What is the difference between polyether polyols and polyethers?
Polyester-type polyol is generally made of organic two-element carboxylic acid (anhydride or ester) and diol (containing diol) condensation (or ester exchange) or lactone and polyol polymerization, is one of the main raw materials of polyester-type polyurethane, so what is the difference between polyester-type polyol and polyol-type polyol?
1. Polyether polyol and polyether polyol are synthesized from different materials.
Polyester polyol obtained by condensation reaction of binary carboxylic acid and diol, 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, water, viscosity, molecular weight, density, colour, etc.
Polyether polyols (polyethers for short) are made by the polymerisation reaction of ethylene oxide, propylene oxide and epoxy butane under a catalyst. The largest yield of polyethers is produced by varying the addition of PO and EO to produce a variety of general purpose polyether polyols, using glycerol as a starting agent and epoxide.
2. Polyether polyols have different hazards to polyols.
Carbon steel . Aluminium . Stainless steel, polyethylene or polypropylene, polyester polyols are not considered hazardous for transport. Liquid polyesters are occasionally cloudy when stored for long periods at low temperatures, at around 80°C. This can be eliminated with short periods of heating and the quality is not affected. Polyester polyols tend to absorb moisture and should be stored to avoid atmospheric moisture ingress.
Neutral polyether alcohols come into contact with the mouth or with the skin. Eyes. The toxicity to mucous membranes is negligible and therefore no personal protective measures are required during use. Due to the alkaline action, amine based polyether polyols can irritate the skin and eyes, therefore safety goggles, gloves and other protective equipment should be worn during handling. When storing, protect from sunlight, rain and fire.
What are the differences and links between polyester polyols and polyether polyols?
Similarities:
The ends of the molecular chains used to react with isocyanates are all hydroxyl-valued capped.
Differences:
Polymer polyol is a vinyl monomer and initiator polymer based on a general purpose polyether polyol with acrylonitrile, styrene and other polymers. Mainly used in the soft foam sector.
Polyether polyols are mainly used in soft foams, hard foams and adhesives, mainly in polyether polyols, mainly in polyether polyols.
Polyester polyol is mainly composed of diacid and diol esterification reaction, with high hardness . Good adhesion, mainly used in hard foam . Adhesives. Elastomers, etc.
