WO2021022924A1 - Two-component normal-temperature non-cured-asphalt/polyurethane waterproof paint and preparation method therefor - Google Patents

Abstract

Disclosed are a two-component polyurethane/asphalt waterproof paint and a preparation method therefor. The waterproof paint comprises a component A and a component B, wherein the component A comprises a modified polyurethane prepolymer obtained by reacting a polyurethane prepolymer with first hydroxyl-terminated polybutadiene, wherein the polyurethane prepolymer is made by reacting a polyol and polyisocyanate; and the component B comprises petroleum asphalt, second hydroxyl-terminated polybutadiene, a secondary amine curing agent and/or a primary amine curing agent, wherein the first and second hydroxyl-terminated polybutadiene are respectively and independently selected from one of or a combination of more than one of a compound as shown in formula (I), and in the structure monomers of the formula, the monomer represented by a accounts for 10-30%, the monomer represented by b accounts for 50-70%, and the monomer represented by c accounts for 10-30%. The preparation method therefor involves: the waterproof paint is obtained by respectively preparing a component A and a component B, and then mixing same. The present invention can not only achieve a normal temperature non-curing effect, but can also achieve a good paint stability, thus maintaining a good dispersion uniformity at all times, and thus ensuring that the paint has stable properties, such as physical and mechanical properties.

Description

Two-component normal temperature non-curing bituminous polyurethane waterproof coating and preparation method thereof Technical field

The invention belongs to the field of building waterproofing, and specifically relates to a two-component normal temperature non-curing asphalt polyurethane waterproof coating and a preparation method thereof.

Background technique

Waterproof coating The coating applied on the base layer is cured to form a waterproof film with a certain strength, good extensibility, crack resistance, impermeability and weather resistance, and also has good temperature adaptability, simple operation and easy maintenance And maintenance. Compared with waterproof coiled material, waterproof coating has strong adaptability to the base layer, and the waterproof layer has no joints and is more reliable. Due to the above characteristics, waterproof coatings are one of the main waterproof materials often used in waterproof engineering.

The waterproof coatings currently used are generally emulsions or contain solvents, but solvents are gradually abandoned due to the need for environmental protection, and the solid content of water emulsions is low, and the thickness of each coating is limited by the curing conditions, and thick coating cannot be used. , Film formation requires multiple brushing, low efficiency and difficult to achieve better curing under humid conditions. In response to the above phenomenon, some people have proposed non-curing polyurethane waterproof coatings. For example, Chinese invention patent CN103923565B discloses a non-curing polyurethane waterproof coating, which is composed of the following raw materials by weight percentage: prepolymer 13-20%, asphalt 30-65%, latent curing agent 1.0-1.5%, compatibilizer 3-15%, thermoplastic elastomer 2-9%, powder filler 0-30%, the prepolymer is the reaction of polyether and isocyanate The thermoplastic elastomer is one or a mixture of butadiene and styrene co-clustering thermoplastic elastomer, polyolefin thermoplastic elastomer, chloroprene rubber, and styrene butadiene rubber, and the compatibility The agent is a block polyether surfactant, fatty acid polyoxyethylene ester, maleic anhydride and methacrylic acid, or a mixture of two or more. The block polyether surfactant is a propylene glycol block polyether or a polyether block The latent curing agent is oxazolidine type curing agent or imine type latent curing agent, and the oxazolidine type curing agent is 3-hydroxyethyl-1,3-oxazolidine or 2-isopropyl- 3-hydroxyethyl-1,3-oxazolidine, imine-type latent curing agent is ketimine, the polyether includes polyether glycol and polyether triol, based on the total amount of prepolymer, polyether 80-99% of ether glycol, 1-20% of isocyanate, balance of polyether triol.

