Preparation method of water-based environment-friendly suede microfiber leather

Abstract

The invention is applicable to the technical field of microfiber leather, and provides a preparation method of water-based environment-friendly suede microfiber leather, which comprises the following steps: S1, preparation of water-soluble PVA marine master batch: uniformly mixing a cold water-soluble PVA raw material with dipentaerythritol, an antioxidant and calcium stearate according to a proportion, then carrying out melt extrusion through a single screw, and dicing to obtain the PVA marine master batch; the melting point of the PVA master batch is 160-210 DEG C, and the decomposition temperature is 275-310 DEG C; s2, PET color master batch preparation; S3, water-soluble dyed yarn sea-island fiber preparation and compounding; s4, weaving; s5, predetermining; s6, carrying out impregnation; s7, splitting with water; s8, sanding is conducted; and S9, washing and after-finishing. The water-based splitting process is adopted, so that the energy consumption, the carbon emission and the cost are low; the water-soluble dyed yarn sea-island fabric is subjected to hot water splitting, water does not corrode a PET island, pigment in the island cannot be partially peeled off like alkali splitting, the color change before and after is small, color matching of color master batches is simple, and the development cost and process are greatly reduced for various specific colors of automotive interiors and electronic packaging materials.

Description

Technical Field

[0001] The invention relates to the technical field of microfiber leather, and in particular to a method for preparing water-based environmentally friendly suede microfiber leather. Background Art

[0002] Microfiber leather is actually a kind of leather product. It is coated with PU coating on the basis of the base cloth composed of microfibers. Microfiber leather has many characteristics, such as high tear strength and tensile strength, good folding resistance, good cold resistance, good mildew resistance, etc. The full name of microfiber leather is microfiber reinforced PU leather. It is made of bundled microfibers and polyurethane through a special process. It uses nylon microfibers with similar structure and performance to the bundled collagen fibers in natural leather. It is characterized by high tear strength and tensile strength, good folding resistance, good cold resistance, good mildew resistance, thick and plump finished products, good simulation, low VOC (volatile organic compounds) content, easy to clean surface, and similar organizational structure to natural leather. Microfiber reinforced PU leather is widely used because of these characteristics. It has certain applications in clothing coats, furniture sofas, decorative soft bags, gloves, car seats, photo frames and albums, notebook covers, electronic product protective covers and daily necessities.

[0003] At present, the microfiber leather on the market is mainly oily microfiber and water-based non-woven microfiber leather. The oily microfiber has a better style and feel, but a large amount of DMF and organic solvents are used in production, the production environment is poor, and there are problems such as solvent volatilization during use. DMF is a Class 2A carcinogen. After invading the body, it is mainly metabolized in the liver and excreted quickly. The main target organ is the liver, and the kidneys are also damaged to a certain extent. It is moderately toxic. Moreover, DMF is a non-biodegradable substance and is flammable. When it encounters open flames, high heat or contact with oxidants, it is dangerous to cause combustion and explosion. It is a hazardous waste. With the increasingly stringent environmental protection policies of various countries, the production and export of oily leather are greatly restricted.

[0004] As an environmentally friendly leather product, water-based leather has great economic and environmental value. There is a certain gap between water-based non-woven microfiber and oily microfiber in terms of feel, appearance and physical properties. Water-based microfiber leather is mainly veneer leather. Suede leather is only developed by Toray, Asahi Kasei and a few domestic companies in Japan, and there are more or less certain problems. With the improvement of economy and people's aesthetics, suede microfiber has been applied in many fields such as electronic packaging materials, automotive interiors, clothing, and shoe materials. Water-based environmentally friendly suede microfiber has high profit value. With the attention of various countries to carbon emissions and the outbreak of new energy vehicles, the market prospects of water-based environmentally friendly suede microfiber leather are broad.

