Quick-drying silane modified polyether composition as well as preparation method and application thereof

Abstract

The invention provides a quick-drying silane modified polyether composition and a preparation method and application thereof, and belongs to the technical field of polyether adhesives, the composition comprises a main agent and a curing agent, the main agent comprises silane modified polyether resin, nano filler, a plasticizer, a water removal agent and polydopamine nano particles, and the curing agent comprises a curing agent and a silane modified polyether resin; the curing agent comprises an organic tin catalyst, a diamino silane coupling agent and a cocatalyst. The preparation method of the composition comprises the following steps: mixing the silane modified polyether resin, the plasticizer and the moisture scavenger to obtain a mixture 1; adding a nanofiller and polydopamine nanoparticles into the mixture 1 at room temperature, and degassing and dewatering to obtain a main agent; the preparation method comprises the following steps: mixing an organic tin catalyst, a diamino silane coupling agent and a cocatalyst, and uniformly stirring to obtain the curing agent, and mixing the main agent and the curing agent to obtain the silane modified polyether composition. The composition disclosed by the invention is short in curing time, high in mechanical strength and good in bonding force with a base material.

Description

Technical Field

[0001] The invention belongs to the technical field of polyether adhesives, and particularly relates to a quick-drying silane-modified polyether composition, a preparation method and an application thereof. Background Art

[0002] In the construction and industrial sectors, silane-modified polyether sealants, as a new generation of high-performance sealing materials, are gaining popularity due to their unique advantages. In particular, fast-drying silane-modified polyether compositions, known as rock slab adhesives, play a key role in rock slab installation. Rock slabs have low moisture content, large dimensions, and smooth, flat surfaces. Traditional cement-based tile adhesives struggle to meet these requirements, often leading to problems such as loose adhesion, hollowing, and even peeling. In contrast, rock slab adhesives offer advantages such as high strength, fast curing, excellent elasticity, and environmental friendliness. They effectively address rock slab installation challenges, shorten construction cycles, and improve efficiency.

[0003] However, the current fast-drying silane-modified polyether compositions still have some technical defects. From the perspective of curing time, although the curing speed of existing products is improved compared to traditional sealants, it is still insufficient in some large-scale projects with extremely high requirements for construction efficiency. Taking a large commercial complex project as an example, the existing rock slab adhesive is used for paving rock slabs. After each square meter of rock slab is paved, it takes a long time to wait before the next construction operation can be carried out, resulting in slow overall construction progress. Generally speaking, the existing fast-drying silane-modified polyether compositions take 1-2 days to fully cure under normal temperature and humidity conditions. This greatly affects the construction progress and increases labor costs for projects with tight schedules.

[0004] In terms of the degree of adhesion to the base material, existing rock slab adhesives also have certain problems. Due to the special nature of the rock slab material, some rock slab adhesives cannot achieve the ideal bonding strength after bonding with the rock slab. In some building exterior wall rock slab paving projects, after a period of wind, sun and rain, the rock slabs showed varying degrees of falling off. Testing found that the bonding force between the rock slab and the adhesive layer was insufficient and could not withstand the influence of external environmental factors. In addition, for some rock slabs with special surface treatments, such as those that have been polished, waxed, etc., the bonding effect of existing rock slab adhesives is even worse, which seriously limits its application in a variety of rock slab paving scenarios.

[0005] It can be seen that the rock slab glue in the existing technology has technical problems such as long curing time and weak bonding with the substrate. Summary of the Invention

[0006] In view of this, the present invention provides a quick-drying silane-modified polyether composition and its preparation method and application, in order to solve the technical problems of long curing time and low adhesion to the substrate in the prior art of rock slab glue.

