Modified asphalt particles and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-10851280-B2
Application number	US-201615772634-A
Country	US
Kind code	B2
Filing date	Nov 1, 2016
Priority date	Nov 2, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

Modified asphalt particles contain asphalt and a modifier. The modifier comprises poly-sulfur and free sulfur. The sulfur element accounts for 10-40 weight percent of the total amount of the modified asphalt particles, and the poly-sulfur accounts for 30-70 weight percent of the total amount of the sulfur element. The total particle size of the modified asphalt particle is smaller than or equal to 150 μm. The modified asphalt particles have an excellent high temperature performance, and can be used for preparing drilling fluids. Water-in-oil based drilling fluid obtained from the modified asphalt particles has low plastic viscosity, high dynamic shear force, high dynamic plastic ratio, and high emulsion-breaking voltage, and improves the high temperature resistance and cutting carrying capability of a system.

First claim

The invention claimed is:

1. A modified asphalt particle comprising asphalt and a modifier that contains poly-sulfur and free sulfur, wherein a total weight of the poly-sulfur and the free sulfur accounts for 10-40 wt % of a total weight of the modified asphalt particle, and the poly-sulfur accounts for 30-70 wt % of the total weight of the poly-sulfur and the free sulfur, wherein the modified asphalt particle has a particle size of less than or equal to 150 μm, and comprises a core and a shell covering the core, wherein the core has a particle size of 50-120 μm, and the shell has a thickness of 5-50 μm.

2. The modified asphalt particle according to claim 1 , wherein an infrared spectrogram of the modified asphalt particle has characteristic peaks of poly-sulfur within a range of 740-2960 cm −1 .

3. The modified asphalt particle according to claim 2 , wherein an infrared spectrogram of the modified asphalt particle has characteristic peaks of poly-sulfur in the vicinity of 740 cm −1 , 880 cm −1 , 1509 cm −1 , 1934 cm −1 , 2926 cm −1 , and 2960 cm −1 .

4. The modified asphalt particle according to claim 1 , wherein the poly-sulfur accounts for 55-70 wt % of the total weight of the poly-sulfur and the free sulfur.

5. The modified asphalt particle according to claim 1 , wherein, based on the total weight of the modified asphalt particle, the total weight of the poly-sulfur and the free sulfur is 15-35 wt %, and the asphalt is 65-85 wt %.

6. The modified asphalt particle according to claim 1 , wherein a softening point of the modified asphalt particle is 130-210° C.

7. The modified asphalt particle according to claim 1 , wherein the particle size of the modified asphalt particle is 90-120 μm, and based on the total weight of the modified asphalt particle, the content of the shell is 10-30 wt %, and the content of the core is 70-90 wt %.

8. A preparation method of modified asphalt particle of claim 1 , comprising the following steps:
(1) heating sulfur to a molten state wherein the molten sulfur comprises poly-sulfur and free sulfur, adding a pre-stabilizer into the molten sulfur, charging an inert gas, and holding at 0.5-2 MPa for 10-100 min., to form a liquid modifier;
(2) heating asphalt to a molten state under an airtight condition, and charging an inert gas so that the pressure is maintained at 0.2-1 MPa;
(3) controlling the liquid modifier obtained in the step (1) to contact with the molten asphalt obtained in the step (2), and holding for 10-60 min., wherein a mass ratio of the sulfur to the asphalt is 1-4:6-9;
(4) spraying the product obtained in the step (3) into a quenching liquid that contains a stabilizer for quenching;
wherein the pre-stabilizer is a substance that can bond with the sulfur atoms at two ends of the molecular chain of the poly-sulfur; the stabilizer is an alcohol.

9. The preparation method according to claim 8 , wherein the pre-stabilizer is alkene, dialkene, halogenated dialkene, halogenated aromatics, halogenated nitro-aromatics, or a mixture thereof;
and the added amount of the pre-stabilizer is 0.01-0.5 wt % of the sulfur.

10. The preparation method according to claim 8 , wherein the stabilizer is C3-10 monoalcohol or polyalcohol that are optionally substituted;
and the added amount of the stabilizer is 0.01-0.5 wt % of the sulfur.

11. The preparation method according to claim 8 , wherein the pre-stabilizer is 1 dodecene, 1-tetradecene, 1-octadecene, butadiene, chloroprene, isoprene, hexachloro-p-xylene, iodonitrobenzene, bromonitrobenzene, or a mixture thereof, and the stabilizer is isopropanol, 4-chloro-1-butanol, 6-chloro-1-hexanol, 4-bromobenzyl alcohol, or a mixture thereof.

12. The preparation method according to claim 8 , wherein the step of heating sulfur to a molten state is carried out at 250-350° C. for 10-60 min.

13. The preparation method according to claim 8 , wherein in the step (3), the liquid modifier obtained in the step (1) and the molten asphalt obtained in the step (2) are controlled to have a counter-flow contact.

14. The preparation method according to claim 8 , wherein a softening point of the asphalt is 120-200° C.

15. The preparation method according to claim 8 , wherein a concentration of the stabilizer in the quenching liquid is 0.001-0.1 wt %, a temperature of the quenching liquid is 0-50° C., and a quenching time during which the product contacts with the quenching liquid is 30-120 min.

16. A drilling fluid comprising the modified asphalt particle according to claim 1 .

17. The drilling fluid according to claim 16 , wherein an amount of the modified asphalt particle in the drilling fluid is 1-10 wt %.

18. The drilling fluid according to claim 16 , wherein an infrared spectrogram of the modified asphalt particle has characteristic peaks of poly-sulfur in the vicinity of 740 cm −1 , 880 cm −1 , 1509 cm −1 , 1934 cm −1 , 2926 cm −1 , and 2960 cm −1 .

19. The drilling fluid according to claim 16 , wherein a softening point of the modified asphalt particle is 130-210° C.

20. The drilling fluid according to claim 16 , wherein based on a total weight of the modified asphalt particle, a content of the shell is 10-30 wt %, and a content of the core is 70-90 wt %.

21. The drilling fluid according to claim 16 , wherein the particle size of the modified asphalt particle is 90-120 μm, a particle size of the core is 80-110 μm, and a thickness of the shell is 10-30 μm.

Assignees

• China Petroleum & Chem Corp
• Dalian Res Institute Of Petroleum And Petrochemicals Sinopec Corp

Inventors

• Fu Li
• Guo Jiaohe
• Yao Hanrong
• Liu Shuhua
• Zhang Jianfeng

Classifications

• C08L95/00 Primary

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C09K8/516

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title

• C09K8/035

  Organic additives · CPC title

• C08K3/06

  Sulfur · CPC title

• C09K8/24

  Polymers · CPC title