DOI: 10.5061/dryad.bzkh189d2
title: Data for: Preparation and performance evaluation of latex

description: 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.
description: 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<sup>-1</sup>. 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.
description: Please see the README document
 ("README_Dataset-Preparation and Performance Evaluation of
 Latex.txt").