CN113004707B - A kind of additive for high-viscosity and high-elastic asphalt and its preparation method and application - Google Patents

Abstract

The invention relates to an additive for high-viscosity and high-elastic asphalt, a preparation method and application thereof, and belongs to the technical field of asphalt additives. The additive comprises the following components in parts by weight: 5-15 parts of petroleum resin, 5 parts of terpene resin ~15 parts, 3-8 parts of terpene phenolic resin, 60-80 parts of thermoplastic elastomer, 5-15 parts of ethylene-vinyl acetate copolymer, 1-2 parts of amide-based dispersant; using thermoplastic elastomer as the main material, adding Petroleum resin, terpene resin, terpene phenolic resin are used as tackifying resin, and ethylene-vinyl acetate copolymer is added as reinforcing agent and compatibilizer. The additive is subjected to high temperature during mixing with asphalt, coarse aggregate and fine aggregate. It softens by action, fully combines with asphalt, coarse aggregate and fine aggregate, and fills and inserts into the gap of the graded skeleton, restricts the relative sliding between coarse aggregate and fine aggregate, and strengthens asphalt, coarse aggregate, and fine aggregate. Bond strength of fine aggregates.

Description

A kind of additive for high-viscosity and high-elastic asphalt and its preparation method and application

technical field

The invention relates to the technical field of asphalt additives, in particular to an additive for high-viscosity and high-elasticity asphalt and a preparation method and application thereof.

Background technique

OGFC color permeable asphalt pavement is a colored pavement made of high-viscosity colored modified asphalt, pigments and high-quality aggregates with large voids (generally about 20%). It has excellent drainage, anti-skid, noise reduction and other functions. It is a safe and environmentally friendly ecological asphalt concrete pavement pavement technology, which is suitable for the sponge city that the country is vigorously building; in addition, OGFC has functions such as drainage, anti-skid, noise reduction, etc. Color pavement is used in special sections such as sharp turns and steep slopes, intersections, children's school roads, and gas stations, which can play a warning role; it can also relieve visual fatigue; beautify the street space environment and make the street space a favorite among people Urban high-quality living space.

Drainage OGFC pavement generally includes the following structural layers: drainage asphalt mixture upper layer, emulsified asphalt waterproof adhesive layer, dense-grade asphalt concrete middle surface layer, dense-grade asphalt concrete lower layer, semi-rigid base layer and sub-base; In the upper layer of the asphalt mixture, the drainage asphalt mixture has more coarse aggregates and less fine aggregates, and a strong interlocking effect cannot be formed between particles. The bonding strength of asphalt and coarse aggregates and fine aggregates mainly depends on cementitious materials. Therefore, it is imminent to develop a high-viscosity additive that can firmly bond the coarse aggregate, fine aggregate and asphalt in the drainage asphalt mixture.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an additive for high-viscosity and high-elasticity asphalt and its preparation method and application. The additive can be used in drainage asphalt to significantly improve the bonding strength of asphalt and coarse aggregate and fine aggregate.

One of the above-mentioned purposes of the present invention is achieved through the following technical solutions:

An additive for high-viscosity and high-elastic asphalt, comprising the following components in parts by weight:

5-15 parts of petroleum resin, 5-15 parts of terpene resin, 3-8 parts of terpene phenolic resin, 60-80 parts of thermoplastic elastomer, 5-15 parts of ethylene-vinyl acetate copolymer, 1-2 parts of amide type dispersant share.

By adopting the above technical scheme, the thermoplastic elastomer is used as the main material to ensure that the additive has excellent high elasticity, and at the same time, it can also ensure that the additive has good low temperature resistance; Adhesive resin, after adding ethylene-vinyl acetate copolymer, can significantly improve the dynamic viscosity of asphalt at 60 ℃, both components can improve the bonding strength of coarse aggregate, fine aggregate and asphalt, ethylene-vinyl acetate copolymer It can also be used as a compatibilizer to help the combination of tackifying resin and thermoplastic elastomer; the above components are used for compounding, and the compatibility design is reasonable. During the mixing process of fine aggregate, it is softened by the action of high temperature, fully combined with asphalt, coarse aggregate and fine aggregate, and is filled and extruded into the gap of the graded skeleton, which limits the relative sliding between coarse aggregate and fine aggregate. , which enhances the interaction between the drainage asphalt mixture, thereby improving the bonding strength of asphalt and coarse aggregate and fine aggregate; the additive is used in asphalt, and can also improve the high elasticity and low temperature resistance of asphalt.

