Long-acting antibacterial automobile roof and preparation method thereof

Abstract

The invention relates to the technical field of automotive materials, and particularly discloses a long-acting antibacterial automobile roof which comprises a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer and a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet. The second non-woven fabric layer is attached to the surface of the second prefabricated fabric layer; the first prefabricated fabric layer and the second prefabricated fabric layer are both made of prefabricated fabric, and the first non-woven fabric layer and the second non-woven fabric layer are both made of non-woven fabric. The invention discloses a preparation method of the long-acting antibacterial automobile roof, which comprises the following steps: respectively coating glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, then stacking, hot-pressing for 1-2 hours at 10-14 MPa, and drying to obtain the long-acting antibacterial automobile roof. The hot pressing temperature is 105-120 DEG C;

Description

Technical Field

[0001] The invention relates to the technical field of vehicle materials, and in particular to a long-lasting antibacterial automobile roof and a preparation method thereof. Background Art

[0002] The car roof can play the role of sound insulation and heat insulation, providing a comfortable experience for the driver and passengers in the car, but the car roof interior panels in the existing technology have a single function and can no longer meet people's needs.

[0003] The antibacterial car ceiling is used to be installed on the top cover of the car sheet metal. Through the structure of antibacterial materials, it resists the reproduction of bacteria and provides a better environment in the car. At present, with the continuous increase in the number of cars, people's demand for the use of antibacterial car ceilings is gradually increasing. However, the existing antibacterial car ceilings have a short antibacterial effect and cannot meet people's needs. At the same time, the mechanical effect of the ceiling is poor, and it is very easy to be torn or broken, which needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a long-lasting antibacterial automobile roof and a preparation method thereof.

[0005] A long-lasting antibacterial automobile roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer; the layers are obtained by hot pressing after coating with glue.

[0006] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of prefabricated fabric, while the first non-woven fabric layer and the second non-woven fabric layer are both made of non-woven fabric.

[0007] Preferably, the prefabricated fabric has a thickness of 1-2 mm and a weight of 300-315 g / m 2 .

[0008] Preferably, the thickness of the nonwoven fabric is 0.2-0.4 mm and the weight is 40-60 g / m 2 .

[0009] Preferably, the thickness of the polyurethane foam sheet is 4-8 mm and the weight is 100-125 g / m2.

[0010] Preferably, the prefabricated fabric is prepared by the following steps: adding graphene oxide and chitosan to an acetic acid aqueous solution and stirring evenly, adding polyvinyl pyrrolidone thereto and stirring for 1-2 hours, adding antibacterial fabric thereto, repeating the dipping-pulling 2-5 times, each dipping for 5-10 minutes, absorbing water, drying, expanding the fabric into a flat state, and shaping to obtain the prefabricated fabric.

[0011] More preferably, the mass ratio of graphene oxide, chitosan and polyvinyl pyrrolidone is 1-2:1-2:5-10.

[0012] More preferably, the shaping treatment temperature is 180-190° C., and the shaping speed is 12-18 m / min.

[0013] More preferably, the antibacterial fabric is prepared by the following steps: adding dopamine hydrochloride and polylysine to deionized water, stirring at 40-50°C for 10-30 minutes, immersing the polyester fabric therein, adjusting the pH value of the system to 9-10, ultrasonically treating for 5-10 hours, standing for 10-20 hours, taking out, washing, and drying to obtain the pretreated polyester fabric; then dispersing the silver nanowires in an ethanol aqueous solution and stirring evenly, immersing the pretreated polyester fabric therein, repeating the immersion-pulling 2-5 times, and drying to obtain the antibacterial fabric.

[0014] More preferably, the molecular weight of poly-lysine is 70,000-150,000.

[0015] More preferably, the silver nanowires have a length of 110-130 μm and a diameter of 110-130 nm.

[0016] More preferably, the mass ratio of polyester fabric, dopamine hydrochloride, poly-lysine and silver nanowires is 10-20:5-12:1-2:1-2.

