Modified silane-terminated polyether sealant and preparation method thereof

Abstract

The invention relates to the technical field of silane-terminated polyether sealants, in particular to a modified silane-terminated polyether sealant and a preparation method thereof.The modified silane-terminated polyether sealant comprises a component A and a component B, and the volume ratio of the component A to the component B is (0.95-1.05): 1; the component A is prepared from the following components in parts by weight: 40 to 60 parts of silane-terminated polyether resin, 30 to 40 parts of filler A, 2 to 4 parts of tackifier, 10 to 20 parts of active polyether and 2 to 5 parts of dewatering agent A; the component B is prepared from the following components in parts by weight: 30-40 parts of modified epoxy resin, 40-50 parts of filler B, 1-2 parts of a catalyst, 1-2 parts of an anti-aging agent and 5-8 parts of a moisture scavenger B. The shear strength and the tensile strength of the silane-terminated polyether sealant disclosed by the invention are both greater than 5.0 MPa and are higher than those of the traditional silane-terminated polyether sealant.

Description

Technical Field

[0001] This invention relates to the field of silane-terminated polyether sealant technology, and more particularly to a modified silane-terminated polyether sealant and its preparation method. Background Technology

[0002] Silane-terminated polyether sealant is a new type of environmentally friendly adhesive composed of silane-terminated polyether resin, plasticizer, reinforcing filler, catalyst, dehydrating agent, silane coupling agent, and other additives. Its curing principle involves a chemical reaction between the colloid and moisture in the air. This sealant combines the advantages of silicone sealants and polyurethane elastic sealants, possessing good coatability, low staining, excellent adhesion, high elongation at break, and resilience. Furthermore, it cures without generating bubbles, making it widely used in prefabricated construction, home decoration, industrial manufacturing, automobile manufacturing, and new energy battery assembly industries.

[0003] Despite the numerous advantages of silane-terminated polyether sealants, a common problem in the industry is their relatively low bulk strength and shear strength, as well as slow curing speed. Most commercially available silane-terminated polyether sealants in China have a bulk strength and shear strength below 3 MPa. Although these sealants have a relatively fast surface drying speed, their actual drying speed is slow.

[0004] In-depth analysis reveals that silane coupling agents and plasticizers are the main factors contributing to the low bulk strength and shear strength of silane-terminated polyether sealants, with plasticizers having a particularly significant impact. The primary function of plasticizers is to reduce the viscosity of the sealant, facilitating high-temperature dehydration of reinforcing fillers. They are typically non-reactive phthalates, adipates, and polypropylene glycol ethers of appropriate molecular weight. Because these substances do not react in the sealant, they contribute to a decrease in sealant strength. Therefore, if the adhesive strength and bulk tensile strength of silane-terminated polyether sealants can be improved while maintaining other properties, and the curing speed can be accelerated, their application range will be greatly expanded.

[0005] Chinese patent CN 117659922 A discloses a two-component modified silane sealant and its preparation method, which improves the overall strength of the adhesive through hybridization of epoxy resin and silane-terminated polyether. However, this patent does not explain the curing mechanism of the epoxy resin in the system. Furthermore, this method places the catalyst used to embed the silane-terminated polyether and the silane-terminated polyether in the same component, which reduces the storage stability of this component.

[0006] The purpose of this invention is to address the problems of low strength, poor storage stability, and slow reaction rate of silane-terminated polyether sealants. Therefore, we propose a modified silane-terminated polyether sealant and its preparation method to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a modified silane-terminated polyether sealant and its preparation method.

[0008] A modified silane-terminated polyether sealant, comprising component A and component B, wherein the volume ratio of component A to component B is 0.95 to 1.05:1; Component A consists of the following components in parts by weight: 40-60 parts of silane-terminated polyether resin, 30-40 parts of filler A, 2-4 parts of tackifier, 10-20 parts of active polyether, and 2-5 parts of dehydrating agent A; Component B consists of the following components in parts by weight: 30-40 parts modified epoxy resin, 40-50 parts filler B, 1-2 parts catalyst, 1-2 parts anti-aging agent, and 5-8 parts dehydrating agent B.

[0009] Preferably, the silane-terminated polyether resin is one or a combination of two of dialkoxysilane-modified polyether and trialkoxysilane-modified polyether.

