Preparation method and application of nano copper antibacterial and antiviral functional masterbatch

Abstract

The present invention relates to a preparation method and application of a nano-copper antibacterial and antiviral functional masterbatch, and in particular to a preparation method and application of a functional masterbatch that achieves antibacterial and antiviral effects through the synergy of nano-copper and titanium dioxide. First, nano-elemental copper is generated on the surface of titanium dioxide by an in-situ reduction method, and then the titanium dioxide loaded with nano-elemental copper is carboxylic acid-modified and introduced into polyamide 6 by in-situ polymerization to obtain an antibacterial and antiviral functional masterbatch. The antibacterial and antiviral functional masterbatch can be melt-spun with polyamide resin in a certain proportion to obtain an antibacterial and antiviral fiber. The antibacterial and antiviral functional masterbatch prepared by the present invention will not cause harm to the environment during use, and the antibacterial and antiviral fiber prepared therefrom has the characteristics of high efficiency and long-lasting antibacterial and antiviral.

Description

Technical Field

[0001] The present invention belongs to the field of polymer functional masterbatch preparation, and relates to a preparation method and application of a nano-copper antibacterial and antiviral functional masterbatch, and in particular to a preparation method and application of a functional masterbatch that achieves antibacterial and antiviral effects through nano-copper and titanium dioxide. Background Art

[0002] The health risks caused by pathogenic bacteria have brought severe tests to people who are caught off guard, and have aroused the public's awareness of the health and safety of their living environment. The harm caused by the breeding and cross-infection of pathogenic bacteria to human health is even more difficult to estimate. Textiles have become an important medium for the spread of pathogenic bacteria, and giving textiles antibacterial functions has become increasingly valued. The development of antibacterial and antiviral functional fibers is of great significance.

[0003] Antibacterial fibers include organic antibacterial fibers and inorganic antibacterial fibers. Organic antibacterial agents have high bactericidal strength, fast speed and good effect, but their poor heat resistance, easy migration, easy decomposition, easy to produce microbial resistance, high toxicity to the human body, short service life, etc., have greatly limited their scope of application. Inorganic antibacterial agents have the advantages of broad-spectrum antibacterial, good stability, long-lasting effect and high safety, and are the focus of current antibacterial agent research.

[0004] In recent years, my country has made great progress in melt spinning antibacterial fibers by blending silver-containing antibacterial agents with masterbatches. However, silver-based antibacterial agents are expensive, easily degraded by heat, and can also damage stem cells, brain cells, liver cells, etc. Foreign countries have restricted the public promotion of the use of antibacterial nanosilver in clothing and other textiles. 2 It has high heat resistance, wide sources, low cost, and significant antibacterial effect, and has high research value and production practicality. 2 Generally, the dispersion of polyamide is poor, and the agglomerates formed will affect the spinnability of the fiber in the later stage. 2 Photocatalytic antibacterial and antiviral agents require light conditions to activate their antibacterial and antiviral properties, and their use conditions are limited. Nano-Cu as an antibacterial and antiviral agent can solve the above problems very well. It has good antibacterial and antiviral properties, and there will be no ion overflow during antibacterial and antiviral activities, which is healthy and environmentally friendly. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing and applying a nano copper antibacterial and antiviral functional masterbatch, and in particular to provide a method for preparing and applying a functional masterbatch that achieves antibacterial and antiviral effects through the synergistic effect of nano copper and titanium dioxide. 2 It can improve the dispersibility of nano-Cu and enhance the antibacterial and antiviral effects. 2It also has certain antibacterial and antiviral effects, and can cooperate with antibacterial and antiviral effects to further improve the antibacterial and antiviral effects. Nano-element copper plays an antibacterial and antiviral role by releasing reactive oxygen free radicals (ROS), and will not pollute the environment during antibacterial and antiviral effects. The size of the nano-element copper obtained by the present invention is 2-10nm, and the nano-element copper of this size has higher catalytic antibacterial and antiviral activity. Nano-copper can activate water and oxygen in the air to generate ROS. These ROS (hydroxyl free radicals, superoxide free radicals and hydrogen peroxide) have strong oxidizing properties and can directly or indirectly damage the structure and function of cells, causing cell membrane rupture and bacterial death. Further, the Cu@TiO modified by carboxylic acid 2 It not only has good compatibility with polyamide 6, but also has good compatibility with polyamide 6 in the in-situ polymerization of polyamide 6 monomer. 2 It can be evenly and stably dispersed in polyamide 6, avoiding the nanoscale Cu@TiO 2 The nano copper of the present invention has more exposed surface defects, and the carboxyl group can better complex with the nano copper to maintain the Cu@TiO 2 The nano copper is always in a reduced state, continuously releasing active oxygen free radicals to play an antibacterial and antiviral role, and the complexed carboxyl group can promote the nano copper to generate active oxygen free radicals, further improving the antibacterial and antiviral effect. Therefore, the masterbatch obtained by the present invention has a high-efficiency and lasting antibacterial and antiviral effect, and the antibacterial and antiviral masterbatch can be spun into fibers with different matrices to meet the high requirements of fiber antibacterial and antiviral properties in different fields. 2 Carboxylic acid modification allows the carboxyl group to combine with the defects exposed on the surface of nano-Cu, which helps stabilize the nano-Cu structure, prolongs the antibacterial and antiviral effect, and also helps the generation of peroxyl radicals, enhancing the antibacterial and antiviral effects.

