Temperature-adaptable composite material and method for its production and use

Abstract

The application discloses a temperature-adaptive composite material and a preparation method and application thereof. The temperature-adaptive composite material is prepared by using carbon mineralization cementing powder as a cementing system, and by matching with filling powder, slurry hardening agent, foaming agent, foam stabilizer, bimodal temperature-sensitive capsules and multi-phase functional capsules. A stable matrix mainly composed of calcium carbonate and high-polymerization-degree silicon gel is formed through carbon mineralization curing, the absorption and reflection characteristics of the special material in the solar wave band are regulated by using the bimodal temperature-sensitive capsules, and the phase change heat storage behavior of the multi-phase functional capsules is used, so that the self-adaptive adjustment of the material to the environmental temperature is realized. The prepared special material can effectively inhibit the temperature fluctuation, reduce the temperature stress damage and maintain the stable volume and collapse performance under the working conditions of high temperature, low temperature and temperature cycle.

Description

Technical Field

[0001] This invention belongs to the field of aviation safety materials technology, and in particular relates to a temperature-adaptive composite material, its preparation method and application. Background Technology

[0002] With the development of the air transport industry, high-capacity and high-speed mainline aircraft have become the primary choice for airlines. Specialized Material Arresting Systems (EMAS) have been widely used on runways to provide preventative cushioning for aircraft that overrun the runway. EMAS are primarily composed of foamed concrete with highly stable collapse resistance; however, given that EMAS are located on open airport runways, environmental temperature degradation is unavoidable.

[0003] Traditional specialty materials are composed of ordinary silicate cement, typically black or gray in color. The dark surface causes a rapid rise in surface temperature during daytime sunlight exposure, while the internal temperature of the matrix lags behind the surface temperature rise. At night, due to the lack of solar energy, air convection and radiative cooling further reduce the surface temperature of the matrix to below ambient temperature. Therefore, traditional specialty materials do not exhibit daytime radiative cooling, only solar heating. Their inherently low thermal conductivity due to their porous structure amplifies the temperature stress on the surface and within the matrix, as well as on the radial scale. Long-term stress cycling leads to volumetric deformation of the matrix, further deteriorating its collapse resistance due to stress damage. Therefore, temperature difference becomes a crucial indicator of the weather resistance and stable service of specialty materials.

[0004] In existing building materials technologies, two independent technical systems are typically employed to mitigate temperature differences and thermal stress. The first technology involves introducing temperature-sensitive capsules into the material to switch between radiative cooling and solar heating effects. This limits solar energy absorption and surface temperature rise at high temperatures, while increasing solar energy absorption and promoting surface temperature rise at low temperatures. The second technology involves introducing capsules with latent heat of phase change, utilizing the solid-liquid phase change latent heat within the capsules to delay the heating or cooling process of the substrate.

[0005] However, a single technology system has inherent physical problems that are difficult to overcome. First, to avoid negatively impacting the mechanical properties of the matrix, the amount of capsules incorporated into the matrix is ​​limited. A small amount of temperature-sensitive capsules is sufficient to function, but a small number of latent heat capsules means that they become ineffective after storing sufficient latent heat during the day, making it difficult to further block heat flow; and after releasing the latent heat at night, they are also unable to maintain heat preservation. Second, a single temperature-sensitive capsule easily reaches its photothermal reflection limit under continuous exposure to sunlight during the day in summer, and the matrix will still heat up rapidly; while at night, the temperature-sensitive capsule completely loses its regulatory function due to the lack of sunlight input, making it difficult to suppress nighttime cooling.

[0006] Furthermore, if the two types of capsules are uniformly distributed throughout the matrix without differentiation during the preparation of the specialty material, the following problems will arise. First, the unique application scenarios and performance of the specialty material require highly stable collapse properties, and the impact of high capsule content on the specialty material is unknown. Second, on the surface of the specialty material, during the switching process between radiative cooling and solar heating effects, the latent heat of phase change capsules will severely interfere with this switching process; in the internal parts that are not exposed to the sun, the temperature-sensitive capsules are difficult to function. More importantly, this disordered mixing cannot be optimized according to the heat flow transfer path, resulting in low overall temperature difference regulation efficiency. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a temperature-adaptive composite material, its preparation method, and its application.

