A sprayable fast-drying bio-based polyurethane waterproof coating and a preparation method thereof

Abstract

The application discloses a kind of spray fast-drying type bio-based polyurethane waterproof coating, including component A and component B, component A includes bio-based polyurethane prepolymer and auxiliary agent A with high reactivity;Component B includes bio-based resin polyol, steric amine chain extender, flame-retardant plasticizer, active mineral filler, catalyst, auxiliary agent B with high reactivity and water-removing agent.Component A and component B mix quickly auxiliary agent A, B reaction small molecule polyurea anti-sag agent, solve product facade sag problem while not increasing product viscosity, synergistic powder activation technology realizes product solvent-free;Through catalyst and chain extender technology coordination, let polyurethane waterproof coating dry quickly, meet large-area mechanical spraying construction.The introduction of bio-based material not only realizes the green manufacturing of product, also improves the compatibility of polyurethane waterproof coating and waterproofing membrane.The preparation method involved in the application is simple, does not need dehydration treatment, low energy consumption, high production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of waterproof coating technology, specifically relating to a sprayable fast-drying bio-based polyurethane waterproof coating and its preparation method. Background Technology

[0002] Currently, there are two main types of waterproof coatings on the market: one is polymer-cement-based waterproof coatings, which are composed of emulsions synthesized from various water-based polymers and high-quality cement mixed with various additives. The flexibility of the polymer (resin) and the rigidity of the cement are combined into one. Its advantages include low overall cost and non-toxicity / environmental friendliness, but the product has poor water resistance and low elasticity. The other type is polyurethane waterproof coatings. These materials have high elongation and resilience, are resistant to water immersion, and are resistant to corrosion from various chemicals, gaining popularity in the market as soon as they were introduced. However, most polyurethane waterproof coatings lack anti-sagging properties. Currently, domestic technology addresses the sagging problem by adding fumed silica, bentonite, and nano-calcium carbonate to the coating, but this results in high product viscosity, requiring the addition of large amounts of organic solvents to reduce the viscosity during application. These organic solvents pollute the environment, are prone to fire, and harm workers' health. In recent years, anti-sagging agents with polyurea structures have appeared on the market. While the effect is significant, these products also contain large amounts of organic solvents and are expensive. Furthermore, existing polyurethane waterproof coatings on the market have slow drying times and require multiple applications, severely impacting construction progress.

[0003] To address the aforementioned technical challenges, Chinese invention patent CN104559734B discloses a two-component chemically reactive thixotropic polyurethane waterproof coating. Component B of this invention contains a special amine reactant that can react with the prepolymer of component A. Under the action of a specific polymerization inhibitor, a polyurea compound is generated within 5-10 minutes after the two components are mixed. This compound forms numerous hydrogen bonds with the polyurethane prepolymer, thus giving the two-component polyurethane waterproof coating excellent thixotropic properties. However, because the reaction between the prepolymer and the special amine produces a high-molecular-weight polyurea structure, it drastically increases the static viscosity of the system, causing the viscosity to increase instantaneously by tens of times. Therefore, organic solvents need to be added to reduce the viscosity during formulation and application. Furthermore, since the mixing and reaction time of the two components exceeds 5 minutes, if the product is applied by mixing and mechanical spraying simultaneously, sagging problems will still occur when directly sprayed onto vertical surfaces. Chinese invention patent CN114410210B discloses a two-component anti-sagging polyurethane waterproof coating. This technology adds an organic thixotropic agent to component A, which contains isocyanate, and an inorganic thixotropic agent to component B, which does not contain isocyanate. When components A and B are mixed, under the synergistic effect of the organic and inorganic thixotropic agents, a three-dimensional thixotropic network with "line-surface" or "line-line" structures is rapidly formed, thus endowing the coating with good thixotropic properties and giving the coating excellent anti-sagging effects. However, the product requires the addition of a large amount of organic solvent to reduce the viscosity during application, making it environmentally unfriendly. Furthermore, the product has a long drying time, which cannot meet the rapid construction requirements of waterproofing projects.

[0004] Due to the wide variety of waterproofing materials, waterproofing construction design and maintenance often involve the combination or overlap of different types of materials, especially the combination or overlap of waterproof membranes and waterproof coatings. Since asphalt waterproof membranes and polymer waterproof membranes are non-polar materials with low surface energy, while polyurethane coatings are polar materials with high surface energy, overlapping or combining them can lead to poor adhesion and even detachment. Therefore, there is an urgent need to develop a polyurethane waterproof coating with even lower polarity to solve the engineering problem of poor adhesion between asphalt or polymer waterproof membranes and polyurethane waterproof coatings.

