CN111334922B

CN111334922B - Antibacterial modal composite fabric and preparation method thereof

Info

Publication number: CN111334922B
Application number: CN202010285309.5A
Authority: CN
Inventors: 曹维维
Original assignee: Huludao Starway Sporting Goods Co ltd
Current assignee: Huludao Starway sporting goods Co.,Ltd.
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2022-01-11
Anticipated expiration: 2040-04-13
Also published as: CN111334922A

Abstract

The invention provides an antibacterial modal composite fabric and a preparation method thereof.

Description

Antibacterial modal composite fabric and preparation method thereof

Technical Field

The invention relates to the technical field of textile fabrics, in particular to an antibacterial modal composite fabric and a preparation method thereof.

Background

Modal fiber, short for Modal fiber, is a cellulose regenerated fiber of high wet modulus viscose fiber developed by Austria Lanjing (Lenzing) company, the raw material of the fiber adopts beech in Europe, the beech is firstly made into wood pulp, and then the wood pulp is processed into the fiber through a special spinning process. The raw materials of the product are all natural materials, are harmless to human bodies, can be naturally decomposed and are harmless to the environment. The raw material of the modal fiber is produced from the European shrub forest, is made into wood pulp and then is manufactured by a special spinning process, and the modal fiber is a cellulose fiber, so the modal fiber belongs to the cellulose fiber as the artificial cotton and is a pure artificial fiber. Modal products are mostly used in the production of underwear because of their inherent characteristics of good softness and good moisture absorption, but their fabric stiffness is poor. The underwear fabric is closely worn, so that the underwear fabric is required to be comfortable to wear, soft and good in elasticity. At present, people have new requirements on underwear, and the performances such as antibiosis and the like are more and more valued by people.

In life, people inevitably come into contact with various microorganisms such as bacteria and fungi, and the microorganisms can rapidly propagate under proper external conditions and spread diseases by means of contact and the like, so that the physical health and normal work, study and life of people are influenced. The fiber belongs to a porous material, and a multilayer body with countless gaps is formed after the fiber is overlapped and woven, so that the fabric can easily absorb bacteria. The antibacterial finishing is to make the fabric have the function of inhibiting the growth of bacteria, maintain the sanitary living environment of the clothes and ensure the health of human body.

The antibacterial fabric has good safety, can efficiently and completely remove bacteria, fungi and mould on the fabric, keeps the fabric clean, and can prevent bacteria from regenerating and propagating. The mainstream treatment methods in the market at present have two types: one is a built-in silver ion antibacterial fabric, and an antibacterial agent is directly made into chemical fibers by adopting a spinning-grade antibacterial technology; the other is a post-processing technology, namely adding the fabric through a subsequent shaping process of the fabric. The post-treatment process is relatively simple, the cost is easy to control according to the specific requirements of customers, and the post-treatment process is the most applied one in the market.

Patent CN103498275B discloses a wool fiber and modal fiber blended fabric, which is formed by blending and weaving 20-40% of wool fibers and 60-80% of modal fibers, and antibacterial finishing is carried out by using an antibacterial finishing agent prepared from protamine sulfate, 2,4,4 '-trichloro-2' -hydroxydiphenyl ether, N-oleoyl-N-methyltaurate, polyhexamethylene biguanide hydrochloride and the like, but the fabric product described in the patent has unsatisfactory bacteriostasis rate after being washed for 30 times.

Disclosure of Invention

The invention aims to provide an antibacterial modal composite fabric and a preparation method thereof, the antibacterial modal composite fabric has excellent antibacterial performance, can still keep higher antibacterial rate after being washed by water, is soft in texture, and is particularly suitable for underwear.

In order to achieve the purpose, the invention is realized by the following scheme:

the preparation method of the antibacterial modal composite fabric comprises the steps of firstly mixing 10 parts by weight of modal fibers and 3-4 parts by weight of nano modified polyester fibers into first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7-8 parts by weight of modal fibers, 5-6 parts by weight of apocynum venetum fibers, 1-2 parts by weight of bamboo fibers and 0.2-0.4 part by weight of chitin fibers into second yarns, and weaving the second yarns on a machine to form an intermediate layer to obtain the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.03-0.05, and carrying out melt spinning to obtain the graphene-zinc oxide nano powder, wherein the molar ratio of the graphene-zinc oxide nano powder is 1: 5-8 parts of graphene oxide and zinc nitrate.

