A method for preparing and applying a photoelectric thermal film twisted composite yarn and its fabric.

Abstract

This invention discloses a method for preparing and applying a photoelectric and thermal film-twisted composite yarn and its fabric, belonging to the field of photoelectric and thermal fabric technology. The method for preparing the photoelectric and thermal film-twisted composite yarn uses a Tencel film with excellent processing performance as a carrier. Carbon nanotubes are uniformly embedded and bonded to the Tencel film, and then further cut into strips and twisted with electrical wires on a spinning machine to form the composite yarn. This invention uses a film-twisting process after loading carbon nanotubes onto the Tencel film. Its spiral structure provides sufficient water absorption pores and excellent water circulation channels for seawater evaporation, achieving strong self-cleaning ability and high-efficiency water supply evaporation capacity after salt evaporation, and further enhancing yarn strength. Furthermore, this invention uses both photothermal and electrothermal methods to maintain continuous and efficient fabric heating, achieving excellent overall evaporation performance under conditions of insufficient sunlight during the day, no sunlight at night, and day-night alternation, maintaining a stable and excellent evaporation effect.

Description

Technical Field

[0001] This invention belongs to the field of optoelectronic thermal fabric technology, specifically relating to a method for preparing and applying an optoelectronic thermal film twisted composite yarn and its fabric. Background Technology

[0002] Seawater desalination, as a major solution to freshwater scarcity and an important water resource management strategy, helps address global water shortages, balance the global water cycle, protect the environment, and assist island nations in meeting survival challenges. With continuous technological advancements and cost reductions, seawater desalination will play an increasingly important role in future water resource management. To solve the freshwater shortage problem, solar energy, a renewable resource, is utilized. Its light-driven interfacial water evaporation system heats the surface of the water to be treated using the interfacial evaporation principle, promoting vapor evaporation and obtaining water that meets human needs through condensation.

[0003] A light-driven interfacial water evaporation system typically consists of an absorber, a float, and a collection device. To achieve efficient light-to-vapor conversion, the following requirements must be met: the absorber must have excellent photothermal conversion performance and must not be in direct contact with water; the float must be able to transport water to the evaporation interface, so that the evaporation rate at the interface is balanced with the amount of water transported to the absorber, and it must have excellent thermal management capabilities; the collection device must be lightweight and have high light transmittance.

[0004] In Chinese patent CN115976851A, the inventors used a carbon-based nanoparticle / polymer mixture coated onto a hydrophilic fabric, and then formed a carbon-based polymer porous membrane using a water droplet template method. The pore size of the composite photothermal fabric surface provides an escape channel for water vapor generated during photo-vapor conversion, increasing the photo-vapor conversion efficiency and facilitating subsequent water vapor condensation and recovery. The water droplet template method allows for effective control of the surface pore size and hydrophilic / hydrophobic properties of the composite photothermal fabric by changing materials and process parameters, offering high design flexibility. The method is simple to prepare, uses low-cost materials, and has high practicality. In Chinese patent CN108221133A, the inventors used a three-dimensional filled electrothermal evaporation fabric, designing a composite electrothermal evaporation layer, a floating insulation layer, and a water-absorbing layer, all bound together by binding yarns. The fabric contains internal floating embedding materials, allowing it to float on water. The materials used in the electrothermal evaporation layer include, for example, carbon fiber, graphene fiber, metal-coated fiber, or nano-conductive particle coated fiber, or any combination thereof. The fibers possess light-absorbing or conductive heat-generating properties, enabling the fabric to easily achieve photothermal-electrothermal evaporation effects. This three-dimensional filling structure features high strength, rapid evaporation, a short process flow, and suitability for industrial production.

