Anti-fibrillation finishing method and device for lyocell yarns

Abstract

The invention discloses an anti-fibrillation finishing method for lyocell yarns, which comprises the following steps: (1) preparing a finishing liquid; (2) continuously dipping: continuously dipping a single yarn into the finishing liquid to enable the yarn to uniformly absorb the finishing liquid; (3) controlling the liquid carrying rate: treating the yarns uniformly dipped in the finishing liquid through a flexible water absorption part under the condition of tension; (4) contact type drying: winding the yarn on the surface of a rotating drying heating part, and continuously and uniformly drying the yarn while outputting the yarn; (5) performing contact type baking: winding a single yarn on the surface of a rotating baking heating part, and performing continuous and uniform baking crosslinking treatment on the yarn while outputting the yarn; and (6) rolling, wherein the anti-fibrillation lyocell yarn is obtained. The fibrillation tendency in the yarn production and use process is effectively reduced, the cross-linking agent material is efficiently and fully utilized, and the effects of ultralow preparation cost and high fiber cross-linking quality are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of functional finishing of textiles, and in particular to an anti-fibrillation finishing method and device for lyocell yarns. Background Art

[0002] Lyocell is a regenerated cellulose spun from NMNO solution by dry-jet wet spinning. The fiber production process is environmentally friendly and pollution-free, and the solvent NMMO can be recycled with a recovery rate of up to 99.5%. In addition to its green performance, lyocell fiber also has excellent properties such as good water absorption, high strength, silky luster and soft feel. Based on these properties, it can be widely used in various process products such as clothing, sewing thread, filter materials, coated fabrics, non-woven fabrics, etc., which brings a comfortable and soft feeling to users. Because lyocell fiber has a wide range of sources and can be naturally regenerated, and its processing technology is clean and pollution-free, and it can be degraded after use. Environmental friendliness and other green properties, therefore, lyocell fiber is called the most representative new green fiber in the 21st century.

[0003] However, lyocell also has a serious disadvantage, namely the fibrillation phenomenon. The fibrillation phenomenon refers to the appearance of fine fibrils on the surface of lyocell fibers under wet conditions and the action of external forces. The fibrils are entangled and knotted with each other. When the external force is severe, pilling will occur on the surface of the fabric. This phenomenon is called the fibrillation phenomenon of lyocell fibers. On the one hand, the fibrillation of lyocell fibers can be used to achieve specific finishing effects, such as peach skin finishing effects, silk touch and soft denim. However, it has more adverse effects on fabrics, such as making dyed fabrics old, frost and white spots on fabrics, and affecting the service life.

[0004] At present, reducing the fibrillation tendency of Lyocell fibers is mainly achieved through anti-fibrillation cross-linking agents. Lyocell hanks are usually processed by traditional impregnation, which makes it difficult for the yarn to obtain uniform anti-fibrillation properties, especially in the baking stage, it is difficult for the yarn to reach the baking temperature uniformly to achieve cross-linking; and the hanks are impregnated with a large bath ratio, resulting in high energy costs and water consumption, low chemical utilization, and low production efficiency. The processing of Lyocell bobbin yarn involves winding the yarn on perforated tubes and then placing these tubes in an aqueous solution containing chemicals. During the treatment process, the chemicals in the solution interact with the textile fibers, causing the chemical molecules to react with the fiber macromolecules to achieve the desired performance.

[0005] The main solution to the problem of lyocell fiber fibrillation is to cross-link the fibers, which includes the following technologies:

[0006] CN104005225A discloses a method for reducing the fibrillation tendency of lyocell cellulose fibers, the steps of which are as follows: (1) immersing lyocell fibers in a solution containing a crosslinking agent, a catalyst and a penetrant; (2) pretreating the fibers at 75-85°C for 90-150s after rolling them dry, and then baking them at 125-135°C for 90-150s to solidify and crosslink the fibers; (3) washing the baked fibers with 50°C soft water for 3-7 times, and then washing them with cold soft water for 1-3 times; (4) finally drying the fibers at 80°C to obtain lyocell cellulose fibers that are resistant to fibrillation. The crosslinking agent provided by the present invention is easy to obtain, and the lyocell cellulose fibers are treated by a specific method to obtain lyocell fibers with fibrosis resistance.

