A low-smoke flame-retardant composite modified asphalt caulking glue and its preparation method

Abstract

The present invention discloses a low-smoke flame-retardant composite modified asphalt caulking glue and a preparation method thereof, relating to the technical field of chemical building materials. The raw materials for preparing the asphalt caulking glue include component A, component B, component C, component D, component E, component F and component G, wherein: component A is petroleum asphalt; component B is a flame retardant; component C is a coupling agent; component D is waste cooking oil; component E is a polymer; component F is desulfurized gypsum powder; and component G is waste asphalt mixture. The components are respectively proportioned by mass: component A is 50 to 70 parts, component B is 3-6 parts, component C is 1 to 2 parts, component D is 5 to 10 parts, component E is 5 to 10 parts, component F is 10 to 20 parts, and component G is 5 to 15 parts. The asphalt caulking glue provided by the present invention has the advantages of good high-temperature heat resistance, excellent low-temperature flexibility, high bonding strength, environmental protection and energy saving in production and use process, and the melting temperature of the developed product is lower than that of traditional caulking glue, saving energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical building materials, and in particular relates to a low-smoke and flame-retardant composite modified asphalt caulking adhesive and a preparation method thereof. Background Art

[0002] Cracks are common defects in pavements and other cement concrete structures and need to be repaired promptly. Otherwise, the following problems may occur: (1) External water enters the concrete through cracks, and the chloride ions or sulfate ions in the water corrode the concrete; (2) External water enters the concrete through cracks, and alternating low and high temperatures cause freeze-thaw damage to the concrete; (3) Cracks expand, resulting in greater structural defects; (4) If the cracks are pavement cracks, driving comfort and safety will be affected.

[0003] Traditional composite modified asphalt caulking glue is a composite modified petroleum asphalt made of waste rubber powder and SBS (styrene-butadiene-styrene block copolymer). It has the following problems: (1) Poor high temperature resistance. When the road surface temperature reaches above 60℃ in hot summer areas, the caulking glue tends to become wider and thinner or become sticky and carried away by tires. (2) Poor low temperature flexibility. Traditional caulking glue has no cracks or breaks at -5℃, but it tends to crack and break brittlely when the temperature reaches -10℃ or lower in cold winter areas. (3) Low bonding strength. The bonding strength to cracks is low, and it is easily carried away by vehicles when it comes into contact with water. (4) Poor environmental protection and energy saving during production and use. In addition to asphaltene and resin, the main components of the base petroleum asphalt also contain a small amount of volatile substances such as benzene, naphthalene, anthracene, phenanthrene, pyridine, acridine, carbazole and phenol. Continuous high temperature will release a large amount of complex asphalt smoke, causing environmental pollution. The entire production process of traditional products takes at least 3 hours, and the temperature needs to be heated to between 180℃ and 220℃ during use. The melting time is about 2 hours. The long-term high temperature causes serious aging of the asphalt, reducing the low-temperature crack resistance and durability of the caulking glue. In addition, the energy consumption is high, the construction speed is slow, and the road traffic control time is long, which seriously affects the road traffic efficiency. Summary of the Invention

[0004] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a low-smoke flame-retardant composite modified asphalt caulking glue that meets one or more of the above-mentioned requirements.

[0005] The second purpose of the present invention is to provide a method for preparing a low-smoke flame-retardant composite modified asphalt caulking glue.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] A low-smoke flame-retardant composite modified asphalt caulking adhesive, the raw materials for preparing the caulking adhesive include component A, component B, component C, component D, component E, component F and component G, wherein:

[0008] Component A is petroleum asphalt;

[0009] Component B is a flame retardant;

[0010] Component C is a coupling agent;

[0011] Component D is waste cooking oil;

[0012] Component E is a polymer;

[0013] Component F is desulfurized gypsum powder;

[0014] Component G is waste asphalt mixture;

[0015] The mass proportions of the components are as follows: component A is 50-70 parts, component B is 3-6 parts, component C is 1-2 parts, component D is 5-10 parts, component E is 5-10 parts, component F is 10-20 parts, and component G is 5-15 parts.

