| 摘要 |
The present invention provides a method of preparing extra soft polyurethane. The method of preparing extra soft polyurethane is that: Shore OO hardness of the heated and cured mould of the extra soft polyurethane is 20 to 80, the density is 0.65 to 0.85 and tan Delta is greater than or equal to 0.3. The preparing method comprises: A) preparing step, wherein the polyhydric alcohol is added with fillers, curing catalyst, cocatalyst and dehydrant of which the density is 0.035 to 0.050, and polyhydric alcohol components of which the preparing moisture ratio is less than or equal to 550 ppm; the mixing amount of the filler is greater than and equal to 1.0 mass% based on the total mass of the polyhydric alcohol and the filler; B) mixing step, wherein, under an evenly mixing condition, the polyhydric alcohol components and isocyanate components are mixed; and C) curing step, wherein the mixture obtained in the step B) is cast into a mould to heat and cure, thereby preparing the extra soft polyurethane. |
