KR101480965B1 - Manufacturing Method of heat resistance nanocomposite transparent film - Google Patents

Abstract

The present invention relates to a method for producing a transparent thermocompression-sensitive nanocomposite film, comprising: a first dispersion step of ultrasonically dispersing a nanoclay in a dilution reaction product to prepare a first dispersion composition; A second dispersion step of ultrasonically dispersing the first dispersion composition in a reactive binder to prepare a second dispersion composition; A coating step of coating the second dispersion composition on a base film; A stretching step of stretching the coated base film so that the nano-clay 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 and heat, The output of the ultrasonic waves in the first dispersion step and the second dispersion step is repeatedly increased or decreased.
According to the present invention, a nanocomposite film including a nanoclay oriented at a certain angle improves visible light transmittance, maximizes energy efficiency by more effectively improving thermal resistance characteristics, and reduces manufacturing costs by a simplified process And durability is improved, it is possible to manufacture an environmentally friendly heat resistant nano composite transparent film applicable to various fields such as vehicles and buildings.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a nanocomposite transparent film,

More particularly, the present invention relates to a method of producing a transparent nanocomposite film by orienting uniformly dispersed nanoclay at an optimal angle, thereby improving the visible light transmittance of the nanocomposite film Resistant thermosensitive nano-composite transparent film which can improve the thermal resistance characteristics more effectively to maximize the energy efficiency and can reduce the manufacturing cost by a simplified process.

We are focusing on the development of renewable energy and alternative energy to solve the problem of greenhouse gas generation which is the main cause of depletion of fossil fuels and global warming all over the world.

More than 80% of the sources of global warming greenhouse gases are generated from energy consumption, and more than 80% of building energy consumption is consumed in the process of operating air conditioning and electrical equipment. Therefore, in order to reduce greenhouse gas emissions, energy conservation and strengthening of energy efficiency management are required.

In this way, as the interest in energy conservation and energy efficiency is concentrated, it secures mining by sunlight in the summer and prevents the outdoor solar radiation from entering the room in the summer. In winter, There is a growing demand for functional materials that can prevent the occurrence of such problems.

The concept of heat absorbing materials was proposed in the 1960s, but full-scale research began in 1998, and the first product was released in 2000, and the first generation product group was formed in 2005.

Attempts to control these hot wires have been developed in a variety of ways, including tinted glass, tinted films, low-E glass, sputter-coated glass, and sputter-coated films, Although it has been commercialized, there are limitations in performance, reliability and unit cost in order to be widely spread.

The tinted glass or tint film is a high-performance four seasons heat insulating film produced by vacuum depositing or sputtering a metal or a metal alloy such as platinum, titanium, and copper on a glass or a film. The tinted glass or tint film is excellent in heat shielding property but weak in oxidation and discoloration, There are disadvantages. In Europe, a double-layered glass with a special metal film (usually silver) with a high infrared reflectance is deposited, and an insulating window (low-emission glass, Low-E glass ) Were developed and used. However, the low-E glass has a high thermal performance, so that the difference in thermal expansion characteristics is largely caused by the absorption of the heat ray flowing from the outside, and the low-E glass which is continuously stressed explodes I have a problem.

 In addition, demand for low-emission glass in the form of metal coating has increased in Germany, Austria, Switzerland, and the United Kingdom. In Asia, the use ratio of Japan and China is gradually increasing. In Korea, however, there is still insufficient awareness of energy management technology, which shows the lowest international application rate.

The technique of applying a thin film metal or a metal oxide to a film or a glass can realize some performance characteristics such as a high transmittance and a heat shielding property but it is possible that a film is separated or cracked due to corrosion in a high humidity region , There is a problem of discoloration and interference with the transmission / reception of the mobile phone.

 Inorganic oxides such as ITO (indium tin oxide), ATO (antimony tin oxide), and tungsten bronze, which are generally used as a thermal barrier material, have high thermal barrier properties, but their application range is limited due to low visible light transmittance There is a problem that the vacuum deposition and sputtering processes are complicated and sensitive and the cost of the process and the cost of the raw material are high.

