High-elasticity leather base cloth and preparation method thereof

Abstract

The invention relates to high-elasticity leather base cloth and a preparation method thereof.The high-elasticity leather base cloth comprises a leather cloth body and an elastic coating, the elastic coating is formed after the surface of the leather cloth body is coated with elastic paint, and the elastic paint comprises waterborne polyurethane, an acrylic elastomer component, a titanium dioxide composite system and a flatting agent; the acrylic elastomer component is prepared from the following raw materials: polyacrylate, dopamine hydrochloride and nano particles. The method has the effect of improving the elasticity of the leather.

Description

Technical Field

[0001] This application relates to the field of leather, and in particular to a high-elasticity leather base fabric and a method for preparing the same. Background Technology

[0002] While there are many types of leather-based fabrics on the market, it is difficult to achieve an ideal balance between elasticity and durability. Traditional leather-based fabrics mainly achieve a certain degree of elasticity by blending synthetic and natural fibers and then applying a coating. However, these products often have poor elasticity recovery after repeated stretching and are prone to fiber breakage after long-term use, affecting the product's appearance and lifespan.

[0003] Existing leather base fabrics generally suffer from insufficient elastic recovery and poor durability. In particular, under repeated high-intensity stretching, the products are prone to losing their original shape and performance. Summary of the Invention

[0004] To improve the abrasion resistance of leather base fabric, this application provides a leather base fabric and its preparation method.

[0005] In the first aspect, this application provides a high-elasticity leather base fabric, which adopts the following technical solution: A high-elasticity leather base fabric includes a leather fabric body and an elastic coating. The elastic coating is formed by applying an elastic coating material to the surface of the leather fabric body. The elastic coating material includes waterborne polyurethane, acrylic elastomer components, titanium dioxide composite system, and leveling agent. The acrylic elastomer component raw materials include polyacrylate, dopamine hydrochloride, and nanoparticles.

[0006] By adopting the above technical solution, an elastic coating is formed after coating the surface of the leather body with an elastic coating. The elastic coating can effectively improve the elasticity of the leather fabric. The elastic coating contains an acrylic elastomer composed of polyacrylate, dopamine hydrochloride, and nanoparticles. Polyacrylate has good elasticity and can effectively improve the overall elasticity of the system. At the same time, the addition of nanoparticles as fillers can effectively improve the overall toughness of the system, thereby improving the tensile strength of the system and playing a synergistic role in improving the toughness of the system. In addition, the nanoparticle filler can form a stable cross-linked structure with the acrylic ester, thereby improving the overall strength of the system. Furthermore, the nanoparticles can increase the gaps in the system, so that the prepared leather base fabric maintains good breathability. Dopamine hydrochloride is also added to the system, which can form hydrogen bonds, further improving the overall connection strength of the system, thereby improving the overall stability and adhesion performance of the system.

[0007] Preferably, the acrylic elastomer component is prepared by the following method: Water and sodium dodecyl sulfate were mixed, and ethyl acrylate and acrylic acid were added. The mixture was stirred and emulsified to obtain a composite solution. Ferrous sulfate heptahydrate, ammonium persulfate, and sodium bisulfite were added to the composite solution to initiate the reaction. Tert-butyl hydroperoxide and sodium formaldehyde sulfoxylate were added to obtain polyacrylate. Nano zinc oxide was mixed with dehydrated water and added to the polyacrylate. After stirring, the mixture was allowed to settle and filtered to obtain a composite. Dopamine hydrochloride was mixed with water and added to the composite. The mixture was stirred and allowed to self-polymerize to obtain an acrylic elastomer component.

[0008] By adopting the above technical solution, polyacrylate is prepared by emulsion polymerization using ethyl acrylate and acrylic acid as monomers. Then, it is reacted with nano zinc oxide and dopamine hydrochloride to construct a stable network system and achieve a good cross-linking structure. At the same time, the phenolic hydroxyl groups in dopamine can significantly improve the dispersion performance of nanoparticles in the system and further enhance the overall stability of the system.

[0009] Preferably, the nanoparticles include nano zinc oxide.

[0010] By adopting the above technical solution and selecting nano-zinc oxide as nanoparticles, it can combine with the carboxyl groups in polyacrylate and the catechol groups in dopamine hydrochloride, thereby further improving the overall connectivity of the system.

