Special black superfine fiber polyurethane automotive leather

Abstract

The application discloses special black superfine fiber polyurethane vehicle leather and relates to the technical field of polyurethane artificial leather.The special black superfine fiber polyurethane vehicle leather comprises a superfine fiber base cloth, a reinforced resin layer and a special black polyurethane surface layer; the special black polyurethane surface layer comprises 42-56 parts of polycarbonate diol, 18-22 parts of polyoxytetramethylene glycol, 4-10 parts of diphenyl methane diisocyanate, 3-7 parts of a chain extender, 2-4 parts of trimethylolpropane, 0.5-2 parts of a foaming agent, 0.3-0.8 parts of carbon black and 0.01-0.5 parts of a catalyst; the reinforced resin layer comprises 1.5-1.8 parts of X(OH)3OSi(CH3) a (OCH3) 2‑a R, 50-80 parts of polyurethane acrylate, 10-25 parts of a diluent and 1-3 parts of a photoinitiator.The application has the effect of significantly improving structural strength to avoid the influence of punching on service life.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of polyurethane artificial leather, in particular to a special black superfine fiber polyurethane automotive leather. BACKGROUND

[0002] At present, with the continuous improvement of people's living standards, cars have gradually become people's means of transportation. The real leather required on the car seat has gradually been partially or completely replaced by synthetic leather.

[0003] A kind of breathable silicone leather for automobile cushion and its preparation method are disclosed in Chinese patent CN115961481A, the breathable silicone leather for automobile cushion includes base cloth, and further includes breathable surface layer coated on the surface of base cloth, the breathable surface layer includes the following raw materials by mass percentage: silicone gel 60-80%, silk fibroin aqueous solution 15-20%, polyurethane emulsion 5-10%, hardener 1-5%, penetrant 1-5%.

[0004] However, although the breathable silicone leather for automobile cushion uses silk fibroin aqueous solution and polyurethane emulsion at the same time to achieve the purpose of increasing air permeability, in the seat ventilation structure, the cushion still needs to be punched to form a ventilation structure, which leads to the problem of wrinkles and collapse of the breathable silicone leather for automobile cushion due to insufficient punching strength, which needs to be improved. SUMMARY

[0005] Therefore, the purpose of the application is to provide a special black superfine fiber polyurethane automotive leather to significantly improve the structural strength to avoid the impact of punching on service life. The specific scheme is as follows:

[0006] A special black superfine fiber polyurethane automotive leather includes superfine fiber base cloth, reinforced resin layer and special black polyurethane surface layer; the special black polyurethane surface layer includes 42-56 parts by weight of polycarbonate diol, 18-22 parts by weight of polyoxytetramethylene glycol, 4-10 parts by weight of diphenylmethane diisocyanate, 3-7 parts by weight of chain extender, 2-4 parts by weight of trimethylolpropane, 0.5-2 parts by weight of foaming agent, 0.3-0.8 parts by weight of carbon black and 0.01-0.5 parts by weight of catalyst; the reinforced resin layer includes 1.5-1.8 parts by weight of X(OH)3OSi(CH3) a (OCH3) 2-a R, 50-80 parts by weight of polyurethane acrylate, 10-25 parts by weight of diluent and 1-3 parts by weight of photoinitiator; wherein X is nano-SiO2, R is

[0007] Preferably, the chain extender is ethylene glycol, 1,4-butanediol, 1,6-hexanediol, ethylenediamine or hexanediamine, the foaming agent is AC foaming agent, and the catalyst is bismuth neodecanoate or bismuth isooctanoate.

[0008] Preferably, the diluent is isobornyl acrylate.

[0009] Preferably, the photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphorus oxychloride.

[0010] Preferably, the thickness of the microfiber base fabric is 0.5-1.2 mm, the thickness of the reinforcing resin layer is 0.3-0.8 mm, and the thickness of the extra-black polyurethane surface layer is 1.2-3.2 mm.

[0011] Preferably, the reinforcing resin is coated onto a microfiber base fabric, and then a black polyurethane surface layer is applied over the reinforcing resin, followed by UV cross-linking and curing to form a reinforcing resin layer.

[0012] Preferably, the method for preparing the reinforcing resin includes X(OH)3OSi(CH3) a (OCH3) 2-a R preparation section and mixing preparation section; X(OH)3OSi(CH3) a (OCH3) 2-a The preparation of R involved mixing nano-sized SiO2 with 3-(trimethoxysilyl)methacrylate or propyl methacrylate-trimethoxysilane in an ethanol solution at a weight ratio of 1.5:0.18-0.34, and stirring the mixture at a controlled temperature of 50°C for 3 hours. The resulting product was then dried and ground to obtain X(OH)3OSi(CH3). a (OCH3) 2-a R particles; the mixing preparation section uses 1.5-1.8 parts by weight of X(OH)3OSi(CH3). a (OCH3) 2-a R, 50-80 parts of polyurethane acrylate and 10-25 parts of diluent are mixed evenly, and then 1-3 parts of photoinitiator are added and mixed to obtain reinforced resin.