However, although this patent achieves a good non-curing effect, in order to solve the poor compatibility of the polyurethane prepolymer and petroleum asphalt, a specific compatibilizer is added, but these compatibilizers will gradually segregate over time The problems that came out further caused the polyurethane prepolymer and petroleum asphalt to layer each other, which destroyed the physical and mechanical properties of the coating. On the one hand, it reduced the storage stability. Even if it has been applied to wall waterproofing, the gradually separated compatibilizer will still be reduced. The performance of waterproof coating, on the other hand, this waterproof coating is a one-component, it needs a latent curing agent to react in the presence of water to produce amine or alcohol amine and then react with isocyanate groups to cure, but after being applied to wall waterproofing, It takes a long time for it to absorb moisture in the air or concrete and cross-link, which not only delays the construction period, but also causes uneven cross-linking and insufficient cross-linking.

Summary of the invention

In view of this, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide an improved two-component normal temperature non-curing bituminous polyurethane waterproof coating, which can not only achieve the normal temperature non-curing effect, but also the coating stability It has good properties and can always maintain good dispersion uniformity to ensure the stability of the physical and mechanical properties of the coating.

The invention also provides a preparation method of the above two-component normal temperature non-curing bituminous polyurethane waterproof coating.

To solve the above technical problems, a technical solution adopted by the present invention is as follows:

A two-component polyurethane asphalt waterproof coating, comprising component A and component B. The A component contains a modified polyurethane prepolymer. The modified polyurethane prepolymer is composed of a polyurethane prepolymer and a first hydroxyl terminal. Polybutadiene is obtained by reaction, the polyurethane prepolymer is made by the reaction of polyol and polyisocyanate; the B component contains petroleum pitch, second hydroxyl-terminated polybutadiene, secondary amine curing agent and/or primary Amine curing agent;

Wherein the first hydroxy-terminated polybutadiene and the second hydroxy-terminated polybutadiene are each independently selected from one or more combinations of the compounds of formula (I),

Among the structural monomers in the formula, -CH ₂ -CH=CH-CH ₂ -in a accounts for 10-30%, -CH ₂ -CH(CH=CH ₂ )- in b accounts for 50-70%, c The -CH ₂ -CH=CH-CH ₂ -accounts for 10-30%.

According to some preferred aspects of the present invention, the number average molecular weight of the first hydroxyl-terminated polybutadiene and the second hydroxyl-terminated polybutadiene are 1000-3000, and the average functionality is 2-2.4, respectively.

According to some preferred and specific aspects of the present invention, the number average molecular weights of the first hydroxy-terminated polybutadiene and the second hydroxy-terminated polybutadiene are 2000-3000, respectively.

In some embodiments of the present invention, the number average molecular weight of the first hydroxyl-terminated polybutadiene and the second hydroxyl-terminated polybutadiene are 2500-3000, respectively. In some embodiments of the present invention, the number average molecular weight of the first hydroxyl-terminated polybutadiene and the second hydroxyl-terminated polybutadiene are 2600-3000, respectively. In some embodiments of the present invention, the number average molecular weights of the first hydroxyl-terminated polybutadiene and the second hydroxyl-terminated polybutadiene are 2700-3000, respectively. In some embodiments of the present invention, the number average molecular weights of the first hydroxy-terminated polybutadiene and the second hydroxy-terminated polybutadiene are respectively 2800-3000.

According to some preferred and specific aspects of the present invention, in the process of preparing the modified polyurethane prepolymer, the reaction temperature of the polyurethane prepolymer and the first hydroxyl-terminated polybutadiene is 80-90°C, It is more preferably 82-88°C.

According to some preferred and specific aspects of the present invention, in the process of preparing the modified polyurethane prepolymer, the reaction between the polyurethane prepolymer and the first hydroxyl-terminated polybutadiene is performed in an inert gas atmosphere. According to a specific aspect of the present invention, the inert gas may be nitrogen or the like.

According to some preferred aspects of the present invention, the NCO content of the modified polyurethane prepolymer is 8-11%.

According to some preferred aspects of the present invention, the feed mass ratio of the A component to the B component is 1:4-6.

