Silicon-containing flame-retardant floor mat for automobile and preparation method thereof

Abstract

The present invention discloses a silicon-containing flame-retardant automotive floor mat and a preparation method thereof, and relates to the technical field of floor mats. The present invention modifies needle-punched cloth and uses flame-retardant microcapsules to enhance the flame retardant properties of the floor mat. The present invention compounds iron oxide with silicon dioxide to enhance the dispersibility of silicon dioxide, then coats polypyrrole on its surface and further prepares it into microcapsules. The microcapsules produce phosphorus- and nitrogen-containing groups upon combustion, improving the carbonization ability, thereby enhancing the thermal stability and barrier properties of the residual carbon, thereby further inhibiting the escape of harmful gases and enhancing the flame retardant properties of the silicon-containing flame-retardant floor mat. The present invention also applies a flame-retardant coating to the surface of the floor mat to further enhance the flame retardancy of the floor mat.

Description

Technical Field

[0001] The invention relates to the technical field of foot pads, in particular to a silicon-containing flame-retardant foot pad for automobiles and a preparation method thereof. Background Art

[0002] With the rapid development of the automotive industry, floor mats, as an important component of the vehicle interior, need to not only have good wear resistance, stain resistance, and comfort, but also meet flame retardancy to ensure vehicle safety in the event of a fire. Currently, most car floor mats on the market are made of materials such as PVC and rubber. Although they have certain wear resistance and anti-slip properties, their flame retardancy is generally poor. These materials are prone to melting and burning under the influence of high temperatures or fire sources, which may cause flames to spread and pose a huge safety hazard to passengers and vehicles. In addition, traditional materials may release harmful gases during use, affecting the air quality in the vehicle. Therefore, the development of a high-performance silicon-containing flame-retardant automotive floor mat has become an urgent need in the industry.

[0003] In order to solve the above problems and improve the flame retardancy of the floor mat, the present invention provides a silicon-containing flame retardant floor mat for automobiles and a preparation method thereof. Summary of the Invention

[0004] The object of the present invention is to provide a silicon-containing flame-retardant automotive floor mat and a preparation method thereof, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for preparing a silicon-containing flame-retardant automotive floor mat comprises the following steps:

[0007] Step 1: Take ferric chloride hexahydrate and deionized water, stir evenly to obtain ferric chloride hexahydrate solution; take anhydrous ethanol and deionized water, stir evenly, add silicon dioxide-iron oxide complex, ultrasonically disperse for 30-40 minutes, add pyrrole, ultrasonically disperse for 30-40 minutes, add ferric chloride hexahydrate solution dropwise, stir for 18-20 hours, add 3-mercaptopropionic acid and benzoin dimethyl ether, stir for 4-6 hours, filter, dry, and grind to obtain flame retardant microcapsules;

[0008] Step 2: taking polyester chips, ammonium polyphosphate, flame retardant microcapsules, and a dispersant, blending, extruding, spinning, drawing, opening, carding, needling, and heat setting to obtain a flame retardant needle-punched cloth;

[0009] Step 3: Take the flame-retardant needle-punched cloth, stack the buffer layer and leather on its upper surface in sequence, and glue them together to obtain a foot pad;

[0010] Step 4: Apply the flame retardant coating to the surface of the foot pad, and then 2Expose to ultraviolet light for 8-10 minutes to obtain a flame retardant foot pad.

[0011] More optimally, the preparation method of the flame retardant coating is: take flame retardant modified waterborne polyurethane, styrene acrylic emulsion, and emulsifier, stir at 50-55°C for 60-70 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly, and obtain a flame retardant coating.

[0012] More optimally, the preparation method of the silica-iron oxide complex is as follows: take silica and Tris-HCl buffer, ultrasonically disperse for 30-40 minutes to obtain a silica dispersion; take dopamine hydrochloride and Tris-HCl buffer, stir evenly, add the silica dispersion, ultrasonicate for 15-20 minutes, stir for 6-7 hours, add nano-ferric oxide, stir for 3-4 hours, wash, dry, and grind to obtain a silica-iron oxide complex.

