Flame retardant modified asphalt and preparation method thereof

Abstract

The present invention relates to the technical field of modified asphalt materials, and proposes a flame retardant modified asphalt and a preparation method thereof. The flame retardant modified asphalt comprises the following components in parts by weight: 35-50 parts of base asphalt, 2-5 parts of smoke suppressant, 2-5 parts of coupling agent, 0.1-0.5 parts of organic phosphorus flame retardant, 1-3 parts of expandable graphite, 1-3 parts of nano-layered silicate clay, 1-3 parts of dispersion stabilizer, 6-12 parts of softening oil, 25-40 parts of filler, 3-8 parts of SBS, 2-6 parts of resin, and 5-8 parts of rubber powder. Through the above technical scheme, the problems of poor storage stability and low-temperature ductility of flame retardant modified asphalt in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of modified asphalt materials, and in particular to a flame retardant modified asphalt and a preparation method thereof. Background Art

[0002] Modified asphalt waterproofing membrane for construction is a kind of waterproofing membrane with asphalt as the matrix. Asphalt is flammable, it will melt, drip, flow, etc. when it burns, causing the fire to spread. In addition, the methane and other gases decomposed when asphalt burns will help combustion, further expanding the fire. Therefore, it is very necessary to carry out research on flame-retardant modified asphalt waterproofing membrane.

[0003] Flame retardant modified asphalt is made by adding flame retardants, smoke suppressants, etc. to base asphalt to improve the flame retardancy of asphalt. However, the compatibility of flame retardants, smoke suppressants, etc. with asphalt is poor, which leads to poor storage stability and low-temperature elongation of flame retardant modified asphalt. Therefore, how to improve the storage stability and low-temperature elongation of flame retardant modified asphalt is an urgent problem to be solved. Summary of the invention

[0004] The invention provides a flame retardant modified asphalt and a preparation method thereof, which solves the problems of poor storage stability and low-temperature ductility of the flame retardant modified asphalt in the prior art.

[0005] The technical solution of the present invention is as follows:

[0006] The invention proposes a flame retardant modified asphalt, comprising the following components by weight: 35-50 parts of base asphalt, 2-5 parts of smoke suppressant, 2-5 parts of coupling agent, 0.1-0.5 parts of organic phosphorus flame retardant, 1-3 parts of expandable graphite, 1-3 parts of nano-layered silicate clay, 1-3 parts of dispersant, 6-12 parts of softening oil, 25-40 parts of filler, 3-8 parts of SBS, 2-6 parts of resin, and 5-8 parts of rubber powder.

[0007] As a further technical solution, the dispersant is a mixture of dispersant FA 4644, dispersant PU 4015 and dispersant PX4300 in a mass ratio of 2:3:1.

[0008] As a further technical solution, the base asphalt includes one or both of No. 90 asphalt and No. 70 asphalt.

[0009] As a further technical solution, the smoke suppressant includes one or more of zinc borate, silicon dioxide, and calcium oxide.

[0010] As a further technical solution, the organophosphorus flame retardant includes one or more of the flame retardant DMMP, the flame retardant CEPPA, the flame retardant BDP, and the flame retardant RDP.

[0011] As a further technical solution, the filler includes one or more of vermiculite, aluminum hydroxide, magnesium hydroxide, and antimony trioxide.

[0012] As a further technical solution, the coupling agent includes one or more of a silane coupling agent, a titanate coupling agent, and a lignin coupling agent.

[0013] As a further technical solution, the softened oil includes one or more of engine oil, heavy oil, and lubricating oil with a flash point above 220°C.

[0014] As a further technical solution, the SBS includes one or more of SBS1302 and SBS1401.

[0015] As a further technical solution, the resin includes one or more of terpene resin, petroleum resin, epoxy resin, and phenolic resin.

[0016] As a further technical solution, the expandable graphite is flake expandable graphite with a particle size of 50 to 80 μm and a fixed carbon content of ≥95%.

[0017] As a further technical solution, the nano-layered silicate clay includes one or more of montmorillonite, laponite, and sepiolite.

