Silane-modified polyether waterproof coating, its preparation method and use of modified epoxy resin

Abstract

The present application discloses a silane-modified polyether waterproof coating, its preparation method, and the use of a modified epoxy resin. The coating, by weight, comprises: 100 parts of a Wacker alkoxy-terminated polyether; 86 to 120 parts of a Zhonghua alkoxy-terminated polyether; 18 to 32 parts of a special polyether polyol; 2 to 5 parts of an isocyanate group-containing siloxane; 5 to 8 parts of a diisocyanate; 180 to 250 parts of an active plasticizer; 340 to 650 parts of a pigment and filler; 5 to 13 parts of a modified epoxy resin containing terminal epoxy groups, alkoxysilyl groups, and an epoxyalkyl acrylate monomer-derived chain segment; 4 to 16 parts of a latent curing agent; 4 to 10 parts of a water remover; 1 to 3 parts of an accelerator; 0.6 to 2.3 parts of a catalyst. The hydrolysis of the alkoxysilyl groups in the coating crosslinks with the alkoxy-terminated polyether and the hydroxyl groups on the substrate to enhance the adhesion, and the modified epoxy resin, the isocyanate group-containing siloxane, and the special polyether polyol improve the anti-peeling performance of the coating on the coil. The epoxy groups of the active plasticizer crosslink with the hydrolyzed latent curing agent to prevent the migration of the plasticizer.

Description

Technical Field

[0001] This application belongs to the technical field of coatings, and in particular relates to a silane-modified polyether waterproof coating, its preparation method, and the use of modified epoxy resin. Background Art

[0002] Silane-modified polyether waterproof coating is a one-component, solvent-free waterproof coating prepared based on modified polyether resin, with functional additives, fillers, and catalysts. It has the advantages of high elongation, high tensile strength, good low-temperature flexibility, and low water absorption. Silane polyether resin, also known as end-silane-modified polyether resin or organosilicon-modified polyether resin, initially mainly appeared in the form of end-silyl polyether sealants. Silyl polyether sealants, also known as MS sealants, organosilicon-modified polyether sealants, and modified silicone sealants, are applied to the substrate during use and cured by reacting with moisture to form a continuous and seamless polymer elastic waterproof film. Silane-modified polyether waterproof coating can be used for roofing, exterior walls, etc. under the condition of applying an appropriate protective layer. This coating can be constructed to the designed thickness in one pass by scraping, rolling, brushing, spraying, etc., saving time and construction costs.

[0003] In the field of building waterproofing, silane-modified polyether waterproof coating can be used to form a secondary waterproof layer in the cold operation construction of some waterproof membranes. A good bonding interface can be formed between the silane-modified polyether waterproof coating and the waterproof membrane, showing excellent bonding performance. The formed coating-membrane adhesive layer has excellent bonding and adhesion performance, and the adhesive layer has the characteristics of being tightly impermeable, excellent performance, overall excellent waterproof effect, and long service life, and has been promoted as a new type of waterproof coating. However, the inventors of this application found that during the use of silane-modified polyether waterproof coating, the traditional silane-modified polyether waterproof coating can cause compatibility problems with waterproof membranes due to the migration of plasticizers. The migration of plasticizers can cause a swelling effect on waterproof membranes, especially those composed of components such as asphalt and butyl rubber, and reduce the cohesion and adhesive peel performance of the membrane components to varying degrees. At the same time, the traditional silane-modified polyether waterproof coating has an unsatisfactory bonding to the cement base surface, with low bonding performance, and also has certain requirements for the dryness of the base surface. On a concrete base surface with standing water, the coating has poor wettability, is not easy to apply, and the bonding strength decreases significantly, resulting in poor bonding effect and unable to meet the construction progress requirements and waterproof requirements. Therefore, how to prepare a silane-modified polyether waterproof coating with excellent bonding, no compatibility problems such as plasticizer migration with waterproof membranes, and can be directly constructed on a wet base surface has become an urgent problem to be solved at present. Summary of the Invention

[0004] The embodiments of the present application provide a silane-modified polyether waterproof coating and a preparation method thereof. The prepared silane-modified polyether waterproof coating can wet the concrete base surface, directly construct on the wet concrete base surface, improve the adhesion performance and anti-peeling performance with the waterproof coiled material, and prevent the migration of plasticizers.

[0005] In a first aspect, the present application provides a silane-modified polyether waterproof coating, which includes the following components in parts by weight: Wacker alkoxy-terminated polyether, 100 parts by weight; Zhonghua alkoxy-terminated polyether, 86-120 parts by weight; special polyether polyol, 18-32 parts by weight; isocyanate group siloxane, 2-5 parts by weight; diisocyanate, 5-8 parts by weight; active plasticizer, 180-250 parts by weight; pigment and filler, 340-650 parts by weight; modified epoxy resin, 5-13 parts by weight; the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; latent curing agent, 4-16 parts by weight; water remover, 4-10 parts by weight; accelerator, 1-3 parts by weight; catalyst, 0.6-2.3 parts by weight.

[0006] According to the embodiments of the first aspect of the present application, the epoxy equivalent of the modified epoxy resin is 260 g / mol to 430 g / mol.

[0007] According to the embodiments of the first aspect of the present application, the Wacker alkoxy-terminated polyether is selected from STP-E35, STP-E30, STP-E15 and STP-E10 or a combination thereof.

[0008] According to the embodiments of the first aspect of the present application, the Zhonghua alkoxy-terminated polyether is selected from SAX227, SAX327, SAX220 and SAX750 or a combination thereof.

[0009] According to the embodiments of the first aspect of the present application, the special polyether polyol is selected from water-soluble polyethers NJ-480S, NJ-2442 or a combination thereof.

[0010] According to the embodiments of the first aspect of the present application, the isocyanate group siloxane is selected from γ-isocyanate group propyltrimethoxysilane, γ-isocyanate group propyltriethoxysilane, isocyanate methyltrimethoxysilane or a combination thereof.

[0011] According to the embodiments of the first aspect of the present application, the diisocyanate is selected from aromatic diisocyanates and aliphatic diisocyanates or a combination thereof.

[0012] According to an embodiment of the first aspect of the present application, the diisocyanate is selected from toluene diisocyanate, diphenylmethane-4,4'-diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, or a combination thereof.

[0013] According to an embodiment of the first aspect of the present application, the active plasticizer is selected from epoxy soybean oil, epoxy linseed oil, epoxy cottonseed oil, epoxy rice bran oil, epoxy sunflower oil, or a combination thereof.

[0014] According to an embodiment of the first aspect of the present application, the pigment and filler are selected from fumed silica, nano calcium carbonate, heavy calcium carbonate, modified heavy calcium carbonate, nano kaolin, carbon black, modified kaolin, or a combination thereof.

[0015] According to an embodiment of the first aspect of the present application, the modified epoxy resin includes the structure shown in formula (1):

[0016]

[0017] In formula (1), n is an integer from 1 to 25, and X is an integer from 1 to 3; R1 is a straight-chain alkylene or branched-chain alkylene with no less than 2 carbon atoms, R2 is an alkyl group of C1-C3, R3 is a straight-chain or branched-chain alkyl group of C1-C3, and m1 + m2 = 3; R4 includes a group with the following structural formula:

[0018]

[0019] In formula (2), X is an integer from 1 to 3, R5 is H, R6 is an epoxy alkyl group of C3 or C7, and R7 is H or methyl, represents the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0020] According to an embodiment of the first aspect of the present application, in formula (1), n is an integer from 1 to 2; R1 is propylene, R2 is methyl, and R3 is methyl or ethyl.

