Bamboo cotton plain double-layer gauze and preparation method thereof

Abstract

The invention relates to the technical field of cloth processing, in particular to bamboo-cotton plain-weave double-layer gauze and a preparation method thereof.The bamboo-cotton plain-weave double-layer gauze is prepared from, by weight, 25-35% of cotton fibers and 65-75% of viscose fibers; the viscose fibers are prepared from the following components in parts by weight: 20-30 parts of bamboo pulp, 10-15 parts of a viscose solution and 5-8 parts of a modifier, and the modifier is obtained by mixing chitin nano whisker crystals, activated carbon and a silane coupling agent. The bamboo-cotton plain-weave double-layer gauze prepared from the compound raw materials has good wear resistance and durability, is not prone to pilling and deformation in the using process, and is good in softness and skin-friendly performance.

Description

Technical Field

[0001] The present application relates to the technical field of cloth processing, and more specifically, to a bamboo-cotton plain weave double-layer gauze and a preparation method thereof. Background Art

[0002] As a special textile, double-layer gauze fabric has been widely used in maternal and child products, underwear, bedding and other fields due to its softness, comfort, moisture absorption, breathability, environmental protection and safety. This fabric was originally derived from medical gauze. After improvement, it not only maintains its original excellent properties, but also improves its scope of application and user experience. However, the cotton double-sided yarn has a low yarn count density, and its stability and wear resistance are relatively poor. Especially during washing and wearing, double-layer gauze fabric is prone to wrinkles and deformation, resulting in a shortened service life. In addition, due to the low yarn count density, the fabric is prone to pilling and hair loss, which not only affects the appearance, but may also cause discomfort to the skin. With the growth of consumer demand for high-quality life, the research and development and production technology of double-layer gauze fabrics are also constantly improving.

[0003] In the existing technology, in order to improve the performance of double-layer gauze fabrics, various methods are usually used to improve their stability and durability. Common methods include increasing yarn count, using high-strength fibers, adding functional coatings, etc. For example, increasing yarn count can improve the overall strength and wrinkle resistance of the fabric; using high-strength fibers such as polyester fibers can enhance the wear resistance of the fabric.

[0004] Although the above method can improve the performance of the double-layer gauze fabric to a certain extent, it still cannot completely solve the problem of poor stability and wear resistance and balloon hair loss. Therefore, how to further improve the stability and wear resistance of the double-layer gauze fabric has become a technical problem to be solved urgently. Summary of the invention

[0005] In order to solve the problems of poor stability, poor wear resistance and easy pilling and hair loss of double-layer yarn, the present application provides a bamboo-cotton plain weave double-layer gauze and a preparation method thereof.

[0006] In the first aspect, the present application provides a bamboo cotton plain weave double-layer gauze, which adopts the following technical solution: A bamboo cotton plain weave double-layer gauze is prepared from the following raw materials in percentage by weight: Cotton fiber 25-35% Viscose 65-75%; The viscose fiber is prepared from the following parts by weight: Bamboo pulp 20-30 parts 10-15 parts of viscose cellulose solution Modifier 5-8 parts The modifier is obtained by mixing chitin nano whiskers, activated carbon and a silane coupling agent.

[0007] By adopting the above technical scheme, the prepared bamboo cotton plain weave double-layer gauze has good wear resistance and durability, is not easy to pilling and deform during use, and has good softness and skin-friendliness.

[0008] The combination of cotton fiber and viscose fiber can form a stable fiber structure, thereby improving the overall stability and durability of the double-layer yarn. The combination of cotton fiber and viscose fiber forms a stable fiber structure, in which cotton fiber has good strength and toughness, while viscose fiber has good softness and elasticity. The combination of the two allows the fabric to maintain a stable shape when subjected to external forces and is not easily deformed.

[0009] The addition of bamboo pulp to viscose fiber further enhances the wear resistance of the fiber, because bamboo pulp itself has good strength and wear resistance. The modifier components such as activated carbon and chitin nanowhiskers in viscose fiber can increase the roughness of the fiber surface and improve the friction coefficient between fibers, thereby further enhancing the wear resistance of the fabric. Chitin nanowhiskers have excellent mechanical properties and biocompatibility, which can enhance the bonding force between fibers and improve the overall strength of the fabric. Activated carbon has an adsorption effect, which can remove tiny particles on the surface of the fabric and reduce the wear caused by dirt and tiny particles. Silane coupling agents can improve the wettability and compatibility of the fiber surface, making the fibers more closely bonded, thereby improving the stability and wear resistance of the fabric. At the same time, silane coupling agents can also improve the weather resistance and chemical stability of the fiber, making the fabric more durable during use.

