Anti-wrinkle folding-resistant microfiber base cloth and preparation method thereof

Abstract

The invention belongs to the technical field of microfiber base cloth preparation, and relates to an anti-wrinkle folding-resistant microfiber base cloth and a preparation method thereof, and the anti-wrinkle folding-resistant microfiber base cloth is composed of a sea-island fiber non-woven fabric with heterogeneous chemical fiber net density and solvent type polyurethane filled in the sea-island fiber non-woven fabric; the density of the heterogeneous chemical fiber net is divided into three fiber net areas with different densities along the thickness direction of the sea island fiber non-woven fabric, wherein the density of the fiber net in the second area is greater than the density of the fiber net in the first area and the density of the fiber net in the third area; during preparation, the sea-island fiber non-woven fabric is controlled to form a temperature difference inside and outside when passing through a multi-temperature-zone drying oven to an ironing compression roller, the temperature of the inner layer is higher than that of the outer layer, the sea-island fiber non-woven fabric is subjected to thermal shrinkage setting, and the sea-island fiber non-woven fabric with the heterogeneous chemical fiber net density is obtained and then is impregnated with a polyurethane solution through a wet method, and the fabric is obtained. And sequentially carrying out solidification foaming, water washing, toluene decrement and drying to obtain the product. The preparation method is simple; and the prepared product has more excellent wrinkle resistance and folding resistance.

Description

Technical Field

[0001] This invention belongs to the field of microfiber base fabric preparation technology, and relates to a wrinkle-resistant and fold-resistant microfiber base fabric and its preparation method. Background Technology

[0002] Microfiber synthetic leather is a new type of high-end artificial leather made of extremely fine fibers. It can be used in various fields such as shoes, bags, and furniture. However, after being bent or damaged by external forces, its surface will have obvious creases or wrinkles. The overall structure of the base fabric is loose, and when the external force is removed, it cannot completely return to the initial state of the simulated leather, thus affecting the appearance of the product.

[0003] Microfiber synthetic leather generally consists of a microfiber base fabric, an adhesive layer, and a PU surface layer. The microfiber base fabric is the matrix of the microfiber synthetic leather, and its wrinkle resistance significantly affects the overall wrinkle resistance of the leather. The microfiber base fabric is composed of island-sea fiber nonwoven fabric and polyurethane filling the spaces between them.

[0004] Patent CN101338016A relates to a high-resilience wet-process polyurethane resin for microfiber synthetic leather, mainly composed of polyether or polyester polyol, chain extender, and diisocyanate; its molar ratio is: polyester polyol 1, chain extender 1.5~3, isocyanate 2.5~4. It uses a base fabric impregnated with the high-resilience polyurethane resin, which, after reduced fiber opening, widening, drying, oiling, and rubbing, exhibits good resilience, a strong leather-like feel, and fine folds. However, improving the folding resistance of microfiber base fabric by modifying the resin often requires adding customized polyurethane slurry production lines, increasing costs, and does not significantly improve the mechanical properties of the base fabric, nor can it improve the wrinkling problem caused by fiber loosening due to external force damage to the base fabric.

[0005] Therefore, it is of great significance to study a wrinkle-resistant and fold-resistant microfiber base fabric and its preparation method in order to solve the problems existing in the prior art. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and to provide a wrinkle-resistant and fold-resistant microfiber base fabric and its preparation method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A wrinkle-resistant and fold-resistant microfiber base fabric is composed of island fiber nonwoven fabric with heterogeneous chemical fiber web density and polyurethane filling the space between them;

[0009] Heterogeneous fiber web density refers to the division of the nonwoven fabric along the thickness of the coastal island fiber into three fiber web regions with different densities, denoted as Zone 1, Zone 2, and Zone 3 respectively. Zone 1 and Zone 3 are located near the outer side of the island fiber nonwoven fabric, while Zone 2 is located between Zone 1 and Zone 3. The fibers at the interfaces of each zone web interlock to form a single nonwoven fabric. The density of Zone 2 is greater than that of Zone 1 and Zone 3.

[0010] The density of island-type fiber nonwoven fabric with heterogeneous fiber web density is 0.26~0.32 g / cm³. 3 If the density is too low, the fibers will be loosely arranged, resulting in poor mechanical properties of the nonwoven fabric. If the density is too high, the resin will not be able to penetrate into the nonwoven fabric during PU impregnation and will only accumulate on the surface fibers. The internal fibers will not be coated with resin, or the resin will not be able to fully coat the internal fibers. When external force is applied, the fibers will be directly subjected to force and break or slip in a non-replicative manner, resulting in poor wrinkle resistance of microfiber base fabric and leather.

[0011] The polyurethane is a solvent-based polyurethane.

