CN112625577A - Preparation process and application of ultrahigh-transmittance blue-light-free and white-fog-free nano heat-insulating coating - Google Patents
Preparation process and application of ultrahigh-transmittance blue-light-free and white-fog-free nano heat-insulating coating Download PDFInfo
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- CN112625577A CN112625577A CN202011535199.XA CN202011535199A CN112625577A CN 112625577 A CN112625577 A CN 112625577A CN 202011535199 A CN202011535199 A CN 202011535199A CN 112625577 A CN112625577 A CN 112625577A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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Abstract
The invention discloses a preparation process and application of an ultrahigh-transmittance blue-light-free white-fog-free nano heat-insulating coating, wherein the preparation process comprises the following steps: step one, preparing nano heat insulation slurry; step two, mixing the nano heat insulation slurry prepared in the step one and a solvent b into a nano heat insulation slurry mixed solution by adopting a stirrer for later use; step three, preparing the composite adhesive; and step four, uniformly mixing the nano heat insulation slurry mixed solution prepared in the step two with the composite adhesive prepared in the step three to prepare the nano heat insulation coating. The invention uses dispersant, grinding and ultrasonic program and adjusts the pH value of the reaction solution in a proper interval, thus preparing the nano heat insulation slurry with stable performance. The heat-insulating window film provided by the invention has the advantages that the nano heat-insulating slurry with stable service performance can not generate blue light white fog, the heat-insulating effect is obvious and durable, the heat-insulating window film is not oxidized, faded and blocked by GPS (global positioning system), and the heat-insulating window film has high heat insulation, high light transmission, low light reflection, durable color and luster and long service life.
Description
Technical Field
The invention relates to the field of window films, in particular to a preparation process and application of an ultrahigh-transmittance blue-light-free and white-fog-free nano heat-insulating coating.
Background
With the increasing importance of the country on the policy of environmental protection, energy conservation and emission reduction, in order to respond to the national call, the window film industry also increases the technical research and development, and the research on the novel environmental protection, heat insulation and energy conservation products is promoted. At present, with the development of the window film industry, a novel tungstate nano material also enters the application of energy-saving heat-insulating coating products, however, because the nano particles have small particle size, large surface atomic proportion, large specific surface and large surface energy, the nano particles are in an unstable energy state and are easy to agglomerate to cause particle enlargement. Due to the instability of the nano material, when the prepared nano material window film passes through a strong light source (especially a blue headlight such as an LED with the color temperature of 5000K-10000K, HID (xenon), and the like), a Rayleigh scattering phenomenon occurs, and a short-waveband blue light scattering phenomenon caused by the Rayleigh scattering phenomenon causes a blue light fogging phenomenon on the film surface. This phenomenon is particularly noticeable when the lamp is suddenly exposed to intense light in a dark environment. Therefore, the lamp light shines when the vehicle meets the vehicle during driving at night, and the driver can not see the road condition ahead clearly due to the defect, so that the potential safety hazard is greatly avoided.
Cesium tungstate is a new heat-insulating material discovered in recent years, and transparent heat-insulating coatings of the Cesium tungstate are developed vigorously by some famous coating companies such as Japan, Germany, America and the like. The nano cesium tungstate powder is inorganic nano powder with optimal absorption capacity for near infrared, has extremely strong absorption characteristic in a near infrared region (the wavelength is 800-1100 nm), has strong transmission characteristic in a visible light region (the wavelength is 380-780 nm), and also has strong shielding characteristic in an ultraviolet light region (the wavelength is 200-380 nm).
