Needle-punched cotton felt containing plant functional fibers and preparation method of needle-punched cotton felt

Abstract

The invention discloses a needle-punched cotton felt containing plant functional fibers and a preparation method of the needle-punched cotton felt, and belongs to the technical field of non-woven materials. The needle-punched cotton felt is composed of jute fibers, polyester staple fibers, auxiliary agent type deodorization fibers and 4080 low-melting-point fibers according to specific mass percent. Wherein the jute fibers are subjected to pretreatment of chemical degumming and soft modification treatment; the assistant type deodorizing fiber is a fiber prepared by blending and spinning a composite deodorizing assistant and a modified polymer matrix; the composite deodorizing auxiliary agent comprises nano zinc oxide, a chitosan derivative and zeolite powder; the modified polymer matrix is a polymer matrix modified by a compatilizer. The needle-punched cotton felt disclosed by the invention has excellent flexibility, high mechanical strength and an efficient and lasting deodorization function.

Description

Technical Field

[0001] This invention relates to the field of nonwoven materials technology, specifically to a needle-punched cotton felt containing plant functional fibers with deodorizing function and high strength and toughness, and its preparation method. Background Technology

[0002] Jute fiber, as a natural cellulose fiber, has advantages such as wide availability, renewability, and biodegradability, and has great potential for application in the nonwoven field. Needle-punched cotton felt, due to its excellent air permeability and cushioning, is widely used in packaging, construction, automotive interiors, and other scenarios. However, existing jute fiber-containing needle-punched cotton felts have three major shortcomings: First, jute fibers are coarse and stiff with poor cohesion, resulting in insufficient strength and a rough feel; second, they lack functionality and cannot meet the deodorization requirements of automotive interiors, home furnishings, and other scenarios; and third, the inter-fiber adhesion mainly relies on needle-punching entanglement, resulting in limited strength stability.

[0003] In terms of achieving deodorization, existing technologies mainly prepare deodorizing fibers through blend spinning, finishing, and graft copolymerization. Blending spinning involves directly spinning deodorizing agents after blending them with polymer chips. This method is simple to operate and has low production costs, but it suffers from uneven dispersion and agglomeration of the deodorizing agents in the fibers, leading to unstable deodorization effects. Furthermore, the poor compatibility between the agents and the polymer matrix severely affects the mechanical properties of the fibers. Finishing methods involve attaching deodorizing agents to the fiber surface through impregnation or coating. This method offers flexibility, but the bonding force between the deodorizing agents and fibers is weak, making them prone to detachment during washing or use, resulting in poor durability of the deodorizing function. Graft copolymerization involves chemically grafting deodorizing functional groups onto the fiber molecular chain. While it can improve deodorization durability, the reaction conditions are harsh, the process is complex, and it generates some environmental pollution, resulting in high production costs and hindering large-scale industrial application. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a needle-punched cotton felt containing plant functional fibers and its preparation method. This needle-punched cotton felt achieves a good balance between mechanical properties, hand feel, and deodorizing function.

[0005] This invention provides the following technical solution: In a first aspect, the present invention provides a needle-punched cotton felt containing plant functional fibers, comprising the following raw materials by weight percentage: 30%-50% jute fiber, 15%-30% polyester staple fiber, 5%-15% auxiliary deodorizing fiber, and 10%-20% 4080 low melting point fiber; The jute fiber undergoes pretreatment, which includes chemical degumming and softening modification. The deodorizing fiber with additives is a fiber obtained by blending and spinning a composite deodorizing additive with a modified polymer matrix; the composite deodorizing additive includes nano zinc oxide, chitosan derivatives and zeolite powder; the modified polymer matrix is ​​a polymer matrix modified with a compatibilizer.

[0006] Furthermore, the mass ratio of the nano zinc oxide, chitosan derivative and zeolite powder is (3-5):(2-4):(1-3).

[0007] Preferably, the jute fiber has a length of 30-50 mm and a linear density of 2-5 dtex; the polyester staple fiber has a length of 25-40 mm and a linear density of 1.5-3 dtex; the auxiliary deodorizing fiber has a length of 25-40 mm and a linear density of 1.5-3 dtex; and the Sibaji 4080 low melting point fiber has a length of 25-35 mm and a linear density of 2-4 dtex.

[0008] Preferably, the composite deodorizing agent undergoes a dispersion pretreatment, which involves first using a dispersant and then ultrasonic dispersion.

[0009] Preferably, the preparation method of the auxiliary deodorizing fiber includes the following steps: a1. Dispersion pretreatment of composite deodorizing agent: Take the composite deodorizing agent, add dispersant and water, stir and disperse at 60-80℃ and 800-1200r / min for 30-60min, then ultrasonically disperse at 200-300W and 20-40kHz for 15-30min, then vacuum dry to constant weight, pulverize to obtain pretreated deodorizing agent; a2. Modification of the polymer matrix: The polymer matrix is ​​dried, then a compatibilizer is added and the mixture is co-extruded, and then granulated to obtain modified polymer particles. a3. Blend the pretreated deodorizing agent with modified polymer particles and spin them; a4. Post-stretching and shaping treatment.

