Super-soft cotton and linen fiber wrap yarn and preparation method thereof

Abstract

The invention discloses super-soft cotton and linen fiber wrap yarn and a preparation method thereof. The wrap yarn comprises core yarn made of nano-modified hemp fibers and cotton fibers which are tightly wrapped on the outer layer and subjected to special treatment. The preparation process specifically comprises the following steps: selecting high-quality China-hemp secondary crude fibers, performing degumming and opening treatment and impurity-removed fine falling short hemp fibers, preparing nano slurry, then pretreating cotton fibers, finally adopting a ring spinning coating process, feeding nano modified China-hemp fibers as core yarns, controlling tension through a drawing roller, and slowly feeding; cotton fibers serve as wrapping fibers, are controlled by the other set of roller system and spirally wrap the periphery of the core yarn at a certain twist degree. According to the prepared high-strength wear-resistant nano cotton and linen wrap yarn, the wear resistance of the wrap yarn is improved by about 30%-40% through nano silicon dioxide sizing treatment, and meanwhile the wrap yarn has the advantages of being antibacterial, soft, capable of absorbing moisture and releasing sweat, long in service life and the like by combining the characteristics of cotton fibers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new textile materials, and particularly relates to a super-soft cotton and hemp fiber covered yarn and a preparation method thereof. BACKGROUND

[0002] In the current textile industry, consumers are increasingly pursuing the functionality and comfort of fabrics. Although traditional cotton and hemp blended products combine the advantages of cotton fibers and hemp fibers to a certain extent, there is still room for improvement. On the one hand, with the development of science and technology, higher antibacterial requirements are put forward for textiles due to problems such as microbial pollution and odor breeding. On the other hand, ordinary blended yarns cannot fully meet the needs of high-end application scenarios such as medical and high-end sportswear in terms of yarn strength, wear resistance and delicate touch. The rise of nanotechnology brings opportunities for the improvement of textile materials. However, there is no mature and perfect solution in the industry to effectively apply nanotechnology to the hemp and cotton composite system to form a covered yarn with unique properties. There are many difficulties to be overcome in key links such as the fusion process of nanomaterials and natural fibers and the design of the covered structure in the prior art. SUMMARY

[0003] In view of the problems existing in the prior art, the present application provides a super-soft cotton and hemp fiber covered yarn and a preparation method thereof, which has super-strong antibacterial properties, excellent mechanical strength and delicate soft touch, and enhances wear resistance. A stable preparation process is developed to realize industrial production.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a super-soft cotton and hemp fiber covered yarn, comprising a core yarn of nano-modified hemp fiber and an outer layer of specially treated cotton fiber; the nano-modified hemp fiber is prepared by uniformly wrapping nano sizing material on the surface and internal pores of the hemp fiber; the nano-modified hemp fiber accounts for 20%-40% of the total weight of the yarn; and the cotton fiber is subjected to combing and mercerizing treatment, and accounts for 60%-80% of the total weight of the yarn.

[0005] A preparation method of a super-soft cotton and hemp fiber covered yarn, comprising the following steps: Step 1: select high-quality hemp two-rough fibers, and remove impurities from the short hemp fibers after degumming and opening treatment; prepare nano sizing material by adding polyvinyl alcohol (PVA) sizing material, polyacrylamide (PAM), wax sheet and nano silicon dioxide (silica sol) into a proper amount of distilled water, and then treating by ultrasonic dispersion to prepare uniform nano silicon dioxide polyethylene wax sizing material with a solid content of 12%-15%; Step 2: The treated short hemp fibers are immersed in a nanoparticle dispersion liquid, and ultrasonic-assisted immersion method is used to treat the hemp fibers under specific conditions (25 DEG C, 40 kHz) for 1-2 hours, so that the nanoparticles can fully penetrate and adsorb on the hemp fibers, and the hemp fibers are dried for 24 hours (25 DEG C, 65% humidity) to obtain the nano-modified hemp fibers; Step 3: Cotton fiber pretreatment: the cotton is subjected to opening and carding processes to remove impurities and short fibers and improve the fiber straightness; the cotton fibers are subjected to mercerization under specific conditions (20%-24% caustic soda concentration, 25 DEG C) for 1-2 minutes, and then neutralized and washed to neutral, so that the fiber surface is smooth, the gloss is improved, and the hand feeling is soft; Step 4: Cover yarn preparation: the nano-modified hemp fibers are used as core yarns and fed slowly under the control of tension (16 cN-28 cN) by a drafting roller; the cotton fibers are used as outer wrapping fibers and are controlled by another roller system to be spirally wrapped around the core yarns at a certain twist; Step 5: Accurate control of the wrapping twist, the twist factor is set to 200-280 to ensure that the cotton fibers are tightly and uniformly wrapped without damaging the core yarn structure, and finally the nano hemp / cotton cover yarn with excellent performance is spun.