According to some preferred aspects of the present invention, in terms of mass percentage, the B component comprises 30-50% petroleum pitch, 8-20% second hydroxyl-terminated polybutadiene, secondary amine curing agent and/or primary amine Curing agent 2-15%, also including filler 10-25%, plasticizer 15-30%, asphalt modifier 0.1-3%, high temperature assistant 0.1-3%, catalyst 0.1-3% and defoamer 0.1 -1%.

According to some specific aspects of the present invention, the petroleum pitch is selected from one or a combination of road No. 10, No. 70, No. 90, No. 100 and No. 200 asphalt.

According to some specific aspects of the present invention, the secondary amine curing agent and/or primary amine curing agent is selected from one or more of Xiangyuan Chemical's liquid ML-200, DMD230, MOEA, P-1000 and MOCA combination.

According to some specific aspects of the present invention, the filler is a combination of one or more selected from titanium dioxide, heavy calcium, kaolin and talc.

According to some specific aspects of the present invention, the plasticizer is selected from DINP, DIDP, chlorinated paraffin, dioctyl adipate, glycol benzoate, trioctyl phosphate and phenyl alkyl sulfonate. One or more combinations.

According to some specific aspects of the present invention, the asphalt modifier is polyethylene wax and/or polyacetamide wax.

According to some specific aspects of the present invention, the high temperature assistant is selected from one or more of fumed silica, gypsum whiskers, nano calcium carbonate, nano aluminum nitride, nano boron nitride and nano aluminum borate combination.

According to some specific aspects of the present invention, the catalyst is zinc isooctanoate, dibutyltin dilaurate or an organic amine catalyst.

According to some specific aspects of the present invention, the defoamer is one or a combination of polysiloxane defoamer, silicone defoamer, calcium oxide, magnesium oxide and calcium hydroxide. In some embodiments of the present invention, the defoamer is Deqian defoamer 6800, defoamer BYK066N, magnesium oxide and the like.

According to some specific aspects of the present invention, the polyol is at least one selected from the group consisting of polyether diols, polyester diols and polyether triols, preferably at least two, such as including but not limited to polyether Diol 2000, polyether triol 3050, polyether diol 1000, polyether triol 330N, etc.

According to some specific aspects of the present invention, the polyisocyanate is a combination of one or more selected from the group consisting of diisocyanate and its prepolymer, triisocyanate and its prepolymer, for example including but not limited to toluene diisocyanate (TDI ), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene diisocyanate (HDI), naphthyl diisocyanate (NDI) and many more.

Another technical solution provided by the present invention: a preparation method of the above-mentioned two-component polyurethane asphalt waterproof coating, the preparation method includes the following steps:

(1) Preparation of component A: the polyol is vacuum dehydrated and reacted with polyisocyanate at 70-90°C to form a polyurethane prepolymer, and then the polyurethane prepolymer is combined with the first hydroxyl-terminated polybutylene in a nitrogen atmosphere. Diene reaction, when the measured NCO content in the reaction mixture reaches the set value, the reaction is stopped, vacuum degassing, and component A is prepared;

(2) Preparation of component B: Weigh each raw material according to the formula, add petroleum pitch into the container, heat up to 110-130°C to add filler, heat up to 150-170°C for vacuum dehydration, add plasticizer, second end Hydroxy polybutadiene, cooling to 100-120℃, adding secondary amine curing agent and/or primary amine curing agent, asphalt modifier, high temperature assistant, cooling to 60-80℃, adding catalyst and defoamer, mixing Vacuum degassing to obtain component B;

(3) Preparation of waterproof coating: Weigh component A and component B according to the formula and mix and stir to make.

According to some preferred aspects of the present invention, in step (1), the set value is 8-11%.

