Polyurethane synthetic leather for comfortable and soft sports and leisure shoes and preparation method of polyurethane synthetic leather

Abstract

The invention discloses polyurethane synthetic leather for comfortable and soft sports and leisure shoes and a preparation method thereof.According to the product, high-elasticity regenerated fibers serve as raw materials, an elastic weaving technology and a needling technology are fused, and a laminated non-woven fabric base of a special structure is produced to serve as a base material; the preparation method comprises the following steps: coating a novel organic silicon modified polyurethane resin coating on a base material by adopting a wet slurry coating secondary forming process method, sequentially carrying out condensation, washing and drying to obtain a soft polyurethane wet base semi-finished product, and finally transferring the obtained semi-finished product through dry release paper to make a surface, so as to obtain the polyurethane wet base. And a polyurethane synthetic leather finished product for comfortable and soft sports and leisure shoes is produced. The product disclosed by the invention has the characteristics of high physical strength, light weight, soft texture, excellent resilience and wrinkle resistance, easiness in shaping and processing of finished shoes, and comfort and attractiveness in wearing, and overcomes the defects of stiff texture and poor wearing comfort of the traditional polyurethane synthetic leather for high-physical-property shoes.

Description

Technical Field

[0001] The invention belongs to the field of polyurethane synthetic leather, and particularly relates to comfortable and soft polyurethane synthetic leather for sports and leisure shoes and a preparation method thereof. Background Art

[0002] The common high-property space materials used in sports and leisure shoes on the market currently have a stiff feel, poor crease recovery, and affect wearing comfort and aesthetics. In addition, some products do not have dimensional stability and are easily deformed when worn. Based on market and consumer demand, in order to meet the demands of shoemaking and consumers for improved wearing comfort. Therefore, this patent develops a soft composite material product with a soft texture and dimensional stability. The comfortable and soft polyurethane synthetic leather with high physical strength is used in the production of sports and leisure shoes, which is of great significance to improving the processing performance of finished shoes and upgrading the consumer wearing experience. Summary of the invention

[0003] The present invention discloses a method for preparing a comfortable and soft polyurethane synthetic leather for sports and leisure shoes. This product first uses high-elasticity regenerated fiber (PTT) as a raw material. The high-elasticity regenerated fiber is formed by condensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO). Then, by integrating the elastic weaving technology and the needle punching technology, a laminated non-woven fabric base with a special structure is produced as a substrate. After the structural substrate is coated, it has good flatness and is light and soft. Secondly, silicone-modified polyurethane resin slurries a and b are coated on the laminated non-woven fabric substrate respectively, and then the soft polyurethane wet-method bass semi-finished product is obtained through coagulation, washing, and drying in sequence; finally, the semi-finished product is transferred through dry release paper to produce a comfortable and soft polyurethane synthetic leather finished product for sports and leisure shoes. The product of the present invention has the characteristics of high physical strength, light weight and soft texture, excellent rebound and wrinkle resistance, easy shoe shaping processing, comfortable and beautiful wearing, which makes up for the shortcomings of traditional high-physical property polyurethane synthetic leather for shoes, such as stiff texture and poor wearing comfort. In addition, the entire production process and products are environmentally friendly and meet the direction of industrial development and market orientation.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0006] (1) Preparation of a laminated non-woven fabric substrate with a special structure, using high elastic regenerated fiber (PTT) obtained by polycondensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO) as a raw material, respectively using elastic knitting technology and needle punching technology to produce corresponding elastic cloth base and needle punched non-woven fabric base, then stacking the elastic cloth base on the non-woven fabric, using needle punching entanglement processing technology to make the single cloth base fibers entangle and bond with each other to form a structural interlocking mesh structure, thereby obtaining a laminated non-woven fabric base with a special structure, the density of the laminated cloth base is 150-200kg / m 3 , the upper main structure is a knitted surface, and the lower main structure is a non-woven surface; preferably, the thickness of the elastic fabric base is 0.3-0.4mm;