[0017] More preferably, the concentration of the sodium hydroxide solution is 1-2 mol / L.

[0018] More preferably, the ultrasound frequency is 5-10 kHz.

[0019] More preferably, the mass fraction of the ethanol aqueous solution is 40-60%, and the mass ratio of the silver nanowires to the ethanol aqueous solution is 1-2:50-100.

[0020] The preparation method of the above-mentioned long-lasting antibacterial car ceiling includes the following steps: applying glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 10-14MPa for 1-2h, and the hot pressing temperature is 105-120℃.

[0021] Preferably, the glue is water-based epoxy resin and / or water-based polyurethane resin.

[0022] Beneficial effects:

[0023] The present invention utilizes the good affinity of dopamine hydrochloride and polylysine, oxidizes dopamine hydrochloride to form nano polydopamine and deposits it in the polyester fabric structure, and dendritic polylysine is doped therein, which can significantly enhance the specific surface area of ​​the pretreated polyester fabric, increase the surface functional groups, and make it have excellent adsorption and binding effects on silver nanowires, and synergistically enhance the antibacterial performance. The cross-linked network structure formed by the compounding of graphene oxide and chitosan and polylysine not only helps the silver nanowires to bind strongly on the polyester fabric and improve the antibacterial performance, but also can still maintain the flexibility of the polyester fabric itself.

[0024] The prefabricated fabric obtained by the present invention has high surface roughness, high bursting force and tearing strength, which can improve the mechanical properties of the fabric on the one hand, and enhance the interface bonding strength between the fabric and the non-woven fabric and the polyurethane foam sheet on the other hand, so that the automobile roof is not easily burst or torn, and has excellent mechanical properties.

[0025] Experiments have shown that the invention can not only repel mosquitoes, but also has a certain inhibitory and killing effect on Escherichia coli, Staphylococcus aureus, Candida albicans, etc., and has good durability, achieving a long-lasting antibacterial effect. At the same time, it has excellent antistatic and UV resistance, is particularly suitable for automobile ceiling applications, and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a comparison chart of the bursting strength and tearing strength of the prefabricated fabrics obtained in Example 5 and Comparative Examples 1-2.

[0027] Figure 2 The figure is a comparison chart of the antibacterial properties of the automobile ceilings obtained in Example 5 and Comparative Examples 1-2.

[0028] Figure 3 This is a comparison chart of the long-term antibacterial performance of the automobile ceilings obtained in Example 5 and Comparative Examples 1-2.

[0029] Figure 4 It is a comparison chart of the antistatic performance and anti-ultraviolet performance of the automobile ceiling obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0030] The present invention will be further explained below in conjunction with specific embodiments.

[0031] Example 1

[0032] A long-lasting antibacterial automobile roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0033] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±0.1mm and a gram weight of 300g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 40g / m 2 The thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 100g / m 2 .

[0034] The prefabricated fabric was prepared by the following steps: 1 kg of graphene oxide and 1 kg of chitosan were added to 50 kg of 0.5 mol / L acetic acid aqueous solution and stirred evenly, 5 kg of polyvinyl pyrrolidone was added thereto, and stirred at a speed of 100 r / min for 1 hour, 10 kg of antibacterial fabric was added thereto, and the dipping-pulling was repeated twice, with each dipping time of 5 minutes, and water was vacuum-absorbed by a water squeezer, dried by a dryer, and the fabric was expanded into a flat state by a width-opening machine, and was shaped at a temperature of 180°C with a shaping speed of 12 m / min.

