Production of iron mica of micron size grade

FIELD: chemistry.

SUBSTANCE: natural mechanically milled iron (III) oxide of lamellar structure at least 50 wt %, preferentially 75 wt %, contains particles sized 10 mcm and less in amount, at least, 50 wt %, preferentially 70 wt %, particularly preferentially 90 wt %. The ratio of thickness to maximum diametre of iron (III) oxide plates is 1:5, preferentially 1:10. To produce such iron (III) oxide, it is mechanically milled in an impactor or a jet-type mill. Iron (III) oxide resulted from mechanical milling, is separated by size grade, e.g. by an air separator. Iron (III) oxide can be used in lacquering for a base corrosion protection, mechanical load protection, UV and IR protection, for decorative coating, and also as an extender for polymeric and ceramic materials.

EFFECT: possibility to prepare highly dispersed lamellar particles of natural iron oxide.

15 cl

 

The invention relates to iron oxide (III), lamellar structure which is at least 50 wt.%, preferably 75 wt.%.

In addition the invention concerns a method of obtaining a plate of iron oxide (III) and the use of this oxide.

Iron oxide (III) contains, as a rule, the crystals from red to black. His paramagnetic modification referred to in Mineralogy hematite. Hematite may contain fine-flaked, tabular, tabular and compact crystals and grains or particles. Due to its fine-flaked, tabular and lamellar structure of iron oxide (III) is known on the market under the name "iron oxide" (Fe-oxide).

In this case, the plate structure is understood, fine-flaked, tabular structure of iron oxide (III).

Iron oxide (III) with such a structure can be applied in many areas in which effective is the plate form crystals. This applies in particular to the coating, painting, etc. of the different types, and iron oxide (III) is often introduced as a pigment in an appropriate binder and is used for applying a coating to the substrate, for example, steel. Due to the presence of lamellar particles of iron oxide (III) the coating has a barrier and shielding effects, increased strength is and abrasion, and the paint layer is formed of increased thickness. Under the barrier and shielding effects is usually defined as the resistance of the coatings. Usually, it is achieved due to the fact that in the coating on the base plate of the iron oxide (III) are almost parallel to the substrate surface and overlap each other. What prevents the rapid penetration of corrosive substances (barrier effect). Simultaneously prevents rapid damage to the base and binder other environmental factors such as ultraviolet and infrared radiation, temperature extremes (shielding effect).

An additional positive effect is the increased resistance to mechanical loads. Due to the evaporation of solvents from the coating, wetting and drying, and under the action of mechanical loads normal coverage is able in a short period of time to fail. Thanks to the strengthening coating layer lamellar iron oxide (III) can be effectively withstand such loads.

Up to this time there was a problem with the fact that iron oxide (III) can be prepared while maintaining the lamellar structure only when the content of particles with a size of up to 60 or 50 μm. In the extreme case, the particle size could be reduced to 30 μm, but only particles of more than 30 MK is were undamaged plate. Therefore, the above advantages of lamellar iron oxide (III) could be used up to the present time only in the presence of particles larger than 30 microns. The oversize of the iron oxide (III) with a particle size less than 30 microns could conventionally be used in small quantities, however, it was considered a marriage. Especially unsuitable for coatings were iron oxide (III) with a smaller particle size, as hitherto he had been employed as a mixture of grains with a very small fraction of particles with a lamellar structure and a positive properties, due to the lamellar structure, could not appear.

Therefore, the object of the invention is the provision of opportunities for a wide cheap use of iron oxide (III) with plate structure, and should be provided with the content of the lamellar particles in the smaller size classes.

