Search

CN-122013443-A - Preparation method of non-woven fabric by using chitosan to strengthen chemical bonding method and non-woven fabric prepared by method

CN122013443ACN 122013443 ACN122013443 ACN 122013443ACN-122013443-A

Abstract

The application belongs to the technical field of non-woven fabrics, and discloses a preparation method of a non-woven fabric by using chitosan to strengthen the strength, which comprises the steps of preparing a fiber raw material consisting of main body fibers and chitosan fibers, respectively and uniformly mixing the main body fibers and the chitosan fibers after opening, and carding to form a uniform fiber web; the preparation method comprises the steps of preparing a non-woven fabric, applying anionic acrylic latex to a fiber web, drying and hot-rolling the fiber web to enable the latex to be self-crosslinked, forming an ionic bonding and chemical crosslinking double-crosslinked structure by anionic groups of the latex and chitosan fiber cationic active groups, and cooling, trimming and winding the non-woven fabric. The application adopts a double crosslinking structure of latex self-crosslinking and ionic bonding/chemical crosslinking, and the latex can be crosslinked to form a network by the targeted collocation of the anionic acrylic latex and chitosan fiber, and form stable ionic bonding and/or chemical crosslinking with cationic fiber, thereby greatly strengthening the bonding force between the fibers and solving the problem of insufficient strength of the traditional non-woven fabric.

Inventors

  • JIN HAIMING
  • LIU LANXI
  • CHEN ZEXIANG
  • WANG HONG

Assignees

  • 青岛健康海洋生物制药有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The preparation method of the chemical bonding non-woven fabric with the chitosan for enhancing the strength is characterized by comprising the following steps of: preparing a fiber raw material consisting of main body fibers and chitosan fibers, wherein the main body fibers account for 80% -99.5% of the total weight of the fiber raw material, and the deacetylation degree of the chitosan fibers is 40% -95%; respectively opening the main body fiber and the chitosan fiber, uniformly mixing, and carding to form a uniform fiber web; Drying and hot rolling the fiber web to form a double cross-linking structure with the latex self-crosslinked and the anionic groups and the chitosan fiber cationic active groups forming ionic bonding and chemical cross-linking; cooling, trimming and winding to obtain the non-woven fabric.
  2. 2. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein the chitosan fiber is one of a quaternary ammonium salt modified chitosan fiber, a hydroxylation modified chitosan fiber or a carboxymethyl chitosan fiber with cationic activity, and the main body fiber is any one or more of a cellulose fiber, a modified cellulose fiber, a polyester fiber, an ES fiber, a PBS fiber, a PLA fiber, a polyester staple fiber, a cotton fiber, a polypropylene fiber, a viscose fiber, an aramid 1414 chopped fiber and a lyocell fiber.
  3. 3. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein the mixing proportion of chitosan fiber is 2.5% -8% of the total weight of the fiber raw material.
  4. 4. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein the solid content of the anionic acrylic latex is 15% -50%.
  5. 5. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein the temperature of the drying and hot rolling treatment is 120-180 ℃ for 3-20 minutes.
  6. 6. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein the non-woven fabric is internally provided with a double cross-linking structure formed by latex self-crosslinking and latex-chitosan fiber ionic bonding/chemical crosslinking, the dry transverse strength is more than or equal to 20.3N/SCM, and the wet transverse strength is more than or equal to 13.7N/SCM.
  7. 7. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein in the process of applying anionic acrylic latex to a fiber web, an ultrasonic assisted polymerization technology is utilized, the ultrasonic frequency is controlled to be 20-40kHz, the power is 500-1000W, the uniform dispersion of acrylate monomers in the anionic acrylic latex is promoted, and the reaction of the latex and chitosan fibers is accelerated.
  8. 8. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 1, wherein the pressure of the hot rolling treatment is controlled to be 0.4-0.8MPa, the hot rolling speed is synchronous with the conveying speed of the fiber web, and the difference between the drying temperature and the hot rolling temperature is controlled to be 10-20 ℃, so that the double cross-linking reaction is ensured to be fully carried out.
  9. 9. The method for preparing a non-woven fabric by using chitosan to strengthen strength according to claim 8, wherein hot rolling temperature parameters are adjusted according to latex solid content and fiber web gram weight, the hot rolling temperature is controlled to be 140-170 ℃, and the drying and hot rolling treatment adopts a mode of combining hot air drying and hot rolling, wherein main fibers with poor heat resistance correspond to the hot rolling temperature of 140-150 ℃, and main fibers with strong heat resistance correspond to the hot rolling temperature of 160-170 ℃.
  10. 10. A chemically bonded nonwoven fabric with chitosan-based strength according to claim 1 or 2, characterized in that the fibrous raw material comprises chitosan fibers.

