Different types of foaming agents at various stages of development

Synthetic blowing agent overview

The synthetic foaming agent used for concrete is a highly concentrated and efficient liquid used to produce lightweight foamed concrete. Foamed concrete is also called foamed lightweight concrete (CLC).

CLC concrete has great potential in the construction of cellular lightweight applications, and the use of the correct type of foaming agent will make a huge difference in product properties (such as the mechanical properties of concrete and its resistance, etc.). Synthetic foaming agents are chemical substances that reduce the surface tension of liquids and are widely used in the manufacture of blocks, bricks, CLC concrete, etc. worldwide. Compared with other foaming agents, when high density is required, it can be formed with less energy. It is strongly recommended for use in the construction industry, as the demand for lightweight concrete continues to increase over time.

The blowing agent is usually added to the foam generator, and then the foam is blown out under high pressure. It can be used for foam concrete blocks, lightweight concrete slabs, lightweight blocks and other products.

There are many types of foaming agents used in foamed concrete, which can be summarized into four types according to their development stages: rosin soap foaming agent, synthetic foaming agent, protein foaming agent, composite foaming agent, etc.

The foaming agent of rosin soap is one of the earlier foaming agents, which mainly use rosin soap and thermal polymer as the main materials. At first, it was mainly developed and used as an aeration agent for concrete mortar, and later as a foaming agent for foamed concrete with extended functions. The production process is simple, the cost is low, the foam is plural and the foam stability is poor, and it needs to be used after heating to dissolve, which is troublesome. However, the foam has good compatibility with cement and fly ash slurry, and can react with calcium and magnesium ions to form insoluble salts, thereby increasing the stability of the foam.

Surfactants have good surface activity and are good reagents for preparing foaming agents. As an amphiphilic substance, the physical and chemical properties of surfactants depend on their molecular structure. At the same concentration, the stronger the hydrophilic effect of the polar group, the higher the solubility of the surfactant in water, and the better the foaming performance. However, due to the water content in the foam surface layer, the drainage speed is fast and the foam stability is poor. In addition, because the performance of surfactants in concrete is often very different from that in aqueous solutions, the compatibility between surfactants and cement particles is an important factor in determining the performance of foam concrete.

The foaming principle of protein foaming agents is protein degradation. Breaking of peptide bonds in protein macromolecules produces small soluble protein molecules. With the increase of small protein molecules in the solution, the hydrophobic groups gradually increase, resulting in a decrease in surface tension and the formation of an interface. In addition, due to the formation of hydrogen bonds between special groups in the molecule, strong hydrogen bonding can ensure the formation of a high-strength foam liquid film in the solution, so that the foaming agent can produce stable foam, and the natural state of complete defoaming time exceeds 24 hours. However, protein foaming agents are easily denatured by the external environment such as temperature and acidity, which is an important factor affecting the development of protein foaming agents.

In order to solve the limitations of single-component foaming agents, composite foaming agents have been researched and synthesized. Usually, it consists of two parts: foaming agent and stabilizer. Foaming agents usually choose surfactants with good foaming ability or stability; foam stabilizers are usually colloidal substances, which increase the viscosity of the foam, enhance the surface strength of the liquid film, and delay the rupture time of the liquid film to increase the stability of the foam Sex. Compound methods are mainly complementary, synergistic, synergistic and functional.

Foam quality evaluation index

Most foaming agents abroad are protein foaming agents, and their technical standards and detection methods are relatively mature. Domestic foaming agents are still in the development stage, and relevant departments have not yet issued national technical standards and regulations on foaming agents. The stability of the foam refers to the persistence of the foam, that is, the "lifetime" of the existence of the foam. On the one hand, the durability of the foam itself depends on the quality of the foaming agent. On the other hand, when the foam is mixed with the concrete slurry in the external environment, it can maintain the characteristics of non-cracking and non-collapsing, and has no adverse effect on the coagulation and hardening process of the cementitious material. It is not only related to its own characteristics, but also depends on the influence of external factors. The foaming capacity is also called the foaming ratio, which refers to the volume of the foam larger than the foaming agent solution.

Application of synthetic blowing agent

1. Foaming agent is used to make lightweight (clc) blocks and panels;

2. Blowing agent is used to fill the gap;

Foamed concrete is also very useful for filling voids. Because of its high mobility, it can even be poured into the most inaccessible places. It can be used for planned work, and can quickly provide stability and support in emergency situations;

3. Foaming A gentleman is used for roof insulation;

4. Foaming agent is used to mark CLC blocks, cast-in-place walls, bridge reinforcement wall structures, floor structures, lightweight prefabricated blocks, fire protection, sound insulation, etc.

Synthetic blowing agent price

The price of synthetic blowing agent will vary randomly with the production cost of synthetic blowing agent, transportation cost, international situation, exchange rate and market supply and demand. Tanki New Materials Co., Ltd. aims to help all industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for synthetic blowing agent, please feel free to send an email to get the latest synthetic blowing agent prices.

Synthetic blowing agent supplier

As a global synthetic blowing agent supplier, Tanki New Materials Co. Ltd has extensive experience in the performance, application and cost-effective manufacturing of advanced and engineered materials. The company has successfully developed a series of admixtures (including foam concrete additives, concrete foaming agents for lightweight concrete, CLC blocks, superplasticizers, foam concrete strength enhancers, etc.), oxides, nitrides, high purity Target materials, functional ceramics and structural devices, and provide OEM services.