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SiO2@paraffin nano-particle with core-shell structure and preparation method thereof

A nanoparticle, core-shell structure technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effects of reducing costs, improving the production process, and shortening the process

Active Publication Date: 2020-06-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nano-SiO 2 As the core, there are few reports on the application of core-shell structure materials with polymer materials as the film-coated shell in the oil and gas industry.

Method used

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  • SiO2@paraffin nano-particle with core-shell structure and preparation method thereof
  • SiO2@paraffin nano-particle with core-shell structure and preparation method thereof
  • SiO2@paraffin nano-particle with core-shell structure and preparation method thereof

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preparation example Construction

[0034] This application document also discloses a SiO with core-shell structure 2 @ The preparation method of paraffin nanoparticles, which specifically includes the following steps: S1) S1) prepare the oil phase: paraffin and nano-SiO 2 Add N,N dimethylcyclohexylamine and stir until the paraffin is completely dissolved, then add emulsifier A and stir until completely dissolved to obtain an oil phase;

[0035] S2) Prepare the water phase: add the emulsifier B to deionized water, stir until the emulsifier B is completely dissolved, and obtain the water phase;

[0036] S3) preparing O / W emulsion: after mixing the oil phase and the water phase, stirring and emulsifying to obtain an O / W emulsion;

[0037] S4) Preparation of SiO 2 @paraffin nanoparticles: Introduce carbon dioxide into the O / W emulsion, paraffin is precipitated and coated on SiO 2 SiO with a core-shell structure formed on the surface 2 @paraffin nanoparticles, SiO obtained after centrifugation2 @paraffin nanopar...

Embodiment 1

[0048] The SiO of core-shell structure prepared by the present invention 2 @paraffin nanoparticles were prepared as follows:

[0049] S1) 0.5g of paraffin and 0.5g of nano-SiO 2 Particles (average particle size: 50nm) are completely dissolved in 5.0g N,N dimethylcyclohexylamine, then add 2.0g Span-80, and stir until Span80 is completely dissolved to form an oil phase;

[0050] S2) Dissolving 8.0 g of Tween-80 in deionized water to form an aqueous phase;

[0051] S3) Under stirring conditions, slowly add the oil phase into the water phase, so that the mass fraction of emulsifier A+emulsifier B in the system is 25%, forming an O / W emulsion;

[0052] S4) Pass CO into the emulsion 2 , the solvent N,N dimethylcyclohexylamine was dissolved in water and centrifuged to obtain SiO 2 @paraffin nanoparticles;

[0053] S5) The centrifuged supernatant was passed into N 2 , the supernatant is stratified into solvent and emulsifier aqueous solution, and the solvent and emulsifier aqueo...

Embodiment 2

[0058] The SiO with core-shell structure prepared in this example 2 @ Paraffin nanoparticles are prepared according to the following method: Paraffin and nano-SiO in step S1) 2 The mass ratio of the particles was adjusted to 9:1, 8:2, 7:3, and 6:4, and the products were prepared respectively to obtain the products. The preparation method was basically the same as that of Example 1, so no further details were given.

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Abstract

The invention relates to a SiO2@paraffin nano-particle with a core-shell structure and a preparation method thereof, and relates to the technical field of nanoparticles with core-shell structures. TheSiO2@paraffin nano-particle comprises nano SiO2 serving as a core and paraffin serving as a shell. The preparation method specifically comprises the following steps: S1) preparing an oil phase, S2) preparing a water phase, S3) preparing an O / W emulsion, S4) preparing SiO2@paraffin nanoparticles by introducing CO2 into the O / W emulsion, separating out paraffin, coating the paraffin on the surfaceof SiO2 to form SiO2-coated paraffin nanoparticles with core-shell structures, and centrifuging, and S5) carrying out cyclic utilization by introducing N2 into a protonation solvent to obtain an aqueous solution of N, N-dimethylcyclohexylamine and an emulsifier, and carrying out recycling. The preparation method of the SiO2@paraffin nanoparticles has the advantages of simple preparation method, cost saving, small environmental pollution and uniform particle size distribution of the product.

Description

[0001] The invention relates to the technical field of core-shell structure nanoparticles, in particular to a core-shell structure SiO2@paraffin nano-particle and a preparation method thereof. Background technique [0002] Due to oil and gas storage and rock-soil structures with nano-scale pore-throat structures, it is difficult to form a dense filter cake in the rock-soil structure by using conventional drilling fluid treatment agents to achieve a good effect of reducing fluid loss, especially Enable development for shale gas storage. [0003] nano-SiO 2 Because the surface is rich in hydroxyl groups, the relative area is large, the surface energy is high, and it is easy to agglomerate, so the surface is modified to improve the stability and dispersibility of the nano-powder. nano-SiO 2 Surface modification mainly includes outer film coating modification method, surface covering modification method, chemical grafting modification method, chemical precipitation modification ...

Claims

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Application Information

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IPC IPC(8): C08L91/06C08K3/36C08J3/12C09K8/46
CPCC08J3/12C09K8/46C08J2391/06C08K3/36C08K2201/011C08K2201/003
Inventor 郑存川扶浩然黄志宇张太亮王金玉吴洋
Owner SOUTHWEST PETROLEUM UNIV
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