotary evaporated, and ethyl acetate was added for recrystallization. The mixture was filtered, washed with ethyl acetate, and dried in vacuo to obtain an ammonium-containing compound.

[0033] S2: Add 5 g of montmorillonite to 12.5 mL of distilled water, and after ultrasonic dispersion, slowly add 6.5 g of ammonium-containing compound. After stirring for 2 h, transfer to a microwave reactor with a reaction power of 700 W and a reaction temperature of 85°C for 1 h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40°C, grind, and sieve to obtain a negative ion enhancer.

[0034] This embodiment discloses a high-temperature resistant far-infrared radiation material capable of generating negative ions, which is composed of the following ingredients in parts by weight: 25 parts of boron nitride, 12.5 parts of light shale, 13.5 parts of titanium dioxide, 3.5 parts of a heat-resistant agent, 3.5 parts of a negative ion enhancer, and 50 parts of distilled water.

[0035] This embodiment discloses a method for preparing a high-temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps:

[0036] Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture;

[0037] Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0038] Example 2: This example discloses a method for preparing a heat-resistant agent, comprising the following steps:

[0039] Q1: 20 g of cellulose nanofibers were added to a container containing 200 mL of ethanol, and then 1.2 mL of n-dodecyltrimethoxysilane was added dropwise. After stirring for 2 h, the mixture was washed three times with deionized water and once with ethanol to obtain a nanofiber suspension.

[0040] Q2: After the nanofiber suspension was centrifuged at 12000 rpm for 10 min, the supernatant was removed and 8 g of the precipitate was ultrasonically dispersed in 30 mL of ethyl acetate. Then 20 g of polylactic acid was added and stirred until completely dissolved. The stirring reaction was continued for 1 h. After the reaction was completed, it was placed in a fume hood and allowed to stand for 12 h. It was then vacuum dried at 38 ° C for 24 h to obtain a heat-resistant agent.

[0041] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps:

[0042] S1: 1.98 g of N-hexadecyldiethanolamine, 0.51 g of dimethyl adipate, and 10 mL of n-butanol were added to a container, heated to 75°C, stirred, and mixed. The mixture was then placed in a microwave reactor with a microwave power of 600 W and reacted at 110°C for 4 h. After the reaction was completed, the mixture was rotary evaporated, and ethyl acetate was added for recrystallization. The mixture was filtered, washed with ethyl acetate, and dried in vacuo to obtain an ammonium-containing compound.

[0043] S2: Add 4 g of montmorillonite to 15 mL of distilled water, and after ultrasonic dispersion, slowly add 9 g of ammonium-containing compound. After stirring for 2 h, transfer to a microwave reactor, react at 85°C for 1 h at a reaction power of 700 W. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40°C, grind, and sieve to obtain a negative ion enhancer.

[0044] This embodiment discloses a high-temperature resistant far-infrared radiation material capable of generating negative ions, which is composed of the following ingredients in parts by weight: 20 parts of boron nitride, 10 parts of light shale, 12 parts of titanium dioxide, 5 parts of a heat-resistant agent, 2 parts of a negative ion enhancer, and 40 parts of distilled water.

[0045] This embodiment discloses a method for preparing a high-temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps:

[0046] Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture;

[0047] Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0048] Example 3: This example discloses a method for preparing a heat-resistant agent, comprising the following steps:

[0049] Q1: 30 g of cellulose nanofibers were added to a container containing 300 mL of ethanol, and then 1.2 mL of n-dodecyltrimethoxysilane was added dropwise. After stirring for 2 h, the mixture was washed three times with deionized water and once with ethanol to obtain a nanofiber suspension.

[0050] Q2: After the nanofiber suspension was centrifuged at 12000 rpm for 10 min, the supernatant was removed and 12 g of the precipitate was ultrasonically dispersed in 45 mL of ethyl acetate. Then 28 g of polylactic acid was added and stirred until completely dissolved. The stirring reaction was continued for 1 h. After the reaction was completed, it was placed in a fume hood and allowed to stand for 12 h. It was then vacuum dried at 38 ° C for 24 h to obtain a heat-resistant agent.