[0008] The objective of this invention is achieved through the following technical solution: A temperature-adaptive composite material is prepared from the following components in parts by weight: 0.9-1.2 parts of carbon mineralized gel powder, 0.5-6 parts of filler powder, 0.03-0.4 parts of slurry hardener, 0.005-0.1 parts of foaming agent, 0.005-0.1 parts of foam stabilizer, 0.001-0.25 parts of modified bimodal temperature-sensitive capsule, 0.001-0.35 parts of modified multiphase functional capsule, and 0.3-3 parts of mixing water.

[0009] Preferably, the carbon mineralized gel powder is at least one of dicalcium silicate, monocalcium silicate, tricalcium disilicate, and tricalcium silicate.

[0010] In this invention, a matrix with a uniform degree of carbonation reaction can be obtained by carbon mineralization gelling powder after carbonation curing. This is beneficial for gelling other components and obtaining a material with stable collapse properties. On the other hand, the influence of factors such as filler powder, slurry hardener, capsules, and foam in the carbonation reaction will construct a porous state composed of macroscopic foam. There is a significant difference in refractive index between the calcium carbonate crystals in the pores and the air, which induces a strong Mie scattering process in the solar spectrum band. This is beneficial for enhancing the scattering of solar photon energy incident on the surface of the material. The calcium carbonate crystals and high-polymerization silica gel produced by the carbonation reaction have high emissivity within the atmospheric window range, which can radiate the thermal energy of the material into outer space, realizing the radiative cooling process of the material.

[0011] Preferably, the filler powder is at least one of nano barium titanate, nano titanium dioxide, nano zinc oxide, nano limestone powder, nano quartz powder, nano aluminum oxide, and nano barium sulfate.

[0012] In this invention, the filler powders are made of nanomaterials, possessing abundant specific surface area. On one hand, they can regulate the rheological properties of the slurry, improve its plastic viscosity, suppress foam rise, and participate in the microporous structure. On the other hand, they all have good refractive indices, forming a matrix with refractive differences between themselves and air within the foam structure of the characteristic material, promoting the scattering process. Furthermore, because the filler powders are all inorganic non-metallic materials, they all have strong atmospheric window emission efficiency, synergistically enhancing the radiative cooling process of the characteristic material.

[0013] Preferably, the slurry hardener is at least one of calcium sulfate hemihydrate, calcium sulfate anhydrous, white silicate cement, and white sulfoaluminate cement.

[0014] In this invention, the slurry hardener is a light-colored or white cementitious material. On the one hand, this provides the material with moderate early strength, facilitating the shaping and demolding process. On the other hand, it prevents dark-colored materials from absorbing incident sunlight, thus reducing the radiative cooling effect.

[0015] Preferably, the foaming agent is at least one of protein-based foaming agents, surfactant-based foaming agents, and carbon dioxide.

[0016] Preferably, the foam stabilizer is at least one selected from polyvinyl alcohol, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, and stearate.

[0017] In this invention, a stable foam structure can be formed by the foaming agent and the foam stabilizer in an aqueous solution. A small amount of carbon dioxide stored in the foam participates in the formation of the foam pore structure on the one hand, and on the other hand, participates in the carbonation curing process.

[0018] Preferably, the modified bimodal temperature-sensitive capsule uses a polymer shell, internally encapsulates fatty acid esters, bisphenol A substances, and temperature-sensitive pigments, and is prepared by siloxane grafting treatment; wherein, the polymer is selected from at least one of urea-formaldehyde resin, melamine-formaldehyde resin, and polyurethane / polyurea composite resin; and the temperature sensitivity is at least one of fluorane materials, spiropyrans, spiroxazines, or triarylmethanes.