[0005] The aforementioned inventions still have a few problems: In patent CN115976851A, the porous thin film structure formed by the water droplet template method cannot maintain its transmission performance for long. Specifically, the microporous structure is easily blocked by the crystallization of evaporated salt, and overall, the self-cleaning ability of the fabric is insufficient to ensure the continuity of evaporation performance. In addition, the thin film structure is easily affected by strong external forces, and the overall fabric strength is insufficient. In patent CN108221133A, the heating material used in the electrothermal evaporation layer consists of both electrothermal and photothermal components. When only electrothermal material is used as the evaporation layer, the economic efficiency is low, the risk factor is high, and the overall heating effect is poor; when only photothermal material is used as the evaporation layer, it cannot meet the all-weather evaporation effect. Moreover, when the daytime light intensity is insufficient to achieve the desired evaporation effect, the daily evaporation volume is poor. It is greatly affected by the duration and intensity of light, and cannot meet current expectations for evaporation performance. Summary of the Invention

[0006] Based on the above reasons, and in view of the problems or defects existing in the prior art, the purpose of this invention is to provide a method for preparing and applying photoelectric thermal film twisted composite yarn and its fabric, so as to solve or at least partially solve the above-mentioned technical defects existing in the prior art: The purpose of this invention is to solve the problem that existing photothermal evaporators cannot carry out efficient and long-lasting all-weather seawater evaporation, and to achieve high-performance interface evaporation effect by photoelectric thermal means.

[0007] To achieve one of the above-mentioned objectives of the present invention, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing a photoelectric and thermal film twisted composite yarn involves using a Tencel film with excellent processing performance as a carrier, uniformly embedding and bonding carbon nanotubes onto the Tencel film, further cutting them into strips, and twisting them with electrical wires on a spinning machine to form the composite yarn.

[0009] Furthermore, the above-mentioned technical solution, specifically the method for preparing the photoelectric thermal film twisted composite yarn, includes the following steps:

[0010] S1: Pretreatment of photoelectric thermal thin film;

[0011] S2: Preparation of photoelectric thermal thin film composite carbon nanotubes;

[0012] S3: Preparation of photoelectric thermal film twisted composite yarn.

[0013] Furthermore, in the above technical solution, the pretreatment method of the photoelectric thermal film in step S1 is as follows: the Tencel film is heated in anhydrous ethanol and ultrasonically treated to remove impurities and dried, and then the dried Tencel film is immersed in bio-glue and stirred; the bio-glue is a mixed solution containing dopamine hydrochloride and tromethamine.

[0014] Preferably, in the preferred embodiment of the present invention, the impurity removal process is as follows: ultrasonic treatment at 60°C for 8 hours.

[0015] Preferably, in the preferred embodiment of the present invention, the Tencel film has a specification of 80-150 g / m². 2 .

[0016] Preferably, in the preferred embodiment of the present invention, the concentration of dopamine hydrochloride in the bio-glue is 0.2 wt%, and the concentration of tromethamine is 0.12 wt%.

[0017] Furthermore, in the above technical solution, the preparation process of the photoelectric thermal film composite carbon nanotube in step S2 is as follows: using the photoelectric thermal film pretreated in step S1 as a filter membrane, the carbon nanotube dispersion prepared in step (1) is passed through a vacuum filtration device, so that the carbon nanotubes in the dispersion are deposited on the photoelectric thermal film. After filtration, the film is dried to obtain the photoelectric thermal film composite carbon nanotube.

[0018] Preferably, in a preferred embodiment of the present invention, the preparation method of the carbon nanotube dispersion is as follows: 300 mg of Triton 100 (surfactant) and 30 mg of carbon nanotubes are dissolved in 100 g of deionized water and sonicated at 100 W for 1 hour. The dispersion is allowed to stand for 24 hours. The prepared dispersion is centrifuged at 5000 r / min for 15 min, and the supernatant is taken as the carbon nanotube dispersion with good dispersibility.

[0019] Preferably, in the above technical solution, the number of times the filtration is performed in step S2 can be from 1 to multiple times. In a preferred embodiment of the present invention, the number of times the carbon nanotube dispersion is repeatedly filtered is 5-10 times.

[0020] Furthermore, in the above technical solution, the preparation process of the photoelectric and thermal film twisted composite yarn in step S3 is as follows: the Tencel film after carbon nanotube composite obtained in step S2 is cut into 15-30mm pieces to obtain photoelectric and thermal film cutting strips; then the photoelectric and thermal film cutting strips are twisted on a digital sample spinning machine with the following process parameters: linear speed 8-10m / min, twist 2-3T / cm, and spindle speed 6000-8000rpm; during the film twisting process, the wire is used as the core yarn so that the wire can be wrapped in the film twisted yarn to obtain the photoelectric and thermal film twisted composite yarn.

