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Organosilicon defoamer Hubei Jingmen Big Picture
When preparing PAM aqueous solution, it should be carried out in enamel, galvanized, aluminum or plastic barrels. When preparing and storing in iron containers, it should be noted that the product should be slowly added to the dissolver with stirring and heating measures. , Should avoid solidification, the solution should be prepared at a suitable temperature, and long-term excessive mechanical shear should be avoided. It is recommended to stirrer-revolution/min, otherwise it will cause polymer degradation and affect the use effect. PAM aqueous solution should be used now. When the solution is placed for a long time, its performance will gradually decrease depending on the water quality. After adding a flocculant aqueous solution to the suspension, if it is stirred vigorously for a long time, it will destroy the formed floc anion. Polyacrylamide APAM product description Anionic polyacrylamide APAM has an appearance of white powder.
Hubei Jingmen organosilicon defoamer is based on this mechanism. When the added electrolyte in the solution exceeds the critical concentration of agglomeration, no more excess counter ions will enter the diffusion layer. The condition of grain re-stabilization. This mechanism is based on the simple electrostatic phenomenon to illustrate the effect of electrolyte on the destabilization of colloidal particles, but it does not consider the effect of other properties in the destabilization process (such as adsorption), so it cannot explain other complex destabilization phenomena, such as trivalent If the amount of aluminum salt and iron salt used as coagulant is too much, the coagulation effect will decrease, or even stabilize again. Another example is that the polymer or polymer organic matter with the same charge as the colloidal particles may have a good coagulation effect: the isoelectric state should It has a good coagulation effect, but the coagulation effect is often less when the ξ potential is greater than zero in production practice.
In fact, adding a coagulant to the aqueous solution to destabilize the colloidal particles involves the interaction of the colloidal particles and the coagulant, the colloidal particles and the aqueous solution, and the coagulant and the aqueous solution. It is a comprehensive phenomenon. The structure of the micellar electric double layer determines the concentration of counter ions on the surface of the colloidal particles. As the distance from the surface of the colloidal particles increases, the concentration of counter ions decreases, which will eventually be equal to the ion concentration in the solution. When the electrolyte is added to the solution to increase the ion concentration in the solution, the thickness of the diffusion layer is reduced. When two colloidal particles are close to each other, because the thickness of the diffusion layer decreases and the zeta potential decreases, their mutual repulsive force is reduced, that is, the repulsive force between the colloids with high ion concentration in the solution is smaller than that with low ion concentration. The suction force between the colloidal particles is not affected by the composition of the water phase, but due to diffusion and thinning, the distance between them when they collide is reduced, so that the mutual suction force is greater.
The big picture of organosilicon defoamer shows that the combined force of repulsion and attraction has changed from repulsive force to suction force (the repulsive potential energy disappears), and the colloidal particles can quickly agglomerate. This mechanism can better explain the sedimentation phenomenon in the harbor. When the fresh water enters the seawater, the salt increases, the ion concentration and the stability of the fresh water entrained colloidal particles decrease, so clay and other colloidal particles are easy to deposit in the harbor.
