Regenerated cellulose fiber with star-shaped section as well as preparation method and application of regenerated cellulose fiber

Abstract

The invention provides a regenerated cellulose fiber with a star-shaped section and a preparation method and application thereof, and relates to the technical field of textile materials. The invention provides a regenerated cellulose fiber with a star-shaped cross section. The cross section of the regenerated cellulose fiber comprises a first main body, a second main body and a third main body which are mutually crossed and have an intersection point; and the sections of the first main body, the second main body and the third main body are rectangular. The regenerated cellulose fiber provided by the invention can improve the wearing comfort and aesthetic property of fabrics.

Description

Technical Field

[0001] The present invention relates to the technical field of textile materials, and particularly relates to a regenerated cellulose fiber with a star-shaped cross-section, a preparation method thereof, and an application thereof. Background Art

[0002] With the development of the textile industry, the demand for fiber materials is becoming increasingly diversified. Traditional fiber materials have certain limitations in terms of structure, performance, and appearance. In particular, the cross-sectional shape has an important impact on the physical properties of the fiber and the appearance style of the fabric. Therefore, the development of fiber materials with novel cross-sectional structures is of great significance for improving the performance of textiles and meeting market demands. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a regenerated cellulose fiber with a star-shaped cross-section, a preparation method thereof, and an application thereof. The regenerated cellulose fiber provided by the present invention can improve the wearing comfort and aesthetics of the fabric.

[0004] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0005] The present invention provides a regenerated cellulose fiber with a star-shaped cross-section. The cross-section of the regenerated cellulose fiber includes a first main body, a second main body, and a third main body that intersect with each other and have a single intersection point; the cross-sections of the first main body, the second main body, and the third main body are rectangles.

[0006] Preferably, the included angle between the first main body and the second main body is a, where 0° < a < 90°; the included angle between the first main body and the third main body is b, where 0° < b < 90°; the included angle between the second main body and the third main body is c, where 0° < c < 90°.

[0007] Preferably, the length of the rectangle is the main axis; the width of the rectangle is the minor axis;

[0008] The main axis dimensions of the first main body, the second main body, and the third main body are independently 0.5 - 1.2 mm; the minor axis dimensions of the first main body, the second main body, and the third main body are independently 0.05 - 0.1 mm.

[0009] Preferably, the dimensions of the first main body, the second main body, and the third main body are the same.

[0010] Preferably, the center point of the cross-section of the regenerated cellulose fiber coincides with the center points of the first main body, the second main body, and the third main body.

[0011] Preferably, the raw materials for preparing the regenerated cellulose fiber include cottonwood pulp and / or mushroom grass pulp.

[0012] The present invention provides a method for preparing the regenerated cellulose fiber described in the above technical solution, comprising the following steps:

[0013] The spinneret is designed according to the cross-sectional shape of the regenerated cellulose fiber; the spinneret is provided with spinneret holes matching the cross-sectional shape of the regenerated cellulose fiber;

[0014] The regenerated cellulose spinning solution is extruded through the spinneret holes on the spinneret plate and then enters the acid bath solution for reaction to obtain the regenerated cellulose fiber.

[0015] Preferably, the regenerated cellulose spinning solution is obtained by dissolving the raw material for preparing regenerated cellulose fiber in a NaOH solution and then sequentially undergoing xantholysis, filtration and degassing treatments; the maturity of the regenerated cellulose spinning solution is 7.0 to 7.6 mL, and the viscosity is 40 to 45 s.

[0016] Preferably, after entering the acid bath to react, the process further comprises: roller stretching, water washing, drying and winding in sequence.

[0017] The present invention provides the use of the regenerated cellulose fiber described in the above technical solution or the regenerated cellulose fiber prepared by the preparation method described in the above technical solution in fabrics.

[0018] The invention provides a regenerated cellulose fiber with a star-shaped cross section. The regenerated cellulose fiber of the invention has a unique star-shaped cross section, which is close to a circle, so that the fiber has better elasticity and recovery, and improves the wrinkle resistance and shape retention of the fabric. The star-shaped cross-sectional structure increases the contact area between the fiber and the air, which is beneficial to the moisture absorption and perspiration wicking performance of the fiber, and improves the wearing comfort of the fabric. The unique cross-sectional shape of the invention enables the fiber to form a unique texture and style in the fabric, and improves the aesthetics of the fabric.

