Natural pearl fiber mesh fabric and preparation method thereof

Abstract

The invention relates to the field of functional textile materials, and discloses a natural pearl fiber mesh fabric and a preparation method thereof. Natural pearl powder is adopted as a core functional raw material, natural antibacterial components, the contact cool feeling characteristic and bioactive factors contained in the pearl material are fully utilized, and permanent combination of functional components and a fiber matrix is achieved in the yarn spinning stage; hidden dangers such as heavy metal accumulation, toxic residue precipitation and microbial drug resistance induction are avoided, and the fabric is endowed with a self-maintaining functional characteristic through a copolymerization combination mechanism of pearl calcium carbonate crystals and fibers. A final product shows performance which is obviously superior to that of a chemical treatment scheme in the aspects of contact cool feeling response efficiency, broad-spectrum antibacterial durability, far infrared radiation stability and amino acid slow release capability, and meanwhile, the synergistic effect of natural functions is further amplified by combining with a three-dimensional mesh structure design; and durability and environmental friendliness are realized on the premise of ensuring zero chemical addition.

Description

Technical Field

[0001] The invention relates to the field of functional textile materials, in particular to a natural pearl fiber mesh fabric and a preparation method thereof. Background Art

[0002] Currently, products on the market that achieve cool contact, antibacterial properties, far infrared rays, and high amino acid content are usually achieved through the following methods, all of which have certain risks:

[0003] Cool touch

[0004] 1. Basically use polyamide cooling fiber or add cooling additives (xylitol / jade powder) during dyeing and finishing.

[0005] Polyamide fibers have limited cooling effects, and adding cooling agents during dyeing and finishing poses environmental risks such as poor durability (ineffective after 5 washes), clogging of the mesh affecting breathability, and poor biodegradability of some organic cooling agents.

[0006] 2. Antibacterial function

[0007] It mainly relies on the following three methods:

[0008] ① Add silver ions / quaternary ammonium salts to blended yarn;

[0009] ② Antibacterial auxiliaries for dyeing and finishing;

[0010] ③ Sterilization in irradiation chamber (ethylene oxide / electron beam);

[0011] Among them: chemical antibacterial agents (Class ① / ②) have dissolution safety risks (silver ion accumulation), poor washability (the antibacterial rate decreases by >30% after 10 washes), and induce microbial resistance; although irradiation chamber treatment (Class ③) can be sterilized instantly, it has the defects of non-persistence (only one-time sterilization), high-energy rays destroying fiber structure (spandex breaking strength decreases by ≥15%), and ethylene oxide residual carcinogens (exceeding the standard rate by >5%).

[0012] c. Far infrared

[0013] This is usually achieved by fiber blending ceramic powder (zirconium carbide / titanium dioxide) or dyeing and coating.

[0014] The weak bonding between ceramic powder and fiber results in poor durability (powder shedding rate >30% after 50 frictions) and emissivity fluctuation >15%. High addition will increase the weight of the fabric and reduce the mesh air permeability by ≥35%.

[0015] d. High amino acid content

[0016] Amino acids such as sericin are attached to the fiber surface mainly through dyeing and finishing grafting / microencapsulation technology.

[0017] Amino acid molecules are highly hydrophilic, and there are safety risks such as low fixation efficiency (loss rate after one washing > 60%) and cross-linking agents containing toxic substances such as formaldehyde / APEO; rupture of microcapsules will cause the fabric surface to be mottled and sticky.

[0018] In summary, existing technologies usually have core pain points such as insufficient functional durability (failure due to washing / friction), safety risks of chemical additives (heavy metals / toxic residues), environmental defects (biological toxicity / difficulty in degradation), and complex production processes. To this end, a natural pearl fiber mesh fabric and a preparation method are proposed. Summary of the Invention

[0019] In view of the shortcomings of the prior art, the present invention provides a natural pearl fiber mesh fabric and a preparation method to solve the background technical problems.

