JPH04236277A - Production of chalk for stone - Google Patents

Abstract

PURPOSE:To provide a chalk capable of clearly writing on a wet stone as well as a dry stone for cutting the stone to prescribed size or for polishing the surface of the stone and giving a written mark resistant to peeling or dissolution with water. CONSTITUTION:A coloring material and an extender material are preparatorily kneaded with a wax under heating to effect the dispersion of the materials in the wax in sufficiently uniform state. An aqueous solution of a water-soluble binder is added to the dispersion mixture and kneaded under heating. The produced mixture is formed and dried to obtain the objective chalk for writing on stone.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for producing chalk for writing or painting on stone surfaces, and furthermore, although it is hydrophilic, it does not easily peel off or dissolve in water, and it is suitable for use on stone surfaces. This invention relates to a method for producing chalk that exhibits good handwriting in checking, drawing, and painting.

0002

[Prior Art] When cutting stone to desired dimensions or polishing its surface, coloring is done by drawing lines on the stone surface or filling in the entire surface of the stone. Oil-based chalk is mainly used, which is made by mixing materials such as oils, fats, waxes, etc., and then molding the mixture into a desired shape.

0003

[Problem to be solved by the invention] However, oil-based chalk has sufficient stickiness for drawing lines and painting on dry stone surfaces, and there is no problem with it, but it has the disadvantage that it is almost impossible to write on wet surfaces. . On the other hand, so-called water-soluble chalk, which is made of colorants, extenders, oil waxes, and surfactants, can be written on on wet surfaces, but it dissolves immediately in the water on the surface and does not stick to the stone surface. It doesn't stick well and hardly any handwriting remains when rubbed. In particular, when polishing a stone surface, from a rough finish to a polished finish, the surface is painted with chalk and polished repeatedly while pouring water until it becomes a smooth glass-like surface. Although it is necessary to have good gloss even on a smooth surface, there has been no drawing material that satisfies these conditions.

[0004] As a method for solving these problems, the present inventor first used waxes, colorants, extenders, and water-soluble binders as main materials, and heated and kneaded these and water using a kneader, Henschel mixer, roll, etc. After that, we developed a method for producing markers by extrusion molding and drying. The chalk obtained by this method is hydrophilic, difficult to dissolve in water, sticks well to dry stone surfaces, and sticks relatively well to wet surfaces, making it easy to remove wet handwriting. It does not easily peel off or dissolve even if rubbed strongly. However, this chalk still did not stick well to fairly smooth and wet surfaces that were close to finishing, and there was a need for further improvements in its use.

[0005]

[Means for Solving the Problems] As a result of intensive studies to improve this drawback, we have developed a method in which colorants and extenders are heated and kneaded with waxes in advance so that they are sufficiently uniformly dispersed in the waxes, and water-soluble materials are added to the dispersion mixture. It was discovered that the chalk obtained by adding an aqueous solution of a binder, heating and kneading it in a kneader, extrusion molding and drying adheres extremely well to wet smooth surfaces, and completed the present invention. It has arrived.

That is, the present invention is based on a treatment method that also serves as a pretreatment for powder systems, in which a coloring agent and an extender are dispersed in wax in advance, and an aqueous binder solution is added thereto and kneaded. The present invention also provides a method for manufacturing chalk, which is characterized by the following.

[0007] Colorants used in the present invention include, for example, Lysole Red, Lake Red, Permanent Red, Watching Red, Hansa Yellow, Bendine Yellow,
One or more of commonly used colorants such as phthalocyanine blue, phthalocyanine green, and carbon black are selected as appropriate. The blending amount is 5 to 30% by weight. The extender material may be either natural or synthetic, and examples include talc, sericite, mica, kaolin, barium sulfate, anhydrous silicic acid, hydrated silicic acid, calcium carbonate, diatomaceous earth, etc., and one of these may be used as appropriate. Or two or more types are selected. The blending amount is 30 to 70% by weight. Examples of waxes include Japanese wax, beeswax, carnauba wax, candelilla wax, hydrogenated oil, rice wax, montan wax, ceresin, ozokerite, paraffin, microcrystalline wax, polyethylene wax, behenic acid, stearic acid, palmitic acid waxes, oils and fats, One or more types are appropriately selected from hydrocarbons, higher fatty acids, synthetic waxes, and the like. The amount is 1
0 to 50 weight percent. Water-soluble binders include sodium carboxycellulose, methylcellulose, polyvinyl alcohol, polyvinyl acetate resin,
The binder is appropriately selected from synthetic and natural binders such as polyvinyl methyl ether, tragacanth, and guar gum. The blending amount is 2 to 10 weight percent. In the present invention, in addition to the above-mentioned essential components, dispersing and wetting agents such as surfactants may be added as necessary.

