Printing heating fabric preparation process and product

Abstract

The invention relates to the technical field of fabric processing, in particular to a printed heating fabric preparation process and a product, and the printed heating fabric preparation process comprises the following preparation steps: S1, grinding graphene and a spinning solution together, adding mineral powder, mixing to obtain a mixture, spinning by adopting a wet spinning process to prepare filaments, and drying the filaments to obtain the printed heating fabric; the filaments are subjected to drafting, oiling, drying and heat setting procedures, and the viscose fibers are obtained; s2, grinding graphene and the slices together, then adding mineral powder for mixing, and then performing heating melting, extrusion and spinning forming to obtain polymer fibers; s3, spinning viscose fibers and polymer fibers into composite yarns, and then spinning the composite yarns into a fabric; s4, temperature change ink is printed on the surface of the fabric, and the printed heating fabric is obtained.The printed heating fabric prepared through the technology has good air and moisture permeability, heat retention property, strength and durability and can be used for a long time.

Description

Technical Field

[0001] The present application relates to the technical field of fabric processing, and more specifically, to a preparation process and product of a printed heating fabric. Background Art

[0002] Graphene heating fabric is a new type of fabric that uses the excellent thermal conductivity of graphene materials to achieve fast and uniform heating. It is widely used in clothing, especially in the field of thermal underwear. Traditionally, most graphene heating fabrics are prepared by coating with graphene coating, that is, the prepared graphene coating is applied to the surface of the fabric by spraying, dipping or other efficient coating methods to form a uniformly dispersed graphene film layer, which can greatly improve the thermal insulation performance of the fabric and reduce heat loss. However, this method will greatly reduce the air permeability and moisture permeability of the fabric, reduce the wearing comfort, and at the same time, the graphene layer falls off after multiple washings, and the warmth retention of the fabric is greatly reduced, thereby limiting the long-term stability and durability of the graphene heating fabric in practical applications.

[0003] In order to further improve the breathability of graphene fabrics and prevent graphene from falling off the fabrics, people began to add graphene to fibers to prepare graphene-containing fibers, and then prepare them into fabrics, which can effectively preserve graphene and extend the warmth retention time of the fabrics. However, the binding force between graphene molecules and polymers is weak, and stratification is prone to occur, which affects the strength and durability of the fabrics. Summary of the invention

[0004] In order to simultaneously improve the warmth retention, strength and durability of fabrics, the present application provides a printed heat-generating fabric preparation process and product.

[0005] In the first aspect, the present application provides a process for preparing a printed heating fabric, which adopts the following technical solution: A process for preparing a printed heat-generating fabric comprises the following steps: S1, grinding graphene and spinning solution together, adding mineral powder to mix, obtaining a mixture, spinning into filaments by wet spinning process, and then drawing, oiling, drying and heat setting the filaments to obtain viscose fibers; S2, grinding the graphene and the slice together, adding mineral powder to mix, heating and melting, extruding, and spinning to obtain polymer fibers; S3, spinning the viscose fiber and the polymer fiber into composite yarn, and then spinning the composite yarn into fabric; S4, printing temperature-changing ink on the surface of the fabric to obtain a printed heating fabric.

[0006] By adopting the above technical solution, the prepared printed heating fabric has good air permeability and moisture permeability, warmth retention, strength and durability, and can be used for a long time.

[0007] In step S1 and step S2, graphene is ground together with spinning solution and slices, and mineral powder is added for mixing. The mineral powder acts as a reinforcing agent to increase the friction and bonding force inside the fiber, making the graphene more stable in the fiber. Subsequently, through wet spinning or melt spinning process, the graphene is evenly dispersed inside the fiber to form a stable graphene fiber.

[0008] In step S3, the viscose fiber and polymer fiber containing graphene are spun into composite yarn. The two fibers are intertwined and entangled with each other during the spinning process to form a tight structure. This structure not only combines the advantages of the two fibers, but also enhances the strength and durability of the fabric through the interweaving of the fibers, and also makes the distribution of graphene in the fabric more uniform, further enhancing the warmth retention and air permeability of the fabric.

