Super-light left-right twist lyocell cool-feeling sunscreen functional fabric and preparation method thereof

Abstract

The application discloses an ultra-light left-right twist Tencel cool-feeling sunscreen functional fabric, which is interwoven by using plain change weave organization of warp yarn and weft yarn, has a fabric weight of 60-80 g / m2, and has a thickness of 0.12-0.18 mm. Compared with the prior art, the application has the following advantages: multi-function integration; by simultaneously introducing nano-mica cool particles and nano-zinc oxide sunscreen particles in the Tencel spinning stage, the integration of the cool feeling and the sunscreen function is realized, and problems such as poor function durability, influence on fabric hand feeling and air permeability and the like caused by the post-finishing process are avoided. The nano-mica particles have excellent heat conduction performance, can quickly conduct the heat of the human body, and produce obvious contact cool feeling; the nano-zinc oxide particles can simultaneously absorb and scatter ultraviolet rays, provide efficient and durable ultraviolet protection, have excellent wrinkle resistance stability, an ultra-light quality and good air permeability, and are durable in function.

Description

Technical Field

[0001] This invention relates to the field of textile fabric technology, specifically to a functional fabric of left- and right-hand twisted Tencel that combines ultra-lightweight texture, excellent cooling properties, and high UV protection, and its preparation method. Background Technology

[0002] Tencel fiber, an environmentally friendly regenerated cellulose fiber, is produced from coniferous tree pulp using a closed-loop solvent spinning process. It possesses excellent moisture absorption, breathability, skin-friendliness, and drape, making it an ideal choice for summer clothing fabrics. However, traditional Tencel fabrics have the following technical drawbacks: Easy to wrinkle and deform: The inherent torque of a single tcel yarn makes the fabric prone to twisting, wrinkling and dimensional instability after weaving, affecting the appearance and durability of the garment.

[0003] Insufficient sun protection: Natural Tencel fibers have a weak ability to block ultraviolet rays. Untreated Tencel fabrics typically have a UPF value of only 5-10, which cannot meet the needs of outdoor sun protection in summer.

[0004] Limited cooling effect: Although Tencel fiber itself has certain moisture absorption and heat dissipation properties, its cooling effect is not obvious in high temperature and high humidity environments, making it difficult to provide a lasting comfortable experience.

[0005] Lightweight and functionality are difficult to balance: In order to improve sun protection and cooling performance, existing technologies often use finishing processes or increase fabric thickness, resulting in increased fabric weight and losing the original lightweight advantage of Tencel fabric.

[0006] Currently, most Tencel cooling and sun-protective fabrics on the market are finished by coating the fabric surface with cooling and sun-protective agents. This method has problems such as poor functional durability, significant reduction in effectiveness after multiple washes, and impact on fabric feel and breathability. Furthermore, fabrics woven from single-twist Tencel yarns still have the inherent defect of being prone to wrinkling and deformation.

[0007] Therefore, developing a Tencel functional fabric that can simultaneously solve the above problems and possesses ultra-lightweight texture, excellent cooling properties, high UV protection, and good wrinkle resistance has significant market value and application prospects. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultra-lightweight, left-right twisted Tencel cooling and sun-protective functional fabric and its preparation method.

[0009] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: an ultra-lightweight, left-right twisted Tencel cooling and sun-protective functional fabric, which is woven from warp and weft yarns using a plain weave variation structure, with a fabric weight of 60-80g / m² and a thickness of 0.12-0.18mm; Both the warp and weft yarns are made of functionally modified Tencel fibers. The functionally modified Tencel fibers use Tencel cellulose as a matrix and uniformly disperse nano-mica particles and nano-zinc oxide particles, wherein the mass fraction of nano-mica particles is 2-5% and the mass fraction of nano-zinc oxide particles is 1-3%. Both the warp and weft yarns are composed of alternating S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn in a 1:1 ratio.

[0010] Furthermore, the fineness of the functional modified Tencel fiber is 0.8-1.2 denier, and the length is 38-51 mm; the count of the S-twist and Z-twist functional modified Tencel yarns is 60-80 English count, and the twist is 800-1200 twists / meter.

[0011] Furthermore, the nano-mica particles are muscovite powder with a surface modified by a silane coupling agent, and the average particle size is 50-100 nm; the nano-zinc oxide particles are rutile zinc oxide with a surface modified by a silane coupling agent, and the average particle size is 20-50 nm.

[0012] Furthermore, the plain weave variation is a 2 / 2 square plain weave, with a warp density of 180-220 threads / inch and a weft density of 160-200 threads / inch.