[0013] Preferably, the coating of the reinforcing resin is uniformly applied to the upper side of the roller-driven microfiber base fabric; the covering of the black polyurethane surface layer is carried out 10 seconds after the formation of the reinforcing resin, and the ultraviolet crosslinking curing is carried out by ultraviolet irradiation within 5 seconds after the completion of the black polyurethane surface layer covering, and the ultraviolet irradiation passes through the microfiber base fabric from bottom to top.

[0014] Preferably, the ultraviolet irradiation time is 0.5-2 min; the wavelength of the ultraviolet light is 340-400 nm.

[0015] Preferably: the preparation of the special black polyurethane surface layer comprises the following steps: step 1, stirring and mixing 42-56 parts by weight of polycarbonate diol, 18-22 parts by weight of polyoxytetramethylene glycol, 4-10 parts by weight of diphenyl methane diisocyanate and 0.01-0.5 parts by weight of catalyst, and controlling the stirring temperature to be 80-90℃, and the stirring time to be 1-2h; step 2, stirring and mixing 3-7 parts by weight of chain extender and 2-4 parts by weight of trimethylolpropane, and controlling the stirring temperature to be 60-70℃, and the stirring time to be 1-2h; step 3, adding 0.5-2 parts by weight of foaming agent and 0.3-0.8 parts by weight of carbon black, obtaining a foaming slurry in water as a solvent, and coating to obtain a special black polyurethane material for use as a special black polyurethane surface layer.

[0016] From the above scheme, it can be known that the present application provides a special black ultra-fine fiber polyurethane automotive leather, which has the following beneficial effects:

[0017] 1. By optimizing the composition in the preparation of the special black polyurethane surface layer, the carbon black realizes dyeing while cooperating with the foaming agent and trimethylolpropane to realize the structure ventilation performance of the special black polyurethane surface layer, and provides certain structural strength when punching to form a ventilation structure, thereby avoiding the effect of wrinkles collapse leading to shortening of service life;

[0018] 2. By using the ultra-fine fiber base cloth, the purpose of controlling the overall thickness of the special black ultra-fine fiber polyurethane automotive leather is achieved, and a stable structure auxiliary anti-deformation force is provided, thereby improving the use effect of the special black ultra-fine fiber polyurethane automotive leather;

[0019] 3. By setting the reinforcing resin layer between the ultra-fine fiber base cloth and the special black polyurethane surface layer, the reinforcing resin layer is cured in the process of ultraviolet irradiation, and forms a stable connection structure with the ultra-fine fiber base cloth and the special black polyurethane surface layer, and the formed structure has high stability, high hardness and significantly improved mechanical properties;

[0020] 4. By stirring and treating the nanoscale SiO2 and 3-(trimethoxysilyl) methyl acrylate or methyl methacrylate propyl trimethoxysilane in an ethanol solution, the 3-(trimethoxysilyl) methyl acrylate or methyl methacrylate propyl trimethoxysilane is hydrolyzed to form a silicon hydroxyl group suitable for forming a covalent condensed network structure with the surface of the nanoscale SiO2, so as to significantly improve the mechanical properties, so that the X(OH)3OSi(CH3) a (OCH3) 2-aAfter being stirred with polyurethane acrylate and diluent, R particles form a stable and dispersed mixed solution. This facilitates the formation of a reinforcing resin layer that stably connects the microfiber base fabric and the ultra-black polyurethane surface layer after the addition of a photoinitiator and ultraviolet irradiation. This also enables the ultra-black microfiber polyurethane automotive leather to improve structural strength and prevent perforation from affecting its service life. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the ultra-black microfiber polyurethane automotive leather disclosed in this application.

[0023] Explanation of reference numerals in the attached drawings: 1. Microfiber base fabric; 2. Reinforcing resin layer; 3. Extra black polyurethane surface layer. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The following will provide a detailed description of the extra-black microfiber polyurethane automotive leather of this application.

[0026] like Figure 1 As shown, a type of ultra-black microfiber polyurethane automotive leather includes a microfiber base fabric 1, a reinforcing resin layer 2, and an ultra-black polyurethane surface layer 3. The thickness of the microfiber base fabric 1 is 0.5-1.2 mm, the thickness of the reinforcing resin layer 2 is 0.3-0.8 mm, and the thickness of the ultra-black polyurethane surface layer 3 is 1.2-3.2 mm. Therefore, this ultra-black microfiber polyurethane automotive leather achieves the goal of controlling the overall thickness of the leather by using the microfiber base fabric 1, and provides stable structural auxiliary deformation resistance, thereby improving the performance of the ultra-black microfiber polyurethane automotive leather.