In other words, in the case of the conventional technique of developing a short glass and film of a heat ray, it is impossible to simultaneously satisfy the heat resistance characteristic, the economical efficiency and the durability. Therefore, the technology which can solve these problems and commercialize them remarkably by applying a new concept, Development is required.

Disclosure of the Invention The present invention has been made to solve the above problems, and it is an object of the present invention to provide a nanocomposite film by orienting uniformly dispersed nanoclay at an optimal angle, thereby improving visible light transmittance, Thereby maximizing the efficiency.

In addition, the conventional metal thin film coating film and glass have low durability due to corrosion and the like, and the low-E glass has a risk of explosion and is not stable. As described above, since the durability is low and the maintenance and replacement is necessary and unstable, the present invention is remarkably improved in durability so that it can be used for a long time and is very stable. Therefore, the present invention can be applied not only to vehicle windows, To thereby produce a transparent film.

In addition, a thermally resistant nanocomposite transparent film having a simple process step, a reduced manufacturing cost, and a large area can be manufactured without complicated and expensive processes such as a conventional vacuum vapor deposition or sputtering process, .

By controlling the orientation angle of the nanoclays with heat shielding function, the transmittance of the visible light is increased, while the heat blocking rate, the heat conduction rate and the UV blocking rate are drastically improved, thereby remarkably improving the energy efficiency and effectively saving energy in vehicles and buildings And to produce an environmentally friendly heat resistant nanocomposite transparent film.

According to another aspect of the present invention, there is provided a method of manufacturing a thermally resistant nanocomposite transparent film, comprising: applying a nanoclay-dispersed composition to a base film, A first dispersion step of ultrasonically dispersing the nanoclay in a dilution reaction material to produce a first dispersion composition; A second dispersion step of ultrasonically dispersing the first dispersion composition in a reactive binder to produce a second dispersion composition; A coating step of coating the second dispersion composition on the base film; A stretching step of stretching the coated base film so that the nano-clay forms an angle with respect to an interface of the base film; And a curing step of curing the stretched base film by using at least one of UV and heat, and the output of the ultrasonic wave is repeatedly increased or decreased.

Also, in the first dispersion step, the output of the ultrasonic waves is 5 to 500 W, the dispersion time is 1 to 20 minutes, the output of the ultrasonic waves in the second dispersion step is 80 to 800 W, and the dispersion time is 5 to 30 Min.

Wherein the nanoclay is at least one of montmorillonite, saponite, hectorite or bentonite modified with an ammonium salt. In the first dispersion step, the diluting reactant is isobornyl acrylate or isobornyl methacrylate , And the reactive binder in the second dispersion step is an epoxy-based or urethane-based acrylate resin.

In addition, in the first dispersion step, the nanoclay is 0.1 to 30 parts by weight based on 100 parts by weight of the diluting reactant, and in the second dispersion step, the first dispersion composition is mixed with 100 parts by weight of the reactive binder, 30 to 100 parts by weight.

In the coating step, the coated second dispersion composition has a thickness of 10 to 1000 mu m.

Wherein the stretching step is located in a form of at least one of a first arrangement in which the nano-clay is oriented 0 to 30 degrees with the interface of the base film or a second arrangement in which the nanoclay is oriented 150 to 180 degrees, The two arrangements are alternately positioned and oriented, and the base film is stretched according to the structure of the first arrangement or the second arrangement by dividing the segments into sections.

Further, the stretching step is characterized in that the coated base film is stretched by 10 to 100% at 50 to 100 캜.

The curing step is characterized by thermally curing at 60 to 100 ° C for 0.5 to 3 minutes. The ultraviolet ray to be used in UV curing is at least one of mercury lamp, metal halide, gallium and the like, Is in the range of 50 to 200 W / cm, and the irradiation time is 1 to 10 minutes.

According to the method for producing a transparent heat-and-nanocomposite transparent film of the present invention, uniformly dispersed nano-clay is oriented at an optimal angle to produce a nanocomposite film, thereby remarkably improving thermal resistance characteristics.

In addition, nanoclays are included at an optimum rate and are uniformly dispersed through an optimized dispersion method to help improve thermal resistance characteristics.

