CN109825099B - Modified asphalt and preparation method and application thereof - Google Patents
Modified asphalt and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides modified asphalt and a preparation method and application thereof, wherein the modified asphalt comprises the following components in parts by weight: 30-50 parts of asphalt; 5-20 parts of softening oil; 2-10 parts of butyl virgin rubber; 1-10 parts by weight of a styrene-butadiene-styrene block copolymer; 0.5-3 parts of petroleum resin; 0.15-0.25 parts of stabilizer; 20-50 parts of stone powder; the modified asphalt has good flexibility, peeling strength, weather resistance, bonding strength and stability, and is not easy to lose adhesion during storage; the preparation method is simple, the raw materials are easy to obtain, the price is low, the implementation is easy, and the preparation method can be applied to waterproof coiled materials or waterproof coatings.
Description
Technical Field
The invention belongs to the field of asphalt, and relates to modified asphalt, and a preparation method and application thereof.
Background
The traditional asphalt modification formula in the domestic waterproof industry mainly comprises asphalt, oil products, rubber modifiers, rubber powder, plastic modifiers, petroleum resin and fillers. In the prior art, SBS and SIS or SBS and SBR combination is mainly adopted to modify asphalt, the modified rubber material has weak binding power, and the surface is easy to lose adhesion in the storage period.
The existing waterproof coiled material is mainly an asphalt waterproof coiled material and comprises a base made of materials such as polyester felt, glass fiber felt or glass fiber reinforced polyester felt, an asphalt layer dip-coated on the surface of the base, and isolation material layers on the upper surface and the lower surface. Wherein the change of the components of the asphalt layer can greatly influence the performances of the waterproof coiled material, such as heat resistance, low-temperature flexibility, water impermeability, tensile property and the like.
CN109054689A discloses a self-adhesive waterproof material, which comprises the following raw materials in parts by weight of 100: 12-18 parts of softening oil, 23-25 parts of butyl hot melt adhesive material, 2-6 parts of asphalt, 1-5 parts of filler, 2-5 parts of tackifying rubber, 5-8 parts of high-temperature resin, 10-25 parts of tackifying resin, 4-5 parts of pigment and filler, 12-35 parts of low-density polyethylene, 20-50 parts of thermoplastic elastomer and 1-6 parts of auxiliary agent; the self-adhesive waterproof material prepared by the invention has better adhesive property, weather aging resistance, waterproof property and mechanical property, but the peel strength of the self-adhesive waterproof material is not mentioned.
CN108976832A discloses a novel polymer modified asphalt, a preparation method thereof and a waterproof roll, wherein the polymer modified asphalt is prepared from the following raw materials in percentage by mass: 50-70% of asphalt, 5-15% of polar group grafted polymer modifier, 10-20% of powder regenerated butyl rubber powder and 15-30% of filler; the modified asphalt has better low-temperature performance, high-temperature performance and binding power, but the binding power of the modified asphalt still needs to be improved.
CN108129858A discloses a modified asphalt sizing material, which comprises petroleum asphalt, a polymer modifier, an inorganic acid auxiliary agent, a tackifier, rubber powder and an inorganic filler; the modified asphalt has better viscosity and weather resistance, but the flexibility and the stripping performance of the modified asphalt still need to be improved.
Therefore, it is necessary to develop a modified asphalt with high peel strength, high weather resistance, high viscosity, good stability and low aging decay.
Disclosure of Invention
The invention aims to provide modified asphalt, a preparation method and application thereof, wherein the modified asphalt has better peel strength, weather resistance, bonding strength and stability, and is not easy to lose adhesion during storage; the preparation method is simple, the raw materials are easy to obtain, the price is low, the implementation is easy, and the preparation method can be applied to waterproof coiled materials or waterproof coatings.
