Raised warm-keeping fabric and preparation method thereof

Abstract

The preparation method comprises the following steps that first raising is conducted, specifically, yarn is arranged side by side to form a yarn plane, then first raising and first activating agent treatment are conducted in sequence, and raised side-by-side knitting wool A is obtained; carding: carding the side-by-side knitting wool A along the length direction of the knitting wool to obtain knitting wool B; knitting: knitting the wool B on the base cloth to obtain a wool blank A; carrying out second raising, namely heating the pile blank A, and carrying out second activating agent and second raising treatment in sequence to obtain a pile blank B; shearing: shearing the wool blank B to obtain the raised warm-keeping fabric; the first activating agent is prepared from polyvinylpyrrolidone, an emulsifying dispersant, a thermal decomposition agent and a solvent; the second activating agent containing the dimer acid type polyester diol is the activating agent containing the dimer acid type polyester diol, through the two-time fuzzing process, the first activating agent and the second activating agent are combined, so that the gigging thermal fabric obtains a good thermal effect, and the gigging thermal fabric is not prone to hair falling.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fabric preparation, in particular to a preparation method of a raised warm-keeping fabric. BACKGROUND

[0002] With the improvement of people's living standards, the demand for various textiles is increasing, and warm-keeping fabric as an important type of textile has a wide range of applications in clothing, home textiles and many other fields. The performance of the warm-keeping fabric directly affects the use experience and market competitiveness of the product. High-quality warm-keeping fabric can provide people with a comfortable and warm feeling in cold environments, and also promotes the continuous development of related industries. At the same time, consumers not only pay attention to the warmth-keeping performance of the warm-keeping fabric, but also have higher requirements on softness, durability and other aspects, which prompts researchers and enterprises to continuously explore new technologies and processes to meet market demand.

[0003] In the past, in order to prepare the warm-keeping fabric, some relatively traditional technical means are usually adopted in the industry. The common method is to increase the thickness of the fabric to improve the warmth-keeping performance, and to use thicker materials to block the loss of heat. Some will choose to mix natural animal hair into the fabric to enhance the warmth-keeping effect by taking advantage of the good warmth-keeping properties of animal hair. In addition, simple coating treatment of ordinary fabric is also one of the commonly used methods, which forms a thin film on the surface of the fabric to reduce air circulation, thereby achieving a certain warmth-keeping purpose. Some manufacturers also use composite fabric method to stack fabrics with different properties together to achieve warmth-keeping by taking advantage of their respective advantages.

[0004] However, these existing technical means have obvious defects. Although thickening the fabric can improve the warmth-keeping efficiency to some extent, it will make the fabric heavy, reduce the comfort and flexibility of wearing, and the cost is also relatively high. Mixing natural animal hair into the fabric is prone to hair loss, which not only affects the appearance, but also may cause allergy and other problems. The simple coating treatment and the composite fabric method have generally low warmth-keeping efficiency and cannot meet people's demand for high-efficiency warmth-keeping. SUMMARY

[0005] The purpose of the present application is to overcome the above technical problems, and a raised warm-keeping fabric and a preparation method thereof are provided. In a first aspect, a preparation method of a raised warm-keeping fabric is provided, which is prepared by the following method: First raising: the yarns are arranged side by side to form a yarn plane, and then first raising and first activator treatment are sequentially performed to obtain side-by-side raised yarn A; Carding: the side-by-side raised yarn A is carded along the length direction of the raised yarn to obtain raised yarn B; Knitting: the raised yarn B is knitted on the base fabric to obtain raised fabric A; Second raising: the pile embryo A is heated and treated, and then sequentially passes through a second activator and a second raising treatment to obtain a pile embryo B; cutting: the pile embryo B is cut to obtain the raised warm-keeping fabric; The first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent and solvent; and the second activator containing dimer acid type polyester diol is an activator containing dimer acid type polyester diol.

[0006] Further preferably, the amount of polyvinylpyrrolidone and dimer acid type polyester diol is 1-5 wt%.