[0006] Further, in step 1, the mass ratio of each component of polyvinyl alcohol (PVA) sizing agent, polyacrylamide (PAM), wax sheet and nano-silicon dioxide (silica sol) is 20-25:0.1-0.2:0.5-0.8:3-5.

[0007] The beneficial effects of the present application are: through the above innovative scheme and fine implementation, the high-strength and wear-resistant nano cotton hemp cover yarn prepared by the present application has a wear resistance improved by about 30%-40% through nano-silicon dioxide sizing treatment, and has the characteristics of antibacterial, soft, moisture absorption and perspiration, long service life, etc. combined with the characteristics of cotton fibers. Meanwhile, the present application adopts ring spinning, the preparation process is simple, the production efficiency is high, the operation is convenient and accurate, the structure of the spun cover yarn is stable, the breaking strength is relatively high, the production cost is reduced, a new high-performance material selection is provided for the textile industry, and is expected to be widely applied in multiple frontier fields. DETAILED DESCRIPTION

[0008] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below through examples. However, it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the scope of the present application.

[0009] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0010] The super-soft cotton and hemp covered yarn of the present application has a core structure of nanometer modified hemp fibers as core yarn and a tightly covered outer layer of specially treated cotton fibers. The nanometer modified hemp fibers are obtained by uniformly coating the nanometer slurry on the surface and internal pores of the hemp fibers to significantly improve the wear resistance. The nanometer modified hemp fibers account for 20-40% of the total weight of the yarn. The outer layer of cotton fibers is subjected to combing and mercerizing to enhance the gloss and softness and accounts for 60-80% of the total weight of the yarn. This unique covered structure design utilizes the functionality of nanometer hemp and the cotton fiber to optimize the overall wearability of the yarn.

[0011] Example 1: Select high-quality hemp two-rough fibers, and remove impurities after degumming and opening treatment.

[0012] Prepare a uniform nanometer silicon dioxide polyethylene wax slurry by adding polyvinyl alcohol (PVA) slurry, polyacrylamide (PAM), wax sheet, and nanometer silicon dioxide (silica sol) to a proper amount of distilled water and treating with ultrasonic dispersion. The solid content is 12%, and the mass ratio of each component is 20:0.1:0.5:3.

[0013] Soak the treated short hemp fibers in the nanometer particle dispersion liquid and treat them for 1 hour under specific conditions (25℃, 40kHz) using ultrasonic assisted immersion method to promote the nanometer particles to fully penetrate and adsorb on the hemp fibers. Dry and balance for 24h (25℃, 65% humidity) to obtain nanometer modified hemp fibers.

[0014] Cotton fiber pretreatment: Remove impurities and short fibers and improve fiber straightness by opening and carding cotton.

[0015] Perform mercerizing by treating the cotton fibers under specific conditions (20%-24% caustic soda concentration, 25℃) for 1 min, then neutralize and wash to neutral to make the fiber surface smooth, increase the gloss, and feel soft.

