Phase-change emulsion for phase-change temperature-regulating cellulose fiber and preparation method of phase-change temperature-regulating cellulose fiber

Abstract

The invention discloses a phase-change emulsion for phase-change temperature-adjusting cellulose fibers and a preparation method of the phase-change temperature-adjusting cellulose fibers. The phase-change emulsion comprises the following components: 20-30 wt% of a phase-change material, 1-3 wt% of a nucleating agent with an antibacterial function, 1-3 wt% of protein colloid particles, 0.3-0.5 wt% of a surfactant and the balance of deionized water. Adding the phase change emulsion into a prepared cellulose solution by adopting a pre-spinning injection method to obtain a phase change spinning solution; the phase-change spinning solution is coagulated and formed through a spinning bath, then enters an air bath to be drafted, and then is cut off, desulfurized, pickled, washed, bleached, oiled and dried to prepare the phase-change temperature-adjusting cellulose fiber. The phase-change emulsion is low in supercooling degree, good in compatibility with a cellulose solution and used for preparing phase-change temperature-adjusting cellulose fibers, the spinnability is good during spinning, the production process is stable, and the fiber strength after spinning forming is high.

Description

Technical Field

[0001] The invention relates to the field of textile technology, in particular to a phase-change temperature-regulating cellulose fiber. Background Art

[0002] Phase change materials can absorb or release a large amount of latent heat during the phase change process. This advantage is widely used in the fields of heat storage and temperature control. Phase change thermostatic fibers were first developed by NASA for the moon landing program. They were initially used in space suits and to protect precision experimental instruments in space. The emergence of this textile has for the first time transformed the traditional passive defense and warmth-keeping method of mankind into an active heat-changing thermostatic method, and this process does not consume other energy. This technology has promoted the application of phase change thermostatic fibers in the fields of textiles and thermostatics. Thermostatic fibers have also been included as a type of smart textile and have been successfully introduced to the market. However, the phase change thermostatic fibers currently on the market generally have the problems of low enthalpy and high prices.

[0003] The prior art of phase-change thermostatic cellulose fiber generally prepares phase-change microcapsules from phase-change materials and adds them into spinning solution for blending and spinning to prepare cellulose fibers with thermostatic function. For example, Chinese patent CN202211711620.7 discloses a microcapsule phase-change thermostatic lyocell fiber and its preparation method, Chinese patent CN201210357126.5 discloses a cotton, wood, bamboo composite pulp phase-change microcapsule viscose fiber and its preparation method, and Chinese patent CN201710183743.0 discloses a high heat storage phase-change thermostatic viscose fiber and its preparation method. These patents all use the phase-change material of the capsule core coated with the capsule wall material as the functional additive of the fiber, and this method has many disadvantages. First, the preparation process of phase change microcapsules is complicated and the preparation cost is relatively high; second, the phase change microcapsules are added to the spinning solution. Because the phase change microcapsules are a granular substance, adding a large amount of them will cause problems such as poor fiber spinnability and low fiber strength; third, the substance that plays a phase change role in the phase change microcapsules is the capsule core, and the capsule wall will not produce any phase change. The capsule wall generally accounts for more than 20% of the phase change material. Therefore, in the prior art, the enthalpy value of fibers prepared with phase change microcapsules is generally low.

[0004] In addition, the phase change materials that can be used for cellulose fibers are generally alkanes, which are easy to buy on the market, low in price, and can be prepared into phase change emulsions. This emulsion is an oily substance, which has poor compatibility when directly added to the cellulose solution, is difficult to mix, and also has the problem of low supercooling.

[0005] Therefore, the phase change temperature regulating cellulose fiber in the prior art not only has the problem of low enthalpy value, but also has the problem of affected fiber strength and difficulty in spinning, which brings certain resistance to the current production and promotion of phase change temperature regulating fiber. Summary of the invention

[0006] The first technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a phase change emulsion with low supercooling, good compatibility with cellulose solution and used for phase change temperature regulation of cellulose fibers is provided.

[0007] The second technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a method for preparing phase change temperature-regulating cellulose fibers is provided, which adopts a phase change emulsion with low supercooling and good compatibility with the cellulose solution, so as to achieve high-content addition of the phase change emulsion to the cellulose solution under the premise of having little effect on the spinnability of the fiber, thereby preparing temperature-regulating cellulose fibers with high enthalpy value.

