A method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather

Abstract

The present invention discloses a method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather. The method comprises preparing a GRS recycled non-woven fabric from recycled GRS fibers, impregnating the non-woven fabric with a water-based bio-based polyurethane working emulsion containing an organic bromide flame-retardant filler, and then drying and opening the non-woven fabric to produce the water-based bio-based recycled flame-retardant microfiber synthetic leather. The water-based bio-based recycled flame-retardant microfiber synthetic leather produced by the present invention is green, economical, and environmentally friendly, and also exhibits excellent mechanical properties, good air permeability, and outstanding flame retardancy.

Description

Technical field

[0001] The present invention relates to the technical field of leather, and in particular to a method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather. [Background Technology]

[0002] With the development of the synthetic leather industry, a wide variety of synthetic leather products have emerged. While people are increasingly fond of synthetic leather products, the demand for synthetic leather products is also increasing. With growing environmental awareness, the use of synthetic leather has become more environmentally friendly. Eco-synthetic leather products that use renewable raw materials instead of traditional raw materials are increasingly popular among consumers. For example, recyclable bio-based synthetic leather is not only environmentally friendly and recyclable, but also comparable in performance to traditional synthetic leather, and even excels in certain specific properties such as solvent resistance and moisture wicking.

[0003] Driven by today's society and environmental policies, the synthetic leather industry is developing towards clean, low-energy production, with a focus on personalization and functionality. Demand for leather for garments, shoes, luggage, furniture, interior decoration, and automotive applications is increasing, demanding functionality while ensuring safety, aesthetics, and individuality. Due to the poor flame retardancy of microfiber synthetic leather, which poses safety risks during use, the development of a low-carbon, environmentally friendly, water-based, bio-based, recycled, flame-retardant microfiber is of great significance.

[0004] In view of this, the inventors of this case conducted in-depth research on the above-mentioned issues, which led to the creation of this case. [Summary of the invention]

[0005] The present invention provides a low-carbon, environmentally friendly, water-based, bio-based recycled flame-retardant microfiber synthetic leather with high flame retardancy and a preparation method thereof.

[0006] The present invention is achieved as follows: a method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather, comprising the following steps:

[0007] Step 1: Use GRS recycled fibers to produce GRS recycled nonwoven fabrics;

[0008] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and weight to produce the base fabric;

[0009] Step 3: Wet-impregnate the base fabric with a water-based bio-based polyurethane working emulsion;

[0010] Step 4: drying and solidifying the wet-impregnated base fabric to obtain an impregnated base fabric;

[0011] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0012] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather.

[0013] Furthermore, in step three, the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: 100 parts of aqueous bio-based polyurethane, 0.3-1.2 parts of polyurethane associative thickener, 10-20 parts of organic bromide flame retardant powder, and 1-5 parts of talc are added to a reactor for stirring, the stirrer speed is 2300-4300 r / min, the time is 40-60 min, and the viscosity is controlled at 2000-4000 cps to obtain an aqueous bio-based polyurethane working emulsion.

[0014] Furthermore, the water-based bio-based polyurethane is a water-based bio-based polyurethane emulsion prepared by an emulsification method using bio-based dimer acid polyester diol, polybutylene adipate, isophorone diisocyanate, and dimethylol propionic acid as raw materials.

[0015] Furthermore, in step 1, the GRS recycled fiber is needle punched to produce GRS recycled non-woven fabric; the GRS recycled non-woven fabric has a gram weight of 600-800g / m 2 In the GRS recycled fiber, the nylon PA chip component accounts for 45%-55%, and the polyethylene PE chip component accounts for 55%-45%.

[0016] Furthermore, in step 1, during the needling process, the needle density is 1750-2250C / cm2.

[0017] Furthermore, in step 2, the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80-90°C, 95-105°C, 115-125°C, 125-135°C, 125-135°C, 125-135°C and 130-140°C, respectively. The production speed is controlled at 6.0-8.5m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 8-18°C to achieve the setting of the thickness and gram weight of the GRS recycled non-woven fabric, thereby completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after setting is 0.33-0.38.

[0018] Furthermore, in step four, the drying and coagulation treatment adopts 7-stage oven gradient heating, and the temperatures are set to 80-90°C, 88-98°C, 100-110°C, 110-120°C, 125-130°C, 130-135°C and 145-150°C respectively; the production speed is controlled at 4.5-6.5m / min to obtain the impregnated base cloth.

