Preparation method of colored suede leather base cloth

Abstract

The invention discloses a preparation method of colored suede leather base cloth, which comprises the following steps of: blending, melting and spinning by taking PA (Polyamide) slices as island phases and PE (Polyethylene) slices as sea phases to obtain sea-island fibers, needling to form non-woven fabrics, and shaping at high temperature to obtain the base cloth; preparing colored slurry containing a bridging agent and a curing agent, performing dry coating on release paper to form a coating, then laminating the coating with the shaped base cloth, and separating the release paper after drying to obtain composite coating base cloth with a colored surface layer; carrying out wet-process impregnation on the back surface of the composite coating base cloth by adopting impregnation slurry without adding color paste to form a double-layer structure; and splitting, drying, dyeing, buffing, oiling and fixing to obtain the colored suede leather base cloth. According to the preparation method of the colored suede leather base cloth provided by the invention, a product with bright color and high color fastness is prepared by optimizing a production process.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather manufacturing, and in particular to a method for preparing a colored suede leather base cloth. Background Art

[0002] With the continuous development of social economy, people's demand for leather products is increasing, while the output of natural leather is limited and cannot meet the growing market demand. Therefore, synthetic leather, as a substitute, has gradually become popular. However, as consumers' requirements for product quality and design continue to increase, the synthetic leather industry is also facing greater challenges. Among synthetic leather products, suede leather is loved by consumers for its unique touch and appearance. However, most of the suede dyed products on the market are darker or dull in color, which is difficult to meet consumers' demand for colorful and uniquely designed products. Producing suede leather products with bright colors and high color fastness has become a technical challenge. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology, and to provide a method for preparing a colored suede leather base fabric, so as to prepare a product with bright colors and high color fastness by optimizing the production process.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The first technical scheme relates to a method for preparing a colored suede base fabric, wherein sea-island fibers are prepared by melt spinning with PA slices as the island phase and PE slices as the sea phase, the fibers are formed into a non-woven fabric by needle punching, and then formed into a base fabric by high-temperature setting; a colored slurry including a bridging agent and a curing agent is prepared, and a coating is formed by dry-scraping on a release paper, which is then laminated with the formed base fabric, and the release paper is separated after drying to obtain a composite coated base fabric with a colored surface layer; the back of the composite coated base fabric is wet-impregnated with an impregnation slurry without adding color paste to form a double-layer structure; and a colored suede base fabric is obtained after fiber opening, drying, dyeing, grinding, oiling and color fixing treatment.

[0006] The second technical solution is based on the first technical solution, wherein the fiber opening adopts toluene reduction; in dry coating, the color slurry also includes color paste and resin, the color paste is toluene-resistant color paste, and the resin is toluene-resistant resin.

[0007] The third technical solution is based on the second technical solution, wherein, by mass, the colored slurry includes 100 parts of polyurethane resin, 30 parts to 40 parts of dimethylformamide (DMF), 15 parts to 20 parts of talc, 1.5 parts to 2.5 parts of pore regulator, 3 parts to 5 parts of color paste, 1 part to 2 parts of water, 2 parts to 3 parts of bridging agent and 3 parts to 5 parts of curing agent.

[0008] The fourth technical solution is based on the third technical solution, wherein the preparation process of the colored slurry is: adding the colored slurry into a reactor for stirring, the stirrer speed is 1300-2300 rpm, the time is 40 minutes-60 minutes, and a polyether polyurethane coating slurry with a viscosity range of 1000cP-3000cP is obtained.

[0009] The fifth technical solution is based on the fourth technical solution, wherein release paper is used as a medium for dry scraping, the coating is set to a single layer, and the coating gap during scraping is set to 100 to 120 lines.

[0010] The sixth technical solution is based on the fifth technical solution, wherein the wet impregnation slurry contains 100 parts of polyether polyurethane, 20 parts to 30 parts of light calcium powder, 0.5 parts to 1.5 parts of cell regulator, and 180 parts to 200 parts of DMF.

[0011] The seventh technical solution is based on the sixth technical solution, wherein the preparation process of the wet impregnation slurry includes: adding the wet impregnation slurry to a reactor for stirring, the stirrer speed is 1300-2300 rpm, the time is 40 minutes-60 minutes, and a polyether polyurethane impregnation slurry with a viscosity range of 1000cP-3000cP is obtained.

