阅读说明：本技术 一种纳米结构色晶体的筛选方法及筛选装置 (Screening method and screening device for nanostructure color crystals ) 是由 马道远 于 2019-09-23 设计创作，主要内容包括：本申请公开了一种纳米结构色晶体的筛选方法：利用自然沉降的方式去除掉纳米结构色晶体中含有的质量轻的固体杂质。所述筛选方法包括：提供纳米结构色晶体、固体杂质和第一液体混合形成的第一悬浊液；其中,所述固体杂质包括质量小于所述纳米结构色晶体的所有固体物质部分；所述第一悬浊液自然沉降第一预设时间后,形成分层的第一上层混合液和第一下层沉淀物,其中,所述第一上层混合液包含质量小于所述纳米结构色晶体的所述固体杂质,所述第一下层沉淀物包含所述纳米结构色晶体；去除所述第一上层混合液以获得所述第一下层沉淀物。通过上述方式,本申请能够去除掉纳米结构色晶体中含有的质量轻的固体杂质。(The application discloses a screening method of a nano-structure color crystal, which comprises the following steps: and removing light solid impurities contained in the nano-structure color crystals by utilizing a natural sedimentation mode. The screening method comprises the following steps: providing a first suspension formed by mixing the nano-structured color crystals, the solid impurities and the first liquid; wherein the solid impurities comprise all solid matter fractions having a mass less than the nanostructured color crystals; forming a layered first upper layer mixed solution and a layered first lower layer precipitate after the first turbid liquid naturally settles for a first preset time, wherein the first upper layer mixed solution contains solid impurities with mass smaller than that of the nanostructured colored crystals, and the first lower layer precipitate contains the nanostructured colored crystals; and removing the first upper layer mixed solution to obtain the first lower layer precipitate. Through the mode, the light-weight solid impurities contained in the nano-structure color crystals can be removed.)

1. A method of screening nanostructured color crystals, the method comprising:

providing a first suspension formed by mixing the nano-structured color crystals, the solid impurities and the first liquid; wherein the solid impurities comprise a portion of all solid matter having a mass less than the nanostructured color crystals;

forming a layered first upper layer mixed solution and a layered first lower layer precipitate after the first turbid liquid naturally settles for a first preset time, wherein the first upper layer mixed solution contains solid impurities with mass smaller than that of the nanostructured colored crystals, and the first lower layer precipitate contains the nanostructured colored crystals;

and removing the first upper layer mixed solution to obtain the first lower layer precipitate.

2. The screening method of claim 1, wherein providing a first suspension of the nanostructured color crystals, the solid impurities, and the first liquid in combination comprises:

providing the nano-structure color crystals with the particle size meeting the preset condition, the solid impurities and the first liquid, mixing the nano-structure color crystals with the first liquid to form the first turbid liquid, wherein the nano-structure color crystals are formed by stacking multiple layers of films, the solid impurities comprise the nano-structure color crystals with the particle size smaller than the preset condition, and/or the nano-structure color crystals with the particle size meeting the preset condition are solid after falling off at least one film, and/or the nano-structure color crystals with the particle size smaller than the preset condition are solid after falling off at least one film.

3. The screening method according to claim 2, wherein before providing the first suspension of the nanostructured color crystals, the solid impurities, and the first liquid, the first suspension having a particle size satisfying a predetermined condition, the screening method further comprises:

providing an optical film;

crushing the optical thin film to obtain the nano-structure color crystals and the solid impurities with the particle size meeting the preset condition, wherein the solid impurities also comprise the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after at least one film of the nano-structure color crystals with the particle size larger than the preset condition falls off;

and (3) screening the crushed optical thin film by a mesh screen to remove the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after at least one layer of film falls off from the nano-structure color crystals with the particle size larger than the preset condition in the solid impurities.