By orienting the nanoclay to have an optimized angle, the transmittance of the visible light can be increased, but the heat ray blocking rate, the heat conduction rate and the UV blocking rate can be dramatically improved.

Unlike the conventional metal thin film coated film and glass which are low in durability due to corrosion and the like, it is possible to use for a long time by improving the durability remarkably and being able to use the low-E glass It is very stable compared with poor stability such as explosion risk. With such improved durability, there is an advantage that a heat resistant nanocomposite transparent film which can be applied not only to a vehicle window but also to a window of a building can be produced.

Further, it is possible to manufacture a heat-resistant nanocomposite transparent film which is not subjected to a complicated and expensive process such as a conventional vacuum vapor deposition or sputtering process, the process steps are simplified, the manufacturing cost is reduced, There are advantages to be able to.

In addition, by using a simple and easy-to-apply coating method, the adhesion of the nanocomposite coating layer to the base film can be increased, the process cost can be reduced, and the durability can be improved.

In addition, it can remarkably improve thermal resistance characteristics, economic efficiency and durability as compared with the prior art, and also blocks infrared rays coming in from the outside through the nanocomposite coating layer and effectively blocks the heat from the outside. It is possible to manufacture an environmentally friendly heat resistant nanocomposite transparent film because it can remarkably improve the energy consumption of vehicles and buildings.

FIG. 1 is a flow chart showing sequentially the method for producing a heat resistant nanocomposite transparent film of the present invention
2 is a cross-sectional view showing the structure of the heat resistant nanocomposite transparent film of the present invention
3 (a) and 3 (b) are cross-sectional views showing the stretched nanoclay orientation of the heat-resistant nanocomposite transparent film coating layer prepared according to the present invention
FIG. 4 is a cross-sectional view showing a stretched nanoclay orientation of a heat-resistant nanocomposite transparent film coating layer produced according to the present invention
5 is a cross-sectional view showing the reflection effect of other infrared rays on the orientation of the nanoclay of the heat-resistant nanocomposite transparent film coating layer produced according to the present invention
6 is a graph showing the transmittance of the heat resistant nanocomposite transparent film according to the present invention
7 is a photograph showing the transmittance of the transparent thermosensitive nanocomposite film produced according to the present invention

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of a method for producing a thermally resistant nanocomposite transparent film according to the present invention will be described in detail with reference to FIGS. 1 to 7. The present invention may be better understood by the following examples, which are for the purpose of illustrating the present invention and are not intended to limit the scope of protection defined by the appended claims.

First, a method for manufacturing a transparent nanocomposite thermally-resistant film according to the present invention will be described. As shown in FIG. 1, the method for producing a thermally 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 a curing step (S50).

2 is a cross-sectional view showing the structure of the heat-resistant nanocomposite transparent film of the present invention, and FIGS. 3 to 4 are cross-sectional views showing the stretched nanoclay orientation of the heat-resistant nanocomposite transparent film coating layer produced according to the present invention .

The first dispersion step S10 is a step of ultrasonically dispersing the nanoclay 21 in a dilution reactant to prepare a first dispersion composition. The nanoclay 21 is uniformly dispersed in the diluting reactant to obtain an optimal thermal resistance This is to implement the characteristics.

 In the first dispersion step (S10), the output of the ultrasonic waves is preferably 5 to 500 W, the dispersion time is preferably 1 to 20 minutes, more preferably 200 to 400 W, and the dispersion time is 10 to 20 minutes It is effective to continue. When the output of the ultrasonic wave is less than 5 W, the output is too weak, the nano-clay 21 is not sufficiently dispersed in the diluting reactant and becomes not uniform, and agglomeration occurs between the nanoclays 21, The transparency of the heat resistant nanocomposite transparent film is reduced. When the output of the ultrasonic wave is more than 500 W, the output is too strong and the nano-clay 21 is broken too shortly, resulting in insufficient heat resistance effect. Likewise, when the dispersion time is less than 1 minute, the time is too short to be effectively dispersed, and when the dispersion time is more than 20 minutes, the problem that the nanoclay 21 is cut too shortly, Occurs.

Further, the output of the ultrasonic wave is repeatedly increased or decreased. This is to reduce the excessive heat generated in the ultrasonic dispersion and disperse the nanoclay 21 more effectively.

