CN117547922B

CN117547922B - A negative oxygen ion air purification material and its preparation process

Info

Publication number: CN117547922B
Application number: CN202311553914.6A
Authority: CN
Inventors: 葛玲; 袁燕; 陈凤; 陈永兵
Original assignee: Violet Home Textile Technology Co Ltd
Current assignee: Violet Home Textile Technology Co Ltd
Priority date: 2023-11-21
Filing date: 2023-11-21
Publication date: 2025-07-18
Anticipated expiration: 2043-11-21
Also published as: CN117547922A

Abstract

The invention provides a negative oxygen ion air purification material and a preparation process thereof, and relates to the field of textile fibers. The preparation method comprises the steps of mixing nano tourmaline powder with graphene oxide aqueous solution, performing ultrasonic dispersion, adding urea into cellulose solution, stirring uniformly, adding epichlorohydrin, stirring for 1-2h, simultaneously adding the mixture A and water-soluble polyethylene glycol solution, stirring for 1-2h to obtain spinning solution, spinning and forming to obtain fiber yarns, adding nano tourmaline powder into ethanol aqueous solution, adding double bond silane coupling agent and beta-cyclodextrin, adding starch aqueous solution to obtain a mixture B, placing the fiber yarns into the mixture B, standing for 15-18h at 1-2 ℃, performing vacuum drying at low temperature to obtain modified fiber yarns, taking the modified fiber yarns as core materials, taking plant fibers as outer fiber layers, spinning to obtain core yarns, soaking the core yarns in water for multiple times, and naturally airing. The nano tourmaline powder of the material is not easy to fall off, has strong binding strength with fiber and has strong washing fastness.

Description

Negative oxygen ion air purification material and preparation process thereof

Technical Field

The invention relates to the field of textile fibers, in particular to a negative oxygen ion air purification material and a preparation process thereof.

Background

The negative oxygen ion refers to the sum of single gas molecules and hydrogen ion groups with negative charges, has the effect of purifying air, can decompose pollutants such as formaldehyde, toluene and the like in the air, and can be combined with bacteria to change the structure of the bacteria, so that the sterilizing effect is achieved.

Negative oxygen ions are introduced into the fabric, and can release a certain amount of negative oxygen ions into the surrounding environment, so that the effect of purifying air is achieved. At present, two modes from the fabric to the addition of negative oxygen ions mainly exist, namely, the negative oxygen ion generating substances (such as tourmaline powder and the like) are directly coated, soaked and wrapped on the surface of the fiber or the fabric, so that the negative oxygen ions can be released after the fiber or the fabric is manufactured into a product. In the other process, the negative oxygen ion generating substance is mixed with the fiber raw material and then spun into fiber filaments through the working procedures of spinning and the like, so that the fibers or fabrics can release negative oxygen ions.

Patent 202210831552.1 discloses a negative ion heating graphene modified fine denier fiber and a preparation method thereof, wherein graphene oxide is utilized to modify cotton linter fibers to obtain fiber blanks, then the fiber blanks and tourmaline slurry are subjected to dispersion mixing, and the fibers capable of releasing negative oxygen ions can be obtained after washing, oiling and other operations.

Patent 202210425846.4 discloses a fabric containing negative oxygen ions and a production process thereof, wherein negative ion powder is added into a fabric treating agent, and then the fabric is treated by the treating agent, so that the fabric capable of releasing the negative oxygen ions can be obtained.

Patent 202011590445.1 discloses a method for manufacturing a fiber capable of generating negative ions, which comprises the steps of mixing tourmaline, medical stone, titanium dioxide and alumina mixed powder with an organic solvent, a coupling agent, a dispersing agent and the like, and then carrying out blending granulation and wet spinning to obtain the negative oxygen ion fiber.

The currently disclosed fiber or fabric capable of releasing negative oxygen ions has low binding fastness between tourmaline and fiber/fabric, is easy to fall off after washing, and cannot release negative oxygen ions for a long time.

