Organic silicon defoamer containing hydroxyl polyether modified epoxidized soybean oil and preparation method thereof

Abstract

The invention discloses an organic silicon defoamer containing hydroxyl polyether modified epoxidized soybean oil. The organic silicon defoamer is prepared from the following raw materials in parts by weight: 25 to 40 parts of polysiloxane, 13 to 21 parts of hyperbranched polyether, 17 to 29 parts of allyl glycidyl ether, 45 to 62 parts of propylene epoxide, 0.2 to 0.6 part of double-metal cyanide complex, 50 to 70 parts of isopropanol, 0.2 to 0.6 part of chloroplatinic catalyst, 3 to 6 parts of superfine aluminum silicate, 1 to 2 parts of sorbitol, 1 to 2 parts of twain 60, 2 to 4 parts of sodium carboxymethyl cellulose, the appropriate amount of deionized water, 3 to 7 parts of epoxidized soybean oil, 6 to 15 parts of polyethylene glycol and 0.2 to 0.5 part of concentrated sulfuric acid. According to the organic silicon defoamer, the hyperbranched polyether containing a lot of hydroxyl at the tail end is utilized as a raw material to prepare allyl terminated hyperbranched polyether, a double-bond structure of a modified hyperbranched polyether terminal group is utilized to generate hydrosilylation reaction with the polysiloxane to synthesize hyperbranched polyether modified polysiloxane which is used for preparing the defoamer, and the defoamer has excellent shear resistance.

Description

Technical field [0001] The invention relates to the field of chemicals, in particular to an organosilicon defoamer containing hydroxyl polyether modified epoxy soybean oil and a preparation method thereof. [0002] technical background [0003] Antifoaming agent, also known as defoaming agent or defoaming agent, will produce many foams that affect production in the process of industrial production, and defoaming agent needs to be added. It is widely used to remove harmful foam produced in the production process of latex, textile sizing, food fermentation, biomedicine, coating, 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 their composition. Due to the addition of emulsifiers and other additives, silicone defoamers are prone to defects such as demulsification and oil bleaching at higher temperatures; Polyether defoamers are mostly ...

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.