A thermal insulation coating structure and a preparation method thereof

Abstract

The application relates to the field of energy-saving coatings, and particularly discloses a heat-preservation and heat-insulation coating structure and a preparation method thereof. The heat-preservation and heat-insulation coating structure comprises a heat-preservation layer and a functional layer, the coating structure has good heat-preservation and heat-insulation effects, excellent waterproof performance, and a long service life.

Description

Technical Field

[0001] This application relates to the field of energy-saving coatings, and more specifically, it relates to a thermal insulation coating structure and its preparation method. Background Technology

[0002] Energy issues are a serious obstacle to human progress, with building energy consumption accounting for 30-40%, and this proportion is increasing daily with the rapid development of my country's construction industry. Heating and air conditioning account for approximately 55% of total building energy consumption; therefore, researching and developing building insulation coatings has significant economic, environmental, and social benefits.

[0003] Currently, most building insulation coatings primarily utilize components such as foamed plastics, expanded perlite, and hollow microspheres for insulation. These materials, through the pores within the particles and the gaps between them, prevent heat transfer and radiative heat dissipation, achieving a certain level of insulation. However, with increasing national requirements for building energy conservation, these materials alone are clearly insufficient. For example, one related technology involves a thermal insulation coating composed of water, cellulose, dispersant, SPA202 defoamer, wetting agent, multifunctional additives, propylene glycol, titanium dioxide, diatomaceous earth, hollow glass microspheres, elastic waterproof emulsion, F111 defoamer, thickener, and preservatives and bactericides. Thermal insulation performance tests on this coating showed that its insulation temperature difference was only 12-16.7℃. This indicates that there is still significant room for improvement in the coating's thermal insulation performance. Summary of the Invention

[0004] In order to improve the thermal insulation effect of coatings, this application provides a thermal insulation coating structure and its preparation method.

[0005] In a first aspect, this application provides a thermal insulation coating structure, which includes a thermal insulation layer and a functional layer;

[0006] The insulation layer is formed by curing an insulation coating, which, by weight, comprises the following raw materials:

[0007] 20-35 parts of polysiloxane prepolymer;

[0008] 5-10 parts of self-crosslinking acrylic acid;

[0009] 4-6 parts of organosilicon-modified hollow microspheres;

[0010] 3-5 parts of organosilicon-modified waste rubber powder;

[0011] The organosilicon is an organosilicon compound with 6 or more carbon atoms, preferably any one of octyltriethoxysilane, octyltrimethoxysilane, and tetradecyloxysilane;

[0012] The functional layer is formed by curing a functional coating, which, by weight, comprises the following raw materials:

[0013] 60-80 parts of water-based acrylic resin;

[0014] 20-30 parts of thermal insulation filler;

[0015] 10-15 parts of cyanamide compounds;

[0016] 20-30 parts of the compound represented by general formula (Ⅰ);

[0017]

[0018] In general formula (Ⅰ), there is no particular restriction on the value of n. From the perspective of the cross-linking effect and waterproof effect of the functional layer and the insulation layer, the larger the n is, the more beneficial it is to achieve the above effects. It is preferred that n is an integer from 5 to 80, such as 10, 15, 20, 30, 40, 50, 60, 70.

[0019] R1, R2, and R3 are each independently selected from hydrogen atoms, straight-chain or branched hydrocarbon groups from C1 to C6, and their derivatives.

[0020] In this invention, the polysiloxane prepolymer is prepared from nano-silica sol, oxysilane, and silane end-capping agent.

[0021] Preferably, in the polysiloxane prepolymer, the mass ratio of nano-silica sol, oxysilane and silane end-capping agent is 1:(0.8-1.2):(0.2-0.5), and a more preferred mass ratio is 1:1:0.35.

[0022] Preferably, the oxysilane is selected from one or more of methyltrimethoxysilane, methyltriethoxysilane, tetraethyl orthosilicate, methacryloxypropyltrimethoxysilane, phenyltrimethoxysilane, n-propyltrimethoxysilane, and vinyltrimethoxysilane.

[0023] More preferably, the oxysilane is selected from two or more mixtures of methyltrimethoxysilane, methyltriethoxysilane, tetraethyl orthosilicate, methacryloxypropyltrimethoxysilane, phenyltrimethoxysilane, n-propyltrimethoxysilane, and vinyltrimethoxysilane.

