JP2000063764A - Coating material with stone face tone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating material with stone face tone, capable of giving coated film sharpness and depth in color and capable of improving coated film properties such as stain resistance, water resistance, weatherability, etc. SOLUTION: This coating material with stone face tone comprises (A) a base coating material including synthetic resin emulsion having <=150 nm average particle diameter and 0-50 deg.C Tg as a binder and (B) pulverized powder of natural stone and/or colored aggregate. The component B is included in a content of 300-1,000 pts.wt. based on 100 pts.wt. resin solid content in the synthetic resin emulsion in the component A. The component A has >=5% optical transmissivity (shown by the ratio of intensity after passing through a cell to intensity before passing through the cell, where the cell has 5 mm thickness in a state containing a sample and light passing through the cell has 660 nm wavelength).

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stone-like coating material which does not require a top coat and has excellent appearance and physical properties of a coating film. 2. Description of the Related Art As a surface decorative material for finishing natural stones on buildings and civil engineering structures, a stone-like coating material obtained by mixing a crushed natural stone or a colored aggregate with a synthetic resin emulsion is widely used. . Japanese Patent Publication No. 2-40702 discloses a stone coating material comprising a specific coloring material, an aggregate having a specific light transmittance, and a binder. The stone-like coating material of the present invention provides a coating film having a pattern close to that of natural stone and a deep color tone by blending an aggregate having a specific light transmittance. [0003] In practice, however, simply applying the stone-like coating material of the present invention does not give sufficient depth to the color tone, and a more transparent top coat is applied on the stone-like coating material. It was necessary to do. When the stone-like coating material of the present invention is used without applying a top coat, contaminants easily enter the coating film, and the coating film deteriorates or discolors when exposed to sunlight or rainfall. There is a problem that is likely to occur. Therefore, the top coat is indispensable for improving the coating properties such as stain resistance, water resistance and weather resistance. [0004] As described above, the top coat imparts sharpness and depth of color to the stone-like paint, and furthermore, the coating properties such as stain resistance, water resistance and weather resistance. Although it is indispensable to improve
Since the number of processes is increased, the construction period is lengthened and the process is complicated. Further, since the top coat is transparent, it is difficult to control the amount of application, it is difficult to apply uniformly, and it is easy to cause a difference in the application amount partially. Due to the difference in the amount of coating, unevenness occurs in the formed coating film from the initial stage, and after aging, unevenness occurs due to the difference in stain resistance, water resistance, and weather resistance. [0005] Therefore, the problem to be solved by the present invention is to provide a formed coating film with sharpness and depth of color without applying a top coat, and furthermore, to provide a stain resistance,
An object of the present invention is to provide a stone-like coating material capable of improving coating film properties such as water resistance and weather resistance. The present inventors have conducted intensive studies to solve these problems, and as a result, as a result, a specific synthetic resin emulsion was used as a binder, and a light transmittance of 5% or more was obtained. A stone-based coating material in which a crushed natural stone and / or a colored aggregate is blended with a base paint having transparency eliminates the need to apply a top coat, and provides sharpness and depth of color to the formed coating film. The present invention has been found to be capable of imparting, and further improving the properties of the coating film such as stain resistance, water resistance and weather resistance, and has completed the present invention. More specifically, the stone preparation material of the present invention comprises (A) a base coating material containing a synthetic resin emulsion having an average particle size of 150 nm or less and a Tg of 0 ° C. to 50 ° C. as a binder, and (B) pulverization of natural stone. And / or colored aggregate, and the compounding amount of (B) is 300 parts by weight with respect to 100 parts by weight of the resin solid content of the synthetic resin emulsion contained in (A).
１０００1000 parts by weight, and the light transmittance of (A) (wavelength 660 passing through a 5 mm thick cell containing a sample).
(a value expressed by the ratio of the intensity after passing through the cell to the intensity before passing through the cell with respect to light of nm) is 5% or more. Hereinafter, the present invention will be described in detail based on its embodiments. (A) The base paint has an average particle size of 150 nm.
