Flame-retardant road sealant and preparation method thereof

Abstract

The application belongs to the technical field of highway pavement repairing materials, and particularly relates to a flame-retardant road sealant and further discloses a preparation method thereof. The flame-retardant road sealant has good waterproof performance, water resistance, anti-aging performance and flame-retardant performance, and has a wide application range, and the preparation method is simple and easy to implement, and is suitable for industrial promotion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of highway pavement repair materials, and particularly relates to a flame-retardant road sealant, and further discloses a preparation method thereof. BACKGROUND

[0002] With the increase of traffic volume and the increase of the service time of the asphalt pavement, common cracks and other diseases will appear on the asphalt pavement, which almost accompanies the entire service period of the asphalt pavement and becomes one of the most common and most likely diseases in various damages of the asphalt pavement. In general, the pavement cracks need to be repaired in time, otherwise rainwater will enter the base through the cracks, causing the base and even the subgrade to soften, reducing the strength of the base and subgrade, and ultimately leading to the decrease of the bearing capacity of the asphalt pavement, and further causing the local or sheet damage of the pavement, seriously affecting the driving comfort, greatly reducing the service life of the pavement, and not only affecting the appearance of the pavement, but also increasing the repair cost, especially easily developing into structural damage of the pavement and shortening the service life of the pavement.

[0003] The material used for the crack pouring of the asphalt pavement is called road sealant or crack pouring glue. The commonly used road sealant is mostly modified asphalt high molecular polymer material for hot construction, which has the advantages of simple construction, short solidification time, fast opening to traffic and low price. However, the traditional road sealant needs to be exposed to the atmosphere for a long time during use, and is affected by water, air, ultraviolet light and other factors, which seriously changes the performance of the sealant, and further causes the moisture absorption, aging and even failure of the sealant, especially the poor flame-retardant performance of the traditional sealant also affects its use performance and safety performance.

[0004] At present, most of the flame-retardant sealants mainly use halogen-antimony, phosphorus-nitrogen, halogen-phosphorus and other synergistic flame-retardant materials to be compounded with inorganic flame retardants as flame retardants, but there are problems of strong toxicity of the flame retardant, much smoke and poor environmental benefits, which affect the application and promotion of the sealant. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a flame-retardant road sealant, which has the advantages of high strength, excellent water resistance, excellent aging resistance and excellent flame-retardant performance.

[0006] The second technical problem to be solved by the present application is to provide a preparation method of the above-mentioned flame-retardant road sealant.

[0007] To solve the above-mentioned technical problem, the flame-retardant road sealant provided by the present application comprises the following raw material components by weight:

[0008] 50-60 parts by weight of base asphalt;

[0009] SBS 8-12 parts by weight;

[0010] Magnesium-aluminum-zinc carbonate-type layered double hydroxide loaded with nanosilica 8-10 parts by weight;

[0011] Waste plastic particles 15-18 parts by weight;

[0012] Waste rubber powder 10-15 parts by weight;

[0013] Graphene oxide 1-3 parts by weight;

[0014] Catalytic cracking slurry oil 8-10 parts by weight.

[0015] Specifically, in the magnesium-aluminum-zinc carbonate-type layered double hydroxide loaded with nanosilica, the loading amount of nanosilica is 2-3wt%.

[0016] Specifically, the preparation method of the magnesium-aluminum-zinc carbonate-type layered double hydroxide loaded with nanosilica comprises the steps of adding tetraethyl orthosilicate into anhydrous ethanol and stirring thoroughly, and adding magnesium-aluminum-zinc carbonate-type layered double hydroxide and nanosilica and mixing thoroughly, and adjusting the pH of the system to be acidic, and after the complete hydrolysis of the tetraethyl orthosilicate, washing and drying to obtain the product.

[0017] Specifically, the mass ratio of nanosilica to magnesium-aluminum-zinc carbonate-type layered double hydroxide is controlled to be 3-5wt%.

[0018] Specifically, the particle size of nanosilica is 10-20nm.

[0019] Preferably, the step of adjusting the pH of the system to be acidic is adjusting the pH value to be 4-5.

[0020] Specifically, the reaction step is assisted by ultrasonic conditions.

[0021] Specifically, the base asphalt is 70# asphalt.

