CN110566898A - Car light lampshade with self-cleaning function - Google Patents
Car light lampshade with self-cleaning function Download PDFInfo
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- CN110566898A CN110566898A CN201910692078.7A CN201910692078A CN110566898A CN 110566898 A CN110566898 A CN 110566898A CN 201910692078 A CN201910692078 A CN 201910692078A CN 110566898 A CN110566898 A CN 110566898A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/53—Base coat plus clear coat type
- B05D7/534—Base coat plus clear coat type the first layer being let to dry at least partially before applying the second layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
- F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
- F21S41/435—Hoods or cap-shaped
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2451/00—Type of carrier, type of coating (Multilayers)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2518/00—Other type of polymers
- B05D2518/10—Silicon-containing polymers
- B05D2518/12—Ceramic precursors (polysiloxanes, polysilazanes)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
- B05D2601/24—Titanium dioxide, e.g. rutile
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention discloses a lamp shade of a car lamp with a self-cleaning function, which belongs to the technical field of automobile accessories and comprises a lens, a reflector and a shell, wherein a transparent self-cleaning coating is coated on the inner surface of the lens, the self-cleaning coating comprises a micro-erosion layer and a self-cleaning layer, the micro-erosion layer is provided with an uneven micro-structure outer surface, the roughness Ra of the micro-erosion layer is 10-20 mu m, and the self-cleaning layer is mainly prepared from aluminosiloxane resin obtained by the reaction of methyl triethoxysilane, aluminum isopropoxide and carbodiimide. This car light lamp shade is used for solving present car light and uses the back for a long time, and the inside internal surface of lamp shade adsorbs organic volatile matter, hazes and inside is infected with dirty problem.
Description
Technical Field
The invention relates to the technical field of automobile accessories, in particular to a lampshade of a car lamp with a self-cleaning function.
background
in recent years, with the rapid development of urbanization, the number of automobiles kept by people in China is increased year by year, but parking spaces are not matched with the increment of the automobiles, so that most of automobiles stop outdoors or on roads, and because the automobile lamps of the automobiles are externally arranged, the automobiles are exposed outdoors for a long time and are exposed to the sun, the rain, air pollution and other influences, dust and water vapor easily enter the lamp shade from gaps to form dirt, the intensity of the automobile lamps is reduced after long-term use, the light is dim, and the driving safety is influenced.
the automobile lamp internal part material is the plastics material basically, because the car light is opened the back, and the inside ambient temperature of lamp is very high, and after the front light was opened 15 minutes, LED headlight luminous point position temperature was about 84.4 ℃, and xenon lamp luminous point position temperature was about 90 ℃, the plastic part can constantly volatilize the micromolecule organic matter under high temperature, and the lens temperature is relatively low simultaneously, and the organic matter is very easily at the condensation of lens internal surface. Therefore, after the car lamp is used for a period of time, organic matters are adsorbed on the inner surface of the lens, so that the lens of the car lamp is hazy, and the light transmittance is reduced. Moreover, as the car lamp is exposed to the sun for a long time, the molecular chains of plastic parts in the car lamp can be degraded due to the penetration of ultraviolet rays, so that the volatility of the plastic is higher, such as the generation of VOC (volatile organic compounds) and the like. The adsorption of small molecules can cause the loss of the activity of hydrophilic groups on the surface of an antifogging coating on the inner side of a lens of the automobile lamp, and the problems of fogging and transmittance reduction of the automobile lamp become more serious in the past. At present, aiming at the problem that the lens of the car lamp absorbs organic matters to yellow, the absorption of the organic matters on the lens is generally reduced by controlling the heating temperature of the car lamp, increasing the heat-resistant temperature of materials, using specially treated low-volatility materials and the like. However, these treatments lead to an increase in the cost of the lamp material and the cost of the heat dissipating member, and also do not fundamentally solve the problems of organic adsorption and fogging. Therefore, there is an urgent need for a lamp cover for a vehicle lamp, which can solve the problems of the prior vehicle lamp that organic volatile matters are adsorbed on the inner surface of a lens, fogging occurs and plastic parts are degraded by ultraviolet rays in the using process.
