Oxford fabric composite material and preparation method thereof

Abstract

The invention relates to an oxford fabric composite material and a preparation method thereof, and belongs to the technical field of oxford fabric preparation. The composite material is composed of Oxford fabric surface layers on the upper side and the lower side and modified reinforced fibers on the middle layer, and the Oxford fabric surface layers and the middle layer are bonded through specific adhesives. The preparation of the modified reinforced fibers of the middle layer relates to mixing, grinding and subsequent treatment of polypropylene fibers, aramid fibers and carbon nanotubes, and finally a high-strength fiber layer is formed. The adhesive is prepared from polyurethane resin, rosin resin, acetic ether and other raw materials. When the composite material is prepared, the inner side of the oxford fabric is coated with an adhesive, the oxford fabric is bonded with the modified reinforced fibers of the middle layer, and the composite material is finally obtained through pressing, drying, cutting and softening treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of Oxford cloth preparation, and relates to an Oxford cloth composite material and a preparation method thereof. Background Art

[0002] As a common synthetic fiber material, Oxford cloth is widely used in the fields of outdoor products, luggage, tents, etc. due to its high strength, wear resistance, light weight and other characteristics. However, with the continuous improvement of people's requirements for material performance, traditional Oxford cloth materials have become difficult to meet the needs in certain specific application scenarios. Especially in occasions where higher strength, better wear resistance and special functionality are required, the performance bottleneck of traditional Oxford cloth is becoming increasingly prominent.

[0003] In order to improve the performance of Oxford cloth, researchers have tried to combine different materials through composite material technology to give play to their respective advantages. Among them, modified reinforced fibers, as a high-performance material, have become an ideal choice for enhancing the performance of Oxford cloth due to their excellent mechanical properties and stability. By combining modified reinforced fibers with Oxford cloth, the overall strength, wear resistance and service life of the composite material can be significantly improved. Therefore, developing a new type of Oxford cloth composite material and its preparation method to improve the performance of the composite material, enhance the bonding strength, and optimize the preparation process has important practical significance and application value. Based on this background, the present invention proposes a solution that uses modified reinforced fibers as the intermediate layer and combines them with Oxford cloth through a specific preparation process to form a high-performance composite material. Summary of the Invention

[0004] The purpose of the present invention is to provide an Oxford cloth composite material and a preparation method thereof, which have the characteristics of high strength.

[0005] The purpose of the present invention can be achieved by the following technical solutions: An Oxford cloth composite material, characterized in that the Oxford cloth composite material includes Oxford cloth surface layers on the upper and lower sides and a modified reinforced fiber intermediate layer, and the Oxford cloth surface layers and the modified reinforced fiber intermediate layer are bonded by an adhesive. Among them, the preparation method of the modified reinforced fiber intermediate layer is as follows. S1: Mix polypropylene fibers and aramid fibers in a mass ratio of 1:(1 - 2), and grind them in a ball mill at a rotation speed of 400 r / min for 2 h to obtain mixture A. S2: Mix mixture A and carbon nanotubes in a mass ratio of (0.5 - 1):1, and increase the rotation speed of the ball mill to 600 r / min and continue to grind for 1 h to obtain mixture B. S3: Disperse mixture B in the nano-silica sol, heat the nano-silica sol to 70 - 120 °C, while stirring at a speed of 180 r / min for 0.5 - 1 h, filter, and dry at 80 °C for 12 h to obtain mixed fiber C; S4: Immerse mixed fiber C in methacrylic acid, and perform ultrasonic treatment during immersion for 1 - 2 h to obtain mixed fiber D; S5: Spread mixed fiber D into a mesh structure, and dry it at room temperature in a nitrogen atmosphere to form a fiber grid; S6: Uniformly coat a layer of silicone oil with a concentration of 20 - 30% on the surface of the fiber grid, and dry it by laser drying method to obtain the high-strength fiber layer.

[0006] Further, the preparation method of the adhesive in S1 is as follows, S1.1: Heat the polyurethane resin to 170 °C to make it in a molten state, add rosin resin to the polyurethane resin, and the volume ratio of the two is 5:1. While adding, stir at a speed of 300 r / min for 30 - 50 min to obtain mixed resin I; S1.2: Add ethyl acetate to mixed resin I, and the volume ratio of the two is 1:4. Continuously stir at a speed of 300 r / min, and slowly cool down to 60 °C, then add 5 - 10 wt% azobisisobutyronitrile, and stir for 1 h to obtain mixture II; S1.3: Add 5 wt% talcum powder and 1 wt% silane coupling agent KH550 to mixture II, adjust the speed to 500 r / min, and stir for 20 - 30 min to obtain the adhesive.

