Heat-aging-resistant double-component silane modified polyether-based sealant and preparation method thereof

Abstract

The invention belongs to the technical field of polyether sealants, and particularly relates to a heat-aging-resistant bi-component silane modified polyether-based sealant and a preparation method thereof. The sealant comprises a component A and a component B in a mass ratio of 1: (0.8-1A), wherein the component A comprises the following raw materials in parts by mass: 70-80 parts of silane modified polyether, 20-30 parts of a silane modified polyimide derivative, 20-40 parts of a plasticizer, 100-120 parts of filler and 1-3 parts of a light stabilizer; the silane-modified polyimide derivative is prepared by the following steps: reacting diamino polyethylene glycol with a phthalic anhydride compound to generate an amino-terminated polyamide acid derivative, carrying out chemical cyclization on the amino-terminated polyamide acid derivative to prepare an amino-terminated polyimide derivative, and modifying the amino-terminated polyimide derivative by using an isocyanate-based silane coupling agent. The number-average molecular weight of the amino-terminated polyimide derivative is 3000 to 5200; the component B comprises the following raw materials in parts by mass: 1-3 parts of a cross-linking agent, 1-2 parts of a catalyst, 80-100 parts of a plasticizer, 5-10 parts of a thixotropic agent and 80-100 parts of filler. The sealant provided by the invention has excellent thermal aging resistance and curing performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of polyether sealant, and particularly relates to a heat-resistant and aging-resistant two-component silane-modified polyether-based sealant and a preparation method thereof. BACKGROUND

[0002] Sealant is a material with double functions of bonding and sealing. According to the type of base polymer, it mainly includes polysulfide (PS) sealant, silicone (SR) sealant, polyurethane (PU) sealant and silane-modified polyether (MS) sealant. Among them, the silane-modified polyether sealant is prepared by adding plasticizers, fillers, coupling agents, catalysts and other additives based on short silane-based polyether prepolymer, and is an environmentally friendly material with excellent comprehensive performance. It not only has high elasticity, flexibility, excellent adhesion and coatability, but also has good storage stability, no substrate pollution and other characteristics, and is widely used in industrial fields such as fabricated buildings, transportation, home decoration and aerospace. For example, a two-component silane-modified polyether sealant and a preparation method thereof are disclosed in patent CN114958267B. The sealant includes component A and component B. Component A includes, by weight fraction: base resin 50-100 parts; mercaptoalkoxy silane-modified polyether resin 10-50 parts; first plasticizer 5-80 parts; hollow glass microbeads 50-100 parts, and not 0; reinforcing filler 1-20 parts; light stabilizer 0.5-5 parts. Component B includes, by weight fraction: second plasticizer 5-80 parts; carbon black 0.5-10 parts; coupling agent 1.0-10 parts; first catalyst 0.1-10 parts. A high-performance flame-retardant two-component silane-modified polyether sealant and a preparation method thereof are disclosed in patent CN106833478B. It is divided into component A and component B. The mass percentage of component A is: MS polymer 40-80%, water removal agent 0-4%, crosslinking agent 0-4%, reinforcing filler 10-50%, catalyst 0.1-2%. The mass percentage of component B is: MS polymer 30-60%, plasticizer 8-30%, coupling agent 0.2-3%, water 1-10%, flame-retardant filler 20-60%. The above is a common two-component silane-modified polyether sealant, which has excellent adhesion, aging resistance, flame retardance and construction adaptability, etc. However, the silane-modified polyether sealant has weak thermal stability, and is prone to performance degradation when used for a long time under high temperature conditions: the molecular main chain is an organic polyether chain composed of C-C bonds and C-O bonds with low bond energy, which is prone to chain rupture and oxidation reaction under the joint action of heat and oxygen, resulting in degradation of the polymer network, softening of the glue layer, decrease of the elastic recovery rate, attenuation of the bonding strength, and even cracking and powdering. This characteristic makes it difficult to serve for a long time under high temperature conditions, such as the environment of sustained high temperature around the engine, high-temperature pipelines and industrial furnaces, and the aging process of the glue layer will be significantly accelerated, resulting in a significant reduction in the service life and inability to guarantee the long-term sealing reliability and bonding stability.