[0018] The present invention also proposes a method for preparing the flame retardant modified asphalt, comprising the following steps:

[0019] S1. Mix the base asphalt and softening oil evenly, raise the temperature to 180°C, add smoke suppressant, coupling agent, expandable graphite, dispersant FA 4644, SBS, and resin under low-speed stirring, and stir for 90 to 120 minutes to obtain a primary mixture;

[0020] S2, adding rubber powder to the primary mixture, heating to 190°C and stirring for 150-200 minutes to obtain a mixture;

[0021] S3. Add filler, organophosphorus flame retardant, nano-layered silicate clay, dispersant PX 4300 and dispersant PU 4015 to the mixture, stir at 180° C. for 60 to 120 minutes to obtain flame retardant modified asphalt.

[0022] The invention also proposes the application of the flame retardant modified asphalt in waterproof roll materials.

[0023] The working principle and beneficial effects of the present invention are:

[0024] 1. In the present invention, a dispersant is added to the flame retardant modified asphalt, which significantly improves the low-temperature elongation performance and storage stability of the flame retardant modified asphalt, and solves the problem of poor storage stability and low-temperature elongation of the flame retardant modified asphalt in the prior art.

[0025] 2. In the present invention, when the mass ratio of FA 4644, PU 4015 and PX 4300 in the dispersant is 2:3:1, the obtained flame retardant modified asphalt not only has good low-temperature ductility and tensile properties, but also has good storage stability and high heat resistance.

[0026] 3. In the present invention, by optimizing the order of adding dispersants in the preparation method of flame retardant modified asphalt, when the order of adding dispersant FA 4644 in step S1 and dispersant PX 4300 and dispersant PU 4015 in step 3 is adopted, the flame retardant modified asphalt obtained has the best ductility, the smallest decrease in softening point, and greatly improved storage stability. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the following embodiments and comparative examples, the particle size of the flake expandable graphite is 50-80 μm, the fixed carbon content is ≥95%, the model is expandable graphite 95150100, and it is purchased from Qingdao Risheng Graphite Co., Ltd.

[0029] Example 1

[0030] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 1:1:1.

[0031] The preparation method thereof comprises the following steps:

[0032] S1. Mix No. 90 asphalt and engine oil evenly, raise the temperature to 180°C, add zinc borate, silane coupling agent KH-151, flake expandable graphite, dispersant PU 4015, dispersant FA 4644 and dispersant PX 4300, SBS1302, and terpene resin under low-speed stirring, and stir for 90 minutes to obtain a primary mixture;

[0033] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 150 min to obtain a mixture;

[0034] S3. Add vermiculite, organophosphorus flame retardant DMMP and montmorillonite to the mixture, stir at 180° C. for 60 min to obtain flame retardant modified asphalt.

[0035] Example 2

[0036] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 2:1:1.

[0037] The preparation method is the same as that of Example 1.

[0038] Example 3

[0039] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 3:2:1.

[0040] The preparation method is the same as that of Example 1.

[0041] Example 4

[0042] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 2:3:1.

[0043] The preparation method is the same as that of Example 1.

[0044] Example 5

[0045] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 2:3:2.

[0046] The preparation method is the same as that of Example 1.

[0047] Example 6

[0048] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is dispersant FA 4644.

[0049] The preparation method is the same as that of Example 1.

[0050] Example 7

[0051] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is dispersant PU 4015.

[0052] The preparation method is the same as that of Example 1.

[0053] Example 8

[0054] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is dispersant PX 4300.

[0055] The preparation method is the same as that of Example 1.

[0056] Example 9

[0057] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644 and dispersant PU 4015 in a mass ratio of 2:3.

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

[0059] Example 10

[0060] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant FA 4644 and dispersant PX 4300 in a mass ratio of 2:1.

[0061] The preparation method is the same as that of Example 1.

[0062] Embodiment 11

[0063] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant PU 4015 and dispersant PX 4300 in a mass ratio of 3:1.

[0064] The preparation method is the same as that of Example 1.

[0065] Comparative Example 1

[0066] A flame retardant modified asphalt comprises the following components in parts by weight: 35 parts of No. 90 asphalt, 2 parts of zinc borate, 2 parts of silane coupling agent KH-151, 0.1 parts of organophosphorus flame retardant DMMP, 1 part of flaky expandable graphite, 1 part of montmorillonite, 1 part of dispersant, 6 parts of engine oil, 25 parts of vermiculite, 3 parts of SBS1302, 2 parts of terpene resin, 5 parts of 40-mesh tire rubber powder, and the dispersant is a mixture of dispersant PU 4015 and dispersant PX 4300 in a mass ratio of 3:1.