[0010] Preferably, the mass ratio of the composite deodorizing agent, dispersant and water is 100:(5-10):(30-50).

[0011] Preferably, the mass ratio of the pretreatment deodorizing agent to the modified polymer particles is (5-15):(85-95).

[0012] Preferably, the dispersant is a composition of polyethylene glycol 4000 and sodium dodecylbenzenesulfonate in a mass ratio of 2:1.

[0013] Preferably, the water is deionized water.

[0014] Preferably, the polymer matrix is ​​polyester chips (PET) or polyamide chips (PA6).

[0015] Preferably, in step a1, the temperature of the vacuum drying is 80-100℃.

[0016] Preferably, in step a1, the material is further sieved through a 200-300 mesh sieve after crushing.

[0017] Preferably, in step a2, the drying process is performed at 120-140℃ and a vacuum of -0.08 to -0.09 MPa for 4-6 hours.

[0018] Preferably, in step a2, when the polymer matrix is ​​polyester chips, the temperature of the co-extrusion is 230-260°C; when the polymer matrix is ​​polyamide chips, the temperature of the co-extrusion is 220-240°C.

[0019] Preferably, in step a2, the rotation speed of the co-extrusion is 150-200 r / min.

[0020] Preferably, the mass of the compatibilizer is 0.5%-1.5% of the mass of the polymer matrix.

[0021] Preferably, the compatibilizer is maleic anhydride-grafted polyethylene wax.

[0022] Preferably, in step a3, the parameters of the blend spinning are: melt temperature of 240-270℃ (PET matrix) or 230-250℃ (PA6 matrix), spinneret orifice diameter of 0.2-0.4mm, spinning speed of 800-1200m / min, cooling air temperature of 20-30℃, and cooling air velocity of 0.5-1.0m / s.

[0023] Preferably, in step a4, the parameters of the stretching and shaping treatment are: stretching temperature of 80-120℃ (PET matrix) or 60-100℃ (PA6 matrix), stretching ratio of 2.5-4.0 times, stretching speed of 50-100m / min; shaping temperature of 120-150℃, shaping time of 10-20min, and shaping tension of 5-10cN / dtex.

[0024] Preferably, the pretreatment of jute fiber also includes physical impurity removal to remove easily detachable impurities such as dust, broken leaves, and residual fruit shells from the surface of the jute fiber, thereby reducing reagent consumption for subsequent chemical treatment.

[0025] Preferably, the physical dust removal includes opening and combing and airflow dust removal.

[0026] The opening and carding process involves placing raw jute fibers into an opening machine and opening them for 20-30 minutes at a speed of 600-800 r / min and a roller spacing of 5-8 mm. This mechanical force disperses the fiber bundles, allowing impurities to initially separate from the fibers. Subsequently, the fibers are carded using a carding machine with a carding cloth density of 250-300 needles / inch and a roller speed of 15-20 m / min to further remove fine impurities embedded in the fiber bundles.

[0027] The airflow dust removal process involves feeding the opened and combed fibers into an airflow dust collector, controlling the wind speed at 8-12 m / s and the wind pressure at 0.03-0.05 MPa, and using high-speed airflow to remove light impurities such as dust suspended on the fiber surface, with a processing time of 10-15 minutes.

[0028] Preferably, the chemical degumming is performed by immersing jute fibers in a treatment solution at a bath ratio of 1:(10-15) and then boiling them; the treatment solution includes a sodium hydroxide solution with a mass concentration of 5%~8%, a sodium tripolyphosphate solution with a mass concentration of 1%~2%, and a penetrant with a mass concentration of 0.5%~1.0%.

[0029] Preferably, the scouring process is carried out at 95-100℃ (normal pressure) for 60-90 minutes, with stirring every 15 minutes during the scouring process to ensure that the fiber is in full contact with the treatment liquid.

[0030] Preferably, the process after boiling and scouring further includes washing and drying / setting steps. The washing includes water washing and acid washing. The water washing involves washing the boiled jute fibers 3-4 times with deionized water at 40-50℃ until the pH of the washing solution drops to 7-8. The acid washing involves immersing the washed jute fibers in a 0.5%-1.0% (v / v) dilute sulfuric acid solution at a bath ratio of 1:(8-10) at room temperature for 15-20 minutes to neutralize any residual alkaline substances on the fiber surface and prevent reagent failure during subsequent processing. After immersion, the fibers are washed with room temperature deionized water until the pH stabilizes at 6.5-7.0.

[0031] Preferably, the drying and shaping is carried out at a temperature of 60-70℃ and a wind speed of 1-2 m / s, controlling the moisture content of the jute fiber after drying to be 8%-10%. The moisture content is detected by weighing, i.e.: Moisture content = mass after drying / mass of wet fiber × 100%.

[0032] The softening modification treatment is as follows: using a composite softener with a concentration of 3% to 5%, soaking the degummed jute fibers in a bath ratio of 1:(8-10), rolling, and drying.

