Environment-friendly super-soft fasciated yarn

Abstract

The invention relates to an environment-friendly super-soft fasciated yarn, which comprises a yarn core, a first fasciated yarn and a second fasciated yarn, the yarn core is a microporous regenerated polyester filament yarn, and the first fasciated yarn is a thermochromic polyester filament yarn; the second fasciated yarn is composed of SORONA filaments of a core layer and modified aramid fiber yarn wound on the SORONA filaments, and modified aramid fibers are para-aramid fibers subjected to plasma-grafting treatment; the first fasciated yarn is spirally wound on the outer layer of the yarn core in a sparse and dense interval mode, and the second fasciated yarn is spirally wound on the outer layer of the first fasciated yarn in a sparse and dense interval mode; the fiber not only has the functions of strong softness, good flame retardance and good moisture absorption and sweat releasing performance, but also has certain interestingness.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textile fabrics, and particularly relates to a wrapping yarn with strong softness, good flame retardance, good moisture absorption and perspiration performance, and certain interestingness. BACKGROUND

[0002] With the acceleration of the upgrading of the textile industry towards environmental protection, functionalization and high quality, and the pursuit of life quality of people under the superimposed consumption upgrading trend, the market puts forward more stringent and diversified requirements for the comprehensive performance of yarns and terminal textiles. Consumers not only pay attention to the soft and skin-friendly experience of yarns, but also continuously improve the concern for environmental sustainability and safety protection performance, and expect products to have innovation and individualization in appearance to adapt to the use requirements in multiple scenes such as smart wear, high-end clothing and decorative fabric.

[0003] The wrapping yarns on the market at present mostly focus on the simple optimization of the basic wrapping structure, and there is a significant short board in the synergistic improvement of the core performance. It is difficult to balance softness and functionality, and the conventional high-flame-retardant yarns generally have a hard hand feeling and lack environmental protection. Some flame-retardant yarns use halogen-containing flame retardants to pursue flame-retardant effects, which will release toxic and harmful gases such as dioxin during combustion, not only harming human health, but also causing serious environmental pollution. The single appearance expressiveness is also a key factor restricting product upgrading. Traditional flame-retardant yarns mostly use fixed chemical dyeing processes, and the color is single and lacks dynamic change, which cannot realize the innovation breakthrough of visual effects. In emerging scenes such as smart wear, decorative fabric and high-end outdoor clothing, consumers urgently need products with dynamic visual response, and the fixed color design of existing yarns cannot meet the individualization and innovation needs in these scenes.

[0004] Therefore, it has become a technical problem urgently to be solved in the industry to develop a wrapping yarn with environmental protection, super-soft hand feeling, high-efficiency flame-retardant performance and temperature-sensitive color-changing function. SUMMARY

[0005] The present application aims to provide a wrapping yarn with strong softness, good flame retardance, good moisture absorption and perspiration performance, and certain interestingness.

[0006] The technical scheme adopted by the present application is as follows: an environmentally-friendly super-soft wrapping yarn, comprising a yarn core, a first wrapping yarn and a second wrapping yarn, the yarn core is a micro-porous regenerated polyester filament, the first wrapping yarn is a temperature-variable color polyester filament; the second wrapping yarn is composed of a SORONA filament of a core layer and a modified aramid fiber yarn wound on the SORONA filament, the modified aramid fiber is a para-aramid fiber treated by plasma-grafting; the first wrapping yarn is spirally wound in a dense-interval form on the outer layer of the yarn core, and the second wrapping yarn is spirally wound in a dense-interval form on the outer layer of the first wrapping yarn.

[0007] This invention utilizes a multi-layered wrapping structure to fully leverage the properties of the yarn in each layer, giving the yarn multiple functionalities. The microporous structure of the yarn core not only makes the yarn softer but also enhances its moisture absorption and wicking properties. The first wrapping yarn uses thermochromic polyester filament, allowing the yarn to display different colors as the temperature changes, adding visual interest. The SORONA filament core layer of the second wrapping yarn provides better softness, while the outer modified aramid fiber yarn provides better flame retardant properties. Both the first and second wrapping yarns are wrapped in a spaced-dense pattern, creating a subtle, translucent effect between the yarn layers. This design, combined with the thermochromic polyester filament, makes the yarn's appearance even more interesting.