The present invention is further provided as follows: the thermoplastic elastomer is selected from one of oil-extended SBS and TPU, or is compounded with a weight ratio of 1:1.

By adopting the above technical solution, SBS is the abbreviation of styrene-butadiene thermoplastic elastomer, which has the advantages of light weight, good elasticity and low temperature resistance. Oil-filled SBS is a small-molecule grease embedded in macromolecular SBS, which can be reduced after oil-filled. The interaction between macromolecules produces lubricating effect. Macroscopically, oil-extended SBS has good softness and fluidity, and is easy to be mixed with other components to improve the easy combination of the additive and asphalt; TPU is thermoplastic. Polyurethane elastomer rubber, with a wide range of hardness, good wear resistance, oil resistance, transparency and high elastic properties, and no deformation, twisting and cracking at minus 40 ~ 60 ℃, using one or both of oil-filled SBS and TPU Compounding, as the main material of the additive, can significantly improve the high elasticity and low temperature resistance of the additive.

The present invention is further provided as follows: the oil-extended SBS is prepared by the following method: 10-15 parts by weight of aromatic hydrocarbon oil is immersed in 100 parts by weight of SBS and allowed to stand for 1-2 hours; Blend at ~115°C for 30 to 45 minutes; drop 3 to 5 parts by weight of fatty alcohol polyoxyethylene ether, and mix uniformly.

By adopting the above technical solution, the SBS is impregnated with aromatic oil, which can improve the processing performance. The oil-extended SBS helps to improve the mixing and dispersing performance with other components. The main components of the aromatic oil are aromatics and colloids. The main components of asphalt are aromatics, colloids, asphaltenes, etc. According to the similar compatibility, it is beneficial to improve the binding between oil-extended SBS and asphalt. In addition, adding aromatic oil can maximize the low temperature resistance of asphalt. The fatty alcohol polyoxyethylene ether has good detergency, wetting, emulsifying, and hard water resistance. The dripping of the fatty alcohol polyoxyethylene ether can promote the impregnation and dissolution of the aromatic oil in SBS. Oil-extended SBS has excellent workability and low temperature resistance.

The present invention is further provided as follows: the petroleum resin is selected from C5 petroleum resin and C9 petroleum resin compounded in a weight ratio of 1:1.

By adopting the above technical solutions, C5 petroleum resin has high peeling adhesive strength, good fast tack, stable adhesive performance, good compatibility with asphalt-based components, and excellent anti-aging properties; C9 petroleum resin contains Double bond, large cohesion, good compatibility with terpene resin and thermoplastic elastomer, and also has a tackifying effect. The compound use of C5 petroleum resin and C9 petroleum resin has excellent tackifying effect and anti-aging properties. After compounding, the compatibility with terpene resin, terpene phenolic resin and thermoplastic elastomer can be significantly improved, and the compatibility with asphalt-based components is good.

The present invention is further set as follows: the vinyl acetate content in the ethylene-vinyl acetate copolymer is 35-40%.

By adopting the above technical scheme, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is limited to 35-40%, which greatly reduces the crystallinity of the branched chains in the ethylene-vinyl acetate copolymer, and increases the distance between the molecular chains. Compared with PE material, the additive has better elasticity and softness.

