High temperature resistant composite binder for monolithic materials

Abstract

The application discloses a high-temperature-resistant composite binder of amorphous material and belongs to the technical field of high-temperature-resistant binder preparation. The preparation method of the high-temperature-resistant composite binder comprises the following steps: under the stirring state, adding silicon dioxide nanoparticles into a sodium silicate aqueous solution, and heating and reacting at 50-80 DEG C for 1-3 hours; and the mass ratio of the silicon dioxide nanoparticles and the sodium silicate is 1:5. The composite binder is prepared by compounding sodium silicate and silicon dioxide nanoparticles at a mass ratio of 5:1 and using a step-by-step water adding process. A small amount of water is added in the binder preparation stage to carry out high-concentration composite reaction, which is beneficial to forming a compact three-dimensional silicon-oxygen-silicon network structure; and then water is supplemented in the mixing stage to ensure that the material has a suitable construction viscosity. The composite binder is used to compound additives, aerogel particles, hollow structures and reinforcing phases, is applied on the surface or inside of a pipeline or equipment, can play a heat insulation-sound insulation role, and has high-temperature resistance.

Description

Technical Field

[0001] This invention relates to the field of high-temperature resistant adhesive preparation technology, and in particular to a high-temperature resistant composite adhesive for amorphous materials. Background Technology

[0002] High-temperature pipelines and equipment in fields such as shipbuilding, petrochemicals, and aerospace often require the application of monolithic thermal and sound insulation materials to address the challenges of protecting irregularly shaped structures and gaps. These monolithic materials consist of binders, aggregates, and reinforcing phases, with the binder being the core component determining whether the material can adhere firmly and maintain its function at high temperatures.

[0003] Traditional sodium silicate binders are low in cost and have good heat resistance, but they are prone to dehydration and embrittlement after long-term thermal cycling above 400℃, leading to coating cracking and peeling, affecting the durability of the thermal insulation and sound insulation effect. Chinese patent application CN120795669A discloses a high-temperature resistant, integrated thermal insulation and sound insulation amorphous material and its preparation method. The amorphous material, after optimized proportioning, includes binders, additives, aerogel particles, hollow structural materials, and reinforcing phase materials. These materials are processed to form a highly adhesive amorphous material, which, when applied to the surface of pipes and equipment, can provide thermal insulation and sound insulation. However, its mechanical strength and high-temperature resistance still need improvement. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a high-temperature resistant composite adhesive for amorphous materials.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of the present invention is to provide a method for preparing a high-temperature resistant composite adhesive for amorphous materials, comprising the following steps: adding silica nanoparticles to an aqueous solution of sodium silicate under stirring, and heating and reacting at 50~80°C for 1~3 hours; wherein the mass ratio of the silica nanoparticles to sodium silicate is 1:5.

[0006] As a further improvement of the present invention, the mass ratio of sodium silicate to water in the sodium silicate aqueous solution is 1:(0.5~0.75).

[0007] More preferably, the mass ratio of sodium silicate to water in the sodium silicate aqueous solution is 1:0.5.

[0008] As a further improvement of the present invention, the heating reaction is carried out under water bath heating conditions.

[0009] As a further improvement of the present invention, the modulus of the sodium silicate is 2.0 to 3.5.

[0010] As a further improvement of the present invention, the particle size of the silica nanoparticles is 10~100nm.

[0011] A second aspect of the present invention is to provide a high-temperature resistant composite adhesive for amorphous materials, which is prepared by the above-described preparation method.

[0012] A third aspect of the present invention is to provide the use of a high-temperature resistant composite adhesive for amorphous materials in the preparation of a heat-insulating and sound-insulating protective layer.

[0013] A third aspect of the present invention is to provide a heat-insulating and sound-insulating protective layer, comprising a high-temperature resistant composite binder of the above-mentioned amorphous material, hollow microspheres, aerogel particles, reinforcing phase material and additives; wherein the amount of the high-temperature resistant composite binder added is 13% to 45%; and the amount of the hollow microspheres added is 3% to 10%.

[0014] A method for preparing a heat-insulating and sound-insulating protective layer is as follows: S1. Mix the high-temperature resistant composite adhesive with water to obtain an aqueous mixture; S2. Add hollow microspheres and stir to mix evenly; S3. Add the reinforcing phase material and stir until well mixed; S4. Add the additives and mix thoroughly. S5. Add aerogel particles and stir thoroughly to obtain a paste; apply the paste to the substrate surface and allow it to cure.

[0015] Optionally, the hollow microspheres are selected from one or more of hollow glass microspheres, hollow cenospheres, or hollow ceramic microspheres.