[0019] The advantages of the present invention are:

[0020] 1. The water-based bio-based polyurethane working emulsion is prepared by an emulsification method using bio-based dimer acid polyester diol, polybutylene adipate, isophorone diisocyanate (IPDI), and dihydroxymethylpropionic acid (DMPA) as raw materials. The reaction process does not require volatile amine neutralization reaction, which solves the problems of solvent pollution and solvent residue, and also improves the practical value and application range of the product.

[0021] 2. Use sea island fibers as GRS recycled fibers with GRS certification to make GRS recycled non-woven fabrics, which are further made into water-based bio-based recycled flame-retardant microfiber leather products, achieving the goals of environmental protection, pollution-free and recyclable.

[0022] 3. The water-based bio-based polyurethane working emulsion uses organic bromide flame retardant powder, which is dispersed in the slurry through simple mechanical stirring to improve the overall flame retardant effect of the water-based bio-based recycled flame retardant microfiber leather and give the product flame retardant functionality. It can be used in automotive leather, luggage leather, furniture leather, clothing leather and other fields to reduce the risk of fire and improve overall safety. [Specific implementation method]

[0023] The implementation methods of the present invention and all other implementation methods obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0024] A method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather comprises the following steps:

[0025] Step 1: Use GRS recycled fibers to produce GRS recycled nonwoven fabrics;

[0026] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and weight to produce the base fabric;

[0027] Step 3: Wet-impregnate the base fabric with a water-based bio-based polyurethane working emulsion;

[0028] Step 4: drying and solidifying the wet-impregnated base fabric to obtain an impregnated base fabric;

[0029] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0030] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather.

[0031] In step three of the present invention, the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: 100 parts of aqueous bio-based polyurethane, 0.3-1.2 parts of polyurethane associative thickener, 10-20 parts of organic bromide flame retardant powder, and 1-5 parts of talc are added to a reactor for stirring, the stirrer speed is 2300-4300 r / min, the time is 40-60 minutes, and the viscosity is controlled at 2000-4000 cps to obtain an aqueous bio-based polyurethane working emulsion.

[0032] In the present invention, the water-based bio-based polyurethane is a water-based bio-based polyurethane emulsion prepared by an emulsification method using bio-based dimer acid polyester diol, polybutylene adipate, isophorone diisocyanate (IPDI), and dimethylol propionic acid (DMPA) as raw materials.

[0033] In the present invention, the organic bromide flame retardant powder is the YS-B09S series halogen-free, environmentally friendly flame retardant for polyurethane, produced by Nantong Yasi Flame Retardant Technology Co., Ltd. The YS-B09S series halogen-free, environmentally friendly flame retardant for polyurethane is a new, highly efficient, and environmentally friendly halogen-free flame retardant with excellent thermal and chemical stability, good compatibility, and is non-toxic, odorless, environmentally friendly, and provides excellent and stable flame retardancy.

[0034] In the present invention, the polyurethane associative thickener is the polyurethane associative thickener HEUR-01 produced by Hefei Anke Fine Chemical Co., Ltd. The polyurethane associative thickener HEUR-01 is a colorless or light yellow transparent body with a solid content of 40±2%, and is used to adjust viscosity and leveling properties.

[0035] In step 1 of the present invention, GRS recycled fibers are needle punched to produce GRS recycled nonwoven fabrics; the GRS recycled nonwoven fabrics have a gram weight of 600-800 g / m 2 The GRS recycled fiber consists of 45%-55% nylon PA chips and 55%-45% polyethylene PE chips. This fiber ratio creates fine folds in synthetic leather, improving peelability.

[0036] First, nylon PA chips and polyethylene PE chips are mixed and GRS recycled fibers are produced through a spinning process; then the GRS recycled fibers are needle-punched to produce GRS recycled non-woven fabrics.

[0037] In step 1, the GRS recycled nonwoven fabric preferably has a gram weight of 660-720 g / m 2 .

[0038] In step 1, during the needling process, the needle density is 1750-2250C / cm 2 , preferably 1850-2050C / cm 2 .

[0039] In step 2, the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80-90°C, 95-105°C, 115-125°C, 125-135°C, 125-135°C, 125-135°C and 130-140°C respectively. The production speed is controlled at 6.0-8.5m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 8-18°C to achieve the setting of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after setting is 0.33-0.38.

