JP2006035049A - Method of surface-treating artificial marble - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of surface-treating artificial marble to form a coating film in which dirt is hardly deposited on the surface and the deposited dirt is easily removed. <P>SOLUTION: In the artificial marble made from a polymer mainly comprising a thermosetting resin or a thermoplastic resin and inorganic filler, the surface is polished to have 0.2-1.0 μm average roughness and next, a silicone based resin compound is applied on the polished surface to form a coating film of the silicone based resin compound. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a surface treatment method for performing an antifouling treatment on the surface of an artificial marble made of a synthetic resin.

  In recent years, artificial marble decorative boards mainly composed of thermosetting resins such as vinyl ester resins, acrylic resins and polyester resins or synthetic resins of thermoplastic resins have been widely used for wall materials and kitchen ceilings because of their excellent physical properties and high-class feeling. Used as a plate.

  As an artificial marble, a resin composition in which an inorganic filler such as aluminum hydroxide is added to a thermosetting resin or a thermoplastic resin is often used, and this resin composition is formed to a predetermined thickness to suit the application. After being cut into a predetermined size, a portion corresponding to the decorative surface is polished and used as necessary.

  The artificial marble produced in this way is widely used after being commercialized as a wash counter, kitchen counter, bathtub, wash bowl and the like.

  Here, when artificial marble products are used in a field called watering, such as around toilets, bathrooms, and kitchens, dirt due to use, contamination due to detergents, dirt due to food, oil, cosmetics, etc. are easily adhered and cleaned. However, it was difficult to remove dirt even after cleaning, or dirt could not be removed even after cleaning. For these reasons, the advent of artificial marble with high antifouling performance that is difficult to get dirty and easy to remove.

  Marble is usually used as a stone material with moderate gloss on the surface, and artificial marble decorative plates are also used to polish the surface so that it has moderate gloss or for pattern expression. It was. When the surface of the artificial marble is polished, the inorganic filler contained in the resin matrix is exposed on the surface. Since this inorganic filler often has both hydrophilicity and lipophilicity, if various liquid contaminants adhere to the surface of the artificial marble decorative board, this interface is formed at the interface between the resin and the inorganic filler. There has been a problem that liquid contaminants penetrate and become difficult to remove (that is, antifouling performance is low). Further, this inorganic filler has a drawback that it is easily affected by chemicals such as bleach.

  Therefore, it has been considered to form a film on the surface of the artificial marble (see, for example, Patent Document 1), thereby protecting the internal resin and the like. Silicone resin compound added with liquid organic substance can be applied to the surface of artificial marble by spraying, applied to the surface of artificial marble with something like a brush, or silicone added with liquid organic substance. And wiping the surface of artificial marble with a cloth impregnated with a resin compound.

However, when the surface roughness of the artificial marble is too small (when the average roughness is less than 0.2 μm), it is difficult to form a silicone resin compound film on the surface of the artificial marble, and the surface roughness of the artificial marble is large. When it is too high (when the average roughness is 1.0 μm or more), there is a problem in that interference fringes and smears are formed on the silicone resin compound film.
JP 2001-190344 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a surface treatment method for artificial marble for forming a film that hardly adheres to the surface and easily removes the attached dirt. It is a problem to provide.

  In order to solve the above-mentioned problems, in the invention according to claim 1, in an artificial marble composed of a polymer mainly composed of a thermosetting resin or a thermoplastic resin and an inorganic filler, the surface has an average roughness of 0.00. Polishing to 2 to 1.0 μm, and then applying a silicone resin compound to which a liquid organic substance is added to the polished surface to form a silicone resin compound film on the surface Is. This makes it possible to form a coating film of a silicone resin compound having sufficient antifouling performance on the surface of the artificial marble and free from interference fringes and smears.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a liquid organic substance is added to the silicone resin compound applied to the surface of the polished artificial marble. As a result, the silicone resin compound can be further impregnated with the artificial marble, and the antifouling performance can be improved.