[0007] CN 111893749A provides a method for treating lyocell fibers to resist fibrillation. The lyocell fibers are immersed in a crosslinking liquid and treated by a double-immersion and double-rolling process to obtain the lyocell fibers after the fibrillation resistance treatment. The crosslinking liquid comprises a crosslinking agent active substance and a latent acid catalyst. The crosslinking agent active substance is a mixture of two or more C2-C6 dialdehyde compounds. The crosslinking agent used in the treatment method has a simple synthesis process, is cheap, has low requirements on the equipment used, and has a high crosslinking effect.

[0008] CN 117090052A discloses a method for preparing an anti-fibrillation lyocell fiber, comprising the following steps: S1) adding fibers at room temperature with a bath ratio of 1:4-10, preparing a crosslinking agent aqueous solution according to 2-5 g / L of an anti-fibrillation composition and 30-50 g / L of sodium sulfate; S2) heating the fiber to 60-80°C and keeping the temperature for 20 min, adding 15-30 g / L of soda ash, adjusting the pH value to 11-12 with a 30% caustic soda solution after running the fiber for 10 min, and continuing running the fiber for 30 min; S3) removing the fiber from the cylinder, washing the fiber with water, neutralizing the fiber, washing the fiber with water, and drying the fiber; the anti-fibrillation composition comprises a crosslinking agent, a dispersant, and a buffer, and the weight parts thereof are as follows: crosslinking agent: 60-90, dispersant: 30-50, and buffer: 1-5. The solid anti-fibrillation composition is prepared by mixing the above components and spray drying the mixture. The present invention adopts a mixture of multi-active group crosslinking agents as the main body, and its structure has good stability under neutral conditions. One active group is hydrolyzed, and the other active group still reacts with the fiber, with high reactivity. The two active groups with different acid and alkali resistances make the fiber-crosslinking agent bond stable after crosslinking.

[0009] It can be seen from the above patented technology that the basic process ideas of "padding-drying-baking" or "impregnation + steaming" are currently used to solve the problem of fibrillation of lyocell fabrics. Although the basic anti-fibrillation purpose is achieved, there are still some problems. The above treatment process obviously has similar shortcomings as the skein processing process, that is, the treatment is uneven, and the temperature difference between the inside and outside of the cheese yarn is large during drying and baking. Both of these yarn processing technologies make it difficult to fully apply cross-linking chemicals in lyocell yarns, so that effective cross-linking cannot be achieved between the original fibers, affecting the anti-fibrillation effect of lyocell yarns. Its anti-fibrillation effect is far from meeting the requirements of textiles, which has become a factor affecting the anti-fibrillation effect. The padding method is not suitable for mass production and finishing of yarns in factories, and the traditional impregnation method consumes a lot of water, a considerable part of the auxiliaries are wasted in the solution, the utilization rate of the cross-linking auxiliaries is low, and it is difficult to impregnate the yarn with a sufficient concentration of cross-linking auxiliaries, which is another factor affecting the anti-fibrillation effect. How to adapt to mass production in factories, shorten the process, reduce costs, effectively improve the utilization rate of auxiliaries, significantly improve the quality of cross-linking, and effectively reduce the fibrillation tendency during yarn production and use has become a difficult problem that technicians in the field of textile dyeing and finishing need to solve urgently. Summary of the invention

[0010] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method and device for anti-fibrillation finishing of lyocell yarn which is suitable for mass production in factories, has a short process flow, is low in cost, effectively improves the utilization rate of additives, and significantly improves the cross-linking quality.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for anti-fibrillation finishing of lyocell yarn, characterized in that it comprises the following steps:

[0012] (1) Prepare finishing liquid: add a certain mass fraction of resin and catalyst respectively, stir evenly, make the resin and catalyst fully dissolved in water, and set aside;

[0013] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly;

[0014] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated under tension through a flexible water-absorbing component;

[0015] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying and heating component, and the yarn is continuously and evenly dried while the yarn is output;

[0016] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking and heating component, and the yarn is continuously and uniformly baked and cross-linked while the yarn is output;

[0017] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0018] In the above-mentioned anti-fibrillation finishing method for lyocell yarn, in the step (1), the resin is any one or more of etherified modified dimethylol dihydroxyethylene urea resin, urea-formaldehyde resin, dimethylol ethylene urea (DMEU) resin, and melamine-formaldehyde resin, and the catalyst is one or more of magnesium chloride, citric acid, and sodium fluoroborate.