[0007] (2) The laminated non-woven fabric obtained in step (1) is used as a substrate, and a silicone-modified polyurethane resin slurry a with a thickness of 10-15 filaments and a silicone-modified polyurethane resin slurry b with a thickness of 35-45 filaments are sequentially coated on the knitted surface thereof, and then the slurry is successively subjected to coagulation, water washing and drying to obtain a soft polyurethane wet-fabricated base semi-finished product; the coating resin slurry contains 10%-20% of an organosiloxane polymer, and the organosiloxane polymer has excellent softness and resilience due to its unique surface properties. Introducing the silicone-modified polyurethane resin containing the substance into the coating resin can improve the softness of the product and the wrinkle resilience.

[0008] The viscosity of the silicone-modified polyurethane resin slurry a is 5000-6000cps / 36°C, and it is mixed by the following components in parts by mass:

[0009] DMF 80-100 parts,

[0010] 100-120 parts of silicone modified polyurethane resin,

[0011] BYK-6798 penetrant 0.3-0.5 parts;

[0012] The viscosity of the silicone-modified polyurethane slurry a is relatively low, and it has the characteristics of easy penetration and good bonding with the base fabric. When the viscosity of the silicone-modified polyurethane slurry a is less than 5000cps, the viscosity is too low, the slurry penetrates too quickly, and more penetrates into the base fabric, which has a greater impact on the softness of the product feel; when the viscosity of the silicone-modified polyurethane slurry a is greater than 6000cps, it is not conducive to the penetration of the slurry and affects the bonding strength with the base fabric.

[0013] The viscosity of the organosilicon-modified polyurethane resin slurry b is 10000-12000 cps / 36° C., and the slurry is prepared by mixing the following components in parts by mass:

[0014] DMF 50-60 parts,

[0015] 100-120 parts of silicone modified polyurethane resin,

[0016] S-11 cell regulator 1-3 parts,

[0017] 10-20 parts of inorganic filler;

[0018] The viscosity of the silicone modified polyurethane resin slurry b is relatively high, and it has two characteristics: first, it has good pore performance and good pore uniformity and support; second, it has good penetration and adhesion performance to the primary coating. When the viscosity of the silicone modified polyurethane resin slurry b is lower than 10,000 cps, the pore performance and pore uniformity are not good. When the viscosity of the silicone modified polyurethane resin slurry b is higher than 12,000 cps, it is not conducive to the penetration and adhesion of the slurry, and affects the interlayer peeling strength.

[0019] (3) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (2) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adopts an innovative wet slurry coating secondary molding process, that is, a floating knife is first used to scrape the knitted surface of the laminated non-woven fabric base with a silicone modified polyurethane resin slurry a, and then a silicone modified polyurethane resin slurry b is further coated to form a final wet coating. The use of a wet slurry coating secondary molding process has the following advantages over the conventional wet one-time molding method: (1) The silicone modified polyurethane slurry a can make the slurry penetration more uniform, improve the bonding strength with the cloth base, and make the product have high peeling strength and good stability; (2) The silicone modified polyurethane resin slurry b is easy to pore and has good pore uniformity support performance, so that the product has a soft texture and excellent rebound and wrinkle resistance. The present invention adopts a coating secondary molding process. Through the coordinated use of slurry a and slurry b, the final product can not only have the characteristics of high physical strength, but also have light weight and soft texture, and excellent rebound and wrinkle resistance. The properties of the polyurethane synthetic leather for comfortable and soft sports and leisure shoes made by the present invention meet the following requirements: peel strength ≥ 90N / 3CM; tear strength ≥ 60N; hardness ≥ 3.5mm; rebound wrinkle resistance ≤ 2 levels (1-5 levels, the smaller the level, the better the wrinkle resistance); bulk density ≤ 350Kg / m 3 . DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with examples so that those skilled in the art can better understand the present invention and implement it, but the examples are not intended to limit the present invention. In addition, the preparation processes in the following examples are conventional means in the prior art unless otherwise specified, and therefore, they are not described in detail; the parts in the following embodiments all refer to parts by mass.

