Polyurethane/nano-composite modified asphalt and preparation method thereof

A nano-composite and modified asphalt technology, applied in building components, building thermal insulation materials, buildings, etc., can solve the problems of not obvious improvement effect and limited improvement range of asphalt performance in an all-round way, so as to improve the anti-rutting ability and improve the high temperature performance. Effect

Active Publication Date: 2014-06-04
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a polyurethane / nano-composite modified asphalt, which solves the problem that the overall improvement effect of industrial polymers on asphalt performance is not obvious, and the improvement range is limited

Method used

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  • Polyurethane/nano-composite modified asphalt and preparation method thereof
  • Polyurethane/nano-composite modified asphalt and preparation method thereof
  • Polyurethane/nano-composite modified asphalt and preparation method thereof

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preparation example Construction

[0022] The preparation method of the above-mentioned polyurethane / nano composite modified asphalt is specifically implemented according to the following steps:

[0023] Step 1, respectively weighing 2% to 15% of polyurethane, 0.1% to 5% of graphene oxide and 80% to 97.9% of matrix pitch according to mass percentage, and the sum of the mass percentages of the above components is 100%;

[0024] Step 2, heat the base asphalt to melt, keep the temperature at 150-200°C, add polyurethane and graphene oxide, manually stir for 20-40 minutes, then stir with shears for 80-100 minutes, cool down to 100-150°C, and place for 20-20 minutes 50min to make it fully swell;

[0025] In step 3, the asphalt mixture obtained in step 2 is sheared again on a shearing machine for 80 to 100 minutes, until the polyurethane and graphene oxide are uniformly dispersed in the asphalt, and the polyurethane / nano composite modified asphalt is obtained.

Embodiment 1

[0038] Take 80% of the base asphalt by mass and heat it to melt, keep the temperature at 180°C, add 15% of polyurethane and 5% of graphene oxide according to the mass percentage, manually stir for 20 minutes, stir with shears for 100 minutes, cool down to 100°C, and place for 20 minutes , to make it fully swell; shear the mixture again on a shearing machine for 100 minutes until the polyurethane and graphene oxide are uniformly dispersed in the asphalt.

[0039] The softening point of the polyurethane / nanocomposite modified asphalt obtained in Example 1 was measured to be 67.3° C., the penetration was 69.3 (0.1 mm), and the ductility was 69 cm.

Embodiment 2

[0041]Take 97.9% of the base asphalt by mass and heat it to melt, keep the temperature at 150°C, add 2% polyurethane and 0.1% graphene oxide according to the mass percentage, stir manually for 40 minutes, stir with shears for 80 minutes, cool down to 150°C, and place for 50 minutes , to make it fully swell; shear the mixture again on a shearing machine for 80 minutes until the polyurethane and graphene oxide are uniformly dispersed in the asphalt.

[0042] The softening point of the polyurethane / nanocomposite modified asphalt obtained in Example 2 was measured to be 63.2° C., the penetration was 68.7 (0.1 mm), and the ductility was 73 cm.

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Abstract

The invention provides polyurethane / nano-composite modified asphalt. The polyurethane / nano-composite modified asphalt comprises the following components in percentage by mass: 2%-15% of polyurethane, 0.1%-5% of graphene oxide and 80%-97.9% of matrix asphalt, wherein the sum of the mass percentage of the components is 100%. A preparation method of the polyurethane / nano-composite modified asphalt comprises the following steps: heating and melting the matrix asphalt, maintaining temperature at 150-200 DEG C, adding the polyurethane and the graphene oxide, manually mixing for 20-40 minutes, then stirring for 80-100 minutes by using a shearing machine, cooling to 100-150 DEG C, standing for 20-50 minutes, and shearing an asphalt mixture by using the shearing machine again for 80-100 minutes till the polyurethane and the graphene oxide are uniformly dispersed in the asphalt, thus obtaining the polyurethane / nano-composite modified asphalt. The preparation method has the advantages that the polyurethane and the graphene oxide are used as modifying agents, a two-step method modification technology is adopted so as to give full play to good performances of the polymer and nanometer materials, and the high-temperature performance and anti-modification capacity of the matrix asphalt and the anti-rutting capacity of asphalt pavements are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a polyurethane / nano composite modified asphalt, and also relates to a preparation method of the polyurethane / nano composite modified asphalt. Background technique [0002] With the increase of high-grade highway traffic volume, high vehicle speed, increasingly heavy axle load, and performance defects such as high wax content, poor cohesive force, low elongation, and high temperature sensitivity of domestic ordinary asphalt, the pavement of high-grade highways is formed. various serious diseases. [0003] Practice has proved that polymer modified asphalt can significantly reduce temperature sensitivity, improve the road performance of asphalt, and prolong the service performance of pavement. In order to improve the temperature sensitivity of asphalt, rubber, resin, thermoplastic elastomer and other polymers are usually added, such as styrene-butadiene rubber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L75/04C08K3/04
Inventor 方长青于瑞恩程有亮周星
Owner XIAN UNIV OF TECH
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