[0013] Furthermore, the fabric has a coolness-to-the-touch value Q-max≥0.25W / cm², an ultraviolet protection factor (UPF)≥50+, a UVA transmittance≤5%, and after 50 washes according to GB / T 8629-2017 standard, the UPF value is still ≥45 and the Q-max value is still ≥0.22W / cm².

[0014] A method for preparing an ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric includes the following steps: Step 1: Preparation of functional modified Tencel fiber. Surface-modified mica nanoparticles and zinc oxide nanoparticles modified with silane coupling agent are added to an aqueous solution of N-methylmorpholine-N-oxide (NMMO) at a mass ratio of (2-5):(1-3). The mixture is stirred at high speed at 80-90℃ for 30-60 minutes, and then ground in a sand mill for 2-3 hours to obtain a uniformly dispersed functional particle dispersion. After crushing the coniferous wood pulp, it is mixed with the above-mentioned functional particle dispersion and stirred at 120-140℃ to dissolve it, thus obtaining a spinning solution with a cellulose mass fraction of 10-15%. After filtering and degassing the spinning solution, the spinning solution is spun using a dry-jet wet spinning process. The nascent fibers obtained by spinning are stretched, washed, oiled, dried and cut to obtain functional modified Tencel fibers. Step 2: Preparation of left and right twist functional modified Tencel yarn. The functional modified Tencel fibers are sequentially processed through opening, carding, drawing and roving to produce roving; The roving is spun into S-twist and Z-twist yarns on a spinning machine. The spun S-twist and Z-twist yarns are then wound, doubled, and doubled twisted to obtain left and right twist modified Tencel yarns. Step 3: Fabric weaving. S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn are alternately arranged in a 1:1 ratio as warp yarns, and then warped and sizing is performed. S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn are alternately arranged in a 1:1 ratio as weft yarns and woven on an air-jet loom to obtain greige fabric; Step 4: Dyeing and finishing treatment. The woven fabric is desized, scalded and bleached, and then dyed with reactive dyes at a temperature of 60-80℃ for 40-60 minutes. The dyed fabric undergoes softening and pre-shrinking treatment, followed by a setting treatment at a temperature of 150-160℃ for 30-60 seconds to obtain the finished fabric.

[0015] Furthermore, in step one, the spinning temperature is 90-110℃, the air layer height is 10-20mm, the coagulation bath is an NMMO aqueous solution at 10-20℃, and the coagulation bath concentration is 10-20%.

[0016] Furthermore, in step two, the yarn count is 60-80 English count and the twist is 800-1200 twists / meter.

[0017] Furthermore, in step three, the air-jet loom uses a 2 / 2 square weave, with warp density controlled at 180-220 ends / inch and weft density controlled at 160-200 ends / inch.

[0018] Furthermore, in step four, the amount of softener used for softening is 2-4% (owf), the pre-shrinking temperature is 120-140℃, and the pre-shrinking time is 30-60 seconds.

[0019] With the above structure, this invention has the following advantages: 1. Multi-functional integration: By simultaneously introducing nano-mica cooling particles and nano-zinc oxide sun-protective particles during the Tencel spinning stage, the cooling and sun-protective functions are integrated, avoiding problems such as poor functional durability and impact on fabric feel and breathability caused by finishing processes. Nano-mica particles have excellent thermal conductivity, which can quickly conduct human body heat away, producing a noticeable cooling sensation upon contact; nano-zinc oxide particles can simultaneously absorb and scatter ultraviolet rays, providing highly efficient and long-lasting ultraviolet protection.

[0020] 2. Excellent wrinkle resistance and stability: The fabric uses S-twist and Z-twist functional modified Tencel yarns arranged alternately in a 1:1 ratio as warp and weft yarns. The torque of the yarns with opposite twists cancels each other out, which effectively solves the problems of easy twisting, wrinkling and dimensional instability of traditional Tencel fabrics, giving the fabric good wrinkle resistance and shape retention.

[0021] 3. Ultra-lightweight texture and excellent breathability: Utilizing high-count, fine-denier functional modified Tencel fibers (0.8-1.2 denier) and a 2 / 2 plain weave, the fabric weight is controlled at 60-80 g / m² and the thickness at 0.12-0.18 mm while ensuring sufficient strength and functional performance, achieving ultimate lightweighting. Simultaneously, the 2 / 2 plain weave has a good porous structure, ensuring excellent breathability and moisture permeability.

