阅读说明：本技术 一种抗菌纱线及其制备方法和用途 (Antibacterial yarn and preparation method and application thereof ) 是由 罗长彦 薛惊理 金光 徐媛媛 候会 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种抗菌纱线及其制备方法和用途；步骤包括：原料纤维前纺预处理；将原料纤维进行混条、针梳,得到混纺粗纱；采用花捻机将锦纶作为固线、尼龙包覆丝作为芯线,混纺粗纱作为饰线制作出圈圈纱；采用拉毛机对圈圈纱拉毛处理；将拉毛处理后的圈圈纱进行绞纱、蒸纱；将蒸纱处理后的圈圈纱进行倒筒处理；其中,原料纤维为抗菌纤维和羊毛；抗菌纤维主要成分为甲壳素。制得的抗菌纱线内部结构紧密,具有优良抗静电性、柔软性以及抗菌性与吸湿性,使其具有较好的舒适性,在花式纱线以及卫生产品领域具有广泛的应用。(The invention discloses an antibacterial yarn and a preparation method and application thereof; the method comprises the following steps: pre-spinning pretreatment of raw material fibers; mixing and gilling the raw material fiber to obtain blended roving; adopting a twisting machine to take chinlon as a fixed thread, take nylon covered yarn as a core thread and take blended roving as a decorative thread to manufacture a loop yarn; napping the loop yarn by using a napping machine; twisting and steaming the looped yarns subjected to napping treatment; performing rewinding treatment on the looped yarns subjected to the yarn steaming treatment; wherein, the raw material fiber is antibacterial fiber and wool; the main component of the antibacterial fiber is chitin. The prepared antibacterial yarn has a compact internal structure, excellent antistatic property, flexibility, antibacterial property and hygroscopicity, so that the antibacterial yarn has better comfort and is widely applied to the fields of fancy yarns and sanitary products.)

1. A preparation method of the antibacterial yarn comprises the following steps:

the process 1 comprises the following steps: pre-spinning pretreatment of raw material fibers;

and (2) a process: mixing and gilling the raw material fiber to obtain blended roving;

and (3) a process: adopting a twisting machine to take chinlon as a fixed thread and nylon covered yarn as a core thread, and taking the blended roving as a decorative thread to manufacture a loop yarn;

and (4) a process: napping the loop yarn by using a napping machine;

and (5) a process: performing hanking and steaming on the looped yarns subjected to napping treatment;

and (6) a process: performing rewinding treatment on the looped yarns subjected to the yarn steaming treatment;

the raw material fiber is antibacterial fiber and wool; the main component of the antibacterial fiber is chitin.

2. The method for preparing an antibacterial yarn according to claim 1, characterized in that: in the process 2, the weight ratio of the antibacterial fibers to the wool fibers in the raw material fibers is 4-7: 3-6.

3. The method for preparing an antibacterial yarn according to claim 1, characterized in that: the raw material fiber is modified antibacterial fiber and wool; the modified antibacterial fiber is prepared from 3-pyridine formic anhydride modified antibacterial fiber.

4. The method for preparing an antibacterial yarn according to claim 1, characterized in that: in the process 2, the raw materials after strip mixing are subjected to needle combing for at least 3 times.

5. The method for preparing an antibacterial yarn according to claim 1, characterized in that: in the process 3, the chinlon is one of 70D/24F chinlon, 80D/24F chinlon and 100D/24F chinlon.

6. The method for preparing an antibacterial yarn according to claim 1, characterized in that: in the process 3, the nylon-coated yarn is one of 40/20 nylon-coated yarn, 50/20 nylon-coated yarn and 30/70 nylon-coated yarn.

7. The method for preparing an antibacterial yarn according to claim 1, characterized in that: in the process 3, the twist number in the twisting machine is 650-950 twists/m, and the twisting direction is Z; the external twist number is 300-750 twists/m, and the twist direction is 'S'; the overfeed ratio is 1.5-2.5, and the rotating speed is 7500-8500 r/min.

