Composite spinning material and preparation method thereof, oil guide medium for electronic cigarette, and electronic cigarette

Abstract

The application can make the prepared composite spinning material have higher thermogravimetric temperature and thermal decomposition temperature by selecting the first fiber and the second fiber and on the basis of reasonably matching the first fiber and the second fiber, so as to have higher heat resistance temperature; when the composite spinning material is applied to the electronic cigarette heat-conducting medium, the electronic cigarette taste attenuation problem caused by the weakening of the oil guiding ability can be delayed or avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic cigarettes, in particular to a composite filament material and a preparation method thereof, an oil guide medium for electronic cigarettes, and an electronic cigarette. BACKGROUND

[0002] Electronic cigarettes have the advantages of health, environmental protection, and safety, and gradually become the preferred cigarette substitute for consumers. An atomizer is one of the main components of an electronic cigarette, which is used to heat and atomize tobacco oil to generate smoke, thereby achieving the effect of simulating a cigarette.

[0003] The atomizer includes an atomizing core and a liquid storage cavity, wherein the atomizing core includes a heating wire, an oil guide medium, and an atomizing support. Since the cotton fiber bundle can conduct the absorbed lubricating oil or lubricant between the fibers and achieve the oil guide function through capillary action, cotton fibers are usually used as the oil guide medium. However, the temperature of the heating wire during the suction work is as high as 250°C, and for the cotton fibers close to the heating wire, they are in a continuous high-temperature baking state. However, the heat-resistant temperature of cotton fibers is low, and the capillary action decreases after being heated, which weakens the oil guide ability and further causes the taste attenuation. SUMMARY

[0004] Based on this, the present application provides a composite filament material and a preparation method thereof, an oil guide medium for electronic cigarettes, and an electronic cigarette. The composite filament material provided by the present application has a high heat-resistant temperature and a high thermal decomposition temperature, and thus has a high heat-resistant temperature. When used as an oil guide medium for an electronic cigarette, the composite filament material can delay or avoid the problem of taste attenuation of the electronic cigarette caused by the weakening of the oil guide ability.

[0005] In a first aspect, the present application provides a composite filament material, and the preparation raw material of the composite filament material includes first fibers and second fibers with a mass ratio of 1:(0.01-0.05).

[0006] The first fibers include one or more of cotton fibers, wood fibers, bamboo fibers, reed fibers, hemp stem core fibers, and sugarcane residue fibers.

[0007] The second fibers include hemp fibers.

[0008] In one of the embodiments, the composite filament material has one or more of the following characteristics:

[0009] (1) The fiber diameter of the composite filament material is 10-15 μm.

[0010] (2) The heat-resistant temperature of the composite filament material is ≥ 295°C.

[0011] (3) The thermal decomposition temperature of the composite filament material is ≥ 333°C.

[0012] In a second aspect of the present application, a preparation method of the composite spinning material according to any one of the first aspect of the present application is provided, comprising the following steps:

[0013] The first fiber and the second fiber are taken according to a mass ratio;

[0014] The first fiber and the second fiber are immersed in an impregnation solution for an enzymatic reaction to prepare pulp;

[0015] An alkaline aqueous solution is added to the pulp to terminate the enzymatic reaction, and after part of the water is removed, the pulp is crushed to prepare pulp particles;

[0016] An organic spinning solvent is added to the pulp particles, and after the water in the pulp particles is removed, an organic spinning solution is prepared;

[0017] The organic spinning solution is filtered, spun, and solidified to prepare the composite spinning material.

[0018] In one embodiment, the preparation method has one or more of the following characteristics:

[0019] (1) The impregnation solution comprises inorganic acid and biological enzyme; wherein the inorganic acid comprises one or more of sulfuric acid, hydrochloric acid, and acetic acid; and the biological enzyme comprises cellulase;

[0020] (2) The alkaline aqueous solution comprises one or more of sodium hydroxide aqueous solution and potassium hydroxide aqueous solution;

[0021] (3) The organic spinning solvent comprises one or more of methanol, ethanol, acetone, dimethyl sulfoxide, chloroform, and N-methyl morphine-4-oxide.

