Anti-electromagnetic radiation automobile foot mat and production method thereof

Abstract

The invention relates to the technical field of automobile foot mats, in particular to an anti-electromagnetic radiation automobile foot mat and a production method thereof. The preparation method comprises the following steps: mixing 4, 4-diphenylmethane diisocyanate, polyethylene glycol 2000, 1, 4-butanediol, a flame retardant and modified graphene to prepare a polyurethane emulsion; wherein the modified graphene is obtained by modifying graphene oxide with 3-glycidyl ether oxypropyl trimethoxy silane, and the flame retardant is obtained by reacting vanillin with phosphorus oxychloride to obtain an intermediate and then sequentially reacting with ethanolamine and melamine. Coating release paper with the polyurethane emulsion, drying the release paper, laminating the release paper with carbon fiber cloth, and performing lamination, curing and cooling to obtain surface leather; taking the base cloth, sequentially superposing the buffer layer and the surface leather on the upper surface of the base cloth, and gluing and compounding to obtain the anti-electromagnetic radiation foot pad. The prepared automobile foot mat is good in performance and meets daily application requirements.

Description

Technical Field

[0001] The invention relates to the technical field of automobile foot pads, in particular to an electromagnetic radiation protection automobile foot pad and a production method thereof. Background Art

[0002] As a car interior component, car floor mats not only have the protective functions of absorbing water, dust, anti-fouling and sound insulation, but also effectively prevent the driver's feet from sliding on the clutch, brake and accelerator due to residual moisture and dirt on the soles, thus avoiding safety hazards. At the same time, they can also keep the interior of the car clean and beautiful and avoid pollution of the interior environment.

[0003] In recent years, with the continuous development of new energy vehicles, the use of electric vehicles has increased. As a large-scale electronic and electromechanical equipment, electric vehicles integrate electronic controllers, inverters, batteries, motors and other components, so the electromagnetic environment inside the car is very complex; for new energy vehicle drivers, long-term exposure to electromagnetic environments may cause biochemical or physicochemical effects on body tissues, causing damage to normal physiological functions, and in severe cases may cause temporary or permanent pathological conditions in the body. Therefore, it is necessary to develop an anti-electromagnetic radiation car mat to protect against the electromagnetic radiation generated in the above scenarios. Summary of the invention

[0004] The object of the present invention is to provide an electromagnetic radiation protection car mat and a production method thereof, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: The polyurethane emulsion is coated on the release paper, and then dried and laminated with the carbon fiber cloth. After lamination and aging, it is cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface thereof, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0006] Furthermore, the coating amount of the polyurethane emulsion on the release paper is 180~240g / m 2 .

[0007] Furthermore, the preparation method of the polyurethane emulsion is: under nitrogen protection, 4,4-diphenylmethane diisocyanate is dispersed in N,N-dimethylformamide, polyethylene glycol 2000 and stannous octoate are added, the temperature is raised to 70-80°C and the reaction is carried out for 3-4 hours, 1,4-butanediol, flame retardant and modified graphene are added and the reaction is continued for 1-2 hours to obtain the polyurethane emulsion.

[0008] Furthermore, the amount of each component, by weight, is 240-260 parts of 4,4-diphenylmethane diisocyanate, 700-750 parts of polyethylene glycol 2000, 5-10 parts of stannous octoate, 50-90 parts of 1,4-butanediol, 100-120 parts of flame retardant, and 50-80 parts of modified graphene.

[0009] Furthermore, the preparation method of the flame retardant comprises the following steps: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 60-70°C for 20-24h, filter the product, wash with saturated brine, concentrate, and recrystallize to obtain an intermediate; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, raise the temperature to 50-60°C and react for 3-5 hours. After the reaction is completed, add melamine and continue to react for 2-3 hours to obtain a flame retardant.

[0010] Furthermore, it is characterized in that: in S1, the molar ratio of vanillin to phosphorus oxychloride is 3:1.

[0011] Furthermore, in S2, the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1.

[0012] Furthermore, the preparation method of modified graphene is: dispersing graphene oxide in N-methylpyrrolidone, adding 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion for 30 minutes, stirring for 2 to 3 hours, and then heating to 100 to 110°C to react for 2 to 3 hours, cooling and filtering with a 0.2 to 0.5 μm polytetrafluoroethylene membrane, washing the obtained solid with ethanol, and drying to obtain modified graphene.

[0013] Furthermore, the base fabric is polyester needle-punched fabric, and the buffer layer is polyurethane foam plastic.

