Preparation of foam concrete foaming agent and application of foam concrete foaming agent in fiber-reinforced foam concrete vacuum insulation board

Abstract

The invention provides preparation of a foam concrete foaming agent and application of the foam concrete foaming agent in a fiber-reinforced foam concrete vacuum insulation board. The insulation board core material is composed of a foam concrete base body and glass fiber reinforcing materials evenly distributed in the foam concrete base body, the outer portion of the insulation board core material is wrapped with a layer of thermal shrinkage film and a gas insulation wrapping bag, and the insulation board has excellent thermal insulation performance, mechanical performance and flame retardant performance. The preparation process comprises the following steps: firstly, preparing a foaming agent, namely compounding a surfactant (comprising cocamidopropyl betaine and lauryl sodium sulfate) and a foam stabilizer (nano ettringite particles and polyvinyl alcohol) to prepare the foaming agent; mixing water, cement, fly ash, a foaming agent and glass fibers to prepare foam concrete slurry; adding a glass fiber reinforced material and uniformly stirring; pouring the mixture into a mold for molding; the tensile strength, compressive strength and bending toughness of the foam concrete insulation board prepared by using the foaming agent are remarkably improved, the insulation board has the characteristics of light weight, high strength and the like, the flame retardant property is also remarkably improved, and the foam concrete insulation board can be widely applied to the fields of building external wall insulation, roof heat insulation and the like.

Description

Technical Field

[0001] The invention belongs to the field of building thermal insulation materials, in particular to the preparation of a foam concrete foaming agent and the application of the foam concrete foaming agent in a fiber-reinforced foam concrete vacuum thermal insulation board. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] In the field of construction, the performance of thermal insulation materials has a profound impact on building energy conservation and living quality. As building energy conservation standards continue to improve, the market has put forward higher requirements for thermal insulation materials. Traditional thermal insulation materials such as polystyrene foam boards, although they have certain thermal insulation capabilities, have poor fire resistance, are easy to burn when exposed to open flames, and will release toxic gases, posing serious safety hazards. At the same time, they are not easy to degrade and will cause long-term pollution to the environment. Polyurethane foam insulation boards also have the problem of being flammable, and the chemicals used in the production process are harmful to the environment.

[0004] As an emerging thermal insulation material, foam concrete has attracted much attention due to its lightweight, thermal insulation, heat insulation, sound insulation and fire resistance. However, ordinary foam concrete has weak mechanical properties, low tensile strength, compressive strength and flexural toughness, which limits its application in scenarios with high strength requirements. Moreover, the foam prepared by ordinary foaming agents is not stable enough, resulting in an uneven pore structure of foam concrete, affecting its overall performance. In order to enhance the performance of foam concrete, adding fiber reinforcement materials is a common method, and glass fiber is often selected due to its high strength, high modulus and good chemical stability. However, how to optimize the foaming agent formula to improve the overall performance of foam concrete is still a difficult problem facing the industry.

[0005] In terms of the structure of the insulation board, the wrapping materials and sealing processes of the existing insulation boards have defects. Some wrapping materials have poor air barrier properties, causing gas leakage inside the insulation board and reducing the insulation performance. In addition, the traditional wrapping and sealing processes are complicated and are not conducive to large-scale production and application. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a preparation method of a foam concrete foaming agent and application of the foam concrete foaming agent in a fiber reinforced foam concrete vacuum insulation board.