[0006] According to a first aspect of the present invention, the present invention provides a method for preparing a nano-copper antibacterial and antiviral functional masterbatch, comprising the following steps:

[0007] (1) By weight, 2 to 5 parts of TiO 2 TiO was prepared by ultrasonic dispersion in 50 parts of deionized water. 2 Aqueous solution, 0.2-1.0 parts of copper salt is dissolved in 50 parts of deionized water to prepare a copper ion aqueous solution. 2 The caprolactam slurry and the copper ion aqueous solution were mixed in a flask, condensed and refluxed, and 50 parts of the reducing agent aqueous solution were added dropwise into the flask while stirring, and stirred at 60-90°C for 3-24 hours to obtain a dark solution. The obtained product was washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain titanium dioxide with nano-element copper loaded on the surface (Cu@TiO 2) antibacterial agent. The size of the generated nano-element copper is 2-10nm;

[0008] (2) 3-5 parts of aliphatic dibasic acid, 5-10 parts of deionized water, 100-200 parts of Cu@TiO 2 100 parts of liquid caprolactam at 80-90° C. were added, and stirred for 0.5-5 hours to obtain a titanium dioxide caprolactam slurry with nano-element copper generated on the surface modified by carboxylic acid.

[0009] (3) 30 to 40 parts of carboxylic acid-modified titanium dioxide caprolactam slurry with nano-element copper generated on the surface, 100 parts of caprolactam, and 3 to 5 parts of deionized water are added to a polymerization reactor, firstly ring-opening prepolymerization, then condensation polymerization, and finally strip casting, pelletizing, and extraction to obtain an antibacterial and antiviral polyamide 6 functional masterbatch.

[0010] The method for preparing the nano copper antibacterial and antiviral functional masterbatch as described above, in step (1), TiO 2 The conditions of ultrasonic dispersion are that the time is 20 to 60 min and the ultrasonic frequency is 30 to 60 kHz;

[0011] The method for preparing a nano copper antibacterial and antiviral functional masterbatch as described above, wherein in step (1), the copper salt refers to one of copper chloride, copper sulfate and copper nitrate;

[0012] The method for preparing a nano copper antibacterial and antiviral functional masterbatch as described above, wherein in step (1), the reducing agent aqueous solution refers to one of 0.1-0.5 mol / L citric acid, hydrazine hydrate, sodium borohydride, ascorbic acid, sodium hypophosphite, and tetrabutylammonium borohydride aqueous solution;

[0013] In the method for preparing a nano-copper antibacterial and antiviral functional masterbatch as described above, in step (2), the aliphatic dibasic acid is one of adipic acid, suberic acid, sebacic acid, and dodecanedioic acid;

[0014] The method for preparing a nano copper antibacterial and antiviral functional masterbatch as described above, wherein in step (3), the reaction conditions of the ring-opening prepolymerization are a temperature of 200 to 260° C., a pressure of 0.1 to 1.0 MPa, and a time of 2 to 5 h;

[0015] In the method for preparing the nano-copper antibacterial and antiviral functional masterbatch as described above, in step (3), the reaction conditions for the polycondensation are a temperature of 240 to 260° C., a pressure of -0.02 to -0.10 MPa, and a time of 2 to 5 hours.

