Lightweight thermal insulation composite foam concrete component and method for producing same

Abstract

The present application relates to the technical field of concrete material, and particularly relates to a light thermal-insulation composite foam concrete component and a preparation method thereof, which comprises sulphoaluminate cement, modified polyethylene glycol, tripeptide linker, nano rutile titanium dioxide and nano zinc oxide; one end of the carboxyl group of the modified polyethylene glycol is combined with calcium hydroxide to form calcium carboxylate, and the other end of the carboxyl group is combined with the tripeptide linker to form an amide bond; the modified polyethylene glycol and the tripeptide linker are fixed to form a composite network with the cement matrix; after the service period ends, the trypsin specifically cuts the lysine carboxyl terminal peptide bond to realize the rapid decomposition of the foam concrete; the nano rutile titanium dioxide forms a physical barrier to reflect or scatter ultraviolet rays and protect the peptide chain; and the nano zinc oxide can capture the trace free radicals excited by the nano rutile titanium dioxide in an alkaline environment to prevent the degradation of the peptide chain under the action of the free radicals.

Description

Technical Field

[0001] This invention relates to the field of concrete materials technology, specifically to a lightweight thermal insulation composite foam concrete component and its preparation method. Background Technology

[0002] With increasingly stringent requirements for building energy conservation, lightweight insulating foamed concrete, due to its low thermal conductivity and excellent fire resistance, has become a core material for external wall insulation systems. However, traditional foamed concrete exposes serious environmental problems during building demolition: the silicate matrix is ​​non-degradable, requiring hundreds of years of natural weathering, generating a large amount of concrete waste globally each year, leading to landfill depletion of land resources; the porous structure generates a large amount of dust after crushing, resulting in significant strength loss in recycled aggregates and making recycling difficult; alkaline leachates damage soil ecology, and the migration of heavy metal ions threatens groundwater safety. Existing foamed concrete degradation technologies mainly employ physical crushing, acid hydrolysis, and microbial decomposition, but each method has fundamental drawbacks. Physical crushing consumes a lot of energy and cannot separate impurities; acid hydrolysis requires large amounts of concentrated hydrochloric acid and produces toxic chloride byproducts; microbial decomposition has a long cycle and low efficiency. Summary of the Invention

[0003] (1) Technical problems to be solved

[0004] The purpose of this invention is to provide a lightweight thermal insulation composite foam concrete component and its preparation method, enabling the foam concrete to decompose rapidly when discarded.

[0005] (2) Technical solution

[0006] To achieve the above objectives, on the one hand, the present invention provides a lightweight thermal insulation composite foam concrete component, the raw materials comprising, by weight, 100-110 parts of sulfoaluminate cement, 1.0-1.5 parts of modified polyethylene glycol, 0.2-0.5 parts of tripeptide linker, 0.4-0.6 parts of nano-rutile titanium dioxide, and 0.1-0.2 parts of nano-zinc oxide;

[0007] The modified polyethylene glycol contains carboxyl groups at both ends; the tripeptide linker is a glycine-lysine-glycine complex; and the water-cement ratio of the lightweight thermal insulation composite foam concrete component is 0.45.

[0008] Furthermore, it also includes 20 parts of lightweight aggregate, 5 parts of fiber-reinforcing agent, 4 parts of foaming agent, 0.8 parts of polycarboxylate superplasticizer, 0.2 parts of zinc borate, and 0.1 parts of wood fiber.

[0009] Furthermore, the lightweight aggregate includes expanded vitrified microspheres; the reinforcing fiber agent includes calcium carbonate whiskers; and the foaming agent includes hydrogen peroxide.

[0010] Furthermore, the preparation method of the modified polyethylene glycol includes the following steps:

[0011] S11. Linear polyethylene glycol was dehydrated in a vacuum oven and then dissolved in anhydrous toluene. Nitrogen gas was purged to obtain the initial solution.