[0005] The existing water-based non-woven microfiber leather has the following problems:

[0006] 1. The investment cost of production equipment is high. The non-woven fabric production line is generally around 10 million yuan, and the best is around 80 million yuan;

[0007] 2. The fiber opening process in production mainly uses toluene and liquid alkali to open the fiber. Toluene is flammable and explosive, which poses a great safety hazard; liquid alkali fiber opening has high energy consumption and high carbon emissions;

[0008] 3. The product has low elasticity, poor mechanical properties and poor processing stability;

[0009] 4. Mainly based on microfiber bottom veneer leather, the products are highly homogenized, the market competition is fierce, and the profit is low;

[0010] 5. The developed water-based suede microfiber opening process mainly uses liquid alkali, which has high energy consumption and high carbon emissions;

[0011] 6. The suede microfiber feels hard and the suede feeling is not delicate enough. There are various physical property problems when it is used in high-end fields such as electronic packaging materials and automotive interiors;

[0012] 7. The base fabric is made of non-woven fabric or woven middle layer + non-woven surface layer. The equipment cost is high, which greatly increases the product cost and has low competitiveness in the mid- and high-end markets;

[0013] 8. The product has defects caused by non-woven fabric, and its elasticity and mechanical properties are limited.

[0014] To this end, the present invention provides a method for preparing water-based environmentally friendly suede microfiber leather. Summary of the invention

[0015] The purpose of the present invention is to provide a method for preparing water-based environmentally friendly suede microfiber leather to solve the problems in the above-mentioned background technology.

[0016] To achieve the above object, the present invention provides the following technical solution: a method for preparing water-based environmentally friendly suede microfiber leather, comprising the following steps:

[0017] S1, preparation of water-soluble PVA sea-phase masterbatch:

[0018] The cold water soluble PVA raw material is mixed evenly with dipentaerythritol, antioxidant and calcium stearate in proportion, and then melt-extruded and pelletized by a single screw to obtain the PVA sea phase masterbatch; the melting point of the PVA masterbatch is 160℃-210℃, and the decomposition temperature is 275℃-310℃;

[0019] S2, PET masterbatch preparation:

[0020] Choose the type and amount of pigment according to the application;

[0021] Pigment type selection: For microfibers used in electronic materials, choose halogen-free or low-halogen pigments; for microfibers used in automotive interiors, choose light-resistant and weather-resistant pigments;

[0022] Dosage selection: Pigment: 20-40 parts; PET: 60-80 parts; Other additives: 2-5 parts;

[0023] S3, preparation and compounding of water-soluble dyed yarn sea-island fibers:

[0024] Mix water-soluble PVA sea-phase masterbatch, PET color masterbatch and PET in proportion;

[0025] S4, Weaving:

[0026] Adjust the fabric's float length, density and structure according to product requirements;

[0027] S5, scheduled:

[0028] The required width and density are set by dry heat. The setting temperature is 30-40℃ lower than the melting point of modified PVA. The time should not be too long to prevent PVA from softening.

[0029] S6, impregnation:

[0030] The water-soluble colored yarn sea-island fiber is impregnated in the impregnation liquid at a certain rate;

[0031] S7, water-opened fiber:

[0032] The impregnated and dried fabric passes through a continuous extrusion fiber opening device. In a water tank with 50-70℃ water + osmotic additives, the PVA and cellulose thickeners in the fabric are dissolved, and the roller squeezes out the moisture in the fabric. The PVA and cellulose thickeners in the fabric are completely removed through multiple impregnations.

[0033] S8, Sanded:

[0034] The fabric after opening is sanded;

[0035] S9, washing and finishing:

[0036] The sanded fabric part only needs to be washed and finished to obtain a finished product with a layered color appearance.

[0037] Preferably, the mixing ratio of the PVA raw material to dipentaerythritol, antioxidant and calcium stearate in S1 is 50:5-10:1-1.5:1-3.

[0038] Preferably, the ratio of water-soluble PVA sea-phase masterbatch: PET masterbatch: PET in S3 is 15-30: 1-15: 60-84; the ratio of water-soluble PVA sea-phase masterbatch is adjusted according to the product feel and style requirements, and the ratio of PET masterbatch and PET is adjusted according to the product color and color style.

