Composition for waterproofing paint and waterproofing paint, and method for preparing and use thereof

Abstract

The application relates to the technical field of building waterproof coating and discloses a composition for a flame-retardant two-component polyurethane waterproof coating, the flame-retardant two-component polyurethane waterproof coating and a preparation method and application thereof, the composition contains component A and component B in a weight ratio of 1:1-5, the component A comprises a polyurethane prepolymer, the polyurethane prepolymer is prepared from a mixture containing a first main agent and a first auxiliary agent; the first main agent is polyoxyalkylene polyol and bisphenol A polyether polyol in a weight ratio of 1-6:1; the component B is composed of a second main agent and a second auxiliary agent, the second main agent is at least one of polyoxyalkylene polyols; the polyoxyalkylene polyols are selected from at least one of polypropylene oxide diol, polypropylene oxide triol and polypropylene oxide-ethylene oxide triol. The flame-retardant two-component polyurethane waterproof coating provided by the application has excellent flame-retardant effect, heat resistance and mechanical properties.

Description

Technical Field

[0001] This invention relates to the field of building waterproof coatings technology, specifically to waterproof coating compositions, waterproof coatings, their preparation methods, and applications. Background Technology

[0002] Polyurethane waterproof coatings have many advantages, such as good mechanical properties, good chemical corrosion resistance, and excellent overall waterproofing effect. They have been widely used in waterproofing and seepage prevention projects for basements, roofs, ditches, bathrooms, and chemical plant floors. However, untreated polyurethane waterproof coatings are flammable materials. When burned, they produce large flames and thick smoke, and release toxic gases such as HCN and CO, seriously threatening people's lives and property.

[0003] Currently, there are two methods for preparing flame-retardant polyurethane waterproof coatings: the additive method and the reaction method.

[0004] The additive method is a common technical route for preparing similar flame-retardant polyurethane waterproof coatings. This involves adding flame-retardant materials to the polymer through mechanical mixing. This method is simple, convenient, and inexpensive. However, to achieve the desired flame-retardant effect using the additive method, a large amount of flame-retardant filler is often added, causing cracking, powdering, or a significant decrease in the physical and mechanical properties of the coating, thus negating its inherent performance advantages.

[0005] The reaction method involves introducing flame-retardant groups (mostly phosphorus-containing polyether polyols, phosphorus-containing polyester polyols, etc.) into the molecular chain to achieve a flame-retardant effect.

[0006] For example, CN104403546A discloses a flame-retardant polyether-type single-component polyurethane waterproof coating and its preparation method. The flame-retardant polyether-type single-component polyurethane waterproof coating is made from the following raw materials: 40-50% flame-retardant polymeric polyether polyol, 20.6-26.3% liquid filler, 25-30% powder filler, 3.5-4.2% TDI and 0.2% catalyst, all percentages being by mass. The liquid filler is dinonyl phthalate, and the powder filler is calcium carbonate. The flame-retardant polyether-type single-component polyurethane waterproof coating has an oxygen index of ≥34.8%, a tensile strength of ≥2.51 MPa, and a tear strength of ≥16.21 N / mm. The advantage of this existing technology lies in introducing flame-retardant elements into polyether polyols and selecting appropriate ratios and reaction conditions, which makes the polyurethane waterproof coating have a better and longer-lasting flame-retardant effect, while also having good physical properties such as heat resistance, dimensional stability and strength. Among them, the oxygen index is above 34.8%, the tensile strength is above 2.51 MPa, and the tear strength is above 16.21 N / mm.

[0007] However, the aforementioned existing technologies cannot achieve a balance between flame retardant properties and the good mechanical properties of the coating itself. Summary of the Invention

[0008] The purpose of this invention is to overcome the problem that existing flame-retardant polyurethane waterproof coatings cannot simultaneously achieve flame-retardant performance and good mechanical properties of the coating itself.

