Anti-fibrillation treatment process for lyocell fabric constructed based on surface micro-lubricating layer

Abstract

The invention discloses an anti-fibrillation treatment process for lyocell fabric constructed based on a surface micro-lubricating layer, which comprises the following steps: (1) cleaning the lyocell fabric by using a degreasing agent to remove stains and dust on the surface; (2) preparing an amino silicon oil treating fluid with the concentration of 1%-8% owf according to the bath ratio of 1: 50; (3) adjusting the pH value of the amino silicon oil treating fluid to 2-10 by using an acetic acid solution and a sodium carbonate solution with certain concentrations; (4) putting the lyocell fabric and the amino silicon oil treating fluid prepared in the step (3) into an infrared dyeing machine according to a bath ratio, and treating for 30-70 minutes at the temperature of 30-90 DEG C; and (5) after the treatment is completed, taking out the treated lyocell knitted fabric, washing with water at normal temperature, and drying. The problem of fibrillation of the lyocell fabric can be effectively solved, and meanwhile good moisture absorption and permeability, softening performance and dyeing performance are maintained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile functional finishing, and particularly relates to a lyocell fabric anti-fibrillation treatment process based on a surface micro-lubricating layer. BACKGROUND

[0002] Lyocell fiber, as the representative of the third generation of regenerated cellulose fiber, is mainly made of natural wood as raw material, uses non-toxic N-methyl morpholine-N-oxide (NMMO) as solvent, and is spun by dry-jet wet spinning process. The solvent NMMO recovery rate in the spinning process is as high as 99.7%, which can realize the recycling use of the solvent. At the same time, the production process will not produce toxic products such as CS2 and SO2, and the wastewater treatment is simple, which can fundamentally solve the environmental pollution problem of traditional viscose fiber, thereby realizing zero emission. In addition, lyocell fiber combines the moisture and air permeability of cotton fiber, the draping property of viscose fiber, the hand feeling of silk and the high strength of polyester, and has excellent performance, which is a green and low-carbon fiber with great development potential in the future.

[0003] However, due to the special spinning process of lyocell fiber, it forms a skin-core structure with high crystallinity and high orientation. Under wet conditions, when the fiber is subjected to friction, fine fibrils will be split from the surface along the fiber axis, resulting in fibrillation phenomenon, which causes the lyocell fabric to have appearance defects such as pilling, color difference, "white spots" and "frosting", which seriously affects the appearance of the textile, as shown in Figure 1

[0004] The two main influencing factors of lyocell fibrillation are: first, the high swelling of lyocell fiber under wet conditions, which weakens the lateral bonding force inside the fiber; second, the severe friction between fibers and fibers, and between fibers and machines and equipment, which causes the fibrils to peel off from the fiber body and form fibrillation phenomenon. At present, to solve the problem of fibrillation, most of the researches are started from the first influencing factor, that is, lyocell fiber is treated with multi-functional chemical crosslinking agent to form chemical connection between the macromolecular chains of the fiber, so as to enhance the lateral bonding force inside the fiber, limit swelling, and prevent fibrillation. There are also a small amount of researches aiming at the second influencing factor, that is, lyocell fiber is coated with high molecular resin material to reduce direct friction of the fiber. At present, the related patent technologies to solve the above two main factors are as follows:

[0005] ​CN117364512A discloses a process for anti-fibrillation treatment of lyocell dyed fabric, belonging to the field of textile dyeing and finishing technology, comprising the following steps: (1) washing and soaping the dyed lyocell fabric to remove excess dye; (2) preparing a 2-4% (owf) fixing crosslinking agent treatment solution at room temperature, with a bath ratio of 1:3-30, and immersing the washed and soaped lyocell fabric in the treatment solution to allow the fixing crosslinking agent to adsorb evenly on the fabric, the fixing crosslinking agent being one of water-based polyurethane fixing crosslinking agent, cationic polymer fixing crosslinking agent, and polyamine resin fixing crosslinking agent; (3) adjusting the pH of the treatment solution to 4-7 and heating to 40-90°C, and continuing to soak the lyocell fabric for 10-30 min, and draining; (4) washing and softening the treated lyocell fabric, and drying.

