JPH0577711B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for producing crayons,
The present invention relates to a method for producing crayons with excellent drawability and heat resistance at a high production rate without requiring a heating and cooling process. The present invention also relates to a method for producing a multicolored crayon in which the crayon layers of multiple colors are tightly bonded in a tessellated or multilayered manner without color mixing with each other.

(Prior art) Conventionally, there are four types of crayons: hard crayons, soft crayons, water-soluble crayons, and plastic crayons.All of them have wax, fat, and pigment as their main ingredients, and soft crayons contain relatively large amounts of these. Non-drying oils, extender pigments, and water-soluble crayons are made by adding surfactants, and plastic crayons are made by adding thermoplastic resins such as polyethylene.The manufacturing method for both is to heat and melt the raw materials except for the pigments. Pigments were added thereto and dispersed with sufficient stirring, then cooled to solidify and molded. In addition, the manufacturing method for crayons consisting of multiple colors involves repeating the process of pouring a small amount of heated and molten crayon material into a mold, cooling and solidifying it, and then pouring another color of crayon material on top of it and allowing it to cool and solidify. The idea was to mold it into crayons for books. Also, in Japanese Patent Application Laid-open No. 57-202361,
0.5-50Kg/cm ² by layering heated and softened crayons.
A method of gluing them together by applying pressure is disclosed.

(Problems to be solved by the invention) Conventional crayons are mainly composed of wax, so they generally have poor heat resistance and may soften or melt at temperatures below 100°C, resulting in low mechanical strength and stickiness. It also becomes. In addition, when heat resistance and mechanical strength are improved, a problem arises in terms of drawing performance, in that dense drawing becomes impossible.

In addition, in manufacturing, it is necessary to melt by heating and solidify by cooling, which requires a large amount of thermal energy.Furthermore, rapid cooling makes the crayon brittle, so slow cooling is required, which takes time. .

Producing crayons made of multiple colors using conventional manufacturing methods is very time-consuming because the heating and cooling operations are repeated for each color, and there are limits to how colors can be combined, and relatively large portions are required. I can only tell the colors apart.

Furthermore, in the method disclosed in JP-A-57-202361, if the temperature is high, the crayon will melt or the colors will mix at the boundary surface, which is unfavorable in terms of appearance. Also, if the temperature is low, the crayon will easily peel off at the interface. Furthermore, due to the nature of wax, crayons become brittle when external force is applied within the softening temperature range.

(Means for Solving the Problems) According to the present invention, higher fatty acid metal salts, polyethylene glycol that is solid at room temperature, pigments, and extender pigments are mixed in the presence of water and a surfactant, and a homogeneous mixture is granulated. There is provided a method for producing a crayon, which comprises the steps of: and press-molding the obtained granules at a temperature lower than the melting point of the higher fatty acid metal salt.

According to the present invention, the present invention further includes a step of mixing a higher fatty acid metal salt, polyethylene glycol that is solid at room temperature, a pigment, and an extender pigment in the presence of water and a surfactant, and granulating a homogeneous mixture. A method of producing multicolored crayons is made by blending multiple types of granules with different hues, filling this blend into a mold, and press-molding it at a temperature lower than the melting point of the higher fatty acid salt. A manufacturing method is provided.

(Function) The crayon of the present invention has remarkable features not found in known crayons. That is, the crayon of the present invention has the advantage that the higher fatty acid metal salt acts as an excellent fixing agent during pressure molding, and a crayon with excellent shape and dimensional stability can be easily obtained by pressure molding. . The waxes and oils conventionally used in the production of crayons have almost no binder effect during pressure molding, and therefore, simply press molding a conventional formulation results in a crumbly product with no solidifying power. There is a tendency not to get it. On the other hand, the higher fatty acid metal salt used in the present invention easily softens under pressure and exhibits an excellent fixing effect.

If pressure molding becomes possible, there will be no need for the conventional processes of melting by heating and solidification by cooling, which will also have the advantage of reducing manufacturing time and thermal energy consumption.

