Silane modified polyether waterproof coating, preparation method thereof and application of modified epoxy resin

Abstract

The invention discloses a silane modified polyether waterproof coating, a preparation method thereof and application of modified epoxy resin. The coating comprises the following components in parts by weight: 100 parts by weight of Wacker alkoxy terminated polyether; 62 to 95 parts by weight of a clocked alkoxy terminated polyether; 40-80 parts by weight of hydroxyl silicone oil; 230-350 parts by weight of an epoxy active plasticizer; 400-720 parts by weight of a pigment filler; 12-18 parts by weight of modified epoxy resin containing an epoxy-terminated group, an alkoxy silane group and an epoxy alkyl acrylate monomer derivative chain segment; 4-21 parts by weight of a latent curing agent; 6-11 parts by weight of a dewatering agent; 1-3 parts by weight of an accelerant; and 1-2.5 parts by weight of a catalyst. The alkoxy silane hydrolysis of the modified epoxy resin and the hydroxyl crosslinking of the alkoxy-terminated polyether, the hydroxyl silicone oil and the basal plane improve the bonding force, and the modified epoxy resin and the hydroxyl silicone oil improve the bonding and anti-stripping performance of the coiled material. And the hydrolyzed latent curing agent reacts with epoxy groups of the modified epoxy resin and the epoxy active plasticizer to prevent migration.

Description

Technical Field

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

[0002] Silane-modified polyether waterproof coating is a one-component, solvent-free waterproof coating made of modified polyether resin as the base polymer, 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 silicone modified polyether resin, initially appeared mainly in the form of end-silane polyether sealant. Silane polyether sealant is also known as MS sealant, silicone modified polyether sealant and modified silicone sealant. When used, it is coated on the base layer and cured by reaction with moisture to form a continuous and seamless polymer elastic waterproof membrane. Silane-modified polyether waterproof coating can be used on roofs, exterior walls and other parts with the application of an appropriate protective layer. The coating can be applied to the designed thickness in one application by scraping, rolling, brushing, spraying and other construction methods, saving time and construction costs.

[0003] In the field of building waterproofing, silane-modified polyether waterproof coatings can be used for cold construction of some waterproof membranes to form a second waterproof layer. The silane-modified polyether waterproof coatings and the surface of the waterproof membrane can form a good bonding interface, showing excellent bonding properties. The formed coating membrane bonding layer has excellent bonding properties, the bonding layer is tight and impermeable, has excellent performance, excellent overall waterproof effect, and long service life. It has been promoted as a new type of waterproof coating. However, the inventors of the present application found in the process of using silane-modified polyether waterproof coatings that the migration of plasticizers in conventional silane-modified polyether waterproof coatings will cause compatibility problems with waterproof coiled materials. The migration of plasticizers will cause swelling of waterproof coiled materials, especially waterproof coiled materials composed of components such as asphaltene and butyl colloid, and reduce the cohesive force and adhesive peeling performance of the coiled material components themselves to varying degrees. At the same time, conventional silane-modified polyether waterproof coatings are not ideal for cement-based surfaces, have low bonding performance, and have certain requirements for the dryness of the base surface. They are not easy to apply and construct on concrete base surfaces with clear water. The coating has poor wettability, and the bonding strength decreases significantly. The bonding effect is poor and cannot meet the construction progress requirements and waterproof requirements. Therefore, how to prepare a silane-modified polyether waterproof coating that has excellent bonding, does not cause compatibility problems such as plasticizer migration on waterproof coiled materials, and can be directly constructed on a wet base surface has become a problem that needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present application provides a silane-modified polyether waterproof coating and a preparation method thereof. The silane-modified polyether waterproof coating obtained can be directly constructed on a damp concrete base surface, improves the bonding performance and anti-peeling performance with the waterproof membrane, and prevents plasticizer migration.

[0005] In the first aspect, the present application provides a silane-modified polyether waterproof coating, comprising the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether; 62 to 95 parts by weight of alkoxy-terminated polyether; 40 to 80 parts by weight of hydroxy silicone oil; 230 to 350 parts by weight of epoxy reactive plasticizer; 400 to 720 parts by weight of pigments and fillers; 12 to 18 parts by weight of modified epoxy resin; modified epoxy resin containing terminal epoxy groups, alkoxysilane groups and epoxyalkyl acrylate monomer derived segments; latent curing agent, 4 to 21 parts by weight; dehydrating agent, 6 to 11 parts by weight; accelerator, 1 to 3 parts by weight; catalyst, 1 to 2.5 parts by weight.

[0006] According to an embodiment 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 an embodiment of the first aspect of the present application, the Wacker alkoxy-terminated polyether is selected from STP-E35, STP-E30, STP-E15, STP-E10 or a combination thereof.

[0008] According to an embodiment of the first aspect of the present application, the potassium alkoxy terminated polyether is selected from SAX227, SAX327, SAX220, SAX750 or a combination thereof.

[0009] According to an embodiment of the first aspect of the present application, the hydroxy silicone oil is selected from hydroxyl-terminated polydimethylsiloxane with a viscosity of 350 cs to 750 cs or a combination thereof.

[0010] According to an embodiment of the first aspect of the present application, the epoxy-reactive plasticizer is selected from epoxy soybean oil, epoxy linseed oil, epoxy cottonseed oil, epoxy rice bran oil, epoxy sunflower oil or a combination thereof.

[0011] According to an embodiment of the first aspect of the present application, the pigment filler is selected from fumed silica, nano calcium carbonate, heavy calcium carbonate, modified heavy calcium carbonate, nano clay, carbon black, modified clay or a combination thereof.

[0012] According to an embodiment of the first aspect of the present application, the modified epoxy resin includes a structure shown in formula (3):

[0013]

[0014] In formula (3), n is an integer of 1 to 25, R1 is a straight chain alkylene group or a branched chain alkylene group having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3; R4 includes a group of the following structural formula:

[0015]

[0016] In formula (4), X is an integer of 1 to 3, R5 is H, R6 is a C3 or C7 alkylene oxide, R7 is H or methyl, It indicates the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0017] According to an embodiment of the first aspect of the present application, the latent curing agent is selected from aldimines, ketimines, oxazolidines or a combination thereof.

[0018] 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.

[0019] According to an embodiment of the first aspect of the present application, the dehydrating agent is selected from vinyltrimethoxysilane, vinyltriacetoxysilane, vinyltriethoxysilane or a combination thereof.

[0020] According to an embodiment of the first aspect of the present application, the accelerator is selected from triacetoxyethylsilane, vinyltriacetoxysilane, diethyldiacetoxysilane or a combination thereof.

