An oxidation fiber / flame retardant viscose flame-resistant needle punched felt and its method for dyeing with reactive dyes and isoparaffins

Abstract

The present invention relates to an oxidized fiber / flame-retardant viscose flame-resistant needled felt and an isoparaffin dyeing method for reactive dyes thereof. The method comprises the following steps: S1. Dye dispersion: dispersing the reactive dyes in isoparaffin; S2. Fiber swelling: putting the flame-retardant viscose fiber into the dye liquor and uniformly dispersing the dyes on the fiber surface; S3. Dye dissolution: adding an alkali liquor into the dye liquor to dissolve the dyes; S4. Dyeing and fixation: carrying out dyeing and fixation on the dye liquor at 30-80 °C; S5. Washing: washing the dyed fiber with water and preparing a soap washing liquor for soap washing to obtain the dyed flame-retardant viscose fiber; S6. Needling: mixing the dyed flame-retardant viscose fiber with the oxidized fiber to prepare a flame-resistant needled felt. The method uses isoparaffin as a continuous phase medium for dyeing to replace water for preparing the reactive dye liquor, achieving a significant reduction in dyeing wastewater; mixing the dyed fiber with the oxidized fiber to prepare a flame-resistant needled felt can solve the problem of the single color of the oxidized fiber.

Description

Technical Field

[0001] The present invention relates to a dyeing method for flame-retardant viscose fibers, and particularly to an oxidized fiber / flame-retardant viscose flame-resistant needle felt and an isoparaffin dyeing method for reactive dyes, belonging to the field of dyeing and finishing technology. Background Art

[0002] Polyacrylonitrile pre-oxidized fiber, abbreviated as pre-oxidized fiber or pre-oxidized yarn, is obtained by high-temperature heat stabilization treatment of polyacrylonitrile fiber. The pre-oxidized fiber has high flame retardancy, with a limiting oxygen index greater than 45%, excellent thermal stability, and does not melt, soften and shrink, or have melt dripping during combustion, belonging to a quasi-incombustible product; it has good heat insulation effect, good resistance to acid and alkali corrosion, chemical environment, and radiation; it has suitable textile processing properties, and the fabric is light, soft, and has good water absorption. However, the oxidized fiber has a single color, generally black.

[0003] Flame-retardant viscose fiber is a phosphoric acid-based flame retardant containing phosphorus and nitrogen flame-retardant elements added to the spinning dope. The flame-retardant viscose fiber is a fiber bundle fiber very similar to cotton, especially in terms of hygroscopicity, heat preservation ability, hand feeling, and natural structure. The flame-retardant viscose fiber can be used as protective clothing, knitted fabrics, and household textiles.

[0004] Reactive dyes are famous for their bright colors, complete chromatograms, simple application, low cost, and excellent fastness. Since their advent, the application range of reactive dyes has been increasingly extensive, and they have become the most important type of dyes for textile dyeing. However, there are generally some problems in the dyeing of reactive dyes, especially the low dye utilization rate, large wastewater discharge, and large amount of electrolyte used for promoting dyeing.

[0005] The parent body of reactive dyes is generally a simple acid or direct dye, with low directivity and low dye uptake rate on fibers. During dyeing, a large amount of neutral electrolyte must be added to promote dyeing to reduce the electrostatic repulsion between the dye and the fiber. The addition of electrolyte can promote the dye uptake and reduce the dye content in the wastewater. However, due to the large amount of electrolyte that cannot be degraded and recycled, it increases the difficulty of sewage treatment and will also cause environmental pollution and damage the ecological balance.

[0006] On the other hand, the low fixation rate and large water consumption of reactive dyes are also what researchers hope to overcome. Reactive dyeing usually uses water as the medium. Although water as the dyeing medium has many advantages, during dyeing, reactive dyes will react with strongly nucleophilic water molecules and hydrolyze, resulting in a decrease in the fixation rate. Therefore, in the wastewater of reactive dyeing, in addition to high-concentration salts, it often contains up to 30%-40% of hydrolyzed dyes, seriously polluting the water source and bringing many ecological problems. Therefore, in view of the above problems, it is of great significance to carry out research and development on new methods and new technologies for reactive dyeing.