[0033] Preferably, the soaking treatment is to soak at room temperature for 30-40 minutes, and to stir once every 10 minutes during the soaking treatment.

[0034] Preferably, the rolling liquid has a rolling rate of 70%-80%, wherein the rolling rate = post-rolled fiber mass - dry fiber mass / dry fiber mass × 100%.

[0035] Preferably, the drying process employs low-temperature baking, specifically: baking for 25-35 minutes at a temperature of 50-60℃ and a hot air velocity of 0.8-1.2m / s, so that the softener solidifies into a film on the fiber surface, and the fiber moisture content is controlled at 7%-9% after baking.

[0036] Preferably, the composite softener is composed of the following components in weight percentage: 3%-5% fatty acid polyoxyethylene ester, 1%-2% glycerol and the balance being solvent.

[0037] Furthermore, the core layer of the 4080 low-melting-point fiber has a melting point of 250°C, and the sheath layer has a melting point of 80-100°C. After the sheath layer of the 4080 low-melting-point fiber melts, it can form adhesive points between the fibers, thereby improving the strength and dimensional stability of the cotton felt.

[0038] Secondly, the present invention also provides a method for preparing the above-mentioned needle-punched cotton felt containing plant functional fibers, which includes the following steps: S1. Raw material preparation: Prepare the following raw materials by weight percentage: 30%-50% jute fiber, 15%-30% polyester staple fiber, 5%-15% auxiliary deodorizing fiber, and 10%-20% 4080 low melting point fiber; pre-treat the jute fiber. S2. Opening and mixing: The pretreated jute fiber is opened and mixed evenly with polyester staple fiber, auxiliary deodorizing fiber and 4080 low melting point fiber. S3. Carding into a web: The mixed fibers are carded to form a web with a basis weight of 200-500 g / m². 2 Fiber web; S4. Needle punching reinforcement: The fiber web is needle punched to a depth of 2-10 mm and a frequency of 500-1500 times / min to obtain a cotton felt blank. S5. Heat setting: The cotton felt blank is treated at 90-110℃ for 20-40 minutes to melt and bond the outer layer of the 4080 low melting point fiber to obtain the needle-punched cotton felt containing plant functional fibers.

[0039] Preferably, in step S1, the opening parameters are: rotation speed 1200-1800 r / min, time 5-10 minutes; the mixing parameters are: rotation speed 800-1200 r / min, mixing time 12-25 minutes.

[0040] Preferably, step S2 is carried out in a cotton blending machine equipped with a negative pressure suction device. The air pressure of the negative pressure suction device is controlled at -0.02MPa to -0.03MPa to simultaneously remove fine impurities and short fibers (length <10mm) that fall off during the opening process, ensuring the cleanliness of the fibers after opening.

[0041] Preferably, in step S3, a carding machine with a cylinder speed of 300-400 r / min and a doffer speed of 150-250 r / min is used.

[0042] Preferably, in step S4, the number of acupuncture points per unit area is 100-300 times / cm. 2 .

[0043] Preferably, in step S4, the acupuncture involves multiple needle insertions, with each needle insertion consisting of 100-300 insertions per unit area per cm. 2 .

[0044] Through the above design, the present invention has the following effects: This invention introduces specially formulated deodorizing fibers with additives and optimizes their dispersion and binding force within the fiber system. This allows cotton felt to maintain excellent mechanical strength while achieving highly efficient deodorization and removal of ammonia, hydrogen sulfide, and formaldehyde, with a significantly improved deodorization performance retention rate. A pretreatment process combining specific composite alkali degumming and composite softener modification of jute fibers effectively reduces their coarseness and enhances their flexibility and cohesion, solving the technical challenges of jute fiber blending and improving the hand feel of the final product. The introduction of 4080 low-melting-point fibers utilizes their sheath melting to form additional bonding points, creating a "double reinforcement" mechanism with needle-punching entanglement. This significantly improves the dimensional stability and mechanical strength of the cotton felt, while reducing needle-punching density requirements, minimizing fiber damage, and increasing production efficiency. Furthermore, the raw materials utilize a large amount of renewable jute fiber, resulting in no harmful pollutants generated during the preparation process. The composite deodorizing additives and pretreatment process improve the utilization rate and functional durability of the additives. The overall process is green, environmentally friendly, economical, and efficient, suitable for large-scale industrial production. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the overall process for preparing needle-punched cotton felt containing plant functional fibers, as provided in Embodiment 1 of the present invention. Detailed Implementation

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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.

[0048] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0049] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0050] Example 1 A needle-punched cotton felt containing plant functional fibers comprises the following raw materials by weight percentage: 40% jute fiber, 25% polyester staple fiber, 10% auxiliary deodorizing fiber, and 25% 4080 low melting point fiber.