[0009] In step S4, temperature-variable ink is printed on the surface of the fabric. This ink can change color or pattern in response to changes in ambient temperature, providing users with intuitive temperature perception, while not affecting the warmth and breathability of the fabric, and increasing the aesthetics of the product. At the same time, graphene and mineral powder are added to the copper drum in this application to improve the adhesion stability of the temperature-variable ink on the fabric.

[0010] Preferably, the slice is one of nylon slice, PBT polyester slice, PPE polyester slice or polyphenylene ether ester slice. Preferably, the spinning solution is prepared by the following method: (1) adding pulp to a NaOH solution for alkalization, adding γ-mercaptopropyltriethoxysilane during immersion, the amount of which is 0.1-0.3% of the weight of the pulp, the bath ratio of pulp mass (g) to the total volume of the NaOH solution (mL) is 1:8-10, the immersion time is 2-4 hours, and alkali cellulose is obtained after immersion and pressing; (2) subjecting the alkali cellulose to an aging treatment at a temperature of 15-20° C. for 3-4 hours to obtain aged alkali cellulose; (3) subjecting the aged alkali cellulose to a yellowing treatment at a temperature of 25-30° C. for a yellowing time of 40-50 min to obtain yellowed alkali cellulose; (4) adding alkali to dissolve, degassing, filtering and ripening to obtain a spinning solution with a methyl cellulose content of 7-9wt%, an alkali content of 5-6%, a ripening degree of 10-12ml, an esterification degree of 47-49 and a viscosity of 60-62s.

[0011] Preferably, the pulp includes at least one of cotton pulp, wood pulp and bamboo pulp.

[0012] By adopting the above technical scheme, the prepared spinning solution has suitable viscosity, alkali content and maturity, which is beneficial to the stability of the spinning process and the uniformity of fiber quality, and is beneficial to the good softness, strength, air permeability and warmth retention of the spun yarn.

[0013] By adding γ-mercaptopropyltriethoxysilane, the flexibility, aging resistance and adhesion to graphene of the fiber can be effectively improved, thereby improving the overall performance of the fiber. The aging process allows the alkali cellulose to react with oxygen in the air, the degree of polymerization of cellulose is reduced, and the viscosity drops to the process requirements, which is beneficial to the subsequent yellowing and dissolution process. Yellowing improves the hydrophilicity and wettability of the fiber, which is beneficial to the dispersion and dissolution of the fiber during the spinning process. The degassing process can remove the bubbles generated during the dissolution process to ensure the uniformity of the spinning solution. The filtration process can remove impurities and particles that are not completely dissolved and improve the purity of the spinning solution. The aging process can make the parameters such as viscosity, alkali content and degree of esterification of the spinning solution reach a stable state, which is beneficial to the subsequent spinning process.

[0014] Preferably, in step S1, the amount of graphene used is 5-15% of the weight of the cotton pulp, and the amount of mineral powder used is 5-10% of the weight of the cotton pulp.

[0015] By adopting the above technical solutions, the dosage of graphene, spinning solution and mineral powder is optimized, so that the fabric has excellent warmth retention, breathability and durability.

[0016] The content of graphene is controlled within the range of 5-15%, which can ensure the uniform distribution of graphene in the spinning solution, avoiding the problems of increased difficulty in preparation and reduced flexibility caused by excessive graphene content. The addition of mineral powder can enhance the bonding force between graphene and the spinning solution, and improve the strength and durability of the fiber.

[0017] Preferably, in step S1, the amount of graphene used is 5-15% of the weight of the slices, and the amount of mineral powder used is 10-15% of the weight of the slices.

[0018] By adopting the above technical solution and optimizing the amount of graphene, slices and mineral powder, the fabric has excellent warmth retention, breathability and durability. At the same time, due to the uniform dispersion of graphene and mineral powder, the feel and comfort of the fabric are further improved.

[0019] Adding 5-15% of graphene to the slices can ensure the uniform dispersion of graphene in the polymer and avoid agglomeration, thereby giving full play to the excellent thermal conductivity of graphene. Adding mineral powder in an amount of 10-15% of the slice weight can significantly enhance the bonding force between graphene and the polymer, and improve the strength and durability of the fiber.

