Anti-aging modified asphalt and preparation method thereof

Abstract

Raw materials of the anti-aging modified asphalt comprise the following components in parts by weight: 80-100 parts of asphalt, 10-15 parts of an elastic modifier, 6-10 parts of an anti-aging mixture, 25-35 parts of an inorganic filler and 4-8 parts of modified rubber powder, the asphalt is petroleum asphalt, the colloid content of the petroleum asphalt is not less than 25 wt%, the aromatic content is not less than 35 wt%, and the asphaltene content is not higher than 12 wt% but not lower than 10 wt%. The saturation content is not lower than 12wt%. The modified asphalt not only can realize the needle penetration ratio in traditional anti-aging performance characterization and the anti-aging performance advantage of residual ductility characterization, but also has an excellent effect in the aspect of softening point difference before and after aging, and meanwhile, not only is the thermo-oxidative aging performance improved, but also the ultraviolet aging performance is improved, so that the comprehensive anti-aging performance of a product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tea deep processing, in particular to an aging-resistant modified asphalt and a preparation method thereof. Background Art

[0002] Asphalt mixture is a general term for a mixture made by mixing mineral materials and asphalt binders. According to the material composition and structure, it can be divided into continuous grading and discontinuous grading mixtures. According to the composition of mineral grading and the size of the void ratio, it can be divided into dense grading, semi-open grading, and open grading mixtures. According to the size of the nominal maximum particle size, it can be divided into extra coarse type (nominal maximum particle size greater than 31.5mm), coarse type (nominal maximum particle size equal to or greater than 26.5mm), medium type (nominal maximum particle size 16mm or 19mm), fine type (nominal maximum particle size 9.5mm or 13.2mm), and sand type (nominal maximum particle size less than 9.5mm) asphalt mixture. According to the manufacturing process, it can be divided into hot mix asphalt mixture, cold mix asphalt mixture, recycled asphalt mixture, etc. Existing asphalt pavement usually uses asphalt mixture as the main component. During long-term use, asphalt mixture is easily affected by the external environment and ages, shortening the service life of the asphalt pavement. Summary of the invention

[0003] The purpose of the present invention is to provide an aging-resistant modified asphalt and a preparation method thereof to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an aging-resistant modified asphalt, the raw materials of which include the following components in parts by weight: 80-100 parts of asphalt, 10-15 parts of elastic modifier, 6-10 parts of anti-aging mixture, 25-35 parts of inorganic filler and 4-8 parts of modified rubber powder, the asphalt is petroleum asphalt, the colloid content of the petroleum asphalt is not less than 25wt%, the aromatic content is not less than 35wt%, the asphaltene content is not higher than 12wt% but not less than 10wt%, and the saturated content is not less than 12wt%.

[0005] The spatial network structure formed by conventional asphalt has a small molecular weight and many unsaturated bonds, and is easily attenuated under external influences. In the present invention, the elastic modifier, anti-aging mixture and inorganic filler matching system can make the modified asphalt form a more stable spatial network structure, and at the same time can improve the high viscosity problem caused by the high modifier formula. On the basis of improving the high viscosity, the viscosity of the modified asphalt can be reduced by adding modified rubber powder.

[0006] The present invention has no special restrictions on the source of the petroleum asphalt, and commercially available products known to those skilled in the art can be used. In a preferred embodiment of the present invention, the petroleum asphalt is No. 90 base asphalt.

[0007] In the above scheme, the elastic modifier is styrene-butadiene-styrene block copolymer, and the styrene-butadiene-styrene block copolymer is a star-shaped SBS, wherein the styrene content is 30-40% by weight. In addition, as a further preferred scheme, the molecular weight of the SBS can be 150,000-350,000, and the melt flow rate is 0.05-3g / 10min.

[0008] In the above scheme, the anti-aging mixture is a mixture of nano-montmorillonite and antioxidants. The antioxidant mixture can not only achieve the anti-aging performance advantages characterized by needle penetration ratio and residual ductility in traditional anti-aging performance characterization, but also has excellent effects in the softening point difference before and after aging. At the same time, it has both improved thermal oxygen aging performance and improved ultraviolet aging performance, thereby achieving an improvement in the comprehensive anti-aging performance of the product.