  In the present invention, it is possible to form a coating of a silicone resin compound having sufficient antifouling performance on the surface of the artificial marble and free from interference fringes and smears.

  The artificial marble in the present invention is molded from a thermosetting resin or a thermoplastic resin and an inorganic powder. As the thermosetting resin, one or more selected from vinyl ester resins, acrylic resins, and polyester resins are preferable, and as the inorganic powder, for example, calcium silicate, talc, kaolin, clay, silica, calcium carbonate, water Aluminum oxide, magnesium hydroxide, barium sulfate, calcium sulfate and the like are mentioned, but are not particularly limited. Among them, aluminum hydroxide is preferred, and aluminum hydroxide trihydrate, ie, gibbsite is more preferred. Used. The average particle size of the inorganic powder is preferably 0.1 to 100 μm, and more preferably 0.5 to 80 μm.

  The ratio of the polymer to the inorganic powder in the artificial marble matrix is preferably 50 to 500 parts by mass of the inorganic powder with respect to 100 parts by mass of the polymer. If necessary, additives such as a colorant and a pattern material may be added to the matrix of the artificial marble of the present invention. Any colorant can be used as long as it is a dye, an organic pigment, an inorganic pigment, or the like, and is usually used for an inorganic powder-containing resin molding such as artificial marble. Examples of the pattern material include, but are not particularly limited to, particles made of an organic resin or inorganic particles. Examples of the organic resin include, but are not limited to, for example, methyl methacrylate resin, polystyrene, polyvinyl chloride, polyester, epoxy resin, polyvinyl alcohol, and the like, and inorganic particles include, for example, marble particles, silica, Although mica etc. are mentioned, it is not limited to these in particular. The maximum dimension of these particles is preferably 10 mm or less, and more preferably 5 mm or less.

  Artificial marble is manufactured as described above. In the present invention, a film for imparting antifouling properties to the surface of the artificial marble is formed.

  The surface of the artificial marble is subjected to a polishing process such as buffing so that the average roughness thereof is 0.2 to 1.0 μm. Next, a silicone resin compound added with a liquid organic substance is applied to the polished surface to form a silicone resin compound film on the surface.

  The silicone resin compound is applied to the surface of the artificial marble. The silicone resin compound added with liquid organic substances is applied to the surface of the artificial marble by spraying, or it is applied to the surface of the artificial marble with something like a brush. Or wiping the surface of the artificial marble with a cloth impregnated with a silicone resin compound to which a liquid organic substance is added.

  And after apply | coating and infiltrating a silicone type resin compound to the surface of the said artificial marble, it is made to dry by the drying process by room temperature or a heating, and the coating film of about 2 micrometers in thickness is formed.

  By doing in this way, the surface roughness of the artificial marble is less than an average roughness of less than 0.2 μm, so that the silicone resin compound film is not easily formed on the surface of the artificial marble, The surface roughness of the artificial marble is too large with an average roughness of 1.0 μm or more, so that no interference fringes or smears are formed on the coating of the silicone resin compound, and dirt is attached to the surface. It becomes difficult and it becomes easy to remove the attached dirt, and it becomes possible to manufacture an artificial marble having high antifouling performance.

  Hereinafter, the present invention will be described in more detail based on examples.

  First, as a resin composition of artificial marble, vinyl ester resin (“Prominate P-311” manufactured by Takeda Pharmaceutical Co., Ltd.), aluminum hydroxide (“CW-308B” manufactured by Sumitomo Chemical Co., Ltd.), and vinyl ester resin are used. It was prepared by mixing 200 parts by mass with respect to 100 parts by mass, adding an appropriate amount of a curing agent (“Percure WO” manufactured by NOF Corporation), and mixing with a stirrer.

  This resin composition was defoamed under reduced pressure at 2666 Pa (20 Torr) for 30 minutes, poured into a mold, and the mold was heated at 90 ° C. for 70 minutes to cure the resin composition. An artificial marble molded as a thick flat plate was obtained.