[0008] Furthermore, the preparation process of the modified aramid fiber is as follows: S1. Aramid fiber pretreatment: Aramid (Kevlar 29, manufactured by DuPont) fibers are immersed in a boiling water bath for 2 hours, then ultrasonically treated for 1 hour to remove the oil from the fiber surface, and subsequently dried at 45-55℃ for 4-6 hours; the dried aramid fibers are then treated in a plasma treatment device (DBD-100 dielectric barrier discharge plasma treatment machine) to obtain surface-activated aramid fibers. The specific parameters of the plasma device are as follows: Processing time: 3–8 minutes; Medium: A mixture of Ar and O2, wherein the volume ratio of Ar to O2 is (70-80):(20-30); Processing power: 100-150W; Processing pressure: 50-80Pa.

[0009] Because of the relatively strong molecular structure of aramid fibers, they are not easy to combine with other molecules or ions. Plasma treatment can give the surface of aramid fibers many free charges, and can also form a nano-etching effect on the aramid fibers, increasing the possibility of molecules and ions combining with aramid fibers.

[0010] S2. Preparation of flame retardant modifier: Under nitrogen protection, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), melamine, and polyethylene glycol (PEG-400) were added to dimethylformamide reaction solvent in a molar ratio of 3:1:4 and reacted at 110°C for 2 hours to obtain a hydroxyl-containing phosphorus intermediate. Then, the solvent after reaction was cooled to 70°C, and 5% by mass of 2,4-diisocyanate toluene (TDI) was added as a coupling agent, followed by 0.8% by mass of triethylamine as a catalyst. The reaction was continued for 1.5 hours to obtain a phosphorus-nitrogen synergistic flame retardant modifier containing -NCO end groups.

[0011] S3. Grafting reaction: The surface-activated aramid fiber obtained in S1 is immersed in the flame-retardant modifier prepared in S2, so that the -NCO groups of the grafting agent react with the newly added -OH and -NH2 groups on the surface of the aramid fiber after plasma treatment in S1 to form a stable flame-retardant grafted layer, thereby obtaining flame-retardant grafted modified aramid fiber; the grafting reaction parameters are as follows: Reaction bath ratio: 1:20; Reaction temperature: 60℃ constant temperature; Reaction stirring speed: 50 r / min; Reaction time: 4 hours.

[0012] Grafting allows flame retardants to be combined with aramid fibers, enabling the flame retardant modifier to work together with the aramid fibers to achieve a flame retardant effect, thereby enhancing the flame retardant properties of the aramid fibers and giving the yarn a better flame retardant effect.

[0013] S4. Post-treatment: The flame-retardant grafted modified aramid obtained in S3 is washed 3-4 times with anhydrous ethanol (10 min each time) and 2-3 times with deionized water (8 min each time) to remove the ungrafted free modifier. Then it is dried in a vacuum drying oven at 80-90℃ for 2-3 hours to obtain modified aramid fiber with enhanced flame retardant effect.

[0014] Furthermore, the wrapping twist of the first wrapping yarn is 80-140 twists / 10cm, and the wrapping twist of the second wrapping yarn is 70-160 twists / 10cm.

[0015] Furthermore, the color-changing temperature of the thermochromic polyester filament is 28°C. When the ambient temperature is below 28°C, the color of the thermochromic polyester filament is gray, and when the ambient temperature is 28°C or above, the color of the thermochromic polyester filament is white.

[0016] Furthermore, the method for preparing the microporous recycled polyester filament is as follows: (1) Preparation of modified polyester chips: 70-75 parts by weight of recycled polyester chips are crystallized and dried in sequence, and then blended and melted with 20-25 parts by weight of silane coupling agent, 1-3 parts by weight of dispersant and 1-2 parts by weight of antioxidant, and then fed into a screw mixing mechanism to produce modified polyester chips.

[0017] (2) Processing alkali-soluble polyester chips: The alkali-soluble polyester chips are subjected to crystallization treatment and drying treatment in sequence and then put into use.

[0018] (3) Preparation of recycled polyester filament: 85-90 parts by weight of modified polyester chips and 10-15 parts by weight of treated alkali-soluble polyester chips are evenly mixed and fed into the screw of a spinning machine. Recycled polyester filament is prepared through screw melting, drawing and drying processes.

