Interlayer isolating agent for polyurethane coating, preparation method therefor, and use thereof

Abstract

Provided are a polyurethane coating, a preparation method therefor, and a use thereof. The polyurethane coating comprises maleic anhydride-modified polyurethane, silane-modified polyurethane, maleic anhydride-modified gel, and a solvent; the maleic anhydride-modified polyurethane is obtained by reacting raw materials comprising a polyol, maleic anhydride, an isocyanate and a catalyst; the silane-modified polyurethane is obtained by reacting raw materials comprising a polyol, a silane coupling agent, an isocyanate and a catalyst; the gel is selected from one or a combination of petroleum resin, asphalt, rosin resin, terpene resin, styrene-butadiene gel and butyl gel; the maleic anhydride-modified gel is obtained by reacting raw materials comprising maleic anhydride, the gel, and an initiator. The polyurethane coating can be used as a primer for a concrete substrate, or as an interlayer isolating agent between a polyurethane coating and rolled asphalt, capable of preventing the migration of additives such as plasticizers in conventional polyurethane coatings, and improving the compatibility and bonding performance between conventional polyurethane coatings and rolled asphalt.

Description

An interlayer release agent for polyurethane coating, and a preparation method and application thereof TECHNICAL FIELD

[0001] The present application relates to an interlayer release agent for polyurethane coating, and a preparation method and application thereof. BACKGROUND

[0002] In order to make the traditional self-adhesive asphalt roll material have good waterproof effect, polyurethane waterproof coating is usually coated under the roll material. However, the conventional polyurethane uses polyether and isocyanate as raw materials, and usually adds plasticizer, powder material, additive, solvent and the like for production and compounding. The polarity of the polyurethane is high, while the self-adhesive asphalt roll material is usually non-polar. Because the polarity difference between the two is large, the adhesion between the two is not firm, and the interfacial adhesion between the two is not large enough. In particular, the construction of the side wall slope roof system is poor in combination, and the interface is easy to be damaged and lose adhesion. When backfilling, the roll material may fall off and the like.

[0003] In addition, the plasticizer, solvent and small molecule substances in the traditional polyurethane coating are easy to migrate to the surface of the coating, which has a negative effect on the adhesion of the asphalt roll material, resulting in delamination of the roll material and the coating under long-term exposure or in extreme environments, affecting the waterproof effect and shortening the service life of the material. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an interlayer release agent for polyurethane coating in view of the shortcomings and deficiencies of the prior art. The interlayer release agent can isolate the migration of additives such as plasticizers in traditional polyurethane coating, has good adhesion with polyurethane, and can form high-strength adhesion with asphalt roll material, thereby improving the compatibility and adhesion performance of traditional polyurethane coating and asphalt roll material, while maintaining the excellent waterproofness of polyurethane coating.

[0005] To solve the above technical problems, the technical solutions adopted by the present application are as follows:

[0006] A polyurethane coating, the polyurethane coating comprising the following components: maleic anhydride modified polyurethane, silane modified polyurethane, maleic anhydride modified gum and solvent; the maleic anhydride modified polyurethane is obtained by reaction of raw materials comprising polyol, maleic anhydride, isocyanate and catalyst; the silane modified polyurethane is obtained by reaction of raw materials comprising polyol, silane coupling agent, isocyanate and catalyst; the gum is selected from one or a combination of more than one of petroleum resin, asphalt, rosin resin, terpene resin, styrene-butyl rubber and butyl rubber; the maleic anhydride modified gum is obtained by reaction of raw materials comprising maleic anhydride, gum and initiator.

