Thermoplastic silicone synthetic leather and method for preparing the same

Abstract

The present application relates to the technical field of synthetic leather, and discloses thermoplastic silicone synthetic leather and a preparation method thereof; from bottom to top, the thermoplastic silicone synthetic leather sequentially comprises a base cloth layer, a hot melt adhesive layer, a leather surface layer, wherein the raw material of the hot melt adhesive layer is modified PUR glue, the modified PUR glue is obtained by extrusion of polyol, isocyanate, thermoplastic polyurethane and silicon-containing polyol; the raw material of the leather surface layer is thermoplastic silicone, and the thermoplastic silicone is obtained by adding additives after extrusion of thermoplastic resin, silicone rubber and crosslinking agent. The thermoplastic silicone is used as the leather surface layer, good hand feeling and stain resistance can be achieved without surface treatment, the adhesion between the leather and the base cloth is completed by casting, the production process and equipment investment are reduced, and the production efficiency is improved. In order to ensure the good adhesion of the modified PUR glue, the silicon-containing polyol is introduced into the modified PUR glue, so that the modified PUR glue has good moisture crosslinking reaction and good compatibility with the thermoplastic silicone leather, thereby achieving good adhesion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of synthetic leather, in particular, to a thermoplastic silicone synthetic leather and a preparation method thereof. BACKGROUND

[0002] Synthetic leather is a plastic product similar to leather in feel and can replace leather. Generally, synthetic leather is obtained by dissolving polyurethane (PU) in N,N-dimethylformamide (DMF), butanone (MEK) and toluene (TOL), and then coating on the surface of a base cloth. Therefore, a large amount of DMF, MEK and TOL remains in the synthetic leather, which are harmful to human body and affect human health. In addition, the traditional production process of synthetic leather is complex, the production area is large, the production line needs a length of 130-160 m, the equipment investment is high, and the production efficiency is low.

[0003] The thermoplastic polyurethane elastomer (TPU) film is a thermoplastic TPU elastomer. Since the TPU film has good elasticity, good physical properties and various mechanical strengths, it is widely used in resin processing methods such as extrusion, injection molding and calendering. The finished products cover the range of industrial applications and essential consumer goods. At present, the TPU leather composite processing on the market is usually to heat and melt TPU particles, and then complete flow casting and co-extrusion of the TPU particles and hot melt adhesive to bond the TPU film and the leather base cloth, thereby forming the final leather product. The production process of the TPU leather is relatively simple, the production area is small, the production line only needs a length of 20-35 m, the equipment investment is low, the production efficiency is high, and there is no solvent pollution. Therefore, the TPU leather is a new generation of environmentally friendly leather.

[0004] However, the TPU leather and the traditional synthetic leather have the common shortcomings of strong surface roughness, poor softness and poor stain resistance. Therefore, the surface of the TPU leather needs to be coated again, which increases the production process and limits the use and development of the TPU leather.

[0005] The silicone leather is produced by an environmentally friendly solvent-free production process. The water and gas generated in the leather production process can be recycled or treated in an environmentally friendly manner. Since the raw materials and the production process do not contain toxic ingredients, the silicone leather is safe and odorless. The silicone leather has good hand feeling and stain resistance, but has low strength, poor wear resistance and scratch resistance, and is easy to scratch. SUMMARY

[0006] The technical problems solved by the present application are:

[0007] The TPU leather has the problems of strong surface roughness, poor softness and poor stain resistance, and the silicone leather has the problems of poor scratch resistance and poor wear resistance.

[0008] The technical scheme adopted by the present application is as follows:

[0009] In view of the above technical problems, the present application aims to provide a thermoplastic silicone synthetic leather and a preparation method thereof.

[0010] The specific content is as follows:

[0011] Firstly, the present application provides a thermoplastic silicone synthetic leather, which is sequentially attached from bottom to top with:

[0012] a base cloth layer,

[0013] a hot melt adhesive layer, raw material of which is modified PUR glue (i.e. moisture curing reaction type polyurethane hot melt adhesive), which is obtained by mixing extrusion of aliphatic polyol, isocyanate, silicon-containing polyol, chain extender and catalyst;

[0014] a leather surface layer, raw material of which is thermoplastic silicone, which is obtained by adding additives after extrusion of thermoplastic resin, silicone rubber and crosslinking agent.

