Organic guanidine catalytic antibacterial mildew-proof yarn and preparation method thereof

Abstract

The invention relates to an organic guanidine catalytic antibacterial mildew-proof yarn and a preparation method thereof, and belongs to the technical field of textile. Silk threads, an antibacterial agent, methyl cellulose and an organic guanidine catalyst are used as raw materials to prepare the organic guanidine catalytic antibacterial and mildew-proof yarn, the silk threads are doubled and subjected to two-for-one twisting to prepare composite yarn, and then the composite yarn is subjected to heat treatment and shaping to obtain prefabricated yarn; finally, the prefabricated yarn subjected to heat treatment, an organic guanidine catalyst, an antibacterial agent, methyl cellulose and deionized water are added into a high-pressure reaction kettle to be subjected to a catalytic reaction, and the organic guanidine catalytic antibacterial mildew-proof yarn is prepared. According to the preparation method, the organic guanidine catalyst is used for catalyzing the cross-linking reaction of methyl cellulose and the antibacterial agent, the prepared yarn is good in antibacterial effect, the inhibition rate of candida albicans and staphylococcus aureus can reach 99% or above, the effect is stable, the effective time is long, and the yarn is not prone to being affected by washing.

Description

Technical Field

[0001] The invention belongs to the field of textile technology, and in particular relates to an organic guanidine catalyzed antibacterial and mildew-proof yarn and a preparation method thereof. Background Art

[0002] Antibacterial yarn is a type of yarn that has been treated with antimicrobial agents. It has the ability to inhibit the growth of bacteria, fungi and other microorganisms. It is widely used in the textile industry to improve the hygiene and durability of products. The core of antibacterial yarn is to fix the antibacterial agent on the surface or inside the yarn, thereby giving the yarn antibacterial properties.

[0003] Among the traditional modified antibacterial fibers, silver-based modified fibers are widely used in the field of antibacterial textiles. Representative fibers include silver ion modified fibers and nanosilver modified fibers. However, although the nanosilver modified fibers have excellent antibacterial properties, the nanosilver particles may pose a potential threat to human health, such as causing skin irritation, allergic reactions, etc., and the production is difficult and the cost is high. Chitosan quaternary ammonium salt antibacterial agents have good antibacterial effects and are harmless to the human body. However, chitosan antibacterial agents are difficult to stably exist on the surface of yarn fibers and are prone to migration, so they are easily ineffective after washing. Based on this, the present invention provides an organic guanidine catalyzed antibacterial and mildew-proof yarn and a preparation method thereof, and prepares an antibacterial yarn with stable antibacterial effects and harmless to the human body. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn, so as to solve the problems mentioned in the above background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An organic guanidine catalyzed antibacterial and mildew-proof yarn comprises the following raw materials in parts by weight: 70-80 parts of silk thread, 3-4 parts of antibacterial agent, 7-10 parts of methyl cellulose, and 1.4-2 parts of organic guanidine catalyst;

[0007] A method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn comprises the following steps:

[0008] The first step is to weigh the raw materials according to the mass proportions: 70-80 parts of silk thread, 3-4 parts of antibacterial agent, 7-10 parts of methyl cellulose, and 1.4-2 parts of organic guanidine catalyst;

[0009] The second step is to make composite yarn by doubling and twisting the silk threads;

[0010] The third step is to heat-treat the composite yarn at high temperature to obtain the prefabricated yarn;

[0011] The fourth step is to put the prefabricated yarn, the organic guanidine catalyst, the antibacterial agent, the methyl cellulose and the deionized water into a high-pressure reactor, and obtain an organic guanidine catalyzed antibacterial and mildew-proof yarn through high-pressure heat treatment.

[0012] Furthermore, the antibacterial agent is one of a chitosan quaternary ammonium salt antibacterial agent and a chitosan oligosaccharide antibacterial agent.

[0013] Furthermore, the silk thread is one of nylon fiber, polyester fiber and cotton fiber.

[0014] Furthermore, in the third step, the temperature condition of the high temperature heat treatment is 120-130° C., and the time condition of the high temperature treatment is 40-50 min.

