Preparation method of antibacterial yarn

Abstract

The invention relates to a preparation method of antibacterial yarn. The yarn produced by the invention is the yarn containing the linen fiber, and when the linen fiber is subjected to alkali treatment, the treatment waste liquid is filtered to obtain lignin mixed filtrate; adding medium-chain diamine and formaldehyde into the lignin mixed filtrate, boiling and keeping the temperature for a period of time to obtain an amino lignin mixed solution, adding enough monobasic saturated alcohol until the reaction is complete, filtering, collecting precipitate, and drying to obtain a medium-chain amino lignin antibacterial agent; and immersing the spun yarn into an antibacterial solution containing medium-chain amino lignin, and airing or drying to obtain the antibacterial yarn. The waste liquid generated in the alkali treatment process of the linen fiber yarn is recycled, and the chain amino lignin antibacterial agent with the antibacterial effect is extracted from the waste liquid and is applied to antibacterial treatment of the yarn again, so that the linen fiber yarn has a certain antibacterial effect.

Description

Technical Field

[0001] The invention relates to a method for preparing yarn, in particular to a method for preparing antibacterial yarn. Background Art

[0002] Fabrics made of either chemical or natural fibers are prone to microorganisms. The following are some common types of bacteria that are prone to grow on fabrics: Staphylococcus aureus, which is a common pathogen that can cause suppurative infection, visceral inflammation, abdominal pain, diarrhea, food poisoning, etc. Staphylococcus aureus often parasitizes on the skin, nasal cavity, throat, stomach and other parts of humans and animals, and is also easy to survive on fabrics, especially in a humid and warm environment; Escherichia coli, Escherichia coli mostly lives in the intestines of animals, but under certain conditions can cause gastrointestinal infections or urethra and other local tissue and organ infections in humans and many animals. Escherichia coli is also easy to grow on fabrics, especially when the fabrics come into contact with contaminated food, water or human secretions; Candida albicans, which usually exists in the normal human oral cavity, upper respiratory tract, intestines and urinary system, mainly causing urinary system infections; mold, mold is a type of fungus, which is easy to grow in a humid, warm and poorly ventilated environment.

[0003] In order to improve the situation of bacterial growth on fabrics, people began to study the antibacterial process of fabrics. According to the source of the antibacterial effect of fabrics, they are divided into exogenous antibacterial fabrics and endogenous antibacterial fabrics. Among them, exogenous antibacterial fabrics generally refer to fabrics with added antibacterial agents. The antibacterial components in antibacterial fabrics are diverse. According to their sources and properties, they can be divided into three categories: inorganic antibacterial agents, organic antibacterial agents and natural antibacterial agents. Endogenous antibacterial fabrics are mainly divided into: silver ion antibacterial fabrics, which use spinning-level antibacterial technology to directly add silver ion antibacterial agents to chemical fibers to make fabrics with long-lasting antibacterial properties; natural fiber antibacterial fabrics, such as hemp fibers and bamboo fibers, which have natural antibacterial properties and can effectively inhibit the growth of bacteria; regenerated fiber antibacterial fabrics, such as chitosan fibers and bamboo viscose fibers, which are treated with special processes to give them antibacterial properties. The antibacterial time of endogenous antibacterial fabrics is significantly higher than that of exogenous antibacterial fabrics.

[0004] Although the antibacterial effect of antibacterial fabrics with added antibacterial agents is shorter than that of endogenous antibacterial fabrics, the latter are limited by the limitations of antibacterial materials, the antibacterial range and fabric materials are limited, and the production process is relatively complicated. Therefore, most antibacterial fabrics on the market achieve antibacterial effects by adding antibacterial agents.

[0005] In the textile industry, during the production of yarns made of plant fiber materials, some plant fibers (such as hemp fibers) are subjected to lignin decomposition treatment. The presence of lignin may affect the softness, glossiness and spinnability of the fiber, so it is necessary to remove part of the lignin through chemical or physical methods to improve the performance of the fiber.

[0006] At the same time, lignin contains abundant active groups such as benzene ring structure, aliphatic and aromatic hydroxyl groups. The presence of these active groups makes lignin have antioxidant, anti-ultraviolet properties and certain antibacterial activity. Studies have shown that lignin has a certain antibacterial effect on plant pathogens and can be used as a new type of plant antibacterial drug or as a food packaging material. The use of lignin as an antibacterial agent has received widespread attention in the field of lignin research, and a large number of new antibacterial functional materials based on lignin have been designed.

