Single-component silane modified polyether sealant as well as preparation method and application thereof

Abstract

The invention provides a single-component silane modified polyether sealant as well as a preparation method and application thereof. The single-component silane modified polyether sealant is prepared from the following raw materials in parts by weight: 280 to 300 parts of silane modified polyether resin, 100 to 130 parts of environment-friendly plasticizer, 500 to 550 parts of nano calcium carbonate, 10 to 30 parts of fumed silica, 3 to 5 parts of ultraviolet light absorber, 3 to 5 parts of light stabilizer, 3 to 5 parts of antioxidant, 15 to 20 parts of dewatering agent, 15 to 25 parts of silane coupling agent and 3 to 5 parts of catalyst. The single-component silane modified polyether sealant provided by the invention has excellent bonding performance to a metal substrate, has high hardness, high tensile strength, high elongation at break and high shear strength, is moderate in viscosity, is beneficial to conventional process construction, and has excellent comprehensive performance.

Description

Technical Field

[0001] The invention belongs to the technical field of polyether sealants, and in particular relates to a single-component silane-modified polyether sealant and a preparation method and application thereof. Background Art

[0002] Silane modified polyether sealant is a new type of sealant, mainly composed of base polymer silane modified polyether polymer, filler, catalyst and additives. Due to its excellent bonding performance, good paintability and stain resistance, it combines the advantages of polyurethane sealant and silicone sealant and is widely used in various industrial fields such as construction, automobiles, and electronic appliances.

[0003] CN112980375A discloses a one-component silane-modified polyether sealant and a preparation method thereof, wherein the preparation of the one-component silane-modified polyether sealant comprises the following components in parts by weight: 10-20 parts of silane-modified polyether resin A, 5-15 parts of silane-modified polyether resin B, 5-12 parts of plasticizer, 21-53 parts of reinforcing filler, 0.1-0.8 parts of antioxidant, 1-2 parts of dewatering agent, 5-10 parts of coupling agent and 0.1-0.5 parts of catalyst. The technical solution uses resins with different activities and new aliphatic alkylated esters to cooperate with other components to accelerate curing and crosslinking, improve the cohesion of the sealant, and improve the tensile strength and bonding strength, but its hardness and tensile strength are relatively low.

[0004] CN105176470A discloses a terminal silane polyether sealant and a preparation method thereof, wherein the terminal silane polyether sealant is composed of the following raw materials in terms of percentage by total weight of the raw materials: 30 to 50 parts of terminal silane polyether, 5 to 20 parts of plasticizer, 25 to 45 parts of reinforcing filler, 1 to 10 parts of pigment, 1 to 2 parts of ultraviolet light absorber, 1 to 2 parts of light stabilizer, 1 to 3 parts of crosslinking agent, 1 to 3 parts of tackifier, and 0.5 to 2 parts of catalyst; the crosslinking agent is polyethyl silicate Si40. The terminal silane polyether sealant provided by the technical solution has a high adhesive force to the substrate after curing, and the adhesiveness does not decrease significantly after water immersion, but the adhesive strength is low and needs to be further improved.

[0005] Therefore, it is necessary to develop a one-component silane-modified polyether sealant with high hardness, good bonding performance and excellent comprehensive performance. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a one-component silane-modified polyether sealant and a preparation method and application thereof. The one-component silane-modified polyether sealant has a fast curing speed and a short surface drying time, has excellent bonding properties to metal substrates, has high tensile strength, shear strength and elongation at break, and has moderate viscosity, is conducive to conventional process construction, and has excellent comprehensive performance.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a one-component silane-modified polyether sealant. The raw materials for preparing the one-component silane-modified polyether sealant include the following components in parts by weight: 280 to 300 parts (e.g., 282 parts, 284 parts, 286 parts, 288 parts, 290 parts, 292 parts, 294 parts, 296 parts or 298 parts, etc.) of a silane-modified polyether resin, 100 to 130 parts (e.g., 103 parts, 106 parts, 109 parts, 112 parts, 115 parts, 118 parts, 121 parts, 124 parts or 127 parts, etc.), nano calcium carbonate 500-550 parts (for example, 505 parts, 510 parts, 515 parts, 520 parts, 525 parts, 530 parts, 535 parts, 540 parts or 545 parts, etc.), fumed silica 10-30 parts (for example, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts or 28 parts, etc.), ultraviolet absorber 3-5 parts ( For example, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4.2 parts, 4.4 parts, 4.6 parts or 4.8 parts, etc.), 3-5 parts of light stabilizer (for example, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4.2 parts, 4.4 parts, 4.6 parts or 4.8 parts, etc.), 3-5 parts of antioxidant (for example, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4.2 parts, 4.4 parts, 4.6 parts or 4.8 parts, etc.), 15-20 parts of dehydrating agent ( For example, 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts or 19.5 parts, etc.), 15 to 25 parts of silane coupling agent (for example, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts or 24 parts, etc.) and 3 to 5 parts of catalyst (for example, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4.0 parts, 4.2 parts, 4.4 parts, 4.6 parts or 4.8 parts, etc.).