[0015] Furthermore, in the fourth step, the pressure condition of the high pressure treatment is 0.8-1 MPa and the time condition of the high pressure treatment is 60-80 min.

[0016] Further, the organic guanidine catalyst is prepared by the following steps:

[0017] Step 1, 2-amino-3-methylpyridine, 2-bromo-3-methylpyridine, potassium hydroxide and ethanol were mixed in a three-necked flask, magnetic stirring was turned on, and the mixture was reacted at room temperature for 2-3 hours. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 1;

[0018] Step 2, the intermediate 1, 2-bromopyridine, potassium hydroxide and ethanol are mixed in a three-necked flask, a condenser and a thermometer are installed, magnetic stirring is turned on, and the reaction is carried out at a temperature of 70° C. for 2-3 hours. After the reaction is completed, dilute hydrochloric acid and dichloromethane are added to the three-necked flask, and then the organic layer is separated with a separatory funnel, and the organic layer is dried and rotary evaporated to obtain the intermediate 2;

[0019] Step 3, the intermediate 2, N-bromosuccinimide and carbon tetrachloride are mixed in a three-necked flask, a condenser and a thermometer are installed, magnetic stirring is turned on, benzoyl peroxide is added to the three-necked flask, and then the system temperature is raised to 70-75° C. and reacted for 18-24 hours. After the reaction is completed, a saturated sodium bicarbonate solution is added to the three-necked flask, and the organic layer is separated with a separatory funnel, and the organic layer is dried and rotary evaporated to obtain the intermediate 3;

[0020] Step 4: Mix the intermediate 3, guanidine ethanol solution and tetrahydrofuran in a three-necked flask, start magnetic stirring, and react at room temperature for 12 hours. Then, add dilute hydrochloric acid to the three-necked flask, separate the organic layer with a separatory funnel, dry the organic layer and rotary evaporate to obtain the organic guanidine catalyst.

[0021] Furthermore, the dosage ratio of 2-amino-3-methylpyridine, 2-bromo-3-methylpyridine, potassium hydroxide and ethanol used in step 1 is 0.1 mol: 0.1-0.11 mol: 8 g: 40-50 mL.

[0022] Furthermore, the amount ratio of the intermediate 1, 2-bromopyridine, potassium hydroxide and ethanol used in step 2 is 0.07 mol: 0.08 mol: 7 g: 30-40 mL.

[0023] Furthermore, the usage ratio of intermediate 2, N-bromosuccinimide, carbon tetrachloride and benzoyl peroxide used in step 3 is 0.04 mol: 0.1 mol: 60-80 mL: 4-5 g.

[0024] Furthermore, the guanidine ethanol solution used in step 4 is a guanidine ethanol solution with a molar concentration of 1M, and the amount ratio of the intermediate 3, the guanidine ethanol solution, and tetrahydrofuran used is 0.03 mol:30 mL:60 mL.

[0025] Beneficial effects of the present invention:

[0026] 1) The present invention uses silk thread, antibacterial agent, methyl cellulose and organic guanidine catalyst as raw materials to prepare an organic guanidine catalyzed antibacterial and mildew-proof yarn. The present invention prepares a composite yarn by first doubling and twisting the silk thread, then heat-treating the composite yarn to obtain a prefabricated yarn, and finally adding the heat-treated prefabricated yarn together with the organic guanidine catalyst, antibacterial agent, methyl cellulose and deionized water into a high-pressure reactor for catalytic reaction to obtain an organic guanidine catalyzed antibacterial and mildew-proof yarn. In the preparation method of the present invention, the organic guanidine catalyst is used to catalyze the cross-linking reaction of methyl cellulose and the antibacterial agent, and the prepared yarn has good antibacterial effect, and the effect is stable and effective for a long time, and is not easily affected by water washing.