[0035] The antibacterial fabric used is prepared by the following steps: 5kg of dopamine hydrochloride with a molecular weight of 70000-150000 and 1kg of polylysine are added to 100kg of deionized water, stirred at a temperature of 40°C for 10min at a stirring speed of 100r / min, 10kg of polyester fabric is immersed therein, the pH value of the system is adjusted to 9-10 with a concentration of 1mol / L sodium hydroxide solution, ultrasonic treatment is performed for 5h at an ultrasonic frequency of 5kHz, and the fabric is allowed to stand for 10h. After being taken out, it is washed once with deionized water and freeze-dried to obtain the pretreated polyester fabric; 1kg of silver nanowires with a length of 110-130μm and a diameter of 110-130nm are dispersed in 50kg of an ethanol aqueous solution with a mass fraction of 40%, stirred evenly, the pretreated polyester fabric is immersed therein, the dipping-pulling is repeated twice, and the fabric is dried at a temperature of 60°C.

[0036] The preparation method of the above-mentioned long-lasting antibacterial car ceiling includes the following steps: applying water-based epoxy resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 10MPa for 1h, and the hot pressing temperature is 105°C.

[0037] Example 2

[0038] A long-lasting antibacterial automobile roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0039] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±0.1mm and a gram weight of 315g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 60g / m 2 The thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 125g / m 2 .

[0040] The prefabricated fabric was prepared by the following steps: 2 kg of graphene oxide and 2 kg of chitosan were added to 100 kg of 1.5 mol / L acetic acid aqueous solution and stirred evenly, 10 kg of polyvinyl pyrrolidone was added thereto, and stirred at a speed of 500 r / min for 2 h, 20 kg of antibacterial fabric was added thereto, and the dipping-pulling was repeated 5 times, each dipping time was 10 min, water was vacuum-absorbed by a water squeezer, dried by a dryer, and the fabric was expanded into a flat state by a width-opening machine, and was shaped at a temperature of 190°C and a shaping speed of 18 m / min.

[0041] The antibacterial fabric used is prepared by the following steps: 12kg of dopamine hydrochloride with a molecular weight of 70000-150000 and 2kg of polylysine are added to 200kg of deionized water, stirred at a temperature of 50°C for 30min, and a stirring speed of 500r / min, immersing 20kg of polyester fabric therein, adjusting the pH value of the system to 9-10 with a concentration of 2mol / L sodium hydroxide solution, ultrasonically treating for 10h, the ultrasonic frequency is 10kHz, standing for 20h, taking out and washing with deionized water for 3 times, freeze-drying to obtain the pretreated polyester fabric; 2kg of silver nanowires with a length of 110-130μm and a diameter of 110-130nm are dispersed in 100kg of an ethanol aqueous solution with a mass fraction of 60%, stirred evenly, and the pretreated polyester fabric is immersed therein, the dipping-pulling is repeated 5 times, and dried at a temperature of 70°C.

[0042] The preparation method of the above-mentioned long-lasting antibacterial car ceiling includes the following steps: applying water-based epoxy resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 14MPa for 2h, and the hot pressing temperature is 120°C.

[0043] Example 3

[0044] A long-lasting antibacterial automobile roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0045] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±0.1mm and a gram weight of 305g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 55g / m 2 Non-woven fabric; the thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 105g / m 2 .

[0046] The prefabricated fabric was prepared by the following steps: 1.7 kg of graphene oxide and 1.2 kg of chitosan were added to 90 kg of 0.8 mol / L acetic acid aqueous solution and stirred evenly, 9 kg of polyvinyl pyrrolidone was added thereto, and the mixture was stirred at a speed of 200 r / min for 100 min, 12 kg of antibacterial fabric was added thereto, and the dipping-pulling was repeated 3 times, each dipping time was 9 min, water was vacuum-absorbed by a water squeezer, dried by a dryer, and the fabric was expanded into a flat state by a width-opening machine, and was shaped at a temperature of 182°C, and a shaping speed of 16 m / min.