[0009] In the present invention, nano calcium carbonate is used as a reinforcing filler, and fumed silica is used as an auxiliary reinforcing filler, and the two synergistically play a reinforcing role, and a reasonable proportion of silane coupling agent, silane-modified polyether resin, ultraviolet absorber, light stabilizer, antioxidant, dewatering agent and catalyst are compounded. Through the coordination of each component, the prepared single-component silane-modified polyether sealant has a fast curing speed, a short surface drying time, excellent bonding performance to metal substrates, high tensile strength, shear strength and elongation at break, moderate viscosity, is conducive to conventional process construction, and has excellent comprehensive performance; the single-component silane-modified polyether sealant solves the problems of low mechanical properties, low shear strength, low hardness and poor bonding performance of traditional silane-modified polyether sealants; has excellent bonding effect on stainless steel substrates and aluminum substrates under the condition of no primer construction; has excellent weather resistance, aging performance, excellent tensile and compression recovery force and the like. The one-component silane-modified polyether sealant contains no solvent, no isocyanate, and no PVC. The product is non-toxic, odorless, pollution-free and environmentally friendly. It solidifies when exposed to moisture in the air. The raw material composition is relatively simple, the raw material cost is relatively moderate, and large-scale production can be achieved.

[0010] Preferably, the silane-modified polyether resin is a dimethoxysilane-terminated polyether resin.

[0011] Preferably, the viscosity of the silane-modified polyether resin at 25° C. is 10,000 to 80,000 MPa·s, for example, 20,000 MPa·s, 30,000 MPa·s, 40,000 MPa·s, 50,000 MPa·s, 60,000 MPa·s or 70,000 MPa·s.

[0012] Preferably, the modified silane polyether resin includes any one of SAX400 of Zhongyuan Chemical, SAX750 of Zhongyuan Chemical, S303H of Zhongyuan Chemical, S203H of Zhongyuan Chemical, HMS-1063 of Zhejiang Huangma Technology, HMS-1107 of Zhejiang Huangma Technology, HMS-1167 of Zhejiang Huangma Technology or HMS-1267 of Zhejiang Huangma Technology, or a combination of at least two thereof.

[0013] Preferably, the environmentally friendly plasticizer includes any one of polyether polyol, di(2-propylheptyl)phthalate (DIDP) or diisononyl phthalate (DINP) or a combination of at least two thereof.

[0014] Preferably, the polyether polyol is polyether polyol C2020.

[0015] Preferably, the nano calcium carbonate is active nano calcium carbonate.

[0016] Preferably, the whiteness of the active nano-calcium carbonate is 95% to 99%, for example, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99% or 99.5%, etc.

[0017] Preferably, the specific surface area of ​​the active nano calcium carbonate is 15 to 20 m 2 / g, for example 15.5m 2 / g, 16m 2 / g, 16.5m 2 / g, 17m 2 / g, 17.5m 2 / g, 18m 2 / g, 18.5m 2 / g, 19m 2 / g or 19.5m 2 / g, etc.

[0018] Preferably, the oil absorption value of the active nano-calcium carbonate is 20-30 mL / 100 g, for example, 21 mL / 100 g, 22 mL / 100 g, 23 mL / 100 g, 24 mL / 100 g, 25 mL / 100 g, 26 mL / 100 g, 27 mL / 100 g, 28 mL / 100 g or 29 mL / 100 g, etc.

[0019] In the present invention, the active nano calcium carbonate can be evenly dispersed with environmentally friendly plasticizers and other raw materials to improve the strength of the single-component silane-modified polyether sealant and increase the specific gravity. The specific surface area of ​​the active nano calcium carbonate is preferably 15 to 20 m 2 / g, the active nano-calcium carbonate has a small particle size and better dispersibility, and the one-component silane-modified polyether sealant obtained after dispersion and mixing is more uniform and delicate; if the specific surface area is too small, the active nano-calcium carbonate has a large particle size and poor dispersibility, and it is easy to form rough particles in the one-component silane-modified polyether sealant; but if the specific surface area is too high, the colloid viscosity is high, the extrusion property is worse, and the tensile elongation at break is low.

[0020] Preferably, the active nano-calcium carbonate includes any one of Japan Shiraishi CCR, Japan Zhuyuan SP, Guangxi Warner P150, Omya OMY 2T, Omya OMY 120 or Omya OMY 160, or a combination of at least two thereof.

[0021] Preferably, the specific surface area of ​​the fumed silica is 140 to 200 m 2 / g, for example 145m 2 / g, 150m 2 / g, 155m 2 / g, 160m 2 / g, 165m2 / g, 170m 2 / g, 175m 2 / g, 180m 2 / g, 185m 2 / g, 190m 2 / g or 195m 2 / g, etc.

[0022] In the present invention, the specific surface area of ​​the fumed silica increases, which can improve the tensile strength and elongation at break of the one-component silane-modified polyether sealant and has a good reinforcement effect. However, the increase in the specific surface area increases the viscosity of the one-component silane-modified polyether sealant, which is not conducive to construction.

[0023] In the present invention, the fumed silica is powdered fumed silica with a high specific surface area.

[0024] Preferably, the fumed silica includes any one of Cabot LM-150, Tokuyama QS-10, Tokuyama QS-102, Tokuyama QS-10LS or Evonik R-974, or a combination of at least two thereof.

[0025] Preferably, the ultraviolet absorber includes any one of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole or 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, or a combination of at least two thereof.

[0026] Preferably, the light stabilizer includes any one of bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly(1-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxypiperidine) succinate or poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6-tetramethyl-piperidinyl)imino]-1,6-hexanediol[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} or a combination of at least two thereof.

[0027] Preferably, the antioxidant includes any one of glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, diethylene thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] or tris[2,4-di-tert-butylphenyl] phosphite or a combination of at least two thereof.

[0028] Preferably, the desiccant comprises vinyltrimethoxysilane and / or vinyltriethoxysilane.

