JPS6357683A - Production of crayon - Google Patents

Abstract

PURPOSE:To obtain a crayon having excellent drawing and heat resistance characteristics etc., with high productivity, by blending together a metal salt of a higher fatty acid, a pigment, etc., granulating the blend, and then molding the granules under pressure at a temp. lower than the m.p. of the higher fatty acid metal salt. CONSTITUTION:A metal salt of a higher fatty acid (e.g., calcium stearate), a pigment (e.g., red iron oxide), and an extender (e.g., calcium carbonate) are homogeneously blended together in the presence of water and a surfactant (e.g., polyoxyethylene alkyl ether). Then, the homogeneous blend is granulated according to rolling granulation technique etc. The granules are molded under pressure at a temp. which is lower than the m.p. of the higher fatty acid metal salt, thereby obtaining the desired crayon. Suitably, a metal salt of a higher fatty acid is used in an amt. of 10-55wt% based on the wt. of the granule. The granulation, press moldability, etc., of the blend can be improved before granulation by adding a solid polyethylene glycol and blending with other components.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing crayons, including drawing properties,
The present invention also relates to a method for producing crayons with excellent 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 multicolor crayon in which the crayon layers of a plurality of colors are tightly bonded in a mosaic 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 have wax, fat, and pigment as their main ingredients; soft crayons have relatively large amounts of non-drying oil and extender pigments; water-soluble crayons have a surfactant; and plastic crayons have a thermoplastic resin such as polyethylene added. It was done,
The manufacturing method involves heating and melting the original material 4 excluding the pigment, adding the pigment thereto and dispersing it with sufficient stirring.
It was to be cooled, solidified, and then 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 a wooden crayon. In addition, in Japanese Patent Application Laid-Open No. 57-202361, crayons softened by heating are layered to give an α5 to 50
A method of gluing them together by applying a pressure of Kg/cm2 is disclosed.

(Problems to be Solved by the Invention) Conventional crayons have wax as their main component, so they generally have poor heat resistance and may soften or melt at temperatures below 100°C.They have low 4Y1 mechanical strength and are sticky. It can also be a cause. 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.

In addition, 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, and if the temperature is low, the crayon will peel off at the boundary surface. Furthermore, due to the nature of the wax, the crayon becomes brittle when external force is applied within its softening temperature range.

(Means for Solving the Problems) According to the present invention, a step of mixing a higher fatty acid metal salt, a pigment, and an extender pigment in the presence of water and a surfactant and granulating a homogeneous mixture; A method for producing a crayon is provided, which comprises the step of press-molding granules at a temperature lower than the melting point of the higher fatty acid metal salt.

According to the present invention, the step of mixing higher fatty acid metal salts, pigments, and extender pigments in the presence of water and a surfactant, and granulating a homogeneous mixture is performed for each pigment having a different hue, so that the pigments have different hues. Provided is a method for producing a multicolored crayon, which comprises blending multiple 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. .

(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 action during pressure molding, and therefore, simply press molding a conventional formulation would only yield a crumbly product with no solidifying force. There is a tendency not to be able to do so. On the other hand, the higher fatty acid metal salt used in the present invention easily softens under pressure and exhibits excellent fixation performance.

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

Furthermore, when pigment particles and extender particles are fixed with this higher fatty acid metal salt, when drawing on paper, it crumbles with a slight shearing force and easily adheres to the paper surface. The crayon itself is slippery, so it has a soft writing feel and allows for rich depictions.

Further, according to the present invention, the addition of polyethylene glycol also provides the advantage that granulation and press moldability are 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 non-sticky, 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. Metal salts include water-soluble salts such as sodium salts and potassium salts, calcium salts, magnesium salts, barium salts, zinc salts, and aluminum salts. , lithium salts, lead salts, and other water-insoluble salts. Higher fatty acids have 12 to 29 carbon atoms, especially 14 to 2 carbon atoms.
2 saturated fatty acids, 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 fats and oils 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 in particular, when calcium stearate is used, it is best in terms of writing taste. The result is obtained. 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, based on the total weight.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, all pigments and extender pigments conventionally used in crayons can be used without limitation. Suitable examples of pigments and extender pigments include, but are not limited to, the following:

Black pigment carbon black, lamp black, bone black,
Iron black.

Yellow pigment yellow iron oxide, Hansa yellow, naphthol yellow, titanium yellow, benzidine yellow, permanent yellow.

Orange pigments permanent orange, palkan orange, benzidine orange, industhrene brilliant orange.

Red pigment Red Garla, Lysole 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 pigment 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 pigment content is 1 to 50% by weight.

In particular, the content of the extender pigment is preferably 5 to 40% by weight, and the total content of the extender pigment is preferably 30 to 89% by weight, particularly 40 to 80% by weight.

Furthermore, the polyethylene glycol used in the present invention must have an average molecular weight of 1,500 or more and be solid at room temperature, and the amount added is preferably 3 to 10% by weight based on the total weight.

