CN113376890A

CN113376890A - Intelligent atomized glass with low driving voltage and preparation process thereof

Info

Publication number: CN113376890A
Application number: CN202110715502.2A
Authority: CN
Inventors: 王鹏飞; 胡志诚; 罗威; 谢龙豪
Original assignee: Shaoxing Difei New Material Co ltd
Current assignee: Shaoxing Difei New Material Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-09-10
Anticipated expiration: 2041-06-28
Also published as: CN113376890B

Abstract

The application relates to intelligent atomized glass with low driving voltage and a preparation process thereof. The intelligent atomization glass with low driving voltage comprises a first transparent layer, an atomization layer and a second transparent layer which are sequentially arranged, wherein the atomization layer at least comprises the following raw materials in parts by mass: 30-50 parts of a photo-curing polymer; 50-70 parts of liquid crystal; 0.1-0.3 part of magnetic graphene; 0.1-0.2 parts of surfactant; 2-5 parts of a photoinitiator. The preparation method comprises the following steps of firstly, dispersing magnetic graphene to obtain a dispersion liquid; step two, preparing a membrane layer to obtain membrane liquid; step three, assembling, namely coating the film liquid on a first transparent layer, and covering a second transparent layer on the first transparent layer to obtain semi-finished glass; and step four, curing, namely obtaining the dimming glass after ultraviolet curing. The dimming glass has the effect that operating voltage is lower.

Description

Intelligent atomized glass with low driving voltage and preparation process thereof

Technical Field

The application relates to the field of dimming glass, in particular to intelligent atomization glass with low driving voltage and a preparation process thereof.

Background

The color-changing glass is also called as light-adjusting glass or transmittance-adjustable glass, and refers to glass which can change color under certain conditions such as illumination, current, external pressure, temperature, magnetic field and the like, the color of the glass changes along with the change of external conditions, and the glass can be reversibly and automatically restored to the initial state after the external conditions disappear.

The conventional dimming glass schemes on the market at present comprise PDLC (polymer dispersed liquid crystal), EC (electrochromism) and the like, and the technical indexes of the dimming glasses have advantages and disadvantages. PDLC is a structure formed by mixing low molecular liquid crystal and prepolymer, and carrying out polymerization reaction under a certain condition to enable the liquid crystal and the polymer to generate phase separation, wherein liquid crystal microdroplets are uniformly dispersed in a cross-linked polymer network. The PDLC light control glass has a color change mechanism in which liquid crystal molecules dispersed in a polymer are oriented in a disordered state when no external voltage is applied, and at this time, incident light is strongly scattered, and when a certain voltage is applied, the liquid crystal molecules are oriented in the direction of an electric field, and at this time, the incident light can directly pass through.

There are many factors affecting the performance of PDLC light control glass, such as the type of reactive diluent, the type of liquid crystal, the type of monomer, the ratio of monomer to resin, etc., but the mechanism of color change determines that under the action of an applied voltage, the liquid crystal is deflected in the polymer to overcome the resistance between the polymer and the liquid crystal. The final result is that the working voltage of most of the PDLC principle dimming glasses is too high, and the driving voltage of the common epoxy and polyester PDLC dimming glasses is even as high as about 50V. The excessively high operating voltage is one of the reasons that limit the wide-range use of PDLC dimming glasses.

Disclosure of Invention

In order to solve the problem that the working voltage of the conventional light-adjusting glass based on the PDLC principle is too high, the application provides the intelligent atomization glass with low driving voltage and the preparation process thereof.

