阅读说明：本技术 一种发泡水泥添加剂 (Foaming cement additive ) 是由 李桂丽 于 2020-12-14 设计创作，主要内容包括：本发明公开一种发泡水泥添加剂,属于建筑添加剂技术领域。本发明发泡水泥添加剂是由以下重量百分比的原料组成的：发泡组分20-40％、稳泡组分2-6％、增效组分0.1-0.8％、无机矿物组分0.5-1％、余量为水。本发明添加琥珀酸二仲辛酯磺酸钠和硝基苯酚作为增效组分,并添加一定量的纳米二氧化硅作为无机矿物组分,增效组分可渗入混凝土内部,在搅拌过程中发生爆裂,从而产生更多的泡沫和孔结构,而无机矿物组分在爆裂过程中均匀分散,极大程度的增加了材料的力学性能本发明中各种物质相互协同,具有发泡能力强,在掺量为1％的情况下,泡沫稳定性好,强度高、保温效果极佳。(The invention discloses a foaming cement additive, and belongs to the technical field of building additives. The foaming cement additive of the invention is composed of the following raw materials by weight percent: 20-40% of foaming component, 2-6% of foam stabilizing component, 0.1-0.8% of synergistic component, 0.5-1% of inorganic mineral component and the balance of water. According to the invention, di-sec-octyl succinate sodium sulfonate and nitrophenol are added as synergistic components, a certain amount of nano silicon dioxide is added as an inorganic mineral component, the synergistic components can permeate into the concrete and burst in the stirring process, so that more foams and pore structures are generated, the inorganic mineral component is uniformly dispersed in the bursting process, the mechanical properties of the material are greatly improved, and the foaming capacity is strong, and under the condition that the mixing amount is 1%, the foam stability is good, the strength is high, and the heat preservation effect is excellent.)

1. The foaming cement additive is characterized by comprising the following raw materials in percentage by weight: 20-40% of foaming component, 2-6% of foam stabilizing component, 0.1-0.8% of synergistic component, 0.5-1% of inorganic mineral component and the balance of water.

2. The foamed cement additive of claim 1, wherein the foaming component is hydrogen peroxide.

3. The foaming cement additive of claim 2 wherein the hydrogen peroxide is H₂O₂The content was 27.5%.

4. The foaming cement additive as claimed in claim 1, wherein the foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamidol hexaglycerol ether in a mass ratio of 1: 1.

5. The foaming cement additive of claim 1 wherein the synergistic component is comprised of di-sec-octyl succinate sodium sulfonate and nitrophenol.

6. The foaming cement additive as claimed in claim 1, wherein the synergistic component is di-sec-octyl succinate sodium sulfonate and nitrophenol in a weight ratio of 0.5-2.5: 1.

7. The foaming cement additive of claim 1 wherein the inorganic mineral component is nanosilica.

Technical Field

The invention belongs to the technical field of building additives, and particularly relates to a foaming cement additive.

Background

The foaming cement is a novel light heat-insulating material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing foam and cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine and carrying out natural maintenance. It belongs to a bubble-shaped heat-insulating material, and is characterized by that in the interior of concrete a closed foam hole is formed, so that the concrete can be lightened and its heat-insulating effect can be raised.

The foamed cement heat-insulation board is used as a light, heat-insulation, sound-insulation and non-combustible green energy-saving building material, is very suitable for an external heat-insulation and fireproof isolation strip of an external wall, is also suitable for manufacturing a sandwich core material of a light partition board, and is widely applied and produced in batches and on a large scale nationwide. The foamed cement board is prepared with cement as main material and through adding hydrogen peroxide, hard calcium, flyash, cement foaming agent, etc. and through mixing, foaming and other steps. However, when the foamed cement board is produced, the problems of large foaming bubbles and uneven foaming are easy to occur, and the problems of coarse foaming, low later strength, high water absorption and the like can occur.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a foaming cement additive which has the advantages of high bubble rate, stable foam, high strength and small using amount.