The nano-clay 21 may be selected from the group consisting of montmorillonite, bentonite, hectorite, fluorohectorite, saponite, beidelite, nontronite, It is preferably composed of at least one of stevensite, vermiculite, volkonskoite, magadite, kenyalite or derivatives thereof, more preferably an ammonium salt It is effective to comprise at least one of modified montmorillonite, saponite, hectorite and bentonite. This is because the nanoclay 21 modified with the ammonium salt is excellent in compatibility with the polymer resin so as to disperse the nanoclay 21 more effectively.

The dilution reactant may be selected from the group consisting of isobutyl (meth) acrylate, isodecyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, lauryl (meth) acrylate, tetrahydrofurfuryl (Meth) acrylate, stearyl (meth) acrylate and caprolactone acrylate, and more preferably at least one selected from the group consisting of isobornyl acrylate and isobornyl methacrylate . This serves to control the viscosity, so that it is possible to uniformly disperse the nanoclay 21 without agglomeration of the nanoclay 21 and increase the adhesion and flexibility, thereby improving durability.

The content of the nano-clay (21) is preferably 0.1 to 30 parts by weight, more preferably 1 to 25 parts by weight, most preferably 2 to 18 parts by weight based on 100 parts by weight of the diluting reactant It is effective to include. When the amount of the nano-clay (21) is less than 2 parts by weight, the effect of heat shielding is insignificant. When the amount of the nano clay is more than 35 parts by weight, the light blocking ratio of the visible ray is increased excessively, A problem of remarkably lowering occurs.

Next, the second dispersion step (S20) is a step of ultrasonically dispersing the first dispersion composition in a reactive binder to prepare a second dispersion composition, wherein the first dispersion composition is uniformly dispersed in a reactive binder to obtain an optimum heat resistance characteristic To implement it.

In the second dispersion step (S20), it is effective that the output of ultrasonic waves is 80 to 800 W, the dispersion time is 5 to 30 minutes, preferably the output of ultrasonic waves is 400 to 600 W, and the dispersion time is 12 to 25 minutes to be. When the output of the ultrasonic wave is less than 80 W, 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 exceeds 800 W, excessive heat is generated, Occurs. Likewise, when the dispersion time is less than 5 minutes, it is not effectively dispersed, and when the dispersion time is more than 30 minutes, excessive heat is generated to partially cure during dispersion to cause a problem of significantly reducing the thermal resistance characteristic.

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

The reactive binder is preferably composed of an alkyd-based acrylate resin, an ester-based acrylate resin, an epoxy-based acrylate resin or a urethane-based acrylate resin, more preferably a urethane-based acrylate resin. The urethane-based acrylate resin is a non-yellowing resin and contributes to the transparency of the film. The urethane-based acrylate resin improves the adhesion to the base film 10 with a resin having strength and flexibility at the same time, The durability of the film can be improved, and the heat resistance characteristic can be greatly improved.

The content of the first dispersion composition is preferably 30 to 100 parts by weight, more preferably 30 to 80 parts by weight, and most preferably 40 to 60 parts by weight based on 100 parts by weight of the reactive binder. It is effective. When the amount of the first dispersion composition is less than 30 parts by weight, the viscosity of the second dispersion composition is too high to uniformly disperse. When the first dispersion composition is formed into a film, it may cause unevenness and degrade the transparency of the heat resistant nanocomposite film. There arises a problem that the effect of the heat resistance is insignificant because the content of the heat insulating layer 21 is small. When the amount of the second dispersion composition is more than 100 parts by weight, the viscosity of the second dispersion composition is low, which makes it difficult to form a film. Even if a film is formed, the strength is weak and the optimum heat resistance characteristic becomes insignificant.

Next, the coating step (S30) is a step of coating the second dispersion composition on the base film (10). The coating step (S30) is a step of coating the second dispersion composition on the base film It is most preferable to use a method of effectively dispersing and uniformly coating the second dispersion composition containing the nano-clay 21, although it may be coated by any method of die coating.

