Silicon dioxide modified organosilicon defoaming agent and preparation method thereof

A technology of silicone defoamer and silicon dioxide, which is applied in the direction of foam dispersion/prevention, can solve the problems of limited defoaming ability of defoamers, achieve improved compatibility, simple preparation process, and facilitate large-scale production Effect

Active Publication Date: 2019-05-24
HENAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the defoaming ability of the defoaming agent obtained by blending nano-silica and silicone oil is limited. Therefore, it is necessary to provide a defoaming agent with good defoaming effect, good durability, and adjustable defoaming efficiency.

Method used

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  • Silicon dioxide modified organosilicon defoaming agent and preparation method thereof
  • Silicon dioxide modified organosilicon defoaming agent and preparation method thereof
  • Silicon dioxide modified organosilicon defoaming agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Add 100 g DMC and 0.02 g Me 4 NOH, under the condition of stirring, first raise the temperature to 90 ºC, and then gradually raise the temperature to 110 ºC, react for 30 min (calculate the time from heating to 90 ºC, and keep the final temperature at 110 ºC), add 5 g of modified nano-SiO 2 , after continuing to react for 50 min, add 2 g of hexamethyldisilazane for capping, heat up to 130 ºC to remove unreacted catalyst, distill under reduced pressure until no fraction comes out, and cool down at room temperature to obtain the silicone defoamer.

Embodiment 2

[0039] Add 100 g DMC and 0.02 g Me 4 NOH, under the condition of stirring, first raise the temperature to 90 ºC, then gradually raise the temperature to 110 ºC, react for 20 minutes (calculate the time from heating to 90 ºC, and keep the final temperature at 110 ºC), add 5 g of modified nano-SiO 2 , after continuing to react for 50 min, add 2 g of hexamethyldisilazane for end-capping, heat up to 130 ºC to remove unreacted catalyst, distill under reduced pressure until no fraction comes out, and obtain the silicone defoamer after cooling at room temperature .

Embodiment 3

[0041] Add 100 g DMC and 0.02 g Me 4NOH, under the condition of stirring, first raise the temperature to 90 ºC, then gradually raise the temperature to 110 ºC, react for 40 min (calculate the time from heating to 90 ºC, and keep the final temperature at 110 ºC), add 5 g of modified nano-SiO 2 , after continuing to react for 50 min, add 2 g of hexamethyldisilazane for end-capping, heat up to 130 ºC to remove unreacted catalyst, distill under reduced pressure until no fraction comes out, and obtain the silicone defoamer after cooling at room temperature .

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Abstract

The invention belongs to the technical field of nano hybrid materials, and particularly relates to a silicon dioxide modified organosilicon defoaming agent and a preparation method thereof. The preparation method of the defoaming agent comprises the following steps: firstly, mixing an organosilicon raw material I with a catalyst, heating to 90-130 DEG C under a stirring condition, reacting for 20-60min, and then adding modified nano SiO2 to continuously react for 30-60min to obtain a compound A; or adding the modified nano SiO2 into the organosilicon raw material II to react for 30-60 minutesat 30-130 DEG C to obtain a compound B; adding a blocking agent into the compound A or the compound B for blocking, then removing unreacted catalyst, and carrying out reduced pressure distillation andcooling to obtain the defoaming agent. According to the preparation method, the organic silicon and the silicon hydroxyl on the surface of the SiO2 are combined by chemical action through adding thesurface-modified nano SiO2 to obtain the defoaming agent with a spatial network structure; the defoaming effect of the defoaming agent is good, the durability is good, and the defoaming efficiency canbe regulated and controlled.

Description

technical field [0001] The invention belongs to the technical field of nano-hybrid materials, and in particular relates to a silicon dioxide-modified organic silicon defoamer and a preparation method thereof. Background technique [0002] In the process of industrial production, the existence of foam often leads to a decline in product quality, seriously affects production efficiency, and even causes equipment failure. Therefore, the elimination of foam is of great significance to the development of industrial technology. Since the 1960s, the research and development of defoamers have developed rapidly. Among them, silicone defoamers stand out among many defoamers because of their low surface tension, thermodynamic stability, lipophilicity and hydrophobicity, and physiological inertness, which show excellent defoaming and antifoaming effects. Today, it is still a widely used mainstream defoamer. [0003] Usually, the base polymer of silicone defoamer is simethicone, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01D19/04
Inventor 李小红张治军刘建王焕敏牛延辰吴志申张平余
Owner HENAN UNIVERSITY
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