Preparation method of low-load warp-weft high-elongation automobile interior microfiber material

Abstract

The application discloses a preparation method of low-load warp-weft high-elongation automobile interior microfiber material, and belongs to the technical field of microfiber leather preparation. The method comprises the following steps: spinning island-in-sea fibers with PA6 as island components, LDPE as sea components and in combination with spinning master batches; manufacturing non-woven fabric containing LDPE-200 type reinforced cloth; heat setting the non-woven fabric; immersing the non-woven fabric in flame-retardant polyurethane slurry and then water-bath curing; peeling off the sea components and the reinforced cloth by using toluene; and finally performing continuous rubbing, drying and other finishing steps. Through optimization of spinning, non-woven fabric, wet process, weight reduction and finishing process, the application solves the problems of poor elasticity and low warp-weft elongation of conventional microfiber leather, so that the tensile load is less than or equal to 15N when the warp-weft elongation of the product reaches 10%, and the product meets the demand of automobile interior.

Description

Technical Field

[0001] This invention relates to the field of microfiber leather preparation technology, specifically to a method for preparing a low-load, high-elongation microfiber material for automotive interior trim. Background Technology

[0002] With the continuous upgrading and expansion of microfiber leather, it has now been widely replaced by genuine leather in automotive interiors. To achieve better steering wheel wrapping, the tensile load should be ≤15N when the warp and weft elongation reaches 10%.

[0003] Conventional microfiber leather has poor elasticity and low elongation in both warp and weft directions. In particular, the warp elongation cannot meet the customer's requirement of an elongation of 10% and a tensile load of ≤15N. Because microfiber leather has many processing steps and the warp is stretched more, the warp elongation decreases significantly in the finished product. However, the weft is stretched less during production, so the weft elongation of the finished product is significantly higher than that of the warp. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for preparing low-load, high-elongation-rate automotive interior microfiber materials, specifically achieved through the following technical solution:

[0005] A method for preparing a low-load, high-elongation microfiber material for automotive interior trim includes the following steps:

[0006] Step 1, spinning of island-island fibers: PA6 is used as the island component and LDPE as the sea component, and spinning masterbatch is added to produce island-island fibers. The amount of spinning masterbatch added is 0.5-8% of the total mass of PA6, LDPE and spinning masterbatch.

[0007] Step 2, Nonwoven Fabric Production: Select the island fiber obtained in Step 1, and process it through opening, carding, web laying, pre-punching with a pre-punching machine and needle punching with a needle punching machine to produce nonwoven fabric; when laying the web, place a reinforcing fabric with a monofilament diameter of 0.2-0.4mm and a mesh size of 20×20.

[0008] Step 3, heat setting: The nonwoven fabric obtained in step 2 is heat set.

[0009] Step 4: Impregnation with flame-retardant polyurethane slurry. The heat-set nonwoven fabric is impregnated with flame-retardant polyurethane slurry and then placed in an aqueous solution of dimethylformamide for water bath curing to obtain synthetic leather semi-finished product.

[0010] Step 5, reduction: The synthetic leather semi-finished product obtained in step 4 is subjected to a toluene stripping process to extract the marine components from the island fiber, resulting in microfiber synthetic leather.

[0011] Step 6, finishing: The microfiber synthetic leather base fabric obtained in step 5 is fed into a continuous folding machine and dried at a temperature of 80-140℃ to obtain a low-load, high-elongation flame-retardant microfiber leather base fabric.

[0012] The reinforcing fabric is made of LDPE-200 low-density polyethylene mesh.

[0013] The reinforcing fabric is located between two layers of nonwoven fabric formed by laying nets, and then the upper and lower layers of nonwoven fabric are needle-punched and entangled.

[0014] The main process parameters for manufacturing the nonwoven fabric are as follows: pre-punching density is 70-600 needles / m2, needle punching density is 800-3000 needles / m2, number of web layers is 10-30, web width is 3400-4400mm, average weight is 350-850g / m2, and machine speed is 1.5-3.0m / min; the apparent density of the nonwoven fabric is 0.2-0.35g / cm3.

[0015] The flame-retardant polyurethane slurry uses polyether-type polyurethane as a base material. Then, 1%-15% by weight of solvent-based wet-process color paste, 15-40% by weight of phosphorus-nitrogen flame retardant, and 40-90% by weight of dimethylformamide are added to the base material to form a mixed slurry with a solid content of 28-40%. 0.5-3% by weight of nonionic surfactant and 0.5-2% by weight of organosilicon surfactant are added to the above slurry and stirred evenly to obtain the final product.