[0011] Preferably, the mass ratio of the polyacrylate to the nano zinc oxide is 1:(0.065-0.075).

[0012] By adopting the above technical solution, and preferably within the above-mentioned range the mass ratio between polyacrylate and nano zinc oxide, the dispersion and binding properties of nano zinc oxide in the system are more stable, thereby improving the stability of the prepared acrylic elastomer component.

[0013] Preferably, the mass ratio of the polyacrylate to dopamine hydrochloride is 1:(0.001-0.003).

[0014] By adopting the above technical solution, and preferably within the above-mentioned range the mass ratio of polyacrylate to dopamine hydrochloride, the overall stability of the prepared acrylic elastomer component can be effectively improved.

[0015] Preferably, the raw materials of the titanium dioxide composite system include nano-titanium dioxide and nano-carbon nitride.

[0016] By adopting the above technical solutions, titanium dioxide can improve the interfacial bonding performance of the system, maintain the toughness of the coating, and have good hardness, which can further enhance the wear resistance of the system. The gaps formed after its dispersion in the coating can also maintain the air permeability of the coating. The combination of nano-titanium dioxide particles and carbon nitride can play a synergistic role, further improving the wear resistance of the coating system.

[0017] Preferably, the titanium dioxide composite particles are prepared by the following method: Tetrabutyl titanate was mixed with ethanol and stirred to obtain a tetrabutyl titanate dispersion; ethanol and water were mixed to obtain an ethanol solution; the ethanol solution was added to the tetrabutyl titanate dispersion and stirred until a sol was formed. After standing, the sol was dried and calcined to obtain nano-titanium dioxide; melamine was calcined, and the product was further calcined to obtain nano-carbon nitride; nano-carbon nitride was mixed with ethanol and ultrasonically dispersed to obtain a carbon nitride dispersion; nano-titanium dioxide was added to the carbon nitride dispersion, ultrasonicated, and then dried to obtain titanium dioxide composite particles.

[0018] By adopting the above technical solutions, using tetrabutyl titanate as the titanium source through the sol-gel method, nano-titanium dioxide is prepared after sol-gelation and high-temperature calcination; carbon nitride is prepared by thermal exfoliation, and then combined with nano-titanium dioxide to prepare titanium dioxide nanoparticles. This can effectively improve the overall hydrophobicity of the system and further enhance the overall mechanical strength and bonding performance of the elastic coating.

[0019] Preferably, the mass ratio of the nano-titanium dioxide to the nano-carbon nitride is 1:(0.11-0.13).

[0020] By adopting the above technical solution, and preferably keeping the mass ratio between nano-titanium dioxide and nano-carbon nitride within the above range, the overall stability of the prepared titanium dioxide composite particles can be further improved.

[0021] Preferably, the titanium dioxide composite system accounts for 0.5-6 wt% of the elastic coating by mass.

[0022] By adopting the above technical solution, and preferably having the mass percentage of titanium dioxide in the elastic coating within the above range, the overall stability of the prepared elastic coating can be further improved.

[0023] Secondly, this application provides a method for preparing a high-elasticity leather base fabric, employing the following technical solution: A method for preparing a high-elasticity leather base fabric includes the following preparation steps: The elastic coating is injected into the spray gun and sprayed to form an elastic coating on the surface of the leather fabric. After standing, a high-elasticity leather fabric is obtained.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. After coating the surface of the leather body with an elastic coating, an elastic coating layer is formed. The elastic coating can effectively improve the elasticity of the leather fabric. The elastic coating contains an acrylic elastomer composed of polyacrylate, dopamine hydrochloride, and nanoparticles. Polyacrylate has good elasticity and can effectively improve the overall elasticity of the system. At the same time, the addition of nanoparticles as fillers can effectively improve the overall toughness of the system, thereby improving the tensile strength of the system, thus playing a synergistic role in improving the toughness of the system. In addition, the nanoparticle filler can form a stable cross-linked structure with the acrylic acrylate, thereby improving the overall strength of the system. Furthermore, the nanoparticles can increase the gaps in the system, thus allowing the prepared leather base fabric to maintain good breathability. Dopamine hydrochloride is also added to the system, which can form hydrogen bonds, further improving the overall connection strength of the system, thereby improving the overall stability and adhesion performance of the system. 2. Polyacrylate was prepared by emulsion polymerization using ethyl acrylate and acrylic acid as monomers. Then, it was reacted with nano zinc oxide and dopamine hydrochloride to construct a stable network system and achieve a good cross-linking structure. At the same time, the phenolic hydroxyl groups in dopamine can significantly improve the dispersion performance of nanoparticles in the system and further enhance the overall stability of the system. 3. Nano-titanium dioxide was prepared by using tetrabutyl titanate as the titanium source through a sol-gel method, followed by high-temperature calcination. Carbon nitride was prepared by thermal exfoliation, and then combined with nano-titanium dioxide to prepare titanium dioxide nanoparticles. This method can effectively improve the overall hydrophobicity of the system and further enhance the overall mechanical strength and bonding performance of the elastic coating. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments: Raw material description: All raw materials in the examples are commercially available; the leveling agent is polydimethylsiloxane (CAS No.: 9016-00-6).

