Stain-resistant and scratch-resistant organic silicon leather and preparation method thereof

Abstract

The invention belongs to the technical field of leather, and particularly relates to anti-fouling and scratch-resistant organic silicon leather and a preparation method thereof.The anti-fouling and scratch-resistant organic silicon leather is of a layered structure and sequentially comprises an organic silicon coating, a surface layer, a middle layer and a bottom layer from top to bottom, the surface layer is coated with 100% of organic silicon materials, the middle layer is made of 100% of organic silicon bonding materials, and the bottom layer is made of organic silicon bonding materials. According to the scratch-resistant leather, organic silicon resin and nano silicon dioxide particles are introduced to serve as scratch-resistant filler, fluoride modified silane serves as an anti-fouling agent, and the organic silicon coating not only enhances the anti-fouling capacity of the leather, but also can effectively resist scratches and abrasion; the service life and the attractiveness of a leather product are greatly prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of leather, and in particular relates to anti-fouling and scratch-resistant organic silicon leather and a preparation method thereof. Background Art

[0002] With the widespread application of leather products in daily life, fashion accessories, home decoration and car interior, consumers have put forward higher and higher requirements for the durability, cleanability and comfort of leather products. Although traditional leather materials have natural and beautiful texture and feel, they often show weak resistance to external factors such as stains and scratches, which affects the service life and appearance of the product.

[0003] In order to overcome this problem, the industry has developed a variety of anti-fouling and scratch-resistant treatment technologies, among which polyurethane (PU) and acrylic resin coatings are widely used due to their good anti-fouling and scratch-resistant properties. However, these coating materials will inevitably face aging problems during long-term use. The aging coating not only greatly reduces the anti-fouling and scratch-resistant effects, but also affects the air permeability and flexibility of the leather, thereby reducing the comfort of wearing or using.

[0004] In addition, existing coating technologies often have difficulty finding a perfect balance between anti-fouling and scratch resistance and the original excellent properties of leather (such as breathability, feel, etc.). For example, in pursuit of the ultimate anti-fouling and scratch resistance effect, the coating is too thick, causing the leather to lose its original soft touch; while in order to maintain the breathability of the leather, the coating is too thin and cannot effectively resist stains and scratches. Summary of the invention

[0005] The invention uses organic silicon resin and nano filler and adds fluoride-modified silane to improve the durability, stain resistance and scratch resistance of the leather coating, while maintaining the flexibility and air permeability of the leather, thereby overcoming the defects of the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: a stain-resistant and scratch-resistant organic silicon leather, which is a layered structure, which comprises an organic silicon coating, a surface layer, an intermediate layer and a bottom layer from top to bottom, wherein the surface layer is coated with 100% organic silicon material, the intermediate layer is 100% organic silicon adhesive material, the bottom layer is a microfiber material, and the organic silicon coating comprises the following components:

[0007] 1): Silicone resin, including methyl polysiloxane and vinyl polysiloxane;

[0008] 2): Anti-scratch filler, including nano-silicon dioxide particles;

[0009] 3): Antifouling agent, including fluoride-modified silane;

[0010] 4); Catalyst, including platinum catalyst;

[0011] 5): Solvent, comprising a mixed solution of isopropanol and ethyl acetate.

[0012] Preferably, the method for preparing the organosilicon coating comprises the following steps:

[0013] 1): Mixing the silicone resin, the anti-scratch filler and the anti-fouling agent in proportion to form a uniform mixture;

[0014] 2): adding a catalyst to the mixture and stirring sufficiently to promote the cross-linking reaction;

[0015] 3): applying the mixture on the surface of the leather substrate to form a wet film;

[0016] 4): Curing the coated leather at 80°C to 120°C until a uniform silicone coating is formed.

[0017] Preferably, in the mixing step, the particle size of the anti-scratch filler is 10 to 50 nanometers to enhance the scratch resistance of the coating.

[0018] Preferably, the antifouling agent is added in an amount of 1% to 5% of the total weight of the coating to ensure that the coating has excellent antifouling properties.

[0019] Preferably, the coating has a self-cleaning function, and through the combination of surface nanostructures and low surface energy materials, a water drop rolling effect is achieved, thereby effectively removing surface dirt.

[0020] Preferably, the curing step is performed in an inert gas environment to prevent oxidation or aging of the coating during the curing process.