[0016] As a preferred embodiment, the raw materials for preparing the caulking glue are composed of component A, component B, component C, component D, component E, component F and component G. A total of 7 components A, B, C, D, E, F, and G are heated at high temperature, sheared, developed, and mixed in a stirring and mixing equipment.

[0017] As a preferred solution, the petroleum asphalt is one of 70# petroleum asphalt and 90# petroleum asphalt.

[0018] As a preferred solution, the flame retardant is a composite of antimony trioxide and expandable graphite in a mass percentage ratio of 2:1.

[0019] As a preferred embodiment, the coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0020] As a preferred solution, the waste cooking oil is first-grade waste oil.

[0021] As a preferred solution, the polymer is a composite of linear SBS (styrene-butadiene-styrene block copolymer) and TPU (thermoplastic polyurethane elastomer rubber) in a mass percentage of 5:2.

[0022] As a preferred solution, the particle size of the desulfurized gypsum powder is less than 45 μm.

[0023] As a preferred solution, the particle size of the waste asphalt mixture ranges from 100 μm to 300 μm.

[0024] A method for preparing a low-smoke flame-retardant composite modified asphalt joint filling glue comprises the following steps:

[0025] S1. Premixing of components B and C: Weigh the two substances in component B in proportion, add them to a high-speed mixer, start the high-speed mixer and maintain the speed at 100-150 rpm / min, open the dropping funnel containing component C, add component C dropwise over 5-6 minutes, increase the speed of the high-speed mixer to 300-400 rpm / min, and continue stirring for 10 minutes to complete the premixing of components B and C;

[0026] S2. Dehydration of component F: Spread component F evenly on a sample plate and dehydrate in a drying oven at 100°C to constant weight;

[0027] S3, Mixed:

[0028] Heat component A to 135°C in a drying oven and add it into the reactor;

[0029] Turn on the frame agitator at a speed of 100-150 rpm / min, then heat component A to 165-175°C, add the premix of components B and C, and stir for 5 minutes;

[0030] Add component D, maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100~150 rpm / min, and stir for 5 minutes;

[0031] Add component E, maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100~150 rpm / min, turn on the high-speed shear, the high-speed shear speed at 5000~6000 rpm / min, and stir and shear for 45 minutes;

[0032] Turn off the high-speed shearing machine, add component F, maintain the temperature of the material in the reactor at 165℃~175℃, and the frame stirring speed at 300~400rpm / min, and stir for 15 minutes;

[0033] Add component G, maintain the material temperature in the reactor at 165°C~175°C, the frame stirring speed at 300~400 rpm / min, and stir for 20 minutes to obtain a low-smoke flame-retardant composite modified asphalt caulking adhesive.

[0034] The beneficial effects of the present invention are:

[0035] 1. Using petroleum asphalt as a film-forming material, in order to reduce the smoke density of petroleum asphalt and increase the polar oxygen index, antimony trioxide and expandable graphite composite flame retardant treated with γ-(2,3-epoxypropoxy)propyltrimethoxysilane are added to improve the environmental protection and safety flame retardancy of the caulking glue during processing and use; the use of first-class waste grease improves the low-temperature plasticity of petroleum asphalt, improves the low-temperature crack resistance of the caulking glue, reduces the melting temperature of the caulking glue, saves construction time, and provides a new way to apply waste oil in a high-value way; adding linear SBS (styrene-butadiene-styrene block copolymer) and TPU (thermoplastic polyurethane elastomer rubber) compounds improves the high and low temperature performance and Adhesive properties; Desulfurized gypsum powder is a kind of solid waste. When used in inorganic cementitious materials, it has the disadvantage of becoming soft when exposed to water. However, when used as a modifier for petroleum asphalt, the petroleum asphalt wraps it, which improves the waterproofness of the desulfurized gypsum powder and enhances the wear resistance and high temperature resistance of the caulking glue, and also broadens the comprehensive utilization of the desulfurized gypsum powder; waste asphalt mixture is a large amount of solid waste on the pavement. Adding it to petroleum asphalt can soften and activate the aged asphalt on the surface of the waste asphalt mixture, and enhance the compatibility of the waste asphalt mixture with petroleum asphalt. The waste asphalt mixture is dispersed in petroleum asphalt to replace aggregates such as quartz sand, which improves the wear resistance and compressive strength of the caulking glue, and just makes up for the limitation of excessive fine aggregate recycling in traditional waste asphalt mixture.