[0003] Therefore, it is necessary to develop a two-component silane modified polyether sealant with excellent heat aging resistance to expand its application range. SUMMARY

[0004] To solve the above technical problems, the application provides a heat aging resistant two-component silane modified polyether-based sealant and a preparation method thereof. The application first reacts diamino polyethylene glycol with a benzene dianhydride compound to generate an amino-terminated polyamide acid derivative, chemically cyclizes the amino-terminated polyamide acid derivative to generate an amino-terminated polyimide derivative, and modifies the amino-terminated polyimide derivative with an isocyanate silane coupling agent to generate a silane modified polyimide derivative. The silane modified polyimide derivative containing an imide five-membered ring structure is used to replace part of the silane modified polyether in the sealant. The imide five-membered ring and the adjacent benzene ring structure have good heat resistance, and are rigid segments, which are difficult to rotate in the molecular chain and limit the movement of the segments, can keep stable at high temperature, and further prevent or delay the thermal oxidative degradation of the polyether segment, thereby improving the heat aging resistance.

[0005] To achieve the above object, the following technical scheme is adopted:

[0006] A heat aging resistant two-component silane modified polyether-based sealant, comprising A and B components in a mass ratio of 1:0.8-1, wherein the A component comprises the following raw materials in parts by mass: 70-80 parts of a silane modified polyether, 20-30 parts of a silane modified polyimide derivative, 20-40 parts of a plasticizer, 100-120 parts of a filler, and 1-3 parts of a light stabilizer; the silane modified polyimide derivative is generated by reacting diamino polyethylene glycol with a benzene dianhydride compound to generate an amino-terminated polyamide acid derivative, chemically cyclizing the amino-terminated polyamide acid derivative to generate an amino-terminated polyimide derivative, and modifying the amino-terminated polyimide derivative with an isocyanate silane coupling agent; the number average molecular weight of the amino-terminated polyimide derivative is 3000-5200; the silane modified polyether is a prepolymer with a macromolecular polyether chain as a backbone and hydrolysable siloxane groups connected to both ends; and the B component comprises the following raw materials in parts by mass: 1-3 parts of a crosslinking agent, 1-2 parts of a catalyst, 80-100 parts of a plasticizer, 5-10 parts of a thixotropic agent, and 80-100 parts of a filler.

[0007] The molar ratio of the diamino polyethylene glycol to the benzene dianhydride compound is 1.07-1.12:1, and the molar ratio of the amino-terminated polyimide derivative to the isocyanate silane coupling agent is 1:2.1-2.4.

[0008] The average molecular weight of the bis-amino polyethylene glycol is 200-500. The bis-amino polyethylene glycol is selected from one or more than two combinations of decaglycol diamine, nonaglycol diamine, octaglycol diamine, heptaglycol diamine, hexaglycol diamine, pentaglycol diamine, tetraglycol diamine, and triglycol diamine. The flexible polyethylene glycol segment in the bis-amino polyethylene glycol not only ensures that the silane-modified polyimide derivative has good flexibility, elongation, and bonding properties to various substrates, but also enables the silane-modified polyimide derivative to have good compatibility with the silane-modified polyether.

[0009] The phthalic anhydride compound is selected from one or more than two combinations of pyromellitic dianhydride, 4,4'-oxydiphthalic anhydride, 3,4'-oxydiphthalic anhydride, 3,3',4,4'-diphenyltetracarboxylic dianhydride, and 2,3,3',4'-diphenyltetracarboxylic dianhydride, and is preferably 3,3',4,4'-diphenyltetracarboxylic dianhydride.

[0010] The isocyanate-based silane coupling agent is selected from one or more than two combinations of propyl triethoxysilane isocyanate, 10-isocyanatodecyl trimethoxysilane, 3-isocyanate propyl trimethoxysilane, 3-isocyanate propyl methyl diethoxysilane, and methyl-(3-isocyanate propyl) dimethyl silane.