[0026] Example 1 Preparation of acrylic elastomer components: Mix 200g of water with 11.2g of sodium dodecyl sulfate (CAS No.: 151-21-3), then add 500g of ethyl acrylate (CAS No.: 140-88-5) and 19.2g of acrylic acid (CAS No.: 79-10-7), stir and emulsify for 1 hour to obtain a composite solution. Add 4.2mL of 0.6wt% ferrous sulfate heptahydrate, 49mL of 7wt% ammonium persulfate, and 80mL of 11.5wt% sodium bisulfite to the composite solution, heat to 85℃ to initiate the reaction and hold for 15 minutes, then add 25g of tert-butyl hydroperoxide (CAS No.: 75- 91-2) and 12.5g of sodium formaldehyde sulfoxylate (CAS No.: 149-44-0) were cooled to 25℃ and then neutralized with ammonia water to pH 5 to obtain polyacrylate; 3.25g of nano zinc oxide was mixed and dispersed with deionized water and added to 50g of the polyacrylate prepared above, stirred for 1h, and then settled for 24h. After filtration, a composite was obtained; 0.05g of dopamine hydrochloride (CAS No.: 62-31-7) was mixed with 50g of deionized water to obtain a dopamine hydrochloride solution. The dopamine hydrochloride solution was added to the composite and stirred for self-polymerization for 30min to obtain the acrylic elastomer component.

[0027] Preparation of titanium dioxide composite particles: 150g of tetrabutyl titanate was mixed with 150g of anhydrous ethanol and magnetically stirred for 30min to obtain a tetrabutyl titanate dispersion. 90g of anhydrous ethanol was mixed with 45g of deionized water, and the pH was adjusted to 2 using concentrated hydrochloric acid to obtain an ethanol solution. The ethanol solution was added to the tetrabutyl titanate dispersion, and stirring was maintained until a sol was formed. After standing for 24h, the mixture was heated to 100℃ and dried. After grinding, it was calcined in a tube furnace at 500℃ for 2h to obtain nano-titanium dioxide. Melamine (… CAS No.: 108-78-1) was calcined in a muffle furnace at 500℃ for 4 hours, ground and crushed, and the resulting product was further calcined in a muffle furnace at 500℃ for 2 hours. After grinding, nano carbon nitride was obtained. 0.99 g of nano carbon nitride was mixed with 100 g of anhydrous ethanol and ultrasonically dispersed for 2 hours to obtain a carbon nitride dispersion. 9.01 g of nano titanium dioxide was added to the carbon nitride dispersion and ultrasonicated until the ethanol evaporated. Then, it was dried at 120℃ for 2 hours to obtain titanium dioxide composite particles.

[0028] Preparation of elastic coatings: The following substances are mixed according to the following mass percentages: 8 wt% acrylic elastic component, 2 wt% titanium dioxide composite system, 1 wt% leveling agent, and the remainder is waterborne polyurethane. After mixing, the mixture is ultrasonically dispersed for 2 hours to obtain an elastic coating.

[0029] Preparation of high-elasticity leather base fabric: The elastic coating is injected into the spray gun at a vertical distance of 25cm from the leather fabric body. The spray gun is held at a 60° angle to the surface of the leather fabric body, and the spray gun moves at a speed of 10cm / s. The spray gun is sprayed back and forth twice to form an elastic coating on the surface of the leather fabric body. After standing at room temperature for 24 hours, the elastic coating adheres more stably to the leather fabric body, resulting in a high-elasticity leather fabric.

