A method for improving fabric comfort automatic control ability by means of local plasma enhancement effect

Abstract

The present application relates to the field of textile materials, and discloses a method for improving the automatic regulation ability of fabric comfort by means of local plasmonic enhancement effect, comprising the following steps: (1) preparing temperature-sensitive nanogel; (2) loading gold nanoparticles in the nanogel; (3) forming a composite nanogel coating on the surface of the cotton fabric by the dipping method to obtain the fabric with the automatic regulation ability of comfort; the present application first prepares the temperature-sensitive nanogel by emulsion polymerization; then generates gold nanoparticles in the nanogel by in-situ reduction method; finally, the composite nanogel is fixed on the cotton fabric to form a composite nanogel layer on the surface of the cotton fabric; through the temperature sensitivity of the nanogel and the local plasmonic enhancement effect between the gold nanoparticles, the fabric comfort can be adjusted according to the temperature and light conditions of the external environment, and the present application is suitable for outdoor sports in daily life.

Description

Technical Field

[0001] This invention relates to the field of textile materials, and in particular to a method for automatically adjusting the comfort of fabrics by means of localized plasma enhancement effect. Background Technology

[0002] Smart textiles integrate technologies such as materials science, biology, chemistry, and electronics into textiles, enabling them to sense, respond to, regulate, or adapt to different stimuli. Among the many functions of smart textiles, the comfort of wearing textiles, as a crucial aspect of fabric performance, is closely related to people's daily lives and work. Therefore, smart textiles with comfort regulation capabilities have become a current research hotspot.

[0003] Since textile comfort is positively correlated with breathability / moisture permeability, there are two main methods to regulate textile comfort. One method is to modify the fibers, such as adding phase change materials during spinning to prepare comfort-intelligently regulated fibers. The main phase change materials include paraffin hydrocarbons, polyethers, and polyphenolic ethers. The other method is to introduce temperature-sensitive polymers into textiles to prepare comfort-intelligently regulated textiles. The main temperature-sensitive materials include polyacrylamide and polyethylene oxide acrylates. Previous studies have reported that by compounding acrylate monomers with different transition temperatures, the particle size of the prepared microgels linearly shrinks with increasing temperature. Therefore, cross-linking and fixing these microgels onto the fabric surface can achieve a linear increase in fabric moisture permeability with increasing temperature, thus enabling linear regulation of comfort.

[0004] However, both simple phase change temperature-controlled materials and temperature-sensitive polymers share a common drawback: both phase transitions and volume changes only respond to temperature. Therefore, if the ambient temperature is lower than the phase transition temperature, the comfort level of the textile cannot be regulated. This greatly limits the application of temperature-controlled textiles they produce, and the results are not ideal. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for automatically adjusting the comfort level of fabrics by leveraging localized plasma enhancement effects. The invention first prepares a temperature-sensitive nanogel via emulsion polymerization; then, gold nanoparticles are generated within the nanogel using an in-situ reduction method; finally, the composite nanogel is fixed onto cotton fabric, forming a composite nanogel layer on the fabric surface. Through the temperature sensitivity of the nanogel and the localized plasma enhancement effect between the gold nanoparticles, the comfort level of the fabric can be adjusted according to the temperature and light conditions of the external environment, making it suitable for everyday outdoor activities.

[0006] The specific technical solution of this invention is as follows: a method for improving the automatic adjustment capability of fabric comfort by means of localized plasma enhancement effect, comprising the following steps:

[0007] (1) Preparation of nanogels: 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester, polyethylene glycol methyl ether methacrylate, poly(ethylene glycol) methacrylate, surfactant and crosslinking agent A were dissolved in water. An initiator was added under an inert atmosphere to carry out a polymerization reaction. After the reaction was completed, the nanogels were cooled and centrifuged to obtain nanogels with a diameter of 800-900 nm.

[0008] (2) Preparation of composite nanogel: Add nanogel to gold source solution, stir evenly, add reducing agent dropwise to carry out reduction reaction, generate AuNPs in situ in nanogel and achieve loading, remove excess AuNPs by centrifugation to obtain composite nanogel solution.