Furthermore, pigment particles and extender particles fixed with this higher fatty acid metal salt have the characteristic that when drawing on paper, they crumble with a slight shearing force and easily adhere to the paper surface. In addition, this higher fatty acid metal salt itself is slippery, and thus this crayon has a soft writing feel, and it is possible to draw richly.

In addition, in the present invention, higher fatty acid metal salts,
In addition to pigments, extender pigments, etc., polyethylene glycol, which is solid at room temperature, is added and blended.

The addition of polyethylene glycol improves the moldability of the granules when granulating a homogeneous mixture obtained by kneading the mixture of the above components in the presence of water and a surfactant, and the ability to pressure-form the granules into crayons. The advantage is that the moldability, including the releasability from the mold, is significantly improved.

Further, according to the present invention, since wax and oil, which are the main components of conventional crayons, are not used, the crayons are sticky and have excellent heat resistance, and do not repel water, so they can be used in combination with watercolors.

Furthermore, according to the present invention, crayons of multiple colors can be manufactured easily without repeating the heating and cooling process as in the past, and can be configured into various designs. can.

(Preferred embodiment of the invention) The higher fatty acid metal salt used in the present invention is
In order to be used as a crayon fixing agent, it must be solid at room temperature. Examples of metal salts include water-soluble salts such as sodium salts and potassium salts, and water-insoluble salts such as calcium salts, magnesium salts, barium salts, zinc salts, aluminum salts, lithium salts, and lead salts. Higher fatty acids include saturated fatty acids having 12 to 29 carbon atoms, especially 14 to 22 carbon atoms, such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid,
Mixed fatty acids such as heptadecylic acid, beef tallow fatty acid, and various hydrogenated oil fatty acids can be used. For the purpose of the present invention, among higher fatty acid salts, substantially water-insoluble fatty acid salts, such as alkaline earth metal salts, are preferable, and especially when calcium stearate is used, the best in terms of writing taste is preferred. Get results. Good results can also be obtained with calcium 12-hydroxystearate.

In the present invention, it is also important to use the higher fatty acid metal salt in an amount of 10 to 55% by weight, especially 15 to 40% by weight, and if this amount is less than the above range, the adhesive strength required for the crayon On the other hand, if the amount exceeds the above range, press molding tends to become difficult.

In the present invention, pigments and extender pigments include:
All the materials conventionally used in crayons can be used without restriction. Suitable examples of pigments and extender pigments include, but are not limited to, the following:

Black pigments: carbon black, lamp black, bone black, iron black.

Yellow pigments: yellow iron oxide, Hansa yellow, naphthol yellow, titanium yellow, benzidine yellow, permanent yellow.

Orange pigments Permanent Orange, Vulcan Orange, Benzidine Orange, IndusThrene Brilliant Orange.

Red pigment Red pigment, Resole Red, Brilliant Carmine, Permanent Red.

Violet pigments Manganese violet, fast violet, methyl violet lake, quinacridone violet.

Blue pigments: navy blue, phthalocyanine blue, ultramarine blue, first sky blue.

Green pigments malachite green lake, phthalocyanine green, naphthol green.

white pigment Titanium white, zinc white.

Extending pigments: calcium carbonate, barium sulfate, calcium sulfate, magnesium carbonate, clay, silica, talc, alumina white.

Among them, talc provides a writing taste that is closest to that of conventional crayons.

The total content of pigments is preferably 1 to 50% by weight, particularly 5 to 40% by weight, and the total content of extender pigments is 30 to 89% by weight, particularly 40 to 80% by weight. is desirable.

Further, the polyethylene glycol used in the present invention must have an average molecular weight of 1500 or more and be solid at room temperature. The amount added is preferably about 3 to 10% by weight based on the total weight, but it is also possible to add a slightly larger amount.

