Polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric and preparation method thereof

Abstract

The invention provides a polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric and a preparation method thereof, and belongs to the technical field of fabrics. Polylactic acid long fibers, combed long stapled cotton yarns and antibacterial spandex are combined, a double-sided circular knitting machine is adopted for weaving, grey cloth is woven according to a designed organization structure, the grey cloth is subjected to pre-shaping, hair removal through cellulase, dyeing through reactive dye and disperse dye, liquid ammonia finishing is conducted after drying is conducted through loose drying equipment, and the antibacterial fabric is obtained. During shaping, soft oil finishing and preshrinking finishing are carried out, and the polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric is prepared. The polylactic acid fiber is combined with high-quality cotton yarn and antibacterial spandex, and meanwhile, the polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric is prepared through the special design of a weaving method and the working procedures of enzyme washing treatment, liquid ammonia treatment, silicone oil treatment and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and in particular to an environmentally friendly, skin-friendly, naturally antibacterial double-layer fabric made of polylactic acid material and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards, people not only have high requirements on the appearance of clothes, but also have great demands on their texture and wearing performance.

[0003] Polylactic acid (PLA) is a new type of bio-based and renewable biodegradable material, made from starch raw materials from renewable plant resources (such as corn, cassava, etc.). Starch raw materials are saccharified to obtain glucose, which is then fermented with glucose and certain strains of bacteria to produce high-purity lactic acid, and then synthesized into polylactic acid of a certain molecular weight through chemical synthesis. It has good biodegradability and can be completely degraded by microorganisms in nature under specific conditions after use, eventually generating carbon dioxide and water without polluting the environment. This is very beneficial to protecting the environment and is a recognized environmentally friendly material.

[0004] Physical properties of polylactic acid materials:

[0005] Density 1.25g / cm 3 ;

[0006] Glass transition temperature: 55-65℃;

[0007] Melting temperature: 160-170℃

[0008] Since polylactic acid fiber is not resistant to acid and alkali, high humidity and is easily damaged during the dyeing and finishing process, special design and research of the dyeing and finishing process is required during the production process to solve the quality risks in dyeing and finishing.

[0009] Cotton fiber knitted fabrics are widely used in sports, leisure, underwear and knitted shirts. They are comfortable, breathable and elastic. The main problems of cotton fiber knitted fabrics are poor dimensional stability, large shrinkage and poor washability. These problems affect the wearing performance of pure cotton knitted products.

[0010] Antibacterial spandex adopts nano-scale silver ion carrier technology, adding nano-scale silver ion particles (Ag + ), which makes spandex have lasting antibacterial function. Summary of the invention

[0011] The purpose of the present invention is to propose an environmentally friendly, skin-friendly and naturally antibacterial double-layer fabric made of polylactic acid material and a preparation method thereof, so as to provide an environmentally friendly, skin-friendly and naturally antibacterial high-end fabric. At the same time, the product has the characteristics of silky luster, soft hand feel, excellent drape, cotton feel, comfort and skin-friendliness.

[0012] The present invention is achieved through the following technical solutions:

[0013] Raw materials: The front layer of the fabric is made of 40-60 combed long-staple cotton yarn, with a cotton fiber length of 37mm or more, a twist coefficient of 3.5, and the spinning method is compact siro spinning;

[0014] The reverse layer of the fabric is made of 75D / 72F-100D / 144F polylactic acid filament.

[0015] The middle layer of the fabric is made of 20D-40D spandex yarn, and the spandex yarn is antibacterial spandex.

[0016] Weaving equipment: Double-sided weft knitting machine with a machine gauge of 24-32 needles / inch

[0017] Weaving process: The double-sided weft knitting machine uses No. 1 needle and No. 2 needle to alternately arrange the needles. The weaving method is as follows:

[0018] The first yarn is looped with the No. 1 needle of the upper needle disk, and is looped with the No. 2 needle of the upper needle disk. The first yarn is looped with combed long-staple cotton yarn, and the process is repeated to obtain the front side of the knitted fabric.

[0019] The second yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The second yarn is looped with polylactic acid fiber filaments, and the process is repeated to obtain the reverse side of the knitted fabric.

