Polymer modified asphalt and producing method thereof

A technology of modified asphalt and a production method, which is applied in building structures, building components, building thermal insulation materials, etc., can solve the problems of damaging the low-temperature performance of modified asphalt, excessive waste rubber powder, and poor high-temperature resistance performance, and achieve improved performance. , The effect of increasing compatibility and excellent high temperature performance

Inactive Publication Date: 2008-01-16
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content is that desulfurized rubber powder, asphalt and compatibilizer are prepared by high-speed shear stirring or colloid mill grinding at relatively high temperature. Since the modifier is desulfurized rubber powder, it has good solubility and swelling properties in asphalt At the same time, because desulfurization produces more active groups on the surface of rubber powder, it is beneficial to the chemical bonding of rubber powder and asphalt, and the price is cheap, but its disadvantage is that the high temperature resistance is poor, and the amount of waste rubber powder used is relatively large. Suitable for on-site construction and paving of highways
[0004] Many patents have been applied for polyethylene and polypropylene modified asphalt, but the modified asphalt obtained by directly using modified asphalt requires a lot of polyethylene and polypropylene content to obtain modified asphalt with high softening point, but at the same time polyethylene and polypropylene The increase of polypropylene content brings about a substantial decrease in the low-temperature ductility of modified asphalt, which damages the low-temperature performance of modified asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, maleic anhydride modified low density polyethylene modified asphalt

[0021] Component Weight Fraction

[0022] No. 90 Asphalt A 100.00

[0023] P&A G-LDPE 4.00

[0024] Preparation method:

[0025] Turn on the intermeshing co-rotating twin-screw extruder with an aspect ratio of 36, set the temperatures in zones 1, 2, 3, and 4 to 150°C, 170°C, 170°C, and 190°C, respectively, and adjust the speed to 20Hz.

[0026] When heating 100.00 parts of No. 90 asphalt to 120°C, add 4 parts of P&A G-LDPE and stir for 5 minutes. Add it to the feed port of an intermeshing co-rotating twin-screw extruder for extrusion reaction to obtain MAH-g-LDPE modified asphalt.

[0027] The softening point of the obtained modified asphalt is 71°C; when the temperature is 25°C, the penetration is 26dmm; the ductility (5°C, 5cm / min, cm) is 34.

[0028] As a comparison, low-density polyethylene (LDPE 18D) is used to modify base asphalt, the preparation process is the same as above, ...

Embodiment 2

[0034] Embodiment 2, maleic anhydride modified high-density polyethylene modified asphalt

[0035] Component Weight Fraction

[0036] No. 90 Asphalt A 100.00

[0037] HAD-14 6.00

[0038] Preparation method:

[0039] Turn on the intermeshing co-rotating twin-screw extruder with an aspect ratio of 36, set the temperatures in zones 1, 2, 3, and 4 to 150°C, 170°C, 170°C, and 190°C, respectively, and adjust the speed to 20Hz.

[0040] When heating 100.00 parts of No. 90 asphalt to 140°C, add 6 parts of HAD-14 and stir for 5 minutes. Add it to the feed port of an intermeshed co-rotating twin-screw extruder for extrusion reaction to obtain MAH-g-HDPE modified asphalt.

[0041] The softening point of the obtained modified asphalt is 95°C; the penetration is 15dmm at 25°C; the ductility (5°C, 5cm / min, cm) is 7.

[0042] As a comparison, high-density polyethylene (HDPE 6200) is used to modify the base asphalt, the preparation process is the same as above, and the components are as...

Embodiment 3

[0048] Embodiment 3, maleic anhydride modified random polypropylene modified asphalt

[0049] Component Weight Fraction

[0050] No. 90 Asphalt A 100.00

[0051] P&A G-PP 3.00

[0052] Preparation method:

[0053] Turn on the intermeshed co-rotating twin-screw extruder with an aspect ratio of 36, set the temperatures in zones 1, 2, 3, and 4 to 120°C, 150°C, 150°C, and 190°C, respectively, and adjust the speed to 25Hz.

[0054] When heating 100 parts of No. 90 asphalt to 120°C, add 3 parts of P&A G-PP and stir for 5 minutes. Add it to the feed port of an intermeshing co-rotating twin-screw extruder for extrusion reaction to obtain P&A G-PP modified asphalt.

[0055] The softening point of the obtained modified asphalt is 68°C; when the temperature is 25°C, the penetration is 28dmm; the ductility (5°C, 5cm / min, cm) is 42cm.

[0056]As a comparison, atactic polypropylene (APP-A) is used to modify base asphalt, the preparation process is the same as above, and the components ...

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Abstract

The invention discloses a polymer modified asphalt and a product method of the polymer modified asphalt. The polymer modified asphalt of the invention comprises the components of basic asphalt and maleic anhydride modified polyolefin, wherein, the amount of the maleic anhydride modified polyolefin is 1 to 6 percent of the weight of the basic asphalt. The maleic anhydride is grafted on the chain of polyethylene or polypropylene, so that maleic anhydride grafted modified polyethylene and polypropylene are formed. Because the groups of anhydride are easy to have reaction with the functional groups of the asphalt, the compatibility of the polyethylene and / or polypropylene with the asphalt is enhanced, various performances of the modified asphalt are increased. The modified asphalt prepared by the maleic anhydride modified polyolefin being modified has excellent high temperature performance, meanwhile does not decrease or decreases little low temperature performance. Moreover, no rut will be formed when the modified asphalt is used on the surface of the expressway.

Description

technical field [0001] The invention relates to modified asphalt and a production method thereof, in particular to a polymer modified asphalt and a production method thereof. Background technique [0002] At present, the polymers of polymer modified asphalt are mainly SBS, LDPE, EVA, APAO, APP or IPP and their mixtures. The polymer used in the polymer modified asphalt of expressway is mostly SBS. SBS modified asphalt has good high and low temperature performance, and is widely used in the middle and upper layers of the expressway surface. But its price is high, and the dosage is 4-6%, which limits the application on a larger scale. Therefore, it is very important to develop new methods of high temperature resistant modified asphalt. [0003] Chinese patent CN20030910 introduces desulfurized rubber powder modified asphalt. The content is that desulfurized rubber powder, asphalt and compatibilizer are prepared by high-speed shear stirring or colloid mill grinding at relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L51/06C08L21/00
Inventor 张玉贞李军刘延军张玉霞
Owner CHINA NAT OFFSHORE OIL CORP
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