[0016] Optionally, the reinforcing phase material is selected from one or more of glass fiber, high-temperature carbon fiber or aluminum silicate fiber, and its proportion in the total mass of raw materials ranges from 0% to 7%.

[0017] Optionally, the reinforcing phase material has a diameter of approximately 10 μm and a length ranging from 3 mm to 10 mm.

[0018] Optionally, the additive is one or more of sodium dodecylbenzenesulfonate or sodium heavy alkylbenzenesulfonate, and the amount used accounts for 1%-7% of the total mass of the raw materials.

[0019] Optionally, the aerogel is one or more of silica aerogel, silicon carbide aerogel or alumina aerogel, and its amount accounts for 15%-25% of the total mass of the raw materials.

[0020] Optionally, the silica aerogel has a mesh size of 5-20 mesh.

[0021] The fourth aspect of the present invention is to provide an application of a thermal insulation and soundproofing protective layer in the protection of high-temperature pipelines and equipment.

[0022] Optionally, the specific application method is as follows: mix the high-temperature resistant composite adhesive with water to obtain an aqueous phase mixture; add hollow microspheres and stir until uniform; add reinforcing phase material and stir until uniform; add additives and stir until uniform; add aerogel particles and stir thoroughly to obtain a paste; apply the paste to the surface of a steel plate, heat it at 400℃ for 4 hours and then cool it naturally. After repeating this process three times, the coating did not crack or peel off, and the linear shrinkage rate was less than 4%.

[0023] Compared with the prior art, the present invention has at least the following technical effects: This invention relates to a composite adhesive prepared by combining sodium silicate and silica nanoparticles at a mass ratio of 5:1 using a stepwise water addition process. First, a small amount of water is added during the adhesive preparation stage to initiate a high-concentration composite reaction, which facilitates the formation of a dense three-dimensional silicon-oxygen-silicon network structure. Then, during the mixing stage, the remaining water is added until the total water to sodium silicate mass ratio is 90:(10~50), ensuring the material has a suitable application viscosity. This composite adhesive, combined with additives, aerogel particles, hollow microspheres, and reinforcing phases, can be applied to the surface or interior of pipes and equipment to provide thermal and sound insulation. A sample prepared and coated on a steel plate was heated at 400℃ for 4 hours, then cooled to room temperature. This heating process was repeated three times. The standard sample did not crack or detach from the steel plate, and the linear shrinkage rate was less than 4%, indicating that the standard sample can be used at 400℃, demonstrating the material's excellent heat resistance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A front view of the heat insulation and sound insulation material prepared for Example 3 after demolding and drying, ready for measuring the sound insulation using an impedance tube.

[0026] Figure 2 A side view of the heat insulation and sound insulation material prepared for Example 3 after demolding and drying, ready for measuring the sound insulation using an impedance tube.

[0027] Figure 3 Front view of the thermal conductivity measurement of the thermal insulation and sound insulation material prepared in Example 3. Figure 4A side view of the thermal conductivity measurement of the thermal insulation and sound insulation material prepared in Example 3.

[0028] Figure 5 A frontal view of the thermal insulation and sound insulation material prepared in Example 3, showing the compressive strength measurement.

[0029] Figure 6 A side view of the thermal insulation and sound insulation material prepared for Example 3, showing the compressive strength measurement.

[0030] Figure 7 This is a flowchart illustrating the preparation process of the thermal insulation and soundproofing protective layer according to an embodiment of the present invention. Detailed Implementation

[0031] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0032] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0033] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0034] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0035] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0036] This invention discloses a method for preparing a high-temperature resistant composite adhesive for amorphous materials, comprising the following steps: adding silica nanoparticles to an aqueous solution of sodium silicate under stirring, and heating the solution at 50-80°C for 1-3 hours; wherein the mass ratio of silica nanoparticles to sodium silicate is 1:5.

[0037] In some embodiments of the present invention, the mass ratio of sodium silicate to water in the sodium silicate aqueous solution is 1:(0.5~0.75).

[0038] In some embodiments of the present invention, the mass ratio of sodium silicate to water in the sodium silicate aqueous solution is 1:0.5.

[0039] In some embodiments of the present invention, the heating reaction is carried out under water bath heating conditions.

[0040] In some embodiments of the present invention, the modulus of the sodium silicate is 2.0 to 3.5.

[0041] In some embodiments of the present invention, the particle size of the silica nanoparticles is 10~100nm.

[0042] The high-temperature resistant composite adhesive for amorphous materials prepared by the method described in the embodiments of the present invention can be used to prepare a heat-insulating and sound-insulating protective layer.

