KR20130061461A - Manufacturing method of heat resistance nanocomposite transparent film - Google Patents

Abstract

PURPOSE: A method of manufacturing a thermal resistance nano composite transparent film is provided to remarkably improve the characteristics of a thermal resistance by manufacturing a nano composite film by aligning a uniformly dispersed nanoclay to an optimal angle. CONSTITUTION: A thermal resistance nano composite transparent film is manufactured by coating a base film(10) with a composition in which a nanoclay(21) is dispersed. A method of manufacturing the thermal resistance nano composite transparent film comprises the following steps: a first dispersion step aims to manufacture a first dispersing agent by ultrasonic dispersing the nanoclay over a reactant for a dilute; a second dispersion step aims to manufacture a second dispersing agent by ultrasonic dispersing the first dispersing agent over a reactivity binder; a coating step aims to coat the second dispersing agent on the base film; a stretching step aims to extend a coated base film in order to form an angle by the nanoclay about a boundary surface of the base film; and a hardening step aims to harden an extended base film by using at least one of an UV or a heat.

Description

Manufacturing method of heat resistant nanocomposite transparent film {Manufacturing Method of heat resistance nanocomposite transparent film}

The present invention relates to a method for manufacturing a heat resistant nanocomposite transparent film, and in particular, by aligning uniformly dispersed nanoclays at an optimal angle to prepare a transparent nanocomposite film, thereby improving the visible light transmittance of the nanocomposite film In addition, the present invention relates to a method for manufacturing an environmentally friendly heat resistant nanocomposite transparent film that can more effectively improve heat resistance characteristics, maximize energy efficiency, and reduce manufacturing costs with a simplified process.

In order to solve the problem of depletion of fossil fuels and the generation of greenhouse gases, which are the main causes of global warming, we are focusing on the development of renewable energy and alternative energy.

More than 80% of global warming greenhouse gas sources come from energy consumption, and more than 80% of building energy consumption comes from air conditioning and heating. Therefore, in order to reduce greenhouse gases, building parts need to strengthen energy saving and energy efficiency management.

In this way, attention to energy saving and energy efficiency has been concentrated, and in the summer, sunlight is prevented from entering the room while the sunlight is emitted by the sun. In winter, infrared rays emitted from the heating apparatus of the room are leaked to the outside. There is an increasing demand for functional materials that can be prevented.

The concept of heat-absorbing materials was proposed in the 1960s, but full-scale research began around 1998, the first products were launched around 2000, and by 2005 the first generation of products was formed.

These attempts to control heat rays have been developed in a variety of ways, including tinted glass, tinted film, low-e glass (low-emission glass), sputter coated glass and sputter coated film. Although commercially available, there are limitations in terms of performance, reliability, and cost in order to still be widely used.

Tint glass or tint film is a high-performance four-season insulation film made by vacuum evaporation or sputtering of metals and metal alloys such as platinum, titanium and copper on glass or film. There are disadvantages. Therefore, in Europe, a double layer of glass is deposited with a special metal film having high infrared reflectance (usually silver), and an insulated window (Low-E glass) filled with an inert gas such as helium or argon in the middle. ) Was developed and used. However, as low-E glass has a high thermal barrier performance, a large difference in thermal expansion characteristics occurs due to absorption of heat wires introduced from the outside, causing low-E glass, which is continuously stressed, to explode. I have a problem.

 In addition, the metal-coated low-emission glass has been increasing in demand in Austria, Switzerland, the United Kingdom, etc., including Germany, and the use rate of Japan, China, etc. is gradually increasing in Asia. However, in Korea, there is still a lack of awareness of energy management technology, which is the lowest application rate internationally.

The technology of coating thin film metal or metal oxide on film or glass can realize some performance characteristics such as high transmittance and heat shield, but in high humidity areas, corrosion occurs and the film is separated or cracked. , Discoloration, there is a problem that interferes with the mobile phone transmission and reception.