8. The method for preparing an antibacterial yarn according to claim 1, characterized in that: in the process 5, the yarn steaming temperature is 75-85 ℃, and the time is 30-60 min.

9. An antibacterial yarn obtained by the production method according to any one of claims 1 to 8.

10. Use of the antimicrobial yarn of claim 9 in fancy yarn.

Technical Field

The invention belongs to the field of textiles, and particularly relates to an antibacterial yarn and a preparation method and application thereof.

Background

Practical studies of antibacterial fibers have been conducted in developed countries as early as 60 s in the 20 th century, and after 80 s, antibacterial fibers have been widely used in developed countries represented by japan and the usa. The industrialized research of the antibacterial fiber in China is started later relative to developed countries, and the antibacterial finishing agent is mainly applied in the early 90 th year period; organic additive type antibacterial fibers began to appear after 1995; inorganic antimicrobial fibers began to enter the market after 1997; the nano material is applied to the antibacterial fiber after 2000 years.

The antibacterial fiber has special antibacterial and bactericidal mechanism. It can prevent the spread of diseases, ensure the relative safety of human body and reduce cross infection rate, so that the clothing and the textile used for decoration have the new health care function. Due to the global outbreak of new crown epidemic situation, people pay more attention to antibacterial products and further approve the characteristics of the antibacterial products. And the antibacterial products will be more in demand in daily life because of their properties.

Disclosure of Invention

The invention aims to provide an antibacterial yarn which has a compact internal structure, excellent antistatic property, flexibility, antibacterial property and hygroscopicity, has better comfort and can be widely applied to the fields of fancy yarns and sanitary products.

The technical scheme adopted by the invention for realizing the purpose is as follows:

a preparation method of the antibacterial yarn comprises the following steps:

the process 1 comprises the following steps: pre-spinning pretreatment of raw material fibers;

and (2) a process: mixing and gilling the raw material fiber to obtain blended roving;

and (3) a process: adopting a twisting machine to take chinlon as a fixed thread, take nylon covered yarn as a core thread and take blended roving as a decorative thread to manufacture a loop yarn;

and (4) a process: napping the loop yarn by using a napping machine;

and (5) a process: twisting and steaming the looped yarns subjected to napping treatment;

and (6) a process: performing rewinding treatment on the looped yarns subjected to the yarn steaming treatment;

the raw material fiber is antibacterial fiber and wool; the main component of the antibacterial fiber is chitin.

Furthermore, in the process 2, the weight ratio of the antibacterial fiber to the wool fiber in the raw material fiber is 4-7: 3-6, and the produced product has the silky handfeel of wool and the antibacterial characteristic effect, and meanwhile, the comfort of the fabric is ensured and the sanitary and safe effect of the fabric is improved.

Furthermore, raw material fibers are modified antibacterial fibers and wool; the modified antibacterial fiber is prepared from 3-pyridine formic anhydride modified antibacterial fiber.

According to the invention, the 3-pyridine formic anhydride modified antibacterial fiber is adopted to prepare the modified antibacterial fiber, then the modified antibacterial fiber is blended with wool, and the modified antibacterial fiber is matched with the polyamide to prepare the antibacterial yarn, so that the antibacterial performance and the moisture absorption of the antibacterial yarn are further improved, and meanwhile, the antibacterial yarn has more excellent antistatic property; probably because some active groups are introduced into the antibacterial fiber by the 3-pyridine formic anhydride, the antibacterial fiber interacts with other components, and further the fiber raw materials are tightly combined and uniformly distributed, so that the antistatic property and the antibacterial property of the antibacterial yarn are improved; meanwhile, the antibacterial yarn has better moisture absorption.

Furthermore, the preparation method of the modified antibacterial fiber comprises the following steps: adding 35-50 parts by weight of antibacterial fiber into a mixed solution of 220-250 parts by weight of dichloromethane, 120-140 parts by weight of glacial acetic acid and 150-250 parts by weight of 3-pyridine formic anhydride, stirring at 0-3 ℃ under the protection of a nitrogen atmosphere to a temperature close to the ice bath temperature, slowly adding 2-5 parts by weight of perchloric acid, stirring for reaction for 10-14 h, filtering, sequentially washing with methanol, acetone, a 5% sodium bicarbonate solution and distilled water for 3-5 times, filtering and drying to obtain the modified antibacterial fiber.