[0007] The surfactant after the present invention utilizes cocamidopropyl betaine and sodium lauryl sulfate compound can more effectively reduce the surface tension of the gas-liquid interface, so that the liquid film of the foam is more stable. The amphoteric structure of cocamidopropyl betaine enables it to maintain good surface activity under different pH environments. In combination with sodium lauryl sulfate, it can broaden the pH range applicable to the surfactant and enhance the foam stability and durability under various conditions. As an inorganic foam stabilizer, ettringite nanoparticles have a large specific surface area and surface energy, can be adsorbed on the surface of the foam liquid film, increase the strength and elasticity of the liquid film, and prevent the foam from bursting. Polyvinyl alcohol is an organic polymer foam stabilizer that can increase the viscosity of the liquid film, reduce the drainage speed of the liquid film, and make the foam more stable. The two are compounded to form an organic-inorganic synergistic effect, which can significantly extend the life of the foam and improve the stability of the foam concrete during the preparation and molding process. The foaming agent prepared by the present invention is used in foam concrete to significantly improve the tensile strength, compressive strength and bending toughness of the foam concrete insulation board. At the same time, the insulation board has the characteristics of light weight, high strength and excellent flame retardant performance. In addition, the present invention solves the problems of air isolation and sealing through an innovative insulation board structure design, using a combination of a heat shrink film with air holes and circular protrusions and an air-tight wrapping bag, giving it broad application prospects in the fields of building exterior wall insulation, roof insulation, etc.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a foam concrete foaming agent, which is composed of the following raw materials in weight percentage: 1-1.5wt% of a surfactant, 2-2.5wt% of a foam stabilizer, 0.5-1wt% of a silane coupling agent, and the remainder is water;

[0010] Wherein, the foam stabilizer comprises: nano-ettringite particles and polyvinyl alcohol.

[0011] In some embodiments, the surfactant includes: cocamidopropyl betaine and sodium lauryl sulfate.

[0012] The second aspect of the present invention provides a method for preparing a foam concrete foaming agent, comprising:

[0013] The surfactant solution is heated to a predetermined temperature, a foam stabilizer is added, and the mixture is mixed evenly, and then a silane coupling agent is added, and the mixture is mixed evenly to obtain the product.

[0014] In some embodiments, the foam stabilizer is formed by mixing nano-ettringite particles with a polyvinyl alcohol solution.

[0015] In some embodiments, the preparation method of the nano calcium sulfonate particles includes: preparing with aluminum sulfate 18hydrate, calcium oxide and a surfactant sodium hexametaphosphate in an alkaline solution environment, wherein the molar ratio of aluminum sulfate 18hydrate to calcium oxide is 1:6-8, the mass fraction of sodium hexametaphosphate is 1-1.5wt%, and during the preparation process, the pH is maintained at 10-12.

[0016] Preferably, the molar ratio of aluminum sulfate 18hydrate to calcium oxide is 1:6, and the mass fraction of sodium hexametaphosphate is 1 wt %.

[0017] In some embodiments, the specification of the silane coupling agent is KH570.

[0018] The third aspect of the present invention provides the use of the above-mentioned foam concrete foaming agent in the preparation of a fiber-reinforced foam concrete vacuum insulation board.

[0019] The fourth aspect of the present invention provides a fiber-reinforced foam concrete vacuum insulation board, comprising: a glass fiber reinforced foam concrete core material, a heat shrinkable film and an air-tight wrapping bag, wherein the heat shrinkable film is provided with a plurality of air holes, and the heat shrinkable film is wrapped around the outside of the foam concrete core material to form a pre-installed board core; the pre-installed board core is vacuum-sealed and wrapped by the air-tight wrapping bag; both ends of the air-tight wrapping bag are provided with process reserved edges, which are folded over and pasted on the board surface formed by the air-tight wrapping bag.

[0020] In some embodiments, the glass fiber reinforced foam concrete core material is composed of the following raw materials in parts by weight: 0.45-0.5 parts of water, 1-1.2 parts of cement, 0.25-0.3 parts of fly ash, 0.01-0.012 parts of foaming agent, and 0.006-0.008 parts of glass fiber.

[0021] Preferably, water, cement, fly ash, foaming agent and glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006.

[0022] In some embodiments, the cement is ordinary Portland cement.

[0023] In some embodiments, the heat shrinkable film has a plurality of circular protrusions on its surface and a plurality of air holes on its surface, wrapping the core material.

