CN113387675B - Body type far infrared heating product and preparation method thereof - Google Patents
Body type far infrared heating product and preparation method thereof Download PDFInfo
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- CN113387675B CN113387675B CN202010172007.7A CN202010172007A CN113387675B CN 113387675 B CN113387675 B CN 113387675B CN 202010172007 A CN202010172007 A CN 202010172007A CN 113387675 B CN113387675 B CN 113387675B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
Abstract
The invention belongs to the technical field of far infrared heating, and particularly relates to a body type far infrared heating product and a preparation method thereof. The body type far infrared heating product has a three-dimensional body type structure, the whole body is made of a far infrared heating material, the far infrared heating material is composed of a mineral fiber-carbon nano tube hybrid material, and the mass ratio of mineral fibers to carbon nano tubes in the mineral fiber-carbon nano tube hybrid material is (0.2-0.3): 1; the mineral fiber is asbestos and/or rock wool fiber, and the length of the mineral fiber is 1-6 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1-15 mu m. The body type far infrared heating product has better high temperature resistance and conversion efficiency.
Description
Technical Field
The invention belongs to the technical field of far infrared heating, and particularly relates to a body type far infrared heating product and a preparation method thereof.
Background
The far infrared heating technology utilizes far infrared rays emitted by a hot object source to irradiate a heated material, so that internal molecules and atoms generate heat energy through resonance after the material absorbs the far infrared rays, and the heating purpose is achieved. The far infrared ray is also called long-wave infrared ray, and the wavelength range is from 5.6 micrometers to 1000 micrometers. The carbon nano tube has the nano-scale curvature at the tip, can present good field emission characteristics under relatively low voltage, is a good far infrared emission source, and can be mixed with other substances to prepare a heating material for various industries.
For example, chinese patent application publication No. CN108824086A discloses a carbon nanotube-aramid far-infrared paper and a method for preparing the same, in which aramid fiber and carbon nanotubes are used to prepare the carbon nanotube-aramid far-infrared paper, which can be used as a sole lining of a far-infrared physiotherapy shoe, and which not only can emit far-infrared rays, but also has physiotherapy, warming and immunity-improving functions. However, the far infrared paper has poor high temperature resistance and cannot meet the requirement of a working environment with higher temperature.
The existing far infrared heating materials are mostly surface type products such as heating films, the use scenes of the products are limited, the heating power is low, and the use requirements of high-power heating cannot be met.
Disclosure of Invention
The invention aims to provide a body type far infrared heating product with better high temperature resistance and a preparation method thereof.
In order to achieve the purpose, the technical method adopted by the invention comprises the following steps:
a body type far infrared heating product has a three-dimensional structure, the whole body is made of a far infrared heating material, the far infrared heating material is composed of a mineral fiber-carbon nano tube hybrid material, and the mass ratio of mineral fibers to carbon nano tubes in the mineral fiber-carbon nano tube hybrid material is (0.2-0.3): 1; the mineral fiber is asbestos and/or rock wool fiber, and the length of the mineral fiber is 1-6 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1-15 mu m.
The product with the three-dimensional structure has larger sectional area, and the whole body product made of the whole body has low resistivity and excellent conductive performance, thereby being capable of improving the heating power. Meanwhile, the mineral fiber used in the mineral fiber-carbon nano tube hybrid material has the characteristics of high strength, high temperature resistance, wide source and low price. The hybrid material obtained by hybridizing the mineral fiber and the carbon nano tube has good far infrared characteristic and good high temperature resistance. Therefore, the far infrared heating product made of the mineral fiber-carbon nano tube hybrid material has better high temperature resistance and higher conversion efficiency. The temperature which can be borne by the heat exchanger can reach about 680 ℃, and the heat conversion efficiency can reach more than 75%.
Preferably, the three-dimensional structure is a rod-like structure. Further preferably, the cross section of the rod-like structure is circular or square.
A preparation method of the body type far infrared heating product comprises the following steps:
(1) Dispersing mineral fibers and carbon nanotubes into a solvent to obtain mixed slurry;
(2) Sanding the mixed slurry to obtain mineral fiber-carbon nano tube hybrid slurry, and adding a dispersing agent into the mineral fiber-carbon nano tube hybrid slurry to obtain dispersed slurry;
(3) And then removing the solvent of the dispersed slurry to prepare the three-dimensional structure.
The sanding is to wind and overlap the mineral fiber and the carbon nano tube under the action of external force to form uniform and stable hybrid slurry. Preferably, the rotation speed of the sand grinding in the step (2) is 900-1100 r/min, and the time is 40-60 min. The fineness of the mineral fiber-carbon nano tube hybrid slurry obtained after sanding is below 20 mu m.