[0029] Preferably, the silane coupling agent includes any one of γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, oligomeric bisaminosilane, multifunctional aminosilane oligomer, triaminotrimethoxysilane or bis(trimethoxysilylpropyl)amine, or a combination of at least two thereof.

[0030] Preferably, the catalyst comprises any one or a combination of at least two of dibutyltin bis(acetylacetonate), dibutyltin dilaurate, dibutylbis(2,4-glutarato-O,O')-(OC-6-11)-tin or a reaction product of tetraethyl silicate and bis(acetyloxy)dibutyltinane.

[0031] Preferably, the raw materials for preparing the one-component silane-modified polyether sealant further include carbon black;

[0032] Preferably, the carbon black includes any one of HZ6004 series carbon black, HZ630 series carbon black, HZ7100 series carbon black or Orylon H30 carbon black, or a combination of at least two thereof.

[0033] Preferably, the weight proportion of carbon black in the raw materials for preparing the one-component silane-modified polyether sealant is 0 to 20 parts, for example, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts or 18 parts.

[0034] Preferably, the raw materials for preparing the one-component silane-modified polyether sealant further include a pigment colorant.

[0035] Preferably, the weight proportion of the pigment colorant in the raw materials for preparing the one-component silane-modified polyether sealant is 10-30 parts, for example, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts or 28 parts.

[0036] In the present invention, the one-component silane-modified polyether sealant can be prepared into different colors such as black, white, and gray by adding pigment colorants, and has a wider range of applications.

[0037] In a second aspect, the present invention provides a method for preparing a one-component silane-modified polyether sealant as described in the first aspect, wherein the one-component silane-modified polyether sealant comprises the following steps: the one-component silane-modified polyether sealant comprises the following steps: a silane-modified polyether resin, an environmentally friendly plasticizer, nano-calcium carbonate, fumed silica, an ultraviolet absorber, a light stabilizer, an antioxidant, a water scavenger, a silane coupling agent and a catalyst are mixed to obtain the one-component silane-modified polyether sealant.

[0038] Preferably, the one-component silane-modified polyether sealant specifically comprises the following steps:

[0039] (1) A silane-modified polyether resin, nano-calcium carbonate, optionally carbon black, optionally a pigment colorant, and fumed silica are mixed to obtain a first mixture.

[0040] (2) The first mixture obtained in step (1), an environmentally friendly plasticizer, an ultraviolet absorber, a light stabilizer and an antioxidant are mixed to obtain a second mixture.

[0041] (3) Mixing the second mixture obtained in step (2) with a dehydrating agent to obtain a third mixture.

[0042] (4) Mixing the third mixture obtained in step (3) with a silane coupling agent to obtain a fourth mixture.

[0043] (5) Mixing the fourth mixture obtained in step (4) with a catalyst to obtain the one-component silane-modified polyether sealant.

[0044] Preferably, the mixing in step (1) is carried out under a vacuum degree of -0.09 to 0.1 MPa (e.g., -0.08 MPa, -0.05 MPa, -0.02 MPa, 0.01 MPa, 0.04 MPa or 0.07 MPa, etc.).

[0045] Preferably, the mixing temperature in step (1) is 0-50°C, for example, 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C or 45°C.

[0046] Preferably, the mixing in step (1) is stirring mixing, and the stirring speed is 900-1000 r / min (for example, 910 r / min, 920 r / min, 930 r / min, 940 r / min, 950 r / min, 960 r / min, 970 r / min, 980 r / min or 990 r / min, etc.), and the time is 30-40 min (for example, 31 min, 32 min, 33 min, 34 min, 35 min, 36 min, 37 min, 38 min or 39 min, etc.).

[0047] Preferably, the mixing in step (2) comprises stirring and mixing at 0 to 50° C. (e.g., 5° C., 10° C., 15° C., 20° C., 25° C., 30° C., 35° C., 40° C., or 45° C., etc.) and a rotation speed of 900 to 1000 r / min (e.g., 910 r / min, 920 r / min, 930 r / min, 940 r / min, 950 r / min, 960 r / min, 970 r / min, 980 r / min, or 990 r / min, etc.) for 5 to 12 min (e.g., 6 min, 7 min, 8 min, 9 min, 10 min, or 11 min, etc.), and then heating to 110 to 130° C. (e.g., 112° C., 114° C., 116° C., 118° C., 120° C., 122 ℃, 124℃, 126℃ or 128℃, etc.), under the conditions of a vacuum degree of -0.09 to 0.1MPa (for example, -0.08MPa, -0.05MPa, -0.02MPa, 0.01MPa, 0.04MPa or 0.07MPa, etc.) and a rotation speed of 150 to 250r / min (for example, 160r / min, 170r / min, 180r / min, 190r / min, 200r / min, 210r / min, 220r / min, 230r / min or 240r / min, etc.), stirring and mixing for 2 to 3h (for example, 2.1h, 2.2h, 2.3h, 2.4h, 2.5h, 2.6h, 2.7h, 2.8h or 2.9h, etc.).

[0048] Preferably, the mixing in step (3), step (4) and step (5) is each independently carried out under a vacuum degree of -0.09 to 0.1 MPa (e.g., -0.08 MPa, -0.05 MPa, -0.02 MPa, 0.01 MPa, 0.04 MPa or 0.07 MPa, etc.).

[0049] Preferably, the mixing temperatures in step (3), step (4) and step (5) are each independently ≤45°C (eg, 15°C, 20°C, 25°C, 30°C or 35°C, etc.).