[0022] Specifically, the waste plastic particles include a mixture of one or both of polyethylene-based waste plastics and polypropylene-based waste plastics.

[0023] Specifically, the melt index of SBS is 0.03-0.10g / min.

[0024] Specifically, the flame-retardant road sealant:

[0025] The particle size of the waste plastic particles is 0.3-0.5mm;

[0026] The particle size of the waste rubber powder is 60-80 mesh;

[0027] The particle size of the graphene oxide is 150-250 nm.

[0028] The application further discloses a preparation method of the flame-retardant road sealant.

[0029] (1) A certain amount of the SBS and catalytic cracking slurry are soaked and pre-swelled for standby, which helps to improve the compatibility of the SBS and the asphalt, and the prepared road sealant has better stability;

[0030] (2) A certain amount of the base asphalt is heated, and the pre-swelled SBS and catalytic cracking slurry are added and uniformly mixed through high-speed shearing;

[0031] (3) The obtained liquid is heated, and a selected amount of the magnesium-aluminum-zinc carbonate layered double hydroxide loaded with nano silicon dioxide and waste rubber powder are added and uniformly mixed through high-speed shearing;

[0032] (4) A selected amount of the waste plastic particles and graphene oxide are continuously added and uniformly mixed through high-speed shearing, and the flame-retardant road sealant is obtained.

[0033] Specifically, the preparation method of the flame-retardant road sealant comprises the following steps:

[0034] In the step (1), the temperature of the soaking step is 100-120 DEG C, and the soaking time is 1.5-2.5 h;

[0035] In the step (2), the heating temperature of the base asphalt is 160-180 DEG C;

[0036] In the step (3), the heating temperature of the liquid is 180-190 DEG C;

[0037] In the step (4), the heating temperature of the liquid is 180-190 DEG C.

[0038] Specifically, the preparation method of the flame-retardant road sealant comprises the following steps:

[0039] In the step (2), the rotating speed of the high-speed shearing step is 3000-3500 r / min, and the shearing time is 40-50 min;

[0040] In the step (3), the rotating speed of the high-speed shearing step is 2000-3000 r / min, and the shearing time is 1-1.5 h;

[0041] In the step (4), the rotating speed of the high-speed shearing step is 2000-3000 r / min, and the shearing time is 0.5-1 h.

[0042] The application further discloses application of the flame-retardant road sealant in the field of highway pavement repair.

[0043] The fire-retardant type road sealant provided by the present application takes base pitch, SBS, magnesium-aluminum-zinc carbonate type layered double hydroxide loaded with nano-silicon dioxide, waste plastic particles, waste rubber powder, graphene oxide and catalytic cracking oil slurry as raw materials. The magnesium-aluminum-zinc carbonate type layered double hydroxide loaded with nano-silicon dioxide has a layered structure, and the layer plate collapses under high temperature conditions, easily forming a porous solid base, and further forming a solid base with a high specific surface and a large number of surface adsorption active centers, which can absorb a large amount of acidic gases, volatile substances and smoke generated by material combustion, and has a good environmental protection effect. Moreover, after being loaded with silicon dioxide, the magnesium-aluminum-zinc carbonate type layered double hydroxide has a good anti-ultraviolet aging effect, can significantly improve the high temperature performance of the sealant, and makes the product not easy to soften and flow under high temperature. The added graphene oxide not only has a unique two-dimensional layered nano structure, but also has a better fire-retardant performance in combination with the magnesium-aluminum-zinc carbonate type layered double hydroxide loaded with nano-silicon dioxide, and the prepared road sealant has good storage stability. The use of waste rubber powder as raw material not only makes the waste resources be reasonably utilized, but also greatly reduces the production cost and improves the added value of the product.

