JP3010932B2 - Solid drawing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid drawing material such as a crayon, a pass or a solid correction tool.

[0002]

2. Description of the Related Art A solid drawing material is obtained by uniformly kneading a pigment and a wax, molding by heating and melting, and then cooling. For molding, methods such as pouring into a mold, extrusion molding, and injection molding are known. By the way, since the solid drawing material needs to show a high coating concentration and a high hiding degree, the content of the pigment has been increased. Therefore, when using a solid drawing material, there is a problem that hands, clothes, and the like are stained. In order to solve this problem, a method of winding a paper or resin film around a solid drawing material has been adopted.

However, in the above method, when a solid drawing material is used, the paper or the resin film must be torn in accordance with the use, and this operation is troublesome, or the torn paper or the film becomes dusty. Problem. As a solution to such a problem, for example, a thermoplastic material containing a pigment, a filler, and a wax is molded into a stick shape, and can be fused with the molded product and contains at least a wax having a high melting point. Japanese Utility Model Publication No. Sho 60-2948 has proposed a color chalk having a coating layer of a thermoplastic material formed on the surface of a molded article which does not contain a pigment and which is worn simultaneously with the molded article when used. As a method of manufacturing a solid drawing material having a coating layer formed on the surface,
Although methods such as extrusion molding and immersion molding are known, extrusion molding is often used from the viewpoint of manufacturing cost and uniformity of the surface coating layer.

[0004]

However, it is difficult to form a uniform and thin surface coating layer. The surface coating layer is to prevent stains on hands and clothes and to be worn at the same time as the solid drawing material when used. Therefore, the surface coating layer must be free from defects and must be formed thin. In forming such a surface coating layer, when a thermoplastic material having a high melting point as described in Japanese Utility Model Publication No. 60-2948 is used, in particular, when extrusion molding is used as a molding method, it is uniform. It was difficult to form a thin surface coating layer. This is because, in the case of extrusion molding, the solid drawing material cannot be extruded unless it is in a semi-molten state, so the heating temperature during molding is set lower than the highest melting point among melting substances such as wax contained in the solid drawing material. Because you have to do it. Therefore, since the above-mentioned thermoplastic material having a high melting point is not melted, it is difficult to form a uniform and thin surface coating layer.

[0005]

According to the present invention, there is provided a solid drawing material having a surface coating layer formed by extrusion molding, wherein the solid drawing material main body contains a pigment and wax,
The solid coating material is characterized in that the surface coating layer is a wax having a lower melting point than the highest melting point of the wax as a raw material of the solid drawing material main body.

The details will be described below. The solid drawing material according to the present invention is obtained by extrusion molding. That is, the raw material chips of the main body of the solid drawing material and the low-melting-point wax which forms the surface coating layer are respectively charged from separate material input ports of the extruder, and the machine is brought into a state where the raw material chips of the main body of the solid drawing material are in a semi-molten state. (That is, a temperature slightly lower than the highest melting point of the wax which is the raw material of the solid drawing material main body, the degree is the other components and the compounding ratio contained in the raw material chip, and further,
(It can be set appropriately depending on the performance of the extruder, etc.) The raw material chips of the solid drawing material main body are pressure-fed to a die of an extruder by a screw in a semi-molten state, and are formed into a die shape. On the other hand, the low-melting-point wax used as the surface coating layer is fed in a molten state to the die surface of the extruder by a gear pump, and is formed as a coating layer on the surface of the molded solid drawing material main body. In addition, the raw material chips of the solid drawing material main body are obtained by mixing and stirring the pigments and wax described below under heating and kneading with a kneading machine such as a kneader or a roll mill, if necessary, and pulverizing a hammer or the like. It is crushed by a machine.