[0047] The antibacterial fabric used is prepared by the following steps: 8kg of dopamine hydrochloride with a molecular weight of 70000-150000 and 1.7kg of polylysine are added to 120kg of deionized water, stirred at a temperature of 48°C for 15min, and a stirring speed of 400r / min, 12kg of polyester fabric is immersed therein, and a sodium hydroxide solution with a concentration of 1.7mol / L is used to adjust the pH value of the system to 9-10, ultrasonic treatment is performed for 7h, the ultrasonic frequency is 9kHz, and it is allowed to stand for 12h. After being taken out, it is washed twice with deionized water and freeze-dried to obtain a pretreated polyester fabric; 1.7kg of silver nanowires with a length of 110-130μm and a diameter of 110-130nm are dispersed in 70kg of an ethanol aqueous solution with a mass fraction of 55%, stirred evenly, and the pretreated polyester fabric is immersed therein, the dipping-pulling is repeated 3 times, and it is dried at a temperature of 66°C.

[0048] The preparation method of the above-mentioned long-lasting antibacterial car ceiling includes the following steps: applying water-based polyurethane resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 11 MPa for 100 minutes, and the hot pressing temperature is 110°C.

[0049] Example 4

[0050] A long-lasting antibacterial automobile roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0051] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±0.1mm and a gram weight of 310g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 45g / m 2 The thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 120g / m 2 .

[0052] The prefabricated fabric was prepared by the following steps: 1.3 kg of graphene oxide and 1.8 kg of chitosan were added to 70 kg of 1.2 mol / L acetic acid aqueous solution and stirred evenly, 7 kg of polyvinyl pyrrolidone was added thereto, and the mixture was stirred at a speed of 400 r / min for 80 min, 18 kg of antibacterial fabric was added thereto, and the dipping-pulling was repeated 4 times, with each dipping time of 7 min, water was vacuum-absorbed by a water squeezer, dried by a dryer, and the fabric was expanded into a flat state by a width-opening machine, and was shaped at a temperature of 188°C with a shaping speed of 14 m / min.

[0053] The antibacterial fabric used is prepared by the following steps: 10kg of dopamine hydrochloride with a molecular weight of 70000-150000 and 1.3kg of polylysine are added to 180kg of deionized water, stirred at a temperature of 42°C for 25min at a stirring speed of 200r / min, 18kg of polyester fabric is immersed therein, the pH value of the system is adjusted to 9-10 with a concentration of 1.3mol / L sodium hydroxide solution, ultrasonic treatment is performed for 9h at an ultrasonic frequency of 6kHz, and the fabric is allowed to stand for 18h. After being taken out, it is washed twice with deionized water and freeze-dried to obtain the pretreated polyester fabric; 1.3kg of silver nanowires with a length of 110-130μm and a diameter of 110-130nm are dispersed in 90kg of an ethanol aqueous solution with a mass fraction of 45%, stirred evenly, the pretreated polyester fabric is immersed therein, the dipping-pulling is repeated 4 times, and the fabric is dried at a temperature of 64°C.

[0054] The preparation method of the above-mentioned long-lasting antibacterial car ceiling includes the following steps: applying water-based polyurethane resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 13MPa for 80min, and the hot pressing temperature is 115°C.

[0055] Example 5

[0056] A long-lasting antibacterial automobile roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0057] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±mm and a gram weight of 307g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 50g / m 2 The thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 116g / m 2 .

[0058] The prefabricated fabric was prepared by the following steps: 1.5 kg of graphene oxide and 1.5 kg of chitosan were added to 80 kg of 1 mol / L acetic acid aqueous solution and stirred evenly, 8 kg of polyvinyl pyrrolidone was added thereto, and the mixture was stirred at a speed of 300 r / min for 90 min, 15 kg of antibacterial fabric was added thereto, and the dipping-pulling was repeated 4 times, with each dipping time of 8 min, water was vacuum-absorbed by a water squeezer, dried by a dryer, and the fabric was expanded into a flat state by a width-opening machine, and was shaped at a temperature of 185°C with a shaping speed of 15 m / min.