In order to achieve the purpose, the invention adopts the following technical scheme:
one purpose of the invention is to provide modified asphalt, which comprises the following components in parts by weight:
the modified asphalt provided by the invention has better peel strength, weather resistance, bonding strength and stability, and is not easy to lose adhesion during the storage period; the butyl rubber and the styrene-butadiene-styrene block copolymer act together, so that the weather resistance, flexibility and strength of the modified asphalt can be further improved; the butyl virgin rubber and the stabilizer interact with each other, so that the performance attenuation of the modified asphalt after thermal aging can be slowed down.
In the present invention, the asphalt is present in an amount of 30 to 50 parts by weight, for example, 30 parts by weight, 32 parts by weight, 35 parts by weight, 37 parts by weight, 40 parts by weight, 42 parts by weight, 45 parts by weight, 47 parts by weight, 50 parts by weight, and the like. When the addition amount of the asphalt is less than 30 parts by weight, the bonding property of the modified asphalt is poor; when the amount of asphalt added in the present invention is more than 50 parts by weight, the modified asphalt is inferior in weather resistance and flexibility.
In the present invention, the softening oil is present in an amount of 5 to 20 parts by weight, for example, 5 parts by weight, 7 parts by weight, 10 parts by weight, 12 parts by weight, 15 parts by weight, 17 parts by weight, 20 parts by weight, and the like. When the addition amount of the softening oil is less than 5 parts by weight, the flexibility of the modified asphalt is low; when the amount of the softening oil added in the present invention is more than 15 parts by weight, the modified asphalt is inferior in weather resistance and adhesion property.
In the present invention, the butyl virgin rubber is present in an amount of 2 to 10 parts by weight, for example, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, etc. When the addition amount of the butyl virgin rubber is less than 2 parts by weight, the modification effect on the asphalt is poor, and the improvement on the bonding property of the modified asphalt is not obvious; when the addition amount of the butyl virgin rubber is more than 10 parts by weight, the prepared modified asphalt has high viscosity and is not beneficial to industrial production.
In the present invention, the weight part of the styrene-butadiene-styrene block copolymer is 1 to 10 parts by weight, for example, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, and the like. When the addition amount of the styrene-butadiene-styrene block copolymer in the present invention is less than 1 part by weight, the weather resistance and flexibility of the modified asphalt may be reduced; when the amount of the styrene-butadiene-styrene block copolymer added in the present invention is more than 10 parts by weight, the adhesive property of the modified asphalt is remarkably reduced.
In the present invention, the petroleum resin is present in an amount of 0.5 to 3 parts by weight, for example, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, etc. When the addition amount of the petroleum resin is less than 0.5 part by weight, the high-temperature resistance of the modified asphalt is poor, and the high-temperature fluidity of the modified rubber material is poor; when the amount of the petroleum resin added in the present invention is more than 3 parts by weight, the low-temperature flexibility of the modified asphalt is poor.
In the present invention, the stabilizer is added in an amount of 0.15 to 0.25 parts by weight, for example, 0.15 parts by weight, 0.16 parts by weight, 0.17 parts by weight, 0.18 parts by weight, 0.19 parts by weight, 0.20 parts by weight, 0.21 parts by weight, 0.22 parts by weight, 0.23 parts by weight, 0.24 parts by weight, 0.25 parts by weight, and the like. When the addition amount of the stabilizer is less than 0.15 part by weight, the storage period of the modified asphalt is unstable, and the low-temperature attenuation amplitude is large; when the addition amount of the stabilizer in the invention is more than 0.25 part by weight, the viscosity of the modified asphalt is high, which is not favorable for industrial production.
In the present invention, the stone powder is added in an amount of 20 to 50 parts by weight, for example, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, and the like.
As a preferable technical scheme of the invention, the modified asphalt comprises the following components in percentage by weight:
as a preferable technical scheme of the invention, the modified asphalt comprises the following components in percentage by weight:
in the present invention, the asphalt includes any one of 70# asphalt, 90# asphalt or 200# asphalt or a combination of at least two thereof, preferably 90# asphalt.