[0007] The solid drawing material main body contains a pigment and a wax. Pigments are used as colorants or hiding agents. Inorganic pigments such as carbon black, titanium oxide, lead white, zinc oxide, lithopone, aureoline, cobalt green, cerulean blue, cobalt blue, cobalt violet, red iron oxide, navy blue and ultramarine; I. Pigment Orange 16 (naphthol-based orange pigment), C.I. I. Pigment Red 5 (naphthol red pigment), C.I. I. Pigment Red 48-3 (watching red strontium salt), C.I. I. Pigment Blue 68 (phthalocyanine blue pigment), C.I. I. Organic pigments such as Higment Green (a phthalocyanine green pigment) and the like, such as organic pigments, which have been conventionally used, can be used. These pigments can be used alone or
The pigments may be used in the form of a mixture of more than one kind, and the amount used depends on the type of pigment used, but is preferably 3 to 25% by weight based on the total amount of the solid drawing material main body.

[0008] Wax is used for adjusting the shape of the solid drawing material main body and for imparting coating performance to the solid drawing material. Animal waxes such as beeswax, whale wax, insect white wax, etc., plant waxes such as candelilla wax, carnauba wax, wood wax, mineral waxes such as montan wax and ozokerite, petroleum waxes such as paraffin wax and microcrystalline wax. Natural wax such as wax, Fischer-Tropsch wax, low molecular weight polyethylene and derivatives thereof, montan wax, paraffin wax, each derivative of microcrystalline wax, cetyl alcohol, stearic acid, phthalic acid ester, polyethylene glycol stearate, caster wax, etc. And the like. These waxes can be used alone or in a suitable mixture of two or more kinds. The amount of the wax used is 40 to 80 with respect to the total amount of the solid drawing material.
% By weight is preferred.

A wax having a melting point lower than the highest melting point of the wax as a raw material of the solid drawing material is used as a surface coating layer of the solid drawing material body. Caster wax # 100 (Caster wax, melting point: 85.5 ° C), extremely tallow hardened fat (melting point: 60.5 ° C), R-WAX-T (rice bran wax, melting point: 66.5 ° C) Synthetic Industry Co., Ltd.
PA900 (melting point: 60 ° C.), PA600 (melting point: 54 ° C.), PA500 (melting point: 55 ° C.) (above, a mixture of stearic acid and palmitic acid, Asahi Denka Kogyo Co., Ltd.)
MX-770 (magnesium stearate derivative, melting point 75 ° C., manufactured by Adeka Fine Chemical Co., Ltd.),
Stearic acid (melting point: 60.9 ° C.), purified carnauba wax No. 1 1 (carnauba wax, melting point 82.7 ° C),
Purified candelilla wax no. 1 (candelilla wax, melting point: 70.2 ° C.) (above, manufactured by Noda Wax Co., Ltd.), bleached montan wax # 813 (montan wax, melting point: 82 ° C., manufactured by Nippon Wax Co., Ltd.), hardened wax (melting point: 59) 8.8 ° C, manufactured by Kyowa Yushi Kogyo Co., Ltd.), dicyclohexyl phthalate (melting point 59.8 ° C), diphenyl phthalate (melting point 73 ° C) and the like. These waxes are appropriately selected depending on the type of wax used as a raw material of the solid drawing material. As described above, the surface coating layer is preferably uniform and thin. However, in the case of a solid drawing material having a size that can be used by a kindergarten or a child, it is preferably 1 mm or less. The surface coating layer may contain 0.01 to 2% by weight of a pigment based on the wax used as the surface coating layer. The purpose of keeping hands and clothes from being stained by the surface coating layer is sufficiently achieved by using only wax. The color becomes dull and appearance defects occur. In such a case, it is useful as a method for solving this disadvantage. The reason why the amount of the pigment used is as described above is that when the amount of the pigment is 0.01 to 2% by weight with respect to the wax, the wax completely covers around the pigment particles, This is because it is possible to prevent the hands and clothes from being stained. Further, as the wax used for the surface coating layer, it is preferable to use the same substance or a similar substance as the wax used for the solid drawing material main body. This is because the adhesion between the solid drawing material body and the surface coating layer is different when the wax used for the surface coating layer and the wax used for the solid drawing material body are the same or similar. This is because it is more improved than the case of the combination.