Preferably, the preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water with the weight of 5-8 times, uniformly stirring, adding graphene oxide, dispersing for 30-40 minutes by using ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 200-400 nm, and calcining to obtain the graphene-zinc oxide nano powder.

Preferably, the reduction method comprises the steps of adding a hydrazine hydrate solution with the mass concentration of 70-80%, stirring and heating at 60-80 ℃ for 2-3 hours, and cooling to room temperature (25 ℃), wherein the mass-volume ratio of the graphene oxide to the hydrazine hydrate solution is 0.01-0.02 mg: 1 mL.

Further preferably, the calcination process conditions are as follows: calcining at 200-300 ℃ for 2-4 hours, and calcining at 350-450 ℃ for 3-5 hours.

Preferably, the specific method for modifying the gamma-aminopropyltriethoxysilane is as follows: adding graphene-zinc oxide nano powder into a mixture with a volume ratio of 1: 9, soaking the mixture of gamma-aminopropyl triethoxysilane and toluene for 12 hours, and filtering to obtain the product; the mass-to-volume ratio of the graphene-zinc oxide nano powder to the mixed solution is 1 g: 10-15 mL.

Preferably, the melt spinning process conditions are as follows: the spinning temperature is 300-320 ℃, the spinning speed is 1500-1800 m/min, the drawing speed is 500-600 m/min, the drawing multiple is 3-3.5 times, the side blowing temperature is 20-25 ℃, the air supply relative humidity is 50-60%, the air speed is 0.3-0.4 m/s, and the drawing temperature is 60-70 ℃.

Preferably, the first yarn is prepared by the following method: and (3) opening and mixing the modal fiber and the nano modified polyester fiber, carding, drawing, roving, spinning and spooling to obtain the first yarn.

Preferably, the second yarn is prepared by: firstly, opening and opening modal fibers and apocynum venetum fibers, mixing, carding and drawing to obtain modal-apocynum venetum fiber strips, then respectively opening and picking, carding and drawing the bamboo fibers and the chitin fibers to obtain bamboo fiber strips and chitin fiber strips, mixing the modal-apocynum venetum fiber strips, the bamboo fiber strips and the chitin fiber strips, and then sequentially carrying out cotton spinning, secondary drawing, roving, spinning and spooling to obtain the second yarn. The bamboo fiber and the chitin fiber are independently made into strips, so that the bamboo fiber and the chitin fiber are more beneficial to uniform blending with other fiber raw materials.

Preferably, the antibacterial modal composite fabric is woven by four ways, and the specific method comprises the following steps:

the first path of knitting and the third path of knitting are both two second yarns which are fed at different yarn feeding angles, and all knitting needles participate in knitting in a looping mode to form a plating stitch structure double-yarn loop row which is mutually covered; the second path of knitting is first yarn single yarn inlet wire, and single yarn loop rows are formed by adopting a mode of alternately knitting by a knitting needle at intervals of looping and tucking and then knitting by looping and tucking; the fourth way of knitting is that two first yarns are fed by double yarns at the same yarn feeding angle, and a double-yarn loop row is formed by alternately knitting through a knitting needle at intervals of tucking and looping and then performing tucking and looping; after the weaving is carried out by the method, the single yarn or double yarn loop rows formed by the second weaving and the fourth weaving and the first weaving and the third weaving and the plating weave structure double yarn loop rows which are mutually overlapped are mutually stringed and sleeved to form the weave structure of the fabric blank, and the first yarn forms an inner surface layer and an outer surface layer; the second yarn constitutes the middle layer.

The antibacterial modal composite fabric is obtained by the preparation method.

The invention has the beneficial effects that:

according to the invention, the modal fiber and the nano modified polyester fiber are blended into the first yarn, the first yarn is woven on a machine to form the inner surface layer and the outer surface layer, then the modal fiber, the apocynum venetum fiber, the bamboo fiber and the chitin fiber are blended into the second yarn, and the intermediate layer is woven on the machine to form the intermediate layer, so that the antibacterial modal composite fabric is obtained, has excellent antibacterial performance, can still keep higher antibacterial rate after being washed by water, is soft in texture, and is particularly suitable for being used for close-fitting clothes.