[0013] More optimally, the preparation method of the flame retardant modified waterborne polyurethane is as follows: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, trimethylolpropane, and acetone are taken and stirred evenly to obtain a mixed solution; polyether diol, dihydroxy silicone oil, and toluene diisocyanate are taken, nitrogen is passed through, stirred for 30-40 minutes, heated to 75-80°C, reacted for 3.5-4 hours, cooled to 70-75°C, added to the mixed solution, stirred evenly, reacted for 1-2 hours, cooled to 60-63°C, added polyethylene glycol, reacted for 3-4 hours, cooled to 20-25°C, and a mixed solution of ethylenediamine, dodecafluoroheptyl methacrylate, and acetone is added dropwise, reacted for 50-70 minutes, and distilled to obtain the flame retardant modified waterborne polyurethane.

[0014] More optimally, the flame retardant needle-punched cloth comprises the following components, by weight: 90-95 parts of polyester chips, 2-2.5 parts of ammonium polyphosphate, 2-3 parts of flame retardant microcapsules, and 2.5-3 parts of dispersant.

[0015] More optimally, the flame retardant coating comprises the following components, by weight: 95-100 parts of flame retardant modified waterborne polyurethane, 20-25 parts of styrene acrylic emulsion, 2-3 parts of crosslinking agent, 3-4 parts of emulsifier, and 0.01-0.02 parts of leveling agent.

[0016] More optimally, the dispersant is ethylene bis stearamide.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention modifies needle-punched cloth and uses flame-retardant microcapsules to enhance the flame retardancy of the foot pad. The present invention combines iron oxide with silicon dioxide to enhance the dispersibility of silicon dioxide, and then coats polypyrrole on its surface to further prepare it into microcapsules. When burned, the microcapsules produce phosphorus- and nitrogen-containing groups, improving the carbonization ability, thereby enhancing the thermal stability and barrier properties of the residual carbon, thereby further inhibiting the escape of harmful gases and enhancing the flame retardancy of the silicon-containing flame-retardant foot pad.

[0019] (2) The present invention applies a flame-retardant coating to the surface of the foot pad to enhance the flame retardancy of the foot pad. 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added to the flame-retardant coating to improve the flame retardancy of the waterborne polyurethane. Dodecafluoroheptyl methacrylate is added to improve the hydrophobicity of the waterborne polyurethane and enhance the antifouling properties of the foot pad. The present invention also adds 3-mercaptopropionic acid to the flame-retardant microcapsules. 3-mercaptopropionic acid reacts with dodecafluoroheptyl methacrylate in the flame-retardant coating under ultraviolet light, enhancing the adhesion of the coating and thus enhancing the performance of the foot pad. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] The sources of the substances involved in the present invention are not particularly limited, and illustratively include: nano-ferric oxide: average particle size: 50 nm, which can be purchased from Qinghe Chaotai Metal Materials Co., Ltd.; polyethylene glycol: model: PEG6397, which can be purchased from Changzhou Junxin Plastic Co., Ltd.; polyether diol: model: N210, number average molecular weight (Mn) = 1000, which can be purchased from Jining Baichuan Chemical Co., Ltd.; polyester chips: model: WK-801, which can be purchased from Kunshan Jinkaiwo Plastic Co., Ltd.; emulsifier: model: OP-10, which can be purchased from Shenzhen Boshun Chemical Co., Ltd.; cross-linking agent : Model: Epoxy curing agent R-2257, can be purchased from Shandong Pinshang New Materials Co., Ltd.; Leveling agent: Model: G450, can be purchased from Germany Digo; Dispersant: Ethylene bis stearic acid amide, Model: B-50, can be purchased from Indonesia EBS; Styrene acrylic emulsion: Model: Y17677, can be purchased from Shanghai Yuanye; Leather: PVC artificial leather, Model: YX-10, thickness is 0.5mm, can be purchased from Xiamen Yongdeyu Leather Co., Ltd.; Buffer layer: soft polyurethane foam plastic, Model: mz1208, thickness is 10mm, can be purchased from Suzhou Maozhen New Material Technology Co., Ltd.

[0022] Example 1: A method for preparing a silicon-containing flame-retardant automotive floor mat, comprising the following steps:

[0023] Step 1: Preparation of silica-iron oxide composite:

[0024] 1 g of silica and 100 mL of Tris-HCl buffer were ultrasonically dispersed for 35 min to obtain a silica dispersion; 1.4 g of dopamine hydrochloride and 200 mL of Tris-HCl buffer were stirred evenly, and the silica dispersion was added. Ultrasonication was performed for 18 min, and the mixture was stirred for 6.5 h. 0.4 g of nano-ferric oxide was added and stirred for 3.5 h. The mixture was washed, dried, and ground to obtain a silica-iron oxide complex.