4. The screening method according to claim 3,

the pulverizing the optical film comprises: putting the optical film into the first liquid for ultrasonic crushing;

the first turbid liquid formed by mixing the nano-structure color crystals with the particle size meeting the preset condition, the solid impurities and the first liquid comprises: and passing the optical film and the first liquid subjected to ultrasonic crushing through a mesh screen to obtain the first suspension.

5. The screening method according to claim 3,

the comminuting the optical film to obtain the nanostructured color crystals comprises: pulverizing the optical film by using air flow;

the step of providing a first suspension formed by mixing the nano-structured color crystals and the first liquid comprises the following steps: and mixing the optical film subjected to jet milling and mesh screening with the first liquid to form the first suspension.

6. The screening method according to claim 1,

the nanostructured color crystals are formed by a multilayer film layer-by-layer arrangement, and the first preset time is inversely related to the number of layers of the multilayer film.

7. The screening method of claim 1, wherein the removing the first supernatant mixture to obtain the first subnatant comprises:

and removing the first upper layer mixed liquid by using a siphon.

8. The screening method of claim 1, wherein after removing the first supernatant mixture to obtain the first subnatant, the screening method further comprises:

mixing the first lower layer precipitate with a second liquid to form a second suspension;

naturally settling the second turbid liquid for a second preset time to form a layered second upper mixed liquid and a layered second lower precipitate;

removing the second upper layer mixed solution to obtain the second lower layer precipitate.

9. A screening apparatus for nanostructured color crystals, the screening apparatus comprising:

the container is used for bearing a first turbid liquid formed by mixing the nano-structure color crystals, the solid impurities and the first liquid and naturally settling the first turbid liquid for a first preset time so as to enable the first turbid liquid to form a layered first upper layer mixed liquid and a layered first lower layer precipitate; wherein the first upper layer mixed liquor contains the solid impurities with a mass smaller than that of the nanostructured color crystals, and the first lower layer precipitate contains the nanostructured color crystals;

and the removing component is used for removing the first upper mixed liquid in the container.

10. The screening apparatus according to claim 9,

the removal assembly comprises a siphon tube; and/or, the container is tapered.

Technical Field

The application relates to the technical field of structural color, in particular to a screening method and a screening device for a nano structural color crystal.

Background

The structural color, also called physical color, is a physical color-generating effect in which a micro-nano structure of a light wavelength scale interacts with light to form interference, diffraction or scattering to generate color. When the nano-structure color crystal is used for pigments, the nano-structure color crystal has a series of important advantages of high brightness, high color saturation, no toxicity, no fading, high temperature resistance, environmental protection and the like.

The inventor of the present application found in the course of long-term research that the existing nanostructured color crystals had excessively fine powder during the manufacturing process, the fine powder failed to normally exhibit color, had low brightness, and was regarded as solid impurities, and thus, it was necessary to reduce the content thereof to the maximum.

Disclosure of Invention

The technical problem mainly solved by the application is to provide a screening method and a screening device for a nano-structure color crystal, which can remove light-weight solid impurities mixed in the nano-structure color crystal by utilizing a natural sedimentation mode.

In order to solve the technical problem, the application adopts a technical scheme that: provided is a screening method of a nanostructured color crystal, the screening method comprising: providing a first suspension formed by mixing the nano-structured color crystals, the solid impurities and the first liquid; wherein the solid impurities comprise all solid matter having a mass less than the nanostructured color crystals; forming a layered first upper layer mixed solution and a layered first lower layer precipitate after the first turbid liquid naturally settles for a first preset time, wherein the first upper layer mixed solution contains solid impurities with mass smaller than that of the nanostructured colored crystals, and the first lower layer precipitate contains the nanostructured colored crystals; and removing the first upper layer mixed solution to obtain the first lower layer precipitate.

