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THF RIM
elastomer |
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This is a typical elastomer prepared by RIM injection.
Polytetramethylene glycol give improved hydrolytic stability and
retention of tensile strength. Because of the improved hydrolytic
stability the fungus resistance of the polyether polyurethane is
also improved. Although the polyether have poorer light stability
than polyesters, the addition of UV light absorber and hindered
amine light stabilizer permits to formulated polymers with
improved light stability. The use of aliphatic diisocyanates
is required for excellent UV resistance properties. |
| RIM elastomer |
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Polytetramethylene glycol 1000 MW (CAS # 25190-06-1)
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100 |
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Polytetramethylene glycol 2000 MW (CAS # 25190-06-1)
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100 |
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1.4-butanediol (CAS # 110-63-4) |
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15 |
45 |
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MDI prepolymer (18.7 % NCO) |
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121 |
253 |
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Triethylenediamine 33 % (CAS # 280-57-9) |
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1.4 |
2.8 |
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Dibutyltin bis(dodecyl mercaptide) (CAS # 1185-81-5) |
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0.12 |
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Dibutyltin dilaurate (CAS # 77-58-7) |
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0.225 |
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Gel time, seconds |
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3.0 |
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Demold time, minutes |
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2.0 |
1.0 |
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Hardness, Shore |
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78A |
52D |
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Modulus 100 %, psi, (MPa)
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675(4.7)
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2,060(14.1)
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300 %, psi, (MPa) |
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1,150 (7.9)
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3,300 (22.8)
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Tensile Strength, psi, (MPa)
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3,450(23.8)
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3,700(25.5)
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Elongation, %
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750
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340
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Die C Tear, pli, (kNm)
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460 (81)
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660 (116)
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Last edited on:
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November 16, 2006
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Copyright®, Design, Layout and Technical Content by:
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