JP2002235026A - Solid drawing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solid drawing material having less reduction in physical properties as a drawing material such as flexural strength, slip, abrasion, than a conventional drawing material containing talc as an extender pigment, a simple quality control operation being a part of the production of the solid drawing material due to needlessness of confirmation operation of absence of asbestos and excellent safety. SOLUTION: This solid drawing material comprises 2-60 wt.% of a laminar alumina and/or laminar alumina hydrate as an extender pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a crayon, a path,
The present invention relates to a color drawing pencil and other solid drawing materials, and particularly to a solid drawing material suitably used for a bar-shaped paint such as a crayon.

[0002]

2. Description of the Related Art Conventionally, talc has been used as an extender contained in a solid drawing material such as crayon. This is a solid drawing material containing talc as an extender,
Based on the fact that scaly talc can give bending strength because it is texture-oriented in one direction, and from the physical properties unique to talc, it can give properties such as good slippage and easy wear to the solid drawing material. I have.

[0003]

However, since talc is a natural mineral, it contains asbestos, which has recently been pointed out as having the potential to adversely affect the human body, depending on the place of production from which it is collected. There is something.

[0004] Therefore, talc containing no asbestos is usually selected and quality control is performed. However, since the operation is complicated, the extender is preferably stable in quality and excellent in safety. It is desirable to use On the other hand, a solid drawing material, particularly a bar-shaped paint such as crayon, is indispensable to have physical properties as a drawing material such as having bending strength, good slippage, and easy wear.

An object of the present invention is to confirm that there is no decrease in physical properties of a drawing material such as bending strength and slippage and that no asbestos is contained, as compared with a conventional one containing talc as an extender. The object of the present invention is to provide a solid drawing material which has no safety and is further excellent in safety.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, when plate-like alumina, plate-like alumina hydrate or mica is contained as an extender, scales are formed by molding in the same manner as conventional talc. The structure is oriented in one direction to exhibit bending strength, and exhibits slip (drawability) and ease of abrasion. It is not necessary to confirm that asbestos is not contained in the extender. Therefore, quality control work, which is a part of the production of solid drawing materials, is simple, and it does not include asbestos as in the case of conventional talc. I found it. The present invention is a solid drawing material containing plate-like alumina and / or plate-like alumina hydrate as an extender. Further, the present invention is a solid drawing material containing mica as an extender pigment.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The plate-like alumina, plate-like alumina hydrate and mica in the present invention are not particularly limited, but they are selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica. Any solid drawing material containing an extender pigment selected from at least one kind may be used as long as it exhibits the same bending strength and sliding (drawing property) as when talc is contained in the solid drawing material.

The plate-like alumina and / or plate-like alumina hydrate according to the present invention may be hexagonal plate-like or disk-like if the particles in the powder are substantially plate-like. The particles in the powder of plate-like alumina and / or plate-like alumina hydrate may not have a uniform shape due to pulverization.

The above-mentioned plate-like alumina and / or plate-like alumina
Hydrates are not particularly limited as polymorphs.
The plate-like alumina is α-Al₂O₃, Γ-Al₂O₃as well as
θ-Al₂O₃Singly or two or more selected from the group consisting of
The above mixture may be used, wherein the plate-like alumina hydrate is
α-Al₂O₃Hydrate, γ-Al₂O₃Hydrate and θ-
Al₂O₃Single or two selected from the group consisting of hydrates
The above mixture may be used, but the plate-like alumina and
// Use of plate-like alumina hydrate without pre-treatment
If the oil absorption is other plate-like alumina and plate-like aluminum
Α-Al lower than nahydrate₂O₃And / or α-A
l₂O₃Use of hydrates deteriorates strength
Relatively large amount of plate-like alumina during the blending of solid drawing material
Preferred because they can be used and are easy to disperse
No. When using plate-like alumina hydrate, plate-like aluminum
Na monohydrate and plate alumina dihydrate
Mina trihydrate may be used. The plate-like alumina
Γ-Al₂O₃, Θ-Al ₂O₃Either alone or
Is the case where these mixtures are used and
Γ-Al₂O₃Hydrate, θ-Al₂O₃No hydrate
When using any of these alone or a mixture thereof,
Although it is possible to use it as it is,
Surface is silane coupling agent or titanate coupling
Treated with a coupling agent such as
If α-Al₂O₃It can be suitably used similarly to.

