DE1469840B2 - MODELING CLAY - Google Patents

Description

The invention is directed to the use of a mass, which is a synthetic or as the main binder semi-synthetic organic macromolecular compound, which is soluble in water to form colloids, as well as an aggregate and water contains, as a modeling compound, which hardens by drying and optionally can be plasticized again by adding water.

All these compounds are soluble in water, so that the plastic state of the mass in each case is desired Way is changeable. Even the dried, solid mass can be removed in this way, i. H. by addition of water, make it plastic again.

Such a mass offers the possibility of producing very thin, in some cases even more elastic Layers. In addition, especially because of the uniform packing of the aggregates, their Appropriate choice can be achieved that no changes in shape or size occur during drying. Finally, the mass is less prone to decomposition than similar masses that use a natural binder and finally, if desired, by means of certain additives or a special treatment, z. B. a heat treatment / a final curing can be achieved.

Fine-grained, powdery or flaky products such as minerals, sands, ores, metals, wood, glass, organic plastics and inorganic types and mixtures thereof, optionally with the addition of dyes.

The respective degree of plasticity of the mass can also with the help of different concentration, but also can be influenced by appropriate choice of the chain length of the specified binder molecules. at use can also be made of the thixotropic effect of the composition according to the invention.

It has already been known to use cellulose derivatives for the production of plastic masses. They often only serve as improving aids and in addition to mixtures that too set without additives. Occasionally they are also used as temporary binders in materials before the Related to firing These binders have also been used to date for the production of adhesives. These but have no points of contact with the here in terms of structure, mode of action or appearance treated plastic masses.

A plastic mass is also part of the state of the art, which in addition to a little cellulose ether, kaolin and cement contains a substantial proportion of starch in the form of flour as a binder, while as Filler is a special wood fiber material that forms a matting when the mass dries, making it stable Structure there. Such a method is used for modeling purposes or similar areas of application but not considered.

Also the known use of polyvinyl alcohol, e.g. B. inks, inks, paints, paints, Ointments or the like. There is no reference to plastic masses for shaping and modeling or the like, because in the prior art case of polyvinyl alcohol has a protective colloid function namely, to prevent the particles from settling in the carrier liquids. . The polyvinyl alcohol is in no way used as a binding agent.

As is also known, methyl cellulose is used, for example, for the preparation of paints or plaster of paris bandages If used, the methyl cellulose only causes temporary conditioning, whereas hardening the mass does not take place through the methyl cellulose, but through the setting plaster of paris. Methyl cellulose as an additive to paints, in turn, has the meaning of a protective colloid in an aqueous dispersion to avoid settling of the color pigments. From all of these previously known forms of application, one can No reference to the plastic mass, which is used in particular for shaping and modeling purposes remove.

From DT-PS 8 68 572 is already the use of an essentially soluble in water Cellulose derivative and inorganic fillers existing mass as plaster mortar and filler known. However, the cellulose content is at most 2%, based on the dry matter content the mass, which should preferably also contain hydraulic binders, to a sufficient Maintain water resistance. Such a mass can be seen as a modeling mass, which after the Hardening by adding water should be able to be plasticized again, neither intended nor suitable.

In the German utility model 16 88 746 relating to a play concrete construction kit Finally, a toy concrete compound in powder form has already been described, which is the sole binding agent of starch contains. The building blocks are obtained by cutting out the paste made with water. As a modeling clay However, such a mass is also unsuitable because it is too sticky on the one hand and conversely, it has too little toughness before hardening to make the design more complicated allow sufficient self-supporting structures before curing.

The following are individual examples of compositions of the plastic masses:

example 1

Quartz modeling clay
75% quartz sand

5% soluble cellulose compound
20% water

possibly preserving additives

Example 2

Combined wooden putty for making dough
23% wood flour No. 60-80

23% calcite ground 16 900 Masch.
5% soluble cellulose compound
(Add 49% water)

Example 3

Plastic glass mass 70% finest glass beads 3% polyvinyl alcohol 27% water
possibly hardening and / or preserving additives

Example 4

Plastic metal mass for pasting 70% aluminum grit, 2% soluble cellulose compound

1% polyvinyl alcohol (add 27% water)

Example 5

Plastic modeling clay
50% black polystyrene, 5% polyvinyl alcohol, 20% glycerine
25% water
possibly preserving additives

Example 6

Plastic colored modeling clay 75% colored minerals 5% soluble cellulose compound (add 20% water)

Claims (1)

Claim: Use of a mass that has a synthetic or semi-synthetic, organic as the main binder macromolecular compound, which is soluble in water with colloid formation, and an additive and contains water, as a modeling compound, which hardens by drying and optionally can be plasticized again by adding water.