Cotton fiber and rice hull regenerated fiber blended fabric, preparation method and application

Abstract

The invention discloses a cotton fiber rice hull regenerated fiber blended fabric, a preparation method and application, the preparation method comprises the following steps: crushing rice hulls, soaking the crushed rice hulls in a sodium hydroxide solution with the mass fraction of 3-5% for 2-3 h, washing the rice hulls to be neutral, and drying the rice hulls; carrying out biological enzymolysis, squeezing, filtering and high-pressure homogenization on the pretreated rice hulls to obtain rice hull regenerated fibers; combed cotton fibers are selected and mixed with the rice hull regenerated fibers according to the mass ratio of 4: (5.9-6.1), and blended yarn is spun through the procedures of blowing, cotton carding, drawing, roving and spinning in sequence; weaving the blended yarns into grey cloth, desizing, boiling off, bleaching, softening and finishing, and shaping to obtain the blended fabric. The problem that a single rice hull fiber fabric is poor in hand feeling is solved through scientific blending, the blended fabric has the characteristics of skin friendliness, breathability and degradability, high-value utilization of agricultural waste is achieved, and the blended fabric is suitable for production of underwear, homewear and other textile products.

Description

Technical Field

[0001] This invention relates to the field of textile materials technology, specifically to a cotton fiber-rice husk recycled fiber blended fabric, its preparation method, and its application. Background Technology

[0002] With the popularization of green and environmentally friendly concepts, bio-based regenerated fibers have become an important development direction for the upgrading of textile materials due to their core advantages of renewable resources and biodegradable products. In particular, in the field of intimate textile products such as underwear and homewear, the market demand for environmentally friendly, skin-friendly and breathable fabrics is becoming increasingly urgent.

[0003] Traditional raw materials for manufacturing cotton fabrics are mainly divided into two categories: pure cotton and chemical fibers. While pure cotton fabrics can meet the needs of skin-friendly materials, cotton cultivation involves high water consumption and large land area requirements, and the sustainability of raw material supply needs to be improved due to limitations in land resources and climate conditions. Chemical fiber fabrics, on the other hand, have defects such as poor breathability and insufficient moisture absorption, and most chemical fiber products are difficult to degrade naturally, which can easily cause microplastic pollution in the environment.

[0004] Rice husks are a major agricultural byproduct of the rice processing industry. As a major rice-producing country, my country has a huge annual output of rice husks. They are mainly composed of natural high-molecular substances such as cellulose, hemicellulose, and lignin. They are a high-quality biomass raw material for extracting recycled textile fibers. Realizing their high-value utilization can not only solve the environmental problem of agricultural waste accumulation, but also provide new renewable raw materials for the textile industry, which meets the development needs of bio-based textile materials.

[0005] However, the development and application of recycled rice husk fiber still faces many technical bottlenecks: on the one hand, the existing rice husk fiber extraction technology has the problem of incomplete desiliconization. The silica contained in rice husk will result in low strength and poor flexibility of the extracted fiber, making it difficult to spin and form, and failing to meet the basic requirements of textile processing; on the other hand, fabrics made from single rice husk fiber have problems such as rough hand feel, insufficient elasticity and poor skin-friendliness, making it difficult to directly apply to the production of intimate products such as underwear and homewear.

[0006] Scientific blending of recycled rice husk fibers with cotton fibers can leverage the breathability and environmental friendliness of rice husk fibers while utilizing the skin-friendly properties of cotton fibers to optimize fabric texture. However, currently, there is a lack of mature blending ratios and process parameters to support this approach. Therefore, there is an urgent need to develop a method for preparing cotton-rice husk recycled fiber blended fabrics, optimizing the blending ratios and overall process parameters to address the technical challenges of applying recycled rice husk fibers to intimate apparel fabrics. This would provide the textile industry with environmentally friendly and high-quality new fabrics, while simultaneously enabling the high-value utilization of agricultural waste and promoting the green and coordinated development of the textile industry and agriculture. Summary of the Invention

