An interior wall thermal insulation paste, a preparation method and application thereof

Abstract

The application belongs to the technical field of thermal insulation paste, and discloses an interior wall thermal insulation paste, a preparation method and application thereof.The interior wall thermal insulation paste comprises the following components: water glass, hollow glass microspheres, organic polymer emulsion, fumed silica, dispersant, silane coupling agent, anti-cracking fiber, aerogel powder, acrylamide / sodium acrylate copolymer, additive and water; the preparation process of step-by-step dispersion and mixing dispersion is adopted, so that the filler in the interior wall thermal insulation paste is uniformly dispersed, thereby achieving the purpose of controlling the cost by using a small amount of filler while ensuring that the interior wall thermal insulation paste has excellent flame retardance and heat insulation; the obtained interior wall thermal insulation paste has low thermal conductivity and excellent heat insulation performance, and the flame retardance grade can reach A1, so that the interior wall thermal insulation paste has excellent flame retardance, and the problems existing in the prior art can be solved, and the application of higher requirement thermal insulation paste can be met.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation paste technology, and in particular to an interior wall thermal insulation paste, its preparation method and application. Background Technology

[0002] With the implementation of the "General Standard for Building Energy Conservation and Renewable Energy Utilization," higher requirements have been placed on building energy efficiency indicators and building quality. However, with the frequent occurrence of fires and detachment accidents involving external wall insulation materials, the fire safety of insulation systems has become a key focus in the construction industry. Therefore, the current trend in the development of insulation materials is shifting from external wall insulation materials to internal wall insulation materials.

[0003] Currently, interior wall insulation materials mainly consist of polystyrene composite boards such as extruded polystyrene foam (XPS) and polystyrene foam (EPS). However, polystyrene composite boards used for interior wall insulation are made by splicing multiple boards together, resulting in numerous seams. After applying putty and paint to these seams, cracking is prone to occur. This has been a persistent problem in the application of polystyrene composite boards, significantly hindering their development in the field of interior wall insulation.

[0004] Aerogel insulation paste is a novel type of insulation paste with excellent thermal insulation properties. However, existing aerogel insulation pastes struggle to ensure uniform distribution of the aerogel material during manufacturing, allowing heat to bypass the aerogel and continue to be transferred. Furthermore, the mixing of aerogel with liquid media during formulation inevitably damages the nanoporous structure within the aerogel, preventing it from fully realizing its potential. Simultaneously, the production of aerogel insulation paste requires specialized processes and equipment, resulting in high costs and limiting its application. Therefore, there is an urgent need in this field to develop an interior wall insulation paste that is low-cost, simple to prepare, and possesses excellent thermal insulation and flame-retardant properties. Summary of the Invention

[0005] The purpose of this invention is to provide an interior wall insulation paste, its preparation method and application, in order to solve the problems of complex production process, high cost and the inability of aerogel to be uniformly dispersed, which leads to a decrease in heat insulation and flame retardant performance of existing aerogel insulation pastes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides an interior wall insulation paste, comprising the following components in parts by weight: 15-25 parts water glass, 18-28 parts hollow glass microspheres, 10-20 parts organic polymer emulsion, 0.5-1.5 parts fumed silica, 5-10 parts dispersant, 0.1-0.5 parts silane coupling agent, 0.1-0.3 parts crack-resistant fiber, 0.5-5 parts aerogel powder, 0.1-1 parts acrylamide / sodium acrylate copolymer, 0.5-5 parts additives, and 15-35 parts water.

[0008] Preferably, the water glass has the general formula R2O·nSiO2, where R is potassium ion, sodium ion, lithium ion or ammonium ion, and n is 1.5 to 3.5; the hollow glass microspheres have a particle size of 20 to 80 μm.

[0009] Preferably, the organic polymer emulsion is one or more of pure acrylic emulsion, styrene-acrylic emulsion, silicone-acrylic emulsion, polyurethane emulsion, epoxy emulsion, and organosilicon emulsion; the silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, methyltrimethoxysilane, and methyltriethoxysilane.

