CN-122013389-A - Preparation method of roving-bar core-wrapped impact-resistant composite yarn and composite yarn

CN122013389ACN 122013389 ACN122013389 ACN 122013389ACN-122013389-A

Abstract

A preparation method of a core-wrapped type impact-resistant composite yarn of a roving bar comprises the steps of firstly loading shear hardening glue on the roving, drying to obtain the composite roving, secondly rolling the composite roving to obtain a functional roving bar, thirdly wrapping two functional roving bars on the surface of the high-performance fiber filament respectively in opposite twisting directions and the same twisting degree by taking the high-performance fiber filament as a core yarn to obtain the core-wrapped type impact-resistant composite yarn of the roving bar, wherein the composite yarn comprises the high-performance fiber filament serving as the core yarn and a coating layer, the coating layer comprises two functional roving bars, the functional roving bars are prepared by the steps of immersing the roving in the shear hardening glue and rolling, one of the functional roving bars is wrapped on the surface of the high-performance fiber filament, and the other functional roving bar is wrapped on the outer surface of the previous functional roving bar in opposite twisting directions. Therefore, the design has better stability of impact resistance.

Inventors

CAI GUANGMING
WU GUILIN
ZHAO ZHONG
LI DAIQI
YANG QI

Assignees

武汉纺织大学

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (10)

1. The preparation method of the rove-wrapped core type impact resistant composite yarn is characterized by comprising the following steps of: Firstly, mixing and stirring shear hardening glue and a volatile organic solvent to obtain a shear hardening glue dispersion liquid, immersing the roving in the shear hardening glue dispersion liquid and carrying out ultrasonic treatment at room temperature until the roving is covered by white colloid to obtain modified roving; The second step, rolling the composite roving (1) to obtain a functional roving bar (11); And thirdly, taking the high-performance fiber filaments (3) as core yarns, and wrapping the two functional roving strips (11) on the surfaces of the high-performance fiber filaments (3) in turn with opposite twisting directions and the same twisting degree to obtain the roving strip wrapped core type impact resistant composite yarns.
2. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the first step, the solid-to-liquid ratio of the shear-hardening glue to the volatile organic solvent in the shear-hardening glue dispersion is 0.3g-1 g/1 ml; in the first step, the fineness of the roving is 200tex-800tex; in the third step, the fineness of the high-performance fiber filaments (3) is 100D-600D.
3. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the first step, the volatile organic solvent is any one or combination of absolute ethyl alcohol and acetone.
4. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the first step, the roving is immersed in the shear hardening glue dispersion liquid and is subjected to ultrasonic treatment at room temperature until the roving is covered by white colloid, and the modified roving is obtained by the following steps: Immersing the roving into the shear hardening glue dispersion liquid, and carrying out ultrasonic treatment at room temperature, wherein the ultrasonic power of the ultrasonic treatment is 50W-300W, and the modified roving is obtained after the ultrasonic treatment is carried out for 20min-40 min.
5. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the second step, the rolling treatment is realized by a rolling device (4), and the rolling device (4) comprises an input guide rod (41), an output gear (5), a pressure roller (6), a telescopic spring component (7), an output guide rod (8) and a winding mechanism (9); the input guide rod (41), the output gear (5) and the output guide rod (8) are flush; the pressure roller (6) is positioned right above the output gear (5), and the pressure roller (6) and the output gear (5) are arranged up and down oppositely, and a rolling gap (51) for the composite roving (1) to pass through is formed between the pressure roller (6) and the output gear (5); the top of the pressure roller (6) is connected with the bottom of the telescopic spring component (7); The input guide rod (41) is positioned at the inlet side of the rolling gap (51), the input guide rod (41) guides the composite roving (1) into the rolling gap (51), the output guide rod (8) is positioned at the outlet side of the rolling gap (51), and the output guide rod (8) guides the rolled functional roving (11) to the winding mechanism (9).
6. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the second step, the rolling pressure of the rolling treatment is 1MPa-5MPa, and the rolling output rotating speed is 5r/min-20r/min; In the second step, the functional roving (11) is a flat strip, the thickness of the functional roving (11) is 0.3mm-1.2mm, and the width of the functional roving (11) is 5mm-10mm.
7. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the third step, the step of wrapping the two functional roving strands (11) on the surface of the high-performance fiber filament (3) in turn with opposite twist directions and the same twist with the high-performance fiber filament (3) as a core yarn means that: the method comprises the steps of taking a high-performance fiber filament (3) as a core yarn, adopting a hollow spindle cladding device (10) to respectively wrap two functional roving strips (11) on the surface of the high-performance fiber filament (3) in turn with opposite twisting directions and the same twisting degree, wherein the spindle rotating speed is 2000-6000 rpm during wrapping, and the twisting degree is 200-1000 twists/cm.
8. The method for preparing the roving-wrapped core-type impact resistant composite yarn according to claim 1, which is characterized in that: In the third step, the high-performance fiber filaments (3) are any one or any combination of aramid 1414 fibers, PBO fibers, ultra-high molecular weight polyethylene fibers and polyimide fibers.
9. A roving-wrapped core type impact resistant composite yarn is characterized in that the composite yarn is prepared by the preparation method of the roving-wrapped core type impact resistant composite yarn according to any one of claims 1-8; the composite yarn comprises high-performance fiber filaments (3) and a coating layer (2); the high-performance fiber filament (3) is a core yarn; The coating layer (2) comprises two functional roving bars (11), wherein the functional roving bars (11) are prepared by immersing roving in shear hardening glue and then rolling; One of the functional roving strips (11) is wrapped on the surface of the high-performance fiber filament (3), the other functional roving strip (11) is wrapped on the outer surface of the previous functional roving strip (11) in the opposite twisting direction, and the twisting degrees of the two functional roving strips (11) are consistent.
10. The core-wrapped impact resistant composite yarn of claim 9, wherein the weight of the shear hardening glue loaded on the functional roving (11) is more than 70% of the total weight of the functional roving (11).