[0008] To solve the above-mentioned first technical problem, the technical solution of the present invention is:

[0009] A phase change emulsion for phase change temperature regulating cellulose fiber, the phase change emulsion comprises the following components in percentage by mass: 20-30wt% of phase change material, 1-3wt% of nucleating agent with antibacterial function, 1-3wt% of protein colloid particles, 0.3-0.5wt% of surfactant, and the balance is deionized water.

[0010] As an improved technical solution, the phase change material is composed of one or more normal alkanes with 24 to 30 carbon atoms.

[0011] As a preferred technical solution, the phase change material is selected from one or more even-numbered normal alkanes with 24 to 30 carbon atoms.

[0012] As an improved technical solution, the nucleating agent is an organic or inorganic whisker, and the whisker has a length of 200 to 500 nm and a diameter of 100 to 300 nm.

[0013] As an improved technical solution, the whiskers are one or more of titanium dioxide whiskers, chitin whiskers, and four-needle zinc oxide whiskers.

[0014] As an improved technical solution, the protein colloid particles can be plant protein colloid, animal protein colloid, or a mixture of the two.

[0015] As an improved technical solution, the surfactant is one or more of sodium dodecylbenzene sulfonate, sodium pyrophosphate, and sodium hexametaphosphate.

[0016] To solve the above second technical problem, the technical solution of the present invention is:

[0017] A method for preparing phase-change temperature-regulating cellulose fibers, using the phase-change emulsion, comprises the following steps:

[0018] (1) Preparing a phase change emulsion: adding deionized water to a reaction kettle, adding the nucleating agent, stirring evenly, then adding the surfactant, stirring until the surfactant is completely dissolved; then heating to 70-75° C., adding the phase change material, stirring at a speed of 1000-2000 r / min, stirring for 30-60 min, and finally adding the colloidal particles and continuing to stir for 30-60 min to obtain the phase change emulsion;

[0019] (2) Preparation of phase change spinning solution: using pulp as a raw material to prepare a cellulose solution, and then using a pre-spinning injection method, adding the phase change emulsion in an effective amount of 10 to 40 wt% of the methyl cellulose in the cellulose solution to the cellulose solution to obtain a phase change spinning solution;

[0020] (3) Spinning: The phase change spinning solution is coagulated in a spinning coagulation bath, and then drawn in an air bath. The phase change fiber is then cut, desulfurized, pickled, washed, bleached, oiled and dried to prepare a phase change temperature regulating fiber.

[0021] As an improved technical solution, the air bath is a closed high-temperature air bath, and the temperature of the air bath is 70-80°C.

[0022] As an improved technical solution, the length of the air bath is 6 to 8 meters.

[0023] As an improved technical solution, the desulfurization step uses sodium sulfite, the desulfurization temperature is 45-50°C, and the desulfurization bath concentration is 8-10g / L.

[0024] As an improved technical solution, the cellulose solution has a methyl cellulose content of 8.8-9.8%, a viscosity of 40-55s, a maturity of 10.0-16.0ml, and an alkali content of 6.5-7.5%.

[0025] As an improved technical solution, the composition of the spinning coagulation bath is: 100-120 g / L sulfuric acid, 8-16 g / L zinc sulfate, 300-330 g / L sodium sulfate; the coagulation bath temperature is 38-45°C.

[0026] As a preferred technical solution, the steps for preparing the cellulose solution are:

[0027] The pulp is reacted with alkali solution to generate alkali cellulose, which is then squeezed to remove excess alkali solution in the alkali cellulose and then enters a crusher. The crushed alkali cellulose is aged. After the aging is completed, the alkali cellulose that reaches a certain viscosity is measured and then enters a yellowing machine to react with carbon disulfide to generate cellulose sulfonate, which is then dissolved, mixed, filtered, degassed, and matured to prepare a cellulose solution for spinning.

