High-thermal-conductivity cotton fabric and preparation method thereof

Abstract

The invention relates to a high-thermal-conductivity cotton fabric and a preparation method thereof.The preparation method comprises the steps that hydroxylated nano-diamond is placed in a solution containing 3-(trimethoxysilyl) propyl methacrylate to be subjected to first-time modification treatment, and first modified nano-diamond is obtained; mercaptomalic acid is added into the dispersion liquid of the first modified nano-diamond for second-time modification treatment, and second modified nano-diamond is obtained; adding a catalyst into the dispersion liquid of the second modified nano-diamond to obtain finishing liquid; putting the cotton fabric into the finishing liquid for padding treatment, and then drying and baking to obtain the cotton fabric with high thermal conductivity. According to the preparation method, the thermal conductivity of the cotton fabric can be remarkably improved, the cotton fabric can meet the performance requirements in the fields of cool fabric, special protective fabric and the like, and the method is simple, easy to operate and beneficial to application and popularization.

Description

Technical Field

[0001] This application relates to the field of textile production technology, and in particular to a cotton fabric with high thermal conductivity and a method for preparing the same. Background Technology

[0002] Cotton fiber, as a typical representative of natural cellulose fibers, occupies an important position in the textile and apparel industry due to its excellent moisture absorption and breathability, wearing comfort, and environmental friendliness. However, with the rapid growth in demand for functional textiles, the thermal conductivity of traditional cotton fibers is insufficient to meet the stringent requirements for thermal management performance in fields such as intelligent temperature-regulating clothing and special protective fabrics. The longitudinal thermal conductivity of pure cotton fiber is only 0.26 W / (m·K)~0.34 W / (m·K), and its porous structure and the low vibrational modulus of cellulose molecular chains severely limit the directional conduction of heat, leading to severe heat retention in fabrics in summer or an increased risk of heat stress in special protective clothing. Summary of the Invention

[0003] Therefore, it is necessary to provide a high thermal conductivity cotton fabric and its preparation method to address the above problems. The preparation method described in this application can significantly improve the thermal conductivity of cotton fabric, enabling it to meet the performance requirements of fields such as cooling fabrics and special protective fabrics. Furthermore, the method is simple and easy to operate, which is conducive to its widespread application.

[0004] A method for preparing a cotton fabric with high thermal conductivity includes the following steps:

[0005] Step 1: The hydroxylated nanodiamonds are placed in a solution containing propyl 3-(trimethoxysilyl)methacrylate for the first modification treatment to obtain the first modified nanodiamonds.

[0006] Step 2: Add mercaptomalic acid to the dispersion of the first modified nanodiamond for a second modification treatment to obtain the second modified nanodiamond.

[0007] Step 3: Add a catalyst to the dispersion of the second modified nanodiamond to obtain a finishing solution;

[0008] Step 4: After immersing the cotton fabric in the finishing solution, it is dried and baked to obtain a cotton fabric with high thermal conductivity.

[0009] In one embodiment, in the infrared spectrum, the peak intensity ratio of the carbonyl characteristic peak to the nitrogen impurity characteristic peak of the first modified nanodiamond is not less than 5:1.

[0010] In one embodiment, in the infrared spectrum, the peak intensity ratio of the carboxyl characteristic peak to the nitrogen impurity characteristic peak of the second modified nanodiamond is not less than 5:1.

[0011] In one embodiment, step one satisfies at least one of the following conditions:

[0012] (1) In the solution containing propyl 3-(trimethoxysilyl)methacrylate, the mass concentration of propyl 3-(trimethoxysilyl)methacrylate is 1%~3%;

[0013] (2) The temperature of the first modification treatment is 25℃~40℃, and the time is 1min~5min;

[0014] (3) After the first modification treatment, the first modified nanodiamond is obtained by filtration and drying at 100℃~120℃ for 10min~30min.