[0019] (4) Preparation of microporous recycled polyester filament: I. Pretreatment: The recycled polyester filament prepared in step (3) is washed in deionized water at 45°C, then washed clean with cold water, and then dried in an oven for later use. II. Alkali treatment: During alkali treatment, the prepared treatment solution is first placed in a constant temperature water bath for 15 min to balance. When the temperature of the treatment solution reaches the set equilibrium temperature, the pretreated recycled polyester filament is then placed in the treatment for a certain period of time to dissolve the alkali-soluble polyester portion in the recycled polyester filament. III. Posttreatment: After the alkali-treated filament is taken out, it is first rinsed in deionized water to remove residual NaOH, then placed in 0.1% hydrochloric acid solution for 2 min to neutralize, then washed with deionized water until clean, and then dried at 100°C for 4 h to obtain dry microporous recycled polyester filament; The treatment parameters of the alkali treatment are as follows: NaOH concentration in the solution: (60–80) mmol / L; Processing temperature: (60~80)℃; Processing time: (20-50) min; Treatment liquor ratio: 1:20.

[0020] In the process of preparing microporous polyester filaments, the polyester chips are modified by using silane coupling agents. The protective effect of the silane coupling agents on the polyester chips increases their acid and alkali resistance. As a result, during the alkali treatment process, only the alkali-soluble polyester portion is dissolved, and the polyester portion is not damaged, thus ensuring the strength and other physical properties of the polyester filaments.

[0021] Furthermore, the fineness of the thermochromic polyester filament and the microporous recycled polyester filament is (50-75)D, the fineness of the SORONA filament is (30-50)D, and the fineness of the modified aramid fiber yarn is (40-60)S.

[0022] Compared with the prior art, the advantages of the present invention are as follows: The environmentally friendly ultra-soft wrapping yarn of the present invention has the following advantages: (1) This invention utilizes the properties of the yarn in each layer of the multi-layer structure to make the yarn have multiple functions. The microporous structure of the yarn core not only makes the yarn softer, but also makes the yarn more moisture-absorbing and moisture-wicking. The first wrapping yarn uses thermochromic polyester filament, which can make the yarn present different colors with the change of temperature, increasing the interest of the yarn. The SORONA filament of the core layer of the second wrapping yarn gives the yarn better softness, and the modified aramid fiber yarn of the outer layer gives the yarn better flame retardant properties. Both the first wrapping yarn and the second wrapping yarn are wrapped in a sparse and dense wrapping form, so that each layer of the yarn presents a state of being faintly visible. This form, combined with the thermochromic polyester filament, makes the appearance of the yarn more interesting.

[0023] (2) Because the molecular structure of aramid fibers is relatively strong, it is not easy for them to combine with other molecules or ions. This invention uses plasma treatment to create many free charges on the surface of aramid fibers, and also to form a nano-etching effect on the aramid fibers, increasing the possibility of molecules and ions combining with aramid fibers. Through grafting, flame retardants can be combined with aramid fibers, so that the flame retardant modifier can work together with aramid fibers to achieve a flame retardant effect, enhancing the flame retardant properties of aramid fibers, and thus giving the yarn a better flame retardant effect.

[0024] (3) In the process of preparing microporous polyester filament, the present invention modifies the polyester chips by using a silane coupling agent. The protective effect of the silane coupling agent on the polyester chips increases the acid and alkali resistance of the polyester chips, so that the polyester filament only dissolves the alkali-soluble polyester part during the alkali treatment process, and the polyester part is not damaged, thus ensuring the strength and other physical properties of the polyester filament.

[0025] (4) The present invention uses recycled polyester filament and SORONA filament to make the yarn more low-carbon, green and environmentally friendly. It uses thermochromic polyester filament to make the yarn dye-free and reduce dyeing pollution. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the yarn of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the second wrapping yarn of the present invention.

[0028] In the diagram, 1 is the yarn core; 2 is the first wrapped yarn; 3 is the second wrapped yarn; 4 is SORONA filament; and 5 is modified aramid fiber yarn. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The textual descriptions in this embodiment correspond to the accompanying drawings, and the descriptions involving orientation are also based on the descriptions in the accompanying drawings, and should not be construed as limiting the scope of protection of the present invention. Example 1