First aspect, the application provides a low drive voltage's intelligent atomizing glass, adopts following technical scheme:

the utility model provides a low drive voltage's intelligent atomizing glass, is including the first stratum lucidum, atomizing layer, the second stratum lucidum that set gradually, atomizing layer includes the raw materials of following parts by mass at least:

through adopting above-mentioned technical scheme, the magnetic graphene of additionally adding, although can reduce the visible light transmissivity of atomizing layer by a small amount, influence its optical property, but its drive voltage that can greatly reduced light control glass. This is probably because the addition of the magnetic graphene can establish a built-in potential within the atomizing layer, thereby reducing the driving voltage of the atomizing layer; in addition, magnetism graphite alkene can produce electromagnetic induction phenomenon, and behind the external voltage, magnetism graphite alkene can move towards near electric field direction under the effect of electric field to change the distribution of liquid crystal in the atomizing layer, except that liquid crystal itself receives the influence drive steering of external voltage promptly, magnetism graphite alkene receives the influence of external voltage also can drive the liquid crystal steering, and under the effect of multiple drive power, the liquid crystal is changeed and is overcome the resistance and take place the rotation, thereby makes driving voltage reduce.

Compared with the method of simply adding the magnetic material, the graphene is better in conductivity, the magnetic material is loaded on the graphene, and through the matching of the magnetic material and the graphene conductivity, a lower driving voltage can be obtained with a lower addition amount, so that the influence on the visible light transmittance is reduced. The influence of the graphene on the visible light transmittance is far smaller than that of a common magnetic material, and the influence on the transmittance of the dimming glass is greatly reduced after the magnetic material is loaded on the graphene.

Furthermore, due to the fact that the graphene has good conductive performance, the conductivity of the atomized layer can be improved due to the addition of the magnetic graphene, the response speed of the atomized layer can be improved due to the improvement of the conductivity, the power consumption of the intelligent atomized glass can be greatly reduced, and the application range of the intelligent atomized glass with low working voltage and low power consumption is greatly expanded.

Optionally, the photocurable polymer comprises the following components in percentage by mass:

0.5-1% of ammonium zirconium carbonate;

38-42% of lauryl methacrylate;

the balance of polyester acrylic resin.

By adopting the technical scheme, the polyester acrylic resin and the lauryl methacrylate monomer are selected specifically, so that the polyester acrylic resin and the lauryl methacrylate monomer have good transmissivity and compatibility, and can form a uniform transparent atomized layer.

The use amount of the polyester acrylic resin and the lauryl methacrylate monomer must be strictly controlled, because if the use amount of the polyester acrylic resin is too much, the crosslinking degree of the polymer formed after curing is too large, the density is high, the volume of the liquid crystal microdroplet is too small, the liquid crystal microdroplet is not easy to rotate, and the driving voltage is improved. If the amount of the lauryl methacrylate monomer is too large, the driving voltage is reduced, but the contrast and mechanical properties of the matte layer are also reduced.

Further, the inventors have found that when the moisture in the system is too high due to a high environmental humidity or insufficient drying of the monomer, the entire system is whitened, and the excessive moisture affects the polymerization degree during polymerization of the system, and the performance of the finally produced matte layer is easily affected. Ammonium zirconium carbonate is a good water repellent agent without toxic and side effects, and the ammonium zirconium carbonate is added into a system, so that the water resistance of the system can be improved, the water content of the system can be reduced, and the anti-foaming performance of the system can be improved. And the ammonium zirconium carbonate is transparent, has little influence on the transmissivity of the atomized layer and has better compatibility with the whole system.

Optionally, the preparation process of the magnetic graphene comprises the following process steps:

s1, blending, namely dissolving graphene oxide in deionized water to obtain a graphene oxide solution; dissolving ferrous chloride tetrahydrate and ferric chloride hexahydrate in deionized water to obtain an iron ion solution; uniformly mixing the graphene oxide solution and the iron ion solution to obtain a mixed solution;

s2, depositing, namely, dropwise adding ammonia water into the mixed solution obtained in the step S1, heating, stirring and depositing for a certain time to deposit the nano ferroferric oxide on the graphene oxide to obtain a deposition solution;

and S3, reducing, namely adding a reducing agent into the deposition solution obtained in the step S2, and reacting for a certain time to obtain the magnetic graphene.

