Pouring sealant, preparation method of pouring sealant and laying method of pouring sealant

Abstract

The invention discloses a pouring sealant, a preparation method of the pouring sealant and a laying method of the pouring sealant, and relates to the technical field of asphalt pavement maintenance, the pouring sealant comprises a silicone rubber matrix, the silicone rubber matrix comprises a combination of vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil; the graded transparent silicon dioxide comprises a combination of spherical nano SiO2 and mesoporous SiO2; a silane coupling agent compound system is a combination of gamma-glycidyl ether oxypropyl trimethoxy silane and vinyl triethoxy silane, and the silane coupling agent compound system is a combination of gamma-glycidyl ether oxypropyl trimethoxy silane and vinyl triethoxy silane; a multi-stage elasticity modifier comprising a combination of a low temperature elastomeric agent, a high temperature elastomeric agent, and a siloxane copolymer; a temperature gradient vulcanization system comprising a combination of a platinum complex catalyst and a reaction inhibitor; the invention discloses a synergistic anti-reflection nano composite material. The invention relates to a UV-A benzotriazole derivative. Through cooperative configuration of the silicone rubber matrix and the graded transparent silicon dioxide, unification of mechanical strength and optical transparency is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavement maintenance and repair, in particular to a potting compound, a preparation method of the potting compound and a method for laying the potting compound. Background Art

[0002] Asphalt pavement, a staple of modern road construction, offers advantages such as comfortable driving, low noise, and easy construction. It is widely used in infrastructure such as highways, urban roads, and airport runways. However, over long-term use, asphalt pavements inevitably develop various cracks and defects due to factors such as temperature fluctuations, vehicle loads, material aging, and water damage. If not repaired promptly, these cracks will further develop into serious defects such as potholes and cracks, affecting the road's service life and driving safety. Traditional crack repair methods primarily use hot asphalt grouting or modified asphalt grouting. However, with the improvement of road maintenance standards and the development of intelligent detection technology, existing technologies have exposed many shortcomings.

[0003] First, the transparency and aesthetics are poor. Traditional caulking materials are mostly dark or black, which creates a significant color difference with the original road surface after repair, seriously affecting the appearance of the road. This problem is particularly prominent in landscape roads and high-grade highways.

[0004] Secondly, the elastic adaptability is insufficient. Existing caulking materials usually use a single formula and cannot be selected according to the movement characteristics of different cracks. As a result, high-movement cracks are prone to cracking, while low-movement cracks suffer from material waste and excessive softness.

[0005] Finally, the interface bonding strength is low. Traditional repair methods mainly rely on physical interlocking, and there is a lack of effective chemical bonding between the aggregate and the caulking material, which is prone to interface delamination under temperature cycles and vehicle loads. Summary of the Invention

[0006] In view of the problems existing in the existing potting glue, the preparation method of the potting glue and the laying method of the potting glue, the present invention is proposed.

[0007] Therefore, the problem to be solved by the present invention is to provide a potting glue with excellent transparency, multi-level elastic adjustment ability and strong interface bonding performance, and its preparation and laying method, so as to achieve seamless and smooth repair of road cracks, and at the same time establish a precise temperature gradient construction process to ensure that the repair quality is stable and controllable, and meet the high standards of modern road maintenance.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] In a first aspect, an embodiment of the present invention provides a potting compound comprising the following components by weight:

[0010] Silicone rubber matrix: 90-110 parts, which includes a combination of vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil;

[0011] Graded transparent silica: 15-25 parts, which includes a combination of spherical nano-SiO2 and mesoporous SiO2;

[0012] Silane coupling agent compound system: 0.5-2 parts, a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltriethoxysilane;

[0013] Multi-stage elasticity regulator: 5-15 parts, which includes a combination of low-temperature elasticity agent, high-temperature elasticity agent and silicone copolymer;

[0014] Temperature gradient vulcanization system: 0.1-0.8 parts, which includes a combination of a platinum complex catalyst and a reaction inhibitor;

[0015] Synergistic antireflection nanocomposite material: 0.2-1 part;

[0016] UV-A benzotriazole derivative: 0.1-0.5 parts;

[0017] The low-temperature elastic agent is vinyl-terminated polysiloxane with a molecular weight of 8000-12000;

[0018] The high-temperature elastic agent is vinyl-terminated polysiloxane with a molecular weight of 15,000-25,000.

[0019] As a preferred embodiment of the potting compound of the present invention, the particle size of the spherical nano-SiO2 is 15-25 nm; the particle size of the mesoporous SiO2 is 50-80 nm.

[0020] As a preferred embodiment of the potting compound of the present invention, the steps for preparing the synergistic anti-reflection nanocomposite material include:

[0021] Dispersing graphene oxide in anhydrous isopropanol at a concentration of 1-3 g / L, ultrasonically dispersing at a power density of 300-500 W / L for 3-5 hours to obtain a stable graphene oxide dispersion;

[0022] Add L-ascorbic acid-citric acid composite reducing system to the graphene oxide dispersion, adjust the pH to 6-7, raise the temperature to 75-80°C under an inert atmosphere, react for 2 hours, then add 3-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane in a molar ratio of 2:1, and continue the reaction for 6-8 hours;

[0023] After the reaction is completed, the reaction is continued at 75-80°C for 2-3 hours to fully bond and crosslink the silane molecules with the reduced graphene surface, and ethyl orthosilicate and deionized water are added dropwise to maintain a weakly acidic pH of 5-6. A nano-SiO2 coating is in situ generated on the reduced graphene surface by a sol-gel method. The reaction temperature is maintained at 75-80°C for 4-6 hours, and the coating thickness is 2-8 nm.

