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摘要: 选用线型酚醛树脂为原料，采用乳化法可制得微球。为了揭示微球的成型，考察了在制备过程中酚醛树脂乙醇溶液的浓度、搅拌速率、成球终温、固化剂及表面活性剂的数量对酚醛树脂基微球的影响。研究结果表明：微球球径随着树脂溶液浓度的降低而减小，亦随搅拌速率的降低而减小；当搅拌速率为400 r/min左右，表面活性剂的浓度在0.28 mol/L～0.74 mol/L，固化剂量的质量分数为6.0 %（基于酚醛树脂）时，可得到球形度良好的微球。在高于树脂软化点以上成球终温对成球影响不大。
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关键词:
- 酚醛树脂,乳化法,制备,微球
Abstract: Phenolic resin-based microbeads were prepared from phenolic resin by an emulsion method. The influence of the concentration of phenolic resin, stirring speed, ultimate temperature, the amount of curing agent and surface active agent on the microbeads was investigated in order to reveal the formation and evolution of the spheroidal structure. Results show that a close relationship between microbead size and the concentration of phenolic resin and stirring speed is found. The optimum conditions for spheroid formation is found to be: stirring speed, 400 r/min; concentration of surface active agent, 0.28-0.74 mol/L; and amount of curing agent, 6.0 w/% (of phenolic resin). The ultimate temperature has little effect on the microbead formation beyond the softening point of the resin. -
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