[0015] Secondly, the present application provides a preparation method of the aforementioned thermoplastic silicone synthetic leather, comprising the following steps:

[0016] adding the modified PUR glue and the thermoplastic silicone into extruders respectively for melting and plasticizing, and then simultaneously casting into a composite film, and introducing the base cloth at the outlet of the film casting;

[0017] During the casting process, the silicone rubber particles in the thermoplastic silicone form protrusions with a depth of 10-20 μm in the leather surface layer, and a large number of soft and tiny protrusions have good hand feeling and excellent stain resistance.

[0018] The base cloth is introduced to the side close to the modified PUR glue.

[0019] Thirdly, the present application provides a preparation method of the aforementioned thermoplastic silicone, comprising the following steps:

[0020] (A1) blending the thermoplastic resin, the silicone rubber and the crosslinking agent to form a first blend;

[0021] (A2) adding the first blend from the front end of the extruder, adding the catalyst from the middle end of the extruder, and adding the additives from the rear end of the extruder, and then extruding to obtain.

[0022] Fourthly, the present application provides a preparation method of the aforementioned modified PUR glue, comprising the following steps:

[0023] (B1) the aliphatic polyol, isocyanate, silicon-containing polyol are mixed uniformly to obtain a first blend; the catalyst, antioxidant, chain extender, silicon dioxide are added to the first blend to obtain a second blend;

[0024] (B2) the second blend is added into an extruder and then treated by negative pressure to obtain the modified PUR glue.

[0025] Technical mechanism and beneficial effects of the present application:

[0026] At present, although the thermoplastic organic leather has been introduced with organic silicon, the surface energy of the organic silicon is low, which can improve the comfort and stain resistance of the artificial leather, but also reduces the bonding performance of the hot melt adhesive, and further causes the separation of the base fabric and the thermoplastic organic leather layer. In addition, if the adhesive used for bonding is not suitable, the thermoplastic organic leather will not be able to bond the base fabric. Based on this, the inventors found that:

[0027] The thermoplastic organic silicon is used as the leather surface layer, which does not need to be surface treated to achieve good hand feeling and stain resistance, and the bonding of the leather and the base fabric is completed by using the flow coating method, which reduces the production process and equipment investment, and improves the production efficiency. In order to ensure the good bonding performance of the modified PUR glue, the silicon-containing polyol is introduced into the modified PUR glue, which ensures that the modified PUR glue has good moisture crosslinking reaction and good compatibility with the thermoplastic organic leather, and further plays a good bonding effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The SEM graph of the thermoplastic organic silicon prepared in Example 1; the scale in the lower right corner of the graph is 10 μm;

[0029] Figure 2 The AFM graph of the composite film prepared in Example 1. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below. The specific conditions in the embodiments are not specified, and are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be purchased on the market.

[0031] Technical scheme:

[0032] Firstly, the present application provides a thermoplastic organic silicon synthetic leather, which is sequentially bonded from bottom to top with:

[0033] a base fabric layer,

[0034] A hot melt adhesive layer, raw material of which is modified PUR glue, which is obtained by blending extrusion of aliphatic polyol, isocyanate, silicon-containing polyol, silicon dioxide, chain extender and catalyst;

[0035] A leather surface layer, raw material of which is thermoplastic silicone, which is obtained by extrusion of thermoplastic resin, silicone rubber and crosslinking agent and then adding additives.

[0036] In the present application, the material of the base cloth layer includes at least one of Lycra cotton, non-woven fabric, microfiber fabric, suede and suede.

[0037] Secondly, the present application provides a preparation method of thermoplastic silicone synthetic leather, characterized in that it comprises the following steps:

[0038] The modified PUR glue and the thermoplastic silicone are respectively added into the extruders for melting and plasticizing, and then simultaneously formed into a composite film through casting, and the base cloth is introduced to the side close to the modified PUR glue at the outlet of the casting film.

[0039] The base cloth is introduced to the side close to the modified PUR glue.

[0040] Further, the thickness of the hot melt adhesive layer is 0.05-0.2mm, and the extrusion temperature is 130-160℃; the thickness of the leather surface layer is 0.1-3mm, and the extrusion temperature is 150-180℃; the film is formed by casting extrusion, and the bonding pressure is 1-3MPa.

[0041] In detail, the specific preparation method is as follows:

[0042] Select a flat and intact base cloth, wash and dry it;

[0043] The thermoplastic silicone is added into the first extruder for melting and plasticizing, the modified PUR glue is added into the second extruder for melting and plasticizing, and the two are simultaneously formed into a composite film through casting machine co-extrusion; the thickness of the leather surface layer is 0.1-3mm, and the extrusion temperature is 150-180℃; the thickness of the hot melt adhesive layer is 0.05-0.2mm, and the extrusion temperature is 130-160℃. The film is formed by casting extrusion, and the height of the film extruded from the die casting to the bonding of the forming roller is 8-10cm, and the bonding pressure is 1-3MPa. The bonding and compounding are carried out between at least two rollers, and the surface of the roller close to the leather surface layer is provided with patterns.