[0036] 2. The prepared low-smoke flame-retardant composite modified asphalt caulking glue and its preparation method have the following advantages compared with the traditional composite modified petroleum asphalt caulking glue: (1) The processing speed is 1 times faster, shortened from 3 hours to 1.5 hours; (2) Because the construction melting temperature is about 20°C lower, the construction time is 1 times faster, shortened from 2 hours to 1 hour; (3) Good flame retardancy reduces asphalt smoke emissions; (4) High-temperature heat resistance, low-temperature crack resistance, bonding strength, etc. are superior; (5) Comprehensive utilization of waste such as gutter oil, desulfurized gypsum powder, and waste asphalt mixture reduces the cost of raw materials by 20%. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention, the specific embodiments of the present invention are described below. The following examples further illustrate the content of the present invention, but should not be understood as limiting the present invention. Example 1

[0038] The preparation method of a low-smoke flame-retardant composite modified asphalt caulking adhesive of this embodiment specifically includes the following steps:

[0039] Premixing of S1, component B and component C: Add 2.67 parts of antimony trioxide and 1.33 parts of expandable graphite into a high-speed mixer, start the high-speed mixer and maintain the speed at 100 rpm / min, open the dropping funnel containing 1 part of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, complete the dropwise addition of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in 5 to 6 minutes, increase the speed of the high-speed mixer to 300 rpm / min, and continue stirring for 10 minutes to complete the premixing of antimony trioxide, expandable graphite and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0040] Dehydration of components S2 and F: Spread the desulfurized gypsum powder evenly on a sample plate and dehydrate it in a drying oven at 100°C to a constant weight. Weigh 15 parts of the desulfurized gypsum powder and place it in a desiccator for later use.

[0041] S3, Mixed:

[0042] Heat 70# petroleum asphalt to 135°C in a drying oven and add 56 parts into the reactor;

[0043] Turn on the frame stirrer at a speed of 100 rpm / min, then heat 70# petroleum asphalt to 165°C~175°C, add 5 parts of the premix of antimony trioxide, expandable graphite, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and stir for 5 minutes;

[0044] Add 8 parts of first-grade waste oil, maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100 rpm / min, and stir for 5 minutes;

[0045] Add 4.29 parts of linear SBS (styrene-butadiene-styrene block copolymer) and 1.71 parts of TPU (thermoplastic polyurethane elastomer rubber), maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100 rpm / min, turn on the high-speed shear, the high-speed shear speed at 5000 rpm / min, and stir and shear for 45 minutes;

[0046] Turn off the high-speed shearing machine, add 15 parts of desulfurized gypsum powder with a particle size of less than 45 μm, maintain the material temperature in the reactor at 165°C~175°C, and the frame stirring speed at 300 rpm / min, and stir for 15 minutes;

[0047] Add 10 parts of waste asphalt mixture with a particle size range of 100μm to 300μm, maintain the material temperature in the reactor at 165℃ to 175℃, stir at a frame stirrer speed of 300rpm / min, and stir for 20 minutes. This will produce a low-smoke, flame-retardant composite modified asphalt joint sealant. Example 2

[0048] The preparation method of a low-smoke flame-retardant composite modified asphalt caulking adhesive of this embodiment specifically includes the following steps:

[0049] Premix S1, component B and component C: add 3.34 parts of antimony trioxide and 1.66 parts of expandable graphite into a high-speed mixer, start the high-speed mixer and maintain the speed at 100 rpm / min, open the dropping funnel containing 1 part of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, complete the dropwise addition of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in 5 to 6 minutes, increase the speed of the high-speed mixer to 300 rpm / min, and continue stirring for 10 minutes to complete the premix of antimony trioxide, expandable graphite and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0050] Dehydration of components S2 and F: Spread the desulfurized gypsum powder evenly on a sample plate and dehydrate it in a drying oven at 100°C to a constant weight. Weigh 10 parts of the desulfurized gypsum powder and place it in a desiccator for later use.

