A kind of protein-containing lyocell fiber and preparation method thereof

Abstract

The invention discloses a protein-containing lyocell fiber and a preparation method thereof, and relates to the technical field of fiber preparation. The method comprises the following steps: preparing a protein solution with a protein content of 10-40%, wherein the particle size of the protein solution is less than 30 μm; preparing a lyocell-type hydroxymethyl cellulose solution, wherein the lyocell-type hydroxymethyl cellulose contains 1%-5% hydroxymethyl cellulose, 85-92% methylcellulose and a degree of polymerization of 500-580; statically mixing the protein solution with the hydroxymethyl cellulose solution at a ratio of 1:10-25, stirring evenly to obtain a blended spinning solution; spinning the blended spinning solution by a dry-jet wet spinning process, extruding the spinning solution through a spinneret, and first passing through an air bath after the spinning solution is extruded from the spinneret, and obtaining a spinning strip under the action of cooling wind; the spinning strip is double-diffused with the coagulation solution in a coagulation bath to form fibers to obtain a fiber bundle; cutting the obtained fiber bundle, washing once until the residual amount of the spinning solvent is less than 1.5%, washing twice, oiling, dehydrating and drying to obtain a finished product of the protein-containing lyocell fiber.

Description

Technical Field

[0001] The invention relates to the technical field of fiber preparation, in particular to a protein-containing lyocell fiber and a preparation method thereof. Background Art

[0002] Protein is an indispensable component of the human body. It is mainly divided into animal protein and plant protein in nature, and has a wide range of sources. As people's pursuit of functional products becomes increasingly strong, it is imperative to prepare new and multifunctional protein fibers. Regenerated cellulose fiber is a degradable material made from natural cellulose (cotton, linen, bamboo, trees, shrubs, etc.). The active hydroxyl groups of cellulose molecules are grafted and copolymerized with other molecules in different production links without changing its chemical structure, but only changing the physical structure of natural cellulose, thereby producing regenerated cellulose fibers with better performance. It is a new application to prepare new fibers by adding protein and mixing it with lyocell spinning solution for textiles. The obtained protein fiber has the smoothness of silk, which not only expands the application field of protein, but also adds more choices for textile raw materials, bringing more products to consumers. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a protein-containing lyocell fiber and a preparation method thereof, wherein a specific protein solution is selected and blended with a lyocell-type hydroxymethyl cellulose solution to obtain a blended spinning solution, the blended spinning solution is spun by a dry-jet wet spinning process, and the spinning strands are double-diffused with the coagulation liquid in a coagulation bath to obtain a fiber bundle; after at least three water washings, two water washings, oiling, dehydration and drying, a finished protein-containing lyocell fiber is obtained.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for preparing protein-containing lyocell fiber, characterized in that it comprises the following steps:

[0006] Step 1, preparing a protein solution with a protein content of 10-40%, wherein the particle size of the protein solution is less than 30 μm;

[0007] Step 2, preparing a lyocell-based hydroxymethyl cellulose solution, wherein the lyocell-based hydroxymethyl cellulose solution contains 1%-5% hydroxymethyl cellulose, 85-92% methylcellulose, and a degree of polymerization of 500-580;

[0008] Step 3, the ratio of the protein solution to the hydroxymethyl cellulose solution is 1:10-25, statically mixing and stirring evenly to obtain a blended spinning solution;

[0009] Step 4: The blended spinning solution is spun by dry-jet wet spinning process and extruded through a spinneret. After the spinning solution is extruded from the spinneret, it first passes through an air bath and, under the action of cooling air, a spinning strip is obtained;

[0010] Step 5, the spinning strips are double diffused with the coagulation liquid in the coagulation bath to form fibers to obtain fiber bundles;

[0011] Step 6: Cut the obtained fiber bundle, wash it once until the residual amount of spinning solvent is less than 1.5%, wash it twice, oil it, dehydrate it and dry it to obtain the finished product of protein-containing lyocell fiber.

[0012] Preferably, in step 1, the protein solution is prepared by waste protein materials or protein extracts. The waste protein materials include any one of wool scraps, pig hair, human hair, chicken feathers, feathers, silk scraps and silkworm pupae; the protein extract includes any one of rice protein, soy protein, corn protein, peanut protein, casein and collagen.