[0009] (3) Add esterification reaction catalyst and crosslinking agent B to the composite nanogel solution, immerse cotton fabric, take it out, dry it, and cure it to obtain a fabric with automatic comfort regulation capability.

[0010] In step (1), the present invention first prepares a thermosensitive nanogel through emulsion polymerization, that is, its particle size and volume can shrink linearly with increasing temperature: when the temperature is below its phase transition temperature, the nanogel particle size increases; conversely, when the temperature is above its phase transition temperature, the nanogel particle size decreases. The present invention preferably uses a nanogel particle size of 800-900 nm. If the nanogel particle size is too small, its particle size and volume shrinkage is not obvious; if the nanogel particle size is too large, the distance between particles is too large, and the plasma enhancement effect between gold nanoparticles (AuNPs) cannot be fully utilized.

[0011] In step (2), the present invention generates gold nanoparticles (AuNPs) within the nanogel via an in-situ reduction method. These gold nanoparticles exhibit localized plasmon resonance, thus enabling the composite nanogel to possess both thermosensitive and photosensitivity properties; that is, its particle size and volume linearly shrink with increasing light intensity. More importantly, the present invention uses in-situ reduction process control to ensure that the gold nanoparticles are packed onto the nanogel with an appropriate density. The present invention has discovered that this specific packing density enables the gold nanoparticles to generate a strong localized plasmon enhancement effect, thereby significantly improving photothermal conversion efficiency. Specifically, the present invention controls the particle size and number of Au NPs within the nanogel particles by adjusting the concentration of the gold source solution. If the gold source solution concentration is too low, the AuNPs will have a small particle size and too few particles, resulting in a weak localized plasmon enhancement effect. If the gold source solution concentration is too high, the AuNPs will have a large particle size and too many particles, and the electrostatic interaction between the gold nanoparticles and the cross-linking network of the nanogel will affect the particle size of the nanogel. In addition, the concentration of the reducing agent and the reaction temperature also have an impact. Increasing the concentration of the reducing agent can make Au NPs form faster, increase the chance of aggregation, and increase the particle size; if the reaction temperature is too low, most of the Au NPs will be located outside the nanogel, and if the temperature is too high, it will cause the nanogel to shrink and inhibit the growth of Au NPs.

[0012] In step (3), the present invention immerses cotton fabric in a solution containing composite nanogel, initiator, and crosslinking agent B. During this process, the inherent hydroxyl groups in the composite nanogel system react with the carboxyl groups in the crosslinking agent B under high temperature conditions to form ester bonds. At the same time, the hydroxyl groups on the cotton fabric can also react with the carboxyl groups on the crosslinking agent B to form ester bonds, thereby crosslinking the composite nanogel onto the cotton fabric, that is, forming a composite nanogel layer on the surface of the cotton fabric. While maintaining the inherent performance of the fabric, the moisture permeability of the fabric can be improved under multiple environmental factors (such as temperature and light) through the thermosensitivity of the nanogel and the localized plasma enhancement effect between the closely packed Au NPs. The specific mechanism is as follows: the composite nanogel has a larger particle size under low temperature (below the phase transition temperature) or low light intensity conditions, which can fill the gaps in the cotton fabric, thereby achieving a better warmth retention effect; when under high temperature (above the phase transition temperature) or high light intensity conditions, the particle size of the composite nanogel shrinks linearly, which increases the gaps between the cotton fabric fibers, enhances the moisture permeability / breathability, and thus improves the comfort of the fabric.

[0013] Preferably, in step (1), the surfactant is hexadecyl ammonium bromide or sodium dodecyl sulfate; the crosslinking agent A is N,N'-methylenebisacrylamide; the initiator is an aqueous solution of potassium persulfate; and the inert atmosphere is N2.

[0014] Preferably, in step (1), the ratio of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester, polyethylene glycol methyl ether methacrylate, poly(ethylene glycol) methacrylate, and water is 8-12 mmol:8-12 mmol:1 mmol:(100-200) mL; the amount of surfactant is 0.02-0.06 mmol; the amount of crosslinking agent is 0.05-0.1 g; and the concentration of initiator is 0.005-0.01 g / mL.