[0020] Preferably, in step S3, the surface of the fabric is subjected to a sanding treatment, the sanding speed is 800-1000 r / min, the sanding tension is 30-40 kg, and the running speed of the grey fabric is 6-10 m / min.

[0021] By adopting the above technical solution, the fluffy feeling on the surface of the fabric is increased, and the softness, comfort and warmth retention of the fabric are increased.

[0022] After the sanding treatment, a layer of fluff is formed on the surface of the fabric, which can lock more air and thus improve the warmth retention of the fabric. In cold environments, sanded fabrics can better maintain body temperature and reduce heat loss. Optimizing the sanding speed, tension and running speed of the grey fabric can ensure that the fluff layer is not too tight, thereby maintaining good air permeability of the fabric, better regulating body temperature and humidity, and improving wearing comfort.

[0023] Preferably, the graphene is pretreated by the following method: Graphene, propylene glycol triglycidyl ether, tetrabutylammonium bromide, silane coupling agent and N, N-dimethylformamide are uniformly mixed in a mass ratio of 5:2:1:0.5:10-15, heated to 70-80°C in a nitrogen atmosphere, stirred for reaction for 2-3 hours, centrifuged and washed with pure water and anhydrous ethanol, and allowed to stand at 40-50°C for 2-3 hours to obtain pretreated graphene.

[0024] By adopting the above technical solution, the dispersion of graphene in viscose fibers and polymer fibers can be further improved, which helps to improve the uniformity of the warmth retention of the fabric while also improving the strength and durability of the fabric.

[0025] Among them, the epoxy group in propylene glycol triglycidyl ether can react with the functional groups such as hydroxyl and carboxyl on the surface of graphene to form chemical bonding, thereby improving the dispersibility of graphene and its compatibility with cotton pulp and slices. One end of the silane coupling agent can react with the functional groups on the surface of graphene, and the other end can chemically bond with the matrix materials such as polymers, playing a bridging role, enhancing the interfacial bonding force between graphene and cotton pulp and slices, and enhancing the strength and durability of the fabric. Surfactants such as tetrabutylammonium bromide can reduce the surface tension of graphene, making it easier to disperse evenly in the solvent. N, N-dimethylformamide can be used as a solvent to bind propylene glycol triglycidyl ether, tetrabutylammonium bromide, silane coupling agent and graphene, which is conducive to the full contact and reaction of the modifier with graphene.

[0026] Preferably, the mineral powder includes at least one of expanded pearlite powder, diatomaceous earth powder, dolomite powder, talc powder and mica powder.

[0027] By adopting the above technical solution, the type of mineral powder is optimized, the strength of the fabric is enhanced, the fabric is avoided to be too hard, the comfort of the fabric is improved, and the warmth retention of the fabric is improved, the fabric is further kept dry, the accumulation of sweat is reduced, and the wearing comfort is improved.

[0028] Preferably, in step S1, the spinning is ejected through a spinneret, the diameter of the spinneret is 0.05 mm-0.1 mm, and the ejection speed of the spinneret is 50-60 m / min.

[0029] By adopting the above technical solution and optimizing the spinning parameters, it is helpful to evenly distribute the fibers during the spinning process, reduce the uneven thickness of the viscose fibers, improve the uniformity and consistency of the viscose fibers, and make the fabric softer, more breathable and warmer.

[0030] Preferably, the coagulation bath used in the spinning process in step S1 includes 80-110 g / L sulfuric acid, 200-230 g / L sodium sulfate and 50-70 g / L zinc sulfate, and the temperature is 50-60°C.

[0031] By adopting the above technical solution, the parameters and temperature of the coagulation bath are optimized, and the strength and flexibility of the viscose fiber are further improved.

[0032] In the second aspect, the present application provides a product of a printed heating fabric preparation process, which adopts the following technical scheme: a product of a printed heating fabric preparation process, comprising a fabric layer and a temperature-sensitive ink layer coated on the surface of the fabric layer, which is prepared by the printed heating fabric preparation process described in the first aspect.