[0013] Preferably, the waste protein material is continuously washed with a sodium hydroxide solution with a mass fraction of 0.005-0.015% at room temperature until it is neutral and the washing water is clear. The washed waste protein material is put into a mesh bag, put into an oven, dried at 60-82°C for 2-4h, and then chopped. The chopped waste protein material is weighed, and a sodium hydroxide solution with a concentration of 2-3.5% is added. According to the ratio of waste protein: sodium hydroxide solution of 1:10-1:15, it is dissolved at 75-90°C for 2h-4h until it is completely dissolved, and the mixture is kept warm for 4h-6h, taken out, and cooled; the first filtration is carried out through a plate and frame filter, and the second filtration is carried out through a centrifuge, the supernatant is taken, and the supernatant is continuously stirred for 0.5-3h with a magnetic stirrer at a speed of 300-800 rpm, and allowed to stand for 2h.

[0014] Preferably, the protein extract powder is dissolved in a sodium hydroxide solution with a mass fraction of 0.5-4% or in fresh cow's milk or goat's milk to prepare a protein content of 10%-40%. The protein solution is filtered using a centrifuge at a speed of 1500-6000 rpm for 2-10 minutes. The supernatant is taken and stirred continuously for 0.2-2h with a magnetic stirrer at a speed of 300-600 rpm, and stirred continuously for 0.5-3h with a magnetic stirrer at a speed of 300-800 rpm, and allowed to stand for 2h.

[0015] Preferably, in step 1, a honeysuckle solution with a protein solution content of 0.5-3% by mass is added. The honeysuckle solution is prepared by placing honeysuckle powder in deionized water with a dissolution temperature of 60-95° C. in an ultrasonic oscillator and fully dissolving the solution to obtain a honeysuckle solution with a mass fraction of honeysuckle extract of 1-50%.

[0016] Preferably, in the step 2, the cellulose pulp is cut into small pieces of pulp less than 500 μm by a pulp cutter, and the pieces are put into a mixing kettle through a conveyor belt after being weighed, and the NMMO / H2O solution is injected into the mixing kettle, and the mixed materials are sent to a pre-dissolving kettle through a screw pump, and the materials are continuously rolled and squeezed to make the solvent and cellulose be fully mixed to obtain pulp porridge; the pulp porridge is sent to a dissolver through a screw pump, and a thin film evaporator is used to form a spinning solution; the concentration of the NMMO / H2O solution is 75-85%, the cellulose pulp is 10-15% of the NMMO / H2O solution, and the particle size of the spinning solution is less than 50 μm.

[0017] Preferably, the cellulose pulp is one or more of cotton pulp, bamboo pulp or wood pulp, and the cellulose content is ≥90%.

[0018] Preferably, the vacuum degree of the pre-dissolution kettle is 0.09-0.01 MPa, the operating temperature is 60-80°C, and the vacuum degree of the thin film evaporator is 0.05-0.1 MPa, and the operating temperature is 90-110°C.

[0019] Preferably, in step 5, the coagulation bath concentration is 15-30% NMMO, and the coagulation bath temperature is 20-40°C.

[0020] A protein-containing lyocell fiber, wherein the breaking strength of the protein-containing lyocell fiber is ≥3.60 cN / dtex, the wet breaking strength is ≥3.10 cN / dtex, the wet modulus is ≥0.95 cN / dtex, and the protein content is ≥2.0%.

[0021] The beneficial effects of this technical solution are as follows:

[0022] 1. The present invention provides a method for preparing protein-containing lyocell fiber. The protein-containing lyocell fiber is light yellow in color and has a soft and delicate hand feel. The protein-containing lyocell fiber textile has good resilience and dimensional stability. It has no sense of oppression on the skin when worn and is skin-friendly and non-sticky. The protein-containing lyocell fiber is rich in polar groups such as amino groups and carboxyl groups, has a good effect of neutralizing acids and alkalis, can quickly remove sweat odor, and has more prominent effects after dyeing. The protein-containing lyocell fiber has excellent antibacterial properties, good warmth retention, can eliminate free radicals, and is skin-friendly and close to the skin.

