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Defoaming agent composition and preparation method thereof

A composition and defoamer technology, applied in chemical instruments and methods, chemical/physical processes, dissolution, etc., can solve the problems of low surface tension, low surface energy, strong hydrophobicity, etc., and achieve strong defoaming effect and surface Low tension and good adaptability

Inactive Publication Date: 2007-10-17
SHENZHEN OCEAN POWER INDUSTRIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third-generation defoamer has the following advantages: low surface tension; low solubility and high activity in water and general oil; low volatility and chemical inertness; no physiological toxicity, etc., but its price is relatively non-silicon defoamer High, while common silicone defoamers have low surface energy and strong hydrophobicity, so they have poor miscibility with other organic substances, especially in aqueous systems.
At present, domestic research on the synthesis and application of polyether modified silicone defoamers is still in its infancy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 75g of polyether-modified silicone polymer with a molecular weight of 4000-8000 and add it to the stirring tank; start stirring at 70-80rpm and stir for 30 minutes; weigh 10g of Foamaster50; add it to the reaction tank under stirring until it is evenly mixed, Raise the temperature of the reactor to 60-140°C, the viscosity of the system increases, increase the stirring speed or reduce the temperature of the reactor, add 2g of fumed white carbon black and 1g of Tween-20 step by step, and then add an appropriate amount of water into the reactor, Finally, the system is milky white; start stirring at 1500-2000rpm and vigorously mix for 30 minutes; after mixing evenly, filter and discharge the material for packaging.

Embodiment 2

[0021] Weigh 40g of polyether-modified silicone polymer with a molecular weight of 8000-14000 and add it to the stirring tank; start stirring at 70-80rpm and stir for 30 minutes; weigh 55g of Foamaster309A; add it into the reaction tank under stirring until it is evenly mixed, Raise the temperature of the reactor to 60-140°C, the viscosity of the system decreases, reduce the stirring speed or increase the temperature of the reactor appropriately, and add 0.5g of fumed white carbon black, 3g of Tween-20, and 2g of Span-60 step by step , and then add an appropriate amount of water to the reaction kettle, and finally the system is milky white; start stirring at 1500-2000rpm and vigorously mix for 30 minutes; after mixing evenly, filter and discharge the material for packaging.

Embodiment 3

[0023] Weigh 55g of polyether-modified silicone polymer with a molecular weight of 14000-20000 and add it to the stirring tank; start stirring at 70-80rpm and stir for 30min; weigh 20g of Defoamer127; add it into the reaction tank under stirring until it is evenly mixed. When the temperature of the reactor rises to 60-140°C, the viscosity of the system increases. Increase the stirring speed or lower the temperature of the reactor appropriately. Add 1g of fumed white carbon black, 0.5g of thickener 638, 0.5g of Tween-20, and 1g of Tween-60, then add an appropriate amount of water to the reaction kettle, and finally the system becomes milky white; start stirring at 1500-2000rpm and vigorously mix for 30 minutes; filter and pack after mixing evenly.

[0024] Compared with the products of well-known companies at home and abroad, the performance of the defoamer composition of the present invention is better.

[0025]

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PUM

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Abstract

The invention discloses a polyether modified silicone defoaming agent combination, of which mass fraction is 40-75 of A, 10-55 of B, 0.5-2 of C and 1-5 of D, wherein A and B are the key component, C and D are the secondary component, A is polyether modified silicone defoaming agent, B is defoaming agent of other kinds, C is thickening agent, and D is emulsifying agent. The also discloses the preparation method of the defoaming agent combination. The defoaming agent combination of the invention has the character of polysiloxanes defoaming agent, of which the defoaming capability is high, and surface tension and volatility are low, and which is innocuity, nonpollution and physiologically inert. The defoaming agent combination also has the character of high temperature resistant and alkaliproof like polyethers defoaming agent, and has the advantage of long lasting defoaming agent, defoaming restrain, low incorporaticn and good adaptability. The performance and price ratio is high. It has a better effect when used in stretch thick dope.

Description

【Technical field】 [0001] The invention relates to a high-performance water-based defoamer composition for architectural coatings and a preparation method thereof, more specifically, the present invention relates to a high-performance water-based polyether modified silicone defoamer used in elastic thick coatings Compositions and methods for their preparation. 【Background technique】 [0002] The foam problem in the paint industry has many damages to production, construction and coating film quality: foam hinders the dispersion of pigments and fillers, which brings great inconvenience to production operations; due to the existence of foam, packaging needs to be divided into batches Filling can only be filled, which reduces production capacity; in addition, the existence of air bubbles often causes defects on the surface of the coating film, such as "fish eyes" (protruding air bubbles) or pits that appear after the bubbles burst. The appearance of the surface coating will be d...

Claims

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Application Information

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IPC IPC(8): B01F17/54B01F17/42C09K23/54C09K23/42
Inventor 周斌何唯平
Owner SHENZHEN OCEAN POWER INDUSTRIAL CO LTD
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