Disclosure of Invention

The invention aims to provide a negative oxygen ion air purification material, wherein a part of nano tourmaline powder is attached to the inside of an inner layer fiber, a part of nano tourmaline powder is arranged on the surface of the fiber, the nano tourmaline powder is not easy to fall off, and the bonding fastness with the fiber is strong.

The invention also aims to provide a preparation method of the negative oxygen ion air purification material, and the core spun yarn fiber prepared by the method can release negative oxygen ions for a long time.

The invention solves the technical problems by adopting the following technical scheme.

In one aspect, the embodiment of the invention provides a preparation process of a negative oxygen ion air purification material, which comprises the following steps:

S1, mixing nano tourmaline powder with graphene oxide aqueous solution, performing ultrasonic dispersion to obtain a mixture A, adding urea into cellulose solution, uniformly stirring, adding epichlorohydrin, stirring for 1-2h, simultaneously adding the mixture A and water-soluble polyethylene glycol solution, stirring for 1-2h to obtain spinning solution, and performing spinning molding on the spinning solution to obtain fiber;

S2, adding nano tourmaline powder into an ethanol water solution, performing ultrasonic dispersion, adding a double bond silane coupling agent and beta-cyclodextrin, stirring uniformly, adding a starch water solution, performing ultrasonic dispersion uniformly to obtain a mixture B, placing the fiber yarn prepared in the step S2 into the mixture B, standing for 15-18h at 1-2 ℃, and performing low-temperature vacuum drying to obtain modified fiber yarn;

s3, spinning the modified fiber yarn prepared in the step S2 serving as a core material and plant fiber serving as an outer fiber layer to obtain core spun yarns;

S4, soaking the core spun yarn in water for multiple times, and naturally airing.

The modified fiber loaded with nano tourmaline powder is used as a core material, the plant fiber is used as an outer layer, the spun core yarn is obtained, and part of starch on the surface of the inner layer fiber is removed after washing, so that a certain pore is formed between the inner layer fiber and the outer layer, on one hand, the hygroscopicity and adsorptivity of the fiber can be improved, and the pore can be used for adsorbing pollutants in the air.

In some embodiments of the invention, the cellulose solution is prepared by pulverizing bamboo fiber, soaking in sodium hydroxide solution, heating to 45-55deg.C, adding carbon disulfide into the reaction system at the temperature, stirring, and maintaining the temperature for 5-6h to obtain the cellulose solution.

In some embodiments of the invention, the method further comprises the step of introducing inert gas into the reaction system through the aeration device in the heat preservation process. In the process of preparing the cellulose solution, through aeration treatment, the fiber can be fluffy, micropores are formed on the fiber, space is provided for the subsequent loading of tourmaline powder, and cyclodextrin molecules are tightly combined with fiber yarns.

In some embodiments of the invention, the double bond silane coupling agent is gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, or vinyl trimethoxysilane. The double bond coupling agent can provide double bond functional groups, can be used as a dispersing agent in the reaction process, and can avoid agglomeration of nano tourmaline powder.

In some embodiments of the invention, in step S2, further comprising, in mixture B, adding an antimicrobial agent;

Wherein the antibacterial agent comprises the following raw materials, by weight, 10-20 parts of chitosan quaternary ammonium salt, 5-10 parts of titanium dioxide and 0.5-1 part of potassium persulfate.

In the step S2, an antibacterial agent is added, chitosan quaternary ammonium salt in the antibacterial agent has certain antibacterial property, titanium dioxide can absorb ultraviolet rays, antibacterial aging of the quaternary ammonium salt is prolonged, and double-bond silane coupling agent can be used for grafting and modifying the titanium dioxide, so that the titanium dioxide has reactive double-bond groups and can be combined on fibers through reaction, and then molecular chains can be wound on the fibers in the ultrasonic dispersion process of the chitosan quaternary ammonium salt, so that the load fastness is improved.

In some embodiments of the invention, the plant fibers are one or more of cotton fibers, bamboo fibers, ramie fibers, and sisal fibers.