[0011] The silane-modified polyimide derivative is prepared by a method comprising the following steps:

[0012] 1) Dissolve the bis-amino polyethylene glycol in a solvent, add the phthalic anhydride compound for the first reaction, obtain an amino-terminated polyimide acid derivative solution, add a catalyst and a dehydrating agent to the polyether amic acid derivative solution, mix well, and then perform the second reaction to obtain an amino-terminated polyimide derivative;

[0013] 2) Dissolve the amino-terminated silane-modified polyimide derivative in a solvent, add the isocyanate-based silane coupling agent, mix well, and then perform the reaction to obtain the silane-modified polyimide derivative.

[0014] In step 1), the solvent is selected from one or more than two combinations of N,N-dimethylacetamide, N-methylpyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide. The first reaction condition is under inert atmosphere, 0-5℃, reaction for 4-6h. The dianhydride compound is added in 1-3 times. The catalyst is selected from one or more than two combinations of triethylamine, pyridine, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N',N'-tetramethylalkylene diamine. The dehydrating agent is selected from one or more than two combinations of acetic anhydride, phthalic anhydride, trifluoroacetic anhydride. The molar ratio of the catalyst, dehydrating agent and dianhydride compound is 1-4:2-8:1. The second reaction condition is under inert atmosphere, 30-50℃, reaction for 8-12h. After the reaction, the following post-treatment operations are included: adding isopropyl alcohol until no sticky substance is produced, discarding the supernatant, washing the precipitate with isopropyl alcohol for 1-3 times, and drying the obtained sticky substance at 0.01-0.08MPa, 40-60℃ for 12-24h.

[0015] In step 2), the solvent is selected from one or more than two combinations of N,N-dimethylacetamide, N-methylpyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide. The reaction condition is under inert atmosphere, 60-80℃, reaction for 4-6h. After the reaction, the following operations are included: adding hexane until no sticky substance is produced, washing with hexane for 1-3 times, and drying at 40-60℃, 0.01-0.09MPa for 24-48h.

[0016] The silane-modified polyether has a viscosity of 10-40kmpa·s at 25℃, preferably 15-20kmpa·s.

[0017] Although the imide five-membered ring and adjacent benzene ring structure in the silane-modified polyimide derivative are beneficial to improve the heat resistance of the sealant, they limit the chain segment movement and hinder the diffusion of moisture in the colloid, affecting the deep curing of the sealant. By selecting a silane-modified polyether with medium and low viscosity, adjusting the molar ratio of the raw materials for preparing the polyimide derivative and the molecular weight of the raw materials, and the amount of the silane-modified polyether, the performance of the sealant can be improved without significantly reducing the deep curing speed: the silane-modified polyether with medium and low viscosity forms a continuous phase, ensuring the effective diffusion channel of moisture in the colloid; by adjusting the amount and molecular weight of the polyimide derivative, the performance of the sealant can be enhanced without hindering the penetration of moisture due to the limitation of chain segment movement and excessive cross-linking density, thereby ensuring that the deep curing speed does not decrease significantly.

[0018] In a preferred technical solution of the present application, the silane-modified polyether is EXCESTARS 888E and / or EXCESTARS 2420E of Asahi Kasei. It has a suitable viscosity and is suitable for the present application as a raw material of the heat-aging-resistant two-component silane-modified polyether-based sealant.

[0019] The plasticizer is selected from one or a combination of two or more of diisononyl phthalate, diisooctyl phthalate, diisodecyl phthalate, and diethyl phthalate.

[0020] The filler has an average particle size of 20-120 nm and is selected from one or a combination of two or more of calcium carbonate, silicon powder, carbon black, and aluminum oxide.

[0021] The light stabilizer is selected from one or a combination of two or more of a benzotriazole-based light stabilizer, a benzophenone-based light stabilizer, and a hindered amine-based light stabilizer.

[0022] The crosslinking agent is selected from one or a combination of two or more of methyl triethoxysilane, methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate, hexamethyldisilazane, and vinyltrimethoxysilane.

[0023] The catalyst is selected from one or a combination of two or more of dibutyltin dilaurate, di-n-octyltin dilaurate, dibutyltin diacetate, dibutyltin bis(acetylacetate), and stannous octoate.

[0024] The thixotropic agent is selected from one or a combination of two or more of fumed silica and modified hydrogenated castor oil.