Wherein, the first turbid liquid formed by mixing the nano-structure color crystal, the solid impurities and the first liquid comprises: providing the nano-structure color crystals with the particle size meeting the preset condition, the solid impurities and the first liquid, mixing the nano-structure color crystals with the first liquid to form the first turbid liquid, wherein the nano-structure color crystals are formed by stacking multiple layers of films, the solid impurities comprise the nano-structure color crystals with the particle size smaller than the preset condition, and/or the nano-structure color crystals with the particle size meeting the preset condition are solid after falling off at least one film, and/or the nano-structure color crystals with the particle size smaller than the preset condition are solid after falling off at least one film.

Before providing the first suspension formed by mixing the nanostructured color crystals with the particle size satisfying the preset condition, the solid impurities and the first liquid, the screening method further includes: providing an optical film; crushing the optical thin film to obtain the nano-structure color crystals and the solid impurities with the particle size meeting the preset condition, wherein the solid impurities also comprise the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after at least one film of the nano-structure color crystals with the particle size larger than the preset condition falls off; and (3) screening the crushed optical thin film by a mesh screen to remove the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after at least one layer of film falls off from the nano-structure color crystals with the particle size larger than the preset condition in the solid impurities.

Wherein said comminuting the optical film comprises: putting the optical film into the first liquid for ultrasonic crushing; the first turbid liquid formed by mixing the nano-structure color crystals with the particle size meeting the preset condition, the solid impurities and the first liquid comprises: and passing the optical film and the first liquid subjected to ultrasonic crushing through a mesh screen to obtain the first suspension.

Wherein the comminuting the optical film to obtain the nanostructured color crystals comprises: pulverizing the optical film by using air flow; the step of providing a first suspension formed by mixing the nano-structured color crystals and the first liquid comprises the following steps: and mixing the optical film subjected to jet milling and mesh screening with the first liquid to form the first suspension.

Wherein the nanostructured color crystals are formed by a multilayer film layer-by-layer arrangement, and the first preset time is inversely related to the number of layers of the multilayer film.

Wherein the removing the first upper layer mixed solution to obtain the first lower layer precipitate includes: and removing the first upper layer mixed liquid by using a siphon.

After removing the first upper layer mixed solution to obtain the first lower layer precipitate, the screening method further includes: mixing the first lower layer precipitate with a second liquid to form a second suspension; naturally settling the second turbid liquid for a second preset time to form a layered second upper mixed liquid and a layered second lower precipitate; removing the second upper layer mixed solution to obtain the second lower layer precipitate.

In order to solve the technical problem, the application adopts another technical scheme that: providing a screening apparatus for nanostructured color crystals, the screening apparatus comprising: the container is used for bearing a first turbid liquid formed by mixing the nano-structure color crystals, the solid impurities and the first liquid and naturally settling the first turbid liquid for a first preset time so as to enable the first turbid liquid to form a layered first upper layer mixed liquid and a layered first lower layer precipitate; wherein the first upper layer mixed liquor contains the solid impurities with a mass smaller than that of the nanostructured color crystals, and the first lower layer precipitate contains the nanostructured color crystals; and the removing component is used for removing the first upper mixed liquid in the container.

Wherein the removal assembly comprises a siphon tube; and/or, the container is tapered.

The beneficial effect of this application is: in contrast to the prior art, the first suspension provided by the present application includes a nanostructured color crystal, a solid impurity and a first liquid, and the solid impurity includes a portion having a mass smaller than that of the nanostructured color crystal. Because the mass of the solid impurities is less than that of the nanostructure color crystals, the settling time of the solid impurities with light mass in the first turbid liquid is longer than that of the nanostructure color crystals, and the solid impurities can be effectively separated from the nanostructure color crystals by controlling the settling time so as to achieve the purification effect; in addition, because the weight of the superfine powder is light and is smaller than that of the nano-structure color crystals, the superfine powder in the nano-structure color crystals can be effectively screened out in the mode, and the brightness of the pigment formed by the subsequent nano-structure color crystals is further improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic flow chart of one embodiment of a method for screening nanostructured color crystals according to the present invention;

fig. 2 is a schematic structural diagram of an embodiment of the apparatus for screening nanostructured color crystals according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a screening method for nanostructured color crystals according to the present invention, the screening method comprising:

s101: providing a first suspension formed by mixing the nano-structured color crystals, the solid impurities and the first liquid; wherein the solid impurities include all solid matter having a mass less than the nanostructured color crystals.