Disclosure of Invention
The invention aims to provide a lampshade of a vehicle lamp with a self-cleaning function, aiming at solving the problems that the inner surface of the lampshade adsorbs organic volatile matters, the inner surface of the lampshade generates fog and the inner part is polluted after the existing vehicle lamp is used for a long time.
The invention solves the technical problems by the following technical means:
The utility model provides a car light lamp shade with self-cleaning function, the lens internal surface covers has transparent self-cleaning coating, the self-cleaning coating is including eroding layer and self-cleaning layer a little, the erosion layer has unevenness's micro-structure surface a little, and the roughness Ra that erodes the layer a little is 10-20 mu m, self-cleaning layer mainly is made by the aluminium-containing siloxane resin that methyl triethoxysilane, aluminium isopropoxide and carbodiimide reaction obtained.
Further, the thickness of the self-cleaning coating is not more than 0.3 cm.
The self-cleaning coating on the inner surface of the lens is a transparent coating, so that the light emitted by the vehicle lamp cannot be blocked to cause the loss of the visual field, and the driving safety is ensured. The self-cleaning layer prepared by hydrolysis and polycondensation of methyl triethoxysilane and aluminum isopropoxide has the characteristics of high transparency, good heat resistance and prevention of adhesion of volatile organic compounds, can keep the inner surface of a lens of a lampshade clean, prevents a car lamp from fogging, and solves the problem of internal contamination and pollution.
Furthermore, the material of the lens is polycarbonate.
Further, the micro erosion layer comprises the following raw materials in parts by weight: 50-200 parts of N, N-dimethylformamide, 2-10 parts of propylene glycol methyl ether and 30-70 parts of titanium dioxide, wherein the self-cleaning layer comprises the following raw materials in parts by weight: 150-180 parts of methyltriethoxysilane, 90-108 parts of aluminum isopropoxide and 2.7-5.4 parts of carbodiimide.
Further, the preparation steps of the self-cleaning coating on the inner surface of the lens are as follows:
(1) Pretreatment: preheating the clean lens to 30-35 ℃ in an oven for later use;
(2) preparing a micro erosion layer: adding N, N-dimethylformamide into an ethanol solution, uniformly stirring to prepare an N, N-dimethylformamide-ethanol mixed solution, then adding propylene glycol methyl ether and titanium dioxide, stirring for 10-15min to obtain a binding agent, uniformly coating the binding agent on the inner surface of a pretreated lens, then placing the lens in a constant temperature box at 40-45 ℃ for 10-15min at constant temperature, taking out the lens, spraying 0.5-1 wt% hydrochloric acid solution on the inner surface of the lens, standing for 2-3min, uniformly coating the binding agent on the inner surface of the lens again, then placing the lens in a constant temperature box at 55-60 ℃ for 8-10min at constant temperature, taking out the lens, ventilating and drying at normal temperature to obtain a micro-erosion layer;
(3) preparation of an aluminum-containing siloxane resin: mixing methyltriethoxysilane and deionized water, heating to 40-42 ℃ in a water bath, adding aluminum isopropoxide, carbodiimide and nitric acid, uniformly stirring, placing in a closed container, stirring and reacting at 70-90 ℃ for 1-2h, taking out, adding ammonia water, heating to 60-70 ℃, stirring and reacting under the protection of nitrogen for 6.5-7h, and cooling to obtain aluminum-containing siloxane resin;
(4) preparing a self-cleaning layer: and spraying the aluminous siloxane resin on the surface of the micro-erosion layer of the lens, and curing to obtain the self-cleaning layer on the inner surface of the lens.
