What role does iron oxide play in cosmetics

When choosing cosmetics, you should consider the following two aspects:

1.The quality of cosmetics.

First of all, the most important thing in choosing cosmetics is to see if the quality is ***. Generally speaking, it is better to choose famous factories and brand-name cosmetics, because the equipment of famous factories is good, the product standards are high, and the quality is high, and brand-name products are generally trustworthy products and are relatively safe to use. Do not buy cosmetics without manufacturers and trade marks, and pay attention to whether the product has an inspection certificate and production license to prevent counterfeiting.

Also pay attention to the production date of cosmetics, generally cream, cream, honey products as far as possible within one year of the factory.

Secondly, learn to recognize the quality of cosmetics.

Recognize by appearance: Good cosmetics should be brightly colored, elegant and soft. If you find that the color is dark and dirty, and the shades are different, it means that there is a problem with the quality. If the appearance is turbid, the oil and water are separated, or there is flocculent, and the paste is dry and cracked, it cannot be used.

Identification from the smell: the smell of cosmetics is some elegant, some strong, but all are pure. If it smells pungent and strange, it means that it is a shoddy or spoiled product.

Identification from the feeling: take a little makeup and gently apply it to the **, if it can be evenly and tightly attached to the skin and has a smooth and comfortable feeling, it is a delicate texture of cosmetics. If there is roughness, stickiness, or even itchiness and dryness after application, it is inferior cosmetics.

2.Personal and environmental factors in the selection of cosmetics, in addition to the quality of the cosmetics, but also take into account the user and environmental factors.

According to the type: oily** people, to use a clean lotion skin care products; People with dry skin should use nutritious moisturizing skin care products; People with normal skin should use gentle skin care products.

According to age and gender: children are young and tender, with little sebum secretion, and special skin care products for children must be used; The elderly** atrophied, dry and thin, should choose skin care products containing oil, moisturizing factors and vitamin E and other ingredients; Men should choose men's skincare products.

Depending on skin tone: When choosing cosmetics such as lipstick, eye shadow, foundation, nail polish, etc., it is important to match the shade of your skin tone. People with fair skin should choose cosmetics with sun protection.

Depending on the season: Depending on the season, the cosmetics used will vary. In the cold season, it is advisable to use cosmetics with moisturizing and moisturizing properties, and in summer, it is advisable to use lotions or powders.

Red pigment. In fact, many colors are metal oxides or compounds......

Iron oxide is ferric oxide, and its chemical formula is Fe2O3.

There are two preparation methods (wet and dry):Wet

feso4+2naoh=fe（oh）2+na2so44fe（oh）2+o2+2h2o=4fe（oh）34feso4+4h2o+o2=2fe2o3↓+4h2so4fe+h2so4=feso4+h2↑

A certain amount of 5% ferrous sulfate solution is quickly reacted with excess sodium hydroxide solution (excess alkali is required, and air is introduced at room temperature to make it all turn into a reddish-brown iron hydroxide colloidal solution, which is used as the crystal nucleus for depositing iron oxide. With the above-mentioned crystal nucleus as the carrier, with ferrous sulfate as the medium, the air is introduced, in the presence of metallic iron, the ferrous sulfate reacts with oxygen in the air to generate iron oxide (i.e., iron red) deposited on the crystal nucleus, and the sulfate in the solution reacts with the metal iron to regenerate ferrous sulfate, and the ferrous sulfate is oxidized into iron red by the air and continues to be deposited, so that the cycle ends to the end of the whole process, and the red iron oxide is generated.

Dry process

Nitric acid reacts with iron to form ferrous nitrate, which is cooled and crystallized, dehydrated and dried, and calcined at 600 700 for 8 10h after grinding, and then washed, dried and crushed in water to obtain iron oxide red products.

4Fe(NO3)3 2Fe2O3+12NO2 +3O2 Fe2O3·NH2O Fe2O3+NH2O can also be used as raw material for iron oxide yellow, which is calcined at 600 700 to obtain iron oxide red.

The color of iron oxide is reddish-brown powder. Iron oxide is easily soluble in strong acid, medium strong acid, its reddish-brown powder is a low-grade pigment, industrially called iron oxide red, used in paint, ink, rubber and other industries, can be used as a catalyst, glass, gemstones, metal polishing agent, can be used as ironmaking raw materials.

Iron oxide reacts with acid to form iron salts and water. Example: Fe2O3+6HCl=2FeCl3+3H2O

Thermite reacts to aluminium mixed with iron oxide to form thermite, which is heated to form alumina and iron. Chemical formula: 2Al+Fe2O3= =Al2O3+2Fe

Carbon and carbon monoxide reducing iron oxide can be mixed with carbon and heated, and iron and carbon dioxide are extracted. Chemical formula: 3C+2Fe2O3=High Temperature=4Fe+3CO2

In moist air, ferric oxide is easily oxidized to ferric oxide. 4fe3o4+o2==6fe2o3

Iron can be mixed with carbon monoxide and heated to produce iron and carbon dioxide. Chemical formula: 3CO+FE2O3=High temperature=2FE+3CO2

The cosmetics industry uses this product to make a variety of pigments. Because it is non-toxic, waterproof, it does not blew or drain, and it is an ideal additive for cosmetics such as mascara, foundation and eyeshadow. There are two different types of compounds used in the cosmetics industry:

Iron oxide II with black pigment and iron oxide III with red color.

In the art world, it is used to make pigments such as burnt ochre and burnt umber. Since prehistoric times, the method of making pigments in the color of paint has been used. Lascaux's cave paintings are an example of the use of time in the creation of art.