[0012] As a preferred technical solution:

[0013] As described above, the density difference between the second-zone fiber web and the first-zone fiber web in the wrinkle-resistant and fold-resistant microfiber base fabric is 0.04~0.09 g / cm³. 3 The density difference between the second-zone fiber web and the third-zone fiber web is 0.04~0.09 g / cm³. 3 For example, the density of zone 1 / zone 3 fiber web is 0.25~0.29 g / cm³. 3 The density of the fiber web in zone two is 0.29~0.34 g / cm³. 3 When the microfiber base fabric is bent by external force, the surface layer deforms more, while the middle layer deforms less. Based on this, the present invention designs the mass ratio of fiber and polyurethane to take into account the different stress characteristics of the internal and external layers. If the density difference of the fiber web is too small, the improvement effect will not be obvious.

[0014] Web density = web weight / volume. The density of each zone of the web can be calculated by separating each zone after the nonwoven fabric is prepared, weighing and measuring each zone separately. Nonwoven fabrics with heterogeneous web densities have a density of 0.26~0.32 g / cm³. 3 The density of the nonwoven fabric is the sum of the fiber web density of each zone multiplied by the fiber web thickness ratio of each zone.

[0015] As described above, the thickness ratio of the fiber web in Zone 1 (H1 / (H1+H2+H3)) is 20-35%, the thickness ratio of the fiber web in Zone 2 (H2 / (H1+H2+H3)) is 30-60%, and the thickness ratio of the fiber web in Zone 3 (H3 / (H1+H2+H3)) is 20-35%.

[0016] The thickness ratio of Zone 1 / Zone 3 fiber web should be controlled between 20% and 35%. If the ratio is too low, the polyurethane content that can be filled will be too low, resulting in a thin PU film, fewer cells, weak recovery ability of the base fabric surface after bending, and easy creases. Conversely, if the thickness of Zone 2 is too low, there will be less internal fiber linkage when the base fabric is subjected to external force, resulting in weak resistance to external force damage and no significant improvement in the strength of the base fabric.

[0017] In the wrinkle-resistant and fold-resistant microfiber base fabric described above, the total mass of polyurethane accounts for 37.5~43.54% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric.

[0018] As described above, the anti-wrinkle and fold-resistant microfiber base fabric has a polyurethane distribution coefficient per unit thickness of 1.06~1.17 in the first and third zone fiber webs and 0.76~0.94 in the second zone fiber web, based on the polyurethane distribution coefficient per unit thickness.

[0019] Polyurethane distribution coefficient per unit thickness = percentage of polyurethane in this area relative to the total polyurethane content of the base fabric / percentage of the thickness in this area relative to the total thickness of the base fabric;

[0020] The thickness of Zone 1 and Zone 3 fiber webs is 20-35% each. Based on the total mass of polyurethane, the polyurethane content in Zone 1 and Zone 3 fiber webs is adjusted to 21.95-38.07 wt%, so that the polyurethane distribution coefficient per unit thickness in Zone 1 and Zone 3 fiber webs is 1.06-1.17. The thickness of Zone 2 fiber web is 30-60%. Based on the total mass of polyurethane, the polyurethane content in Zone 2 fiber web is adjusted to 23.86-56.10 wt%, so that the polyurethane distribution coefficient per unit thickness in Zone 2 fiber webs is 0.76-0.94.

[0021] Within a reasonable range, for the outer layer, the higher the polyurethane content and the larger the polyurethane distribution coefficient per unit thickness, the better the wrinkle resistance; for the middle layer, the higher the fiber web density, the stronger the resistance of the base fabric to external force damage, the better the shape retention of the base fabric, and the better the wrinkle resistance.

[0022] The present invention also provides a method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric as described in any of the preceding claims, comprising the following steps:

[0023] (1) When the island fiber nonwoven fabric passes through the multi-temperature zone oven to the ironing roller, a temperature difference is formed between the inside and outside, and the temperature of the inner layer is higher than that of the outer layer. The island fiber nonwoven fabric is heat-shrinked and shaped to obtain an island fiber nonwoven fabric with a heterogeneous chemical fiber web density. The nonwoven fabric is processed through multiple ovens with different temperatures. It is heated and shrinks freely in the heating zone. After the heating zone, it passes through the cooling zone to cool the surface of the nonwoven fabric. The inner layer temperature of the nonwoven fabric is higher than that of the outer layer. The inner layer temperature is high and the compression of the ironing roller is large, resulting in a high density. The outer layer temperature of the nonwoven fabric is low and the compression of the ironing roller is small, resulting in a low density. The structure of loose outside and tight inside is obtained.

[0024] (2) The island fiber nonwoven fabric with heterogeneous chemical fiber web density is wet-impregnated with polyurethane solution. After the polyurethane solution on the surface is scraped off with a scraper, it is then subjected to coagulation foaming, water washing, toluene reduction and drying in sequence to obtain wrinkle-resistant and fold-resistant microfiber base fabric.

[0025] As a preferred technical solution:

[0026] As described above, in the preparation method of the wrinkle-resistant and fold-resistant microfiber base fabric, the basis weight of the island fiber nonwoven fabric in step (1) is 280~600 g / m². 2 Weight less than 280g / m 2 Nonwoven fabrics have short heat dissipation paths and small internal and external temperature differences, making it less prone to density changes in the thickness direction when passing through pressure rollers; while microfiber leather, especially non-skinned products, generally does not have a weight exceeding 600g / m². 2 Non-woven fabric production results in wasted costs; the sea phase of island fiber is LDPE, the island phase is PA6, and the island ratio is 3:7.