[0010] Preferably, the modified epoxy resin is a product obtained by reacting polypropylene glycol glycidyl ether and a monofunctional primary amine polyether, wherein the polypropylene glycol glycidyl ether is one or a combination of polypropylene glycol glycidyl ether 663, polypropylene glycol glycidyl ether EPG-207, and polypropylene glycol glycidyl ether EPG-227, and the number average molecular weight of the monofunctional primary amine polyether is 1000-2000 g / mol.

[0011] Preferably, the modified epoxy resin is prepared by adding polypropylene glycol glycidyl ether and monofunctional primary amine polyether to a reactor at an epoxy group:amino group molar ratio of 2:1 to 4:1, mechanically stirring at a stirring speed of 200 to 600 rpm for 0.2 to 0.6 hours, heating to 70 to 90°C and reacting for 2 to 4 hours, then heating to 110 to 130°C and reacting for 2 to 4 hours, and after the reaction is completed, dehydrating under a vacuum of -0.09 to -0.1 MPa for 1 to 4 hours, cooling down and storing in a sealed container.

[0012] Preferably, the tackifier is an aminosilane coupling agent, and the aminosilane coupling agent molecule has a primary or secondary amino group with a number of amino groups greater than or equal to 2.

[0013] Preferably, the dehydrating agent A is silane coupling agent A171, the dehydrating agent B is 4A molecular sieve activating powder; the anti-aging agent is BASF B75; and the catalyst is a combination of chelated organotin and ordinary organotin.

[0014] Preferably, both filler A and filler B are selected from one or more combinations of nano-activated calcium carbonate, modified light calcium carbonate, and modified heavy calcium carbonate, and the modifiers of the nano-activated calcium carbonate, modified light calcium carbonate, and modified heavy calcium carbonate are one or more combinations of silane coupling agents, titanate coupling agents, and aluminate coupling agents.

[0015] Preferably, the particle size of filler A is 3-20 times that of filler B.

[0016] Preferably, the active polyether is one or a combination of two of the terminal amino polyethers with a functionality of 2 or 3, the number average molecular weight of the amino polyether is 1000-3000 g / mol, and the amino group is a secondary amino or a primary amino group.

[0017] Preferably, a method for preparing a modified silane-terminated polyether sealant includes the following steps: Step A: Add silane-terminated polyether resin, filler A, active polyether, and half of the amount of dehydrating agent A to a double planetary stirrer. Disperse the mixture at 600-900 rpm for 0.5-1 hour under normal pressure. Then continue dispersing under a vacuum of -0.09 to -0.1 MPa for 1-2 hours, controlling the reaction temperature below 50°C. After stirring, cool the mixture to below 40°C, add the thickener and the remaining half of the amount of dehydrating agent A, and stir at 180-300 rpm for 1-2 hours under vacuum. Finally, pressurize under nitrogen to obtain component A. Step B: Add the modified epoxy resin, filler B, anti-aging agent, and dehydrating agent B to a double planetary stirrer and disperse at 600-900 rpm for 0.5-1 hour under normal pressure. Then, continue dispersion under a vacuum of -0.09 to -0.1 MPa for 1-2 hours, controlling the reaction temperature below 50°C. Cool down to below 40°C, add the catalyst, and stir at 180-300 rpm for 1-2 hours after evacuation. Finally, release the pressure with nitrogen to obtain component B.

[0018] The beneficial effects of this invention are: 1. In this invention, the silane-terminated polyether resin component and the catalyst component are separated, that is, the silane-terminated polyether sealant is made into AB components. The volume ratio of component A to component B is close to 1:1 when they are mixed. The two can be mixed statically, which is uniform and does not easily generate bubbles. It is convenient to use and does not affect the performance of the sealant. At the same time, it also solves the problem of the storage stability of the sealant.

[0019] 2. In this invention, polypropylene glycol glycidyl ether is used instead of plasticizer. It has low viscosity and epoxy groups at both ends, which reduces the viscosity of the sealant. When components A and B are mixed, the epoxy groups can also react with the amine silane coupling agent in component A to form a crosslinking reaction. This results in two crosslinking reactions during sealant curing, making the entire sealant a unified whole and eliminating the adverse effects of non-reactive plasticizers. Consequently, the sealant exhibits higher bulk tensile and shear strengths, both exceeding 5.0 MPa. This improves the mechanical properties of the silane-terminated polyether sealant. Furthermore, the participation of polypropylene glycol glycidyl ether in the reaction increases the reaction rate of the silane-terminated polyether resin, thereby improving curing efficiency.

