CN117344396A - Preparation method of high-performance flame-retardant artificial viscose fiber - Google Patents

Abstract

The invention belongs to the technical field of viscose fiber. It discloses a preparation method of high-performance flame-retardant artificial viscose fiber, which includes the following steps: S1. Select natural fiber as the raw material for manufacturing viscose fiber; S2. Impregnate the natural fiber and form a slurry. ; S3. Prepare alkali cellulose and reduce the degree of polymerization; S4. Carry out yellowing reaction of alkali cellulose; S5. Dissolve; S6. Filter; S7. Mature; S8. Add antibacterial agents, the antibacterial agents include aloe-emodin, poly Ethylene trimethyl ammonium chloride, acetic acid, potassium persulfate, copper sulfate, sodium bicarbonate, methyl nonyl ketone; S9. Add flame retardant, the flame retardant is a halogen-free flame retardant; S10. Remove Bubble; S11. Spinning.

Description

Preparation method of high-performance flame-retardant artificial viscose fiber

Technical field

The invention belongs to the technical field of viscose fibers, and specifically relates to a preparation method of high-performance flame-retardant artificial viscose fibers.

Background technique

Viscose fiber, referred to as viscose fiber, also known as viscose silk, is a type of man-made fiber. Viscose fiber is the main type of man-made fiber and the second largest chemical fiber type in China. Its main raw material is chemical pulp, including cotton pulp and wood pulp. Natural cellulose is separated and regenerated through chemical reactions. The raw materials used domestically are mainly cotton pulp. Viscose fiber has good hygroscopicity, is easy to dye, is not prone to static electricity, and has good spinnability. It is widely used in various textiles, clothing and other fields. Like most textile fibers, viscose fiber is a flammable substance with an LOI value of only about 18%, making it extremely prone to fire. Moreover, viscose fiber has poor antibacterial properties and cannot hinder the growth, reproduction and activity of bacteria. Today, people's quality of life has been unprecedentedly improved, and people have a greater demand for cleanliness and hygiene. In addition, people's emphasis on life and work safety, especially fire prevention, has also reached a new height.

Contents of the invention

In view of the problems raised by the above background technology, the purpose of the present invention is to provide a method for preparing high-performance flame-retardant artificial viscose fibers.

In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

The preparation method of high-performance flame-retardant artificial viscose fiber includes the following steps:

S1. Use natural fibers as raw materials for making viscose fibers;

S2. Natural fibers are impregnated and formed into pulp;

S3. Prepare alkali cellulose and reduce the degree of polymerization;

S4. Alkaline cellulose undergoes yellowing reaction;

S5. Dissolve;

S6. Filter;

S7. Mature;

S8. Add antibacterial agents, which include aloe-emodin, polyoxyethylene trimethylammonium chloride, acetic acid, potassium persulfate, copper sulfate, sodium bicarbonate, and methyl nonyl ketone;

S9. Add a flame retardant, which is a halogen-free flame retardant;

S10.Degassing;

S11. Spinning.

It is further limited that the natural fiber is wood fiber. This design is because wood fiber has better solubility than cotton cellulose.

It is further limited that the wood fiber is beech fiber. With this design, the beech sulfate pulp decomposes faster during the aging process, which is beneficial to improving the production speed and quality.

It is further limited that the wood fiber is dissolved into pulp and porridge through sulfite cooking. With such a design, lignin and hemicellulose will be dissolved during the cooking process, and when sulfite cooking is used, the sulfate pulp produced Less, sulfate pulp is less crystalline and leaves less residue when yellowed.

It is further limited that when preparing alkali cellulose, 16% to 20% sodium hydroxide solvent is added to the pulp porridge. In this design, using 16% to 20% sodium hydroxide solvent for alkalization has the best effect and the fastest aging speed. It is fast and helps to improve the utilization rate of carbon disulfide during yellowing. Generally speaking, it has good solubility and yellowing properties.

It is further limited that the sodium hydroxide solvent is 18%. This design provides the optimal sodium hydroxide solvent content.

It is further limited that during the yellowing reaction, the alkali cellulose is carried out with carbon disulfide. Such a design completes the yellowing of the alkali cellulose through carbon disulfide and changes the structure of the alkali cellulose.