[0007] The traditional polyurethane coating has a large polarity, while the asphalt waterproofing membrane is non-polar. The difference in polarity between the two results in insufficient adhesion when the two are bonded, and the polyurethane coating is prone to peeling off the waterproofing membrane. Moreover, the plasticizer and other additives in the traditional polyurethane coating are prone to migrate to the surface of the coating, which further exacerbates the peeling between the coating and the membrane layer. The inventors of the present application found that by setting a polyurethane interlayer spacing layer (which is formed by the polyurethane coating of the present application) with a polarity between the traditional polyurethane coating and the asphalt waterproofing membrane, the polyurethane interlayer spacing layer has similar composition to the traditional polyurethane coating and can be firmly bonded with the traditional polyurethane coating. In addition, the polyurethane interlayer spacing layer has a non-polar segment, which has good affinity with the non-polar asphalt waterproofing membrane, thereby greatly increasing the peeling strength between the polyurethane interlayer spacing layer and the asphalt waterproofing membrane, optimizing the compatibility and adhesion performance of the polyurethane interlayer spacing layer and the asphalt waterproofing membrane, and significantly improving the delamination and peeling problem between the asphalt waterproofing membrane and the polyurethane coating. Moreover, the specific composition of the polyurethane coating of the present application can micro-repair and compact the surface defects of the traditional polyurethane coating, thereby isolating the outward migration of harmful substances such as plasticizers in the traditional polyurethane coating, while maintaining the excellent waterproofing properties of polyurethane itself.

[0008] The base colloid in the maleic anhydride modified colloid is non-polar, which is beneficial for bonding with the non-polar asphalt waterproofing membrane. Moreover, the colloid itself is usually a tackifier, which can increase the adhesion strength. The silane coupling agent component in the silane modified polyurethane can improve the compatibility between the asphalt waterproofing membrane and the polyurethane. Moreover, the maleic anhydride modified polyurethane, the maleic anhydride modified colloid, and the silane modified polyurethane will further react after mixing, further improving the polarity degree of the polyurethane segment. The present application compounding the maleic anhydride modified polyurethane, the maleic anhydride modified colloid, and the silane modified polyurethane enables the polar and non-polar materials to obtain sufficient micro-phase fusion, and has extremely strong micro-pore repair and isolation capacity for the surface of the traditional polyurethane coating, which can prevent harmful substances from being precipitated, and has excellent and sustained adhesion to the traditional polyurethane coating, the waterproofing asphalt membrane, and other base layers.

[0009] In some embodiments, the mass ratio of the maleic anhydride modified polyurethane, the silane modified polyurethane, the maleic anhydride modified colloid, and the solvent is 10-35:10-30:12-25:28-40.

[0010] In some embodiments, the polyol is selected from a polyether polyol or a polyester polyol.

[0011] The polyether polyol can be, for example, one or more of a combination of 2000d, 1000d, 3050d, and 330Nd from Dongda Chemical.

[0012] In some embodiments, the isocyanate is selected from the group consisting of one or more of toluene diisocyanate TDI, diphenylmethane diisocyanate MDI, hexamethylene diisocyanate HDI, isophorone diisocyanate IPDI, and 4,4'-dicyclohexylmethane diisocyanate HMDI.

[0013] In some embodiments, the silane coupling agent is selected from the group consisting of one or more of WD50, KH550, KH560, KH570, and isocyanate propyl triethoxysilane IPTS.

[0014] In some embodiments, the catalyst is selected from the group consisting of one or more of organic tin NEOSTANN U-303, butyl tin dilaurate, stannous octoate, zinc isooctoate, bismuth isooctoate, bismuth neodecanoate, and zinc neodecanoate. Organic tin NEOSTANN U-303 is produced by Nippon Shokubai Co., Ltd., and has a composition of a reaction product of tetraethyl silicate and bis(acetyloxy) dibutyl tinane.

[0015] In some embodiments, the initiator is selected from the group consisting of an azo-based initiator or an organic peroxide-based initiator. The organic peroxide-based initiator can be, for example, dicumyl peroxide.

[0016] In some embodiments, the solvent is selected from the group consisting of one or more of aromatic hydrocarbons, dimethyl carbonate, and butyl acetate.

