CN114085647B

CN114085647B - Modified asphalt coating material, method for preparing modified asphalt coating material and asphalt waterproof coiled material

Info

Publication number: CN114085647B
Application number: CN202210063323.XA
Authority: CN
Inventors: 李雄; 龚兴宇; 杨小育
Original assignee: Keshun Waterproof Technology Co Ltd
Current assignee: Keshun Waterproof Technology Co Ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-04-22
Anticipated expiration: 2042-01-20
Also published as: CN114085647A

Abstract

The application relates to the field of building waterproofing, and particularly discloses a modified asphalt coating material, a method for preparing the same and an asphalt waterproof coiled material, wherein the modified asphalt coating material comprises the following raw materials in parts by weight: 100 parts of base asphalt; 0.5-3 parts of an asphalt modifier; 40-50 parts of asphalt softening oil; 5-10 parts of SBS; 5-10 parts of SBR; 40-60 parts of rubber powder; 40-60 parts of powder; wherein the asphalt modifier is selected from one or more of trioctyl phosphate, triphenyl phosphate, tributyl phosphate, tert-butyl perbenzoate and acetyl tributyl citrate. The application provides a modified asphalt coating material in through adding the asphalt modifier, can effectively improve the compatibility between each component in the coating material, can make the durability and the low temperature flexibility of the asphalt waterproofing membrane who prepares obtain promote by a wide margin from this, and then satisfy the application demand in the waterproof field of building.

Description

Modified asphalt coating material, method for preparing modified asphalt coating material and asphalt waterproof coiled material

Technical Field

The application relates to the field of building waterproofing, in particular to a modified asphalt coating material, a method for preparing the modified asphalt coating material and an asphalt waterproof coiled material.

Background

The waterproof roll is mainly used for building walls, building basements, bottom plates, roofs, tunnels, highways, refuse landfills and the like, can be curled into a roll-shaped flexible building material product for resisting external rainwater and underground water permeation, is used as a leakage-free connection between an engineering foundation and a building, is a waterproof first barrier of the whole engineering, and plays a vital role in the whole engineering.

At present, asphalt waterproof coiled materials required by the domestic building waterproof industry generally expect that products still have ultrahigh bonding strength and low-temperature flexibility after long-term storage or long-term aging, because only coiled material products with the two properties can ensure that the products can well protect buildings after production, transportation, storage and construction, and ensure the service life of the waterproof layer and the buildings.

However, the durability, low-temperature flexibility and adhesion performance of the existing asphalt waterproof roll are generally poor, and the application requirements in the building waterproof field cannot be met.

Disclosure of Invention

In view of the above, the present application provides a modified asphalt coating material with better durability and low temperature flexibility, a method for preparing the modified asphalt coating material, and an asphalt waterproof coiled material.

The application provides in a first aspect a modified asphalt coating material, which comprises the following raw materials in parts by weight:

100 parts of base asphalt;

0.5-3 parts of an asphalt modifier;

40-50 parts of asphalt softening oil;

5-10 parts of SBS;

5-10 parts of SBR;

40-60 parts of rubber powder;

40-60 parts of powder;

wherein the asphalt modifier is selected from one or more of trioctyl phosphate, triphenyl phosphate, tributyl phosphate, tert-butyl perbenzoate and acetyl tributyl citrate.

According to any of the embodiments of the first aspect of the present application, the SBS is selected from a group consisting of a styrene-butadiene-styrene block copolymer having a star-shaped structure, preferably, the number average molecular weight of the styrene-butadiene-styrene block copolymer is 150000 to 450000, and more preferably, the styrene content of the styrene-butadiene-styrene block copolymer is 20% to 30%.

According to any one of the embodiments of the first aspect of the present application, the rubber powder is selected from tire rubber powder; and/or

The powder material is selected from one or more of heavy calcium, calcium carbonate and organic montmorillonite.

According to any embodiment of the first aspect of the present application, the rubber content in the tire rubber powder is 30% to 60%; and/or

The ash content of the tire rubber powder is 10-40%.

In a second aspect, the present application provides a method for preparing a modified asphalt coating material, comprising:

a melting step, namely heating a mixture of the matrix asphalt, an asphalt modifier and asphalt softening oil under a stirring state to completely melt the matrix asphalt to obtain a melt, wherein the asphalt modifier is selected from one or more of trioctyl phosphate, triphenyl phosphate, tributyl phosphate, tert-butyl perbenzoate and acetyl tributyl citrate;

and a dispersing step, namely adding SBS, SBR, rubber powder and powder into the melt, and stirring and dispersing uniformly at a raised temperature to obtain the modified asphalt coating material.