[0051] like Figure 1 As shown, the preparation method of the needle-punched cotton felt containing plant functional fibers is as follows: S1. Raw material preparation: Prepare the following raw materials by weight percentage: 40% jute fiber, 25% polyester staple fiber, 10% auxiliary deodorizing fiber, and 25% 4080 low melting point fiber; a. Preparation of auxiliary deodorizing fibers (PET-based): a1. Dispersion pretreatment of composite deodorizing agent: Take 10 kg of composite deodorizing agent (nano zinc oxide: chitosan derivative: zeolite powder = 4:3:2), add 0.8 kg of dispersant (polyethylene glycol 4000: sodium dodecylbenzenesulfonate = 2:1) and 40 kg of deionized water, stir and disperse at 70℃ and 1000 r / min for 45 min, then ultrasonically disperse at 250 W and 30 kHz for 20 min, the resulting dispersion is vacuum dried at 90℃ to constant weight, pulverized and passed through a 250 mesh sieve to obtain the pretreated deodorizing agent; a2. Modification of the polymer matrix: PET chips were dried at 130℃ and vacuum degree -0.085MPa for 5h. 90kg of dried PET chips were taken and 0.9kg of maleic anhydride-grafted polyethylene wax (compatibilizer) was added. The mixture was melt-blended and extruded in a twin-screw extruder at 250℃ and granulated to obtain modified PET granules.

[0052] a3. Blending and spinning the pretreated deodorizing agent with modified polymer particles: Mix 10 kg of pretreated deodorizing agent with 90 kg of modified PET particles evenly, and then melt spin (melt temperature 260℃, spinneret orifice diameter 0.3 mm, spinneret speed 1000 m / min, cooling air temperature 25℃) to obtain nascent fibers.

[0053] a4. Post-stretching and setting treatment: The nascent fiber is stretched 3.0 times at 100℃ and then heat-set at 135℃ for 15 minutes (setting tension 8cN / dtex) to obtain PET-based auxiliary deodorizing fiber with a length of 38mm and a linear density of 2.5dtex.

[0054] b. Pretreatment of jute fiber b1. Physical impurity removal: The jute fibers are opened by an opening machine (700r / min) for 25 minutes, then combed by a carding machine, and finally treated by an airflow dust collector (wind speed 10m / s) for 12 minutes.

[0055] b2. Chemical degumming: Prepare a composite alkaline solution (containing 6wt% NaOH, 1.5wt% sodium tripolyphosphate, 0.8wt% JFC penetrant, and water as solvent). Immerse the cleaned jute fibers in the composite alkaline solution at a bath ratio of 1:12 and scour at 98℃ for 75 minutes, stirring every 15 minutes. After scouring, wash with 45℃ warm water until the pH reaches 7.5, then neutralize by soaking in 0.8wt% dilute sulfuric acid solution at room temperature for 18 minutes, and finally wash with deionized water until the pH reaches 6.8.

[0056] b3. Drying and shaping: The neutralized fibers are placed in a hot air drying oven and dried at a temperature of 65℃ and a wind speed of 1.5m / s, with the moisture content of the fibers controlled at 9% after drying.

[0057] b4. Softening Modification: Prepare a composite softener solution (containing 4 wt% fatty acid polyoxyethylene ester, 1.5 wt% glycerol, and the balance being deionized water). Immerse the degummed jute fibers in the composite softener solution at a bath ratio of 1:9 at room temperature for 35 minutes, stirring every 15 minutes. After removal, roll the fibers using a rolling mill to control the liquid-to-fiber ratio to approximately 75%. Then, place the fibers in a 55℃ hot air oven at a wind speed of 1.0 m / s for 30 minutes to reduce the fiber moisture content to 8%, obtaining pretreated jute fibers with a length of 40 mm and a linear density of 3 dtex.

[0058] c. Other raw materials: Polyester staple fiber: length 38mm, linear density 2.0dtex.

[0059] 4080 low melting point fiber: 90℃ for the outer layer, 250℃ for the core layer, 32mm in length, and 3.0dtex in linear density.

[0060] S2. Opening and Mixing: After opening the pretreated jute fiber with polyester staple fiber, PET auxiliary deodorizing fiber and 4080 low melting point fiber at 1600 r / min for 8 minutes, put them into a cotton blending machine equipped with a negative pressure suction device (air pressure -0.025MPa) and mix at 1000 r / min for 18 minutes.

[0061] S3. Carding and Web Formation: Feed the mixed fibers into the carding machine, set the cylinder speed to 350 r / min and the doffer speed to 200 r / min, and the carding form a web density of 350 g / m². 2 A uniform fiber web.

[0062] S4. Needle reinforcement: A single-needle plate needle punching machine is used, with 30# triangular needles selected and a needle plate density of 220 needles / cm². 2 The needle insertion depth is set to 6mm, the needle insertion frequency to 1000 times / min, and the conveying speed to 10m / min (200 needle insertions / cm² per unit area). 2 The fiber web is needle-punched to reinforce it, resulting in a cotton felt blank.