[0012] S12. Succinic anhydride and catalyst DMAP are added to the initial solution to carry out a carboxylation reaction, and a reaction solution is obtained;

[0013] S13. After the reaction solution is cooled to room temperature, ice-cold diethyl ether is added dropwise to precipitate the precipitate. After filtration, the precipitate is washed with cold diethyl ether and dried under vacuum to obtain modified polyethylene glycol.

[0014] Furthermore, the mass ratio of the linear polyethylene glycol to anhydrous toluene is 1:8.65 to 8.72.

[0015] Furthermore, the molar ratio of the linear polyethylene glycol to succinic anhydride is 1:2.2.

[0016] Furthermore, the preparation method of the tripeptide linker includes the following steps:

[0017] S21. Place Fmoc-glycine-Wang resin in a reaction column, add N,N-dimethylformamide to swell it, then add N,N-dimethylformamide solution containing 20% ​​piperidine to remove the Fmoc protecting group, and rinse with N,N-dimethylformamide.

[0018] S22. Fmoc-lysine (Boc)-OH, activator benzotriazole-N,N,N',N'-tetramethylurea hexafluorophosphate, additive 1-hydroxybenzotriazole, and catalyst N,N-diisopropylethylamine are dissolved in N,N-dimethylformamide and then injected into the reaction column. The reaction is carried out with shaking at room temperature, washed with N,N-dimethylformamide, and then N,N-dimethylformamide solution containing 20% ​​piperidine is added to remove the Fmoc protecting group. The mixture is then washed with N,N-dimethylformamide.

[0019] S23. Fmoc-glycine-OH, activator benzotriazole-N,N,N',N'-tetramethylurea hexafluorophosphate, additive 1-hydroxybenzotriazole, and catalyst N,N-diisopropylethylamine are dissolved in N,N-dimethylformamide and then injected into the reaction column. The reaction is carried out with shaking at room temperature and washed with N,N-dimethylformamide.

[0020] S24. Inject the mixture into the reaction column, shake to react, precipitate with ice-cold diethyl ether, purify by high performance liquid chromatography on a C18 reversed-phase column with acetonitrile-water gradient elution, and freeze-dry to obtain the tripeptide linker.

[0021] Furthermore, the mixture comprises 95% trifluoroacetic acid, 2.5% deionized water, and 2.5% triisopropylsilane.

[0022] Furthermore, the molar ratio of Fmoc-glycine-Wang resin, Fmoc-lysine (Boc)-OH and Fmoc-glycine-OH is 1:3.3-3.5:3.3-3.5.

[0023] Based on the same inventive concept, in a second aspect, the present invention also provides a method for preparing a lightweight thermal insulation composite foam concrete component, applicable to the preparation of the aforementioned lightweight thermal insulation composite foam concrete component, the preparation method comprising:

[0024] S31. Dissolve the modified polyethylene glycol in water, add the tripeptide linker and stir until completely dissolved to obtain a transparent viscous liquid;

[0025] S32. After ball milling nano-rutile titanium dioxide, nano-zinc oxide and KH-550, add water, then add polycarboxylate superplasticizer, and ultrasonically disperse to obtain a dispersion.

[0026] S33. Dry mix sulfoaluminate cement, calcium carbonate whiskers, and zinc borate, then add expanded vitrified microspheres and wood fibers and stir at low speed to obtain a premixed dry material;

[0027] S34. Pour the dispersion liquid into the premixed dry material, stir, then add the transparent viscous liquid, stir again, add hydrogen peroxide and water, and immediately stir at high speed to obtain a lightweight thermal insulation composite foam concrete.

