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The function and characteristics of water-based polyurethane surfactant
Source:iotachem.com
PostTime:2022-11-24 09:52:02
Surfactant is an important role in chemical auxiliaries. It is widely used in textile, cleaning, machinery, petroleum and other fields. With the development of technology, the role of polymer surface activity has been valued. Table work also has applications.

In general, non-reactive polyurethane surfactants and reactive polyurethane surfactants work differently in the reaction system. Non-reactive polyurethane surfactant refers to a type of polyurethane surfactant that does not chemically bond with other components in the system when it acts on a specific system.

Non-reactive polyurethane surfactants have good emulsification and other effects, but they will remain in the final product and have some negative effects. For this reason, polymerizable reactive polyurethane surfactants, which chemically bond the surfactant to the latex particles, or polymerize the surfactant during the curing stage, have attracted attention. In addition to excellent surface activity, this surfactant can also polymerize with the monomers in the system, so that the coating film has the advantages of good corrosion resistance, chemical resistance, high hardness and high elasticity. Emulsifying properties and physical and chemical properties are very prominent.

Water-based polyurethane surfactants mainly include anionic types with carboxyl groups and sulfonate groups introduced into the polyurethane macromolecular chain, cationic types of quaternary ammonium salts, and non-ionic types such as hydroxyl and polyethylene glycol. The hydrogen bond formed between them and the electrostatic interaction between them can obtain stable water-based polyurethane surfactants[]. The raw materials for the preparation of waterborne polyurethane mainly include macromolecular polyols, polyisocyanates and chain extenders. Commonly used polyols are generally polyethers, polyester diols, and sometimes polyether triols, low-branched polyester polyols, etc. The chain extenders include small molecular dihydric or polyols or amines, among which the The key to the technology is the introduction of hydrophilic groups.



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