The 90# asphalt selected by the invention has better penetration at 25 ℃, and the 90# asphalt has better adhesive force, so that the penetration and adhesive force at 25 ℃ of the modified asphalt can be improved.
In the present invention, the softening oil includes any one or a combination of at least two of a reduced line oil, an aromatic oil, or a naphthenic oil, preferably an aromatic oil.
The softening oil of the present invention functions to help the butyl gum and the styrene-butadiene-styrene block copolymer to swell and disperse.
In the present invention, the butyl virgin rubber is butyl rubber.
In the present invention, the butyl rubber crude rubber is 1751 butyl rubber.
In the present invention, the weight average molecular weight of the styrene-butadiene-styrene block copolymer is 10 to 15 ten thousand, for example, 10 ten thousand, 10.5 ten thousand, 11 ten thousand, 11.5 ten thousand, 12 ten thousand, 12.5 ten thousand, 13 ten thousand, 13.5 ten thousand, 14 ten thousand, 14.5 ten thousand, 15 ten thousand, etc.
In the present invention, the styrene-butadiene-styrene block copolymer has a styrene structural unit content of 35 to 45% (e.g., 30%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, etc.), and a butadiene copolymer structural unit content of 55 to 65% (e.g., 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, etc.).
In the invention, when the content of the styrene structural unit in the styrene-butadiene-styrene block copolymer is 35-45% and the content of the butadiene copolymer structural unit is 55-65%, the prepared modified asphalt has high flexibility and strength, and the performance of the styrene-butadiene-styrene block copolymer is adjusted by adjusting the amount of monomers of styrene and butadiene, so that the asphalt has high flexibility, bonding strength and weather resistance, and the weather resistance, flexibility and bonding strength of the asphalt can be improved.
In the present invention, the mass ratio of the butyl crude to the styrene-butadiene-styrene block copolymer is 1:1 to 3:1, for example, 1:1, 1.5:1, 2:1, 2.5:1, 3:1, etc.
According to the invention, the butyl virgin rubber and the styrene-butadiene-styrene segmented copolymer act together, so that the weather resistance, flexibility and bonding strength of the modified asphalt can be further improved; when the mass ratio of the two is 1:1-3:1, the prepared modified asphalt has higher weather resistance, flexibility and strength; when the mass ratio of the two is out of the range defined in the present invention or either one is absent, the weather resistance, low-temperature flexibility and adhesive strength of the modified asphalt produced are lowered.
In the invention, the stabilizer is sulfur powder.
The stabilizer plays a stabilizing role, and can be matched with the butyl virgin rubber for use, so that the performance attenuation of the modified asphalt after thermal aging can be slowed down, and the weather resistance of the modified asphalt is further improved.
In the present invention, the weight average molecular weight of the petroleum resin is 2000-.
In the invention, the petroleum resin has better tackifying performance and improved high-temperature fluidity of the modified asphalt, and is convenient for industrial production.
In the present invention, the stone powder has a mesh size of 100-300 meshes, such as 100 meshes, 120 meshes, 150 meshes, 170 meshes, 200 meshes, 220 meshes, 250 meshes, 270 meshes, 300 meshes, etc.
The stone powder is used for reducing the production cost, and when the mesh number is 100-300 meshes, the stone powder and other substances have better dispersibility and uniformity.
The second purpose of the invention is to provide a preparation method of the modified asphalt, which comprises the following steps:
(1) mixing asphalt and softening oil, and heating to obtain a mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing and reacting to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing to obtain the modified asphalt.
The preparation method is simple, the raw materials are easy to obtain, the price is low, the implementation is easy, and the industrial large-scale implementation and application are facilitated.
In the present invention, the heating temperature in step (1) is 140-160 ℃, such as 140 ℃, 142 ℃, 145 ℃, 147 ℃, 150 ℃, 152 ℃, 155 ℃, 157 ℃, 160 ℃ and the like.
In the present invention, the reaction temperature in step (2) is 165-.