[0050] Preferably, the mixing in step (3) is stirring mixing, the stirring mixing speed is 400-500 r / min (for example, 410 r / min, 420 r / min, 430 r / min, 440 r / min, 450 r / min, 460 r / min, 470 r / min, 480 r / min or 490 r / min, etc.), and the stirring mixing time is 10-18 min, for example, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min or 17 min, etc.

[0051] Preferably, the mixing in step (4) is stirring mixing, the stirring mixing speed is 400-500 r / min (for example, 410 r / min, 420 r / min, 430 r / min, 440 r / min, 450 r / min, 460 r / min, 470 r / min, 480 r / min or 490 r / min, etc.), and the stirring mixing time is 10-18 min, for example, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min or 17 min, etc.

[0052] Preferably, the mixing in step (5) is stirring mixing, the stirring mixing speed is 400-500 r / min (for example, 410 r / min, 420 r / min, 430 r / min, 440 r / min, 450 r / min, 460 r / min, 470 r / min, 480 r / min or 490 r / min, etc.), and the stirring mixing time is 5-12 min, for example, 6 min, 7 min, 8 min, 9 min, 10 min or 11 min, etc.

[0053] In a third aspect, the present invention provides a use of the one-component silane-modified polyether sealant as described in the first aspect in bonding and sealing of joints.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The present invention uses nano calcium carbonate as a reinforcing filler and fumed silica as an auxiliary reinforcing filler, and the two work together to play a reinforcing role, and compound a reasonable proportion of silane coupling agent, silane modified polyether resin, ultraviolet absorber, light stabilizer, antioxidant, dewatering agent and catalyst. Through the coordination of each component, the prepared single-component silane modified polyether sealant has a fast curing speed and a short surface drying time, and has an excellent bonding effect on metal substrates such as stainless steel and aluminum substrates under the condition of no primer construction, and has high hardness, high tensile strength, high elongation at break and high shear strength, and moderate viscosity, which is conducive to conventional process construction and has excellent comprehensive performance. The 304 stainless steel shear strength of the single-component silane modified polyether sealant is 3.0-4.2MPa, the tensile strength is 2.7-3.5MPa, the elongation at break is 330%-430%, the hardness is 50-68HA, the viscosity is 225000-268000mpa·s, and the comprehensive performance is excellent. The problem of low mechanical properties, low shear strength, low elongation at break, low hardness and poor bonding performance of traditional silane-modified polyether sealants is solved. The one-component silane-modified polyether sealant has moderate viscosity, can be constructed using conventional sealant processes, can achieve primer-free bonding, has a simple construction process, is suitable for bonding and sealing of joints of automobile bodies, elevator cars, containers, ships, metal structures, mechanical equipment, etc., does not generate bubbles under high temperature and high humidity conditions, and is safe and environmentally friendly. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0057] Some of the raw materials for the following examples and comparative examples are as follows:

[0058] Active nano calcium carbonate: Guangxi Huana P150, whiteness ≥95%, specific surface area 17.5-19.5m 2 / g, oil absorption value is 27.0±3mL / 100g;

[0059] Active nano calcium carbonate: OMY 160;

[0060] Active nano calcium carbonate: OMY 120;

[0061] Carbon black: HZ6004 series carbon black, manufacturer: Tangyin Hangzhou New Materials Co., Ltd.;

[0062] Fumed silica: Cabot LM-150, with a specific surface area of ​​150±15m 2 / g;

[0063] Fumed silica: Evonik R-974, with a specific surface area of ​​150-190m2 / g, measured 175m 2 / g;

[0064] Fumed silica: Cabot LM-720, with a specific surface area of ​​100±20m 2 / g.

[0065] Example 1

[0066] The present embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The one-component silane-modified polyether sealant comprises the following components by weight: 290 parts of silane-modified polyether resin (SAX400 from Zhongyuan Chemical), 120 parts of environmentally friendly plasticizer (polyether polyol C2020), 500 parts of active nano-calcium carbonate (Guangxi Warner P150), 20 parts of carbon black (HZ6004 series carbon black), 30 parts of fumed silica (Cabot LM-150), and 100 parts of ultraviolet absorber. (2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole), 3 parts of light stabilizer (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate), 4 parts of antioxidant (glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate), 15 parts of dewatering agent (vinyltrimethoxysilane), 20 parts of silane coupling agent (γ-glycidyloxypropyltrimethoxysilane) and 4.5 parts of catalyst (dibutyltin dilaurate).

[0067] The preparation method of the one-component silane-modified polyether sealant is as follows:

[0068] (1) Adding silane-modified polyether resin, active nano-calcium carbonate, carbon black and fumed silica in a planetary stirring kettle in sequence, evacuating the mixture, stirring and mixing at high speed for 35 min at 25° C. and a vacuum degree of −0.09 MPa, with a stirring speed of 1000 r / min, taking a sample and scraping to check the appearance of the paste, the surface of which was fine and free of particles, to obtain a first mixture;

[0069] (2) adding an environmentally friendly plasticizer, an ultraviolet absorber, a light stabilizer and an antioxidant to the first mixture obtained in step (1) in sequence, stirring and mixing at high speed for 10 min at 25° C., the stirring speed is 1000 r / min, the temperature is raised to 120° C., and stirring and mixing at low speed for 2.5 hours at a stirring speed of 200 r / min under a vacuum degree of -0.09 MPa, to obtain a second mixture;

