An artificial plush composite fabric and its preparation method

Abstract

The present invention relates to an artificial plush composite fabric and a preparation method thereof, belonging to the technical field of flocking fabrics. The fabric is composed of a base fabric layer, an adhesive layer and a flannelette layer. Among them, the flannelette layer is made of modified polyurethane fluff, which includes, by weight: 50-60 parts of 4,4'-diphenylmethane diisocyanate, 110-140 parts of anti-fouling modified silicone oil, 28-36 parts of 1,4-butanediol, 1.3-1.6 parts of antioxidant and 35-50 parts of dimethylacetamide; the anti-fouling modified silicone oil is based on silicone oil with branched amino groups and terminal methoxy groups, and side-chain fluorine groups are introduced through the reaction of trifluorobutyric acid and branched amino groups. By using hydrolysis reaction, hydroxyl modification is formed at the end of the silicone oil chain. The fluff layer prepared after its participation in polymerization has good stain resistance and easy detergency, and at the same time has a smooth hand feeling.

Description

Technical Field

[0001] The present invention belongs to the technical field of flocked fabrics, and specifically relates to an artificial plush composite fabric and a preparation method thereof. Background Art

[0002] Electrostatic flocked fabric is a novel textile product that has emerged in recent years. It belongs to the flocked fabric like woven tufted and knitted velveteen fabrics. It is mainly composed of a base fabric, an adhesive, and fluff, but it is not made by weaving. Instead, it uses a high-voltage electrostatic field to implant the fluff into the base fabric coated with an adhesive. After curing, a plush fabric is formed. Compared with traditional textiles, the surface properties of the fabric can be regulated by the properties of the fluff, and it has high designability, and is widely used in curtains, sofas, wall coverings, carpets, and clothing.

[0003] Benefiting from the designability of the electrostatic flocking technology, the advantages of various fabrics can be combined. For example, nylon is strong and wear-resistant, with excellent mechanical properties, but it is not light-resistant; spandex has poor strength, but it is acid-resistant, alkali-resistant, and light-resistant. Using nylon as the base fabric and spandex as the fluff, the plush fabric made by electrostatic flocking has good comprehensive performance. However, the fluff layer on the surface is easy to adhere to stains and is not easy to clean, and the daily cleaning and maintenance are difficult and have a long cycle, which has become the biggest concern for people when purchasing plush products. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background art, the purpose of the present invention is to provide an artificial plush composite fabric and a preparation method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An artificial plush composite fabric, comprising a base fabric layer, an adhesive layer, and a flannel layer, and the fabric is made by electrostatic flocking. The flannel layer is made of modified polyurethane fluff, and it includes the following raw materials according to weight parts:

[0007] 4,4'-diphenylmethane diisocyanate 50 - 60 parts, anti-stain modified silicone oil 110 - 140 parts, 1,4-butanediol 28 - 36 parts, antioxidant 1.3 - 1.6 parts, and dimethylacetamide 35 - 50 parts;

[0008] The anti-stain modified silicone oil is prepared by the following method:

[0009] Step A1: Mix trifluorobutyric acid, thionyl chloride, and acetone, heat up to 42 - 48 °C, apply mechanical stirring at 120 - 180 rpm, and carry out reflux reaction for 1.5 - 2 h to obtain a fluorinated modifier;

[0010] Further, the dosage ratio of trifluorobutyric acid, thionyl chloride and acetone is 0.1 mol: 0.12 - 0.14 mol: 40 - 50 mL. Thionyl chloride reacts with trifluorobutyric acid to form a fluorine-containing acyl chloride compound.

[0011] Step A2: Mix the composite modified silicone oil, triethylamine and tetrahydrofuran, control the temperature in a water bath at 10 - 20 °C, apply mechanical stirring at 360 - 420 rpm, slowly add the fluorination modifier, and control the total addition reaction time to be 3 - 4 h to obtain a fluorinated silicone oil matrix.