[0025] Step 2: Preparation of flame retardant microcapsules:

[0026] Take 2g of ferric chloride hexahydrate and 50mL of deionized water, stir evenly to obtain a ferric chloride hexahydrate solution; take 8mL of anhydrous ethanol and 32mL of deionized water, stir evenly, add 6.5g of silica-iron oxide complex, ultrasonically disperse for 35min, add 0.22mL of pyrrole, ultrasonically disperse for 35min, add the ferric chloride hexahydrate solution dropwise, stir for 19h, add 1g of 3-mercaptopropionic acid and 0.2g of benzoin dimethyl ether, stir for 5h, filter, dry, and grind to obtain flame retardant microcapsules;

[0027] Step 3: Preparation of flame retardant modified waterborne polyurethane:

[0028] Take 12g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3.5g of trimethylolpropane, and 25mL of acetone, stir evenly to obtain a mixed solution; take 52g of polyether diol, 5g of dihydroxy silicone oil, and 31g of toluene diisocyanate, pass nitrogen, stir for 35min, heat to 78°C, react for 3.8h, cool to 72°C, add the mixed solution, stir evenly, react for 1.5h, cool to 62°C, add 20g of polyethylene glycol, react for 3.5h, cool to 23°C, add dropwise a mixed solution of 2.2g of ethylenediamine, 8mL of dodecafluoroheptyl methacrylate, and 20mL of acetone, react for 60min, and distill to obtain a flame retardant modified waterborne polyurethane;

[0029] Step 4: Preparation of flame retardant coating:

[0030] Take flame retardant modified waterborne polyurethane, styrene acrylic emulsion and emulsifier, stir at 52°C for 65 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly to obtain a flame retardant coating;

[0031] The flame retardant coating comprises the following components, by weight: 98 parts of flame retardant modified waterborne polyurethane, 22 parts of styrene acrylic emulsion, 2.5 parts of crosslinking agent, 3.5 parts of emulsifier, and 0.015 parts of leveling agent;

[0032] Step 5: Preparation of flame retardant needle punched fabric:

[0033] Polyester chips, ammonium polyphosphate, flame retardant microcapsules and dispersant are mixed, extruded, spun, drawn, opened, carded, needled and heat-set to obtain flame retardant needle-punched cloth;

[0034] The dispersant is ethylene bis stearamide;

[0035] The flame retardant needle-punched cloth comprises the following components, by weight: 92 parts of polyester chips, 2.2 parts of ammonium polyphosphate, 2.5 parts of flame retardant microcapsules, and 2.8 parts of dispersant;

[0036] Step 6: Preparation of silicone flame retardant mats:

[0037] Take flame retardant needle punched cloth, stack buffer layer and leather on its upper surface in sequence, glue and compound to obtain foot pad; apply flame retardant coating on the surface of foot pad, the thickness of flame retardant coating is 150μm, and then 2 The flame retardant foot pad was obtained by irradiating the foot pad under ultraviolet light for 9 minutes.

[0038] Example 2: A method for preparing a silicon-containing flame-retardant automotive floor mat, comprising the following steps:

[0039] Step 1: Preparation of silica-iron oxide composite:

[0040] 1 g of silica and 100 mL of Tris-HCl buffer were ultrasonically dispersed for 30 min to obtain a silica dispersion; 1.4 g of dopamine hydrochloride and 200 mL of Tris-HCl buffer were stirred evenly, and the silica dispersion was added. Ultrasonication was performed for 15 min, and the mixture was stirred for 6 h. 0.4 g of nano-ferric oxide was added and stirred for 3 h. The mixture was washed, dried, and ground to obtain a silica-iron oxide complex.

