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| Silres SY 231 |
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Silicone Intermediate
Resins which are to be used for coil coating paints must cure quickly and give flexible films, which do not soften under normal climatic conditions. In order to minimize dirt pick-up, the resins should have a low thermoplasticity and be free from low molecular weight, unreactive siloxane components. In this respect, SILRES SY 231 is an ideal intermediate for the preparation of such silicone polyesters. The choice of polyester components is also important.
For a conventional polyester based on TMP/IPA/AA the theoretical value for equivalents of hydroxyl excess should be between 6 and 7.5 mVal OH per gram of polyester resin. |
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Appearance : clear, light straw liquid
Equivalent Weight (g/eq) : 222
Total silicone content (all alkoxy groups replaced by Si-O-Si bonds), % by weight : 89
Viscosity at 25'C, mm2/s : 100 - 150
Specific gravity at 25'C, g/ml : 1.14
Refractive index at 25'C : 1.500 - 1.505
Volatiles (5 g/1 h/150'C), % by weight : 2 |
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