Due to the adoption of the above technical solutions, the present invention has the following advantages compared with the prior art:

The present invention innovatively uses hydroxyl-terminated polybutadiene modified polyurethane prepolymer as component A, and then uses petroleum pitch mixed with hydroxyl-terminated polybutadiene, secondary amine curing agent and/or primary amine curing agent as component B Therefore, the two-component waterproof coating is formed, which not only realizes the effect of non-curing at room temperature, but also makes the polyurethane and petroleum asphalt have excellent compatibility and can be maintained for a long time, enhances the stability of the coating, and can always maintain a better uniform dispersion It can ensure that the physical and mechanical properties of the coating are stable and excellent; at the same time, the two-component waterproof coating of the present invention has a fast curing speed after mixing, and the crosslinking of the surface layer and the inner layer of the coating is thorough and uniform, which further ensures that the coating will last for a long time. The performance is stable during use.

detailed description

The above solutions are further described below in conjunction with specific embodiments; it should be understood that these embodiments are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited by the scope of the following embodiments; The implementation conditions can be further adjusted according to specific requirements, and the implementation conditions not specified are usually the conditions in the routine experiment. In the following examples, unless otherwise specified, all raw materials are commercially available or prepared by conventional methods in the art.

Example 1

This example provides a two-component normal temperature non-curing bituminous polyurethane waterproof coating, including component A and component B. The mass ratio of component A to component B is 1:5; the raw material of component A includes 100kg Dongda Polyether diol 2000, 30kg Dongda Polyether Triol 3050, 50kg BASF TDI80, 20kg of hydroxyl-terminated polybutadiene with a functionality of 2 and a number average molecular weight of 2800 (purchased from Evonik); Group B It includes 300kg of No. 70 petroleum pitch, 100kg of talc powder 1250 mesh, 200kg of DINP plasticizer produced by Taiwan United Chemicals, 130kg of hydroxyl-terminated polybutadiene with a functionality of 2 and a number average molecular weight of 2800 (purchased from Evonik) , Xiangyuan Chemical's curing agent MOCA 20kg, asphalt modifier polyethylene wax SLT 3kg, high temperature assistant meteorological silica 2kg, zinc isooctanoate 10kg, defoamer 6800 2kg;

The preparation method specifically includes:

Preparation of component A: In the reactor, add 100kg Dongda Polyether Diol 2000, 30kg Dongda Polyether Triol 3050, slowly heat up to 120 ℃ under stirring, vacuum dehydration 2h (vacuum- 0.095-0.1MPa), to less than five ten thousandths of the moisture content; reduce the temperature to 60℃, add 50kg BASF TDI80, and then control the temperature at 80±3℃, pass nitrogen protection under stirring for 2h, and then add 20kg of functional Hydroxyl-terminated polybutadiene with a degree of 2 and a number average molecular weight of 2800. The temperature is controlled at 85±3℃ to react for 1 hour, and then the NCO content of the prepolymer is measured. After reaching the set value of 9%, the reaction is stopped and the temperature is reduced to 60 ℃, vacuum degassing for 30 minutes, then discharge (vacuum degree -0.085-0.1MPa), it is obtained

Preparation of component B: Add 300kg of No. 70 petroleum pitch into the reaction kettle, gradually add 100kg of talc powder 1250 mesh at 120°C, heat up to 160°C and vacuum for dehydration for 1h, stop heating and add 200kg of DINP made by Taiwan United Chemical 30kg of hydroxy-terminated polybutadiene with a functionality of 2 and a number average molecular weight of 2800. When the temperature drops to 110℃, gradually add the curing agent MOCA 20kg, the asphalt modifier polyethylene wax SLT 3kg, and the high temperature additive meteorological dioxide 2kg of silicon, stirring and dispersing for 1 hour, cooling to 70℃, adding 10kg of catalyst zinc isooctanoate, adding 6800 2kg of defoaming agent, defoaming and stirring for 1-2 hours under a vacuum of -0.08MPa, and testing by the scraper fineness meter The material can be discharged when the fineness reaches 50um or less;

The above A and B components are mixed and stirred evenly according to the formula ratio to make a waterproof coating. The coating film test performance is as follows:

Example 2

This example provides a two-component normal temperature non-curing bituminous polyurethane waterproof coating, including component A and component B. The mass ratio of component A to component B is 1:5; the raw material of component A includes 110kg Dongda Polyether glycol 2000, 80kg BASF MDI, 10kg of hydroxy-terminated polybutadiene with a functionality of 2.2 and a number average molecular weight of 3000 (purchased from Evonik); component B includes No. 70 petroleum pitch 200kg, titanium dioxide 10kg, heavy calcium 1500 mesh, 80kg, 100kg DINP plasticizer produced by Taiwan Union Chemicals, 60kg of hydroxy-terminated polybutadiene (purchased from Evonik) with a functionality of 2.4 and a number average molecular weight of 3000, curing of Xiangyuan Chemical Agent ML200 40kg, asphalt modifier polyacetamide wax powder 5kg, high temperature additive nano calcium 3kg, dibutyl tin dilaurate 1kg, defoamer BYK066N 1kg.

The preparation method is as follows:

Preparation of component A: Add 110kg of Dongda Polyether Glycol 2000 into the reactor, slowly raise the temperature to 120℃ under stirring, and vacuum dehydration for 2h (vacuum degree -0.095-0.1MPa), to the moisture content of ten thousand Five points or less; lower the temperature to 60°C, add 80kg BASF MDI, then control the temperature at 80±3°C, pass nitrogen protection while stirring for 2h, and then add 10kg with a functionality of 2.2 and a number average molecular weight of 3000 Hydroxy-terminated polybutadiene, the temperature is controlled at 85±3℃ to react for 1h, and then the NCO content of the prepolymer is measured. After reaching the set value of 10.9%, the reaction is stopped, the temperature is reduced to 60℃, and the product is vacuumed and degassed for 30 minutes. Material (vacuum degree -0.085-0.1MPa), that is;

Preparation of component B: Add 200kg of No. 70 petroleum pitch into the reaction kettle, gradually add 10kg of titanium dioxide and 1500 mesh 80kg of heavy calcium to 120℃, heat up to 160℃ for vacuum dehydration for 1h, then stop heating, add 100kg of Taiwan Union The finished DINP plasticizer, 60kg of hydroxyl-terminated polybutadiene with a functionality of 2.4 and a number average molecular weight of 3000. When the temperature drops to 110℃, gradually add curing agent ML200-40kg, asphalt modifier polyacetamide wax powder 5kg, 3kg of high-temperature additive nano-calcium, stirring and dispersing for 1h, cooling to 70℃, adding 1kg of catalyst dibutyltin dilaurate, adding 1kg of defoamer BYK066N, defoaming and stirring for 1-2 hours under a vacuum below -0.08MPa , The material can be discharged when the fineness is below 50um by the scraper fineness tester;

The above A and B components are mixed and stirred evenly according to the formula ratio to make a waterproof coating. The coating film test performance is as follows:

Example 3

This example provides a two-component normal temperature non-curing bituminous polyurethane waterproof coating, including component A and component B. The mass ratio of component A to component B is 1:5; the raw material of component A includes 20kg Dongda Polyether glycol 2000, polyether triol 330N100kg, 40kg BASF HMDI, 20kg HDI, and 10kg of hydroxyl-terminated polybutadiene with a functionality of 2.4 and a number average molecular weight of 2900 (purchased from Evonik); component B Including 200kg of No. 200 petroleum pitch, 100kg of talc 1250 mesh, 20kg of heavy calcium 1500 mesh, 150kg of DINP plasticizer produced in Taiwan, 60kg of hydroxy-terminated polybutadiene with a functionality of 2.4 and a number average molecular weight of 2900 (purchase (From Evonik), Xiangyuan Chemical's curing agent ML200 40kg, asphalt modifier polyacetamide wax powder 1kg, polyethylene wax 2kg, high temperature assistant gypsum whisker 1kg, nano calcium carbonate 3kg, catalyst dibutyl tin dilaurate 1kg, 1kg of organic amine catalyst, 1kg of defoamer magnesium oxide added.

