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A kind of micron cross-linked starch microsphere and its preparation method and application

A technology of starch microspheres and starch, applied in the field of microspheres, to achieve the effects of broad spectrum, uniform particle size distribution, and remarkable temporary plugging effect

Active Publication Date: 2020-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on homogeneously distributed polydisperse starch microspheres

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 10 parts of cornstarch into 100 parts of deionized water, then add 10 parts of triethanolamine, and fully dissolve at 80°C. Then add 0.005 parts of epichlorohydrin, mix and react for 3h. Add 1 part of dimethyl dodecyl sulfopropyl ammonium salt, mix well, and the obtained material liquid is the aqueous phase A. Take another 800 parts of cyclohexane, add 250 parts of emulsifier (Span80:Tween60=3:2), stir at high speed to dissolve completely, and the obtained material liquid is oil phase B. Slowly pour A into B at 50°C, weigh 50 parts of NaCl to prepare 200 parts of inorganic salt solution, and slowly drop them into the mixed phase at the same temperature with 7.5 parts of epichlorohydrin at a constant speed for 5 hours , After the dropwise addition was completed, the reaction was continued for 2h. Then stop the reaction, add 200 parts of absolute ethanol as an organic solvent to the mixed phase for demulsification, filter off the upper oil phase, wash the microsph...

Embodiment 2

[0042] Weigh 5 parts of potato starch into 100 ml of deionized water, then add 15 parts of triethanolamine, and fully dissolve at 20°C. Then add 0.04 parts of epichlorohydrin, mix and react for 2h. Add 0.05 parts of dimethyl hexadecyl ethyl ammonium sulfonate, mix thoroughly, and the obtained feed liquid is the aqueous phase A. Take another 1000 parts of n-octane, add 30 parts of emulsifier (Span60:Tween80=2:3 mass-to-number ratio), stir at high speed to dissolve completely, and the obtained material liquid is oil phase B. Slowly pour A into B at 60 °C, and weigh 0.5 parts of CaCl 2 Prepare 40 parts of inorganic salt solution, and add it dropwise to the starch solution at the same temperature with 1 part of epichlorohydrin at the same time. The time of constant dropwise addition is 8 hours, and the reaction is continued for 2 hours after the addition is completed. Then stop the reaction, add 500 parts of 1-butanol as an organic solvent to the mixed phase for demulsification,...

Embodiment 3

[0044] Weigh 20 parts of tapioca starch into 100 parts of deionized water, then add 50 parts of triethanolamine, and fully dissolve at 40°C. Then add 0.6 parts of epichlorohydrin, mix and react for 1.5h. Add 10 parts of dimethyl octadecyl sulfonyl butyl ammonium salt, mix well, and the obtained material liquid is the water phase A. Take another 500 parts of chloropentane, add 100 parts of emulsifier (Span60:Tween60=2:1), stir at high speed to dissolve completely, and the obtained material liquid is oil phase B. Slowly pour A into B at 40°C and weigh 20 parts of MgCl 2 Prepare 150 parts of inorganic salt solution, and add it dropwise into the starch solution at the same temperature with 14 parts of epichlorohydrin at a constant speed for 10 hours. After the dropwise addition, continue to react for 2 hours, then stop the reaction, add 200 parts of ethyl acetate as an organic solvent to the mixed phase for demulsification, filter off the upper oil phase, and wash the microspher...

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Abstract

The invention discloses micron-order crosslinked starch microspheres and a preparation method and application thereof. The raw materials of the starch microspheres comprise: 100 parts of deionized water, 1-20 parts of starch, 10-50 parts of triethanolamine, 0.105-14.6 parts of epichlorohydrin, 200-1000 parts of an alkane compound, 8-250 parts of an emulsifier, 0.05-10 parts of a zwitterionic surfactant, 0.5-200 parts of an inorganic salt solution and 200-1000 parts of an organic solvent. The starch microspheres have a particle diameter of 0.1 to 500 [mu]m and have a polydispersity characteristic that the particle sizes are uniformly distributed.

Description

technical field [0001] The invention belongs to the technical field of microspheres, and in particular relates to a starch microsphere and its preparation method and application. Background technique [0002] Shielding temporary plugging to protect oil and gas layer drilling technology (referred to as shielding temporary plugging technology) is mainly used to solve the problem of protecting oil and gas layers in multi-pressure formations in open hole sections, that is, to use two factors that damage oil and gas layers during drilling into oil and gas layers. The unfavorable factors (pressure difference and drilling fluid solid phase particles) are converted into favorable factors to protect oil and gas layers, and the purpose of reducing the damage to oil and gas layers caused by drilling fluid, cement slurry, pressure difference and soaking time is achieved. [0003] The basic idea of ​​shielding temporary plugging protection oil and gas layer drilling technology is to use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/00C09K8/035C09K8/514C09K8/516
CPCC08B31/003C09K8/035C09K8/514C09K8/516
Inventor 杨国兴周成华杨超王晨
Owner CHINA PETROLEUM & CHEM CORP
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