[0014] Compared with the prior art, the beneficial effect achieved by the present invention is that: the present invention improves a method for preparing an electromagnetic radiation-proof car mat. The present invention prepares a car mat surface leather by laminating polyurethane leather with carbon fiber cloth, and the base cloth, the buffer layer, and the surface leather are bonded and compounded to obtain an electromagnetic radiation-proof car mat.

[0015] In the present invention, since carbon fiber has electromagnetic shielding ability, the automobile floor mat is endowed with good anti-electromagnetic radiation performance. When preparing polyurethane leather, the present invention mixes 4,4-diphenylmethane diisocyanate, polyethylene glycol 2000, 1,4-butanediol, flame retardant, and modified graphene. The modified graphene is obtained by modifying graphene oxide with 3-glycidyloxypropyltrimethoxysilane, which improves the anti-electromagnetic radiation performance of polyurethane leather and enhances the mechanical properties.

[0016] The present invention uses vanillin as a carbon source, phosphorus oxychloride as a phosphorus source, and melamine as a nitrogen source to prepare a flame retardant, specifically: phosphorus oxychloride and vanillin are reacted in a molar ratio of 1:3 to obtain an intermediate, and then the intermediate is reacted with ethanolamine and melamine in a massage ratio of 1:2:1 in sequence through a Schiff base reaction. The flame retardant contains two hydroxyl groups and two amine groups, both of which can react with the isocyanate groups in the polyurethane, thereby improving the crosslinking degree of the polyurethane leather. In addition, the amine groups in the flame retardant can also react with the epoxy groups on the modified graphene, and the graphene oxide is organically combined with the polyurethane by means of chemical bonds, thereby further improving the dispersibility of the graphene and improving the modification effect of the graphene on the polyurethane leather.

[0017] In addition, it should be noted that when preparing the flame retardant, the reaction order of the intermediate obtained by the reaction of phosphorus oxychloride and vanillin cannot be changed when reacting with ethanolamine and melamine. The reasons are as follows: the intermediate contains three reactive aldehyde groups, and melamine contains three reactive amine groups. If the intermediate is reacted with melamine first, the two will undergo a polymerization reaction to generate a macromolecular polymer. The macromolecular polymer has poor compatibility with polyurethane, so the modification effect is poor. In the present invention, the intermediate is first reacted with ethanolamine in a molar ratio of 1:2, and the product after the reaction contains only one reactive aldehyde group. It is then reacted with melamine. At this time, due to the excess of amine groups, there is no need to be careful about the polymerization reaction. Therefore, the obtained product is a small molecule flame retardant. DETAILED DESCRIPTION

[0018] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0019] Materials and sources used in the present invention: graphene oxide comes from Changzhou Sixth Element Materials Technology Co., Ltd., model SE2431; the buffer layer is polyurethane foam plastic with a thickness of 8.0 mm and a gram weight of 270 g / m³, which comes from Guangzhou Hongcheng Plastic Co., Ltd.; the base fabric is polyester needle-punched fabric with a thickness of 2.0 mm and a gram weight of 120 g / m³, which comes from Dongguan Zhicheng Fiber Products Co., Ltd.

[0020] Embodiment 1: An electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min. After stirring for 2 h, the mixture was heated to 100 °C and reacted for 2 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene. Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 60°C for 24 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 50°C and react for 3 hours, add melamine after the reaction is completed and continue to react for 2 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 70°C for reaction for 3 h, 80 g of 1,4-butanediol, 50 g of flame retardant and 50 g of modified graphene were added and the reaction was continued for 1 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0021] Embodiment 2: An electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min, and then the mixture was stirred for 2.5 h and then heated to 105° C. for reaction for 2.5 h. After cooling, the mixture was filtered through a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene; Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 65°C for 22 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 55°C and react for 4 hours, add melamine after the reaction is completed and continue to react for 2.5 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 75°C and the reaction was continued for 3.5 h, 80 g of 1,4-butanediol, 70 g of flame retardant and 60 g of modified graphene were added and the reaction was continued for 1.5 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0022] Embodiment 3: An electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min, and then heated to 110° C. for reaction for 3 h after stirring for 3 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene; Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 70°C for 24 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 60°C and react for 5 hours, add melamine after the reaction is completed and continue to react for 3 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 80°C for reaction for 4 h, 80 g of 1,4-butanediol, 80 g of flame retardant and 70 g of modified graphene were added and the reaction continued for 2 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0023] Embodiment 4: An electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min, and then heated to 110° C. for reaction for 3 h after stirring for 3 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene; Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 70°C for 24 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 60°C and react for 5 hours, add melamine after the reaction is completed and continue to react for 3 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 80°C for reaction for 4 h, 80 g of 1,4-butanediol, 90 g of flame retardant and 80 g of modified graphene were added and the reaction continued for 2 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0024] Embodiment 5: An electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min, and then heated to 110° C. for reaction for 3 h after stirring for 3 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene; Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 70°C for 24 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 60°C and react for 5 hours, add melamine after the reaction is completed and continue to react for 3 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 80°C for reaction for 4 h, 80 g of 1,4-butanediol, 90 g of flame retardant and 80 g of modified graphene were added and the reaction continued for 2 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 200g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0025] Embodiment 6: An electromagnetic radiation protection car mat and a production method thereof, comprising the following steps: Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min, and then heated to 110° C. for reaction for 3 h after stirring for 3 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene; Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 70°C for 24 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 60°C and react for 5 hours, add melamine after the reaction is completed and continue to react for 3 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 80°C for reaction for 4 h, 80 g of 1,4-butanediol, 90 g of flame retardant and 80 g of modified graphene were added and the reaction continued for 2 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 240g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0026] Comparative Example 1: No flame retardant was added, and other parameters were the same as those in Example 1.