[0007] By adopting the above technical solution, the two raising treatments are synergistic with each other, the first raising is directed to the yarn, giving the yarn an initial bulky structure, improving the subsequent processing convenience and laying a foundation for the second raising, and the second raising is directed to the pile embryo A, further improving the surface bulkiness of the fabric on the basis of the first raising, making the pile more bulky, and thus improving the warm-keeping rate; in the first raising process, the yarn treated by raising is treated by the first treatment agent, the polyvinylpyrrolidone in the first treatment agent forms a film in combination with the emulsifying dispersant, promotes the dispersion of the decomposition agent and the wettability and surface activity of the yarn, forms a film on the surface of the yarn after bulking, makes the fibers on the surface of the side-by-side pile A slightly shrink during carding, is beneficial to subsequent weaving, and the thermal decomposition agent decomposes during the heating treatment of the pile embryo A, promotes the fibers of the pile embryo A to be more bulky, is beneficial to carding and the second raising treatment, and further improves the bulkiness and warm-keeping effect; the dimer acid type polyester diol in the second treatment agent can improve the softness and smoothness of the fabric, making the fabric more comfortable to touch, and at the same time, is helpful to forming more uniform and delicate pile during the raising process of the fabric. Further, when the amount of polyvinylpyrrolidone and dimer acid type polyester diol is 1-5 wt%, the fabric has the advantages of dense and bulky dispersed pile, etc. by cooperating with the process, and the overall performance is further improved, the warm-keeping rate of the warm-keeping fabric is as high as 78% or more, and the fabric is not easy to shed during use, and has strong practicality.

[0008] Preferably, the treatment of the first activator and the second activator both adopts a spraying treatment process, and the humidity of the surface of the fabric after spraying treatment is 65-75%.

[0009] Specifically, the treatment process of the first activator is that the first activator is sprayed on the plane formed by the side-by-side yarn after raising, and the surface humidity is 65-75%; and the treatment process of the second activator is that the activator containing dimer acid type polyester diol is sprayed on the surface of the heated pile embryo, and the surface humidity is 65-75%.

[0010] By adopting the above technical scheme, after the yarns are formed into a yarn plane side by side and the first raising is performed, the first activator is sprayed to the plane surface humidity of 65-75%, so that the polyvinylpyrrolidone in the first activator can better form a uniform film on the surface of the yarn to fix the bulky structure of the yarn, the fiber is promoted to orient and shrink in the carding process to improve the weaving applicability, the thermal decomposition agent is embedded into the fiber, and when the pile A is heated in the subsequent process, a micro air flow impact effect is generated to expand the fiber gap, thereby creating more optimal conditions for the second raising. Combined with the entire raising, carding, weaving, second raising, cutting process and the action of the activator, the raising effect and warmth retention can be further improved, and the lint phenomenon can be reduced.

[0011] By adopting the above technical scheme, the yarns are first formed into a yarn plane side by side, the first raising is performed, the first activator is treated, and the pile A is obtained after carding and weaving, so that the initial bulky structure of the yarn can be given, the bulky structure of the yarn can be fixed, and the weaving applicability can be improved. The pile A is heated, the thermal decomposition agent is decomposed by heat to expand the fiber gap, the second activator is sprayed on the surface of the heated pile to a surface humidity of 65-75%, the smoothness of the pile can be improved, and the pile can be uniformly distributed. Finally, the second raising and cutting are performed to obtain the raised warmth retention fabric, so that the surface layer fiber can be further puffed, the pile density and warmth retention rate of the fabric can be improved, and the lint rate in the raising process can be reduced due to the cross-linking action of the double activators.

[0012] Preferably, the temperature of the heating treatment of the pile A is 110-120℃, and the heating time is 1-3min.

[0013] By adopting the above technical scheme, the first raising gives the yarn an initial bulky structure, lays a foundation for the second raising. The polyvinylpyrrolidone in the first activator forms a film with the active dispersant to fix the bulky structure of the yarn, promotes the fiber to orient and shrink when carding, improves the weaving applicability, and the thermal decomposition agent is decomposed by heat to expand the fiber gap of the pile A. The pile A is heated at 110-120℃ for 1-3min, so that the thermal decomposition agent embedded in the fiber is decomposed by heat, a micro air flow impact effect is generated, the fiber gap is expanded, and more optimal fiber dispersion conditions are created for the second raising. The dimer acid type polyester dihydric alcohol in the second activator improves the smoothness of the pile and promotes the uniform distribution of the pile. Through two raisings, the use of corresponding activators and specific heating treatment, the pile density and warmth retention rate of the fabric are improved, and the warmth retention rate of the fabric exceeds 78%.

[0014] Preferably, the emulsifying dispersant is oleic acid polyethylene glycol phosphate and / or sucrose octasulfate sodium.