[0021] According to an embodiment of the first aspect of the present application, the catalyst is selected from dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, a chelated tin catalyst or a combination thereof.

[0022] According to the embodiment of the first aspect of the present application, the chelated tin catalyst may be U-220H, WCAT-NS01, or SG-U303.

[0023] In the second aspect, the present application provides a method for preparing the above-mentioned silane-modified polyether waterproof coating, comprising: dispersing Wacker silane-modified polyether, silane-modified polyether, hydroxy silicone oil, epoxy active plasticizer, and pigment filler to obtain a second dispersed slurry; heating the second dispersed slurry to 100°C to 110°C, vacuuming and dehydrating to obtain a dehydrated product; cooling the dehydrated product to 0°C to 70°C, adding the above-mentioned modified epoxy resin and latent curing agent for vacuum dispersion to obtain a first modified product; cooling the first modified product to 50°C to 60°C, adding a dehydrating agent and a accelerator for vacuum dispersion to obtain a second modified product; adding a catalyst to the second modified product for vacuum dispersion to obtain a silane-modified polyether waterproof coating.

[0024] According to an embodiment 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.

[0025] 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, alkoxysilane groups, and epoxyalkyl acrylate monomer-derived segments.

[0026] The silane-modified polyether waterproof coating and its preparation method of the embodiment of the present application, cites the homemade modified epoxy resin, and the special molecular structure of the terminal epoxy group, alkoxysilane group and epoxyalkyl acrylate monomer derived chain segment contained in the modified epoxy resin can improve the adhesion and anti-peeling performance of the asphalt waterproofing membrane; at the same time, it can greatly improve the adhesion performance of the coating and the concrete base surface, especially improve the adhesion performance of the coating and the wet base surface. After the alkoxysilane group in the modified epoxy resin molecule is hydrolyzed, it can undergo condensation cross-linking reaction with the alkoxy-terminated polyether and hydroxy silicone oil, and at the same time, the adhesion is improved by the condensation reaction of the alkoxysilane group with the hydroxyl group on the base surface. The introduction of modified epoxy resin and hydroxy silicone oil improves the adhesion, water resistance, heat resistance, weather resistance and flexibility of the coating film. In addition, the epoxy group in the modified epoxy resin molecule and the epoxy group in the epoxy active plasticizer further realize cross-linking reaction with the latent curing agent after hydrolysis, giving full play to the excellent adhesion characteristics of the epoxy resin, so that there are no free plasticizer molecules after the coating is cured, and the migration of the plasticizer is prevented. Furthermore, the silane-modified polyether waterproof coating of the embodiment of the present application does not generate bubbles during the curing process, thereby effectively reducing the impact of construction temperature and humidity on the coating. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with 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 the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0029] In order to solve the problems of the prior art, the embodiments of the present application provide a silane-modified polyether waterproof coating and a preparation method thereof.

[0030] The following first introduces the silane-modified polyether waterproof coating provided in the embodiments of the present application.

[0031] In the first aspect, the embodiments of the present application provide a silane-modified polyether waterproof coating, comprising the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether; 62 to 95 parts by weight of alkoxy-terminated polyether; 40 to 80 parts by weight of hydroxy silicone oil; 230 to 350 parts by weight of epoxy reactive plasticizer; 400 to 720 parts by weight of pigments and fillers; 12 to 18 parts by weight of modified epoxy resin; modified epoxy resin containing terminal epoxy groups, alkoxysilane groups and epoxyalkyl acrylate monomer derived segments; latent curing agent, 4 to 21 parts by weight; dehydrating agent, 6 to 11 parts by weight; accelerator, 1 to 3 parts by weight; catalyst, 1 to 2.5 parts by weight.

[0032] The silane-modified polyether waterproof coating of the embodiment of the present application uses a self-made modified epoxy resin. The special molecular structure of the terminal epoxy group, alkoxysilane group and epoxyalkyl acrylate monomer derived chain segment contained in the modified epoxy resin can improve the adhesion and anti-peeling performance of the waterproof roll, and at the same time can greatly improve the adhesion performance with the concrete base, especially the wet base. After the alkoxysilane group in the modified epoxy resin molecule is hydrolyzed, it can undergo condensation cross-linking reaction with the alkoxy-terminated polyether and hydroxy silicone oil, and at the same time, the adhesion is improved by the condensation reaction with the hydroxyl group on the concrete base. The introduction of the modified epoxy resin and hydroxy silicone oil improves the adhesion, water resistance, heat resistance, weather resistance and flexibility of the coating film. In addition, the epoxy group in the modified epoxy resin molecule and the epoxy group in the epoxy active plasticizer further cross-link with the latent curing agent after hydrolysis, giving full play to the excellent adhesion of the epoxy resin. After curing, there are no free plasticizer molecules, which prevents the migration of the plasticizer, and thus prevents the compatibility problem of the waterproof roll caused by its migration. Furthermore, the silane-modified polyether waterproof coating of the embodiment of the present application does not generate bubbles during the curing process, thereby effectively reducing the influence of the coating construction temperature and humidity on the coating.

[0033] In an embodiment of the present application, the molecular chain skeleton of the modified epoxy resin has terminal epoxy groups, alkoxysilane groups, and epoxyalkyl acrylate monomer derived segments. In each mole of the modified epoxy resin, since the amount of the urea-based silane coupling agent is equal to or slightly greater than the amount of the bisphenol A epoxy resin added, the content of the corresponding alkoxysilane group is equal to or slightly greater than the content of the modified epoxy resin, which may contain 1 mol to 3 mol of siloxane groups, that is, the substituents in the alkoxysilane group may be 1 or 2 or 3 siloxane groups. Exemplarily, the content of siloxane groups in each mole of the modified epoxy resin may be 1.2 mol, 1.4 mol, 1.5 mol, 1.6 mol, 1.8 mol, 2.0 mol, 2.2 mol, 2.4 mol, 2.5 mol, 2.7 mol, 2.8 mol, 2.9 mol, 3.0 mol.

[0034] In some embodiments of the present application, the epoxy equivalent of the modified epoxy resin is 260g / mol to 430g / mol. The modified epoxy resin of the present application has a suitable epoxy equivalent range, especially the modified epoxy resin within the above epoxy equivalent range is not only highly active, fast crosslinking speed, high crosslinking density, can improve the peeling strength and bonding 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 of the modified epoxy resin is 264g / mol, 274g / mol, 300g / mol, 318g / mol, 350g / mol, 380g / mol, 390g / mol, 400g / mol, 407g / mol, 420g / mol, 430g / mol.

