Method for preparing polythene derivative in supercritical fluid

A technology of supercritical fluid and polyethylene, which is applied in the production of bulk chemicals to achieve the effects of reducing loss, reducing molecular weight distribution, and reducing production costs

Inactive Publication Date: 2008-02-13
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned preparation method of polyethylene derivatives, and provide a method for preparing polyethylene derivatives in a supercritical fluid with reasonable design, simple method, little environmental pollution and narrow molecular weight distribution

Method used

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  • Method for preparing polythene derivative in supercritical fluid
  • Method for preparing polythene derivative in supercritical fluid
  • Method for preparing polythene derivative in supercritical fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Taking the raw material trifluoroethyl methacrylate 10.214g (0.0608 mole) used for preparing polytrifluoroethyl methacrylate as an example, other raw materials used and the preparation process steps are as follows:

[0031] 1. Vacuumize the reactor

[0032] Charge CO into the reaction kettle 8 with a syringe pump 5 at room temperature 2 The pressure of the gas to the reactor 8 is 0.5MPa, release the charged gas, vacuumize the reactor 8 with a vacuum pump 1 to make the vacuum degree in the reactor 8 0.09MPa, repeat the above steps 2 times. It is also possible to fill the reactor with N 2 gas, Ar gas can also be filled, and N in the reactor can be filled 2 Or the pressure of Ar gas and the vacuum degree after the reactor is evacuated and filled with CO 2 Same for gas.

[0033] 2. Polymerization reaction

[0034] In this embodiment, the monomer is trifluoroethyl methacrylate, the free radical initiator is azobisisobutyronitrile, and the fluid is CO 2 . 10.214 g of t...

Embodiment 2

[0044] Taking the raw material trifluoroethyl methacrylate 10.214g (0.0608 mole) used for preparing polytrifluoroethyl methacrylate as an example, other raw materials used and the preparation process steps are as follows:

[0045] In polymerization step 2, trifluoroethyl methacrylate is selected as the monomer in this embodiment, azobisisobutyronitrile is selected as the free radical initiator, and CO is selected as the fluid. 2 . 10.214 g of trifluoroethyl methacrylate is added to the reaction kettle 8 with the metering pump 6, and the CO is charged into the reaction kettle 8 with the syringe pump 5 2 To the pressure in the reactor 8 is 6.9MPa, trifluoroethyl methacrylate and CO in the reactor 8 2 The volume of the fluid is 20%~30% of the volume of the reactor 8, and the reactor 8 is warmed up to 47.5°C with the heater 7, and 0.0099 g of azobisisobutyronitrile is added to the reactor 8 through the sample tube 4 and the syringe pump 5, The molar ratio of trifluoroethyl metha...

Embodiment 3

[0051] Taking the raw material trifluoroethyl methacrylate 10.214g (0.0608 mole) used for preparing polytrifluoroethyl methacrylate as an example, other raw materials used and the preparation process steps are as follows:

[0052] In polymerization step 2, trifluoroethyl methacrylate is selected as the monomer in this embodiment, azobisisobutyronitrile is selected as the free radical initiator, and CO is selected as the fluid. 2 . 10.214 g of trifluoroethyl methacrylate is added to the reactor 8 with the metering pump 6, and CO is charged into the reactor 8 with the syringe pump 5 until the pressure in the reactor 8 is 6.7 MPa, and the methacrylic acid in the reactor 8 is Trifluoroethyl ester and CO 2 The volume of the fluid is 20%~30% of the volume of the reactor 8, and the reactor 8 is warmed up to 70° C. with the heater 7, and 0.223 g of azobisisobutyronitrile is added to the reactor 8 through the sample tube 4 with the syringe pump 5, The molar ratio of trifluoroethyl me...

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Abstract

The utility model relates to a preparation method of polyethylene derivatives in supercritical fluid. The utility model consists of a polymerization reaction step and a purification step by means of a reaction axe 8, and a vacuum pump 1 used for vacuumizing. Compared with the existing preparation method of polyethylene derivatives in supercritical fluid, the utility model takes use of the vacuum pump 1 to vacuumize the reaction axe 8. And then monomer is added into the reaction axe 8. When the reaction axe 8 is heated to the reaction temperature, initiator is added into the reaction axe 8 for polymerization reaction. Through a large number of laboratory research, the experiment results indicate that the processing steps of the utility model reduces the loss of raw materials in the reaction process, the environmental pollution, as well as the polymer molecule distribution, enhances the yield rate of the polymerization reaction products and improves the performance of the products. The utility model also reduces the production cost. The utility model can be used for the preparation of polyethylene derivatives after the medium enlarging experiment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for preparing polyethylene derivatives in a supercritical fluid. Background technique [0002] Polyethylene derivatives refer to a class of polymer compounds obtained by polymerization of derivatives of vinyl monomers. Vinyl monomer derivatives mainly refer to oxygen-containing derivatives, nitrogen-containing derivatives and Fluorine-containing derivatives, the polymer materials obtained by polymerization of these monomers can be used as general materials, such as plastics, coatings, etc., and can also be used as functional materials in the fields of medicine, aerospace, machinery and microelectronics industries. [0003] Supercritical fluid refers to a fluid whose temperature and pressure are above the critical temperature and critical pressure, and supercritical carbon dioxide is its typical representative. The method of using supercritical carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F120/22
CPCY02P20/54
Inventor 刘昭铁陈建刚刘忠文
Owner SHAANXI NORMAL UNIV
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