[0039] Preferably, the composition of the impregnation liquid in S6 is as follows:

[0040] Water: water-based resin: color paste: cross-linking agent: functional additive: thickener = 62-83: 15-20: 0.2-3: 0.5-2: 0.5-2: 0.5-1.

[0041] Preferably, the functional additive is one or more of wetting, penetration, leveling, antibacterial, and pore generation additives.

[0042] Preferably, the thickener is a compound of a cellulose thickener and a PU associative thickener.

[0043] The present invention has at least the following beneficial effects:

[0044] (1) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather, which adopts a water-based fiber opening process, has low energy consumption, low carbon emissions, and low cost;

[0045] (2) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather. The water-soluble colored yarn island fabric is opened by hot water. Water does not corrode the PET islands. The pigments in the islands will not be partially peeled off like alkali opening. The color change before and after is small. The masterbatch is easy to adjust. The development cost and process of various specific color automotive interior and electronic packaging materials are greatly reduced.

[0046] (3) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather, wherein the water-based fiber opening has no corrosion to the PET island and no damage to the strength of the fiber, and has a significant effect on improving the wear resistance and physical properties of the product;

[0047] (4) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather. The water-based fiber opening process does not damage the PU resin, and the PU will not be lost during the fiber opening process, which greatly reduces the PU physical property requirements, dosage and cost;

[0048] (5) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather. After ordinary sea-island fibers are impregnated with PU resin, the internal sea phase is not easily completely opened during fiber opening, and the residual sea phase will affect the feel, style and physical properties of the finished product;

[0049] (6) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather. The water-soluble sea-island fiber adjusts the ratio of the sea phase and the island phase, removes the sea phase through subsequent fiber opening, and forms a cavity and a release structure between the fiber and the PU, which greatly improves the feel, air permeability, elasticity and mechanical properties of the finished product.

[0050] (7) The present invention provides a method for preparing a water-based environmentally friendly suede microfiber leather, which has good color fastness and a layered color appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is the DSC graph of modified PVA slice;

[0052] Figure 2 is the TGA curve;

[0053] Figure 3 The color of the sample before fiber opening;

[0054] Figure 4 This is the color of the sample after fiber opening. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] Example 1

[0057] A method for preparing water-based environmentally friendly suede microfiber leather comprises the following steps:

[0058] S1, preparation of water-soluble PVA sea-phase masterbatch:

[0059] The cold water soluble PVA raw material is uniformly mixed with dipentaerythritol, antioxidant and calcium stearate in a proportion of 50:5:1:1, and then single screw melt extrusion and pelletization are performed to obtain PVA sea phase masterbatch; the melting point of PVA masterbatch is 160°C, and the decomposition temperature is 275°C;

[0060] S2, PET masterbatch preparation:

[0061] Choose the type and amount of pigment according to the application;

[0062] Pigment type selection: For microfibers used in electronic materials, choose halogen-free or low-halogen pigments; for microfibers used in automotive interiors, choose light-resistant and weather-resistant pigments;

[0063] Dosage selection: Pigment: 20 parts; PET: 60 parts; Other additives: 2 parts;

[0064] S3, preparation and compounding of water-soluble dyed yarn sea-island fibers:

[0065] Mix water-soluble PVA marine masterbatch, PET masterbatch and PET in proportion, the ratio of water-soluble PVA marine masterbatch: PET masterbatch: PET = 15:1:60; the ratio of water-soluble PVA marine masterbatch is adjusted according to the product feel and style requirements, and the ratio of PET masterbatch and PET is adjusted according to the product color and color style;

[0066] S4, Weaving:

[0067] According to product requirements, adjust the length, density and organization of the fabric's floating lines; then through subsequent processes such as impregnation, fiber opening and sanding, the water-based suede microfiber leather product will have a fine velvety feel and the woven background will be effectively covered;

[0068] S5, scheduled:

[0069] The required width and density are set by dry heat. The setting temperature is 30℃ lower than the melting point of modified PVA. The time should not be too long to prevent PVA from softening.