As the surfactant, nonionic and cationic surfactants are preferred, and polyoxyethylene alkyl ether and polyoxyethylene alkyl phenyl ether are particularly preferred. By incorporating a surfactant, the wettability of the ingredients such as higher fatty acid salts and pigments with water is improved, and it is possible to disperse them into fine particles, making it possible to produce extremely homogeneous mixed granules. .

In addition to the above-mentioned essential components, arbitrary auxiliary agents can be added to the crayon drawing material used in the present invention.
For example, a small amount of fragrance or the like may be added.

According to the present invention, the above-described pigment, extender pigment, higher fatty acid salt, polyethylene glycol, and other components are kneaded in the presence of water, and this kneaded composition is granulated and dried. Kneading can be performed using a Henschel mixer, kneader, Banbury mixer, roll, etc., depending on the viscosity of the composition, so that the higher fatty acid metal salt is evenly mixed with the pigment and extender pigment particles. Perform kneading. The amount of water added to the above components may be such as to uniformly atomize, disperse, and mix each component, and add 5 to 20% water by weight based on the total amount of each component in a dry state. It is desirable to have it exist. The kneaded composition can be granulated using a granulation method known per se, such as a spray drying granulation method, an extrusion granulation method, a mold granulation method, a fluidized granulation method, a flaking granulation method, a crushing granulation method, This can be carried out by any method such as rolling granulation method or tablet granulation method. The morphology of the grains is
It may be in any shape such as granules, spheres, cylinders, irregular shapes, tablets, etc., and the particle size is preferably in the range of 0.1 to 5 mm, particularly 0.5 to 1 mm, from the viewpoint of handling and press molding. In some of the above-mentioned granulation methods, drying is carried out simultaneously with granulation, but if the composition after granulation still retains moisture, the granules are dried to remove moisture. .

Next, the obtained dry granules are filled into a mold and pressed into the shape of a rod-like crayon to produce a product. The shape of the product is not limited to a rod-like shape, but can also be molded into any shape. The pressing pressure at this time can be varied in the range of 100 to 1000 kg/cm ² , and the pressure can be changed from a soft type crayon when the molding pressure is low to a hard type crayon when the molding pressure is high, even for the same material. Another significant advantage is that crayons with different drawing characteristics can be obtained.

Furthermore, in order to produce crayons of a plurality of colors, granules of a large number of colors are granulated by the method described above. Although the particle size is slightly larger, in the range of 1 to 3 mm, for aesthetic appearance, it may be outside this range. Granules of different colors are blended and molded using the method described above. At this time, any number of colors can be used.

Further, according to the present invention, the above-mentioned components are kneaded,
By granulating and drying to form granules, not only do the components become homogeneously mixed, but also the drying is carried out in granular form, which has the advantage of short drying time and high productivity. Furthermore, in connection with the use of higher fatty acid metal salts and the formation of kneaded granules in advance, it becomes possible to press-form with a so-called drive, resulting in uniform shape and dimensions, uniform writing feel, and a low defect rate. Another advantage is that a crayon product with extremely low

The invention is illustrated by the following examples.

Example 1 The following formulation Talc 20 parts by weight Calcium stearate 5 Hansa Yellow 10G 2 Potassium oleate 1 Polyethylene glycol (average molecular weight 6000)
The composition of 1 〃 was well kneaded in the presence of 6 parts by weight of water, and the kneaded product was subjected to extrusion granulation to obtain an average particle size of 1.
It was molded into granules (referred to as granules Y) of mm.

Put this granular material into a crayon mold,
Pressed at room temperature with a pressure of 200Kg/ ^cm2 , diameter 8
It was molded into a prismatic crayon with a length of 50 mm and a length of 50 mm.

The crayon obtained in this example had good drawing properties on paper, was not sticky like conventional crayon, and did not soften or deform at all even after being left at 120° C. for 3 hours.

Furthermore, even when the paper was painted over with watercolors, it did not repel water at all.