[0015] By adopting the above technical scheme, in the process of preparing the raised warm-keeping fabric, the first raising gives the yarn a bulky structure, and the second raising makes the surface layer fibers further fluffy to improve the warm-keeping rate; the polyvinylpyrrolidone and the active dispersing agent of the first activator form a film to fix the bulky structure of the yarn, and the fibers are oriented and shrunk when the yarn is combed, and the thermal decomposition agent is decomposed by heat to expand the gap between the pile fibers; the dimer acid type polyester dihydric alcohol of the second activator improves the smoothness of the pile and promotes uniform distribution; the oleic acid polyethylene glycol phosphate and / or sodium sucrose octasulfate serve as emulsifying dispersants for the second activator, can play a dispersing and emulsifying role, and cooperate with the overall process to make the fabric pile dense and fluffy and dispersed, the warm-keeping rate is more than 70%, the gram weight is 280-310 g / m 2 , and the lint rate is low.

[0016] Preferably, the emulsifying dispersant is composed of oleic acid polyethylene glycol phosphate and sodium sucrose octasulfate.

[0017] By adopting the above technical scheme, the yarn is first arranged side by side to form a plane, then the first raising, the first activator treatment are sequentially performed to obtain the side-by-side pile yarn A, the pile yarn B is obtained by combing the pile yarn A, then the pile A is woven on the base fabric, and then the pile B is obtained by sequentially performing the second activator treatment and the second raising treatment, and finally the raised warm-keeping fabric is obtained by cutting the pile. The first activator contains polyvinylpyrrolidone, an emulsifying dispersant, a thermal decomposition agent, and a solvent, the second activator contains dimer acid type polyester dihydric alcohol, an active dispersing agent, and a solvent, the amount of polyvinylpyrrolidone and dimer acid type polyester dihydric alcohol is 1-5 wt%, and the emulsifying dispersant is composed of oleic acid polyethylene glycol phosphate and sodium sucrose octasulfate. The double raising can realize synergistic effect, so that the fabric pile density is improved and the warm-keeping rate is more than 78%. Through the film-forming-decomposition two-stage action of the first activator, the bulky structure of the yarn is fixed and the weaving applicability is improved, which creates better fiber dispersion conditions for the second raising. The second activator is used to reduce the surface tension of the fibers, improve the smoothness of the pile, and promote the uniform distribution of the pile. The full-process technology can also be realized, so that the cross-linking effect of the double activators reduces the lint rate. At the same time, the sodium sucrose octasulfate plays a dispersing and emulsifying role.

[0018] Preferably, the first activator is composed of polyvinylpyrrolidone, an emulsifying dispersant, a thermal decomposition agent, and a solvent in a weight ratio of (1-5):(0.5-3):1:(91-97.5).

[0019] By adopting the above technical solution, using polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent and solvent in a specific weight ratio to form a first activator, combined with the process of first arranging yarns side by side to form a yarn plane, then sequentially performing the first napping, first activator treatment, combing, weaving, heating the pile A, and then sequentially performing the second activator and second napping treatment, and finally shearing, the first activator can better fix the loose structure of the yarn in the film-forming stage, and generate a micro-airflow impact effect in the thermal activation stage to expand the gaps between the pile fibers. This results in a dense and loosely dispersed napped warm fabric, further improving the overall performance and warmth of the fabric, while avoiding the increased shedding rate of the final product due to the large pulling force during the subsequent second napping.

[0020] Preferably, the active dispersant is a polyethylene glycol-polysiloxane-polyethylene glycol and / or a polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer.

[0021] By adopting the above technical solution, using polyethylene glycol-polysiloxane-polyethylene glycol and / or polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymers as active dispersants, combined with a second activator formed by dimer acid-type polyester diols, the pile dispersion can be promoted in the second pile raising process, facilitating subsequent pile raising treatments. This results in a final product with dense and fluffy pile, stable structure, low shedding rate, a warmth retention rate of over 70%, and a basis weight of 280-310 g / m². 2 The fleece-lined, warm fabric.

[0022] Preferably, the second activator containing dimer acid type polyester diol is composed of dimer acid type polyester diol, active dispersant, and solvent in a weight ratio.

