A heating fabric and its preparation method

Abstract

This invention provides a heat-generating fabric and its preparation method. The heat-generating fabric of this invention includes an outer layer, a middle layer, and an inner layer. The outer layer is a waterproof and windproof layer made of high-density woven fabric. The middle layer is an electrothermal layer containing heat-generating and conductive materials. The inner layer is a skin-moisturizing layer made of double-sided mesh textured fabric. The outer and inner layers are compositely connected through the middle layer. This invention's heat-generating fabric is an electrothermal fabric with significant heating effect, good warmth retention, and can be reused multiple times. The temperature can be freely set as needed and can be quickly heated to the desired temperature. The inner layer, being a skin-moisturizing layer, contains hyaluronic acid and has a moisturizing function. The fabric is breathable and moisture-wicking, keeping the wearer dry and comfortable. It provides warmth in cold winters and effectively wicks away sweat during exercise, providing effective skin protection.

Description

Technical Field

[0001] This invention belongs to the field of textile fabric technology, specifically relating to a heat-generating fabric and its preparation method. Background Technology

[0002] As society enters the era of intelligent technology, people have increasingly higher demands for quality of life. In the cold winter, people are no longer simply looking for warmth, but are paying more attention to health and aesthetics. Passive warmth methods, such as simply adding layers of clothing, are particularly inadequate to meet the needs of women with cold constitutions who value appearance and those with rheumatism or arthritis who require a combination of beauty, comfort, and warmth.

[0003] Clothing insulation generally falls into two categories: active insulation and passive insulation. Active insulation refers to generating heat through the introduction of external heat-generating elements to achieve warmth. Passive insulation, on the other hand, achieves warmth by adjusting the thickness of the clothing itself and controlling the amount of still air, thus preventing heat loss from the body. Traditional insulation materials are passive, resulting in bulky, inconvenient, and unstylish designs. For people working or living in extremely low-temperature environments, passive insulation is insufficient. Therefore, developing heating elements that actively provide heat sources embedded in clothing is highly significant. Heating materials actively generate heat, resulting in even heating, rapid temperature rise, excellent warmth retention, superior comfort, and even health benefits. Textile products using heating materials maintain body temperature through active heating, reducing the number of clothing layers and achieving lightweight warmth—a future direction for winter clothing research and development. Among these, electrically heated textile products use electric heating elements to convert electrical energy into heat energy for active heating of the body.

[0004] In recent years, tourists from the south have tended to travel to northern cities in winter to experience the winter snow scenery of the north, so they especially need warm clothing. Currently, the electrothermal fabrics on the market often only have a heating function, and the heating of the fabric will make the wearer's skin dry, which will affect the skin in the long run, so it is not suitable for wearing next to the skin. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a heat-generating fabric and its preparation method. The heat-generating fabric provided by this invention has skin-moisturizing properties, is breathable and moisture-wicking, ensuring dry and comfortable wear. The fabric can generate heat, bringing warmth to cold winters. It has good heat-generating performance, can control temperature, and contains hyaluronic acid to warm the skin and protect it from moisture loss, thus possessing skin-moisturizing properties.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, embodiments of the present invention provide a heating fabric, the heating fabric comprising an outer layer, a middle layer and an inner layer, the outer layer being a waterproof and windproof layer made of a high-density woven fabric; the middle layer being an electrothermal layer containing heating materials and conductive materials; the inner layer being a skin-moisturizing layer made of a double-sided mesh textured fabric; the outer layer and the inner layer being compositely connected through the middle layer.

[0008] Furthermore, the outer high-density woven fabric has a plain or twill weave structure, and is woven from 20-70D waterproof nylon or polyester yarn, with a warp density of 380-580 ends / inch, a weft density of 380-580 ends / inch, a width of 145-155cm, and a weight of 80-180g / m². 2 .

[0009] Furthermore, one side of the double-sided mesh textured fabric has a mesh structure, and the other side has a textured structure. The mesh side is made of nylon yarn or polyester yarn with a specification of 70-150D, and the textured side is made of 30-60S acrylic / rayon yarn treated with hyaluronic acid.

[0010] The inner layer fabric has a width of 150-155cm and a weight of 120-200g / m². 2 .