[0024] The silane end-capping agent is selected from any one of tetramethyldisiloxane, N-(n-butyl)-3-aminopropyltrimethoxysilane, anilinemethyltrimethoxysilane, and anilinemethylmethyldimethoxysilane.

[0025] In one specific embodiment, the polysiloxane prepolymer is prepared by the following method: mixing nano-silica sol, oxysilane and silane end-capping agent, controlling the temperature at 45-55℃ and the rotation speed at 30-35 rpm, and performing a prepolymerization reaction for 2-4 hours to obtain a polysiloxane prepolymer with a molecular weight of 60,000-80,000.

[0026] In this invention, the preparation method of the organosilicon-modified hollow microspheres is as follows: hollow microspheres are mixed with organosilicon compounds with 6 or more carbon atoms, methanol and ammonia are added, the mixture is ultrasonically treated and centrifuged, the supernatant is discarded, the precipitate is washed with methanol, the precipitate is added to sodium silicate solution for reaction, and after the reaction is completed, it is washed with methanol to obtain organosilicon-modified hollow microspheres.

[0027] Preferably, the mass ratio of hollow microspheres to organosilicon compounds with 6 or more carbon atoms is 1:(4-6).

[0028] Further preferably, the mass ratio of hollow microspheres to organosilicon compounds with 6 or more carbon atoms is 1:5.

[0029] Preferably, when adding methanol and ammonia, the ratio of organosilicon compound with 6 or more carbon atoms to methanol to ammonia is 1:(5-6):(1-1.2).

[0030] Preferably, the mass fraction of ammonia water is 20-30%.

[0031] Preferably, the amount of sodium silicate solution used is based on the ratio of organosilicon compounds with 6 or more carbon atoms to sodium silicate solution of 1:(0.15-0.2).

[0032] Preferably, the sodium silicate solution has a mass fraction of 10-20%.

[0033] As a preferred embodiment, the preparation method of the organosilicon modified waste rubber powder is as follows: the waste rubber powder is pretreated by immersing it in an alkaline solution, then taken out and washed, and then immersed in an organosilicon compound with 6 or more carbon atoms, and methanol is added. After ultrasonic treatment, the mixture is centrifuged, the supernatant is discarded, and the precipitate is washed to obtain organosilicon modified waste rubber powder.

[0034] Preferably, the mass ratio of waste rubber powder to organosilicon compounds with 6 or more carbon atoms is 1:(6-8), and more preferably, the mass ratio is 1:7.

[0035] Preferably, the alkaline solution is a sodium hydroxide solution with a mass fraction of 10%.

[0036] Preferably, the mass ratio of waste rubber powder to alkaline solution is 1:(5-10).

[0037] As a preferred option, the raw materials for thermal insulation coatings and functional coatings may also include additives conventional in the art, such as leveling agents, preservatives, dispersants, coupling agents, mildew inhibitors, defoamers, thixotropic agents, and antisettling agents.

[0038] In this invention, the waterborne acrylic resin in the functional layer is selected from Joncryl@678, 6292, Vinofan W 3109ap or one or more; the heat insulation filler is selected from hollow glass microspheres, rutile titanium dioxide or one or two; the cyanamide compound is selected from melamine.

[0039] Secondly, this application provides a method for preparing a thermal insulation coating structure, comprising the following steps:

[0040] S1, respectively prepare thermal insulation coating and functional coating;

[0041] S2, apply the thermal insulation coating to the surface of the object to be covered, let it cure, and form a thermal insulation layer;

[0042] S3 involves applying the functional coating to the surface of the insulation layer and allowing it to cure, thus forming a functional coating layer.

[0043] The preparation method of the thermal insulation coating is as follows: mixing polysiloxane prepolymer, self-crosslinking acrylic acid, organosilicon modified hollow microspheres, and organosilicon modified waste adhesive powder to obtain the thermal insulation coating;

[0044] The functional coating is prepared by mixing water-based acrylic resin, heat-insulating filler, cyanamide compound, and compound represented by general formula (Ⅰ) to obtain the functional coating.