[0012] Further, the dosage ratio of the composite modified silicone oil, fluorination modifier, triethylamine and tetrahydrofuran is 100 g: 45 mmol: 5 - 7 mL: 80 - 100 mL. The composite modified silicone oil is a silicone oil with branched-chain amino modification and terminal methoxy capping, selected from Shin-Etsu KF-8001, provided by Guangzhou Situdyuan Chemical Co., Ltd. The fluorination modifier reacts with the branched-chain amino group of the composite modified silicone oil to graft fluorine-containing groups to the side chains of the silicone oil molecules.

[0013] Step A3: Mix the fluorinated silicone oil matrix and the methanol solution, add acetic acid to adjust the pH value to 3.5 - 4.5, stir at room temperature for 1 - 1.5 h, then raise the temperature to 40 - 50 °C, apply mechanical stirring at 800 - 1000 rpm, slowly drop hydrobromic acid, control the addition reaction time of hydrobromic acid to be 10 - 15 min, and then add ammonia water for neutralization to obtain the anti-fouling modified silicone oil.

[0014] Further, the dosage ratio of the fluorinated silicone oil matrix, methanol solution and hydrobromic acid is 100 g: 150 - 200 mL: 2 - 3 mL. The mass fraction of the methanol solution is 40 - 60%, and the mass fraction of hydrobromic acid is 33%. Using the methanol solution as the hydrolysis environment, under the action of acetic acid and hydrobromic acid, the terminal methoxy groups of the molecular chains of the fluorinated silicone oil matrix are gradually hydrolyzed to form terminal hydroxyl modification.

[0015] The modified polyurethane fluff is prepared by the following method:

[0016] Step B1: Dissolve the antioxidant in dimethylacetamide, add the anti-fouling modified silicone oil and mix, raise the temperature to 75 - 85 °C, apply mechanical stirring at 60 - 80 rpm, and intermittently add 4,4'-diphenylmethane diisocyanate, control the total addition reaction time to be 1.2 - 1.7 h to obtain a prepolymer solution.

[0017] Step B2: Cool the prepolymer solution to 55 - 65 °C, increase the stirring rate to 120 - 150 rpm, add 1,4-butanediol, and control the reaction time to be 2 - 2.5 h to obtain a spinning solution.

[0018] Step B3: Perform dry spinning on the spinning solution, wind and crush the filaments to obtain the modified polyurethane fluff.

[0019] Further, the crushing length of the modified polyurethane fluff is preferably 0.5 mm.

[0020] Further, the antioxidant is preferably antioxidant Chinox30N.

[0021] A method for preparing an artificial plush composite fabric specifically includes the following steps:

[0022] Step S1: Roll-coat an adhesive on the surface of the base fabric, send it into an electrostatic flocking machine, control the distance between the substrates to be 15 cm, the flocking voltage to be 45 kV, the flocking temperature to be 55 °C, and the implantation time to be 15 s, and implant the modified polyurethane fluff into the adhesive to obtain a blank;

[0023] Step S2: Transfer the blank into an oven, pre-bake it at 100 °C for 12 - 16 min first, then bake it at 150 °C for 5 - 7 min for shaping, and brush the hair after cooling to obtain the artificial plush composite fabric.

[0024] Advantages of the present invention:

[0025] The present invention provides a plush fabric composed of a nylon base fabric and modified polyurethane fluff. Among them, an anti-fouling modified silicone oil is introduced into the modified polyurethane fluff to participate in copolymerization, endowing the fluff layer of the fabric with good stain resistance, easy scrubbing performance and a smooth hand feeling; this anti-fouling modified silicone oil is prepared by acyl chlorination of trifluorobutyric acid with thionyl chloride to make a fluorinated modifier, which reacts with the branched-chain amino group of the composite modified silicone oil to graft a fluorine-containing group to the side chain of the silicone oil molecule to form a fluorinated silicone oil matrix. On the one hand, the side-chain fluorine group endows the polymer with good oil and water resistance to obtain good stain resistance, and on the other hand, it protects the amide structure remaining in the grafting reaction. Through reasonable process settings, with a methanol solution as the hydrolysis environment, under the action of acetic acid and hydrobromic acid, the terminal methoxy group of the fluorinated silicone oil matrix molecular chain is gradually hydrolyzed into a hydroxyl group, so that the anti-fouling modified silicone oil can be used as a raw material for polyurethane. The introduction of the silicone oil chain further enhances the water and wear resistance of the matrix, and at the same time endows the fluff with a smooth touch. Specific embodiments

