Hyperbranched polyether modified organic silicon defoaming agent with efficient foam inhibition performance and preparation method thereof

Abstract

The invention discloses a hyperbranched polyether modified organic silicon defoaming agent with efficient foam inhibition performance. The defoaming agent is prepared from, by weight, 25-40 parts of polysiloxane, 16-22 parts of hyperbranched polyether, 17-26 parts of allyl glycidyl ether, 40-60 parts of propylene epoxide, 0.2-0.5 part of double metal cyanide complex, 50-70 parts of isopropanol, 0.2-0.6 part of chloroplatinic acid catalyst, 3-6 parts of ultra-fine aluminum silicate, 1-2 parts of sorbitol, 0.8-2 parts of Tween 60, 2-4 parts of sodium carboxymethyl cellulose, a proper amount of deionized water, 2-4 parts of nonylphenol polyoxyethylene ether, 1-3 parts of triphenylmethane and 2-3 parts of polyethylene glycol. Hyperbranched polyether containing a large quantity of hydroxyl groups at the terminal serves as the raw material, allyl-terminated hyperbranched polyether is prepared, a dual-bond structure of modified hyperbranched polyether end groups and polysiloxane are subjected to a hydrosilylation reaction to synthesize hyperbranched polyether modified polysiloxane, the defoaming agent prepared from the hyperbranched polyether modified polysiloxane is excellent in shear resistance.

Description

technical field [0001] The invention relates to the field of chemical products, in particular to a hyperbranched polyether-modified organosilicon defoamer with high-efficiency foam-suppressing performance and a preparation method thereof. [0002] technical background [0003] Defoamers, also known as defoamers or defoamers, will produce many foams that affect production during industrial production, and defoamers need to be added. It is widely used to remove harmful foam produced in the production process of latex, textile sizing, food fermentation, biomedicine, paint, petrochemical, papermaking, industrial cleaning, sewage treatment and other industries. [0004] The current defoamers can be divided into two categories: silicone type and polyether type according to the composition. Due to the addition of emulsifiers and other additives, silicone defoamers are prone to defects such as demulsification and oil floating at higher temperatures; Polyether-type defoamers are most...

AI Technical Summary

Problems solved by technology

However, the polyether modified silicone oil defoamer currently studied is not ideal in terms of shear resistance, which limits its application in some fields such as coatings, petrochemicals, and papermaking.