[0063] S5. Heat setting: The cotton felt blank is placed in a heat setting machine and treated at 100°C for 30 minutes to melt and bond the 4080 low-melting-point fiber sheath. After naturally cooling to room temperature, it is cut and curled as needed to obtain the needle-punched cotton felt containing plant functional fibers.

[0064] Example 2 A needle-punched cotton felt containing plant functional fibers comprises the following raw materials by weight percentage: 50% jute fiber, 15% polyester staple fiber, 15% auxiliary deodorizing fiber, and 20% 4080 low melting point fiber.

[0065] The preparation method of the above-mentioned needle-punched cotton felt containing plant functional fibers is as follows: S1. Raw material preparation: Prepare raw materials according to the above mass percentages.

[0066] a. Preparation of auxiliary deodorizing fiber (PA6-based): a1. Dispersion pretreatment of composite deodorizing agent: Take 10 kg of composite deodorizing agent (nano zinc oxide: chitosan derivative: zeolite powder = 3:4:1), add 0.6 kg of dispersant (polyethylene glycol 4000: sodium dodecylbenzenesulfonate = 2:1) and 35 kg of deionized water, stir and disperse at 65℃ and 900 r / min for 50 min, then ultrasonically disperse at 220 W and 25 kHz for 25 min, the resulting dispersion is vacuum dried at 85℃ to constant weight, pulverized and passed through a 200 mesh sieve to obtain the pretreated deodorizing agent.

[0067] a2. Modification of the polymer matrix: PA6 chips were dried at 125℃ and vacuum degree -0.08MPa for 4.5h. 92kg of dried PA6 chips were taken and 0.736kg of maleic anhydride-grafted polyethylene wax (compatibilizer) was added. The mixture was melt-blended and extruded in a twin-screw extruder at 230℃ and granulated to obtain modified PA6 granules.

[0068] a3. Blending spinning: 8 kg of pretreated deodorizing agent and 92 kg of modified PA6 granules are mixed evenly and then melt-spun (melting temperature 240℃, spinneret orifice diameter 0.25 mm, spinning speed 900 m / min, cooling air temperature 22℃) to obtain nascent fibers.

[0069] a4. Post-treatment: The nascent fibers are stretched 3.5 times at 85℃ and then heat-set at 125℃ for 18 minutes (setting tension 6cN / dtex) to obtain PA6-based auxiliary deodorizing fibers with a length of 25mm and a linear density of 3dtex.

[0070] b. Pretreatment of jute fiber b1. Physical impurity removal: The jute fibers are opened by an opening machine (700r / min) for 25 minutes, then combed by a carding machine, and finally treated by an airflow dust collector (wind speed 10m / s) for 12 minutes.

[0071] b2. Chemical degumming: Prepare a compound alkaline solution (containing 8wt% NaOH, 2.0wt% sodium tripolyphosphate, 1.0wt% penetrant JFC, and water as solvent). Immerse the cleaned jute fibers in the compound alkaline solution at a bath ratio of 1:15 and scour at 100℃ for 60 minutes, stirring every 15 minutes. After scouring, wash with 45℃ warm water until the pH reaches 7.5, then neutralize by soaking in 0.8wt% dilute sulfuric acid solution at room temperature for 18 minutes, and finally wash with deionized water until the pH reaches 6.8.

[0072] b3. Drying and shaping: Place the neutralized fibers into a hot air drying oven and dry them at a temperature of 60℃ and a wind speed of 2m / s, controlling the moisture content of the fibers after drying to 8%.

[0073] b4. Softening Modification: Prepare a composite softener solution (same as in Example 1). Immerse the degummed jute fibers in the composite softener solution at a bath ratio of 1:10 at room temperature for 40 minutes, stirring every 15 minutes. After removal, roll the fibers using a rolling mill to control the liquid-to-fiber ratio to approximately 75%. Then, place the fibers in a 55°C hot air oven at a wind speed of 1.0 m / s for 30 minutes to reduce the fiber moisture content to 8%, obtaining pretreated jute fibers with a length of 30 mm and a linear density of 5 dtex.

[0074] c. Other raw materials: Polyester staple fiber: 25mm in length, 3dtex in linear density.

[0075] 4080 low melting point fiber: sheath melting point 80℃, core melting point 250℃, length 25mm, linear density 4.0dtex.

[0076] S2. Opening and Mixing: After opening the pretreated jute fiber with polyester staple fiber, auxiliary deodorizing fiber and 4080 low melting point fiber at 1200 r / min for 10 minutes, put them into a cotton blending machine equipped with a negative pressure suction device (air pressure -0.02MPa) and mix at 1200 r / min for 12 minutes.

[0077] S3. Carding into a web: The mixed fibers are fed into a carding machine and carded to form a web with an areal density of 300 g / m². 2 A uniform fiber web.

[0078] S4. Needle Punching Reinforcement: A single-needle plate needle punching machine is used. To reduce damage to jute fibers, 32# diamond-shaped needles are selected, with a needle plate density of 200 needles / cm². 2 The needle-punching depth is set to 7mm, the needle-punching frequency to 700 times / min, and the conveying speed to 8m / min. The fiber web is needle-punched and reinforced to obtain a cotton felt blank.