[0019] In this invention, the dual-modal temperature-sensitive capsule can alter the spectrum of a characteristic material within the solar radiation band, enabling it to exhibit radiative cooling or solar heating effects under different environments. The theoretical power of solar energy is approximately 1000 W / m², while the theoretical power radiated by the material through an atmospheric window into outer space is approximately 150 W / m². By adjusting the reflectivity spectrum of the characteristic material within the solar radiation band, the dual-modal temperature-sensitive capsule can more quickly change the absorbed power. When the absorbed power is less than the radiated power, a radiative cooling effect is achieved; when the absorbed power is greater than the radiated power, a solar heating effect is achieved.

[0020] Preferably, the modified multiphase functional capsule is made by using a polymer as the shell, encapsulating at least one of paraffin-like substances, fatty alcohols, fatty acids, fatty acid esters, and polyethylene glycol, and is prepared by grafting with siloxane groups; wherein the polymer is selected from at least one of urea-formaldehyde resin, melamine-formaldehyde resin, and polyurethane / polyurea composite resin.

[0021] In this invention, multiphase functional capsules play a crucial role in the specialty material. The foam structure of the specialty material exhibits low thermal conductivity, providing insulation, but it also induces temperature differences and thermal stress, which are detrimental to volume stability and collapse stability. For example, in summer, the upper surface absorbs solar energy and heats up rapidly, while the lower surface remains at a low temperature; in winter, the upper surface cools down rapidly due to low solar power and cold wind-induced thermal convection, while the lower surface remains at a relatively high temperature. The introduction of multiphase functional capsules acts as a peak-shaving and valley-leveling mechanism. At high temperatures, it absorbs heat energy and limits the rapid rise in matrix temperature; at low temperatures, it releases latent heat and heats the matrix, promoting its temperature rise. This allows the specialty material to maintain a relatively stable temperature range throughout all weather conditions.

[0022] In this invention, the capsule shell utilizes a composite resin system, which is stable and resistant to breakage and leakage. Simultaneously, the surface undergoes mature siloxy group grafting treatment, enhancing its adhesion to carbonation reaction products and promoting the overall microstructural stability and collapse resistance stability of the characteristic materials.

[0023] The preparation method of the above-mentioned temperature-adaptive composite material includes the following steps: According to the corresponding component ratio, take the mineralized gelling powder, filler powder, slurry hardener, modified multiphase functional capsules and part of the mixing water, mix them evenly to obtain the first slurry; The foaming agent and foam stabilizer are mixed with the remaining mixing water, and carbon dioxide is introduced to foam the mixture to obtain a foamed body. The foamed material is mixed with the first slurry to obtain a second slurry; A portion of the second slurry is mixed with the modified bimodal temperature-sensitive capsule to obtain a third slurry; The remaining second slurry is injected into the bottom layer of the mold, followed by the addition of the third slurry. After conventional curing to the specified age, the sample is demolded and then subjected to carbonation curing to obtain the temperature-adaptive composite material.

[0024] Preferably, in the preparation step of the first slurry, the mixing water accounts for 65-90 wt% of the total mixing water.

[0025] Preferably, in the preparation step of the third slurry, 5-45 wt% of the second slurry is mixed with the modified bimodal temperature-sensitive capsule to obtain the third slurry.

[0026] Preferably, in the preparation step of the temperature-adaptive composite material, the process parameters for conventional curing include: temperature of 20~50℃, relative humidity of 50~99%, and curing days of 1~28 days.

[0027] Preferably, in the preparation step of the temperature-adaptive composite material, the process parameters of the carbonation curing include: temperature of 10~80℃, relative humidity of 40~99%, carbon dioxide concentration of 5~99%, pressure of 0.05~0.3MPa, and curing days of 1~28 days.

[0028] The application of the above-mentioned temperature-adaptive composite materials in airport runway arresting systems.

[0029] Compared with the prior art, the beneficial effects of the present invention include: (1) By giving the material a functional design for radiation cooling and solar heating, and combining the phase change heat storage and release mechanism of the multiphase functional capsule, the composite material exhibits radiation cooling effect in high temperature environment and solar heating and latent heat release effect in low temperature environment, avoiding the overheating or overcooling problem of traditional special materials under extreme climate conditions, realizing the synergistic effect of intelligent photothermal switch and heat storage, and breaking through the single temperature control limit.

