Method for preparing sodium polystyrenesulfonate/multi-wall carbon nanotube composition

A technology of sodium polystyrene sulfonate and multi-walled carbon nanotubes, applied in the field of material chemistry, can solve the problems of limiting the use of nanomaterials, inability to play the role of nanomaterials, flocculation and sedimentation of nanomaterials, etc., and achieve the goal of improving long-term stable dispersion performance Effect

Inactive Publication Date: 2018-03-06
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The presence of a small amount of electrolyte will lead to flocculation and sedimentation of nanomaterials, which cannot play the role of nanomaterials
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  • Method for preparing sodium polystyrenesulfonate/multi-wall carbon nanotube composition
  • Method for preparing sodium polystyrenesulfonate/multi-wall carbon nanotube composition
  • Method for preparing sodium polystyrenesulfonate/multi-wall carbon nanotube composition

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[0020] In the present invention, sodium polystyrene sulfonate is covalently grafted on the surface of multi-walled carbon nanotubes by means of in-situ polymerization, and the polymer chains grafted on the surface of nanotubes undergo solvation and stretch out in water to form nanotubes The dispersion of the space plays the role of space repulsion. At the same time, the polymer chains contain a large number of negative charges, which provide electrostatic repulsion for the dispersion of nanotubes in water. The strong electrostatic repulsion and steric repulsion inhibit the electric double layer compression of the nanotube surface by the electrolyte in the salt solution, so that the multi-walled carbon nanotubes can be stably dispersed at high salt concentration (15% NaCl) for up to 30 days . In addition, it is also possible to make nanotubes in API brine (8wt% NaCl + 2wt% CaCl 2 ) in stable dispersion for up to 30 days. The good dispersion and long-term stability of the PSS...

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Abstract

The invention discloses a method for preparing a sodium polystyrenesulfonate/multi-wall carbon nanotube (PSS/MWNTs) composition. The method comprises the following steps: putting 50mg of multi-wall carbon nanotubes into 60mL of deionized water, performing ultrasonic dispersion, adding 5g of sodium p-styrenesulfonate, stirring for 8 hours at normal temperature, adding 50mg of potassium peroxodisulfate, stirring for 48 hours at 65 DEG C in the presence of argon, and after the stirring is completed, performing centrifugation treatment to remove irregular carbon and a catalyst; and filtering supernate by using a filtering membrane of 0.2mu m, removing ungrafted sodium polystyrenesulfonate (PSS), and performing freeze-drying on the obtained solid, thereby obtaining the PSS/MWNTs composition. According to the method, the surfaces of MWNTs are coated by PSS in a covalence manner through in-situ polymerization, a great amount of negative charges are introduced to the surfaces of the nanotubes,a spatial expelling function is achieved, stable dispersion of the nanotubes in high-concentration saline water and API (American Petroleum Association) saline water is achieved. By adopting the method, a base is made for application of the multi-wall carbon nanotubes in the petroleum industry.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a sodium polystyrene sulfonate / multi-wall carbon nanotube compound and a preparation method thereof. Background technique [0002] At present, the research on the application of nanomaterials in oil and gas field development has attracted much attention. Multi-walled carbon nanotubes, as one-dimensional nanomaterials, are used in different fields such as nano-sealing and nano-flooding. Carbon atoms in carbon nanotubes are represented by sp 2 Hybridization is dominant, while the hexagonal grid structure has a certain degree of bending, forming a spatial topology, in which a certain sp 3 Hybrid bond, that is, the chemical bond formed also has sp 2 and sp 3 mixed hybrid state. When the multi-walled tube begins to form, the layers between the layers are easy to become trap centers to capture various defects, so the tube wall of the multi-walled tube is usu...

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Application Information

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IPC IPC(8): C08F292/00C08F212/14
CPCC08F292/00C08F212/14
Inventor 何毅马兰罗平亚卿大咏张李云陈春林钟菲石恒
Owner SOUTHWEST PETROLEUM UNIV
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