Further qualification, the flame retardant includes phosphorus oxychloride, phenol and bisphenol A. Such a design does not contain halogen components, which can avoid the decomposition of HX when the halogen flame retardant is heated. HX is a highly corrosive and toxic gases, whose presence has brought great secondary harm to the people trapped in the fire.

It is further limited that during spinning, the content of cellulose in the spinning liquid is 5% to 11%. This design improves the quality of spinning.

Further limit, during spinning, the weight ratio of antibacterial agent to spinning solution is 3 to 5:100, and the weight ratio of flame retardant to spinning solution is 3 to 10:100. This design ensures that the antibacterial agent and flame retardant The appropriate proportion of the agent can achieve good antibacterial and flame retardant effects while avoiding affecting the physical properties of the spun viscose fiber.

The beneficial effects of the present invention: antibacterial agents can inhibit the growth of bacterial flora, hinder bacterial growth and reproduction and suppress activity, meeting users' needs for cleanliness and hygiene, while flame retardants can improve the flame retardant performance of viscose fibers and improve the safety of use. Furthermore, the flame retardant is a halogen-free flame retardant and does not contain halogen components, which can prevent the halogen flame retardant from decomposing HX when heated. HX is a highly corrosive and toxic gas, preventing the presence of HX from causing fire hazards. causing secondary harm to the trapped people.

Description of drawings

The invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

Figure 1 is a flow chart of an embodiment of the preparation method of high-performance flame-retardant artificial viscose fiber of the present invention;

Detailed ways

In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and examples.

As shown in Figure 1, the preparation method of the high-performance flame-retardant artificial viscose fiber of the present invention includes the following steps:

S1. Use natural fibers as raw materials for making viscose fibers;

S2. Natural fibers are impregnated and formed into pulp;

S3. Prepare alkali cellulose and reduce the degree of polymerization;

S4. Alkaline cellulose undergoes yellowing reaction;

S5. Dissolve;

S6. Filter;

S7. Mature;

S8. Add antibacterial agents, which include aloe-emodin, polyoxyethylene trimethylammonium chloride, acetic acid, potassium persulfate, copper sulfate, sodium bicarbonate, and methyl nonyl ketone;

S9. Add flame retardant, which is halogen-free flame retardant;

S10.Degassing;

S11. Spinning.

In this example:

Natural fiber is selected as the raw material for making viscose fiber. Specifically, wood fiber can be used. Compared with cotton cellulose, wood fiber has better solubility. It is more convenient to use beech fiber. The beech sulfate pulp decomposes faster during the aging process. Fast, which is beneficial to improving production speed and quality. Subsequently, the natural fiber is impregnated and dissolved into pulp porridge through sulfite method; alkali cellulose is prepared to reduce the degree of polymerization. During preparation, 16% to 20% sodium hydroxide is added to the pulp porridge. Solvent, alkali cellulose and then add carbon disulfide for yellowing reaction. After the yellowing reaction, it is dissolved, filtered, matured, and antibacterial agents and flame retardants are added. Antibacterial agents can inhibit the growth of bacterial flora, hinder bacterial growth and reproduction, and suppress activity. , to meet users’ needs for cleanliness and hygiene, and flame retardants can improve the flame retardant properties of viscose fibers and improve the safety of use. Furthermore, the flame retardants are halogen-free flame retardants, which do not contain halogen components and can avoid halogen When the flame retardant is heated, it decomposes into HX, which is a highly corrosive and toxic gas. This prevents the presence of HX from causing secondary harm to the people trapped in the fire.

Preferably, the natural fiber is wood fiber. This design is because wood fiber has better solubility than cotton cellulose. In fact, other natural fibers may also be considered on a case-by-case basis.

Preferably, the wood fiber is beech fiber. With this design, the beech sulfate pulp decomposes faster during the aging process, which is beneficial to improving production speed and quality. In fact, other wood fiber types can also be considered on a case-by-case basis.