[0019] In the above-mentioned anti-fibrillation finishing method for lyocell yarn, in the step (1), the mass fraction of the resin is 60-100 g / L, and the mass fraction of the catalyst is 12-30 g / L.

[0020] In the above-mentioned anti-fibrillation finishing method for lyocell yarn, in the step (3), the liquid carrying rate of a single yarn is controlled to be 60%-100% by a flexible water-absorbing component.

[0021] In the above-mentioned anti-fibrillation finishing method for lyocell yarn, in the step (4), the rotation speed of the drying heating component is 200-700 m / min, the drying temperature is 80-160° C., and the drying time is 0.5-6 s.

[0022] In the above-mentioned anti-fibrillation finishing method for lyocell yarn, in the step (5), the rotation speed of the baking heating component is 200-700 m / min, the baking temperature is 160-200° C., and the baking time is 0.5-3 s.

[0023] In the above-mentioned anti-fibrillation finishing method for lyocell yarn, in step (3), the flexible water-absorbing component is a sponge, and in steps (4) and (5), the drying and heating component is a drying roller, and the baking and heating component is a baking roller, and the yarn is sequentially wound around the surfaces of the drying roller and the baking roller along the conveying direction, and rotates synchronously with the drying roller and the baking roller respectively.

[0024] A device for implementing an anti-fibrillation finishing method for lyocell yarn, comprising:

[0025] A working tank for placing finishing liquid;

[0026] A transmission roller for driving the lyocell yarn to be treated into the working tank and impregnating the lyocell yarn;

[0027] A flexible water-absorbing component for controlling the liquid carrying rate of the impregnated lyocell yarn and driving the yarn output;

[0028] A drying and heating component and a baking and heating component for contact drying and baking and cross-linking the output lyocell yarn;

[0029] A yarn tube for winding the lyocell yarn after baking and cross-linking treatment.

[0030] The drying heating component and the baking heating component are respectively a drying roller and a baking roller extending perpendicularly to the conveying direction of the Lyocell yarn. The Lyocell yarn is sequentially wound around the surfaces of the drying roller and the baking roller, forming a conveying area between the drying roller and the baking roller for moving the dried yarn toward the baking roller.

[0031] In the above device, the flexible water-absorbing component is a sponge that allows the lyocell yarn to pass through.

[0032] In the above device, the rotation speed of the drying roller is 500m / min, the rotation speed of the baking drum is 400m / min, the drying time is 1.13s, and the baking time is 0.9s.

[0033] The anti-fibrillation finishing method and device of the lyocell yarn of the present invention have the advantages that: the present invention provides a lyocell fiber cross-linking method based on room temperature impregnation and high temperature baking, the process can not only complete the uniform impregnation of the yarn in the finishing agent and the uniform drying and baking process of the impregnated yarn, so as to make up for the limitation that the existing printing and dyeing equipment can only perform overall finishing on the cheese yarn and the skein yarn, but also effectively reduce the fibrillation tendency during the production and use of the yarn, efficiently and fully utilize the cross-linking agent material, have ultra-low preparation cost, high fiber cross-linking quality effect, and short process flow, no wastewater discharge, low cost, simple and easy operation, and can be widely applied to the cross-linking preparation of various lyocell yarns. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the tidying device of the present invention;

[0035] Figure 2 This is a FE-SEM image of the surface of a single fiber in the lyocell yarn obtained in Example 3 of the present invention, magnified 3000 times;

[0036] Figure 3 The SEM comparison pictures of the fabric surfaces after washing with the untreated yarn and the yarn treated in Example 3 are magnified 300 times;

[0037] Figure 4 The SEM comparison pictures of the fabric surfaces after washing with the untreated yarn and the yarn treated in Example 4 are magnified 300 times;

[0038] Figure 5 The following is a SEM comparison picture of the fabric surface after washing, which is magnified 300 times, of the untreated yarn and the yarn treated in Example 5. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the present invention, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the attached drawings; while "inside" and "outside" refer to the outline of the device. In addition, in the description of this application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels and do not impose numerical requirements or establish an order. The term "plurality" means "two or more".