[0020] The third yarn is tucked with the No. 1 needle of the upper cylinder and the No. 1 needle of the lower cylinder, and the third yarn is made of antibacterial spandex, and the process is repeated to obtain the middle connecting layer of the knitted fabric;

[0021] The fourth yarn is looped with the No. 1 needle of the upper needle disk and the No. 2 needle of the upper needle disk, and the fourth yarn is looped with the combed long-staple cotton yarn, and the process is repeated to obtain the front side of the knitted fabric;

[0022] The fifth yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The fifth yarn is looped with polylactic acid fiber filaments, and the process is repeated to obtain the reverse side of the knitted fabric.

[0023] The sixth yarn is tucked together with the No. 2 needle of the upper syringe and the No. 2 needle of the lower syringe. The sixth yarn is made of antibacterial spandex. The process is repeated to obtain the middle connecting layer of the knitted fabric.

[0024] Yarn arrangement and yarn length:

[0025] The first and fourth cotton yarns have a yarn length of 13-16cm / 50 coils;

[0026] The second and fifth polylactic acid yarns have a yarn length of 13-16cm / 50 coils;

[0027] The third and sixth antibacterial spandex connecting yarns have a yarn length of 6-10cm / 50 coils.

[0028] After the blank is woven, the following production steps are included:

[0029] Knitting - fabric preparation - opening - pre-setting - scouring - enzyme washing - dyeing polylactic acid - dyeing cotton - dehydration - loose drying - liquid ammonia finishing - continuous washing machine washing - setting (softening oil) - pre-shrinking;

[0030] Pre-molding process:

[0031] The woven fabric is pre-formed at a pre-forming temperature of 180°C, a machine speed of 22 m / min, and an effective air volume of 60% in the oven.

[0032] The specific process conditions of the pretreatment + biological enzyme are:

[0033] In-cylinder pre-treatment:

[0034] Degreasing agent 3g / L; Soda ash 1.5g / L; Penetrant SKS 0.25g / L; Dispersant 1.5g / L; H2O2 (27.5%), 3g / L; 85℃, 30min.

[0035] Bio-enzyme washing process:

[0036] The fabric is placed in the enzyme washing solution at a bath ratio of 1:18-40, and treated at a temperature of 40-60°C for 40-80 minutes; the pH value of the enzyme washing solution is 4-6.5; the dosage is: 1-2g / L neutral enzyme, 0.5-1.0g / L sodium acetate and 0.2g / L acetic acid, and the solvent is water;

[0037] The process flow of fabrics is: dyeing with polylactic acid → reduction cleaning → dyeing with cotton → soaping → color fixing treatment;

[0038] The process of dyeing polylactic acid filaments is:

[0039] Dye: 0.5-3%; dispersing and leveling agent 1.5-2g / L; glacial acetic acid or buffered acid, adjust pH to 4-5; 110℃, 30min; Note: Dispersing dyes should be low-temperature, small molecule dyes, such as: Disperse Yellow ACE series, polyester low-temperature brightener.

[0040] Reactive dyeing process for dyed cotton fibers, such as Figure 1 The dyeing formula is 1.5-4% dye, 90g / L sodium sulfate, and 20g / L soda ash.

[0041] Soaping formula: Soaping agent 1g / L.

[0042] Note: 1) When removing oil from the cylinder, the pH value of the working fluid cannot exceed 10; caustic soda, substitute alkali, refining enzyme or other strong alkali cannot be used;

[0043] 2) The pH value of the dyeing working solution ranges from 4 to 5; the dyeing temperature cannot exceed 110°C, and the disperse dyes should be low-temperature type and small molecules, such as disperse yellow ACE series, polyester low-temperature brightener;

[0044] 3) The pre-setting temperature of the grey cloth cannot exceed 195℃, and the effective air volume of the oven is 60%; the setting temperature cannot exceed 140℃.