[0017] In some embodiments, in the raw material of the maleic anhydride-modified polyurethane, the mass ratio of the polyol, the maleic anhydride, the isocyanate, and the catalyst is 60-70:2-6:22-40:0.01-0.05.

[0018] In some embodiments, in the raw material of the silane-modified polyurethane, the mass ratio of the polyol, the silane coupling agent, the isocyanate, and the catalyst is 65-75:3-7:17-25:0.01-0.05.

[0019] In some embodiments, in the raw material of the maleic anhydride-modified gum, the mass ratio of the maleic anhydride, the gum, and the initiator is 15-25:75-85:0.05-0.15.

[0020] In some embodiments, the polyurethane coating further comprises a catalyst.

[0021] In some embodiments, the mass ratio of the maleic anhydride-modified polyurethane and the catalyst is 10-35:0.05-0.1.

[0022] In some embodiments, the polyurethane coating further comprises a solvent, a dispersant, an antifoaming agent, a water-removing agent, and a catalyst.

[0023] In some embodiments, the mass ratio of the maleic anhydride modified polyurethane, the silane modified polyurethane, the maleic anhydride modified gum, the solvent, the dispersant, the defoaming agent, the water removing agent, and the catalyst is 10-35:10-30:12-25:30-40:0.1-0.3:0.1-0.3:1-3:0.05-0.1.

[0024] In some embodiments, the dispersant is selected from one or both of f108 coating dispersant and 9250 dispersant.

[0025] In some embodiments, the defoaming agent is selected from a combination of one or more of BYK-066N defoaming agent, 5500 defoaming agent, and silicone defoaming agent.

[0026] In some embodiments, the water removing agent is selected from vinyl trimethoxysilane A-171.

[0027] In some embodiments, the catalyst is selected from a combination of one or more of organic tin NEOSTANN U-303, butyl tin dilaurate, stannous octoate, zinc isooctoate, bismuth isooctoate, bismuth neodecanoate, and zinc neodecanoate.

[0028] The present application further provides a method for preparing the polyurethane coating described above, the method comprising the step of mixing and dispersing the maleic anhydride modified polyurethane, the silane modified polyurethane, the maleic anhydride modified gum, and other raw materials to obtain the polyurethane coating.

[0029] In some embodiments, the method further comprises the step of preparing the maleic anhydride modified polyurethane: adding the polyol into a reaction kettle, heating to remove water, then adding maleic anhydride and a catalyst, and adding isocyanate dropwise to react, and testing the NCO content of the system, and when the NCO content of the system is less than 6.1%, the reaction is complete, and the maleic anhydride modified polyurethane is obtained.

[0030] In some embodiments, the dropwise adding time is 10-40 min.

[0031] In some embodiments, the heating is to a temperature of 80-130°C.

[0032] In some embodiments, the dehydration is to a water mass content of 0.05% or less.

[0033] In some embodiments, the method further comprises the step of preparing the silane modified polyurethane: adding the polyol into a reaction kettle, heating to remove water, then adding a silane coupling agent and a catalyst, and adding isocyanate dropwise to react, and testing the NCO content of the system, and when the NCO content of the system is less than 4.9%, the reaction is complete, and the silane modified polyurethane is obtained.

[0034] In some embodiments, the dropping time is 10-40 min.

[0035] In some embodiments, the heating temperature is 80-130℃.

[0036] In some embodiments, the dehydration is to a moisture mass content of 0.05% or less.

[0037] In some embodiments, the method further comprises a step of preparing the maleic anhydride modified gelatin: adding the gelatin into a reaction kettle, adding maleic anhydride and an initiator after heating, and then carrying out a reaction to obtain the maleic anhydride modified gelatin.

[0038] The present application further provides a use of the aforementioned polyurethane coating as an interlayer separator between a polyurethane coating and a bitumen waterproofing membrane.

[0039] The present application further provides a use of the aforementioned polyurethane coating as a primer for a concrete base. The polyurethane coating of the present application can also be used as a primer, which has very good adhesion to a concrete base, even to a wet base, and the adhesion strength between the coating formed by the polyurethane coating and the concrete base is higher than 2.5 MPa.