Disclosure of Invention
The invention aims to provide a preparation process and application of an ultrahigh-transmittance blue-light-free and white-fog-free nano heat-insulating coating, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of the ultrahigh-transmittance blue-light-free white-fog-free nano heat-insulating coating comprises the following steps:
step one, preparing nano heat insulation slurry, mixing cesium tungstate slurry and a solvent a to form a dispersed suspension; executing an ultrasonic program, adding a dispersing agent, and continuing to execute the ultrasonic program; then executing a low-speed centrifugal separation program; adjusting the pH value of the dispersed suspension to 7.5-8.0 to prepare nano heat-insulating slurry, wherein the solvent a is toluene, and the dispersing agent is sodium polyacrylate;
step two, mixing the nano heat insulation slurry prepared in the step one and a solvent b into a nano heat insulation slurry mixed solution by adopting a stirrer for later use;
step three, preparing the composite glue, namely mixing the glue and a solvent c according to the ratio of 1:1, uniformly mixing;
step four, uniformly mixing the mixed solution of the nano heat insulation slurry prepared in the step two with the composite glue prepared in the step three, wherein the weight percentage of the composite glue is 10-15%, then adding a curing agent, wherein the weight of the curing agent is 3% of the solid content of the composite glue, and mixing and stirring for 20-30 minutes to prepare the nano heat insulation coating.
Preferably, in the first step, the weight percentage of the cesium tungstate is 10% -20%, the weight percentage of the dispersant is 2% -10%, and the balance is the solvent a.
Preferably, in the first step, the pH of the dispersion suspension is adjusted by adding a pH adjusting agent, and the pH adjusting agent accounts for 2-5% of the weight of the dispersion suspension.
Preferably, the weight ratio of the nano heat insulation slurry to the solvent b in the second step is 2:1, wherein the solvent b is toluene, and the stirrer is stirred for 1-2 hours at the rotating speed of 500 rpm.
Preferably, the glue selected in the third step is polyurethane glue; the solvent c is butanone.
An application of a super-high-transmittance blue-light-free and white-fog-free nano heat-insulating coating on a heat-insulating window film.
The invention has the beneficial effects that:
(1) the invention uses dispersant, grinding and ultrasonic program and adjusts the pH value of the reaction solution in a proper interval, thus preparing the nano heat insulation slurry with stable performance.
(2) The heat-insulating window film provided by the invention has the advantages that the nano heat-insulating slurry with stable service performance can not generate blue light white fog, the heat-insulating effect is obvious and durable, the heat-insulating window film is not oxidized, faded and blocked by GPS (global positioning system), and the heat-insulating window film has high heat insulation, high light transmission, low light reflection, durable color and luster and long service life.
Drawings
FIG. 1 is a flow chart of the process for producing the nano-sized thermal insulation paste of the present invention.
FIG. 2 is a flow chart of the process for preparing the nano heat-insulating coating of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of 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 invention.
Example 1: FIG. 1 is a flow chart of the process for producing the nano-sized insulating slurry according to the present embodiment.
The nano heat insulation slurry comprises the following raw materials in percentage by mass: the weight percentage of the cesium tungstate is 10-20%, the weight percentage of the dispersant is 2-10%, and the balance is the solvent a, and the preparation process of the nano heat insulation slurry comprises the following steps:
s11, mixing the cesium tungstate slurry with a solvent a, wherein the solvent a is toluene;
s12, executing an ultrasonic program, wherein the power of the ultrasonic wave is 90W, the frequency of the ultrasonic wave is 40 kHz, and the ultrasonic time is 60 minutes, wherein the ultrasonic wave is extruded and pulled under the positive and negative pressure generated in the medium, so that the nano particles can be effectively and uniformly dispersed;
s13, mixing the nano slurry dispersing agent, wherein the dispersing agent is sodium polyacrylate, and continuously keeping ultrasonic resonance dispersion for 30 minutes;
s14, executing a centrifugal separation procedure to accelerate the settling rate of larger particles in the dispersed slurry, taking the supernatant to enter the next procedure, and repeatedly executing the ultrasonic dispersion procedure after the bottom layer turbid liquid is recovered.
S15 adjusting the pH of the dispersion to 7.5-8.0.
The stability of the nano thermal insulation slurry prepared in this example was examined by the following experiment.
