CN116060279A

CN116060279A - Oil-based ink spraying method

Info

Publication number: CN116060279A
Application number: CN202211658262.8A
Authority: CN
Inventors: 林松香; 庄清荣; 吴红
Original assignee: Shenzhen Liguang New Materials Co ltd
Current assignee: Shenzhen Liguang New Materials Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-22
Publication date: 2023-05-05

Abstract

The invention relates to an oily ink spraying method, which utilizes an oily mixture formed by mixing dry powder of carbon nano tubes and carbon black to form an oily extinction light absorption layer by spraying on a substrate in a high-pressure high-atomization mode. The invention can be matched with the preparation and spraying processes of the oily light-absorbing extinction ink, so that the reflection effect of a microstructure formed by the material on a substrate is improved, light is reflected and absorbed for multiple times in the ink layer, and the reflectivity can be effectively reduced.

Description

Oil-based ink spraying method

Technical Field

The invention relates to the application field of oily ink materials, in particular to a spraying method of oily ink.

Background

In the prior art, the light reflectivity of the component needing light absorption extinction, such as low-pressure spraying of light absorption materials, can be obviously reduced at the wavelength of 400-1500nm, and the current emissivity can reach more than 10%. In the application of the lidar, it is necessary to further reduce the light emissivity, and it is generally 5% or less, preferably 3% or less.

Therefore, there is a need to provide a method for preparing light absorbing and extinction ink materials and spraying to obtain the light absorbing and extinction effects of components, which can be suitable for equipment with higher requirements for reducing reflectivity, especially laser radar, at high speed and low cost.

Disclosure of Invention

The invention aims to provide an oily ink spraying method, which solves the technical problems that a sprayed light-absorbing extinction material can adapt to the surface of a laser radar and the light emissivity of the laser radar is matched by improving the preparation spraying process, and further solves the technical problems that the process is simplified, the oily light-absorbing extinction material can be quickly formed into a light-absorbing extinction layer meeting the requirement through the preparation spraying process, and the cost is reduced.

The invention achieves the above object by the following technical scheme, and the first aspect provides an oily ink spraying method, comprising the following steps: step S1, mixing and preprocessing carbon nano tubes and carbon black dry powder to obtain mixed dry powder; s2, putting the mixed dry powder into elastic resin, and adding the elastic resin into a corresponding oily solvent for fully mixing to obtain an oily mixture; s3, placing the oily mixture into spraying equipment for pressurization and atomization treatment; and S4, spraying the oily mixture subjected to high pressure and high atomization on a substrate by using spraying equipment, so that carbon nanotubes in an ink layer sprayed on the substrate are in a vertical or relatively vertical form to form a jungle structure in the ink layer, and performing multiple reflection and absorption on the injected light by using the jungle structure.

Wherein the carbon nanotubes have a length of 3 to 12 μm; the carbon black is ketjen black.

Wherein the carbon nanotubes have a length of 5 to 10 μm; the weight proportion of the carbon nano tube in the mixed dry powder is 14-20%.

Wherein, the pressurizing and atomizing treatment of the step S3 includes: the mixture is placed in a spraying device,and pressurized to 3.5kg/cm ² Above, the atomized mixture is formed with the spray apparatus nozzle.

Wherein the pressurization is to 3.5kg/cm ² The above includes: pressurized to 4kg/cm ² Is a high voltage of (a).

The spraying process in the step S4 includes: pressurized to more than 4kg/cm ² And forming a high atomized mixture based on the high pressure and spraying apparatus, spraying the high atomized mixture onto a substrate to form an ink layer having a thickness of 20 to 50 μm.

Wherein the spraying comprises multiple spraying; the ink layer thickness is 30 μm, 30 to 40 μm or 40 μm.

Wherein the carbon nanotubes in the ink layer have a length of 5 to 10 μm; the jungle structural morphology which is vertical or relatively vertical to the substrate and is multi-layered is formed on the high-pressure high-atomization spraying ink layer, so that light can be reflected and absorbed for multiple times in the ink layer, and the overall reflectivity is less than 5%.

