DE3003918A1 - Water-based paints contg. casein and shellac binders - with improved storage properties and resistance to putrefaction - Google Patents

Abstract

Casein paints contg. casein, water, lacca (shellac), sodium tetraborate, zinc oxide white, titanium dioxide and boiled linseed oil or half-oil. A shellac soln. is first made by hydrolysis of the shellac in hot water with the sodium tetraborate, cooling, mixing with other ingredients and then with a casein size, made by mixing casein with hot sodium tetraborate soln. A white base paint which can be coloured by addn. of usual pigments is obtd., with very good covering powder and resistant to washing after drying and oxidn. The binder is made from natural prods., free from synthetic resins or plasticisers, and hence physiologically acceptable.

Description

DlPL -IMG. GSKHARD F, HIEBSCH

PATENT ADVOCATE

PROFESSIONAL REPRESENTATIVE BEFORE THE EUROPEAN PATENT OFFICE MANDATAIRE AGREE PRES L'OFFICE EUROPEEN DES BREVETS

D-7700 SINGEN ,, _T , Erzbergerstr. 5a

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"of" sphgnburh Lake Constance patent

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Casein color and process for its manufacture

Casein colors from the cheese substance of the milk, digested with alkalis, used to be used in the so-called secco technique, i.e. on dry plaster, common; It is well known that casein dyes bind water-insoluble after drying.

However, these colors have not found their way into the newer painting technique because of their difficult handling; above all problems have arisen with the storage and distribution of ready-to-use casein paints.

Thus, the inventor has set himself the goal of developing a casein color which can be manufactured and sold ready for use and does not turn into putrefaction if the viscosity remains the same

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030034/061 7

Casein dyes, which are found according to the invention, lead to the solution of this problem from several binder components, pigment components and solvents or stabilizers or preservatives put together. Casein, shellac and modified binders have proven to be particularly beneficial To use half oil, but to make up the pigment components from zinc oxide white, titanium dioxide, cellulose flour and a clay mineral similar to kaolinite; as solvents are according to the invention Sodium tetraborate, oleic acid, oleum thymii and - preferably softened - water are used.

A particularly favorable composition of the natural binder paint according to the invention consists of about 3.9 percent by weight casein; 2.9 % Lacca alba; 5.8 % boiled linseed oil; 6.04 % zinc oxide white; 18.12 % titanium dioxide; 3.87 % cellulose flour; 0.77 % montmorillonite; 0.58 % sodium tetraborate; 1.21 % oleic acid; 0.05 % oleum thymii and 56.79 percent by weight of water, which is primarily added at a temperature of 75 C.

The method according to the invention is characterized in that first a shellac solution is prepared by saponifying sodium tetraborate, borax or tinkal on the one hand and bleached shellac (Lacca alba) on the other hand in water heated to about 75 ° C. and this solution is added to a mixture of water and montmorillonite after it has cooled about 90 minutes stirring time as well as water and zinc oxide at a stirring time of about 40 minutes with the addition of cellulose flour and titanium dioxide for about 60 minutes. This process is advantageously carried out in a stirred vessel into which first about 8 % montmorillonite and water, then the zinc oxide with water and then the described Lacca alba solution with cellulose flour and titanium dioxide are introduced.

030034/0617 _

With regard to further procedural steps, please refer to the content of Claims 6 to 10 are referred to.

A natural binder paint is created as a white primer for glazing techniques, with natural casein emulsion as the binder Finds use, which is part of the method according to the invention. Titanium dioxide is preferred as the pigment base and zinc oxide are used.

The binder paint according to the invention is radiantly light and its hue can be changed with sumped artist pigment paints .

The ready-to-use paint has very good coverage and is smudge-proof after drying, and even washable after complete oxidation. A particular advantage with regard to environmental friendliness must be seen in the fact that the paint is produced without synthetic resins and synthetic plasticizers and is thus to be regarded as physiologically sound.

In addition, the binder paint according to the invention can be used with any conventional Material to be painted over.

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030 0 34/0617

30G3918

The method according to the invention is illustrated below using an exemplary embodiment, the only FIGURE the drawing illustrates the five process stages for producing the subject matter of the invention in a sketchy manner.

The casein emulsion paint produced in the chosen embodiment is ready for use and has the viscosity today common emulsion paints. It is made from pure natural products and without synthetic preservatives. The following proportions were used here!

1. Binder

2. Pigments

3. Solvent

Stabilizers Preservation

0.8 kg 0.6 kg 1.2 kg 1.25 kg 3.75 kg 0.8 kg 0.16 kg 0.12 kg

0.25 kg

0.01 kg

11.75 kg

Lactic acid casein (powder) Lacca alba (powder) Linseed oil varnish (half oil, modif.) Zinc oxide white Titanium dioxide, rutile Cellulose flour Magnesium montmorillonite

(OH) ₄ ] 8

respectively.