[0041] Step 2: Preparation of flame retardant microcapsules:

[0042] Take 2g of ferric chloride hexahydrate and 50mL of deionized water, stir evenly to obtain a ferric chloride hexahydrate solution; take 8mL of anhydrous ethanol and 32mL of deionized water, stir evenly, add 6.5g of silica-iron oxide complex, ultrasonically disperse for 30min, add 0.22mL of pyrrole, ultrasonically disperse for 30min, add the ferric chloride hexahydrate solution dropwise, stir for 18h, add 1g of 3-mercaptopropionic acid and 0.2g of benzoin dimethyl ether, stir for 4h, filter, dry, and grind to obtain flame-retardant microcapsules;

[0043] Step 3: Preparation of flame retardant modified waterborne polyurethane:

[0044] Take 12g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3.5g of trimethylolpropane, and 25mL of acetone, stir evenly to obtain a mixed solution; take 52g of polyether diol, 5g of dihydroxy silicone oil, and 31g of toluene diisocyanate, pass nitrogen, stir for 30min, heat to 75°C, react for 3.5h, cool to 70°C, add the mixed solution, stir evenly, react for 1h, cool to 60°C, add 20g of polyethylene glycol, react for 3h, cool to 20°C, add dropwise a mixed solution of 2.2g of ethylenediamine, 8mL of dodecafluoroheptyl methacrylate, and 20mL of acetone, react for 50min, and distill to obtain a flame retardant modified waterborne polyurethane;

[0045] Step 4: Preparation of flame retardant coating:

[0046] Take flame retardant modified waterborne polyurethane, styrene acrylic emulsion and emulsifier, stir at 50°C for 60 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly to obtain a flame retardant coating;

[0047] The flame retardant coating comprises the following components, by weight: 95 parts of flame retardant modified waterborne polyurethane, 20 parts of styrene acrylic emulsion, 2 parts of crosslinking agent, 3 parts of emulsifier, and 0.01 parts of leveling agent;

[0048] Step 5: Preparation of flame retardant needle punched fabric:

[0049] Polyester chips, ammonium polyphosphate, flame retardant microcapsules and dispersant are mixed, extruded, spun, drawn, opened, carded, needled and heat-set to obtain flame retardant needle-punched cloth;

[0050] The dispersant is ethylene bis stearamide;

[0051] The flame retardant needle-punched cloth comprises the following components, by weight: 90 parts of polyester chips, 2 parts of ammonium polyphosphate, 2 parts of flame retardant microcapsules, and 2.5 parts of dispersant;

[0052] Step 6: Preparation of silicone flame retardant mats:

[0053] Take flame retardant needle punched cloth, stack buffer layer and leather on its upper surface in sequence, glue and compound to obtain foot pad; apply flame retardant coating on the surface of foot pad, the thickness of flame retardant coating is 150μm, and then 2 The flame retardant foot pad was obtained by irradiating the foot pad under ultraviolet light for 8 minutes.

[0054] Example 3: A method for preparing a silicon-containing flame-retardant automotive floor mat, comprising the following steps:

[0055] Step 1: Preparation of silica-iron oxide composite:

[0056] Take 1g of silica and 100mL of Tris-HCl buffer, and ultrasonically disperse for 40 minutes to obtain a silica dispersion; take 1.4g of dopamine hydrochloride and 200mL of Tris-HCl buffer, stir evenly, add the silica dispersion, ultrasonicate for 20 minutes, stir for 7 hours, add 0.4g of nano-ferric oxide, stir for 4 hours, wash, dry, and grind to obtain a silica-iron oxide complex;

[0057] Step 2: Preparation of flame retardant microcapsules:

[0058] Take 2g of ferric chloride hexahydrate and 50mL of deionized water, stir evenly to obtain a ferric chloride hexahydrate solution; take 8mL of anhydrous ethanol and 32mL of deionized water, stir evenly, add 6.5g of silica-iron oxide complex, ultrasonically disperse for 40min, add 0.22mL of pyrrole, ultrasonically disperse for 40min, add the ferric chloride hexahydrate solution dropwise, stir for 20h, add 1g of 3-mercaptopropionic acid and 0.2g of benzoin dimethyl ether, stir for 6h, filter, dry, and grind to obtain flame-retardant microcapsules;

[0059] Step 3: Preparation of flame retardant modified waterborne polyurethane:

[0060] Take 12g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3.5g of trimethylolpropane, and 25mL of acetone, stir evenly to obtain a mixed solution; take 52g of polyether diol, 5g of dihydroxy silicone oil, and 31g of toluene diisocyanate, pass nitrogen, stir for 40min, heat to 80°C, react for 4h, cool to 75°C, add the mixed solution, stir evenly, react for 2h, cool to 63°C, add 20g of polyethylene glycol, react for 4h, cool to 25°C, add 2.2g of ethylenediamine, 8mL of dodecafluoroheptyl methacrylate, and 20mL of acetone dropwise, react for 70min, and distill to obtain a flame retardant modified waterborne polyurethane;

[0061] Step 4: Preparation of flame retardant coating:

[0062] Take flame retardant modified waterborne polyurethane, styrene acrylic emulsion and emulsifier, stir at 55°C for 70 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly to obtain a flame retardant coating;

[0063] The flame retardant coating comprises the following components, by weight: 100 parts of flame retardant modified waterborne polyurethane, 25 parts of styrene acrylic emulsion, 3 parts of crosslinking agent, 4 parts of emulsifier, and 0.02 parts of leveling agent;

[0064] Step 5: Preparation of flame retardant needle punched fabric:

[0065] Polyester chips, ammonium polyphosphate, flame retardant microcapsules and dispersant are mixed, extruded, spun, drawn, opened, carded, needled and heat-set to obtain flame retardant needle-punched cloth;

[0066] The dispersant is ethylene bis stearamide;

[0067] The flame retardant needle punched fabric comprises the following components, by weight: 95 parts of polyester chips, 2.5 parts of ammonium polyphosphate, 3 parts of flame retardant microcapsules, and 3 parts of dispersant;

[0068] Step 6: Preparation of silicone flame retardant mats:

[0069] Take flame retardant needle punched cloth, stack buffer layer and leather on its upper surface in sequence, glue and compound to obtain foot pad; apply flame retardant coating on the surface of foot pad, the thickness of flame retardant coating is 150μm, and then 2 The flame retardant foot pad was obtained by irradiating the surface of the foot pad under ultraviolet light for 10 minutes.

[0070] Comparative Example 1: No iron oxide was added, and the rest was the same as in Example 1:

[0071] Step 1: Preparation of modified silica:

[0072] 1 g of silica and 100 mL of Tris-HCl buffer were ultrasonically dispersed for 35 min to obtain a silica dispersion; 1.4 g of dopamine hydrochloride and 200 mL of Tris-HCl buffer were mixed evenly, and the silica dispersion was added, ultrasonicated for 18 min, stirred for 9 h, washed, dried, and ground to obtain modified silica;

[0073] Step 2: Preparation of flame retardant microcapsules:

[0074] Take 2g of ferric chloride hexahydrate and 50mL of deionized water, stir evenly to obtain a ferric chloride hexahydrate solution; take 8mL of anhydrous ethanol and 32mL of deionized water, stir evenly, add 6.5g of modified silica, ultrasonically disperse for 35min, add 0.22mL of pyrrole, ultrasonically disperse for 35min, add the ferric chloride hexahydrate solution dropwise, stir for 19h, add 1g of 3-mercaptopropionic acid and 0.2g of benzoin dimethyl ether, stir for 5h, filter, dry, and grind to obtain flame-retardant microcapsules;

[0075] Step 3: Preparation of flame retardant modified waterborne polyurethane:

[0076] Take 12g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3.5g of trimethylolpropane, and 25mL of acetone, stir evenly to obtain a mixed solution; take 52g of polyether diol, 5g of dihydroxy silicone oil, and 31g of toluene diisocyanate, pass nitrogen, stir for 35min, heat to 78°C, react for 3.8h, cool to 72°C, add the mixed solution, stir evenly, react for 1.5h, cool to 62°C, add 20g of polyethylene glycol, react for 3.5h, cool to 23°C, add dropwise a mixed solution of 2.2g of ethylenediamine, 8mL of dodecafluoroheptyl methacrylate, and 20mL of acetone, react for 60min, and distill to obtain a flame retardant modified waterborne polyurethane;

[0077] Step 4: Preparation of flame retardant coating:

[0078] Take flame retardant modified waterborne polyurethane, styrene acrylic emulsion and emulsifier, stir at 52°C for 65 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly to obtain a flame retardant coating;

[0079] The flame retardant coating comprises the following components, by weight: 98 parts of flame retardant modified waterborne polyurethane, 22 parts of styrene acrylic emulsion, 2.5 parts of crosslinking agent, 3.5 parts of emulsifier, and 0.015 parts of leveling agent;