[0027] Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min. After stirring for 2 h, the mixture was heated to 100 °C and reacted for 2 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene. Step 2: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 70°C for reaction for 3 h, 80 g of 1,4-butanediol, 50 g of flame retardant and 50 g of modified graphene were added and the reaction was continued for 1 h to obtain a polyurethane emulsion; Step 3: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0028] Comparative Example 2: The graphene was not modified, and the other parameters were the same as those in Example 2.

[0029] Step 1: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 65°C for 22 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, heat to 55°C and react for 4 hours, add melamine after the reaction is completed and continue to react for 2.5 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, ethanolamine and melamine is 1:2:1; Step 2: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 75°C and the reaction was continued for 3.5 h, 80 g of 1,4-butanediol, 70 g of flame retardant and 60 g of modified graphene were added and the reaction was continued for 1.5 h to obtain a polyurethane emulsion; Step 3: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0030] Comparative Example 3: When preparing the flame retardant, the reaction sequence of the intermediate with ethanolamine and melamine was changed, and the other parameters were the same as those in Example 3.

[0031] Step 1: 0.5 g of graphene oxide was dispersed in N-methylpyrrolidone, and then 5 g of 3-glycidyloxypropyltrimethoxysilane was added after ultrasonic dispersion for 30 min, and then heated to 110° C. for reaction for 3 h after stirring for 3 h. After cooling, the mixture was filtered with a 0.2 μm polytetrafluoroethylene membrane, and the obtained solid was washed with ethanol and dried to obtain modified graphene; Step 2: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate respectively to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 70°C for 24 hours, filter the product, wash it with saturated brine, concentrate it, and recrystallize it to obtain an intermediate; wherein the molar ratio of vanillin to phosphorus oxychloride is 3:1; S2: dispersing the intermediate in 1,4-dioxane, adding melamine under nitrogen protection, heating to 60°C for reaction for 5 hours, adding ethanolamine after the reaction is completed and continuing the reaction for 3 hours to obtain a flame retardant; wherein the molar ratio of the intermediate, melamine and ethanolamine is 1:2:1; Step 3: Under nitrogen protection, 240 g of 4,4-diphenylmethane diisocyanate was dispersed in N,N-dimethylformamide, 700 g of polyethylene glycol 2000 and 5 g of stannous octoate were added, the temperature was raised to 80°C for reaction for 4 h, 80 g of 1,4-butanediol, 80 g of flame retardant and 70 g of modified graphene were added and the reaction continued for 2 h to obtain a polyurethane emulsion; Step 4: Apply polyurethane emulsion on release paper with a coating amount of 180g / m 2 After drying, it is bonded with carbon fiber cloth, laminated and aged, cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

[0032] Experiment: The electromagnetic radiation protection foot pads prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were tested.

[0033] Flame retardant performance test: The performance test is carried out using the limiting oxygen index.

[0034] Anti-electromagnetic performance: The internationally commonly used bow method is used for measurement, the test frequency range is 2~18GHZ, each sample is measured 3 times on the front side, and the average value is calculated; the reflectivity dB is a negative value, the smaller the dB value, the better the absorbing performance; the larger the dB value, the worse the absorbing performance.

[0035] Tensile strength test: refer to GB / T6344-2008 standard test.

