Waterproof environment-friendly automotive interior base cloth and preparation method thereof

Abstract

The invention relates to waterproof environment-friendly automotive interior base cloth and a preparation method thereof, and relates to the technical field of automotive interior base cloth bodies. The waterproof environment-friendly automobile interior base cloth comprises an automobile interior base cloth body, the automobile interior base cloth body is coated with a waterproof layer, and the waterproof layer is formed by curing waterproof paint. The waterproof coating is prepared from the following raw materials in parts by mass: 50 to 60 parts of water-based polyvinylidene fluoride concentrated emulsion, 3 to 4 parts of antibacterial agent, 0.5 to 0.8 part of defoaming agent, 3 to 5 parts of film-forming agent, 0.4 to 0.6 part of dispersing agent, 0.4 to 0.6 part of wetting agent, 0.6 to 0.8 part of thickening agent and 25 to 35 parts of water, the emulsifying agent is prepared from poloxamer and sodium lauryl polyoxyethylene ether sulfate; the application has the effects of improving the waterproofness and antibacterial property of the automotive interior base cloth so as to prolong the service life of the automotive interior base cloth.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile interior base cloth, in particular to a waterproof environment-friendly automobile interior base cloth and a preparation method thereof. BACKGROUND

[0002] The automobile industry has become a pillar industry in China, and the development of the automobile industry has brought prosperity to the automobile interior industry and related industries in China. With the improvement of people's living needs, people have put forward new requirements for the comfort, luxury, safety and environmental protection of automobiles, thus bringing opportunities to the application of textile materials. Automobile interior fabric is cloth for automobile door panels, automobile seats, instrument panels, interior walls, roof tents and steering wheel covers.

[0003] Automobile interior base cloth is used in a car and is inevitably exposed to liquid in daily use. For example, rainwater brought in on a rainy day or beverages accidentally spilled by passengers. If the base cloth is not waterproof, these liquids will penetrate into the cloth, leaving unsightly stains, and may breed bacteria and mold, producing odors. Over time, the material itself will also be damaged, affecting the service life. SUMMARY

[0004] In order to improve the waterproofness and antibacterial property of the automobile interior base cloth and prolong the service life of the automobile interior base cloth, the application provides a waterproof environment-friendly automobile interior base cloth and a preparation method thereof.

[0005] In the first aspect, the application provides a waterproof environment-friendly automobile interior base cloth, which adopts the following technical scheme: a waterproof environment-friendly automobile interior base cloth, comprising an automobile interior base cloth body, a waterproof layer coated on the automobile interior base cloth body, the waterproof layer being formed by curing waterproof paint, the waterproof paint comprising the following raw materials in mass fraction: water-based polyvinylidene fluoride concentrated emulsion 50-60 parts, antibacterial agent 12-18 parts, defoaming agent 0.5-0.8 parts, film forming agent 1.0-1.2 parts, dispersing agent 0.4-0.6 parts, wetting agent 0.4-0.6 parts, thickening agent 0.6-0.8 parts, and water 25-35 parts. The water-based polyvinylidene fluoride concentrated emulsion comprises polyvinylidene fluoride and an emulsifier, and the emulsifier comprises poloxamer and sodium lauryl polyoxyethylene ether sulfate.

[0006] By adopting the technical scheme, the water-based polyvinylidene fluoride concentrated emulsion can form a layer of closely arranged fluorine atom "barrier" on the surface, which can significantly reduce the surface energy of the coating film, so that water molecules are difficult to spread on the surface of the coating film, showing strong hydrophobicity, thereby preventing water from infiltrating and permeating. The film-forming agent, dispersing agent and defoaming agent jointly ensure that the coating film forms a continuous, non-porous and dense structure to block the permeation channel of water. The wetting agent and thickening agent ensure that the coating film uniformly covers and tightly adheres to the surface of the base cloth, avoiding water seepage caused by interface or local defects. The antibacterial agent inhibits the growth of bacteria and mold and the possibility of producing odor. The good compatibility of the components ensures the stability of the system, and finally forms a waterproof coating film with high hydrophobicity, density and uniformity, greatly reducing the invasion of liquid, thereby significantly improving the stain resistance, easy cleaning and overall durability of the automotive interior base cloth, and prolonging the service life of the automotive interior base cloth.

[0007] In addition, the emulsifier formed by mixing poloxamer and sodium lauryl polyoxyethylene ether sulfate is added during the preparation of the water-based polyvinylidene fluoride concentrate. The emulsifier is adsorbed on the surface of the polyvinylidene fluoride particles to form a stable double electric layer or steric hindrance, so that the polyvinylidene fluoride is stably dispersed in the coating, effectively improving the stability of the waterproof layer, thereby promoting the waterproof effect of the automotive interior base cloth.

[0008] As a preferred embodiment, the preparation method of the water-based polyvinylidene fluoride concentrated emulsion comprises the following steps: After mixing poloxamer and sodium lauryl polyoxyethylene ether sulfate, the emulsifier is uniformly stirred, and then polyvinylidene fluoride and the emulsifier are mixed and homogenized to obtain a pre-emulsion. The pre-emulsion is then concentrated to obtain the water-based polyvinylidene fluoride concentrated emulsion.