[0028] During service, one end of the modified polyethylene glycol (PEG) reacts with the cement hydration product Ca(OH)₂ to form calcium carboxylate, anchoring the cement matrix; the other end of the PEG reacts with the amino group of the lysine side chain in the tripeptide linker to form an amide bond. Through the calcium carboxylate and amide bond, the modified PEG and tripeptide linker form a composite network with the cement matrix and are thus fixed. After the service life ends, trypsin specifically cleaves the peptide bond at the lysine carboxyl end, causing the peptide bond to break and the network to collapse. The modified PEG dissolves, the cement particles disperse, and finally, the PEG completely decomposes into a CaCO₃ / PEG / amino acid mixed slurry, achieving rapid decomposition of foamed concrete. The resulting slurry can be directly used as plant nutrient soil or raw material for non-fired bricks.

[0029] Ultraviolet (UV) radiation can cause peptide chains in tripeptide linkers to break down. Nano-rutile titanium dioxide, with a refractive index far exceeding that of cement, can form a physical barrier, reflecting or scattering UV radiation and protecting the peptide chains. Nano-zinc oxide can capture trace amounts of free radicals generated by nano-rutile titanium dioxide under alkaline conditions, preventing the peptide chains from degrading under the influence of free radicals.

[0030] (3) Beneficial effects

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. In this invention, one end of the modified polyethylene glycol (PEG) reacts with the cement hydration product Ca(OH)₂ to form a calcium carboxylate, anchoring the cement matrix; the other end of the PEG reacts with the amino group of the lysine side chain in the tripeptide linker to form an amide bond. Through the calcium carboxylate and the amide bond, the modified PEG and the tripeptide linker form a composite network with the cement matrix and are thus fixed. After the service life ends, trypsin specifically cleaves the peptide bond at the lysine carboxyl end, causing the peptide bond to break and the network to collapse. This leads to the dissolution of the modified PEG, dispersion of cement particles, and rapid decomposition of the foamed concrete.

[0033] 2. This invention utilizes nano-rutile titanium dioxide to form a physical barrier, reflecting or scattering ultraviolet light to protect the peptide chain. Nano-zinc oxide can capture trace free radicals excited by nano-rutile titanium dioxide in an alkaline environment, preventing the peptide chain from degrading under the action of free radicals. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the preparation process of a lightweight thermal insulation composite foam concrete. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0036] Example 1

[0037] This embodiment discloses a lightweight thermal insulation composite foam concrete component, the raw materials of which include 102 parts by weight of sulfoaluminate cement, 1.2 parts of modified polyethylene glycol, 0.3 parts of tripeptide linker, 0.45 parts of nano-rutile titanium dioxide, and 0.15 parts of nano-zinc oxide.

[0038] The modified polyethylene glycol contains carboxyl groups at both ends; the tripeptide linker is a glycine-lysine-glycine complex; and the water-cement ratio of the lightweight thermal insulation composite foam concrete component is 0.45.

[0039] It also includes 20 parts of lightweight aggregate, 5 parts of fiber-reinforcing agent, 4 parts of foaming agent, 0.8 parts of polycarboxylate superplasticizer, 0.2 parts of zinc borate, and 0.1 parts of wood fiber.

[0040] The lightweight aggregate includes expanded vitrified microspheres; the reinforcing fiber agent includes calcium carbonate whiskers; and the foaming agent includes hydrogen peroxide.

[0041] The method for preparing the modified polyethylene glycol includes the following steps:

[0042] S11. Linear polyethylene glycol was dehydrated in a vacuum oven at 60°C for 24 hours and then dissolved in anhydrous toluene under nitrogen protection to obtain the initial solution.

[0043] S12. Succinic anhydride and catalyst DMAP were added to the initial solution to carry out the carboxylation reaction. The mixture was refluxed at 110°C for 12 h to obtain the reaction solution.

[0044] S13. After the reaction solution is cooled to room temperature, ice-cold ether is added dropwise to precipitate the precipitate. After filtration, the precipitate is washed three times with cold ether and dried under vacuum at 40°C to obtain modified polyethylene glycol.

[0045] The mass ratio of linear polyethylene glycol to anhydrous toluene is 1:8.65 to 8.72.