[0059] The antibacterial fabric used is prepared by the following steps: 9 kg of dopamine hydrochloride with a molecular weight of 70000-150000 and 1.5 kg of polylysine are added to 150 kg of deionized water, stirred at a temperature of 45 ° C for 20 minutes, and a stirring speed of 300 r / min, 15 kg of polyester fabric is immersed therein, and a 1.5 mol / L sodium hydroxide solution is used to adjust the pH value of the system to 9-10, ultrasonic treatment is performed for 8 hours, the ultrasonic frequency is 7.5 kHz, and it is allowed to stand for 15 hours. After being taken out, it is washed twice with deionized water and freeze-dried to obtain a pretreated polyester fabric; 1.5 kg of silver nanowires with a length of 110-130 μm and a diameter of 110-130 nm are dispersed in 80 kg of an ethanol aqueous solution with a mass fraction of 50%, stirred evenly, and the pretreated polyester fabric is immersed therein, and the dipping-pulling is repeated 4 times, and dried at a temperature of 65 ° C.

[0060] The preparation method of the above-mentioned long-lasting antibacterial car ceiling includes the following steps: applying water-based epoxy resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 12MPa for 90min, and the hot pressing temperature is 112°C.

[0061] Comparative Example 1

[0062] A car roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0063] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±0.1mm and a gram weight of 267g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 50g / m 2 The thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 116g / m 2 .

[0064] The prefabricated fabric was prepared by the following steps: 1.5 kg of graphene oxide and 1.5 kg of chitosan were added to 80 kg of 1 mol / L acetic acid aqueous solution and stirred evenly, 8 kg of polyvinyl pyrrolidone was added thereto, and the mixture was stirred at a speed of 300 r / min for 90 min, 15 kg of antibacterial fabric was added thereto, and the dipping-pulling was repeated 4 times, with each dipping time of 8 min, water was vacuum-absorbed by a water squeezer, dried by a dryer, and the fabric was expanded into a flat state by a width-opening machine, and was shaped at a temperature of 185°C with a shaping speed of 15 m / min.

[0065] The antibacterial fabric used was prepared by the following steps: 1.5 kg of silver nanowires with a length of 110-130 μm and a diameter of 110-130 nm were dispersed in 80 kg of 50% ethanol aqueous solution and stirred evenly, polyester fabric was immersed in it, the immersion-pulling was repeated 4 times, and the fabric was dried at a temperature of 65°C.

[0066] The preparation method of the above-mentioned automobile roof includes the following steps: applying water-based epoxy resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 12MPa for 90min, and the hot pressing temperature is 112°C.

[0067] Comparative Example 2

[0068] A car roof comprises: a first prefabricated fabric layer, a first non-woven fabric layer attached to the surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to the surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to the surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to the surface of the second prefabricated fabric layer.

[0069] The first prefabricated fabric layer and the second prefabricated fabric layer are both made of materials with a thickness of 1.5±0.1mm and a gram weight of 302g / m 2 The first non-woven fabric layer and the second non-woven fabric layer are made of materials with a thickness of 0.3±0.05mm and a gram weight of 50g / m 2 The thickness of the polyurethane foam sheet is 6±0.5mm and the weight is 116g / m 2 .

[0070] The prefabricated fabric is prepared by the following steps: 1.5 kg of graphene oxide, 1.5 kg of chitosan, and 1.5 kg of silver nanowires with a length of 110-130 μm and a diameter of 110-130 nm are added to 80 kg of 1 mol / L acetic acid aqueous solution and stirred evenly, 8 kg of polyvinyl pyrrolidone is added thereto, and the mixture is stirred at a speed of 300 r / min for 90 min, 15 kg of pretreated polyester fabric is added thereto, and the dipping-pulling is repeated 4 times, with each dipping time of 8 min, water is vacuum-absorbed by a water squeezer, and dried by a dryer. The fabric is expanded into a flat state by a width-opening machine, and is shaped at a temperature of 185° C., and a shaping speed of 15 m / min.