[0022] 4. Durable and long-lasting function: Because the functional particles are evenly dispersed inside the Tencel fibers during the spinning stage, rather than being coated onto the fabric surface through finishing, the fabric's cooling and sun protection functions have excellent washability and durability. After 50 washes, the UPF value is still ≥45 and the Q-max value is still ≥0.22W / cm². Detailed Implementation

[0023] The present invention will be further described in detail below through embodiments.

[0024] Example 1: An ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric, made of warp and weft yarns interwoven in a 2 / 2 plain weave, with a fabric weight of 70g / m² and a thickness of 0.15mm; Both the warp and weft yarns are made of functionally modified Tencel fiber. The functionally modified Tencel fiber uses Tencel cellulose as a matrix and uniformly disperses nano-mica particles and nano-zinc oxide particles, wherein the mass fraction of nano-mica particles is 3% and the mass fraction of nano-zinc oxide particles is 2%. Both the warp and weft yarns are composed of alternating S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn in a 1:1 ratio; The functional modified Tencel fiber has a fineness of 1.0 denier and a length of 44 mm; the S-twist and Z-twist functional modified Tencel yarns both have a count of 70 English count and a twist of 1000 twists / meter. The nano-mica particles are muscovite powder with a surface modified by γ-aminopropyltriethoxysilane, and the average particle size is 70 nm; the nano-zinc oxide particles are rutile zinc oxide with a surface modified by γ-aminopropyltriethoxysilane, and the average particle size is 30 nm. The fabric has a warp density of 200 threads / inch and a weft density of 180 threads / inch.

[0025] The preparation method of the above-mentioned ultralightweight left-right twisted Tencel cooling and sun-protective functional fabric includes the following steps: Step 1: Preparation of Functionally Modified Tencel Fibers 3 kg of γ-aminopropyltriethoxysilane-modified nano-mica particles and 2 kg of γ-aminopropyltriethoxysilane-modified nano-zinc oxide particles were added to 100 kg of 50% N-methylmorpholine-N-oxide (NMMO) aqueous solution. The mixture was stirred at 3000 r / min at 85 °C for 45 minutes, and then ground in a sand mill for 2.5 hours to obtain a uniformly dispersed functional particle dispersion. 15 kg of coniferous wood pulp was crushed and mixed with the above-mentioned functional particle dispersion. The mixture was stirred and dissolved at 130°C to obtain a spinning solution with a cellulose mass fraction of 12.5%. After filtration and degassing, the spinning solution was spun using a dry-jet wet spinning process. The spinning temperature was 100℃, the air layer height was 15mm, and the coagulation bath was a 15℃ NMMO aqueous solution with a concentration of 15%. The nascent fibers obtained from spinning are stretched, washed, oiled, dried, and cut to obtain functional modified Tencel fibers.

[0026] Step 2: Preparation of Tencel yarn with left and right twist function Functionally modified Tencel fibers are sequentially processed through opening, carding, drawing, and roving to produce roving; The roving is spun into S-twist and Z-twist yarns on a spinning machine, with a yarn count of 70 English count and a twist of 1000 twists / meter. The spun S-twist and Z-twist yarns are wound, doubled, and doubled twisted respectively to obtain left and right twist functional modified Tencel yarn.

[0027] Step 3: Fabric Weaving S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn are alternately arranged in a 1:1 ratio as warp yarns, and then warped and sizing are performed. S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn are alternately arranged in a 1:1 ratio as weft yarn; The fabric is woven on an air-jet loom using a 2 / 2 square weave, with a warp density of 200 ends / inch and a weft density of 180 ends / inch to obtain the greige fabric.

[0028] Step 4: Dyeing and Finishing The woven fabric is then desized, boiled, and bleached. Reactive dyes were used for dyeing at a temperature of 70℃ for 50 minutes. The dyed fabric is softened and pre-shrinked. The amount of softener is 3% (owf), the pre-shrinking temperature is 130℃, and the pre-shrinking time is 45 seconds. Finally, a setting process is performed at a temperature of 155℃ for 45 seconds to obtain the finished fabric.

[0029] Example 2: An ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric, made of warp and weft yarns interwoven in a 2 / 2 plain weave, with a fabric weight of 60g / m² and a thickness of 0.12mm; Both the warp and weft yarns are made of functionally modified Tencel fiber, which uses Tencel cellulose as a matrix and uniformly disperses nano-mica particles and nano-zinc oxide particles, wherein the mass fraction of nano-mica particles is 2% and the mass fraction of nano-zinc oxide particles is 1%. Both the warp and weft yarns are composed of alternating S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn in a 1:1 ratio; The functional modified Tencel fiber has a fineness of 0.8 denier and a length of 38 mm; the S-twist and Z-twist functional modified Tencel yarns both have a count of 80 English count and a twist of 1200 twists / meter. The nano-mica particles are muscovite powder with a surface modified by γ-aminopropyltriethoxysilane, and the average particle size is 50 nm; the nano-zinc oxide particles are rutile zinc oxide with a surface modified by γ-aminopropyltriethoxysilane, and the average particle size is 20 nm. The fabric has a warp density of 180 threads / inch and a weft density of 160 threads / inch.

