Manufacturer: EVONIK Evonik Degussa

Structure: 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate

 Physical parameters  

 Specifications

Evonik IPDI performance and application
    The cycloaliphatic diisocyanate VESTANAT®IPDI meets all the necessary conditions for the production of light-stable and weather-resistant polyurethanes. The selection of appropriate co-reactants (polyols) imparts a high degree of resistance to yellowing and properties typical of polyurethanes such as good mechanical and chemical resistance to the polyamide system. Additionally, IPDI has many advantages in polyurethane processing due to its inherent properties.
    Since VESTANAT®IPDI contains two different isocyanate functional groups, it exhibits selectivity in urethanization reactions, such as in the synthesis of prepolymers, resulting in good reproducibility. The desired product is selectively formed, the molecular weight distribution is narrowed, the viscosity is reduced, and the residual concentration of the starting monomer diisocyanate (IPDI) is also reduced. As a polyurethane raw material, IPDI and its polyisocyanates and prepolymers are known for their excellent miscibility with other resins, as well as good solubility with various general-purpose solvents such as ketones, esters, ethers, and aromatic hydrocarbons. Good solubility and miscibility in aliphatic hydrocarbons such as petroleum solvents are also exceptional.

     From a technical point of view, VESTANAT®IPDI is an important starting isocyanate for the production of raw materials for polyurethane coatings. It is used in various forms in various polyurethane paint systems. Other important uses are solvent-free, light-stabilized polyurethane injection molding technology (RIM) and water-based or hot-melt adhesives. In polyurethane resin technology, the preparation of waterborne polyurethane dispersions is the most important application of VESTANAT® IPDI, since low-viscosity prepolymers and final products with low co-solvent content can be obtained from this starting material. It is the hard segment component of the resin. Where excellent resistance to yellowing, low reactive diluent or co-solvent content is required, urethane acrylates (conventional or waterborne) for radiation curing based on VESTANAT® IPDI synthesis can be selected.
     VESTANAT® IPDI can be applied to moisture-curing prepolymers, another application for polyurethane resins. IPDI can provide these products with yellowing resistance, low viscosity and low residual diisocyanate monomer. Solvent-borne high molecular weight polyurethane resins based on VESTANAT® IPDI can be used in coatings requiring abrasion resistance, especially long-term flexibility and light resistance. Typical applications are synthetic leather polyurethane resins or natural leather finishes. The urethane alkyd and urethane oil obtained by urethane alkyd and urethane oil obtained by urethane urethane resin by IPDI are mainly used to fully improve the anti-yellowing property, drying performance and hardness of these resins.

      In the field of polyurethane two-component applications, VESTANAT®IPDI is used in the form of addition products with triols (such as adducts with TMP) or in the form of polyisocyanates (such as VESTANAT®T1890). . This use is mainly used in large vehicle and automotive coatings (OEM and refinish).

     VESTANAT®IPDI and its polyisocyanates can be used to prepare blocked polyisocyanates, which can be used as crosslinkers for electrostatic spray powder coatings and solvent-borne industrial paints, especially can coatings and coil coatings. IPDI-based crosslinking agent for solvent-free two-component polyurethane with good light stability and mechanical properties. These systems are mainly used in elastomeric coatings and casting resins. Hard systems can be used as industrial materials.

Activity and Catalysis
       Aliphatic and cycloaliphatic diisocyanates are less reactive than aromatics. IPDI generally requires the use of a suitable catalyst to accelerate the urethanization reaction. It is recommended to use dibutyltin dilaurate as a catalyst for urethane.
       Dibutyltin dilaurate is often used when VESTANAT®IPDI or its adducts are used as crosslinking agents for polyurethane formulations at room temperature. When complete or partial reaction of isocyanate and water (moisture) is required, a mixed catalyst of dibutyltin dilaurate and a tertiary amine such as diazadicyclooctane (DABCO) should be used. In addition to dibutyltin dilaurate, iron acetylacetonate, phenylmercury salt (COSCATR83) is an effective catalyst for solvent-free polyurethanes (elastomers and casting resins). Of course at high temperatures, resin synthesis, i.e. the production of prepolymers, is possible without a catalyst for the reaction. As the temperature increases, the difference in the two isocyanate reactivities of IPDI decreases, so the production of prepolymers is more selective when the catalyst is used at room temperature. The best selectivity can be achieved at a temperature not exceeding 50 °C and the addition of DBTDL.

storage and transportation
       VESTANAT®IPDI is supplied in non-recyclable 30kg cans and 200kg drums, also in tankers and tanks. If moisture can be excluded, IPDI can be stored for at least one year without affecting the above standard quality. Long-term storage will increase the color index.
More about this source textSource text required for additional translation information
Send feedback