[0035] In some embodiments of the present application, the Wacker alkoxy-terminated polyether is selected from STP-E35, STP-E30, STP-E15, STP-E10 or a combination thereof.

[0036] In some embodiments of the present application, the potassium alkoxy terminated polyether is selected from SAX227, SAX327, SAX220, SAX750 or a combination thereof.

[0037] In the embodiments of the present application, Wacker silane-modified polyether and Kaneka silane-modified polyether have meanings known in the art. Wacker silane-modified polyether may refer to a silane-modified polyether produced by Wacker Group (Wacker) or a silane-modified polyether produced according to Wacker's production process. Kaneka silane-modified polyether may refer to a silane-modified polyether produced by Kaneka Chemical Industry (Kaneka, Kaneka) Co., Ltd. or a silane-modified polyether produced according to Kaneka's production process. Kaneka silane-modified polyethers are generally prepared by grafting a silane compound containing a hydrolyzable siloxane group to both ends of a polyether having difunctionality through a specific chemical reaction.

[0038] In some embodiments of the present application, the hydroxy silicone oil is selected from hydroxyl-terminated polydimethylsiloxane with a viscosity of 350 cs to 750 cs or a combination thereof.

[0039] Exemplarily, the hydroxy silicone oil is selected from hydroxyl-terminated polydimethylsiloxane with a viscosity of 350cs, 400cs, 420cs, 450cs, 500cs, 550cs, 600cs, 630cs, 660cs, 700cs, 720cs or a combination thereof. In other embodiments, the hydroxy silicone oil can be selected from hydroxyl-terminated polydimethylsiloxane with a viscosity of 360cs to 480cs, 450cs to 560cs, 490cs to 640cs, 540cs to 750cs.

[0040] In the embodiments of the present application, the hydroxyl groups in the hydroxy silicone oil can undergo condensation crosslinking reaction with the hydrolyzed groups of the alkoxysilane groups in the modified epoxy resin, thereby improving the adhesion of the coating.

[0041] In some embodiments of the present application, the active plasticizer is selected from epoxidized soybean oil, epoxidized linseed oil, epoxidized cottonseed oil, epoxidized rice bran oil, epoxidized sunflower oil or a combination thereof.

[0042] In the embodiments of the present application, epoxy vegetable oil utilizes the excellent adhesion of epoxy resin and can undergo a cross-linking reaction with the hydrolyzed latent curing agent through the epoxy groups in its molecules, so that there are no free plasticizer molecules after the coating is cured, thereby preventing the migration of plasticizers and further preventing compatibility problems with asphalt waterproofing membranes.

[0043] In some embodiments of the present application, the pigment filler is selected from fumed silica, nano calcium carbonate, heavy calcium carbonate, modified heavy calcium carbonate, nano clay, carbon black, modified clay or a combination thereof.

[0044] In the embodiments of the present application, the macromolecules generated by the reaction of modified epoxy resin, hydroxy silicone oil, epoxy reactive diluent, Wacker alkoxy-terminated polyether and potassium-terminated alkoxy-terminated polyether are physically entangled with each other, which can enhance the flexibility of the coating film, and can further enhance the heat resistance and weather resistance of the coating film in combination with pigments and fillers.

[0045] In some embodiments of the present application, the modified epoxy resin includes a structure shown in formula (3):

[0046]

[0047] In formula (3), n is an integer of 1 to 25, R1 is a straight chain alkylene group or a branched chain alkylene group having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3; R4 includes a group of the following structural formula:

[0048]

[0049] In formula (4), X is an integer of 1 to 3, R5 is H, R6 is a C3 or C7 alkylene oxide, R7 is H or methyl, It indicates the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0050] In the embodiments of the present application, m1 represents the number of alkyl groups, m2 represents the number of alkoxy groups, and m1+m2=3 indicates that at least one alkoxy group is connected to the silicon atom to which R1 is connected.

[0051] In some embodiments of the present application, in the modified epoxy resin represented by formula (3), n is an integer of 1 to 2, R1 is a propylene group, R2 is a methyl group, and R3 is a methyl group or an ethyl group.

[0052] In some embodiments of the present application, in formula (4), R4 is a structure shown in any one of formulas (4-a) to (4-d):

[0053]

[0054]

[0055] In formula (4-a) to formula (4-d), R5 is H, X is an integer of 1 to 3, It indicates the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0056] In the embodiment of the present application, the modified epoxy resin is prepared by the following preparation steps: bisphenol A epoxy resin and urea silane coupling agent are mixed and reacted to prepare reactant A; wherein the reaction formula (1) for preparing the modified epoxy resin by reacting bisphenol A epoxy resin and urea silane coupling agent is:

[0057]

[0058] In reaction formula (1), n ​​is an integer of 1 to 25, R1 is a straight chain alkylene group or a branched chain alkylene group having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3;

[0059] Under the protection of inert gas, an epoxyalkyl acrylate monomer and an initiator are added to reactant A to prepare a modified epoxy resin; wherein the reaction formula of reactant A and epoxyalkyl acrylate monomer to prepare the modified epoxy resin is:

[0060]

[0061]

[0062] In reaction formula (2), n is an integer of 1 to 25, X is an integer of 1 to 3; R1 is a straight chain alkylene or branched chain alkylene having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3; R6 is a C3 or C7 alkylene oxide group, R7 is H or methyl, and R4 includes a group having the following structural formula:

[0063]

[0064] In formula (4), X is an integer of 1 to 3, R5 is H, R6 is a C3 or C7 alkylene oxide, R7 is H or methyl, It indicates the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0065] 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, alkoxysilane groups and epoxyalkyl acrylate monomer derived segments. Among them, the alkoxysilane group can undergo condensation cross-linking reaction with alkoxy-terminated polyether and hydroxy silicone oil after hydrolysis, and at the same time, the adhesion of the coating is improved by the condensation reaction of the alkoxysilane group with the hydroxyl group on the 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 improving 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 and hydroxy silicone oil can undergo cross-linking reaction to generate long molecular chains, thereby 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 alkyl acrylate monomer derived chain segments, and the epoxy groups in the epoxy reactive plasticizer further achieve cross-linking reaction with the hydrolyzed latent curing agent, which not only enhances the adhesion performance of the coating and the physical properties of the coating film, but also retains the plasticizer molecules in the coating film structure and no longer migrates, thereby solving the problem of plasticizer migration and the compatibility problem of asphalt waterproofing membrane caused by it.

[0066] In some embodiments of the present application, during the preparation of the modified epoxy resin, bisphenol A epoxy resin, urea silane coupling agent and epoxy alkyl acrylate monomer are added in a molar ratio of 1: (1-1.05): (1-3).