Further, in the process 2, the raw material after being mixed is subjected to at least 3 times of needle combing.

Furthermore, in the process 2, the yarn count of the blended roving is 2-5 Nm.

Furthermore, in the process 3, the chinlon is one of 70D/24F chinlon, 80D/24F chinlon and 100D/24F chinlon.

Furthermore, in the process 3, the nylon-coated yarn is one of 40/20 nylon-coated yarn, 50/20 nylon-coated yarn and 30/70 nylon-coated yarn.

Furthermore, in the process 3, the twist number in the twisting machine is 650-950 twists/m, and the twisting direction is "Z"; the external twist number is 300-750 twists/m, and the twist direction is 'S'; the overfeed ratio is 1.5-2.5, the rotating speed is 7500-8500 rpm, the vehicle speed is improved, and further the production efficiency is improved.

Furthermore, in the process 4, the napping production environment is 50-60%, the temperature is 18-22 ℃, so that the toughness of the fiber raw material is increased, the roller-fuzzing phenomenon is reduced, and the productivity is improved.

Furthermore, in the process 5, the weight of each skein is 200-240 g; the yarn steaming temperature is 75-85 ℃, and the time is 30-60 min, so that the product has good resilience.

Furthermore, in the process 6, the rewinding speed is 180-220 m/min.

The invention also discloses the antibacterial yarn.

The invention also discloses the application of the antibacterial yarn in fancy yarn.

Further, in order to make the obtained product have more excellent service performance, the preferable measures adopted also comprise: in the pretreatment process of the pre-spinning of the raw material fiber, the raw material fiber is added into a treatment solution containing wool oil, an antistatic agent, steviol-19-glucoside and water for pretreatment.

According to the invention, the fiber raw materials (antibacterial fibers and wool) are pretreated by adopting the wool-blending oil, the antistatic agent and the steviol-19-glucoside, so that the antistatic property of the fiber raw materials is improved, the accumulation of static charges among the fibers is reduced, and the antistatic property of the antibacterial yarn is further improved; the addition of the steviol-19-glucoside, which has a synergistic effect with the wool oil and the antistatic agent, can ensure that the fiber raw materials are tightly combined and uniformly distributed, thereby improving the softness and antibacterial property of the antibacterial yarn; meanwhile, the antibacterial yarn has better moisture absorption.

Furthermore, the raw oil is 5-10 parts by weight, the antistatic agent is 1-8 parts by weight, the steviol-19-glucoside is 1-5 parts by weight, and the water is 75-90 parts by weight.

Further, it is to be noted that, specifically, the raw fiber pre-spinning pretreatment is as follows: according to the weight parts, 5-10 parts of crude oil, 1-8 parts of antistatic agent, 1-5 parts of steviol-19-glucoside and 75-90 parts of water are stirred and mixed uniformly to obtain a treatment solution; and adding the raw material fiber into the treatment liquid for pretreatment, standing for 18-24 h, and drying to obtain the pretreated raw material fiber.

Further, it is to be noted that the antistatic agent is one of an antistatic agent SN42, an antistatic agent SN52, and an antistatic agent SN 62.

According to the invention, the 3-pyridine formic anhydride modified antibacterial fiber is adopted to prepare the modified antibacterial fiber, and then the modified antibacterial fiber is blended with wool and matched with the chinlon to prepare the antibacterial yarn, so that the antibacterial wool-blended wool-nylon antibacterial yarn has the following beneficial effects: the antibacterial yarn has excellent antibacterial performance and hygroscopicity, and has more excellent antistatic property; probably because some active groups are introduced into the antibacterial fiber by the 3-pyridine formic anhydride, the antibacterial fiber interacts with other components, and further the fiber raw materials are tightly combined and uniformly distributed, so that the antistatic property and the antibacterial property of the antibacterial yarn are improved; meanwhile, the antibacterial yarn has better moisture absorption. Therefore, the invention is the antibacterial yarn with compact internal structure, excellent antistatic property, flexibility, antibacterial property and moisture absorption, so that the antibacterial yarn has better comfort and is widely applied to the fields of fancy yarns and sanitary products.