[0030] Example 2 Preparation of acrylic elastomer components: Mix 200g of water with 11.2g of sodium dodecyl sulfate, then add 500g of ethyl acrylate and 19.2g of acrylic acid, stir and emulsify for 1 hour to obtain a composite solution. Add 4.2mL of 0.6wt% ferrous sulfate heptahydrate, 49mL of 7wt% ammonium persulfate, and 80mL of 11.5wt% sodium bisulfite to the composite solution. Heat to 85℃ to initiate the reaction and maintain for 15 minutes. Add 25g of tert-butyl hydroperoxide and 12.5g of formaldehyde. Sodium sulfate was cooled to 25°C and neutralized to pH 5 with ammonia water to obtain polyacrylate. 3.75g of nano zinc oxide was mixed and dispersed with deionized water and added to 50g of the polyacrylate prepared above. The mixture was stirred for 1 hour, then allowed to settle for 24 hours. After filtration, a composite was obtained. 0.15g of dopamine hydrochloride was mixed with 50g of deionized water to obtain a dopamine hydrochloride solution. The dopamine hydrochloride solution was added to the composite and stirred for self-polymerization for 30 minutes to obtain the acrylic elastomer component.

[0031] Preparation of titanium dioxide composite particles: 150g of tetrabutyl titanate and 150g of anhydrous ethanol were mixed and magnetically stirred for 30min to obtain a tetrabutyl titanate dispersion. 90g of anhydrous ethanol and 45g of deionized water were mixed, and the pH of the system was adjusted to 2 using concentrated hydrochloric acid to obtain an ethanol solution. The ethanol solution was added to the tetrabutyl titanate dispersion, and stirring was maintained until a sol was formed. After standing for 24h, the mixture was heated to 100℃ and dried. After grinding, it was calcined in a tube furnace at 500℃ for 2h to obtain nano-carbon dioxide. Titanium; melamine was calcined in a muffle furnace at 500℃ for 4 hours, ground and crushed, and the resulting product was further calcined in a muffle furnace at 500℃ for 2 hours, and then ground to obtain nano carbon nitride; 1.15g of nano carbon nitride was mixed with 100g of anhydrous ethanol and ultrasonically dispersed for 2 hours to obtain a carbon nitride dispersion; 8.85g of nano titanium dioxide was added to the carbon nitride dispersion, ultrasonicated until the ethanol evaporated, and then dried at 120℃ for 2 hours to obtain titanium dioxide composite particles.

[0032] Preparation of elastic coatings: The following substances were mixed according to the following mass percentages: 12 wt% acrylic elastic component, 4 wt% titanium dioxide composite system, 3 wt% leveling agent, and the remainder was waterborne polyurethane. After mixing, the mixture was ultrasonically dispersed for 2 hours to obtain an elastic coating.

[0033] Preparation of high-elasticity leather base fabric: The elastic coating is injected into the spray gun at a vertical distance of 25cm from the leather fabric body. The spray gun is held at a 60° angle to the surface of the leather fabric body, and the spray gun moves at a speed of 10cm / s. The spray gun is sprayed back and forth twice to form an elastic coating on the surface of the leather fabric body. After standing at room temperature for 24 hours, the elastic coating adheres more stably to the leather fabric body, resulting in a high-elasticity leather fabric.

[0034] Example 3 Preparation of acrylic elastomer components: Mix 200g of water with 11.2g of sodium dodecyl sulfate, then add 500g of ethyl acrylate and 19.2g of acrylic acid, stir and emulsify for 1 hour to obtain a composite solution. Add 4.2mL of 0.6wt% ferrous sulfate heptahydrate, 49mL of 7wt% ammonium persulfate, and 80mL of 11.5wt% sodium bisulfite to the composite solution. Heat to 85℃ to initiate the reaction and maintain for 15 minutes. Add 25g of tert-butyl hydroperoxide and 12.5g of formaldehyde. Sodium hyposulfite was cooled to 25°C and neutralized to pH 5 with ammonia water to obtain polyacrylate. 3.5g of nano zinc oxide was mixed and dispersed with deionized water and added to 50g of the polyacrylate prepared above. The mixture was stirred for 1 hour, then allowed to settle for 24 hours. After filtration, a composite was obtained. 0.1g of dopamine hydrochloride was mixed with 50g of deionized water to obtain a dopamine hydrochloride solution. The dopamine hydrochloride solution was added to the composite and stirred for self-polymerization for 30 minutes to obtain the acrylic elastomer component.

