JP2592751B2 - Lightweight oil clay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an oil clay used for a work or the like.

[0002]

2. Description of the Related Art Conventionally used oil clays for working and the like have a problem that, because of the heavy weight of the oil clay itself, the machined parts are bent by their own weight during the work. . Also, for transportation, of course to children,
There was a problem that labor was also required for adults. On the other hand, JP-A-2-123390 proposes a lightweight clay. This lightweight clay is made by blending a plurality of micro hollow spheres in which the entire inside is hollowed out by heating and expanding thermally expandable particles containing a volatile expanding agent in a thermoplastic polymer shell. is there. However,
In this clay, the entire inside of the micro hollow sphere is hollowed out, so even if the micro hollow sphere itself has a certain degree of elasticity, the outer shell of the micro hollow sphere is destroyed when an external load is applied For example, when an external load is applied in a manufacturing process or a machining process, some of them are destroyed. As a result, there is a problem that the volume of the clay is reduced in the manufacturing process, the working process, and the like, and the weight is impaired. Also, in the case of oil clay, since it is repeatedly worked, even if the outer shell of the micro hollow sphere is not destroyed by one work,
If it is repeatedly machined, it will be subjected to an external load repeatedly, and the volume of the clay will gradually decrease every time the machine is machined, impairing the weight reduction. Therefore, such minute hollow spheres are not suitable for reducing the weight of oil clay.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned circumstances, and an object thereof is to reduce the weight even when an external load is applied in a manufacturing process, a machining process, or the like. It is an object of the present invention to provide a light-weight oil clay which is not damaged.

[0004]

Means for Solving the Problems As a result of diligent research, the present inventors have found that a porous powder composed of a thermosetting resin containing a large number of small bubbles having small pores in particles is easily dispersed in oil clay. The present invention was completed by finding that it was possible and blending it with clay.

The present invention solves the above problems by providing a lightweight oil clay having the following characteristics. The lightweight oil clay of the present invention is selected from at least one selected from mineral oil and synthetic oil, an appropriate amount of fatty acid, and metal-based and non-metal-based oxides, carbonates, sulfates, and fine powders of carbon materials. The main components are at least one of the above and a porous powder made of a thermosetting resin. The porous powder is composed of a plurality of particles 1. Each of the particles 1 has a number of vesicles 2... 2 formed by partition walls made of a thermosetting resin in the particle 1.

At least one selected from mineral oil and synthetic oil used in the lightweight oil clay of the present invention preferably has a kinematic viscosity at 40 ° C. of 20 to 10,000 cst and an average molecular weight of 250 to 10,000.

As the fatty acid, a saturated fatty acid, an unsaturated fatty acid, or the like can be used, and has the properties of 8 to 30 carbon atoms, a melting point of 20 to 80 ° C., a neutralization value of 100 to 300 mg KOH / g, and an iodine value of 0.01 to 100. Those are preferred.

[0008] In producing a lightweight oil clay, a suitable amount of the fatty acid is mixed with at least one selected from the mineral oil and the synthetic oil and reacted to produce a grease-like substance. Substances are 3
It is preferably produced by reacting and kneading in a temperature range of 0 ° C. to 300 ° C. The amount of the fatty acid to at least one selected from mineral oil and synthetic oil is 10 to 10 parts by weight per 100 parts by weight of mineral oil or the like.
0 parts by weight.

Next, the obtained grease-like substance is mixed with a mixture of two or more kinds of fine powders of metal-based and non-metal-based oxides, carbonates, sulfates, and carbon materials. The lightweight oil clay of the present invention can be obtained by kneading with a porous powder made of a curable resin, deaeration, aging, and molding.

The metal group or nonmetal group of metal and nonmetal oxide, carbonate or sulfate mixed with the grease-like substance is Ca, Si, Li, Mg, K,
Na, Fe, Cu, Ti, Ba, Pb, and Zn alone or as a mixture of two or more. The compounding amount is from 50 parts by weight to 100 parts by weight based on 100 parts by weight of the grease-like substance.
0 parts by weight is preferred.

As shown in FIGS. 1 and 2, a porous powder made of a thermosetting resin generally comprises a plurality of particles 1 having a particle diameter R of about 1 mm or less. .. 2 exist in a large number. Here, FIG. 1 is a photomicrograph at 500 magnifications showing the particle structure, and FIG. 2 is an explanatory diagram thereof. As general properties of the porous powder, the appearance is self-colored, the apparent specific gravity is 2.8 mL / g, the particle porosity is 65 to 70%, and the particle density is about 0.55. . And, since it is composed of a large number of vesicles having a thermosetting resin as a partition wall, it is hard to be broken by an external load, and has high heat resistance, water resistance, chemical resistance, and absorbs fragrance, oxygen, etc. Does not cause a decrease in strength. Furthermore,
It has features such as easy dispersion in oil clay and the like. on the other hand,
This porous powder is safe and harmless because it is a copolymer.