[0030] The preparation method is basically the same as in Example 1, except that: In step one, the amount of nano-mica particles used is 2 kg, the amount of nano-zinc oxide particles used is 1 kg, the cellulose mass fraction in the spinning solution is 10%, the spinning temperature is 90℃, the air layer height is 10 mm, the coagulation bath temperature is 10℃, and the coagulation bath concentration is 10%. In step two, the yarn count is 80 English count and the twist is 1200 twists / meter; In step three, the warp density is controlled at 180 threads / inch, and the weft density is controlled at 160 threads / inch; In step four, the dyeing temperature is 60℃, the dyeing time is 40 minutes, the softener dosage is 2% (owf), the pre-shrinking temperature is 120℃, the pre-shrinking time is 30 seconds, the setting temperature is 150℃, and the setting time is 30 seconds.

[0031] Example 3: An ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric, made of warp and weft yarns interwoven in a 2 / 2 plain weave, with a fabric weight of 80g / m² and a thickness of 0.18mm; Both the warp and weft yarns are made of functionally modified Tencel fiber. The functionally modified Tencel fiber uses Tencel cellulose as a matrix and uniformly disperses nano-mica particles and nano-zinc oxide particles, wherein the mass fraction of nano-mica particles is 5% and the mass fraction of nano-zinc oxide particles is 3%. Both the warp and weft yarns are composed of alternating S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn in a 1:1 ratio; The functional modified Tencel fiber has a fineness of 1.2 denier and a length of 51 mm; the S-twist and Z-twist functional modified Tencel yarns both have a count of 60 English count and a twist of 800 twists / meter. The nano-mica particles are muscovite powder modified with γ-aminopropyltriethoxysilane, with an average particle size of 100 nm; the nano-zinc oxide particles are rutile zinc oxide modified with γ-aminopropyltriethoxysilane, with an average particle size of 50 nm. The fabric has a warp density of 220 threads / inch and a weft density of 200 threads / inch.

[0032] The preparation method is basically the same as in Example 1, except that: In step one, the amount of nano-mica particles used is 5 kg, the amount of nano-zinc oxide particles used is 3 kg, the cellulose mass fraction in the spinning solution is 15%, the spinning temperature is 110℃, the air layer height is 20 mm, the coagulation bath temperature is 20℃, and the coagulation bath concentration is 20%. In step two, the yarn count is 60 English count and the twist is 800 twists / meter; In step three, the warp density is controlled at 220 threads / inch, and the weft density is controlled at 200 threads / inch; In step four, the dyeing temperature is 80℃, the dyeing time is 60 minutes, the softener dosage is 4% (owf), the pre-shrinking temperature is 140℃, the pre-shrinking time is 60 seconds, the setting temperature is 160℃, and the setting time is 60 seconds.

[0033] The ultralight, left-right twisted Tencel cooling and sun-protective functional fabric prepared by this invention has excellent comprehensive performance: 1. The contact cooling value Q-max is ≥0.25W / cm², which is much higher than the national standard requirement of ≥0.15W / cm², and has a significant contact cooling sensation; 2. The UV protection factor (UPF) is ≥50+ and the UVA transmittance is ≤5%, reaching the highest level of UV protection standard. 3. After 50 washes according to GB / T 8629-2017 standard, the UPF value is still ≥45 and the Q-max value is still ≥0.22W / cm², indicating long-lasting and durable functionality; 4. The fabric weighs only 60-80g / m² and is only 0.12-0.18mm thick, giving it an ultra-lightweight feel; 5. The wrinkle resistance reaches grade 3.5-4.5, the shrinkage rate is ≤2.1%, and it has good wrinkle resistance and dimensional stability; 6. Its fracture strength is far higher than the national standard requirements, and it has excellent mechanical properties and durability.

[0034] The present invention and its embodiments have been described above. This description is not restrictive, and the actual structure is not limited thereto. In conclusion, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the scope of protection of this invention.