[0027] As described above, in the preparation method of the wrinkle-resistant and fold-resistant microfiber base fabric, step (1) involves a multi-temperature zone oven that sequentially includes a heating zone and a cooling zone. The number of heating and cooling zones is no less than two, and the total number of temperature zones is six to eight. The temperature of the last zone in the heating zone is 125 to 135°C. Sufficient dwell time should be ensured in the heating zone so that when the fabric exits the heating zone, the island-island fiber nonwoven fabric has been adjusted to the temperature of the last zone from the inside out. The temperature of the last zone in the cooling zone is 80 to 100°C. Immediately after exiting the cooling zone... Upon entering the ironing zone, the fabric remains in each cooling zone for 0.5 minutes. The cooling process proceeds from the surface inwards. Due to the short total dwell time in the cooling zones, the temperature of the island-island fiber nonwoven fabric varies from the inside to the outside upon exiting the cooling zone. The fiber web near the surface has already cooled below its softening point temperature, while the fiber web in the middle remains above its softening point temperature. When ironing at this point, the fiber web above its softening point in the interior is significantly compressed, while the fiber web on the outer surfaces undergoes slight compression, thus forming a three-layered fiber web structure with a looser outer layer and a denser inner layer. The thickness ratio of the fiber web is related to the position of the interior reaching its softening point temperature upon exiting the cooling zone.

[0028] The heating zones are sequentially heated from low to high to ensure uniform heating and free shrinkage of the nonwoven fabric. The internal temperature of the nonwoven fabric should not be lower than 125℃ to ensure sufficient heating of the internal fibers so that it can be compressed when passing through the pressure rollers, and should not be higher than 135℃, otherwise the internal fiber temperature will be too high. That is, the temperature of the last heating zone should be in the range of 125~135℃. When the LDPE on the fiber surface melts and passes through the pressure rollers, the internal fibers adhere tightly and accumulate, which prevents the resin from penetrating the tightly accumulated fibers during PU impregnation. The resin only accumulates on the surface layer of the fibers, and the internal fibers are not coated with resin. The last heating zone... Following the heating zone is the transition zone within the cooling zone, whose temperature falls between the last temperature zone of the heating zone and the temperature of the next cooling zone. The ideal temperature for the last cooling zone is 80-100℃. Below 80℃, the internal fibers will cool down more along with the surface layer and cannot be fully compressed, resulting in no significant difference in compression between the internal and external fibers. Above 100℃, the surface fibers will not cool down sufficiently, resulting in no significant difference in compression between the internal and external fibers when passing through the pressure rollers. After treatment in the multi-temperature zone oven, the fabric is then repeatedly squeezed by the ironing rollers to obtain the desired density isomerized nonwoven fabric. The ideal temperature for the ironing rollers is 80-100℃.

[0029] As described above, in the preparation method of the anti-wrinkle and fold-resistant microfiber base fabric, during the wet impregnation in step (2), the polyurethane solution fully impregnates the island fiber nonwoven fabric with the density of the isomeric chemical fiber web, that is, it fills the internal space of the nonwoven fabric. The impregnation adopts the tank impregnation method. During the full impregnation, the nonwoven fabric is completely immersed in the impregnation liquid. It is repeatedly passed through the guide roller and the roller in the tank so that the impregnation liquid completely penetrates the nonwoven fabric. Finally, the impregnation liquid is removed from the surface of the nonwoven fabric by scraping off the excess impregnation liquid with a scraper.

[0030] If solvent-based polyurethane is not fully impregnated, voids will form inside, resulting in wrinkles when folded. If the density of the nonwoven fabric is too low, the polyurethane content will be too high when fully impregnated, making the base fabric feel stiff and have a strong plasticity. If the density of the nonwoven fabric is too high, polyurethane impregnation is difficult, and the polyurethane content is low when fully impregnated, making it difficult for polyurethane to coat each fiber (fiber bundles clump together, making it difficult for polyurethane to impregnate the inside of the fiber bundles). After fiber opening, the fiber bundles are loose, and the polyurethane coating is not tight, making the polyurethane film and fiber bundle shape easily damaged under external force.

[0031] Invention principle:

[0032] When the microfiber base fabric is bent under external force, the surface layer deforms more, while the middle layer deforms less. Compared with conventional base fabrics, the base fabric of this invention has a higher polyurethane distribution in the surface layer (i.e., the polyurethane content in zone one and zone three fiber webs is higher than that in zone two fiber webs under the same thickness conditions), resulting in a thicker film layer after solidification. The solvent-based wet-process polyurethane can provide more compressive and tensile elasticity to resist changes in external force when the base fabric is bent, effectively preventing creases from forming on the surface of the base fabric.