[0005] Actual waterproofing projects are complex, involving both planar and vertical surface construction, compatibility issues between coatings and membranes, and uncontrolled manual mixing of coatings. Controlling the curing speed and time is crucial to achieve the designed thickness with a single application of waterproof coating, followed immediately by the laying of the waterproof membrane to complete the final waterproofing process, thus significantly improving construction efficiency. Clearly, existing technologies cannot meet these requirements.

[0006] Therefore, developing a solvent-free polyurethane waterproof coating to solve the environmental pollution and health hazards caused by organic solvents, while significantly reducing the drying time of the polyurethane waterproof coating and adopting a spray application method to greatly improve construction efficiency and meet the current fast-paced construction requirements, is obviously of positive practical significance. Summary of the Invention

[0007] In view of this, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a bio-based polyurethane waterproof coating that can be sprayed, cured quickly, does not drip on vertical surfaces, has good compatibility with waterproof membranes, and is solvent-free, thereby improving construction efficiency, enhancing the quality of waterproofing projects, and protecting the environment to cope with increasingly complex waterproofing conditions.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a sprayable fast-drying bio-based polyurethane waterproof coating, which is composed of component A and component B by mass.

[0009] The main components of component A are as follows:

[0010] 60-80 parts of bio-based resin polyol;

[0011] 17–38 parts of isocyanate monomer;

[0012] Additive A: 0.5–3 parts;

[0013] The B component mainly includes the following components:

[0014]

[0015] The waterproof coating does not contain organic solvents.

[0016] The purpose of this invention is to provide a spray-applied, fast-drying polyurethane waterproof coating. This is achieved by adding specific additives A and B to components A and B, respectively. Before mixing, additives A and B are in a liquid state, which reduces the system viscosity. Additive A in component A exhibits higher reactivity than the isocyanate monomer, while additive B in component B exhibits higher reactivity than the chain extender. When components A and B are mixed, additives A and B preferentially and rapidly undergo chemical cross-linking, generating a product containing polyurea characteristic groups. The invention utilizes small-molecule substances to provide thixotropy to polyurethane waterproof coatings, resulting in an anti-sagging effect that prevents the coating from flowing on slopes and vertical surfaces, ensuring a smooth surface and uniform thickness. Compared to traditional high-molecular-weight polyurea structures, the small-molecule substances produced in this invention offer the advantage of providing an anti-sagging effect without increasing the system's viscosity. The reaction between additives A and B is completed instantaneously within 1-20 seconds of mixing, allowing for simultaneous mixing and spraying without sagging during mechanical spraying. By selecting specific chain extenders and trace catalysts to enhance curing speed, the product achieves surface dryness within minutes and complete dryness within 30 minutes, enabling a single thick coat application. Once the product is completely dry, the next application step can proceed immediately, significantly improving construction efficiency and reducing the construction cycle. The use of surface-modified active mineral fillers greatly mitigates the problems of increased system viscosity and powder settling caused by mineral fillers. This invention controls material moisture by adding a dehydrating agent, eliminating the need for dehydration processes, thus saving energy and improving production efficiency.

[0017] This invention uses bio-based resin to modify the product. Since the polyol molecules of bio-based resin have a carbon-carbon structure as the main chain, the polarity of the carbon-oxygen main chain is much weaker than that of traditional polyethylene oxide polyols or polypropylene oxide polyols. This can reduce the polarity of polyurethane waterproof coatings, improve the peel strength between the coating and the roll material, and improve the compatibility of polyurethane waterproof coatings with polymer roll materials and bitumen-based waterproof roll materials.

[0018] Preferably, the auxiliary agent A is selected from one or more of diphenylmethane diisocyanate (MDI), polyphenylmethylene polyisocyanate (PAPI), liquefied diphenylmethane diisocyanate, and diphenylmethylene isocyanate.

[0019] Preferably, the auxiliary agent B is selected from diamine (H2N-R-NH2) and teramine. Or a mixture of the two, wherein R can be an aliphatic or aromatic alkane structure, a polyether structure, a polyester structure, or a blend of aliphatic and aromatic structures.

[0020] Preferably, the bio-based resin polyols in components A and B are the same or different, and are selected from one or more of castor oil, modified castor oil hydroxyl-terminated resin, hydroxyl-terminated soybean oil, modified soybean oil hydroxyl-terminated resin, and modified palm oil hydroxyl-terminated resin.