[0016] The specific operation of the water bath curing is as follows: the non-woven fabric impregnated with flame-retardant polyurethane slurry is immersed in a DMF aqueous solution with a concentration of 15-40%, and water bath curing is carried out for 28-40 minutes at a temperature of 15-25℃, followed by water washing.

[0017] The specific operation for reducing the amount is as follows: immerse the synthetic leather semi-finished product in toluene at a temperature of 85-95℃ for 30-40 minutes, and then wash the synthetic leather semi-finished product with hot water to remove the residual toluene.

[0018] Step 6 further includes the following steps: after the low-load, high-elongation flame-retardant microfiber leather base fabric is brushed, it is immersed in a softener aqueous solution with a concentration of 5-30%, and then sent to a continuous rubbing machine for drying at 80-140℃. After the rubbing and drying treatment, it is sent to a drying and spreading machine for fixed-width drying at 80-100℃.

[0019] The apparent density of the heat-set nonwoven fabric is ≥0.25 g / cm3.

[0020] The technical solution of this invention has the following advantages:

[0021] 1. Spinning process. The island-sea fiber composition is PA6 / LDPE with irregular islands. The PA6 / LDPE ratio is verified, the spinning speed and draft ratio are adjusted, and the fiber breaking elongation is improved to meet the performance requirement of ≥120%.

[0022] 2. Nonwoven Fabric Process. Needle-punched nonwoven fabric is used, with a reinforced composite web laying process. The reinforcing fabric is LDPE-200 low-density polyethylene mesh, with a monofilament diameter of 0.2-0.4mm and a mesh size of 20×20. The needle-punching process of the nonwoven fabric is adjusted to achieve the designed apparent density and physical properties.

[0023] 3. Wet Process. Develop high-solids, high-resilience wet-process resins, verify the addition ratio of cell regulators, and adjust the cell structure and uniformity to ensure both the resin's softness and resilience while preventing the loss of flame retardants during the reduction process. This ensures the product's feel, elasticity, and flame-retardant properties.

[0024] 4. Weight Reduction Extraction. Adjusting the toluene replenishment, machine speed, and rolling pressure, the reinforced low-density polyethylene mesh is dissolved after the LDPE in the island fiber has been fully dissolved. During the previous nonwoven fabric, heat setting, and wet impregnation processes, the presence of the reinforcing fabric effectively reduces tension. The weight reduction extraction process dissolves and removes the reinforcing fabric, improving the elasticity of the finished product and providing some resistance to production tension in the early stages of weight reduction.

[0025] 5. Post-processing and drying. Abandoning the traditional wide-width drying process, a continuous drum drying process is adopted to fully shrink the base in the warp and weft directions, further improving the elasticity and elongation in the warp and weft directions. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] This invention provides a method for preparing a low-load, high-elongation microfiber material for automotive interior trim, specifically prepared by the following method:

[0029] Step 1, spinning of island fibers.

[0030] Using PA6 as the island component and LDPE as the sea component, and combined with spinning masterbatch, island-island fibers with or without fixed islands can be spun. The mass ratio of PA6 to LDPE is 45:55-60:40, and the amount of spinning masterbatch added is 0.5-8% of the total mass of PA6, LDPE and spinning masterbatch. The main process parameters for spinning island-island fibers are: spinning temperature 180-280℃, draw ratio 7-12%, and fiber fineness 5-15 denier.

[0031] Step 2, Nonwoven Fabrication.

[0032] Nonwoven fabrics are made by selecting the above-mentioned non-island-island fibers or fixed-island-island fibers, and then processing them through opening, carding, web laying, pre-punching with a pre-punching machine and needle punching with a needle punching machine.

[0033] The main process parameters for manufacturing nonwoven fabrics are: pre-punch density of 70-600 needles / m. 2 The needle density is 800-3000 needles / m² 2 The number of mesh layers is 10-30, the mesh width is 3400-4400mm, and the average weight is 350-850 g / m². 2 Vehicle speed: 1.5-3.0 m / min; apparent density of nonwoven fabric: 0.2-0.35 g / cm³ 3 .

[0034] The mesh is laid using a reinforced composite process. The reinforcing fabric is LDPE-200 low-density polyethylene mesh with a single filament diameter of 0.2-0.4mm and a mesh size of 20×20.

[0035] The web laying process employs two sets of carding machines and two sets of web laying machines, with polyethylene reinforcing fabric positioned between the two layers of web-laid nonwoven fabric. Then, the upper and lower layers of nonwoven fabric are needle-punched and entangled to prepare the nonwoven fabric (non-woven fabric) greige used in subsequent processes.