[0045] The curing temperature of the thermal insulation coating can be at room temperature, and the curing time is about one hour.

[0046] The curing temperature of the functional coating can be room temperature, and the curing time is about one hour.

[0047] In summary, this application has at least the following beneficial effects:

[0048] The thermal insulation coating of this application consists of a double-layer structure. The inner layer is a thermal insulation layer, which mainly serves to provide thermal insulation and waterproofing. The outer layer is a functional layer, which mainly serves to provide waterproofing, thermal insulation, and protection. The two layers work together to provide a good thermal insulation and waterproofing effect for the coating structure.

[0049] The thermal insulation coating has an organic-inorganic hybrid structure, which has a silicon dioxide core and a carbon chain shell, and combines rigidity and toughness, greatly improving the various properties of the coating structure.

[0050] Both hollow microspheres and waste adhesive powder in thermal insulation coatings have thermal insulation effects, and the two can also produce a significant synergistic promoting effect. In the coating system, waste adhesive powder and hollow microspheres have a significant particle size difference with other raw materials, which can fully fill the three-dimensional network structure formed by organic-inorganic hybrid structure, further improving the stability and strength of the coating system, making it possible to improve the thermal insulation effect.

[0051] Waste adhesive powder is a waste product from the construction industry. It is widely available and inexpensive, and it enables the reuse of waste resources, which is conducive to energy conservation and environmental protection.

[0052] After surface grafting modification of hollow microspheres and waste adhesive powder with organosilicon compounds with long carbon chain structures, the cross-linking strength between hollow microspheres and waste adhesive powder and organic-inorganic hybrid structures is further enhanced. In addition, the hydrophobicity of hollow microspheres and waste adhesive powder is greatly improved through modification, thereby improving the water resistance of the coating structure and effectively reducing the occurrence of partial or complete loss of coating structure performance due to water penetration.

[0053] The cyanamide compounds in functional coatings are substances that have both cyano and amino groups. They have high reactivity. Their active amino groups can react with the acyl chloride groups in the general formula (I) compound to generate amide groups. The hydrogen bonding ability and polarity of the amide groups are extremely strong. Hydrogen bonds are easily formed between adjacent amide groups, which helps to enhance the stability and strength of the molecular structure, making the molecular chain less prone to breakage, and thus helping to improve the hardness and durability of the coating structure.

[0054] The long carbon chain structure in the compound of general formula (I) can also improve the waterproof performance of the coating structure, making the coating less susceptible to water erosion, and further ensuring the thermal insulation effect of the functional layer and the insulation layer. Detailed Implementation

[0055] The present application will be further described in detail below with reference to the embodiments.

[0056] Raw materials and sources:

[0057] Self-crosslinking acrylic acid is sourced from BASF, model Joncryl@8330;

[0058] Acrylic block copolymer, acid value 15 mgKOH / g, sourced from Evonik Group;

[0059] The silicone defoamer is sourced from Bavo, model BWF-WB880;

[0060] Rutile titanium dioxide is sourced from Huijing Sub-Nano New Materials, with a particle size of 30nm.

[0061] The waterborne acrylic resin is sourced from BASF, model Vinofan W 3109ap;

[0062] The hollow glass microspheres were sourced from Yilei Mining in Hebei Province, with a mesh size of 1250.

[0063] Preparation Example

[0064] Preparation Example 1

[0065] The preparation steps of an organosilicon-modified hollow microsphere are as follows: 10 kg of hollow microspheres (hollow glass microspheres, sourced from Zhongke Huaxing, model C20) are mixed with 40 kg of organosilicon compound (octyltriethoxysilane) with 6 or more carbon atoms. 200 kg of methanol and 40 kg of ammonia water (mass fraction 25%) are added. After ultrasonic treatment for 2 h, the mixture is centrifuged, the supernatant is discarded, and the precipitate is washed three times with methanol. The precipitate is then added to 6 kg of sodium silicate solution (mass fraction 10%) for reaction. After the reaction is completed, the mixture is washed with methanol to obtain organosilicon-modified hollow microsphere-1.