According to any embodiment of the second aspect of the present application, the temperature raising treatment in the melting step comprises raising the temperature of the mixture to 130-150 ℃ and then maintaining the temperature for 1-2 hours.

According to any embodiment of the second aspect of the present application, the dispersing step further comprises:

adding SBS and SBR into the melt, heating to 160-180 ℃ under a stirring state, and preserving heat for 1-1.5 h;

adding rubber powder, heating to 180-190 ℃ under a stirring state, and dispersing for 3-4 h;

adding the powder, and dispersing for 1-2 h at 180-190 ℃ to obtain the modified asphalt coating material.

The third aspect of the application provides an asphalt waterproof coiled material, which comprises the modified asphalt coating material provided by the first aspect of the application or the modified asphalt coating material prepared by the method provided by the second aspect of the application.

According to any one of the embodiments of the third aspect of the present application, the roll for waterproofing further comprises a main body base material layer and a separation protective layer,

the modified asphalt coating material is coated on the main body base material layer, and the isolation protective layer is coated on the surface of the modified asphalt coating material.

According to any embodiment of the third aspect of the present application, the main substrate layer is selected from a PE reinforced film and/or a polyester tire, and the barrier protective layer is selected from a PET single-sided release film.

According to any embodiment of the third aspect of the present application, the thickness of the main body base material layer is 0.05 to 0.11 mm; and/or

The thickness of the PET single-sided release film is 0.035-0.05 mm, and preferably, the release force of the PET single-sided release film is 0.1-0.5N/25 mm.

Compared with the prior art, the method has the following beneficial effects:

the application provides a modified asphalt coating material in through adding the asphalt modifier, can effectively prevent to coat the phase separation that leads to because polarity difference between each component in the material to improve the compatibility between the component, can make the durability and the low temperature flexibility of the asphalt waterproofing membrane who prepares obtain promote by a wide margin from this, and then satisfy the application demand in building waterproof field.

Detailed Description

In order to make the application purpose, technical solution and beneficial technical effects of the present application clearer, the present application is further described in detail with reference to the following embodiments. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present application and are not intended to limit the present application.

For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.

In the description herein, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive, and "a plurality" of "one or more" means two or more.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In each instance, the list is merely a representative group and should not be construed as exhaustive.

The inventor finds in the research process that the durability of the asphalt waterproof coiled material is mainly reflected in the heat resistance of a coiled material product, and the heat resistance of the coiled material product is mainly related to the heat resistance of the asphalt coating material. Accordingly, the present application is proposed to improve the heat resistance of asphalt coatings.

The first aspect of the embodiment of the application provides a modified asphalt coating material, which comprises the following raw materials in parts by weight: 100 parts of base asphalt; 0.5-3 parts of an asphalt modifier; 40-50 parts of asphalt softening oil; 5-10 parts of SBS; 5-10 parts of SBR; 40-60 parts of rubber powder; 40-60 parts of powder; wherein the asphalt modifier is selected from one or more of trioctyl phosphate, triphenyl phosphate, tributyl phosphate, tert-butyl perbenzoate and acetyl tributyl citrate.

The asphalt modifier selected by the application is added into the asphalt coating material, wherein the selected asphalt modifier of phosphate (trioctyl phosphate, triphenyl phosphate and tributyl phosphate) can effectively prevent phase separation caused by polarity difference among the components in the coating material, and can improve the compatibility and the dispersibility among the components. Because the asphalt coiled material coating material belongs to a heterogeneous material and the polarity difference among the components is obvious, the coating material is easy to phase separate to cause the performance attenuation of the coiled material after the artificial climate accelerated aging. By using the phosphate plasticizer, the intermolecular distance can be effectively increased, the intermolecular van der Waals force is weakened, and the coating material cannot easily generate the phenomenon of phase separation after being subjected to artificial climate accelerated aging, so that the asphalt coiled material can keep better aging resistance.

