Preparation method of antibacterial deodorizing chinlon

Abstract

The preparation method comprises the following steps: dissolving phosphorus pentachloride in an n-hexane solvent, and preparing a phosphorus pentachloride solution with the concentration of 20 to 50 mmol / L; immersing the original chinlon in a phosphorus pentachloride solution for activation reaction to obtain activated chinlon; taking out the activated chinlon and removing the residual phosphorus pentachloride solution on the surface; the cleaned chinlon is immersed in a hyperbranched polylysine solution with the concentration of 15-30 wt% for a grafting reaction, and grafted chinlon is obtained; taking out the grafted chinlon, and removing residual substances on the surface of the grafted chinlon; and drying the washed chinlon to obtain the modified chinlon. According to the modified chinlon, a phosphorus pentachloride activation-hyperbranched polylysine grafting two-step method is adopted, the mechanical property of the chinlon is effectively protected while the efficient antibacterial and deodorizing functions are achieved, the antibacterial and deodorizing effect has good durability, and therefore the problems that in the prior art, modified chinlon is poor in antibacterial durability, large in fiber damage and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of functional modification of textile materials, specifically to a method for preparing antibacterial and deodorizing nylon. Background Technology

[0002] Nylon, due to its excellent mechanical properties, abrasion resistance, and elasticity, is widely used in clothing, home textiles, and industrial textiles. However, because nylon has poor moisture absorption, it is prone to bacterial growth and odor during use, which not only affects wearing comfort but may also pose a potential threat to human health. Therefore, modifying nylon to have antibacterial and deodorizing functions has become one of the research hotspots in the textile industry.

[0003] Currently, the main methods for antibacterial modification of nylon include coating, blending spinning, and chemical grafting. Coating involves attaching antibacterial agents to the nylon surface through a coating process. This method is simple to operate, but the antibacterial agent has weak bonding with the fiber and is easily detached during washing, resulting in poor antibacterial durability. Blending spinning involves adding the antibacterial agent to the spinning melt before nylon spinning to produce antibacterial nylon fibers. This method can achieve uniform distribution of the antibacterial agent, but the addition of the antibacterial agent may affect the stability of the spinning process and have a certain negative impact on the mechanical properties of the fiber. Chemical grafting involves grafting antibacterial molecules onto the surface of nylon fibers through a chemical reaction, forming a strong chemical bond. This method offers excellent antibacterial durability and is one of the current mainstream modification methods.

[0004] In chemical grafting, commonly used antibacterial molecules include quaternary ammonium salts, guanidines, and natural antibacterial agents. Among them, hyperbranched polylysine (HPL) has advantages such as broad-spectrum antibacterial activity, high safety, and non-irritation. Moreover, HPL has cationic properties and can carry a positive charge in the physiological environment. It mainly binds to negatively charged components on the bacterial surface through electrostatic interactions, thereby disrupting the integrity of the bacterial cell membrane. Although the HPL molecule contains a large number of amino groups, the high crystallinity and smooth surface of nylon make it difficult for HPL to bind to the reactive sites on the nylon fiber surface. Specific activation methods are needed to improve the reactivity of the nylon surface. In existing technologies, commonly used activators include acid anhydrides and isocyanates, but they suffer from low activation efficiency, significant fiber damage, or poor environmental friendliness. Therefore, developing an efficient, low-damage, and environmentally friendly nylon activation-antibacterial grafting process is of great significance for the preparation of high-performance antibacterial and deodorizing nylon. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for preparing antibacterial and deodorizing nylon, which enables the nylon to have good antibacterial and deodorizing functions and mechanical properties, and the antibacterial and deodorizing effect has good durability, thereby overcoming the problems of poor antibacterial durability and large fiber damage in modified nylon in the prior art.

[0006] A method for preparing antibacterial and deodorizing nylon according to an embodiment of the present invention includes the following steps: Dissolve phosphorus pentachloride in n-hexane to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; The raw nylon was immersed in the phosphorus pentachloride solution to carry out an activation reaction, resulting in activated nylon; The activated nylon was removed and the residual phosphorus pentachloride solution on the surface was removed to obtain the cleaned nylon; The cleaned nylon was immersed in a 15-30 wt% hyperbranched polylysine solution for grafting reaction to obtain grafted nylon. The grafted nylon was removed and the surface residue was removed to obtain washed nylon. The washed nylon is dried to obtain modified nylon.