In the present invention, the reaction time in step (2) is 1-3h, such as 1h, 1.2h, 1.5h, 1.7h, 2h, 2.2h, 2.5h, 2.7h, 3h, etc.
In the present invention, the mixing in step (3) is carried out under high-shear stirring conditions.
In the present invention, the reaction temperature in step (3) is 155-.
In the present invention, the reaction time in step (3) is 40-60min, such as 40min, 42min, 45min, 47min, 50min, 52min, 55min, 57min, 60min, etc.
In the present invention, the mixing time in step (4) is 0.2-0.8h, such as 0.2h, 0.3h, 0.4h, 0.5h, 0.6h, 0.7h, 0.8h, etc.
In the present invention, the mixing time in step (5) is 0.5-1.5h, such as 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1.0h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, etc.
As a preferred technical scheme of the invention, the preparation method comprises the following steps:
(1) mixing asphalt and softening oil, and heating at 140 ℃ and 160 ℃ to obtain a mixture A;
(2) adding butyl crude rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting at 165-180 ℃ for 1-3h to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting at 155-165 ℃ for 40-60min to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.5-0.8h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 0.5-1.5h to obtain the modified asphalt.
The invention also aims to provide a waterproof coiled material, which comprises the modified asphalt.
The fourth purpose of the invention is to provide the application of the waterproof coiled material as the third purpose in buildings as a waterproof material.
Compared with the prior art, the invention has the following beneficial effects:
the modified asphalt provided by the invention has better peel strength, low-temperature flexibility (as low as minus 35 ℃), heat resistance (as high as 93 ℃), bonding strength (as high as 4.83 ten thousand mPa) and stability, and is not easy to lose viscosity during storage; the preparation method is simple, the raw materials are easy to obtain, the price is low, the implementation is easy, the industrial large-scale development and application are facilitated, and the preparation method can be applied to waterproof coiled materials or waterproof coatings.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides modified asphalt, which comprises the following components in parts by weight:
wherein the asphalt is 90# asphalt; the softening oil is aromatic oil; the butyl virgin rubber is 1750 butyl rubber; the weight average molecular weight of the styrene-butadiene-styrene block copolymer was 13 ten thousand; the styrene-butadiene-styrene block copolymer contains 40 percent of styrene structural units and 60 percent of butadiene copolymer structural units; the weight average molecular weight of the petroleum resin is 4000; the mesh number of the stone powder is 200 meshes.
The preparation method comprises the following steps:
(1) mixing asphalt and softened oil, and heating at 150 deg.C to obtain mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting for 2 hours at 170 ℃ to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting for 50min at 160 ℃ to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.6h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 1.0h to obtain the modified asphalt.
Example 2
The embodiment provides modified asphalt, which comprises the following components in parts by weight:
wherein the asphalt is 90# asphalt; the softening oil is aromatic oil; the butyl virgin rubber is 1750 butyl rubber; the weight average molecular weight of the styrene-butadiene-styrene block copolymer was 10 ten thousand; the styrene-butadiene-styrene block copolymer contains 45 percent of styrene structural units and 55 percent of butadiene copolymer structural units; the weight average molecular weight of the petroleum resin is 3000; the mesh number of the stone powder is 250 meshes.
The preparation method comprises the following steps:
(1) mixing asphalt and softened oil, and heating at 140 deg.C to obtain mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting for 3 hours at 165 ℃ to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting at 155 ℃ for 60min to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.5h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 0.5h to obtain the modified asphalt.
Example 3
The embodiment provides modified asphalt, which comprises the following components in parts by weight:
wherein the asphalt is 90# asphalt; the softening oil is aromatic oil; the butyl virgin rubber is 1750 butyl rubber; the weight average molecular weight of the styrene-butadiene-styrene block copolymer was 15 ten thousand; the styrene-butadiene-styrene block copolymer contains 35 percent of styrene structural units and 65 percent of butadiene copolymer structural units; the weight average molecular weight of the petroleum resin is 4000; the mesh number of the stone powder is 150 meshes.