[0009] To achieve the above objectives, a first aspect of the present invention provides a flame-retardant two-component polyurethane waterproof coating composition, wherein the composition contains component A and component B in a weight ratio of 1:1-5.

[0010] Component A includes a polyurethane prepolymer, which is prepared from a mixture containing a first main agent and a first auxiliary agent. The first main agent is a polyoxyolefin polyol and a bisphenol A polyether polyol in a weight ratio of 1-6:1, and the first auxiliary agent contains diisocyanate. The weight ratio of the first main agent to the first auxiliary agent is 1-4:1.

[0011] Component B consists of a second main agent and a second auxiliary agent, wherein the second main agent is at least one of polyoxyolefin polyols; based on the total weight of component B, the content of the polyoxyolefin polyol in component B is 5wt%-10wt%;

[0012] The polyoxyolefin polyol is selected from at least one of polyoxypropylene diol, polyoxypropylene triol, and polyoxypropylene-ethylene triol, and the number average molecular weight of the polyoxyolefin polyol is 2000-5000, the hydroxyl value is 33-60 mg KOH / g, and the functionality is 2-3.

[0013] A second aspect of the present invention provides a method for preparing a flame-retardant two-component polyurethane waterproof coating, the method comprising using the components of the composition described in the first aspect, the method comprising:

[0014] The components of component A are mixed and reacted to obtain material A, wherein the polyurethane prepolymer in component A is obtained by first contacting the components of a mixture containing a first main agent and a first auxiliary agent; and

[0015] The components in component B are brought into a second contact to obtain material B.

[0016] A third aspect of the present invention provides a flame-retardant two-component polyurethane waterproof coating prepared by the method described in the second aspect.

[0017] The fourth aspect of the present invention provides the application of the flame-retardant two-component polyurethane waterproof coating described in the third aspect in the field of building waterproof coatings.

[0018] The present invention has at least the following beneficial effects:

[0019] 1) The flame-retardant two-component polyurethane waterproof coating provided by the present invention improves the flame-retardant effect of the existing single-component polyurethane waterproof coating while avoiding the loss of material performance due to the addition of a large amount of flame-retardant materials, thus fundamentally solving the problem of balancing flame-retardant performance and good mechanical properties of the coating itself.

[0020] 2) The flame-retardant two-component polyurethane waterproof coating provided by the present invention modifies the existing single-component polyurethane waterproof coating by introducing bisphenol A polyether polyol with a benzene ring structure, thereby giving the conventional polyurethane waterproof coating excellent heat resistance and mechanical properties. Detailed Implementation

[0021] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0022] As previously described, a first aspect of the present invention provides a flame-retardant two-component polyurethane waterproof coating composition comprising component A and component B in a weight ratio of 1:1-5.

[0023] Component A includes a polyurethane prepolymer, which is prepared from a mixture containing a first main agent and a first auxiliary agent. The first main agent is a polyoxyolefin polyol and a bisphenol A polyether polyol in a weight ratio of 1-6:1, and the first auxiliary agent contains diisocyanate. The weight ratio of the first main agent to the first auxiliary agent is 1-4:1.

[0024] Component B consists of a second main agent and a second auxiliary agent, wherein the second main agent is at least one of polyoxyolefin polyols; based on the total weight of component B, the content of the polyoxyolefin polyol in component B is 5wt%-10wt%;

[0025] The polyoxyolefin polyol is selected from at least one of polyoxypropylene diol, polyoxypropylene triol, and polyoxypropylene-ethylene triol, and the number average molecular weight of the polyoxyolefin polyol is 2000-5000, the hydroxyl value is 33-60 mg KOH / g, and the functionality is 2-3.

[0026] Preferably, the polyoxyolefin polyols in component A and component B are of the same or different types.

[0027] More preferably, the polyoxyolefin polyol in component A is polyoxypropylene diol and / or polyoxypropylene triol; and the polyoxyolefin polyol in component B is polyoxypropylene triol.