[0020] To achieve the above object, the present invention provides the following technical solutions:

[0021] In a first aspect, a natural pearl fiber mesh fabric comprises:

[0022] Pearl viscose fiber components: viscose spinning solution is used as a matrix, and nano-pearl powder is evenly dispersed in the matrix to prepare pearl viscose fiber. The nano-pearl powder is selected to have a particle size of 1 μm and an aragonite-type CaCO3 content of ≥95%;

[0023] Blended yarn: 55% long-staple cotton, 25% fine-denier polyester and 20% pearl viscose fiber;

[0024] Fabric structure: The mesh structure is formed by the warp knitting process of blended yarns, with hexagonal units, an open porosity of 45%±5%, and a pore size of 0.5–2mm.

[0025] Preferably, the nano pearl powder is modified with a silane coupling agent KH-550, and the amount of the modifier added is 1.5-2% of the mass of the pearl powder.

[0026] Preferably, in the pearl viscose fiber, the dispersed concentration of nano-pearl powder is 5-8 wt %, and the α-cellulose content in the viscose spinning solution matrix is ​​≥92%.

[0027] In a second aspect, a method for preparing a natural pearl fiber mesh fabric is provided, for producing the natural pearl fiber mesh fabric described in the first aspect, comprising the following steps:

[0028] (1) Preparation of pearl viscose fiber:

[0029] Nano-pearl powder with a particle size of 1 μm and aragonite-type CaCO3 ≥ 95% was screened out, and the nano-pearl powder was modified with silane coupling agent KH-550 to obtain modified nano-pearl powder. The mass of silane coupling agent KH-550 used was 1.5–2% of the mass of the nano-pearl powder.

[0030] A viscose spinning solution containing α-cellulose ≥ 92% was selected, and the modified pearl powder was dispersed in the viscose spinning solution at 5–8 wt%. The solution was homogenized at 50 MPa for three cycles to make the particle size distribution of the nano-pearl powder D90 ≤ 2 μm.

[0031] The homogenized pearl powder / viscose dispersion was extruded through a spinneret using wet spinning technology and then placed in a coagulation bath containing 10% H2SO4 and 15% Na2SO4 at a draft ratio of 1:3.2. A pearl-viscose composite fiber with a cortical structure enriched with pearl particles was obtained through copolymerization.

[0032] (2) Preparation of blended yarn:

[0033] Raw material ratio: 55% long-staple cotton, 25% fine denier polyester (0.8D×38mm), 20% pearl viscose fiber obtained in step (1);

[0034] Spinning process: cleaning the raw materials → carding (cylinder speed 400 rpm) → drawing (6 yarns combined) → roving (twist 4.0 twist / inch) → spun yarn (40S) → winding to obtain 40S blended yarn;

[0035] (3) Mesh cloth weaving:

[0036] The 40S blended yarn obtained in step (2) is knitted using a 28G double needle bed warp knitting machine to produce a hexagonal mesh structure fabric with an opening rate of 45%±5% and an aperture of 0.5-2 mm, and the finished fabric is obtained after washing and shaping.

[0037] Preferably, the twist coefficient of the spinning process is 400±10 to compensate for the effect of 1 μm pearl powder on strength.

[0038] Preferably, the drawing process adopts pressure bar drafting with a spacing of 45 mm to improve the parallelism of the fibers.

[0039] Preferably, the long-staple cotton selected has a micronaire value of 4.2-4.5.

[0040] Preferably, the fine denier polyester selected has a fineness of 0.8D and a length of 38 mm.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention adopts natural pearl powder as the core functional raw material, fully utilizing the natural antibacterial components, contact cooling properties and bioactive factors contained in the pearl material itself, and realizes the permanent combination of functional components and fiber matrix in the yarn spinning stage, which not only avoids the hidden dangers such as heavy metal accumulation, precipitation of toxic residues, and induction of microbial resistance, but also gives the fabric self-sustaining functional properties through the copolymerization and bonding mechanism of pearl calcium carbonate crystals and fibers, so that the final product shows significantly better performance than chemical treatment solutions in terms of contact cooling response efficiency, broad-spectrum antibacterial persistence, far-infrared radiation stability and amino acid sustained release capacity. At the same time, the three-dimensional mesh structure design further amplifies the synergistic effect of natural functions, and achieves durability and environmental friendliness under the premise of ensuring zero chemical addition.