[0026] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0027] Example 1

[0028] In this example, an artificial plush composite fabric is prepared, and the specific implementation process is as follows:

[0029] 1) Preparation of anti-fouling modified silicone oil

[0030] 1.1. Take trifluorobutyric acid, thionyl chloride and acetone, mix them by feeding, heat up to 48 °C in a water bath and keep it at a constant temperature, apply mechanical stirring at 180 rpm, and reflux for 1.5 h. During the reaction, the dosage ratio of trifluorobutyric acid, thionyl chloride and acetone is 0.1 mol: 0.14 mol: 50 mL. After the reaction, rotate and evaporate to remove acetone at 60 °C, and use a calcium oxide drying tube to absorb the tail gas. Take the rotary evaporation substrate to obtain a fluorinated modifier.

[0031] 1.2. Mix the composite modified silicone oil (silicone oil modified with branched amino groups and terminal methoxy groups, and the silicone oil model used in the examples is Shin-Etsu KF-8001, provided by Guangzhou Situduanyuan Chemical Co., Ltd.), triethylamine and tetrahydrofuran by feeding, control the temperature at 20 °C in an ice-water bath, apply mechanical stirring at 420 rpm, and slowly add the fluorinated modifier within 1.5 h. After complete addition, continue to stir and react at a constant temperature, and control the total addition reaction time of the fluorinated modifier to be 3 h. During the reaction, the dosage ratio of the composite modified silicone oil, the fluorinated modifier, triethylamine and tetrahydrofuran is 100 g: 45 mmol: 7 mL: 100 mL. After the reaction, rotate and evaporate under reduced pressure to remove tetrahydrofuran to obtain a fluorinated silicone oil matrix.

[0032] 1.3. Prepare a methanol solution with a mass fraction of 40%. Take the fluorinated silicone oil matrix and the methanol solution, feed and mix them at a high speed of 1500 rpm for 5 min, add acetic acid to adjust the pH value to 3.5, stir at 240 rpm at room temperature for 1 h, then heat up to 50 °C, apply mechanical stirring at 1000 rpm, and slowly add hydrobromic acid (the AR grade reagent with a mass fraction of 33% is used in the examples) to the mixed solution within 3 min. After dropping, continue to stir and react, and control the addition reaction time of hydrobromic acid to be 10 min. During the reaction, the dosage ratio of the fluorinated silicone oil matrix, the methanol solution and hydrobromic acid is 100 g: 200 mL: 3 mL. After the reaction, heat up to 60 °C and rotate and evaporate to remove ethanol, let it stand and cool for liquid separation, take the organic phase and wash it twice with water, and then take the organic phase and dry it to obtain the anti-fouling modified silicone oil.

[0033] 2) Preparation of modified polyurethane fluff

[0034] 2.1. Take 1.6 parts of antioxidant (the antioxidant with the model Chinox30N is used in the examples) and 50 parts of dimethylacetamide, mix and stir to dissolve them, then add 140 parts of anti-fouling modified silicone oil and mix. Heat up to 85 °C by electric heating, apply mechanical stirring at 80 rpm. Take 60 parts of 4,4'-diphenylmethane diisocyanate and divide it into two parts according to a mass ratio of 3:1. First add 3 / 4 of the raw materials, add the remaining raw materials after 30 min, and continue to stir and react at a constant temperature, and control the total addition reaction time to be 1.2 h to obtain a prepolymer solution.

[0035] 2.2 Cool the prepolymer solution to 65°C, increase the stirring rate to 150 rpm, add 28 parts of 1,4-butanediol, and stir and react at a constant temperature for 2 h to obtain a spinning solution.

[0036] 2.3 Form the spinning solution by dry spinning, wind up the tow, and cut the tow into short fiber fluffs of 0.5 mm using a crusher to obtain modified polyurethane fluff.