[0035] Preparation of titanium dioxide composite particles: 150g of tetrabutyl titanate and 150g of anhydrous ethanol were mixed and magnetically stirred for 30min to obtain a tetrabutyl titanate dispersion. 90g of anhydrous ethanol and 45g of deionized water were mixed, and the pH of the system was adjusted to 2 using concentrated hydrochloric acid to obtain an ethanol solution. The ethanol solution was added to the tetrabutyl titanate dispersion, and stirring was maintained until a sol was formed. After standing for 24h, the mixture was heated to 100℃ and dried. After grinding, it was calcined in a tube furnace at 500℃ for 2h to obtain nano-carbon dioxide. Titanium; melamine was calcined in a muffle furnace at 500℃ for 4 hours, ground and crushed, and the resulting product was further calcined in a muffle furnace at 500℃ for 2 hours, and then ground to obtain nano carbon nitride; 1.07 g of nano carbon nitride was mixed with 100 g of anhydrous ethanol and ultrasonically dispersed for 2 hours to obtain a carbon nitride dispersion; 8.93 g of nano titanium dioxide was added to the carbon nitride dispersion, ultrasonicated until the ethanol evaporated, and then dried at 120℃ for 2 hours to obtain titanium dioxide composite particles.

[0036] Preparation of elastic coatings: The following substances were mixed according to the following mass percentages: 10 wt% acrylic elastic component, 3 wt% titanium dioxide composite system, 2 wt% leveling agent, and the remainder was waterborne polyurethane. After mixing, the mixture was ultrasonically dispersed for 2 hours to obtain an elastic coating.

[0037] Preparation of high-elasticity leather base fabric: The elastic coating is injected into the spray gun at a vertical distance of 25cm from the leather fabric body. The spray gun is held at a 60° angle to the surface of the leather fabric body, and the spray gun moves at a speed of 10cm / s. The spray gun is sprayed back and forth twice to form an elastic coating on the surface of the leather fabric body. After standing at room temperature for 24 hours, the elastic coating adheres more stably to the leather fabric body, resulting in a high-elasticity leather fabric.

[0038] Example 4 Example 4 is based on Example 3. The difference between Example 4 and Example 3 is that in Example 4, 2.5g of nano zinc oxide was used when preparing the acrylic elastomer component.

[0039] Example 5 Example 5 is based on Example 3. The difference between Example 5 and Example 3 is that in Example 5, 4.5g of nano zinc oxide was used when preparing the acrylic elastomer component.

[0040] Example 6 Example 6 is based on Example 3. The difference between Example 6 and Example 3 is that in Example 6, 0.025g of dopamine hydrochloride was used when preparing the acrylic elastomer component.

[0041] Example 7 Example 7 is based on Example 3. The difference between Example 7 and Example 3 is that in Example 7, 0.25g of dopamine hydrochloride was used when preparing the acrylic elastomer component.

[0042] Example 8 Example 8 is based on Example 3. The difference between Example 8 and Example 3 is that in Example 8, when preparing the acrylic elastomer component, nano zinc oxide is replaced with nano silver oxide.

[0043] Example 9 Example 9 is based on Example 3. The difference between Example 9 and Example 3 is that in Example 9, when preparing titanium dioxide composite particles, 9.26g of nano titanium dioxide and 0.74g of nano carbon nitride were used.

[0044] Example 10 Example 10 is based on Example 3. The difference between Example 10 and Example 3 is that in Example 10, 8.62g of nano-titanium dioxide and 1.38g of nano-carbon nitride were used when preparing titanium dioxide composite particles.

[0045] Example 11 Example 11 is based on Example 3. The difference between Example 11 and Example 3 is that in Example 11, the mass percentage of the titanium dioxide composite system is 0.5 wt% when preparing the elastic coating.

[0046] Example 12 Example 12 is based on Example 3. The difference between Example 12 and Example 3 is that in Example 12, the mass percentage of the titanium dioxide composite system is 6 wt% when preparing the elastic coating.

[0047] Comparative Example 1 Comparative Example 1 is based on Example 3, but no dopamine hydrochloride was added when preparing the acrylic elastomer component in Comparative Example 1.

[0048] Comparative Example 2 Comparative Example 2 is based on Example 3, but no nano zinc oxide was added when preparing the acrylic elastomer component in Comparative Example 2.