[0067] The properties of the flame retardant modified asphalt obtained in Examples 1-11 and Comparative Example 1 are shown in the following table:

[0068] Table 1 Properties of flame retardant modified asphalt obtained in Examples 1-11 and Comparative Example 1

[0069] project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 5℃ elongation / cm 13.4 15.6 15.9 18.9 17.6 17.2 Softening point / ℃ 94.9 92.1 94.2 94.7 94.1 93.7 Storage stability / ℃ 4.7 2.2 2.1 1.5 1.9 2.4 project Example 7 Example 8 Example 9 Example 10 Embodiment 11 Comparative Example 1 5℃ elongation / cm 14.8 15.9 16.0 13.8 13.1 12.5 Softening point / ℃ 95.4 94.7 94.1 95.9 95.6 96.2 Storage stability / ℃ 3.1 2.6 2.5 3.9 4.5 5

[0070] Compared with the flame retardant modified asphalt of comparative example 1, although the softening point of the flame retardant modified asphalt of Examples 1-11 is slightly decreased, the 5°C elongation and storage stability are significantly improved, indicating that the addition of dispersant can significantly improve the low-temperature elongation performance and storage stability of the flame retardant modified asphalt. In Examples 1-11, the flame retardant modified asphalt of Example 4 has the highest 5°C ductility, the lowest storage stability temperature, and a relatively high softening point, indicating that when the mass ratio of FA 4644, PU 4015, and PX 4300 in the dispersant is 2:3:1, the obtained flame retardant modified asphalt not only has good low-temperature ductility and tensile properties, but also has good storage stability and high heat resistance. The applicant speculates that this is because: first, FA 4644, PU 4015, and PX 4300 are adsorbed on the surface of material particles, so that the flame retardant modified asphalt mixture is kept away due to electrostatic repulsion, thereby improving the low-temperature ductility and tensile properties of the modified asphalt; second, the dispersants FA 4644, PU 4015, and PX 4300 improve the rheological properties and compatibility of the system in a material combination manner, reduce the absorption of SBS to light components, indirectly increase the relative content of oil, reduce the viscosity of the modified asphalt, and thus reduce the high temperature performance; third, the dispersants FA 4644, PU 4015, and PX 4300 improve the rheological properties and compatibility of the system in a material combination manner, reduce the absorption of SBS to light components, indirectly increase the relative content of oil, reduce the viscosity of the modified asphalt, and thus reduce the high temperature performance; third, the dispersants FA 4644, PU 4015 and PX 4300 have high active matter content. A small amount of dispersant can significantly reduce the steric hindrance of the material, stagger the materials, form a highly stable dispersion system, and improve the storage stability of the flame retardant modified asphalt.

[0071] Example 12

[0072] A flame retardant modified asphalt, the formula of which is the same as that of Example 4, and the preparation method thereof comprises the following steps:

[0073] S1. Mix No. 90 asphalt and engine oil evenly, heat to 180°C, add zinc borate, silane coupling agent KH-151, flake expandable graphite, SBS1302, and terpene resin under low-speed stirring, and stir for 90 minutes to obtain a primary mixture;

[0074] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 150 min to obtain a mixture;

[0075] S3. Add vermiculite, organophosphorus flame retardant DMMP, montmorillonite, dispersant PU 4015, dispersant FA4644 and dispersant PX 4300 to the mixture, stir at 180° C. for 60 min, and obtain flame retardant modified asphalt.

[0076] Example 13

[0077] A flame retardant modified asphalt, the formula of which is the same as that of Example 4, and the preparation method thereof comprises the following steps:

[0078] S1. Mix No. 90 asphalt and engine oil evenly, heat to 180°C, add zinc borate, silane coupling agent KH-151, flake expandable graphite, dispersant PU 4015, SBS1302, and terpene resin under low-speed stirring, and stir for 90 minutes to obtain a primary mixture;

[0079] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 150 min to obtain a mixture;

[0080] S3. Add vermiculite, organophosphorus flame retardant DMMP, montmorillonite, dispersant FA 4644 and dispersant PX4300 to the mixture, stir at 180° C. for 60 min, and obtain flame retardant modified asphalt.