[0067] 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. At least the bisphenol A epoxy resin of the above type purchased from Baling Petrochemical can be selected. Bisphenol A epoxy resin has high strength and bonding performance, as well as good chemical resistance, and can improve the bonding performance, anti-peeling performance and weather resistance of the coating.

[0068] 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.

[0069] In some embodiments of the present application, the initiator is selected from dibenzoyl peroxide (BPO), tert-butyl perbenzoate (TBPB), benzoyl peroxide, tert-amyl peroxy-2-ethylhexyl ester, 1,1-bis(tert-amylperoxy)cyclohexane, or a combination thereof.

[0070] In some embodiments of the present application, the epoxyalkyl acrylate monomer is selected from 2,3-epoxypropyl acrylate, glycidyl methacrylate, 3,4-epoxycyclohexyl methyl methacrylate, 3,4-epoxycyclohexyl methacrylate or a combination thereof.

[0071] In some embodiments of the present application, the molar ratio of reactant A and 2,3-epoxypropyl acrylate, reactant A and glycidyl methacrylate, or reactant A and 3,4-epoxycyclohexyl methyl methacrylate, reactant A and 3,4-epoxycyclohexyl methacrylate, or reactant A and glycidyl methacrylate and 3,4-epoxycyclohexyl methyl methacrylate can be 1: (1-3). Exemplarily, the molar ratio of reactant A and epoxyalkyl acrylate monomer 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.

[0072] In some embodiments of the present application, the inert gas is selected from helium, nitrogen, argon or a combination thereof.

[0073] As an example, the preparation method of the modified epoxy resin includes:

[0074] S1. Put the calculated amount of dried bisphenol A epoxy resin E44 into a reactor, add a mixed solvent of n-butanol and N,N-dimethylformamide in a volume ratio of 1:1, the amount of the mixed solvent is 10wt.% to 15wt.% of the total mass of the reaction, start stirring until the bisphenol A epoxy resin E44 is completely dissolved, control the temperature of the feed liquid to 45°C to 50°C, and prepare a dispersion of bisphenol A epoxy resin E44;

[0075] S2, adding a calculated amount of urea-based silane coupling agent to the dispersion of bisphenol A epoxy resin E44 in the reactor, and reacting at a constant temperature for 2 to 3 hours under a nitrogen protective atmosphere to obtain a reactant A;

[0076] S3, continue to stir reactant A under nitrogen protection, make reactant A material temperature 80 ℃ ~ 85 ℃; then add calculated amount of glycidyl methacrylate and benzoyl peroxide to reactant A in the reactor, the amount of benzoyl peroxide added is 0.3wt.% ~ 0.5wt.% of the total mass of the reaction; continue to stir and raise the temperature to 90 ℃ ~ 95 ℃, constant temperature reaction for 6 hours ~ 7 hours; then evacuate the product, reduce pressure distillation for 0.5 hours ~ 1 hour, to obtain modified epoxy resin. Wherein, bisphenol A type epoxy resin E44, urea silane coupling agent and glycidyl methacrylate are added in a molar ratio of 1: (1 ~ 1.05): (1 ~ 3).

[0077] The synthetic route of the modified epoxy resin in the example is shown in the following reaction formulas (1) to (2). Reaction formula (1):

[0078]

[0079] Reaction structure (2):

[0080]

[0081]

[0082] In the above reaction formulas (1) to (2), n is an integer of 1 to 25, X is an integer of 1 to 3; R1 is a straight chain or branched chain alkyl group having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3; R4 includes a group having the following structural formula:

[0083]

[0084] In formula (4-b), X is an integer of 1 to 3, R5 is H, It indicates the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

[0085] It can be understood that similar reactions can occur by replacing glycidyl methacrylate with 3,4-epoxycyclohexylmethyl methacrylate or 2,3-epoxypropyl acrylate or 3,4-epoxycyclohexyl methacrylate, or with glycidyl methacrylate and 3,4-epoxycyclohexylmethyl methacrylate, or with glycidyl methacrylate and 2,3-epoxypropyl acrylate, or with 3,4-epoxycyclohexylmethyl methacrylate and 2,3-epoxypropyl acrylate.

[0086] In some embodiments of the present application, the latent curing agent is selected from aldimines, ketimines, oxazolidines or a combination thereof.

[0087] In some embodiments of the present application, the latent curing agent is selected from XY-401, YRLH-1106, JW505 or a combination thereof.

[0088] In some embodiments of the present application, the water scavenger is selected from vinyl trimethoxy silane, vinyl triacetoxy silane, vinyl triethoxy silane or a combination thereof.

[0089] In some embodiments of the present application, the accelerator is selected from triacetoxyethylsilane, vinyltriacetoxysilane, diethyldiacetoxysilane or a combination thereof.

[0090] In some embodiments of the present application, the catalyst is selected from dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, a chelated tin catalyst or a combination thereof.

[0091] In some embodiments of the present application, the chelated tin catalyst may be U-220H, WCAT-NS01, or SG-U303.

[0092] In the second aspect, the present application provides a method for preparing the above-mentioned silane-modified polyether waterproof coating, comprising: dispersing Wacker silane-modified polyether, silane-modified polyether, hydroxy silicone oil, epoxy active plasticizer, and pigment filler to obtain a second dispersed slurry; heating the second dispersed slurry to 100°C to 110°C, vacuuming and dehydrating to obtain a dehydrated product; cooling the dehydrated product to 0°C to 70°C, adding modified epoxy resin and latent curing agent for vacuum dispersion to obtain a first modified product; cooling the first modified product to 50°C to 60°C, adding a dehydrating agent and a accelerator for vacuum dispersion to obtain a second modified product; adding a catalyst to the second modified product for vacuum dispersion to obtain a silane-modified polyether waterproof coating.

[0093] The preparation method of the silane-modified polyether waterproof coating of the embodiment of the present application is to first disperse the Wacker silane-modified polyether, the silane-modified polyether, the hydroxy silicone oil, the epoxy active plasticizer and the pigment filler to obtain a second dispersed slurry in which each substance is evenly dispersed, and then introduce a latent curing agent and a homemade modified epoxy resin, and utilize the special molecular structure in the modified epoxy resin to improve the adhesion and anti-peeling performance of the waterproof coiled material. Among them, after the alkoxysilane group in the modified epoxy resin molecule is hydrolyzed, it can undergo a condensation cross-linking reaction with the alkoxy-terminated polyether and the hydroxy silicone oil. The introduction of the modified epoxy resin and the hydroxy silicone oil 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 of the alkoxysilane group with the hydroxyl group on the base surface, which can greatly improve the adhesion performance with the concrete base surface, especially the wet base surface.