[0025] The present application also provides a preparation method of the heat-aging-resistant two-component silane-modified polyether-based sealant described above, which comprises the following steps:

[0026] S1: uniformly mixing the silane-modified polyether, the silane-modified polyimide derivative, the plasticizer, the filler, and the light stabilizer, discharging, and obtaining component A;

[0027] S2: uniformly mixing the crosslinking agent, the catalyst, the plasticizer, the thixotropic agent, and the filler, dehydrating, discharging, and obtaining component B.

[0028] In step S1, the uniform mixing at an elevated temperature is performed in a double-planetary dynamic mixer at a vacuum degree of 0.08-0.1 MPa and a temperature of 100-140℃, with a stirring speed of 800-1500 rpm for 30-90 min. The discharging is performed by cooling to 25-50℃ and unloading under vacuum.

[0029] The mixing in step S2 is stirring at 300-800 rpm for 30-60 min. The dehydration is at 100-120℃, vacuum degree 0.07-0.095 MPa, and dehydrating for 15-30 min. The discharging is cooling to 25-50℃ and discharging under vacuum.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] Firstly, the present application uses diamino polyethylene glycol to react with benzene dianhydride compounds to generate amino-terminated polyimide acid derivatives, and then uses chemical cyclization to generate amino-terminated polyimide derivatives, and then uses isocyanate silane coupling agent to modify the amino-terminated polyimide derivatives to generate a silane-modified polyimide derivative. The silane-modified polyimide derivative containing imide five-membered ring structure is used to replace part of the silane-modified polyether in the sealant. The imide five-membered ring and the adjacent benzene ring structure have good heat resistance, and are rigid segments, which are difficult to rotate in the molecular chain, limit the movement of the segments, can keep the structure stable at high temperature, and further prevent or delay the thermal oxidative degradation of the polyether segment, thereby improving the heat aging resistance.

[0032] Secondly, the present application realizes performance improvement while ensuring that the deep curing speed does not decrease significantly through the synergistic effect of the medium-low viscosity silane-modified polyether and the polyimide derivative. The medium-low viscosity silane-modified polyether forms a continuous phase to ensure the effective diffusion channel of water in the colloid. By adjusting the addition amount and molecular weight of the polyimide derivative, the performance is enhanced, and the penetration of moisture is not hindered due to the limitation of segment movement and excessive cross-linking density, so that the deep curing speed does not decrease significantly. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with specific examples, but is not limited to the contents of the description. Unless otherwise specified, the "parts" in the examples of the present application are all weight parts. The reagents used are commercially available reagents in the art.

[0034] The calcium carbonate has an average particle size of 20 nm and is from Beijing Deke Island Gold Technology Co., Ltd.

[0035] The silane-modified polyether EXCESTARS 888E has a viscosity of 20,000 at 25℃ and is from Asahi Glass.

[0036] The silane-modified polyether EXCESTARS 2420E has a viscosity of 15,000 at 25℃ and is from Asahi Glass.

[0037] The silane-modified polyether EXCESTARS 2410E has a viscosity of 13,000 at 25℃ and is from Asahi Glass.

[0038] Silane modified polyether RISUN 30000T, viscosity 40,000 at 25℃, from Taizhou Ru Yang Laitai New Material Technology Co., Ltd.

[0039] Example 1

[0040] 1) Dissolve 1.12 mol of octaethylene glycol diamine in 6 L of N-methylpyrrolidone, add 0.5 mol of 3,3',4,4'-biphenyl tetracarboxylic dianhydride, react for 1 h under a nitrogen atmosphere at 5℃, then add 0.5 mol of 3,3',4,4'-biphenyl tetracarboxylic dianhydride and continue to react for 3 h, to obtain an amino-terminated polyamide acid derivative solution, add 3 mol of triethylamine and 5 mol of acetic anhydride to the polyether amic acid derivative solution and mix well, then react for 8 h under a nitrogen atmosphere at 50℃, after the reaction is completed, add isopropyl alcohol until no sticky substance is produced, discard the supernatant, wash the precipitate with isopropyl alcohol 3 times, and dry the obtained sticky substance at 0.02 MPa and 60℃ for 24 h to obtain an amino-terminated polyimide derivative (number average molecular weight is 4370 by GPC method).