[0023] 2. The present invention provides a method for preparing protein-containing lyocell fiber, and adding honeysuckle extract makes the antibacterial and anti-inflammatory functions of the protein-containing lyocell fiber more excellent and stable; the breaking strength of the finished protein-containing lyocell fiber is ≥3.60cN / dtex, the wet breaking strength is ≥3.10cN / dtex, the wet modulus is ≥0.95cN / dtex, and the protein content is ≥2.0%. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] The protein solution preparation method, the lyocell-type hydroxymethyl cellulose solution preparation method and the detection method in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4 and Comparative Example 5 are all implemented as follows:

[0027] The method for preparing protein liquid from waste protein materials comprises: the waste protein materials (the waste protein materials include any one of wool scraps, pig hair, human hair, chicken feathers, feathers, silk scraps and silkworm pupae) are continuously washed at room temperature with a sodium hydroxide solution with a mass fraction of 0.005-0.015% until neutral and the washing water is clear, the washed waste protein materials are put into a mesh bag, put into an oven, dried at 60-82°C for 2-4h and then shredded, the shredded waste protein materials are weighed, a sodium hydroxide solution with a concentration of 2-3.5% is added, and the waste protein materials are dissolved at 75-90°C for 2h-4h in a ratio of 1:10-1:15 of waste protein: sodium hydroxide solution until completely dissolved, and the mixture is kept warm for 4h-6h, taken out and cooled; the waste protein materials are filtered for the first time through a plate and frame filter, filtered for the second time through a centrifuge, the supernatant is taken, and the supernatant is stirred for 0.5-3h with a magnetic stirrer at a speed of 300-800 rpm and left to stand for 2h.

[0028] The method for preparing protein liquid from protein extract is as follows: the protein extract (protein extract includes any one of rice protein, soybean protein, corn protein, peanut protein, casein and collagen) powder is dissolved in a sodium hydroxide solution with a mass fraction of 0.5-4% or in fresh milk or goat milk to prepare a protein content of 10%-40%, the protein liquid is filtered by a centrifuge at a speed of 1500-6000 rpm, filtered for 2-10 minutes, the supernatant is taken, and stirred continuously for 0.2-2h with a magnetic stirrer at a speed of 300-600 rpm, stirred continuously for 0.5-3h with a magnetic stirrer at a speed of 300-800 rpm, and allowed to stand for 2h.

[0029] Preparation method of lyocell type hydroxymethyl cellulose solution: cellulose pulp (cellulose pulp is one or more of cotton pulp, bamboo pulp or wood pulp, cellulose content ≥ 90%, cellulose pulp is 10-15% of NMMO / H2O solution) is cut into small pieces of pulp less than 500 μm by a pulp cutter, weighed and put into a mixing kettle through a conveyor belt, NMMO / H2O solution (NMMO / H2O solution concentration is 75-85%) is injected into the mixing kettle, and mixed. The final material is sent into a pre-dissolving kettle (the vacuum degree of the pre-dissolving kettle is 0.09-0.01MPa, and the working temperature is 60-80℃) through a screw pump, and the material is continuously tumbled and squeezed to fully mix the solvent and cellulose to obtain a slurry; the slurry is sent into a dissolving machine through a screw pump, and a thin film evaporator (the vacuum degree of the thin film evaporator is 0.05-0.1MPa, and the working temperature is 90-110℃) is used to form a spinning solution (the particle size of the spinning solution is less than 50μm).

[0030] The breaking strength, wet breaking strength and wet modulus refer to the standard FZ / T 52019-2018. The protein content refers to the protein content test: reference standard FZ / T 50018-2013.

[0031] Example 1

[0032] A method for preparing protein-containing lyocell fiber comprises the following steps:

[0033] Step 1, preparing a protein solution with a protein content of 10%, wherein the particle size of the protein solution is 25 μm;

[0034] Step 2, preparing a lyocell-based hydroxymethyl cellulose solution, wherein the lyocell-based hydroxymethyl cellulose solution contains 1% hydroxymethyl cellulose, 85% methylcellulose, and a degree of polymerization of 500;

[0035] Step 3, the ratio of the protein solution to the hydroxymethyl cellulose solution is 1:10, statically mixing, stirring evenly, to obtain a blended spinning solution;