[0094] In addition, the epoxy groups in the modified epoxy resin molecules and the epoxy groups in the epoxy plasticizer further cross-link with the latent curing agent after hydrolysis to give full play to the excellent adhesiveness of the epoxy resin. After curing, there are no free plasticizer molecules to prevent plasticizer migration, thereby preventing the plasticizer migration from causing compatibility problems with waterproof membranes. The silane-modified polyether waterproof coating of the embodiment of the present application does not generate bubbles during the curing process and is almost unaffected by the construction temperature and humidity.

[0095] In some embodiments of the present application, the method for preparing 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.

[0096] In some embodiments of the present application, dispersing Wacker silane-modified polyether, kalium-modified silane-modified polyether, hydroxyl silicone oil, epoxy reactive plasticizer, and pigments and fillers includes: dispersing Wacker silane-modified polyether, kalium-modified silane-modified polyether, hydroxyl silicone oil, and epoxy reactive plasticizer to obtain a first dispersed slurry; heating the first dispersed slurry to 90° C. to 100° C. and adding pigments and fillers for dispersion to obtain a second dispersed slurry.

[0097] Exemplarily, the preparation method of the silane-modified polyether waterproof coating includes: adding Wacker silane-modified polyether, silane-modified polyether, hydroxy silicone oil, and active plasticizer into a reactor for dispersion treatment to obtain a first dispersed slurry; heating the first dispersed slurry to 90° C. to 100° C. and adding pigments and fillers for dispersion treatment to obtain a second dispersed slurry; heating the second dispersed slurry to 100° C. to 110° C., vacuuming and dehydrating for 3 to 4 hours to obtain a dehydrated product; cooling the dehydrated product to 60° C. to 40° C. 70°C, add modified epoxy resin and latent curing agent for vacuum dispersion treatment for 0.5 hour to 1 hour to obtain a first modified product; cool the first modified product to 50°C to 60°C, add desiccant and accelerator for vacuum dispersion treatment for 0.5 hour to 1 hour to obtain a second modified product; add catalyst to the second modified product for vacuum dispersion treatment for 0.5 hour to 1 hour, cool the product to ≤50°C, fill with nitrogen for protection, and obtain a silane-modified polyether waterproof coating.

[0098] In a third aspect, an embodiment of the present application provides a use of the above-mentioned modified epoxy resin for preparing a silane-modified polyether waterproof coating, wherein the modified epoxy resin contains the above-mentioned terminal epoxy group, alkoxysilane group and epoxyalkyl acrylate monomer derived chain segment.

[0099] Test Section

[0100] The following are the models / brands of some raw material components used in the examples and comparative examples and their available sources. The raw material components not mentioned in the examples or comparative examples can be obtained through commercial channels: bisphenol A epoxy resin E44, purchased from Baling Petrochemical; Wacker silane-modified polyether: STP-E35, purchased from Wacker Chemical (China) Co., Ltd.; Zhonghua silane-modified polyether: SAX750, purchased from Zhonghua Trading (Shanghai) Co., Ltd.; catalyst: chelated tin SG-U303, purchased from Guangzhou Jianyi Chemical Import and Export Co., Ltd.; aldimine type latent curing agent XY-401, purchased from Suzhou Xiangyuan New Materials Co., Ltd.; dewatering agent, vinyl trimethoxy silane; accelerator, triethoxyethyl silane; urea silane coupling agent, γ-urea propyl trimethoxy silane.

[0101] Preparation of modified epoxy resin

[0102] Preparation Example 1

[0103] The preparation method of modified epoxy resin 1 comprises:

[0104] S1. Add the calculated amount of dried bisphenol A epoxy resin E44 into a reactor, add a mixed solvent of n-butanol and N,N-dimethylformamide in a volume ratio of 1:1, and the amount of the mixed solvent is 12wt.% 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 feed liquid to 45°C to 50°C to obtain a dispersion of bisphenol A epoxy resin E44;

[0105] S2, adding a calculated amount of urea-based silane coupling agent to the dispersion of bisphenol A epoxy resin E44 in the reactor, and reacting at a constant temperature for 3 hours under a nitrogen protective atmosphere to obtain a reactant A;

[0106] S3, continue to stir reactant A under nitrogen protection, make reactant A material temperature 80 ℃ ~ 85 ℃; add calculated amount of glycidyl methacrylate and benzoyl peroxide to reactant A in the reactor, the amount of benzoyl peroxide added is 0.3wt.% of the total mass of the reaction; continue to stir and raise the temperature to 90 ℃ ~ 95 ℃, constant temperature reaction for 6 hours; then evacuate the product, reduce pressure distillation for 1 hour, and obtain modified epoxy resin 1. Among them, bisphenol A type epoxy resin E44, urea silane coupling agent and glycidyl methacrylate are added in a molar ratio of 1:1.02:1, and the epoxy equivalent of modified epoxy resin 1 is 407g / mol.

[0107] Preparation Example 2

[0108] The preparation method of modified epoxy resin 2 is different from that of Preparation Example 1 only in that bisphenol A epoxy resin E44, urea-based silane coupling agent and glycidyl methacrylate are added in a molar ratio of 1:1.02:2, and the epoxy equivalent of the modified epoxy resin is 318 g / mol.

[0109] Preparation Example 3

[0110] The preparation method of modified epoxy resin 3 is different from that of Preparation Example 1 only in that bisphenol A epoxy resin E44, urea-based silane coupling agent and glycidyl methacrylate are added in a molar ratio of 1:1.02:3, and the epoxy equivalent of the modified epoxy resin is 274 g / mol.

[0111] Preparation Example 4

[0112] The preparation method of modified epoxy resin 4 comprises:

[0113] S1. Add the calculated amount of dried bisphenol A epoxy resin E44 into a reactor, add a mixed solvent of n-butanol and N,N-dimethylformamide in a volume ratio of 1:1, and the amount of the mixed solvent is 12wt.% 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 feed liquid to 45°C to 50°C to obtain a dispersion of bisphenol A epoxy resin E44;

[0114] S2. According to the molar ratio of bisphenol A epoxy resin E44 to urea-based silane coupling agent of 1:1.02, a calculated amount of urea-based silane coupling agent was added dropwise to the dispersion of bisphenol A epoxy resin E44 in the reactor, and the mixture was reacted at a constant temperature for 3 hours under a nitrogen protective atmosphere to obtain modified epoxy resin 4. The epoxy equivalent of modified epoxy resin 4 was 672 g / mol.