[0023] By employing the above technical solution, a second activator is formed by combining dimer acid-type polyester diol, active dispersant, and solvent in a specific weight ratio. This enhances the fabric's softness and smoothness, making it more comfortable to the touch. It also strengthens the fabric's antistatic, antibacterial, and anti-mildew properties to increase added value. Furthermore, it helps form a more uniform and delicate pile during the fabric raising process, promoting fiber surface softening and fluffiness, making the fibers easier to lift. This is combined with first forming a yarn plane by arranging the yarns side-by-side and then sequentially performing the first raising and first activator treatments, followed by combing the side-by-side yarns along their length. The yarn is then woven into the base fabric, followed by heat treatment of the pile and sequentially passing it through a second activator and a second pile-raising treatment. Finally, the pile is sheared. The first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent, and solvent, with polyvinylpyrrolidone and dimer acid type polyester diol each used in amounts of 1-5 wt%. This achieves a synergistic effect of double pile raising, further improving the overall pile raising effect and warmth retention, resulting in a warmth retention rate of over 78%. Furthermore, the cross-linking effect of the double activator reduces the shedding rate to <0.5%, improving the practicality of the fabric.

[0024] Secondly, a fleece-lined thermal fabric, prepared by a method for preparing fleece-lined thermal fabric, wherein the fleece-lined thermal fabric has a weight of 280-310 g / m². 2 The insulation rate is over 70%.

[0025] By adopting the above technical solution, the yarns are first arranged side by side to form a plane, and then subjected to a first napping and a first activating agent treatment to obtain side-by-side pile yarn A. After combing, pile yarn B is obtained and woven into the base fabric to obtain pile blank A. After heat treatment of pile blank A, it is subjected to a second activating agent and a second napping treatment to obtain pile blank B. Finally, the pile is sheared to obtain the napped thermal insulation fabric. At the same time, the first activating agent is limited to polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent, and solvent, and the second activating agent is limited to dimer acid type polyester diol, active dispersant, and solvent. The amount of polyvinylpyrrolidone and dimer acid type polyester diol is 1-5wt%, which can make the yarn fluffy, improve the convenience of re-naping, make the pile on the fabric surface more fluffy, improve the softness and smoothness of the fabric, and help to form a more uniform and delicate pile. Combined with the process, the advantages of dense and fluffy pile can be obtained, and the final weight is 280-310g / m². 2 It is a fleece-lined thermal fabric with a warmth retention rate of over 70% and is not prone to shedding during use.

[0026] In addition, the fleece-lined thermal fabric obtained in this application can be further processed, such as dyeing and antistatic treatment, to give the fleece-lined thermal fabric more functions.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The first napping gives the yarn a fluffy feel, and the second napping further increases the fluffiness of the fabric surface on the basis of the first napping, making the pile even fluffier and increasing the pile density of the fabric. The warmth retention rate can reach more than 78%, which solves the problem of low warmth retention efficiency of existing technologies. 2. Polyvinylpyrrolidone in the first activator causes the fluffy and parallel fibers on the surface of the pile A to shrink slightly during combing, which is beneficial for subsequent weaving. The thermal decomposition agent decomposes when heated, promoting the fibers on the pile A to become more fluffy, which facilitates the second pile raising and improves the pile raising effect. 3. The dimer acid type polyester diol in the second activator can improve the softness and smoothness of the fabric, making the pile more uniform and delicate, avoiding the problem of poor fabric comfort in the existing technology. Moreover, through two pile raising and activator treatments, the fabric is less prone to shedding during use, thus improving its practicality. Detailed Implementation

[0028] The present application will be further described in detail below with reference to the embodiments.

[0029] Polyvinylpyrrolidone: viscosity-average molecular weight 1000-2000; Dimer acid type polyester diol: Jining Tangyi Chemical Co., Ltd. Hydroxyl value: 56mgKOH / g; The molecular formula of polyethylene glycol-polysiloxane-polyethylene glycol is [C2H4O]. n [C2H6OSi]m[C2H4O] n , where m and n are both 1-10.

[0030] Polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer, CAS No. 9003-11-6; Oleic acid polyethylene glycol phosphate PEG400MO (Hai Shi Hua) Sodium sucrose octasulfate has the molecular formula C 12 H 14 Na8O 35 S8 The thermal decomposition agent is potassium persulfate with a particle size of 1-5 micrometers. Example

[0031] Example 1 A method for preparing a fleece-lined thermal fabric includes the following steps: The first activator consists of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent, and solvent; The second activator containing dimer acid type polyester diol is composed of dimer acid type polyester diol, active dispersant, and solvent (65% ethanol solution by mass) in a weight ratio of 3.3:1.7:95; the first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent (potassium persulfate), and solvent (anhydrous ethanol) in a weight ratio of 3.7:1.3:1:94.