[0009] By adopting the above technical scheme, poloxamer is used as a non-ionic surfactant, and sodium lauryl polyoxyethylene ether sulfate is used as an anionic surfactant. By introducing a non-ionic component, the repulsion between the hydrophilic head functional groups of the negatively charged anionic surfactant can be effectively inhibited, thereby reducing the interaction between the anionic surfactants and improving the overall stability of the complex system. Moreover, the hydrophilic group of the non-ionic surfactant has a certain polarity, and the ionic group is attracted by the ionic dipole interaction, thereby reducing the charge density on the surface of the micelle and enhancing the interaction between the molecules in the micelle and the molecules in the adsorption layer, thereby effectively improving the emulsification stability and greatly improving the stability of the waterproof layer.

[0010] As a preferred embodiment, the mass ratio of the polyvinylidene fluoride to the emulsifier is 1:(0.05-0.09), and the mass ratio of the poloxamer to the sodium lauryl polyoxyethylene ether sulfate is 6:(4.0-4.4).

[0011] By adopting the technical scheme, the mass ratio of polyvinylidene fluoride and emulsifier and the mass ratio of poloxamer and sodium lauryl polyoxyethylene ether sulfate are controlled within the above range, so that the waterproof effect of the automotive interior base cloth can be effectively improved.

[0012] Preferably, the antibacterial agent comprises nano-titanium dioxide.

[0013] By adopting the technical scheme, nano-titanium dioxide is activated by ultraviolet light irradiation, reacts with oxidizing substances (water and oxygen) adsorbed on the surface of the material to generate a large number of free radicals, thereby having good antibacterial performance, and further improving the antibacterial performance of the automotive interior base cloth.

[0014] Preferably, the antibacterial agent further comprises cinnamaldehyde, and the preparation method of the antibacterial agent comprises the following steps. S100, nano-titanium dioxide is added to anhydrous ethanol-water mixed solution, stirred uniformly, and then a mixed solution is prepared; silane coupling agent is added to the anhydrous ethanol-water mixed solution, the pH is adjusted to 4, and then water bath heating reaction is carried out under heating, then the mixed solution is added, stirred uniformly, and then heating reaction is carried out, after the reaction is completed, the reaction product is dissolved in anhydrous ethanol, and centrifugation, precipitation and drying are sequentially carried out to prepare organically modified nano-titanium dioxide; S200, the organically modified nano-titanium dioxide is added to anhydrous ethanol, stirred uniformly, and then cinnamaldehyde is added to react, after the reaction is completed, centrifugation, precipitation and drying are sequentially carried out to prepare the antibacterial agent.

[0015] By adopting the technical scheme, when nano-titanium dioxide is used as an antibacterial material, it has excellent antibacterial effect under ultraviolet light or sunlight irradiation, but the antibacterial activity of titanium dioxide is very low under dim light or dark conditions. Therefore, by hydrolyzing the silane coupling agent, then modifying the nano-titanium dioxide, and then grafting the nano-titanium dioxide surface by Schiff base reaction between cinnamaldehyde and the amino group on the surface of the organically modified nano-titanium dioxide, the nano-titanium dioxide surface is grafted with cinnamaldehyde, and the cinnamaldehyde as a natural antibacterial material has good growth inhibition or killing effect on the growth of microorganisms, which can solve the problem of poor antibacterial activity of nano-titanium dioxide in dark conditions. In addition, cinnamaldehyde has the defects of low water solubility and instability, and has the phenomena of poor antibacterial stability and short antibacterial effect, therefore, grafting cinnamaldehyde on the surface of nano-titanium dioxide improves the stability of cinnamaldehyde.

[0016] In addition, when cinnamaldehyde is grafted on the organically modified nano-titanium dioxide, the hydrophilic aldehyde group reacts with the amino group of the organically modified nano-titanium dioxide to form a Schiff base bond C=N, only the hydrophobic benzene ring structure is left, so that the nano-particle coating is relatively not easy to agglomerate, better dispersion can be achieved, and the dispersion stability of the antibacterial agent in the coating is improved.

[0017] The cinnamaldehyde grafted nano titanium dioxide can interact with the fluorocarbon chains of the aqueous polyvinylidene fluoride concentrated emulsion through Van der Waals force, thereby enhancing the interface compatibility with the waterproof coating film and improving the antibacterial effect of the waterproof coating film.

[0018] The dispersant uniformly disperses the antibacterial agent in the waterproof coating, thereby avoiding the agglomeration of the antibacterial agent to form local voids.

[0019] Preferably, the mass ratio of the nano titanium dioxide, the silane coupling agent and the cinnamaldehyde is 1:(0.15-0.19):(0.10-0.12).

[0020] By controlling the mass ratio of the nano titanium dioxide, the silane coupling agent and the cinnamaldehyde within the above range, the antibacterial property of the automotive interior base cloth is effectively improved.

[0021] Preferably, the silane coupling agent is KH-550.

