JP4771519B2 - Solid paint - Google Patents

Description

  The present invention relates to a solid paint typified by a pastel or a container.

Conventionally, solid paints such as pastels and containers have been prepared by kneading extender pigments and colored pigments with water without forming materials such as waxes and gelling agents, and drying after extrusion molding. It is composed of extender pigments and colored pigments, but this alone causes a problem that the paint composition after drawing changes in hue due to the influence of the external environment such as temperature and humidity, and the writing taste itself is also It is not preferable, and the fixing property to the screen is not sufficient. As a measure to solve this, there is a method of improving the fixability by blending a resin or preventing a change in hue, but in this case, there is a problem that the original fresh color tone of the pigment is lost. . Therefore, a method is known in which a wetting agent is blended in addition to the extender pigment and the color pigment to solve the above problem (see Patent Document 1). By using the wetting agent, the fixability to the screen is improved, and the pigment particles are protected from the influence of the external environment, and the characteristics such as preventing the change in hue can be obtained.
JP-A-9-78024

  However, even if a wetting agent such as glycerin or ethylene glycol is used as in Patent Document 1, it is not sufficient for preventing a long-term hue change, and the color tone is also deteriorated. The reason is considered that the wetting agent, the extender pigment and the color pigment are easily separated and the dispersibility is inferior, which causes the color tone to be inferior and the writing quality to be unfavorable. The addition of a surfactant can be considered as a method for improving dispersibility, but since the surfactant itself is not physically and chemically stable, the problem of eventually changing due to the external environment is inevitable. . Therefore, the present invention has been studied to solve the above problems.

The present invention relates to a solid paint that maintains a fresh color tone with no hue change and excellent writing quality and fixability, and is a liquid or paste-like material having at least a constitution material, a color pigment, and an average molecular weight of 1000 or less. It is a first gist to be composed of polyethylene glycol and blend polyether-modified silicone in addition to the material.

  The solid paint of the present invention is characterized in that the hue on the drawing surface is not impaired for a long period of time, the fresh color tone of the pigment itself is obtained, the fixing property is good, and the writing quality is also good.

  The solid paint of the present invention achieves the object of ensuring the stability of hue by blending at least the extender and the color pigment or the wetting agent with silicone.

  Next, the solid paint of the present invention will be specifically described. As the extender, any conventionally known material can be used, and examples thereof include talc, clay, silica, calcium carbonate, barium sulfate, alumina, mica, boron nitride, potassium titanate, glass flakes and starch. In particular, talc and calcium carbonate are preferable from the viewpoint of moldability. The amount of the extender is arbitrary, but is preferably about 10 to 85% by weight based on the total amount of the solid paint. If it is less than 10% by weight, the moldability deteriorates, and if it exceeds 85% by weight, the color development becomes weak and the fixability is poor.

  As the color pigment, any conventionally known pigment can be used, and examples thereof include inorganic pigments, organic pigments, white pigments, pearl pigments, metal pigments, fluorescent pigments, and the like. From the viewpoint of properties, organic pigments are most preferable. Specific examples of the inorganic pigment include carbon black, iron black, ultramarine blue, and petal, and examples of the organic pigment include azo pigments, indigo pigments, phthalocyanine pigments, quinacridone pigments, and thioindigo pigments. Examples of white pigments include titanium oxide and zinc oxide, and examples of fluorescent pigments include daylight fluorescent pigments and phosphorescent pigments. The blending amount of the color pigment is arbitrary, but is preferably 1 to 40% by weight based on the total amount of the solid paint. If it is less than 1% by weight, the color development becomes insufficient. If it exceeds 40% by weight, it is difficult to form a solid and the writing quality deteriorates.

  The wetting agent may be anything as long as it has a water retention property, and examples thereof include glycerin, sorbitol, ethylene glycol, propylene glycol, polyethylene glycol, triethanolamine, and polyglycerin. Pasty polyethylene glycol is preferred. By adding the wetting agent, the change in hue due to humidity or the like is further prevented, and the fixing property to the drawing surface is further improved. In addition, the wetting agent has a granulating action and good moldability. The amount of the wetting agent is preferably in the range of 5 to 20% by weight with respect to the total amount of the solid paint. If it is less than 5% by weight, the fixability is deteriorated and the granulating action is inferior, and if it exceeds 20% by weight, the writing quality is deteriorated.

  Examples of the silicone used in the present invention include linear silicones such as polydimethylsiloxane, polymethylhydrogensiloxane, and polymethylphenylsiloxane, and modified silicones in which a part of the methyl group of polydimethylsiloxane is substituted with an organic functional group. Any of these may be used, but modified silicones are preferred, and amino groups, epoxy groups, carboxyl groups, carbinol groups, methacryl groups, alkoxy groups, polyether groups, alkyl groups are preferred as organic functional groups. , Methyl styryl group, trifluoroalkyl group, and the like. In particular, polyether-modified silicone is most preferable in that it is hydrophilic. The viscosity of the silicone is preferably 10 to 2000 cSt at 25 ° C. If it is less than 10 cSt, the volatility becomes high and the object of the present invention cannot be achieved, and if it exceeds 2000 cSt, the writing feeling becomes heavy. The blending amount of silicone is preferably 1 to 20% by weight based on the total amount of solid paint. If it is less than 1% by weight, the writing quality is inferior and the hue cannot be prevented. If it exceeds 20% by weight, the freshness of the color deteriorates.