[0022] In one embodiment, the process parameters of the enzymatic reaction include an enzymatic reaction temperature of 60-90°C.

[0023] In one embodiment, the step of removing the water in the pulp particles comprises:

[0024] The mixed pulp solution comprising the pulp particles and the organic spinning solvent is spread into a thin layer, and the water in the pulp particles is removed under a vacuum degree of ≤-98 KPa to prepare the organic spinning solution;

[0025] The mass concentration of cellulose in the organic spinning solution is 10-30%.

[0026] In one embodiment, the process parameters of the spinning include a spinning speed of 500-1000 m / min.

[0027] In one embodiment, after the solidification step, the method further comprises:

[0028] The cured fiber yarns are washed, cut into short fibers;

[0029] The short fibers are oiled and dried.

[0030] In a third aspect of the present application, an oil guide medium for an electronic cigarette is provided, comprising the composite yarn material according to any one of the first aspect of the present application.

[0031] In a fourth aspect of the present application, an electronic cigarette is provided, comprising the oil guide medium for an electronic cigarette according to the third aspect of the present application.

[0032] The composite yarn material provided by the present application has a high heat resistance temperature and a high thermal decomposition temperature by selecting the first fiber and the second fiber, so that the composite yarn material can delay or avoid the problem of electronic cigarette taste attenuation caused by weakening of the oil guide ability when the composite yarn material is applied to the electronic cigarette heat guide medium. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A scanning electron microscope image of the composite fiber material prepared in Example 1 of the present application;

[0034] Figure 2 A thermogravimetric diagram of the composite fiber material prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0035] The composite yarn material, the preparation method thereof, the oil guide medium for an electronic cigarette, and the electronic cigarette are further fully and clearly described below in combination with specific examples. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0036] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum value and the maximum value of the range, as well as every value between the minimum value and the maximum value. Further, when the range refers to an integer, every integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe a feature or a characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise indicated or contradictory, the terms or phrases used herein have the following meanings:

[0038] In the present application, "multiple", "various", "multiple times", "multiple", etc. are referred to, without special limitation, more than 2 or equal to 2 in quantity. For example, "one or more" means one or more than two.

[0039] In the present application, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only for description purposes, and cannot be understood as indicating or implying relative importance or quantity, nor can it be understood as implying the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration description, and should be understood as not constituting a closed limitation on the quantity.

[0040] In the present application, the technical features described in an open manner include both the closed technical solution consisting of the listed features and the open technical solution containing the listed features.

[0041] In the present application, "preferably", "better", "better", "as appropriate" are only for describing better implementation or embodiments, and should be understood as not constituting a limitation on the scope of protection of the present application.

[0042] In the present application, "further", "further", "especially" and the like are used for description purposes, indicating differences in content, but should not be understood as limiting the scope of protection of the present application.

[0043] In the present application, "optionally", "optional", "optional" means optional, that is, including "yes" or "no" in two parallel schemes. If there are multiple "optional" in a technical solution, unless otherwise specified, and there is no contradiction or mutual restriction relationship, each "optional" is independent.

[0044] In the present application, the numerical interval (i.e. the numerical range) is referred to, without special specification, and the optional numerical distribution within the above numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e. the minimum value and the maximum value) of the numerical range, and every value between the two numerical endpoints. Without special specification, when the numerical interval only points to the integer within the numerical interval, including the two endpoint integers of the numerical range and every integer between the two endpoints, in this article, it is equivalent to directly listing each integer, such as t is an integer including 1-10, which means that t is any integer in the integer group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe characteristics or properties, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0045] The temperature parameter in the present application, if not particularly limited, allows for constant temperature treatment, and also allows for variation within a certain temperature range. It should be understood that the constant temperature treatment allows for fluctuations within the accuracy range controlled by the instrument. Fluctuations within a range such as ±5°C, ±4°C, ±3°C, ±2°C, ±1°C are allowed.