[0043] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the structure and parameters of the natural pearl fiber mesh fabric of the present invention;

[0045] Figure 2 This is a schematic diagram of the electron microscope of the precious nano-pearl powder of the present invention. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this technical field without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] See also Figure 1 and Figure 2 The natural pearl fiber mesh fabric and preparation method of the present invention include the following contents:

[0048] 1. Raw Materials Preparation

[0049] Pearl powder modification:

[0050] Select nano-pearl powder with a particle size of 1.0±0.2μm and an aragonite-type CaCO3 content of ≥95%, and use a laser particle size analyzer to detect the screened nano-pearl powder to ensure that its particle size distribution D50 = 1.0±0.2μm; Figure 2As shown, pearl powder has a nanometer and micrometer structure, with multiple layers stacked together to form a honeycomb shape. It also contains a variety of active proteases and has the activity of organic matter, which makes its performance characteristics have the synergy of multiple functions, which is different from the single efficacy of inorganic substances.

[0051] Silane coupling agent KH-550 is added to the nano pearl powder at a rate of 1.5-2% of the mass of the pearl powder, and the mixture is modified in a high-speed mixer.

[0052] Silane coupling agent KH-550 forms Si-O-Ca bonds on the surface of pearl powder, enhancing the interfacial bonding strength with the adhesive.

[0053] Viscose spinning solution:

[0054] Select viscose spinning solution with α-cellulose content ≥92%.

[0055] 2. Preparation of Pearl Viscose Fiber

[0056] Mixed:

[0057] Dispersing the modified pearl powder in the viscose spinning solution at 5-8 wt%;

[0058] The modified pearl powder and viscose spinning solution were circulated for 3 times in a 50MPa high-pressure homogenizer.

[0059] The modified pearl powder used has a particle size distribution of D90≤2μm.

[0060] High-pressure shear force destroys pearl powder agglomerates, ensuring the fluidity of the spinning solution and the uniform distribution of pearl powder in the fiber.

[0061] Wet spinning:

[0062] The homogenized pearl powder / viscose dispersion is extruded through a spinneret using wet spinning technology;

[0063] The extruded spinneret enters a coagulation bath containing 10% H2SO4+15% Na2SO4 at a draft ratio of 1:3.2 for solidification, and forms a pearl viscose composite fiber with a pearl particle-enriched cortical structure through copolymerization.

[0064] The SEM test of the pearl viscose composite fiber with porous cortex structure showed that Ca in the surface layer was ≥10at%;

[0065] Pearl microparticles enriched cortical structure accelerate Ca 2+ Release, the pearl powder in the pearl viscose composite fiber is exposed over a larger area, directly contacting bacteria and improving the antibacterial efficiency.

[0066] 3. Preparation of blended yarn

[0067] Raw material ratio:

[0068] Element Proportion Specifications long-staple cotton 55％ Micronaire value 4.2-4.5 Fine denier polyester 25％ 0.8D×38mm Pearl viscose 20％ Prepared above

[0069] Spinning process: Spinning based on the above raw materials

[0070] Follow the steps below:

[0071] Cleaning → Carding (cylinder speed 400rpm);

[0072] Drawing: 6 strands are combined, using pressure bar drafting, with a gauge of 45mm (to improve fiber parallelism);

[0073] Roving: twist 4.0 twists / inch;

[0074] Spun yarn: 40S, twist coefficient 400±10 (to compensate for the effect of pearl powder on strength);

[0075] Winding: Obtain 40S blended yarn.

[0076] 4. Mesh fabric weaving:

[0077] The prepared 40S blended yarn was woven into a hexagonal mesh structure fabric with an opening rate of 45% ± 5% and an aperture of 1 mm by a 28G double needle bed warp knitting machine. Figure 1 As shown, the finished fabric is obtained after washing and shaping.