[0024] The synergistic anti-reflection nanocomposite material is obtained by centrifugal separation, anhydrous ethanol washing and vacuum drying.

[0025] The beneficial effects of this preferred technical solution are: the synergistic anti-reflection nanocomposite material adopts a unique three-layer structure of reduced graphene-silane coupling-SiO2 coating, graphene provides thermal conductivity, the silane layer ensures interface compatibility, and the SiO2 coating enhances transparency, achieving a synergistic effect of thermal conductivity, anti-reflection and enhancement.

[0026] As a preferred embodiment of the potting compound of the present invention, the weight ratio of the platinum complex catalyst to the reaction inhibitor is 1:0.5-2;

[0027] The weight ratio of the spherical nano-SiO2 to the mesoporous SiO2 is 1-2:1;

[0028] The weight ratio of the γ-glycidyloxypropyltrimethoxysilane to vinyltriethoxysilane is 2-4:1.

[0029] As a preferred embodiment of the potting compound of the present invention, the potting compound is divided into high-elastic potting compound, medium-elastic potting compound and low-elastic potting compound according to the different ratios of the low-temperature elastic agent, the high-temperature elastic agent and the siloxane copolymer in the multi-stage elasticity regulator;

[0030] The ratio of the low-temperature elastic agent, the high-temperature elastic agent and the siloxane copolymer of the high-elastic potting compound is 4:6:1.

[0031] The ratio of the low-temperature elastic agent, high-temperature elastic agent and silicone copolymer of the medium-bullet type potting adhesive is 3:4:1.5;

[0032] The low-elasticity potting compound has a low-temperature elastic agent, a high-temperature elastic agent and a silicone copolymer in a ratio of 2:3:2.

[0033] The beneficial effects of this preferred technical solution are: a three-level grading system based on the ratio of elastic regulators is established, the high-elastic type adapts to large deformation cracks, the medium-elastic type balances performance, and the low-elastic type provides high strength, realizing matching repair of multiple types of materials.

[0034] In a second aspect, an embodiment of the present invention provides a method for preparing a potting compound, comprising the following steps:

[0035] Mix vinyl-terminated polydimethylsiloxane and hydrogenated silicone oil in a weight ratio of 3-5:1, and stir at 60-80° C. for 30-60 minutes to obtain a silicone rubber matrix;

[0036] After mixing spherical nano-SiO2 and mesoporous SiO2, adding a silane coupling agent compound system for surface treatment, reacting at 80-100°C for 1-2 hours to obtain modified graded transparent silica;

[0037] Mix the silicone rubber matrix with modified graded transparent silica, add a multi-grade elasticity regulator, and stir and mix evenly at room temperature;

[0038] Add the synergistic antireflection nanocomposite and UV-A benzotriazole derivative in sequence, stir and disperse evenly;

[0039] Finally, the temperature gradient vulcanization system is added, and after rapid stirring and mixing, degassing is performed under vacuum conditions to obtain the potting glue.

[0040] As a preferred embodiment of the method for preparing the potting compound of the present invention, the viscosity of the vinyl-terminated polydimethylsiloxane is 1000-5000 mPa·s, and the hydrogen content of the hydrogenated silicone oil is 0.15-0.25%;

[0041] The synergistic anti-reflection nanocomposite material is dispersed by ultrasound;

[0042] The degassing treatment is performed at a pressure of -0.08 to -0.1 MPa and for a time of 5 to 15 minutes.

[0043] In a third aspect, an embodiment of the present invention provides a method for laying a potting compound, comprising the following steps:

[0044] For cracks in the road to be repaired, collect information on crack movement, aggregate color, and gradation of the original asphalt mixture;

[0045] Carry out dirt cleaning pretreatment on the cracks in the road surface, use the slotting machine to expand the cracks and perform local heating treatment on the slotted cracks using heating equipment at a heating temperature of 170-190℃;

[0046] The application type of the potting glue is determined according to the movement of the pavement cracks. When the movement of the cracks is greater than or equal to 6mm, a high-elastic potting glue is used; when the movement of the cracks is 2-6mm, a medium-elastic potting glue is used; when the movement of the cracks is less than or equal to 2mm, a low-elastic potting glue is used. The potting glue is injected into the pavement cracks to fill the filling height no more than 3mm above the original pavement elevation.

[0047] According to the aggregate color information, the type of spreading aggregate is determined by matching in the aggregate color database. The particle size range of the spreading aggregate is selected according to the gradation information of the original pavement asphalt mixture. The selected aggregate is evenly spread on the surface of the potting compound until it is completely covered.

[0048] Use a roller to roll back and forth to spread the aggregate, with the number of rolling times not less than 20 times.

