JPH05345655A - Light weight curing clay - Google Patents

Abstract

PURPOSE:To provide the light weight curing clay not generating the reduction in its volume even when an outer force is loaded on the clay. CONSTITUTION:The light weight curing clay comprises an aqueous clay containing the porous powder of a thermosetting resin as a main component and further containing fiber powder, inorganic powder, a sizing agent, water, a fine amount of a preservative, etc. The porous powder has many small pores in the particles and is composed of a cross-linked polyester having a particle diameter of 5-100mum. The employment of the porous powder as a main component permits to lighten the clay and to reduce the volume of the clay even when an outer force is loaded on the clay.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of clay used for work and the like, and more specifically to improvement of aqueous clay.

[0002]

2. Description of the Related Art Conventionally, since the weight of clay itself is heavy, when it is machined, it bends due to its own weight before the machined part hardens, and it requires labor for children as well as adults for transportation. There was a problem called.
Therefore, improvements have been made to reduce the weight of clay.
For example, in Japanese Patent Application Laid-Open No. 2-123390, a plurality of minute hollow bodies obtained by heat-expanding heat-expandable particles in which a volatile expander is included in a thermoplastic polymer shell are constituted as main components of clay. What you have done is proposed. The measured bulk specific gravity of the clay thus produced is about 0.28 (by the fixed specific gravity measuring method based on JIS-Z8807), and the weight of the clay is reduced.

[0003]

However, since the inside of such a micro hollow body is hollow, even if the shell itself constituting the micro hollow body has elasticity, the manufacturing process and the manufacturing process are difficult. When an external load is applied to the clay during the process, some of them will be destroyed as shown in Fig. 3. As a result, there is a problem in that the volume of clay is reduced, which impairs weight reduction. It should be noted that FIG. 3 is a micrograph at a magnification of 700 showing the particle structure of the fine hollow body disposed and destroyed in clay.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a completely new lightweight cured clay which does not decrease in volume even when an external load is applied to the clay. is there.

[0005]

The present invention solves the above-mentioned problems by providing a novel lightweight hardening clay composed mainly of a porous powder composed of a thermosetting resin.

[0006]

In the present invention, the main component is porous powder made of thermosetting resin. Since this porous powder is composed of a large number of vesicles 2 ... 2 in the particle 1 as shown in FIGS. 1 and 2, the weight of the entire clay can be reduced. Moreover, the elasticity of each particle 1 formed by the vesicles 2 ... 2 can prevent the particle 1 from being destroyed even when an external load is applied. As a result, it is possible to prevent a decrease in volume even when an external load is applied to the clay during the manufacturing process or the working process.

A detailed description will be given below. The light-weight hardened clay of this example is mainly composed of a porous powder made of a thermosetting resin, and a fiber material, an inorganic powder, a sizing agent, water, and a material for an aqueous clay such as a trace amount of a preservative. Is appropriately selected and used.

As shown in FIGS. 1 and 2, a porous powder made of a thermosetting resin generally comprises a plurality of particles 1 ... 1 having a particle diameter R of about 1 mm or less. There are a large number of vesicles 2 ... 2 inside. Figure 1
Is a micrograph showing the particle structure of the porous powder at a magnification of 500, and FIG. 2 is an explanatory diagram thereof. The size of this particle size can be adjusted appropriately.

Since this porous powder is composed of a large number of vesicles having a thermosetting resin as a partition wall, it has elasticity to an external load and is hard to be destroyed, and it is resistant to heat, water and water. It has high chemical properties and does not cause strength reduction even if it absorbs fragrance, oxygen, etc. Further, it is characterized in that it is easily dispersed in paints, adhesives, rubber and the like. On the other hand, this porous powder can be produced as a water slurry or a dry powder in which vesicles contain water, and can be blended with clay in either a water slurry or a dry powder state.

In this embodiment, the porous powder is composed of a crosslinked polyester having a particle size of 5 to 100 μm. This is because if the particle size is 5 or less, the efficiency of lightweight clay cannot be improved, while if it is 100 or more, the clay becomes brittle. The blending amount is 30 to 8
The range of 0% by weight is preferable, and if it is 30% by weight or less, weight reduction cannot be achieved, while if it is 80% by weight or more, the plasticity of clay is impaired.