[0007] Further, the particle size of the mixture A obtained by grinding in S1 is 500 mesh.

[0008] Further, the particle size of the mixture B obtained by grinding in S2 is 800 mesh.

[0009] Further, the parameters of the laser drying method in S6 are laser power 300 W, temperature 60 °C, and irradiation duration 3 - 5 min.

[0010] A preparation method of an Oxford cloth composite material, the preparation method of the composite material is as follows, A layer of adhesive is applied to the inner side of the Oxford cloth on the upper and lower sides, and then the middle layer of modified reinforced fiber and the Oxford cloth are bonded together, and then allowed to stand for 10 to 20 minutes. Then, both sides of the composite material are pressed simultaneously with a force of 5 kN, and then the composite material is transferred to 60° C. for drying, and the composite material is cut, and the composite material is immersed in 10% by mass silicone oil, the cloth is softened, and the composite material is obtained after drying.

[0011] Furthermore, the coating amount of the adhesive is 50 g / m 2 .

[0012] Furthermore, the softening treatment parameters are: temperature 40°C, time 1-2h.

[0013] Furthermore, the drying parameters are drying at 60° C. for 2 h and drying at 80° C. for 0.5 h.

[0014] The Oxford cloth composite material and the preparation method thereof of the present invention exhibit significant advantages in many aspects.

[0015] First, in terms of material properties, the present invention effectively improves the strength and wear resistance of the composite material through a unique modified reinforced fiber preparation process. The mixed grinding of polypropylene fiber and aramid fiber, as well as the addition of carbon nanotubes, not only optimizes the microstructure of the fiber, but also significantly enhances the bonding force between the fibers, so that the composite material exhibits higher strength and toughness when subjected to external forces. At the same time, the treatment of nano-silica sol and methacrylic acid further improves the surface properties of the fiber and improves the adhesion between the fiber and the matrix material, thereby enhancing the overall performance of the composite material.

[0016] Secondly, in terms of preparation process, the present invention adopts laser drying and softening treatment steps to ensure the uniformity and stability of the composite material. The laser drying method can quickly and evenly dry the silicone oil on the surface of the fiber mesh, avoiding material deformation or performance degradation that may be caused by traditional drying methods. The softening treatment helps to further improve the flexibility and feel of the composite material.

[0017] The core components of the high-strength fiber layer of the present invention include polypropylene fiber, aramid fiber, carbon nanotube, nano-silica sol, methacrylic acid and silicone oil. Polypropylene fiber is used as the basic material with its good mechanical strength and processing performance to provide the basic skeleton of the fiber layer; aramid fiber further enhances the overall strength and high temperature resistance of the fiber layer with its high strength, high modulus and excellent heat resistance. The two are mixed in a certain proportion and ground in a ball mill, and the fiber is refined and evenly dispersed through physical shearing and collision, laying a good foundation for subsequent modification treatment.

[0018] As a nano-scale reinforcing phase, carbon nanotubes can effectively enhance the interaction force between fibers and form a denser fiber network due to their unique structure and high specific surface area. During the ball milling process, physical entanglement and chemical bonding occur between carbon nanotubes, polypropylene fibers, and aramid fibers, further enhancing the mechanical properties of the fiber layer.

[0019] Nano-silica sol plays a crucial role in the fiber modification process. By dispersing mixture B in nano-silica sol and heating with stirring, the silica nanoparticles in the sol can uniformly adhere to the fiber surface, forming a dense protective layer. This step not only improves the wear resistance and weather resistance of the fibers but also provides more reaction sites for the subsequent cross-linking treatment with methacrylic acid.

[0020] The soaking and ultrasonic treatment with methacrylic acid are the key steps to achieve chemical cross-linking between fibers. Under ultrasonic action, methacrylic acid molecules can penetrate into the fibers and react with functional groups such as hydroxyl and carboxyl groups on the fiber surface to form stable chemical bonds. This chemical cross-linking process significantly enhances the binding force between fibers and improves the overall strength and stability of the fiber layer.