The second purpose of the present invention is achieved through the following technical solutions:

A preparation method of an additive for high-viscosity and high-elasticity asphalt, comprising the steps:

(1) Ingredients: According to parts by weight, weigh 5-15 parts of petroleum resin, 5-15 parts of terpene resin, 3-8 parts of terpene phenolic resin, 60-80 parts of thermoplastic elastomer, 5 parts of ethylene-vinyl acetate copolymer ~15 parts, 1-2 parts of amide dispersant;

(2) uniformly mixing thermoplastic elastomer, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 205-215°C for 1.5-2 hours, and then extrude the die at 150-160°C;

(4) Granulation.

By adopting the above technical scheme, thermoplastic elastomer, petroleum resin, terpene resin, terpene phenolic resin and ethylene-vinyl acetate copolymer are mixed, and after mixing uniformly, the mixture is put into a twin-screw extruder, and the processing process is convenient , fast, stable molding.

The third purpose of the present invention is achieved through the following technical solutions:

An application of an additive for high-viscosity and high-elasticity asphalt, which is used in preparing high-elasticity and high-viscosity asphalt, paving OTFG permeable asphalt pavement, SMA pavement or steel bridge deck pavement.

By adopting the above technical solution, the additive can be applied to the preparation of high-viscosity and high-elastic asphalt, and can also be added to pavement of OTFG permeable asphalt pavement, SMA pavement or steel bridge deck, which can significantly improve the overall strength of asphalt or pavement and bridge deck. , High elasticity and low temperature resistance.

To sum up, the beneficial technical effects of the present invention are:

1. High viscosity: This application uses thermoplastic elastomer as the main material, adding petroleum resin, terpene resin and terpene phenolic resin as tackifying resin, adding ethylene-vinyl acetate copolymer, which can further increase the viscosity and improve the viscosity. Compatibility of resin and main material, blending the above components can significantly improve the bonding strength of asphalt with coarse aggregate and fine aggregate;

2. High elasticity: The additive is made of thermoplastic elastomer, which helps to prepare high-elasticity additives. The addition of ethylene-vinyl acetate copolymer can further improve the elasticity of the additive; the use of oil-extended SBS can further improve the high degree of asphalt. elasticity;

3. Excellent low temperature resistance: the thermoplastic elastomer as the main material can ensure that the additive has excellent low temperature resistance, and the synergistic effect of the three resins is also conducive to promoting the improvement of the low temperature resistance of molding asphalt; adding ethylene-vinyl acetate The copolymer can also promote the low temperature resistance of the asphalt after molding;

4. Ease of processing: The selected terpene resin, petroleum resin and terpene phenolic resin have similar melting temperatures and low processing difficulty.

Detailed ways

The present invention will be described in further detail below in conjunction with the embodiments.

C5 petroleum resin, C9 petroleum resin, terpene resin, and terpene phenolic resin are all commercially available, and the melting temperature is about 120-140 °C; amide-based dispersants are purchased from Shenzhen Jinlong Chemical Technology Co., Ltd. Agent EBS; SBS selects 792E (YH-1401E) SBS particles produced by Baling Petrochemical Company; TPU selects C85A10 thermoplastic polyurethane TPU particles produced by Germany BASF; aromatic oil selects aromatic oil produced by Zibo Guangyi Petrochemical Co., Ltd.

Example 1 of raw material preparation:

An oil-extended SBS is prepared by the following method: 10 parts by weight of aromatic hydrocarbon oil is immersed in 100 parts by weight of SBS and allowed to stand for 1.5 hours, then the oil-extended SBS is placed on an open mill, and blended at 110° C. for 40 minutes; 3 parts by weight of fatty alcohol polyoxyethylene ether, knead uniformly.

Example 2 of raw material preparation:

An oil-extended SBS is prepared by the following method: 12 parts by weight of aromatic hydrocarbon oil is immersed in 100 parts by weight of SBS and allowed to stand for 1.5 hours, then the oil-extended SBS is placed on an open mill, and blended at 110° C. for 40 minutes; 4 parts by weight of aliphatic alcohol polyoxyethylene ether, knead uniformly.

Raw material preparation example three:

An oil-extended SBS is prepared by the following method: 15 parts by weight of aromatic hydrocarbon oil is immersed in 100 parts by weight of SBS and allowed to stand for 1.5 hours, then the oil-extended SBS is placed on an open mill, and blended at 110° C. for 40 minutes; 5 parts by weight of fatty alcohol polyoxyethylene ether, knead uniformly.