[0022] Preferably, the waterproof coating further comprises 5-8 parts of silicone emulsion.

[0023] By using the above technical solution, the silicone emulsion as the aqueous fluorine-containing hydrophobic agent has the effect of reducing the surface energy of the coating film and improving the hydrophobicity. The silicone emulsion and the aqueous polyvinylidene fluoride concentrated emulsion are both fluorocarbon structures, and they have good compatibility. The silicone chain of the silicone emulsion can be compatible with the fluorocarbon chain of the aqueous polyvinylidene fluoride concentrated emulsion through Van der Waals force. Therefore, the silicone emulsion can be stably dispersed in the waterproof coating. After film formation, the silicone chain and the fluorocarbon chain are compatible through intermolecular forces, without damaging the stability of the emulsion. The low surface energy property of the silicone chain and the hydrophobicity of the aqueous polyvinylidene fluoride concentrated emulsion synergistically enhance the waterproof effect of the waterproof layer.

[0024] The hydrophobic methyl group (-CH3) of the silicone emulsion and the benzene ring (hydrophobic) of the grafted nano titanium dioxide surface cinnamaldehyde are combined through Van der Waals force and hydrophobic interaction, so that the silicone emulsion is uniformly adsorbed on the surface of the nano titanium dioxide, reducing the possibility of the decrease in the adhesion between the coating film and the automotive interior base cloth body caused by the local excess of the hydrophobic agent.

[0025] On the other hand, the application provides a preparation method of the waterproof and environmentally friendly automotive interior base cloth according to the first aspect, which uses the following technical solution: The preparation method of the waterproof and environmentally friendly automotive interior base cloth comprises the following steps: S1, first add the dispersant to water, stir until uniform, then add the aqueous polyvinylidene fluoride concentrated emulsion, stir thoroughly, then add the antibacterial agent, the defoaming agent, the film forming agent, the dispersant, the wetting agent and the thickening agent, and continue to stir to obtain the waterproof coating; S2, the automobile interior base cloth body is immersed in waterproof paint, and a waterproof layer is formed on the automobile interior base cloth body after pre-drying and high-temperature curing and cooling, so that the waterproof environment-friendly automobile interior base cloth is prepared.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The water-based polyvinylidene fluoride concentrated emulsion forms a layer of closely arranged fluorine atoms "barrier" on the surface of the molecular chain, which can significantly reduce the surface energy of the coating film, making it difficult for water molecules to spread on the surface of the coating film, showing strong hydrophobicity, thereby preventing water from infiltrating and permeating, and the film-forming agent, dispersing agent and defoaming agent together guarantee the formation of a continuous, pore-free and dense structure of the coating film, blocking the water permeation channel; the wetting agent and thickening agent ensure that the coating film is evenly covered and closely attached to the surface of the base cloth, avoiding water seepage caused by interface or local defects; the antibacterial agent inhibits the growth of bacteria and mold and the possibility of producing odor; the good compatibility of the components ensures the stability of the system, and finally forms a waterproof coating film with high hydrophobicity, density and uniformity, greatly reducing the invasion of liquid, thereby significantly improving the stain resistance, easy cleaning and overall durability of the automobile interior base cloth, prolonging the service life of the automobile interior base cloth, 2. The silane coupling agent is hydrolyzed, and then the modified nanometer titanium dioxide is organically modified, and then the Schiff base reaction between cinnamaldehyde and the amino group on the surface of the organically modified nanometer titanium dioxide is grafted, so that the nanometer titanium dioxide surface is grafted with cinnamaldehyde, and the cinnamaldehyde as a natural antibacterial material has good growth inhibition or killing effect on the growth of microorganisms, which can solve the problem of poor antibacterial activity of nanometer titanium dioxide in dark conditions. In addition, cinnamaldehyde has the defects of low water solubility and instability, and is prone to poor antibacterial stability and short antibacterial effect, therefore, grafting cinnamaldehyde on the surface of nanometer titanium dioxide improves the stability of cinnamaldehyde. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the waterproof environment-friendly automobile interior base cloth.

[0028] BRIEF DESCRIPTION OF DRAWINGS 1, automobile interior base cloth body; 2, waterproof layer. DETAILED DESCRIPTION

[0029] The following will be combined with the Figure 1 The present application is further described in detail.

[0030] The present application discloses a schematic diagram of the overall structure of the waterproof environment-friendly automobile interior base cloth. Referring to Figure 1 , the waterproof environment-friendly automobile interior base cloth comprises an automobile interior base cloth body 1, and a waterproof layer 2 is coated on the automobile interior base cloth body, and the waterproof layer 2 is formed by curing waterproof paint.

