Ihe mgbakwunye ihe dị fechaa | Ndị na-ahụ maka ụfụfụ na-arụ ọrụ dị elu maka ihe nhịahụ cellular
What is the foam stability of onye na-eme ụfụfụ cellular?
Nkwụsi ike nke ụfụfụ nke onye na-ahụ maka ụfụfụ cellular na-ezo aka na arụmọrụ nke ụfụfụ ahụ nwere ike ịdị ogologo oge na-enweghị mgbawa.. Ogologo afụ ahụ dị ogologo, ka nkwụsi ike ka mma yana obere ka ọ ga-agbawa. The destruction process of foam is mainly the process of the liquid film separating the gas from thick to thin until it bursts. The main factors affecting the foam stability of cement foaming agent are as follows:
1. Bubble film thickness
If the thickness of the bubble liquid film produced by the cellular concrete foaming agent is too small, the mechanical strength is low, the resistance to external force is poor, and it is easy to rupture; the bubble liquid film is too thick, and the water between the bubbles is too high, resulting in excessive foam bleeding, and the liquid film is too thick It will speed up the discharge and easily cause the bubble to break. Ya mere, the thickness of the bubble film layer should be kept within a certain range.
2. Viscosity
The strength of the bubble liquid film produced by the cellular concrete foaming agent is a key factor in determining the stability of the foam. The strength of the liquid film depends on the firmness of the surface adsorption film. Its firmness is related to the surface viscosity. Nke dị elu viscosity elu, the formation The longer the bubble life. N'akụkụ aka nke ọzọ, the higher the viscosity of the liquid itself, the slower the liquid overflows from the liquid film, thereby enhancing foam stability.
3. Liquid surface tension
The lower liquid surface tension is good for foam formation, but it cannot guarantee foam stability. The protein foaming agent has higher liquid surface tension, although the foaming ratio is lower, but the foam produced has higher stability.
4. Surface charge
When the two surfaces of the bubble liquid film have the same kind of electric charge, they repel each other, which can prevent the liquid film from being squeezed and thinned to break.
5. Foam self-healing ability
When the foam liquid film is subjected to external force, the local thickness of the liquid film becomes thinner, which is prone to bubble breaking. When the foaming agent is adsorbed on the surface of the liquid film, it can resist surface expansion and contraction, so that the thickness of the liquid film can be restored and the strength Recovery, self-repair of surface tension.
6. The molecular structure of surfactants
The hydrophobic chain of the surfactant should be of moderate chain length to ensure that the adsorption film formed on the surface of the liquid film has a high viscosity; the hydrophilic group of the surfactant has a strong hydration capacity, which can make the foam liquid film high flow The degree of free water becomes bound water with poor fluidity, thereby increasing the viscosity of the liquid film.
5. Foam self-healing ability
When the foam liquid film is subjected to external force, the local thickness of the liquid film becomes thinner, which is prone to bubble breaking. When the foaming agent is adsorbed on the surface of the liquid film, it can resist surface expansion and contraction, so that the thickness of the liquid film can be restored and the strength Recovery, self-repair of surface tension.
6. The molecular structure of surfactants
The hydrophobic chain of the surfactant should be of moderate chain length to ensure that the adsorption film formed on the surface of the liquid film has a high viscosity; the hydrophilic group of the surfactant has a strong hydration capacity, which can make the foam liquid film high flow The degree of free water becomes bound water with poor fluidity, thereby increasing the viscosity of the liquid film.
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