[0021] According to an embodiment of the first aspect of the present application, in formula (2), R4 is a structure shown in any one of formula (2-a) to formula (2-d):

[0022]

[0023] In formula (2-a) to formula (2-d), X is an integer from 1 to 3, and R5 is H in all cases, represents the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0024] According to an embodiment of the first aspect of the present application, the modified epoxy resin is prepared through the following steps:

[0025] Bisphenol A epoxy resin and ureido silane coupling agent are mixed and reacted to prepare reactant A; the structural reaction formula (3) for the reaction of bisphenol A epoxy resin and ureido silane coupling agent to prepare modified epoxy resin is as follows:

[0026]

[0027]

[0028] In reaction formula (3), n is an integer from 1 to 25, R1 is a straight-chain or branched-chain alkylene group with at least 2 carbon atoms, R2 is an alkyl group with C1-C3, R3 is a straight-chain or branched-chain alkyl group with C1-C3, and m1 + m2 = 3;

[0029] Under the protection of inert gas, an acrylic epoxy alkyl ester monomer and an initiator are added to reactant A to prepare modified epoxy resin; the reaction formula (4) for the reaction of reactant A and acrylic epoxy alkyl ester monomer to prepare modified epoxy resin is as follows:

[0030]

[0031] In reaction formula (4), n is an integer from 1 to 25, R1 is a straight-chain or branched-chain alkylene group with at least 2 carbon atoms, R2 is an alkyl group with C1-C3, R3 is a straight-chain or branched-chain alkyl group with C1-C3, and m1 + m2 = 3; R6 is an epoxy alkyl group with C3 or C7, R7 is H or methyl, and R4 includes groups with the following structural formula:

[0032]

[0033] In formula (2), X is an integer from 1 to 3, R5 is H, R6 is an epoxy alkyl group with C3 or C7, R7 is H or methyl, represents the position where R4 is connected to the molecular chain skeleton of the modified epoxy resin.

[0034] According to the embodiments of the first aspect of the present application, the bisphenol A epoxy resin is selected from bisphenol A epoxy resin E44, bisphenol A epoxy resin E51, bisphenol A epoxy resin 128, or a combination thereof.

[0035] According to the embodiments of the first aspect of the present application, the ureido silane coupling agent is selected from γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane, 3-(diisopropylureidopropyl)triethoxysilane, or a combination thereof.

[0036] According to the embodiments of the first aspect of the present application, the initiator is selected from benzoyl peroxide, dibenzoyl peroxide, tert-butyl peroxybenzoate, tert-amyl peroxy-2-ethylhexanoate, 1,1-bis(tert-amylperoxy)cyclohexane, or a combination thereof.

[0037] According to an embodiment of the first aspect of the present application, bisphenol A epoxy resin, ureido silane coupling agent, and acrylic epoxy alkyl ester monomers are added respectively in a molar ratio of 1:(1 to 1.05):(1 to 3).

[0038] According to an embodiment of the first aspect of the present application, the acrylic epoxy alkyl ester monomers are selected from 2,3-epoxypropyl acrylate, glycidyl methacrylate, 3,4-epoxycyclohexylmethyl methacrylate, 3,4-epoxycyclohexyl acrylate, or a combination thereof.

[0039] According to an embodiment of the first aspect of the present application, the latent curing agent is selected from aldehyde imines, ketone imines, oxazolidines, or a combination thereof.

[0040] According to an embodiment of the first aspect of the present application, the latent curing agent is selected from XY-401, YRLH-1106, JW505, or a combination thereof.

[0041] According to an embodiment of the first aspect of the present application, the water scavenger is selected from vinyltrimethoxysilane, vinyltriacetoxysilane, vinyltriethoxysilane, or a combination thereof.

[0042] According to an embodiment of the first aspect of the present application, the promoter is selected from triacetoxyethylsilane, vinyltriacetoxysilane, diethyldiacetoxysilane, or a combination thereof.

[0043] According to an embodiment of the first aspect of the present application, the catalyst is selected from dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, chelated tin catalysts, or a combination thereof.

[0044] According to an embodiment of the first aspect of the present application, the chelated tin catalysts are selected from U-220H, WCAT-NS01, SG-U303, or a combination thereof.

[0045] In a second aspect, the present application provides a method for preparing a silane-modified polyether waterproof coating, including: dispersing and treating the Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, active plasticizer, pigment and filler to obtain a second dispersion slurry; heating the second dispersion slurry to 100°C to 110°C and performing dehydration treatment under vacuum to obtain a dehydrated product; cooling the dehydrated product to 85°C to 90°C, adding isocyanate group siloxane and diisocyanate, and reacting under inert gas protection to obtain a first reaction product; cooling the first reaction product to 60°C to 70°C, adding the above-mentioned modified epoxy resin and latent curing agent, and performing vacuum dispersion treatment to obtain a first modified product; cooling the first modified product to 50°C to 60°C, adding a water scavenger and a promoter, and performing vacuum dispersion treatment to obtain a second modified product; adding a catalyst to the second modified product and performing vacuum dispersion treatment to obtain the silane-modified polyether waterproof coating.

[0046] According to the embodiments of the second aspect of the present application, the dispersion treatment of Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, active plasticizer, pigments and fillers includes: dispersing Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, and active plasticizer to obtain a first dispersion slurry; heating the first dispersion slurry to 90°C to 100°C and adding pigments and fillers for dispersion treatment to obtain a second dispersion slurry.

[0047] According to the embodiments of the second aspect of the present application, the preparation method of the silane-modified polyether waterproof coating further includes: cooling the silane-modified polyether waterproof coating to ≤50°C and filling it with nitrogen for protection.

[0048] In a third aspect, an embodiment of the present application provides a use of a modified epoxy resin for preparing a silane-modified polyether waterproof coating, and the modified epoxy resin contains a terminal epoxy group, an alkoxysilyl group, and an epoxyalkyl acrylate monomer-derived segment.

[0049] The silane-modified polyether waterproof coating and its preparation method according to the embodiments of the present application can improve the adhesion and peeling properties of the coating to asphalt waterproof rolls, and improve the affinity and wettability of the coating to the concrete base surface, especially to the wet concrete base surface, through a modified epoxy resin with a special structural molecule containing a terminal epoxy group, an alkoxysilyl group, and an epoxyalkyl acrylate, a silicone-oxygen-alkyl-terminated prepolymer formed by the reaction of a special polyether polyol, a diisocyanate, and an isocyanate group-containing siloxane. The alkoxysilyl groups contained in the molecular structure of the modified epoxy resin and the prepolymer hydrolyze and undergo a condensation cross-linking reaction with other siloxanes, and at the same time, the adhesion is improved by the reaction of the alkoxysilyl groups with the hydroxyl groups on the concrete base surface. The introduction of the modified epoxy resin and the isocyanate group-containing siloxane improves the adhesion, water resistance, heat resistance, and weather resistance of the coating film. The terminal epoxy group in the molecular structure of the modified epoxy resin and the epoxy group in the active plasticizer further undergo a cross-linking reaction with the hydrolyzed latent curing agent, giving full play to the excellent adhesion characteristics of epoxy resin. After curing, there are no free plasticizer molecules, preventing plasticizer migration. Detailed Embodiments

[0050] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0051] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0052] To solve the problems of the prior art, an embodiment of the present application provides a silane-modified polyether waterproof coating, its preparation method and the use of a modified epoxy resin. First, the silane-modified polyether waterproof coating provided by the embodiment of the present application will be introduced below.

[0053] In a first aspect, the present application provides a silane-modified polyether waterproof coating, comprising the following components by weight parts: Wacker alkoxy-terminated polyether, 100 weight parts; Zhonghua alkoxy-terminated polyether, 86 - 120 weight parts; special polyether polyol, 18 - 32 weight parts; isocyanate group siloxane, 2 - 5 weight parts; diisocyanate, 5 - 8 weight parts; active plasticizer, 180 - 250 weight parts; pigment filler, 340 - 650 weight parts; modified epoxy resin, 5 - 13 weight parts, the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; latent curing agent, 4 - 16 weight parts; water scavenger, 4 - 10 weight parts; accelerator, 1 - 3 weight parts; catalyst, 0.6 - 2.3 weight parts.

