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Method for preparing nanoclay/styrene-butadiene rubber powder modified asphalt by adopting spray drying method

A spray-drying, styrene-butadiene rubber technology, applied in building components, building insulation materials, buildings, etc., can solve the problems of insignificant high-temperature stability of asphalt, reduced service performance of asphalt pavement, and impaired low-temperature performance of asphalt, etc. Excellent road performance, improved interaction, low cost effect

Active Publication Date: 2016-04-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Styrene-butadiene rubber can improve the low-temperature performance of asphalt (Wang Changan, Wu Yuliang, Xu Kai's research progress on butadiene-styrene copolymer modified asphalt [J]. Synthetic Rubber Industry 2006, 1(29): 71-75), but The effect of improving the high temperature stability of asphalt is not obvious. At the same time, there are great differences in relative molecular weight, chemical structure and composition between styrene-butadiene rubber and asphalt matrix, and long-term storage is prone to segregation and stratification.
Moreover, styrene-butadiene rubber is prone to aging and degradation during the use of asphalt, which reduces the performance of asphalt pavement and shortens the service life
Clay-modified asphalt can significantly improve the high-temperature performance and aging resistance of asphalt pavement (Xinde Tang, Zhongguo He, Wenjun Yin, et al., Nano-montmorillonite / SBS modified asphalt and its modification mechanism[J] Petroleum Asphalt, 2008, 22( 6): 10-13), but the clay sheet will limit the displacement of asphalt at low temperature, reduce the low temperature ductility, and damage the low temperature performance of asphalt

Method used

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  • Method for preparing nanoclay/styrene-butadiene rubber powder modified asphalt by adopting spray drying method
  • Method for preparing nanoclay/styrene-butadiene rubber powder modified asphalt by adopting spray drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get 60g montmorillonite, add 1140g water, stir 180min under the stirring speed of 300r / min and obtain the clay suspension that solid content is 5%, get 1200g solid content and be that 5% clay suspension joins 500g mass fraction and be 20% butane Mix evenly with benzene latex to obtain a mixed solution, and spray-dry to obtain 160g of clay / styrene-butadiene rubber powder with a particle size of 33μm. Take 160g of clay / styrene-butadiene rubber powder and 8000g of No. 70 petroleum asphalt at 160 ° C for 15 minutes, and then mix it at 2000rr / min shearing machine for 60min to obtain nano-clay / styrene-butadiene rubber modified asphalt.

Embodiment 2

[0025] Get 100g of kaolin, add 300g of water, stir at a stirring speed of 800r / min for 240min to obtain a clay suspension with a solid content of 25%, take 400g of a solid content of 25% clay suspension and join 250g of styrene-butadiene latex with a mass fraction of 40% Mix uniformly in the medium to obtain a mixed solution, and spray-dry to obtain 200g of clay / styrene-butadiene rubber powder with a particle size of 100μm. Take 200g of clay / styrene-butadiene rubber powder and 1000g of No. 100 petroleum asphalt at 200°C for 30min, and then mix it at 6000r / min shear 120min in a special shearing machine to obtain nanoclay / styrene-butadiene rubber modified asphalt.

Embodiment 3

[0027] Get 70g of silica, add 630g of water, stir at a stirring speed of 300r / min for 100min to obtain a clay suspension with a solid content of 10%, take 700g of a solid content of 10% clay suspension and join 500g of styrene-butadiene latex with a mass fraction of 20% Mix uniformly in the medium to obtain a mixed solution, and spray-dry to obtain 170g of clay / styrene-butadiene rubber powder with a particle size of 39μm. Take 170g of clay / styrene-butadiene rubber powder and 3400g of No. 90 petroleum asphalt at 165°C for 15min, and then mix it at 3000r / min Shearing for 60 minutes in a special shearing machine to obtain nanoclay / styrene-butadiene rubber modified asphalt.

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Abstract

The invention discloses a method for preparing nanoclay / styrene-butadiene rubber powder modified asphalt by adopting the spray drying method. The method comprises the following steps: preparing a clay suspension; preparing a mixed liquor of the clay suspension and butadiene-styrene latex; spray-drying the mixed liquor to prepare clay / butadiene-styrene rubber powder, so as to serve as an asphalt modifier; mixing the asphalt modifier with matrix asphalt according to a certain proportion, and shearing with a high speed shearing machine, so as to obtain the nanoclay / styrene-butadiene rubber compound modified asphalt. The preparation method provided by the invention is simple in process and low in cost, and at the same time the prepared compound modified asphalt has excellent high-and-low temperature performance and ageing resistance, and is also improved in the storage stability.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and relates to a spray drying method for preparing nano-clay / styrene-butadiene rubber powder modified asphalt. Background technique [0002] In recent years, my country's highway industry has developed rapidly, and asphalt has been widely used as the main pavement material. However, the asphalt that plays a bonding role in ordinary matrix asphalt pavement is a viscoelastic material with a relatively low molecular weight and a wide distribution. Phenomena such as rutting, cracking and aging are produced. Modification of asphalt can improve the high and low temperature performance of asphalt and prolong the service life of the pavement. Therefore, modified asphalt has become the main road material for high-grade highways. [0003] Among the existing methods for preparing modified asphalt, there are styrene-butadiene rubber modified asphalt and clay modified asphalt. Styrene-buta...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L9/06C08K3/34
CPCC08K2201/011C08L95/00C08L2201/08C08L9/06C08K3/346
Inventor 李晓林于源王益庆郑广宇沈家锋张立群
Owner BEIJING UNIV OF CHEM TECH
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