[0044] At 8-10cm below the outlet of the composite casting film, the base cloth is introduced from the side close to the modified PUR glue film, bonded by the pressure between the two rollers behind to form the thermoplastic silicone leather, and the moisture curing crosslinking is completed in the air.

[0045] After the bonding is completed, the leather needs to stay in the air for 0.5-3min, and after complete curing, it can be wound up.

[0046] Thirdly, the present application provides a preparation method of thermoplastic silicone, comprising the following steps:

[0047] (A1) blending thermoplastic resin, silicone rubber and crosslinking agent to form a first blend;

[0048] (A2) adding the first blend from the front end of the extruder, adding the catalyst from the middle end of the extruder, adding the additive from the rear end of the extruder, and obtaining by extrusion.

[0049] The obtained thermoplastic silicone, the silicone rubber is uniformly distributed in the thermoplastic resin in the form of particles, and the particle diameter of the silicone rubber is 2-20 μm.

[0050] Further, in the raw materials of the thermoplastic silicone,

[0051] The thermoplastic resin comprises at least one of polyethylene, polypropylene, thermoplastic polyurethane elastomer, styrene-ethylene-butylene-styrene block copolymer, and styrene-butadiene-styrene block copolymer;

[0052] The silicone rubber contains vinyl units in the molecule, and the mass fraction of the vinyl units is 0.08%-0.16%, and the molecular weight of the silicone rubber is 400,000-900,000;

[0053] The crosslinking agent is hydrogen-containing silicone oil with a hydrogen content of 0.5%-1.7%, and the viscosity of the hydrogen-containing silicone oil is 2-500 mPa·s at 25°C;

[0054] The catalyst comprises platinum catalyst, and the platinum catalyst comprises at least one of chloroplatinic acid-isopropyl alcohol, chloroplatinic acid-tetramethyldivinylsiloxane, and chloroplatinic acid-diethyl phthalate;

[0055] The anti-ultraviolet agent comprises at least one of benzoic acid anti-ultraviolet agent, xylene ketone anti-ultraviolet agent, and benzotriazole anti-ultraviolet agent;

[0056] The antioxidant comprises at least one of tetra[methylene-3,3',5-(di-tert-butyl-4-hydroxy-phenyl) propionate] pentaerythritol ester, N,N'-bis[[3-(3,5)-di-tert-butyl-4-hydroxyphenyl] propionyl] ethylenediamine, tris[2,4-di-tert-butylphenyl] phosphite, and dipentaerythritol distearyl phosphite.

[0057] The components of the raw materials of the thermoplastic silicone comprise, by weight fraction, 50-80 parts of thermoplastic resin, 20-50 parts of silicone rubber, 0.5-2 parts of crosslinking agent, 0.1-1 part of catalyst, and additive; the additive comprises 0.5-1.5 parts of anti-ultraviolet agent and 0.5-1.5 parts of antioxidant.

[0058] Fourthly, the application provides a preparation method of the modified PUR glue, comprising the following steps:

[0059] (B1) uniformly blending the aliphatic polyol, the isocyanate and the silicon-containing polyol to obtain a first blend; adding the catalyst, the antioxidant, the chain extender and the silicon dioxide into the first blend to obtain a second blend;

[0060] (B2) adding the second blend into an extruder and then performing negative pressure treatment to obtain the modified PUR glue.

[0061] Further, in each component of the modified PUR glue,

[0062] the aliphatic polyol comprises at least one of ethylene glycol, diethylene glycol, propylene glycol, methyl propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,5-pentanediol and dodecyl hexanediol;

[0063] the silicon-containing polyol is hydroxypropyl-terminated polydimethylsiloxane;

[0064] the isocyanate comprises at least one of triphenylmethane triisocyanate, diphenylmethane diisocyanate and polyhexamethylene diisocyanate;

[0065] the chain extender comprises at least one of 1,6-hexanediol, methyl propylene glycol and 1,4-butanediol;

[0066] the catalyst comprises at least one of dibutyltin dilaurate, stannous octoate, dibutylene acetate, triethylenediamine and dimorpholinyl diethyl ether;

[0067] the antioxidant comprises at least one of 2,6-tert-butyl-4-methylphenol and tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester.