[0054] The silane-modified polyether waterproof coating of the embodiment of the present application uses a modified epoxy resin with a special structural molecule containing a terminal epoxy group, an alkoxysilyl group, and an epoxyalkyl acrylate monomer-derived segment. A special polyether polyol, a diisocyanate, and an isocyanatosiloxane react to form a prepolymer capped with a siloxane, which can improve the adhesion and peel properties of the coating to asphalt waterproof rolls, and improve the affinity and wettability of the coating with a concrete base surface, especially with a wet concrete base surface. The alkoxysilyl groups contained in the molecular structure of the modified epoxy resin and in the prepolymer hydrolyze and undergo a condensation crosslinking reaction with other siloxanes, and at the same time, the hydroxyl groups after the hydrolysis of the alkoxysilyl groups react with the hydroxyl groups on the concrete base surface to enhance the adhesion. The introduction of the modified epoxy resin and isocyanatosiloxane improves the adhesion, water resistance, heat resistance, and weather resistance of the coating film. The epoxy groups in the molecular structure of the modified epoxy resin and the epoxy groups in the reactive plasticizer further undergo a crosslinking reaction with the latent curing agent after hydrolysis, giving full play to the excellent adhesion characteristics of the epoxy resin. After curing, there are no free plasticizer molecules, preventing the migration of the plasticizer, and thus preventing compatibility problems from occurring in the asphalt waterproof roll.

[0055] In the embodiment of the present application, the molecular chain backbone of the modified epoxy resin has a terminal epoxy group, an alkoxysilyl group, and an epoxyalkyl acrylate monomer-derived segment. In each mole of the modified epoxy resin, since the content of the ureido silane coupling agent is equal to or slightly greater than the content of bisphenol A epoxy resin, the corresponding content of the alkoxysilyl group is equal to or slightly greater than the content of the modified epoxy resin, and it contains at least 1 mol to 3 mol of siloxanyl groups, that is, the substituents in the alkoxysilyl group can be 1 or 2 or 3 siloxanyl groups. Exemplarily, the content of siloxanyl groups in each mole of the modified epoxy resin can be 1.1 mol, 1.2 mol, 1.3 mol, 1.45 mol, 1.5 mol, 1.55 mol, 1.7 mol, 1.8 mol, 1.84 mol, 1.9 mol, 2.0 mol, 2.1 mol, 2.3 mol, 2.5 mol, 2.6 mol, 2.75 mol, 2.8 mol, 2.95 mol.

[0056] In some embodiments of the present application, the epoxy equivalent weight of the modified epoxy resin is from 260 g / mol to 430 g / mol. The modified epoxy resin of the present application has a suitable range of epoxy equivalent weight. In particular, the modified epoxy resin within the above range not only has high activity, fast crosslinking speed, and high crosslinking density, which can improve the peel strength and adhesion performance of the waterproof coiled material, but also can further take into account the heat resistance and mechanical strength of the coating, such as tensile strength, tear strength, etc. Exemplarily, the epoxy equivalent weight of the modified epoxy resin is 264 g / mol, 274 g / mol, 284 g / mol, 290 g / mol, 296 g / mol, 300 g / mol, 318 g / mol, 407 g / mol, 412 g / mol, 420 g / mol, 426 g / mol, 430 g / mol.

[0057] In some embodiments of the present application, the Wacker alkoxy-terminated polyether is selected from STP-E35, STP-E30, STP-E15, and STP-E10 or a combination thereof.

[0058] In some embodiments of the present application, the Kaneka alkoxy-terminated polyether is selected from SAX227, SAX327, SAX220, and SAX750 or a combination thereof.

[0059] In the embodiments of the present application, the Wacker alkoxy-terminated polyether and the Kaneka alkoxy-terminated polyether have the meanings well-known in the art. The Wacker alkoxy-terminated polyether can represent an alkoxy-terminated polyether produced by the Wacker Group or an alkoxy-terminated polyether produced according to the production process of Wacker. The Kaneka alkoxy-terminated polyether can represent an alkoxy-terminated polyether produced by Kaneka Corporation (Kaneka, Kaneka) of Japan or an alkoxy-terminated polyether produced according to the production process of Kaneka. The Kaneka alkoxy-terminated polyether is usually prepared by grafting a silane compound containing a hydrolyzable siloxane group to both ends of a difunctional polyether through a specific chemical reaction.

[0060] In some embodiments of the present application, the special polyether polyol is selected from the water-soluble polyethers NJ-480S, NJ-2442 or a combination thereof.

[0061] In the embodiments of the present application, the functionality of the alcohol hydroxyl groups in the special polyether polyol is 3, and its function is to enhance the affinity of the coating system for the concrete base surface, especially for the wet concrete base surface, thereby enhancing the adhesion performance of the coating. The special polyether polyol is obtained by introducing hydrophilic groups into the molecular structure of the conventional polyether polyol, so that the whole molecular structure has the following characteristics: First, it has good water solubility or hydrophilicity, and has good wetting performance for the wet concrete base surface, which helps to enhance the adhesion performance of the coating to the polar base surface; Second, it has high reactivity. Since the special polyether polyol molecule also contains multiple active groups (such as alcohol hydroxyl groups), it is very easy to react with other molecules (such as diisocyanate, isocyanate group siloxane, modified epoxy resin) to form a polymer with a network structure, thereby enhancing the mechanical properties of the coating.

[0062] In some embodiments, the isocyanate group siloxane is selected from γ-isocyanate group propyltrimethoxysilane, γ-isocyanate group propyltriethoxysilane, isocyanatemethyltrimethoxysilane or a combination thereof.

[0063] In the embodiments of the present application, the isocyanate group siloxane is used as a capping agent. First, the special polyether polyol reacts with diisocyanate to form a hydroxyl-terminated prepolymer, and then the hydroxyl-terminated prepolymer reacts with the isocyanate group siloxane to form a siloxane-terminated prepolymer.

[0064] In some embodiments of the present application, the diisocyanate is selected from aromatic diisocyanates, aliphatic diisocyanates or a combination thereof.

[0065] In some embodiments of the present application, the diisocyanate is selected from toluene diisocyanate, diphenylmethane-4,4'-diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate or a combination thereof. The reaction of the diisocyanate and the special polyether polyol to form a hydroxyl-terminated prepolymer mainly functions as a chain extender or a crosslinking agent.

[0066] In some embodiments of the present application, the active plasticizer is selected from epoxy soybean oil, epoxy linseed oil, epoxy cottonseed oil, epoxy rice bran oil, epoxy sunflower oil or a combination thereof.

[0067] In the embodiments of the present application, the epoxy vegetable oil utilizes the excellent adhesion property of epoxy resin. Through the epoxy groups in its molecules, it can crosslink with the hydrolyzed latent curing agent, so that there are no free plasticizer molecules after the coating is cured, preventing the migration of the plasticizer, and thus preventing the problem of compatibility caused to the asphalt waterproofing membrane.

[0068] In some embodiments of the present application, the pigment extender is selected from fumed silica, nano calcium carbonate, heavy calcium carbonate, modified heavy calcium carbonate, nano kaolin, carbon black, modified kaolin or a combination thereof.

[0069] In the embodiments of the present application, the chemical bonds formed by the chemical reaction of modified epoxy resin, special polyether polyol, diisocyanate, isocyanate group siloxane, active diluent, and Wacker alkoxy-terminated polyether and Zhonghua alkoxy-terminated polyether, and the physical entanglement of the generated macromolecules can enhance the flexibility of the coating film. Combining with the pigment extender can further enhance the heat resistance and weather resistance of the coating film.

[0070] In some embodiments of the present application, the modified epoxy resin includes the structure shown in formula (1):

[0071]

[0072] In formula (1), n is an integer from 1 to 25; R1 is a straight-chain alkylene or branched-chain alkylene with no less than 2 carbon atoms, R2 is an alkyl group of C1-C3, R3 is a straight-chain or branched-chain alkyl group of C1-C3, and m1 + m2 = 3; R4 includes groups with the following structural formulas:

[0073]

[0074] In formula (2), X is an integer from 1 to 3, R5 is H, R6 is an epoxy alkyl group of C3 or C7, R7 is H or methyl, represents the position where R4 is connected to the molecular chain skeleton of the modified epoxy resin. Among them, m1 represents the number of alkyl groups, m2 represents the number of oxyalkyl groups, and m1 + m2 = 3 means that at least one oxyalkyl group or three oxyalkyl groups are connected to the silicon atom connected to R1 in formula (1).

