阅读说明：本技术 一种可降解无纺布及制备方法 (Degradable non-woven fabric and preparation method thereof ) 是由 杨丽虹 于 2021-04-07 设计创作，主要内容包括：本发明公开了一种可降解无纺布及制备方法,涉及无纺布技术领域,其技术方案要点包括如下重量份的组分：22-28份甘蔗渣纤维、38-46份棉纤维、18-20份麦秆纤维、12-16份托玛琳纤维。本发明具有通过结合甘蔗渣纤维、棉纤维、麦秆纤维以及托玛琳纤维,令托玛琳纤维中的托玛琳粉末其本身具有电分极现象,以及在与甘蔗渣纤维的结合中,使得托玛琳纤维处于一端产生“正极”,另一端产生“负极”的不稳定状态,由此产生电位差后电离周围空气中的水分产生负离子,并通过发射远红外线实现显著提升抑菌功能的效果。(The invention discloses a degradable non-woven fabric and a preparation method thereof, relating to the technical field of non-woven fabrics, and the key points of the technical scheme are that the degradable non-woven fabric comprises the following components in parts by weight: 22-28 parts of bagasse fibers, 38-46 parts of cotton fibers, 18-20 parts of wheat straw fibers and 12-16 parts of tourmaline fibers. The invention has the advantages that the bagasse fiber, the cotton fiber, the wheat straw fiber and the tourmaline fiber are combined, so that tourmaline powder in the tourmaline fiber has an electric polarization phenomenon, and in the combination with the bagasse fiber, the tourmaline fiber is in an unstable state that one end generates a positive pole and the other end generates a negative pole, so that moisture in the surrounding air is ionized to generate negative ions after a potential difference is generated, and the effect of remarkably improving the bacteriostatic function is realized by emitting far infrared rays.)

1. The degradable non-woven fabric is characterized by comprising the following components in parts by weight: 22-28 parts of bagasse fibers, 38-46 parts of cotton fibers, 18-20 parts of wheat straw fibers and 12-16 parts of tourmaline fibers.

2. The degradable nonwoven fabric according to claim 1, wherein: the bagasse fiber is obtained by crushing bagasse by a crusher, screening by a screen, washing, drying, putting the dried bagasse into a chlorinated 1-butyl-3-methylimidazole solution serving as a solvent medium, and carrying out covalent bond bonding with a side chain group of papain.

3. The degradable nonwoven fabric according to claim 1, wherein: the method for obtaining the cotton fiber comprises the steps of sequentially crushing raw material cotton by a crusher, washing and drying; the washing adopts essential oil and water in a weight ratio of 5:95 as a detergent.

4. The degradable nonwoven fabric according to claim 1, wherein: the method for obtaining the wheat straw fiber comprises the steps of cutting, screening and washing wheat straws in sequence, drying, pre-hydrolyzing under the pressure of 1.2-1.4MPa, the temperature of 145-160 ℃ and the liquid ratio of 1:5, and washing and bleaching the hydrolyzed wheat straws.

5. The degradable nonwoven fabric according to claim 1, wherein: the method for obtaining the tourmaline fibers comprises the following steps of: 12, dissolving chitosan in 10 mass percent acetic acid solution for decalcification, then carrying out defoaming and filtering processes on the acetic acid solution, adding the filtered chitosan into sodium hydroxide solution for deproteinization, and controlling the concentration of sodium hydroxide to be 0.1 mol/L; and finally, performing ethyl ester removal on the deproteinized chitosan in the cleaning of an acetic acid solution to form a spinning solution in sodium acetate, and placing the modified tourmaline powder into the spinning solution to be solidified into filaments by adopting calcium chloride.

6. The degradable nonwoven fabric of claim 5, wherein: the preparation method of the modified tourmaline powder comprises the steps of sequentially crushing tourmaline raw materials by a crusher, ball-milling to 400 meshes, drying, air flow crushing and air flow classification, wherein the particle size of the modified tourmaline powder is 20-160 mu m.

7. The degradable nonwoven fabric of claim 6, wherein: the drying is divided into primary drying, secondary drying and tertiary drying, wherein the primary drying is to put the ball-milled tourmaline raw material into alcohol and take out, and then dry the ball-milled tourmaline raw material for 10min at 220 ℃; the secondary drying is to put the tourmaline raw material which is dried for the first time into deionized water and take out, and then dry for 15min at 260 ℃; and the third drying is to put the tourmaline raw material dried for the second time into dimethylaminoethyl methacrylate, take out and dry for 6min at 280 ℃.