[0006] CN114150505A discloses an antibacterial and anti-fibrillation lyocell fiber and a preparation method thereof, comprising, by weight fraction, lyocell fiber 100-200 parts, crosslinking agent 50-200 parts, long carbon chain alkyl tertiary amine 4-10 parts, long carbon chain chlorinated alkyl alcohol 4-10 parts, deionized water 5000-20000 parts, and ethanol 100-500 parts.

[0007] CN119372852 A discloses a method for anti-fibrillation finishing of lyocell yarn, comprising: (1) preparing a finishing solution; (2) continuous immersion: continuously immersing single yarn in the finishing solution to allow the yarn to uniformly absorb the finishing solution; (3) controlling the liquid retention rate: treating the yarn uniformly immersed in the finishing solution under tension by a flexible water absorption component; (4) contact drying: winding the yarn on the surface of a rotating drying heating component, and continuously and uniformly drying the yarn while it is output; (5) contact baking: winding the single yarn on the surface of a rotating baking heating component, and continuously and uniformly baking and crosslinking the yarn while it is output; and (6) winding: obtaining anti-fibrillation lyocell yarn.

[0008] From the above patent, the prior art has solved the two main factors affecting the current lyocell fibrillation, and achieved good anti-fibrillation effect, but there are still some other problems. The method of using multi-functional chemical crosslinking agent to treat lyocell fiber to form chemical connection between fiber macromolecular chains to enhance the transverse binding force of the fiber, limit swelling, to prevent the formation of fibrillation, often through a complex chemical reaction process, and the treated lyocell fabric loses the reaction ability with dyes due to the participation of a large number of hydroxyl groups in the crosslinking reaction, resulting in reduced dyeing depth. The method of using high molecular resin material to coat the surface of lyocell fiber to reduce the direct friction of the fiber has a great influence on the moisture permeability, hand feeling and dyeing property of lyocell. That is, the existing anti-fibrillation treatment method inevitably affects the dyeing performance and wearability of lyocell fabric.

[0009] In summary, how to solve the problem of lyocell fabric fibrillation while avoiding the influence on the moisture permeability, hand feeling and dyeing performance of lyocell fabric, simplifying the process flow, effectively reducing the production cost and realizing industrial application has become a difficult problem that biomedicine material field technical personnel need to solve urgently. SUMMARY

[0010] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a lyocell fabric anti-fibrillation treatment process based on surface micro-lubricating layer construction, which can effectively solve the problem of lyocell fabric fibrillation while maintaining good moisture permeability, softness and dyeing performance.

[0011] To solve the above technical problems, the technical scheme adopted by the present application is: a lyocell fabric anti-fibrillation treatment process based on surface micro-lubricating layer construction, characterized in that it comprises the following steps:

[0012] (1) The lyocell fabric is cleaned with a degreasing agent to remove dirt and dust on the surface, and is ready for use;

[0013] (2) An amino silicone oil treatment solution with a concentration of 1%-8% owf is prepared according to a bath ratio of 1:50, and is ready for use;

[0014] (3) A certain concentration of acetic acid solution and sodium carbonate solution are used to adjust the pH value of the amino silicone oil treatment solution to 2-10;

[0015] (4) The lyocell fabric is placed in the infrared dyeing machine with the amino silicone oil treatment solution prepared in step (3) according to the bath ratio, and is treated at a temperature of 30-90℃ for 30-70min;

[0016] (5) After the treatment is completed, the treated lyocell knitted fabric is taken out, washed at room temperature and dried, and the anti-fibrillation treatment is completed.

[0017] The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction, the type of the silicone oil is side amino type, and the amino value is 0.2-0.6mmol / g.

[0018] The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction, in the step (2), the concentration of the amino silicone oil treatment solution is 5%owf.

[0019] The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction, in the step (3), the concentration of the acetic acid solution and the sodium carbonate solution is 0.1mol / L.

[0020] The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction, in the step (3), the pH value of the amino silicone oil treatment solution is 4.

