Dealcoholized silicone sealant having high tear strength and fatigue resistance, and preparation method therefor

Abstract

The present invention provides a dealcoholized silicone sealant having high tear strength and fatigue resistance, and a preparation method therefor. The silicone sealant comprises: 100 parts of α,ω-dihydroxy polysiloxane, 20-40 parts of polyborosiloxane, 5-15 parts of simethicone, 70-140 parts of nano active calcium carbonate, 3-7 parts of a cross-linking agent, 1-3 parts of a compound coupling agent, 2-5 parts of a titanate vulcanizing agent A, and 2-4 parts of a titanate vulcanizing agent B. In the method, polyborosiloxane and α,ω-dihydroxy polysiloxane are used as basic polymers, compounded with the titanate vulcanizing agent, and used in cooperation with a filler, a cross-linking agent, a coupling agent, etc., so as to obtain the dealcoholized silicone sealant which has relatively high tear strength and excellent fatigue resistance, and also does not have a significant negative impact on the mechanical properties, such as tack-free time, tensile strength, and elongation at break, and bonding properties of the silicone sealant. The present invention further overcomes the defects of the mechanical fatigue resistance and tear resistance of existing silicone sealant being poor.

Description

A high tear strength and fatigue-resistant de-alcoholized silicone sealant and its preparation method Technical Field

[0001] This invention relates to the field of silicone sealants, and particularly to a de-alcoholized silicone sealant with high tear strength and fatigue resistance, and its preparation method. Background Technology

[0002] De-alcoholized one-component condensation-type room temperature vulcanizing liquid (RTV-1) silicone rubber is a paste-like substance made by mixing α,ω-polydimethylsiloxane as a base polymer with crosslinking agents, fillers, plasticizers, coupling agents, and catalysts in a moisture-proof container. It cures at room temperature by reacting with water in the air to form an elastic silicone rubber. It has many excellent properties such as a wide operating temperature range, excellent weather resistance, good electrical insulation properties, excellent biocompatibility, and good adhesion to materials.

[0003] Silicone weather-resistant sealant for construction is a functional building material embedded in building joints to achieve a sealing effect by withstanding joint displacement. It is widely used for sealing joints in glass curtain walls, aluminum panel curtain walls, stone curtain walls, and other curtain wall applications. In actual use environments, temperature changes and structural deformation can cause variations in the width of the joints between panels. This means the sealant must also withstand cyclical stress changes, making its durability particularly important. When gaps exist in the joint due to construction or external factors, insufficient tear resistance can easily lead to sealant failure under long-term displacement and deformation. Therefore, improving the mechanical fatigue resistance and tear resistance of silicone weather-resistant sealants is crucial for their service quality and lifespan. Summary of the Invention

[0004] This invention provides a de-alcoholized silicone sealant with high tear strength and fatigue resistance, and its preparation method, with the aim of solving the problems of mechanical fatigue resistance and tear resistance of existing silicone sealants.

[0005] To achieve the above objectives, embodiments of the present invention provide a high tear strength and fatigue resistance de-alcoholized silicone sealant and its preparation method. The present invention uses polyborosiloxane and α,ω-dihydroxypolysiloxane as base polymers, and employs a compounded titanate vulcanizing agent. Furthermore, it combines polymers, fillers, crosslinking agents, coupling agents, etc., in a de-alcoholized silicone sealant system to obtain a de-alcoholized silicone sealant. This results in high tear strength and excellent fatigue resistance, without significantly negatively impacting the surface drying time, tensile strength, elongation at break, and other mechanical and adhesive properties of the silicone sealant.

[0006] Embodiments of the present invention provide a high tear strength and fatigue-resistant de-alcoholized silicone sealant, comprising the following components by weight:

[0007] Preferably, the viscosity of the α,ω-dihydroxypolysiloxane at 25°C is 40,000–60,000 mPa·s.

[0008] Preferably, the viscosity of the polyborosiloxane at 25°C is 40,000–60,000 mPa·s.

