Polyester polyol is generally formed by condensation (or transesterification) of organic binary carboxylic acid (anhydride or ester) and binary alcohol (including binary alcohol) or polymerization of lactone and polyol. It is one of the main raw materials of polyester polyurethane. What is the difference between polyester polyol and polyol?
1. The synthetic materials of polyether polyol and polyether polyol are different.
Polyester polyol prepared by polycondensation of dicarboxylic acid, glycol, etc. Due to different varieties or different preparation processes, different varieties of polyester polyols have different properties. For polyester polyols, the more important indicators are hydroxyl value, acid value, moisture, viscosity, molecular weight, density, chromaticity, etc.
Polyether polyol (polyether for short) is formed by addition polymerization of ethylene oxide, propylene oxide and butane oxide under the action of catalyst. The production of polyether is to use glycerin as initiator and epoxide as raw material to produce various general polyether polyols by changing the feeding mode of PO and EO.
2. Polyether polyols and polyols have different risks.
Carbon steel. Aluminum stainless steel, polyethylene or polypropylene, polyester polyols are all non hazardous transportation products. When liquid polyester is stored at low temperature for a long time, turbidity will occasionally occur. At about 80 ℃, this phenomenon can be eliminated after short-term heating, and the quality will not be affected. Polyester polyol is easy to absorb moisture, and moisture in the atmosphere shall be avoided during storage.
The toxicity of neutral polyether alcohol in contact with oral cavity, skin and eye mucosa is negligible, and no personal protective measures are required during use. As the amino polyether polyol has alkaline effect and will irritate the skin and eyes, safety glasses, gloves and other protective equipment should be worn during operation. Avoid sun, rain and fire during storage.