[0033] By adopting the above technical solution, the printed heating fabric prepared has good warmth retention, breathability and moisture permeability, and also has good strength, softness and durability, and has a rich and beautiful appearance.

[0034] In summary, this application has the following beneficial effects: 1. Improve breathability and warmth retention: By adding graphene to viscose fibers and polymer fibers in different ways, and then spinning them into composite yarns and making them into fabrics, the excellent thermal conductivity of graphene is retained, and the breathability of the fabric is improved through the interwoven structure of the fibers, so that heat can be effectively circulated inside the fabric, while the external air can also circulate moderately, thereby improving the comfort of wearing.

[0035] 2. Enhance the stability of graphene: Through specific grinding, mixing and spinning processes, graphene molecules are evenly and firmly embedded in the fiber, avoiding the problem of easy shedding of graphene in traditional coating methods, thereby extending the warmth retention time of the fabric and improving durability.

[0036] 3. Improve fabric strength and durability: Adding mineral powder during the process of combining graphene and fiber not only enhances the interaction between graphene and polymer, reduces stratification, but also improves the strength and toughness of the fiber itself, making the fabric more durable as a whole. DETAILED DESCRIPTION Example

[0037] The graphene was purchased from Changzhou Yaobang Friction Material Factory and was of high quality.

[0038] PBT polyester chips were purchased from Shanghai Xiaohong Industrial Co., Ltd. with the brand number B4520.

[0039] The temperature-changing ink was purchased from Shenzhen Xingsheng Pearlescent Chemical Pigment Co., Ltd. The color is sky blue and the tinting strength is 100.

[0040] Commercially available spinning solution is prepared by the following method: Impregnation: 200 g of cotton pulp raw material is immersed in a sodium hydroxide solution with a temperature of 45°C and a mass fraction of 12% for 50 minutes to obtain alkali cellulose; Aging: The alkali cellulose is squeezed, crushed and then aged at a temperature of 20°C for 2 hours; Xanthation: add CS2 (25% by mass of alkali cellulose) to mix and carry out xanthation reaction at a temperature of 15°C for 30 minutes to generate cellulose xanthate; dissolve the cellulose xanthate in a 4% sodium hydroxide solution, and carry out dissolution, filtration, degassing and aging in sequence to obtain a spinning solution.

[0041] Example 1 A printed heat-generating fabric is prepared by the following method: S1, 10g of graphene and 200g of commercially available spinning solution were ground together, and then 10g of mineral powder (expanded perlite powder) was added to mix to obtain a mixture, and then the mixture was spun into filaments by a wet spinning process, and then the filaments were drafted, oiled, dried, and heat-set to obtain viscose fibers, and the fineness of the viscose fibers was 14dtex; In step S1, the spinning is ejected through the spinneret, the diameter of the spinneret is 0.05 mm, and the ejection speed of the spinneret is 50 m / min; in step S1, the coagulation bath used in the spinning process includes 80 g / L sulfuric acid, 200 g / L sodium sulfate and 50 g / L zinc sulfate, and the temperature is 50°C; S2, grinding 10 g of graphene and 200 g of polyester chips (PBT polyester chips) together, adding 20 g of mineral powder (expanded perlite powder) to mix, heating and melting, extruding, and spin-forming to obtain polymer fibers, the fineness of the polymer fibers is 14 dtex; S3, spinning the viscose fiber and the polymer fiber into composite yarn, and then spinning the composite yarn into fabric; S4, printing temperature-changing ink on the surface of the fabric to obtain a printed heating fabric.