[0008] Next, the manufacturing method of the present invention involves firstly kneading powder consisting of a colorant and an extender with wax while the wax is heated and molten, so that the surface of the powder and the wax are sufficiently mixed. After blending, adding an aqueous binder solution and heating and kneading prevents the water-soluble binder from bonding preferentially to the powder surface, making the entire system more hydrophilic. When adding powder, wax, and an aqueous binder solution at the same time and heating and kneading them, since the powder surface is hydrophilic, the binder preferentially binds to the powder surface, and the waxes exist in a free state. Therefore, the overall degree of hydrophilicity is reduced, and the hydrophilicity against wet surfaces is reduced, so it is thought that the gloss is inferior.

[0009]

EXAMPLES Next, the present invention will be explained in detail with reference to Examples. The present invention is not limited to these.

Example 1 Stearic acid
8 parts by weight hydrogenated oil
7″ rice wax
10″ talc
50 Watching Red
15 Carboxymethylcellulose
6 Guar gum
4 Water
100
〃

[0011] After heating and melting and mixing stearic acid, hydrogenated oil, and rice wax, talc as an extender and watching red as a red pigment were added, and after thoroughly heating and mixing in a mixer, the adhesive carboxymethylcellulose and guar gum were mixed with water. The dissolved and swollen adhesive solution was added and further heated and mixed. This mixture was further kneaded with heated rolls, adjusted to a moisture content of approximately 13%, formed into a round shape with a diameter of 8 mm using an extruder, cut into lengths of 100 mm, and dried at 50°C for 7 days. A round bar-shaped red chalk was obtained.

Comparative Example 1 Same composition as Example 1, stearic acid, hydrogenated oil,
Rice wax is heated and melted, and talc, which is a body material, is added to it.
Watching Red, a red pigment, and a mixed adhesive solution of carboxymethyl cellulose and guar gum dissolved and swollen in water were added, and the whole was heated and kneaded in a kneader, and then further kneaded with three heated rolls, resulting in a water content of approximately 13%. Thereafter, red chalk with a diameter of 8 mm and a length of 100 mm was obtained in the same manner as in Example 1.

Example 2 Microcrystalline wax 13 parts by weight Beeswax
6 Carnauba wax
7 12-hydroxystearic acid 9 Talc
30 Sericite
15 Phthalocyanine blue
10 Polyvinyl alcohol
10 Water
80 〃

0014
] Blue chalk was obtained in the same manner as in Example 1.

Comparative Example 2 A blue chalk was obtained using the same composition as in Example 2 and the same manufacturing method as in Comparative Example 1.

[0016] Each of the chalks of the example and the comparative example was
The results shown in Table 1 were obtained by comparing the coloring properties on a dry, smooth stone surface and a wet, smooth stone surface.

[0017]

[Table 1]

[0018]

[Effects of the invention] Chalk for writing on stone surfaces, which is made of colorants, extenders, waxes, and aqueous adhesives, colors very well even wet, smooth stone surfaces as well as dry, smooth stone surfaces. To provide a chalk for stone that does not easily peel off or dissolve even if the colored surface is wetted with water and rubbed strongly, and can be used extremely suitably for line drawing, surface painting, and polishing of stone surfaces. I can do it.

Claims (1)

[Claims] 1. A method for producing stone chalk, which comprises heating and kneading pigments, extenders and waxes, adding an aqueous binder solution, further heating and kneading, shaping and drying the mixture.