High-temperature-resistant far infrared radiation material capable of generating negative ions

Abstract

The invention discloses a high-temperature-resistant far infrared radiation material capable of generating negative ions, and belongs to the technical field of preparation of far infrared radiation materials. The high-temperature-resistant far infrared radiation material capable of generating negative ions is prepared from, 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 reinforcing agent 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 reinforcing agent is prepared from cellulose nanofibers, n-dodecyltrimethoxysilane and polylactic acid. The negative ion reinforcing agent is prepared from N-hexadecyl diethanolamine, dimethyl adipate and montmorillonite. The far infrared radiation material prepared by the method has excellent high-temperature resistance, mechanical property and capability of generating 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 are known as "air vitamins" and are of great significance for improving indoor air quality and enhancing human health. At the same time, in high-temperature industrial environments, how to improve energy efficiency and reduce energy waste is also an urgent problem to be solved. Therefore, it is urgent to develop a far-infrared radiation material that is both resistant to high temperatures and can generate negative ions.

[0003] Traditional far-infrared radiation materials, such as biochar (such as high-temperature bamboo charcoal, binchotan, etc.), carbon fiber products, tourmaline and its products, far-infrared ceramics, etc., although they perform well in far-infrared radiation, they have limitations in high temperature resistance and the generation of negative ions. For example, although biochar and carbon fiber can effectively radiate far-infrared rays, their structure and performance may change under high temperature conditions, thus affecting their far-infrared radiation effects. Tourmaline requires a certain thermoelectric effect or piezoelectric effect to generate negative ions, and its high temperature resistance is limited. Although far-infrared ceramics can improve their high temperature resistance through different formulations and firing processes, their internal structure and far-infrared radiation performance will also be affected under continuous high temperature environments.

[0004] Patent CN110105918A discloses a far-infrared radiation material capable of generating negative ions and a preparation method thereof. The far-infrared radiation material is composed of 0-20 parts by weight of boron nitride, 10-70 parts of light shale, and 30-90 parts of transition metal oxides, and is prepared by mixing, grinding, calcining, and grinding. The far-infrared radiation material resonates with water molecules in the air through far-infrared radiation, causing the water molecules to split and separate, becoming "active" molecules, and the "activated" water molecules continue to fragment to form negative ions. The far-infrared radiation material can directly react with water in the air without other external conditions, and without adding tourmaline, photocatalysts, and other substances that can generate negative ions, so that negative ions can be continuously released in the space. However, the high temperature resistance and negative ion generation performance of the material prepared by this method still have room for improvement. Summary of the invention

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

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

[0007] Preferably, the method for preparing the heat-resistant agent comprises the following steps: Q1: Add cellulose nanofibers into a container containing ethanol, then drop n-dodecyltrimethoxysilane, stir for reaction, and wash 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, it is placed in a fume hood to stand and vacuum dried to obtain a heat-resistant agent.

[0008] In the above process, cellulose nanofibers are first modified by n-dodecyltrimethoxysilane to obtain a nanofiber suspension, which is then compounded with polylactic acid to prepare a heat-resistant agent.

[0009] Preferably, in 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 after washing with deionized water 2-3 times, it is washed with ethanol 1-2 times.

[0010] Preferably, in Q2, the centrifugal speed is 8000-12000 rpm, the centrifugal 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, the vacuum drying temperature is 35-38 ° C, and the time is 20-24 h.

[0011] Preferably, 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, 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, slowly add the ammonium compound after ultrasonic dispersion, stir and mix, and transfer 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.

[0012] In the above process, N-hexadecyldiethanolamine and dimethyl adipate are used as raw materials to synthesize an ammonium-containing compound, and then montmorillonite is modified by the ammonium-containing compound to obtain a negative ion enhancer.

[0013] Preferably, in S1, the molar ratio of N-hexadecyldiethanolamine to dimethyl adipate is (1.8-2.2): (0.88-1.12), the heating 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.

[0014] Preferably, in S2, the dosage ratio of montmorillonite, distilled water and ammonium-containing compound is (4-6) g: (10-15) mL: (4-9) g, the mixing 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.