[0049] As a preferred embodiment of the method for laying the potting glue of the present invention, the spreading aggregate is subjected to surface modification treatment, and a nanometer-scale micro-pit structure is formed on the surface of the aggregate by plasma bombardment, with a micro-pit depth of 50-200nm and a density of 10 5 -10 6 Pieces / mm 2 ;

[0050] The micro-pits are pre-filled with thermally stable siloxane oligomers;

[0051] When the aggregate is spread and rolled, a gradient cross-linked layer with a thickness of 2-5 μm is formed at the aggregate-potting compound interface.

[0052] The beneficial effects of this preferred technical solution are: by creating nano-anchoring points through plasma modification and pre-filling compatible oligomers, traditional physical chimera is upgraded to molecular-level chemical bonding, thereby improving the interface bonding strength.

[0053] As a preferred embodiment of the method for laying the potting compound of the present invention, when the aggregate is spread by reciprocating rolling, the rolling temperature in the first stage is 60-80°C, and the rolling is repeated 5-8 times to preheat the aggregate and the potting compound;

[0054] The second stage of rolling is carried out at a temperature of 100-120°C and 8-12 times;

[0055] The third stage of rolling is carried out at a temperature of 120-140°C for 5-8 times;

[0056] A temperature equilibration time of 2-3 minutes was set between each stage, and the temperature deviation was set within the range of ±5°C.

[0057] The beneficial effects of this preferred technical solution are: a three-stage incremental temperature-controlled rolling process is adopted to achieve an orderly reaction process from preheating-activation-cross-linking, ensuring the uniform formation of the gradient cross-linking layer and the stability of the repair quality.

[0058] The beneficial effects of the present invention are:

[0059] The synergistic configuration of the silicone rubber matrix and graded transparent silica achieves a balance between mechanical strength and optical transparency. The fluidity provided by the spherical nano-SiO2 and the light-scattering suppression effect of the mesoporous SiO2 enhance each other, allowing the potting compound to achieve high transparency while maintaining excellent processing properties. This overcomes the significant color difference problem of traditional repair materials. Furthermore, the electron cloud resonance effect of the reduced graphene in the synergistic anti-reflection nanocomposite material, combined with the molecular orientation of the silane coupling layer, creates a gradient refractive index matching under the optical matching of the nano-SiO2 coating. This effect enables the material to achieve optical performance matching according to ambient lighting conditions, seamlessly integrating visually with the original road surface.

[0060] The three-stage incremental temperature-controlled rolling process achieves the coordinated regulation of reaction kinetics and stress release. The progressive temperature treatment of preheating-activation-crosslinking not only ensures the orderly progress of the chemical reaction, but also produces a stress equalization effect. The molecular segment rearrangement and cross-linking network construction in each temperature stage cooperate with each other to eliminate thermal stress concentration, so that the repair area obtains a residual stress distribution that matches the original road surface, and realizes seamless and smooth repair. Specifically, the first stage is used to activate the end group reaction of siloxane oligomers on the aggregate surface, the second stage is used to promote diffusion interpenetration reaction, and the third stage is used to complete the gradient cross-linking network construction. DETAILED DESCRIPTION

[0061] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with specific embodiments of the present invention. It is obvious that the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0062] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0063] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0064] Example 1 discloses a potting compound comprising the following components by weight:

[0065] Silicone rubber matrix: 90 parts, which includes a combination of vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil;

[0066] Graded transparent silica: 15 parts, comprising a combination of spherical nano-SiO2 and mesoporous SiO2, wherein the particle size of the spherical nano-SiO2 is 15 nm and the particle size of the mesoporous SiO2 is 50 nm;

[0067] Silane coupling agent compound system: 0.5 parts, a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltriethoxysilane;

[0068] Multi-stage elasticity regulator: 5 parts, which includes a combination of a low-temperature elasticity agent, a high-temperature elasticity agent and a silicone copolymer;

[0069] Temperature gradient vulcanization system: 0.1 parts, comprising a combination of a platinum complex catalyst and a reaction inhibitor. In this embodiment, the platinum complex catalyst is a platinum-divinyltetramethyldisiloxane complex, and the reaction inhibitor is 1-ethynyl-1-cyclohexanol;

[0070] Synergistic antireflection nanocomposite material: 0.2 parts;

[0071] UV-A benzotriazole derivative: 0.1 part;

[0072] The low-temperature elastomer is vinyl-terminated polysiloxane with a molecular weight of 8000;

[0073] The high temperature elastomer is vinyl-terminated polysiloxane with a molecular weight of 15,000.

[0074] Among them, it is important to know that the preparation steps of the synergistic antireflection nanocomposite material include:

[0075] Graphene oxide was dispersed in anhydrous isopropanol at a concentration of 1 g / L, and ultrasonic dispersion was performed at a power density of 300 W / L for 3 hours to obtain a stable graphene oxide dispersion.

[0076] Add L-ascorbic acid-citric acid composite reducing system to the graphene oxide dispersion, adjust the pH to 6, and heat to 75°C under an inert atmosphere. After reacting for 2 hours, add 3-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane in a molar ratio of 2:1, and continue the reaction for 6 hours.

[0077] After the reaction is completed, the reaction is continued at 75°C for 2 hours to ensure sufficient bonding and cross-linking between the silane molecules and the reduced graphene surface. Ethyl orthosilicate and deionized water are then added dropwise to maintain a weakly acidic pH of 5. A nano-SiO2 coating is in situ generated on the reduced graphene surface by a sol-gel method. The reaction temperature is maintained at 75°C for 4 hours, and the coating thickness is 2 nm.