[0044] The fire-retardant type road sealant provided by the present application has good water-proof performance, water resistance, anti-aging performance and fire-retardant performance, and can be applied to the crack repair of asphalt pavement of asphalt, concrete road, expressway, high-grade road, urban road, airport runway and the like, the joint sealing repair of cement concrete pavement, or can be applied to the expansion joint of bridge or structure, and has a wide application range. The preparation method of the environment-friendly type road sealant provided by the present application is simple and easy to implement, and is suitable for industrial popularization. DETAILED DESCRIPTION

[0045] In the following examples of the present application, the performance parameters of the raw materials involved include:

[0046] The magnesium-aluminum-zinc carbonate type layered double hydroxide loaded with nano-silicon dioxide is prepared by the following method: a certain amount of tetraethyl orthosilicate is added to a proper amount of anhydrous ethanol and stirred thoroughly, a proper amount of magnesium-aluminum-zinc carbonate type layered double hydroxide and nano-silicon dioxide (the mass ratio of nano-silicon dioxide to magnesium-aluminum-zinc carbonate type layered double hydroxide is 4wt%) are added, and the mixture is ultrasonically treated for 2h until it is uniformly mixed, then the pH value of the solution is adjusted to 4-5, and the ultrasonic treatment is continued until the tetraethyl orthosilicate is completely hydrolyzed, then the product is collected, washed with deionized water and vacuum dried at 80℃ for 12h, and the product is obtained.

[0047] The base pitch is 70# pitch;

[0048] The particle size of the waste rubber powder is 60-80 mesh;

[0049] The melt index of the SBS is 0.03-0.10g / min;

[0050] The particle size of the waste plastic particles is 0.3-0.5mm;

[0051] The particle size of the graphene oxide is 150-250nm.

[0052] Example 1

[0053] First, 8 parts by weight of SBS and 8 parts by weight of catalytic cracking slurry are soaked at 110℃ for 2h, ready for use; 50 parts by weight of base pitch is heated to 170℃, under the condition of stirring, the pre-soaked SBS and catalytic cracking slurry are added, high-speed shearing at 3200r / min for 45min; continue to heat to 185℃, add 8 parts by weight of nano-silica loaded magnesium-aluminum-zinc carbonate layered double hydroxide and 10 parts by weight of waste rubber powder, high-speed shearing at 2500r / min for 1.2h, then add 15 parts by weight of polyethylene waste plastic, continue to shear at the temperature and speed for 1.5h, then add 1 part by weight of graphene oxide and continue to shear for 0.7h, to obtain the road sealant.

[0054] Example 2

[0055] First, 10 parts by weight of SBS and 9 parts by weight of catalytic cracking slurry are soaked at 110℃ for 2h, ready for use; 55 parts by weight of base pitch is heated to 170℃, under the condition of stirring, the pre-soaked SBS and catalytic cracking slurry are added, high-speed shearing at 3200r / min for 45min; continue to heat to 185℃, add 9 parts by weight of nano-silica loaded magnesium-aluminum-zinc carbonate layered double hydroxide and 12 parts by weight of waste rubber powder, high-speed shearing at 2500r / min for 1.2h, then add 16 parts by weight of polyethylene waste plastic, continue to shear at the temperature and speed for 1.5h, then add 2 parts by weight of graphene oxide and continue to shear for 0.7h, to obtain the road sealant.

[0056] Example 3

[0057] First, 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry are soaked at 110℃ for 2h, ready for use; 60 parts by weight of base pitch is heated to 170℃, under the condition of stirring, the pre-soaked SBS and catalytic cracking slurry are added, high-speed shearing at 3200r / min for 45min; continue to heat to 185℃, add 10 parts by weight of self-made nano-silica loaded magnesium-aluminum-zinc carbonate layered double hydroxide and 12 parts by weight of waste rubber powder, high-speed shearing at 2500r / min for 1.2h, then add 15 parts by weight of polypropylene waste plastic, continue to shear at the temperature and speed for 1.5h, then add 3 parts by weight of graphene oxide and continue to shear for 0.7h, to obtain the road sealant.

[0058] Example 4

[0059] Firstly, 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry were soaked at 110℃ for 2h, ready for use; 50 parts by weight of base pitch was heated to 170℃, under the condition of stirring, the pre-soaked SBS and catalytic cracking slurry were added, high-speed shearing at 3200r / min for 45min; continue to heat to 185℃, add 10 parts by weight of self-made nano-silica loaded magnesium-aluminum-zinc carbonate type layered double hydroxide and 15 parts by weight of waste rubber powder, high-speed shearing at 2500r / min for 1.2h, then add 18 parts by weight of polypropylene waste plastic to continue shearing at the temperature and speed for 1.5h, then add 3 parts by weight of graphene oxide to continue shearing for 0.7h, to obtain the road sealant.