[0021] Preferably, the isocyanate monomer is selected from one or more of toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate. More preferably, the isocyanate monomer is toluene diisocyanate.

[0022] Preferably, the active mineral filler is selected from one or more of talc, kaolin, mica powder, calcium carbonate, and wollastonite activated by a chemical coating method. The chemical coating method is known and refers to a method of modifying the surface of inorganic particles using silane coupling agents, alkyl fatty acid coupling agents, titanate coupling agents, etc. The mineral powders include, but are not limited to, talc, kaolin, mica powder, calcium carbonate, and wollastonite.

[0023] Preferably, the catalyst is an organotin catalyst or an organobismuth catalyst.

[0024] Preferably, the flame-retardant plasticizer is selected from one or more of chlorinated paraffin, trioctyl phosphate, diphenyltoluene phosphate, diphenylisodecyl phosphate, dimethyl methyl phosphate, diethyl ethyl phosphate, tri(2-chloropropyl) phosphate, and tri(2-chloroethyl) phosphate.

[0025] Preferably, the chain extender is a sterically hindered amine chain extender, and the sterically hindered amine chain extender is preferably one or more of dimethylthiotoluene diamine, 4,4'-di(alkylamino)-diphenylmethane, N,N'-dialkylphenyldiamine, 4,4'-di(alkylamino)-dicyclohexylmethane, and polyaspartic acid esters prepared by the Michael addition reaction of dialkyl maleate and aliphatic primary diamine.

[0026] Preferably, the petroleum asphalt is selected from one or more of petroleum asphalt grades 70, 90, 100, 150 and 200.

[0027] Preferably, the dehydrating agent is selected from one or more of calcium oxide, magnesium oxide, and vinylalkoxysilane coupling agents.

[0028] This invention also claims protection for a method for preparing a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising the following steps:

[0029] The two-component waterproof coating consists of component A and component B;

[0030] The manufacturing method of component A includes the following steps: adding polyether polyol with a water content of less than 0.05% to a reaction vessel, purging with nitrogen for protection, heating the material to above 80°C, adding isocyanate monomer, stirring and mixing at 70-90°C for 2-3 hours, then cooling to 60°C, adding auxiliary agent A, and continuing to stir for 10-30 minutes to obtain component A;

[0031] The manufacturing method of component B includes the following steps: adding bio-based resin polyol, flame-retardant plasticizer, additive B and chain extender to a reaction vessel, purging with nitrogen for protection, heating to 70-90℃, then adding asphalt, and after the asphalt melts, adding active mineral filler, maintaining the material temperature at 70-90℃, and dispersing at high speed by shearing for at least 30 minutes, transferring the material to another reaction vessel via a grinding pump without heating or cooling, determining the moisture content with a moisture analyzer, adding the corresponding dehydrating agent, stirring and mixing for 10-30 minutes, adding the catalyst and dehydrating agent, and stirring and mixing for 10-30 minutes to obtain component B.

[0032] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0033] 1. This invention develops a novel fast-drying bio-based polyurethane waterproof coating with high production efficiency and low energy consumption. The product features solvent-free, anti-sagging, rapid molding, and good compatibility with waterproof membranes. The product is safe and environmentally friendly, with high construction efficiency, and can meet the design requirements of various waterproofing projects to the greatest extent.

[0034] 2. This invention introduces bio-based materials to replace some petrochemical-based materials. In addition to solving the compatibility problem between polyurethane waterproof coatings and waterproof membranes, it can also greatly reduce carbon emissions and contribute to the green development of the industry.

[0035] The present invention will be further described below with reference to embodiments. However, the present invention is not limited to the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to different requirements of specific applications, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other. Detailed Implementation

[0036] The present invention will be further described below with reference to embodiments:

[0037] Example 1

[0038] This embodiment provides a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising component A and component B, wherein the mixing ratio of component A and component B is 1:1;

[0039] By weight, the raw materials of component A include 80 parts of modified castor oil polyol (brand name Uric H-62, Ito Chemical, Japan), 17 parts of toluene diisocyanate (brand name T-80, Yantai Wanhua Chemical), and 3 parts of diphenylmethane diisocyanate (brand name MI-50, Yantai Wanhua Chemical).