[0041] A method for anti-fibrillation finishing of lyocell yarn comprises the following steps:

[0042] (1) Prepare finishing liquid: add a certain mass fraction of resin and catalyst respectively, stir evenly, make the resin and catalyst fully dissolved in water, and set aside;

[0043] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly;

[0044] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated under tension through a flexible water-absorbing component;

[0045] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying and heating component, and the yarn is continuously and evenly dried while the yarn is output;

[0046] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking and heating component, and the yarn is continuously and uniformly baked and cross-linked while the yarn is output;

[0047] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0048] Among them, the resin used in the present invention belongs to the amide-formaldehyde crosslinking agent; it is the etherified modified dimethylol dihydroxyethylene urea resin DMDHEU. Other types of amide-formaldehyde crosslinking agents also include: urea-formaldehyde resin, dimethylol ethylene urea (DMEU) resin, melamine-formaldehyde resin (TMM, HMM); any one or more can be selected as needed. The etherification modification causes the hydroxyl groups at the 4 and 5 positions of the 2D resin to be replaced by ethoxy groups, and the transposition reaction is prevented, which correspondingly improves the hydrolysis stability of the crosslinking bond and can effectively reduce the amount of formaldehyde released. The main etherifying agents used are polyethylene glycol, glycerol, methanol, diethylene glycol, ethanol, mixed alcohols, etc. The catalyst can be a metal salt, such as magnesium chloride, an organic acid, such as citric acid, an organic acid salt, such as a mixture of one or more of sodium fluoroborate. The mass fraction of the resin is 60-100g / L, and the mass fraction of the catalyst is 12-30g / L. During the impregnation process, the bath ratio of the yarn to the treatment liquid is 1:3, the flexible water-absorbing component is a sponge, and the liquid carrying rate of a single yarn is controlled to be 60%-100% by the flexible water-absorbing component. The rotation speed of the drying heating component is 200-700m / min, the drying temperature is 80-160℃, and the drying time is 0.5-6s. The rotation speed of the baking heating component is 200-700m / min, the baking temperature is 160-200℃, and the baking time is 0.5-3s. The drying heating component is a drying roller, and the baking heating component is a baking roller. The yarn is wound around the surface of the drying roller and the baking roller in turn along the conveying direction, and rotates synchronously with the drying roller and the baking roller respectively.

[0049] like Figure 1 As shown, a device for implementing an anti-fibrillation finishing method for lyocell yarns comprises a working tank 2 for placing a finishing liquid 1, and a transmission roller 4 for driving a lyocell yarn 3 to be treated into the working tank 2 and impregnating the lyocell yarn 3. In order to ensure that the lyocell yarn 3 to be treated can fully contact with the finishing liquid 1, an impregnation roller 5 is installed in the working tank 2, and the lyocell yarn 3 to be treated bypasses the impregnation roller 5 to ensure that the treated lyocell yarn 3 is fully in contact with the finishing liquid 1 at the bottom of the impregnation roller 5.

[0050] The invention also comprises a flexible water-absorbing component for controlling the liquid carrying rate of the impregnated lyocell yarn and driving the output of the yarn, and the flexible water-absorbing component is a sponge 6 that allows the lyocell yarn to pass through. A drying heating component and a baking heating component for contact drying and baking crosslinking treatment of the output lyocell yarn are arranged at the output end of the sponge 6. Wherein, the drying heating component and the baking heating component are respectively a drying roller 7 and a baking roller 8 extending and arranged perpendicular to the conveying direction of the lyocell yarn, and the lyocell yarn is successively wound around the surfaces of the drying roller 7 and the baking roller 8, and a conveying area 9 for moving the dried yarn to the baking roller 8 direction is formed between the drying roller 7 and the baking roller 8. After baking, the lyocell yarn is led out, and a yarn tube 10 for winding the lyocell yarn after baking crosslinking treatment is provided.

