Application of BES Sodium Salt in Synthesis of Waterborne Polyurethane Coatings
Dihydroxyethylaminoethanesulfonic acid sodium salt, referred to as BES sodium salt, has very good water solubility. When used as a buffer, the buffer range is 6.6-8.0, and its acid-base form does not form chelation with some metal ions. Most waterborne polyurethane resins do not contain reactive NCO groups, so the resin is mainly cured by the cohesion and adhesion of polar groups in the molecule. The carboxyl and hydroxyl groups in the water-based polyurethane can participate in the reaction under suitable conditions, so that the adhesive can be cross-linked. Because BES sodium salt contains a hydrophilic group, it can greatly enhance the hydrophilicity of the modified material after it is combined with the polymer material.
Dihydroxyethylaminoethanesulfonic acid sodium salt
In this paper, the synthesis and application of a sodium bisulfite-terminated polyester-type fixative vitex is introduced. In the synthesis and application of an end-capped waterborne polyurethane color-fixing agent, long carbon chain fatty acid polyester diol and polyester diol with branched chain structure are used as soft segments, which can ensure the wet rubbing fastness of the product and improve the The softness of the product after film formation. BES sodium salt is used as the hydrophilic base, and the chain extension is adopted first, and the end capping process is adopted. The emulsion has low viscosity, uniform particle size and stable storage.
Using N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate sodium (BES-Na) and dimethylolpropionic acid (DMPA) as hydrophilic chain extenders, a series of in situ polymerization was prepared. Sulfonic acid-based waterborne polyurethane (SWPU); then acrylamide (AM) was introduced into SWPU to prepare a series of BES-Na sulfonic acid-based polyurethane composite hydrogels (SWPUH) by emulsion polymerization. Fourier transform infrared spectroscopy (FTIR) The structure of SWPUH was characterized, and the effects of BES-Na content on the swelling properties, pH sensitivity, ionic strength sensitivity and mechanical properties of SWPUH hydrogels were investigated.
The results show that the swelling ratio of SWPUH6 is the largest, which is 33.12, which is 50.20% higher than the equilibrium swelling ratio of SWPUH1. The SWPUH hydrogel also has multiple sensitivities. The addition of BES-Na can improve the acid-base stability of the hydrogel.
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