[0036] Peel strength test: Refer to GB / T8949-2009 standard to test the peel strength between carbon fiber cloth and polyurethane leather.

[0037] The experimental results are shown in Table 1.

[0038] Table 1. Test results of various properties of anti-electromagnetic radiation car mats

[0039] Conclusion: The data of Examples 1 to 4 show that the car mats prepared by the present invention have good properties, including excellent flame retardancy, anti-electromagnetic radiation performance, and mechanical properties. The data of Example 1 and Comparative Example 1 show that after adding the flame retardant, the polyurethane upper leather has good flame retardancy; in addition, the flame retardant improves the cross-linking performance of the polyurethane, so the mechanical properties of the upper leather are improved. The data of Example 2 and Comparative Example 2 show that after the graphene is modified, the dispersion of the graphene is better, so the anti-electromagnetic radiation effect and mechanical properties of the car mats are improved. The data of Example 3 and Comparative Example 3 show that when preparing the flame retardant, if the reaction order of the intermediate with ethanolamine and melamine is changed to prepare the flame retardant, the effect of the obtained flame retardant in the polyurethane upper leather is not good.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for producing an electromagnetic radiation protection car mat, characterized in that: The following steps are involved: The polyurethane emulsion is coated on the release paper, and then dried and laminated with the carbon fiber cloth. After lamination and aging, it is cooled and the release paper is peeled off to obtain the surface leather; the base fabric is taken, and the buffer layer and the surface leather are sequentially superimposed on the upper surface thereof, and adhesively compounded to obtain the electromagnetic radiation protection foot pad.

2. The method for producing an electromagnetic radiation protection car mat according to claim 1, characterized in that: The coating amount of polyurethane emulsion on release paper is 180~240g / m 2 .

3. The method for producing an electromagnetic radiation protection car mat according to claim 1, characterized in that: The preparation method of the polyurethane emulsion is as follows: under nitrogen protection, 4,4-diphenylmethane diisocyanate is dispersed in N,N-dimethylformamide, polyethylene glycol 2000 and stannous octoate are added, the temperature is raised to 70-80°C for reaction for 3-4 hours, 1,4-butanediol, flame retardant and modified graphene are added and the reaction is continued for 1-2 hours to obtain the polyurethane emulsion.

4. The method for producing an electromagnetic radiation protection car mat according to claim 3, characterized in that: The amount of each component, by weight, is 240-260 parts of 4,4-diphenylmethane diisocyanate, 700-750 parts of polyethylene glycol 2000, 5-10 parts of stannous octoate, 60-80 parts of 1,4-butanediol, 50-90 parts of flame retardant, and 50-80 parts of modified graphene.

5. The method for producing an electromagnetic radiation protection car mat according to claim 3, characterized in that: The method for preparing a flame retardant comprises the following steps: S1: Disperse vanillin and phosphorus oxychloride in ethyl acetate to obtain corresponding solutions; use triethylamine as an acid-binding agent, add the phosphorus oxychloride solution to the vanillin solution under nitrogen protection at 0°C, react at 60-70°C for 20-24h, filter the product, wash with saturated brine, concentrate, and recrystallize to obtain an intermediate; S2: Disperse the intermediate in 1,4-dioxane, add ethanolamine under nitrogen protection, raise the temperature to 50-60°C and react for 3-5 hours. After the reaction is completed, add melamine and continue to react for 2-3 hours to obtain a flame retardant.

6. The method for producing an electromagnetic radiation protection car mat according to claim 5, characterized in that: In S1, the molar ratio of vanillin to phosphorus oxychloride is 3:

1.

7. The method for producing an electromagnetic radiation protection car mat according to claim 5, characterized in that: In S2, the molar ratio of the intermediate, ethanolamine and melamine is 1:2:

1.

8. The method for producing an electromagnetic radiation protection car mat according to claim 3, characterized in that: The preparation method of modified graphene is as follows: dispersing graphene oxide in N-methylpyrrolidone, adding 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion for 30 minutes, stirring for 2-3 hours and then heating to 100-110°C to react for 2-3 hours, filtering with a 0.2-0.5 μm polytetrafluoroethylene membrane after cooling, washing the obtained solid with ethanol, and drying to obtain modified graphene.

9. The method for producing an electromagnetic radiation protection car mat according to claim 1, characterized in that: The base fabric is polyester and the cushioning layer is polyurethane foam.

10. An electromagnetic radiation protection car floor mat prepared by the preparation method according to any one of claims 1 to 9.

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