[0046] In the present application, the percentage concentration refers to the final concentration if not particularly specified. The final concentration refers to the proportion of the added component in the system after the component is added.

[0047] Because the existing cotton fiber has low heat-resistant temperature, the capillary effect decreases after heating, the oil guiding ability decreases in the middle and late stages, and thus the taste decays.

[0048] Based on this, the first aspect of the present application provides a composite spinning material, and the preparation raw material of the composite spinning material includes first fibers and second fibers with a mass ratio of 1:(0.01-0.05).

[0049] The first fibers include one or more of cotton fibers, wood fibers, bamboo fibers, reed fibers, bast core fibers, and sugarcane residue fibers; and the second fibers include hemp fibers.

[0050] The first fibers have good renewability and are environmentally friendly and easy to obtain; the second fibers refer to fibers obtained from various hemp plants. By selecting the first fibers and the second fibers and reasonably matching the first fibers and the second fibers, the prepared composite spinning material has high heat-resistant temperature and thermal decomposition temperature, and thus has high heat-resistant temperature; when the composite spinning material is applied to an electronic cigarette heat-conducting medium, the electronic cigarette taste decay problem caused by the decrease in oil guiding ability can be delayed or avoided.

[0051] Understandably, the mass ratio of the first fibers to the second fibers in the present application can include any value between 1:(0.01-0.05). Specifically, the mass ratio of the first fibers to the second fibers includes but is not limited to 1:0.01, 1:0.02, 1:0.03, 1:0.04, or 1:0.05.

[0052] To ensure the capillary effect of the composite spinning material as an oil guiding medium, preferably, the first fibers are cotton fibers.

[0053] The fiber diameter plays an important role in the interface properties of the composite filament material, so as to ensure the contact area and liquid transmission efficiency of the composite filament material and the liquid medium. In one example, the diameter of the composite filament material is 10-15 μm. It can be understood that the diameter of the composite filament material is 10-15 μm, which can include any value between 10-15 μm. Specifically, the diameter of the composite filament material includes but is not limited to 10 μm, 11 μm, 11.5 μm, 12 μm, 12.1 μm, 12.2 μm, 12.3 μm, 12.35 μm, 12.39 μm, 12.4 μm, 12.5 μm, 13 μm, 14 μm or 15 μm.

[0054] In one example, the thermal gravimetric temperature of the composite filament material is ≥ 295℃. The temperature of the heating wire in the electronic cigarette during the suction work is 250℃, and the thermal gravimetric temperature of the composite filament material provided by the application is 45℃ higher than the working temperature, so that the heat resistance performance is excellent, and when used as a heat conduction medium of the electronic cigarette, the electronic cigarette taste attenuation problem caused by the weakening of the oil guiding ability can be delayed or avoided.

[0055] In one example, the thermal gravimetric temperature of the composite filament material is ≥ 333℃.

[0056] In a second aspect, the application provides a preparation method of the composite filament material according to any one of the examples of the first aspect of the application, comprising the following steps:

[0057] The first fiber and the second fiber are taken according to the mass ratio;

[0058] The first fiber and the second fiber are immersed in the impregnation solution for enzymatic reaction to prepare pulp;

[0059] An alkaline aqueous solution is added to the pulp to terminate the enzymatic reaction, and after removing part of the water, the pulp is crushed to prepare pulp particles;

[0060] An organic spinning solvent is added to the pulp particles for mixing, and after removing the water in the pulp particles, an organic spinning solution is prepared;

[0061] The organic spinning solution is filtered and spun, and then solidified to prepare the composite filament material.

[0062] In order to avoid the existence of metal impurities in the first fiber and the second fiber, and thus damage or safety hazards to the subsequent process. In one example, before the step of immersing the first fiber and the second fiber in the impregnation solution for enzymatic reaction, the method further comprises the step of metal detection of the first fiber and the second fiber.