[0042] The difference between Example 2-3 and Example 1 is that the types of raw materials, amounts and experimental parameters for preparing the printed heating fabric are different. The specific differences are shown in Table 1: Table 1 Types, amounts and experimental parameters of raw materials used in preparing printed heating fabrics in Examples 1-3 Example 4 A printed heating fabric, the difference between this embodiment and embodiment 1 is that the spinning solution is prepared by the following method: (1) 200 g of pulp (cotton pulp) was added to 1600 ml of NaOH solution (mass fraction 10%) for alkalization by impregnation. During the impregnation, 2 g of γ-mercaptopropyltriethoxysilane was added in an amount of 1% of the weight of the pulp. The bath ratio of pulp mass (g) to total volume of NaOH solution (mL) was 1:8. The impregnation time was 2 h. After impregnation and pressing, alkali cellulose was obtained. (2) subjecting the alkali cellulose to an aging treatment at a temperature of 15° C. for 3 hours to obtain aged alkali cellulose; (3) subjecting the aged alkali cellulose to a yellowing treatment at a temperature of 25° C. for a yellowing time of 40 min to obtain yellowed alkali cellulose; (4) Then, a dissolving alkali (a sodium hydroxide solution with a mass fraction of 10%) is added to dissolve, and after degassing, filtering, and ripening, a spinning solution with a methyl cellulose content of 7wt%, an alkali content of 5%, a ripening degree of 10ml, an esterification degree of 47, and a viscosity of 60s is obtained.

[0043] The difference between Example 5-6 and Example 5 is that the types of raw materials, amounts and experimental parameters for preparing the spinning solution are different. The specific differences are shown in Table 2: Table 2 Types, amounts and experimental parameters of raw materials used in preparing spinning solutions in Examples 1-3 Example 7 A printed heating fabric. The difference between this embodiment and embodiment 1 is that the graphene is pretreated by the following method: 20g of graphene, 8g of propylene glycol triglycidyl ether, 4g of tetrabutylammonium bromide, 2g of silane coupling agent (vinyltrimethoxysilane) and 40g of N,N-dimethylformamide are mixed uniformly in a mass ratio of 5:2:1:0.5:10, heated to 70°C in a nitrogen atmosphere, stirred for reaction for 2h, centrifuged and washed with pure water and anhydrous ethanol, and allowed to stand at 40°C for 2h to obtain pretreated graphene.

[0044] Example 8 A printed heating fabric. The difference between this embodiment and embodiment 4 is that the graphene is pretreated by the following method: 20g of graphene, 8g of propylene glycol triglycidyl ether, 4g of tetrabutylammonium bromide, 2g of silane coupling agent (vinyl tri(β-methoxyethoxy)silane) and 60g of N,N-dimethylformamide are mixed uniformly in a mass ratio of 5:2:1:0.5:15, heated to 80°C in a nitrogen atmosphere, stirred for reaction for 3h, centrifuged and washed with pure water and anhydrous ethanol, and allowed to stand at 50°C for 2h to obtain pretreated graphene.

[0045] Example 9 A printed heating fabric. The difference between this embodiment and embodiment 1 is that in step S3, the surface of the fabric is sanded, the sanding speed is 800r / min, the sanding tension is 30Kg, and the running speed of the fabric grey cloth is 6m / min.

[0046] Example 10 A printed heating fabric. The difference between this embodiment and embodiment 4 is that in step S3, the surface of the fabric is sanded, the sanding speed is 1000r / min, the sanding tension is 40Kg, and the running speed of the fabric grey cloth is 10m / min.

[0047] Embodiment 11 A printed heating fabric. The difference between this embodiment and embodiment 8 is that in step S3, the surface of the fabric is sanded, the sanding speed is 1000r / min, the sanding tension is 40Kg, and the running speed of the fabric grey cloth is 10m / min.

[0048] Example 12 A printed heating fabric, the difference between this embodiment and embodiment 1 is that the amount of graphene used in step S1 is 20% of the weight of the textile stock solution.

[0049] Comparative Example Comparative Example 1 A printed heating fabric, the difference between this embodiment and embodiment 1 is that step S1 is omitted, and in step S3, polymer fibers and polymer fiber-spun composite yarns are used.

[0050] Comparative Example 2 A printed heating fabric, the difference between this embodiment and embodiment 1 is that step S2 is omitted, and viscose fiber and viscose fiber spun composite yarn are used in step S3.

[0051] Comparative Example 3 A printed heating fabric, the difference between this embodiment and embodiment 1 is that the mineral powder is omitted.

[0052] Comparative Example 4 A printed heating fabric, the difference between this embodiment and embodiment 1 is that in step S1, graphene and spinning solution are simply stirred.