[0019] The present invention provides a method for preparing the regenerated cellulose fiber described in the above technical solution. The present invention enables the fiber to have a unique star-shaped cross-section through a specific spinning process and spinneret design, thereby improving the physical properties of the fiber and the appearance style of the fabric.

[0020] The present invention provides the use of the regenerated cellulose fiber described in the above technical solution or the regenerated cellulose fiber prepared by the preparation method described in the above technical solution in fabrics.

[0021] In a specific embodiment of the present invention, the beneficial effects of the regenerated cellulose fiber are as follows:

[0022] (1) The star-shaped cross section can enhance the gloss of the fiber, allowing the human eye to receive different optical information in different directions and positions, thus producing sensory perception;

[0023] (2) The regenerated cellulose fiber with a star-shaped cross-section performs excellently in terms of bending resistance and handfeel, and is stiffer than circular fabrics of the same specification because the star-shaped cross-section can increase the lateral strength of the fiber and is more wear-resistant.

[0024] (3) The star-shaped cross-section increases the contact area between the fiber and the acid bath, enabling more sufficient reaction. The physical indexes and whiteness of the fiber increase, and products with relatively thick single-filament deniers can be spun, such as products like 30D / 2F, 40D / 2F, 50D / 2F, etc. Description of the Drawings

[0025] Figure 1 is a schematic cross-sectional view of the spinneret hole;

[0026] Figure 2 is a physical picture of the regenerated cellulose fiber prepared in Example 4. Detailed Embodiments

[0027] The present invention provides a regenerated cellulose fiber with a star-shaped cross-section. The cross-section of the regenerated cellulose fiber includes a first main body, a second main body, and a third main body that intersect with each other and have one intersection point; the cross-sections of the first main body, the second main body, and the third main body are rectangles.

[0028] The regenerated cellulose fiber provided by the present invention has a star-shaped cross-section. In the present invention, the included angle between the first main body and the second main body is a, 0° < a < 90°, specifically, the a can be 50 - 70°, and further can be 60°; the included angle between the first main body and the third main body is b, 0° < b < 90°, specifically, the b can be 50 - 70°, and further can be 60°; the included angle between the second main body and the third main body is c, 0° < c < 90°, specifically, the c can be 50 - 70°, and further can be 60°.

[0029] In the present invention, the first main body, the second main body, and the third main body are rectangles, preferably rectangles. In the present invention, the length of the rectangle is the main axis; the width of the rectangle is the minor axis; the main axis dimensions (i.e., the length of the rectangle) of the first main body, the second main body, and the third main body are independently preferably 0.5 - 1.2 mm, specifically can be 0.8 mm; the minor axis dimensions (i.e., the width of the rectangle) of the first main body, the second main body, and the third main body are independently preferably 0.05 - 0.1 mm, specifically can be 0.06 mm.

[0030] In the specific embodiments of the present invention, the dimensions of the first main body, the second main body, and the third main body are the same.

[0031] In the specific embodiments of the present invention, the center point of the cross-section of the regenerated cellulose fiber coincides with the center points of the first main body, the second main body, and the third main body.

[0032] In the present invention, the raw materials for preparing the regenerated cellulose fiber preferably include cotton pulp and / or mushroom grass pulp, specifically cotton pulp or mushroom grass pulp; the present invention has no special limitation on the sources of the cotton pulp and mushroom grass pulp, and commercially available products familiar to those skilled in the art can be used.

[0033] In a specific embodiment of the present invention, the regenerated cellulose fiber is a continuously spun regenerated cellulose fiber.

[0034] In the present invention, the dry breaking strength of the regenerated cellulose fiber is 1.62-1.69 cn / dtex, and can further be 1.68-1.69 cn / dtex; the wet breaking strength is 0.81-0.87 cn / dtex, and can further be 0.86-0.87 cn / dtex; the dry breaking elongation is 22-26%, and can specifically be 24-26%.

[0035] The present invention provides a method for preparing the regenerated cellulose fiber described in the above technical solution, comprising the following steps:

[0036] The spinneret is designed according to the cross-sectional shape of the regenerated cellulose fiber; the spinneret is provided with spinneret holes matching the cross-sectional shape of the regenerated cellulose fiber;

[0037] The regenerated cellulose spinning solution is extruded through the spinneret holes on the spinneret plate and then enters the acid bath solution for reaction to obtain the regenerated cellulose fiber.