[0046] The molar ratio of linear polyethylene glycol to succinic anhydride is 1:2.2.

[0047] The preparation method of the tripeptide linker includes the following steps:

[0048] S21. Place Fmoc-glycine-Wang resin in a reaction column, add N,N-dimethylformamide, swell for 30 minutes, then add N,N-dimethylformamide solution containing 20% ​​piperidine to remove Fmoc protecting groups, and then rinse 6 times with N,N-dimethylformamide.

[0049] S22. Fmoc-lysine (Boc)-OH, activator benzotriazole-N,N,N',N'-tetramethylurea hexafluorophosphate, additive 1-hydroxybenzotriazole, and catalyst N,N-diisopropylethylamine were dissolved in N,N-dimethylformamide and then injected into the reaction column. The reaction was carried out at room temperature with shaking for 1 hour. After completion, the mixture was washed with N,N-dimethylformamide, and then N,N-dimethylformamide solution containing 20% ​​piperidine was added to remove the Fmoc protecting group. The mixture was then washed with N,N-dimethylformamide 6 times.

[0050] S23. Fmoc-glycine-OH, activator benzotriazole-N,N,N',N'-tetramethylurea hexafluorophosphate, additive 1-hydroxybenzotriazole, and catalyst N,N-diisopropylethylamine were dissolved in N,N-dimethylformamide and then injected into the reaction column. The reaction was carried out at room temperature with shaking for 1 hour. After completion, the mixture was washed with N,N-dimethylformamide.

[0051] S24. Inject the mixture into the reaction column, shake and react for 2 hours, precipitate with ice-cold diethyl ether, purify by high performance liquid chromatography on a C18 reversed-phase column with acetonitrile-water gradient elution, and freeze-dry to obtain the tripeptide linker.

[0052] The mixture comprises 95% trifluoroacetic acid, 2.5% deionized water, and 2.5% triisopropylsilane.

[0053] The molar ratio of Fmoc-glycine-Wang resin, Fmoc-lysine (Boc)-OH and Fmoc-glycine-OH is 1:3.30:3.30.

[0054] Based on the same inventive concept, in a second aspect, the present invention also provides a method for preparing a lightweight thermal insulation composite foam concrete component, applicable to the preparation of the aforementioned lightweight thermal insulation composite foam concrete component, the preparation method comprising:

[0055] S31. Dissolve modified polyethylene glycol in deionized water at 40℃ (water with a water-to-glue ratio of 30%), add tripeptide linker and stir until completely dissolved to obtain a transparent viscous liquid;

[0056] S32. Nano-rutile titanium dioxide and nano-zinc oxide are ball-milled with KH-550 for 30 min to obtain a UV shielding agent. The agent is then added to deionized water (water with a water-cement ratio of 50%), followed by the addition of polycarboxylate superplasticizer. The mixture is then ultrasonically dispersed to obtain a dispersion.

[0057] S33. Dry mix sulfoaluminate cement, calcium carbonate whiskers, and zinc borate for 2 minutes, then add expanded vitrified microspheres and wood fibers and stir at low speed for 1 minute to obtain a premixed dry material;

[0058] S34. Pour the dispersion into the premixed dry material, stir at medium speed (300 rpm) for 1 min, add the transparent viscous liquid, stir for 30 s, add hydrogen peroxide and deionized water (water-cement ratio 20%), and immediately stir at high speed to obtain a lightweight thermal insulation composite foam concrete. The preparation process is as follows: Figure 1 As shown.

[0059] Example 2

[0060] This embodiment discloses a lightweight thermal insulation composite foam concrete component, the raw materials of which include 100 parts by weight of sulfoaluminate cement, 1.0 part of modified polyethylene glycol, 0.2 parts of tripeptide linker, 0.4 parts of nano-rutile titanium dioxide, and 0.1 parts of nano-zinc oxide;

[0061] The modified polyethylene glycol contains carboxyl groups at both ends; the tripeptide linker is a glycine-lysine-glycine complex; and the water-cement ratio of the lightweight thermal insulation composite foam concrete component is 0.45.

