Preparation method of terpolymer defoamer

Abstract

The invention discloses a preparation method of a terpolymer defoamer. The preparation method comprises the steps: 1) the synthesis of polyether modified silicone oil; 2) the synthesis of a terpolymer of polyol and polyether modified silicone oil; 3) the preparation of the terpolymer defoamer. Firstly, a hydrosilylation reaction is performed on an acetyl-terminated allyl polyether and a low-hydrogen containing silicone oil in the presence of a chloroplatinic acid catalyst to generate the polyether modified silicone oil having the structure of Si-C; secondly, a condensation reaction is performed on the polyether modified silicone oil having the structure of Si-C and a polyhydric alcohol in the presence of concentrated sulfuric acid to obtain the main monomer of the polyhydric alcohol-polyether modified silicone oil terpolymer system defoamer, and the monomer is taken as the major ingredient to prepare the defoamer; the problem of silicon deposition of a traditional organic silicon defoamer in the use process is improved, and the advantages of the silicone coil, the polyether and the polyhydric alcohol are integrated so that the terpolymer defoamer is integrated with the functions of defoaming, foam inhibition, foam merging and degassing, and therefore, the terpolymer defoamer can be widely applied to a plurality of fields such as papermaking, chemical fibers, oil field and wastewater, and has outstanding competitive advantages.

Description

technical field [0001] The invention relates to a preparation method of a polyol-polyether modified silicone oil ternary copolymer, belonging to the field of synthesis of defoamers for ternary copolymerization systems. Background technique [0002] At present, most of the defoamers used in papermaking, chemical fiber, oil fields and other fields are silicone defoamers. This kind of defoamer has good defoaming performance, but silicon deposition will occur after demulsification, which not only affects paper , fiber and other products, and long-term accumulation will block the pipeline, which will bring a lot of inconvenience to production. Hydrophilic allyl polyether is used to modify silicone oil through grafting reaction. The obtained product, polyether modified silicone oil, can self-emulsify in water at a certain temperature, and the formed emulsion has good stability and antifoaming properties. It is a new type of defoamer that can effectively improve the problem of sil...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the defoamers used in papermaking, chemical fiber, oil field and other fields are silicone defoamers. This kind of defoamer has good defoaming performance, but silicon deposition will occur after demulsification, which not only affects paper , fibers and other products, and long-term accumulation will block the pipeline, which will bring a lot of inconvenience to production

Hydrophilic allyl polyether is used to modify silicone oil through grafting reaction. The obtained product, polyether modified silicone oil, can self-emulsify in water at a certain temperature, and the formed emulsion has good stability and antifoaming properties. It is a new type of defoamer that can effectively improve the problem of silicon deposition; however, there are certain deficiencies in the use of polyether modified silicone oil, such as adding Adding to the foaming liquid will make the foam very fine and difficult to remove, which will affect its use effect