[0028] Preferably, in component A, the bisphenol A polyether polyol has a number-average molecular weight of 400-1100, a hydroxyl value of 101-285 mg KOH / g, and a functionality of 2. The inventors of this invention have discovered that, under this preferred condition, the flame-retardant two-component polyurethane waterproof coating provided by this invention exhibits better flame-retardant properties.

[0029] Preferably, in component A, the diisocyanate is selected from at least one of toluene diisocyanate and diphenylmethane diisocyanate.

[0030] More preferably, in component A, the diisocyanate is toluene diisocyanate.

[0031] Preferably, based on the total weight of component A, the first auxiliary agent in component A further contains solvent I.

[0032] Preferably, in component A, the weight ratio of the diisocyanate to solvent I is 1:0.5-2.

[0033] More preferably, in component A, solvent I is selected from at least one of thylene, propylene glycol methyl ether acetate, and butyl acetate.

[0034] More preferably, in component A, solvent I is trimethylbenzene.

[0035] Preferably, in component B, the second additive contains a plasticizer, an antifoaming agent, a dispersant, pigments and fillers, a chain extender, a catalyst, and solvent II.

[0036] More preferably, based on the total weight of component B, the content of the plasticizer is 20wt%-40wt%, the content of the defoamer is 0.1wt%-0.8wt%, the content of the dispersant is 0.1wt%-0.8wt%, the content of the pigments and fillers is 40wt%-60wt%, the content of the chain extender is 2wt%-10wt%, the content of the catalyst is 0.1wt%-0.8wt%, and the content of solvent II is 2wt%-10wt%.

[0037] In a preferred embodiment, the plasticizer in component B is selected from at least one of trioctyl phosphate and chlorinated paraffin plasticizer.

[0038] In a preferred embodiment, the plasticizer in component B is 52# chlorinated paraffin.

[0039] In a preferred embodiment, the defoamer in component B is a polymeric defoamer.

[0040] More preferably, in component B, the polymeric defoamer is a polyamide defoamer and / or a polyester defoamer.

[0041] Preferably, in component B, the dispersant is a modified polyurethane solution dispersant.

[0042] Preferably, in component B, the pigments and fillers are selected from at least two of carbon black, heavy calcium carbonate powder, and talc powder.

[0043] More preferably, in component B, the pigment and filler have an average particle diameter of 10-20 μm and a moisture content of ≤0.1 wt%.

[0044] According to a particularly preferred embodiment, in component B, the pigment and filler are a combination of talc and heavy calcium carbonate in a mass ratio of 1:0.8-1.2. The inventors of this invention have discovered that, in this preferred embodiment, the flame-retardant two-component polyurethane waterproof coating provided by this invention has better heat resistance.

[0045] More preferably, in component B, the chain extender is type II 3,3'-dichloro-4,4'-diaminodiphenylmethane.

[0046] Preferably, in component B, the catalyst is selected from at least one of organobismuth and organozinc.

[0047] More preferably, in component B, solvent II is selected from at least one of thylene, propylene glycol methyl ether acetate, and butyl acetate.

[0048] More preferably, in component B, solvent II is trimethylbenzene.

[0049] As previously described, a second aspect of the present invention provides a method for preparing a flame-retardant two-component polyurethane waterproof coating, the method being carried out using the components of the composition described in the first aspect, the method comprising:

[0050] The components of component A are mixed and reacted to obtain material A, wherein the polyurethane prepolymer in component A is obtained by first contacting the components of a mixture containing a first main agent and a first auxiliary agent; and

[0051] The components in component B are brought into a second contact to obtain material B.

[0052] Preferably, the conditions for the first contact include a temperature of 50-120°C.

[0053] According to one specific implementation, the operation of the first contact includes:

[0054] (1) The first main agent and diisocyanate are stirred for the first time to obtain intermediate I;

[0055] (2) Mix intermediate I with solvent I for the second time to obtain material A.

