Novel viscose fiber spinning method

Abstract

The invention relates to a novel viscose fiber spinning method, and relates to the technical field of viscose fibers. The non-acidic coagulating bath is mainly composed of at least one of sodium salts. The viscose stock solution does not release hydrogen sulfide and carbon disulfide during non-acid coagulating bath spinning forming, spinning station workers and the atmospheric environment are friendly, sodium bicarbonate consumed by fiber forming can be prepared by reacting carbon dioxide with sodium carbonate, the production cost of chemical raw materials is low, the byproduct sodium carbonate generated in a coagulating bath is higher in economic value, and the production cost is low. And the fibers are uniformly formed, the orientation degree is higher, and the dimensional stability is better.

Description

Technical Field

[0001] The invention relates to the technical field of viscose fibers, and in particular to a novel viscose fiber spinning method. Background Art

[0002] Viscose fiber is a regenerated cellulose fiber, which is produced from cotton or other natural fibers. Its moisture content meets the physiological requirements of human skin and has the characteristics of being smooth, cool, breathable, anti-static, and colorfully dyed.

[0003] At present, domestic and foreign viscose fiber manufacturers all use acid-base neutralization to spin viscose fibers. This spinning process has the problems of high fiber preparation cost, high release of hydrogen sulfide and carbon disulfide during spinning, and low economic value of by-product sodium sulfate. In view of this, the present invention provides a novel viscose fiber spinning method. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a novel viscose fiber spinning method, which aims to effectively avoid the release of hydrogen sulfide and carbon disulfide during spinning, and the by-products have higher economic value; and the obtained fibers have uniform molding, higher orientation and better dimensional stability.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] In a first aspect, a non-acidic coagulation bath for preparing viscose fibers is provided, wherein the non-acidic coagulation bath is mainly composed of at least one of sodium salts.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the sodium salt includes at least one of sodium bicarbonate, sodium carbonate and sodium sulfate.

[0009] Furthermore, the non-acidic coagulation bath is mainly composed of sodium bicarbonate, sodium carbonate and sodium sulfate; the mass content of sodium bicarbonate in the non-acidic coagulation bath is 1%-10%, the mass content of sodium carbonate in the non-acidic coagulation bath is 0.1%-10%, and the mass content of sodium sulfate in the non-acidic coagulation bath is 10%-30%.

[0010] Furthermore, the mass content of sodium bicarbonate in the non-acidic coagulation bath is 4%-8%, the mass content of sodium carbonate in the non-acidic coagulation bath is 1%-5%, and the mass content of sodium sulfate in the non-acidic coagulation bath is 10%-18%.

[0011] In a second aspect, a method for preparing a novel viscose fiber comprises the following steps: wet spinning a viscose stock solution in the non-acidic coagulation bath to obtain a formed fiber; and sequentially acid-washing and refining the formed fiber to obtain a novel viscose fiber.

[0012] Furthermore, sodium bicarbonate, sodium carbonate and sodium sulfate are dissolved in soft water in sequence to obtain a non-acidic coagulation bath.

[0013] The viscose stock solution is prepared by the following method: the preparation process of the viscose stock solution can be found in the textbook of higher textile colleges, "Cellulose and Viscose Fiber", edited by Yang Zhili, Jiang Tingpei, Wang Qingrui, Wu Guoming, etc., Chapter 8 of the middle volume on the principles of viscose preparation technology, and the data indicators of the composition of the viscose stock solution can be found in the first paragraph on page 96 of this textbook.

[0014] Furthermore, the volume ratio of the viscose stock solution to the non-acidic coagulation bath is 1:25-1:20.

[0015] Furthermore, the parameters of wet spinning are: temperature of 20°C-60°C, and spinning speed of 19m / min-22m / min.

[0016] The third aspect provides a novel viscose fiber, wherein the novel viscose fiber is prepared by the preparation method.

[0017] Furthermore, the novel viscose fiber has uniform crystallization without a core-skin structure, the fiber elongation is reduced by more than 10%, and the cross section is smooth, round and wrinkle-free.

[0018] The beneficial effects of the present invention are:

[0019] (1) The viscose stock solution of the present invention does not release hydrogen sulfide or carbon disulfide during spinning in a non-acidic coagulation bath, which is friendly to spinning workers and the atmospheric environment. The sodium bicarbonate consumed in fiber forming can be prepared by reacting carbon dioxide with sodium carbonate, and the production cost of chemical raw materials is low. The by-product sodium carbonate generated in the coagulation bath has a higher economic value, and the fiber forming is uniform, with a higher degree of orientation and better dimensional stability.

