JP3076538B2 - Water resistant clay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-resistant clay, and more particularly to an improvement of a water-resistant clay used for teaching materials in schools.

[0002]

2. Description of the Related Art So-called paper clay has been known as a clay used for teaching materials in schools. This conventional paper clay is composed mainly of inorganic powder, which contains sizing agent, pulp, and even preservatives. After being made as a work, it is hardened and solidified by drying. , Can be displayed in a classroom or the like. However, since this conventional paper clay contains an inorganic powder as a main component and a sizing agent, pulp, and the like, it does not have water resistance. Therefore, it is good to decorate it indoors, such as in a classroom, but if it is decorated outdoors and it is exposed to rain or the like, the shape will collapse and the work itself will change. Also, if the water resistance is good, for example, after making works of various shapes, it is also possible to use the work as a fountain by blowing water from the inside of the work, but with conventional paper clay. Such use is difficult due to lack of water resistance.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above circumstances, and it is an object of the present invention to provide a clay for a work which is excellent in water resistance and which can be used as a fountain and which can be used outdoors or as a fountain. The purpose of.

A second object of the present invention is to provide a clay for works which has good water resistance and is lightweight and can be floated on water.

[0005]

The present invention solves the above-mentioned problems by providing a water-resistant clay having the following characteristics. The clay of the first invention of the present application is a water-resistant clay characterized by having an inorganic powder as a main component and containing polyamide epichlorohydrin and / or polyamide epoxy.

[0006] The clay of the second invention of the present application is composed of 100 inorganic powders.
~ 700 parts by weight, 1 to 70 parts by weight of sizing agent, and pulp 5
100 parts by weight of polyamide epichlorohydrin and / or
Or a water-resistant clay characterized by being blended with 1 to 70 parts by weight of a polyamide epoxy.

[0007] The clay of the third invention of the present application is characterized in that the clay according to the first or second invention of the present application is made to be light-weight having a specific gravity of 1 or less, so that it can be floated on water. It is a characteristic water-resistant clay.

[0008] The clay of this embodiment is formed by mixing a water-soluble synthetic polymer resin, a sizing agent, pulp, water, and a small amount of a preservative into inorganic powder.

The water-soluble synthetic polymer resin has a pale yellow transparent appearance, is excellent in water-resistant paper strength, dry paper strength, solubility, etc., and has been conventionally used as a wet-wet paper strength enhancer (for internal use). It is used for paper and banknotes. Examples of the water-soluble synthetic polymer resin include polyamide, polyacrylamide, acrylamide, polyacrylamide, polyamide epichlorohydrin, polyamide epoxy, and the like, and one or more of these can be used. As the compounding amount of the water-soluble synthetic polymer resin,
The amount is preferably 1 to 70 parts by weight with respect to the inorganic powder, the sizing agent, and the pulp, and when the amount is 1 part by weight or less, the water resistance effect is reduced. As a result, the sculpture becomes poor and molding becomes difficult, and the adhesiveness to the core material is reduced. More preferably, it is 1 to 6 in terms of the formability, adhesion to the core material, and the like.
The range is 0 parts by weight.

Examples of the inorganic powder include talc, wax, kaolin, sericite, feldspar powder, silica stone powder, other clay minerals, calcium carbonate, shirasu balloon, silica hollow balloon, fly ash balloon, and the like. One or more of these can be used. The amount of the inorganic powder is preferably 100 to 700 parts by weight with respect to the water-soluble synthetic polymer resin, the sizing agent, and the pulp. If it exceeds 700 parts by weight, it becomes hard and it becomes difficult to form. More preferably, from the viewpoint of adhesion to hands and formability, 20
It is in the range of 0 to 500 parts by weight.

Further, among inorganic powders, a powder having a specific gravity of 1 or less, such as a shirasu balloon having a specific gravity of 0.3 or a silica-based hollow balloon having a specific gravity of 0.25, is used.
The specific gravity of the clay as a whole can be made 1 or less, and the clay can be floated in water. By doing so, it is possible to float a work formed by school children and the like on the water and play it, and to make the clay interesting for school children and the like. Also, in this case,
The powder is not limited to one composed of only inorganic powder, but may include powder other than inorganic powder so that the specific gravity of the clay as a whole is 1 or less. Other lightweight powders with a specific gravity of 1 or less, such as a porous plastic pigment of 0.4 or a plastic balloon with a specific gravity of 0.02, are included in the inorganic powder, and the specific gravity of the clay as a whole is 1 or less and floats on water. You may do it.

As the paste, carboxymethylcellulose (CMC), poval (PVA), starch, methylcellulose, ethylcellulose, hydroxyethylcellulose and the like can be used. The amount of the paste is preferably in the range of 1 to 70 parts by weight based on the amount of the inorganic powder, the water-soluble synthetic polymer resin, and the pulp. If the amount is more than 70 parts by weight, the shrinkage after molding will be large. It is more preferably in the range of 10 to 60 parts by weight from the viewpoint of sculpting and shrinkage after molding.