Description

Preparation method of roving-bar core-wrapped impact-resistant composite yarn and composite yarn Technical Field The invention relates to a preparation method of composite yarn and composite yarn, belongs to the technical field of spinning, and particularly relates to a preparation method of roving-bar core-wrapped impact-resistant composite yarn and composite yarn. Background The high impact resistant protective material is increasingly required in the fields of sports equipment, industrial production, emergency rescue, package and transportation and the like, and the traditional ceramic, metal, fiber resin composite board and other materials have good impact resistance, but have the problems of high rigidity, heavy mass, poor flexibility, easy brittle fracture and the like, and are difficult to meet the application requirements of light weight and softness. In order to solve the problem of insufficient flexibility of the traditional protective material, high-strength high-modulus fibers such as aramid fibers, ultra-high molecular weight polyethylene and the like are generally adopted to prepare the impact-resistant yarn, and the fibers have excellent mechanical properties and certain flexibility, however, the simple twisting of single or multiple fibers is easy to generate stress concentration when impacted, so that the yarn is bifurcated or broken, and the effective unification of the flexibility and the impact resistance is difficult to realize. In order to further improve the impact resistance, a shear thickening fluid or a shear hardening adhesive is generally introduced into a yarn system, so that a material can be rapidly converted into a rigid state from a flexible state under instantaneous high-speed impact to dissipate energy, and the material recovers to be soft after external force is removed, thereby realizing the synergy of the impact resistance and comfort. The application number is 20221166166 & 1.X, and the application date is 2022, 12 and 23, and Chinese patent application discloses a liquid fluid flexible linear material, a composite yarn forming method and application thereof, wherein the liquid fluid flexible linear material is of a core-sheath composite structure and comprises a liquid fluid material serving as a core layer, a film layer for packaging the liquid fluid material, and a flexible strip serving as a sheath layer and wrapping the film layer and wrapping and winding the outer side of the film layer. While this patent addresses the difficulty of liquid fluid failing to comb and draw into yarn, it still has the following drawbacks: The design relies on the film layer to physically encapsulate the liquid fluid material, and the film layer is only in interface lamination with the liquid fluid and the external fiber strips, so that stripping damage is easy to occur under long-term use or repeated impact, medium leakage and interlayer separation are caused, and poor stability of impact resistance is still caused. The disclosure of this background section is only intended to increase the understanding of the general background of the present patent application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to overcome the defect and problem of poor stability of impact resistance in the prior art, and provides a preparation method of a roving-wrapped core type impact resistant composite yarn with good stability of impact resistance and the composite yarn. In order to achieve the purpose, the technical scheme of the invention is that the preparation method of the rove-wrapped core type impact resistant composite yarn and the composite yarn comprise the following steps: Firstly, mixing and stirring shear hardening glue and a volatile organic solvent to obtain a shear hardening glue dispersion liquid, immersing the roving in the shear hardening glue dispersion liquid and carrying out ultrasonic treatment at room temperature until the roving is covered by white colloid to obtain modified roving; the second step, rolling the composite roving to obtain a functional roving bar; And thirdly, taking high-performance fiber filaments as core yarns, and respectively wrapping two functional roving strips on the surfaces of the high-performance fiber filaments in turn with opposite twisting directions and the same twisting degree to obtain the roving strip wrapped core type impact resistant composite yarns. In the first step, the solid-to-liquid ratio of the shear-hardening glue to the volatile organic solvent in the shear-hardening glue dispersion is 0.3g-1 g/1 ml; in the first step, the fineness of the roving is 200tex-800tex; in the third step, the fineness of the high-performance fiber filaments is 100D-600D. In the first step, the volatile organic solvent is any one or combination of absolute ethyl alcohol and acetone. In the first st