[0033] When bending occurs, the fibers and resin on the inner side of the bend hardly slip, while the fibers and resin on the outer side of the bend slip to absorb the deformation energy of the external force. This invention features a denser fiber distribution in the middle of the nonwoven fabric, more connection points between fibers, and a tighter overall fiber winding. This allows the stress on the outer side to be quickly conducted and absorbed by the fibers winding around the stress points on the inner side. The fibers in zone two conduct stress to the polyurethane resin in zone one or three through the fibers in zone one or three to absorb the stress.

[0034] When the microfiber base fabric is subjected to external force, the fibers slip to absorb the deformation energy of the external force, and the fibers subjected to external force will form linkages with the surrounding fibers (because the fibers in the nonwoven fabric are intertwined), forming mechanical supplements. When subjected to external force damage, the higher internal fiber density can drive more fibers to form linkages and absorb more external force damage energy; when the external force is removed, it will quickly restore itself, making the shape and structure of the base fabric more stable.

[0035] Beneficial effects:

[0036] (1) A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric according to the present invention, by changing the overall structure of the nonwoven fabric fiber, so that the fiber forms a structure with relatively loose side layers and dense middle layer on both sides of the cross section, thereby improving the overall wrinkle-resistant and fold-resistant performance of the base fabric when subjected to external force damage and bending.

[0037] (3) The anti-wrinkle and fold-resistant microfiber base fabric of the present invention has a high density of the middle fiber web and a low density of the fiber web on both sides, which takes into account the contribution of polyurethane resin cell structure and fiber linkage slippage to crease improvement and shape maintenance. Compared with homogeneous nonwoven fabric with high polyurethane content and low fiber web density and homogeneous nonwoven fabric with low polyurethane content and high fiber web density, it has better anti-wrinkle properties. At the same time, the differentiated density distribution of the base fabric has both fleshy feel and drape, and the hand feel is closer to that of genuine leather. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the cross-section of the wrinkle-resistant and fold-resistant microfiber base fabric;

[0039] Figure 2 This is a graph showing the flexural strength evaluation results for Example 1;

[0040] Figure 3 The image shows the flexural strength evaluation results for Comparative Example 1.

[0041] Figure 4 This is a graph showing the flexural endurance evaluation results for Comparative Example 2;

[0042] Among them, 1-zone one fiber web, 2-zone two fiber web, 3-zone three fiber web. Detailed Implementation

[0043] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0044] The test methods involved in the performance indicators in the embodiments and comparative examples of this invention are as follows:

[0045] Bursting strength index: Measured according to the method specified in GB / T 1539-2007 standard. This index is related to the ability of the base fabric to resist external forces. The greater the resistance to external forces, the better the shape retention.

[0046] Creases: Visually inspect the surface after repeatedly folding in one direction 10,000 times. The force applied during each fold is 1 kg, and the application time is 3 seconds.

[0047] Example 1

[0048] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0049] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0050] The basis weight of the island fiber nonwoven fabric is 400 g / m². 2 The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0051] The multi-temperature zone oven includes heating zones and cooling zones. There are 5 heating zones and a total of 7 temperature zones. The temperatures of each zone in the heating zone are 80℃, 100℃, 120℃, 130℃, and 135℃, respectively. The temperatures of each zone in the cooling zone are 125℃ and 90℃, respectively. The pressing roller has a pressure of 0.25MPa and a temperature of 90℃.

[0052] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 6 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0053] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 35℃ and a coagulation time of 13 min. The mass percentage concentration of the dimethylformamide aqueous solution is 40%. The temperature of the water washing tank is 95℃, and the temperature of the toluene tank is 80℃. The drying temperature is 130℃, and the drying time is 15 min.

[0054] like Figure 1 As shown, the final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the division of the island-island fiber nonwoven fabric into three fiber web regions with different densities along its thickness direction, denoted as Zone 1 (web 1), Zone 2 (web 2), and Zone 3 (web 3). Zone 1 and Zone 3 are located near the outer side of the island-island fiber nonwoven fabric, while Zone 2 is located between Zone 1 and Zone 3. The densities of Zone 1, Zone 2, and Zone 3 are 0.25 g / cm³. 3 0.33g / cm 3 0.25g / cm 3 The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.29 g / cm³. 3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.27 mm; the thickness ratio of zone 1 fiber web is 25%, zone 2 fiber web is 50%, and zone 3 fiber web is 25%; the total mass of polyurethane accounts for 40.68% of the total mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in zone 1 fiber web is 29.17 wt%, and the polyurethane content in zone 2 fiber web is 41.66 wt%; the polyurethane distribution coefficient per unit thickness is 1.17 in zone 1 and zone 3 fiber webs, and 0.83 in zone 2 fiber web; the bursting strength index of the wrinkle-resistant and fold-resistant microfiber base fabric is 32 kPa·m. 2 / g, flexural endurance evaluation results are shown in [link to data]. Figure 2 .

[0055] Comparative Example 1

[0056] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric is basically the same as in Example 1, except that the cooling zone is omitted in the multi-temperature zone oven, and the pressure of the ironing roller is 0.15 MPa.

