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Now the mainstream coatings on the market are mainly solvent-based and water-based two, and water-based coatings are still in a period of development and rise, the dominant market or solvent-based coatings. Solvent-based coatings add a variety of organic solvents, to understand and master the performance of these organic solvents, for the correct use of coatings can play a very good auxiliary role. Zhisheng Weihua specialty coatings expert Maogong gives you a brief introduction to the common sense of organic solvents, hoping to help you better use and master paint performance.
solvent is a large group of organic compounds widely used in life and production, the molecular weight is not large, at room temperature is liquid. Organic solvents include a variety of substances, such as chain alkanes, olefins, alcohols, aldehydes, amines, esters, ethers, ketones, aromatic hydrocarbons, phenolics, halogenated hydrocarbons, heterocyclics, nitrogen-containing compounds and sulfur-containing compounds, etc. It is found in coatings, adhesives, paints and detergents and is usually used in antiseptic coatings.
more types of organic solvents, according to its chemical structure can be divided into
10
categories: (1) aromatic hydrocarbons: benzene, toluene, xylene, etc.; alkanes, octane, etc.; (3) lipocyclic hydrocarbons: cyclohexane, cyclohexone, toluene, etc.; (4) halogenated hydrocarbons: chlorobenzene, dichlorobenzene, dichloromethane, etc.; (5) alcohols: Methylene Alcohol, ethanol, isopropyl alcohol, etc.; (6) ethers: ether, epoxy propane, etc.; (7) esters: methyl acetate, ethyl acetate, propyl acetate, etc.; (8) Ketones: acetone, methyl Butyl ketones, methyl isosterone, etc.; (9) glycol derivatives: glycol monoethylene ether, ethylene glycol monoethyl ether, ethylene glycol monoclothyl ether, etc.; (10) Other: acetylene, pyridine, phenol, etc.
Organic solvents have fat-soluble, so in addition to the respiratory tract and digestive tract into the body, can also be rapidly absorbed by the complete skin, organic solvents absorbed into the human body, will act on lipid-rich nerves, blood systems, as well as liver and kidneys and other essential organs, while the skin and mucous membranes also have a certain degree of irritation. The main target organs and the strength of the action of different organic solvents are also different, which is determined by the chemical structure, solubility, contact concentration and time of each organic solvent, as well as the sensitivity of the body.
order of commonly used solvents: water (maximum polarity
>
methylamide
>
acetylene
>
methanol
>
ethanol
>
propylene alcohol
>
acetone
>
dioxy hexacyclic
>
terehydrofuran
>
methylene ethyl ethyl
>
orthanol
>
Ethyl acetate
>
ethyl ether
>
isopropyl ether
>
dechloromethane
>
chloroform
>
brominated ethane
>
BROP
>
chloropropane
>
toluene
>
carbon tetrachloride
>
carbon dioxide
>
cyclohexane >
is
>
kerosene
>
(minimal polarity).
。