Methyl MQ Silicone Resin for Defoamer

 Industrial application

Defoaming agent for:

1. Textile printing and dyeing: textile dyes, medium temperature printing and dyeing, high-temperature printing and dyeing, scouring, printing, etc.

2. Cleaning industry: circuit board cleaning, beer bottle cleaning, steel plate cleaning, etc.

3. Paper industry: black liquor for pulp washing, papermaking, coating, etc.

4. Sewage treatment: sewage treatment, water circulation, etc.

5. Waterproof coating and electronic protective coating

Reaction principle

The residual Si-OH groups of silicone MQ resin, hydroxyl silicone oil, and residual Si oh on partially hydrophobic silica can undergo complex chain breaking, condensation and cross-linking reactions under the catalysis of strong base to form branched polymers with spatial network structure. The structure and molecular weight of silicone MQ resin are determined by the M/Q ratio. The smaller the value is, the more complex its spatial network structure is, which is more conducive to improve the foam inhibition performance of the defoamer. However, if the M/Q ratio is too small, it is difficult to dissolve in methyl silicone oil and can not be used.

Function

a. Assist methyl silicone oil in the dispersion system to make the defoaming effect of methyl silicone oil better

b. The condensation reaction of some hydroxyl groups in silicone MQ resin produces complex polymers, which is conducive to the stability of methyl silicone oil and indirectly improve the foam inhibition effect.

c. Due to its partial dispersion, it has better compatibility with methyl silicone oil, reduces the addition of silica, reduces the milky color of the system and has better fluidity.

The cause of generating foams

It is easy to generate bubbles in the progress of production and use of the coating. A large number of stable bubbles are not conductive to the smooth production of coatings and the effect and performance of coatings during application. Therefore, it’s necessary to add silicone defoamer to defoaming. 

Various additives are added to the coating formulation, such as additives to help the wetting and dispersing of pigments and fillers, additives to adjust the appearance of the paint film, and additives with special functions. Most of the above-mentioned additives are surfactants, which can change the surface tension of paint, resulting in the existence of inner factors such as blister or foam stability. All kinds of high-speed mixing equipment, such as disperser and sand mills, are used in the process of coating production. All kinds of construction methods, such as aerial spraying, airless spraying, roller coating, and blush coating, are applied to the coating process. All these production and construction processes will increase the free energy of the coating system to different extents and help generate foam, which is the external factor of generating foams.

The liquid reflux phenomenon causes the bubbles to form a stable state, counteracting the restraining effect of gravity on the bubbles, the electrostatic repulsion of surfactant can thicken the membrane of the bubbles, making it more difficult to break.

The silicone defoamer works at or after the formation of the foam thin layer: the silicone defoamer penetrates into foam elastic film and is distributed in the film, causing the thin layer to rupture through the reduction of surface tension; or foaming the monomolecular film decrease its adhesion, making it easy to break the thin layer; the hydrophobic particles in the silicone defoamer reach the surface of the thin layer and absorb surfactant at the top of the thin layer, causing the thin layer break due to the absence of surfactant.

1. Contacting with silicone defoamer→2. Molecule diffusion→3. Molecules enter into the bubble film→4. Bubble film thinning→5.Bursting

Our MQ resin is used with the silicone defoamer system of white carbon black and dimethyl silicone oil, 8%-12% resin addition ratio. On the basis of the basic silicone defoamer, MQ resin, silicone oil and silica molecules form a mote stable structure and improve the foam inhibition performance, Moreover, this stable structure improves the defoaming performance, improves acid resistance and high-temperature resistance of the silicone defoamer. While improving the defoaming performance, the interlocking structure protects the active components of the dimethylsiloxane silica system from high temperature and acid-base.

Formula suggestion：

8%-12% resin addition ratio, dimethyl silicone oil, and white carbon black as the main active defoaming ingredients. This formula improves the defoaming performance and improves the silicone defoamer's high-temperature resistance acid and alkali resistance, and improves defoaming The suitability and stability of the agent.

One of the materials of silicone defoamer acts on the dimethyl silicone oil white carbon black system to improve the defoaming performance, improve the temperature and acid resistance of the defoamer, and maintain the activity of the active ingredients.

●Improve the high-temperature resistance of silicone defoamer.

●Improve the strong alkali resistance of silicone defoamer.

●Improve the defoaming performance of silicone defoamer.

●High-performance silicone defoamer, synthetic silicone grease is recommended to add 8-12% of MQ resin, which significantly improves the antifoam performance of the silicone defoamer;

XJY-6010 /601 1/6012 can be provided in 25kg cardboard drum packaging. If you have special requirements, you can negotiate and customize them.

 Precautions

◆The pH value of this series of products is near neutral. If it accidentally comes into contact with the skin or eyes, please rinse immediately with plenty of water and go to the hospital for treatment.

◆This product has not been tested or represented as suitable for medical or pharmaceutical use.

◆This information does not include the required safe use information of the product. Please read the product instructions before use.