[0020] 3. In this invention, dehydrating agent A is silane coupling agent A171, and dehydrating agent B is 4A molecular sieve activated powder. A small amount of moisture absorbed during the storage of component A will undergo hydrolysis and condensation reactions with dehydrating agent A to form siloxane bonds, thus improving the bonding strength between the organic components and filler A in component A. A small amount of moisture absorbed during the storage of component B will be absorbed by the 4A molecular sieve activated powder and the porous filler B. When component A and component B are finally mixed, the small amount of moisture inside the 4A molecular sieve activated powder and filler B will, to a certain extent, increase the reaction rate. Furthermore, the curing reaction allows the 4A molecular sieve activated powder and filler B to adhere between the organic components. On the other hand, the particle size of filler A is larger than that of filler B. The final cured sealant forms a structure where the nodes are composed of large-sized filler A, and the spaces between the nodes are composed of organic components and small-sized filler B (dehydrating agent B). Ultimately, filler A improves the wear resistance of the sealant, while filler B improves its elongation at break and resilience.

[0021] 4. The silane-terminated polyether sealant of the present invention has a fast curing speed. After 2 hours of curing, the tensile strength of the colloid is greater than 0.3 MPa, and after 24 hours of curing, the tensile strength of the colloid can reach 90% of the final tensile strength of the colloid. The curing speed is much higher than that of single-component silane-terminated polyether sealant. Detailed Implementation

[0022] The present invention will be further explained below with reference to specific embodiments.

[0023] In Example 1, a modified silane-terminated polyether sealant includes component A and component B, with a volume ratio of component A to component B of 0.95:1. Component A consists of the following components in parts by weight: 40 parts silane-terminated polyether resin, 30 parts filler A, 2 parts tackifier, 10 parts activated polyether, and 2 parts dehydrating agent A; Component B consists of the following components in parts by weight: 30 parts modified epoxy resin, 40 parts filler B, 1 part catalyst, 1 part anti-aging agent, and 5 parts dehydrating agent B.

[0024] The silane-terminated polyether resin is a dialkoxysilane-modified polyether.

[0025] The modified epoxy resin is a product obtained by reacting polypropylene glycol glycidyl ether and monofunctional primary amino polyether, wherein the polypropylene glycol glycidyl ether is polypropylene glycol glycidyl ether 663, and the number average molecular weight of the monofunctional primary amino polyether is 10000 g / mol. The preparation method of the modified epoxy resin is as follows: polypropylene glycol glycidyl ether and monofunctional primary amino polyether are added to a reactor at an epoxy group:amino group molar ratio of 2:1. The mixture is mechanically stirred at 200 rpm for 0.2 hours, heated to 70℃ and reacted for 2 hours, then heated to 110℃ and reacted for another 2 hours. After the reaction is completed, the mixture is dehydrated under a vacuum of -0.09 MPa for 1 hour, cooled, and then stored in a sealed container.

[0026] The tackifier is an aminosilane coupling agent, and the number of primary or secondary amino groups in the aminosilane coupling agent molecule is greater than or equal to 2.

[0027] Dehydrating agent A is silane coupling agent A171, dehydrating agent B is 4A molecular sieve activating powder; anti-aging agent is BASF B75; catalyst is a combination of chelated organotin and ordinary organotin.

[0028] Both filler A and filler B are selected from nano-activated calcium carbonate, and the modifier for nano-activated calcium carbonate is silane coupling agent (KH550).

[0029] The particle size of filler A is three times that of filler B, with the median particle size of filler A being 150 nm and the median particle size of filler B being 50 nm.

[0030] The active polyether is a terminal amino polyether with a functionality of 2. The number average molecular weight of the amino polyether is 1000 g / mol, and the amino group is a secondary amino group.

[0031] A method for preparing a modified silane-terminated polyether sealant includes the following steps: Step A: Add silane-terminated polyether resin, filler A, active polyether, and half of the amount of dehydrating agent A to a double planetary stirrer. Disperse at 600 rpm for 0.5 hours under normal pressure, and then continue to disperse under a vacuum of -0.09 MPa for 1 hour, controlling the reaction temperature below 50℃ (actual reaction temperature 42℃). After stirring, cool down to below 40℃ (down to 25℃), add thickener and the remaining half of the amount of dehydrating agent A, and stir at 180 rpm for 1 hour after vacuuming. Finally, pressurize under nitrogen to obtain component A. Step B: Add the modified epoxy resin, filler B, anti-aging agent and dehydrating agent B to a double planetary stirrer, disperse at 600 rpm for 0.5 hours under normal pressure, and then continue to disperse at -0.09 MPa vacuum for 1 hour, controlling the reaction temperature below 50℃ (actual reaction temperature 42℃); cool down to below 40℃ (down to 25℃), add the catalyst, and stir at 180 rpm for 1 hour after vacuuming, and finally release the pressure with nitrogen to obtain component B.

