JPS6315850A - Decoration articles - Google Patents

Abstract

PURPOSE:To provide decorations articles which are composed of a specified plastic, has excellent water absorbing properties, thermal conductivity, touch and processability and can be colored, by kneading casein with a hydrated inorg. filler and water, molding the mixture, impregnating the molded product with formalin and curing it. CONSTITUTION:100pts.wt. casein (A) having a particle size of not larger than 100 mesh (e.g., rennet casein) is kneaded with 10-200pts.wt., pref 25-75pts.wt. hydorated inorg. filler (B) contg. water of crystallization or its hydrate (e.g., aluminum hydroxide), 10-40pts.wt. water (C) and optionally, 1-10pts.wt. pigment or acid dye, 1-50pts.wt. anhydrous inorg. filler (D). The mixture is left to stand at room temp. for 5-24hr and molded to obtain a molded product. The product is impregnated with 3-10wt% formalin (E) and cured to obtain a decorative product composed of a casein plastic contg. a hydrate inorg. filler. The decorative product is suitable for use as decoration articles such as eyeglass frame, watch belt, necklace, etc., which are used in contact with the human body.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to ornaments that often come into direct contact with the human body, such as eyeglass frames, watch panties, bracelets, and necklaces, and which contain a hydrous inorganic filler. By constructing decorative items from casein plastics, it also provides an immersive feel when worn.

[Prior art and intermediate points]

Conventionally, such ornaments have been made of resin such as celluloid and epoxy resin. Although such resin ornaments have the advantage of being able to be colored in any desired color and producing extremely colorful and beautiful products, they have the problem of poor feel to the wearer's body. this is,
This is because cetroid and epoxy resin have almost no water absorbency and do not absorb sweat at all, making them sticky and slippery.Furthermore, their thermal conductivity is low, so they feel lukewarm when they come into contact with the skin. This is for such reasons.

There are also decorative items made of metals such as gold alloys and stainless steel, but these have high thermal conductivity, so they feel cold when they come in contact with the skin, and have poor water absorption, so they become sticky when you sweat. In the evening, there is a problem that it feels sticky and becomes slippery.

[Means for solving problems]

Therefore, in this invention, by constructing the decorative item from casein plastic containing a hydrous inorganic filler,
I tried to solve the above problems.

The drawing shows an eyeglass frame as a specific example of the decorative article of the present invention. This eyeglass frame 1 includes a pair of rims 3゜3 connected to a bridge 2, and these rims 3,
A pair of temples 4.4 rotatably locked on the outside of 3.
and a pair of Krings 5, 5 attached to the inside of the rim 3.3, and of these members, the Klings 5.5 and the resin-coated portions 6, 6 of the saddle portions of the temples 4.4, It is composed of casein plastic containing a hydrous inorganic filler.

The casein plastics containing a water-containing inorganic filler herein are plastics obtained by kneading casein and a water-containing inorganic filler with water, molding the mixture, and then impregnating it in formalin and hardening it.

Casein used in this invention belongs to phosphoproteins,
A mixture of proteins that are similar to each other (complex protein)
s>, and the molecular weight is 75.0 flO ~ 375.000
It is estimated that milk contains about 3 tres and human milk contains about 1 td. Among these, the one obtained by coagulating milk with the enzyme rennin is called rennet casein, and the one obtained by coagulating it with acid is called acid casein. Particularly suitable is the use of rennet casein. Also,
For casein, it is necessary to use a fine powder that is preferably pulverized to less than 100 mesh; coarse particles are disadvantageous because they will not be mixed uniformly with the filler.

Examples of the hydrous inorganic filler include glacial alonium oxide or alumina hydrate, calcium sulfate hydrate, hydrated silicic acid, calcium hydroxide, magnesium hydroxide, basic magnesium carbonate, hydrated aluminum silicate,
Magnesium silicate, hydrated silicic acid, etc. are used. These water-containing inorganic fillers include those that themselves have water of crystallization and those that become hydrated with water, and their water-containing properties improve the hydrophilicity of casei/compounds. Thermal conductivity can be improved even by adding a small amount.

These hydrous inorganic fillers are added at a ratio of 10 to 200 parts by weight, preferably 25 to 75 parts by weight, per 100 parts by weight of casein. If it is less than 10 parts by weight, the addition effect will not be sufficient, and if it exceeds 200 parts by weight, molding will become impossible and the physical properties will deteriorate significantly.

In addition to water-containing inorganic fillers, casein contains casein 10
1 to 10 parts by weight of pigments such as titanium oxide] or acid dyes to adjust the color of the sea bream, and calcium 11-phosphate, silicon dioxide, alumina to increase the hardness of the molded product. 1 to 50 parts by weight, preferably 5 to 20 parts by weight of non-hydrous inorganic fillers such as calcium carbonate and barium sulfate can be added.

The above mixture is added at 10 to 4 parts by weight per 100 parts by weight of casein.
00 to 40 parts by weight are kneaded using a crusher or the like.