Specifically, the nanostructure color crystals may be formed by a multilayer film lamination arrangement, and the structure of the nanostructure color crystals may be any one of the prior art, for example, the nanostructure color crystals are formed by Cr, 4L, Cr, 4L, Cr lamination arrangement, wherein L is silicon dioxide; for another example, the nanostructured color crystal is formed by stacking Cr, 4L, Ag, and 4L, Cr, where L is magnesium fluoride.

In one embodiment, the step S101 specifically includes: providing a first turbid liquid formed by mixing nano-structure color crystals with the particle size meeting the preset condition, solid impurities and a first liquid, wherein the solid impurities comprise the nano-structure color crystals with the particle size smaller than the preset condition, and/or solid formed after the nano-structure color crystals with the particle size meeting the preset condition fall off at least one film (for example, solid formed after two Cr layers on the outermost side of the nano-structure color crystals fall off), and/or solid formed after the nano-structure color crystals with the particle size smaller than the preset condition fall off at least one film. The mass of the solid impurities is lighter than that of the nano-structure color crystal with the particle size meeting the preset condition.

In order to provide the first suspension formed by mixing the nanostructure color crystals with the particle size satisfying the preset condition, the solid impurities and the first liquid, the screening method provided by the present application further includes, before the step S101:

A. an optical film is provided. Specifically, the process of providing the optical film may be: providing a base layer which can be a transparent glass substrate, polyethylene hard plastic and the like; forming a multilayer film on the base layer by vacuum coating (e.g., electron beam evaporation, thermal evaporation, etc.); and stripping off the base layer to form the optical film with the multilayer film.

B. And crushing the optical film to obtain the nano-structure color crystals with the particle size meeting the preset condition and solid impurities, wherein the solid impurities can comprise the impurities with lighter weight than the nano-structure color crystals with the particle size meeting the preset condition, and also can comprise the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after the nano-structure color crystals with the particle size larger than the preset condition fall off at least one film.

C. And (3) screening the crushed optical film by a mesh screen to remove the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after at least one layer of film is peeled off from the nano-structure color crystals with the particle size larger than the preset condition in the solid impurities.

In an application scenario, the process of crushing the optical film in the step B specifically includes: putting the optical film into first liquid for ultrasonic crushing; the process of obtaining the first suspension may be: and (3) passing the optical film and the first liquid after ultrasonic crushing through a mesh screen to remove the nano-structure color crystals with the particle size larger than the preset condition and/or the solid formed after at least one layer of film is peeled off from the nano-structure color crystals with the particle size larger than the preset condition in the solid impurities, and forming the first suspension liquid on the rest part. Further, in the present embodiment, the size of the mesh screen may be selected according to the use of the nanostructured color crystals, for example, when the nanostructured color crystals are used as a spray pigment, the mesh screen may be a 100-mesh screen; when the nanostructured color crystals are used in printing pigments, the mesh screen may be a 500 mesh screen.

In another application scenario, the process of crushing the optical film in the step B specifically includes: crushing the optical film by using air flow, wherein the crushed optical film is solid powder; the process of obtaining the first suspension may be: and mixing the optical film subjected to the air flow crushing and the mesh screening with a first liquid to form a first suspension.

In another embodiment, the step C of passing the pulverized optical thin film through a mesh screen may not be performed, and the step of passing through the mesh screen may be performed after removing solid impurities having a mass smaller than that of the nanostructured color crystals, which is not limited in the present application.

S102: and naturally settling the first turbid liquid for a first preset time to form layered first upper mixed liquid and first lower precipitate, wherein the first upper mixed liquid contains solid impurities with mass smaller than that of the nano-structure color crystals, and the first lower precipitate contains the nano-structure color crystals.