[0063] In one example, the impregnation solution includes an inorganic acid and a biological enzyme. In the present application, the purpose of including an inorganic acid in the impregnation solution is to provide an acidic environment for the enzymatic hydrolysis of the first fibers and the second fibers. The pH of the impregnation solution can be increased to 4.5-7.0 by adding acid. The acid can include one or more of sulfuric acid, hydrochloric acid, and acetic acid.

[0064] In addition, the biological enzyme includes cellulase. By selecting an impregnation solution including cellulase and setting the enzymatic hydrolysis temperature to 60-90°C, the cellulase can break the hydrogen bonds in the cellulose molecules, thereby increasing the enzymatic hydrolysis speed and improving the degradation efficiency of the first fibers and the second fibers. It can be understood that the enzymatic hydrolysis temperature includes but is not limited to 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, or 90°C.

[0065] In one example, the mass ratio of the first fibers and the second fibers to the cellulase is 1:(0.01-0.1). It can be understood that the mass ratio of the first fibers and the second fibers to the cellulase can include any value between 1:(0.01-0.1). Specifically, the mass ratio of the first fibers and the second fibers to the cellulase includes but is not limited to 1:0.01, 1:0.02, 1:0.05, 1:0.08, 1:0.09, or 1:0.1.

[0066] In one example, the alkaline aqueous solution includes one or more of sodium hydroxide aqueous solution and potassium hydroxide aqueous solution. In the present application, to stop the enzymatic hydrolysis reaction, the alkaline solution can be added to a pH>8. The alkaline solution can neutralize the effect of the enzyme, effectively stop the enzymatic hydrolysis reaction, and stabilize the chemical properties of the pulp.

[0067] In one example, the organic spinning solvent includes one or more of methanol, ethanol, acetone, dimethyl sulfoxide, chloroform, and N-methylmorpholine-4-oxide (NMMO).

[0068] Due to the interaction between the cellulose molecular chains and the water in the micropores and pores thereof, preliminary water removal cannot remove all the water. To further remove the water from the cellulose, further dehydration treatment is required.

[0069] In one example, the step of removing the water from the pulp particles includes spreading the mixed pulp solution including the pulp particles and the organic spinning solvent into a thin layer, and removing the water from the pulp particles under a vacuum degree of ≤-98 KPa to prepare an organic spinning solution.

[0070] In the organic spinning solution, the mass concentration of the cellulose is 10%-30%. During the dehydration process, the water content decreases, and the content of the organic spinning solvent increases accordingly, thereby preparing the organic spinning solution.

[0071] In one of the examples, the process parameters of the spinning include: the spinning speed is 500m / min-1000m / min.

[0072] In one of the examples, after the solidification step, further comprising:

[0073] washing the solidified fiber, cutting into short fibers;

[0074] oiling and drying the short fibers.

[0075] In one of the specific examples, the method for preparing the composite spinning material includes the following steps:

[0076] S10. Selecting the first fiber and the second fiber with a mass ratio of 1:(0.01-0.05), and after metal detection, immersing the first fiber and the second fiber in an impregnation solution with a pH of 4.5-7.0 and containing cellulase, so that the mass ratio of the first fiber and the second fiber to the cellulase is 1:(0.01-0.1);

[0077] S20. Enzymatic reaction of the first fiber and the second fiber in the impregnation solution at a temperature of 60-90°C, and the enzymatic reaction time is 1-10h, to prepare pulp;

[0078] S30. Adding lye to the pulp prepared in step S20 to adjust the pH>8 to stop the enzymatic reaction, and after stirring, removing the liquid by a press machine and sending it to a pulverizer for crushing to prepare pulp particles with a particle size of 8-300μm;