The preparation method comprises the following steps:
(1) mixing asphalt and softened oil, and heating at 160 ℃ to obtain a mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting for 1h at 180 ℃ to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting at 165 ℃ for 40min to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.2h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 1.5h to obtain the modified asphalt.
Example 4
The embodiment provides modified asphalt, which comprises the following components in parts by weight:
wherein the asphalt is 90# asphalt; the softening oil is aromatic oil; the butyl virgin rubber is 1750 butyl rubber; the weight average molecular weight of the styrene-butadiene-styrene block copolymer was 12 ten thousand; the styrene-butadiene-styrene block copolymer contains 38 percent of styrene structural units and 62 percent of butadiene copolymer structural units; the weight average molecular weight of the petroleum resin is 2000; the mesh number of the stone powder is 100 meshes.
The preparation method comprises the following steps:
(1) mixing asphalt and softened oil, and heating at 140 deg.C to obtain mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting for 1h at 180 ℃ to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting at 160 ℃ for 40min to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.3h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 1.2h to obtain the modified asphalt.
Example 5
The embodiment provides modified asphalt, which comprises the following components in parts by weight:
wherein the asphalt is 90# asphalt; the softening oil is aromatic oil; the butyl virgin rubber is 1750 butyl rubber; the weight average molecular weight of the styrene-butadiene-styrene block copolymer was 14 ten thousand; the styrene-butadiene-styrene block copolymer contains 43 percent of styrene structural units and 57 percent of butadiene copolymer structural units; the weight average molecular weight of the petroleum resin is 5000; the mesh number of the stone powder is 300 meshes.
The preparation method comprises the following steps:
(1) mixing asphalt and softened oil, and heating at 160 ℃ to obtain a mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting for 3 hours at 165 ℃ to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting at 155 ℃ for 50min to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.6h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 0.7h to obtain the modified asphalt.
Example 6
The only difference from example 1 is that 10 parts by weight of butyl rubber and 2 parts by weight of styrene-butadiene-styrene block copolymer, i.e., the mass ratio of butyl rubber and styrene-butadiene-styrene block copolymer was 5:1, and the remaining raw materials and preparation method were the same as example 1.
Example 7
The only difference from example 1 was that the styrene-butadiene-styrene block copolymer had a styrene structural unit content of 20% and a butadiene copolymer structural unit content of 80%, and the remaining raw materials and preparation methods were the same as in example 1.
Example 8
The only difference from example 1 is that the styrene-butadiene-styrene block copolymer had a styrene structural unit content of 60% and a butadiene copolymer structural unit content of 40%, and the remaining raw materials and preparation methods were the same as in example 1.
Example 9
The difference from the example 1 is only that the softening oil is the reduced line oil, and the rest of the raw materials and the preparation method are the same as the example 1.
Comparative example 1
The only difference from example 1 is that butyl rubber was not included in the modified asphalt, and the styrene-butadiene-styrene block copolymer was added in an amount of 10.5 parts by weight as the sum of the mass of butyl rubber and styrene-butadiene-styrene block copolymer in example 1, and the remaining raw materials and the preparation method were the same as in example 1.
Comparative example 2
The modified asphalt only differs from the modified asphalt in that the modified asphalt does not contain a styrene-butadiene-styrene block copolymer, but the addition amount of the butyl rubber is the sum of the mass of the butyl rubber and the mass of the styrene-butadiene-styrene block copolymer in the modified asphalt in example 1, namely the addition amount of the butyl rubber is 10.5 parts by weight, and the rest of the raw materials and the preparation method are the same as those in example 1.
Comparative example 3
The modified asphalt only differs from the modified asphalt in example 1 in that the modified asphalt does not comprise a stabilizer, the addition amount of the butyl rubber is the sum of the mass of the butyl rubber and the mass of the stabilizer in example 1, namely the addition amount of the butyl rubber is 4.2 parts by weight, and the rest of raw materials and the preparation method are the same as those in example 1.