[0068] Each component of the modified PUR glue comprises, by weight fraction, 15-40 parts of the aliphatic polyol, 10-25 parts of the silicon-containing polyol, 20-30 parts of the isocyanate, 20-30 parts of the silicon dioxide, 8-12 parts of the chain extender, 0.08-0.12 parts of the catalyst and 0.3-0.8 parts of the antioxidant.

[0069] Example 1

[0070] The thermoplastic silicone leather is gradually prepared according to the following operation steps:

[0071] (1) preparing thermoplastic silicone particles

[0072] The following components are measured by mass fraction as the raw materials for preparing the thermoplastic silicone particles:

[0073] 50 parts of methyl vinyl silicone rubber (the mass fraction of vinyl in the methyl vinyl silicone rubber is 0.16% of the total mass fraction, and the molecular weight of the methyl vinyl silicone rubber is about 560,000); 50 parts of TPU resin (the hardness of the TPU resin is 70A, and the melt index is 7g / 10min); 1 part of hydrogen-containing silicone oil (the amount of hydrogen-containing silicone oil is 0.36%); 1 part of chloroplatinic acid-isopropanol catalyst; 0.5 parts of anti-ultraviolet agent UV-P; and 0.5 parts of antioxidant 1010.

[0074] The methyl vinyl silicone rubber and the hydrogen-containing silicone oil are mixed uniformly in a banbury mixer to obtain intermediate material 1; the TPU resin, the anti-ultraviolet agent, and the antioxidant are blended at room temperature, and then dried to obtain intermediate material 2; the obtained intermediate material 1 and the intermediate material 2 are placed in a double-screw extruder together, and blended at 180°C; then the chloroplatinic acid-isopropanol catalyst is added, and the mixture is uniformly mixed at 180°C; and then the mixture is cut and cooled to obtain thermoplastic silicone particles; the SEM image of the obtained thermoplastic silicone particles is shown in FIG. 1. Figure 1 As can be seen from FIG. 1, the silicone rubber particles are dispersed in the thermoplastic resin. Figure 1

[0075] (2) Preparation of modified PUR glue

[0076] The following components are measured by mass fraction as raw materials for preparing the modified PUR glue:

[0077] 25 parts of polybutylene adipate; 25 parts of triphenylmethane triisocyanate; 15 parts of hydroxypropyl-terminated polydimethylsiloxane; 10 parts of 1,4-butanediol; 25 parts of silicon dioxide; 0.5 parts of antioxidant 1010; and 0.1 parts of stannous octoate.

[0078] The polybutylene adipate and the hydroxypropyl-terminated polydimethylsiloxane are added, and stirred at 50-60°C under vacuum conditions of 0.03-0.05 MPa for 0.5-1 h; the isocyanate (triphenylmethane triisocyanate) is added, and contacted and reacted at 50-60°C under an inert gas atmosphere for 1 h; then the chain extender (1,4-butanediol) is added, and reacted at 30-60°C for 1 h; then the temperature is increased to 150°C, the antioxidant (antioxidant 1010), the filler (silicon dioxide), and the catalyst (stannous octoate) are added and stirred uniformly; the mixture is mixed by a double-screw extruder, and then extruded and vacuum-sealed packaged.

[0079] (3) Preparation of thermoplastic silicone leather

[0080] In the first step, the microfiber cloth is unwound from a winding machine, cleaned, dried, and ironed flat.

[0081] Figure 2 ​Second step, melt plasticize the thermoplastic silicone particles in step (1) into the first extruder, melt plasticize the modified PUR glue in step (2) into the second extruder, the temperature of the first extruder is 180℃, the temperature of the second extruder is 150℃, the temperature of the extruder die is 180℃. The materials of the first extruder and the second extruder pass through the casting machine at the same time to form a composite film, and the overall thickness of the composite film is adjusted to 0.3mm, wherein the thickness of the leather surface layer is 0.2mm and the thickness of the hot melt adhesive layer is 0.1mm. The AFM diagram of the obtained composite film is shown in Figure 2 It can be seen that the surface of the cast leather surface layer has small protrusions. Figure 2 It can be seen that the surface of the cast leather surface layer has small protrusions.

[0082] (3) At 10cm below the die outlet, the base cloth is introduced from the side close to the modified PUR glue film, and the base cloth passes through the gap between the two rollers at the same time as the composite film, and is pressed to form the thermoplastic silicone leather under the pressure of the two rollers. Then the leather continues to pass through a 20m long oven with a temperature of 50℃, so that the reactive hot melt adhesive completes the curing and crosslinking in the oven.