[0007] The purpose of this invention is to provide a cotton fiber-rice hull recycled fiber blended fabric, its preparation method, and its application. By optimizing the blending ratio and process parameters, the problem of poor hand feel of single rice hull fiber fabric is solved, and a skin-friendly, breathable, and biodegradable blended underwear fabric is prepared, which is suitable for the market positioning and quality requirements of underwear and homewear textile products.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A method for preparing a blended fabric of cotton fiber and rice husk recycled fiber includes the following steps:

[0010] S1. Rice husk pretreatment: After crushing the rice husks, soak them in a 3%-5% sodium hydroxide solution for 2-3 hours, rinse until neutral, and then dry.

[0011] S2. Extraction of regenerated rice husk fiber: The pretreated rice husk is subjected to enzymatic hydrolysis, pressing and filtration, and high-pressure homogenization to obtain regenerated rice husk fiber.

[0012] S3. Cotton-rice hull fiber blended yarn: Select combed cotton fiber and mix it with rice hull recycled fiber at a mass ratio of 4:5.9-6.1. Then, through opening, carding, drawing, roving and spinning processes, the blended yarn is spun into a blended yarn.

[0013] S4. Fabric weaving and finishing: The blended yarn is woven into a greige fabric, which is then desized, scouring, bleaching, softening, and setting to obtain the blended fabric.

[0014] As a further embodiment of the present invention, in step S1, the particle size of the crushed rice husk is 20-40 mesh, the soaking temperature of the sodium hydroxide solution is 60-80℃, and the moisture content of the dried rice husk is controlled at 8%-10%.

[0015] As a further embodiment of the present invention, in step S2, the biological enzyme preparation is a mixture of cellulase and xylanase in a mass ratio of 2:0.9-1.1, and the amount of biological enzyme preparation added is 1%-2% of the mass of rice husk; the process conditions for biological enzymatic hydrolysis are: pH value 4.5-5.5, temperature 40-50℃, and enzymatic hydrolysis time 4-6h; the pressure of high-pressure homogenization is 30-40MPa, and the number of homogenization treatments is 1-2 times.

[0016] As a further embodiment of the present invention, the fineness of the combed cotton fiber selected in step S3 is 1.3-1.5 dtex and the fiber length is 30-32 mm; the drawing process consists of 3 drawing processes with a draft ratio of 1.2-1.5:1, the twist coefficient of the roving process is 80-90, and the twist coefficient of the spinning process is 320-350; the linear density of the spun blended yarn is 18-24 tex.

[0017] As a further embodiment of the present invention, in step S4, the blended yarn is woven into a greige fabric using a weft plain knit structure; the softening finishing uses an organosilicon softener solution with a mass fraction of 2%-3%, and the greige fabric is soaked in the solution for 20-30 minutes at a soaking temperature of 30-40°C.

[0018] As a further embodiment of the present invention, the temperature of the shaping process in step S4 is 120-130℃, and the shaping time is 3-5 minutes.

[0019] A cotton-rice husk-regenerated fiber blended fabric prepared by the aforementioned method, wherein the blended fabric has a breaking strength ≥2.5cN / dtex, an air permeability ≥80mm / s, and is biodegradable.

[0020] An application of a blended fabric of cotton fiber and rice husk recycled fiber in underwear and loungewear textile products.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention employs a combined process of "chemical pretreatment + biological enzymatic hydrolysis + high-pressure homogenization" to achieve efficient desilicification and quality improvement of rice husk fiber, effectively enhancing fiber fineness and strength. Combined with a precise quality blending ratio of 4:5.9-6.1 of combed cotton fiber, it fundamentally solves the technical defects of single rice husk fiber fabrics, such as rough hand feel, insufficient elasticity, and inability to be directly used in the production of close-fitting textile products. At the same time, it avoids the problem of difficult spinning of pure rice husk fiber, enabling the high-value transformation of agricultural waste rice husk into textile-grade fiber.

