【摘要】 通过对酚醛树脂反应机理的探讨，提出了降低酚醛树脂溶液中游离酚的两种方法，经试验对比，选择加脲的方法。通过多次试验，找出其最佳工艺条件，使游离酚由原来的１８％降至５％、既降低了酚醛树脂的成本，又解决了游离酚含量过高的问题，并在生产酚醛空心微球时得到应用，管道内粘性物质明显减少。更多还原

【Abstract】 In discussion of the reaction mechanism of phenol-formaldhyde, two methods of reducing the content of free phenol in the products were put forward. By comparison between these two methods in the tests,one of them,the method of adding urea was adopted.Through some tests, the optimum process parameters were determined. The content of free phenol was reduced from 1 8% to 5%. The cost of phenol-formaldhyde resin is reduced and the problem of overhigh content of the free phenol in phenol-formaldhyde resin has been solved. This method has been applied in the production of the phenol-formaldhyde hollow microspheres. The viscous matter in the pipeline is considerably reduced.更多还原