the projection paint provided by the invention reflects projection light by using the pigment, so that the contrast and the picture brightness of a projection screen are improved; the projection paint provided by the invention can be coated on any surface to obtain a high-contrast and ultra-clear projection screen, and is convenient and rapid to assemble and install without splicing.

In the present invention, the amount of the pigment to be added is 80 to 120mL, for example, 80mL, 90mL, 100mL, 110mL, 120mL, or the like, based on 250mL of the projection varnish.

Preferably, the pigment is any one of paint, ink, dye or imaging nanoparticles or a combination of at least two thereof.

At present, the projector is generally a laser projector, and the projection light emitted by the laser projector is composed of three monochromatic lasers (red, green and blue).

Preferably, the paint is an acrylic paint and/or a polyurethane paint.

Preferably, the imaging nanoparticles are imaging nanoparticles with a plasmon resonance wavelength of 450nm, imaging nanoparticles with a plasmon resonance wavelength of 560nm, and imaging nanoparticles with a plasmon resonance wavelength of 660 nm.

The incident light irradiates the surface of the imaging nano particle to cause free electrons on the surface of the imaging nano particle to oscillate collectively, when the frequency of the collective oscillation of the electrons is consistent with the frequency of the incident light, resonance, namely plasmon resonance, is generated, at the moment, the incident light energy is effectively transferred into the kinetic energy of the collective oscillation of the electrons, and part of the kinetic energy of the collective oscillation of the electrons is converted into internal energy, namely part of the light is absorbed by the imaging nano particle; another part will radiate as electromagnetic waves, i.e. part of the light is scattered by the imaging nanoparticles. While the incident light portion, which is not converted into the kinetic energy of collective oscillation of the electrons of the imaging nanoparticles, penetrates the imaging nanoparticles in the form of light, i.e., the transmitted light. Both absorption and scattering of incident light by the imaging nanoparticles results in a reduction in the intensity of the incident light, where only scattered light can be observed, and where strong scattering of incident light by the imaging nanoparticles is desirable in order to increase the brightness and contrast of the display screen, with negligible absorption versus scattering.

At the resonance wavelength, the imaging nanoparticles have the strongest absorption and scattering to incident light, so the plasmon resonance wavelength of the imaging nanoparticles should be consistent with the corresponding incident light wavelength. The projection light emitted by the existing projector is composed of three monochromatic lasers (red, green and blue), the wavelengths of the blue laser, the green laser and the red laser are respectively 450nm, 560nm and 660nm, and the plasmon resonance wavelengths of the imaging nano particles correspond to the wavelengths, so that three imaging nano particles with different plasmon resonance wavelengths are selected to correspond to 450nm, 560nm and 660nm one by one, and the purpose of improving the contrast of a display screen is achieved.

The effect of the imaging nanoparticles on the intensity of the incident light can be detected by an ultraviolet-visible spectrophotometer. The ultraviolet-visible spectrophotometer detects the attenuation of incident light intensity of corresponding wavelength, namely the superposition of absorption and scattering, and detects the wavelength with the weakest light intensity, namely the plasmon resonance wavelength of the imaging nano particles. Through theoretical calculation (DDA algorithm, software: ddscat 7.3), the absorption and scattering intensity of the imaging nano-particles at the corresponding wavelength can be obtained.

Preferably, the imaging nanoparticles comprise metal-based nanoparticles.

The addition of silica powder to the projection paint can improve the reflection of the projection paint to light in the visible light region, thereby increasing the gain of the projection screen and improving the brightness of the displayed image.

Preferably, the imaging nanoparticles are any one of or a combination of at least two of silica-coated silver nanoparticles, silver-coated silica nanoparticles, gold nanoparticles, silver nanoparticles, or silver-coated gold nanoparticles.

Preferably, the shape of the imaging nanoparticles is any one or a combination of at least two of spherical, cubic, triangular prism or octahedral.

After the projection paint provided by the invention is coated on the surface of the substrate, the projection coating, namely the pigment in the projection screen can selectively reflect the projection light of the projector, absorb the light with other wavelengths, enhance the reflection of the projection screen to the projection light and the absorption to the ambient light, improve the proportion of the projection light entering human eyes, thereby increasing the contrast of the projection screen and improving the contrast of the projection screen. The traditional projection screen does not distinguish projection light from ambient light, and a displayed image is fuzzy and has low contrast ratio in a strong light environment. The projection paint of the invention effectively overcomes the defect, and can still display high-definition and high-contrast images in a strong light environment.