This task is solved according to the invention due to the fact that iron oxide (III) a particle size less than 30 microns comprise at least 50 wt.%, mostly 70 wt.%, particularly preferably 90 wt.%. The target product with a high content of lamellar iron oxide (III) with a particle size less than 30 μm, it becomes high quality and has applicability. You can strive to target the product to be able to content the th of about 90 wt.% lamellar iron oxide (III) with a particle size less than 30 microns. This is effective, for example, for coatings, such as lacquer or the like, as improved barrier and screen effects, and resistance to abrasion. Also the resistance to mechanical load, fluctuations in environmental conditions such as temperature, humidity, dryness, etc. can be significantly increased. When observing the corresponding distribution of particle size can be achieved with a high degree of compaction of the particles of iron oxide (III) in varnishes, resulting in high resistance varnish to mechanical loads. Compliance with specified maximum particle size and distribution of particles by size in the target product can be effectively controlled by the curve of particle size distribution. It is quite natural that may contain particles with submicron size range. Depending on the destination of iron oxide (III) the latter can be prepared with particles of any range of particle size. Preferred are, for example, ranges from 5 to 25 μm, 1-20 μm, or other ranges, in which the maximum of the particles have a size less than 30 microns. Needless to say that and lower limits of the particle size can be in the submicron range. In technical language materials class size particles - including in the examples above - referred to as 5/25 1/20 etc.

High quality and usability can be further improved if you apply the iron oxide (III) with a particle size of 20 μm or less. Iron oxide (III) can also be used with a particle size of 10 μm or less, preferably 5 μm or less.

According to another characteristic of the invention, iron oxide (III) is subjected to mechanical grinding. As a rule, iron oxide (III) is brought to micron size or crushed, and mechanical grinding may be carried out preferably by using the following methods.

Iron oxide (III) can occur from natural deposits or have an artificial origin, and the same fitment has a mixture of oxides of iron (III) natural and artificial origin. Synthetic iron oxide (III) can be obtained by various known methods. For example, can be applied thermolysis of compounds of iron, such as ferric sulfate, or oxidative methods in aquatic environments, as a way of Penniman-Sofa or aniline method, or methods to obtain iron oxide (III) as a pigment. Synthetic iron oxide (III) can also be obtained by dissolving, for example, iron scrap in the corresponding acid with subsequent controlled translation in the sludge under pressure and the presence of a protective atmosphere (e.g., nitrogen atmosphere).

Suppose the equipment, to iron oxide (III) artificial origin was obtained by growing the crystal, usually from a solution of iron oxide in known conditions (see above). Crystals of iron oxide (III) are grown up to the maximum size of the particles according to the invention. Alternatively, it is also possible to grow larger crystals, then subjected to mechanical grinding up provided by the invention the particle size. When crystal growth is necessary in any case to control the education and preservation of the lamellar structure of crystals of iron oxide (III).

For the job and the characteristics of the lamellar structure of iron oxide (III) can be used, the ratio of external parameters. Under it in the framework of the present invention is the ratio between the thickness or height and maximum width or length of a particle or plate particles of iron oxide (III). To determine the ratio of external parameters is used primarily particle of iron oxide (III) the maximum class size, i.e. the limit, equal to about 30 microns. For iron oxide (III) according to the invention the ratio of external parameters (thickness/maximum diameter) plates particles of iron oxide (III) with a maximum class size equal to mainly 1:5, preferably 1:10 is particularly effektivnym to ensure wider application.

The objective of the invention is also solved by a method of obtaining a plate of iron oxide (III) according to the invention, in which the iron oxide (III) is subjected to the cutting effort, as is the case in known disk mill. During this treatment, the particles of iron oxide (III) crushed by friction.

Iron oxide (III) is made in the form of a mixture of iron oxide (III), obtained from natural by means of mechanical grinding, and iron oxide (III) artificial origin.

Alternatively, the iron oxide (III) may be machined into the impact mill or known jet mill and then reduced to the size of the particles according to the invention, while providing a lamellar structure. In this case, can be used in the expansion of steam to accelerate particles of iron oxide (III) in the mill.

It is preferable that the oxide of iron (III) as a result of mechanical grinding is divided according to the size of the particle or grain size of the grains.

It is appropriate that the iron oxide (III) as a result of mechanical grinding through the air separator is divided according to the size of the particle or grain size of the grains.

It was found that the above-mentioned methods provide gentle and effective mechanical grinding h is STIC iron oxide (III) to obtain the desired particle size. The overwhelming majority of chopped thus particles of lamellar structure was suddenly not destroyed.

No matter which method, after the mechanical grinding of iron oxide (III) should be divided into separate factions, classes or ranges of particle size to obtain iron oxide (III) according to the invention for further processing. This can be used as a separator device, such as an air separator, centrifugal separator, etc. and other devices to separate.