[0075] In the embodiments of the present application, in formula (1), n is an integer from 1 to 2, R1 is propylene, R2 is methyl, R3 is methyl or ethyl. Due to the moderate molecular weight of the modified epoxy resin meeting the above limitations, the overall application effect of the silane-modified polyether waterproof coating is relatively good.

[0076] In formula (2), R4 is a structure shown in any one of formulas (2-a) to (2-d):

[0077]

[0078] In formulas (2-a) to (2-d), R5 is all H, and X is an integer from 1 to 3, represents the position where R4 is connected to the molecular chain skeleton of the modified epoxy resin.

[0079] In the embodiments of the present application, the modified epoxy resin is prepared through the following preparation steps:

[0080] The bisphenol A epoxy resin and the ureido silane coupling agent are mixed and reacted to prepare reactant A; among them, the structural reaction formula for preparing the modified epoxy resin by reacting the bisphenol A epoxy resin and the ureido silane coupling agent is:

[0081]

[0082] In reaction formula (3), n is an integer from 1 to 25, R1 is a straight-chain alkylene or branched-chain alkylene with no less than 2 carbon atoms, R2 is an alkyl group with C1-C3, R3 is a straight-chain or branched-chain alkyl group with C1-C3, and m1 + m2 = 3;

[0083] Under the protection of an inert gas, an acrylic epoxy alkyl ester monomer and an initiator are added to reactant A to prepare a modified epoxy resin; among them, the structural reaction formula for preparing the modified epoxy resin from reactant A and the acrylic epoxy alkyl ester monomer is:

[0084]

[0085]

[0086] In reaction formula (4), n is an integer from 1 to 25, R1 is a straight-chain or branched-chain alkyl group with no less than 2 carbon atoms, R2 is an alkyl group with C1-C3, R3 is a straight-chain or branched-chain alkyl group with C1-C3, and m1 + m2 = 3; R6 is an epoxy alkyl group with C3 or C7, R7 is H or methyl, and R4 includes groups with the following structural formulas:

[0087]

[0088] In formula (2), X is an integer from 1 to 3, R5 is H, R6 is an epoxy alkyl group with C3 or C7, R7 is H or methyl, represents the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0089] In the examples of the present application, the number-average molecular weight of the modified epoxy resin is 900 - 3000. The modified epoxy resin within the above number-average molecular weight range can form better comprehensive properties with other components in the coating.

[0090] In the examples of the present application, in the method for preparing the modified epoxy resin, the bisphenol A epoxy resin, the ureido silane coupling agent, and the acrylic epoxy alkyl ester monomer are added respectively according to a molar ratio of 1:(1 - 1.05):(1 - 3).

[0091] In the embodiments of the present application, the modified epoxy resin has a special molecular structure, that is, its molecular structure contains terminal epoxy groups, alkoxysilyl groups, and epoxyalkyl acrylate monomer-derived segments. Among them, the special polyether polyol reacts with diisocyanate and isocyanate group-containing siloxane successively to generate a prepolymer capped with siloxanyl groups. The hydroxyl groups after hydrolysis of the siloxanyl groups in the modified epoxy resin and the prepolymer can undergo a condensation crosslinking reaction with alkoxy-capped polyether. At the same time, the adhesion of the coating is improved through the condensation reaction between the hydroxyl groups after hydrolysis of the siloxanyl groups and the hydroxyl groups on the concrete base surface, so as to greatly improve the adhesion performance of the coating to the concrete base surface, especially the adhesion performance to the wet concrete base surface, thereby enhancing the adhesion and anti-peeling performance of the coating to the asphalt waterproofing membrane and the concrete base surface. At the same time, the introduced modified epoxy resin, alkoxy-capped polyether, diisocyanate, isocyanate group-containing siloxane, and special polyether polyol can undergo a crosslinking reaction to generate long molecular chains, improving the adhesion, water resistance, weather resistance, and flexibility of the coating film. The terminal epoxy groups in the modified epoxy resin, the epoxy groups on the epoxy acrylate, and the epoxy groups in the active plasticizer further undergo a crosslinking reaction with the hydrolyzed latent curing agent. While enhancing the adhesion performance of the coating and the physical properties of the coating film, the plasticizer molecules are retained in the coating film structure without migration, thus solving the problem of plasticizer migration and the resulting compatibility problem of the asphalt waterproofing membrane.

[0092] In some embodiments of the present application, the bisphenol A epoxy resin is selected from bisphenol A epoxy resin E44, bisphenol A epoxy resin E51, bisphenol A epoxy resin 128, or a combination thereof. The bisphenol A epoxy resin has high strength and adhesion performance, as well as good chemical resistance, and can improve the bonding performance, anti-peeling performance, and weather resistance of the silane-modified polyether waterproof coating. At least the above-mentioned types of bisphenol A epoxy resin purchased from Baling Petrochemical can be selected.

[0093] In some embodiments of the present application, the ureido silane coupling agent is selected from γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane, 3-(diisopropylureidopropyl)triethoxysilane, or a combination thereof.

[0094] In some embodiments of the present application, the initiator is selected from benzoyl peroxide, dibenzoyl peroxide, tert-butyl peroxybenzoate, tert-amyl peroxy-2-ethylhexanoate, 1,1-bis(tert-amylperoxy)cyclohexane, or a combination thereof.

[0095] In some embodiments of the present application, the epoxyalkyl acrylate monomers are selected from 2,3-epoxypropyl acrylate, glycidyl methacrylate, 3,4-epoxycyclohexylmethyl methacrylate, 3,4-epoxycyclohexyl acrylate, or a combination thereof.

[0096] Exemplarily, in some embodiments, the molar ratio of reactant A to glycidyl acrylate, reactant A to glycidyl methacrylate, or reactant A to 3,4-epoxycyclohexylmethyl methacrylate, or reactant A to 3,4-epoxycyclohexyl acrylate, or alternatively, the molar ratio of reactant A to the combination of glycidyl methacrylate and 3,4-epoxycyclohexylmethyl methacrylate can all be 1:(1 - 3). Exemplarily, the molar ratio of reactant A to epoxyalkyl acrylate monomers is 1:1.2, 1:1.5, 1:1.6, 1:1.75, 1:2, 1:2.4, 1:2.7, 1:2.8, 1:2.9, 1:3.

[0097] In some embodiments of the present application, the inert gas is selected from helium, nitrogen, argon or a combination thereof.

[0098] Exemplarily, the preparation method of the modified epoxy resin includes: putting a calculated amount of dried bisphenol A epoxy resin E44 into a reactor, adding a mixed solvent of n-butanol and N,N-dimethylformamide with a volume ratio of 1:1, and the amount of the mixed solvent is 10wt.% - 15wt.% of the total mass of the reaction. Start stirring until the bisphenol A epoxy resin E44 is completely dissolved, and control the temperature of the material liquid to be 45°C - 50°C to obtain a dispersion of bisphenol A epoxy resin E44; dropwise add a calculated amount of ureido silane coupling agent to the dispersion of bisphenol A epoxy resin E44 in the reactor, and react at a constant temperature for 2 hours - 3 hours under a nitrogen protection atmosphere to obtain reactant A; it undergoes the reaction shown in reaction formula (3):

[0099]

[0100] Continue to stir reactant A under nitrogen protection to make the temperature of reactant A be 80°C - 85°C; then add a calculated amount of glycidyl methacrylate and benzoyl peroxide to reactant A in the reactor, and the addition amount of benzoyl peroxide is 0.3wt.% - 0.5wt.% of the total mass of the reaction; continue to stir and raise the temperature to 90°C - 95°C and react at a constant temperature for 6 hours - 7 hours; then evacuate the product and perform vacuum distillation for 0.5 hours - 1 hour to obtain the modified epoxy resin; it undergoes the reaction shown in reaction formula (5):

[0101]

[0102]

[0103] In the above reaction formulas (3) and (5), n is an integer from 1 to 25, and X is an integer from 1 to 3; R1 is a straight-chain alkylene or branched-chain alkylene with no less than 2 carbon atoms, R2 is an alkyl group with 1 to 3 carbon atoms, R3 is a straight-chain or branched-chain alkyl group with 1 to 3 carbon atoms, and m1 + m2 = 3; R4 includes groups with the following structural formulas:

[0104]

[0105] In formula (2-b), X is an integer from 1 to 3, and R5 is H, indicating the position where R4 is connected to the molecular chain backbone of the modified epoxy resin. Among them, bisphenol A epoxy resin E44, ureido silane coupling agent, and glycidyl methacrylate are added respectively according to a molar ratio of (1 to 1.05):1:(1 to 3).