The mixing pretreatment process in the step S1 specifically comprises the following steps: mixing for 1-2 hours by combining mechanical stirring and ultrasonic vibration to obtain fully and uniformly mixed dry powder; and/or, the process of obtaining the oily mixture in the step S2 comprises the following steps: and adding the mixed dry powder into water to form slurry, and then putting the slurry into rubber oil for fully mixing to obtain an oily mixture.

Wherein, in step S2, the step of adding the above mixed dry powder into the elastic resin and adding the elastic resin into the corresponding oily solvent for fully mixing comprises the following steps: the mixed dry powder is added into the elastic resin and the corresponding oily solvent to be fully mixed after forming mixed slurry, so as to form an oily mixture, wherein the weight of the mixed slurry in the oily mixture is 25 percent.

Compared with the prior art, the oil light absorption extinction surface, namely the light absorption extinction layer which effectively reduces the light reflectivity, is formed on the parts needing light absorption extinction, particularly the parts with high requirements such as a laser radar and the like, by utilizing the synchronous spraying process when the oil light absorption extinction material is prepared. Specifically, the corresponding mixture is obtained by high-pressure high-atomization spraying after a specific material treatment process, so that the carbon nano tube is positioned on a substrate at a vertical (vertical) or relatively vertical (vertical) angle to form a 20-50 μm basal surface, and the microscopically carbon nano tube forms a densely-distributed jungle-like structure in an ink layer, so that light is reflected and absorbed for multiple times in the ink layer, further more light energy is consumed, the whole can meet the requirement that the reflectivity of a laser radar and the like is less than 5 percent, even less than 3 percent (light with the wavelength of 400-1500 nm), and the range of low-light materials is satisfied, and the glossiness of incident light with the angle of 85 degrees is less than 0.3 and reaches 0.1-0.2.

Drawings

In order to make the technical problems solved by the present invention, the technical means adopted and the technical effects achieved more clear, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted, however, that the drawings described below are merely illustrative of exemplary embodiments of the present invention and that other embodiments of the present invention may be derived from these drawings by those skilled in the art without undue effort.

FIG. 1 is a schematic diagram of the structure of an oily ink sprayed onto a substrate surface to form an ink layer that reduces the reflectance of light.

FIG. 2 is a schematic diagram of a multi-layer structure formed by spraying an oily ink onto a substrate surface.

Detailed Description

Exemplary embodiments of the present invention will now be described more fully. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

The term "and/or" and/or "includes all combinations of any of the associated listed items and one or more.

The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.

Example 1

This example of the present invention forms a light absorbing and matting ink layer by synchronously preparing a spray-coated oily ink onto the surface of a component substrate requiring light absorbing and matting, and mainly comprises: and preparing the mixture by a specific preparation mode and adopting a corresponding matched spraying mode, and spraying the mixture on the surface of the substrate to obtain a corresponding oily light absorption extinction layer. The oily light-absorbing matting layer is simply an ink layer, and is 20 to 50 μm thick, preferably 30, 30 to 40 or 40 μm thick. Wherein, the oily mixture formed after the mixing treatment is used as oily light-absorbing extinction ink, and the ink component of the oily light-absorbing extinction ink is preferably elastic resin (such as rubber oil), carbon nano tubes, carbon black and the like; wherein the length of the carbon nanotube is selected to be 3 to 12 μm, preferably 5 to 10 μm, and the carbon black may be ketjen black. It can adapt to laser radar needs: the reflectance of the reduced light is 5% or less, preferably 3% or less, and especially the glossiness of 0.1.

One embodiment of the oil ink spraying method includes at least two processes, namely, a mixture preparation process and a spray forming process of an ink layer.

Wherein, the preparation process comprises the following steps:

step S1, mixing and preprocessing the carbon nano tube and the carbon black dry powder to obtain mixed dry powder.