[0016] The second aspect of the present invention provides an application of the nano copper antibacterial and antiviral masterbatch as described above, using the following technical solution:

[0017] The prepared antibacterial and antiviral masterbatch and polyamide resin are dried at 90-120° C. for a period of time, and then the two are blended in a certain ratio, mixed evenly, and added to a melt spinning machine for spinning to obtain antibacterial and antiviral fibers.

[0018] The use of the antibacterial and antiviral functional masterbatch as described above, wherein the polyamide resin is one of polyamide 6 and polyamide 66;

[0019] The use of an antibacterial and antiviral functional masterbatch as described above, wherein the ratio of the antibacterial and antiviral masterbatch to the polyamide resin is 10-20% of the antibacterial and antiviral masterbatch to the polyamide resin;

[0020] The application of the antibacterial and antiviral functional masterbatch as described above can produce fibers with a breaking strength of 2.8-4.0 cN / dtex and a breaking elongation of 15-30%. The antibacterial effect on Staphylococcus aureus, Escherichia coli, and Candida albicans can reach more than 99%, and the antiviral effect on influenza A (H1N1) virus can reach more than 99%. After the fiber is washed 50 times, the antibacterial rate on Escherichia coli and Staphylococcus aureus is still more than 97%, and the antiviral effect on influenza A (H1N1) virus can reach more than 97%. The fiber has good water washability and high-efficiency antibacterial and antiviral properties.

[0021] By adopting the technical solution of the present invention, the present invention can achieve the following beneficial effects:

[0022] 1. The present invention uses nano Cu as the main antibacterial and antiviral agent, without ion overflow and without causing harm to the environment.

[0023] 2. The present invention uses TiO 2 The loaded nano-Cu antibacterial agent has good dispersibility and compatibility in polyamide, and has little effect on the spinning performance and fiber mechanical properties of polyamide.

[0024] 3. The nano copper in the antibacterial and antiviral masterbatch of the present invention is always in a reduced state, and the nano copper plays an antibacterial and antiviral role by continuously releasing active oxygen free radicals, and has a highly efficient and lasting antibacterial and antiviral effect. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0026] Example 1, a preparation method and application of a highly effective antibacterial and antiviral functional masterbatch, the specific steps are as follows:

[0027] (1) By mass, 2 parts of TiO 2 Add it to 50 parts of deionized water and ultrasonicate it in an ultrasonic machine with a frequency of 60kHz for 20 minutes to prepare TiO 2 Caprolactam slurry. 0.2 parts of copper sulfate was dissolved in 50 parts of deionized water to prepare a copper ion aqueous solution. TiO 2 The caprolactam slurry and the copper ion aqueous solution were mixed in a flask, and then condensed and refluxed at 80°C. While stirring, 50 parts of 0.1 mol / L citric acid aqueous solution were added dropwise into the flask, and stirred at 60°C for 3 hours to obtain a dark solution. The obtained product was washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain Cu@TiO 2 Antimicrobial.

[0028] (2) 3 parts of suberic acid and 100 parts of Cu@TiO 2 Add 5 parts of deionized water into 100 parts of liquid caprolactam at 80 °C and stir for 0.5 h to obtain carboxylic acid-modified Cu@TiO 2 Caprolactam slurry.

[0029] (3) 30 parts of carboxylic acid-modified Cu@TiO 2 Caprolactam slurry, 100 parts of caprolactam and 3 parts of deionized water were added to the polymerization reactor, firstly carried out ring-opening prepolymerization at 200°C and 0.1Mpa for 2h, then carried out condensation polymerization at 240°C and -0.02MPa for 2h, and finally obtained high-efficiency antibacterial and antiviral masterbatch through strip casting, pelletizing and extraction.