[0027] It needs to be mentioned that the special black polyurethane surface layer 3 includes 42-56 parts by weight of polycarbonate diol, 18-22 parts of polyoxytetramethylene glycol, 4-10 parts of diphenyl methane diisocyanate, 3-7 parts of chain extender, 2-4 parts of trimethylolpropane, 0.5-2 parts of foaming agent, 0.3-0.8 parts of carbon black and 0.01-0.5 parts of catalyst.

[0028] The chain extender is ethylene glycol, 1,4-butanediol, 1,6-hexanediol, ethylenediamine or hexamethylenediamine, the foaming agent is AC foaming agent, and the catalyst is bismuth neodecanoate or bismuth iso-octoate.

[0029] For the preparation method of the special black superfine fiber polyurethane automotive leather, the special black polyurethane surface layer 3 is first prepared, and the preparation of the special black polyurethane surface layer 3 includes steps 1, stirring and mixing 42-56 parts by weight of polycarbonate diol, 18-22 parts of polyoxytetramethylene glycol, 4-10 parts of diphenyl methane diisocyanate and 0.01-0.5 parts of catalyst, and controlling the stirring temperature to be 80-90℃ and the stirring time to be 1-2h; step 2, stirring and mixing 3-7 parts by weight of chain extender and 2-4 parts of trimethylolpropane, and controlling the stirring temperature to be 60-70℃ and the stirring time to be 1-2h; step 3, adding 0.5-2 parts by weight of foaming agent and 0.3-0.8 parts of carbon black, obtaining foaming slurry in water as a solvent, and coating to obtain a special black polyurethane material for use as the special black polyurethane surface layer 3. Therefore, the special black polyurethane surface layer 3 realizes the effect of avoiding wrinkles collapse leading to shortening of service life by combining optimized composition ingredients in preparation, so that the carbon black realizes dyeing while realizing the structure ventilation performance of the special black polyurethane surface layer 3 in cooperation with the foaming agent and trimethylolpropane, and providing certain structural strength when being punched to form a ventilation structure.

[0030] It needs to be mentioned that the reinforcing resin layer 2 includes 50-80 parts by weight of polyurethane acrylate, 10-25 parts of diluent, 1.5-1.8 parts of X(OH)3OSi(CH3) a (OCH3) 2-a R and 1-3 parts of photoinitiator.

[0031] X is nano-sized SiO2, and R is The diluent is isobornyl acrylate. And the photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide.

[0032] In the preparation of the special black superfine fiber polyurethane automotive leather, the preparation method is specifically to coat the reinforcing resin on the superfine fiber base cloth 1, and then cover the special black polyurethane surface layer 3 on the reinforcing resin, and then use ultraviolet cross-linking to form the reinforcing resin layer 2.

[0033] Meanwhile, the method for preparing the reinforcing resin comprises X(OH)3OSi(CH3) a (OCH3) 2-a The R preparation part and the mixing preparation part.

[0034] wherein, X(OH)3OSi(CH3) a (OCH3) 2-a The R preparation part adopts the method of mixing 1.5 parts of nano-SiO2 and 0.18-0.34 parts of 3-(trimethoxysilyl) methyl propyl methacrylate or methyl propyl methacrylate trimethoxysilane in ethanol solution, stirring and treating, and controlling the stirring temperature to be 50℃ and the stirring time to be 3h, and then drying and grinding to obtain X(OH)3OSi(CH3) a (OCH3) 2-a R particle. The mixing preparation part adopts the method of stirring uniformly 1.5-1.8 parts of X(OH)3OSi(CH3) a (OCH3) 2-a R, 50-80 parts of polyurethane acrylate and 10-25 parts of diluent, and then adding 1-3 parts of photoinitiator to stir and mix, to obtain the reinforcing resin. The coating of the reinforcing resin is uniformly coated on the upper side of the roller-driven superfine fiber base cloth 1. The covering of the special black polyurethane surface layer 3 is performed 10 minutes after the formation of the reinforcing resin. The ultraviolet cross-linking curing is performed within 5s after the completion of the covering of the special black polyurethane surface layer 3, and the ultraviolet irradiation is performed from bottom to top through the superfine fiber base cloth 1.