[0032] In Example 2, a modified silane-terminated polyether sealant includes component A and component B, with a volume ratio of component A to component B of 1.05:1. Component A consists of the following components in parts by weight: 60 parts silane-terminated polyether resin, 40 parts filler A, 4 parts tackifier, 20 parts activated polyether, and 5 parts dehydrating agent A; Component B consists of the following components in parts by weight: 40 parts modified epoxy resin, 50 parts filler B, 2 parts catalyst, 2 parts anti-aging agent, and 8 parts dehydrating agent B.

[0033] The silane-terminated polyether resin is a mixture of dialkoxysilane-modified polyether and trialkoxysilane-modified polyether in a mass ratio of 1:1.

[0034] The modified epoxy resin is a product obtained by reacting polypropylene glycol glycidyl ether and monofunctional primary amine polyether. The polypropylene glycol glycidyl ether is a mixture of polypropylene glycol glycidyl ether EPG-207 and polypropylene glycol glycidyl ether EPG-227 in a mass ratio of 1:1. The number average molecular weight of the monofunctional primary amine polyether is 2000 g / mol.

[0035] The modified epoxy resin is prepared as follows: polypropylene glycol glycidyl ether and monofunctional primary amine polyether are added to the reactor at an epoxy group:amino molar ratio of 4:1. The mixture is mechanically stirred at 600 rpm for 0.6 hours, heated to 90℃ for 4 hours, and then heated to 130℃ for 4 hours. After the reaction is completed, the mixture is dehydrated under a vacuum of -0.1 MPa for 4 hours, cooled, and then stored in a sealed container.

[0036] The tackifier is an aminosilane coupling agent, and the number of primary or secondary amino groups in the aminosilane coupling agent molecule is greater than or equal to 2.

[0037] Dehydrating agent A is silane coupling agent A171, dehydrating agent B is 4A molecular sieve activating powder; anti-aging agent is BASF B75; catalyst is a combination of chelated organotin and ordinary organotin.

[0038] Both filler A and filler B are selected from nano-activated calcium carbonate and modified light calcium carbonate, and the modifiers for nano-activated calcium carbonate and modified light calcium carbonate are titanate coupling agents.

[0039] The particle size of filler A is 20 times that of filler B, with the median particle size of filler A being 300 nm and the median particle size of filler B being 15 nm.

[0040] The active polyether is a mixture of terminal amino polyether with functionality 2 and terminal amino polyether with functionality 3 in a mass ratio of 1:1. The number average molecular weight of the amino polyether is 3000 g / mol, and the amino group is a primary amino group.

[0041] A method for preparing a modified silane-terminated polyether sealant includes the following steps: Step A: Add silane-terminated polyether resin, filler A, active polyether, and half of the amount of dehydrating agent A to a double planetary stirrer. Disperse at 900 rpm for 1 hour under normal pressure, and then continue to disperse under a vacuum of -0.1 MPa for 2 hours, controlling the reaction temperature below 50℃ (actual reaction temperature 48℃). After stirring, cool down to below 40℃ (down to 35℃), add thickener and the remaining half of the amount of dehydrating agent A, and stir at 300 rpm for 2 hours after vacuuming. Finally, pressurize under nitrogen to obtain component A. Step B: Add the modified epoxy resin, filler B, anti-aging agent and dehydrating agent B to a double planetary stirrer, disperse at 900 rpm for 1 hour under normal pressure, and then continue to disperse under a vacuum of -0.1 MPa for 2 hours, controlling the reaction temperature below 50℃ (actual reaction temperature 48℃); cool down to below 40℃ (down to 35℃), add the catalyst, and stir at 300 rpm for 2 hours after evacuation. Finally, release the pressure with nitrogen to obtain component B.

