Polymer for increasing speed for spinning fine-denier filaments in Nisshinbo dry process

The invention relates to a polymer for increasing speed for spinning fine-denier filaments in a Nisshinbo dry process. The polymer comprises the following components in percentage by weight: 23%-24% of polytetramethylene ether glycol, 5.0%-6.5% of 4, 4'-diphenyl-methane-diisocyanate, 0.3%-0.6% of ethylenediamine, 0.1%-0.15% of propane diamine, 0.1%-0.15% of dibutylamine, 68%-70% of dimethylacetamide and 0.5%-0.6% of additive. The polymer for increasing the speed for spinning the fine-denier filaments in the Nisshinbo dry process effectively improves the concentration of polymer liquor under the condition that the viscosity is not changed, provides stable spinning dope for spinning spandex, and is beneficial to improvement of the spinning speed, so that purposes of increasing the production capacity and reducing the cost can be reached.