[0051] S3, Mixed:

[0052] Heat 70# petroleum asphalt to 135°C in a drying oven and add 57 parts into the reactor;

[0053] Turn on the frame stirrer at a speed of 100 rpm / min, then heat 70# petroleum asphalt to 165°C~175°C, add 6 parts of the premix of antimony trioxide, expandable graphite, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and stir for 5 minutes;

[0054] Add 9 parts of first-grade waste oil, maintain the temperature of the material in the reactor at 165°C~175°C, stir at a frame stirring speed of 100 rpm / min, and stir for 5 minutes;

[0055] Add 5.72 parts of linear SBS (styrene-butadiene-styrene block copolymer) and 2.28 parts of TPU (thermoplastic polyurethane elastomer rubber), maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100 rpm / min, turn on the high-speed shear, the high-speed shear speed at 5000 rpm / min, and stir and shear for 45 minutes;

[0056] Turn off the high-speed shearing machine, add 10 parts of desulfurized gypsum powder with a particle size of less than 45 μm, maintain the material temperature in the reactor at 165°C~175°C, and the frame stirring speed at 300 rpm / min, and stir for 15 minutes;

[0057] Add 10 parts of waste asphalt mixture with a particle size range of 100μm to 300μm, maintain the material temperature in the reactor at 165℃ to 175℃, stir at a frame stirrer speed of 300rpm / min, and stir for 20 minutes. This will produce a low-smoke, flame-retardant composite modified asphalt joint sealant. Example 3

[0058] The preparation method of a low-smoke flame-retardant composite modified asphalt caulking adhesive of this embodiment specifically includes the following steps:

[0059] Premixing of S1, component B and component C: Add 4.00 parts of antimony trioxide and 2.00 parts of expandable graphite into a high-speed mixer, start the high-speed mixer and maintain the speed at 100 rpm / min, open the dropping funnel containing 2 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, complete the dropwise addition of γ-(2,3-epoxypropoxy)propyltrimethoxysilane in 5 to 6 minutes, increase the speed of the high-speed mixer to 300 rpm / min, and continue stirring for 10 minutes to complete the premixing of antimony trioxide, expandable graphite and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0060] Dehydration of components S2 and F: Spread the desulfurized gypsum powder evenly on a sample plate and dehydrate it in a drying oven at 100°C to a constant weight. Weigh 15 parts of the desulfurized gypsum powder and place it in a desiccator for later use.

[0061] S3, Mixed:

[0062] Heat 70# petroleum asphalt to 135°C in a drying oven and add 52 parts into the reactor;

[0063] Turn on the frame stirrer at a speed of 100 rpm / min, then heat 70# petroleum asphalt to 165°C~175°C, add 8 parts of the premix of antimony trioxide, expandable graphite, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and stir for 5 minutes;

[0064] Add 10 parts of first-grade waste oil, maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100 rpm / min, and stir for 5 minutes;

[0065] Add 7.15 parts of linear SBS (styrene-butadiene-styrene block copolymer) and 2.85 parts of TPU (thermoplastic polyurethane elastomer rubber), maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100 rpm / min, turn on the high-speed shear, the high-speed shear speed at 5000 rpm / min, and stir and shear for 45 minutes;

[0066] Turn off the high-speed shearing machine, add 15 parts of desulfurized gypsum powder with a particle size of less than 45 μm, maintain the material temperature in the reactor at 165°C~175°C, and the frame stirring speed at 300 rpm / min, and stir for 15 minutes;

[0067] Add 5 parts of waste asphalt mixture with a particle size range of 100μm to 300μm, maintain the material temperature in the reactor at 165℃ to 175℃, stir at a frame stirrer speed of 300rpm / min, and stir for 20 minutes. This will produce a low-smoke, flame-retardant composite modified asphalt caulking adhesive.