[0023] The raw material information used in the following examples is as follows:

[0024] Silicone-modified polyurethane resin SW-6061H is a product of Hefei Anli Polyurethane New Materials Co., Ltd.;

[0025] BYK-6798 penetrant is a product of BYK Company of Germany;

[0026] S-11 cell regulator is a product of Jiande Shunfa Chemical Additives Co., Ltd.;

[0027] The inorganic filler Al(OH)3 was from Jinan Taixing Fine Chemical Co., Ltd.

[0028] The above reagents are only for illustrating the sources and components of the reagents used in the experiments of the present invention so as to fully disclose the information, and do not mean that the present invention cannot be realized by using other similar reagents or reagents provided by other suppliers.

[0029] Example 1

[0030] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0031] (1) Preparation of a laminated non-woven fabric substrate with a special structure, using terephthalic acid (PTA) and 1,3-propylene glycol (PDO) 1,3-propylene glycol (PDO) high elastic regenerated fiber (PTT) as raw materials, respectively using elastic weaving technology and needle punching technology to produce corresponding elastic cloth base and needle punched non-woven fabric base, and then stacking the elastic cloth base with a thickness of 0.35 mm on the needle punched non-woven fabric base, using needle punching entanglement processing technology to make the single cloth base fibers entangled and bonded to each other to form a structural interlocking mesh structure, thereby obtaining a laminated non-woven fabric base with a special structure, and the density of the laminated cloth base is 150kg / m 3 The knitted surface of the upper main structure is side A, and the non-woven surface of the lower main structure is side B.

[0032] (2) The laminated non-woven fabric obtained in step (1) is used as a substrate, and a polyurethane coating slurry a with a thickness of 10 strands is firstly applied to the surface A of the fabric substrate by a slurry secondary coating molding process to form a layer of wet polyurethane coating film on the surface A of the fabric substrate, and then 35 strands of polyurethane slurry b are coated on the film again, and then the film is subjected to coagulation, water washing and drying in sequence to obtain a comfortable and soft polyurethane synthetic leather wet-process bass semi-finished product for sports and leisure shoes; wherein:

[0033] The silicone-modified polyurethane resin slurry a is prepared by mixing the following components in parts by mass:

[0034] DMF 80 parts

[0035] 100 parts of silicone modified polyurethane resin

[0036] BYK-6798 penetrant 0.3 parts

[0037] Viscosity: 5000cps / 36℃

[0038] The silicone-modified polyurethane resin slurry b is mixed by the following components in parts by mass:

[0039] DMF 60 parts

[0040] 100 parts of silicone modified polyurethane resin

[0041] S-11 Cell Regulator 1 part

[0042] Inorganic filler Al(OH)3 10 parts

[0043] Viscosity: 11000cps / 36℃;

[0044] (3) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (2) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0045] The comfortable and soft polyurethane synthetic leather for sports casual shoes made in this embodiment has high physical strength, light weight and soft texture, and excellent rebound and wrinkle resistance. Peel strength 100N / 3CM; tear strength 60N; hardness 3.5mm; rebound and wrinkle resistance 2 levels (1-5 levels, the smaller the level, the better the wrinkle resistance); bulk density 300kg / m 3 .

[0046] Example 2

[0047] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0048] (1) Preparation of a laminated non-woven fabric substrate with a special structure, using high elastic regenerated fiber (PTT) obtained by polycondensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO) as raw material, respectively using elastic weaving technology and needle punching technology to produce corresponding elastic cloth base and needle punched non-woven fabric base, then stacking the elastic cloth base with a thickness of 0.30 mm on the needle punched non-woven fabric base, using needle punching entanglement processing technology to make the single cloth base fibers entangle and bond with each other to form a structural interlocking mesh structure, thereby obtaining a laminated non-woven fabric base with a special structure, the density of the laminated cloth base is 160 kg / m 3 The knitted surface of the upper main structure is side A, and the non-woven surface of the lower main structure is side B.