[0071] The pretreated polyester fabric used was prepared by the following steps: 9 kg of dopamine hydrochloride with a molecular weight of 70,000-150,000 and 1.5 kg of polylysine were added to 150 kg of deionized water, stirred at 45°C for 20 minutes at a stirring speed of 300 r / min, 15 kg of polyester fabric was immersed therein, the pH value of the system was adjusted to 9-10 with a 1.5 mol / L sodium hydroxide solution, ultrasonically treated for 8 hours at a frequency of 7.5 kHz, allowed to stand for 15 hours, taken out, washed twice with deionized water, and freeze-dried.

[0072] The preparation method of the above-mentioned automobile roof includes the following steps: applying water-based epoxy resin glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 12MPa for 90min, and the hot pressing temperature is 112°C.

[0073] The prefabricated fabrics obtained in Example 5 and Comparative Examples 1-2 were measured with reference to GB / T 19976-2005 "Determination of bursting strength of textiles - Steel ball method"; the prefabricated fabrics obtained in Example 5 and Comparative Examples 1-2 were measured with reference to GB / T 3917.1-2009 "Tear properties of textile fabrics - Part 1: Determination of tear strength by impact pendulum method".

[0074] like Figure 1 As shown, the bursting strength and tearing strength of the prefabricated fabrics obtained in Example 5 and Comparative Example 2 are better than those in Comparative Example 1 (P < 0.05), but there is no significant difference between Example 5 and Comparative Example 2 (P > 0.05).

[0075] The automobile ceilings obtained in Example 5 and Comparative Examples 1-2 were cut and sampled, and the antibacterial properties of each group of samples were tested with reference to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", and the test bacteria used were Escherichia coli (AATCC 29522), Staphylococcus aureus (AATCC 6538) and Candida albicans (ATCC 10231).

[0076] The long-term antibacterial performance of each group of samples was tested, and the water washing method was used for accelerated evaluation. Refer to 10.1.1 Washing color fastness test machine washing method in GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method" to wash 50 times, and then the antibacterial performance test was carried out again.

[0077] like Figure 2 and Figure 3 As shown, the initial antibacterial rates of the samples in each group were similar, lacking significant differences (P>0.05). However, after the accelerated washing test, it was found that the antibacterial rate of the automobile ceiling sample obtained in Example 5 was significantly better than that of Comparative Examples 1-2 (P<0.05), confirming that the automobile ceiling obtained in Example 5 can achieve a long-term antibacterial effect.

[0078] The applicant believes that this is because the present invention utilizes the good affinity of dopamine hydrochloride and polylysine, oxidizes dopamine hydrochloride to form nano-polydopamine and deposits it in the polyester fabric structure, and the dendritic polylysine is doped therein, which can significantly enhance the specific surface area of ​​the pretreated polyester fabric, increase the surface functional groups, and make it adsorb and bind to silver nanowires very well, and synergistically enhance the antibacterial properties. The compounding of graphene oxide and chitosan with polylysine forms a cross-linked network structure, which not only helps the silver nanowires to bind strongly on the polyester fabric and improve the antibacterial properties, but also can still maintain the flexibility of the polyester fabric itself. The prefabricated fabric obtained by the present invention has high surface roughness, high bursting force and tear strength, which can improve the mechanical properties of the fabric on the one hand, and enhance the interface bonding strength between it and the non-woven fabric and the polyurethane foam sheet on the other hand, so that the car roof is not easy to be broken or torn, and has excellent mechanical properties.

[0079] The automobile ceiling samples obtained in Example 5 and Comparative Examples 1-2 were tested with reference to GB / T 12703.1-2008 "Evaluation of electrostatic properties of textiles Part 1: Half-life of static voltage", and the test conditions were: temperature 20°C, relative humidity 35%. The anti-ultraviolet effects of the automobile ceiling samples obtained in Example 5 and Comparative Examples 1-2 were tested with reference to GB / T 18830-2009 "Evaluation of anti-ultraviolet properties of textiles".

