JPS6051765A - Solid drawing material - Google Patents

Abstract

PURPOSE:To provide a solid drawing material which has excellent breaking strength and scarcely causes blurring, consisting of glycerol tristearate (derivative), low-molecular PE, a fatty acid ester, a mineral oil and a pigment. CONSTITUTION:1-20wt% fatty acid ester having a m.p. of 50-69 deg.C such as hardened fish oil, 10-20wt% mineral oil such as liquid paraffin and 3-25wt% pigment such as carbon black are mixed together under heating at 50-100 deg.C and then kneaded at 80-110 deg.C. While keeping the temp. at 80-110 deg.C, 10-30wt% glycerol tristearate (derivative), 7-25wt% low-molecular PE having a m.p. of 80-120 deg.C and optionally a filler, a reinforcement, etc. are mixed therewith and the resulting mixture is molded into the desired shape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid drawing material such as a crayon or a pass, and more particularly to a solid drawing material using low molecular weight polyethylene.

Conventionally, low-molecular-weight polyethylene has been inexpensive and suitable for suppressing the generation of scraps in solid drawing materials, but solid drawing materials using low-molecular-weight polyethylene have reduced breakage strength due to rapid cooling during molding. This problem has made it difficult to use it for solid drawing materials that require mass production.

Therefore, as a result of intensive research to resolve the above-mentioned conventional problems, the inventors of the present invention discovered that by using stearic acid triglyceride or its derivatives in combination with low-molecular-weight polyethylene,
The present invention was completed based on the discovery that a solid drawing material using low-molecular-weight polyethylene that significantly suppresses a decrease in breakage strength can be obtained.

That is, the present invention provides a solid drawing material comprising at least stearic acid triglyceride or its derivative, low-molecular-weight polyethylene with a melting point of 80 to 120°C, a fatty acid ester with a melting point of 50 to 69°C, mineral oil, a pigment, and carbon. The main points are as follows.

Next, each component will be explained in detail.

Stearic acid triglyceride or its derivatives are mainly used to suppress the rapid crystallization of low-molecular-weight polyethylene by cooling and to prevent a decrease in the breaking strength of the drawing material.Specific examples include stearic acid triglyceride,
Hydroxystearin contains triglycerides, etc. If the amount used is too large, the touch becomes hard, and if too little is used, the breakage strength decreases, so 10 to 30
Weight percent is preferred.

Low molecular weight polyethylene has a melting point of 80-120°C.

It is mainly used to prevent the generation of scum during drawing. If the amount used is too large, the touch will become hard, and if it is rapidly cooled during molding, the breakage strength will decrease.

In addition, if the amount is too small, it may not be possible to suppress the generation of debris, so it should be added in an amount of 7 to 25% by weight based on the total amount of the drawing material.
is preferred.

Fatty acid esters with a melting point of 50-69°C mainly improve the dispersibility of pigments and give smoothness during drawing.

Specific examples of materials used to improve color development include hydrogenated fish core oil and hydrogenated beef tallow oil. The amount used is preferably 1 to 20% by weight based on the entire lid.

Mineral oil is mainly used to control viscosity when kneading materials, impart smoothness during drawing, and increase concentration, and specific examples thereof include liquid paraffin and petrolatum. The amount used is 10 to 20% of the total amount of the drawing material, because if it is too large, the drawing surface may become sticky, and if it is too small, the smoothness of drawing may be impaired or the density may decrease. Weight percent is preferred.

The pigment is used as a coloring material, and various conventionally known pigments such as carbon black, Nyanin blue, Wanotin glen, Hansa yellow, etc. can be used. Part 1: Historical ηC varies greatly depending on the color, but if you take into account the color development and intensity, generally speaking, the total amount of drawing material is filled with ηC. I~25% by weight is used.

In addition to the above composition, talc,
Add calcium 7um carbonate, clay, crushed stone, etc. as appropriate,
Distearyl ketone, carnauba wax, wood wax, halaffin wax, which is conventionally used as an extender or to give smoothness during drawing, and to prevent deformation of the drawing material due to temperature changes. Wax such as microcrystalline wax can also be polished as appropriate.

The drawing material must contain the above-mentioned drawing composition components in an amount of 6% of the object to be used.
The material should be selected and used as appropriate depending on the characteristics and the like, and an example of its manufacturing method is as follows.

First, a fatty acid ester with a melting point of 50 to 69°C, an animal oil, and a pigment are stirred and mixed (in order to improve the dispersibility of the pigment, it is preferable to heat the mixture to 50 to + 0 o'c; then, After kneading the mixture using a kneader such as an attriter or a three-roll kneader, the kneaded product is heated (preferably 8
0-110'CJ. Thereafter, while maintaining the heating temperature (preferably 80 to 110°C), add stearic acid triglyceride or its derivative to the mixture at a temperature of 80 to 120°C.
The desired drawing material can be obtained by adding low-molecular polyethylene and other materials used as necessary, stirring, and then appropriately molding.

An example of the present invention will be described below regarding a crayon, but the solid drawing shrine of the present invention is not limited to these examples. In addition, "parts" in the examples indicate "parts by weight."

Example 1 Fatty acid ester (hardened beef tallow, melted Point 60’C) 60 copies Mineral oil (liquid paraffin) 45 parts Pigment (carbon black) 24 parts Low molecular weight polyethylene (, BAI (, EC0500).

Melting point 86'C, 1) BTROLITE Co, )
60 parts castor/hydrogenated oil (12-hydroxystearinated triglycerides).

Melting point: 85°C] 75 parts In the above formulation, hydrogenated beef tallow oil, mineral oil, and pigment were heated at 70°C.
The mixture was stirred and mixed for 10 minutes using a mixer while heating to 2. Next, the mixture was kneaded for 50 minutes using three rolls, and while maintaining the hindlimb kneaded product at 100"C, low molecular polyethylene and castor hydrogenated oil were added. After stirring with a mixer for 30 minutes, the mixture was poured into a mold maintained at 30'C, and after 30 seconds, the mixture was cooled with water at 215C to obtain a black crayon with a diameter of 105 mm.

Comparative Example 1 During the formulation of Example 1, hydrogenated castor oil was removed and low molecular weight polyethylene was increased by the same amount.
A black crayon was obtained in the same manner as above.

Example 2 Fatty acid ester (hardened fish fat oil, melting point 55°C) 60 parts Mineral oil (liquid paraffin) 45 parts Pigment (Wanoting resin) 50 parts Molecular polyethylene (BA⇠EOO655, melting point 102)
'C, PETR0LITE Co, Castle) 60 parts castor hydrogenated oil (12-hydroxystearic acid triglyceride 2, melting point 85°C) 75 parts filler (talc) 65 parts A red crayon was made using the same method as in Example 1 with the above composition. I got it.

Comparative Example 2 A red crayon was obtained in the same manner as in Example 2, except that during the formulation of Example 2, castor 7 hydrogenated oil was removed and low molecular weight polyethylene was increased by the same amount.

Examples 1 and 2 above. As shown in JIS S-6026 for the crayons obtained in Comparative Examples 1 and 2, the solid drawing material of the present invention has significantly higher breakage strength than the conventional solid drawing material using low-molecular-weight polyethylene. improved to
This makes it easy to use low-molecular polyethylene, and as a result, a solid drawing material with less dregs can be obtained.

Patent applicant: Bentel Co., Ltd.

Claims (1)

[Claims] Stearic acid triglyceride or its derivative and melting point 8
Low molecular weight polyethylene with a temperature of 0~120'C and a melting point of 50~
A solid drawing material consisting of at least a 69°C fatty acid ester, mineral oil, and a pigment.