[0010] In addition, bamboo pulp and cotton fiber have longer fiber lengths and smooth fiber surfaces, making them less likely to pill. At the same time, the addition of modifiers can improve the wettability and compatibility of the fiber surface, making the fibers more tightly bonded and reducing fiber shedding. Activated carbon has an adsorption effect, which can remove tiny particles on the surface of the fabric and reduce pilling and shedding. The mixed use of bamboo pulp, cotton fiber and modifiers can further prevent double-layer yarn from pilling and shedding.

[0011] At the same time, both bamboo fiber and cotton fiber have good moisture absorption and air permeability, which makes the bamboo cotton plain weave double-layer gauze more comfortable to wear and can keep the skin dry and breathable.

[0012] Preferably, the weight ratio of the chitosan nanowhiskers, the activated carbon and the silane coupling agent is (5-8): (2-4): 0.5.

[0013] By adopting the above technical solution, the dosage of chitin nanowhiskers, activated carbon and silane coupling agent is optimized to further improve the strength, abrasion resistance, moisture absorption, air permeability, softness and comfort of viscose fiber.

[0014] Preferably, the viscose fiber is prepared by the following method: 1) subjecting bamboo pulp to alkali impregnation, aging, yellowing, filtering and defoaming to obtain bamboo mucus; 2) Evenly mixing bamboo mucus, viscose cellulose solution and modifier, and then spinning, drawing, refining and drying to obtain viscose fiber.

[0015] By adopting the above technical solutions, the molecular structure of bamboo pulp is optimized and the fiber strength is improved after alkali impregnation, aging, and yellowing. The mixing of viscose cellulose solution and bamboo mucus enables the fiber to form a more compact structure during the spinning process, further enhancing the fiber strength. The addition of chitin nanowhiskers enables the fiber to disperse stress and reduce wear when subjected to external forces. At the same time, the adsorption of activated carbon helps to keep the fiber surface clean and reduce wear caused by dirt and tiny particles.

[0016] Preferably, the viscose cellulose solution is prepared by the following method: Cellulose acetate and polylactic acid are added into a NaOH solution and stirred until they are completely dissolved to prepare a viscose cellulose solution.

[0017] By adopting the above technical scheme, the dissolution process of cellulose acetate and polylactic acid in NaOH solution enables these two polymer materials to be evenly dispersed in the solution to form a stable viscose cellulose solution. At the same time, the molecular chains of cellulose acetate and polylactic acid in the viscose cellulose solution are relatively long, and there is a strong interaction force between the molecules, which makes the viscose fiber obtained after spinning have higher strength and toughness. The high-strength fiber is conducive to improving the stability and wear resistance of the double-layer yarn, and is not easy to deform or wear, so that the fabric can maintain a good state during long-term use. At the same time, cellulose acetate and polylactic acid themselves have certain hygroscopicity and air permeability, which makes the viscose fiber have good comfort performance while maintaining high strength. The double-layer yarn made of this fiber can keep the skin dry and breathable when worn, and improve the comfort of wearing.

[0018] Preferably, the weight ratio of the cellulose acetate to the polylactic acid to the NaOH solution is 1:(2-3):(5-7).

[0019] By adopting the above technical solution, the weight of cellulose acetate, polylactic acid and NaOH solution is optimized, cellulose acetate and polylactic acid dissolve faster, and the polymer chains in the viscose cellulose solution can form a strong interaction force, so that the viscose fiber obtained after spinning has higher strength and toughness, and can maintain good morphological stability and wear resistance during subsequent processing and use.

[0020] Preferably, the degree of polymerization of the polylactic acid is 500-2000.

[0021] By adopting the above technical solution, the degree of polymerization of polylactic acid is optimized, the molecular chain length is moderate, and a relatively stable solution structure can be formed, so that the viscose cellulose solution has a suitable viscosity during the preparation process, which is neither too viscous to affect fluidity nor too thin to affect the spinning effect. At the same time, it is beneficial to the uniformity and continuity of the fiber in the subsequent spinning process and improves the quality of the fiber. And within this range, polylactic acid can form a stronger molecular chain structure, which works together with cellulose acetate to improve the strength and toughness of viscose fiber, so that the fiber can maintain good morphological stability and wear resistance during subsequent processing and use.