The technical scheme adopted by the invention is as follows:

a foaming cement additive is composed of the following raw materials in percentage by weight: 20-40% of foaming component, 2-6% of foam stabilizing component, 0.1-0.8% of synergistic component, 0.5-1% of inorganic mineral component and the balance of water.

Preferably, the foaming component is hydrogen peroxide.

Preferably, the hydrogen peroxide solution contains H₂O₂The content was 27.5%.

Preferably, the foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-glycerol ether according to the mass ratio of 1: 1.

Preferably, the synergistic component consists of sodium di-sec-octyl succinate sulfonate and nitrophenol.

Preferably, the synergistic component is sodium di-sec-octyl succinate sulfonate and nitrophenol which are in a weight ratio of 0.5-2.5: 1.

Preferably, the inorganic mineral component is nanosilica.

The foaming component of the invention is single hydrogen peroxide which can rapidly release oxygen under the action of alkaline oxide in cement to generate bubbles. The foam stabilizing component comprises lauryl diethanol amide and stearyl amine alcohol hexa-polyglycerol ether, wherein the lauryl diethanol amide has a stabilizing effect on bubbles, the capacity of resisting breakage of foam is increased, the foam becomes tough, so that the stability of the foam is increased, the surface tension of the foam is reduced, the foam is not easy to break, the service life of the foam is prolonged, and the phenomenon of die collapse of foamed cement is reduced. The stearamide alcohol hexa-polyglycerol ether is a nonionic surfactant, has hydrophilic groups and lipophilic groups, can be adsorbed on the surface of bubbles to form directional arrangement, increases the elasticity and flexibility of a liquid film, improves the mechanical strength of the bubble film, can play a role in resisting surface expansion and contraction, and can restore the thickness of the bubble film and realize self-repair when an external force is applied.

Meanwhile, the di-sec-octyl succinate sodium sulfonate and the nitrophenol are added as synergistic components, a certain amount of nano silicon dioxide is added as an inorganic mineral component, the synergistic components can permeate into the concrete and burst in the stirring process, so that more foams and pore structures are generated, the inorganic mineral component is uniformly dispersed in the bursting process, and the mechanical property of the material is greatly improved.

The invention has the beneficial effects that: in the invention, various substances are mutually cooperated, the foaming capacity is strong, and the porosity of the foam concrete can reach 90% under the condition that the mixing amount is 1%; good foam stability, high strength and excellent heat preservation effect.

Detailed Description

The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.

Example 1

A foaming cement additive is composed of the following raw materials in percentage by weight: 20% of foaming component, 2% of foam stabilizing component, 0.1% of synergistic component, 0.5% of inorganic mineral component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The synergistic component is composed of di-sec-octyl succinate sodium sulfonate and nitrophenol according to the weight ratio of 0.5: 1.

The inorganic mineral component is nano silicon dioxide.

Example 2

A foaming cement additive is composed of the following raw materials in percentage by weight: 30% of foaming component, 4% of foam stabilizing component, 0.5% of synergistic component, 0.8% of inorganic mineral component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The synergistic component is composed of di-sec-octyl succinate sodium sulfonate and nitrophenol according to the weight ratio of 1.5: 1.

The inorganic mineral component is nano silicon dioxide.

Example 3

A foaming cement additive is composed of the following raw materials in percentage by weight: 40% of foaming component, 6% of foam stabilizing component, 0.8% of synergistic component, 1% of inorganic mineral component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The synergistic component is composed of di-sec-octyl succinate sodium sulfonate and nitrophenol according to the weight ratio of 2.5: 1.

The inorganic mineral component is nano silicon dioxide.

Comparative example 1

A foaming cement additive is composed of the following raw materials in percentage by weight: 40% of foaming component, 6% of foam stabilizing component, 0.8% of synergistic component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The synergistic component is composed of di-sec-octyl succinate sodium sulfonate and nitrophenol according to the weight ratio of 2.5: 1.