[0021] A third objective of this invention is to provide a photoelectric thermal film twisted composite yarn fabric, comprising the aforementioned photoelectric thermal film twisted composite yarn.

[0022] Furthermore, the above-mentioned technical solution, the method for preparing the photoelectric thermal film twisted composite yarn fabric, includes the following steps:

[0023] The fabric is woven using photoelectric thermal film twisted composite yarn as the weft yarn to form a satin or interwoven structure; then the selvage of the fabric is locked and twisted to lock the two ends of the photoelectric thermal film twisted composite yarn to prevent the film twisted yarn structure from loosening; then the two ends of the film twisted yarn are cut to expose the two poles of the wire. At this time, the adjacent weft yarns form a parallel structure, which can be connected to an external power source.

[0024] Furthermore, in the above technical solution, the warp yarns of the fabric are made of black nylon yarn, with a specific weft density of 30-50 yarns / 10cm.

[0025] A fourth objective of this invention is to provide a photoelectric thermal interface evaporator fabric, the fabric comprising the aforementioned photoelectric thermal film twisted composite yarn fabric. The yarn and fabric of this invention possess high photoelectric thermal conversion efficiency, high water transport performance, and excellent evaporation performance.

[0026] A fifth objective of this invention is to provide a photoelectric thermal evaporator, comprising the photoelectric thermal interface evaporator fabric described above.

[0027] Compared with the prior art, the present invention relates to a method for preparing and applying a photoelectric thermal film twisted composite yarn and its fabric, which has the following beneficial effects:

[0028] 1. This invention uses Tencel film as a carbon nanotube carrier. Its softness and water absorption characteristics provide a processing basis for film twisting yarn technology, and the prepared yarn has certain water absorption and strength.

[0029] 2. In this invention, carbon nanotubes are loaded onto a Tencel film and then further twisted into yarn. The spiral structure provides sufficient water absorption pores and excellent water circulation channels for seawater evaporation, achieving strong self-cleaning ability and high-efficiency water supply evaporation after salt evaporation, and further enhancing yarn strength.

[0030] 3. The wire used in this invention is preferably a commercial wire, which is used as the core yarn inside the film-twisted yarn. The composite carbon nanotube fibers inside the film-twisted yarn exhibit a uniform directional distribution. After being energized, the Tencel film loaded with carbon nanotubes has a good and stable conductive heating effect and improved electrothermal conversion efficiency.

[0031] 4. This invention uses both photothermal and electrothermal methods to ensure continuous and efficient fabric heating, achieving excellent overall evaporation performance under conditions of insufficient sunlight during the day, no sunlight at night, and day-night cycles, thus maintaining a stable and superior evaporation effect.

[0032] 5. The present invention uses a satin or interwoven structure, which greatly reduces the stress on the photoelectric and thermal composite yarn, which is used as the weft yarn, caused by the other set of yarns, and reduces the influence of deformation on the change in the twisted resistance of the carbon nanotube film.

[0033] 6. The carbon nanotubes used in this invention have a certain degree of conductivity. After being composited with a Tencel film, they exhibit conductive heating properties with relatively high resistance. The conductive heating components are formed in parallel using a woven fabric structure, reducing the overall fabric resistance. When connected to an external low-voltage power supply, high heating efficiency can be achieved, with high safety and significant economic benefits. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 The present invention relates to the preparation process of the photoelectric thermal film twisted composite yarn and its fabric;

[0036] Figure 2 This is a comparison of the concentrations of various ions in the Yellow Sea seawater before and after evaporation in Example 1.

[0037] Figure 3 This refers to the mass loss of brine under 3V DC in Example 1, regardless of the weather conditions.

[0038] Figure 4 The temperature of the fabric surface under different DC voltages in Example 1;

[0039] Figure 5 The evaporation rates are shown under different DC voltages in Example 1. Detailed Implementation

[0040] The present invention will be further described in detail below through implementation examples. These implementation examples are carried out based on the technology of the present invention. Detailed implementation methods and specific operating procedures are provided to illustrate the inventiveness of the present invention, but the scope of protection of the present invention is not limited to the following implementation examples.

[0041] Based on the information contained in this application, various modifications to the precise description of the invention can be readily made by those skilled in the art. It should be understood that the scope of the invention is not limited to the defined processes, properties, or components, as these embodiments and other descriptions are merely illustrative of specific aspects of the invention.

