DE619498C - Process for the production of cheap, submerged, colored silicate paints on concrete - Google Patents

Description

Process for the production of cheap, underwater durable, colored Silicate paints on concrete The invention described below relates to a process for the production of cheap, underwater durable, beautifully colored, blue-green silicate paints on concrete, e.g. B. in water tanks.

Are such water tanks as swimming pools from bathing establishments, Water tanks, fountains in parks and gardens and the like, according to modern Construction in cement concrete with smooth line, then its inner surface is accordingly the natural color of the binder (cement) used, usually gray with a yellowish or greenish tinge, and the water filled in them appears dark, dull and unsightly.

This disadvantage can be remedied by adding a light color to the inner surface Color and possibly a good light reflectivity granted, z. B. by lining .the container with glazed stoneware tiles, as is often the case with bathing and swimming pools happens, or: by applying a suitable interior coat of oil paint or the like. Like. Both methods are expensive, and the interior painting usually still has the disadvantage low durability.

So here, as in many other cases, you have cement moldings wanted to use the cement as a cheap substitute for stone carving to color, either by the cold gray of its natural color with a warmer tone to replace or to achieve colors that came close to those of natural rocks. Experiments of this kind are very old and have been well known for a long time. This is how Dr. G. Feichtinger in his book "The chemical technology of mortar materials", 1885, such attempts, citing information from R u d. Dyckerhoff in the "Tonindustrie-Zeitung" 1882, which added earth colors to the coloring of cement goods Recommended for cement, such as brown stone, caput mortuum, ultramarine, ocher.

It was also known that finished cement products were made by soaking can seal and harden with water glass solution, and this method is not available Applied only to uncolored cement objects, but also to those that by the addition of oxide or earth colors, as indicated above, were colored and the had noticeably lost strength as a result of these additives (cf. Feichtinger a. a.0. Page3q.6 below and Page 349 Paragraph 3, furthermore in the book by S. Lehner »Die Imitations «, Hart-Lebens Verlag, 3-. Edition 29o9 page 2-30123r »Silicified cement masses«).

But there are already artificial coloring of cement products through Soaking the same with heavy metal salt solutions has been produced, whereby, through the quicklime released during the setting of the cement from the metal salts oxides or hydr Oxides of the metals in question precipitated, either were colored themselves or were oxidized in the air and new colored oxides or. Hydroxides of a different color formed: With this impregnation, the cement objects not only colored, but also hardened.

This latter fact was probably the reason that one the cement objects stained with heavy metal salt solutions on every post-treatment waived with water glass. In any case, there is no such thing in the literature mentioned.

The above information indicates the state of the art these areas prior to the time of the present invention.

In the preparation of this procedure is used by the well-known Fact assumed that pure water in a layer thickness of about 2o m absorbs all light rays except blue. The water then appears blue, pointed z. B. in the so-called Blautopf in Blaubeuren. If the layer is thin, it will also Green is no longer fully absorbed, leaving the water in shallower places appears bluish green or green. At the usual water depths in swimming pools In indoor and outdoor pools, pure bathing water therefore appears light green, provided that the walls. and, the bottom of the basin those types of light that let the water pass through reflect largely and not absorb.

Therefore, in water tanks .bzw. Basin apparently the intended one Color impression is best achieved when the walls and floor of the basin are straight those blue and green rays of light reflecting off the water at the given water depth passed through without too great a weakening by absorption will.

So the task was to find a cheap, submerged, light blue-green wall and floor coverings; Painting or plastering for: the water tanks to find those made of concrete or masonry and smoothed out are. This task seemed the best one of the appropriate consistency and composition manufactured mixture of white cement, water and copper chloride to match, as needed, e.g. B. for grouting or plastering, also additions of white sand or the like can be mixed.

In the production of such mixtures, as is known, by the during the setting of the cement from this released quicklime in chemical interaction Chlorcalcium easily soluble with the copper chloride and a greenish-blue one Precipitation of copper hydroxide formed, which gave the cement mixture the desired Color is granted and is almost entirely insoluble in pure water. Meanwhile it is bathing water not to be avoided at all: avoiding .the same thing when using .organics and ammonia compounds is somewhat contaminated. It is therefore to be expected .that such substances will form complex compounds with the copper hydroxide which, even if they arise only to a limited extent, but are capable of indissolubility noticeably reduce the copper precipitation.

It would therefore be a paint or plaster composition that is essentially. consists of a cement that is brightly greenish blue colored by copper hydroxide, in spite of their beautiful and matching coloring, the requirements to be made are not sufficient in all cases.

