Silicone weather-resistant sealant with high displacement capacity and preparation method thereof

Abstract

The invention belongs to the technical field of silicone rubber, and particularly relates to a silicone weather-resistant sealant with high displacement capacity and a preparation method thereof. The silicone weather-resistant sealant is prepared from the following raw materials in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 5 to 10 parts of methyl-terminated polydimethylsiloxane, 60 to 100 parts of a nano reinforcing material, 1 to 5 parts of a chain extender, 3 to 8 parts of a cross-linking agent I, 3 to 8 parts of a cross-linking agent II, 2 to 5 parts of a coupling agent and 0.1 to 1 part of a catalyst. The silicone weather-resistant sealant has excellent bonding performance, the maximum tensile strength elongation can reach 800% or above, the displacement capacity meets the requirements of GB / T 22083-2008 standard 100 / 50 level, and meanwhile the silicone weather-resistant sealant has excellent weather resistance, water resistance, ultraviolet resistance and the like. The weather-proof waterproof sealing strip is particularly suitable for weather-proof waterproof sealing of building daylighting roofs, high-rise curtain walls, super high-rise curtain walls and other places with large joint deformation.

Description

Technical Field

[0001] This invention belongs to the field of silicone rubber technology, specifically relating to a high displacement capacity silicone weather-resistant sealant and its preparation method. Background Technology

[0002] In modern building structural systems, curtain walls are the most critical structure for weather-resistant sealing of building joints. To ensure excellent and durable watertight and airtight performance of building curtain walls, special considerations are often required during design and construction, including the adhesion of sealant to different wall panels and substrate materials, the selection of sealant joint shape and bonding method, stress analysis of joints, and calculation of joint width and thickness. Therefore, there are significant differences in the selection and use of silicone weather-resistant sealant for different structural forms of building curtain walls, especially high-rise and super high-rise curtain walls, building skylights, and steel structure main curtain walls.

[0003] The displacement capacity of silicone sealant refers to its ability, after curing, to adapt to tensile or compressive deformation of the joint caused by factors such as temperature changes, wind loads, and earthquakes without cracking or detachment. It is usually expressed as a percentage. For example, high displacement capacity elastic sealant grades are mainly 35 (test tensile / compression range ±35%), 50 (test tensile / compression range ±50%), and 100 / 50 (test tensile / compression range +100% / -50%).

[0004] Chinese invention patent CN 109762510 B discloses a high-displacement-capability silicone weather-resistant sealant, employing a dialkoxysilane compound chain extender and a secondary aminosilane coupling agent to reduce modulus and improve displacement capacity. Chinese invention patent CN109679572 B discloses a low-modulus, high-displacement-capability silicone fire-retardant sealant; by appropriately proportioning a crosslinking agent and rationally controlling the amounts of flame retardant and crosslinking agent, a silicone fire-retardant sealant with both low modulus and high displacement capacity can be prepared. Both of these prior art technologies reduce modulus and improve displacement capacity by using difunctional chain extenders or crosslinking agents to reduce the degree of crosslinking. However, a decrease in the degree of crosslinking also leads to a decrease in elastic recovery rate and weather resistance. Summary of the Invention

[0005] In view of the shortcomings and deficiencies of the existing technology, the primary objective of this invention is to provide a high displacement capacity silicone weather-resistant sealant.

[0006] Another object of the present invention is to provide the above-mentioned high displacement capacity silicone weather-resistant sealant and its preparation method.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A high displacement capacity silicone weather-resistant sealant is prepared from raw materials comprising the following parts by weight:

[0009] 100 parts of hydroxyl-terminated polydimethylsiloxane

[0010] 5-10 parts of methyl-terminated polydimethylsiloxane

[0011] 60-100 parts of nano-reinforcing material

[0012] Chain extender 1-5 parts,

[0013] Crosslinking agent I 3-8 parts,

[0014] Crosslinking agent II 3-8 parts,

[0015] 2-5 parts of coupling agent,

[0016] Catalyst 0.1~1 part;

[0017] The crosslinking agent I is one or more of methyltris(N-methylacetamido)silane, methyltris(N-ethylacetamido)silane, methyltris(N-propylacetamido)silane, methyltris(N-methylpropamido)silane, methyltris(N-ethylpropamido)silane, and methyltris(N-propylpropamido)silane.

