JPH0726278A - Production of block or metal salt of higher fatty acid - Google Patents

Abstract

PURPOSE:To produce a block without cracking when molded even if in flat plate form of high aspect ratio or cylindrical form by cooling and solidifying a molten metal salt of a higher fatty acid in a mold gradually from the lower part to the upper part. CONSTITUTION:This block is produced by cooling and solidifying a molten metal salt of a higher fatty acid (e.g. zinc stearate) in a mold gradually from the lower part to the upper part. By this technique, a good molded block of a metal salt of a higher fatty acid can be obtained without the trouble of cracking even if it is a flat plate molding of high aspect ratio or cylindrical molding. The obtained metal salt block is very effectively used as a lubricant, a cleaning aid, etc., for, e.g. business machines, such as an electrostatic copier, and other precision instrument.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a higher fatty acid metal salt block used as a lubricant in office machines such as electrostatic copying machines and other precision equipment.

[0002]

2. Description of the Related Art Generally, in office machines such as electrostatic copying machines,
Higher fatty acid metal salts are used as lubricants, abrasives, cleaning aids or development aids. Since the higher fatty acid metal salt is finally used in the form of powder, it has been adopted to store it in the used equipment in the form of powder and supply it to necessary places, but it requires a large storage space. Since there is a problem that it is difficult to feed a small amount of quantitatively, a method has been proposed in which a higher fatty acid metal salt is blocked in advance and scraped off with a brush or the like and supplied to a required location.

On the other hand, a powder pressing method and a melt solidification method can be considered as a method for molding a block of a higher fatty acid metal salt. In the powder pressing method, however, the addition of a binder is essential in order to eliminate the brittleness of the molded product. However, this addition reduces the original function of the higher fatty acid metal salt. For this reason, the melt solidification method is preferable, but this also has a problem that the shrinkage is large during the solidification process, and in particular, a molded product having a large aspect ratio or a molded product having an irregular shape is cracked and broken.

[0004]

In view of the above situation, according to the present invention, a higher fatty acid metal salt block can be produced without cracking at the time of molding even if it has a flat aspect or a column shape having a large aspect ratio. It was made in an attempt to provide a melting and solidifying method.

[0005]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the inventors of the present invention can solve the problems by controlling the cooling method after the molten higher fatty acid metal salt is poured into the mold. Therefore, the present invention has been completed and the present invention has been completed. That is, the present invention is to solve the above problems, a method for producing a higher fatty acid metal salt block, which comprises sequentially cooling and solidifying a higher fatty acid metal salt in a molten state from a lower part to an upper part, Is the gist.

The present invention will be described in detail below. As the mold used in the present invention, it is preferable to use a metal mold (hereinafter simply referred to as a mold) because it has a high temperature during use and is required to have thermal conductivity and strength. It is preferable that the material of the mold has good workability and thermal conductivity, is easy to handle, is inert to the higher fatty acid metal salt, and has little surface adhesion.

Most of the higher fatty acid metal salt blocks are rod-shaped and have a large aspect ratio in terms of their applications, and the production thereof will be described. First, an example of a preferable shape and structure when a mold is used for this manufacturing will be described. The mold is a flat split mold, and a desired number of grooves having a size and shape corresponding to a rod-shaped product are provided on one or both of the dividing surfaces. The mold should be installed so that the dividing surface is almost vertical or slightly inclined, and the longitudinal direction of the groove (product) is also at the same position, and it is used when pouring a separately melted higher fatty acid metal salt. An opening communicating with the groove is provided on the upper surface of the mold. FIG. 1 shows an example of such a mold. Also, since the higher fatty acid metal salt is cooled and solidified sequentially from the bottom to the top, it is possible to install a heater so that a temperature gradient can be applied in the vertical direction of the mold, or to prepare a lid with a heater. ,
Further, in addition to the heater mounting mechanism, it is advisable to provide a cooling mechanism such as water flow in the lower part of the mold or on the mold stand.

When using the mold, it is advisable to arrange a plurality of molds (FIG. 2) and set them with a fastener (FIG. 3). In this case, it is needless to say that both sides of one die piece can be used as shown in these figures. An example of the manufacturing procedure is as follows. After heating the entire mold in advance to the melting temperature of the higher fatty acid metal salt, pouring the molten higher fatty acid metal salt and continuing heating for a few hours, do not forcibly cool it in particular, or lower it or the mold stand In parallel with this, the heating of the heater is stopped in order from the lower part, and the solidified product of the higher fatty acid metal salt is gradually piled up from the lower part to form it. After the temperature of the whole mold is below 40 ℃, open the mold and take out the product.