In some embodiments of the present invention, in the step S2, the mass ratio of the nano tourmaline powder, the double bond silane coupling agent and the beta-cyclodextrin is 1 (0.1-0.5): 1.5-3. And a small amount of silane coupling agent is added, so that the nano tourmaline powder can be dispersed and used as a bridge of inorganic and organic molecules, and the cyclodextrin can be used for coating the nano tourmaline powder more easily. And the excessive cyclodextrin is added, so that most of nano tourmaline powder can be coated, the excessive cyclodextrin can also increase the viscosity of a solution system, and the coating is more easily loaded on the fiber.

In some embodiments of the present invention, in the step S1, a mass ratio of the nano tourmaline powder to the water-soluble polyethylene glycol is 1 (0.5-1). The addition of a small amount of polyethylene glycol can increase the number of hydroxyl groups on the fiber, namely, the fiber is hydroxylated, and the hydroxyl groups can form hydrogen bonds with stronger molecular force with substances such as cyclodextrin and the like, so that the bonding strength is improved.

In some embodiments of the invention, in the step S2, the mass ratio of the nano tourmaline powder to the starch is 1 (2-5).

On the other hand, the embodiment of the invention provides a negative oxygen ion air purification material which is prepared by the preparation process.

Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:

in the application, nano tourmaline powder is loaded on the fiber in different modes, and as tourmaline can release anions, the anions in the air can play a role in purifying the air, fabrics such as curtains and the like prepared from the fiber can release anions continuously, and the effect of purifying the indoor air is achieved.

According to the application, graphene oxide is utilized to modify nano tourmaline powder, then the nano tourmaline powder is mixed with cellulose solution, water-soluble polyethylene glycol is matched, and the fiber yarn is obtained after spinning and forming, wherein the polyethylene glycol, the graphene oxide and the cellulose form a crosslinked network structure, and the nano tourmaline powder is embedded in the network structure, so that on one hand, the fastness of the tourmaline powder and a matrix can be enhanced, and on the other hand, the graphene molecules and the cellulose molecules are mutually crosslinked and wound, so that the elasticity and the strength of the fiber can be enhanced. Second, the hydroxyl groups of the polyethylene glycol in the filament can serve as the active sites for subsequent reactions.

On the other hand, the double bond silane coupling agent and beta-cyclodextrin are added into the nano tourmaline powder, the nano tourmaline powder is wrapped inside by utilizing the wrapping property of the beta-cyclodextrin, the double bond silane coupling agent can also play a role of dispersing, agglomeration of the nano tourmaline powder can be avoided in the reaction process, the formation of wrappage with smaller particle size is promoted, the cyclodextrin and the double bond silane coupling agent are easier to be attached to the fiber yarn by utilizing the adhesion effect of starch, and the cyclodextrin can form hydrogen bonds with hydroxyl groups on the fiber yarn in the low-temperature soaking process, so that the cyclodextrin wraps the nano tourmaline powder on the fiber yarn in situ, and the firmness of the nano tourmaline powder and the fiber yarn is improved.

In conclusion, the nano tourmaline powder is loaded twice, so that the load capacity of the nano tourmaline powder can be improved, the load strength can be improved, the fabric is more resistant to water washing, the retention time of the tourmaline powder on the fabric is longer, and the ageing of releasing negative oxygen ions by the fabric is longer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The present invention will be described in detail with reference to specific examples.