[0021] After spreading the mixed fibers into a network structure and drying in a nitrogen atmosphere, a fiber grid with excellent mechanical properties is formed. This step not only optimizes the arrangement of the fibers but also avoids the oxidative degradation of the fibers during high-temperature drying through nitrogen protection, further enhancing the performance of the fiber layer.

[0022] Finally, a layer of silicone oil with a concentration of 20 - 30% is uniformly coated on the surface of the fiber grid and dried by laser drying method to obtain a high-strength fiber layer. As a lubricant, silicone oil can reduce the friction coefficient between fibers and improve the wear resistance and sliding performance of the composite material. At the same time, the laser drying method can quickly cure the silicone oil coating to form a stable and uniform protective film, further enhancing the stability and durability of the fiber layer.

[0023] In the preparation process of the Oxford cloth composite material, the performance of the adhesive has a crucial impact on the overall performance of the composite material.

[0024] As the main component of the adhesive, polyurethane resin has excellent adhesion, abrasion resistance, and elasticity. After being heated to the molten state, polyurethane resin can form a continuous bonding phase, tightly bonding the surface layer of the Oxford cloth and the modified reinforcing fibers in the middle layer together. In addition, polyurethane resin also has good processing properties, facilitating mixing and coating during the preparation process; the addition of rosin resin aims to improve the adhesion and fluidity of the adhesive. Its unique chemical structure enables rosin resin to interact with polyurethane resin, forming a denser bonding network. At the same time, rosin resin can also reduce the viscosity of the adhesive, enhancing its fluidity during the coating process, thereby ensuring that the adhesive can uniformly and fully penetrate between the surface layer of the Oxford cloth and the modified reinforcing fibers in the middle layer; ethyl acetate, as a solvent, mainly plays the role of diluting and adjusting the viscosity. By adding ethyl acetate to the mixed resin I, the viscosity of the adhesive can be reduced, making it easier to coat and penetrate. In addition, the volatility of ethyl acetate can also promote the rapid drying of the adhesive during the curing process, thereby improving production efficiency; azobisisobutyronitrile, as an initiator, can initiate a polymerization reaction during the curing process of the adhesive. By adding an appropriate amount of azobisisobutyronitrile, the cross-linking reaction between polyurethane resin and rosin resin can be accelerated, forming a more stable chemical structure. This step is of great significance for improving the heat resistance, chemical resistance, and mechanical strength of the adhesive; the addition of talcum powder aims to improve the filling and abrasion resistance of the adhesive. Talcum powder particles can be evenly dispersed in the adhesive, forming a physical barrier to effectively prevent the erosion of external factors on the composite material. At the same time, talcum powder can also enhance the shear strength of the adhesive, improving the overall stability of the composite material; silane coupling agent KH550 plays a bridging role in the adhesive, capable of connecting talcum powder with polyurethane resin and rosin resin. Through its unique chemical structure, silane coupling agent KH550 can react with the hydroxyl groups on the surface of inorganic materials to form chemical bonding; at the same time, the other end of it can interact with organic materials, thus achieving a tight connection between inorganic materials and organic materials. This step is of great significance for improving the adhesion and weather resistance of the adhesive.

[0025] During the preparation process, complex interactions and reactions occurred among these substances. Polyurethane resin and rosin resin underwent physical mixing after being heated and melted to form mixed resin I. Subsequently, the addition of ethyl acetate reduced the viscosity of mixed resin I and promoted its uniform mixing with azobisisobutyronitrile. During the stirring process, azobisisobutyronitrile initiated a polymerization reaction, causing a cross-linking reaction between polyurethane resin and rosin resin to form a stable chemical structure. At the same time, the addition of talcum powder and silane coupling agent KH550 further enhanced the filling, abrasion resistance, and adhesion of the adhesive.

[0026] Through carefully designed components and preparation processes, the adhesive achieves excellent adhesion, abrasion resistance, elasticity, and heat resistance. The improvement of these properties not only helps to enhance the overall performance of the Oxford cloth composite material but also provides strong support for its wide use in various application scenarios.