[0007] To achieve the above-mentioned object of the invention, the present invention provides a fast-drying silane-modified polyether composition, comprising a main agent and a curing agent, wherein the main agent comprises a silane-modified polyether resin, a nanofiller, a plasticizer, a water scavenger and polydopamine nanoparticles, the curing agent comprises an organic tin catalyst, a bisaminosilane coupling agent and a co-catalyst, and the silane-modified polyether resin is a trimethoxysilane-terminated polyether prepolymer.

[0008] Preferably, the main agent comprises 40-60 parts by mass of silane-modified polyether resin, 20-28 parts by mass of nanofiller, 10-15 parts by mass of plasticizer, 0.8-1.5 parts by mass of water scavenger and 0.8-1.2 parts by mass of polypamine nanoparticles, and the curing agent comprises 0.5-1 parts by mass of organic tin catalyst, 1-4 parts by mass of bisaminosilane coupling agent and 0.1-0.5 parts by mass of co-catalyst.

[0009] Preferably, the nanofiller is a mixture of fumed silica and nano-calcium carbonate, the mass ratio of the fumed silica to the nano-calcium carbonate is 1:2-3, and the average particle size of the nano-calcium carbonate is 80-150 nm.

[0010] Preferably, the plasticizer is polypropylene glycol or diisodecyl phthalate, and the water scavenger is vinyltrimethoxysilane.

[0011] Preferably, the organotin catalyst is one or both of dibutyl di(acetylacetonato)tin and stannous octoate.

[0012] Preferably, the bisaminosilane coupling agent is N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and the co-catalyst is triethanolamine or dimethylethanolamine.

[0013] Preferably, the mass ratio of the main agent to the curing agent is 8-12:1.

[0014] A method for preparing the silane-modified polyether composition of the present invention comprises the following steps:

[0015] S1. Add silane-modified polyether resin to a planetary mixer, start stirring, add plasticizer, continue stirring for 30-40 minutes, raise the temperature to 50-60° C., add dewatering agent, stir for 30-40 minutes, and then vacuum degas (-0.09 MPa, 30 minutes) to obtain mixture 1;

[0016] S2, adding the nanofiller and polydopamine nanoparticles to the mixture 1 at room temperature, and degassing and removing moisture to obtain the main agent;

[0017] S3, mixing an organotin catalyst, a bisaminosilane coupling agent and a co-catalyst, and stirring evenly to obtain the curing agent;

[0018] S4. Evenly mix the main agent and the curing agent to obtain the silane-modified polyether composition.

[0019] Preferably, S2 further comprises adding the nanofiller into a silane coupling agent solution for modification.

[0020] Application of the silane-modified polyether composition of the present invention in tile adhesive.

[0021] In the present invention, the combination of trimethoxysilane-terminated polyether resin (highly active cross-linking group), bisaminosilane coupling agent (synergistic catalysis) and high-efficiency organic tin catalyst (such as KRA-2) significantly improves the cross-linking speed and achieves fast-drying performance; the nanofiller compound (fumed silica + nano-calcium carbonate) accelerates curing while ensuring flexibility and strength; the similarity between the plasticizer and the resin structure (such as PPG-3000) promotes molecular diffusion and shortens the curing time; at the same time, the addition of polydopamine nanoparticles improves the adsorption capacity of the composition to the rock slab.

[0022] Trimethoxysilane-terminated polyether resins contain ≥2 siloxy groups per molecule, providing a high density of crosslinking sites. The trimethoxy group offers minimal steric hindrance, allowing for rapid generation of Si-OH groups at room temperature, initiating the condensation reaction. The resin's molecular weight is controlled between 2000 and 3000 Da, resulting in flexible chain segment movement and low diffusion resistance during crosslinking, accelerating intermolecular entanglement and increasing crosslinking speed.

[0023] Tin atoms (Sn 2+ / Sn 4+ ) acts as a Lewis acid and can form a coordination bond with the oxygen atom in the silanol group (-SiOR), forming a five-membered ring or six-membered ring coordination intermediate. This process reduces the activation energy of the hydrolysis reaction by:

[0024] Polarized CO bond: The coordination effect increases the polarity of the CO bond of the silaneoxy group, reduces the bond energy, and makes it easier for the methoxy group (-OR) to leave, generating active silanol (-SiOH).

