JPH076271B2 - Artificial marble - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to artificial marble.

[0002]

[Prior art and problems] In recent years, the demand for marble has been increasing with the increasing quality of buildings, but it is rarely produced in Japan and imported from foreign countries such as Spain, Italy, and Taiwan. There is. However, due to rising import costs from foreign countries and environmental damage, supply is gradually decreasing. Also, water absorption when bad natural marble is used for building materials,
Strength weaknesses are also becoming a problem.

Therefore, recently, artificial marble has been manufactured in place of natural marble. In artificial marble, natural ore, which is the main component, is adjusted to an appropriate particle size, and after thermosetting resin is adhered and solidified, the surface is usually polished into the final product. Compared with natural marble, artificial marble can adjust the surface pattern to some extent, and has high physical properties such as high strength, high durability, and high water resistance that natural marble does not have, and is excellent in productivity and cost. Therefore, the growth rate is expected to be around 30% in the future.

Generally, black artificial marble is produced by adding a large amount of carbon black to various natural stones and mixing it. However, it is difficult to obtain a black color tone, and it is much more difficult to produce a black artificial marble using only natural stones. unknown.

As a result of repeating experiments based on the above findings, the present inventor succeeded in producing a black artificial marble mainly composed of natural graphite silica (commonly known as silica black) produced in Kaminokuni-cho, Hokkaido. The present invention has been completed.

Therefore, an object of the present invention is to provide a black artificial marble containing natural graphite silica.

[0007]

[Means for Solving the Problems] The means of the present invention for achieving the above object is that natural graphite silica is solidified with a thermosetting resin.

[0008]

[Function] Due to the natural graphite silica, the color tone becomes black.

[0009]

【Example】

Example 1 Graphite silica produced in Kaminokuni Town, Hokkaido (commonly known as silica black, composition SiO ₂ 80.39%, Al ₂ O ₃ 5.
4%, C 3.02%, Fe ₂ O ₃ 1.4%, CaO
1,200 g of powder obtained by pulverizing 0.14% and MgO 0.41% into 3 mm or less is a thermosetting resin (resin concrete grade unsaturated polyester resin, cobalt naphthenate 1.0 g as an accelerator, and peroxide). 200 g of methyl ethyl ketone peroxide)
Was gradually added to the mixture and thoroughly stirred. 30 cm x this mixture
After casting in a mold of 30 cm × 7 mm to solidify, one black artificial marble having a weight of 1,300 g was prepared.

When the surface of this artificial marble was polished by a conventional method, a fine black artificial marble having a pure black color tone was obtained.

The physical properties of this product are as follows: tensile strength 130 kg
/ Cm²Bending strength 210kg / cm ², Flexural modulus 10
1,000 kg / cm²The room temperature water absorption is 0.09%
It was It does not burn when the lighter's fire approaches this product.
It was The electrical resistance value is 10 in volume specific resistance value.^TenIn Ω · cm
Yes, a value significantly lower than the electrical resistance value of a normal FRP
It was

Example 2 Graphite silica produced in Kaminokuni Town, Hokkaido (commonly known as silica black, composition SiO ₂ 78.50%, Al ₂ O ₃ 4.
30%, C 6.00%, Fe ₂ O ₃ 0.80%, C
aO 0.13%, MgO 0.12%) pulverized to 3 mm or less powder 3,600 g thermosetting resin 600 g
(The same accelerator and peroxide as in Example 1 were included in the same amount as in Example 1). 40 cm x this resin soup together with a mat of long glass fibers (weight per unit area 450 g / m ² ).
It was placed in a 40 cm × 7 mm mold and compression-molded at a temperature of 150 ° C. to obtain the same black artificial marble as in Example 1.

This product has a beautiful black surface,
There was no need to polish. The physical properties of this product are: tensile strength 700 kg / cm ² , bending strength 950 kg / cm ² ,
Flexural modulus 135,000 kg / cm ² , normal temperature water absorption 0.08%, electric resistance value is 10 ¹² Ω in volume resistivity value.
-It was below cm.

The artificial marble produced in the above-mentioned two examples is a product that can be sufficiently provided for building materials and other uses because of its black color tone and physical properties.

[0015]

Since the present invention is constructed as described above,
An artificial marble that has a black color tone and excellent physical properties.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C04B 26/02 B 26/18 D C08K 3/34 C08L 67/06 MSE E04F 13/14 101 9127- 2E // B29K 101: 10 105: 16 B29L 31:00

Claims (1)

[Claims] 1. An artificial marble obtained by solidifying natural graphite silica with a thermosetting resin.