Specifically, the solid impurity ultrafine powder with the mass smaller than that of the nano-structure color crystal naturally settles slowly in the solution and can be screened out, and the principle is as follows: the solid impurities with the mass smaller than that of the nano-structure color crystals have smaller particle size and larger specific surface area, wherein the specific surface area refers to the surface area of the unit mass of an object. The object with larger specific surface area in the solution is more fully contacted with the solvent molecules, the collision action of the thermal motion (Brownian motion) of the solvent molecules is larger, the additional irregular motion is more obvious, so the action of gravity is weakened, and the sinking speed is slower.

In the natural sedimentation process of the first turbid liquid, the sedimentation speed of the light solid impurities is smaller than that of the nano-structure color crystals, so that the aim of separating the nano-structure color crystals from the light solid impurities is fulfilled by controlling the first preset time; when the light-weight solid impurities are ultrafine powder, the ultrafine powder can be separated from the nano-structured color crystals in the manner, so that the brightness of the pigment prepared from the subsequently obtained nano-structured color crystals is higher.

In this embodiment, the first preset time is inversely related to the number of layers of the multilayer film of the nanostructured color crystals, i.e., the larger the number of layers of the multilayer film of the nanostructured color crystals, the larger the mass thereof, and the shorter the first preset time; the first preset time may be 5 minutes, 10 minutes, and the like, and may be specifically set according to actual conditions.

S103: and removing the first upper layer mixed solution to obtain a first lower layer precipitate.

Specifically, in one embodiment, the step S103 specifically includes: the first upper mixed liquid is removed by a siphon. Wherein, the siphon is the used return bend of making liquid produce siphonage, and specific use process can be: the siphon is first inserted into the first upper mixed liquid, preferably with the end of the siphon inserted at the interface between the first upper mixed liquid and the first lower sediment, so as to remove as much of the first upper mixed liquid as possible.

Of course, in other embodiments, other means may be used, such as a pipe and pump combination to remove the first supernatant mixture.

In yet another embodiment, the natural settling process may be further repeated, once, twice, etc., in order to remove the light-weight solid impurities more thoroughly. Specifically, after the step S103, the screening method provided by the present application further includes:

A. mixing the first lower layer precipitate with a second liquid to form a second suspension; in particular, the second liquid may be the same as the first liquid, e.g., both the first liquid and the second liquid may be water.

B. Naturally settling the second turbid liquid for a second preset time to form a layered second upper mixed liquid and a layered second lower precipitate; specifically, the second preset time and the first preset time may be the same.

C. Removing the second upper layer mixed solution to obtain a second lower layer precipitate; specifically, after the second lower precipitate is obtained, the second lower precipitate may be dried to obtain nanostructured colored crystals with light-weight solid impurities removed. If the solid impurities with the particle size larger than the preset condition are not removed by the mesh screen in the step S101, the step C is followed by a step of processing the dried second lower layer precipitate by the mesh screen.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a screening apparatus for nanostructured color crystals according to the present invention, the screening apparatus comprising:

the container 10 is used for bearing a first turbid liquid formed by mixing the nano-structure color crystals, the solid impurities and the first liquid and naturally settling the first turbid liquid for a first preset time so as to enable the first turbid liquid to form a layered first upper layer mixed liquid and a layered first lower layer precipitate; wherein the first upper layer mixed solution contains solid impurities with mass smaller than that of the nano-structure color crystals, and the first lower layer precipitate contains the nano-structure color crystals. In this embodiment, the vessel 10 may be tapered, i.e., the open area of the vessel 10 is smaller than the bottom area of the vessel 10, resulting in less solids remaining on the inner walls of the vessel 10.

And a removing component 12 for removing the first upper mixed liquid in the container 10. In the present embodiment, the removing assembly 12 includes a siphon tube 120, and the siphon tube 120 can remove the first upper mixed liquid in the container 10 by a siphon effect.

The screening device of the nano-structure color crystal provided by the application has a simple structure and is easy to assemble.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.