[0012] The eighth technical solution is based on the first technical solution, wherein in the composition of the sea island fibers, the proportions of PA slices and PE slices are 50% to 55% and 45% to 50% respectively.

[0013] The ninth technical solution is based on the eighth technical solution, wherein the needle density during the acupuncture process is 100C / cm2-400C / cm2.

[0014] The tenth technical solution is based on the ninth technical solution, wherein high temperature setting is performed by gradient heating in a 5-stage oven, the temperature is set in the range of 80°C-140°C, the production speed is controlled at 6.0 m / min-8.0 m / min, and the non-woven fabric after heat setting is cooled by a cooling roller at 8°C-18°C; the weight of the base fabric obtained by high temperature setting is 380 g / m 2 -420g / m 2 .

[0015] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0016] In the first technical solution and related embodiments, before the wet impregnation step, the preparation method first applies a layer of solvent-resistant color slurry containing a bridging agent and a curing agent on the release paper to form a stable and firm color surface layer, and then bonds it to the treated base fabric. This step not only simplifies the process flow of subsequent wet impregnation, but also effectively improves the efficiency of wet impregnation and reduces slurry waste. At the same time, by adding a bridging agent and a curing agent to the color surface layer, a stable chemical bond is formed. The presence of these chemical bonds enhances the bonding strength between the base fabric and the color surface layer, and also improves the chemical resistance and solvent resistance of the composite structure. In the subsequent wet impregnation process, the color surface layer can always maintain its integrity and is not easily damaged or faded. In addition, the preparation method uses an impregnation slurry without adding color paste for wet impregnation, so there is no need to clean the machine and change the material for each color during wet impregnation, so it can simultaneously process multiple colored suede base fabrics of different colors, which not only further improves production efficiency, but also reduces material loss. By adopting this preparation method, the colored slurry can be closely combined with the base fabric, and then the slurry without adding color slurry is subjected to wet impregnation, fiber opening, dyeing and finishing processes. The final product can improve the common problems of fiber color grabbing, resin not coloring and inconsistent coloring of resin and fiber in conventional methods. At the same time, it also reduces the "white hair" phenomenon that is easy to appear on the surface of the product after dyeing by conventional methods.

[0017] In the second technical solution and related embodiments, the color slurry uses a toluene-resistant color slurry to ensure that the color surface layer will not be damaged during the fiber opening process, thereby improving the color fastness and stability of the product. If an ordinary, toluene-intolerant color slurry is used, the dye component in the color slurry may precipitate due to the effect of toluene, which will not only destroy the color uniformity and color fastness of the colored suede leather base fabric, but may also affect the final finished product effect and product quality. By using a toluene-resistant color slurry, this problem can be effectively prevented from occurring, ensuring that the colored suede leather base fabric maintains good color performance and stability during subsequent processing. By combining the toluene-resistant color slurry with the toluene-resistant resin in the slurry, the problem of poor color fastness in the post-finishing dyeing method is also solved to a certain extent.

[0018] In the third technical solution and related embodiments, by adding a bridging agent and a curing agent to the color slurry, the comprehensive performance of the color suede base fabric is improved, including the corrosion resistance, adhesion, stability, chemical resistance and solvent resistance of the color surface layer. The cross-linked structure formed by the bridging agent and the polyurethane resin forms a film after drying, which not only improves the corrosion resistance of the color surface layer, but also improves the adhesion between the polyurethane and the base fabric. Polyurethane itself is a high molecular polymer, and the bridging agent reacts with the active groups in the polyurethane molecules to form an interconnected network structure and a stable chemical bond. This chemical bond also increases the chemical stability of the material, making it more resistant to erosion by the external environment. The use of a curing agent further enhances the chemical resistance and solvent resistance of the polyurethane material. By promoting the formation of a strong chemical bond between polyurethane molecules, the curing agent improves the overall stability and durability of the material. The curing agent not only has good bonding ability, but also improves the bonding strength between the polyurethane slurry and the base fabric after drying, ensuring a strong connection between the color surface layer and the base fabric.

[0019] In the fourth technical solution and related embodiments, the preparation process of the dry-coating slurry ensures the stability and performance of the coating slurry, providing a reliable guarantee for the subsequent formation of the coating.

