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Application of a defoamer in polyether trisiloxane low surface tension system

A low surface tension, trisiloxane technology, applied in the direction of liquid degassing, foam dispersion/prevention, separation methods, etc., can solve problems such as ineffectiveness, and achieve the effect of reducing the difficulty of the operation process

Active Publication Date: 2022-05-20
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 a defoamer in polyether trisiloxane low surface tension system
  • Application of a defoamer in polyether trisiloxane low surface tension system
  • Application of a defoamer 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: from acetylene glycol polyether and polysiloxane containing active hydrogen as raw materials, the molar ratio is 0.1-10: 1, and isopropanol is used as the raw material. Solvent, select chloroplatinic acid as catalyst, the catalyst dosage is 50ppm, at 110 o C was reacted for 3.5 h; after the reaction, the solvent and low boiling point components were evaporated to obtain acetylene glycol polyether-modified polysiloxane.

[0032] The polyether trisiloxane low surface tension system with the addition of the above defoamer was then formulated:

[0033] (1) Mix 13.5 g of polyether trisiloxane and 1.5 g of acetylenic glycol polyether-modified polysiloxane evenly to 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 final solution obtained is a pol...

Embodiment 2

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

[0036] (1) Mix 12.0 g of polyether trisiloxane and 3.0 g of acetylene glycol polyether-modified polysiloxane evenly to 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 acetylene glycol polyether modified polysiloxane defoamer prepared in Example 1 was used.

[0039] (1) Mix 10.5 g of polyether trisiloxane and 4.5 g of acetylene glycol polyether-modified polysiloxane evenly to 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 the application of a defoamer in a polyether trisiloxane low surface tension system, and belongs to the technical field of defoamer application. Add acetylene glycol polyether modified polysiloxane defoamer to polyether trisiloxane wetting agent, the mass ratio of wetting agent to defoamer is 9:1 to 1:9, and it can be used without While affecting the surface activity and wettability of the polyether trisiloxane system, it can also control its foam. The introduction of the defoaming agent used in the present invention effectively solves the problem of difficult defoaming of low surface tension systems such as polyether trisiloxane, and the defoaming process does not require the compounding of various defoaming agents, reducing the operating process Difficulties.

Description

technical field [0001] The invention relates to a preparation method of a low-foam polyether trisiloxane composite wetting agent, and belongs to the technical field of defoamer application. Background technique [0002] Polyether trisiloxane has been widely used in agricultural products, coatings, preparation of nanomaterials and other fields because of its high surface activity and super spreadability. But its aqueous solution can produce rich and stable foam, which greatly affects its application. Therefore, how to reduce the foam in the system without changing the wettability of the polyether trisiloxane aqueous solution 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, the research on defoamer has gradually increased. Various single and compound defoamers are widely prepared and used, but most of them are researche...

Claims

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Application Information

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Patent Type & Authority Patents(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