[0031] The raw materials used in the present application, except for special instructions, can be obtained by commercially available raw materials, and the present application is further described in detail below in combination with examples: Raw material description: polyvinylidene fluoride (CAS No.: 24937-79-9) is provided by Shanghai Fukang Chemical Co., Ltd., polyether defoamer is provided by Lianyungang Haichengsheng Chemical Technology Co., Ltd., dispersant (SN-5040) is provided by Dongguan Haoyoudu New Material Co., Ltd., wetting agent (OT-75) is provided by Hangzhou Moore New Material Co., Ltd., alcohol ester twelve (CAS No.: 25265-77-4) is provided by Shanghai Biyang Industry Co., Ltd., hydroxyethyl cellulose (CAS No.: 9004-62-0) is provided by Guangdong Wengjiang Chemical Reagent Co., Ltd., and polydimethylsiloxane (CAS No.: 9016-00-6) is provided by Shanghai Dingfen Chemical Technology Co., Ltd.

[0032] Example 1 The waterproof coating includes the following mass of raw materials: water-based polyvinylidene fluoride concentrated emulsion 50g, antibacterial agent 3g, defoamer 0.5g, film forming agent 3g, dispersant 0.4g, wetting agent 0.4g, thickening agent 0.6g, water 25g.

[0033] The water-based polyvinylidene fluoride concentrated emulsion includes polyvinylidene fluoride and emulsifier, and the mass ratio of polyvinylidene fluoride to emulsifier is 1:0.05; the emulsifier includes poloxamer, sodium lauryl polyoxyethylene ether sulfate, and the mass ratio of poloxamer to sodium lauryl polyoxyethylene ether sulfate is 6:4.

[0034] The preparation method of the water-based polyvinylidene fluoride concentrated emulsion includes the following steps: After the poloxamer and sodium lauryl polyoxyethylene ether sulfate are mixed and uniformly stirred, an emulsifier is prepared, then polyvinylidene fluoride and the emulsifier are mixed, and a high-speed dispersion stirrer is used to emulsify and homogenize for 10 minutes at 200r / min to obtain a pre-emulsion, then a rotary evaporator is used to concentrate for 1 hour at a vacuum degree of 0.09MPa and a temperature of 60℃ to form a concentrated pre-emulsion with a concentration of 50%, thereby preparing the water-based polyvinylidene fluoride concentrated emulsion.

[0035] The antibacterial agent is nano titanium dioxide, the defoamer is polyether defoamer, the film forming agent is alcohol ester twelve, the dispersant is SN-5040, the wetting agent is OT-75, and the thickening agent is hydroxyethyl cellulose.

[0036] The preparation method of the waterproof and environmentally friendly automotive interior base cloth includes the following steps: S1, first add dispersant to water, stir at 400 r / min for 5 min, then add water-based polyvinylidene fluoride concentrated emulsion, stir at 500 r / min for 10 min, then add antibacterial agent, defoaming agent, film forming agent, dispersant, wetting agent, thickening agent, then use ultrasonic dispersing machine to ultrasonic at 700 r / min for 15 min, then stir at 250 r / min for 30 min, prepare waterproof coating; S2, dip (the residual rate is 80%) the automobile interior base cloth body in the waterproof coating, pre-dry at 85℃ for 3 min, then cure at 170℃ for 3 min, then cool down by cooling roller, so that the waterproof layer is formed on the automobile interior base cloth body, thereby preparing the waterproof environment-friendly automobile interior base cloth.

[0037] Example 2 The waterproof coating comprises the following mass of raw materials: water-based polyvinylidene fluoride concentrated emulsion 60g, antibacterial agent 4g, defoaming agent 0.8g, film forming agent 5g, dispersant 0.6g, wetting agent 0.6g, thickening agent 0.8g, water 35g.

[0038] The water-based polyvinylidene fluoride concentrated emulsion comprises polyvinylidene fluoride and emulsifier, and the mass ratio of polyvinylidene fluoride to emulsifier is 1:0.09; the emulsifier comprises poloxamer and sodium lauryl ether sulfate, and the mass ratio of poloxamer to sodium lauryl ether sulfate is 6:4.4.

[0039] The preparation method of the water-based polyvinylidene fluoride concentrated emulsion comprises the following steps: After mixing poloxamer and sodium lauryl ether sulfate, stirring uniformly, the emulsifier is prepared, then polyvinylidene fluoride and the emulsifier are mixed, and a high-speed dispersion stirrer is used to emulsify and homogenize at 200 r / min for 10 min to obtain a pre-emulsion, then a rotary evaporator is used to concentrate at a vacuum degree of 0.09 MPa and a temperature of 60℃ for 1h to form a concentrated pre-emulsion, so that the concentration reaches 50%, and the water-based polyvinylidene fluoride concentrated emulsion is prepared.

[0040] The antibacterial agent is nano titanium dioxide, the defoaming agent is polyether defoaming agent, the film forming agent is alcohol ester twelve, the dispersant is SN-5040, the wetting agent is OT-75, and the thickening agent is hydroxyethyl cellulose.

[0041] The preparation method of the waterproof environment-friendly automobile interior base cloth comprises the following steps: S1, first add dispersant to water, stir at 400 r / min for 5 min, then add water-based polyvinylidene fluoride concentrated emulsion, stir at 500 r / min for 10 min, then add antibacterial agent, defoaming agent, film forming agent, dispersant, wetting agent, thickening agent, then use ultrasonic dispersion machine to ultrasonic for 15 min at 700 r / min, then stir at 250 r / min for 30 min, to prepare waterproof coating; S2, dip (80% of the residual rate) the automobile interior base cloth body in the waterproof coating, pre-dry at 85℃ for 3 min, then cure at 170℃ for 3 min, and then cool down by cooling roller, to form a waterproof layer on the automobile interior base cloth body, thereby preparing a waterproof environment-friendly automobile interior base cloth.