Example 2 The following formulation Talc 20 parts by weight Calcium stearate 10 Titanium dioxide 2 Phthalocyanine blue 2 Polyoxyethylene nonyl phenyl ether
0.2 Sodium stearate 1 Polyethylene glycol (average molecular weight 6000)
Granules B were obtained from the composition of Example 6 in the same manner as in Example 1. Furthermore, Granules R were similarly obtained using Fast Carmine 6B instead of Phthalocyanine Blue in the above formulation. Equal amounts of granules Y, B, and R, V
After mixing in a mold mixer, the mixed granules were placed in a crayon mold and pressed at room temperature with a pressure of 300 kg/cm ² to form a red, prismatic shape with a diameter of 8 mm and a length of 50 mm.
A mosaic-like multicolor crayon consisting of three colors, yellow and blue, was molded.

When drawing lines using the mosaic crayon obtained in this example, depending on the direction and angle,
I was able to draw colorful lines with a wide variety of colors such as yellow, blue, or a mixture of them, orange, purple, and green.

Further, like the crayon obtained in Example 1, this multicolor crayon had good drawability, was not sticky to the hands, and had good heat resistance.

Comparative Example 1 In Example 1, extrusion granules were obtained in exactly the same manner as in Example 1 except that polyethylene glycol (average molecular weight 6000) was not added to the formulation of Example 1.

This granulated material (granules) was placed in a crayon mold and pressed under the same conditions as in Example 1.

After pressing, the crayon was able to be released from the mold by its own weight, but unlike the case of the crayon in Example 1, some of the material on the crayon surface remained attached to the mold surface. Concavities were formed on a part of the crayon surface, making it impossible to obtain a crayon molded product with a good surface shape.

In particular, when press molding was repeatedly performed using the same mold, the releasability of the crayon worsened and the surface condition of the crayon deteriorated with each repetition. Fourth
In the second press molding, it was no longer possible to release the crayon by its own weight, and the crayon had to be forcibly peeled off to release the mold, and the surface condition of the crayon deteriorated to the point where it had no commercial value.

Comparative Example 2 In Example 2, the same granulation as in Example 2 was carried out in exactly the same manner as in Example 2, except that polyethylene glycol (average molecular weight 6000) was not added to the formulation of Example 2. I got something. The obtained granules were mixed at the same blending ratio as in Example 2,
The obtained mixed granules were pressed in exactly the same manner as in Example 2.

In this press molding, the crayon adhered to the mold from the beginning after pressing and was not released under its own weight.
When this was forcibly removed, a portion of the crayon material remained adhered to the mold, and a concave portion was formed in a portion of about 1/4 or more of one surface of the crayon.

Example 3 About 1/3 of the granules Y obtained in Example 1 were placed in a crayon mold, and the granules B obtained in Example 2 were placed on top of it.
Add about 1/3 of the mixture, and then add the granules R on top.
A multicolor crayon consisting of three layers of yellow, blue, and red was molded by pressing at 250 kg/cm ² at room temperature.

The three-layer crayon obtained in this example is:
It is also possible to use a single color or colors that overlap at the border.

Further, like Example 1, this multicolor crayon also had excellent drawing properties and heat resistance, and was not sticky.

Claims (1)

[Scope of Claims] 1. A step of mixing a higher fatty acid metal salt, polyethylene glycol that is solid at room temperature, a pigment, and an extender pigment in the presence of water and a surfactant, and granulating a homogeneous mixture, and the resulting granulated product. A method for producing a crayon, comprising the step of press-molding the above at a temperature lower than the melting point of the higher fatty acid metal salt. 2. The method according to claim 1, wherein the higher fatty acid metal salt is present in an amount of 10 to 55% by weight per granulate. 3. A step of mixing higher fatty acid metal salts, polyethylene glycol that is solid at room temperature, pigments and extender pigments in the presence of water and a surfactant, and granulating a homogeneous mixture is performed for each pigment with a different hue, so that the hues are different from each other. A method for producing a multicolored crayon, which comprises blending a plurality of different types of granules, filling the blend into a mold, and press-molding at a temperature lower than the melting point of the higher fatty acid metal salt.