For the application of iron oxide (III) according to the invention there are ample opportunities. It was found that the iron oxide (III) according to the invention is equally well suited for coatings, such as lacquer serving to protect the foundations from corrosion and coatings to protect the foundations from mechanical loads or coatings to protect the foundations from light, i.e., ultraviolet and infrared radiation. It was also found that by means of iron oxide (III) according to the invention can be significantly improved adhesion of the coating to the substrate even in the intermediate layers of the coating. Protective properties can be improved substantially as a whole, regardless of the type of binder in the iron oxide (III). This increases the maximum permissible load and increases the service life of the coating. In the operation of the framework can be applied to metal and non-metal surfaces items and much more. It was found that the iron oxide (III), according to the invention, is particularly effective as a pigment for paints, dyes, etc. intended for external application to steel structures.

Also with the help of iron oxide (III) according to the invention can be enhanced optical effect coatings, i.e. decorative coating, such as boats, boards for riding the waves, decorative items and much more.

However, the scope of application of iron oxide (III), according to the invention, is not limited to coatings, it can be used up to the fillers in the production of polymers. As polymeric products are meant polyethylene, polypropylene, polyamide, fiberglass-reinforced plastics and other substances.

Additionally, it has been unexpectedly discovered that the properties of iron oxide (III) according to the invention, such as barrier and screen effects, protection against mechanical loads, optical effect, etc. that can effectively be used in products for the ceramic industry. So, for example, iron oxide (III) is an excellent additive, for example, as a pigment for ceramic materials used, for example, for the manufacture of sanitary products, such as tiles, sinks, etc.

In addition to those listed in the scope of application, iron oxide (III) according to the invention can be used in numerous other fields in which it is effective lamellar structure of iron oxide (III) with particles of small size class.

1. Natural mechanically crushed iron oxide (III), lamellar structure which is at least 50 wt.%, preferably 75 wt.%, characterized in that it contains particles smaller than 10 μm represent at least 50 wt.%, preferably 70 wt.%, particularly preferably 90 wt.%.

2. Iron oxide (III) according to claim 1, characterized in that it contains particles of 5 microns or less.

3. Iron oxide (III) according to claim 1 or 2, characterized in that the ratio of thickness to a maximum diameter of plates of iron oxide (III) is essentially 1:5, preferably 1:10.

4. Iron oxide (III) according to claim 1, characterized in that it is made in the form of a mixture of iron oxide (III), obtained from natural by means of mechanical grinding, and iron oxide (III) artificial origin.

5. Iron oxide (III) according to claim 2, characterized in that it is made in the form of a mixture of iron oxide (III), obtained from natural by means of mechanical grinding, and iron oxide (III) artificial origin.

6. Iron oxide (III) according to claim 3, characterized in that it is made in the form of a mixture of iron oxide (III)received and the natural by means of mechanical grinding, and iron oxide (III) artificial origin.

7. A method of obtaining a plate of iron oxide (III) according to any one of claims 1 to 6, characterized in that the iron oxide (III) mechanically ground in an impact mill or jet mill.

8. A method of obtaining a plate of iron oxide (III) according to any one of claims 1 to 6, characterized in that the iron oxide (III) as a result of mechanical grinding is divided according to the size of the particle or grain size of the grains.

9. A method of obtaining a plate of iron oxide (III) according to any one of claims 1 to 6, characterized in that the iron oxide (III) as a result of mechanical grinding through the air separator is divided according to the size of the particle or grain size of the grains.

10. The use of iron oxide (III) according to any one of claims 1 to 6 for coating, such as varnish, to protect from corrosion to the base.

11. The use of iron oxide (III) according to any one of claims 1 to 6 for coating, such as varnish, to protect the foundations from mechanical loads.

12. The use of iron oxide (III) according to any one of claims 1 to 6 for coating, such as varnish, to protect the foundations from the light.

13. The use of iron oxide (III) according to any one of claims 1 to 6 for application of decorative coatings on articles, such as boats, boards for riding the waves, and decorative items.

14. The use of iron oxide (III) according to any one of claims 1 to 6 in the form of fill the El polymer products, such as polyethylene, polypropylene, polyamide, fiberglass-reinforced plastic.

15. The use of iron oxide (III) according to any one of claims 1 to 6 as an additive in ceramic materials.



 

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