[0056] More preferably, in step (1), the first main agent is dehydrated before the first stirring, and then the first stirring is performed. The conditions for the dehydration treatment include: a rotation speed of 50-65 rpm, a vacuum degree of -0.085 to -0.095 MPa, a temperature of 90-120℃, and a time of 2-3 h.

[0057] Preferably, in step (1), the conditions for the first stirring include: a temperature of 80-90°C, a rotation speed of 50-65 rpm, and a time of 3-4 h.

[0058] Preferably, in step (2), the conditions for the second stirring include: a temperature of 65-75°C, a rotation speed of 50-65 rpm, and a time of 15-25 min.

[0059] More preferably, the material obtained after the second stirring in step (2) is subjected to post-processing. The present invention does not have special requirements for the conditions of the post-processing; it can be carried out according to known operating and process conditions in the art, which will not be elaborated upon here. Those skilled in the art should not understand this as a limitation of the present invention. Exemplary examples include cooling, filtration, and packaging.

[0060] Preferably, the conditions for the second contact include: a rotational speed of 50-1000 rpm and a temperature of 60-120°C.

[0061] According to one specific implementation, the operation of the second contact includes:

[0062] (a) The second main agent, plasticizer, defoamer, and dispersant are mixed in the first step to obtain mixture I;

[0063] (b) Mixture I is mixed with chain extender and pigments and fillers in sequence, and then dehydrated to obtain mixture II;

[0064] (c) Mixture II is mixed with catalyst and solvent II for a third time to obtain material B.

[0065] Preferably, in step (a), the conditions for the first mixing include: a rotation speed of 700-800 rpm, a temperature of 90-100°C, and a time of 45-60 min.

[0066] Preferably, in step (b), the conditions for the second mixing include: a rotation speed of 800-1000 rpm, a time of 20-30 min, and a temperature of 90-100℃.

[0067] Preferably, in step (b), the dehydration treatment conditions include: a temperature of 95-115°C, a vacuum degree of -0.085MPa to -0.095MPa, and a time of 2-3 hours.

[0068] According to a particularly preferred embodiment, in step (b), the pigments and fillers are dried before the second mixing to obtain dried pigments and fillers, and then the second mixing is performed. The drying conditions include a temperature of 105-110°C and a time of 1.5-2.5 hours. The inventors of this invention have found that, under this preferred embodiment, the flame-retardant two-component polyurethane waterproof coating provided by this invention has better tensile strength properties.

[0069] Preferably, in step (c), the conditions for the third mixing include: a rotation speed of 50-65 rpm, a time of 10-20 min, and a temperature of 60-70 °C.

[0070] More preferably, the material B obtained after the third mixing in step (c) undergoes post-processing. The present invention does not impose special requirements on the conditions of the post-processing; it can be carried out according to known operating and process conditions in the art, which will not be elaborated upon here. Those skilled in the art should not interpret this as a limitation of the present invention. Exemplary examples include cooling, filtration, and packaging.

[0071] More preferably, the A material and the B material are prepared and used immediately at a mass ratio of 1:3.

[0072] As previously stated, the third aspect of the present invention provides a flame-retardant two-component polyurethane waterproof coating prepared by the second aspect.

[0073] As previously stated, the fourth aspect of the present invention provides the application of the flame-retardant two-component polyurethane waterproof coating described in the third aspect in the field of building waterproof coatings.

[0074] The present invention will be described in detail below through embodiments. Unless otherwise specified, all instruments and materials used in the following embodiments are commercially available products.

[0075] Polypropylene glycol, purchased from Zibo Dexin Federal Chemical Industry Co., Ltd., brand name DDL-2000D, has a number average molecular weight of 2000, a hydroxyl value of 56±1.5mg KOH / g, and a functionality of 2.

[0076] Polypropylene triol, purchased from Zibo Dexin Federal Chemical Industry Co., Ltd., brand name DMD-3000, has a number average molecular weight of 3000, a hydroxyl value of 56±1.5mg KOH / g, and a functionality of 3.

