Overview
2,2-Bis(hydroxymethyl)propionic acid (BHMPA) is an organic compound with two hydroxyl groups and one carboxylic acid group, making it a versatile building block for polymer synthesis. It is widely used in industrial applications due to its ability to introduce both hydrophilicity and crosslinking sites into polymers. First synthesized in the mid-20th century, BHMPA has become a key intermediate in specialty chemicals. Its unique structure allows it to act as a chain extender or crosslinker in polyurethane and polyester systems, particularly in waterborne formulations where its hydrophilic nature improves dispersion stability.
Physical and Chemical Properties
BHMPA appears as a white crystalline powder with a melting point range of 190-195°C. Its molecular structure contains both hydroxyl (-OH) and carboxylic acid (-COOH) functional groups, enabling reactions with isocyanates, epoxides, and other common polymer precursors. The compound exhibits good thermal stability up to its melting point, after which it may decompose rather than boil. It is hygroscopic and should be protected from moisture during storage. In solution, BHMPA demonstrates amphiphilic properties, making it valuable for creating water-dispersible polymer systems.
Main Applications
The primary use of BHMPA is in the production of waterborne polyurethane dispersions (PUDs), where it serves as an internal emulsifier, eliminating the need for external surfactants. This application accounts for approximately 60% of global BHMPA consumption. In the coatings industry, BHMPA-modified resins provide improved adhesion, hardness, and chemical resistance. It is also used in adhesives, particularly for automotive and footwear applications. Emerging uses include biomedical polymers and dendrimer synthesis, where its precise functionality enables controlled molecular architectures.
Safety and Storage
BHMPA is classified as a mild irritant and should be handled with basic precautions including gloves and eye protection. The powder form may cause respiratory irritation if inhaled, requiring proper ventilation or respiratory protection during bulk handling. For long-term storage, BHMPA should be kept in tightly sealed containers with desiccants to prevent moisture absorption. The recommended storage temperature is below 30°C. Bulk quantities are typically packaged in moisture-proof bags or drums with polyethylene liners to maintain product quality.
B2B Procurement Guide
When sourcing BHMPA, buyers should specify purity requirements (typically 98% minimum) and request certificates of analysis. Pharmaceutical-grade material (≥99.5% purity) commands premium pricing but may be necessary for sensitive applications. Consider supplier capabilities for customized packaging sizes and moisture protection. Just-in-time delivery may be preferable to long-term storage for some users. Major production regions include China, Germany, and the United States, with regional price variations due to raw material costs and transportation factors.
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