[0070] S6, impregnation:

[0071] The water-soluble colored yarn sea-island fiber is impregnated in an impregnation liquid at a certain rate. The composition of the impregnation liquid is as follows:

[0072] Water: water-based resin: color paste: cross-linking agent: functional additive: thickener = 62:15:0.2:0.5:0.5:0.5;

[0073] The functional additive is one or more of wetting, penetration, leveling, antibacterial, and pore generation additives;

[0074] The thickener is a compound of cellulose thickener and PU associative thickener. Cellulose thickener has high thickening efficiency and can be washed away by water; PU associative thickener has good thixotropy, but excessive use will affect the water resistance of the product. The use of thickener can be significantly reduced by compounding the two thickeners;

[0075] S7, water-opened fiber:

[0076] The impregnated and dried fabric passes through a continuous extrusion fiber opening device. In a water tank with 50°C water + osmotic additives, the PVA and cellulose thickeners in the fabric are dissolved, and the roller squeezes out the moisture in the fabric. The PVA and cellulose thickeners in the fabric are completely removed through multiple impregnations.

[0077] S8, Sanded:

[0078] The fabric after opening is sanded;

[0079] S9, washing and finishing:

[0080] The sanded fabric part only needs to be washed and finished to obtain a finished product with a layered color appearance.

[0081] Example 2

[0082] A method for preparing water-based environmentally friendly suede microfiber leather comprises the following steps:

[0083] S1, preparation of water-soluble PVA sea-phase masterbatch:

[0084] The cold water soluble PVA raw material is uniformly mixed with dipentaerythritol, antioxidant and calcium stearate in a proportion of 50:7:1.2:2, and then single screw melt extrusion and pelletization are performed to obtain PVA sea phase masterbatch; the melting point of PVA masterbatch is 180°C, and the decomposition temperature is 300°C;

[0085] S2, PET masterbatch preparation:

[0086] Choose the type and amount of pigment according to the application;

[0087] Pigment type selection: For microfibers used in electronic materials, choose halogen-free or low-halogen pigments; for microfibers used in automotive interiors, choose light-resistant and weather-resistant pigments;

[0088] Dosage selection: Pigment: 30 parts; PET: 70 parts; Other additives: 4 parts;

[0089] S3, preparation and compounding of water-soluble dyed yarn sea-island fibers:

[0090] Mix water-soluble PVA marine masterbatch, PET masterbatch and PET in proportion, the ratio of water-soluble PVA marine masterbatch: PET masterbatch: PET = 20:9:72; the ratio of water-soluble PVA marine masterbatch is adjusted according to the product feel and style requirements, and the ratio of PET masterbatch and PET is adjusted according to the product color and color style;

[0091] S4, Weaving:

[0092] According to product requirements, adjust the length, density and organization of the fabric's floating lines; then through subsequent processes such as impregnation, fiber opening and sanding, the water-based suede microfiber leather product will have a fine velvety feel and the woven background will be effectively covered;

[0093] S5, scheduled:

[0094] The required width and density are set by dry heat. The setting temperature is 35℃ lower than the melting point of modified PVA. The setting time should not be too long to prevent PVA from softening.

[0095] S6, impregnation:

[0096] The water-soluble colored yarn sea-island fiber is impregnated in an impregnation liquid at a certain rate. The composition of the impregnation liquid is as follows:

[0097] Water: water-based resin: color paste: cross-linking agent: functional additive: thickener = 70:17:1.6:1.1:1:0.8;

[0098] The functional additive is one or more of wetting, penetration, leveling, antibacterial, and pore generation additives;

[0099] The thickener is a compound of cellulose thickener and PU associative thickener. Cellulose thickener has high thickening efficiency and can be washed away by water; PU associative thickener has good thixotropy, but excessive use will affect the water resistance of the product. The use of thickener can be significantly reduced by compounding the two thickeners;

[0100] S7, water-opened fiber:

[0101] The impregnated and dried fabric passes through a continuous extrusion fiber opening device. In a water tank with 60°C water + osmotic additives, the PVA and cellulose thickeners in the fabric are dissolved, and the roller squeezes out the moisture in the fabric. The PVA and cellulose thickeners in the fabric are completely removed through multiple impregnations.

