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Epoxy-terminated low molecular weight polyethylene asphalt modifier and preparation method thereof

A low-molecular-weight polyethylene and asphalt modifier technology, applied in the field of asphalt additives, can solve the problems of harmful emissions, increased energy consumption, asphalt aging, etc., and achieve the effect of increased energy consumption

Active Publication Date: 2022-05-10
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Furthermore, this situation leads to asphalt aging, harmful emissions and increased energy consumption

Method used

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  • Epoxy-terminated low molecular weight polyethylene asphalt modifier and preparation method thereof
  • Epoxy-terminated low molecular weight polyethylene asphalt modifier and preparation method thereof
  • Epoxy-terminated low molecular weight polyethylene asphalt modifier and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Vacuumize in a closed reactor, mix 240ml cyclohexane, 10ml methylalumoxane and 100mg polyethylene catalyst (2,4-diMePh) 2 PBIMe 2 FeCl 2 , into the reactor, and keep the vacuum during the whole process, the reactor is filled with hydrogen and ethylene gas with a volume ratio of 1:1, the reaction temperature is 80 ° C, and the reaction is stirred for 1 hour to obtain the first product;

[0034] (2) mixing the first product with anhydrous methanol, precipitating the obtained solid, filtering, washing, and vacuum drying to obtain the second product;

[0035] (3) Stir 5g of the second product and 100ml of toluene at 70°C until completely dissolved. After dropping to 60°C, quickly add 3.5g of m-chloroperbenzoic acid under a nitrogen atmosphere. After 2.5 hours of reaction, the polymer is washed with a large amount of methanol Precipitate, wash with alcohol, filter, and vacuum dry at 50°C for 12 hours to obtain the epoxy-terminated low molecular weight polyethylene;

...

Embodiment 2

[0038] (1) Vacuumize in a closed reactor, mix 240ml cyclohexane, 10ml methylalumoxane and 100mg polyethylene catalyst (2,4-diMePh) 2 PBIMe 2 FeCl 2 , into the reactor, and keep the vacuum during the whole process, the reactor is filled with hydrogen and ethylene gas with a volume ratio of 1:2, the reaction temperature is 100°C, and the reaction is stirred for 2 hours to obtain the first product;

[0039] (2) mixing the first product with anhydrous methanol, precipitating the obtained solid, filtering, washing, and vacuum drying to obtain the second product;

[0040] (3) Stir 5g of the second product and 100ml of toluene at 100°C until completely dissolved. After dropping to 65°C, quickly add 3.5g of m-chloroperbenzoic acid under a nitrogen atmosphere. After reacting for 5 hours, the polymer is washed with a large amount of methanol Precipitate, wash with alcohol, filter, and vacuum dry at 50°C for 12 hours to obtain the epoxy-terminated low molecular weight polyethylene

[00...

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Abstract

The invention provides an epoxy-terminated low-molecular-weight polyethylene asphalt modifier and a preparation method thereof, the epoxy-terminated low-molecular-weight polyethylene asphalt modifier is obtained by a method of reducing the molecular weight of polyethylene and adding a functional group at the tail end of a polyethylene chain, the melting point of epoxy-terminated low-molecular-weight polyethylene is 105-110 DEG C, and the molecular weight of the epoxy-terminated low-molecular-weight polyethylene asphalt modifier is 50-80%. The preparation method comprises the following steps: carrying out catalytic polymerization on cyclohexane, methylaluminoxane and a polyethylene catalyst, precipitating, washing, drying, and reacting with m-chloroperbenzoic acid to obtain the epoxy-terminated low molecular weight polyethylene. The asphalt modifier can effectively reduce the difference value of softening points at the top and the bottom of modified asphalt, improve the storage stability of polyethylene modified asphalt and the high-temperature performance of a pavement, reduce the mixing and compacting temperature, save energy consumption and reduce emission.

Description

technical field [0001] The invention relates to an asphalt additive, especially an asphalt additive of epoxy-terminated low molecular weight polyethylene. Background technique [0002] Asphalt is widely used as a road material all over the world. Heavier loads, higher traffic volumes and seasonal temperature changes are significant causes of asphalt pavement failure. Asphalt is often mixed with additives to improve pavement performance. Polyethylene (PE) modifiers improve bitumen performance at lower cost. [0003] According to previous studies on PE-modified bitumen, PE has a positive effect on bitumen properties, such as resistance to deformation and reduced temperature sensitivity. However, PE for asphalt modification has some disadvantages. The main problem is the low storage stability, which leads to separation of PE from the system. This problem is the main factor limiting the widespread application of this type of bitumen modification technology. Functionalizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L23/26C08F8/08C08F110/02
CPCC08L95/00C08F8/08C08L23/26C08F110/02
Inventor 颜录科李孟茹晁敏朱留毓李化毅骆春佳陈涛
Owner CHANGAN UNIV
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