[0040] Component B raw materials include 20 parts of modified castor oil polyol (brand name Uric F-15, Ito Chemical, Japan), 15 parts of No. 90 petroleum asphalt, 3 parts of N,N'-dialkylphenyl diamine (brand name Wanalink 6200, Wanhua Chemical), 19.49 parts of chlorinated paraffin (brand name No. 52, Danyang Suxing New Materials), 40 parts of activated fine calcium carbonate (brand name carb 5T, Omia), 0.01 parts of dibutyltin dilaurate (brand name T-12, Jiangsu Mingtai New Materials), 2 parts of di-polyetheramine (brand name CAD230, Yangzhou Chenhua), and 0.5 parts of vinyltrimethoxysilane (brand name WD-21, Wuhan University Organosilicon).

[0041] Its preparation method specifically includes:

[0042] Preparation of component A: Add 80 parts of Uric H-62 to the reactor, purge with nitrogen for protection, heat to 80°C, add 17 parts of T-80, stir and mix at 70-90°C for 2 hours, then cool to 60°C, add 3 parts of MI-50, and stir for another 25 minutes to obtain component A.

[0043] Preparation of Component B: Add 20 parts of Uric H-62, 19.49 parts of No. 52 chlorinated paraffin, and 3 parts of Wanalin 6200 to the reactor. Purge with nitrogen for protection and heat to 70-90℃. Then add 15 parts of No. 70 petroleum asphalt. After the asphalt melts, add 40 parts of carb 5T calcium powder. Maintain the material temperature at 70-90℃ and perform high-speed shearing for 30 minutes. Transfer the material to another reactor via a grinding pump. No heating or cooling is required. Measure the moisture content using a moisture analyzer. Add 0.5 parts of WD-21 dehydrating agent and stir for 20 minutes. Add 0.01 parts of T-12 catalyst and 2 parts of CAD230 and stir for 25 minutes to obtain Component B.

[0044] Example 2

[0045] This embodiment provides a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising component A and component B, wherein the mixing ratio of component A and component B is 1:1;

[0046] By weight, the raw materials of component A include 75 parts of modified castor oil polyol (brand name Uric H-57, Ito Chemical, Japan), 23 parts of toluene diisocyanate (brand name T-80, Yantai Wanhua Chemical), and 2 parts of polyphenyl polymethylene polycyanate (brand name PM-200, Yantai Wanhua Chemical).

[0047] Component B raw materials include 25 parts of modified soybean oil polyol (brand name FH-2120, Jiangsu Feihang Technology), 10 parts of No. 90 petroleum asphalt, 5 parts of N,N'-dialkylphenyl diamine (brand name Wanalink 6200, Wanhua Chemical), 19.48 parts of diethyl phosphate (brand name DEEP, Yangzhou Chenhua), 38 parts of activated calcium carbonate (brand name carb 2T, Omia), 0.02 parts of stannous octoate (brand name T-9, Jiangsu Yake Chemical), 1.5 parts of ternary polyetheramine (brand name CAT403, Yangzhou Chenhua), and 1 part of fine magnesium oxide (brand name MS-180, Hebei Meishen Technology).

[0048] The preparation method is the same as in Example 1.

[0049] Example 3

[0050] This embodiment provides a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising component A and component B, wherein the mixing ratio of component A and component B is 1:1;

[0051] By weight, the raw materials of component A include 70 parts of modified castor oil polyol (brand name Uric H-57, Japan Ito Chemical), 29 parts of toluene diisocyanate (brand name T-80, Yantai Wanhua), and 1 part of polyphenyl polymethylene polycyanate (brand name PM-200, Yantai Wanhua Chemical).

[0052] Component B raw materials include 30 parts of modified soybean oil polyol (brand name FH-3170, Jiangsu Feihang Technology), 60 parts of No. 200 petroleum asphalt, 7 parts of polyaspartic acid ester (brand name F-520, Zhuhai Feiyang Chemical), 17.97 parts of tris(2-chloropropyl) phosphate (brand name TCPP, Yangzhou Chenhua), 37 parts of active talc powder (brand name RP-6, Guangxi Kelong Powder), 0.03 parts of dibutyltin dilaurate (brand name T-12, Jiangsu Mingtai Chemical), 1 part of diethyltoluene diamine (brand name E-100, Shandong Chuangli Technology), and 1 part of fine magnesium oxide (brand name MS-180, Hebei Meishen Technology).

[0053] The preparation method is the same as in Example 1.

