An antistatic Lyocell fabric and its preparation method

Abstract

The present invention relates to an antistatic Lyocell fabric and a preparation method thereof. The fabric can be prepared by the following method: First, pulp cellulose is modified with aniline, sodium lignosulfonate, and ammonium persulfate; second, a spinning solution is prepared; third, the spinning solution is added to a screw extruder and enters a spinning system to obtain Lyocell fibers; finally, the Lyocell fibers are post-treated and woven to obtain the antistatic Lyocell fabric. The point-to-point resistance of the antistatic Lyocell fabric prepared by the present invention reaches 7.7×10 6 ~8.3×10 6 Ω, and the charged electric quantity reaches 0.18~0.23 μC / item; after 20 washes, the point-to-point resistance and the charged electric quantity do not change significantly, indicating that the Lyocell fabric prepared by the present invention has a stable antistatic function.

Description

Technical Field

[0001] The present invention belongs to the technical field of fabric preparation, and particularly relates to an antistatic Lyocell fabric and a preparation method thereof. Background Art

[0002] The main damages of static electricity lie in the excessive static voltage and the electric sparks generated during the static discharge process, which interfere with instruments and electronic devices, such as: the burning of electronic devices, the interference of the electromagnetic waves generated by static discharge with instruments, etc., as well as the fires and explosions caused by static sparks. The damage to the human body lies in the high temperature generated during the discharge process and the stimulation of the human body by the static current. Antistatic textiles can effectively reduce the hazards caused by static discharge and can reduce the risk of static electric shock to users.

[0003] Antistatic textiles mainly achieve the antistatic function through two means: static dissipation and static leakage. Static dissipation refers to the use of static dissipation materials to avoid the accumulation of static charges at a certain point or area, and to reduce the static electricity amount per unit area to avoid static discharge; static leakage mainly includes two methods: corona discharge and grounding. Among them, corona discharge refers to the method of transferring the generated static charges to the air through the weak discharge between the textile and the air; grounding is the method of timely transferring the static electricity generated on the clothing to the ground through the continuous conductive path on the surface and inside of the clothing. Generally speaking, in antistatic textiles, various means are used simultaneously. With the rapid development of industries such as the electronics industry, petrochemical industry, medical and health, the requirements for the production and working environment will be higher and higher, and the individual protection awareness will be gradually strengthened. Therefore, the development and application of high-quality, comfortable and cost-effective antistatic fibers, antistatic fabrics and corresponding antistatic clothing and other antistatic textiles have become the goals of the majority of textile researchers.

[0004] Lyocell fabric is a high-end fabric, but it does not have the antistatic function; if the conventional antistatic function modification idea is adopted, that is, improving its antistatic function from fabric modification, it will have a negative impact on the comfort of the fabric. Summary of the Invention

[0005] Aiming at the defects of the prior art, the first object of the present invention is to provide an antistatic Lyocell fabric, which has good antistatic function.

[0006] The antistatic Lyocell fabric described in the present invention can be prepared by the following method: First, modify the wood pulp cellulose with aniline, sodium lignosulfonate and ammonium persulfate; secondly, prepare the spinning solution; thirdly, add the spinning solution into the screw extruder and enter the spinning system to prepare Lyocell fibers; finally, the Lyocell fibers are post-treated and woven to prepare the antistatic Lyocell fabric.

[0007] The second object of the present invention is to provide a method for preparing an antistatic Lyocell fabric, comprising the following steps:

[0008] (1) Modification of wood pulp cellulose: Under ice bath conditions, mix wood pulp cellulose, aniline and an aqueous solution of sodium lignosulfonate, stir for 30 - 40 minutes until the wood pulp cellulose is completely dispersed, adjust the reaction temperature to 70 - 80 °C, then dropwise add an aqueous solution of ammonium persulfate to start the reaction, and react for 100 - 120 minutes under mechanical stirring conditions; after the reaction is completed, filter, wash with tap water until the obtained filtrate is neutral, then collect the modified wood pulp cellulose, dry it for use.

[0009] Preferably, the dosage ratio of the wood pulp cellulose, aniline, aqueous solution of sodium lignosulfonate and aqueous solution of ammonium persulfate is 1 g∶(0.1 - 0.3) mL∶(10 - 20) mL∶(10 - 20) mL; the concentration of the aqueous solution of sodium lignosulfonate is 0.1 - 0.3 wt%; the concentration of the aqueous solution of ammonium persulfate is 0.5 - 0.7 wt%.

