The reaction between -NCO and water, dispersion of polyisocyanates in polyols, and complete diffusion among different kinds of molecules are key problems to be solved in 2k-WPU.
NCO与水的反应、多异氰酸酯难于在多元醇中的分散均匀以及组份间分子链扩散交联不充分，是研究水性双组份聚氨酯的关键问题。
Diffusion aided by hexamethyldisiloxane is used, whereby complete separation can be achieved in a few hours at room temperature.
利用六亚甲基二硅氧烷扩散分离，在室温下几小时内就能达到完全分离。
Accessories with complete expertise: PC cover including transparent, transparent stripe, diffusion, diffusion stripe, inside the clasp, outside buckle.
配件专业齐全：PC罩包括透明，透明条纹，扩散，扩散条纹，内扣，外扣。
Accessories with complete expertise: PC cover including transparent, transparent stripe, diffusion, diffusion stripe, inside the clasp, outside buckle.
配件专业齐全：PC罩包括透明，透明条纹，扩散，扩散条纹，内扣，外扣。
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