CN114960217A - Preparation method of low-voltage heating film - Google Patents
Preparation method of low-voltage heating film Download PDFInfo
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- CN114960217A CN114960217A CN202210745547.9A CN202210745547A CN114960217A CN 114960217 A CN114960217 A CN 114960217A CN 202210745547 A CN202210745547 A CN 202210745547A CN 114960217 A CN114960217 A CN 114960217A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
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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
- H05B3/145—Carbon only, e.g. carbon black, graphite
-
- 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
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
- H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2201/00—Chemical constitution of the fibres, threads or yarns
- D06N2201/04—Vegetal fibres
- D06N2201/042—Cellulose fibres, e.g. cotton
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The invention relates to the field of electric heating materials, and discloses a preparation method of a low-voltage heating film, which comprises the following steps: (1) bundling and coating the carbon fiber monofilaments by using nylon fibers; (2) uniformly fixing the chinlon-coated carbon fiber bundles into the cotton fabric; (3) soaking the carbon nano tube in a sodium percarbonate aqueous solution, and stirring to obtain a pretreated carbon nano tube; (4) mixing the pretreated carbon nano tube with an aqueous polyurethane solution to prepare a prefabricated liquid; (5) and coating the prefabricated liquid on a cotton fabric fixed with carbon fibers, and heating and curing to obtain the low-voltage heating composite film. According to the invention, the nylon-coated carbon fiber bundle is fixed in the cotton fabric as the base material of the heating film, and then the waterborne polyurethane containing the pretreated carbon nano tube is coated on the surface of the base material and cured to obtain the low-voltage heating film.
Description
Technical Field
The invention relates to the field of electric heating materials, in particular to a preparation method of a low-voltage heating film.
Background
The carbon fiber is an inorganic fiber composed of carbon element, the carbon content in the fiber is more than 90%, the fiber has the soft processability of textile fiber and the inherent properties of carbon element material, has the characteristics of high strength, high modulus, high temperature resistance, fatigue resistance, corrosion resistance, creep resistance, water resistance and good electric conduction and heat conduction, and is a new generation of reinforced fiber.
The carbon fiber has excellent electrothermal effect, and can efficiently, quickly and uniformly generate heat under low voltage. The carbon fiber can generate far infrared thermal radiation beneficial to human body when heating, and has strong direct absorbability by human body, clothes and the like, and the heat loss is small in the heat transfer process. And the electrothermal conversion rate is high, the energy is saved by 30% compared with the heating element made of nickel-chromium, tungsten-molybdenum and other materials, and the electrothermal conversion film also has the advantages of high temperature resistance, oxidation resistance, long service life and the like compared with the metal wire, PIC, silicon carbide and other materials, and has good development prospect. Single carbon fiber has been widely used as a heat-generating material in carbon fiber lamps, heaters, and the like.
The electric heating film is used as a film material, has the performances of softness, light weight, heating and heat preservation and the like, and is applied to some fields. However, how to ensure the safety, convenience, mechanical strength and energy saving of the electric heating film will directly affect the practical application range of the electric heating film. If the heating film can be used under low voltage, the safety and convenience are guaranteed undoubtedly; the improvement of mechanical properties can undoubtedly further improve the service performance, and simultaneously can prolong the service life, and can be expanded to the application of a plurality of fields, including the tourism field (such as tent used outdoors in winter), the building field (such as temporary building which can not use air conditioner in winter), aerospace (such as airplane deicing), the agriculture field (such as agricultural film used for vegetable production, and the like, and has better heat preservation function due to heating), and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of a low-voltage heating film, which is characterized in that nylon-coated carbon fiber bundles are fixed in cotton fabric to serve as a base material of the heating film, and then waterborne polyurethane containing pretreated carbon nanotubes is coated on the surface of the base material and is cured to obtain the low-voltage heating film.
The specific technical scheme of the invention is as follows: a preparation method of a low-voltage heating film comprises the following preparation steps:
(1) pretreatment of carbon fibers: and bundling and coating the carbon fiber monofilaments by using nylon fibers to obtain the nylon-coated carbon fiber bundle.