Except the modal fiber, the nano modified polyester fiber, the apocynum venetum fiber, the bamboo fiber and the chitin fiber have antibacterial effects, and the fiber raw materials with the antibacterial effects are blended, so that the water washing resistance of the obtained fabric is greatly improved, and the fabric still has good antibacterial performance after being washed for many times.

The proportion of various fiber raw materials is very critical, and the modal fiber is mainly used in the inner surface layer, the outer surface layer and the middle layer, so that the fabric has good flexibility. The bamboo fiber has low strength and is easy to break, and the bamboo fiber is placed in the middle layer, so that direct pulling is reduced, and the influence on the overall strength of the fabric is avoided. The bamboo fiber and the modal fiber can be blended to enhance the strength, but the strength difference between the bamboo fiber and the modal fiber is larger, the apocynum venetum fiber and the apocynum venetum fiber are introduced into the invention to be blended, the apocynum venetum fiber and the bamboo fiber belong to plant fibers, the apocynum venetum fiber and the bamboo fiber have good compatibility, the chitin fiber is further introduced, the uniform blending is carried out through the hydrogen bond action between the apocynum venetum fiber and the bamboo fiber, and the antibacterial action is enhanced in a synergistic manner.

The total amount of the fibers of the middle layer is slightly higher than that of the inner surface layer and the outer surface layer, so that the fiber part of the middle layer can be exposed, and the fiber part of the middle layer and the fiber components of the inner surface layer and the outer surface layer cooperate to play an antibacterial role.

The dry strength of the modal fiber is higher, but the wet strength is very low, so that the modal fiber cannot be washed by a large force, and the modal fiber is damaged by washing; the polyester fiber has natural high strength, and the overall strength is greatly improved after the modal fiber and the polyester fiber are blended. The applicant carries out modification treatment on polyester fiber to enable the polyester fiber to have excellent antibacterial performance, and specifically, a nano modified polyester fiber is prepared by carrying out melt spinning on polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nano powder according to a certain mass ratio. The zinc oxide in the nano state is very easy to decompose free moving negatively charged electrons and positively charged holes to form hole-electron pairs, then capture oxygen, water and the like on the surface to generate oxygen atoms, hydroxyl radicals and the like, and further react with organic matters in bacteria to achieve the purpose of killing the bacteria. The ultrahigh conductive property of the graphene promotes electron circulation, accelerates the reaction process and greatly enhances the antibacterial performance. In the graphene-zinc oxide nano powder, the proportion of graphene and zinc oxide is proper, the improvement of antibacterial performance is limited when the amount of graphene is too small, the production cost is increased when the amount of graphene is too large, the capture capacity of nano zinc oxide is influenced, and the total antibacterial performance is reduced.

The graphene-zinc oxide nano powder is modified by gamma-aminopropyltriethoxysilane, amino is introduced, and can form a hydrogen bond effect with hydroxyl in the polyester chip, so that the compatibility of the graphene-zinc oxide nano powder and the polyester chip is effectively improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 3kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7kg of modal fibers, 5kg of apocynum venetum fibers, 1kg of bamboo fibers and 0.2kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer to obtain the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.03, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 5 and zinc nitrate as raw materials.

The preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water with the weight 5 times that of the zinc nitrate, uniformly stirring, adding graphene oxide, dispersing for 30 minutes by ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 200nm, and calcining to obtain the graphene-zinc oxide nano powder. The specific method of reduction is that hydrazine hydrate solution with mass concentration of 70% is added, stirred and heated for 2 hours at 60 ℃, and cooled to room temperature (25 ℃), and the mass volume ratio of graphene oxide to hydrazine hydrate solution is 0.01 mg: 1 mL. The calcination process conditions are as follows: calcining at 200 ℃ for 2 hours and calcining at 350 ℃ for 3 hours.