[0020] In the fifth technical solution and related embodiments, appropriate coating gap settings are used to ensure that the coating is uniform and of moderate thickness, thereby obtaining a high-quality colored surface layer.

[0021] In the sixth technical solution and related embodiments, in the preparation process of the wet impregnation slurry, the number of DMF is 180-200 parts. Compared with the conventional process, the number of DMF is increased and the proportion of resin in the wet impregnation formula is reduced. The resin accounts for about 30.1%-33.2% of the entire wet impregnation formula. By increasing the number of DMF and reducing the proportion of resin, the problem of resin not coloring is improved.

[0022] In the seventh technical solution and related embodiments, the slurry used for wet impregnation does not contain color paste components. This improvement improves production efficiency and effectively reduces material waste. In contrast, when the traditional suede production process uses colored wet impregnation materials, the machine needs to be cleaned and replaced with new slurry after each color is processed. Especially when carrying out small batch trial orders, this operation of cleaning the machine and changing materials is more frequent, resulting in a large amount of remaining color residues that are difficult to handle. Because these residues are mixed with color pastes of different colors, it is difficult to reuse them, which means that the machine needs to be cleaned and the materials need to be changed every time the color is changed, which increases costs and waste.

[0023] In the eighth technical solution and related embodiments, by controlling the ratio of the island phase and the sea phase, the structure and performance of the sea-island fiber can be optimized, and the leather feel of the final colored suede base fabric can be improved.

[0024] In the ninth technical solution and related embodiments, the needle punching density ensures the structural stability and performance of the non-woven fabric.

[0025] In the tenth technical solution and related embodiments, a high-temperature shaping process is used to shape the thickness and weight of the non-woven fabric, thereby completing the production of the base fabric. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] In the claims and description of the present invention, unless explicitly defined otherwise, the terms "first", "second" or "third" etc. are used to distinguish different objects rather than to describe a specific order.

[0028] In the claims and specification of the present invention, unless otherwise expressly defined, directional words, such as the use of terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0029] In the claims, specification and text of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0030] In the claims and description of the present invention, when the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0031] The embodiment of the present invention provides a method for preparing a colored suede base fabric, wherein sea-island fibers are prepared by melt spinning with PA slices as an island phase and PE slices as a sea phase, the fibers are formed into a non-woven fabric by needle punching, and then formed into a base fabric by high-temperature shaping; a colored slurry including a bridging agent and a curing agent is prepared, and a coating is formed by dry-scraping on a release paper, which is then laminated with the shaped base fabric, and the release paper is separated after drying to obtain a composite coated base fabric with a colored surface layer; the back of the composite coated base fabric is wet-impregnated with an impregnation slurry without adding color paste to form a double-layer structure; and the colored suede base fabric is obtained by fiber opening, drying, dyeing, grinding, oiling and color fixing.

[0032] The method comprises the following steps:

[0033] 1. Preparation of sea-island fibers and formation of base fabric:

[0034] With PA slices as the island phase and PE slices as the sea phase, sea-island fibers were prepared by blending and melt spinning.

[0035] The sea-island fiber is needle-punched to form a nonwoven fabric, and the needle density is controlled at 100C / cm during the needle-punching process. 2 Up to 400C / cm 2 range to ensure the structural stability and performance of the nonwoven fabric.

[0036] The non-woven fabric is subjected to high temperature shaping to obtain the base fabric, and its gram weight is controlled at 380g / m 2 Up to 420g / m 2 within the range.

[0037] 2. Preparation of composite coating base fabric:

[0038] Prepare a color paste including a bridging agent and a curing agent, which includes polyurethane resin, dimethylformamide (DMF), talcum powder, cell regulator, color paste, water, bridging agent, curing agent and other ingredients. At this time, the color paste needs to be toluene-resistant, and the polyurethane resin needs to be toluene-resistant to ensure that the color surface layer will not be damaged in the subsequent fiber opening process.

[0039] The coating is formed by dry scraping on the release paper. The coating is set to a single layer. The coating gap is set to 100 to 120 lines during scraping to ensure that the coating is uniform and the thickness is moderate.

[0040] The coating is laminated to the shaped base fabric, and the release paper is separated after drying to obtain a composite coating base fabric with a colored surface layer.