[0011] Furthermore, the inner layer fabric is woven on a double-sided knitting weft knitting machine. The upper needles of the knitting machine include needles a and b, and the lower cylinder needles include needles c and d. The knitting structure of the fabric is based on 18 rows as a cycle. The yarns in the first, third, fifth, seventh, ninth, fifteenth, and seventeenth rows are float yarns on needles a and b of the upper needles, float yarns on needles c of the lower cylinder needles, and loop yarns on needles d. The yarn in the second row is loop yarns on needles a and b of the upper needles, float yarns on needles c of the lower cylinder needles, and loop yarns on needles d. The yarn in the fourth row is float yarns on needles a and b of the upper needles. The yarn for the 6th, 10th, 14th, and 18th yarns consists of the upper needle (coiled needle) with the a needle and the b needle with the floated yarn, and the lower needle (coiled needle) with the c needle forming a loop and the d needle forming a gathered loop. The yarn for the 8th, 12th, and 16th yarns consists of the upper needle (coiled needle) with the a needle and the b needle with the floated yarn, and the lower needle (coiled needle) with the c needle forming a loop and the d needle with the floated yarn. The yarn for the 11th yarn consists of the upper needle (coiled needle) with the a needle forming a loop and the b needle with the floated yarn, and the lower needle (coiled needle) with the c needle with the floated yarn and the d needle forming a loop. The yarn for the 13th yarn consists of the upper needle (coiled needle) with the a needle with the floated yarn and the b needle forming a loop, and the lower needle (coiled needle) with the c needle with the floated yarn and the d needle forming a loop.

[0012] Furthermore, the first, third, fifth, sixth, seventh, eighth, ninth, tenth, twelfth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth feed 30-60S acrylic / rayon yarn; the second, fourth, eleventh, and thirteenth feed 70-150D nylon or polyester yarn.

[0013] Furthermore, the thickness of the heating fabric is 2-4mm, the width is 145-155cm, and the weight is 210-400g / m². 2 .

[0014] Secondly, embodiments of the present invention provide a method for preparing the heat-generating fabric described in the first aspect, comprising the following steps:

[0015] (1) Preparation of outer fabric

[0016] Prepare waterproof nylon yarn or waterproof polyester yarn with a yarn specification of 20-70D, weave it into a greige fabric of the required specification, and after the greige fabric is woven, it is dyed and finished to obtain the outer high-density woven fabric.

[0017] (2) Preparation of inner double-sided mesh textured fabric

[0018] (2.1) Yarn preparation

[0019] Prepare nylon or polyester yarn with a yarn specification of 70-150D, and acrylic / rayon yarn with a specification of 30-60S. Perform hyaluronic acid finishing on the acrylic / rayon yarn: prepare a finishing solution by mixing hyaluronic acid and crosslinking agent JB-5030. The amount of hyaluronic acid added is 10-30g / L. Finish the acrylic / rayon yarn by two dips and two nips, keeping the liquid level at 75%-90%. After dips and nips, dry the yarn at a temperature of 120-170℃ for later use.

[0020] (2.2) Weaving

[0021] Double-sided mesh textured fabric greige is obtained by knitting a double-sided weft knitting machine;

[0022] (2.3) Dyeing and finishing

[0023] The woven fabric is dyed and finished. One-bath dyeing is used. After dyeing, the fabric is dehydrated, shaped and dried to obtain double-sided mesh textured fabric. The fabric width is 150-155cm and the weight is 120-200g / ㎡.

[0024] (3) Preparation of SiC conductive slurry

[0025] Grinded SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose are placed in a dispersion vessel in a certain proportion and dispersed and stirred at high speed to prepare a conductive heating paste.

[0026] (4) Composite

[0027] The prepared SiC conductive slurry is coated onto the double-sided mesh textured fabric obtained in step (2) in 2-3 layers, each layer being 0.05-0.09 mm thick. After coating, electrodes are promptly embedded for subsequent connection and power supply. Then, the outer layer of high-density woven fabric is placed on top and dried at 80-120℃ for 3-5 hours to obtain the heating fabric.

[0028] Further, by mass ratio, the ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose in the conductive heating paste described in step (3) is 1.5-3.5: 0.5-1.5: 10-20: 10-20;

[0029] The polyurethane is a polyurethane aqueous solution with a mass fraction of 50-70%, and the carboxymethyl cellulose is a carboxymethyl cellulose aqueous solution with a mass fraction of 1-3%.

[0030] Furthermore, in step (4), the electrode is made of copper foil, and a wire is connected to the outside of the electrode. Bare copper wire of 0.15-0.25mm is used as the wire.