In the step (1), the invention uses chinlon to carry out coating treatment after carbon fiber monofilament is gathered, and the function of the invention is as follows: on one hand, the carbon fiber is an inorganic fiber, the bonding property between the carbon fiber and the waterborne polyurethane is poor, the interface impedance is high, the electric and thermal conductivity of the material can be influenced, and the amino group contained in the polyamide fiber can be combined with the ester group of the waterborne polyurethane coated subsequently, so that good combination can be formed at the interface of the carbon fiber and the waterborne polyurethane, and the performance of the heating film can be obviously improved. On the other hand, carbon fibers have excellent strength and chemical resistance, but are inferior in toughness and are easily broken by external force. The invention utilizes the chinlon to coat the carbon fiber bundle, thereby playing the roles of buffering and protecting, preventing the increase of resistance caused by the fracture of the monofilament in the using and processing processes of the carbon fiber bundle and further improving the electric heating temperature of the carbon fiber bundle.
(2) Fixing the nylon-coated carbon fiber bundle: the nylon-coated carbon fiber bundles are uniformly fixed in the cotton fabric.
The nylon-coated carbon fiber bundles are uniformly fixed in the cotton fabric and can be used as a base material of the heating film, so that the fixing of the fiber bundles is facilitated, the processing performance is improved, the heating performance of the carbon fibers is effectively gathered, and the electric heating performance of the film is improved.
(3) The carbon nano tube is dipped in sodium percarbonate water solution and stirred, and the pretreated carbon nano tube is obtained after washing and drying.
In the previous research, the team of the invention finds that if the carbon nanotubes are directly mixed in the subsequent step (4), the dispersibility of the carbon nanotubes in the aqueous polyurethane solution is poor. Therefore, the method firstly uses sodium percarbonate to carry out strong oxidation chemical cutting pretreatment on the carbon nano tube, and can introduce a certain number of active groups on the side wall and the top end of the carbon nano tube, thereby improving the dispersibility of the carbon nano tube and further improving the mechanical property of the material. On the other hand, the carbon nano tube and the carbon fiber can form an electric conduction and heat conduction network in the film, so that the heating film can generate heat more uniformly.
(4) Mixing the pretreated carbon nano tube with the aqueous solution of the waterborne polyurethane, and performing ultrasonic dispersion treatment to prepare a prefabricated liquid.
The reason why the waterborne polyurethane is selected as the coating base material of the heating film is that compared with other matrixes, the waterborne polyurethane has better flexibility, oil resistance and chemical resistance, and particularly, the hardness of other base materials is too high, so that the waterborne polyurethane is not suitable for preparing flexible heating films.
(5) Coating the pre-prepared solution on the cotton fabric fixed with the carbon fibers obtained in the step (2), and heating and curing to obtain a low-voltage heating composite film; wherein the mass ratio of the carbon fiber monofilament, the pretreated carbon nanotube, the nylon fiber, the cotton fabric and the waterborne polyurethane is 1: 0.02-0.4: 0.3-0.8: 2-10: 20-40.
In conclusion, the heating film prepared by the preparation method provided by the invention can quickly and uniformly heat under the lower voltage of 6V-12V, has excellent mechanical property, and is more convenient and safer in the using process.
Preferably, in the step (1), the nylon-coated carbon fiber bundle comprises 3000-12000 carbon fiber monofilaments.
Preferably, in the step (1), the specification of the nylon fiber is 77.7-166.5 dtex.
Preferably, in the step (2), the area density of the cotton fabric is 60-120 g/m 2 。
Preferably, in the step (3), the concentration of the sodium percarbonate solution is 1-2 g/L; the mass ratio of the carbon nano tube to the sodium percarbonate aqueous solution is 1:180-220, the stirring temperature is 95-100 ℃, and the stirring time is 60-120 min.
Preferably, in the step (4), the concentration of the aqueous polyurethane solution is 35 to 45 wt%.
Preferably, in the step (4), the ultrasonic dispersion temperature is 30-50 ℃ and the time is 30-60 min.
Preferably, in the step (5), the curing temperature is 70-80 ℃, and the curing time is 3-4 h.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the carbon fiber monofilaments are subjected to wrapping treatment after being gathered by using the chinlon, so that the binding property at the interface of the carbon fiber bundle and the polyurethane can be improved, and the performance of the heating film is obviously improved. On the other hand, the buffer and protection functions can be achieved.