[0041] 3. Wet impregnation treatment:

[0042] The back of the composite coating base fabric is wet impregnated with an impregnation slurry without adding color paste to form a double-layer structure. The wet impregnation slurry contains components such as polyether polyurethane, light calcium powder, pore regulator and dimethylformamide (DMF).

[0043] By adjusting the proportion of DMF and resin, the problem of resin not coloring can be improved.

[0044] 4. Subsequent processing:

[0045] The base fabric after wet impregnation is subjected to fiber opening treatment, and the fiber opening process is toluene reduction.

[0046] The colorful suede leather base fabric is produced through drying, dyeing, grinding, oiling and color fixing treatments.

[0047] Specifically, in step 1, the composition of the sea island fiber includes 50% to 55% of PA slices and 45% to 50% of PE slices. The non-woven fabric is heated for high-temperature shaping, and the high-temperature shaping is performed by gradient heating in a 5-stage oven, the temperature is set in the range of 80°C-140°C, the production speed is controlled at 6.0 m / min-8.0 m / min, and the non-woven fabric after heat setting is cooled by a cooling roller at 8°C-18°C. In this embodiment, the temperatures of the 5-stage oven are set at 80°C-100°C, 95°C-11°C, 110°C-120°C, 120°C-130°C and 130°C-140°C, respectively.

[0048] In step 2, the color paste includes 100 parts of polyurethane resin, 30-40 parts of dimethylformamide (DMF), 15-20 parts of talc, 1.5-2.5 parts of cell regulator, 3-5 parts of color paste, 1-2 parts of water, 2-3 parts of bridging agent and 3-5 parts of curing agent. In the present embodiment, the polyurethane resin selected is CT60SC resin produced by Shandong Tongtai. The resin belongs to the medium soft type and has good toluene extraction resistance. The color paste is selected from toluene-resistant color paste to ensure that the color surface layer will not be damaged during the fiber opening process, and the color fastness and stability of the product are improved. In the present embodiment, the color paste is selected from Mitsukoshi's series color paste. If ordinary, toluene-intolerant color paste is used, the dye component in the color paste may be precipitated due to the effect of toluene, which will not only destroy the color uniformity and color fastness of the colored suede base fabric, but also may affect the final finished product effect and product quality. By using a toluene-resistant color paste, this problem can be effectively prevented, ensuring that the colored suede base fabric maintains good color performance and stability during subsequent processing. By combining the toluene-resistant color paste with the toluene-resistant resin in the slurry, the problem of poor color fastness in the post-finishing dyeing method is also solved to a certain extent.

[0049] In this embodiment, by adding a bridging agent and a curing agent to the color slurry, the comprehensive performance of the color suede base fabric is improved, including the corrosion resistance, adhesion, stability, chemical resistance and solvent resistance of the color surface layer. The cross-linked structure formed by the bridging agent and the polyurethane resin forms a film after drying, which not only improves the corrosion resistance of the color surface layer, but also improves the adhesion between the polyurethane and the base fabric. Polyurethane itself is a high molecular polymer, and the bridging agent reacts with the active groups in the polyurethane molecules to form a network structure connected to each other and a stable chemical bond. This chemical bond also increases the chemical stability of the material, making it more resistant to erosion by the external environment. The use of a curing agent further enhances the chemical resistance and solvent resistance of the polyurethane material. By promoting the formation of a strong chemical bond between polyurethane molecules, the curing agent improves the overall stability and durability of the material. The curing agent not only has good bonding ability, but also can improve the bonding strength between the polyurethane slurry and the base fabric after drying, ensuring a strong connection between the color surface layer and the base fabric.

[0050] The preparation process of the color slurry is as follows: the color slurry of the above components is added into a reaction kettle for stirring at a stirring speed of 1300-2300 revolutions per minute for 40 minutes to 60 minutes to obtain a polyether polyurethane coating slurry with a viscosity range of 1000 cP-3000 cP.

[0051] After the release paper is attached to the shaped base fabric, it is dried. The drying process is carried out by gradient heating in an 8-stage oven. The temperature is set in the range of 70°C-110°C, and the production speed is controlled at 3.0 m / min-4.0 m / min. In this embodiment, the temperature distribution of the 8-stage oven is set to 70°C-80°C, 80°C-90°C, 80°C-90°C, 80°C-90°C, 80°C-90°C, 90°C-100°C, 90°C-100°C and 100°C-110°C.