[0080] Step 5: Preparation of flame retardant needle punched fabric:

[0081] Polyester chips, ammonium polyphosphate, flame retardant microcapsules and dispersant are mixed, extruded, spun, drawn, opened, carded, needled and heat-set to obtain flame retardant needle-punched cloth;

[0082] The dispersant is ethylene bis stearamide;

[0083] The flame retardant needle-punched cloth comprises the following components, by weight: 92 parts of polyester chips, 2.2 parts of ammonium polyphosphate, 2.5 parts of flame retardant microcapsules, and 2.8 parts of dispersant;

[0084] Step 6: Preparation of silicone flame retardant mats:

[0085] Take flame retardant needle punched cloth, stack buffer layer and leather on its upper surface in sequence, glue and compound to obtain foot pad; apply flame retardant coating on the surface of foot pad, the thickness of flame retardant coating is 150μm, and then 2 The flame retardant foot pad was obtained by irradiating the foot pad under ultraviolet light for 9 minutes.

[0086] Comparative Example 2: No microcapsules were prepared, and the rest was the same as in Example 1:

[0087] Step 1: Preparation of silica-iron oxide composite:

[0088] 1 g of silica and 100 mL of Tris-HCl buffer were ultrasonically dispersed for 35 min to obtain a silica dispersion; 1.4 g of dopamine hydrochloride and 200 mL of Tris-HCl buffer were stirred evenly, and the silica dispersion was added. Ultrasonication was performed for 18 min, and the mixture was stirred for 6.5 h. 0.4 g of nano-ferric oxide was added and stirred for 3.5 h. The mixture was washed, dried, and ground to obtain a silica-iron oxide complex.

[0089] Step 2: Preparation of flame retardant modified waterborne polyurethane:

[0090] Take 12g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3.5g of trimethylolpropane, and 25mL of acetone, stir evenly to obtain a mixed solution; take 52g of polyether diol, 5g of dihydroxy silicone oil, and 31g of toluene diisocyanate, pass nitrogen, stir for 35min, heat to 78°C, react for 3.8h, cool to 72°C, add the mixed solution, stir evenly, react for 1.5h, cool to 62°C, add 20g of polyethylene glycol, react for 3.5h, cool to 23°C, add dropwise a mixed solution of 2.2g of ethylenediamine, 8mL of dodecafluoroheptyl methacrylate, and 20mL of acetone, react for 60min, and distill to obtain a flame retardant modified waterborne polyurethane;

[0091] Step 4: Preparation of flame retardant coating:

[0092] Take flame retardant modified waterborne polyurethane, styrene acrylic emulsion and emulsifier, stir at 52°C for 65 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly to obtain a flame retardant coating;

[0093] The flame retardant coating comprises the following components, by weight: 98 parts of flame retardant modified waterborne polyurethane, 22 parts of styrene acrylic emulsion, 2.5 parts of crosslinking agent, 3.5 parts of emulsifier, and 0.015 parts of leveling agent;

[0094] Step 5: Preparation of flame retardant needle punched fabric:

[0095] Polyester chips, ammonium polyphosphate, silica-iron oxide composite and dispersant are mixed, extruded, spun, drawn, opened, carded, needled and heat-set to obtain flame-retardant needle-punched fabric;

[0096] The dispersant is ethylene bis stearamide;

[0097] The flame retardant needle-punched cloth comprises the following components, by weight: 92 parts of polyester chips, 2.2 parts of ammonium polyphosphate, 2.5 parts of silicon dioxide-iron oxide composite, and 2.8 parts of dispersant;

[0098] Step 6: Preparation of silicone flame retardant mats:

[0099] Take flame retardant needle punched cloth, stack buffer layer and leather on its upper surface in sequence, glue and compound to obtain foot pad; apply flame retardant coating on the surface of foot pad, the thickness of flame retardant coating is 150μm, and then 2 The flame retardant foot pad was obtained by irradiating the foot pad under ultraviolet light for 9 minutes.