[0015] In one embodiment, step two satisfies at least one of the following conditions:

[0016] (1) In the dispersion of the first modified nanodiamond, the mass concentration of the first modified nanodiamond is 50 ct / L to 100 ct / L;

[0017] (2) The concentration of the mercaptomalic acid in the dispersion is 10 g / L to 30 g / L;

[0018] (3) Adjust the dispersion to acidity before adding mercaptomalic acid;

[0019] (4) The temperature of the second modification treatment is 80℃~100℃ and the time is 9h~12h;

[0020] (5) After the second modification treatment, the second modified nanodiamond is obtained by filtration and drying at 100℃~120℃ for 10min~30min.

[0021] In one embodiment, step three satisfies at least one of the following conditions:

[0022] (1) The catalyst is selected from hypophosphite;

[0023] (2) In the finishing solution, the mass ratio of the catalyst to the second modified nanodiamond is (1~2):1;

[0024] (3) In the dispersion of the second modified nanodiamond, the mass concentration of the second modified nanodiamond is 50 ct / L to 100 ct / L.

[0025] In one embodiment, step four satisfies at least one of the following conditions:

[0026] (1) The slurry yield is 75%~85%;

[0027] (2) The dip-rolling process is selected from two dips and two rolls;

[0028] (3) The drying temperature is 85℃~100℃ and the time is 3min~5min;

[0029] (4) The baking temperature is 150℃~180℃ and the time is 2min~4min.

[0030] In one embodiment, the nanodiamond is treated by at least one of piranha solution immersion, nitric acid-sulfuric acid mixture immersion, or hydrogen-oxygen plasma etching to obtain the hydroxylated nanodiamond.

[0031] In one embodiment, the nanodiamond has a particle size of less than or equal to 100 nm.

[0032] A high thermal conductivity cotton fabric is prepared by the method described above for preparing high thermal conductivity cotton fabric.

[0033] The preparation method described in this application uses a specific modifier to first modify the hydroxylated nanodiamonds. Through Si-OC covalent bonding, abundant ethylene carbonyl groups are grafted onto the surface as reaction end groups. Then, in the second modification treatment, a "thiol-olefin" click reaction is used to covalently graft mercaptomalic acid onto the diamond surface, significantly increasing the carboxyl content on the surface of the second modified nanodiamonds. This covalent bonding enhances the loading capacity and stability of the second modified nanodiamonds on the cotton fabric surface, thereby reducing interfacial phonon scattering between diamond and cotton fibers, lowering the interfacial thermal resistance, and rapidly dissipating heat through the ultra-high thermal conductivity of diamond, thus significantly improving the thermal conductivity of the cotton fabric. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 X-ray diffraction pattern of the high thermal conductivity cotton fabric prepared in Example 1;

[0036] Figure 2 The infrared spectrum of the first modified nanodiamond prepared in Example 1;

[0037] Figure 3 The infrared spectrum of the second modified nanodiamond prepared in Example 1 is shown. Detailed Implementation

[0038] To facilitate understanding of this application, it will be described in more detail below. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments or implementations only and is not intended to be limiting of the application. In this application, when numerical ranges are mentioned, unless otherwise specified, such ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, it includes every integer between the minimum and maximum values ​​of the range. Furthermore, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0040] This application provides a method for preparing a cotton fabric with high thermal conductivity, comprising the following steps:

[0041] Step 1: The hydroxylated nanodiamonds are placed in a solution containing propyl 3-(trimethoxysilyl)methacrylate for the first modification treatment to obtain the first modified nanodiamonds.

[0042] Step 2: Add mercaptomalic acid to the dispersion of the first modified nanodiamond for a second modification treatment to obtain the second modified nanodiamond.

[0043] Step 3: Add a catalyst to the dispersion of the second modified nanodiamond to obtain a finishing solution;

[0044] Step 4: After immersing the cotton fabric in the finishing solution, it is dried and baked to obtain a cotton fabric with high thermal conductivity.

[0045] In step one, a specific modifier is used to first modify the hydroxylated nanodiamond. The surface of the nanodiamond is then grafted with abundant ethylene carbonyl groups as reaction end groups through Si-OC covalent bonds. As a strongly polar functional group, the carbonyl group can reduce the electron density of the ortho-double bond through its electron-withdrawing inductive effect, which is conducive to the attack of the double bond by the thiol group. This enhances the reactivity of the ortho-double bond, promotes directional coupling, and enhances the stability of the grafted product.