[0021] The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction, in the step (4), the treatment temperature is 60℃, and the treatment time is 40min.

[0022] The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction has the advantages that: different from the traditional lyocell fiber internal chemical cross-linking solution fibrillation problem, the lyocell fabric is modified by the amino silicone oil from the perspective of improving the external mechanical friction of the lyocell fiber, and the anti-fibrillation treatment is realized by a simple method. + The amino silicone oil is firmly anchored on the fiber surface by the electrostatic attraction of the protonated amino cation (-NH3 BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1The SEM image of the fibrillation phenomenon of the untreated lyocell fabric;

[0024] Figure 2 The mechanism diagram of the anti-fibrillation modification process of the lyocell fabric of the present application;

[0025] Figure 3 The XPS spectrum of the lyocell fabric before and after modification by amino silicone oil;

[0026] Figure 4 The SEM images of the untreated lyocell fabric and the lyocell fabric modified under different pH conditions;

[0027] Figure 5 The SEM images of the untreated lyocell fabric and the lyocell fabric modified under different treatment temperature conditions;

[0028] Figure 6 The SEM images of the untreated lyocell fabric and the lyocell fabric modified under different treatment time conditions;

[0029] Figure 7 The SEM images of the untreated lyocell fabric and the lyocell fabric modified under different treatment liquid dosage conditions;

[0030] Figure 8 The surface friction coefficient test comparison chart of the lyocell fabric before and after treatment;

[0031] Figure 9 The water wetting time test comparison chart of the lyocell fabric before and after treatment;

[0032] Figure 10 The fiber diameter change comparison chart of the lyocell fabric before and after treatment in air and deionized water;

[0033] Figure 11 The surface Zeta potential test curve chart of the lyocell fabric before and after treatment under different pH conditions;

[0034] Figure 12 The K / S value performance test comparison chart of the lyocell fabric before and after treatment by different reactive dyes. DETAILED DESCRIPTION

[0035] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0036] An anti-fibrillation treatment process for lyocell fabric based on surface micro-lubricating layer construction, comprising the following steps:

[0037] (1) The lyocell fabric is cleaned by using a degreasing agent to remove surface stains and dust for standby;

[0038] (2), prepare amino silicone oil treatment solution with concentration of 1%-8% owf according to bath ratio 1:50, standby;

[0039] (3), use certain concentration of acetic acid solution and sodium carbonate solution to adjust the pH value of amino silicone oil treatment solution to 2-10;

[0040] (4), according to bath ratio, place lyocell fabric and amino silicone oil treatment solution prepared in step (3) in infrared dyeing machine, and treat at 30℃-90℃ for 30min-70min;

[0041] (5), after treatment, take out the treated lyocell knitted fabric, wash at room temperature and dry, and complete the anti-fibrillation treatment.

[0042] In the preparation of the amino silicone oil treatment solution of the application, the type of silicone oil used is side amino type, and the amino value is 0.2-0.6mmol / g. In step (3), the concentration of acetic acid solution and sodium carbonate solution is 0.1mol / L.

[0043] As shown in Figure 2 When pH=4-5, the amino group (-NH2) in amino silicone oil is completely protonated into amino cation (-NH3 + ), so that the amino silicone oil has positive charge. The lyocell fiber remains negative due to the dissociation of surface hydroxyl (-OH), and the amino silicone oil and the fiber surface produce strong electrostatic interaction, thereby driving the adsorption of amino silicone oil to the fiber surface. In addition, the protonated amino hydrogen can act as a hydrogen bond donor to form a hydrogen bond with the oxygen atom of the lyocell fiber surface hydroxyl (-OH), further promoting the combination of amino silicone oil and fiber surface, thereby forming a uniform and stable lubricating film on the lyocell fiber surface, effectively reducing the direct contact between fibers, thereby significantly reducing the frictional force on the fiber surface during washing process, and reducing the fiber damage caused by severe friction.

[0044] The application will be specifically described below through specific examples, and the following examples are only part of the application and are not a limitation of the application.