the lens is cleaned, so that the phenomenon that the self-cleaning layer falls off due to untight combination with the micro-erosion layer caused by oil stains or impurities on the surface of the lens can be prevented. The smaller the particle size of the titanium dioxide is, the more uniform the titanium dioxide is dispersed in the N, N-dimethylformamide-ethanol mixed solution, but in order to further increase the dispersibility and the surface activity of the titanium dioxide, the titanium dioxide needs to be firstly activated on the surface of the titanium dioxide in a low-temperature plasma device, and then the activated titanium dioxide is mixed with propylene glycol methyl ether, so that the surface tension between the titanium dioxide and the N, N-dimethylformamide-ethanol mixed solution is weakened, and the titanium dioxide is dispersed more uniformly. Because the material of the lens is polycarbonate, the mixed solution of N, N dimethylformamide and ethanol can slightly erode the inner surface of the lens, and slightly swell the inner surface of the lens at a certain temperature. Spraying a low-concentration hydrochloric acid solution, spraying an N, N-dimethylformamide-ethanol mixed solution, keeping the temperature at a constant temperature to promote the slightly swollen surface to deform slightly at a certain temperature, and adhering or wrapping titanium dioxide on the inner surface of the lens for photocatalysis after cooling. After the micro erosion layer is prepared, the organic matter residue can be cleaned by using clear water.
the methyl triethoxysilane is hydrolyzed under the action of a nitric acid catalyst to obtain silanol, the silicon hydroxyl on the silanol is protonated to reduce the electron density on a silicon atom, the silicon atom is easy to be attacked by nucleophilicity, carbodiimide is added for reducing the reaction rate, the hydrolysis rate of the methyl triethoxysilane is inhibited, and the silanol is prevented from being unstable due to too fast hydrolysis, so that the condensation reaction fails. Aluminum isopropoxide is decomposed into aluminum hydroxide and isopropanol when meeting water, aluminum ions are provided, methyltriethoxysilane contains Si-O-Si bonds, but can not exist stably for a long time under an acidic condition, so that the aluminum hydroxide is broken into Si-OH bonds to generate a condensation reaction with the aluminum ions to generate Si-O-Al, a cross-linked siloxane resin is formed, and the siloxane resin with low cross-linking degree continues to be cross-linked under the action of ammonia water to form the transparent aluminum-containing siloxane resin with high cross-linking degree. The obtained siloxane resin is coated on the surface of the micro-erosion layer with micro deformation until the lens forms a smooth inner surface, and a transparent and flat self-cleaning coating is obtained after curing. The aluminum-containing siloxane resin formed by hydrolyzing and polycondensing the methyl triethoxysilane and aluminum ions has high hardness, enhanced heat resistance, reduced adhesive force and low contamination possibility.
further, the concentration of N, N dimethylformamide in the N, N dimethylformamide-ethanol mixed solution is 9 to 11 wt%. Too high concentration easily causes the excessive corrosion of the inner surface of the lens and damages the structure of the lampshade.
Further, the titanium dioxide in the step (2) is pretreated, wherein the pretreatment is to clean the titanium dioxide with the particle size of 20-25nm by using an ethanol solution, dry the titanium dioxide in the air and place the titanium dioxide in a low-temperature plasma device with the power of 100W and the pressure of 1Pa for treatment for 1-2min by using oxygen as a working gas.
further, in the step (3), the mass ratio of the methyltriethoxysilane to the aluminum isopropoxide is 1:0.6, and the mass ratio of the methyltriethoxysilane to the deionized water is 1 (2-2.5).
further, in the step (3), the mass ratio of aluminum isopropoxide to carbodiimide is 1 (0.03-0.05).
The lamp shade with the self-cleaning function for the vehicle lamp has the following beneficial effects:
1. the self-cleaning coating coated inside the lampshade is not easy to adsorb volatile organic compounds and is contaminated, the cleaning times are reduced, and the service life of the lampshade is prolonged.
2. The self-cleaning coating has certain hardness, and can prevent scattered sundries in the lampshade from scratching the coating and weakening the self-cleaning function of the coating.
3. The micro erosion layer contains nano titanium dioxide, can perform photocatalysis and can also play a role in purifying volatile organic compounds.