[0066] Preparation Example 2

[0067] A type of organosilicon-modified hollow microsphere is prepared by the following steps: 10 kg of hollow microspheres (hollow glass microspheres, sourced from Zhongke Huaxing, model C20) are mixed with 50 kg of organosilicon compound (octyltriethoxysilane) with 6 or more carbon atoms. 250 kg of methanol and 50 kg of ammonia (mass fraction 25%) are added. After ultrasonic treatment for 2 h, the mixture is centrifuged, the supernatant is discarded, and the precipitate is washed three times with methanol. The precipitate is then added to 7.5 kg of sodium silicate solution (mass fraction 10%) for reaction. After the reaction is completed, the mixture is washed with methanol to obtain organosilicon-modified hollow microsphere-2.

[0068] Preparation Example 3

[0069] The preparation steps of an organosilicon-modified hollow microsphere are as follows: 10 kg of hollow microspheres (hollow glass microspheres, sourced from Zhongke Huaxing, model C20) are mixed with 60 kg of organosilicon compound (octyltriethoxysilane) with 6 or more carbon atoms. 300 kg of methanol and 60 kg of ammonia water (mass fraction 25%) are added. After ultrasonic treatment for 2 h, the mixture is centrifuged, the supernatant is discarded, and the precipitate is washed three times with methanol. The precipitate is then added to 9 kg of sodium silicate solution (mass fraction 10%) for reaction. After the reaction is completed, the mixture is washed with methanol to obtain organosilicon-modified hollow microsphere-3.

[0070] Preparation Example 4

[0071] A type of organosilicon-modified waste rubber powder is prepared by the following steps: 10 kg of waste rubber powder is pretreated by immersing it in 50 kg of alkaline solution (10% sodium hydroxide solution by mass), then washed and immersed in 60 kg of organosilicon compound with 6 or more carbon atoms, and 20 kg of methanol is added. After ultrasonic treatment, the powder is centrifuged, the supernatant is discarded, and the precipitate is washed with methanol to obtain organosilicon-modified waste rubber powder-1.

[0072] Preparation Example 5

[0073] A type of organosilicon-modified waste rubber powder is prepared by the following steps: 10 kg of waste rubber powder is pretreated by immersing it in 50 kg of alkaline solution (10% sodium hydroxide solution by mass), then washed and immersed in 70 kg of organosilicon compound with 6 or more carbon atoms, and 20 kg of methanol is added. After ultrasonic treatment, the powder is centrifuged, the supernatant is discarded, and the precipitate is washed with methanol to obtain organosilicon-modified waste rubber powder-2.

[0074] Preparation Example 6

[0075] A type of organosilicon-modified waste rubber powder is prepared by the following steps: 10 kg of waste rubber powder is pretreated by immersing it in 50 kg of alkaline solution (10% sodium hydroxide solution by mass), then washed and immersed in 80 kg of organosilicon compound with 6 or more carbon atoms, and 20 kg of methanol is added. After ultrasonic treatment, the powder is centrifuged, the supernatant is discarded, and the precipitate is washed with methanol to obtain organosilicon-modified waste rubber powder-3.

[0076] Example

[0077] Examples 1-3

[0078] A thermal insulation coating structure includes an insulation layer and a functional layer, wherein the insulation layer is formed by curing an insulation coating and the functional layer is formed by curing a functional coating.

[0079] The components of the thermal insulation coating and their corresponding weight parts are shown in the table below:

[0080]

[0081] The polysiloxane prepolymer is prepared by nano silica sol, oxysilane and silane end-capping agent in a weight ratio of 1:0.8:0.2. The preparation method is as follows: 10 kg of nano silica sol (20 nm), 8 kg of oxysilane (methyltrimethoxysilane and tetraethyl orthosilicate mixed in a weight ratio of 1:1) and 2 kg of silane end-capping agent (tetramethyldisiloxane) are mixed, the temperature is controlled at 45℃ and the rotation speed is 30 rpm, and the prepolymerization reaction is carried out for 2 hours to obtain a polysiloxane prepolymer with a molecular weight of 60,000-80,000.

[0082] The dispersant is an acrylic block copolymer; the defoamer is an organosilicon defoamer; the filler is rutile titanium dioxide; and the solvent is water.