[0031] The technical solutions of the embodiments of the present invention have the following beneficial effects:

[0032] (1) The outer layer of the heating fabric of the present invention has waterproof and windproof functions, which can adapt to the changing outdoor weather. Moreover, the waterproof performance is not achieved by adding additives, but by using waterproof raw yarn, which is durable and will not weaken due to washing or repeated wear.

[0033] (2) The heating fabric of the present invention is an electrothermal fabric with obvious heating effect, good warmth retention, and can be reused multiple times. The voltage is adjustable from 1.5 volts to 220 volts. The voltage heating material is SiC ceramic powder, which has high heating efficiency after being powered on. At 220 volts, it can reach the set temperature of 40°C in 40 seconds. The speed is fast and the heat retention effect is good. The heat retention can reach 6-8 hours, which fully meets the needs of wearing during the day.

[0034] (3) The inner layer of the heating fabric of the present invention is made of double-sided mesh textured fabric containing hyaluronic acid, which moisturizes the skin. The inner layer is directly connected to the middle heating layer, which can quickly transfer heat to the skin surface and transfer the moisture and heat of the inner layer out in time, which is warm, comfortable, breathable and dry. It can not only improve the wearing comfort of the fabric, but also reduce the discomfort caused by dry skin. At the same time, the yarn of the fabric is obtained after being treated with hyaluronic acid. The hyaluronic acid molecules have a high binding force with the yarn, which improves the durability of its performance.

[0035] (4) The middle layer of the heating fabric of the present invention is made of conductive heating paste. The SiC ceramic in the conductive heating paste has high porosity, high strength, high temperature resistance and corrosion resistance, and is used for fluid purification and filtration. The overlapping electric field generated by the ceramic heating is uniform and can quickly raise the temperature of the medium passing through its pores. The thermal efficiency is as high as 98% or more, which has unparalleled advantages and has attracted widespread attention.

[0036] (5) The heating temperature of the heating fabric of the present invention can be freely set according to the needs and can be quickly heated to the required temperature. The inner layer is a moisturizing layer containing hyaluronic acid, which has a moisturizing function. The fabric is breathable and moisture-wicking, and is dry and comfortable to wear. It brings warmth in the cold winter and can remove sweat in time during exercise, so that the skin can be effectively protected. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the heating fabric of the present invention.

[0038] Figure 2 This is a triangular schematic diagram of the weaving of the inner double-sided mesh textured fabric of the heating fabric of the present invention.

[0039] Explanation of markings in the attached diagram: A1 - outer layer, A2 - middle layer; A3 - inner layer; "∨" - knit stitch to form a circle, "∧" - purl stitch to form a circle, "—" - floating yarn; - Knead the stitches together. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] The product information for each raw material in Examples 1-3 is shown in Table 1 below:

[0042] Table 1. Commodity information for each raw material in Examples 1-3

[0043] Raw material name factory Waterproof nylon yarn Yiwu Huading Co., Ltd. Waterproof polyester yarn Jiangsu Shenghong Chemical Fiber Co., Ltd. Acrylic / Rayon Yarn Nantong Shuanghong Textile Co., Ltd. Hyaluronic acid Zibo Dayanfang Silk Group Co., Ltd. Crosslinking agent JB-5030 Suzhou Jiubang Chemical Co., Ltd. SiC ceramic powder Hangzhou Jikang New Materials Co., Ltd. Graphite powder Shenzhen BTR New Energy Materials Co., Ltd. polyurethane Shenzhen Yoshida Chemical Co., Ltd. Carboxymethyl cellulose Shanghai Dongfu Chemical Technology Co., Ltd. dye Huntsman

[0044] Example 1

[0045] like Figure 1 As shown, a heating fabric includes an outer layer, a middle layer, and an inner layer. The outer layer is a waterproof and windproof layer made of high-density woven fabric. The middle layer is an electrothermal layer containing heating and conductive materials. The inner layer is a skin-moisturizing layer made of double-sided mesh textured fabric. The outer and inner layers are connected by the middle layer.

[0046] The outer high-density woven fabric has a plain weave structure, using 20D waterproof nylon yarn, with a warp density of 580 ends / inch and a weft density of 580 ends / inch, a width of 145cm, and a weight of 80g / m². 2 .

[0047] The heating materials include SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose, with a mass ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose = 1.5:0.5:10:10.