After this cross-mixing, it is preferable to leave the mixture at room temperature for about 5 to 24 hours to swell the casein, thereby improving the subsequent moldability.

Next, the mixture is molded, and the molding can be performed by a method such as pressing after pressing or pressing. Extrusion molding is performed at a pressure of about 10 to 20 MPa and at a temperature of 20 to 100°C.
This is done by creating an increasing temperature gradient from the base of the cylinder of the extruder to the die within a temperature range of about In addition, press molding
Preferably the pressure is 10-20 MPa and the temperature is 85-95°C.
It is carried out under a range of conditions.

Next, this molded body is immersed in formalin having a concentration of 3 to 10% by weight-M at around room temperature to harden the casein. The soaking time varies depending on the size of the molded body, but for example, for a plate-shaped pigeon coop, 6 days for a 3cm thick pigeon, 16 days for a 5 pigeon coop, 1011
11 for about 50 days.

This molded cured product is then washed in warm water to completely remove excess formalin, dried at a temperature in the range of 20 to 45°C, and further processed by cutting, cutting, polishing, etc. Krings 5 of the above glasses frame 1
, 5 and the resin-coated portion 6.6 of the temple 4.4.

The casein plastic containing the water-containing inorganic filler obtained in this way is (a) 10 when put in water at 25°C for 24 hours.
It has a high water absorption capacity of about 100%, so it absorbs sweat well and quickly.

(b) Thermal conductivity is moderate, so when it comes into contact with the human body, it does not feel cold or lukewarm.

P→ Free coloring and patterning can be achieved by changing the composition and ratio of pigments and dyes during or after molding, or by post-dying with dyes.

2) Dimensional stability throughout dry and wet conditions (high hardness).

(E) Excellent chemical resistance and does not cause whitening of hair styling products.
stomach.

It has the following characteristics.

Therefore, the eyeglass frame 1 does not become easily slippery due to sweat or become uncomfortable to wear due to sweat and stickiness. In addition, the resin-coated portion 6.6 of TEMP/l/4°4 does not whiten due to adhesion of hair styling products, and furthermore, the thermal conductivity is appropriate, so it feels good when worn.

Further, the upper part of the lips 3, 3 of the glasses frame 1, which corresponds to the eyebrows, may be made of this casein plastic.
The entire frame 1 may be manufactured 12 using this.

In addition, it can be used on the inside part of the watch band that comes in contact with the human body, or on the whole part, or on the side or back cover of the watch, and both have excellent sweat absorption properties, making them comfortable to wear. 1 will be given.

Furthermore, this casein plastic containing a hydrous pyrotechnic filler has good workability and can be processed into complex shapes, and can be engraved with appropriate engravings or colored differently in the recesses of the engravings. Bracelets and necklaces can be dyed or dyed.

Also suitable for use as accessories such as earrings and brooches.

〔Example〕

Rennet casein (particle size: 150-250 mesh)
100 parts by weight Aluminum hydroxide 50 parts by weight Titanium oxide 5 parts by weight Water
After thorough mixing in a crusher containing 30 parts by weight of upper ingredients, the casein was swollen by being loaded with Ili at room temperature for 12 hours. This mixture was filled into a mold and molded using a heat press machine at 95°C and 5 MPa, and then immersed in a 5-thiformer-11 solution to harden it. A molded body was obtained. When the properties of this molded body were measured, the following results were obtained: Specific gravity: 1.58 Hardness: 70-80° (20°C, 160°C RH, Rockwell 6 degree, M scale) Water absorption: 6-80° 10 inches (immersed in 25℃ water for 24 hours) Bending strength 70-80 MPa Thermal conductivity 0.5 Kcal/m, hr, 'C Static friction coefficient 02-(1,25 (25℃, 35 inches RH1)
Compatible material: deerskin) Compressive strength 300-400MPa After immersing this molded body in water at 25°C for 24 hours,
When left for 24 hours at 65%RH, the moisture content was 7 to 8.
It had decreased considerably. From this, it can be seen that the absorbed moisture such as sweat evaporates after being left for about 12 hours.

In addition, when we processed this molded product and used it in the resin contact parts of the glasses frames and temples, we found that the slippage due to sweat was much less than that of conventional celluloid, and the glasses were less prone to slipping when stepped on. was successfully prevented.

〔Effect of the invention〕

As explained above, since the decorative article of the present invention is made of casein plastic containing a hydrous inorganic filler, it has high water absorption, absorbs sweat and other moisture well, and prevents slipping due to sweat. Moreover, since the thermal conductivity is moderate, there is no discomfort when wearing it, and a good wearing feeling can be obtained. In addition, it is easy to process and can be colored freely, so
It has excellent decorative properties and can be made into ornaments with beautiful colors and patterns.

[Brief explanation of the drawing]

The drawing is a perspective view showing an eyeglass frame as a specific example of the decorative article of the present invention.

Claims (1)

[Claims] Decorative articles made of casein plastics containing hydrous inorganic fillers.