[0032] The active dispersant is a polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer. The emulsifying dispersant is polyethylene glycol oleate.

[0033] The yarn is composed of 70% acrylic and 30% spandex, with the fineness of the acrylic and spandex fibers being 3.1D and the fiber strength being 21cN / dtex.

[0034] The base fabric is made from 75D base yarn through knitting, and its weight is 100g / m². 2 .

[0035] First napping: The yarns are arranged side by side to form a yarn plane with a spacing of 0.1mm between adjacent yarns. The first napping is performed sequentially with 36 rollers. After the first napping, the yarns are conveyed to a spraying device and sprayed with a first activator to make the humidity of both sides 65%, thus obtaining the napped yarn A. Combing: The parallel yarns A are fed into the combing mechanism and combed along the length of the yarns to obtain yarn B; Weaving: The yarn B is fed into the weaving equipment and woven into the base fabric to obtain the pile blank A; Second napping: Heat the nap blank A at 115℃ for 2 minutes to decompose the thermal decomposition agent. Then, it enters the spraying equipment and sprays both sides with the second activator, ensuring that the humidity of both sides is 65%. Then, it enters the napping equipment for the second napping treatment to obtain the nap blank B. Shearing: The fleece base B is sheared, and the remaining surface fleece is removed to form a smooth, piled, warm fabric. The weight of the piled, warm fabric is 300g / m². 2 .

[0036] The weaving method employs a double-layer weaving technique; both the first and second raising processes utilize a rotating fruit raising machine.

[0037] Example 2 The difference between Example 2 and Example 1 lies in the first activator and some process parameters, as detailed below: Spray until the surface humidity reaches 70%; The heat treatment temperature for preform A was 120℃, and the heating time was 1 min. The first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent, and solvent in a weight ratio of 5:3:1:91.

[0038] Example 3 The difference between Example 3 and Example 1 lies in the first activator and some process parameters, as detailed below: Spray until the surface humidity reaches 75%; The heat treatment temperature for preform A was 110℃, and the heating time was 3 minutes. The first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent, and solvent in a weight ratio of 1:0.5:1:97.5.

[0039] Example 4 The difference between Example 4 and Example 1 is that the active dispersant is a polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer.

[0040] Example 5 The difference between Example 5 and Example 1 is that the active dispersant is composed of polyethylene glycol-polysiloxane-polyethylene glycol and polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymers in a weight ratio of 1:1.

[0041] Example 6 The difference between Example 6 and Example 5 is that the emulsifying dispersant is sucrose octasulfate.

[0042] Example 7 The difference between Example 7 and Example 5 is that the emulsifying dispersant is composed of polyethylene glycol oleate and sodium sucrose octasulfate in a weight ratio of 1:2.

[0043] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that a single-stage napping process is used, the specific process of which is as follows: Weaving: The yarn is fed into a weaving machine and woven into the base fabric to obtain pile A; Second napping: Heat the nap blank A at 115℃ for 2 minutes to decompose the thermal decomposition agent. Then, it enters the spraying equipment and sprays both sides with the second activator, ensuring that the humidity of both sides is 65%. Then, it enters the napping equipment for the second napping treatment to obtain the nap blank B. Shearing: The fleece base B is sheared, and the remaining surface fleece is removed to form a smooth, piled, warm fabric. The weight of the piled, warm fabric is 300g / m². 2 .

[0044] (The rest is the same as in Example 1) Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the first activator is not used for treatment. The specific process is as follows: First raising: The yarns are arranged side by side to form a yarn plane with a spacing of 0.1 mm between adjacent yarns. The first raising is performed sequentially with 36 rollers to obtain the side-by-side raised yarn A (the rest is the same as in Example 1).

[0045] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the thermal decomposition agent replaces the solvent in equal amounts.

[0046] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the dimer acid type polyester diol is replaced with polyethylene glycol in equal amounts.

[0047] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that a second activator is not used for treatment, and the specific preparation process for its second napping is as follows: Second napping: Heat the nap A at 115°C for 2 minutes to decompose the thermal decomposition agent, and then put it into the napping equipment for a second napping process to obtain nap B (the rest is the same as in Example 1).

[0048] Performance testing The fleece-lined thermal fabrics obtained in Examples 1-7 and Comparative Examples 1-5 were subjected to the following performance tests.