Example 1:

An additive for high-viscosity and high-elastic asphalt is prepared by the following method:

(1) batching: according to parts by weight, weigh 2.5 parts of C5 petroleum resins, 2.5 parts of C9 petroleum resins, 5 parts of terpene resins, 3 parts of terpene phenolic resins, 60 parts of oil-extended SBS prepared by raw material preparation example 1, ethylene- 5 parts of vinyl acetate copolymer, 1 part of amide dispersant;

(2) uniformly mixing oil-extended SBS, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 210°C for 2 hours, and then extrude at a die temperature of 150°C;

(4) Granulation.

Embodiment 2:

An additive for high-viscosity and high-elasticity asphalt, the difference from Example 1 is that the oil-extended SBS is prepared by selecting raw materials from Preparation Example 2.

Embodiment three:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 1 is that the oil-extended SBS is prepared by selecting raw materials from Preparation Example 3.

Embodiment 4:

An additive for high-viscosity and high-elastic asphalt is prepared by the following method:

(1) batching: according to parts by weight, weigh 4 parts of C5 petroleum resins, 4 parts of C9 petroleum resins, 7 parts of terpene resins, 5 parts of terpene phenolic resins, 65 parts of oil-extended SBS prepared by raw material preparation example 2, ethylene- 8 parts of vinyl acetate copolymer, 1.2 parts of amide dispersant;

(2) uniformly mixing oil-extended SBS, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 210°C for 2 hours, and then extrude at a die temperature of 150°C;

(4) Granulation.

Embodiment 5:

An additive for high-viscosity and high-elastic asphalt is prepared by the following method:

(1) batching: according to parts by weight, weigh 5 parts of C5 petroleum resins, 5 parts of C9 petroleum resins, 10 parts of terpene resins, 6 parts of terpene phenolic resins, 70 parts of oil-extended SBS prepared by raw material preparation example 2, ethylene- 10 parts of vinyl acetate copolymer, 1.5 parts of amide dispersant;

(2) uniformly mixing oil-extended SBS, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 205°C for 2 hours, and then extrude at a die temperature of 155°C;

(4) Granulation.

Embodiment 6:

An additive for high-viscosity and high-elastic asphalt is prepared by the following method:

(1) batching: according to parts by weight, weigh 6.5 parts of C5 petroleum resins, 6.5 parts of C9 petroleum resins, 12 parts of terpene resins, 7 parts of terpene phenolic resins, 75 parts of oil-extended SBS prepared by raw material preparation example two, ethylene- 12 parts of vinyl acetate copolymer, 1.7 parts of amide dispersant;

(2) uniformly mixing oil-extended SBS, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 210°C for 2 hours, and then extrude at a die temperature of 160°C;

(4) Granulation.

Embodiment 7:

An additive for high-viscosity and high-elastic asphalt is prepared by the following method:

(1) batching: according to parts by weight, weigh 7.5 parts of C5 petroleum resins, 7.5 parts of C9 petroleum resins, 15 parts of terpene resins, 8 parts of terpene phenolic resins, 80 parts of oil-extended SBS prepared by raw material preparation example two, ethylene- 15 parts of vinyl acetate copolymer, 2 parts of amide dispersant;

(2) uniformly mixing oil-extended SBS, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 210°C for 2 hours, and then extrude at a die temperature of 160°C;

(4) Granulation.

Embodiment 8:

An additive for high-viscosity and high-elastic asphalt is prepared by the following method:

(1) Ingredients: according to parts by weight, weigh 6.5 parts of C5 petroleum resin, 6.5 parts of C9 petroleum resin, 12 parts of terpene resin, 7 parts of terpene phenolic resin, 75 parts of TPU, 12 parts of ethylene-vinyl acetate copolymer, amide 1.7 parts of dispersant;

(2) uniformly mixing TPU, petroleum resin, terpene resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and amide dispersant to form a preform;

(3) Put the preform into a twin-screw extruder, shear and stir at 210°C for 2 hours, and then extrude at a die temperature of 160°C;

(4) Granulation.