By adopting the technical scheme, the ferroferric oxide, also called magnetite, has good magnetic performance, and the graphene also has good magnetic performance after the nano ferroferric oxide is loaded on the graphene. Mixing ferrous chloride tetrahydrate and ferric chloride hexahydrate according to a certain proportion to obtain an iron ion solution, and mixing the iron ion solution and the graphene oxide solution, wherein the iron ions can be adsorbed by the graphene oxide. And (3) dropwise adding ammonia water to adjust the pH value of the system, precipitating iron ions adsorbed on the graphene oxide to obtain nano ferroferric oxide, and reducing to obtain the magnetic graphene.

Optionally, in step S1, the iron chloride tetrahydrate is prepared according to a molar ratio: the ferric chloride hexahydrate is 3: 4.

By adopting the technical scheme, the nano ferroferric oxide with higher yield can be obtained under the condition of the mixture ratio. This is probably because, although the reaction molar ratio of ferrous ions to ferric ions is theoretically 1:2, ferrous ions are easily oxidized to ferric ions in the actual production process, and therefore, the amount of ferrous ions added to the system needs to be increased appropriately.

Optionally, in step S3, the reducing agent used is ascorbic acid.

By adopting the technical scheme, the reducing agent has small toxic and side effects, and is different from common reducing agents with large toxic and side effects such as hydrazine hydrate and the like.

Optionally, the step S2 specifically includes the following process steps:

s21, primary deposition, namely, dropwise adding ammonia water into the mixed solution obtained in the step S1, and then heating and stirring to obtain primary deposition solution;

s22, secondary deposition, namely, continuously dropwise adding ammonia water into the primary deposition liquid obtained in the step S21, and stirring at a constant temperature to obtain a secondary deposition liquid;

and S23, depositing for the third time, adding small molecular organic acid salt into the secondary deposition solution obtained in the step S22, adjusting the pH value of the system to 4-5, and stirring at a constant temperature to obtain the deposition solution.

By adopting the technical scheme, as the nano ferroferric oxide is enriched near the graphene oxide, the local concentration is high, the high-concentration nano ferroferric oxide is easy to agglomerate, once the nano ferroferric oxide is agglomerated, the optical performance of the finally obtained atomized layer can be influenced, and gaps of the graphene oxide can be blocked. The three-time deposition process is specifically selected because ammonia water is dripped twice and deposited, and the nano ferroferric oxide deposited once is less, so that the local concentration of the nano ferroferric oxide is reduced, and the possibility of agglomeration of the nano ferroferric oxide due to enrichment in a short time is greatly reduced.

The reason why the small-molecule organic acid salt is further added for further deposition is that part of the nano ferroferric oxide which is not adsorbed by the graphene oxide is suspended in the system, the small-molecule organic acid salt can modify the nano ferroferric oxide, and a certain adsorption effect exists between the small-molecule organic acid salt and the graphene oxide, so that the suspended nano ferroferric oxide can be promoted to be adsorbed by the graphene oxide, and the loading rate of the nano ferroferric oxide on the graphene oxide is improved. The surface of the modified nano ferroferric oxide has a protective layer, so that the possibility of agglomeration of the nano ferroferric oxide can be further reduced, and the possibility of oxidation of the nano ferroferric oxide can also be reduced.

Optionally, the small-molecule organic acid salt is a mixture of sodium humate and ammonium citrate.