The surfactant is preferably nonionic or cationic, with polyoxyethylene alkyl ether and polyoxyethylene alkyl phenyl ether being particularly preferred. This improves the wettability of the two, making it 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. Mixing can be carried out using a Henschel mixer, Nigu, Panbali 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. The amount of water added to the above components for mixing may be such that uniform atomization and dispersion and mixing of each component is achieved, and the amount of water added to the above components should be between 5 and 10%, based on the total amount of each component in a dry state. The granulation of the kneaded composition, in which the presence of 20% by weight of water is desirable, is carried out by granulation methods known per se, for example the spray dry-blast granulation method.

The form of 0 grains made by any method such as extrusion granulation, mold granulation, fluidized granulation, flaking granulation, crushing granulation, rolling granulation, tablet granulation, etc. , granular, spherical, cylindrical, irregularly shaped, tablet-like, etc., and the particle size is in the range of α1 to 51Ill+, particularly 0, 5 to [■ In the above-mentioned granulation method, where it is desirable to remove.

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 press pressure at this time is 100 to 10
00 Kg/co+2, from soft type crayons when the molding pressure is low to hard type crayons when the molding pressure is high, and crayons with different drawing characteristics can be obtained from the same material by changing the pressure. Another notable advantage is that

In addition, in order to produce crayons consisting of multiple colors, the particle size for granulating multiple colored particles using the above method should be slightly larger, approximately 1 to 3 mm, for aesthetic purposes, but outside this range, Granules of different colors, which may be present, are blended and shaped by the method described above. At this time, any number of colors can be used.

Further, according to the present invention, by mixing the above-mentioned components, granulating them, and drying them to form granules, each component is not only homogeneously mixed, but also dried in granular form.
It has the advantage of short drying time and high productivity. Furthermore,
In connection with the use of higher fatty acid metal salts and the pre-formation of cross-wire granules, so-called dry press molding is possible, with constant shape and dimensions, uniform writing feel, and extremely low defect rate. Another advantage is that a low crayon product can be obtained.

The invention is illustrated in the following examples.

Example 1 Following formulation Talc 20 parts by weight Calcium stearate 5 tt Hansa Yellow 10
G2//potassium oleate
1. The composition of 〃 was well kneaded in the presence of 6 parts by weight of water, and the mixed material was extrusion granulated to obtain an average particle size of 1 m.
m granules (referred to as granules Y).

The granules were placed in a crayon mold and pressed at a pressure of 200 Kg/cm2 at room temperature to form a mold with a diameter of 8 mm.
And it was molded into a prismatic crayon with a length of 50 mm.

The crayon obtained in this example has good drawing properties on paper, is not sticky like conventional crayons, and has a
Even after being left at 20°C for 3 hours, there was no softening or deformation at all.

Furthermore, even if watercolor paint was applied over the paper after drawing, water was not repelled at all.

Example 2 The following formulation Talc 20 parts by weight Calcium stearate 1Ol/Titanium Dibo
2 // Phthalocyanine blue
2 tt Sodium stearate l
Granules B were obtained using the composition of // in the same manner as in Example 1. Furthermore, Granules R were obtained in the same manner using First Carmine 6B instead of Phthalocyanine Blue in the above formulation. After mixing equal amounts of granules Y, B, and R in a V-type mixing machine, put the mixed granules into a crayon mold,
Pressure at room temperature and pressure of 300 Kg/c+a2, diameter 8
A mosaic-like multi-colored crayon having a prism shape of 0+111 mm and a length of 50+ am and consisting of three colors of red, yellow, and blue was molded.

When a line is drawn using the mosaic crayon obtained in this example, the color becomes red depending on the direction and angle.

It was possible to draw colorful lines with a wide variety of colors such as yellow, blue, or their overlapping colors, such as tQ, purple, and green.

Further, like the crayon obtained in Example 1, this multicolor crayon had good drawing properties, did not stick to hands, and had good heat resistance.

Example 3 Granules Y obtained in Example 1 and 1/3 in a crayon molding mold
About 1/3 of the granules B obtained in Example 2 were added thereto, and then the granules R were added on top of the granules B.
A multicolor crayon consisting of three layers of yellow, blue, and red was molded by pressing at 0 Kg/ctrr2.

The three-layer crayon obtained in this example can be used in a single color or in overlapping colors at the color boundaries.

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

Claims (4)

[Claims] (1) A step of mixing a higher fatty acid metal salt, a pigment, and an extender in the presence of water and a surfactant, and granulating a homogeneous mixture, and granulating the resulting granules at a temperature lower than the melting point of the higher fatty acid metal salt. A method for manufacturing crayons, which comprises a step of pressure molding at high temperature. (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) The method according to claim 1, in which polyethylene glycol, which is solid at room temperature, is used in conjunction with the production of the homogeneous mixture. (4) A process of mixing higher fatty acid metal salts, 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, and multiple types of pigments with different hues are mixed. A method for producing a multicolor crayon, which comprises blending granulated products, filling this blend into a mold, and press-molding at a temperature lower than the melting point of the higher fatty acid metal salt.