[0077] Bisphenol A polyether polyol I: Specifically, it is bisphenol A / ethylene oxide diol, purchased from Shandong Lanxing Dongda Co., Ltd., with the brand name A-600E, a number average molecular weight of 600, a hydroxyl value of 168±5mg KOH / g, and a functionality of 2.

[0078] Bisphenol A polyether polyol II: Specifically, it is bisphenol A / ethylene oxide diol, purchased from Shandong Lanxing Dongda Co., Ltd., with the brand name A-2000E, a number average molecular weight of 2000, a hydroxyl value of 54±2mg KOH / g, and a functionality of 2.

[0079] Toluene diisocyanate, purchased from Yantai Wanhua Polyurethane Co., Ltd., brand name TDI-80;

[0080] Trimethylbenzene was purchased from Jiangsu Hualun Chemical Co., Ltd., and its grade was S-100.

[0081] Pigment and filler I: Talc powder, with an average particle diameter of 18μm, purchased from Qixia Rongguan Talc Powder Co., Ltd.;

[0082] Pigment and filler II: heavy calcium carbonate, with an average particle diameter of 13μm, purchased from Haicheng Xinshengda Powder Co., Ltd.

[0083] 52# chlorinated paraffin, purchased from Guangzhou Yuting Chemical Technology Co., Ltd.;

[0084] Defoamer: Specifically, it is a polyamide defoamer, purchased from BYK GmbH, Germany, brand name BYK-054;

[0085] Dispersant: Specifically, a modified polyurethane solution dispersant, purchased from BYK GmbH, Germany, brand name BYK-170;

[0086] Type II MOCA (Type II 3,3'-dichloro-4,4'-diaminodiphenylmethane), purchased from Suzhou Xiangyuan New Materials Co., Ltd., brand name XYlink Type II-MOCA;

[0087] The organic zinc catalyst was purchased from Guangzhou Yourun Synthetic Materials Co., Ltd., with the brand name ZCAT-EY18.

[0088] In the following examples, the amounts of the components are expressed in parts by weight, and unless otherwise specified, each part by weight is 100g.

[0089] In the following embodiments, the first main agent is first dehydrated. Exemplarily, the dehydration process includes: adding the first main agent (polypropylene glycol, polypropylene triol and bisphenol A polyether polyol) into a reaction vessel, stirring at 60 rpm and heating to 100°C, then turning on the vacuum equipment and dehydrating for 2.5 h under a vacuum of -0.09 MPa.

[0090] Example 1

[0091] The components in component A are mixed and reacted to obtain material A. Specifically, the steps are as follows:

[0092] (1) The first main agent after dehydration is stirred with toluene diisocyanate to obtain intermediate I;

[0093] (2) Mix intermediate I with trimethylbenzene (i.e. solvent I) for a second time. After mixing, turn off the machine, filter with nitrogen, discharge and package to obtain material A.

[0094] And to bring the second main agent and the second auxiliary agent in component B into a second contact, specifically, the steps are as follows:

[0095] (a) Add polyoxypropylene triol (i.e., the second main agent, polyoxyolefin polyol), 52# chlorinated paraffin (i.e., plasticizer), defoamer, dispersant and other liquid materials to the reaction vessel for the first mixing to obtain mixture I.

[0096] (b) Mixture I was mixed sequentially with chain extender type II 3,3'-dichloro-4,4'-diaminodiphenylmethane (i.e., type II MOCA) and dried pigments and fillers (18μm talc powder and 13μm heavy calcium carbonate were placed in a drying equipment and baked at 100℃ for 2h, and the moisture content after drying was ≤0.1wt%), and then dehydrated to obtain mixture II;

[0097] (c) Mixture II is mixed with organozinc catalyst (i.e. catalyst) and trimethylbenzene (i.e. solvent II) for a third time. After mixing, the temperature is lowered to 60°C, the machine is turned off, nitrogen is purged and filtered, and the material is packaged and discharged to obtain the material.