By adopting the technical scheme, the inventor unexpectedly finds that when ammonium citrate is added, the driving voltage of the intelligent atomization glass is obviously reduced. And the inventor observes that when the ammonium citrate is added, the volume of the liquid crystal droplets in the atomization layer is obviously increased, and the larger volume of the liquid crystal droplets means that the contact area between the liquid crystal and the polymer is reduced, and the resistance of the liquid crystal during rotation is reduced, so that the driving voltage of the intelligent atomization glass is reduced. This is probably because the curing speed of the photo-curable polymer is fast, so that the precipitated liquid crystal is rapidly divided into droplets with small volume, the adjacent liquid crystal droplets cannot be communicated with each other, and finally the liquid crystal droplets in the atomization layer have small volume and large rotation resistance. The ammonium citrate and the ammonium zirconium carbonate in the photocuring polymer have a certain synergistic polymerization inhibition effect, a certain polymerization delaying effect is generated, the polymerization process of the photocuring polymer in the atomization layer is delayed, full precipitation of liquid crystals is facilitated, and the liquid crystals are gathered and become liquid crystal droplets with larger volumes because the liquid crystals are not completely separated in a short time.

In addition, the ammonium citrate can modify the nano ferroferric oxide, and after the ammonium citrate modifies the nano ferroferric oxide, the magnetism of the obtained product is superior to that of the unmodified nano ferroferric oxide and the product is less prone to agglomeration. Ammonium radicals and graphene oxide groups have strong hydrogen bond effects, so that ammonium citrate can be strongly adsorbed by graphene oxide, and the nano ferroferric oxide suspended and modified by the ammonium citrate is strongly attracted by the graphene oxide, so that the load rate of the nano ferroferric oxide on a graphene oxide line is greatly improved, and the magnetism of the finally prepared magnetic graphene is improved.

After the pH value of the system is adjusted to 4-5, the pH value is less than the equipotential of the nano ferroferric oxide, the nano ferroferric oxide is positively charged, the graphene oxide is negatively charged, and the nano ferroferric oxide and the graphene oxide are attracted to each other, so that the free nano ferroferric oxide is adsorbed by the graphene oxide.

Under the condition, good adsorption can be formed between the nano ferroferric oxide and the humic acid. Due to the fact that the graphene oxide contains carbon-carbon double bonds, proton complexation of a pi electron system in a water environment plays a key role in adsorbing negatively charged groups of humic acid. On the other hand, other functional groups of graphene oxide, such as carboxyl and hydroxyl groups, form strong hydrogen bonds with amino and hydroxyl groups in humic acid, and the like, so that graphene oxide forms strong adsorption on humic acid. That is to say, humic acid is used as a medium, and nano ferroferric oxide is easier to be adsorbed by oxidized graphene, so that the loading rate of nano ferroferric oxide on the oxidized graphene is greatly improved.

Optionally, in the step S21, ammonia water is added dropwise until the pH of the system is 9 to 9.5; in the step S22, ammonia water is added dropwise until the pH value of the system is 10-11.

By adopting the technical scheme, the dropwise adding amount of the ammonia water in the step S21 and the step S22 is controlled because the nano ferroferric oxide is deposited at an excessively high speed if the pH value of the system is too large, and the nano ferroferric oxide is not easy to separate out and deposit if the pH value of the system is too small. When the pH value of the system is 9-9.5, the nano ferroferric oxide is precipitated at a lower speed, so that the possibility of agglomeration of the nano ferroferric oxide is reduced; and then controlling the pH value of the system to be 10-11, and further separating out and depositing the nano ferroferric oxide. The nano ferroferric oxide is orderly separated out and deposited on the graphene oxide, so that the possibility of agglomeration of the nano ferroferric oxide is reduced.

Optionally, the surfactant is lecithin.

By adopting the technical scheme, the lecithin is an amphoteric surfactant, and the compatibility of each component in the system can be improved. In addition, the inventor finds that the specific selection of lecithin as the surfactant can also obviously improve the antioxidant performance of the system, which is probably due to the synergistic antioxidant effect of the lecithin, the ascorbic acid and the ammonium citrate. Once the nano ferroferric oxide is oxidized into the ferric oxide, the performance of the nano ferroferric oxide is changed to a great extent, and the performance of the atomization layer is influenced.