[0030] (2) The present invention introduces dual-modal temperature-sensitive capsules and multiphase functional capsules in the surface layer of the material and only introduces multiphase functional capsules in the bottom layer to achieve functional gradient distribution, effectively suppress the temperature difference between the upper and lower surfaces, reduce volume deformation, microcracks and freeze-thaw damage caused by temperature cycling, and improve the volume stability and collapse performance stability of the characteristic material.

[0031] (3) The present invention reduces the amount of functional capsules while ensuring temperature response performance, and has good engineering economy. Detailed Implementation

[0032] 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 merely illustrative and not intended to limit the invention.

[0033] Example 1 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 1.6 parts filler powder, 0.16 parts slurry hardener, 0.03 parts foaming agent, 0.03 parts foam stabilizer, 0.01 parts modified bimodal temperature-sensitive capsule, 0.04 parts modified multiphase functional capsule and 0.8 parts mixing water.

[0034] The carbon mineralized gelled powder was prepared in-house. The specific preparation steps were as follows: calcium carbonate and silicon dioxide were uniformly mixed at a molar ratio of 2:1 and calcined in a high-temperature furnace at 1450℃ for 3 hours to obtain a mixed powder consisting of dicalcium silicate and tricalcium disilicate (3CaO·2SiO2). XRD quantitative analysis showed that the dicalcium silicate content was 98% and the tricalcium disilicate content was 2%. The particle size distribution was as follows: <10μm particles accounted for 10%, 10~30μm particles accounted for 80%, and 30~45μm particles accounted for 10%.

[0035] The filler powder is a mixture of nano-alumina and nano-barium sulfate purchased from Shanghai Aladdin Pharmaceutical Co., Ltd., with a mass ratio of 50%:50% for the two powders. The particle size distribution of the mixed powder is D10=300nm, D50=500nm, and D90=600nm.

[0036] The slurry hardener is hemihydrate α-type calcium sulfate provided by Shandong Taishan Gypsum Co., Ltd., with a calcium sulfate content greater than 90% and a particle size distribution D50=15μm.

[0037] The foaming agent is LG-2258 plant protein cement foaming agent produced by Shandong Yousuo Chemical Technology Co., Ltd., and the foam stabilizer is carboxymethyl cellulose V produced by Shanghai Aladdin Group, with a MW of 90000 (DS=0.7) and a viscosity of 50~100mPa.s.

[0038] The modified bimodal temperature-sensitive capsule was prepared as follows: tetraethyl orthosilicate produced by Shanghai Aladdin Pharmaceutical Co., Ltd. and silane coupling agent KH-550 were weighed at a mass ratio of 10:1 and prepared into 100 mL of hydrolysis solution. After stirring for 10 min, 1 g of the bimodal temperature-sensitive capsule was added and thoroughly mixed. After filtration and vacuum drying, the modified bimodal temperature-sensitive capsule was obtained.

[0039] The dual-modal temperature-sensitive capsule (Black-31) was purchased from Shenzhen Huancai Color Changing Technology Co., Ltd. The shell component is melamine formaldehyde, and the internal components are encapsulated with methyl octadecyl carbonate, ethyl octadecyl acetate, bisphenol A, and black temperature-sensitive pigments ODB-II and GreenDCF. The temperature transition point is 31°C.

[0040] The multiphase functional capsule was prepared as follows: tetraethyl orthosilicate produced by Shanghai Aladdin Pharmaceutical Co., Ltd. and silane coupling agent KH-550 were weighed at a mass ratio of 10:1 and prepared into 100mL of hydrolysis solution. After stirring for 10min, 1g of the multiphase functional capsule was added and thoroughly mixed. After filtration and vacuum drying, the modified bimodal temperature-sensitive capsule was obtained.

[0041] The multiphase functional capsule (ZJ-PCM-M-37) was purchased from Guangzhou Zhongjia New Material Technology Co., Ltd. Its core material content is 80%, the shell component is a copolymer of polyurethane and polyurea resin, and it is internally encapsulated with methyl octadecanoate and ethyl octadecanoate. Its phase transition point is 30°C.