[0015] Preferably, in step (1), the polymerization reaction is carried out at a temperature of 70-90°C for 5-6 hours.

[0016] Preferably, in step (2), the ratio of the amount of gold source solution, nanogel and reducing agent is 40-50mL:40-50mg:1-2mL; the gold source solution is an aqueous solution of HAuCl4·3H2O with a concentration of 1-2mg / mL; and the reducing agent is an aqueous solution of NaBH4 with a concentration of 1-2mg / mL.

[0017] Preferably, in step (2), the stirring time is 2-4 hours; the temperature of the reduction reaction is 25-30°C and the time is 1-2 hours.

[0018] Preferably, in step (3), the crosslinking agent B is 1,2,3,4-butanetetracarboxylic acid and / or citric acid; and the esterification reaction catalyst is hypophosphite.

[0019] Preferably, in step (3), the ratio of crosslinking agent B to esterification reaction catalyst in the composite nanogel solution is 120mL:(0.002-0.004):(0.0005-0.001)g / mL.

[0020] Preferably, in step (3), the drying temperature is 60-80℃ and the time is 0.5-1h; the curing temperature is 110-130℃ and the time is 5-10min.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] (1) The present invention first prepares a thermosensitive nanogel by emulsion polymerization; then generates gold nanoparticles in the nanogel by in-situ reduction method; finally fixes the composite nanogel on cotton fabric to form a composite nanogel layer on the surface of cotton fabric; through the thermosensitivity of the nanogel and the local plasma enhancement effect between gold nanoparticles, the comfort of the fabric can be adjusted according to the temperature and light conditions of the external environment, making it suitable for outdoor sports in daily life.

[0023] (2) Compared with conventional loading methods, the present invention, through in-situ reduction process control, enables gold nanoparticles to be stacked on nanogels with appropriate density. The present invention has found that this specific stacking density enables the gold nanoparticles to generate a strong localized plasma enhancement effect, thereby greatly improving the photothermal conversion efficiency. Attached Figure Description

[0024] Figure 1 The graph shows the changes in the moisture permeability of the cross-linked nanogel cotton fabrics with different weight gain rates prepared in Examples 1-3 of this invention; (Strikethrough: weight gain rate of 15%; Dotted line: weight gain rate of 8%; Dashed line: weight gain rate of 4%; Solid line: cotton fabric).

[0025] Figure 2 SEM images of the surface of cotton fabrics crosslinked with composite nanogels with different weight gain rates prepared in Examples 1-3 of this invention; (a: cotton fabric; b: weight gain rate of 4%; c: weight gain rate of 8%; d: weight gain rate of 15%).

[0026] Figure 3 TEM images of the nanogel prepared in Comparative Example 1, the composite nanogel prepared in Comparative Example 2, and Examples 1-3 of the present invention; (a: nanogel prepared in Comparative Example 1; b: composite nanogel prepared in Comparative Example 2; c: composite nanogel prepared in Examples 1-3);

[0027] Figure 4 The graph shows the changes in the moisture permeability of the composite nanogels, nanogel cotton fabrics, and cotton fabrics prepared with the same weight gain rate (15%) in Examples 3, Comparative Examples 1, and Comparative Examples 2 of this invention; (Strikethrough: Example 3; Dotted line: Comparative Example 2; Dashed dotted line: Comparative Example 1; Solid line: Cotton fabric). Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments.

[0029] Example 1

[0030] (1) In a round-bottom flask equipped with an electric stirrer, an inert gas inlet, and a spherical condenser, thoroughly dissolve 1847 μL (10 mmol) of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester (MEO2MA) and 2866 μL (10 mmol) of polyethylene glycol methyl ether methacrylate (OEGMA) in deionized water. 300After adding 325 μL (1 mmol) of poly(ethylene glycol) methacrylate (EGMA), 0.0146 g (0.04 mmol) of hexadecyltrimethylammonium bromide (CTAB), and 0.0925 g of N,N'-methylenebisacrylamide (MBA), N2 was introduced to purge the air remaining in the reaction apparatus and reaction solution. The round-bottom flask was placed in a 70°C oil bath, and 2 mL (0.0054 g / mL) of potassium persulfate (KPS) aqueous solution was added while stirring. The reaction continued under the protection of N2. After the reaction was completed, the nanogels of 800-900 nm were obtained by natural cooling and centrifugation.