[0057] The final wrinkle-resistant and fold-resistant microfiber base fabric is composed of island-sea fiber nonwoven fabric and polyurethane filling the space between them; the density of zone 1, zone 2, and zone 3 fiber webs is 0.25 g / cm³. 3 The density of the island fiber nonwoven fabric is 0.25 g / cm³. 3The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.45 mm; the total mass of polyurethane accounts for 44.44% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 22 kPa·m. 2 / g, flexural endurance evaluation results are shown in [link to data]. Figure 3 .

[0058] Comparing Comparative Example 1 and Example 1, it can be found that the wrinkle resistance and folding endurance of Comparative Example 1 are worse. This is because the island fiber nonwoven fabric of Comparative Example 1 has a low density, reduced fiber entanglement, less internal linkage when subjected to external force, weak resistance to external force damage, and is prone to overall looseness and wrinkling; the base fabric has a harder feel and a stronger plasticity.

[0059] Comparative Example 2

[0060] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric is basically the same as in Example 1, except that the cooling zone is omitted in the multi-temperature zone oven and the pressure of the ironing roller is 0.23 MPa.

[0061] The final wrinkle-resistant and fold-resistant microfiber base fabric is composed of island-sea fiber nonwoven fabric and polyurethane filling the space between them; the density of zone 1, zone 2, and zone 3 fiber webs is 0.33 g / cm³. 3 The density of the island fiber nonwoven fabric is 0.33 g / cm³. 3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.12 mm; the total mass of polyurethane accounts for 36.36% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 27 kPa·m. 2 / g, flexural endurance evaluation results are shown in [link to data]. Figure 4 .

[0062] Comparing Comparative Example 2 with Example 1, it can be found that the wrinkle resistance and folding endurance of Comparative Example 2 are worse. This is because the density of the island fiber nonwoven fabric in Comparative Example 2 is high and the content of polyurethane that can be filled is too low, resulting in a thin PU film, fewer cell counts, weak recovery ability of the base fabric surface after bending, and easy creases.

[0063] Example 2

[0064] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0065] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0066] The basis weight of the island fiber nonwoven fabric is 380 g / m². 2The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0067] The multi-temperature zone oven includes heating zones and cooling zones. There are 4 heating zones and a total of 6 temperature zones. The temperatures of each zone in the heating zone are 80℃, 110℃, 120℃ and 130℃, respectively, and the temperatures of each zone in the cooling zone are 120℃ and 100℃, respectively. The pressure of the ironing roller is 0.22MPa and the temperature is 95℃.

[0068] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 7 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0069] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 30°C and a coagulation time of 10 minutes. The mass percentage concentration of the dimethylformamide aqueous solution is 30%. The temperature of the washing tank is 96°C, and the temperature of the toluene tank is 85°C. The drying temperature is 120°C, and the drying time is 10 minutes.

[0070] The final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the fact that the thickness direction of the island-island fiber nonwoven fabric is divided into three fiber web regions with different densities, denoted as zone one, zone two, and zone three. Zone one and zone three are located near the outer side of the island-island fiber nonwoven fabric, while zone two is located between zone one and zone three. The densities of zone one, zone two, and zone three are 0.26 g / cm³. 3 0.3g / cm 3 0.26g / cm 3 The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.28 g / cm³. 3The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.2 mm; the thickness of the zone 1 fiber web accounts for 20%, the zone 2 fiber web accounts for 60%, and the zone 3 fiber web accounts for 20%; the total mass of polyurethane accounts for 41.28% of the total mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in the zone 1 and zone 3 fiber webs is 21.95 wt%, and the polyurethane content in the zone 2 fiber web is 56.10 wt%; the polyurethane distribution coefficient per unit thickness is 1.10 in the zone 1 and zone 3 fiber webs, and 0.94 in the zone 2 fiber web; the bursting strength index of the wrinkle-resistant and fold-resistant microfiber base fabric is 29 kPa·m. 2 / g.

[0071] Example 3

[0072] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0073] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0074] The basis weight of the island fiber nonwoven fabric is 500 g / m². 2 The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0075] The multi-temperature zone oven includes heating zones and cooling zones. There are 5 heating zones and a total of 7 temperature zones. The temperatures of each zone in the heating zone are 80℃, 100℃, 120℃, 130℃, and 135℃, respectively. The temperatures of each zone in the cooling zone are 125℃ and 80℃, respectively. The pressing roller has a pressure of 0.28MPa and a temperature of 80℃.

[0076] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 6 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0077] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 40℃ and a coagulation time of 12 min. The mass percentage concentration of the dimethylformamide aqueous solution is 50%. The temperature of the washing tank is 98℃, and the temperature of the toluene tank is 90℃. The drying temperature is 125℃, and the drying time is 18 min.

