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Study on the Synthesis and Compounding of Polyether Modified Polysiloxane Defoaming Agent

Author: LuYaQing
Tutor: CaiZhenYun
School: Zhejiang University
Course: Chemical Engineering
Keywords: Polyether-modified silicone defoamer Hydrosilylation Surface tension High temperature defoaming Defoaming mechanism
CLC: TQ423.95
Type: Master's thesis
Year: 2010
Downloads: 651
Quote: 3
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Abstract


Polyether-modified silicone defoaming agent (referred to as the silyl ether defoamer) has a special structure, its application and stability properties in high temperatures, acids, alkalis, and other special occasions, compared to conventional organic silicon defoamer and polyether defoamer has obvious advantages to become the the Defoamer industry has a bright market prospects of new defoamers. This paper was prepared by the molar mass of around 5000, Si-H content of between 0.05% to 0.30% of a series of low-hydrogen silicone; within the autoclave prepared by the base-catalyzed a number average molecular weight of about 1000, the molecular structure ethylene alkoxy, propylene molar ratio of the terminal allyl polyether series between 1:1 to 1:4, so that after the endcapped and antioxidants processing of acetic anhydride and low silicone oil in the chloroplatinic acid catalyzed hydrosilylation reaction to obtain the polyether-modified silicone (referred to as silyl ethers). Si-H content, polyether visits silicone oil molecules in the conversion rate of the silicon-hydrogen peroxide content of the raw material feed, the feed ratio of polyether and silicone oil, the amount of catalyst and other factors, to explore Hydrosilylation The optimal reaction conditions. Experimental results show that: when the hydrogen content in the low-hydrogen silicone polyether peroxide content is between 0.1 ~ 0.2mol/100g (peroxide value (PV)) is less than 150 mmol / kg, the feeding of the polyether and silicone oil ratio of n (C = C): n (Si-H) = 1.2:1,80 ° C insulation reaction 2h (with Pt catalyst the amount of raw material quality 40 x 10 -4 effective mass) can be obtained when the Si-H the mean conversion rate was 92% of the silyl ether. Meanwhile, the ether to the surface tension of the aqueous solution of a certain concentration of silicon, cloud point and other properties were studied and obtained the ether having different molecular structures silicon surface tension with increase in temperature of the system to decrease the change equation, so as to select according to the actual needs of a suitable the silicon ether to provide the basis for. The article also on how to choose the right anti-foaming additives and silicon ether complex for stable and efficient silicon ether defoamer. The complex obtained silicone ether defoamer with a commercially available silicone antifoam the LD200 and polyether defoamers GPE in the 85 ° C, a pH of respectively 2.0 and 13.0 foaming liquid defoaming performance test. The results showed that under these conditions, the the silyl ether defoamer defoaming outperforms LD200 and the GPE; addition, in the aspect of the thermal stability and the centrifugal stability, silicon ether defoamers also have certain advantages. Complex with silicon ether defoamer emulsion methyl silicone defoamers do the parallel comparison defoaming experimental get two different defoaming curve, the under defoaming curve its defoaming mechanism theory analysis.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Surfactant > The application of surfactants > Eliminate foam agent
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