[0049] (2) The laminated non-woven fabric obtained in step (1) is used as a substrate, and a polyurethane coating slurry a with a thickness of 12 strands is firstly applied to the surface A of the fabric substrate by a slurry secondary coating molding process to form a layer of wet polyurethane coating film on the surface A of the fabric substrate, and then 35 strands of polyurethane slurry b are coated on the film again, and then the film is subjected to coagulation, water washing and drying in sequence to obtain a comfortable and soft polyurethane synthetic leather wet-process bass semi-finished product for sports and leisure shoes; wherein:

[0050] The silicone-modified polyurethane resin slurry a is prepared by mixing the following components in parts by mass:

[0051] DMF 60 parts

[0052] 100 parts of silicone modified polyurethane resin

[0053] BYK-6798 penetrant 0.4 parts

[0054] Viscosity: 5500cps / 36℃

[0055] The silicone-modified polyurethane resin slurry b is mixed by the following components in parts by mass:

[0056] DMF 60 parts

[0057] 110 parts of silicone modified polyurethane resin

[0058] S-11 Cell Regulator 3 parts

[0059] Inorganic filler Al(OH)3 15 parts

[0060] Viscosity: 10000cps / 36℃

[0061] (3) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (2) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0062] The comfortable and soft polyurethane synthetic leather for sports casual shoes made in this embodiment has high physical strength, light weight and soft texture, and excellent rebound and wrinkle resistance. Peel strength 105N / 3CM; tear strength 70N; hardness 4.0mm; rebound and wrinkle resistance 2 levels (1-5 levels, the smaller the level, the better the wrinkle resistance); bulk density 250kg / m 3 .

[0063] Example 3

[0064] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0065] (1) Preparation of a laminated non-woven fabric substrate with a special structure, using high elastic regenerated fiber (PTT) obtained by polycondensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO) as raw material, respectively using elastic weaving technology and needle punching technology to produce corresponding elastic cloth base and needle punched non-woven fabric base, then stacking the elastic cloth base with a thickness of 0.40 mm on the needle punched non-woven fabric base, using needle punching entanglement processing technology to make the single cloth base fibers entangle and bond with each other to form a structural interlocking mesh structure, thereby obtaining a laminated non-woven fabric base with a special structure, the density of the laminated cloth base is 200 kg / m 3 The knitted surface of the upper main structure is side A, and the non-woven surface of the lower main structure is side B.

[0066] (2) The laminated non-woven fabric obtained in step (1) is used as a substrate, and a slurry secondary coating molding process is used to first apply a 15-filament polyurethane coating slurry a to the surface A of the fabric base to form a layer of wet polyurethane coating film, and then 45-filament polyurethane slurry b is applied to the film again, and then the film is subjected to coagulation, water washing and drying in sequence to obtain a comfortable and soft polyurethane synthetic leather wet-process bass semi-finished product for sports and leisure shoes; wherein:

[0067] The silicone-modified polyurethane resin slurry a is prepared by mixing the following components in parts by mass:

[0068] DMF 80 parts

[0069] 120 parts of silicone modified polyurethane resin

[0070] BYK-6798 penetrant 0.5 parts

[0071] Viscosity: 6000cps / 36℃

[0072] The silicone-modified polyurethane resin slurry b is mixed by the following components in parts by mass:

[0073] DMF 80 parts

[0074] 120 parts of silicone modified polyurethane resin

[0075] S-11 Cell Regulator 3 parts

[0076] Inorganic filler Al(OH)3 20 parts

[0077] Viscosity: 11500cps / 36℃

[0078] (3) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (2) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0079] The comfortable and soft polyurethane synthetic leather for sports casual shoes made in this embodiment has high physical strength, light weight and soft texture, and excellent rebound and wrinkle resistance. Peel strength 110N / 3CM; tear strength 70N; hardness 4.5mm; rebound and wrinkle resistance level 1 (level 1-5, the smaller the level, the better the wrinkle resistance); bulk density 280kg / m 3 .

