An ultralight organic-inorganic composite thermal insulation material and a preparation method thereof

Abstract

The application discloses a kind of super-light organic-inorganic composite thermal insulation material and preparation method thereof.The super-light organic-inorganic composite thermal insulation material of the application, by pressure foaming-pressure relief foaming process, mainly by the following components by weight parts are prepared: sulphate cement 42-55 parts, fly ash 12-16 parts, silica ash 7-11 parts, glue powder 0.2-0.5 parts, compound foaming agent 4.3-5.1 parts, compound foam stabilizer 0.3-0.5 parts, water reducing agent 0.15-0.25 parts, water 21-36 parts.The application is prepared by pressure foaming-pressure relief foaming process, under pressure conditions, a large number of stable and uniform bubbles are introduced into organic-inorganic composite material, then a large number of uniform and stable pressure bubbles are mixed uniformly with cement slurry to obtain foamed slurry, in the process of pressure relief, the bubbles in the pressure foaming slurry expand uniformly, realizing super-light design, wherein the bulk density of the prepared super-light organic-inorganic composite thermal insulation material can reach 100-150kg / m 3 , and the thermal conductivity is less than or equal to 0.065 W / (m·K).

Description

Technical Field

[0001] This invention relates to the field of building insulation materials technology, specifically to an ultralight organic-inorganic composite insulation material and its preparation method. Background Technology

[0002] With the implementation of national energy conservation and emission reduction policies, building energy efficiency has gradually attracted widespread attention. Therefore, improving the level of building energy efficiency and reducing building operating energy consumption are urgent issues to be addressed.

[0003] Thermal insulation materials are a crucial material basis for achieving building energy conservation. Traditional building wall insulation materials can be classified into organic and inorganic insulation materials based on their composition. Organic insulation materials, represented by expanded polystyrene and polyurethane, typically have a density of 25-35 kg / m³. 3 With a thermal conductivity of 0.025-0.042 W / m·K, it boasts advantages such as good insulation performance, low price, and convenient construction, making it widely used in building energy conservation. However, it is flammable, posing a fire hazard and making it difficult to meet Class A fire protection requirements. Inorganic insulation materials, represented by cement-based insulation materials, while meeting Class A fire protection requirements, generally have a density greater than 300 kg / m³. 3 The thermal conductivity of these materials is typically between 0.08 and 0.22 W / m·K, which cannot meet my country's building energy conservation requirements. Therefore, developing new thermal insulation materials that balance ultra-low thermal conductivity with Class A fire safety, thereby meeting building energy conservation needs while improving building fire safety, is of great significance. Summary of the Invention

[0004] In view of this, the present invention aims to provide an ultra-lightweight organic-inorganic composite thermal insulation material, which is made from sulfoaluminate cement, fly ash, silica fume, adhesive powder, and water as the main raw materials, and is produced by a pressing and depressurizing foaming process under the action of water-reducing agent, compound foaming agent and compound foam stabilizer. This effectively solves the problem that existing inorganic materials are fireproof but have insufficient thermal insulation performance, and organic materials have excellent thermal insulation performance but are not fireproof.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] An ultralight organic-inorganic composite thermal insulation material, by weight, is mainly composed of the following components obtained through a pressurized foaming-depressurized foaming process: 42-55 parts of sulfoaluminate cement, 12-16 parts of fly ash, 7-11 parts of silica fume, 0.2-0.5 parts of adhesive powder, 4.3-5.1 parts of compounded foaming agent, 0.3-0.5 parts of compounded foam stabilizer, 0.15-0.25 parts of water-reducing agent, and 21-36 parts of water.

[0007] Optionally, the compound foaming agent is a mixture of sodium dodecyl sulfate, animal protein and water, wherein the mass ratio of sodium dodecyl sulfate, animal protein and water is (0.7-1.2):(0.1-0.5):(78-83).

[0008] Optionally, the compound foam stabilizer is a mixture of polyacrylamide, sodium carboxymethyl cellulose and dodecyl alcohol, wherein the mass ratio of polyacrylamide, sodium carboxymethyl cellulose and dodecyl alcohol is (0.8-1.4):(2.1-2.7):(3.6-4.5).

[0009] Optionally, the water-reducing agent is a polycarboxylate water-reducing agent with a solid content of 30%-40% and a water reduction rate of 30%.