[0042] Example 3 The waterproof coating comprises the following raw materials by mass: water-based polyvinylidene fluoride concentrated emulsion 55g, antibacterial agent 3.5g, defoaming agent 0.7g, film forming agent 4g, dispersant 0.5g, wetting agent 0.5g, thickening agent 0.7g, water 30g.

[0043] The water-based polyvinylidene fluoride concentrated emulsion comprises polyvinylidene fluoride and emulsifier, and the mass ratio of polyvinylidene fluoride to emulsifier is 1:0.07; the emulsifier comprises poloxamer and sodium lauryl ether sulfate, and the mass ratio of poloxamer to sodium lauryl ether sulfate is 6:4.2.

[0044] The preparation method of the water-based polyvinylidene fluoride concentrated emulsion comprises the following steps: After mixing poloxamer and sodium lauryl ether sulfate, stir uniformly to prepare the emulsifier, then mix polyvinylidene fluoride and the emulsifier, use a high-speed dispersion stirrer to emulsify and homogenize at 200 r / min for 10 min to obtain a pre-emulsion, then use a rotary evaporator to concentrate at a vacuum degree of 0.09 MPa and a temperature of 60℃ for 1h to form a concentrated pre-emulsion with a concentration of 50%, thereby preparing the water-based polyvinylidene fluoride concentrated emulsion.

[0045] The antibacterial agent is nano titanium dioxide, the defoaming agent is polyether defoaming agent, the film forming agent is alcohol ester twelve, the dispersant is SN-5040, the wetting agent is OT-75, and the thickening agent is hydroxyethyl cellulose.

[0046] The preparation method of the waterproof environment-friendly automobile interior base cloth comprises the following steps: S1, first add dispersant to water, stir at 400 r / min for 5 min, then add aqueous polyvinylidene fluoride concentrated emulsion, stir at 500 r / min for 10 min, then add antibacterial agent, defoaming agent, film forming agent, dispersant, wetting agent, thickening agent, then use ultrasonic dispersion machine to ultrasonic for 15 min at 700 r / min, then stir at 250 r / min for 30 min, to prepare waterproof coating; S2, dip (80% of the residual rate) the automobile interior base cloth body in the waterproof coating, pre-dry at 85℃ for 3 min, then cure at 170℃ for 3 min, and then cool down by cooling roller, to form a waterproof layer on the automobile interior base cloth body, thereby preparing the waterproof environment-friendly automobile interior base cloth.

[0047] Example 4 The difference between Example 4 and Example 3 is that the mass ratio of polyvinylidene fluoride and emulsifier is 1:0.02, and the emulsifier includes poloxamer, sodium lauryl ether sulfate, and the mass ratio of poloxamer and sodium lauryl ether sulfate is 6:3.5.

[0048] Example 5 The difference between Example 5 and Example 3 is that the mass ratio of polyvinylidene fluoride and emulsifier is 1:0.12, and the emulsifier includes poloxamer, sodium lauryl ether sulfate, and the mass ratio of poloxamer and sodium lauryl ether sulfate is 6:4.9.

[0049] Example 6 The difference between Example 6 and Example 3 is that the antibacterial agent includes nano titanium dioxide and cinnamaldehyde.

[0050] The preparation method of the antibacterial agent includes the following steps: S100, add 10 g of nano titanium dioxide to 50 mL of anhydrous ethanol-water mixed solution (Vwater:Vanhydrous ethanol=3:7), and prepare a mixed solution by ultrasonic and vibration for 1 h; under stirring at 35℃, dissolve 1.5 g of silane coupling agent in 220 mL of anhydrous ethanol-water mixed solution (Vwater:Vanhydrous ethanol=1:4.5), adjust the pH of the solution to 4 with hydrochloric acid, and then heat to 60℃ in a water bath for 1 h; then add the mixed solution, stir and mix, and continue to heat at 60℃ for 2 h after reaction; after the reaction is completed, dissolve the reaction product in anhydrous ethanol, centrifuge with a high-speed centrifuge to remove excess anhydrous ethanol, and collect the precipitate. Disperse the precipitate in anhydrous ethanol again, repeat the above washing operation 5 times, and finally dry the precipitate in a vacuum oven at 40℃ for 15 h; S200, the organic nanometer titanium dioxide is dissolved in anhydrous ethanol, 1.2 g of cinnamaldehyde is added after ultrasonic dispersion for 30 min, reaction is carried out at 60 DEG C under nitrogen for 36 h, after reaction is completed, the reaction product is dissolved in anhydrous ethanol, centrifugation is carried out by using a high-speed centrifuge to remove excessive anhydrous ethanol, and the precipitate is collected, the precipitate part is dispersed in anhydrous ethanol again, the above washing operation is repeated for 3 times, finally, the precipitate is dried by using a vacuum oven at 40 DEG C for 8 h, and the antibacterial agent is prepared.