The production method of the plate-like alumina and / or plate-like alumina hydrate is not particularly limited. For example, α-Al ₂ O ₃ and / or α-Al ₂ O ₃ hydrate may be used. If so, the aluminum hydroxide obtained by the Bayer method can be obtained by a method such as hydrothermal synthesis (350 ° C. or more and 200 atm or less) using a crystal inhibitor such as Na 2 SiO 3 after adjusting the particle size.

The particle size of the plate-like alumina and / or plate-like alumina hydrate is not particularly limited, but those having a particle size of 0.1 to 20 μm can be suitably used. The aspect ratio of the particles of the plate-like alumina and / or plate-like alumina hydrate is not particularly limited, but the plate-like alumina and / or plate-like alumina hydrate having an average value of 2 to 50 is used. The product powder can be suitably used. The aspect ratio is obtained by dividing the average diameter (μm) of the particles by the thickness (μm). The plate-like alumina and / or plate-like alumina hydrate is specifically exemplified by Cefra FYA00610 and Cefula FYA0202.
5. Sefura FYA10030 (all manufactured by YKK), Teraces BMN, Teraces BMN-B (all manufactured by Kawai Lime Industry Co., Ltd.) can be used.

The mica in the present invention is not particularly limited as long as it is in a powder form, and may not be subjected to a coating treatment or the like. Mica whose surface is coated with titanium oxide (so-called white mica, interference mica) And all known ones, such as iron oxide or colored mica coated with an organic pigment. The shape of the mica powder is preferably scale, and the size (particle size, thickness, etc.) is not particularly limited. In order to obtain the mechanical strength required for a solid drawing material, a laser diffraction method is used. Those having a thickness of 2 to 60 μm can be used. Specifically, A-11 (average particle diameter; 5.18 μm), A-16 (average particle diameter; 16.3)
9 μm), A-18 (average particle size; 18.95 μm),
A-21 (average particle size: 20.90 μm), A-31
(Average particle diameter: 33.40 μm), A-41 (average particle diameter: 39.97 μm), A-51 (average particle diameter: 45.
53 μm), A-61 (average particle diameter; 50.31 μm)
m), AB-32 (average particle size: 22.0 μm), A-
325 (average particle size: 41.94 μm), FA-500
(Average particle diameter; 17.9 μm), FA-400 (average particle diameter; 30.8 μm), FA-300 (average particle diameter; 5)
1.8 μm), A-500 (average particle diameter; 13.0 μm)
m) and A-400 (average particle diameter: 26.5 μm) (all manufactured by Mika Yamaguchi Co., Ltd.).

The plate-like alumina, plate-like alumina hydrate and mica in the present invention are used alone, but may be mixed. One or more extender pigments selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica are contained in an amount of preferably 2 to 60% by weight, and more preferably 3 to 55% by weight, based on the total amount of the solid drawing material. Is more preferable. If the solid drawing material contains more than 60% by weight of the extender pigment selected from the group consisting of plate-like plate-like alumina, plate-like alumina hydrate and mica, the coloring property is reduced, and When the amount is less than 2% by weight, the sliding of the solid drawing material (drawing property) at the time of drawing decreases, and the fixability to the image material also decreases, which is not preferable. The extender pigment selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica is at least one of plate-like alumina, plate-like alumina hydrate and mica. It may be composed of a plurality of different shapes, particle diameters, compositions, etc., and may be a mixture in which plate-like alumina, plate-like alumina hydrate and mica are each a mixture of plural kinds. There may be.

The solid drawing material of the present invention contains, as an essential component, at least one extender pigment selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica.
Wax and oil are included to constitute a solid drawing material.

The wax contained in the solid drawing material of the present invention is not particularly limited, but it is preferable that the wax is a solid that is melted at the time of heating and is solid at room temperature, and that has a small change in physical strength against impact due to temperature. As wax,
Examples include wood wax, beeswax, carnauba wax, hardened tallow oil, polyethylene wax, α-olefin oligomer, lard, paraffin wax and the like. As the wax, paraffin wax, hardened tallow oil, and carnauba wax are suitable.