[0015] Preferably, the method for preparing the high temperature resistant far-infrared radiation material capable of generating negative ions comprises the following steps: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 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.

[0017] 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 nanofiber is modified with n-dodecyltrimethoxysilane, its thermal stability can be effectively improved. After the modified cellulose nanofiber is compounded with polylactic acid, the thermal stability of the heat-resistant agent is further enhanced. The aspect ratio and high crystallinity of the cellulose nanofiber 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.

[0018] 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 on the surface of the negative ion enhancer 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, the resonance effect of the water molecules is stimulated, so that the water molecules obtain 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

[0019] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1: This example discloses a method for preparing a heat-resistant agent, comprising the following steps: 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 with deionized water three times and then with ethanol once to obtain a nanofiber suspension. Q2: After centrifuging the nanofiber suspension at 12000rpm for 10min, remove the supernatant, ultrasonically disperse 10g of the precipitate in 37.5mL of ethyl acetate, then add 24g of polylactic acid and stir until completely dissolved. Continue stirring to react for 1h. After the reaction is completed, place it in a fume hood for 12h and vacuum dry it at 38℃ for 24h to obtain a heat-resistant agent.

[0021] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps: 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, and 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, rotary evaporation was performed, ethyl acetate was added for recrystallization, suction filtration was performed, washing was performed with ethyl acetate, and vacuum drying was performed to obtain an ammonium-containing compound; S2: Add 5g of montmorillonite to 12.5mL of distilled water, and slowly add 6.5g of ammonium-containing compound after ultrasonic dispersion. After stirring for 2h, transfer to a microwave reactor with a reaction power of 700W and react at 85℃ for 1h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40℃, grind, and sieve to obtain a negative ion enhancer.

[0022] The present 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: 25 parts of boron nitride, 12.5 parts of light shale, 13.5 parts of titanium dioxide, 3.5 parts of heat resistant agent, 3.5 parts of negative ion enhancer, and 50 parts of distilled water.

[0023] This embodiment discloses a method for preparing a high temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0024] Example 2: This example discloses a method for preparing a heat-resistant agent, comprising the following steps: 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 with deionized water three times and then with ethanol once to obtain a nanofiber suspension. Q2: After centrifuging the nanofiber suspension at 12000rpm for 10min, remove the supernatant, ultrasonically disperse 8g of the precipitate in 30mL of ethyl acetate, then add 20g of polylactic acid, stir until completely dissolved, continue stirring to react for 1h, after the reaction is completed, place it in a fume hood for 12h, and vacuum dry it at 38℃ for 24h to obtain a heat-resistant agent.

[0025] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps: S1: 1.98 g N-hexadecyldiethanolamine, 0.51 g dimethyl adipate and 10 mL n-butanol were added to a container, heated to 75° C., stirred and mixed, and 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, rotary evaporation was performed, ethyl acetate was added for recrystallization, suction filtration was performed, washing was performed with ethyl acetate, and vacuum drying was performed to obtain an ammonium-containing compound; S2: Add 4g of montmorillonite to 15mL of distilled water, and slowly add 9g of ammonium-containing compound after ultrasonic dispersion. After stirring for 2h, transfer to a microwave reactor with a reaction power of 700W and react at 85℃ for 1h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40℃, grind, and sieve to obtain a negative ion enhancer.

[0026] The present 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: 20 parts of boron nitride, 10 parts of light shale, 12 parts of titanium dioxide, 5 parts of heat resistant agent, 2 parts of negative ion enhancer, and 40 parts of distilled water.

[0027] This embodiment discloses a method for preparing a high temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0028] Embodiment 3: This embodiment discloses a method for preparing a heat-resistant agent, comprising the following steps: 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 with deionized water three times and then with ethanol once to obtain a nanofiber suspension. Q2: After centrifuging the nanofiber suspension at 12000rpm for 10min, remove the supernatant, ultrasonically disperse 12g of the precipitate in 45mL of ethyl acetate, then add 28g of polylactic acid, stir until completely dissolved, continue stirring to react for 1h, after the reaction is completed, place it in a fume hood for 12h, and vacuum dry it at 38℃ for 24h to obtain a heat-resistant agent.