[0079] S5. Heat setting: The cotton felt blank is placed in a heat setting machine and treated at 95°C for 35 minutes. After naturally cooling to room temperature, it is cut and curled to obtain the needle-punched cotton felt.

[0080] Example 3 A needle-punched cotton felt containing plant functional fibers comprises the following raw materials by weight percentage: 30% jute fiber, 30% polyester staple fiber, 5% auxiliary deodorizing fiber, 20% 4080 low melting point fiber, and 15% ordinary polyester staple fiber.

[0081] The preparation method of the above-mentioned needle-punched cotton felt containing plant functional fibers is as follows: S1. Raw material preparation: Prepare raw materials according to the above mass percentages.

[0082] a. Preparation of auxiliary deodorizing fibers (PET-based): a1. Dispersion pretreatment of composite deodorizing agent: Take 10 kg of composite deodorizing agent (nano zinc oxide: chitosan derivative: zeolite powder = 5:2:3), add 1.0 kg of dispersant and 50 kg of deionized water, stir and disperse at 80℃ and 1200 r / min for 30 min, then ultrasonically disperse at 300 W and 40 kHz for 15 min, the resulting dispersion is vacuum dried at 100℃ to constant weight, pulverized and passed through a 300 mesh sieve to obtain the pretreated deodorizing agent.

[0083] a2. Modification of the polymer matrix: PET chips were dried at 140℃ and vacuum degree -0.09MPa for 4 hours. 95kg of dried PET chips were taken and 1.425kg of maleic anhydride-grafted polyethylene wax (compatibilizer) was added. The mixture was melt-blended and extruded in a twin-screw extruder at 255℃ and granulated to obtain modified PET granules.

[0084] a3. Blending spinning: 5 kg of pre-treated deodorizing agent is mixed evenly with 95 kg of modified PET granules, and nascent fibers are obtained by melt spinning (melt temperature 270℃, spinneret orifice diameter 0.35 mm, spinneret speed 1200 m / min, cooling air temperature 30℃).

[0085] a4. Post-treatment: 2.5 times stretch at 120℃, and then heat set at 150℃ for 10 min (setting tension 10cN / dtex) to obtain PET-based auxiliary deodorizing fiber with a length of 40mm and a linear density of 1.5dtex.

[0086] b. Pretreatment of jute fiber b1. Physical impurity removal: The jute fibers are opened by an opening machine (700r / min) for 25min, then combed by a carding machine, and finally treated by an airflow dust collector (wind speed 10m / s) for 12min.

[0087] b2. Chemical degumming: Prepare a compound alkaline solution (containing 5wt% NaOH, 1.0wt% sodium tripolyphosphate, 0.5wt% JFC penetrant, and water as solvent). Immerse the cleaned jute fibers in the compound alkaline solution at a bath ratio of 1:10 and scour at 95℃ for 90 minutes, stirring every 15 minutes. After scouring, wash with 45℃ warm water until the pH reaches 7.5, then neutralize by soaking in 0.8wt% dilute sulfuric acid solution at room temperature for 18 minutes, and finally wash with deionized water until the pH reaches 6.8.

[0088] b3. Drying and shaping: Place the neutralized fibers into a hot air drying oven and dry them at a temperature of 70℃ and a wind speed of 1m / s, controlling the moisture content of the fibers after drying to 10%.

[0089] b4. Softening Modification: Prepare a composite softener solution (containing 3 wt% fatty acid polyoxyethylene ester, 1.0 wt% glycerol, and the balance being deionized water). Immerse the degummed jute fibers in the composite softener solution at a bath ratio of 1:8 at room temperature for 30 minutes, stirring every 15 minutes. After removal, roll the fibers using a rolling mill to control the liquid-to-fiber ratio to approximately 75%. Then, place the fibers in a 55℃ hot air oven at a wind speed of 1.0 m / s for 30 minutes to reduce the fiber moisture content to 8%, obtaining pretreated jute fibers with a length of 50 mm and a linear density of 2 dtex.

[0090] c. Other raw materials: Polyester staple fiber: 40mm in length, 1.5dtex in linear density.

[0091] 4080 low melting point fiber: sheath melting point 100℃, core melting point 250℃, length 35mm, linear density 2.0dtex.

[0092] S2. Opening and Mixing: After opening the pretreated jute fiber with polyester staple fiber, auxiliary deodorizing fiber and 4080 low melting point fiber at 1800 r / min for 5 minutes, put them into a cotton blending machine equipped with a negative pressure suction device (air pressure -0.03MPa) and mix at 800 r / min for 25 minutes.

[0093] S3. Carding and Web Formation: The mixed fibers are fed into a carding machine and carded to form a web with an areal density of 450 g / m². 2 A uniform fiber web.

[0094] S4. Needle reinforcement: A single-needle plate needle punching machine is used, with 28# triangular needles selected and a needle plate density of 250 needles / cm². 2 The needle-punching depth is set to 4mm, the needle-punching frequency to 1200 times / min, and the conveying speed to 15m / min. The fiber web is then needle-punched and reinforced to obtain a cotton felt blank.

