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Chain transfer agent and preparation method and application thereof

A chain transfer agent and group technology, applied in the field of polymer material synthesis, can solve the problems of difficult regulation, poor solubility, wide molecular weight distribution, etc. Effect

Active Publication Date: 2019-10-08
青岛长兴高新科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of poor solubility of existing polymers, on the basis of ensuring viscosity increasing and shear recovery performance, it is proposed to prepare instant polymers with small molecular weight
Traditional free radical polymerization has limitations such as wide molecular weight distribution and difficulty in regulation

Method used

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  • Chain transfer agent and preparation method and application thereof
  • Chain transfer agent and preparation method and application thereof
  • Chain transfer agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 40mL of anhydrous THF and 0.1mol of bromoethylbenzene and mix them uniformly, then place them in a constant pressure dropping funnel to obtain a mixed solution, then take 0.105mol of magnesium strips and 0.2g of iodine in a conical flask, and drop them into the mixed solution under nitrogen protection. Solution 10mL, after the reaction, slowly add the remaining mixed solution dropwise, continue the reaction at 50°C for 2h after the dropwise addition, and add dropwise the solution containing 0.15molCS after cooling in an ice-water bath 2 35mL THF solution, after the dropwise addition, react at 50°C for 1h. Remove unreacted magnesium strips by filtration, distill off THF from the filtrate under reduced pressure, add 60 mL of ether and 40 mL of HCl with a content of 10%, take the upper organic liquid and dry it with anhydrous magnesium sulfate, and distill under reduced pressure to obtain red purple dithiocarboxylic acid, producing rate of 64%.

[0037] Finally, take...

Embodiment 2

[0039] A dithioester-type chain transfer agent grafted with α-cyclodextrin and benzene ring at the end is used to polymerize with the hydrophobic association monomer to obtain a hydrophobic association polymer containing α-cyclodextrin and benzene ring at both ends. The molecular weight is about 180,000. Dissolve 0.2 g of the polymer in 100 mL of water to prepare a polymer solution. The complete dissolution time is 1 h, and the viscosity is 205.7 mPa·s. Under the same conditions, the viscosity of conventional polyacrylamide with equal molecular weight is 80.3mPa·s. In contrast, the viscosity of the instant self-adhesive polymer system synthesized based on RAFT chain transfer agent increased by 156.2%. The viscosity recovers to 190.2mPa·s 1h after high-speed shearing, and the recovery rate can reach 92.3%.

Embodiment 3

[0041] The dithioester type chain transfer agent grafted with γ-cyclodextrin and anthracycline at the end is used to polymerize with polyacrylamide monomer to obtain polyacrylamide containing γ-cyclodextrin and anthracycline at both ends, with a molecular weight of about 130,000. 0.5 g of the polymer was dissolved in 100 mL of water to prepare a polymer solution, the complete dissolution time was 1.5 h, and the viscosity was 394.1 mPa·s. The viscosity of polyacrylamide with the same molecular weight is 189.9mPa·s, compared with that, the viscosity of the instant self-adhesive polymer system synthesized based on RAFT chain transfer agent is increased by 107.5%. The viscosity recovers to 369.7mPa·s after high-speed shearing for 1 hour, and the recovery rate can reach 93.8%.

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Abstract

The disclosure belongs to the field of polymer material synthesis, and in particular relates to a chain transfer agent and a preparation method and application thereof. A polymer has important applications in the field of oil and gas field development because of the viscosity-increasing ability of the polymer, but the polymer has relatively large molecular weight, poor solubility, and relatively poor shear resistance. A reversible addition-fragmentation chain transfer method can achieve precise regulation of a molecular weight of a polymer, and a reversible addition-fragmentation chain transfer agent is decomposed into two parts which are connected with terminal ends of a polymerization process reaction chain during a polymerization process. Based on the property, the skilled person is expected to use the host-guest inclusion action of a low molecular weight polymer to prepare a polymer with instant dissolution and self-viscosity-increasing effects. In view of the technical concept, the disclosure provides a reversible addition-fragmentation (RAFT) chain transfer agent containing a host group and a guest group at terminal ends, the chain transfer agent can significantly increase aviscosity of a polymer reaction system, a recovery degree after shearing is high, and viscosity-increasing properties are good.

Description

technical field [0001] The disclosure belongs to the field of polymer material synthesis, and in particular relates to a reversible addition-fragmentation (RAFT) chain transfer agent containing host and guest groups at the end, its preparation method and its application in the preparation of instant self-adhesive polymers. Background technique [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] In recent years, polymers have developed rapidly in fields such as oil and gas field development due to their good viscosity-increasing ability. However, due to its high molecular weight, the existing polymers have poor solubility and are prone to viscosity loss due to shearing during formation migratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/16C08F2/38C08F120/56
CPCC08B37/0012C08F2/38C08F120/56C08F2438/03
Inventor 张德文康万利杨红斌朱彤宇王鹏祥张向峰张弘文
Owner 青岛长兴高新科技发展有限公司
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