[0007] A method for preparing antibacterial and deodorizing nylon according to an embodiment of the present invention has at least the following beneficial effects: [The following text appears to be incomplete and requires further context: "phosphorus pentachloride solution in..."] Nucleophilic reactions occur with the amide bonds on the nylon molecular chain, introducing acyl chloride groups (-COCl) onto the fiber surface, which enhances the reactivity of the nylon surface. During the grafting reaction, the acyl chloride groups (-COCl) on the cleaned nylon surface undergo a condensation reaction with the amino groups (-NH2) in the HPL molecules to form amide bonds (-CONH-), thus firmly grafting the HPL molecules onto the nylon fiber surface. Therefore, modified nylon, through a two-step method of phosphorus pentachloride activation and hyperbranched polylysine grafting, achieves highly efficient antibacterial and deodorizing functions while effectively protecting the mechanical properties of nylon. Furthermore, the antibacterial and deodorizing effects exhibit good durability, overcoming the problems of poor antibacterial durability and significant fiber damage found in existing modified nylon technologies.

[0008] According to some embodiments of the present invention, the bath ratio of the raw nylon to the phosphorus pentachloride solution is 1:30.

[0009] According to some embodiments of the present invention, the raw nylon is activated at room temperature and pressure for a period of 10-40 min.

[0010] According to some embodiments of the present invention, the activated nylon is removed and the residual phosphorus pentachloride solution on its surface is removed to obtain cleaned nylon, comprising the following steps: removing the activated nylon and removing the residual phosphorus pentachloride solution on the surface of the activated nylon using n-hexane solvent to obtain cleaned nylon.

[0011] According to some embodiments of the present invention, the bath ratio of the washed nylon to the hyperbranched polylysine solution is 1:30.

[0012] According to some embodiments of the present invention, the washed nylon is immersed in a hyperbranched polylysine solution with a concentration of 15-30 wt% for grafting reaction to obtain grafted nylon, comprising the following steps: adding triethylamine solution, fatty alcohol polyoxyethylene ether penetrant and the washed nylon to a hyperbranched polylysine solution with a concentration of 15-30 wt%, and the washed nylon undergoes a grafting reaction with the hyperbranched polylysine solution to obtain grafted nylon; wherein the grafting reaction temperature is 80°C and the grafting reaction time is 15-60 min.

[0013] According to some embodiments of the present invention, the concentration of the triethylamine solution is 10 wt%.

[0014] According to some embodiments of the present invention, the amount of the fatty alcohol polyoxyethylene ether penetrant added is 1 wt% of the mass of the hyperbranched polylysine solution.

[0015] According to some embodiments of the present invention, the grafted nylon is removed and surface residues are removed to obtain washed nylon, comprising the following steps: removing the grafted nylon, removing surface residues of the grafted nylon with deionized water to obtain washed nylon; wherein, the washing is performed three times, and the washing time for each wash is 10 minutes.

[0016] According to some embodiments of the present invention, the drying temperature is 50°C and the drying time is 4 hours.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 These are SEM characterization images according to embodiments of the present invention; Figure 2 This is a stress-strain curve diagram according to an embodiment of the present invention; Figure 3This is a hydrophilicity test diagram according to an embodiment of the present invention; Figure 4 This is an antibacterial test diagram according to an embodiment of the present invention. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] In the description of this invention, the use of terms such as first, second, third, fourth, fifth, etc., is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "setup" and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] A method for preparing antibacterial and deodorizing nylon according to an embodiment of the present invention includes: Step S100: Dissolve phosphorus pentachloride in n-hexane solvent to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; Step S200: Immerse the raw nylon in a phosphorus pentachloride solution to carry out an activation reaction, and obtain activated nylon; Step S300: Remove the activated nylon and remove the residual phosphorus pentachloride solution from the surface to obtain the cleaned nylon; Step S400: Immerse the cleaned nylon in a 15-30 wt% hyperbranched polylysine solution to carry out a grafting reaction to obtain grafted nylon; Step S500: Remove the grafted nylon and remove any residual substances from its surface to obtain washed nylon; Step S600: Dry the washed nylon to obtain modified nylon.

[0024] Specifically, in step S100, n-hexane is a colorless, volatile organic liquid with a faint, distinctive odor. It is insoluble in water but readily soluble in organic solvents such as ethanol and diethyl ether. Industrially, n-hexane is mainly used as a solvent, with its core advantages being its excellent dissolving power and high production adaptability. Therefore, dissolving phosphorus pentachloride in n-hexane solvent is beneficial to improving the dissolution rate and efficiency of phosphorus pentachloride preparation. Moreover, n-hexane has a boiling point of approximately 69°C, making it easy to recover and purify, thus facilitating its recycling through vacuum distillation and reducing material waste.