In the embodiment of the application, the selected tert-butyl perbenzoate and acetyl tributyl citrate asphalt modifier can also improve the compatibility among the components in the coating material due to the presence of nonpolar and polar components in the self structure. Therefore, the adhesion, low-temperature flexibility and durability of the coating material can be remarkably improved by adding the asphalt modifier, so that the asphalt waterproof coiled material prepared by using the coating material also has excellent adhesion, low-temperature flexibility and durability, and meanwhile, under the long-term thermal-oxidative aging condition, the peeling strength of an aluminum plate of the coiled material also has higher maintenance degree, so that the application requirement in the field of building waterproofing can be met.

In the embodiment of the present application, the type of the base asphalt is not particularly limited, and may be selected according to actual needs. In some embodiments, the base asphalt includes, but is not limited to, at least one of 70# asphalt or 90# asphalt.

In the embodiment of the present application, the type of the asphalt softening oil is not particularly limited, and may be selected according to actual needs. In some embodiments, the asphalt-softening oil includes, but is not limited to, at least one of rubber oil and waste motor oil.

In some embodiments, the asphalt modifier is selected from the group of modifiers consisting of phosphate esters including trioctyl phosphate, triphenyl phosphate, tributyl phosphate, and one or more of tert-butyl perbenzoate and acetyl tributyl citrate.

In the embodiment of the application, the selected phosphate asphalt modifier can effectively prevent phase separation caused by polarity difference among the components in the coating material, and can improve the compatibility and dispersibility among the components; the selected tert-butyl perbenzoate and acetyl tributyl citrate asphalt modifier has nonpolar and polar components in the structure, so that the compatibility among the components in the coating material can be improved, and the aims of improving the adhesion, low-temperature flexibility and durability of the asphalt coating material and the waterproof coiled material are favorably fulfilled.

In some embodiments, the SBS is selected from a styrene-butadiene-styrene block copolymer having a star structure, preferably, the styrene-butadiene-styrene block copolymer has a number average molecular weight of 150000 to 450000, and more preferably, the styrene content of the styrene-butadiene-styrene block copolymer is 20% to 30%.

In the embodiment of the present application, the type of the rubber powder is not particularly limited, and may be selected according to actual requirements.

In some embodiments, the rubber powder can be selected from tire rubber powder, preferably, the rubber content of the tire rubber powder is 30-60%, and more preferably, the ash content of the tire rubber powder is 10-40%.

In the embodiment of the present application, the type of the powder is not particularly limited, and may be selected according to actual requirements.

In some embodiments, the powder includes, but is not limited to, one or more of heavy calcium carbonate, and organo montmorillonite.

A second aspect of the embodiments herein provides a method for preparing a modified asphalt coating material, comprising:

s02, heating the mixture of the matrix asphalt, the asphalt modifier and the asphalt softening oil under a stirring state to melt the matrix asphalt completely to obtain a melt, wherein the asphalt modifier is one or more selected from trioctyl phosphate, triphenyl phosphate, tributyl phosphate, tert-butyl perbenzoate and acetyl tributyl citrate;

s04, a dispersing step, namely adding SBS, SBR, rubber powder and powder into the melt, and stirring and dispersing uniformly at a raised temperature to obtain the modified asphalt coating material.

In some embodiments, in the melting step S02, the heating process includes heating the mixture to 130-150 ℃ and then maintaining the temperature for 1-2 hours.

In some embodiments, the dispersing step S04 further includes:

s040, adding SBS and SBR into the melt, heating to 160-180 ℃ in a stirring state, and keeping the temperature for 1-1.5 h;

s042, adding rubber powder, heating to 180-190 ℃ in a stirring state, and dispersing for 3-4 h;

s044, adding the powder, and dispersing at 180-190 ℃ for 1-2 h to obtain the modified asphalt coating material.

The third aspect of the embodiments of the present application provides an asphalt waterproofing membrane, which includes the modified asphalt coating material provided by the first aspect of the embodiments of the present application or the modified asphalt coating material prepared by the method provided by the second aspect of the embodiments of the present application.

In some embodiments, the waterproof roll further comprises a main substrate layer and an isolation protection layer, wherein the modified asphalt coating material is coated on the main substrate layer, and the isolation protection layer is coated on the surface of the modified asphalt coating material.

In some embodiments, the main substrate layer may be selected from a PE reinforced film and/or a polyester tire, and preferably, the thickness of the main substrate layer is 0.05 to 0.11 mm.