[0115] Preparation Example 5

[0116] The preparation method of modified epoxy resin 5 comprises:

[0117] S1. Add the calculated amount of dried bisphenol A epoxy resin E44 into a reactor, add a mixed solvent of n-butanol and N,N-dimethylformamide in a volume ratio of 1:1, and the amount of the mixed solvent is 12wt.% 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 feed liquid to 45°C to 50°C to obtain a dispersion of bisphenol A epoxy resin E44;

[0118] S2. Continue stirring the bisphenol A epoxy resin E44 under nitrogen protection to make the material temperature of the bisphenol A epoxy resin E44 80°C to 85°C; then add a calculated amount of glycidyl methacrylate and benzoyl peroxide to the dispersion of the bisphenol A epoxy resin E44 in the reactor according to a molar ratio of 1:1 between the bisphenol A epoxy resin E44 and glycidyl methacrylate, the amount of benzoyl peroxide added being 0.3wt% of the total mass of the reaction, continue stirring, increase the temperature to 90°C to 95°C, and react at a constant temperature for 6 hours; then evacuate the product and perform reduced pressure distillation for 1 hour to obtain a modified epoxy resin 5, the epoxy equivalent of the modified epoxy resin 5 being 197g / mol.

[0119] Example 1

[0120] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 64 parts by weight of K-type alkoxy-terminated polyether SAX750; 52 parts by weight of hydroxyl silicone oil, 280 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 13 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silane groups and epoxy acrylate monomer derived segments; 18 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehydrating agent; 2 parts by weight of triacetoxyethyl silane as an accelerator; and 1.6 parts by weight of chelated tin catalyst SG-U303.

[0121] The preparation method of the silane-modified polyether waterproof coating of the present embodiment includes: dispersing Wacker silane-modified polyether STP-E35, silane-modified polyether SAX750, hydroxy silicone oil hydroxyl-terminated polydimethylsiloxane, and active plasticizer epoxy soybean oil to obtain a first dispersed slurry; heating the first dispersed slurry to 90° C. to 100° C. and adding heavy calcium and nano calcium carbonate as pigments and fillers to disperse the first dispersed slurry to obtain a second dispersed slurry; heating the second dispersed slurry to 100° C. to 110° C. and vacuuming to perform dehydration for 3 hours to obtain a dehydrated product; cooling the dehydrated product to 60° C. to 70° C. , add modified epoxy resin and aldimine type latent curing agent XY-401 for vacuum dispersion treatment for 0.5 hour to obtain a first modified product; cool the first modified product to 50°C ~ 60°C, add vinyltrimethoxysilane as a dehydrating agent and triacetoxyethylsilane as a promoter for vacuum dispersion treatment for 0.5 hour to obtain a second modified product; add chelated tin catalyst SG-U303 to the second modified product for vacuum dispersion treatment for 0.5 hour ~ 1 hour, cool the product to 48°C, fill with nitrogen for protection, and obtain a silane-modified polyether waterproof coating.

[0122] Example 2

[0123] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 64 parts by weight of K-type alkoxy-terminated polyether SAX750; 52 parts by weight of hydroxyl silicone oil, 300 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 13 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silane groups and epoxy acrylate monomer derived segments; 18 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehumidifier; 2 parts by weight of triacetoxyethyl silane as an accelerator; and 1.6 parts by weight of chelated tin catalyst SG-U303. The preparation method of the silane-modified polyether waterproof coating of this embodiment is the same as that of Example 1.

[0124] Example 3

[0125] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 79 parts by weight of K-type alkoxy-terminated polyether SAX750; 62 parts by weight of hydroxyl silicone oil hydroxyl-terminated polydimethylsiloxane (750cs); 270 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 15 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silane groups and epoxy acrylate monomer derived segments; 12 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehydrating agent; 2.5 parts by weight of triacetoxyethyl silane as an accelerator; and 1.2 parts by weight of chelated tin catalyst SG-U303. The preparation method of the silane-modified polyether waterproof coating of this embodiment is the same as that of Example 1.

[0126] Example 4

[0127] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 64 parts by weight of K-type alkoxy-terminated polyether SAX750; 52 parts by weight of hydroxyl silicone oil, 280 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 15 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silyloxy groups and epoxy acrylate monomer derived segments; 18 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehumidifier; 2 parts by weight of triacetoxyethyl silane as an accelerator; and 1.6 parts by weight of chelated tin catalyst SG-U303. The preparation method of the silane-modified polyether waterproof coating of this embodiment is the same as that of Example 1.

[0128] Example 5

[0129] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 64 parts by weight of K-type alkoxy-terminated polyether SAX750; 52 parts by weight of hydroxyl silicone oil hydroxyl-terminated polydimethylsiloxane (750cs); 280 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 17 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silane groups and epoxy acrylate monomer derived segments; 18 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehydrating agent; 2 parts by weight of triacetoxyethyl silane as an accelerator; and 1.6 parts by weight of chelated tin catalyst SG-U303. The preparation method of the silane-modified polyether waterproof coating of this embodiment is the same as that of Example 1.

[0130] Example 6

[0131] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 64 parts by weight of K-type alkoxy-terminated polyether SAX750; 52 parts by weight of hydroxyl silicone oil hydroxyl-terminated polydimethylsiloxane (750cs); 280 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 2,13 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silane groups and epoxy acrylate monomer derived segments; 18 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehydrating agent; 2 parts by weight of triacetoxyethyl silane as an accelerator; and 1.6 parts by weight of chelated tin catalyst SG-U303. The preparation method of the silane-modified polyether waterproof coating of this embodiment is the same as that of Example 1.

[0132] Example 7

[0133] A silane-modified polyether waterproof coating comprises the following components calculated by weight: 100 parts by weight of Wacker alkoxy-terminated polyether STP-E35; 64 parts by weight of K-type alkoxy-terminated polyether SAX750; 52 parts by weight of hydroxyl silicone oil, 280 parts by weight of epoxy soybean oil as an active plasticizer; 590 parts by weight of pigments and fillers, including 360 parts by weight of heavy calcium and 230 parts by weight of nano calcium carbonate; 3,13 parts by weight of modified epoxy resin; the modified epoxy resin contains terminal epoxy groups, terminal silane groups and epoxy acrylate monomer derived segments; 18 parts by weight of aldimine latent curing agent XY-401; 7 parts by weight of vinyl trimethoxy silane as a dehydrating agent; 2 parts by weight of triacetoxyethyl silane as an accelerator; and 1.6 parts by weight of chelated tin catalyst SG-U303. The preparation method of the silane-modified polyether waterproof coating of this embodiment is the same as that of Example 1.