[0042] The mixing water is municipal tap water.

[0043] The specific steps for preparing the above-mentioned temperature-adaptive composite material are as follows: (1) According to the corresponding component ratio, take the mineralized gelling powder, filling powder, slurry hardener, modified multiphase functional capsule and 80wt% mixing water, mix them evenly to obtain the first slurry; (2) The foaming agent and foam stabilizer are mixed with the remaining 20wt% of mixing water, and carbon dioxide is introduced to foam the foam to obtain a foamed body; (3) The foamed body is mixed with the first slurry to obtain a second slurry; (4) Mix 20 wt% of the second slurry with the modified bimodal temperature-sensitive capsule to obtain the third slurry; (5) The remaining 80wt% of the second slurry is injected into the bottom layer of the mold, followed by the third slurry. After leveling, it is sent for conventional curing: cured at 25°C and 99% humidity for 7 days. After curing, the molded block is demolded and placed in a curing tank with carbon dioxide pressure of 0.15MPa, concentration of 90%, temperature of 25°C and humidity of 90% for continued curing for 7 days. After curing, the dried product is obtained, which is the temperature-adaptive composite material.

[0044] Example 2 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 5 parts filler powder, 0.16 parts slurry hardener, 0.04 parts foaming agent, 0.04 parts foam stabilizer, 0.015 parts modified bimodal temperature-sensitive capsule, 0.05 parts modified multiphase functional capsule and 1.15 parts mixing water.

[0045] The raw material composition of each of the above components is the same as that in Example 1.

[0046] The specific steps for preparing the above-mentioned temperature-adaptive composite material are as follows: (1) According to the corresponding component ratio, take the mineralized gelling powder, filling powder, slurry hardener, modified multiphase functional capsule and 80wt% mixing water, mix them evenly to obtain the first slurry; (2) The foaming agent and foam stabilizer are mixed with the remaining 20wt% of mixing water, and carbon dioxide is introduced to foam the foam to obtain a foamed body; (3) The foamed body is mixed with the first slurry to obtain a second slurry; (4) Mix 20 wt% of the second slurry with the modified bimodal temperature-sensitive capsule to obtain the third slurry; (5) The remaining 80wt% of the second slurry is injected into the bottom layer of the mold, followed by the third slurry. After leveling, it is sent for conventional curing: cured at 25°C and 99% humidity for 7 days. After curing, the molded block is demolded and placed in a curing tank with carbon dioxide pressure of 0.15MPa, concentration of 90%, temperature of 25°C and humidity of 90% for continued curing for 7 days. After curing, the dried product is obtained, which is the temperature-adaptive composite material.

[0047] Comparative Example 1 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 1.6 parts filler powder, 0.16 parts slurry hardener, 0.03 parts foaming agent, 0.03 parts foam stabilizer, 0.04 parts modified multiphase functional capsules and 0.8 parts mixing water.

[0048] The raw material composition of each of the above components is the same as that in Example 1.

[0049] The specific steps for preparing the above-mentioned temperature-adaptive composite material are as follows: (1) According to the corresponding component ratio, take the mineralized gelling powder, filling powder, slurry hardener, multiphase functional capsule and 80wt% mixing water, mix them evenly to obtain the first slurry; (2) The foaming agent and foam stabilizer are mixed with the remaining 20wt% of mixing water, and carbon dioxide is introduced to foam the foam to obtain a foamed body; (3) The foamed body is mixed with the first slurry to obtain a second slurry; (4) Take 20wt% of the second slurry and use it as the third slurry; (5) The remaining 80wt% of the second slurry is injected into the bottom layer of the mold, followed by the third slurry. After leveling, it is sent for conventional curing: cured at 25°C and 99% humidity for 7 days. After curing, the molded block is demolded and placed in a curing tank with carbon dioxide pressure of 0.15MPa, concentration of 90%, temperature of 25°C and humidity of 90% for continued curing for 7 days. After curing, the dried product is obtained, which is the temperature-adaptive composite material.