[0027] During the preparation process of the Oxford cloth composite material, by adopting the method of standing still first and then pressing, the intermediate layer of modified reinforced fibers and the Oxford cloth can be fully infiltrated and bonded, improving the overall structural stability of the composite material. In addition, the drying treatment at 60°C and subsequent steps of cutting and softening treatment with silicone oil not only effectively remove the residual moisture and volatile substances in the composite material but also further improve the softness and hand feeling of the cloth through the softening effect of silicone oil. Especially the drying treatments at 60°C and 80°C respectively ensure the complete removal of moisture inside the composite material and the final curing of the structure, thus significantly improving the durability and service life of the composite material. These advantages make the preparation method described in the present invention have broad application prospects and significant economic benefits in the production field of Oxford cloth composite materials.

[0028] In the present invention, the polypropylene fiber is purchased from Wuhan Karnos Technology Co., Ltd. with a purity of 99%; the aramid fiber is purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd. with a purity of 99%; the nano-silica sol is purchased from Guangdong Yunxing Biotechnology Co., Ltd. with a purity of 99.99%; the carbon nanotubes are purchased from Shanghai Liantian Material Technology Co., Ltd. with a purity of 99.9%; the silicone oil is purchased from Jinan Longcheng Organosilicon Co., Ltd. with a purity of 99.99%; the azobisisobutyronitrile is purchased from Jinan Century Tongda Chemical Co., Ltd. with a purity of 99%; the talcum powder is purchased from Hebei Clavell Biotechnology Co., Ltd. with a purity of 99%.

[0029] Advantages of the present invention: In the present invention, by using the composite modified reinforced fiber of polypropylene fiber, aramid fiber, and carbon nanotubes as the intermediate layer, the tensile strength, abrasion resistance, and tear resistance of the composite material are effectively improved. At the same time, the introduction of nano-silica sol and methacrylic acid further enhances the bonding force between fibers and the overall stability of the composite material, enabling the composite material to exhibit excellent performance in various application environments; the preparation method of the present invention combines multiple technical means to achieve efficient and precise modification of raw materials while ensuring the tight bonding between layers of the composite material. In addition, by optimizing the preparation process of the adhesive, the adhesive force and weather resistance of the adhesive are improved, further ensuring the overall quality of the composite material. Specific embodiments

[0030] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in conjunction with embodiments, elaborate in detail on the specific implementation manners, structures, features and their effects according to the present invention as follows.

[0031] Embodiment 1 A kind of Oxford cloth composite material, characterized in that the Oxford cloth composite material includes Oxford cloth surface layers on both the upper and lower sides and a modified reinforced fiber in the middle layer, and the Oxford cloth surface layers and the modified reinforced fiber in the middle layer are bonded by an adhesive. Among them, the preparation method of the modified reinforced fiber in the middle layer is as follows. S1: Mix polypropylene fiber and aramid fiber according to a mass ratio of 1:2, grind them in a ball mill at a rotation speed of 400 r / min for 2 h to obtain mixture A, and the particle size of mixture A is 500 mesh. The preparation method of the adhesive is as follows. S1.1: Heat the polyurethane resin to 170 °C to make it in a molten state, add rosin resin to the polyurethane resin, and the volume ratio of the two is 5:1. While adding, stir at a rotation speed of 300 r / min for 3 min to obtain mixed resin I. S1.2: Add ethyl acetate to mixed resin I, and the volume ratio of the two is 1:4. Continuously stir at a rotation speed of 300 r / min and slowly cool down to 60 °C, then add 10 wt% azobisisobutyronitrile and stir for 1 h to obtain mixture II. S1.3: Add 5 wt% talcum powder and 1 wt% silane coupling agent KH550 to mixture II, adjust the rotation speed to 500 r / min, and stir for 20 min to obtain the adhesive. S2: Mix mixture A and carbon nanotubes according to a mass ratio of 1:1, increase the rotation speed of the ball mill to 600 r / min and continue to grind for 1 h to obtain mixture B, and the particle size of mixture B is 800 mesh. S3: Disperse mixture B in nano-silica sol, heat the nano-silica sol to 100 °C, and at the same time stir at a rotation speed of 180 r / min for 0.5 h, filter, and dry at 80 °C for 12 h to obtain mixed fiber C. S4: Immerse mixed fiber C in methacrylic acid, and perform ultrasonic treatment while immersing for 1 h to obtain mixed fiber D. S5: Spread mixed fiber D into a mesh structure, and dry it at room temperature in a nitrogen atmosphere to form a fiber grid. S6: Uniformly coat a layer of silicone oil with a concentration of 20% on the surface of the fiber grid, and dry it by laser drying method. The parameters of the laser drying method are laser power 300 W, temperature 60 °C, and irradiation time 3 min to obtain the high-strength fiber layer.