8. The preparation method of the degradable non-woven fabric is characterized by comprising the following steps:

step 1, adding 22-28 parts of bagasse fibers, 38-46 parts of cotton fibers, 18-20 parts of wheat straw fibers and 12-16 parts of tourmaline fibers in parts by weight into deionized water to form fiber slurry;

and 2, adding polyvinyl alcohol into the fiber slurry, obtaining a non-woven fabric primary material by adopting an electrostatic spinning process, and then performing line pressing treatment and cutting to obtain the antibacterial degradable cotton towel.

9. The method for preparing degradable non-woven fabric according to claim 8, wherein the method comprises the following steps: in step 1, tourmaline fibers and bagasse fibers are added into deionized water, and after uniform stirring, cotton fibers and wheat straw fibers are sequentially added to form fiber slurry.

10. The method for preparing degradable non-woven fabric according to claim 8, wherein the method comprises the following steps: in the step 2, the weight ratio of the added polyvinyl alcohol to the fiber pulp is 3-8: 90-110.

Technical Field

The invention relates to the technical field of non-woven fabrics, in particular to a degradable non-woven fabric and a preparation method thereof.

Background

As a sanitary product commonly used in life, the safety and sanitation level of the paper towel is always a focus of attention of consumers. In recent years, tissue products represented by all-cotton spunlace nonwoven cotton soft tissue have been widely accepted in the market, the tissue is produced by adopting the all-cotton spunlace nonwoven process and then being sterilized by high-pressure steam, and the safety and sanitation level can basically meet the daily life needs of consumers. However, once the cotton soft towel is packaged, a large amount of bacteria can grow in the air by the residual cotton soft towel in the package before the cotton soft towel is completely used, particularly when the cotton soft towel is placed in a washroom or a place where bacteria easily grow, so that the safety and sanitation level of the cotton soft towel in the using process is reduced.

The Chinese patent application with publication number CN109481348A discloses a moisturizing cotton soft tissue and a preparation method thereof, the moisturizing cotton soft tissue comprises a soft dry tissue and a collagen stock solution, the collagen stock solution is uniformly sprayed on the surface of the soft dry tissue, and the collagen stock solution comprises the following components in parts by weight: 2-6 parts of jojoba oil, 1.5-3 parts of aloe extract, 50-65 parts of deionized water, 1-4 parts of glycerol, 0.3-0.6 part of oligopeptide, 1-3 parts of clove oil, 2-6 parts of collagen, 0.1-0.3 part of sodium hyaluronate and 2-4 parts of 1-3 propylene glycol; the preparation method of the moisturizing cotton soft towel comprises the following steps: s1: weighing and proportioning, S2: preparation of phase a raw material, S3: preparation of phase B raw material, S4: preparing a collagen stock solution, S5: and (5) carrying out spraying treatment.

However, the moisturizing soft cotton towel can not achieve an effective antibacterial effect only by spraying the collagen stock solution on the surface of the soft dry paper towel, so that the safe use of the soft cotton towel is influenced, and needs to be improved.

Disclosure of Invention

In view of the defects of the prior art, the first object of the present invention is to provide a degradable non-woven fabric, which has the effect of significantly improving the bacteriostatic ability.

In order to achieve the purpose, the invention provides the following technical scheme:

a degradable non-woven fabric comprises the following components in parts by weight: 22-28 parts of bagasse fibers, 38-46 parts of cotton fibers, 18-20 parts of wheat straw fibers and 12-16 parts of tourmaline fibers.

The invention is further configured to: the bagasse fiber is obtained by crushing bagasse by a crusher, screening by a screen, washing, drying, putting the dried bagasse into a chlorinated 1-butyl-3-methylimidazole solution serving as a solvent medium, and carrying out covalent bond bonding with a side chain group of papain.

The invention is further configured to: the method for obtaining the cotton fiber comprises the steps of sequentially crushing raw material cotton by a crusher, washing and drying; the washing adopts essential oil and water in a weight ratio of 5:95 as a detergent.