[0037] 3) Prepare artificial plush composite fabric

[0038] 3.1 Take a base fabric (nylon base fabric is used in the examples, the warp yarn count is 20D / 12F, and the weft yarn count is 20D / 24F), roll-coat an adhesive on the surface (a commercially available flocking adhesive with the model AH-1502E13 is used in the implementation), and the roll-coating amount is 120 g / m 2 , send the base fabric coated with the adhesive into an electrostatic flocking machine, control the distance between the substrate plates to be 15 cm, the flocking voltage to be 45 kV, the flocking temperature to be 55°C, and the implantation time to be 15 s, and implant the modified polyurethane fluff into the adhesive to obtain a blank.

[0039] Step S2: Transfer the blank into an oven, pre-bake it at 100°C for 16 min first, then bake it at 150°C for 5 min for shaping, and brush the fabric after cooling to obtain the artificial plush composite fabric.

[0040] Example 2

[0041] The specific implementation process for preparing the artificial plush composite fabric in this example is as follows:

[0042] 1) Prepare anti-fouling modified silicone oil

[0043] 1.1 Take trifluorobutyric acid, thionyl chloride, and acetone, put them into a mixture, heat them in a water bath to 42°C and keep the temperature constant, apply mechanical stirring at 120 rpm, and reflux and react for 2 h. During the reaction, the dosage ratio of trifluorobutyric acid, thionyl chloride, and acetone is 0.1 mol: 0.12 mol: 40 mL. After the reaction ends, rotate and evaporate to remove acetone at 60°C, and use a calcium oxide drying tube to absorb the tail gas. Take the rotary evaporation substrate to obtain a fluorinated modifier.

[0044] 1.2 Put the composite modified silicone oil, triethylamine, and tetrahydrofuran into a mixture, control the temperature at 10°C in an ice-water bath, apply mechanical stirring at 360 rpm, slowly add the fluorinated modifier within 2 h, and continue to stir and react at a constant temperature after complete addition. Control the total addition reaction time of the fluorinated modifier to be 4 h. During the reaction, the dosage ratio of the composite modified silicone oil, fluorinated modifier, triethylamine, and tetrahydrofuran is 100 g: 45 mmol: 5 mL: 80 mL. After the reaction ends, rotate and evaporate under reduced pressure to remove tetrahydrofuran to obtain a fluorinated silicone oil matrix.

[0045] 1.3. Prepare a methanol solution with a mass fraction of 60%. Charge the fluorinated silicone oil matrix and the methanol solution, and mix them at a high speed of 1500 rpm for 5 minutes. Add acetic acid to adjust the pH value to 4.5, stir at 240 rpm at room temperature for 1.5 hours, then raise the temperature to 40 °C, apply mechanical stirring at 800 rpm, and slowly add hydrobromic acid to the mixture within 5 minutes. After dropping, continue stirring and reacting, and control the reaction time for adding hydrobromic acid to be 15 minutes. During the reaction, the dosage ratio of the fluorinated silicone oil matrix, the methanol solution, and hydrobromic acid is 100 g: 150 mL: 2 mL. After the reaction, raise the temperature to 60 °C and rotary evaporate to remove ethanol, let it stand and cool, separate the liquid, take the organic phase and wash it twice with water, and then take the organic phase again for drying to obtain the anti-fouling modified silicone oil.

[0046] 2) Prepare the modified polyurethane fluff

[0047] 2.1. Charge 1.3 parts of antioxidant and 35 parts of dimethylacetamide, mix and stir to dissolve, then add 110 parts of anti-fouling modified silicone oil and mix. Heat with electricity to raise the temperature to 75 °C, apply mechanical stirring at 60 rpm. Take 50 parts of 4,4'-diphenylmethane diisocyanate and divide it into two parts according to the mass ratio of 2:1. First add 2 / 3 of the raw materials, add the remaining raw materials after 50 minutes, and continue stirring and reacting at a constant temperature. Control the total reaction time for adding to be 1.7 hours to obtain the prepolymer solution.

[0048] 2.2. Cool the prepolymer solution to 55 °C, increase the stirring rate to 120 rpm, add 36 parts of 1,4-butanediol, and stir and react at a constant temperature for 2.5 hours to obtain the spinning solution.