[0078] Testing of finished fabrics:

[0079] Functional indicators Test results Test standards Cool touch <![CDATA[Q max ≥0.17J / cm2]]> GB / T 35263-2017 Antibacterial rate >99% (after 50 washes) ISO 20743 Far infrared emissivity ≥0.87 (8-14 μm) GB / T 30127-2013 Amino acid sustained release Free amount High performance liquid chromatography (HPLC) Air permeability ≥1800mm / s GB / T 5453-1997 Water washing attenuation <6% (after 50 washes) GB / T 8629-2017

[0080] The entire production process does not add any cooling or antibacterial chemical additives. Relying on the natural functions of pearl fiber raw materials such as natural antibacterial, cooling and antibacterial functions, as well as the mesh structure, the finished fabric has the above four functions in one, while also having excellent fabric feel, comfort and durability.

Claims

1. A natural pearl fiber mesh fabric, characterized in that: include: Pearl viscose fiber components: viscose spinning solution is used as a matrix, and nano-pearl powder is evenly dispersed in the matrix to prepare pearl viscose fiber. The nano-pearl powder is selected to have a particle size of 1 μm and an aragonite-type CaCO3 content of ≥95%; Blended yarn: 55% long-staple cotton, 25% fine-denier polyester and 20% pearl viscose fiber; Fabric structure: The mesh structure is formed by the warp knitting process of blended yarns, with hexagonal units, an open porosity of 45%±5%, and a pore size of 0.5–2mm.

2. A natural pearl fiber mesh fabric according to claim 1, characterized in that: The nano pearl powder is modified by a silane coupling agent KH-550, and the amount of the modifier added is 1.5-2% of the mass of the pearl powder.

3. The natural pearl fiber mesh fabric according to claim 1, characterized in that: In the pearl viscose fiber, the dispersion concentration of nano pearl powder is 5-8wt%, and the content of α-cellulose in the viscose spinning liquid matrix is ​​≥92%.

4. A method for preparing a natural pearl fiber mesh fabric, characterized in that: The method for producing the natural pearl fiber mesh fabric according to any one of claims 1 to 3 comprises the following steps: (1) Preparation of pearl viscose fiber: Nano-pearl powder with a particle size of 1 μm and aragonite-type CaCO3 ≥ 95% was screened out, and the nano-pearl powder was modified with silane coupling agent KH-550 to obtain modified nano-pearl powder. The mass of silane coupling agent KH-550 used was 1.5–2% of the mass of the nano-pearl powder. A viscose spinning solution containing α-cellulose ≥ 92% was selected, and the modified pearl powder was dispersed in the viscose spinning solution at 5–8 wt%. The solution was homogenized at 50 MPa for three cycles to make the particle size distribution of the nano-pearl powder D90 ≤ 2 μm. The homogenized pearl powder / viscose dispersion was extruded through a spinneret using wet spinning technology and then placed in a coagulation bath containing 10% H2SO4 and 15% Na2SO4 at a draft ratio of 1:3.

2. A pearl-viscose composite fiber with a cortical structure enriched with pearl particles was obtained through copolymerization. (2) Preparation of blended yarn: Raw material ratio: 55% long-staple cotton, 25% fine denier polyester (0.8D×38mm), 20% pearl viscose fiber obtained in step (1); Spinning process: cleaning the raw materials → carding (cylinder speed 400 rpm) → drawing (6 yarns combined) → roving (twist 4.0 twist / inch) → spun yarn (40S) → winding to obtain 40S blended yarn; (3) Mesh cloth weaving: The 40S blended yarn obtained in step (2) is knitted using a 28G double needle bed warp knitting machine to produce a hexagonal mesh structure fabric with an opening rate of 45%±5% and an aperture of 0.5-2 mm, and the finished fabric is obtained after washing and shaping.

5. The method for preparing a natural pearl fiber mesh fabric according to claim 4, characterized in that: The twist coefficient of the spinning process is 400±10 to compensate for the effect of 1 μm pearl powder on strength.

6. The method for preparing a natural pearl fiber mesh fabric according to claim 4, characterized in that: The drawing process adopts pressure bar drafting with a spacing of 45 mm to improve the parallelism of the fibers.

7. The method for preparing a natural pearl fiber mesh fabric according to claim 4, characterized in that: The selected long-staple cotton has a micronaire value of 4.2-4.

5.

8. The method for preparing a natural pearl fiber mesh fabric according to claim 4, characterized in that: The selected fine denier polyester has a fineness of 0.8D and a length of 38mm.

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