Preferably, wood fiber is dissolved into pulp and porridge through sulfite cooking. With this design, lignin and hemicellulose will be dissolved during the cooking process, and when sulfite cooking is used, less sulfate pulp is produced. Kraft pulp is less crystalline and leaves less residue when yellowed. In fact, other methods for dissolving lignin and hemicellulose may also be considered based on specific circumstances.

Preferably, when preparing alkali cellulose, 16% to 20% sodium hydroxide solvent is added to the pulp porridge. In this design, using 16% to 20% sodium hydroxide solvent for alkalization has the best effect and the fastest aging speed. , it is helpful to improve the utilization rate of carbon disulfide during yellowing, and generally has good solubility and yellowing properties. In fact, other contents of the sodium hydroxide solvent can also be considered based on specific circumstances.

Preferably, the sodium hydroxide solvent is 18%. This design provides the optimal sodium hydroxide solvent content. In fact, other contents of other sodium hydroxide solvents can also be considered based on specific circumstances.

Preferably, during the yellowing reaction, alkali cellulose reacts with carbon disulfide. In this design, carbon disulfide completes the yellowing of alkali cellulose and changes the structure of alkali cellulose. In fact, other methods of changing the structure of alkali cellulose can also be considered based on specific circumstances.

Preferably, the flame retardant includes phosphorus oxychloride, phenol and bisphenol A. This design does not contain halogen components, which can prevent the halogen flame retardant from decomposing HX when heated. HX is a highly corrosive and toxic substance. Gas, its existence brings great secondary harm to the people trapped in the fire. In fact, other components of the flame retardant can also be considered based on specific circumstances.

Preferably, during spinning, the content of cellulose in the spinning liquid is 5% to 11%. This design improves the quality of spinning. In fact, other proportions of cellulose can also be considered based on specific circumstances.

Preferably, during spinning, the weight ratio of antibacterial agent to spinning solution is 3 to 5:100, and the weight ratio of flame retardant to spinning solution is 3 to 10:100. This design ensures that the antibacterial agent and flame retardant The appropriate proportion can achieve good antibacterial and flame retardant effects while avoiding affecting the physical properties of the spun viscose fiber. In fact, other proportions of antibacterial agents and flame retardants can also be considered based on specific circumstances.

The above embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims (10)

1. The preparation method of the high-performance flame-retardant artificial viscose fiber is characterized by comprising the following steps of: comprising the steps of,

s1, selecting natural fibers as raw materials for manufacturing viscose fibers;

s2, soaking natural fibers and forming pulp porridge;

s3, preparing alkali cellulose, and reducing the polymerization degree;

s4, performing a yellowing reaction on the alkali cellulose;

s5, dissolving;

s6, filtering;

s7, ripening;

s8, adding an antibacterial agent, wherein the antibacterial agent comprises aloeresin, polyoxyethylene trimethyl ammonium chloride, acetic acid, potassium persulfate, copper sulfate, sodium bicarbonate and methyl nonylketone;

s9, adding a flame retardant, wherein the flame retardant is a halogen-free flame retardant;

s10, defoaming;

s11, spinning.

2. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 1, wherein the method comprises the following steps: the natural fibers are wood fibers.

3. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 2, wherein the method comprises the following steps: the wood fibers are beech fibers.

4. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 3, wherein the method comprises the following steps: the wood fiber is steamed and dissolved into pulp porridge by a sulfite method.

5. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 4, wherein the method comprises the following steps: when preparing alkali cellulose, 16% -20% sodium hydroxide solvent is added into the pulp porridge.

6. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 5, wherein the method comprises the following steps: the sodium hydroxide solvent is 18%.

7. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 6, wherein the method comprises the following steps: and in the yellowing reaction, the alkali cellulose and the carbon disulfide are processed.

8. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 7, wherein the method comprises the following steps: the flame retardant comprises phosphorus oxychloride, phenol and bisphenol A.

9. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 8, wherein the method comprises the following steps: during spinning, the content of cellulose in the spinning solution is 5% -11%.

10. The method for preparing the high-performance flame-retardant artificial viscose fiber according to claim 9, wherein the method comprises the following steps: during spinning, the weight ratio of the antibacterial agent to the spinning solution is 3-5: 100, the weight ratio of the flame retardant to the spinning solution is 3-10: 100.