[0079] S40. Mixing the pulp particles prepared in step S30 with an organic spinning solvent according to a weight ratio of 1:(4-10) to prepare a pulp solution; spreading the mixed pulp solution including the pulp particles and the organic spinning solvent into a thin layer, and removing the water from the pulp particles under a vacuum degree of ≤-98KPa to prepare an organic spinning solution; wherein the mass concentration of cellulose in the organic spinning solution is 10%-30%;

[0080] S50. Filtering the organic spinning solution prepared in step S40 to remove solid impurities, and sending it to a spinning assembly to be extruded through a spinneret, wherein the spinning speed is 500m / min-1000m / min, the number of spinneret holes is 1000-2000, and the fiber with a diameter of 10-15μm is prepared after solidification;

[0081] S60. Washing the fiber prepared in step S50 to make the residual amount of the solvent in the fiber <1.5%, cutting the fiber into short fibers after washing, and preparing a composite fiber material after oiling and drying.

[0082] In one example, the length of the cut staple fiber is 3mm to 10mm in step S60.

[0083] To enable the composite spun material to meet the actual performance needs, in one example, after the step of S60, further comprising:

[0084] S70. After the composite fiber material prepared in step S60 is opened, mixed, carded, crosslinked laid, drawn, pre-wetted, forward and reverse hydroentangled, finished, dried and wound into a shape, a textile product is prepared. Understandably, the textile product herein includes but is not limited to an electronic cigarette oil guide medium.

[0085] In step S70, the composite fiber material is opened and mixed, which can untangle and interleave the composite fiber material to achieve uniform fiber dispersion. This helps the subsequent process to proceed smoothly and improves the operability and processability of the fiber. Through the carding process, the composite fiber material can be further arranged to remove impurities, coarse fibers and short fibers and other undesirable fiber materials; and further improve the fiber parallelism and neatness to provide better fiber quality for subsequent processing steps.

[0086] In the step of cross-laying, the fibers are cross-laid to form the basic structure of the textile, which helps to improve the strength, stability and uniformity of the textile, so that the textile can withstand tension and deformation without easy deformation. Through the drawing process, the cross-laid textile is elongated under a certain tensile force, changing the arrangement and structure of the fibers, thereby improving the strength, elasticity and softness of the textile.

[0087] Before forward and reverse hydroentanglement, pre-wetting treatment is performed to soak the textile in a suitable liquid medium to fully absorb the moisture in the fibers, increase the adhesion between the fibers, and facilitate the next step of water jet processing. Through the water jet process, the impact force of high-speed water jet and the penetration of water flow make the fibers interlock and combine under the action of water flow. Water jet can increase the density, strength and uniformity of the textile.

[0088] The textile after water jet processing is subjected to post-processing processes such as ironing, trimming, printing and dyeing, which helps to improve the texture, gloss and appearance of the textile, meeting the requirements of different needs and purposes. Further, the processed textile is dried to remove excess moisture and improve the stability and dryness of the textile. Finally, the textile is wound into a shape, making it easy to transport, store and use.

[0089] In a third aspect of the present application, an electronic cigarette oil guide medium is provided, comprising the composite spun material of any one of the examples of the first aspect of the present application.

[0090] The application can make the prepared composite spinning material have higher thermogravimetric temperature and thermal decomposition temperature by selecting the first fiber and the second fiber and reasonably matching the first fiber and the second fiber, so as to have higher heat resistance temperature; when the composite spinning material is applied to the electronic cigarette heat-conducting medium, the electronic cigarette taste attenuation problem caused by the weakening of the oil guiding ability can be delayed or avoided.

[0091] In a fourth aspect, the application provides an electronic cigarette comprising the electronic cigarette oil guiding medium according to the third aspect.

[0092] The following specific examples are provided to further illustrate the application, but the application is not limited to the following examples. Unless otherwise specified, the raw materials used in the examples are commercially available products.