And a synthetic resin emulsion having a Tg of 0 ° C. or more and 50 ° C. or less and various additives. (A) The synthetic resin emulsion as a binder for the base paint has an average particle size of 150 nm or less and a Tg0
It is essential that the temperature is not lower than 50 ° C and not lower than 50 ° C. When the average particle size is 150 nm or less, the surface of the aggregate can be covered densely and efficiently, and the sharpness and depth of color of the formed coating film can be improved without applying a top coat. It is possible to improve the coating properties such as stain resistance, water resistance and weather resistance. The average particle diameter is measured by a laser diffraction scattering method and is represented by a median diameter obtained from the measured particle size distribution. When a synthetic resin emulsion having an average particle size of more than 150 nm is used, the surface of the aggregate cannot be covered densely, so that sharpness and depth cannot be obtained, and contaminants permeate into the coating film to prevent contamination. Poor sex. Average particle size 150nm
To get the same sharpness and depth as the following,
The amount of the emulsion must be increased, and as a result, the viscosity of the coating material decreases, and the coating material cannot be thickly applied. In order to increase the viscosity of the coating material, it is necessary to add a large amount of thickener, the transparency of the base paint decreases, the color sharpness and depth cannot be obtained, and the water resistance and weather resistance Will cause a drop in gender. The Tg of the synthetic resin emulsion is from 0 ° C. to 50 ° C. When the temperature is lower than 0 ° C., the stain resistance of the formed coating film is significantly reduced. When the temperature is higher than 50 ° C., the coating film is liable to crack. [0015] The kind of resin of the synthetic resin emulsion is not particularly limited. For example, acrylic resin,
An acrylic styrene resin, an acrylic urethane resin, an acrylic silicon resin, a fluorine resin and the like can be mentioned.
Of these, the use of an acrylic urethane-based resin, an acrylic silicon-based resin, or a fluorine-based resin can improve weather resistance, and is therefore preferable. The method for producing the synthetic resin emulsion is not particularly limited. For example, the emulsion can be produced by a method such as batch polymerization, monomer drop polymerization, emulsion monomer drop polymerization, or the like. The emulsifier used for the polymerization is not particularly limited, and one or two or more selected from anionic emulsifiers, nonionic emulsifiers, cationic emulsifiers and amphoteric emulsifiers can be used. When using an emulsifier having a reactive group, it is possible to improve the water resistance,
preferable. (A) It is essential that the light transmittance of the base paint is 5% or more. This makes it possible to impart sharpness and depth of color to the formed coating film, and to further improve water resistance and weather resistance. 5% light transmittance
If it is smaller, the formed coating film cannot have sharpness and depth of color, and the water resistance and weather resistance tend to decrease. The light transmittance is measured by a spectrophotometer,
660 n wavelength passing through a 5 mm thick cell containing the sample
For the light of m, it is represented by the ratio of the intensity after passing through the cell (the intensity of transmitted light) to the intensity before passing through the cell (the intensity of incident light). That is, it is represented by the following equation. Light transmittance (%) = {transmitted light intensity / incident light intensity} × 100 (A) The base paint contains various additives in addition to the synthetic resin emulsion. Examples of the additives include a film-forming aid, a thickener, a preservative, a fungicide, a dispersant, an antifoaming agent, a leveling agent, an anti-settling agent, an anti-sagging agent, an ultraviolet absorber, and an antioxidant. . Here, it is necessary to pay sufficient attention to the types and amounts of the additives so that the light transmittance of the base paint does not become smaller than 5%. (B) The pulverized natural stone and / or the colored aggregate are not particularly limited as long as they can exhibit a stone-like design. For example, crushed materials such as marble, granite, serpentine, granite, fluorite, cold water stone, feldspar, quartzite, quartz sand, ceramics / ceramic crushed materials, glass crushed materials, glass beads, resin crushed materials, resin beads, metal particles, etc. And those obtained by coloring their surfaces. These average particle sizes are usually from 0.01 mm to
Those having a range of 5.0 mm are used. The compounding amount of (B) needs to be in the range of 300 to 1000 parts by weight based on 100 parts by weight of the resin solid content of the synthetic resin emulsion.