[0068] The test results of a low-smoke flame-retardant composite modified asphalt caulking adhesive prepared in Examples 1-3 are as follows:

[0069] As can be seen from the above table, the low-smoke flame-retardant composite modified asphalt caulking glue of the present invention has the following advantages over traditional caulking glue: (1) Excellent high-temperature heat resistance. The heat resistance of the products developed in Examples 1-3 all meet the requirement of no sliding and no flowing of the coating at 100°C, compared with the 60°C no sliding and no flowing of the traditional caulking glue. Even in hot summer areas where the road surface temperature reaches up to about 80°C, it will not be carried away by the tire. (2) Excellent low-temperature flexibility. The low-temperature flexibility of the products developed in Examples 2-3 meets the requirement of no cracks and no breaks at -10°C and -15°C, respectively. Compared with the traditional caulking glue, no cracks and no breaks at -5°C, the products developed in Examples 2-3 have better low-temperature crack resistance in cold winter areas. (3) High bonding strength. The bonding strength of the products developed in Examples 1-3 is 0.5MPa, 0.6MPa, and 0.6MPa, respectively, which is 25% to 50% higher than the 0.4MPa of the traditional caulking glue, and has better bonding effect with cracks in the original road surface or concrete plane. (4) The production and use process is environmentally friendly and energy-saving. The asphalt smoke of the products developed in Examples 1-3 were 39μg / g, 36μg / g, and 36μg / g, respectively. Compared with the traditional caulking glue of 132μg / g, the asphalt smoke emission was reduced by about 72%; the limiting oxygen index of the products developed in Examples 1-3 were 23%, 25%, and 26%, respectively, which was increased by 21%~37% compared with the traditional caulking glue of 19%. The products developed with lower asphalt smoke emissions and higher limiting oxygen index have good flame retardancy and environmental protection. In addition, the melting temperatures of the products developed in Examples 1-3 were 165℃, 170℃, and 170℃, respectively, which were 15℃~20℃ lower than the traditional caulking glue of 190℃, saving energy consumption, speeding up construction, and reducing road traffic control time.

[0070] The low-smoke flame-retardant composite modified asphalt caulking glue of the present invention can be used to repair cracks in asphalt pavements, cement pavements and other cement concrete flat structures. Compared with traditional caulking glue, it has the following advantages: (1) Good high-temperature heat resistance. The developed product does not deform at 100°C, which is better than the traditional caulking glue that does not deform at 60°C. It has better high-temperature heat resistance. Even if the road surface temperature reaches 80°C in hot summer areas, the caulking glue will not be carried away by the tire. (2) Excellent low-temperature flexibility. The developed product has no cracks or breaks at -15°C, which is better than the traditional caulking glue that has no cracks or breaks at -5°C. It has better low-temperature crack resistance in cold winter areas. (3) High bonding strength. The bonding strength of the developed product is 25% to 50% higher than that of traditional caulking glue, and the bonding effect with cracks is better. (4) The production and use process is environmentally friendly and energy-saving. The asphalt smoke emission of the developed product is reduced by about 72% compared with traditional caulking glue, and the limiting oxygen index is increased by 21% to 37% compared with traditional caulking glue. The product has good flame retardancy and environmental protection. The melting temperature of the developed product is 15℃~20℃ lower than that of traditional caulking glue, which saves energy, speeds up construction, reduces road traffic control time, and improves road traffic efficiency.

[0071] In the above embodiment and its alternatives, component A can be arbitrarily selected between 50 and 70 parts, component B can be arbitrarily selected between 3 and 6 parts, component C can be arbitrarily selected between 1 and 2 parts, component D can be arbitrarily selected between 5 and 10 parts, component E can be arbitrarily selected between 5 and 10 parts, component F can be arbitrarily selected between 10 and 20 parts, and component G can be arbitrarily selected between 5 and 15 parts.

[0072] In the above embodiment and its alternatives, the petroleum asphalt is selected from either 70# stone or 90# stone.

[0073] In the above embodiment and its alternatives, the flame retardant is a composite of antimony trioxide and expandable graphite in a mass percentage ratio of 2:1, and the particle size of the antimony trioxide is arbitrarily selected within the range of 0.5 to 1.0 μm.

[0074] In the above embodiment and its alternatives, the coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0075] In the above embodiment and its alternatives, the gutter oil is first-grade waste oil, and the mass percentage of the esterifiable matter is ≥94%.

[0076] In the above embodiment and its alternatives, the polymer is a composite of linear SBS (styrene-butadiene-styrene block copolymer) and TPU (thermoplastic polyurethane elastomer rubber) in a ratio of 5:2 by mass.