[0053] Comparative Example 5 A printed heating fabric, the difference between this embodiment and embodiment 1 is that in step S3, the graphene and the slices are stirred together.

[0054] Test method / test method Warmth retention: According to the national standard GB / T11048-2008 "Determination of thermal resistance and moisture resistance of textiles under steady-state conditions of biological comfort", thermal resistance and moisture resistance tester is used for thermal resistance and moisture resistance test.

[0055] Air permeability: refer to GB / T5453 / 1997 to test the air permeability, and prepare the printed heating fabrics in the embodiment and the comparative example by cutting the samples with a size of 20 mm*22 mm, pressurizing them with a pressure of 100 Pa, testing the temperature at (20±2)°C, and the humidity at (65±2)%.

[0056] Softness: Softness test: 180 people were selected, including 60 people aged 10-20, 60 people aged 20-40, and 60 people aged 40-60. The printed heating fabrics prepared in Examples 1-12 and Comparative Examples 1-5 were rubbed back and forth on their arms, and the number of people who thought the printed heating fabrics were soft was recorded.

[0057] Tear strength: Tested according to GB / T 3917-1:2009 "Tear properties of fabrics - Part 1 - Determination of tear strength by impact pendulum method".

[0058] Printing stability: Cut the 3M tape into a width*length of 1cm*25cm, and then stick the cut 3M tape on the temperature-sensitive ink layer, compact it, let it stand for 5 minutes, then tear off the 3M tape and observe whether there is any temperature-sensitive ink layer left on the 3M tape. The experimental data is shown in Table 3: Table 3 Experimental data of Examples 1-12 and Comparative Examples 1-5 Comparing Example 1 with Comparative Examples 1-2, the warmth retention, softness and air permeability in Comparative Example 1 are lower than those in Example 1, and a residual temperature-sensitive ink layer remains in the printing stability test, but the tear strength is higher than that in Example 1; the air permeability and tear strength in Comparative Example 2 are lower than those in Example 1, and no residual temperature-sensitive ink layer remains in the printing stability test, but the warmth retention and softness are higher than those in Example 1, indicating that in the present application, by using viscose fibers made of graphene, spinning solution and mineral powder and polymer fibers made of graphene, slices and mineral powder together, the thermal insulation performance, air permeability, softness, tear strength and printing stability of the fabric can be improved at the same time.

[0059] Comparing Example 1 with Comparative Examples 3-5, the warmth retention, softness, air permeability and tear strength of Comparative Examples 3-5 are all lower than those of Example 1, indicating that adding an appropriate amount of mineral powder, grinding the graphene with the textile stock solution and slices before spinning can effectively improve the warmth retention, air permeability, softness and tear strength of the fabric.

[0060] Comparing Example 1 with Examples 4-6, the warmth retention, softness, air permeability and tear strength of Examples 4-6 are all higher than those of Example 1, indicating that the spinning solution prepared by the present application can effectively improve the warmth retention, air permeability, softness and tear strength of the fabric.

[0061] By comparing Example 1 with Example 7, the warmth retention, softness, air permeability and tear strength of Example 7 are all higher than those of Example 1; By comparing Example 4 with Example 8, the warmth retention, softness, air permeability and tear strength of Example 8 are all higher than those of Example 4; It can be seen from the data of Examples 1 and 7, 4 and 8 that pre-treating graphene by the method of the present application can effectively improve the thermal insulation performance, air permeability, softness and tear strength of the fabric.

[0062] By comparing Example 1 with Example 9, the warmth retention, softness and air permeability of Example 9 are all higher than those of Example 1; By comparing Example 4 with Example 10, the warmth retention, softness and air permeability of Example 10 are higher than those of Example 4; By comparing Example 8 with Example 11, the warmth retention, softness and breathability of Example 8 are all higher than those of Example 11; It can be seen from the data of Examples 1 and 7, 4 and 8, and 8 and 11 that the thermal insulation performance, air permeability and softness of the fabric can be effectively improved by adding the sanding step.

[0063] Comparing Example 1 with Example 12, the warmth retention, softness, air permeability and tear strength of Example 1 are all higher than those of Example 12, indicating that adding an appropriate amount of graphene is beneficial to improving the warmth retention, air permeability, softness and tear strength of the fabric.

