A kind of preparation method of graphene aqueous dispersion liquid
A technology of dispersion and graphene, applied in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve problems such as the limitation of graphene dispersion stability, and achieve the goal of improving anti-corrosion performance, improving dispersion stability and improving dispersibility. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0022] The embodiment of the present invention provides a kind of preparation method of graphene aqueous dispersion liquid, comprising:
[0023] S1: disperse graphene in N-vinylpyrrolidone monomer, stir to make it uniformly dispersed, and obtain graphene-N-vinylpyrrolidone dispersion liquid.
[0024] In this step, in order to overcome the agglomeration phenomenon among graphene nanoparticles, vinylpyrrolidone molecules with a nitrogen heterocyclic structure are introduced, which can be combined with graphene sheets through intermolecular interactions. Its structure and properties are similar to the commonly used graphene dispersant (N-methylpyrrolidone), and both have good dispersing ability. The difference is that the methyl group in N-methylpyrrolidone is replaced by a vinyl group, which gives it the ability to further react while maintaining good dispersion.
[0025] S2: Add the dispersion into water, stir to disperse, and obtain a graphene-N-vinylpyrrolidone-water dispers...
Embodiment 1
[0038] Preparation of graphene aqueous dispersion
[0039] (1) disperse a certain amount of graphene in the N-vinylpyrrolidone monomer, wherein the mass concentration of graphene is between 1% and 30%, to obtain a graphene-N-vinylpyrrolidone dispersion;
[0040] (2) adding the dispersion into water, controlling the graphene mass concentration between 0.5% and 15%, and stirring to disperse it to obtain a graphene-N-vinylpyrrolidone-water dispersion;
[0041] (3) In the stirring process, add monomer mass 0.5%~2% initiator and monomer mass 0.05%~2% crosslinking agent in the graphene-N-vinylpyrrolidone-water dispersion liquid, heat up Make it polymerize at 50° C. to 90° C., react for 0.5 hours to 5 hours, and obtain a graphene aqueous dispersion after cooling.
Embodiment 2
[0043] Dispersibility Characterization of Graphene Aqueous Dispersion
[0044] Dynamic light scattering instrument, model: Zetasizer Nano S90, instrument manufacturer: Malvern Company, UK, emission angle 178 degrees, experiment temperature 25°C.
[0045] In this embodiment, a dynamic light scattering instrument is used to observe the dispersion of graphene. Specifically, the sample is added to a cuvette with an optical path of 1 cm, and the test is carried out after 5 minutes of heat preservation, and the average value of 5 experiments is taken for analysis.
[0046] The test results show that when graphene is directly dispersed in water, due to the large surface area of graphene and the weak affinity with water, agglomeration occurs, which can be seen from the data of dynamic light scattering ( figure 1 ) It can be seen that the particle size range at this time is about 700 nanometers. For the graphene aqueous dispersion prepared by the method provided by the embodiments o...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More