 In addition, inorganic oxides such as ITO (Indium Tin Oxide), ATO (Anti-Montin Oxide), and Tungsten Bronze, which are generally used as heat shielding materials, have high thermal barrier properties, but their application range is limited due to low visible light transmittance. In addition, the vacuum deposition and sputtering process is complicated and sensitive, there is a problem that the process cost and the price of the raw material is expensive.

That is, in the case of the conventional thermal barrier glass and film development technology, the heat resistance characteristics, economical efficiency and durability cannot be satisfied at the same time, and thus, a technology that can solve and commercialize these problems by applying a new concept rather than the conventional method. Development is required.

The present invention is to solve the above problems, the present invention is to orient the uniformly dispersed nanoclay at the optimum angle to produce a nanocomposite film, thereby improving the visible light transmittance, more effectively improve the heat resistance characteristics energy It aims to maximize efficiency.

In addition, the conventional metal thin film coating film and glass is low in durability due to problems such as corrosion, and low-E glass (Low-E glass) has a risk of explosion, the stability is low. As such, unlike the unstable, low durability required continuous maintenance and replacement, the present invention is significantly improved durability, long-term use and very stable, heat resistance nanocomposites that can be applied directly to the window of the building, as well as the vehicle window It aims at manufacturing a transparent film.

In addition, it does not go through a complicated and expensive process such as a conventional vacuum deposition or sputtering process, the process step is simplified, manufacturing cost is reduced, and can be applied to a large area to produce heat-resistant nanocomposite transparent film with improved economic efficiency For the purpose of

In addition, by adjusting the orientation angle of the nanoclay having a thermal barrier function, the visible light transmittance is increased while the heat ray blocking rate, heat permeation rate, and UV blocking rate are dramatically improved, thereby significantly improving energy efficiency and effectively saving energy in vehicles and buildings. And it aims to manufacture environmentally friendly heat-resistance nanocomposite transparent film.

In the method of manufacturing a heat resistant nanocomposite transparent film according to the present invention for achieving the above object, in the method of manufacturing a heat resistant nanocomposite transparent film produced by applying a composition in which the nanoclay is dispersed to the base film, A first dispersion step of producing a first dispersion composition by ultrasonic dispersion of the nanoclay in the reaction mixture for dilution; A second dispersion step of preparing a second dispersion composition by ultrasonic dispersion of the first dispersion composition in a reactive binder; A coating step of coating the second dispersion composition on the base film; An extension step of stretching the coated base film such that the nanoclay forms an angle with respect to an interface of the base film; And a curing step of curing the stretched base film using at least one of UV or heat. The output of the ultrasonic wave is repeatedly increased or decreased.

In addition, in the first dispersion step, the output of the ultrasonic wave is 5 to 500W, the dispersion time is 1 to 20 minutes, in the second dispersion step, the output of the ultrasonic wave is 80 to 800W, the dispersion time is 5 to 30 It is characterized by being minutes.

The nanoclay is at least one of montmorillonite, saponite, hectorite or bentonite modified with an ammonium salt, the diluent in the first dispersion step is isobornyl acrylate or isobornyl methacrylate In the second dispersion step, the reactive binder is characterized in that the epoxy or urethane acrylate resin.

In addition, the nanoclay is 0.1 to 30 parts by weight based on 100 parts by weight of the reactant for dilution in the first dispersion step, the first dispersion composition is based on 100 parts by weight of the reactive binder in the second dispersion step It is characterized in that 30 to 100 parts by weight.

In the coating step, the thickness of the coated second dispersion composition is characterized in that formed in 10 to 1000㎛.

In the stretching step, the nanoclay is positioned in at least one of a first array oriented at 0 to 30 degrees and a second array oriented at 150 to 180 degrees with the interface of the base film, wherein the first array and the first array are formed. The two arrays are alternately positioned and oriented, and the base film is divided and stretched by section according to the structure of the first array or the second array.

In addition, the stretching step, the coated base film is characterized in that for stretching 10 to 100% under 50 to 100 ℃.