[0042] To better understand the invention and not to limit its scope, all figures indicating amounts, percentages, and other numerical values ​​used in this application should, in all cases, be understood to be modified by the word "approximately." Therefore, unless otherwise stated, the numerical parameters listed in the specification are approximate values ​​and may vary depending on the desired properties being sought. Each numerical parameter should at least be considered as obtained based on reported significant figures and through conventional rounding methods.

[0043] The equipment and raw materials used in this invention are all commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field.

[0044] The Tencel film involved in the following embodiments of the present invention was purchased from Shanghai Munger Biotechnology Co., Ltd., and its product number is MG-SP001.

[0045] The carbon nanotubes involved in the following embodiments of the present invention were purchased from Beijing Carbon Yang Technology Co., Ltd., CAS No.: 308068-56-6.

[0046] The dopamine hydrochloride involved in the following embodiments of the present invention was purchased from Shaanxi Xinkang Biotechnology Co., Ltd., CAS No.: 62-31-7.

[0047] The tromethamine involved in the following embodiments of the present invention was purchased from Shandong Deyan Chemical Co., Ltd., CAS No.: 36150-01-3.

[0048] The commercial electrical wires involved in the following embodiments of the present invention were purchased from Dongguan Yuntong Metal Materials Co., Ltd., with the item number ZTX200803-1.

[0049] The Triton 100 involved in the following embodiments of the present invention was purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd., CAS No. (9002-93-1).

[0050] The isopropanol used in the following embodiments of the present invention was purchased from Henan Qilong Chemical Co., Ltd., CAS No. (67-63-0).

[0051] The data recording and analysis process involved in the following embodiments is as follows: The experiment was conducted under standard indoor conditions (24°C, 50% humidity), with real-time mass changes monitored by an electronic balance, and solar radiation provided by a solar simulation irradiance instrument; the evaporation rate was calculated using the following formula. (Δm represents the change in evaporating mass, S represents the evaporating area, and t represents the evaporation time); Numerical simulation of electrothermal conversion: The energy balance law is introduced to evaluate the saturation temperature of the heater. The saturation surface temperature depends on the applied voltage, material resistance, and heat transfer coefficient. The formula is as follows: In the formula, U is the applied voltage, R is the sheet resistance, c is the specific heat capacity, m is the CTFF weight, T is the saturated surface temperature, T0 is the initial temperature, A is the electrothermal area, and h represents the heat transfer coefficient; the surface temperature is recorded by an infrared camera and an ion concentration tracker.

[0052] In the following embodiments of the present invention, the water absorption rate of the film-twisted yarn was tested according to Clause 8.1 of GB / T21655.1-2008 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 1: One-way combination test method": A 10cm long sample was naturally suspended vertically, soaked for 5 minutes, and then taken out. When the sample stopped dripping water (when the interval between two water drops is not less than 30 seconds, it is considered that no more water is dripping), the weight of the sample was weighed, and the percentage of water absorbed by the sample to the original mass was calculated. The calculation formula is A = (m - m0) / m0 × 100%, where A is the water absorption rate (%), m0 is the original weight of the sample (g), and m is the weight of the sample after soaking and dripping water (g).

[0053] Example 1

[0054] The method for preparing a photoelectric thermal film twisted composite yarn according to this embodiment includes the following steps:

[0055] S1: Pretreatment of photothermal thin film: 80g / m 2 The Tencel film of the specified specifications was ultrasonically treated with anhydrous ethanol at 60°C for 8 hours to remove impurities, and then dried. The dried Tencel film was then immersed in a bio-adhesive and stirred for 30 minutes. The bio-adhesive was specifically formulated as a mixed solution containing 0.2 wt% dopamine hydrochloride and 0.12 wt% tromethamine.

[0056] The specific preparation process of the biogel is as follows: add dopamine hydrochloride and tromethorphan to deionized water in sequence, wherein the mass ratio of dopamine hydrochloride to tromethorphan is 5:3. Then place the above reagents in centrifuge tubes of deionized water and sonicate to dissolve them. Continue for 30 minutes until a gel is formed.