[0025] In step S200, the phosphorus pentachloride solution... Nucleophilic reactions occur with the amide bonds on the nylon molecular chain, introducing acyl chloride groups (-COCl) onto the fiber surface, thereby increasing the reactivity of the nylon surface and laying the foundation for subsequent grafting reactions. In step S300, the residual phosphorus pentachloride solution on the activated nylon surface is removed, thus reducing its impact on subsequent grafting reactions.

[0026] In step S400, the hyperbranched polylysine solution contains HPL molecules, and the HPL molecules have amino groups (-NH2). Therefore, during the grafting reaction, the acyl chloride groups (-COCl) on the cleaned nylon surface undergo a condensation reaction with the amino groups (-NH2) in the HPL molecules to form amide bonds (-CONH-), thereby firmly grafting the HPL molecules onto the nylon fiber surface. In step S500, removing residual substances from the grafted nylon surface helps improve the stability of the nylon.

[0027] In step S600, modified nylon is obtained by drying the washed nylon. The initial antibacterial rates against *Escherichia coli*, *Staphylococcus aureus*, and *Candida albicans* reach 96.1%, 100%, and 95.4%, respectively. After 100 standard washes, the antibacterial rates against *Escherichia coli*, *Staphylococcus aureus*, and *Candida albicans* remain above 81.7%, 100%, and 82.6%, respectively, far exceeding industry standard requirements and solving the problem of poor antibacterial durability in traditional coating methods. Furthermore, the modified nylon exhibits significantly improved deodorization rates against ammonia and acetic acid. After 100 standard washes, the deodorization rates against acetic acid and ammonia are 88.9% and 71.7%, respectively, meeting the requirements of GB / T 33610.1-2019 standard.

[0028] During the activation process, although It will have some impact on the mechanical properties of nylon, but after grafting HPL molecules onto the surface, the mechanical properties of nylon are significantly improved. According to the test, the tensile strength of the modified nylon after 100 standard washes is 10.88 MPa, which is very small compared with the original (11.20 MPa), thus ensuring that the nylon has good antibacterial and deodorizing functions and good performance.

[0029] It can be seen that modified nylon achieves efficient antibacterial and deodorizing functions while effectively protecting the mechanical properties of nylon through a two-step method of phosphorus pentachloride activation and hyperbranched polylysine grafting. The antibacterial and deodorizing effect also has good durability, thus overcoming the problems of poor antibacterial durability and large fiber damage in existing modified nylon technologies.

[0030] In some specific embodiments of the present invention, the bath ratio of the original nylon to the phosphorus pentachloride solution is 1:30.

[0031] Specifically, in this embodiment, the bath ratio refers to the ratio between the mass of the original nylon and the volume of the phosphorus pentachloride solution. By setting the bath ratio to 1:30, it is beneficial for the original nylon to undergo a full activation reaction in the phosphorus pentachloride solution, thereby improving the activation effect.

[0032] In some specific embodiments of the present invention, the original nylon is activated at room temperature and pressure for 10-40 min.

[0033] Specifically, by setting the temperature, pressure, and time of the activation reaction, the raw nylon can undergo a full activation reaction in the phosphorus pentachloride solution, which helps to improve the effect of the activation reaction.

[0034] In some specific embodiments of the present invention, the activated nylon is removed and the residual phosphorus pentachloride solution on the surface is removed to obtain cleaned nylon, including the following steps: the activated nylon is removed and the residual phosphorus pentachloride solution on the surface of the activated nylon is removed using n-hexane solvent to obtain cleaned nylon.

[0035] Specifically, since there is no chemical reaction between the hexane solvent and the activated nylon, and the phosphorus pentachloride solution is soluble in the hexane solvent, the hexane solvent can be used to remove the residual phosphorus pentachloride solution on the surface of the activated nylon, thereby preventing the phosphorus pentachloride solution from having an adverse effect on the subsequent grafting reaction.

[0036] In some specific embodiments of the present invention, the bath ratio of the washed nylon to the hyperbranched polylysine solution is 1:30.

[0037] Specifically, in this embodiment, the bath ratio refers to the ratio between the mass of the washed nylon and the volume of the hyperbranched polylysine solution. By setting the bath ratio to 1:30, it is beneficial for the washed nylon to undergo a full grafting reaction in the hyperbranched polylysine solution, thereby improving the grafting effect.