The curing step is characterized in that the thermosetting for 0.5 to 3 minutes under 60 to 100 ℃, the UV lamp used in the UV curing is at least one of mercury lamp, metal halide lamp or gallium lamp, the ultraviolet lamp The output is 50 to 200 W / cm, the irradiation time is characterized in that 1 to 10 minutes.

According to the method of manufacturing a thermally shielded nanocomposite transparent film of the present invention, there is an advantage of significantly improving the heat resistance property by preparing a nanocomposite film by aligning uniformly dispersed nanoclays at an optimum angle.

In addition, the nanoclay is included in the optimum ratio, it is distributed uniformly through the optimized dispersing method helps to improve the heat resistance characteristics.

By aligning the nanoclay to have an optimized angle, there is an advantage that the visible ray transmittance can be increased while the heat ray blocking rate, heat permeability, and UV blocking rate can be remarkably improved.

In addition, unlike the conventional metal thin film coating film and glass due to problems such as corrosion is low durability requires continuous repair and replacement, the durability is significantly improved and can be used for a long time, the conventional Low-E glass It is very stable in contrast to inferior stability such as the risk of explosion. According to such durability improvement, there is an advantage of manufacturing a heat resistant nanocomposite transparent film that can be directly applied to not only a vehicle window but also a window of a building.

In addition, it does not go through a complicated and expensive process such as a conventional vacuum deposition or sputtering process, the process step is simplified, manufacturing cost is reduced, and can be applied to a large area to produce heat-resistant nanocomposite transparent film with improved economic efficiency. There are advantages to it.

In addition, by using a simple and easy coating method, it is possible to increase the adhesion of the nanocomposite coating layer with the base film, reduce the process cost, there is an excellent durability.

In addition, it can not only significantly improve the heat resistance characteristics, economy and durability, but also block infrared rays from the outside through the nanocomposite coating layer, and also effectively block the heat from flowing out to the outside. Significantly, it is possible to reduce energy consumption of vehicles and buildings, thereby producing environmentally friendly heat-resistant nanocomposite transparent films.

1 is a flow chart sequentially showing a manufacturing method of the heat resistance nanocomposite transparent film of the present invention
Figure 2 is a cross-sectional view showing the structure of the heat resistance nanocomposite transparent film of the present invention
3 (a) and 3 (b) is a cross-sectional view showing the stretched nanoclay orientation of the heat resistant nanocomposite transparent film coating layer prepared according to the present invention
Figure 4 is a cross-sectional view showing the stretched nanoclay orientation of the heat resistance nanocomposite transparent film coating layer prepared according to the present invention
5 is a cross-sectional view showing the reflection effect of different infrared rays on the orientation of the nanoclay of the heat resistant nanocomposite transparent film coating layer prepared according to the present invention
Figure 6 is a graph showing the transmittance for each wavelength of the heat resistance nanocomposite transparent film prepared according to the present invention
Figure 7 is a photograph taken of the transmittance of the heat resistant nanocomposite transparent film prepared according to the present invention

Hereinafter, a preferred embodiment of the method for manufacturing a heat resistant nanocomposite transparent film according to the present invention will be described in detail with reference to FIGS. 1 to 7. The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

First, the manufacturing method of the heat resistance nanocomposite transparent film according to the present invention will be described. As shown in FIG. 1, the method of manufacturing a heat resistant nanocomposite transparent film according to the present invention includes a first dispersion step S10, a second dispersion step S20, a coating step S30, a stretching step S40, and the like. It comprises a curing step (S50).

In addition, Figure 2 is a cross-sectional view showing the structure of the heat-resistant nanocomposite transparent film of the present invention, Figures 3 to 4 is a cross-sectional view showing the stretched nanoclay orientation of the heat-resistant nanocomposite transparent film coating layer prepared according to the present invention. .

The first dispersion step (S10) is a step for producing a first dispersion composition by ultrasonically dispersing the nanoclay 21 in the diluent reactant, by uniformly dispersing the nanoclay 21 in the diluent reactant for optimal heat resistance To implement the property.