[0062] The preparation methods of the modified polyethylene glycol and tripeptide linker in this embodiment are the same as those in Example 1. The preparation method of the lightweight thermal insulation composite foam concrete in this embodiment is also the same as that in Example 1.

[0063] Example 3

[0064] This embodiment discloses a lightweight thermal insulation composite foam concrete component, the raw materials of which include 110 parts by weight of sulfoaluminate cement, 1.5 parts of modified polyethylene glycol, 0.5 parts of tripeptide linker, 0.6 parts of nano-rutile titanium dioxide, and 0.2 parts of nano-zinc oxide.

[0065] The modified polyethylene glycol contains carboxyl groups at both ends; the tripeptide linker is a glycine-lysine-glycine complex; and the water-cement ratio of the lightweight thermal insulation composite foam concrete component is 0.45.

[0066] The preparation methods of the modified polyethylene glycol and tripeptide linker in this embodiment are the same as those in Example 1. The preparation method of the lightweight thermal insulation composite foam concrete in this embodiment is also the same as that in Example 1.

[0067] Example 4

[0068] This embodiment discloses a lightweight thermal insulation composite foam concrete component, the raw materials of which include 105 parts by weight of sulfoaluminate cement, 1.25 parts of modified polyethylene glycol, 0.35 parts of tripeptide linker, 0.5 parts of nano-rutile titanium dioxide, and 0.15 parts of nano-zinc oxide.

[0069] The modified polyethylene glycol contains carboxyl groups at both ends; the tripeptide linker is a glycine-lysine-glycine complex; and the water-cement ratio of the lightweight thermal insulation composite foam concrete component is 0.45.

[0070] The preparation methods of the modified polyethylene glycol and tripeptide linker in this embodiment are the same as those in Example 1. The preparation method of the lightweight thermal insulation composite foam concrete in this embodiment is also the same as that in Example 1.

[0071] Examples 5-12

[0072] Examples 5-12 each provide a lightweight thermal insulation composite foam concrete component. The difference between the above examples and Example 1 is that the molar ratios of Fmoc-glycine-Wang resin, Fmoc-lysine (Boc)-OH, and Fmoc-glycine-OH are different, as shown in Table 1. The remaining formulations and preparation methods are the same as in Example 1.

[0073] Comparative Examples 1-8

[0074] Comparative Examples 1-8 each provide a lightweight thermal insulation composite foam concrete component. The difference between these comparative examples and Example 1 lies in the molar ratios of Fmoc-glycine-Wang resin, Fmoc-lysine (Boc)-OH, and Fmoc-glycine-OH, as shown in Table 1. The remaining formulations and preparation methods are the same as in Example 1.

[0075] Table 1. Addition of raw materials for the preparation of tripeptide linkers in the examples and comparative examples.

[0076]

[0077] Comparative Example 9

[0078] Based on Example 1, but unlike Example 1, this comparative example does not include modified polyethylene glycol.

[0079] Comparative Example 10

[0080] Based on Example 1, but unlike Example 1, this comparative example does not include a tripeptide linker.

[0081] Comparative Example 11

[0082] Based on Example 1, the difference from Example 1 is that this comparative example uses polyethylene glycol without carboxyl groups at both ends instead of modified polyethylene glycol.

[0083] Comparative Example 12

[0084] Based on Example 1, but unlike Example 1, this comparative example does not include modified polyethylene glycol and tripeptide linker.

[0085] Comparative Example 13

[0086] Based on Example 1, but unlike Example 1, this comparative example does not include nano zinc oxide.

[0087] Comparative Example 14

[0088] Based on Example 1, but unlike Example 1, this comparative example does not include nano-rutile titanium dioxide.

[0089] Comparative Example 15

[0090] Based on Example 1, but unlike Example 1, this comparative example does not include nano-rutile titanium dioxide and nano-zinc oxide.