In a second aspect, the present application provides a process for preparing intelligent atomized glass with low driving voltage, which adopts the following technical scheme:

a preparation process of intelligent atomized glass with low driving voltage comprises the following process steps:

step one, dispersing magnetic graphene, namely putting the magnetic graphene into ethanol for dispersing to obtain a dispersion liquid;

step two, preparing a film layer, namely uniformly mixing a photo-curing polymer, a liquid crystal, a surfactant and a photoinitiator according to a ratio, adding the dispersion liquid obtained in the step one for ultrasonic dispersion, and obtaining the film liquid after the dispersion is finished;

step three, assembling, namely coating the membrane liquid obtained in the step two on a first transparent layer, drying the first transparent layer coated with the membrane liquid, and covering a second transparent layer on the first transparent layer to obtain semi-finished glass;

and step four, curing, namely curing the semi-finished glass obtained in the step three under ultraviolet light to obtain the dimming glass after curing is finished.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the magnetic graphene is additionally added in the atomization layer, so that the driving voltage and the power consumption of the dimming glass can be greatly reduced;

2. the possibility of overhigh water content of a system can be reduced by specifically adding ammonium zirconium carbonate into the photo-curing polymer;

3. by specially limiting the deposition process of the nano ferroferric oxide on the graphene oxide, the possibility of nano ferroferric oxide agglomeration is greatly reduced, and the load rate of the nano ferroferric oxide on the graphene oxide is improved;

4. by limiting the small-molecule organic acid salt added during the third deposition to be the mixture of sodium humate and ammonium citrate, the driving voltage can be further reduced, and the load rate of the nano ferroferric oxide on the graphene oxide is improved;

5. by limiting the added surfactant to be lecithin, the compatibility of each component in the system can be improved, and the possibility of oxidation of the nano ferroferric oxide can be reduced by the synergy of the surfactant, ascorbic acid serving as a reducing agent and ammonium citrate added during three-time deposition.

Detailed Description

The present application will be described in further detail with reference to the following preparation examples, examples and comparative examples.

The sources of the raw materials used in the examples and comparative examples are reported in the following table

Except for the raw materials described in the above table, raw materials not described in the table are all available on the market conventionally.

Preparation example of magnetic graphene

Preparation example 1

S1, blending, specifically,

and dissolving graphene oxide in deionized water for ultrasonic dispersion, wherein 1.2g of graphene oxide is added in each 1L of deionized water. And (3) carrying out ultrasonic treatment at the ultrasonic power of 300W for 30min, centrifuging at the centrifugal rotation speed of 7000rmp after ultrasonic treatment, taking supernatant after centrifuging, and introducing nitrogen for 30min to remove oxygen in the solution, so as to obtain the graphene oxide solution for later use.

Dissolving ferrous chloride tetrahydrate and ferric chloride hexahydrate in deionized water, adding 0.15mol of ferrous chloride tetrahydrate and 0.2mol of ferric chloride hexahydrate in each 1L of deionized water, stirring to completely dissolve solids, and introducing nitrogen into the solution for 30min to remove oxygen in the solution to obtain the ferric ion solution.

Under the protection of nitrogen atmosphere, putting the iron ion solution into the graphene oxide solution, keeping stirring in the adding process, wherein the stirring speed is 500rpm, and the volume ratio of the iron ion solution: the graphene oxide solution was 1: 2.5. After the addition is finished, the temperature is raised to 60 ℃, and the stirring is continued for 30min, so that ferrous ions and ferric ions are fully adsorbed by oxidized graphene, and a mixed solution is obtained.

S2, depositing, namely slowly dropwise adding ammonia water into the mixed solution obtained in the step S1 until the pH value of the system reaches 10.5, preserving heat at the temperature of 70 ℃ for deposition for 2 hours, keeping stirring, and obtaining a deposition solution at the stirring speed of 200 rpm.