The invention is further configured to: the method for obtaining the wheat straw fiber comprises the steps of cutting, screening and washing wheat straws in sequence, drying, pre-hydrolyzing under the pressure of 1.2-1.4MPa, the temperature of 145-160 ℃ and the liquid ratio of 1:5, and washing and bleaching the hydrolyzed wheat straws.

The invention is further configured to: the method for obtaining the tourmaline fibers comprises the following steps of 1-3 parts by weight: 12, dissolving chitosan in 10 mass percent acetic acid solution for decalcification, then carrying out deaeration and filtration processes on the acetic acid solution, adding the filtered chitosan into sodium hydroxide solution for deproteinization, and controlling the concentration of sodium hydroxide to be 0.1 mol/L; and finally, removing ethyl ester from the deproteinized chitosan in the cleaning of an acetic acid solution to form a spinning solution in sodium acetate, and placing the modified tourmaline powder into the spinning solution to be solidified into filaments by adopting calcium chloride.

The invention is further configured to: the preparation method of the modified tourmaline powder comprises the steps of sequentially crushing tourmaline raw materials by a crusher, ball-milling to 400 meshes, drying, air flow crushing and air flow classification, wherein the particle size of the modified tourmaline powder is 20-160 mu m.

The invention is further configured to: the drying is divided into primary drying, secondary drying and tertiary drying, wherein the primary drying is to put the ball-milled tourmaline raw material into alcohol, take out the alcohol and dry the alcohol at 220 ℃ for 10 min; the secondary drying is to put the tourmaline raw material which is dried for the first time into deionized water and take out, and then to dry 15min at 260 ℃; and the third drying is to put the tourmaline raw material subjected to the second drying into dimethylaminoethyl methacrylate and take out, and then dry the tourmaline raw material at 280 ℃ for 6 min.

The second purpose of the invention is to provide a preparation method of degradable non-woven fabric, which comprises the following steps:

step 1, adding 22-28 parts of bagasse fibers, 38-46 parts of cotton fibers, 18-20 parts of wheat straw fibers and 12-16 parts of tourmaline fibers in parts by weight into deionized water to form fiber slurry;

and 2, adding polyvinyl alcohol into the fiber slurry, obtaining a non-woven fabric primary material by adopting an electrostatic spinning process, and then performing line pressing treatment and cutting to obtain the antibacterial degradable cotton towel.

The invention is further configured to: in step 1, tourmaline fibers and bagasse fibers are added into deionized water, and after uniform stirring, cotton fibers and wheat straw fibers are sequentially added to form fiber slurry.

The invention is further configured to: in the step 2, the weight ratio of the added polyvinyl alcohol to the fiber pulp is 3-8: 90-110.

In conclusion, the invention has the following beneficial effects:

1. by combining bagasse fibers, cotton fibers, wheat straw fibers and tourmaline fibers, tourmaline powder in the tourmaline fibers has an electric polarization phenomenon, so that the tourmaline fibers are in an unstable state that one end generates a positive electrode and the other end generates a negative electrode, and therefore moisture in surrounding air is ionized to generate negative ions after a potential difference is generated, and the effect of remarkably improving the antibacterial function is achieved by emitting far infrared rays;

2. the heat stability of the degradable non-woven fabric is obviously improved by combining the covalent bond in bagasse fiber with papain, and the degradable non-woven fabric is mainly made of bagasse and has the characteristic of oil absorption, so that the degradable non-woven fabric has the combination stability obviously when being combined with cotton fiber, wheat straw fiber and tourmaline fiber, and meanwhile, the reaction efficiency is obviously improved and the preparation period of the degradable non-woven fabric is shortened due to the use of chlorinated 1-butyl-3-methylimidazole solution as a solvent medium;

3. the structure strength of the tourmaline fiber is improved by combining the chitosan and the modified tourmaline powder in the tourmaline fiber, the processing technology of the chitosan effectively avoids the influence on the environment, and the chitosan has the effects of sustainable development and simple technology, and meanwhile, the chitosan has the effects of bacteriostasis and strong adsorption capacity, so that the non-woven fabric has the effect of effectively combining bagasse fiber, cotton fiber and wheat straw fiber;

4. the tourmaline raw material is dried for multiple times, and in the repeated drying, alcohol, deionized water and dimethylaminoethyl methacrylate are respectively adopted, the temperature is gradually increased every time, so that the effect of rapid drying is achieved, and when the alcohol is attached to the surface and the inner side of the tourmaline raw material, the surface of the tourmaline is further cleaned through drying, so that the retention of impurities is avoided; the deionized water is used for cleaning the interior of the tourmaline raw material, so that alcohol retention is avoided; after being dried, the dimethylamino ethyl methacrylate is combined with bagasse fibers, cotton fibers and wheat straw fibers to further improve the hydrophilicity, the adhesiveness and the heat solidity of the degradable non-woven fabric.