[0083] The components of functional coatings and their corresponding weight parts are shown in the table below:

[0084]

[0085]

[0086] The heat insulation filler is composed of hollow glass microspheres and rutile titanium dioxide mixed in a weight ratio of 1:1; melamine is selected as the cyanamide compound; the compound represented by general formula (Ⅰ) is lauroyl chloride; the coupling agent is silane coupling agent KH-550; the defoamer is organosilicon defoamer, model BWF-WB880.

[0087] The preparation method of this thermal insulation coating structure is as follows:

[0088] S1, the raw materials of thermal insulation coating and functional coating are mixed and stirred separately to obtain thermal insulation coating and functional coating;

[0089] S2, apply the thermal insulation coating to the surface of the object to be covered, let it cure, and form a thermal insulation layer;

[0090] S3. Apply the functional coating to the surface of the insulation layer and cure it to form a functional coating layer.

[0091] Example 4

[0092] A thermal insulation coating structure differs from Example 2 in that the preparation method of the polysiloxane prepolymer is different. In this example, the polysiloxane prepolymer is prepared by nano silica sol, oxysilane and silane end-capping agent in a weight ratio of 1:1:0.35. The preparation method is as follows: 10 kg of nano silica sol (20 nm), 10 kg of oxysilane (methyltrimethoxysilane and tetraethyl orthosilicate mixed in a weight ratio of 1:1) and 3.5 kg of silane end-capping agent (tetramethyldisiloxane) are mixed, the temperature is controlled at 45 °C and the rotation speed is 30 rpm, and the prepolymerization reaction is carried out for 2 hours to obtain a polysiloxane prepolymer with a molecular weight of 60,000-80,000.

[0093] Example 5

[0094] A thermal insulation coating structure differs from Example 2 in that the preparation method of the polysiloxane prepolymer is different. In this example, the polysiloxane prepolymer is prepared by nano silica sol, oxysilane and silane end-capping agent in a weight ratio of 1:1.2:0.5. The preparation method is as follows: 10 kg of nano silica sol (20 nm), 12 kg of oxysilane (methyltrimethoxysilane and tetraethyl orthosilicate mixed in a weight ratio of 1:1) and 5 kg of silane end-capping agent (tetramethyldisiloxane) are mixed, the temperature is controlled at 45 °C and the rotation speed is 30 rpm, and the prepolymerization reaction is carried out for 2 hours to obtain a polysiloxane prepolymer with a molecular weight of 60,000-80,000.

[0095] Example 6

[0096] A thermal insulation coating structure, which differs from Example 4 in that the organosilicon-modified hollow microspheres are prepared in Preparation Example 2.

[0097] Example 7

[0098] A thermal insulation coating structure differs from Example 4 in that the organosilicon-modified hollow microspheres are prepared in Preparation Example 3.

[0099] Example 8

[0100] A thermal insulation coating structure differs from Example 6 in that the organosilicon-modified waste adhesive powder is prepared in Preparation Example 5.

[0101] Example 9

[0102] A thermal insulation coating structure differs from Example 6 in that the organosilicon-modified waste adhesive powder is prepared in Example 6.

[0103] Example 10

[0104] A thermal insulation coating structure, which differs from Example 8 in that the compound represented by general formula (Ⅰ) is specifically palmitoyl chloride.

[0105] Comparative Example

[0106] Comparative Example 1

[0107] A coating structure, which differs from Example 1 in that it consists only of an insulation layer.

[0108] Comparative Example 2

[0109] A coating structure that differs from Example 1 in that it has only a functional layer.

[0110] Comparative Example 3

[0111] A coating structure differs from Example 1 in that, in the insulation layer, an equal amount of organosilicon-modified waste adhesive powder prepared in Preparation Example 4 is used instead of organosilicon-modified hollow microspheres.

[0112] Comparative Example 4

[0113] A coating structure differs from Example 1 in that, in the insulation layer, an equal amount of organosilicon-modified hollow microspheres prepared in Preparation Example 1 are used instead of organosilicon-modified waste adhesive powder.

[0114] Comparative Example 5

[0115] A coating structure differs from Example 1 in that an equal amount of unmodified hollow microspheres are used instead of silicone-modified hollow microspheres in the insulation layer.

[0116] Comparative Example 6

[0117] A coating structure differs from Example 1 in that an equal amount of unmodified waste adhesive powder is used instead of organosilicon-modified waste adhesive powder in the insulation layer.