[0020] (2) The viscose fiber of the present invention can be used to produce both facial mask products with high transparency and clothing fabric products with high dimensional stability, which is beneficial to the sustainable and healthy development of the viscose fiber industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a microscopic image of the cross section of the viscose fiber of the present invention. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below, and the examples are only used to explain the present invention and are not used to limit the scope of the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0023] Embodiment 1:

[0024] The present embodiment relates to a method for preparing a novel viscose fiber, comprising the following steps: wet spinning a viscose stock solution in the non-acidic coagulation bath to obtain a formed fiber; and sequentially acid-washing and refining the formed fiber to obtain a novel viscose fiber.

[0025] Specifically, the viscose stock solution is prepared by the following method: the viscose stock solution preparation process can refer to the textbook of higher textile colleges, "Cellulose and Viscose Fiber" edited by Yang Zhili, Jiang Tingpei, Wang Qingrui, Wu Guoming, etc., the eighth chapter of the middle volume on the principle of viscose preparation process, and the viscose stock solution composition data index can refer to the first paragraph on page 96 of this textbook;

[0026] The non-acidic coagulation bath is prepared by the following method: firstly, a certain proportion of sodium bicarbonate is dissolved in a 50-degree Celsius soft water hot water bath, and after stirring to fully dissolve, sodium carbonate is dissolved in the soft water hot water bath at a mass ratio of 1%-5%, and after stirring to fully dissolve, sodium sulfate is dissolved in the soft water hot water bath at a mass ratio of 10%-18%, and stirred evenly for spinning.

[0027] In this embodiment, the coagulation bath composition is: 18% Na 2 SO 4 , 4% NaHCO 3 、1%Na 2 CO 3 , the temperature is 49°C;

[0028] The volume ratio of the viscose stock solution to the non-acidic coagulation bath is 1:22.

[0029] Specifically, the parameters of wet spinning in this embodiment are: oil bath concentration of 8 g / L, temperature of 55° C.; spinning speed of 19 m / min; rotation speed of the first drafting roller of 11 m / min, and rotation speed of the second drafting roller of 19 m / min.

[0030] The acid washing in this embodiment specifically includes washing in an acid solution of 10-20 g / L to obtain pure cellulose fibers, and the washing temperature is 60°C-90°C.

[0031] Embodiment 2:

[0032] Compared with Example 1, except for the following differences: the coagulation bath composition is: 18% Na 2 SO 4 , 4% NaHCO 3 , 2%Na 2 CO 3 , temperature is 50°C; oil bath concentration is 8g / L, temperature is 55°C; spinning speed is 19m / min; first drafting roller speed is 13m / min, second drafting roller speed is 20m / min. The rest is the same as in Example 1.

[0033] Embodiment 3:

[0034] Compared with Example 1, except for the following differences: the coagulation bath composition is: 18% Na 2 SO 4 , 8% NaHCO 3 、1%Na 2 CO 3 , temperature is 49°C; oil bath concentration is 8g / L, temperature is 55°C; spinning speed is 22m / min; first drafting roller speed is 14m / min, second drafting roller speed is 21m / min. The rest is the same as in Example 1.

[0035] Embodiment 4:

[0036] Compared with Example 1, except for the following differences: conventional viscose stock solution is used for spinning, and the coagulation bath composition is: 10% Na 2 SO 4 , 10% NaHCO 3 , 5%Na 2 CO 3 , temperature is 49°C; oil bath concentration is 8g / L, temperature is 55°C; spinning speed is 22m / min; first drafting roller speed is 14m / min, second drafting roller speed is 21m / min. The rest is the same as in Example 1.

[0037] Comparative Example 1: Preparation of ordinary cellulose fibers

[0038] 15 kg of viscose stock solution for testing (compared with Example 1, the viscose stock solution contains 1200 g of cellulose xanthate and 300 g of NaOH) was filtered and degassed before wet spinning. After spinning, the fibers were subjected to the refining steps of washing, desulfurization, bleaching, and oiling. The composition of the wet spinning coagulation bath was: 1% ZnSO 4 , 29% Na 2 SO 4 , 9% H 2 SO 4 , temperature is 50℃; oil bath concentration is 8.0g / L, temperature is 65℃; spinning speed is 38m / min.

