JP2011102401A - Heat-insulation film using hollow nanoparticle comprising silica shell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-insulation film using hollow nanoparticles comprising a silica shell, by utilizing the heat-insulating property and transparency of the hollow particles comprising the silica shell having an outside diameter ranging from about 10 to about 300 nm. <P>SOLUTION: The heat-insulation film utilizing the heat-insulating property and transparency of the hollow particles comprising the silica shell is provided. Colloidal calcium carbonate, silicon alkoxide, and base catalyst are added into water and mixed. Silica which is produced by hydrolysis of the silicon alkoxide is deposited on the surface of the colloidal calcium carbonate, and treated by acid to dissolve calcium carbonate inside silica layer. The hollow particles comprising the nearly cubed silica shell having an outside diameter ranging from about 10 to about 300 nm is uniformly dispersed in a transparent synthetic resin film. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a heat insulating film using nano hollow particles made of silica shells, utilizing the heat insulating properties and transparency of hollow particles made of silica shells having an outer diameter ranging from about 10 nm to about 300 nm.

 Conventionally, as a paint capable of forming a coating film having heat insulation properties, an inorganic or organic fine foam or a fine hollow body using an aggregate as an aggregate has been used. Examples of inorganic fine hollow bodies include shirasu balloons, glass balloons, silica balloons, etc., but these fine hollow bodies have low compressive strength, and most of them are destroyed in the vacuum degassing and kneading step of the paint. Therefore, sufficient heat insulating properties could not be obtained. Moreover, in the coating material which used the organic fine foam and the fine hollow body for the aggregate, the surface hardness of the coating film was remarkably lowered and easily damaged and the weather resistance was also deteriorated.

 Therefore, Patent Document 1 discloses an invention for obtaining a paint having a high heat insulating property by blending ceramic fine hollow particles having a high compressive strength so as to withstand a high stress / shearing force in the process of producing the paint. Yes. Moreover, in patent document 2, by laminating | stacking the sheet | seat laminated material which consists of an inorganic hollow particle layer and a foamable fireproof paint layer on the base-material surface of a fireproof member, the fireproof member which has the outstanding fireproof performance, and its manufacturing method The invention is disclosed.

JP-A-8-127736 JP 2000-96737 A

 However, the ceramic fine hollow particles and the inorganic hollow particles in the techniques described in Patent Document 1 and Patent Document 2 are both large in average particle diameter of 6 μm or more, and therefore, in order to obtain a sufficient heat insulating effect, 100 layers or more are laminated. If it is going to be applied, it has to be applied to a thickness of 0.6 mm or more, and the thickness of the heat-insulating coating film and the refractory member becomes unnecessarily thick, which increases the cost and easily peels off. It was.

Accordingly, the present invention provides a heat insulating film using nano hollow particles made of silica shells utilizing the heat insulating properties and transparency of hollow particles made of silica shells having an outer diameter ranging from about 10 nm to about 300 nm. Is an issue.

A heat insulating film using nano hollow particles made of silica shells according to the invention of claim 1 is a heat insulating film utilizing the heat insulating properties and transparency of hollow particles made of silica shells, in water, colloidal calcium carbonate, Silicon alkoxide and base catalyst are added and mixed, and silica produced by the hydrolysis reaction of silicon alkoxide is precipitated on the colloidal calcium carbonate surface, and then acid treatment is performed to dissolve calcium carbonate inside the silica layer. The hollow particles made of silica shells having an outer diameter in the range of 10 nm to 300 nm having a shape close to a cube are uniformly dispersed in the transparent synthetic resin film.

Insulation film using the hollow nanoparticles made of such silica shell to a second aspect of the invention, in the configuration of claim 1, hollow particles composed of the silica shell are those having an outer diameter of 30Nm～130nm.

The heat insulating film using nano hollow particles made of silica shell according to the invention of claim 3 is the structure of claim 1 or claim 2 , wherein an isocyanate-based surface modifier is applied to the surface of the hollow particles made of silica shell. Hollow particles made of an added coated silica shell are used.

