JPH03122075A - Colored silica sand - Google Patents

Abstract

PURPOSE:To provide colored silica sand not losing the color brilliance thereof even when coated with a synthetic resin emulsion coating, by coating the surface of the colored silica sand with a water repellent or a water-repelling substance. CONSTITUTION:For example, silica sand colored with a black or brown pigment is coated with a silicone resin to prepare colored silica sand. The coated colored silica sand is scattered on the surface of a non-cured cement shaped product colored into dark brown by a dry method, and pressed with rolls. The scattered surface of the colored silica sand is coated with an acrylic emulsion coating, whereby the coating is repelled at the surface-deposited portion of the colored silica sand 2 due to the water-repelling agent coated on the surface to provide a multicolor-finished cement board 1 having the clear color of the colored silica sand 2 without hidden.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to silica sand for coloring used for coloring cement building materials used as roofing materials, wall board materials, etc.

[Conventional technology]

Conventionally, materials made of fiber-reinforced cement have been widely used as building materials such as roofing materials and wall board materials.

If this cement W building material is used as it is, the color is gray to dark black and lacks aesthetic appeal, so fPJ is the most suitable material to have various colors applied to the surface, such as painting. Colored silica sand may be used as a coloring material.

This colored silica sand is made by firing a mixture of silica sand and glaze.
Colored silica sand is used to bake glaze onto the surface.

[Problems with conventional technology]

However, in general, when cement building materials are colored with colored silica sand, synthetic resin emulsion 'rH''A is added over the sprayed colored silica sand 2 to impart water resistance to the surface of the building material 1, as shown in Figure 2. Even if the above-mentioned colored silica sand is sprinkled on the surface of the cement excipient to carry out 3', there is a problem that the colored silica sand is covered with a coating film and the color clarity of the silica sand disappears.

[Problem to be solved by the invention]

In view of the above-mentioned problems, the present invention has been made as IO'j to provide colored silica sand that does not lose its ri color sharpness even when coated with a synthetic resin emulsion.

[Technology that led to solving the problem]

That is, the colored silica sand of the present invention is characterized in that the surface of the silica sand colored in a baby color is coated with a T8 water agent or a substance that has a 1Ω water action.

[Effect]

In the present invention, 18 water or (Ω) is a substance for permanent residence.
Polytetrafluoroethylene (PTFE), polypropylene (PP), silicone resin, polyethylene 1
Refers to polychloroethylene trifluoride (PCTFE), vinyl chloride, etc.

(Ω water medicines are (Ω water-based substances that form a waterproof zone and keep out moisture, such as TeI, lafluoroethylene,
The IΩ water-acting substance is one that is waterproofed by a film, such as polyvinyl ethylene monochloride.

When using silicone as a water repellent, if adhesion with colored silica sand is not good, use silicone such as vinyl 7lan, ivy acryloquinopropyl solane, silanes with epoxy groups or amine groups, silicone rubber with vinyl groups, etc. Adhesion with colored silica sand and water effect (8) are ensured by using a bling agent and baking.

(8) The adhesion between the colored silica sand coated with a water agent and the cement excipient is due to the fact that when a synthetic resin emulsion is applied to the surface pressurized by the colored silica sand scattering roll, the paint is water-dispersible (Ω water agent). Also, depending on the water-based substance, it will fall into the valleys of the silica sand, and the colored silica sand will adhere to it due to the resin film, but when using a water repellent, such as silicone, there may be cellulose contained in the excipient. In this case, adhesive strength can be guaranteed by introducing a methyl method that reacts with silicon.

〔Example〕

The present invention will be explained below based on examples.

The colored silica sand according to the present invention is obtained by coating the silica sand that has been colored brown with a pigment with a silicone resin, and this is applied by a dry method according to a conventional method (1. Then the roll was pressurized.

Next, the surface on which the colored silica sand was sprinkled was coated with an acrylic emulsion using a flow coater.

As a result, as shown in Figure 1, the paint is repelled from the exposed surface of the colored silica sand 2 due to the 1B water agent coating the surface, and the colors of the colored silica sand 2 are clearly displayed without being hidden, resulting in a multicolored finish. A colored cement board 1 was obtained.

It was confirmed that the repelled paint was deposited in the valleys 3 between the colored silica sands 2 and 2, increasing the anchoring effect of the silica sand.

〔effect〕

As explained above, in this invention, the surface of the colored silica sand is water-repellent, and since the paint coating layer is repelled, the color of the colored silica sand is not hidden and appears extremely clearly even if a post-coating is performed.

Furthermore, the paint layer deposited between the water-repellent portions of the surface of the colored silica sand and the valleys between them has the effect of effectively preventing the infiltration of rainwater and the like from the outside.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional example. 7nom 72.1!27

Claims (1)

[Claims] (1) Silica sand for coloring, characterized in that the surface of silica sand colored in an arbitrary color is coated with a water repellent agent or a substance with a water repellent action.