[0045] Liquid ammonia mercerization:

[0046] Ammonia is below -33℃, and the dyed cloth is passed through the liquid ammonia treatment box with a cloth guide; the speed is 20-28 m / min, the temperature is: inlet blanket: 110-125℃, upper and lower reaction zone: 85-95℃, outlet blanket: 95-105℃, tension is: inlet blanket: 2-2.5kg upper and lower reaction zone: 4-6kg, outlet blanket: 4-6kg. Liquid ammonia finishing is to set the ammonia below -33℃ to make it liquid. At this time, the viscosity and surface tension of liquid ammonia are much lower than water, so that liquid ammonia can easily and quickly enter the cotton fiber, causing the cotton fiber to expand from the core, the cross section expands from flat to round, the cavity becomes smaller, and the surface is smooth. Due to the change of the fiber crystal structure, the internal stress is eliminated and it is no longer twisted, thereby improving the tensile strength and tear strength, and then achieving the fabric after repeated washing. Still maintain a good feel.

[0047] In the actual practice, the machine cannot be stopped during liquid ammonia mercerization treatment. If it is stopped, it will cause color abnormalities and affect the performance of the fabric. If it is stopped, it needs to be marked.

[0048] The washing process is a process of cleaning the fabric after liquid ammonia treatment. It is carried out under the above-mentioned parameter conditions and is the result of long-term research and development by the staff. If it is not carried out under the above-mentioned parameter conditions, the fabric may be broken or stained with oil.

[0049] Drying: After dyeing and continuous washing machine washing, loose drying method is adopted. This is because the fabric shrinks greatly in the warp direction due to the large tensile tension in the dye vat. Loose drying can release the internal stress of the fabric caused by the warp tension, thereby achieving the effect of stabilizing shrinkage.

[0050] Setting: Place the fabric in a setting finishing liquid at 130°C for 3-10 minutes, wherein the setting finishing liquid contains 60-100g / L of softener D6100 and 1-2g / L of penetrant, the solvent is water, and the vehicle speed is 16-22m / min.

[0051] The setting finishing liquid using the above components can make the surface of the fabric smooth and not deformed. The softener is ice-feeling silicone oil, which can improve the softness and smoothness of the fabric and the icy touch after use.

[0052] Preshrinkage: Use a felt-type preshrinkage machine with a speed of 15-25m / min.

[0053] The present invention has the following beneficial effects:

[0054] The invention carries out special designs in raw material design and use, fabric structure design, dyeing process design and post-finishing process design, and the product has good performance and creativity.

[0055] Liquid ammonia finishing: Since liquid ammonia (NH3) is used to treat fabrics, liquid ammonia (NH3) has physical and chemical properties such as small molecular weight and strong molecular polarity. When cotton fibers are mercerized with liquid ammonia, liquid ammonia can quickly and evenly penetrate into the structure of cotton fibers, break up the hydrogen bonds between fiber macromolecules, rearrange fiber macromolecules, reduce fiber crystallinity, and eliminate some of the fiber's own internal stress; after liquid ammonia enters the fiber, it expands the fiber, and the cross-section of the cotton fiber changes from a round shape to a nearly round shape. When the liquid ammonia is heated and vaporized, the cotton fiber maintains a nearly round cross-section, which improves the surface gloss of the fiber. After cotton fabrics are mercerized with liquid ammonia, the overall gloss of the fabric can be improved, and the feel is softer than before liquid ammonia finishing.

[0056] This patent combines polylactic acid fiber filaments, high-quality combed long-staple cotton yarn and antibacterial spandex, and through special weaving design, as well as enzyme washing treatment, liquid ammonia treatment, silicone oil treatment and other processes, it is made into an environmentally friendly, skin-friendly and naturally antibacterial double-layer fabric made of polylactic acid material.

[0057] The present invention provides a polylactic acid material environmentally friendly skin-friendly natural antibacterial double-layer fabric and a preparation method thereof. The polylactic acid fiber used is combined with other materials and various post-treatments are performed to achieve the following beneficial effects:

[0058] 1. Give full play to the skin-friendly, comfortable and healthy wearing experience of polylactic acid materials, while achieving good natural antibacterial function.

[0059] 2. Polylactic acid material comes from nature, has natural degradation function, and is beneficial to environmental protection.