[0036] Step 3, heat setting.

[0037] The prepared nonwoven fabric is heat-set at a temperature of 110℃-160℃; the apparent density of the nonwoven fabric after heat setting is ≥0.25g / cm3.

[0038] Step 4: Impregnation with flame-retardant polyurethane slurry.

[0039] Polyurethane slurry, combined with phosphorus and nitrogen flame retardants, color pastes, and nonionic additives, is used to impregnate heat-set nonwoven fabric to ensure thorough impregnation. The fabric is then placed in an aqueous solution of dimethylformamide for water bath curing to obtain a semi-finished synthetic leather product.

[0040] Using one or more polyether-type polyurethanes as the base material, a solvent-based wet-process color paste (1%-15% by weight of the base material), a phosphorus-nitrogen flame retardant (15-40% by weight of the base material), and dimethylformamide (40-90% by weight of the base material) are added to the base material to prepare a mixed slurry with a solid content of 28-40%. Then, 0.5-3% by weight of a nonionic surfactant and 0.5-2% by weight of an organosilicon surfactant are added to the above slurry, and the mixture is stirred evenly to obtain a flame-retardant polyurethane slurry.

[0041] The impregnated nonwoven fabric is immersed in a 15-40% DMF aqueous solution and coagulated in a water bath at a temperature of 15-25℃ for 28-40 minutes to allow the polyurethane to solidify and form cells, and then washed with water.

[0042] Step 5, reduce the amount.

[0043] The synthetic leather semi-finished product obtained in step 4 is processed by using a toluene stripping process to extract the marine components from the island fibers, thus producing microfiber synthetic leather. The synthetic leather semi-finished product is then immersed in toluene at a temperature of 85-95℃ for 30-40 minutes to strip out the marine components. The synthetic leather semi-finished product is then washed with hot water to remove residual toluene.

[0044] Step 6, final tidying.

[0045] The microfiber synthetic leather base fabric obtained in step 5 is fed into a continuous folding machine and dried at a temperature of 80-140℃ to obtain a low-load, high-elongation flame-retardant microfiber leather base fabric.

[0046] The obtained base fabric, after being brushed, is immersed in a softener aqueous solution with a concentration of 5-30%, and then sent back to a continuous tumbling machine for drying at 105-140℃. The tumbling and drying treatment allows the warp and weft directions to shrink fully. After that, it is passed through a drying and spreading machine for fixed-width drying at 80-100℃ to obtain a low-load, high-elongation microfiber leather base product.

[0047] The present invention will be further described below through specific embodiments.

[0048] Example 1

[0049] Step 1, spinning of island fibers.

[0050] Island-island fibers were spun using PA6 as the island component and LDPE as the sea component, along with spinning masterbatch. The mass ratio of PA6 to LDPE was 45:55, and the amount of spinning masterbatch added was 0.5% of the total mass of PA6, LDPE, and spinning masterbatch. The main process parameters for spinning the island-island fibers were: spinning temperature 180℃, draw ratio 10%, and fiber fineness 5 denier.

[0051] Step 2, Nonwoven Fabrication.

[0052] Nonwoven fabrics are produced by selecting the aforementioned island-type fibers, which undergo opening, carding, web laying, pre-punching with a pre-punching machine, and needle punching with a needle punching machine. The main process parameters for nonwoven fabric production are: pre-punching density of 70 needles / m², needle punching density of 800 needles / m², 10 web layers, web width of 3400mm, average weight of 350g / m², and machine speed of 1.5m / min; the apparent density of the nonwoven fabric is 0.2g / cm³. Web laying employs a reinforced composite process, using LDPE-200 low-density polyethylene mesh with a monofilament diameter of 0.2mm and a mesh size of 20×20. Web laying utilizes two sets of carding machines and two sets of web laying machines, with the polyethylene reinforcing fabric positioned between the two web layers. The upper and lower layers of nonwoven fabric are then needle-punched and entangled to prepare the nonwoven fabric greige for subsequent processes.

[0053] Step 3, heat setting.

[0054] The prepared nonwoven fabric was heat-set at a temperature of 110℃; the apparent density of the nonwoven fabric after heat setting was 0.25 g / cm³.

[0055] Step 4: Impregnation with flame-retardant polyurethane slurry.