[0081] Embodiment 14

[0082] A flame retardant modified asphalt, the formula of which is the same as that of Example 4, and the preparation method thereof comprises the following steps:

[0083] S1. Mix No. 90 asphalt and engine oil evenly, raise the temperature to 180°C, add zinc borate, silane coupling agent KH-151, flake expandable graphite, dispersant PX 4300, SBS1302, and terpene resin under low-speed stirring, and stir for 90 minutes to obtain a primary mixture;

[0084] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 150 min to obtain a mixture;

[0085] S3. Add vermiculite, organophosphorus flame retardant DMMP, montmorillonite, dispersant PU 4015 and dispersant FA4644 to the mixture, stir at 180° C. for 60 min, and obtain flame retardant modified asphalt.

[0086] Embodiment 15

[0087] A flame retardant modified asphalt, the formula of which is the same as that of Example 4, and the preparation method thereof comprises the following steps:

[0088] S1. Mix No. 90 asphalt and engine oil evenly, raise the temperature to 180°C, add zinc borate, silane coupling agent KH-151, flake expandable graphite, dispersant FA 4644, SBS1302, and terpene resin under low-speed stirring, and stir for 90 minutes to obtain a primary mixture;

[0089] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 150 min to obtain a mixture;

[0090] S3. Add vermiculite, organophosphorus flame retardant DMMP, montmorillonite, dispersant PU 4015 and dispersant PX4300 to the mixture, stir at 180° C. for 60 min, and obtain flame retardant modified asphalt.

[0091] The properties of the flame retardant modified asphalt of Example 4 and Examples 12-15 are shown in the following table:

[0092] Table 2 Properties of flame retardant modified asphalt of Example 4 and Examples 12-15

[0093] project Example 4 Example 12 Example 13 Embodiment 14 Embodiment 15 5℃ elongation / cm 18.9 18.1 17.6 17.7 19.1 Softening point / ℃ 94.7 92.5 94.6 94.7 95.2 Storage stability / ℃ 1.5 1.7 1.4 1.4 0.8

[0094] It can be seen from the above table that among Example 4 and Examples 12-15, the flame retardant modified asphalt of Example 15 has the best low-temperature ductility, softening point and storage stability, and the only difference between Example 4 and Examples 12-15 is the different order of adding dispersants in the preparation method, which means that adding dispersant FA 4644 in step S1 and adding dispersant PX4300 and dispersant PU 4015 in step 3 can make more active groups in the dispersant combine with the matrix asphalt rubber, so as to better exert the modification effect of the dispersant on the flame retardant modified asphalt, so that the flame retardant modified asphalt obtained has the best ductility, the smallest decrease in softening point, and greatly improved storage stability.

[0095] Example 16

[0096] A flame retardant modified asphalt comprises the following components in parts by weight: 40 parts of No. 70 asphalt, 3 parts of silicon dioxide, 3 parts of titanate coupling agent 101, 0.3 parts of organic phosphorus flame retardant CEPPA, 2 parts of expandable graphite, 2 parts of laponite, 2 parts of dispersant, 8 parts of heavy oil, 30 parts of aluminum hydroxide, 5 parts of SBS1302, 4 parts of petroleum resin, and 7 parts of 60-mesh tire rubber powder. The dispersant is a mixture of dispersant FA4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 2:3:1. The preparation method thereof comprises the following steps:

[0097] S1. Mix No. 70 asphalt and heavy oil evenly, raise the temperature to 180°C, add silica, titanate coupling agent 101, expandable graphite, dispersant FA 4644, dispersant PU 4015, dispersant PX 4300, SBS1302, and petroleum resin under low-speed stirring, and stir for 100 minutes to obtain a primary mixture;

[0098] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 180 min to obtain a mixture;

[0099] S3. Add aluminum hydroxide, organic phosphorus flame retardant and laponite to the mixture, stir at 180° C. for 90 minutes to obtain flame retardant modified asphalt.