[0048] The double-sided mesh textured fabric has a mesh structure on the upper surface and a textured structure on the lower surface. The mesh side is made of 70D nylon yarn, while the textured side is made of 60S acrylic / rayon yarn treated with hyaluronic acid. The textured side is located on the side closest to the wearer's skin.

[0049] The inner fabric has a width of 150cm and a weight of 120g / m². 2 .

[0050] The inner fabric is made of double-sided knitted weft knitting, such as... Figure 2 As shown, the upper needles of the loom include needles a and b, and the lower needles include needles c and d. The knitting structure of the fabric is a cycle of 18 rows. The first, third, fifth, seventh, ninth, fifteenth, and seventeenth rows consist of upper needles (needles a and b) as floats, and lower needles (needles c and d) as floats, with the yarn forming loops. The second row consists of upper needles (needles a) forming loops, needles b as floats, and lower needles (needles c) forming loops, with needles d forming loops. The fourth row consists of upper needles (needles a) as floats, needles b as loops, and lower needles (needles c) forming loops. The yarn for the sixth, tenth, fourteenth, and eighteenth lines consists of upper needles (coiled needles, a and b needles, with floating yarn) and lower needles (cylinder needles, c needles, and d needles, forming loops). The yarn for the eighth, twelfth, and sixteenth lines consists of upper needles (coiled needles, a and b needles, with floating yarn) and lower needles (cylinder needles, c needles, and d needles, forming loops). The yarn for the eleventh line consists of upper needles (coiled needles, a needle, b needles, c needles, and d needles, forming loops). The yarn for the thirteenth line consists of upper needles (coiled needles, a needle, b needles, c needles, and d needles, forming loops).

[0051] The first, third, fifth, sixth, seventh, eighth, ninth, tenth, twelfth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth feed 60S acrylic / rayon yarn; the second, fourth, eleventh, and thirteenth feed 70D nylon yarn.

[0052] The heating fabric is 2mm thick, 145cm wide, and weighs 210g / m². 2 .

[0053] The preparation method of the above-mentioned heat-generating fabric includes the following steps:

[0054] (1) Preparation of outer fabric

[0055] Prepare 20D waterproof nylon yarn to weave a plain weave fabric with a warp density of 580 ends / inch and a weft density of 580 ends / inch. After weaving, the fabric is dyed and finished to obtain a high-density woven outer fabric. The width of the outer fabric is 145cm and the weight is 80g / m². 2 ;

[0056] (2) Preparation of inner double-sided mesh textured fabric (2.1) Yarn preparation

[0057] Prepare 70D nylon yarn and 60S acrylic / rayon yarn. Perform hyaluronic acid finishing on the 60S acrylic / rayon yarn: prepare a finishing solution with hyaluronic acid and crosslinking agent JB-5030, with an addition amount of 10g / L of hyaluronic acid. Use a two-dip and two-paste method to finish the acrylic / rayon yarn, keeping the liquid level at 75%. After dipping and padding, dry the yarn at 120℃ for later use.

[0058] (2.2) Weaving

[0059] The greige fabric of double-sided mesh textured fabric is obtained by knitting a double-sided weft knitting machine;

[0060] (2.3) Dyeing and finishing

[0061] The woven fabric is dyed and finished. One-bath dyeing is used for dyeing, and high-fastness imported dyes are used. After dyeing, the fabric is dehydrated, shaped and dried to obtain the inner layer double-sided mesh textured fabric. The width of the inner layer fabric is 150cm and the weight is 120g / ㎡.

[0062] (3) Preparation of SiC conductive slurry

[0063] Grinded SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose are placed in a dispersion vessel in a certain proportion and dispersed and stirred at high speed to prepare a conductive heating paste. The mass ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose is 1.5:0.5:10:10. Among them, the polyurethane is a 50% polyurethane aqueous solution and the carboxymethyl cellulose is a 1% carboxymethyl cellulose aqueous solution.

[0064] (4) Composite

[0065] The prepared SiC conductive paste is coated onto the double-sided mesh textured fabric in two layers, each layer being 0.09 mm thick. After coating, electrodes are immediately embedded to facilitate subsequent connection and power supply. Copper foil is used as the electrode, and a wire is connected to the outside of the electrode. 0.15 mm bare copper wire is used as the wire. Then, the outer layer of high-density woven fabric is placed on top and dried at 120°C for 3 hours.

