DE693816C - Paints - Google Patents

Description

Paints The subject matter of the invention is the specific composition of using alloys and / or mixtures of silicon with aluminum paints produced as pigments in a state of finest distribution. To An older suggestion is the use of powdered alloys or mixtures of silicon. with aluminum with a content of at least 5% silicon Manufacture of paints placed under protection. According to this, in particular Such alloys are used, which by thermal reduction of aluminum oxide and Silica-containing substances with coal or as silicon-rich by-products when processing in this way. obtained alloys are obtained. This older process and the paints obtained thereafter are extended However, the present invention does not.

The paints according to the invention are characterized by that they are about 25 to 60 per cent. aluminum = silicon pigment in the extremely finer state Distribution in conjunction with about 25 to 70% of known binders, if appropriate in the presence of common additives such as diluents, mineral fillers.

The pigment should generally be used in a state of so extensive division that it is completely or at least for the most part, e.g. B. to 90 % , through a sieve with about 10000 meshes per square centimeter hinduzch walks. The degree of division is advantageously carried out so far that the main amount can be driven through a sieve with about 16,000 meshes per square centimeter and the remainder through a sieve with about 10,000 meshes per square centimeter.

The with the paints according to the invention, for. B. on metals, such as iron, light metals, or coatings made on wood, masonry distinguished by their pleasant warm gray-brownish hue, by their Durability, their excellent resistance to corrosive effects of various kinds, their excellent smoothness, adhesive strength and mechanical Resilience as well as theirs excellent evenness and Tightness. Another major advantage is their excellent elasticity, Toughness and elongation even when aged.

The paints according to the invention and those produced therewith Coatings; in which the pigment particles are in the form of an extremely homogeneous Dispersion contained in the dispersant used are also excellent due to an excellent hiding power, which is particularly suitable for z. B. rob metal surfaces; z. B. cast surfaces, a particularly extensive protection against the corrosive Influences of the atmosphere and corrosive gases and liquids such as water or salt water, e.g. $. Lake water, granted. You will find therefore with particular advantage Also used as a rust preventive.

Another advantage of these paints is that they when applied to the surface to be provided with the protective coating, e.g. B. such made of metal - do not tend to run off.

The production of the new paint takes place, for. B. such that one aluminum-silicon pigment in the state of very extensive, e.g. B. by accordingly extensive marriage; Sieving or sifting achieved division in a usual Binders, e.g. B. Boiled linseed oil; Wood oil, the latter especially in connection with other known binders, finely divided. Advantageously, for. B. Copals or other natural or synthetic resins in addition to other known oily binders or without such and diluents, e.g. B. Petroleum, gasoline, benzene, Turpentine, can be used. The drying process is generated by wood oil Coatings accelerate and improve the properties of the film in several ways, z. B. by changing the swellability and increasing the resistance against chemical influences, improved. Resin-like substances such as copal cause rapid hardening and densification of the coatings after application of the paint.

In general, the proportions of the amounts of the individual ingredients used, e.g. B. the binders, diluents and customary additives, from case to case according to the requirements to be placed on the coatings produced in each case, eg. B. with regard to their resistance to attack by the atmospheric lilies. For example, in the case of using wood oil and copal, e.g. B. in connection with linseed oil, use these substances in the different amounts and proportions shown in the following table, depending on the coating produced, ordinary or mild atmospheric or other influences (column a) or strong chemical or atmospheric influences (column b) or particularly strong chemical or mechanical influences or the effects of liquids (column c) or the influences of sea air or sea water (column d) or, finally, the influences of high temperatures, e.g. B. from 25o to 300 ° C (column e), is to be suspended. . blackboard Wood oil and copal as a percentage of the total binder before boiling Condition (a) (b) (c) (di (e) 111, n In o ln nl n , 011 n Wood oil ........................ 8bisr2 xobisz5 15bis25 5bisz5 2obis? 5 Copal ......................... - 1o - 15 15 --25 35 - 50 20 - 25 This table shows that the addition of wood oil and copal generally increases with increasing chemical exposure. In contrast, when exposed to sea air and sea water, relatively little wood oil and a lot of copal should be used. High temperatures require particularly large amounts of both wood oil and copal. .

For the required good mixing of the aluminum-silicon pigments with the remaining components of the paint can machines or other Devices of the type customary in the paint and varnish industry Find. E.g. you can first put the pigment in a kneading machine with a binder combine and then the kneaded mass in a Schnellaufmühle, z. B. one Treat the colloid mill further to achieve a completely homogeneous mixture.

The ratio of the components in the aluminum-silicon pigments used can vary within wide limits. In general, the aluminum content, as well as the silicon content, can be between about 5% and about 95 %. Products which contain about 30 to 68% aluminum or about 30 to 68% silicon are used with particular advantage. As extremely suitable, especially for the production of rust-protecting coatings on iron and steel, are, for. B. called those with about 4.5% aluminum and 53 0/0 silicon.

The amounts of impurities present in the pigment are maintained generally from about a 0/0 to about 6 0/0 of the weight of the pigment, on average to about q.0 / 0, but much larger quantities, e.g. B. such up to about 2011.