[0054] Example 4

[0055] This embodiment provides a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising component A and component B, wherein the mixing ratio of component A and component B is 1:1;

[0056] By weight, the raw materials of component A include 60 parts of modified castor oil polyol (brand name Uric H-62, Ito Chemical, Japan), 39.5 parts of toluene diisocyanate (brand name T-80, Yantai Wanhua Chemical), and 0.5 parts of diphenylmethane diisocyanate (brand name MI-50, Yantai Wanhua Chemical).

[0057] Component B raw materials include 40 parts of modified soybean oil polyol (brand name FH-2010, Jiangsu Feihang Technology), 10 parts of dimethylthiotoluene diamine (brand name E-300, Albemarle Chemicals), 19.45 parts of chlorinated paraffin (brand name 42, Danyang Suxing New Materials), 28 parts of active talc (brand name CSP-1C, Jiangsu Qunxin Powder), 0.05 parts of bismuth neodecanoate (brand name FT-13, Suzhou Fite New Materials), 0.5 parts of di-polyetheramine (brand name CAD230, Yangzhou Chenhua), and 2 parts of fine calcium oxide (brand name JYQ-02, Changshu Hongyu Calcium Compounds).

[0058] The preparation method is the same as in Example 1.

[0059] Comparative Example 1

[0060] This embodiment provides a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising component A and component B, wherein the mixing ratio of component A and component B is 1:1;

[0061] By weight, the raw materials of component A include 80 parts of modified castor oil polyol (brand name Uric H-62, Ito Chemical, Japan) and 20 parts of toluene diisocyanate (brand name T-80, Yantai Wanhua Chemical).

[0062] Component B raw materials include 20 parts of modified castor oil polyol (brand name Uric F-15, Ito Chemical, Japan), 15 parts of No. 90 petroleum asphalt, 3 parts of N,N'-dialkylphenyl diamine (brand name Wanalink 6200, Wanhua Chemical), 19.49 parts of chlorinated paraffin (brand name No. 52, Danyang Suxing New Materials), 42 parts of activated fine calcium carbonate (brand name carb 5T, Omia), 0.01 parts of dibutyltin dilaurate (brand name T-12, Jiangsu Mingtai New Materials), and 0.5 parts of vinyltrimethoxysilane (brand name WD-21, Wuhan University Organosilicon).

[0063] The preparation method is the same as in Example 1.

[0064] Comparative Example 2

[0065] This embodiment provides a sprayable, fast-drying, bio-based polyurethane waterproof coating, comprising component A and component B, wherein the mixing ratio of component A and component B is 1:1;

[0066] By weight, the raw materials of component A include 80 parts of polypropylene oxide polyol (brand name DL-1000D, Lanxing Dongda Chemical), 17 parts of toluene diisocyanate (brand name T-80, Yantai Wanhua Chemical), and 3 parts of diphenylmethane diisocyanate (brand name MI-50, Yantai Wanhua Chemical).

[0067] Component B raw materials include 20 parts of polypropylene oxide polyol (brand name EP-3600, Lanxing Dongda Chemical), 15 parts of No. 90 petroleum asphalt, 3 parts of N,N'-dialkylphenyl diamine (brand name Wanalink 6200, Wanhua Chemical), 19.49 parts of chlorinated paraffin (brand name 52, Danyang Suxing New Materials), 39.5 parts of activated fine calcium carbonate (brand name carb 5T, Omia), 0.01 parts of dibutyltin dilaurate (brand name T-12, Jiangsu Mingtai New Materials), 2 parts of di-polyetheramine (brand name CAD230, Yangzhou Chenhua), 1 part of vinyltrimethoxysilane (brand name WD-21, Wuhan University Organosilicon), and 30 parts of organic solvent.

[0068] The preparation method is the same as in Example 1.

[0069] The examples and comparative examples were tested for surface drying time, complete drying time, and anti-sagging properties according to standard T / CECS10302-2023 "Anti-Sagging Polyurethane Waterproof Coating". The peel strength between the polyurethane waterproof coating and the waterproof membrane was tested according to GB / T328.20-2007 "Peel Performance of Asphalt Waterproof Membranes". The prepared polyurethane waterproof coating was mixed according to the specified ratio and applied in one coat using a 300mm×200mm×20mm cement mortar board. The coating thickness was 1.5mm. The waterproof membrane was then adhered after 1 hour. After curing under standard test conditions for 7 days, the peel strength was tested. The test results are shown in Table 1.

[0070] Table 1

[0071]

[0072] As can be seen from the comparison between Example 1 and Comparative Example 1 above, when the main components of the two are the same, the anti-sagging performance of the comparative example without the addition of additives A and B cannot meet the standard.