[0046] In one embodiment of this application, in the infrared spectrum, the peak intensity ratio of the carbonyl characteristic peak to the nitrogen impurity characteristic peak of the first modified nanodiamond is not less than 5:1. At this point, the ethylene carbonyl groups covalently bonded to the surface of the first modified nanodiamond reach a specific content, which is beneficial for providing a stable basic structure for subsequent second modification. If the peak intensity ratio is less than 1:5, the surface ethylene carbonyl content is insufficient, which will lead to a lower density of subsequent grafted functional groups, thereby reducing the loading capacity and loading stability of the modified nanodiamonds on the cotton fabric surface.

[0047] It is understood that the peak intensity ratio of the carbonyl characteristic peak to the nitrogen impurity characteristic peak of the first modified nanodiamond is, but is not limited to, any value among 5:1, 6:1, 7:1, 8:1, and 9:1, or any range between the two; the carbonyl characteristic peak is at 1650 cm⁻¹. -1 ~1750cm -1 Stretching vibrations within the wavelength range; characteristic peaks of nitrogen impurities are at 1100 cm⁻¹. -1 ~1200cm -1 Extensive vibration within the wavelength range.

[0048] In one embodiment of this application, the mass concentration of 3-(trimethoxysilyl)methacrylate in the solution containing propyl methacrylate is 1% to 3%, including but not limited to any one of 1%, 1.5%, 2%, 2.5%, 3%, or any range between two of them.

[0049] It should be noted that this application does not limit the solvent for dispersing propyl 3-(trimethoxysilyl)methacrylate, including but not limited to water, organic solvents, etc., with ethanol aqueous solution being preferred.

[0050] In one embodiment of this application, the temperature of the first modification treatment is 25℃~40℃, including but not limited to any one of 25℃, 30℃, 35℃, 40℃ or any range between two of them; the time is 1min~5min, including but not limited to any one of 1min, 2min, 3min, 4min, 5min or any range between two of them.

[0051] In one embodiment of this application, after the first modification treatment, the first modified nanodiamond is obtained by filtration and drying at 100°C to 120°C for 10 min to 30 min.

[0052] In one embodiment of this application, the nanodiamond is treated by at least one of the following methods: immersion in piranha solution, immersion in a mixture of nitric acid and sulfuric acid, or hydrogen-oxygen plasma etching, to obtain the hydroxylated nanodiamond. Preferably, the nanodiamond is treated by immersion in piranha solution, wherein the particle size of the nanodiamond is less than or equal to 100 nm, including but not limited to any value of 10 nm, 20 nm, 50 nm, 80 nm, or 100 nm, or any range between two of them.

[0053] In step two, the conjugated carbonyl group is used to promote the directional coupling of the double bond and the mercapto group to form a stable CS covalent bond, which enhances the grafting stability. On the one hand, since two carboxyl groups are grafted onto one reaction site, the carboxyl content on the surface of the second modified nanodiamond is greatly increased. This can improve the loading capacity and loading stability of the second modified nanodiamond on the surface of the cotton fabric through covalent bonding, thereby reducing the interfacial phonon scattering between the diamond and the cotton fiber, reducing the interfacial thermal resistance between the diamond and the cotton fiber, and rapidly dissipating heat through the ultra-high thermal conductivity of the diamond, thus significantly improving the thermal conductivity of the cotton fabric.

[0054] On the other hand, the second modified nanodiamond surface has a dicarboxylic acid molecular layer with a well-defined covalent anchoring direction. Each carboxylic acid molecule stands on the surface in a similar manner, avoiding the disorder and desorption problems common in physical adsorption. This makes the surface chemical environment orderly and controllable. Furthermore, the spatially close dicarboxylic acid groups can synergistically form a covalent bond network with multiple hydroxyl groups on the cotton fiber. Compared with single-point bonding, multi-site bonding is stronger and more stable. Therefore, this structure creates a highly ordered, stable and powerful two-dimensional interface, which is particularly suitable for directional fixation on cotton fibers.