[0052] In step 3, the preparation process of the wet impregnation slurry includes: adding 100 parts of polyether polyurethane, 20 parts to 30 parts of light calcium powder, 0.5 parts to 1.5 parts of pore regulator, and 180 parts to 200 parts of DMF into a reactor for stirring, the stirrer speed is 1300 rpm to 2300 rpm, the time is 40 minutes to 60 minutes, and a polyether polyurethane impregnation slurry with a viscosity range of 1000cP-3000cP is obtained.

[0053] The wet impregnation and coagulation process uses two impregnation tanks and is equipped with 12 pressure rollers for impregnation treatment. At the same time, two coagulation tanks are set up, and their sugar content is controlled at 18-22 degrees (T), and the temperature is maintained at 28℃-32℃. In addition, the process also includes 12 washing tanks, and the fabric shuttles between them in a "U"-shaped path for cyclic water washing. During the entire process, the speed is maintained at 4.5 meters to 6.5 meters per minute, and the impregnated base fabric is finally obtained.

[0054] In this embodiment, the slurry used for wet impregnation does not contain color paste components. This improvement improves production efficiency and effectively reduces material waste. In contrast, when the traditional suede production process uses colored wet impregnation materials, the machine needs to be cleaned and replaced with new slurry after each color is processed. Especially when carrying out small batch trial orders, this operation of cleaning the machine and changing materials is more frequent, resulting in a large amount of remaining color residues that are difficult to handle. Because these residues are mixed with color pastes of different colors, they are difficult to reuse, which means that the machine needs to be cleaned and the materials need to be changed every time the color is changed, increasing costs and waste.

[0055] In this embodiment, in the preparation process of the wet impregnation slurry, the number of DMF is 180-200 parts. Compared with the conventional process, the number of DMF is increased and the proportion of resin in the wet impregnation formula is reduced. The resin accounts for about 30.1%-33.2% of the entire wet impregnation formula. By increasing the number of DMF and reducing the proportion of resin, the problem of resin not coloring is improved.

[0056] In step 4, the fiber opening process uses the toluene reduction method, which includes a total of 10 processing tanks. Among them, the first 7 tanks are toluene tanks, and the temperature is set to 85°C; the last 3 tanks (i.e. tanks 8 to 10) are washing tanks, and the temperature is controlled between 99°C and 102°C. During the process, the fabric travels at a speed of 8 to 10 meters per minute, and finally the unfixed island or fixed island microfiber base fabric after fiber opening is obtained.

[0057] The dyeing process uses the Xingkang brand's Anmeilan series of high color fastness acid dyes and uses vat dyeing technology. During the dyeing process, 1%-2% alkali solution is used for washing and color fixing. After dyeing and drying, further grinding, oiling and color fixing are carried out, and finally, a colored suede base fabric with high color fastness is produced.

[0058] In this embodiment, the preparation method of the present application first applies a layer of solvent-resistant color slurry containing a bridging agent and a curing agent on the release paper before the wet impregnation step, so as to form a stable and firm color surface layer, and then mates it with the treated base cloth. This step not only simplifies the process flow of subsequent wet impregnation, but also effectively improves the efficiency of wet impregnation and reduces the waste of slurry. At the same time, by adding a bridging agent and a curing agent to the color surface layer, a stable chemical bond is formed. The presence of these chemical bonds enhances the bonding strength between the base cloth and the color surface layer, and also improves the chemical resistance and solvent resistance of the composite structure. In the subsequent wet impregnation process, the color surface layer can always maintain its integrity and is not easily damaged or faded. In addition, the preparation method uses an impregnation slurry without adding color paste for wet impregnation, so there is no need to clean the machine and change the material for each color during wet impregnation, so it is possible to process multiple colored suede base cloths of different colors at the same time, which not only further improves production efficiency, but also reduces material loss. By adopting this preparation method, the colored slurry can be closely combined with the base fabric, and then the slurry without adding color slurry is subjected to wet impregnation, fiber opening, dyeing and finishing processes. The final product can improve the common problems of fiber color grabbing, resin not coloring and inconsistent coloring of resin and fiber in conventional methods. At the same time, it also reduces the "white hair" phenomenon that is easy to appear on the surface of the product after dyeing by conventional methods.