[0024] A fifth aspect of the present invention provides a method for preparing the above-mentioned fiber reinforced foam concrete vacuum insulation board, comprising:

[0025] Take part of cement, part of fly ash and all of the water, mix well to obtain slurry;

[0026] Mix the remaining materials evenly to obtain a mixture;

[0027] Taking part of the mixture and adding it to the slurry and mixing it evenly, then adding the remaining mixture and mixing it evenly to obtain fiber cement slurry;

[0028] Foaming the foaming agent, adding the obtained foam into the fiber cement slurry and mixing evenly to obtain glass fiber foam concrete slurry;

[0029] pouring the glass fiber foam concrete slurry into a mold, curing, and demoulding to obtain a glass fiber reinforced foam concrete core material;

[0030] Wrapping the glass fiber reinforced foam concrete core material with heat shrink film to form a prefabricated panel core;

[0031] The pre-installed board core is wrapped with an air-tight wrapping bag, and both ends of the air-tight wrapping bag form process reserved edges, and the process reserved edges are folded and pasted on the board surface formed by the air-tight wrapping bag to obtain the board core.

[0032] More specifically, they include:

[0033] Step 1: First, use aluminum sulfate 18hydrate, calcium oxide and surfactant sodium hexametaphosphate to prepare nano calcium sulfonate particles in an alkaline environment for use. Heat the polyvinyl alcohol particles in a water bath at 95°C in deionized water for use. Dissolve 1wt% of surfactant (including cocamidopropyl betaine and sodium lauryl sulfate) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of foam stabilizer (including nano calcium sulfonate particles and polyvinyl alcohol), add a mass fraction of 0.5wt% of silane coupling agent, and stir at 50°C for 2h for use.

[0034] Step 2: Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0035] Step 3: Brush mold release oil on the mold surface, pour the glass fiber foam concrete slurry into the mold to make the surface flat, and under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the test piece mold to make samples of 40mm×40mm×160mm, and two groups were prepared respectively.

[0036] Step 4: Wrap the glass fiber reinforced foam concrete core material with a heat shrink film to form a pre-installed board core.

[0037] Step 5: Wrap the core material with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag form process reserved edges, and the process reserved edges are folded and adhered to the board surface formed by the air-tight wrapping bag.

[0038] Beneficial Effects of the Invention

[0039] (1) The tensile strength, compressive strength and flexural toughness of the foamed concrete insulation board prepared by the foaming agent of the present invention are significantly improved. The insulation board of the present invention not only has the characteristics of light weight and high strength, but also has significantly improved flame retardant properties, and can be widely used in the fields of building exterior wall insulation, roof insulation, etc.

[0040] (2) The preparation method of the present invention is simple, practical and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0042] Figure 1 A schematic diagram of the glass fiber reinforced foam concrete vacuum insulation board;

[0043] Figure 2 1-1 is a cross-sectional view of a schematic diagram of the glass fiber reinforced foam concrete vacuum insulation board. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0046] Compressive strength test: According to GB / T 5486-2008 "Test methods for inorganic rigid thermal insulation products", the maximum load-bearing capacity is determined by applying a compressive load until the sample is destroyed. The sample is placed in the center of the test machine platen, and pressure is applied at a constant loading rate (1mm / min) until the sample is destroyed. The maximum load is recorded and the compressive strength (unit: MPa) is calculated.

[0047] Tensile strength test: According to GB / T 5486-2008 "Test methods for inorganic rigid thermal insulation products", place the sample symmetrically on the support roller with a span of 100mm, ensure that the sample is in good contact with the support roller and the loading roller, and avoid eccentric loading. Load at a constant rate of 50N / s until the sample breaks, and record the maximum load.