The solvent is water or ethanol, and the addition of the dispersing agent effectively improves the dispersibility of the mineral fiber and the carbon nano tube in the solvent. Preferably, the dispersant is polyvinylpyrrolidone and/or sodium dodecyl sulfate, and the dosage of the dispersant is 0.01-0.015 g of dispersant per 50mL of solvent.
Further preferably, when the solvent is water, sodium dodecyl sulfate is used as a dispersant, and the dispersant is used in the following amount: 0.012g of dispersant per 50mL of solvent. When the solvent is ethanol, polyvinylpyrrolidone is used as a dispersant, and the dispersant is used in the following amount: 0.01g of dispersant was added per 50mL of solvent.
Removing the solvent in the dispersed slurry in the step (3) by the following method: and coating the dispersed slurry on a filter cloth to remove the solvent, wherein the pore size of the filter cloth is 100-150 meshes.
The three-dimensional body structure manufactured in the step (3) specifically comprises the following steps: the slurry solid obtained after the solvent in the dispersed slurry is removed is placed in a die and then is extruded and molded under the conditions of 140-160 ℃ and 18-22 MPa. The size of the die is adjusted according to the size requirement of the body type far infrared heating product.
Detailed Description
The present invention is further illustrated by the following examples.
The asbestos and rock wool were purchased from mineral products, inc., lingshou county. The carbon nano-tube is an electrothermal conversion whisker carbon nano-tube produced by Henan Clevir nano-carbon material Co.
1. Examples of the method for producing body type far-infrared heating products
Example 1
The preparation method of the body type far infrared heating product comprises the following steps:
1) Tearing and stirring 0.42g of asbestos until the length is 1-5 mm, putting the asbestos into a stirring kettle, adding 50mL of water, adding 1.5g of whisker carbon nano tubes, and stirring to obtain mixed slurry of asbestos fibers and carbon nano tubes;
2) Adding the mixed slurry into a sand mill for sanding, wherein the rotating speed of the sand mill is controlled to be 1000 +/-10 r/min, the sanding time is 50min, so that the mixed slurry is a black-gray pasty mixture, and the fineness of the slurry is controlled to be below 20 mu m, so as to obtain a hybrid slurry with carbon nano tubes and asbestos fibers mutually adsorbed;
3) Adding 0.012g of sodium dodecyl sulfate into the hybrid slurry, fully stirring to obtain stable dispersed slurry, uniformly coating the dispersed slurry on filter cloth (with the aperture size of 100 meshes), and filtering to remove water to obtain slurry solid; and then filling the slurry solid into a rubber-coated cylinder barrel die, vibrating and compacting, pressurizing by using a piston, extruding the slurry solid at the temperature of 150 ℃ and under the pressure of 20MPa to form a rod-shaped structure, and taking out the rod-shaped structure from the die to obtain the rubber-coated cylinder barrel.
Example 2
The preparation method of the body type far infrared heating product comprises the following steps:
1) Tearing and stirring 0.32g of asbestos until the length is 1-5 mm, putting the asbestos into a stirring kettle, adding 50mL of ethanol, adding 1.5g of whisker carbon nano tubes, and stirring to obtain mixed slurry of asbestos fibers and the carbon nano tubes;
2) Adding the mixed slurry into a sand mill for sand grinding, controlling the rotation speed of the sand mill to be 1000 +/-10 r/min, controlling the sand grinding time to be 40min, enabling the mixed slurry to be a black-gray pasty mixture, controlling the fineness of the slurry to be below 20 mu m, obtaining the hybrid slurry with the carbon nano tubes and the asbestos fibers mutually adsorbed,
3) Adding 0.01g of polyvinylpyrrolidone into the hybrid slurry, fully stirring to obtain stable dispersed slurry, uniformly coating the dispersed slurry on a filter cloth (with the aperture size of 100 meshes), and filtering to remove ethanol to obtain a slurry solid; and then filling the slurry solid into a rubber-coated cylinder barrel die, vibrating and shaking the rubber-coated cylinder barrel die, pressurizing the rubber-coated cylinder barrel die by using a piston, extruding the slurry solid at the temperature of 150 ℃ and the pressure of 20MPa to form a rod-shaped structure, and taking the rod-shaped structure out of the die to obtain the rubber-coated cylinder barrel.