In addition, it is effective that the thickness of the coated second dispersion composition layer 20 is formed preferably to 10 to 1000 占 퐉, more preferably to 100 to 1000 占 퐉, and most preferably to 300 to 800 占 퐉 . When the thickness is more than 1000 mu m, the thickness is too thick to increase the light-blocking rate of the visible light ray, so that the transparency of the heat-resistant nanocomposite transparent film is remarkably decreased. When the thickness is too large, 2 dispersed composition layer 20 is peeled off from the base film 10, and the optimum heat resistance characteristic is weakened.

Next, the stretching step S40 is a step of stretching the coated base film 10 so that the nano-clay 21 forms an angle with respect to the interface of the base film 10. This is to improve the thermal resistance characteristic by orienting the nano-clay 21 at an optimum angle with respect to the interface of the base film 10.

Here, the structure for forming the angle means that the nano-clay 21 is not parallel to the interface of the base film 10, that is, has an angle other than 0 degree, as shown in Fig.

As shown in Figs. 3 (a) and 3 (b), the nanoclay 21 is oriented in a first array having an angle of 10 to 30 degrees with respect to the interface of the base film 10, It is preferable to be oriented in a second arrangement, more preferably in a first arrangement having an angle of 10 to 20 degrees, or in a second arrangement having an angle of 160 to 170 degrees.

Further, as shown in Fig. 4, it is most effective that the first array and the second array are alternately arranged and oriented. This can improve the economical efficiency by exhibiting the multi-layered structure or the heat resistance effect of various particles by the nano-clay (21) alone without hindering the transparency of the heat-shielding nano-composite transparent film, It is for this reason.

The angle of the first arrangement and the second arrangement is an angle formed by the particles of each of the nano-clays 21 existing in the heat resistant layer 20 and the interface between the heat resistant layer 20 and the base film 10, As shown in FIG. 4, when the first array and the second array are alternately arranged, the angle is the same when viewed from left to right and from the right to the left, Accordingly, the first arrangement and the second arrangement can be changed.

Further, the difference between the orientation angle of the first array or the second array and the actual position of the nanoclay is preferably 0.1 to 5 degrees, more preferably 0.1 to 1 degree. It is ideal that the angle difference is 0 degree. However, since all the nano-clay particles 21 present in the heat resistant layer 20 have various shapes and sizes, it is difficult to form the same angle without error, , By reducing the error range of the orientation angle of the first array or the second array so that the nano-clay 21 is uniformly and uniformly positioned, the reflectivity of the incident infrared rays can be maximized and the thermal resistance characteristic can be remarkably improved. When the angle difference range exceeds 5 degrees, there arises a problem that the reflectance of infrared rays is reduced and the improvement of the thermal resistance characteristic is insignificant.

In addition, the base film coated according to the structure of the first array and the second array is divided into sections and stretched. This is because the nano-clay 21 alone exerts a multi-layer structure or a heat resistance effect of various particles by selectively stretching in consideration of an optimum angle, thereby improving the economical efficiency and realizing the optimum thermal resistance characteristic.

As shown in FIG. 5, the angle range is for effectively controlling the transmittance and the reflectance according to various angles at which the visible ray and the infrared ray are incident. Conventionally, the nano- This is to maximize the resistance effect. In addition, it further improves the overall heat shielding effect of the heat-resistant nanocomposite transparent film by further blocking the light during the daytime, and allows the light to penetrate more than the daytime in the morning or evening, thereby maximizing the internal energy efficiency . If the angle is out of the above range, the transmittance and reflectance of visible light and infrared rays are remarkably lowered, and the heat shield effect is significantly reduced.

The stretching step is preferably performed at 50 to 100 캜, more preferably at 60 to 90 캜, and most preferably at 70 to 80 캜, which is effective for nano-clay angular orientation. This is because the fluidity of the second dispersion composition at the above temperature can help the nano-clay 21 to uniformly orient and improve the heat resistance characteristics.

When the temperature is less than 50 ° C, the fluidity of the coated second dispersion composition 20 is low and the nanoclay 21 is not oriented at a desired angle. When the temperature is higher than 100 ° C, And the problem that the cured second dispersion composition layer 20 is peeled off from the base film 10 occurs.