[0055] In one embodiment of this application, in the infrared spectrum, the peak intensity ratio of the carboxyl characteristic peak to the nitrogen impurity characteristic peak of the second modified nanodiamond is not less than 5:1. At this point, the dihydroxyl groups covalently bonded to the surface of the second modified nanodiamond reach a specific content, providing the optimal structure for subsequent covalent bonding with cotton fibers. If the peak intensity ratio is less than 5:1, the surface dihydroxyl content is insufficient, which will lead to a lower density of the subsequently grafted cotton fibers, thereby reducing the loading capacity and loading stability of the modified nanodiamond on the cotton fabric surface.

[0056] It is understood that the peak intensity ratio of the carboxyl characteristic peak to the nitrogen impurity characteristic peak of the second modified nanodiamond is, but is not limited to, any value among 5:1, 6:1, 7:1, 8:1, and 9:1, or any range between the two; the carboxyl characteristic peak is at 3400 cm⁻¹. -1 ~3600cm -1 Stretching vibrations within the wavelength range; characteristic peaks of nitrogen impurities are at 1100 cm⁻¹. -1 ~1200cm -1Extensive vibration within the wavelength range.

[0057] In one embodiment of this application, the mass concentration of the first modified nanodiamond in the dispersion of the first modified nanodiamond is 50 ct / L to 100 ct / L, which is more conducive to the uniform dispersion of the first modified nanodiamond.

[0058] It is understood that the mass concentration of the first modified nanodiamond is not limited to any one of 50 ct / L, 60 ct / L, 70 ct / L, 80 ct / L, 90 ct / L, 100 ct / L or any range between two; this application does not limit the solvent for dispersing the first modified nanodiamond, but water is preferred as the solvent.

[0059] In one embodiment of this application, the concentration of the mercaptomalic acid in the dispersion is 10 g / L to 30 g / L, including but not limited to any one of 10 g / L, 15 g / L, 20 g / L, 25 g / L, and 30 g / L, or any range between two of them.

[0060] In one embodiment of this application, adjusting the dispersion to acidic before adding mercaptomalic acid helps to ensure that the mercapto groups are not oxidized, maintain their reactivity, and thus improve the grafting rate.

[0061] In one embodiment of this application, the temperature of the second modification treatment is 80℃~100℃, including but not limited to any one of 80℃, 85℃, 90℃, 95℃, 100℃ or any range between two; the time is 9h~12h, including but not limited to any one of 9h, 10h, 11h, 12h or any range between two.

[0062] In one embodiment of this application, after the second modification treatment, the material is filtered and dried at 100°C to 120°C for 10 min to 30 min to obtain the second modified nanodiamond.

[0063] In step three, when preparing the finishing solution, a catalyst can be added to promote the grafting of dicarboxyl groups with cotton fibers. The catalyst is preferably a hypophosphite, including but not limited to at least one of sodium hypophosphite, potassium hypophosphite, and ammonium hypophosphite.

[0064] In one embodiment of this application, in the finishing solution, the mass ratio of the catalyst to the second modified nanodiamond is (1~2):1, including but not limited to any one of 1:1, 1.2:1, 1.5:1, 1.8:1, 2:1 or any range between two.

[0065] In one embodiment of this application, the mass concentration of the second modified nanodiamond in the dispersion of the second modified nanodiamond is 50 ct / L to 100 ct / L, which is more conducive to the uniform dispersion of the second modified nanodiamond.

[0066] It is understood that the mass concentration of the second modified nanodiamond is not limited to any one of 50 ct / L, 60 ct / L, 70 ct / L, 80 ct / L, 100 ct / L or any range between two; this application does not limit the solvent for dispersing the second modified nanodiamond, but water is preferred as the solvent.

[0067] In step four, the dicarboxyl groups on the diamond surface can form covalent bonds with the hydroxyl groups in the cotton fibers through a conventional padding process. It is understood that this application does not limit the padding process. Preferably, the padding process is selected as two-dip two-roll, that is, the cotton fabric is immersed in the finishing solution, and the excess liquid is removed by rolling to achieve the first padding. Then, it is immersed in the finishing solution again and rolled again to complete the second padding.