[0070] (3) cooling the second mixture obtained in step (2) to 40° C., filling with nitrogen to reduce the pressure, adding a dehydrating agent, evacuating, and stirring at medium speed for 15 min at 40° C. and a vacuum degree of -0.09 MPa at a speed of 500 r / min to obtain a third mixture;

[0071] (4) filling with nitrogen to reduce the pressure, adding a silane coupling agent to the third mixture obtained in step (3), evacuating the mixture, stirring and mixing at a medium speed of 500 r / min at 40° C. and a vacuum degree of −0.09 MPa for 15 min, to obtain a fourth mixture;

[0072] (5) Inflate with nitrogen to reduce the pressure, add a catalyst to the fourth mixture obtained in step (4), evacuate, and stir and mix at medium speed for 10 min at 40° C. and a vacuum degree of -0.09 MPa. The stirring speed is 500 r / min, and the formed paste is uniform, fine, and free of particles and gel, thereby obtaining the one-component silane-modified polyether sealant.

[0073] Example 2

[0074] The present embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The one-component silane-modified polyether sealant comprises the following components by weight: 285 parts of silane-modified polyether resin (Zhejiang Royal Madrid Technology HMS-1063), 110 parts of environmentally friendly plasticizer (di(2-propylheptyl)phthalate), and 110 parts of active nano-calcium carbonate (OMY 160), 500 parts of pigment colorant (titanium dioxide R902), 25 parts of fumed silica (Cabot LM-150), 30 parts of ultraviolet absorber (2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole), 3 parts of light stabilizer (bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate), 4 parts of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate), 15 parts of dehydrating agent (vinyl triethoxysilane), 20 parts of silane coupling agent (γ-glycidyloxypropyltrimethoxysilane) and 4 parts of catalyst (dibutyltin dilaurate).

[0075] The preparation method of the one-component silane-modified polyether sealant is as follows:

[0076] (1) Adding silane-modified polyether resin, active nano calcium carbonate, pigment colorant and fumed silica in a planetary stirring kettle in sequence, evacuating the mixture, stirring and mixing at high speed for 40 min at 35° C. and a vacuum degree of 0.01 MPa, with a stirring speed of 900 r / min, taking a sample and scraping to check the appearance of the paste, the surface of the paste was fine and free of particles, thereby obtaining a first mixture;

[0077] (2) adding an environmentally friendly plasticizer, an ultraviolet absorber, a light stabilizer and an antioxidant to the first mixture obtained in step (1) in sequence, stirring and mixing at 35° C. for 10 min at a speed of 900 r / min, heating to 120° C., stirring and mixing at a low speed of 250 r / min for 2 hours under a vacuum degree of 0.01 MPa, to obtain a second mixture;

[0078] (3) cooling the second mixture obtained in step (2) to 35° C., filling with nitrogen to reduce the pressure, adding a dehydrating agent, evacuating, and stirring at medium speed for 15 min at 35° C. and a vacuum degree of 0.01 MPa at a speed of 400 r / min to obtain a third mixture;

[0079] (4) adding nitrogen to reduce the pressure, adding a silane coupling agent to the third mixture obtained in step (3), evacuating the mixture, stirring and mixing at a medium speed of 450 r / min at 35° C. and a vacuum degree of 0.01 MPa for 15 min, and obtaining a fourth mixture;

[0080] (5) Inflate with nitrogen to reduce the pressure, add a catalyst to the fourth mixture obtained in step (4), evacuate, and stir and mix at medium speed for 10 min at 35° C. and a vacuum degree of 0.01 MPa. The stirring speed is 450 r / min, and the formed paste is uniform, fine, and free of particles and gel, thereby obtaining the one-component silane-modified polyether sealant.

[0081] Example 3

[0082] The present embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The one-component silane-modified polyether sealant comprises the following components by weight: 300 parts of silane-modified polyether resin (Zhejiang Royal Madrid Technology HMS-1167), 100 parts of environmentally friendly plasticizer (diisononyl phthalate), 500 parts of active nano calcium carbonate (Omya OMY120), 30 parts of fumed silica (Cabot LM-150), 100 parts of ultraviolet absorber (2- The invention discloses a novel novel nanostructured carbon foam and a nanostructured carbon foam. The nanostructured carbon foam is prepared by mixing 3 parts of a nanostructured carbon foam (bis(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole), 3 parts of a light stabilizer (bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate), 4 parts of an antioxidant (diethylenethiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 15 parts of a dehydrating agent (vinyltriethoxysilane), 20 parts of a silane coupling agent (γ-glycidyloxypropyltrimethoxysilane), and 4.5 parts of a catalyst (dibutyltin dilaurate).

[0083] The preparation method of the one-component silane-modified polyether sealant is as follows:

[0084] (1) Adding silane-modified polyether resin, active nano-calcium carbonate and fumed silica in a planetary stirring kettle in sequence, evacuating the kettle, stirring and mixing at high speed for 35 min at 30° C. and a vacuum degree of −0.09 MPa, with a stirring speed of 1000 r / min, taking a sample and scraping to check the appearance of the paste, the surface of which was fine and free of particles, to obtain a first mixture;

[0085] (2) adding an environmentally friendly plasticizer, an ultraviolet absorber, a light stabilizer and an antioxidant to the first mixture obtained in step (1) in sequence, stirring and mixing at high speed for 10 min at 30° C., the stirring speed is 900 r / min, the temperature is raised to 120° C., and stirring and mixing at low speed for 2.5 hours at a stirring speed of 150 r / min under a vacuum degree of -0.09 MPa, to obtain a second mixture;