[0093] Example 1

[0094] Example 1 provides a composite spinning material and a preparation method thereof, and the specific steps are as follows:

[0095] (1) Selecting cotton fiber and hemp fiber with a mass ratio of 1:0.05, after metal detection, immerse the cotton fiber and hemp fiber in an impregnation solution with a pH of 5 and containing cellulase, so that the mass ratio of the cotton fiber and hemp fiber to the cellulase is 1:0.1;

[0096] (2) Enzymatic hydrolysis of the cotton fiber and hemp fiber in the impregnation solution at a temperature of 90°C, after 3h of enzymatic hydrolysis, pulp is prepared;

[0097] (3) Adding sodium hydroxide aqueous solution to the pulp prepared in step (2) to adjust the pH to 9, stopping the enzymatic hydrolysis reaction, removing the liquid by a press after stirring, and sending it to a pulverizer for pulverization to prepare pulp particles with a particle size of 50-200μm;

[0098] (4) Mixing the pulp particles prepared in step (3) with N-methylmorpholine-4-oxide (NMMO) according to a weight ratio of 1:4 to prepare a slurry; spreading the mixed slurry including the pulp particles and N-methylmorpholine-4-oxide (NMMO) into a thin layer, dehydrating under a vacuum degree of-98KPa to prepare an organic spinning solution; wherein the mass concentration of cellulose in the organic spinning solution is 30%;

[0099] (5) Filtering the organic spinning solution prepared in step (4) to remove solid impurities, and sending it to a spinning assembly, extruding through a spinneret with a spinning speed of 800m / min and a spinneret hole number of 2000 holes, and preparing fiber filaments with a diameter of 12.38μm after solidification;

[0100] (6) washing the fiber yarn prepared in step (5) to make the residual amount of solvent in the fiber yarn < 1.5%, cutting the fiber yarn into short fibers after washing, and preparing the composite fiber material after oiling and drying.

[0101] The scanning electron microscope image of the composite fiber material prepared in Example 1 is shown in FIG. 1. Figure 1 As shown in FIG. 1, it can be seen that the composite fiber prepared in Example 1 has a smooth surface and is round; and the average diameter of the cross section thereof is 12.38 μm. Figure 1

[0102] Example 2

[0103] In one specific example, the method for preparing the composite yarn material includes the following steps:

[0104] (1) selecting cotton fibers and hemp fibers with a mass ratio of 1:0.01, and immersing the cotton fibers and hemp fibers in an impregnation solution with a pH of 6 and including cellulase after metal detection, so that the mass ratio of the cotton fibers and hemp fibers to the cellulase is 1:0.05;

[0105] (2) performing enzymatic reaction on the cotton fibers and hemp fibers in the impregnation solution at a temperature of 70°C, and preparing pulp after 2 h of enzymatic reaction;

[0106] (3) adding lye to the pulp prepared in step (2) to adjust the pH to 8.5, stopping the enzymatic reaction, removing the liquid by a press after stirring, and preparing pulp particles with a particle size of 50-200 μm by crushing in a pulverizer;

[0107] (4) mixing the pulp particles prepared in step (3) with N-methylmorpholine-4-oxide (NMMO) according to a weight ratio of 1:4 to prepare a slurry; spreading the mixed slurry including the pulp particles and N-methylmorpholine-4-oxide (NMMO) into a thin layer, and preparing an organic spinning solution by dehydration under a vacuum degree of -100 KPa; wherein the mass concentration of cellulose in the organic spinning solution is 20%;

[0108] (5) filtering the spinning solution prepared in step (4) to remove solid impurities, and feeding the spinning solution into a spinning assembly to be extruded through a spinneret, wherein the spinning speed is 500 m / min, the number of holes of the spinneret is 1000, and the fiber yarn with a diameter of 10 μm is prepared after solidification;

[0109] (6) washing the fiber yarn prepared in step (5) to make the residual amount of solvent in the fiber yarn < 1.5%, cutting the fiber yarn into short fibers after washing, and preparing the composite fiber material after oiling and drying.