[0043] In some embodiments, the present invention discloses a heat-insulating and sound-insulating protective layer, comprising the above-mentioned high-temperature resistant composite adhesive, hollow microspheres, aerogel particles, reinforcing phase material and additives; wherein the amount of the high-temperature resistant composite adhesive added is 13%~45%; and the amount of the hollow microspheres added is 3~10%.

[0044] like Figure 7 As shown in some specific embodiments, a method for preparing a heat-insulating and sound-insulating protective layer is as follows: S1. Mix the high-temperature resistant composite adhesive with water to obtain an aqueous mixture; S2. Add hollow microspheres and stir to mix evenly; S3. Add the reinforcing phase material and stir until well mixed; S4. Add the additives and mix thoroughly. S5. Add aerogel particles and stir thoroughly to obtain a paste; apply the paste to the substrate surface and allow it to cure.

[0045] In some specific embodiments, the hollow microspheres are selected from one or more of hollow glass microspheres, hollow cenospheres, or hollow ceramic microspheres.

[0046] In some specific embodiments, the reinforcing phase material is selected from one or more of glass fiber, high-temperature carbon fiber or aluminosilicate fiber, and the amount used accounts for 0%-7% of the total mass of the raw materials.

[0047] In some specific embodiments, the diameter of the reinforcing phase material is about 10 μm and the length ranges from 3 mm to 10 mm.

[0048] In some specific embodiments, the additive is one or more of sodium dodecylbenzenesulfonate or sodium heavy alkylbenzenesulfonate, and the amount used accounts for 1%-7% of the total mass of the raw materials.

[0049] In some specific embodiments, the aerogel is one or more of silica aerogel, silicon carbide aerogel or alumina aerogel, and its amount accounts for 15%-25% of the total mass of the raw materials.

[0050] In some specific embodiments, the silica aerogel has a mesh size of 5-20 mesh.

[0051] The heat insulation and sound insulation protective layer prepared above can be applied to the protection of high-temperature pipelines and equipment.

[0052] In some optional embodiments, the specific application method is as follows: mixing the high-temperature resistant composite adhesive with water to obtain an aqueous phase mixture; adding hollow microspheres and stirring until uniform; adding reinforcing phase material and stirring until uniform; adding additives and stirring until uniform; adding aerogel particles and stirring thoroughly to obtain a paste; applying the paste to the surface of a steel plate, heating at 400°C for 4 hours, and then naturally cooling, repeating this process three times, the coating did not crack or peel off, and the linear shrinkage rate was less than 4%.

[0053] It should be noted that the raw materials used in the embodiments of this invention were all obtained through conventional commercial channels. Specifically, the sodium dodecylbenzenesulfonate had a purity ≥95% and was purchased from Shanghai Guoyao Pharmaceutical Co., Ltd. The hollow glass microspheres were of specification K1, with an average particle size of 100 μm. The glass fibers had a diameter of approximately 10 μm and a length of approximately 6 mm. The aerogel particles were selected with a mesh size of 10 mesh. The silica nanoparticles had an average particle size of 10 nm-100 nm. The sodium silicate modulus was 2.0-3.5.

[0054] Example 1 A high-temperature resistant thermal insulation and soundproofing material of amorphous material, the preparation method of which is as follows: Add 10 g of sodium silicate and 7.5 g of water to a beaker and stir until they are mixed evenly to obtain a sodium silicate solution; add 2 g of silica nanoparticles to the sodium silicate solution and stir until completely dissolved; place the beaker in a 60°C water bath and heat and stir for 2 hours, then cool to obtain a high-temperature resistant composite adhesive; Add 82.5 g of water (to make up to 90 g) to the high-temperature resistant composite adhesive and disperse evenly. Add 10 g of hollow glass microspheres, 3 g of glass fiber, 3 g of sodium dodecylbenzenesulfonate, and 30 g of SiO2 aerogel particles sequentially to a beaker and stir until completely dissolved to obtain a paste. Place the paste in a mold, demold, and dry in an oven. Once dried, it is ready for various data tests. The oven temperature was set to 60℃, and the drying time was 2 days.

[0055] Examples 2-5 A high-temperature heat-insulating and sound-insulating material of amorphous material, the raw material ratio is shown in Table 1, and the preparation method is the same as in Example 1.

[0056] Table 1 Figure 1 A frontal view of the unshaped material prepared for Example 3 after demolding and drying, ready for measuring sound insulation using an impedance tube.

[0057] Figure 2 A side view of the unshaped material prepared for Example 3 after demolding and drying, ready for measuring sound insulation using an impedance tube.

[0058] Figure 3 Front view of the amorphous material prepared in Example 3, used for measuring its thermal conductivity. Figure 4 A side view of the amorphous material prepared in Example 3, showing the thermal conductivity measurement.