[0102] S8, Sanded:

[0103] The fabric after opening is sanded;

[0104] S9, washing and finishing:

[0105] The sanded fabric part only needs to be washed and finished to obtain a finished product with a layered color appearance.

[0106] Example 3

[0107] A method for preparing water-based environmentally friendly suede microfiber leather comprises the following steps:

[0108] S1, preparation of water-soluble PVA sea-phase masterbatch:

[0109] The cold water soluble PVA raw material is uniformly mixed with dipentaerythritol, antioxidant and calcium stearate in a proportion of 50:10:1.5:3, and then single screw melt extrusion and pelletization are performed to obtain PVA sea phase masterbatch; the melting point of PVA masterbatch is 210°C, and the decomposition temperature is 310°C;

[0110] S2, PET masterbatch preparation:

[0111] Choose the type and amount of pigment according to the application;

[0112] Pigment type selection: For microfibers used in electronic materials, choose halogen-free or low-halogen pigments; for microfibers used in automotive interiors, choose light-resistant and weather-resistant pigments;

[0113] Dosage selection: Pigment: 40 parts; PET: 80 parts; Other additives: 5 parts;

[0114] S3, preparation and compounding of water-soluble dyed yarn sea-island fibers:

[0115] Mix water-soluble PVA sea-phase masterbatch, PET masterbatch and PET in proportion, the ratio of water-soluble PVA sea-phase masterbatch: PET masterbatch: PET = 30:15:84; the ratio of water-soluble PVA sea-phase masterbatch is adjusted according to the product feel and style requirements, and the ratio of PET masterbatch and PET is adjusted according to the product color and color style;

[0116] S4, Weaving:

[0117] According to product requirements, adjust the length, density and organization of the fabric's floating lines; then through subsequent processes such as impregnation, fiber opening and sanding, the water-based suede microfiber leather product will have a fine velvety feel and the woven background will be effectively covered;

[0118] S5, scheduled:

[0119] The required width and density are set by dry heat. The setting temperature is 40℃ lower than the melting point of modified PVA. The time should not be too long to prevent PVA from softening.

[0120] S6, impregnation:

[0121] The water-soluble colored yarn sea-island fiber is impregnated in an impregnation liquid at a certain rate. The composition of the impregnation liquid is as follows:

[0122] Water: water-based resin: color paste: cross-linking agent: functional additive: thickener = 83:20:3:2:2:1;

[0123] The functional additive is one or more of wetting, penetration, leveling, antibacterial, and pore generation additives;

[0124] The thickener is a compound of cellulose thickener and PU associative thickener. Cellulose thickener has high thickening efficiency and can be washed away by water; PU associative thickener has good thixotropy, but excessive use will affect the water resistance of the product. The use of thickener can be significantly reduced by compounding the two thickeners;

[0125] S7, water-opened fiber:

[0126] The impregnated and dried fabric passes through a continuous extrusion fiber opening device. In a water tank with 70°C water + osmotic additives, the PVA and cellulose thickeners in the fabric are dissolved, and the roller squeezes out the moisture in the fabric. The PVA and cellulose thickeners in the fabric are completely removed through multiple impregnations.

[0127] S8, Sanded:

[0128] The fabric after opening is sanded;

[0129] S9, washing and finishing:

[0130] The sanded fabric part only needs to be washed and finished to obtain a finished product with a layered color appearance.

[0131] The present invention achieves a color effect with high color fastness and rich layers by impregnating the water-soluble sea-island colored yarn fabric with a water-based PU resin that is not easy to color, or impregnating the water-soluble sea-island colored yarn fabric with a water-based PU resin that is not easy to color + color paste, or impregnating the water-soluble sea-island colored yarn fabric with a water-based PU resin that is easy to dye evenly, and dyeing with a dye of a different color from the colored yarn.