[0045] Example 1:

[0046] A lyocell fabric anti-fibrillation treatment process based on surface micro-lubricating layer construction, comprising the following steps:

[0047] (1), use degreasing agent to clean lyocell fabric, remove surface stains and dust, and standby;

[0048] (2), prepare amino silicone oil treatment solution with concentration of 1% owf according to bath ratio 1:50, standby;

[0049] (3) using acetic acid solution with a concentration of 0.1 mol / L and sodium carbonate solution with a concentration of 0.1 mol / L to adjust the pH value of the amino silicone oil treatment solution to 2;

[0050] (4) placing the lyocell fabric and the amino silicone oil treatment solution prepared in step (3) in an infrared dyeing machine at a bath ratio, and treating for 30 min at a temperature of 30°C;

[0051] (5) after the treatment is completed, taking out the treated lyocell knitted fabric, washing at room temperature, and drying to complete the anti-fibrillation treatment.

[0052] Example 2:

[0053] A lyocell fabric anti-fibrillation treatment process based on surface micro-lubricating layer construction includes the following steps:

[0054] (1) using a degreasing agent to clean the lyocell fabric to remove dirt and dust on the surface, and reserving;

[0055] (2) preparing an amino silicone oil treatment solution with a concentration of 2% owf at a bath ratio of 1:50, and reserving;

[0056] (3) using acetic acid solution with a concentration of 0.1 mol / L and sodium carbonate solution with a concentration of 0.1 mol / L to adjust the pH value of the amino silicone oil treatment solution to 3;

[0057] (4) placing the lyocell fabric and the amino silicone oil treatment solution prepared in step (3) in an infrared dyeing machine at a bath ratio, and treating for 40 min at a temperature of 40°C;

[0058] (5) after the treatment is completed, taking out the treated lyocell knitted fabric, washing at room temperature, and drying to complete the anti-fibrillation treatment.

[0059] Example 3:

[0060] A lyocell fabric anti-fibrillation treatment process based on surface micro-lubricating layer construction includes the following steps:

[0061] (1) using a degreasing agent to clean the lyocell fabric to remove dirt and dust on the surface, and reserving;

[0062] (2) preparing an amino silicone oil treatment solution with a concentration of 4% owf at a bath ratio of 1:50, and reserving;

[0063] (3) using acetic acid solution with a concentration of 0.1 mol / L and sodium carbonate solution with a concentration of 0.1 mol / L to adjust the pH value of the amino silicone oil treatment solution to 4;

[0064] (4) The lyocell fabric and the amino silicone oil treatment solution prepared in step (3) are placed in an infrared dyeing machine according to the bath ratio, and treated at a temperature of 50 DEG C for 50 min;

[0065] (5) After the treatment is completed, the treated lyocell knitted fabric is taken out, washed at room temperature, and dried to complete the anti-fibrillation treatment.

[0066] Example 4:

[0067] (1) The lyocell fabric is cleaned with a degreasing agent to remove dirt and dust on the surface, and is prepared for use;

[0068] (2) An amino silicone oil treatment solution with a concentration of 5% owf is prepared according to a bath ratio of 1:50, and is prepared for use;

[0069] (3) The pH value of the amino silicone oil treatment solution is adjusted to 4 using an acetic acid solution with a concentration of 0.1 mol / L and a sodium carbonate solution with a concentration of 0.1 mol / L;

[0070] (4) The lyocell fabric and the amino silicone oil treatment solution prepared in step (3) are placed in an infrared dyeing machine according to the bath ratio, and treated at a temperature of 60 DEG C for 40 min;

[0071] (5) After the treatment is completed, the treated lyocell knitted fabric is taken out, washed at room temperature, and dried to complete the anti-fibrillation treatment.

[0072] Example 5:

[0073] A lyocell fabric anti-fibrillation treatment process based on a surface micro-lubricating layer structure includes the following steps:

[0074] (1) The lyocell fabric is cleaned with a degreasing agent to remove dirt and dust on the surface, and is prepared for use;

[0075] (2) An amino silicone oil treatment solution with a concentration of 5% owf is prepared according to a bath ratio of 1:50, and is prepared for use;

[0076] (3) The pH value of the amino silicone oil treatment solution is adjusted to 4 using an acetic acid solution with a concentration of 0.1 mol / L and a sodium carbonate solution with a concentration of 0.1 mol / L;

[0077] (4) The lyocell fabric and the amino silicone oil treatment solution prepared in step (3) are placed in an infrared dyeing machine according to the bath ratio, and treated at a temperature of 70 DEG C for 40 min;

[0078] (5) After the treatment is completed, the treated lyocell knitted fabric is taken out, washed at room temperature, and dried to complete the anti-fibrillation treatment.