[0023] 2. The cotton-rice hull recycled fiber blended fabric prepared by this invention has a breaking strength ≥2.5cN / dtex, an air permeability ≥80mm / s, and skin-friendliness comparable to pure cotton fabric. It also combines the dual advantages of rice hull fiber's breathability and environmental friendliness with cotton fiber's softness and skin-friendliness. Furthermore, the fabric is biodegradable and poses no risk of microplastic pollution. After shaping and softening, the fabric has a smooth hand feel and is free from pilling, fully meeting the stringent quality requirements for skin-friendliness, breathability, and durability of intimate textile products such as underwear and loungewear.

[0024] 3. This invention precisely defines the process parameters for the entire process of rice husk pretreatment, fiber extraction, blending into yarn, and weaving finishing. It clarifies the key indicators such as material ratio, temperature, time, and pressure for each process. The process steps are clear and the parameters are controllable. There are no complex or special equipment requirements. It can be directly connected to existing textile production lines for industrial-scale production, ensuring the stability and consistency of fabric product quality.

[0025] 4. This invention uses rice husks, a byproduct of rice processing, as a raw material for recycled fibers, which significantly reduces the textile raw material dependence on crops such as cotton, alleviates the resource pressure of high water consumption and high land occupation in cotton planting, and realizes the resource utilization and reduction of agricultural waste. The introduction of rice husk recycled fibers effectively reduces the raw material cost of fabric production, complements cotton fibers, and provides technical support for expanding high-performance, cost-effective, green and environmentally friendly underwear and homewear product lines. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a process for preparing a blended fabric of cotton fiber and rice husk recycled fiber. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] A method for preparing a blended fabric of cotton fiber and rice husk recycled fiber includes the following steps:

[0030] S1. Select dry, mold-free rice husks, crush them to a particle size of 30 mesh, place the crushed rice husks in a 4% sodium hydroxide solution, and soak them at 70℃ for 2.5 hours to complete the desilication and preliminary delignin treatment; after soaking, rinse with clean water until neutral, and dry to a moisture content of 9%;

[0031] S2. Extraction of regenerated rice husk fiber: The pretreated rice husks are placed in a reaction vessel, and 1.5% of the rice husk mass of biological enzyme preparation (the mass ratio of cellulase to xylanase is 2:0.9) is added. The pH value is adjusted to 5.0, and enzymatic hydrolysis is carried out at a temperature of 45℃ for 5 hours. After enzymatic hydrolysis, the mixture is pressed and filtered to obtain crude rice husk fiber. The crude fiber is placed in a high-pressure homogenizer and homogenized once at a pressure of 35MPa to obtain regenerated rice husk fiber with a fiber length of 4mm and a fineness of 1.3dtex.

[0032] S3. Cotton-rice hull fiber blended yarn: Select combed cotton fiber with a fineness of 1.4 dtex and a length of 31 mm, and mix it with the above-mentioned rice hull recycled fiber at a mass ratio of 4:5.9; and then process it through opening, carding, three drawing processes (drawing ratio 1.2-1.5:1), roving (twist coefficient 85), and spinning (twist coefficient 330) to produce a cotton-rice hull fiber blended yarn with a linear density of 21 tex.

[0033] S4. Fabric weaving and finishing: The blended yarn is woven into a greige fabric using a plain weave structure; the greige fabric is then desized, scoured, and bleached in sequence; subsequently, the greige fabric is immersed in a 2.5% (w / w) silicone softener solution at 35°C for 25 minutes to complete the softening process; after finishing, it is dried and then set at 125°C for 4 minutes to finally obtain a cotton fiber-rice husk recycled fiber blended fabric.

[0034] According to professional testing, the blended fabric prepared in this embodiment has a breaking strength of 2.8 cN / dtex, an air permeability of 85 mm / s, good skin-friendliness, and no pilling. All performance indicators meet the quality requirements of underwear and loungewear products.