[0009] Preferably, the viscosity of the dimethyl silicone oil at 25°C is 100–1000 mPa·s.

[0010] Preferably, the particle size of the nano-active calcium carbonate is 100–140 nm.

[0011] Preferably, the crosslinking agent is at least one selected from methyltrimethoxysilane, methyltriethoxysilane, propyltrimethoxysilane, and propyltriethoxysilane.

[0012] Preferably, the complex coupling agent is at least two of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, N-β-aminoethylγ-aminopropyltriethoxysilane, glycidyltriethoxysilane, and glycidyltrimethoxysilane.

[0013] Preferably, the titanate sulfiding agent A is a diisopropoxytitanium bis(ethyl acetoacetate) chelate.

[0014] Preferably, the titanate ester curing agent B is isopropyl tristearate titanate.

[0015] Based on a general inventive concept, embodiments of the present invention also provide a method for preparing the above-mentioned alcohol-free silicone sealant, comprising the following steps:

[0016] S1: Add α,ω-dihydroxypolysiloxane, polyborosiloxane, dimethyl silicone oil, and nano-activated calcium carbonate to a kneader at a temperature of 80-150℃ and a vacuum of -0.06--0.099MPa for 30-300 minutes to dehydrate and blend. After obtaining the base material, cool it for later use.

[0017] S2: At room temperature, the base material is added to a planetary mixer or a high-speed dispersing mixer, and then the crosslinking agent is added to the planetary mixer or high-speed dispersing mixer and reacted with the base material under a vacuum of -0.02 to 0.04 MPa and a speed of 10 to 800 rpm for 5 to 30 minutes.

[0018] S3: Add the compound coupling agent, titanate curing agent A and titanate curing agent B to a planetary mixer or high-speed dispersion mixer and react them together with the base material in a vacuum of -0.06 to -0.099 MPa and a speed of 10 to 800 rpm for 30 to 120 minutes to prepare the de-alcoholized silicone sealant.

[0019] The above-described solution of the present invention has the following beneficial effects:

[0020] This invention provides a method for preparing a silicone sealant with high tear strength and fatigue resistance, overcoming the shortcomings of existing silicone sealants in terms of poor mechanical fatigue resistance and tear resistance. By introducing polyborosiloxane (PBDMS) as the base polymer, PBDMS is an amorphous cross-linked network structure based on boron-oxygen dynamic bonds. In its natural state, it is very soft. With increasing external impact load, the shear-hardening adhesive can undergo a phase transition from a viscous flow state to a highly elastic state, and even a glassy state, thus better resisting impact deformation and absorbing impact energy. When the impact load disappears, it not only returns to its initial viscous flow state but also re-bonds after fracture, exhibiting a certain degree of self-healing properties, thus possessing excellent fatigue resistance and tear resistance. In addition, isopropyl tristearate titanate was introduced as a compound vulcanizing agent. Its saturated long-chain fatty acids can effectively coat and modify the surface of nano-calcium carbonate particles. At the same time, it is introduced into the polymer through vulcanizing agent molecules, avoiding the disadvantages of poor system compatibility and easy precipitation caused by directly adding stearic acid. It effectively enhances the interaction between organic polymer and inorganic particles, making them more tightly bound, and can also improve the mechanical fatigue resistance and tear resistance of silicone sealant to a certain extent. Detailed Implementation

[0021] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with specific embodiments.

[0022] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0023] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0024] To address the existing problems, embodiments of the present invention provide a high tear strength and fatigue-resistant de-alcoholized silicone sealant, comprising the following components by weight:

[0025] Preferably, the viscosity of the α,ω-dihydroxypolysiloxane at 25°C is 40,000–60,000 mPa·s.

[0026] Preferably, the viscosity of the polyborosiloxane at 25°C is 40,000–60,000 mPa·s.

[0027] Preferably, the viscosity of the dimethyl silicone oil at 25°C is 100–1000 mPa·s.

[0028] Preferably, the particle size of the nano-active calcium carbonate is 100–140 nm.