[0025] Directed arrangement of substrates: The catalyst aligns the silaneoxy groups and water molecules in a directional manner through coordination, reducing the reaction entropy barrier and accelerating the occurrence of the hydrolysis reaction.

[0026] Adding amine co-catalysts simultaneously with organic catalysts creates a synergistic effect. The amino groups (-NH2 / -NHR) of amine co-catalysts (such as triethanolamine and dimethylethanolamine) act as basic sites, synergistically accelerating the reaction through the following pathways:

[0027] Proton transfer catalysis: During the hydrolysis of silyl groups, amines act as proton acceptors (B:) to capture protons (H +), promote the forward reaction and avoid the inhibition of the reaction by proton accumulation. Optimize the activity window of the organotin catalyst to maximize its coordination ability.

[0028] When used together, the organotin catalyst and amine co-catalyst form a coordinated activation mechanism. The organotin catalyst is responsible for reducing the energy barrier to siloxyl hydrolysis, significantly increasing the rate of the reaction's rate-determining step (CO bond cleavage). The amine catalyst also directs proton transfer, compensating for the organotin catalyst's efficiency shortcomings in the proton transfer step and preventing it from becoming a bottleneck in the overall reaction. The two together form a "coordination activation-proton transfer" relay mechanism, increasing the apparent rate of the hydrolysis reaction and significantly shortening the open-dry time and cure cycle.

[0029] Polypropylene glycol (PPG-3000) has a similar structure to resin, which reduces intermolecular resistance and promotes the diffusion of catalyst and water vapor.

[0030] Nanofiller is a mixture of fumed silica and nano-calcium carbonate. Silica forms a network structure through hydrogen bonds to prevent the adhesive layer from sagging and accelerate surface film formation. Nano-calcium carbonate fills the micropores of the substrate to form mechanical interlocking and assist in building initial strength.

[0031] The main components of rock slabs are silica, alumina, etc., and their surfaces are rich in hydroxyl groups (-OH). The amino group (-NH2) of a bisaminosilane coupling agent (such as N-(2-aminoethyl)-3-aminopropyltrimethoxysilane) can undergo dehydration condensation with the hydroxyl groups on the surface of the rock slab to form a -Si-O-Al / -Si-O-Si covalent bond. At the same time, the other end of the amino group cross-links with the silanol (-SiOH) of the silane-modified polyether resin, forming a "glue layer-coupling agent-rock slab" chemical relay anchoring. At the same time, polydopamine nanoparticles are added. The catechol group of polydopamine forms coordination bonds or hydrogen bonds with metal oxides on the surface of the rock slab (such as CaO in marble and Al2O3 / SiO2 in granite), simulating the "molecular anchoring" effect of mussel byssus. Even if there is trace moisture or pollutants on the surface of the rock slab, strong adsorption can still be achieved by replacing water molecules. The nanoparticles are evenly distributed at the interface between the adhesive and the slab. After curing, they form an interpenetrating network of polydopamine-silane-modified polyether, mitigating the modulus difference between the slab (rigidity) and the adhesive (elasticity), reducing debonding caused by stress concentration. Furthermore, the double bond of the bisaminosilane coupling agent can interact with the conjugated structure of polydopamine to further enhance interfacial bonding.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. Improved efficient cross-linking and quick-drying performance