[0010] (2) Preparation of spinning solution: Distill an aqueous solution of N - methylmorpholine - N - oxide (NMMO) with a concentration of 50 - 55 wt% under reduced pressure to an aqueous solution of NMMO with a concentration of 90 - 95 wt%, dissolve the modified wood pulp cellulose prepared in step (1) in the aqueous solution of NMMO, and stir and dissolve in a reaction kettle at 105 - 120 °C for 30 - 40 minutes to obtain a spinning solution with a concentration of 12 - 18 wt%.

[0011] (3) Spinning: Add the spinning solution prepared in step (2) to a screw extruder, further dissolve it at 95 - 110 °C, then filter and enter the spinning system to obtain Lyocell fibers.

[0012] Preferably, the air gap length of the spinning system is 6 - 9 cm, the spinning speed is 35 - 50 m / min, the pore diameter of the spinneret is 10 - 110 μm, and the capillary length of the hole is 300 - 900 μm; the ejected silk thread is vertically stretched in the air and enters the coagulation bath, where it coagulates and forms. The concentration of the coagulation bath is an aqueous solution of NMMO with a concentration of 12 - 15 wt%, and the temperature of the coagulation bath is 6 - 9 °C.

[0013] (4) Post - treatment: After subjecting the Lyocell fibers prepared in step (3) to alcohol washing, water washing, oiling and drying processes, Lyocell fibers are obtained.

[0014] (5) Weaving: Spin the Lyocell fibers prepared in step (4) into yarns, and then weave the yarns into an antistatic Lyocell fabric.

[0015] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0016] (1) The main raw material of the Lyocell fabric is wood pulp cellulose, which does not have electrical conductivity. In order to endow the Lyocell fabric with electrical conductivity and antistatic function, the present invention grafts polyaniline onto the wood pulp cellulose and uses sodium lignosulfonate as a dopant, and the obtained Lyocell fabric has a good antistatic function.

[0017] (2) The present invention starts from the modification of the raw materials of the Lyocell fabric, and the obtained Lyocell fabric has a stable antistatic function; after multiple washes, the antistatic function does not weaken.

[0018] (3) According to the test method of GB 12014—2009, the point-to-point resistance of the antistatic Lyocell fabric prepared by the present invention reaches 7.7×10 6 ~8.3×10 6 Ω, and the charged electric quantity reaches 0.18~0.23 μC / piece, meeting the technical standards of Class A or Class B; after 20 washes, the point-to-point resistance and the charged electric quantity do not change significantly, indicating that the Lyocell fabric prepared by the present invention has a stable antistatic function. Detailed implementation mode

[0019] Example 1

[0020] An antistatic Lyocell fabric is prepared by the following method:

[0021] (1) Modification of wood pulp cellulose: Under ice bath conditions, 10 g of wood pulp cellulose, 2 mL of aniline and 150 mL of 0.2 wt% sodium lignosulfonate aqueous solution are mixed, stirred for 35 minutes until the wood pulp cellulose is completely dispersed, the reaction temperature is adjusted to 75 °C, and then 150 mL of 0.6 wt% ammonium persulfate aqueous solution is dropped in to start the reaction, and the reaction is carried out for 110 minutes under mechanical stirring conditions; after the reaction is completed, it is filtered, washed with tap water until the obtained filtrate is neutral, and then the modified wood pulp cellulose is collected and dried for use.

[0022] (2) Preparation of spinning solution: The 53 wt% aqueous solution of N-methylmorpholine-N-oxide (NMMO) is distilled under reduced pressure to a 93 wt% aqueous solution of NMMO, and the modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, and stirred and dissolved in a reaction kettle at 115 °C for 35 minutes to obtain a 16 wt% spinning solution.

[0023] (3) Spinning: The spinning solution prepared in step (2) is added to a screw extruder, further dissolved at 105 °C, then filtered, and enters the spinning system to obtain Lyocell fibers.

[0024] The air gap length of the spinning system is 7 cm, the spinning speed is 40 m / min, the orifice diameter of the spinneret is 60 μm, and the capillary length of the orifice is 600 μm; the ejected silk thread is vertically stretched in the air and enters the coagulation bath for solidification and shaping. The concentration of the coagulation bath is 13 wt% aqueous solution of NMMO, and the temperature of the coagulation bath is 7 °C.

[0025] (4) Post-treatment: The Lyocell fiber obtained in step (3) is subjected to alcohol washing, water washing, oiling and drying processes to obtain Lyocell fiber.

[0026] (5) Weaving: The Lyocell fiber obtained in step (4) is spun into yarn, and then the yarn is woven into the antistatic Lyocell fabric a.