[0010] A second objective of this invention is to provide a method for preparing the above-mentioned ultralight organic-inorganic composite thermal insulation material, the method comprising the following steps:

[0011] 1) Pour the sulfoaluminate cement, the fly ash, the silica fume, the adhesive powder, the water-reducing agent, and water accounting for 90% of the total water volume into pressure tank A, and stir under pressure to obtain cement paste;

[0012] 2) Dissolve the compound foaming agent and the compound foam stabilizer in water accounting for 10% of the total water volume, and then place them in pressure tank B with the same pressure as pressure tank A and stir to obtain pre-made foam;

[0013] 3) Add the pre-made foam from pressure tank B to the cement slurry from pressure tank A and mix. Keep the pressure of pressure tank A constant during the mixing process. After the mixture is evenly mixed, open the pressure relief valve of pressure tank A to allow the mixed slurry to expand under normal pressure, thereby obtaining an ultra-lightweight organic-inorganic composite thermal insulation material.

[0014] Optionally, the pressure of the pressure tank A in step 1) is 0.3-0.8 MPa, and the stirring time of the pressure stirring is 100-150s.

[0015] Optionally, the stirring speed in step 2) is 400-600 rpm / min and the stirring time is 30-60 s.

[0016] Preparation mechanism of the present invention:

[0017] This invention prepares organic-inorganic composite thermal insulation materials through a pressurized foaming-depressurization foaming process. Under pressurized conditions, a large number of stable and uniform air bubbles are introduced into the organic-inorganic composite material. Then, a large number of uniform and stable pressurized air bubbles are mixed evenly with cement slurry to obtain a foamed slurry. During the depressurization process, the air bubbles inside the pressurized foamed slurry expand uniformly, achieving an ultra-lightweight design.

[0018] Compared with existing technologies, the ultralight organic-inorganic composite thermal insulation material of the present invention has the following advantages:

[0019] 1. The pressurized foaming-depressurization foaming process provided by this invention introduces air bubbles into organic-inorganic composite materials, stabilizes the bubbles, controls their uniformity, and utilizes the uniform expansion of the gas inside the bubbles during the depressurization process to achieve an ultra-lightweight design. The resulting ultra-lightweight organic-inorganic composite insulation material can achieve a bulk density of 100-150 kg / m³. 3 Thermal conductivity ≤0.065 W / (m·K).

[0020] 2. This invention uses a pressurized foaming-depressurization foaming process to produce a foamed slurry in which the internal gas expands uniformly after depressurization. This achieves consistency between the solidification and hardening of organic-inorganic composite thermal insulation materials and the formation of pore structures, and solves problems such as insufficient gas generation or pore structure defects in the foaming process for preparing organic-inorganic composite thermal insulation materials. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions and effects of the present invention, several embodiments will be provided below. Obviously, the following description is only an embodiment and does not limit the scope of protection of the present invention.

[0022] Table 1 shows the proportions and performance parameters of each component in the ultra-lightweight organic-inorganic composite thermal insulation materials of Examples 1-6 of this invention. The water-reducing agent is a polycarboxylate water-reducing agent with a solid content of 35% and a water reduction rate of 30%. The fly ash has a median particle size of 11.8 μm and a specific surface area of ​​450 m². 2 / kg; Specific surface area of ​​silica fume is 21000 m² 2 / kg, with an activity index of 110%; the rubber powder is a redispersible latex powder produced by Wacker Chemie AG of Germany, model 8031H.

[0023] Table 1 Material Proportioning Design (parts by weight)

[0024]

[0025] The ultralight organic-inorganic composite thermal insulation materials of Examples 1-6 were prepared using the following method, specifically including the following steps:

[0026] 1) Weigh each raw material according to the material ratio in Table 1, controlling the error to be accurate to ±0.01 g;

[0027] 2) Pour sulfoaluminate cement, fly ash, silica fume, adhesive powder, water-reducing agent and water accounting for 90% of the total water volume into pressure tank A, stir under pressure to obtain cement paste. The pressure applied is shown in Table 1, and the stirring time is 120s.

[0028] 3) Dissolve the compound foaming agent and compound foam stabilizer in water accounting for 10% of the total water volume, and then place them in pressure tank B with the same pressure as pressure tank A and stir to obtain pre-made foam. The stirring speed is 500 rpm / min and the stirring time is 60 s.

