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Polymer modified asphalt and preparation method thereof

A technology for modifying asphalt and polymers, which is applied to building structures, building components, building insulation materials, etc., to achieve the effects of improved elongation, excellent performance, and excellent anti-aging performance

Inactive Publication Date: 2009-09-16
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Contents of the invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA) modified asphalt: heat 96 grams of base asphalt to completely melt, then slowly add grafted modified ethylene at a speed of 300 rpm - 4 grams of vinyl acetate copolymer (M-EVA), and then continue heating, the temperature is maintained at 170 ° C, under the rotating speed of 3000 rpm, high-speed shearing for 40 minutes, so that the high-temperature shear blending is uniform, It is the product of the present invention.

[0022] After inspection, the softening point of the obtained modified asphalt was 66°C, the penetration (100g, 5 seconds, 0.1 mm) was 55, and the low temperature elongation (5°C, 5cm / min, cm) was 9cm. Compared with base asphalt (softening point 45, penetration 78, elongation 5cm), the high temperature performance of the modified asphalt of the present invention has been significantly improved, and the low temperature performance has also been improved.

Embodiment 2

[0023] Example 2 Preparation of maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA) modified asphalt: 95 grams of base asphalt was heated until completely melted, and then, at a speed of 300 rpm, slowly added grafted modified asphalt 5 grams of permanent ethylene-vinyl acetate copolymer (M-EVA), and then continue to heat, the temperature is maintained at 170 ° C, and at a speed of 3000 rpm, high-speed shearing for 40 minutes to make it high-temperature shear blending Evenly, it is the product of the present invention.

[0024] After inspection, the softening point of the obtained modified asphalt was 69°C, the penetration (100g, 5 seconds, 0.1mm) was 48, and the low temperature elongation (5°C, 5cm / min, cm) was 12cm. Compared with the base asphalt (softening point 45, penetration 78, elongation 5cm), the high-temperature performance of the modified asphalt has been significantly improved, and the low-temperature performance has also been improved.

Embodiment 3

[0025] Example 3 Preparation of maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA) modified asphalt: 94 grams of base asphalt was heated until it was completely melted, and then, at a speed of 300 rpm, slowly added graft modified asphalt 6 grams of permanent ethylene-vinyl acetate copolymer (M-EVA), then continue heating, the temperature is maintained at 170 ° C, and at a speed of 3000 rpm, high-speed shearing for 40 minutes to make it high-temperature shear blending Evenly, it is the product of the present invention.

[0026] After inspection, the softening point of the obtained modified asphalt was 72°C, the penetration (100g, 5 seconds, 0.1mm) was 42, and the low temperature elongation (5°C, 5cm / min, cm) was 13cm. Compared with the base asphalt (softening point 45, penetration 78, elongation 5cm), the high-temperature performance of the modified asphalt has also been significantly improved, and the low-temperature performance has also been improved.

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Abstract

The invention relates to polymer modified asphalt and a preparation method thereof. The modified asphalt consists of base asphalt, maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA), styrene-butadiene rubber (SBR) and a tackifier. The preparation method comprises the following steps: heating the base asphalt to completely smelt; and then, slowly adding the maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA) modifying agent into the base asphalt by stirring; and cutting and blending the mixture at high speed to prepared the polymer modified asphalt. When the maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA) is used for the modified asphalt, a maleic anhydride group reacts with functional groups in the asphalt, so that the polymer and the asphalt perform crosslink to a certain extent, compatibility of the ethylene-vinyl acetate copolymer (EVA) and the asphalt can be improved, the high and low temperature performance of the asphalt is improved, and the polymer modified asphalt is a perfect material for road.

Description

technical field [0001] The invention relates to modified asphalt and its production method, in particular to polymer modified asphalt and its preparation method. Background technique [0002] At present, there are three main types of modified asphalt produced in China: one is rubber, including natural rubber (NR), styrene-butadiene rubber (SBR), polybutadiene (CR) and so on. Represented by styrene-butadiene rubber (SBR), it mainly improves the low-temperature performance of asphalt. Generally, the modified asphalt material can be applied in colder regions. The second is thermoplastic rubber, including styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), SBS hydrogenated copolymer (SEPS), etc. Highway polymerization The polymer used in modified asphalt is mostly SBS. SBS modified asphalt has good high and low temperature performance, and is widely used in the middle and upper layers of expressway surfaces, but its price is high, which limits its application. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L51/06
Inventor 王云普卢全陈久存李宏军颜小东魏铄蕴
Owner NORTHWEST NORMAL UNIVERSITY
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