[0031] (2) Preparation of composite nanogel: Add nanogel (40mg) to 40mL of deionized water solution of HAuCl4·3H2O (4mg), stir and then add 1mL of NaBH4 (2mg / mL) solution to the reaction mixture. After the reaction, centrifuge to remove excess gold nanoparticles.

[0032] (3) Add 0.105g sodium hypochlorite (SHP) and 0.562g 1,2,3,4-butanetetracarboxylic acid (BTCA) to (120mL) composite nanogel solution. First, dry the cotton fabric in an 80℃ oven for 1 hour and weigh it. Then, soak the cotton fabric in the composite nanogel solution and dry it in an 80℃ oven. Repeat this operation until the weight gain of the fabric reaches 4%. Finally, cure it in a 130℃ oven for 5 minutes.

[0033] Example 2

[0034] (1) In a round-bottom flask equipped with an electric stirrer, an inert gas inlet, and a spherical condenser, thoroughly dissolve 1847 μL (10 mmol) of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester (MEO2MA) and 2866 μL (10 mmol) of polyethylene glycol methyl ether methacrylate (OEGMA) in deionized water. 300 After adding 325 μL (1 mmol) of poly(ethylene glycol) methacrylate (EGMA), 0.0146 g (0.04 mmol) of hexadecyltrimethylammonium bromide (CTAB), and 0.0925 g of N,N'-methylenebisacrylamide (MBA), N2 was introduced to purge the air remaining in the reaction apparatus and reaction solution. The round-bottom flask was placed in a 70°C oil bath, and 2 mL (0.0054 g / mL) of potassium persulfate (KPS) aqueous solution was added while stirring. The reaction continued under the protection of N2. After the reaction was completed, the nanogels of 800-900 nm were obtained by natural cooling and centrifugation.

[0035] (2) Preparation of composite nanogel: Add nanogel (40mg) to 40mL of deionized water solution containing HAuCl4·3H2O (4mg), stir, and then add 1mL of NaBH4 (2mg / mL) solution to the reaction mixture. After the reaction, centrifuge to remove excess Au NPs.

[0036] (3) Add 0.105g sodium hypochlorite (SHP) and 0.562g 1,2,3,4-butanetetracarboxylic acid (BTCA) to (120mL) composite nanogel solution. First, dry the cotton fabric in an 80℃ oven for 1 hour and weigh it. Then, soak the cotton fabric in the composite nanogel solution and dry it in an 80℃ oven. Repeat this operation until the weight gain of the fabric reaches 8%. Finally, cure it in a 130℃ oven for 5 minutes.

[0037] Example 3

[0038] (1) In a round-bottom flask equipped with an electric stirrer, an inert gas inlet, and a spherical condenser, thoroughly dissolve 1847 μL (10 mmol) of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester (MEO2MA) and 2866 μL (10 mmol) of polyethylene glycol methyl ether methacrylate (OEGMA) in deionized water. 300 After adding 325 μL (1 mmol) of poly(ethylene glycol) methacrylate (EGMA), 0.0146 g (0.04 mmol) of hexadecyltrimethylammonium bromide (CTAB), and 0.0925 g of N,N'-methylenebisacrylamide (MBA), N2 was introduced to purge the air remaining in the reaction apparatus and reaction solution. The round-bottom flask was placed in a 70°C oil bath, and 2 mL (0.0054 g / mL) of potassium persulfate (KPS) aqueous solution was added while stirring. The reaction continued under the protection of N2. After the reaction was completed, the nanogels of 800-900 nm were obtained by natural cooling and centrifugation.