 In the first dispersion step (S10), the output of the ultrasonic wave is 5 to 500W, the dispersion time is preferably 1 to 20 minutes, more preferably the output of the ultrasonic wave is 200 to 400W, the dispersion time is 10 to 20 minutes It is effective to continue. When the output of the ultrasonic wave is less than 5W, the output is so weak that the nanoclays 21 are not sufficiently dispersed in the diluent reactant and become uneven. When the stain occurs, the transparency of the heat resistant nanocomposite transparent film is reduced. In addition, when the output of the ultrasonic wave is more than 500W, there is a problem that the output is too strong so that the nanoclay 21 is cut too short to give a sufficient heat resistance effect. Similarly, if the dispersion time is less than 1 minute, the time is too short to effectively disperse, and if the dispersion time is more than 20 minutes, the nanoclay 21 is cut off too short to minimize the optimum heat resistance effect. Occurs.

In addition, the output of the ultrasonic wave is characterized in that it is repeatedly increased or decreased. This is to reduce the excessive heat generated during the ultrasonic dispersion, and to more effectively disperse the nanoclay 21.

The nanoclay 21 is montmorillonite, bentonite, hectorite, fluorohectorite, saponite, beidelite, nontronite, nontronite , Stevensite, vermiculite, volkonskoite, magadite, magyatite, kenyalite or at least one of derivatives thereof, and more preferably ammonium salt. It is effective to form at least one of modified montmorillonite, saponite, hectorite, bentonite. This is because the nanoclay 21 modified with an ammonium salt has excellent compatibility with the polymer resin, and thus more effectively disperses the nanoclay 21.

The dilution reactant isobutyl (meth) acrylate, isodecyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, lauryl (meth) acrylate, tetrahydrofurfuryl ( It is preferable that it consists of at least any one of a meta) acrylate, a stearyl (meth) acrylate, and a caprolactone acrylate, More preferably, it is effective to consist of at least any one of isobornyl acrylate or isobornyl methacrylate. . This serves to control the viscosity to enable uniform dispersion without agglomeration of the nanoclay 21, and has the effect of improving the durability by increasing the adhesion and flexibility.

The content of the nanoclay 21 is preferably 0.1 to 30 parts by weight, more preferably 1 to 25 parts by weight, and most preferably 2 to 18 parts by weight based on 100 parts by weight of the diluent reactant. It is effective to include. If the content is less than 2 parts by weight, the content of nanoclay 21 is too small, so that the thermal barrier effect is insignificant. If the content is more than 35 parts by weight, the light blocking rate of visible light is increased due to the excessive content. There is a problem of significantly lowering.

Next, the second dispersion step (S20) is a step of producing a second dispersion composition by ultrasonic dispersion of the first dispersion composition in the reactive binder, by uniformly dispersing the first dispersion composition in the reactive binder for optimal heat resistance characteristics To implement.

In the second dispersion step (S20), the output of the ultrasonic wave is 80 to 800W, the dispersion time lasts 5 to 30 minutes, preferably the output of the ultrasonic wave 400 to 600W, the dispersion time is effective to last 12 to 25 minutes. to be. When the output of the ultrasonic wave is less than 80W, the first dispersion composition is not sufficiently dispersed in the reactive binder, so that it is difficult to uniformly disperse. When the output of the ultrasonic wave is more than 800W, excessive heat is generated to partially cure during dispersion. Occurs. Similarly, when the dispersion time is less than 5 minutes, the dispersion is not effectively distributed, when the dispersion time is more than 30 minutes, excessive heat is generated and partially cured during dispersion, causing a problem of significantly reducing the heat resistance characteristics.

In addition, the output of the ultrasonic wave is characterized in that it is repeatedly increased or decreased. This is to reduce the excessive heat generated during the ultrasonic dispersion, and more effectively to disperse the first dispersion composition in the reactive binder.

