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A kind of ethylene-tetrafluoroethylene copolymer and preparation method thereof

A technology of tetrafluoroethylene and copolymer, which is applied in the field of ethylene-tetrafluoroethylene copolymer and its preparation, can solve the problem of not mentioning the adhesion of metal substrates, reducing the corrosion resistance and thermal stability of ETFE, and the lack of physical affinity. To achieve excellent thermal stability and corrosion resistance, short polymerization time and uniform composition

Active Publication Date: 2021-01-08
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102037033A has reported that the surface characteristics of ETFE are improved by adding (meth)acrylic acid esters as the third monomer in ETFE, and is used to treat the substrate, and does not mention the adhesion with the metal substrate, on the other hand ( Meth)acrylates are inherently reactive and, due to the lack of physical affinity for the domains of fluoroolefin monomers, tend to react with themselves rather than with fluoroolefin monomers, so in the polymer chain It is easy to form a multi-unit (≥2) sequence structure of (meth)acrylate monomers, thereby reducing the corrosion resistance and thermal stability of ETFE

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Use a 10L vertical stainless steel polymerization kettle with stirring equipment, fill with nitrogen and vacuumize three times, add 7L of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, 7g of mercapto Ethanol and 50g fluorinated glycidyl methacrylate, start stirring, the stirring speed is 500rpm, fill the mixed gas of tetrafluoroethylene and ethylene with a molar percentage of 80:20, until the pressure of the polymerization tank is 1.5MPa, and the polymerization temperature is 80°C . Use an auxiliary pump to add 0.7g of initiator tert-butyl peroxide pivalate. After the polymerization reaction starts, add a mixed gas of tetrafluoroethylene and ethylene with a tetrafluoroethylene content of 53mol%. When the polymerization reaction takes 60 minutes, add 10g of fluorinated pivalate. Glycidyl methacrylate, the polymerization reaction ends after 120 minutes, the temperature is lowered, the pressure is lowered, the material is discharged, the solvent is recovered by evapor...

Embodiment 2

[0044] Use a 10L vertical stainless steel polymerization kettle with stirring equipment, fill with nitrogen and vacuumize three times, add 7L of perfluoromethylcyclohexane, 14g of cyclohexane and 150g of fluorinated glycidyl methacrylate, start stirring, and stir The rotational speed is 700rpm, and the mixed gas of tetrafluoroethylene and ethylene with a molar percentage of 90:10 is filled until the pressure of the polymerization tank is 2.0MPa, and the polymerization temperature is 60°C. Add 7g of initiator peroxydicarbonate bis(2-ethylhexyl) with an auxiliary pump, add tetrafluoroethylene and ethylene mixed gas with a tetrafluoroethylene content of 53mol% after the polymerization reaction starts, and add it when the polymerization reaction is 120min 35g fluorinated glycidyl methacrylate, the polymerization reaction ends after 240min, cooling, depressurization, blowing, evaporation recovery solvent, drying, pulverization, obtain copolymer (hereinafter referred to as " ETFE2 ")...

Embodiment 3

[0047] Use a 10L vertical stainless steel polymerization kettle with stirring equipment, fill with nitrogen and vacuumize three times, add 7.5L of 1,1,2,2-tetrafluoroethyl ethyl ether, 11g of ethanol and 80g of fluorinated methacrylic acid to shrink Glyceride, start stirring, the stirring speed is 600rpm, fill the mixed gas of tetrafluoroethylene and ethylene with a molar percentage of 85:15, until the pressure of the polymerization tank is 1.8MPa, and the polymerization temperature is 65°C. Use an auxiliary pump to add 3g of initiator diisopropyl peroxydicarbonate. After the polymerization reaction starts, add a mixed gas of tetrafluoroethylene and ethylene with a tetrafluoroethylene content of 53mol%. When the polymerization reaction takes 90 minutes, add 30g of methyl fluoride Glycidyl acrylate, the polymerization reaction ends after 180 minutes, the temperature is lowered, the pressure is lowered, the material is discharged, the solvent is recovered by evaporation, dried, a...

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Abstract

The invention discloses an ethylene-tetrafluoroethylene copolymer and a preparation method thereof. Polymerization is carried out by adopting a solution precipitation polymerization method, and polymerization monomers are tetrafluoroethylene monomers, ethylene monomers and third modification monomers, wherein the third modification monomers are fluorinated glycidyl methacrylate and are added intothe polymerization system by two times. The molar ratio of the tetrafluoroethylene monomers to the ethylene monomers to the third modification monomers is (80-90 mol%):(10-20 mol%):(1-2 mol%). The copolymer obtained by the method is uniform in composition and excellent in performance, and adhesion performance and levelling performance are greatly improved; moreover, excellent thermal stability andcorrosion resistance are achieved, the adhesion performance and levelling performance are greatly improved, and the copolymer is applied to the field of electrostatic spraying. The method provided bythe invention is short in polymerization time, the fluorine-containing solvent is clean and environmentally friendly, operation is safe and simple, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the field of fluorine-containing polymers, in particular to an ethylene-tetrafluoroethylene copolymer and a preparation method thereof. Background technique [0002] Ethylene-tetrafluoroethylene copolymer (hereinafter, ethylene is also called E, tetrafluoroethylene is called TFE, and ethylene-tetrafluoroethylene copolymer is called ETFE) has excellent chemical resistance (chemical resistance), heat resistance Non-adhesive, good electrical properties (insulation), formability (heat extrusion, injection molding, roll coating, and electrostatic spraying). Electrostatic spraying is a molding method in which resin powder is sprayed onto the substrate with an electrostatic spray gun under high voltage, and then heated and baked to form a coating on the surface of the substrate. Due to its good processing performance, ETFE is sprayed on the inner wall of equipment and pipelines by electrostatic spraying process to make anti-corrosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F210/02C08F220/32C08F2/00C09D127/18C09D5/08C09D7/20
Inventor 孙倍佳陈振华赵洁郑侠俊
Owner JUHUA GROUP TECH CENT