[0098] The remaining specific process parameters of this embodiment are shown in Tables 1 and 2.

[0099] Examples 2-5

[0100] The same process as in Example 1 was used, except that the types and amounts of raw materials used in the other examples were different, as detailed in Tables 1 and 2.

[0101] Table 1

[0102]

[0103] Table 2

[0104]

[0105] Comparative Example 1

[0106] The procedure was the same as in Example 1, except that bisphenol A polyether polyol I was not added. Specifically,

[0107] The amount of polypropylene glycol in component A was adjusted from 25 parts by weight to 30 parts by weight; the amount of polypropylene triol was adjusted from 32 parts by weight to 42 parts by weight; and the amount of bisphenol A polyether polyol I was adjusted from 15 parts by weight to 0.

[0108] All other process parameters are the same as in Example 1.

[0109] Comparative Example 2

[0110] The procedure was the same as in Example 1, except that bisphenol A polyether polyol I was not added. Specifically,

[0111] The amount of polypropylene glycol in component A was adjusted from 25 parts by weight to 36 parts by weight; the amount of polypropylene triol was adjusted from 32 parts by weight to 36 parts by weight; and the amount of bisphenol A polyether polyol I was adjusted from 15 parts by weight to 0.

[0112] All other process parameters are the same as in Example 1.

[0113] Comparative Example 3

[0114] The procedure was the same as in Example 1, except that the weight ratio of polyoxyolefin polyol to bisphenol A polyether polyol was 7:1. Specifically,

[0115] The amount of polypropylene glycol in component A was adjusted from 25 parts by weight to 30 parts by weight; the amount of polypropylene triol was adjusted from 32 parts by weight to 33 parts by weight; and the amount of bisphenol A polyether polyol was adjusted from 15 parts by weight to 9 parts by weight.

[0116] All other process parameters are the same as in Example 1.

[0117] Comparative Example 4

[0118] The procedure was the same as in Example 1, except that the weight ratio of the first main agent to the first auxiliary agent was 5.7:1. Specifically,

[0119] The amount of polypropylene glycol in component A is adjusted from 25 parts by weight to 29 parts by weight; the amount of polypropylene triol is adjusted from 32 parts by weight to 38 parts by weight; the amount of bisphenol A polyether polyol is adjusted from 15 parts by weight to 18 parts by weight; the amount of toluene diisocyanate is adjusted from 13 parts by weight to 7 parts by weight; and the amount of trimethylbenzene is adjusted from 15 parts by weight to 8 parts by weight.

[0120] All other process parameters are the same as in Example 1.

[0121] Comparative Example 5

[0122] The procedure was the same as in Example 1, except that, based on the total weight of component B, the content of polyoxyolefin polyol in component B was 12 wt%. Specifically,

[0123] The amount of polyoxypropylene triol in component B was adjusted from 7.3 parts by weight to 12 parts by weight; the amount of 18μm talc was adjusted from 25 parts by weight to 23 parts by weight; and the amount of 13μm heavy calcium carbonate was adjusted from 25 parts by weight to 24.3 parts by weight.

[0124] All other process parameters are the same as in Example 1.

[0125] Comparative Example 6

[0126] The same process as in Example 1 was used, except that the polyoxyolefin polyol in the first main agent was replaced with an equal amount of bisphenol A polyether polyol I, and all other process parameters were the same as in Example 1.

[0127] Comparative Example 7

[0128] The same process as in Example 1 was used, except that the polyoxypropylene triol in component B was replaced with an equal amount of bisphenol A polyether polyol I, and all other process parameters were the same as in Example 1.

[0129] Test case

[0130] Materials A and B in the examples and comparative examples are prepared and used immediately at a mass ratio of 1:3 to obtain the product, which is then tested.

[0131] Basic performance testing of the product: Referencing the national standard GB / T 19250-2013 for polyurethane waterproofing, the standard for single-component type I, and the standard for testing the flammability of plastics GB / T 2408—2021. The test standards and results are shown in Table 3.