[0051] In the present invention, the drying roller 7 and the baking roller 8 can be heated by conventional electric heating wires or electric heating tubes, and the driving device can be realized by using power and transmission devices such as servomotors and speed reducers, which are prior art and are not shown in the accompanying drawings. In order to realize that the lyocell yarn can rotate synchronously with the drying roller 7 and the baking roller 8 respectively during drying and baking, and improve the conveying efficiency and cross-linking efficiency, the surfaces of the drying roller 7 and the baking roller 8 can be processed by increasing the roughness without damaging the lyocell yarn, for example, the surfaces are covered with a high temperature resistant rubber coating, etc.

[0052] Too much tension can easily damage the strength of the yarn, while too little tension cannot accurately control the yarn liquid carrying rate and affects efficiency. Therefore, the optimal parameters of the present invention are that the rotation speed of the drying roller 7 is 500m / min, the rotation speed of the baking drum 8 is 400m / min, the drying time is 1.13s, and the baking time is 0.9s. Regarding the drying time and baking time, accurate control can be achieved by the roller rotation speed and the number of yarn turns around the roller. Of course, the three processes of step (3) controlling the liquid carrying rate, (4) contact drying, and (5) contact baking can be performed continuously or separately, and can be flexibly selected according to the actual production situation of the factory.

[0053] The present invention can evenly and quickly absorb, diffuse and fix the crosslinking agent on the yarn by adjusting the roller rotation speed and controlling the liquid amount of the sponge, and will not affect the surface hairiness and internal structure of the yarn; and the traditional impregnation method consumes a lot of water, and a considerable part of the auxiliary agent is wasted in the solution, while our process drives the yarn to fully contact and absorb the solution through the roller, which greatly avoids water consumption and crosslinking agent loss. Almost all the crosslinking agent can be absorbed by the yarn, achieving a high utilization rate of the crosslinking agent and reducing production costs.

[0054] Sponge 6 has good hygroscopicity and can absorb excess solution on the yarn surface and replenish solution for yarn that is not fully soaked. In addition, the high resilience physical property of sponge 6 prevents it from damaging the surface hairiness and internal structure of the yarn, and can maintain its good performance for a longer time without deformation or damage, which not only protects the yarn but also enables control of the optimal amount of cross-linking agent.

[0055] Traditional oven drying uses hot air convection to evaporate the moisture on the sample surface. In this drying method, the drying speed is greatly affected by the sample thickness and sample quantity. Since baking temperature and baking time are the two most important factors affecting the cross-linking effect, in actual production, oven baking will inevitably cause the surface yarn of the skein or cheese yarn to be over-dried and the internal yarn to be too humid. The inner and outer layers of the yarn cannot reach the baking temperature at the same time, and it is difficult to control the baking time; this not only causes great damage to the strength of the surface yarn, but also cannot guarantee the cross-linking effect inside the yarn. Using roller heating, the yarn and the roller surface are directly in contact with the heat transfer heating method. A single yarn can absorb heat evenly, and the baking temperature and time are always consistent, which can achieve precise controllability. The yarn cross-linking effect is very uniform and stable, which completely solves the problem that traditional oven heating cannot cross-link evenly inside and outside.

[0056] The present application is described in detail below through specific embodiments. The following embodiments are only partial embodiments of the present application and are not limitations of the present application.

[0057] Embodiment 1:

[0058] A method for anti-fibrillation finishing of lyocell yarn comprises the following steps:

[0059] (1) Prepare finishing liquid: add 100 g / L urea-formaldehyde resin and 30 g / L magnesium chloride respectively, stir evenly to make the resin and catalyst fully dissolved in water, and set aside;

[0060] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly. The bath ratio of yarn to finishing liquid is 1:3.