[0080] Comparative Example 1 (Compared with Example 3)

[0081] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0082] (1) Preparation of a laminated non-woven fabric substrate with a special structure, using high elastic regenerated fiber (PTT) obtained by polycondensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO) as raw material, respectively using elastic weaving technology and needle punching technology to produce corresponding elastic cloth base and needle punched non-woven fabric base, then stacking the elastic cloth base with a thickness of 0.40 mm on the needle punched non-woven fabric base, using needle punching entanglement processing technology to make the single cloth base fibers entangle and bond with each other to form a structural interlocking mesh structure, thereby obtaining a laminated non-woven fabric base with a special structure, the density of the laminated cloth base is 200 kg / m 3 The knitted surface of the upper main structure is side A, and the non-woven surface of the lower main structure is side B.

[0083] (2) The laminated non-woven fabric obtained in step (1) is used as a substrate, and a conventional one-time coating molding process is used to coat 60 filaments of polyurethane slurry b on the surface A of the fabric base, and then the process is successively condensed, washed and dried to obtain a comfortable and soft polyurethane synthetic leather wet-process bass semi-finished product for sports and leisure shoes; wherein:

[0084] The silicone-modified polyurethane resin slurry b is mixed by the following components in parts by mass:

[0085]

[0086] (3) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (2) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0087] The comfortable and soft polyurethane synthetic leather for sports casual shoes made in this comparative example has poor physical strength, and its softness and rebound wrinkle resistance are average. Peel strength 70N / 3CM; tear strength 50N; hardness 3.0mm; rebound wrinkle resistance 3 levels (1-5 levels, the smaller the level, the better the wrinkle resistance); bulk density 280kg / m 3 .

[0088] Comparative Example 2 (Compared with Example 3)

[0089] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0090] (1) Preparation of a laminated non-woven fabric substrate with a special structure, using high elastic regenerated fiber (PTT) obtained by polycondensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO) as raw material, respectively using elastic weaving technology and needle punching technology to produce corresponding elastic cloth base and needle punched non-woven fabric base, then stacking the elastic cloth base with a thickness of 0.40 mm on the needle punched non-woven fabric base, using needle punching entanglement processing technology to make the single cloth base fibers entangle and bond with each other to form a structural interlocking mesh structure, thereby obtaining a laminated non-woven fabric base with a special structure, the density of the laminated cloth base is 200 kg / m 3 The knitted surface of the upper main structure is side A, and the non-woven surface of the lower main structure is side B.

[0091] (2) The laminated non-woven fabric obtained in step (1) is used as a substrate, and a conventional one-time coating molding process is used to coat 60 filaments of polyurethane slurry a on the surface A of the fabric base, and then the process is successively condensed, washed and dried to obtain a comfortable and soft polyurethane synthetic leather wet-process bass semi-finished product for sports and leisure shoes; wherein:

[0092] The silicone-modified polyurethane resin slurry a is prepared by mixing the following components in parts by mass:

[0093]

[0094] (3) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (2) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0095] The polyurethane synthetic leather for comfortable and soft sports casual shoes made in this comparative example has poor softness and rebound wrinkle resistance, and the product density is large, which loses the characteristics of light weight. Peel strength 110N / 3CM; tear strength 70N; hardness 2.0mm; rebound wrinkle resistance 4 levels (1-5 levels, the smaller the level, the better the wrinkle resistance); bulk density 420kg / m 3 .

[0096] Comparative Example 3

[0097] A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes comprises the following steps:

[0098] (1) The thickness is 0.35mm and the density is 150kg / m 3 Ordinary polyester needle-punched non-woven fabrics are first coated with 10-filament polyurethane coating slurry a on one side of the polyester needle-punched non-woven fabric base by a slurry secondary coating molding process to form a layer of wet polyurethane coating film on one side of the fabric base, and then 35-filament polyurethane slurry b is coated on the film again, and then coagulation, washing and drying are performed in sequence to obtain a comfortable and soft polyurethane synthetic leather wet-process bass semi-finished product for sports and leisure shoes; wherein:

[0099] The silicone-modified polyurethane resin slurry a is prepared by mixing the following components in parts by mass:

[0100] DMF 80 parts

[0101] 100 parts of silicone modified polyurethane resin

[0102] BYK-6798 penetrant 0.3 parts

[0103] Viscosity: 5000cps / 36℃

[0104] The silicone-modified polyurethane resin slurry b is mixed by the following components in parts by mass:

[0105] DMF 60 parts

[0106] 100 parts of silicone modified polyurethane resin

[0107] S-11 Cell Regulator 1 part

[0108] Inorganic filler Al(OH)3 10 parts

[0109] Viscosity: 11000cps / 36℃

[0110] (2) The soft and comfortable polyurethane synthetic leather for sports and leisure shoes prepared in step (1) is processed by dry release paper to obtain a finished product of polyurethane synthetic leather for sports and leisure shoes.

[0111] The comfortable and soft polyurethane synthetic leather for sports casual shoes made in this comparative example has a stiff feel and poor rebound and wrinkle resistance. Peel strength 95N / 3CM; tear strength 50N; hardness 2.1mm; rebound and wrinkle resistance 4 levels (1-5 levels, the smaller the level, the better the wrinkle resistance); bulk density 300kg / m 3 .

[0112] Obviously, the described embodiments are only some embodiments of the present invention, but not all 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.

Claims

1. A method for preparing comfortable and soft polyurethane synthetic leather for sports and leisure shoes, characterized in that: The following steps are involved: (1) stacking an elastic fabric base on a non-woven fabric base, and using a needle-punching entanglement process to make the fibers in the elastic fabric base and the non-woven fabric base entangle and bond with each other to form a structurally interlocking mesh structure, thereby obtaining a laminated non-woven fabric base; the upper main structure of the laminated non-woven fabric base is a knitted surface, and the lower main structure is a non-woven surface; (2) coating the knitted surface of the laminated non-woven fabric obtained in step (1) with the organosilicon-modified polyurethane resin slurry a to form a wet polyurethane coating film; then coating the surface of the polyurethane coating film with the organosilicon-modified polyurethane resin slurry b, and sequentially subjecting the polyurethane coating film to coagulation, water washing, and drying to obtain a soft polyurethane wet-fabricated base semi-finished product; wherein: The organosilicon-modified polyurethane resin slurry a is prepared by mixing the following components in parts by mass: DMF 80-100 parts, 100-120 parts of silicone modified polyurethane resin, Penetrant 0.3-0.5 parts; The organosilicon-modified polyurethane resin slurry b is prepared by mixing the following components in parts by mass: (3) The soft polyurethane wet-process base semi-finished product prepared in step (2) is subjected to dry-process release paper surface forming to finally obtain a comfortable and soft polyurethane synthetic leather product for sports and leisure shoes.

2. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to claim 1, characterized in that: The elastic fabric base and non-woven fabric base are both made of highly elastic recycled fibers and are produced using elastic weaving technology and needle punching technology respectively; the density of the laminated non-woven fabric base is 150-200kg / m 3 .

3. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to claim 1, characterized in that: The viscosity of the organosilicon-modified polyurethane resin slurry a is 5000-6000 cps / 36°C.

4. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to claim 1, characterized in that: The coating thickness of the organosilicon-modified polyurethane resin slurry a is 10-15 filaments.

5. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to claim 1, characterized in that: The viscosity of the organosilicon-modified polyurethane resin slurry b is 10000-12000 cps / 36°C.

6. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to claim 1, characterized in that: The coating thickness of the organosilicon-modified polyurethane resin slurry b is 35-45 filaments.

7. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to any one of claims 1 to 4, characterized in that: The organosilicon-modified polyurethane resin is organosilicon-modified polyurethane resin SW-6061H.

8. The method for preparing the comfortable and soft polyurethane synthetic leather for sports and leisure shoes according to any one of claims 1 to 4, characterized in that: The penetrant is BYK-6798 penetrant.

9. A comfortable and soft polyurethane synthetic leather for sports and leisure shoes, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 8.

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