Drawings

FIG. 1 is an SEM photograph of an antimicrobial yarn of example 1;

FIG. 2 is an infrared spectrum before and after modification of the antibacterial fiber in example 5.

Detailed Description

Furthermore, it should be noted that the antibacterial fiber of the present invention is purchased from Qingdao New dimension textile development Co., Ltd, and the main component is chitin.

The technical solution of the present invention is further described in detail below with reference to the following detailed description and the accompanying drawings:

example 1:

a preparation method of the antibacterial yarn comprises the following steps:

the process 1 comprises the following steps: respectively pretreating the antibacterial fiber and the wool before spinning, namely respectively immersing the antibacterial fiber and the wool in a treating fluid containing 5 parts by weight of wool oil, 2.5 parts by weight of antistatic agent SN42, 1.5 parts by weight of steviol-19-glucoside and 75 parts by weight of water for pretreatment, standing for 18h, and drying to obtain pretreated antibacterial fiber and wool;

and (2) a process: feeding the pretreated antibacterial fiber and wool into a sliver mixing machine according to the weight ratio of 7:3 for sliver mixing, then carrying out needle combing (first needle-two needles-three needles), and preparing yarn count into 2Nm by a roving machine to obtain blended roving;

and (3) a process: adopting a twisting machine to take 70D/24F chinlon as a fixed thread, 40/20 nylon coated yarn as a core thread, taking the blended roving yarn as a decoration thread, and controlling the internal twist degree to be 700 twists/m and the twist direction to be Z; the external twist number is 300 twists/m, and the twist direction is S; the overfeed ratio is 2.1, the rotating speed is 8000 rpm, and loop yarn is manufactured;

and (4) a process: napping the loop yarn by using a napping machine, wherein the napping production environment is 53 percent, the temperature is 20 ℃, the toughness of the fiber raw material is further increased, the roller napping phenomenon is reduced, and the productivity is improved;

and (5) a process: the looped yarns after napping treatment are shaken into skeins with the weight of 200 grams per hank, then the skeins are put into a yarn steaming box, vacuum pumping is carried out, then the temperature of the yarn steaming box is raised to 82 ℃, heat preservation is carried out for 35min, and cooling is carried out to room temperature, so that the looped yarns retract, and good rebound resilience is generated;

and (6) a process: and (3) rewinding the ring yarns subjected to the yarn steaming treatment at the rewinding speed of 200 m/min, and clearing the yarns to obtain the finished antibacterial yarns.

Example 2:

the preparation method of the antibacterial yarn is the same as the example 1 in other steps, and is different from the example 1 in that:

the process 1 comprises the following steps: respectively pretreating the antibacterial fiber and the wool before spinning, namely respectively immersing the antibacterial fiber and the wool in a treating fluid containing 8 parts by weight of wool oil, 4.5 parts by weight of antistatic agent SN52, 3.5 parts by weight of steviol-19-glucoside and 80 parts by weight of water for pretreatment, standing for 24h, and drying to obtain the pretreated antibacterial fiber and the wool.

Example 3:

the preparation method of the antibacterial yarn is the same as the example 1 in other steps, and is different from the example 1 in that:

and (2) a process: and (3) feeding the pretreated antibacterial fiber and wool into a sliver mixing machine according to the weight ratio of 5:5 for sliver mixing, then carrying out needle combing (first needle-two needles-three needles), and preparing the yarn count to be 5Nm by a roving machine to obtain the blended roving.