[0010] Preferably, the aerogel powder is silica aerogel powder; the additives include defoamer, leveling agent and antibacterial agent, and the mass ratio of defoamer, leveling agent and antibacterial agent is 1-3:2-3:3.

[0011] The present invention also provides a method for preparing the aforementioned interior wall insulation paste, comprising the following steps:

[0012] (1) Mix water glass, hollow glass microspheres, dispersant, silane coupling agent and some water to obtain hollow glass microsphere dispersion;

[0013] (2) Mix fumed silica, aerogel powder, acrylamide / sodium acrylate copolymer and remaining water to obtain an aerogel aqueous solution;

[0014] (3) The hollow glass microsphere dispersion, aerogel aqueous solution, organic polymer emulsion, crack-resistant fiber and additives are mixed to obtain the interior wall insulation paste.

[0015] Preferably, in step (1), the mixing time is 1.5 to 3 hours; in step (2), the mixing time is 0.5 to 2 hours.

[0016] Preferably, in step (3), the mixing includes the following steps: first mixing the hollow glass microsphere dispersion and the aerogel aqueous solution to obtain a mixed solution, and second mixing the mixed solution, organic polymer emulsion, crack-resistant fiber and additives to obtain an interior wall insulation paste; the first mixing time is 20 to 50 minutes; the second mixing time is 0.5 to 2 hours.

[0017] Preferably, in steps (1), (2) and (3), the mixing is a stirring mixture, and the stirring rate is independently 500 to 800 r / min.

[0018] Preferably, in step (1), the amount of water used accounts for 50-70% of the total mass of water.

[0019] The present invention also provides the application of the aforementioned interior wall insulation paste in environmentally friendly building materials.

[0020] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] (1) This invention provides an interior wall insulation paste with water glass as the main adhesive, relatively inexpensive hollow glass microspheres as the main filler, aerogel as the auxiliary filler, and other additives. The resulting interior wall insulation paste has high bonding strength, excellent fire resistance limit, excellent thermal insulation performance (thermal conductivity of 0.03~0.039W / (m·K)) and Class A combustion performance. It also has advantages such as being non-toxic and harmless, having good environmental compatibility, durability, waterproof performance, impact resistance, and good adhesion to the substrate.

[0022] (2) The present invention uses a preparation process of first dispersing in steps and then mixing and dispersing to make the filler in the interior wall insulation paste disperse evenly, thereby achieving the purpose of controlling costs by using a small amount of filler, while ensuring that the interior wall insulation paste has excellent flame retardancy and heat insulation properties. Detailed Implementation

[0023] This invention provides an interior wall insulation paste, comprising the following components in parts by weight: 15-25 parts water glass, 18-28 parts hollow glass microspheres, 10-20 parts organic polymer emulsion, 0.5-1.5 parts fumed silica, 5-10 parts dispersant, 0.1-0.5 parts silane coupling agent, 0.1-0.3 parts crack-resistant fiber, 0.5-5 parts aerogel powder, 0.1-1 parts acrylamide / sodium acrylate copolymer, 0.5-5 parts additives, and 15-35 parts water.

[0024] In this invention, the amount of water glass is preferably 18-22 parts, more preferably 19-21 parts, and even more preferably 20 parts; the amount of hollow glass microspheres is preferably 20-25 parts, more preferably 22-24 parts, and even more preferably 23 parts; the amount of organic polymer emulsion is preferably 12-18 parts, more preferably 14-16 parts, and even more preferably 15 parts; the amount of fumed silica is preferably 0.6-1.4 parts, more preferably 0.8-1.1 parts, and even more preferably 0.9-1 part; the amount of dispersant is preferably 6-9 parts, more preferably 7-8 parts, and even more preferably 7.5 parts; the amount of silane coupling agent is preferably 0.2-0.4 parts, more preferably... The amount of the following components is preferred: 0.25-0.35 parts, more preferably 0.3 parts; the amount of the anti-crack fiber is preferably 0.15-0.25 parts, more preferably 0.18-0.24 parts, more preferably 0.2 parts; the amount of the aerogel powder is preferably 1-4.5 parts, more preferably 2-4 parts, more preferably 3 parts; the amount of the acrylamide / sodium acrylate copolymer is preferably 0.2-0.8 parts, more preferably 0.3-0.6 parts, more preferably 0.4-0.5 parts; the amount of the additive is preferably 1-4.5 parts, more preferably 2-4 parts, more preferably 3 parts; the amount of water is preferably 18-30 parts, more preferably 20-28 parts, more preferably 24-26 parts.