[0134] Comparative Example 1

[0135] A silane-modified polyether waterproof coating, the composition and preparation process of which are different from those of Example 1 in that the hydroxyl-terminated polydimethylsiloxane (750cs) in Example 1 is not included, and the same weight proportion of epoxy soybean oil is used instead.

[0136] Comparative Example 2

[0137] A silane-modified polyether waterproof coating, the composition and preparation process of which are different from those of Example 1 in that the epoxy soybean oil in Example 1 is not included, and the same weight proportion of common plasticizer dibutyl phthalate is used instead.

[0138] Comparative Example 3

[0139] A silane-modified polyether waterproof coating, the composition and preparation process of which are different from those of Example 1 in that the modified epoxy resin in Example 1 is not included, and an aldimine-type latent curing agent of the same weight proportion is used instead.

[0140] Comparative Example 4

[0141] A silane-modified polyether waterproof coating, the composition and preparation process of which are different from those of Example 1 in that the hydroxyl-terminated polydimethylsiloxane (750cs) and modified epoxy resin in Example 1 are not included, and the same weight portions of epoxy soybean oil and aldimine-type latent curing agent are used instead.

[0142] Comparative Example 5

[0143] A silane-modified polyether waterproof coating, the composition and preparation process of which are different from those of Example 1 in that: the modified epoxy resin 1 in Example 1 is replaced by a modified epoxy resin 4.

[0144] Comparative Example 6

[0145] A silane-modified polyether waterproof coating, the composition and preparation process of which are different from those of Example 1 in that: the modified epoxy resin 1 in Example 1 is replaced by a modified epoxy resin 5.

[0146] Performance Testing

[0147] The performance of the silane-modified polyether waterproof coatings prepared in Examples 1-7 and Comparative Examples 1-6 was tested, and the test method was as follows:

[0148] 1. Test Method

[0149] 1. Performance test of silane-modified polyether waterproof coating film

[0150] The performance test of silane-modified polyether waterproof coating film is carried out in accordance with JC / T2435-2018.

[0151] 2. Test method for peel strength of asphalt waterproof membrane

[0152] The silane-modified polyether waterproof coatings prepared in Examples 1-7 and Comparative Examples 1-6 were laminated with asphalt waterproofing membranes (Keshun APF-3000) with isolation membranes, and their 180° peel strength was tested after lamination. Specifically, the following steps were performed:

[0153] (1) Preparation of test pieces

[0154] The silane-modified polyether waterproof coatings prepared in Examples 1-7 and Comparative Examples 1-6 were respectively coated on a concrete base surface with a specification of 400mm*200mm*40mm by cold construction, and the coating thickness was 1.5±0.2mm; after coating, the isolation film of the asphalt waterproof membrane was torn off and laid on the coating layer during the adaptation period of the coating, and the asphalt waterproof membrane and the silane-modified polyether waterproof coating were compacted and fully adhered to make the asphalt waterproof membrane and the silane-modified polyether waterproof coating in a fully adhered state. After curing for 168 hours, the asphalt waterproof membrane was cut to obtain a test piece, and the preset size of the bonding surface was kept at 70*50mm; the peel strength of the test piece at 180° was measured.

[0155] (2) Test method

[0156] The cement mortar block surface in the test pieces corresponding to Examples 1-7 and Comparative Examples 1-6 is mounted in the fixture at one end of the electronic tensile testing machine, and the unbonded surface of the cut asphalt waterproofing membrane in the test piece opposite to the bonding surface is bent 180° and clamped in the fixture at the other end of the electronic tensile testing machine. Pay attention to accurately positioning the test piece of the chuck to ensure that the applied tension is evenly distributed over the width of the test piece. Start the testing equipment and set the tensile speed to 100mm / min.

[0157] 3. Wet base surface bonding strength test

[0158] The bonding strength test of silane-modified polyether waterproof coating on wet substrate was carried out in accordance with GB / T16777-2008.

[0159] The test results of the above performance test are recorded in the following Table 1:

[0160]

[0161] In Table 1, the cohesive failure of the coating layer indicates that the interfacial adhesion between the coating layer and the coiled material is greater than the cohesive strength of the coating layer material itself, and the interfacial failure indicates that the interfacial adhesion between the coating layer and the coiled material is less than the cohesive strength of the coating layer material itself.

[0162] From the component ratios of the silane-modified polyether waterproof coatings of Examples 1-7 and Comparative Examples 1-6 and the test results in Table 1, it can be seen that:

[0163] The silane-modified polyether waterproof coatings in Examples 1 to 3 are more excellent in terms of bonding strength, bonding strength on wet base surfaces, composite peeling strength with asphalt waterproof roll materials, peeling failure forms, etc.; the bonding performance and composite peeling strength of the silane-modified polyether waterproof coatings in Comparative Examples 1 to 6 are significantly lower than those of the silane-modified polyether waterproof coatings in Examples 1 to 3.

[0164] From the test data of the composite peel strength (N / mm) of the silane-modified polyether waterproof coating and the coiled material of Examples 1-3 and Comparative Examples 1-6, it can be clearly seen that the composite peeling of the silane-modified polyether waterproof coating and the coiled material of Examples 1-3 was 100% cohesive failure of the coating layer, and that the composite peeling of the silane-modified polyether waterproof coating and the coiled material of Comparative Examples 1-4 was only 55% to 70% cohesive failure of the coating layer and the rest were interfacial failures. The use of hydroxy-terminated polydimethylsiloxane, epoxy plasticizer and modified epoxy resin in Examples 1-3 improves the bonding performance of the silane-modified polyether waterproof coating to the asphalt waterproof coiled material, and also improves the bonding performance to the substrate, especially the wet substrate.

[0165] It can be seen from Examples 1, 6 and 7 that as the molar ratio of bisphenol A epoxy resin and urea-based silane coupling agent in the modified epoxy resin increases, the epoxy equivalent value of the modified epoxy resin gradually decreases, the tensile properties of the silane-modified polyether waterproof coating, especially the bonding properties, gradually improve, and the peel strength of the composite with the coiled material also gradually improves. It can be seen from Examples 1, 4 and 5 that increasing the amount of modified epoxy resin will cause the elongation of the silane-modified polyether waterproof coating film to decrease significantly, but it can be seen that the bonding properties and the composite peeling properties with the coiled material are significantly improved.