[0061] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated under tension through a flexible water-absorbing component, and the liquid carrying rate of a single yarn is controlled to be 60%;

[0062] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying heating component, and the yarn is continuously and evenly dried while the yarn is output. The rotation speed of the drying heating component is 200 m / min, the drying temperature is 80°C, and the drying time is 6 s.

[0063] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 200 m / min, the baking temperature is 160°C, and the drying time is 3 s.

[0064] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0065] Embodiment 2:

[0066] (1) Prepare finishing liquid: add 60 g / L of dimethylolethylene urea (DMEU) resin and 12 g / L of citric acid, stir evenly to fully dissolve the resin and catalyst in water, and set aside;

[0067] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly. The bath ratio of yarn to finishing liquid is 1:3.

[0068] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated under tension through a flexible water-absorbing component to control the liquid carrying rate of a single yarn to be 100%;

[0069] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying heating component, and the yarn is continuously and evenly dried while the yarn is output. The rotation speed of the drying heating component is 300 m / min, the drying temperature is 100°C, and the drying time is 3 s.

[0070] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 400 m / min, the baking temperature is 170°C, and the drying time is 1 s.

[0071] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0072] Embodiment 3:

[0073] A method for anti-fibrillation finishing of lyocell yarn comprises the following steps:

[0074] (1) Prepare finishing liquid: add 80 g / L of etherified modified dimethylol dihydroxyethylene urea resin and 24 g / L of magnesium chloride, stir evenly to fully dissolve the resin and catalyst in water, and set aside;

[0075] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly. The bath ratio of yarn to finishing liquid is 1:3.

[0076] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated by a flexible water-absorbing component under tension, and the liquid carrying rate of a single yarn is controlled to be 80%;

[0077] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying heating component, and the yarn is continuously and evenly dried while the yarn is output. The rotation speed of the drying heating component is 500 m / min, the drying temperature is 160°C, and the drying time is 1.13 s.

[0078] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 400 m / min, the baking temperature is 200°C, and the drying time is 0.9 s.

[0079] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0080] Embodiment 4:

[0081] The same parts of this embodiment as those of embodiment 3 are not described in detail, and the difference lies in that:

[0082] (5) Contact baking: The single yarn obtained after drying is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 400 m / min, the baking temperature is 180°C, and the drying time is 0.9 s.

[0083] Embodiment 5:

[0084] The same parts of this embodiment as those of Embodiments 3 and 4 are not described in detail, and the difference lies in that:

[0085] (5) Contact baking: The single yarn obtained after drying is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 400 m / min, the baking temperature is 160°C, and the drying time is 0.9 s.

[0086] Embodiment 6:

[0087] A method for anti-fibrillation finishing of lyocell yarn comprises the following steps:

[0088] (1) Prepare finishing liquid: add 90g / L melamine-formaldehyde resin and 27g / L sodium fluoroborate respectively, stir evenly to make the resin and catalyst fully dissolved in water, and set aside;

[0089] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly. The bath ratio of yarn to finishing liquid is 1:3.

[0090] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated by a flexible water-absorbing component under tension, and the liquid carrying rate of a single yarn is controlled to be 80%;

[0091] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying heating component, and the yarn is continuously and evenly dried while the yarn is output. The rotation speed of the drying heating component is 300 m / min, the drying temperature is 120°C, and the drying time is 3 s.

[0092] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 300 m / min, the baking temperature is 160°C, and the drying time is 3 s.

[0093] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0094] Embodiment 7:

[0095] A method for anti-fibrillation finishing of lyocell yarn comprises the following steps:

[0096] (1) Prepare finishing liquid: add 100 g / L of etherified modified dimethylol dihydroxyethylene urea resin and urea-formaldehyde resin, and 30 g / L of a mixture of citric acid and sodium fluoroborate, respectively, stir evenly to fully dissolve the resin and catalyst in water, and set aside;

[0097] (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly. The bath ratio of yarn to finishing liquid is 1:3.