[0110] Example 3

[0111] ​Example 3 is substantially the same as Example 1, except that the mass ratio of the cotton fiber and the hemp fiber is 1:0.025. The specific steps are as follows:

[0112] (1) cotton fiber and hemp fiber with a mass ratio of 1:0.025 are selected, and after the cotton fiber and hemp fiber are detected by a metal detector, they are immersed in an impregnation solution with a pH of 5 and including cellulase, so that the mass ratio of the cotton fiber and hemp fiber to the cellulase is 1:0.08;

[0113] (2) the cotton fiber and hemp fiber are subjected to enzymatic hydrolysis reaction in the impregnation solution at a temperature of 90°C, and after 2.5h of enzymatic hydrolysis reaction, pulp is prepared;

[0114] (3) sodium hydroxide aqueous solution is added to the pulp prepared in step (2) to adjust the pH to 9, the enzymatic hydrolysis reaction is stopped, and after stirring, the liquid is removed by a press and sent to a pulverizer for pulverization to prepare pulp particles with a particle size of 50-200μm;

[0115] (4) the pulp particles prepared in step (3) are mixed with N-methylmorpholine-4-oxide (NMMO) according to a weight ratio of 1:4 to prepare a pulp solution; the mixed pulp solution including the pulp particles and N-methylmorpholine-4-oxide (NMMO) is spread into a thin layer, and an organic spinning solution is prepared under the condition of a vacuum degree of -98KPa; wherein the mass concentration of cellulose in the organic spinning solution is 25%;

[0116] (5) the organic spinning solution prepared in step (4) is filtered to remove solid impurities, and then sent to a spinning assembly to be extruded through a spinneret, wherein the spinning speed is 1000m / min, the number of spinneret holes is 2000, and after solidification, a fiber filament with a diameter of 15μm is prepared;

[0117] (6) the fiber filament prepared in step (5) is washed to make the residual amount of solvent in the fiber filament <1.5%, and after washing, the fiber filament is cut into staple fibers, and after oiling and drying, a composite fiber material is prepared.

[0118] Example 4

[0119] Example 4 is substantially the same as Example 1, except that the cotton fiber is replaced by reed fiber.

[0120] Example 5

[0121] Example 5 is substantially the same as Example 1, except that the cotton fiber is replaced by hemp stem core fiber.

[0122] Example 6

[0123] Example 6 is substantially the same as Example 1, except that the spinning speed is 1000m / min, and the diameter of the prepared fiber filament is 15μm.

[0124] Comparative Example 1

[0125] Cotton fiber is used as Comparative Example 1.

[0126] Comparative Example 2

[0127] Comparative Example 2 is basically the same as Example 1, the main difference is that the mass ratio of cotton fiber and hemp fiber is 1:0.005.

[0128] The fiber materials of the examples and comparative examples are subjected to thermogravimetric experiments in a thermogravimetric instrument, and the corresponding test results are shown in Table 1 and Figure 1 .

[0129] Table 1

[0130] Samples T 15％ (°C) T max (°C) Example 1 302.5 339 Example 2 300.3 335 Example 3 301.7 337 Example 4 297.4 333.6 Example 5 295.5 333.0 Example 6 299.8 337.8 Comparative Example 1 271.2 330.4 Comparative Example 2 272.1 330.9

[0131] As can be seen from Table 1, the thermogravimetric temperature of cotton fiber in Comparative Example 1 is 271.25°C, and the highest thermal decomposition temperature is 330°C. The highest temperature of the heating wire of the electronic cigarette is 250°C when working. The thermogravimetric temperature of the cotton fiber is close to the working temperature, which affects the oil guiding work.

[0132] The thermogravimetric temperature of the composite fiber material prepared in Examples 1-5 of the present application is higher than that of cotton fiber by 24°C, and the thermogravimetric temperature of Example 1 is 302.5°C, which is 31 degrees higher than that of cotton fiber. The temperature is higher than the working temperature of the heating wire, and the highest thermal decomposition temperature of the composite fiber material prepared in Example 1 of the present application is 9 degrees higher than that of cotton fiber. Therefore, the composite fiber material provided in the present application has excellent heat resistance.