[0073] The test results show that the fast-drying bio-based polyurethane waterproof coating of the present invention has excellent anti-sagging effect and can be cured and formed quickly (the product achieves surface drying within 5 to 9 minutes and complete drying within 14 to 18 minutes); in addition, the bio-based polyurethane waterproof coating of the present invention has better adhesion performance to asphalt waterproof membrane and polymer waterproof membrane than Comparative Example 2.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spray-applied, fast-drying, bio-based polyurethane waterproof coating, characterized in that, It consists of component A and component B in parts by mass; The main components of component A are as follows: 60-80 parts of bio-based resin polyol; 17-38 parts of isocyanate monomer; Additive A: 0.5-3 parts; The B component mainly includes the following components: 20-40 parts of bio-based resin polyol; 5-15 parts of petroleum asphalt; Chain extender 2-8 parts; 10-20 parts of flame-retardant plasticizer; 30-50 parts of active mineral filler; Catalyst 0.01~0.05 parts; Additive B: 0.5-2 parts; 0.1-2 parts of dehydrating agent; The waterproof coating does not contain organic solvents; The auxiliary agent A is selected from one or more of diphenylmethane diisocyanate, polyphenylmethylene polyisocyanate, liquefied diphenylmethane diisocyanate and diphenylmethylene isocyanate; The auxiliary agent B is Or a mixture of the two, wherein R is an aliphatic or aromatic alkane structure, a polyether structure, a polyester structure, or a blend of aliphatic and aromatic structures; The preparation method of the above-mentioned waterproof coating includes the following steps: The waterproof coating is composed of component A and component B; The manufacturing method of component A includes the following steps: adding bio-based resin polyol to a reaction vessel, purging with nitrogen for protection, heating the material to above 80°C, adding isocyanate monomer, stirring and mixing at 70~90°C for 2-3 hours, then cooling to 60°C, adding auxiliary agent A, and continuing to stir for 10-30 minutes to obtain component A. The manufacturing method of component B includes the following steps: adding bio-based resin polyol, flame-retardant plasticizer, additive B and chain extender to a reaction vessel, purging with nitrogen for protection, heating to 70-90℃, then adding asphalt, and after the asphalt melts, adding active mineral filler, keeping the material at a constant temperature of 70-90℃, and dispersing by high-speed shearing for at least 30 minutes, transferring the material to another reaction vessel via a grinding pump without heating or cooling, measuring the moisture content with a moisture analyzer, adding the corresponding dehydrating agent, stirring and mixing for 10-30 minutes, adding the catalyst and dehydrating agent, and stirring and mixing for 10-30 minutes to obtain component B; The chain extender is selected from one or more of dimethylthiotoluene diamine, 4,4'-di(alkylamino)-diphenylmethane, N,N'-dialkylphenyldiamine, 4,4'-di(alkylamino)-dicyclohexylmethane, and polyaspartic acid esters prepared by the Michael addition reaction of dialkyl maleate esters and aliphatic primary diamines.

2. The sprayable fast-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The bio-based resin polyols in components A and B may be the same or different, and are selected from one or more of castor oil, modified castor oil hydroxyl-terminated resin, hydroxyl-terminated soybean oil, modified soybean oil hydroxyl-terminated resin, and modified palm oil hydroxyl-terminated resin.

3. The sprayable fast-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The isocyanate monomer is selected from one or more of toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate.

4. The sprayable fast-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The active mineral filler is selected from one or more of the following: talc powder, kaolin, mica powder, calcium carbonate, and wollastonite, which have been activated by chemical coating.

5. The sprayable quick-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The catalyst is an organotin catalyst or an organobismuth catalyst.

6. The sprayable fast-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The flame-retardant plasticizer is selected from one or more of chlorinated paraffin, trioctyl phosphate, toluene diphenyl phosphate, diphenyl isodecyl phosphate, dimethyl methyl phosphate, diethyl ethyl phosphate, tri(2-chloropropyl) phosphate, and tri(2-chloroethyl) phosphate.

7. The sprayable fast-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The petroleum asphalt is selected from one or more of petroleum asphalt grades 70, 90, 100, 150 and 200.

8. The sprayable fast-drying bio-based polyurethane waterproof coating according to claim 1, characterized in that: The dehydrating agent is selected from one or more of calcium oxide, magnesium oxide, and vinylalkoxysilane coupling agents.

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