It is preferably in the range of ~ 800 parts by weight. If the amount is less than 300 parts by weight, the concealing property of the formed coating film cannot be secured. When the amount is more than 1000 parts by weight, the formed coating film cannot have sharpness and depth of color, and stain resistance, water resistance, and weather resistance are reduced, and sufficient coating film physical properties cannot be obtained. . The stone-finished coating material of the present invention can be used for surface finishing of various materials such as metal, glass, porcelain tile, concrete, siding board, extruded plate, and plastic, and is mainly used for buildings and civil engineering structures. It is used to protect the skeleton of such as. At this time, the stone-like coating material of the present invention does not require a top coat and is applied as a final finished surface, and can be directly applied to a base material, or can be subjected to any surface treatment (base treatment, etc.). Although it is also possible to apply paint after applying, the present invention is not particularly limited. As a coating method, it can be applied by various methods such as iron coating, spray coating, roller coating and the like. Further, the surface of the building material can be pre-coated at a factory or the like. EXAMPLES Examples and comparative examples are shown below to clarify the features of the present invention. (Preparation of Coating Material) Using the synthetic resin emulsion shown in Table 1, a stone-like coating material was prepared with the composition shown in Table 2. The average particle size of the synthetic resin emulsion is determined using a particle size analyzer U.
It was measured with PA 9340 (manufactured by Nikkiso Co., Ltd.). The light transmittance of the base paint was measured with a spectrophotometer UV-2200 (manufactured by Shimadzu Corporation). The cell used was a glass cell MG-5 (manufactured by Fujiwara Seisakusho) having a thickness of 5 mm, and the measurement wavelength was 660.
nm. [Table 1] [Table 2] (Test method) 150 mm x 70 mm x 6 m
Mila Sealer ES (modified epoxy resin-based primer; manufactured by SK Kaken Co., Ltd.)
It was applied at 15 kg / m ^{2 and} dried at 20 ° C. and 65% RH (hereinafter referred to as “standard state”) for 3 hours. Next, the prepared stone-like coating material was applied at a coating amount of 4.0 kg / m ² , and dried under standard conditions for 14 days. The sharpness of the color and the appearance of the test plate prepared in depth were visually checked. In the evaluation, a plate coated with urethane top (urethane clear top coat; manufactured by SK Chemical Co., Ltd.) at a coating amount of 0.30 kg / m ² after applying the stone-like coating material of Comparative Example 1 (Hereinafter referred to as a reference plate). The evaluation is as follows. ：: equivalent to the reference plate x: inferior to the reference plate The presence or absence of cracks in the prepared test plate was visually confirmed. The evaluation is as follows. ：: No cracking ×: Crack generation Stain resistance The test piece prepared for the prepared test plate was placed facing south in Ibaraki City, Osaka, and exposed outdoors, and the degree of dirt after one month was evaluated. . The evaluation is as follows. Good △>△> × Poor weather resistance JIS B
An accelerated weathering test was performed with a sunshine weather meter specified in 7753, and the change in appearance after 500 hours was confirmed. The evaluation is as follows. Good △>△> × Poor (Test Results) The test results are shown in Table 3. [Table 3] [Examples 1 and 2] The same sharpness and depth as those of a reference plate coated with a top coat can be exhibited, and stain resistance and
The weather resistance was also good. [Comparative Example 1] Since an emulsion having a large average particle size was used, sharpness and depth of color could not be imparted, and stain resistance was poor. [Comparative Example 2] Since an emulsion having a low Tg was used, the stain resistance was poor. [Comparative Example 3] Since an emulsion having a high Tg was used, cracks occurred in the coating film. [Comparative Example 4] Since the amount of the thickener was increased, the light transmittance of the base coating material was lowered, and it was not possible to impart sharpness and depth of color. The stone preparation material of the present invention comprises a base paint having a specific synthetic resin emulsion as a binder, a light transmittance of 5% or more, and a pulverized natural stone and / or It does not need to be coated with a transparent top coat, and can impart sharpness and depth of color to the formed coating film, as well as stain resistance, water resistance, and weather resistance. And the like to improve the physical properties of the coating film.

Claims (1)

Claims: (A) An average particle size of 150 nm or less and Tg
A base paint comprising a synthetic resin emulsion having a temperature of 0 ° C. or more and 50 ° C. or less and a binder, and (B) a crushed product of natural stone and / or a colored aggregate, wherein the compounding amount of (B) is
Resin solid content 1 of synthetic resin emulsion contained in (A)
300 to 1000 parts by weight with respect to 00 parts by weight, and the light transmittance of (A) (for the light having a wavelength of 660 nm passing through a cell having a thickness of 5 mm containing a sample, the intensity of the cell passing with respect to the intensity before passing through the cell). Characterized by the following ratio of strength) is 5% or more.