[0106] It can be understood that replacing glycidyl methacrylate with 2,3-epoxypropyl acrylate or 3,4-epoxycyclohexylmethyl methacrylate or 3,4-epoxycyclohexyl acrylate, or replacing it with glycidyl methacrylate and 3,4-epoxycyclohexylmethyl methacrylate, or replacing it with 2,3-epoxypropyl acrylate and 3,4-epoxycyclohexylmethyl methacrylate, similar reactions can occur. Correspondingly, the glycidyl methacrylate in reaction formula (5) is replaced with 3,4-epoxycyclohexylmethyl methacrylate shown in the following formula (6):

[0107]

[0108] R4 is then a group including the following structural formulas:

[0109]

[0110] In formula (2-d), X is an integer from 1 to 3, and R5 is H, indicating the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0111] In some embodiments of the present application, the latent curing agent is selected from aldehyde imines, ketone imines, oxazolidines or combinations thereof.

[0112] In some embodiments of the present application, the latent curing agent is selected from XY-401, YRLH-1106, JW505 or combinations thereof.

[0113] In some embodiments of the present application, the water scavenger is selected from vinyltrimethoxysilane, vinyltriacetoxysilane, vinyltriethoxysilane or combinations thereof.

[0114] In some embodiments of the present application, the promoter is selected from triacetoxyethylsilane, vinyltriacetoxysilane, diethyldiacetoxysilane, or a combination thereof.

[0115] In some embodiments of the present application, the catalyst is selected from dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, chelating tin catalyst, or a combination thereof.

[0116] In some embodiments of the present application, the chelating tin catalyst is selected from U-220H, WCAT-NS01, SG-U303, or a combination thereof.

[0117] In a second aspect, the present application provides a method for preparing a silane-modified polyether waterproof coating, comprising: dispersing and treating Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, and active plasticizer to obtain a first dispersion slurry; heating the first dispersion slurry to 90°C to 100°C and adding pigments and fillers for dispersion treatment to obtain a second dispersion slurry; heating the second dispersion slurry to 100°C to 110°C, evacuating to perform dehydration treatment to obtain a dehydrated product; cooling the dehydrated product to 85°C to 90°C, adding isocyanate group siloxane and diisocyanate, and reacting under inert gas protection to obtain a first reaction product; cooling the first reaction product to 60°C to 70°C, adding modified epoxy resin and latent curing agent, and performing vacuum dispersion treatment to obtain a first modified product; cooling the first modified product to 50°C to 60°C, adding water scavenger and promoter, and performing vacuum dispersion treatment to obtain a second modified product; adding a catalyst to the second modified product and performing vacuum dispersion treatment to obtain the silane-modified polyether waterproof coating.

[0118] The preparation method of the silane-modified polyether waterproof coating according to the embodiments of the present application is as follows: First, disperse Wacker silane-modified polyether, Zhonghua silane-modified polyether, epoxy active plasticizer, and pigments and fillers to obtain a second dispersion slurry with uniform dispersion of each substance. Then, by introducing a latent curing agent and a self-made modified epoxy resin, the special molecular structure in the modified epoxy resin can improve the adhesion and anti-peeling performance to the waterproof coil. Among them, after the alkoxysilyl group in the modified epoxy resin molecule is hydrolyzed, it can undergo a condensation cross-linking reaction with the alkoxy-terminated polyether. The introduction of the modified epoxy resin improves the adhesion, water resistance, heat resistance, weather resistance, and flexibility of the coating film. At the same time, the adhesion is improved by the condensation reaction between the hydroxyl group after hydrolysis of the alkoxysilyl group and the hydroxyl group on the base surface, which can greatly improve the adhesion performance to the concrete base surface, especially the wet concrete base surface. In addition, the epoxy group in the modified epoxy resin molecule and the epoxy group in the epoxy plasticizer further cross-link with the hydrolyzed latent curing agent to fully exert the excellent adhesion characteristics of the epoxy resin. While improving the bonding strength of the coating, there are no free plasticizer molecules after the coating is cured, solving the problems of plasticizer migration and its resulting compatibility with the waterproof coil. Finally, a water remover, a promoter, and a catalyst are added to cross-link the coating components to obtain the silane-modified polyether waterproof coating. During the curing process of the silane-modified polyether waterproof coating according to the embodiments of the present application, no bubbles are generated, and it is hardly affected by the construction temperature and humidity.

[0119] In some embodiments of the present application, the dispersion treatment of Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, active plasticizer, and pigments and fillers to obtain a second dispersion slurry includes: dispersing Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, and active plasticizer to obtain a first dispersion slurry; heating the first dispersion slurry to 90°C to 100°C and adding pigments and fillers for dispersion treatment to obtain a second dispersion slurry.

[0120] In some embodiments of the present application, the preparation method of the silane-modified polyether waterproof coating further includes: cooling the silane-modified polyether waterproof coating to ≤50°C and filling it with nitrogen for protection.

[0121] Exemplarily, the preparation method of the silane-modified polyether waterproof coating includes: adding Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, and active plasticizer into a reactor for dispersion treatment to obtain a first dispersion slurry; heating the first dispersion slurry to 90°C - 100°C and adding pigments and fillers for dispersion treatment to obtain a second dispersion slurry; heating the second dispersion slurry to 100°C - 110°C, evacuating to perform dehydration treatment for 3 - 4 hours to obtain a dehydrated product; cooling the dehydrated product to 60°C - 70°C, adding modified epoxy resin and latent curing agent and performing vacuum dispersion treatment for 0.5 - 1 hour to obtain a first modified product; cooling the first modified product to 50°C - 60°C, adding water scavenger and accelerator and performing vacuum dispersion treatment for 0.5 - 1 hour to obtain a second modified product; adding a catalyst to the second modified product and performing vacuum dispersion treatment for 0.5 - 1 hour, cooling the product to ≤50°C, filling with nitrogen for protection, and discharging to obtain the silane-modified polyether waterproof coating.

[0122] In a third aspect, an embodiment of the present application provides a use of a modified epoxy resin for preparing a silane-modified polyether waterproof coating, wherein the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups, and an epoxyalkyl acrylate monomer-derived segment. An appropriate amount of the modified epoxy resin prepared by the foregoing preparation method of the modified epoxy resin of the present application can be added to the silane-modified polyether waterproof coating.

[0123] Test part

[0124] The sources of the raw materials used in the following examples are as follows: Bisphenol A epoxy resin E44 was purchased from Baling Petrochemical; Wacker alkoxy-terminated polyether: STP-E35 was purchased from Wacker Chemie (China) Co., Ltd.; Zhonghua alkoxy-terminated polyether: SAX750 was purchased from Zhonghua Trading (Shanghai) Co., Ltd.; Catalyst: SG-U303 was purchased from Guangzhou Jianyi Chemical Import and Export Co., Ltd. Aldimine-type latent curing agent XY-401 was purchased from Suzhou Xiangyuan New Materials Co., Ltd.; Ureido silane coupling agent, γ-ureidopropyltrimethoxysilane. Other raw materials not specifically stated are ordinary commercially available products or raw materials prepared by the applicant.