(1) Sedimentation test:
the nano-insulation slurry prepared in example 1 was poured into a 10 ml graduated test tube, and after standing for 7 days, the height of the upper clear water column was measured, and the higher the height of the clear water column, the more unstable the nano-particles were. The clear water column of the nano heat insulation slurry is at least 20 percent lower than that of the prior art.
(2) Ultraviolet-visible spectrophotometer test:
the nano-insulation slurry prepared in this example was placed on a centrifuge and centrifuged at 3000rpm for 10 minutes. The supernatant was taken and placed in a cuvette, and its light transmittance at a wavelength of 600 nm was measured with a Hitachi U-3010 ultraviolet-visible spectrophotometer. The lower the light transmittance, the better the dispersion stability of the dispersion. The light transmittance of the nano thermal insulation slurry of the embodiment is at least 25% lower than that of the prior art.
The nano heat insulation slurry of the embodiment is detected by a BT-9300H laser particle size analyzer, the particle size of the nano particles is between 20 and 40 nanometers, and the nano particles can be maintained in a stable state for a long time.
Example 2: preparing composite glue, wherein the composite glue is prepared by the following steps:
s21 mixing the glue and the solvent c, in this example, the solvent c used is butanone, and the weight ratio of the glue to the solvent is 1: 1. In the step, the stirrer stirs for 1 hour at the rotating speed of 500rpm to achieve the purpose of uniform mixing, and the glue is polyurethane glue.
Example 3: the nano thermal insulation coating is prepared by adopting the nano thermal insulation slurry of the embodiment 1. The specific preparation flow is shown in fig. 2, and the manufacturing process of the nano heat insulation coating comprises the following steps:
s31, mixing the nano heat insulation slurry prepared in the example 1 with a solvent b, wherein the solvent b is toluene, the weight ratio of the nano heat insulation slurry to the solvent b is 2:1, and in the step, a stirrer is stirred for 1 hour at the rotating speed of 500rpm to achieve the purpose of uniform mixing;
s32, mixing and stirring the solution prepared in the step S31 and compound glue for 10 minutes, wherein the weight percentage of the compound glue is 10-15%;
s33 adding a curing agent into the solution prepared in the step S32, then adding the curing agent, wherein the weight of the curing agent is 3% of the solid content of the composite adhesive, and stirring for 20 minutes.
Example 4: and then the nano heat insulation coating prepared in the embodiment 3 which is uniformly stirred is uniformly coated on the surface of the 23-micron PET base film by a slit coating process. Wherein the thickness of the coating is substantially 8 microns, and a semi-finished product material with heat insulation performance is prepared after precision compounding. After 24 hours and after curing at 60 ℃, the high-transparency acrylic pressure-sensitive adhesive is precisely coated and compounded with a release film. And UV precision coating is carried out on the back surface, and the thickness is about 2 microns substantially through ultraviolet light curing. Thus, the nano heat insulation coating can be prepared into a window film.
The surface hardness of the prepared window film is more than 3H through testing; the visible light transmittance is more than 70 percent; the infrared ray blocking rate is more than 90 percent, haze is less than or equal to 1.3, (QUV 1000hrs test) Delta E is less than or equal to 0.5; and no adverse phenomena such as blue light, white fog and the like exist under the irradiation of an LED light source with the color temperature of 10000K.
