Preparation method of composite modified asphalt

A technology of compound modified asphalt and compound modifier, applied in building components, building insulation materials, buildings, etc., can solve problems such as easy segregation, avoid conventional shearing process, improve compatibility, and simple process Effect

Active Publication Date: 2017-09-22
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Preparation method of composite modified asphalt

Examples

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Embodiment

[0015] The raw material composition ratio of the composite modified asphalt in Examples 1-5 of the present invention is shown in Table 1:

[0016] Table 1 The raw material composition ratio of asphalt composite modifier

[0017] Example

Polyphosphoric acid (Kg)

SBS(Kg)

Asphalt (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 the composite modified asphalt in Examples 1-5 of the present invention is:

[0019] a. Prepare various raw materials according to the above raw material composition ratio;

[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 insulated polyphosphoric acid, heat up to 120°C, and stir at 120r / min until there is no obvious Styrene-butadiene block copolymer particles exist to prepare asphalt composite modifier;

[0022] d. Heat the asphalt to 135°C, then add the asphalt composite modifier prepared abo...

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Abstract

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 specifically relates to a preparation method of composite modified asphalt. Background technique [0002] With the rapid development of my country's economy, highway traffic has increased year by year, and the performance requirements of asphalt pavement materials have gradually increased. The performance of base asphalt often cannot meet the harsh requirements of traffic environment and weather conditions on asphalt pavement materials. Therefore, it is necessary to use modifiers to modify the asphalt to improve the road performance of the asphalt. The styrene-butadiene block copolymer SBS has good mechanical properties and has a good modification effect on the asphalt. It has become The most commonly used road asphalt modifiers in the world are divided into linear and star-shaped from the structure of SBS. Generally speaking, the effect of star-shaped SBS modified asphalt is bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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