Example 1

S1, crushing bamboo fibers to 1-2cm, soaking the bamboo fibers in a sodium hydroxide solution with the mass fraction of 2% for 30min, heating the system to 55 ℃, adding carbon disulfide liquid into the reaction system at the temperature, stirring uniformly, preserving heat for 6h, introducing nitrogen into the reaction system through an aeration device in the process of preserving heat to obtain a cellulose solution, mixing nano tourmaline powder with a graphene oxide aqueous solution, performing ultrasonic dispersion to obtain a mixture A, adding urea into the cellulose solution, stirring uniformly, adding epichlorohydrin, stirring for 2h, adding the mixture A and a water-soluble polyethylene glycol solution, stirring for 2h, obtaining a spinning solution, filtering and defoaming the spinning solution, adding the spinning solution into a spinning bath with the temperature of 40 ℃ for spinning forming to obtain fiber yarns, wherein the spinning bath comprises 80g/L of sulfuric acid, 150g/L of sodium sulfate and 5g/L of zinc sulfate, the mass ratio of the nano tourmaline powder to the graphene oxide aqueous solution is 1:0.5, the mass ratio of the nano tourmaline powder to the graphene oxide is 1:1, and the mass ratio of the carbon disulfide to the water-soluble polyethylene glycol is 1%, and the mass ratio of the added bamboo fibers is 1%.

S2, adding nano tourmaline powder into an ethanol aqueous solution, performing ultrasonic dispersion, adding gamma-methacryloxypropyl trimethoxy silane and beta-cyclodextrin, stirring uniformly, adding a starch aqueous solution, performing ultrasonic dispersion uniformly to obtain a mixture B, placing the fiber yarn prepared in the step S2 into the mixture B, standing and soaking for 18h at 2 ℃, and performing low-temperature vacuum drying to obtain modified fiber yarn, wherein the mass ratio of the nano tourmaline powder to the double bond silane coupling agent to the beta-cyclodextrin is 1:0.1:1.5, and the mass ratio of the nano tourmaline powder to the starch is 1:3;

S3, spinning the modified fiber yarn prepared in the step S2 serving as a core material and cotton fiber serving as an outer fiber layer to obtain core spun yarns;

s4, soaking the core spun yarn in water for 3 times, soaking for 20 minutes each time, and naturally airing.

Example 2

S1, crushing bamboo fibers to 1-2cm, soaking the bamboo fibers in a sodium hydroxide solution with the mass fraction of 4% for 30min, heating the system to 45 ℃, adding carbon disulfide liquid into a reaction system at the temperature, stirring uniformly, preserving heat for 6h, introducing nitrogen into the reaction system through an aeration device in the process of preserving heat to obtain a cellulose solution, mixing nano tourmaline powder with a graphene oxide aqueous solution, performing ultrasonic dispersion to obtain a mixture A, adding urea into the cellulose solution, stirring uniformly, adding epichlorohydrin, stirring for 1.5h, adding the mixture A and a water-soluble polyethylene glycol solution, stirring for 2h, obtaining a spinning solution, filtering and defoaming the spinning solution, adding the spinning solution into a spinning bath with the temperature of 45 ℃ for spinning and forming, wherein the spinning bath comprises 80g/L of sulfuric acid, 150g/L of sodium sulfate and 5g/L of zinc sulfate, the mass ratio of the nano tourmaline powder to the water-soluble polyethylene glycol is 1:1, the mass ratio of the nano tourmaline powder to the graphene oxide is 1:1, and the mass ratio of the carbon disulfide to the water-soluble polyethylene glycol is 1% of the bamboo fibers.

S2, adding nano tourmaline powder into an ethanol aqueous solution, performing ultrasonic dispersion, adding gamma-methacryloxypropyl trimethoxy silane and beta-cyclodextrin, stirring uniformly, adding a starch aqueous solution, performing ultrasonic dispersion uniformly to obtain a mixture B, placing the fiber yarn prepared in the step S2 into the mixture B, standing and soaking for 18h at 2 ℃, and performing low-temperature vacuum drying to obtain modified fiber yarn, wherein the mass ratio of the nano tourmaline powder to the double bond silane coupling agent to the beta-cyclodextrin is 1:0.2:2, and the mass ratio of the nano tourmaline powder to the starch is 1:3;

