A kind of preparation method of composite modified asphalt
A technology of composite modified asphalt and composite modifier, which is applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of easy segregation, avoid conventional shearing process, improve storage stability, and reduce production cost effect
Active Publication Date: 2019-11-01
HENAN NORMAL UNIV
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Problems solved by technology
However, the modified asphalt method realized by this physical dispersion method makes the segregation phenomenon between the two phases of SBS and asphalt very easy to occur, and this phenomenon is more serious during the preparation and use of star-shaped SBS modified asphalt
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[0015] The raw material composition ratio of composite modified asphalt in Examples 1-5 of the present invention is shown in Table 1:
[0016] Table 1 Raw material composition ratio of asphalt composite modifier
[0017] Example Polyphosphoric acid(Kg) SBS(Kg) Bitumen (Kg) 1 2 2 100 2 2 3 100 3 2 4 100 4 1 3 100 5 3 3 100
[0018] The preparation method of composite modified asphalt in the embodiment of the present invention 1-5 is:
[0019] a. Prepare various raw materials respectively according to the proportioning ratio of the above raw materials;
[0020] b. Heat the inorganic modifier polyphosphoric acid to 105°C and keep it warm;
[0021] c. Heat the organic modifier styrene-butadiene block copolymer SBS to 65°C, then add it to the heat-retained polyphosphoric acid, raise the temperature to 120°C, and stir at a speed of 120r / min until no obvious The presence of styrene-butadiene block copolymer particles makes asph...
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The invention discloses a preparation method of composite modified asphalt. The preparation method comprises the steps of heating 1-3 parts by weight of polyphosphoric acid as an inorganic modifying agent to 105 DEG C and performing heat preservation, heating 2-4 parts by weight of styrene-butadiene segmented copolymer as an organic modifying agent to 65 DEG C, then adding the styrene-butadiene segmented copolymer into the heat-preserving polyphosphoric acid, heating to 120 DEG C, stirring at the speed of 120r / min until obvious styrene-butadiene segmented copolymer particles do not exist so as to prepare a composite modifying agent, heating 100 parts by weight of asphalt to 135 DEG C, then adding the prepared asphalt composite modifying agent, and stirring for 30min at the speed of 500r / min at 135 DEG C to obtain the composite modified asphalt. The composite modified asphalt prepared by the preparation method improves both high-temperature performance and low-temperature performance obviously compared with SBS (styrene butadiene styrene) modified asphalt prepared by a conventional method; the storage stability is obviously improved as well; in the preparation process, the stabilizer adding step is omitted, the heating temperature in the production process is reduced to 135 DEG C from 190 DEG C, and the production difficulty and production cost are reduced while the energy is saved.
Description
technical field [0001] The invention belongs to the technical field of road building materials, and in particular relates to a preparation method of composite modified asphalt. Background technique [0002] With the rapid development of my country's economy, the road traffic volume is increasing year by year, and the performance requirements for asphalt pavement materials are also gradually increasing. The performance of base asphalt often cannot meet the stringent requirements of traffic environment and climatic conditions on asphalt pavement materials. Therefore, it is necessary to use modifiers to modify asphalt to improve the road performance of asphalt. Styrene-butadiene block copolymer SBS has good mechanical properties and has a good modification effect on asphalt. The most commonly used road asphalt modifiers in the world are divided into two types: linear and star in terms of the structure of SBS. Generally speaking, the effect of star SBS modified asphalt is bette...
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IPC IPC(8): C08L95/00C08L53/02C08K3/32
CPCC08K2003/329C08L95/00C08L2205/08C08L53/02C08K3/32
Inventor 张庆房立白正宇赖小伟李珊珊衡金梦牛洋娣黄茹梦
Owner HENAN NORMAL UNIV