Example 4:

the preparation method of the antibacterial yarn is the same as the example 1 in other steps, and is different from the example 1 in that:

and (3) a process: adopting a twisting machine to take 70D/24F chinlon as a fixed thread, 40/20 nylon coated yarn as a core thread and blended roving as a decorative thread, and controlling the internal twist degree to be 800 twists/m and the twist direction to be Z; the external twist number is 400 twists/m, and the twist direction is S; the overfeed ratio is 2.5, the rotating speed is 8500 r/min, and the loop yarn is manufactured.

Example 5:

the preparation method of the antibacterial yarn is the same as the example 1 in other steps, and is different from the example 1 in that:

the antibacterial fiber is modified by adopting 3-pyridine formic anhydride, and the preparation method of the modified antibacterial fiber comprises the following steps: adding 35 parts by weight of antibacterial fiber into a mixed solution of 230 parts by weight of dichloromethane, 120 parts by weight of glacial acetic acid and 150 parts by weight of 3-pyridine formic anhydride, stirring at 0 ℃ under the protection of nitrogen atmosphere until the temperature is close to the ice bath temperature, then slowly adding 2.5 parts by weight of perchloric acid, stirring for reaction for 12 hours, filtering, sequentially washing with methanol, acetone, a 5% sodium bicarbonate solution and distilled water for 5 times, filtering and drying to obtain the modified antibacterial fiber.

Example 6:

the other steps of the preparation method of the antibacterial yarn are the same as those of the example 5, and the preparation method is different from the example 5 in that:

the preparation method of the modified antibacterial fiber comprises the following steps: adding 45 parts by weight of antibacterial fiber into a mixed solution of 250 parts by weight of dichloromethane, 130 parts by weight of glacial acetic acid and 200 parts by weight of 3-pyridine formic anhydride, stirring at 0 ℃ under the protection of nitrogen atmosphere until the temperature is close to the ice bath temperature, then slowly adding 3.5 parts by weight of perchloric acid, stirring for reaction for 12 hours, filtering, sequentially washing with methanol, acetone, a 5% sodium bicarbonate solution and distilled water for 5 times, filtering and drying to obtain the modified antibacterial fiber.

Example 7:

the other steps of the preparation method of the antibacterial yarn are the same as those of the example 5, and the preparation method is different from the example 5 in that:

the preparation method of the modified antibacterial fiber comprises the following steps: adding 50 parts by weight of antibacterial fiber into a mixed solution of 250 parts by weight of dichloromethane, 140 parts by weight of glacial acetic acid and 250 parts by weight of 3-pyridine formic anhydride, stirring at 0 ℃ under the protection of nitrogen atmosphere until the temperature is close to the ice bath temperature, then slowly adding 4.5 parts by weight of perchloric acid, stirring for reaction for 12 hours, filtering, sequentially washing with methanol, acetone, a 5% sodium bicarbonate solution and distilled water for 5 times, filtering and drying to obtain the modified antibacterial fiber.

Example 8:

the preparation method of the antibacterial yarn is the same as the example 1 in other steps, and is different from the example 1 in that:

the process 1 comprises the following steps: respectively pretreating the antibacterial fiber and the wool before spinning, namely respectively soaking the antibacterial fiber and the wool into a treatment solution containing 5 parts by weight of wool oil, 2.5 parts by weight of antistatic agent SN42 and 75 parts by weight of water for pretreatment, standing for 18h, and drying to obtain the pretreated antibacterial fiber and wool.

Test example 1:

1. determination of surface morphology of antibacterial yarn

And observing the surface appearance of the antibacterial yarn by using a KYKY-2800B type scanning electron microscope.

FIG. 1 is an SEM image of an antimicrobial yarn of example 1. As can be seen from FIG. 1, the fibers in the antibacterial yarn are tightly combined and uniformly distributed, and the surfaces of the fibers are smooth.