[0040] In step 4, the drying and coagulation treatment adopts 7-stage oven gradient heating, and the temperatures are set to 80-90℃, 88-98℃, 100-110℃, 110-120℃, 125-130℃, 130-135℃ and 145-150℃ respectively; the production speed is controlled at 4.5-6.5m / min to obtain the impregnated base cloth.

[0041] In step 6, the base fabric after fiber opening is dried and oiled at a temperature of 145°C in the entire temperature range. The production speed is controlled at 8m / min.

[0042] A number of experiments were conducted using the method for preparing the water-based bio-based recycled flame-retardant microfiber synthetic leather of the present invention. Several examples and comparative examples are selected below to further illustrate the beneficial effects of the obtained water-based bio-based recycled flame-retardant microfiber synthetic leather.

[0043] Example 1

[0044] Step 1: GRS recycled fiber is needle punched to produce GRS recycled non-woven fabric; GRS recycled non-woven fabric has a gram weight of 720g / m 2 During the needling process, the needle density is 2050C / cm 2 .

[0045] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and gram weight to produce the base fabric; the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80°C, 95°C, 115°C, 125°C, 125°C, 125°C and 130°C respectively. The production speed is controlled at 7.0m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 15°C to achieve the shaping of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after shaping is 0.335-0.359.

[0046] Step three, wet-impregnate the base fabric with an aqueous bio-based polyurethane working emulsion; the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: add 100 parts of aqueous bio-based polyurethane, 0.8 parts of polyurethane associative thickener, 15 parts of organic bromide flame retardant powder, and 3 parts of talcum powder into a reactor and stir. The stirrer speed is 2800 r / min, the time is 60 minutes, and the viscosity is controlled at 2800 cps to obtain an aqueous bio-based polyurethane working emulsion.

[0047] Step 4: Dry and solidify the base fabric after wet impregnation. The drying and solidification treatment adopts 7-level oven gradient heating, and the temperatures are set to 80°C, 88°C, 100°C, 110°C, 125°C, 130°C and 145°C respectively; the production speed is controlled at 5m / min to obtain the impregnated base fabric.

[0048] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0049] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather; during the base fabric drying and oiling process, the temperature is 145°C in the entire temperature range, and the production speed is controlled at 8m / min.

[0050] Example 2

[0051] Step 1: GRS recycled fiber is needle punched to produce GRS recycled non-woven fabric; GRS recycled non-woven fabric has a gram weight of 720g / m 2 During the needling process, the needle density is 2050C / cm 2 .

[0052] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and gram weight to produce the base fabric; the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80°C, 95°C, 115°C, 125°C, 125°C, 125°C and 130°C respectively. The production speed is controlled at 7.0m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 15°C to achieve the shaping of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after shaping is 0.335-0.359.

[0053] Step three, wet-impregnate the base fabric with an aqueous bio-based polyurethane working emulsion; the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: add 100 parts of aqueous bio-based polyurethane, 0.5 parts of polyurethane associative type polyurethane associative thickener, 10 parts of organic bromide flame retardant powder, and 2 parts of talcum powder into the reactor and stir. The stirrer speed is 2800r / min, the time is 60min, and the viscosity is controlled at 2800cps to obtain an aqueous bio-based polyurethane working emulsion.

[0054] Step 4: Dry and solidify the base fabric after wet impregnation. The drying and solidification treatment adopts 7-level oven gradient heating, and the temperatures are set to 80°C, 88°C, 100°C, 110°C, 125°C, 130°C and 145°C respectively; the production speed is controlled at 5m / min to obtain the impregnated base fabric.

[0055] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0056] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather; during the base fabric drying and oiling process, the temperature is 145°C in the entire temperature range, and the production speed is controlled at 8m / min.

[0057] Example 3

[0058] Step 1: GRS recycled fiber is needle punched to produce GRS recycled non-woven fabric; GRS recycled non-woven fabric has a gram weight of 720g / m 2 During the needling process, the needle density is 2050C / cm 2 .

[0059] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and gram weight to produce the base fabric; the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80°C, 95°C, 115°C, 125°C, 125°C, 125°C and 130°C respectively. The production speed is controlled at 7.0m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 15°C to achieve the shaping of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after shaping is 0.335-0.359.