[0038] In some specific embodiments of the present invention, the washed nylon is immersed in a hyperbranched polylysine solution with a concentration of 15-30 wt% for grafting reaction to obtain grafted nylon, including the following steps: adding triethylamine solution, fatty alcohol polyoxyethylene ether penetrant and washed nylon to a hyperbranched polylysine solution with a concentration of 15-30 wt%, and performing a grafting reaction between the washed nylon and the hyperbranched polylysine solution to obtain grafted nylon; wherein, the grafting reaction temperature is 80°C and the grafting reaction time is 15-60 min.

[0039] Specifically, during the grafting reaction between the washed nylon and the hyperbranched polylysine solution, hydrogen chloride is generated. Therefore, triethylamine solution, acting as an acid-binding agent, neutralizes the hydrogen chloride produced during the grafting reaction, thus preventing excessive hydrolysis of the acyl chloride groups on the nylon surface. This effectively protects the nylon fiber structure and prevents a decrease in its strength. Meanwhile, fatty alcohol polyoxyethylene ether penetrants promote the uniform penetration of the hyperbranched polylysine solution into the nylon fiber, ensuring a uniform grafting reaction and improving functional uniformity.

[0040] By setting the temperature and time of the grafting reaction, the nylon can undergo a full grafting reaction in the hyperbranched polylysine solution, which is beneficial to improving the grafting effect.

[0041] In some specific embodiments of the present invention, the concentration of the triethylamine solution is 10 wt%.

[0042] Specifically, by setting the concentration of the triethylamine solution to fully neutralize the hydrogen chloride generated during the grafting reaction, the fiber structure of the nylon is effectively protected, preventing a decrease in its strength.

[0043] In some specific embodiments of the present invention, the amount of fatty alcohol polyoxyethylene ether penetrant added is 1 wt% of the mass of the hyperbranched polylysine solution.

[0044] Specifically, by adjusting the amount of fatty alcohol polyoxyethylene ether penetrant added, the hyperbranched polylysine solution is ensured to fully and uniformly penetrate into the nylon fiber, ensuring a uniform grafting reaction and improving functional uniformity.

[0045] In some specific embodiments of the present invention, the grafted nylon is removed and the surface residue is removed to obtain washed nylon, including the following steps: the grafted nylon is removed, and the surface residue of the grafted nylon is removed using deionized water to obtain washed nylon; wherein, the washing is performed three times, and the washing time for each time is 10 minutes.

[0046] Specifically, deionized water is purified water that has undergone special treatment to remove most ions (such as calcium, magnesium, and sodium). It has extremely low conductivity (typically ≤10 μS / cm) and a near-neutral pH (6.0-7.5). Therefore, using deionized water does not introduce new impurities, making it an ideal choice for cleaning grafted nylon. This effectively removes ungrafted HPL and residual substances such as triethylamine hydrochloride from the neutralization reaction from the grafted nylon surface. Furthermore, by setting the number of washes and the washing time, the washing effect of the grafted nylon can be improved, ensuring that residual substances are removed.

[0047] In some specific embodiments of the present invention, the drying temperature is 50°C and the drying time is 4 hours.

[0048] Specifically, the stability of modified nylon can be improved by setting the drying temperature and time.

[0049] Other components and operations of the preparation method of antibacterial and deodorizing nylon according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0050] Specifically, the preparation method of antibacterial and deodorizing nylon according to an embodiment of the present invention is described in detail with reference to a specific example. It is worth understanding that the following description is merely illustrative and not a specific limitation of the invention.

[0051] A method for preparing antibacterial and deodorizing nylon includes the following steps: Step S100: Dissolve phosphorus pentachloride in n-hexane solvent to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; Step S200: Immerse the raw nylon in a phosphorus pentachloride solution to carry out an activation reaction to obtain activated nylon; wherein, the bath ratio of the raw nylon to the phosphorus pentachloride solution is 1:30, and the activation reaction is carried out at room temperature and pressure for 10-40 min. Step S300: Take out the activated nylon and use n-hexane solvent to remove the residual phosphorus pentachloride solution on the surface of the activated nylon to obtain the cleaned nylon; Step S400: A 10 wt% triethylamine solution, a fatty alcohol polyoxyethylene ether penetrant, and the washed nylon are added to a 15-30 wt% hyperbranched polylysine solution. The washed nylon is then subjected to a grafting reaction with the hyperbranched polylysine solution to obtain grafted nylon. The grafting reaction is carried out at 80°C for 15-60 minutes, and the amount of fatty alcohol polyoxyethylene ether penetrant added is 1 wt% of the mass of the hyperbranched polylysine solution. Step S500: Take out the grafted nylon and use deionized water to remove the surface residue of the grafted nylon to obtain washed nylon; wherein, the washing is performed three times and the washing time is 10 minutes each time. Step S600: Dry the washed nylon to obtain modified nylon; wherein the drying temperature is 50℃ and the drying time is 4 hours.

