This first part of this paper will introduce the mechanical-dynamical properties of polysiloxane defoamer thoroughly. Defoamers or foam breakers are added to eliminate the existing foam and usually act on the outer surface of the foam because a bubble is a closed system and the defoamer can only reach the outer surfaces. Then, some of synthesis methods and compounds under real application conditions are given, such as synthesis of methyl hydrogen silicone oil, synthesis methods of polyether and compounds of polyether modified polysiloxane defoamer.

Nowadays, polyether silicone oil is widely used in many aspects of chemical industry. In this paper, the synthesis of polyether modified polysiloxane was studied and its technology was the best choice. This paper discussed the synthesis of polyether modified polysiloxane materials during the synthesis ratio, catalyst amount, reaction time and temperature on the synthesis of polyether polysiloxane low conversion rate of hydrogen silicone oil. The results showed that synthesis of polyether modified polysiloxane of the best technology: the C=C of allyl alcohol and the Si-H in low-hydrogen silicone polyether feed ratio was 1:1.2, the catalyst material is 33 μg / g, the reaction temperature is 110 °C, reaction time to 8 h.

Nowadays, the stability of the mixed solution usually is improved by adding appropriate amount of emulsifier needed in many oil products, in order to reach the better effect of solution mulsification. In this paper, using silica gel column seperation to isolate pure ingredient of the emulsifier component, and all molecular structures prepared on silica gel were characterized by Fourier transform infrared (FTIR) spectum and silid-state 1H NMR experimental observations.

The urban rain flood is a disaster, but it is also a kind of important water resources, so it is important for the urban water management work to use rain flood resource safely and effectively and turn the harm into a benefit. In this paper, the basic definition of urban rain flood was summarized, the characteristics were revealed, the mechanism was analyzed and the utilization and optimization measures of the urban rain flood were put forward, all of these provide the basic method to use the urban rain flood resources rationally.