[0022] Preferably, the degree of polymerization of the cellulose acetate is 300-1500.

[0023] By adopting the above technical solution, the degree of polymerization of cellulose acetate is optimized, and its molecular chain length is moderate, which can form a relatively stable solution structure and ensure the uniformity of the viscose cellulose solution. In this range, cellulose acetate can form a strong molecular chain structure, which can work together with polylactic acid to improve the strength and toughness of viscose fiber, making the double-sided yarn more stable when subjected to external forces and less prone to deformation or wear.

[0024] Preferably, the cotton fibers include fine-staple cotton and / or long-staple cotton.

[0025] By adopting the above technical solution, the cotton fiber is optimized, and the milkiness, durability, softness and comfort of the double-sided yarn are further improved. Among them, the addition of fine-staple cotton can enhance the overall strength of the fabric and make the gauze more durable. The fibers of long-staple cotton are longer, which can form a tighter and stronger yarn structure, thereby further improving the strength and toughness of the fabric. At the same time, the fibers of fine-staple cotton and long-staple cotton are relatively uniform, and the surface of the gauze made is smooth without obvious unevenness in thickness, which helps to improve the overall beauty of the double-layer yarn and make it more delicate and exquisite.

[0026] Preferably, the average particle size of the activated carbon is 50-300 nm.

[0027] By adopting the above technical solution, the average particle size of activated carbon is optimized so that it can fill the gaps between fibers and increase the bonding force between fibers, thereby improving the overall stability of the fabric and preventing the double-layer yarn from pilling or deformation during use.

[0028] In a second aspect, the present application provides a method for preparing a bamboo cotton plain weave double-layer gauze, using the following technical solution: A method for preparing a bamboo cotton plain weave double-layer gauze, comprising the following preparation steps: S1, spinning the cotton fiber and the viscose fiber through a cotton opening and cleaning process, a cotton carding process, a drawing process, a roving process and a spun yarn process to obtain a mixed yarn; S2, the mixed yarn is carried out double-layer yarn manufacturing with a loom to obtain a bamboo-cotton plain weave double-layer gauze.

[0029] By adopting the above technical scheme, cotton fiber and viscose fiber are fully mixed and evenly distributed in the yarn, making the yarn structure more compact, thereby improving the overall strength and stability of the gauze. At the same time, the uniformity of the mixed yarn helps to reduce the deformation and breakage of the fabric during use, thereby extending its service life. The addition of viscose fiber and the subsequent double-layer yarn manufacturing process improve the wear resistance of the fabric. Viscose fiber itself has a certain wear resistance, and the double-layer structure further enhances the wear resistance of the fabric. Cotton fiber has good moisture absorption and air permeability, which makes the bamboo cotton plain double-layer gauze still have excellent wearing comfort while maintaining high performance. Whether it is used for summer clothing or bedding, it can bring a refreshing wearing experience to users.

[0030] In summary, this application has the following beneficial effects: 1. By introducing a specific proportion of cotton fiber and viscose fiber, the overall structure of the double-layer yarn is enhanced, and the tear resistance is enhanced, thereby improving the stability, durability and wear resistance of the double-layer yarn. At the same time, the addition of the modifier also improves the bonding force between the fibers and reduces the damage of the fabric caused by friction during use. The chitin nanowhiskers in the modifier can enhance the strength and wear resistance of the fiber; the activated carbon has excellent adsorption properties due to its porous structure, which helps to remove odors and keep the fabric fresh; the silane coupling agent acts as a bridge to closely combine inorganic particles such as chitin nanowhiskers and activated carbon with organic fibers, thereby improving the overall performance of the fiber. The addition of cotton fiber allows the fabric to maintain good moisture absorption and breathability, while bamboo pulp also has certain moisture absorption and release properties, so that the fabric still has excellent wearing comfort while maintaining high performance. DETAILED DESCRIPTION Example

[0031] Example 1 A bamboo cotton plain weave double-layer gauze is prepared by the following method: S1, spinning 2.5 kg of cotton fiber and 7.5 kg of viscose fiber through a cotton opening and cleaning process, a cotton carding process, a drawing process, a roving process and a spun yarn process to obtain a mixed yarn; S2, the mixed yarn is carried out double-layer yarn manufacturing with a loom to obtain a bamboo-cotton plain weave double-layer gauze.

[0032] The cotton fiber is fine-staple cotton.