Na ₀ B, O ₇ · 10 H _o 0 Z. 4 / Δ

Oleic Acid Oleum Thymii H ₂ O (softened)

To produce the color, in a first process stage I, a 20 jSige casein solution from casein powder and then introduced sodium tetraborate, borax or tinkal is first produced in a stirring vessel 1 with agitator 2 in water at about 75 ° C (station A in the drawing) and on the other hand, in a further vessel 1 _q, the sodium tetraborate is saponified with a powder of bleached shellac to form a 12% lacca alba solution (station B). 030036/0617

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30Π3818

Both solutions are allowed to cool down sufficiently long in stage II

Preferably, on the following day, water with 8% of a kaolinite-like is first placed in a further vessel 1 (stage III)

clay mineral mixed for 90 minutes, then water with zinc oxide white added for 40 minutes, (Sub-levels α and b).

Then, on the one hand, the already described Lacca-alba solution Y is added, on the other hand, some cellulose flour and titanium dioxide - the latter components are added in sub-stage c mixed in for an hour.

Then the mixture in stage IV rests for half a time Day.

For example, on the third day, in stage V , oleum thymii and oleic acid with 75 C hot water are added to the casein glue of 20% produced in stage I and this mixture, together with a modified linseed oil varnish, is added to the substance from stage II over a period of 30 minutes.

The result is a natural binder color in which in a balanced The extent to which the binding agents interact, which react both with one another and with other components of the recipe O

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030034/061 7

BATH ORIGINAL

3Ov3918

The digested casein (casein glue) and the liquid resin solution of the shellac result in a highly viscous reaction viscous Galerte, which makes it possible according to the invention, a to produce ready-to-use casein paint, which does not turn into putrefaction while maintaining the same viscosity; as further The oleic acid and thyme oil added in stage V have a stabilizing effect.

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030034/0617

summary

Casein colors from the cheese substance in milk, digested with alkalis, used to be common in the so-called Secco technique; It is well known that casein dyes bind water-insoluble after drying away. However, these colors have not found their way into the newer painting technique because of their difficult handling; above all, it had been shown that it is difficult to store and sell ready-to-use casein paints.

To solve the problem of developing a casein color which can be manufactured and sold ready for use and if the viscosity does not go into putrefaction, casein dyes, which are made up of several binder components, Pigments as well as solvents or stabilizers or preservatives put together·

A preferred composition of this natural binder paint consists of about 3.9 percent by weight casein; 2.9 % Lacca alba; 5.8 % linseed oil varnish, 6.04 % zinc oxide white; 18.12 % titanium dioxide; 3.87 % cellulose flour; 0.77 % montmorillonite; 0.58 % sodium tetraborate; 1% oleic acid; 0.05 % oleum thymii and 56.79 percent by weight of water, which is primarily added at a temperature of 75 C.

030034/0617

Claims (9)

A.Z. Sheet -Al- PATENT CLAIMS 1. Casein color from cheese substances in milk, characterized by the following components: casein, H "0, lacca, sodium tetraborate, Zinc oxide white, titanium dioxide, half oil or linseed oil varnish. 2. Paint according to claim 1, characterized by oleic acid and / or Oleum thymii. 3. Paint according to claim 1 or 2, characterized by cellulose flour and / or a kaolinite-like clay mineral. 4. Color according to claims 1 to 3, characterized by the following components in approximate percentages by weight! 5 % lactic acid casein, preferably 3.8 to 4 % 4 % lacca (alba), preferably 2.8 to 3 % 7.5 % linseed oil varnish (half oil, modified) preferably 5.7 to 6 % 7% ZnO, preferably 6.0 to 6.5 % up to 20 % TiO ₂ , rutile, preferably 17.5 to 19 % 4 % cellulose flour, preferably 3.9 % 0.8 % magnesium montmorillonite, preferably 0.77 % 0.6 % borax, preferably 0.58 % 2% oleic acid, preferably 1.21 % 0.08 % oleum thymii, preferably 0.05 % % Water (softened), preferably 56.8 %. -A 2-030034 / 061 7 3 , 75 until 2 , 5 until 5 until 5 _r 03 until 15th until until until until until approximately until ο, ο, 1 ο, 50 30Π3918 5. A method for the production of a casein color from cheese substances of milk, characterized in that first a shellac solution by saponifying Na ₂ CB ₄ O ₅ (OH) ₄ II 8 H ₃ O or Na "B. O ₇ " 10 H "0 and Lacca (alba) prepared in hot water and these after cooling a mixture of water and montmorillonite (stirring time about 90 minutes) and water and zinc oxide (stirring time about 40 minutes) with the addition of Cellulose flour and titanium dioxide is mixed in for about 60 minutes. 6. The method according to claim 5, characterized in that the resulting mixture rests for several hours 7. The method according to claim 5 and 6, characterized in that the mixture casein glue (about 20 % strength) is added (stirring time about 30 minutes). 8. The method according to claim 5 and 6 or 7, characterized in that that the mixture modified half oil is optionally mixed with casein glue. 9. The method according to claim 7, characterized in that casein powder with sodium tetraborate small amount in hot water (about 75 C) mixed and this mixture after cooling and adding more hot water about 1 weight /? the Mixture of oleic acid and about 0.05% by weight of the mixture be stirred in oleum thymii, after which this solution (X) is added to the mixture according to claim 5. -A 3- 030034/061 7 3 CJ Π 3 Π 1 8 10. The method according to at least one of claims 5 to 9, characterized by what is specified in claims 1 to 4 Mixing ratios. 030034 / OG17