Description

Preparation method of non-woven fabric by using chitosan to strengthen chemical bonding method and non-woven fabric prepared by method Technical Field The application relates to the technical field of non-woven fabrics, in particular to a preparation method of a non-woven fabric by a chemical bonding method by utilizing chitosan to strengthen strength. Background In the field of preparation of non-woven fabrics, chemical bonding methods are widely applied due to their unique properties and various application scenarios, especially in the fields of medical care, industrial filtration, civil engineering, agriculture, household and the like. Currently, the chemical bonding method of the nonwoven fabric generally employs a method of impregnating, spraying or foam coating with an adhesive, applying the adhesive to a fiber web, and then curing the adhesive through a drying, baking or the like process, thereby achieving bonding between fibers. The binders commonly used are mainly acrylates, which form polymeric films mainly by self-crosslinking reactions, thereby bonding the fibers together. However, the conventional method for preparing the non-woven fabric by the chemical bonding method has certain limitations in terms of strength, bonding fastness, environmental protection or production efficiency. First, the forces between the existing binders and the fibers are mostly physical entanglement or hydrogen bonding, which results in possibly limited adhesive strength, and performance degradation easily occurs under specific use environments (e.g., wet heat conditions), so that the adhesive strength and durability of the nonwoven fabric are insufficient to meet high-strength application requirements. Second, in the conventional chemical bonding process, the affinity of the binder to the fibers is poor, resulting in uneven bonding. The fibers used in the traditional chemical bonding process are mostly hydrophilic fiber materials such as viscose fibers, the fibers are water-absorbed and expanded after encountering moisture in acrylic emulsion in the sizing process, and are dehydrated and contracted in the drying process, and the physical form of the fibers is changed in a swelling and shrinking manner, so that the fibers cannot be uniformly covered in the early sizing process, and a large amount of relative displacement occurs between the fibers in the dehydration and drying process in the later stage due to dehydration and contraction, so that the adhesion points between the fibers are damaged, and the consistency of the overall performance of the non-woven fabric is further influenced. Finally, as the non-woven fabrics are combed by a chemical bonding method, the fibers are mostly arranged in the radial direction, the transverse tension of the non-woven fabrics is maintained mainly by the property of the adhesive, so that the radial tension and transverse tension data of finished products of the non-woven fabrics are very large in difference, and the non-woven fabrics are damaged due to insufficient transverse tension, so that the finished products become industry pain points. These technical problems and technical gaps limit the application of chemical bonding nonwoven fabrics in a wider and more demanding field. Cationic fibers have been used in a variety of nonwoven manufacturing processes, and are mainly characterized in that 1, as a functional component, they are mainly used for dyeing and appearance, and can exhibit distinct colors in the same dyeing process due to their different affinities for dyes. This is the most direct and primary use of cationic fibers. 2. As the identification fiber. Under a specific on-line monitoring system (such as a camera and a sensor), normal products mixed with cationic fibers can present a background signal, and defects (such as non-uniformly mixed lumps) formed by the base materials can be easily identified and automatically removed by the system due to lack of the signal. This greatly improves the quality and efficiency of production. However, the application of the cationic fiber is limited to the manufacturing processes of hydroentanglement, needling, spunbonding and the like, but not the production of non-woven fabrics by a chemical bonding method. Cationic fibers (such as conventional cationic dyeable polyester) cannot function in traditional chemical bonding because the cationic groups are shielded due to the latex environment (anionicity). Therefore, there is no precedent for the use of cationic fibers in chemically bonded nonwoven products. In view of this, we propose a method for preparing a non-woven fabric by chemical bonding method using chitosan to enhance strength. Disclosure of Invention 1. The technical problem to be solved. The application aims to provide a preparation method of a chemical bonding non-woven fabric with chitosan for enhancing strength, which solves the technical problems in the prior art, realizes a double cross-linking structure of self cross-