(2) The invention utilizes cotton fabric as the base material of the heating film, thereby facilitating the fixation of the fiber bundle, improving the processing performance, effectively gathering the heating performance of the carbon fiber and improving the electric heating performance of the film.
(3) The invention uses sodium percarbonate to carry out strong oxidation chemical cutting pretreatment on the carbon nano tube, and finally can improve the mechanical property of the heating film.
(4) The invention selects the waterborne polyurethane as the coating substrate of the heating film, and has good flexibility, oil resistance and chemical resistance.
(5) The heating film prepared by the method can quickly and uniformly heat under the lower voltage of 6V-12V, has excellent mechanical property, and is more convenient and safer in the using process.
Detailed Description
The present invention will be further described with reference to the following examples.
Wherein, a direct current stabilized power supply MS-605D is adopted to provide stable voltage for the heating film, and an infrared thermal imager VarioCAM hr head 620 is used to measure the change condition of the surface temperature of the composite film along with the applied voltage.
Example 1
(1) Coating 10 g of commercial (Dongli 12K) PAN carbon fiber with 8 g of 166.5dtex nylon fiber;
(2) selecting a cotton fabric with the area density of 120 g/square meter, cutting the cotton fabric into 15 x 15cm, cutting the coated carbon fiber tows into 50cm, and fixing the coated carbon fiber tows on the cotton fabric at equal intervals in a U shape to form a 10 x 10cm area.
(3) Preparing 2g/l sodium percarbonate aqueous solution A, slowly putting the carbon nano tube into a container containing the solution A and a magnetic stirring rotor according to the bath ratio of 1: 200, stirring while putting, sealing the opening of the container after putting, magnetically stirring for 60 minutes at the temperature of 100 ℃, taking out the carbon nano tube, cleaning with deionized water, and drying to obtain the pretreated carbon nano tube for later use.
(4) Diluting commercial waterborne polyurethane into a solution with a solid content of 40 wt% by using deionized water, putting 0.25 g of carbon nano tubes pretreated in the step 3 into 25 g of waterborne polyurethane solution, and performing ultrasonic wave fraction for 30min at the temperature of 30 ℃ to obtain a waterborne polyurethane mixed solution B containing the carbon nano tubes;
(5) coating the mixed solution B on a cotton fabric fixed with carbon fibers, curing for 3 hours at the temperature of 80 ℃, preparing a low-voltage heating film after curing,
(6) after the film was electrified with a voltage of 9V for 3.5 minutes, the temperature of the film reached 50 ℃ or more.
Example 2
(1) 10 grams of commercial (Dongli 12K) PAN carbon fiber was coated with 3 grams of 77.7dtex nylon fiber.
(2) Selecting a cotton fabric with the area density of 60 g/square meter, cutting the cotton fabric into 15 x 15cm, cutting the coated carbon fiber tows into 50cm, and fixing the coated carbon fiber tows on the cotton fabric at equal intervals in a U shape to form a 10 x 10cm area.
(3) Preparing 1 g/l sodium percarbonate aqueous solution A, slowly putting the carbon nano tube into a container containing the solution A and a magnetic stirring rotor according to a bath ratio of 1: 200, stirring while putting, sealing the opening of the container after putting, magnetically stirring for 120 minutes at the temperature of 100 ℃, taking out the carbon nano tube, cleaning with deionized water, and drying to obtain the pretreated carbon nano tube. (4) Diluting commercial waterborne polyurethane into a solid content of 40 wt% by using deionized water, putting 0.02 g of carbon nano tubes pretreated in the step 3 into 40 g of a waterborne polyurethane solution, and performing ultrasonic wave fraction for 30min at the temperature of 30 ℃ to obtain a waterborne polyurethane mixed solution B containing the carbon nano tubes;
(5) and coating the mixed solution B on a cotton fabric fixed with carbon fibers, curing for 3 hours at the temperature of 80 ℃, and preparing the low-voltage heating film after curing.
