25 秒的范围中； 表干时间 ( Tack Free Time )，即从混合树脂混合物原液至泡沫外表面失去 粘着力和结合力为止的时间( 用木棒等轻轻接触泡沫表面时泡沫不粘附在木棒的时间)，
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Through the experiment, it is found that the tack free time is affected greatly by the content of catalyst, dehydrating agent, plasticizer and the free NCO.
通过实验发现催化剂、脱水剂、增塑剂以及游离的异氰酸酯含量对密封胶的表干时间有很大的影响。
The reasons of the improvement of stability and the prolongation of tack free time were analyzed and the optimal amount of dehydrating agent was studied in this article.
分析了添加脱水剂后密封胶储存稳定性提高以及表干时间延长的原因，研究了脱水剂的最优添加量。
The experiment results showed that adding dehydrating agent into the sealant obviously improved its storage stability but prolonged the tack free time of sealant and increased its flow property.
实验结果表明添加脱水剂可以显著改善密封胶的储存性能，但是使密封胶的表干时间延长，流淌性增加。
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