Silane-terminated polyether resin, its preparation method and application

Abstract

The present invention discloses a silane - terminated polyether resin, its preparation method and applications. The silane - terminated polyether resin has a structure shown in Formula I, wherein R1, R2, R3, R5, R6 and R7 are the same or different, and each independently selected from C1 - C4 alkyl groups and C1 - C4 alkoxy groups, and at least two of R1, R2 and R3 and at least two of R5, R6 and R7 are each independently selected from C1 - C4 alkoxy groups; R4 and R8 are the same or different, and each independently represents absence or a C1 - C6 alkylene group; R9 is selected from hydrogen and C1 - C4 alkyl groups; Ar is an aromatic group; n is 10 - 1000. The silane - terminated polyether resin of the present invention has good mechanical properties and hydrolysis - aging resistance properties.

Description

Technical Field

[0001] The present invention belongs to the field of silane - terminated polyether resins, and particularly relates to silane - terminated polyether resins, their preparation methods and applications. Background Art

[0002] Silane - terminated polyether resins (abbreviated as "MS resins") are a type of polymer with a polyether main chain and methoxy or ethoxy silane end - groups. Due to their excellent structural properties, sealants prepared with MS resins as the base material have excellent weather resistance, adhesiveness, sealing performance, mechanical properties, low staining, and no VOC release. They have gradually replaced silicone adhesives and polyurethane adhesives and become a new type of sealing resin widely used in the construction field. Moreover, the applications of MS resins in the fields of rail transit, logistics and freight, electronics and electricity, etc. are also gradually expanding.

[0003] Currently, most of the common MS resins on the market are polyurethane - type MS resins. The preparation process of polyurethane - type MS resins involves the condensation reaction of isocyanate and hydroxyl groups. However, due to the incomplete condensation reaction, the finally obtained MS resin adhesives often have difficult - to - solve problems such as residual highly toxic isocyanate groups. The addition - type MS resin of Kaneka adopts the strategy of platinum - metal - catalyzed hydrosilylation, and the use of platinum - based heavy metals inevitably causes irreversible pollution to the environment, which is obviously contrary to the concept of green development. Other routes may also involve the exchange chain - extension reaction of organic halides and hydroxyl groups, and this process will generate a large amount of VOC emissions, which makes the tail - gas treatment in the MS resin preparation process an urgent problem to be solved. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide silane - terminated polyether resins, their preparation methods and applications in view of the technical problems existing in the prior art. The silane - terminated polyether resins of the present invention have good mechanical properties and hydrolysis and aging resistance.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] On the one hand, the present invention provides a silane - terminated polyether resin, wherein the silane - terminated polyether resin has the structure shown in Formula I,

[0007]

[0008] Wherein, R1, R2, R3, R5, R6 and R7 are the same or different and are each independently selected from C1-C4 alkyl and C1-C4 alkoxy, and at least two of R1, R2 and R3 and at least two of R5, R6 and R7 are each independently selected from C1-C4 alkoxy; R4 and R8 are the same or different and each independently represents absent or C1-C6 alkylene; R9 is selected from hydrogen and C1-C4 alkyl; Ar is an aromatic group; and n is 10-1000.

[0009] The silane-terminated polyether resin provided by the present invention, wherein the silane-terminated polyether resin has the structure shown in Formula II,

[0010]

[0011] The silane-terminated polyether resin provided by the present invention, wherein in Formula I and Formula II, Ar is an unsubstituted divalent phenyl or a substituted divalent phenyl.

[0012] In some embodiments, the substituted divalent phenyl is a divalent phenyl substituted with halogen, nitro, amino, hydroxyl, vinyl, mercapto or methoxy. Preferably, Ar is selected from benzene-1,4-diyl, 2-chlorobenzene-1,4-diyl, 2-iodobenzene-1,4-diyl, tetrafluorobenzene-1,4-diyl, tetrabromobenzene-1,4-diyl, 2-nitrobenzene-1,4-diyl, 2-aminobenzene-1,4-diyl, 2-hydroxybenzene-1,4-diyl, 2-vinylbenzene-1,4-diyl, 2-mercaptobenzene-1,4-diyl, 2,5-difluorobenzene-1,4-diyl, 2-methoxybenzene-1,4-diyl, benzene-1,2-diyl, 3-chlorobenzene-1,2-diyl, 3-iodobenzene-1,2-diyl, tetrafluorobenzene-1,2-diyl, tetrabromobenzene-1,2-diyl, 3-nitrobenzene-1,2-diyl, 3-aminobenzene-1,2-diyl, 3-hydroxybenzene-1,2-diyl, 3-vinylbenzene-1,2-diyl, 4-mercaptobenzene-1,2-diyl, 3-fluorobenzene-1,2-diyl, 4-fluorobenzene-1,2-diyl and 3-methoxybenzene-1,2-diyl.