In some embodiments, the release protective layer may be selected from PET single-sided release films; preferably, the thickness of the PET single-sided release film is 0.035-0.05 mm; more preferably, the release force of the PET single-sided release film is 0.1-0.5N/25 mm; further preferably, the PET single-sided release film is a transparent film layer coated by solvent-free silicone oil.

In some embodiments, a method for making an asphalt waterproofing membrane may include the steps of:

s2, blade-coating the modified asphalt coating material into the main body base material, forming, and adjusting the thickness to 1.5-2 mm;

and S4, extruding by using a metal press roller, respectively pressing the isolation protective layer above and below the modified asphalt coating material, and cooling to obtain the asphalt waterproof coiled material.

In the embodiment of the application, the asphalt modifier selected by the application is added into the modified asphalt coating material, and the asphalt modifier can effectively prevent phase separation caused by polarity difference among components in the coating material, improve the compatibility and the dispersibility among the components, effectively increase the distance among molecules, weaken the van der Waals force among the molecules and ensure that the coating material cannot easily generate the phenomenon of phase separation after undergoing artificial climate accelerated aging, so that the asphalt waterproof coiled material comprising the modified asphalt coating material has excellent overall performances such as adhesion, low-temperature flexibility and durability.

The present disclosure is more particularly described in the following examples that are intended as illustrative only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and the equipment used in the examples is commercially available.

Example 1

Modified asphalt coating material

The modified asphalt coating material comprises the following raw materials in parts by weight: 100 parts of No. 90 asphalt; 1.5 parts of trioctyl phosphate; 45 parts of rubber oil; SBS 8 portions; SBR (styrene butadiene rubber), 7 parts; 50 parts of tire rubber powder; 50 parts of heavy calcium carbonate.

(1) Mixing 90# asphalt, trioctyl phosphate and rubber oil according to a ratio, stirring the mixture at a rotating speed of 1000rpm, heating to 140-145 ℃, and preserving heat for 1.5 hours until the asphalt is completely melted;

(2) adding SBS and SBR into the mixture subjected to heat preservation in the step (1) according to the proportion, heating to 170-180 ℃, and preserving heat for 1.5 hours;

(3) adding tire rubber powder into the mixture subjected to heat preservation in the step (2) according to the proportion, heating to 170-180 ℃, and shearing and dispersing at the temperature for 2.5 hours at the rotating speed of 1000 rpm;

(4) and (4) adding coarse whiting powder into the mixture subjected to shearing dispersion in the step (3), and shearing dispersion for 1.5 hours at the rotating speed of 1000rpm at 180-190 ℃ to obtain the modified asphalt coating material.

Asphalt waterproof coiled material

An asphalt waterproof coiled material comprises a PE reinforced film, the modified asphalt coating material covered on the inner side of the PE reinforced film and a transparent PET single-sided release film covered outside the modified asphalt coating material.

Adding the modified asphalt coating material into a PE (polyethylene) reinforced film, molding and adjusting the thickness to 1.5 mm; and (3) extruding by using a metal compression roller, respectively pressing the transparent PET single-sided release film above and below the modified asphalt coating material, and cooling to obtain the asphalt waterproof coiled material.

Example 2

The preparation of the modified asphalt coating material and the asphalt waterproof coiled material are the same as those in example 1, except that the content of each component in the modified asphalt coating material is different from that in example 1, and the components in parts by weight are respectively as follows: 100 parts of No. 90 asphalt; 0.5 part of trioctyl phosphate; 40 parts of rubber oil; SBS 5 portions; SBR (styrene butadiene rubber), 5 parts; 40 parts of tire rubber powder; 40 parts of heavy calcium carbonate.

Example 3

The preparation of the modified asphalt coating material and the asphalt waterproof coiled material are the same as those in example 1, except that the content of each component in the modified asphalt coating material is different from that in example 1, and the components in parts by weight are respectively as follows: 100 parts of No. 90 asphalt; 3 parts of trioctyl phosphate; 50 parts of rubber oil; SBS, 10 parts; 10 parts of SBR; 60 parts of tire rubber powder; 60 parts of heavy calcium carbonate.

Example 4

The preparation of the modified asphalt coating material and the asphalt waterproof roll material are the same as those in example 1, except that the asphalt modifier in the modified asphalt coating material is replaced by triphenyl phosphate instead of trioctyl phosphate.