2. Modified antibacterial fiber infrared spectrometry

The FT-IR 5700 Fourier infrared spectrometer is adopted, a potassium bromide tabletting method is adopted to prepare a test sample, and the test range is 4000-^-1。

FIG. 2 is an infrared spectrum before and after modification of the antibacterial fiber in example 5. As can be seen from FIG. 2, the infrared spectrum of the unmodified antibacterial fiber (chitin) is 3421.5cm^-1The characteristic absorption peaks appearing nearby are the stretching vibration of hydroxyl, the stretching vibration of amino and the hydrogen bond absorption peaks in molecules and between molecules; at 1650.8cm^-1Stretching vibration with a characteristic absorption peak of C = O appearing nearby; and in the modified antibacterial fiber, the length is 3046.7cm^-1The characteristic absorption peak appearing nearby is the stretching vibration of C-H in the pyridine ring; at 1579.3cm^-1The characteristic absorption peak appears nearby as the stretching vibration of a pyridine ring (skeleton band) and is 832.6cm^-1The characteristic absorption peak appearing nearby is out-of-plane bending vibration of aromatic hydrogen in the pyridine ring; from this, it is known that the modified antibacterial fiber is obtained by modifying the antibacterial fiber with 3-pyridinecarboxylic anhydride.

Test example 2:

1. determination of antibacterial property of antibacterial yarn

The method comprises the following steps of testing the antibacterial performance of the antibacterial yarn on escherichia coli and staphylococcus aureus by adopting an oscillation shaking method, and calculating the bacteriostasis rate of the antibacterial yarn, wherein the calculation formula is as follows:

X=(A-B)/A×100%

in the formula: x is the bacteriostasis rate; a is the average colony number of a sample to be detected before the shaking culture; and B is the average colony number of the sample to be detected after the shaking culture.

TABLE 1 bacteriostasis rate of antibacterial yarn

Sample (I)	E.coli/%)	Staphylococcus aureus/%)
			Example 1	98.3	99.1
Example 2	99.2	99.5
			Example 3	97.6	98.4
Example 4	98.5	99.2
			Example 5	99.9	99.9
Example 6	99.7	99.9
			Example 7	99.9	99.8
Example 8	93.5	94.6

As can be seen from table 1, the bacteriostatic rate of the antibacterial yarn on escherichia coli is higher than 97.5% in examples 1-4, and the bacteriostatic rate on staphylococcus aureus is higher than 98%, comparing example 1 with example 8, the bacteriostatic rate of escherichia coli and staphylococcus aureus in example 1 is higher than that in example 8, which shows that steviol-19-glucoside is added into the treatment fluid during the pretreatment of the fiber raw material, so as to prepare the antibacterial yarn, which improves the antibacterial performance of the antibacterial yarn; the antibacterial rate of the antibacterial yarn on escherichia coli is higher than 99.5% in examples 5-7, the antibacterial rate on staphylococcus aureus is higher than 99.7%, comparing examples 1 with examples 5-7, the antibacterial rate of escherichia coli and staphylococcus aureus in examples 5-7 is higher than that in example 1, which shows that the antibacterial fiber is modified by 3-pyridine formic anhydride to obtain the modified antibacterial fiber, and the antibacterial yarn is prepared through various working procedures, so that the antibacterial performance of the antibacterial yarn is further improved.

2. Determination of moisture absorption of antimicrobial yarn

A YG601 type computer type fabric moisture permeameter (Wenzhou circumference instrument Co., Ltd.) is adopted to test an experimental sample, and a dynamic moisture absorption test of yarns is carried out in a constant temperature and humidity test box according to GB/T9995-1997 determination of moisture content and moisture regain of textile materials-oven drying method under the conditions that the test temperature is 20 ℃ and the relative humidity is 45%, and the dry basis moisture content is calculated according to the following calculation formula:

dry basis water content = (W-W)₀)/W₀×100%

In the formula: w₀The mass of the yarn after being dried in an oven for 3 hours; w is the quality of the yarn after 30min of moisture absorption.