[0048] Flexural strength test: According to GB / T 17671-1999 "Test Method for Strength of Cement Mortar (ISO Method)", the maximum load-bearing capacity of the sample under bending load is determined by three-point or four-point bending test. The sample is placed on the support roller of the testing machine to ensure that the span meets the standard. The bending load is applied at a constant loading rate (0.5mm / min) until the sample breaks. The maximum load is recorded and the flexural strength (unit: MPa) is calculated.

[0049] Thermal conductivity test: According to GB / T 10295-2008 "Determination of steady-state thermal resistance and related properties of thermal insulation materials - Heat flow meter method", the thermal conductivity is calculated by measuring the temperature gradient and heat flux density of the material under steady-state heat flow conditions. Place the sample in the test equipment to ensure good contact with the hot plate. Apply a constant heat flow and measure the temperature difference on both sides of the sample. Calculate the thermal conductivity (unit: W / (m·K)) based on the heat flux density and temperature gradient.

[0050] Fire rating test: According to GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products", place the sample in a combustion test chamber and ignite the fire source. Observe the burning time, flame spread speed, smoke generation and other indicators of the sample. Evaluate the fire rating based on the test results.

[0051] Example 1

[0052] First, aluminum sulfate 18 hydrate and calcium oxide with a molar ratio of 1:6 and 1wt% surfactant (sodium hexametaphosphate) were used in an alkaline environment (keeping the pH at 10-12, adding sodium hydroxide solution every hour, stirring at 25°C for 6 hours, standing for 12 hours, centrifuging at 8000r, 2min and washing three times with deionized water for standby) to prepare nano calcium sulfonate particles for standby. 10g of polyvinyl alcohol particles were heated and dissolved in 90g of deionized water at 95°C for standby. 1wt% of surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:1) was dissolved in deionized water, and the temperature was set to 50°C for water bath heating, and then a foam stabilizer with a total mass fraction of 2wt% (nano calcium sulfonate particles: polyvinyl alcohol = 3:1) was added, and a silane coupling agent with a mass fraction of 0.5wt% was added, and stirred at 50°C for 2h for standby.

[0053] The preparation method of the foam stabilizer includes: first diluting the nano-ettringite particles and ultrasonically dispersing them for 15 minutes, then adding the nano-ettringite dispersion dropwise into the PVA solution under magnetic stirring at 50° C. Stirring is continued for 1-2 hours to ensure uniform mixing, followed by a second ultrasonic treatment for 5 minutes to further eliminate agglomerations.

[0054] Water, cement, fly ash, foaming agent, glass fiber are mixed in a mass ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials (cement, fly ash, glass fiber), pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0055] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0056] Example 2

[0057] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Heat 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C for dissolution. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:1) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 1:1), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0058] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0059] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0060] Example 3

[0061] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Heat 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C for dissolution. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:1) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 1:3), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0062] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0063] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0064] Example 4

[0065] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Heat 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C for dissolution. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 3:1) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 1:1), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0066] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0067] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0068] Example 5

[0069] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Heat 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C for dissolution. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:3) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 1:1), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0070] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0071] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0072] Comparative Example 1

[0073] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Dissolve 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C in a water bath for later use. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:1) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 1:0), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0074] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0075] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0076] Comparative Example 2

[0077] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Dissolve 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C in a water bath for later use. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:1) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 0:1), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0078] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0079] Brush release oil on the mold surface, pour the above-mentioned glass fiber foam concrete slurry into the mold to make the surface smooth. Under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. Experiments were conducted on the prepared foam concrete material, and part of the material was taken out and put into the specimen mold to make samples with a specification of 40mm×40mm×160mm, and two groups were prepared respectively. The glass fiber reinforced foam concrete core material was wrapped with a heat shrink film to form a pre-installed board core. The core material was wrapped with an air-tight wrapping bag, and the two ends of the air-tight wrapping bag formed a process reserved edge, and the process reserved edge was folded and pasted on the board surface formed by the air-tight wrapping bag.