[0060] 3. Solve the problem of difficulty in dyeing polylactic acid products and provide the market with a home leisure and high-end business leisure knitted T-shirt fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0062] Figure 1 The present invention is a flow chart of the cotton dyeing active dyeing process. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] Embodiment 1:

[0065] JC50S compact spinning + 30D spandex + 75D / 72F PLA DTY C5SPLA40SPS E28*3050C-14.5 / 4.5 / 14.5;

[0066] Raw materials: The front layer of the fabric is made of 50-ne combed long-staple cotton yarn, with a cotton fiber length of 37mm and above, a twist coefficient of 3.5, and the spinning method is compact siro spinning;

[0067] The back layer of the fabric is made of 75D / 72F fine denier polylactic acid fiber filament.

[0068] The middle layer of the fabric is made of 30D spandex, and the spandex yarn is antibacterial spandex.

[0069] Weaving equipment: 28 needles / 34 inches double-sided weft knitting machine

[0070] Weaving process:

[0071] The double-sided weft knitting machine uses No. 1 needle and No. 2 needle to alternately arrange the needles. The knitting method is as follows:

[0072] The first yarn is looped with the No. 1 needle of the upper needle disk, and is looped with the No. 2 needle of the upper needle disk. The first yarn is looped with cotton yarn, and the process is repeated to obtain the front side of the knitted fabric.

[0073] The second yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The second yarn is looped with polylactic acid long-fiber yarn, and the process is repeated to obtain the reverse side of the knitted fabric.

[0074] The third yarn is tucked with the No. 1 needle of the upper cylinder and the No. 1 needle of the lower cylinder, and the third yarn is made of antibacterial spandex, and the process is repeated to obtain the middle connecting layer of the knitted fabric;

[0075] The fourth yarn is looped with the No. 1 needle of the upper needle disk, and is looped with the No. 2 needle of the upper needle disk. The fourth yarn is looped with cotton yarn, and the process is repeated to obtain the front side of the knitted fabric.

[0076] The fifth yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The fifth yarn is looped with polylactic acid long-fiber yarn, and the process is repeated to obtain the reverse side of the knitted fabric.

[0077] The sixth yarn is tucked together with the No. 2 needle of the upper syringe and the No. 2 needle of the lower syringe. The sixth yarn is made of antibacterial spandex, and the middle connecting layer of the knitted fabric is obtained by repeated weaving.

[0078] Yarn arrangement and yarn length:

[0079] The first and fourth combed long-staple cotton yarns have a yarn length of 14.5cm / 50 turns;

[0080] The second and fifth polylactic acid fiber filaments have a yarn length of 14.5 cm / 50 coils;

[0081] The third and sixth antibacterial spandex connecting yarns have a yarn length of 8 cm / 50 stitches.

[0082] The double-layer triangle diagram of polylactic acid spandex is shown in Table 1.

[0083] Table 1

[0084]

[0085] After the blank is woven, the following production steps are included:

[0086] Knitting - fabric preparation - opening - pre-setting - scouring - enzyme washing - dyeing polylactic acid - dyeing cotton - dehydration - loose drying - liquid ammonia finishing - continuous washing machine washing - setting (softening oil) - pre-shrinking;

[0087] Pre-setting process: arrange the woven fabric for pre-setting at 180℃, 22m / min, and the effective air volume of the oven is 60%.

[0088] The specific process conditions of the pretreatment + biological enzyme are:

[0089]

[0090] Bio-enzyme washing process:

[0091] The fabric was placed in the enzyme washing solution at a bath ratio of 1:40 and treated at 60°C for 80 minutes; the pH value of the enzyme washing solution was 6.5; the dosage was: 2g / L neutral enzyme, 1.0g / L sodium acetate and 0.2g / L acetic acid, and the solvent was water;

[0092] The process flow of dyeing polylactic acid and cotton is as follows:

[0093] Dyeing polylactic acid → reduction cleaning → dyeing cotton → soaping → color fixing treatment;

[0094] The dyeing process of polylactic acid is:

[0095] Staining dye: 0.5%;

[0096] Dispersing and leveling agent 2g / L;

[0097] Adjust pH to 4 with glacial acetic acid or buffered acid;

[0098] 110℃, 30min.

[0099] Note: Disperse dyes should be low-temperature, small molecule dyes, such as Disperse Yellow ACE series, polyester low-temperature brighteners.

