DE3130547C2 - - Google Patents

Description

The invention relates to a kneadable, air-curable or heat-curable Modeling or molding compound, according to the preamble of Claim 1.

A comparable modeling clay is, for example, from DE-PS 116 769 and known from FR-AS 20 00 422. However, these are always permanently plastic Modeling compounds based on paraffin, resin, wax, Tallow, petroleum jelly and paint (DE-PS) or generally wax, Plasticizer and filler (FR-AS).

This is disadvantageous for many areas of use especially the fact that these masses do not become solid, or should not be intended to be fixed. This is it not possible the created models or any To preserve works permanently or even functionally to use. You can also use these modeling materials manufactured product not - for example cutting - further processing, painting or labeling.

In DE-AS 29 37 843 air or thermosetting modeling or molding compounds described, which in addition to polyvinyl chloride or ceresin wax as a binder Aluminum hydroxide as filler; Plasticizers and / or solvents and possibly dyes and others Additives included.

If curable materials are mentioned, dry them these, if necessary, very quickly and often create tension, whereby u. U. cracks and / or unwanted deformations can result.

Furthermore, curing modeling materials are known which usually consists of water, polyvinyl alcohol as a binder, Kaolin, chalk and / or wood flour as fillers, and possibly from preservatives, drying retardants (e.g. glycerin), pigments or dyes, and any other additives. The particular disadvantages of these known masses exist in that these masses are strong when processed Soiling, for example of the hands and others Processing agents, cause and fade on drying, that they also under severe shrinkage and Harden cracking and that they may already be in the  Process - and therefore too quickly - dry out so that often during the modeling cementing of yourself forming cracks must be made or Reworking with water is required. In addition, the models created with this have a dull surface, which is usually additional must be painted if the model is appealing should look like.

The object of the invention is therefore an air or to create thermosetting modeling or molding compound, which does not have the disadvantages mentioned and thus is easy and clean to process, without additional Aids in the air at room temperature or at elevated temperature without severe shrinkage or Deformation cures without excessive cracking and the permanent, editable and possibly functional usable and color-intensive objects with smoother and pleasing surface results.

This task is done with a modeling or molding compound of the type mentioned by the features of claim 1 solved in a surprising and simple way.

By adding benzyl alcohol and / or benzaldehyde to dissolved in water or in organic solvents or dispersed binders that harden the Can cause mass, depending on the chosen binder and with appropriate wax components, an air drying Solidify the created objects at room temperature or also at elevated temperature, which is preferably between 40 and 140 ° C is caused.

The hardening time can be determined by the special Selection of components and / or by adding Accelerators or decelerators within certain limits pretend.  

As particularly suitable for the composition according to the invention, dissolved in water or in organic solvents or dispersed binder, can be cellulose ether, dextrin, Polyvinyl alcohol, polyacrylate, acrylate copolymer, Polyvinyl acetate or another plastic with the mentioned properties and sufficient tolerance with the remaining components, or a mixture of the mentioned substances can be used.

In addition to being dissolved, the binder can also be dispersed Form so that it is usually considered colloidal Solution or mixed as a dispersion in the base becomes.

Equally well suited also in organic ones Acrylic ester copolymers dissolved in solvents or natural resins in combination with those Waxing and other components.

These fabrics, together with adjusted accordingly Waxing or waxy substances, masses that adhere to in the air or at room temperature.

For modeling or molding compounds that are used at elevated temperatures - Preferably between 40 and 140 ° C. Temperatures - should harden, for example a vinyl chloride / vinyl acetate copolymer dispersion, whose minimum film temperature is 60 ° C, especially. As a suitable wax for this, e.g. B. a polyethylene wax with a molecular weight of MG 3000 and one Freezing point of 120 ° C can be selected.

Suitable waxes for the composition of the invention still special: paraffin wax, beeswax, Ceresin wax and / or polyethylene wax, each individually or in a mixture with each other, within the scope of tolerance mutually and with the other components of the mixture.  

Wax additions in a lot have been advantageous between 1 and 30 percent by weight of the total mass, preferably between 2 and 20 percent by weight.

The effect of the wax addition is enhanced by the use of Starch or finely divided silica as not opaque filler, still improved.

As known, kaolin can be used as other components or chalk as another or further filler, if e.g. B. for technical purposes, the color effect is irrelevant is, as well as pigments as colorants, preservatives and Z. B. glycerin as a drying retardant, and / or various other additives can be added.

Of course, depending on the requirements of the end product individual components are omitted or by like or within the mixture in the same way effective substances replaced as well as within the mutual Compatibility also within the examples or other mixtures can be exchanged. Unless after how in front of a drying modeling or molding compound based on wax is obtained, which causes the curing Contains binder solutions or dispersions thereby not departing from the scope of the invention.

In addition to the production or shaping of any figures, Decorations or other motifs in the context of creative or artistic design, with or without shaping or decorative finishing, the inventive mass also very advantageous for the Manufacture of any technical or other functional items such as B. Molds for Plastic, plaster or wax castings or similar, for stands, Holders, brackets, boxes, frames for storing e.g. B. writing instruments, tools or other diverse  Office, home or workshop utensils etc. Above all due to the low shrinkage, such and any other objects directed as desired "cast in" or fully or partially "molded" be, so that after the curing, if necessary, precisely adapted Receive "mold nests" in which the subject in question can always be used as directed can, unless it should remain permanently embedded.

When using different plastic dispersions as a suitable binder in the context of the invention after drying, the mass is also largely waterproof. This effect is caused by the addition of benzyl alcohol and / or benzaldehyde even more intensely or with cellulose ether achieved as a binder.

This addition in particular may also act as a Drying retardant, so that an extremely slow and stress-free drying takes place, which additionally the Counteracts the formation of cracks and unwanted deformations.  

The invention is based on a few exemplary embodiments explained again below.

The quantities are understood here - analogous to the Information in the claims - in percentages by weight.

Example 1 represents a framework example, its limit values can be considered for special requirements.

Examples

Claims (9)

1. Kneadable, air-curable or thermosetting modeling or molding composition, containing

• a) at least one wax or a wax-like substance,
• b) at least one filler,
• c) at least one binder solution and / or a binder dispersion based on water or organic solvent,

characterized in that they additionally

• d) contains benzyl alcohol and / or benzaldehyde.

2. modeling or molding composition according to claim 1, characterized, that they are an aqueous solution as a binder solution of cellulose ether, dextrin, polyvinyl alcohol and / or as a binder dispersion, an aqueous dispersion of Polyacrylic, acrylic copolymer, polyvinyl acetate or suitable mixtures thereof, which makes the Mass cures at room temperature. 3. modeling or molding composition according to claim 1, characterized, that they are used as a binder solution in organic Acrylic acid ester copolymer dissolved in solvent or contains natural resin that helps cure Room temperature.   4. modeling or molding composition according to claim 1, characterized, that it contains a vinyl chloride / Contains vinyl acetate copolymer dispersion causes hardening at elevated temperature. 5. Modeling or molding compound according to one of the preceding Expectations, characterized, that the contained wax or the wax-like substance has a freezing point between 40 and 140 ° C. 6. Modeling or molding compound according to one of the previous claims, characterized, that they as a wax or as a waxy substance Bee, ceresin, paraffin and / or a Contains polyethylene wax. 7. Modeling or molding compound according to one of the previous claims, characterized, that they have 2 to 20 wt .-% wax or waxy substance or contains wax mixtures. 8. Modeling or molding compound according to one of the previous claims, characterized, that they are starch or finely divided silica Contains filler.