[0059] The colored suede leather base fabric (experimental group) prepared by the scraping process and the microfiber base fabric (control group) prepared by the conventional process were subjected to the same dyeing and finishing processes, and then the color migration, perspiration fastness, water fastness and rubbing fastness were compared and tested. The test results are shown in Table 1:

[0060] Table 1 Comparison of test results between the experimental group and the control group

[0061]

[0062] The color suede fabric prepared by this scraping process surpasses the conventional microfiber base in terms of color fastness. Whether it is color migration, perspiration fastness, water fastness or rubbing fastness, the experimental group shows higher stability and durability. In addition, this scraping process also makes the fiber color more uniform.

[0063] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. A method for preparing a colored suede base fabric, characterized in that: The sea-island fiber is prepared by melt spinning with PA slices as the island phase and PE slices as the sea phase, and then needle-punched to form a non-woven fabric, which is then shaped at high temperature to form a base fabric; a color slurry including a bridging agent and a curing agent is prepared, and a coating is formed by dry-scraping on a release paper, which is then laminated with the shaped base fabric, and the release paper is separated after drying to obtain a composite coated base fabric with a colored surface layer; the back of the composite coated base fabric is wet-impregnated with an impregnation slurry without adding color paste to form a double-layer structure; After fiber opening, drying, dyeing, leather grinding, oiling and color fixing treatments, the colorful suede base fabric is produced.

2. The method for preparing a colored suede base fabric according to claim 1, characterized in that: The fiber opening adopts toluene reduction; in dry coating, the color slurry also includes color paste and resin, the color paste is selected to be toluene-resistant, and the resin is selected toluene-resistant resin.

3. The method for preparing a colored suede base fabric according to claim 2, characterized in that: In parts by mass, the color slurry includes 100 parts of polyurethane resin, 30 parts to 40 parts of dimethylformamide (DMF), 15 parts to 20 parts of talc, 1.5 parts to 2.5 parts of cell regulator, 3 parts to 5 parts of color paste, 1 part to 2 parts of water, 2 parts to 3 parts of bridging agent and 3 parts to 5 parts of curing agent.

4. The method for preparing a colored suede base fabric according to claim 3, characterized in that: The preparation process of the color slurry is as follows: the color slurry is added into a reaction kettle for stirring, the stirring speed of the stirrer is 1300-2300 rpm, the time is 40-60 minutes, and a polyether polyurethane coating slurry with a viscosity range of 1000cP-3000cP is obtained.

5. The method for preparing a colored suede base fabric according to claim 4, characterized in that: Release paper is used as the medium for dry scraping, the coating is set to a single layer, and the coating gap is set to 100 to 120 lines during scraping.

6. The method for preparing a colored suede base fabric according to claim 5, characterized in that: Calculated by mass, the wet impregnation slurry contains 100 parts of polyether polyurethane, 20 parts to 30 parts of light calcium powder, 0.5 parts to 1.5 parts of cell regulator, and 180 parts to 200 parts of DMF.

7. The method for preparing a colored suede base fabric according to claim 6, characterized in that: The preparation process of the wet impregnation slurry comprises: adding the wet impregnation slurry into a reaction kettle for stirring, the stirring speed of the stirrer is 1300-2300 rpm, the time is 40 minutes-60 minutes, and a polyether polyurethane impregnation slurry with a viscosity range of 1000cP-3000cP is obtained.

8. The method for preparing a colored suede base fabric according to claim 1, characterized in that: In the composition of the sea island fibers, the proportions of PA slices and PE slices are 50% to 55% and 45% to 50% respectively.

9. The method for preparing a colored suede base fabric according to claim 8, characterized in that: The needle density during acupuncture is 100C / cm2-400C / cm2.

10. The method for preparing a colored suede base fabric according to claim 9, characterized in that: High temperature setting is carried out by gradient heating in a 5-stage oven, the temperature is set in the range of 80℃-140℃, the production speed is controlled at 6.0m / min-8.0m / min, and the non-woven fabric after heat setting is cooled by a cooling roller at 8℃-18℃; the weight of the base fabric obtained by high temperature setting is 380g / m 2 -420g / m 2 .

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