A química do fazer, Reações Químicas, Tintas

Look around. Have you ever noticed the variety of colors around us? Blue, red, green, yellow, "Pink-ass-when-run '.

. . Ok, Behave, our program today is not just about color but about a product that has a lot to do with them: ink.

Depending on features like tone and temperature, the colors can express different meanings and feelings. For example, everyone knows that red is the color of the "danger" and "Love" is not it? And who does not know the difference between the cool colors and warm colors?

Well, that means changing the color of objects such as wall here is also a way to print a new identity to them, depending on our aesthetic taste. And therein enters the paint, a key product in our day-to-day. Coloring is actually one of the main functions of the inks, but certainly not the only one.

When painting this wall I'm also protecting it from moisture and weathering. The same is true in the marine industry, for example, where the painting is also a form of protection. And not only that.

In fact, the inks are used for much more than we think. They are in the works of an artist, markings on a highway, and the label of many different products. Not to mention the importance of paints for communication through writing, whether in the form of books or even write a simple message at hand.

Have you already thought about the importance of ink? The use of paint comes from pre-history. Our ancestors already mixed water and color materials such as plants and clay powder, paint manufacturing primitives, used to decorate their caves and tombs.

Over time, new ingredients were added to improve the characteristics of paints. The ancient Egyptians were the first people to paint with a variety of colors, while the manuscripts of 2000 BC show that the Chinese already knew and used ink to write. In the Middle Ages, the paint began to be used as well as protection of churches and other important buildings.

The first paint factories, however, only emerged with the Industrial Revolution in the second half of the 18th century. Since then, its development became the responsibility of not more painters, as hitherto, but of scientists linked to chemistry. The Twentieth Century represented a big leap for the coatings industry, with the advent of industrial origin of pigments and resins produced with synthetic polymers.

The inks add color and protect the things we already know, but how do they do it? The paint seems a thing, but it consists of binders, pigments, solvents and additives that make it able to paint different objects. Behind a simple flick on the wall there is a lot of chemistry and technology.

The pigment is the component that gives color to paint. However, for him to adhere to the wall, it is necessary the action of the ligand, which can also be called resin. Since the solvent, which can be water or oil, is responsible for diluting and transporting the pigment and binder to the tin surface to be painted, while the additives improve the properties of this set.

Here, freshly painted, but can not lay its hands because it is in the process of healing, which is the time it takes for the paint dry. When the solvent evaporates, the result is a very thin layer of pigment and binder, forming a film that covers the surface, providing color and protection to it. Ok, we have seen how the paints work.

Now let's see how they are produced. As you might imagine, the inks are not distinguished by color alone. This one, for example, is a water-based ink, ideal for walls.

It dries in contact with air from the evaporation of the solvent and as its attachment is due to a purely physical process, it is called thermoplastic. But not all the paint work the same way. The marine paints, those used in ships, are examples of thermosetting paints.

This means that in the process of drying is a chemical reaction between the functional groups involved in the polymer composition of the ligand with the functional group of a catalyst, for example. Thermosetting inks in general are two components of paint (ink + catalyst) and the resulting film of this reaction has a greater strength and durability. Although some thermosetting paints dry air, usually its drying is through the addition of heat, as happens in this automotive paint shop.

Here, the cars after they are painted in greenhouses where the temperature reaches 60 ° C. The heat is essential for the chemical reaction to take place as planned and ensures proper mounting of the ink on the surface. By ensuring greater protection, thermosetting paints are widely used by automotive and marine industries.

Ok, technological progress has allowed the production of paints more durable, beautiful and efficient. However, one can not speak in paint without touching on environmental and public health. Perhaps you've heard how older dyes, the first half of the century were rich in heavy metals and could cause various diseases.

Well, in recent decades, both industry and government alike, have focused on less aggressive inks create health and the environment. The path that is there, but still has many things that can improve. They are there to color our world, but also to protect him, to warn us of danger and even to write love letters.

How will you use them depends on your imagination. But one thing is sure, now you know how. Wise up and see you soon!