The stretching step is preferably 10 to 100% stretching, more preferably 20 to 80% stretching. When the elongation percentage (%) is less than 10%, the orientation angle of the nano-clay 21 can not be adjusted, and thus the thermal resistance characteristic is remarkably decreased. When the elongation percentage (% Is too far away and the nanoclay 21 particles are located on the same cross section, there arises a problem that the thermal resistance characteristic is reduced. Accordingly, various elongations (%) can be applied within a preferable range according to the angle of the nano-clay 21 to be oriented.

Next, the curing step (S50) is a step of curing the stretched base film by using at least one of UV and heat. In the case of thermosetting, it is preferable to proceed at 60 to 100 DEG C for 0.5 to 3 minutes, It is effective to proceed for 1 to 2 minutes at 70 to 90 캜. When cured at 60 ° C and less than 0.5 minutes, the cured product is only partially cured and the thermal resistance characteristics are markedly deteriorated. When cured at 100 ° C and over 3 minutes, yellowing occurs to decrease the transparency of the heat resistant transparent film, The adhesion of the second dispersion composition layer 20 to the base film 10 is reduced, resulting in peeling of the second dispersion composition layer 20 from the base film 10, resulting in poor durability.

Further, in the case of UV curing, it is effective to use a mercury lamp, a metal halide or gallium or the like as the ultraviolet ray to be used, and preferably a high pressure mercury lamp which uses 365 nm as the main wavelength. The ultraviolet output is 50 to 200 W / cm, and the irradiation time is preferably 1 to 10 minutes. More preferably, the ultraviolet power is 100 to 150 W / cm, and the irradiation time is 1 to 3 minutes. When the ultraviolet output is less than 50 W / cm and the irradiation time is less than 1 minute, it is only partially cured to deteriorate the heat resistance characteristic. When curing is performed at 200 W / cm and more than 10 minutes, yellowing occurs, The transparency decreases and the coating layer abruptly shrinks, and the adhesion with the base film 10 decreases, resulting in peeling of the second dispersion composition layer 20 resulting in poor durability.

Hereinafter, in order to achieve the above object, the present invention will be described in detail with reference to embodiments in which the thermal resistance is significantly improved by forming the transparent nanocomposite film.

Example  One

The heat-resistant nanocomposite transparent film of the present invention was produced in accordance with the production method of the transparent film. The transparent film was stretched by 50%

Example  2

The heat-resistant nanocomposite transparent film of the present invention was produced in accordance with the production method of the transparent film. The transparent film was stretched by 65%

Example  3

The transparent thermosensitive nanocomposite film of the present invention was produced in accordance with the production method of the transparent film of the present invention. In the stretching step, a transparent film 50% stretched at 15 ° and 165 ° intervals at 80 ° C

Comparative Example  One

A commercially available 3M thermal resistance film

Comparative Example  2

A commercially available heat resistant film from Crystal Bond, Japan

Comparative Example  3

The films used as base films in Examples 1, 2,

Table 1 below shows the heat resistance nanocomposite transparent films (Examples 1, 2 and 3) produced according to the manufacturing method of the present invention and the thermal barrier properties of the conventional thermal barrier films (Comparative Examples 1, 2 and 3) , I) the heat conduction rate, ii) the heat ray blocking rate, iii) the visible light transmittance, and iv) the UV blocking rate.

The overall thermal performance is 10% for UV cut rate, and 30% for all three items.

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

Heat conduction rate = (1 / thermal resistance) = (thermal conductivity / thickness)

Thermal conductivity = (thickness / thermal resistance)

Thermal resistance = (indoor surface heat transfer resistance + thickness of material / thermal conductivity of material)

Heat conduction rate
(U-value)
(Kcal / m ² hr ° C) Heat breaker rate
(IR cut.)
(%) Visible light transmittance
(VLT)
(%) UV cut-off 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, in the case of Examples 1, 2 and 3 according to the present invention, the heat conduction rate and heat conduction rate are about 20% and 35%, respectively, And the visible light transmittance and the UV cut rate were improved by about 10% and about 7%, respectively.