[0068] In one embodiment of this application, the rolling yield is 75% to 85%, including but not limited to any one of 75%, 78%, 80%, 82%, and 85%, or any range between two of them.

[0069] It should be noted that the liquid-pickup ratio is the percentage of the weight of the liquid carried by the fabric after rolling to the weight of the dry fabric. The liquid-pickup ratio = (weight of fabric after rolling - weight of fabric before rolling) / weight of fabric before rolling × 100%.

[0070] In one embodiment of this application, the drying temperature is 85℃~100℃, including but not limited to any one of 85℃, 90℃, 95℃, 100℃ or any range between two of them; the drying time is 3min~5min, including but not limited to any one of 3min, 3.5min, 4min, 4.5min, 5min or any range between two of them.

[0071] In one embodiment of this application, the baking temperature is 150℃~180℃, including but not limited to any one of 150℃, 160℃, 170℃, 180℃ or any range between two of them; the baking time is 2min~4min, including but not limited to any one of 2min, 2.5min, 3min, 3.5min, 4min or any range between two of them.

[0072] This application also provides a high thermal conductivity cotton fabric, which is prepared by the method described above. This high thermal conductivity cotton fabric is comfortable and breathable, has a cooling sensation, and has a thermal conductivity of approximately 7.5 W / (m·K) to 8.5 W / (m·K), which can meet the performance requirements of fields such as cooling fabrics and special protective fabrics.

[0073] The high thermal conductivity cotton fabric and its preparation method will be further described below through specific embodiments. However, those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of this application. Unless otherwise specified, specific conditions in the embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments used without specified manufacturers are all commercially available conventional products.

[0074] Example 1

[0075] 60 ct nanodiamonds (80 nm in diameter) were immersed in a piranha solution for 60 min, washed, and dried to obtain hydroxylated nanodiamonds. Then, the hydroxylated nanodiamonds were immersed in a 2% (w / w) 95% ethanol solution of 3-(trimethoxysilyl)methacrylate at 30°C for 3 min, filtered, and dried at 110°C for 20 min to obtain the first modified nanodiamonds.

[0076] The dried nanodiamond was placed in 100 mL of water with a concentration of 60 ct / L, the pH was adjusted to 1 with sulfuric acid, heated to 90 °C, and 2.4 g of mercaptomalic acid was added. The reaction was carried out for 10 h, filtered and dried at 110 °C for 20 min to obtain the second modified nanodiamond.

[0077] The second modified nanodiamond was dispersed in an aqueous solution at a concentration of 60 ct / L, and sodium hypophosphite catalyst at a concentration of 18 g / L was added to prepare the finishing solution.

[0078] The cotton fabric was dipped and rubbed twice in a finishing solution with a rubbing rate of 80%, then dried at 90°C for 4 minutes, and then baked at 160°C for 3 minutes to obtain a cotton fabric with high thermal conductivity.

[0079] X-ray diffraction tests were performed on the high thermal conductivity cotton fabric prepared in this embodiment, and the results are as follows: Figure 1 As shown, a characteristic peak of the diamond 111 facet appears at around 43.5°, which proves that the surface of the cotton fabric is loaded with diamond.

[0080] Example 2

[0081] 70 ct nanodiamonds (80 nm in diameter) were immersed in a piranha solution for 60 min, washed, and dried to obtain hydroxylated nanodiamonds. Then, the hydroxylated nanodiamonds were immersed in a 2% (w / w) 95% ethanol solution of 3-(trimethoxysilyl)methacrylate at 30°C for 3 min, filtered, and dried at 110°C for 20 min to obtain the first modified nanodiamonds.

[0082] The dried nanodiamond was placed in 100 mL of water with a concentration of 70 ct / L, the pH was adjusted to 1 with sulfuric acid, heated to 90 °C, and 2.8 g of mercaptomalic acid was added. The reaction was carried out for 10 h, filtered and dried at 110 °C for 20 min to obtain the second modified nanodiamond.