[0040] The present application further provides a waterproofing laminate, which comprises a base material layer, a polyurethane coating layer and a bitumen waterproofing membrane layer, and further comprises an interlayer separator layer between the polyurethane coating layer and the bitumen waterproofing membrane layer, wherein the interlayer separator layer is formed by the aforementioned polyurethane coating.

[0041] The present application further provides a method for preparing the aforementioned waterproofing laminate, which comprises the following steps: forming the polyurethane coating layer on the base material layer, coating the aforementioned polyurethane coating of the present application on the polyurethane coating layer, and bonding to the bitumen waterproofing membrane layer to form the interlayer separator layer, thereby obtaining the waterproofing laminate.

[0042] Preferably, the bitumen waterproofing membrane is selected from an SBS waterproofing membrane or an APP waterproofing membrane. The surfaces of these two types of waterproofing membranes do not have a separator film, and can be directly bonded to the interlayer separator layer.

[0043] Preferably, the bitumen waterproofing membrane is selected from a wet-laid waterproofing membrane or a self-adhesive polymer-modified bitumen waterproofing membrane. The surfaces of these two types of waterproofing membranes have a separator film, and the separator film needs to be removed to expose the bonding layer, and then the waterproofing membrane is bonded to the interlayer separator layer.

[0044] Further, the base material layer is a building surface.

[0045] Preferably, the building surface is a roof, a garage roof or a basement side wall.

[0046] Thanks to the use of the technical solution described above, the present application has the following advantages compared with the prior art:

[0047] The present application significantly enhances the bonding strength between the traditional polyurethane coating and the asphalt waterproofing membrane by compounding maleic anhydride modified polyurethane, maleic anhydride modified colloid and silane modified polyurethane, so that the traditional polyurethane can maintain good waterproof sealing even in complex and variable environments.

[0048] The present application makes the polyurethane a soft and hard grafted modified polyurethane by compounding maleic anhydride modified polyurethane, maleic anhydride modified colloid and silane modified polyurethane, so that a binding force is formed between the modified polyurethane and the waterproof asphalt membrane, which is beneficial to maintaining the binding force of the obtained material in weak acid / alkaline environment and is not prone to peeling off.

[0049] When the polyurethane coating of the present application is used as an interlayer spacing agent, it can improve the overall durability and sealing performance of the composite waterproof layer composed of the traditional polyurethane coating and the waterproof asphalt membrane, so that it can be widely used in waterproof treatment of roofing, underground structures and bridges and other engineering.

[0050] The polyurethane coating of the present application has excellent combination with various polar or non-polar coatings, concrete and the like, and is particularly suitable for application to basement side wall roll-coating composite waterproofing, and has excellent weather resistance and corrosion prevention effect.

[0051] The polyurethane coating of the present application has excellent sustained adhesion to the traditional polyurethane coating and other base layers, and the peeling strength with self-adhesive asphalt membrane is higher than 2.0 N / mm, is not afraid of water bubbles, can be immersed in water for a long time, meets the new strength requirements, and can be used for roll-coating composite waterproofing of underground engineering.

[0052] The polyurethane coating of the present application can also be used as a primer, which has very good adhesion to the concrete base, even to the wet base, and the bonding strength between the coating layer formed by the polyurethane coating and the concrete base material is higher than 2.5 MPa. The polyurethane coating of the present application is suitable for waterproofing of various substrates and various complex substrates, and has good water resistance, with adhesion strength of more than 80% after immersion in water. DETAILED DESCRIPTION

[0053] The technical solutions of the present application will be described in detail below with reference to specific embodiments, so that those skilled in the art can better understand and implement the technical solutions of the present application, but the present application is not limited in the scope of the described examples.