[0016] Covered yarn preparation process: Use ring spinning covering process to feed the nanometer modified hemp fibers as core yarn by controlling the tension (16cN) of the drafting roller and feeding slowly. The cotton fibers are used as outer covering fibers and are controlled by another set of roller system to spiral around the core yarn at a certain twist.

[0017] The precise control of the coating twist, and the twist factor is set at 200, ensures that the outer cotton fiber is tightly and uniformly coated, and does not damage the core yarn structure, and finally spins out the nano hemp / cotton coated yarn with excellent performance.

[0018] Example 2: Select high-quality hemp two-rough fibers, after degumming and opening treatment, remove the impurities of the short hemp fibers.

[0019] Configure the nano slurry, add polyvinyl alcohol (PVA) slurry, polyacrylamide (PAM), wax, nano silicon dioxide (silica sol) to the appropriate amount of distilled water, and prepare a uniform nano silicon dioxide polyethylene wax slurry after ultrasonic dispersion treatment, with a solid content of 13, and a mass ratio of each component of 23:0.15:0.6:4.

[0020] The treated short hemp fibers are immersed in the nano particle dispersion liquid, and treated for 1.5 hours under specific conditions (25°C, 40kHz) by ultrasonic assisted immersion method, so that the nano particles can fully penetrate and adsorb on the hemp fibers. After drying and balancing for 24h (25°C, 65% humidity), the nano modified hemp fibers are obtained.

[0021] Cotton fiber pretreatment: The cotton is subjected to opening and carding process to remove impurities and short fibers and improve the fiber neatness.

[0022] Silk processing is carried out, and the cotton fibers are treated under specific conditions (22% caustic soda concentration, 25°C) for 1.5min, then neutralized and washed to neutral, so that the fiber surface is smooth, the gloss is improved, and the hand feeling is soft.

[0023] Coated yarn preparation process: The nano modified hemp fibers are used as core yarn and fed slowly by controlling the tension (22cN) of the drafting roller, and the cotton fibers are used as outer wrapping fibers and controlled by another set of roller system to spiral wrap around the core yarn at a certain twist.

[0024] The precise control of the coating twist, and the twist factor is set at 240, ensures that the outer cotton fiber is tightly and uniformly coated, and does not damage the core yarn structure, and finally spins out the nano hemp / cotton coated yarn with excellent performance.

[0025] Example 3: Select high-quality hemp two-rough fibers, after degumming and opening treatment, remove the impurities of the short hemp fibers.

[0026] The nano slurry is configured, polyvinyl alcohol (PVA) slurry, polyacrylamide (PAM), wax sheet, nano silicon dioxide (silica sol) are added into appropriate amount of distilled water, and after ultrasonic dispersion treatment, a uniform nano silicon dioxide polyethylene wax slurry is prepared, the solid content is 15%, and the mass ratio of each component is 25:0.2:0.8:5.

[0027] The treated short hemp fibers are immersed in the nano particle dispersion liquid, and an ultrasonic assisted immersion method is used to treat the hemp fibers for 2 hours under specific conditions (25 DEG C, 40 kHz), so that the nano particles are fully penetrated and adsorbed on the hemp fibers, and the hemp fibers are dried and balanced for 24 hours (25 DEG C, 65% humidity), to obtain nano modified hemp fibers.

[0028] Cotton fiber pretreatment: The cotton is subjected to opening and carding processes to remove impurities and short fibers and improve the fiber straightness.

[0029] The silk processing is performed, the cotton fibers are treated for 2 minutes under specific conditions (24% caustic soda concentration, 25 DEG C), then neutralized and washed to neutral, so that the fiber surface is smooth, the gloss is improved, and the hand feeling is soft.

[0030] Cover yarn preparation process: The nano modified hemp fibers are used as core yarn and fed slowly by controlling the tension (28 cN) of the drafting roller through ring spinning cover process; the cotton fibers are used as outer covering fibers and are controlled by another set of roller system to spiral around the core yarn at a certain twist.

