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CN-121992511-A - One-step degumming method for flax fiber based on hot alkali activated peroxydisulfate

CN121992511ACN 121992511 ACN121992511 ACN 121992511ACN-121992511-A

Abstract

The invention discloses a one-step degumming method for flax fibers based on hot alkali activated persulfate, and relates to the technical field of flax fiber treatment. According to the invention, peroxodisulfate is used as an oxidant and alkali metal hydroxide to provide an alkaline environment, a hot alkali synergistic activation system is constructed under a heating condition, and ABTS can be further contained in the activation system so as to promote the activation of peroxodisulfate and improve the generation and utilization efficiency of active species. The invention utilizes heat and alkali to cooperatively activate the persulfate to generate oxidative active species, and combines the hydrolysis of colloid components in alkaline environment to remove non-cellulose components such as lignin, pectin, hemicellulose and the like. The method has simple process flow, does not need to additionally add a metal catalyst, can remove non-cellulose components in the flax crude in one-step treatment, and combines the fiber performance and whiteness improvement.

Inventors

  • ZHANG YANG
  • LI JIYUAN
  • CHEN HONGXIA
  • WANG JUN
  • Shang Qianyu

Assignees

  • 河南平棉纺织集团股份有限公司
  • 天津工业大学

Dates

Publication Date
20260508
Application Date
20260408

Claims (10)

  1. 1. A one-step degumming method for flax fibers based on hot alkali activated peroxydisulfate, which is characterized by comprising the following steps: And (3) placing the flax raw hemp in an aqueous solution containing peroxodisulfate and alkali metal hydroxide, performing thermal reaction at 60-100 ℃, and then washing and drying to obtain degummed flax fibers.
  2. 2. The one-step degumming process for flax fibers based on hot alkali activated peroxydisulfate according to claim 1, wherein said peroxydisulfate is sodium peroxydisulfate and/or potassium peroxydisulfate.
  3. 3. The one-step degumming process for flax fibers based on hot alkali activated peroxydisulfate as claimed in claim 1, wherein said alkali metal hydroxide is sodium hydroxide and/or potassium hydroxide.
  4. 4. The one-step degumming method for flax fibers based on hot alkali activated peroxydisulfate as claimed in claim 1, wherein the molar ratio of alkali metal hydroxide to peroxydisulfate is 5:1-7:1.
  5. 5. The one-step degumming process for flax fibers based on hot alkali activated peroxydisulfate as claimed in claim 1, wherein the molar concentration of said peroxydisulfate in said aqueous solution containing peroxydisulfate and alkali metal hydroxide is 33.6-50.42 mM.
  6. 6. The one-step degumming method for flax fibers based on hot alkali activated peroxydisulfate as claimed in claim 1, wherein the time of the thermal reaction is 2-4 hours.
  7. 7. The one-step degumming method for flax fibers based on hot alkali activated peroxydisulfate as set forth in any one of claims 1 to 6, wherein 2,2' -diazabis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt is further added to the aqueous solution.
  8. 8. The one-step degumming method for flax fibers based on hot alkali activated peroxydisulfate according to claim 7, wherein the molar ratio of the 2,2 '-diazabis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt to peroxydisulfate is 1:5-1:3 based on the 2,2' -diazabis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt equivalent.
  9. 9. The degummed flax fiber obtained by the one-step degumming method of flax fiber based on hot alkali activated peroxydisulfate according to any one of claims 1-8.
  10. 10. Use of degummed flax fiber according to claim 9 for the preparation of a raw material of a spinning degummed flax or biobased composite material.

Description

One-step degumming method for flax fiber based on hot alkali activated peroxydisulfate Technical Field The invention relates to the technical field of flax fiber treatment, in particular to a one-step degumming method for flax fiber based on hot alkali activated peroxydisulfate. Background Flax fiber is a natural cellulosic material with excellent properties, has excellent thermal conductivity, hygroscopicity and antibacterial properties, and has wide application in various fields such as textiles, composite materials, biomedicine and the like. More significantly, the water footprint in the planting process is lower than that of cotton, and the cotton has good carbon sink capacity and accords with the concept of green development. However, about 30% of non-cellulose substances (such as hemicellulose, pectin, lignin, lipid wax and the like) in the flax are tightly wrapped on the surface of cellulose to form compact fiber bundles, so that the downstream processing efficiency is greatly reduced, and the degumming treatment becomes an indispensable key link in the efficient utilization process of flax fibers. Currently, degumming treatment has become a core technical bottleneck restricting the recycling of flax fibers. Common degumming methods include biological degumming, physical degumming and chemical degumming, whereas in industrial practice, traditional alkaline degumming processes remain the dominant technology. However, this method is extremely resource-consuming and cannot realize effective bleaching and decoloring, so it is urgent to develop a more environmentally friendly degumming method. In recent years, oxidative degumming technology has been attracting attention, and related patents have also been explored about oxidant systems, pretreatment modes and process combinations. For example, chinese patent CN114086261a adjusts the oxidation degree by controlling the OPR value to increase the breaking strength of the degummed ramie, CN119877272B proposes an oxidative degumming method of oxalic acid pretreatment in cooperation with self-generated peroxyacetic acid to avoid pollution by chlorine-containing oxidants, CN115233319B designs a process of flax selective oxidation and alkali boiling one-bath degumming to reduce water consumption, and CN114411270a adopts low-temperature + high-temperature two-stage oxidative degumming and is assisted with reduction treatment to increase the fiber performance. Although the method can improve the degumming effect or the fiber performance of the flax fiber to a certain extent, the problems of complex flow, more auxiliary agents or catalyst types, insufficient cooperative removal of various colloid components and the like still exist in different degrees. In view of this, the present invention has been proposed. Disclosure of Invention The invention aims to provide a one-step degumming method for flax fibers based on hot alkali activated persulfate so as to realize effective removal of non-cellulose components in flax raw hemp and give consideration to fiber properties. In order to achieve the above object, the present invention provides the following solutions: the invention provides a one-step degumming method of flax fiber based on hot alkali activated persulfate, which comprises the following steps: and (3) placing the flax raw hemp in an aqueous solution (TA-PDS) containing Peroxodisulfate (PDS) and alkali metal hydroxide, performing thermal reaction at 60-100 ℃, and then washing and drying to obtain degummed flax fibers. As a further preferred aspect of the present invention, the peroxodisulfate is sodium peroxodisulfate and/or potassium peroxodisulfate. As a further preferred aspect of the present invention, the alkali metal hydroxide is sodium hydroxide and/or potassium hydroxide. The invention uses peroxodisulfate as oxidant and alkali metal hydroxide to provide alkaline environment, so as to construct a thermoalkali activation system. In the system, hydroxide ions (OH-) generated by dissociation of alkali metal hydroxide efficiently activate peroxodisulfate under the heating condition to generate oxidative free radicals in situ. FIG. 4 shows that the oxidative active species generated in the hot alkali activated peroxydisulfate system is beneficial in promoting the degradation of non-cellulosic components such as lignin. Meanwhile, the alkaline medium is favorable for hydrolysis and depolymerization of pectin, hemicellulose, partial lignin and other colloid components. The oxidation and alkaline hydrolysis cooperate to facilitate the removal of lignin, pectin, hemicellulose and other non-cellulose components in the flax, thereby realizing one-step degumming and improving the whiteness of the fibers. According to the invention, the oxidation and alkaline strength of the reaction system can be regulated by regulating the ratio of the alkali metal hydroxide to the peroxodisulfate, so that the removal of non-cellulose components is promoted and the retention of