It is preferable that the said reactive binder consists of any one of an alkyd acrylate resin, an ester acrylate resin, an epoxy acrylate resin, or a urethane acrylate resin, More preferably, it is effective to consist of a urethane acrylate resin. The urethane-based acrylate resin is a yellowing-free resin to help the transparency of the film, a resin having strength and flexibility at the same time to improve the adhesion to the base film 10, even after curing cracking or peeling with the base film 10 The phenomenon can be reduced to improve the durability of the film, thereby greatly improving the heat resistance characteristics.

The content is preferably 100 to 100 parts by weight of the reactive binder, 30 to 100 parts by weight, more preferably 30 to 80 parts by weight, most preferably 40 to 60 parts by weight. Is effective. When the first dispersion composition is less than 30 parts by weight, the viscosity of the second dispersion composition is too high, so that it is difficult to uniformly disperse. When the first dispersion composition is formed into a film, staining occurs, thereby decreasing transparency of the heat resistant nanocomposite film, and the dispersed nanoclay There is a problem in that the content of (21) is small and the heat resistance effect is insignificant. In addition, even if it exceeds 100 parts by weight, the viscosity of the second dispersion composition is difficult to form a film, and even if the film is formed, there is a problem in that the strength is low because the optimal heat resistance characteristics are insignificant.

Next, the coating step (S30) is a step of coating the second dispersion composition on the base film 10, bar coating, roll coating, knife coating, gravure coating, micro gravure coating, spin coating, spray coating, slot Although it may be coated by any method of die coating, it is most preferable to use a method capable of effectively dispersing and uniformly dispersing the second dispersion composition including the nanoclay 21.

In addition, the thickness of the coated second dispersion composition layer 20 is preferably 10 to 1000㎛, more preferably 100 to 1000㎛, most preferably 300 to 800㎛ is effective. . If the thickness is less than 10 μm, the thickness is too thin to exhibit sufficient heat resistance characteristics. If the thickness is more than 1000 μm, the thickness is too thick to increase the light blocking rate of visible light, thereby significantly reducing the transparency of the heat-resisting nanocomposite transparent film. Problems such as separation of the two-dispersed composition layer 20 from the base film 10 occur, thereby deteriorating the optimum heat resistance characteristics.

Next, the stretching step (S40) is a step of stretching the coated base film 10 so that the nanoclay 21 forms an angle with respect to the interface of the base film 10. This is to significantly improve the heat resistance characteristics by orienting the nanoclay 21 at an optimal angle with respect to the base film 10 interface.

Here, the structure forming the angle means that the nanoclay 21 is not parallel to the interface of the base film 10, that is, as shown in FIG.

As shown in FIGS. 3A and 3B, the nanoclays 21 are oriented in a first array having an angle of 10 to 30 degrees with respect to the interface of the base film 10 or have an angle of 150 to 170 degrees. It is preferred to be oriented in a second array, more preferably to be oriented in a first array having an angle of 10 to 20 degrees or in a second array having an angle of 160 to 170 degrees.

In addition, as shown in FIG. 4, it is most effective that the first array and the second array are alternately positioned and oriented. This can improve the economical efficiency by implementing the heat resistance effect of the multi-layer structure or various particles by the nanoclay 21 alone, without impairing the transparency of the thermal barrier nanocomposite transparent film. For sake.

The angles of the first array and the second array are angles at which particles of each of the nanoclays 21 present in the heat resistance layer 20 form the interface between the heat resistance layer 20 and the base film 10. As shown in Fig. 4, when the first array and the second array are alternately positioned, the angle is the same when viewed from left to right and when viewed from right to left. Accordingly, the first array and the second array may be reversed.

In addition, the difference between the orientation angle of the first array or the second array and the angle where the nanoclay is actually located is preferably 0.1 to 5 degrees, more preferably 0.1 to 1 degrees. Ideally, the angle difference is 0 degrees, but substantially all of the nanoclays 21 particles present in the heat resistance layer 20 are difficult to form at the same angle without error due to various shapes and sizes. By reducing the error range of the alignment angles of the first array or the second array so that the nanoclays 21 are uniformly and uniformly positioned, the heat resistance characteristic can be remarkably improved by maximizing the reflectance of the incident infrared rays. When the angle difference range exceeds 5 degrees, there is a problem that the reflectance of the infrared light is reduced to minimize the improvement of the thermal resistance characteristics.

