CN104529219B - Cement foam stabilizing agent, cement composition thereof and application method thereof - Google Patents

Abstract

The invention discloses a cement foam stabilizer, the structural formula of which is: Wherein R1 and R2 are alkyl groups containing 3-10 carbon atoms, and R represents a molecular skeleton. The present invention also discloses a cement composition based on a cement foam stabilizer: comprising the following components in terms of mass percentage: 35% to 50% of cement; 5-15% of polyvinyl alcohol; 4-10% of water reducing agent; 1 foam stabilizer ‑10%; sodium bicarbonate 1‑8%; oleic acid 1-5%; polystyrene powder 5‑10%; water 10‑30%. The cement stabilizer provided by the invention has a better function of stabilizing the shape and mechanical properties of the cells, while maintaining the toughness of the cells, it also enhances the strength of the cement foam material system. The cement composition provided by the invention has a small bulk density and a thermal conductivity. Small, low density, high strength and non-combustible.

Description

A kind of cement foam stabilizer and its cement composition and application method

technical field

The invention belongs to the field of building materials, and relates to a cement foaming material, in particular to a foam stabilizer containing a cycloalkane molecular skeleton and a foaming cement composition thereof, which is a lightweight, heat-insulating and heat-insulating building material.

Background technique

With the development of the construction industry and the emergence of emerging technologies, there is a new demand for new building materials, and new technologies and materials support this development. For a long time, people hope that the building materials will be lightweight and reduce the weight of the building. However, although there are many cement foam materials that can meet this requirement, it is still difficult to achieve light organic materials and high strength inorganic materials due to the limitations of the materials themselves. requirements. Moreover, organic materials have a very low ignition point, and it is difficult to overcome the defect of flammability. Especially with the improvement of fire protection rating in recent years, organic materials can no longer meet the needs of buildings. For high-performance wall insulation materials, its lightweight performance is closely related to the structure of cement. Too large cells will inevitably lead to a decrease in mechanical properties, and too small cells will lead to excessive bulk density. Therefore, Controlling the cell structure of foamed cement is very important to the performance of lightweight materials.

In the early days, rosin derivatives were used as foam stabilizers. Although it can provide appropriate viscosity at the bubble interface, form a hard film, and play a certain role in stabilizing the bubbles, its molecular structure is too large, which makes the cement hydration process stronger. Affected; in the later stage, protein foaming agent was used. Protein foaming agent is a polymer compound. Although the elasticity is good and the membrane of the bubble is strong, there are still deficiencies in maintaining the strength of the cement. Therefore, it is urgent to develop a foam stabilizer with more stable performance and a more suitable structure for the cement structure skeleton, so that the cement foam material can maintain the advantages of light weight and also have higher strength.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a cement stabilizer capable of keeping the cement foam material light in weight and higher in strength.

Another object of the present invention is to provide a cement composition based on the above cement stabilizer and an application method thereof.

Technical solution: In order to achieve the above purpose, the invention provides a cement foam stabilizer, whose structural formula is:

Wherein R1 and R2 are alkyl groups containing 3-10 carbon atoms, and R represents a carbon molecular skeleton.

Further, the R indicates that the molecular framework includes small molecules.

Further, the R indicates that the molecular skeleton includes a polymer.

The preparation method of above-mentioned cement foam stabilizer, its reaction process is as follows:

Wherein the reaction condition is: and The addition reaction was carried out at a molar ratio of 1:1,

Then, the monomer obtained from the above reaction reacts with the terminal group containing isocyanate NCO-R-NCO to obtain a substance with the following structure

Wherein the reaction conditions are: the two are subjected to dehydration reaction at a molar ratio of 1:1.

The foam cement composition based on above-mentioned cement foam stabilizer, is made up of following components by mass percentage:

The foaming cement composition of the above-mentioned cement foam stabilizer, the cement includes any one of Portland cement, phosphate cement or aluminate cement or several of them in any mass ratio.

In the foamed cement composition of the above-mentioned cement foam stabilizer, the water reducer includes an organic water reducer containing carboxyl groups.

