Organic silicon defoaming composition

A composition and silicone technology, applied in the direction of foam dispersion/prevention, can solve the problems of easy gelation of reactants, unstable storage of active substances, etc.

Active Publication Date: 2016-04-20
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of a small amount of hydrogen-containing silicone resin can greatly increase the degree of branching of the cross-linked silicone oil, and when the defoaming active is prepared by adding hydrogen-containing silicone oil dropwise, the reaction is mild and easy to control, which solves the problem of not using polydimethylsiloxane. Under the premise of solvents such as oxane, the reactant is easy to gel and the active substance is unstable in storage, and the prepared active substance has good and long-lasting antifoaming performance in high temperature and strong alkali system

Method used

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  • Organic silicon defoaming composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 50 parts into the reaction vessel, the viscosity is 50mPa.s (unless otherwise specified, the viscosity mentioned below is the kinematic viscosity value at 25°C), and the structural formula is (Me) 3 SiO (MeViSiO) 2 [(Me) 2 SiO] 50 Si(Me) 3 (It is mentioned in the text that Vi is the abbreviation of vinyl functional group) vinyl polyorganosiloxane, 25 parts of hydrogen-containing silicone resin with a hydrogen content of 0.1%, mix well and heat up to 70°C, add 0.0005 Parts (calculated as platinum) chloroplatinic acid isopropanol solution, continue to heat up to 100 ° C for 1 h; then add 400 parts dropwise to the container 3 SiO(MeHSiO) 20 [(Me) 2 SiO] 350 Si(Me) 3 Hydrogen-containing polyorganosiloxane, the dropping time is controlled to be 2h, and the reaction is continued at 100°C for 1h after the dropping is completed; 15 parts of hydrophobic precipitation silica Sipernat® D10 (sold by DegussaGmbh), 10 parts of methyl MQ silicone resin (M:Q ratio 0.4:1), s...

Embodiment 2

[0036] Add 400 parts in the reaction vessel, the viscosity is 100000mPa. 3 SiO (MeViSiO) 200 [(Me) 2 SiO] 1500 Si(Me) 3 Vinyl polyorganosiloxane, 10 parts of hydrogen-containing silicone resin with a hydrogen content of 0.01%, fully mixed and heated to 70 ° C, adding 0.05 parts (calculated as platinum) isopropanol solution of chloroplatinic acid , continue to heat up to 100°C for 0.5h; then dropwise add 50 parts of 3 SiO(MeHSiO) 2 [(Me) 2 SiO] 10 Si(Me) 3 Hydrogen-containing polyorganosiloxane, control the dropping time for 1h, and continue to react at 100°C for 1h after the dropping is completed; add 20 parts of hydrophobic precipitation silica Sipernat® D13 (sold by DegussaGmbh), 20 parts of methyl MQ silicone resin (M:Q ratio 0.8:1), stirred at 100°C for 1 hour, and cooled down to room temperature to obtain defoaming composition S2.

Embodiment 3

[0038] Add 200 parts of the viscosity is 50mPa.s, structural formula is (Me) in the reaction vessel 3 SiO (MeViSiO) 2 [(Me) 2 SiO] 50 Si(Me) 3 Vinyl polyorganosiloxane, 10 parts of hydrogen-containing silicone resin with a hydrogen content of 0.2%, fully mixed and heated to 70 ° C, adding 0.05 parts (calculated as platinum) isopropanol solution of chloroplatinic acid , continue to heat up to 100°C for 1 hour; then dropwise add 140 parts of 3 SiO(MeHSiO) 2 [(Me) 2 SiO] 55 Si(Me) 3 Hydrogen-containing polyorganosiloxane, the dropping time is controlled to be 2h, and the reaction is continued at 150°C for 1h after the dropping is completed; 75 parts of hydrophobic precipitation silica Sipernat® D17 (sold by DegussaGmbh), 75 parts of methyl MQ silicone resin (M:Q ratio 0.9:1), stirred at 150°C for 2h, cooled to room temperature to obtain defoaming composition S3.

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Abstract

The invention relates to an organic silicon defoaming composition. Vinyl polysiloxane and hydrogen-containing silicon resin are subjected to a hydrogen silicon alkylation reaction, hydrogen-containing polysiloxane is dropwise added into the system to have a reaction to form a liquidity cross-linked polymer of a space structure, and finally the polymer is mixed with silicon resin, silicon dioxide and other filler to prepare the polysiloxane defoaming composition. The degree of branching of the cross-linked silicon oil can be greatly improved by the adoption of a small amount of hydrogen-containing silicon resin; when the method of dropwise adding the hydrogen-containing silicon oil is adopted for preparing the defoaming active matter, the reaction is mild and easy to control, the problems that reactant is prone to gelling and active matter is unstable in storage on the premise of adopting no polydimethylsiloxane or other solvents are solved, and the prepared active matter has the good and lasting defoaming performance in a high-temperature strong-base system.

Description

technical field [0001] The invention relates to an organosilicon defoaming composition, which belongs to the technical field of fine chemicals. Background technique [0002] People often deal with foam in daily production and life. The existence of foam has both good sides, such as being beneficial to washing, flotation, fire extinguishing, dust removal, and making foam plastics and foam ceramics, etc., but there are also many disadvantages, such as in In industries such as papermaking, textile printing and dyeing, paint, polyvinyl chloride, ink, fermentation, and sewage treatment, foam will have adverse effects on the production process and product quality. The use of defoamers can reduce or even eliminate various problems caused by foam in industrial production. According to different defoaming active substances, defoaming agents are divided into several main types such as mineral oil type, polyether type and silicone type. Compared with other types of defoamers, silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G81/00
CPCB01D19/04C08G81/00
Inventor 朱智吴飞曹添黄伟
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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