Example 3
The preparation method of the body type far infrared heating product comprises the following steps:
1) Tearing and stirring 0.42g of rock wool until the rock wool is 3-6 mm in length, putting the rock wool into a stirring kettle, adding 50mL of water, adding 1.5g of carbon nano tubes, and stirring to obtain mixed slurry of rock wool fibers and the carbon nano tubes;
2) Adding the mixed slurry into a sand mill for sanding, wherein the rotating speed of the sand mill is controlled to be 1000 +/-10 r/min, the sanding time is 50min, so that the mixed slurry is a black-gray pasty mixture, and the fineness of the slurry is controlled to be less than 20 mu m, so as to prepare a hybrid slurry with the carbon nano tubes and the rock wool fibers mutually adsorbed;
3) Adding 0.012g of sodium dodecyl sulfate into the hybrid slurry, fully stirring to obtain stable dispersed slurry, uniformly coating the dispersed slurry on filter cloth (with the aperture size of 150 meshes), and filtering to remove water to obtain slurry solid; and then filling the slurry solid into a rubber-coated cylinder barrel die, vibrating and shaking the rubber-coated cylinder barrel die, pressurizing the rubber-coated cylinder barrel die by using a piston, extruding the slurry solid at the temperature of 150 ℃ and the pressure of 20MPa to form a rod-shaped structure, and taking the rod-shaped structure out of the die to obtain the rubber-coated cylinder barrel.
Example 4
The preparation method of the body type far infrared heating product comprises the following steps:
1) Tearing and stirring 0.45g of rock wool until the rock wool is 3-6 mm in length, putting the rock wool into a stirring kettle, adding 50mL of ethanol, adding 1.5g of carbon nano tubes, and stirring to obtain mixed slurry of rock wool fibers and the carbon nano tubes;
2) Adding the mixed slurry into a sand mill for sanding, wherein the rotating speed of the sand mill is controlled to be 1000 +/-10 r/min, the sanding time is 60min, so that the mixed slurry is a black-gray pasty mixture, and the fineness of the slurry is controlled to be less than 20 mu m, so as to obtain the hybrid slurry with the carbon nano tubes and the rock wool fibers mutually adsorbed;
3) Adding 0.01g of polyvinylpyrrolidone into the hybrid slurry, fully stirring to obtain stable dispersed slurry, uniformly coating the dispersed slurry on filter cloth (with the pore size of 100 meshes), and filtering to remove ethanol to obtain slurry solid; and then filling the slurry solid into a rubber-coated cylinder barrel die, vibrating and shaking the rubber-coated cylinder barrel die, pressurizing the rubber-coated cylinder barrel die by using a piston, extruding the slurry solid at the temperature of 150 ℃ and the pressure of 20MPa to form a rod-shaped structure, and taking the rod-shaped structure out of the die to obtain the rubber-coated cylinder barrel.
2. Embodiments of body type far infrared heating products
Example 5
The body type far infrared heating product of the embodiment is a rod-shaped material with a circular cross section, the whole body is made of a far infrared heating material, the far infrared heating material is composed of a mineral fiber-carbon nanotube hybrid material, and the mass ratio of mineral fibers to carbon nanotubes in the mineral fiber-carbon nanotube hybrid material is 0.28; the mineral fiber is asbestos fiber with the length of 1-5 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1-15 mu m. The body type far infrared heating product of the present example can be prepared by the preparation method in example 1.
Example 6
The body type far infrared heating product of the embodiment is a rod-shaped material with a circular cross section, the whole body is made of a far infrared heating material, the far infrared heating material is composed of a mineral fiber-carbon nanotube hybrid material, and the mass ratio of mineral fibers to carbon nanotubes in the mineral fiber-carbon nanotube hybrid material is 0.21; the mineral fiber is asbestos fiber with the length of 1-5 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1-15 mu m. The body type far infrared heating product of the present example can be prepared by the preparation method in example 2.
Example 7
The body type far infrared heating product of the embodiment is a rod-shaped material with a square cross section, the whole body is made of a far infrared heating material, the far infrared heating material is composed of a mineral fiber-carbon nanotube hybrid material, and the mass ratio of mineral fibers to carbon nanotubes in the mineral fiber-carbon nanotube hybrid material is 0.28; the mineral fiber is rock wool fiber, and the length of the mineral fiber is 3-6 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1-15 mu m. The body type far infrared heating product of the present embodiment can be prepared by the preparation method in embodiment 3.
Example 8
The body type far infrared heating product of the embodiment is a rod-shaped material with a circular cross section, the whole body is made of a far infrared heating material, the far infrared heating material is composed of a mineral fiber-carbon nanotube hybrid material, and the mass ratio of mineral fibers to carbon nanotubes in the mineral fiber-carbon nanotube hybrid material is 0.3; the mineral fiber is rock wool fiber, and the length of the mineral fiber is 3-6 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1-15 mu m. The body type far infrared heating product of the present embodiment can be prepared by the preparation method in embodiment 4.