The specific method for modifying the gamma-aminopropyltriethoxysilane comprises the following steps: adding graphene-zinc oxide nano powder into a mixture with a volume ratio of 1: 9, soaking the mixture of gamma-aminopropyl triethoxysilane and toluene for 12 hours, and filtering to obtain the product; the mass-to-volume ratio of the graphene-zinc oxide nano powder to the mixed solution is 1 g: 10 mL.

The process conditions of melt spinning are as follows: the spinning temperature is 300 ℃, the spinning speed is 1500 m/min, the drawing speed is 500 m/min, the drawing multiple is 3 times, the cross air blowing temperature is 20 ℃, the relative air humidity is 50%, the air speed is 0.34m/s, and the drawing temperature is 60 ℃.

The first yarn is prepared by the following steps: and (3) opening and mixing the modal fiber and the nano modified polyester fiber, carding, drawing, roving, spinning and spooling to obtain the first yarn.

The second yarn is prepared by the following steps: firstly, opening and opening modal fibers and apocynum venetum fibers, mixing, carding and drawing to obtain modal-apocynum venetum fiber strips, then respectively opening and picking, carding and drawing the bamboo fibers and the chitin fibers to obtain bamboo fiber strips and chitin fiber strips, mixing the modal-apocynum venetum fiber strips, the bamboo fiber strips and the chitin fiber strips, and then sequentially carrying out cotton spinning, secondary drawing, roving, spinning and spooling to obtain the second yarn.

The antibacterial modal composite fabric is woven by four ways, and the specific method comprises the following steps:

Example 2

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 4kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 8kg of modal fibers, 6kg of apocynum venetum fibers, 2kg of bamboo fibers and 0.4kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer to obtain the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.05, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 8, and zinc nitrate as raw materials.

The preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water with the weight of 8 times, uniformly stirring, adding graphene oxide, dispersing for 40 minutes by ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 400nm, and calcining to obtain the graphene-zinc oxide nano powder. The specific method of reduction is that hydrazine hydrate solution with mass concentration of 80% is added, stirred and heated for 3 hours at 80 ℃, and cooled to room temperature (25 ℃), and the mass volume ratio of graphene oxide to hydrazine hydrate solution is 0.02 mg: 1 mL. The calcination process conditions are as follows: calcining at 300 deg.C for 4 hr and at 450 deg.C for 5 hr.

The specific method for modifying the gamma-aminopropyltriethoxysilane comprises the following steps: adding graphene-zinc oxide nano powder into a mixture with a volume ratio of 1: 9, soaking the mixture of gamma-aminopropyl triethoxysilane and toluene for 12 hours, and filtering to obtain the product; the mass-to-volume ratio of the graphene-zinc oxide nano powder to the mixed solution is 1 g: 15 mL.

The process conditions of melt spinning are as follows: the spinning temperature is 320 ℃, the spinning speed is 1800 m/min, the drawing speed is 600 m/min, the drawing multiple is 3.5 times, the cross air blowing temperature is 25 ℃, the relative humidity of air supply is 60%, the air speed is 0.4m/s, and the drawing temperature is 70 ℃.

Example 3

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 3kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 8kg of modal fibers, 5kg of apocynum venetum fibers, 2kg of bamboo fibers and 0.2kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer to obtain the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.05, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 5 and zinc nitrate as raw materials.

The preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water with the weight of 8 times, uniformly stirring, adding graphene oxide, dispersing for 30 minutes by ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 400nm, and calcining to obtain the graphene-zinc oxide nano powder. The specific method of reduction is that hydrazine hydrate solution with mass concentration of 70% is added, stirred and heated for 2 hours at 80 ℃, and cooled to room temperature (25 ℃), and the mass volume ratio of graphene oxide to hydrazine hydrate solution is 0.02 mg: 1 mL. The calcination process conditions are as follows: calcining at 200 ℃ for 4 hours and at 350 ℃ for 5 hours.

The process conditions of melt spinning are as follows: the spinning temperature is 320 ℃, the spinning speed is 1500 m/min, the drawing speed is 600 m/min, the drawing multiple is 3 times, the cross air blowing temperature is 25 ℃, the relative air blowing humidity is 50%, the air speed is 0.4m/s, and the drawing temperature is 60 ℃.