[0027] 2) The present invention uses 2-amino-3-methylpyridine and 2-bromo-3-methylpyridine as raw materials, and undergoes a nucleophilic substitution reaction under alkaline conditions to obtain intermediate 1, then uses intermediate 1 and 2-bromopyridine as raw materials, and undergoes a nucleophilic substitution reaction under alkaline conditions to obtain intermediate 2, then uses intermediate 2 as a raw material, and undergoes a halogenation reaction under the conditions of N-bromosuccinimide as a halogenating agent and benzoyl peroxide as an initiator to obtain intermediate 3, and finally uses intermediate 3 and guanidine as raw materials to obtain an organic guanidine catalyst through a nucleophilic substitution reaction; guanidine is an excellent catalytic reagent, but it is easy to react with water, so the catalytic effect is easily affected by water, and it cannot be used in an aqueous phase environment and is difficult to separate. The present invention modifies guanidine to prepare an organic guanidine catalyst, and the prepared organic guanidine catalyst has stable properties, no longer reacts with water molecules, and contains multiple pyridine ligand structures in its structure, and can undergo a coordination reaction with metal ions to form precipitation separation to achieve reuse.

[0028] 3) The method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn of the present invention is simple and easy to scale up. The raw materials used in the preparation process are harmless to the human body and are healthy and environmentally friendly. The finished yarn has good antibacterial effect and can be widely used in the field of medical supplies. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] An organic guanidine catalyst is prepared by the following steps:

[0032] Step 1, 0.1 mol 2-amino-3-methylpyridine, 0.1 mol 2-bromo-3-methylpyridine, 8 g potassium hydroxide, and 40 mL ethanol were mixed in a three-necked flask, magnetic stirring was turned on, and the reaction was carried out at room temperature for 2 h. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 1;

[0033] Step 2, 0.07 mol intermediate 1, 0.08 mol 2-bromopyridine, 7 g potassium hydroxide, and 30 mL ethanol were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 70°C for 2 h. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 2;

[0034] Step 3, 0.04 mol intermediate 2, 0.1 mol N-bromosuccinimide, and 60 mL carbon tetrachloride were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, 4 g benzoyl peroxide was added to the three-necked flask, and then the system temperature was raised to 70°C and reacted for 18 hours. After the reaction was completed, a saturated sodium bicarbonate solution was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was dried and rotary evaporated to obtain intermediate 3;

[0035] Step 4: Mix 0.03 mol intermediate 3, 30 mL of 1 M guanidine ethanol solution, and 60 mL of tetrahydrofuran in a three-necked flask, turn on magnetic stirring, and react at room temperature for 12 h. Then, add dilute hydrochloric acid to the three-necked flask, separate the organic layer with a separatory funnel, dry the organic layer, and rotary evaporate to obtain the organic guanidine catalyst.

[0036] Example 2

[0037] An organic guanidine catalyst is prepared by the following steps:

[0038] Step 1, 0.1 mol 2-amino-3-methylpyridine, 0.105 mol 2-bromo-3-methylpyridine, 8 g potassium hydroxide, and 45 mL ethanol were mixed in a three-necked flask, magnetic stirring was turned on, and the reaction was carried out at room temperature for 2.5 h. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 1;

[0039] Step 2, 0.07 mol intermediate 1, 0.08 mol 2-bromopyridine, 7 g potassium hydroxide, and 35 mL ethanol were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 70°C for 2.5 hours. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 2;

[0040] Step 3, 0.04 mol intermediate 2, 0.1 mol N-bromosuccinimide, and 70 mL carbon tetrachloride were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, 4.5 g benzoyl peroxide was added to the three-necked flask, and then the system temperature was raised to 72°C and reacted for 21 hours. After the reaction was completed, a saturated sodium bicarbonate solution was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was dried and rotary evaporated to obtain intermediate 3;

[0041] Step 4: Mix 0.03 mol intermediate 3, 30 mL of 1 M guanidine ethanol solution, and 60 mL of tetrahydrofuran in a three-necked flask, turn on magnetic stirring, and react at room temperature for 12 h. Then, add dilute hydrochloric acid to the three-necked flask, separate the organic layer with a separatory funnel, dry the organic layer, and rotary evaporate to obtain the organic guanidine catalyst.