[0018] The crosslinking agent II is a carbon chain branched crosslinking agent, which is prepared by the following method:

[0019] Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were mixed and reacted in anhydrous conditions at a molar ratio of 1:3~4 until a homogeneous phase was obtained, yielding a carbon chain branched crosslinking agent.

[0020] The crosslinking agent I of the present invention is a deamidated crosslinking agent, which has a low tendency for self-crosslinking and can more efficiently crosslink with hydroxyl-terminated polydimethylsiloxane, thereby having a more uniform crosslinking network. The resulting silicone sealant has better displacement capability and lower modulus.

[0021] The carbon chain branching crosslinking agent of this invention is a carbon chain-blocking macromolecular de-alcoholized crosslinking agent. Compared with conventional small molecule de-alcoholized crosslinking agents, it has two advantages: firstly, its self-crosslinking activity is reduced, increasing the crosslinking efficiency with hydroxyl-terminated polydimethylsiloxane, thus resulting in better crosslinking uniformity; secondly, the crosslinked polydimethylsiloxane molecular chains are separated by branched carbon chains, further expanding the polysiloxane molecular chain crosslinking network without significantly affecting the degree of crosslinking, thereby changing the density distribution and network topology of the silicone sealant crosslinking network. The resulting silicone weather-resistant sealant maintains both high displacement capability and good elastic recovery and weather resistance. Furthermore, this carbon chain branching crosslinking agent introduces a large number of polar hydroxyl and amine groups, which can improve the adhesion performance of the resulting silicone sealant to the substrate.

[0022] The reaction principle of the above carbon chain branching crosslinking agent is as follows:

[0023] .

[0024] In the above reaction, the molar ratio of γ-aminopropyltriethoxysilane to glycerol triglycidyl ether needs to be ≥3 to prevent excessive cross-linking and curing of the epoxy groups, which would affect its processing performance. An appropriate excess of aminopropyltriethoxysilane can act as a common de-alcoholized cross-linking agent in the cross-linking reaction of silicone sealants.

[0025] In order to improve the reaction efficiency, the reaction can be carried out under certain heating conditions (such as 40~80℃) for 1~4 hours.

[0026] The above reaction requires an anhydrous environment under an inert atmosphere to prevent premature hydrolysis or cross-linking of the ethoxy group.

[0027] The above reaction process can be tracked by detecting the content of epoxy groups or amino groups in the product.

[0028] Furthermore, the viscosity of the hydroxyl-terminated polydimethylsiloxane at 25°C is 10,000~500,000 MPa·s; and the viscosity of the methyl-terminated polydimethylsiloxane at 25°C is 100~2,000 MPa·s.

[0029] Furthermore, the nano-reinforcing material is one or more of the following: nano-sized calcium carbonate, heavy calcium carbonate, quartz powder, fumed silica, and precipitated silica.

[0030] Further, the chain extender is one or more of methylvinyldi(N-methylacetamido)silane, methylvinyldi(N-ethylacetamido)silane, methylvinyldi(N-propylacetamido)silane, methylvinyldi(N-methylpropionyl)silane, methylvinyldi(N-ethylpropionyl)silane, and methylvinyldi(N-propylpropionyl)silane.

[0031] The present invention uses a deamidated chain extender that has better specific reactivity with silanol groups and has a lower tendency to polycondense, which can more efficiently promote the linear growth of hydroxyl-terminated polydimethylsiloxane molecular chains. Compared with the dealcoholized chain extender, the silicone sealant prepared has better displacement ability and lower modulus.

[0032] Further, the coupling agent is one or more of γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, β-(3,4-epoxycyclohexane)ethyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, 3-(N-cyclohexylamino)propyltrimethoxysilane, N-(n-butyl)-3-aminopropyltriethoxysilane, and N-(n-butyl)-3-aminopropyltrimethoxysilane.

[0033] The coupling agent of this invention contains polar amino / amine groups or epoxy groups, which can significantly improve the adhesion of silicone sealant to the substrate.

[0034] Furthermore, the catalyst is one or more of dibutyltin dilaurate, dibutyldiphenyltin diacetate, and stannous octoate.