[0035] When the ultraviolet irradiation is performed to cure the reinforcing resin and form the reinforcing resin layer 2, the time of the ultraviolet irradiation is controlled to be 0.5-2min; the wavelength of the ultraviolet is 340-400nm.

[0036] Example one

[0037] As Figure 1 shown, a special black superfine fiber polyurethane automotive leather comprises a superfine fiber base cloth 1, a reinforcing resin layer 2 and a special black polyurethane surface layer 3. The thickness of the superfine fiber base cloth 1 is 0.5mm, the thickness of the reinforcing resin layer 2 is 0.3mm, and the thickness of the special black polyurethane surface layer 3 is 1.2mm. Therefore, the special black superfine fiber polyurethane automotive leather realizes the purpose of controlling the overall thickness of the special black superfine fiber polyurethane automotive leather by adopting the superfine fiber base cloth 1, and provides a stable structure to assist the deformation resistance, thereby improving the use effect of the special black superfine fiber polyurethane automotive leather.

[0038] It needs to be mentioned that the special black polyurethane surface layer 3 includes 42 parts by weight of polycarbonate diol, 18 parts of polyoxytetramethylene glycol, 4 parts of diphenyl methane diisocyanate, 3 parts of ethylene glycol, 2 parts of trimethylolpropane, 0.5 parts of AC foaming agent, 0.3 parts of carbon black and 0.01 parts of bismuth neodecanoate.

[0039] For the preparation method of the special black superfine fiber polyurethane automotive leather, the special black polyurethane surface layer 3 is prepared first, and the preparation of the special black polyurethane surface layer 3 includes step 1, stirring and mixing 42 parts by weight of polycarbonate diol, 18 parts of polyoxytetramethylene glycol, 4 parts of diphenyl methane diisocyanate and 0.01 parts of bismuth neodecanoate, and the stirring temperature is controlled at 80℃, and the stirring time is 1h; step 2, stirring and mixing 3 parts by weight of ethylene glycol and 2 parts of trimethylolpropane, and the stirring temperature is controlled at 60℃, and the stirring time is 1h; step 3, adding 0.5 parts by weight of AC foaming agent and 0.3 parts of carbon black, obtaining a foaming slurry in water as a solvent, and coating to obtain a special black polyurethane material for use as a special black polyurethane surface layer 3. Therefore, the special black polyurethane surface layer 3 combines the optimized composition ingredients in the preparation, so that the carbon black realizes dyeing while realizing the structure ventilation performance of the special black polyurethane surface layer 3 in cooperation with the foaming agent and trimethylolpropane, and provides a certain structural strength when punching to form a ventilation structure, thereby realizing the effect of avoiding the shortening of service life caused by wrinkle collapse.

[0040] It should be noted that the reinforcing resin layer 2 includes 50 parts by weight of polyurethane acrylate, 1.5 parts of X(OH)3OSi(CH3) a (OCH3) 2-a R, 10 parts of isobornyl acrylate and 1 part of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide.

[0041] Wherein, X is nano-SiO2, R is

[0042] In the preparation of the special black superfine fiber polyurethane automotive leather, the preparation method is to coat the reinforcing resin on the superfine fiber base cloth 1, and then cover the special black polyurethane surface layer 3 on the reinforcing resin, and then use ultraviolet cross-linking to form the reinforcing resin layer 2.

[0043] At the same time, the preparation method of the reinforcing resin includes X(OH)3OSi(CH3) a (OCH3) 2-a R preparation part and mixing preparation part.

[0044] Wherein, X(OH)3OSi(CH3) a (OCH3) 2-aThe preparation part adopts mixing 1.5 parts by weight of nano-SiO2 and 0.18 parts by weight of 3-(trimethoxysilyl) methyl propyl methacrylate or methyl propyl methacrylate trimethoxysilane in an ethanol solution, stirring treatment, and controlling the stirring temperature to be 50°C and the stirring time to be 3h, and then obtaining X(OH)3OSi(CH3) a (OCH3) 2-a The preparation part adopts mixing 1.5 parts by weight of nano-SiO2 and 0.18 parts by weight of 3-(trimethoxysilyl) methyl propyl methacrylate or methyl propyl methacrylate trimethoxysilane in an ethanol solution, stirring treatment, and controlling the stirring temperature to be 50°C and the stirring time to be 3h, and then obtaining X(OH)3OSi(CH3) a (OCH3) 2-a The preparation part adopts mixing 1.5 parts by weight of nano-SiO2 and 0.18 parts by weight of 3-(trimethoxysilyl) methyl propyl methacrylate or methyl propyl methacrylate trimethoxysilane in an ethanol solution, stirring treatment, and controlling the stirring temperature to be 50°C and the stirring time to be 3h, and then obtaining X(OH)3OSi(CH3)