Claims

1. A lightweight, left-right twisted Tencel cooling and sun-protective functional fabric, characterized in that: It is made of plain weave with variations in the warp and weft yarns, with a fabric weight of 60-80g / m² and a thickness of 0.12-0.18mm; Both the warp and weft yarns are made of functionally modified Tencel fibers. The functionally modified Tencel fibers use Tencel cellulose as a matrix and uniformly disperse nano-mica particles and nano-zinc oxide particles, wherein the mass fraction of nano-mica particles is 2-5% and the mass fraction of nano-zinc oxide particles is 1-3%. Both the warp and weft yarns are composed of alternating S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn in a 1:1 ratio.

2. The ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric according to claim 1, characterized in that: The functional modified Tencel fiber has a fineness of 0.8-1.2 denier and a length of 38-51 mm; the S-twist and Z-twist functional modified Tencel yarns have a count of 60-80 English count and a twist of 800-1200 twists / meter.

3. The ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric according to claim 1, characterized in that: The nano-mica particles are white mica powder with a surface modified by a silane coupling agent, and the average particle size is 50-100 nm; the nano-zinc oxide particles are rutile zinc oxide with a surface modified by a silane coupling agent, and the average particle size is 20-50 nm.

4. The ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric according to claim 1, characterized in that: The plain weave variation is a 2 / 2 square plain weave, with a warp density of 180-220 threads / inch and a weft density of 160-200 threads / inch.

5. The ultralightweight left-right twisted Tencel cooling and sun-protective functional fabric according to claim 1, characterized in that: The fabric has a coolness-to-the-touch value (Q-max) ≥ 0.25 W / cm², an ultraviolet protection factor (UPF) ≥ 50+, and a UVA transmittance ≤ 5%. After 50 washes according to GB / T 8629-2017 standard, the UPF value is still ≥ 45 and the Q-max value is still ≥ 0.22 W / cm².

6. A method for preparing an ultralightweight, left-right twisted Tencel cooling and sun-protective functional fabric as described in any one of claims 1-5, characterized in that: Includes the following steps: Step 1: Preparation of functional modified Tencel fiber. Surface-modified mica nanoparticles and zinc oxide nanoparticles modified with silane coupling agent are added to an aqueous solution of N-methylmorpholine-N-oxide (NMMO) at a mass ratio of (2-5):(1-3). The mixture is stirred at high speed at 80-90℃ for 30-60 minutes, and then ground in a sand mill for 2-3 hours to obtain a uniformly dispersed functional particle dispersion. After crushing the coniferous wood pulp, it is mixed with the above-mentioned functional particle dispersion and stirred at 120-140℃ to dissolve it, thus obtaining a spinning solution with a cellulose mass fraction of 10-15%. After filtering and degassing the spinning solution, the spinning solution is spun using a dry-jet wet spinning process. The nascent fibers obtained by spinning are stretched, washed, oiled, dried and cut to obtain functional modified Tencel fibers. Step 2: Preparation of left and right twist functional modified Tencel yarn. The functional modified Tencel fibers are sequentially processed through opening, carding, drawing and roving to produce roving; The roving is spun into S-twist and Z-twist yarns on a spinning machine. The spun S-twist and Z-twist yarns are then wound, doubled, and doubled twisted to obtain left and right twist modified Tencel yarns. Step 3: Fabric weaving. S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn are alternately arranged in a 1:1 ratio as warp yarns, and then warped and sizing is performed. S-twist functional modified Tencel yarn and Z-twist functional modified Tencel yarn are alternately arranged in a 1:1 ratio as weft yarns and woven on an air-jet loom to obtain greige fabric; Step 4: Dyeing and finishing treatment. The woven fabric is desized, scalded and bleached, and then dyed with reactive dyes at a temperature of 60-80℃ for 40-60 minutes. The dyed fabric undergoes softening and pre-shrinking treatment, followed by a setting treatment at a temperature of 150-160℃ for 30-60 seconds to obtain the finished fabric.

7. The fabric preparation method according to claim 6, characterized in that: In step one, the spinning temperature is 90-110℃, the air layer height is 10-20mm, the coagulation bath is an NMMO aqueous solution at 10-20℃, and the coagulation bath concentration is 10-20%.

8. The fabric preparation method according to claim 6, characterized in that: In step two, the yarn count is 60-80 English count and the twist is 800-1200 twists / meter.

9. The fabric preparation method according to claim 6, characterized in that: In step three, the air-jet loom uses a 2 / 2 square weave, with warp density controlled at 180-220 ends / inch and weft density controlled at 160-200 ends / inch.

10. The fabric preparation method according to claim 6, characterized in that: In step four, the amount of softener used for softening is 2-4% (owf), the pre-shrinking temperature is 120-140℃, and the pre-shrinking time is 30-60 seconds.