4. The micro-erosion layer not only wraps titanium dioxide after micro-erosion, but also increases the roughness of the micro-erosion layer, so that the self-cleaning layer is better attached to the micro-erosion layer and is not easy to fall off.
5. The self-cleaning layer is mainly made of aluminum-containing siloxane resin, the aluminum-containing siloxane resin has high hardness, enhanced heat resistance and reduced adhesive force, is not easy to be polluted, and is suitable for being used in a lampshade with high temperature.
drawings
FIG. 1 is a schematic structural view of the present invention;
the lens comprises a lens 1, a shell 2 and a reflector 3.
Detailed Description
The present invention will be described in detail with reference to specific examples below:
a lamp shade of a car lamp with a self-cleaning function comprises a lens 1, a reflector 3 and a shell 2, wherein a transparent self-cleaning coating is coated on the inner surface of the lens, and the self-cleaning coating comprises a micro-erosion layer and a self-cleaning layer. The weight parts of the relevant raw materials of the micro-erosion layer and the self-cleaning layer of the self-cleaning coating of the lens are shown in the following table 1:
TABLE 1
Example 1:
in this example, the raw materials are weighed according to the mixture ratio of example 1 in table 1, and the preparation steps are as follows:
Titanium dioxide pretreatment: cleaning titanium dioxide with particle size of about 20nm with ethanol solution, removing ethanol with clear water, air drying, treating in low temperature plasma equipment with oxygen as working gas under pressure of 1Pa and power of 100W for 1min, and taking out;
(1) Pretreatment: cleaning the surface of a light distribution lens by using 35 wt% ethanol solution, cleaning the surface by using clear water, placing the light distribution lens in an oven, and preheating the light distribution lens to 30 ℃ for later use;
(2) Preparing a micro erosion layer: adding N, N-dimethylformamide into an ethanol solution, uniformly stirring to prepare an N, N-dimethylformamide-ethanol mixed solution, wherein the concentration of N, N-dimethylformamide is 11 wt%, then adding propylene glycol methyl ether, uniformly mixing, then adding pretreated titanium dioxide, stirring at the speed of 1200rpm for 15min to obtain a binding agent, uniformly coating the binding agent on the inner surface of a pretreated lens, coating the thickness of the coating layer to be about 0.1cm, then placing the lens in a constant temperature box at 40 ℃ for constant temperature for 15min, taking out the lens, spraying 0.5 wt% hydrochloric acid solution on the inner surface of the lens, standing for 2min, uniformly coating the binding agent on the inner surface of the lens, coating the thickness of the coating layer to be about 0.05cm, then placing the lens in a constant temperature box at 55 ℃ for constant temperature for 10min, taking out the lens, drying at normal temperature and ventilating to obtain a microetching layer, and measuring Ra to be 20 mu m;
(3) preparation of an aluminum-containing siloxane resin: mixing methyltriethoxysilane and 450 parts by weight of deionized water, heating in a water bath to 40 ℃, adding aluminum isopropoxide and carbodiimide, uniformly stirring, slowly dropwise adding 75 wt% of nitric acid, uniformly stirring, placing in a closed container, stirring and reacting at 70 ℃ for 1h, taking out, adding 25ml of ammonia water with the pH value of 12, heating to 60 ℃, stirring and reacting under the protection of nitrogen for 7h, and cooling to obtain aluminum-containing siloxane resin;
(4) Preparing a self-cleaning layer: and heating the aluminous siloxane resin to a molten state, spraying the aluminous siloxane resin on the surface of the micro-erosion layer of the lens, wherein the coating thickness is about 0.15cm, and standing and curing to obtain the self-cleaning layer on the inner surface of the lens.