[0027] Example 2

[0028] An antistatic Lyocell fabric is prepared by the following method:

[0029] (1) Modification of wood pulp cellulose: Under ice bath conditions, 10 g of wood pulp cellulose, 1 mL of aniline and 100 mL of 0.1 wt% aqueous solution of lignosulfonate are mixed and stirred for 30 minutes until the wood pulp cellulose is completely dispersed. The reaction temperature is adjusted to 70 °C, and then 100 mL of 0.5 wt% aqueous solution of ammonium persulfate is added dropwise to start the reaction, and the reaction is carried out for 100 minutes under mechanical stirring conditions; after the reaction is completed, filtration is carried out, and washing is carried out with tap water until the obtained filtrate is neutral, and then the modified wood pulp cellulose is collected and dried for use.

[0030] (2) Preparation of spinning solution: The 50 wt% aqueous solution of N-methylmorpholine-N-oxide (NMMO) is distilled under reduced pressure to a 90 wt% aqueous solution of NMMO. The modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution and stirred and dissolved in a reaction kettle at 105 °C for 30 minutes to obtain a 12 wt% spinning solution.

[0031] (3) Spinning: The spinning solution obtained in step (2) is added to a screw extruder, further dissolved at 95 °C, then filtered, and enters the spinning system to obtain Lyocell fiber.

[0032] The air gap length of the spinning system is 6 cm, the spinning speed is 35 m / min, the orifice diameter of the spinneret is 10 μm, and the capillary length of the orifice is 300 μm; the ejected silk thread is vertically stretched in the air and enters the coagulation bath for solidification and shaping. The concentration of the coagulation bath is 12 wt% aqueous solution of NMMO, and the temperature of the coagulation bath is 6 °C.

[0033] (4) Post-treatment: The Lyocell fiber obtained in step (3) is subjected to alcohol washing, water washing, oiling and drying processes to obtain Lyocell fiber.

[0034] (5) Weaving: The Lyocell fibers obtained in step (4) are spun into yarns, and then the yarns are woven into the anti-static Lyocell fabric b.

[0035] Example 3

[0036] An anti-static Lyocell fabric is prepared by the following method:

[0037] (1) Modification of wood pulp cellulose: Under ice bath conditions, 10 g of wood pulp cellulose, 3 mL of aniline, and 200 mL of a 0.3 wt% sodium lignosulfonate aqueous solution are mixed, and stirred for 40 minutes until the wood pulp cellulose is completely dispersed. The reaction temperature is adjusted to 80 °C, and then 200 mL of a 0.7 wt% ammonium persulfate aqueous solution is added dropwise to start the reaction. The reaction is carried out for 120 minutes under mechanical stirring conditions; after the reaction is completed, filtration is carried out, and it is washed with tap water until the obtained filtrate is neutral, and then the modified wood pulp cellulose is collected and dried for use.

[0038] (2) Preparation of spinning solution: The 55 wt% N-methylmorpholine-N-oxide (NMMO) aqueous solution is distilled under reduced pressure to a 95 wt% NMMO aqueous solution. The modified wood pulp cellulose prepared in step (1) is dissolved in the NMMO aqueous solution, and stirred and dissolved in a reaction kettle at 120 °C for 40 minutes to obtain an 18 wt% spinning solution.

[0039] (3) Spinning: The spinning solution prepared in step (2) is added to a screw extruder, further dissolved at 110 °C, then filtered, and enters the spinning system to obtain Lyocell fibers.

[0040] The air gap length of the spinning system is 9 cm, the spinning speed is 50 m / min, the orifice diameter of the spinneret is 110 μm, and the capillary length of the orifice is 900 μm; the ejected filaments are vertically stretched in the air and enter the coagulation bath tank for coagulation and forming. The concentration of the coagulation bath is a 15 wt% NMMO aqueous solution, and the temperature of the coagulation bath is 9 °C.

[0041] (4) Post-treatment: The Lyocell fibers obtained in step (3) are subjected to alcohol washing, water washing, oiling, and drying processes to obtain Lyocell fibers.

[0042] (5) Weaving: The Lyocell fibers obtained in step (4) are spun into yarns, and then the yarns are woven into the anti-static Lyocell fabric c.

[0043] Comparative Example A

[0044] Taking Example 1 as a comparison, in this Comparative Example A, the dopant is changed, that is, "sodium lignosulfonate" in step (1) is replaced by "sodium dodecyl sulfonate", and other preparation methods are implemented according to the preparation method of Example 1 to obtain the anti-static Lyocell fabric d.

[0045] Comparative Example B

[0046] Taking Example 1 as a comparison, in this Comparative Example B, the reaction temperature was lowered, that is, “adjusting the reaction temperature to 75 °C” in step (1) was adjusted to “adjusting the reaction temperature to 35 °C”, and other preparation methods were carried out according to the preparation method of Example 1 to obtain the antistatic Lyocell fabric e.