[0083] Example 2

[0084] The difference between this embodiment and example 1 is that (1) the raw materials for preparing the thermoplastic silicone particles are different; (2) the raw materials for preparing the modified PUR glue are different.

[0085] Specifically,

[0086] (1) Raw material components of the thermoplastic silicone particles:

[0087] 40 parts of methyl vinyl silicone rubber (the mass fraction of vinyl in the methyl vinyl silicone rubber is 0.16% of the total mass fraction, and the molecular weight of the methyl vinyl silicone rubber is about 560,000); 60 parts of TPU resin (the hardness of the TPU resin is 70A, and the melt index is 7g / 10min); 1 part of hydrogen-containing silicone oil (the amount of hydrogen-containing silicone oil is 0.36%); 0.8 parts of chloroplatinic acid-tetramethyl divinyl disiloxane catalyst; 1 part of ultraviolet resistant agent UV-P; 1 part of antioxidant 1010.

[0088] (2) Raw material components of the modified PUR glue:

[0089] 30 parts of polybutylene adipate; 30 parts of triphenylmethane triisocyanate; 12 parts of hydroxypropyl-terminated polydimethylsiloxane; 8 parts of 1,6-hexanediol; 20 parts of silicon dioxide; 0.4 parts of antioxidant 1010; 0.1 parts of stannous octoate.

[0090] Example 3

[0091] The difference between the present embodiment and embodiment 1 is that (1) the raw material of the thermoplastic silicone particle is different; and (2) the raw material of the modified PUR glue is different.

[0092] Specifically,

[0093] (1) Raw material components of the thermoplastic silicone particle:

[0094] 35 parts of methyl vinyl silicone rubber (the mass fraction of vinyl in the methyl vinyl silicone rubber is 0.16% of the total mass fraction, and the molecular weight of the methyl vinyl silicone rubber is about 560,000); 65 parts of TPU resin (the hardness of the TPU resin is 70A, and the melt index is 7 g / 10 min); 1.5 parts of hydrogen-containing silicone oil (the amount of hydrogen-containing silicone oil is 0.36%); 1 part of chloroplatinic acid-isopropanol catalyst; 1 part of ultraviolet resistant agent UV-P; and 1 part of antioxidant 1010.

[0095] (2) Raw material components of the modified PUR glue:

[0096] 25 parts of polybutylene adipate; 25 parts of triphenylmethane triisocyanate; 20 parts of hydroxypropyl-terminated polydimethylsiloxane; 10 parts of 1,4-butanediol; 20 parts of silicon dioxide; 0.8 parts of antioxidant 1010; and 0.1 parts of stannous octoate.

[0097] Embodiment 4

[0098] The difference between the present embodiment and embodiment 1 is that the base fabric is different.

[0099] The base fabric selected in the present embodiment is Lycra cotton.

[0100] Embodiment 5

[0101] The difference between the present embodiment and embodiment 2 is that the base fabric is different.

[0102] The base fabric selected in the present embodiment is Lycra cotton.

[0103] Embodiment 6

[0104] The difference between the present embodiment and embodiment 3 is that the base fabric is different.

[0105] The base fabric selected in the present embodiment is Lycra cotton.

[0106] Test example

[0107] The thermoplastic silicone leather prepared in embodiments 1-6 is used as a sample to perform a test determination. The determination results are shown in Table 1.

[0108]

[0109]

[0110] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A thermoplastic silicone synthetic leather, characterized by, From bottom to top, sequentially attached are: Base cloth layer; Hot melt adhesive layer, raw material is modified PUR glue; the modified PUR glue is aliphatic polyol, isocyanate, silicon-containing polyol, silicon dioxide, chain extender, catalyst, which is obtained by blending and extrusion; Leather surface layer, raw material is thermoplastic organic silicon; the preparation method of thermoplastic organic silicon comprises the following steps: (A1) blending thermoplastic resin, silicone rubber and crosslinking agent to form a first blend; (A2) the first blend is added from the front end of the extruder, the catalyst is added from the middle end of the extruder, and the additive is added from the rear end of the extruder, and the thermoplastic organic silicon is obtained by extrusion; The aliphatic polyol is polybutylene adipate; the silicon-containing polyol is hydroxypropyl-terminated polydimethylsiloxane; the isocyanate includes at least one of triphenylmethane triisocyanate, diphenylmethane diisocyanate and polyhexamethylene diisocyanate; The thermoplastic resin is TPU resin; the silicone rubber contains vinyl units in the molecule, and the mass fraction of the vinyl units is 0.08-0.16%, and the molecular weight of the silicone rubber is 400,000-900,000.