[0125] Preparation of modified epoxy resin

[0126] Preparation Example 1

[0127] The modified epoxy resin (N1) was prepared through the following steps:

[0128] The calculated amount of dried bisphenol A epoxy resin E44 was put into a reactor, and a mixed solvent of n-butanol and N,N-dimethylformamide with a volume ratio of 1:1 was added. The amount of the mixed solvent used was 12 wt.% of the total mass of the reaction. Stirring was started until bisphenol A epoxy resin E44 was completely dissolved, and the temperature of the feed liquid was controlled at 45°C to 50°C to obtain a dispersion of bisphenol A epoxy resin E44. A calculated amount of ureido silane coupling agent was added dropwise to the dispersion of bisphenol A epoxy resin E44 in the reactor, and the reaction was carried out at a constant temperature for 3 hours under a nitrogen protection atmosphere to obtain reactant A. Reactant A was continuously stirred under nitrogen protection to make the temperature of reactant A 80°C to 85°C. Then, a calculated amount of glycidyl methacrylate and benzoyl peroxide were added to reactant A in the reactor. The addition amount of benzoyl peroxide was 0.3 wt.% of the total mass of the reaction. Stirring was continued and the temperature was raised to 90°C to 95°C and the reaction was carried out at a constant temperature for 6 hours. Then, the product was evacuated and distilled under reduced pressure for 1 hour to obtain a modified epoxy resin, denoted as N1. Among them, bisphenol A epoxy resin E44, ureido silane coupling agent and glycidyl methacrylate were added according to a molar ratio of 1:1.02:1, and the epoxy equivalent of the modified epoxy resin (N1) was 407 g / mol.

[0129] Preparation Example 2

[0130] The preparation method of the modified epoxy resin (N2) is only different from the preparation method of Preparation Example 1 in that: bisphenol A epoxy resin E44, ureido silane coupling agent and glycidyl methacrylate were added according to a molar ratio of 1:1.02:2, and the obtained modified epoxy resin was denoted as N2, and the epoxy equivalent of the modified epoxy resin (N2) was 318 g / mol.

[0131] Preparation Example 3

[0132] The preparation method of the modified epoxy resin (N3) is only different from the preparation method of Preparation Example 1 in that: among them, bisphenol A epoxy resin E44, ureido silane coupling agent and glycidyl methacrylate were added according to a molar ratio of 1:1.02:3, and the obtained modified epoxy resin was denoted as N3, and the epoxy equivalent of the modified epoxy resin (N3) was 274 g / mol.

[0133] Comparative Preparation Example 1

[0134] The preparation process of the modified epoxy resin (D1) is only different from that of Preparation Example 1 in that: glycidyl methacrylate was not added during the preparation process, and the obtained modified epoxy resin was denoted as D1, and the epoxy equivalent of the modified epoxy resin (D1) was 672 g / mol.

[0135] Comparative Preparation Example 2

[0136] The preparation process of the modified epoxy resin (D2) is only different from that of Preparation Example 1 in that: during the preparation process, no ureido silane coupling agent is added, and the modified epoxy resin is obtained, denoted as D2. Among them, the epoxy equivalent of the modified epoxy resin (D2) is 197 g / mol.

[0137] Example 1

[0138] A silane-modified polyether waterproof coating comprises the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, including 340 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N1), 8 parts by weight, the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 part by weight.

[0139] The preparation method of the silane-modified polyether waterproof coating in this example includes: dispersing Wacker alkoxy-terminated polyether STP-E35, Zhonghua alkoxy-terminated polyether SAX750, special polyether polyol water-soluble polyether NJ-480S, and active plasticizer epoxy soybean oil to obtain the first dispersion slurry; heating the first dispersion slurry to 90 °C - 100 °C and adding heavy calcium carbonate and nano calcium carbonate as pigment and filler for dispersion treatment to obtain the second dispersion slurry; heating the second dispersion slurry to 100 °C - 110 °C, evacuating to carry out dehydration treatment for 3 hours to obtain a dehydrated product; cooling the dehydrated product to 85 °C - 90 °C, adding isocyanatosiloxane and diisocyanate and reacting under nitrogen protection for 3 hours to obtain the first reaction product; cooling the first reaction product to 60 °C - 70 °C, adding the modified epoxy resin and aldehyde imine type latent curing agent XY-401 and carrying out vacuum dispersion treatment for 0.5 hour to obtain the first modified product; cooling the first modified product to 50 °C - 60 °C, adding the water scavenger and accelerator and carrying out vacuum dispersion treatment for 0.5 hour to obtain the second modified product; adding a catalyst to the second modified product and carrying out vacuum dispersion treatment for 0.5 hour, cooling the product to 40 °C, filling with nitrogen for protection, and discharging to obtain the silane-modified polyether waterproof coating.

[0140] Example 2

[0141] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Kaneka alkoxy-terminated polyether SAX750, 98 parts by weight; water-soluble polyether NJ-480S, 20 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; toluene diisocyanate, 4 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, including 340 parts by weight of heavy calcium carbonate and 260 parts by weight of modified heavy calcium carbonate; modified epoxy resin (N1), 8 parts by weight, the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0142] Example 3

[0143] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Kaneka alkoxy-terminated polyether SAX750, 98 parts by weight; water-soluble polyether NJ-480S, 20 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; toluene diisocyanate, 4 parts by weight; active plasticizer, epoxy soybean oil, 220 parts by weight; pigment and filler, including 340 parts by weight of heavy calcium carbonate and 260 parts by weight of modified heavy calcium carbonate; modified epoxy resin (N1), 8 parts by weight, the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 11 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.6 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0144] Example 4

[0145] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N1), 10 parts by weight, the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0146] Example 5

[0147] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N1), 12 parts by weight, the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0148] Example 6

[0149] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N2), 8 parts by weight; the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0150] Example 7

[0151] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N3), 8 parts by weight; the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0152] Example 8

[0153] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 32 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N1), 8 parts by weight, containing terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0154] Example 9

[0155] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 5 parts by weight; diphenylmethane-4,4'-diisocyanate, 7 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N1), 8 parts by weight, containing terminal epoxy groups, alkoxysilyl groups and epoxyalkyl acrylate monomer-derived segments; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0156] Example 10

[0157] A silane-modified polyether waterproof coating, comprising the following components calculated by weight: Wacker alkoxy-terminated polyether STP-E35, 100 parts by weight; Zhonghua alkoxy-terminated polyether SAX750, 88 parts by weight; water-soluble polyether NJ-480S, 30 parts by weight; γ-isocyanatopropyltrimethoxysilane, 3 parts by weight; diphenylmethane-4,4'-diisocyanate, 8 parts by weight; active plasticizer, epoxy soybean oil, 224 parts by weight; pigment and filler, 500 parts by weight, including 240 parts by weight of heavy calcium carbonate and 260 parts by weight of nano calcium carbonate; modified epoxy resin (N1), 8 parts by weight, containing terminal epoxy group, alkoxysilyl group and epoxyalkyl acrylate monomer-derived chain segment; aldehyde imine type latent curing agent XY-401, 13 parts by weight; water scavenger, vinyltrimethoxysilane, 6 parts by weight; accelerator, triacetoxyethylsilane, 2 parts by weight; chelating tin catalyst SG-U303, 0.8 parts by weight. The preparation method of the silane-modified polyether waterproof coating in this example is the same as that in Example 1.

[0158] Comparative Example 1

[0159] A silane-modified polyether waterproof coating, the difference in its composition and preparation process from that in Example 1 is that: it does not contain the water-soluble polyether NJ-480S in Example 1, and uses the same weight portion of SAX750 to replace it.

[0160] Comparative Example 2

[0161] A silane-modified polyether waterproof coating, the difference in its composition and preparation process from that in Example 1 is that: it does not contain the epoxy soybean oil in Example 1, and uses the same weight portion of ordinary plasticizer dibutyl phthalate to replace it.

[0162] Comparative Example 3

[0163] A silane-modified polyether waterproof coating, the difference in its composition and preparation process from that in Example 1 is that: it does not contain the modified epoxy resin in Example 1, and uses the same weight portion of aldehyde imine curing agent XY-401 to replace it.

[0164] Comparative Example 4

[0165] A silane-modified polyether waterproof coating, the difference in its composition and preparation process from that in Example 1 is that: it does not contain the water-soluble polyether NJ-480S and modified epoxy resin in Example 1, and uses the same weight portions of SAX750 and aldehyde imine curing agent XY-401 to replace them respectively.