[0051] The silane coupling agent is KH-550.

[0052] Example 7 The difference between example 7 and example 3 is that the antibacterial agent comprises nanometer titanium dioxide and cinnamaldehyde.

[0053] The preparation method of the antibacterial agent comprises the following steps: S100, 10 g of nanometer titanium dioxide is added into 50 mL of anhydrous ethanol-water mixed solution (V water:V anhydrous ethanol=3:7), and a mixed solution is prepared by ultrasonic vibration for 1 h; 1.9 g of a silane coupling agent is dissolved in 220 mL of anhydrous ethanol-water mixed solution (V water:V anhydrous ethanol=1:4.5) under stirring at 35 DEG C, the pH of the solution is adjusted to 4 by using hydrochloric acid, and then the solution is heated to 60 DEG C in a water bath for reaction for 1 h; then the mixed solution is added, and after stirring and mixing, the reaction is continuously heated at 60 DEG C for 2 h; after the reaction is completed, the reaction product is dissolved in anhydrous ethanol, centrifugation is carried out by using a high-speed centrifuge to remove excessive anhydrous ethanol, and the precipitate is collected, the precipitate part is dispersed in anhydrous ethanol again, the above washing operation is repeated for 5 times, and finally, the precipitate is dried by using a vacuum oven at 40 DEG C for 15 h; S200, the organic nanometer titanium dioxide is dissolved in anhydrous ethanol, 1.2 g of cinnamaldehyde is added after ultrasonic dispersion for 30 min, reaction is carried out at 60 DEG C under nitrogen for 36 h, after reaction is completed, the reaction product is dissolved in anhydrous ethanol, centrifugation is carried out by using a high-speed centrifuge to remove excessive anhydrous ethanol, and the precipitate is collected, the precipitate part is dispersed in anhydrous ethanol again, the above washing operation is repeated for 3 times, finally, the precipitate is dried by using a vacuum oven at 40 DEG C for 8 h, and the antibacterial agent is prepared.

[0054] The silane coupling agent is KH-550.

[0055] Example 8 The difference between example 8 and example 3 is that the antibacterial agent comprises nanometer titanium dioxide and cinnamaldehyde.

[0056] The preparation method of the antibacterial agent comprises the following steps: S100, 10 g of nano-titanium dioxide is added to 50 mL of anhydrous ethanol-water mixed solution (Vwater:Vanhydrous ethanol=3:7), and a mixed solution is prepared by ultrasonic and vibration for 1 h; 1.7 g of silane coupling agent is dissolved in 220 mL of anhydrous ethanol-water mixed solution (Vwater:Vanhydrous ethanol=1:4.5) under stirring at 35℃, and the pH of the solution is adjusted to 4 with hydrochloric acid, and then the solution is heated to 60℃ in a water bath for 1 h; then the mixed solution is added, and the mixture is stirred and heated at 60℃ for 2 h; after the reaction is completed, the reaction product is dissolved in anhydrous ethanol, centrifuged by a high-speed centrifuge to remove excess anhydrous ethanol, and the precipitate is collected and dispersed in anhydrous ethanol again, and the above washing operation is repeated 5 times, and finally the precipitate is dried in a vacuum oven at 40℃ for 15 h; S200, the organic nano-titanium dioxide is dissolved in anhydrous ethanol, ultrasonic dispersion is performed for 30 min, then 1.1 g of cinnamaldehyde is added, and the reaction is carried out at 60℃ under nitrogen for 36 h; after the reaction is completed, the reaction product is dissolved in anhydrous ethanol, centrifuged by a high-speed centrifuge to remove excess anhydrous ethanol, and the precipitate is collected and dispersed in anhydrous ethanol again, and the above washing operation is repeated 3 times, and finally the precipitate is dried in a vacuum oven at 40℃ for 8 h to prepare an antibacterial agent.

[0057] The silane coupling agent is KH-550.

[0058] Example 9 The difference between Example 9 and Example 8 is that the mass ratio of nano-titanium dioxide, silane coupling agent and cinnamaldehyde is 1:0.11:0.11.

[0059] Example 10 The difference between Example 10 and Example 8 is that the mass ratio of nano-titanium dioxide, silane coupling agent and cinnamaldehyde is 1:0.23:0.11.

[0060] Example 11 The difference between Example 11 and Example 8 is that the mass ratio of nano-titanium dioxide, silane coupling agent and cinnamaldehyde is 1:0.17:0.08.

[0061] Example 12 The difference between Example 12 and Example 8 is that the mass ratio of nano-titanium dioxide, silane coupling agent and cinnamaldehyde is 1:0.17:0.14.

[0062] Example 13 The difference between Example 13 and Example 8 is that the waterproof coating further comprises 5 g of silicone emulsion, and the silicone emulsion is polydimethylsiloxane.