[0007] Oxidized fibers have excellent thermal stability. After ignition, the fibers do not melt, do not soften and shrink at high temperatures, and have no melt droplets. They belong to quasi-incombustible products. They have very low thermal conductivity, good heat insulation effect, and can reduce burns caused by the temperature rise of fabrics. They are resistant to acid and alkali corrosion, chemical environments, and radiation. They have suitable textile processing properties. The fabrics are light, soft, and have a moisture absorption similar to cotton. They can be used for pure spinning, blended spinning of various products and industrial materials. However, due to the lack of crimp, high static electricity, smooth fibers, and low strength of this material, spinning is somewhat difficult and the weaving breakage rate is high. Summary of the Invention

[0008] The purpose of the present invention is to provide a method for dyeing oxidized fiber / flame-retardant viscose flame-resistant needle felt with reactive dyes using isoparaffin hydrocarbons. This dyeing method uses isoparaffin hydrocarbons as the continuous phase medium for dyeing, replaces water to prepare the reactive dye solution, and significantly reduces the dyeing wastewater.

[0009] The technical solution adopted by the present invention to solve its technical problems is:

[0010] A method for dyeing oxidized fiber / flame-retardant viscose flame-resistant needle felt with reactive dyes using isoparaffin hydrocarbons, the method comprising the following steps:

[0011] S1. Dye dispersion: Disperse the reactive dye in isoparaffin hydrocarbons;

[0012] S2. Fiber swelling: Put the flame-retardant viscose fiber into the dye solution and make the dye uniformly disperse on the fiber surface;

[0013] S3. Dye dissolution: Add the alkali solution to the dye solution to dissolve the dye;

[0014] S4. Dyeing and fixation: Place the dye solution at 30 - 80 °C for dyeing and fixation;

[0015] S5. Washing: Wash the dyed fiber with water and prepare a soap solution for soaping to obtain the dyed flame-retardant viscose fiber;

[0016] S6. Needling: Mix the dyed flame-retardant viscose fiber with oxidized fiber to make a flame-resistant needle felt.

[0017] Currently, the most widely used carbon fiber is polyacrylonitrile (PAN)-based carbon fiber. Its preparation method involves copolymerizing acrylonitrile and certain monomers to obtain PAN, using a spinning solution containing PAN to obtain PAN nascent fibers through wet spinning, dry spinning, or dry-jet wet spinning, obtaining carbon fiber precursor fibers (also known as carbon fiber raw yarns) through post-treatment, and then pre-oxidizing the carbon fiber raw yarns under the conditions of a temperature of 200-400°C and an oxidizing atmosphere to obtain oxidized fibers (sometimes called oxidized silk, flame-retardant fiber, flame-resistant fiber, pre-oxidized fiber); finally, carbonizing the oxidized fibers under high-temperature conditions (generally greater than 1000°C) and an inert atmosphere, such as treating at a higher temperature (generally greater than 2500°C) and an inert atmosphere, to obtain graphitized carbon fiber. The oxidized fiber described in the present invention is the intermediate product of this process.

[0018] Isoparaffin is a colorless, odorless, transparent oily liquid with 10-20 carbon atoms and no other special groups except methyl and methylene groups. Due to its multi-branched structure, isoparaffin has better spreading properties, low pour point, small odor, low toxicity, good biocompatibility, thermal stability, and oxidation stability, is non-toxic to the human body, safe and environmentally friendly, and has a low price. It can be divided into IPC10, IPC12, IPC13, IPC16, IPC20 (Zhengmao Petrochemical grades) according to the carbon number segment; ISOPAR C, E, G, H, L, M (ExxonMobil grades); IP 1016, 1620, 2028, 2835, CLEAN LX, HX (Idemitsu Kosan grades), etc. There are many grades, and the most commonly used isoparaffins are isododecane (iso-dodecane) and isohexadecane (iso-hexadecane).

[0019] Compared with the traditional method for dyeing reactive dyes on flame-retardant viscose fibers, the dyeing method described in the present invention does not require any dye-promoting salts. With the help of isoparaffin, reactive dyes can quickly dye the flame-retardant viscose fibers and hardly undergo hydrolysis, greatly improving the fixation rate of reactive dyes. Using an alkali solution instead of water to dissolve the dye enables simultaneous dyeing and fixation, reducing the dyeing time. This method not only effectively improves the utilization rate of reactive dyes for dyeing flame-retardant viscose fibers, but also the flame-retardant viscose fibers after dyeing do not require special treatment.

[0020] Preferably, the dosage of the reactive dye is controlled at 1-5% owf, and the bath ratio of the flame-retardant viscose fiber to isoparaffin is controlled at 1:10-1:50. Most preferably, in the preparation of the dyeing solution, the dosage of the reactive dye is 2% owf, and the bath ratio of the fiber to isoparaffin is 1:40.