[0078] The synergistic anti-reflection nanocomposite material is obtained through centrifugal separation, anhydrous ethanol washing and vacuum drying.

[0079] The weight ratio of the platinum complex catalyst to the reaction inhibitor is 1:0.5;

[0080] The weight ratio of spherical nano-SiO2 and mesoporous SiO2 is 1:1;

[0081] The weight ratio of γ-glycidyloxypropyltrimethoxysilane to vinyltriethoxysilane is 2:1.

[0082] Example 2 discloses a potting compound comprising the following components by weight:

[0083] Silicone rubber matrix: 100 parts, which includes a combination of vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil;

[0084] Graded transparent silica: 20 parts, comprising a combination of spherical nano-SiO2 and mesoporous SiO2, wherein the particle size of the spherical nano-SiO2 is 20 nm and the particle size of the mesoporous SiO2 is 65 nm;

[0085] Silane coupling agent compound system: 1 part, a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltriethoxysilane;

[0086] Multi-stage elasticity regulator: 10 parts, which includes a combination of a low-temperature elasticity agent, a high-temperature elasticity agent and a silicone copolymer;

[0087] Temperature gradient vulcanization system: 0.5 parts, which includes a combination of a platinum complex catalyst and a reaction inhibitor;

[0088] Synergistic antireflection nanocomposite material: 0.5 parts;

[0089] UV-A benzotriazole derivative: 0.3 parts;

[0090] The low-temperature elastomer is vinyl-terminated polysiloxane with a molecular weight of 10,000;

[0091] The high temperature elastomer is vinyl-terminated polysiloxane with a molecular weight of 20,000.

[0092] Among them, it is important to know that the preparation steps of the synergistic antireflection nanocomposite material include:

[0093] Graphene oxide was dispersed in anhydrous isopropanol at a concentration of 2 g / L, and ultrasonic dispersion was performed at a power density of 400 W / L for 4 hours to obtain a stable graphene oxide dispersion.

[0094] An L-ascorbic acid-citric acid composite reducing system was added to the graphene oxide dispersion, the pH was adjusted to 6, and the temperature was raised to 80°C under an inert atmosphere. After the reaction was carried out for 2 hours, 3-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane were added at a molar ratio of 2:1, and the reaction was continued for 7 hours.

[0095] After the reaction is completed, the reaction is continued at 80°C for 2 hours to ensure sufficient bonding and cross-linking between the silane molecules and the reduced graphene surface. Ethyl orthosilicate and deionized water are then added dropwise to maintain a weakly acidic pH of 6. A nano-SiO2 coating is in situ generated on the reduced graphene surface by a sol-gel method. The reaction temperature is maintained at 80°C for 5 hours, and the coating thickness is 6 nm.

[0096] The synergistic anti-reflection nanocomposite material is obtained through centrifugal separation, anhydrous ethanol washing and vacuum drying.

[0097] The weight ratio of the platinum complex catalyst to the reaction inhibitor is 1:1;

[0098] The weight ratio of spherical nano-SiO2 and mesoporous SiO2 is 2:1;

[0099] The weight ratio of γ-glycidyloxypropyltrimethoxysilane to vinyltriethoxysilane is 3:1.

[0100] Example 3 discloses a potting compound comprising the following components by weight:

[0101] Silicone rubber matrix: 110 parts, which includes a combination of vinyl-terminated polydimethylsiloxane and hydrogenated silicone oil;

[0102] Graded transparent silica: 25 parts, comprising a combination of spherical nano-SiO2 and mesoporous SiO2, wherein the particle size of the spherical nano-SiO2 is 25 nm and the particle size of the mesoporous SiO2 is 80 nm;

[0103] Silane coupling agent compound system: 2 parts, a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltriethoxysilane;

[0104] Multi-stage elasticity regulator: 15 parts, which includes a combination of a low-temperature elasticity agent, a high-temperature elasticity agent and a silicone copolymer;

[0105] Temperature gradient vulcanization system: 0.8 parts, which includes a combination of a platinum complex catalyst and a reaction inhibitor;

[0106] Synergistic antireflection nanocomposite material: 1 part;

[0107] UV-A benzotriazole derivative: 0.5 parts;

[0108] The low-temperature elastomer is vinyl-terminated polysiloxane with a molecular weight of 12,000;

[0109] The high temperature elastomer is vinyl-terminated polysiloxane with a molecular weight of 25,000.

[0110] Among them, it is important to know that the preparation steps of the synergistic antireflection nanocomposite material include:

[0111] Graphene oxide was dispersed in anhydrous isopropanol at a concentration of 3 g / L, and ultrasonic dispersion was performed at a power density of 500 W / L for 5 hours to obtain a stable graphene oxide dispersion.

[0112] An L-ascorbic acid-citric acid composite reducing system was added to the graphene oxide dispersion, the pH was adjusted to 7, and the temperature was raised to 80°C under an inert atmosphere. After the reaction was carried out for 2 hours, 3-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane were added at a molar ratio of 2:1, and the reaction was continued for 8 hours.