[0045] The preparation part adopts mixing 1.5 parts by weight of nano-SiO2 and 0.18 parts by weight of 3-(trimethoxysilyl) methyl propyl methacrylate or methyl propyl methacrylate trimethoxysilane in an ethanol solution, stirring treatment, and controlling the stirring temperature to be 50°C and the stirring time to be 3h, and then obtaining X(OH)3OSi(CH3)

[0046] Example Two

[0047] As Figure 1 shown in the figure, a special black super-fine fiber polyurethane automotive leather includes a super-fine fiber base cloth 1, a reinforced resin layer 2, and a special black polyurethane surface layer 3. The thickness of the super-fine fiber base cloth 1 is 0.8mm, the thickness of the reinforced resin layer 2 is 0.5mm, and the thickness of the special black polyurethane surface layer 3 is 2mm. Therefore, the special black super-fine fiber polyurethane automotive leather realizes the purpose of controlling the overall thickness of the special black super-fine fiber polyurethane automotive leather by using the super-fine fiber base cloth 1, and provides a stable structure to assist the deformation resistance, thereby improving the use effect of the special black super-fine fiber polyurethane automotive leather.

[0048] It should be noted that the special black polyurethane surface layer 3 includes 48 parts by weight of polycarbonate diol, 20 parts by weight of polyoxytetramethylene glycol, 7 parts by weight of diphenyl methane diisocyanate, 5 parts by weight of 1,4-butanediol, 3 parts by weight of trimethylolpropane, 1.2 parts by weight of AC foaming agent, 0.6 parts by weight of carbon black, and 0.2 parts by weight of bismuth isooctoate.

[0049] The preparation method of the special black superfine fiber polyurethane automotive leather is as follows: first, a special black polyurethane surface layer 3 is prepared, and the preparation of the special black polyurethane surface layer 3 comprises the following steps: 1, stirring and mixing 48 parts of polycarbonate diol, 20 parts of polyoxytetramethylene glycol, 7 parts of diphenyl methane diisocyanate and 0.2 parts of bismuth isooctoate by weight, and controlling the stirring temperature to be 85℃ and the stirring time to be 1.5h; 2, stirring and mixing 5 parts of 1,4-butanediol and 3 parts of trimethylolpropane by weight, and controlling the stirring temperature to be 65℃ and the stirring time to be 1.5h; 3, adding 1.2 parts of AC foaming agent and 0.6 parts of carbon black by weight, obtaining a foaming slurry in water as a solvent, and coating to obtain a special black polyurethane material for use as the special black polyurethane surface layer 3. Therefore, the special black polyurethane surface layer 3 is prepared by combining the optimized composition in the preparation, so that the carbon black realizes dyeing while realizing the structure ventilation performance of the special black polyurethane surface layer 3 in cooperation with the foaming agent and trimethylolpropane, and provides a certain structural strength when being punched to form a ventilation structure, thereby realizing the effect of avoiding the shortening of service life caused by wrinkle collapse.

[0050] It should be noted that the reinforcing resin layer 2 comprises 65 parts of polyurethane acrylate, 1.6 parts of X(OH)3OSi(CH3) a (OCH3) 2-a R, 18 parts of isobornyl acrylate and 2 parts of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide.

[0051] Wherein, X is nano-SiO2, R is

[0052] In the preparation of the special black superfine fiber polyurethane automotive leather, the preparation method is to coat the reinforcing resin on the superfine fiber base cloth 1, and then cover the special black polyurethane surface layer 3 on the reinforcing resin, and then use ultraviolet cross-linking curing to form the reinforcing resin layer 2.

[0053] At the same time, the preparation method of the reinforcing resin comprises an X(OH)3OSi(CH3) a (OCH3) 2-a R preparation part and a mixing preparation part.

[0054] Wherein, the X(OH)3OSi(CH3) a (OCH3) 2-a R preparation part is to mix nano-SiO2 and 3-(trimethoxysilyl) methyl acrylate or methyl acrylate-based trimethoxysilane in an ethanol solution by weight ratio of 1.5:0.25, stirring and treating, and controlling the stirring temperature to be 50℃ and the stirring time to be 3h, and then drying and grinding to obtain X(OH)3OSi(CH3) a(OCH3) 2-a R particles. The mixing preparation part adopts 1.6 parts of X(OH)3OSi(CH3) a (OCH3) 2-a R, 65 parts of polyurethane acrylate and 18 parts of isobornyl acrylate are stirred uniformly, and then 2 parts of diphenyl-(2, 4, 6-trimethylbenzoyl) phosphine oxide is added to stir and mix, to obtain the reinforcing resin. The coating of the reinforcing resin is to uniformly coat the upper side of the roller-driven ultra-fine fiber base cloth 1. The covering of the special black polyurethane top layer 3 is to be performed 10 minutes after the formation of the reinforcing resin. The ultraviolet cross-linking curing is to be performed within 5 seconds after the completion of the covering of the special black polyurethane top layer 3, and the ultraviolet irradiation is to pass through the ultra-fine fiber base cloth 1 from bottom to top.