[0035] The preparation method of the above-mentioned high displacement capacity silicone weather-resistant sealant includes the following steps:

[0036] Hydroxyl-terminated polydimethylsiloxane, methyl-terminated polydimethylsiloxane, and nano-reinforcing materials were added to a kneader and heated to mix evenly. After vacuum dehydration and cooling, chain extender, crosslinking agent I, crosslinking agent II, coupling agent, and catalyst were added in sequence and mixed evenly. The mixture was then sealed and packaged to obtain a high displacement capacity silicone weather-resistant sealant.

[0037] Furthermore, the temperature for heating and mixing to achieve uniformity is 100~120℃, and the time is 1~4h.

[0038] Compared with the prior art, the beneficial effects of the present invention are:

[0039] The silicone weather-resistant sealant of this invention not only possesses excellent adhesion properties, but also boasts a maximum tensile strength elongation of over 800%, and its displacement capacity meets the requirements of GB / T 22083-2008 standard grade 100 / 50. Furthermore, it exhibits superior weather resistance, water resistance, and UV resistance. It is particularly suitable for weather-resistant and waterproof sealing of joints in building skylights, high-rise and super high-rise curtain walls, and other applications with significant deformation. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0041] Example 1

[0042] A high displacement capacity silicone weather-resistant sealant is prepared from the following raw materials in parts by weight:

[0043] 100 parts of hydroxyl-terminated polydimethylsiloxane (107 adhesive with a viscosity of 250,000 MPa·s at 25°C),

[0044] 8 parts of methyl-terminated polydimethylsiloxane (viscosity at 25°C: 1000 MPa·s),

[0045] 80 parts of nano-reinforcing material (fumed silica),

[0046] Chain extender (methylvinylbis(N-methylacetamido)silane) 3 parts,

[0047] Crosslinking agent I (methyltris(N-methylacetamido)silane) 5 parts,

[0048] Crosslinking agent II (carbon chain branching crosslinking agent) 5 parts,

[0049] Coupling agent (2 parts γ-aminopropyltriethoxysilane + 1 part 3-(N-cyclohexylamino)propyltrimethoxysilane).

[0050] Catalyst (dibutyltin dilaurate) 0.5 parts.

[0051] The preparation method of the carbon chain branching crosslinking agent is as follows:

[0052] Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were added to a nitrogen-purged reactor at a molar ratio of 1:3.5. The mixture was then heated to 60°C and reacted for 3 hours until a homogeneous phase was obtained. The epoxy value of the product was measured to confirm the reaction endpoint, and the carbon chain branched crosslinking agent was obtained.

[0053] The preparation method of the high displacement capacity silicone weather-resistant sealant is as follows:

[0054] Hydroxyl-terminated polydimethylsiloxane, methyl-terminated polydimethylsiloxane, and nano-reinforcing materials were added to a kneader and heated to 100-120°C and kneaded for 2 hours until homogeneous. Then, the mixture was vacuum-dried for 1 hour and cooled to room temperature. Chain extender, crosslinking agent I, crosslinking agent II, coupling agent, and catalyst were added sequentially and mixed evenly. The mixture was then discharged, sealed, and packaged to obtain a high displacement capacity silicone weather-resistant sealant.

[0055] The performance test results of the silicone weather-resistant sealant obtained in this embodiment are shown in Table 1 below:

[0056] Table 1

[0057] performance index Test methods Displacement capability level 100 / 50 GB / T 22083 Maximum tensile strength elongation / % 824 Tensile tester Elastic recovery rate / % 86 GB / T 13477.17 (Method B, 100% tensile elongation) Constant elongation adhesion Non-destructive GB / T 13477.10 (Method B, 100% elongation at constant elongation) Adhesion after cold drawing and hot pressing Non-destructive GB / T 13477.13 (Method B, tensile strength 100%, compression strength -50%) Adhesion after exposure to heat, artificial light through glass, and water. Non-destructive GB / T 13477.15 (Method B, artificial circulation, 100% elongation at constant elongation) Adhesion after immersion in water Non-destructive GB / T 13477.11 (Method B, 100% elongation at constant elongation)

[0058] Example 2

[0059] A high displacement capacity silicone weather-resistant sealant is prepared from the following raw materials in parts by weight:

[0060] 100 parts of hydroxyl-terminated polydimethylsiloxane (107 adhesive with a viscosity of 350,000 MPa·s at 25°C)

[0061] 5 parts of methyl-terminated polydimethylsiloxane (viscosity 200 MPa·s at 25°C),

[0062] 60 parts of nano-reinforcing material (fumed silica),

[0063] Chain extender (methylvinylbis(N-ethylacetamido)silane) 5 parts,

[0064] Crosslinking agent I (methyltris(N-methylacetamido)silane) 8 parts,

[0065] Crosslinking agent II (carbon chain branching crosslinking agent) 3 parts,

[0066] Coupling agent (2 parts γ-aminopropyltriethoxysilane + 1 part 3-(N-cyclohexylamino)propyltrimethoxysilane).

[0067] Catalyst (dibutyltin dilaurate) 0.5 parts.

[0068] The preparation method of the carbon chain branching crosslinking agent is as follows:

[0069] Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were added to a nitrogen-purged reactor at a molar ratio of 1:4. The mixture was then heated to 60°C and reacted for 3 hours until a homogeneous phase was obtained. The epoxy value of the product was measured to confirm the reaction endpoint, and the carbon chain branched crosslinking agent was obtained.

[0070] The preparation method of the high displacement capacity silicone weather-resistant sealant is the same as that in Example 1.

[0071] The performance test results of the silicone weather-resistant sealant obtained in this embodiment show that the maximum tensile strength elongation is 816%; the elastic recovery rate is 78%; the adhesion at constant elongation, the adhesion after cold drawing and hot pressing, the adhesion after exposure to heat, artificial light source through glass and water, and the adhesion at constant elongation after immersion in water are all undamaged, and the displacement capacity level is 100 / 50.

[0072] Example 3

[0073] A high displacement capacity silicone weather-resistant sealant is prepared from the following raw materials in parts by weight:

[0074] 100 parts of hydroxyl-terminated polydimethylsiloxane (107 adhesive with a viscosity of 450,000 MPa·s at 25°C)

[0075] 10 parts of methyl-terminated polydimethylsiloxane (viscosity at 25°C: 100 MPa·s),

[0076] 100 parts of nano-reinforcing material (fumed silica),

[0077] Chain extender (1 part of methylvinyldi(N-ethylacetamido)silane),

[0078] Crosslinking agent I (methyltris(N-methylacetamido)silane) 3 parts,

[0079] Crosslinking agent II (carbon chain branching crosslinking agent) 8 parts,

[0080] Coupling agent (2 parts γ-aminopropyltriethoxysilane + 1 part 3-(N-cyclohexylamino)propyltrimethoxysilane).

[0081] Catalyst (dibutyltin dilaurate) 0.5 parts.

[0082] The preparation method of the carbon chain branching crosslinking agent is as follows:

[0083] Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were added to a nitrogen-purged reactor at a molar ratio of 1:3. The mixture was then heated to 60°C and reacted for 3 hours until a homogeneous phase was obtained. The epoxy value of the product was measured to confirm the reaction endpoint, and the carbon chain branched crosslinking agent was obtained.

[0084] The preparation method of the high displacement capacity silicone weather-resistant sealant is the same as that in Example 1.

[0085] The performance test results of the silicone weather-resistant sealant obtained in this embodiment show that the maximum tensile strength elongation is 725%; the elastic recovery rate is 90%; the adhesion at constant elongation, the adhesion after cold drawing and hot pressing, the adhesion after exposure to heat, artificial light source through glass and water, and the adhesion at constant elongation after immersion in water are all undamaged, and the displacement capacity level is 100 / 50.

[0086] Example 4

[0087] A high displacement capacity silicone weather-resistant sealant is prepared from the following raw materials in parts by weight:

[0088] 100 parts of hydroxyl-terminated polydimethylsiloxane (107 adhesive with a viscosity of 100,000 MPa·s at 25°C),

[0089] 9 parts of methyl-terminated polydimethylsiloxane (viscosity at 25°C: 1500 MPa·s),

[0090] 70 parts of nano-reinforcing material (fumed silica),

[0091] Chain extender (4 parts of methylvinylbis(N-methylacetamido)silane),

[0092] Crosslinking agent I (methyltris(N-methylacetamido)silane) 6 parts,

[0093] Crosslinking agent II (carbon chain branching crosslinking agent) 6 parts,

[0094] Coupling agent (2 parts γ-aminopropyltriethoxysilane + 1 part 3-(N-cyclohexylamino)propyltrimethoxysilane).