[0042] In Example 3, a modified silane-terminated polyether sealant includes component A and component B, with a volume ratio of component A to component B of 1:1. Component A consists of the following components in parts by weight: 50 parts silane-terminated polyether resin, 35 parts filler A, 3 parts tackifier, 15 parts activated polyether, and 3 parts dehydrating agent A; Component B consists of the following components in parts by weight: 35 parts modified epoxy resin, 45 parts filler B, 1.5 parts catalyst, 1.5 parts anti-aging agent, and 6 parts dehydrating agent B.

[0043] The silane-terminated polyether resin is a trialkoxysilane-modified polyether.

[0044] The modified epoxy resin is a product obtained by reacting polypropylene glycol glycidyl ether and monofunctional primary amine polyether, wherein the polypropylene glycol glycidyl ether is polypropylene glycol glycidyl ether EPG-227, and the number average molecular weight of the monofunctional primary amine polyether is 1200 g / mol.

[0045] The modified epoxy resin is prepared as follows: polypropylene glycol glycidyl ether and monofunctional primary amine polyether are added to the reactor at an epoxy group: amino molar ratio of 3:1. The mixture is mechanically stirred at 500 rpm for 0.5 hours, heated to 80℃ for 3 hours, and then heated to 120℃ for 3 hours. After the reaction is completed, the mixture is dehydrated under a vacuum of -0.09 MPa for 2 hours, cooled, and then stored in a sealed container.

[0046] The tackifier is an aminosilane coupling agent, and the number of amino groups of the primary or secondary amino groups in the aminosilane coupling agent molecule is equal to 3.

[0047] Dehydrating agent A is silane coupling agent A171, dehydrating agent B is 4A molecular sieve activating powder; anti-aging agent is BASF B75; catalyst is a combination of chelated organotin and ordinary organotin.

[0048] Both filler A and filler B are selected from a mixture of nano-activated calcium carbonate, modified light calcium carbonate, and modified heavy calcium carbonate. The modifiers for nano-activated calcium carbonate, modified light calcium carbonate, and modified heavy calcium carbonate are a mixture of silane coupling agent, titanate coupling agent, and aluminate coupling agent in a mass ratio of 1:1:1.

[0049] The particle size of filler A is 10 times that of filler B.

[0050] The active polyether is a terminal amino polyether with a functionality of 3. The number average molecular weight of the amino polyether is 2000 g / mol, and the amino group is a secondary amino or a primary amino group.

[0051] A method for preparing a modified silane-terminated polyether sealant includes the following steps: Step A: Add silane-terminated polyether resin, filler A, active polyether, and half of the amount of dehydrating agent A to a double planetary stirrer. Disperse at 800 rpm for 0.8 hours under normal pressure, and then continue to disperse under a vacuum of -0.09 MPa for 1.5 hours, controlling the reaction temperature below 50℃ (actual reaction temperature 45℃). After stirring, cool down to below 40℃ (down to 30℃), add thickener and the remaining half of the amount of dehydrating agent A, and stir at 240 rpm for 1.5 hours after vacuuming. Finally, pressurize under nitrogen to obtain component A. Step B: Add the modified epoxy resin, filler B, anti-aging agent and dehydrating agent B to a double planetary stirrer and disperse at 800 rpm for 0.8 hours under normal pressure. Then continue to disperse under a vacuum of -0.09 MPa for 1.5 hours, controlling the reaction temperature below 50℃ (actual reaction temperature 45℃). Cool down to below 40℃ (down to 30℃), add the catalyst, and stir at 240 rpm for 1.5 hours after evacuation. Finally, release the pressure with nitrogen to obtain component B.

[0052] In Comparative Example 1, compared with Example 3, an equal mass of plasticizer (phthalate esters) was used instead of modified epoxy resin, and the rest was the same as in Example 3.

[0053] In Comparative Example 2, compared with Example 3, packing A and packing B of the same size were used, and the rest were the same as in Example 3.

[0054] In Comparative Example 3, compared with Example 3, the particle size of filler A is 0.1 times that of filler B, and the rest is the same as in Example 3.

[0055] The modified silane-terminated polyether sealants prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to relevant performance tests. Tensile strength and elongation at break were determined according to GB / T 7124-2008: "Determination of Tensile Shear Strength of Adhesives (Rigid Material to Rigid Material)". During the test, a static mixing head was installed between components A and B, and the modified silane-terminated polyether sealant was applied using a glue gun. After curing at room temperature for 7 days, the performance of the cured modified silane-terminated polyether sealant material was tested. The test results are shown in Table 1.