[0098] (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated under tension through a flexible water-absorbing component, and the liquid carrying rate of a single yarn is controlled to be 70%;

[0099] (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying heating component, and the yarn is continuously and evenly dried while the yarn is output. The rotation speed of the drying heating component is 700 m / min, the drying temperature is 160° C., and the drying time is 0.5 s.

[0100] (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking heating component. While the yarn is output, the yarn is continuously and evenly baked and cross-linked. The rotation speed of the baking heating component is 700 m / min, the baking temperature is 200°C, and the drying time is 0.5 s.

[0101] (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

[0102] The performance test results of the lyocell yarns prepared by the anti-fibrillation finishing method and device in Examples 3-5 of the present invention are as follows:

[0103] The cross-linking effect was tested by washing method:

[0104] The present invention conducted 9 experiments at three baking temperatures of 160°C, 180°C and 200°C, with the resin and catalyst being 70g / L (21g / L), 80g / L (24g / L) and 90g / L (27g / L), respectively. The details are as follows:

[0105]

[0106] The single yarn of the final lyocell yarn is prepared into a loose tube, and then woven into a sheet, and then the anti-fibrillation effect of the fabric washing is tested; according to ISO 6330:2012, MOD 4N washing procedure, the sample and the washing are washed and dried. One sample is reserved as a control sample, and the other samples and washings are put into the washing machine together; the sample and washing are washed.

[0107] The above washing process was repeated 5 times, and the sample and the washing were dried. The changes in fiber fibrillation were observed under a microscope. The test samples were selected from lyocell fibers and fabrics obtained when the resin and catalyst were 80 g / L and 24 g / L, respectively, and the baking temperatures were 200°C, 180°C, and 160°C, respectively, i.e., Examples 3-5 of the present invention.

[0108] like Figure 2 As shown, in the lyocell yarn prepared in Example 3, the fibers constituting the yarn present a relatively smooth surface, and there are no obvious cracks on the surface of the fibers. This indicates that the finishing method of the present invention does not cause damage to the fiber surface, thereby ensuring the basic mechanical properties of the fiber.

[0109] like Figure 3-5 As shown, when the additive is 80g / L and the baking is carried out at 160°C, fibrils appear locally on the fabric woven from the yarn after washing, and the fibrillation range is smaller than that of the untreated fabric, and the fibrillation has an anti-fibrillation effect; when the additive is 80g / L and the baking is carried out at 180°C, fibrils begin to appear on the surface of the fabric woven from the yarn after washing, and the fibrillation range is smaller than that of the untreated fabric and the fibrils produced are shorter, and the fibrillation has an obvious anti-fibrillation effect; when the additive is 80g / L and the baking is carried out at 200°C, there is almost no fibrillation on the surface of the fabric woven from the yarn after washing, which is in obvious contrast to the untreated fabric, and the fibrillation has an obvious anti-fibrillation effect. Therefore, Example 3 of the present invention is the best embodiment.

[0110] The technology can attach the desired chemical on a single yarn. Lyocell yarn is continuously treated with a crosslinker solution and the absorption rate is controlled at 60%-100% by a sponge. After the yarn is dried, it is baked at a higher temperature to crosslink the original fibers. The results show that the treated yarn and fabric have good anti-fibrillation properties after washing for 5 hours. Compared with traditional processing technology, this process has the advantages of good air permeability, low water consumption and less wastewater discharge. The green and sustainable method developed can be used for the finishing of various yarns.

[0111] The present invention uses etherified modified 2D resin for cross-linking. After the hydroxyl groups at positions 4 and 5 are replaced by ethoxy groups, the transposition reaction is prevented, which correspondingly improves the hydrolysis stability of the cross-linked bonds and effectively reduces the amount of formaldehyde released. Not only does it make the cellulose have unique properties such as low swelling rate, enhanced wrinkle resistance and excellent anti-fibrillation effect, but most importantly, the whiteness and air permeability of the textiles can also reach a relatively satisfactory level. The cross-linking agent has a simple synthesis process and is cheap. The shelf life of the cross-linking agent is prolonged and can be stored for one year or even longer, and the strength of the product is basically unchanged. It has good anti-fibrillation effect and good washability, and the formaldehyde release meets the standard, which greatly reduces the harm to the human body and the environment. It is suitable for industrial promotion and application.