[0039] (2) Preparation of composite nanogel: Add nanogel (40mg) to 40mL of deionized water solution of HAuCl4·3H2O (4mg), stir and then add 1mL of NaBH4 (2mg / mL) solution to the reaction mixture. After the reaction, centrifuge to remove excess gold nanoparticles.

[0040] (3) Add 0.105g sodium hypochlorite (SHP) and 0.562g 1,2,3,4-butanetetracarboxylic acid (BTCA) to (120mL) composite nanogel solution. First, dry the cotton fabric in an 80℃ oven for 1 hour and weigh it. Then, soak the cotton fabric in the composite nanogel solution and dry it in an 80℃ oven. Repeat this operation until the weight gain of the fabric reaches 15%. Finally, cure it in a 130℃ oven for 5 minutes.

[0041] Comparative Example 1

[0042] (1) In a round-bottom flask equipped with an electric stirrer, an inert gas inlet, and a spherical condenser, thoroughly dissolve 1847 μL (10 mmol) of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester (MEO2MA) and 2866 μL (10 mmol) of polyethylene glycol methyl ether methacrylate (OEGMA) in deionized water. 300 After adding 325 μL (1 mmol) of poly(ethylene glycol) methacrylate (EGMA), 0.0146 g (0.04 mmol) of hexadecyltrimethylammonium bromide (CTAB), and 0.0925 g of N,N'-methylenebisacrylamide (MBA), N2 was introduced to purge the air remaining in the reaction apparatus and reaction solution. The round-bottom flask was placed in a 70°C oil bath, and 2 mL (0.0054 g / mL) of potassium persulfate (KPS) aqueous solution was added while stirring. The reaction continued under the protection of N2. After the reaction was completed, the nanogels of 800-900 nm were obtained by natural cooling and centrifugation.

[0043] (2) Add 0.105g sodium hypochlorite (SHP) and 0.562g 1,2,3,4-butanetetracarboxylic acid (BTCA) to (120mL) nanogel solution. First, dry the cotton fabric in an 80℃ oven for 1h and weigh it. Then, soak the cotton fabric in the composite nanogel solution and dry it in an 80℃ oven. Repeat this operation until the weight gain of the fabric reaches 15%. Finally, cure it in a 130℃ oven for 5min.

[0044] Comparative Example 2

[0045] (1) In a round-bottom flask equipped with an electric stirrer, an inert gas inlet, and a spherical condenser, thoroughly dissolve 1847 μL (10 mmol) of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester (MEO2MA) and 2866 μL (10 mmol) of polyethylene glycol methyl ether methacrylate (OEGMA) in deionized water. 300 After adding 325 μL (1 mmol) of poly(ethylene glycol) methacrylate (EGMA), 0.0146 g (0.04 mmol) of hexadecyltrimethylammonium bromide (CTAB), and 0.0925 g of N,N'-methylenebisacrylamide (MBA), N2 was introduced to purge the air remaining in the reaction apparatus and reaction solution. The round-bottom flask was placed in a 70°C oil bath, and 2 mL (0.0054 g / mL) of potassium persulfate (KPS) aqueous solution was added while stirring. The reaction continued under the protection of N2. After the reaction was completed, the nanogels of 800-900 nm were obtained by natural cooling and centrifugation.

[0046] (2) Preparation of composite nanogel: 40 mg of nanogel was added to a 0.4 mg solution of HAuCl4·3H2O dissolved in 40 mL of deionized water. After stirring, 1 mL of NaBH4 (2 mg / mL) solution was added dropwise to the reaction mixture. After the reaction, the excess gold nanoparticles were removed by centrifugation.

[0047] (3) Add 0.105g sodium hypochlorite (SHP) and 0.562g 1,2,3,4-butanetetracarboxylic acid (BTCA) to (120mL) composite nanogel solution. First, dry the cotton fabric in an 80℃ oven for 1 hour and weigh it. Then, soak the cotton fabric in the composite nanogel solution and dry it in an 80℃ oven. Repeat this operation until the weight gain of the fabric reaches 15%. Finally, cure it in a 130℃ oven for 5 minutes.