[0113] After the reaction is completed, the reaction is continued at 80°C for 2 hours to ensure sufficient bonding and cross-linking between the silane molecules and the reduced graphene surface. Ethyl orthosilicate and deionized water are then added dropwise to maintain a weakly acidic pH of 6. A nano-SiO2 coating is in situ generated on the reduced graphene surface by a sol-gel method. The reaction temperature is maintained at 80°C for 6 hours, and the coating thickness is 8 nm.

[0114] The synergistic anti-reflection nanocomposite material is obtained through centrifugal separation, anhydrous ethanol washing and vacuum drying.

[0115] The weight ratio of the platinum complex catalyst to the reaction inhibitor is 1:2;

[0116] The weight ratio of spherical nano-SiO2 and mesoporous SiO2 is 2:1;

[0117] The weight ratio of γ-glycidyloxypropyltrimethoxysilane to vinyltriethoxysilane is 4:1.

[0118] In Comparative Example 1, compared with Example 2, the mesoporous SiO2 was removed and only 20 nm spherical nano-SiO2 was used, and the other components were the same as those in Example 2.

[0119] Table 1: Comparative Table of Performance Results of Example 2 and Comparative Example 1

[0120] As shown in Table 1, in the dispersion performance test analysis, the number of agglomerates was counted using microscopic observation, which is an intuitive method for evaluating the dispersion effect of nanofillers. In Example 2, the number of agglomerates was controlled to be below 5 per field of view, while in Comparative Example 1, the number reached 12-15 per field of view. This indicates that when using 20nm spherical nano-SiO2 alone, secondary agglomeration is easily formed due to the strong van der Waals forces between particles and the large specific surface area. The addition of 65nm mesoporous SiO2 in Example 2 played the role of a "dispersion aid", forming physical isolation between nanoparticles and effectively suppressing agglomeration.

[0121] In terms of mechanical properties, the elongation at break test showed that Example 2 reached 385%, a 20% increase from the 320% of Comparative Example 1. This result validates the advantages of the graded filler design. The addition of mesoporous SiO2 not only does not sacrifice the material's flexibility, but also improves the filler dispersion and reduces stress concentration points, allowing the material to withstand greater deformation during stretching without breaking.

[0122] In verifying the optical performance advantage, the optical performance of a 2mm thick sample was tested using the GB / T2410 standard. The transmittance of Example 2 reached 85.2%, an 8.4% increase over the 78.6% of Comparative Example 1, and the haze was reduced from 6.9% to 3.8%, an improvement of 45%. This difference demonstrates the effectiveness of the graded transparent silica design. The addition of mesoporous SiO2 reduces the light scattering effect by reducing the agglomeration of nano-SiO2. At the same time, its own pore structure, under appropriate refractive index matching, can reduce interface reflection, thereby achieving higher transparency and lower haze.

[0123] These test results demonstrate that Example 2, by introducing 65nm mesoporous SiO2 into a graded filler system, successfully overcomes the poor dispersibility inherent in single nano-SiO2, improving optical performance and process stability while maintaining excellent mechanical properties. This synergistic effect validates the technical rationale for the graded transparent silica design and provides an effective technical path for the development of high-performance potting compounds.

[0124] In Comparative Example 2, compared with Example 2, the synergistic antireflection nanocomposite material was removed, and the other components were the same as those in Example 2.

[0125] Table 2: Comparative Table of Performance Results of Example 2 and Comparative Example 2

[0126] According to Table 2, in terms of mechanical properties, the tensile strength of Example 2 reaches 6.8MPa, which is 15% higher than the 5.9MPa of Comparative Example 2, and the tear strength is increased from 24.8kN / m to 28.5kN / m, with an increase of 15%. This shows that the reduced graphene in the synergistic anti-reflection nanocomposite material has played an effective reinforcing role. At the same time, the compression set is reduced from 22.3% to 18.5%, and the resilience is increased from 47% to 52%, which shows that the elastic recovery ability of the material is improved, and the shape stability can be better maintained during long-term use.

[0127] The optical performance improvement achieved by increasing light transmittance from 81.7% to 85.2% is significant for potting applications requiring transparency. More importantly, the refractive index of Example 2 is 1.410, lower than the 1.415 of Comparative Example 2, and closer to the refractive index of the silicone rubber matrix. This matching helps reduce interfacial light scattering and improves overall transparency.

[0128] In terms of aging resistance, after 72 hours of UV irradiation at a wavelength of 340 nm, the strength retention rate of Example 2 reached 92%, while that of Comparative Example 2 was only 86%. This shows that the synergistic anti-reflection nanocomposite material effectively improves the material's UV resistance, which is of great value for applications outdoors or in high-radiation environments.

[0129] In Comparative Example 3, in a temperature gradient vulcanization system, only the platinum complex catalyst was used, the reaction inhibitor was removed, and the other components were the same as those in Example 2.

[0130] Table 3: Comparative Table of Performance Results of Example 2 and Comparative Example 3

[0131] Table 3 shows that in the vulcanization reaction kinetics, due to the removal of the reaction inhibitor, the scorch time in Comparative Example 3 was sharply reduced from 3.8 minutes to 1.5 minutes, a reduction of 61%. The vulcanization time was also reduced from 8.5 minutes to 5.2 minutes, and the vulcanization rate was increased by 39%. Although this excessively fast reaction ostensibly improves production efficiency, it actually poses a huge challenge to process control. Example 2, by adding a reaction inhibitor, controls the vulcanization reaction within a reasonable rate range, providing a sufficient process window for actual production operations.