[0032] A preparation method of an Oxford cloth composite material. The preparation method of the composite material is as follows: Coat an adhesive on the inner sides of the Oxford cloth on the upper and lower sides. The coating amount of the adhesive is 50 g / m 2 , then bond the middle layer of modified reinforced fibers and the Oxford cloth together, let it stand for 20 min, then press both sides of the composite material with a force of 5 kN simultaneously, then transfer the composite material to 60 °C for drying treatment, cut the composite material, soak the composite material in silicone oil with a mass fraction of 10%, soften the cloth at a temperature of 40 °C for 1 h, dry it at 60 °C for 2 h, and dry it at 80 °C for 0.5 h to obtain the composite material.

[0033] Example 2 An Oxford cloth composite material, characterized in that the Oxford cloth composite material includes Oxford cloth surfaces on the upper and lower sides and a middle layer of modified reinforced fibers. The Oxford cloth surfaces and the middle layer of modified reinforced fibers are bonded by an adhesive. Among them, the preparation method of the middle layer of modified reinforced fibers is as follows: S1: Mix polypropylene fibers and aramid fibers in a mass ratio of 1:1, grind them in a ball mill at a rotation speed of 400 r / min for 2 h to obtain mixture A. The particle size of mixture A is 500 mesh; The preparation method of the adhesive is as follows: S1.1: Heat the polyurethane resin to 170 °C to make it in a molten state, add rosin resin to the polyurethane resin, and the volume ratio of the two is 5:1. While adding, stir at a rotation speed of 300 r / min for 50 min to obtain mixed resin I; S1.2: Add ethyl acetate to mixed resin I, and the volume ratio of the two is 1:4. Continue to stir at a rotation speed of 300 r / min and slowly cool down to 60 °C, then add 5 wt% azobisisobutyronitrile and stir for 1 h to obtain mixture II; S1.3: Add 5 wt% talcum powder and 1 wt% silane coupling agent KH550 to mixture II, adjust the rotation speed to 500 r / min, and stir for 20 - 30 min to obtain the adhesive; S2: Mix mixture A and carbon nanotubes in a mass ratio of 0.5:1, increase the rotation speed of the ball mill to 600 r / min and continue to grind for 1 h to obtain mixture B. The particle size of mixture B is 800 mesh; S3: Disperse mixture B in nano-silica sol, heat the nano-silica sol to 120 °C, stir at a rotation speed of 180 r / min simultaneously, and the stirring duration is 0.5 h. Filter and dry at 80 °C for 12 h to obtain mixed fiber C; S4: Immerse the mixed fiber C in methacrylic acid, and perform ultrasonic treatment during immersion. The ultrasonic duration is 1 h to obtain the mixed fiber D; S5: Spread the mixed fiber D into a network structure, and dry it at room temperature in a nitrogen atmosphere to form a fiber grid; S6: Uniformly coat a layer of silicone oil with a concentration of 30% on the surface of the fiber grid, and dry it by laser drying method. The parameters of the laser drying method are laser power 300 W, temperature 60 °C, and irradiation duration 5 min to obtain the high-strength fiber layer.

[0034] A preparation method of an Oxford cloth composite material, the composite material preparation method is as follows, Coat a layer of adhesive on the inner sides of the Oxford cloth on the upper and lower sides. The coating amount of the adhesive is 50 g / m 2 , then bond the intermediate layer modified reinforced fiber and the Oxford cloth together, let it stand for 20 min, then press both sides of the composite material simultaneously with a force of 5 kN, then transfer the composite material to 60 °C for drying treatment, cut the composite material, immerse the composite material in silicone oil with a mass fraction of 10%, perform softening treatment on the fabric, temperature 40 °C, duration 2 h, and dry it at 60 °C for 2 h and at 80 °C for 0.5 h to obtain the composite material.