In the present invention, the amount of the light reflecting agent is 10 to 15g, for example, 10g, 12g, 13g, 14g, 15g, etc., based on 250mL of the projection paint.

Preferably, the light reflecting agent is any one or a combination of at least two of mica, light reflecting powder, titanium dioxide, pearl powder or reflective paint.

Preferably, the reflective paint is a water-soluble reflective paint.

The projection paint provided by the invention comprises a pigment, and the addition of the pigment enables the obtained projection screen to be gray, so that the color display of a projection picture has certain color difference, mainly the wavelength of the displayed red is longer or the frequency is lower, the positive red in a projection image is changed into dark red in the display image. In order to make up for the problem of color difference of displayed images, mica, reflective powder or pearl powder can be added into the projection paint, so that the display effect of a projection screen can be enhanced, the brightness is brighter, and the color is brighter.

The water-soluble reflective paint uses water as a solvent, does not generate volatile substances such as formaldehyde and the like, and is safe and environment-friendly.

In the present invention, the thickener is added in an amount of 15 to 25g, for example, 15g, 18g, 20g, 22g, 25g, etc., based on 250mL of the projection paint.

Preferably, the thickener is polyvinyl alcohol.

In the present invention, the additive is added in an amount of 40 to 60mL, for example, 40mL, 45mL, 50mL, 55mL, 60mL, etc., based on 250mL of the projection paint.

Preferably, the additive is an elastomeric additive and/or a grayness modifier.

Preferably, the elastic additive is any one of polyurethane, polyethylene oxide or polyacrylamide or a combination of at least two of them.

The projection paint provided by the invention is coated on the surface of a soft material, so that a soft and bendable flexible projection screen can be manufactured.

Preferably, the screen gray scale modifier is Liquid Basic (LB) Gold.

In the invention, LB Gold is added into the projection paint, and the color of the projection paint is gradually changed from light gray to dark gray and finally to black as the addition amount is increased. The darker the projection paint color, the lower the display brightness, but the higher the contrast, the light gray projection paint is suitable for use in darker environments, and the dark gray and black projection paints are suitable for use in highlight environments.

Preferably, the projection paint further comprises ultrapure water, and the amount of the ultrapure water added is 80-120mL, such as 80mL, 90mL, 100mL, 110mL, 120mL and the like, based on 250mL of the projection paint.

In a second aspect, the present invention provides a process for the preparation of a projection lacquer as described above, the process comprising: and uniformly mixing the light reflecting agent, the thickening agent, the additive and the pigment to obtain the projection paint.

The preparation method of the projection paint provided by the invention is simple and feasible in process.

In a third aspect, the present invention provides an imaging material comprising a projection paint according to any one of claims 1 to 7.

In a fourth aspect, the present invention provides the use of a projection lacquer as described above in a display screen.

The projection paint provided by the invention can be coated on any surface, preferably the surface with smooth material and flat substrate, and can be brushed, rolled or sprayed, and also can be coated in other modes. If the coated substrate is opaque, the resulting projection screen can be used for a front projection screen, and if the coated substrate is transparent, the resulting projection screen can be used for both front and rear projection screens.

Compared with the prior art, the invention has the following beneficial effects:

the projection paint provided by the invention can be coated on any surface to obtain a high-contrast and ultra-clear projection screen, provides an optimal projection image display effect, is convenient to carry and simple to brush, can be coated in any area and shape according to personal preference, does not need splicing and mounting among screens, and is convenient and rapid; the projection paint provided by the invention utilizes the pigment to selectively reflect the projection light and distinguish the projection light from the ambient light, thereby improving the contrast and the picture brightness of the projection screen.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

In the following examples, LB Napthol Crimso Red, LB Phthalocyanine Green, LB Ultra Marine Blue, LB Gold, Cadmium Yellow, Polyurethane mate Finish, RMA White Peal, RMA Stearling Silver, and Behr 1850UPW Flat were all purchased via the Amazon route.

Example 1

The raw materials for preparing the projection paint provided by the embodiment comprise the following components (based on 250mL of projection paint):

the pigment comprises imaging nanoparticles with plasmon resonance wavelength of 450nm, imaging nanoparticles with plasmon resonance wavelength of 560nm and imaging nanoparticles with plasmon resonance wavelength of 660nm, wherein the imaging nanoparticles are spherical silver nanoparticles; the light reflecting agent is titanium dioxide; the thickening agent is polyvinyl alcohol; the additive is a screen gray scale modifier LB Gold.