[0030] (4) Prepare Cu@TiO 2 After the antibacterial and antiviral masterbatch and polyamide 6 were dried at 110 °C for 24 h, Cu@TiO 2 The antibacterial and antiviral masterbatch is added to polyamide 6 at a ratio of 10%, and after being evenly mixed, the mixture is added to a melt spinning machine for spinning to obtain the antibacterial and antiviral fiber.

[0031] The Cu@TiO prepared by the present invention 2 The antibacterial and antiviral fiber spun from the antibacterial and antiviral masterbatch and polyamide 6 has a breaking strength of 4.0 cN / dtex and an elongation at break of 15%. The antibacterial effect against Staphylococcus aureus, Escherichia coli, and Candida albicans can reach 99.5%, and the antiviral effect against influenza A (H1N1) virus can reach 99.3%. After the fiber is washed 50 times, the antibacterial rate against Escherichia coli and Staphylococcus aureus is still over 98%, and the antiviral effect against influenza A (H1N1) virus reaches 97.7%. It has good water wash resistance and high-efficiency antibacterial and antiviral properties.

[0032] Example 2, a preparation method and application of a highly effective antibacterial and antiviral functional masterbatch, the specific steps are as follows:

[0033] (1) By mass, 5 parts of TiO 2 Add it to 50 parts of deionized water and ultrasonicate it in an ultrasonic machine with a frequency of 30kHz for 60 minutes to prepare TiO 2 Caprolactam slurry. Dissolve 1 part of copper nitrate in 50 parts of deionized water to prepare a copper ion aqueous solution. 2 The caprolactam slurry and the copper ion aqueous solution were mixed in a flask, and then condensed and refluxed at 80°C. While stirring, 50 parts of 0.5 mol / L citric acid aqueous solution were added dropwise into the flask, and stirred at 90°C for 5 hours to obtain a dark solution. The obtained product was washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain Cu@TiO 2 Antimicrobial.

[0034] (2) 5 parts of suberic acid and 200 parts of Cu@TiO 2 Add 10 parts of deionized water to 100 parts of liquid caprolactam at 90 °C and stir for 5 h to obtain carboxylic acid-modified Cu@TiO 2 Caprolactam slurry.

[0035] (3) 40 parts of carboxylic acid-modified Cu@TiO 2 Caprolactam slurry, 100 parts of caprolactam and 5 parts of deionized water were added to the polymerization reactor, firstly carried out ring-opening prepolymerization at 260°C and 1.0 MPa for 5 hours, then carried out condensation polymerization at 260°C and -0.10 MPa for 5 hours, and finally, high-efficiency antibacterial and antiviral masterbatch was obtained through strip casting, pelletizing and extraction.

[0036] (4) Prepare Cu@TiO 2 After the antibacterial and antiviral masterbatch and polyamide 6 were dried at 110 °C for 36 h, Cu@TiO 2 The antibacterial and antiviral masterbatch is added to polyamide 6 at a ratio of 15%, and after being evenly mixed, the mixture is added to a melt spinning machine for spinning to obtain the antibacterial and antiviral fiber.

[0037] The Cu@TiO prepared by the present invention 2 The antibacterial and antiviral fiber spun from the antibacterial and antiviral masterbatch and polyamide 6 has a breaking strength of 3.2 cN / dtex and an elongation at break of 20%. The antibacterial effect against Staphylococcus aureus, Escherichia coli, and Candida albicans can reach 99.9%, and the antiviral effect against influenza A (H1N1) virus reaches 99.9%. After the fiber is washed 50 times, the antibacterial rate against Escherichia coli and Staphylococcus aureus is still over 98%, and the antiviral effect against influenza A (H1N1) virus reaches 99.3%. It has good water wash resistance and high-efficiency antibacterial and antiviral properties.

