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A kind of cation-doped starch microsphere material and its preparation method and application

A technology of starch microspheres and cationic monomers, which can be used in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., and can solve the problem that polydisperse starch microspheres are not reported.

Active Publication Date: 2021-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on polydisperse starch microspheres with cation doping and uniform particle size distribution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Weigh 12 parts of starch (sweet potato: mung bean = 1:1) and add it to 100 parts of deionized water, then add 20 parts of triethanolamine, and fully dissolve at 65°C. Then add 0.4 parts of epichlorohydrin, mix and react for 1.25h. Weigh 10 parts of monomer (DMC:DAC=1:1) into the starch solution, fully dissolve and mix. Add 0.18 parts of sodium persulfate at 80°C and react for 4 hours. Add 7.5 parts of dimethyl hydroxyhexadecyl sulfopropyl ammonium salt, and mix thoroughly to obtain the aqueous phase A. Take another 440 parts of alkane compound (n-heptane:cyclohexane=6:5), add 67.5 parts of emulsifier (sodium hexadecylbenzene sulfonate), stir at high speed to dissolve completely, and the obtained material liquid is the oil phase b. Slowly pour A into B at 47.5°C and weigh 20 parts of KNO 3 Prepare 140 parts of inorganic salt solution, and add it dropwise to the starch solution at the same temperature with 9.5 parts of epichlorohydrin at the same time. The time of con...

Embodiment 2

[0049] Weigh 5 parts of potato starch and add to 100 parts of deionized water, then add 20 parts of triethanolamine, fully dissolve at room temperature. Then add 0.04 parts of epichlorohydrin, mix and react for 2h. Weigh 5 parts of DEDAAC and add it into the starch solution, fully dissolve and mix. Add 0.07 parts of ammonium persulfate at 70°C and react for 4 hours. Add 4.5 parts of dimethyl hexadecyl ethyl ammonium sulfonate, mix thoroughly, and the resulting liquid is the aqueous phase A. Take another 250 parts of n-heptane, add 30 parts of emulsifier (Span40:Tween40=4:3), 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 30 parts of CaCl 2 Add and prepare 66 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, and add it at a constant speed for 8 hours, and continue to react for 2 hours after the...

Embodiment 3

[0051] Weigh 15 parts of sweet potato starch into 100 parts of deionized water, then add 35 parts of triethanolamine, and fully dissolve at 60°C. Then add 0.05 parts of epichlorohydrin, mix and react for 1.5h. Weigh 17.5 parts of DAC and add it into the starch solution, fully dissolve and mix. Add 0.1 part of initiator (potassium persulfate:ammonium persulfate=1:1) at 75°C and react for 5h. Add 6 parts of dimethyl (3-hydroxydodecyl) sulfopropyl ammonium salt, and mix thoroughly to obtain the aqueous phase A. Take another 420 parts of n-octane, add 37.5 parts of emulsifier (Span40:Tween20=3:1), stir at high speed to dissolve completely, and the obtained material liquid is oil phase B. Slowly pour A into B at 30°C, weigh 2.5 parts of K 2 SO 4 Prepare 30 parts of inorganic salt solution, and add it dropwise to the starch solution at the same temperature at the same time as 3.5 parts of epichlorohydrin. The time of constant dropwise addition is 7h, and the reaction is continue...

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PUM

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Abstract

The invention discloses a cation doped starch microsphere material and a preparation method and application thereof. The raw materials of the starch microspheres comprise: 100 parts of deionized water, 2-20 parts of starch, 10-45 parts of triethanolamine, 0.105-14.6 parts of epichlorohydrin, 0.5-17.5 parts of a cationic monomer, 0.001-0.2 part of an initiator, 0.05-10 parts of a zwitterionic surfactant, 300-800 parts of an alkane compound, 15-250 parts of an emulsifier, 0.5-200 parts of an inorganic salt solution and 300-800 parts of an organic solvent.

Description

technical field [0001] The invention belongs to the technical field of starch preparation, 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14C08F251/00C08F220/34C08F226/02C08J3/24
CPCB01J13/14C08F251/00C08J3/24C08J2303/02C09K8/035C09K8/516C08F220/34C08F226/02
Inventor 王晨杨超王陶张志智尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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