[0013] The silane-terminated polyether resin provided by the present invention, wherein in Formula I and Formula II, R9 is selected from hydrogen and methyl.

[0014] The silane-terminated polyether resin provided by the present invention, wherein the C1-C4 alkyl is selected from methyl, ethyl, n-propyl and n-butyl.

[0015] The silane-terminated polyether resin provided by the present invention, wherein the C1-C4 alkoxy is selected from methoxy, ethoxy, n-propoxy and n-butoxy.

[0016] The silane - terminated polyether resin provided by the present invention, wherein the C1 - C6 alkylene group is selected from methylene, ethylene, 1,3 - propylene, 1,4 - butylene, 1,5 - pentylene, 1,6 - hexylene.

[0017] The silane - terminated polyether resin provided by the present invention, wherein n is 20 - 600, preferably 50 - 600, more preferably 100 - 300.

[0018] In a second aspect, the present invention provides a method for preparing the silane - terminated polyether resin of the first aspect, and the preparation method includes the following steps:

[0019] S100: Mix the hydroxyl polyether shown in formula III, the aromatic diacid chain extender shown in formula IV, the Lewis base catalyst and the solvent to obtain a first reaction system. Under the condition of an ice - water bath, dropwise add the first azo promoter and an optional first oxidant to the first reaction system, and carry out the Mitsunobu reaction to obtain a first reaction product;

[0020]

[0021] In formula III, R9 is selected from hydrogen and C1 - C4 alkyl, and n is 10 - 1000; in formula IV, Ar is an aromatic group;

[0022] S200: Dropwise add the silane coupling agent shown in formula V, the second azo promoter and an optional second oxidant to the first reaction product obtained in step S100, and carry out the Mitsunobu reaction under the condition of an ice - water bath to obtain the silane - terminated polyether resin;

[0023]

[0024] In formula V, R1, R2 and R3 are the same or different, and are each independently selected from C1 - C4 alkyl and C1 - C4 alkoxy, and at least two of R1, R2 and R3 are each independently selected from C1 - C4 alkoxy; R4 represents a deletion or a C1 - C6 alkylene group; A is selected from - OH and - NH2.

[0025] According to the preparation method provided by the present invention, wherein the molar ratio of the hydroxyl polyether, the aromatic diacid chain extender and the silane coupling agent is 1:(1.9 - 2.1):(1.9 - 2.1), preferably 1:2:2.

[0026] According to the preparation method provided by the present invention, wherein based on 100 parts by weight of the hydroxyl polyether, the dosage of the Lewis base catalyst is 0.01 - 0.2 parts by weight, preferably 0.02 - 0.03 parts by weight.

[0027] According to the preparation method provided by the present invention, based on 100 parts by weight of the hydroxy polyether, the amount of the first azo accelerator and the second azo accelerator is independently 0.002-0.5 parts by weight, preferably 0.005-0.2 parts by weight, and more preferably 0.01-0.1 parts by weight.

[0028] According to the preparation method provided by the present invention, based on 100 parts by weight of the hydroxy polyether, the amounts of the first oxidant and the second oxidant are independently 0-1 parts by weight, preferably 0-0.5 parts by weight.

[0029] According to the preparation method provided by the present invention, the amount of the solvent is 100-200 parts by weight based on 100 parts by weight of the hydroxy polyether.

[0030] According to the preparation method provided by the present invention, wherein, in formula III, R9 is selected from hydrogen and methyl, and n is 20-600, preferably 50-600, and more preferably 100-300.

[0031] In some embodiments, the number average molecular weight of the hydroxy polyether is 600-25000 g / mol, preferably 10000-20000 g / mol.