The amount of the wax is preferably 20 to 80% by weight based on the total weight of the solid drawing material.
~ 75% by weight is more preferred. If the amount of the wax is less than 20% by weight based on the total weight of the solid drawing material, the strength of the solid drawing material is reduced, the moldability is reduced, and the adhesion (fixing property) is reduced. On the other hand, if the amount of the wax is more than 80% by weight based on the total amount of the solid drawing material, the color becomes transparent and thin.

The oil contained in the solid drawing material of the present invention is:
Although not particularly limited, those which are transparent and can be dissolved in wax are preferred. Examples of the oil include liquid paraffin, spindle oil, coconut oil, castor oil and the like, and it is more preferable to use liquid paraffin.

The amount of the oil is 3 to 20% by weight, preferably 5 to 15% by weight, based on the total amount of the solid drawing material. 3% by weight of oil based on the total weight of solid drawing material
If the amount is less, the slippage is reduced and the drawing property is reduced, and the adhesion is reduced. On the other hand, if the amount of the oil is more than 20% by weight based on the total amount of the solid drawing material, the strength decreases,
Heat resistance decreases.

In the solid drawing material of the present invention, a colorant can be used as necessary to adjust the color of the solid drawing material to various desired colors. The coloring agent has a coloring effect, and preferably has light resistance and heat resistance. Further, it is preferable that the coloring agent does not migrate to the surface of the wax by bleeding. In the present invention, a glittering solid drawing material containing no coloring agent is also included.

Specifically, the coloring agent includes acid dyes,
Water-soluble dyes such as direct dyes and basic dyes (triphenylmethane-based, xanthene-based, anthraquinone-based, metal complex-based, copper phthalocyanine-based, etc.), phthalocyanine, quinacridone, carbon black, and organic or inorganic pigments such as titanium oxide; Alternatively, a fluorescent pigment, a colored resin emulsion, or the like can be used. One or more colorants can be used as a mixture.

The amount of the colorant that can be used in the present invention is 3.5 to 45% by weight, preferably 4 to 35% by weight, based on the total amount of the solid drawing material. When the compounding amount of the coloring agent is less than 3.5% by weight, the coloring property is deteriorated and the coloring is deteriorated with respect to the total amount of the solid drawing material. ) Is undesirably reduced and the formation of a solid drawing material is not easy.

In the solid drawing material of the present invention, if necessary, a known extender other than plate-like alumina, plate-like alumina hydrate and mica in crayon or pass may be appropriately blended. As such extenders, the particle size is fine,
Those having good slipperiness (drawing properties) are preferable. When a colorant is contained in the solid drawing material, it is preferable that the solid drawing material further has a property of not hindering the coloring of the colorant. Specifically, magnesium carbonate, calcium carbonate, barium sulfate, kaolin, clay, and the like can be used as the extender, and one type or a mixture of two or more types may be used. . In addition, as an extender pigment, calcium carbonate (CI Pigment White 18),
Calcium sulfate (CI Pigment White)
25), silica (CI Pigment White)
27), magnesium carbonate (CI Pigment)
White 18), clay (CI Pigment)
White 19) is particularly preferred.

The blending amounts of known extender pigments other than plate-like alumina, plate-like alumina hydrate and mica contained in the solid drawing material of the present invention are as follows: plate-like alumina, plate-like alumina hydrate and extender other than mica The total amount of the pigment and the extender selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica is 2 to 60 with respect to the total amount of the solid drawing material.
%, Preferably 3 to 55% by weight. When the plate-like alumina and / or mica is contained in the solid drawing material in an amount of more than 60% by weight, the coloring property is reduced, and the formability is reduced.
On the other hand, if the amount is less than 2% by weight, the sliding (drawing property) of the solid drawing material at the time of drawing is reduced, and the fixability to the image material is also reduced, which is not preferable.

In the solid drawing material of the present invention, known additives such as crayon or pass can be appropriately compounded as other components as required.

In the method for producing a solid drawing material of the present invention, basically, the above components may be uniformly mixed. For example, in the case of blending a colorant, first, a wax, an oil, and a colorant (such as a pigment) are heated and melted using a kneader (such as a roll mill or a kneader) and mixed. Then, it is heated and melted, and at least one kind of extender pigment selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica, and if necessary, plate-like alumina, plate-like alumina hydrate and constitution other than mica By adding and mixing the pigment, a solid drawing material composition can be prepared. The solid drawing material composition is poured into a mold having a desired shape and solidified by cooling to obtain a solid drawing material having a specific shape. The solid drawing material such as a crayon or a pass of the present invention can be produced by using these components according to a known method for producing a crayon or a pass.