Iron Oxide Uses:

It is used for coloring paints, rubber, plastics, construction, etc., and is an inorganic pigment used as an anti-rust pigment in the coating industry. It is used as a colorant for rubber, artificial marble, terrazzo on the ground, a colorant and filler for plastics, asbestos, artificial leather, leather polishing paste, etc., a polishing agent for precision instruments and optical glass, and a raw material for the manufacture of magnetic materials ferrite and body components.

It is used in the electronic industry, communication equipment, televisions, computers and other magnetic raw materials, as well as line output transformers, switching power supplies and ferrite cores such as high U and high UQ.

Iron oxide chemistry.

Iron oxide reacts with acid to form iron salts and water. Example: Fe2O3+6HCl=2FeCl3+3H2O

Thermite reaction. Aluminum is mixed with iron oxide to form a thermite agent, which is heated to form alumina.

and iron. Chemical formula: 2Al+Fe2O3= =Al2O3+2Fe

Carbon, carbon monoxide.

Reductive iron oxide can be heated after mixing with carbon, iron and carbon dioxide.

Extract it. Chemical formula: 3C+2Fe2O3=High Temperature=4Fe+3CO2

In humid air, iron tetroxide is sold.

It is easily oxidized to ferric oxide.

4fe3o4+o2==6fe2o3

Iron can be mixed with carbon monoxide and heated to produce iron and carbon dioxide. Chemical formula: 3CO+FE2O3=High temperature=2FE+3CO2

Uses Iron oxide is mainly used as metal manuscript macro iron.

Masterbatches and colorants are also used to make iron oxide red.

pigments, mostly used in automobiles, of which iron oxide red detailed uses:

1. Iron oxide red pigment is used as a pigment or colorant in all kinds of concrete, and is directly transferred into cement for application. A variety of indoor and outdoor colored concrete surfaces, such as walls, floors, ceilings.

pillars, porches, pavements, parking lots, stairs, stations, etc.; All kinds of architectural ceramics and glazed ceramics, such as face tiles, floor tiles, roof tiles, panels, terrazzo.

Mosaic tiles, artificial marble, etc.

2. Iron oxide pigment iron oxide red is suitable for coloring and protective substances of various coatings, including water-based interior and exterior wall coatings, powder coatings, etc.; It can also be applied to oil-based paints, including epoxy, alkyd, amino and other primers and topcoats; It can also be used for toy paint, decorative paint, furniture paint, electrophoretic paint and magnetic paint.

3. Iron oxide red is suitable for the coloring of plastic products, such as thermosetting plastics and thermoplastics, and the coloring of rubber products, such as automobile inner tubes, aircraft inner tubes, bicycle inner tubes, etc.

Fourth, iron oxide red is widely used in construction, rubber, plastics, coatings and other industries, especially iron red primer has anti-rust function, can replace the best red paint, save non-ferrous metals. It is also a high-grade fine grinding material, which is used for the polishing of precision five-absolute gold dismantling instruments and optical glass. The high purity of the bond field is powder metallurgy.

It is used to smelt various magnetic alloys and other high-grade alloy steels. Made of ferrous sulfate.

or iron oxide yellow or foot iron mixed with high temperature calcination, or directly from the liquid medium.

5. Red is mainly used in the building materials industry for colored cement, colored cement floor tiles, colored cement tiles, and imitation glazed tiles.

Concrete floor tiles, colored mortar, colored asphalt, terrazzo, mosaic tiles, artificial marble and wall painting, etc.; In the paint industry, it is mainly used to manufacture various paints, coatings and inks. In other industries, such as ceramics, rubber, plastics, leather polishing pastes, etc., are used as colorants and fillers.

6. It is used for coloring paints, rubber, plastics, buildings, etc., in addition, iron oxide pigments can also be used for coloring all kinds of cosmetics, paper and leather.

Chemical formula: Fe2O3

Aliases: ferric oxide, iron red, iron dan.

Physical. General traits: reddish-brown powder.

Melting Point: 1565

Relative twig tremor (water = 1):

Solubility: insoluble in water, soluble in acid.

Form of existence. Minerals: hematite, ochre.

Ferric oxide is the main component of rust.

Chemical properties. Standard enthalpy of formation: kj mol

Method. Ferric oxide can be obtained by burning ferrous compounds or iron hydroxide in the air.

Use. 1.Its reddish-brown powder is a kind of low-grade pigment, which is called iron oxide red in industry, and is used in paint, ink, rubber and other industries.

2.It can be used as a catalyst.

3.Polishes for glass, gemstones, metals.

See other oxidation slag residues of iron: ferrous oxide, ferric tetroxide.

Chemical formula: Fe2O3

Aliases: ferric oxide, iron red, iron dan.

Physical. General traits: reddish-brown powder.

Melting Point: 1565

Relative masking density (water = 1):

Solubility: insoluble in water, soluble in acid.

Form of existence. Minerals: hematite, ochre.

Ferric oxide is the main component of rust.

Chemical properties. Standard enthalpy of formation: kj mol

Method. Burning ferrous compounds or iron hydroxide in the air can obtain trioxygen and eliminate two absolute irons.

Use. 1.Its reddish-brown powder is a low-grade pigment, which is called iron oxide red in industry, and is used in paint, ink, rubber and other industries.

2.It can be used as a catalyst.

3.Polishes for glass, gemstones, metals.

See other oxides of iron: ferrous oxide, ferric tetroxide.