[0079] Example 6:

[0080] A lyocell fabric anti-fibrillation treatment process based on a surface micro-lubricating layer structure comprises the following steps:

[0081] (1) The lyocell fabric is cleaned with a degreasing agent to remove dirt and dust on the surface, and is prepared for use;

[0082] (2) An amino silicone oil treatment solution with a concentration of 6% owf is prepared according to a bath ratio of 1:50, and is prepared for use;

[0083] (3) The pH value of the amino silicone oil treatment solution is adjusted to 8 by using an acetic acid solution with a concentration of 0.1 mol / L and a sodium carbonate solution with a concentration of 0.1 mol / L;

[0084] (4) The lyocell fabric is placed in an infrared dyeing machine with the amino silicone oil treatment solution prepared in step (3) according to a bath ratio, and is treated at a temperature of 30 DEG C for 30 min;

[0085] (5) After the treatment is completed, the treated lyocell fabric is taken out, is washed at room temperature, and is dried to complete the anti-fibrillation treatment.

[0086] Example 7:

[0087] A lyocell fabric anti-fibrillation treatment process based on a surface micro-lubricating layer structure comprises the following steps:

[0088] (1) The lyocell fabric is cleaned with a degreasing agent to remove dirt and dust on the surface, and is prepared for use;

[0089] (2) An amino silicone oil treatment solution with a concentration of 8% owf is prepared according to a bath ratio of 1:50, and is prepared for use;

[0090] (3) The pH value of the amino silicone oil treatment solution is adjusted to 10 by using an acetic acid solution with a concentration of 0.1 mol / L and a sodium carbonate solution with a concentration of 0.1 mol / L;

[0091] (4) The lyocell fabric is placed in an infrared dyeing machine with the amino silicone oil treatment solution prepared in step (3) according to a bath ratio, and is treated at a temperature of 90 DEG C for 70 min;

[0092] (5) After the treatment is completed, the treated lyocell fabric is taken out, is washed at room temperature, and is dried to complete the anti-fibrillation treatment.

[0093] The performance test results of the lyocell fabric prepared by the treatment process of the application are as follows:

[0094] 1. About the surface micro-lubricating layer:

[0095] Since the micro-lubricating layer constructed on the surface of the lyocell fabric is very thin, its thickness is difficult to measure, and the characterization of the micro-lubricating layer is as follows: Figure 3As shown in the comparison of XPS spectra of lyocell knitted fabrics before and after amino silicone oil modification, it is clear that the untreated lyocell knitted fabric surface only shows two characteristic peaks, C 1s and O 1s, while the Si-lyocell knitted fabric (the lyocell knitted fabric treated in this invention) shows a significant Si 2p peak, indicating that the amino silicone oil has been successfully coated on the lyocell fiber surface. The specific elements and contents on the modified lyocell fiber surface are shown in Table 1.

[0096] Table 1: Comparison of Surface Element Content of Different Fabrics

[0097]

[0098] As shown in Table 1, the element content on the surface of lyocell fibers is as follows: the Si and N content on the surface of the modified Si-lyocell knitted fabric is 7.59% and 1.43%, respectively, while the unmodified fabric does not contain these two elements, further demonstrating the successful modification of lyocell fabric by amino silicone oil.

