JP2733551B2 - Tableware made of thermosetting resin and method for producing the same - Google Patents

Description

The present invention relates to a tableware made of a thermosetting resin such as a melamine resin,
And a method for producing the tableware.

2. Description of the Related Art As tableware made of plastic, tableware obtained by molding a melamine resin is known.

Melamine resin tableware does not heat up like metal tableware, does not break like ceramic tableware, and is not excessively heavy. Further, since melamine resin tableware has good heat resistance and a moderate feeling of weight, it can be said that it has excellent tableware suitability as compared with tableware made of thermoplastic resin such as polyolefin.

Problems to be Solved by the Invention Melamine resin tableware has the above-mentioned advantages, it is widely used for lunch, business use and portable tableware at one time, but it may be that residual formaldehyde is eluted. As a result, there is more negative effect on the image than the problem of whether or not residual formaldehyde is actually detected, and the spread of this tableware is suppressed.

In addition, tableware made of melamine resin has an essential problem that the color, smell and dirt of food are more easily adhered than tableware made of ceramics, and the dirt cannot be easily removed by washing. In particular, stains on curry and tea astringent are typical examples of those that are difficult to remove. In addition, when the food is cooked rice, if it is left after use, the dried matter firmly adheres to the tableware and becomes hard to fall off with washing.

Since the dishes are for serving dishes, the stains diminish the taste of the dishes. Also, if the dishes are easily soiled,
It is also disadvantageous in terms of labor for removing the dirt and the amount of detergent used. If friction is applied at the time of cleaning to remove dirt, the frictional scratch promotes the adhesion of the next dirt, resulting in a vicious cycle.

The present invention has been made in view of such a situation, and has an object to provide a melamine resin tableware that does not have the above-described problems.

Means for Solving the Problems A thermosetting resin tableware according to the present invention is a tableware (1) obtained by molding a thermosetting resin. (2) is formed.

Further, in the method for producing the thermosetting resin tableware of the present invention, the tableware (1) obtained by molding the thermosetting resin is brought into contact with a fluororesin dispersion liquid, and the surface of the tableware (1) is coated with a fluororesin. Characterized in that the impregnated carrier layer (2) is formed. In this case, it is particularly preferable to use a fluororesin dispersion containing a formaldehyde-scavenging compound.

 Hereinafter, the present invention will be described in detail.

The tableware (1) is obtained by molding a thermosetting resin such as a melamine resin, a guanamine resin, a urea resin, and a phenol resin, and the melamine resin is particularly important. As a molding method, a compression molding method, an injection molding method, or the like is employed.

The shape of the tableware (1) is arbitrary, including a bowl shape, a cup shape, a dish shape, a tray dish shape, and a lunch box shape.

In the present invention, the tableware (1) is brought into contact with a fluororesin dispersion to form a fluororesin-impregnated carrier layer (2) on the surface side of the tableware (1).

Here, examples of the fluorine-based resin include a homopolymer or copolymer of tetrafluoroethylene, a homopolymer or copolymer of vinylidene fluoride, and a homopolymer or copolymer of chlorotrifluoroethylene. Particularly, tetrafluoroethylene homopolymers and copolymers are important, and examples of the comonomer include olefins, fluorinated olefins, perfluoroolefins, and fluoroalkyl vinyl ethers.

The fluororesin dispersion is obtained by dispersing the above fluororesin in an appropriate solvent, and water is particularly important as the solvent. Wax, silicone oil, anionic, nonionic, etc.
It often contains a cationic / amphoteric surfactant, a pH adjuster, a solvent, a polyhydric alcohol, a softener, a viscosity adjuster, a Yonezawa agent, a stabilizer and the like.

In order to form the fluororesin-impregnated carrier layer (2) with the fluororesin dispersion on the tableware (1), it is preferable to immerse the tableware (1) in the fluororesin dispersion and contact the two. In some cases, means such as coating and spraying are also employed. The temperature condition at the time of contact is
A temperature of at most 100 ° C or less, usually from room temperature to about 80 ° C, is sufficient. When the contact is performed by immersion, it is preferable that the immersion operation is performed under a reduced pressure condition or a pressurized condition.

After the tableware (1) is brought into contact with the fluororesin dispersion, the fluororesin dispersion adhered to the tableware (1) is removed by washing or wiping, and dried under room temperature conditions or under heating conditions. . Thereby, the impregnated carrier layer (2) of the fluororesin with the fluororesin dispersion liquid is formed on the tableware (1).

When the tableware (1) is brought into contact with the fluororesin dispersion, it is particularly desirable to include a formaldehyde-trapping compound in the fluororesin dispersion, whereby the remaining formaldehyde is completely removed.

Examples of the formaldehyde-capturing compound include an adduct of glyoxal, glyoxylic acid, or glycolaldehyde and an acidic sulfite: a composition of the adduct and urea, ethylene urea, thiourea, or dicyandiamide: Enol tautomers; and the like.

An edible antistatic agent may be added to the fluororesin dispersion.

When the tableware (1) obtained by molding a thermosetting resin is brought into contact with a fluororesin dispersion, the fluororesin is impregnated not only on the surface of the tableware (1) but also on the inside of the surface side of the tableware (1). The carrier layer (2) is formed. The depth of the impregnated carrier layer (2) varies greatly depending on the contact conditions (temperature, time, pressure, etc.) between them, but it is several μm even under mild conditions, and several tens μm to several hundred μm if slightly strong conditions are used, and is somewhat strong. If the conditions are adopted, it will exceed 1000 μm.