[0042] Example 3

[0043] An organic guanidine catalyst is prepared by the following steps:

[0044] Step 1, 0.1 mol 2-amino-3-methylpyridine, 0.11 mol 2-bromo-3-methylpyridine, 8 g potassium hydroxide, and 50 mL ethanol were mixed in a three-necked flask, magnetic stirring was turned on, and the reaction was carried out at room temperature for 3 h. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 1;

[0045] Step 2, 0.07 mol intermediate 1, 0.08 mol 2-bromopyridine, 7 g potassium hydroxide, and 40 mL ethanol were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 70°C for 3 hours. After the reaction was completed, dilute hydrochloric acid and dichloromethane were added to the three-necked flask, and then the organic layer was separated with a separatory funnel, and the organic layer was dried and rotary evaporated to obtain intermediate 2;

[0046] Step 3, 0.04 mol intermediate 2, 0.1 mol N-bromosuccinimide, and 80 mL carbon tetrachloride were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, 5 g benzoyl peroxide was added to the three-necked flask, and then the system temperature was raised to 75°C and reacted for 24 hours. After the reaction was completed, a saturated sodium bicarbonate solution was added to the three-necked flask, and the organic layer was separated with a separatory funnel. The organic layer was dried and rotary evaporated to obtain intermediate 3;

[0047] Step 4: Mix 0.03 mol intermediate 3, 30 mL of 1 M guanidine ethanol solution, and 60 mL of tetrahydrofuran in a three-necked flask, turn on magnetic stirring, and react at room temperature for 12 h. Then, add dilute hydrochloric acid to the three-necked flask, separate the organic layer with a separatory funnel, dry the organic layer, and rotary evaporate to obtain the organic guanidine catalyst.

[0048] Example 4

[0049] An organic guanidine catalyzed antibacterial and mildew-proof yarn comprises the following raw materials in parts by weight: 70 parts of nylon fiber, 3 parts of chitosan quaternary ammonium salt, 7 parts of methyl cellulose, and 1.4 parts of an organic guanidine catalyst;

[0050] A method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn comprises the following steps:

[0051] The first step is to weigh the raw materials according to the mass fractions: 70 parts of nylon fiber, 3 parts of chitosan quaternary ammonium salt, 7 parts of methyl cellulose, and 1.4 parts of organic guanidine catalyst;

[0052] The second step is to make composite yarn by doubling and twisting the nylon fiber;

[0053] The third step is to heat treat the composite yarn at 120°C for 40 minutes to obtain a prefabricated yarn;

[0054] The fourth step is to put the prefabricated yarn, the organic guanidine catalyst, the chitosan quaternary ammonium salt, the methyl cellulose and the deionized water into a high pressure reactor, and perform high pressure heat treatment at 0.8 MPa for 60 minutes to obtain an organic guanidine catalyzed antibacterial and mildew proof yarn.

[0055] Example 5

[0056] An organic guanidine catalyzed antibacterial and mildew-proof yarn comprises the following raw materials in parts by weight: 80 parts of polyester fiber, 4 parts of chitosan quaternary ammonium salt, 7 parts of methyl cellulose, and 1.4 parts of an organic guanidine catalyst;

[0057] A method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn comprises the following steps:

[0058] The first step is to weigh 80 parts of polyester fiber, 4 parts of chitosan quaternary ammonium salt, 7 parts of methyl cellulose, and 1.4 parts of organic guanidine catalyst according to their mass fractions;

[0059] The second step is to make the polyester fiber into composite yarn by doubling and twisting;

[0060] The third step is to heat treat the composite yarn at 125°C for 45 minutes to obtain a prefabricated yarn;

[0061] The fourth step is to put the prefabricated yarn, the organic guanidine catalyst, the chitosan quaternary ammonium salt, the methyl cellulose and the deionized water into a high pressure reactor, and perform high pressure heat treatment at 0.9 MPa for 70 minutes to obtain an organic guanidine catalyzed antibacterial and mildew proof yarn.