[0099] 2. The influence of different parameter conditions on antifibrillation performance:

[0100] (1) Under different pH conditions:

[0101] like Figure 4 As shown, under the conditions of 4% owf amino silicone oil, treatment temperature of 60℃, and treatment time of 40 min, regarding the fibrillation of Si-lyocell knitted fabrics at different pH values, the fibrillation phenomenon on the surface of Si-lyocell knitted fabrics showed a trend of first weakening and then strengthening with increasing pH value. At lower pH values, the amino groups in amino silicone oil tend to accept protons (H... + It then undergoes protonation to form a positively charged amino cation (-NH3). + Due to the presence of positive charge, amino silicone oil molecules exhibit electrostatic attraction with negatively charged lyocell fibers, promoting the bonding between the amino silicone oil and the lyocell knitted fabric. At pH=4, the zeta potential of the amino silicone oil treatment solution reaches its maximum, generating a very strong electrostatic attraction with the negatively charged lyocell fiber surface, causing silicone oil molecules to rapidly and densely adsorb onto the lyocell fiber surface. As the pH value increases, the protonation ability of the amino group weakens, the positive charge carried by the amino silicone oil molecules decreases, and the electrostatic adsorption with the lyocell fiber surface weakens, resulting in a decrease in the silicone oil's coverage on the lyocell fiber surface and thus a reduction in lubrication effect. Overall, pH=4 is the most suitable reaction condition.

[0102] (2) Under different processing temperatures:

[0103] likeFigure 5 As shown, under the conditions of 4% owf amino silicone oil, pH=4, and a treatment time of 40 min, the fibrillation tendency of Si-lyocell knitted fabrics at different treatment temperatures showed a trend of first decreasing and then increasing with increasing treatment temperature. At lower temperatures, the reaction between amino silicone oil molecules and lyocell fibers was relatively slow, failing to form a complete protective layer on the lyocell fiber surface. Due to the poor stability of the protective layer, its ability to reduce friction between fibers was weak; therefore, fibrillation still existed on the surface of Si-lyocell knitted fabrics at lower reaction temperatures. Simultaneously, increasing the treatment temperature promoted the movement of cellulose molecular chains, increasing the accessibility of hydroxyl groups, thereby enhancing the reactivity with amino silicone oil. Within an appropriate temperature range, the interaction between amino silicone oil and lyocell fibers reached its optimal state, forming a stable protective layer on the fiber surface. This layer lubricated the fibers and enhanced their anti-friction ability, effectively inhibiting fibrillation of lyocell fibers. Considering energy consumption and overall fabric performance, a treatment temperature of 60℃ was deemed appropriate.

[0104] (3) Under different processing time conditions:

[0105] like Figure 6 As shown, under the conditions of 4% owf amino silicone oil, pH=4, and treatment temperature of 60℃, the antigen fibrillation performance of Si-lyocell knitted fabrics gradually improves with increasing treatment time. After a certain treatment time, further extending the treatment time does not further improve the antigen fibrillation performance of Si-lyocell knitted fabrics. At shorter treatment times, the interaction between amino silicone oil and lyocell fibers is limited, failing to form a uniform and stable protective layer. With longer treatment times, amino silicone oil molecules have sufficient time to fully combine with the fiber surface, forming a stable protective layer, significantly improving the lubricity and anti-friction properties of lyocell fibers, thereby reducing fibrillation. Simultaneously, extending the treatment time allows for a more uniform distribution of silicone oil on the fiber surface, further enhancing its lubricating effect and effectively reducing surface damage during friction and stretching, thus inhibiting fibrillation. Considering energy consumption and process efficiency, a treatment time of 40 minutes for amino silicone oil is more appropriate.

[0106] (4) Under different dosages of amino silicone oil treatment solution:

[0107] like Figure 7As shown, under the conditions of pH=4, treatment temperature of 70℃, and treatment time of 40 min, with the increase of amino silicone oil dosage, the fibrils on the surface of Si-lyocell knitted fabric gradually decreased, and the fibrillation tendency gradually declined. When the amino silicone oil dosage reached 5% owf, almost no fibrillation appeared on the surface of Si-lyocell knitted fabric, indicating that amino silicone oil modification can effectively inhibit fibrillation. With the increase of amino silicone oil dosage, the adsorption of amino silicone oil to lyocell fibers is more complete, and amino silicone oil molecules can form a more uniform lubricating protective layer on the fiber surface, reducing frictional damage between fibers and thus improving the fibrillation performance of lyocell. When the amino silicone oil dosage exceeds 5% owf, its increase does not further improve the fibrillation performance of lyocell. Therefore, 5% owf of amino silicone oil is the optimal treatment dosage, which can effectively inhibit the fibrillation phenomenon of fibers while avoiding the resource waste that may be caused by overtreatment.