(6) After 5.87 minutes of energization with a voltage of 9V, the temperature of the film reached 50 ℃ or more.
Example 3
(1) 10 grams of commercial (Dongli 12K) PAN carbon fiber was coated with 5 grams of 111dtex nylon fiber.
(2) Selecting a cotton fabric with the area density of 90 g/square meter, cutting the cotton fabric into 15 x 15cm, cutting the coated carbon fiber tows into about 50cm, and fixing the coated carbon fiber tows on the cotton fabric at equal intervals in a U shape to form a 10 x 10cm area.
(3) Preparing 1 g/l sodium percarbonate aqueous solution A, slowly putting the carbon nano tubes into a container containing the solution A and a magnetic stirring rotor according to a bath ratio of 1: 200, stirring while putting, sealing the opening of the container after the putting, magnetically stirring for 120 minutes at the temperature of 100 ℃, taking out the carbon nano tubes, washing with deionized water, and drying to obtain pretreated carbon nano tubes;
(4) diluting commercial waterborne polyurethane into a solution with a solid content of 40 wt% by using deionized water, putting 0.4 g of carbon nano tubes pretreated in the step 3 into 100 g of waterborne polyurethane solution, and performing ultrasonic wave fraction for 30min at the temperature of 30 ℃ to obtain a waterborne polyurethane mixed solution B containing the carbon nano tubes;
(5) and coating the mixed solution B on a cotton fabric fixed with carbon fibers, curing for 3 hours at the temperature of 80 ℃, and preparing the low-voltage heating film after curing.
(6) After 4.6 minutes of energization with a voltage of 9V, the temperature of the film reached 50 ℃ or more.
Comparative example 1 (compared with example 1, the carbon fiber is not coated with chinlon)
(1) Selecting a cotton fabric with the area density of 120 g/square meter, cutting the cotton fabric into 15 x 15cm, cutting uncoated carbon fiber tows into 50cm, and fixing the carbon fiber tows on the cotton fabric at equal intervals in a U shape to form a 10 x 10cm area.
(2) Preparing 2g/l sodium percarbonate aqueous solution A, slowly placing the carbon nano tube into a container containing the solution A and a magnetic stirring rotor according to a bath ratio of 1: 200, stirring while placing, sealing the opening of the container after placing, magnetically stirring for 60 minutes at the temperature of 100 ℃, taking out the carbon nano tube, cleaning with deionized water, and drying to obtain the pretreated carbon nano tube for later use.
(3) Diluting commercial waterborne polyurethane into a solution with a solid content of 40 wt% by using deionized water, putting 0.25 g of carbon nano tubes pretreated in the step 3 into 25 g of waterborne polyurethane solution, and performing ultrasonic wave fraction for 30min at 80 ℃ to obtain a waterborne polyurethane mixed solution B containing the carbon nano tubes;
(4) coating the mixed solution B on cotton fabric fixed with carbon fibers, curing for 3 hours at the temperature of 80 ℃, preparing a low-voltage heating film after curing,
(5) after 5.33 minutes of energization with a voltage of 12V, the temperature of the film reached 60 ℃ or more.
Comparative example 2 (composite film without carbon nanotube filler compared to example 1)
(1) Collecting 10 g of 12K carbon fiber monofilaments by using 8 g of 166.5dtex nylon fibers and coating the rear surface of the collected monofilaments;
(2) selecting a cotton fabric with the area density of 120 g/square meter, cutting the cotton fabric into 15 x 15cm, cutting the coated carbon fiber tows into 50cm, and fixing the coated carbon fiber tows on the cotton fabric at equal intervals in a U shape to form a 10 x 10cm area.
(3) Diluting commercial waterborne polyurethane into a solution with a solid content of 40 wt% by using deionized water, and performing ultrasonic wave fraction for 30min at 80 ℃ to obtain a waterborne polyurethane mixed solution B;
(4) coating the mixed solution B on a cotton fabric fixed with carbon fibers, curing for 3 hours at the temperature of 80 ℃, preparing a low-voltage heating film after curing,
(5) after 9.67 minutes of energization with a voltage of 9V, the temperature of the film reached 50 ℃ or more.
