Diol-HCA HER is a high-performance diol chain extender developed for MDI-based polyurethane elastomer systems. It is specifically recommended for use with MDI prepolymers in the production of castable, thermoplastic, and millable polyurethane elastomers.
In polyurethane chemistry, the choice of chain extender plays a critical role in defining the final properties of the elastomer. Diol-HCA HER is engineered to provide an optimal balance between hard and soft segment structures, resulting in improved mechanical performance and processing behavior. It is particularly suitable for applications requiring both strength and flexibility.
Diol-based chain extender for controlled reactivity
Designed for MDI prepolymer systems
Provides excellent balance of hardness and flexibility
Improves tear strength and initial mechanical strength
Enhances abrasion and cutting resistance
Low shrinkage for dimensional stability
Suitable for castable, thermoplastic, and millable PU elastomers
Diol-HCA HER is widely used in:
Cast polyurethane elastomers
Thermoplastic polyurethane (TPU) systems
Millable polyurethane elastomers
Industrial rollers and wheels
Seals, gaskets, and wear-resistant components
Mechanical parts requiring durability and flexibility
As a diol chain extender, Diol-HCA HER reacts with isocyanate groups (–NCO) in MDI prepolymers to form urethane linkages. This reaction contributes to the formation of hard segments within the polyurethane matrix, improving intermolecular interactions and phase separation. The result is enhanced mechanical strength, flexibility, and resistance to wear and deformation.
Polyurethane elastomers produced with Diol-HCA HER exhibit:
Excellent plasticity and flexibility
High tear strength and initial strength
Good hardness and load-bearing capacity
Strong resistance to cutting and abrasion
Low shrinkage for improved dimensional accuracy
Used in stoichiometric balance with MDI prepolymers
Suitable for casting, extrusion, and milling processes
Processing conditions should be optimized based on formulation design
Store in a cool, dry environment. Avoid moisture contamination. Keep container tightly sealed. Follow standard industrial safety procedures.
| Chemical Component | Resorcinol -bis (β-hydroxyethyl) ether |
| CAS NO. | 102-40-9 |
| Appearance | White flake solid |
Purity | ≥ 99% |
| Hydroxyl Value | 550-560mg KOH/g |
| Initial melting point | 83-87℃ |
| Moisture Content | ≤0.1% |
| Product Structure |
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Product Feature
HER is an aromatic glycol chain extender with asymmetric molecular structure.Because the hydroxyethyl group is located at the 1, 3-position (meta-position) of benzene ring, its structural regularity is not as good as that of its isomer HQEE, its melting point is lower than HQEE, and its crystallization rate is slower than HQEE and MOCA. HER melted liquid is not easy to crystallize and solidify during temperature drop. and its lifespan in reaction kettle is longer than butanediol chain extender, which improves the operability. As a diol chain extender product, it is recommended to combine with MDI prepolymer to produce cast, thermoplastic and millable PU elastomer products. The obtained PU elastomer has a lot advantages. Such as excellent plasticity, flexibility, tear strength, initial strength, hardness, cutting resistance and low shrinkage etc.
Application Fields
HER chain-extended polyurethane elastomer can be widely used in various rollers, seals, wear-resistant liners, skateboard wheels, shoe parts, spandex, polyurethane adhesives, coatings, polyurethane flexible foam materials, etc.