[0132] Table 3

[0133]

[0134] Table 3 (Continued)

[0135]

[0136] The results above show that the flame-retardant two-component polyurethane waterproof coating provided by this invention can meet the national standard requirements for polyurethane waterproof coatings. At the same time, it has excellent overall physical properties, especially tensile strength, tear strength and tensile strength retention rate after heat treatment. In addition, the flame-retardant two-component polyurethane waterproof coating provided by this invention has good flame-retardant properties and can meet the standards for testing the combustion performance of plastics.

[0137] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for a flame-retardant two-component polyurethane waterproof coating, characterized in that, The composition contains component A and component B in a weight ratio of 1:1-5. Component A includes a polyurethane prepolymer, which is prepared from a mixture containing a first main agent and a first auxiliary agent. The first main agent is a polyoxyolefin polyol and a bisphenol A polyether polyol in a weight ratio of 1-6:1, and the first auxiliary agent contains diisocyanate. The weight ratio of the first main agent to the first auxiliary agent is 1-4:

1. Component B consists of a second main agent and a second auxiliary agent, wherein the second main agent is at least one of polyoxyolefin polyols; based on the total weight of component B, the content of the polyoxyolefin polyol in component B is 5wt%-10wt%; The polyoxyolefin polyol is selected from at least one of polyoxypropylene diol, polyoxypropylene triol, and polyoxypropylene-ethylene triol, and the number average molecular weight of the polyoxyolefin polyol is 2000-5000, the hydroxyl value is 33-60 mg KOH / g, and the functionality is 2-3.

2. The composition according to claim 1, characterized in that, In component A, the number-average molecular weight of the bisphenol A polyether polyol is 400-1100, the hydroxyl value is 101-285 mg KOH / g, and the functionality is 2.

3. The composition according to claim 1, characterized in that, In component A, the diisocyanate is selected from at least one of toluene diisocyanate and diphenylmethane diisocyanate.

4. The composition according to any one of claims 1-3, characterized in that, In component B, the second additive contains a plasticizer, an antifoaming agent, a dispersant, pigments and fillers, a chain extender, a catalyst, and solvent II.

5. The composition according to claim 4, characterized in that, Based on the total weight of component B, the content of the plasticizer is 20wt%-40wt%, the content of the defoamer is 0.1wt%-0.8wt%, the content of the dispersant is 0.1wt%-0.8wt%, the content of the pigments and fillers is 40wt%-60wt%, the content of the chain extender is 2wt%-10wt%, the content of the catalyst is 0.1wt%-0.8wt%, and the content of solvent II is 2wt%-10wt%.

6. The composition according to claim 4, characterized in that, In component B, the plasticizer is selected from at least one of trioctyl phosphate and chlorinated paraffin plasticizer; And / or, in component B, the pigments and fillers are selected from at least two of carbon black, heavy calcium carbonate powder, and talc powder; And / or, in component B, the chain extender is type II 3,3'-dichloro-4,4'-diaminodiphenylmethane; And / or, in component B, the catalyst is selected from at least one of organobismuth and organozinc.

7. A method for preparing a flame-retardant two-component polyurethane waterproof coating, characterized in that, This method is performed using any of the components in the composition according to any one of claims 1-6, and the method includes: The components of component A are mixed and reacted to obtain material A, wherein the polyurethane prepolymer in component A is obtained by first contacting the components of a mixture containing a first main agent and a first auxiliary agent; and The components in component B are brought into a second contact to obtain material B.

8. The method according to claim 7, characterized in that, The conditions for the first contact include: a temperature of 50-120°C; And / or, the conditions for the second contact include: a rotational speed of 50-1000 rpm and a temperature of 60-120°C.

9. A flame-retardant two-component polyurethane waterproof coating prepared by the method of claim 7 or 8.

10. The application of the flame-retardant two-component polyurethane waterproof coating according to claim 9 in the field of building waterproof coatings.

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