[0095] Catalyst (dibutyltin dilaurate) 0.5 parts.

[0096] The preparation method of the carbon chain branching crosslinking agent is as follows:

[0097] Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were added to a nitrogen-purged reactor at a molar ratio of 1:3.3. The mixture was then heated to 60°C and reacted for 3 hours until a homogeneous phase was obtained. The epoxy value of the product was measured to confirm the reaction endpoint, and the carbon chain branched crosslinking agent was obtained.

[0098] The preparation method of the high displacement capacity silicone weather-resistant sealant is the same as that in Example 1.

[0099] The performance test results of the silicone weather-resistant sealant obtained in this embodiment show that the maximum tensile strength elongation is 650%; the elastic recovery rate is 83%; the adhesion at constant elongation, the adhesion after cold drawing and hot pressing, the adhesion after exposure to heat, artificial light source through glass and water, and the adhesion at constant elongation after immersion in water are all undamaged, and the displacement capacity level is 100 / 50.

[0100] Example 5

[0101] A high displacement capacity silicone weather-resistant sealant is prepared from the following raw materials in parts by weight:

[0102] 100 parts of hydroxyl-terminated polydimethylsiloxane (107 adhesive with a viscosity of 10000 MPa·s at 25°C),

[0103] 10 parts of methyl-terminated polydimethylsiloxane (viscosity 2000 MPa·s at 25°C),

[0104] 90 parts of nano-reinforcing material (fumed silica),

[0105] Chain extender (methylvinylbis(N-methylacetamido)silane) 5 parts,

[0106] Crosslinking agent I (methyltris(N-methylacetamido)silane) 7 parts,

[0107] Crosslinking agent II (carbon chain branching crosslinking agent) 7 parts,

[0108] Coupling agent (2 parts γ-aminopropyltriethoxysilane + 1 part 3-(N-cyclohexylamino)propyltrimethoxysilane).

[0109] Catalyst (dibutyltin dilaurate) 0.5 parts.

[0110] The preparation method of the carbon chain branching crosslinking agent is as follows:

[0111] Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were added to a nitrogen-purged reactor at a molar ratio of 1:3.6. The mixture was then heated to 60°C and reacted for 3 hours until a homogeneous phase was obtained. The epoxy value of the product was measured to confirm the reaction endpoint, and the carbon chain branched crosslinking agent was obtained.

[0112] The preparation method of the high displacement capacity silicone weather-resistant sealant is the same as that in Example 1.

[0113] The performance test results of the silicone weather-resistant sealant obtained in this embodiment show that the maximum tensile strength elongation is 537%; the elastic recovery rate is 80%; the adhesion at constant elongation, the adhesion after cold drawing and hot pressing, the adhesion after exposure to heat, artificial light source through glass and water, and the adhesion at constant elongation after immersion in water are all undamaged, and the displacement capacity level is 100 / 50.

[0114] Comparative Example 1

[0115] A silicone weather-resistant sealant, compared with Example 1, without the addition of crosslinking agent II (carbon chain branching crosslinking agent), and with the amount of crosslinking agent I (methyltris(N-methylacetamido)silane) increased to 10 parts, the rest being the same.

[0116] The performance test results of the silicone weather-resistant sealant obtained in this comparative example show that the maximum tensile strength elongation is 496%; the elastic recovery rate is 85%; the adhesion after cold drawing-hot pressing, the adhesion after exposure to heat, artificial light through glass and water, and the adhesion after immersion in water all showed adhesion failure, and the displacement capacity level was 50.

[0117] The results above show that by using a specific carbon chain branched macromolecular crosslinking agent, the present invention can significantly improve the bonding performance and displacement capability of the obtained silicone weather-resistant sealant.

[0118] Comparative Example 2

[0119] A silicone weather-resistant sealant, compared with Example 1, except that crosslinking agent II (carbon chain branched crosslinking agent) is replaced with an equal amount of dimethyl dibutyl ketone oxime silane crosslinking agent, and the rest are the same.