Example 2:
In this example, the raw materials are weighed according to the mixture ratio of example 2 in table 1, and the preparation steps are as follows:
titanium dioxide pretreatment: firstly, cleaning titanium dioxide with the particle size of about 25nm by using an ethanol solution, then removing ethanol by using clear water, airing, then placing into low-temperature plasma equipment with oxygen as working gas and the pressure of 1Pa and the power of 100W for treatment for 2min, and then taking out for later use;
(1) Pretreatment: cleaning the surface of a light distribution lens by using 35 wt% ethanol solution, cleaning the surface by using clear water, placing the light distribution lens in an oven, and preheating the light distribution lens to 33 ℃ for later use;
(2) Preparing a micro erosion layer: adding N, N-dimethylformamide into an ethanol solution, uniformly stirring to prepare an N, N-dimethylformamide-ethanol mixed solution, wherein the concentration of N, N-dimethylformamide is 10 wt%, then adding propylene glycol methyl ether, uniformly mixing, then adding pretreated titanium dioxide, stirring at the speed of 1200rpm for 12min to obtain a binding agent, uniformly coating the binding agent on the inner surface of a pretreated lens, coating the thickness of the coating layer to be about 0.1cm, then placing the lens in a thermostat at 42 ℃ for 12min, taking out the lens, spraying a 0.6 wt% hydrochloric acid solution on the inner surface of the lens, standing for 2min, uniformly coating the binding agent on the inner surface of the lens, coating the thickness of the coating layer to be about 0.05cm, then placing the lens in a thermostat at 58 ℃ for 9min, taking out the lens, ventilating and drying at normal temperature to obtain a microetching layer, and measuring Ra to be 15 mu m;
(3) Preparation of an aluminum-containing siloxane resin: mixing methyltriethoxysilane and 320 parts by weight of deionized water, heating in a water bath to 41 ℃, adding aluminum isopropoxide and carbodiimide, uniformly stirring, slowly dropwise adding 75 wt% of nitric acid, uniformly stirring, placing in a closed container, stirring and reacting at 80 ℃ for 1.5h, taking out, adding 22ml of ammonia water with the pH value of 12, heating to 65 ℃, stirring and reacting under the protection of nitrogen for 6.5h, and cooling to obtain the aluminosiloxane resin;
(4) Preparing a self-cleaning layer: and heating the aluminous siloxane resin to a molten state, spraying the aluminous siloxane resin on the surface of the micro-erosion layer of the lens, wherein the coating thickness is about 0.15cm, and standing and curing to obtain the self-cleaning layer on the inner surface of the lens.
Example 3:
In this example, the raw materials are weighed according to the mixture ratio of example 3 in table 1, and the preparation steps are as follows:
titanium dioxide pretreatment: cleaning titanium dioxide with particle size of about 20nm with ethanol solution, removing ethanol with clear water, air drying, treating in low temperature plasma equipment with oxygen as working gas under pressure of 1Pa and power of 100W for 1min, and taking out;
(1) Pretreatment: cleaning the surface of a light distribution lens by using 35 wt% ethanol solution, cleaning the surface by using clear water, placing the light distribution lens in an oven, and preheating the light distribution lens to 35 ℃ for later use;
(2) preparing a micro erosion layer: adding N, N-dimethylformamide into an ethanol solution, uniformly stirring to prepare an N, N-dimethylformamide-ethanol mixed solution, wherein the concentration of N, N-dimethylformamide is 9 wt%, then adding propylene glycol methyl ether, uniformly mixing, then adding pretreated titanium dioxide, stirring at the speed of 1200rpm for 10min to obtain a binding agent, uniformly coating the binding agent on the inner surface of a pretreated lens, coating the thickness of the coating layer to be about 0.1cm, then placing the lens in a constant temperature oven at 45 ℃ for 10min, taking out the lens, spraying a 1 wt% hydrochloric acid solution on the inner surface of the lens, standing for 3min, uniformly coating the binding agent on the inner surface of the lens again, coating the thickness of the coating layer to be about 0.05cm, then placing the lens in a constant temperature oven at 60 ℃ for 8min, taking out the lens, ventilating and drying at normal temperature to obtain a microetching layer, and measuring Ra to be 12 mu m;
(3) Preparation of an aluminum-containing siloxane resin: mixing methyltriethoxysilane and 300 parts by weight of deionized water, heating in a water bath to 42 ℃, adding aluminum isopropoxide and carbodiimide, uniformly stirring, slowly dropwise adding 75 wt% of nitric acid, uniformly stirring, placing in a closed container, stirring and reacting at 90 ℃ for 2 hours, taking out, adding 20ml of ammonia water with the pH value of 12, heating to 70 ℃, stirring and reacting under the protection of nitrogen for 6.5 hours, and cooling to obtain aluminum-containing siloxane resin;
(4) Preparing a self-cleaning layer: and heating the aluminous siloxane resin to a molten state, spraying the aluminous siloxane resin on the surface of the micro-erosion layer of the lens, wherein the coating thickness is about 0.15cm, and standing and curing to obtain the self-cleaning layer on the inner surface of the lens.