[0132] In terms of product quality uniformity, Example 2 was only 3.2%, while Comparative Example 3 was as high as 8.7%, a difference of nearly 3 times. The hardness coefficient of variation also deteriorated from 2.8% to 7.4%, an increase of 2.6 times. This significant increase in the coefficient of variation indicates that the rapid vulcanization without a reaction inhibitor leads to an uneven distribution of the crosslinked network, resulting in significant performance differences in different parts of the product. This will become a stress concentration point in actual application, affecting the long-term reliability of the product.

[0133] In terms of comprehensive mechanical properties, while the tensile strength of Comparative Example 3 decreased slightly after rapid vulcanization (from 6.8 MPa to 6.2 MPa), the more significant drop in elongation at break from 385% to 340% indicates a compromise in the material's toughness. The rapid and uncontrolled vulcanization reaction can easily lead to excessive crosslinking, making the material brittle and losing the inherent flexibility of silicone rubber.

[0134] Example 4 provides a multi-stage elasticity regulator. According to the different ratios of the low-temperature elastic agent, the high-temperature elastic agent, and the siloxane copolymer in the multi-stage elasticity regulator, the potting compound is divided into a high-elasticity potting compound, a medium-elasticity potting compound, and a low-elasticity potting compound.

[0135] Among them, the ratio of low-temperature elastic agent, high-temperature elastic agent and silicone copolymer of high-elasticity potting glue is 4:6:1; the ratio of low-temperature elastic agent, high-temperature elastic agent and silicone copolymer of medium-elasticity potting glue is 3:4:1.5; the ratio of low-temperature elastic agent, high-temperature elastic agent and silicone copolymer of low-elasticity potting glue is 2:3:2.

[0136] Different ratios allow you to select the appropriate performance level based on actual needs, avoiding a one-size-fits-all design. For applications that don't require high elasticity, you can choose a low-elasticity type, which reduces the amount of elastomer used while meeting the requirements and achieving cost control.

[0137] Example 5 provides a method for preparing a potting compound, comprising the following steps:

[0138] S1. Vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil were mixed in a weight ratio of 3:1, and stirred at 60° C. for 30 minutes to obtain a silicone rubber matrix;

[0139] The viscosity of the vinyl-terminated polydimethylsiloxane is 1000 mPa·s, and the hydrogen content of the hydrogen-containing silicone oil is 0.15%.

[0140] S2. After mixing spherical nano-SiO2 and mesoporous SiO2, a silane coupling agent compound system is added for surface treatment, and the mixture is reacted at 80°C for 1 hour to obtain modified graded transparent silica.

[0141] S3. Mix the silicone rubber matrix with the modified graded transparent silica, add a multi-stage elasticity regulator, and stir and mix them evenly at room temperature.

[0142] S4. Add the synergistic anti-reflection nanocomposite material and UV-A benzotriazole derivative in sequence, stir and disperse them evenly, and use ultrasonic dispersion.

[0143] S5. Finally, add the temperature gradient vulcanization system, stir quickly to mix evenly, and then degas under vacuum conditions to obtain the potting glue. The degassing pressure is -0.08 MPa and the time is 5 minutes.

[0144] Example 6 provides a method for preparing a potting compound, comprising the following steps:

[0145] S1, vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil are mixed in a weight ratio of 5:1, and stirred at 80° C. for 60 minutes to obtain a silicone rubber matrix;

[0146] The viscosity of the vinyl-terminated polydimethylsiloxane is 5000 mPa·s, and the hydrogen content of the hydrogen-containing silicone oil is 0.25%.

[0147] S2. After mixing spherical nano-SiO2 and mesoporous SiO2, a silane coupling agent compound system is added for surface treatment, and the mixture is reacted at 100°C for 2 hours to obtain modified graded transparent silica.

[0148] S3. Mix the silicone rubber matrix with the modified graded transparent silica, add a multi-stage elasticity regulator, and stir and mix them evenly at room temperature.

[0149] S4. Add the synergistic anti-reflection nanocomposite material and UV-A benzotriazole derivative in sequence, stir and disperse them evenly, and use ultrasonic dispersion.

[0150] S5. Finally, add the temperature gradient vulcanization system, stir quickly to mix evenly, and then degas under vacuum conditions to obtain the potting glue. The degassing pressure is -0.1 MPa and the time is 15 minutes.

[0151] Example 7 provides a method for laying a potting compound, comprising the following steps:

[0152] A1. For the cracks in the road to be repaired, collect the crack movement, aggregate color information and the gradation information of the original asphalt mixture of the road surface.

[0153] It is important to know that the crack movement is the maximum displacement (mm) of a pavement crack within a year, which is provided by the historical maintenance data of the highway management agency;

[0154] Aggregate color information refers to the hue, brightness, and saturation of the aggregate near the crack;

[0155] The asphalt mixture gradation information is the asphalt mixture gradation type of the original pavement where the crack is located.

[0156] A2. Carry out dirt cleaning pretreatment on the road cracks, use a slotting machine to expand and slot the cracks, and use heating equipment to locally heat the slotted cracks at a heating temperature of 170-190℃.

[0157] In the process of expanding and grooving the cracks, the depth-to-width ratio of the crack grooving is 1:1-2.