[0056] A synthetic leather semi-finished product is prepared by impregnating heat-set nonwoven fabric with a polyurethane slurry, a phosphorus-nitrogen flame retardant, a colorant, and a nonionic additive. The impregnated fabric is then immersed in an aqueous solution of dimethylformamide (DMF) for water bath curing. Alternatively, a polyether-type polyurethane is used as the base material. 1% by weight of solvent-based wet-process colorant, 15% by weight of phosphorus-nitrogen flame retardant, and 50% by weight of dimethylformamide are added to the base material to prepare a mixed slurry with a solid content of 30%. 0.5% by weight of nonionic surfactant and 0.5% by weight of silicone surfactant are added to the mixed slurry, and the mixture is stirred until homogeneous to obtain a flame-retardant polyurethane slurry. The impregnated nonwoven fabric is then immersed in a 15% DMF aqueous solution and water bath curing is performed at 15°C for 40 minutes to solidify the polyurethane and form cells. The fabric is then washed with water.

[0057] Step 5, reduce the amount.

[0058] The synthetic leather semi-finished product obtained in step 4 is subjected to a toluene stripping process to extract the marine components from the island fibers, thereby obtaining microfiber synthetic leather. The synthetic leather semi-finished product is then immersed in toluene at a temperature of 85°C for 30 minutes to remove the marine components. The synthetic leather semi-finished product is then washed with hot water to remove residual toluene.

[0059] Step 6, final tidying.

[0060] The microfiber synthetic leather base fabric obtained in step 5 is fed into a continuous folding machine and dried at 80°C to obtain a low-load, high-elongation flame-retardant microfiber leather base fabric. After brushing, the obtained base fabric is immersed in a 5% softener aqueous solution and fed back into the continuous folding machine for drying and folding at 110°C to fully shrink the warp and weft directions. Then, it is passed through a drying and spreading machine for fixed-width drying at 80°C to obtain a low-load, high-elongation microfiber leather base product.

[0061] Table 1. Product Testing Results of Example 1

[0062]

[0063] Example 2

[0064] Step 1, spinning of island fibers.

[0065] Island-island fibers were spun using PA6 as the island component and LDPE as the sea component, along with spinning masterbatch. The mass ratio of PA6 to LDPE was 60:40, and the amount of spinning masterbatch added was 5% of the total mass of PA6, LDPE, and spinning masterbatch. The main process parameters for spinning the island-island fibers were: spinning temperature 280℃, draw ratio 12%, and fiber fineness 6 denier.

[0066] Step 2, Nonwoven Fabrication.

[0067] The aforementioned island-island fibers are selected and processed through opening, carding, web laying, pre-punching with a pre-punching machine, and needle punching to produce nonwoven fabric. The main process parameters for nonwoven fabric production are: pre-punching density of 600 needles / m², needle punching density of 3000 needles / m², 30 web layers, web width of 4400mm, average weight of 850g / m², and machine speed of 2.2m / min; the apparent density of the nonwoven fabric is 0.35g / cm³. Web laying employs a reinforced composite process, using LDPE-200 low-density polyethylene mesh with a monofilament diameter of 0.4mm and a mesh size of 20×20. Web laying utilizes two sets of carding machines and two sets of web laying machines, with the polyethylene reinforcing fabric positioned between the two web layers of nonwoven fabric. The upper and lower layers of nonwoven fabric are then needle-punched and entangled to prepare the nonwoven fabric greige for subsequent processes.

[0068] Step 3, heat setting.

[0069] The prepared nonwoven fabric was heat-set at a temperature of 160℃; the apparent density of the nonwoven fabric after heat setting was 0.30 g / cm³ (≥0.22 g / cm³, meeting the requirements).

[0070] Step 4: Impregnation with flame-retardant polyurethane slurry.

[0071] A synthetic leather semi-finished product is prepared by impregnating heat-set nonwoven fabric with a polyurethane slurry, a phosphorus-nitrogen flame retardant, a colorant, and a nonionic additive. The impregnated fabric is then immersed in an aqueous solution of dimethylformamide (DMF) for water bath curing. Alternatively, two polyether-type polyurethanes are used as base materials. 15% by weight of solvent-based wet-process colorant, 40% by weight of phosphorus-nitrogen flame retardant, and 40% by weight of dimethylformamide are added to the base materials to prepare a mixed slurry with a solid content of 40%. 3% by weight of nonionic surfactant and 2% by weight of silicone surfactant are added to the mixed slurry, and the mixture is stirred until homogeneous to obtain a flame-retardant polyurethane slurry. The impregnated nonwoven fabric is then immersed in a 40% DMF aqueous solution and water bath curing is performed at 25°C for 35 minutes to solidify the polyurethane and form cells. The fabric is then washed with water.

