A kind of styrene-acrylic latex and its preparation method and application

A styrene-acrylic latex and seed technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as increasing the use cost, affecting the performance of cement slurry, increasing the difficulty of formula design, and reducing the difficulty and use cost. The effect of improving cementing quality and improving performance

Active Publication Date: 2020-02-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The polymer latex provided by the prior art needs to add soap emulsifiers and stabilizers to ensure the stability of the latex and cement slurry during use, which increases the difficulty of formula design, and the resulting formula error also affects the cement slurry. Various performances, and adding soap emulsifiers and stabilizers also increases the cost of use

Method used

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  • A kind of styrene-acrylic latex and its preparation method and application
  • A kind of styrene-acrylic latex and its preparation method and application
  • A kind of styrene-acrylic latex and its preparation method and application

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preparation example Construction

[0030] The preparation method of the above-mentioned styrene-acrylic latex provided in the embodiment of the present invention is to prepare the styrene-acrylic latex through two steps of seed emulsion polymerization and soap-free emulsion polymerization. The styrene-acrylic latex uses the seed emulsion polymerization part as the core, and the soap-free emulsion polymerization as the The shell, which can be evenly dispersed in the cement slurry and maintain a stable state with the cement particles, not only increases the fluidity of the cement slurry, but also hinders the growth of hydration product crystals during the cement hydration process, avoiding the expansion of the cement, Cracking and air channeling, so there is no need to add other soap emulsifiers and stabilizers to stabilize the system, which greatly reduces the difficulty of formula design and the cost of use. At the same time, the toughness and film-forming properties of the latex particles of the styrene-acrylic...

Embodiment 1

[0047]This embodiment provides a kind of styrene-acrylic latex, and this styrene-acrylic latex is prepared by the following method: 2.7g styrene monomer, 2.3g methyl methacrylate monomer, 0.075g sodium acrylate monomer, 0.01g sodium carbonate , 45g of deionized water was added to the reactor, then nitrogen gas was introduced, and the temperature was controlled to be 70°C, then 0.045 potassium persulfate was added, and the reaction was carried out for 90 minutes to obtain the seed emulsion polymerization part, and then 25g of methyl methacrylate was separately Body and 25g ethyl methacrylate monomer mixture, and the mixture of 0.27g potassium persulfate, 0.076g sodium carbonate, 0.58g2-acrylamido-2-methylpropanesulfonic acid monomer is added dropwise to the seed emulsion Polymerize the part, and control the dropping end point to reach at the same time, then raise the temperature to 82°C and keep it warm for 0.4h to obtain the styrene-acrylic latex provided in this example, and t...

Embodiment 2

[0049] This embodiment provides a kind of styrene-acrylic latex, and this styrene-acrylic latex is prepared by the following method: 2.7g styrene monomer, 2.3g ethyl acrylate, 0.075g maleic acid monomer, 0.01g sodium carbonate, 45g Ionized water was added to the reactor, then nitrogen gas was introduced, and the temperature was controlled at 72°C, then 0.045g of ammonium persulfate was added, and the reaction was carried out for 92min to obtain the seed emulsion polymerization part, and then 30g of methyl methacrylate monomer and A mixture of 15g ethyl methacrylate monomer, and a mixture of 0.27g ammonium persulfate, 0.077g sodium phosphate, and 0.86g 2-acrylamido-2-methylpropanesulfonic acid monomer are simultaneously added dropwise to the seed emulsion polymerization part , and control the dropping end point to reach at the same time, then raise the temperature to 88°C and keep it warm for 0.5h to obtain the styrene-acrylic latex provided in this example, and the average part...

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Abstract

The invention discloses a styrene-acrylic latex and its preparation method and application, belonging to the field of well cementing materials. The preparation method of this styrene-acrylic latex is, seed emulsion polymerization: styrene, acrylate, unsaturated acid or its salt, buffering agent, deionized water are added in the reactor, pass into nitrogen, add initiator, at 60 React at ℃-88℃ for 80-100min to obtain the seed emulsion polymerization part, and then separately add acrylates, and a mixture composed of initiator, buffer, unsaturated acid or its salts into the reactor at the same time, At the same time, the drops are completed, and the temperature is kept at 80°C-90°C to obtain styrene-acrylic latex. In the monomers of seed emulsion polymerization, styrene accounts for 14%-75%, and acrylates account for 24%-85%; in the monomers of soap-free emulsion polymerization, acrylates account for 92%-99%; seed emulsion The percentage of the polymerized portion to the total polymer is 5%-25%. The preparation method has simple process and short time consumption, and the prepared styrene-acrylic latex has good stability and can greatly improve various properties of cement slurry.

Description

technical field [0001] The invention relates to the field of well cementing materials, in particular to a styrene-acrylic latex and its preparation method and application. Background technique [0002] Cement slurry is widely used in oil and gas well cementing, construction, mining and other fields. For example, in the field of oil and gas well cementing, flowing cement slurry can be poured into the space between the oil well steel pipe and the formation well wall, and after the cement slurry is cemented and fixed, a circular column that seals the oil well steel pipe and the formation well wall can be formed , can play the role of fixing and protecting oil well steel pipes, and isolating different layers under oil and gas wells, so as to maintain the normal exploitation of oil and gas wells. However, the rheology of the cement slurry, the stability of the slurry, the ability to prevent gas channeling, and the mechanical properties of the hardened cement cannot meet the need...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F212/08C08F220/14C08F220/18C08F220/58C08F222/08C08F2/44C08F2/22C09K8/467
CPCC09K8/467C08F2/22C08F2/44C08F220/06C08F212/08C08F220/14C08F220/18C08F220/585C08F222/08C08F220/1802
Inventor 焦利宾郭建华郑友志佘朝毅马辉运桑宇王福云杨涛陈大钧
Owner PETROCHINA CO LTD
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