[0036] Step 4: The blended spinning solution is spun by dry-jet wet spinning process (the screw extruder temperature is 70°C, the hole capillary length is 400µm, the nozzle stretch ratio is 2.6, the air gap length is 150mm, and the spinning speed is 50m / min), and extruded through a spinneret (spinneret aperture is 20µm). After the spinning solution is extruded from the spinneret, it first passes through an air bath, and under the action of cooling wind, a spinning strip is obtained;

[0037] Step 5, the spinning strips are double diffused with the coagulation liquid in a coagulation bath (the coagulation bath uses a 12wt% NMMO aqueous solution, the coagulation bath length is 1.5m, and the temperature is 10°C) to form fibers to obtain fiber bundles;

[0038] Step 6: Cut the obtained fiber bundle, wash it with water at least once until the residual amount of spinning solvent is less than 1.5%, wash it with water twice, apply oil, dehydrate it and dry it, so as to obtain a finished product of protein-containing lyocell fiber. The finished product of protein-containing lyocell fiber has a breaking strength of 4.28 cN / dtex, a wet breaking strength of 3.29 cN / dtex, a wet modulus of 1.01 cN / dtex and a protein content of 3.23%.

[0039] Example 2

[0040] A method for preparing protein-containing lyocell fiber comprises the following steps:

[0041] Step 1, prepare a protein solution with a protein content of 25%, wherein the particle size of the protein solution is 30 μm, and add a honeysuckle solution with a weight percentage of 3% of the protein solution;

[0042] Step 2, preparing a lyocell-based hydroxymethyl cellulose solution, wherein the lyocell-based hydroxymethyl cellulose solution contains 3% hydroxymethyl cellulose, 88.5% methylcellulose, and a degree of polymerization of 540;

[0043] Step 3, the ratio of the protein solution to the hydroxymethyl cellulose solution is 1:17.5, statically mixing and stirring evenly to obtain a blended spinning solution;

[0044] Step 4: The blended spinning solution is spun by dry-jet wet spinning process (the screw extruder temperature is 70°C, the hole capillary length is 400µm, the nozzle stretch ratio is 2.6, the air gap length is 150mm, and the spinning speed is 50m / min), and extruded through a spinneret (spinneret aperture is 20µm). After the spinning solution is extruded from the spinneret, it first passes through an air bath, and under the action of cooling wind, a spinning strip is obtained;

[0045] Step 5, the spinning strips are double diffused with the coagulation liquid in a coagulation bath (the coagulation bath uses a 12wt% NMMO aqueous solution, the coagulation bath length is 1.5m, and the temperature is 10°C) to form fibers to obtain fiber bundles;

[0046] Step 6: Cut the obtained fiber bundle, wash it with water at least once until the residual amount of spinning solvent is less than 1.5%, wash it with water twice, apply oil, dehydrate it and dry it, so as to obtain a finished product of protein-containing lyocell fiber. The finished product of protein-containing lyocell fiber has a breaking strength of 4.03 cN / dtex, a wet breaking strength of 3.21 cN / dtex, a wet modulus of 0.98 cN / dtex and a protein content of 6.74%.

[0047] Example 3

[0048] A method for preparing protein-containing lyocell fiber comprises the following steps:

[0049] Step 1, prepare a protein solution with a protein content of 40%, wherein the particle size of the protein solution is 20 μm, and add a honeysuckle solution with a mass percentage of 0.5% of the protein solution;

[0050] Step 2, preparing a lyocell-based hydroxymethyl cellulose solution, wherein the lyocell-based hydroxymethyl cellulose solution contains 5% hydroxymethyl cellulose, 92% methylcellulose, and a degree of polymerization of 580;

[0051] Step 3, the ratio of the protein solution to the hydroxymethyl cellulose solution is 1:25, statically mixing, stirring evenly, to obtain a blended spinning solution;

[0052] Step 4: The blended spinning solution is spun by dry-jet wet spinning process (the screw extruder temperature is 70°C, the hole capillary length is 400µm, the nozzle stretch ratio is 2.6, the air gap length is 150mm, and the spinning speed is 50m / min), and extruded through a spinneret (spinneret aperture is 20µm). After the spinning solution is extruded from the spinneret, it first passes through an air bath, and under the action of cooling wind, a spinning strip is obtained;