[0072] Step 5, reduce the amount.

[0073] The synthetic leather semi-finished product obtained in step 4 is subjected to a toluene stripping process to extract the marine components from the island fibers, thereby obtaining microfiber synthetic leather. The synthetic leather semi-finished product is then immersed in toluene at a temperature of 95°C for 40 minutes to remove the marine components. The synthetic leather semi-finished product is then washed with hot water to remove residual toluene.

[0074] Step 6, final tidying.

[0075] The microfiber synthetic leather base fabric obtained in step 5 is fed into a continuous folding machine and dried at 140°C to obtain a low-load, high-elongation flame-retardant microfiber leather base fabric. After brushing, the obtained base fabric is immersed in a 30% softener aqueous solution and fed back into the continuous folding machine for drying and folding at 140°C to fully shrink the warp and weft directions. Then, it is passed through a drying and spreading machine for fixed-width drying at 100°C to obtain a low-load, high-elongation microfiber leather base product.

[0076] Table 2. Product Testing Results of Example 2

[0077]

[0078] Example 3

[0079] Step 1, spinning of island fibers.

[0080] Island-sea fiber is spun using PA6 as the island component and LDPE as the sea component, combined with spinning masterbatch. The mass ratio of PA6 to LDPE is 55:45, and the amount of spinning masterbatch added is 8% of the total mass of PA6, LDPE and spinning masterbatch. The main process parameters for spinning island-sea fiber are: spinning temperature 220℃, draw ratio 7%, and fiber fineness 9 denier.

[0081] Step 2, Nonwoven Fabrication.

[0082] The aforementioned island-type fibers are selected and processed through opening, carding, web laying, pre-punching with a pre-punching machine, and needle punching to produce nonwoven fabric. The main process parameters for nonwoven fabric production are: pre-punching density of 350 needles / m², needle punching density of 1300 needles / m², 20 web layers, web width of 3600mm, average weight of 550g / m², and machine speed of 3.0m / min; the apparent density of the nonwoven fabric is 0.27g / cm³. Web laying employs a reinforced composite process, using LDPE-200 low-density polyethylene mesh with a monofilament diameter of 0.3mm and a mesh size of 20×20. Web laying utilizes two sets of carding machines and two sets of web laying machines. The polyethylene reinforcing fabric is positioned between the two layers of web-laid nonwoven fabric. Then, the upper and lower layers of nonwoven fabric are needle-punched and entangled to prepare the nonwoven fabric greige for subsequent processes.

[0083] Step 3, heat setting.

[0084] The prepared nonwoven fabric was heat-set at a temperature of 135℃; the apparent density of the nonwoven fabric after heat setting was 0.26 g / cm³ (≥0.22 g / cm³, meeting the requirements).

[0085] Step 4: Impregnation with flame-retardant polyurethane slurry.

[0086] A synthetic leather semi-finished product is prepared by impregnating heat-set nonwoven fabric with a polyurethane slurry, a phosphorus-nitrogen flame retardant, a colorant, and a nonionic additive. The impregnated fabric is then immersed in an aqueous solution of dimethylformamide (DMF) for water bath curing. Alternatively, a polyether-type polyurethane is used as the base material. 6% by weight of solvent-based wet-process colorant, 25% by weight of phosphorus-nitrogen flame retardant, and 90% by weight of dimethylformamide are added to the base material to prepare a mixed slurry with a solid content of 28%. 1.2% by weight of nonionic surfactant and 1.2% by weight of silicone surfactant are added to the mixed slurry, and the mixture is stirred until homogeneous to obtain a flame-retardant polyurethane slurry. The impregnated nonwoven fabric is then immersed in this DMF aqueous solution and water bath curing is performed at 18°C ​​for 28 minutes to solidify the polyurethane and form cells. The fabric is then washed with water.

[0087] Step 5, reduce the amount.

[0088] The synthetic leather semi-finished product obtained in step 4 is subjected to a toluene stripping process to extract the marine components from the island fibers, thereby obtaining microfiber synthetic leather. The synthetic leather semi-finished product is then immersed in toluene at a temperature of 90°C for 35 minutes to remove the marine components. The synthetic leather semi-finished product is then washed with hot water to remove residual toluene.

[0089] Step 6, final tidying.