[0158] A3. Determine the application type of potting glue based on the movement of the pavement cracks. When the movement of the cracks is greater than or equal to 6mm, use a high-elastic potting glue; when the movement of the cracks is 2-6mm, use a medium-elastic potting glue; when the movement of the cracks is less than or equal to 2mm, use a low-elastic potting glue. Inject the potting glue to fill the pavement cracks, and the filling height shall not exceed 3mm of the original pavement elevation.

[0159] A4. Based on the aggregate color information, match the aggregate color database to determine the type of aggregate to be spread. Select the particle size range of the aggregate to be spread based on the gradation information of the original pavement asphalt mixture. Evenly spread the selected aggregate on the surface of the potting compound until it is completely covered.

[0160] It is important to know that the aggregate color database contains the hue, lightness, and saturation of road aggregates.

[0161] The particle size range of the spreading aggregate is shown in Table 4;

[0162] Table 4: Spread aggregate particle size range and mass percentage

[0163] In this implementation, a transverse crack on an asphalt pavement on a highway in a certain province in my country was repaired to achieve a seamless, leveled repair effect. Based on historical highway maintenance data, the movement of the transverse crack was 6.89 mm. The hue, lightness, and saturation of the aggregate near the crack are shown in Table 4. The pavement aggregate type was AC-20.

[0164] Based on the actual situation of this transverse crack, a pretreatment was carried out to clean the dirt within the crack. Based on actual research results, the groove depth-to-width ratio of this transverse crack was 1:1.5. A liquefied gas blowtorch was used to locally heat the grooved crack at 180°C. Based on the amount of crack movement, a highly elastic potting compound was used to seal the transverse crack. Based on the pavement aggregate color information, the best aggregate type matched from the aggregate color database was diabase. The aggregate particle size range for spreading is shown in Table 5.

[0165] Table 5: Spread aggregate particle size range

[0166] A5. Use a roller to roll back and forth to spread the aggregate, with the number of rolls not less than 20 times.

[0167] The surface of the aggregate is modified by plasma bombardment to form a nanometer-scale micro-pit structure on the surface of the aggregate. The depth of the micro-pit is 50-200nm and the density is 10 5 -10 6 Pieces / mm 2 ;

[0168] The micro-pits are pre-filled with thermally stable siloxane oligomers;

[0169] When the aggregate is spread and rolled, a gradient cross-linked layer with a thickness of 2-5 μm is formed at the aggregate-potting compound interface.

[0170] In the embodiment of the present application, when the aggregate is spread by reciprocating rolling, the rolling temperature in the first stage is 60-80°C, preferably 70°C, and the rolling is performed 5-8 times to preheat the aggregate and the potting compound;

[0171] The second stage rolling temperature is 100-120℃, preferably 110℃, and rolling is performed 8-12 times;

[0172] The third stage of rolling is carried out at a temperature of 120-140°C, preferably 130°C, for 5-8 times;

[0173] A temperature equilibration time of 2-3 minutes was set between each stage, and the temperature deviation was set within the range of ±5°C.

[0174] Finally, a 3m straight ruler is used to measure the bidirectional flatness of the repaired crack along the longitudinal and transverse directions of the road surface. The measurement calculation formula is expressed as:

[0175] ;

[0176] Where, is the maximum gap along the crack direction, is the maximum gap perpendicular to the crack direction.

[0177] Preferably, the bidirectional flatness measurement result should not exceed 1 cm.

[0178] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the present invention.

Claims

1. A potting compound, characterized in that: It contains the following components by weight: Silicone rubber matrix: 90-110 parts, which includes a combination of vinyl-terminated polydimethylsiloxane and hydrogen-containing silicone oil; Graded transparent silica: 15-25 parts, which includes a combination of spherical nano-SiO2 and mesoporous SiO2; Silane coupling agent compound system: 0.5-2 parts, a combination of γ-glycidyloxypropyltrimethoxysilane and vinyltriethoxysilane; Multi-stage elasticity regulator: 5-15 parts, which includes a combination of low-temperature elasticity agent, high-temperature elasticity agent and silicone copolymer; Temperature gradient vulcanization system: 0.1-0.8 parts, which includes a combination of a platinum complex catalyst and a reaction inhibitor; Synergistic antireflection nanocomposite material: 0.2-1 part; UV-A benzotriazole derivative: 0.1-0.5 parts; The low-temperature elastic agent is vinyl-terminated polysiloxane with a molecular weight of 8000-12000; The high-temperature elastic agent is vinyl-terminated polysiloxane with a molecular weight of 15,000-25,000.

2. The potting compound according to claim 1, wherein: The particle size of the spherical nano-SiO2 is 15-25nm; The particle size of the mesoporous SiO2 is 50-80 nm.