[0035] Example 2

[0036] A method for preparing a blended fabric of cotton fiber and rice husk recycled fiber includes the following steps:

[0037] S1. Select dry, mold-free rice husks, crush them to a particle size of 20 mesh, place the crushed rice husks in a 3% sodium hydroxide solution, and soak them at 60℃ for 3 hours to complete the desilication and preliminary delignin treatment; after soaking, rinse with water until neutral, and dry to a moisture content of 8%;

[0038] S2. Extraction of regenerated rice husk fiber: The pretreated rice husk is placed in a reaction vessel, and 1% of the mass of the rice husk bio-enzyme preparation (the mass ratio of cellulase to xylanase is 2:1) is added. The pH value is adjusted to 4.5, and enzymatic hydrolysis is carried out at a temperature of 40℃ for 6 hours. After enzymatic hydrolysis, the mixture is pressed and filtered to obtain crude rice husk fiber. The crude fiber is placed in a high-pressure homogenizer and homogenized twice at a pressure of 30MPa to obtain regenerated rice husk fiber with a fiber length of 5mm and a fineness of 1.5dtex.

[0039] S3. Cotton-rice hull fiber blended yarn: Select combed cotton fibers with a fineness of 1.3-1.5 dtex and a length of 30-32 mm, and mix them with the above-mentioned rice hull recycled fibers at a mass ratio of 4:6; then process them sequentially through opening, carding, three drawing processes (drawing ratio 1.2-1.5:1), roving (twist coefficient 80), and spinning (twist coefficient 320) to produce a cotton-rice hull fiber blended yarn with a linear density of 24 tex;

[0040] S4. Fabric weaving and finishing: The blended yarn is woven into a greige fabric using a plain weave structure; the greige fabric is then desized, scalded, and bleached in sequence; subsequently, the greige fabric is soaked in a 2% (w / w) silicone softener solution at 30°C for 30 minutes to complete the softening process; after finishing, it is dried and then set at 120°C for 5 minutes to finally obtain a cotton fiber-rice husk recycled fiber blended fabric.

[0041] According to professional testing, the blended fabric prepared in this embodiment has a breaking strength of 2.5 cN / dtex, an air permeability of 80 mm / s, good skin-friendliness, and no pilling. All performance indicators meet the quality requirements of underwear and loungewear products.

[0042] Example 3

[0043] A method for preparing a blended fabric of cotton fiber and rice husk recycled fiber includes the following steps:

[0044] S1. Select dry, mold-free rice husks, crush them to a particle size of 40 mesh, place the crushed rice husks in a 5% sodium hydroxide solution, and soak them at 80℃ for 2.5 hours to complete the desilication and preliminary delignin treatment; after soaking, rinse with clean water until neutral, and dry to a moisture content of 10%;

[0045] S2. Extraction of regenerated rice husk fiber: The pretreated rice husk is placed in a reaction vessel, and 2% (by weight of rice husk) of a biological enzyme preparation (the mass ratio of cellulase to xylanase is 2:1.1) is added. The pH value is adjusted to 5.5, and enzymatic hydrolysis is carried out at 50℃ for 4 hours. After enzymatic hydrolysis, the mixture is pressed and filtered to obtain crude rice husk fiber. The crude fiber is then placed in a high-pressure homogenizer and homogenized once at a pressure of 40MPa to obtain regenerated rice husk fiber with a fiber length of 3mm and a fineness of 1.2dtex.

[0046] S3. Cotton-rice hull fiber blended yarn: Select combed cotton fiber with a fineness of 1.5 dtex and a length of 32 mm, and mix it with the above-mentioned rice hull recycled fiber at a mass ratio of 4:6.1; and then process it through opening, carding, three drawing processes (drawing ratio 1.2-1.5:1), roving (twist coefficient 90), and spinning (twist coefficient 350) to produce a cotton-rice hull fiber blended yarn with a linear density of 18 tex.