[0029] Preferably, the crosslinking agent is at least one selected from methyltrimethoxysilane, methyltriethoxysilane, propyltrimethoxysilane, and propyltriethoxysilane.

[0030] Preferably, the complex coupling agent is at least two of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, N-β-aminoethylγ-aminopropyltriethoxysilane, glycidyltriethoxysilane, and glycidyltrimethoxysilane.

[0031] Preferably, the titanate sulfiding agent A is a diisopropoxytitanium bis(ethyl acetoacetate) chelate.

[0032] Preferably, the titanate ester curing agent B is isopropyl tristearate titanate.

[0033] Based on a general inventive concept, embodiments of the present invention also provide a method for preparing the above-mentioned alcohol-free silicone sealant, comprising the following steps:

[0034] S1: Add α,ω-dihydroxypolysiloxane, polyborosiloxane, dimethyl silicone oil, and nano-activated calcium carbonate to a kneader at a temperature of 80-150℃ and a vacuum of -0.06--0.099MPa for 30-300 minutes to dehydrate and blend. After obtaining the base material, cool it for later use.

[0035] S2: At room temperature, the base material is added to a planetary mixer or a high-speed dispersing mixer, and then the crosslinking agent is added to the planetary mixer or high-speed dispersing mixer and reacted with the base material under a vacuum of -0.02 to 0.04 MPa and a speed of 10 to 800 rpm for 5 to 30 minutes.

[0036] S3: Add the compound coupling agent, titanate curing agent A and titanate curing agent B to a planetary mixer or high-speed dispersion mixer and react them together with the base material in a vacuum of -0.06 to -0.099 MPa and a speed of 10 to 800 rpm for 30 to 120 minutes to prepare the de-alcoholized silicone sealant.

[0037] The following is a detailed description through specific embodiments.

[0038] Example 1

[0039] This embodiment provides a method for preparing a dealcohol-based silicone sealant with high tear strength and fatigue resistance.

[0040] The method in this embodiment specifically includes the following steps:

[0041] Step 1: Add 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 40000 mPa·s, 25 parts of polyborosiloxane with a viscosity of 50000 mPa·s, 10 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0042] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0043] Step 3: 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate, and 2.5 parts of isopropyl tristearate titanate were chemically reacted for 40 minutes under a vacuum of -0.09 MPa and a rotation speed of 300 rpm to prepare an alcohol-based silicone sealant.

[0044] Example 2

[0045] This embodiment provides a method for preparing a dealcohol-based silicone sealant with high tear strength and fatigue resistance.

[0046] The method in this embodiment specifically includes the following steps:

[0047] Step 1: Add 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 45000 mPa·s, 30 parts of polyborosiloxane with a viscosity of 50000 mPa·s, 10 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0048] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0049] Step 3: Prepare an alcohol-based silicone sealant by chemically reacting 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate, and 3 parts of isopropyl tristearate titanate under a vacuum of -0.09 MPa and a rotation speed of 300 rpm for 40 minutes.

[0050] Example 3

[0051] This embodiment provides a method for preparing a dealcohol-based silicone sealant with high tear strength and fatigue resistance.

[0052] The method in this embodiment specifically includes the following steps:

[0053] Step 1: Add 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 50000 mPa·s, 35 parts of polyborosiloxane with a viscosity of 50000 mPa·s, 10 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0054] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0055] Step 3: Prepare an alcohol-based silicone sealant by chemically reacting 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate, and 3 parts of isopropyl tristearate titanate under a vacuum of -0.09 MPa and a rotation speed of 300 rpm for 40 minutes.

[0056] Example 4

[0057] This embodiment provides a method for preparing a dealcohol-based silicone sealant with high tear strength and fatigue resistance.

[0058] The method in this embodiment specifically includes the following steps:

[0059] Step 1: Add 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 55000 mPa·s, 35 parts of polyborosiloxane with a viscosity of 50000 mPa·s, 15 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0060] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0061] Step 3: Mix 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate, and 3.5 parts of isopropyl tristearate titanate under a vacuum of -0.09 MPa and a rotation speed of 300 rpm for 40 minutes to prepare an alcohol-based silicone sealant.