[0025] In this invention, the water glass preferably has the general formula R2O·nSiO2, where R is preferably potassium ion, sodium ion, lithium ion or ammonium ion, and n is preferably 1.5 to 3.5, more preferably 2 to 3, and even more preferably 2.2 to 2.8; the hollow glass microspheres preferably have a particle size of 20 to 80 μm, more preferably 22 to 75 μm, and even more preferably 25 to 65 μm; the hollow glass microspheres preferably include two or more hollow glass microspheres with different particle sizes.

[0026] In this invention, the organic polymer emulsion is preferably one or more of pure acrylic emulsion, styrene-acrylic emulsion, silicone-acrylic emulsion, polyurethane emulsion, epoxy emulsion, and organosilicon emulsion; the silane coupling agent is preferably one or more of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, methyltrimethoxysilane, and methyltriethoxysilane.

[0027] In this invention, the aerogel powder is preferably silica aerogel powder; the density of the aerogel powder is preferably 180-220 kg / m³. 3 Further preferred is 190–210 kg / m³ 3 More preferably 200 / m 3 .

[0028] In this invention, the additives preferably include defoamers, leveling agents, and antibacterial agents. The mass ratio of defoamers, leveling agents, and antibacterial agents is preferably 1-3:2-3:3, more preferably 1.5-2.5:2.2-2.8:3, and even more preferably 2:2.5-2.6:3. The defoamer is preferably one or more of polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, and polydimethylsiloxane. The leveling agent is preferably an acrylic leveling agent or an organosilicon leveling agent. The antibacterial agent is preferably chitosan, castor oil, or ammonium dihydrogen phosphate.

[0029] The present invention also provides a method for preparing the aforementioned interior wall insulation paste, comprising the following steps:

[0030] (1) Mix water glass, hollow glass microspheres, dispersant, silane coupling agent and some water to obtain hollow glass microsphere dispersion;

[0031] (2) Mix fumed silica, aerogel powder, acrylamide / sodium acrylate copolymer and remaining water to obtain an aerogel aqueous solution;

[0032] (3) The hollow glass microsphere dispersion, aerogel aqueous solution, organic polymer emulsion, crack-resistant fiber and additives are mixed to obtain the interior wall insulation paste.

[0033] In step (1) of the present invention, the mixing time is preferably 1.5 to 3 hours, more preferably 2 to 2.5 hours, and even more preferably 130 to 140 minutes; in step (2), the mixing time is preferably 0.5 to 2 hours, more preferably 1 to 1.5 hours, and even more preferably 70 to 80 minutes.

[0034] In step (3) of the present invention, the mixing includes the following steps: first mixing the hollow glass microsphere dispersion and the aerogel aqueous solution to obtain a mixed solution, and second mixing the mixed solution, organic polymer emulsion, crack-resistant fiber and additives to obtain an interior wall insulation paste; the first mixing time is preferably 20-50 min, more preferably 30-40 min, and more preferably 35 min; the second mixing time is preferably 0.5-2 h, more preferably 1-1.5 h, and more preferably 70-80 min.

[0035] In steps (1), (2) and (3) of the present invention, the mixing is preferably stirring, and the stirring rate is preferably 500-800 r / min, more preferably 600-750 r / min, and even more preferably 650-700 r / min.

[0036] In step (1) of the present invention, the amount of water used is preferably 50-70% of the total mass of water, more preferably 55-68% of the total mass of water, and even more preferably 60-66% of the total mass of water.

[0037] In this invention, the sum of the amount of water used in step (1) and the amount of water used in step (2) is the total mass of water in the components of the interior wall insulation paste.

[0038] The present invention also provides the application of the aforementioned interior wall insulation paste in environmentally friendly building materials.