[0059] Figure 5 A frontal view of the amorphous material prepared in Example 3, showing the compressive strength measurement.

[0060] Figure 6 A side view of the amorphous material prepared for Example 3, taken during compressive strength measurement.

[0061] The performance of the thermal insulation materials prepared in Examples 1-5 was tested, and the test results are shown in Table 2.

[0062] Table 2 Note: Thermal conductivity was measured using a TC3200 thermal conductivity meter manufactured by Xi'an Xiaxi Electronic Technology Co., Ltd., conforming to ASTM C1113 standard; average sound insulation was measured using an AHAI1032 transfer function sound absorption and insulation measurement system manufactured by Hangzhou Aihua Intelligent Technology Co., Ltd.; compressive strength was determined using a WDW-10E universal mechanical performance testing machine to test the stress-strain curve of the material under compression; bulk density was tested according to GB / T 5480-2008 method; linear shrinkage rate was tested by coating the prepared sample onto a steel plate, heating it at 400℃ for 4 hours, and then cooling it to room temperature. This heating process was repeated three times. The protective layer in Examples 1-5 did not crack and did not peel off from the steel plate.

[0063] As shown in Table 2, comparing the performance data of Examples 1-5, the thermal conductivity of Example 3 is 0.0635 W / m·K, which is only slightly higher than that of Examples 1 and 2, and is still at a low level, ensuring the material's excellent thermal insulation effect. At the same time, its average sound insulation reaches 29.5 dB, which is 30.5% higher than that of Example 1 and 4.6% higher than that of Example 2, significantly enhancing its sound insulation performance. Its compressive strength is 0.38 MPa, which is 6.3 times that of Example 1 and 2.0 times that of Example 2, greatly improving its mechanical load-bearing capacity and meeting the strength requirements for construction and use of monolithic materials. Its bulk density is 216.8 kg / m³, which is much lower than that of Example 4 (244.3 kg / m³) and Example 5 (296.5 kg / m³), taking into account the needs of lightweight applications.

[0064] Although Examples 1 and 2 have lower thermal conductivity, their sound insulation and mechanical strength are insufficient, failing to meet the comprehensive requirements of complex working conditions. While Examples 4 and 5 exhibit excellent sound insulation and compressive strength, their thermal conductivity (0.0700 W / m·K and 0.0752 W / m·K, respectively) and bulk density are significantly increased, sacrificing the material's thermal insulation and lightweight advantages. Therefore, Example 3 achieves the best balance between thermal insulation, sound insulation, mechanical strength, and bulk density, resulting in the best overall performance and making it most suitable for use as a binder for amorphous materials.

[0065] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for preparing a high-temperature resistant composite adhesive for amorphous materials, characterized in that, The process includes the following steps: adding silica nanoparticles to an aqueous solution of sodium silicate under stirring, and heating the solution at 50-80°C for 1-3 hours; the mass ratio of the silica nanoparticles to sodium silicate is 1:

5.

2. The method for preparing the high-temperature resistant composite adhesive for amorphous materials according to claim 1, characterized in that, The mass ratio of sodium silicate to water in the sodium silicate aqueous solution is 1:(0.5~0.75).

3. The method for preparing the high-temperature resistant composite adhesive for amorphous materials according to claim 1, characterized in that, The mass ratio of sodium silicate to water in the sodium silicate aqueous solution is 1:0.

5.

4. The method for preparing the high-temperature resistant composite adhesive for amorphous materials according to claim 1, characterized in that, The heating reaction is carried out under water bath heating conditions.

5. The method for preparing the high-temperature resistant composite adhesive for amorphous materials according to claim 1, characterized in that, The modulus of the sodium silicate is 2.0 to 3.

5.

6. The method for preparing the high-temperature resistant composite adhesive for amorphous materials according to claim 1, characterized in that, The silica nanoparticles have a particle size of 10~100nm.

7. A high-temperature resistant composite adhesive for amorphous materials, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 5.

8. The use of the high-temperature resistant composite adhesive for amorphous materials as described in claim 7 in the preparation of a heat-insulating and sound-absorbing protective layer.

9. A heat-insulating and sound-insulating protective layer, characterized in that, The material includes the high-temperature resistant composite binder, hollow microspheres, aerogel particles, reinforcing phase material, and additives as described in claim 7; wherein the amount of the high-temperature resistant composite binder added is 13% to 45%; and the amount of the hollow microspheres added is 3% to 10%.

10. The application of the thermal insulation and soundproofing protective layer as described in claim 9 in the protection of high-temperature pipelines and equipment.

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