[0009] In the above scheme, the antioxidant is dodecyl phosphite or decabromodiphenyl ether.

[0010] In the above solution, the inorganic filler is stone powder and / or talcum powder.

[0011] In the above scheme, the particle size of the inorganic filler is 180 to 300 meshes.

[0012] In the above scheme, the modified rubber powder is low-temperature modified powder.

[0013] A method for preparing aging-resistant modified asphalt comprises the following steps:

[0014] Step 1: heating the asphalt to 160-180° C., adding the elastic modifier and the modified rubber powder, and high shearing at a speed of 4000 rpm-6000 rpm for 10 min-15 min to obtain a first mixture;

[0015] Step 2: adding the anti-aging mixture to the first mixture, and high shearing for 20 min to 30 min at a rotation speed of 2000 rpm to 3000 rpm to obtain a second mixture;

[0016] Step three: adding inorganic filler to the second mixture, and subjecting the mixture to high shearing for 40 min to 60 min at a rotation speed of 3000 rpm to 4000 rpm to obtain the aging-resistant modified asphalt.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the anti-aging modified asphalt and its preparation method, the antioxidant mixture can not only achieve the advantages of anti-aging performance characterized by needle penetration ratio and residual ductility in traditional anti-aging performance characterization, but also has excellent effects in the softening point difference before and after aging, and at the same time, both the thermal oxygen aging performance and the ultraviolet aging performance are improved, thereby achieving the improvement of the comprehensive anti-aging performance of the product, the elastic modifier, the anti-aging mixture and the inorganic filler compatibility system can make the modified asphalt form a more stable spatial network structure, and at the same time can improve the high viscosity problem caused by the high modifier formula, and on the basis of improving the high viscosity, the viscosity of the modified asphalt can be reduced by adding modified rubber powder. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0019] A kind of aging-resistant modified asphalt, the raw materials of which include the following components in parts by weight: 80-100 parts of asphalt, 10-15 parts of elastic modifier, 6-10 parts of anti-aging mixture, 25-35 parts of inorganic filler and 4-8 parts of modified rubber powder, the asphalt is petroleum asphalt, the colloid content of the petroleum asphalt is not less than 25wt%, the aromatic content is not less than 35wt%, the asphaltene content is not higher than 12wt% but not less than 10wt%, and the saturated content is not less than 12wt%.

[0020] The spatial network structure formed by conventional asphalt has a small molecular weight and many unsaturated bonds, and is easily attenuated under external influences. In the present invention, the elastic modifier, anti-aging mixture and inorganic filler matching system can make the modified asphalt form a more stable spatial network structure, and at the same time can improve the high viscosity problem caused by the high modifier formula. On the basis of improving the high viscosity, the viscosity of the modified asphalt can be reduced by adding modified rubber powder.

[0021] The present invention has no special restrictions on the source of the petroleum asphalt, and commercially available products known to those skilled in the art can be used. In a preferred embodiment of the present invention, the petroleum asphalt is No. 90 base asphalt.

[0022] In the above scheme, the elastic modifier is styrene-butadiene-styrene block copolymer, and the styrene-butadiene-styrene block copolymer is a star-shaped SBS, wherein the styrene content is 30-40% by weight. In addition, as a further preferred scheme, the molecular weight of the SBS can be 150,000-350,000, and the melt flow rate is 0.05-3g / 10min.

[0023] In the above scheme, the anti-aging mixture is a mixture of nano-montmorillonite and antioxidants. The antioxidant mixture can not only achieve the anti-aging performance advantages characterized by needle penetration ratio and residual ductility in traditional anti-aging performance characterization, but also has excellent effects in the softening point difference before and after aging. At the same time, it has both improved thermal oxygen aging performance and improved ultraviolet aging performance, thereby achieving an improvement in the comprehensive anti-aging performance of the product.

[0024] In the above scheme, the antioxidant is dodecyl phosphite or decabromodiphenyl ether.

[0025] In the above solution, the inorganic filler is stone powder and / or talcum powder.

[0026] In the above scheme, the particle size of the inorganic filler is 180 to 300 meshes.