[0041] 2) Dissolve 1 mol of the amino-terminated silane modified polyimide derivative in 14 L of DMF, add 2.4 mol of 3-isocyanate propyl trimethoxysilane and mix well, then react for 4 h under a nitrogen atmosphere at 80℃, add hexane until no sticky substance is produced, wash with hexane 3 times, and dry at 40℃ and 0.02 MPa for 24 h to obtain a silane modified polyimide derivative.

[0042] 3) Mix 70 kg of silane modified polyether EXCESTARS 888E, 30 kg of the silane modified polyimide derivative, 40 kg of diethyl phthalate, 100 kg of calcium carbonate, and 3 kg of benzotriazole light stabilizer UV-326 in a double planetary dynamic mixer under a vacuum of 0.08 MPa at 140℃ with a stirring speed of 1200 rpm for 30 min, cool to 25℃, and discharge the material after the vacuum is released to obtain component A;

[0043] 4) Mix 2 kg of crosslinking agent methyl triethoxysilane, 2 kg of catalyst dibutyl tin diacetate, 80 kg of diethyl phthalate, 10 kg of thixotropic agent Wacker N20, and 80 kg of calcium carbonate in a stirring speed of 300 rpm for 60 min, dehydrate at 120℃ under a vacuum of 0.07 MPa for 30 min, cool to 25℃, and discharge the material after the vacuum is released to obtain component B.

[0044] 5) When used, mix components A and B in equal mass.

[0045] Example 2

[0046] The rest is the same as example 1, except that in step 1), equimolar amount of decaethylene glycol diamine is used to replace octaethylene glycol diamine. (Number average molecular weight is 4970)

[0047] Example 3

[0048] The rest is the same as Example 1, except that in step 1), 3,6,9-trioxaundecane-1,11-diamine is used instead of octaethylene glycol diamine in an equimolar amount. (The number average molecular weight is 3165)

[0049] Example 4

[0050] The rest is the same as Example 1, except that in step 1), 3,6,9-trioxaundecane-1,11-diamine is used instead of octaethylene glycol diamine in an equimolar amount. (The number average molecular weight is 3165)

[0051] Example 5

[0052] The rest is the same as Example 1, except that in step 3), EXCESTARS 2420E is used instead of EXCESTARS 888E in an equal amount.

[0053] Example 6

[0054] The rest is the same as Example 1, except that in step 3), the amount of silane-modified polyimide derivative is 20 parts by mass.

[0055] Example 7

[0056] 1) Dissolve 1.07 mol of octaethylene glycol diamine in 6L of N-methylpyrrolidone, add 0.5 mol of 3,3',4,4'-biphenyl tetracarboxylic dianhydride, and react for 1 h at 5°C under a nitrogen atmosphere, then add 0.5 mol of 3,3',4,4'-biphenyl tetracarboxylic dianhydride and continue to react for 3 h, to obtain an amino-terminated polyamide acid derivative solution. Add 3 mol of triethylamine and 5 mol of acetic anhydride to the polyether amide acid derivative solution, mix well, and then react for 8 h at 50°C under a nitrogen atmosphere. After the reaction is complete, add isopropyl alcohol until no sticky material is produced, pour off the supernatant, wash the precipitate with isopropyl alcohol three times, and then dry the obtained sticky material at 0.02 MPa and 60°C for 24 h to obtain an amino-terminated polyimide derivative. (The number average molecular weight is 5200)

[0057] 2) Dissolve 1 mol of the amino-terminated silane-modified polyimide derivative in 14L of DMF, add 2.4 mol of 3-isocyanatepropyltrimethoxysilane, mix well, and then react for 4 h at 80°C under a nitrogen atmosphere. Add hexane until no sticky material is produced, wash with hexane three times, and then dry at 40°C and 0.02 MPa for 24 h to obtain a silane-modified polyimide derivative.