[0028] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] The phase change emulsion for phase change temperature regulating fiber of the present invention comprises the following composition in mass percentage: 20-30wt% of phase change material, 1-3wt% of nucleating agent with antibacterial function, 1-3wt% of protein colloid particles, 0.3-0.5wt% of surfactant, and the balance is deionized water. Adding whisker nucleating agent to the phase change emulsion can transform the original homogeneous nucleation into heterogeneous nucleation, thereby accelerating the crystallization speed, refining the grain structure, shortening the crystallization time, and preventing the crystallization temperature range from being too large, that is, reducing the supercooling degree. At the same time, the phase change emulsion forms an oily protective layer on the surface of the nucleating agent, which effectively reduces the effect of the coagulation bath on the nucleating agent. In particular, the present invention uses a crystal nucleus with antibacterial effect, so the prepared fiber also has antibacterial function. After adding protein colloid particles to the phase change emulsion, a Pickering emulsion is formed, which not only better emulsifies and disperses the phase change material, but also the unique oil-water interface stability formed by the colloid particles is better, has a certain viscosity, and the colloid particles used are protein colloids, and adding protein makes the fiber more silky. Therefore, the phase change emulsion of the present invention has low supercooling and good compatibility with the cellulose solution, good spinnability when spinning under the premise of the same addition amount as the phase change microcapsules in the prior art, stable production process, and high fiber strength after spinning.

[0030] The preparation method of the phase-change thermostatic cellulose fiber of the present invention uses the phase-change emulsion to prepare the phase-change thermostatic fiber, and the functional material added is the phase-change emulsion. Compared with the phase-change microcapsules in the prior art, the phase-change microcapsules are solid particles. If the amount added is too much, they will condense in front of the nozzle, which will inevitably affect the spinnability of the fiber during spinning. If the amount added is too little, the phase-change effect of the phase-change material will not achieve the use effect. The present invention directly adds the phase-change emulsion, and except for a small amount of nucleating agent which is a solid particle in the emulsion, the rest are liquid. The phase-change emulsion has good compatibility with the cellulose solution, and the two will not form resistance when sprayed from the nozzle. Therefore, not only the spinning spinnability is good, but also the physical and mechanical properties of the fiber are less affected. In particular, compared with the phase-change microcapsules, the phase-change emulsion has low preparation cost and simple process, so the cost of the fiber will also be low. The capsule wall of the phase change microcapsule does not have any phase change effect, and the main materials of the phase change emulsion of the present invention are all alkane materials that can undergo phase change. Therefore, at the same addition amount, the phase change emulsion produces a higher enthalpy value and also has a better antibacterial effect.

[0031] The phase-change temperature-regulating cellulose fiber prepared by the invention has a melting enthalpy of ≥60 J / g, a crystallization enthalpy of ≥60 J / g, a supercooling degree of ≤2°C, an antibacterial rate of staphylococcus aureus of ≥90%, an antibacterial rate of escherichia coli of ≥90%, and an antibacterial rate of candida albicans of ≥80%.

[0032] In order to effectively prevent the loss of phase change materials, the present invention adopts air bath drawing in the post-processing step and air bath molding. The ordinary viscose fiber production line tow enters the second bath (using high-temperature water greater than 90°C) for further molding after leaving the coagulation bath. The present invention uses an air bath to effectively reduce the loss of phase change materials during the molding process compared to a water bath. In addition, the ordinary viscose fiber post-processing desulfurization uses sodium hydroxide above 80°C for desulfurization. The present invention reduces the desulfurization temperature and uses a milder sodium sulfite as a desulfurizer, which is more friendly to the fiber. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0034] Example 1

[0035] A phase change emulsion for phase change temperature regulating cellulose fiber comprises the following components in percentage by mass: 21.5 wt% of n-tetracosane as a phase change material, 1.2 wt% of titanium dioxide whiskers with a whisker length of 200-300 nm and a diameter of 100-120 nm, 1.2 wt% of soybean protein colloid particles, 0.3 wt% of sodium dodecylbenzene sulfonate as a surfactant, and 75.8 wt% of deionized water.

[0036] Example 2

[0037] A phase change emulsion for phase change temperature regulating cellulose fiber comprises the following components in percentage by mass: 25 wt% of phase change material n-hexacosane, 1.9 wt% of chitin whiskers with whisker length of 220-400 nm and diameter of 150-200 nm, 2.1 wt% of wool protein colloid particles, 0.4 wt% of surfactant sodium pyrophosphate, and 70.6 wt% of deionized water.

