Cement is really an indispensable partner in human development! Since its invention, it has been used as an important inorganic non-metallic cementitious material and is widely used in roads and bridges, water conservancy projects, construction industries, ocean engineering, etc. However, during the cementing construction process, the preparation of cement slurry often encounters the problem of air bubbles, which affects the construction effect. At this time, cement defoamer comes in handy!
Domestic defoaming agents are mainly divided into four types: emulsion type, solution type, solid type and compound type. Among them, solid defoamer can be directly added to the foaming system to eliminate and suppress foam. It is easy to use, safe to store, and has high stability. It is really an excellent choice!
Silicone defoaming agent is one of the cement defoaming agents. It has excellent defoaming performance, little environmental side effects, low dosage and low cost. Therefore, it is widely used in textile printing and dyeing, light industry, food and pharmaceutical industry and other fields. use. Dimethyl silicone oil is its main component. This silicone oil has low surface tension, low solubility in water and oil, low volatility, chemical inertness, good high and low temperature resistance, and no physiological toxicity.
When dimethyl silicone oil and silicon dioxide are mixed in a certain proportion, a milky white silicone paste can be formed. Silica plays a good role in dispersion, adsorption, thickening and anti-sedimentation here. In addition, glycerol polyoxyethylene ether not only has the effect of eliminating foam, but also has anti-foam properties, and has the advantages of low volatility, chemical inertness, environmental friendliness, high temperature and strong alkali resistance, etc. Finally, the dispersibility of dimethyl silicone in water is relatively poor. Adding an emulsifier can help it emulsify, improve the anti-foaming performance, and allow the various components of the defoamer to work synergistically.
Even if the dosage is only 0.12%, the solid defoamer can improve the compressive strength of cement stone, and the effect is far better than that of pure slurry! In oil well cement systems, it also shows obvious defoaming and foam suppression effects. After adding solid defoaming agent, the density increase rate of oil well cement is small, but the compressive strength of cement stone can be greatly improved!