  This artificial marble board is surface-polished with a nonwoven fabric abrasive ("Scotch Bright" # 240- # 1000 manufactured by Sumitomo 3M Co., Ltd.), and the average roughness is 0.2 μm to 1.0 μm (standard is 0.5 μm). ), And then a silicone resin compound (“room temperature curing type alkoxy oligomer (product general name)” manufactured by Shin-Etsu Silicone Co., Ltd.)) or by something like a brush or impregnated in a cloth. The surface was wiped or applied to the surface of artificial marble that had been polished, and dried at room temperature to form a coating on the surface.

Then, the surface of the artificial marble subjected to the surface treatment was evaluated for the presence / absence and level of smears and interference fringes on the surface, and the antifouling property. The antifouling property is the difference in color before and after the test when boiled in 500 ml of water using tea (Lipton tea pack), dropped on the surface of the artificial marble (poultice) and left for 24 hours to wash. Evaluation was performed by measuring. The boundary of the presence or absence of antifouling property was a color difference of 1.0. Evaluation was performed by measuring the color difference.
In Example 1, the average roughness was 1 μm, and in Example 2, the average roughness was 0.2 μm. The silicone resin compound was applied to these surfaces without any additives.

  In Examples 3 to 5, the average roughness of the surface is standard (that is, the average roughness of the surface is 0.5 μm), and liquid organic substances (in this embodiment) are added to these silicone resin compounds on these surfaces, respectively. What added alcohol) was apply | coated. As the liquid organic substance, ethanol was used in Example 3, ethylene glycol was used in Example 4, and propylene glycol was used in Example 5.

  On the other hand, in Comparative Example 1 and Comparative Example 2, the silicone resin compound to which no additive was added was subjected to surface polishing of the artificial marble plate with the count # 150 of the nonwoven fabric abrasive material in Comparative Example 1, respectively. The surface having an average roughness of 1.5 μm was coated on the surface having the average roughness of 0.1 μm by surface polishing with count # 3000 in the same manner as in Comparative Example 2.

  Moreover, the comparative example 3 evaluated the antifouling performance about the thing which made the average roughness of the surface 0.5 micrometer of standard, and has not apply | coated silicon resin.

  The conditions and evaluation results of Examples 1 to 5 are shown in Table 1, and the conditions and evaluation results of Comparative Examples 1 to 3 are shown in Table 2.

  From this, in Examples 1 to 5, as shown in Table 1, in any case, interference fringes (gloss that shines in seven colors) and coating spots (thickness variations appearing after drying appear as spots) It does not appear, and it is understood that the antifouling performance is satisfied. In particular, as in Example 3 to Example 5, in the case where a liquid organic material is added to a silicone resin compound, the silicone resin compound can be further impregnated with artificial marble, and the antifouling performance is improved. You can see that

  On the other hand, in Comparative Example 1 (average roughness 1.5 μm), the color difference is 2.4, and if the average roughness is too large, even if a silicone resin compound is applied, the surface will be stained in fine irregularities. As a result, it was easy to remain and the antifouling property was low. In Comparative Example 2 (average roughness 0.1 μm), interference fringes appear and coating spots appear. If the average roughness is too small, the penetration of the silicone resin compound into the fine irregularities on the surface or the filler interface is weak. There is a possibility that the interference fringes remain on the surface and the product design changes.

  Moreover, in the comparative example 3 (one which has not apply | coated the silicone type resin compound), a color difference becomes 5.5 and is a thing with low antifouling performance.

Claims (2)

  In an artificial marble made of a polymer mainly composed of a thermosetting resin or a thermoplastic resin and an inorganic filler, the surface is polished so that the average roughness is 0.2 to 1.0 μm, and then the polishing process is performed. A surface treatment method for artificial marble, characterized in that a silicone-based resin compound is applied to the surface to form a silicone-based resin compound coating on the surface.   A surface treatment method for artificial marble, comprising adding a liquid organic substance to a silicone-based resin compound applied to the surface of polished artificial marble.