[0057] S2: Preparation of photoelectric and thermal thin film composite carbon nanotubes:

[0058] (1) Preparation of carbon nanotube dispersion, the specific method is as follows:

[0059] Take 300 mg of Triton 100 (surfactant) and 30 mg of carbon nanotubes, add them to 100 g of deionized water, sonicate at 100 W for 1 hour, let the dispersion stand for 24 hours, centrifuge the prepared dispersion at 5000 r / min for 15 min, and take the supernatant as the well-dispersed carbon nanotube dispersion.

[0060] (2) Using the photothermal film pretreated in step S1 as a filter membrane, the carbon nanotube dispersion prepared in step (1) is passed through a vacuum filtration device, causing the carbon nanotubes in the dispersion to deposit on the photothermal film. After filtration, it is washed with excess isopropanol. Then, it is rinsed with excess deionized water to remove Triton 100. It is placed in a vacuum drying oven and dried at 65°C for 24 hours. This step is repeated 5 times to obtain the photothermal film composite carbon nanotubes.

[0061] S3: Preparation of the photoelectric thermal film twisted composite yarn: The photoelectric thermal film composite carbon nanotube sample obtained in S2 above was cut into 25mm pieces using a cutter. The cut strips were then twisted on a digital sample spinning machine. The specific process parameters were: linear speed 8m / min, twist 2T / cm, and spindle speed 6000rpm. Commercially available electrical wire with a diameter of 0.1mm was used as the core yarn for conductivity, and the yarn diameter was controlled within 2.5-3mm.

[0062] S4: Preparation of the photoelectric heating film twisted composite yarn fabric: The yarn from S3 above is further used as the weft yarn for fabric weaving, specifically weaving into an interlaced structure. The fabric selvage is then spun and locked, and the film twist layer before the weft yarn spun and locked is removed, leaving the two-pole interface of the heating wire, connected to an external 3V power supply. Black nylon yarn is used for the warp yarn. The specific fabric specifications are: weft density: 40 threads / 10cm; the specific external power supply is a storage battery.

[0063] The evaporator obtained above was then tested for its evaporation performance and other properties:

[0064] The evaporator achieved a yield of 3.46 kg m³ under 3V voltage and one light intensity. -2 ·h -1 The evaporation rate was measured, and the ion concentration (Ca) in the condensate obtained after evaporation was detected. 2+ Mg 2+ Na + K + The concentration is far below the World Health Organization's drinking water standards. After 10 days of continuous operation in a 3.5 wt% saline solution, over 35 kg of water was obtained, with over 21.5 kg obtained in a 10 wt% saline solution. After working in a high-concentration (30 wt%) saline solution for over 72 hours, no large-area salt deposition was observed on the surface, and the fabric showed an increase of 1.3 g in salt content. Salt deposition on the fabric's interior and surface was within normal limits and had no impact on evaporation efficiency. The light intensity was 1 lx, and the light exposure time was 5 hours.

[0065] Regarding the self-cleaning ability of fabrics: 0.5g of crystalline salt particles were evenly placed on the surface of the evaporator. Under daylight conditions, the salt particles completely dissolved after 0.5 hours of brine circulation. Under nighttime conditions without light, the brine circulation was weaker, and the salt particles completely dissolved after 2 hours.

[0066] The effects of factors on the water absorption performance of the membrane-twisted yarn include: the original Tencel membrane thickness, the number of times carbon nanotubes are impregnated, the twist of the membrane-twisted yarn, and the cutting width. In this embodiment, the water absorption rate of the membrane-twisted yarn prepared above reaches 3.8 g / (cm). 2 ·min).

[0067] The influence of the film-twisted yarn on its conductivity is determined by: the original Tencel film thickness, the number of carbon nanotube impregnation cycles, the twist of the film-twisted yarn, and the cutting width. In this embodiment, the resistance of the film-twisted yarn prepared above is 1500 Ω / 10cm.

[0068] The effects of external voltage on fabric surface temperature, evaporation rate, and the amount of moisture on the fabric surface were as follows: When the external voltage was 0, 1, 2, and 3V, after 300 seconds of voltage testing and 1 hour of solar radiation exposure, the surface temperatures of the moist fabric reached 38.8℃, 45.7℃, 51.9℃, and 57.5℃, respectively. When the external voltage was 0, 1, 2, and 3V, after one hour of voltage testing and 1 hour of solar radiation exposure, the evaporation rates were 1.02, 1.75, 2.31, and 3.46 kg / m³, respectively. -2 ·h -1 .