[0032] According to the preparation method provided by the present invention, the aromatic diacid chain extender is selected from terephthalic acid, 2-chloroterephthalic acid, 2-iodoterephthalic acid, tetrafluoroterephthalic acid, tetrabromoterephthalic acid, 2-nitroterephthalic acid, 2-aminoterephthalic acid, 2-hydroxyterephthalic acid, 2-vinylterephthalic acid, 2-mercaptoterephthalic acid, 2,5-difluoroterephthalic acid, 2-methoxyterephthalic acid, phthalic acid, 3-chlorophthalic acid, 3-iodophthalic acid, tetrafluorophthalic acid, tetrabromophthalic acid, 3-nitrophthalic acid, 3-aminophthalic acid, 3-hydroxyphthalic acid, 3-vinylphthalic acid, p-mercaptophthalic acid, 3-fluorophthalic acid, 4-fluorophthalic acid and 3-methoxyphthalic acid.

[0033] According to the preparation method provided by the present invention, examples of the Lewis base catalyst include but are not limited to triphenylphosphine, trimethylphosphine, tributylphosphine, tri-tert-butylphosphine, triisopropylphosphine, tri-n-hexylphosphine, tri-n-octylphosphine, tricyclohexylphosphine, tricyclopentylphosphine, dicyclopentylphosphine, diethylphenylphosphine and tri-p-tolylphosphine.

[0034] According to the preparation method provided by the present invention, wherein the first azo promoter and the second azo promoter are the same or different, and are each independently selected from diethyl azodicarboxylate, dimethyl azodicarboxylate, dibenzyl azodicarboxylate, di-morpholino azodicarbonyl, dimethyl 2,2'-azobis(2-methylpropionate), di-tert-butyl azodicarboxylate, diisopropyl azodicarboxylate, 1,1'-(azodicarbonyl)dipiperidine, diethyl 4,4'-azodibenzoate, azodicarbonamide, azodicarbonamide, and 2,2'-azobis(2-methyl-N-(2-hydroxyethyl)propionamide).

[0035] According to the preparation method provided by the present invention, wherein the first oxidant and the second oxidant are the same or different, and are each independently selected from iodobenzenediacetic acid and iodomesitylenebis(acetate).

[0036] According to the preparation method provided by the present invention, wherein the silane coupling agent is selected from hydroxymethyldimethoxysilane, hydroxymethyltrimethoxysilane, hydroxymethyltriethoxysilane, hydroxypropyltrimethoxysilane, and aminopropyltrimethoxysilane.

[0037] According to the preparation method provided by the present invention, wherein the Mitsunobu reaction in step S100 is carried out for 2 - 6 h; and / or, the Mitsunobu reaction in step S200 is carried out for 2 - 6 h.

[0038] According to the preparation method provided by the present invention, wherein step S200 further includes: after the reaction is completed, evacuating at room temperature for 4 - 6 h.

[0039] In the present invention, the same symbols in different structural formulas represent the same (corresponding) groups.

[0040] In the third aspect, the present invention provides the use of the silane - terminated polyether resin of the first aspect or the silane - terminated polyether resin prepared by the preparation method of the second aspect in the field of sealants.

[0041] The present invention has the following advantages:

[0042] (1) The silane - terminated polyether resin of the present invention has good mechanical properties and hydrolysis - resistant aging properties. In particular, it is believed that the present invention uses aromatic diacid chain extenders to introduce an aromatic ring structure into the silane - terminated polyether resin, thereby significantly improving the hydrolysis - resistant aging properties and having improved weather resistance and aging resistance. In addition, the structure of the silane - terminated polyether resin of the present invention can be adjusted, and it is an MS resin with adjustable mechanical properties, adjustable curing time, and excellent hydrolysis - resistant aging properties.

[0043] (2) The preparation method of the present invention adopts Mitsunobu reaction for stepwise esterification, avoiding the use of isocyanate, heavy metal catalyst and organic halide chain extender, and meets the requirements of low carbon and environmental protection. The reaction in the preparation method of the present invention can be carried out at a temperature below room temperature, avoiding the hydrolysis of alkoxysilane (for example, hydroxyl-containing silane coupling agent) that may occur in the esterification process (or amidation process), and the preparation process does not require strict water removal or high vacuum and ultra-high temperature, which greatly saves production costs and is easy to operate. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0045] Some of the raw materials used in the following examples and comparative examples are as follows:

[0046] DOP plasticizer: dioctyl phthalate, Blue Sail Chemical Group;

[0047] Organic tin: dibutyltin diacetate, Xindian Chemical Materials (Shanghai) Co., Ltd.;

[0048] Water absorbent: vinyl trimethoxysilane, Hangzhou Guibao Chemical Co., Ltd.;

[0049] Calcium carbonate: CCS-25, Guangxi Huana New Materials Co., Ltd.

[0050] The raw materials not given are all commonly used materials in the art and can be obtained from commercial sources or prepared in-house.