[0055] When the ultraviolet irradiation is performed to cure the reinforcing resin and form the reinforcing resin layer 2, the time of the ultraviolet irradiation is controlled to be 1 minute; the wavelength of the ultraviolet is 360 nm.

[0056] Example Three

[0057] As Figure 1 shown, a special black ultra-fine fiber polyurethane automotive leather includes an ultra-fine fiber base cloth 1, a reinforcing resin layer 2 and a special black polyurethane top layer 3. The thickness of the ultra-fine fiber base cloth 1 is 1.2 mm, the thickness of the reinforcing resin layer 2 is 0.8 mm, and the thickness of the special black polyurethane top layer 3 is 3.2 mm. Therefore, the special black ultra-fine fiber polyurethane automotive leather realizes the purpose of controlling the overall thickness of the special black ultra-fine fiber polyurethane automotive leather by using the ultra-fine fiber base cloth 1, and provides a stable structure to assist the deformation resistance, thereby improving the use effect of the special black ultra-fine fiber polyurethane automotive leather.

[0058] It should be noted that the special black polyurethane top layer 3 includes 56 parts of polycarbonate diol, 22 parts of polyoxytetramethylene glycol, 10 parts of diphenyl methane diisocyanate, 7 parts of ethylenediamine, 4 parts of trimethylolpropane, 2 parts of AC foaming agent, 0.8 parts of carbon black and 0.5 parts of bismuth neodecanoate.

[0059] The preparation method of the special black superfine fiber polyurethane automotive leather, first, the special black polyurethane surface layer 3 is prepared, and the preparation of the special black polyurethane surface layer 3 includes steps 1, stirring and mixing 56 parts by weight of polycarbonate diol, 22 parts by weight of polyoxytetramethylene glycol, 10 parts by weight of diphenyl methane diisocyanate and 0.5 parts by weight of bismuth neodecanoate, and the stirring temperature is controlled at 90 DEG C, and the stirring time is 2h; step 2, stirring and mixing 7 parts by weight of ethylenediamine and 4 parts by weight of trimethylolpropane, and the stirring temperature is controlled at 70 DEG C, and the stirring time is 2h; step 3, adding 2 parts by weight of foaming agent and 0.8 parts by weight of carbon black, and obtaining foaming slurry in water as solvent, and obtaining special black polyurethane material by coating to be used as special black polyurethane surface layer 3. Therefore, the special black polyurethane surface layer 3 is prepared by combining the optimized composition in the preparation, so that the carbon black realizes the dyeing while realizing the structure ventilation performance of the special black polyurethane surface layer 3 in cooperation with the AC foaming agent and trimethylolpropane, and provides certain structural strength when punching to form the ventilation structure, thereby realizing the effect of avoiding the shortening of service life caused by wrinkle collapse.

[0060] It should be noted that the reinforcing resin layer 2 includes 80 parts by weight of polyurethane acrylate, 1.8 parts by weight of X(OH)3OSi(CH3) a (OCH3) 2-a R, 25 parts of isobornyl acrylate and 3 parts of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide.

[0061] Wherein, X is nano-SiO2, R is

[0062] In the preparation of the special black superfine fiber polyurethane automotive leather, the preparation method is to coat the reinforcing resin on the superfine fiber base cloth 1, and then cover the special black polyurethane surface layer 3 on the reinforcing resin, and then use ultraviolet cross-linking curing to form the reinforcing resin layer 2.

[0063] At the same time, the preparation method of the reinforcing resin includes the preparation of X(OH)3OSi(CH3) a (OCH3) 2-a R part and mixing preparation part.

[0064] Wherein, X(OH)3OSi(CH3) a (OCH3) 2-a R part is to mix nano-SiO2 and 3-(trimethoxysilyl) methyl acrylate or methyl acrylate propyl trimethoxysilane in an ethanol solution with a weight ratio of 1.5:0.34, stirring and treating, and the stirring temperature is controlled at 50 DEG C, and the stirring time is 3h, and then X(OH)3OSi(CH3) a (OCH3)2-a R particles. The mixing preparation part adopts 1.8 parts of X(OH)3OSi(CH3) a (OCH3) 2-a R, 80 parts of polyurethane acrylate and 25 parts of isobornyl acrylate are stirred uniformly, and then 3 parts of diphenyl-(2, 4, 6-trimethylbenzoyl) phosphine oxide is added to stir and mix to obtain a reinforcing resin. The coating of the reinforcing resin is to uniformly coat the upper side of the roller-driven ultra-fine fiber base cloth 1. The covering of the special black polyurethane top layer 3 is to cover after the formation of the reinforcing resin. And the ultraviolet cross-linking curing is to perform ultraviolet irradiation within 5s after the completion of the covering of the special black polyurethane top layer 3, and to make the ultraviolet irradiation pass through the ultra-fine fiber base cloth 1 from bottom to top.

