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Application of defoaming agent in polyether trisiloxane low-surface-tension system

A low surface tension, trisiloxane technology, applied in the directions of liquid degassing, foam dispersion/prevention, chemical instruments and methods, etc., can solve problems such as ineffectiveness, reduce the difficulty of the operation process, and solve the effect of difficult defoaming

Active Publication Date: 2020-12-15
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyether trisiloxane wetting agent is very close to the surface tension of polydimethylsiloxane (21-22 mN / m), so it is better to choose silica-filled polydimethylsiloxane as a wetting agent. Foaming agents are ineffective against polyether trisiloxane defoamers

Method used

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  • Application of defoaming agent in polyether trisiloxane low-surface-tension system
  • Application of defoaming agent in polyether trisiloxane low-surface-tension system
  • Application of defoaming agent in polyether trisiloxane low-surface-tension system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First prepare the polysiloxane defoamer modified by acetylene glycol polyether: be raw material by acetylene glycol polyether and polysiloxane containing active hydrogen, the molar ratio is 0.1-10: 1, with isopropanol as Solvent, selects chloroplatinic acid as catalyst, and catalyst consumption is 50 ppm, at 110 o C was reacted for 3.5 h; after the reaction, the solvent and low boiling point components were evaporated to obtain polysiloxane modified with acetylene glycol polyether.

[0032] Then prepare the polyether trisiloxane low surface tension system with the above defoamer added:

[0033] (1) Mix 13.5 g of polyether trisiloxane with 1.5 g of acetylene glycol polyether modified polysiloxane, and prepare a composition with a mass ratio of 9:1; (2) Take 0.1 g of Mix the components, add water to dilute to 250 mL, and prepare a solution with a mass ratio of 9:1 and a concentration of 400 mg / L. The resulting solution is a polyether trisiloxane low surface tension syst...

Embodiment 2

[0035] The polysiloxane defoamer modified by the acetylene glycol polyether prepared in Example 1 was used.

[0036] (1) Mix 12.0 g of polyether trisiloxane with 3.0 g of acetylene glycol polyether modified polysiloxane, and prepare a composition with a mass ratio of 8:2; (2) Take 0.1 g of Mix the components, add water to dilute to 250 mL, and prepare a solution with a mass ratio of 8:2 and a concentration of 400 mg / L.

Embodiment 3

[0038] The polysiloxane defoamer modified by the acetylene glycol polyether prepared in Example 1 was used.

[0039] (1) Mix 10.5 g of polyether trisiloxane with 4.5 g of acetylene glycol polyether modified polysiloxane, and prepare a composition with a mass ratio of 7:3; (2) Take 0.1 g of Mix the components, add water to dilute to 250 mL, and prepare a solution with a mass ratio of 7:3 and a concentration of 400 mg / L.

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Abstract

The invention discloses application of a defoaming agent in a polyether trisiloxane low-surface-tension system, and belongs to the technical field of defoaming agent application. An alkynediol-polyether-modified polysiloxane defoaming agent is added into a polyether trisiloxane wetting agent, the mass ratio of the wetting agent to the defoaming agent is 9: 1-1: 9, and the foam of the polyether trisiloxane system can be controlled while the surface activity and wettability of the polyether trisiloxane system are not affected. By introducing the defoaming agent, the problem of difficult defoaming of low-surface-tension systems such as polyether trisiloxane is effectively solved, compounding of various defoaming agents is not needed in the defoaming process, and the difficulty in the operation process is reduced.

Description

technical field [0001] The invention relates to a preparation method of a low-foaming polyether trisiloxane composite wetting agent, which belongs to the technical field of defoamer applications. Background technique [0002] Polyether trisiloxane has been widely used in the fields of agricultural products, coatings, and nanomaterials because of its high surface activity and super-spreadability. However, its aqueous solution can produce relatively rich and stable foam, which greatly affects its application. Therefore, under the premise of not changing the wettability of polyether trisiloxane aqueous solution, how to reduce the foam in its system and better apply it to various fields has become a major technical problem at present. [0003] In recent years, in order to avoid the adverse effects of foam in some agricultural and industrial production, research on defoamers has gradually increased. All kinds of single and compound defoamers have been widely prepared and applie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 白艳云张咪台秀梅王国永王天壮
Owner CHINA RES INST OF DAILY CHEM IND