[0038] Example 3, a preparation method and application of a highly effective antibacterial and antiviral functional masterbatch, the specific steps are as follows:

[0039] (1) By mass, 3 parts of TiO 2 Add it to 50 parts of deionized water and ultrasonicate it in an ultrasonic machine with a frequency of 40kHz for 40 minutes to prepare TiO 2 Caprolactam slurry. 0.5 parts of copper chloride was dissolved in 50 parts of deionized water to prepare a copper ion aqueous solution. TiO 2 The caprolactam slurry and the copper ion aqueous solution were mixed in a flask, and then condensed and refluxed at 80°C. While stirring, 50 parts of 0.3 mol / L citric acid aqueous solution were added dropwise into the flask, and stirred at 90°C for 10 hours to obtain a dark solution. The obtained product was washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain Cu@TiO 2 Antimicrobial.

[0040] (2) 3 parts of dodecanedioic acid and 100 parts of Cu@TiO 2 Add 10 parts of deionized water to 100 parts of liquid caprolactam at 80 °C and stir for 2 h to obtain carboxylic acid-modified Cu@TiO 2 Caprolactam slurry.

[0041] (3) 30 parts of carboxylic acid-modified Cu@TiO 2 Caprolactam slurry, 100 parts of caprolactam and 4 parts of deionized water were added to the polymerization reactor, firstly carried out ring-opening prepolymerization at 230°C and 0.6Mpa for 4 hours, then carried out condensation polymerization at 250°C and -0.05MPa for 4 hours, and finally obtained high-efficiency antibacterial and antiviral masterbatch through strip casting, pelletizing and extraction.

[0042] (4) Prepare Cu@TiO 2 After the antibacterial and antiviral masterbatch and polyamide 6 were dried at 110 °C for 30 h, Cu@TiO 2 The antibacterial and antiviral masterbatch is added to polyamide 6 at a ratio of 20%, and after being evenly mixed, the mixture is added to a melt spinning machine for spinning to obtain the antibacterial and antiviral fiber.

[0043] The Cu@TiO prepared by the present invention 2The antibacterial and antiviral fiber spun from the antibacterial and antiviral masterbatch and polyamide 6 has a breaking strength of 4.0 cN / dtex and an elongation at break of 15%. The antibacterial effect against Staphylococcus aureus, Escherichia coli, and Candida albicans can reach 99.5%, and the antiviral effect against influenza A (H1N1) virus can reach 99.3%. After the fiber is washed 50 times, the antibacterial rate against Escherichia coli and Staphylococcus aureus is still over 97%, and the antiviral effect against influenza A (H1N1) virus reaches 97.7%. It has good water wash resistance and high-efficiency antibacterial and antiviral properties.

[0044] Example 4, a preparation method and application of a highly effective antibacterial and antiviral functional masterbatch, the specific steps are as follows:

[0045] (1) By mass, 4 parts of TiO 2 Add it into 50 parts of deionized water and ultrasonicate it in an ultrasonic machine with a frequency of 30kHz for 50 minutes to prepare TiO 2 Caprolactam slurry. 0.7 parts of copper sulfate was dissolved in 50 parts of deionized water to prepare a copper ion aqueous solution. TiO 2 The caprolactam slurry and the copper ion aqueous solution were mixed in a flask, and then condensed and refluxed at 80°C. While stirring, 50 parts of 0.4 mol / L citric acid aqueous solution were added dropwise into the flask, and stirred at 80°C for 6 hours to obtain a dark solution. The obtained product was washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain Cu@TiO 2 Antimicrobial.

[0046] (2) 3 parts of sebacic acid and 200 parts of Cu@TiO 2 Add 10 parts of deionized water to 100 parts of liquid caprolactam at 85 °C and stir for 5 h to obtain carboxylic acid-modified Cu@TiO 2 Caprolactam slurry.

[0047] (3) 40 parts of carboxylic acid-modified Cu@TiO 2 Caprolactam slurry, 100 parts of caprolactam and 5 parts of deionized water were added to the polymerization reactor, firstly carried out ring-opening prepolymerization at 250°C and 0.5Mpa for 4 hours, then carried out condensation polymerization at 240°C and -0.06MPa for 3 hours, and finally obtained high-efficiency antibacterial and antiviral masterbatch through strip casting, pelletizing and extraction.