[0038] Example 3

[0039] A phase change emulsion for phase change temperature regulating cellulose fiber comprises the following components in percentage by mass: 28 wt% of phase change material n-octacosane, 2.8 wt% of tetra-needle zinc oxide whiskers with whisker length of 300-400 nm and diameter of 180-220 nm, 2.9 wt% of feather protein colloid particles, 0.45 wt% of surfactant sodium hexametaphosphate, and 65.85 wt% of deionized water.

[0040] Example 4

[0041] (1) Preparing a phase change emulsion: adding deionized water and a nucleating agent in the reaction kettle according to the addition amount of Example 1, adding the surfactant after stirring evenly, and stirring until the surfactant is completely dissolved; heating the liquid to 70°C and adding the phase change material, stirring at a speed of 1000 r / min, stirring for 60 min, and finally adding the colloidal particles and continuing to stir for 30 min to obtain the phase change emulsion; using a laser particle size analyzer to detect that the emulsion particle size D90 is 0.802 μm, and vacuum degassing is performed.

[0042] (2) Preparation of phase change spinning solution: Pulp is reacted with alkali solution to generate alkali cellulose, which is then squeezed to remove excess alkali solution and then fed into a pulverizer. The pulverized alkali cellulose is aged, and the alkali cellulose that has reached a certain viscosity after being metered is fed into a yellowing machine to react with carbon disulfide to generate cellulose sulfonate, which is then dissolved, mixed, filtered, degassed, and matured to generate a cellulose solution for spinning. The methyl cellulose content in the solution is 9.10%, the viscosity is 45s, the degree of maturity is 12.3ml, and the alkali content is 6.67%. Then, the phase change emulsion is added to the cellulose solution by pre-spinning injection method at an effective content of 30wt% of the methyl cellulose in the cellulose solution, and the blended rubber is mixed evenly in a dynamic mixer to obtain a phase change spinning solution;

[0043] (3) Spinning: the phase change spinning solution is passed through a spinning coagulation bath, wherein the composition of the spinning coagulation bath is: 106 g / L sulfuric acid, 10 g / L zinc sulfate, and 310 g / L sodium sulfate; the temperature of the coagulation bath is 41°C; after coagulation, the solution enters a closed air bath with a length of 6 m and a temperature of 72°C for stretching, and then is cut, desulfurized, pickled, washed, bleached, oiled, and dried; the desulfurization temperature is 45°C, and the concentration of sodium sulfite in the desulfurization bath is 10.0 g / L; and phase change temperature-controlled cellulose fibers are prepared.

[0044] Example 5

[0045] (1) Preparing a phase change emulsion: adding deionized water and a nucleating agent in a reaction kettle according to the addition amount of Example 2, adding the surfactant after stirring evenly, and stirring until the surfactant is completely dissolved; heating the liquid to 72° C. and adding the phase change material, stirring at a speed of 1500 r / min, stirring for 40 min, and finally adding the colloidal particles and continuing to stir for 40 min to obtain the phase change emulsion; using a laser particle size analyzer to detect that the emulsion particle size D90 is 0.942 μm, and vacuum degassing is performed.

[0046] (2) Preparation of phase change spinning solution: Pulp is reacted with alkali solution to generate alkali cellulose, which is then squeezed to remove excess alkali solution and then fed into a pulverizer. The pulverized alkali cellulose is aged, and the alkali cellulose that has reached a certain viscosity after being metered is fed into a yellowing machine to react with carbon disulfide to generate cellulose sulfonate, which is then dissolved, mixed, filtered, degassed, and matured to generate a cellulose solution for spinning. The methyl cellulose content in the solution is 9.36%, the viscosity is 42s, the degree of maturity is 14.6ml, and the alkali content is 6.94%. Then, the phase change emulsion is added to the cellulose solution by pre-spinning injection method at an effective content of 28wt% of the methyl cellulose in the cellulose solution, and the blended rubber is mixed evenly in a dynamic mixer to obtain a phase change spinning solution;

[0047] (3) Spinning: the phase change spinning solution is passed through a spinning coagulation bath, wherein the composition of the spinning coagulation bath is: 110 g / L sulfuric acid, 12 g / L zinc sulfate, and 320 g / L sodium sulfate; the temperature of the coagulation bath is 42°C; after coagulation, the solution enters a closed air bath with a length of 6 m and a temperature of 74°C for stretching, and then is cut, desulfurized, pickled, washed, bleached, oiled, and dried; the desulfurization temperature is 48°C, and the concentration of sodium sulfite in the desulfurization bath is 9.4 g / L; and phase change temperature-controlled cellulose fibers are prepared.