[0060] Comparative Example 1

[0061] Firstly, 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry were soaked at 110℃ for 2h, ready for use; 50 parts by weight of base pitch was heated to 170℃, under the condition of stirring, the pre-soaked SBS and catalytic cracking slurry were added, high-speed shearing at 3200r / min for 45min; continue to heat to 185℃, add 10 parts by weight of talc and 15 parts by weight of waste rubber powder, high-speed shearing at 2500r / min for 1.2h, then add 18 parts by weight of polypropylene waste plastic to continue shearing at the temperature and speed for 1.5h, then add 3 parts by weight of graphene oxide to continue shearing for 0.7h, to obtain the road sealant.

[0062] Comparative Example 2

[0063] Firstly, 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry were soaked at 110℃ for 2h, ready for use; 50 parts by weight of base pitch was heated to 170℃, under the condition of stirring, the pre-soaked SBS and catalytic cracking slurry were added, high-speed shearing at 3200r / min for 45min; continue to heat to 185℃, add 10 parts by weight of self-made nano-silica loaded magnesium-aluminum-zinc carbonate type layered double hydroxide and 15 parts by weight of waste rubber powder, high-speed shearing at 2500r / min for 1.2h, then add 18 parts by weight of polypropylene waste plastic to continue shearing at the temperature and speed for 1.5h, then add 3 parts by weight of talc to continue shearing for 0.7h, to obtain the road sealant.

[0064] Comparative Example 3

[0065] Firstly, 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry were soaked at 110℃ for 2h, and then were prepared; 50 parts by weight of base pitch was heated to 170℃, and then the pre-soaked SBS and catalytic cracking slurry were added under stirring, and were sheared at a speed of 3200r / min for 45min; then the temperature was continuously increased to 185℃, 10 parts by weight of talcum powder and 15 parts by weight of waste rubber powder were added, and were sheared at a speed of 2500r / min for 1.2h; then 18 parts by weight of polypropylene waste plastic was added, and was sheared at the same temperature and speed for 1.5h; then 3 parts by weight of talcum powder was added, and was sheared for 0.7h, thus a road sealing glue was obtained.

[0066] Comparative Example 4

[0067] 50 parts by weight of base pitch was heated to 170℃, and then 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry were added under stirring, and were sheared at a speed of 3200r / min for 45min; then the temperature was continuously increased to 185℃, 10 parts by weight of self-made nano-silica loaded magnesium-aluminum-zinc carbonate-type layered double hydroxide and 15 parts by weight of waste rubber powder were added, and were sheared at a speed of 2500r / min for 1.2h; then 18 parts by weight of polypropylene waste plastic was added, and was sheared at the same temperature and speed for 1.5h; then 3 parts by weight of graphene oxide was added, and was sheared for 0.7h, thus a road sealing glue was obtained.

[0068] Comparative Example 5

[0069] Firstly, 12 parts by weight of SBS and 10 parts by weight of catalytic cracking slurry were soaked at 110℃ for 2h, and then were prepared; 50 parts by weight of base pitch was heated to 170℃, and then the pre-soaked SBS and catalytic cracking slurry were added under stirring, and were sheared at a speed of 3200r / min for 45min; then the temperature was continuously increased to 185℃, 10 parts by weight of talcum powder and 15 parts by weight of waste rubber powder were added, and were sheared at a speed of 2500r / min for 1.2h; then 18 parts by weight of polypropylene waste plastic was added, and was sheared at the same temperature and speed for 1.5h; then 3 parts by weight of talcum powder was added, and was sheared for 0.7h, thus a road sealing glue was obtained.

[0070] Experimental Example

[0071] The properties of the road sealing glue prepared in the above Examples 1-4 and Comparative Examples 1-5 were detected respectively, and the test results were shown in Tables 1-2.

[0072] Table 1 Properties of road sealing glue in Examples 1-4

[0073]

[0074] Table 2 Properties of road sealing glue in Comparative Examples 1-5

[0075]

[0076] From the data in Table 1, it can be seen that the road sealant according to the present application meets the technical index requirements before and after aging, and the aging operation has less effect on the performance of the sealant, indicating that the sealant has good anti-aging performance. Moreover, the oxygen index of the sealant is high, indicating that the sealant has good flame retardant performance.