S3, reducing, namely cooling the deposition liquid obtained in the step S2 to 50 ℃, adding a reducing agent, wherein the reducing agent is ascorbic acid, the addition amount of the ascorbic acid is 15 times of the mass of the graphene oxide, and after the addition is finished, carrying out heat preservation reaction for 5 hours. And after the reaction is finished, separating the supernatant and the lower precipitate by using a magnet, taking out the lower precipitate, washing and drying to obtain the magnetic graphene.

Preparation example 2

The preparation example 2 is different from the preparation example 1 in the specific process of the step S2, and specifically includes the following steps:

s21, primary sedimentation, namely slowly dropwise adding ammonia water into the mixed solution obtained in the step S1 until the pH value of the system is 9, carrying out heat preservation sedimentation for 1h at the temperature of 70 ℃, keeping stirring at the stirring speed of 200rpm, and thus obtaining primary sedimentation solution.

S22, secondary deposition, ammonia water is continuously dripped into the primary deposition liquid obtained in the step S21 until the pH value of the system is 10.5, and the deposition liquid is obtained after heat preservation and stirring for 1 hour.

Preparation example 3

Preparation example 3 differs from preparation example 2 in that in step S21, aqueous ammonia was added dropwise until the pH of the system was 9.5; in step S22, aqueous ammonia was added dropwise until the pH of the system became 11.

Preparation example 4

Preparation example 4 differs from preparation example 2 in that in step S21, aqueous ammonia was added dropwise until the pH of the system was 9.5; in step S22, aqueous ammonia is added dropwise until the pH of the system becomes 10.

Preparation example 5

The preparation example 5 is different from the preparation example 2 in the specific process of the step S2, and specifically includes the following steps:

S23, depositing for the third time, namely adding small molecular organic acid salt into the secondary deposition liquid obtained in the step S22, wherein the small molecular organic acid salt is a mixture of sodium humate and ammonium citrate, and the adding amount of the small molecular organic acid salt is (ferrous chloride tetrahydrate and ferric chloride hexahydrate): (sodium humate + ammonium citrate) ═ 20:1, and in molar ratios, sodium humate: ammonium citrate 1: 1.

After the small molecular organic acid salt is added, adjusting the pH value of the system to 4 by using 0.1mol/L hydrochloric acid, and stirring while keeping the temperature to obtain a deposition solution.

Preparation example 6

Preparation example 6 differs from preparation example 5 in that, in step S23, the pH of the system was adjusted to 5 with 0.1mol/L hydrochloric acid.

Examples

The embodiment of the application discloses intelligent atomization glass with low driving voltage, and the structure of the dimming glass is the same in each embodiment, so the structure of the dimming glass is described by taking embodiment 1 as an example.

Example 1

The intelligent atomization glass with the low driving voltage comprises a first transparent layer, an atomization layer and a second transparent layer which are sequentially arranged, wherein ITO glass is selected for use as the first transparent layer and the second transparent layer, and the conductive surfaces of the two pieces of ITO glass are located on the side wall close to one side.

The preparation method of the atomized layer comprises the following raw materials in parts by mass:

wherein, the photo-cured polymer is formed by mixing lauryl methacrylate and polyester acrylic resin, and the dosage of the lauryl methacrylate is 160g (namely 40 wt%), and the dosage of the polyester acrylic resin is 240g (namely 60 wt%).

Wherein, the liquid crystal is E7 liquid crystal.

Wherein the magnetic graphene prepared in preparation example 1 is selected as the magnetic graphene.

Wherein the surfactant is lecithin.

Wherein, the photoinitiator is TPO photoinitiator.

The preparation process of the dimming glass comprises the following process steps:

step one, dispersing magnetic graphene, weighing the magnetic graphene prepared in the preparation example 1 according to a ratio, and placing the magnetic graphene into ethanol for ultrasonic dispersion with ultrasonic power of 100W for 30min to obtain a dispersion liquid of the magnetic graphene.