[0166] Comparative Example 5

[0167] A silane-modified polyether waterproof coating, the difference in its composition and preparation process from that in Example 1 is that: the modified epoxy resin 1 in Example 1 is replaced by modified epoxy resin D1.

[0168] Comparative Example 6

[0169] A silane-modified polyether waterproof coating, the difference in its composition and preparation process from that of Example 1 lies in that: the modified epoxy resin 1 in Example 1 is replaced by modified epoxy resin D2.

[0170] Performance Test

[0171] Perform performance tests on the silane-modified polyether waterproof coatings prepared in Examples 1-10 and Comparative Examples 1-6. The test items and methods are as follows:

[0172] 1. Performance Test of the Coating Film of Silane-Modified Polyether Waterproof Coating

[0173] The performance test of the coating film of the silane-modified polyether waterproof coating is carried out with reference to JC / T2435-2018. Among them, t1 represents the surface drying time (h), t2 represents the through drying time (h), T L represents the tensile strength (MPa) of the coating, E represents the elongation at break (%), and T s represents the tear strength (N / mm).

[0174] 2. Test of the Composite Peel Strength of Asphalt Waterproofing Membrane

[0175] Stack the silane-modified polyether waterproof coatings prepared in Examples 1-10 and Comparative Examples 1-6 with asphalt waterproofing membranes with release films (Keshun APF-3000), and test their 180° peel strength after stacking. Specifically, it includes:

[0176] (1) Prepare test pieces: By cold construction, the silane-modified polyether waterproof coatings prepared in Examples 1-10 and Comparative Examples 1-6 are respectively coated on concrete substrates with a specification of 400mm*200mm*40mm to form a coating layer with a coating thickness of 1.5±0.2mm; after coating, during the coating adaptation period, tear off the release film of the asphalt waterproofing membrane and lay it on the coating layer, press it firmly and fully bond it so that the asphalt waterproofing membrane and the silane-modified polyether waterproof coating are in a fully bonded state. After curing for 168h, cut the asphalt waterproofing membrane to obtain test pieces, and keep the preset size of the bonding surface as 70*50mm; measure the 180° peel strength of the test pieces (that is, the composite peel strength of the coating film of the coating and the waterproofing membrane, represented by σ, with the unit of N / mm).

[0177] (2) Test method: Install the cement mortar block surface in the fixture at one end of the electronic tensile testing machine for each of the test pieces corresponding to Examples 1 - 10 and Comparative Examples 1 - 6. Bend the unbonded surface of the asphalt waterproofing membrane cut from the test piece by 180° and clamp it in the fixture at the other end of the electronic tensile testing machine with the bonding surface facing each other. Pay attention to accurately positioning the test piece of the chuck to ensure that the applied tensile force is evenly distributed across the width of the test piece. Start the testing equipment and set the tensile speed to 100 mm / min.

[0178] 3. Adhesion strength test on wet base surface

[0179] Conduct the adhesion strength test of the silane - modified polyether waterproof coating on the base surface and on the wet base surface in accordance with the provisions of GB / T16777 - 2008. σ a represents the adhesion strength (Mpa), and σ b represents the adhesion strength on the wet base surface (Mpa).

[0180] 4. Test for volatile organic compound content (VOC)

[0181] Conduct it according to the reactive waterproof coating in JC 1066 - 2008. Among them, VOC represents the content of volatile organic compounds, and the unit is: g / L.

[0182] Record the test results of the above performance tests in Table 1 below:

[0183]

[0184] After the coating film formed by the silane - modified polyether waterproof coating of this application is bonded to the asphalt waterproofing membrane, the asphalt waterproofing membrane layer shows cohesive failure, indicating that the interfacial adhesion between the coating film and the asphalt waterproofing membrane is greater than the cohesive strength of the asphalt waterproofing membrane material itself. While interfacial failure indicates that the interfacial adhesion between the coating film and the asphalt waterproofing membrane is less than the cohesive strengths of the coating film and the asphalt waterproofing membrane materials themselves respectively.

[0185] The low composite peel strength and cohesive failure between the coating film and the asphalt waterproofing membrane may be related to the fact that the plasticizer or solvent in the coating migrates into the asphalt layer of the asphalt waterproofing membrane, resulting in softening and swelling of the asphalt layer, and poor wetting with the concrete base surface, causing low peel strength and decreased cohesive force.

[0186] Comparing the component ratios of the silane - modified polyether waterproof coatings in Examples 1 - 10 and Comparative Examples 1 - 6 and the test results in Table 1, it can be seen that for the silane - modified polyether waterproof coatings in Examples 1 - 10, the adhesion strength to the concrete base surface (σ a ), and the adhesion strength to the wet concrete base surface (σ b), composite peeling strength (σ) with asphalt waterproofing membrane, peeling failure form and other performances are more excellent; the bonding performance of the silane-modified polyether waterproof coating and the composite peeling strength with asphalt waterproofing membrane in Comparative Examples 1 to 6 are significantly lower than the bonding performance of the silane-modified polyether waterproof coating and the composite peeling strength of the silane-modified polyether waterproof coating and asphalt waterproofing membrane in Examples 1 to 10.

[0187] It can be clearly seen from the test data of the composite peel strength (σ) of the silane-modified polyether waterproof coating and the asphalt waterproof membrane of Examples 1-10 and Comparative Examples 1-6 and the failure form that the use and increase of the water-soluble polyether NJ-480S in the silane-modified polyether waterproof coating of Examples 1 and 8 can significantly improve the bonding performance to the wet concrete substrate, and the joint use of the active plasticizer with epoxy groups, the modified epoxy resin and the diisocyanate in the silane-modified polyether waterproof coating of Examples 1-10 improves the bonding performance of the silane-modified polyether waterproof coating to the asphalt waterproof membrane, and also improves the bonding performance of the silane-modified polyether waterproof coating to the concrete substrate, especially improves the bonding performance of the silane-modified polyether waterproof coating to the wet concrete substrate.

[0188] By comparing the test results of Example 1, Example 4 and Example 5, it can be concluded that increasing the amount of modified epoxy resin will lead to a certain degree of improvement in the tensile strength, bonding performance and peeling performance of the coating with asphalt waterproofing membrane, but will lead to a certain degree of decrease in elongation at break. It can be seen from Example 1, Example 6 and Example 7 that with the increase of glycidyl methacrylate in the modified epoxy resin, the tensile strength of the silane-modified polyether waterproof coating gradually increases, the elongation at break gradually decreases, and the change in the bonding and peeling performance is not obvious.

[0189] By comparing the test results of Example 1 and Example 8, it can be concluded that as the amount of water-soluble polyether NJ-480S is increased, the bonding performance of the silane-modified polyether waterproof coating to the wet concrete base surface is gradually improved, but the tensile strength decreases to a certain extent.

[0190] From the test results of Example 1 and Example 9, it can be concluded that by increasing the amount of isocyanate siloxane, that is, increasing the amount of γ-isocyanate propyltrimethoxysilane, the bonding strength of the silane-modified polyether waterproof coating gradually increases, but the elongation at break decreases.

[0191] From the test results of Example 1 and Example 10, it can be concluded that by increasing the amount of diisocyanate, that is, increasing the amount of diphenylmethane-4,4'-diisocyanate, the tensile strength of the silane-modified polyether waterproof coating gradually increases, the surface drying time and the actual drying time are shortened, but the elongation at break decreases, and other properties change little.

[0192] In addition, compared with the VOC volatilities of 4 g / L to 15 g / L in Comparative Examples 1-6, the silane-modified polyether waterproof coatings in Examples 1-10 of the present application effectively shorten the surface drying time to less than 0.8 h, and shorten the through drying time to less than 2.1 h, and reduce the amount of VOC to less than 4 g / L, significantly reducing the VOC volatility.

[0193] As described above, the foregoing is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process described above can refer to the corresponding process in the foregoing method embodiments and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application.