Comparative example 4
The difference from example 1 is only that styrene butadiene rubber is used instead of butyl rubber, and the rest of raw materials and preparation method are the same as example 1.
Comparative example 5
The difference from the example 1 is that the butyl rubber is replaced by styrene-butadiene rubber powder, and the rest raw materials and the preparation method are the same as the example 1.
Waterproof rolls prepared from the modified asphalt prepared in examples 1 to 11 and comparative examples 1 to 5 of the present invention were subjected to the following performance tests according to the national standard GB/T35467-2017 "Wet-laid waterproof roll", and the test results are shown in tables 1 and 2 for the waterproof rolls prepared in examples 1 to 11 and comparative examples 1 to 5.
TABLE 1
TABLE 2
As can be seen from tables 1 and 2, the modified asphalt prepared by the present invention has better heat resistance, low temperature flexibility, peel strength and adhesive strength, and from the comparison of examples 1 and 6, when the mass ratio of the butyl crude rubber and the styrene-butadiene-styrene block copolymer is not in the range of 1:1 to 3:1, the low temperature flexibility, heat resistance, peel strength and adhesive strength of the prepared modified asphalt are all reduced; as is apparent from a comparison of examples 1 and 7 to 8, when the styrene structural unit or the butadiene copolymer structural unit in the styrene-butadiene-styrene block copolymer is out of the range defined in the present invention, the low-temperature flexibility, the heat resistance and the peel strength of the modified asphalt to be prepared are lowered; as is clear from the comparison between example 1 and example 9, when the reduced line oil is used in place of the aromatic oil, the flexibility of the modified asphalt is reduced; as is apparent from comparison of example 1 with comparative examples 1 to 2, when the modified asphalt does not include any of butyl virgin rubber or a styrene-butadiene-styrene block copolymer, the low-temperature flexibility, heat resistance, peel strength and adhesive strength of the prepared modified asphalt are lowered; as is clear from the comparison of example 1 and comparative example 3, when the modified asphalt does not include a stabilizer, the magnitude of the deterioration of the modified asphalt produced increases; as can be seen from the comparison of example 1 with comparative examples 4 to 5, when the butyl rubber is replaced with rubber powder or styrene-butadiene rubber, the low-temperature flexibility, heat resistance, peel strength and adhesive strength of the prepared modified asphalt are greatly reduced; therefore, the modified asphalt prepared by the invention has better heat resistance, low-temperature flexibility, peeling strength and adhesive strength.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (21)
1. The modified asphalt is characterized by comprising the following components in parts by weight:
30-50 parts of asphalt;
5-20 parts of softening oil;
2-10 parts of butyl virgin rubber;
1-10 parts by weight of a styrene-butadiene-styrene block copolymer;
0.5-3 parts of petroleum resin;
0.15-0.25 parts of stabilizer;
20-50 parts of stone powder;
the softening oil is aromatic oil;
the stabilizer is sulfur powder;
the styrene-butadiene-styrene block copolymer contains 35-45% of styrene structural units and 55-65% of butadiene copolymer structural units;
the mass ratio of the butyl rubber to the styrene-butadiene-styrene block copolymer is 1:1-3: 1.
2. The modified asphalt of claim 1, wherein the modified asphalt comprises the following components in parts by weight:
40-50 parts of asphalt;
10-15 parts of softening oil;
3-8 parts of butyl virgin rubber;
2-5 parts by weight of a styrene-butadiene-styrene block copolymer;
0.5-1 part by weight of petroleum resin;
0.15-0.25 parts of stabilizer;
30-40 parts of stone powder.
3. The modified asphalt of claim 1, wherein the modified asphalt comprises the following components in parts by weight:
45 parts of asphalt;
12 parts by weight of softening oil;
6.5 parts of butyl virgin rubber;
4 parts by weight of a styrene-butadiene-styrene block copolymer;
1 part by weight of petroleum resin;
0.2 part by weight of a stabilizer;
34.5 parts of stone powder.