[0062] Example 6

[0063] An organic guanidine catalyzed antibacterial and mildew-proof yarn comprises the following raw materials in parts by weight: 70 parts of cotton nylon fiber, 3 parts of chitosan oligosaccharide quaternary ammonium salt, 10 parts of methyl cellulose, and 2 parts of an organic guanidine catalyst;

[0064] A method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn comprises the following steps:

[0065] The first step is to weigh the raw materials according to the mass fractions: 70 parts of cotton nylon fiber, 3 parts of chitosan quaternary ammonium salt, 10 parts of methyl cellulose, and 2 parts of organic guanidine catalyst;

[0066] The second step is to make composite yarn by doubling and twisting the cotton nylon fiber;

[0067] The third step is to heat treat the composite yarn at a temperature of 130° C. for 50 minutes to obtain a prefabricated yarn;

[0068] The fourth step is to put the prefabricated yarn into a high-pressure reactor together with an organic guanidine catalyst, chitosan oligosaccharide quaternary ammonium salt, methyl cellulose, and deionized water, and perform high-pressure heat treatment at 1 MPa for 80 minutes to obtain an organic guanidine-catalyzed antibacterial and mildew-proof yarn.

[0069] Comparative Example 1

[0070] An organic guanidine-catalyzed antibacterial and mildew-proof yarn comprises the following raw materials in parts by weight: 70 parts of cotton nylon fiber, 3 parts of chitosan oligosaccharide quaternary ammonium salt, and 10 parts of methylcellulose;

[0071] A method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn comprises the following steps:

[0072] The first step is to weigh 70 parts of cotton nylon fiber, 3 parts of chitosan quaternary ammonium salt, and 10 parts of methyl cellulose according to their mass proportions;

[0073] The second step is to make composite yarn by doubling and twisting the cotton nylon fiber;

[0074] The third step is to heat treat the composite yarn at a temperature of 130° C. for 50 minutes to obtain a prefabricated yarn;

[0075] The fourth step is to put the prefabricated yarn, chitosan oligosaccharide quaternary ammonium salt, methyl cellulose and deionized water into a high-pressure reactor, and perform high-pressure heat treatment at 1 MPa for 80 minutes to obtain an organic guanidine-catalyzed antibacterial and mildew-proof yarn.

[0076] Comparative Example 2

[0077] This comparative example is the plant antibacterial yarn sold by Shandong Changda Textile Co., Ltd.

[0078] The organic guanidine catalyzed antibacterial and mildew-proof yarn in Examples 4-6 and Comparative Example 1 and the plant antibacterial yarn in Comparative Example 2 were tested for their inhibitory effects on Staphylococcus aureus and Candida albicans according to AATCC100-2019, respectively. After washing 50 times, the test was repeated. The test results are shown in Table 1:

[0079] Table 1

[0080]

[0081] It can be seen from Table 1 that the inhibition rates of the organic guanidine-catalyzed antibacterial and mildew-proof yarns of Examples 4-6 of the present invention on Staphylococcus aureus and Candida albicans are better than those of the commercially available plant antibacterial yarns, and the effects are stable, lasting, and less affected by water washing. However, the antibacterial effect of the organic guanidine-catalyzed antibacterial and mildew-proof yarn of the present invention in Comparative Example 2 is not good. The reason is that the organic guanidine catalyst of the present invention is not added, resulting in the deterioration of the cross-linking effect of the antibacterial agent chitosan oligosaccharide quaternary ammonium salt and methylcellulose. In summary, the organic guanidine-catalyzed antibacterial and mildew-proof yarn of the present invention has good antibacterial effect, lasting effect and is not easy to fail, and can be widely used in the field of medical supplies.

