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Data for: Preparation and performance evaluation of latex

Citation

Guo, Shenglai et al. (2022), Data for: Preparation and performance evaluation of latex , Dryad, Dataset, https://doi.org/10.5061/dryad.bzkh189d2

Abstract

To prevent considerable foaming of the latex cement slurry, soap-free emulsion polymerization was employed to prepare latex, which did not require a stabilizer to achieve good stability of the latex. In addition, effects of the AMPS addition, monomer ratio, synthesis temperature, and stirring speed on the performance of the latex were investigated by using AMPS, styrene, and butyl acrylate as the reaction monomers, and the latex was characterized by infrared spectroscopy and TEM.

The stability of latex was significantly affected by AMPS addition, with good stability at an AMPS content of greater than 30%. With the increase in the addition amount of AMPS, the fluid loss of the cement slurry decreased and then increased; it was the lowest at 40% AMPS, with a loss of 27.32 mL. The analysis suggested that this result may be attributed to the effect of the AMPS addition on the particle size of the latex, resulting in a change in the fluid loss of the cement slurry.

With the increase in the mass ratio of St:BA, the fluid loss of the cement slurry first decreased and then increased, reaching an optimum value at a St:BA mass ratio of 5:4, where the fluid loss was only 18.98 mL. This result indicated that a reasonable ratio of hard and soft monomers helps to ensure that the latex exhibits an ability to control fluid loss.

With the increase in the synthesis temperature, the fluid loss of the cement slurry decreased first and then increased, and the fluid loss of the cement slurry was the lowest in the temperature range of 75–85℃. The synthesis temperature also mainly affected the particle size of latex as well as the fluid loss of the cement slurry.

With the increase in the mixing speed, the fluid loss of the cement slurry increased first and then decreased, and the fluid loss of cement slurry was the lowest at a mixing speed of 400 r·min-1.

BSA latex exhibited good stability after seven freeze-thaw cycles between -20°C and 20°C.

BSA latex did not cause foaming issues in the prepared latex cement slurry.

Methods

There are three main method types:

(1) Latex particle size test: First, latex and deionized water were evenly mixed at a mass ratio of 1:50, and the mixed liquid was absorbed using a rubber dropper into the sample tube, and the top cover of the sample tube was covered. The particle size was analyzed by using a Brookhaven Zeta Potential and Laser Particle Size Analyzer 90Plus Zeta instrument. Each sample was tested in triplicate, and the average value was taken as the particle size of the sample.

(2) Fluid loss test of cement slurry: The cement slurry was prepared using a waring blender according to the American Petroleum Institute (API) standards. First, latex was added to water, followed by the addition of the class G oil well cement and mixing using a constant speed mixer at a low speed for 15 s and then at high speed for 35 s. Second, the mixed cement slurry was poured into a cement slurry filter press and sealed, and the pressure was set to 6.9 MPa. The fluid loss over 30 min was observed. 

(3) First, a certain amount of latex BSA was weighed and added into a test tube, followed by the addition of an appropriate amount of anhydrous ethanol and shaking to break the formed emulsion. Second, a certain amount of acetone was added into the solution after breaking the emulsion, followed by high-speed centrifugation and pouring of the supernatant in the test tube. Next, the above steps were repeated thrice, followed by the replacement of acetone with distilled water and repetition of the above steps thrice to completely wash the unpolymerized monomers from the product. Finally, the finished material was placed in an oven for drying at low temperatures. After there was no change in the sample quality, it was removed from the oven and ground into a powder using an agate mortar. Absorption spectra were recorded in the range of 4000–400 cm-1. by using a USA Thermo Fisher Nicolet IS50 Fourier transform IR spectrometer .

Then, by these three methods, the effects of different AMPS addition, monomer ratio, reaction temperature and mixing speed on the particle size of the synthesized latex and water loss of cement slurry were investigated, and finally the relevant data were measured to obtain the dataset.

Usage Notes

Please see the README document ("README_Dataset-Preparation and Performance Evaluation of Latex.txt").

 

Funding

Natural Science Foundation of China, Award: 51704321