[0030] An environmentally friendly, ultra-soft wrapped yarn includes a core yarn 1, a first wrapped yarn 2, and a second wrapped yarn 3. The core yarn 1 is a microporous recycled polyester filament, and the first wrapped yarn 2 is a thermochromic polyester filament. The second wrapped yarn 3 consists of a core layer of SORONA filament 4 and modified aramid fiber yarn 5 wound on the SORONA filament 4. The modified aramid fiber is a para-aramid fiber treated with plasma grafting. The first wrapped yarn 2 is spirally wound around the outer layer of the core yarn 1 in a sparse-dense pattern, and the second wrapped yarn 3 is spirally wound around the outer layer of the first wrapped yarn 2 in a sparse-dense pattern. The wrapping twist of the first wrapped yarn 2 varies from 80 to 140 twists / 10cm, and the wrapping twist of the second wrapped yarn 3 varies from 70 to 160 twists / 10cm. The color-changing temperature of the thermochromic polyester filament is 28°C. When the ambient temperature is below 28°C, the color of the thermochromic polyester filament is gray; when the ambient temperature is 28°C or above, the color of the thermochromic polyester filament is white. The thermochromic polyester filament and the microporous recycled polyester filament both have a fineness of 50D, the SORONA filament has a fineness of 30D, and the modified aramid fiber yarn has a fineness of 60S.

[0031] This invention utilizes a multi-layered wrapping structure to fully leverage the properties of the yarn in each layer, giving the yarn multiple functionalities. The microporous structure of the yarn core 1 not only makes the yarn softer but also enhances its moisture absorption and wicking properties. The first wrapping yarn 2 uses thermochromic polyester filament, allowing the yarn to display different colors with temperature changes, adding visual interest. The SORONA filament core of the second wrapping yarn 3 provides better softness, while the outer modified aramid fiber yarn provides better flame retardant properties. Both the first wrapping yarn 2 and the second wrapping yarn 3 are wrapped in a spaced-dense pattern, creating a subtle, see-through effect between the yarn layers. This design, combined with the thermochromic polyester filament, makes the yarn's appearance even more interesting.

[0032] The preparation process of the modified aramid fiber is as follows: S1. Aramid fiber pretreatment: Aramid (Kevlar 29, manufactured by DuPont) fibers are immersed in a boiling water bath for 2 hours, then ultrasonically treated for 1 hour to remove the oil from the fiber surface, and subsequently dried at 45-55℃ for 4-6 hours; the dried aramid fibers are then treated in a plasma treatment device (DBD-100 dielectric barrier discharge plasma treatment machine) to obtain surface-activated aramid fibers. The specific parameters of the plasma device are as follows: Processing time: 5 minutes; Medium: A mixture of Ar and O2, wherein the volume ratio of Ar to O2 is 70:30; Processing power: 120W; Processing pressure: 60 Pa.

[0033] Because of the relatively strong molecular structure of aramid fibers, they are not easy to combine with other molecules or ions. Plasma treatment can give the surface of aramid fibers many free charges and can also form a nano-etching effect on the aramid fibers, increasing the possibility of molecules and ions combining with aramid fibers.

[0034] S2. Preparation of flame retardant modifier: Under nitrogen protection, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), melamine, and polyethylene glycol (PEG-400) were added to dimethylformamide reaction solvent in a molar ratio of 3:1:4 and reacted at 110°C for 2 hours to obtain a hydroxyl-containing phosphorus intermediate. Then, the solvent after reaction was cooled to 70°C, and 5% by mass of 2,4-diisocyanate toluene (TDI) was added as a coupling agent, followed by 0.8% by mass of triethylamine as a catalyst. The reaction was continued for 1.5 hours to obtain a phosphorus-nitrogen synergistic flame retardant modifier containing -NCO end groups.

[0035] S3. Grafting reaction: The surface-activated aramid fiber obtained in S1 is immersed in the flame-retardant modifier prepared in S2, so that the -NCO groups of the grafting agent react with the newly added -OH and -NH2 groups on the surface of the aramid fiber after plasma treatment in S1 to form a stable flame-retardant grafted layer, thereby obtaining flame-retardant grafted modified aramid fiber; the grafting reaction parameters are as follows: Reaction bath ratio: 1:20; Reaction temperature: 60℃ constant temperature; Reaction stirring speed: 50 r / min; Reaction time: 4 hours.

[0036] Grafting allows flame retardants to be combined with aramid fibers, enabling the flame retardant modifier to work together with the aramid fibers to achieve a flame retardant effect, thereby enhancing the flame retardant properties of the aramid fibers and giving the yarn a better flame retardant effect.

[0037] S4. Post-treatment: The flame-retardant grafted modified aramid obtained in S3 is washed 3-4 times with anhydrous ethanol (10 min each time) and 2-3 times with deionized water (8 min each time) to remove the ungrafted free modifier. Then it is dried in a vacuum drying oven at 80-90℃ for 2-3 hours to obtain modified aramid fiber with enhanced flame retardant effect.