The fluorinated resin-impregnated carrier layer (2) of the fluorinated resin dispersion makes it difficult for the food, color and smell to adhere to the tableware (1), and even if dirt adheres, it is easily removed by simple washing. This makes it possible to prevent the dried product from sticking even if the used tableware is left unattended, and also to have an effect of making it hard to be damaged due to mechanical friction at the time of handling or washing.

When the fluororesin dispersion contains a formaldehyde-trapping compound, the fluororesin dispersion has excellent penetration into the tableware (1), extraction power and anti-reattachment of the extract, and formaldehyde trapping. Tableware (1)
The residual formaldehyde is effectively removed not only from the surface but also from the inside of the surface side.

Even when an edible antistatic agent is added to the fluororesin dispersion, the effect is maintained since the antistatic agent is impregnated and supported on the inside of the surface of the tableware (1).

EXAMPLES Next, the present invention will be further described with reference to examples. Hereinafter, "parts" and "%" are expressed on a weight basis.

Example 1 Polytetrafluoroethylene fine particles 3%, dimethyl silicone oil 2%, perfluorocarbon solvent 5
%, Paraffin-based medium boiling point solvent 10%, fluorine-based surfactant 2%, polyoxyethylene-based nonionic surfactant 5%,
An aqueous fluororesin dispersion having a composition of 5% of stabilizer and 68% of water was prepared. Then, to 100 parts of this aqueous dispersion, 5 parts of a glyoxal-sodium acid sulfite 1: 2 adduct and 1 part of an edible antistatic agent were added and mixed.

The bowl-shaped melamine resin tableware (1) obtained by molding by a conventional method was immersed in the above-mentioned fluororesin aqueous dispersion containing the adduct heated to 40 to 45 ° C, and the pressure was reduced to about 300 Torr. The state was maintained for about 5 minutes, and once returned to normal pressure, the pressure was reduced again to the same degree of reduced pressure and maintained for about 5 minutes. After the system was returned to normal pressure, the tableware (1) was taken out, washed with warm water and then with normal temperature water, and dried at normal temperature to 40 ° C. This allows
Tableware (1) about 400μm thick with fluororesin dispersion
Was formed.

When the presence or absence of residual formaldehyde was measured for the tableware (1) subjected to the above treatment and the tableware (1) before the above treatment, no formaldehyde was detected in the former, whereas trace amounts of formaldehyde were detected in the latter. Was detected.

The untreated tableware (1) is compared with the case where the tableware (1) subjected to the above treatment and the tableware (1) before the above treatment are used for business use in tableware for curry and Japanese tea. Even after obvious soiling was observed, the treated tableware (1) was practically free of soiling.

Examples 2 to 6 Instead of glyoxal-sodium acid sulfite 1: 2 adduct, glyoxylic acid-sodium acid sulfite adduct (Example 2), glycolaldehyde-sodium acid sulfite adduct (Example 3), urea and glyoxal Example 1 was repeated except that a mixture with sodium acid sulfite 1: 1 adduct (Example 4), acetylacetone (Example 5) and methyl acetoacetate (Example 6) were used in 5 parts each. In this case, the same good results as in Example 1 were obtained.

Example 7 Example 1 was repeated except that the addition of the adduct and the antistatic agent to the aqueous fluororesin dispersion was omitted, and the impregnation was performed at normal pressure for about 15 minutes. Also in this case, as in Example 1, the adhesion of curry and Japanese tea to stains was good.

Effect of the Invention The use of the tableware of the present invention significantly reduces the color, smell and adhesion of foods, extremely reduces the adhesion of dried products, and significantly improves the scratch resistance. As a result, after using the tableware, cleaning can be achieved only by simple washing. This also contributes to the prevention of pollution by significantly reducing the amount of detergent used. The life of tableware is several times that of untreated tableware (for example, 4 to 5).
Times).

When the formaldehyde scavenging compound is contained in the fluororesin dispersion liquid, no residual formaldehyde is detected immediately after the production of the product tableware, and there is no danger of formaldehyde leaching from inside during use.

Even when an edible antistatic agent is added to the fluororesin dispersion, the effect is permanent, so that adhesion of dirt due to static electricity is effectively prevented. This is advantageous when a seller displays tableware in a store or when a customer stores tableware in a cupboard.

As described above, according to the present invention, the problems of tableware made of a thermosetting resin such as a melamine resin are completely eliminated, and the original advantages thereof can be used as they are, and therefore, the present invention has great utility.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-91177 (JP, A) JP-A-50-55630 (JP, A) JP-A-2-283747 (JP, A) 121173 (JP, U)

Claims (3)

(57) [Claims] 1. A thermosetting resin made by forming a fluororesin-impregnated carrier layer (2) with a fluororesin dispersion on the surface of a tableware (1) obtained by molding a thermosetting resin. Tableware. 2. A tableware (1) obtained by molding a thermosetting resin is brought into contact with a fluororesin dispersion to form a fluororesin-impregnated carrier layer (2) on the surface side of the tableware (1). A method for producing tableware made of thermosetting resin. 3. A tableware (1) obtained by molding a thermosetting resin is brought into contact with a fluorine-based resin dispersion containing a formaldehyde-trapping compound, and the surface side of the tableware (1) is impregnated with a fluorine-based resin-impregnated carrier layer. A method for producing tableware made of thermosetting resin, characterized by forming (2).