[0100] Reactive dyeing process for cotton dyeing Figure 1 :

[0101] Cotton dyeing formula: dye 1.5%, sodium sulfate 90g / L, soda ash 20g / L.

[0102] Soaping formula: Soaping agent 1g / L

[0103] Note: 1) When removing oil from the cylinder, the pH value of the working fluid cannot exceed 10; caustic soda, substitute alkali, refining enzyme or other strong alkali cannot be used;

[0104] 2) The pH value range of the dyeing working solution is 4; the dyeing temperature cannot exceed 110°C, and the disperse dyes should be low-temperature type and small molecules, such as: Disperse Yellow ACE series, polyester low-temperature brightener;

[0105] 3) The pre-setting temperature of the grey cloth cannot exceed 185℃, and the effective air volume of the oven is 60%; the setting temperature cannot exceed 140℃.

[0106] Ammonia is below -33℃, and the dyed cloth is passed through the liquid ammonia treatment box using a cloth guide; the speed is 28 meters / min, the temperature is: inlet blanket: 125℃, upper and lower reaction zone: 95℃, outlet blanket: 95-105℃, and the tension is: inlet blanket: 2.5kg, upper and lower reaction zone: 6kg, outlet blanket: 6kg. Liquid ammonia finishing is to set the ammonia below -33℃ to make it liquid. At this time, the viscosity and surface tension of liquid ammonia are much lower than those of water, so that liquid ammonia can easily and quickly enter the cotton fiber, causing the cotton fiber to expand from the core, the cross section expands from flat to round, the cavity becomes smaller, and the surface is smooth. Due to the change in the fiber crystal structure, the internal stress is eliminated and it no longer twists, thereby improving the tensile strength and tear strength, and then achieving the fabric still maintains a good feel after repeated washing.

[0107] In the actual practice, the machine cannot be stopped during liquid ammonia mercerization treatment. If it is stopped, it will cause color abnormalities and affect the finishing performance of the fabric. If it is necessary to stop the machine, it needs to be marked.

[0108] The washing process is a process of cleaning the fabric after liquid ammonia treatment. It is carried out under the above-mentioned parameter conditions and is the result of long-term research and development by the staff. If it is not carried out under the above-mentioned parameter conditions, the fabric may be broken or stained with oil.

[0109] Drying: After dyeing nylon and washing in a continuous washing machine, loose drying is used. The main function is that the fabric is subjected to a large tensile tension in the dyeing vat, and the warp shrinkage will also be relatively large. Drying can release the internal stress caused by the warp tension of the fabric, thereby achieving the effect of stabilizing shrinkage.

[0110] Setting: placing the fabric in a setting finishing liquid and treating it at 140° C. for 10 minutes, wherein the setting finishing liquid comprises 60 g / L of a resin finishing agent, 15 g / L of a catalyst, 100 g / L of a softener D6100 and 2 g / L of a penetrant, the solvent is water, and the vehicle speed is 22 m / min.

[0111] The setting finishing liquid using the above components can make the surface of the fabric smooth and not deformed, mainly because the resin finishing agent is used, which mainly plays the role of reducing shrinkage or improving the washing resistance of the fabric. After multiple washings, the surface can still be smooth and not deformed. In addition, the softener used is ice-feeling silicone oil, which can improve the softness and smoothness of the fabric and the ice-feeling soft oil after practical use.

[0112] Preshrinkage: Use a felt-type preshrinkage machine with a speed of 25m / min.

[0113] Through the above process, the product is obtained, and the fabric weight is 200g / m 2, weight deviation is within + / -3%, size change after washing is controlled within -5%, and fabric thickness is controlled within 1.5-1.8mm.

[0114] Embodiment 2:

[0115] Raw materials: The front layer of the fabric is made of 40-ne combed long-staple cotton yarn, the cotton fiber length of the cotton yarn is 37mm or above, the twist coefficient is 3.5, and the spinning method is compact siro spinning;

[0116] The reverse layer of the fabric is made of 75D / 72F polylactic acid filament.

[0117] The middle layer of the fabric is made of 30D spandex, and the spandex yarn is antibacterial spandex.