[0038] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0039] The present invention designs a spinneret according to the cross-sectional shape of the regenerated cellulose fiber; the spinneret is provided with spinneret holes matching the cross-sectional shape of the regenerated cellulose fiber. In the present invention, the cross-sectional schematic diagram of the spinneret hole is as follows Figure 1 In the present invention, the cross-sectional structure of the spinneret hole is consistent with the cross-sectional structure of the regenerated cellulose fiber with a star-shaped cross-section as described above, and will not be described in detail here.

[0040] After the spinneret is designed, the present invention extrude the regenerated cellulose spinning solution through the spinneret holes on the spinneret and then enter the acid bath to react, thereby obtaining the regenerated cellulose fiber. In the present invention, the maturity of the regenerated cellulose spinning solution is preferably 7.0-7.6 mL, specifically 7.0 mL, 7.1 mL, 7.2 mL, 7.3 mL, 7.4 mL, 7.5 mL or 7.6 mL; the viscosity is 40-45 s, specifically 40 s, 41 s, 42 s, 43 s, 44 s or 45 s. The regenerated cellulose spinning solution in the embodiment of the present invention is specifically obtained by dissolving the raw material for preparing the regenerated cellulose fiber in a NaOH solution and then subjecting it to yellowing, filtering and degassing treatments in sequence; the concentration of the NaOH solution can be 200-300 g / L, specifically 200 g / L, 230 g / L, 248 g / L, 250 g / L, 270 g / L or 300 g / L; the mass ratio of the raw material for preparing the regenerated cellulose fiber (cotton pulp and / or mushroom grass pulp) to the volume ratio of the NaOH solution can be 1t:20-30m 3 , specifically 1t:20m 3 、1t:23m 3 、1t:25m 3 、1t:26m 3 、1t:27m 3 、1t:28m 3 、1t:29m 3 or 1t:30m 3 The present invention has no special requirements on the specific processes of dissolving, yellowing, filtering and degassing, and the processes well known to those skilled in the art can be adopted.

[0041] In the present invention, the stretching ratio of the regenerated cellulose spinning solution is preferably 30-70%, more preferably 50-70%, specifically 50%, 55%, 60%, 65% or 70%. The present invention controls the stretching ratio of the regenerated cellulose spinning solution within the above range to ensure good spinnability.

[0042] In the present invention, the composition of the acid bath preferably includes sulfuric acid, zinc sulfate and sodium sulfate; the concentration of the sulfuric acid can be 138-150g / L, specifically 138g / L, 140g / L, 142g / L or 150g / L; the concentration of zinc sulfate in the acid bath can be 6-11g / L, specifically 6g / L, 7g / L, 8g / L, 9g / L or 10g / L, and the concentration of sodium sulfate can be 240-280g / L, specifically 240g / L, 250g / L, 255g / L, 260g / L, 270g / L or 280g / L. In the present invention, the temperature of the acid bath is preferably 55-60°C, specifically 55°C, 56°C, 57°C, 58°C, 59°C or 60°C; during the reaction, cellulose sulfonate reacts to generate cellulose.

[0043] In the present invention, after entering the acid bath for reaction, it is preferred that the process further includes: sequentially performing roller stretching, washing, drying and winding. In the present invention, the roller stretching rate is preferably 100-150 m / min, more preferably 100-140 m / min, and specifically can be 100 m / min, 110 m / min, 120 m / min, 126 m / min, 130 m / min or 138 m / min. The present invention has no particular limitation on the washing, drying and winding, and methods well known to those skilled in the art can be used.

[0044] The present invention provides the use of the regenerated cellulose fiber described in the above technical solution or the regenerated cellulose fiber prepared by the preparation method described in the above technical solution in fabrics.

[0045] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The present invention designs the spinneret holes on the spinneret plate as follows Figure 1 As shown, the stretching ratio of the regenerated cellulose spinning solution flow is controlled between 30% and 70% according to the denier, the number of designed holes, the axis length, and the axis width diameter.