[0021] Preferably, the surface coating thickness of the leather is 5 to 20 microns to maintain the air permeability and softness of the leather.

[0022] Preferably, the substrate of the silicone coating is natural leather or synthetic leather, and the leather substrate is pretreated, and the pretreatment includes cleaning, drying and surface roughening to enhance the adhesion of the coating.

[0023] 1. Compared with the prior art, the beneficial effects of the present invention are: by introducing silicone resin, nano-silica particles as anti-scratch fillers and fluoride-modified silane as an anti-fouling agent, the silicone coating of the present invention not only enhances the anti-fouling ability of leather, but also effectively resists scratches and wear, greatly extending the service life and aesthetics of leather products.

[0024] 2. Compared with the prior art, the beneficial effects of the present invention are: by precisely controlling the thickness of the coating (5 to 20 microns) and using ultrafine fibers as the underlying material, the flexibility and breathability of the leather are ensured to be unaffected, thereby improving the comfort of wearing or using.

[0025] 3. Compared with the prior art, the beneficial effects of the present invention are: the combination of the nanostructure on the coating surface and the low surface energy material gives the leather a self-cleaning function, and water droplets form a rolling effect on the coating surface, which can easily take away the attached dirt, reducing the trouble of cleaning and maintenance, and improving the convenience and practicality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a first three-dimensional structural diagram of the present invention;

[0027] Figure 2 It is a second three-dimensional structural diagram of the present invention;

[0028] Figure 3 It is a third three-dimensional structural diagram of the present invention;

[0029] Figure 4 It is a cross-sectional structural diagram of the present invention.

[0030] In the figure: 1. Silicone coating; 2. Surface layer; 3. Middle layer; 4. Bottom layer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Please see attached Figure 1-4 , several embodiments provided by the present invention:

[0033] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a stain-resistant and scratch-resistant organic silicon leather, which is a layered structure, and is composed of an organic silicon coating 1, a surface layer 2, an intermediate layer 3 and a bottom layer 4 from top to bottom. The surface layer 2 is coated with 100% organic silicon material, and the intermediate layer 3 is 100% organic silicon adhesive material. The main function of this layer is to firmly bond the surface layer and the bottom layer together to ensure the integrity and stability of the leather. At the same time, the organic silicon adhesive material also has certain elasticity and toughness, which helps to improve the durability and comfort of the leather. The bottom layer 4 is a superfine fiber material. The superfine fiber is a synthetic fiber with a similar feel and appearance to genuine leather, and has good wear resistance and tear resistance. As a bottom material, it can provide stable support and strength, and also has certain air permeability. In addition, the cost of the superfine fiber is relatively low, and it is easy to process and mass produce. The organic silicon coating 1 includes the following components:

[0034] 1): Silicone resin, including methyl polysiloxane and vinyl polysiloxane;

[0035] 2): Anti-scratch filler, including nano-silicon dioxide particles;

[0036] 3): Antifouling agent, including fluoride-modified silane;

[0037] 4); Catalyst, including platinum catalyst;

[0038] 5): Solvent, comprising a mixed solution of isopropanol and ethyl acetate.

[0039] Furthermore, the preparation method of the organosilicon coating comprises the following steps:

[0040] 1): Mixing the silicone resin, the anti-scratch filler and the anti-fouling agent in proportion to form a uniform mixture;

[0041] 2): Add a catalyst to the mixture and stir thoroughly to promote the cross-linking reaction;

[0042] 3): Apply the mixture on the surface of the leather substrate to form a wet film;

[0043] 4): Curing the coated leather at 80°C to 120°C until a uniform silicone coating is formed.

[0044] Furthermore, in the mixing step, the particle size of the anti-scratch filler is 10 to 50 nanometers to enhance the scratch resistance of the coating. By specifying the particle size of the anti-scratch filler to be 10 to 50 nanometers, this tiny-scale filler can form a strong and uniform network structure in the coating, significantly improving the hardness and wear resistance of the coating, thereby effectively resisting scratches and wear and extending the service life of the leather.

[0045] Furthermore, the anti-fouling agent is added in an amount of 1% to 5% of the total weight of the coating to ensure that the coating has excellent anti-fouling properties. Accurately controlling the anti-fouling agent addition ratio between 1% and 5% of the total weight of the coating can ensure that a thin anti-fouling layer is formed on the surface of the coating, which does not affect the air permeability and feel of the leather, and can effectively prevent the penetration and adhesion of stains, thereby improving the cleanliness and aesthetics of the leather.