[0031] The cover twist is accurately controlled, and the twist factor is set to 280 to ensure that the cotton fibers are tightly and uniformly covered without damaging the core yarn structure, and finally the nano hemp / cotton cover yarn with excellent performance is spun.

[0032] In the whole preparation process, the environmental conditions are strictly controlled to minimize fiber damage and static generation, and the yarn quality stability and consistency are ensured to meet the stringent requirements of high-end textile products on raw materials.

[0033] Through the above innovative scheme and fine implementation, the high-strength and wear-resistant nano cotton and hemp cover yarn prepared by the application has an improved wear resistance of about 30%~40% through nano silicon dioxide sizing treatment, and has the characteristics of antibacterial, softness, moisture absorption and perspiration, long service life and the like in combination with the characteristics of cotton fibers. Meanwhile, the application adopts ring spinning, the preparation process is simple, the production efficiency is high, the operation is convenient and accurate, the structure of the spun cover yarn is stable, the breaking strength is relatively high, the production cost is reduced, a new high-performance material selection is provided for the textile industry, and the application is expected to be widely applied in multiple frontier fields.

[0034] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement or improvement made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A super-soft cotton-linen fiber covering yarn, characterized by, The application relates to a nano-modified hemp fiber core yarn and a tightly wrapped special cotton fiber outer layer; the nano-modified hemp fiber is prepared by uniformly wrapping nano slurry on the surface and internal pores of hemp fibers; the nano-modified hemp fiber accounts for 20%-40% of the total weight of the yarn; the cotton fiber is subjected to combing and mercerization treatment and accounts for 60%-80% of the total weight of the yarn.

2. A process for the production of super-soft cotton-linen fibre covering yarn, characterized in that, The application comprises the following steps: Step 1: high-quality hemp two-rough fibers are selected, degumming and opening treatment is carried out, and impurity-removed fine hemp fibers are obtained; nano slurry is configured, polyvinyl alcohol (PVA) slurry, polyacrylamide (PAM), wax sheets and nano silicon dioxide (silica sol) are added into appropriate distilled water, ultrasonic dispersion treatment is carried out, and uniform nano silicon dioxide polyethylene wax slurry is prepared, with a solid content of 12%-15%; Step 2: the treated short hemp fibers are immersed in the nano particle dispersion liquid, ultrasonic-assisted immersion treatment is carried out under specific conditions (25 DEG C, 40 kHz) for 1-2 hours, the nano particles are fully penetrated and adsorbed on the hemp fibers, and drying balance is carried out for 24 hours (25 DEG C, 65% humidity), so that the nano-modified hemp fibers are obtained; Step 3: cotton fiber pretreatment: the cotton is subjected to opening and scutching and combing processes, impurities and short fibers are removed, and the fiber regularity is improved; Mercerization treatment is carried out, the cotton fibers are treated under specific conditions (20%-24% caustic soda concentration, 25 DEG C) for 1-2 minutes, then neutralization and washing are carried out until the fibers are neutral, the fiber surface is smooth, the glossiness is improved, and the hand feeling is soft; Step 4: coated yarn preparation, the nano-modified hemp fibers are used as the core yarn and fed in slowly through the tension control (16 cN-28 cN) of the drafting roller; the cotton fibers are used as the outer wrapping fibers and are controlled by another set of roller systems to be spirally wrapped around the core yarn at a certain twist; Step 5: accurate control of the wrapping twist, the twist factor is set to be 200-280, the cotton fibers are tightly and uniformly wrapped, the core yarn structure is not damaged, and finally the nano hemp / cotton coated yarn with excellent performance is spun.

3. A process for the preparation of super-soft cotton-linen fibre covering yarn as claimed in claim 1, wherein, In step 1, the mass ratio of the polyvinyl alcohol (PVA) slurry, the polyacrylamide (PAM), the wax sheets and the nano silicon dioxide (silica sol) is 20-25:0.1-0.2:0.5-0.8:3-5.