[0034] The synergistic effect of trimethoxysilane-terminated polyether resin, bisaminosilane coupling agent, and high-efficiency organotin catalysts (such as KRA-2) significantly increases crosslinking speed: trimethoxysilane-terminated polyether resin provides a high density of crosslinking sites within the molecular chain, and the trimethoxy group exhibits low steric hindrance, resulting in low crosslinking diffusion resistance and accelerated intermolecular entanglement. Organotin catalysts coordinate tin atoms with silanol oxygen atoms, polarizing CO bonds and orienting the substrate, thereby reducing the activation energy of the hydrolysis reaction. Amine cocatalysts (such as triethanolamine) act as proton acceptors to promote proton transfer, forming a "coordination activation-proton transfer" relay mechanism with organotin, increasing the apparent rate of the hydrolysis reaction and significantly shortening the surface-free time and cure cycle. Plasticizer PPG-3000, similar in structure to the resin, reduces intermolecular resistance, promotes diffusion of the catalyst and water vapor, and further synergistically accelerates cure.

[0035] 2. Optimization of mechanical properties and construction performance

[0036] Nano-filler compounding (fumed silica + nano-calcium carbonate) achieves performance balance:

[0037] Fumed silica forms a network structure through hydrogen bonding, preventing the adhesive layer from sagging and accelerating surface film formation. Nano-calcium carbonate fills the substrate's micropores, creating a mechanical interlock and aiding in initial strength development, ensuring the composite maintains both flexibility and structural strength while accelerating cure. The synergistic effect of the flexible chains of the trimethoxysilane-terminated polyether resin and the nano-fillers enables the cured adhesive layer to withstand dynamic stress while maintaining the required support strength for the rigid substrate, making it suitable for paving large-scale rock slabs.

[0038] 3. Enhanced interface bonding strength and adaptability

[0039] Multiple interface anchoring mechanisms significantly enhance the bonding strength with rock slabs:

[0040] The amino groups of the bisaminosilane coupling agent form a chemical relay anchoring mechanism (adhesive layer, coupling agent, and rock) with the surface of the rock. The catechol groups of the polydopamine nanoparticles form coordination or hydrogen bonds with the metal oxides on the rock surface, mimicking the "molecular anchoring" effect of mussel byssus threads. This displaces interfacial moisture or contaminants, achieving strong adsorption and reducing debonding caused by stress concentration, significantly improving interfacial bonding and durability. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions of the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The suppliers of the raw materials used in the specific embodiment are as follows:

[0043] Polypropylene glycol PPG was produced by Shandong Bluestar Dongda Co., Ltd., DL-3000D;

[0044] Stannous octoate is produced by Beijing Zhengheng Chemical;

[0045] 3-Isocyanatepropyltrimethoxysilane (IPTS) was produced by Nanjing Quanxi Chemical;

[0046] Polydopamine nanoparticles: 4-polydopamine nanoparticles, Jiangsu Xianfeng Nanomaterial Technology Co., Ltd., product number is 104785.

[0047] Preparation process of trimethoxysilane terminated polyether prepolymer;

[0048] (1) Add 100 g of dehydrated polypropylene glycol (PPG) into a flask, start stirring, introduce N2, and heat to 100°C;

[0049] (2) diluting 0.1 g of stannous octoate (SO) catalyst with anhydrous ethanol to a catalyst dilution solution with a mass fraction of 5%;

[0050] (3) Add all the catalyst dilution into the flask and stir for 10 minutes until evenly dispersed;

[0051] (4) Slowly add 24.7 g of 3-isocyanatepropyltrimethoxysilane (IPTS) dropwise at a rate of 8 mL / min (a dropwise addition rate may cause a sudden rise in system temperature and decomposition of IPTS).

[0052] (5) The reaction was carried out at a constant temperature of 100°C for 5 hours to obtain a trimethoxysilane-terminated polyether prepolymer.

[0053] Example 1

[0054] This embodiment provides a fast-drying silane-modified polyether composition, comprising a main agent and a curing agent in a mass ratio of 8:1, wherein the main agent comprises, by mass, 40 parts of a silane-modified polyether resin, 20 parts of a nanofiller, 15 parts of polypropylene glycol, 0.8 parts of vinyltrimethoxysilane, and 0.8 parts of polypamine nanoparticles; the curing agent comprises 1 part of dibutyl di(acetylacetonato)tin, 1 part of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and 0.5 parts of triethanolamine; and the silane-modified polyether resin is a trimethoxysilane-terminated polyether prepolymer.

