Types of polyether defoamers
1、GP type defoamer
It is made by addition polymerization of propylene oxide or a mixture of ethylene oxide and propylene oxide with glycerol as the initiator
GP type defoamer has poor hydrophilicity and low solubility in the foaming medium, so it is suitable for use in thin fermentation broth. Its antifoaming ability is superior to its defoaming ability, and it is suitable for addition to the basic culture medium to inhibit the generation of foam during the entire fermentation process.
2、GPE type defoamer is also called foam enemy
Adding ethylene oxide to the end of the polypropylene glycol chain segment of the GP type defoamer, it becomes polyoxyethylene oxypropylene glycerol with a hydrophilic group at the chain end, also called. According to the addition amount of ethylene oxide of 10%, 20%,…(__)…50%, they are called GPE10, GPE20,…GPE50 respectively.
GPE type defoamer has good hydrophilicity, is easy to spread in the foaming medium, has strong defoaming ability, but has high solubility and short defoaming activity, so it is better to use it in viscous fermentation broth.
3、GPES type defoamer: There is a new type of polyether defoamer, which uses hydrophobic stearate to cap the chain ends of GPE type defoamer, thus forming a block copolymer with hydrophobic chains at both ends and a hydrophilic chain in the middle. The molecules of this structure are easy to be dispersed in a horizontal state at the gas-liquid interface, so the surface activity is strong and the defoaming efficiency is high.