In addition, the base film coated according to the structure of the first array and the second array is characterized in that the stretching by dividing section. This is because the selective stretching in consideration of the optimal angle is to achieve the heat resistance effect of the multi-layer structure or various particles by the nanoclay 21 alone, to improve the economics, and to implement the optimum heat resistance characteristics.

As shown in FIG. 5, the angle range is for effectively controlling transmittance and reflectance according to various angles at which visible light and infrared light are incident, and heat the nanoclay 21 alone without the use of conventional expensive metals and metal oxides. This is to maximize the resistance effect. In addition, by blocking more light during the day, the overall thermal barrier effect of the heat-resisting nanocomposite transparent film is higher, and in the morning or evening, the light can be transmitted more than the day, thereby maximizing the energy efficiency inside. . If it is out of the angular range, the transmittance and reflectance of visible light and infrared rays are remarkably lowered, and thus there is a problem that the thermal barrier effect is substantially reduced.

It is preferable that the stretching step is performed under 50 to 100 ° C, more preferably under 60 to 90 ° C, and most preferably under 70 to 80 ° C, which is effective for nanoclay angular orientation. This may improve the thermal resistance characteristics by helping the nanoclay 21 to uniformly align the fluidity of the second dispersion composition at the above temperature.

When the temperature is less than 50 ° C., the flowability of the coated second dispersion composition 20 is not so low that the nanoclays 21 are not oriented at a desired angle, and when the temperature is higher than 100 ° C., the nano clay 21 may be partially cured during stretching to obtain a uniform angle. It is difficult to be oriented, and a problem occurs that the cured second dispersion composition layer 20 is peeled off the base film 10.

In addition, the stretching step is preferably 10 to 100% stretching, more preferably 20 to 80% stretching is effective. When the elongation (%) is less than 10%, since the orientation angle of the nanoclay 21 cannot be adjusted, the heat resistance property is significantly reduced, and when the elongation (%) is more than 100%, the dispersed nanoclays (21) As the spacing of) increases too far, and the nanoclay 21 particles are located on the same cross section, a problem arises in that the heat resistance characteristic is reduced. Therefore, various elongations (%) can be applied within a preferred range depending on the angle of the nanoclay 21 to be oriented.

Next, the curing step (S50) is a step of curing the stretched base film using at least one of UV or heat, it is preferable to proceed for 0.5 to 3 minutes under 60 to 100 ℃ in the case of thermal curing, more preferably It is effective to proceed for 1 to 2 minutes under 70 to 90 ℃. When cured at 60 ° C and less than 0.5 minutes, only partially cured and significantly lowered the heat resistance characteristics.When cured at 100 ° C and more than 3 minutes, yellowing occurred, resulting in a decrease in transparency of the heat resistant transparent film. While the rapid shrinkage of the adhesive force with the base film 10 is reduced, the second dispersion composition layer 20 is peeled off from the base film 10 causes a problem that the durability is poor.

In the case of UV curing, mercury lamp, metal halide lamp or gallium lamp may be used for the UV lamp used, and it is preferable to use a high-pressure mercury lamp which preferably uses 365 nm as the main wavelength. In addition, the ultraviolet output is 50 to 200 W / cm, the irradiation time is preferably 1 to 10 minutes. More preferably, ultraviolet output is 100-150 W / cm, and irradiation time is effective for 1-3 minutes. When the UV output is less than 50W / cm and the irradiation time is less than 1 minute, it is only partially cured and the thermal resistance is significantly lowered. When curing is more than 200W / cm and more than 10 minutes, yellowing occurs, which causes Transparency decreases, rapid contraction of the coating layer occurs, and the adhesion force with the base film 10 decreases, so that the second dispersion composition layer 20 is peeled off, resulting in a decrease in durability.