[0029] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps: S1: 2.42 g N-hexadecyldiethanolamine, 0.65 g dimethyl adipate and 10 mL n-butanol were added to a container, heated to 75° C., stirred and mixed, and 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, rotary evaporation was performed, ethyl acetate was added for recrystallization, suction filtration was performed, washing was performed with ethyl acetate, and vacuum drying was performed to obtain an ammonium-containing compound; S2: Add 6g of montmorillonite to 10mL of distilled water, and slowly add 4g of ammonium-containing compound after ultrasonic dispersion. After stirring for 2h, transfer to a microwave reactor with a reaction power of 700W and react at 85℃ for 1h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40℃, grind, and sieve to obtain a negative ion enhancer.

[0030] The present 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: 30 parts of boron nitride, 15 parts of light shale, 15 parts of titanium dioxide, 2 parts of heat resistant agent, 5 parts of negative ion enhancer, and 60 parts of distilled water.

[0031] This embodiment discloses a method for preparing a high temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0032] Embodiment 4: This embodiment discloses a method for preparing a heat-resistant agent, comprising the following steps: 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. Q2: After centrifuging the nanofiber suspension at 12000rpm for 10min, remove the supernatant, ultrasonically disperse 9g of the precipitate in 32mL of ethyl acetate, then add 22g of polylactic acid, stir until completely dissolved, continue stirring to react for 1h, after the reaction is completed, place it in a fume hood for 12h, and vacuum dry it at 38℃ for 24h to obtain a heat-resistant agent.

[0033] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps: 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, and 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, rotary evaporation was performed, ethyl acetate was added for recrystallization, suction filtration was performed, washing was performed with ethyl acetate, and vacuum drying was performed to obtain an ammonium-containing compound; S2: Add 4.5g of montmorillonite to 11mL of distilled water, and slowly add 5g of ammonium-containing compound after ultrasonic dispersion. After stirring for 2h, transfer to a microwave reactor with a reaction power of 700W and react at 85℃ for 1h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40℃, grind, and sieve to obtain a negative ion enhancer.

[0034] The present 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: 22 parts of boron nitride, 11 parts of light shale, 13 parts of titanium dioxide, 3 parts of heat resistant agent, 3 parts of negative ion enhancer, and 45 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: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0036] Example 5: This example discloses a method for preparing a heat-resistant agent, comprising the following steps: 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. Q2: After centrifuging the nanofiber suspension at 12000rpm for 10min, remove the supernatant, ultrasonically disperse 11g of the precipitate in 42mL of ethyl acetate, then add 26g of polylactic acid, stir until completely dissolved, continue stirring to react for 1h, after the reaction is completed, place it in a fume hood for 12h, and vacuum dry it at 38℃ for 24h to obtain a heat-resistant agent.

[0037] This embodiment discloses a method for preparing a negative ion enhancer, comprising the following steps: 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, and 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, rotary evaporation was performed, ethyl acetate was added for recrystallization, suction filtration was performed, washing was performed with ethyl acetate, and vacuum drying was performed to obtain an ammonium-containing compound; S2: Add 5.5g of montmorillonite to 14mL of distilled water, and slowly add 7g of ammonium-containing compound after ultrasonic dispersion. After stirring for 2h, transfer to a microwave reactor with a reaction power of 700W and react at 85℃ for 1h. After the reaction is completed, centrifuge, collect the precipitate, wash, freeze-dry at -40℃, grind, and sieve to obtain a negative ion enhancer.

[0038] The present 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 heat resistant agent, 4 parts of negative ion enhancer, and 55 parts of distilled water.

[0039] This embodiment discloses a method for preparing a high temperature resistant far-infrared radiation material capable of generating negative ions, comprising the following steps: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the negative ion enhancer and distilled water, press and dry to obtain a high-temperature resistant far-infrared radiation material that can generate negative ions.