[0078] The final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the fact that the thickness direction of the island-island fiber nonwoven fabric is divided into three fiber web regions with different densities, denoted as zone one, zone two, and zone three. Zone one and zone three are located near the outer side of the island-island fiber nonwoven fabric, while zone two is located between zone one and zone three. The densities of zone one, zone two, and zone three are 0.27 g / cm³. 3 0.34g / cm 3 0.27g / cm 3 The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.29 g / cm³. 3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.54 mm; the thickness ratio of zone 1 fiber web is 35%, zone 2 fiber web is 30%, and zone 3 fiber web is 35%; the total mass of polyurethane accounts for 40.58% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in zone 1 and zone 3 fiber webs is 38.07 wt%, and the polyurethane content in zone 2 fiber web is 23.86 wt%; the polyurethane distribution coefficient per unit thickness is 1.09 in zone 1 and zone 3 fiber webs, and 0.80 in zone 2 fiber web; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 36 kPa·m. 2 / g.

[0079] Example 4

[0080] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0081] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0082] Among them, the basis weight of the island fiber nonwoven fabric is 600g / m². 2 The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0083] The multi-temperature zone oven includes heating zones and cooling zones. There are 6 heating zones and a total of 8 temperature zones. The temperatures of each zone in the heating zone are 80℃, 100℃, 120℃, 130℃, 135℃, and 135℃, respectively. The temperatures of each zone in the cooling zone are 130℃ and 100℃, respectively. The pressing roller has a pressure of 0.3MPa and a temperature of 100℃.

[0084] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 8 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0085] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 45℃ and a coagulation time of 15 min. The mass percentage concentration of the dimethylformamide aqueous solution is 48%. The temperature of the washing tank is 100℃, and the temperature of the toluene tank is 95℃. The drying temperature is 140℃, and the drying time is 20 min.

[0086] The final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the fact that the thickness direction of the island-island fiber nonwoven fabric is divided into three fiber web regions with different densities, denoted as zone one, zone two, and zone three. Zone one and zone three are located near the outer side of the island-island fiber nonwoven fabric, while zone two is located between zone one and zone three. The densities of zone one, zone two, and zone three are 0.29 g / cm³. 3 0.34g / cm 3 0.29g / cm 3 The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.32 g / cm³. 3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.73 mm; the thickness of the zone 1 fiber web accounts for 20%, the zone 2 fiber web accounts for 60%, and the zone 3 fiber web accounts for 20%; the total mass of polyurethane accounts for 37.50% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in the zone 1 and zone 3 fiber webs is 22.86 wt%, and the polyurethane content in the zone 2 fiber web is 54.28 wt%; the polyurethane distribution coefficient per unit thickness is 1.14 in the zone 1 and zone 3 fiber webs, and 0.90 in the zone 2 fiber web; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 41 kPa·m. 2 / g.

[0087] Example 5

[0088] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0089] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0090] The basis weight of the island fiber nonwoven fabric is 400 g / m². 2 The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0091] The multi-temperature zone oven includes heating zones and cooling zones. There are 5 heating zones and a total of 7 temperature zones. The temperatures of each zone in the heating zone are 80℃, 100℃, 120℃, 130℃, and 130℃, respectively. The temperatures of each zone in the cooling zone are 125℃ and 90℃, respectively. The pressure of the ironing roller is 0.2MPa and the temperature is 90℃.

[0092] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 6 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0093] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 35℃ and a coagulation time of 13 min. The mass percentage concentration of the dimethylformamide aqueous solution is 40%. The temperature of the washing tank is 95℃, and the temperature of the toluene tank is 80℃. The drying temperature is 130℃, and the drying time is 15 min.

[0094] The final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the fact that the thickness direction of the island-island fiber nonwoven fabric is divided into three fiber web regions with different densities, denoted as zone one, zone two, and zone three. Zone one and zone three are located near the outer side of the island-island fiber nonwoven fabric, while zone two is located between zone one and zone three. The densities of zone one, zone two, and zone three are 0.25 g / cm³. 3 0.27g / cm 3 0.25g / cm 3The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.26 g / cm³. 3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.40 mm; the thickness of the zone 1 fiber web accounts for 25%, the zone 2 fiber web accounts for 50%, and the zone 3 fiber web accounts for 25%; the total mass of polyurethane accounts for 43.54% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in the zone 1 and zone 3 fiber webs is 28.67 wt%, and the polyurethane content in the zone 2 fiber web is 42.66 wt%; the polyurethane distribution coefficient per unit thickness is 1.15 in the zone 1 and zone 3 fiber webs, and 0.85 in the zone 2 fiber web; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 24 kPa·m. 2 / g.

[0095] A comparison of Example 5 and Example 1 shows that the density of the three-zone web is related to the final temperature of the heating zone, the temperature of the cooling zone, and the dwell time. This determines the temperature of the web center when ironing; the higher the temperature, the higher the nonwoven fabric density. It is also related to the roller pressure; the higher the pressure, the higher the nonwoven fabric density. By adjusting the above parameters, the web densities of zones one and three can remain unchanged, while the web density of zone two can be reduced.

[0096] Example 6

[0097] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0098] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0099] The basis weight of the island fiber nonwoven fabric is 400 g / m². 2 The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0100] The multi-temperature zone oven includes heating zones and cooling zones. There are 5 heating zones and a total of 7 temperature zones. The temperatures of each zone in the heating zone are 80℃, 100℃, 120℃, 130℃, and 130℃, respectively. The temperatures of each zone in the cooling zone are 115℃ and 50℃, respectively. The pressure of the ironing roller is 0.25MPa and the temperature is 25℃.