[0051] Example 1

[0052] (1) 100 parts by weight of polypropyl ether (Mn=12000 g / mol), 2.77 parts by weight of terephthalic acid, 0.025 parts by weight of triphenylphosphine and 150 parts by weight of tetrahydrofuran were uniformly mixed, 0.1 parts by weight of diethyl azodicarboxylate was dropped into the system, and the mixture was reacted in an ice-water bath for 4 hours to obtain a first reaction product.

[0053] (2) 3.01 parts by weight of hydroxypropyltrimethoxysilane was added to the first reaction product, and 0.1 parts by weight of dimethyl azodicarboxylate was continuously added dropwise, and the reaction was continued for 4 hours in an ice-water bath, and then vacuumed for 6 hours by connecting to a drying tube to obtain a silane-terminated polyether resin.

[0054] Example 2

[0055] (1) 100 parts by weight of polypropylene ether (Mn = 12,000 g / mol), 2.77 parts by weight of terephthalic acid, 0.025 parts by weight of triphenylphosphine, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.01 parts by weight of diethyl azodicarboxylate and 0.5 parts by weight of iodobenzenediacetic acid were added dropwise into the system, and the reaction was carried out for 2 h in an ice-water bath to obtain the first reaction product.

[0056] (2) 3.01 parts by weight of hydroxypropyltrimethoxysilane were added to the first reaction product, and 0.01 parts by weight of dimethyl azodicarboxylate and 0.5 parts of iodobenzenediacetic acid were continuously added dropwise. The reaction was continued for 3 h in an ice-water bath, and then a drying tube was connected and the vacuum was pumped for 6 h to obtain the MS resin.

[0057] Example 3

[0058] (1) 100 parts by weight of polypropylene ether (Mn = 12,000 g / mol), 3.97 parts by weight of tetrafluoroterephthalic acid, 0.025 parts by weight of triphenylphosphine, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 parts by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath to obtain the first reaction product.

[0059] (2) 3.01 parts by weight of hydroxypropyltrimethoxysilane were added to the first reaction product, and 0.1 parts by weight of dimethyl azodicarboxylate was continuously added dropwise. The reaction was continued for 5 h in an ice-water bath, and then a drying tube was connected and the vacuum was pumped for 6 h to obtain the MS resin.

[0060] Example 4

[0061] (1) 100 parts by weight of polypropylene ether (Mn = 12,000 g / mol), 2.77 parts by weight of terephthalic acid, 0.025 parts by weight of triphenylphosphine, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 parts by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath to obtain the first reaction product.

[0062] (2) 2.03 parts by weight of hydroxymethyldimethoxysilane were added to the first reaction product, and 0.1 parts by weight of dimethyl azodicarboxylate was continuously added dropwise. The reaction was continued for 4 h in an ice-water bath, and then a drying tube was connected and the vacuum was pumped for 6 h to obtain the MS resin.

[0063] Example 5

[0064] (1) 100 parts by weight of polypropylene ether (Mn = 12,000 g / mol), 2.77 parts by weight of terephthalic acid, 0.025 parts by weight of triphenylphosphine, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 parts by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath to obtain the first reaction product.

[0065] (2) 3.01 parts by weight of aminopropyltrimethoxysilane was added to the first reaction product, and 0.1 part by weight of dimethyl azodicarboxylate was continuously added dropwise. The reaction was continued for 3 h in an ice-water bath, and then a drying tube was connected and evacuated for 6 h to obtain the MS resin.

[0066] Example 6

[0067] (1) 125 parts by weight of polyether (Mn = 15000 g / mol), 2.77 parts by weight of terephthalic acid, 0.025 part by weight of triphenylphosphine, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 part by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath to obtain the first reaction product.

[0068] (2) 3.01 parts by weight of hydroxypropyltrimethoxysilane was added to the first reaction product, and 0.1 part by weight of dimethyl azodicarboxylate was continuously added dropwise. The reaction was continued for 4 h in an ice-water bath, and then a drying tube was connected and evacuated for 6 h to obtain the silane-terminated polyether resin.

[0069] Example 7

[0070] (1) 100 parts by weight of polypropylene ether (Mn = 12000 g / mol), 2.77 parts by weight of phthalic acid, 0.025 part by weight of triphenylphosphine, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 part by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath to obtain the first reaction product.