[0038] The flame retardant properties of the modified aramid after the above treatment were measured according to GB / T 2406.2-2009 Determination of Combustion Behavior by Oxygen Index Method for Plastics - Part 2: Room Temperature Test. The vertical burning damage length was measured according to the method of vertical burning damage length, smoldering time and afterflame time for textile burning performance. The test results showed that the limiting oxygen index of the modified aramid fiber reached 40%, which was 20% higher than that before modification, and the vertical burning damage length was only 3cm, which was 50% higher than that before modification.

[0039] The method for preparing the microporous recycled polyester filament is as follows: (1) Preparation of modified polyester chips: 70-75 parts by weight of recycled polyester chips are crystallized and dried in sequence, and then blended and melted with 20-25 parts by weight of silane coupling agent, 1-3 parts by weight of dispersant and 1-2 parts by weight of antioxidant, and then fed into a screw mixing mechanism to produce modified polyester chips.

[0040] (2) Processing alkali-soluble polyester chips: The alkali-soluble polyester chips are subjected to crystallization treatment and drying treatment in sequence and then put into use.

[0041] (3) Preparation of recycled polyester filament: 85-90 parts by weight of modified polyester chips and 10-15 parts by weight of treated alkali-soluble polyester chips are evenly mixed and fed into the screw of a spinning machine. Recycled polyester filament is prepared through screw melting, drawing and drying processes.

[0042] (4) Preparation of microporous recycled polyester filament: I. Pretreatment: The recycled polyester filament prepared in step (3) is washed in deionized water at 45°C, then washed clean with cold water, and then dried in an oven for later use. II. Alkali treatment: During alkali treatment, the prepared treatment solution is first placed in a constant temperature water bath for 15 min to balance. When the temperature of the treatment solution reaches the set equilibrium temperature, the pretreated recycled polyester filament is then placed in the treatment for a certain period of time to dissolve the alkali-soluble polyester portion in the recycled polyester filament. III. Posttreatment: After the alkali-treated filament is taken out, it is first rinsed in deionized water to remove residual NaOH, then placed in 0.1% hydrochloric acid solution for 2 min to neutralize, then washed with deionized water until clean, and then dried at 100°C for 4 h to obtain dry microporous recycled polyester filament; The treatment parameters of the alkali treatment are as follows: NaOH concentration in the solution: (60–80) mmol / L; Processing temperature: (60~80)℃; Processing time: (20-50) min; Treatment liquor ratio: 1:20.

[0043] In the process of preparing microporous polyester filaments, the polyester chips are modified by using silane coupling agents. The protective effect of the silane coupling agents on the polyester chips increases their acid and alkali resistance. As a result, during the alkali treatment process, only the alkali-soluble polyester portion is dissolved, and the polyester portion is not damaged, thus ensuring the strength and other physical properties of the polyester filaments.

[0044] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. An environmentally friendly super-soft wrapped yarn characterized in that, It comprises a yarn core (1), a first wrapping yarn (2) and a second wrapping yarn (3), the yarn core (1) is a micro-porous regenerated polyester filament, the first wrapping yarn (2) is a thermochromic polyester filament; the second wrapping yarn (3) is composed of a SORONA filament (4) of the core layer and a modified aramid fiber yarn (5) wrapped on the SORONA filament (4), the modified aramid fiber is a para-aramid fiber treated by plasma-grafting; the first wrapping yarn (2) is spirally wrapped on the outer layer of the yarn core (1) in the form of dense and sparse intervals, and the second wrapping yarn (3) is spirally wrapped on the outer layer of the first wrapping yarn (2) in the form of dense and sparse intervals.

