Driven by the development of green chemistry and sustainable materials, water-based polyurethane is gradually replacing traditional solvent based polyurethane due to its low VOC emissions and good film-forming properties, and is widely used in coatings, adhesives, textile finishing, leather finishing and other fields. However, the hydrophilic regulation of waterborne polyurethane is always one of the technical keys - it is necessary to ensure its good dispersibility in water while not excessively sacrificing the material's water resistance and mechanical properties. In this context, sodium dihydroxyethylaminoethanesulfonate (BES sodium salt), as a product that combines buffering function and hydrophilic properties, has gradually demonstrated unique value in the modification of waterborne polyurethane.

BES sodium salt

Basic characteristics of BES sodium salt

BES sodium salt (N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonate) is a sodium salt form of Good's buffer commonly used in biochemical experiments to maintain pH stability (buffer range 6.6-8.0). Its molecular structure contains two hydroxyethyl groups and one sodium sulfonate group, endowing it with excellent water solubility and ionic hydrophilicity. It is worth noting that the acid-base form of BES sodium salt is not easily chelated with common metal ions, thus it has good chemical stability in systems containing metal ions. These characteristics not only make it suitable for biological buffering systems, but also provide the possibility for functional modification of polymer materials.

Technical requirements and challenges of waterborne polyurethane

Waterborne polyurethane is a polyurethane colloidal system that uses water as a dispersing medium, typically achieved by introducing hydrophilic groups (such as carboxylate, sulfonate, or polyether segments) into the main or side chains of the polymer to achieve water dispersion. However, the introduction of hydrophilic groups directly affects the overall performance of the material: if the hydrophilicity is insufficient, dispersion becomes difficult and storage stability is poor; If the hydrophilicity is too strong, the water resistance will decrease after film formation. Therefore, choosing a hydrophilic chain extender that can effectively improve water dispersibility and has minimal impact on performance has become the key to optimizing the formulation of waterborne polyurethane.

The mechanism of action of BES sodium salt in waterborne polyurethane

In the synthesis process of waterborne polyurethane, BES sodium salt can participate in the reaction as an anionic hydrophilic chain extender. The sodium sulfonate group provides strong hydrophilicity, which helps the polymer self emulsify in water and form stable micelles; And two hydroxyethyl groups can undergo addition reactions with isocyanate groups, embed into the polyurethane main chain, achieve intramolecular fixation, and avoid the migration and precipitation of small molecule additives. Compared to traditional carboxylic acid based chain extenders such as dimethylolpropionic acid (DMPA), the sulfonic acid groups introduced by BES sodium salt have stronger hydrophilicity and ionic stability.

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Application prospects and practical value

Water based polyurethane materials modified with BES sodium salt exhibit excellent film-forming properties, adhesive strength, cold resistance, and biocompatibility, and have been successfully applied in fields such as synthetic leather, textile coatings, and environmentally friendly adhesives Hubei Xindesheng can provide high-purity biological buffer products, suitable for the fields of polymer synthesis and biomaterials. The product batch is stable, with good solubility, and supports customized technical services. Welcome to contact Desheng for samples and technical information.