DE19601585C2 - Silicate chalks - Google Patents

Abstract

The invention relates to mineral silicate crayons in a dry, compact form composed of inorganic color pigments and inorganic additives which are bound by potassium water glass in connection with amorphous silica, and a process for their production.

Description

The invention relates to a mineral silicate chalk in dry compact shape.

Silicate chalk differs from the previously known Pastel, school and Painting crayons by using only anorga color pigments and binders.

In contrast, the pastel, School and Painting crayons also made from organic pigments lacquered soluble dyes and only organic binding average.

Organic binders are: Various plastics (e.g. Polyvinyls / dispersions) and cellulo found in nature sen, resins, rubber.

A solidifying final fixation of the previously known Pastel, school and Painting crayons is only possible with fixatives, which consist of the above binders and in water, alcohols or paints are loosened.  

Characterized by these organic material components, whether pen or compact form (the latter e.g. school chalk u. round pastel pencils) do not make these chalks a painting material with the artist, craftsman u. Restorers, one weatherproof, pastel-like paint application on plaster, concrete and. Can apply stone.

Organic chalk and its organic fixative inorganic substrates such as plaster, concrete and. stone do not represent a generic unit.

Silicate chalks are said to exist in the painting technique Closing the gap, so that with inorganic crayons, the inorganic binding u. Fixative and inorganic A generic unit is given, whereby at the same time an optimal durability of the paint application is achieved.

The most solid and durable painting technique on inorganic so far underground (plaster, concrete, stone) is terracotta the silicate or mineral paint technology.

(Also notes in the standard work of painting technique "Materials and Techniques of Painting" by Prof. Kurt Wehlte; Page 264 / Otto-Meier-Verlag Ravensburg).

The silicate or mineral paint technology, with powdery pigments and potassium water glass as a binder, i.e. with liquid Colors, exist since 1879. (DE-PS 4315). In the Publication "Paperback for the paints and varnish industry "13th edition, 1954, pages 1 to 7 and 888 to 890 can be found on page 4, under 4. b) the designation "New burger pebble chalk ". This is not a factually correct one Term for finely ground kaolin from Neuburg. The on pages 888 to 890 of the publication  The use of potassium water glass as a binder refers to Silicate paints, d. H. on wet paint.

The object of the invention is to dry silicate chalks to create a compact shape. This problem is solved by the subject of claim 1. Production and use as well as further advantageous configurations result from claims 2 to 6.

The invention thus makes a painting material, in particular in the form of square bars, with pastel material delivery on slightly to more rough inorganic substrates (Plaster, concrete, stone).

With the silicate chalks, pastel-like color can be applied by means of abrasion and pasted by means of a silicate fixative (potassium water glass), both artistically and by hand, on slightly to more rough, inorganic substrates. The color palette results from mixtures of different inorganic color pigments; Pastel shades are planned in a range of up to approx. 50 shades. The components of silicate chalk and their production:

• - All inorganic-mineral color pigments,
• - Inorganic aggregates in different Parts by weight of the respective pigment (alumina hydrate, bitter earth, silica, amorphous silica). Commercially available for the silicate chalk Dry pigments of mineral colors, painting, and. Painting technology that uses the aggregate of alumina already contain hydrate, bitter earth, silica (see above DE-PS 4315). These dry pigments is 2% amorphous silica for this invention added.  
• - Potassium water glass (potassium silicate) as a binder.

The dry mixture of pigment u. Additives, so much of the potassium water glass is added give until homogeneous, creamy with automatic stirring Porridge is created.

Depending on the pigment, the proportion of potash water glass can be between 9-11% of the pigment-aggregate mixture. The automatic mixing process at level 2 (middle Speed) approx. 4 minutes.

The creamy porridge is given in plastic molds Shaking (vibration) compacted in the mold and immediately afterwards molded. The still wet bars can be used immediately or after about eight days of drying / hardening, in thin Tissue paper can be wrapped.

This drying or curing process is for the gelin compact color bars, regardless of the format, of the same importance as the material components and the mixing process. Slow drying over approx. 8 days, at a room temperature of 16 ° to 18 ° Celsius and air humidity of 65 to 75% must be observed.

Very different values can lead to a. to cracking or glazed surface or both. After the successful one Drying / hardening, can be done immediately with the silicate chalk the slightly to more rough inorganic described Pastel-like substrates (plaster, concrete, Stone). As long as the silicate chalk so applied are not yet fixed, is still a decrease in Color application possible; e.g. B. dry by rubbing or using water (brush sponge, brush), d. H. corrections are possible at this stage. The final fixation  done with potassium water glass (potassium silicate) by spray fixation. The potassium water glass can, depending on the thickness of the Paint application, pure or in any dilution with water be sprayed on. With this final fixation, the inorganic pigments silicifying on the inorganic Bound underground. Surface, paint application and fixation, then form a generic unit based on anorga niche-mineral-silicate.

Areas of application for the silicate chalk:

• 1. For paintings on plaster, concrete, stone, terracotta Architecture and figuration, with typical requirements Characteristic of a pastel color application and absolute Weatherproof.
• 2. For restorative measures, in the manner of retouching defects in historical plaster or stone surfaces; the latter z. B. for tinting new sandstone crossings (Pieces) in an aged environment.
• 3. For markings, logos on facades with sub set up as under 1.

With this new painting technique, completely new and diverse design and application options. It is also possible to apply silicate chalks to a professional subject schools, art schools and academies in the teaching programs bring.

Claims (6)

1. Mineral silicate chalk in a dry compact Form from a) inorganic color pigments, b) alumina hydrate, Bitter earth, silica and amorphous silica as anorga African aggregates and c) potassium water glass as a bandage medium. 2. A process for the preparation of the mineral silicate chalk according to claim 1, characterized in that

• as much potassium water glass is added to the dry mixture of inorganic color pigment and inorganic additives in a stirrer until a homogeneous, creamy pulp is formed with stirring,
• - this creamy pulp is placed in a plastic mold, compacted by shaking in the mold and molded immediately afterwards,
• - And the wet bars are subjected to a drying / curing process at a temperature of 16 to 18 ° C and a humidity of 65 to 75% over a period of 8 days.

3. Use of the mineral silicate chalk after Claim 1 as a dry painting material on light to stronger rough inorganic substrates in connection with potassium water glass as a fixative. 4. Use of the mineral silicate chalk after Claim 3 for paintings on plaster, concrete, stone and terra kotta of architecture and figuration. 5. Use of the mineral silicate chalk after Claim 3 for labels and logos on facades Surfaces made of plaster, concrete, stone and terracotta.   6. Use of the mineral silicate chalk after Claim 3 for restoration measures in historical Plaster or stone surfaces.