|关键词||聚醚接枝聚硅氧烷 缩合反应 复配 消泡剂|
In this thesis, aiming at the huge demand for high performance additives in rapid development of industry, we choose defoaming agent which is one of the important assistant as the breakthrough and study on polyether modified polysiloxane as deformer. Polyether-modified silicone defoamer is synthesised by condensation in the introduction of polysiloxane segments grafted polyether groups, so that which has the advantages of both organosilicon defoamer and polyether defoamer. Polyether modified polysiloxane not only has the effect of low surface tension, volatile, non-toxic, non-polluting physiologically inert characteristics, but also has the advantages such as high temperature resistance and alkali properties. The research on polyether modified polysiloxane as defomer is hotspot in recent years. In this thesis, choosing polyether and silicone oil as raw material, we modified polysiloxane segments with polyether groups by condensation reaction, then blent it with silicon ointment, other active substances, emulsifier and water, finally the deformer with great antifoaming performance and good stability was produced. Firstly, polyether modified polysiloxane was synthesized by condensation. In the first place, a series of polyether modified polysiloxane was synthesized by different kinds of polyether. And the formula was determined by adjusting the molecular weight of polyether and the amount of hydrogen in the hydrogen-containing silicone oil. Secondly, the ratio of raw materials, the type of catalyst dosage, the reaction time, the reaction temperature and solvent influence on the synthesis of polyether modified polysiloxane were disicussed, and obtained a reasonable experimental conditions: the weight of polyhydrosiloxanes and polyoxyalkylene is 15 to 1, the dosage of activator is 0.4%, reacting under 100℃for 10h without solvent. Secondly, The effect of silicon ointment, emulsifier and acceding amount of water on the defoamer performance was investigated. The synthesis were optimized as follows: polyether modified polysiloxane to silicon ointment ratio 5:5, polyether modified polysiloxane to water ratio 1:2~3 and the mass percentage of the emulsifier was 4~6% with HLB value of 8.5~9.5. Thirdly, the structuer of polyether modified polysiloxane deformer was characterized by FTIR and its defoaming performance was tested according to (GB/T)26527-2011. The results showed that our homemade polyether modified polysiloxane defoamer had great defoaming performance and could satisfy the industrial technical requirements.
|罗倩. 聚醚改性有机硅消泡剂的合成及性能研究[D]. 北京. 中国科学院大学,2014.|
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