[0039] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0040] The dispersant used in the following examples and comparative examples is BYK (Germany), and the density of the aerogel powder used is 190 kg / m³. 3 The water glass used was selected from sodium silicate type water glass from Beijing Hongxing Sodium Silicate Factory, and the leveling agent used was BYK-346 leveling agent.

[0041] Example 1

[0042] A hollow glass microsphere dispersion was obtained by stirring 20g of water glass, 15g of water, 0.5g of γ-aminopropyltriethoxysilane, 6g of BYK-102 dispersant, 12g of hollow glass microspheres with a particle size of 25μm, and 12g of hollow glass microspheres with a particle size of 65μm at room temperature for 2h at 750r / min. An aerogel aqueous solution was obtained by stirring 2g of silica aerogel powder, 1g of acrylamide / sodium acrylate copolymer, 0.5g of fumed silica, and 15g of water at room temperature for 1h at 500r / min. The hollow glass microsphere dispersion and the aerogel aqueous solution were stirred at room temperature for 30min at 750r / min, and then 15g of pure acrylic emulsion, 0.2g of crack-resistant fiber, 0.2g of polyoxyethylene polyoxypropylene pentaerythritol ether, and 0.3g of... BYK-346 leveling agent and 0.3g chitosan were mixed at 750r / min at room temperature for 1 hour to obtain interior wall insulation paste.

[0043] Example 2

[0044] 25g water glass, 15g water, 0.2g methyltrimethoxysilane, 8g BYK-180 dispersant, 14g hollow glass microspheres with a particle size of 25μm, and 14g hollow glass microspheres with a particle size of 65μm were stirred at 750r / min at room temperature for 2h to obtain a hollow glass microsphere dispersion. 1g silica aerogel powder, 0.6g acrylamide / sodium acrylate copolymer, 1g fumed silica, and 8g water were stirred at 500r / min at room temperature for 1h to obtain an aerogel aqueous solution. The hollow glass microsphere dispersion and the aerogel aqueous solution were stirred at 750r / min at room temperature for 30min. 12g silicone acrylic emulsion, 0.3g crack-resistant fiber, 0.3g polyoxypropylene polyoxyethylene glycerol ether, 0.3g BYK-346 leveling agent, and 0.3g castor oil were added and stirred at 750r / min at room temperature for 1h to obtain an interior wall insulation paste.

[0045] Example 3

[0046] 20g of water glass, 15g of water, 0.3g of γ-aminopropyltriethoxysilane, 6g of BYK-102 dispersant, 13g of hollow glass microspheres with a particle size of 25μm, and 13g of hollow glass microspheres with a particle size of 65μm were stirred at 750r / min at room temperature for 2h to obtain a hollow glass microsphere dispersion. 0.5g of silica aerogel powder, 0.2g of acrylamide / sodium acrylate copolymer, 1g of fumed silica, and 10g of water were stirred at 500r / min at room temperature for 1h to obtain an aerogel aqueous solution. The hollow glass microsphere dispersion and the aerogel aqueous solution were stirred at 750r / min at room temperature for 30min. 20g of pure acrylic emulsion, 0.2g of crack-resistant fiber, 0.3g of polyoxypropylene glycerol ether, 0.2g of BYK-346 leveling agent, and 0.3g of ammonium dihydrogen phosphate were added and stirred at 750r / min at room temperature for 1h to obtain an interior wall insulation paste.

[0047] Comparative Example 1

[0048] The raw materials and dosages are the same as those described in Example 1, except that each raw material is directly stirred and mixed at room temperature at a speed of 750 r / min for 1 hour to obtain the interior wall insulation paste.

[0049] Comparative Example 2

[0050] The difference from Example 1 is that no acrylamide / sodium acrylate copolymer was added; otherwise, it is the same as Example 1.

[0051] The interior wall insulation pastes obtained in Examples 1-3 and Comparative Examples 1-2 were used to prepare samples with a thickness of 2 mm. The thermal conductivity and flame retardant performance of each sample were tested. The thermal conductivity was tested according to the transient planar heat source test method for thermal conductivity and thermal diffusivity of building materials in GB / T32064-2015. The flame retardant performance was tested according to the burning performance test standard of building materials in GB / T14402. The results are shown in Table 1.