[0086] (3) cooling the second mixture obtained in step (2) to 40° C., filling with nitrogen to reduce the pressure, adding a dehydrating agent, evacuating, and stirring at medium speed for 15 min at 40° C. and a vacuum degree of -0.09 MPa at a speed of 500 r / min to obtain a third mixture;

[0087] (4) filling with nitrogen to reduce the pressure, adding a silane coupling agent to the third mixture obtained in step (3), evacuating the mixture, stirring and mixing at a medium speed of 400 r / min for 15 min at 40° C. and a vacuum degree of −0.09 MPa, to obtain a fourth mixture;

[0088] (5) Inflate with nitrogen to reduce the pressure, add a catalyst to the fourth mixture obtained in step (4), evacuate, and stir and mix at medium speed for 10 min at 40° C. and a vacuum degree of -0.09 MPa. The stirring speed is 400 r / min, and the formed paste is uniform, fine, and free of particles and gel, thereby obtaining the one-component silane-modified polyether sealant.

[0089] Example 4

[0090] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between the one-component silane-modified polyether sealant and the embodiment 1 is that the one-component silane-modified polyether sealant comprises the following components by weight: 290 parts of silane-modified polyether resin (SAX400 of Zhongyuan Chemical), 120 parts of environmentally friendly plasticizer (polyether polyol C2020), 500 parts of active nano calcium carbonate (Guangxi Warner P150), 20 parts of carbon black (Olilong H30 carbon black), 30 parts of fumed silica (Evonik R-974), and 100 parts of ultraviolet absorber ( 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole), 5 parts of a light stabilizer (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate), 3 parts of an antioxidant (glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate), 20 parts of a water dewatering agent (vinyltrimethoxysilane), 20 parts of a silane coupling agent (γ-glycidyloxypropyltrimethoxysilane) and 3 parts of a catalyst (dibutyltin dilaurate), and other conditions are the same as in Example 1.

[0091] Example 5

[0092] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and Embodiment 1 is that the weight fraction of carbon black (HZ6004 series carbon black) is adjusted to 10 parts, and other conditions are the same as those of Embodiment 1.

[0093] Example 6

[0094] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and embodiment 1 is that the weight fraction of carbon black (HZ6004 series carbon black) is adjusted to 30 parts, and other conditions are the same as those in embodiment 1.

[0095] Example 7

[0096] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and embodiment 1 is that the weight fraction of fumed silica (Cabot LM-150) is adjusted to 20 parts, and other conditions are the same as those in embodiment 1.

[0097] Example 8

[0098] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and embodiment 1 is that the weight fraction of fumed silica (Cabot LM-150) is adjusted to 10 parts, and other conditions are the same as those in embodiment 1.

[0099] Example 9

[0100] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and Embodiment 1 is that the weight portion of active nano-calcium carbonate (Guangxi Warner P150) is adjusted to 525 parts, and other conditions are the same as those in Embodiment 1.

[0101] Example 10

[0102] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof, which differs from Example 1 only in that the weight fraction of active nano-calcium carbonate (Guangxi Warner P150) is adjusted to 550 parts, and other conditions are the same as those in Example 1.

[0103] Embodiment 11

[0104] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and Example 1 is that the silane coupling agent (γ-glycidyloxypropyltrimethoxysilane) is replaced with a silane coupling agent of the same mass (γ-aminopropyltrimethoxysilane), and other conditions are the same as those in Example 1.

[0105] Example 12

[0106] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and embodiment 1 is that 15 parts of a silane coupling agent (γ-glycidyloxypropyltrimethoxysilane) is added, and other conditions are the same as those in embodiment 1.

[0107] Embodiment 13

[0108] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and embodiment 1 is that 25 parts of a silane coupling agent (γ-glycidyloxypropyltrimethoxysilane) is added, and other conditions are the same as those in embodiment 1.

[0109] Embodiment 14

[0110] This embodiment provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between this embodiment and Embodiment 1 is that the fumed silica (Cabot LM-150) is replaced with fumed silica (Cabot LM-720) of the same mass, and other conditions are the same as those in Embodiment 1.

[0111] Comparative Example 1

[0112] This comparative example provides a one-component silane-modified polyether sealant and a preparation method thereof, which differs from Example 1 only in that the weight fraction of the environmentally friendly plasticizer (polyether polyol C2020) is adjusted to 90 parts, and other conditions are the same as those in Example 1.

[0113] Comparative Example 2

[0114] This comparative example provides a one-component silane-modified polyether sealant and a preparation method thereof, which differs from Example 1 only in that the weight fraction of the environmentally friendly plasticizer (polyether polyol C2020) is adjusted to 140 parts, and other conditions are the same as those in Example 1.

[0115] Comparative Example 3

[0116] This comparative example provides a one-component silane-modified polyether sealant and a preparation method thereof, which differs from Example 1 only in that the weight portion of active nano-calcium carbonate (Guangxi Warner P150) is adjusted to 600 parts, and other conditions are the same as those in Example 1.

[0117] Comparative Example 4

[0118] This comparative example provides a one-component silane-modified polyether sealant and a preparation method thereof, which differs from Example 1 only in that no fumed silica is added, the weight portion of active nano-calcium carbonate (Guangxi Warner P150) is adjusted to 530 parts, and other conditions are the same as Example 1.