The lamp covers of the car lights and the common polycarbonate lamp covers prepared in examples 1 to 3 were subjected to experiments of dust prevention and volatile organic compound adsorption:
the car lamp covers prepared in examples 1 to 3 and 1 common polycarbonate lamp cover were taken and subjected to the dust-proof test, respectively, and the test methods were as follows: respectively testing and recording the original light transmittance of the lamp shade of the vehicle lamp, then placing the dried lamp shade of the vehicle lamp in an experimental box at 70 ℃, introducing air with the dust content of 50% into the box, taking out the lamp shade after 15min, wiping the outer surface of the lamp shade of the vehicle lamp clean, and testing the light transmittance again to obtain the light transmittance and record the light transmittance together; cleaning the lamp shade with clear water, putting the lamp shade with the wet surface into an experimental box at 70 ℃ again to perform an experiment under the same condition, wiping the outer surface of the lamp shade of the vehicle lamp to be clean, and testing the light transmittance again to obtain a second light transmittance and recording the second light transmittance;
the lamp shade of the car lamp is cleaned and dried, and the experiments of adsorbing volatile organic compounds are respectively carried out, wherein the experiment method comprises the following steps: respectively placing the lamp shade of the automobile lamp in a test box at 70 ℃, then introducing gas generated after the combustion of the butyl sealant into the test box, taking out the lamp shade of the automobile lamp after 24 hours, wiping the outer surface of the lamp shade of the automobile lamp completely, testing the light transmittance again, obtaining and recording the light transmittance, wherein the obtained data are shown in table 2;
The experimental data obtained are shown in table 2:
TABLE 2
as can be seen from table 2, (1) in a dry and dusty environment, the transmittance of the lamp shade of the vehicle lamp prepared in examples 1 to 3 is not greatly reduced, which has a small influence on driving safety, and in a wet and dusty environment, the transmittance is still not large, which has a small influence on driving safety, but the transmittance of the common polycarbonate lamp shade is respectively reduced by 12% and 35%, which hardly has a self-cleaning function, which has a certain influence on driving safety and may cause a potential safety hazard, so that the lamp shade of the vehicle lamp with the self-cleaning function prepared in the present invention has the self-cleaning function, which can prevent the inner surface of the lamp shade from being contaminated;
(2) the experiment that the volatile organic compounds are adsorbed is carried out by simulating the volatile organic compounds by the gas after the burning of the butyl sealant, and the data in the table 2 show that compared with the original light transmittance, the light transmittance is reduced by 3% in the embodiment 1, 3% in the embodiment 2 and 2% in the embodiment 3, and the influence on the driving safety is small, but the light transmittance is reduced by 36% in the common polycarbonate lampshade, the common polycarbonate lampshade hardly has a self-cleaning function, and the common polycarbonate lampshade has the influence on the driving safety and can cause potential safety hazards.
although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (9)
1. the utility model provides a car light lamp shade with self-cleaning function, includes lens, speculum and casing, its characterized in that, the lens internal surface covers there is transparent automatically cleaning coating, the automatically cleaning coating is including eroding layer and self-cleaning layer a little, the micro-erosion layer has unevenness's micro-structure surface, and the roughness Ra on eroding the layer a little is 10-20 mu m, self-cleaning layer is mainly made by the aluminous siloxane resin that methyl triethoxysilane, aluminium isopropoxide and carbodiimide reaction obtained.
