★Product Introduction
Chain Extender MDBA Is A Trade Name Of 4,4'-Methylenebis (N-sec-butylaniline) 4,4'-Bis-S-Butylaminodiphenylmethane, Which May Also Be Called Unilink 4200, A Liquid Secondary Diamine In Which Hydrogen Atoms On Each Amino Group Are Replaced By A Sec-Butyl Group, Which Is Limited. The Combination Of Active Hydrogen Atoms And Sec-Butyl Groups In The Space Produces A Number Of Unique Properties. The Amino Moiety Forms A Urea Bond That Affects The Hard Segment, While Butyl Acts As An Internal Plasticizer. It Is Attached To The Polymer Matrix, Neither It Will Leach Out, And It Will Not Precipitate. Simultaneously, The Alkyl Group Increases The Solubility Of The Diamine So That It Can Be Mixed With Almost Any Polyol And Polyamine.

Chinese Name:4,4’-双仲丁氨基二苯基甲烷,Unilink4200,扩链剂MDBA,MDBA

4,4'-Methylenebis (N-sec-butylaniline),4,4'-Bis-Succinic Diphenylmethane Cas Number: 5285-60-9

★Advantages:
Liquid, Safe And Easy To Operate
Long Life In The Kettle
Low Toxicity - Ames Test Negative
Increased Mobility And Adhesion
Low Humidity Sensitivity
Can Be Used For The Maturation Of MDI Prepolymers
Compatible With A Variety Of Polyol Co-Curing Agents And Other Polyurethane Chemicals
Can Be Used For Room Temperature Curing
Hard Foam: Enhanced Compressive Dimensional Stability, Reduced Brittleness, High Closed Cell Rate, Low Thermal Conductivity
TDI Soft Foam: Low Density, High Strength, High Load Bearing MDI Soft Foam: Low Density, Low Hardness, Enhanced Strength

★Product Use
4,4'-Methylenebis (N-sec-butylaniline),4,4'-Bis-S-Butylaminodiphenylmethane, Unilink4200-Chain Extender MDBA Can Be Applied To Hard Foam, Soft Foam, Paint, Adhesives, Sealants, Elastomers, Typical Usage Of 1-5% Of Polyols.4 ,4'-Di-S-Butylaminodiphenylmethane-Chain Extender MDBA Can Also Be Used For Spraying Polyurea, And A Variety Of Compounds For Metal And Concrete Repair.
Soft Foam
   Bulk Foam - In Standard TDI And High Resilience Foam Combinations, The Addition Of 3-5 Php Of 4,4'-Bis-S-Butylaminodiphenylmethane-MDBA Improves The Foam'S Tensile Strength, Tear Strength, And Load Carrying Capacity. Performance, In Most Cases, These Advantages Are Achieved In Reducing The Foam Density In The Polyester Foam, The Same Ratio Of 4,4 '- Bis-S-Butylaminodiphenylmethane-MDBA Can Significantly Improve The Tear Strength And Load-Carrying Performance, And Does Not Affect The Other Properties Of The Foam.
   Cold Molded Foams - It Has Been Confirmed In Commercial Applications That The Addition Of 1-2php Of 4,4'-Biss-Butylaminodiphenylmethane-MDBA Can Reduce The Density And Soften The Foam, Thereby Optimizing The Foam Properties. It Can Also Increase Tensile Strength, Tear Strength And Elongation, And Shorten The Demolding Time.

Hard Foam
   Polyurethane Rigid Foam - Using 4,4'-Bis-S-Butylaminodiphenylmethane, Unilink 4200-Chain Extender MDBA, With 3 To 5 Php In A Water or Water-Free Rigid Foam System, Can Significantly Increase The Compressive Strength And Dimensional Stability Of The Foam, While Reduce Brittleness, Increase Closed-Cell Rate, And Reduce Thermal Conductivity.
   Polyisocyanurate Rigid Bubbles - - The Addition Of 5 Php Of 4,4'-Bis-S-Butylaminodiphenylmethane-MDBA To The System Can Increase The Compressive Strength By 100% In High Proportions Of Water-Blown or All-Water Foaming , The Dimensional Stability Is Significantly Improved.

Coatings / Adhesives / Sealants / Elastomers
   Coatings - - 4,4'-Bis-S-Butylaminodiphenylmethane, Unilink4200-Chain Extender MDBA Can Be Used For Room Temperature Curing Of TDI And MDI Coatings. With The Appropriate Catalyst Co-Curing Agent, Can Be Used For Spray Coating, Casting Compound System. The Formulation Of 4,4'-Bis-S-Butylaminodiphenylmethane-MDBA As A Curing Agent Can Improve The Adhesion And The Surface Quality.
   Adhesives - 4,4'-Bis-S-Butylaminodiphenylmethane-MDBA Allows The Base Layer To Wet Better And The Cured Polymer Adheres Better To The Coated Surface. Hard Elastomers - 4,4'-Bis-S-Butylaminodiphenylmethane, Unilink 4200-MDBA Can Be Used For The Maturation Of MDI Semi-Prepolymers To Produce A Series Of High Hardness Elastomers.
   Soft Elastomers - The Use Of 4,4'-Bis-S-Butylaminodiphenylmethane-MDBA As A Curing Agent Can Extend The Life Of The Kettle To Produce Soft Elastomers For Use As Industrial Sealants.

★ Polyurea
Reducing The Gelling Reaction Rate Makes It Possible To Produce Such High Hardness Polymers By Spray Casting Techniques. Prolonged Gelation Speed Can Improve The Adhesion With The Base Layer, Fluidity, Bonding Between The Coatings And Surface Quality. The Use Of 4,4'-Bis-S-Butylaminodiphenylmethane-MDBA As A Curing Agent Significantly Improves The Impact Resistance Of The Polymer At Low Temperatures.

★ Physical And Chemical Properties
Item Indicator Unit Detection Method
Appearance Light Brown To Dark Amber Liquid - Visual Inspection
Purity ≥96.0 %(A/A) GC
MDA Content ≤ 0.030 % (A/A) GC
Moisture ≤ 0.05 % (Mass Fraction) GB 6283 (Karl Fischer Method)
MDBA Equivalent 153 - 161 GC

★Packing Specifications
18 Kg Tinplate Barrel
200 Kg Iron Drum
Storage (Use) Precautions
Store In A Properly Sealed Container In A Cool, Well-Ventilated Place Away From Sources Of Ignition.
Avoid Eye Contact And Avoid Prolonged Skin Contact or Inhalation Of Steam. Do Not Ingest It. Prohibited Near The Storage Container
Use Welding And Cutting Equipment So As Not To Cause Steam Explosion.

★4,4'-Methylenebis (N-sec-butylaniline), Safety Precautions
Toxicity, LD 50 (Oral, Rat) 1,380 Mg/Kg
(Check Carcinogens) Ames Test : Negative
This Product Does Not Belong To The International Maritime organization’S Dangerous Goods (IMDG)