[0054] In the following examples, all raw materials are commercially available or prepared by conventional methods in the art, unless otherwise specified. TDI, MDI, HMDI and IPDI are purchased from Wanhua; polyether 2000 and polyether 1000, 330N, 3050 are purchased from Lansheng, Dongda, respectively; defoamer is BYK 066N; dispersant is Decon 9250; catalyst is organic tin NEOSTANN U-303; water-removing agent is vinyl trimethoxysilane A-171; No. 70 asphalt and petroleum resin are purchased from Sinopec; solvent is Valeron 150# aromatic hydrocarbon solvent. Example 1

[0055] This example provides a polyurethane coating that can be used as a primer or interlayer spacer, the raw material composition (mass parts) is shown in Table 1, and the preparation method is as follows:

[0056] 1) Preparation of maleic anhydride modified polyurethane: polyether polyol polyether 2000 is added to the reaction kettle, heated to 110°C for 2h or more, the moisture content is tested until it is below 0.05%, then the reaction kettle is cooled to 80°C, maleic anhydride and catalyst organic tin NEOSTANN U-303 are added at once, stirred for 20min, then TDI is added dropwise into the reaction kettle, which is completed within 20min, continue to stir, heat for 2h, test the NCO content by di-n-butylamine titration method, when it reaches 5.5%, the reaction is complete, stop stirring and discharge.

[0057] The mass ratio of polyether polyol, isocyanate TDI, maleic anhydride and catalyst is 65:22:3:0.01.

[0058] 2) Preparation of silane modified polyurethane: polyether polyol polyether 2000 is added to the reaction kettle, heated to 110°C for 2h or more, the moisture content is tested until it is below 0.05%, then the reaction kettle is cooled to 80°C, silane coupling agent KH550 and catalyst organic tin NEOSTANN U-303 are added at once, stirred for 20min, then TDI is added dropwise into the reaction kettle, which is completed within 20min, continue to stir, heat for 2h, test the NCO content by di-n-butylamine titration method, when it reaches 4.5%, the reaction is complete, stop stirring and discharge.

[0059] The mass ratio of polyether polyol, isocyanate TDI, silane coupling agent and catalyst is 70:17.3:5:0.01.

[0060] 3) Preparation of maleic anhydride modified colloid: add No. 70 asphalt and petroleum resin to the kneader, then heat to 90°C, add maleic anhydride and initiator dicumyl peroxide, dehydrate and knead under vacuum-0.1MPa for 2-4h until the moisture content is below 0.1%, stir for 30min and discharge.

[0061] The mass ratio of No. 70 asphalt, petroleum resin, maleic anhydride and initiator is 40:40:20:0.1.

[0062] 4) Each raw material in Table 1 is added to a reaction kettle, mixed, defoamed, dispersed and reacted to obtain a polyurethane coating material which can be used for a primer or an interlayer spacer. Example 2-5

[0063] This example provides a polyurethane coating material which can be used for a primer or an interlayer spacer, which is basically the same as Example 1, except that the raw material composition thereof is different from that of Example 1, and the specific composition thereof is shown in Table 1. Example 6

[0064] This example provides a polyurethane coating material which can be used for a primer or an interlayer spacer, which is basically the same as Example 1, except that the type of silane coupling agent in step 2) is replaced by KH560. Example 7

[0065] This example provides a polyurethane coating material which can be used for a primer or an interlayer spacer, which is basically the same as Example 1, except that the type of gum in step 3) is replaced by terpene resin. Comparative Example 1

[0066] This example provides a polyurethane coating material which can be used for a primer or an interlayer spacer, which is basically the same as Example 1, except that the polyurethane in step 2) is not modified by silane, i.e. no silane coupling agent is added in step 2). Comparative Example 2

[0067] This example provides a polyurethane coating material which can be used for a primer or an interlayer spacer, which is basically the same as Example 1, except that the polyurethane in step 1) is not modified by maleic anhydride, i.e. no maleic anhydride is added in step 1). Comparative Example 3

[0068] This example provides a polyurethane coating material which can be used for a primer or an interlayer spacer, which is basically the same as Example 1, except that the gum in step 3) is not modified by maleic anhydride, i.e. no maleic anhydride and initiator are added in step 3).