4. The modified asphalt of claim 1, wherein the asphalt comprises any one of 70# asphalt, 90# asphalt, or 200# asphalt, or a combination of at least two of them.
5. The modified asphalt of claim 1, wherein the asphalt is 90# asphalt.
6. The modified asphalt of claim 1, wherein the butyl virgin rubber is 1751 butyl rubber.
7. The modified asphalt of claim 1, wherein the weight average molecular weight of the styrene-butadiene-styrene block copolymer is 10 to 15 ten thousand.
8. The modified asphalt as claimed in claim 1, wherein the weight average molecular weight of the petroleum resin is 2000-5000.
9. The modified asphalt as claimed in claim 1, wherein the stone powder has a mesh size of 100-300.
10. The process for preparing modified asphalt according to any one of claims 1 to 9, wherein the process comprises the steps of:
(1) mixing asphalt and softening oil, and heating to obtain a mixture A;
(2) adding butyl rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing and reacting to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing to obtain the modified asphalt.
11. The method as claimed in claim 10, wherein the heating temperature in step (1) is 140-160 ℃.
12. The method as set forth in claim 10, wherein the reaction temperature in the step (2) is 165-180 ℃.
13. The method according to claim 10, wherein the reaction time in the step (2) is 1 to 3 hours.
14. The method of claim 10, wherein the mixing of step (3) is performed under shear stirring.
15. The method as claimed in claim 10, wherein the reaction temperature in step (3) is 155-165 ℃.
16. The method according to claim 10, wherein the reaction time in the step (3) is 40 to 60 min.
17. The method of claim 10, wherein the mixing time of step (4) is 0.2 to 0.8 h.
18. The method of claim 10, wherein the mixing time of step (5) is 0.5 to 1.5 hours.
19. The method of claim 10, comprising the steps of:
(1) mixing asphalt and softening oil, and heating at 140 ℃ and 160 ℃ to obtain a mixture A;
(2) adding butyl crude rubber and a styrene-butadiene-styrene block copolymer into the mixture A, and reacting at 165-180 ℃ for 1-3h to obtain a mixture B;
(3) adding a stabilizer into the mixture B, mixing under the condition of shearing and stirring, and reacting at 155-165 ℃ for 40-60min to obtain a mixture C;
(4) adding petroleum resin into the mixture C, and mixing for 0.5-0.8h to obtain a mixture D;
(5) adding stone powder into the mixture D, and mixing for 0.5-1.5h to obtain the modified asphalt.
20. A waterproof roll characterized by comprising the modified asphalt as claimed in any one of claims 1 to 9.
21. Use of a waterproofing membrane according to claim 20 as a waterproofing material in buildings.
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| CN111647276B (en) * | 2020-04-30 | 2021-12-03 | 深圳市卓宝科技股份有限公司 | Sizing material for asphalt-based waterproof system |
| CN112961507A (en) * | 2021-04-23 | 2021-06-15 | 山东京博石油化工有限公司 | Waterproof special asphalt and preparation method thereof |
| CN113604064B (en) * | 2021-08-25 | 2023-08-15 | 苏州卓宝科技有限公司 | Stabilizer application for improving film tearing performance of non-tire waterproof coiled material |
| CN113956842A (en) * | 2021-09-28 | 2022-01-21 | 深圳市卓宝科技股份有限公司 | Heat-aging-resistant coating material for self-adhesive waterproof coiled material and preparation method and application thereof |
| CN114149762B (en) * | 2021-10-19 | 2023-05-30 | 苏州卓宝科技有限公司 | Production formula and process of waterproof coiled material sizing material |
| CN114875690B (en) * | 2022-06-01 | 2022-11-25 | 科顺防水科技股份有限公司 | Coating material composition, modified asphalt waterproof coiled material coating material, preparation method and application thereof, and waterproof coiled material |
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