Example 4

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 4kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7kg of modal fibers, 6kg of apocynum venetum fibers, 1kg of bamboo fibers and 0.4kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer to obtain the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.03, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 8, and zinc nitrate as raw materials.

The preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water with the weight 5 times that of the zinc nitrate, uniformly stirring, adding graphene oxide, dispersing for 40 minutes by ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 200nm, and calcining to obtain the graphene-zinc oxide nano powder. The specific method of reduction is that hydrazine hydrate solution with mass concentration of 80% is added, stirred and heated for 3 hours at 60 ℃, and cooled to room temperature (25 ℃), and the mass volume ratio of graphene oxide to hydrazine hydrate solution is 0.01 mg: 1 mL. The calcination process conditions are as follows: calcining at 300 ℃ for 2 hours and calcining at 450 ℃ for 3 hours.

The process conditions of melt spinning are as follows: the spinning temperature is 300 ℃, the spinning speed is 1800 m/min, the drawing speed is 500 m/min, the drawing multiple is 3.5 times, the cross air blowing temperature is 20 ℃, the relative humidity of air supply is 60%, the air speed is 0.3m/s, and the drawing temperature is 70 ℃.

Example 5

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 3.5kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7.5kg of modal fibers, 5.5kg of apocynum venetum fibers, 1.5kg of bamboo fibers and 0.3kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer, thus obtaining the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.04, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 7 and zinc nitrate as raw materials.

The preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water 6 times the weight of the zinc nitrate, uniformly stirring, adding graphene oxide, dispersing for 35 minutes by ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 300nm, and calcining to obtain the graphene-zinc oxide nano powder. The specific method of reduction is that hydrazine hydrate solution with mass concentration of 75% is added, stirred and heated for 2 hours at 70 ℃, and cooled to room temperature (25 ℃), and the mass volume ratio of graphene oxide to hydrazine hydrate solution is 0.015 mg: 1 mL. The calcination process conditions are as follows: calcining at 250 ℃ for 3 hours and calcining at 400 ℃ for 4 hours.

The specific method for modifying the gamma-aminopropyltriethoxysilane comprises the following steps: adding graphene-zinc oxide nano powder into a mixture with a volume ratio of 1: 9, soaking the mixture of gamma-aminopropyl triethoxysilane and toluene for 12 hours, and filtering to obtain the product; the mass-to-volume ratio of the graphene-zinc oxide nano powder to the mixed solution is 1 g: 12 mL.

The process conditions of melt spinning are as follows: the spinning temperature is 310 ℃, the spinning speed is 1600 m/min, the drawing speed is 550 m/min, the drawing multiple is 3.2 times, the cross air blowing temperature is 22 ℃, the relative humidity of air supply is 55%, the air speed is 0.35m/s, and the drawing temperature is 65 ℃.

Comparative example 1

The preparation method of the antibacterial modal composite fabric comprises the steps of firstly spinning 13kg of modal fibers into first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7kg of modal fibers, 5kg of apocynum venetum fibers, 1kg of bamboo fibers and 0.2kg of chitin fibers to spin second yarns, and weaving the second yarns on the machine to form a middle layer, thus obtaining the antibacterial modal composite fabric.

The first yarn is prepared by the following steps: and (3) opening, mixing, carding, drawing, roving, spinning and spooling the modal fiber to obtain the first yarn.

Comparative example 2

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 3kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 12kg of modal fibers, 1kg of bamboo fibers and 0.2kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer, thus obtaining the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.03, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 5 and zinc nitrate as raw materials.

The second yarn is prepared by the following steps: firstly, modal fibers are subjected to opening and opening, mixing, cotton carding and drawing processes to obtain modal fiber slivers, then bamboo fibers and chitin fibers are subjected to opening and picking, cotton carding and drawing processes respectively to obtain bamboo fiber slivers and chitin fiber slivers, and the modal fiber slivers, the bamboo fiber slivers and the chitin fiber slivers are mixed and then subjected to cotton spinning, secondary drawing, roving, spinning and spooling processes in sequence to obtain the second yarn.

Comparative example 3

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 3kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7kg of modal fibers, 5kg of apocynum venetum fibers and 1.2kg of bamboo fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer, thus obtaining the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.03, and the graphene-zinc oxide nano powder is prepared by melt spinning, wherein the molar ratio of the graphene to the zinc oxide nano powder is 1: 5 and zinc nitrate as raw materials.

