Defoaming agent composition

Abstract

The invention relates to a defoaming agent composition which is prepared by compounding 20-30 parts by mass of branched polyether, 10-20 parts by mass of modified nano silica, 20-30 parts by mass of polyorganosiloxane and 20-30 parts by mass of a solvent. The defoaming agent composition combines the hyperbranched polyether and the modified nano silica together, has an obvious synergistic effect, so that the hyperbranched polyether and the modified nano silica can be more compatible, defoaming properties of the hyperbranched polyether and the modified nano silica in high temperature environment can be increased, when the adding amount is about 30 mug / g, the defoaming rate can reach more than 90%, and the defoaming performance is strong.

Description

technical field [0001] The invention relates to a defoamer composition and its application, in particular to a defoamer composition introduced with modified nano silicon dioxide, which belongs to the technical field of fine chemicals. Background technique [0002] Bubbles are a common phenomenon in life and work. However, in industrial production, sometimes foam can cause great harm, such as reducing the working efficiency of machines, delaying working hours, and affecting product quality. The methods of eliminating harmful foam mainly include physical methods and chemical methods, among which, the use of defoamers to defoam is one of the chemical defoaming methods. With the substantial increase in the production scale and production efficiency of industrial enterprises, the use of defoamers for defoaming has been more widely used. At present, defoamers have been widely used in papermaking, textile printing and dyeing, oil exploration and refining, coatings, emulsion polym...

AI Technical Summary

Problems solved by technology

CN1931417A discloses a high-temperature-resistant and strong-alkali-resistant defoamer composition, which is obtained by the crosslinking reaction of polysiloxane and organosilicon resin. After the active substance is prepared into an emulsion, the performance is tested by bubbling in black liquor. It has good antifoaming performance, but the defoaming speed needs to be further improved, and because the antifoaming active substance has a high viscosity, it is quite difficult to disperse it in water

[0005] It can be known from existing patent materials and commercially available defoamer information that most of the currently used silicon dioxide-containing defoamers only use the foam-breaking properties of silicon dioxide, that is, silicon dioxide is only used in its composition. It plays a physical role. Since there is no active center on the surface of pure silica, its own performance alone is far from meeting the requirements, which will cause the instability of the defoamer system, so there are low defoaming efficiency, large addition, poor durability, and use The process needs to continuously replenish defoamers and other issues