[0033] Viscose fiber is prepared by the following method: 1) 4 kg of bamboo pulp is subjected to alkali impregnation, aging, yellowing, filtering and defoaming to obtain bamboo mucus; 2) The bamboo mucus is mixed evenly with 3 kg of viscose cellulose solution and 0.5 kg of a modifier, and then spun, drawn, refined and dried to obtain viscose fibers.

[0034] The modifier is obtained by mixing chitosan nano whiskers, activated carbon (average particle size is 201-300nm) and silane coupling agent (vinyl triethoxysilane) in a weight ratio of 5:2:0.5.

[0035] The viscose cellulose solution was prepared by the following method: 1 kg of cellulose acetate and 2 kg of polylactic acid were added into 5 kg of NaOH solution (mass fraction 10%) and stirred until they were completely dissolved to prepare a viscose cellulose solution.

[0036] The degree of polymerization of polylactic acid is 500.

[0037] The degree of polymerization of cellulose acetate is 300.

[0038] Example 2 A bamboo cotton plain weave double-layer gauze is prepared by the following method: S1, spinning 3 kg of cotton fiber and 7 kg of viscose fiber through a cotton opening and cleaning process, a cotton carding process, a drawing process, a roving process and a spun yarn process to obtain a mixed yarn; S2, the mixed yarn is carried out double-layer yarn manufacturing with a loom to obtain a bamboo-cotton plain weave double-layer gauze.

[0039] The cotton fiber is long-staple cotton.

[0040] Viscose fiber is prepared by the following method: 1) 5 kg of bamboo pulp is subjected to alkali impregnation, aging, yellowing, filtering and degassing to obtain bamboo mucus; 2) The bamboo mucus is mixed evenly with 2.4 kg of viscose cellulose solution and 0.6 kg of a modifier, and then spun, drawn, refined and dried to obtain viscose fibers.

[0041] The modifier is obtained by mixing chitosan nano whiskers, activated carbon (average particle size is 50-100nm) and silane coupling agent (vinyl tri (β-methoxyethoxy) silane) in a weight ratio of 6:3:0.5.

[0042] The viscose cellulose solution was prepared by the following method: 1 kg of cellulose acetate and 2.5 kg of polylactic acid were added into 6 kg of NaOH solution (mass fraction 12%) and stirred until they were completely dissolved to prepare a viscose cellulose solution.

[0043] The degree of polymerization of polylactic acid is 1200.

[0044] The degree of polymerization of cellulose acetate is 1,000.

[0045] Example 3 A bamboo cotton plain weave double-layer gauze is prepared by the following method: S1, spinning 3.5 kg of cotton fiber and 6.5 kg of viscose fiber through a cotton cleaning process, a carding process, a drawing process, a roving process and a spun yarn process to obtain a mixed yarn; S2, the mixed yarn is carried out double-layer yarn manufacturing with a loom to obtain a bamboo-cotton plain weave double-layer gauze.

[0046] The cotton fibers are fine-staple cotton and long-staple cotton, with a weight ratio of 1:1.

[0047] Viscose fiber is prepared by the following method: 1) 6 kg of bamboo pulp is subjected to alkali impregnation, aging, yellowing, filtering and defoaming to obtain bamboo mucus; 2) The bamboo mucus is mixed evenly with 2 kg of viscose cellulose solution and 0.5 kg of a modifier, and then spun, drawn, refined and dried to obtain viscose fibers.

[0048] The modifier is obtained by mixing chitosan nano whiskers, activated carbon (average particle size is 101-200nm) and silane coupling agent (γ-mercaptopropyl triethoxysilane) in a weight ratio of 8:4:0.5.

[0049] The viscose cellulose solution was prepared by the following method: 1 kg of cellulose acetate and 3 kg of polylactic acid were added into 7 kg of NaOH solution (mass fraction 15%) and stirred until they were completely dissolved to prepare a viscose cellulose solution.

[0050] The degree of polymerization of polylactic acid is 2000.

[0051] The degree of polymerization of cellulose acetate is 1500.

[0052] Example 4 A bamboo cotton plain weave double-layer gauze, the difference between this embodiment and embodiment 1 is that the viscose cellulose solution is prepared by the following method: 1 kg of cellulose acetate was added into 5 kg of NaOH solution (mass fraction 10%) and stirred until it was completely dissolved to prepare a viscose cellulose solution.

[0053] Example 5 A bamboo cotton plain weave double-layer gauze, the difference between this embodiment and embodiment 1 is that the viscose cellulose solution is prepared by the following method: 2.5 kg of polylactic acid was added into 5 kg of NaOH solution (mass fraction 10%) and stirred until it was completely dissolved to prepare a viscose cellulose solution.