Detailed Description

Example one

A degradable non-woven fabric comprises the following components in parts by weight: 22 parts of bagasse fibers, 38 parts of cotton fibers, 18 parts of wheat straw fibers and 12 parts of tourmaline fibers.

Wherein:

the bagasse fiber is obtained by crushing bagasse by a crusher, screening by a screen, washing, drying, putting the dried bagasse into a chlorinated 1-butyl-3-methylimidazole solution as a solvent medium, and carrying out covalent bond bonding with a side chain group of papain.

The cotton fiber is obtained by sequentially crushing, washing and drying raw material cotton by a crusher; and the washing adopts essential oil and water in a weight ratio of 5:95 as a detergent.

The wheat straw fiber is obtained by cutting, screening and washing wheat straw in sequence, drying, pre-hydrolyzing under the pressure of 1.2MPa, the temperature of 145 ℃ and the liquid ratio of 1:5, and washing and bleaching the hydrolyzed wheat straw.

The method for obtaining the tourmaline fiber comprises the following steps of: 12, dissolving chitosan in 10 mass percent acetic acid solution for decalcification, then carrying out deaeration and filtration processes on the acetic acid solution, adding the filtered chitosan into sodium hydroxide solution for deproteinization, and controlling the concentration of sodium hydroxide to be 0.1 mol/L; and finally, removing ethyl ester from the deproteinized chitosan in the cleaning of an acetic acid solution to form a spinning solution in sodium acetate, and placing the modified tourmaline powder into the spinning solution to be solidified into filaments by adopting calcium chloride.

The preparation method of the modified tourmaline powder comprises the steps of crushing a tourmaline raw material by a crusher, ball-milling the crushed tourmaline raw material to 400 meshes, drying, carrying out air flow crushing and air flow classification, and obtaining the modified tourmaline powder with the average particle size of 35 μm. In the preparation method of the modified tourmaline powder, the adopted drying process comprises primary drying, secondary drying and tertiary drying, wherein the primary drying is to put the ball-milled tourmaline raw material into alcohol and take out, and then dry the ball-milled tourmaline raw material for 10min at 220 ℃; the secondary drying is to put the tourmaline raw material which is dried for the first time into deionized water and take out, and then dry the tourmaline raw material for 15min at 260 ℃; and the third drying is to put the tourmaline raw material which is dried for the second time into dimethylaminoethyl methacrylate and take out, and then dry the tourmaline raw material at 280 ℃ for 6 min.

The invention also provides a preparation method of the degradable non-woven fabric, which comprises the following steps:

step 1, taking 22 parts of bagasse fibers, 38 parts of cotton fibers, 18 parts of wheat straw fibers and 12 parts of tourmaline fibers in parts by weight, firstly adding the tourmaline fibers and the bagasse fibers into deionized water, uniformly stirring, then sequentially adding the cotton fibers and the wheat straw fibers, and uniformly stirring to form fiber slurry;

step 2, adding polyvinyl alcohol into the fiber slurry, wherein the weight ratio of the added polyvinyl alcohol to the fiber slurry is 1: 30, obtaining a non-woven fabric primary material by adopting an electrostatic spinning process, and then performing line pressing treatment and cutting to obtain the antibacterial degradable cotton towel.

Example two

A degradable non-woven fabric comprises the following components in parts by weight: 25 parts of bagasse fibers, 42 parts of cotton fibers, 19 parts of wheat straw fibers and 14 parts of tourmaline fibers.

Wherein:

the bagasse fiber is obtained by crushing bagasse by a crusher, screening by a screen, washing, drying, putting the dried bagasse into a chlorinated 1-butyl-3-methylimidazole solution as a solvent medium, and carrying out covalent bond bonding with a side chain group of papain.

The cotton fiber is obtained by sequentially crushing, washing and drying raw material cotton by a crusher; and the washing adopts essential oil and water in a weight ratio of 5:95 as a detergent.