[0040] Comparative Example 1: Compared with Example 1, in the process of preparing the heat-resistant agent in Comparative Example 1, no cellulose nanofibers are added, and other conditions remain unchanged.

[0041] Comparative Example 2: Compared with Example 1, in the process of preparing the negative ion enhancer in Comparative Example 2, N-hexadecyl diethanolamine is not added, and other conditions remain unchanged.

[0042] Comparative Example 3: Compared with Example 1, in Comparative Example 3, during the process of preparing the far-infrared radiation material, no heat-resistant agent is added, and other conditions remain unchanged.

[0043] Comparative Example 4: Compared with Example 1, in Comparative Example 4, during the process of preparing the far-infrared radiation material, no negative ion enhancer was added, and other conditions remained unchanged.

[0044] Experimental Example: The far-infrared radiation materials prepared in Examples 1-5 and Comparative Examples 1-4 were added to latex paint, and mixed paint was obtained after being stirred evenly. The mixed paint was applied to the wall surface, and the concentration of negative ions in the air was tested according to JC / T 2110-2012. The mixed paint was evenly applied to the surface of a clean and dry steel plate. After curing, it was placed at 90°C to observe the time when peeling, wrinkling, cracking and bubbling occurred. The test results are shown in Table 1: Table 1 It can be seen from the test results in Table 1 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. By comparing Comparative Example 1 with Examples 1-5, it can be seen that the addition of cellulose nanofibers can make the far-infrared radiation material have excellent high temperature resistance; by comparing Comparative Example 2 with Examples 1-5, it can be seen that the addition of N-hexadecyldiethanolamine can make the far-infrared radiation material have excellent ability to generate negative ions; by comparing Comparative Example 3 with Examples 1-5, it can be seen that the addition of a heat-resistant agent can make the far-infrared radiation material have excellent high temperature resistance; by comparing Comparative Example 4 with Examples 1-5, it can be seen that the addition of a negative ion enhancer can make the far-infrared radiation material have excellent ability to generate negative ions.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0046] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high temperature resistant far infrared radiation material capable of generating negative ions, characterized in that: The invention is composed of the following ingredients 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, and 40-60 parts of distilled water, wherein the heat-resistant agent is prepared from cellulose nanofiber, n-dodecyltrimethoxysilane and polylactic acid, and the negative ion enhancer is prepared from N-hexadecyldiethanolamine, dimethyl adipate and montmorillonite.

2. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 1, characterized in that: The preparation method of the heat-resistant agent comprises the following steps: Q1: Add cellulose nanofibers into a container containing ethanol, then drop n-dodecyltrimethoxysilane, stir for reaction, and wash 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, it is placed in a fume hood to stand and vacuum dried to obtain a heat-resistant agent.

3. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 2, 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 after washing with deionized water 2-3 times, it is washed with ethanol 1-2 times.

4. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 2, characterized in that: In Q2, the centrifugal speed is 8000-12000 rpm, the centrifugal 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, the vacuum drying temperature is 35-38 ° C, and the time is 20-24 h.

5. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 1, characterized in that: The preparation method of the negative ion enhancer comprises the following steps: S1: adding N-hexadecyldiethanolamine, 1,3-dibromopropane and n-butanol into a container, heating and stirring to mix, placing in a microwave reactor, 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, slowly add the ammonium compound after ultrasonic dispersion, stir and mix, and transfer 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.

6. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 5, characterized in that: In the S1, the molar ratio of N-hexadecyldiethanolamine and 1,3-dibromopropane is (1.8-2.2): (0.88-1.12), the heating 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.

7. The high temperature resistant far infrared radiation material capable of generating negative ions according to claim 5, characterized in that: In the S2, the dosage 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.

8. 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 7, characterized in that: The following steps are involved: Step 1: Put boron nitride, light shale and titanium dioxide into a mixer, mix, grind, press, sinter and cool to obtain a basic mixture; Step 2: Mix the basic mixture, the heat-resistant agent, the 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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