[0027] In the above scheme, the modified rubber powder is low-temperature modified powder.

[0028] Embodiment 1:

[0029] Preparation of aging-resistant modified asphalt:

[0030] 80 parts by weight of No. 90 base asphalt were heated to 160°C, 10 parts by weight of elastic modifier and 4 parts by weight of modified rubber powder were added, and the mixture was highly sheared at 4500 rpm for 10 minutes to obtain a first mixture. 6 parts by weight of anti-aging mixture were added to the first mixture, and the mixture was highly sheared at 2000 rpm for 20 minutes to obtain a second mixture. 25 parts by weight of inorganic filler were added to the second mixture, and the mixture was highly sheared at 3000 rpm for 40 minutes to obtain the anti-aging modified asphalt.

[0031] Embodiment 2:

[0032] 90 parts by weight of No. 90 base asphalt were heated to 170°C, 12.5 parts by weight of elastic modifier and 6 parts by weight of modified rubber powder were added, and the mixture was highly sheared at a speed of 5000 rpm for 12.5 minutes to obtain a first mixture. 8 parts by weight of anti-aging mixture were added to the first mixture, and the mixture was highly sheared at a speed of 2500 rpm for 25 minutes to obtain a second mixture. 30 parts by weight of inorganic filler were added to the second mixture, and the mixture was highly sheared at a speed of 3500 rpm for 50 minutes to obtain the anti-aging modified asphalt.

[0033] Embodiment three:

[0034] 100 parts by weight of No. 90 base asphalt were heated to 180°C, 15 parts by weight of elastic modifier and 8 parts by weight of modified rubber powder were added, and the mixture was highly sheared at a speed of 6000 rpm for 15 minutes to obtain a first mixture. 10 parts by weight of anti-aging mixture were added to the first mixture, and the mixture was highly sheared at a speed of 3000 rpm for 30 minutes to obtain a second mixture. 35 parts by weight of inorganic filler were added to the second mixture, and the mixture was highly sheared at a speed of 4000 rpm for 60 minutes to obtain the anti-aging modified asphalt.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aging-resistant modified asphalt, characterized in that: The raw materials include the following components in parts by weight: 80-100 parts of asphalt, 10-15 parts of elastic modifier, 6-10 parts of anti-aging mixture, 25-35 parts of inorganic filler and 4-8 parts of modified rubber powder. The asphalt is petroleum asphalt, and the colloid content of the petroleum asphalt is not less than 25wt%, the aromatic content is not less than 35wt%, the asphaltene content is not higher than 12wt% but not less than 10wt%, and the saturated content is not less than 12wt%.

2. The aging-resistant modified asphalt according to claim 1, characterized in that: The elastic modifier is a styrene-butadiene-styrene block copolymer.

3. The aging-resistant modified asphalt according to claim 1, characterized in that: The anti-aging mixture is a mixture of nano-montmorillonite and antioxidant.

4. The aging-resistant modified asphalt according to claim 3, characterized in that: The antioxidant is dodecyl phosphite or decabromodiphenyl ether.

5. The aging-resistant modified asphalt according to claim 1, characterized in that: The inorganic filler is stone powder and / or talcum powder.

6. The aging-resistant modified asphalt according to claim 1, characterized in that: The particle size of the inorganic filler is 180-300 meshes.

7. The aging-resistant modified asphalt according to claim 1, characterized in that: The modified rubber powder is low-temperature modified powder.

8. A method for preparing aging-resistant modified asphalt, characterized in that: The steps include: Step 1: heating the asphalt to 160-180° C., adding the elastic modifier and the modified rubber powder, and high shearing at a speed of 4000 rpm-6000 rpm for 10 min-15 min to obtain a first mixture; Step 2: adding the anti-aging mixture to the first mixture, and high shearing for 20 min to 30 min at a rotation speed of 2000 rpm to 3000 rpm to obtain a second mixture; Step three: adding inorganic filler to the second mixture, and subjecting the mixture to high shearing for 40 min to 60 min at a rotation speed of 3000 rpm to 4000 rpm to obtain the aging-resistant modified asphalt.