[0021] Preferably, the reactive dye is one or more of reactive red, reactive yellow, reactive blue, and reactive black.

[0022] Preferably, the lye in S3 is one or more of sodium carbonate, sodium bicarbonate, and sodium hydroxide solutions, and its concentration ranges from 10 to 20 g / L. The best choice is a 14 g / L sodium carbonate solution with a dosage of 2 mL.

[0023] Preferably, the reactive dye is one or more of Novacron Deep Cherry, Novacron Yellow, Novacron Dark Blue, Novacron Bold Navy, and Novacron Super Black.

[0024] Preferably, the time for dyeing and fixing in S4 is 10 - 50 min. The best choice is 30 min.

[0025] Preferably, the method for soaping in S5 is as follows: Prepare a soaping solution with a bath ratio of 1:50, add the dyed flame - retardant viscose fiber, and carry out soaping for 5 - 15 min at 80 - 100 °C. The best choice is 95 °C for 10 min.

[0026] Preferably, the composition of the soaping solution is: 2 g / L standard soap flakes and 2 g / L sodium carbonate.

[0027] Preferably, the needling process in S6 is: weighing → opening → cotton mixing → carding → spinning out → web laying → needling.

[0028] Preferably, the isoparaffin is selected from isoparaffin solvents with C10 - C20, such as one or several of Idemitsu IP SOLVENT2028, Idemitsu IP CLEAN LX, and Idemitsu IP SOLVENT 1620.

[0029] Preferably, the flame - retardant viscose is Lenzing viscose.

[0030] An oxidized fiber / flame - retardant viscose flame - resistant needled felt prepared by the method for dyeing reactive dyes with isoparaffin according to the present invention.

[0031] The method of the present invention uses isoparaffin instead of an aqueous medium to dye flame - retardant viscose fibers with reactive dyes. In this dyeing method, the reactive dye is first dispersed in isoparaffin, and then the fiber is added to the dye solution. After the dye is dissolved with lye, dyeing and fixing are carried out, and finally soaping is done. Reactive dyes are insoluble in isoparaffin, and uneven dispersion easily leads to uneven dyeing. The technical difficulty lies in ensuring the best level dyeing property while reducing the water consumption. The method for dyeing flame - retardant viscose fibers with reactive dyes provided by the present invention does not require neutral salts for promoting dyeing, has a high dye uptake rate and a high fixation rate, and this method greatly reduces the water used for dyeing, reduces wastewater discharge, and has important practical significance for the development of ecological dyeing and finishing.

[0032] The present invention needles after mixing oxidized fiber and flame-retardant viscose fiber. To solve the problems that the oxidized fiber has a single color and is difficult to spin, it is mixed with the flame-retardant viscose fiber and needled to obtain a non-woven needled fabric, which can not only endow the needled fabric with different colors but also avoid the spinning difficulties.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. Since the reactive dye is soluble in water but insoluble in isoparaffin, and the hydrophilic flame-retardant viscose fiber has good affinity for both water and reactive dye, thus in the isoparaffin bath, whether the reactive dye is suspended and dispersed or dissolved in water, it will spontaneously and rapidly adsorb onto the fabric, obtaining a very high dye uptake rate, and no neutral salt is needed for dye promotion. This method effectively solves the problems such as low dye uptake rate of reactive dye, large amount of salt used, and difficult treatment of wastewater.

[0035] 2. Using a small amount of alkali solution to dissolve the reactive dye dispersed in isoparaffin and on the fiber surface can largely inhibit the hydrolysis of the dye, and dyeing and fixation can be carried out simultaneously. Compared with traditional water bath dyeing, the dye fixation rate is significantly improved, and the utilization rate of the dye is greatly increased.

[0036] 3. Compared with water bath dyeing, a good dyeing effect can be achieved with only a small amount of water, which has a significant effect of saving water and reducing wastewater discharge, and conforms to the development direction of ecological dyeing and finishing.

[0037] 4. Mixing the dyed flame-retardant viscose fiber with oxidized fiber to make a flame-resistant needled felt can solve the problem of single color of oxidized fiber. Description of the Drawings

[0038] Figure 1 are the samples (a) dyed in Example 1, the samples (b) dyed in Comparative Example 1, and the samples (c) dyed in Comparative Example 2;

[0039] Figure 2 are the samples (a) dyed in Example 2 and the samples (b) dyed in Comparative Example 3;

[0040] Figure 3 are the samples (a) dyed in Example 3 and the samples (b) dyed in Comparative Example 4;

[0041] Figure 4 are the samples (a) needled in Example 4, the samples (b) dyed, and the samples (c) dyed in Comparative Example 5. Detailed Embodiments

[0042] The technical solution of the present invention will be further specifically described below through specific embodiments. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any formal modification and / or change made to the present invention will fall within the protection scope of the present invention.