Specifically, the pretreatment means includes, but is not limited to, mechanical stirring such as V-blender, ultrasonic vibration mixing, etc., combined for at least 1 to 2 hours to thoroughly and uniformly mix them. The length of the carbon nanotubes is selected to be 3 to 12. Mu.m, preferably 5 to 10. Mu.m, and the carbon black may be Ketjen black or the like. The weight proportion of carbon nanotubes in the dry powder mixture may be from 12% to 22%, preferably from 14% to 20%, more preferably 15%, 18% or 20%.

And S2, putting the mixed dry powder into elastic resin and a corresponding oily solvent, and fully mixing to obtain a mixture.

Specifically, the oily solvent is a nontoxic oily solvent.

In one embodiment, the dry powder mixture is added to a small amount or a proper amount of water, mixed to form slurry, namely mixed slurry, and then sequentially added to the elastic resin and the corresponding oily solvent for fully mixing to obtain the oily mixture. The carbon black and the carbon nano tube molecules in the dry powder mixture can be uniformly dispersed when the carbon black and the carbon nano tube molecules are added into the elastic resin and the corresponding oily solvent for mixing, so that the full mixing and the uniform mixing of the molecules are realized, and the oily mixture is formed. Specifically, the weight ratio of the elastic resin, the oily solvent and the mixed slurry in the oily mixture is about 40-48%, preferably 46%; wherein the weight ratio of the mixed slurry in the oily mixture is about 20% -30%, preferably about 25%, and the weight ratio of the elastic resin and the corresponding oily solvent is about 21%. In the mixed slurry of the oily mixture (e.g., in the 25%), the weight ratio of the carbon nanotubes is 10 to 18%, preferably 15% or so.

In one embodiment, a small/moderate amount of interfacial activator may also be added to the mixed dry powder first. Specifically, the mixed dry powder is added into the solution containing the interfacial agent, or the interfacial agent is added and then water is added, the mixed slurry is obtained after the solvent is fused, the mixed slurry is added into the elastic resin and fully mixed, the oily solvent is added, and the mixture is uniformly stirred to form an oily mixture. Such an oily mixture can be more effective in destroying the interference of a portion of the release agent of the substrate with the adherent coating, and can be more effective in ensuring that the coating of the final mixture adheres to the substrate. Specifically, the weight ratio of the elastic resin, the oily solvent and the mixed slurry in the oily mixture is about 40% -48%, preferably 46%, wherein the weight ratio of the mixed slurry in the oily mixture is 20% -28%, preferably such as 26%, and the weight ratio of the elastic resin and the corresponding oily solvent can be about 20%. In the mixed slurry of the oily mixture (for example, in the 26%), the weight ratio of the carbon nano tube is 14% -16%, preferably 15%, and the weight ratio of the interfacial activator is 2% -4%, preferably 3%.

Further, a filler or an auxiliary agent can be added into the obtained oily mixture to obtain the oily mixture to be sprayed, namely the oily light-absorbing extinction ink.

Further, for the weight ratio of carbon nanotubes in the mixed dry powder, generally about 15% is optimal in testing the reflectance effect.

The oily mixture is the oily light-absorbing extinction ink to be sprayed, and after the oily light-absorbing extinction ink is sprayed on the surface of metal or plastic, the oily light-absorbing extinction ink can be adhered on the surface with the release agent; more preferably, the surface having an extremely thin grid-like plastic molded by a mold release such as an LED can be effectively attached. In particular, the oily mixture prepared from the mixed slurry of the interfacial activator can better eliminate the interference of the release agent on the surface of the plastic.

Wherein, the spraying process comprises the following steps:

and S3, placing the oily mixture into spraying equipment for pressurization and atomization treatment.

In particular, the pressurization is required to a high pressure, in particular, for example, to 3kg/cm ² Above, specifically at 3.5kg/cm ² ～4.5kg/cm ² Preferably 4kg/cm or more ² In particular 4kg/cm ² Etc. Wherein the atomization may be an atomization effect based on the nozzle and pressure of the spraying device.