[0100] Comparative Example 3: No dodecafluoroheptyl methacrylate was added, and the rest was the same as Example 1:

[0101] Step 1: Preparation of silica-iron oxide composite:

[0102] 1 g of silica and 100 mL of Tris-HCl buffer were ultrasonically dispersed for 35 min to obtain a silica dispersion; 1.4 g of dopamine hydrochloride and 200 mL of Tris-HCl buffer were stirred evenly, and the silica dispersion was added. Ultrasonication was performed for 18 min, and the mixture was stirred for 6.5 h. 0.4 g of nano-ferric oxide was added and stirred for 3.5 h. The mixture was washed, dried, and ground to obtain a silica-iron oxide complex.

[0103] Step 2: Preparation of flame retardant microcapsules:

[0104] Take 2g of ferric chloride hexahydrate and 50mL of deionized water, stir evenly to obtain a ferric chloride hexahydrate solution; take 8mL of anhydrous ethanol and 32mL of deionized water, stir evenly, add 6.5g of silica-iron oxide complex, ultrasonically disperse for 35min, add 0.22mL of pyrrole, ultrasonically disperse for 35min, add the ferric chloride hexahydrate solution dropwise, stir for 19h, add 1g of 3-mercaptopropionic acid and 0.2g of benzoin dimethyl ether, stir for 5h, filter, dry, and grind to obtain flame retardant microcapsules;

[0105] Step 3: Preparation of flame retardant modified waterborne polyurethane:

[0106] Take 12g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 3.5g of trimethylolpropane, and 25mL of acetone, stir evenly to obtain a mixed solution; take 52g of polyether diol, 5g of dihydroxy silicone oil, and 31g of toluene diisocyanate, pass nitrogen, stir for 35min, heat to 78°C, react for 3.8h, cool to 72°C, add the mixed solution, stir evenly, react for 1.5h, cool to 62°C, add 20g of polyethylene glycol, react for 3.5h, cool to 23°C, add dropwise a mixed solution of 2.2g of ethylenediamine and 20mL of acetone, react for 60min, and distill to obtain a flame retardant modified waterborne polyurethane;

[0107] Step 4: Preparation of flame retardant coating:

[0108] Take flame retardant modified waterborne polyurethane, styrene acrylic emulsion and emulsifier, stir at 52°C for 65 minutes to obtain a blended emulsion, add a crosslinking agent and a leveling agent, stir evenly to obtain a flame retardant coating;

[0109] The flame retardant coating comprises the following components, by weight: 98 parts of flame retardant modified waterborne polyurethane, 22 parts of styrene acrylic emulsion, 2.5 parts of crosslinking agent, 3.5 parts of emulsifier, and 0.015 parts of leveling agent;

[0110] Step 5: Preparation of flame retardant needle punched fabric:

[0111] Polyester chips, ammonium polyphosphate, flame retardant microcapsules and dispersant are mixed, extruded, spun, drawn, opened, carded, needled and heat-set to obtain flame retardant needle-punched cloth;

[0112] The dispersant is ethylene bis stearamide;

[0113] The flame retardant needle-punched cloth comprises the following components, by weight: 92 parts of polyester chips, 2.2 parts of ammonium polyphosphate, 2.5 parts of flame retardant microcapsules, and 2.8 parts of dispersant;

[0114] Step 6: Preparation of silicone flame retardant mats:

[0115] A flame-retardant needle-punched cloth is taken, a buffer layer and leather are sequentially stacked on the upper surface thereof, and adhesively laminated to obtain a foot pad; a flame-retardant coating is applied on the surface of the foot pad, the thickness of the flame-retardant coating being 150 μm, to obtain a flame-retardant foot pad.

[0116] experiment:

[0117] The flame-retardant mats prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to performance testing. The limiting oxygen index of the flame-retardant mats was tested. The flame-retardant mats were then placed in water and washed 10 times, each time for 30 minutes, dried, and the limiting oxygen index after washing was tested again. The flame-retardant mats were cut into 60 mm × 25 mm specimens, and their mechanical properties were tested with reference to GB / T 1040.3-2006 at a tensile speed of 100 mm / min. The obtained data are shown below:

[0118]

[0119] Conclusion: From the comparison of the data in the table, it can be seen that in Comparative Example 1, no iron oxide is added, the silicon dioxide easily agglomerates, and the flame retardant performance of the foot pad is reduced. In Comparative Example 2, no microcapsules are prepared, and the flame retardant performance of the silicon-containing flame retardant foot pad is reduced. In Comparative Example 3, no dodecafluoroheptyl methacrylate is added. After multiple water washings, the adhesion of the coating is greatly reduced, and the flame retardant performance of the foot pad is reduced. Examples 1-3 of the present invention add dodecafluoroheptyl methacrylate and also add 3-mercaptopropionic acid to the flame retardant microcapsules. 3-mercaptopropionic acid can react with dodecafluoroheptyl methacrylate in the flame retardant coating under ultraviolet light, enhancing the adhesion of the coating, thereby enhancing the performance of the foot pad.