6 is a graph showing the transmittance by wavelength band in the visible light region according to Examples 1, 2, and 3. The lowest transmittance at 400 nm is about 89% in Example 1 and the highest transmittance is about 92% in Example 3. Since the difference between the maximum and the minimum is as small as about 5% and the lowest transmittance is much better than those of Comparative Examples 1 and 2, excellent thermal resistance characteristics are realized in Examples 1, 2 and 3 without decreasing the transmittance in the visible light region .

7 is a photograph of the transmittances of Examples 1, 2, and 3 in comparison. When the films of Examples 1, 2, and 3 were prepared as films, transparency was similar to that of naked eyes, and thus it was found that the heat resistance was excellent without decreasing the transmittance in the visible light region.

Therefore, the heat resistance characteristics of the heat resistant nanocomposite transparent films (Examples 1, 2, and 3) produced by the present invention were far superior to those of Comparative Examples 1, 2, and 3 of the prior art.

In particular, Example 3 of the present invention shows improved thermal resistance characteristics as compared with Examples 1 and 2, and the orientation angle of the nano-clay 21 according to the stretching conditions of the present invention contributes to improvement of the thermal resistance characteristic .

As can be seen from the above experimental results, the heat-resistant nanocomposite transparent film of the present invention has improved economical efficiency due to simplified processes and raw material costs, improved durability and stability, and significantly improved heat resistance And can be applied to a variety of fields such as automobiles as well as buildings as an innovative 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. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

10: base film
20: Second dispersion composition layer
21: Nano clay

Claims (13)

A method of manufacturing a heat resistant nanocomposite transparent film produced by applying a composition in which nanoclay is dispersed to a base film,
A first dispersion step of ultrasonically dispersing the nanoclay in a dilution reaction product to produce a first dispersion composition;
A second dispersion step of ultrasonically dispersing the first dispersion composition in a reactive binder to produce a second dispersion composition;
A coating step of coating the second dispersion composition on the base film;
A stretching step of stretching the coated base film so that the nano-clay 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 nano-clay is 1 to 25 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 40 to 100 parts by weight based on 100 parts by weight of the reactive binder in the second dispersion step. 60 parts by weight,
Wherein the stretching step is in the form of a first arrangement in which the nanoclay is oriented at 10 to 30 degrees with the interface of the base film and a second arrangement in which the nanoclay is oriented at 150 to 170 degrees, Lt; / RTI >
Wherein the stretching step comprises stretching the coated base film by 10 to 100% at 50 to 100 占 폚.
The method according to claim 1,
In the first dispersion step, the output of the ultrasonic waves is 5 to 500 W, the dispersion time is 1 to 20 minutes, the output of the ultrasonic waves in the second dispersion step is 80 to 800 W, and the dispersion time is 5 to 30 Wherein the heat-resistant nanocomposite transparent film has an average particle size of from 1 to 10 nm.
The method according to claim 1,
Wherein the nano-clay is at least one of montmorillonite, saponite, hectorite and bentonite modified with an ammonium salt.
The method according to claim 1,
Wherein the diluting reactant in the first dispersing step is isobornyl acrylate or isobornyl methacrylate and the reactive binder in the second dispersing step is an epoxy type or urethane type acrylate resin. Lt; / RTI >
The method according to claim 1,
Wherein the output of the ultrasonic wave is repeatedly increased or decreased in the first dispersion step and the second dispersion step.
The method according to claim 1,
Wherein the coated second dispersion composition has a thickness in the range of 10 탆 to 1000 탆 in the coating step.
The method according to claim 1,
Wherein the stretching step stretches the base film by sections according to the structure of the first array and the second array.
The method according to claim 1,
Wherein the curing step comprises thermally curing at 60 to 100 ° C for 0.5 to 3 minutes.
The method according to claim 1,
In the curing step, ultraviolet rays or the like used for UV curing may be at least one of mercury lamp, metal halide, gallium and the like, the output of the ultraviolet rays is 50 to 200 W / cm, and the irradiation time is 1 to 10 minutes Wherein the heat-resistant nanocomposite transparent film is a thermally-resistant nanocomposite transparent film.
A heat-resistant nanocomposite transparent film produced by the method for producing a heat-resistant nanocomposite transparent film according to any one of claims 1 to 9. delete delete delete

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