[0046] Furthermore, the coating has a self-cleaning function. Through the combination of surface nanostructure and low surface energy materials, a water drop rolling effect is achieved, thereby effectively removing surface dirt. The addition ratio of the anti-fouling agent is precisely controlled between 1% and 5% of the total weight of the coating, which can ensure that a thin anti-fouling layer is formed on the surface of the coating, which does not affect the air permeability and feel of the leather, but can effectively prevent the penetration and adhesion of stains, thereby improving the cleanliness and aesthetics of the leather.

[0047] Furthermore, the curing step is carried out in an inert gas environment to prevent the coating from being oxidized or aged during the curing process. The curing step is carried out in an inert gas environment. This measure effectively isolates oxygen and other oxidizing substances in the air, avoids possible oxidation reactions or aging of the coating during the curing process, and ensures the long-term stability and reliability of the coating performance.

[0048] Furthermore, the surface coating thickness of the leather is 5 to 20 microns to maintain the breathability and softness of the leather. Controlling the surface coating thickness of the leather between 5 and 20 microns not only ensures the anti-fouling and scratch resistance of the coating, but also avoids the adverse effects of excessively thick coating on the breathability and softness of the leather, thereby maintaining the natural texture and wearing comfort of the leather.

[0049] Furthermore, the substrate of the silicone coating 1 is natural leather or synthetic leather, and the leather substrate is pretreated, and the pretreatment includes cleaning, drying and surface roughening to enhance the adhesion of the coating. The leather substrate is pretreated, including cleaning, drying and surface roughening. These steps can remove impurities and grease on the surface of the substrate and increase the surface roughness, thereby improving the physical bonding force between the coating and the substrate, ensuring that the coating is not easy to fall off or crack during use.

[0050] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A stain-resistant and scratch-resistant silicone leather having a layered structure, characterized in that: From top to bottom, the organic silicon coating (1), the surface layer (2), the middle layer (3) and the bottom layer (4) are sequentially provided. The surface layer (2) is coated with 100% organic silicon material, the middle layer (3) is 100% organic silicon adhesive material, the bottom layer (4) is ultrafine fiber material, and the organic silicon coating (1) comprises the following components: 1): Silicone resin, including methyl polysiloxane and vinyl polysiloxane; 2): Anti-scratch filler, including nano-silicon dioxide particles; 3): Antifouling agent, including fluoride-modified silane; 4); Catalyst, including platinum catalyst; 5): Solvent, comprising a mixed solution of isopropanol and ethyl acetate.

2. The stain-resistant and scratch-resistant silicone leather according to claim 1, characterized in that: The preparation method of the organosilicon coating comprises the following steps: 1): Mixing the silicone resin, the anti-scratch filler and the anti-fouling agent in proportion to form a uniform mixture; 2): adding a catalyst to the mixture and stirring sufficiently to promote the cross-linking reaction; 3): applying the mixture on the surface of the leather substrate to form a wet film; 4): Curing the coated leather at 80°C to 120°C until a uniform silicone coating is formed.

3. The preparation method according to claim 2, characterized in that: In the mixing step, the particle size of the anti-scratch filler is 10 to 50 nanometers to enhance the scratch resistance of the coating.

4. The preparation method according to claim 2, characterized in that: The antifouling agent is added in an amount of 1% to 5% of the total weight of the coating to ensure that the coating has excellent antifouling properties.

5. The stain-resistant and scratch-resistant silicone leather according to claim 1, characterized in that: The coating has a self-cleaning function, and realizes a water drop rolling effect through the combination of surface nanostructure and low surface energy material, thereby effectively removing surface dirt.

6. The preparation method according to claim 2, characterized in that: The curing step is performed in an inert gas environment to prevent the coating from being oxidized or aged during the curing process.

7. The stain-resistant and scratch-resistant silicone leather according to claim 1, characterized in that: The thickness of the surface coating of the leather is 5 to 20 microns to maintain the air permeability and softness of the leather.

8. The stain-resistant and scratch-resistant silicone leather according to claim 1, characterized in that: The substrate of the silicone coating (1) is natural leather or synthetic leather, and the leather substrate is pretreated, wherein the pretreatment includes cleaning, drying and surface roughening to enhance the adhesion of the coating.

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