Further, based on the constitution of the oily light-absorbing extinction ink, the atomization of all carbon nanotubes can be effectively ensured by high pressure, and the high pressure is added to 3kg/cm ² The tubular molecules of the carbon nano tube can be dispersed, and preferably 4kg/cm ² Can ensure that all tubular molecules of the carbon nano tube are dispersed and sufficiently dispersed, and can form a sufficient atomization state with the molecules of the carbon black with the coloring effect.

And S4, spraying the mixture subjected to high-pressure high-atomization on the substrate by using spraying equipment in a high-pressure high-atomization mode, so that the carbon nano tube forms a jungle structure in an ink layer sprayed on the substrate.

Specifically, the atomized oily light-absorbing extinction ink subjected to pressurization and atomization treatment in the equipment is continuously sprayed to a substrate from the spraying equipment in a high-pressure and high-atomization state, and particularly to a part, such as a laser radar, with the reflectivity required to be 5% or even less than 3%. The ink layer sprayed on the substrate in the high pressure and high atomization state has dispersed and enough carbon nanotubes to form one or more layers of jungle-like micro-stereoscopic layered structures. And, the oily light-absorbing extinction ink is kept in spraying in a high-pressure high-atomization state, and the components are mainly carbon nano tubes and carbon black (ketjen black), and the coating is more deeply or blacker.

Wherein the spraying equipment is for instance a paint gun or the like. The pressure to the high pressure may be 4kg/cm or more ² Based on the nozzle diameter and high pressure of the spraying device, the mixture is sprayed onto the substrate layer at high pressure and high atomization to form an oily light absorbing matting ink layer. The spray may be applied in a single pass or multiple passes, with the nozzle of the spray device perpendicular to the substrate, to a selected ink layer thickness at a time, or to a selected thickness at multiple passes. Preferably a plurality of times, the whole is more uniform. Further, the high atomization effect achieved with a high pressure in this range can avoid low pressures, i.e. below 3.5kg/cm ² An atomization effect (such as the following jungle effect) of effective spraying cannot be formed and the blackness of a subsequently sprayed ink layer is insufficient; also, high pressure, i.e. above 4.5kg/cm ² Too much atomization also results in an inability to produce an effective spray atomization and in insufficient jetness of the subsequently sprayed ink layer.

Further, the ink layer is sprayed to a thickness of 20 to 50 μm, preferably 30, 30 to 40, or 40 μm, and, based on high temperature and high pressure spraying, the carbon nanotubes are made to have a large density, plus their preferred length is 5 to 10 μm, enabling dense formation of a jungle state in a vertical/vertical or relatively vertical/vertical direction, even a multi-layered jungle state in the ink layer. Preferably, the carbon nanotubes are in a perpendicular or relatively perpendicular configuration to the substrate. So that the light can be reflected and absorbed for many times in the ink layer, and the overall reflectivity is less than 5 percent and 3 percent (light with the wavelength of 400 to 1500 nm).

Wherein, the high pressure high atomization spraying adopted by the spraying mode is to the mixture, namely the oily light absorption extinction printing ink material, and the high pressure is more than or equal to: 4kg/cm ² . Whereas the existing low pressure is less than 4kg/cm ² Typically 2-3.5kg/cm ² 。

Further, as shown in fig. 1, in the oily light-absorbing extinction ink subjected to high-pressure high-atomization spraying, the carbon nanotubes are positioned on the substrate at a vertical or relatively vertical angle as shown by multi-cluster arrows in fig. 1, in the sprayed ink light-absorbing extinction layer, the carbon nanotubes stand on the surface layer of the underlying substrate, and a jungle-like structure is formed in the ink layer, so that light is absorbed in the ink layer in a multiple reflection manner, and the overall reflectivity is less than 3% (light with a wavelength of 400-1500 nm). In the examples of fig. 1 and 2, the carbon nanotubes are positioned on the substrate at a relatively vertical or vertical angle as shown in fig. 1 to form a coating, which produces a microscopic jungle reflection effect, so that the reflection dispersion of the incident light is large to reduce the reflectivity, the energy of the light is gradually consumed in the jungle, the energy level of the light is gradually reduced, and finally the incident light can not be reflected more or less, so that the reflectivity is low; as shown in FIG. 2, the coating of the carbon nano tube with the microscopic jungle effect stacked in a multi-layer manner has better jungle reflection effect, larger reflection dispersion of incident light and further lower reflectivity compared with the jungle structure with vertical and stacked effects.

And through measurement, the oil light absorption extinction layer is measured by a glossiness meter after spraying, accords with a low glossiness material and a spraying effect thereof, basically has the glossiness of incident light at an angle of 85 degrees of less than 0.3, can reach 0.1-0.2, has the reflectivity of 2-2.6%, and generally has the reflectivity of more than 5% in the prior art, and can completely meet the light absorption extinction requirement of a laser radar by reducing the reflectivity of the oil light absorption extinction layer to below 3%.

The reflectivity of the ink after testing is compared with the reflectivity of the prior art as follows:

comparative example 1

One comparative example of the oil ink spraying method specifically includes two processes, namely, a mixture preparation process and a spraying formation process of an ink layer. Compared with the previous example 1, it is mainly changed in terms of the preparation selection components and the time of the preparation process or the like or in terms of pressurized atomization of the spray coating.

For example, in step S1, the carbon nanotube and the carbon black dry powder are mixed and preprocessed to obtain the mixed dry powder.

Specifically, the pretreatment means includes, but is not limited to, mechanical stirring, ultrasonic vibration mixing, etc., so that they are sufficiently mixed uniformly, for example, less than 1 hour, to a uniform degree or a low uniform degree of density.

Further, the length of the carbon nanotubes is selected to be 3 to 12 μm, 3 to 5 μm or 10 to 12 μm. Selecting a bush layer which is formed later and is too short and dense between 3 mu m and 5 mu m, wherein a three-dimensional structure formed in the later spraying is easy to form a grass shape, and the reflectivity is relatively high; and between 10 and 12 mu m is selected, so that the three-dimensional jungle structure formed in the subsequent spraying process has fewer morphological layers and relatively high reflectivity. Both are less effective than the reflection of the jungle height and hierarchy formed by lengths between 5 and 10 μm. And the carbon black may be ketjen black.

For example, in step S2, the above mixed dry powder is put into an elastic resin and a corresponding oily solvent to be fully mixed, so as to obtain a mixture.

If the weight ratio of the carbon nanotubes to the mixed dry powder is reduced to below 10%, the mixing uniformity is high, but the jungle morphology formed after the subsequent spraying is sparse compared with that of the example 1, the reflectivity is still reduced to a degree not equal to that of the example 1.

For example, in step S4, a high-pressure high-atomization mode is adopted, and the mixture after high-pressure high-atomization is sprayed on the substrate by using a spraying device, so that the carbon nanotubes form a jungle structure in the ink layer sprayed on the substrate. Too high a pressure and too low a pressure do not atomize to an appropriate extent, resulting in insufficient blackening and failure to achieve the effect of reduced reflectivity. For example: pressurizing to high pressure, e.g. 5kg/cm or more ² Based on the nozzle diameter and high pressure of the spraying device, the mixture atomized at high pressure and high pressure is sprayed onto the substrate layer to form an oily light-absorbing extinction ink layer, the atomization of carbon nano tubes and the like is too open due to the larger pressure and high atomization, the spraying time is prolonged, the cost is high, and the whole ink layer is excessively atomized and is not black enough. Also for example: pressurizing to a ratio ofSuch as 2.5kg/cm ² Atomization is also not possible, resulting in an insufficiently black sprayed ink layer.

Further, single spray applications such as spray guns are not as uniform as multiple sprays.

Further, the thickness of the ink layer is sprayed to 20 to 30 μm, or 40 to 50 μm, the former forms an ink layer which has a poor effect of reducing the reflectivity, that is, a poor jungle density, and the latter is costly and a coating layer as a laser radar or the like is relatively thick.

Also, by measurement, the sprayed ink layer conforms to the low-glossiness material and the spraying effect thereof, the reflectivity of the ink layer can be reduced to below 5%, especially below 3%, the glossiness of the incident light basically at an angle of 85 degrees is less than 0.3, more preferably, the glossiness can reach 0.2-0.3, and the requirements of light absorption and extinction of a laser radar are met.

While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. An oil ink spraying method is characterized by comprising the following steps:

step S1, mixing and preprocessing carbon nano tubes and carbon black dry powder to obtain mixed dry powder;

s2, putting the mixed dry powder into elastic resin, and adding the elastic resin into a corresponding oily solvent for fully mixing to obtain an oily mixture;

s3, placing the oily mixture into spraying equipment for pressurization and atomization treatment;

and S4, spraying the oily mixture subjected to high pressure and high atomization on a substrate by using spraying equipment, so that carbon nanotubes in an ink layer sprayed on the substrate are in a vertical or relatively vertical form to form a jungle structure in the ink layer, and performing multiple reflection and absorption on the injected light by using the jungle structure.

2. The method of claim 1, wherein the carbon nanotubes have a length of 3 to 12 μιη; the carbon black is ketjen black.

3. The method of claim 2, wherein the carbon nanotubes have a length of 5 to 10 μιη; the weight proportion of the carbon nano tube in the mixed dry powder is 14-20%.

4. The method according to claim 1, wherein the pressurizing and atomizing process of step S3 includes:

the mixture was placed in a spraying apparatus and pressurized to 3.5kg/cm ² Above, the atomized mixture is formed with the spray apparatus nozzle.

5. The method according to claim 4, wherein the pressurizing is to 3.5kg/cm ² The above includes: pressurized to 4kg/cm ² Is a high voltage of (a).

6. The method according to claim 1, wherein the spraying process of step S4 comprises: pressurized to more than 4kg/cm ² And based on the high pressure and the spraying arrangementThe high-pressure and high-atomization mixture is prepared to form an ink layer with the thickness of 20-50 mu m by spraying the high-pressure and high-atomization mixture on a substrate.

7. The method of claim 6, wherein the step of providing the first layer comprises,

the spraying comprises multiple spraying;

the ink layer thickness is 30 μm, 30 to 40 μm or 40 μm.

8. The method of claim 7, wherein the step of determining the position of the probe is performed,

the carbon nanotubes in the ink layer have a length of 5 to 10 μm;

the jungle structural morphology which is vertical or relatively vertical to the substrate and is multi-layered is formed on the high-pressure high-atomization spraying ink layer, so that light can be reflected and absorbed for multiple times in the ink layer, and the overall reflectivity is less than 5%.

9. The method according to any one of claim 1 to 8, wherein,

the mixing pretreatment process in the step S1 specifically comprises the following steps: mixing for 1-2 hours by combining mechanical stirring and ultrasonic vibration to obtain fully and uniformly mixed dry powder; and/or the number of the groups of groups,

the process for obtaining the oily mixture in the step S2 comprises the following steps: and adding the mixed dry powder into water to form slurry, and then putting the slurry into rubber oil for fully mixing to obtain an oily mixture.

10. The method of claim 9, wherein the step S2 of placing the mixed dry powder into an elastic resin and adding the mixed dry powder into a corresponding oily solvent to be thoroughly mixed comprises:

the mixed dry powder is added into the elastic resin and the corresponding oily solvent to be fully mixed after forming mixed slurry, so as to form an oily mixture, wherein the weight of the mixed slurry in the oily mixture is 25 percent.