[0065] When the ultraviolet irradiation is performed to cure the reinforcing resin and form the reinforcing resin layer 2, the time of the ultraviolet irradiation is controlled to be 2min; the wavelength of the ultraviolet is 400nm.

[0066] Comparative Example One

[0067] The difference between Comparative Example One and Example Two is that there is no reinforcing resin layer in Comparative Example Two, and adhesive is used for bonding.

[0068] Comparative Example Two

[0069] Comparative Example Two is a breathable silicone leather for automobile cushion disclosed in CN115961481A.

[0070] Comparative Example Three

[0071] The difference between Comparative Example Three and Example Two is that the reinforcing resin layer 2 in Comparative Example Three uses nano-silicon dioxide instead of X(OH)3OSi(CH3) a (OCH3) 2-a R.

[0072] Performance tests are performed on Example One to Example Three and Comparative Example One to Comparative Example Three:

[0073] Specifically, the following tests and their test methods are included:

[0074] 1. Peel strength test:

[0075] The peel strength of the special black polyurethane top layer 3 is tested according to GB / T2791-1995.

[0076] 2. Mechanical property test:

[0077] The elongation at break is tested according to GB / T2567-2008;

[0078] The breaking strength was tested according to GB / T8949-2008.

[0079] Table 1 Performance test results

[0080] Peel strength (N / 3 cm) Elongation at break (%) Breaking strength (MPa) Example 1 62.43 411.59 18.32 Example 2 64.31 397.83 19.28 Example 3 64.58 386.6 19.75 Comparative Example 1 42.15 562.17 15.33 Comparative Example 2 48.36 62.11 33.6 Comparative Example 3 52.87 498.33 13.94

[0081] As can be seen from the table, the peel strength of the black super-fine fiber polyurethane automotive leather of the present application examples one to three is obviously superior to that of the corresponding products of the comparative examples one to three, so as to achieve the purpose of prolonging the service life and preventing the wrinkle collapse problem, and at the same time, the structural strength of the black super-fine fiber polyurethane automotive leather is improved by the reinforcing resin layer 2, and the air permeability effect is achieved by the black polyurethane surface layer 3. At the same time, the black super-fine fiber polyurethane automotive leather of the present application examples one to three has excellent and suitable breaking elongation and breaking strength, which realizes the use comfort and significantly improves the mechanical strength to prolong the service life, and further makes the black super-fine fiber polyurethane automotive leather have broad market prospects.

[0082] In summary, the present application provides a black super-fine fiber polyurethane automotive leather, which is provided with a reinforcing resin layer 2 between the super-fine fiber base cloth 1 and the black polyurethane surface layer 3, so that the reinforcing resin layer 2 is cured in the process of ultraviolet irradiation, and forms a stable connection structure with the super-fine fiber base cloth 1 and the black polyurethane surface layer 3, and the formed structure has high stability, high hardness and significantly improved mechanical properties. At the same time, by stirring the nanoscale SiO2 and 3-(trimethoxysilyl) methyl acrylate or methyl acrylate-based trimethoxysilane in an ethanol solution, the 3-(trimethoxysilyl) methyl acrylate or methyl acrylate-based trimethoxysilane is hydrolyzed to form a silicon hydroxyl group suitable for forming a covalent condensed network structure with the surface of the nanoscale SiO2, so as to significantly improve the mechanical properties, so that the X(OH)3OSi(CH3) a (OCH3) 2-a After the R particles are stirred with the polyurethane acrylate and the diluent, a dispersion-stable mixed solution is formed, so as to form the reinforcing resin layer 2 which stably connects the super-fine fiber base cloth 1 and the black polyurethane surface layer 3 after adding the photoinitiator and ultraviolet irradiation, and the black super-fine fiber polyurethane automotive leather has the effect of improving the structural strength to avoid the influence of punching on the service life.

[0083] The use of "first", "second", "third", "fourth" etc. (if any) in this disclosure is only to distinguish similar objects, and does not necessarily indicate a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods or devices.

[0084] It should be noted that the description involving "first", "second" and the like in this application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features indicated, or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed in this application.