As described above, the window film made of the nano heat-insulating coating according to the embodiment has a perfect window film product with a long service life, and the perfect window film product has the advantages of obvious and durable heat-insulating effect, no oxidation, no fading, no GPS obstruction, high heat insulation, high light transmittance, low light reflection, and durable color.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A preparation process of an ultrahigh-transmittance blue-light-free and white-fog-free nanometer heat-insulating coating is characterized by comprising the following steps of: the preparation process comprises the following steps:
step one, preparing nano heat insulation slurry, mixing cesium tungstate slurry and a solvent a to form a dispersed suspension; executing an ultrasonic program, adding a dispersing agent, and continuing to execute the ultrasonic program; then executing a low-speed centrifugal separation program; adjusting the pH value of the dispersed suspension to 7.5-8.0 to prepare nano heat-insulating slurry, wherein the solvent a is toluene, and the dispersing agent is sodium polyacrylate;
step two, mixing the nano heat insulation slurry prepared in the step one and a solvent b into a nano heat insulation slurry mixed solution by adopting a stirrer for later use;
step three, preparing the composite glue, namely mixing the glue and a solvent c according to the ratio of 1:1, uniformly mixing; step four, mixing the nano heat insulation slurry mixed solution prepared in the step two with the composite adhesive prepared in the step three
Mixing uniformly, wherein the weight percentage of the composite adhesive is 10% -15%, then adding a curing agent, wherein the weight of the curing agent is 3% of the solid content of the composite adhesive, mixing and stirring for 20-30 minutes to prepare the nano heat insulation coating.
2. The preparation process of the ultrahigh-transmittance blue-light-free and white-fog-free nanometer thermal insulation coating as claimed in claim 1, is characterized in that: in the first step, the weight percentage of the cesium tungstate is 10-20%, the weight percentage of the dispersant is 2-10%, and the balance is the solvent a.
3. The preparation process of the ultrahigh-transmittance blue-light-free and white-fog-free nanometer thermal insulation coating as claimed in claim 1, is characterized in that: in the first step, the pH value of the dispersed suspension is adjusted by adding a pH value adjusting agent, and the pH value adjusting agent accounts for 2-5% of the weight of the dispersed suspension.
4. The preparation process of the ultrahigh-transmittance blue-light-free and white-fog-free nanometer thermal insulation coating as claimed in claim 1, is characterized in that: in the second step, the weight ratio of the nano heat insulation slurry to the solvent b is 2:1, wherein the used solvent b is toluene, and in the second step, the stirrer is stirred for 1-2 hours at the rotating speed of 500 rpm.
5. The preparation process of the ultrahigh-transmittance blue-light-free and white-fog-free nanometer thermal insulation coating as claimed in claim 1, is characterized in that: the glue selected in the third step is polyurethane glue; the solvent c is butanone.
6. The application of the ultrahigh-transmittance blue-light-free and white-fog-free nanometer thermal insulation coating as claimed in claim 1, which is used for preparing a thermal insulation window film.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106010183A (en) * | 2016-06-24 | 2016-10-12 | 海安浩驰科技有限公司 | Nanometer thermal insulation slurry and coating, preparation technology of slurry and coating and application in thermal insulation window membrane |
| CN106349913A (en) * | 2016-09-29 | 2017-01-25 | 深圳大学 | Cesium tungstate nanometer thermal-insulation sizing agent, coating and preparation method thereof |
| CN106634500A (en) * | 2016-09-19 | 2017-05-10 | 深圳市文浩科技有限公司 | Insulation coating for glass and application method thereof |
| CN109852027A (en) * | 2019-01-02 | 2019-06-07 | 深圳市德厚科技有限公司 | A kind of spectral selection PC thermal insulation board and preparation method thereof |
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- 2020-12-23 CN CN202011535199.XA patent/CN112625577A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106010183A (en) * | 2016-06-24 | 2016-10-12 | 海安浩驰科技有限公司 | Nanometer thermal insulation slurry and coating, preparation technology of slurry and coating and application in thermal insulation window membrane |
| CN106634500A (en) * | 2016-09-19 | 2017-05-10 | 深圳市文浩科技有限公司 | Insulation coating for glass and application method thereof |
| CN106349913A (en) * | 2016-09-29 | 2017-01-25 | 深圳大学 | Cesium tungstate nanometer thermal-insulation sizing agent, coating and preparation method thereof |
| CN109852027A (en) * | 2019-01-02 | 2019-06-07 | 深圳市德厚科技有限公司 | A kind of spectral selection PC thermal insulation board and preparation method thereof |
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Application publication date: 20210409 |