[0060] Step three, wet-impregnate the base fabric with an aqueous bio-based polyurethane working emulsion; the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: add 100 parts of aqueous bio-based polyurethane, 1 part of polyurethane associative thickener, 20 parts of organic bromide flame retardant powder, and 1 part of talcum powder into a reactor and stir. The stirrer speed is 2800 r / min, the time is 60 minutes, and the viscosity is controlled at 2800 cps to obtain an aqueous bio-based polyurethane working emulsion.

[0061] Step 4: Dry and solidify the base fabric after wet impregnation. The drying and solidification treatment adopts 7-level oven gradient heating, and the temperatures are set to 80°C, 88°C, 100°C, 110°C, 125°C, 130°C and 145°C respectively; the production speed is controlled at 5m / min to obtain the impregnated base fabric.

[0062] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0063] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather; during the base fabric drying and oiling process, the temperature is 145°C in the entire temperature range, and the production speed is controlled at 8m / min.

[0064] Example 4

[0065] Step 1: GRS recycled fiber is needle punched to produce GRS recycled non-woven fabric; GRS recycled non-woven fabric has a gram weight of 720g / m 2 During the needling process, the needle density is 2050C / cm 2 .

[0066] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and gram weight to produce the base fabric; the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80°C, 95°C, 115°C, 125°C, 125°C, 125°C and 130°C respectively. The production speed is controlled at 7.0m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 15°C to achieve the shaping of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after shaping is 0.335-0.359.

[0067] Step three, wet-impregnate the base fabric with an aqueous bio-based polyurethane working emulsion; the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: add 100 parts of aqueous bio-based polyurethane, 1.2 parts of polyurethane associative thickener, 15 parts of organic bromide flame retardant powder, and 5 parts of talcum powder into a reactor and stir. The stirrer speed is 2800 r / min, the time is 60 minutes, and the viscosity is controlled at 2800 cps to obtain an aqueous bio-based polyurethane working emulsion.

[0068] Step 4: Dry and solidify the base fabric after wet impregnation. The drying and solidification treatment adopts 7-level oven gradient heating, and the temperatures are set to 80°C, 88°C, 100°C, 110°C, 125°C, 130°C and 145°C respectively; the production speed is controlled at 5m / min to obtain the impregnated base fabric.

[0069] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0070] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather; during the base fabric drying and oiling process, the temperature is 145°C in the entire temperature range, and the production speed is controlled at 8m / min.

[0071] Comparative Example 1

[0072] Step 1: GRS recycled fiber is needle punched to produce GRS recycled non-woven fabric; GRS recycled non-woven fabric has a gram weight of 720g / m 2 During the needling process, the needle density is 2050C / cm 2 .

[0073] Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and gram weight to produce the base fabric; the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80°C, 95°C, 115°C, 125°C, 125°C, 125°C and 130°C respectively. The production speed is controlled at 7.0m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 15°C to achieve the shaping of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric; the density range of the GRS recycled non-woven fabric after shaping is 0.335-0.359.

[0074] Step three, wet-impregnate the base fabric with an aqueous bio-based polyurethane working emulsion; the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: add 100 parts of aqueous bio-based polyurethane, 0.8 parts of polyurethane associative thickener, and 2 parts of talcum powder into the reactor and stir, the stirrer speed is 2800r / min, the time is 60min, and the viscosity is controlled at 2800cps to obtain an aqueous bio-based polyurethane working emulsion.

[0075] Step 4: Dry and solidify the base fabric after wet impregnation. The drying and solidification treatment adopts 7-level oven gradient heating, and the temperatures are set to 80°C, 88°C, 100°C, 110°C, 125°C, 130°C and 145°C respectively; the production speed is controlled at 5m / min to obtain the impregnated base fabric.

[0076] Step 5: Opening the impregnated base fabric to obtain the opened base fabric;

[0077] Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather; during the base fabric drying and oiling process, the temperature is 145°C in the entire temperature range, and the production speed is controlled at 8m / min.

