杨木粉制备泡沫的工艺研究

以杨木粉为原料，通过液化制成液化树脂，再对液化树脂采用中低温发泡法制备发泡材料，系统地考虑了液化树脂黏度和固体质量分数、发泡温度以及表面活性剂、固化剂、发泡剂用量和种类等因素对制备工艺的影响。结果表明：适宜的发泡条件为杨木粉液化树脂黏度为6 000 mPa·s、固体质量分数为75%，发泡温度75 ℃，以吐温-80与OP-10（质量比1∶1）复配作为表面活性剂，以正戊烷为发泡剂，1，4-丁内酯为固化剂，用量都在8%~12%，该条件下发泡过程稳定，制得的泡沫泡孔细腻，均匀，闭孔率高，表观质量好，泡沫的表观密度小（0.12~0.16 g/cm³）并且发泡倍率高（5~8倍）。

Production Process of Resinous Foam Material Made From Poplar Wood Powder

With poplar wood powder as raw material, the liquefied resin was prepared by liquefaction experiment system and then the resin was used to foam by low temperature foaming system. In addition,the effects of foaming temperature, viscosity and solid mass fraction of resin, surfactant, curing agent and foaming agent dosage and kinds on preparation process were studied. The results showed that the appropriate viscosity of resin was about 6 000 mPa/s with the solid mass fraction of 75% and the foaming temperature was set at 75 ℃, with Twain-80 and OP-10(mass ratio of 1:1) as surfactant, n-pentane as foaming agent and 1,4-butyrolactone as curing agent at the dosages of 8%-12%. Under these conditions, the foaming process was stable and the pore of foaming material was fine and even. What's more, the foaming material had high percentage of close area, good surface quality, low density(0.12-0.16 g/cm³) and high foaming ratio(5-8).