Example 5

The preparation of the modified asphalt coating material and the asphalt waterproof roll material were the same as in example 3, except that the asphalt modifier in the modified asphalt coating material was replaced with triphenyl phosphate from trioctyl phosphate.

Example 6

The preparation of the modified asphalt coating material and the asphalt waterproof roll material are the same as those in example 1, except that the asphalt modifier in the modified asphalt coating material is changed from trioctyl phosphate to tributyl phosphate.

Example 7

The preparation of the modified asphalt coating material and the asphalt waterproof roll material were the same as in example 3, except that the asphalt modifier in the modified asphalt coating material was changed from trioctyl phosphate to tributyl phosphate.

Example 8

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 1 except that the asphalt modifier in the modified asphalt coating material was changed from trioctyl phosphate to t-butyl perbenzoate.

Example 9

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 3 except that the asphalt modifier in the modified asphalt coating material was changed from trioctyl phosphate to t-butyl perbenzoate.

Example 10

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 1 except that the asphalt modifier in the modified asphalt coating material was changed from trioctyl phosphate to acetyl tributyl citrate.

Example 11

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 3 except that the asphalt modifier in the modified asphalt coating material was changed from trioctyl phosphate to acetyl tributyl citrate.

Comparative example 1

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 1 except that the modified asphalt coating material does not contain trioctyl phosphate as an asphalt modifier.

Comparative example 2

The preparation of the modified asphalt coating material and the asphalt waterproof coiled material are the same as those in example 2, except that the modified asphalt coating material does not contain trioctyl phosphate serving as an asphalt modifier.

Comparative example 3

The preparation of the modified asphalt coating material and the asphalt waterproof coiled material are the same as those in example 3, except that the modified asphalt coating material does not contain trioctyl phosphate which is an asphalt modifier.

Comparative example 4

The preparation of the modified asphalt coating material and the asphalt waterproof coiled material are the same as those in example 1, except that trioctyl phosphate serving as an asphalt modifier in the modified asphalt coating material is replaced by butyl benzyl phthalate.

Comparative example 5

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 1 except that trioctyl phosphate, an asphalt modifier in the modified asphalt coating material, was replaced with glycerol triacetate.

Comparative example 6

Preparation of modified asphalt coating material and asphalt waterproof coiled material the same as example 1 except that trioctyl phosphate, an asphalt modifier in the modified asphalt coating material, was replaced with N-ethyl-p-toluenesulfonamide.

Test section

The asphalt waterproofing membranes of examples 1 to 11 and comparative examples 1 to 6 were subjected to performance tests, and the results are shown in table 1 below.

TABLE 1

The test method comprises the following steps:

(1) low temperature flexibility test

Preparing samples and testing according to the 14 th part of the national standard GB/T328-2007 Experimental method for waterproof coiled materials for buildings; wherein the low temperature flexibility of the web is subjected to a limit test.

(2) Aluminum plate peel strength test

Preparing samples and testing according to the national standard GB 23441-2009 self-adhesive polymer modified asphalt waterproof coiled material; wherein the peel strength of the aluminum sheet of the coil stock takes the maximum value.

(3) Aging test

The aging test is to test the performance of the waterproof coiled material after heating and aging the waterproof coiled material by adopting a blast oven; wherein the aging temperature is 70 ℃, and the aging time is 7d and 28 d.

As can be seen from the comparison between examples 1 to 11 and comparative examples 1 to 3, when no asphalt modifier is added into the asphalt coating material, the low-temperature flexibility limit of the coiled material product before aging is only-25 ℃ to-28 ℃. After the asphalt modifier selected by the application, particularly the asphalt modifier of phosphate esters (trioctyl phosphate, triphenyl phosphate and tributyl phosphate) is added into the asphalt coating material, the coiled material product shows better low-temperature flexibility before aging, and the limit of the low-temperature flexibility of the coiled material can still be kept below-27 ℃ after 7d and 28d thermal oxidation aging. In the comparative examples 1, 2 and 3, under the condition of not using the asphalt modifier, the low-temperature flexibility of the aged coil product can not meet the standard technical requirement (less than or equal to-18 ℃), so that the asphalt modifier can be proved to improve the compatibility among the components of the coil coating material, and further improve the low-temperature flexibility of the coil. Meanwhile, after long-period aging, the asphalt modifier can effectively prevent phase separation among the components of the coating material of the coiled material due to polarity difference, so that the coiled material has excellent aging resistance and durability.