3. The potting compound according to claim 2, wherein: The preparation steps of the synergistic anti-reflection nanocomposite material include: Dispersing graphene oxide in anhydrous isopropanol at a concentration of 1-3 g / L, ultrasonically dispersing at a power density of 300-500 W / L for 3-5 hours to obtain a stable graphene oxide dispersion; Add L-ascorbic acid-citric acid composite reducing system to the graphene oxide dispersion, adjust the pH to 6-7, raise the temperature to 75-80°C under an inert atmosphere, react for 2 hours, then add 3-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane in a molar ratio of 2:1, and continue the reaction for 6-8 hours; After the reaction is completed, the reaction is continued at 75-80°C for 2-3 hours to fully bond and crosslink the silane molecules with the reduced graphene surface, and ethyl orthosilicate and deionized water are added dropwise to maintain a weakly acidic pH of 5-6. A nano-SiO2 coating is in situ generated on the reduced graphene surface by a sol-gel method. The reaction temperature is maintained at 75-80°C for 4-6 hours, and the coating thickness is 2-8 nm. The synergistic anti-reflection nanocomposite material is obtained by centrifugal separation, anhydrous ethanol washing and vacuum drying.

4. The potting compound according to claim 3, wherein: The weight ratio of the platinum complex catalyst to the reaction inhibitor is 1:0.5-2; The weight ratio of the spherical nano-SiO2 to the mesoporous SiO2 is 1-2:1; The weight ratio of the γ-glycidyloxypropyltrimethoxysilane to vinyltriethoxysilane is 2-4:

1.

5. The potting compound according to claim 4, wherein: According to the different ratios of the low-temperature elastic agent, the high-temperature elastic agent and the siloxane copolymer in the multi-stage elasticity regulator, the potting compound is divided into a high-elasticity potting compound, a medium-elasticity potting compound and a low-elasticity potting compound; The ratio of the low-temperature elastic agent, the high-temperature elastic agent and the siloxane copolymer of the high-elastic potting compound is 4:6:

1. The ratio of the low-temperature elastic agent, high-temperature elastic agent and silicone copolymer of the medium-bullet type potting adhesive is 3:4:1.5; The low-elasticity potting compound has a low-temperature elastic agent, a high-temperature elastic agent and a silicone copolymer in a ratio of 2:3:

2.

6. A method for preparing the potting compound according to any one of claims 1 to 5, characterized in that: The following steps are involved: Mix vinyl-terminated polydimethylsiloxane and hydrogenated silicone oil in a weight ratio of 3-5:1, and stir at 60-80° C. for 30-60 minutes to obtain a silicone rubber matrix; After mixing spherical nano-SiO2 and mesoporous SiO2, adding a silane coupling agent compound system for surface treatment, reacting at 80-100°C for 1-2 hours to obtain modified graded transparent silica; Mix the silicone rubber matrix with modified graded transparent silica, add a multi-grade elasticity regulator, and stir and mix evenly at room temperature; Add the synergistic antireflection nanocomposite and UV-A benzotriazole derivative in sequence, stir and disperse evenly; Finally, the temperature gradient vulcanization system is added, and after rapid stirring and mixing, degassing is performed under vacuum conditions to obtain the potting glue.

7. The method for preparing the potting compound according to claim 6, wherein: The viscosity of the vinyl-terminated polydimethylsiloxane is 1000-5000 mPa·s, and the hydrogen content of the hydrogenated silicone oil is 0.15-0.25%; The synergistic anti-reflection nanocomposite material is dispersed by ultrasound; The degassing treatment is performed at a pressure of -0.08 to -0.1 MPa and for a time of 5 to 15 minutes.

8. A method for laying the potting compound according to any one of claims 1 to 5, characterized in that: The following steps are involved: For cracks in the road to be repaired, collect information on crack movement, aggregate color, and gradation of the original asphalt mixture; Carry out dirt cleaning pretreatment on the cracks in the road surface, use the slotting machine to expand the cracks and perform local heating treatment on the slotted cracks using heating equipment at a heating temperature of 170-190℃; The application type of the potting glue is determined according to the movement of the pavement cracks. When the movement of the cracks is greater than or equal to 6mm, a high-elastic potting glue is used; when the movement of the cracks is 2-6mm, a medium-elastic potting glue is used; when the movement of the cracks is less than or equal to 2mm, a low-elastic potting glue is used. The potting glue is injected into the pavement cracks to fill the filling height no more than 3mm above the original pavement elevation. According to the aggregate color information, the type of spreading aggregate is determined by matching in the aggregate color database. The particle size range of the spreading aggregate is selected according to the gradation information of the original pavement asphalt mixture. The selected aggregate is evenly spread on the surface of the potting compound until it is completely covered. Use a roller to roll back and forth to spread the aggregate, with the number of rolling times not less than 20 times.

9. The method for laying the potting compound according to claim 8, wherein: The spreading aggregate is subjected to surface modification treatment, and a nanometer-scale micro-pit structure is formed on the aggregate surface by plasma bombardment. The micro-pit depth is 50-200nm and the density is 10 5 -10 6 Pieces / mm 2 ; The micro-pits are pre-filled with thermally stable siloxane oligomers; When the aggregate is spread and rolled, a gradient cross-linked layer with a thickness of 2-5 μm is formed at the aggregate-potting compound interface.

10. The method for laying the potting compound according to claim 9, wherein: When the aggregate is spread by reciprocating rolling, the rolling temperature in the first stage is 60-80°C, and the rolling is performed 5-8 times to preheat the aggregate and the potting compound; The second stage of rolling is carried out at a temperature of 100-120°C and 8-12 times; The third stage of rolling is carried out at a temperature of 120-140°C for 5-8 times; A temperature equilibration time of 2-3 minutes was set between each stage, and the temperature deviation was set within the range of ±5°C.

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