[0056] Table 1

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A modified silane-terminated polyether sealant, characterized in that, It includes component A and component B, with a volume ratio of component A to component B of 0.95 to 1.05:1; Component A consists of the following components in parts by weight: 40-60 parts of silane-terminated polyether resin, 30-40 parts of filler A, 2-4 parts of tackifier, 10-20 parts of active polyether, and 2-5 parts of dehydrating agent A; Component B consists of the following components in parts by weight: 30-40 parts modified epoxy resin, 40-50 parts filler B, 1-2 parts catalyst, 1-2 parts anti-aging agent, and 5-8 parts dehydrating agent B.

2. The modified silane-terminated polyether sealant according to claim 1, characterized in that, The silane-terminated polyether resin is one or a combination of two of dialkoxysilane-modified polyether and trialkoxysilane-modified polyether.

3. The modified silane-terminated polyether sealant according to claim 1, characterized in that, The modified epoxy resin is a product obtained by reacting polypropylene glycol glycidyl ether and monofunctional primary amine polyether, wherein the polypropylene glycol glycidyl ether is one or a combination of polypropylene glycol glycidyl ether 663, polypropylene glycol glycidyl ether EPG-207, and polypropylene glycol glycidyl ether EPG-227, and the number average molecular weight of the monofunctional primary amine polyether is 1000-2000 g / mol.

4. The modified silane-terminated polyether sealant according to claim 3, characterized in that, The modified epoxy resin is prepared by adding polypropylene glycol glycidyl ether and monofunctional primary amine polyether to a reactor at an epoxy group:amino group molar ratio of 2:1 to 4:1, mechanically stirring at a stirring speed of 200 to 600 rpm for 0.2 to 0.6 hours, heating to 70 to 90°C for 2 to 4 hours, then heating to 110 to 130°C for 2 to 4 hours, and finally dehydrating under a vacuum of -0.09 to -0.1 MPa for 1 to 4 hours, and then storing it in a sealed container after cooling.

5. The modified silane-terminated polyether sealant according to claim 1, characterized in that, The tackifier is an aminosilane coupling agent, and the aminosilane coupling agent molecule has a primary or secondary amino group with a number of amino groups greater than or equal to 2.

6. The modified silane-terminated polyether sealant according to claim 1, characterized in that, The dehydrating agent A is silane coupling agent A171, and the dehydrating agent B is 4A molecular sieve activated powder; the anti-aging agent is BASF B75; the catalyst is a combination of chelated organotin and ordinary organotin.

7. The modified silane-terminated polyether sealant according to claim 1, characterized in that, Both filler A and filler B are selected from one or more combinations of nano-activated calcium carbonate, modified light calcium carbonate, and modified heavy calcium carbonate. The modifiers of nano-activated calcium carbonate, modified light calcium carbonate, and modified heavy calcium carbonate are one or more combinations of silane coupling agents, titanate coupling agents, and aluminate coupling agents.

8. The modified silane-terminated polyether sealant according to claim 7, characterized in that, The particle size of filler A is 3-20 times that of filler B.

9. The modified silane-terminated polyether sealant according to claim 1, characterized in that, The active polyether is one or a combination of two of the terminal amino polyethers with a functionality of 2 or 3, wherein the number average molecular weight of the amino polyether is 1000-3000 g / mol, and the amino group is a secondary amino or a primary amino group.

10. A method for preparing a modified silane-terminated polyether sealant according to any one of claims 1-9, characterized in that, Includes the following steps: Step A: Add silane-terminated polyether resin, filler A, active polyether, and half of the amount of dehydrating agent A to a double planetary stirrer. Disperse at 600-900 rpm for 0.5-1 hour under normal pressure. Then continue dispersion for 1-2 hours under a vacuum of -0.09 to -0.1 MPa, controlling the reaction temperature below 50°C. After stirring, cool to below 40°C, add tackifier and the remaining half of the amount of dehydrating agent A, and stir at 180-300 rpm for 1-2 hours under vacuum. Finally, pressurize under nitrogen to obtain component A. Step B: Add the modified epoxy resin, filler B, anti-aging agent, and dehydrating agent B to a double planetary stirrer and disperse at 600-900 rpm for 0.5-1 hour under normal pressure. Then, continue dispersion under a vacuum of -0.09 to -0.1 MPa for 1-2 hours, controlling the reaction temperature below 50°C. Cool down to below 40°C, add the catalyst, and stir at 180-300 rpm for 1-2 hours after evacuation. Finally, release the pressure with nitrogen to obtain component B.

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