[0053] Step 5, the spinning strips are double diffused with the coagulation liquid in a coagulation bath (the coagulation bath uses a 12wt% NMMO aqueous solution, the coagulation bath length is 1.5m, and the temperature is 10°C) to form fibers to obtain fiber bundles;

[0054] Step 6: Cut the obtained fiber bundle, wash it with water at least once until the residual amount of spinning solvent is less than 1.5%, wash it with water twice, apply oil, dehydrate it and dry it, so as to obtain a finished product of protein-containing lyocell fiber. The finished product of protein-containing lyocell fiber has a breaking strength of 3.76 cN / dtex, a wet breaking strength of 3.12 cN / dtex, a wet modulus of 0.96 cN / dtex and a protein content of 12.45%.

[0055] Comparative Example 1

[0056] The difference between this comparative example and Example 1 is that the particle size of the protein solution is 45 μm, and the prepared protein-containing lyocell fiber product has a breaking strength of 3.98 cN / dtex, a wet breaking strength of 3.08 cN / dtex, a wet modulus of 0.97 cN / dtex, and a protein content of 2.87%.

[0057] Comparative Example 2

[0058] The difference between this comparative example and Example 1 is that the protein content of the protein solution is 8%, and the prepared protein-containing lyocell fiber product has a breaking strength of 4.32 cN / dtex, a wet breaking strength of 3.34 cN / dtex, a wet modulus of 1.03 cN / dtex, and a protein content of 1.78%.

[0059] Comparative Example 3

[0060] The difference between this comparative example and Example 1 is that the protein content of the protein solution is 45%, and the prepared protein-containing lyocell fiber product has a breaking strength of 3.45 cN / dtex, a wet breaking strength of 3.06 cN / dtex, a wet modulus of 0.89 cN / dtex, and a protein content of 14.65%.

[0061] Comparative Example 4

[0062] The difference between this comparative example and Example 2 is that the lyocell-type hydroxymethyl cellulose solution contains 0.5% hydroxymethyl cellulose, 80% methylcellulose and a degree of polymerization of 480; the prepared protein-containing lyocell fiber has a breaking strength of 3.43 cN / dtex, a wet breaking strength of 2.98 cN / dtex, a wet modulus of 0.82 cN / dtex and a protein content of 4.86%.

[0063] The invention provides a method for preparing a protein-containing lyocell fiber. The protein-containing lyocell fiber is light yellow, soft and delicate to the touch, and the protein-containing lyocell fiber textile has good resilience and dimensional stability. When worn, it has no sense of pressure on the skin and is skin-friendly and non-sticky. The protein-containing lyocell fiber is rich in polar groups such as amino and carboxyl groups, has a good effect of neutralizing acid and alkali, can quickly remove sweat odor, and has more prominent efficacy after dyeing. The protein-containing lyocell fiber has excellent antibacterial performance, good warmth retention, has the effect of eliminating free radicals, and is skin-friendly and close to the skin. Adding honeysuckle extract makes the antibacterial and anti-inflammatory functions of the protein-containing lyocell fiber more excellent and stable. The finished product of the protein-containing lyocell fiber has a breaking strength of ≥3.60 cN / dtex, a wet breaking strength of ≥3.10 cN / dtex, a wet modulus of ≥0.95 cN / dtex, and a protein content of ≥2.0%.

[0064] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental labor, which all fall within the scope of protection of the present invention.