The method of the present invention can be applied to any of higher fatty acid metal salts conventionally used as lubricants and cleaning aids, for example, alkali metal salts such as stearic acid and palmitic acid, and alkaline earth metal salts. , Transition metal salts, and the like. Of these, it is also suitable for general-purpose zinc stearate. Furthermore, the method of the present invention is also very effective when producing a block-shaped molded product such as a high-melting-point wax or a high-melting-point bisamide.

[0010]

EXAMPLES The present invention will be specifically described based on examples and comparative examples, but the present invention is not limited to the examples. Example 1 Width 20 mm, depth 4 mm, length on one side of a thick aluminum plate
400 mm groove sandwiches the tightening bolt holes, 5 on each side, 10 in total, 10 dies, 3 heater insertion plates, and 1 flat plate, and the groove surface is the plane of the other dies. Assembled in such a manner that they were tightened together, and a set of dies capable of forming a total of 100 blocks was set on a die stand equipped with a heater insertion port and a cooling mechanism (methods in FIGS. 2 and 3). Further, a total of 13 sheath heaters were installed on the upper, middle, and lower parts of the mold, respectively, and for heat insulation, two cover heaters and two mold heaters, respectively, were installed in total. 1 for each part by heater
Separately melted at 180 ℃ in a mold heated to 60-200 ℃,
The degassed zinc stearate melt was poured and a heat-insulating lid plate heated to 150 ° C. with a heater was placed. 30 minutes after injection,
Stop heating the mold holder heater, start passing water at a rate of about 1 L / min, stop heating by the lower heater, and then stop heating by the upper heater in sequence every 1 hour.
It was allowed to cool until the temperature of the entire mold became 40 ° C or lower. Then, the mold was opened to obtain a zinc stearate compact. All the molded products can be put to practical use without cracks,
The yield was 100%.

Example 2 The same mold and mold stand as in Example 1 were used, the mold was heated as in Example 1, and zinc stearate was also used in Example 1.
It was injected in the same manner as in. Two hours after the injection, the heating by the lower heater was stopped, and thereafter, the heating by the middle heater was sequentially stopped every 1 hour and 30 minutes. During this time,
Water was not passed through the cooling mechanism. After allowing the whole mold temperature to cool to 40 ° C. or lower, the mold was opened to obtain a zinc stearate compact. In this case as well, all of the molded products could be put to practical use without cracks, and the yield was 100%.

Comparative Example 1 The same mold as in Example 1 was used, but a slate plate was used in place of the mold stand provided with a cooling mechanism to prevent the cooling effect from below. The mold was heated as in Example 1, and zinc stearate was also injected as in Example 1. But,
Immediately after the injection, all the heaters were turned off, heating of the mold was stopped, and the mold was allowed to cool until the temperature of the whole mold was 40 ° C or lower. After that, the mold was opened, but all the zinc stearate compacts were cracked and broken apart.

[0013]

According to the production method of the present invention, even in the case of a flat plate-shaped or columnar molded product having a large aspect ratio, a good block-shaped higher fatty acid metal salt molding can be carried out without causing troubles of crack generation. You can get the body.
The obtained higher fatty acid metal salt block is very effectively used as a lubricant, a cleaning aid, etc. in office machines such as electrostatic copying machines and other precision equipment.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a mold used in the present invention.

FIG. 2 is a perspective view showing an example of a combination (assembly) of molds used in the present invention.

FIG. 3 is a perspective view showing a state where the combination of FIG. 2 is tightened by a tightening tool.

[Explanation of symbols]

 1 Upper Heater Insertion Port 2 Middle Heater Insertion Port 3 Lower Heater Insertion Port 4 Temperature Sensor Insertion Port 5, 5'Note, Drainage Port 6 Mold Holder 7 Clamp

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area G03G 9/107 // C10N 10:04 40:06 50:08 70:00

Claims (1)

[Claims] 1. A method for producing a higher fatty acid metal salt block, which comprises successively cooling and solidifying a higher fatty acid metal salt in a mold in a molten state from the lower part to the upper part.