[0043] In the present invention, unless otherwise specified, all parts and percentages are in weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are conventional methods in the art unless otherwise specified.

[0044] The flame-retardant viscose fiber in the following examples uses the commercial product Lenzing viscose, purchased from Lenzing Company.

[0045] Example 1:

[0046] An isoparaffin Novacron Deep Cherry dyeing method for flame-retardant viscose fiber, and the specific steps of the method are as follows:

[0047] S1. Dye dispersion: Disperse Novacron Deep Cherry in isoparaffin.

[0048] S2. Fiber swelling: Put the flame-retardant viscose fiber into the dye solution and make the dye uniformly disperse on the fiber surface.

[0049] S3. Dye dissolution: Add the alkali solution to the dye solution to dissolve the dye.

[0050] S4. Dyeing and fixation: Place the dye solution at 60 °C for dyeing and fixation for 30 min.

[0051] S5. Washing: Wash the dyed fiber with water and prepare a soaping solution for soaping to obtain the dyed flame-retardant viscose fiber. The composition of the soaping solution is: 2 g / L standard soap flakes and 2 g / L sodium carbonate (the same below).

[0052] The dyeing formula and conditions in the dyeing method are:

[0053] Novacron Deep Cherry: 2% owf;

[0054] Sodium carbonate concentration: 14 g / L;

[0055] Alkali solution dosage: 2 mL;

[0056] Flame-retardant viscose fiber weight: 1 g;

[0057] Mass ratio of flame-retardant viscose fiber to isoparaffin: 1:40.

[0058] The isoparaffin used in this example is Idemitsu IP SOLVENT 2028, and the specific parameters are as follows:

[0059] Table 1 Related parameters of isoparaffin used in Example 1

[0060]

[0061] The dyed sample is red, see Figure 1 a.

[0062] Comparative Example 1:

[0063] The specific dyeing method and process conditions are the same as those in Example 1, and the isoparaffin in the dyeing medium is replaced with water.

[0064] The dyed sample is red, see Figure 1 b.

[0065] Comparative Example 2:

[0066] The specific dyeing method and process conditions are the same as those in Example 1, and the Idemitsu IP SOLVENT 2028 in the dyeing medium is replaced with Idemitsu IP CLEAN LX. The specific parameters are as follows:

[0067] Table 2 Related parameters of isoparaffin used in Comparative Example 2

[0068]

[0069] The dyed sample is red, see Figure 1 c.

[0070] Table 3 Dyeing properties of Example 1 and Comparative Examples 1 and 2

[0071] Example 1 Comparative Example 1 Comparative Example 2 K / S 20.92 19.20 19.76 Levelness 1.10 1.37 1.43

[0072] In the table, the larger the K / S value, the darker the surface color. The smaller the levelness value, the better the levelness.

[0073] Example 2:

[0074] An isoparaffin Novacron Deep Cherry, Dark Blue, Yellow dyeing method for flame-retardant viscose fiber. The specific steps of the method are as follows:

[0075] S1. Dye dispersion: Disperse Novacron Deep Cherry, Dark Blue, Yellow in isoparaffin;

[0076] S2. Fiber swelling: Put the flame-retardant viscose fiber into the dye solution and make the dye uniformly disperse on the fiber surface;

[0077] S3. Dye dissolution: Add the alkali solution to the dye solution to dissolve the dye;

[0078] S4. Dyeing and fixing: Place the dye solution at 60 °C for dyeing and fixing for 30 min;

[0079] S5, Washing: Wash the dyed fibers and prepare a soap bath for soaping to obtain dyed flame-retardant viscose fibers.

[0080] The dyeing formulation and conditions in the dyeing method are as follows:

[0081] Novacron Deep Cherry: 1% owf;

[0082] Novacron Dark Blue: 1% owf;

[0083] Novacron Yellow: 1% owf;

[0084] Sodium carbonate concentration: 14 g / L;

[0085] Alkali solution dosage: 2 mL;

[0086] Flame-retardant viscose fiber weight: 1 g;

[0087] Mass ratio of flame-retardant viscose fiber to isoparaffin: 1:40.