[0082] The above is a detailed introduction to an organic guanidine catalyzed antibacterial and mildew-proof yarn and a preparation method thereof provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enables any technician in the field to practice the present invention, including the manufacture and use of any device or system, and the implementation of any combination method. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified in a number of ways without departing from the principles of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be combined with each other in any way. The fact that these combinations are not exhaustively described in this specification is only for the purpose of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An organic guanidine catalyzed antibacterial and mildew-proof yarn, characterized in that: The invention comprises the following raw materials in parts by weight: 70-80 parts of silk thread, 3-4 parts of antibacterial agent, 7-10 parts of methyl cellulose, and 1.4-2 parts of organic guanidine catalyst; Wherein, the organic guanidine antibacterial agent is prepared by the following steps: Step 1, 2-amino-3-methylpyridine, 2-bromo-3-methylpyridine, potassium hydroxide and ethanol are mixed in a container, stirred evenly, and reacted at room temperature for 2-3 hours to obtain intermediate 1; Step 2, intermediate 1, 2-bromopyridine, potassium hydroxide and ethanol are mixed in a container, stirred evenly, and reacted at 70° C. for 2-3 h to obtain intermediate 2; Step 3, intermediate 2, N-bromosuccinimide and carbon tetrachloride are mixed in a container, stirred evenly, benzoyl peroxide is added to the container, and then the system temperature is raised to 70-75° C. and reacted for 18-24 hours to obtain intermediate 3; Step 4: Mix the intermediate 3, the ethanol solution of guanidine and tetrahydrofuran in a container, stir evenly, and react at room temperature for 12 hours to obtain the organic guanidine catalyst.

2. The organic guanidine catalyzed antibacterial and mildew-proof yarn according to claim 1, characterized in that: The amount ratio of 2-amino-3-methylpyridine, 2-bromo-3-methylpyridine, potassium hydroxide and ethanol used in step 1 is 0.1 mol: 0.1-0.11 mol: 8 g: 40-50 mL.

3. The organic guanidine catalyzed antibacterial and mildew-proof yarn according to claim 1, characterized in that: The usage ratio of the intermediate 1, 2-bromopyridine, potassium hydroxide and ethanol used in step 2 is 0.07 mol: 0.08 mol: 7 g: 30-40 mL.

4. The organic guanidine catalyzed antibacterial and mildew-proof yarn according to claim 1, characterized in that: The usage ratio of intermediate 2, N-bromosuccinimide, carbon tetrachloride and benzoyl peroxide used in step 3 is 0.04 mol: 0.1 mol: 60-80 mL: 4-5 g.

5. The organic guanidine catalyzed antibacterial and mildew-proof yarn according to claim 1, characterized in that: The guanidine ethanol solution used in step 4 is a guanidine ethanol solution with a molar concentration of 1M, and the amount ratio of the intermediate 3, the guanidine ethanol solution, and tetrahydrofuran used is 0.03 mol:30 mL:60 mL.

6. A method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn, characterized in that: The following steps are involved: The first step is to weigh the raw materials according to the mass proportions: 70-80 parts of silk thread, 3-4 parts of antibacterial agent, 7-10 parts of methyl cellulose, and 1.4-2 parts of organic guanidine catalyst; The second step is to make composite yarn by doubling and twisting the silk threads; The third step is to heat-treat the composite yarn at high temperature to obtain a prefabricated yarn; The fourth step is to put the prefabricated yarn, the organic guanidine catalyst, the antibacterial agent, the methyl cellulose and the deionized water into a high-pressure reactor, and obtain an organic guanidine catalyzed antibacterial and mildew-proof yarn through high-pressure heat treatment.

7. The method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn according to claim 6, characterized in that: Furthermore, the antibacterial agent is one of chitosan quaternary ammonium salt antibacterial agent and chitosan oligosaccharide quaternary ammonium salt antibacterial agent.

8. The method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn according to claim 6, characterized in that: The silk thread is one of nylon fiber, polyester fiber and cotton fiber.

9. The method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn according to claim 6, characterized in that: The temperature condition of high temperature heat treatment in the third step is 120-130°C, and the time condition of high temperature treatment is 40-50min.

10. The method for preparing an organic guanidine-catalyzed antibacterial and mildew-proof yarn according to claim 6, characterized in that: The pressure condition of the high pressure treatment in the fourth step is 0.8-1 MPa and the time condition of the high pressure treatment is 60-80 minutes.

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