2. the lamp cover for a vehicle lamp with a self-cleaning function as claimed in claim 1, wherein the thickness of the self-cleaning coating layer is not more than 0.3 cm.
3. The lampshade of the vehicular lamp with the self-cleaning function as claimed in claim 2, wherein the lens is made of polycarbonate.
4. the lampshade of the vehicle lamp with the self-cleaning function according to claim 3, characterized in that the micro-erosion layer comprises the following raw materials in parts by weight: 50-200 parts of N, N-dimethylformamide, 2-10 parts of propylene glycol methyl ether and 30-70 parts of titanium dioxide, wherein the self-cleaning layer comprises the following raw materials in parts by weight: 150-180 parts of methyltriethoxysilane, 90-108 parts of aluminum isopropoxide and 2.7-5.4 parts of carbodiimide.
5. The lamp cover of vehicular lamp with self-cleaning function as claimed in claim 4, wherein the self-cleaning coating layer on the inner surface of the lens is prepared by the following steps:
(1) pretreatment: preheating the clean lens to 30-35 ℃ in an oven for later use;
(2) preparing a micro erosion layer: adding N, N-dimethylformamide into an ethanol solution, uniformly stirring to prepare an N, N-dimethylformamide-ethanol mixed solution, then adding propylene glycol methyl ether and titanium dioxide, stirring for 10-15min to obtain a binding agent, uniformly coating the binding agent on the inner surface of a pretreated lens, then placing the lens in a constant temperature box at 40-45 ℃ for 10-15min at constant temperature, taking out the lens, spraying 0.5-1 wt% hydrochloric acid solution on the inner surface of the lens, standing for 2-3min, uniformly coating the binding agent on the inner surface of the lens again, then placing the lens in a constant temperature box at 55-60 ℃ for 8-10min at constant temperature, taking out the lens, ventilating and drying at normal temperature to obtain a micro-erosion layer;
(3) Preparation of an aluminum-containing siloxane resin: mixing methyltriethoxysilane and deionized water, heating to 40-42 ℃ in a water bath, adding aluminum isopropoxide, carbodiimide and nitric acid, uniformly stirring, placing in a closed container, stirring and reacting at 70-90 ℃ for 1-2h, taking out, adding ammonia water, heating to 60-70 ℃, stirring and reacting under the protection of nitrogen for 6.5-7h, and cooling to obtain aluminum-containing siloxane resin;
(4) Preparing a self-cleaning layer: and spraying the aluminous siloxane resin on the surface of the micro-erosion layer of the lens, and curing to obtain the self-cleaning layer on the inner surface of the lens.
6. the lamp cover for a vehicle lamp having a self-cleaning function according to claim 5, wherein the concentration of N, N dimethylformamide in the N, N dimethylformamide-ethanol mixed solution is 9 to 11 wt%.
7. The lampshade of the vehicular lamp with the self-cleaning function according to claim 6, wherein the titanium dioxide in the step (2) is pretreated by cleaning the titanium dioxide with an ethanol solution, wherein the titanium dioxide with the particle size of 20-25nm is dried in the air, and then the titanium dioxide is treated in a low-temperature plasma device with the power of 100W and the pressure of 1Pa for 1-2min by using oxygen as a working gas.
8. The lamp cover for a vehicle lamp with a self-cleaning function according to claim 7, wherein in the step (3), the mass ratio of the methyltriethoxysilane to the aluminum isopropoxide is 1:0.6, and the mass ratio of the methyltriethoxysilane to the deionized water is 1 (2-2.5).
9. the lamp cover for a vehicle lamp with a self-cleaning function according to claim 8, wherein in the step (3), the mass ratio of aluminum isopropoxide to carbodiimide is 1 (0.03-0.05).
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