The application method of the foamed cement composition of the above-mentioned cement foam stabilizer is to weigh the corresponding components according to their mass ratio, then stir and mix them evenly, then add them to the mold, keep them warm for 1 hour at 65°C, and then Move into steam curing for 12 hours

Beneficial effects: the innovation of the present invention is to add the foam stabilizer containing cycloalkane skeleton structure to the cement-based foam material. Since the newly synthesized foam stabilizer contains isocyanate structure inside, the hardness of the whole system will be reduced. Compared with the existing foam stabilizer, the foam stabilization time is increased to 1h. Because it contains ester bonds inside, it is also easy to combine with the resin, which improves the bonding strength of the system. In addition, the molecular skeleton rigidity and flexibility Therefore, it has an excellent effect on stabilizing the cell structure, which is reflected in the smaller appearance of the cells, and the cell diameter is about 100 microns.

Description of drawings

Figure 1 is the molecular structural formula of cement stabilizer.

Fig. 2 is the synthesis chemical reaction formula of cement stabilizer molecular monomer.

detailed description

Below in conjunction with embodiment the present invention will be further described.

As shown in Figure 1, Figure 1 is the molecular structural formula of the cement stabilizer, and Figure 2 is the synthetic chemical reaction formula of the cement stabilizer molecular monomer.

Example 1:

A kind of foam cement composition containing cycloalkane skeleton structure, it is made up of following composition, and its composition and mass percent are:

The polystyrene is a particle with a particle size of 3 microns.

Described foam stabilizer structure is:

Embodiment 1 effect is shown in Table 1.

Table 1

Example 2:

A kind of foam cement composition containing cycloalkane skeleton structure, it is made up of following composition, and its composition and mass percent are:

The polystyrene is a particle with a particle size of 6 microns.

Described foam stabilizer structure is:

Embodiment 2 effect is shown in Table 2.

Table 2

Example 3:

A kind of foam cement composition containing cycloalkane skeleton structure, it is made up of following composition, and its composition and mass percent are:

The polystyrene is a particle with a particle size of 13 microns.

Described foam stabilizer structure is:

Embodiment 3 effect is shown in Table 3.

table 3

Example 4:

A kind of foam cement composition containing cycloalkane skeleton structure, it is made up of following composition, and its composition and mass percent are:

The cement includes: a mixture of Portland cement and phosphate cement, and the mass ratio is Portland cement:phosphate cement=1:5.

The polystyrene is a particle with a particle size of 8 microns.

Described foam stabilizer structure is:

Embodiment 4 effect is shown in Table 4.

Table 4

Example 5:

A kind of foam cement composition containing cycloalkane skeleton structure, it is made up of following composition, and its composition and mass percent are:

The cement includes Portland cement, phosphate cement and aluminate cement mixed in a mass ratio of 3:1:5.

The polystyrene is a particle with a particle size of 5 microns.

Described foam stabilizer structure is:

Embodiment 5 effect is shown in Table 5.

table 5

Embodiment 6:

A kind of foam cement composition containing cycloalkane skeleton structure, it is made up of following composition, and its composition and mass percent are:

The cement includes: a mixture of Portland cement and aluminate cement at a mass ratio of 5:1.

The water reducer includes an organic water reducer containing carboxyl groups.

The polystyrene is a particle with a particle size of 0.5 microns.

Described foam stabilizer structure is:

Embodiment 6 effect is shown in Table 6.

Table 6

The above is only a preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (6)

1. a cement foam stabilizer, it is characterised in that: its structural formula is:

Wherein R₁With R₂For containing Having the alkyl of 3-10 carbon number, R represents carbon molecular skeleton.

2. the preparation method of a cement foam stabilizer according to claim 1, it is characterised in that: its course of reaction is as follows:

Wherein reaction condition is: Additive reaction is carried out by the mol ratio of 1:1,

Then, above-mentioned reaction gained monomer contains isocyanates NCO-R-NCO again and reacts to obtain and have the thing of following structure with end group Matter

Wherein reaction condition is: both carry out dehydration by the mol ratio of 1:1.

3. a foamed cement composition based on the cement foam stabilizer described in claim 1, it is characterised in that: by percent mass Ratio is composed of the following components:

4. a foamed cement composition based on the cement foam stabilizer described in claim 3, it is characterised in that: described cement bag Include: any one or any mass ratio in portland cement, phosphate cement or aluminate cement several.

5. a foamed cement composition based on the cement foam stabilizer described in claim 3, it is characterised in that: described water reducer Including the organic water reducer containing carboxylic group.

6. the application process of a foamed cement composition based on the cement foam stabilizer described in claim 3, it is characterised in that: Weighing corresponding component by its mass ratio, be then stirred for mix homogeneously, be subsequently adding in mould, at 65 DEG C, insulation 1 is little Time, then moving into steam curing 12 hours.