A kind of starch microsphere and its synthesis method and application

A technology of starch microspheres and a synthesis method, which is applied in the field of microspheres and achieves the effects of satisfying broad spectrum, high content of microspheres and remarkable temporary blocking 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

[0039] Weigh 14 parts of wheat starch into 100 parts of deionized water, then add 17 parts of triethanolamine, and fully dissolve at 72°C. Then add 0.23 parts of epichlorohydrin, mix and react for 3h. Weigh 7 parts of NVP into the starch solution, fully dissolve and mix. Add 0.14 parts of potassium persulfate at 65°C and react for 6 hours. Add 6 parts of dimethyl cetyl sulfonyl butyl ammonium salt and mix well. Weigh 43 parts of NaCl to prepare 70 parts of inorganic salt solution, and drop them into the starch solution simultaneously with 2.2 parts of epichlorohydrin at 43°C for 5 hours at a constant speed. After the dropwise addition, the reaction was continued for 2 hours to obtain evenly distributed polydisperse starch microspheres. The particle size distribution range of the starch microspheres is 10-170 μm (93.5% of the particle size is within this range), and the particle size distribution in the particle size distribution range has the following characteristics: (10 ...

Embodiment 2

[0041] Weigh 5 parts of potato starch and add to 100 parts of deionized water, then add 41 parts of triethanolamine, fully dissolve at room temperature. Then add 0.04 epichlorohydrin, mix and react for 2h. Weigh 6 parts of AN and add it into the starch solution, fully dissolve and mix. Add 0.019 parts of ammonium persulfate at 70°C and react for 4 hours. Add 1 part dimethyl cetyl sulfonium ethyl ammonium salt and mix well. Weigh 0.5 parts of CaCl 2 Prepare 100 parts of inorganic salt solution, drop it into the starch solution simultaneously with 7.5 parts of epichlorohydrin at 60°C, and add it dropwise at a constant speed for 8 hours. After the dropwise addition, the reaction was continued for 2 hours to obtain evenly distributed polydisperse starch microspheres. The particle size distribution range of the starch microspheres is 50-210 μm (95.0% of the particle size is within this range), and the particle size distribution in the particle size distribution range has the fo...

Embodiment 3

[0043] Weigh 20 parts of tapioca starch into 100 parts of deionized water, then add 20 parts of triethanolamine, and fully dissolve at 40°C. Then add 0.3 parts of epichlorohydrin, mix and react for 1h. Weigh 7 parts of NVF and add it into the starch solution, fully dissolve and mix. Add 0.105 parts of sodium persulfate at 80°C and react for 3 hours. Add 10 parts of dimethyl octadecyl sulfonyl butyl ammonium salt and mix well. Weigh 3 parts of MgCl 2 Prepare 150 parts of inorganic salt solution, drop it into the starch solution simultaneously with 14 parts of epichlorohydrin at 40°C, and add it dropwise at a constant speed for 10 hours. After the dropwise addition, the reaction was continued for 2 hours to obtain evenly distributed polydisperse starch microspheres. The particle size distribution range of the starch microspheres is 50-300 μm (91.2% of the particle size is within this range), and the particle size distribution in the particle size distribution range has the f...

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Abstract

The invention discloses starch microspheres and a synthesis 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, 0.1-20 parts of a nonionic monomer, 0.001-0.2 part of an initiator, 0.05-10 parts of a zwitterionic surfactant, and 0.5-200 parts ofan inorganic salt solution. The starch microspheres have a particle diameter of 0.1 to 500 [mu]m and have uniformly distributed polydispersity. The starch microspheres prepared by the method are polydisperse starch microspheres having uniform particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of microspheres, and in particular relates to a starch microsphere and its synthesis 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 th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F226/10C08F220/44C08F226/02C08B31/12C08J3/24C09K8/514C09K8/516
CPCC08B31/12C08F251/00C08J3/24C08J2351/02C09K8/514C09K8/516C08F226/10C08F220/44C08F226/02
Inventor 杨国兴周成华杨超王晨
Owner CHINA PETROLEUM & CHEM CORP
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