[0051] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps:

[0052] S1: 2.42 g of N-hexadecyldiethanolamine, 0.65 g of dimethyl adipate, and 10 mL of n-butanol were added to a container, heated to 75°C, stirred, and mixed. The mixture was then placed in a microwave reactor with a microwave power of 600 W and reacted at 110°C for 4 h. After the reaction was completed, the mixture was rotary evaporated, and ethyl acetate was added for recrystallization. The mixture was filtered, washed with ethyl acetate, and dried in vacuo to obtain an ammonium-containing compound.

[0053] S2: Add 6 g of montmorillonite to 10 mL of distilled water, and after ultrasonic dispersion, slowly add 4 g of ammonium-containing compound. After stirring for 2 h, transfer to a microwave reactor with a reaction power of 700 W and a reaction temperature of 85°C for 1 h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40°C, grind, and sieve to obtain a negative ion enhancer.

[0054] This embodiment discloses a high-temperature resistant far-infrared radiation material capable of generating negative ions, which is composed of the following ingredients in parts by weight: 30 parts of boron nitride, 15 parts of light shale, 15 parts of titanium dioxide, 2 parts of a heat-resistant agent, 5 parts of a negative ion enhancer, and 60 parts of distilled water.

[0055] This embodiment discloses a method for preparing a high-temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps:

[0056] Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture;

[0057] Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0058] Example 4: This example discloses a method for preparing a heat-resistant agent, comprising the following steps:

[0059] Q1: 22 g of cellulose nanofibers were added to a container containing 210 mL of ethanol, and then 1 mL of n-dodecyltrimethoxysilane was added dropwise. After stirring for 2 h, the mixture was washed three times with deionized water and once with ethanol to obtain a nanofiber suspension.

[0060] Q2: After the nanofiber suspension was centrifuged at 12000 rpm for 10 min, the supernatant was removed and 9 g of the precipitate was ultrasonically dispersed in 32 mL of ethyl acetate. Then 22 g of polylactic acid was added and stirred until completely dissolved. The stirring reaction was continued for 1 h. After the reaction was completed, it was placed in a fume hood and allowed to stand for 12 h. It was then vacuum dried at 38 ° C for 24 h to obtain a heat-resistant agent.

[0061] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps:

[0062] S1: 2.07 g of N-hexadecyldiethanolamine, 0.54 g of dimethyl adipate, and 10 mL of n-butanol were added to a container, heated to 75°C, stirred, and mixed. The mixture was then placed in a microwave reactor with a microwave power of 600 W and reacted at 110°C for 4 h. After the reaction was completed, the mixture was rotary evaporated, and ethyl acetate was added for recrystallization. The mixture was filtered, washed with ethyl acetate, and dried in vacuo to obtain an ammonium-containing compound.

[0063] S2: Add 4.5 g of montmorillonite to 11 mL of distilled water, and after ultrasonic dispersion, slowly add 5 g of ammonium-containing compound. After stirring for 2 h, transfer to a microwave reactor with a reaction power of 700 W and a reaction temperature of 85°C for 1 h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40°C, grind, and sieve to obtain a negative ion enhancer.

[0064] This embodiment discloses a high-temperature resistant far-infrared radiation material capable of generating negative ions, which is composed of the following ingredients in parts by weight: 22 parts of boron nitride, 11 parts of light shale, 13 parts of titanium dioxide, 3 parts of a heat-resistant agent, 3 parts of a negative ion enhancer, and 45 parts of distilled water.