[0058] 3) 80 kg of silane-modified polyether EXCESTARS 888E, 20 kg of silane-modified polyimide derivative, 30 kg of diethyl phthalate, 100 kg of calcium carbonate, 3 kg of benzotriazole light stabilizer UV-326 were mixed uniformly in a double-planet dynamic mixer under the conditions of 0.08 MPa vacuum degree and 140°C with stirring at 1200 rpm for 30 min, cooled to 25°C, and discharged after vacuum release to obtain component A;

[0059] 4) 3 kg of crosslinking agent methyl triethoxysilane, 2 kg of catalyst dibutyl tin diacetate, 100 kg of diethyl phthalate, 10 kg of thixotropic agent Wacker N20, and 100 kg of calcium carbonate were mixed uniformly with stirring at 300 rpm for 60 min, dehydrated at 120°C under 0.07 MPa vacuum degree for 30 min, cooled to 25°C, and discharged after vacuum release to obtain component B.

[0060] 5) When used, components A and B were mixed in a mass ratio of 1:0.8.

[0061] Example 8

[0062] The rest was the same as in Example 1, except that in step 3), EXCESTARS 2410E was used instead of EXCESTARS 888E in equal mass.

[0063] Example 9

[0064] The rest was the same as in Example 1, except that in step 3), RISUN 30000T was used instead of EXCESTARS 888E in equal mass.

[0065] Comparative Example 1

[0066] 1) 100 kg of silane-modified polyether EXCESTARS 888E, 40 kg of diethyl phthalate, 100 kg of calcium carbonate, and 3 kg of benzotriazole light stabilizer UV-326 were mixed uniformly in a double-planet dynamic mixer under the conditions of 0.08 MPa vacuum degree and 140°C with stirring at 1200 rpm for 30 min, cooled to 25°C, and discharged after vacuum release to obtain component A;

[0067] 2) 2 kg of crosslinking agent methyl triethoxysilane, 2 kg of catalyst dibutyl tin diacetate, 80 kg of diethyl phthalate, 10 kg of thixotropic agent Wacker N20, and 80 kg of calcium carbonate were mixed uniformly with stirring at 300 rpm for 60 min, dehydrated at 120°C under 0.07 MPa vacuum degree for 30 min, cooled to 25°C, and discharged after vacuum release to obtain component B.

[0068] 3) When used, components A and B were mixed in equal mass. That is, there was no silane-modified polyimide derivative in component A.

[0069] The sealants prepared in the above examples and comparative examples were subjected to the following performance tests:

[0070] Tack-free time was determined according to GB / T 13477.5-2002 "Test methods for building seals Part 5: Determination of tack-free time".

[0071] Curing depth: The test was performed in accordance with the test method for determining the curing degree of sealant in standard GB / T 32369-2015.

[0072] Tensile properties: An electronic universal testing machine was used to determine the tensile stress-strain properties of vulcanized rubber or thermoplastic rubber in accordance with GB / T 528-2009. Standard test pieces were prepared in accordance with the standard HB 5246-1993, and the test pieces were placed in an electrically heated constant temperature drying oven and placed in an environment with a temperature of (25+2)℃ and a relative humidity of (55+5)% RH for 7 days, then removed and punched into dumbbell-shaped samples using a punching machine.

[0073] Heat aging test: The tensile property sample was placed in a blowing drying oven at 140℃ for 21 days in accordance with the standard GB / T 16776-2025 Silicone structural sealant for buildings, and the tensile strength loss rate after heat aging was calculated.

[0074] Table 1 Performance test results

[0075]

[0076] As can be seen from Table 1, the sealant prepared in the present application has excellent heat aging resistance (the tensile strength loss rate is significantly lower), and at the same time, the best balance between curing depth and heat aging resistance is achieved.

[0077] The above detailed description is a specific description of one of the feasible embodiments of the present application, and this embodiment is not used to limit the patent scope of the present application. Any equivalent implementation or change that does not deviate from the present application should be included in the scope of the technical solutions of the present application.