[0091] Experimental Example 1

[0092] The lightweight thermal insulation composite foam concrete obtained in Examples 1-12 and Comparative Examples 1-12 was crushed and then enzymatically hydrolyzed with 0.1% trypsin (pH=8.0, 40℃). Samples were taken at 4h, 24h and 72h to measure the concrete decomposition rate; the results are shown in Table 2.

[0093] Table 2 Concrete Decomposition Rate Detection

[0094]

[0095]

[0096] Based on the results in Table 2, compared with Comparative Examples 1-8, Examples 1 and 5-12 show that the optimal molar ratio of Fmoc-glycine-Wang resin, Fmoc-lysine (Boc)-OH, and Fmoc-glycine-OH, considering both effect and cost, is 1:3.4:3.4. The tripeptide linker prepared with this molar ratio exhibits better enzyme response when combined with modified polyethylene glycol, resulting in rapid decomposition of the foamed concrete. Compared with Comparative Example 12, Example 1 shows that without modified polyethylene glycol and the tripeptide linker, the foamed concrete cannot respond to enzymes and decompose. Compared with Comparative Examples 9 and 11, Example 1, without modified polyethylene glycol, although the foamed concrete is enzymatically hydrolyzed, has a lower decomposition rate. Compared with Comparative Example 10, Example 1, without the tripeptide linker, although the foamed concrete can be decomposed by modified polyethylene glycol, has a low decomposition rate.

[0097] Experimental Example 2

[0098] UV shielding test: The lightweight thermal insulation composite foam concrete obtained in Examples 1-4 and Comparative Examples 13-15 was cut into 40×40×40mm pieces. 3 The test blocks were irradiated with a UVB-313 lamp for 200 hours at a constant temperature of 40℃ and humidity of 50%, and the peptide bond cleavage rate and active free radical concentration were measured; the results are shown in Table 3.

[0099] Table 3 UV shielding test

[0100]

[0101]

[0102] According to the results in Table 3, in Examples 1-4, nano-rutile titanium dioxide forms a physical barrier, reflecting or scattering ultraviolet light and protecting the peptide chain; nano-zinc oxide can capture trace free radicals excited by nano-rutile titanium dioxide in an alkaline environment, preventing the peptide chain from degrading under the action of free radicals. Comparing Example 1 with Comparative Example 15, it can be seen that without nano-rutile titanium dioxide and nano-zinc oxide, the peptide chain is easily broken; comparing Example 1 with Comparative Examples 13 and 14, it can be seen that the protection of the peptide chain by nano-rutile titanium dioxide or nano-zinc oxide alone is limited.

[0103] Finally, it should be noted that although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight thermal insulation composite foam concrete component, characterized in that, The raw materials, by weight, include 100-110 parts of sulfoaluminate cement, 1.0-1.5 parts of modified polyethylene glycol, 0.2-0.5 parts of tripeptide linker, 0.4-0.6 parts of nano-rutile titanium dioxide, and 0.1-0.2 parts of nano-zinc oxide. The modified polyethylene glycol contains carboxyl groups at both ends; the tripeptide linker is a glycine-lysine-glycine complex; and the water-cement ratio of the lightweight thermal insulation composite foam concrete component is 0.