[0049] Detection methods / test methods 1. Warmth retention rate The heat retention rate was tested according to Method A of GB / T 11048-1989, using a flat plate.

[0050] 2) Shedding rate The test shall be conducted in accordance with GB / T 4802.1-2008, and the shedding rate shall be calculated. If the shedding rate is greater than 0.5%, it shall be recorded as unqualified, otherwise it shall be recorded as qualified.

[0051] The specific data from the above experiments are shown in Table 1. Table 1. Experimental data of Examples 1-7 and Comparative Examples 1-5 Experimental item Warm-keeping rate (%) Pilling rate Example 1 80.6 Pass Example 2 79.8 Pass Example 3 78.0 Pass Example 4 81.3 Pass Example 5 83.8 Pass Example 6 83.1 Pass Example 7 84.5 Pass Comparative Example 1 62.3 Pass Comparative Example 2 65.8 Fail Comparative Example 3 68.9 Pass Comparative Example 4 67.1 Fail Comparative Example 5 66.2 Fail Based on Example 1 and Comparative Examples 1-5, and referring to Table 1, it can be seen that Comparative Examples 2 and 4-5 both exhibited a shedding rate greater than 0.5%, indicating that the process of this application and the specific composition of the first and second activators can achieve a better napping effect, avoiding the impact of high tensile force on the final product's structural stability during the napping process and reducing shedding. Furthermore, the warmth retention rate of Comparative Examples 1-5 was less than 70%, while Example 1 reached over 80%, demonstrating that the process and conditions of this application can achieve a better napping effect and improve the warmth retention rate.

[0052] The fuzzing process involves a certain amount of force. If it is not activated or the activation effect is poor, it will cause pulling, affecting the stability of the final product structure, and thus making the final product prone to shedding.

[0053] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing a fleece-lined thermal fabric, characterized in that, Includes the following steps: First raising: The yarns are arranged side by side to form a yarn plane, and then the first raising and first activator treatment are performed in sequence to obtain the raised side-by-side pile yarn A; Combing: Comb the side-by-side yarn A along its length to obtain yarn B; Weaving: Weave yarn B into the base fabric to obtain pile blank A; Second napping: Heat-treat nap A, then pass it through a second activator and a second napping treatment in sequence to obtain nap B; Shearing: Shear the fleece blank B to obtain a fleece-lined warm fabric; The first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent, and solvent; the second activator containing dimer acid type polyester diol is an activator containing dimer acid type polyester diol.

2. The method for preparing a fleece-lined thermal fabric according to claim 1, characterized in that: Both the first activator and the second activator are treated with a spraying process, and the surface humidity of the fabric is 65-75% after spraying.

3. The method for preparing a fleece-lined thermal fabric according to claim 1, characterized in that: The temperature for heat treatment of the preform A is 110-120℃, and the heating time is 1-3 minutes.

4. The method for preparing a fleece-lined thermal fabric according to claim 1, characterized in that: The amount of polyvinylpyrrolidone in the first activator and the amount of dimer acid polyester diol in the second activator containing dimer acid polyester diol are both 1-5 wt.

5. The method for preparing a fleece-lined thermal fabric according to claim 4, characterized in that: The first activator is composed of polyvinylpyrrolidone, emulsifying dispersant, thermal decomposition agent and solvent in a weight ratio of (1-5):(0.5-3):1:(91-97.5).

6. The method for preparing a fleece-lined thermal fabric according to claim 1, characterized in that: The emulsifying dispersant is polyethylene glycol oleate and / or sodium sucrose octasulfate.

7. The method for preparing a fleece-lined thermal fabric according to claim 1, characterized in that: The second activator containing dimer acid type polyester diol is composed of dimer acid type polyester diol, active dispersant, and solvent.

8. The method for preparing a fleece-lined thermal fabric according to claim 7, characterized in that: The active dispersant is a polyethylene glycol-polysiloxane-polyethylene glycol and / or a polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymer.

9. The method for preparing a fleece-lined thermal fabric according to claim 8, characterized in that: The active dispersant is composed of polyethylene glycol-polysiloxane-polyethylene glycol and polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymers.

10. A fleece-lined thermal fabric, characterized in that, The fleece-lined thermal fabric is prepared by the method according to any one of claims 1-9, wherein the fleece-lined thermal fabric has a basis weight of 280-310 g / m². 2 The insulation rate is over 70%.