[0080] like Figure 4 As shown, the antistatic performance and anti-ultraviolet performance of the automobile ceiling obtained in Example 5 are better than those of Comparative Examples 1-2 (P < 0.05), which proves that the automobile ceiling obtained in the present invention has excellent antistatic and anti-ultraviolet performance.

[0081] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A long-lasting antibacterial car roof, characterized in that: include: a first prefabricated fabric layer, a first non-woven fabric layer attached to a surface of the first prefabricated fabric layer, a polyurethane foam sheet attached to a surface of the first non-woven fabric layer, a second prefabricated fabric layer attached to a surface of the polyurethane foam sheet, and a second non-woven fabric layer attached to a surface of the second prefabricated fabric layer; The first prefabricated fabric layer and the second prefabricated fabric layer are both made of prefabricated fabric, while the first non-woven fabric layer and the second non-woven fabric layer are both made of non-woven fabric.

2. The long-lasting antibacterial automobile ceiling according to claim 1 is characterized in that: The thickness of the prefabricated fabric is 1-2mm and the weight is 300-315g / m 2 .

3. The long-lasting antibacterial automobile ceiling according to claim 1 is characterized in that: The thickness of non-woven fabric is 0.2-0.4mm and the weight is 40-60g / m 2 .

4. The long-lasting antibacterial automobile ceiling according to claim 1 is characterized in that: The thickness of the polyurethane foam sheet is 4-8mm and the weight is 100-125g / m2.

5. The long-lasting antibacterial automobile ceiling according to claim 1 is characterized in that: The prefabricated fabric is prepared by the following steps: adding graphene oxide and chitosan to an acetic acid aqueous solution and stirring evenly, adding polyvinyl pyrrolidone thereto and stirring for 1-2 hours, adding antibacterial fabric thereto, repeating the dipping-pulling for 2-5 times, dipping for 5-10 minutes each time, absorbing water, drying, expanding the fabric into a flat state, and shaping to obtain the prefabricated fabric.

6. The long-lasting antibacterial automobile ceiling according to claim 5, characterized in that: The mass ratio of graphene oxide, chitosan and polyvinyl pyrrolidone is 1-2:1-2:5-10.

7. The long-lasting antibacterial automobile ceiling according to claim 5, characterized in that: The shaping treatment temperature is 180-190°C, and the shaping speed is 12-18m / min.

8. The long-lasting antibacterial automobile ceiling according to claim 5, characterized in that: The antibacterial fabric is prepared by the following steps: dopamine hydrochloride and polylysine are added to deionized water, stirred at 40-50°C for 10-30 minutes, polyester fabric is immersed therein, the pH value of the system is adjusted to 9-10, ultrasonic treatment is performed for 5-10 hours, the fabric is allowed to stand for 10-20 hours, the fabric is taken out for washing, and the pretreated polyester fabric is dried to obtain the pretreated polyester fabric; then, the silver nanowires are dispersed in an ethanol aqueous solution and stirred evenly, the pretreated polyester fabric is immersed therein, the dipping-pulling is repeated 2-5 times, and the antibacterial fabric is dried to obtain the antibacterial fabric.

9. The long-lasting antibacterial automobile ceiling according to claim 8, characterized in that: The molecular weight of polylysine is 70000-150000; the length of the silver nanowire is 110-130 μm, and the diameter is 110-130 nm; and the mass ratio of polyester fabric, dopamine hydrochloride, polylysine, and silver nanowire is 10-20:5-12:1-2:1-2.

10. A method for preparing the long-lasting antibacterial automobile ceiling according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: applying glue between the first prefabricated fabric layer and the first non-woven fabric layer, between the first non-woven fabric layer and the polyurethane foam sheet, between the polyurethane foam sheet and the second prefabricated fabric layer, and between the second prefabricated fabric layer and the second non-woven fabric layer, respectively, and then stacking, hot pressing at 10-14 MPa for 1-2 hours, and the hot pressing temperature is 105-120°C.

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