[0132] The present invention can make the water-based suede microfiber leather have a feel and style comparable to that of oil-based microfiber leather by adjusting the proportion of the sea phase and combining the impregnation and fiber opening processes.

[0133] The present invention adopts a water-based fiber opening process, which has low energy consumption, low carbon emission and low cost. The water-soluble colored yarn sea island fabric is opened by hot water, and water has no corrosion to the PET islands, and the pigments in the islands will not be partially peeled off like alkali fiber opening, and the color change before and after is small, and the masterbatch color adjustment is simple, and the development cost and process of various specific color automotive interior and electronic packaging materials are greatly reduced; the water-based fiber opening has no corrosion to the PET islands, no damage to the strength of the fibers, and significantly improves the wear resistance and physical properties of the products; the water-based fiber opening process has no damage to the PU resin, and the PU will not be lost during the fiber opening process, which greatly reduces the physical property requirements, dosage and cost of the PU.

[0134] In the present invention, after the common sea-island fiber is impregnated with PU resin, the internal sea phase is not easy to be completely opened during fiber opening, and the residual sea phase will affect the feel, style and physical properties of the finished product; the water-soluble sea-island fiber adjusts the ratio of the sea and island phases, removes the sea phase through subsequent fiber opening, forms a cavity and a release structure between the fiber and PU, and greatly improves the feel, air permeability, elasticity and mechanical properties of the finished product. The color fastness obtained by the present invention is good, and the product has a layered color appearance.

[0135] A series of performance tests were conducted on the product obtained in Example 3 above, as follows:

[0136] ①、 Figure 1 It is the DSC graph of modified PVA slice; Among them, 1.S: dipentaerythritol, Y: calcium stearate, K: antioxidant, PVA: 100.

[0137] ②, the melting point and decomposition temperature of modified PVA masterbatch, as shown in Table 1 and Figure 2 As shown:

[0138] Test items: Thermogravimetric analysis (TGA);

[0139] Test method: ASTM E1131-20, analytical instrument: TGA;

[0140] Test conditions:

[0141] Sample container material: platinum plate;

[0142] Protective gas flow rate (nitrogen): 50ml / min;

[0143] Sample purge gas flow rate (nitrogen): 50 ml / min;

[0144] Temperature: Initial temperature 30°C; increase the temperature to 600°C at 20°C / min.

[0145] Pretreatment conditions: 70℃, 100Pa, baking for 24h.

[0146] Test results:

[0147] Table 1

[0148]

[0149] ③. Water solubility of modified PVA fiber:

[0150] Test items: PVA fiber water solubility test;

[0151] Sample description: PVA fiber;

[0152] Test conditions:

[0153] Pretreatment: vacuum drying at 70°C for 24h;

[0154] Method description: Use a measuring cylinder to measure 50 ml of distilled water, pour it into a beaker, place the beaker in a constant temperature water bath, keep warm for 10 minutes at the test temperature, weigh 3 g of sample, pour it into the beaker and stir, observe the dissolution and time it.

[0155] Test results:

[0156]

[0157] The above test results show that: the melting point and decomposition temperature of modified PVA are quite different, and there is a good melt processing window; the decomposition temperature is higher than the melting temperature of PET, which basically meets the temperature requirements of PET / PVA composite melt spinning; through the PVA fiber water solubility experiment, it can be judged that PVA can be completely dissolved when PET / PVA fiber is treated in 70℃ water for 15 minutes.