[0108] 3. Regarding the surface friction coefficient:

[0109] To investigate the effect of amino silicone oil treatment on the surface friction coefficient of lyocell knitted fabrics, such as... Figure 8 As shown, silicone oil imparts a smooth surface to fibers, effectively reducing the surface friction coefficient. After treatment with amino silicone oil, the surface friction coefficient of Si-lyocell knitted fabrics significantly decreased. The amino groups in amino silicone oil molecules readily protonate to generate a positive charge, leading to strong electrostatic interactions and hydrogen bonding with lyocell fibers. This uniformly coats the lyocell fiber surface, forming a lubricating protective film that significantly reduces the friction coefficient of the lyocell knitted fabric. Furthermore, the siloxane segments in amino silicone oil possess low surface energy and good flexibility, effectively reducing the adhesion between lyocell fibers and other materials, further lowering the friction coefficient. Simultaneously, as a softener, amino silicone oil reduces entanglement between lyocell fibers, making the fabric softer and allowing fibers to slide more easily under mechanical forces, reducing frictional damage during washing and thus minimizing fibrillation.

[0110] 4. Regarding moisture absorption and permeability:

[0111] like Figure 9 , 10 As shown, the effect of amino silicone oil treatment on the hydrophilicity of lyocell knitted fabrics was evaluated by comparing the wetting time of different fabrics and the change in fiber diameter after the fabrics absorbed water. Figure 9The water wetting time of untreated lyocell and Si-lyocell knitted fabric is shown. After the treatment of amino silicone oil, the water wetting time of Si-lyocell knitted fabric has no obvious change. The surface of untreated lyocell knitted fabric is rich in hydrophilic hydroxyl (-OH), which gives it excellent water absorption performance. Water molecules can quickly form hydrogen bonds with the hydroxyl groups on the surface of the fiber, causing the water droplet to complete the spread and penetration in an instant, showing a shorter wetting time (about 67 ms). Although the amino silicone oil treatment can theoretically form a surface protection layer through hydrogen bonds or chemical bonds with the cellulose hydroxyl (-OH), the hydrophilic amino silicone oil used in the experiment did not significantly change the hydrophilic properties of the fiber.

[0112] The change of fiber diameter of untreated lyocell and Si-lyocell fiber in air and deionized water is shown in Figure 10 In deionized water, the diameter of untreated lyocell fiber changes from 10.1 μm to 14.0 μm, and after the treatment of amino silicone oil, the fiber diameter of Si-lyocell knitted fabric changes from 10.01 μm to 13.8 μm, which has little change compared with untreated lyocell fiber, which further indicates that the modification of amino silicone oil does not change the water absorption performance of lyocell fabric.

[0113] 5. About dyeing performance:

[0114] As shown in Figure 11 From the figure, it can be seen that the surface zeta potential of lyocell fabric treated by the present application is obviously more positive than that of untreated fabric. Since the dye itself is negatively charged, the treated lyocell fabric can greatly reduce the repulsive force between the dye and improve the adsorption capacity of the dye.

[0115] As shown in Figure 12The K / S values of Si-lyocell knitted fabrics prepared under the conditions of 5% owf of amino silicone oil, pH = 4, treatment temperature 70°C, and treatment time 40 min were tested and the K / S values of lyocell knitted fabrics and Si-lyocell knitted fabrics dyed with different reactive dyes were shown. As can be seen from the figure, after the treatment of amino silicone oil, the K / S values of reactive yellow 15, reactive blue 19 and reactive red 218 are all improved, while the K / S value of reactive yellow 145 is slightly decreased. The treatment of amino silicone oil can reduce the negative charge on the surface of lyocell fibers, thereby reducing the electrostatic repulsion between the reactive dyes and the fibers, promoting the adsorption of the dyes on the fibers to a certain extent, improving the dye uptake of the reactive dyes, and thus increasing the K / S value of Si-lyocell knitted fabrics. In summary, the treatment of amino silicone oil has no significant negative impact on the dyeing depth of lyocell knitted fabrics, and can improve the dyeing effect in most cases, especially when treating dyes such as reactive yellow 15, reactive blue 19 and reactive red 218, which shows a certain dyeing improvement effect.