[0007] Therefore, if the lignin that is used as waste in the yarn production process can be reused and used in the antibacterial treatment of yarn, this will not only save the cost of antibacterial agents, but also enable waste recycling, which is in line with the concept of sustainable development. Summary of the invention

[0008] The invention provides a method for preparing antibacterial yarn, which solves the problem in the prior art that a large amount of lignin is not utilized in the production process of plant fiber yarn.

[0009] The above technical problem of the present invention is mainly solved by the following technical scheme: a method for preparing antibacterial yarn, wherein the yarn produced by the present invention is a yarn containing flax fiber, comprising the following steps: S1, preparing flax raw materials, removing seeds from the flax raw materials, and then retting the flax raw materials to obtain a semi-finished product A;

[0010] S2, washing the semi-finished product A with water, and then performing alkali treatment (scouring) to obtain the semi-finished product B and the treated waste liquid, filtering the treated waste liquid to obtain a lignin mixed filtrate;

[0011] S3, bleaching the semi-finished product B (sodium hypochlorite / hydrogen peroxide), and washing with water to obtain the semi-finished product C; adding an appropriate amount of water to dilute the lignin mixed filtrate, and adding medium-chain diamine and formaldehyde, boiling and keeping warm for a period of time to obtain an amino lignin mixed solution;

[0012] S4, acid-washing and drying the semi-finished product C to obtain flax fiber; introducing an acidic substance into the amino lignin mixed solution to adjust the pH value to neutral, adding a sufficient amount of monohydric saturated alcohol until the reaction is complete, filtering and collecting the precipitate, and drying to obtain a medium-chain amino lignin antibacterial agent;

[0013] S5, performing a cleaning process on the flax fibers, mixing other types of fibers in proportion, removing some impurities, and mixing them evenly; adding water to the medium-chain amino lignin antibacterial agent to prepare an antibacterial liquid;

[0014] S6, carding: use a carding machine to loosen the flax fiber or mixed fiber into a single strand, remove short fibers and impurities, and make uniform slivers;

[0015] S7, drawing: multiple slivers are combined by a drawing frame, and the slivers are drawn by rollers to improve their uniformity and mix them evenly;

[0016] S8, roving: the cotton strips are drawn out and thinned into roving by a roving machine, and a certain degree of twist is added to increase the strength;

[0017] S9, spun yarn: the spun yarn is further drafted to the required fineness by a spun yarn frame, and sufficient twist is added to firmly establish the longitudinal connection between the fibers, forming a spun yarn with certain strength, elasticity and luster;

[0018] S10, immersing the spun yarn in the antibacterial liquid, taking it out after immersing for a period of time, and air-drying or baking to obtain the antibacterial yarn.

[0019] Further, in S3, the pH value of the solution is adjusted to 10 to 12 by adding water to the lignin mixed filtrate.

[0020] Further, in the mixed solution of S3, the mass percentage of the medium-chain diamine is 5 to 10 wt %, and the mass percentage of formaldehyde is 5 to 10 wt %;

[0021] Further, boiling and keeping warm for 0.5 to 6 hours in S3 to obtain an amino lignin solution;

[0022] Further, in S4, the amino lignin mixed solution is neutralized with acid or carbon dioxide until the pH value is 6 to 7.

[0023] Furthermore, the medium-chain diamine is selected from at least one of propylene diamine, butylene diamine, pentylene diamine and hexylene diamine.

[0024] Furthermore, the monohydric saturated alcohol is selected from at least one of methanol, ethanol, propanol or isopropanol.

[0025] Furthermore, the concentration of the amino lignin antibacterial solution in S5 is 0.6 to 1.4 mg / mL.

[0026] Further, in S10, the yarn is immersed in the antibacterial liquid for 1 to 4 hours.

[0027] Therefore, compared with the prior art, the present invention has the following characteristics: 1. The present invention reuses the waste liquid generated during the alkali treatment of flax fiber yarn, extracts the chain amino lignin antibacterial agent with antibacterial effect from it, and re-applies it to the antibacterial treatment of the yarn, so that the present invention has a certain antibacterial effect. During the production process, the production cost required for the antibacterial treatment is also lower, and it is more competitive in the market; 2. The chain amino lignin antibacterial agent has an obvious bactericidal effect on Staphylococcus aureus and Escherichia coli. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further specifically described below through embodiments.