[0063] The preparation method of the waterproof and environmentally friendly automobile interior base cloth comprises the following steps: S1, first add dispersant to water, stir at 400 r / min for 5 min, then add water-based polyvinylidene fluoride concentrated emulsion, stir at 500 r / min for 10 min, then add antibacterial agent, defoaming agent, film forming agent, dispersant, wetting agent, thickening agent, silicone emulsion, then use ultrasonic dispersing machine to ultrasonic at 700 r / min for 15 min, then stir at 250 r / min for 30 min, to prepare waterproof coating; S2, dip (80% of the residual rate) the automobile interior base cloth body in the waterproof coating, pre-dry at 85℃ for 3 min, then cure at 170℃ for 3 min, and then cool down by cooling roller, to form a waterproof layer on the automobile interior base cloth body, thereby preparing the waterproof environment-friendly automobile interior base cloth.

[0064] Example 14 The difference between Example 14 and Example 13 is that the waterproof coating further comprises 8 g of silicone emulsion, and the silicone emulsion is polydimethylsiloxane.

[0065] Example 15 The difference between Example 15 and Example 13 is that the waterproof coating further comprises 6 g of silicone emulsion, and the silicone emulsion is polydimethylsiloxane.

[0066] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that the waterproof coating comprises the following raw materials: polyvinylidene fluoride 55 g, antibacterial agent 3.5 g, defoaming agent 0.7 g, film forming agent 4 g, dispersant 0.5 g, wetting agent 0.5 g, thickening agent 0.7 g, and water 30 g.

[0067] The antibacterial agent is nano titanium dioxide, the defoaming agent is polyether defoaming agent, the film forming agent is alcohol ester twelve, the dispersant is SN-5040, the wetting agent is OT-75, and the thickening agent is hydroxyethyl cellulose.

[0068] The preparation method of the waterproof environment-friendly automobile interior base cloth comprises the following steps: S1, first add dispersant to water, stir at 400 r / min for 5 min, then add water-based polyvinylidene fluoride concentrated emulsion, stir at 500 r / min for 10 min, then add antibacterial agent, defoaming agent, film forming agent, dispersant, wetting agent, thickening agent, silicone emulsion, then use ultrasonic dispersing machine to ultrasonic at 700 r / min for 15 min, then stir at 250 r / min for 30 min, to prepare waterproof coating; S2, dip the automobile interior base cloth body in waterproof paint with 80% of the residual rate, pre-dry at 85℃ for 3 minutes, then cure at 170℃ for 3 minutes, and then cool down through a cooling roller, so as to form a waterproof layer on the automobile interior base cloth body, thereby obtaining the waterproof environment-friendly automobile interior base cloth.

[0069] Comparative Example 2 The difference between Comparative Example 2 and Example 8 is that the antibacterial agent is only cinnamaldehyde.

[0070] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that no antibacterial agent is added in the waterproof paint.

[0071] Performance detection: cut the waterproof environment-friendly automobile interior base cloth prepared in Examples 1-15 and Comparative Examples 1-3 into 10cm*10cm for the following performance tests.

[0072] Waterproof performance: use JGW-360 full-automatic optical contact angle measuring instrument to test the water contact angle of the sample surface, test the waterproof performance, and record the test results in Table 1.

[0073] Antibacterial performance: refer to GB / T20944.3 2008 "Evaluation of Antibacterial Performance of Textiles Part 3: Oscillation Method", and select Staphylococcus aureus and Escherichia coli as representative bacteria for antibacterial test, and record the test results in Table 1.

[0074] Table 1 Performance detection It can be seen from Examples 6-8 and Example 3 that the antibacterial performance of Examples 6-8 is better than that of Example 3, and the difference between Examples 6-8 and Example 3 is that the antibacterial agent includes nano-silicon dioxide and cinnamaldehyde. By grafting cinnamaldehyde on the organic modified nano-titanium dioxide, the problem of poor antibacterial activity of nano-titanium dioxide in dark conditions can be solved, thereby effectively improving the antibacterial performance of the automobile interior base cloth.

[0075] It can be seen from Examples 13-15 and Examples 6-8 that the waterproof performance of Examples 13-15 is better than that of Examples 6-8, and the difference between Examples 13-15 and Examples 6-8 is that the waterproof paint contains silicone emulsion. The low surface energy characteristics of the silicon-oxygen chain on the silicone emulsion and the hydrophobicity of the water-based polyvinylidene fluoride concentrated milk synergistically enhance the waterproof effect of the waterproof layer, and the silicone emulsion has good dispersibility in the waterproof paint, thereby improving the waterproof performance of the automobile interior base cloth.

[0076] Specifically, it can be seen from the combination of example 3 and comparative example 1 that the waterproof property of example 3 is better than that of comparative example 1, and the difference between example 3 and comparative example 1 is that the polyvinylidene fluoride is treated by an emulsifier to form an aqueous polyvinylidene fluoride concentrated emulsion, which is adsorbed on the surface of the polyvinylidene fluoride particles by the emulsifier, forming a stable double electric layer or steric hindrance, so that the polyvinylidene fluoride is stably dispersed in the coating, effectively improving the stability of the waterproof layer, thereby improving the waterproof property of the automotive interior base cloth.