Hereinafter, in order to achieve the above object of the present invention will be described in detail the embodiment is formed in accordance with the manufacturing method of the heat resistant nanocomposite transparent film significantly improved heat resistance characteristics.

Example  One

It was prepared according to the manufacturing method of the heat-resisting nanocomposite transparent film of the present invention, 50% stretched up and down at 80 ℃ in the stretching step

Example  2

The transparent film which was prepared according to the method of manufacturing a heat resistant nanocomposite transparent film of the present invention and stretched up and down 65% at 80 ° C. in the stretching step

Example  3

It was prepared according to the method of manufacturing a heat resistant nanocomposite transparent film of the present invention, and 50% stretched film at 15 ° and 165 ° angles at 80 ° C. for each section in the drawing step.

Comparative example  One

3M thermal resistance film on the market

Comparative example  2

Commercially available thermal resistance film from Japan Crystal Bond Co., Ltd.

Comparative example  3

Films used as base films in Examples 1,2,3

Table 1 below shows the thermal barrier properties of the heat resistant nanocomposite transparent film (Examples 1, 2, 3) prepared according to the manufacturing method of the present invention and the thermal barrier film (Comparative Examples 1, 2, 3) conventionally used. That is, the heat transfer rate, ii) heat ray blocking rate, iv) visible light transmittance, and iv) UV blocking rate were compared.

The overall thermal barrier performance has a UV blocking rate of 10%, and the remaining three items all have about 30%.

Here, the heat permeability was measured according to the KS L2525 test standard, the heat ray shielding rate to the JIS K7350 test standard, the visible light transmittance to the JIS K7105 test standard, and the UV cutoff rate to the JIS K 7105 test standard. In addition, heat permeability was calculated by the following formula.

Thermal permeability = (1 / thermal resistance) = (thermal conductivity / thickness)

Thermal Conductivity = (Thickness / Thermal Resistance)

Thermal Resistance = (Indoor Surface Heat Transfer Resistance + Material Thickness / Thermal Conductivity of Material)

Heat transmission rate
(U-value)
(Kcal / m ² hr ℃) Heat shielding rate
(IR cut.)
(%) Visible light transmittance
(VLT)
(%) UV blocking rate
(UV cut.)
(%) Example  One 4.3 89 89 99 Example  2 4.4 90 90 99 Example  3 3.9 92 92 99 Comparative Example 1 5.6 65 80 99 Comparative Example 2 5.0 80 60 98 Comparative Example 3 5.8 50 96 80

As shown in the experimental results of Table 1, Examples 1, 2, and 3 corresponding to the present invention have a heat permeability and a heat shielding rate of about 20% and 35%, respectively, compared to the conventional Comparative Examples 1, 2 and 3, respectively. In addition, the visible light transmittance and UV blocking rate were improved by about 10% and about 7%, respectively.

FIG. 6 is a graph showing transmittances of wavelength bands in a visible light region according to Examples 1, 2 and 3; FIG. At 400 nm, the lowest transmittance is shown at about 89% in Example 1 and the highest transmittance is shown at about 92% in Example 3. The difference between the highest and the lowest is about 5%, and the lowest transmittance is much better than that of Comparative Examples 1 and 2, so that the heat resistance characteristics are excellent in Examples 1, 2 and 3 without decreasing the transmittance in the visible light region. It can be seen.

7 is a photograph photographing the transmittances of Examples 1, 2 and 3 in comparison. When Examples 1, 2 and 3 are made of a film, the transparency is similar to the naked eye so that it can be seen that the heat resistance is excellent without a decrease in transmittance in the visible region.

Therefore, the heat resistance characteristics of the heat resistant nanocomposite transparent films prepared according to the present invention (Examples 1, 2 and 3) were all superior to the conventional Comparative Examples 1, 2 and 3, respectively.

In particular, Example 3 of the present invention shows improved heat resistance characteristics compared to Examples 1 and 2, the orientation angle of the nanoclay 21 according to the stretching conditions of the present invention contributes to the improvement of the heat resistance characteristics It can be seen.