[0069] in Figure 1 This includes steps such as sizing, drying, cutting, yarn twisting, and weaving; among which... Figure 2 This indicates the following conclusion: The various ions (Ca) in the condensate after evaporation... 2+ Mg 2+ Na + K + The concentration of each ion (Ca) before and after evaporation is lower than the World Health Organization's standard for drinking water. 2+ Mg 2+ Na + K + The concentration decreased significantly, indicating excellent evaporation effect; among which Figure 3 The following conclusions are drawn: Under continuous DC power supply of 3V and all-day weather conditions, the mass change of 3.5w% brine is particularly significant during sunlight exposure from 6:00 AM to 7:00 PM. At night, under no-light conditions, a relatively stable evaporation effect is maintained. Figure 4 The following conclusions are drawn: different DC voltages increase the surface temperature of the fabric to a certain extent; the higher the input voltage, the higher the surface temperature of the evaporator. Figure 5 The results indicate that different DC voltages can improve the evaporation rate of fabrics, and the higher the input voltage, the higher the evaporation efficiency.

[0070] Example 2

[0071] This embodiment describes a method for preparing a photoelectric thermal film twisted composite yarn. This embodiment is similar to Embodiment 1, except that it uses 100g / m² yarn. 2 The Tencel film was repeatedly filtered through a carbon nanotube dispersion 10 times, and then cut into 30mm pieces using a 1200Ω heating wire and a cutter. The linear speed was 9m / min, the twist was 2.5T / cm, and the spindle speed was 7000rpm. The specific fabric specifications were a weft density of 30 threads / 10cm; the specific external power supply was a combination of a battery and a solar panel.

[0072] The evaporator obtained above was then tested for its evaporation performance:

[0073] The evaporator achieved a yield of 5.3 kg m³ under 6V voltage and one light intensity. -2 ·h -1 The evaporation rate was measured, and the ion concentration (Ca) in the condensate obtained after evaporation was detected. 2+ Mg 2+ Na + K + The water content is far below the World Health Organization's drinking water standards. After 10 days of continuous operation in a 3.5 wt% saline solution, over 48 kg of water was obtained, with over 31.5 kg obtained in a 10 wt% saline solution. After operating in a high-concentration (30 wt%) saline solution for over 72 hours, no large-area salt buildup was observed on the surface, indicating that the evaporator has strong self-cleaning capabilities. The light intensity was 1 lx, and the illumination time was 5 hours.

[0074] Regarding the self-cleaning ability of fabrics: 0.5g of crystalline salt particles were evenly placed on the surface of the evaporator. Under daylight conditions, the salt particles were completely dissolved after 0.3 hours of brine circulation. Under nighttime conditions without light, the brine circulation was weaker, and the salt particles were completely dissolved after 1.5 hours.

[0075] The effects of factors on the water absorption performance of the membrane-twisted yarn include: the original Tencel membrane thickness, the number of times carbon nanotubes are impregnated, the twist of the membrane-twisted yarn, and the cutting width. The membrane-twisted yarn prepared in this embodiment achieved a water absorption rate of 4.2 g / (cm²). 2 ·min).

[0076] Specifically, regarding the impact on water absorption performance, the original Tencel film thickness affects the overall number of pores in the yarn. Maximum adsorption is achieved after more than 10 impregnations with carbon nanotubes. The number of carbon nanotube impregnations affects the number of pores in the Tencel film, indirectly reducing water absorption capacity. The twist of the yarn determines the degree of yarn pore compression, which to some extent determines water absorption capacity. The cutting width determines the diameter of the yarn.

[0077] The influence of the film-twisted yarn on its conductivity is determined by factors such as the original Tencel film thickness, the number of carbon nanotube impregnation cycles, the twist of the film-twisted yarn, and the cutting width. The film-twisted yarn prepared in this embodiment has a resistance of 1200 Ω / 10cm.