[0118] Weaving equipment: 28 needles / 34 inches double-sided weft knitting machine

[0119] Weaving process:

[0120] The double-sided weft knitting machine uses No. 1 needle and No. 2 needle to alternately arrange the needles. The knitting method is as follows:

[0121] The first yarn is looped with the No. 1 needle of the upper needle disk, and is looped with the No. 2 needle of the upper needle disk. The first yarn is looped with combed long-staple cotton yarn, and the process is repeated to obtain the front side of the knitted fabric.

[0122] The second yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The second yarn is looped with polylactic acid fiber filaments, and the process is repeated to obtain the reverse side of the knitted fabric.

[0123] The third yarn is tucked with the No. 1 needle of the upper cylinder and the No. 1 needle of the lower cylinder, and the third yarn is made of antibacterial spandex, and the process is repeated to obtain the middle connecting layer of the knitted fabric;

[0124] The fourth yarn is looped with the No. 1 needle of the upper needle disk and the No. 2 needle of the upper needle disk, and the fourth yarn is looped with the combed long-staple cotton yarn, and the process is repeated to obtain the front side of the knitted fabric;

[0125] The fifth yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The fifth yarn is looped with polylactic acid fiber filaments, and the process is repeated to obtain the reverse side of the knitted fabric.

[0126] The sixth yarn is tucked together with the No. 2 needle of the upper syringe and the No. 2 needle of the lower syringe. The sixth yarn is made of antibacterial spandex, and the middle connecting layer of the knitted fabric is obtained by repeated weaving.

[0127] Yarn arrangement and yarn length:

[0128] The first and fourth combed long-staple cotton yarns have a yarn length of 15cm / 50 turns;

[0129] The second and fifth polylactic acid fiber filaments have a yarn length of 15cm / 50 coils;

[0130] The third and sixth antibacterial spandex yarns have a yarn length of 8cm / 50 coils.

[0131] The double-layer triangle diagram of polylactic acid spandex is shown in Table 2.

[0132] Table 2

[0133]

[0134] After the blank is woven, the following production steps are included:

[0135] Knitting - fabric preparation - opening - pre-setting - scouring - enzyme washing - dyeing polylactic acid - dyeing cotton - dehydration - loose drying - liquid ammonia finishing - continuous washing machine washing - setting (softening oil) - pre-shrinking;

[0136] Pre-forming process: Pre-forming at 180°C, 22m / min, effective air volume of oven 60%.

[0137] The specific process conditions of the pretreatment + biological enzyme are:

[0138]

[0139] Bio-enzyme washing process:

[0140] The fabric was placed in the enzyme washing solution at a bath ratio of 1:18 and treated at a temperature of 40°C for 40 minutes; the pH value of the enzyme washing solution was 4; the dosage was: 1g / L neutral enzyme, 0.5g / L sodium acetate and 0.2g / L acetic acid, and the solvent was water;

[0141] The process flow of dyeing polylactic acid and cotton is as follows:

[0142] Dyeing polylactic acid → reduction cleaning → dyeing cotton → soaping → color fixing treatment;

[0143] The dyeing process of polylactic acid is:

[0144] Staining dye: 3%

[0145] Dispersing and leveling agent 1.5g / L

[0146] Glacial acetic acid or buffered acid to adjust pH to 5

[0147] 110℃,30min

[0148] Note: Disperse dyes should be low-temperature, small molecule dyes, such as Disperse Yellow ACE series, polyester low-temperature brighteners.

[0149] Reactive dyeing process for cotton dyeing Figure 1 ;

[0150] Cotton dyeing formula: dye 4%, sodium sulfate 90g / L, soda ash 20g / L.

[0151] Soaping formula: Soaping agent 1g / L

[0152] Note: 1) When removing oil from the cylinder, the pH value of the working fluid cannot exceed 10; caustic soda, substitute alkali, refining enzyme or other strong alkali cannot be used;

[0153] ) The pH value of the dyeing working solution is within the range of 5; the dyeing temperature cannot exceed 110°C, and the disperse dyes are low-temperature type and small molecules, such as disperse yellow ACE series, polyester low-temperature brightener;

[0154] 3) The pre-setting temperature of the grey cloth cannot exceed 185℃, and the effective air volume of the oven is 60%; the setting temperature cannot exceed 140℃.