[0065] This embodiment discloses a method for preparing a high-temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps:

[0066] Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture;

[0067] Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0068] Example 5: This example discloses a method for preparing a heat-resistant agent, comprising the following steps:

[0069] Q1: 28 g of cellulose nanofibers were added to a container containing 280 mL of ethanol, and then 1.15 mL of n-dodecyltrimethoxysilane was added dropwise. After stirring for 2 h, the mixture was washed three times with deionized water and once with ethanol to obtain a nanofiber suspension.

[0070] Q2: After the nanofiber suspension was centrifuged at 12000 rpm for 10 min, the supernatant was removed and 11 g of the precipitate was ultrasonically dispersed in 42 mL of ethyl acetate. Then 26 g of polylactic acid was added and stirred until completely dissolved. The stirring reaction was continued for 1 h. After the reaction was completed, it was placed in a fume hood and allowed to stand for 12 h. It was then vacuum dried at 38 °C for 24 h to obtain a heat-resistant agent.

[0071] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps:

[0072] S1: 2.31 g of N-hexadecyldiethanolamine, 0.61 g of dimethyl adipate, and 10 mL of n-butanol were added to a container, heated to 75°C, stirred, and mixed. The mixture was then placed in a microwave reactor with a microwave power of 600 W and reacted at 110°C for 4 h. After the reaction was completed, the mixture was rotary evaporated, and ethyl acetate was added for recrystallization. The mixture was filtered, washed with ethyl acetate, and dried in vacuo to obtain an ammonium-containing compound.

[0073] S2: Add 5.5 g of montmorillonite to 14 mL of distilled water, and slowly add 7 g of ammonium-containing compound after ultrasonic dispersion. After stirring for 2 h, transfer to a microwave reactor with a reaction power of 700 W and a reaction temperature of 85°C for 1 h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40°C, grind, and sieve to obtain a negative ion enhancer.

[0074] This embodiment discloses a high-temperature resistant far-infrared radiation material capable of generating negative ions, which is composed of the following components in parts by weight: 28 parts of boron nitride, 14 parts of light shale, 14 parts of titanium dioxide, 4 parts of a heat-resistant agent, 4 parts of a negative ion enhancer, and 55 parts of distilled water.

[0075] This embodiment discloses a method for preparing a high-temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps:

[0076] Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture;

[0077] Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0078] Comparative Example 1: Compared with Example 1, in Comparative Example 1, no cellulose nanofibers were added during the preparation of the heat-resistant agent, and other conditions remained unchanged.

[0079] Comparative Example 2: Compared with Example 1, in Comparative Example 2, during the preparation of the negative ion enhancer, no N-hexadecyldiethanolamine was added, and other conditions remained unchanged.

[0080] Comparative Example 3: Compared with Example 1, in Comparative Example 3, no heat-resistant agent is added during the preparation of the far-infrared radiation material, and other conditions remain unchanged.

[0081] Comparative Example 4: Compared with Example 1, in Comparative Example 4, no negative ion enhancer is added during the preparation of the far-infrared radiation material, and other conditions remain unchanged.

[0082] Experimental Example: The far-infrared radiation materials prepared in Examples 1-5 and Comparative Examples 1-4 were added to latex paint and stirred evenly to obtain a mixed paint. The mixed paint was applied to a wall surface. The concentration of negative ions in the air was tested according to JC / T 2110-2012. The mixed paint was evenly applied to a clean and dry steel plate surface. After curing, the mixed paint was placed at 90°C and the time for peeling, wrinkling, cracking, and bubbling to appear was observed. The test results are shown in Table 1:

[0083] Table 1

[0084]

[0085] The test results in Table 1 show that the far-infrared radiation materials prepared in Examples 1-5 of the present invention have excellent high-temperature resistance and the ability to generate negative ions. A comparison between Comparative Example 1 and Examples 1-5 shows that the addition of cellulose nanofibers can impart excellent high-temperature resistance to the far-infrared radiation material; a comparison between Comparative Example 2 and Examples 1-5 shows that the addition of N-hexadecyldiethanolamine can impart excellent negative ion generation to the far-infrared radiation material; a comparison between Comparative Example 3 and Examples 1-5 shows that the addition of a heat-resistant agent can impart excellent high-temperature resistance to the far-infrared radiation material; and a comparison between Comparative Example 4 and Examples 1-5 shows that the addition of a negative ion enhancer can impart excellent negative ion generation to the far-infrared radiation material.