[0077] From the data in Table 2, it can be seen that the elastic recovery rate of the sealant prepared in the comparative example is reduced more, and the oxygen index is lower, indicating that the road sealant prepared in the comparative example has poorer flame retardant performance and anti-aging performance than the sealant of the embodiment. It is proved that the road sealant prepared by the combination of the formula and the preparation method according to the present application has excellent anti-aging performance and flame retardant performance.

[0078] Obviously, the above embodiments are only examples for clearly illustrating, but not limit the embodiments. For those skilled in the art, based on the above description, other different forms of changes or variations can also be made. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A flame-retardant road sealant, characterized in that, The raw material components include the following parts by weight: 50-60 parts by weight of base asphalt; SBS 8-12 parts by weight; 8-10 parts by weight of magnesium aluminum zinc carbonate-type layered double hydroxide loaded with nano-silica; 15-18 parts by weight of waste plastic granules; 10-15 parts by weight of waste rubber powder; Graphene oxide, 1-3 parts by weight; 8-10 parts by weight of catalytic cracking slurry oil; The waste plastic particles have a particle size of 0.3-0.5 mm; the waste adhesive powder has a particle size of 60-80 mesh; and the graphene oxide has a particle size of 150-250 nm. In the magnesium aluminum zinc carbonate layered double hydroxide loaded with nano-silica, the loading amount of nano-silica is 2-3 wt%. The method for preparing the magnesium aluminum zinc carbonate-type layered double hydroxide loaded with nano-silica includes the steps of adding tetraethyl orthosilicate to anhydrous ethanol and stirring thoroughly, and adding the magnesium aluminum zinc carbonate-type layered double hydroxide and nano-silica and mixing thoroughly, adjusting the pH of the system to acidic, and washing and drying the tetraethyl orthosilicate after complete hydrolysis to obtain the product. The preparation method of the flame-retardant road sealant includes the following steps: (1) Take a selected amount of the SBS and catalytic cracking slurry and soak and pre-swell them for later use; (2) Take a selected amount of the base asphalt, heat it, and add the pre-swollen SBS and catalytic cracking slurry, and mix them by high-speed shearing; (3) Heat the obtained liquid and add a selected amount of the magnesium aluminum zinc carbonate layered double hydroxide loaded with nano silica and waste adhesive powder, and mix them by high-speed shearing. (4) Continue to add the selected amount of the waste plastic particles and graphene oxide, and mix them by high-speed shearing to obtain the final product.

2. The flame-retardant road sealant according to claim 1, characterized in that, The base asphalt is 70# asphalt.

3. The flame-retardant road sealant according to claim 1 or 2, characterized in that, The waste plastic particles include one or a mixture of two types of waste plastics, namely polyethylene waste plastics and polypropylene waste plastics.

4. A method for preparing the flame-retardant road sealant according to any one of claims 1-3, characterized in that, Includes the following steps: (1) Take a selected amount of the SBS and catalytic cracking slurry and soak and pre-swell them for later use; (2) Take a selected amount of the base asphalt, heat it, and add the pre-swollen SBS and catalytic cracking slurry, and mix them by high-speed shearing; (3) Heat the obtained liquid and add a selected amount of the magnesium aluminum zinc carbonate layered double hydroxide loaded with nano silica and waste adhesive powder, and mix them by high-speed shearing. (4) Continue to add the selected amount of the waste plastic particles and graphene oxide, and mix them by high-speed shearing to obtain the final product.

5. The method for preparing the flame-retardant road sealant according to claim 4, characterized in that: In step (1), the temperature of the soaking step is 100-120℃, and the soaking time is 1.5-2.5h; In step (2), the heating temperature of the base asphalt is 160-180℃; In step (3), the heating temperature of the liquid material is 180-190℃; In step (4), the heating temperature of the liquid is 180-190℃.

6. The method for preparing the flame-retardant road sealant according to claim 4 or 5, characterized in that: In step (2), the rotation speed of the high-speed shearing step is 3000-3500 r / min, and the shearing time is 40-50 min; In step (3), the rotation speed of the high-speed shearing step is 2000-3000 r / min, and the shearing time is 1-1.5 h; In step (4), the rotation speed of the high-speed shearing step is 2000-3000 r / min, and the shearing time is 0.5-1 h.

7. The application of the flame-retardant road sealant according to any one of claims 1-3 in the field of highway pavement repair.

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