What is a cement foaming agent?
Cement foaming agent, also known as foamed concrete foaming agent, refers to an additive that can reduce the surface tension of liquid and produce a large number of uniform and stable foams to produce foamed concrete. Foaming agent is a substance that can make its aqueous solution produce a lot of foam under the condition of introducing mechanical force into the air. This substance is a surfactant or surfactant. The essence of foaming agent is its surface activity. Without surface activity, it can't be foamed, and it can't be a foaming agent. Surface activity is the core of foaming.
Which cement foaming agent is better?
1. Plant cement foaming agent: The plant cement foaming agent is made of imported high-quality natural plant polymer materials, which is made through a series of complex chemical reactions. The product is light yellow, pure and transparent oily liquid. Not sensitive to hard water, non-toxic, tasteless, no sediment. The PH value is close to neutral, which is non-corrosive to cement and metal and does not pollute the environment.
Advantages: The foaming agent is resistant to storage, difficult to deteriorate, excellent in foaming performance, rich in foam and moderate in foam stability. Foamed cement made of this foaming agent has the characteristics of low consumption, low cost and stable quality. A barrel of foaming agent (200kg) can produce about 500 cubic meters of foamed cement, so it is widely used in floor heating engineering and roof insulation engineering, which can significantly reduce the construction cost.
Disadvantages: Foamed cement made of this foaming agent has good air permeability and poor impermeability, so it can't be used in water seepage prevention projects. Compared with foamed cement made of animal foaming agent with the same density, its thermal insulation performance and compressive strength are slightly worse, so its application in some projects with special requirements is limited. Due to the limitation of foam stability of plant foaming agent, the thickness of foamed cement poured at one time is generally less than 200 mm, otherwise surface collapse will easily occur.
2. Animal cement foaming agent: Animal cement foaming agent is made from selected animal (cattle and sheep) keratin as the main raw material through a series of hydrolysis reactions such as heating, dissolution, dilution, filtration and high temperature shrinkage. It is produced by foaming machine and manufacturing technology, and strict quality control is implemented in the production process. The product is a dark brown viscous liquid with low impurity content, light pungent smell, uniform quality and good quality consistency. It has good foaming performance and excellent foam stability, and belongs to a new generation of animal cement foaming agent.
Advantages: under the same density, compared with foamed cement made of plant foaming agent, it has better sealing and heat preservation performance and high strength. Because of its excellent foam stability, the thickness of foam cement poured at one time can reach 1.5 meters without collapse, and it is suitable for producing foam bricks, light boards and light walls.
Disadvantages: due to the complicated production process, the product cost is high. The foaming performance of this foaming agent is not as good as that of plant foaming agent, and the consumption of foamed cement is high. It has a certain irritating smell and can only disappear after being made into foamed cement.
How to use cement foaming agent?
Usage of cement foaming agent 1: The original solution of cement foaming agent must be combined with water by cement foaming machine or mechanical stirring to produce rich foam, so the correct usage of cement foaming agent is to dilute the cement foaming agent according to an appropriate dilution multiple before foaming. There are three reasons: the concentration of cement foaming agent is generally large, which is directly used in foaming machine, resulting in low foam output and waste of foaming agent; Directly adding foam machine will generally produce high-quality and high-concentration foam; The liquid inlet pump of cement foaming machine is easy to be blocked. Therefore, pre-dilution must be carried out according to a reasonable dilution ratio.
How to use cement foaming agent 2: The dilution multiple of cement foaming agent has the greatest relationship with foaming effect. If the dilution factor is too high or too low, there must be an appropriate dilution factor. When the dilution ratio of water is too low and the concentration of foaming agent diluent is too high, the overall foam output decreases and the consumption of foaming agent increases. When the dilution ratio is too high, foam formation is more, liquid formation is less, foam conversion rate of foaming agent diluent is low, foam output is reduced, and foam stability is reduced. Therefore, foam with high foam content and high stability can only be obtained when the dilution ratio is appropriate.
This is how to use the cement foaming agent brought by Bian Xiao. The whole content of the use method of cement foaming agent.