[0049] Comparative Example 3 Comparative Example 3 is based on Example 3, except that in the preparation of the elastic coating, the titanium dioxide composite particles were replaced with ordinary nano titanium dioxide.

[0050] Performance testing Samples from Examples 1-12 and Comparative Examples 1-3 were taken and subjected to the following performance tests: (1) Elastic properties With reference to GB / T24218.3-2010, the breaking strength and elongation at break of the specimens were tested at intervals of 20 cm and tensile speeds of 100 mm / min. Each specimen was tested three times, and the average value was taken. The test results were recorded in Table 1. The tensile recovery speed of artificial leather was tested, specifically measuring the following two indicators: ① the recovery rate after 1 second of warp elongation of 10%; ② the recovery rate after 1 second of weft elongation of 30%. The measurement methods for the above two indicators are as follows: Fabric samples were prepared and placed into the tensile testing machine clamps in the warp and weft directions respectively, with a spacing of 20 cm. The stretching speed was 100 mm / min. After the warp stretching elongation reached 10% or the weft stretching elongation reached 30%, one clamp was released. The process was recorded with a camera, and the elongation rate of the fabric sample 1 second after release was analyzed and calculated relative to the elongation before stretching.

[0051] (2) Breathability The air permeability of the sample was tested with reference to GB / T 24218.15-2018. The experimental pressure difference was 100 Pa, and the test area was 20 cm². 2 Each sample was tested three times, the average value was taken, and the test results were recorded in Table 2.

[0052] (3) Wear resistance Abrasion resistance was tested with reference to ASTM D 3885-2004 at a temperature of (20±2)℃ and a relative humidity of (25±4)%. Each sample was tested three times, and the average value was taken. The test results were recorded in Table 2.

[0053] Table 1 Performance test results of Examples 1-12 and Comparative Examples 1-3 (1) Table 2 Performance test results of Examples 1-12 and Comparative Examples 1-3 (2) As shown in Tables 1 and 2, the radial breaking strength of Examples 1-3 is all 549 N or higher, the weft breaking strength is all 527 N or higher, the radial breaking elongation is all 59% or higher, the weft breaking elongation is all 54% or higher, the recovery rate after 1 second of 10% radial elongation is all 93.8% or higher, and the recovery rate after 1 second of 10% weft elongation is all 94.4% or higher. This indicates that the leather base fabric prepared in this application has good elasticity; the air permeability of Examples 1-3 is all above 25.4 L·(m³). 2 ·s) -1The above indicates that the leather base fabric prepared in this application has good air permeability; the number of friction cycles in Examples 1-3 is all 4523 times or more, indicating that the leather base fabric prepared in this application has good abrasion resistance.

[0054] In Examples 4 and 5, the mass ratio between nano zinc oxide and polyacrylate during the preparation of the acrylic elastic component was not within the range specified in this application. When the content of nano zinc oxide was too low, the tensile strength of the coating was difficult to improve further, and too little nano zinc oxide was difficult to improve the overall gap of the system, resulting in a decrease in air permeability. When the content of nano zinc oxide was too high, the nano zinc oxide agglomerated in the system, and the stability of the system decreased. Therefore, the performance of Examples 4 and 5 decreased.

[0055] In Examples 6 and 7, the mass ratio between dopamine hydrochloride and polyacrylate during the preparation of the acrylic elastic component was not within the range specified in this application. When the content of dopamine hydrochloride was too low, it was difficult to further improve the dispersion performance of nano zinc oxide in the system, and the stability of the elastic coating decreased. When the content of dopamine hydrochloride was too high, it would affect the overall stability of the system and reduce the toughness and wear resistance of the system. Therefore, the performance of Examples 6 and 7 was reduced.

[0056] In Example 8, when preparing the acrylic elastomer component, nano-zinc oxide was replaced with nano-silver oxide. Since the stability of nano-silver oxide is worse than that of nano-zinc oxide, all properties in this example decreased.

[0057] In Examples 9 and 10, the mass ratio between nano-titanium dioxide and nano-carbon nitride during the preparation of titanium dioxide composite particles was not within the range specified in this application. When the content of nano-carbon nitride was too low, it was difficult to further improve the bonding performance between the systems and to play a synergistic role in improving the wear resistance of the system. When the content of nano-carbon nitride was too high, it would also affect the bonding stability between nano-titanium dioxide. Therefore, the performance of Examples 9 and 10 was reduced.