[0050] Comparative Example 2 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 1.6 parts filler powder, 0.16 parts slurry hardener, 0.03 parts foaming agent, 0.03 parts foam stabilizer, 0.01 parts modified bimodal temperature-sensitive capsule and 0.8 parts mixing water.

[0051] The raw material composition of each of the above components is the same as that in Example 1.

[0052] The specific steps for preparing the above-mentioned temperature-adaptive composite material are as follows: (1) According to the corresponding component ratio, take the mineralized gelling powder, filling powder, slurry hardener and 80wt% mixing water, mix them evenly to obtain the first slurry; (2) The foaming agent and foam stabilizer are mixed with the remaining 20wt% of mixing water, and carbon dioxide is introduced to foam the foam to obtain a foamed body; (3) The foamed body is mixed with the first slurry to obtain a second slurry; (4) Mix 20 wt% of the second slurry with the dual-modal temperature-sensitive capsule to obtain the third slurry; (5) The remaining 80wt% of the second slurry is injected into the bottom layer of the mold, followed by the third slurry. After leveling, it is sent for conventional curing: cured at 25°C and 99% humidity for 7 days. After curing, the molded block is demolded and placed in a curing tank with carbon dioxide pressure of 0.15MPa, concentration of 90%, temperature of 25°C and humidity of 90% for continued curing for 7 days. After curing, the dried product is obtained, which is the temperature-adaptive composite material.

[0053] Comparative Example 3 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 1.6 parts filler powder, 0.16 parts slurry hardener, 0.03 parts foaming agent, 0.03 parts foam stabilizer and 0.8 parts mixing water.

[0054] The raw material composition of each of the above components is the same as that in Example 1.

[0055] The specific steps for preparing the above-mentioned temperature-adaptive composite material are as follows: (1) According to the corresponding component ratio, take the mineralized gelling powder, filling powder, slurry hardener and 80wt% mixing water, mix them evenly to obtain the first slurry; (2) The foaming agent and foam stabilizer are mixed with the remaining 20wt% of mixing water, and carbon dioxide is introduced to foam the foam to obtain a foamed body; (3) The foamed body is mixed with the first slurry to obtain a second slurry; (4) Use 20wt% of the second slurry as the third slurry; (5) The remaining 80wt% of the second slurry is injected into the bottom layer of the mold, followed by the third slurry. After leveling, it is sent for conventional curing: cured at 25°C and 99% humidity for 7 days. After curing, the molded block is demolded and placed in a curing tank with carbon dioxide pressure of 0.15MPa, concentration of 90%, temperature of 25°C and humidity of 90% for continued curing for 7 days. After curing, the dried product is obtained, which is the temperature-adaptive composite material.

[0056] Comparative Example 4 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 1.6 parts filler powder, 0.16 parts slurry hardener, 0.03 parts foaming agent, 0.03 parts foam stabilizer, 0.01 parts modified bimodal temperature-sensitive capsule, 0.04 parts modified multiphase functional capsule and 0.8 parts mixing water.

[0057] The raw material composition of each of the above components is the same as that in Example 1.

[0058] The specific steps for preparing the above-mentioned temperature-adaptive composite material are as follows: (1) According to the corresponding component ratio, take the mineralized gelling powder, filling powder, slurry hardener, modified multiphase functional capsule, modified dual-modal temperature-sensitive capsule and 80wt% mixing water, mix them evenly to obtain the first slurry; (2) The foaming agent and foam stabilizer are mixed with the remaining 20wt% of mixing water, and carbon dioxide is introduced to foam the foam to obtain a foamed body; (3) The foamed body is mixed with the first slurry to obtain a second slurry; (4) The second slurry is injected into the mold, leveled, and then sent for conventional curing: cured for 7 days at a temperature of 25°C and a humidity of 99%; after curing, the molded block is demolded and placed in a curing tank with a carbon dioxide pressure of 0.15 MPa, a concentration of 90%, a temperature of 25°C, and a humidity of 90% for continued curing for 7 days. After curing, the dried product is obtained, which is the temperature-adaptive composite material.