[0101] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 6 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0102] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 35℃ and a coagulation time of 13 min. The mass percentage concentration of the dimethylformamide aqueous solution is 40%. The temperature of the water washing tank is 95℃, and the temperature of the toluene tank is 80℃. The drying temperature is 130℃, and the drying time is 15 min.

[0103] The final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the fact that the thickness direction of the island-island fiber nonwoven fabric is divided into three fiber web regions with different densities, denoted as zone one, zone two, and zone three. Zone one and zone three are located near the outer side of the island-island fiber nonwoven fabric, while zone two is located between zone one and zone three. The densities of zone one, zone two, and zone three are 0.25 g / cm³. 3 0.33g / cm 3 0.25g / cm 3 The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.27 g / cm³. 3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.41 mm; the thickness of the zone 1 fiber web accounts for 40%, the zone 2 fiber web accounts for 20%, and the zone 3 fiber web accounts for 40%; the total mass of polyurethane accounts for 43.00% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in the zone 1 and zone 3 fiber webs is 42.42 wt%, and the polyurethane content in the zone 2 fiber web is 15.16 wt%; the polyurethane distribution coefficient per unit thickness is 1.06 in the zone 1 and zone 3 fiber webs, and 0.76 in the zone 2 fiber web; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 25 kPa·m. 2 / g.

[0104] A comparison between Example 6 and Example 1 shows that, under the same residence time in the cooling zone, the area of ​​the fiber web that reaches the softening point temperature can be shifted by reducing the temperature of the cooling zone, thereby reducing the proportion of the fiber web thickness in the second zone.

[0105] Example 7

[0106] A method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric includes the following steps:

[0107] (1) Control the temperature difference between the inside and outside of the island fiber nonwoven fabric when it passes through the multi-temperature zone oven to the ironing roller, and make the temperature of the inner layer higher than that of the outer layer. Heat shrink and shape the island fiber nonwoven fabric to obtain island fiber nonwoven fabric with heterogeneous chemical fiber web density.

[0108] The basis weight of the island fiber nonwoven fabric is 400 g / m². 2 The sea phase of the island fiber is LDPE (manufacturer: LG Group, South Korea, grade: MB9500), and the island phase is PA6 (manufacturer: Henan Shenmapuli Materials Co., Ltd., grade: PA6 / P028), with an island-to-sea ratio of 3:7.

[0109] The multi-temperature zone oven includes heating zones and cooling zones. There are 5 heating zones and a total of 7 temperature zones. The temperatures of each zone in the heating zone are 80℃, 100℃, 120℃, 130℃, and 135℃, respectively. The temperatures of each zone in the cooling zone are 135℃ and 120℃, respectively. The pressing roller has a pressure of 0.25MPa and a temperature of 90℃.

[0110] (2) The island fiber nonwoven fabric with heterogeneous fiber web density is fully impregnated with polyurethane solution (manufacturer: Jiangsu Huafeng Ultrafiber Materials Co., Ltd., brand: JF-W-TL04050, concentration of 30wt%; diluted to 20wt% with solvent DMF), and the surface polyurethane solution is scraped off with a scraper. Then, it is subjected to coagulation foaming, water washing in a water washing tank, toluene reduction in 6 toluene tanks, water washing and drying in sequence to finally obtain wrinkle-resistant and fold-resistant ultrafiber base fabric.

[0111] The coagulation foaming process uses an aqueous solution containing dimethylformamide at a coagulation temperature of 35℃ and a coagulation time of 13 min. The mass percentage concentration of the dimethylformamide aqueous solution is 40%. The temperature of the water washing tank is 95℃, and the temperature of the toluene tank is 80℃. The drying temperature is 130℃, and the drying time is 15 min.

[0112] The final wrinkle-resistant and fold-resistant microfiber base fabric consists of island-island fiber nonwoven fabric with heterogeneous fiber web density and polyurethane filling the space between them. The heterogeneous fiber web density refers to the fact that the thickness direction of the island-island fiber nonwoven fabric is divided into three fiber web regions with different densities, denoted as zone one, zone two, and zone three. Zone one and zone three are located near the outer side of the island-island fiber nonwoven fabric, while zone two is located between zone one and zone three. The densities of zone one, zone two, and zone three are 0.25 g / cm³. 3 0.33g / cm 3 0.25g / cm 3 The density of the island-of-sea fiber nonwoven fabric with heterogeneous fiber web density is 0.31 g / cm³.3 The thickness of the wrinkle-resistant and fold-resistant microfiber base fabric is 1.17 mm; the thickness ratio of zone 1 fiber web is 10%, zone 2 fiber web is 80%, and zone 3 fiber web is 10%; the total mass of polyurethane accounts for 38.16% of the mass of the wrinkle-resistant and fold-resistant microfiber base fabric; based on the total mass of polyurethane, the polyurethane content in zone 1 and zone 3 fiber webs is 12.96 wt%, and the polyurethane content in zone 2 fiber web is 74.08 wt%; the polyurethane distribution coefficient per unit thickness is 1.30 in zone 1 and zone 3 fiber webs, and 0.93 in zone 2 fiber web; the bursting index of the wrinkle-resistant and fold-resistant microfiber base fabric is 27 kPa·m. 2 / g.