Claims

1. A silane-modified polyether waterproof coating, characterized in that, Comprising the following components by weight parts: Wacker alkoxy-terminated polyether, 100 parts by weight; Kaneka alkoxy-terminated polyether, 86 - 120 parts by weight; Special polyether polyol, 18 - 32 parts by weight, and the functionality of the alcohol hydroxyl groups in the special polyether polyol is 3; Isocyanate group-containing siloxane, 2 - 5 parts by weight; Diisocyanate, 5 - 8 parts by weight; Reactive plasticizer, 180 - 250 parts by weight; Pigment and filler, 340 - 650 parts by weight; Latent curing agent, 4 - 16 parts by weight; Water scavenger, 4 - 10 parts by weight; Accelerator, 1 - 3 parts by weight; Catalyst, 0.6 - 2.3 parts by weight; Modified epoxy resin, 5 - 13 parts by weight; the modified epoxy resin contains terminal epoxy groups, alkoxysilyl groups, and a chain segment derived from epoxyalkyl acrylate monomers; the modified epoxy resin includes the structure shown in formula (1): In formula (1), n is an integer from 1 to 25; R1 is a straight-chain or branched-chain alkylene with at least 2 carbon atoms, R2 is an alkyl group of C1 - C3, R3 is a straight-chain or branched-chain alkyl group of C1 - C3, and m1 + m2 = 3; R4 includes groups with the following structural formula: position.

2. The silane-modified polyether waterproof coating according to claim 1, wherein Meet any of the following requirements: 1), In formula (1), n is an integer from 1 to 2; R1 is propylene, R2 is methyl, and R3 is methyl or ethyl; 2), In formula (2), R4 is a structure shown in any one of formula (2 - a) to formula (2 - d): In formulas (2-a) to (2-d), R5 is H in each case, and X is an integer from 1 to 3. It represents the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

3. The silane-modified polyether waterproof coating according to claim 1 or 2, characterized in that, The modified epoxy resin is prepared through the following steps: Mix bisphenol A epoxy resin and ureido silane coupling agent for reaction to prepare reactant A; among them, the reaction formula (3) for the reaction of bisphenol A epoxy resin and ureido silane coupling agent to prepare the modified epoxy resin is: In reaction formula (3), n is an integer from 1 to 25, R1 is a straight-chain or branched-chain alkylene with at least 2 carbon atoms, R2 is an alkyl group of C1 - C3, R3 is a straight-chain or branched-chain alkyl group of C1 - C3, and m1 + m2 = 3; Under the protection of inert gas, add acrylic epoxyalkyl ester monomers and initiator to reactant A to prepare the modified epoxy resin; among them, the reaction formula (4) for the reaction of reactant A and acrylic epoxyalkyl ester monomers to prepare the modified epoxy resin is: In reaction formula (4), n is an integer from 1 to 25, R1 is a straight-chain or branched-chain alkylene with at least 2 carbon atoms, R2 is an alkyl group of C1 - C3, R3 is a straight-chain or branched-chain alkyl group of C1 - C3, and m1 + m2 = 3; R6 is an epoxyalkyl group of C3 or C7, R7 is H or methyl, and R4 includes groups with the following structural formula: position.

4. The silane-modified polyether waterproof coating according to claim 3, characterized in that, Meet at least one of the following requirements: The bisphenol A epoxy resin is selected from bisphenol A epoxy resin E44, bisphenol A epoxy resin E51, bisphenol A epoxy resin 128, or a combination thereof; The ureido silane coupling agent is selected from γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane, 3-(diisopropylureidopropyl)triethoxysilane, or a combination thereof; The initiator is selected from benzoyl peroxide, dibenzoyl peroxide, tert-butyl peroxybenzoate, tert-amyl peroxy-2-ethylhexanoate, 1,1-bis(tert-amylperoxy)cyclohexane or a combination thereof; The bisphenol A epoxy resin, ureido silane coupling agent and the acrylic epoxy alkyl ester monomer are added according to a molar ratio of 1:(1-1.05):(1-3) respectively; The acrylic epoxy alkyl ester monomer is selected from glycidyl acrylate, glycidyl methacrylate, 3,4-epoxycyclohexylmethyl methacrylate, 3,4-epoxycyclohexyl acrylate or a combination thereof.

5. The silane-modified polyether waterproof coating according to claim 1, characterized in that, Meet at least one of the following requirements: The epoxy equivalent of the modified epoxy resin is 260 g / mol to 430 g / mol; The Wacker alkoxy-terminated polyether is selected from STP-E35, STP-E30, STP-E15 and STP-E10 or a combination thereof; The Kaneka alkoxy-terminated polyether is selected from SAX227, SAX327, SAX220 and SAX750 or a combination thereof; The special polyether polyol is selected from water-soluble polyethers NJ-480S, NJ-2442 or a combination thereof; The isocyanate group siloxane is selected from γ-isocyanate propyl trimethoxysilane, γ-isocyanate propyl triethoxysilane, isocyanate methyl trimethoxysilane or a combination thereof; The diisocyanate is selected from aromatic diisocyanates, aliphatic diisocyanates or a combination thereof; The active plasticizer is selected from epoxy soybean oil, epoxy linseed oil, epoxy cottonseed oil, epoxy rice bran oil, epoxy sunflower oil or a combination thereof; The pigment and filler are selected from fumed silica, nano calcium carbonate, heavy calcium, nano kaolin, carbon black, modified kaolin or a combination thereof; The latent curing agent is selected from aldehyde imines, ketone imines, oxazolidines or a combination thereof; The water scavenger is selected from vinyl trimethoxysilane, vinyl triacetoxysilane, vinyl triethoxysilane or a combination thereof; The promoter is selected from triacetoxyethylsilane, vinyl triacetoxysilane, diethyldiacetoxysilane or a combination thereof; The catalyst is selected from dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, chelated tin catalyst or a combination thereof.

6. The silane-modified polyether waterproof coating according to claim 5, characterized in that, Meet at least one of the following requirements: The diisocyanate is selected from toluene diisocyanate, diphenylmethane-4,4'-diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate or a combination thereof; The pigment and filler can be modified heavy calcium; The latent curing agent is selected from XY-401, YRLH-1106, JW505 or a combination thereof; The chelated tin catalyst is selected from U-220H, WCAT-NS01, SG-U303 or a combination thereof.

7. A method for preparing a silane-modified polyether waterproof coating according to any one of claims 1-6, characterized in that, Include: Disperse the Wacker alkoxy-terminated polyether, Kaneka alkoxy-terminated polyether, special polyether polyol, active plasticizer and pigment and filler to obtain a second dispersion slurry; Heat the second dispersion slurry to 100°C to 110°C, evacuate to carry out dehydration treatment to obtain a dehydrated product; Cool the dehydrated product to 85°C to 90°C, add the isocyanate group-containing siloxane and the diisocyanate, and react under the protection of an inert gas to obtain a first reaction product; Cool the first reaction product to 60°C to 70°C, add the modified epoxy resin and the latent curing agent, and carry out vacuum dispersion treatment to obtain a first modified product; Cool the first modified product to 50°C to 60°C, add the water remover and the accelerator, and carry out vacuum dispersion treatment to obtain a second modified product; Add a catalyst to the second modified product and react to obtain a silane-modified polyether waterproof coating.

8. The preparation method of the silane-modified polyether waterproof coating according to claim 7, characterized in that, Disperse the Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, active plasticizer, pigment and filler to obtain a second dispersion slurry, including: Disperse the Wacker alkoxy-terminated polyether, Zhonghua alkoxy-terminated polyether, special polyether polyol, and active plasticizer to obtain a first dispersion slurry; Heat the first dispersion slurry to 90°C to 100°C and add the pigment and filler for dispersion treatment to obtain a second dispersion slurry.

9. Use of a modified epoxy resin for preparing a silane-modified polyether waterproof coating, wherein, The modified epoxy resin contains a terminal epoxy group, an alkoxysilyl group, and an epoxyalkyl acrylate monomer-derived chain segment, and the modified epoxy resin is the modified epoxy resin having the structure shown in formula (1) in claim 1.

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