[0120] The performance test results of the silicone weather-resistant sealant obtained in this comparative example show that the maximum tensile strength elongation is 530%; the elastic recovery rate is 62%; the adhesion test after cold drawing and hot pressing shows adhesion failure and cohesive failure; the adhesion test after exposure to heat, artificial light source through glass and water, and the adhesion test after immersion in water all show adhesion failure; the displacement capacity level is 50.

[0121] The results above show that, by using a specific carbon chain branched macromolecular crosslinking agent, the present invention can significantly improve the bonding performance, displacement capability, and elastic recovery rate of the obtained silicone weather-resistant sealant compared to using a difunctional crosslinking agent to reduce the crosslinking density.

[0122] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A high displacement capacity silicone weather-resistant sealant, characterized in that: It is prepared using raw materials comprising the following parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane 5-10 parts of methyl-terminated polydimethylsiloxane 60-100 parts of nano-reinforcing material Chain extender 1-5 parts, Crosslinking agent I 3-8 parts, Crosslinking agent II 3-8 parts, 2-5 parts of coupling agent, Catalyst 0.1~1 part; The crosslinking agent I is one or more of methyltris(N-methylacetamido)silane, methyltris(N-ethylacetamido)silane, methyltris(N-propylacetamido)silane, methyltris(N-methylpropamido)silane, methyltris(N-ethylpropamido)silane, and methyltris(N-propylpropamido)silane. The crosslinking agent II is a carbon chain branched crosslinking agent, which is prepared by the following method: Glycerol triglycidyl ether and γ-aminopropyltriethoxysilane were mixed and reacted in anhydrous conditions at a molar ratio of 1:3~4 until a homogeneous phase was obtained, yielding a carbon chain branched crosslinking agent.

2. The high displacement capacity silicone weather-resistant sealant according to claim 1, characterized in that: The hydroxyl-terminated polydimethylsiloxane has a viscosity of 10,000~500,000 MPa·s at 25°C; the methyl-terminated polydimethylsiloxane has a viscosity of 100~2,000 MPa·s at 25°C.

3. The high displacement capability silicone weather-resistant sealant according to claim 1, characterized in that: The nano-reinforcing material is one or more of the following: nano-sized calcium carbonate, heavy calcium carbonate, quartz powder, fumed silica, and precipitated silica.

4. The high displacement capacity silicone weather-resistant sealant according to claim 1, characterized in that: The chain extender is one or more of methyl vinyl di(N-methylacetamido)silane, methyl vinyl di(N-ethylacetamido)silane, methyl vinyl di(N-propylacetamido)silane, methyl vinyl di(N-methylpropionylamino)silane, methyl vinyl di(N-ethylpropionylamino)silane, and methyl vinyl di(N-propylpropionylamino)silane.

5. The high displacement capacity silicone weather-resistant sealant according to claim 1, characterized in that: The coupling agent is one or more of the following: γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, β-(3,4-epoxycyclohexane)ethyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, 3-(N-cyclohexylamino)propyltrimethoxysilane, N-(n-butyl)-3-aminopropyltriethoxysilane, and N-(n-butyl)-3-aminopropyltrimethoxysilane.

6. The high displacement capacity silicone weather-resistant sealant according to claim 1, characterized in that: The catalyst is one or more of dibutyltin dilaurate, dibutyldiphenyltin diacetate, and stannous octoate.

7. The high displacement capability silicone weather-resistant sealant according to claim 1, characterized in that: The temperature of the mixed reaction is 40~80℃, and the reaction time is 1~4h.

8. A method for preparing a high displacement capacity silicone weather-resistant sealant according to any one of claims 1 to 7, characterized in that: Includes the following steps: Hydroxyl-terminated polydimethylsiloxane, methyl-terminated polydimethylsiloxane, and nano-reinforcing materials were added to a kneader and heated to mix evenly. After vacuum dehydration and cooling, chain extender, crosslinking agent I, crosslinking agent II, coupling agent, and catalyst were added in sequence and mixed evenly. The mixture was then sealed and packaged to obtain a high displacement capacity silicone weather-resistant sealant.

9. The method for preparing a high displacement capacity silicone weather-resistant sealant according to claim 8, characterized in that: The heating and mixing process is carried out at a temperature of 100~120℃ for 1~4 hours.