Products Description
PTMEG as a high-performance polyol capable of formulating polyurethane elastomers in several positive directions, whether it's low temperature flexibility, dynamic properties, resiliency, hydrolytic stability, or abrasion resistance.
Both PTMEG and PPG polyols are polyethers, which impart good low-temperature properties and excellent hydrolytic stability to polyurethane elastomers. Both polyether classes exhibit very low Tgs in the soft segment of polyurethanes. The Tg of PTMEG polyol (Tg ~ 75°C) is lower than that of PPG polyols (~65°C). Additionally, PTMEG has a uniform linear structure, which allows it to tightly pack in a PUR soft segment and undergo stress-induced crystallization. Stress crystallization results in a significant increase in the tensile properties of TDI-PTMEG Prepolymers. PPG polyols are complex structures with pendant methyl groups that disrupt chain packing and afford non-crystallizable amorphous soft-segment structures. As a result, PPG polyols in a PUR elastomer do not "stress crystallize," a beneficial feature of the PTMEG soft-segments.
|
|
PTMEG |
PPG Polyols |
Comments |
|
Backbone Structure |
Linear Aliphatic Polyether |
Branched Aliphatic Polyether |
Linear structures enhance van der Waals intermolecular forces |
|
Crystallization Characteristics |
Crystallizable |
Does not crystallize |
Stress crystallization affords performance enhancements |
|
Hydroxyl End-Group |
100 % primary -OH end functionality |
Secondary -OH, 3-4% unsaturated chain ends |
< 100 % -OH chain ends reduce network formation, a negative |
|
MWD: MW/MN |
Moderate: 1.8-2.1 |
Narrow: 1.02-1.08 |
MWD influences properties |
|
PUR Mechanical Properties |
Excellent |
Good |
PTMEG affords high tensile, resiliency and abrasion properties |
|
Prepolymer Viscosities |
Medium |
Low |
Low viscosities facilitate handling and processing |
Specification of the TDI-PTMEG Prepolymers for cast elastomer
|
Physical Properties |
Unit |
Value |
|
NCO content |
% |
6.0±0.2 |
|
Appearance at 20℃ |
White waxy solid |
|
|
Hardener |
MOCA |
|
|
MOCA/100g prepolymer |
g |
17.7 |
|
Prepolymer/ MOCA mixing temperature |
℃ |
75/120 |
|
Viscosity at 85℃ |
mPa.s |
500 |
|
Gel time |
min |
5-8 |
|
Post cure time(100℃) |
h |
16 |
|
Hardness |
shore A |
95±2 |
|
Tensile strength |
MPa |
45 |
|
100%Modulus |
MPa |
11 |
|
300%Modulus |
MPa |
20 |
|
Elongation at break |
% |
400 |
|
Tear strength (Right-angle) |
KN/m |
105 |
|
Tear strength (Trouser) |
KN/m |
35 |
|
Rebound |
% |
40 |
|
Density (24ºC) |
g/ cm3 |
1.13 |
Processing Procedure
TDI-PTMEG Prepolymers after vacuum degasing at 75-85 ℃,the prepolymer is mixed with melted MOCA for casting and vulcanization.It is suitable for manual and mechanical operation.
Storage
Store in a cool and dry place.If you can't use it up at a time,filling with nitrogen gas and then sealing it.The storage time of original packing is 6months.
Packaging is 20KG/barrel and 200KG/barrel.
FAQ
Why choose us ?
1.Big factory with stable quality, and passed ISO standards.
2.Professional technical support and reliable after-sales service
3.Fast delivery and secure packaging, you can expect your order to arrive within 7-14 days after the deposit is received.
4.We prioritize fast communication and offer flexible business cooperation modes to accommodate your requirements.
What is the monthly/annual output?
100,000 tons/year of combined polyether
Can you send free samples?
Free sample can be offered,freight collect.
However,we will do our best to support our customers.
How do you ensure your product quality?
Under the ISO 9001, our QA team is responsible for the quality supervision and testing during the whole production process.QC team is responsible for the testing of raw materials and finished products.
And had equipped with near-infrared spectroscopy, high performance liquid instrument, gaseous phase instrument, flame photometer and other advanced testing devices.
Except above PTMEG Based Polyurethane Prepolymer for cast elastomer,our Beiqiao can supply the
TDI Poly Ether 2 component
MDI Poly Ether 2 component
TDI Poly Ester 2 component
MDI Poly Ester 2 component
MDI Poly Ester Quasi 3 component system
PTMEG both Poly Ether and Poly Ester
Customerized items also can be accepted,kindly contact us for details.
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