[0095] S5. Heat setting: The cotton felt blank is placed in a heat setting machine and treated at 110°C for 20 minutes. After naturally cooling to room temperature, it is cut and curled to obtain the needle-punched cotton felt.

[0096] Comparative Example 1 The only difference between this comparative example and Example 1 is that the composite deodorizing agent was not pretreated for dispersion.

[0097] Comparative Example 2 The only difference between this comparative example and Example 1 is the type of deodorizing fiber used in the auxiliary agent. Specifically, ordinary polyester staple fiber (specifications: length 38 mm, linear density 2.0 dtex) identical to that in Example 1 was taken and immersed in a finishing solution containing a composite deodorizing agent. The finishing solution was prepared as follows: 10 kg of the same composite deodorizing agent as in Example 1 was added to 40 kg of deionized water to form a suspension, and then 0.8 kg of the same dispersant as in Example 1 was added. The solution was stirred and dispersed at 70°C and 1000 r / min for 45 min to obtain the finishing solution.

[0098] Polyester staple fibers were immersed in the above finishing solution at a liquor ratio of 1:12 for 30 minutes at room temperature to ensure full wetting. The fibers were then removed and rolled using a rolling mill, controlling the liquid extraction rate to approximately 75%. The fibers were then placed in an oven and baked at 140°C for 4 minutes to allow the deodorizing agent to adhere to the fiber surface. This yielded a post-finished deodorizing fiber with a deodorizing agent loading comparable to that of the auxiliary agent-type deodorizing fiber in Example 1.

[0099] Comparative Example 3 The only difference between this comparative example and Example 1 is that the composite deodorizing agent does not contain nano zinc oxide.

[0100] Comparative Example 4 The only difference between this comparative example and Example 1 is that the composite deodorizing agent does not contain chitosan derivatives.

[0101] Comparative Example 5 The only difference between this comparative example and Example 1 is that the composite deodorizing agent does not contain zeolite powder.

[0102] Comparative Example 6 The only difference between this comparative example and Example 1 is that the mass ratio of nano zinc oxide, chitosan derivative, and zeolite powder is 9:2:4.

[0103] Comparative Example 7 The only difference between this comparative example and Example 1 is that the mass ratio of nano zinc oxide, chitosan derivative, and zeolite powder is 2:5:3.

[0104] Comparative Example 8 The only difference between this comparative example and Example 1 is that a conventional polymer matrix (PET) is used instead of the modified polymer matrix, i.e., no compatibilizer is added in step a2.

[0105] Comparative Example 9 The only difference between this comparative example and Example 1 is that the jute fibers were not chemically degummed.

[0106] Comparative Example 10 The only difference between this comparative example and Example 1 is that the jute fibers were not subjected to softening modification treatment.

[0107] Comparative Example 11 The only difference between this comparative example and Example 1 is that it does not include auxiliary deodorizing fibers.

[0108] Comparative Example 12 The only difference between this comparative example and Example 1 is that it does not include 4080 low melting point fiber.

[0109] Comparative Example 13 The only difference between this comparative example and Example 1 is the percentage of raw materials: 60% jute fiber, 10% polyester staple fiber, 5% auxiliary deodorizing fiber, and 25% 4080 low melting point fiber. Everything else is the same as in Example 1.

[0110] The deodorizing fibers of Examples 1-3 and Comparative Examples 1-8 were subjected to performance tests, including their deodorizing ability, deodorizing durability, and mechanical properties. The test methods are as follows: Odor removal performance test: Referring to GB / T 35126-2017 "Determination of odor removal performance of textiles", the closed chamber method was used to test the removal rate of ammonia (initial concentration 100ppm), hydrogen sulfide (initial concentration 50ppm) and formaldehyde (initial concentration 20ppm) by the fiber, and the test time was 2h and 24h respectively; at the same time, the wash durability test was carried out. After the fiber was washed 50 times according to standard (GB / T8629-2017), the odor removal performance was tested again.

[0111] Mechanical property testing: Referring to GB / T 14344-2017 "Test Method for Tensile Properties of Chemical Fibers (Short Fibers)," the breaking strength (cN / dtex) and breaking elongation (%) of the fiber were tested. The test results are shown in Table 1 below: Table 1. Test results of deodorizing fiber performance in Examples 1-3 and Comparative Examples 1-8 As shown in Table 1, the deodorizing fiber prepared by the technical solution of the present invention has good deodorizing performance, high deodorizing durability, and can maintain good mechanical properties.

[0112] To further verify the technical effects of the present invention, the needle-punched cotton felts prepared in Examples 1-3 and Comparative Examples 9-13 were tested for breaking strength, elongation at break, and hand feel. The test methods are as follows: The test method is in accordance with GB / T 24218.3-2010 Textiles - Test Methods for Nonwoven Fabrics - Part 3: Determination of Tensile Strength.