Embodiment 9:

An additive for high-viscosity and high-elasticity asphalt, which is different from Example 8 in that the main material used is different, and 75 parts of TPU are replaced by 37.5 parts of oil-extended SBS and 37.5 parts of TPU.

Embodiment ten:

An additive related to Embodiment 1 to Embodiment 9, which is applied in paving OTFG permeable asphalt pavement.

Embodiment eleven:

An additive related to Embodiment 1 to Embodiment 9, the additive can also be used in high-viscosity and high-elasticity SMA asphalt mixed road pavement, airport overlay pavement, viaduct, and high-grade road.

Embodiment 12:

An additive related to the first embodiment to the ninth embodiment, the additive can also be used in the steel bridge deck pavement.

Comparative example 1:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 is the lack of ethylene-vinyl acetate copolymer.

Comparative example two:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 is the lack of terpene phenolic resin.

Comparative example three:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 is the lack of petroleum resin.

Comparative example four:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 is the lack of terpene resin.

Comparative example five:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 is the lack of petroleum resin and terpene resin.

Comparative Example 6:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 lies in the lack of petroleum resin and terpene phenolic resin.

Comparative example seven:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 6 is the lack of terpene resin and terpene phenolic resin.

Comparative Example 8: The high-viscosity asphalt modifier produced by Shenyang Yidao Technology Co., Ltd. was purchased as a reference.

Comparative example nine:

An additive for high-viscosity and high-elastic asphalt, the difference from Example 2 is that the thermoplastic elastomer adopts unoil-extended SBS.

testing method:

The raw materials used in this test are as follows: Coarse and fine aggregates: Beijing limestone crushed stone; Asphalt: No. 70 grade A road petroleum asphalt; Mineral powder: Mineral powder produced in Beijing with a fineness of 400m ² /kg; test basis Refer to "Asphalt and Asphalt Mixture Test Regulations for Highway Engineering" (JTG E20-2011) and "Technical Specification for Highway Asphalt Pavement Construction" (JTG F40-2004).

The asphalt used in this test is 70#A grade road petroleum asphalt. The test results are shown in the following table:

The type of mixture used in this test is AC-20C, and the specific gradation is shown in the following table:

(1) Bonding strength: The additives involved in the examples and the comparative examples were respectively added to 70# road asphalt, and the Marshall test was carried out under the condition that the oil-to-stone ratio was 4.4% according to the above synthetic grading ingredients. 0.4% of the total amount of asphalt mixture, the test results are shown in the following table:

From the above table, it can be seen that in Examples 1 to 3 and Comparative Example 9, it can be seen that the use of oil-extended SBS can promote the improvement of the overall strength of the asphalt mixture; The additive has excellent high viscosity, which can firmly bond the asphalt with the coarse aggregate and fine aggregate; according to the example sample and the comparative example 1, it can be seen that the blend of ethylene-vinyl acetate copolymer and tackifying resin can achieve Excellent high viscosity, so as to mix asphalt with coarse aggregates and fine aggregates; from Comparative Examples 2 to 7, it can be seen that petroleum resin, terpene resin and terpene phenolic resin are used to blend, and the three have a synergistic effect. , which can significantly improve the viscosity of the additive; it can be seen from each example and comparative example 8 that the performance of the additive of the present application is far superior to that of the commercial product, has a high viscosity increasing effect, and can improve the overall strength of the asphalt mixture; in addition, The additive of the present application has excellent water repellency and high residual degree after being soaked in water, which is also an important indicator reflecting the overall strength of the asphalt in use.

