JP5135830B2 - Glass top plate for cooker - Google Patents

Description

  The present invention relates to a glass top plate for a cooker that is placed on top of the cooker.

  Conventionally, a top plate for a cooker made of a glass plate is installed on the top of a cooker such as an electromagnetic cooker or a gas cooker. On the top plate for a cooker, an object to be heated such as a pan is placed, and the object to be heated is heated by an induction heating coil that performs induction heating inside the cooker, or a heating device such as an electric heater or a halogen heater. I can cook. In particular, electromagnetic cookers tend to be increasingly demanded in recent years because of their high safety, and accordingly, the demand for top plates for cookers is also increasing.

  A sensor is pressed against the heating device side surface (back side surface) of the top plate for the cooker (Patent Document 1), a heat collecting plate to be attached to the temperature detecting means (Patent Document 2), or a vibration detecting means is attached. The cushioning rubber is arranged so that the coil holding plate for holding the coil and the glass top plate do not come into contact with each other (Patent Document 4), and the side surface of the heating device of the top plate and the parts are arranged. May come into contact.

When decoration is applied to the heating device side surface of the top plate for the cooker, if the heating device side surface of the top plate comes into contact with the parts as described above, the coating film strength of the decoration is remarkably reduced, and the appearance is improved. It may cause trouble.
In addition, when the side surface of the heating device is decorated, it may be damaged during assembling work of the top plate for a cooker or during service, resulting in trouble in appearance.
Therefore, it has been desired to establish a decoration technique in which the side surface of the heating device of the cooking device top plate is not easily wrinkled.

JP 2003-297540 A JP 2005-141962 A Japanese Patent Laid-Open No. 2003-77644 JP 2004-103445 A

  This invention is made in view of this conventional problem, Comprising: It aims at providing the glass top plate for cookers which has the decoration which is hard to be wrinkled on the heating apparatus side surface (back side surface of a glass top plate). is there.

The present invention is formed by laminating a painting layer on the back side opposite to the cooking surface in the substrate glass, and further laminating a heat-resistant sliding layer,
The heat-resistant sliding layer is obtained by dispersing a plate-like sliding material powder imparting slidability in a heat-resistant resin having heat resistance,
Sliding material powder have a layered crystal structure of hexagonal type, in a cooker glass top plate characterized by comprising from boron nitride (claim 1).
In addition, the said back side surface in substrate glass means the surface which faces the heating apparatus which is a surface opposite to the cooking surface which is a surface which puts a pan etc. when using a heating cooker.

As described above, the glass top plate for a cooking appliance is formed by laminating a painting layer on the back side of the substrate glass, and further dispersing a sliding material powder for imparting slidability to a heat-resistant resin having heat resistance. A heat-resistant sliding layer is laminated.
Therefore, the heat-resistant sliding layer has the effect of protecting the painting layer and the back side of the substrate glass due to the heat resistance and strength of the heat-resistant resin and the solid lubricity of the sliding material powder. it can.

As a result, even when the back plate comes into contact with a member or the like during assembly work or service of the cooker top plate, it becomes difficult to cause wrinkles and prevents wrinkles on the painting layer or the back side. be able to.
Thereby, according to this invention, the glass top plate for cookers which has the decoration which a wrinkle cannot stick easily to a heating apparatus side surface (back side surface of a glass top plate) can be obtained.

As described above, the glass top plate for a cooker according to the first invention is formed by laminating a painting layer on the back side surface of the substrate glass, and further laminating a heat-resistant sliding layer. A sliding material powder imparting slidability is dispersed in a heat-resistant resin having a property.
When the heat-resistant sliding layer does not use the heat-resistant resin, heat resistance and sufficient strength may not be obtained, and the painting layer formed on the back side of the substrate glass is likely to be wrinkled. . Moreover, when the said sliding material powder is not contained, there exists a problem that a lubricity is not acquired and a back surface tends to be wrinkled when a member contacts.
Therefore, as described above, the formation of the heat-resistant sliding layer is very effective for the glass top plate for a cooker.

The heat-resistant sliding layer can be formed, for example, by preparing a paste made of a heat-resistant resin, a sliding material powder, and an organic solvent, applying the paste on the painting layer, and performing a heat treatment.
In this case, in order to form a paste, for example, a coating method having excellent film formability such as a screen printing method can be performed.

  The sliding material powder preferably has a plate shape, and the size is an index of particle size D50 (laser diffraction / scattering particle size distribution measuring device, LA-910 measurement by HORIBA, the same applies hereinafter). It is preferable that it is 10-50 micrometers. In this case, further excellent slidability can be obtained.

Examples of the substrate glass include low expansion crystallized glass, tempered glass, and borosilicate glass.
The low-expansion crystallized glass contains, for example, transparent low-expansion crystallized glass, white low-expansion crystallized glass, and a coloring component, and exhibits black, brown having transparency, purple having transparency, and the like. There are colored glasses.

Further, various known layers can be applied to the painting layer. Specifically, for example, as described later, a layer composed of a raster color, a layer composed of a glass composition and an inorganic pigment, a layer composed of a pearl-like material and a silicone resin or a siliceous sol, and the like can be mentioned.
The painting layer may be formed by laminating the above-described layers alone on the back side surface, or may be formed by laminating a plurality of layers.

In the glass top plate for a cooking appliance, the sliding material powder is preferably one or more of graphite, boron nitride, and molybdenum disulfide .
In this case, the graphite, boron nitride, and molybdenum disulfide have a hexagonal layered crystal structure and have excellent solid lubricity. Therefore, in this case, a better protective effect can be obtained.
Further, since the boron nitride is an electrical insulator, it is effective to add the boron nitride to a portion where insulation is required.

The heat-resistant resin is preferably a silicone resin, a polyamide resin, a fluororesin, or a composite thereof (Claim 2 ).
The silicone resin, polyamide resin, and fluororesin are particularly excellent in heat resistance. Therefore, in this case, a better protective effect can be obtained.

Further, the refractory sliding layer preferably further contains an inorganic pigment (claim 3).
The said inorganic pigment can be contained in the range which does not inhibit the protective effect of the said heat-resistant sliding layer as needed. In this case, it can be colored and the hardness of the heat-resistant sliding layer can be improved.

Examples of the inorganic pigment include a white inorganic pigment, a black inorganic pigment, a gray inorganic pigment, a yellow inorganic pigment, a brown inorganic pigment, a green inorganic pigment, a blue inorganic pigment, a pink inorganic pigment, and a mica pigment.
Specifically, as the white inorganic pigment, for _{example, TiO 2, ZrO 2, ZrSiO} 4, Al 2 O 3, 3Al 2 O 3 -2SiO 2, Li 2 O · Al 2 O 3 · 8SiO 2 or the like can be mentioned It is done.

Examples of the black inorganic pigment include Cr-Fe-based oxides, Co-Mn-Cr-Fe-based oxides, Co-Ni-Cr-Fe-based oxides, and Co-Ni-Cr-Fe-Mn-based materials. An oxide etc. are mentioned.
Examples of the gray inorganic pigment include Sn-Sb-based oxides and Sn-Sb-V-based oxides.

Examples of the yellow inorganic pigment include Sn-V oxides, Zr-V oxides, Zr-Si-Pr oxides, Ti-Cr-Sb oxides, and the like.
Examples of the brown inorganic pigment include Zn-Al-Cr-Fe-based oxides and Zn-Mn-Al-Cr-Fe-based oxides.

Examples of the green inorganic pigment include Ca—Cr—Si oxides, Cr—Al oxides, Co—Zn—Al—Cr oxides, and Zr—Si—Pr—V oxides. It is done.
Examples of the blue powder include Co—Al—Zn-based oxides, Co—Al-based oxides, and Zr—Si-based oxides.

Examples of the pink inorganic pigment include Mn—Al oxides, Ca—Sn—Si—Cr oxides, Sn—Cr oxides, and Zr—Si—Fe oxides.
Examples of the mica pigment include Iriodin manufactured by Merck Co., Ltd.
These pigments can be mixed in an arbitrary ratio so as to obtain a desired color.

The heat-resistant sliding layer preferably contains 0.1 to 100 parts by weight of the sliding material powder as an outer shell when the total weight of inclusions other than the sliding material powder is 100. Claim 4 ).
In this case, since the lubricity of the sliding material powder can be obtained well without impairing the strength obtained from the heat-resistant resin, a more excellent protective effect can be obtained.
The total weight of inclusions other than the sliding material powder is the weight of the heat-resistant resin when the heat-resistant sliding layer does not contain the inorganic pigment, and when it contains the inorganic pigment, The total weight of resin and inorganic pigment.

  In the case where the content of the sliding material powder is less than 0.1 parts by weight on the outer surface of the sliding material powder when the total weight of inclusions other than the sliding material powder is 100, There is a possibility that sufficient lubricity due to the sliding material powder may not be obtained. On the other hand, when the content of the sliding material powder exceeds 100 parts by weight, the strength of the heat-resistant sliding layer may be reduced.

The heat-resistant sliding layer preferably contains 1 to 20 parts by weight of the sliding material powder as an outer shell when the total weight of inclusions other than the sliding material powder is 100. 5 ).
In this case, the heat-resistant sliding layer has sufficient strength, and an excellent protective effect can be obtained.

Further, the refractory sliding layer preferably has a thickness of 3～25Myuemu (claim 6).
When the thickness of the heat-resistant sliding layer is less than 3 μm, the above protective effect may not be sufficiently obtained. On the other hand, when the thickness of the heat-resistant sliding layer exceeds 25 μm, the protective effect is not improved, and the cost may be increased.

Moreover, it is preferable that the said painting layer has a layer which consists of a pearl tone material which consists of a pearl tone material and a silicone resin or a siliceous sol (Claim 7 ).
In this case, the designability can be improved without reducing the original strength of the substrate glass.

As the pearl tone material, it is preferable to use a material coated with an inorganic pigment with titanium oxide, zirconium oxide, iron oxide or the like. In addition, a specific iris color can be developed by changing the film thickness of titanium oxide, iron oxide, or the like.
The silicone resin is a polymer of an organosilicon compound having a siloxane bond as a main skeleton.

Moreover, as said siliceous sol, the silica sol obtained by hydrolyzing ethyl silicate etc., colloidal silica sol, etc. can be used, for example.
The layer composed of the above-mentioned pearl color paint may contain an inorganic pigment in the range of 20% by weight or less when the total content of the pearl color material and the silicone resin or siliceous sol is 100% by weight. good. The inorganic pigment described above can be used as the inorganic pigment.

The layer composed of the pearl-colored paint composed of the pearl-colored material and the silicone resin or the siliceous sol can be formed by applying the pearl-colored paint to the back side of the substrate glass and baking it at 700 to 900 ° C. preferable.
The application of the pearl color paint is preferably performed by screen printing.

Moreover, it is preferable that the said painting layer has a layer which consists of an inorganic pigment and a glass composition (Claim 8 ).
In this case, the design can be improved without reducing the original strength of the substrate glass.
The inorganic pigment described above can be used as the inorganic pigment.

The glass composition is preferably a lead-free glass composition in consideration of recyclability and the like.
Moreover, it is preferable that the said glass composition is 650 degrees C or less in a softening point. Further, the glass _{composition, SiO 2, Al 2 O 3} , B 2 O 3, Li 2 O, Na 2 O, K 2 O, and containing ZrO ₂ as an essential component, CaO optionally, SrO It is more preferable to use a lead-free glass composition that contains at least one of BaO, ZnO, and TiO ₂ as an additive component and that is welded by heat treatment at 750 to 900 ° C.

  To the glass composition, a low-expansion crystal forming agent, a crystallization agent, a melting agent, an adhesion improver, etc. are added for the purpose of further improving crystallinity, low expansion, mechanical strength, and adhesive strength. May be.

The low-expansion crystal-forming agent crystallizes the glass composition by firing to precipitate low-expansion crystals. As the low expansion crystal forming agent, for example, a Li ₂ O ₃ —Al ₂ O ₃ —SiO ₂ based low expansion crystal forming agent can be used.

Moreover, the layer which consists of the said inorganic pigment and a glass composition apply | coats the paste which consists of an inorganic pigment, a glass composition, and organic resin on the back side surface of the said board | substrate glass, and is baked at 700-900 degreeC. It is preferable to form.
The paste is preferably applied by screen printing.

Also, the painting layer preferably has a layer consisting of luster (claims 9).
The raster color is a diluted solution of an organometallic compound.
Examples of the raster colors include organic materials such as Au, Pt, Pd, Rh, Ru, Bi, Sn, Ni, Fe, Cr, Ti, Ca, Si, Ba, Sr, Mg, Ag, Zr, In, and Mn. A diluted solution of a metal compound can be mentioned. A plurality of these organometallic compound diluted solutions can be mixed at an arbitrary ratio.

The layer composed of the raster color is preferably formed by applying the raster color to the back side surface of the substrate glass and baking at 600 to 900 ° C.
Further, the application of the raster color is preferably performed by screen printing.

Further, the substrate glass is preferably linear thermal expansion coefficient of ^{-10 × 10 -7 ~80 × 10 -7} / K (at30~500 ℃) ( claim 10).
When the linear thermal expansion coefficient of the substrate glass deviates from the range of −10 to 80 × 10 ⁻⁷ / K (at 30 to 500 ° C.), it may not be suitable as a substrate glass used for a glass top plate for a cooker. .

Further, the substrate glass is preferably a transparent low-expansion crystallized glass plate as a main crystal β- quartz solid solution or β- spodumene (claim 11).
The transparent low expansion crystallized glass plate having the β-quartz solid solution or β-spodumene as the main crystal is particularly suitable as a substrate glass for a glass top plate for an electromagnetic cooker.

Moreover, it is preferable that the painting glass decoration layer which consists of a glass composition is formed in the cooking surface side of the glass top plate for cookers (Claim 12 ).
In this case, it is possible to prevent the cooking surface from being damaged by wear of the heated object such as a pan and the cooking surface of the glass top plate for a cooker, or to obtain an effect of making the heated object difficult to slip. it can.

Moreover, it is preferable that the said decoration glass decoration layer is 1-15 micrometers in film thickness. When the film thickness of the decorative glass decorative layer is less than 1 μm, the above-described effects may not be sufficiently obtained. On the other hand, when the film thickness of the said decorative glass decoration layer exceeds 15 micrometers, there exists a possibility that the said decorative glass decoration layer may peel.
The film thickness of the decorative glass decorative layer is more preferably 2 to 10 μm.

The glass composition is preferably a lead-free glass composition in consideration of recyclability and the like, and a glass composition similar to the glass composition used for the layer composed of the above-mentioned inorganic pigment and glass composition should be used. Is preferred.
The painted glass decorative layer may contain an inorganic pigment or the like in addition to the glass composition.
The inorganic pigment described above can be used as the inorganic pigment.

Moreover, it is preferable that the said decorating glass decoration layer is formed so that it may become an arbitrary pattern (Claim 13 ).
Examples of the arbitrary pattern include a stone shape, a line shape, and a solid having a certain area.

Example 1
In this example, as a reference example and an example of the glass top plate for a cooker of the present invention, a plurality of types of glass top plates (samples E1 to E10) for a cooker were produced. Sample E1 to Sample E5 are reference examples, and Sample E6 to Sample E10 are examples.
As shown in FIG. 1, the glass top plate 1 for a cooker of the present example is obtained by laminating a painting layer 3 on a back side surface 22 that is a surface opposite to the cooking surface 21 in the substrate glass 2, and further thereon. The heat-resistant sliding layer 4 is laminated.
This will be described in detail below.

As the substrate glass 2, transparent low expansion crystallized glass having a thermal expansion coefficient of −1.0 × 10 ⁻⁷ / K was used.
Moreover, as the paste for the painting layer 3, a paste containing 60% by weight of an inorganic pigment and 40% by weight of a glass composition and kneaded by adding 60% of an acrylic resin as an outer shell was prepared. This paste was diluted with an organic solvent such as butyl carbyl toluate acetate until the viscosity was easy to print.

Specifically, the inorganic pigment is first composed of 15.0 wt% Cr ₂ O ₃ , 45.0 wt% Fe ₂ O ₃ , 30.0 wt% Co ₃ O ₄ , and 5 wt%. NiO, 3.0 wt% Al ₂ O ₃ , and 2.0 wt% SiO ₂ were mixed to obtain a black raw material powder. The black raw material powder was calcined at 900 to 1000 ° C., pulverized and fired at 1200 to 1400 ° C., and further finely pulverized.

The glass composition contains 63 wt% SiO ₂ , 12 wt% Al ₂ O ₃ , 20 wt% B ₂ O ₃ , 5 wt% Li ₂ O and a softening point of 650 ° C. or less. A lead-free glass composition was used.

Next, as a paste for the heat-resistant sliding layer 4, a heat-resistant resin, an inorganic pigment, a sliding material powder, butyl carbitol acetate, etc. so that a heat-resistant sliding layer having the composition shown in Table 1 is finally obtained. A plurality of types of pastes each containing a predetermined amount were prepared.
The heat-resistant resin and the inorganic pigment were adjusted so that the total amount was 100% by weight, and the sliding material powder was added in an amount of 0.1 to 200% as an outer shell.

  As the heat-resistant resin, methyl silicone resin is used, and as the sliding material powder, it is scale-like, and the above-mentioned D50 index is 10 μm graphite, or the D50 index is 20 μm boron nitride. .

Next, a manufacturing method will be described.
First, the paste for the painting layer was applied to the entire back side 22 of the substrate glass 2 using a stainless steel 350 mesh screen, and baked at 820 ° C. Thereby, the painting layer 3 having a film thickness of 10 μm was formed.

Next, the paste for heat-resistant sliding layer was applied onto the painting layer 3 using a stainless steel 250 mesh screen, and baked at 300 ° C. Thereby, the heat-resistant sliding layer 4 with a film thickness of 10 μm was formed, and the glass top plate 1 (sample E1 to sample E10) for cookers was prepared.
Sample E1 to Sample E10 have heat-resistant sliding layers having the compositions shown in Table 1.
In the present example, the above-described two layers are formed on the entire back side surface 22 of the substrate glass 2, but may be a part.

(Comparative Example 1)
In this example, a glass top plate for a cooker (sample C1) was produced as a comparative example of the present invention.
This example is an example in which the heat-resistant sliding layer of Example 1 described above is changed to a layer made of only a heat-resistant resin without containing sliding material powder.
Others were performed in the same manner as in Example 1.

(Experimental example)
Next, an abrasion durability test using metal pieces was performed on the glass top plates for cooking devices (samples E1 to E10 and sample C1) produced in Example 1 and Comparative Example 1.
As the metal piece, as shown in FIG. 2, a galvanized steel sheet 5 was prepared by performing stamping and rounding the tip 51 to R3. The press punching direction is the A direction shown in the figure, and a burr 52 is formed at the tip 51.

As shown in FIG. 3, the wear durability test is performed with the back side surface 12 of the glass top plate 1 for a cooker facing upward, the surface with the burr 52 of the galvanized steel plate 5 facing upward, and the back side surface 12 and the tip 51 of the galvanized steel plate 5. The galvanized steel sheet 5 was reciprocated in a horizontal direction B with a width of 20 mm so that the contact angle α with the slab was 10 ° under a condition that the load F was 1 kg. Then, the number of reciprocations at which the heat resistant sliding layer 4 was damaged was examined, and the friction resistance was evaluated.
A case where the evaluation is ◎, ○, or △ is a pass, and a case where the evaluation is × is a failure. The results are shown in Table 1.

(Evaluation criteria)
A: When there is no damage even after exceeding 100 round trips.
◯: When damaged from 30 to 100 round trips.
Δ: Damage occurs after 10 to 30 reciprocations.
X: When damaged in less than 10 round trips.

As known from Table 1, Sample E1 to Sample E10 as reference examples and examples of the present invention showed good results.
In addition, Sample E1 to Sample E4 and Sample E6 to Sample E10 showed excellent results because the content of the sliding material powder was within the preferred range of the present invention.
Further, Sample E2 and Sample E3 showed more excellent results because the content of the sliding material powder was within the particularly preferable range of the present invention.

In this example, methyl silicone resin is used as the heat-resistant resin, but the same effect can be obtained by using various heat-resistant resins such as polyamide resin and fluorine resin.
In this example, the painting layer is a layer composed of an inorganic pigment and a glass composition. However, even if a painting layer other than this is formed, the protective effect of the heat-resistant sliding layer may be affected. The same effect can be obtained.

In addition, sample C1 as a comparative example of the present invention does not contain sliding material powder, so the heat-resistant sliding layer does not have lubricity and cannot provide a protective effect, so damage occurs once. It was a failure.
Thus, according to the present invention, it was possible to obtain a glass top plate for a cooker having a decoration that is difficult to be wrinkled on the side surface of the heating device (back side surface of the glass top plate).

Explanatory drawing which shows the glass top plate for cookers in Example 1. FIG. (A) Top view and (b) Side view showing a galvanized steel sheet in an experimental example. Explanatory drawing which shows the abrasion durability test in an experiment example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass top plate for cookers 2 Substrate glass 21 Cooking surface 22 Back side 3 Painting layer 4 Heat resistant sliding layer 41 Heat resistant resin 42 Sliding material powder

Claims (13)

On the back side, which is the opposite side of the cooking surface of the substrate glass, a painting layer is laminated, and further, a heat-resistant sliding layer is laminated,
The heat-resistant sliding layer is obtained by dispersing a plate-like sliding material powder imparting slidability in a heat-resistant resin having heat resistance,
Sliding material powder have a layered crystal structure of hexagonal type, cooker glass top plate characterized by comprising from boron nitride. 2. The glass top plate for a cooker according to claim 1, wherein the heat resistant resin is a silicone resin, a polyamide resin, a fluororesin, or a composite thereof. 3. The glass top plate for a cooker according to claim 1, wherein the heat resistant sliding layer further contains an inorganic pigment. The heat-resistant sliding layer according to any one of claims 1 to 3, wherein when the total weight of inclusions other than the sliding material powder is 100, the sliding material powder is 0.1 A glass top plate for a cooker, which contains ˜100 parts by weight. The heat-resistant sliding layer according to any one of claims 1 to 4, wherein the heat-resistant sliding layer has an outer covering of the sliding material powder of 1 to 20 when the total weight of inclusions other than the sliding material powder is 100. A glass top plate for a cooker, characterized by containing parts by weight. The glass top plate for a cooking device according to any one of claims 1 to 5, wherein the heat-resistant sliding layer has a thickness of 3 to 25 µm. The glass top plate for a cooking device according to any one of claims 1 to 6, wherein the painting layer has a layer made of a pearl tone paint made of a pearl tone material and a silicone resin or siliceous sol. The glass top plate for a cooker according to any one of claims 1 to 7, wherein the painting layer has a layer made of an inorganic pigment and a glass composition. 9. The glass top plate for a cooker according to claim 1, wherein the painting layer has a layer composed of a raster color. 10. The cooking according to claim 1, wherein the substrate glass has a linear thermal expansion coefficient of −10 × 10 ⁻⁷ to 80 × 10 ⁻⁷ / K (at 30 to 500 ° C.). Glass top plate for dexterity. The glass top plate for a cooking device according to any one of claims 1 to 10, wherein the substrate glass is a transparent low expansion crystallized glass plate having a β-quartz solid solution or β-spodumene as a main crystal. The glass top plate for a cooker according to any one of claims 1 to 11, wherein a decorative glass decorative layer made of a glass composition is formed on the cooking surface side of the glass top plate for a cooker. 13. The glass top plate for a cooker according to claim 12, wherein the decorative glass decorative layer is formed to have an arbitrary pattern.

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