[0066] Example 2

[0067] like Figure 1 As shown, a heating fabric includes an outer layer, a middle layer, and an inner layer. The outer layer is a waterproof and windproof layer made of high-density woven fabric. The middle layer is an electrothermal layer containing heating and conductive materials. The inner layer is a skin-moisturizing layer made of double-sided mesh textured fabric. The outer and inner layers are connected by the middle layer.

[0068] The heating materials include SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose, with a mass ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose of 2:1:15:15.

[0069] The outer high-density woven fabric has a twill weave and is made of 40D waterproof nylon yarn. The warp density is 450 ends / inch, the weft density is 400 ends / inch, the width is 150cm, and the weight is 130g / m². 2 .

[0070] The fabric with a double-sided mesh textured structure has a mesh structure on the upper surface and a textured structure on the lower surface. The mesh side is made of 100D nylon yarn, while the textured side is made of 50S acrylic / rayon yarn treated with hyaluronic acid. The textured side is located on the side closest to the wearer's skin.

[0071] The inner fabric has a width of 152cm and a weight of 160g / m². 2 .

[0072] The inner fabric is made of double-sided knitted weft knitting, such as... Figure 2 As shown, the upper needles of the loom include needles a and b, and the lower needles include needles c and d. The knitting structure of the fabric is a cycle of 18 rows. The first, third, fifth, seventh, ninth, fifteenth, and seventeenth rows consist of upper needles (needles a and b) as floats, and lower needles (needles c and d) as floats, with the yarn forming loops. The second row consists of upper needles (needles a) forming loops, needles b as floats, and lower needles (needles c) forming loops, with needles d forming loops. The fourth row consists of upper needles (needles a) as floats, needles b as loops, and lower needles (needles c) forming loops. The yarn for the sixth, tenth, fourteenth, and eighteenth lines consists of upper needles (coiled needles, a and b needles, with floating yarn) and lower needles (cylinder needles, c needles, and d needles, forming loops). The yarn for the eighth, twelfth, and sixteenth lines consists of upper needles (coiled needles, a and b needles, with floating yarn) and lower needles (cylinder needles, c needles, and d needles, forming loops). The yarn for the eleventh line consists of upper needles (coiled needles, a needle, b needles, c needles, and d needles, forming loops). The yarn for the thirteenth line consists of upper needles (coiled needles, a needle, b needles, c needles, and d needles, forming loops).

[0073] 50S acrylic / rayon yarn is fed into the first, third, fifth, sixth, seventh, eighth, ninth, tenth, twelfth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth feeders; 100D nylon yarn is fed into the second, fourth, eleventh, and thirteenth feeders.

[0074] The heating fabric is 3mm thick, 150cm wide, and weighs 300g / m². 2 .

[0075] The preparation method of the above-mentioned heat-generating fabric includes the following steps:

[0076] (1) Preparation of outer fabric

[0077] Prepare waterproof nylon yarn with a yarn specification of 40D, and weave it into a twill fabric with a warp density of 450 threads / inch and a weft density of 400 threads / inch. After the greige fabric is woven, it is dyed and finished to obtain the outer high-density woven fabric. The width of the outer fabric is 150cm and the weight is 130g / ㎡.

[0078] (2) Preparation of inner double-sided mesh textured fabric (2.1) Yarn preparation

[0079] Prepare 100D nylon yarn and 50S acrylic / rayon yarn. Perform hyaluronic acid finishing on the 50S acrylic / rayon yarn: prepare a finishing solution with hyaluronic acid and crosslinking agent JB-5030, with an addition amount of 20g / L of hyaluronic acid. Use a two-dip and two-paste method to finish the acrylic / rayon yarn, keeping the liquid level at 80%. After padding, dry the yarn at 150℃ for later use.

[0080] (2.2) Weaving

[0081] like Figure 2 As shown, a double-sided mesh textured fabric is obtained by knitting a double-sided weft knitting machine.

[0082] (2.3) Dyeing and finishing

[0083] The woven fabric is dyed and finished. One-bath dyeing is used for dyeing, and high-fastness dye is used. After dyeing, the fabric is dehydrated, shaped and dried to obtain the inner layer double-sided mesh textured fabric. The width of the inner layer fabric is 152cm and the weight is 160g / ㎡.