[0120] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A method for preparing a silicon-containing flame-retardant automotive floor mat, characterized in that: The following steps are involved: Step 1: Take ferric chloride hexahydrate and deionized water, stir evenly to obtain ferric chloride hexahydrate solution; take anhydrous ethanol and deionized water, stir evenly, add silicon dioxide-iron oxide complex, ultrasonically disperse for 30-40 minutes, add pyrrole, ultrasonically disperse for 30-40 minutes, add ferric chloride hexahydrate solution dropwise, stir for 18-20 hours, add 3-mercaptopropionic acid and benzoin dimethyl ether, stir for 4-6 hours, filter, dry, and grind to obtain flame retardant microcapsules; Step 2: taking polyester chips, ammonium polyphosphate, flame retardant microcapsules, and a dispersant, blending, extruding, spinning, drawing, opening, carding, needling, and heat setting to obtain a flame retardant needle-punched cloth; Step 3: Take the flame-retardant needle-punched cloth, stack the buffer layer and leather on its upper surface in sequence, and glue them together to obtain a foot pad; Step 4: Apply the flame retardant coating to the surface of the foot pad, and then 2 Irradiate under ultraviolet light for 8-10 minutes to obtain a flame retardant foot pad; The flame retardant coating is prepared by: taking flame retardant modified waterborne polyurethane, styrene acrylic emulsion, and emulsifier, stirring at 50-55° C. for 60-70 minutes to obtain a blended emulsion, adding a crosslinking agent and a leveling agent, and stirring evenly to obtain a flame retardant coating; The preparation method of the silica-iron oxide complex comprises: taking silica and Tris-HCl buffer, ultrasonically dispersing for 30-40 minutes to obtain a silica dispersion; taking dopamine hydrochloride and Tris-HCl buffer, stirring evenly, adding the silica dispersion, ultrasonically dispersing for 15-20 minutes, stirring for 6-7 hours, adding nano-ferric oxide, stirring for 3-4 hours, washing, drying, and grinding to obtain the silica-iron oxide complex; The preparation method of the flame-retardant modified waterborne polyurethane comprises the following steps: taking 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, trimethylolpropane, and acetone, stirring uniformly to obtain a mixed solution; taking polyether diol, dihydroxy silicone oil, and toluene diisocyanate, passing nitrogen, stirring for 30-40 minutes, heating to 75-80° C., reacting for 3.5-4 hours, cooling to 70-75° C., adding the mixed solution, stirring uniformly, reacting for 1-2 hours, cooling to 60-63° C., adding polyethylene glycol, reacting for 3-4 hours, cooling to 20-25° C., adding dropwise a mixed solution of ethylenediamine, dodecafluoroheptyl methacrylate, and acetone, reacting for 50-70 minutes, and distilling to obtain the flame-retardant modified waterborne polyurethane.

2. The method for preparing a silicon-containing flame-retardant automotive floor mat according to claim 1, characterized in that: The flame retardant needle-punched cloth comprises the following components, calculated by weight: 90-95 parts of polyester chips, 2-2.5 parts of ammonium polyphosphate, 2-3 parts of flame retardant microcapsules, and 2.5-3 parts of dispersant.

3. The method for preparing a silicon-containing flame-retardant automotive floor mat according to claim 1, wherein: The flame retardant coating comprises the following components, by weight: 95-100 parts of flame retardant modified waterborne polyurethane, 20-25 parts of styrene acrylic emulsion, 2-3 parts of crosslinking agent, 3-4 parts of emulsifier, and 0.01-0.02 parts of leveling agent.

4. The method for preparing a silicon-containing flame-retardant automotive floor mat according to claim 2, wherein: The dispersant is ethylene bis stearic acid amide.

5. A silicon-containing flame-retardant floor mat prepared according to the method for preparing a silicon-containing flame-retardant floor mat for automobiles according to any one of claims 1 to 4.

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