Claims

1. A heat-resistant, aging-resistant two-component silane-modified polyether-based sealant, characterized in that, The product comprises two components, A and B, in a mass ratio of 1:0.8-1. Component A includes the following raw materials in parts by mass: 70-80 parts silane-modified polyether, 20-30 parts silane-modified polyimide derivative, 20-40 parts plasticizer, 100-120 parts filler, and 1-3 parts light stabilizer. The silane-modified polyimide derivative is prepared by reacting diamino polyethylene glycol with phthalic anhydride compounds to generate an amino-terminated polyamic acid derivative, which is then chemically cyclized to obtain an amino-terminated polyimide derivative, which is then modified with an isocyanate-based silane coupling agent. The number average molecular weight of the amino-terminated polyimide derivative is 3000-5200. Component B includes the following raw materials in parts by mass: 1-3 parts crosslinking agent, 1-2 parts catalyst, 80-100 parts plasticizer, 5-10 parts thixotropic agent, and 80-100 parts filler.

2. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 1, characterized in that, The molar ratio of the diamino polyethylene glycol to the phthalic anhydride compound is 1.07-1.12:1, and the molar ratio of the terminal amino polyimide derivative to the isocyanate-based silane coupling agent is 1:2.1-2.

4.

3. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 1, characterized in that, The bis(amino) polyethylene glycol has an average molecular weight of 200-500; the bis(amino) polyethylene glycol is selected from one or more of decaethylene glycol diamine, nonaethylene glycol diamine, octaethylene glycol diamine, heptaethylene glycol diamine, hexaethylene glycol diamine, pentaethylene glycol diamine, tetraethylene glycol diamine, and triethylene glycol diamine; the phthalic anhydride compound is selected from one or more of pyromellitic dianhydride, 4,4'-oxophthalic anhydride, 3,4'-oxophthalic anhydride, 3,3',4,4'-biphenyltetracarboxylic anhydride, and 2,3,3',4'-biphenyltetracarboxylic anhydride, preferably 3,3',4,4'-biphenyltetracarboxylic anhydride.

4. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 1, characterized in that, The isocyanate-based silane coupling agent is selected from one or more combinations of propyltriethoxysilane, 10-isocyanodecyltrimethoxysilane, 3-isocyanate-propyltrimethoxysilane, 3-isocyanate-propylmethyldiethoxysilane, and methyl-(3-isocyanate-propyl)dimethylsilane.

5. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 1, characterized in that, The silane-modified polyether has a viscosity of 10,000-40,000 mPa·s at 25°C, preferably 15,000-20,000 mPa·s; the crosslinking agent is selected from one or more combinations of methyltriethoxysilane, methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate, hexamethyldisilazane, and vinyltrimethoxysilane.

6. The silane-modified polyimide derivative is prepared by a method comprising the following steps: 1) Dissolve diamino polyethylene glycol in a solvent, add phthalic anhydride compounds for the first reaction, and obtain a terminal amino polyamic acid derivative solution. Add a catalyst and dehydrating agent to the polyether amic acid derivative solution, mix well, and then react for the second reaction to obtain a terminal amino polyimide derivative. 2) The amino-terminated silane-modified polyimide derivative is dissolved in a solvent, and an isocyanate-based silane coupling agent is added and mixed to react, thus obtaining the silane-modified polyimide derivative.

7. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 6, characterized in that, In step 1), the first reaction conditions are: under an inert atmosphere, at 0-5°C, for 4-6 hours; the phenyl dianhydride compound is added in 1-3 portions; the second reaction conditions are: under an inert atmosphere, at 30-50°C, for 8-12 hours.

8. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 6, characterized in that, In step 1), the catalyst is selected from one or more of triethylamine, pyridine, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, and N,N,N',N'-tetramethylalkylene diamine; the dehydrating agent is selected from one or more of acetic anhydride, phthalic anhydride, and trifluoroacetic anhydride; and the molar ratio of the catalyst, dehydrating agent, and phthalic anhydride compound is 1-4:2-8:

1.

9. The heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to claim 6, characterized in that, In step 2), the reaction conditions are: under an inert atmosphere, at 60-80°C, for 4-6 hours.

10. A method for preparing the heat-resistant aging-resistant two-component silane-modified polyether-based sealant according to any one of claims 1-9, characterized in that, Includes the following steps: S1 mixes silane-modified polyether, silane-modified polyimide derivative, plasticizer, filler, and light stabilizer, and discharges the mixture to obtain component A; S2 mixes the crosslinking agent, catalyst, plasticizer, thixotropic agent, and filler, dehydrates, and discharges to obtain component B.

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