Paint is a mixture of insoluble materials present in an oily liquid medium or an aqueous emulsion, where the liquid medium consists of a number of organic and inorganic materials by exposure to air and through polymerization, oxidation or drying reactions, gives a viscous layer that adheres firmly to the painted surface as it has Many types and specifications that we will present now through our specialized trading and contracting website.
Types of paints
Paints are classified into two main categories:
Suspended oil paints: The liquid medium contains unsaturated oil in some bonds and is used to paint all surfaces.
Emulsion water-based paints: The liquid medium of the emulsion consists of water and we cannot use it on metal or plastic surfaces due to the high surface tension factor of water.
paint installation
The paint consists of:
- A- Membrane components:
These substances play the role of a binder as well as a carrier medium for the rest of the paint components and can be natural or artificial. - Natural film ingredients: include some natural resins such as madagascar gum, congo gum, mastic gum, natural gum including casein, and dehydrated vegetable oils such as linseed oil, soybean oil, coconut oil, and castor oil.
- These oils must meet some of the following characteristics in order to be suitable for paint production.
- Synthetic membranes components: They include synthetic gum, tar, acrylic gum, puritan, alkyd gum, chlorinated rubber, and cellulose derivatives (cellulose esters and ethers).
- b- Viscosity reducers:
They are solvents prepared from hydrogen or ketone charcoal added to paints to reduce their viscosity and thus facilitate the preparation and application processes. Since they evaporate at the end of the process, they must achieve a number of properties:
Relatively low boiling point and high vapor pressure, provided they are not volatile, so as not to leave an uneven layer or non-volatile oil deposit.
It is ineffective against other coating components and does not adversely affect the stability of the suspension.
Inexpensive, easy to use, low in toxicity and acceptable odor.
The most common solvents are turpentine (diluent), heavy oil (oil), and some organic solvents such as xylol, carbon tetrachloride, methylene chloride, dichlorobenzene and lower grades, ethers and acetone.
As for emulsified water-based paints, water itself is used as a dispersing medium and a viscosity reducer.
C- Dehydration Accelerators:
It is a group of materials that accelerate polymerization or oxidation reactions and accelerate the drying process after application and the formation of films that carry colors. The most important of these materials are some salts of cobalt, manganese, lead and some salts.
Resins, linseed oil and some pentaerythritol compounds Since pentaerythritol condenses with carboxylic acid groups in the oil to link four chains each, each of the mentioned materials has a specific mechanism of action, and the other strengthens the bonding of the polymeric oil network, while oxidation dehydration accelerators are oxygen carriers. dissolved in oil and add up to 2% of the oil's weight.
D- Plasticizers:
Some special oils play an important role in increasing the ductility of the films after drying, which is very important for some products that require a flexible coating, such as some children's toys that can be subjected to stress and twisting processes.
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