[0078] Specifically, the original Tencel film thickness determines the degree of carbon nanotube adhesion; the higher the proportion of carbon nanotubes, the better the conductivity. The twist of the film-twisted yarn affects the fiber spacing of the Tencel film, further influencing the contact effect of the carbon nanotubes attached to the Tencel film, and thus further affecting conductivity. The cutting width determines the diameter of the film-twisted yarn, which in turn determines conductivity.

[0079] The effects of external voltage on fabric surface temperature, evaporation rate, and the following: When the external voltage is 0, 1, 2, and 3V, after 300 seconds of voltage testing and 1 liter of solar radiation (1 lx light intensity, with the irradiation time consistent with the voltage test time of 300 s), the surface temperature of the wet fabric reaches 39.3℃, 46.7℃, 51.9℃, and 60.5℃, respectively. When the external voltage is 0, 1, 2, and 3V, after one hour of voltage testing and 1 liter of solar radiation, the evaporation rates are 1.11, 2.03, 2.69, and 3.78 kg / m³, respectively. -2 ·h -1 .

Claims

1. A method for preparing a photoelectric thermal film twisted composite yarn, characterized in that, Includes the following steps: S1: Pretreatment of photoelectric thermal film: The Tencel film is heated in anhydrous ethanol and ultrasonically treated to remove impurities and dried. Then the dried Tencel film is immersed in bio-glue and stirred. The bio-adhesive is a mixed solution containing dopamine hydrochloride and tromethamine, wherein the concentration of dopamine hydrochloride in the bio-adhesive is 0.2 wt% and the concentration of tromethamine is 0.12 wt%. The Tencel film has a specification of 80-150 g / m². 2 ; S2: Preparation of photoelectric thermal film composite carbon nanotubes: Using the photoelectric thermal film pretreated in step S1 as a filter membrane, the carbon nanotube dispersion prepared in step S1 is passed through a vacuum filtration device to deposit the carbon nanotubes in the dispersion onto the photoelectric thermal film. After filtration 5-10 times, the mixture is dried to obtain the photoelectric thermal film composite carbon nanotubes. The preparation method of the carbon nanotube dispersion is as follows: 300 mg of Triton 100 and 30 mg of carbon nanotubes are placed in 100 g of deionized water and sonicated at 100 W for 1 hour. The dispersion is allowed to stand for 24 hours. The prepared dispersion is centrifuged at 5000 r / min for 15 min and the supernatant is taken as the carbon nanotube dispersion with good dispersibility. S3: Preparation of photoelectric thermal film twisted composite yarn: The photoelectric thermal film composite carbon nanotubes obtained in step S2 are cut into strips and twisted with wires on a spinning machine to form the composite yarn.

2. The method according to claim 1, characterized in that: The specific preparation process of the photoelectric thermal film twisted composite yarn in step S3 is as follows: the Tencel film after carbon nanotube composite obtained in step S2 is cut into 15-30mm pieces to obtain photoelectric thermal film cutting strips; then the photoelectric thermal film cutting strips are twisted by a spinning machine with the following process parameters: linear speed 8-10m / min, twist 2-3T / cm, spindle speed 6000-8000rpm; during the film twisting process, the wire is used as the core yarn so that the wire can be wrapped inside the photoelectric thermal film cutting strip to obtain the photoelectric thermal film twisted composite yarn.

3. The photoelectric thermal film twisted composite yarn prepared by the method according to any one of claims 1-2.

4. A photoelectric thermal film twisted composite yarn fabric, characterized in that: Including the photoelectric thermal film twisted composite yarn prepared by the method described in any one of claims 1-2.

5. The method for preparing the photoelectric thermal film twisted composite yarn fabric according to claim 4, comprising the following steps: The fabric is woven using photoelectric thermal film twisted composite yarn as the weft yarn to form a satin or interwoven structure; then the selvage of the fabric is locked and twisted to lock the two ends of the photoelectric thermal film twisted composite yarn; then the two ends of the film twisted yarn are cut to expose the two poles of the wire.

6. A photoelectric thermal interface evaporator fabric, characterized in that: The fabric includes the photoelectric thermal film twisted composite yarn fabric of claim 4 or the photoelectric thermal film twisted composite yarn fabric prepared by the method of claim 5.

7. A photoelectric thermal evaporator, characterized in that: Includes the photoelectric thermal interface evaporator fabric as described in claim 6.

Images