[0084] (3) Preparation of SiC conductive slurry

[0085] Grinded SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose are placed in a dispersion vessel in a certain proportion and dispersed and stirred at high speed to prepare a conductive heating paste. The mass ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose is 2:1:15:15. Among them, the polyurethane is a 60% polyurethane aqueous solution and the carboxymethyl cellulose is a 2% carboxymethyl cellulose aqueous solution.

[0086] (4) Composite

[0087] The prepared SiC conductive paste was coated onto a double-sided mesh textured fabric in two layers, each 0.07 mm thick. Electrodes were then embedded immediately after coating to facilitate subsequent connection and power supply. Copper foil was used as the electrode, and a 0.2 mm bare copper wire was used as the conductor to connect the electrode. The outer layer of high-density woven fabric was then placed on top and dried at 100°C for 4 hours.

[0088] Example 3

[0089] like Figure 1 As shown, a heating fabric includes an outer layer, a middle layer, and an inner layer. The outer layer is a waterproof and windproof layer made of high-density woven fabric. The middle layer is an electrothermal layer containing heating and conductive materials. The inner layer is a skin-moisturizing layer made of double-sided mesh textured fabric. The outer and inner layers are connected by the middle layer.

[0090] The heating materials include SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose, with a mass ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose of 3.5:1.5:20:20.

[0091] The outer high-density woven fabric has a plain weave structure and is made of 70D waterproof polyester yarn. The warp density is 380 ends / inch, the weft density is 380 ends / inch, the width is 155cm, and the weight is 180g / m². 2 .

[0092] The fabric features a double-sided mesh textured structure. The upper surface is mesh, while the lower surface is textured. The textured structure conforms to the skin. The mesh side is made of 150D polyester yarn, while the textured side is made of 30S acrylic / rayon yarn treated with hyaluronic acid. The textured side is located closer to the wearer's skin.

[0093] The inner fabric has a width of 155cm and a weight of 200g / m². 2 .

[0094] The inner fabric is made of double-sided knitted weft knitting, such as... Figure 2As shown, the upper needles of the loom include needles a and b, and the lower needles include needles c and d. The knitting structure of the fabric is a cycle of 18 rows. The first, third, fifth, seventh, ninth, fifteenth, and seventeenth rows consist of upper needles (needles a and b) as floats, and lower needles (needles c and d) as floats, with the yarn forming loops. The second row consists of upper needles (needles a) forming loops, needles b as floats, and lower needles (needles c) forming loops, with needles d forming loops. The fourth row consists of upper needles (needles a) as floats, needles b as loops, and lower needles (needles c) forming loops. The yarn for the sixth, tenth, fourteenth, and eighteenth lines consists of upper needles (coiled needles, a and b needles, with floating yarn) and lower needles (cylinder needles, c needles, and d needles, forming loops). The yarn for the eighth, twelfth, and sixteenth lines consists of upper needles (coiled needles, a and b needles, with floating yarn) and lower needles (cylinder needles, c needles, and d needles, forming loops). The yarn for the eleventh line consists of upper needles (coiled needles, a needle, b needles, c needles, and d needles, forming loops). The yarn for the thirteenth line consists of upper needles (coiled needles, a needle, b needles, c needles, and d needles, forming loops).

[0095] The first, third, fifth, sixth, seventh, eighth, ninth, tenth, twelfth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth feed 30S acrylic / rayon yarn; the second, fourth, eleventh, and thirteenth feed 150D nylon yarn.

[0096] The heating fabric is 4mm thick, 155cm wide, and weighs 400g / m². 2 .

[0097] The preparation method of the above-mentioned heat-generating fabric includes the following steps:

[0098] (1) Preparation of outer fabric

[0099] Prepare waterproof polyester yarn with a yarn specification of 70D, and weave it into a plain weave fabric with a warp density of 380 threads / inch and a weft density of 380 threads / inch. After the fabric is woven, it is dyed and finished to obtain an outer high-density woven fabric. The width of the outer fabric is 155cm and the weight is 180g / ㎡.

[0100] (2) Preparation of inner double-sided mesh textured fabric (2.1) Yarn preparation

[0101] Prepare 150D polyester yarn and 30S acrylic / rayon yarn. Perform hyaluronic acid finishing on the 30S acrylic / rayon yarn: prepare a finishing solution with hyaluronic acid and crosslinking agent JB-5030, with an addition amount of 30g / L of hyaluronic acid. Use a two-dip and two-paste method to finish the acrylic / rayon yarn, keeping the liquid level at 90%. After padding, dry the yarn at 170℃ for later use.