[0155] Ammonia is below -33℃, and the dyed cloth is passed through the liquid ammonia treatment box using a cloth guide; the speed is 22 meters / min, the temperature is: inlet blanket: 120℃, upper and lower reaction zone: 90℃, outlet blanket: 100℃, and the tension is: inlet blanket: 2kg, upper and lower reaction zone: 5kg, outlet blanket: 5kg. Liquid ammonia finishing is to set the ammonia below -33℃ to make it liquid. At this time, the viscosity and surface tension of liquid ammonia are much lower than water, so that liquid ammonia can easily and quickly enter the cotton fiber, causing the cotton fiber to expand from the core, the cross section expands from flat to round, the cavity becomes smaller, and the surface is smooth. Due to the change in the fiber crystal structure, the internal stress is eliminated and it no longer twists, thereby improving the tensile strength and tear strength, and then achieving the fabric still maintains a good feel after repeated washing.

[0156] In the actual practice, the machine cannot be stopped during liquid ammonia mercerization treatment. If it is stopped, it will cause color abnormalities and affect the finishing performance of the fabric. If it is necessary to stop the machine, it needs to be marked.

[0157] The washing process is a process of cleaning the fabric after liquid ammonia treatment. It is carried out under the above-mentioned parameter conditions and is the result of long-term research and development by the staff. If it is not carried out under the above-mentioned parameter conditions, the fabric may be broken or stained with oil.

[0158] Drying: After dyeing nylon and washing in a continuous washing machine, loose drying is used. The main function is that the fabric is subjected to a large tensile tension in the dyeing vat, and the warp shrinkage will also be relatively large. Drying can release the internal stress caused by the warp tension of the fabric, thereby achieving the effect of stabilizing shrinkage.

[0159] Setting: placing the fabric in a setting finishing liquid and treating it at 140° C. for 7 minutes, wherein the setting finishing liquid comprises 45 g / L of a resin finishing agent, 10 g / L of a catalyst, 70 g / L of a softener D6100 and 1.5 g / L of a penetrant, the solvent is water, and the vehicle speed is 20 m / min.

[0160] The setting finishing liquid using the above components can make the surface of the fabric smooth and not deformed, mainly because the resin finishing agent is used, which mainly plays the role of reducing shrinkage or improving the washing resistance of the fabric. After multiple washings, the surface can still be smooth and not deformed. In addition, the softener used is ice-feeling silicone oil, which can improve the softness and smoothness of the fabric and the ice-feeling soft oil after practical use.

[0161] Preshrinkage: Use a felt-type preshrinkage machine with a speed of 20m / min.

[0162] Through the above process, the product is obtained, and the fabric weight is 220g / m 2 , the weight deviation is within + / -3%, the size change after washing is controlled within -5%, and the fabric thickness is controlled within 1.8-2mm.

[0163] The obtained finished product was subjected to conventional physical and chemical index tests, and the test results are shown in Table 3 below:

[0164] Table 3

[0165]

[0166] It can be seen from the above table that the environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric made of polylactic acid material prepared in Examples 1-2 of the present invention has good comprehensive performance.

[0167] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A polylactic acid material environmentally friendly skin-friendly natural antibacterial double-layer fabric, characterized in that: A combination of polylactic acid fiber filament, combed long-staple cotton yarn and antibacterial spandex is adopted, and a double-sided large circular machine is used for weaving. A three-layer grey cloth is woven according to the designed organizational structure. The grey cloth is pre-shaped, dehaired by cellulase, dyed with active dyes and disperse dyes, dried by loose drying equipment, and then finished with liquid ammonia. During the shaping, it is softened with oil and pre-shrunk to make a polylactic acid material environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric.

2. The environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric made of polylactic acid material according to claim 1 is characterized in that: The fabric comprises a fabric front layer, an intermediate connecting layer and a fabric bottom layer, wherein the fabric front layer is woven from combed long-staple cotton yarn; the fabric bottom layer is woven from polylactic acid fiber filaments; and the intermediate layer is woven from antibacterial spandex; During the weaving process, the fabric is woven by a double-sided weft knitting machine with a machine gauge of 24-32 needles / inch. The double-sided weft knitting machine uses No. 1 needles and No. 2 needles to alternately arrange needles, and is woven into a loop by combed long-staple cotton yarn, polylactic acid fiber filament yarn and antibacterial spandex.