[0054] Example 6 A bamboo cotton plain weave double-layer gauze, the difference between this embodiment and embodiment 1 is that the viscose cellulose solution is prepared by the following method: 1 kg of cellulose carbamate and 2.5 kg of polylactic acid were added to 5 kg of NaOH solution (mass fraction 10%) and stirred until they were completely dissolved to prepare a viscose cellulose solution.

[0055] Example 7 A bamboo cotton plain weave double-layer gauze. The difference between this embodiment and embodiment 1 is that the weight ratio of chitosan nano whiskers, activated carbon and silane coupling agent (vinyl triethoxysilane) is 5:5:0.5.

[0056] Example 8 A bamboo-cotton plain weave double-layer gauze. The difference between this embodiment and embodiment 1 is that the degree of polymerization of the polylactic acid is 2500.

[0057] Example 9 A bamboo-cotton plain weave double-layer gauze. The difference between this embodiment and embodiment 1 is that the degree of polymerization of cellulose acetate is 1600.

[0058] Comparative Example Comparative Example 1 A bamboo-cotton plain weave double-layer gauze. The difference between this comparative example and Example 1 is that the modifier is chitosan nanowhisker crystals.

[0059] Comparative Example 2 A bamboo cotton plain weave double-layer gauze. The difference between this comparative example and Example 1 is that the modifier is activated carbon.

[0060] Comparative Example 3 A bamboo cotton plain weave double-layer gauze. The difference between this comparative example and Example 1 is that zinc oxide whiskers are used instead of chitosan nano whiskers.

[0061] Comparative Example 4 A bamboo cotton plain weave double-layer gauze. The difference between this comparative example and Example 1 is that nano silicon dioxide is used instead of activated carbon.

[0062] Comparative Example 5 A bamboo cotton plain weave double-layer gauze. The difference between this comparative example and Example 1 is that talcum powder is used instead of a silane coupling agent.

[0063] Comparative Example 6 A bamboo-cotton plain weave double-layer gauze. The difference between this comparative example and Example 1 is that cotton pulp is used instead of bamboo pulp.

[0064] Test method / test method Strength test: According to GB / T3923.1-2013 "Tensile properties of textile fabrics Part 1: Determination of breaking strength and breaking elongation (strip method)", the tensile mechanical properties are measured. Experimental steps: Cut the sample size to a rectangular sample of 200mm×60mm, the stretching speed is 300mm / min, and the clamping distance is 50mm. During the tensile test, the tensile tester will record the tensile force and tensile length of the sample in real time. After the test is completed, the breaking strength is calculated based on the test results.

[0065] Pilling test: Cut the bamboo cotton plain weave double-layer gauze into a circle with a diameter of 100 cm, and use a disc fabric flat grinding tester to perform a friction test with a weight of 500 g. Rub until the bamboo cotton plain weave double-layer gauze pills or breaks, and record the number of pilling circles.

[0066] Softness test: Tested by fabric style tester, Grade IV, Grade I has the best softness, Grade IV, Grade I has the best softness.

[0067] Wrinkle resistance test: 20 containers of the same size were prepared, and the bamboo cotton plain weave double-layer gauze obtained in the embodiment and the comparative example was placed in the containers respectively, left to stand for 24 hours, and then taken out to observe whether the bamboo cotton plain weave double-layer gauze had wrinkles. The experimental results are shown in Table 1: Table 1 Experimental data of Examples 1-9 and Comparative Examples 1-6 By comparing Example 1 with Comparative Example 1, the breaking strength and the number of broken circles in Comparative Example 1 are greater than those in Example 1, but its softness grade is lower than that in Example 1, and the softness of Example 1 is better; Comparing Example 1 with Comparative Example 2, the breaking strength of Comparative Example 2 is lower than that of Example 1, pilling occurs, and wrinkles appear in the wrinkle resistance test; By comparing Example 1 with Comparative Example 3, the breaking strength of Comparative Example 2 is lower than that of Example 1, pilling occurs, the softness level is lower than that of Example 1, and wrinkles appear in the wrinkle resistance test; Comparing Example 1 with Comparative Example 4, the breaking strength and the number of broken circles in Comparative Example 4 are greater than those in Example 1, but the softness grade is lower than that in Example 1, and the softness of Example 1 is better; By comparing Example 1 with Comparative Example 5, the breaking strength of Comparative Example 5 is less than that of Example 1, the number of broken circles is less than that of Example 1, the grade of softness is less than that of Example 1, and wrinkles appear in the wrinkle resistance test; It can be seen from the experimental data of Example 1 and Comparative Examples 1-5 that the modifier prepared by using chitin nanowhiskers, activated carbon and silane coupling agent can effectively improve the breaking strength, abrasion resistance, softness and wrinkle resistance of the double-layer yarn, and prevent the double-layer yarn from pilling.