[0010] In addition to the above-mentioned components, if necessary, extenders or fillers of conventionally known extenders such as calcium carbonate, talc, clay, silica, barium sulfate and the like may be added to the solid drawing material body. 5 to 25 with respect to the whole body
% Or use a resin such as polyethylene, polypropylene, polyvinyl chloride, etc.
15% by weight or a pigment dispersant may be used.

[0011]

In the solid drawing material according to the present invention, since the surface coating layer is a wax having a melting point lower than the highest melting point of the wax which is a raw material of the solid drawing material main body, the wax forming the surface coating layer at the time of extrusion molding. Is completely dissolved on the surface, so that a uniform and thin surface film layer is formed.

[0012]

【Example】

Example 1 (solid drawing material body) MA-100 (carbon black, manufactured by Mitsubishi Kasei Co., Ltd.) 10 parts by weight 130 ° paraffin wax (melting point: 56.6 ° C., manufactured by Tonen Petrochemical Industry Co., Ltd.) 20 parts by weight HI -MIC-2095 (microcrystalline wax, melting point: 104.6 ° C, manufactured by Nippon Seiro Co., Ltd.) 20 parts by weight dihexadecyl phthalate (melting point: 66.2 ° C) 20 parts by weight (surface coating layer) 130 ° paraffin wax The components of the main body of the solid drawing material were kneaded and dispersed by a heated two-roll mill, and this material was formed into a plate having a thickness of 2 mm, and the plate was ground with a hammer to a size of 20 mm or less. This ground material is extruded into a 65 mm extruder (OSE-6).
Extrusion molding was carried out at a heating temperature of 90 ° C. using a 5-type (manufactured by Nagata Seisakusho). At this time, the surface coating layer having a thickness of 0.5 mm was formed by pumping the components of the surface coating layer onto the surface of the extruder die using a heating gear pump. Then, the extruded and molded solid drawing material is cooled,
It was cut to a predetermined length to obtain a solid drawing material.

Example 2 (solid drawing material body) Watching red (red pigment, manufactured by Dainichi Seika Kogyo Co., Ltd.) 10 parts by weight 130 ° paraffin wax (described above) 20 parts by weight IHF55 (hardened oil of fish fat, melting point 54. 4 ° C, 30 parts by weight manufactured by Miyoshi Oil & Fats Co., Ltd. Neowax L (low molecular weight polyethylene, melting point: 110.4 ° C, manufactured by Yasuhara Oils & Fats Co., Ltd.) 20 parts by weight Dihexadecyl phthalate 20 parts by weight (surface coating layer) Purified carnauba Wax No. 1 (above) The above components were made in the same manner as in Example 1 to obtain a solid drawing material.

Comparative Example 1 A solid drawing material was obtained in the same manner as in Example 1 except that Neowax L (described above) was used in place of 130 ° paraffin wax as the surface coating layer in Example 1.

The formation state of the surface coating layer of the solid corrector obtained in Examples 1 and 2 and Comparative Example 1 was observed. Although a uniform coating layer was formed on the solid drawing materials of Examples 1 and 2, the surface coating layer of the solid drawing material of Comparative Example 1 had a non-uniform surface coating layer such as a defective portion. Had been formed.

The solid correction tool obtained in Example 1 and Comparative Example 1 was used to apply to a drawing paper (a load of 1 kg, an application angle of 70 ° in the longitudinal direction with respect to the paper surface, and one reciprocal application). Then, the lightness (V value) of the coating film was measured with a color difference meter (Color Computer SM-4, manufactured by Suga Test Instruments Co., Ltd.). As shown in Table 1 below, the Example had a higher concentration. A coating was obtained.

[0017]

[Table 1]

[0018]

As described in detail above, the solid drawing material according to the present invention has a uniform and thin surface coating layer, and is excellent without soiling hands and clothes.

Claims (1)

(57) [Claims] 1. A solid drawing material having a surface coating layer formed by extrusion molding, wherein the solid drawing material main body contains a pigment and wax, and the surface coating layer is made of a wax which is a raw material of the solid drawing material main body. A solid drawing material characterized by being a wax having a lower melting point than the highest melting point.