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Styrene and acrylate latex and preparation method and application thereof

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

Active Publication Date: 2018-03-09
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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  • Styrene and acrylate latex and preparation method and application thereof
  • Styrene and acrylate latex and preparation method and application thereof
  • Styrene and acrylate latex and preparation method and application thereof

Examples

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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, and prevents the cement from expanding, 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-acryl...

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 styrene and acrylate latex and a preparation method and application thereof, and belongs to the field of well cementing materials. The preparation method of the styrene and acrylate latex comprises the following steps of polymerizing of seed emulsion: adding styrene, acrylate, unsaturated acid or salt thereof, a buffer agent, and deionized water into a reactor, leading nitrogen gas, adding an initiator, and reacting for 80 to 100min at the temperature of 60 to 88 DEG C, so as to obtain the seed emulsion polymerizing part; singly dripping the acrylate, and the mixture ofthe initiator, the buffer agent, and the unsaturated acid or salt thereof into a reactor, simultaneously finishing dripping, and warming at the temperature of 80 to 90 DEG C, so as to obtain the styrene and acrylate latex. The seed emulsion polymerizing monomer contains 14% to 75% of styrene and 24% to 85% of acrylate; the soap-free emulsion polymerizing monomer contains 92% to 99% of acrylate; the percentage of the seed emulsion polymerizing part in the total polymer is 5% to 25%. The preparation method has the advantages that the technology is simple, the consumption time is short, the prepared styrene and acrylate latex has good stability, and the properties of cement mortar are greatly improved.

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 Applications(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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