[0077] Specifically, it can be seen from the combination of example 8 and comparative example 2 that the antibacterial property of example 8 is better than that of comparative example 2, and the difference between example 8 and comparative example 2 is that the antibacterial agent comprises nano-silicon dioxide and cinnamaldehyde, and by grafting cinnamaldehyde on the organic modified nano-titanium dioxide, the possibility of low water solubility and instability of cinnamaldehyde is reduced, and the stability of cinnamaldehyde in the waterproof coating is improved, thereby improving the antibacterial property of the automotive interior base cloth.

[0078] Specifically, it can be seen from the combination of example 3 and comparative example 3 that the antibacterial property of example 3 is better than that of comparative example 3, and the difference between example 3 and comparative example 3 is that the waterproof coating contains an antibacterial agent, and the antibacterial agent is nano-silicon dioxide, and the nano-titanium dioxide is activated by ultraviolet light, and reacts with the oxidizing substances adsorbed on the surface of the material to generate a large number of free radicals, thereby having good antibacterial performance, and further improving the antibacterial performance of the automotive interior base cloth.

[0079] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made in the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A waterproof and environmentally-friendly automobile interior base cloth, comprising an automobile interior base cloth body (1), a waterproof layer (2) coated on the automobile interior base cloth body (1), the waterproof layer (2) being formed by curing a waterproof coating, the waterproof coating comprising the following raw materials in mass fraction: water-based polyvinylidene fluoride concentrated emulsion 50-60 parts, antibacterial agent 3-4 parts, defoaming agent 0.5-0.8 parts, film forming agent 3-5 parts, dispersing agent 0.4-0.6 parts, wetting agent 0.4-0.6 parts, thickening agent 0.6-0.8 parts, and water 25-35 parts. The water-based polyvinylidene fluoride concentrated emulsion comprises polyvinylidene fluoride and an emulsifier, and the emulsifier comprises poloxamer and sodium lauryl ether sulfate.

2. The waterproof and environmentally friendly automotive interior base cloth according to claim 1, characterized in that: A preparation method of the water-based polyvinylidene fluoride concentrated emulsion, comprising the following steps: The poloxamer and sodium lauryl ether sulfate are mixed and stirred uniformly to prepare an emulsifier, then the polyvinylidene fluoride and the emulsifier are mixed and emulsified uniformly to obtain a pre-emulsion, and then concentration treatment is performed to prepare the water-based polyvinylidene fluoride concentrated emulsion.

3. The waterproof and environmentally friendly automotive interior base cloth according to claim 2, characterized in that: The mass ratio of the polyvinylidene fluoride to the emulsifier is 1: (0.05-0.09), and the mass ratio of the poloxamer to the sodium lauryl ether sulfate is 6: (4.0-4.4).

4. The waterproof and environmentally friendly automotive interior base cloth according to claim 1, characterized in that: The antibacterial agent comprises nano-titanium dioxide.

5. The waterproof and environmentally friendly automotive interior base cloth according to claim 4, characterized in that: The antibacterial agent further comprises cinnamyl aldehyde, and a preparation method of the antibacterial agent, comprising the following steps: S100, adding nano-titanium dioxide into anhydrous ethanol-water mixed solution, stirring uniformly, then adding silane coupling agent into the anhydrous ethanol-water mixed solution, adjusting pH to 4, then performing water bath heating reaction, then adding the mixed solution, stirring uniformly, then performing heating reaction, after the reaction is completed, dissolving the reaction product in anhydrous ethanol, and then performing centrifugation, precipitation and drying in sequence to prepare organically modified nano-titanium dioxide; S200, adding the organically modified nano-titanium dioxide into anhydrous ethanol, stirring uniformly, then adding cinnamyl aldehyde to react, and then performing centrifugation, precipitation and drying in sequence to prepare the antibacterial agent.

6. The waterproof and environmentally friendly automotive interior base cloth according to claim 5, characterized in that: The mass ratio of the nano-titanium dioxide, the silane coupling agent and the cinnamyl aldehyde is 1: (0.15-0.19): (0.10-0.12).

7. The waterproof and environmentally friendly automotive interior base cloth according to claim 5, characterized in that: The silane coupling agent is KH-550.

8. The waterproof and environmentally friendly automotive interior base cloth according to claim 1, characterized in that: The waterproof coating further comprises 5-8 parts of silicone emulsion.

9. A preparation method of the waterproof and environmentally-friendly automobile interior base cloth according to claim 1, characterized in that: S1, adding dispersing agent into water, stirring uniformly, then adding water-based polyvinylidene fluoride concentrated emulsion, stirring fully, then adding antibacterial agent, defoaming agent, film forming agent, dispersing agent, wetting agent and thickening agent, and continuing to stir to prepare the waterproof coating; S2, dipping and rolling the automobile interior base cloth body in the waterproof coating, pre-drying, then performing high-temperature curing, then cooling, then forming the waterproof layer on the automobile interior base cloth body to prepare the waterproof and environmentally-friendly automobile interior base cloth.

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