[0068] Comparing Example 1 with Comparative Example 6, the breaking strength of Comparative Example 6 is lower than that of Example 1, pilling occurs, the softness level is lower than that of Example 1, and wrinkles appear in the wrinkle resistance test, indicating that the viscose fiber prepared by using bamboo pulp, viscose cellulose solution and modifier can improve the breaking strength, abrasion resistance, softness and wrinkle resistance of the double-layer yarn, and prevent pilling of the double-layer yarn.

[0069] Comparing Example 1 with Examples 4-6, the breaking strength and number of broken circles of Examples 4-6 are both lower than those of Example 1, and the softness level of Examples 5-6 is lower than that of Example 1, indicating that the viscose fiber prepared by the specific formula of the present application can improve the breaking strength, wear resistance and softness of the double-layer yarn.

[0070] Comparing Example 1 with Example 7, the breaking strength and the number of broken circles of Example 7 are both smaller than those of Example 1, indicating that reasonable optimization of the dosage of chitosan nanowhiskers, activated carbon and silane coupling agent is beneficial to improving the breaking strength and wear resistance of the double-layer yarn.

[0071] Comparing Example 1 with Examples 8-9, the breaking strength and the number of broken circles of Example 7 are slightly greater than those of Example 1, but the softness grade of Examples 8-9 is lower than that of Example 1, indicating that optimizing the degree of polymerization of polylactic acid and the degree of polymerization of cellulose acetate is beneficial to improving the softness of the double-layer yarn.

[0072] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A bamboo cotton plain weave double-layer gauze, characterized in that: Prepared from the following raw materials in weight percentage: Cotton fiber 25-35% Viscose fiber 65-75%; The viscose fiber is prepared from the following parts by weight: Bamboo pulp 20-30 parts 10-15 parts of viscose cellulose solution Modifier 5-8 parts The modifier is obtained by mixing chitin nano whiskers, activated carbon and a silane coupling agent.

2. The bamboo cotton plain weave double-layer gauze according to claim 1, characterized in that: The weight ratio of the chitosan nanowhiskers, the activated carbon and the silane coupling agent is (5-8): (2-4): 0.

5.

3. The bamboo cotton plain weave double-layer gauze according to claim 1, characterized in that: The viscose fiber is prepared by the following method: 1) subjecting bamboo pulp to alkali impregnation, aging, yellowing, filtering and defoaming to obtain bamboo mucus; 2) Evenly mix the bamboo mucus, viscose cellulose solution and modifier, and then spin, draw, scour and dry to obtain viscose fiber.

4. The bamboo cotton plain weave double-layer gauze according to claim 1, characterized in that: The viscose cellulose solution is prepared by the following method: Cellulose acetate and polylactic acid are added into NaOH solution and stirred until they are completely dissolved to prepare viscose cellulose solution.

5. The bamboo cotton plain weave double-layer gauze according to claim 4, characterized in that: The weight ratio of the cellulose acetate to the polylactic acid to the NaOH solution is 1:(2-3):(5-7).

6. The bamboo cotton plain weave double-layer gauze according to claim 4, characterized in that: The polymerization degree of the polylactic acid is 500-2000.

7. The bamboo cotton plain weave double-layer gauze according to claim 4, characterized in that: The polymerization degree of the cellulose acetate is 300-1500.

8. The bamboo cotton plain weave double-layer gauze according to claim 1, characterized in that: The cotton fiber includes fine-staple cotton and / or long-staple cotton.

9. The bamboo cotton plain weave double-layer gauze according to claim 1, characterized in that: The average particle size of the activated carbon is 50-300 nm.

10. A method for preparing the bamboo cotton plain weave double-layer gauze according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: S1, spinning the cotton fiber and the viscose fiber through a cotton opening and cleaning process, a cotton carding process, a drawing process, a roving process and a spun spinning process to obtain a mixed yarn; S2, the mixed yarn is carried out double-layer yarn manufacturing with a loom to obtain a bamboo-cotton plain weave double-layer gauze.

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