[0118] Comparative Example 7

[0119] A coating structure differs from Example 1 in that, in the insulation layer, an equal amount of unmodified hollow microspheres is used instead of silicone-modified hollow microspheres; and an equal amount of unmodified waste adhesive powder is used instead of silicone-modified waste adhesive powder.

[0120] Comparative Example 8

[0121] A coating structure, which differs from Example 1, uses an equal amount of lauroyl chloride instead of melamine in the functional layer.

[0122] Comparative Example 9

[0123] A coating structure, which differs from Example 1, uses an equal amount of melamine instead of lauroyl chloride in the functional layer.

[0124] Comparative Example 10

[0125] A coating structure that differs from Example 1 in that melamine and lauroyl chloride are not added to the functional layer.

[0126] Performance testing

[0127] Experiment 1: Thermal Insulation Performance Test

[0128] The coatings prepared in the following examples and comparative examples were used as test samples. The samples were uniformly coated onto a test steel plate to form a thermal insulation coating, and allowed to dry. The steel plate dimensions were 200mm × 200mm × 2mm, and the thickness of the thermal insulation coating was 1mm. An infrared lamp (250W) was used to simulate sunlight, with a distance of 4cm between the steel plate and the lamp source, allowing the thermal insulation coating surface to directly receive the light. A contact infrared thermometer was used to measure the temperature and its changes at the center of the back of the steel plate. To avoid environmental influences, the operation was carried out in a closed environment, and each example and comparative example was tested 10 times. The average value was calculated, rounded to the nearest integer, and recorded in the table below.

[0129]

[0130]

[0131] As can be seen from the data in the table above, the coating structures of Examples 1-10 of this application have better thermal insulation performance, which is significantly better than the relevant values ​​in Comparative Examples 1-10. After 20 minutes of simulated light irradiation, the temperature of the center part of the back of the steel plate with the thermal insulation coating prepared in the examples of this application remains basically constant, at 117-145℃. However, after 15 minutes of simulated light irradiation, the temperature of the center part of the back of the steel plate coated with the coating prepared in the comparative examples also remains basically constant, reaching 152-184℃, which is far higher than the constant value in the examples.

[0132] Experiment 2: Hydrophobicity Test

[0133] The test panels were treated according to the provisions of GB / T9271-2008 "Standard Test Panels for Paints and Varnishes", and then the water repellency (%) of the coating structure in the examples and comparative examples was tested according to GB / T10299-2011 "Test Method for Hydrophobicity of Thermal Insulation Materials", and the results were recorded in the table below.

[0134] Group Hydrophobicity (%) Group Hydrophobicity (%) Example 1 90 Comparative Example 1 57 Example 2 91 Comparative Example 2 73 Example 3 89 Comparative Example 3 85 Example 4 92 Comparative Example 4 80 Example 5 92 Comparative Example 5 73 Example 6 93 Comparative Example 6 77 Example 7 92 Comparative Example 7 70 Example 8 94 Comparative Example 8 63 Example 9 93 Comparative Example 9 64 Example 10 95 Comparative Example 10 60

[0135] As can be seen from the data in the table above, the hydrophobicity of the coating structures in Examples 1-10 of this application is greater than or equal to 90%, while the hydrophobicity of the coating structures in Comparative Examples 1-10 is only 57-85%. Therefore, it can be seen that the coating structures obtained in the examples of this application have better hydrophobic properties.