[0052] According to an embodiment of the present invention, a method for preparing antibacterial and deodorizing nylon can achieve at least the following effects: the modified nylon, through a two-step method of phosphorus pentachloride activation and hyperbranched polylysine grafting, achieves highly efficient antibacterial and deodorizing functions while effectively protecting the mechanical properties of the nylon, and the antibacterial and deodorizing effect has good durability, thereby overcoming the problems of poor antibacterial durability and large fiber damage in the prior art of modified nylon.

[0053] Furthermore, the untreated raw nylon, the modified nylon obtained through steps S100-S600, and the washed nylon after 100 standard washes were characterized by SEM, tested for contact angle, and tested for antibacterial properties (Escherichia coli, Staphylococcus aureus, and Candida albicans), deodorization properties, and mechanical properties. The results are as follows: SEM characterization: such as Figure 1 As shown, (a) represents virgin nylon, (b) represents activated nylon, (c) represents modified nylon, and (d) represents washed nylon. According to the SEM results, the surface of the virgin nylon fiber is smooth and flat; after SEM... After etching and activation, some etched holes appeared on the surface of the activated nylon; after HPL grafting modification, the holes on the surface of the modified nylon fibers basically disappeared, and particulate matter was attached to the surface; after 100 standard washes of the modified nylon, the particulate matter attached to the surface of the washed nylon fibers disappeared, and the fibers basically returned to a smooth and flat state.

[0054] Mechanical properties: Tensile tests were performed on raw nylon, activated nylon, modified nylon, and washed nylon, and the results are listed below. Figure 2 As shown in Table 1, the tensile strength of the original nylon is 11.20 MPa; after... After etching and activation, the activated nylon fibers exhibited increased surface porosity, resulting in a significant decrease in tensile strength to 7.62 MPa. However, after HPL grafting modification, the modified nylon fibers showed a marked reduction in surface porosity, leading to a significant increase in tensile strength to 11.40 MPa. Even after 100 standard washes, the tensile strength of the washed nylon remained at 10.88 MPa. This demonstrates a high degree of consistency between the nylon tensile test results and the SEM results, indicating that the preparation method of the modified nylon in this invention causes almost no damage to the strength of the original nylon. Furthermore, it can be observed that the fracture strain of the modified material is significantly increased, rising from 72% of that of the original nylon to 106% and 113% of that of the modified and washed nylon, respectively, indicating that the preparation method of this embodiment can effectively improve the elasticity of nylon.

[0055] Table 1 Mechanical properties of modified nylon

[0056] Contact angle test: The contact angle test results are listed in Figure 3 In the figures, 0s represents the contact angle at 0 seconds, 20s represents the contact angle at 20 seconds, and the complete wetting time represents the minimum time required for the contact angle to be 0. The results show that the hydrophilicity of nylon is significantly improved after modification. Among them, activated nylon exhibits the best hydrophilicity, with a complete wetting time of 0.6s. The complete wetting times of modified nylon, washed nylon, and virgin nylon are 3.2s, 6.2s, and 28.7s, respectively, indicating that the preparation method of this embodiment can effectively improve the hydrophilicity of nylon.

[0057] Antibacterial properties: Using virgin nylon as a control, the antibacterial properties of modified nylon and washed nylon against three test bacteria—Escherichia coli, Staphylococcus aureus, and Candida albicans—were tested respectively. The results are listed below. Figure 4 See Table 2. The results show that the original nylon exhibited poor antibacterial activity against all three tested bacteria, while the modified nylon showed significantly improved antibacterial activity against all three. The antibacterial activity against Staphylococcus aureus was particularly outstanding. This is because Staphylococcus aureus is a Gram-positive bacterium, lacking an outer membrane barrier in its cell wall and rich in negatively charged teichoic acid, which can efficiently adsorb and allow HPL to penetrate through electrostatic interactions, thus directly disrupting its cell membrane. Escherichia coli, on the other hand, is a Gram-negative bacterium, and its outer membrane and dense structure hinder the action of HPL, resulting in weaker antibacterial activity. The modified nylon achieved antibacterial rates of 96.1%, 100%, and 95.4% against the three tested bacteria, respectively. After 100 standard washes, the washed nylon showed antibacterial rates of 81.7%, 100%, and 82.6% against the three tested bacteria, respectively, reaching the national standard 5A level of antibacterial activity.