[0035] Example 3 An Oxford cloth composite material, characterized in that the Oxford cloth composite material includes Oxford cloth surfaces on the upper and lower sides and an intermediate layer modified reinforced fiber, and the Oxford cloth surface and the intermediate layer modified reinforced fiber are bonded by an adhesive. Among them, the preparation method of the intermediate layer modified reinforced fiber is as follows, S1: Mix polypropylene fiber and aramid fiber according to a mass ratio of 1:2, grind them in a ball mill at a rotation speed of 400 r / min for 2 h to obtain a mixture A, and the particle size of the mixture A is 500 mesh; The preparation method of the adhesive is as follows, S1.1: Heat the polyurethane resin to 170 °C to make it in a molten state, add rosin resin to the polyurethane resin, and the volume ratio of the two is 5:1. Stir at a rotation speed of 300 r / min while adding, and the stirring duration is 30 min to obtain a mixed resin I; S1.2: Add ethyl acetate to the mixed resin I, and the volume ratio of the two is 1:4. Continuously stir at a rotation speed of 300 r / min, and slowly cool down to 60 °C, then add 10 wt% azobisisobutyronitrile, and stir for 1 h to obtain a mixture II; S1.3: Add 5 wt% talcum powder and 1 wt% silane coupling agent KH550 to the mixture II, adjust the rotation speed to 500 r / min, and stir for 2 min to obtain the adhesive; S2: Mix mixture A and carbon nanotubes in a mass ratio of 1:1, increase the rotational speed of the ball mill to 600 r / min and continue grinding for 1 h to obtain mixture B, and the particle size of mixture B is 800 mesh; S3: Disperse mixture B in nano-silica sol, heat the nano-silica sol to 70 °C, stir at the same time at a rotational speed of 180 r / min, the stirring duration is 1 h, filter, and dry at 80 °C for 12 h to obtain mixed fiber C; S4: Immerse mixed fiber C in methacrylic acid, and perform ultrasonic treatment during the immersion, the ultrasonic duration is 2 h, to obtain mixed fiber D; S5: Spread mixed fiber D into a net structure, dry it at room temperature in a nitrogen atmosphere to form a fiber grid; S6: Uniformly coat a layer of silicone oil with a concentration of 20% on the surface of the fiber grid, and dry it by laser drying method. The parameters of the laser drying method are laser power 300 W, temperature 60 °C, and irradiation duration 5 min to obtain the high-strength fiber layer.

[0036] A preparation method of an Oxford cloth composite material, the preparation method of the composite material is as follows, Coat an adhesive on the inner sides of the Oxford cloth on the upper and lower sides, the coating amount of the adhesive is 50 g / m 2 , then bond the intermediate layer modified reinforcing fiber and the Oxford cloth together, let it stand for 10 min, then press both sides of the composite material simultaneously with a force of 5 kN, then transfer the composite material to 60 °C for drying treatment, cut the composite material, immerse the composite material in silicone oil with a mass fraction of 10%, perform softening treatment on the fabric, the temperature is 40 °C, the duration is 1 h, and after the softening treatment, dry it at 60 °C for 2 h and at 80 °C for 0.5 h to obtain the composite material.

[0037] Comparative Example 1 In this comparative example, aramid fiber is not added during the preparation process of the intermediate layer modified reinforcing fiber, and the remaining steps are the same as those in Example 1.

[0038] Comparative Example 2 In this comparative example, carbon nanotubes are not added during the preparation process of the intermediate layer modified reinforcing fiber, and the remaining steps are the same as those in Example 1.

[0039] Comparative Example 3 In this comparative example, nano-silica sol is not added during the preparation process of the intermediate layer modified reinforcing fiber, and the remaining steps are the same as those in Example 1.

[0040] Comparative Example 4 In this comparative example, the immersion in methacrylic acid is not performed during the preparation process of the intermediate layer modified reinforcing fiber, and the remaining steps are the same as those in Example 1.

[0041] Comparative Example 5 In the preparation process of the intermediate layer modified reinforcing fiber in this comparative example, no surface silicone oil coating is carried out, and the remaining steps are the same as those in Example 1.

[0042] Comparative Example 6 In the preparation of the adhesive in this comparative example, no rosin resin is added, and the remaining steps are the same as those in Example 1.

[0043] Comparative Example 7 In the preparation of the adhesive in this comparative example, no azodiisobutyronitrile is added, and the remaining steps are the same as those in Example 1.