Example 3

S1, crushing bamboo fibers to 1-2cm, soaking the bamboo fibers in a sodium hydroxide solution with the mass fraction of 2% for 30min, heating the system to 55 ℃, adding carbon disulfide liquid into a reaction system at the temperature, stirring uniformly, preserving heat for 5h, introducing nitrogen into the reaction system through an aeration device in the process of preserving heat to obtain a cellulose solution, mixing nano tourmaline powder with a graphene oxide aqueous solution, performing ultrasonic dispersion to obtain a mixture A, adding urea into the cellulose solution, stirring uniformly, adding epichlorohydrin, stirring for 2h, adding the mixture A and a water-soluble polyethylene glycol solution, stirring for 2h, obtaining a spinning solution, filtering and defoaming the spinning solution, adding the spinning solution into a spinning bath with the temperature of 40 ℃ for spinning, and forming to obtain the fiber yarns, wherein the spinning bath comprises 80g/L of sulfuric acid, 150g/L of sodium sulfate and 5g/L of zinc sulfate, the mass ratio of the nano tourmaline powder to the graphene oxide aqueous solution is 1:0.8, the mass ratio of the nano tourmaline powder to the graphene oxide is 1:1.5, and the mass ratio of the carbon disulfide to the water-soluble polyethylene glycol is 1% of the bamboo fibers.

S2, adding nano tourmaline powder into an ethanol aqueous solution, performing ultrasonic dispersion, adding gamma-methacryloxypropyl trimethoxy silane and beta-cyclodextrin, stirring uniformly, adding a starch aqueous solution, performing ultrasonic dispersion uniformly to obtain a mixture B, placing the fiber yarn prepared in the step S2 into the mixture B, standing and soaking for 18h at 1 ℃, and performing low-temperature vacuum drying to obtain modified fiber yarn, wherein the mass ratio of the nano tourmaline powder to the double bond silane coupling agent to the beta-cyclodextrin is 1:0.5:1.5, and the mass ratio of the nano tourmaline powder to the starch is 1:3;

S3, spinning to obtain core spun yarns by taking the modified fiber yarns prepared in the step S2 as core materials and taking ramie fibers as outer fiber layers;

Example 4

S2, adding nano tourmaline powder into an ethanol aqueous solution, performing ultrasonic dispersion, adding gamma-methacryloxypropyl trimethoxy silane and beta-cyclodextrin, stirring uniformly, adding a starch aqueous solution, performing ultrasonic dispersion uniformly to obtain a mixture B, adding an antibacterial agent into the mixture B, wherein the antibacterial agent comprises, by weight, 10 parts of chitosan quaternary ammonium salt, 5 parts of titanium dioxide and 1 part of potassium persulfate, placing the fiber yarn prepared in the step S2 into the mixture B with the antibacterial agent, stirring at 60 ℃ for 4 hours, then cooling to 2 ℃, standing and soaking at the temperature for 18 hours, and performing low-temperature vacuum drying to obtain modified fiber yarn, wherein the mass ratio of nano tourmaline powder, a double bond silane coupling agent and beta-cyclodextrin is 1:0.1:1.5, the mass ratio of nano tourmaline powder to starch is 1:3, and the addition mass of the antibacterial agent is 5% of the dry weight of the fiber yarn;

S3, spinning the modified fiber yarn prepared in the step S2 serving as a core material and bamboo fiber serving as an outer fiber layer to obtain core spun yarns;

Example 5

The difference from example 1 is that in this example, the mass ratio of the nano tourmaline powder, the double bond silane coupling agent and the beta-cyclodextrin is 1:0.5:3, and the rest is the same as example 1.

Example 6

The difference from example 1 is that in this example, the mass ratio of the nano tourmaline powder, the double bond silane coupling agent and the beta-cyclodextrin is 1:0.1:3, and the rest is the same as example 1.

Example 7

The difference from example 1 is that in this example, the mass ratio of nano tourmaline powder to starch is 1:2, and the rest is the same as in example 1.

Example 8

The difference from example 1 is that in this example, the mass ratio of nano tourmaline powder to starch is 1:5, and the rest is the same as in example 1.

Example 9

The difference from example 1 is that in this example, the silane coupling agent is vinyltriethoxysilane, and the remainder is the same as in example 1.