[0112] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A method for anti-fibrillation finishing of lyocell yarn, characterized in that: The steps include: (1) Prepare finishing liquid: add a certain mass fraction of resin and catalyst respectively, stir evenly, make the resin and catalyst fully dissolved in water, and set aside; (2) Continuous immersion: Continuously immerse a single yarn in the finishing liquid so that the yarn absorbs the finishing liquid evenly; (3) Controlling the liquid carrying rate: The yarn evenly impregnated with the finishing liquid is treated under tension through a flexible water-absorbing component; (4) Contact drying: The yarn obtained in step (3) is wound on the surface of a rotating drying and heating component, and the yarn is continuously and evenly dried while the yarn is output; (5) Contact baking: The single yarn obtained after the drying treatment in step (4) is wound on the surface of a rotating baking and heating component, and the yarn is continuously and uniformly baked and cross-linked while the yarn is output; (6) Winding: The baked and cross-linked lyocell yarn is continuously wound onto a yarn tube to obtain the anti-fibrillation lyocell yarn.

2. The anti-fibrillation finishing method of lyocell yarn according to claim 1, characterized in that: In the step (1), the resin is any one or more of etherified modified dimethylol dihydroxyethylene urea resin, urea-formaldehyde resin, dimethylol ethylene urea (DMEU) resin, and melamine-formaldehyde resin, and the catalyst is one or more of magnesium chloride, citric acid, and sodium fluoroborate.

3. The anti-fibrillation finishing method of lyocell yarn according to claim 1, characterized in that: In the step (1), the mass fraction of the resin is 60-100 g / L, and the mass fraction of the catalyst is 12-30 g / L.

4. The anti-fibrillation finishing method of lyocell yarn according to claim 1, characterized in that: In the step (3), the liquid carrying rate of a single yarn is controlled to be 60%-100% by the flexible water-absorbing component.

5. The anti-fibrillation finishing method of lyocell yarn according to claim 1, characterized in that: In the step (4), the rotation speed of the drying heating component is 200-700 m / min, the drying temperature is 80-160° C., and the drying time is 0.5-6 s.

6. The anti-fibrillation finishing method of lyocell yarn according to claim 1, characterized in that: In the step (5), the rotation speed of the heating component during baking is 200-700 m / min, the baking temperature is 160-200° C., and the baking time is 0.5-3 s.

7. The anti-fibrillation finishing method of lyocell yarn according to claim 5 or 6, characterized in that: In step (3), the flexible water-absorbing component is a sponge, in steps (4) and (5), the drying and heating component is a drying roller, and the baking and heating component is a baking roller, and the yarn is sequentially wound around the surfaces of the drying roller and the baking roller along the conveying direction, and rotates synchronously with the drying roller and the baking roller respectively.

8. A device for implementing the anti-fibrillation finishing method of lyocell yarn according to any one of claims 1 to 6, characterized in that: include: A working tank for placing finishing liquid; A transmission roller for driving the lyocell yarn to be treated into the working tank and impregnating the lyocell yarn; A flexible water-absorbing component for controlling the liquid carrying rate of the impregnated lyocell yarn and driving the yarn output; A drying and heating component and a baking and heating component for contact drying and baking and cross-linking the output lyocell yarn; A yarn tube for winding the lyocell yarn after baking and cross-linking treatment. The drying heating component and the baking heating component are respectively a drying roller and a baking roller extending perpendicularly to the conveying direction of the Lyocell yarn. The Lyocell yarn is sequentially wound around the surfaces of the drying roller and the baking roller, forming a conveying area between the drying roller and the baking roller for moving the dried yarn toward the baking roller.

9. The device according to claim 8, characterized in that: The flexible water-absorbing component is a sponge that allows the lyocell yarn to pass through.

10. The device according to claim 8, characterized in that: The rotation speed of the drying roller is 500 m / min, the rotation speed of the baking drum is 400 m / min, the drying time is 1.13 s, and the baking time is 0.9 s.

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