[0039] Comparative Example 2: Preparation of ordinary cellulose fibers

[0040] 15 kg of the experimental viscose stock solution (compared with Example 1, the viscose stock solution contains 1200 g of cellulose xanthate and 300 g of NaOH) was filtered and degassed, and then wet-spun. After spinning, the fibers were subjected to the refining steps of washing, desulfurization, bleaching, and oiling. The composition of the wet spinning coagulation bath was: 1% ZnSO 4 、29%Na 2 SO 4 , 12% H 2 SO 4 , temperature is 49℃; oil bath concentration is 8.0g / L, temperature is 60℃; spinning speed is 42m / min.

[0041] Test example

[0042] The cellulose fibers prepared in the embodiments and comparative examples were tested for related properties. The test results are shown in Table 1.

[0043] (1) Dry breaking strength: Test standard is in accordance with GB / T14463-2008;

[0044] (2) Dry elongation at break: test standard is in accordance with GB / T14463-2008;

[0045] (3) Wet breaking strength: Test standard is in accordance with GB / T14463-2008 。

[0046] Table 1

[0047]

[0048] As can be seen from Table 1, the dry breaking strength, wet breaking strength and dry breaking elongation of the viscose fiber prepared by the non-acidic spinning bath of the present invention are improved compared with the cellulose fiber prepared by the conventional method, indicating that the mechanical properties of the viscose fiber prepared by the non-acidic spinning bath are slightly better than those of the conventional viscose fiber and can meet the spinning requirements.

[0049] In summary, the viscose stock solution prepared by the present invention does not release hydrogen sulfide and carbon disulfide during spinning in a non-acidic coagulation bath, is friendly to spinning workers and the atmospheric environment, and the sodium bicarbonate consumed in fiber forming can be prepared by reacting carbon dioxide with sodium carbonate, the production cost of chemical raw materials is low, the by-product sodium carbonate generated in the coagulation bath has a higher economic value, and the fiber forming is uniform, the orientation degree is higher, and the dimensional stability is better.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A non-acidic coagulation bath for viscose fiber preparation, characterized in that: The non-acidic coagulation bath is mainly composed of at least one of the sodium salts.

2. A non-acidic coagulation bath for viscose fiber preparation according to claim 1, characterized in that: The sodium salt includes at least one of sodium bicarbonate, sodium carbonate and sodium sulfate.

3. A non-acidic coagulation bath for viscose fiber preparation according to claim 1, characterized in that: The non-acidic coagulation bath mainly consists of sodium bicarbonate, sodium carbonate and sodium sulfate; the mass content of sodium bicarbonate in the non-acidic coagulation bath is 1%-10%, the mass content of sodium carbonate in the non-acidic coagulation bath is 0.1%-10%, and the mass content of sodium sulfate in the non-acidic coagulation bath is 10%-30%.

4. A non-acidic coagulation bath for viscose fiber preparation according to claim 1, characterized in that: The mass content of sodium bicarbonate in the non-acidic coagulation bath is 4%-8%, the mass content of sodium carbonate in the non-acidic coagulation bath is 1%-5%, and the mass content of sodium sulfate in the non-acidic coagulation bath is 10%-18%.

5. A method for preparing a novel viscose fiber, characterized in that: The method comprises the following steps: wet spinning a viscose stock solution in the non-acidic coagulation bath as claimed in any one of claims 1 to 4 to obtain a formed fiber; and sequentially acid washing and refining the formed fiber to obtain a novel viscose fiber.

6. The method for preparing a novel viscose fiber according to claim 5, characterized in that: The non-acidic coagulation bath is prepared by the following method: sodium bicarbonate, sodium carbonate and sodium sulfate are dissolved in soft water in sequence to obtain the non-acidic coagulation bath.

7. The method for preparing a novel viscose fiber according to claim 5, characterized in that: The volume ratio of the viscose stock solution to the non-acidic coagulation bath is 1:25-1:

20.

8. The method for preparing a novel viscose fiber according to claim 5, characterized in that: The parameters of wet spinning are: temperature of 20°C-60°C and spinning speed of 19m / min-22m / min.

9. A novel viscose fiber, characterized in that: The novel viscose fiber is prepared by the preparation method according to any one of claims 5 to 8.

10. The novel viscose fiber according to claim 9, characterized in that: The novel viscose fiber has uniform crystallization and no skin-core structure, the fiber elongation is reduced by more than 10%, and the cross section is smooth, round and wrinkle-free.

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