Example 10

The difference from example 1 is that in this example, the silane coupling agent is vinyltrimethoxysilane, and the remainder is the same as example 1.

Example 11

The difference from example 4 is that in this example, the antibacterial agent comprises, in parts by weight, 20 parts of chitosan quaternary ammonium salt, 10 parts of titanium dioxide and 1 part of potassium persulfate, and the remainder is the same as in example 4.

Example 12

The difference from example 4 is that in this example, the antibacterial agent comprises, in parts by weight, 15 parts of chitosan quaternary ammonium salt, 5 parts of titanium dioxide and 0.5 part of potassium persulfate, and the remainder is the same as in example 4.

Comparative example 1

The difference from example 1 is that in step S2 in this comparative example, the silane coupling agent and β -cyclodextrin are not added, and the rest is the same as example 1.

Comparative example 2

The difference from example 1 is that in step S2 in this comparative example, the same amount of water was directly added without adding the starch aqueous solution, and the rest was the same as in example 1.

Comparative example 3

The difference from example 4 is that in step S2 in this comparative example, the silane coupling agent and starch are not added, and the remainder is the same as example 4.

Experimental example

The fibers of examples 1 to 12 and comparative examples 1 to 3 were woven into layers of cloth by a weaving process, and a plurality of pieces of cloth having the same size were cut out for use.

1. Determination of fabric anion occurrence

The negative ion generation amounts before washing, after washing 1 time, after washing 10 times, after washing 20 times and after washing 50 times were tested by using GB/T30128-2013 detection and evaluation of negative ion generation amount of textiles, respectively, and the results are shown in Table 1. The washing step is to put the cloth in deionized water, soak for 10min, knead for 10 times, soak for 10min again, and then take out and dry naturally. Wherein, the value of each item in Table 1 is an average value of the generation amount of 3 cloth negative ions.

TABLE 1 anion generating capacity of fabrics (per cm ³)

	Before water washing	Washing with water for 1 time	Washing with water for 10 times	After washing 20 times	Washing with water for 50 times
						Example 1	1584	1526	1423	1221	985
Example 2	1523	1501	1452	1214	1015
						Example 3	1563	1522	1421	1189	987
Example 4	1549	1509	1411	1175	1011
						Example 5	1535	1489	1421	1201	992
Example 6	1426	1403	1345	1153	1001
						Example 7	1526	1488	1406	1179	897
Example 8	1589	1511	1475	1203	1021
						Example 9	1475	1423	1369	1147	951
Example 10	1533	1478	1401	1158	963
						Example 11	1584	1514	1475	1143	976
Example 12	1563	1508	1426	1154	984
						Comparative example 1	1024	874	654	312	112
Comparative example 2	1102	1011	845	640	401
						Comparative example 3	1032	984	723	511	321

As can be seen from the data in table 1, the fabrics of examples 1 to 12 have reduced negative ion generation with increased number of water washing, because tourmaline is inevitably fallen off in a small amount during the water washing and kneading process, and the corresponding negative ion generation is reduced after the number of tourmaline is reduced. However, the fabrics of examples 1-12 still had a higher occurrence after 20 washes and a higher occurrence after 50 washes. However, the cloth of comparative examples 1 to 3 showed a remarkable decrease in the amount of negative ions generated after washing with water 50, indicating that tourmaline was largely removed during the washing process. The reason for this is that in comparative example 1, the tourmaline added in step S2 cannot be wrapped without adding the coupling agent and cyclodextrin, and has low bonding strength with the inner layer fiber, and after a plurality of water washes, the tourmaline of this part is largely fallen off, thereby causing a rapid decrease in the amount of negative ions generated. In comparative example 2, which does not add starch, i.e., the gap between the inner fiber and the outer fiber is small, tourmaline falls off more than in the comparative example, and the negative ion generation amount is correspondingly reduced.

2. Antibacterial test

Antibacterial properties were tested with reference to GB/T20944.3-2008, specifically using E.coli (ATCC 25922), measured in terms of antibacterial rate. The antibacterial ratio was an average value of 3 cloths, and the results are shown in table 2.