[0083] The second modified nanodiamond was dispersed in an aqueous solution at a concentration of 70 ct / L, and sodium hypophosphite catalyst at a concentration of 21 g / L was added to prepare the finishing solution.

[0084] The cotton fabric was dipped and rubbed twice in a finishing solution with a rubbing rate of 80%, then dried at 90°C for 4 minutes, and then baked at 160°C for 3 minutes to obtain a cotton fabric with high thermal conductivity.

[0085] Example 3

[0086] 50 ct of nanodiamonds (80 nm in diameter) were immersed in a piranha solution for 60 min, washed, and dried to obtain hydroxylated nanodiamonds. Then, the hydroxylated nanodiamonds were immersed in a 2% (w / w) 95% ethanol solution of 3-(trimethoxysilyl)methacrylate at 30°C for 3 min, filtered, and dried at 110°C for 20 min to obtain the first modified nanodiamonds.

[0087] The dried nanodiamond was placed in 100 mL of water with a concentration of 50 ct / L, the pH was adjusted to 1 with sulfuric acid, heated to 90 °C, and 2 g of mercaptomalic acid was added. The reaction was carried out for 10 h, filtered and dried at 110 °C for 20 min to obtain the second modified nanodiamond.

[0088] The second modified nanodiamond was dispersed in an aqueous solution at a concentration of 70 ct / L, and sodium hypophosphite catalyst at a concentration of 15 g / L was added to prepare the finishing solution.

[0089] The cotton fabric was dipped and rubbed twice in a finishing solution with a rubbing rate of 80%, then dried at 90°C for 4 minutes, and then baked at 160°C for 3 minutes to obtain a cotton fabric with high thermal conductivity.

[0090] Example 4

[0091] 60 ct nanodiamonds (100 nm in diameter) were immersed in a piranha solution for 60 min, washed, and dried to obtain hydroxylated nanodiamonds. Then, the hydroxylated nanodiamonds were immersed in a 1% (w / w) 95% ethanol solution of 3-(trimethoxysilyl)methacrylate at 25°C for 5 min, filtered, and dried at 100°C for 30 min to obtain the first modified nanodiamonds.

[0092] The dried nanodiamond was placed in 100 mL of water with a concentration of 50 ct / L, the pH was adjusted to 1 with sulfuric acid, heated to 80 °C, and 2.4 g of mercaptomalic acid was added. The reaction was carried out for 12 h, filtered and dried at 100 °C for 30 min to obtain the second modified nanodiamond.

[0093] The second modified nanodiamond was dispersed in an aqueous solution at a concentration of 50 ct / L, and potassium hypophosphite catalyst at a concentration of 20 g / L was added to prepare the finishing solution.

[0094] The cotton fabric was dipped and nibbled twice in a finishing solution with a nibbling rate of 75%, then dried at 85°C for 5 minutes, and then baked at 150°C for 4 minutes to obtain a cotton fabric with high thermal conductivity.

[0095] Example 5

[0096] 60 ct nanodiamonds (50 nm in diameter) were immersed in a piranha solution for 60 min, washed, and dried to obtain hydroxylated nanodiamonds. Then, the hydroxylated nanodiamonds were immersed in a 3% (w / w) 95% ethanol solution of 3-(trimethoxysilyl)methacrylate at 40 °C for 1 min, filtered, and dried at 120 °C for 10 min to obtain the first modified nanodiamonds.

[0097] The dried nanodiamond was placed in 100 mL of water with a concentration of 60 ct / L, the pH was adjusted to 1 with sulfuric acid, heated to 100 °C, and 2.4 g of mercaptomalic acid was added. The reaction was carried out for 9 h, filtered and dried at 120 °C for 10 min to obtain the second modified nanodiamond.

[0098] The second modified nanodiamond was dispersed in an aqueous solution at a concentration of 80 ct / L, and ammonium hypophosphite catalyst at a concentration of 16 g / L was added to prepare the finishing solution.

[0099] The cotton fabric was dipped and nibbled twice in a finishing solution with a nibbling rate of 85%, then dried at 100°C for 3 minutes, and then baked at 180°C for 2 minutes to obtain a cotton fabric with high thermal conductivity.