[0048] Performance testing

[0049] (1) The moisture permeability of the cross-linked cotton fabrics prepared in Examples 1-3 was determined according to the standard procedure (GB / T 12704.2-2009). Before measurement, 34 mL of deionized water was filled into the moisture permeability cup. After covering with the (pure nanogel) composite nanogel cross-linked cotton fabric, the cup was placed under constant temperature, constant humidity, and constant visible light irradiation (relative humidity 50%, temperature 20℃, light intensity 327.7 Wm). -2 The cup was placed in a constant temperature and humidity chamber. After equilibration for 1 hour, the cup and the cross-linked nanogel-coated cotton fabric were weighed together. The cup was then returned to the room for one hour. After that, it was weighed again. The above operation was repeated by changing the temperature and humidity chamber (30, 35, 40, 45, and 50°C). The water vapor permeation of the composite nanogel-coated cotton fabric can be calculated by water loss. Figure 1 When the weight gain rate is 4%, the WVT of the fabric can be obtained. T / WVT 20 It rises to 1.26 at 30℃, and as the temperature increases, it is slightly higher than the WVT of cotton fabric. T / WVT 20 This indicates that the linear shrinkage of the composite nanogel at high temperatures can improve the moisture permeability of the fabric compared to that at low temperatures. As the weight gain increases to 8%, the WVT of the fabric... T / WVT 20 It rises to 1.67 at 30°C, which is higher than the WVT of cotton fabric. T / WVT 20 (1.08) is 55% higher than the WVT of composite nanogel fabric with a weight gain of 4%. T / WVT 20The moisture permeability is 32% higher. This significant enhancement in moisture permeability is attributed to the LSPR effect induced by visible light irradiation. Au NPs embedded in the composite nanogel can absorb visible light and convert it into heat through photothermal conversion. Furthermore, due to the dense arrangement of the composite nanogel on the fabric, the localized plasmon resonance enhancement effect between the Au NPs in the composite nanogel greatly improves the photothermal conversion efficiency. Therefore, moisture permeability can be significantly improved through dual stimulation by heat and light. Increasing the weight gain of the composite nanogel to 15% resulted in a significantly higher WVT at 30°C. T / WVT 20 Reaching 2.18, almost twice that of the original cotton fabric, and higher than the WVT of the composite nanogel fabric with an 8% weight gain. T / WVT 20 30% higher. As temperature increases, WVT at 50°C... T / WVT 20 The value can reach 7.38. This means that under the combined effects of high temperature and light, the localized plasma enhancement effect of Au NPs is beneficial to improving moisture permeability and enhancing the fabric's comfort regulation capability. At the same weight gain rate of 15% ( Figure 4 The WVT of the fabric in Example 3 at 30°C T / WVT 20 The WVT reached 2.18, while the WVT of the cross-linked nanogel (Comparative Example 1) and the composite nanogel containing only a small amount of Au NPs (Comparative Example 2) was significantly lower. T / WVT 20 The values ​​were only 1.40 and 1.54; compared to cotton fabrics with cross-linked nanogels, their moisture permeability was not significantly enhanced. This indicates that when the number of Au NPs is too small, the LSPR effect is weak, and there is almost no localized plasmon enhancement effect between Au NPs, resulting in limited photothermal conversion efficiency.

[0050] (2) Figure 2 SEM images of cotton fabrics and cross-linked cotton fabrics prepared in Examples 1-3, as shown below. Figure 2 As shown, the cotton fabric surface is smooth; when the weight gain rate is 4%, the polymer layer on the fabric surface is thin; as the weight gain rate increases, a thicker polymer layer can be observed on the fabric surface.

[0051] (3) Figure 3 TEM images of the nanogel prepared in Comparative Example 1, and the composite nanogels prepared in Comparative Example 2 and Examples 1-3 of this invention. Figure 3 As shown, the pure nanogel exhibits a uniform structure, while the composite nanogel contains tiny AuNPs. The number of AuNPs within the nanogel varies depending on the concentration of the gold source solution.