[0077] In the above embodiment and its alternatives, the particle size of the desulfurized gypsum powder is less than 45 μm.

[0078] In the above embodiment and its alternatives, the particle size of the waste asphalt mixture is arbitrarily selected within the range of 100 μm to 300 μm.

[0079] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, based on the ideas provided by the present invention, there may be changes in the specific implementation methods, and these changes should also be considered as the scope of protection of the present invention.

Claims

1. A low-smoke flame-retardant composite modified asphalt caulking glue, characterized in that: The raw materials for preparing the caulking glue include component A, component B, component C, component D, component E, component F and component G, among which: Component A is petroleum asphalt; Component B is a flame retardant; Component C is a coupling agent; Component D is waste cooking oil, which is first-class waste oil; Component E is a polymer, which is a composite of styrene-butadiene-styrene block copolymer and thermoplastic polyurethane elastomer rubber in a ratio of 5:2 by mass; Component F is desulfurized gypsum powder; Component G is waste asphalt mixture; The mass proportions of the components are as follows: component A is 50-70 parts, component B is 3-6 parts, component C is 1-2 parts, component D is 5-10 parts, component E is 5-10 parts, component F is 10-20 parts, and component G is 5-15 parts.

2. The low-smoke flame-retardant composite modified asphalt caulking adhesive according to claim 1, characterized in that: The raw materials for preparing the caulking glue are composed of component A, component B, component C, component D, component E, component F and component G. A total of 7 components A, B, C, D, E, F and G are heated at high temperature, sheared, developed and mixed in a stirring and mixing equipment.

3. The low-smoke flame-retardant composite modified asphalt caulking adhesive according to claim 1, characterized in that: The petroleum asphalt is one of 70# petroleum asphalt and 90# petroleum asphalt.

4. The low-smoke flame-retardant composite modified asphalt caulking adhesive according to claim 1, characterized in that: The flame retardant is a composite of antimony trioxide and expandable graphite in a mass percentage ratio of 2:

1.

5. The low-smoke flame-retardant composite modified asphalt caulking adhesive according to claim 1, characterized in that: The coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

6. The low-smoke flame-retardant composite modified asphalt caulking adhesive according to claim 1, characterized in that: The particle size of the desulfurized gypsum powder is less than 45 μm.

7. The low-smoke flame-retardant composite modified asphalt caulking adhesive according to claim 1, characterized in that: The particle size of the waste asphalt mixture ranges from 100 μm to 300 μm.

8. A method for preparing the low-smoke flame-retardant composite modified asphalt caulking adhesive according to any one of claims 1 to 7, characterized in that: The steps include: S1. Premixing of components B and C: Weigh the two substances in component B in proportion, add them to a high-speed mixer, start the high-speed mixer and maintain the speed at 100-150 rpm / min, open the dropping funnel containing component C, add component C dropwise over 5-6 minutes, increase the speed of the high-speed mixer to 300-400 rpm / min, and continue stirring for 10 minutes to complete the premixing of components B and C; S2. Dehydration of component F: Spread component F evenly on a sample plate and dehydrate in a drying oven at 100°C to constant weight; S3, Mixed: Heat component A to 135°C in a drying oven and add it into the reactor; Turn on the frame agitator at a speed of 100-150 rpm / min, then heat component A to 165-175°C, add the premix of components B and C, and stir for 5 minutes; Add component D, maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100~150 rpm / min, and stir for 5 minutes; Add component E, maintain the temperature of the material in the reactor at 165°C~175°C, the frame stirring speed at 100~150 rpm / min, turn on the high-speed shear, the high-speed shear speed at 5000~6000 rpm / min, and stir and shear for 45 minutes; Turn off the high-speed shearing machine, add component F, maintain the temperature of the material in the reactor at 165℃~175℃, and the frame stirring speed at 300~400rpm / min, and stir for 15 minutes; Add component G, maintain the material temperature in the reactor at 165°C~175°C, the frame stirring speed at 300~400 rpm / min, and stir for 20 minutes to obtain a low-smoke flame-retardant composite modified asphalt caulking adhesive.

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