A heat insulating film using nano hollow particles made of silica shells according to the invention of claim 1 is a heat insulating film utilizing the heat insulating properties and transparency of hollow particles made of silica shells, in water, colloidal calcium carbonate, Silicon alkoxide and base catalyst are added and mixed, and silica produced by the hydrolysis reaction of silicon alkoxide is precipitated on the colloidal calcium carbonate surface, and then acid treatment is performed to dissolve calcium carbonate inside the silica layer. The hollow particles made of silica shells having an outer diameter in the range of 10 nm to 300 nm having a shape close to a cube are uniformly dispersed in the transparent synthetic resin film.

Accordingly, the heat insulating film using the nano hollow particles made of silica shell according to the present invention has a thin film thickness of about 30 μm or less, like the heat insulating film using the nano hollow particles made of silica shell according to the invention of claim 1. In addition, it exhibits excellent heat insulation properties, and nano hollow particles made of silica shells are almost completely transparent because the wall thickness is as thin as several nanometers to several tens of nanometers. Therefore, they are uniformly dispersed in a transparent synthetic resin film. As a result, the formed heat insulating film becomes almost completely transparent.

 As described above, the nano hollow particles made of silica shells have a small particle size of 10 nm to 300 nm. Therefore, even if 100 or more layers are laminated in order to obtain a sufficient heat insulating effect, the film thickness is as very thin as about 30 μm or less. A sufficient heat insulating effect can be obtained, and a thin, transparent and durable heat insulating film can be obtained while being formed at low cost.

 Therefore, for example, by sticking a synthetic resin film printed with a woodgrain pattern on a non-combustible panel and then applying a heat insulating film according to the present invention from above, the woodgrain pattern of the synthetic resin film is completely In the visible state, it can be a non-combustible panel.

 In this way, a heat insulating film using nano hollow particles made of a thin, transparent and strong silica shell utilizing the heat insulation and transparency of hollow particles made of a silica shell having an outer diameter in the range of 10 nm to 300 nm, and Become.

In the heat insulating film using the nano hollow particles made of the silica shell according to the invention of claim 2, the hollow particles made of the silica shell have an outer diameter of 30 nm to 130 nm, more preferably 50 nm to 100 nm.

In particular, in the heat insulating film using nano hollow particles made of silica shell according to claim 1 , hollow particles made of silica shell having an outer diameter in the range of 10 nm to 300 nm are used, but the outer diameter is too small. Hollow particles composed of small silica shells are difficult to produce and are prone to agglomeration even if they can be produced. On the other hand, hollow particles made of a silica shell having a very large outer diameter halve the merit of using nano hollow particles made of silica shell.

 Therefore, as a result of earnest experimental research by the inventors, hollow particles composed of silica shells having an outer diameter of 30 nm to 130 nm, more preferably 50 nm to 100 nm are most easily produced, and aggregation is unlikely to occur. The inventors have found that merits of using particles can be sufficiently exhibited, and have completed the present invention based on this finding.

 Thus, it becomes a heat insulation film using the nano hollow particle which consists of a silica shell using the heat insulation and transparency of the hollow particle which consists of a silica shell which has an outer diameter of 30 nm-130 nm, More preferably, 50 nm-100 nm.

The heat insulating film using nano hollow particles made of silica shell according to the invention of claim 3 uses hollow particles made of coated silica shell in which an isocyanate surface modifier is added to the surface of the hollow particle made of silica shell. It was.

 Here, as described above, the “isocyanate-based surface modifier” means a surface modifier composed of a compound having one or more isocyanate groups (—N═C═O). Examples include triisocyanate compounds in which three isocyanate groups are bonded to an alkyl group, triethoxypropyl isocyanate silane (TEIS), and the like.

 Such an isocyanate-based surface modifier is added via a hydroxyl group (—OH) present on the surface of a hollow particle made of silica shell, and the entire surface of the hollow particle made of silica shell is modified with an isocyanate-based surface. By coating with an agent, re-aggregation can be prevented and dispersibility is improved, and when mixed into a synthetic resin, the active group of the synthetic resin reacts with an isocyanate group, thereby A strong bond with hollow particles made of silica shell is obtained.

 In this way, when mixed in a synthetic resin, the dispersibility is improved and a strong bond between the synthetic resin and the hollow particles made of silica shell is obtained, and the heat insulation and transparency of the hollow particles made of silica shell are improved. It becomes the heat insulation film using the nano hollow particle which consists of the utilized silica shell.

FIG. 1A is a partial cross-sectional view showing a configuration of a flame-retardant board using a heat-insulating paint according to Reference Example 1 of the present invention, and FIG. 1B shows a state after a combustion test of a conventional non-combustible material made of wood. It is sectional drawing. FIG. 2 is a partial cross-sectional view showing a configuration of a glass plate to which a heat insulating film using the heat insulating paint according to the first embodiment of the present invention is attached. FIG. 3 is an explanatory view showing a method for manufacturing a heat insulating film according to the second embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing a configuration of a glass plate to which a heat insulating film according to Embodiment 2 of the present invention is attached. Fig.5 (a) is the elements on larger scale which show the internal structure of the heat insulation fiber concerning the reference example 2 of this invention, (b) is the elements on larger scale which show the internal structure of the conventional heat insulation fiber. FIG. 6 is a perspective view and a partially enlarged view showing an overall configuration of a parasol manufactured using a heat insulating fiber according to Reference Example 2 of the present invention. FIG. 7 is an overall view and a partially enlarged view showing a curtain manufactured using the heat insulating fiber according to Reference Example 3 of the present invention and a scene seen through the curtain. FIG. 8 is a schematic view showing a process for producing hollow particles comprising a coated silica shell used for producing a heat insulating paint, a heat insulating film and a heat insulating fiber according to Reference Example 4 of the present invention.

 Embodiments of the present invention will be described below with reference to the drawings.

Reference example 1
First, a heat insulating paint according to Reference Example 1 of the present invention will be described with reference to FIG. FIG. 1A is a partial cross-sectional view showing a configuration of a flame-retardant board using a heat-insulating paint according to Reference Example 1 of the present invention, and FIG. 1B shows a state after a combustion test of a conventional non-combustible material made of wood. It is sectional drawing.

 Initially, the manufacturing method of the hollow particle which consists of a silica shell which has the outer diameter of the range from about 10 nm to about 300 nm is demonstrated. Colloidal calcium carbonate, silicon alkoxide, and a base catalyst are charged and mixed in 75% by volume or more of water, and silica produced by the hydrolysis reaction of silicon alkoxide is precipitated on the colloidal calcium carbonate surface. Then, the calcium carbonate inside a silica layer is dissolved by acid treatment. As a result, hollow particles made of silica shells having an outer diameter in the range of about 10 nm to about 300 nm are produced.

 Next, the test result about the heat insulation of the nano hollow particle which consists of the silica shell manufactured in this way is demonstrated. As shown in Example 1 of Table 1, nano hollow particles composed of silica shells were mixed in a solid content of 10.81% by weight and a synthetic resin (polyester resin) in a solid content of 89.19% by weight. A heat insulating paint was prepared and dried to form a coating film. For comparison, as Comparative Example 1, thermal conductivity was measured using 0% by weight of nano hollow particles made of silica shell, 100% by weight of a synthetic resin (polyester resin), that is, using the polyester resin itself as a specimen. The results are shown in Table 2.

 As shown in Table 2, the thermal conductivity of the thermal insulation coating film of Example 1 is as small as 0.15 W / (m · K), and the thermal conductivity of the polyester resin alone (0.29 W / (m · K). It is about half of K)). Thereby, it was confirmed that the heat-insulating coating composition of Example 1 shown in Table 1 exhibits excellent heat insulating properties.

Next, the example which applied the heat insulation coating of the mixing | blending of this Example 1 to the incombustible panel is demonstrated with reference to Fig.1 (a). As shown in FIG. 1 (a), the heat insulating paint 2 according to the first reference example is obtained by applying a sanding sealer 4 on the incombustible panel 5 so that the surface of the incombustible panel 5 can be easily adhered and removed. Then, a wood grain printed film 3 obtained by performing wood grain printing on a polyethylene film is adhered thereon, and then applied to a thickness of about 20 μm to give heat resistance.

 Here, as shown in FIG. 1B, as a result of a 30-minute combustion test of the laminated beam 7 used as a conventional incombustible material, a carbonized layer 8 is formed on the surface layer by the flame. It has been certified as non-combustible because it impedes the penetration of oxygen and the supply of oxygen.

This is largely due to the high thermal insulation of the wood part, the thermal conductivity of the wood is 0.15, and the thermal conductivity of the thermal insulation paint 2 according to the reference example 1 shown in FIG. As shown, since it is 0.15, it is possible to obtain the same heat insulating property as wood, and without using wood, the woodgrain print film 3 made of polyethylene film burns in a flame with a transparent flame retardant layer. (Insulating paint) 2 can be prevented, and the wood-grained panel 6 as a whole can be certified as non-combustible.

Thus, the heat insulating paint 2 according to the present Reference Example 1 is a nano hollow made of a silica shell utilizing the heat insulating property and transparency of a hollow particle made of a silica shell having an outer diameter ranging from about 10 nm to about 300 nm. It becomes a heat insulating paint using particles.

Embodiment 1
Next, the heat insulation coating material and heat insulation film concerning Embodiment 1 of this invention are demonstrated with reference to FIG. FIG. 2 is a partial cross-sectional view showing a configuration of a glass plate to which a heat insulating film using the heat insulating paint according to the first embodiment of the present invention is attached.

As shown in FIG. 2, the heat insulating film 10 according to the first embodiment is a heat insulating film that is affixed to the inside of office building or home window glass, automobile window glass, and the like. It is far superior in heat insulation than that. The conventional heat insulating film 11 is a film on which a metal such as gold, silver, or ITO (Indium Tin Oxide) is deposited on a film having a thickness of about 20 μm to 30 μm made of PET (polyethylene terephthalate) resin. Was affixed to the inside of the window glass to reflect sunlight and to insulate.

 As shown in FIG. 2, 4% to 5% of sunlight is reflected on the surface of the glass 12 serving as a base material, and the near-infrared ray is formed by a metal vapor deposition film (thickness of several tens of nm) of the conventional heat insulating film 11. In the meantime, near-infrared rays (heat rays) are absorbed by the glass 12 serving as the base material and diffused into both the inner and outer surfaces according to the difference in thermal conductivity between the two surfaces. When only the conventional heat insulating film 11 was attached, heat was dissipated inside because there was no difference in thermal conductivity between both surfaces.

On the other hand, the heat insulating film 10 according to the first embodiment is obtained by uniformly applying the heat insulating paint 2 according to the reference example 1 to the conventional heat insulating film 11 to a thickness of about 20 μm to 30 μm with a roll coater. is there. As shown in FIG. 2, by sticking the heat insulating film 10 to the glass 12 so that the coating film of the heat insulating paint 2 is on the inside, the difference in thermal conductivity between the surfaces of both surfaces becomes large, Since the heat absorbed by the resulting glass 12 is released to the outside, excellent heat insulation can be obtained.

 When used for an office building or home window glass, it is sufficient that the transmittance of visible light is about 60%. Therefore, the thickness of the metal vapor deposition film of the heat insulating film 11 is increased to increase the reflectance of near infrared rays. However, when it is used for a window glass of an automobile, the transmittance of visible light is required to be 80% or more for safety reasons, and therefore the thickness of the metal vapor deposition film of the heat insulating film 11 is limited.

Moreover, in the heat insulation film 10 concerning this Embodiment 1 , although the heat insulation coating material 2 concerning the reference example 1 is apply | coated to the thickness of about 20 micrometers-30 micrometers uniformly with the roll coater in the conventional heat insulation film 11. Instead of the layer of the heat insulating paint 2 shown in FIG. 2, a heat insulating film having a thickness of about 20 μm to 30 μm may be attached. This heat insulating film is obtained by uniformly dispersing hollow particles made of silica shells having an outer diameter in the range of about 50 nm to about 100 nm in a PET (polyethylene terephthalate) resin. The method for manufacturing the heat insulating film will be described later in Embodiment 2 .

Embodiment 2
Next, the heat insulation film concerning Embodiment 2 of this invention is demonstrated with reference to FIG.3 and FIG.4. FIG. 3 is an explanatory view showing a method for manufacturing a heat insulating film according to the second embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing a configuration of a glass plate to which a heat insulating film according to Embodiment 2 of the present invention is attached.

As shown in FIG. 3, the heat insulating film 15 according to the second embodiment includes a hollow particle 1 made of a silica shell having an outer diameter in the range of about 50 nm to about 100 nm and a raw material of PET (polyethylene terephthalate) resin 14. The particles are put into a kneader at a weight ratio of about 10 to about 90, and heated and kneaded at a temperature at which the PET resin 14 is softened (about 260 ° C.) or higher (step S1). Thereby, the PET resin 14 in which the hollow particles 1 made of the uniformly mixed silica shells are dispersed is calendered using a calendering machine (step S2). In this way, a transparent heat insulating film 15 having a thickness of about 20 μm to 30 μm is manufactured.

Next, an example of how to use the manufactured transparent heat insulation film 15 will be described with reference to FIG. As shown in FIG. 4, the transparent heat insulation film 15 according to the second embodiment is a heat insulation film that is affixed to the inside of a multilayer interference film that is mainly formed inside the window glass of an automobile. By forming a thin multilayer film having a refractive index different from that of glass, the film reflects light having a wavelength other than the wavelength to be transmitted by utilizing reflection interference between the front surface and the back surface of the film.

As shown in FIG. 4, since this multilayer interference film does not require the use of metal vapor deposition or metal sputtering, when a car navigation system or ETC (Electronic Toll Collection System) vehicle-mounted device is mounted on an automobile, It has the feature of not causing radio wave interference. However, since the glass as the base material absorbs heat rays is the same as in the first embodiment, a transparent heat insulating film 15 having a thickness of about 20 μm to 30 μm is formed inside the innermost PET layer. By sticking, heat can be efficiently released to the outside without reducing the visible light transmittance. The innermost hard coat 16 is a transparent and hard layer for preventing the transparent heat insulating film 15 from being damaged.

Thus, in the heat insulation film 15 concerning this Embodiment 2 , it consists of a silica shell using the heat insulation and transparency of the hollow particle which consists of a silica shell which has the outer diameter of the range from about 50 nm to about 100 nm. It becomes a heat insulation film using nano hollow particles.

Incidentally, a heat insulating film 15 according to the second embodiment, UV (ultraviolet) cut film and, IR (infrared) and a cut film as a three-layer structure by bonding with an adhesive, as in the second embodiment the glass The UV cut film prevents the ultraviolet rays contained in the external sun rays from being transmitted, and the IR cut film prevents the infrared rays (heat rays) contained in the external sun rays from being transmitted. In addition, by preventing the infrared heat absorbed by the base material from being radiated to the inside by the heat insulating film 15, an excellent heat insulating effect is exhibited while allowing only visible light to pass therethrough.

 For this reason, by adhering to the window glass of an automobile, the window glass of an office building / household, etc., it is possible to further block the penetration of heat and the transmission of ultraviolet rays by sunlight without disturbing the field of view.

 In this way, from the thin and strong silica shell that exhibits the excellent heat insulation effect without hindering the field of view, utilizing the heat insulation property of the hollow particles made of the silica shell having an outer diameter in the range of about 10 nm to about 300 nm. It becomes the three-layer heat insulation film which applied the heat insulation film using the nano hollow particle.

Reference example 2
Next, the heat insulation fiber concerning the reference example 2 of this invention is demonstrated with reference to FIG.5 and FIG.6. Fig.5 (a) is the elements on larger scale which show the internal structure of the heat insulation fiber concerning the reference example 2 of this invention, (b) is the elements on larger scale which show the internal structure of the conventional heat insulation fiber. FIG. 6 is a perspective view and a partially enlarged view showing an overall configuration of a parasol manufactured using a heat insulating fiber according to Reference Example 2 of the present invention.

As shown in FIG. 5A, the heat insulating fiber 20 according to the present reference example 2 is obtained by uniformly dispersing nano hollow particles 1 made of silica shells inside an opaque synthetic fiber 21. Here, the nano hollow particle 1 made of silica shell has a shape closer to a cube than a spherical shape. This is because the colloidal calcium carbonate is formed into a cube in the manufacturing process of the nano hollow particle 1 made of silica shell. Because of the close shape, when the silica produced by the hydrolysis reaction of silicon alkoxide is precipitated on the colloidal calcium carbonate surface, the precipitated silica layer also has a shape close to a cube, and the calcium carbonate inside the silica layer is reduced. Nano hollow particles 1 made of silica shells obtained by dissolution also have a shape close to a cube.

The heat insulating fiber 20 according to Reference Example 2 is obtained by spinning nano hollow particles 1 made of silica shells having an outer diameter ranging from about 50 nm to about 100 nm after uniformly dispersing them in an opaque synthetic fiber raw material. is there. As shown in FIG. 5B, the conventional heat insulating fiber 22 has a structure in which the special ceramic particles 23 are dispersed in the fiber 24 that absorbs ultraviolet rays and simultaneously shields the entire sunlight to reflect the sunlight. However, there has been a problem that sunlight is absorbed and stored in the fibers 24.

On the other hand, the heat insulating fiber 20 according to the present Reference Example 2 has a low thermal conductivity and excellent heat insulating properties because the nano hollow particles 1 made of silica shells are uniformly dispersed inside the synthetic fiber 21. Since the heat dissipation effect is also obtained, it has a feature that it is cool in summer and warm in winter.

As an example, as shown in FIG. 6, in the parasol 26 using the fabric woven with the heat insulating fibers 20 according to the present Reference Example 2 , the heat insulating fibers 20 have low heat conductivity and excellent heat insulating properties. While reflecting, since the heat conductivity of the heat insulating fiber 20 is low, it is possible to prevent sunlight from being absorbed and stored, and a cool feeling can be given to the user.

Thus, in the heat insulating fiber 20 according to the present Reference Example 2 , by utilizing the heat insulating property of the nano hollow particles 1 made of the silica shell having the outer diameter in the range of about 50 nm to about 100 nm, the fabric of the parasol It can be used as fabrics, curtains and clothing, and can form fabrics that are cool in summer and warm in winter.

Reference example 3
Next, the heat insulating fiber according to Reference Example 3 of the present invention will be described with reference to FIG. FIG. 7 is an overall view and a partially enlarged view showing a curtain manufactured using the heat insulating fiber according to Reference Example 3 of the present invention and a scene seen through the curtain.

The heat insulating fiber 19 according to this reference example 3 is a silica shell having an outer diameter in the range of about 50 nm to about 100 nm using a transparent synthetic fiber raw material instead of the opaque synthetic fiber 21 in FIG. The nano hollow particles 1 made of are uniformly dispersed in a transparent synthetic fiber raw material and then spun. Therefore, since the nano hollow particle 1 made of silica shell is transparent, the heat insulating fiber 19 according to the present Reference Example 3 is also almost transparent.

 As shown in FIG. 7, since the curtain 18 formed by weaving the heat insulating fibers 19 is translucent, it is possible to see the scenery from the inside and the outside from the outside like the lace curtain. It is not possible. And since the heat insulating fiber 19 has a low thermal conductivity, it has an excellent heat insulating property, and becomes an ideal curtain 18 that is cool in summer and warm in winter.

Thus, in the heat insulating fiber 19 according to the present Reference Example 3 , by utilizing the heat insulating property and transparency of the nano hollow particles 1 made of silica shells having an outer diameter in the range from about 50 nm to about 100 nm, It can be used in place of lace curtains and lace fabrics to form fabrics that are cool in summer and warm in winter.

Reference example 4
Next, a heat insulating paint, a heat insulating film, and a heat insulating fiber according to Reference Example 4 of the present invention will be described with reference to FIG. FIG. 8 is a schematic view showing a process for producing hollow particles comprising a coated silica shell used for producing a heat insulating paint, a heat insulating film and a heat insulating fiber according to Reference Example 4 of the present invention.

Since the hollow nanoparticle 1 made of silica shell used in Reference Example 1 to Reference Example 3 is a nano-level fine particle having an outer diameter in the range of about 10 nm to about 300 nm or about 50 nm to about 100 nm. Various devices have been devised to facilitate aggregation and dispersion. On the other hand, as shown in FIG. 8, the hollow particles 31 made of the coated silica shell according to Reference Example 4 have the surface of the nano hollow particles 1 made of the silica shell covered with an isocyanate-based surface modifier 30. Therefore, it is difficult to aggregate and easy to disperse.

A manufacturing process of the hollow particles 31 made of the coated silica shell according to the reference example 4 will be described with reference to FIG. As shown in FIG. 8, the surface of the nano hollow particle 1 made of silica shell has innumerable hydroxyl groups. In FIG. 8, only three of the innumerable hydroxyl groups are shown for easy understanding of the reaction. In contrast, by reacting triethoxypropyl isocyanate silane (hereinafter also referred to as “TEIS”) 30 as an isocyanate-based surface modifier in an autoclave at xylene critical temperature for 2 hours using xylene as a solvent, All of the three ethoxy groups of TEIS 30 are condensed with the three hydroxyl groups on the surface of the nano hollow particle 1 made of silica shell, and bonded to the surface of the nano hollow particle 1 made of silica shell.

Thus, TEIS30 reacts with the innumerable hydroxyl groups on the surface of the nano hollow particle 1 made of silica shell, and the surface of the nano hollow particle 1 made of silica shell is covered with TEIS 30, and this Reference Example 4 is applied. Hollow particles 31 made of a coated silica shell are formed. This makes it easy to disperse and not only easily disperse, but also allows the isocyanate group to react with the active group of the synthetic resin to form a strong bond with the synthetic resin, thereby facilitating uniform dispersion in the synthetic resin. It becomes the hollow particle 31 which consists of a silica shell.

Therefore, in place of the nano hollow particles 1 made of the silica shell used in Reference Examples 1 to 3 , the hollow particles 31 made of the coated silica shell according to Reference Example 4 are used in the synthetic resin. When mixed, the dispersibility is improved, and a strong bond between the synthetic resin and the nano hollow particles 1 made of silica shell can be obtained.

Thus, by using the hollow particles 31 made of the coated silica shell according to the present Reference Example 4 , the dispersibility improves when mixed in the synthetic resin, and the nano hollow particles 1 made of the synthetic resin and the silica shell A heat insulating coating, a heat insulating film, a three-layer heat insulating film, or a heat insulating fiber using the nano hollow particles 1 made of a silica shell utilizing the heat insulating properties and transparency of the nano hollow particles 1 made of a silica shell. Become.

 In practicing the present invention, the heat insulating paint, heat insulating film or three-layer heat insulating film using nano hollow particles made of silica shell, the configuration, components, shape, quantity, material, size, and other parts of the heat insulating fiber are manufactured. The method and the like are not limited to the above embodiments.

DESCRIPTION OF SYMBOLS 1 Nano hollow particle which consists of silica shells 2 Heat insulation paint 3 Woodgrain print film 5 Nonflammable panel 10,15 Heat insulation film 14 PET
19, 20 Heat-insulating fiber 30 Isocyanate-based surface modifier 31 Hollow particles made of coated silica shell

Claims (3)

A heat insulation film utilizing the heat insulation and transparency of hollow particles made of silica shell,
In water, colloidal calcium carbonate, silicon alkoxide, and a base catalyst are added and mixed, and silica produced by the hydrolysis reaction of silicon alkoxide is precipitated on the colloidal calcium carbonate surface, and then acid-treated. It is characterized by uniformly dispersing hollow particles made of silica shells having an outer diameter in the range of 10 nm to 300 nm in a shape close to a cube, in which calcium carbonate in the silica layer is dissolved, in a transparent synthetic resin film. Thermal insulation film using nano hollow particles made of silica shell. The heat insulating film using nano hollow particles made of silica shells according to claim 1 , wherein the hollow particles made of silica shells have an outer diameter of 30 nm to 130 nm. 3. The silica shell according to claim 1, wherein hollow particles made of a coated silica shell obtained by adding an isocyanate-based surface modifier to the surface of the hollow particle made of the silica shell are used. Thermal insulation film using nano hollow particles.

Images