3. The environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric made of polylactic acid material according to claim 2 is characterized in that: The front layer of the fabric is made of 40-60 combed long-staple cotton yarn, the cotton fiber length of the cotton yarn is 37 mm or more, the twist coefficient is 3.5, and the spinning method is compact siro spinning; the back layer of the fabric is made of 75D / 72F-100D / 144F polylactic acid fiber filament, and the middle layer of the fabric is made of 20D-40D antibacterial spandex yarn.

4. The environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric made of polylactic acid material according to claim 2 is characterized in that: The fabric includes the following weaving methods: The first yarn is looped with the No. 1 needle of the upper needle disk, and is looped with the No. 2 needle of the upper needle disk. The first yarn is looped with combed long-staple cotton yarn, and the process is repeated to obtain the front side of the knitted fabric. The second yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The second yarn is looped with polylactic acid fiber filaments, and the process is repeated to obtain the reverse side of the knitted fabric. The third yarn is tucked with the No. 1 needle of the upper cylinder and the No. 1 needle of the lower cylinder, and the third yarn is made of antibacterial spandex, and the process is repeated to obtain the middle connecting layer of the knitted fabric; The fourth yarn is looped with the No. 1 needle of the upper needle disk and the No. 2 needle of the upper needle disk, and the fourth yarn is looped with the combed long-staple cotton yarn, and the process is repeated to obtain the front side of the knitted fabric; The fifth yarn is looped with the No. 1 needle of the lower needle cylinder and the No. 2 needle of the lower needle cylinder. The fifth yarn is looped with polylactic acid fiber filaments, and the process is repeated to obtain the reverse side of the knitted fabric. The sixth yarn is tucked together with the No. 2 needle of the upper syringe and the No. 2 needle of the lower syringe. The sixth yarn is made of antibacterial spandex. The process is repeated to obtain the middle connecting layer of the knitted fabric.

5. The environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric made of polylactic acid material according to claim 4 is characterized in that: The first and fourth routes use combed long-staple cotton yarn with a yarn length of 13-16cm / 50 coils; The second and fifth routes are made of polylactic acid filaments, with a yarn length of 13-16cm / 50 coils; The third and sixth paths are made of antibacterial spandex, and the yarn length is 6-10cm / 50 coils.

6. A method for preparing the environmentally friendly, skin-friendly, natural and antibacterial double-layer fabric made of polylactic acid material as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Knitting - opening - pre-setting - scouring - enzyme washing - dyeing polylactic acid - dyeing cotton - dehydration - loose drying - liquid ammonia finishing - washing in continuous washing machine - setting - pre-shrinking.

7. The preparation method according to claim 6, characterized in that: The pre-setting process is as follows: the woven grey cloth is pre-set at 170-190° C., 20-25 m / min, and the effective air volume of the oven is 50-70%.

8. The preparation method according to claim 6, characterized in that: The enzyme washing process is as follows: the fabric is placed in the enzyme washing solution at a bath ratio of 1:18-40, and treated at a temperature of 40-60°C for 40-80 minutes; the pH value of the enzyme washing solution is 4-6.5; the dosage is: 1-2g / L neutral enzyme, 0.5-1.0g / L sodium acetate and 0.2g / L acetic acid, and the solvent is water.

9. The preparation method according to claim 6, characterized in that: The process flow of dyeing polylactic acid and dyeing cotton is as follows: Dyeing polylactic acid → reduction cleaning → dyeing cotton → soaping → color fixing treatment; The dyeing process of polylactic acid is as follows: dyeing, dye: 0.5-3%; dispersing leveling agent 1.5-2g / L; adjusting pH value to 4-5 with glacial acetic acid or buffered acid, 105-110°C, 20-40min.

10. The preparation method according to claim 6, characterized in that: The shaping process includes placing the fabric in a shaping finishing liquid and treating it at 130° C. for 3-10 minutes; the shaping finishing liquid contains 60-100 g / L of softener D6100 and 1-2 g / L of penetrant, the solvent is water, and the vehicle speed is 16-22 m / min.

Images