TMXDI1 (META) Aliphatic Isocyanate Application Areas for Technology Goal:Provide information on the performance benefits, chemistry, and processing advantages of TMXDI monomer for water-bad coating technology as it
applies to polyurethane dispersions
Opportunities:Provide an isocyanate with significant health and safety benefits
Provide a coating technology that allows for the preparation of solvent-free
waterborne polyurethane dispersions
Develop TMXDI monomer bad polyurethane coatings with a broad range
of hardness and performance properties
Aqueous Dispersions UV Curable
Adhesives Floor Coatings
Specialty Coatings Flexible Coatings
Roof Coatings Plastic Coatings
rialize
Floor Coatings
Flexible Coatings
Plastic Coatings
T wo-Component Lacquers
twiggyAdhesives Flexible Coatings
Specialty Coatings
Roof Coatings
intouchables
Floor Coatings
weather怎么读Flexible Coatings
Plastic Coatings
Sealants
RIM
Potting/Encapsulation
One Shot Moisture Cure
Castable Elastomers Roof Coatings
Adhesives Floor Coatings
Sealants Specialty Coatings
Sealants
1As ud herein, all references to TMXDI are understood to be TMXDI(META) aliphatic isocyanate
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TMXDI (META) Aliphatic Isocyanate for Dispersions Why u TMXDI monomer over other isocyanates?
• TMXDI is uniquely suited for waterborne application
• Manufacturing Advantages
– Processing ea due to low prepolymer viscosity
– Solvent free, no acetone or NMP
– Higher through-puts
• Performance Advantages
– Broad range of properties obtainable
– Flexible coatings with superior adhesion
– Exceptional toughness
– Improved aluminum flake orientation
• Improved Industrial Hygiene
– Not a pulmonary nsitizer
低语whisper
• FDA Sanction for u in food packaging adhesives under 21CFR 175.105, Non Food Contact
3
NCO
TMXDI (META)
Aliphatic Isocyanate H 3C 3
META-Tetramethylxylylene Diisocyanate
Physical Properties
Molecular Formula C 14H 16N 2O 2 Molecular Weight 244.3 NCO Content, % By Weight 34.4 Equivalent Weight 122.1 Boiling Point, °C mmHg 150(3 mmHg) Melting Point, °C -10 Vapor Pressure, mmHg @ 25°C 0.003 Flash Point, °C (Setaflash Clod Cup) 153 Autoignition Point, °C 450
Solubility Inert organic solvents
TMXDI (META) Aliphatic Isocyanate Chemistry Characteristics
better city better life
Polyurethanes Intermediates (Prepolymers) NCO Terminated Prepolymers • Aliphatic isocyanate becau the NCO is not conjugated to the aromatic ring
– Excellent light stability and exterior durability
• Steric hindrance by dimethyl groups lower reactivity and reduce hydrogen bonding – Lower reactivit
y with water
– Controlled reactivity by u of catalysts
– No lf-condensation reactions leading to branching, e.g. allophanate, biuret,
isocyanurate
– Minimal reactivity with carboxyl groups
heads up 中文– Significantly lower prepolymer viscosity
• Equal isocyanate reactivity
• Higher reaction temperatures possible for prepolymer formation
– 100°C-120°C not a problem海淀翻译公司
– Stable viscosity in abnce of water
• Almost all polyurethane-polyureas are prepared via NCO prepolymer intermediates • The possibility to tailor-make any desirable intermediate by the polyaddition reaction is an important attribute
• The are prepared by the reaction of di- or polyhydroxyl compounds with an excess of diisocyanates
– Typical molecular weight 7,000 - 12,000
• Further reaction with difunctional chain extenders gives ri to the fully reacted high molecular weight polyurethane-polyurea network
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