The second yarn is prepared by the following steps: firstly, opening and opening modal fibers and apocynum venetum fibers, mixing, carding and drawing to obtain modal-apocynum venetum fiber strips, then opening and picking, carding and drawing bamboo fibers to obtain bamboo fiber strips, mixing the modal-apocynum venetum fiber strips and the bamboo fiber strips, and then sequentially carrying out cotton spinning, secondary drawing, roving, spinning and spooling to obtain the second yarn.

Comparative example 4

A preparation method of an antibacterial modal composite fabric comprises the steps of firstly mixing 10kg of modal fibers and 3kg of nano modified polyester fibers to form first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7kg of modal fibers, 5kg of apocynum venetum fibers, 1kg of bamboo fibers and 0.2kg of chitin fibers to form second yarns, and weaving the second yarns on the machine to form a middle layer to obtain the antibacterial modal composite fabric; the nano modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified nano zinc oxide according to the mass ratio of 1: 0.03 obtained by melt spinning.

The specific method for modifying the gamma-aminopropyltriethoxysilane comprises the following steps: adding nano zinc oxide into a mixture with the volume ratio of 1: 9, soaking the mixture of gamma-aminopropyl triethoxysilane and toluene for 12 hours, and filtering to obtain the product; the mass volume ratio of the nano zinc oxide to the mixed solution is 1 g: 10 mL.

Test examples

The mechanical properties of the fabrics obtained in examples 1-5 and comparative examples 1 and 2 are examined by referring to GB/T3923.1-2013, and the results are shown in Table 1.

TABLE 1 investigation of mechanical Properties

	Gangqiang (cN/tex)	Wet strength (cN/tex)	Elongation at break (%, dry)
				Example 1	40	29	36.8
Example 2	40.2	29.5	36.3
				Example 3	40.5	30.1	36.9
Example 4	40.6	30.2	37.1
				Example 5	41	30.6	37.8
Comparative example 1	34	19	14.5
				Comparative example 2	36	26.3	29.8

As can be seen from Table 1, the mechanical properties of the fabrics obtained in examples 1-5 are good, and the dry strength, the wet strength and the elongation at break are all ideal. The nano modified polyester fiber is omitted in the comparative example 1, the apocynum venetum fiber is omitted in the comparative example 2, and the mechanical property is obviously poor.

The fabrics obtained in examples 1 to 5 were 25cm × 25cm in stiffness, and the fabric stiffness was measured by the national standard ZB W04003-87 "fabric stiffness test method inclined plane cantilever method", and the softness was good, and the results are shown in table 2.

TABLE 2 softness test

	Mean bending length in warp direction (cm)	Average bending length in weft direction (cm)	Coefficient of kinetic Friction (unwashed)
				Example 1	4.82	4.83	0.211
Example 2	4.81	4.82	0.21
				Example 3	4.76	4.77	0.205
Example 4	4.77	4.75	0.204
				Example 5	4.63	4.62	0.2

As can be seen from Table 2, the warp-wise average bending length and the weft-wise average bending length of examples 1 to 5 are small, and the flexibility is good, and the underwear is particularly suitable for underwear.

The antibacterial property of the fabrics obtained in the examples 1-5 and the comparative examples 1-4 is examined by referring to GB/T20944.3-2008; and (2) carrying out standard washing on the fabric to be tested for 30 times by adopting simplified washing conditions and procedures of appendix C in FZ/T73023-2006 antibacterial knitwear, wherein the washing conditions are as follows: and (3) putting the fabric to be tested into a 2g/L standard synthetic washing machine at a bath ratio of 1:30 and a water temperature of 40 +/-3 ℃, washing for 5min, then washing for 2min by using tap water at normal temperature, recording as washing once, and performing antibacterial property investigation on the fabric washed for 30 times, wherein the results are shown in Table 3.