[0133] The technical features of the above-described examples can be combined in any way. In order to make the description concise, all possible combinations of the technical features in the above-described examples are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0134] The above-described examples only express several embodiments of the present application, which are convenient for specific and detailed understanding of the technical solutions of the present application, but should not be understood as a limitation on the scope of protection of the patent. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. It should be understood that the technical solutions obtained by the skilled person through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are within the scope of protection of the appended claims of the present application. Therefore, the scope of protection of the patent of the present application should be based on the contents of the appended claims, and the description can be used to explain the contents of the claims.

Claims

1. An oil-conducting medium for electronic cigarettes, characterized in that, The oil-conducting medium for electronic cigarettes includes a composite spinning material. The raw materials for preparing the composite spinning material include a first fiber and a second fiber in a mass ratio of 1:(0.01~0.05). The first fiber includes one or more of cotton fiber, wood fiber, bamboo fiber, reed fiber, hemp stalk core fiber, and sugarcane bagasse fiber. The second fiber includes hemp fiber. The thermal weight loss temperature of the composite spinning material is ≥333℃. The preparation method of the composite spinning material includes the following steps: The first fiber and the second fiber are taken according to the mass ratio; The first fiber and the second fiber are immersed in an impregnation solution and subjected to enzymatic hydrolysis at 60°C to 90°C to prepare pulp; the impregnation solution includes inorganic acids and biological enzymes; wherein the inorganic acids include one or more of sulfuric acid, hydrochloric acid and acetic acid; the biological enzymes include cellulase, and the pH of the impregnation solution is 4.5 to 7.0; An alkaline aqueous solution is added to the pulp to terminate the enzymatic hydrolysis reaction, and after removing some water, the pulp is pulverized to prepare pulp particles. An organic spinning solvent is added to the slurry and mixed, and the water in the slurry is removed to prepare an organic spinning solution; The organic spinning solution is filtered, spun, and solidified to prepare the composite spinning material.

2. The wicking medium for electronic cigarettes according to claim 1, characterized in that, The composite spinning material has one or more of the following characteristics: (1) The fiber diameter of the composite spinning material is 10μm~15μm; (2) The thermogravimetric temperature of the composite spinning material is ≥295℃.

3. The wicking medium for electronic cigarettes according to claim 1, characterized in that, The preparation method has one or more of the following characteristics: (2) The alkaline aqueous solution includes one or more of sodium hydroxide aqueous solution and potassium hydroxide aqueous solution; (3) The organic spinning solvent includes one or more of methanol, ethanol, acetone, dimethyl sulfoxide, chloroform and N-methylmorphine-4-oxide.

4. The wicking medium for electronic cigarettes according to claim 1, characterized in that, The step of removing water from the slurry particles includes: The mixed slurry comprising the slurry particles and the organic spinning solvent is spread into a thin layer, and the water in the slurry particles is removed under a vacuum of ≤-98KPa to prepare the organic spinning solution. The cellulose mass concentration in the organic spinning solution is 10% to 30%.

5. The wicking medium for electronic cigarettes according to claim 1, characterized in that, The spinning process parameters include a spinning speed of 500m / min to 1000m / min.

6. The wicking medium for electronic cigarettes according to any one of claims 1 to 5, characterized in that, Following the curing step, the process further includes: The cured fiber filaments are washed and cut into short fibers; The short fibers are oiled and dried.

7. The wicking medium for electronic cigarettes according to any one of claims 1 to 5, characterized in that, Following the curing step, the process also includes: opening and mixing, combing, cross-linking and web laying, stretching, pre-wetting, forward and reverse hydroentangling, finishing, drying and winding.

8. An electronic cigarette, characterized in that, Includes the oil-conducting medium for electronic cigarettes as described in any one of claims 1 to 7.

Images