Volatile Organic Compounds (VOC)
Chinese name：挥发性有机物

        English name: VOC ((volatile organic compounds))

        Definition.

        VOC is the abbreviation of volatile organic compounds (volatile organic compounds). According to the definition of the World Health Organization boiling point in 50 ℃ - 250 ℃ compounds, saturated vapor pressure at room temperature exceeds 133.32 Pa, at room temperature in the form of vapor in the air of a class of organic substances.

        According to their chemical structures, they can be further divided into eight categories: alkanes, aromatics, alkenes, halogenated hydrocarbons, esters, aldehydes, ketones and others. The main components of VOC are: hydrocarbons, halogenated hydrocarbons, oxyhydrocarbons and nitrogen hydrocarbons, which include: benzene series, organic chlorinated compounds, Freon series, organic ketones, amines, alcohols, ethers, esters, acids and petroleum hydrocarbon compounds.

        Sources.

        VOC outdoor mainly from fuel combustion and transportation; indoor mainly from combustion products such as coal and natural gas, smoking, heating and cooking smoke, construction and decoration materials, furniture, household appliances, cleaning agents and the human body itself emissions, etc.

        Tobacco industry: ink, organic solvents.

        Textile industry: glue used in footwear products, etc.

        Toy industry: correction fluid, scented toys, etc.

        Furniture decoration materials: paints, lacquers, adhesives, etc.

        Automobile parts materials: glues, paints, etc.

        Electronic and electrical industry: cleaning solvents that will volatilize VOC, electronic hardware, etc. when used at higher temperatures.

        Others: detergents, cleaning agents, clothing softener, cosmetics, office supplies, wallpaper and other decorative products.

        Hazards.

        Indoor VOC pollution has attracted the attention of various countries.

        The impact of volatile VOC on human health is mainly to stimulate the eyes and respiratory tract, make the skin allergic, so that people produce headaches, sore throat and weakness, which also contains many carcinogenic substances.

        The country's new home promulgated the "indoor environmental pollution control code for civil buildings", the content of indoor air TVOC, has become an important item to evaluate whether the indoor air quality of living rooms qualified. The TVOC content specified in this standard is Ⅰ class civil building project: 0.5 mg/m3, Ⅱ class civil building project: 0.6mg/m3 .

        How to control VOC content in paint formulation

        It is very easy to meet the national standard GBl8582-2001 for VOC limit, but it is very difficult to meet the environmental standard. According to the formula, it is possible to add about 12.5% to 15% of the formula content to meet the national standard, but only 3% to 3.5% to meet the environmental standard. So, why is it difficult to meet the environmental standard? It is because after reducing VOC to the limit range, it will have a greater impact on the film-forming performance and frost-proof performance of interior coating products, so the necessary methods must be taken to adapt.

        1. Ensure that the volumetric solid content of the product is appropriately increased while the volatile solvent content remains unchanged

        2. Use efficient film-forming additives, reduce the amount of solvent added

        3. Directly reduce the amount of anti-freeze agent, or use protective additives to improve the anti-freeze ability of the emulsion, reduce the amount of anti-freeze solvent added

        4. Use low temperature film-forming emulsions

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