[0048] (4) Prepare Cu@TiO 2 After the antibacterial and antiviral masterbatch and polyamide 6 were dried at 120 °C for 24 h, Cu@TiO 2 The antibacterial and antiviral masterbatch is added to polyamide 6 at a ratio of 20%, and after being evenly mixed, the mixture is added to a melt spinning machine for spinning to obtain the antibacterial and antiviral fiber.

[0049] The Cu@TiO prepared by the present invention 2 The antibacterial and antiviral fiber spun from the antibacterial and antiviral masterbatch and polyamide 6 has a breaking strength of 2.8 cN / dtex and an elongation at break of 24%. The antibacterial effect against Staphylococcus aureus, Escherichia coli, and Candida albicans can reach 99.9%, and the antiviral effect against influenza A (H1N1) virus reaches 99.9%. After the fiber is washed 50 times, the antibacterial rate against Escherichia coli and Staphylococcus aureus still reaches more than 99%, and the antiviral effect against influenza A (H1N1) virus reaches 99.6%. It has good water washability and high-efficiency antibacterial and antiviral properties.

[0050] Example 5, a preparation method and application of a highly effective antibacterial and antiviral functional masterbatch, the specific steps are as follows:

[0051] (1) By mass, 4 parts of TiO 2 Add it into 50 parts of deionized water and ultrasonicate it in an ultrasonic machine with a frequency of 50kHz for 30 minutes to prepare TiO 2 Caprolactam slurry. 0.6 parts of copper sulfate was dissolved in 50 parts of deionized water to prepare a copper ion aqueous solution. TiO 2 The caprolactam slurry and the copper ion aqueous solution were mixed in a flask, and then condensed and refluxed at 80°C. While stirring, 50 parts of 0.3 mol / L ascorbic acid aqueous solution were added dropwise into the flask, and stirred at 70°C for 5 hours to obtain a dark solution. The obtained product was washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain Cu@TiO 2 Antimicrobial.

[0052] (2) 3 parts of adipic acid and 150 parts of Cu@TiO 2 Add 6 parts of deionized water to 100 parts of liquid caprolactam at 90 °C and stir for 3 h to obtain carboxylic acid-modified Cu@TiO 2 Caprolactam slurry.

[0053] (3) 40 parts of carboxylic acid-modified Cu@TiO 2 Caprolactam slurry, 100 parts of caprolactam and 4 parts of deionized water were added to the polymerization reactor, firstly carried out ring-opening prepolymerization at 240°C and 0.8Mpa for 5 hours, then carried out condensation polymerization at 250°C and -0.09MPa for 2 hours, and finally obtained high-efficiency antibacterial and antiviral masterbatch through strip casting, pelletizing and extraction.

[0054] (4) Prepare Cu@TiO 2 After the antibacterial and antiviral masterbatch and polyamide 6 were dried at 100 °C for 36 h, Cu@TiO 2 The antibacterial and antiviral masterbatch is added to polyamide 6 at a ratio of 15%, and after being evenly mixed, the mixture is added to a melt spinning machine for spinning to obtain the antibacterial and antiviral fiber.

[0055] The Cu@TiO prepared by the present invention 2 The antibacterial and antiviral fiber spun from the antibacterial and antiviral masterbatch and polyamide 6 has a breaking strength of 3.5 cN / dtex and an elongation at break of 20%. The antibacterial effect against Staphylococcus aureus, Escherichia coli, and Candida albicans can reach 99.7%, and the antiviral effect against influenza A (H1N1) virus is 99.3%. After the fiber is washed 50 times, the antibacterial rate against Escherichia coli and Staphylococcus aureus is still over 98%, and the antiviral effect against influenza A (H1N1) virus is 98.2%. It has good water wash resistance and high-efficiency antibacterial and antiviral properties.