[0100] Example 6

[0101] The difference between Example 6 and Example 1 is that the hydroxylated nanodiamonds were soaked in a 2% (w / w) 95% ethanol solution of 3-(trimethoxysilyl)methacrylate for 1 min at 25°C.

[0102] Example 7

[0103] The difference between Example 7 and Example 1 is that the dried nanodiamonds were placed in 100 mL of water with a concentration of 60 ct / L, the pH was adjusted to 1 with sulfuric acid, heated to 60°C, and 2.4 g of mercaptomalic acid was added, and the reaction was carried out for 9 h.

[0104] Comparative Example 1

[0105] The difference between Comparative Example 1 and Example 1 is that an equal amount of (3-glycidyl etheroxypropyl)trimethoxysilane was used instead of 3-(trimethoxysilyl)propyl methacrylate.

[0106] Comparative Example 2

[0107] The difference between Comparative Example 2 and Example 1 is that an equal amount of 3-isocyanate-propyltriethoxysilane was used instead of 3-(trimethoxysilyl)methacrylate.

[0108] Comparative Example 3

[0109] The difference between Comparative Example 3 and Example 1 is that an equal amount of vinyltriethoxysilane was used instead of propyl 3-(trimethoxysilyl)methacrylate.

[0110] Comparative Example 4

[0111] The difference between Comparative Example 4 and Example 1 is that an equal amount of allyltrimethoxysilane was used instead of propyl 3-(trimethoxysilyl)methacrylate.

[0112] Comparative Example 5

[0113] The difference between Comparative Example 5 and Example 1 is that an equal amount of 11-allyloxyundecyltrimethoxysilane was used instead of 3-(trimethoxysilyl)propyl methacrylate.

[0114] Comparative Example 6

[0115] The difference between Comparative Example 6 and Example 1 is that an equal amount of peracetic acid was used instead of mercaptomalic acid.

[0116] Comparative Example 7

[0117] The difference between Comparative Example 7 and Example 1 is that an equal amount of 3-mercaptopropionic acid was used instead of mercaptomalic acid.

[0118] Comparative Example 8

[0119] The difference between Comparative Example 8 and Example 1 is that an equal amount of cysteine ​​is used instead of thiomalic acid.

[0120] Comparative Example 9

[0121] The difference between Comparative Example 9 and Example 1 is that an equal amount of citric acid was used instead of mercaptomalic acid.

[0122] Comparative Example 10

[0123] The difference between Comparative Example 10 and Example 1 is that an equal amount of 2-(mercaptomethyl)pentanediic acid was used instead of mercaptomalic acid.

[0124] Infrared spectroscopy was performed on the first and second modified nanodiamonds prepared in all examples and comparative examples. The results are as follows: Figure 2 , Figure 3 And as shown in Table 1.

[0125] Table 1

[0126]

[0127] The cotton fabric without diamond loading was used as a blank sample. The thermal conductivity and weight gain of the cotton fabrics prepared in all examples and comparative examples, as well as the blank sample, were tested. The thermal conductivity was tested using a thermal conductivity meter. The weight gain was the ratio of the mass difference of the cotton fabric before and after treatment to the mass of the cotton fabric before treatment. The test results are shown in Table 2.

[0128] Table 2

[0129]

[0130] As shown in Tables 1 and 2, the cotton fabric provided in this application embodiment has a high thermal conductivity and the weight gain rate remains basically unchanged before and after washing, indicating that the modified diamond has a good bonding effect with cotton fibers, resulting in high stability of diamond load on the surface of the cotton fabric.

[0131] In Example 6, the reaction temperature was low and the time was short during the first modification, resulting in a low content of ethylene carbonyl groups grafted onto the surface. This led to a decrease in the loading of modified nanodiamonds on the cotton fabric surface, a reduction in thermal conductivity, and a decrease in load stability.

[0132] In Example 7, the reaction temperature was low and the time was short during the second modification, resulting in a low content of dicarboxyl groups grafted onto the surface. This led to a decrease in the loading of modified nanodiamonds on the cotton fabric surface, a reduction in thermal conductivity, and a decrease in load stability.