[0158] ④. Comparison of energy consumption data and environmental impact of water fiber opening, liquid alkali fiber opening and non-woven toluene fiber opening:

[0159]

[0160] Comparison of economic benefits of three fiber opening processes

[0161] Cost of using sea components per ton of island fiber: benzene reduction of 2490 yuan, alkali reduction of 4200 yuan, water reduction of 1365 yuan;

[0162] Energy consumption cost of opening each ton of island fiber: benzene reduction 1140 yuan, alkali reduction 1895 yuan, water reduction 1075 yuan;

[0163] Cost of treating wastewater from opening of sea island fiber per ton: 2780 yuan for benzene reduction, 2380 yuan for alkali reduction, and 1060 yuan for water reduction;

[0164] Compared with benzene reduction and alkali reduction, the total fiber opening cost of water reduction was reduced by 45.4% and 58.7% respectively.

[0165] ⑤、Color changes of colored yarn sea island fiber before and after liquid alkali fiber opening, such as Figure 3-4 shown.

[0166] The above shows and describes the basic principles, main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0167] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing water-based environmentally friendly suede microfiber leather, characterized in that: The following steps are involved: S1, preparation of water-soluble PVA sea-phase masterbatch: The cold water soluble PVA raw material is mixed evenly with dipentaerythritol, antioxidant and calcium stearate in proportion, and then melt-extruded and pelletized by a single screw to obtain the PVA sea phase masterbatch; the melting point of the PVA masterbatch is 160℃-210℃, and the decomposition temperature is 275℃-310℃; S2, PET masterbatch preparation: Choose the type and amount of pigment according to the application; Pigment type selection: For microfibers used in electronic materials, choose halogen-free or low-halogen pigments; for microfibers used in automotive interiors, choose light-resistant and weather-resistant pigments; Dosage selection: Pigment: 20-40 parts; PET: 60-80 parts; Other additives: 2-5 parts; S3, preparation and compounding of water-soluble dyed yarn sea-island fibers: Mix water-soluble PVA sea-phase masterbatch, PET color masterbatch and PET in proportion; S4, Weaving: Adjust the fabric's float length, density and structure according to product requirements; S5, scheduled: The required width and density are set by dry heat. The setting temperature is 30-40℃ lower than the melting point of modified PVA. The time should not be too long to prevent PVA from softening. S6, impregnation: The water-soluble colored yarn sea-island fiber is impregnated in the impregnation liquid at a certain rate; S7, water-opened fiber: The impregnated and dried fabric passes through a continuous extrusion fiber opening device. In a water tank with 50-70℃ water + osmotic additives, the PVA and cellulose thickeners in the fabric are dissolved, and the roller squeezes out the moisture in the fabric. The PVA and cellulose thickeners in the fabric are completely removed through multiple impregnations. S8, Sanded: The fabric after opening is sanded; S9, washing and finishing: The sanded fabric part only needs to be washed and finished to obtain a finished product with a layered color appearance.

2. The method for preparing a water-based environmentally friendly suede microfiber leather according to claim 1, characterized in that: The mixing ratio of the PVA raw material to dipentaerythritol, antioxidant and calcium stearate in S1 is 50:5-10:1-1.5:1-3.

3. The method for preparing a water-based environmentally friendly suede microfiber leather according to claim 1, characterized in that: The ratio of water-soluble PVA sea-phase masterbatch: PET masterbatch: PET in S3 is 15-30: 1-15: 60-84; the ratio of water-soluble PVA sea-phase masterbatch is adjusted according to the product feel and style requirements, and the ratio of PET masterbatch and PET is adjusted according to the product color and color style.

4. The method for preparing a water-based environmentally friendly suede microfiber leather according to claim 1, characterized in that: The composition of the impregnation liquid in S6 is as follows: Water: water-based resin: color paste: cross-linking agent: functional additive: thickener = 62-83: 15-20: 0.2-3: 0.5-2: 0.5-2: 0.5-1.

5. The method for preparing a water-based environmentally friendly suede microfiber leather according to claim 4, characterized in that: The functional additive is one or more of wetting, penetration, leveling, antibacterial and pore generation additives.

6. The method for preparing a water-based environmentally friendly suede microfiber leather according to claim 4, characterized in that: The thickener is compounded from a cellulose thickener and a PU associative thickener.

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