[0090] The microfiber synthetic leather base fabric obtained in step 5 is fed into a continuous folding machine and dried at 105°C to obtain a low-load, high-elongation flame-retardant microfiber leather base fabric. After brushing, the obtained base fabric is immersed in an 18% softener aqueous solution and fed back into the continuous folding machine for drying and folding at 105°C to fully shrink the warp and weft directions. Then, it is passed through a drying and spreading machine for fixed-width drying at 88°C to obtain a low-load, high-elongation microfiber leather base product.

[0091] Table 3. Product Testing Results of Example 3

[0092]

[0093] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing a low-load, high-elongation microfiber material for automotive interior trim, characterized in that, Includes the following steps: Step 1, spinning of island-island fibers: PA6 is used as the island component and LDPE as the sea component, and spinning masterbatch is added to produce island-island fibers. The amount of spinning masterbatch added is 0.5-8% of the total mass of PA6, LDPE and spinning masterbatch. Step 2, Nonwoven Fabric Production: Select the island fiber obtained in Step 1, and process it through opening, carding, web laying, pre-punching with a pre-punching machine and needle punching with a needle punching machine to produce nonwoven fabric; when laying the web, place a reinforcing fabric with a monofilament diameter of 0.2-0.4mm and a mesh size of 20×20. Step 3, heat setting: The nonwoven fabric obtained in step 2 is heat set. Step 4: Impregnation with flame-retardant polyurethane slurry. The heat-set nonwoven fabric is impregnated with flame-retardant polyurethane slurry and then placed in an aqueous solution of dimethylformamide for water bath curing to obtain synthetic leather semi-finished product. Step 5, reduction: The synthetic leather semi-finished product obtained in step 4 is subjected to a toluene stripping process to extract the marine components from the island fiber, resulting in microfiber synthetic leather. Step 6, finishing: The microfiber synthetic leather base fabric obtained in step 5 is fed into a continuous folding machine and dried at a temperature of 80-140℃ to obtain a low-load, high-elongation flame-retardant microfiber leather base fabric. The reinforcing fabric is made of LDPE-200 low-density polyethylene mesh. The reinforcing fabric is located between two layers of nonwoven fabric formed by laying nets, and then the upper and lower layers of nonwoven fabric are needle-punched and entangled. The flame-retardant polyurethane slurry uses polyether-type polyurethane as a base material. Then, 1%-15% by weight of solvent-based wet-process color paste, 15-40% by weight of phosphorus-nitrogen flame retardant, and 40-90% by weight of dimethylformamide are added to the base material to form a mixed slurry with a solid content of 28-40%. 0.5-3% by weight of nonionic surfactant and 0.5-2% by weight of organosilicon surfactant are added to the above slurry and stirred evenly to obtain the final product.

2. The method for preparing low-load, high-elongation automotive interior microfiber material according to claim 1, characterized in that, The main process parameters for manufacturing the nonwoven fabric are: pre-punching density of 70-600 needles / m. 2 The needle density is 800-3000 needles / m² 2 The mesh has 10-30 layers, a width of 3400-4400mm, and an average weight of 350-850g / m². 2 Vehicle speed: 1.5-3.0 m / min; apparent density of nonwoven fabric: 0.2-0.35 g / cm³ 3 .

3. The method for preparing low-load, high-elongation automotive interior microfiber material according to claim 1, characterized in that, The specific operation of the water bath curing is as follows: the non-woven fabric impregnated with flame-retardant polyurethane slurry is immersed in a DMF aqueous solution with a concentration of 15-40%, and water bath curing is carried out for 28-40 minutes at a temperature of 15-25℃, followed by water washing.

4. The method for preparing low-load, high-elongation automotive interior microfiber material according to claim 1, characterized in that, The specific operation for reducing the amount is as follows: immerse the synthetic leather semi-finished product in toluene at a temperature of 85-95℃ for 30-40 minutes, and then wash the synthetic leather semi-finished product with hot water to remove the residual toluene.

5. The method for preparing low-load, high-elongation automotive interior microfiber material according to claim 1, characterized in that, Step 6 further includes the following steps: after the low-load, high-elongation flame-retardant microfiber leather base fabric is brushed, it is immersed in a softener aqueous solution with a concentration of 5-30%, and then sent to a continuous rubbing machine for drying at 80-140℃. After the rubbing and drying treatment, it is sent to a drying and spreading machine for fixed-width drying at 80-100℃.

6. The method for preparing low-load, high-elongation automotive interior microfiber material according to claim 1, characterized in that, The apparent density of the heat-set nonwoven fabric is ≥0.25 g / cm³. 3 .

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