[0047] S4. Fabric weaving and finishing: The blended yarn is woven into a greige fabric using a plain weave structure; the greige fabric is then desized, scalded, and bleached in sequence; subsequently, the greige fabric is soaked in a 3% (w / w) silicone softener solution at 40°C for 20 minutes to complete the softening process; after finishing, it is dried and then set at 130°C for 3 minutes to finally obtain a cotton fiber-rice husk recycled fiber blended fabric.

[0048] According to professional testing, the blended fabric prepared in this embodiment has a breaking strength of 3.0 cN / dtex, an air permeability of 90 mm / s, good skin-friendliness, and no pilling or shedding. All performance indicators meet the quality requirements of underwear and loungewear products.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing a blended fabric of cotton fiber and rice husk recycled fiber, characterized in that, Includes the following steps: S1. Rice husk pretreatment: After crushing the rice husks, soak them in a 3%-5% sodium hydroxide solution for 2-3 hours, rinse until neutral, and then dry. S2. Extraction of regenerated rice husk fiber: The pretreated rice husk is subjected to enzymatic hydrolysis, pressing and filtration, and high-pressure homogenization to obtain regenerated rice husk fiber. S3. Cotton-rice hull fiber blended yarn: Select combed cotton fiber and mix it with rice hull recycled fiber at a mass ratio of 4:5.9-6.

1. Then, through opening, carding, drawing, roving and spinning processes, the blended yarn is spun into a blended yarn. S4. Fabric weaving and finishing: The blended yarn is woven into a greige fabric, which is then desized, scouring, bleaching, softening, and setting to obtain the blended fabric.

2. The method for preparing a cotton fiber-rice husk recycled fiber blended fabric according to claim 1, characterized in that, In step S1, the particle size of the crushed rice husks is 20-40 mesh, the soaking temperature of the sodium hydroxide solution is 60-80℃, and the moisture content of the dried rice husks is controlled at 8%-10%.

3. The method for preparing a cotton fiber-rice husk recycled fiber blended fabric according to claim 1, characterized in that, In step S2, the bio-enzyme preparation is a mixture of cellulase and xylanase in a mass ratio of 2:0.9-1.1, and the amount of bio-enzyme preparation added is 1%-2% of the mass of rice husk. The process conditions for bio-enzymatic hydrolysis are: pH value 4.5-5.5, temperature 40-50℃, and hydrolysis time 4-6h. The pressure of high-pressure homogenization is 30-40MPa, and the number of homogenization treatments is 1-2 times.

4. The method for preparing a cotton fiber-rice husk recycled fiber blended fabric according to claim 1, characterized in that, In step S3, the fineness of the combed cotton fiber selected is 1.3-1.5 dtex and the fiber length is 30-32 mm; the drawing process consists of 3 drawing processes with a draft ratio of 1.2-1.5:1; the twist coefficient of the roving process is 80-90; and the twist coefficient of the spinning process is 320-350; the linear density of the spun blended yarn is 18-24 tex.

5. The method for preparing a cotton fiber-rice husk recycled fiber blended fabric according to claim 1, characterized in that, In step S4, the blended yarn is woven into a greige fabric using a plain weave structure; the softening finishing uses a silicone softener solution with a mass fraction of 2%-3%, and the greige fabric is soaked in the solution for 20-30 minutes at a temperature of 30-40℃.

6. The method for preparing a cotton fiber-rice husk recycled fiber blended fabric according to claim 5, characterized in that, The temperature of the setting process in step S4 is 120-130℃, and the setting time is 3-5 minutes.

7. A cotton-rice husk-regenerated fiber blended fabric prepared by the method according to any one of claims 1-6, characterized in that, The blended fabric has a tensile strength ≥2.5cN / dtex, an air permeability ≥80mm / s, and is biodegradable.

8. The application of a blended fabric of cotton fiber and rice husk recycled fiber as described in claim 7 in underwear and loungewear textile products.

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