[0055] The nanofiller is a mixture of fumed silica and nano-calcium carbonate, the mass ratio of the fumed silica to the nano-calcium carbonate is 1:2, the average particle size of the fumed silica is 60 nm, and the average particle size of the nano-calcium carbonate is 80 nm.

[0056] A method for preparing the silane-modified polyether composition described in this embodiment comprises the following steps:

[0057] S1. Add silane-modified polyether resin to a planetary mixer, start stirring, add polypropylene glycol, continue stirring for 30 minutes, raise the temperature to 50° C., add vinyltrimethoxysilane, stir for 30 minutes, and then degas under vacuum (-0.09 MPa, 30 minutes) to obtain mixture 1;

[0058] S2. Accurately weigh 2% of the silane coupling agent KH-550 by mass of the nanofiller, pour it into a clean container, mix it in a ratio of 1:7 by volume of the silane coupling agent and anhydrous ethanol, use a stirrer to stir at 300 rpm for 15 minutes to form a uniform silane coupling agent solution, slowly add the nanofiller to the silane coupling agent solution, stir while adding, increase the stirring speed to 400 rpm, and continue stirring for 50 minutes; transfer the mixed solution to a reactor with a condensing reflux device, heat it to 60 ° C, and react at this temperature for 3 hours. Keep stirring during the reaction, the stirring speed is controlled at 250 rpm, wash with ethanol 5 times, and obtain the modified nanofiller after drying;

[0059] S3, adding the modified nanofiller and polydopamine nanoparticles to the mixture 1 at room temperature, and degassing and removing moisture to obtain the main agent;

[0060] S4, mixing dibutyl di(acetylacetonato)tin, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and triethanolamine, and stirring evenly to obtain the curing agent;

[0061] S5. Evenly mix the main agent and the curing agent to obtain the silane-modified polyether composition.

[0062] Example 2

[0063] This embodiment provides a fast-drying silane-modified polyether composition, comprising a main agent and a curing agent in a mass ratio of 10:1, wherein the main agent comprises, by mass, 50 parts of a silane-modified polyether resin, 23 parts of a nanofiller, 13 parts of diisodecyl phthalate, 1.2 parts of vinyltrimethoxysilane, and 1 part of polypamine nanoparticles; the curing agent comprises 0.8 parts of stannous octoate, 3 parts of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and 0.3 parts of triethanolamine; and the silane-modified polyether resin is a trimethoxysilane-terminated polyether prepolymer.

[0064] The nanofiller is a mixture of fumed silica and nano-calcium carbonate, the mass ratio of the fumed silica to the nano-calcium carbonate is 1:2.5, the average particle size of the fumed silica is 60 nm, and the average particle size of the nano-calcium carbonate is 100 nm.

[0065] A method for preparing the silane-modified polyether composition described in this embodiment comprises the following steps:

[0066] S1. Add silane-modified polyether resin to a planetary mixer, start stirring, add diisodecyl phthalate, continue stirring for 35 minutes, raise the temperature to 55° C., add vinyltrimethoxysilane, stir for 35 minutes, and then degas in vacuo (−0.09 MPa, 30 minutes) to obtain mixture 1;

[0067] S2. Accurately weigh 2% of the silane coupling agent KH-550 by mass of the nanofiller, pour it into a clean container, mix it in a ratio of 1:7 by volume of the silane coupling agent and anhydrous ethanol, use a stirrer to stir at 300 rpm for 15 minutes to form a uniform silane coupling agent solution, slowly add the nanofiller to the silane coupling agent solution, stir while adding, increase the stirring speed to 400 rpm, and continue stirring for 50 minutes; transfer the mixed solution to a reactor with a condensing reflux device, heat it to 60°C, and react at this temperature for 3 hours. Keep stirring during the reaction, and control the stirring speed at 250 rpm. After washing and drying, obtain the modified nanofiller;