Examples of the pulp include natural pulp such as softwood and hardwood, and synthetic pulp. The blending amount of the pulp is preferably in the range of 5 to 100 parts by weight based on the inorganic powder, the water-soluble synthetic polymer resin, and the paste.
If the amount is less than 100 parts by weight, shrinkage and cracks after molding will increase, and if it exceeds 100 parts by weight, sculpture will be lacking and molding will be difficult. More preferably, it is in the range of 20 to 60 parts by weight from the viewpoint of shrinkage, cracking and sculpting after molding.

The mixing amount of water is 10 to the whole of the above-mentioned inorganic powder, water-soluble synthetic polymer resin, sizing agent and pulp.
A range of 0 to 400 parts by weight is preferable. If it is 100 parts by weight or less, it is hard, lacks sculpture and it is difficult to form, while if it exceeds 400 parts by weight, it becomes soft and sticks to the hand. More preferably, 200 in terms of sculpting and hand adhesion.
It is in the range of 400 parts by weight.

The preservative can be used as long as it is safe, and is not particularly limited.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The clay of the present invention will be specifically described below with reference to numerical values.

Embodiment 1

Average particle size 200 mesh or less, whiteness 80
300 parts by weight of the above talc, specific gravity 0.3, particle size 40
A total of 400 parts by weight of inorganic powder was prepared from 100 parts by weight of a shirasu balloon of μ, and 40 parts by weight of carboxymethylcellulose (CMC) having a degree of polymerization of 500 as a sizing agent and a viscosity of 40 cps were added to the inorganic powder. After mixing 50 parts by weight in a mixer and stirring and mixing, 300 parts by weight of water, 40 parts by weight of polyamide epichlorohydrin as a water-soluble synthetic polymer resin, and a small amount of a preservative are added and mixed by stirring. As a result, a water-resistant clay of the present invention was obtained. or,
The polyamide epichlorohydrin used has a viscosity of 30 to
75CP / 30 °, PH6-8, specific gravity 1.093 / 20
° C.

A comparative test was conducted on the water resistance of the obtained clay containing the water-soluble synthetic polymer resin of the present invention and a conventional clay (conventional product) not containing the water-soluble synthetic polymer resin. Table 1 below shows the test results. In this comparative test, three clays of the present invention (samples NO1 to 3) and three conventional products (samples NO4 to 6) were formed into a predetermined shape, each was left outdoors for 30 days, and Was performed by examining the surface condition and shape change of each of the samples. During the test period, the rainy day was 10 days.

[0020]

[Table 1]

As shown in Table 1, the entire surface of the conventional product after standing was melted and felt slimy, and the formed shape was completely collapsed. No change was seen. Although not shown in Table 1, at the same time as the above test, a separately manufactured conventional product was allowed to stand for 30 days only on days when it did not rain, and the situation after the standing was examined. As a result, almost no change was observed in the surface and the shape.

Embodiment 2

A polymerization degree of 500 and a viscosity of 40 cp were added to 100 parts by weight of a silica-based hollow balloon having a specific gravity of 0.3 and a particle diameter of 40 μm.
After mixing 20 parts by weight of carboxymethylcellulose (CMC) and 80 parts by weight of natural pulp in a mixer and stirring and mixing, 400 parts by weight of water, 20 parts by weight of polyamide epichlorohydrin, and a small amount of a preservative are added. By adding and stirring and mixing, a water-resistant clay of the present invention was obtained.
The polyamide epichlorohydrin used had a viscosity of 3
0-75CP / 30 °, PH6-8, specific gravity 1.093 /
20 ° C. was used.

After the obtained clay was shaped into a work of a predetermined shape, it was floated when put in water. Also, 5
The condition was left for 5 days, and the condition after 5 days was examined. As a result, no change was observed in the surface and the shape.

[0025]

As described above, the clay of the present invention has good water resistance, and can maintain its state after molding even when it is decorated outdoors and exposed to rain, or when a formed work is used as a fountain. It was possible to not only decorate it indoors, but also decorate it outdoors and use the shaped work as a fountain. or. By making the specific gravity of the whole clay less than 1 that can be floated on water as a lightweight material, it is possible to play with the work modeled by schoolchildren floating on the water, and a new clay that is interesting for schoolchildren etc. I was able to.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-39420 (JP, A) JP-B-57-16356 (JP, B2) JP-B-2-32636 (JP, B2) JP-B Sho-59- 50615 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G09B 19/10 C01B 33/40 C04B 33/04

Claims (3)

(57) [Claims] 1. A water-resistant clay comprising an inorganic powder as a main component and a polyamide epichlorohydrin and / or a polyamide epoxy. 2. A mixture of 100 to 700 parts by weight of an inorganic powder, 1 to 70 parts by weight of a sizing agent, 5 to 100 parts by weight of pulp, and 1 to 70 parts by weight of a polyamide epichlorohydrin and / or a polyamide epoxy. Water-resistant clay characterized by being made. 3. The water-resistant clay according to claim 1, wherein the specific gravity of the whole clay is set to 1 or less, so that the clay can be floated on water.