In this embodiment, the porous powder is composed of a crosslinked polyester having a particle diameter R of 5 to 100 μm. If the particle diameter is 5 or less, the efficiency of the oil clay cannot be reduced in weight, while if it is 100 or more, the clay becomes brittle. Also, the amount is from 50 parts by weight to 100 parts by weight of the grease-like substance.
0 parts by weight is preferred. If it is 50 parts by weight or less, weight reduction cannot be achieved, while if it is 1000 parts by weight or more, the plasticity of the clay is impaired.

By mixing a predetermined amount of such a porous powder composed of particles 1 having a large number of vesicles 2... The weight can be reduced. On the other hand, for example, it is also conceivable to mix a plurality of micro hollow spheres obtained by thermally expanding thermally expandable particles containing a volatile expander in a thermoplastic polymer shell into clay to reduce the weight of oil clay. However, in this case, since the entire inside of the micro hollow sphere is hollowed out, even if the micro hollow sphere itself has a certain degree of elasticity, if an external load is applied in a manufacturing process, a machining process, etc. Some will be destroyed. As a result, the volume of the clay is reduced in the manufacturing process, the working process, and the like, which causes a problem that weight reduction is impaired. However, by blending the porous powder having a large number of vesicles 2... 2 in the particle 1 into the clay as in the present invention, even if the particle 1 is subjected to an external load, a large number of vesicles Since each of the particles 1 is not destroyed by the elasticity formed by 2... 2, the initial volume of the oil clay can be maintained during the manufacturing process and the work.

[0014] Mineral oil and synthetic oil are harmless if they are highly refined, because they contain very little aromatic hydrocarbons. In addition, metal-based and non-metal-based additives, for example, calcium carbonate, are nontoxic when used as food additives. Therefore, the oil clay of the present invention can be formed to be safe and harmless by mixing the above-mentioned raw materials.

[0015]

The present invention will be described below with reference to specific examples. Example 1 Refined mineral oil (kinematic viscosity at 40 ° C. 120 cs)
t, average molecular weight 530, CA 3%) 100 parts by weight, and saturated or unsaturated fatty acid (melting point 50 ° C., neutralization value 100 mg KOH / g, iodine value 2 g iodine / 60 g) 5
0 parts by weight, heated to 60 to 70 ° C. and stirred,
After heating to ~ 100 ° C to complete the reaction,
After evaporating and removing water generated by the reaction at a temperature of 20 to 130 ° C., the heating is stopped and the mixture is allowed to cool.

After cooling, the obtained substance was rolled on a roller to obtain a grease-like substance having a uniform viscosity composed of the above fatty acid and mineral oil. Next, the obtained grease-like substance 10
0 parts by weight, natural clay (SiO ₂ 75%, AL ₂
O 20%, other 5%) and 150 parts by weight of the porous powder were sufficiently mixed, kneaded, and deaerated to obtain an oil clay. At that time, the porous powder used had a white appearance, an apparent specific gravity of 2.8 mL / g, a particle porosity of 65 to 70%, and a particle density of 0.55.
And the specific gravity of the obtained oil clay was 1.0.

EXAMPLE 2 Refined mineral oil (kinematic viscosity at 40 ° C. 80 cst,
A mixture of 80 parts by weight of an average molecular weight of 400) and 20 parts by weight of a poly-α-olefin-based synthetic oil (average molecular weight of 1,000) is reacted with sodium polyfatty acid having 16 to 20 carbon atoms to produce 30 parts by weight of a fatty acid aluminum produced by a double decomposition method. The mixture is added and stirred at 150 ° C. to 170 ° C. for 30 to 60 minutes to completely dissolve. After the dissolution, the mixture was allowed to cool for several hours, and then the material was rolled to obtain a grease-like substance having a uniform consistency consisting of fatty acid aluminum, fatty acid sodium, mineral oil and synthetic oil. Next, 200 parts by weight of calcium carbonate and 200 parts by weight of porous powder were blended with 100 parts by weight of the obtained grease-like substance, sufficiently kneaded, and deaerated and aged to obtain an oil clay. At that time, the porous powder used had a white appearance and an apparent specific gravity of 2.
8 mL / g, the particle porosity was 65 to 70%, and the particle density was 0.55. And the specific gravity of the obtained oil clay was 0.5.

[0018]

As described above, the oil clay of the present invention can be reduced in weight by a porous powder having a large number of vesicles formed by partitions formed of thermosetting resin in the particles.
In addition, even when an external load is applied to the clay during a manufacturing process, a working process, or the like, each particle of the porous powder is not broken, and the volume of the entire oil clay can be maintained.

[Brief description of the drawings]

FIG. 1 is a micrograph showing the particle structure of a porous powder.

FIG. 2 is an explanatory diagram of FIG.

[Explanation of symbols]

 1 particle 2 vesicle

Claims (1)

(57) [Claims] At least one selected from mineral oil and synthetic oil, an appropriate amount of fatty acid, and at least one selected from metal and non-metal oxides, carbonates, sulfates, and fine powders of carbon materials. One type and a porous powder made of a thermosetting resin as a main component, and the porous powder is composed of a plurality of particles (1), and each of the particles (1) has a heat inside the particle (1). A lightweight oil clay comprising a plurality of vesicles (2) formed by partition walls made of a curable resin.