[0069] Table 1 Raw material composition of polyurethane coating material of each example

[0070]

[0071] The polyurethane coatings of Examples 1-7 and Comparative Examples 1-3 were tested for performance according to standard JC / T2254 Interlayer Treatment Agent for Spraying Polyurea / Q / 320584 PBT049 Interlayer Treatment Agent for Coating, in which the adhesion strength refers to the adhesion strength to the concrete substrate layer, and after immersion, according to standard GB16777. The peel strength to asphalt roll material was tested according to the following method: first, a conventional polyurethane was coated on the concrete substrate layer, then the polyurethane coating of the application was coated on the conventional polyurethane coating, and the asphalt roll material was bonded thereto, according to standard JC / T2254 Interlayer Treatment Agent for Spraying Polyurea / Q / 320584 PBT049 Interlayer Treatment Agent for Coating; after immersion and heat treatment, according to standard Q / 320584 PBT049 Interlayer Treatment Agent for Coating. The test results are shown in Table 2.

[0072] Table 2 Performance results of polyurethane coatings of various examples and comparative examples

[0073]

[0074] After immersion and heat treatment, the peel strength to asphalt roll material may be slightly improved compared to no treatment. The reason is that the water pressure during immersion and the heat melting during heat treatment are beneficial to better bonding between the two, and the peel strength increases.

[0075] As can be seen from Table 2, by compounding maleic anhydride modified polyurethane, maleic anhydride modified colloid and silane modified polyurethane, the adhesion strength between the conventional polyurethane coating and the asphalt waterproof roll material is significantly enhanced, and the adhesion strength as a concrete substrate primer is also increased.

[0076] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

[0077] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited. The ranges and values should be interpreted as being approximate. Values that are near to the recited values are also considered to be within the scope of the disclosed ranges and values. For numerical ranges having endpoints, the endpoints are included in the range. For numerical ranges having endpoints, the endpoints are included in the range.

Claims

1. A polyurethane coating, characterized in that: The polyurethane coating comprises the following components: maleic anhydride-modified polyurethane, silane-modified polyurethane, maleic anhydride-modified adhesive, and solvent; the maleic anhydride-modified polyurethane is obtained by reacting raw materials including polyol, maleic anhydride, isocyanate, and catalyst; the silane-modified polyurethane is obtained by reacting raw materials including polyol, silane coupling agent, isocyanate, and catalyst; the adhesive is selected from one or more combinations of petroleum resin, asphalt, rosin resin, terpene resin, styrene-butadiene rubber, and butyl rubber; the maleic anhydride-modified adhesive is obtained by reacting raw materials including maleic anhydride, adhesive, and initiator.

2. The polyurethane coating according to claim 1, characterized in that: The mass ratio of the maleic anhydride-modified polyurethane, silane-modified polyurethane, maleic anhydride-modified adhesive, and solvent is 10-35:10-30:12-25:28-40.

3. The polyurethane coating according to claim 1, characterized in that: The polyol is selected from polyether polyols or polyester polyols; and / or, the isocyanate is selected from one or more combinations of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and 4,4'-dicyclohexylmethane diisocyanate (HMDI); and / or, the silane coupling agent is selected from one or more combinations of WD50, KH550, KH560, KH570, and propyltriethoxysilane isocyanate (IPTS); and / or, the catalyst is selected from one or more combinations of organotin NEOSTANN U-303, butyltin dilaurate, stannous octoate, zinc isooctanoate, bismuth isooctanoate, bismuth neodecanoate, and zinc neodecanoate; and / or, the initiator is selected from azo initiators or organic peroxide initiators; and / or, the solvent is selected from one or more combinations of aromatic hydrocarbons, dimethyl carbonate, and butyl acetate.