2. The environmentally friendly super-soft wrapped yarn according to claim 1, wherein, The preparation process of the modified aramid fiber is as follows: S1, aramid fiber pretreatment: the aramid fiber is soaked in a boiling water bath for 2 hours, then ultrasonic treated for 1 hour to remove the oil agent on the surface of the fiber, and then dried at 45-55℃ for 4-6 hours; the dried aramid fiber is treated in a plasma treatment device to obtain a surface-activated aramid fiber, and the specific parameters in the plasma device are as follows: Treatment time: 3-8 min; Medium: mixed gas of Ar and O2, wherein the volume ratio of Ar to O2 is (70-80):(20-30); Treatment power: 100-150 W; Treatment pressure: 50-80 Pa; S2, preparation of flame-retardant modifier: under the protection of nitrogen, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, melamine and polyethylene glycol are added into dimethylformamide reaction solvent in a molar ratio of 3:1:4, and reacted at 110℃ for 2 hours to prepare a phosphorus-based intermediate containing hydroxyl groups; then the reaction solvent is cooled to 70℃, 5% of 2,4-diisocyanate toluene based on the total mass of the reaction solvent is added as a coupling agent, and 0.8% of triethylamine based on the total mass of the reaction solvent is added as a catalyst, and the reaction is continued for 1.5 hours to prepare a phosphorus-nitrogen synergistic flame-retardant modifier containing -NCO end groups; S3, grafting reaction: the surface-activated aramid fiber prepared in S1 is immersed in the flame-retardant modifier prepared in S2, so that the -NCO groups of the grafting agent react with the -OH and -NH4 newly added to the surface of the aramid after S1 plasma treatment to form a stable flame-retardant grafting layer, and a flame-retardant grafting modified aramid is obtained; the grafting reaction parameters are as follows: Reaction bath ratio: 1:20; Reaction temperature: 60℃ constant temperature; Reaction stirring speed: 50 r / min; Reaction time: 4; S4, post-treatment: the flame-retardant grafting modified aramid obtained in S3 is washed with anhydrous ethanol for 3-4 times (10 min each time), and deionized water for 2-3 times (8 min each time) to remove the ungrafted free modifier, and then dried in a vacuum drying oven at 80-90℃ for 2-3 hours to obtain a modified aramid fiber with enhanced flame-retardant effect.

3. The environmentally friendly super-soft wrapped yarn according to claim 1, wherein, The wrapping twist of the first wrapping yarn (2) is 80-140 twists / 10 cm, and the wrapping twist of the second wrapping yarn (3) is 70-160 twists / 10 cm.

4. The environmentally friendly super-soft wrapped yarn according to claim 1, wherein, The thermochromic polyester filament has a color change temperature of 28 DEG C, and when the ambient temperature is below 28 DEG C, the thermochromic polyester filament has a color of gray, and when the ambient temperature is at or above 28 DEG C, the thermochromic polyester filament has a color of white.

5. The environmentally friendly super-soft wrapped yarn according to claim 1, wherein The preparation steps of the microporous regenerated polyester filament are as follows: I. Preparation of modified polyester chip: 70-75 parts by weight of regenerated polyester chip is sequentially subjected to crystallization and drying treatment, and then blended and melted with 20-25 parts by weight of silane coupling agent, 1-3 parts by weight of dispersing agent and 1-2 parts by weight of antioxidant, and then fed into a screw extruder to form a modified polyester chip; II. Treatment of alkali-soluble polyester chip: the alkali-soluble polyester chip is sequentially subjected to crystallization and drying treatment and then used; III. Preparation of regenerated polyester filament: 85-90 parts by weight of modified polyester chip is uniformly mixed with 10-15 parts by weight of treated alkali-soluble polyester chip, and then fed into a spinning machine screw, and then subjected to screw melting, spinning and drying processes to prepare a regenerated polyester filament; IV. Preparation of microporous regenerated polyester filament: I. Pretreatment: the regenerated polyester filament prepared in step III is washed in deionized water at 45 DEG C, and then washed with cold water, and then dried in an oven for standby. II. Alkali treatment: during the alkali treatment, the prepared treatment solution is placed in a constant temperature water bath for 15 min, and then the pretreated regenerated polyester filament is placed in the treatment solution for a certain time, so that the alkali-soluble polyester part in the regenerated polyester filament is dissolved. III. Post-treatment: after the alkali treatment, the filament is first washed in deionized water to remove residual NaOH, and then placed in 0.1% hydrochloric acid solution for 2 min, and then washed with deionized water until clean, and then dried at 100 DEG C for 4 h to obtain a dried microporous regenerated polyester filament; the treatment parameters of the alkali treatment are as follows: NaOH concentration in the solution: (60-80) mmol / L; Treatment temperature: (60-80) DEG C; Treatment time: (20-50) min; Treatment bath ratio: 1:

20.

6. The environmentally friendly super-soft wrapped yarn according to claim 1, wherein, The fineness of the thermochromic polyester filament and the microporous regenerated polyester filament is (50-75) D, the fineness of the SORONA filament is (30-50) D, and the fineness of the modified aramid fiber yarn is (40-60) S.

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