[0080] Comparative Example 3

[0081] First, prepare nano calcium sulfonate particles in an alkaline environment with a molar ratio of 1:6 aluminum sulfate 18 and calcium oxide and 1wt% of the surfactant sodium hexametaphosphate. Heat 10g of polyvinyl alcohol particles in 90g of deionized water at 95°C for dissolution. Dissolve 1wt% of the surfactant (cocamidopropyl betaine: sodium dodecyl sulfate = 1:1) in deionized water, set the temperature to 50°C for water bath heating, then add a total mass fraction of 2wt% of the foam stabilizer (nano calcium sulfonate particles: polyvinyl alcohol = 1:1), add a mass fraction of 0.5wt% of the silane coupling agent, and stir at 50°C for 2h.

[0082] Water, cement, fly ash, foaming agent, glass fiber are mixed in a ratio of 0.45:1:0.25:0.01:0.006. Weigh each material according to the mix ratio, add half of the cement and half of the fly ash, add all the water, stir slightly, mix the remaining materials, pour half of them into the mixer, stir for 2 minutes, turn over the materials at the bottom after stirring, add the remaining materials and continue stirring for 4 minutes. At the same time, use a foaming machine to foam the foaming agent, add the obtained foam to the fiber cement slurry and mix evenly to obtain glass fiber foam concrete slurry.

[0083] Brush release oil on the mold surface, pour the glass fiber foam concrete slurry into the mold to make the surface flat, and under standard curing conditions, initially cure for 1-2 days, then demold and place for 5-7 days for mid-term curing to obtain the glass fiber reinforced foam concrete core material. The prepared foam concrete material was tested without wrapping the foam concrete with a heat shrink film and an air-tight wrapping bag.

[0084] Table 1 Performance test results of embodiments and comparative examples

[0085]

[0086]

[0087] Comparative Examples 2, 4, and 5, when the ratio of nano-ettringite particles to polyvinyl alcohol in the foam stabilizer is 1: 1, when the ratio of cocamidopropyl betaine and sodium lauryl sulfate is 1: 1 (Example 2), the compressive, tensile and flexural strengths of the insulation board are relatively high, and the thermal conductivity is relatively low. This shows that under this ratio, the synergistic effect of the two surfactants is the best, and the surface tension of the gas-liquid interface can be effectively reduced, a stable foam structure is formed, the compactness and uniformity of the foamed concrete are improved, and then the mechanical properties and thermal insulation properties of the insulation board are improved. Comparative Examples 1, 2, and 3, when the ratio of surfactant cocamidopropyl betaine and sodium lauryl sulfate is 1: 1, when the ratio of nano-ettringite particles to polyvinyl alcohol is 1: 1 (Example 2), the performance is optimal. It is shown that under this ratio, inorganic nano-ettringite particles and organic polyvinyl alcohol have played a good synergistic foam stabilizing effect. Nano-ettringite particles increase the strength and elasticity of the liquid film, and polyvinyl alcohol reduces the liquid film drainage speed, and jointly stabilize the foam, making the pore structure of the foam concrete uniform, and enhancing the comprehensive performance of the insulation board. Comparative Example 1 only uses nano-ettringite particles as a foam stabilizer, and Comparative Example 2 only uses polyvinyl alcohol as a foam stabilizer. The mechanical properties of both are lower than those of Example 2. This shows that a single foam stabilizer cannot effectively stabilize the foam like a composite foam stabilizer, and it is difficult to form a uniform and dense foam concrete structure, resulting in a decrease in the mechanical properties of the insulation board, reflecting the advantages of organic-inorganic composite foam stabilizers. Comparative Example 3 is not wrapped with heat shrinkable film and air-tight wrapping bags, and its thermal conductivity is significantly higher than that of the embodiment. Heat shrinkable film and air-tight wrapping bags can effectively prevent heat transfer, and the vacuum sealing structure reduces gas convection and improves thermal insulation performance, indicating that the insulation board structure design of the present invention is crucial to reducing thermal conductivity and improving thermal insulation effect. It can be seen that Example 2 is the optimal ratio.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foam concrete foaming agent, characterized in that: The method is composed of the following raw materials in percentage by weight: 1-1.5wt% of surfactant, 2-2.5wt% of foam stabilizer, 0.5-1wt% of silane coupling agent, and the remainder is water; Wherein, the foam stabilizer comprises: nano-ettringite particles and polyvinyl alcohol.