Comparative example 2

A foaming cement additive is composed of the following raw materials in percentage by weight: 40% of foaming component, 6% of foam stabilizing component, 1% of inorganic mineral component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The inorganic mineral component is nano silicon dioxide.

Comparative example 3

A foaming cement additive is composed of the following raw materials in percentage by weight: 40% of foaming component, 6% of foam stabilizing component, 0.8% of synergistic component, 1% of inorganic mineral component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The synergistic component is di-sec-octyl succinate sodium sulfonate.

The inorganic mineral component is nano silicon dioxide.

Comparative example 4

A foaming cement additive is composed of the following raw materials in percentage by weight: 40% of foaming component, 6% of foam stabilizing component, 0.8% of synergistic component, 1% of inorganic mineral component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

The synergistic component is nitrophenol.

The inorganic mineral component is nano silicon dioxide.

Comparative example 5

A foaming cement additive is composed of the following raw materials in percentage by weight: 40% of foaming component, 6% of foam stabilizing component and the balance of water.

The foaming component is hydrogen peroxide. H in the hydrogen peroxide₂O₂The content was 27.5%.

The foam stabilizing component is prepared by mixing lauroyl diethanol amine and stearamide alcohol hexa-polyglycerol ether according to the mass ratio of 1: 1.

Performance testing

Referring to the standards of JG/T266-2011 foam concrete and GB/T5486-2008 inorganic hard heat insulation product test method, R.SAC42.5 rapid hardening sulphoaluminate cement of Fuzhonglian cement company Limited is used as a cementing material, the water-cement ratio is 0.5, the addition amount of a foaming agent is 1 percent of the total mass of the cementing material, a blank case adopts a commercially available common foaming agent, and the performance test method is as follows:

compressive strength

Firstly, curing the formed test block to the age, cutting the test block into the size of 100mm multiplied by 100mm, drying the test block, using a CMT5504 microcomputer controlled electronic universal tester, adjusting the loading speed to be (10 +/-1) mm/min according to GB/T5486 test method of inorganic hard heat insulation products, and processing the test result according to the following formula:

sigma-compressive Strength (MPa)

F-breaking load (N)

S-area under pressure (mm) of sample²)

Dry density

And (3) putting the test block into an air drying oven, drying the test block to constant weight at the temperature of 60 +/-5 ℃, namely, weighing the test block with the mass change rate within 0.2 percent within 3 hours, and weighing the test block with the mass G. The length, width and height of the steel bar are measured by a steel ruler, the volume V1 is calculated, and the dry density calculation formula is as follows:

in the formula, rho-dry density (kg/m) of the test piece³)

Coefficient of thermal conductivity

According to the method of GB/T10294, the measurement of the thermal conductivity is divided into the following five steps:

(1) pouring the foamed cement paste into a mold with the thickness of 300mm multiplied by 25mm for molding, and adopting a double-plate thermal conductivity tester for an experiment to mold two homogeneous samples.

(2) The molded test block is cut and leveled, and is kept at the temperature of 60 ℃ 5 ℃ for 24h, and then is dried at the temperature of 105 ℃ 5 ℃ to constant weight.

(3) The thickness of 8 points of two test samples is measured by a vernier caliper, the data is recorded, the average value of the data is taken as L1 and L2, and the thickness of the test block is

(4) Inputting the thickness L of the test block into a double-flat-plate heat conductivity coefficient tester, and measuring the heat conductivity coefficient of the test block at 25 ℃.

Water absorption test

The test was carried out according to JG/T266-2011 "foam concrete".

The results of the performance test are shown in Table 1

	Coefficient of thermal conductivity W/m.k	Compressive strength MPa	Water absorption%	Dry density kg/m3
					Example 1	0.082	4.2	4	412
Example 2	0.071	4.1	5	399
					Example 3	0.070	4.3	4	385
Comparative example 1	0.064	3.0	10	241
					Comparative example 2	0.063	3.3	13	239
Comparative example 3	0.063	2.9	11	233
					Comparative example 4	0.061	2.9	12	230
Comparative example 5	0.062	2.2	25	210

It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.