[0113] A comparison of Example 7 and Example 1 shows that, under the same residence time in the cooling zone, by increasing the temperature of the cooling zone, the area with less surface area drops below the softening point, causing the fiber web area that reaches the softening point temperature to move outward, thereby increasing the proportion of the fiber web thickness in the second zone.

Claims

1. An anti-wrinkle crease-resistant microfiber base cloth, characterized by: Islands-in-sea fiber nonwoven fabric with isomerization web density and polyurethane filled therebetween; The isomerization web density refers to three web regions with different densities along the thickness direction of the islands-in-sea fiber nonwoven fabric, which are referred to as a first web region, a second web region and a third web region respectively; the first web region and the third web region are close to the outer side of the islands-in-sea fiber nonwoven fabric, and the second web region is located between the first web region and the third web region; the density of the second web region is greater than the densities of the first web region and the third web region. The density of the island-in-sea fiber nonwoven fabric having the isomerized web density is 0.26 to 0.32 g / cm 3 ; The polyurethane is a solvent type polyurethane.

2. The wrinkle-resistant and crease-resistant microfiber base fabric according to claim 1, wherein the polyurethane resin is a polyurethane resin having a glass transition temperature of 20 to 40°C. The difference between the density of the second zone web and the density of the first zone web is 0.04 to 0.09 g / cm 3 The difference between the density of the second zone web and the density of the third zone web is 0.04 to 0.09 g / cm 3 .

3. The wrinkle-resistant and crease-resistant microfiber base fabric according to claim 1, wherein the polyurethane resin is a polyurethane resin having a glass transition temperature of 20 to 40°C. The thickness proportion of the first web region is 20-35%, the thickness proportion of the second web region is 30-60%, and the thickness proportion of the third web region is 20-35%.

4. The wrinkle-resistant, foldable microfiber base fabric according to claim 1, wherein the polyurethane is a thermoplastic polyurethane. The total mass of the polyurethane accounts for 37.5-43.54% of the mass of the wrinkle-resistant and fold-resistant microfiber base cloth.

5. The anti-wrinkle and crease-resistant microfiber base fabric according to claim 4, wherein the polyurethane resin is a polyurethane resin having a glass transition temperature of 20 to 40°C. In terms of the unit thickness polyurethane distribution coefficient, the unit thickness polyurethane distribution coefficient in the first web region and the third web region is 1.06-1.17, and the unit thickness polyurethane distribution coefficient in the second web region is 0.76-0.

94. The unit thickness polyurethane distribution coefficient = the percentage of the polyurethane in the total polyurethane content of the base cloth / the percentage of the thickness of the region in the total thickness of the base cloth; In terms of the total mass of the polyurethane, the content of the polyurethane in the first web region is 21.95-38.07wt%, and the content of the polyurethane in the second web region is 23.86-56.10wt%.

6. The method for preparing an anti-wrinkle and foldable microfiber fabric according to any one of claims 1 to 5, wherein the step of applying the adhesive is performed by using a hot-melt adhesive. The method comprises the following steps: (1) controlling the islands-in-sea fiber nonwoven fabric to form a temperature difference between the inside and the outside when passing through a multi-temperature zone oven to a hot calender roller, and the temperature of the inner layer is higher than that of the outer layer, to heat-shrink and set the islands-in-sea fiber nonwoven fabric, to obtain the islands-in-sea fiber nonwoven fabric with isomerization web density; (2) immersing the islands-in-sea fiber nonwoven fabric with isomerization web density in a polyurethane solution by wet method, scraping off the polyurethane solution on the surface with a scraper, and then sequentially performing coagulation foaming, washing, toluene reduction and drying, to obtain the wrinkle-resistant and fold-resistant microfiber base cloth.

7. The method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric according to claim 6, characterized in that, The basis weight of the sea-island fiber nonwoven fabric in step (1) is 280-600 g / m 2 ; the sea phase of the sea-island fiber is LDPE, the island phase is PA6, and the sea-island ratio is 3:

7.

8. The method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric according to claim 7, characterized in that, In step (1), the multi-temperature zone oven comprises a temperature rising zone and a temperature falling zone in sequence, the number of the temperature rising zone and the temperature falling zone is not less than 2, and the total number of temperature zones is 6-8; the temperature of the last temperature rising zone is 125-135℃, the temperature of the last temperature falling zone is 80-100℃, and the temperature of the hot calender roller is 80-100℃.

9. The method for preparing a wrinkle-resistant and fold-resistant microfiber base fabric according to claim 6, characterized in that, In step (2), when immersing by wet method, the polyurethane solution fully immerses the islands-in-sea fiber nonwoven fabric with isomerization web density.

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