[0048] Example 6

[0049] (1) Preparing a phase change emulsion: adding deionized water and a nucleating agent in the reaction kettle according to the addition amount of Example 3, adding the surfactant after stirring evenly, and stirring until the surfactant is completely dissolved; heating the liquid to 75°C and adding the phase change material, stirring at a speed of 2000 r / min, stirring for 30 min, and finally adding the colloidal particles and continuing to stir for 45 min to obtain the phase change emulsion; using a laser particle size analyzer to detect that the emulsion particle size D90 is 0.968 μm, and vacuum degassing is performed.

[0050] (2) Preparation of phase change spinning solution: Pulp is reacted with alkali solution to generate alkali cellulose, which is then squeezed to remove excess alkali solution and then fed into a pulverizer. The pulverized alkali cellulose is aged, and the alkali cellulose that has reached a viscosity after aging is metered and fed into a yellowing machine to react with carbon disulfide to generate cellulose sulfonate, which is then dissolved, mixed, filtered, degassed, and matured to generate a cellulose solution for spinning. The methyl cellulose content in the solution is 9.63%, the viscosity is 52s, the degree of maturity is 13.6ml, and the alkali content is 7.28%. Then, the phase change emulsion is added to the cellulose solution by pre-spinning injection method at an effective content of 38wt% of the methyl cellulose in the cellulose solution, and the blended rubber is mixed evenly in a dynamic mixer to obtain a phase change spinning solution;

[0051] (3) Spinning: the phase change spinning solution is passed through a spinning coagulation bath, wherein the composition of the spinning coagulation bath is: 115 g / L sulfuric acid, 13.2 g / L zinc sulfate, and 325 g / L sodium sulfate; the temperature of the coagulation bath is 44.5°C; after coagulation, the solution enters a closed air bath with a length of 6 m and a temperature of 78°C for stretching, and then is cut, desulfurized, pickled, washed, bleached, oiled, and dried; the desulfurization temperature is 50°C, and the concentration of sodium sulfite in the desulfurization bath is 8.2 g / L; and phase change temperature-controlled cellulose fibers are prepared.

[0052] Comparative Example 1

[0053] Comparative Example 1 is compared with Example 4:

[0054] There is no step (1) of preparing a phase change emulsion.

[0055] In step (2), the phase change spinning solution preparation step, the cellulose solution is prepared in the same manner as in Example 4, and a phase change microcapsule slurry is added by a pre-spinning injection method (the content of the phase change microcapsules in the phase change microcapsule slurry is 21.5wt%, the capsule core is n-tetracosane, and the ratio of the capsule wall to the capsule core is 20:80). The amount added is 30wt% of the effective content of the phase change microcapsules to the cellulose solution methyl cellulose.

[0056] Step (3) fiber forming and post-processing are the same as in Example 4.

[0057] Comparative Example 2

[0058] Comparative Example 2 is compared with Example 4:

[0059] In step (1) of preparing the phase change emulsion, no nucleating agent is added, and the other steps are the same.

[0060] Step (2) and step (3) are exactly the same as those in Example 4.

[0061] Comparative Example 3

[0062] Comparative Example 3 is compared with Example 4:

[0063] In step (1) of preparing the phase change emulsion, no colloidal particles are added, and the other steps are the same.

[0064] Step (2) and step (3) are exactly the same as those in Example 4.

[0065] The phase change temperature regulating cellulose fibers prepared in the above Examples 4 to 6 and Comparative Examples 1 to 3 have been tested for physical and mechanical properties, antibacterial properties, enthalpy values ​​and other performance indicators as shown in Table 1 below.