[0058] In Examples 11 and 12, the proportion of the titanium dioxide composite system in the elastic coating is not within the range specified in this application. When the content of the titanium dioxide composite system is too low, it is difficult to further improve the wear resistance of the elastic coating. When the content of the titanium dioxide composite system is too high, agglomeration occurs in the system, affecting the stability.

[0059] In Comparative Example 1, no dopamine hydrochloride was added during the preparation of the acrylic elastomer component. As a result, the nano zinc oxide agglomerated in the system and was difficult to form a stable cross-linked structure, which affected the overall stability of the elastic coating.

[0060] In Comparative Example 2, no nano zinc oxide was added when preparing the acrylic elastomer component. Without the addition of nano zinc oxide, it is difficult to construct a stable cross-linked structure. Furthermore, without the reinforcement of nano fillers, the stability of the system decreases, and the air permeability is affected.

[0061] In Comparative Example 3, the titanium dioxide composite particles were replaced with ordinary nano-titanium dioxide. Ordinary nano-titanium dioxide is difficult to synergistically improve the overall performance of the system.

[0062] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A high-elasticity leather base fabric, characterized in that: It includes a leather fabric body and an elastic coating. The elastic coating is formed by applying an elastic coating to the surface of the leather fabric body. The elastic coating includes water-based polyurethane, acrylic elastomer components, titanium dioxide composite system, and leveling agent. The acrylic elastomer component raw materials include polyacrylate, dopamine hydrochloride, and nanoparticles.

2. The high-elasticity leather base fabric according to claim 1, characterized in that: The acrylic elastomer component was prepared by the following method: Water and sodium dodecyl sulfate were mixed, and ethyl acrylate and acrylic acid were added. The mixture was stirred and emulsified to obtain a composite solution. Ferrous sulfate heptahydrate, ammonium persulfate, and sodium bisulfite were added to the composite solution to initiate the reaction. Tert-butyl hydroperoxide and sodium formaldehyde sulfoxylate were added to obtain polyacrylate. Nano zinc oxide was mixed with dehydrated water and added to the polyacrylate. After stirring, the mixture was allowed to settle and filtered to obtain a composite. Dopamine hydrochloride was mixed with water and added to the composite. The mixture was stirred and allowed to self-polymerize to obtain an acrylic elastomer component.

3. The high-elasticity leather base fabric according to claim 2, characterized in that: The nanoparticles include nano zinc oxide.

4. The high-elasticity leather base fabric according to claim 3, characterized in that: The mass ratio between the polyacrylate and nano zinc oxide is 1:(0.065-0.075).

5. The high-elasticity leather base fabric according to claim 2, characterized in that: The mass ratio of the polyacrylate to dopamine hydrochloride is 1:(0.001-0.003).

6. The high-elasticity leather base fabric according to claim 1, characterized in that: The raw materials of the titanium dioxide composite system include nano-titanium dioxide and nano-carbon nitride.

7. The high-elasticity leather base fabric according to claim 6, characterized in that: The titanium dioxide composite particles were prepared using the following method: Tetrabutyl titanate was mixed with ethanol and stirred to obtain a tetrabutyl titanate dispersion; ethanol and water were mixed to obtain an ethanol solution; the ethanol solution was added to the tetrabutyl titanate dispersion and stirred until a sol was formed. After standing, the sol was dried and calcined to obtain nano-titanium dioxide; melamine was calcined, and the product was further calcined to obtain nano-carbon nitride; nano-carbon nitride was mixed with ethanol and ultrasonically dispersed to obtain a carbon nitride dispersion; nano-titanium dioxide was added to the carbon nitride dispersion, ultrasonicated, and then dried to obtain titanium dioxide composite particles.

8. The high-elasticity leather base fabric according to claim 7, characterized in that: The mass ratio between the nano-titanium dioxide and the nano-carbon nitride is 1:(0.11-0.13).

9. The high-elasticity leather base fabric according to claim 1, characterized in that: The titanium dioxide composite system accounts for 0.5-6 wt% of the elastic coating by mass.

10. A method for preparing the high-elasticity leather base fabric according to claim 1, characterized in that: The preparation steps include the following: The elastic coating is injected into the spray gun and sprayed to form an elastic coating on the surface of the leather fabric. After standing, a high-elasticity leather fabric is obtained.

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