[0052] Table 1. Flame retardant and thermal insulation properties of the interior wall insulation pastes obtained in Examples 1-3 and Comparative Examples 1-2

[0053]

[0054]

[0055] As shown in Table 1, the present invention optimizes the composition and preparation process of the interior wall insulation paste, resulting in an interior wall insulation paste with low thermal conductivity, excellent heat insulation performance, and a flame retardant rating of A1, exhibiting excellent flame retardant performance.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An interior wall insulation compound, characterized in that, The product comprises the following components in parts by weight: 15-25 parts water glass, 18-28 parts hollow glass microspheres, 10-20 parts organic polymer emulsion, 0.5-1.5 parts fumed silica, 5-10 parts dispersant, 0.1-0.5 parts silane coupling agent, 0.1-0.3 parts crack-resistant fiber, 0.5-5 parts aerogel powder, 0.1-1 parts acrylamide / sodium acrylate copolymer, 0.5-5 parts additives, and 15-35 parts water. The aerogel powder is silica aerogel powder; the additives include defoamer, leveling agent and antibacterial agent, and the mass ratio of defoamer, leveling agent and antibacterial agent is 1-3:2-3:3; the antibacterial agent is chitosan, castor oil or ammonium dihydrogen phosphate; The preparation method of the interior wall insulation paste includes the following steps: (1) Mix water glass, hollow glass microspheres, dispersant, silane coupling agent and some water to obtain hollow glass microsphere dispersion; (2) Mix fumed silica, aerogel powder, acrylamide / sodium acrylate copolymer and remaining water to obtain an aerogel aqueous solution; (3) The hollow glass microsphere dispersion, aerogel aqueous solution, organic polymer emulsion, crack-resistant fiber and additives are mixed to obtain the interior wall insulation paste.

2. The interior wall insulation compound according to claim 1, characterized in that, The water glass has the general formula R2O·nSiO2, where R is potassium ion, sodium ion, lithium ion or ammonium ion, and n is 1.5 to 3.5; the hollow glass microspheres have a particle size of 20 to 80 μm.

3. The interior wall insulation compound according to claim 2, characterized in that, The organic polymer emulsion is one or more of the following: pure acrylic emulsion, styrene-acrylic emulsion, silicone-acrylic emulsion, polyurethane emulsion, epoxy emulsion, and organosilicon emulsion; the silane coupling agent is one or more of the following: γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, methyltrimethoxysilane, and methyltriethoxysilane.

4. The method for preparing the interior wall insulation paste according to any one of claims 1 to 3, characterized in that, Includes the following steps: (1) Mix water glass, hollow glass microspheres, dispersant, silane coupling agent and some water to obtain hollow glass microsphere dispersion; (2) Mix fumed silica, aerogel powder, acrylamide / sodium acrylate copolymer and remaining water to obtain an aerogel aqueous solution; (3) The hollow glass microsphere dispersion, aerogel aqueous solution, organic polymer emulsion, crack-resistant fiber and additives are mixed to obtain the interior wall insulation paste.

5. The method for preparing the interior wall insulation paste according to claim 4, characterized in that, In step (1), the mixing time is 1.5 to 3 hours; in step (2), the mixing time is 0.5 to 2 hours.

6. The method for preparing the interior wall insulation paste according to claim 4 or 5, characterized in that, In step (3), the mixing includes the following steps: the hollow glass microsphere dispersion and the aerogel aqueous solution are first mixed to obtain a mixed solution, and the mixed solution, organic polymer emulsion, crack-resistant fiber and additives are second mixed to obtain an interior wall insulation paste; the first mixing time is 20 to 50 minutes; the second mixing time is 0.5 to 2 hours.

7. The method for preparing the interior wall insulation paste according to claim 4, characterized in that, In steps (1), (2) and (3), the mixing is a stirring mixture, and the stirring rate is independently 500 to 800 r / min.

8. The method for preparing the interior wall insulation paste according to claim 6, characterized in that, In step (1), the amount of water used accounts for 50-70% of the total mass of water.

9. The application of the interior wall insulation paste according to any one of claims 1 to 3 in environmentally friendly building materials.

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