[0066] Table 1

[0067]

[0068]

[0069] From the above data, it can be seen that Example 4 and Comparative Example 1 use the same cellulose solution preparation steps, and the spinning and post-treatment steps are exactly the same. Comparative Example 1 only replaces the phase change emulsion with the phase change microcapsule of the prior art. The prepared phase change fiber has not only significantly reduced physical and mechanical properties, but also greatly reduced melting enthalpy and crystallization enthalpy, and increased supercooling because a large amount of solid microcapsule particles are added. Since no antibacterial nucleating agent is added to Comparative Example 1, the fiber has no antibacterial property. Compared with Example 4 and Comparative Example 2, Example 2 is just without adding antibacterial nucleating agent. It can be seen from Table 1 that the supercooling and enthalpy values ​​are obviously affected, and the fiber has no antibacterial property. Compared with Example 4 and Comparative Example 3, Comparative Example 3 does not add colloidal particles, and the stability of the prepared phase change emulsion is not as good as that of Example 4, thus affecting the spinnability of the fiber, which is manifested in that the physical and mechanical properties of the fiber of Comparative Example 3 are lower than those of Example 4 in Table 1. Also, because the phase change emulsion has poor uniformity, the unevenly dispersed emulsion is filtered out by the filter before spinning, resulting in the enthalpy value of the fiber of Comparative Example 3 being slightly lower than that of Example 4.

Claims

1. A phase change emulsion for phase change temperature regulating cellulose fiber, characterized in that The phase change emulsion comprises the following components in percentage by weight: 20-30 wt% of phase change material, 1-3 wt% of nucleating agent with antibacterial function, 1-3 wt% of protein colloid particles, 0.3-0.5 wt% of surfactant, and the balance is deionized water.

2. The phase change emulsion for phase change temperature regulating cellulose fibers according to claim 1, characterized in that: The phase change material is composed of one or more normal alkanes with 24 to 30 carbon atoms.

3. The phase change emulsion for phase change temperature regulating cellulose fiber according to claim 1, characterized in that: The nucleating agent is an organic or inorganic whisker, and the whisker has a length of 200 to 500 nm and a diameter of 100 to 300 nm.

4. The phase change emulsion for phase change temperature regulating cellulose fibers according to claim 3, characterized in that: The whiskers are one or more of titanium dioxide whiskers, chitin whiskers, and tetrapod-shaped zinc oxide whiskers.

5. The phase change emulsion for phase change temperature regulating cellulose fiber according to claim 1, characterized in that: The surfactant is one or more of sodium dodecylbenzene sulfonate, sodium pyrophosphate and sodium hexametaphosphate.

6. A method for preparing phase-change temperature-regulating cellulose fibers, characterized in that Using the phase change emulsion as described in any one of claims 1 to 5, comprising the following steps: (1) Preparing a phase change emulsion: adding deionized water to a reaction kettle, adding the nucleating agent, stirring evenly, then adding the surfactant, stirring until the surfactant is completely dissolved; then heating to 70-75° C., adding the phase change material, stirring at a speed of 1000-2000 r / min, stirring for 30-60 min, and finally adding the colloidal particles and continuing to stir for 30-60 min to obtain the phase change emulsion; (2) Preparation of phase change spinning solution: using pulp as a raw material to prepare a cellulose solution, and then using a pre-spinning injection method, adding the phase change emulsion in an effective amount of 30 to 40 wt% of the methyl cellulose in the cellulose solution to the cellulose solution to obtain a phase change spinning solution; (3) Spinning: The phase change spinning solution is coagulated in a spinning coagulation bath, and then drawn in an air bath. The phase change fiber is then cut, desulfurized, pickled, washed, bleached, oiled and dried to prepare a phase change temperature regulating fiber.

7. The method for preparing phase-change temperature-regulating cellulose fibers according to claim 6, characterized in that: The air bath is a closed high-temperature air bath, and the air bath temperature is 70-80°C.

8. The method for preparing phase-change temperature-regulating cellulose fibers according to claim 6, characterized in that: The desulfurization step uses sodium sulfite for desulfurization, the desulfurization temperature is 45-50° C., and the desulfurization bath concentration is 8-10 g / L.

9. The method for preparing phase-change temperature-regulating cellulose fibers according to claim 6, characterized in that: The cellulose solution has a methyl cellulose content of 8.8-9.8%, a viscosity of 40-55s, a maturity of 10.0-16.0ml, and an alkali content of 6.5-7.5%.

10. The method for preparing phase-change temperature-regulating cellulose fibers according to claim 6, characterized in that: The spinning coagulation bath comprises: 100-120 g / L sulfuric acid, 8-16 g / L zinc sulfate and 300-330 g / L sodium sulfate; the coagulation bath temperature is 38-45°C.

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