The preparation method comprises the following steps:

(1) the spherical silver nanoparticles were synthesized as follows:

a. synthetic silver nanoparticle seeds

50mL of ultrapure water solution contains 5mM trisodium citrate and 0.025mM tannic acid, and is heated to boiling under the condition of condensation and reflux, 125 mu L of 100mM silver nitrate solution is rapidly added, and the boiling is kept for 15 minutes, so that the solution containing the silver nanoparticle seeds is obtained.

b. Preparation of spherical silver nanoparticles

The silver nanoparticle seed solution was cooled to 90 deg.C, then trisodium citrate (200. mu.L 25mM), tannic acid (600. mu.L 2.5mM), and silver nitrate (100. mu.L 100mM) were added to react for 30 minutes, and a small amount of liquid was taken out for UV-visible spectrophotometer detection. This step of adding trisodium citrate (200. mu.L, 25mM), tannic acid (600. mu.L, 2.5mM), and silver nitrate (100. mu.L, 100mM) to react for 30 minutes was repeated until the plasmon resonance wavelength of the synthesized spherical silver nanoparticles was 450nm, the reaction was stopped, the solution was cooled to room temperature, centrifuged and concentrated, and redissolved in ultrapure water to obtain spherical silver nanoparticles.

In the reaction process, an ultraviolet-visible spectrophotometer is used for judging the reaction degree of the synthesized spherical silver nanoparticles, and the reaction is stopped when the plasmon resonance wavelength of the spherical silver nanoparticles is detected to be 450 nm.

Spherical silver nanoparticles having plasmon resonance wavelengths of 560nm and 660nm were synthesized by the above method, respectively.

(2) Preparation of projection paint

And uniformly mixing the light reflecting agent, the thickening agent, the additive and the pigment to obtain the projection paint.

Example 2

the pigment comprises imaging nanoparticles with plasmon resonance wavelength of 450nm, imaging nanoparticles with plasmon resonance wavelength of 560nm and imaging nanoparticles with plasmon resonance wavelength of 660nm, wherein the imaging nanoparticles are triangular prism-shaped silver nanoparticles; the light reflecting agent is 10g of titanium dioxide and 5g of light reflecting powder; the thickening agent is polyvinyl alcohol; the additive is a screen gray scale modifier LB Gold.

The preparation method comprises the following steps:

(1) the triangular prism-shaped silver nanoparticles were synthesized as follows:

adding 1.5mL trisodium citrate (30mM), 1.5mL polyvinylpyrrolidone (0.7mM), 60 μ L hydrogen peroxide (30%) and 100 μ L sodium borohydride (100mM) into 25mL of 0.1mM silver nitrate aqueous solution, stirring at room temperature for reaction, stopping the reaction when the plasmon resonance wavelength is 450nm, centrifuging and concentrating, and dissolving in ultrapure water to obtain triangular prism-shaped silver nanoparticles.

The triangular prism-shaped silver nanoparticles with plasmon resonance wavelengths of 560nm and 660nm are respectively synthesized by the method

(2) Preparation of projection paint

Example 3

the pigment comprises imaging nanoparticles with plasmon resonance wavelength of 450nm, imaging nanoparticles with plasmon resonance wavelength of 560nm and imaging nanoparticles with plasmon resonance wavelength of 660nm, wherein the imaging nanoparticles are silica-coated silver nanoparticles; the light reflecting agent is 2g of titanium dioxide and 10g of light reflecting powder; the thickening agent is polyvinyl alcohol; the additive is a screen gray scale modifier LB Gold.

The preparation method comprises the following steps:

(1) the synthesis of silver-coated silica nanoparticles was as follows:

a. synthetic silica nanospheres

Adding 4mL of tetraethyl orthosilicate and 4mL of strong ammonia water into 50mL of ethanol, stirring at room temperature overnight, centrifuging, washing, and drying the precipitate to obtain the silicon dioxide nanospheres.

b. Synthetic silver-coated silica nanoparticles

Adding the silicon dioxide nanospheres into a 10% hydrochloric acid aqueous solution containing stannous chloride, modifying the surfaces of the silicon dioxide nanospheres by the stannous chloride to enable the surfaces of the silicon dioxide nanospheres to have positive charges, then adding a silver nitrate solution into the modified silicon dioxide nanospheres to perform a chemical reaction: ag⁺+Sn²⁺→Ag0+Sn⁴⁺Part of silver ions are reduced into silver nano particles, the surfaces of the silver nano particles are negatively charged, and the silver nano spheres are adsorbed on the surfaces of the silicon dioxide nano spheres through the attraction effect of positive and negative charges.