2. The thermoplastic silicone synthetic leather according to claim 1, characterized by, The material of the base cloth layer includes at least one of lycra cotton, non-woven fabric, microfiber fabric, suede and suede.

3. The thermoplastic silicone synthetic leather according to claim 1, characterized by, The components of the thermoplastic organic silicon include at least one of features (1) to (4): (1) The crosslinking agent uses hydrogen-containing silicone oil with a hydrogen content of 0.5-1.7%, and the viscosity of the hydrogen-containing silicone oil at 25°C is 2-500 mPa·s; (2) The catalyst is a platinum catalyst, which includes at least one of chloroplatinic acid-isopropyl alcohol, chloroplatinic acid-tetramethyl divinyl disiloxane and chloroplatinic acid-diethyl phthalate; (3) The additive includes an ultraviolet resistant agent, which includes at least one of benzoic acid ultraviolet resistant agent, xylene ketone ultraviolet resistant agent and benzotriazole ultraviolet resistant agent; (4) The additive includes an antioxidant, which includes at least one of tetra[methylene-3,3',5-(di-tert-butyl-4-hydroxy-phenyl) propionate] pentaerythritol ester, N,N'-bis[[3-(3,5)-di-tert-butyl-4-hydroxyphenyl] propionyl] ethylenediamine, tris[2,4-di-tert-butylphenyl] phosphite and dipentaerythritol stearate.

4. The thermoplastic silicone synthetic leather according to claim 3, characterized by, The components of the raw material of the thermoplastic organic silicon include, by weight fraction, 50-80 parts of thermoplastic resin, 20-50 parts of silicone rubber, 0.5-2 parts of crosslinking agent, 0.1-1 part of catalyst and additive; the additive includes 0.5-1.5 parts of ultraviolet resistant agent and 0.5-1.5 parts of antioxidant; And / or, in the finished product of the thermoplastic organic silicon, the silicone rubber is uniformly distributed in the form of particles in the thermoplastic resin, and the particle diameter of the silicone rubber is 2-20 μm.

5. A method for producing the thermoplastic silicone synthetic leather according to claim 1 or 2, characterized by, The preparation method comprises the following steps: The modified PUR glue and the thermoplastic organic silicon are respectively added to the extruder for melting and plasticizing, and then the composite film is formed by simultaneous casting, and the base cloth is introduced at the outlet of the casting film; The base cloth is introduced to the side close to the modified PUR glue.

6. The method for producing a thermoplastic silicone synthetic leather according to claim 5, characterized by, The preparation method includes at least one of features (1) to (3): (1) The thickness of the hot melt adhesive layer is 0.05-0.2 mm, and the extrusion temperature is 130-160°C; (2) The thickness of the leather surface layer is 0.1-3mm, and the extrusion temperature is 150-180℃; (3) The cast extrusion film is formed, and the bonding pressure is 1-3MPa.

7. The method for producing a thermoplastic silicone synthetic leather according to claim 5, characterized by, The preparation method of the modified PUR glue comprises the following steps: (B1) uniformly blending aliphatic polyol, isocyanate and silicon-containing polyol to obtain a first blend; adding a catalyst, an antioxidant, a chain extender and silicon dioxide to the first blend to obtain a second blend; (B2) adding the second blend into an extruder, and then performing negative pressure treatment to obtain the modified PUR glue.

8. The production method of the thermoplastic silicone synthetic leather according to claim 7, characterized by, The components of the modified PUR glue comprise at least one of features (1)-(3): (1) The chain extender comprises at least one of 1,6-hexanediol, methylpropanediol and 1,4-butanediol; (2) The catalyst comprises at least one of dibutyltin dilaurate, stannous octoate, dibutylene acetate, triethylenediamine and bismorpholinyl diethyl ether; (3) The antioxidant comprises at least one of 2,6-tert-butyl-4-methylphenol and tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester.

9. The method for producing a thermoplastic silicone synthetic leather according to claim 8, characterized by: The components of the modified PUR glue comprise, by weight fraction, 15-40 parts of aliphatic polyol, 10-25 parts of silicon-containing polyol, 20-30 parts of isocyanate, 20-30 parts of silicon dioxide, 8-12 parts of chain extender, 0.08-0.12 parts of catalyst and 0.3-0.8 parts of antioxidant.

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