[0116] Color fastness is an important indicator to measure the performance of dyed fabrics. Table 2 shows the color fastness of lyocell knitted fabrics and Si-lyocell knitted fabrics dyed with different reactive dyes. Specifically as follows:

[0117] Table 2: Color fastness of lyocell and Si-lyocell knitted fabrics dyed with different reactive dyes

[0118]

[0119] As can be seen from Table 2, the color fastness of untreated lyocell knitted fabrics and amino silicone oil treated Si-lyocell knitted fabrics remains basically the same, both of which show good color fastness grade. Amino silicone oil mainly coats on the surface of lyocell fibers through electrostatic attraction between positive and negative charges and hydrogen bonding, and does not crosslink with the hydroxyl groups (-OH) of cellulose. Reactive dye molecules can still react with the hydroxyl groups of cellulose to form covalent bonds, so that the dye molecules are firmly combined with the fibers, maintaining good color fastness.

[0120] The present application modifies lyocell fiber by amino silicone oil, and the ionized amino group is anchored on the surface of lyocell fiber. Due to the characteristics of long bond length, large bond angle and high free rotation degree of Si-O-Si bond in amino silicone oil, the molecular chain has high flexibility, can form a micro-lubricating layer on the surface of the fiber, reduce the friction coefficient of the surface of lyocell fiber, reduce the friction damage, and achieve the purpose of preventing fibrillation. Compared with the previous treatment method, the advantage of the present treatment process is that the amino silicone oil only modifies the surface of lyocell fiber by electrostatic force, hydrogen bond and other non-covalent forces, and does not reduce the moisture absorption and dyeing performance of the fiber due to occupying a large number of hydroxyl groups. Compared with the method of coating lyocell fiber with resin, the high flexibility of the molecular chain of amino silicone oil does not significantly reduce the hand feeling of lyocell fabric. In addition, the method is simple and easy to operate, and can be completed in the overflow dyeing machine commonly used in the factory.

[0121] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Within the scope of the present application, changes, modifications, additions or substitutions made by those skilled in the art should be within the scope of the present application.

Claims

1. A lyocell fabric anti-fibrillation treatment process based on the construction of a surface micro-lubricating layer, characterized in that, The method comprises the following steps: (1) washing the lyocell fabric with a degreasing agent to remove dirt and dust on the surface, and preparing for use; (2) preparing an amino silicone oil treatment solution with a concentration of 1%-8% owf according to a bath ratio of 1:50, and preparing for use; (3) adjusting the pH value of the amino silicone oil treatment solution to 2-10 by using a certain concentration of acetic acid solution and sodium carbonate solution; (4) placing the lyocell fabric and the amino silicone oil treatment solution prepared in step (3) in an infrared dyeing machine according to a bath ratio, and treating at a temperature of 30-90°C for 30-70 min; (5) after the treatment is completed, taking out the treated lyocell knitted fabric, washing at room temperature, and drying to complete the anti-fibrillation treatment.

2. The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer according to claim 1, characterized in that: The silicone oil is of a side amino type, and the amino value is 0.2-0.6 mmol / g.

3. The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer according to claim 1, characterized in that: In step (2), the concentration of the amino silicone oil treatment solution is 5% owf.

4. The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer according to claim 1, characterized in that: In step (3), the concentration of the acetic acid solution and the sodium carbonate solution is 0.1 mol / L.

5. The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer construction according to claim 1, characterized in that: In step (3), the pH value of the amino silicone oil treatment solution is 4.

6. The lyocell fabric anti-fibrillation treatment process based on the surface micro-lubricating layer according to claim 1, characterized in that: In step (4), the treatment temperature is 60°C, and the treatment time is 40 min.

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