In addition, as can be seen from the comparison between examples 1 to 11 and comparative examples 1 to 3, the low temperature flexibility is greatly improved, and the peel strength of the aluminum sheet of the coil is also maintained at a high level. This shows that the aging resistance of the coiled material product can be remarkably improved by selecting the asphalt modifier of phosphate esters (trioctyl phosphate, triphenyl phosphate and tributyl phosphate). The acetyl tributyl citrate selected has nonpolar and polar components in the structure, so the compatibility among the components in the coating material can be improved, and the coiled material product can still keep better aging resistance.

Comparing and analyzing the examples 1 to 11 and the comparative examples 4 to 6, it can be seen that the aging resistance of the coiled material cannot be improved by the other types of modifiers selected in the comparative examples 4 to 6, but a large negative effect is caused (the low-temperature flexibility and the aluminum plate peel strength are poor after the modifier is used), which indicates that not all types of modifiers can be applied to the asphalt coating material, and the aging resistance of the asphalt coiled material can be obviously improved only by selecting a proper asphalt modifier.

In contrast, the selected tert-butyl perbenzoate asphalt modifier can promote the oxidation of asphalt due to the strong oxidation capacity, so that after the tert-butyl perbenzoate is added, the low-temperature flexibility attenuation degree of the coiled material is higher than that of other asphalt modifiers after the coiled material is aged by thermal oxidation, but the overall performance of the coiled material is still better than that of a coating material without the asphalt modifier and a corresponding asphalt waterproof coiled material.

Therefore, the asphalt waterproof coiled material provided by the application can keep higher product performance in the processes of production, transportation and storage and in the service process, and meets the application requirements in the field of building waterproofing.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The modified asphalt coating material is characterized by comprising the following raw materials in parts by weight:

100 parts of base asphalt;

0.5-3 parts of an asphalt modifier;

40-50 parts of asphalt softening oil;

5-10 parts of SBS;

5-10 parts of SBR;

40-60 parts of rubber powder;

40-60 parts of powder;

wherein the asphalt modifier is selected from tert-butyl perbenzoate and/or acetyl tributyl citrate; the powder material is selected from calcium carbonate and/or organic montmorillonite.

2. The modified asphalt coating of claim 1, wherein said SBS is selected from a star-structured styrene-butadiene-styrene block copolymer,

wherein the number average molecular weight of the styrene-butadiene-styrene block copolymer is 150000 to 450000; and/or

The styrene-butadiene-styrene block copolymer contains 20-30% of styrene.

3. The modified-asphalt coating material according to claim 1 or 2, wherein the rubber powder is selected from tire rubber powder.

4. The modified asphalt coating material of claim 3, wherein the rubber content in the tire rubber powder is 30-60%; and/or

The ash content of the tire rubber powder is 10-40%.

5. A method for preparing a modified asphalt coating material, comprising:

preparing a raw material in the weight portion of any one of claims 1 to 4;

a melting step, namely heating a mixture of the matrix asphalt, an asphalt modifier and asphalt softening oil under a stirring state to completely melt the matrix asphalt to obtain a melt, wherein the asphalt modifier is selected from tert-butyl perbenzoate and/or acetyl tributyl citrate;

6. The method according to claim 5, wherein the temperature raising treatment in the melting step comprises raising the temperature of the mixture to 130-150 ℃ and then maintaining the temperature for 1-2 hours.

7. The method of claim 5, wherein the step of dispersing further comprises:

adding powder, and dispersing for 1-2 h at 180-190 ℃ to obtain the modified asphalt coating material.

8. An asphalt waterproofing membrane comprising the modified asphalt coating material according to any one of claims 1 to 4 or the modified asphalt coating material produced by the method according to any one of claims 5 to 7.

9. The asphalt waterproofing membrane according to claim 8, wherein said waterproofing membrane further comprises a main body base material layer and a barrier protective layer,

10. The asphalt waterproofing membrane according to claim 9, wherein said main substrate layer is selected from a PE reinforcing film and/or a polyester batt, and said barrier protective layer is selected from a PET single-sided release film.

11. The asphalt waterproofing membrane according to claim 10, wherein the thickness of the main body base material layer is 0.05 to 0.11 mm; and/or

The thickness of the PET single-sided release film is 0.035-0.05 mm; and/or

The release force of the PET single-sided release film is 0.1-0.5N/25 mm.