JP2000062105A - Structure having transparent layer composed of fluorinecontaining polymer and reflecting sheet using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat ray-reflecting structure having heat resistance, non- adhering characteristics, stainproof characteristics, chemical resistance, weathering resistance or the like without harming reflecting efficiency. SOLUTION: A structure is formed by directly adhering a base and a layer composed of a fluorine-containing polymer without using a binder therebetween. An infrared ray permissivity of the layer composed of fluorine-containing polymer is 85% or higher and a contact angle with water of a surface thereof is 95 degrees or more. A decomposition heat resistance temperature of 1% weight loss of the fluorine-containing polymer is 300 deg.C, or higher and a crystalline melting point thereof is 250 deg.C or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a fluoropolymer layer having heat resistance and non-adhesiveness is adhered to a substrate while maintaining transparency. The present invention relates to a structure with improved reflectance, and further to a reflection plate with improved infrared reflectance using the structure.

[0002]

2. Description of the Related Art For heat sinks and reflectors of heating equipment having heaters such as electric stoves, gas stoves, oil stoves, heat sinks of gas stoves, microwave ovens, oven toasters, inner walls of cookers such as grilled fish. In order to prevent the heat (radiant heat) from escaping or to collect it at a certain point, a member with a bright metallic finish by applying a bright treatment to an aluminum hot-dip plated steel plate, a stainless steel plate, a member with high reflectance such as mirrors, etc. It is used.

As these members are used, the original reflectance is impaired due to rust, corrosion, discoloration, adhesion of oily dirt, scorching dirt, adhesion and accumulation of dust, etc., and heat concentration and energy use efficiency are poor. turn into. Therefore, depending on each application, non-adhesiveness, antifouling property, heat resistance,
It is desired to apply a material having properties such as weather resistance and chemical resistance to a base material without impairing the reflectance and gloss of the base to maintain the reflection efficiency of radiant heat.

On the other hand, the fluorine-containing polymer is particularly excellent in heat resistance, antifouling property, non-adhesiveness, weather resistance and chemical resistance.
It can be said that a paint or a film formed by using them for coating is a preferable material. Especially, PTFE, PFA, FE
A material using a fluororesin having a high heat resistance (300 ° C. or higher) and a high melting point (250 ° C. or higher) represented by P is considered to be an optimum material. However, these fluoropolymers, due to their excellent non-stick property to be utilized,
There is an essential problem that the adhesion to a substrate such as metal is not sufficient.

As a method of adhering a fluoropolymer and a substrate such as a metal, there are the following methods, for example.

1. A method of physically roughening the surface of a substrate by sandblasting.

2. A method in which a primer layer containing heat-resistant engineering plastic, metal powder, etc. as a main component is provided between the base material and the fluoropolymer.

3. A method in which a fluoropolymer is formed into a film and the adhesive surface is subjected to a chemical surface treatment such as sodium etching.

4. Method using an adhesive.

It is known to carry out these methods alone or in combination. With respect to Nos. 1 and 2, the reflectance of the base material is significantly reduced only by performing these treatments. With respect to 3, even if the film is colored to reduce the reflectance of the laminate and a transparent surface treatment is possible, the adhesive strength is insufficient by itself, and peeling occurs due to thermal deformation when used at high temperature. In the end, it must be combined with the methods 1, 2, and 4, and the reflectance of the base material is significantly reduced. With respect to No. 4, the adhesive itself has no transparency to reduce the reflectance, or the adhesive has insufficient heat resistance and causes coloring, whitening, foaming, and peeling at the time of use at a high temperature, and the reflectance decreases.

Further, even if a transparent coating is possible by combining the above methods, the reflectance of the metal itself is lowered by the treatment of the metal surface, or the material used as the adhesive layer or the material coated on it is coated. Sufficient heat ray reflectance cannot be obtained due to absorption (loss) of infrared rays by the fluoropolymer itself, absorption (loss) of infrared rays at each interface between the substrate, the adhesive layer and the fluoropolymer layer.

That is, there has not been obtained a structure in which a transparent layer made of a fluoropolymer is adhered to a base material without impeding heat reflection of the base material to impart heat resistance and non-adhesiveness.

[0013]

In view of the above facts, an object of the present invention is to provide a structure in which a base material mainly used for reflecting heat is coated with a layer made of a fluoropolymer, An object of the present invention is to provide a structure in which the base material has functions such as heat resistance, non-adhesiveness, antifouling property, chemical resistance, and weather resistance without deteriorating the reflection efficiency of the base material. Still another object is to provide a reflector and a heat ray reflector using these structures.

[0014]

The present invention is a structure in which a base material and a layer made of a fluoropolymer are directly adhered to each other without a binder, and the infrared transmittance of the layer made of the fluoropolymer is 85. %, The surface contact angle with water is 95 degrees or more, the 1% weight loss decomposition heat resistance temperature of the fluoropolymer is 300 ° C. or more, and the crystalline melting point is 250 ° C. or more.

In this case, the infrared transmittance of the layer made of the fluoropolymer is preferably 95% or more.

Further, the thickness of the layer made of the fluoropolymer is preferably 0.01 to 5 μm.

The thickness of the fluoropolymer layer is preferably 2 μm or less.

The contact angle of water with respect to the surface of the layer comprising the fluoropolymer is preferably 100 degrees or more.

The crystalline melting point of the fluoropolymer is 30.
It is preferably 0 ° C. or higher.

The base material is preferably a metal plate having a high infrared reflectance.

Further, it is preferable that the base material is made of a stainless material.

The base material is preferably made of an aluminum material.

The present invention also relates to a reflector using the above structure.

Further, the present invention also relates to a heat ray reflection plate using the above structure.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION As a result of repeated studies to achieve the above-mentioned object, the present inventors have found that a layer of a specific fluorine-containing polymer having heat resistance and non-adhesiveness is formed without interposing an adhesive layer such as a binder. It was found that the structure obtained by directly adhering to the substrate can exhibit the reflectance of the substrate most effectively without loss.

The layer of fluoropolymer used in the present invention is
It is necessary that the infrared transmittance is 85% or more (Requirement 1) and the surface contact angle with water is 95 degrees or more (Requirement 2). Further, it is necessary for the fluoropolymer constituting the layer to have a 1% weight loss decomposition heat resistance temperature of 300 ° C. or higher (Requirement 3) and a crystalline melting point of 250 ° C. or higher (Requirement 4).

Regarding the infrared transmittance, the infrared transmittance of the entire layer comprising the fluoropolymer is 85% or more, and the infrared transmittance is in the wavelength range of 4000 to 400 Å measured by an infrared absorption spectrometer. Expressed as the integrated average value of. If it is less than 85%, the heat energy is lost before reaching the base material or before it is reflected by the base material and goes out into the air, so that sufficient reflection efficiency cannot be obtained. Particularly preferably, the layer comprising the fluoropolymer is 9
It has an infrared transmittance of 5% or more.

Regarding the contact angle with water, the layer made of the fluoropolymer of the present invention has a surface contact angle with water of not less than 95 degrees. This is because those having a low contact angle have poor non-adhesiveness and antifouling property, and dust or dirt adheres during use, thereby reducing the reflection efficiency of the structure. Also, depending on the application, such as heating cookers,
Those having a high possibility of sticking or burning of oil or foods preferably have a contact angle with water of 100 degrees or more.

The layer made of the fluoropolymer needs to have sufficient heat resistance, and the 1% weight loss decomposition heat resistance temperature showing this heat resistance is measured using a DTGA analyzer. The fluorine-containing polymer in the present invention has a temperature of 1% weight loss in air of 300 ° C. or higher, and one having a low thermal decomposition temperature is originally inappropriate for the purpose of the present invention to reflect heat, When using a heater for heating, a cooking device, etc., exposed to air, foaming, peeling, or coloring of the layer occurs, and the infrared transmittance of the layer itself is reduced to less than 85%, and the reflection efficiency of the structure itself is reduced. I will end up. In the present invention, although depending on the actual application, it is preferably 320 ° C or higher, most preferably 330 ° C or higher.
Use a material that has a heat resistance temperature of% weight loss decomposition.

Regarding the crystalline melting point, in the present invention, the fluoropolymer constituting the layer comprising the fluoropolymer is
It has a high crystal melting point of 250 ° C. or higher. If the melting point is too low, the layer will not melt and the shape will not be kept stable during use at high temperature, or the mechanical strength of the layer will be extremely reduced, resulting in poor wear resistance or scratches. It becomes easier to attach. Although it depends on the use, it is particularly preferable that the crystal melting point is 300 ° C. or higher.

The fluorine-containing polymer satisfying the above-mentioned requirements 3 and 4 capable of providing a layer made of the fluorine-containing polymer satisfying the above-mentioned requirements 1 and 2 is specifically a fluorine-containing polymer containing tetrafluoroethylene as a main component. Is preferred. More specifically, the following can be mentioned.

(1) Tetrafluoroethylene homopolymer (PTFE) or tetrafluoroethylene copolymer containing 99.7 mol% or more of tetrafluoroethylene (so-called modified PTFE).

This fluorine-containing polymer is most excellent in heat resistance, chemical resistance and non-adhesiveness, and is also excellent in that it has slidability (low friction and abrasion resistance).

(2) Tetrafluoroethylene 85-9
9.7 mol% and formula (1): CF ₂ ═CFR _f (1) [R _f is CF ₃ , OR _f ¹ (R _f ¹ is a perfluoroalkyl having 1 to 5 carbon atoms)] 0.3 to 15 mol%
With the polymer. Specifically, a copolymer of tetrafluoroethylene and perfluoro (propyl vinyl ether) (P
FA), a copolymer of tetrafluoroethylene and hexafluoropropylene (FEP), a terpolymer of tetrafluoroethylene and perfluoro (propyl vinyl ether) and hexafluoropropylene, tetrafluoroethylene and perfluoro (propyl vinyl ether) ) And perfluoro (methyl vinyl ether).

These fluoropolymers (2) have almost the same heat resistance, chemical resistance and non-adhesiveness as those of the fluoropolymer (1), and also have the transparency and the ability to be melted. Even if it is applied in the form, it is excellent in that it can be made transparent and surface smoothed by heat.

(3) Tetrafluoroethylene 40-80
Polymer (ETFE) with mol%, 20 to 60 mol% of ethylene, and 0 to 15 mol% of other copolymerizable monomer.

This fluoropolymer has excellent heat resistance, antifouling property and weather resistance, is excellent in transparency, has excellent mechanical strength, is hard and tough, and has melt flowability. Is excellent in that it can be processed at a relatively low temperature and can be easily compounded (laminated, etc.) with a resin-based substrate.

The layer made of the fluoropolymer in the structure of the present invention is preferably a continuous layer having the fluoropolymer as a matrix, and basically, a film formed into a film made of the fluoropolymer only. Is preferable, and the excellent surface properties such as non-adhesiveness, antifouling property, water repellency and low friction property of the fluoropolymer can be most preferably utilized without lowering the transparency and the reflectance.

Further, an inorganic or organic filler can be dispersed in a continuous layer using a fluoropolymer as a matrix within a range that does not deteriorate the reflectance when the structure is formed or the excellent properties of the fluoropolymer. . For example, fine particles of silica (such as colloidal silica) may be dispersed in the continuous layer for the purpose of improving the mechanical properties and abrasion resistance of the layer of fluoropolymer.

Next, the base material will be described. The structure of the present invention is obtained by adhering the above-mentioned fluoropolymer to a base material, and the base material is selected variously according to the application,
In the structure of the present invention, the base material is used for the purpose of transferring and transmitting thermal energy such as radiant heat, radiant heat and infrared rays, and at that time, it is selected from the base materials that have a small loss of thermal energy. Specifically, a base material used for heat reflection (reflection plate), a base material used for heat collection (heat collection plate), and the like are generally used.

For example, as a base material for the purpose of reflecting heat, a metal plate having a high reflectance is preferable. Specifically, a metal such as aluminum, nickel, chromium, silver or an alloy containing these metals is preferable. Preferred examples include the class.

Specific examples of alloys include Ni steel and Cr.
Steel, Ni-Cr steel, Cr-Mo steel, stainless steel, silicon steel, alloy steels such as permalloy, Al-Cl, Al-M
g, Al-Si, Ai-Cu-Ni-Mg, Al-Si
-Cu-Ni-Mg and other aluminum alloys, brass, bronze (bronze), silicon bronze, silicon brass, nickel silver, copper alloys such as nickel bronze, nickel manganese (D nickel), nickel-aluminum (Z nickel), nickel -Silicon, monel metal, constantan, nichrome inconel, nickel alloys such as Hastelloy.

Further, with respect to the aluminum-based metal, pure aluminum, aluminum oxide, Al--Cu based,
Al-Si system, Al-Mg system and Al-Cu-Ni-
Aluminum alloys for casting or wrought such as Mg-based, Al-Si-Cu-Ni-Mg-based alloys, high-strength aluminum alloys, and corrosion-resistant aluminum alloys can be used.

Further or as the iron-based metal, pure iron, iron oxide, carbon steel, Ni steel, Cr steel, Ni-Cr steel, Cr-
Mo steel, Ni-Cr-Mo steel, stainless steel, silicon steel, permalloy, insensitive magnetic steel, magnet steel, cast iron, etc. can be used. Further, a metal surface coated with another reflective metal, for example, an aluminum-plated steel plate, a zinc-nickel-plated steel plate, a zinc-aluminum steel plate, or the like coated with another metal by a permeation method or a thermal spraying method may be used.

Further, for the purpose of preventing metal corrosion and the like within a range where the reflectance of the metal surface is not lowered, electroplating, hot dipping, chromizing, siliconizing, calorizing, sheradizing, thermal spraying, etc. are performed on the metal surface. To coat other metals, to form a phosphate film by phosphate treatment, to form metal oxides by anodic oxidation or heat oxidation, and to adhere to a substrate that has been subjected to electrochemical corrosion protection it can.

Further, for the purpose of further improving the adhesiveness, the surface of the metal substrate may be subjected to chemical conversion treatment with phosphate, sulfuric acid, chromic acid, oxalic acid or the like.

Further, in the case of the above-mentioned aluminum or aluminum alloy base material, caustic soda, oxalic acid, sulfuric acid are used for the purpose of preventing corrosion, hardening the surface, improving adhesion, etc., within the range where the reflectance of the surface is not lowered. It is also possible to use the one in which an oxide film is formed by performing anodic oxidation using chromic acid (alumite), or the one to which the above-mentioned surface treatment is applied.

In particular, when obtaining a structure for the purpose of reflecting heat, those having infrared reflectance of 70% or more, preferably 80% or more, particularly preferably 90% or more are selected from these metals. Aluminum metal, stainless steel,
Aluminum hot-dip steel, or those that have been subjected to a surface treatment such as brightening to give a metallic luster are preferable. Especially for applications requiring heat resistance and corrosion resistance, stainless steel or the above surface treatment is applied. Materials are particularly preferred.

In addition to metals, glass-based materials,
Materials such as mirrors that are laminated with highly reflective metals on glass by vapor deposition, silicon-based materials (single crystal silicon,
Polycrystalline silicon, amorphous silicon, etc. can also be used.

In the structure of the present invention, it is necessary that the above-mentioned fluoropolymer-containing layer and the above-mentioned substrate are sufficiently adhered. The required adhesive strength depends on the application, the site of use and the environment of use, but if the adhesive strength can be measured, it is 0.5 kgf / cm or more, preferably 1.0 kgf / cm or more in the 90-degree peeling test with respect to the substrate. Particularly preferably 1.5 kg
Those having an adhesive strength of f / cm are preferable. If it is difficult to measure the peel strength directly, for example, JIS K
90/1 in the cross-cut test of the coated plate specified in 5400
Adhesion of at least 00 squares (initial adhesion), and adhesion even after 100 cycles of abrasion resistance test under a load of 250 g / cm ² using a rubbing tester (abrasive resistance) ), It is preferable that any one or more, and preferably all, of the conditions such as contact for 10 hours or more (durability) in a hot water immersion test at 95 ° C. or higher are satisfied.

In order to maintain the reflectance of the heat energy of the substrate and to bond the substrate and the fluoropolymer layer to each other to obtain a structure having a high reflectance of the heat energy, the substrate and the fluoropolymer layer are bound with a binder. It is preferable to adhere directly without using a layer or the like.

As a method thereof, it is preferable to introduce a functional group that contributes to the adhesion to the substrate into the molecular structure of the fluoropolymer used in the fluoropolymer layer.

The functional group that contributes to the adhesion to the substrate is a hydroxyl group, a carboxyl group or a carboxylate,
A sulfonic acid group or a sulfonic acid salt, an epoxy group, a cyano group and the like are preferable, and those containing at least one of these at the molecular end or side chain of the fluoropolymer are preferable. Of these, hydroxyl groups are preferable because they have good heat resistance and can be directly and strongly adhered to the substrate without lowering the reflectance.

Specifically, the fluorine-containing polymer having a functional group comprises (a) 0.05 to 50 mol% of at least one monomer selected from the ethylenic monomers having any of the above functional groups ( b) A fluorine-containing polymer obtained by copolymerizing 50 to 99.95 mol% of the above-mentioned fluorine-containing ethylenic monomer having no functional group is preferable.

The ethylenic monomer (a) having the above functional group is at least one kind of fluorine-containing ethylenic monomer having any of the above functional groups,
It is preferable in that the heat resistance, non-adhesiveness, and adhesion to the substrate of the layer comprising the fluoropolymer are not deteriorated.

The functional group-containing fluorine-containing ethylenic monomer (a), which is one of the components constituting this fluorine-containing polymer (functional group-containing fluorine-containing ethylenic polymer), has the formula (2): CX _{2 ^{= CX 1 -R f 2 -Y (}} 2) ( wherein, Y is -CH ₂ OH, -COOH, carboxylate, -SO ₃ H, sulfonate, an epoxy group or -C
N, X and X ¹ are the same or different and each is a hydrogen atom or a fluorine atom, R _f ² is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms, a fluorine-containing oxyalkylene group having 1 to 40 carbon atoms, and 1 carbon atom. It represents a fluorine-containing alkylene group having an ether group of 40 to 40 or a fluorine-containing oxyalkylene group having an ether bond having 1 to 40 carbon atoms).

Specific examples of the functional group-containing fluorinated ethylenic monomer (a) include formula (3): CF ₂ ═CF—R _f ³ —Y (3) [wherein Y is a formula (3) Same as Y in 2), R _f ³ has 1 to 4 carbon atoms
A divalent fluorine-containing alkylene group of 0 or OR _f ⁴ (R _f ⁴ is a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms or a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms) ], Formula (4): CF ₂ ═CFCF ₂ —OR _f ⁵ —Y (4) [In the formula, Y is the same as Y in Formula (2), R _f ⁵ has 1 to 3 carbon atoms.
A divalent fluorine-containing alkylene group having 9 or 1 to 39 carbon atoms
Represents a divalent fluorine-containing alkylene group containing an ether bond], formula (5): CH ₂ ═CFCF ₂ —R _f ⁶ —Y (5) [wherein Y is the same as Y in formula (2), R _f ⁶ has 1 to 3 carbon atoms
Or a divalent fluorine-containing alkylene group of 9 or OR _f ⁷ (R _f ⁷
Represents a divalent fluorine-containing alkylene group having 1 to 39 carbon atoms or a divalent fluorine-containing alkylene group having 1 to 39 carbon atoms and an ether bond], or the formula (6): CF ₂ ═CH—R _f ^8- Y (6) [In the formula, Y is the same as Y in the formula (2), R _f ⁸ has 1 to 4 carbon atoms.
And a divalent fluorine-containing alkylene group of 0].

The functional group-containing fluorine-containing ethylenic monomer of the formulas (3) to (6) has relatively good copolymerizability with the fluorine-containing ethylenic monomer (b) having no functional group. However, it is preferable because the heat resistance of the polymer obtained by copolymerization is not significantly lowered.

Among these, from the viewpoint of copolymerizability with the fluorine-containing ethylenic monomer (b) having no functional group and heat resistance of the obtained polymer, the formula (3) and the formula (5) Compounds of formula (5) are preferred, and compounds of formula (5) are particularly preferred.

More specifically, the functional group-containing fluorine-containing ethylenic monomer represented by the formula (3) will be described in more detail.

[0061]

[Chemical 1]

And the like.

As the functional group-containing fluorine monomer represented by the formula (4),

[0064]

[Chemical 2]

Examples are as follows.

As the functional group-containing fluorine monomer represented by the formula (5),

[0067]

[Chemical 3]

Examples are:

As the functional group-containing fluorine monomer represented by the formula (6),

[0070]

[Chemical 4]

Examples are as follows.

Other

[0073]

[Chemical 5]

And the like.

The content of the functional group-containing fluorine-containing ethylenic monomer (a) in the functional group-containing fluorine-containing ethylenic polymer is 0.05 to 50 mol% of the total amount of the monomers in the polymer. is there. It is appropriately selected according to the difference in the surface of the base material used for the structure, type, shape, coating method, conditions, purpose, application, etc., but preferably 0.05 to 20 mol%, particularly preferably 0.1 to 10 mol %.

When the content of the monomer (a) is less than 0.05 mol%, it is difficult to obtain sufficient adhesiveness to the surface of the base material, and peeling is likely to occur due to temperature change or penetration of chemicals. . Further, if it exceeds 50 mol%, the heat resistance is lowered, and adhesion failure, coloring, foaming, pinholes, etc. occur during firing at high temperature or use at high temperature, which lowers the reflection efficiency of heat energy. It is easy to peel the layer made of fluoropolymer and to elute the thermal decomposition products.

The fluorine-containing ethylenic monomer (b) which does not contain a functional group and which is copolymerized with the functional group-containing fluorine-containing ethylenic monomer (a) can be appropriately selected from known monomers. It imparts properties, chemical resistance, non-adhesiveness, antifouling properties, and low friction to fluoropolymers.

Specific fluorinated ethylenic monomer (b)
Is tetrafluoroethylene, formula (1): CF ₂
= CFR _f [R _f is CF ₃ or OR _f ¹ (R _f ¹ has ¹ carbon atom
~ 5 perfluoroalkyl group), chlorotrifluoroethylene, vinylidene fluoride, vinyl fluoride, hexafluoroisobutene,

[0079]

[Chemical 6]

(Wherein, X ² is selected from hydrogen atom, chlorine atom or fluorine atom, n is an integer of 1 to 5) and the like.

In addition to the functional group-containing fluorine-containing ethylenic monomer (a) and the functional group-free fluorine-containing ethylenic monomer (b), heat resistance and non-adhesiveness are not reduced. You may copolymerize the ethylenic monomer which does not have a fluorine atom in the range. In this case, the ethylenic monomer having no fluorine atom has 5 carbon atoms in order not to lower the heat resistance.
It is preferable to select from the following ethylenic monomers, and specific examples include ethylene, propylene, 1-butene, and 2-butene.

The fluorine-containing monomer (b) can be selected from the above examples so that the fluorine-containing polymer used in the structure of the present invention can be bonded to the heat resistance, melting point and contact angle of water of the obtained layer. In particular, the fluorine-containing monomer is used so that the monomer composition excluding (a) becomes the composition such as (1) PTFE, (2) PFA, perfluoro copolymer represented by FEP, and (3) ETFE. It is preferable to select the monomer (b) and copolymerize it with (a). In addition to the excellent properties of the above-mentioned fluoropolymers of (1) to (3), adhesion to a substrate is imparted. can do.

The fluoropolymer used in the structure of the present invention can be obtained by (co) polymerizing the monomers constituting the polymer by a conventional polymerization method. Among them, the method using a radical copolymer is mainly used. That is, the means for initiating the polymerization is not particularly limited as long as it can proceed radically, but is initiated by, for example, an organic or inorganic radical polymerization initiator, heat, light or ionizing radiation. The type of polymerization is also solution polymerization,
Bulk polymerization, suspension polymerization, emulsion polymerization, etc. can be used. The molecular weight is the concentration of the monomer used for the polymerization,
It is controlled by the concentration of the polymerization initiator, the concentration of the chain transfer agent, and the temperature. The composition of the resulting copolymer can be controlled by the composition of the charged monomers.

Further, as a result of earnest studies, the present inventors have found that
It is possible to adhere the above-mentioned fluoropolymer layer (thin film) to a substrate, and as a result, a structure in which a fluoropolymer layer having a specific thickness is directly adhered to the substrate is It has been found to be effective in reducing energy loss.

That is, in the structure of the present invention, the layer made of the fluoropolymer preferably has a thickness of 0.01 to 5 μm. If the thickness of the fluoropolymer layer is too large, thermal energy such as radiant heat, radiant heat, and infrared rays will be lost when passing through the fluoropolymer layer, and the thermal reflectance of the structure will be reduced. . If the layer of the fluoropolymer is too thin, the non-adhesiveness is insufficient, or even if it is sufficient, the abrasion resistance is poor and the non-adhesive durability is reduced. Further, the thickness of the layer made of the fluoropolymer is preferably 2 from the viewpoint of improving the heat energy transfer efficiency.
It is particularly preferable that the thickness is μm or less, and further 1 μm or less.

Regarding the preferred form (dispersion) of the fluoropolymer, in order to obtain the structure of the present invention, the fluoropolymer may be applied to the substrate in any form. Alternatively, it is used in the form of a surface treatment agent) or a film. Among them, the method of coating the base material in the form of paint is preferable because the thin film fluoropolymer layer can be efficiently formed on the base material as described above. It is difficult to uniformly adhere a layer made of a fluoropolymer to a substrate as a thin film having a thickness of 5 μm or less, particularly 2 μm or less, by a method in which the fluoropolymer is molded into a film form and applied.

When applied to a substrate in the form of a coating (or a surface treatment agent) to obtain the structure of the present invention, an aqueous dispersion of a fluoropolymer, an organic solvent dispersion, a powder, an organosol or an organosol is prepared. It may take the form of an aqueous dispersion or the like. Above all, it is preferable to use a form of an aqueous dispersion composition in which fine particles of a fluoropolymer are dispersed in water, because a layer of the fluoropolymer can be formed uniformly on a substrate, particularly in a thin film.

In this aqueous dispersibility, a surfactant for improving the dispersion stability of fine particles may be blended. Further, addition of a defoaming agent, a viscosity modifier, a leveling agent, etc. within a range that does not reduce the transparency or infrared transmittance of the fluoropolymer layer when formed into a structure, non-adhesiveness, or heat resistance. You may add an agent.

Regarding the fluoropolymer in the aqueous dispersion composition, the above-mentioned fluoropolymer has a particle size of 0.01 to 1.0 μm.
In order to form a layer of the fluoropolymer more uniformly and as a thin film on the substrate, the particle size is preferably 0.3 μm or less, particularly 0.1 μm.
It is preferably m or less.

The content of the fluoropolymer in the aqueous dispersion composition is selected in the range of 1 to 70%, and it is generally suitable for forming the above thin film depending on the viscosity of the composition and the coating method. Is adjusted.

The aqueous dispersion can be produced by various methods. Specifically, for example: -a method of finely pulverizing a powder of a fluoropolymer having a functional group obtained by a suspension polymerization method, and uniformly dispersing it in an aqueous dispersion medium with a surfactant, -emulsification Examples include a method of producing a fluorine-containing aqueous dispersion simultaneously with polymerization by a polymerization method, and further adding a surfactant or an additive as necessary. However, productivity and quality (small particle size, uniform powder) A method of directly producing an aqueous dispersion by an emulsion polymerization method is preferable.

The coating method is not particularly limited, and ordinary coating methods for paints such as brush coating, spraying, roll coating and flow coating can be employed. With the goal of thinning the film, dip coater, spin coater, gravure coater,
A curtain coater, an air doctor coater, a rod coater, a transfer roll coater, a reverse roll coater, etc. can be adopted. For example, after applying the above aqueous dispersion composition or the like by these methods, it is dried and, depending on the type of the fluoropolymer contained therein, by firing at a temperature not lower than the melting point of the fluoropolymer, a uniform fluoropolymer is obtained. The layers can be applied to the structure as thin films.

The structure of the present invention can have various shapes depending on the application. In order to obtain the structure of the present invention, the base material may be processed into a desired shape and then a layer made of a fluoropolymer may be formed. For example, a layer made of the fluoropolymer may be formed on a flat base material. Then, post-processing such as bending, pressing and drawing can be performed to obtain a desired shape.

The structure of the present invention obtained by the above method is
Provides excellent heat resistance, non-adhesiveness, antifouling property, chemical resistance, etc. while maintaining a small loss of heat energy due to transfer and transmission of heat energy such as radiant heat, radiant heat, infrared rays, etc. It is a structured structure that can maintain energy efficiency over a long period of time. Therefore, the structure of the present invention can be used in various applications as a reflection plate, and since it has a high efficiency of transfer and transfer of thermal energy such as radiant heat, radiant heat, and infrared rays, it can be used in various applications as a heat ray reflection plate. Can be used for

In order to use the structure of the present invention as a reflection plate and further as a heat ray reflection plate, the infrared reflectance of light passing through the layer of the fluoropolymer of the structure is 60% or more, more preferably 70% or more, particularly preferably It is preferably 80%.
Further, it is possible to achieve these infrared reflectances by using the structure of the present invention.

The heat ray reflector using the structure of the present invention has excellent heat resistance, non-adhesiveness, antifouling property, chemical resistance and heat energy such as radiant heat, radiant heat and infrared rays derived from the fluoropolymer. It can be applied to the following uses by utilizing the reflection efficiency of.

Heating cooker Electric oven, electric oven range, electric oven toaster, microwave oven, baking oven, gas oven, electromagnetic range, roaster, fish grill, gas grill,
Effective for preventing foods, oil stains, and scorching from adhering and being easy to remove by applying to the inner wall (for example, metal base material) and the inside surface of door (for example, glass base material part) of a cooking device such as an electric grill. In addition to the above, the good heat ray reflectivity can be used to uniformly transfer heat to the foodstuff with less loss, which effectively acts to shorten the cooking time and save energy.

Heating equipment By applying to a reflector of a heater of a heating equipment such as electric stoves, gas stoves, etc., it effectively prevents dust and dirt from adhering and is easy to remove, and has good heat ray reflection. It can effectively reduce the heating time and save energy by utilizing the characteristics.

The structure of the present invention can be used not only as the above-mentioned heat ray reflecting plate but also for the purpose requiring ultraviolet ray reflection and visible ray reflection. In addition, the structure of the present invention can be used for purposes other than the use of reflectivity by selecting a base material. For example, it can be effectively used as a heat absorbing plate by using a structure of a fluoropolymer and a base material having a high heat absorption property, and in applications using these.

[0100]

EXAMPLES Production Example 1 (Production of Aqueous Dispersion Containing PFA Having Hydroxyl Group) Pure water 1500 ml, ammonium perfluorooctanoate 13 in a 3 liter stainless steel autoclave equipped with a stirrer, a valve, a pressure gauge and a thermometer. Put 0.5g,
After thoroughly replacing with nitrogen gas, make a vacuum, and ethane gas 2
0 ml was charged.

Then, perfluoro- (1,1,9,9
-Tetrahydro-2,5-bistrifluoromethyl-
3,6-dioxa-8-nonenol) (formula (7))

[0102]

[Chemical 7]

[0103] 1.8 g of perfluoro (propyl vinyl ether) (PPVE) and 16.5 g of perfluoro (propyl vinyl ether) were introduced under pressure using nitrogen gas, and the temperature in the system was kept at 70 ° C.

While stirring, tetrafluoroethylene gas (TFE) was introduced under pressure so that the internal pressure was 8.5 kgf / cm ² G.

Then, a solution prepared by dissolving 0.15 g of ammonium persulfate in 5.0 g of water was injected with nitrogen to initiate the reaction. Since the pressure decreases with the progress of the polymerization reaction, tetrafluoroethylene gas was used to re-pressurize to 8.5 kgf / cm ² when the pressure dropped to 7.5 kgf / cm ² G, and pressure reduction and pressure increase were repeated.

While the supply of tetrafluoroethylene was continued, about 40% of tetrafluoroethylene gas was supplied from the start of polymerization.
Every time g is consumed, 1.9 g of the above-mentioned fluorine-containing ethylenic monomer having a hydroxy group (the compound represented by the formula (7)) is injected 9 times in total (17.1 g in total) to carry out polymerization. Continuing, about 4 tetrafluoroethylene from the start of polymerization
When 00 g was consumed, the supply was stopped, the autoclave was cooled, unreacted monomers were released, and 1950 g of a bluish translucent aqueous dispersion was obtained.

The concentration of the polymer in the obtained aqueous dispersion was 21.7%, and the particle diameter measured by the dynamic light scattering method was 74 nm.
Met. Further, a part of the obtained aqueous dispersion was frozen and coagulated, and the precipitated polymer was washed and dried to isolate a white solid. The composition of the obtained copolymer is ¹⁹ F-NM
By R analysis and IR analysis, TFE / PPVE / (fluorine-containing ethylenic monomer having hydroxyl group represented by formula (7)) was 98.0 / 1.0 / 1.0 mol%.

The infrared spectrum is 3620 to 3400.
Characteristic absorption of —OH was observed at cm ⁻¹ , Tm = 318 ° C. by DSC analysis, and I% thermal decomposition temperature Td = 379 ° C. by DTGA analysis.

Production Example 2 (PFA having a carboxyl group
Manufacture of Aqueous Dispersion Comprising) 1500 ml of pure water and 9.0 g of ammonium perfluorooctanoate were placed in the same autoclave as in Preparation Example 1, sufficiently replaced with nitrogen gas, and then evacuated to give an ethane gas of 20 m.
I was prepared.

Then, perfluoro- (9,9-dihydro-2,5-bistrifluoromethyl-3,6-dioxa-8-nonenoic acid) (formula (8):

[0111]

[Chemical 8]

1.8 g of nitrogen gas was introduced under pressure to keep the temperature of the system at 70 ° C. While stirring, tetrafluoroethylene (TFE) was injected under pressure so that the internal pressure was 8.5 kgf / cm ² G.

Then, a solution prepared by dissolving 0.15 g of ammonium persulfate in 5.0 g of water was injected with nitrogen to initiate the reaction. Since the pressure decreases as the polymerization reaction progresses, when the pressure decreased to 7.5 kgf / cm ² G, tetrafluoroethylene gas was used to repressurize the pressure to 8.5 kgf / cm ² G, and pressure reduction and pressure increase were repeated.

Every time 40 g of tetrafluoroethylene gas was consumed from the start of polymerization while continuing to supply tetrafluoroethylene, the above-mentioned fluorine-containing ethylenic monomer having a carboxyl group (compound represented by the formula (8)) Polymerization was continued by pressurizing 1.8 g three times in total (total 5.4 g), and when 160 g of tetrafluoroethylene was consumed from the start of polymerization, the supply was stopped and the autoclave was cooled to release the unreacted monomer. 1670 g of aqueous dispersion was obtained. The concentration of the polymer in the obtained aqueous dispersion is 10.0.
%, And the particle size was 79.0 nm.

A part of the aqueous dispersion was taken in the same manner as in Production Example 1 to isolate a white solid. A white solid obtained in the same manner was analyzed.

TFE / PPVE / (fluorine-containing monomer having a carboxyl group of the formula (8)) = 98.8 / 1.2 mol% Tm = 310 ° C. 1% thermal decomposition temperature Td = 313 ° C. Infrared The vector is -O at 3680-2800 cm ^-1
A characteristic absorption of C = 0 was observed at 1790 cm ⁻¹ in H.

Production Example 3 (Synthesis of Aqueous Dispersion of PFA Having No Functional Group) In Production Example 1, perfluoro- (1,1,9,9-
Tetrahydro-2,5-bistrifluoromethyl-
Aqueous dispersion of PFA containing no functional group, emulsion polymerization was carried out in the same manner as in Production Example 1 except that 3,6-dioxa-8-nonenol (compound represented by formula (7)) was not used. I got 1920g.

The concentration of polymer in the aqueous dispersion is 21.6.
%, And the particle size was 156 nm. A white solid was isolated and analyzed in the same manner as in Production Example 1.

TFE / PPVE = 99.3 / 0.7 mol% Tm = 317 ° C. 1% Pyrolysis temperature Td = 479 ° C. No characteristic absorption of —OH was observed in the infrared spectrum.

Production Example 4 (Preparation of Aqueous Dispersion for Paint) The aqueous dispersion of PFA having a hydroxyl group obtained in Production Example 1 was added to the nonionic surfactant Nonion HS-20.
8 was added so as to be 9.0% by weight with respect to the polymer weight of PFA having a hydroxyl group, and stirred uniformly.
The solution was concentrated to 40% polymer concentration.

Production Example 5 (PFA having a hydroxyl group
Synthesis of 1) Pure water 1500 in a 6 liter glass-lined autoclave equipped with stirrer, valve, pressure gauge, thermometer
Add ml and replace with nitrogen gas thoroughly, then evacuate,
1500 g of 1,2-dichloro-1,1,2,2-tetrafluoroethane (R-114) was charged.

Then, perfluoro- (1,1,9,9
-Tetrahydro-2,5-bistrifluoromethyl-
5.0 g of 3,6-dioxa-8-nonenol (compound represented by the formula (7)), 130 g of perfluoro (propyl vinyl ether) (PPVE), 180 of methanol
g was injected under pressure using nitrogen gas to keep the temperature in the system at 35 ° C.

While stirring, tetrafluoroethylene gas (TFE) was introduced under pressure so that the internal pressure would be 8.0 kgf / cm ² G. Then, 0.5 g of a 50% methanol solution of di-n-propylperoxydicarbonate was introduced under pressure using nitrogen to start the reaction. Since the pressure decreases with the progress of the polymerization reaction, when the pressure decreases to 7.5 kgf / cm ² G, tetrafluoroethylene gas gives 8.0.
The pressure was re-pressurized to kgf / cm ² , and pressure reduction and pressure increase were repeated.

While continuing the supply of tetrafluoroethylene, the amount of tetrafluoroethylene gas was about 60 from the start of the polymerization.
g Fluorine-containing ethylenic monomer having the hydroxy group each time it is consumed (compound represented by the formula (7))
The polymerization was continued by injecting 2.5 g of the product 9 times in total (22.5 g in total).
When g was consumed, the supply was stopped and the autoclave was cooled to release unreacted monomer and R-114.

The obtained polymer was washed with water and methanol, and then vacuum dried to obtain 710 g of a white solid. The composition of the obtained polymer is ¹⁹ F-NMR.
By analysis and IR analysis, it was TFE / PPVE / (fluorine-containing ethylenic monomer having hydroxy group represented by formula (7)) = 97.0 / 2.0 / 1.0 mol%. The infrared spectrum is -O at 3620-3400 cm ^-1 .
Characteristic absorption of H was observed. Tm = 3 by DSC analysis
05%, 1% thermal decomposition temperature Td = 37 by DTGA analysis
It was 5 ° C. 2m diameter using a high-performance flow tester
When the melt flow rate was measured at a temperature of 372 ° C. for 5 minutes with a load of 7 kgf / cm ² , the melt flow rate was 32 g / 10 min.

Production Example 6 (PFA having a hydroxyl group
Production of powder coating) The PFA powder having an hydroxyl group obtained in Production Example 5 (apparent specific gravity: 0.5, true specific gravity: 2.1, average particle size: 600 microns) was applied to a roller compactor (BCS manufactured by Shinto Kogyo Co., Ltd.).
-25 type) was compressed into a sheet having a width of 60 mm and a thickness of 5 mm. Next, it was crushed to a diameter of about 10 mm with a crusher, and further crushed with a crusher (Cosmomizer N-1 type manufactured by Nara Machinery Co., Ltd.) at room temperature at 11000 rpm. Next, a classifier (High Boulder 300SD type manufactured by Shin Tokyo Kikai Co., Ltd.)
The coarse powder having a size of 170 mesh (opening of 88 micron) or more was removed to obtain a PFA powder coating having a hydroxyl group. The apparent density of the powder was 0.7 g / ml, and the average particle size was 20 μm.

Production Example 7 (PFA having a hydroxyl group
Production of film by extrusion) Using the white solid obtained in Production Example 4 with a twin-screw extruder (Labo Plastomill manufactured by Toyo Seiki Co., Ltd.), 350 to 370 ° C.
Was extruded to prepare pellets. The pellets were extruded by a single screw extruder (Labo Plastomill, Toyo Seiki Co., Ltd.) at a temperature of 360 ° C. to 380 ° C. and a roll temperature of 120 ° C. to obtain a film having a width of 10 cm and a thickness of 50 μm.

Production Example 8 Butyl acetate 250 was placed in a 1-liter stainless steel autoclave equipped with a stirrer, a valve, a pressure gauge and a thermometer.
g, vinyl pivalate (VPi) 36.4 g, 4-hydroxyl butyl vinyl ether (HBVE) 32.5 g as a fluorine-free hydroxyl group-containing monomer,
4.0 g of isopropoxycarbonyl peroxide was charged, cooled to 0 ° C. with ice, filled with nitrogen gas and replaced with vacuum, and 47.5 g of isobutylene (IB) and 142 g of tetrafluoroethylene (TFE) were charged.

While stirring, the mixture was heated to 40 ° C. and reacted for 30 hours, and the reaction was stopped when the internal pressure of the reaction vessel dropped to 2.0 kg / cm ² or less. When the autoclave was cooled and unreacted gas monomer was released, a butyl acetate solution of a fluoropolymer was obtained. The polymer concentration was 45%.

From the obtained butyl acetate solution of the fluoropolymer, the fluoropolymer was taken out by the reprecipitation method, and was sufficiently reduced in pressure and dried to be isolated as a white solid. ^{When the} fluorine-containing polymer obtained by ¹ H-NMR and ¹⁹ F-NMR elemental analysis was analyzed, TFE / IB
The copolymer was / VPi / HBVE = 44/34/15/7 mol. The 1% thermal decomposition temperature by DTGA analysis was 220 ° C., and there was no crystalline melting point by DSC analysis.

Example 1 (1) Pretreatment of Base Material A pure aluminum plate (A1050P) of 150 × 35 × 0.5 (mm) (thickness 0.5 mm) was used to degrease with acetone.

(2) Coating (Tip Method) The above aluminum plate was dipped in the aqueous dispersion of the hydroxyl group-containing PFA obtained in Production Example 1 and the pulling rate was 30 mm /
It was pulled up at min to form a wet coating film.

(3) Firing of the wet coating film obtained by baking (2) at room temperature and 380 ° C.
And baked for 15 minutes to obtain a structure having a layer made of a fluoropolymer as a thin coating on aluminum.

(4) Evaluation Observation of Thickness of Fluorine-Containing Polymer Layer The film thickness of the fluorine-containing polymer layer was measured with an AFM device (Seiko Denshi KK SPI3800).

Measurement of Infrared Transmittance of Layer Containing Fluorine-Containing Polymer A part of the structure obtained in the above (3) was cut and immersed in 5% dilute hydrochloric acid to completely dissolve an aluminum plate to form a film-like coating (fluorine-containing film). The polymer layer) was isolated. The obtained coating is 400-4000 cm ^-1 with FT-IR equipment.
The average transmittance in the range was measured.

Contact angle with water The contact angle with water of the surface of the structure obtained in (3) was measured with a contact angle meter at room temperature.

Abrasion resistance test Using a rabin tester (manufactured by Ohira Rika Kogyo Co., Ltd.), a cotton cloth (A
BEMCOT (registered trademark) M-3 manufactured by SAHI CHEMICAL was used to measure the contact angle with water after rubbing the surface of the structure 1,000 times with a load of 250 g / cm ² .

Heat resistance test The above structure was placed in a hot air dryer set at 300 ° C. for 1
After 00 hours, it was taken out, cooled to room temperature, and the contact angle with water was measured.

Hot Water Resistance Test After immersing the above structure in hot water at 98 ° C. for 100 hours,
The appearance change was observed. If there was no further change, the contact angle with water was measured.

The measurement results of are shown in Table 1.

Example 2 The pulling rate was 30 mm / min to 100 mm / mi.
A hydroxyl group-containing PFA-aluminum structure was prepared and evaluated in the same manner as in Example 1 except that the coating speed was increased to n and dip coating was performed. The results are shown in Table 1.

Example 3 (1) Pretreatment of substrate The same procedure as in Example 1 was performed.

(2) Coating The aqueous dispersion for coating of hydroxyl group-containing PFA obtained in Production Example 4 was coated on an aluminum plate using a 10 mil applicator to obtain a wet coating film.

(3) Firing The wet coating film obtained in (2) was air-dried and then fired at 400 ° C. for 5 minutes to obtain a structure.

(4) Evaluation Evaluation was performed in the same manner as in Example 1 except that the film thickness of the coating film (layer made of fluoropolymer) was measured using an eddy current film thickness meter. The results are shown in Table 1.

Comparative Example 1 Instead of the hydroxyl group-containing PFA aqueous dispersion obtained in Preparation Example 1, the functional group-free PFA obtained in Preparation Example 3 was used.
Example 1 was repeated, except that the aqueous dispersion of
The structure was manufactured and evaluated. The results are shown in Table 1.

Comparative Example 2 (1) Pretreatment of substrate The same procedure as in Example 1 was performed.

(2) Coating (powder electrostatic coating) The PFA powder coating having hydroxyl groups obtained in Production Example 6 was applied to an electrostatic powder coating machine (GX3300 manufactured by Iwata Coating Co., Ltd.).
Type) and electrostatically applied at an applied voltage of 40 kV at room temperature.

(3) Firing The coated plate was baked at 330 ° C. for 15 minutes to obtain a structure.

(4) Evaluation The same procedure as in Example 3 was performed.

Comparative Example 3 (1) Pretreatment of substrate The same procedure as in Example 1 was performed.

(2) Coating The fluoropolymer (45% butyl acetate solution) obtained in Production Example 8 was diluted with butyl acetate to a polymer concentration of 20%. The 20% solution was applied to an aluminum plate using a 10 mil applicator.

(3) Firing The coated plate obtained in (2) was fired at 120 ° C. for 15 minutes to obtain a structure.

(4) Evaluation The same procedure as in Example 3 was performed.

Comparative Example 4 Only the infrared transmittance of the 50 μm film of the hydroxyl group-containing PFA obtained in Production Example 7 was measured in the same manner as in Example 1 and the results are shown in Table 1.

Comparative Example 5 (1) Pretreatment of substrate The same procedure as in Example 1 was performed.

(2) Coating On the above aluminum plate, a primer for fluororesin coating (manufactured by Daikin Industries, Ltd., Polyflon TFE Enamel E)
K1959DGN) was applied by spraying and baked at 100 ° C. for 10 minutes. On top of that, PFA powder coating (manufactured by Daikin Industries, Ltd., NEOFLON PFA powder coating, ACX-3)
Using 1), electrostatic coating was performed in the same manner as in Comparative Example 2.

(3) Firing It was baked at 380 ° C. for 20 minutes.

(4) Results When the primer was applied, the coated plate turned brown and did not have transparency. As a result, the aluminum plate itself completely lost its luster, and the layer made of the fluoropolymer did not have the desired infrared transmittance and the structure had no reflectivity at all.

[0160]

[Table 1]

Examples 4 to 6 (1) Pretreatment of substrate Using a SUS430 bright anneal plate, after degreasing of toluene, washing with acetone, and washing with water, an alkaline mixed bath (NaCO ₃
Dip it in 60 g / liter + NaOH 20 g / liter),
After degreasing for 20 minutes, it was washed with pure water and dried.

(2) Coating, (3) Firing Example 4 was the same as Example 1, Example 5 was the same as Example 2, and Example 6 was Example 3 except that the above-mentioned substrate was used.
Application and firing were performed in the same manner as in 1. to obtain a structure.

(4) Measurement of Evaluation Coating Thickness Examples 4 and 5 are the same as Example 1, and Example 6 is Example 3.
I went the same way.

The contact angle with water, the abrasion resistance test, the hot water resistance test and the hot water resistance test were carried out in the same manner as in Example 1.

Measurement of Infrared Reflectance (i) An FTIR apparatus 1760X (manufactured by Perkin Elmer) was equipped with a regular reflection apparatus, and the reflectance at an incident angle of 45 degrees with respect to the test plate was measured in air. 4000-400
The integrated average reflectance in the cm ⁻¹ range was measured by the relative reflectance using an aluminum vapor deposition plate as a standard.

(Ii) FTIR device IFS-120HR
A specular reflection device was attached to (manufactured by Bruker), and the reflectance at an incident angle of 11 degrees was measured in vacuum. 4000-400 cm ^-1
The integrated average reflectance in the range was measured by the relative reflectance using a gold vapor deposition plate as a standard.

The results are shown in Table 2.

Comparative Example 6 Comparative Example 1 except that the SUS plate described in Example 4 was used as the base material.
A structure was produced in the same manner as in 1. and the obtained structure was evaluated in the same manner as in Example 4. The results are shown in Table 2.

Comparative Example 7 Comparative Example 2 except that the SUS plate described in Example 4 was used as the base material.
A structure was produced in the same manner as in 1. and the obtained structure was evaluated in the same manner as in Example 3. The results are shown in Table 2.

Comparative Example 8 The infrared reflectance of the SUS plate pretreated in the same manner as in Example 4 was measured in the same manner as in Example 4. The results are shown in Table 2.

[0171]

[Table 2]

[0172]

According to the present invention, a structure capable of reflecting heat and having heat resistance, non-adhesiveness, antifouling property, chemical resistance, weather resistance and the like can be obtained without impairing reflection efficiency. be able to.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiro Kumegawa             Daiichi Nishiichitsuya 1-1, Settsu City, Osaka Prefecture             Yodogawa Manufacturing Co., Ltd. F-term (reference) 4F100 AB01A AB04A AB10A AK17B                       AT00A BA02 JA04B JB01                       JD10B JJ03B JK14B JL06                       JL09 JL13 JN06A YY00B

Claims (11)

[Claims] 1. A structure in which a base material and a fluoropolymer layer are directly adhered to each other without a binder, and the fluoropolymer layer has an infrared transmittance of 85% or more and a surface contact with water. A structure having an angle of 95 degrees or more, a 1% weight loss decomposition heat resistance temperature of a fluoropolymer of 300 ° C. or more, and a crystal melting point of 250 ° C. or more. 2. The structure according to claim 1, wherein the layer made of a fluoropolymer has an infrared transmittance of 95% or more. 3. The structure according to claim 1, wherein the layer made of the fluoropolymer has a thickness of 0.01 to 5 μm. 4. The thickness of the fluoropolymer layer is 2
The structure according to claim 3, which has a thickness of not more than μm. 5. The structure according to claim 1, wherein the surface of the layer comprising the fluoropolymer has a contact angle with water of 100 degrees or more. 6. The crystalline melting point of the fluoropolymer is 300 ° C.
It is above, The structure in any one of Claims 1-5. 7. The structure according to claim 1, wherein the base material is a metal plate having a high infrared reflectance. 8. The base material is made of a stainless material.
The described structure. 9. The structure according to claim 7, wherein the base material is made of an aluminum-based material. 10. A reflector comprising the structure according to claim 7. 11. A heat ray reflector comprising the structure according to any one of claims 7 to 9.