[0059] Comparative Example 5 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 1.6 parts filler powder, 0.16 parts slurry hardener, 0.03 parts foaming agent, 0.03 parts foam stabilizer, 0.3 parts modified bimodal temperature-sensitive capsule, 0.4 parts modified multiphase functional capsule and 0.8 parts mixing water.

[0060] The raw material composition of each of the above components is the same as that in Example 1.

[0061] The preparation method of the above-mentioned temperature-adaptive composite material is the same as that in Example 1.

[0062] Comparative Example 6 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 5 parts filler powder, 0.16 parts slurry hardener, 0.04 parts foaming agent, 0.04 parts foam stabilizer, 0.015 parts bimodal temperature-sensitive capsule, 0.05 parts multiphase functional capsule and 1.15 parts mixing water.

[0063] The raw material composition of the above components is the same as that in Example 2, except that the dual-modal temperature-sensitive capsule and the multiphase functional capsule are not subjected to siloxane grafting treatment.

[0064] The preparation method of the above-mentioned temperature-adaptive composite material is the same as that in Example 2.

[0065] Comparative Example 7 A temperature-adaptive composite material is prepared from the following components in parts by weight: 1 part carbon mineralized gel powder, 5 parts filler powder, 0.16 parts slurry hardener, 0.04 parts foaming agent, 0.04 parts foam stabilizer, 0.015 parts modified bimodal temperature-sensitive capsule, 0.05 parts modified multiphase functional capsule and 1.15 parts mixing water.

[0066] The raw material composition of the above components is the same as in Example 2, the only difference being the use of titanium sol to modify the surface of the bimodal temperature-sensitive capsules and multiphase functional capsules. The specific preparation method is as follows: 1 part tetraisopropyl titanate is dissolved in 30 parts anhydrous ethanol, and added dropwise at a rate of 1-5 drops / second to a mixture of 0.8 parts acetic acid and 16 parts deionized water; the mixture is stirred for 48 hours and aged for 72 hours to obtain a 2wt% titanium sol. Capsules of equal mass to tetraisopropyl titanate are weighed according to dry weight and added to the above titanium sol, and ultrasonically mixed for 3 hours to obtain titanium sol-modified capsules.

[0067] The preparation method of the above-mentioned temperature-adaptive composite material is the same as that in Example 2.

[0068] The temperature-adaptive composite materials prepared in Examples 1-2 and Comparative Examples 1-7 were subjected to various performance tests. The degree of change in collapsibility performance was measured according to the indicators in MH / T 5111-2015 "Characteristic Materials Barrier Systems". The temperature difference between the upper and lower surfaces of the characteristic materials was measured using thermocouples. During the temperature test, the test material blocks were placed in hollow foam boxes with the interior emptied. The surface of the foam boxes was covered with aluminum foil with high reflectivity (85% reflectivity) to isolate the experimental measurements from solar radiation. The experimental measurement data are shown in Table 1.

[0069] Table 1 Test Results

[0070] Referring to Table 1, analysis of the experimental results of Example 1 and Comparative Examples 1-6 reveals that when a single capsule is used in the specialty material, the temperature data reflects its physical limitations. The comparative examples without dual-modal temperature-sensitive capsules lack spectral modulation and thermal balance capabilities. In the comparative examples without multiphase functional capsules, heat storage and thermal conductivity are lacking, resulting in a significant temperature difference between the upper and lower surfaces, which is detrimental to the stability of the specialty material. However, excessive introduction of these capsules degrades the collapse performance stability of the specialty material, neglecting its most important mechanical properties.

[0071] Analysis of Example 2 and Comparative Examples 6 and 7 shows that the silane grafting treatment mentioned in this invention is more suitable for the product distribution structure of calcium carbonate crystals encapsulating silica gel in the carbonation reaction product. However, capsules without surface treatment and those without titanium sol treatment are difficult to form stronger chemical bonds with calcium carbonate crystals and silica gel products, thus resulting in failure to meet performance requirements in terms of collapse performance.