[0102] (2.2) Weaving

[0103] Double-sided mesh textured fabric greige is obtained by knitting a double-sided weft knitting machine;

[0104] (2.3) Dyeing and finishing

[0105] The woven fabric is dyed and finished. One-bath dyeing is used for dyeing, and high-fastness imported dyes are used. After dyeing, the fabric is dehydrated, shaped and dried to obtain the inner layer double-sided mesh textured fabric. The width of the inner layer fabric is 155cm and the weight is 200g / ㎡.

[0106] (3) Preparation of SiC conductive slurry

[0107] Grinded SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose were placed in a dispersion vessel in a certain proportion and dispersed and stirred at high speed to prepare a conductive heating paste. The mass ratio of SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose was 3.5:1.5:20:20. The polyurethane was a 70% polyurethane aqueous solution and the carboxymethyl cellulose was a 3% carboxymethyl cellulose aqueous solution.

[0108] (4) Composite

[0109] The prepared SiC conductive paste is coated onto a double-sided mesh textured fabric in three layers, each 0.05 mm thick. Electrodes are then embedded immediately after coating to facilitate subsequent connection and power supply. Copper foil is used as the electrode, and a 0.25 mm bare copper wire is used as the conductor to connect the electrode. The outer layer of high-density woven fabric is then placed on top and dried at 120°C for 5 hours.

[0110] Comparative Example 1

[0111] The electric heating thermal underwear purchased on the market, brand: Shengtianhong, fabric structure: three-layer structure, carbon fiber heating, adjustable temperature 45-55℃.

[0112] The heating fabrics prepared in Examples 1-3 and the fabric provided in Comparative Example 1 were subjected to relevant performance tests. Electrothermal performance was tested under constant temperature and humidity conditions at a voltage of 2.5V. Five tests were conducted on different parts, and the average value was taken. A thermal imager (TC01A Fluke Electronic Instruments Co., Ltd.) was used to measure the heating temperature, and a DC regulated power supply (QJ6003S, Langpu Electronic Technology Co., Ltd.) was used to provide the voltage. Moisture retention performance was tested according to T / CTES1035—2021 "Test and Evaluation of Moisture Retention Performance of Sodium Hyaluronate Textiles". Moisture permeability was tested according to GB / T 12704.2-2009 Method B, condition a (inverted cup method, test chamber temperature: 38℃, humidity: 50%, wind speed: 0.3-0.5m / s, reverse side facing water). The test results are shown in Table 2.

[0113] Table 2 Comparison of relevant performance in Examples 1-3 and Comparative Example 1

[0114]

[0115] As shown in the table above, compared with the fabric of the comparative example, the heating fabrics provided in Examples 1-3 of this invention have excellent electrothermal performance. Compared with Comparative Example 1, they heat up faster and retain heat for a longer time. Under the same voltage and time, the temperature reached is much higher than that of Comparative Example 1. Furthermore, the heating fabric prepared by this invention contains hyaluronic acid, which gives the fabric excellent moisturizing properties and good performance retention after 10 washes. At the same time, the fabric has good moisture permeability, is breathable and dry, and improves the wearing comfort of the fabric.

[0116] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A heat-generating fabric, characterized in that, The heating fabric includes an outer layer, a middle layer, and an inner layer. The outer layer is a waterproof and windproof layer made of high-density woven fabric. The middle layer is an electrothermal layer. The inner layer is a skin-moisturizing layer made of double-sided mesh textured fabric. The electrothermal layer includes a SiC conductive slurry coated on the double-sided mesh textured fabric and embedded electrodes. The outer layer and the inner layer are connected by the middle layer. The double-sided mesh textured fabric has a mesh structure on one side and a textured structure on the other side. The mesh side is woven with nylon or polyester yarn with a specification of 70-150D, and the textured side is woven with 30-60S acrylic / rayon yarn treated with hyaluronic acid. The inner layer fabric has a width of 150-155cm and a weight of 120-200g / m². 2 The inner layer fabric is woven on a double-sided knitting weft knitting machine. The upper needles of the knitting machine include needles a and b, and the lower cylinder needles include needles c and d. The knitting structure of the fabric is 18 rows per cycle. The first, third, fifth, seventh, ninth, fifteenth, and seventeenth cycles consist of float yarn on needles a and b on the upper needles, float yarn on needle c on the lower cylinder needles, and loop yarn on needle d. The second cycle consists of loop yarn on needles a and b on the upper needles, loop yarn on needle c on the lower cylinder needles, and loop yarn on needle d. The fourth cycle consists of float yarn on needles a and b on the upper needles. The yarn for the sixth, tenth, fourteenth, and eighteenth yarns consists of upper needles (coiled needles, needles a and b) with floating yarn, and lower needles (coiled needles, needles c) with loops and needles d with gathered loops. The yarn for the eighth, twelfth, and sixteenth yarns consists of upper needles (coiled needles, needles a and b) with floating yarn, and lower needles (coiled needles, needles c) with loops and needles d with floating yarn. The yarn for the eleventh yarn consists of upper needles (coiled needles, needles a and b) with loops, and lower needles (coiled needles, needles c) with floating yarn and needles d with loops. The yarn for the thirteenth yarn consists of upper needles (coiled needles, needles a and b) with floating yarn, and lower needles (coiled needles, needles c) with floating yarn and needles d with loops.