(2) Low temperature resistance: The additives involved in the examples and the comparative examples are respectively used and added to the 70# road asphalt. The amount of the additives is 0.4% of the total amount of the asphalt mixture. According to the above synthetic grading ingredients, the oil-to-stone ratio is Under the condition of 4.4%, the low temperature resistance test of AC-20C asphalt mixture test piece formed indoors is carried out. The test results are shown in the following table:

As can be seen from the above table, according to each example and comparative example 9, oil-extended SBS can significantly improve the low temperature resistance of asphalt compared with non-oil-extended SBS; Elastomers using TPU samples can achieve low temperature resistance equivalent to oil-extended SBS; according to each example and comparative example 1, it can be seen that adding ethylene-vinyl acetate copolymer has a promoting effect on the low temperature resistance of asphalt; according to comparative example 2 ~Comparative example 7 shows that petroleum resin, terpene resin and terpene phenolic resin have a synergistic effect, which can improve the low temperature resistance of asphalt in addition to the tackifying effect; The performance is obviously better than that of its peers.

(3) High elasticity: The specimen specification is a cylinder with a diameter of 100mm and a height of 100mm. The lateral method is used. Under each test condition, the dynamic load is applied for 200 cycles, and the stress and elastic strain amplitude of the last 5 cycles are taken. The average value is used to calculate the elastic modulus, and the test results are shown in the following table:

sample Dynamic elastic modulus (Mpa) Embodiment 2 9023.32 Embodiment 4 9056.27 Embodiment 5 9105.11 Embodiment 6 9168.39 Embodiment 7 9186.09 Comparative Example 1 8569.31 Comparative Example Eight 8633.29 Comparative Example Nine 8976.02

It can be seen from the above table that the additive of the present application has more excellent elasticity, and the amount of elastic deformation is very low. The addition of ethylene-vinyl acetate copolymer can promote the improvement of the high elastic properties of asphalt; the thermoplastic elastomer adopts oil-extended SBS, which has better high elasticity than the non-oil-extended sample.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (4)

1. The additive for the high-viscosity high-elasticity asphalt is characterized by being formed by mixing the following components in parts by weight:

5-15 parts of petroleum resin, 5-15 parts of terpene resin, 3-8 parts of terpene phenolic resin, 60-80 parts of thermoplastic elastomer, 5-15 parts of ethylene-vinyl acetate copolymer and 1-2 parts of amide dispersant; the thermoplastic elastomer is selected from one of oil-extended SBS and TPU or is prepared from the following components in percentage by weight of 1:1, compounding; the petroleum resin is C5 petroleum resin and C9 petroleum resin which are compounded in a weight ratio of 1: 1; the oil-extended SBS is prepared by the following method: soaking 10-15 parts by weight of aromatic oil in 100 parts by weight of SBS, standing for 1-2 hours, then placing the oil-filled SBS on an open mill, and blending for 30-45 min at 110-115 ℃; and (3) dripping 3-5 parts by weight of fatty alcohol-polyoxyethylene ether, and mixing uniformly.

2. An additive for high-viscosity high-elasticity asphalt as claimed in claim 1, wherein: the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 35-40%.

3. The method for preparing the additive for the high-viscosity high-elasticity asphalt as claimed in any one of claims 1 to 2, comprising the following steps:

(1) preparing materials: weighing 5-15 parts of petroleum resin, 5-15 parts of terpene resin, 3-8 parts of terpene phenolic resin, 60-80 parts of thermoplastic elastomer, 5-15 parts of ethylene-vinyl acetate copolymer and 1-2 parts of amide dispersant by weight;

(2) uniformly mixing a thermoplastic elastomer, petroleum resin, terpene phenolic resin, ethylene-vinyl acetate copolymer and an amide dispersant to form a preformed body;

(3) putting the preformed body into a double-screw extruder, shearing and stirring for 1.5-2 h at 205-215 ℃, and then extruding and molding by a die head at 150-160 ℃;

(4) and (6) granulating.

4. Use of an additive for high viscous and high elastic asphalt according to any of claims 1 to 3, wherein: the additive is applied to preparing high-elasticity and high-viscosity asphalt, paving OTFG (over the fiber reinforced plastic) permeable asphalt pavement, SMA (surface-mounted alloy) pavement or paving steel bridge surfaces.