Claims

1. A method for preparing protein-containing lyocell fiber, characterized in that: The following steps are involved: Step 1, preparing a protein solution with a protein content of 10-40%, wherein the particle size of the protein solution is less than 30 μm; Step 2, preparing a lyocell-based hydroxymethyl cellulose solution, wherein the lyocell-based hydroxymethyl cellulose solution contains 1%-5% hydroxymethyl cellulose, 85-92% methylcellulose content, and a degree of polymerization of 500-580; The preparation method of lyocell type hydroxymethyl cellulose solution is as follows: cellulose pulp is cut into small pieces of pulp less than 500 μm by a pulp cutter, and the pieces are weighed and put into a mixing kettle by a conveyor belt, and a NMMO / H2O solution is injected into the mixing kettle, and the mixed materials are sent into a pre-dissolving kettle by a screw pump, and the materials are continuously rolled and squeezed to make the solvent and cellulose be fully mixed to obtain pulp porridge; the pulp porridge is sent into a dissolving machine by a screw pump, and a thin film evaporator is used to form a spinning solution, wherein the concentration of the NMMO / H2O solution is 75-85%, the cellulose pulp is 10-15% of the NMMO / H2O solution, and the particle size of the spinning solution is less than 50 μm; Step 3, the ratio of the protein solution to the hydroxymethyl cellulose solution is 1:10-25, statically mixing and stirring evenly to obtain a blended spinning solution; Step 4: The blended spinning solution is spun by dry-jet wet spinning process and extruded through a spinneret. After the spinning solution is extruded from the spinneret, it first passes through an air bath and, under the action of cooling air, a spinning strip is obtained; Step 5, the spinning strips are double diffused with the coagulation liquid in a coagulation bath to form fibers to obtain fiber bundles; the coagulation bath is a NMMO aqueous solution with a concentration of 15-30%, and the coagulation bath temperature is 20-40°C; Step 6: Cut the obtained fiber bundle, wash it once until the residual amount of spinning solvent is less than 1.5%, wash it twice, oil it, dehydrate it and dry it to obtain the finished product of protein-containing lyocell fiber.

2. The method for preparing a protein-containing lyocell fiber according to claim 1, characterized in that: In the step 1, the protein solution is obtained by preparing waste protein materials or protein extracts.

3. The method for preparing a protein-containing lyocell fiber according to claim 2, characterized in that: The protein solution preparation method comprises the following steps: continuously washing the waste protein material with a sodium hydroxide solution having a mass fraction of 0.005-0.015% at room temperature until the waste protein material is neutral and the washing water is clear, putting the washed waste protein material into a mesh bag, putting the washed waste protein material into an oven, drying the waste protein material at 60-82° C. for 2-4 hours, and then chopping the waste protein material into pieces; weighing the chopped waste protein material, adding a sodium hydroxide solution having a concentration of 2-3.5%, dissolving the waste protein material at a ratio of 1:10-1:15 to the sodium hydroxide solution at 75-90° C. for 2 hours to 4 hours until the waste protein material is completely dissolved, keeping the temperature for 4 hours to 6 hours, taking the waste protein material out, and cooling the waste protein material; The solution was filtered for the first time using a plate and frame filter and then filtered for the second time using a centrifuge. The supernatant was stirred continuously for 0.5-3 hours using a magnetic stirrer at a speed of 300-800 rpm and allowed to stand for 2 hours.

4. The method for preparing a protein-containing lyocell fiber according to claim 3, characterized in that: The protein solution preparation method comprises the following steps: dissolving protein extract powder in a sodium hydroxide solution with a mass fraction of 0.5-4% or in fresh cow's milk or goat's milk to prepare a protein solution with a protein content of 10%-40%, filtering the protein solution with a centrifuge at a rotation speed of 1500-6000 rpm for 2-10 minutes, taking the supernatant, stirring the solution with a magnetic stirrer for 0.2-2h at a rotation speed of 300-600 rpm, stirring the solution with a magnetic stirrer for 0.5-3h at a rotation speed of 300-800 rpm, and standing the solution for 2h.

5. The method for preparing a protein-containing lyocell fiber according to claim 4, characterized in that: In the step 1, 0.5-3% by weight of the protein solution is added to the honeysuckle solution.

6. The method for preparing a protein-containing lyocell fiber according to claim 5, characterized in that: The cellulose pulp is one or more of cotton pulp, bamboo pulp or wood pulp, and the cellulose content is ≥90%.

7. The method for preparing a protein-containing lyocell fiber according to claim 6, characterized in that: The vacuum degree of the pre-dissolution kettle is 0.09-0.01MPa, and the working temperature is 60-80°C; the vacuum degree of the thin film evaporator is 0.05-0.1MPa, and the working temperature is 90-110°C.

8. The protein-containing lyocell fiber prepared according to the method for preparing protein-containing lyocell fiber according to any one of claims 1 to 7, characterized in that: the protein-containing lyocell fiber has a breaking strength of ≥3.60 cN / dtex, a wet breaking strength of ≥3.10 cN / dtex, a wet modulus of ≥0.95 cN / dtex, and a protein content of ≥2.0%.