[0047] Comparative Example C

[0048] Taking Example 1 as a comparison, in this Comparative Example C, the initiator concentration was lowered, that is, “0.6 wt% ammonium persulfate aqueous solution” in step (1) was adjusted to “0.06 wt% ammonium persulfate aqueous solution”, and other preparation methods were carried out according to the preparation method of Example 1 to obtain the antistatic Lyocell fabric f.

[0049] Performance evaluation test:

[0050] Select the antistatic Lyocell fabrics a, b, c, d, e, and f prepared in the above specific Examples 1 to 3 and Comparative Examples A to C of the present invention. The antistatic function test refers to GB 12014—2009 "Antistatic Clothing", and the point-to-point resistance and charged charge amount are used as antistatic function evaluation indicators. Among them, the point-to-point resistance refers to Appendix A of GB 12014—2009, and the charged charge amount refers to the test method in Appendix B of GB 12014—2009. The test conditions are: temperature: (20 ± 5) °C, relative humidity: (35 ± 5)%. The test results are shown in Table 1.

[0051] Table 1

[0052]

[0053]

[0054] As can be seen from Table 1, by comparing the point-to-point resistance and charged charge amount of the antistatic Lyocell fabrics a, b, c, d, e, and f prepared in Examples 1 to 3 and Comparative Examples A to C, it can be seen that Examples 1 to 3 are significantly superior to Comparative Examples A to C in terms of antistatic indicators. The performance evaluation test results show that the type of dopant, reaction temperature, and initiator concentration all have important effects on the antistatic function of the Lyocell fabric.

Claims

1. A preparation method of an antistatic Lyocell fabric, characterized in that, The preparation method comprises the following steps: (1) Modification of wood pulp cellulose: Under ice bath conditions, mix wood pulp cellulose, aniline, and an aqueous solution of sodium lignosulfonate, stir for 30 - 40 minutes until the wood pulp cellulose is completely dispersed, adjust the reaction temperature to 70 - 80 °C, then dropwise add an aqueous solution of ammonium persulfate to start the reaction, and react for 100 - 120 minutes under mechanical stirring conditions; after the reaction is completed, filter, wash with tap water until the obtained filtrate is neutral, then collect the modified wood pulp cellulose, dry it for later use; the modified wood pulp cellulose is wood pulp cellulose grafted with polyaniline; (2) Preparation of the spinning solution: Distill an aqueous solution of N - methyl morpholine - N - oxide (NMMO) with a mass fraction of 50 - 55 wt% under reduced pressure to an aqueous solution of NMMO with a mass fraction of 90 - 95 wt%, dissolve the modified wood pulp cellulose prepared in step (1) in the aqueous solution of NMMO, and stir and dissolve in a reaction kettle at 105 - 120 °C for 30 - 40 minutes to obtain a spinning solution with a mass fraction of 12 - 18 wt%; (3) Spinning: Add the spinning solution prepared in step (2) to a screw extruder, further dissolve it at 95 - 110 °C, then filter, and enter the spinning system to obtain Lyocell fibers; (4) Post - treatment: After subjecting the Lyocell fibers prepared in step (3) to alcohol washing, water washing, oiling, and drying processes, obtain Lyocell fibers; (5) Weaving: Spin the Lyocell fibers prepared in step (4) into yarns, and then weave the yarns into an antistatic Lyocell fabric.

2. The preparation method of an antistatic lyocell fabric according to claim 1, characterized in that, In step (1), the dosage ratio of the wood pulp cellulose, aniline, aqueous solution of sodium lignosulfonate, and aqueous solution of ammonium persulfate is 1 g∶(0.1 - 0.3) mL∶(10 - 20) mL∶(10 - 20) mL; the concentration of the aqueous solution of sodium lignosulfonate is 0.1 - 0.3 wt%; the concentration of the aqueous solution of ammonium persulfate is 0.5 - 0.7 wt%.

3. The preparation method of an anti-static Lyocell fabric according to claim 1, characterized in that, In step (3), the air gap length of the spinning system is 6 - 9 cm, the spinning speed is 35 - 50 m / min, the pore diameter of the spinneret is 10 - 110 μm, and the capillary length of the pore is 300 - 900 μm; the ejected filaments are vertically stretched in the air and enter the coagulation bath, where they coagulate and form, and the concentration of the coagulation bath is an aqueous solution of NMMO with a mass fraction of 12 - 15 wt%, and the temperature of the coagulation bath is 6 - 9 °C.

4. An antistatic Lyocell fabric, characterized in that, Prepared by the method described in any one of claims 1 - 3.

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