[0086] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0087] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. High temperature resistant far infrared radiation material capable of generating negative ions, characterized in that: The invention comprises the following components in parts by weight: 20-30 parts of boron nitride, 10-15 parts of light shale, 12-15 parts of titanium dioxide, 2-5 parts of a heat-resistant agent, 2-5 parts of a negative ion enhancer, and 40-60 parts of distilled water, wherein the heat-resistant agent is prepared from cellulose nanofibers, n-dodecyltrimethoxysilane, and polylactic acid, and the negative ion enhancer is prepared from N-hexadecyldiethanolamine, dimethyl adipate, and montmorillonite. The preparation method of the heat-resistant agent comprises the following steps: Q1: Cellulose nanofibers were added to a container containing ethanol, and then n-dodecyltrimethoxysilane was added dropwise. After stirring for reaction, the mixture was washed to obtain a nanofiber suspension. Q2: After the nanofiber suspension is centrifuged, the supernatant is removed, and the precipitate is ultrasonically dispersed in ethyl acetate, and then polylactic acid is added and stirred until completely dissolved. The stirring reaction is continued. After the reaction is completed, the mixture is placed in a fume hood and allowed to stand, and vacuum dried to obtain a heat-resistant agent. The preparation method of the negative ion enhancer comprises the following steps: S1: adding N-hexadecyldiethanolamine, dimethyl adipate and n-butanol into a container, heating and stirring to mix, placing in a microwave reactor, and after the reaction is completed, rotary evaporation, recrystallization, suction filtration, washing, and vacuum drying to obtain an ammonium-containing compound; S2: Add montmorillonite to distilled water, disperse it ultrasonically, slowly add the ammonium compound, stir and mix, and transfer it to a microwave reactor. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry, grind, and sieve to obtain a negative ion enhancer.

2. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 1, characterized in that: In the Q1, the amount ratio of cellulose nanofibers, ethanol and n-dodecyltrimethoxysilane is (20-30) g: (200-300) mL: (1-1.2) mL, the stirring reaction time is 1-4 h, and the product is washed with deionized water 2-3 times and then washed with ethanol 1-2 times.

3. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 1, characterized in that: In Q2, the centrifugal speed is 8000-12000 rpm, the centrifugation time is 10-15 min, the amount ratio of precipitate, ethyl acetate and polylactic acid is (8-12) g: (30-45) mL: (20-28) g, the stirring reaction time is continued for 1-2 h, the standing time is 10-12 h, and the vacuum drying temperature is 35-38 ° C, and the time is 20-24 h.

4. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 1, characterized in that: In S1, the molar ratio of N-hexadecyldiethanolamine to dimethyl adipate is (1.8-2.2): (0.88-1.12), the heating and stirring mixing time is 70-82°C, the microwave power of the microwave reactor is 600-700W, the reaction temperature is 110-120°C, the reaction time is 4-6h, ethyl acetate is added for recrystallization, and the mixture is washed with ethyl acetate.

5. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 1, characterized in that: In S2, the usage ratio of montmorillonite, distilled water, and ammonium-containing compound is (4-6) g: (10-15) mL: (4-9) g, the mixing and stirring time is 1-2 h, the reaction power of the microwave reactor is 700-900 W, the reaction temperature is 80-90° C., the reaction time is 1-2 h, and the freeze-drying temperature is -30 to -50° C.

6. The method for preparing the high temperature resistant far infrared radiation material capable of generating negative ions according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind and refine, press into shape, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, heat-resistant agent, negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

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