TABLE 2 moisture content on dry basis of antimicrobial yarn

Sample (I)	Dry basis water content/%
		Example 1	10.6
Example 2	11.2
		Example 3	9.3
Example 4	10.4
		Example 5	12.7
Example 6	13.5
		Example 7	13.2
Example 8	7.3

As can be seen from table 2, the moisture content of the antibacterial yarn in examples 1 to 4 is higher than 9.2%, and the moisture content of the antibacterial yarn in example 1 is higher than that of example 8 in comparison with examples 1 and 8, which shows that the steviol-19-glucoside is added into the treatment solution during the pretreatment of the fiber raw material, so as to prepare the antibacterial yarn, and the moisture absorption performance of the antibacterial yarn is improved; the dry basis water content of the antibacterial yarn in the examples 5 to 7 is higher than 12.5%, and the inhibition rates of escherichia coli and staphylococcus aureus in the comparative examples 1 and 5 to 7 and the examples 5 to 7 are higher than that in the example 1, which shows that the antibacterial fiber is modified by using 3-pyridine formic anhydride to obtain the modified antibacterial fiber, and the antibacterial yarn is prepared through various processes, so that the moisture absorption performance of the antibacterial yarn is further improved.

3. Antistatic measurement of antibacterial yarn

Evaluation of electrostatic properties of textiles section: static voltage half-life test the experimental samples were tested for static resistance.

TABLE 3 half-life of antimicrobial yarn

Sample (I)	Half life/s
		Example 1	1.45
Example 2	1.37
		Example 3	1.42
Example 4	1.44
		Example 5	1.23
Example 6	1.15
		Example 7	1.22
Example 8	2.06

As can be seen from table 3, the half-life of the antibacterial yarn in examples 1 to 4 is not higher than 1.45s, and the half-life of the antibacterial yarn in example 1 is lower than that in example 8 by comparing example 1 with example 8, which shows that the steviol-19-glucoside is added to the treating fluid during the pretreatment of the fiber raw material, thereby preparing the antibacterial yarn, which improves the antistatic property of the antibacterial yarn; the half-life of the antibacterial yarn in examples 5 to 7 is less than 1.25s, the half-life of the antibacterial yarn in examples 5 to 7 is less than that of example 1 by comparing example 1 with examples 5 to 7, and the half-life of the antibacterial yarn in examples 5 to 7 is less than that of example 1, which shows that the antibacterial yarn is further improved in the antistatic property by modifying the antibacterial fiber with 3-pyridine formic anhydride to obtain the modified antibacterial fiber and performing various processes.

4. Determination of softness Properties of antibacterial yarns

The sampling and testing of the initial modulus of the yarn are carried out with reference to the GB/T3916-1997 determination of the breaking strength and the breaking elongation of textile, package yarn, single yarn. The 250 mm long antibacterial yarn was taken out from the cheese, and 20 pieces in total. The obtained yarn was subjected to sufficient pre-conditioning and conditioning, and the conditioned yarn was tested on a YG051 type yarn electronic strength tester. The relevant data were recorded and the average of the initial moduli of the 20 yarns was calculated, the lower the initial modulus, the better the yarn softness.

Table 4 initial modulus of antimicrobial yarn

Sample (I)	Initial modulus/(cN/tex)
		Example 1	62.7
Example 2	58.4
		Example 3	61.2
Example 4	63.8
		Example 5	62.6
Example 6	62.3
		Example 7	62.7
Example 8	89.3

As can be seen from Table 4, the initial modulus of the antibacterial yarns in examples 1 to 4 is lower than 64cN/tex, and compared with examples 1 and 8, the initial modulus of the antibacterial yarns in example 1 is lower than that of example 8, which shows that the steviol-19-glucoside is added into the treatment fluid during the pretreatment of the fiber raw material, so as to prepare the antibacterial yarns, and the softness of the antibacterial yarns is improved, so that the antibacterial yarns have better comfort when being prepared into fabrics; comparing example 1 with examples 5-7, and examples 5-7, the initial modulus of the antibacterial yarn in examples 5-7 is not significantly different from that in example 1, which shows that the antibacterial yarn obtained by modifying the antibacterial fiber with 3-pyridine formic anhydride to obtain the modified antibacterial fiber and performing the various processes has no significant influence on the softness of the antibacterial yarn.

Conventional operations in the operation steps of the present invention are well known to those skilled in the art and will not be described herein.

The above embodiments are merely illustrative, and not restrictive, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.