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CN-122013519-A - Preparation method of high-modulus regenerated viscose composite fabric

CN122013519ACN 122013519 ACN122013519 ACN 122013519ACN-122013519-A

Abstract

The invention discloses a preparation method of a high-modulus regenerated viscose fiber composite fabric, which comprises the following steps of S1, selecting regenerated viscose staple fibers, soaking the regenerated viscose staple fibers in deionized water, drying and carding to obtain uniformly dispersed regenerated viscose fibers, S2, soaking the uniformly dispersed regenerated viscose fibers in a cellulose nanocrystalline aqueous dispersion liquid, taking out the cellulose nanocrystalline aqueous dispersion liquid, pre-drying the cellulose nanocrystalline aqueous dispersion liquid, S3, respectively soaking the regenerated viscose fibers in the solution in sequence to form a coating, dehydrating, drying and solidifying the coating to obtain modified regenerated viscose fibers, S4, mixing the modified regenerated viscose fibers with the high-modulus polyester staple fibers, preparing blended yarns after cotton blending, weaving to obtain a primary composite fabric, and S5, carrying out hot rolling compounding, shaping treatment and washing and drying on the primary composite fabric to obtain the high-modulus regenerated viscose fiber composite fabric. The preparation method has the advantages of solving the problems of low modulus, poor interface combination, unstable performance and the like of the fabric, and simultaneously taking the environmental protection and practicability into consideration.

Inventors

  • CHEN YU
  • WU XINLING

Assignees

  • 凯盛家纺股份有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. The preparation method of the high-modulus regenerated viscose composite fabric is characterized by comprising the following steps of: S1, selecting regenerated viscose staple fibers, soaking the regenerated viscose staple fibers in deionized water, then placing the regenerated viscose staple fibers in an oven for drying until the moisture content of the fibers is reduced to 8-10%, and carding to obtain uniformly-dispersed regenerated viscose fibers; s2, soaking the uniformly dispersed regenerated viscose fibers in the cellulose nanocrystalline aqueous dispersion liquid, performing treatment under the assistance of ultrasonic waves, taking out and performing pre-drying; S3, respectively and sequentially dipping the regenerated viscose fibers treated in the step S2 into a solution containing a waterborne polyurethane prepolymer and a chain extender and a silane coupling agent, carrying out in-situ interfacial polymerization reaction, and dehydrating, drying and curing to obtain modified regenerated viscose fibers after a coating is formed; S4, mixing the modified regenerated viscose fibers with high-modulus polyester staple fibers, sequentially carding, drawing, roving and spinning after cotton mixing to prepare blended yarns, and weaving by an air jet loom to obtain a primary-made composite fabric; s5, carrying out hot rolling compounding, shaping treatment and washing drying on the primary composite fabric to obtain the high-modulus regenerated viscose composite fabric.
  2. 2. The method for preparing the high-modulus regenerated viscose fiber composite fabric according to claim 1, wherein the fineness of the regenerated viscose staple fiber in the step S1 is 1.2-1.5 dtex, the length is 38-42 mm, the soaking temperature of deionized water is 25-30 ℃, the soaking time is 20-30 min, the drying temperature of an oven is 80-85 ℃, and the drying time is 2-3 h.
  3. 3. The method for preparing the high-modulus regenerated viscose fiber composite fabric, which is characterized in that the preparation method of the cellulose nanocrystalline aqueous dispersion in the step S2 is characterized in that microcrystalline cellulose is added into a sulfuric acid solution with the concentration of 60-65wt%, acidolysis is carried out for 60-90 min at the temperature of 45-50 ℃, then centrifugation and dialysis are carried out to neutrality, so that the cellulose nanocrystalline aqueous dispersion with the mass fraction of 1-3wt% is obtained, and the bath ratio of the regenerated viscose staple fiber in the cellulose nanocrystalline aqueous dispersion is 1:20-1:30.
  4. 4. The method for preparing the high-modulus regenerated viscose composite fabric according to claim 1, wherein the ultrasonic treatment power in the step S2 is 250-350W, the time is 20-40 min, the pre-drying temperature is 80 ℃, and the pre-drying time is 5-7 min.
  5. 5. The method for preparing the high-modulus regenerated viscose fiber composite fabric according to claim 1, wherein the solid content of the aqueous polyurethane prepolymer in the step S3 is 40%, and the regenerated viscose fiber is immersed in the aqueous polyurethane prepolymer, and the two padding and the rolling residual rate are 80%.
  6. 6. The method for preparing the high-modulus regenerated viscose fiber composite fabric according to claim 1, wherein the solution containing the chain extender and the silane coupling agent in the step S3 is an aqueous solution containing 1wt% of ethylenediamine and 0.5wt% of KH-550, and the regenerated viscose fiber is immersed in the solution containing the chain extender and the silane coupling agent and reacts for 10-15 min at 50 ℃.
  7. 7. The method for preparing the high-modulus regenerated viscose fiber composite fabric according to claim 1, wherein the dehydration rotating speed in the step S3 is 2000-2500 r/min, the dehydration time is 5-8 min, and the specific steps of drying and curing are that pre-drying is carried out for 30-40 min at 90-95 ℃, then heating to 110-120 ℃, and heat preservation and curing are carried out for 2-2.5 h.
  8. 8. The preparation method of the high-modulus regenerated viscose fiber composite fabric according to claim 1 is characterized in that the mass ratio of the modified regenerated viscose fiber to the high-modulus polyester staple fiber in the step S4 is 70:30, the fineness of the high-modulus polyester staple fiber is 1.0-1.2 dtex, the length is 35-38 mm, the breaking strength is not less than 5.5cN/dtex, the cotton mixing speed is 10-15 m/min, the cotton mixing time is 15-20 min, the cotton carding speed is 25-30 m/min, the drawing speed is 80-100 m/min, the roving twist is 35-40 twists/10 cm, the twist is 80-90 twists/10 cm, the weaving speed is 300-350 r/min, the warp density is 380-420 yarns/10 cm, and the weft density is 280-320 yarns/10 cm.
  9. 9. The method for preparing the high-modulus regenerated viscose fiber composite fabric according to claim 1, wherein the hot rolling temperature of hot rolling and compounding in the step S5 is 125-135 ℃, the hot rolling pressure is 0.3-0.4 MPa, the hot rolling speed is 6-7 m/min, the shaping treatment temperature is 130-140 ℃, the shaping time is 30-40S, and the shaping tension is 50-60N.
  10. 10. The high-modulus regenerated viscose fiber composite fabric prepared by the preparation method of any one of claims 1 to 9 is characterized in that the breaking modulus of the high-modulus regenerated viscose fiber composite fabric is 520-580N/mm < 2 >, the retention rate of wet modulus is more than or equal to 85%, and the moisture regain is more than or equal to 13%.