[0119] Comparative Example 5

[0120] This comparative example provides a one-component silane-modified polyether sealant and a preparation method thereof. The only difference between the comparative example and Example 1 is that no active nano-calcium carbonate is added, the weight portion of fumed silica (Cabot LM-150) is adjusted to 530 parts, and the other conditions are the same as those in Example 1.

[0121] The one-component silane-modified polyether sealants provided in the above Examples 1 to 14 and Comparative Examples 1 to 5 were tested as follows:

[0122] (1) Surface drying time: Tested in accordance with GB / T 13477.5-2002 "Test methods for building sealing materials Part 5: Determination of surface drying time";

[0123] (2) Curing speed: Tested in accordance with GB / T 32369-2015 "Determination of degree of curing of sealants";

[0124] (3) Viscosity: According to GB / T 2794-1995 "Standard for Determination of Viscosity of Adhesives", the viscosity of the one-component silane-modified polyether sealant was measured using a rotational rheometer;

[0125] (4) Hardness: The one-component silane-modified polyether sealant was cured for 168 h at a temperature of 23°C and a humidity of 50%, and then tested in accordance with GB / T 531.1-1999 “Rubber pocket hardness tester indentation hardness test method”;

[0126] (5) Density: The one-component silane-modified polyether sealant was cured at a temperature of 23°C and a humidity of 50% for 168 h and tested in accordance with GB / T 533-2008 “Determination of density of vulcanized rubber or thermoplastic rubber”;

[0127] (6) Adhesion without primer: According to GB / T 13477.18-2002 "Test methods for building sealing materials Part 18: Determination of peel adhesion", the sealant layer formed by curing the one-component silane-modified polyether sealant and the test substrate are cut and peeled off with a blade. The sealant adheres firmly to the test substrate, the bonding interface does not fall off and the failure is cohesive, which is considered excellent;

[0128] (7) Tensile strength and elongation at break: The one-component silane-modified polyether sealant was cured for 168 h at a temperature of 23°C and a humidity of 50%. The test was conducted using a type 2 dumbbell according to GB / T 528-2009 “Test method for tensile stress-strain properties of vulcanized rubber or thermoplastic rubber”.

[0129] (8) Shear strength: The shear strength of 304 stainless steel and aluminum was tested in accordance with GB / T 7124-2008 “Test method for tensile shear strength of adhesives (rigid material to rigid material)”.

[0130] The test results are shown in Tables 1 and 2 below.

[0131] Table 1

[0132]

[0133] Table 2

[0134]

[0135]

[0136] It can be seen from the contents of Table 1 and Table 2 that the tensile strength of the one-component silane-modified polyether sealant provided by Examples 1-14 is 2.7-3.5 MPa, the shear strength of 304 stainless steel is 3.0-4.2 MPa, the failure type of the shear piece test is ≥90% cohesive failure, the elongation at break is 330%-430%, and the hardness is 50-68 HA. It has relatively excellent bonding performance for stainless steel substrates and aluminum substrates without primer.

[0137] Taking into account the cost of raw materials for the comprehensive product composition, product cost control, production and processing requirements, and mechanical properties of the construction application scenarios, the one-component silane-modified polyether sealant prepared in Example 1 has the best comprehensive performance, with a surface drying time of 15 min, a hardness of up to 64HA, a tensile strength of 3.5 MPa, an elongation at break of 365%, a shear strength of 3.9 MPa for 304 stainless steel substrate, and a viscosity of 254000 mpa·s. The moderate viscosity allows for smooth gluing construction.

[0138] From the comparison among Examples 1, 5 and 6, it can be seen that as the weight fraction of carbon black increases, the tensile strength and shear strength of the prepared one-component silane-modified polyether sealant increase, but the viscosity also increases, and the elongation at break decreases.

[0139] From the comparison among Examples 1, 12 and 13, it can be seen that as the weight fraction of the silane coupling agent increases, the tensile strength and shear strength of the prepared one-component silane-modified polyether sealant increase, but the viscosity also increases, and the elongation at break decreases.

[0140] Compared with Example 1, if the weight fraction of the environmentally friendly plasticizer is too low (Comparative Example 1), the viscosity of the prepared one-component silane-modified polyether sealant is too large, and the glue application is not smooth; if the weight fraction of the environmentally friendly plasticizer is too high (Comparative Example 2), the tensile strength and shear strength of the prepared one-component silane-modified polyether sealant are low.

[0141] Compared with Example 1, if the weight fraction of active nano-calcium carbonate is too high (Comparative Example 4), the viscosity of the prepared single-component silane-modified polyether sealant is too high, and the glue application is not smooth.

[0142] Compared with Example 1, if fumed silica is not added (Comparative Example 5), the shear strength of the prepared one-component silane-modified polyether sealant is lower; if active nano-calcium carbonate is not added (Comparative Example 6), the shear strength of the prepared one-component silane-modified polyether sealant is lower. It can be seen that in the present invention, the one-component silane-modified polyether sealant prepared by compounding active nano-calcium carbonate and fumed silica has better performance.

[0143] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate a one-component silane-modified polyether sealant and its preparation method and application, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A one-component silane-modified polyether sealant, characterized in that: The raw materials for preparing the one-component silane-modified polyether sealant include the following components in parts by weight: 280-300 parts of silane-modified polyether resin, 100-130 parts of environmentally friendly plasticizer, 500-550 parts of nano calcium carbonate, 10-30 parts of fumed silica, 3-5 parts of ultraviolet absorber, 3-5 parts of light stabilizer, 3-5 parts of antioxidant, 15-20 parts of dewatering agent, 15-25 parts of silane coupling agent and 3-5 parts of catalyst.