Examples of the fiber powder include wood pulp and synthetic pulp. And, the compounding amount thereof is preferably in the range of 1 to 20% by weight. If it is 1% by weight or less, cracking tends to occur after drying the clay, while if it is 20% by weight or more, shrinkage during drying becomes large.

The inorganic powder is composed of powder of magnesium carbonate, calcium carbonate and the like, and the compounding amount thereof is 5
The range of ˜50% by weight is preferred. When it is 5% by weight or less, the plasticity of the clay is lost, while when it is 50% by weight or more, the product becomes brittle after drying.

As the sizing agent, any water-soluble synthetic resin agent such as CMC (carboxymethyl cellulose) or PVC (polyvinyl alcohol) can be used. The blending amount is
It is preferably in the range of 1 to 20% by weight, and below 1% by weight,
The plasticity of clay is lost, while if it is 20% by weight or more, the clay becomes sticky and the workability deteriorates.

The water content is 30 to 80% by weight at the time of manufacture. If it is 30% by weight or less, the plasticity of the clay is lost, while if it is 80% by weight or more, the clay becomes sticky and the workability is deteriorated.

As described above, when the porous powder made of a thermosetting resin is used as a main component, the specific gravity of clay can be reduced and the weight can be reduced. Moreover, since each particle has elasticity formed by the vesicles 2 ... 2, it is possible to prevent the particle 1 from being destroyed even when an external load is applied. Therefore, it is possible to prevent a decrease in volume even if an external load is applied to the clay during the manufacturing process, the working process, or the like.

[0016]

EXAMPLES Specific examples will be shown below. Example 1

[0017]

[Table 1]

Example 2

[0019]

[Table 2]

In these Examples 1 and 2,
The porous powder was white in appearance, had an apparent specific gravity of 2.8 mL / g, a particle porosity of 65 to 70%, and a particle density of about 0.55. The measured bulk specific gravity of the clay obtained in Example 1 is about 0.2.
8 (according to JIS-Z8807-based fixed specific gravity measuring method), and the bulk specific gravity measured value of the clay obtained in Example 2 was about 0.22 (according to the same method).
Therefore, compared to conventional ones that use a micro hollow body as the main component,
It was the same or less, and the weight could be further reduced.

Next, a comparative test for investigating the reduction in volume of the clay of the present invention and the conventional clay containing a micro hollow body as a main component was conducted, and the results are shown in Table 3. This comparative test is generally performed by three types of machines, namely, a stirrer, a kneader, and a clay kneader when producing clay, so the volume after kneading with these machines should be changed to the original volume before kneading. It is done by investigating how much it decreases.

[0022]

[Table 3]

In Table 3, is the volume reduction rate relative to the original volume after kneading with a stirrer,
Indicates the volume reduction rate relative to the original volume in the state after kneading with a stirrer and further kneading with a kneader,
Shows the rate of decrease of the volume with respect to the original volume in the state after kneading by two machines of a stirrer and a kneader and further after kneading by an earth kneader. As shown in Table 3, the clay of the present invention showed no decrease in volume even after being kneaded by three machines (in Table 3), but the conventional clay containing a micro hollow body as a main component was The volume decreased with each kneading with each machine, and finally a volume reduction of 16% was observed compared to the original volume. That is, in the conventional clay, some of the micro hollow bodies in the clay were cracked during the manufacturing process as shown in FIG. 3, and as a result, the volume was reduced by 16%.

[0024]

As described above, since the lightweight hardened clay of the present invention contains the porous powder made of a thermosetting resin as a main component, the weight of the clay can be reduced by the porous powder. Moreover, it is possible to prevent the particles of the porous powder from being broken even when an external load is applied. Therefore, it is possible to prevent a decrease in volume even if an external load is applied to the clay during the manufacturing process, the working process, or the like. As described above, the present invention can provide a light-weight hardened clay that does not decrease in volume even when an external load is applied to the clay.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of FIG.

FIG. 3 is a micrograph showing the particle structure of a conventional micro hollow body composed of heat-expandable particles.

[Explanation of symbols]

 1 particle 2 vesicle

Claims (1)

[Claims] 1. A light-weight hardened clay comprising a porous powder composed of a thermosetting resin as a main component.