[0071] (2) 3.01 parts by weight of hydroxypropyltrimethoxysilane was added to the first reaction product, and 0.1 part by weight of dimethyl azodicarboxylate was continuously added dropwise. The reaction was continued for 4 h in an ice-water bath, and then a drying tube was connected and evacuated for 6 h to obtain the silane-terminated polyether resin.

[0072] Comparative Example 1

[0073] 100 parts by weight of polypropylene ether (Mn = 12000 g / mol), 0.025 part by weight of triphenylphosphine, 3.01 parts by weight of hydroxypropyltrimethoxysilane, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 part by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath, and then a drying tube was connected and evacuated for 6 h to obtain the silane-terminated polyether resin.

[0074] Comparative Example 2

[0075] 100 parts by weight of polypropylene ether (Mn = 12000 g / mol), 0.025 part by weight of triphenylphosphine, 2.03 parts by weight of hydroxymethyldimethoxysilane, and 150 parts by weight of tetrahydrofuran were mixed evenly. 0.1 part by weight of diethyl azodicarboxylate was added dropwise into the system, and the reaction was carried out for 4 h in an ice-water bath, and then a drying tube was connected and evacuated for 6 h to obtain the silane-terminated polyether resin.

[0076] Performance characterization

[0077] 1. Use a rotational viscometer to measure the viscosities of polypropylene ether and the silane - terminated polyether resins prepared in each example and comparative example at a measurement temperature of 23°C, and observe their colors. The results are shown in Table 1.

[0078] Table 1 Viscosity and appearance of MS resin

[0079] Viscosity (cp) Color Example 1 15780 White Example 2 15800 White Example 3 17020 White Example 4 12710 White Example 5 16280 Light yellow Example 6 14670 White Example 7 16040 White Comparative Example 1 12650 White Comparative Example 2 14320 White

[0080] 2. Mechanical properties

[0081] Mix the prepared MS resin according to the weight - part ratio of base material: calcium carbonate powder: DOP plasticizer: organotin: KH550: water absorbent = 3:3:2:0.05:0.075:0.075, and fill and cure it at room temperature. The depth of the mold is 1 mm, and cure for 24 h to obtain test samples.

[0082] Use a Shore hardness tester to test the hardness, and perform mechanical property tests using a universal electronic tensile testing machine according to the JC / T881—2001 standard. The results are shown in Table 2.

[0083] Immersion experiment: Test according to the test method in Appendix A of the JC / T881—2001 "Sealant for Concrete Building Joints" standard. Place the samples in pure water, sodium hydroxide solution with a pH value of 11, and hydrochloric acid solution with a pH value of 3 respectively. After soaking for 7 days, re - detect the tensile strength of the samples. The results are shown in Table 2.

[0084] Table 2 Mechanical property test of MS resin

[0085]

[0086] It can be seen from Table 2 that the silane - terminated polyether resin of the present invention has good mechanical properties and hydrolysis and aging resistance.

Claims

1. Silane - terminated polyether resin, characterized in that, The silane-capped polyether resin has the structure shown in Formula I, Formula I wherein R1, R2, R3, R5, R6 and R7 are the same or different and are each independently selected from C1-C4 alkyl groups and C1-C4 alkoxy groups, and at least two of R1, R2 and R3 and at least two of R5, R6 and R7 are each independently selected from C1-C4 alkoxy groups; R4 and R8 are the same or different and each independently represents absence or a C1-C6 alkylene group; R9 is selected from hydrogen and C1-C4 alkyl groups; Ar is an aromatic group; n is from 10 to 1000; Ar is selected from tetrafluorobenzene-1,4-diyl, 2,5-difluorobenzene-1,4-diyl, tetrafluorobenzene-1,2-diyl, 3-fluorobenzene-1,2-diyl and 4-fluorobenzene-1,2-diyl.

2. The silane-capped polyether resin according to claim 1, characterized in that, The silane-capped polyether resin has the structure shown in Formula II, Formula II.

3. The silane-capped polyether resin according to claim 1, wherein, R9 is selected from hydrogen and methyl.

4. The silane-capped polyether resin according to any one of claims 1-3, characterized in that, The C1-C4 alkyl group is selected from methyl, ethyl, n-propyl and n-butyl; and / or, the C1-C4 alkoxy group is selected from methoxy, ethoxy, n-propoxy and n-butoxy; and / or, the C1-C6 alkylene group is selected from methylene, ethylene, 1,3-propylene, 1,4-butylene, 1,5-pentylene, 1,6-hexylene; and / or, n is from 20 to 600.