[0133] Although the coupling agents used in Comparative Examples 1 to 5 are structurally similar to propyl 3-(trimethoxysilyl)methacrylate used in this application, tests show that their thermal conductivity and load stability cannot match the performance advantages of this application. Although the carboxylic acid grafts used in Comparative Examples 6 to 10 are structurally similar to thiomalic acid used in this application, tests show that their thermal conductivity and load stability cannot match the performance advantages of this application. For example, in Example 10, the carbon chain lengths of the two carboxyl groups are different from those of thiomalic acid, resulting in reduced binding force. After washing with water, the diamond loading decreases and the load stability declines.

[0134] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for preparing a cotton fabric with high thermal conductivity, characterized in that, Includes the following steps: Step 1: The hydroxylated nanodiamonds are placed in a solution containing propyl 3-(trimethoxysilyl)methacrylate for the first modification treatment to obtain the first modified nanodiamonds. Step 2: Add mercaptomalic acid to the dispersion of the first modified nanodiamond for a second modification treatment to obtain the second modified nanodiamond. Step 3: Add a catalyst to the dispersion of the second modified nanodiamond to obtain a finishing solution; Step 4: After immersing the cotton fabric in the finishing solution, it is dried and baked to obtain a cotton fabric with high thermal conductivity.

2. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, In the infrared spectrum, the peak intensity ratio of the carbonyl characteristic peak to the nitrogen impurity characteristic peak of the first modified nanodiamond is not less than 5:

1.

3. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, In the infrared spectrum, the peak intensity ratio of the carboxyl characteristic peak to the nitrogen impurity characteristic peak of the second modified nanodiamond is not less than 5:

1.

4. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, Step one must satisfy at least one of the following conditions: (1) In the solution containing propyl 3-(trimethoxysilyl)methacrylate, the mass concentration of propyl 3-(trimethoxysilyl)methacrylate is 1%~3%; (2) The temperature of the first modification treatment is 25℃~40℃, and the time is 1min~5min; (3) After the first modification treatment, the first modified nanodiamond is obtained by filtration and drying at 100℃~120℃ for 10min~30min.

5. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, Step two must satisfy at least one of the following conditions: (1) In the dispersion of the first modified nanodiamond, the mass concentration of the first modified nanodiamond is 50 ct / L to 100 ct / L; (2) The concentration of the mercaptomalic acid in the dispersion is 10 g / L to 30 g / L; (3) Adjust the dispersion to acidity before adding mercaptomalic acid; (4) The temperature of the second modification treatment is 80℃~100℃ and the time is 9h~12h; (5) After the second modification treatment, the second modified nanodiamond is obtained by filtration and drying at 100℃~120℃ for 10min~30min.

6. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, Step 3 must satisfy at least one of the following conditions: (1) The catalyst is selected from hypophosphite; (2) In the finishing solution, the mass ratio of the catalyst to the second modified nanodiamond is (1~2):1; (3) In the dispersion of the second modified nanodiamond, the mass concentration of the second modified nanodiamond is 50 ct / L to 100 ct / L.

7. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, Step four must satisfy at least one of the following conditions: (1) The slurry yield is 75%~85%; (2) The dip-rolling process is selected from two dips and two rolls; (3) The drying temperature is 85℃~100℃ and the time is 3min~5min; (4) The baking temperature is 150℃~180℃ and the time is 2min~4min.

8. The method for preparing high thermal conductivity cotton fabric according to claim 1, characterized in that, The hydroxylated nanodiamonds are prepared by treating the nanodiamonds with at least one of the following methods: immersion in a piranha solution, immersion in a mixture of nitric acid and sulfuric acid, or etching with hydrogen-oxygen plasma.

9. The method for preparing high thermal conductivity cotton fabric according to claim 8, characterized in that, The nanodiamond has a particle size of less than or equal to 100 nm.

10. A cotton fabric with high thermal conductivity, characterized in that, The high thermal conductivity cotton fabric is prepared by the method described in any one of claims 1 to 9.

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