[0047] Example 1

[0048] The cotton and wood pulp were dissolved in turn (the solvent used for dissolution was a NaOH solution with a concentration of 248 g / L, and the volume ratio of the mass of the Juncao pulp to the NaOH solution was 1t:25m 3), yellowing, filtering and degassing to obtain a regenerated cellulose spinning solution; the regenerated cellulose spinning solution has a maturity of 7.0 mL and a viscosity of 40 s;

[0049] Set the spinneret as Figure 1 The spinneret hole shown has a hole number of 8F, a major axis dimension of 0.6 mm, and a minor axis dimension of 0.06 mm;

[0050] The regenerated cellulose spinning solution is extruded through the spinneret hole and then enters the acid bath for reaction, and then roller stretching, water washing, drying and winding are performed in sequence to obtain the regenerated cellulose fiber (such as Figure 2 as shown); the stretching ratio of the regenerated cellulose spinning solution stream is 50%; the composition of the acid bath is sulfuric acid, zinc sulfate and sodium sulfate (the concentration of sulfuric acid is 138g / L; the concentration of zinc sulfate in the acid bath is 7g / L, and the concentration of sodium sulfate is 250g / L); the temperature of the acid bath is 58°C; the roller stretching rate is 100m / min.

[0051] Example 2

[0052] The cotton pulp was dissolved in turn (the solvent used for dissolution was a NaOH solution with a concentration of 250 g / L, and the volume ratio of the cotton pulp mass to the NaOH solution was 1t:27m 3 ), yellowing, filtering and degassing to obtain a regenerated cellulose spinning solution; the regenerated cellulose spinning solution has a maturity of 7.2 mL and a viscosity of 42 s;

[0053] Set the spinneret as Figure 1 The spinneret hole shown has a hole number of 6F, a major axis dimension of 0.9 mm, and a minor axis dimension of 0.055 mm;

[0054] The regenerated cellulose spinning solution is extruded through the spinneret hole and then enters the acid bath to react, and then roller stretching, water washing, drying and winding are carried out in sequence to obtain regenerated cellulose fiber; the stretching ratio of the regenerated cellulose spinning solution stream is 60%; the acid bath comprises sulfuric acid, zinc sulfate and sodium sulfate (the concentration of sulfuric acid is 140g / L; the concentration of zinc sulfate in the acid bath is 8g / L, and the concentration of sodium sulfate is 255g / L); the temperature of the acid bath is 57°C; and the roller stretching rate is 120m / min.

[0055] Example 3

[0056] The cotton pulp was dissolved in turn (the solvent used for dissolution was a NaOH solution with a concentration of 250 g / L, and the volume ratio of the cotton pulp mass to the NaOH solution was 1t:28m 3), yellowing, filtering and degassing to obtain a regenerated cellulose spinning solution; the regenerated cellulose spinning solution has a maturity of 7.0 mL and a viscosity of 40 s;

[0057] Set the spinneret as Figure 1 The spinneret hole shown has a hole number of 5F, and its major axis size is 0.8 mm and the minor axis size is 0.07 mm;

[0058] The regenerated cellulose spinning solution is extruded through the spinneret hole and then enters the acid bath to react, and then roller stretching, water washing, drying and winding are performed in sequence to obtain regenerated cellulose fiber; the stretching ratio of the regenerated cellulose spinning solution stream is 55%; the acid bath comprises sulfuric acid, zinc sulfate and sodium sulfate (the concentration of sulfuric acid is 142 g / L; the concentration of zinc sulfate in the acid bath is 9 g / L, and the concentration of sodium sulfate is 260 g / L); the temperature of the acid bath is 59°C; and the roller stretching rate is 126 m / min.

[0059] Example 4

[0060] The cotton pulp was dissolved in turn (the solvent used for dissolution was a NaOH solution with a concentration of 250 g / L, and the volume ratio of the cotton pulp mass to the NaOH solution was 1t:29m 3 ), yellowing, filtering and degassing to obtain a regenerated cellulose spinning solution; the regenerated cellulose spinning solution has a maturity of 7.5 mL and a viscosity of 44 s;

[0061] Set the spinneret as Figure 1 The spinneret shown has a hole number of 4F, a major axis dimension of 1 mm, and a minor axis dimension of 0.05 mm;

[0062] The regenerated cellulose spinning solution is extruded through the spinneret hole and then enters the acid bath for reaction, and then roller stretching, water washing, drying and winding are performed in sequence to obtain regenerated cellulose fibers (the finished product of the regenerated cellulose fibers is shown in FIG. Figure 2 as shown); the stretching ratio of the regenerated cellulose spinning solution stream is 70%; the composition of the acid bath is sulfuric acid, zinc sulfate and sodium sulfate (the concentration of sulfuric acid is 150g / L; the concentration of zinc sulfate in the acid bath is 10g / L, and the concentration of sodium sulfate is 270g / L); the temperature of the acid bath is 56°C; the roller stretching rate is 138m / min.