[0085] The principles and implementation modes of the present application are described by applying specific examples herein, and the above description of the embodiments is only for the purpose of helping to understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A type of ultra-black microfiber polyurethane automotive leather, characterized in that: The product comprises a microfiber base fabric, a reinforcing resin layer, and a dark black polyurethane surface layer. The dark black polyurethane surface layer comprises, by weight, 42-56 parts polycarbonate diol, 18-22 parts polyoxytetramethylene glycol, 4-10 parts diphenylmethane diisocyanate, 3-7 parts chain extender, 2-4 parts trimethylolpropane, 0.5-2 parts foaming agent, 0.3-0.8 parts carbon black, and 0.01-0.5 parts catalyst. The reinforcing resin layer comprises, by weight, 1.5-1.8 parts X(OH)3OSi(CH3). a (OCH3) 2-a R, 50-80 parts of polyurethane acrylate, 10-25 parts of diluent, and 1-3 parts of photoinitiator; wherein, X is nano-sized SiO2, and R is... The process involves coating a reinforcing resin onto a microfiber base fabric, then covering the reinforcing resin with a black polyurethane surface layer, followed by UV cross-linking and curing to form the reinforcing resin layer. The preparation method of the reinforcing resin includes X(OH)3OSi(CH3). a (OCH3) 2-a R preparation section and mixing preparation section; X(OH)3OSi(CH3) a (OCH3) 2-a The preparation of R involved mixing nano-sized SiO2 with 3-(trimethoxysilyl)methacrylate or propyl methacrylate-trimethoxysilane in an ethanol solution at a weight ratio of 1.5:0.18-0.34, and stirring the mixture at a controlled temperature of 50°C for 3 hours. The resulting product was then dried and ground to obtain X(OH)3OSi(CH3). a (OCH3) 2-a R particles; the mixing preparation section uses 1.5-1.8 parts by weight of X(OH)3OSi(CH3). a (OCH3) 2-a R, 50-80 parts of polyurethane acrylate and 10-25 parts of diluent are mixed evenly, and then 1-3 parts of photoinitiator are added and mixed to obtain reinforced resin.

2. The extra-black microfiber polyurethane automotive leather according to claim 1, characterized in that: The chain extender is ethylene glycol, 1,4-butanediol, 1,6-hexanediol, ethylenediamine, or hexanediamine; the foaming agent is AC foaming agent; and the catalyst is bismuth neodecanoate or bismuth isooctanoate.

3. The extra-black microfiber polyurethane automotive leather according to claim 1, characterized in that: The diluent is isobornyl acrylate.

4. The extra-black microfiber polyurethane automotive leather according to claim 1, characterized in that: The photoinitiator is diphenyl-(2,4,6-trimethylbenzoyl)phosphorus oxychloride.

5. The extra-black microfiber polyurethane automotive leather according to claim 1, characterized in that: The thickness of the microfiber base fabric is 0.5-1.2 mm, the thickness of the reinforcing resin layer is 0.3-0.8 mm, and the thickness of the extra-black polyurethane surface layer is 1.2-3.2 mm.

6. The extra-black microfiber polyurethane automotive leather according to claim 1, characterized in that: The coating of the reinforcing resin is uniformly applied to the upper side of the roller-driven microfiber base fabric; the covering of the black polyurethane surface layer is carried out after the formation of the reinforcing resin, and the ultraviolet crosslinking and curing is carried out by ultraviolet irradiation within 5 seconds after the black polyurethane surface layer is covered, and the ultraviolet irradiation passes through the microfiber base fabric from bottom to top.

7. The extra-black microfiber polyurethane automotive leather according to claim 6, characterized in that: The ultraviolet irradiation time is 0.5-2 minutes; the wavelength of the ultraviolet light is 340-400 nm.

8. The extra-black microfiber polyurethane automotive leather according to claim 1, characterized in that: The preparation of the special black polyurethane surface layer includes step 1, mixing 42-56 parts by weight of polycarbonate diol, 18-22 parts by weight of polyoxytetramethylene diol, 4-10 parts by weight of diphenylmethane diisocyanate and 0.01-0.5 parts by weight of catalyst, and controlling the stirring temperature at 80-90℃ for 1-2 hours; step 2, adding 3-7 parts by weight of chain extender and 2-4 parts by weight of trimethylolpropane and stirring, controlling the stirring temperature at 60-70℃ for 1-2 hours; step 3, adding 0.5-2 parts by weight of foaming agent and 0.3-0.8 parts by weight of carbon black, obtaining a foaming slurry in water as a solvent, and coating it to obtain a special black polyurethane material for use as a special black polyurethane surface layer.

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