[0136] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A thermal insulation coating structure, comprising a thermal insulation layer and a functional layer; the thermal insulation layer is formed by curing a thermal insulation coating, the thermal insulation coating comprises the following raw materials in parts by weight: 20-35 parts of polysiloxane prepolymer; 5-10 parts of self-crosslinking acrylic acid; 4-6 parts of silicone modified hollow microsphere; 3-5 parts of silicone modified waste rubber powder; the silicone is an organic silicon compound with carbon atoms greater than or equal to 6; the functional layer is formed by curing a functional coating, the functional coating comprises the following raw materials in parts by weight: 60-80 parts of water-based acrylic resin; 20-30 parts of thermal insulation filler; 10-15 parts of cyanamide compound; 20-30 parts of compound represented by general formula (I); the preparation method of the silicone modified hollow microsphere is: mixing hollow microspheres and an organic silicon compound with carbon atoms greater than or equal to 6, adding methanol and ammonia water, centrifuging after ultrasonic treatment, discarding the supernatant, washing the precipitate with methanol, adding the precipitate into sodium silicate solution for reaction, washing with methanol after the reaction is completed, and obtaining the silicone modified hollow microsphere; the preparation method of the silicone modified waste rubber powder is: pretreating the waste rubber powder by immersing it in lye, washing after taking out, immersing it in an organic silicon compound with carbon atoms greater than or equal to 6 again, adding methanol, centrifuging after ultrasonic treatment, and washing the precipitate to obtain the silicone modified waste rubber powder; the organic silicon compound with carbon atoms greater than or equal to 6 is any one or more of octyl triethoxysilane, octyl trimethoxysilane and tetradecyloxysilane; the polysiloxane prepolymer is prepared from nano-silica sol, siloxane and silane end-capping agent; and / or the mass ratio of nano-silica sol, siloxane and silane end-capping agent in the polysiloxane prepolymer is 1:(0.8-1.2):(0.2-0.5); the siloxane is selected from one or more of methyl trimethoxysilane, methyl triethoxysilane, tetraethyl orthosilicate, methyl acryloyloxy propyl trimethoxysilane, phenyl trimethoxysilane, n-propyl trimethoxysilane and vinyl trimethoxysilane; and / or the silane end-capping agent is selected from any one of tetramethyldisiloxane, N-(n-butyl)-3-aminopropyl trimethoxysilane, anilinomethyl trimethoxysilane and anilinomethyl methyl dimethoxysilane; the mass ratio of the hollow microspheres to the organic silicon compound with carbon atoms greater than or equal to 6 is 1:(4-6); and / or when methanol and ammonia water are added, the addition is according to the mass ratio of the organic silicon compound with carbon atoms greater than or equal to 6:methanol:ammonia water = 1:(5-6):(1-1.2), the mass fraction of the ammonia water is 20-30%; and / or the amount of sodium silicate solution used is according to the mass ratio of the organic silicon compound with carbon atoms greater than or equal to 6:sodium silicate solution = 1:(0.15-0.2), the mass fraction of the sodium silicate solution is 10-20%. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ n is an integer from 5 to 80, R1, R2and R3are each independently selected from a hydrogen atom, a C1-C6linear or branched hydrocarbon group and derivatives thereof; ​ ​ 2. The thermal barrier coating structure of claim 1, wherein ​ 3. The thermal barrier coating structure of claim 1, wherein ​ 4. The thermal barrier coating structure of claim 3, wherein ​ 5. The thermal barrier coating structure of claim 4, wherein ​ 6. The thermal barrier coating structure of claim 1, wherein The mass ratio of the waste rubber powder and the organic silicon compound with carbon atoms greater than or equal to 6 is 1:(6-8); and / or the alkali liquor is a 10% sodium hydroxide solution, and the mass ratio of the waste rubber powder and the alkali liquor is 1:(5-10).

7. A thermally insulating coating structure according to any one of claims 1 to 6, wherein The aqueous acrylic resin in the functional layer is selected from Joncryl® 678, 6292. one or more of Vinofan W 3109ap; the heat insulating filler is selected from one or both of hollow glass microspheres, rutile titanium dioxide; the cyanamide compound is selected from melamine.

8. Process for the production of a thermal insulation coating structure according to any one of claims 1 to 7, characterized in that The method comprises the following steps: S1, preparing a thermal insulation coating and a functional coating respectively; S2, coating the thermal insulation coating on the surface of a coated object, curing to form a thermal insulation layer; S3, coating the functional coating on the surface of the thermal insulation layer, curing to form a functional coating layer.

9. The production method according to claim 8, wherein The preparation method of the thermal insulation coating is as follows: mixing polysiloxane prepolymer, self-crosslinking acrylic acid, organic silicon modified hollow microsphere and organic silicon modified waste rubber powder to obtain the thermal insulation coating; And / or the preparation method of the functional coating is as follows: mixing water-based acrylic resin, heat insulation filler, cyanamide compound and a compound represented by general formula (I) to obtain the functional coating.

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