[0044] Comparative Example 8 In the preparation of the adhesive in this comparative example, no talcum powder is added, and the remaining steps are the same as those in Example 1. The strength performance of the examples and comparative examples was detected. The Oxford cloth used in the samples was 600D, and the detection was carried out with reference to the standard GB / T 3923.1 - 2013. The experimental results are summarized in the following table. It can be seen from the experimental data that the preparation of the intermediate layer modified reinforcing fiber of the present invention and the adhesive used have effectively improved the strength of the obtained Oxford composite material.

[0045] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An Oxford cloth composite material, characterized in that: The Oxford cloth composite material comprises Oxford cloth surface layers on the upper and lower sides and a middle layer of modified reinforced fibers, and the Oxford cloth surface layer and the middle layer of modified reinforced fibers are bonded by an adhesive. The preparation method of the modified reinforced fiber of the middle layer is as follows: S1: polypropylene fiber and aramid fiber were mixed in a mass ratio of 1:(1-2), and ground in a ball mill at a speed of 400 r / min for 2 h to obtain a mixture A; S2: Mix the mixture A and carbon nanotubes in a mass ratio of (0.5-1):1, increase the ball mill speed to 600 r / min and continue grinding for 1 h to obtain a mixture B; S3: Dispersing the mixture B in the nano-silica sol, heating the nano-silica sol to 70-120°C, stirring at a speed of 180 r / min for 0.5-1 h, filtering, and drying at 80°C for 12 h to obtain mixed fibers C; S4: soaking the mixed fiber C in methacrylic acid, and performing ultrasonic treatment while soaking, the ultrasonic time is 1-2 hours, to obtain mixed fiber D; S5: Spreading the mixed fiber D into a mesh structure, and drying it at room temperature in a nitrogen atmosphere to form a fiber grid; S6: uniformly coating a layer of silicone oil with a concentration of 20-30% on the surface of the fiber mesh, and drying it by a laser drying method to obtain the high-strength fiber layer.

2. The Oxford cloth composite material according to claim 1, characterized in that: The preparation method of the adhesive in S1 is as follows: S1.1: Heat the polyurethane resin to 170°C to make it molten, add rosin resin to the polyurethane resin in a volume ratio of 5:1, stir at a speed of 300 r / min while adding, and stir for 30 to 50 min to obtain mixed resin I; S1.2: Add ethyl acetate to the mixed resin I in a volume ratio of 1:4, continue stirring at a speed of 300 r / min, and slowly cool to 60°C, then add 5-10 wt% azobisisobutyronitrile, stir for 1 h, and obtain a mixture II; S1.3: Add 5 wt % talc and 1 wt % silane coupling agent KH550 to the mixture II, adjust the rotation speed to 500 r / min, and stir for 20-30 min to obtain the adhesive.

3. The Oxford cloth composite material according to claim 1, characterized in that: The particle size of the mixture A obtained by grinding in S1 is 500 mesh.

4. The Oxford cloth composite material according to claim 1, characterized in that: The particle size of the mixture B obtained by grinding in the S2 is 800 mesh.

5. The Oxford cloth composite material according to claim 1, characterized in that: The parameters of the laser drying method in S6 are: laser power 300W, temperature 60°C, and irradiation time 3~5min.

6. A method for preparing an Oxford cloth composite material, based on the Oxford cloth composite material according to any one of claims 1 to 5, characterized in that: The composite material preparation method is as follows: A layer of adhesive is applied to the inner side of the Oxford cloth on the upper and lower sides, and then the middle layer of modified reinforced fiber and the Oxford cloth are bonded together, and then allowed to stand for 10 to 20 minutes. Then, both sides of the composite material are pressed simultaneously with a force of 5 kN, and then the composite material is transferred to 60° C. for drying, and the composite material is cut, and the composite material is immersed in 10% by mass silicone oil, the cloth is softened, and the composite material is obtained after drying.

7. The method for preparing an Oxford cloth composite material according to claim 6, characterized in that: The coating amount of the adhesive is 50g / m 2 .

8. The method for preparing an Oxford cloth composite material according to claim 6, characterized in that: The softening treatment parameters are: temperature 40° C., time 1 to 2 hours.

9. The method for preparing an Oxford cloth composite material according to claim 6, characterized in that: The drying parameters are drying at 60°C for 2 hours and drying at 80°C for 0.5 hours.

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