[0078] Comparative tests were conducted on the water-based bio-based recycled flame-retardant microfiber synthetic leathers prepared in Examples 1 to 4 and Comparative Example 1. The following conclusions were drawn:

[0079] Table 1

[0080]

[0081] According to Table 1, the following conclusions can be drawn:

[0082] 1. In the Limited Oxygen Index (LOI) test, the minimum oxygen concentration (LOI) required for combustion of the water-based bio-based recycled flame-retardant microfiber leather prepared in Examples 1 to 4 was 27.4-29.3%, while the minimum oxygen concentration (LOI) required for combustion of the microfiber leather prepared in Comparative Example 1 was 16.7%. This shows that the minimum oxygen concentration (LOI) required for combustion of the water-based bio-based recycled flame-retardant microfiber leather prepared in the present invention is significantly improved.

[0083] 2. In the combustion test, the water-based bio-based recycled flame-retardant microfiber leather prepared in Examples 1 to 4 extinguished itself 6-8 seconds after the fire source was removed, with damage lengths of 0.7-0.8 mm and no dripping, demonstrating high flame retardancy. The microfiber synthetic leather prepared in Comparative Example 1 continued to burn for 20 seconds after the fire source was removed until it was completely consumed.

[0084] The strength tests of the water-based bio-based recycled flame-retardant microfiber synthetic leather prepared by the present invention and ordinary water-based flame-retardant microfiber were conducted, and the following conclusions were drawn:

[0085] Table 2

[0086]

[0087] According to Table 2, the following conclusions can be drawn: the peel strength, tear strength, and air permeability of the water-based bio-based recycled flame-retardant microfiber synthetic leather of the present invention are far superior to those of ordinary water-based flame-retardant microfiber.

[0088] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather, characterized by: The steps include: Step 1: Use GRS recycled fibers to produce GRS recycled non-woven fabrics, wherein the GRS recycled fibers contain 45%-55% nylon PA chips and 45%-55% polyethylene PE chips. Step 2: The GRS recycled non-woven fabric is shaped to adjust its thickness and weight to produce the base fabric; Step 3: Wet-impregnate the base fabric with an aqueous bio-based polyurethane working emulsion; the preparation process of the aqueous bio-based polyurethane working emulsion is as follows: add 100 parts of aqueous bio-based polyurethane, 0.3-1.2 parts of polyurethane associative thickener HEUR-01, 10-20 parts of organic bromide flame retardant powder YS-B09S, and 1-5 parts of talc into a reactor and stir at a stirring speed of 2300-4300 r / min for 40-60 minutes, and control the viscosity at 2000-4000 cps to obtain an aqueous bio-based polyurethane working emulsion; the aqueous bio-based polyurethane is prepared by an emulsification method using bio-based dimer acid polyester diol, polybutylene adipate, isophorone diisocyanate, and dimethylol propionic acid as raw materials; Step 4: drying and solidifying the wet-impregnated base fabric to obtain an impregnated base fabric; Step 5: Opening the impregnated base fabric to obtain the opened base fabric; Step 6: The opened base fabric is dried and oiled, shaped, and kneaded; the kneaded base fabric undergoes a dry veneering process to obtain water-based bio-based recycled flame-retardant microfiber synthetic leather.

2. The method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather according to claim 1, characterized in that: In step one, GRS recycled fibers are needle-punched to produce GRS recycled nonwoven fabrics; the GRS recycled nonwoven fabrics have a grammage of 600-800 g / m².

3. The method for preparing the water-based bio-based recycled flame-retardant microfiber synthetic leather according to claim 2, characterized in that: In step 1, during the needling process, the needle density is 1750-2250C / cm 2 .

4. The method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather according to claim 1, characterized in that: In step 2, the GRS recycled non-woven fabric is gradient heated in a 7-stage oven, and the temperatures are set to 80-90°C, 95-105°C, 115-125°C, 125-135°C, 125-135°C, 125-135°C and 130-140°C, respectively. The production speed is controlled at 6.0-8.5m / min, and the heat-set GRS recycled non-woven fabric is cooled by a cooling roller at 8-18°C to achieve the setting of the thickness and gram weight of the GRS recycled non-woven fabric, completing the production of the base fabric.

5. The method for preparing water-based bio-based recycled flame-retardant microfiber synthetic leather according to claim 1, characterized in that: In step 4, the drying and coagulation treatment adopts 7-level oven gradient heating, and the temperatures are set to 80-90°C, 88-98°C, 100-110°C, 110-120°C, 125-130°C, 130-135°C and 145-150°C respectively; the production speed is controlled at 4.5-6.5m / min to obtain the impregnated base cloth.

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