Performance testing
And (3) testing conditions are as follows: the environmental temperature is 24 ℃, the upper limit of the testing time is 15min, and the data are as follows
The standard deviation of the membrane temperature is used for representing the uniformity degree of the membrane electrothermal temperature, and the lower value of the standard deviation represents the more uniform the membrane electrothermal temperature.
And (3) testing conditions: the environmental temperature is 24 ℃, the upper limit of the test time is 10min, and the data are as follows:
as can be seen from the comparison between the example 1 and the comparative example 1, the influence of the carbon fiber not being coated with the chinlon in advance (the comparative example 1) on the heating film is mainly reflected in the aspects of processing and heating performance, the carbon fiber is easy to be dispersed and forked at laying and particularly bending parts, the processing is inconvenient, and meanwhile, the electrothermal effect of the carbon fiber cannot be effectively concentrated, so that the phenomenon that the temperature distribution is uniform, but the overall heating capacity of the film is poorer than that of the carbon fiber being coated in advance is caused. In addition, in the comparative example 1, since the nylon is not coated in several regions, the carbon fiber is not completely covered by the polyurethane film, so that part of the surface of the carbon fiber is exposed outside the film layer (mainly concentrated at the fiber embedding part), the temperature of the regions is high, heat is concentrated but cannot be transferred to the periphery, and the overall heating benefit of the film is poor.
From example 1 and comparative example 2, it can be seen that the gain of the carbon nanotube addition on the film electrothermal effect is mainly due to the film temperature uniformity: the carbon nano tube and the carbon fiber can form an electric conduction and heat conduction network in the film, so that the heating film can generate heat more uniformly.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (8)
1. A preparation method of a low-voltage heating film is characterized by comprising the following preparation steps:
(1) pretreatment of carbon fibers: bundling and coating the carbon fiber monofilaments by using nylon fibers to obtain nylon-coated carbon fiber bundles;
(2) fixing the nylon-coated carbon fiber bundle: uniformly fixing the chinlon-coated carbon fiber bundles into the cotton fabric;
(3) soaking the carbon nano tube in a sodium percarbonate aqueous solution, stirring, washing and drying to obtain a pretreated carbon nano tube;
(4) mixing the pretreated carbon nano tube with an aqueous polyurethane solution, and preparing a prefabricated liquid after ultrasonic dispersion treatment;
(5) coating the pre-prepared solution on the cotton fabric fixed with the carbon fibers obtained in the step (2), and heating and curing to obtain a low-voltage heating composite film; the mass ratio of the carbon fiber monofilament to the pretreated carbon nanotube to the nylon fiber to the cotton fabric to the waterborne polyurethane is 1: (0.02-0.4): (0.3-0.8): (2-10): (20-40).
2. The method of claim 1, wherein: in the step (1), the nylon-coated carbon fiber bundle comprises 3000-12000 carbon fiber monofilaments.
3. The method of claim 1 or 2, wherein: in the step (1), the specification of the nylon fiber is 77.7-166.5 dtex.
4. The method of claim 1, wherein: in the step (2), the area density of the cotton fabric is 60-120 g/m 2 。
5. The method of claim 1, wherein: in the step (3), the concentration of the sodium percarbonate solution is 1-2 g/L; the mass ratio of the carbon nano tube to the sodium percarbonate aqueous solution is 1:180-220, the stirring temperature is 95-100 ℃, and the stirring time is 60-120 min.
6. The method of claim 1, wherein: in the step (4), the concentration of the aqueous polyurethane solution is 35-45 wt%.
7. The method of claim 1 or 6, wherein: in the step (4), the ultrasonic dispersion temperature is 30-50 ℃, and the time is 30-60 min.
8. The method of claim 1, wherein: in the step (5), the curing temperature is 70-80 ℃, and the curing time is 3-4 h.
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| CN111196893A (en) * | 2018-11-19 | 2020-05-26 | 中国科学院宁波材料技术与工程研究所 | Functional composite wire based on carbon fiber reinforced nylon and electric heating driving element made of functional composite wire |
| CN110079074A (en) * | 2019-05-15 | 2019-08-02 | 武汉鑫碳科技有限公司 | A kind of fibre reinforced polyurethane composite material and preparation method |
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