[0072] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A temperature-adaptive composite material, characterized in that, It is prepared from the following components in parts by weight: 0.9-1.2 parts carbon mineralized gel powder, 0.5-6 parts filler powder, 0.03-0.4 parts slurry hardener, 0.005-0.1 parts foaming agent, 0.005-0.1 parts foam stabilizer, 0.001-0.25 parts modified bimodal thermosensitive capsule, 0.001-0.35 parts modified multiphase functional capsule and 0.3-3 parts mixing water.

2. The temperature-adaptive composite material according to claim 1, characterized in that, The carbon mineralized gelling powder is at least one of dicalcium silicate, monocalcium silicate, tricalcium disilicate, and tricalcium silicate; and / or The filler powder is at least one of nano barium titanate, nano titanium dioxide, nano zinc oxide, nano limestone powder, nano quartz powder, nano aluminum oxide, and nano barium sulfate.

3. The temperature-adaptive composite material according to claim 1, characterized in that, The slurry hardener is at least one of calcium sulfate hemihydrate, anhydrous calcium sulfate, white silicate cement, and white sulfoaluminate cement; and / or The foaming agent is at least one of protein-based foaming agents, surfactant-based foaming agents, and carbon dioxide; and / or The foam stabilizer is at least one of polyvinyl alcohol, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, and stearate.

4. The temperature-adaptive composite material according to claim 1, characterized in that, The modified bimodal temperature-sensitive capsule is made of a polymer shell, encapsulating fatty acid esters, bisphenol A substances and temperature-sensitive pigments inside, and is prepared by grafting siloxane groups; wherein, the polymer is selected from at least one of urea-formaldehyde resin, melamine-formaldehyde resin and polyurethane / polyurea composite resin; the temperature sensitivity is at least one of fluorane materials, spiropyrans, spiroxazines or triarylmethanes.

5. The temperature-adaptive composite material according to claim 1, characterized in that, The modified multiphase functional capsule is made by using a polymer as the shell and encapsulating at least one of paraffin-like substances, fatty alcohols, fatty acids, fatty acid esters, and polyethylene glycol inside, and is prepared by grafting with siloxane groups; wherein the polymer is selected from at least one of urea-formaldehyde resin, melamine-formaldehyde resin, and polyurethane / polyurea composite resin.

6. A method for preparing the temperature-adaptive composite material according to any one of claims 1 to 5, characterized in that, Includes the following steps: According to the corresponding component ratio, take the mineralized gelling powder, filler powder, slurry hardener, modified multiphase functional capsules and part of the mixing water, mix them evenly to obtain the first slurry; The foaming agent and foam stabilizer are mixed with the remaining mixing water, and carbon dioxide is introduced to foam the mixture to obtain a foamed body. The foamed material is mixed with the first slurry to obtain a second slurry; A portion of the second slurry is mixed with the modified bimodal temperature-sensitive capsule to obtain a third slurry; The remaining second slurry is injected into the bottom layer of the mold, followed by the addition of the third slurry. After conventional curing to the specified age, the sample is demolded and then subjected to carbonation curing to obtain the temperature-adaptive composite material.

7. The method for preparing the temperature-adaptive composite material according to claim 6, characterized in that, In the preparation step of the first slurry, the mixing water accounts for 65-90 wt% of the total mixing water; and / or In the preparation step of the third slurry, 5-45 wt% of the second slurry is mixed with the modified bimodal temperature-sensitive capsule to obtain the third slurry.

8. The method for preparing the temperature-adaptive composite material according to claim 6, characterized in that, In the preparation steps of the temperature-adaptive composite material, the process parameters for conventional curing include: temperature of 20~50℃, relative humidity of 50~99%, and curing days of 1~28 days.

9. The method for preparing the temperature-adaptive composite material according to claim 6, characterized in that, In the preparation steps of the temperature-adaptive composite material, the process parameters for carbonation curing include: temperature of 10~80℃, relative humidity of 40~99%, carbon dioxide concentration of 5~99%, pressure of 0.05~0.3MPa, and curing days of 1~28 days.

10. The application of the temperature-adaptive composite material according to any one of claims 1 to 5 in an airport runway arresting system.

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