[0088] The variety of isoparaffin is the same as that in Example 1.

[0089] The dyed sample is brown, as shown in Figure 2 (a).

[0090] Comparative Example 3:

[0091] The specific dyeing method and process conditions are the same as those in Example 2, and the flame-retardant viscose fiber is replaced with cotton fiber.

[0092] The variety of isoparaffin is the same as that in Example 1.

[0093] The dyed sample is brown, as shown in Figure 2 (b).

[0094] Table 3 Dyeing Properties of Example 2 and Comparative Example 3

[0095] Example 2 Comparative Example 3 K / S 13.92 9.32 Levelness 0.45 1.17

[0096] In the table, the larger the K / S value, the darker the surface color. The smaller the levelness value, the better the levelness.

[0097] Example 3:

[0098] An isoparaffin Novacron Yellow dyeing method for flame-retardant viscose fibers, and the specific steps of this method are as follows:

[0099] S1, Dye dispersion: Disperse Novacron Yellow in isoparaffin;

[0100] S2. Fiber swelling: Place the flame-retardant viscose fiber in the dye bath and evenly disperse the dye on the fiber surface;

[0101] S3. Dye dissolution: Add the lye to the dye bath to dissolve the dye;

[0102] S4. Dyeing and fixing: Place the dye bath at 60 °C for dyeing and fixing for 20 min;

[0103] S5. Washing: Wash the dyed fiber with water and prepare a soap bath for soaping to obtain the dyed flame-retardant viscose fiber.

[0104] The dyeing formula and conditions in the dyeing method are as follows:

[0105] Novacron Yellow: 3% owf;

[0106] Sodium carbonate concentration: 14 g / L;

[0107] Lye dosage: 2 mL;

[0108] Flame-retardant viscose fiber weight: 1 g;

[0109] Mass ratio of flame-retardant viscose fiber to isoparaffin: 1:40.

[0110] The variety of isoparaffin is the same as that in Example 1.

[0111] The dyed sample is yellow, see Figure 3 (a).

[0112] Comparative Example 4:

[0113] The specific dyeing method and process conditions are the same as those in Example 3, and the flame-retardant viscose fiber is replaced with viscose fabric.

[0114] The variety of isoparaffin is the same as that in Example 1.

[0115] The dyed sample is yellow, see Figure 3 (b).

[0116] Table 4 Dyeing properties of Example 3 and Comparative Example 4

[0117] Example 3 Comparative Example 4 K / S 19.83 17.05 Levelness 1.27 0.29

[0118] In the table, the larger the K / S value, the deeper the surface color. The smaller the levelness value, the better the levelness.

[0119] Example 4:

[0120] An isoparaffin dyeing method for reactive dyes of oxidized fiber / flame-retardant viscose flame-resistant needle felt, and the specific steps of the method are as follows:

[0121] S1. Dye dispersion: Disperse Novacron Deep Cherry in isoparaffin;

[0122] S2. Swelling of needle-punched felt:

[0123] Mix the dyed flame-retardant viscose fiber and oxidized fiber to make a flame-resistant needle-punched felt. The needle-punching process flow is: weighing → opening → cotton mixing → carding → spinning → web laying → needle punching. The ratio of flame-retardant viscose fiber to oxidized fiber is 1:1. The needle-punched felt sample is shown in Figure 4 (a).

[0124] Put the flame-resistant needle-punched felt into the dye solution and make the dye evenly disperse on the surface of the needle-punched felt;

[0125] S3. Dye dissolution: Add the lye to the dye solution to dissolve the dye;

[0126] S4. Dyeing and fixation: Place the dye solution at 60 °C for dyeing and fixation for 20 min;

[0127] S5. Washing: Wash the dyed needle-punched felt and prepare a soap solution for soaping to obtain the dyed flame-resistant needle-punched felt.

[0128] The dyeing formula and conditions in the dyeing method are:

[0129] Novacron Deep Cherry: 2% owf;

[0130] Sodium carbonate concentration: 14 g / L;

[0131] Lye dosage: 2 mL;

[0132] Flame-resistant needle-punched felt weight: 10 g;

[0133] Ratio of flame-retardant viscose fiber to isoparaffin mass: 1:40.

[0134] The variety of isoparaffin is the same as that in Example 1.

[0135] The dyed sample is red, as shown in Figure 4 (b).

[0136] Comparative Example 5:

[0137] The specific dyeing method and process conditions are the same as those in Example 4, and the dyeing medium isoparaffin is replaced with water.