45. The preparation method of the tripeptide linker includes the following steps: S21. Place the Fmoc-glycine-Wang resin in a reaction column, add N,N-dimethylformamide to swell it, then add an N,N-dimethylformamide solution containing 20% ​​piperidine to remove the Fmoc protecting group, and rinse with N,N-dimethylformamide. S22. Fmoc-lysine (Boc)-OH, activator benzotriazole-N,N,N',N'-tetramethylurea hexafluorophosphate, additive 1-hydroxybenzotriazole, and catalyst N,N-diisopropylethylamine were dissolved in N,N-dimethylformamide and then injected into the reaction column. The reaction was carried out with shaking at room temperature, washed with N,N-dimethylformamide, and then N,N-dimethylformamide solution containing 20% ​​piperidine was added to remove the Fmoc protecting group. The mixture was then washed with N,N-dimethylformamide. S23. Fmoc-glycine-OH, activator benzotriazole-N,N,N',N'-tetramethylurea hexafluorophosphate, additive 1-hydroxybenzotriazole, and catalyst N,N-diisopropylethylamine are dissolved in N,N-dimethylformamide and then injected into the reaction column. The reaction is carried out with shaking at room temperature and washed with N,N-dimethylformamide. S24. Inject the mixture into the reaction column, shake to react, precipitate with ice-cold diethyl ether, purify by high performance liquid chromatography on a C18 reversed-phase column with acetonitrile-water gradient elution, and freeze-dry to obtain the tripeptide linker.

2. The lightweight thermal insulation composite foam concrete component according to claim 1, characterized in that, It also includes 20 parts of lightweight aggregate, 5 parts of fiber-reinforcing agent, 4 parts of foaming agent, 0.8 parts of polycarboxylate superplasticizer, 0.2 parts of zinc borate, and 0.1 parts of wood fiber; The reinforcing fiber agent includes calcium carbonate whiskers.

3. The lightweight thermal insulation composite foam concrete component according to claim 2, characterized in that, The lightweight aggregate includes expanded vitrified microspheres; the foaming agent includes hydrogen peroxide.

4. A lightweight thermal insulation composite foam concrete component according to claim 1, characterized in that, The method for preparing the modified polyethylene glycol includes the following steps: S11. Linear polyethylene glycol was dehydrated in a vacuum oven and then dissolved in anhydrous toluene. Nitrogen gas was purged to obtain the initial solution. S12. Succinic anhydride and catalyst DMAP are added to the initial solution to carry out a carboxylation reaction, and a reaction solution is obtained; S13. After the reaction solution is cooled to room temperature, ice-cold diethyl ether is added dropwise to precipitate the precipitate. After filtration, the precipitate is washed with cold diethyl ether and dried under vacuum to obtain modified polyethylene glycol.

5. A lightweight thermal insulation composite foam concrete component according to claim 4, characterized in that, The mass ratio of linear polyethylene glycol to anhydrous toluene is 1:8.65~8.

72.

6. A lightweight thermal insulation composite foam concrete component according to claim 4, characterized in that, The molar ratio of linear polyethylene glycol to succinic anhydride is 1:2.

2.

7. A lightweight thermal insulation composite foam concrete component according to claim 1, characterized in that, The mixture comprises 95% trifluoroacetic acid, 2.5% deionized water, and 2.5% triisopropylsilane.

8. A lightweight thermal insulation composite foam concrete component according to claim 1, characterized in that, The molar ratio of Fmoc-glycine-Wang resin, Fmoc-lysine (Boc)-OH and Fmoc-glycine-OH is 1:3.3~3.5:3.3~3.

5.

9. A method for preparing a lightweight thermal insulation composite foam concrete component, applied to the preparation of the lightweight thermal insulation composite foam concrete component as described in any one of claims 1 to 8, characterized in that, The preparation method includes: S31. Dissolve the modified polyethylene glycol in water, add the tripeptide linker and stir until completely dissolved to obtain a transparent viscous liquid; S32. After ball milling nano-rutile titanium dioxide, nano-zinc oxide and KH-550, add water, then add polycarboxylate superplasticizer, and ultrasonically disperse to obtain a dispersion. S33. Dry mix sulfoaluminate cement, calcium carbonate whiskers, and zinc borate, then add expanded vitrified microspheres and wood fibers and stir at low speed to obtain a premixed dry material; S34. Pour the dispersion liquid into the premixed dry material, stir, then add the transparent viscous liquid, stir again, add hydrogen peroxide and water, and immediately stir at high speed to obtain a lightweight thermal insulation composite foam concrete.

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