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Polymer-modified asphalt with a crosslinking agent and methods of preparing

A technology of cross-linked polymers and modified asphalt, which is applied in the direction of cohesive pavement paved on site, building structures, roads, etc.

Inactive Publication Date: 2012-11-07
ICL PERFORMANCE PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is recognized in the art that the sequence of addition leads to cost-effective modified bitumen with acceptable rheological properties

Method used

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  • Polymer-modified asphalt with a crosslinking agent and methods of preparing
  • Polymer-modified asphalt with a crosslinking agent and methods of preparing
  • Polymer-modified asphalt with a crosslinking agent and methods of preparing

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preparation example Construction

[0049] Anti-stripping agents may also be added to the process of the present invention for preparing crosslinked, polymer-modified asphalts or paving compositions containing such asphalts.

[0050] In certain embodiments, the anti-stripping agent is an alkaline anti-stripping agent, preferably slaked lime. Slaked lime contains calcium hydroxide (Ca(OH) 2 ). Commercially available slaked lime is a dry powder obtained by treating quicklime (calcium oxide, CaO) with sufficient water to satisfy its chemical affinity for water to convert the oxides to hydroxides.

[0051] Slaked lime used to prepare the paving composition may be added to aggregate, asphalt, or both according to any suitable method. There are several proven and effective methods of adding slaked lime to asphalt. Examples of this method include injecting hydrated lime into a drum mixer, adding lime to a mud mixer, adding dry hydrated lime to wetted aggregate, or adding lime slurry to wetted or unwetted aggregate (...

Embodiment 1

[0095] Tables 1A and 1B show the results using Paramount PG 58-28. In sample 1, polyphosphoric acid was added first, SBS second, and sulfur third. In sample 2, sulfur was added first, polyphosphoric acid second, and SBS third. Concentrations of additives and mixing times between additives are shown in Table 1A. When adding sulfur first, the recovery rate (%) measured by MSCR increased from 60.2 to 70.9, while the non-recoverable creep compliance J measured by MSCR nr From 0.23 to 0.08. Sample 3 tested only SBS polymer and sulfur (no polyphosphoric acid added). The absence of polyphosphoric acid resulted in lower recovery rate (%) and higher non-recoverable creep compliance.

[0096] Table 1A

[0097]

[0098]

[0099] Table 1B

[0100]

[0101]

[0102] Tables 2A and 2B show the results using BP PG58-28. In sample 4, polyphosphoric acid was added first, SBS second, and sulfur third. In sample 5, sulfur was added first, and then polyphosphoric acid and SBS w...

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Abstract

Methods of preparing a cross-linked, polymer-modified asphalt is provided. The method involves adding a crosslinking agent to asphalt prior to the addition of a crosslinkable polymer and an acid. Asphalt prepared by the disclosed methods exhibit improved properties such as properties measured by the Multiple Stress Creep Recovery (MSCR) test.

Description

Background technique [0001] Various polymer-modified asphalt compositions and methods of making various polymer-modified asphalts for use in paving and roofing slabs are known. The extent to which the polymer improves the properties of the bitumen depends on the compatibility of the polymer with the bitumen, eg, the polymer in a mixture of bitumen and polymer does not separate during storage. Highly compatible or compatibilized polymers are more effective at providing improved properties. A wide range of additives have been used to "crosslink" polymers or bitumen, thereby compatibilizing the mixture. For example, sulfur is a well known crosslinking agent (US Patent No. 4,145,322 and US Patent No. 4,242,246). The standard method is to first add the polymer to the bitumen, followed by mixing and then adding the crosslinker. In some cases, the sulfur is added to the bitumen, and then the polymer is somehow added to the bitumen and sulfur (US Patent No. 5,672,642 and US Patent ...

Claims

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Application Information

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IPC IPC(8): C08L95/00
CPCC08L2555/50C08L95/00D06N5/00C08L2555/54E01C7/18C08L2555/84Y02A30/30C08L53/02C08L91/06C08H99/00C08F297/04
Inventor D·C·菲R·玛尔多纳多E·E·罗玛戈萨
Owner ICL PERFORMANCE PROD
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