  The reason why the performance is improved by adding silicone in addition to the extender and the color pigment or further the wetting agent is not clear, but the silicone forms a film on the outer periphery of the particles consisting of the extender and the color pigment, and it is uniform. It is thought that the dispersion and the addition of a wetting agent facilitates the formation of granular particles by the granulating action of the wetting agent, and the more uniform particles are dispersed without variation. In other words, silicone with physically and chemically stable properties protects the favorable characteristics of the combination of the extender and the color pigment or further the wetting agent, which is stable in terms of freshness of hue and changes in hue. It is also thought to be the reason that brings about the properties. In addition, since silicone itself has smoothness, it seems that a writing taste will necessarily become preferable.

  Here, since the above-mentioned silicone is generally hydrophobic, it is preferable to add a surfactant for the initial mixing when adding a water-soluble wetting agent. Since it is oily and hydrophilic, it has a surface active effect of mixing and dispersing the extender, the color pigment, and the wetting agent without separating them, making it a particularly preferred material.

  In addition to the above components, viscosity modifiers, fungicides, preservatives, antibacterial agents, fragrances and the like may be added as necessary. Further, as described above, a surfactant such as nonionic, cationic or anionic may be added as necessary for compatibilization of the components.

  As a method for producing a solid paint according to the present invention, first, a colored pigment and an extender are put in water, mixed while being pulverized, water is evaporated, and then this pulverized product is submerged in water mixed with silicone and a wetting agent. In addition, after mixing, the water is evaporated, put into a container and molded into a solid paint. Here, water is used as a solvent, but an organic solvent may be used. Further, the shape after being molded in a predetermined container may be any shape as long as it is solid, and examples thereof include a rod shape and a square shape. Next, examples of the present invention will be described. “Parts” is “parts by weight”.

(Comparative Example 1)
Silicone 15 parts
(Polyether-modified silicone)
(Viscosity: 100 cSt at 25 ° C)
Colored pigment (organic pigment: red) 10 parts Body material (talc) 75 parts Water 100 parts Using the above materials, first put the organic pigment and talc in 50 parts of water, mix well while crushing, and then evaporate the water . Next, the pulverized product is added and mixed in 50 parts of water mixed with silicone, and after evaporating the water, it is filled into a predetermined container, molded and solidified to obtain a red solid paint. It was.

(Example 1)
Silicone 3 parts
(Polyether-modified silicone)
(Viscosity: 100 cSt at 25 ° C)
Polyethylene glycol (molecular weight 1000) 10 parts Colored pigment (organic pigment: red) 17 parts Body material (talc) 70 parts Water 100 parts First, put the organic pigment and talc in 50 parts of water and pulverize well. The water is evaporated after mixing. Next, in 50 parts of water mixed with silicone and polyethylene glycol, the pulverized product is added and mixed, and after evaporating the water, it is filled into a predetermined container, molded, solidified, and then red solid I got the paint.

(Comparative Example 2)
7.5 parts of silicone
(Polydimethylsiloxane)
(Viscosity: 20 cSt at 25 ° C)
Glycerin 10 parts Colored pigment (organic pigment: red) 10 parts Body material (talc) 72 parts Surfactant (sodium lauryl sulfate) 0.5 part Water 100 parts First, organic pigment and talc in 50 parts water And evaporate the water after mixing well. Next, in 50 parts of water mixed with silicone, glycerin and surfactant, the pulverized product is added and mixed, and after evaporating the water, it is filled into a predetermined container, molded, solidified, and reddish A solid paint was obtained.

(Comparative Example 3 )
In Comparative Example 1, using other materials excluding silicone, putting organic pigment and talc in ethanol, mixing while thoroughly pulverizing, evaporating ethanol, filling into a predetermined container, molding, solid A red solid paint was obtained.

(Comparative Example 4 )
In Example 1 , a red solid paint was obtained in the same process as Example 1 using other materials except silicone.

(Comparative Example 5 )
Using liquid paraffin in place of the silicone of Example 1 to give a red solid paint in the same process as in Example 1.

Hue change for the Example 1 Contact and Comparative Example 1-5, the fixing property, drawing property (writing feeling), was compared in color tone. The hue change was visually observed for the hue one month after drawing on the paper. The fixability and the drawability are sensory tests when the image is actually drawn, and the color tone is visually observed.

  As is clear from Table 1, the solid paint of the present invention has excellent characteristics such as no change in hue even after a long period of time, a fresh color tone, and a smooth and stable performance. It can be seen that

  Stable use is possible because of excellent writing and color tone and no change in hue.

Claims (1)

A solid paint comprising at least an extender, a color pigment, and a liquid or pasty polyethylene glycol having an average molecular weight of 1000 or less , and a polyether-modified silicone in addition to the material.