[0113] Hand feel evaluation: The subjective evaluation was conducted in accordance with Appendix A of FZ / T01166-2022 "Methods for Testing and Evaluating the Hand Feel of Fabrics".

[0114] The test methods are shown in Table 2 below: Table 2. Test results of deodorizing fiber performance in Examples 1-3 and Comparative Examples 9-13 In summary, the needle-punched cotton felt containing plant functional fibers and its preparation method provided by the present invention, through a specific raw material combination system, jute fiber pretreatment process, and auxiliary deodorizing fiber, successfully solves a series of problems existing in the prior art, such as insufficient strength, rough hand feel, lack of deodorizing function, or poor durability.

[0115] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A needle punched batt containing plant functional fibers, characterized in that, Raw materials including the following mass percentages: jute fiber 30%-50%, polyester staple fiber 15%-30%, auxiliary deodorizing fiber 5%-15%, 4080 low-melting-point fiber 10%-20%; The jute fiber is pretreated, and the pretreatment includes chemical degumming and softening modification treatment; The auxiliary deodorizing fiber is a fiber prepared by blending and spinning a composite deodorizing auxiliary and a modified polymer matrix; the composite deodorizing auxiliary includes nano zinc oxide, chitosan derivative and zeolite powder; and the modified polymer matrix is a polymer matrix modified by a compatibilizer.

2. The needle punched batt containing plant functional fibers according to claim 1, wherein, The mass ratio of the nano zinc oxide, chitosan derivative and zeolite powder is (3-5):(2-4):(1-3).

3. The needle punched batt containing plant functional fibers according to claim 1, wherein The preparation method of the auxiliary deodorizing fiber includes the following steps: a1. Dispersion pretreatment of the composite deodorizing auxiliary: take the composite deodorizing auxiliary, add a dispersant and water, stir and disperse at 60-80℃ and a rotation speed of 800-1200r / min for 30-60min, then ultrasonic disperse at a power of 200-300W and a frequency of 20-40kHz for 15-30min, and then vacuum dry to constant weight, crush to obtain pretreated deodorizing auxiliary; a2. Modification treatment of the polymer matrix: dry the polymer matrix, then add a compatibilizer, blend and extrude, and then granulate to obtain modified polymer particles; a3. Blend and spin the pretreated deodorizing auxiliary and the modified polymer particles; a4. Post-treatment after stretching and setting.

4. The needle punched batt containing plant functional fibers according to claim 3, wherein The mass ratio of the composite deodorizing auxiliary, dispersant and water is 100:(5-10):(30-50).

5. The needle punched batt containing plant functional fibers according to claim 3, wherein The mass of the compatibilizer is 0.5%-1.5% of the mass of the polymer matrix.

6. The needle punched batt containing plant functional fibers according to claim 3, wherein The mass ratio of the pretreated deodorizing auxiliary and the modified polymer particles is (5-15):(85-95).

7. The needle punched batt containing plant functional fibers according to claim 1, wherein The chemical degumming is: immerse the jute fiber in a treatment liquid at a bath ratio of 1:(10-15) and carry out scouring; the treatment liquid includes a sodium hydroxide solution with a mass concentration of 5%-8%, a sodium tripolyphosphate solution with a mass concentration of 1%-2% and a penetrant with a mass concentration of 0.5%-1.0%; The softening modification treatment is: use a composite softener with a concentration of 3%-5% to immerse the degummed jute fiber at a bath ratio of 1:(8-10), then roll and dry.

8. The needle punched batt containing plant functional fibers according to claim 7, wherein The composite softener is composed of the following components in the following mass percentages: 3%-5% of fatty acid polyoxyethylene ester, 1%-2% of glycerol and the rest of solvent.

9. The needle punched batt containing plant functional fibers according to claim 1, wherein, The core layer of the 4080 low-melting-point fiber has a melting point of 250℃, and the skin layer has a melting point of 80-100℃.

10. A method of producing the needle punched batt containing plant functional fibers according to any one of claims 1 to 9, characterized by, The method includes the following steps: S1. Raw material preparation: prepare the following raw materials in mass percentages: jute fiber 30%-50%, polyester staple fiber 15%-30%, auxiliary deodorizing fiber 5%-15%, 4080 low-melting-point fiber 10%-20%; pretreat the jute fiber; S2. Opening and mixing: uniformly mix the pretreated jute fiber, polyester staple fiber, auxiliary deodorizing fiber and 4080 low-melting-point fiber after opening; S3, carding: the mixed fibers are carded to form a fiber web having a basis weight of 200-500 g / m 2 ; S4, needle punching reinforcement: the fiber web is subjected to needle punching, the needle punching depth is 2-10 mm, the needle punching frequency is 500-1500 times / min, and a cotton felt blank is obtained; S5, heat setting: the cotton felt blank is treated at 90-110 DEG C for 20-40 minutes, the skin layer of 4080 low-melting-point fibers is fused and bonded, and the needle-punched cotton felt containing plant functional fibers is prepared.

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