DE671649C - Process for the production of reflectors u. Like. For lighting purposes - Google Patents

Description

Process for making reflectors and the like for lighting purposes The invention relates to a method for producing reflectors o. The like. For Lighting purposes as well as objects manufactured according to the process.

Reflectors for lighting purposes should reflect the light back with as high an efficiency as possible and with good distribution. b In addition to this purely technical lighting task, it should be noted that when the lighting fixtures are attached to the ceiling or on supports and as a result of the generation of heat, dust and dirt particles are swirled against the radiating surface. The reflectors are also exposed to strong temperature differences.

It is known to produce reflectors from plaster of paris with a layer of lacquer is provided. When cleaning, however, undesirable abrasion forms, and plaster of paris bodies of this type are difficult to pack because of their fragility. It Metal reflectors are also known, which are sprayed with appropriate Farhen. The disadvantage here is that a yellow to brown color occurs during use, so that the objects, if not unusable, at least unsightly will.

Eniaill reflectors are also known. With these, however, the surface is fluffy or frizzy; In addition, the enamel easily cracks or cracks. With the invention, all of the disadvantages outlined are avoided and the efficiency, in particular when using el ZD white colors, is improved by up to over 30%. While the known reflectors have an efficiency of about 60 to 70% , this is 82% and more in reflectors according to the invention. In addition to the increased light effect, which occurs through greater and more permanent whiteness, packaging is also made easier. For example, while plaster reflectors, in which a diameter of 1.30 in is not unusual, a special box is necessary for each reflector when shipping, several reflectors can be packed in a box of approximately the same size according to the invention, since there is no risk of breakage exists, a jump can still take place.

The method according to the invention consists in that on metallic Base body, in particular iron, mineral paints are applied in a special way. Particularly good white bodies are available among the mineral colors, such as barium salts, z. B. barite white, also titanium oxide, titanium dioxide and corresponding under the name Tita; nwe # ß known mixtures. The Minera.I colors are made with binders containing water glass applied, most advantageously by brushing and spraying. the Use of mineral paints containing water glass for reflections and spreads .st known per se. However, the application to metals, especially iron, was successful not in a satisfactory manner, and the colors were even considered not to be for iron Usable because corrosion appeared inevitable and also the durability unsatisfied, even if galvanized sheet iron formed the basis. This Prejudice is also overcome with the invention. If for price reasons as Iron, which does not need to be galvanized, is also preferred, so. can for the specified purposes also z. B. aluminum, brass and other metals or M metal alloys are used.

The manufacture of reflectors for lighting purposes is on hand of the following example explained in more detail: A correspondingly shaped base body iron is carefully degreased and cleaned, then to prevent Corrosion z. B. stripped or burnished. On the _object prepared in this way A binding agent containing water glass is applied and allowed to harden (silicification). While the following paint jobs z. B. can be done by spraying, it is advisable to use the water-glass-containing binder only with a brush or fiber-free Apply fabric.

After this application has hardened, a first application of paint is carried out, for which the following composition has proven to be advantageous: 75 parts of barite white,: 25 parts of titanium white in 150 parts of water-glass-containing binder. After this paint application has hardened, the next spraying is carried out with a mixture of 50 parts of barite white and 50 parts of titanium oxide in appropriate amounts of binder. After even this order is confirmed, finally, a mixture of 5o parts titanium oxide is applied in ioo parts binder, the mineral colors advantageously very fine ground overall.

The individual coats are affected by the silicification that occurs excellently combined with one another, so that there is an impact-resistant paint application with the excellent properties described above and increased lighting effect, which is insensitive to abrasion, no crack formation with temperature differences and maintains its dazzling warm whiteness even during operation. In connection to the last application of paint or simultaneously with it can add to the dispersion The light-ground crystal splinters, the finest glass beads or the like -be embedded.

Claims (3)

PATENT CLAIMS: i. Process for the manufacture of reflectors for lighting purposes using mineral paints containing water glass Binders, characterized in that the metallic, in particular made of iron Existing basic body well degreased and cleaned, then pickled or burnished whereupon waterglass-containing binders, in particular, on the base prepared in this way Brushed on and dry (Kiesü.ln) ,. , can be left to then a Coating or several coats of mineral paints with binders containing water glass In the latter case, the paint jobs each take a reasonable amount of time for silicification is to be granted. : 2. A method according to claim i, characterized in that a mixture of about 7 parts of barite white, about 25 parts of titanium white and about 150 parts of binding agent is applied to the first water glass coating after it has hardened, and after it has hardened another paint with a mixture of about 50 parts of barite white , about 50 parts of titanium oxide and corresponding binders are carried out in order to apply a mixture of about 50 parts of titanium oxide in about 100 parts of binders after repeated hardening. 3. Reflector according to claim 2, characterized in that the water-glass-containing mineral paint contains barite white, titanium white and, in particular in the outermost coat, titanium oxide in repeated coats.