Description

Preparation method of high-modulus regenerated viscose composite fabric Technical Field The invention relates to the technical field of textile materials, in particular to a preparation method of a high-modulus regenerated viscose composite fabric. Background The regenerated viscose fiber is an environment-friendly regenerated fiber prepared from natural cellulose (such as wood pulp and cotton linters) by chemical dissolution and re-spinning, has the hygroscopicity, softness and degradability of the natural fiber, is widely applied in the textile industry, and occupies more than 80% of the regenerated cellulose fiber market at present. However, the traditional regenerated viscose fiber has inherent defects of low crystallinity (35-55%) and insufficient molecular chain orientation, so that the manufactured fabric has low breaking modulus and poor stretch deformation resistance, the wet modulus is only less than 50% of the dry modulus, and the problems of wrinkling, deformation and the like easily occur after long-term use or washing, thus severely limiting the application of the regenerated viscose fiber in the high-end textile field. In order to improve the modulus of the regenerated viscose fiber fabric, two improved ideas are mainly adopted in the prior art, namely, the regenerated viscose fiber is subjected to single modification treatment, such as surface modification by a silane coupling agent or nanoparticle filling, but the single modification is difficult to realize the great improvement of modulus, and the fiber is easy to cause the hardening of hand feeling and the reduction of air permeability, and the regenerated viscose fiber and the high-modulus fiber are subjected to simple blending and compounding, but the surface polarity difference of the two fibers is large, the interfacial binding force is weak, the modulus improving effect of the compounded fabric is limited, the defects of layering, fuzzing, pilling and the like are easy to occur, and meanwhile, the price of the lyocell fiber is 1.5 times that of the regenerated viscose fiber, and the production cost is greatly increased. Disclosure of Invention The invention aims to provide a preparation method of a high-modulus regenerated viscose fiber composite fabric, which has the advantages of simple preparation process and controllable cost, can effectively solve the problems of low modulus, poor interface combination, unstable performance and the like of the regenerated viscose fiber composite fabric, and simultaneously has the advantages of environmental protection and practicability. The technical aim of the invention is realized by the following technical scheme: the preparation method of the high-modulus regenerated viscose composite fabric comprises the following steps: S1, selecting regenerated viscose staple fibers, soaking the regenerated viscose staple fibers in deionized water, then placing the regenerated viscose staple fibers in an oven for drying until the moisture content of the fibers is reduced to 8-10%, and carding to obtain uniformly-dispersed regenerated viscose fibers; s2, soaking the uniformly dispersed regenerated viscose fibers in the cellulose nanocrystalline aqueous dispersion liquid, performing treatment under the assistance of ultrasonic waves, taking out and performing pre-drying; S3, respectively and sequentially dipping the regenerated viscose fibers treated in the step S2 into a solution containing a waterborne polyurethane prepolymer and a chain extender and a silane coupling agent, carrying out in-situ interfacial polymerization reaction, and dehydrating, drying and curing to obtain modified regenerated viscose fibers after a coating is formed; S4, mixing the modified regenerated viscose fibers with high-modulus polyester staple fibers, sequentially carding, drawing, roving and spinning after cotton mixing to prepare blended yarns, and weaving by an air jet loom to obtain a primary-made composite fabric; s5, carrying out hot rolling compounding, shaping treatment and washing drying on the primary composite fabric to obtain the high-modulus regenerated viscose composite fabric. Preferably, the fineness of the regenerated viscose staple fibers in the step S1 is 1.2-1.5 dtex, the length is 38-42 mm, the soaking temperature of deionized water is 25-30 ℃, the soaking time is 20-30 min, the drying temperature of an oven is 80-85 ℃, and the drying time is 2-3 h. Preferably, the preparation method of the cellulose nanocrystal aqueous dispersion in the step S2 comprises the steps of adding microcrystalline cellulose into a sulfuric acid solution with the concentration of 60-65wt%, acidolysis for 60-90 min at the temperature of 45-50 ℃, centrifuging and dialyzing to neutrality to obtain the cellulose nanocrystal aqueous dispersion with the mass fraction of 1-3wt%, and the bath ratio of the regenerated viscose staple fibers in the cellulose nanocrystal aqueous dispersion is 1:20-1:30. Preferably, in the step S2, the ultra