5. The silane - terminated polyether resin according to claim 4, characterized in that, n is from 100 to 300.

6. The preparation method of the silane-capped polyether resin according to any one of claims 1-5, characterized in that, The preparation method comprises the following steps: S100. Mix a hydroxyl polyether shown in Formula III, an aromatic diacid chain extender, a Lewis base catalyst and a solvent to obtain a first reaction system. Under ice-water bath conditions, dropwise add a first azo promoter and an optional first oxidizing agent to the first reaction system, and carry out Mitsunobu reaction to obtain a first reaction product; Formula III In Formula III, R9 is selected from hydrogen and C1-C4 alkyl groups, and n is from 10 to 1000; the aromatic diacid chain extender is selected from tetrafluoroterephthalic acid, 2,5-difluoroterephthalic acid, tetrafluorophthalic acid, 3-fluorophthalic acid or 4-fluorophthalic acid; S200. Dropwise add a silane coupling agent shown in Formula V, a second azo promoter and an optional second oxidizing agent to the first reaction product obtained in step S100, and carry out Mitsunobu reaction under ice-water bath conditions to obtain a silane-capped polyether resin; Formula V In Formula V, R1, R2 and R3 are the same or different and are each independently selected from C1-C4 alkyl groups and C1-C4 alkoxy groups, and at least two of R1, R2 and R3 are each independently selected from C1-C4 alkoxy groups; R4 represents absence or a C1-C6 alkylene group; A is selected from -OH and -NH2.

7. The preparation method according to claim 6, characterized in that The molar ratio of the hydroxyl polyether, the aromatic diacid chain extender and the silane coupling agent is 1:(1.9-2.1):(1.9-2.1); and / or, based on 100 parts by weight of the hydroxyl polyether, the amount of the Lewis base catalyst used is 0.01-0.2 parts by weight; and / or, based on 100 parts by weight of the hydroxyl polyether, the amounts of the first azo promoter and the second azo promoter used are each independently 0.002-0.5 parts by weight; and / or, based on 100 parts by weight of the hydroxy polyether, the amounts of the first oxidant and the second oxidant are independently 0-1 parts by weight; And / or, based on 100 parts by weight of the hydroxy polyether, the amount of the solvent is 100-200 parts by weight.

8. The preparation method according to claim 6 or 7, characterized in that, In formula III, R9 is selected from hydrogen and methyl, and n is 20-600; and / or, the Lewis base catalyst is selected from triphenylphosphine, trimethylphosphine, tributylphosphine, tri-tert-butylphosphine, triisopropylphosphine, tri-n-hexylphosphine, tri-n-octylphosphine, tricyclohexylphosphine, tricyclopentylphosphine, dicyclopentylphosphine, diethylphenylphosphine and tri-p-tolylphosphine; and / or, the first azo accelerator and the second azo accelerator are the same or different, and are independently selected from diethyl azodicarboxylate, dimethyl azodicarboxylate, dibenzyl azodicarboxylate, azodicarbonyl dimorpholine, dimethyl azodiisobutyrate, di-tert-butyl azodicarboxylate, diisopropyl azodicarboxylate, 1,1'-(azodicarbonyl)dipiperidine, diethyl 4,4'-azodibenzoate, azodicarbonamide, azodicarbonamide and 2,2'-azo(2-methyl-N-(2-hydroxyethyl)propionamide); and / or, the first oxidant and the second oxidant are the same or different, and are independently selected from iodophenyl diacetic acid and iodo-mesitylene diacetate; and / or, the solvent is selected from tetrahydrofuran, dichloromethane and N,N-dimethylformamide; And / or, the silane coupling agent is selected from hydroxymethyldimethoxysilane, hydroxytrimethoxysilane, hydroxytriethoxysilane, hydroxypropyltrimethoxysilane and aminopropyltrimethoxysilane.

9. The preparation method according to claim 8, characterized in that, n is 100-300.

10. The preparation method according to claim 6 or 7, characterized in that, The Mitsunobu reaction in step S100 is carried out for 2-6 hours; And / or, the Mitsunobu reaction in step S200 is performed for 2-6 hours.

11. The preparation method according to claim 6 or 7, characterized in that, Step S200 also includes: after the reaction is completed, vacuumizing the room temperature for 4-6 hours.

12. Use of the silane-terminated polyether resin according to any one of claims 1 to 5 or the silane-terminated polyether resin prepared by the preparation method according to any one of claims 6 to 11 in the field of sealants.

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