The wheat straw fiber is obtained by cutting, screening and washing wheat straw in sequence, drying, pre-hydrolyzing under the pressure of 1.3MPa, the temperature of 151 ℃ and the liquid ratio of 1:5, and washing and bleaching the hydrolyzed wheat straw.

The method for obtaining the tourmaline fiber comprises the following steps of: 6, dissolving chitosan in 10 mass percent acetic acid solution for decalcification, then carrying out deaeration and filtration processes on the acetic acid solution, adding the filtered chitosan into sodium hydroxide solution for deproteinization, and controlling the concentration of sodium hydroxide to be 0.1 mol/L; and finally, removing ethyl ester from the deproteinized chitosan in the cleaning of an acetic acid solution to form a spinning solution in sodium acetate, and placing the modified tourmaline powder into the spinning solution to be solidified into filaments by adopting calcium chloride.

The preparation method of the modified tourmaline powder comprises the steps of crushing a tourmaline raw material by a crusher, ball-milling the crushed tourmaline raw material to 400 meshes, drying, carrying out air flow crushing and air flow classification, and obtaining the modified tourmaline powder with the average particle size of 79 microns. In the preparation method of the modified tourmaline powder, the adopted drying process comprises primary drying, secondary drying and tertiary drying, wherein the primary drying is to put the ball-milled tourmaline raw material into alcohol and take out, and then dry the ball-milled tourmaline raw material for 10min at 220 ℃; the secondary drying is to put the tourmaline raw material which is dried for the first time into deionized water and take out, and then dry the tourmaline raw material for 15min at 260 ℃; and the third drying is to put the tourmaline raw material which is dried for the second time into dimethylaminoethyl methacrylate and take out, and then dry the tourmaline raw material at 280 ℃ for 6 min.

The invention also provides a preparation method of the degradable non-woven fabric, which comprises the following steps:

step 1, taking 25 parts of bagasse fibers, 42 parts of cotton fibers, 19 parts of wheat straw fibers and 14 parts of tourmaline fibers according to parts by weight, firstly adding the tourmaline fibers and the bagasse fibers into deionized water, uniformly stirring, then sequentially adding the cotton fibers and the wheat straw fibers, and uniformly stirring to form fiber slurry;

step 2, adding polyvinyl alcohol into the fiber slurry, wherein the weight ratio of the added polyvinyl alcohol to the fiber slurry is 1: 20, obtaining a non-woven fabric primary material by adopting an electrostatic spinning process, and then performing line pressing treatment and cutting to obtain the antibacterial degradable cotton towel.

EXAMPLE III

A degradable non-woven fabric comprises the following components in parts by weight: 28 parts of bagasse fibers, 46 parts of cotton fibers, 20 parts of wheat straw fibers and 16 parts of tourmaline fibers.

Wherein:

the bagasse fiber is obtained by crushing bagasse by a crusher, screening by a screen, washing, drying, putting the dried bagasse into a chlorinated 1-butyl-3-methylimidazole solution as a solvent medium, and carrying out covalent bond bonding with a side chain group of papain.

The cotton fiber is obtained by sequentially crushing, washing and drying raw material cotton by a crusher; and the washing adopts essential oil and water in a weight ratio of 5:95 as a detergent.

The wheat straw fiber is obtained by cutting, screening and washing wheat straw in sequence, drying, pre-hydrolyzing under the pressure of 1.4MPa, the temperature of 160 ℃ and the liquid ratio of 1:5, and washing and bleaching the hydrolyzed wheat straw.

The method for obtaining the tourmaline fiber comprises the following steps of: 4, dissolving chitosan in 10 mass percent acetic acid solution for decalcification, then carrying out deaeration and filtration processes on the acetic acid solution, adding the filtered chitosan into sodium hydroxide solution for deproteinization, and controlling the concentration of sodium hydroxide to be 0.1 mol/L; and finally, removing ethyl ester from the deproteinized chitosan in the cleaning of an acetic acid solution to form a spinning solution in sodium acetate, and placing the modified tourmaline powder into the spinning solution to be solidified into filaments by adopting calcium chloride.