[0062] Example 5

[0063] This embodiment provides a method for preparing a dealcohol-based silicone sealant with high tear strength and fatigue resistance.

[0064] The method in this embodiment specifically includes the following steps:

[0065] Step 1: Add 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 60000 mPa·s, 40 parts of polyborosiloxane with a viscosity of 50000 mPa·s, 15 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0066] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0067] Step 3: Mix 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate, and 3.5 parts of isopropyl tristearate titanate under a vacuum of -0.09 MPa and a rotation speed of 300 rpm for 40 minutes to prepare an alcohol-based silicone sealant.

[0068] Comparative Example 1

[0069] This comparative example provides a method for preparing a silicone sealant, which differs from the examples in that only polyborosiloxane is added, without the addition of isopropyl tristearate titanate. The method specifically includes the following steps:

[0070] Step 1: Add 100 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 50000 mPa·s, 30 parts of polyborosiloxane with a viscosity of 50000 mPa·s, 10 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0071] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0072] Step 3: 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, and 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate are reacted chemically for 40 minutes under a vacuum of -0.09 MPa and a rotation speed of 300 rpm to prepare an alcohol-based silicone sealant.

[0073] Comparative Example 2

[0074] This comparative example provides a method for preparing a silicone sealant, which differs from the examples in that only isopropyl tristearate titanate is added, without the addition of polyborosiloxane. The method specifically includes the following steps:

[0075] Step 1: Add 100 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 50000 mPa·s, 5 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃ and the vacuum degree is -0.095 MPa. Dehydrate and blend for 180 minutes. After obtaining the base material, cool it for later use.

[0076] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 10 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0077] Step 3: 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate, and 3.5 parts of isopropyl tristearate titanate are reacted chemically for 40 minutes under a vacuum of -0.09 MPa and a rotation speed of 300 rpm to prepare an alcohol-based silicone sealant.

[0078] Comparative Example 3

[0079] This comparative example provides a method for preparing a silicone sealant, which differs from the examples in that neither polyborosiloxane nor isopropyl tristearate titanate is added. The method specifically includes the following steps:

[0080] Step 1: Add 100 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 50000 mPa·s, 10 parts of dimethyl silicone oil with a viscosity of 500 mPa·s, and 110 parts of nano-activated calcium carbonate with a particle size of 120 nm to a kneader. The temperature is 120℃, the vacuum degree is -0.095 MPa, and the mixture is dehydrated and blended for 180 minutes. After obtaining the base material, cool it for later use.

[0081] Step 2: At room temperature, add the base material obtained above into a planetary mixer or high-speed dispersing mixer, and then add 5 parts of methyltrimethoxysilane into the planetary mixer or high-speed dispersing mixer and react with the base material under a vacuum of -0.04MPa and a speed of 150rpm for 15 minutes.

[0082] Step 3: 2 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of γ-glycidyl etheroxypropyltrimethoxysilane, and 3 parts of diisopropoxytitanium bis(ethyl acetoacetate) chelate are reacted chemically for 40 minutes under a vacuum of -0.09 MPa and a rotation speed of 300 rpm to prepare an alcohol-based silicone sealant.

[0083] Performance testing:

[0084] The tensile bond strength, bond failure area, and elongation at maximum tensile strength at 23°C of the silicone sealants in the above examples and comparative examples were tested according to the tensile bond strength test requirements in GB 16776-2005. Tear strength testing was conducted according to ASTM D624, and the test results are shown in Table 1 below.