[0049] 2.3. Use dry spinning to form the spinning solution, wind up the tow, and use a crusher to cut the tow into short fibers with a length of 0.5 mm to obtain the modified polyurethane fluff.

[0050] 3) Prepare the artificial plush composite fabric

[0051] 3.1. Take the base fabric and roll-coat the adhesive on the surface, with a coating amount of 120 g / m 2 , send the base fabric coated with the adhesive into the electrostatic flocking machine, control the distance between the substrates to be 15 cm, the flocking voltage to be 45 kV, the flocking temperature to be 55 °C, and the implantation time to be 15 s, and implant the modified polyurethane fluff into the adhesive to obtain the blank.

[0052] Step S2: Transfer the blank to the oven, pre-bake it at 100 °C for 12 minutes first, then bake it at 150 °C for 7 minutes for shaping, and brush the hair after cooling to obtain the artificial plush composite fabric.

[0053] Example 3

[0054] In this example, the artificial plush composite fabric is prepared, and the specific implementation process is as follows:

[0055] 1) Preparation of anti-fouling modified silicone oil

[0056] 1.1. Take trifluorobutyric acid, thionyl chloride and acetone and mix them by feeding. Heat them in a water bath to 45 °C and keep them at a constant temperature. Apply mechanical stirring at 180 rpm and reflux for 1.8 h. During the reaction, the dosage ratio of trifluorobutyric acid, thionyl chloride and acetone is 0.1 mol: 0.13 mol: 50 mL. After the reaction, rotate and evaporate to remove acetone at 60 °C, and use a calcium oxide drying tube to absorb the tail gas. Take the rotary evaporation substrate to obtain a fluorinated modifier.

[0057] 1.2. Mix the composite modified silicone oil, triethylamine and tetrahydrofuran by feeding. Control the temperature at 15 °C in an ice-water bath, apply mechanical stirring at 420 rpm, and slowly add the fluorinated modifier within 1.6 h. After complete addition, continue to stir and react at a constant temperature, and control the total addition reaction time of the fluorinated modifier to be 3.2 h. During the reaction, the dosage ratio of the composite modified silicone oil, fluorinated modifier, triethylamine and tetrahydrofuran is 100 g: 45 mmol: 6 mL: 100 mL. After the reaction, rotate and evaporate under reduced pressure to remove tetrahydrofuran to obtain a fluorinated silicone oil matrix.

[0058] 1.3. Prepare a methanol solution with a mass fraction of 50%. Take the fluorinated silicone oil matrix and the methanol solution and mix them with high speed at 1500 rpm for 5 min, add acetic acid to adjust the pH value to 3.5, stir at 240 rpm at room temperature for 1.2 h, then heat up to 50 °C, apply mechanical stirring at 1000 rpm, and slowly add hydrobromic acid to the mixed solution within 3 min. After dropping, continue to stir and react, and control the addition reaction time of hydrobromic acid to be 13 min. During the reaction, the dosage ratio of the fluorinated silicone oil matrix, methanol solution and hydrobromic acid is 100 g: 170 mL: 2 mL. After the reaction, heat up to 60 °C and rotate and evaporate to remove ethanol, let it stand and cool to separate the liquid, take the organic phase and wash it twice with water, and then take the organic phase and dry it to obtain the anti-fouling modified silicone oil.

[0059] 2) Preparation of modified polyurethane fluff

[0060] 2.1. Take 1.5 parts of antioxidant and 42 parts of dimethylacetamide and mix them by feeding and stir to dissolve, then add 130 parts of anti-fouling modified silicone oil and mix. Heat with electric heating to 80 °C, apply mechanical stirring at 60 rpm. Take 54 parts of 4,4'-diphenylmethane diisocyanate and divide it into two parts according to a mass ratio of 3:1. First add 3 / 4 of the raw materials, add the remaining raw materials after 50 min, and continue to stir and react at a constant temperature, and control the total addition reaction time to be 1.5 h to obtain a prepolymer solution.

