Hyperbranched polyether modified organosilicon defoaming agent with lasting foam inhibiting effect and preparation method thereof

Abstract

The invention discloses a hyperbranched polyether modified organosilicon defoaming agent with a lasting foam inhibiting effect, composed of the following raw materials in parts by weight: 28-45 partsof polysiloxane, 16-26partsof hyperbranched polyether, 20-28 partsof allyl glycidyl ether, 45-60 partsof epoxy propane, 0.3-0.7 partof bimetal cyanide complex, 50-70 partsof isopropanol, 0.3-0.7 partof chloro-platinic acid catalyst, 3-7 partsof superfine aluminum silicate, 1-2partsof sorbitol, 1-2 partsof tween 60, 2-4 partsof sodium cellulose glycolate, an appropriate amount of de-ionized water, 4-10 partsof white carbon black, 1-2 partsof methyl triethoxy silane, 0.5-1partof ammonium carbonate and 0.6-2 partsof potassium hydroxide. The hyperbranched polyether modified organosilicon defoaming agent takes the hyperbranched polyether containing a large quantity of hydroxyl groups at the terminals as a raw material to prepare allyl-terminated hyperbranched polyether, and a polyether terminal modified double bond structure is used to generate silicon hydrogen addition reaction with the polysiloxane to synthesize hyperbranched polyether modified polysiloxane, and the defoaming agent has excellent shear resistant performance.

Description

technical field [0001] The invention relates to the field of chemical products, in particular to a hyperbranched polyether modified organic silicon defoamer with a long-lasting antifoaming effect 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 mostly polyme...

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.