[0085] The test method for mechanical fatigue resistance includes the following procedures:

[0086] First, the silicone weather-resistant sealant used in the above examples and comparative examples was prepared into H-type specimens according to GB / T 13477.8-2017 Test Methods for Building Sealing Materials Part 8: Determination of Tensile Adhesion. These specimens were then cured for 28 days under standard conditions of 23 (±2)℃ and 50 (±10)% relative humidity. A tensile-compression cyclic fatigue mode was set on a tensile fatigue machine, subjecting the H-type specimens to repeated tension and compression, with tensile and compression displacements of ±35%, and a fatigue cycle of 600s. The fatigue test results were judged according to the national standard GB / T 13477.10-2017 Test Methods for Building Sealing Materials Part 10: Determination of Tensile Adhesion, checking whether cohesive or adhesive failure occurred in the specimen. When the specimen failure depth > 2mm, the fatigue test was considered complete, and the number of fatigue cycles was recorded and reported.

[0087] Table 1

[0088] As shown in Table 1, by comparing Examples 1, 2, 3, 4, 5 with Comparative Examples 2, 3, it can be seen that the polyborosiloxane introduced in this invention can improve the tensile strength of silicone sealant. By comparing Examples 1, 2, 3, 4, 5 with Comparative Examples 1, 3, it can be seen that isopropyl tristearate titanate can improve the elongation at maximum tensile strength of silicone sealant. By comparing Examples 1, 2, 3, 4, 5 with Comparative Examples 1, 2, 3, it can be seen that the polyborosiloxane and isopropyl tristearate titanate introduced in this invention, when used alone, can improve the tear strength and fatigue resistance of silicone sealant; when used synergistically, they can further improve the tear strength and fatigue resistance of silicone sealant.

[0089] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high tear strength and fatigue-resistant de-alcoholized silicone sealant, characterized in that, Based on parts by weight, it includes the following components:

2. The de-alcoholized silicone sealant according to claim 1, characterized in that, The viscosity of the α,ω-dihydroxypolysiloxane at 25°C is 40,000–60,000 mPa·s.

3. The de-alcoholized silicone sealant according to claim 1, characterized in that, The viscosity of the polyborosiloxane at 25°C is 40,000–60,000 mPa·s.

4. The de-alcoholized silicone sealant according to claim 1, characterized in that, The viscosity of the dimethyl silicone oil at 25°C is 100–1000 mPa·s.

5. The de-alcoholized silicone sealant according to claim 1, characterized in that, The particle size of the nano-active calcium carbonate is 100–140 nm.

6. The de-alcoholized silicone sealant according to claim 1, characterized in that, The crosslinking agent is at least one of methyltrimethoxysilane, methyltriethoxysilane, propyltrimethoxysilane, and propyltriethoxysilane.

7. The de-alcoholized silicone sealant according to claim 1, characterized in that, The complex coupling agent is at least two of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, N-β-aminoethylγ-aminopropyltriethoxysilane, glycidyltriethoxysilane, and glycidyltrimethoxysilane.

8. The de-alcoholized silicone sealant according to claim 1, characterized in that, The titanate ester sulfiding agent A is a diisopropoxytitanium bis(ethyl acetoacetate) chelate.

9. The de-alcoholized silicone sealant according to claim 1, characterized in that, The titanate vulcanizing agent B is isopropyl tristearate titanate.

10. The method for preparing the dealcoholized silicone sealant according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Add α,ω-dihydroxypolysiloxane, polyborosiloxane, dimethyl silicone oil, and nano-activated calcium carbonate to a kneader at a temperature of 80-150℃ and a vacuum of -0.06--0.099MPa for 30-300 minutes to dehydrate and blend. After obtaining the base material, cool it for later use. S2: At room temperature, the base material is added to a planetary mixer or a high-speed dispersing mixer, and then the crosslinking agent is added to the planetary mixer or high-speed dispersing mixer and reacted with the base material under a vacuum of -0.02 to 0.04 MPa and a speed of 10 to 800 rpm for 5 to 30 minutes. S3: Add the compound coupling agent, titanate curing agent A and titanate curing agent B to a planetary mixer or high-speed dispersion mixer and react them together with the base material in a vacuum of -0.06 to -0.099 MPa and a speed of 10 to 800 rpm for 30 to 120 minutes to prepare the de-alcoholized silicone sealant.

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