And further adding sodium borohydride, completely reducing silver ions into silver nanoparticles, acting for 6 hours at room temperature, centrifugally washing for three times, transferring the silver nanoparticles into a water bath at 90 ℃, adding trisodium citrate and silver nitrate, gradually thickening a silver layer on the surface of the silicon dioxide in the reaction process, detecting the reaction degree by using an ultraviolet visible spectrophotometer, stopping the reaction when the plasmon resonance wavelength of the ultraviolet visible spectrophotometer is 450nm, centrifugally concentrating, and dissolving the silver-coated silicon dioxide nanoparticles in ultrapure water to obtain the silver-coated silicon dioxide nanoparticles.

Silver-coated silica nanoparticles having plasmon resonance wavelengths of 560nm and 660nm were synthesized by the above method, respectively.

(2) Preparation of projection paint

Example 4

the pigment comprises imaging nanoparticles with plasmon resonance wavelength of 450nm, imaging nanoparticles with plasmon resonance wavelength of 560nm and imaging nanoparticles with plasmon resonance wavelength of 660nm, wherein the imaging nanoparticles are spherical silver nanoparticles; the light reflecting agents are 7g of pearl powder, 3g of light reflecting powder and 4g of mica; the thickening agent is polyvinyl alcohol; the additive is a screen gray scale modifier LB Gold.

The preparation method comprises the following steps: and uniformly mixing the light reflecting agent, the thickening agent, the additive and the pigment to obtain the projection paint.

Example 5

wherein the pigment is LB Napthol Crimso Red, LB Phthalocyanine Green, LB Ultra Marine Blue and Cadmium Yellow; the light reflecting agent is titanium dioxide; the thickening agent is polyvinyl alcohol; the additive is a screen gray level regulator LB Gold; in this example, 450mL of the elastomeric additive Polyurethane mate Finish and 1250mL of a reflective paint (RMA White Peal 500mL, RMA Stearling Silver 500mL, and Behr 1850UPW Flat 250mL) were also added.

The applicant states that the invention is illustrated by the above examples to the high definition projection paint of the invention and the preparation method and application thereof, but the invention is not limited to the above examples, that is, the invention is not meant to be implemented by relying on the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The projection paint is characterized in that 250mL of the projection paint is taken as a standard, and the preparation raw material of the projection paint comprises the following components:

the pigment is any one or the combination of at least two of paint, ink, dye or imaging nano particles;

the pigments include three pigments of colors corresponding to red laser, green laser, and blue laser of the laser projector.

2. The projection paint of claim 1, wherein the paint is an acrylic paint and/or a polyurethane-based paint.

3. The projection lacquer according to claim 1 wherein the imaging nanoparticles are imaging nanoparticles having a plasmon resonance wavelength of 450nm, imaging nanoparticles having a plasmon resonance wavelength of 560nm and imaging nanoparticles having a plasmon resonance wavelength of 660 nm.

4. The projection paint of claim 1, wherein the imaging nanoparticles comprise metal-based nanoparticles.

5. The projection paint of claim 4, wherein the imaging nanoparticles are any one or a combination of at least two of silica-coated silver nanoparticles, nanoparticles of 2-6 layer structure consisting of overlapping silver and silica, gold nanoparticles, silver nanoparticles or silver-coated gold nanoparticles.

6. The projection paint of claim 1, wherein the imaging nanoparticles are in the shape of any one or a combination of at least two of spheres, cubes, triangular prisms, or octahedrons.

7. The projection paint of claim 1, wherein the light reflecting agent is any one or a combination of at least two of mica, light reflecting powder, titanium dioxide, pearl powder and light reflecting paint.

8. The projection paint of claim 7, wherein the reflective paint is a water-soluble reflective paint.

9. The projection paint of claim 1, wherein the thickener is polyvinyl alcohol.

10. The projection lacquer according to claim 1, wherein the additive is an elastomeric additive and/or a screen grey scale modifier.

11. The projection paint of claim 10, wherein the elastic additive is any one of polyurethane, polyethylene oxide, or polyacrylamide, or a combination of at least two thereof.

12. The projection paint of claim 10, wherein the screen gray scale modifier is liquid basic Gold.

13. The projection paint of claim 1, wherein the projection paint further comprises ultrapure water, and the amount of the ultrapure water added is 80-120mL based on 250mL of the projection paint.

14. A process for the preparation of a projection lacquer according to any one of claims 1 to 13, characterized in that it is as follows: and uniformly mixing the light reflecting agent, the thickening agent, the additive and the pigment to obtain the projection paint.

15. An imaging material, characterized in that it comprises a projection lacquer according to any one of claims 1-13.

16. Use of a projection lacquer according to any one of claims 1-13 in a display screen.