[0052] (4) An infrared drying lamp was selected, and the distance between the infrared lamp and the infrared power meter was kept at 15 cm. Without any obstruction, cotton fabrics cross-linked with pure nanogel and composite nanogel were placed between the infrared light source and the power meter, and the infrared power was measured. Thus, the infrared shielding value of the cotton fabric cross-linked with composite nanogel and the cotton fabric were obtained. As shown in Table 1, the infrared shielding rate of the original cotton fabric was only 60.3%. However, the shielding rate of the cotton fabric cross-linked with composite nanogel containing Au NPs increased to 81.9% even with a weight gain of 4%, which is more than 36% higher than that of the cotton fabric. This is related to the photothermal conversion ability of Au NPs in the composite nanogel. Au NPs can absorb incident light through the plasma resonance effect, thereby improving the shielding performance of the fabric. With the increase of weight gain, the shielding rate of the fabric further increased to 85.1% and 87.2%. However, since the incident light is not entirely the specific wavelength that Au NPs can absorb, the shielding performance of the fabric did not improve significantly even if the weight gain was doubled.

[0053] Table 1

[0054]

[0055] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for improving the automatic adjustment capability of fabric comfort by utilizing localized plasma enhancement effect, characterized in that... Includes the following steps: (1) Preparation of nanogels: 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester, polyethylene glycol methyl ether methacrylate, poly(ethylene glycol) methacrylate, surfactant and crosslinking agent A were dissolved in water. An initiator was added under an inert atmosphere to carry out a polymerization reaction. After the reaction was completed, the nanogels were cooled and centrifuged to obtain 800-900 nm nanogels. (2) Preparation of composite nanogel: Add nanogel to gold source solution, stir evenly and then add reducing agent dropwise to carry out reduction reaction, Au NPs are generated in situ in nanogel and loaded, and excess Au NPs are removed by centrifugation to obtain composite nanogel solution; The ratio of the gold source solution, nanogel, and reducing agent is 40-50 mL: 40-50 mg: 1-2 mL; The gold source solution is an aqueous solution of HAuCl4·3H2O with a concentration of 1-2 mg / mL; The reducing agent is an aqueous solution of NaBH4 with a concentration of 1-2 mg / mL; The reduction reaction is carried out at a temperature of 25-30 °C for 1-2 hours. (3) Add esterification reaction catalyst and crosslinking agent B to the composite nanogel solution, immerse cotton fabric, take it out, dry it, and cure it to obtain a fabric with automatic comfort regulation capability.

2. The method as described in claim 1, characterized in that: In step (1), The surfactant is hexadecyl ammonium bromide or sodium dodecyl sulfate; The crosslinking agent A is N,N'-methylenebisacrylamide; The initiator is an aqueous solution of potassium persulfate; The inert atmosphere is N2.

3. The method as described in claim 2, characterized in that: In step (1), The ratio of 2-methyl-2-acrylate-2-(2-methoxyethoxy)ethyl ester, polyethylene glycol methyl ether methacrylate, poly(ethylene glycol) methacrylate and water is 8-12 mmol:8-12 mmol:1 mmol:(100-200) mL; The amount of the surfactant is 0.02-0.06 mmol; the amount of the crosslinking agent is 0.05-0.1 g; and the concentration of the initiator is 0.005-0.01 g / mL.

4. The method as described in claim 1, characterized in that: In step (1), the polymerization reaction is carried out at a temperature of 70-90 °C for 5-6 h.

5. The method as described in claim 1, characterized in that: In step (2), the stirring time is 2-4 hours.

6. The method as described in claim 1, characterized in that: In step (3), The crosslinking agent B is 1,2,3,4-butanetetracarboxylic acid and / or citric acid; The catalyst for the esterification reaction is hypophosphite.

7. The method as described in claim 6, characterized in that: In step (3), the ratio of crosslinking agent B to esterification reaction catalyst in the composite nanogel solution is 120 mL: (0.002-0.004): (0.0005-0.001) g / mL.

8. The method as described in claim 1, characterized in that: In step (3), The drying temperature is 60-80 °C, and the time is 0.5-1 h; The curing temperature is 110-130 °C and the time is 5-10 min.

Images