Thinner is an important part of paint, and it plays a very important role in the manufacture and storage of paint, the formation of paint film and its durability. For this reason, Nanjing Kejie applies gas chromatography technology to the composition detection of paint thinner. After the paint thinner is completely evaporated, it will inevitably cause pollution to the environment and indoor air. Consumers often do not know how to choose environmentally friendly paint. Therefore, it is very valuable to analyze and determine the content of the paint thinner component, not only for enterprises Technical reference to provide useful guidance for consumers to choose true environmentally friendly green paint solvents.
1. Gas Chromatograph Detecting Diluent Instruments and Reagents
GC-5890 gas chromatograph hydrogen flame ion detector (FID),
GX-300A Nitrogen, hydrogen, and air all-in-one machine or (one for nitrogen, hydrogen, and empty cylinder)
The main components of paint thinner: benzene, toluene, methanol, isopropanol, isobutanol, n-butanol, acetone, n-butanone, methyl isobutyl ketone, cyclohexanone, ethyl acetate, ethylene glycol butyl Ether, xylene, trimethylbenzene, 120 # gasoline is the solvent for industrial production of paint and coating enterprises
Technical parameters of GC-5890F gas chromatograph
1. Temperature control
Temperature control range: 7 ℃ ~ 400 ℃ at room temperature (increment 0.1 ℃)
Cheng Sheng degree: third order
Ascent rate: 0.1 ℃ ~ 50 ℃ / min (increment 0.1 ℃)
2. Detector FID
Detection limit: ≤5 × 10-12g / s (n-hexadecane)
Baseline noise: ≤6 × 10-12A / H
Linear range: ≥105
Stabilization time: <20min
3. Detector TCD
Sensitivity: ≥10000mV? Ml / mg (n-hexadecane)
Baseline noise: ≤30uV (Carrier gas is 99.999 hydrogen)
Second, the purpose of the experiment
Gas chromatography analysis technology has the advantages of high separation efficiency, fast analysis speed and good selectivity, and has been widely used. Most of the reasons for paint thinner problems are due to formulation problems. Through gas chromatography, the composition of paint thinners is analyzed, and the composition of paint thinner formulas used for similar substrates with different properties is compared and analyzed. Provide guidance for various unfavorable problems in construction, and solve practical technical problems for enterprises. In most cases, the price of ethanol is much lower than that of butyl acetate. Adding a small amount of n-butanol to alkyd resin paint can significantly reduce the viscosity; adding a small amount of isobutanol to the paint can effectively prevent the paint film from whitening, and can also improve the fluidity and gloss. The amount of diluent added can be controlled by gas chromatography, and it can also be used to identify benzene, toluene and other benzene series solvents that are more toxic in the paint, providing useful guidance for consumers to choose true environmentally friendly green paint solvents. Water-soluble electrophoretic paint It is a kind of paint developed in the 1960s. Isopropyl alcohol, n-butanol and ethylene glycol monobutyl ether are all effective ingredients added in the solvent of water-soluble electrophoretic paint. Its content affects the use effect and economic cost of electrophoretic paint. Among them, ethylene glycol monobutyl ether is a high-boiling solvent in electrophoretic paint, used as a dispersant and wetting agent. When the gas chromatography method is used for detection, it has simple operation, accurate quantification, fast analysis speed, and accurate results can be obtained by one injection.
GREAT SEPARATING: eyelash mascar brushes are necessary and great for separating eyelashes and de-clumping mascara before or after mascara application, good to on-the-go and come in handy daily.
ELASTIC: The head for this disposable eyelash wands is elastic and can be bend slightly according to your need. Easy to use and convenient to carry, perfect for bringing along on trips, to use at weddings, proms, or performances.
HIGH QUALITY, WELL MADE: eyelash mascara brushes applicators are great quality and solid connection between brush and handle, the handle is solid and is washable for muti-uses, it's a no-hassle, stress-free way of using lash wands.
APPLICATIONS: lash mascara brush can apply castor oil on your lashes, spreading eyebrow gels or waxes to applying hair gel at the root for superior root lift on your short hairstyle, brushing over your eyebrow hairs smoothly as well.
QUANTITY AND COLOR DIVERSITY: offer different quantities and colours of these eyelash brushes. You can choose as your demand. It lasts for quite a long time whether in beauty salons or in your personal daily use.
Eyelash Mascara Brushes,Lash Mascara Brush,Lash Mascara Brushes
Shenzhen Nanfang Shishang Cosmetic Utensil Co., Ltd. , https://www.nfbrush.com