Different types of saturated polyester resins with different properties can be synthesized by using different polyacids and polyols. If all straight-chain diols and diacids are use
May 19, 2022
Aminoresin is a general term for resins formed by polycondensation of amino-containing compounds such as urea, melamine or benzoic melamine with formaldehyde and alcohols. Importan
The preparation method of alkyd resin is to polycondensate polyfunctional alcohol, polyacid and vegetable oil or vegetable oleic acid. Semi-drying alkyd resin.
May 18, 2022
Any paint that uses water as a solvent or as a dispersion medium can be called water-based paint. According to the type of binder in coatings, water-based coatings are divided into
Grinding wheel is the most important type of abrasive tool in grinding. The grinding wheel is a porous body made by adding a binder to the abrasive, compacting, drying and calcinin
May 16, 2022
Diamond Grinding Cup Wheel is one of the diamond tools. It is mainly suitable for surface grinding of various refractory materials. The product adopts a specially designed conical
Phosgene is an important organic intermediate. It is a very active electrophilic reagent and is easily hydrolyzed. It is a severe suffocating gas and is highly toxic. Inhalation of
May 14, 2022
Chlorophyll is the green component of tea leaves. Carotenoids are a variety of colored compounds ranging from yellow to orange-red. They are divided into two categories: carotene a
Terpenoids refer to olefinic compounds whose molecular formula is an integer multiple of isoprene. Terpenoids are a class of hydrocarbons of natural origin that are widely present
May 13, 2022
Cholesterol is a cyclopentane polyhydrophenanthrene derivative. The chemical formula is C27H46O. It is a white or light yellow crystal and is the main steroid compound in mammals a
The anomalous Zeeman effect refers to the atoms in the weak magnetic field. Because the magnetic field is weak enough, the spin-orbit coupling energy cannot be ignored; the fine st
May 12, 2022
The Zeeman effect refers to the phenomenon that atoms emit spectral lines in an external magnetic field to split and polarize; the first observation and theoretical explanation in