[0100] Embodiment 17

[0101] A flame retardant modified asphalt comprises the following components in parts by weight: 50 parts of No. 70 asphalt, 5 parts of calcium oxide, 5 parts of calcium lignin sulfonate, 0.5 parts of organic phosphorus flame retardant BDP, 3 parts of expandable graphite, sepiolite, 3 parts of dispersant, 12 parts of lubricating oil, 40 parts of magnesium hydroxide, 8 parts of SBS1401, 6 parts of epoxy resin, and 8 parts of 80-mesh tire rubber powder. The dispersant is a mixture of dispersant FA 4644, dispersant PU 4015, and dispersant PX 4300 in a mass ratio of 2:3:1. The preparation method thereof comprises the following steps:

[0102] S1. Evenly mix No. 70 asphalt and lubricating oil, raise the temperature to 180°C, add calcium oxide, calcium lignin sulfonate, expandable graphite, dispersant FA 4644, dispersant PU 4015, dispersant PX 4300, SBS1401, and epoxy resin under low-speed stirring, and stir for 120 minutes to obtain a primary mixture;

[0103] S2, adding tire rubber powder to the primary mixture, heating to 190° C. and stirring for 200 min to obtain a mixture;

[0104] S3. Add magnesium hydroxide, organophosphorus flame retardant BDP and sepiolite to the mixture, stir at 180° C. for 120 min to obtain flame retardant modified asphalt.

[0105] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flame retardant modified asphalt, characterized in that: The invention comprises the following components in parts by weight: 35-50 parts of base asphalt, 2-5 parts of smoke suppressant, 2-5 parts of coupling agent, 0.1-0.5 parts of organic phosphorus flame retardant, 1-3 parts of expandable graphite, 1-3 parts of nano-layered silicate clay, 1-3 parts of dispersant, 6-12 parts of softening oil, 25-40 parts of filler, 3-8 parts of SBS, 2-6 parts of resin and 5-8 parts of rubber powder; The dispersant is a mixture of dispersant FA 4644, dispersant PU 4015 and dispersant PX 4300 in a mass ratio of 2:3:

1.

2. The flame retardant modified asphalt according to claim 1, characterized in that: The base asphalt includes one or both of No. 90 asphalt and No. 70 asphalt.

3. The flame retardant modified asphalt according to claim 1, characterized in that: The smoke suppressant includes one or more of zinc borate, silicon dioxide and calcium oxide.

4. The flame retardant modified asphalt according to claim 1, characterized in that: The organic phosphorus flame retardant includes one or more of the flame retardant DMMP, the flame retardant CEPPA, the flame retardant BDP, and the flame retardant RDP.

5. The flame retardant modified asphalt according to claim 1, characterized in that: The filler includes one or more of vermiculite, aluminum hydroxide, magnesium hydroxide and antimony trioxide.

6. The flame retardant modified asphalt according to claim 1, characterized in that: The coupling agent includes one or more of a silane coupling agent, a titanate coupling agent, and a lignin coupling agent.

7. The flame retardant modified asphalt according to claim 1, characterized in that: Includes at least one of the following features: The softened oil includes one or more of engine oil, heavy oil, and lubricating oil with a flash point above 220°C; The SBS includes one or more of SBS1302 and SBS1401; The resin includes one or more of terpene resin, petroleum resin, epoxy resin and phenolic resin.

8. The method for preparing a flame retardant modified asphalt according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Mix the base asphalt and softening oil evenly, raise the temperature to 180°C, add smoke suppressant, coupling agent, expandable graphite, dispersant FA 4644, SBS, and resin under low-speed stirring, and stir for 90-120 minutes to obtain a primary mixture; S2, adding rubber powder to the initial mixture, heating to 190°C and stirring for 150-200 minutes to obtain a mixture; S3. Add filler, organophosphorus flame retardant, nano-layered silicate clay, dispersant PX 4300 and dispersant PU 4015 to the mixture, stir at 180° C. for 60 to 120 minutes to obtain flame retardant modified asphalt.

9. Use of the flame retardant modified asphalt according to any one of claims 1 to 7 or the flame retardant modified asphalt obtained by the preparation method according to claim 8 in waterproof membranes.