The preparation method of the modified tourmaline powder comprises the steps of crushing a tourmaline raw material by a crusher, ball-milling the crushed tourmaline raw material to 400 meshes, drying, carrying out air flow crushing and air flow classification, and obtaining the modified tourmaline powder with the average particle size of 149 microns. In the preparation method of the modified tourmaline powder, the adopted drying process comprises primary drying, secondary drying and tertiary drying, wherein the primary drying is to put the ball-milled tourmaline raw material into alcohol to be taken out, and then to be dried for 10min at 220 ℃; the secondary drying is to put the tourmaline raw material which is dried for the first time into deionized water and take out, and then dry the tourmaline raw material at 260 ℃ for 15 min; and the third drying is to put the tourmaline raw material which is dried for the second time into dimethylaminoethyl methacrylate and take out, and then dry the tourmaline raw material at 280 ℃ for 6 min.

The invention also provides a preparation method of the degradable non-woven fabric, which comprises the following steps:

step 1, taking 28 parts of bagasse fibers, 46 parts of cotton fibers, 20 parts of wheat straw fibers and 16 parts of tourmaline fibers according to parts by weight, firstly adding the tourmaline fibers and the bagasse fibers into deionized water, uniformly stirring, then sequentially adding the cotton fibers and the wheat straw fibers, and uniformly stirring to form fiber slurry;

step 2, adding polyvinyl alcohol into the fiber slurry, wherein the weight ratio of the added polyvinyl alcohol to the fiber slurry is 4: 55, obtaining a non-woven fabric primary material by adopting an electrostatic spinning process, and then obtaining the antibacterial degradable cotton towel after line pressing and cutting.

Comparative example 1

In comparison to example 2, no bagasse fiber was added in comparative example 1.

Comparative example 2

In comparison to example 2, the tourmaline fibers in comparative example 2 were not added.

The degradable nonwoven fabrics of examples 1 to 3 and comparative examples 1 to 2 were subjected to performance tests, and the test results were as follows:

TABLE one Performance test result for examples 1-3 and comparative examples 1-2

In summary, as can be seen from table one, the tourmaline powder in the tourmaline fiber has an electric polarization phenomenon by combining the bagasse fiber, the cotton fiber, the wheat straw fiber and the tourmaline fiber, so that the tourmaline fiber is in an unstable state that one end generates a positive electrode and the other end generates a negative electrode, thereby generating a potential difference to ionize moisture in the surrounding air to generate negative ions, and realizing the effect of remarkably improving the bacteriostatic function by emitting far infrared rays; the heat stability of the degradable non-woven fabric is obviously improved by combining covalent bonds in bagasse fibers with papain, and the degradable non-woven fabric has the characteristic of oil absorption because the degradable non-woven fabric is mainly made of bagasse, the combination stability is obviously improved when the degradable non-woven fabric is combined with cotton fibers, wheat straw fibers and tourmaline fibers, and meanwhile, the reaction efficiency is obviously improved and the preparation period of the degradable non-woven fabric is shortened because 1-butyl-3-methylimidazole chloride solution is used as a solvent medium; the structure strength of the tourmaline fiber is improved by combining the chitosan and the modified tourmaline powder in the tourmaline fiber, the processing technology of the chitosan effectively avoids the influence on the environment, and the chitosan has the effects of sustainable development and simple technology, and meanwhile, the chitosan has the effects of bacteriostasis and strong adsorption capacity, so that the non-woven fabric has the effect of effectively combining bagasse fiber, cotton fiber and wheat straw fiber; meanwhile, the tourmaline raw material is dried for multiple times, and in the multiple times of drying, alcohol, deionized water and dimethylaminoethyl methacrylate are respectively adopted, the temperature is gradually increased every time, so that the effect of quick drying is achieved, and when the alcohol is attached to the surface and the inner side of the tourmaline raw material, the surface of the tourmaline is further cleaned through drying, so that the retention of impurities is avoided; deionized water is used for cleaning the interior of the tourmaline raw material, so that alcohol retention is avoided; after being dried, the dimethylaminoethyl methacrylate is combined with bagasse fibers, cotton fibers and wheat straw fibers to further improve the hydrophilicity, the adhesiveness and the heat solidity of the degradable non-woven fabric.

References in this application to "first," "second," "third," "fourth," etc., if any, are intended to distinguish between similar elements and not necessarily to describe a particular order or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those described. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, or apparatus.

It should be noted that the descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific implementation and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.