[0029] 4) Add the pre-made foam from pressure tank B to the cement slurry in pressure tank A and mix. Keep the pressure of pressure tank A constant during the mixing process. After the mixture is evenly mixed, open the pressure relief valve of pressure tank A to allow the mixed slurry to expand under normal pressure, thus obtaining an ultra-lightweight organic-inorganic composite thermal insulation material.

[0030] The properties of the ultralight organic-inorganic composite thermal insulation materials of Examples 1-6 of this invention are shown in Table 2.

[0031] Table 2 Implementation Performance Evaluation

[0032]

[0033] As can be seen from the performance evaluation data in Table 2, the bulk density of the ultralight organic-inorganic composite thermal insulation material prepared in the embodiments of the present invention can reach 103-146 kg / m³. 3 The strength is ≥60 kPa, and the thermal conductivity can reach 0.053-0.065 W / (m·k). Moreover, as the pressure applied inside the pressure tank increases, the density and thermal conductivity of the ultralight organic-inorganic composite thermal insulation material prepared in this embodiment of the invention both decrease. Specifically, compared with Example 6, the density of Example 1 is reduced by 29.5%, and the thermal conductivity is reduced by 18.5%.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight organic-inorganic composite thermal insulation material, characterized in that, By weight, it is mainly composed of the following components obtained through a pressure-decompression foaming process: 42-55 parts of sulfoaluminate cement, 12-16 parts of fly ash, 7-11 parts of silica fume, 0.2-0.5 parts of adhesive powder, 4.3-5.1 parts of compound foaming agent, 0.3-0.5 parts of compound foam stabilizer, 0.15-0.25 parts of water-reducing agent, and 21-36 parts of water; The compound foaming agent is a mixture of sodium dodecyl sulfate, animal protein and water, wherein the mass ratio of sodium dodecyl sulfate, animal protein and water is (0.7-1.2):(0.1-0.5):(78-83); The compound foam stabilizer is a mixture of polyacrylamide, sodium carboxymethyl cellulose and dodecyl alcohol, with a mass ratio of (0.8-1.4):(2.1-2.7):(3.6-4.5). The ultralight organic-inorganic composite thermal insulation material is prepared by the following method: 1) Pour the sulfoaluminate cement, the fly ash, the silica fume, the adhesive powder, the water-reducing agent, and water accounting for 90% of the total water volume into pressure tank A, and stir evenly under pressure to obtain cement paste; 2) Dissolve the compound foaming agent and the compound foam stabilizer in water accounting for 10% of the total water volume, and then place them in pressure tank B with the same pressure as pressure tank A and stir evenly to obtain pre-made foam; 3) Add the pre-made foam from pressure tank B to the cement slurry from pressure tank A and mix. Keep the pressure of pressure tank A constant during the mixing process. After the mixture is evenly mixed, open the pressure relief valve of pressure tank A to allow the mixed slurry to expand under normal pressure, thereby obtaining an ultra-lightweight organic-inorganic composite thermal insulation material.

2. The ultralight organic-inorganic composite thermal insulation material according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent with a solid content of 30%-40% and a water reduction rate of 30%.

3. A method for preparing the ultralight organic-inorganic composite thermal insulation material according to any one of claims 1-2, characterized in that, Includes the following steps: 1) Pour the sulfoaluminate cement, the fly ash, the silica fume, the adhesive powder, the water-reducing agent, and water accounting for 90% of the total water volume into pressure tank A, and stir evenly under pressure to obtain cement paste; 2) Dissolve the compound foaming agent and the compound foam stabilizer in water accounting for 10% of the total water volume, and then place them in pressure tank B with the same pressure as pressure tank A and stir evenly to obtain pre-made foam; 3) Add the pre-made foam from pressure tank B to the cement slurry from pressure tank A and mix. Keep the pressure of pressure tank A constant during the mixing process. After the mixture is evenly mixed, open the pressure relief valve of pressure tank A to allow the mixed slurry to expand under normal pressure, thereby obtaining an ultra-lightweight organic-inorganic composite thermal insulation material.

4. The method according to claim 3, characterized in that, The pressure of the pressure tank A mentioned in step 1) is 0.3-0.8 MPa, and the stirring time of the pressure stirring is 100-150s.

5. The method according to claim 3, characterized in that, The stirring speed in step 2) is 400-600 rpm and the stirring time is 30-60 s.

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