2. The foam concrete foaming agent according to claim 1, characterized in that The surfactant includes: cocamidopropyl betaine and sodium lauryl sulfate.

3. A method for preparing a foamed concrete foaming agent, characterized in that: include; The surfactant solution is heated to a predetermined temperature, a foam stabilizer is added, and the mixture is mixed evenly, and then a silane coupling agent is added, and the mixture is mixed evenly to obtain the product.

4. The method for preparing a foamed concrete foaming agent according to claim 3, wherein: The foam stabilizer is prepared by mixing nano-ettringite particles with a polyvinyl alcohol solution.

5. The method for preparing a foamed concrete foaming agent according to claim 3, characterized in that: The preparation method of the nano-ettringite particles comprises: preparing with aluminum sulfate 18hydrate, calcium oxide and a surfactant sodium hexametaphosphate in an alkaline solution environment, wherein the molar ratio of aluminum sulfate 18hydrate to calcium oxide is 1:6-8, the mass fraction of sodium hexametaphosphate is 1-1.5wt%, and during the preparation process, the pH is maintained at 10-12.

6. Use of the foam concrete foaming agent according to claim 1 or 2 in the preparation of fiber-reinforced foam concrete vacuum insulation board.

7. A fiber-reinforced foam concrete vacuum insulation board, characterized in that: include: A glass fiber reinforced foam concrete core material, a heat shrinkable film and an air-tight wrapping bag, wherein the heat shrinkable film is provided with a plurality of air permeable holes, and the heat shrinkable film is wrapped around the outside of the foam concrete core material to form a pre-installed board core; the pre-installed board core is vacuum-sealed and wrapped by the air-tight wrapping bag; both ends of the air-tight wrapping bag are provided with process reserved edges, which are folded over and pasted on the board surface formed by the air-tight wrapping bag.

8. The fiber-reinforced foam concrete vacuum insulation board according to claim 7, characterized in that: The glass fiber reinforced foam concrete core material is composed of the following raw materials in parts by weight: 0.45-0.5 parts of water, 1-1.2 parts of cement, 0.25-0.3 parts of fly ash, 0.01-0.012 parts of foaming agent, and 0.006-0.008 parts of glass fiber.

9. The fiber-reinforced foam concrete insulation board according to claim 3, characterized in that: The surface of the heat shrinkable film is provided with a plurality of circular protrusions, and the heat shrinkable film is provided with a plurality of air permeable holes, wrapping the core material.

10. A method for preparing the fiber-reinforced foam concrete vacuum insulation board according to claim 7 or 8, characterized in that: include: Take part of cement, part of fly ash and all of the water, mix well to obtain slurry; Mix the remaining materials evenly to obtain a mixture; Taking part of the mixture and adding it to the slurry and mixing it evenly, then adding the remaining mixture and mixing it evenly to obtain fiber cement slurry; Foaming the foaming agent, adding the obtained foam into the fiber cement slurry and mixing evenly to obtain glass fiber foam concrete slurry; pouring the glass fiber foam concrete slurry into a mold, curing, and demoulding to obtain a glass fiber reinforced foam concrete core material; Wrapping the glass fiber reinforced foam concrete core material with heat shrink film to form a prefabricated panel core; The pre-installed board core is wrapped with an air-tight wrapping bag, and both ends of the air-tight wrapping bag form process reserved edges, and the process reserved edges are folded and pasted on the board surface formed by the air-tight wrapping bag to obtain the board core.

Images