2. The one-component silane-modified polyether sealant according to claim 1, characterized in that: The silane-modified polyether resin is a dimethoxysilane-terminated polyether resin; Preferably, the viscosity of the silane-modified polyether resin at 25° C. is 10,000 to 80,000 mPa·s.

3. The one-component silane-modified polyether sealant according to claim 1 or 2, characterized in that: The environmentally friendly plasticizer includes any one of polyether polyol, di(2-propylheptyl)phthalate or diisononyl phthalate or a combination of at least two thereof.

4. The one-component silane-modified polyether sealant according to any one of claims 1 to 3, characterized in that: The nano calcium carbonate is active nano calcium carbonate; Preferably, the whiteness of the active nano calcium carbonate is 95% to 99%; Preferably, the specific surface area of ​​the active nano calcium carbonate is 15 to 20 m 2 / g; Preferably, the oil absorption value of the active nano-calcium carbonate is 20 to 30 mL / 100 g; Preferably, the specific surface area of ​​the fumed silica is 150 to 190 m 2 / g.

5. The one-component silane-modified polyether sealant according to any one of claims 1 to 4, characterized in that: The ultraviolet absorber includes any one of 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole or 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole or a combination of at least two thereof; Preferably, the light stabilizer comprises any one of bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly(1-hydroxyethyl-2,2,6,6-tetramethyl-4-hydroxypiperidinyl) succinate or poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6-tetramethyl-piperidinyl)imino]-1,6-hexanediol[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} or a combination of at least two thereof; Preferably, the antioxidant includes any one of glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, diethylene thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] or tris[2,4-di-tert-butylphenyl] phosphite or a combination of at least two thereof.

6. The one-component silane-modified polyether sealant according to any one of claims 1 to 5, characterized in that: The dewatering agent includes vinyl trimethoxy silane and / or vinyl triethoxy silane; Preferably, the silane coupling agent includes any one of γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, oligomeric bisaminosilane, multifunctional aminosilane oligomer, triaminotrimethoxysilane or bis(trimethoxysilylpropyl)amine, or a combination of at least two thereof; Preferably, the catalyst comprises any one or a combination of at least two of dibutyltin bis(acetylacetonate), dibutyltin dilaurate, dibutylbis(2,4-glutarato-O,O')-(OC-6-11)-tin, or a reaction product of tetraethyl silicate and bis(acetyloxy)dibutyltinane; Preferably, the raw materials for preparing the one-component silane-modified polyether sealant further include carbon black; Preferably, the weight proportion of carbon black in the raw materials for preparing the one-component silane-modified polyether sealant is 0 to 20 parts; Preferably, the raw materials for preparing the one-component silane-modified polyether sealant further include a pigment colorant; Preferably, the weight proportion of the pigment colorant in the raw materials for preparing the one-component silane-modified polyether sealant is 10 to 30 parts.

7. A method for preparing a one-component silane-modified polyether sealant according to any one of claims 1 to 6, characterized in that: The one-component silane-modified polyether sealant comprises the following steps: mixing silane-modified polyether resin, environmentally friendly plasticizer, nano calcium carbonate, fumed silica, ultraviolet absorber, light stabilizer, antioxidant, dehydrating agent, silane coupling agent and catalyst to obtain the one-component silane-modified polyether sealant.

8. The preparation method according to claim 7, characterized in that: The one-component silane-modified polyether sealant specifically comprises the following steps: (1) mixing a silane-modified polyether resin, nano-calcium carbonate, optionally carbon black, optionally a pigment colorant, and fumed silica to obtain a first mixture; (2) mixing the first mixture obtained in step (1), an environmentally friendly plasticizer, an ultraviolet absorber, a light stabilizer and an antioxidant to obtain a second mixture; (3) mixing the second mixture obtained in step (2) with a water removing agent to obtain a third mixture; (4) mixing the third mixture obtained in step (3) with a silane coupling agent to obtain a fourth mixture; (5) Mixing the fourth mixture obtained in step (4) with a catalyst to obtain the one-component silane-modified polyether sealant.

9. The preparation method according to claim 8, characterized in that: The mixing in step (1) is carried out under a vacuum degree of -0.09 to 0.1 MPa; Preferably, the mixing temperature in step (1) is 0 to 50°C; Preferably, the mixing in step (1) is stirring mixing, the stirring speed is 900-1000 r / min, and the time is 30-40 min; Preferably, the mixing in step (2) comprises stirring and mixing at 0-50° C. and a rotation speed of 900-1000 r / min for 5-12 min, then heating to 100-120° C., stirring and mixing for 2-3 h under the conditions of a vacuum degree of -0.09-0.1 MPa and a rotation speed of 150-250 r / min; Preferably, the mixing in step (3), step (4) and step (5) is independently carried out under a vacuum degree of -0.09 to 0.1 MPa; Preferably, the mixing temperatures in step (3), step (4) and step (5) are each independently ≤ 45°C; Preferably, the mixing in step (3) is stirring mixing, the stirring mixing speed is 400 to 500 r / min, and the stirring mixing time is 10 to 18 min; Preferably, the mixing in step (4) is stirring mixing, the stirring mixing speed is 400 to 500 r / min, and the stirring mixing time is 10 to 18 min; Preferably, the mixing in step (5) is stirring mixing, the stirring mixing speed is 400-500 r / min, and the stirring mixing time is 5-12 min.

10. Use of the one-component silane-modified polyether sealant according to any one of claims 1 to 6 in bonding and sealing of joints.

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