. However, it has been possible to remedy this deficiency in that the extraordinarily reactive and leading to the formation of water-soluble complex compounds tending copper hydroxide converted into a much more stable copper silicate which differs only slightly in color from the copper hydroxide. That this transformation easily and with a high reaction speed. by simple treatment of the copper hydroxide with moderately dilute water glass solution would be achieved, was not easily foreseen, but is, undoubtedly, one for the solution of the The technical task posed is an important and very favorable moment. ' The proof, that this reaction, as it is stated here, is prompt and sure runs, was determined by quantitative analysis of the pure, fresh with caustic soda Copper hydroxide precipitated from copper chloride without the addition of cement and carefully washed out prepared by conversion with dilute waterglass solution, again .carefully washed out and then dried at 100 ° C. - copper silicate in perfect condition Way provided. At the same time, this pure copper silicate represented it can be shown that it does not give off any detectable traces of copper in water so it is not soluble in water.

If cement is mixed with water and copper chloride in suitable proportions and, after more or less advanced setting, the mass with thinned Treated water glass solution, not only does the described formation of copper silicate occur one, but at the same time also that of S. Lehner in his book "Die Imitationen" discussed silicification that too a hardening and sealing of the Cement mass leads specifically to their surface and the durability of the product increased in a favorable manner.

Practical example of blue-green silicate paint in a swimming pool of an outdoor pool In a clear solution of 2 kg of technical crystallized copper chloride in 10 l of water, with constant stirring, 20 kg of white become more opaque by sieving Cement freed from lumps is introduced and stirred until smooth. The mixing ratio of cement and water is somewhat dependent on the properties of the cement. It should be chosen so that the paint becomes silky. You will instantly be with one wide whitewash brush on the previously very carefully possibly with chlorine solution and scrubbing brush cleaned and rinsed with water, but only damp walls or also the bottom of the container made of concrete was evenly spread without any excess running off and should be processed within 3 hours. After setting has occurred and after the surface has become dry, the paint is coated with a dilute waterglass solution (1 volume of commercially available liquid water glass with a content of about 3o to 33% sodium silicate mixed with 2 vol. water) evenly impregnated, which is best done by sprinkling is done with the water glass solution, for example with the help of a vine sprayer. Here is the To be sprayed amount of waterglass solution to measure that .the solution to the Walls does not drain and does not puddle on the floor. After about 24 hours can you spray the paint with a soft jet of water, whereupon the basin with the bath water can be filled and used. Second example As well like a water-resistant, light blue-green glowing silicate paint for walls and the bottom of a water tank can be plastered for the same purposes with the same favorable properties. The necessary plastering mortar is obtained by intimately mixing 1 part of the volume of slowly binding white cement with 2 room parts white, moderately fine, sharp-edged quartz sand and adding as much aqueous copper chloride solution as 2 kg of technical copper chloride in 1o of water contains dissolved, @ that when working through a thick pulpy; more suitable for plastering work Mortar is created. This mortar is then in the usual way on the still somewhat Fresh or at least well moistened concrete applied, smoothed and rubbed off. It must be kept moist during the following hardening time. Does he have enough set, it is silicatized by spraying with dilute waterglass solution, which has to be repeated several times at intervals of 1 to 2 days. Then he'll get through Hosed down with water, washed off, whereupon the plastered container is in use can be taken.

Third example A modern construction in Portland cement concrete Swimming pool made with smooth cement, its walls and floor in use If it has become blotchy and attractive, it is first removed with a jet of water Use a scrubbing brush to remove coarse dirt and sweep it out with chlorine lye and again thoroughly cleaned with the water jet. Then first a thin one White portland cement slurry applied with a wide whitewash brush. When this primer has set but not yet fully set, a second and third coats of the same kind applied so that the surface is as close as possible even: appears covered. After the paint has dried on the surface the same is done with an approximately 10 percent aqueous solution of copper chloride Spray evenly impregnated with a vine sprayer, 'whereby the amount of .der Copper chloride solution is to be measured in such a way that it does not run down the walls and does not puddle on the ground. Once the copper solution has been absorbed and dried, the paint is silicatized by spraying it with a dilute waterglass solution.

The progress made by the new method of producing a cheap, underwater durable, beautiful colored, blue-green paint for walls and floors of water tanks compared to the previous state of the art in this field brings is on the one hand an economic one; on the other hand a technical one.

In economic terms, it has the advantage that it is for the expensive, previously for water tanks of various types, such as swimming pools, baths, Reservoirs, fountains, aquariums, etc., used wall coverings or oil paint: e a much cheaper, submerged paint or plaster is available represents whose coloring the beauty and liveliness shone through more deeply Has layers of perfectly pure water.

In technical terms is an essential one progress has been achieved in that the coloring component of the mass by transfer of the copper hydroxide primarily formed during the treatment of the cement with a copper salt solution in a copper silicate the inclination and ability has been withdrawn, with that in, used Bath water regularly contained organic substances and water-soluble ammonia derivatives To form complex compounds. The copper silicate produced thus stands out against the copper hydroxide is characterized by a considerably increased water resistance.

Claims (1)

PATENT CLAIM: Process for the production of a cheap, underwater durable, colored silicate paint on concrete, characterized in that as possible lighter, preferably whiter; Cement mixed with water in a known manner with a copper salt solution colored and, after the setting, optionally applied to the walls Has used mass, is soaked with appropriately diluted waterglass solution.