TABLE 2 antibacterial Rate (%)

	Before water washing	Washing with water for 1 time	Washing with water for 10 times	After washing 20 times	Washing with water for 50 times
						Example 4	98.2	97.6	95.4	92.3	90.2
Example 11	97.3	95.8	94.3	91.1	89.5
						Example 12	97.5	95.3	91.2	89.1	88.5
Comparative example 3	96.3	90.2	75.3	54.1	36.2

As can be seen from table 2, the cloths of examples 4, 11 and 12, which have excellent antibacterial properties, were able to reach about 90% in antibacterial property after washing with water several times, but for comparative example 3, a silane coupling agent was not added in the process of preparing the fiber yarn, so that the binding fastness of chitosan quaternary ammonium salt to the fiber was low, and after washing with water several times, the antibacterial agent was peeled off, resulting in a decrease in antibacterial effect.

The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Claims

1. A preparation process of a negative oxygen ion air purification material, characterized in that it comprises the following steps:

S1: mixing nano-tourmaline powder and graphene oxide aqueous solution, and ultrasonically dispersing to obtain a mixture A; adding urea to the cellulose solution, stirring evenly, and then adding epichlorohydrin, stirring for 1-2 hours; then adding the above mixture A and a water-soluble polyethylene glycol solution at the same time, stirring for 1-2 hours, to obtain a spinning solution; spinning the spinning solution to obtain fiber filaments;

S2: Add nano-tourmaline powder to an ethanol aqueous solution, disperse it by ultrasonic, then add a double-bond silane coupling agent and β-cyclodextrin, stir evenly, then add a starch aqueous solution, disperse it evenly by ultrasonic, and obtain a mixture B; place the fiber filaments prepared in step S2 in the mixture B, let it stand at 1-2°C for 15-18h, and dry it in low-temperature vacuum to obtain modified fiber filaments;

S3: using the modified fiber filaments prepared in step S2 as the core material and the plant fiber as the outer fiber layer to spin a core-spun yarn;

S4: soaking the core-spun yarn in water for multiple times and drying it naturally;

The cellulose solution is prepared by the following steps: crushing bamboo fiber, then soaking it in a sodium hydroxide solution, heating it to 45-55°C, adding carbon disulfide to the reaction system at this temperature, stirring evenly, keeping the temperature for 5-6 hours, and introducing an inert gas into the reaction system through an aeration device; obtaining the cellulose solution.

2. The preparation process of the negative oxygen ion air purification material according to claim 1, characterized in that the double bond silane coupling agent is γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane or vinyltrimethoxysilane.

3. The preparation process of the negative oxygen ion air purification material according to claim 1, characterized in that, in the step S2, it also includes adding an antibacterial agent to the mixture B;

The antibacterial agent comprises the following raw materials by weight: 10-20 parts of chitosan quaternary ammonium salt, 5-10 parts of titanium dioxide and 0.5-1 part of potassium persulfate.

4. The preparation process of the negative oxygen ion air purification material according to claim 1 is characterized in that the plant fiber is one or more of cotton fiber, bamboo fiber, ramie fiber and sisal fiber.

5. The preparation process of the negative oxygen ion air purification material according to claim 1, characterized in that, in the step S2, the mass ratio of nano tourmaline powder, double bond silane coupling agent and β-cyclodextrin is 1: (0.1-0.5): (1.5-3).

6. The preparation process of the negative oxygen ion air purification material according to claim 1, characterized in that, in the step S1, the mass ratio of the nano tourmaline powder to the water-soluble polyethylene glycol is 1: (0.5-1).

7. The preparation process of the negative oxygen ion air purification material according to claim 4, characterized in that, in the step S2, the mass ratio of nano tourmaline powder to starch is 1: (2-5).

8. A negative oxygen ion air purification material, characterized in that it is obtained by the preparation process described in any one of claims 1-7.