[0064] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A process for preparing a printed heating fabric, characterized in that: The method comprises the following preparation steps: S1, grinding graphene and spinning solution together, adding mineral powder to mix, obtaining a mixture, spinning into filaments by wet spinning process, and then drawing, oiling, drying and heat setting the filaments to obtain viscose fibers; S2, grinding the graphene and the slice together, adding mineral powder to mix, heating and melting, extruding, and spinning to obtain polymer fibers; S3, spinning the viscose fiber and the polymer fiber into composite yarn, and then spinning the composite yarn into fabric; S4, printing temperature-changing ink on the surface of the fabric to obtain a printed heating fabric.

2. A process for preparing a printed heating fabric according to claim 1, characterized in that: In step S1, the amount of graphene used is 5-15% of the weight of the spinning solution, and the amount of mineral powder used is 5-10% of the weight of the spinning solution.

3. A process for preparing a printed heating fabric according to claim 2, characterized in that: In step S1, the amount of graphene used is 5-15% of the weight of the slice, and the amount of mineral powder used is 10-15% of the weight of the slice.

4. A process for preparing a printed heating fabric according to claim 1, characterized in that: In step S3, the surface of the fabric is subjected to a sanding treatment, the sanding speed is 800-1000 r / min, the sanding tension is 30-40 kg, and the running speed of the fabric grey cloth is 6-10 m / min.

5. A process for preparing a printed heating fabric according to claim 4, characterized in that: The spinning solution is prepared by the following method: (1) adding the pulp to a NaOH solution for alkalization by soaking, adding γ-mercaptopropyltriethoxysilane during soaking, the amount of which is 0.1-0.3% of the weight of the pulp, the bath ratio of the pulp mass (g) to the total volume of the NaOH solution (mL) is 1:8-10, the soaking time is 2-4 hours, and the alkali cellulose is obtained after soaking and pressing; (2) subjecting the alkali cellulose to an aging treatment at a temperature of 15-20° C. for 3-4 hours to obtain aged alkali cellulose; (3) subjecting the aged alkali cellulose to a yellowing treatment at a temperature of 25-30° C. for a time of 40-50 min to obtain yellowed alkali cellulose; (4) Then, alkali is added to dissolve, and after degassing, filtering and ripening, a spinning solution with a methyl cellulose content of 7-9wt%, an alkali content of 5-6%, a ripening degree of 10-12ml, an esterification degree of 47-49, and a viscosity of 60-62s is obtained.

6. A process for preparing a printed heating fabric according to claim 4, characterized in that: The graphene is pretreated by the following method: Graphene, propylene glycol triglycidyl ether, tetrabutylammonium bromide, silane coupling agent and N, N-dimethylformamide are uniformly mixed in a mass ratio of 5:2:1:0.5:10-15, heated to 70-80°C in a nitrogen atmosphere, stirred for reaction for 2-3 hours, centrifuged and washed with pure water and anhydrous ethanol, and allowed to stand at 40-50°C for 2-3 hours to obtain pretreated graphene.

7. A process for preparing a printed heating fabric according to claim 1, characterized in that: The mineral powder includes at least one of expanded pearlite powder, diatomaceous earth powder, dolomite powder, talc powder and mica powder.

8. A process for preparing a printed heating fabric according to claim 1, characterized in that: In step S1, the spinning is ejected through a spinneret, the diameter of the spinneret is 0.05 mm-0.1 mm, and the ejection speed of the spinneret is 50-60 m / min.

9. A process for preparing a printed heating fabric according to claim 1, characterized in that: In step S1, the coagulation bath used in the spinning process includes 80-110 g / L sulfuric acid, 200-230 g / L sodium sulfate and 50-70 g / L zinc sulfate, and the temperature is 50-60°C.

10. A product of the printing heating fabric preparation process according to any one of claims 1 to 9, characterized in that: The product comprises a fabric layer and a temperature-sensitive ink layer coating the surface of the fabric layer, and is prepared by the printed heating fabric preparation process described in any one of claims 1-9.

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