Test examples section
The body type far infrared heat emitting articles of examples 5 to 8 were subjected to a performance test.
The specific performance test method comprises the following steps:
1. maximum withstand temperature
The test was performed in a nitrogen atmosphere using a thermogravimetric analyzer. The results are shown in Table 1.
2. Ductility of steel
And (3) at normal temperature, carrying out a tensile test on the far infrared heating material, recording the length change of the material before and after the material is stretched, and testing the ductility of the material. The results are shown in Table 1.
3. Conversion efficiency
The conversion efficiency of the far infrared heating rod of the invention is measured according to the GB7287.7-87 electric-thermal radiation conversion efficiency measuring method, and the result is shown in Table 1
TABLE 1 Performance test results
| Sample(s) | Maximum withstand temperature/. Degree.C | Ductility of steel | Conversion efficiency |
| Example 5 | 650 | 105％ | 80％ |
| Example 6 | 682 | 102％ | 84％ |
| Example 7 | 637 | 108％ | 75％ |
| Example 8 | 672 | 109％ | 83％ |
The performance test result proves that the far infrared heating rod has better high temperature resistance, and can bear the temperature of more than 600 ℃; meanwhile, the far infrared heating rod has high conversion efficiency which can reach about 84% at most, and can be widely applied to the aspects of heat exchangers, honeycomb heating, health care and physical therapy and the like.
Claims (8)
1. A body type far infrared heating product is characterized in that the body type far infrared heating product has a three-dimensional body structure, the whole body is made of a far infrared heating material, the far infrared heating material is made of a mineral fiber-carbon nanotube hybrid material, and the mass ratio of mineral fibers to carbon nanotubes in the mineral fiber-carbon nanotube hybrid material is (0.2 to 0.3) to 1; the mineral fiber is asbestos and/or rock wool fiber, and the length of the mineral fiber is 1-6 mm; the carbon nano tube is a whisker carbon nano tube with the length of 1 to 15 mu m; the body type far infrared heating product is prepared by the following preparation method:
(1) Dispersing mineral fibers and carbon nanotubes into a solvent to obtain mixed slurry;
(2) Sanding the mixed slurry to obtain mineral fiber-carbon nano tube hybrid slurry, and adding a dispersing agent into the mineral fiber-carbon nano tube hybrid slurry to obtain dispersed slurry;
(3) And then, putting the slurry solid obtained after the solvent in the dispersed slurry is removed into a mold, and then carrying out extrusion molding under the conditions of 140-160 ℃ and 18-22MPa to prepare the three-dimensional structure.
2. The far infrared heating product as claimed in claim 1, wherein the three-dimensional structure is a rod-like structure.
3. The far infrared heating product of claim 2, wherein the cross section of the rod-like structure is circular or square.
4. A method for preparing the body type far infrared heating product as claimed in any one of claims 1 to 3, characterized by comprising the following steps:
(1) Dispersing mineral fibers and carbon nanotubes into a solvent to obtain mixed slurry;
(2) Sanding the mixed slurry to obtain mineral fiber-carbon nano tube hybrid slurry, and adding a dispersing agent into the mineral fiber-carbon nano tube hybrid slurry to obtain dispersed slurry;
(3) And then removing the solvent in the dispersed slurry to prepare a three-dimensional structure.
5. The method for preparing a far infrared heating product according to claim 4, wherein the rotation speed of the sand grinding in the step (2) is 900 to 1100r/min, and the time is 40 to 60min.
6. The method for preparing the body-type far infrared heating product according to claim 4, wherein the fineness of the mineral fiber-carbon nanotube hybrid slurry is below 20 μm.
7. The method for preparing a body type far infrared heating product according to claim 4, wherein the dispersing agent is polyvinylpyrrolidone and/or sodium dodecyl sulfate, and the amount of the dispersing agent is 0.01 to 0.015g per 50mL of the solvent.
8. The method for preparing a body type far infrared heating product according to claim 4, characterized in that the solvent in the dispersion slurry in the step (3) is removed by the following method: and coating the dispersion slurry on a filter cloth to remove the solvent, wherein the aperture of the filter cloth is 100 to 150 meshes.
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| CN101868070A (en) * | 2009-04-20 | 2010-10-20 | 清华大学 | Line heat source |
| FR2949792A1 (en) * | 2009-09-09 | 2011-03-11 | Arkema France | METHOD FOR MANUFACTURING THERMOPLASTIC POLYMER PRE-IMPREGNATED FIBROUS MATERIAL AND SYSTEM THEREOF |
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