4. The polyurethane coating according to claim 1, characterized in that: In the raw materials for maleic anhydride-modified polyurethane, the mass ratio of the polyol, maleic anhydride, isocyanate, and catalyst is 60-70:2-6:22-40:0.01-0.05; and / or, in the raw materials for silane-modified polyurethane, the mass ratio of the polyol, silane coupling agent, isocyanate, and catalyst is 65-75:3-7:17-25:0.01-0.05; and / or, in the raw materials for maleic anhydride-modified gum, the mass ratio of maleic anhydride, gum, and initiator is 15-25:75-85:0.05-0.

15.

5. The polyurethane coating according to claim 1, characterized in that: The polyurethane coating also includes dispersants, defoamers, dehydrating agents, and catalysts.

6. The polyurethane coating according to claim 5, characterized in that: The mass ratio of the maleic anhydride-modified polyurethane, silane-modified polyurethane, maleic anhydride-modified adhesive, solvent, dispersant, defoamer, dehydrating agent, and catalyst is 10-35:10-30:12-25:30-40:0.1-0.3:0.1-0.3:1-3:0.05-0.

1.

7. The polyurethane coating according to claim 5, characterized in that: The dispersant is selected from one or both of F108 coating dispersant and 9250 dispersant; and / or, the defoamer is selected from one or more of BYK-066N defoamer, 5500 defoamer and organosilicon defoamer; and / or, the dehydrating agent is selected from vinyltrimethoxysilane A-171; and / or, the catalyst is selected from one or more of organotin NEOSTANN U-303, butyltin dilaurate, stannous octoate, zinc isooctanoate, bismuth isooctanoate, bismuth neodecanoate and zinc neodecanoate.

8. A method for preparing the polyurethane coating according to any one of claims 1-7, characterized in that: The method includes the step of mixing and dispersing the maleic anhydride-modified polyurethane, silane-modified polyurethane, maleic anhydride-modified adhesive, and other raw materials to obtain the polyurethane coating.

9. The method according to claim 8, characterized in that: The method further includes the step of preparing the maleic anhydride-modified polyurethane: adding the polyol to a reaction vessel, heating for dehydration, then adding maleic anhydride and a catalyst, and adding isocyanate dropwise to react, testing the NCO content of the system, and when the NCO content of the system is less than 6.1%, the reaction is complete, and the maleic anhydride-modified polyurethane is obtained; and / or, the method further includes the step of preparing the silane-modified polyurethane: adding the polyol to a reaction vessel, heating for dehydration, then adding a silane coupling agent and a catalyst, and adding isocyanate dropwise to react, testing the NCO content of the system, and when the NCO content of the system is less than 4.9%, the reaction is complete, and the silane-modified polyurethane is obtained; and / or, the method further includes the step of preparing the maleic anhydride-modified adhesive: adding the adhesive to a reaction vessel, heating to a higher temperature, then adding maleic anhydride and an initiator, and reacting to obtain the maleic anhydride-modified adhesive.

10. Use of the polyurethane coating according to any one of claims 1-7 as an interlayer release agent between a polyurethane coating and an asphalt roll.

11. Use of the polyurethane coating according to any one of claims 1-7 as a primer for concrete substrates.

12. A waterproof laminate, the waterproof laminate comprising a substrate layer, a polyurethane coating, and an asphalt waterproof membrane layer, characterized in that: The waterproof laminate further includes an interlayer spacer layer located between the polyurethane coating and the bitumen waterproof membrane layer, the interlayer spacer layer being formed of the polyurethane coating as described in any one of claims 1 to 7.

13. The method for preparing the waterproof laminate according to claim 12, characterized in that: The preparation method includes the following steps: forming the polyurethane coating on the substrate layer, coating the polyurethane coating according to any one of claims 1-7 on the polyurethane coating, and bonding it to the asphalt waterproof membrane layer to form the interlayer spacer layer, thereby obtaining the waterproof laminate.

Images