As described above, as shown in the above experimental results, the heat resistance nanocomposite transparent film of the present invention has improved economical efficiency, reduced durability, and stable heat resistance characteristics due to a simplified process and lower raw material costs, compared to the prior art. It is improved and can be applied to various fields such as buildings as well as automobiles as a breakthrough energy saving material using a new concept in the technical field.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

10: base film
20: second dispersion composition layer
21: nanoclay

Claims (13)

In the method of manufacturing a heat resistant nanocomposite transparent film prepared by applying a composition in which the nanoclay is dispersed on a base film,
A first dispersion step of dispersing the nanoclay in a reactant for dilution to produce a first dispersion composition;
A second dispersion step of preparing a second dispersion composition by ultrasonic dispersion of the first dispersion composition in a reactive binder;
A coating step of coating the second dispersion composition on the base film;
An extension step of stretching the coated base film such that the nanoclay forms an angle with respect to an interface of the base film; And
And a curing step of curing the stretched base film using at least one of UV and heat, wherein the output of the ultrasonic waves in the first and second dispersion steps is repeatedly increased or decreased. Method of manufacturing a nanocomposite transparent film.
The method of claim 1,
In the first dispersion step, the output of the ultrasonic wave is 5 to 500W, the dispersion time is 1 minute to 20 minutes, and in the second dispersion step, the output of the ultrasonic wave is 80 to 800W, the dispersion time is 5 minutes to 30 minutes. Method for producing a heat resistant nanocomposite transparent film, characterized in that the powder.
The method of claim 1,
The nanoclay is a method for producing a heat resistant nanocomposite transparent film, characterized in that at least one of montmorillonite, saponite, hectorite or bentonite modified with an ammonium salt.
The method of claim 1,
The diluent in the first dispersion step is isobornyl acrylate or isobornyl methacrylate, and in the second dispersion step, the reactive binder is a heat resistance nano, characterized in that the epoxy or urethane acrylate resin Method for producing a composite transparent film.
The method of claim 1,
The nanoclay is 0.1 to 30 parts by weight based on 100 parts by weight of the reactant for dilution in the first dispersion step, and the first dispersion composition is 30 to 30 parts by weight based on 100 parts by weight of the reactive binder in the second dispersion step. Method for producing a heat resistant nanocomposite transparent film, characterized in that 100 parts by weight.
The method of claim 1,
In the coating step, the thickness of the coated second dispersion composition is a manufacturing method of the heat resistant nanocomposite transparent film, characterized in that formed in 10㎛ to 1000㎛.
The method of claim 1,
The stretching step, the heat resistance nanocomposite is characterized in that the nanoclay is located in the form of at least one of the first array or the second array is oriented from 150 to 180 degrees and 0 to 30 degrees with respect to the interface of the base film Method for producing a transparent film.
8. The method of claim 7,
In the stretching step, the first array and the second array is a method of manufacturing a heat resistant nanocomposite transparent film, characterized in that the alternating position.
8. The method of claim 7,
The stretching step, the method of producing a heat-resisting nanocomposite transparent film, characterized in that for stretching the base film by section according to the structure of the first array or the second array.
The method of claim 1,
The stretching step, the method of producing a heat resistant nanocomposite transparent film, characterized in that for stretching the coated base film under 50 ℃ to 100 ℃, 10 to 100%.
The method of claim 1,
The curing step is a method for producing a heat resistant nanocomposite transparent film, characterized in that the thermal curing for 0.5 to 3 minutes at 60 to 100 ℃.
The method of claim 1,
The curing step, the UV lamp used during the UV curing is at least one of mercury lamp, metal halide lamp or gallium lamp, the output of the ultraviolet light is 50 to 200W / cm, the irradiation time is 1 to 10 minutes Method for producing a heat resistant nanocomposite transparent film made of.
A heat resistant nanocomposite transparent film prepared by the method for producing a heat resistant nanocomposite transparent film of claim 1.

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