The preparation method is as follows:

Preparation of component A: In the reactor, add 20kg of Dongda Polyether Glycol 2000, Polyether Triol 330N 100kg, and slowly raise the temperature to 120℃ under stirring, and vacuum dehydration for 2h (vacuum degree -0.095-0.1 MPa) to less than five ten thousandths of the moisture content; reduce the temperature to 60°C, add 40kg BASF HMDI and 20kg HDI, and then control the temperature at 90±3°C, and pass nitrogen protection while stirring for 2h. Then 10kg of hydroxyl-terminated polybutadiene with a functionality of 2.4 and a number average molecular weight of 2900 was added, and the temperature was controlled at 85±3℃ to react for 1 hour, and then the NCO content of the prepolymer was measured. After reaching the set value of 9.5%, stop To react, cool down to 60°C, vacuum and degas for 30 minutes, then discharge (vacuum degree -0.085-0.1MPa), that's it;

Preparation of component B: add 200kg of No. 200 petroleum pitch into the reactor, gradually add 100kg of talc powder 1250 mesh and 1500 mesh 20kg when heated to 120℃, heat up to 160℃, vacuum dehydration for 1h, then stop heating and add 150kg Taiwan The DINP plasticizer, 60kg of hydroxy-terminated polybutadiene with a functionality of 2.4 and a number-average molecular weight of 2900 produced by Union Cheng, when the temperature drops to 110°C, gradually add 40kg of curing agent ML200, and asphalt modifier polyacetamide wax powder 1kg, polyethylene wax 2kg, high temperature assistant gypsum whisker 1kg, nano calcium carbonate 3kg, stirring and dispersing for 1h; cooling down to 70℃, adding 1kg of catalyst dibutyltin dilaurate, 1kg of organic amine catalyst, adding 1kg of defoamer magnesium oxide , Degas and stir for 1-2 hours under the vacuum degree below -0.08MPa, test the fineness with the scraper fineness meter to reach below 50um, and then discharge;

The above A and B components are mixed and stirred evenly according to the formula ratio to make a waterproof coating. The coating film test performance is as follows:

Comparative example 1

It is basically the same as Example 1, except that: Component A only uses polyurethane prepolymer and does not use hydroxyl-terminated polybutadiene modification.

Its coating film test performance is as follows:

The above-mentioned embodiments are only to illustrate the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement them accordingly, and cannot limit the scope of protection of the present invention. The equivalent changes or modifications made by the spirit essence should all be covered within the protection scope of the present invention.

Claims (23)

1. A two-component polyurethane asphalt waterproof coating, comprising component A and component B, characterized in that the mass ratio of said A component to said B component is 1:4-6;

   The A component comprises a modified polyurethane prepolymer, which is obtained by reacting the polyurethane prepolymer and the first hydroxyl-terminated polybutadiene at 80-90°C in an inert atmosphere, The NCO content of the modified polyurethane prepolymer is 8-11%, and the polyurethane prepolymer is made by the reaction of polyol and polyisocyanate;

   Calculated by mass percentage, the B component contains 30-50% petroleum pitch, 8-20% second hydroxyl-terminated polybutadiene, 2-15% secondary amine curing agent and/or primary amine curing agent, and filler 10-25%, plasticizer 15-30%, asphalt modifier 0.1-3%, high temperature assistant 0.1-3%, catalyst 0.1-3% and defoamer 0.1-1%;

   Wherein, the first hydroxy-terminated polybutadiene and the second hydroxy-terminated polybutadiene are independently selected from one or a combination of the compounds of formula (I),

   

   Among the structural monomers in the formula, -CH ₂ -CH=CH-CH ₂ -in a accounts for 10-30%, -CH ₂ -CH(CH=CH ₂ )- in b accounts for 50-70%, c The -CH ₂ -CH=CH-CH ₂ -accounts for 10-30%;