TABLE 3 investigation of antibacterial Properties

Note: "- -" indicates an unmeasured item

As can be seen from Table 3, the fabrics obtained in examples 1 to 5 all have excellent antibacterial performance, and almost do not change after being washed for 30 times. The nano modified polyester fiber is omitted in the comparative example 1, the apocynum venetum fiber is omitted in the comparative example 2, the chitin fiber is omitted in the comparative example 3, the nano modified polyester fiber is obtained by performing melt spinning on polyester chips and gamma-aminopropyltriethoxysilane modified nano zinc oxide, the antibacterial performance is obviously poor, and the components are used for synergistically improving the antibacterial performance of the product. Comparative example 2 may generate loose structure or even fall off after continuous washing, which causes great reduction of antibacterial performance, and shows that the introduction of the apocynum venetum fiber is helpful for improving the whole structure.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The preparation method of the antibacterial modal composite fabric is characterized by comprising the following steps of firstly mixing 10 parts by weight of modal fibers and 3-4 parts by weight of nano modified polyester fibers into first yarns, weaving the first yarns on a machine to form an inner surface layer and an outer surface layer, then mixing 7-8 parts by weight of modal fibers, 5-6 parts by weight of apocynum venetum fibers, 1-2 parts by weight of bamboo fibers and 0.2-0.4 part by weight of chitin fibers into second yarns, and weaving the second yarns on the machine to form a middle layer to obtain the antibacterial modal composite fabric; the nanometer modified polyester fiber is prepared by mixing polyester chips and gamma-aminopropyltriethoxysilane modified graphene-zinc oxide nanometer powder according to the mass ratio of 1: 0.03-0.05, and carrying out melt spinning to obtain the graphene-zinc oxide nano powder, wherein the molar ratio of the graphene-zinc oxide nano powder is 1: 5-8 parts of graphene oxide and zinc nitrate as raw materials;

the specific method for modifying the gamma-aminopropyltriethoxysilane comprises the following steps: adding graphene-zinc oxide nano powder into a mixture with a volume ratio of 1: 9, soaking the mixture of gamma-aminopropyl triethoxysilane and toluene for 12 hours, and filtering to obtain the product; the mass-to-volume ratio of the graphene-zinc oxide nano powder to the mixed solution is 1 g: 10-15 mL;

the preparation method of the graphene-zinc oxide nano powder comprises the following steps: dissolving zinc nitrate in deionized water with the weight of 5-8 times, uniformly stirring, adding graphene oxide, dispersing for 30-40 minutes by using ultrasonic waves, reducing, filtering, washing, drying, grinding to the particle size of 200-400 nm, and calcining to obtain the graphene-zinc oxide nano powder;

adding a hydrazine hydrate solution with the mass concentration of 70-80%, stirring and heating at 60-80 ℃ for 2-3 hours, and cooling to room temperature of 25 ℃, wherein the mass-volume ratio of the graphene oxide to the hydrazine hydrate solution is 0.01-0.02 mg: 1 mL;

the process conditions of melt spinning are as follows: the spinning temperature is 300-320 ℃, the spinning speed is 1500-1800 m/min, the drawing speed is 500-600 m/min, the drawing multiple is 3-3.5 times, the side blowing temperature is 20-25 ℃, the air supply relative humidity is 50-60%, the air speed is 0.3-0.4 m/s, and the drawing temperature is 60-70 ℃;

the first yarn is prepared by the following steps: opening, mixing, carding, drawing, roving, spinning and spooling the modal fiber and the nano modified polyester fiber to obtain the first yarn;

the second yarn is prepared by the following steps: firstly, carrying out opening, mixing, cotton carding and drawing processes on modal fibers and apocynum venetum fibers to obtain modal-apocynum venetum fiber strips, then respectively carrying out opening picking, cotton carding and drawing processes on bamboo fibers and chitin fibers to obtain bamboo fiber strips and chitin fiber strips, mixing the modal-apocynum venetum fiber strips, the bamboo fiber strips and the chitin fiber strips, and then carrying out cotton spinning, secondary drawing, roving, spinning and spooling processes in sequence to obtain second yarns;

2. The preparation method according to claim 1, wherein the calcination process conditions are as follows: calcining at 200-300 ℃ for 2-4 hours, and calcining at 350-450 ℃ for 3-5 hours.

3. An antibacterial modal composite fabric obtained by the preparation method according to any one of claims 1-2.