[0026]

EXAMPLE A colorant, a wax and an oil were kneaded under heat by using a roll mill or a kneader with the composition and blending amount (parts by weight) shown in Table 1, and then heated and dissolved to obtain plate-like alumina and plate-like. Alumina hydrate, mica, and plate-like alumina, a plate-like alumina hydrate and an extender other than mica are added, and the mixture is poured into a mold after heating and stirring, taken out after cooling, and the crayon of each of Examples and Comparative Examples is taken out. Obtained.

[0027]

[Table 1]

The following materials were used as the various raw materials in Table 1.

As the coloring material, a colored pigment (trade name: Hansa Yellow 10G, manufactured by Clariant) was used as the colorant A, and a colored pigment (trade name: Sanka Titanium FA-65, manufactured by Furukawa Kogyo) was used as the colorant B. . As the wax, wax A
As tallow hardened oil (trade name: Gyuushi IHF flake,
Paraffin (trade name: 135 ° F., Mobil Oil Co., Ltd.) was used as wax B. Liquid paraffin (trade name: liquid paraffin 80-S, manufactured by Chuo Kasei Co., Ltd.) was used as the oil. As the plate-like alumina, the trade name is Sefura FYA10030 and Y
The one manufactured by KK was used. As a mica, the product name is M
ica Powder A-11 manufactured by Mika Yamaguchi Corporation was used. As extender pigments, extender pigment A may include magnesium carbonate (trade name: Tansan magnesium Kimboshi,
Kamishima Chemical Co., Ltd., clay (trade name: SS clay, manufactured by Zikulite Chemical Co., Ltd.) was used as the extender pigment B, and talc (trade name: TALC SP-55, manufactured by Fuji Talc Co.) was used as the extender pigment C.

[Evaluation Test] Colorability, slippage and strength were evaluated by the following methods, and the results are shown in Table 2.

(Slipperiness) In the drawing taste test, when a solid drawing material was held by hand and a line was drawn on a drawing paper, a sample that felt resistance was evaluated as x, and a sample that could be drawn smoothly without resistance was evaluated as ○.

(Colorability) The crayon according to each Example and Comparative Example was written on a commercially available loose-leaf paper, and the colorability of each crayon was evaluated by visual observation according to the following criteria. ：: extremely good coloring. Δ: Good colorability. X: Poor colorability.

(Strength) The bending strength was measured in accordance with JIS-S-6026. That is, a load was applied to the central portion of the solid drawing material supported between both fulcrums, and the load when the solid drawing material was broken was measured and evaluated according to the following criteria. ：: The same strength as talc. ×: Inferior in strength to talc, not practical.

[0034]

[Table 2]

[0035]

The present invention is a solid drawing material containing at least one extender pigment selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica, so that asbestos is not included. And excellent safety. In addition, there is no decrease in physical properties as a drawing material such as bending strength, slippage, and abrasion as compared with a conventional pigment containing talc as an extender. Therefore, a practical solid drawing material excellent in safety can be provided.

Claims (4)

[Claims] 1. A solid drawing material containing plate-like alumina and / or plate-like alumina hydrate as an extender. 2. The method according to claim 1, wherein the plate-like alumina is α-Al ₂ O ₃ , γ
-Al ₂ O ₃ and θ-Al ₂ O ₃ , wherein the plate-like alumina hydrate is α-
Al ₂ O ₃ hydrate, _γ-Al 2 _{O 3} hydrate, and theta-Al
₂ O ₃ solid drawing material according to claim 1, wherein those selected one or more from the group consisting of hydrates. 3. A solid drawing material containing mica as an extender pigment. 4. An extender pigment selected from the group consisting of plate-like alumina, plate-like alumina hydrate and mica in an amount of 2 to 60% by weight and a colorant in an amount of 3.60% by weight based on the total amount of the solid drawing material.
The solid drawing material according to any one of claims 1 to 3, comprising 5 to 45% by weight, 20 to 80% by weight of wax, and 3 to 20% by weight of oil.