[0068] S3, adding the modified nanofiller and polydopamine nanoparticles to the mixture 1 at room temperature, and degassing and removing moisture to obtain the main agent;

[0069] S4, mixing stannous octoate, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and triethanolamine, and stirring evenly to obtain the curing agent;

[0070] S5. Evenly mix the main agent and the curing agent to obtain the silane-modified polyether composition.

[0071] Example 3

[0072] This embodiment provides a fast-drying silane-modified polyether composition, comprising a main agent and a curing agent in a mass ratio of 12:1, wherein the main agent comprises, by mass, 60 parts of a silane-modified polyether resin, 28 parts of a nanofiller, 10 parts of diisodecyl phthalate, 1.5 parts of vinyltrimethoxysilane, and 1.2 parts of polypamine nanoparticles; the curing agent comprises 0.5 parts of stannous octoate, 4 parts of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and 0.1 parts of dimethylethanolamine; and the silane-modified polyether resin is a trimethoxysilane-terminated polyether prepolymer.

[0073] The nanofiller is a mixture of fumed silica and nano-calcium carbonate, the mass ratio of the fumed silica to the nano-calcium carbonate is 1:3, the average particle size of the fumed silica is 60 nm, and the average particle size of the nano-calcium carbonate is 150 nm.

[0074] A method for preparing the silane-modified polyether composition described in this embodiment comprises the following steps:

[0075] S1. Add silane-modified polyether resin to a planetary mixer, start stirring, add diisodecyl phthalate, continue stirring for 40 minutes, raise the temperature to 60° C., add vinyltrimethoxysilane, stir for 40 minutes, and then degas in vacuo (-0.09 MPa, 30 minutes) to obtain mixture 1;

[0076] S2. Accurately weigh 2% of the silane coupling agent KH-550 by mass of the nanofiller, pour it into a clean container, mix it in a ratio of 1:7 by volume of the silane coupling agent and anhydrous ethanol, use a stirrer to stir at 300 rpm for 15 minutes to form a uniform silane coupling agent solution, slowly add the nanofiller to the silane coupling agent solution, stir while adding, increase the stirring speed to 400 rpm, and continue stirring for 50 minutes; transfer the mixed solution to a reactor with a condensing reflux device, heat it to 60°C, and react at this temperature for 3 hours. Keep stirring during the reaction, and control the stirring speed at 250 rpm. After washing and drying, obtain the modified nanofiller;

[0077] S3, adding the modified nanofiller and polydopamine nanoparticles to the mixture 1 at room temperature, and degassing and removing moisture to obtain the main agent;

[0078] S4, mixing stannous octoate, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and dimethylethanolamine, and stirring evenly to obtain the curing agent;

[0079] S5. Evenly mix the main agent and the curing agent to obtain the silane-modified polyether composition.

[0080] Comparative Example 1

[0081] This comparative example is similar to Example 1, except that the silane-modified polyether resin in this comparative example is replaced by a silane-modified polyether resin, S203H, sold by Kaneka Trading (Shanghai) Co., Ltd.

[0082] Comparative Example 2

[0083] This comparative example is similar to Example 1, except that the curing agent in this comparative example is dibutyltin dilaurate.

[0084] Comparative Example 3

[0085] This comparative example is similar to Example 1, except that the mass fraction of polypamine nanoparticles in this comparative example is 0.5 parts.

[0086] Comparative Example 4

[0087] This comparative example is similar to Example 1, except that the mass fraction of polypamine nanoparticles in this comparative example is 2 parts.

[0088] The compositions of Examples 1-3 and Comparative Examples 1-4 were tested for performance, including surface dry time, 2-hour tensile strength, and adhesion and durability.