2. The heating fabric according to claim 1, characterized in that, The outer high-density woven fabric has a plain or twill weave structure, made of 20-70D waterproof nylon or polyester yarn, with a warp density of 380-580 ends / inch and a weft density of 380-580 ends / inch, a width of 145-155cm, and a weight of 80-180g / m². 2 .

3. The heating fabric according to claim 1, characterized in that, The first, third, fifth, sixth, seventh, eighth, ninth, tenth, twelfth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth feeders are 30-60S acrylic / rayon yarn. The second, fourth, eleventh, and thirteenth feeders are 70-150D nylon or polyester yarn.

4. The heating fabric according to claim 1, characterized in that, The heating fabric has a thickness of 2-4mm, a width of 145-155cm, and a weight of 210-400g / m². 2 .

5. A method for preparing the heating fabric according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Preparation of outer fabric Prepare waterproof nylon yarn or waterproof polyester yarn with a yarn specification of 20-70D, weave it into a greige fabric of the required specification, and after the greige fabric is woven, it is dyed and finished to obtain the outer high-density woven fabric. (2) Preparation of inner double-sided mesh textured fabric (2.1) Yarn preparation Prepare nylon or polyester yarn with a yarn specification of 70-150D, and acrylic / rayon yarn with a specification of 30-60S. Perform hyaluronic acid finishing on the acrylic / rayon yarn: prepare a finishing solution by mixing hyaluronic acid and crosslinking agent JB-5030. The amount of hyaluronic acid added is 10-30g / L. Finish the acrylic / rayon yarn by two dips and two nips, keeping the nips residue at 75%-90%. After dips and nips, dry the yarn at a temperature of 120-170℃ for later use. (2.2) Weaving Double-sided mesh textured fabric greige is obtained by knitting a double-sided weft knitting machine; (2.3) Dyeing and finishing The woven fabric is dyed and finished. One-bath dyeing is used. After dyeing, the fabric is dehydrated, shaped and dried to obtain double-sided mesh textured fabric. The fabric width is 150-155cm and the weight is 120-200g / ㎡. (3) Preparation of SiC conductive slurry Grinded SiC ceramic powder, graphite powder, polyurethane, and carboxymethyl cellulose are placed in a dispersion vessel in a certain proportion and dispersed and stirred at high speed to prepare SiC conductive slurry. By mass ratio, the SiC conductive slurry in step (3) contains SiC ceramic powder: graphite powder: polyurethane: carboxymethyl cellulose in the ratio of 1.5-3.5: 0.5-1.5: 10-20: 10-20. The polyurethane is a polyurethane aqueous solution with a mass fraction of 50-70%, and the carboxymethyl cellulose is a carboxymethyl cellulose aqueous solution with a mass fraction of 1-3%. (4) Composite The SiC conductive slurry prepared in step (3) is coated onto the double-sided mesh textured fabric prepared in step (2) in 2-3 layers, each layer being 0.05-0.09 mm thick. After coating, electrodes are promptly embedded to facilitate subsequent connection and power supply. Then, the outer high-density woven fabric is placed on top and dried at 80-120℃ for 3-5 hours to obtain the heating fabric.

6. The method for preparing the heating fabric according to claim 5, characterized in that, In step (4), the electrode is made of copper foil and is connected to a wire. Bare copper wire of 0.15-0.25mm is used as the wire.

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