[0166] The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A silane-modified polyether waterproof coating, characterized in that: The composition comprises the following components calculated by weight: Wacker alkoxy-terminated polyether, 100 parts by weight; 62 to 95 parts by weight of potassium hydroxide alkoxy terminated polyether; Hydroxy silicone oil, 40-80 parts by weight; Epoxy reactive plasticizer, 230-350 parts by weight; Pigments and fillers: 400-720 parts by weight; Modified epoxy resin, 12-18 parts by weight; the modified epoxy resin contains terminal epoxy groups, alkoxysilane groups and epoxyalkyl acrylate monomer derived segments; Latent curing agent, 4 to 21 parts by weight; Dewatering agent, 6 to 11 parts by weight; Accelerator, 1 to 3 parts by weight; Catalyst, 1 to 2.5 parts by weight.

2. The silane-modified polyether waterproof coating according to claim 1, characterized in that: The modified epoxy resin comprises a structure shown in formula (3): In formula (3), n is an integer of 1 to 25; R1 is a straight chain alkylene group or a branched chain alkylene group having not less than 2 carbon atoms; R2 is a C1-C3 alkyl group; R3 is a C1-C3 straight chain or branched chain alkyl group; and m1+m2=3; R4 includes a group of the following structural formula: In formula (4), X is an integer of 1 to 3, R5 is H, R6 is a C3 or C7 alkylene oxide, R7 is H or methyl, It indicates 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 2, characterized in that: Meet any of the following requirements: In formula (3), n is an integer of 1 to 2; R1 is a propylene group, R2 is a methyl group, and R3 is a methyl group or an ethyl group; In formula (4), R4 is a structure represented by any one of formulas (4-a) to (4-d): In formulas (4-a) to (4-d), R5 is H, X is an integer of 1 to 3, It indicates the position where R4 is connected to the molecular chain backbone of the modified epoxy resin.

4. The silane-modified polyether waterproof coating according to claim 2 or 3, characterized in that: The modified epoxy resin is prepared by the following preparation steps: A bisphenol A epoxy resin and a urea-based silane coupling agent are mixed and reacted to prepare a reactant A; wherein the reaction structure (1) for preparing a modified epoxy resin by reacting the bisphenol A epoxy resin and the urea-based silane coupling agent is: In the reaction structure (1), n ​​is an integer of 1 to 25, R1 is a straight chain alkylene group or a branched chain alkylene group having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3; Under the protection of inert gas, an acrylate epoxy alkyl ester monomer and an initiator are added to the reactant a to prepare a modified epoxy resin; wherein the reaction formula (2) for preparing the modified epoxy resin from the reactant A and the acrylate epoxy alkyl ester monomer is: In the reaction structure (2), n is an integer of 1 to 25; R1 is a straight chain alkylene or branched chain alkylene having not less than 2 carbon atoms, R2 is a C1-C3 alkyl group, R3 is a C1-C3 straight chain or branched chain alkyl group, and m1+m2=3; R6 is a C3 or C7 alkylene oxide group, R7 is H or methyl, and R4 includes a group of the following structure:

5. The silane-modified polyether waterproof coating according to claim 4, 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 urea-based silane coupling agent is selected from γ-urea-based propyl trimethoxy silane, γ-urea-based propyl triethoxy silane, 3-(diisopropylurea-based propyl) triethoxy silane or a combination thereof; The initiator is selected from dibenzoyl peroxide, tert-butyl perbenzoate, benzoyl peroxide, tert-amyl peroxy-2-ethylhexyl ester, 1,1-bis(tert-amylperoxy)cyclohexane or a combination thereof; The bisphenol A epoxy resin, the urea-based silane coupling agent and the epoxyalkyl acrylate monomer are added in a molar ratio of 1: (1-1.05): (1-3); The epoxyalkyl acrylate monomer is selected from 2,3-epoxypropyl acrylate, glycidyl methacrylate, 3,4-epoxycyclohexyl methyl methacrylate, 3,4-epoxycyclohexyl methacrylate or a combination thereof.

6. The silane-modified polyether waterproof coating according to claim 1, characterized in that: Meet any 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, STP-E10 or a combination thereof; The potassium alkoxy terminated polyether is selected from SAX227, SAX327, SAX220, SAX750 or a combination thereof; The hydroxy silicone oil is selected from hydroxyl-terminated polydimethylsiloxane with a viscosity of 350cs to 750cs; The epoxy reactive plasticizer is selected from epoxidized soybean oil, epoxidized linseed oil, epoxidized cottonseed oil, epoxidized rice bran oil, epoxidized sunflower oil or a combination thereof; The pigment filler is selected from fumed silica, nano calcium carbonate, heavy calcium carbonate, modified heavy calcium carbonate, nano clay, carbon black, modified clay or a combination thereof; The latent curing agent is selected from aldimines, ketimines, oxazolidines or a combination thereof; The dewatering agent is selected from vinyl trimethoxy silane, vinyl triacetoxy silane, vinyl triethoxy silane or a combination thereof; The accelerator is selected from triacetoxyethylsilane, vinyl triacetoxysilane, diethyl diacetoxysilane or a combination thereof; The catalyst is selected from dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, chelated tin catalyst or a combination thereof.

7. The silane-modified polyether waterproof coating according to claim 6 meets any of the following requirements: 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.

8. A method for preparing the silane-modified polyether waterproof coating according to any one of claims 1 to 7, characterized in that: include: Dispersing Wacker silane-modified polyether, silane-modified polyether, hydroxy silicone oil, epoxy active plasticizer, and pigments and fillers to prepare a second dispersed slurry; The second dispersed slurry is heated to 100° C. to 110° C. and vacuumed to perform dehydration treatment to obtain a dehydrated product; The dehydrated product is cooled to 60° C. to 70° C., and a modified epoxy resin and a latent curing agent are added to perform vacuum dispersion treatment to obtain a first modified product; The first modified product is cooled to 50° C. to 60° C., a dehydrating agent and an accelerator are added to perform vacuum dispersion treatment to obtain a second modified product; A catalyst is added to the second modified product for vacuum dispersion treatment to obtain a silane-modified polyether waterproof coating.

9. The preparation method according to claim 8, characterized in that: The Wacker silane-modified polyether, the silane-modified polyether, the hydroxy silicone oil, the epoxy active plasticizer, and the pigment and filler are dispersed and treated, including: Dispersing the Wacker silane-modified polyether, the potassium silane-modified polyether, the hydroxy silicone oil, and the epoxy reactive plasticizer to obtain a first dispersed slurry; The first dispersed slurry is heated to 90° C. to 100° C. and pigments and fillers are added for dispersion treatment to obtain a second dispersed slurry.

10. A use of a modified epoxy resin for preparing a silane-modified polyether waterproof coating, wherein: The modified epoxy resin contains terminal epoxy groups, alkoxysilane groups and epoxyalkyl acrylate monomer derived chain segments.

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