[0063] Comparative Example 1

[0064] The preparation method is basically the same as that of Example 1, except that the cross section of the spinneret hole is cross-shaped.

[0065] Test Case

[0066] The properties of the regenerated cellulose fibers prepared in Examples 1 to 4 and Comparative Example 1 were tested according to the enterprise standard QB / XX J30-2020, and the results are shown in Table 1. In Table 1, the test standard for dry breaking strength is greater than 1.6 cn / dtex, the test standard for wet breaking strength is greater than 0.75 cn / dtex, and the test standard for dry breaking elongation is greater than 14%. As can be seen from Table 1, the regenerated cellulose fibers prepared in Examples 1 to 4 of the present invention have excellent comprehensive properties, and the regenerated cellulose fibers prepared in Example 4 have the best performance.

[0067] Table 1 Properties of regenerated cellulose fibers prepared in Examples 1 to 4 and Comparative Example 1

[0068] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Dry breaking strength 1.62cn / dtex 1.65cn / dtex 1.68cn / dtex 1.69cn / dtex 1.58cn / dtex Wet breaking strength 0.81cn / dtex 0.85cn / dtex 0.86cn / dtex 0.87cn / dtex 0.80cn / dtex Dry elongation at break 22％ 25％ 24％ 26％ 20％

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A regenerated cellulose fiber with a star-shaped cross-section, wherein the cross-section of the regenerated cellulose fiber comprises a first body, a second body and a third body that intersect with each other and have an intersection point; the cross-sections of the first body, the second body and the third body are rectangular.

2. The regenerated cellulose fiber according to claim 1, characterized in that The included angle between the first body and the second body is a, where 0° < a < 90°; the included angle between the first body and the third body is b, where 0° < b < 90°; the included angle between the second body and the third body is c, where 0° < c < 90°.

3. The regenerated cellulose fiber according to claim 1 or 2, characterized in that The length of the rectangle is the main axis; the width of the rectangle is the minor axis. The main axis dimensions of the first body, the second body and the third body are independently 0.5 to 1.2 mm; the minor axis dimensions of the first body, the second body and the third body are independently 0.05 to 0.1 mm.

4. The regenerated cellulose fiber according to claim 3, characterized in that The first body, the second body and the third body have the same dimensions.

5. The regenerated cellulose fiber according to claim 1 or 4, characterized in that The center point of the cross-section of the regenerated cellulose fiber coincides with the center points of the first body, the second body and the third body.

6. The regenerated cellulose fiber according to claim 1, characterized in that The raw materials for preparing the regenerated cellulose fiber include cottonwood pulp and / or mushroom grass pulp.

7. The preparation method of the regenerated cellulose fiber according to any one of claims 1 to 6, comprising the following steps: Design a spinneret according to the cross-sectional shape of the regenerated cellulose fiber; the spinneret is provided with spinneret holes matching the cross-sectional shape of the regenerated cellulose fiber. Extrude the regenerated cellulose spinning solution through the spinneret holes on the spinneret and then react in an acid bath solution to obtain the regenerated cellulose fiber.

8. The preparation method according to claim 7, characterized in that: The regenerated cellulose spinning solution is obtained by dissolving the raw materials for preparing the regenerated cellulose fiber in a NaOH solution and then successively performing yellowing, filtration and degassing treatments; the ripeness of the regenerated cellulose spinning solution is 7.0 to 7.6 mL, and the viscosity is 40 to 45 s.

9. The preparation method according to claim 7, characterized in that: After reacting in the acid bath solution, it further includes: successively performing roller stretching, water washing, drying and winding.

10. The application of the regenerated cellulose fiber according to any one of claims 1 to 6 or the regenerated cellulose fiber prepared by the preparation method according to any one of claims 7 to 9 in a fabric.

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