[0138] The variety of isoparaffin is the same as that in Example 1.

[0139] The dyed sample is red, as shown in Figure 4 (c).

[0140] Conclusion

[0141] It can be seen from Comparative Example 1 that when isoparaffin is used as the dyeing medium, higher color yield and better levelness can be obtained compared with traditional water bath dyeing, and most of the water used to dissolve dyes and swell fibers is saved. It can be seen from Comparative Example 3 that isoparaffin as the dyeing medium is also applicable to the dyeing of cotton fibers, but the dyeing effect is worse than that of flame-retardant viscose fibers.

[0142] Comparative Example 4 shows that when isoparaffin is used as the dyeing medium, not only can loose fibers be dyed, but also excellent dyeing effects can be achieved for fabrics, and it is easier to obtain better levelness for fabrics than for loose fibers. In Example 4, the flame-retardant viscose fibers and oxidized fibers were first mixed to make a needle-punched felt and then dyed. However, due to the tight structure of the needle-punched felt, the dyeing uniformity was poor. Dyeing first and then mixing can make the color more uniform and the prepared needle-punched felt more beautiful.

[0143] In summary, it can be seen from the various figures and experimental results that under the same dyeing method and process conditions, the flame-retardant viscose fibers dyed with isoparaffin as the medium can have a better dye uptake rate and more uniform dyeing, which can also be verified from the dyeing performance values of the various examples and comparative examples. The dyeing method with isoparaffin as the medium is not only applicable to different dyes, but also applicable to different loose fibers and fabrics to achieve good dyeing effects.

[0144] In this specification, the various embodiments are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0145] The above has introduced in detail an active dye isoparaffin dyeing method for an oxidized fiber / flame-retardant viscose flame-resistant needle-punched felt provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for dyeing oxidized fiber / flame-retardant viscose flame-resistant needle felt with reactive dyes in isoparaffin, characterized in that this method comprises the following steps: S1. Dye dispersion: Disperse the reactive dye in isoparaffin to obtain a dye solution; the isoparaffin is Idemitsu IPSOLVENT 2028; S2. Fiber swelling: Put the flame-retardant viscose fiber into the dye solution of S1 and make the dye uniformly disperse on the fiber surface; S3. Dye dissolution: Add an alkali solution to the dye solution to dissolve the dye, the alkali solution is one or several of sodium carbonate, sodium bicarbonate and sodium hydroxide solution, its concentration range is 10 - 20 g / L, and the dosage is 1 - 5 mL; S4. Dyeing and fixation: Place the dye solution at 30 - 80 °C for dyeing and fixation; S5. Washing: Wash the dyed fiber with water and prepare a soaping solution for soaping to obtain the dyed flame-retardant viscose fiber; S6. Needling: Mix the dyed flame-retardant viscose fiber with oxidized fiber and then make a flame-resistant needle felt.

2. The method for dyeing reactive dyes in isoparaffin according to claim 1, characterized in that: The dosage of the reactive dye is controlled at 1 - 5% owf, and the bath ratio of the flame-retardant viscose fiber to isoparaffin is controlled at 1:10 - 1:

50.

3. The method for dyeing reactive dyes in isoparaffin according to claim 1, characterized in that: The reactive dye is one or several of reactive red, reactive yellow, reactive blue, and reactive black.

4. The method for dyeing reactive dyes in isoparaffin according to claim 1, characterized in that: The time for dyeing and fixation in S4 is 10 - 50 min.

5. The method for dyeing reactive dyes in isoparaffin according to claim 1, characterized in that: The method for soaping in S5 is: Prepare a soaping solution with a bath ratio of 1:50, add the dyed flame-retardant viscose fiber, and under the condition of 80 - 100 °C, carry out soaping for 5 - 15 min.

6. The method for dyeing reactive dyes in isoparaffin according to claim 5, characterized in that: The composition of the soaping solution is: 2 g / L standard soap flakes and 2 g / L sodium carbonate.

7. The method for dyeing reactive dyes in isoparaffin according to claim 1, characterized in that: The needling process flow of S6 is: weighing → opening → cotton mixing → carding → spinning out → web laying → needling.

8. The method for dyeing reactive dyes in isoparaffin according to claim 1, characterized in that: The flame-retardant viscose is selected as Lenzing viscose.

9. An oxidized fiber / flame-retardant viscose flame-resistant needle felt prepared by the method for dyeing reactive dyes in isoparaffin according to claim 1.

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