The addition of inert mineral fillers has proven to be advantageous. Examples which may be mentioned as suitable are: Silica-containing substances or silicates, such as kaolin, china clay. Satisfactory results can be obtained, as experiments have shown have e.g. B. achieve when using additives of about zo 0/0 to about 350 / " advantageously from about 25% of the fillers mentioned. The addition of such substances has a particularly beneficial effect as it causes the paint to run off, especially on vertical smooth surfaces, is effectively avoided. Also will thereby a premature separation of the liquid from the solid components largely prevented. Particularly favorable results are achieved when using such Additives such as kaolin and china clay, asbestine, * in as dry a condition as possible.

As has already been said, the mutual relationship depends on the one to be applied Components of the paints according to the invention from the in the individual case to the Paints or the coating produced with them. - Of the influences to be taken into account here, the following are for example called: z. the atmospheric conditions of the internal climate, z, the atmospheric Conditions of a maritime climate, 3, the strength of solar radiation, -q .. Influences of acidic substances, such as smoke and exhaust gases from industrial plants, 5. alkaline action Substances such as caustic soda, ammonia, 6. Exposure to moisture, e.g. B. of lake water on underwater paints, action of the water on the paintwork of the diving bells of gasometers, components of locks, ships, 7. exposure to elevated temperatures, z. B. at. Pipelines or systems or apparatus by conduction or radiation heated, B. Stress from expansion and contraction, vibrations and mechanical pressure, g. Adhesion strength, ro. Drying conditions, e.g. B. the limited time available for drying during brief interruptions in operation.

In general, particularly for the production of protective coatings on metal surfaces, e.g. B. those made of iron and steel, the following proportions have proven to be suitable for the production of a base coat: q.o to 60 ° / 0 (parts by weight) Ahiminium silicon pigment, - - 10 - 15% - kaolin or china clay, 25 - 40% - binders, such as linseed oil, wood oil, copal, 5 - 10% - thinners such as kerosene, gasoline, turpentine oil. For the production of top coats z. B. the following weight ratios are used: 25 to 45 '/,) (parts by weight) aluminum-silicon pigment, 6 - 120/0 - kaolin or china clay, 40 - 70% - binder, ` o - 100/0 - - thinners, such as kerosene, gasoline. Of course, desiccants of the usual type, e.g. B. manganese compounds are used as additives.

A particular advantage of those used in accordance with the invention in Aristrichmittel Aluminum-silicon pigments also contain up to about 60 percent by weight thereof can be incorporated into a binding agent for the production of the paint, while aluminum powder does not contain more than about 25 percent by weight of the binders can be included.

In order to prevent thickening, the paints can be added according to the invention organic, volatile solvents, e.g. B. alcohol, butanol, hexahydronaphthalene, Aniline. .

The addition of lead chromate, e.g. B. in an amount up to about 5 percent by weight, in certain cases, e.g. B. for the invention manufactured Paints for underwater paints, proven to be advantageous. This condition is of particular importance for the use of these paints in marine life.

The application of the products can after any, z. B. in the Anstrichtech »@dz: usual methods take place, z. B. mediated by painting Brush, by dipping, spraying on, has proven to be particularly suitable the use of thermally produced aluminum-silicon alloys for the paints.

Claims (7)

PATENT CLAIMS: i. Paints, e.g. B. for metals, characterized in that that there is about 25 to 6o% of an aluminum-silicon pigment which is at least for the most part through a sieve of about 10,000 to 16,000 meshes per square centimeter goes through and z. B. has a content of 5 to 95% silicon, further about 25 to 70% of one or more known binders and optionally up to 10% of one or more than one known diluent and optionally or up to 35, preferably about 25% of one or more known inert contains mineral filler. 2. Paint according to claim i, characterized in that; that it is about 25 to 45% of an aluminum-silicon pigment, about 40 to 70% of one or more than one binder, up to about 10% of one or more than one diluent and contains about 6 to 12% of one or more than one mineral filler. 3. Paint according to claim i, characterized in that it is about 4o to 6o o / o of an aluminum-silicon pigment, about 25 to 40% of one or more than one $ Binder, about 5 to 10% of one or more than one diluent, about 10 to 35, preferably 10 to 15%, of one or more than one inert mineral Contains filler. 4. Paints according to Claims i to 3, characterized by Use of aluminum-silicon pigments with about 3o to 68% silicon. 5. Paints according to claims i to 4, characterized by the use of an aluminum-silicon pigment with about 45% metallic aluminum and about 53% elemental silicon. 6th Paints according to Claims i to 5, characterized in that the pigment an aluminum-silicon alloy is used, which is obtained thermally has been. 7. Paint according to claims i to 6, characterized by use of mineral fillers containing silicate, such as kaolin, china clay or more such substances. B. paint according to claims i to 7, characterized by a content of about 8 to 12% wood oil, calculated on the total binder the overcooking. G. Paint according to claims i to 8, characterized by one Content of about 10 to 25% wood oil in addition to about 10 to 25% copal, calculated on that entire binder before overcooking. ok Paints according to claims i to 9, characterized by a content of about 5 to 15% wood oil and about 35 to 50% copal calculated on the total binder before cooking: i i. Paints according to claims i to io, characterized by the addition of bleaching hornate, e.g. Am an amount up to about 5%.