Step two, preparing a membrane layer, namely uniformly mixing the photo-curing polymer, the liquid crystal, the surfactant and the photoinitiator according to the proportion, then adding the dispersion liquid obtained in the step one to carry out ultrasonic dispersion with the ultrasonic power of 200W for 30min, and obtaining the membrane liquid after the dispersion is finished.

And step three, assembling, namely coating the film liquid obtained in the step two on a first transparent layer, drying the first transparent layer at the temperature of 40 ℃ to constant weight, covering a second transparent layer on the first transparent layer after drying, and filling with a 20-micron electricity isolating substance to ensure that the thickness of the atomized layer is 20 microns to obtain semi-finished glass.

Step four, curing, namely curing the semi-finished glass obtained in the step three under ultraviolet light with the power of 6mW/cm²And the wavelength of the ultraviolet light is 365nm, the curing time is 120s, and the dimming glass is obtained after the curing is finished.

Examples 2 to 4

Examples 2 to 4 differ from example 1 in the ratios of the individual components used for producing the matte layer and are given in the following table, where the units for the individual components are g:

examples 5 to 7

Examples 5 to 7 are different from example 1 in that ammonium zirconium carbonate is additionally added to the photocurable polymer, and the composition ratio of the photocurable polymer in each example is shown in the following table, wherein each component unit in the following table is g:

example 8

Example 8 is different from example 7 in that the magnetic graphene prepared in preparation example 2 is used as the magnetic graphene.

Example 9

Example 9 is different from example 7 in that the magnetic graphene prepared in preparation example 3 is used as the magnetic graphene.

Example 10

Example 10 is different from example 7 in that the magnetic graphene prepared in preparation example 4 is used as the magnetic graphene.

Example 11

Example 11 is different from example 7 in that the magnetic graphene prepared in preparation example 5 is used as the magnetic graphene.

Example 12

Example 12 is different from example 7 in that the magnetic graphene prepared in preparation example 6 is used as the magnetic graphene.

Comparative example

Comparative example 1

The difference between the comparative example 1 and the example 1 is that the magnetic graphene is replaced by nano ferroferric oxide with equal mass.

The preparation process of the nano ferroferric oxide comprises the following process steps:

Slowly dropwise adding ammonia water into the iron ion solution until the pH value of the system reaches 10.5, carrying out heat preservation and precipitation for 2h at the temperature of 70 ℃, and keeping stirring at the stirring speed of 200 rpm. After the reaction is finished, separating the supernatant and the lower precipitate by using a magnet, taking out the lower precipitate, washing and drying to obtain the nano ferroferric oxide.

Comparative example 2

The difference between the comparative example 2 and the comparative example 1 is that the addition amount of the nano ferroferric oxide is 6 g.

Comparative example 3

Comparative example 3 is a blank control, i.e., comparative example 3 differs from example 1 in that no magnetic graphene is added.

Performance detection

1. Driving voltage

Light source and photo resistance are placed respectively in dimming glass both sides, and wherein, light source distance dimming glass 150mm, photo resistance distance dimming glass 5mm, after opening the light source, read photo resistance's data, the numerical value of photo resistance feedback can reflect dimming glass's degree of discolouing.

And connecting two ends of the prepared dimming glass with two stages of transformers to gradually increase the voltage of the transformers. And recording the voltage when the color change degree of the dimming glass reaches 95% of the maximum color change degree, namely the driving voltage.

2. Visible light transmittance and contrast

The visual light transmittance of the dimming glass before and after color change is tested by using a TH-100 haze meter of Hangzhou colorspectrum science and technology Limited company, and the maximum difference value of the two changes is the contrast.

The test results are shown in the following table:

conclusion

As can be seen from the data of comparative example 1 and comparative example 1, in the case of the same addition amount, compared with nano ferroferric oxide, the maximum transmittance of the light control glass is significantly reduced by the magnetic graphene, the driving voltage is more greatly influenced, and the light control glass with more excellent optical performance and lower driving voltage can be obtained.