   The number average molecular weight of the first hydroxy-terminated polybutadiene and the second hydroxy-terminated polybutadiene are 1000-3000, and the average functionality is 2-2.4, respectively.
2. The two-component polyurethane asphalt waterproof coating according to claim 1, wherein the polyol is at least one selected from the group consisting of polyether diol, polyester diol and polyether triol; The polyisocyanate is a combination of one or more selected from diisocyanates and their prepolymers, triisocyanates and their prepolymers; the petroleum pitch is selected from road No. 10, No. 70, No. 90, No. 100 and One or more combinations of No. 200 asphalt; the secondary amine curing agent and/or primary amine curing agent is one selected from Xiangyuan Chemical's liquid ML-200, DMD230, MOEA, P-1000 and MOCA A combination of one or more; the filler is a combination of one or more selected from titanium dioxide, heavy calcium, kaolin and talc; the plasticizer is selected from DINP, DIDP, chlorinated paraffin, hexyl A combination of one or more of dioctyl diacid, glycol benzoate, trioctyl phosphate and phenyl alkylsulfonate; the asphalt modifier is polyethylene wax and/or polyacetamide wax The high temperature assistant is selected from one or more combinations of fumed silica, gypsum whiskers, nano calcium carbonate, nano aluminum nitride, nano boron nitride and nano aluminum borate; the catalyst is a different Zinc octoate, dibutyltin dilaurate or organic amine catalyst; the defoamer is one or more of polysiloxane defoamers, silicone defoamers, calcium oxide, magnesium oxide and calcium hydroxide The combination.
3. A two-component polyurethane asphalt waterproof coating, comprising component A and component B, characterized in that the component A contains a modified polyurethane prepolymer, and the modified polyurethane prepolymer is composed of a polyurethane prepolymer and The first hydroxyl-terminated polybutadiene is obtained by the reaction, the polyurethane prepolymer is made by the reaction of polyol and polyisocyanate; the B component includes petroleum pitch, the second hydroxyl-terminated polybutadiene, and a secondary amine curing agent And/or primary amine curing agent;

   Wherein the first hydroxy-terminated polybutadiene and the second hydroxy-terminated polybutadiene are each independently selected from one or more combinations of the compounds of formula (I),

   

   Among the structural monomers in the formula, -CH ₂ -CH=CH-CH ₂ -in a accounts for 10-30%, -CH ₂ -CH(CH=CH ₂ )- in b accounts for 50-70%, c The -CH ₂ -CH=CH-CH ₂ -accounts for 10-30%.
4. The two-component polyurethane asphalt waterproof coating of claim 3, wherein the number average molecular weight of the first hydroxyl-terminated polybutadiene and the second hydroxyl-terminated polybutadiene are respectively 1000-3000, and the average functional The degrees are 2-2.4.
5. The two-component polyurethane asphalt waterproof coating of claim 4, wherein the number average molecular weight of the first hydroxyl-terminated polybutadiene and the second hydroxyl-terminated polybutadiene are 2000-3000, respectively.
6. The two-component polyurethane asphalt waterproof coating according to claim 3, characterized in that, in the process of preparing the modified polyurethane prepolymer, the polyurethane prepolymer and the first hydroxyl-terminated polybutadiene The reaction temperature is 80-90°C.
7. The two-component polyurethane asphalt waterproof coating according to claim 6, wherein in the process of preparing the modified polyurethane prepolymer, the polyurethane prepolymer and the first hydroxyl-terminated polybutadiene The reaction temperature is 82-88°C.
8. The two-component polyurethane asphalt waterproof coating according to claim 3, characterized in that, in the process of preparing the modified polyurethane prepolymer, the polyurethane prepolymer and the first hydroxyl-terminated polybutadiene The reaction is carried out in an inert gas atmosphere.
9. The two-component polyurethane asphalt waterproof coating according to claim 3, wherein the NCO content of the modified polyurethane prepolymer is 8-11%.
10. The two-component polyurethane asphalt waterproof coating of claim 3, wherein the mass ratio of the A component to the B component is 1:4-6;