[0089] Tack-free time: Tested according to GB / T 13477.5-2002, record the time it takes for the surface of the mixed rubber to become tack-free. Test data is shown in Table 1.

[0090] Table 1: Tack-free time of each composition

[0091]

[0092] 2-hour tensile strength: I-shaped parts were prepared according to GB / T 13477.8-2017, and the tensile strength was tested after 2 hours. The test results are shown in Table 2.

[0093] Table 2 2-hour tensile strength of each composition

[0094]

[0095] Adhesion and durability (characterized by tensile shear strength); the bonding strength of the composition to the rock slab substrate was tested according to GB / T 7124-2008. The test results are shown in Table 3.

[0096] Table 3 7d tensile shear strength of each composition

[0097]

[0098] It can be seen from the test results in Table 1, Table 2 and Table 3 that the technical solution of the present invention has good technical effects, wherein too much or too little addition of polydopamine nanoparticles will affect the performance of the composition.

[0099] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A quick-drying silane-modified polyether composition, characterized in that: The invention comprises a main agent and a curing agent, wherein the main agent comprises a silane-modified polyether resin, a nanofiller, a plasticizer, a water scavenger and polydopamine nanoparticles; the curing agent comprises an organic tin catalyst, a bisaminosilane coupling agent and a co-catalyst; and the silane-modified polyether resin is a trimethoxysilane-terminated polyether prepolymer.

2. A quick-drying silane-modified polyether composition according to claim 1, characterized in that, The main agent comprises 40-60 parts by weight of silane-modified polyether resin, 20-28 parts by weight of nanofiller, 10-15 parts by weight of plasticizer, 0.8-1.5 parts by weight of water scavenger and 0.8-1.2 parts by weight of polypamine nanoparticles; the curing agent comprises 0.5-1 parts by weight of organic tin catalyst, 1-4 parts by weight of bisaminosilane coupling agent and 0.1-0.5 parts by weight of co-catalyst.

3. A quick-drying silane-modified polyether composition according to claim 1 or 2, characterized in that: The nano filler is a mixture of fumed silica and nano calcium carbonate, the mass ratio of the fumed silica to the nano calcium carbonate is 1:2-3, and the average particle size of the nano calcium carbonate is 80-150 nm.

4. A quick-drying silane-modified polyether composition according to claim 1, characterized in that, The plasticizer is polypropylene glycol or diisodecyl phthalate, and the water scavenger is vinyl trimethoxy silane.

5. A quick-drying silane-modified polyether composition according to claim 1, characterized in that, The organic tin catalyst is one or both of dibutyl di(acetylacetonato)tin and stannous octoate.

6. A quick-drying silane-modified polyether composition according to claim 5, characterized in that: The bisaminosilane coupling agent is N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and the co-catalyst is triethanolamine or dimethylethanolamine.

7. A quick-drying silane-modified polyether composition according to claim 1, characterized in that: The mass ratio of the main agent to the curing agent is 8-12:

1.

8. A method for preparing the silane-modified polyether composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Add silane-modified polyether resin to a planetary mixer, start stirring, add plasticizer, continue stirring for 30-40 minutes, raise the temperature to 50-60° C., add dehydrating agent, stir for 30-40 minutes, and then vacuum degas to obtain mixture 1; S2, adding the nanofiller and polydopamine nanoparticles to the mixture 1 at room temperature, and degassing and removing moisture to obtain the main agent; S3, mixing an organotin catalyst, a bisaminosilane coupling agent and a co-catalyst, and stirring evenly to obtain the curing agent; S4. Evenly mix the main agent and the curing agent to obtain the silane-modified polyether composition.

9. The preparation method according to claim 8, characterized in that S2 further includes adding the nanofiller into a silane coupling agent solution for modification.

10. Use of the silane-modified polyether composition according to any one of claims 1 to 7 in tile adhesive.

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