As can be seen from comparing the data of example 2 and example 3, increasing the content of the liquid crystal can improve the maximum visible light transmittance of the light control glass, and the driving voltage is low even though less magnetic graphene is added. This is probably because, after the liquid crystal content is increased, the volume of the liquid crystal droplets becomes larger and the resistance at the time of rotation is reduced; and the liquid crystal has high transparency and high visible light transmittance. However, the cost of the liquid crystal is high, and the scheme of the embodiment 2 is better by combining the driving voltage, the transmittance and the cost.

It can be seen from the data of comparative example 1, example 5 and example 7 that the additional addition of ammonium zirconium carbonate has less influence on the optical properties of the light control glass, but the whitening phenomenon of the system is greatly reduced in the production process.

By comparing the data of example 7 and example 8, it can be obtained that the performance of the magnetic graphene prepared by the two-step deposition method is significantly better than that of the magnetic graphene prepared by the one-step deposition method, which may be because the two-step deposition method reduces the probability of agglomeration of nano ferroferric oxide and blockage of graphene oxide voids.

The data of comparative example 7 and example 11 show that the performance of the magnetic graphene prepared by the three-step deposition method is remarkably improved. This is probably because, on one hand, the three-step deposition method makes the free nano ferroferric oxide more easily loaded on the graphene oxide; on the other hand, ammonium citrate and ammonium zirconium carbonate, which is a water repellent agent, have a polymerization inhibiting effect, so that the volume of the finally obtained liquid crystal droplets becomes large.

Compared with comparative examples 1 to 3, it can be obtained that the driving voltage of the light-adjusting glass can be adjusted by independently adding the nano ferroferric oxide, but the transmittance of the light-adjusting glass is also greatly influenced by the nano ferroferric oxide, so that the driving voltage of the light-adjusting glass is reduced along with the increase of the adding amount of the nano ferroferric oxide, but the maximum transmittance is also reduced. In addition, the addition of the nano ferroferric oxide can influence the matching degree of the liquid crystal and the photocuring polymer, thereby influencing the minimum transmittance of the dimming glass.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The utility model provides a low drive voltage's intelligent atomizing glass, includes the first stratum lucidum, atomizing layer, the second stratum lucidum that set gradually, its characterized in that: the atomization layer at least comprises the following raw materials in parts by mass:

2. the intelligent atomization glass with low driving voltage as claimed in claim 1, which is characterized in that: the photo-curing polymer comprises the following components in percentage by mass:

0.5-1% of ammonium zirconium carbonate;

38-42% of lauryl methacrylate;

the balance of polyester acrylic resin.

3. The intelligent atomization glass with low driving voltage as claimed in claim 1, which is characterized in that: the preparation process of the magnetic graphene comprises the following process steps:

4. The intelligent atomization glass with low driving voltage as claimed in claim 3, wherein: in step S1, the molar ratio of ferrous chloride tetrahydrate: the ferric chloride hexahydrate is 3: 4.

5. The intelligent atomization glass with low driving voltage as claimed in claim 3, wherein: in step S3, ascorbic acid is used as the reducing agent.

6. The intelligent atomization glass with low driving voltage as claimed in claim 3, wherein: the step S2 specifically includes the following process steps:

7. The intelligent atomization glass with low driving voltage as claimed in claim 6, wherein: the small molecular organic acid salt is a mixture of sodium humate and ammonium citrate.

8. The intelligent atomization glass with low driving voltage as claimed in claim 6, wherein: in the step S21, ammonia water is dripped until the pH value of the system is 9-9.5; in the step S22, ammonia water is added dropwise until the pH value of the system is 10-11.

9. The intelligent atomization glass with low driving voltage as claimed in claim 1, which is characterized in that: the surfactant is lecithin.

10. A preparation technology of intelligent atomized glass with low driving voltage is characterized in that: the method comprises the following process steps: