JP6695053B2 - Melamine resin molding material for microwave oven-compatible tableware and microwave oven-compatible tableware - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a melamine resin molding material for microwave oven-compatible tableware used as a molding material for producing tableware that can be heated by a microwave oven, and a microwave oven-compatible tableware manufactured using the same.

  Ceramics and polyethylene terephthalate (PET) resin are used as typical materials for producing microwave oven-compatible tableware. However, ceramics have the drawback that they are easily damaged and that PET resin molding materials are difficult to be colored.

  On the other hand, a melamine resin is known as a material that does not have the above-mentioned drawbacks. The melamine resin molding material has high hardness, can be freely colored, and is excellent in water resistance, chemical resistance and the like, and can be suitably used for tableware.

  Conventionally, as a melamine resin molding material for producing tableware, one prepared by containing powder pulp has been used (for example, Patent Document 1). A melamine resin molding material containing cotton powder as a reinforcing material has also been proposed (for example, Patent Document 2).

Japanese Patent Laid-Open No. 2000-129083 Japanese Patent No. 3815346

  However, the tableware produced by the conventional melamine resin molding material has a high ratio of the melamine resin, so that the heat resistance is insufficient, durability against heating in a microwave oven is low, and cracks may occur.

  Therefore, as in Patent Document 1, a method of lowering the ratio of the melamine resin by adding a large amount of powder pulp may be considered. However, powdered pulp easily absorbs water. Therefore, when tableware made of a melamine resin molding material containing powder pulp is heated in a microwave oven, water absorbed by the powder pulp is heated and evaporated, which causes cracks in the tableware.

  Further, Patent Document 2 attempts to solve the above-mentioned problems by using cotton powder, but it has not reached the overall characteristics including durability such as microwave oven high frequency suitability.

  The present invention has been made in view of the above points, particularly excellent microwave oven high-frequency suitability, and satisfying the overall characteristics required for microwave oven-compatible tableware melamine resin molding material for tableware And it aims at providing the tableware corresponding to a microwave oven.

The microwave oven-compatible tableware melamine resin molding material according to the present invention,
Melamine resin,
A filler,
Silicone elastomer,
Containing
The content of the silicone elastomer is 1 to 29.5 mass% with respect to the entire melamine resin molding material for tableware compatible with a microwave oven.

  It is preferable that the melamine resin contains a melamine resin cured product powder.

  It is preferable that the content of the melamine resin cured product powder is 4 to 15 mass% with respect to the entire melamine resin molding material for tableware compatible with a microwave oven.

  The silicone elastomer is in the form of powder, and the average particle size of the powder is preferably 1 μm or more and 10 μm or less.

The microwave-compatible tableware according to the present invention,
It is characterized by being a molded product of the melamine resin molding material for microwave oven-compatible tableware.

The microwave-compatible tableware according to the present invention,
The microwave oven-compatible tableware melamine resin molding material molded article, microwave oven-compatible tableware, the microwave oven-compatible tableware, at least the melamine base portion constituting the shape of the tableware, on the surface of this melamine base portion. It is preferable that the content of the silicone elastomer in the melamine base portion is 1% by mass or more and 29.5% by mass or less.

  According to the present invention, it is possible to satisfy the overall characteristics required for microwave oven-compatible tableware.

FIG. 1 is a chart obtained by analyzing a cross section of Conventional Example 1 (molded product having a silicone elastomer content of 0 mass% and a melamine cured product powder content of 0 mass%) by FT-IR. FIG. 2 is a chart obtained by analyzing the cross section of Example 8 (molded product having a silicone elastomer content of 24.3% by mass and a melamine cured product powder content of 19.4% by mass) by FT-IR. Is. FIG. 3 is a chart in which the chart (dotted line) shown in FIG. 1 and the chart (solid line) shown in FIG. 2 are overwritten. FIG. 4 is a graph showing the difference in transmittance between Conventional Example 1 and Example 8. FIG. 5 is a graph in which the transmittance difference (solid line) shown in FIG. 4 and the chart (dotted line) obtained by analyzing the silicone elastomer alone by FT-IR are overwritten.

  Embodiments of the present invention will be described below.

  The melamine resin molding material for tableware corresponding to the microwave oven of the present embodiment (hereinafter also simply referred to as “melamine resin molding material”) contains a melamine resin, a filler, and a silicone elastomer. Among the molded products, the melamine resin molding material is particularly suitable for use in producing microwave oven-compatible tableware.

  The melamine resin is a synthetic resin obtained by polycondensing methylolmelamine obtained by the reaction of melamine and formaldehyde under alkaline conditions. The molar ratio of formaldehyde to melamine is, for example, 1.2-3. Specific examples of the melamine resin, methylol melamine resin, methylol melamine-phenol co-condensation resin, methylol melamine-urea co-condensation resin, methylol melamine-epoxy co-condensation resin, powdered melamine formaldehyde condensation polymerization resin (e.g. "CP9012" manufactured by Panasonic Corporation can be mentioned.

  The content of the melamine resin is preferably in the range of 63 to 70 mass% with respect to the total mass (100 mass%) of the melamine resin, the filler and the silicone elastomer. Within this range, the content of unreacted melamine resin remaining in the molded product can be reduced, and it becomes possible to suppress the generation of condensed water when the molded product is heated by a microwave oven. It is possible to prevent the occurrence of cracks due to condensed water.

  The melamine resin preferably contains a melamine resin cured product powder. That is, it is preferable that the melamine resin contains both the melamine resin cured product powder and the uncured melamine resin. The melamine resin cured product powder can be obtained by heating an uncured melamine resin to cure it and pulverizing a cured product obtained. If the melamine resin is composed of only uncured melamine resin, condensed water generated during molding may remain in the molded product as it is. However, when a part of the melamine resin is the melamine resin cured product powder, it is possible to reduce the amount of condensed water generated during molding, and further suppress the occurrence of cracks in the molded product during heating by a microwave oven. be able to.

The content of the melamine resin cured product powder is preferably in the range of 4 to 15 mass% with respect to the entire melamine resin molding material for tableware for microwave oven (100 mass%). When the content of the cured melamine resin powder is 5% by mass or more, the content of the uncured melamine resin can be relatively reduced and the generation of condensed water can be suppressed. When the content of the melamine resin cured product powder is 15% by mass or less, the amount of uncured melamine resin required for producing a molded product can be secured.

  The filler includes an organic filler and an inorganic filler. Powdered cellulose can be mentioned as a specific example of the organic filler. Specific examples of the inorganic filler include barium sulfate. The melamine resin molding material may contain both an organic filler and an inorganic filler, or may contain only one of them.

  The silicone elastomer is a cross-linked polymer in which a silicone polymer is formed into a three-dimensional network, and for example, an elastomer powder obtained by cross-linking dimethyl polysiloxane can be used. Silicone elastomers are superior in water resistance, steam resistance, and heat resistance as compared with general rubber and other elastomers, and are therefore useful as tableware materials. In particular, silicone elastomers used for skin care and makeup cosmetics are excellent in press moldability and fluidity of powder, and it is useful to use these silicone elastomers used for skin care and makeup cosmetics in this embodiment. is there.

  The content of the silicone elastomer is in the range of 1 to 29.5 mass% with respect to the whole melamine resin molding material for tableware for microwave oven (100 mass%). Thus, by containing the above-mentioned content of the silicone elastomer in the melamine resin molding material, the microwave oven high frequency suitability, moldability, heat resistance, impact resistance, and discoloration resistance of the molded product are improved. Can be made. Especially for microwave microwave high frequency suitability, for example, when heating the molded product with a rated high frequency output of 750 W in a microwave oven and measuring the heating time until cracks occur in the molded product, this heating time is 170 seconds or more. If so, it can be said that microwave oven high frequency suitability has improved. Further, if the melamine resin molding material contains the melamine resin cured product powder, the heating time is 300 seconds or more, and the microwave oven high-frequency suitability of the molded product is further improved, which is preferable.

  If the content of the silicone elastomer is less than 1% by mass with respect to the entire melamine resin molding material for microwave oven-compatible tableware, the effect of adding the silicone elastomer may be low, and the microwave oven-adequacy of microwave oven-compatible tableware may be poor. It may have a lower effect. Further, when the content of the silicone elastomer exceeds 29.5% by mass with respect to the entire melamine resin molding material for tableware compatible with a microwave oven, it may be difficult to mold it into a desired shape, resulting in low moldability. There is a possibility that it will affect the price, such as the molded article (tableware for microwave oven) becoming expensive.

  The content of the silicone elastomer contained in the microwave-compatible tableware melamine resin molding material is preferably 5% by mass or more, and more preferably 10% by mass or more, based on the total amount of the microwave-compatible tableware melamine resin molding material. By doing so, it is possible to enhance the microwave oven high frequency suitability of the microwave oven-compatible tableware. Further, when the microwave oven high frequency suitability is affected by the size, shape, design, etc. of the tableware to be used, it is desirable to increase the content of the silicone elastomer relative to the total amount of the melamine resin molding material for the tableware compatible with the microwave oven.

  The silicone elastomer is preferably in the form of powder. The average particle size of the powder of the silicone elastomer is preferably 1 μm or more and 10 μm or less. Further, the powder of the silicone elastomer is an aggregate of a large number of particles, but the shape of each particle may be spherical or irregular. A silicone elastomer powder having an average particle size of less than 1 μm is expensive and may have low dispersibility in a melamine resin molding material. If the average particle size of the powder of the silicone elastomer exceeds 10 μm, it may affect the appearance and the like of the microwave oven-compatible tableware. Incidentally, the average particle size of the powder of the silicone elastomer is measured by a measuring method using a laser beam used for measuring the particle size of the ceramic powder or the like, a measuring method by an image analysis method based on an electron micrograph, etc. It may be selected appropriately. By using a powdered silicone elastomer, the dispersibility in the entire melamine resin composition can be improved. The shape of the particles forming the silicone elastomer powder may be spherical or amorphous, and may be selected depending on the application.

  The powder of the silicone elastomer preferably has a bulk specific gravity of 0.05 or more and 0.50 or less, and more preferably 0.1 or more and 0.3 or less. If the bulk specific gravity of the powder of the silicone elastomer is 0.05 or less, the handling property may be affected. If the bulk specific gravity of the silicone elastomer powder exceeds 0.50, the dispersibility may be affected. The true specific gravity of the silicone elastomer powder is preferably 0.90 or more and 1.10 or less, and more preferably 0.95 or more and 1.05 or less. The silicone elastomer powder having a true specific gravity of less than 0.90 or more than 1.10 may contain an additive that affects the dielectric constant. JIS Z 8807 may be used as the method for measuring the bulk specific gravity and true specific gravity of the silicone elastomer. It is desirable to use a white silicone elastomer (whiteness of 90% or more according to JIS Z8715). A silicone elastomer having a whiteness of less than 90% may affect the pattern of microwave oven-compatible tableware.

  The melamine resin molding material may further contain other additives as long as the effects of the present invention are not impaired. Specific examples of the additive include a curing agent (for example, phthalic anhydride), a release agent (for example, zinc stearate), and a plasticizer.

  The melamine resin molding material can be manufactured as follows. First, the melamine resin, the filler, the silicone elastomer and, if necessary, the additive are blended, and this is crushed by a ball mill and uniformly mixed. Next, the mixture is formed into a sheet by using a roll, and the obtained sheet is pulverized to obtain the powdery or granular melamine resin molding material. Alternatively, the melamine resin molding material in the form of powder can be obtained by heating and kneading the above mixture with a kneader or roll, cooling and solidifying, and crushing the obtained solidified product with a crusher.

  The microwave oven-compatible tableware of the present embodiment can be manufactured by molding the melamine resin molding material obtained as described above by, for example, compression molding. Since the microwave oven-compatible tableware is formed of the melamine resin molding material, it is particularly excellent in microwave oven high-frequency suitability, and the overall characteristics generally required for microwave oven-compatible tableware (for example, moldability, Heat resistance, impact resistance, and discoloration resistance) can be satisfied.

  In addition, the content of the silicone elastomer contained in the microwave-compatible tableware is preferably 1% by mass or more and 29.5% by mass or less with respect to the entire microwave-compatible tableware. If it exceeds 29.5% by mass, the microwave oven-compatible tableware may be expensive. If the content of the silicone elastomer contained in the microwave-compatible tableware is less than 1% by mass, the microwave-compatible tableware may have an adverse effect on the microwave oven compatibility and heat resistance.

  Note that discoloration during heating may be a problem depending on the application, cooking method, washing method, drying temperature, etc. of microwave oven-compatible tableware. In such a case, the melamine resin-forming material for microwave oven-compatible tableware itself may be colored in advance so that discoloration of heated tableware or the like is not noticeable. In order to make visually unnoticeable discoloration of tableware or the like due to repeated heating, it is sufficient to color the melamine resin forming material for microwave oven-compatible tableware itself. To color the melamine resin forming material for tableware itself, a commercially available coloring material can be used.

  As described above, the melamine resin-forming material for microwave-compatible tableware of the present embodiment is suitable for forming a tableware shape and a melamine base portion that constitutes a main structure of the tableware, in addition to forming a microwave-compatible tableware. For example, the melamine resin forming material for microwave oven-compatible tableware of the present embodiment is used to form a melamine base portion that constitutes the main part of the tableware and the shape of the tableware, and the surface of this melamine base portion is conventionally used. You may form the painting part by the printing paper like this. Further, by forming a glaze layer (or a glaze part) used in general melamine tableware so as to cover the melamine base part and the painting part, the surface quality of the tableware can be improved. As described above, the microwave oven-compatible tableware created by using the melamine resin forming material for microwave oven-compatible tableware of the present embodiment is combined with a conventionally used painting part, glaze part, etc. according to its application. Easy to match.

  In addition to previously coloring the melamine resin-forming material for microwave oven-compatible tableware itself, it is also useful to color the glaze layer or the like formed on the surface of the molded product (melamine base portion), if necessary. Further, it is also useful to use painting paper or the like together if necessary. When painting with printing paper, etc., if the content of carbon components etc. contained in the printing paper etc. (for example, conductive carbon) is high, in a microwave oven, high frequency is concentrated on these components etc. and the temperature rises, Cracks or discoloration may occur in the molded product. Therefore, when painting with printing paper is also used, it is useful to select a coloring agent, ink, or the like contained in the printing paper or the painting portion of the printing paper that does not affect the heating by the microwave oven.

  Hereinafter, the present invention will be specifically described with reference to examples. Regarding the melamine resin molding material of the present invention, Table 1 mainly evaluates the microwave oven property in experimental tableware, and Table 2 mainly evaluates the heat resistance of the color plate in the 150 ° C. oven.

(Melamine resin molding material)
As the melamine resin, those other than the melamine resin cured product powder (melamine formaldehyde polycondensation resin, "CP9013" manufactured by Panasonic Corporation) and the melamine resin cured product powder were used. The melamine resin cured product powder was prepared as follows. Formaldehyde (40% formalin, 2157 g) and NaOH (0.25 g) are added to melamine (2400 g), and after addition and condensation reaction at 95 ° C. for 50 minutes, the pressure is reduced to 8 kPa and heated with steam at 200 ° C. for dehydration under reduced pressure. As a result, a solid melamine resin was obtained. The melamine resin cured product powder was obtained by pulverizing the melamine resin with a ball mill for 10 hours.

  As the filler, an organic filler (powdered cellulose, “KC Flock” manufactured by Nippon Paper Industries Co., Ltd.) and an inorganic filler (barium sulfate, manufactured by Sakai Chemical Industry Co., Ltd.) were used.

  “EP-2601” manufactured by Toray Dow Corning Co., Ltd. was used as the silicone elastomer. The form of this silicone elastomer is powder, the average particle size is 2 μm, and the bulk specific gravity is 0.1 (apparent specific gravity is 0.1 g / mL).

  As additives, a curing agent (phthalic anhydride, manufactured by Toho Chemical Industry Co., Ltd.), a release agent (zinc stearate), and a plasticizer were used.

  The above-mentioned melamine resin, filler, silicone elastomer and additive were compounded in the compounding amounts shown in Table 1, which were pulverized with a ball mill for 2 hours and uniformly mixed. Next, this mixture was heated and kneaded with a kneader, then cooled and solidified, and the obtained solidified product was pulverized by a pulverizer to obtain a melamine resin molding material.

(Test tableware)
The melamine resin molding material obtained as described above was compression-molded under the conditions of a temperature of 160 ° C., a pressure of 20 MPa and a molding time of 90 minutes to produce a plate having a diameter of 120 mm as a tableware for test.

(Moldability test)
During compression molding of test tableware, those with no abnormal appearance were marked with "○", those with abnormal appearance that did not pose a practical problem were marked with "△", and abnormal appearance such as unfilled was found. The moldability was evaluated as "x".

(Microwave high frequency suitability test)
The test tableware was placed on the pan of the microwave oven, heating was started at the rated high-frequency output of 750 W, and the heating time until cracks were generated in the test tableware was measured, and this was used as the microwave oven high-frequency suitability test.

(Discoloration resistance test in microwave oven)
After placing the test tableware on the saucer of the microwave oven and heating, the appearance of the test tableware was visually observed. "○" indicates that discoloration (yellowing) was not seen, "△" indicates that discoloration (yellowing) was not problematic for practical use, and discoloration (yellowing) was noticeable The discoloration resistance was evaluated as "x".

  Table 1 shows the above test results.

  As is clear from Table 1, Examples 1 to 9 are excellent in microwave frequency high-frequency suitability and satisfy the overall characteristics (formability, discoloration resistance, etc.) required for other microwave oven-compatible tableware. Was confirmed.

  In particular, in Examples 5 to 9 in which the cured melamine resin powder was used, it was confirmed that the microwave oven high frequency suitability was further excellent as compared with Examples 1 to 4.

  On the other hand, in Conventional Example 1, since the silicone elastomer was not used, it was confirmed that the microwave oven high frequency suitability was poor.

  Further, in Example 1 (the amount of silicone elastomer added was 1.0% by mass), the moldability was ◯, but the microwave oven discoloration resistance was sometimes Δ. Similarly, in Example 9 (the addition amount of the silicone elastomer was 29.1% by mass), the moldability was sometimes from ◯ to Δ. Even if the moldability is Δ, the moldability may be improved to ◯ by optimizing the molding conditions. However, regarding moldability and microwave oven discoloration resistance, in addition to the shape of the tableware, it may be affected by the size and thickness of the tableware. In the experiments conducted by the inventors, the amount of silicone elastomer added was 1.0. Good results were obtained by adjusting the content to be not less than mass% and not more than 29.1 mass%. When the amount of silicone elastomer added is 30% by mass or more, the formability may be affected by Δ to × or the material cost may be increased depending on the shape of tableware or the like.

  It goes without saying that such formability depends on the shape of the tableware (such as a plate and a bowl) and the size thereof (diameter of the plate, wall thickness of the plate, etc.). Under these circumstances, in the experiments by the inventors, the content of the silicone elastomer was 1 to 29% by mass, further 4.9% by mass or more (rounded to 5% by mass or more), 25% by mass or less, and further 10% by mass. As described above, it has been found that by setting the content to 20% by mass or less, it is possible to handle various tableware while suppressing the material cost.

(Heat resistance test in 130 ° C oven)
The following heat resistance test was performed on the test tableware prepared in Examples 1 to 8, Conventional Example 1, and Comparative Example 1. The test tableware was placed in a thermostatic chamber (oven) equipped with an air agitator at 130 ° C., held for 2 hours as it was, and then the test tableware was taken out and cooled to room temperature. After that, when the appearance of the test tableware was visually observed, none of Examples 1 to 8, Conventional Example 1, and Comparative Example 1 was visually observed to be a defect that would cause a defect in use.

  Next, a color plate was prepared based on the composition of Example 8 used in Table 1, and a heat resistance test was performed in a 150 ° C. oven based on the color plate. Table 2 shows the results of the heat resistance test in the 150 ° C. oven. By using the color plate as the molded product, it is possible to suppress variations in the size, thickness, shape, etc. of the tableware that may occur when test tableware is used.

(Evaluation of discoloration in 150 ° C. oven)
A melamine resin molding material for a microwave oven compatible tableware of Example 8 and Conventional Example 1 was prepared. Example 8 has the composition shown in Table 1, and the content of the silicone elastomer is 24.3% by mass and the cured melamine powder is 19.4% by mass. In the formulation of Conventional Example 1, the content of the silicone elastomer is 0% by mass and the melamine cured product powder is 0% by mass. Other configurations of Example 8 and Conventional Example 1 are similar to those of Example 1.

  Using the strip-shaped color plates prepared from each of Example 8 and Conventional Example 1, the heat discoloration resistance in a commercially available oven was evaluated. The color plate was produced by using each of Example 8 and Conventional Example 1 to form a two-stage color plate of 120 mm × 80 mm × 3 mmt and 2 mmt by a 26-ton direct pressure press.

  This color plate was set in a thermostat of 150 ° C., the color plate was taken out every 24 hours from the start of the test, and the color difference was measured by a color difference meter (spectral color difference meter SE-6000 type / manufactured by Nippon Denshoku Industries Co., Ltd.). It was measured. Table 2 shows an example of measurement results in which the color plate before being set in the thermostat of 150 ° C. (before the test) was used as a reference (blank), and the degree of color change from this reference was used as the color difference. The color difference (ΔE) is defined by JIS Z 8730, JIS L 0809 and the like.

  From the results of Table 2, the color plate having a silicone elastomer content of 0 mass% and a melamine cured product powder of 0 mass% (Conventional Example 1) had a color difference of 12.4 after 24 hours from the start of the test and a color difference of 15 after 48 hours. It can be seen that the color difference becomes 18.6 after 0.0 and 100 hours, and the color changes at 150 ° C. On the other hand, in the color plate prepared from Example 8 in Table 2 (Example in which the content of the silicone elastomer is 24.3 mass% and the melamine cured product powder is 19.4 mass%), 24 hours after the start of the test, The color difference was 7.3, the color difference after 24 hours was 9.6, and the color difference after 100 hours was 13.1.

  As described above, the results in Table 2 show that the longer the heating time at 150 ° C., the greater the degree of color change (or color difference) in the color plate. It was also found that the color change at the time of heating can be made smaller as the content of the silicone elastomer is increased, the color change becomes larger as the heating temperature becomes higher, and the color change becomes larger as the heating time becomes longer. As described above, when the content of the silicone elastomer contained in the microwaveable melamine resin molding material for tableware is less than 1% by mass, the effect of reducing discoloration during heating of tableware or the like may be low. Further, when the content of the silicone elastomer contained in the melamine resin molding material for tableware exceeds 30% by mass, the product cost of tableware or the like may be affected.

As an example with a peripheral composition of Example 8 (content of silicone elastomer: 24.3% by mass, cured melamine powder: 19.4% by mass), the melamine cured product was increased by increasing the amount other than the cured melamine powder in Table 1. The same results as those shown in Table 1 and Table 2 were obtained also in the examples in which the powder was 0% by mass. Also, as a comparative example with the peripheral composition of Comparative Example 1, when the amount other than the melamine cured product powder is reduced and the melamine resin cured product powder is increased in Conventional Example 1 of Table 1, the results are the same as those shown in Table 1 and Table 2. Good results were obtained.

(Friere transform infrared spectroscopy analysis)
An FT-IR (Friere Infrared Spectroscopy) instrument can be used for analysis of the melamine resin molding material for tableware and the silicone elastomer contained in tableware molded using this melamine resin molding material for tableware. .. 1 to 5 are charts obtained by FT-IR analysis of a cross section of a molded article (tableware compatible with a microwave oven) molded using a melamine resin forming material for a tableware compatible with a microwave oven. 1 to 5, the horizontal axis represents Wavenumbers (wave number, unit: cm ⁻¹ ) and the vertical axis represents Transmittance (transmittance, unit:%).

  FIG. 1 is a chart obtained by analyzing the cross section of Conventional Example 1 (molded product having a silicone elastomer content of 0 mass% and a melamine cured product powder content of 0 mass%) by FT-IR.

  FIG. 2 is a chart obtained by analyzing the cross section of Example 8 (molded product having a silicone elastomer content of 24.3% by mass and a melamine cured product powder content of 19.4% by mass) by FT-IR. Is.

  FIG. 3 is a comparison of two FT-IR charts in which the chart (dotted line) shown in FIG. 1 and the chart (solid line) shown in FIG. 2 are overwritten, and when the Wavenumbers are 600, 800, 1100, 1300, It can be seen that the difference in transmittance is relatively large around 3000 or the like.

  FIG. 4 is a graph showing the difference in transmittance between Conventional Example 1 and Example 8. As is apparent from FIG. 4, it is understood that the difference in transmittance is relatively large in the case where Wavenumbers are around 600, 800, 1100, 1300, 3000.

  FIG. 5 is an overlay of the transmittance (spectrum) difference (solid line) shown in FIG. 4 and the chart (dotted line) obtained by analyzing the silicone elastomer alone by FT-IR. It can be seen from FIG. 5 that the peak of the difference in transmittance shown in FIG. 4 and the peak of the silicone elastomer alone (for example, the peaks near Wavenumbers of 600, 800, 1100, 1300, and 3000) overlap each other.

  By using the FT-IR device as described above, the presence or absence of the silicone elastomer contained in the melamine resin molding material for tableware and the silicone contained in the microwaveable tableware molded using this melamine resin molding material for microwave oven You can check the presence of elastomer. Further, depending on the FT-IR device used, the presence or absence of the silicone elastomer contained in the melamine resin molding material for microwave oven-compatible tableware and the microwave oven-compatible tableware molded using this melamine resin molding material for microwave oven-compatible tableware are included. The accuracy of measuring the content of the silicone elastomer may be low, but in this case, another analyzer may be used.

Claims (6)

A melamine resin molding material for tableware for microwave oven,
The melamine resin molding material for microwave oven tableware,
Melamine resin,
A filler,
Silicone elastomer,
Containing
The content of the silicone elastomer is 1 to 29.5 mass% with respect to the entire melamine resin molding material for tableware corresponding to the microwave oven,
Melamine resin molding material for tableware for microwave oven. Melamine resin cured product powder is contained in the melamine resin,
The melamine resin molding material for tableware according to claim 1. The content of the melamine resin cured product powder is 4 to 15 mass% with respect to the entire microwaveable melamine resin molding material for tableware,
A melamine resin molding material for microwave ovens according to claim 2.   The melamine resin molding material for tableware according to any one of claims 1 to 3, wherein the silicone elastomer is in the form of powder, and the average particle size of the powder is 1 µm or more and 10 µm or less. A molded article of the melamine resin molding material for tableware according to any one of claims 1 to 4,
Microwave-friendly tableware. A microwave oven-compatible tableware, which is a molded product of the melamine resin molding material for microwave oven-compatible tableware according to any one of claims 1 to 4,
The microwave-compatible tableware has at least a melamine base portion that forms the shape of the tableware, and a glaze portion formed on the surface of the melamine base portion,
The melamine base is formed of the microwave-compatible tableware melamine resin molding material,
Microwave-friendly tableware.

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