Claims

1. A method for preparing a nano copper antibacterial and antiviral functional masterbatch, characterized in that: The method comprises the following steps: (1) By weight, 2-5 parts of TiO2 are ultrasonically dispersed in 50 parts of deionized water to prepare a TiO2 aqueous solution, and 0.2-1.0 parts of copper salt are dissolved in 50 parts of deionized water to prepare a copper ion aqueous solution; the TiO2 aqueous solution and the copper ion aqueous solution are mixed in a flask, condensed and refluxed, and 50 parts of a reducing agent aqueous solution are added dropwise into the flask while stirring, and stirred at 60-90°C for 3-24 hours to obtain a dark solution; the obtained product is washed with deionized water and anhydrous ethanol, centrifuged, and finally dried to obtain a titanium dioxide antibacterial agent with nano-elemental copper generated on the surface, and the size of the generated nano-elemental copper is 2-10nm; (2) adding 3-5 parts of aliphatic dibasic acid, 5-10 parts of deionized water, and 100-200 parts of titanium dioxide with nano-elemental copper generated on the surface to 100 parts of liquid caprolactam at 80-90° C., and stirring for 0.5-5 hours to obtain a carboxylic acid-modified titanium dioxide caprolactam slurry with nano-elemental copper generated on the surface; (3) 30-40 parts of carboxylic acid-modified titanium dioxide caprolactam slurry with nano-element copper generated on the surface, 100 parts of caprolactam, and 3-5 parts of deionized water are added into a polymerization reactor, firstly ring-opening prepolymerization, then polycondensation, and finally strip casting, pelletizing, and extraction to obtain an antibacterial and antiviral polyamide 6 functional masterbatch.

2. The method for preparing a nano-copper antibacterial and antiviral functional masterbatch according to claim 1, characterized in that: In step (1), the conditions for ultrasonic dispersion of TiO2 refer to a time of 20 to 60 minutes and an ultrasonic frequency of 30 to 60 kHz; the copper salt refers to one of copper chloride, copper sulfate, and copper nitrate; and the reducing agent aqueous solution refers to one of 0.1 to 0.5 mol / L citric acid, hydrazine hydrate, sodium borohydride, ascorbic acid, sodium hypophosphite, and tetrabutylammonium borohydride aqueous solution.

3. The preparation method and application of a nano copper antibacterial and antiviral functional masterbatch according to claim 1, characterized in that: In step (2), the aliphatic dibasic acid refers to one of adipic acid, suberic acid, sebacic acid and dodecanedioic acid.

4. The preparation method and application of a nano copper antibacterial and antiviral functional masterbatch according to claim 1, characterized in that: In step (3), the reaction conditions for the ring-opening prepolymerization are a temperature of 200-260°C, a pressure of 0.1-1.0 MPa, and a time of 2-5 h; the reaction conditions for the polycondensation are a temperature of 240-260°C, a pressure of -0.02-0.10 MPa, and a time of 2-5 h.

5. An application of nano copper antibacterial and antiviral functional masterbatch, characterized by: The antibacterial and antiviral masterbatch prepared by any preparation method described in claim 1-4 and the polyamide resin are dried at 90-120° C. for a period of time, and then the two are mixed evenly according to a proportion and added to a melt spinning machine for spinning to obtain antibacterial and antiviral fibers.

6. The use of a nano copper antibacterial and antiviral functional masterbatch according to claim 5, characterized in that: The polyamide resin is one of polyamide 6 and polyamide 66; the ratio of the antibacterial and antiviral masterbatch to the polyamide resin is 10-20% of the antibacterial and antiviral masterbatch to the polyamide resin.

7. The use of a nano copper antibacterial and antiviral functional masterbatch according to claim 5, characterized in that: The breaking strength of the antibacterial and antiviral fiber is 2.8~4.0cN / dtex, and the elongation at break is 15~30%. The antibacterial effect against Staphylococcus aureus, Escherichia coli, and Candida albicans can reach more than 99%, and the antiviral effect against influenza A (H1N1) virus is more than 99%. After the fiber is washed 50 times, the antibacterial rate against Escherichia coli and Staphylococcus aureus is still more than 97%, and the antiviral effect against influenza A (H1N1) virus is more than 97%.