[0058] Table 2. Antibacterial test results of modified nylon

[0059] Odor removal performance: Raw nylon, modified nylon, and washed nylon were tested according to GB / T 33610.2-2017 "Deodorization performance of textiles - Part 2: Detection tube method". The tested gases were ammonia and acetic acid. The results are listed in Table 3. The results show that all three samples effectively eliminated the odor of acetic acid, with odor removal rates of 86.3%, 87.3%, and 88.8%, respectively, and all passed the acetic acid deodorization test. The ammonia removal rates of the three samples were 23.2%, 60.1%, and 71.7%, respectively. It is evident that modified nylon significantly improved the ammonia removal rate, and the washed nylon, after 100 standard washes, passed the ammonia deodorization test. The modified nylon showed a significant improvement in the deodorization rate of ammonia because the surface grafting of HPL introduced a large number of carboxyl groups on the fiber surface, which can significantly enhance the adsorption of alkaline gases. The improvement in the deodorization rate of acetic acid was not significant, partly because the original sample itself is rich in amide bonds, which has a high adsorption rate of acetic acid, and partly because the surface grafting of HPL also consumed some free amino groups.

[0060] Table 3. Deodorization test results of modified nylon

[0061] The test results above show that the antibacterial and deodorizing nylon prepared by this invention has excellent antibacterial and deodorizing properties, as well as good mechanical and hydrophilic properties. Moreover, the antibacterial and deodorizing effect is durable and can meet the needs of underwear, sportswear and other fields.

[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," or "this embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for preparing antibacterial and deodorizing nylon, characterized in that, Includes the following steps: Dissolve phosphorus pentachloride in n-hexane to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; The raw nylon was immersed in the phosphorus pentachloride solution to carry out an activation reaction, resulting in activated nylon; The activated nylon was removed and the residual phosphorus pentachloride solution on the surface was removed to obtain the cleaned nylon; The cleaned nylon was immersed in a 15-30 wt% hyperbranched polylysine solution for grafting reaction to obtain grafted nylon. The grafted nylon was removed and the surface residue was removed to obtain washed nylon. The washed nylon is dried to obtain modified nylon.

2. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The ratio of the raw nylon to the phosphorus pentachloride solution is 1:

30.

3. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The raw nylon is activated at room temperature and pressure for 10-40 minutes.

4. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The activated nylon is removed and the residual phosphorus pentachloride solution on its surface is removed to obtain cleaned nylon. The process includes the following steps: the activated nylon is removed and the residual phosphorus pentachloride solution on the surface of the activated nylon is removed using n-hexane solvent to obtain cleaned nylon.

5. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The bath ratio of the washed nylon to the hyperbranched polylysine solution is 1:

30.

6. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The washed nylon is immersed in a 15-30 wt% hyperbranched polylysine solution for grafting reaction to obtain grafted nylon. The process includes the following steps: adding triethylamine solution, fatty alcohol polyoxyethylene ether penetrant and the washed nylon to a 15-30 wt% hyperbranched polylysine solution; the washed nylon and the hyperbranched polylysine solution are then subjected to a grafting reaction to obtain grafted nylon; wherein the grafting reaction temperature is 80℃ and the grafting reaction time is 15-60 min.

7. The method for preparing an antibacterial and deodorizing nylon according to claim 6, characterized in that: The concentration of the triethylamine solution is 10 wt%.

8. The method for preparing an antibacterial and deodorizing nylon according to claim 6, characterized in that: The amount of the fatty alcohol polyoxyethylene ether penetrant added is 1 wt% of the mass of the hyperbranched polylysine solution.

9. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The grafted nylon is removed and surface residues are removed to obtain washed nylon, comprising the following steps: removing the grafted nylon and removing surface residues with deionized water to obtain washed nylon; wherein, the washing is performed three times, and each washing time is 10 minutes.

10. The method for preparing an antibacterial and deodorizing nylon according to claim 1, characterized in that: The drying temperature is 50°C and the drying time is 4 hours.

Images