    Wherein, in terms of mass percentage, the B component contains 30-50% of petroleum pitch, 8-20% of the second hydroxyl-terminated polybutadiene, and 2-15% of secondary amine curing agent and/or primary amine curing agent It also includes 10-25% filler, 15-30% plasticizer, 0.1-3% asphalt modifier, 0.1-3% high-temperature assistant, 0.1-3% catalyst and 0.1-1% defoamer.
11. The two-component polyurethane asphalt waterproof coating according to claim 10, wherein the petroleum asphalt is one or more selected from road No. 10, No. 70, No. 90, No. 100 and No. 200 asphalt. combination.
12. The two-component polyurethane asphalt waterproof coating according to claim 10, characterized in that the secondary amine curing agent and/or primary amine curing agent is selected from Xiangyuan Chemical's liquid ML-200, DMD230, MOEA, P- A combination of one or more of 1000 and MOCA.
13. The two-component polyurethane asphalt waterproof coating of claim 10, wherein the filler is one or a combination of one or more selected from titanium dioxide, heavy calcium, kaolin and talc.
14. The two-component polyurethane asphalt waterproof coating according to claim 10, wherein the plasticizer is selected from DINP, DIDP, chlorinated paraffin, dioctyl adipate, glycol benzoate, triphosphate A combination of one or more of octyl ester and phenyl alkyl sulfonate.
15. The two-component polyurethane asphalt waterproof coating of claim 10, wherein the asphalt modifier is polyethylene wax and/or polyacetamide wax.
16. The two-component polyurethane asphalt waterproof coating of claim 10, wherein the high-temperature auxiliary agent is selected from the group consisting of fumed silica, gypsum whiskers, nano calcium carbonate, nano aluminum nitride, nano boron nitride and One or more combinations of nano aluminum borate.
17. The two-component polyurethane asphalt waterproof coating according to claim 10, wherein the catalyst is zinc isooctanoate, dibutyltin dilaurate or organic amine catalyst.
18. The two-component polyurethane asphalt waterproof coating of claim 10, wherein the defoamer is a polysiloxane defoamer, a silicone defoamer, calcium oxide, magnesium oxide, and calcium hydroxide. A combination of one or more.
19. The two-component polyurethane asphalt waterproof coating of claim 3, wherein the polyol is at least one selected from the group consisting of polyether glycol, polyester glycol and polyether triol; The polyisocyanate is a combination of one or more selected from the group consisting of diisocyanate and its prepolymer, triisocyanate and its prepolymer.
20. A method for preparing a two-component polyurethane asphalt waterproof coating according to any one of claims 1-19, characterized in that, the preparation method comprises the following steps:

    (1) Preparation of component A: the polyol is vacuum dehydrated and reacted with polyisocyanate at 70-90°C to form a polyurethane prepolymer, and then the polyurethane prepolymer and the first hydroxyl-terminated polybutyl Diene reaction, when the measured NCO content in the reaction mixture reaches the set value, stop the reaction, vacuum degassing, and prepare component A;

    (2) Preparation of component B: Weigh each raw material according to the formula, add petroleum pitch into the container, heat up to 110-130°C to add filler, heat up to 150-170°C for vacuum dehydration, add plasticizer, second end Hydroxy polybutadiene, cooling to 100-120℃, adding secondary amine curing agent and/or primary amine curing agent, asphalt modifier, high temperature assistant, cooling to 60-80℃, adding catalyst and defoamer, mixing Vacuum degassing to obtain component B;

    (3) Preparation of waterproof coating: Weigh component A and component B according to the formula and mix and stir to make.
21. The method for preparing a two-component polyurethane asphalt waterproof coating according to claim 20, wherein in step (1), the set value is 8-11%.
22. The method for preparing a two-component polyurethane asphalt waterproof coating according to claim 20, characterized in that, in step (2), the fineness of component B is controlled to be less than 50 μm.
23. The method for preparing a two-component polyurethane asphalt waterproof coating according to claim 20, wherein in step (3), the mass ratio of the A component to the B component is 1:4-6.