[0061] 2.2. Cool the prepolymer solution to 60 °C, increase the stirring speed to 150 rpm, add 32 parts of 1,4-butanediol, and stir and react at a constant temperature for 2.5 h to obtain a spinning solution.

[0062] 2.3. Dry-spin the spinning solution to form filaments, wind up the filament bundle, and use a crusher to cut the filament bundle into short fiber fluff with a length of 0.5 mm to obtain modified polyurethane fluff.

[0063] 3) Prepare artificial plush composite fabric

[0064] 3.1. Apply an adhesive on the surface of the base fabric by roller coating, with a coating amount of 120 g / m 2 , and feed the adhesive-coated base fabric into an electrostatic flocking machine. Control the distance between the substrate plates to be 15 cm, the flocking voltage to be 45 kV, the flocking temperature to be 55 °C, and the implantation time to be 15 s. Implant the modified polyurethane fluff into the adhesive to obtain a blank.

[0065] Step S2: Transfer the blank to an oven, pre-bake it at 100 °C for 15 min, then bake it at 150 °C for 7 min for shaping, and brush the fabric after cooling to obtain the artificial plush composite fabric.

[0066] Comparative example

[0067] This comparative example is a commercially available spandex flocked fabric provided by Shaoxing Junxuan Textile Co., Ltd.

[0068] Take the fabrics provided in Examples 1 - 3 and the comparative example, cut specimens with a diameter of 40 mm, condition the specimens in a standard atmosphere for 24 h, and use a 0.5 mm neutral pen to draw circles with diameters of 10 mm and 20 mm at the center of the specimens, repeating the drawing 3 times each time to make contaminated specimens;

[0069] Take a pure cotton towel cloth, soak it in water and control the water content to be 40 wt% as a scrubbing cloth. Fix the scrubbing cloth and the contaminated specimens on a Martindale abrasion tester, control the pressure between the abrasion tester to be 300 cN, the rotation speed to be 30 rpm, and rotate and scrub for 10 min. Evaluate the decontamination grade with reference to the AATCC130 standard. The specific test results are shown in Table 1:

[0070] Table 1

[0071] Example 1 Example 2 Example 3 Comparative Example Detergency level Level 5 Level 5 Level 5 Level 3

[0072] Note:

[0073] Grade 1: The ink spreads severely after scrubbing and decontamination, and the surface of the specimen is severely contaminated;

[0074] Grade 2: The ink remains basically unchanged after scrubbing and decontamination, and the surface of the specimen is significantly contaminated;

[0075] Grade 3: The ink becomes significantly lighter after scrubbing and decontamination, and the surface of the specimen is slightly contaminated;

[0076] Grade 4: Part of the ink is removed after scrubbing and decontamination, and the surface of the specimen has hidden contamination;

[0077] Level 5: After scrubbing and decontamination, the ink is basically eliminated, and the surface of the specimen has no contamination.

[0078] As can be seen from the data in Table 1, the artificial plush composite fabric prepared by the present invention has good stain resistance and easy scrubbing performance.

[0079] Take the fabrics provided in Examples 1 - 3 and the comparative example, and use the abrasion resistance test to reflect the flocking stability. Sampling is carried out according to the standard of GB / T 21196.4 - 2007. Use a Martindale flat abrasion tester, set the pressure to 9 kPa, and take the bottoming of the specimen part as the end point, and record the number of friction times. The specific test results are shown in Table 2:

[0080] Table 2

[0081] Example 1 Example 2 Example 3 Comparative Example Abrasion resistance times 15973 17395 16262 13814

[0082] As can be seen from the data in Table 2, the artificial plush composite fabric prepared by the present invention has good abrasion resistance.

[0083] Take the fabrics provided in Examples 1 - 3 and the comparative example, make samples according to the standard of FZ / T01054.1 - 1999, condition the samples in a standard atmosphere for 24 h, and use a KES - F fabric style meter to test the surface friction performance of the fabric. The specific test results are shown in Table 3:

[0084] Table 3

[0085] Example 1 Example 2 Example 3 Comparative Example Coefficient of kinetic friction 0.3285 0.3504 0.3169 0.5841

[0086] As can be seen from the data in Table 3, compared with the comparative example, the artificial plush composite fabric prepared by the present invention has a smaller dynamic friction coefficient and a smoother hand feeling.