[0029] Embodiment 1: A method for preparing an antibacterial yarn, wherein the yarn produced by the present invention is a yarn containing flax fibers, comprising the following steps: S1, preparing flax raw materials, removing seeds from the flax raw materials, and then retting the flax raw materials to obtain a semi-finished product A;

[0030] S2, washing the semi-finished product A with water, and then performing alkali treatment (scouring) to obtain the semi-finished product B and the treated waste liquid, filtering the treated waste liquid to obtain a lignin mixed filtrate;

[0031] S3, bleaching the semi-finished product B with a sodium hypochlorite solution, and washing with water to obtain a semi-finished product C; adding an appropriate amount of water to dilute the lignin mixed filtrate, adjusting the pH value to 11, and adding 8wt% of propylenediamine and 8wt% of formaldehyde, boiling and keeping warm for 2 to 3 hours to obtain an amino lignin mixed solution;

[0032] S4, pickling (hydrochloric acid) the semi-finished product C and drying it to obtain flax fiber; introducing an acidic substance into the amino lignin mixed solution to adjust the pH value to neutral, the acidic substance is the pickling waste liquid of the semi-finished product C, adding a sufficient amount of propanol until the reaction is complete, filtering and collecting the precipitate, and drying to obtain a medium-chain amino lignin antibacterial agent;

[0033] S5, performing a cotton cleaning process on the flax fiber, and other types of fibers may be mixed in proportion, removing some impurities, and mixing them evenly; adding water to the medium-chain amino lignin antibacterial agent to prepare an antibacterial liquid with a concentration of 0.8 mg / mL;

[0034] S6, carding: use a carding machine to loosen the flax fiber or mixed fiber into a single strand, remove short fibers and impurities, and make uniform slivers;

[0035] S7, drawing: multiple slivers are combined by a drawing frame, and the slivers are drawn by rollers to improve their uniformity and mix them evenly;

[0036] S8, roving: the cotton strips are drawn out and thinned into roving by a roving machine, and a certain degree of twist is added to increase the strength;

[0037] S9, spun yarn: the spun yarn is further drafted to the required fineness by a spun yarn frame, and sufficient twist is added to firmly establish the longitudinal connection between the fibers, forming a spun yarn with certain strength, elasticity and luster;

[0038] S10, immersing the spun yarn in the antibacterial liquid, taking it out after immersion for 3 hours, and air-drying or baking it to obtain the antibacterial yarn.

[0039] Embodiment 2: A method for preparing an antibacterial yarn, wherein the yarn produced by the present invention is a yarn containing flax fibers, comprising the following steps: S1, preparing flax raw materials, removing seeds from the flax raw materials, and then retting the flax raw materials to obtain a semi-finished product A;

[0040] S2, washing the semi-finished product A with water, and then performing alkali treatment (scouring) to obtain the semi-finished product B and the treated waste liquid, filtering the treated waste liquid to obtain a lignin mixed filtrate;

[0041] S3, bleaching the semi-finished product B with a sodium hypochlorite solution, and washing with water to obtain a semi-finished product C; adding an appropriate amount of water to dilute the lignin mixed filtrate, adjusting the pH value to 11, and adding 8wt% of propylenediamine and 8wt% of formaldehyde, boiling and keeping warm for 2 to 3 hours to obtain an amino lignin mixed solution;

[0042] S4, pickling (hydrochloric acid) the semi-finished product C and drying it to obtain flax fiber; introducing an acidic substance into the amino lignin mixed solution to adjust the pH value to neutral, the acidic substance is the pickling waste liquid of the semi-finished product C, adding a sufficient amount of propanol until the reaction is complete, filtering and collecting the precipitate, and drying to obtain a medium-chain amino lignin antibacterial agent;

[0043] S5, performing a cotton cleaning process on the flax fiber, and other types of fibers may be mixed in proportion, removing some impurities, and mixing them evenly; adding water to the medium-chain amino lignin antibacterial agent to prepare an antibacterial liquid with a concentration of 1.2 mg / mL;

