Polyurethane elastomers prepared using a mixture of aliphatic diol chain extenders and secondary amines
A technology for polyurethane elastomers and mixtures, applied in the field of preparing cast polyurethane elastomers, can solve the problems of high scrap rate, damage to mechanical properties, etc.
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Embodiment 1
[0076] Examples 1-5 show the effect of adding secondary amine compounds. In these examples, the amount of 1,4-butanediol was reduced relative to the comparative samples to obtain equivalent hard segment content. The difference between the individual hard segment contents was considered insignificant in this set of experiments, as was the difference in hardness. Examples 1 to 5 each had a much better surface appearance than Comparative Sample B (which was prepared using the same catalyst). Examples 2, 3 and 5 actually have surface appearances equivalent to those obtained in Example 1 using the organomercury catalyst. There was little or no adverse effect on physical properties, and in some cases (Examples 3, 4 and 5) an increase in modulus was identified.
Embodiment 6-8
[0077] Embodiment 6-8 and comparative sample C
[0078] Polyol Blends 6-8 and C were prepared from the components shown in Table 2. The polyol was the same as described in the previous examples except that it did not contain molecular sieve paste. Two elastomers were prepared from each of these masterbatches using the general method described for the previous examples. These elastomers are referred to as Examples 6-1, 6-2, 7-1, 7-2, 8-1, 8-2 and Comparative Samples C-1 and C-2, respectively. The corresponding polyol blend amounts and polyisocyanate amounts are described in Table 3. After demoulding, the elastomers were post-cured at 80°C for about 1 hour, and physical properties were measured according to ASTM D1708. The measured properties are reported in Table 4 as Examples 6-8 and Comparative Sample C.
[0079] Table 2 - Polyol Blend Compositions
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[0081] Table 3 - Elastomer formulations
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[0083] Table 4 - Elastomer Properties
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