[0087] In the description of the specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0088] The above content is only an example and explanation of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the specific embodiments described or use similar methods to replace them. As long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An artificial plush composite fabric, comprising a base fabric layer, an adhesive layer and a flannelette layer, characterized in that, The flannelette layer is made of modified polyurethane fluff, and the modified polyurethane fluff comprises the following raw materials by weight: 50-60 parts of 4,4'-diphenylmethane diisocyanate, 110-140 parts of anti-fouling modified silicone oil, 28-36 parts of 1,4-butanediol, 1.3-1.6 parts of antioxidant, and 35-50 parts of dimethylacetamide; The anti-fouling modified silicone oil is prepared by the following method: Step A1: Mix trifluorobutyric acid, thionyl chloride and acetone, heat up to 42-48 °C, and stir and reflux for 1.5-2 h to obtain a fluorinated modifier; Step A2: Mix composite modified silicone oil, triethylamine and tetrahydrofuran, control the temperature in a water bath at 10-20 °C, slowly add the fluorinated modifier with stirring, and control the total addition reaction time to be 3-4 h to obtain a fluorinated silicone oil matrix, wherein the composite modified silicone oil is a silicone oil modified with branched-chain amino groups and terminal methoxy groups; Step A3: Mix the fluorinated silicone oil matrix and methanol solution, add acetic acid to adjust the pH value to 3.5-4.5, stir at room temperature for 1-1.5 h, then heat up to 40-50 °C, stir and slowly drop hydrobromic acid, control the addition reaction time of hydrobromic acid to be 10-15 min, and then add ammonia water for neutralization to obtain the anti-fouling modified silicone oil.

2. The artificial plush composite fabric according to claim 1, wherein The dosage ratio of trifluorobutyric acid, thionyl chloride and acetone is 0.1 mol: 0.12-0.14 mol: 40-50 mL.

3. The artificial plush composite fabric according to claim 2, characterized in that, The dosage ratio of composite modified silicone oil, fluorinated modifier, triethylamine and tetrahydrofuran is 100 g: 45 mmol: 5-7 mL: 80-100 mL.

4. The artificial plush composite fabric according to claim 3, wherein, The dosage ratio of fluorinated silicone oil matrix, methanol solution and hydrobromic acid is 100 g: 150-200 mL: 2-3 mL, the mass fraction of the methanol solution is 40-60%, and the mass fraction of hydrobromic acid is 33%.

5. The artificial plush composite fabric according to claim 4, characterized in that, The modified polyurethane fluff is prepared by the following method: Step B1: Dissolve the antioxidant in dimethylacetamide, add the anti-fouling modified silicone oil and mix, heat up to 75-85 °C, stir and intermittently add 4,4'-diphenylmethane diisocyanate, and control the total addition reaction time to be 1.2-1.7 h to obtain a prepolymer solution; Step B2: Cool the prepolymer solution to 55-65 °C, stir and add 1,4-butanediol, and control the reaction time to be 2-2.5 h to obtain a spinning solution; Step B3: Perform dry spinning on the spinning solution, wind up and crush the tow to obtain modified polyurethane fluff.

6. The artificial plush composite fabric according to claim 5, wherein The crushing length of the modified polyurethane fluff is 0.5 mm.

7. The artificial plush composite fabric according to claim 5, characterized in that, The antioxidant is antioxidant Chinox30N.

8. The preparation method of an artificial plush composite fabric according to claim 6, characterized in that, Specifically, it includes the following steps: Step S1: Roll-coat the adhesive on the surface of the base fabric, send it into an electrostatic flocking machine, control the distance between the base plates to be 15 cm, the flocking voltage to be 45 kV, the flocking temperature to be 55 °C, and the implanting time to be 15 s, and implant the modified polyurethane fluff into the adhesive to obtain a blank; Step S2: Transfer the blank to an oven, pre-bake at 100 °C for 12-16 min first, then bake at 150 °C for 5-7 min for shaping, and brush the hair after cooling to obtain an artificial plush composite fabric.