[0044] S6, carding: use a carding machine to loosen the flax fiber or mixed fiber into a single strand, remove short fibers and impurities, and make uniform slivers;

[0045] S7, drawing: multiple slivers are combined by a drawing frame, and the slivers are drawn by rollers to improve their uniformity and mix them evenly;

[0046] S8, roving: the cotton strips are drawn out and thinned into roving by a roving machine, and a certain degree of twist is added to increase the strength;

[0047] S9, spun yarn: the spun yarn is further drafted to the required fineness by a spun yarn frame, and sufficient twist is added to firmly establish the longitudinal connection between the fibers, forming a spun yarn with certain strength, elasticity and luster;

[0048] S10, immersing the spun yarn in the antibacterial liquid, taking it out after immersion for 2 hours, and air-drying or baking to obtain the antibacterial yarn.

[0049] The present invention can be modified in various ways which are obvious to those skilled in the art, and such modifications are not considered to depart from the scope of the present invention. All such modifications which are obvious to those skilled in the art are intended to be included within the scope of the present claims.

Claims

1. A method for preparing an antibacterial yarn, characterized in that: The following steps are involved: S1, preparing flax raw materials, removing seeds from the flax raw materials, and then retting the flax raw materials to obtain a semi-finished product A; S2, washing the semi-finished product A with water, and then performing an alkali treatment to obtain a semi-finished product B and a treated waste liquid, and filtering the treated waste liquid to obtain a lignin mixed filtrate; S3, bleaching the semi-finished product B and washing it with water to obtain a semi-finished product C; adding an appropriate amount of water to dilute the lignin mixed filtrate, adding a medium-chain diamine and formaldehyde, boiling and keeping warm for a period of time to obtain an amino lignin mixed solution; S4, acid-washing and drying the semi-finished product C to obtain flax fiber; introducing an acidic substance into the amino lignin mixed solution to adjust the pH value to neutral, adding a sufficient amount of monohydric saturated alcohol until the reaction is complete, filtering and collecting the precipitate, and drying to obtain a medium-chain amino lignin antibacterial agent; S5, performing a cleaning process on the flax fibers, mixing other types of fibers in proportion, removing some impurities, and mixing them evenly; adding water to the medium-chain amino lignin antibacterial agent to prepare an antibacterial liquid; S6, carding: use a carding machine to loosen the flax fiber or mixed fiber into a single strand, remove short fibers and impurities, and make uniform slivers; S7, drawing: multiple slivers are combined by a drawing frame, and the slivers are drawn by rollers to improve their uniformity and mix them evenly; S8, roving: the cotton strips are drawn out and thinned into roving by a roving machine, and a certain degree of twist is added to increase the strength; S9, spun yarn: the spun yarn is further drafted to the required fineness by a spun yarn frame, and sufficient twist is added to firmly establish the longitudinal connection between the fibers, forming a spun yarn with certain strength, elasticity and luster; S10, immersing the spun yarn in the antibacterial liquid, taking it out after immersing for a period of time, and air-drying or baking it to obtain the antibacterial yarn.

2. The method for preparing antibacterial yarn according to claim 1, characterized in that: In S3, the pH value of the solution is adjusted to 10 to 12 by adding water to the lignin mixed filtrate.

3. The method for preparing antibacterial yarn according to claim 2, characterized in that: In the mixed solution of S3, the mass percentage of the medium-chain diamine is 5 to 10 wt %, and the mass percentage of formaldehyde is 5 to 10 wt %.

4. The method for preparing antibacterial yarn according to claim 3, characterized in that: S3 is boiled and kept warm for 0.5 to 6 hours to obtain an amino lignin solution.

5. The method for preparing antibacterial yarn according to claim 1, characterized in that: In S4, the amino lignin mixed solution is neutralized with acid or carbon dioxide until the pH value is 6 to 7.

6. The method for preparing antibacterial yarn according to claim 3, characterized in that: The medium-chain diamine is selected from at least one of propylene diamine, butylene diamine, pentylene diamine and hexylene diamine.

7. The method for preparing antibacterial yarn according to claim 1, characterized in that: The monohydric saturated alcohol is selected from at least one of methanol, ethanol, propanol or isopropanol.

8. The method for preparing antibacterial yarn according to claim 1, characterized in that: The concentration of the amino lignin antibacterial solution in S5 was 0.6 to 1.4 mg / mL.